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map: fix wrong use of map.cap and rename field (#7412)

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Nick Treleaven 2020-12-21 04:34:35 +00:00 committed by GitHub
parent 75903052a8
commit 82d1b6a5b7
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1 changed files with 26 additions and 19 deletions
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45
vlib/builtin/map.v
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@ -68,7 +68,7 @@ const (
// Maximum load-factor (len / capacity)
max_load_factor = 0.8
// Initial highest even index in metas
init_cap = init_capicity - 2
init_even_index = init_capicity - 2
// Used for incrementing `extra_metas` when max
// probe count is too high, to avoid overflow
extra_metas_inc = 4
@ -208,7 +208,7 @@ pub struct map {
value_bytes int
mut:
// Highest even index in the hashtable
cap u32
even_index u32
// Number of cached hashbits left for rehasing
cached_hashbits byte
// Used for right-shifting out used hashbits
@ -233,7 +233,7 @@ fn new_map_1(value_bytes int) map {
return map{
key_bytes: key_bytes
value_bytes: value_bytes
cap: init_cap
even_index: init_even_index
cached_hashbits: max_cached_hashbits
shift: init_log_capicity
key_values: new_dense_array(key_bytes, value_bytes)
@ -261,7 +261,7 @@ fn (m &map) keys_eq(a voidptr, b voidptr) bool {
fn (m &map) key_to_index(pkey voidptr) (u32, u32) {
key := *&string(pkey)
hash := hash.wyhash_c(key.str, u64(key.len), 0)
index := hash & m.cap
index := hash & m.even_index
meta := ((hash >> m.shift) & hash_mask) | probe_inc
return u32(index), u32(meta)
}
@ -312,7 +312,7 @@ fn (mut m map) meta_greater(_index u32, _metas u32, kvi u32) {
fn (mut m map) ensure_extra_metas(probe_count u32) {
if (probe_count << 1) == m.extra_metas {
m.extra_metas += extra_metas_inc
mem_size := (m.cap + 2 + m.extra_metas)
mem_size := (m.even_index + 2 + m.extra_metas)
unsafe {
x := v_realloc(byteptr(m.metas), int(sizeof(u32) * mem_size))
m.metas = &u32(x)
@ -334,7 +334,7 @@ fn (mut m map) set(key string, value voidptr) {
// not equivalent to the key of any other element already in the container.
// If the key already exists, its value is changed to the value of the new element.
fn (mut m map) set_1(key voidptr, value voidptr) {
load_factor := f32(m.len << 1) / f32(m.cap)
load_factor := f32(m.len << 1) / f32(m.even_index)
if load_factor > max_load_factor {
m.expand()
}
@ -361,8 +361,8 @@ fn (mut m map) set_1(key voidptr, value voidptr) {
// Doubles the size of the hashmap
fn (mut m map) expand() {
old_cap := m.cap
m.cap = ((m.cap + 2) << 1) - 2
old_cap := m.even_index
m.even_index = ((m.even_index + 2) << 1) - 2
// Check if any hashbits are left
if m.cached_hashbits == 0 {
m.shift += max_cached_hashbits
@ -380,7 +380,7 @@ fn (mut m map) expand() {
// Rehashes are performed when the load_factor is going to surpass
// the max_load_factor in an operation.
fn (mut m map) rehash() {
meta_bytes := sizeof(u32) * (m.cap + 2 + m.extra_metas)
meta_bytes := sizeof(u32) * (m.even_index + 2 + m.extra_metas)
unsafe {
x := v_realloc(byteptr(m.metas), int(meta_bytes))
m.metas = &u32(x)
@ -401,7 +401,7 @@ fn (mut m map) rehash() {
// key completely, it uses the bits cached in `metas`.
fn (mut m map) cached_rehash(old_cap u32) {
old_metas := m.metas
metasize := int(sizeof(u32) * (m.cap + 2 + m.extra_metas))
metasize := int(sizeof(u32) * (m.even_index + 2 + m.extra_metas))
m.metas = &u32(vcalloc(metasize))
old_extra_metas := m.extra_metas
for i := u32(0); i <= old_cap + old_extra_metas; i += 2 {
@ -410,8 +410,8 @@ fn (mut m map) cached_rehash(old_cap u32) {
}
old_meta := unsafe {old_metas[i]}
old_probe_count := ((old_meta >> hashbits) - 1) << 1
old_index := (i - old_probe_count) & (m.cap >> 1)
mut index := (old_index | (old_meta << m.shift)) & m.cap
old_index := (i - old_probe_count) & (m.even_index >> 1)
mut index := (old_index | (old_meta << m.shift)) & m.even_index
mut meta := (old_meta & hash_mask) | probe_inc
index, meta = m.meta_less(index, meta)
kv_index := unsafe {old_metas[i + 1]}
@ -501,6 +501,17 @@ fn (m &map) exists_1(key voidptr) bool {
return false
}
[inline]
fn (mut d DenseArray) delete(i int) {
if d.deletes == 0 {
d.all_deleted = vcalloc(d.cap) // sets to 0
}
d.deletes++
unsafe {
d.all_deleted[i] = 1
}
}
pub fn (mut m map) delete(key string) {
m.delete_1(&key)
}
@ -522,12 +533,8 @@ pub fn (mut m map) delete_1(key voidptr) {
index += 2
}
m.len--
if m.key_values.deletes == 0 {
m.key_values.all_deleted = C.calloc(1, m.cap) // sets to 0
}
m.key_values.deletes++
m.key_values.delete(kv_index)
unsafe {
m.key_values.all_deleted[kv_index] = 1
m.metas[index] = 0
m.free_key(pkey)
// Mark key as deleted
@ -616,11 +623,11 @@ pub fn (d &DenseArray) clone() DenseArray {
[unsafe]
pub fn (m &map) clone() map {
metasize := int(sizeof(u32) * (m.cap + 2 + m.extra_metas))
metasize := int(sizeof(u32) * (m.even_index + 2 + m.extra_metas))
res := map{
key_bytes: m.key_bytes
value_bytes: m.value_bytes
cap: m.cap
even_index: m.even_index
cached_hashbits: m.cached_hashbits
shift: m.shift
key_values: unsafe {m.key_values.clone()}