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Implement dumb PtrMap

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gingerBill
2024-04-26 15:04:46 +01:00
parent c685b404ea
commit 2b26384b89
4 changed files with 245 additions and 262 deletions
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455
src/ptr_map.cpp
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@@ -16,23 +16,21 @@ struct MapFindResult {
};
enum : MapIndex { MAP_SENTINEL = ~(MapIndex)0 };
static void *const MAP_TOMBSTONE = (void *)~(uintptr)0;
template <typename K, typename V>
struct PtrMapEntry {
static_assert(sizeof(K) == sizeof(void *), "Key size must be pointer size");
K key;
V value;
MapIndex next;
K key;
V value;
};
template <typename K, typename V>
struct PtrMap {
MapIndex * hashes;
usize hashes_count;
PtrMapEntry<K, V> *entries;
u32 count;
u32 entries_capacity;
u32 capacity;
};
@@ -69,7 +67,6 @@ template <typename K, typename V> gb_internal void map_grow (PtrMap<
template <typename K, typename V> gb_internal void map_rehash (PtrMap<K, V> *h, isize new_count);
template <typename K, typename V> gb_internal void map_reserve (PtrMap<K, V> *h, isize cap);
#if PTR_MAP_ENABLE_MULTI_MAP
// Mutlivalued map procedure
template <typename K, typename V> gb_internal PtrMapEntry<K, V> * multi_map_find_first(PtrMap<K, V> *h, K key);
template <typename K, typename V> gb_internal PtrMapEntry<K, V> * multi_map_find_next (PtrMap<K, V> *h, PtrMapEntry<K, V> *e);
@@ -79,7 +76,6 @@ template <typename K, typename V> gb_internal void multi_map_get_all (PtrMap<
template <typename K, typename V> gb_internal void multi_map_insert (PtrMap<K, V> *h, K key, V const &value);
template <typename K, typename V> gb_internal void multi_map_remove (PtrMap<K, V> *h, K key, PtrMapEntry<K, V> *e);
template <typename K, typename V> gb_internal void multi_map_remove_all(PtrMap<K, V> *h, K key);
#endif
gb_internal gbAllocator map_allocator(void) {
return heap_allocator();
@@ -94,170 +90,141 @@ gb_internal gb_inline void map_init(PtrMap<K, V> *h, isize capacity) {
template <typename K, typename V>
gb_internal gb_inline void map_destroy(PtrMap<K, V> *h) {
gbAllocator a = map_allocator();
gb_free(a, h->hashes);
gb_free(a, h->entries);
}
template <typename K, typename V>
gb_internal void map__resize_hashes(PtrMap<K, V> *h, usize count) {
h->hashes_count = cast(u32)resize_array_raw(&h->hashes, map_allocator(), h->hashes_count, count, MAP_CACHE_LINE_SIZE);
}
template <typename K, typename V>
gb_internal void map__reserve_entries(PtrMap<K, V> *h, usize capacity) {
h->entries_capacity = cast(u32)resize_array_raw(&h->entries, map_allocator(), h->entries_capacity, capacity, MAP_CACHE_LINE_SIZE);
}
template <typename K, typename V>
gb_internal MapIndex map__add_entry(PtrMap<K, V> *h, K key) {
PtrMapEntry<K, V> e = {};
e.key = key;
e.next = MAP_SENTINEL;
if (h->count+1 >= h->entries_capacity) {
map__reserve_entries(h, gb_max(h->entries_capacity*2, 4));
}
h->entries[h->count++] = e;
return cast(MapIndex)(h->count-1);
}
template <typename K, typename V>
gb_internal MapFindResult map__find(PtrMap<K, V> *h, K key) {
MapFindResult fr = {MAP_SENTINEL, MAP_SENTINEL, MAP_SENTINEL};
if (h->hashes_count == 0) {
return fr;
gb_internal void map__insert(PtrMap<K, V> *h, K key, V const &value) {
if (h->count+1 >= h->capacity) {
map_grow(h);
}
u32 hash = ptr_map_hash_key(key);
fr.hash_index = cast(MapIndex)(hash & (h->hashes_count-1));
fr.entry_index = h->hashes[fr.hash_index];
while (fr.entry_index != MAP_SENTINEL) {
auto *entry = &h->entries[fr.entry_index];
if (entry->key == key) {
return fr;
u32 mask = h->capacity-1;
MapIndex index = hash & mask;
MapIndex original_index = index;
do {
auto *entry = h->entries+index;
if (!entry->key || entry->key == cast(K)MAP_TOMBSTONE) {
entry->key = key;
entry->value = value;
h->count += 1;
return;
}
fr.entry_prev = fr.entry_index;
fr.entry_index = entry->next;
}
return fr;
}
index = (index+1)&mask;
} while (index != original_index);
template <typename K, typename V>
gb_internal MapFindResult map__find_from_entry(PtrMap<K, V> *h, PtrMapEntry<K, V> *e) {
MapFindResult fr = {MAP_SENTINEL, MAP_SENTINEL, MAP_SENTINEL};
if (h->hashes_count == 0) {
return fr;
}
u32 hash = ptr_map_hash_key(e->key);
fr.hash_index = cast(MapIndex)(hash & (h->hashes_count-1));
fr.entry_index = h->hashes[fr.hash_index];
while (fr.entry_index != MAP_SENTINEL) {
if (&h->entries[fr.entry_index] == e) {
return fr;
}
fr.entry_prev = fr.entry_index;
fr.entry_index = h->entries[fr.entry_index].next;
}
return fr;
GB_PANIC("FAILED TO INSERT");
}
template <typename K, typename V>
gb_internal b32 map__full(PtrMap<K, V> *h) {
return 0.75f * h->hashes_count <= h->count;
return 0.75f * h->capacity <= h->count;
}
template <typename K, typename V>
gb_internal gb_inline void map_grow(PtrMap<K, V> *h) {
isize new_count = gb_max(h->hashes_count<<1, 16);
map_rehash(h, new_count);
isize new_capacity = gb_max(h->capacity<<1, 16);
map_reserve(h, new_capacity);
}
template <typename K, typename V>
gb_internal void map_reset_entries(PtrMap<K, V> *h) {
for (usize i = 0; i < h->hashes_count; i++) {
h->hashes[i] = MAP_SENTINEL;
}
for (usize i = 0; i < h->count; i++) {
MapFindResult fr;
PtrMapEntry<K, V> *e = &h->entries[i];
e->next = MAP_SENTINEL;
fr = map__find_from_entry(h, e);
if (fr.entry_prev == MAP_SENTINEL) {
h->hashes[fr.hash_index] = cast(MapIndex)i;
} else {
h->entries[fr.entry_prev].next = cast(MapIndex)i;
}
gb_internal void try_map_grow(PtrMap<K, V> *h) {
if (h->capacity == 0 || map__full(h)) {
map_grow(h);
}
}
template <typename K, typename V>
gb_internal void map_reserve(PtrMap<K, V> *h, isize cap) {
if (h->count*2 < h->hashes_count) {
if (cap < h->capacity) {
return;
}
map__reserve_entries(h, cap);
map__resize_hashes(h, cap*2);
map_reset_entries(h);
}
cap = next_pow2_isize(cap);
typedef PtrMapEntry<K, V> EntryType;
PtrMap<K, V> new_h = {};
new_h.count = 0;
new_h.capacity = cast(u32)cap;
new_h.entries = gb_alloc_array(string_map_allocator(), EntryType, new_h.capacity);
template <typename K, typename V>
gb_internal void map_rehash(PtrMap<K, V> *h, isize new_count) {
map_reserve(h, new_count);
if (h->count) {
for (u32 i = 0; i < h->capacity; i++) {
auto *entry = h->entries+i;
if (entry->key &&
entry->key != cast(K)MAP_TOMBSTONE) {
map__insert(&new_h, entry->key, entry->value);
}
}
}
map_destroy(h);
*h = new_h;
}
template <typename K, typename V>
gb_internal V *map_get(PtrMap<K, V> *h, K key) {
MapIndex hash_index = MAP_SENTINEL;
MapIndex entry_prev = MAP_SENTINEL;
MapIndex entry_index = MAP_SENTINEL;
if (h->hashes_count != 0) {
u32 hash = ptr_map_hash_key(key);
hash_index = cast(MapIndex)(hash & (h->hashes_count-1));
entry_index = h->hashes[hash_index];
while (entry_index != MAP_SENTINEL) {
auto *entry = &h->entries[entry_index];
if (entry->key == key) {
return &entry->value;
}
entry_prev = entry_index;
entry_index = entry->next;
}
if (h->count == 0) {
return nullptr;
}
if (key == 0) {
GB_PANIC("0 key");
}
u32 hash = ptr_map_hash_key(key);
u32 mask = (h->capacity-1);
u32 index = hash & mask;
u32 original_index = index;
do {
auto *entry = h->entries+index;
if (!entry->key) {
// NOTE(bill): no found, but there isn't any key removal for this hash map
return nullptr;
} else if (entry->key == key) {
return &entry->value;
}
index = (index+1) & mask;
} while (original_index != index);
return nullptr;
}
template <typename K, typename V>
gb_internal V *map_try_get(PtrMap<K, V> *h, K key, MapFindResult *fr_) {
MapFindResult fr = {MAP_SENTINEL, MAP_SENTINEL, MAP_SENTINEL};
if (h->hashes_count != 0) {
u32 hash = ptr_map_hash_key(key);
fr.hash_index = cast(MapIndex)(hash & (h->hashes_count-1));
fr.entry_index = h->hashes[fr.hash_index];
while (fr.entry_index != MAP_SENTINEL) {
auto *entry = &h->entries[fr.entry_index];
if (entry->key == key) {
return &entry->value;
}
fr.entry_prev = fr.entry_index;
fr.entry_index = entry->next;
gb_internal V *map_try_get(PtrMap<K, V> *h, K key, MapIndex *found_index_) {
if (found_index_) *found_index_ = ~(MapIndex)0;
if (h->count == 0) {
return nullptr;
}
if (key == 0) {
GB_PANIC("0 key");
}
u32 hash = ptr_map_hash_key(key);
u32 mask = (h->capacity-1);
u32 index = hash & mask;
u32 original_index = index;
do {
auto *entry = h->entries+index;
if (!entry->key) {
// NOTE(bill): no found, but there isn't any key removal for this hash map
return nullptr;
} else if (entry->key == key) {
if (found_index_) *found_index_ = index;
return &entry->value;
}
}
if (h->hashes_count == 0 || map__full(h)) {
map_grow(h);
}
if (fr_) *fr_ = fr;
index = (index+1) & mask;
} while (original_index != index);
return nullptr;
}
template <typename K, typename V>
gb_internal void map_set_internal_from_try_get(PtrMap<K, V> *h, K key, V const &value, MapFindResult const &fr) {
MapIndex index = map__add_entry(h, key);
if (fr.entry_prev != MAP_SENTINEL) {
h->entries[fr.entry_prev].next = index;
gb_internal void map_set_internal_from_try_get(PtrMap<K, V> *h, K key, V const &value, MapIndex found_index) {
if (found_index != MAP_SENTINEL) {
GB_ASSERT(h->entries[found_index].key == key);
h->entries[found_index].value = value;
} else {
h->hashes[fr.hash_index] = index;
map_set(h, key, value);
}
h->entries[index].value = value;
}
template <typename K, typename V>
@@ -269,116 +236,83 @@ gb_internal V &map_must_get(PtrMap<K, V> *h, K key) {
template <typename K, typename V>
gb_internal void map_set(PtrMap<K, V> *h, K key, V const &value) {
MapIndex index;
MapFindResult fr;
if (h->hashes_count == 0) {
map_grow(h);
}
fr = map__find(h, key);
if (fr.entry_index != MAP_SENTINEL) {
index = fr.entry_index;
} else {
index = map__add_entry(h, key);
if (fr.entry_prev != MAP_SENTINEL) {
h->entries[fr.entry_prev].next = index;
} else {
h->hashes[fr.hash_index] = index;
}
}
h->entries[index].value = value;
if (map__full(h)) {
map_grow(h);
GB_ASSERT(key != 0);
try_map_grow(h);
auto *found = map_get(h, key);
if (found) {
*found = value;
return;
}
map__insert(h, key, value);
}
// returns true if it previously existed
template <typename K, typename V>
gb_internal bool map_set_if_not_previously_exists(PtrMap<K, V> *h, K key, V const &value) {
MapIndex index;
MapFindResult fr;
if (h->hashes_count == 0) {
map_grow(h);
}
fr = map__find(h, key);
if (fr.entry_index != MAP_SENTINEL) {
try_map_grow(h);
auto *found = map_get(h, key);
if (found) {
return true;
} else {
index = map__add_entry(h, key);
if (fr.entry_prev != MAP_SENTINEL) {
h->entries[fr.entry_prev].next = index;
} else {
h->hashes[fr.hash_index] = index;
}
}
h->entries[index].value = value;
if (map__full(h)) {
map_grow(h);
}
map__insert(h, key, value);
return false;
}
template <typename K, typename V>
gb_internal void map__erase(PtrMap<K, V> *h, MapFindResult const &fr) {
MapFindResult last;
if (fr.entry_prev == MAP_SENTINEL) {
h->hashes[fr.hash_index] = h->entries[fr.entry_index].next;
} else {
h->entries[fr.entry_prev].next = h->entries[fr.entry_index].next;
}
if (fr.entry_index == h->count-1) {
h->count--;
return;
}
h->entries[fr.entry_index] = h->entries[h->count-1];
h->count--;
last = map__find(h, h->entries[fr.entry_index].key);
if (last.entry_prev != MAP_SENTINEL) {
h->entries[last.entry_prev].next = fr.entry_index;
} else {
h->hashes[last.hash_index] = fr.entry_index;
}
}
template <typename K, typename V>
gb_internal void map_remove(PtrMap<K, V> *h, K key) {
MapFindResult fr = map__find(h, key);
if (fr.entry_index != MAP_SENTINEL) {
map__erase(h, fr);
MapIndex found_index = 0;
if (map_try_get(h, key, &found_index)) {
h->entries[found_index].key = cast(K)MAP_TOMBSTONE;
h->count -= 1;
}
}
template <typename K, typename V>
gb_internal gb_inline void map_clear(PtrMap<K, V> *h) {
h->count = 0;
for (usize i = 0; i < h->hashes_count; i++) {
h->hashes[i] = MAP_SENTINEL;
}
gb_zero_array(h->entries, h->capacity);
}
#if PTR_MAP_ENABLE_MULTI_MAP
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> *multi_map_find_first(PtrMap<K, V> *h, K key) {
MapIndex i = map__find(h, key).entry_index;
if (i == MAP_SENTINEL) {
if (h->count == 0) {
return nullptr;
}
return &h->entries[i];
u32 hash = ptr_map_hash_key(key);
u32 mask = (h->capacity-1);
u32 index = hash & mask;
u32 original_index = index;
do {
auto *entry = h->entries+index;
if (!entry->key) {
// NOTE(bill): no found, but there isn't any key removal for this hash map
return nullptr;
} else if (entry->key == key) {
return entry;
}
index = (index+1) & mask;
} while (original_index != index);
return nullptr;
}
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> *multi_map_find_next(PtrMap<K, V> *h, PtrMapEntry<K, V> *e) {
MapIndex i = e->next;
while (i != MAP_SENTINEL) {
if (h->entries[i].key == e->key) {
return &h->entries[i];
u32 mask = h->capacity-1;
MapIndex index = cast(MapIndex)(e - h->entries);
MapIndex original_index = index;
do {
index = (index+1)&mask;
auto *entry = h->entries+index;
if (!entry->key) {
return nullptr;
}
i = h->entries[i].next;
}
if (entry->key == e->key) {
return entry;
}
} while (original_index != index);
return nullptr;
}
@@ -405,34 +339,16 @@ gb_internal void multi_map_get_all(PtrMap<K, V> *h, K key, V *items) {
template <typename K, typename V>
gb_internal void multi_map_insert(PtrMap<K, V> *h, K key, V const &value) {
MapFindResult fr;
MapIndex i;
if (h->hashes_count == 0) {
map_grow(h);
}
// Make
fr = map__find(h, key);
i = map__add_entry(h, key);
if (fr.entry_prev == MAP_SENTINEL) {
h->hashes[fr.hash_index] = i;
} else {
h->entries[fr.entry_prev].next = i;
}
h->entries[i].next = fr.entry_index;
h->entries[i].value = value;
// Grow if needed
if (map__full(h)) {
map_grow(h);
}
try_map_grow(h);
map__insert(h, key, value);
}
template <typename K, typename V>
gb_internal void multi_map_remove(PtrMap<K, V> *h, K key, PtrMapEntry<K, V> *e) {
MapFindResult fr = map__find_from_entry(h, e);
if (fr.entry_index != MAP_SENTINEL) {
map__erase(h, fr);
}
}
// template <typename K, typename V>
// gb_internal void multi_map_remove(PtrMap<K, V> *h, K key, PtrMapEntry<K, V> *e) {
// if (fr.entry_index != MAP_SENTINEL) {
// map__erase(h, fr);
// }
// }
template <typename K, typename V>
gb_internal void multi_map_remove_all(PtrMap<K, V> *h, K key) {
@@ -443,22 +359,77 @@ gb_internal void multi_map_remove_all(PtrMap<K, V> *h, K key) {
#endif
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> *begin(PtrMap<K, V> &m) {
return m.entries;
}
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> const *begin(PtrMap<K, V> const &m) {
return m.entries;
}
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> *end(PtrMap<K, V> &m) {
return m.entries + m.count;
struct PtrMapIterator {
PtrMap<K, V> *map;
MapIndex index;
PtrMapIterator<K, V> &operator++() noexcept {
for (;;) {
++index;
if (map->capacity == index) {
return *this;
}
PtrMapEntry<K, V> *entry = map->entries+index;
if (entry->key && entry->key != cast(K)MAP_TOMBSTONE) {
return *this;
}
}
}
bool operator==(PtrMapIterator<K, V> const &other) const noexcept {
return this->map == other->map && this->index == other->index;
}
operator PtrMapEntry<K, V> *() const {
return map->entries+index;
}
};
template <typename K, typename V>
gb_internal PtrMapIterator<K, V> end(PtrMap<K, V> &m) noexcept {
return PtrMapIterator<K, V>{&m, m.capacity};
}
template <typename K, typename V>
gb_internal PtrMapEntry<K, V> const *end(PtrMap<K, V> const &m) {
return m.entries + m.count;
gb_internal PtrMapIterator<K, V> const end(PtrMap<K, V> const &m) noexcept {
return PtrMapIterator<K, V>{&m, m.capacity};
}
template <typename K, typename V>
gb_internal PtrMapIterator<K, V> begin(PtrMap<K, V> &m) noexcept {
if (m.count == 0) {
return end(m);
}
MapIndex index = 0;
while (index < m.capacity) {
auto key = m.entries[index].key;
if (key && key != cast(K)MAP_TOMBSTONE) {
break;
}
index++;
}
return PtrMapIterator<K, V>{&m, index};
}
template <typename K, typename V>
gb_internal PtrMapIterator<K, V> const begin(PtrMap<K, V> const &m) noexcept {
if (m.count == 0) {
return end(m);
}
MapIndex index = 0;
while (index < m.capacity) {
auto key = m.entries[index].key;
if (key && key != cast(K)MAP_TOMBSTONE) {
break;
}
index++;
}
return PtrMapIterator<K, V>{&m, index};
}