Release v2.5.0

CHANGELOG.md

@@ -7,18 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.5.0] - 2026-09-24
+
 ### Added
 
 - `wpMiscUtilsRotl64` utility
 - `WpHasher` interface
+- `wpCustomHasher` constructor for custom hasher with user-defined context
 - `wpHasherGetHash128` and `wpHasherGetHash64` utilities
-- `wpMur3HasherData` to setup the MurmurHash3 data struct
-- `wpX64Mur3Hasher` constructor for the hasher interface
-- `wpX64Mur3Hasher128` implementation for the x64 128-bit variant of the MurmurHash3 algorithm
-- `wpSip24HasherData` and `wpSip48HasherData` to setup the siphash data structs for the different variants
-- `wpSipHasher` constructor for the hasher interface
-- `wpSipHasher128` implementation for the 128 variant of siphash
-- Add `wpU8Const`, `wpU16Const`, `wpU32Const`, `wpU64Const`, `wpI8Const`, `wpI16Const`, `wpI32Const`, and `wpI64Const`
+- `wpX64Mur3Hasher` and `wpX64Mur3HasherWithSeed` constructors for the hasher interface
+- `wpX64Mur3GetHash128` implementation for the x64 128-bit variant of the MurmurHash3 algorithm
+- `wpSip24Hasher`, `wpSip48Hasher`, `wpSip24HasherWithKey` and `wpSip48HasherWithKey` constructors for the hasher interface
+- `wpSipGetHash128` implementation for the 128 variant of siphash
+- `wpHashSet`, `wpHashSetCustomHasher`, `wpHashSetAlloc` and `wpHashSetCustomHasherAlloc` constructors
+- `wpHashSetFind`, `wpHashSetInsertCapped`, `wpHashSetInsertAlloc`, `wpHashSetRemove`, `wpHashSetItems`, `wpHashSetCapacity`, `wpHashSetCount`, `wpHashSetItemSize`, `wpHashSetClear` and `wpHashSetDealloc` utilities
+- `wpHashMap`, `wpHashMapCustomHasher`, `wpHashMapAlloc` and `wpHashMapCustomHasherAlloc` constructors
+- `wpHashMapKeys`, `wpHashMapValues`, `wpHashMapCapacity`, `wpHashMapCount`, `wpHashMapKeySize`, `wpHashMapValueSize`, `wpHashMapFind`, `wpHashMapInsertCapped`, `wpHashMapInsertOrUpdateCapped`, `wpHashMapUpdate`, `wpHashMapInsertAlloc`, `wpHashMapInsertOrUpdateAlloc`, `wpHashMapRemove`, `wpHashMapClear` and `wpHashMapDealloc` utilities
+- `wpU8Const`, `wpU16Const`, `wpU32Const`, `wpU64Const`, `wpI8Const`, `wpI16Const`, `wpI32Const`, and `wpI64Const` aliases
 - `wpPrngXorshiftInitWithSeed` to allow for user control with PRNG
 - `wpPrngXorshift256InRange`, `wpPrngXorshift256ssInRange`, `wpPrngXorshift256pInRange`, `wpPrngXorshift256Choice`, `wpPrngXorshift256ssChoice` and `wpPrngXorshift256pChoice` utilities
 - `WpSplitmix64State`

VERSION

@@ -1 +1 @@
-2.4.0
+2.5.0

src/base/array/array.c

@@ -204,11 +204,15 @@ void arrayRemoveSwapEnd(WpArray array, u64 index, u64 item_size) {
 	if (header->count == 0 || index > header->count) { return; }
 
 	u64 last_item_index = header->count - 1;
-	void *cur_item      = arrayGetItemWithOffset(array, header->item_size * index);
-	void *last_item     = arrayGetItemWithOffset(array, header->item_size * last_item_index);
 
-	memcpy(cur_item, last_item, header->item_size);
-	memset(last_item, 0, header->item_size);
+	if (index < last_item_index) {
+		void *cur_item  = arrayGetItemWithOffset(array, header->item_size * index);
+		void *last_item = arrayGetItemWithOffset(array, header->item_size * last_item_index);
+
+		memcpy(cur_item, last_item, header->item_size);
+		memset(last_item, 0, header->item_size);
+	}
+
 	--(header->count);
 }
 

src/base/hash/hasher/hasher.c

@@ -3,13 +3,23 @@
 #include "hasher.h"
 #include "../../../common/assert/assert.h"
 
-WpU128Hash wpHasherGetHash128(const WpHasher *hasher, WpU8Stream *stream) {
+WpHasher wpCustomHasher(WpHashFunc func, void *ctx) {
+	return (WpHasher){
+		.func = func,
+		.ctx  = (WpHasherCtx){
+			.type = WP_HASHER_CTX_USER_DEFINED,
+			.user = ctx,
+		}
+	};
+}
+
+WpU128 wpHasherGetHash128(const WpHasher *hasher, WpU8Stream *stream) {
 	wpDebugAssert(hasher != NULL && stream != NULL, "hasher and stream shouldn't be NULL");
-	return hasher->func(stream, hasher->data);
+	return hasher->func(stream, hasher->ctx);
 }
 
 u64 wpHasherGetHash64(const WpHasher *hasher, WpU8Stream *stream) {
 	wpDebugAssert(hasher != NULL && stream != NULL, "hasher and stream shouldn't be NULL");
-	WpU128Hash result = hasher->func(stream, hasher->data);
-	return result.hash[0] ^ result.hash[1];
+	WpU128 result = hasher->func(stream, hasher->ctx);
+	return result.value[0] ^ result.value[1];
 }

src/base/hash/hasher/hasher.h

@@ -4,24 +4,49 @@
 #define HASHER_H
 
 #include "../../stream/stream.h"
+#include "../../../common/aliases/aliases.h"
 
 #ifdef WP_PLATFORM_CPP
 BEGIN_C_LINKAGE
 #endif // !WP_PLATFORM_CPP
 
-typedef struct WpU128Hash {
-	u64 hash[2];
-} WpU128Hash;
+typedef struct WpU128 {
+	u64 value[2];
+} WpU128;
 
-typedef WpU128Hash (*WpHashFunc)(WpU8Stream *stream, void *hasher_data);
+typedef enum WpHasherCtxType {
+	WP_HASHER_CTX_MURMUR3,
+	WP_HASHER_CTX_SIPHASH,
+	WP_HASHER_CTX_USER_DEFINED,
+
+	COUNT_HASHER_CTX,
+} WpHasherCtxType;
+
+typedef struct WpSiphashCtx {
+	WpU128 key;
+	u64    compression;
+	u64    finalisation;
+} WpSiphashCtx;
+
+typedef struct WpHasherCtx {
+	WpHasherCtxType type;
+	union {
+		WpSiphashCtx siphash;
+		void        *user;
+		u32          murmur3;
+	};
+} WpHasherCtx;
+
+typedef WpU128 (*WpHashFunc)(WpU8Stream *stream, WpHasherCtx ctx);
 
 typedef struct WpHasher {
-	WpHashFunc func;
-	void      *data;
+	WpHashFunc  func;
+	WpHasherCtx ctx;
 } WpHasher;
 
-WpU128Hash wpHasherGetHash128(const WpHasher *hasher, WpU8Stream *stream);
-u64        wpHasherGetHash64 (const WpHasher *hasher, WpU8Stream *stream);
+WpHasher wpCustomHasher(WpHashFunc func, void *ctx);
+WpU128   wpHasherGetHash128(const WpHasher *hasher, WpU8Stream *stream);
+u64      wpHasherGetHash64(const WpHasher *hasher, WpU8Stream *stream);
 
 #ifdef WP_PLATFORM_CPP
 END_C_LINKAGE

src/base/hash/hasher/murmur3.c

@@ -5,22 +5,34 @@
 #include "../../../common/aliases/aliases.h"
 #include "../../../common/assert/assert.h"
 #include "../../../common/misc/misc_utils.h"
+#include "../../../prng/xorshift/xorshift.h"
 
-wp_intern inline void validateMur3HasherData(const WpMur3HasherData *io);
+wp_intern inline void validateMur3HasherCtx(const WpHasherCtx *ctx);
 wp_intern inline u64 fmix64(u64 k);
 
-WpHasher wpX64Mur3Hasher(WpMur3HasherData *data) {
-	return (WpHasher){ .func = wpX64Mur3Hasher128, .data = (void *)data };
+WpHasher wpX64Mur3Hasher(void) {
+	WpXor256State state = wpPrngXorshiftInit();
+	u32 seed            = (u32)wpPrngXorshift256(&state);
+	return wpX64Mur3HasherWithSeed(seed);
 }
 
-WpU128Hash wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io) {
-	WpMur3HasherData *io = (WpMur3HasherData *)hasher_io;
-	validateMur3HasherData(io);
+WpHasher wpX64Mur3HasherWithSeed(u32 seed) {
+	return (WpHasher){
+		.func = wpX64Mur3GetHash128,
+		.ctx  = (WpHasherCtx){
+			.type    = WP_HASHER_CTX_MURMUR3,
+			.murmur3 = seed,
+		},
+	};
+}
+
+WpU128 wpX64Mur3GetHash128(WpU8Stream *bytes, WpHasherCtx ctx) {
+	validateMur3HasherCtx(&ctx);
 
 	const i32 nblocks = (bytes->count * bytes->item_size) / 16;
 
-	u64 h1 = io->seed;
-	u64 h2 = io->seed;
+	u64 h1 = ctx.murmur3;
+	u64 h2 = ctx.murmur3;
 
 	const u64 c1 = wpU64Const(0x87c37b91114253d5);
 	const u64 c2 = wpU64Const(0x4cf5ad432745937f);
@@ -96,11 +108,11 @@ WpU128Hash wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io) {
 	h1 += h2;
 	h2 += h1;
 
-	return (WpU128Hash){ .hash = { [0] = h1, [1] = h2 } };
+	return (WpU128){ .value = { [0] = h1, [1] = h2 } };
 }
 
-wp_intern inline void validateMur3HasherData(const WpMur3HasherData *data) {
-	wpRuntimeAssert(data->magic == WP_MUR3_HASHER_MAGIC, "Invalid Murmur3 hash data");
+wp_intern inline void validateMur3HasherCtx(const WpHasherCtx *ctx) {
+	wpRuntimeAssert(ctx->type == WP_HASHER_CTX_MURMUR3, "Invalid Murmur3 hash context");
 }
 
 wp_intern inline u64 fmix64(u64 k) {

src/base/hash/hasher/murmur3.h

@@ -17,21 +17,9 @@
 BEGIN_C_LINKAGE
 #endif // !WP_PLATFORM_CPP
 
-#define WP_MUR3_HASHER_MAGIC wpU64Const(0x57504d4841534833)
-
-typedef struct WpMur3HasherData {
-	u64 magic;
-	u32 seed;
-} WpMur3HasherData;
-
-#ifdef WP_PLATFORM_CPP
-#define wpMur3HasherData(SEED) (WpMur3HasherData{WP_MUR3_HASHER_MAGIC, SEED})
-#else
-#define wpMur3HasherData(SEED) ((WpMur3HasherData){ .magic = WP_MUR3_HASHER_MAGIC, .seed = SEED })
-#endif
-
-WpHasher   wpX64Mur3Hasher(WpMur3HasherData *data);
-WpU128Hash wpX64Mur3Hasher128(WpU8Stream *bytes, void *hasher_io);
+WpHasher wpX64Mur3Hasher(void);
+WpHasher wpX64Mur3HasherWithSeed(u32 seed);
+WpU128   wpX64Mur3GetHash128(WpU8Stream *bytes, WpHasherCtx ctx);
 
 #ifdef WP_PLATFORM_CPP
 END_C_LINKAGE

src/base/hash/hasher/siphash.c

@@ -5,10 +5,11 @@
 #include "../../../common/aliases/aliases.h"
 #include "../../../common/assert/assert.h"
 #include "../../../common/misc/misc_utils.h"
+#include "../../../prng/xorshift/xorshift.h"
 
-wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8 *out, u64 outlen);
-wp_intern inline void validateSipHasherData(const WpSipHasherData *io);
-wp_intern inline b8 checkRounds(const WpSipHasherData *params);
+wp_intern inline void siphash(WpStream *bytes, const WpHasherCtx *ctx, u8 *out, u64 outlen);
+wp_intern inline void validateSipHasherCtx(const WpHasherCtx *ctx);
+wp_intern inline b8 checkRounds(const WpHasherCtx *ctx);
 
 #define _u32To8LE(p, v)                                                                            \
 	(p)[0] = (u8)((v));                                                                              \
@@ -44,24 +45,50 @@ wp_intern inline b8 checkRounds(const WpSipHasherData *params);
 		v2 = wpMiscUtilsRotl64(v2, 32);                                                                \
 	} while (0)
 
-WpHasher wpSipHasher(WpSipHasherData *data) {
-	return (WpHasher){ .func = wpSipHasher128, .data = (void *)data };
+WpHasher wpSip24Hasher(void) {
+	WpXor256State state = wpPrngXorshiftInit();
+	WpU128 key          = { .value = { wpPrngXorshift256(&state), wpPrngXorshift256(&state) } };
+	return wpSip24HasherWithKey(key);
 }
 
-WpU128Hash wpSipHasher128(WpStream *bytes, void *hasher_data) {
-	WpSipHasherData *data = (WpSipHasherData *)hasher_data;
-	validateSipHasherData(data);
-	WpU128Hash output = {0};
-	siphash(bytes, data, (u8 *)&output.hash, sizeof(u64) * 2);
+WpHasher wpSip48Hasher(void) {
+	WpXor256State state = wpPrngXorshiftInit();
+	WpU128 key          = { .value = { wpPrngXorshift256(&state), wpPrngXorshift256(&state) } };
+	return wpSip48HasherWithKey(key);
+}
+
+WpHasher wpSip24HasherWithKey(WpU128 key) {
+	return (WpHasher){
+		.func = wpSipGetHash128,
+		.ctx  = (WpHasherCtx){
+			.type    = WP_HASHER_CTX_SIPHASH,
+			.siphash = (WpSiphashCtx){ .key = key, .compression = 2, .finalisation = 4 },
+		},
+	};
+}
+
+WpHasher wpSip48HasherWithKey(WpU128 key) {
+	return (WpHasher){
+		.func = wpSipGetHash128,
+		.ctx  = (WpHasherCtx){
+			.type    = WP_HASHER_CTX_SIPHASH,
+			.siphash = (WpSiphashCtx){ .key = key, .compression = 4, .finalisation = 8 },
+		},
+	};
+}
+
+WpU128 wpSipGetHash128(WpStream *bytes, WpHasherCtx ctx) {
+	validateSipHasherCtx(&ctx);
+	WpU128 output = {0};
+	siphash(bytes, &ctx, (u8 *)&output.value, sizeof(u64) * 2);
 	return output;
 }
 
 /**
  * Implementation of the 128-variant of the siphash algorithm
  */
-wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8 *out,
-                              u64 outlen) {
-	const u8 *kk = (const u8 *)&params->key;
+wp_intern inline void siphash(WpStream *bytes, const WpHasherCtx *ctx, u8 *out, u64 outlen) {
+	const u8 *kk = (const u8 *)&ctx->siphash.key;
 	u64 inlen    = bytes->count * bytes->item_size;
 
 	wpRuntimeAssert(outlen == 16, "outlen should be 16");
@@ -89,7 +116,7 @@ wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8
 		m = _u8To64LE(data);
 		v3 ^= m;
 
-		for (i = 0; i < params->compression; ++i) {
+		for (i = 0; i < ctx->siphash.compression; ++i) {
 			_sipRound;
 		}
 
@@ -125,7 +152,7 @@ wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8
 
 	v3 ^= b;
 
-	for (i = 0; i < params->compression; ++i) {
+	for (i = 0; i < ctx->siphash.compression; ++i) {
 		_sipRound;
 	}
 
@@ -133,7 +160,7 @@ wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8
 
 	v2 ^= 0xee;
 
-	for (i = 0; i < params->finalisation; ++i) {
+	for (i = 0; i < ctx->siphash.finalisation; ++i) {
 		_sipRound;
 	}
 
@@ -142,7 +169,7 @@ wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8
 
 	v1 ^= 0xdd;
 
-	for (i = 0; i < params->finalisation; ++i) {
+	for (i = 0; i < ctx->siphash.finalisation; ++i) {
 		_sipRound;
 	}
 
@@ -150,14 +177,14 @@ wp_intern inline void siphash(WpStream *bytes, const WpSipHasherData *params, u8
 	_u64To8LE(out + 8, b);
 }
 
-wp_intern inline void validateSipHasherData(const WpSipHasherData *data) {
-	b8 magic_match = data->magic == WP_SIP_HASHER_MAGIC;
-	b8 rounds      = checkRounds(data);
-	wpRuntimeAssert(magic_match && rounds, "Invalid Siphash data");
+wp_intern inline void validateSipHasherCtx(const WpHasherCtx *ctx) {
+	b8 magic_match = ctx->type == WP_HASHER_CTX_SIPHASH;
+	b8 rounds      = checkRounds(ctx);
+	wpRuntimeAssert(magic_match && rounds, "Invalid Siphash context");
 }
 
-wp_intern inline b8 checkRounds(const WpSipHasherData *data) {
-	b8 rounds24 = data->compression == 2 && data->finalisation == 4;
-	b8 rounds48 = data->compression == 4 && data->finalisation == 8;
+wp_intern inline b8 checkRounds(const WpHasherCtx *ctx) {
+	b8 rounds24 = ctx->siphash.compression == 2 && ctx->siphash.finalisation == 4;
+	b8 rounds48 = ctx->siphash.compression == 4 && ctx->siphash.finalisation == 8;
 	return rounds24 || rounds48;
 }

src/base/hash/hasher/siphash.h

@@ -1,8 +1,8 @@
 // vim:fileencoding=utf-8:foldmethod=marker
 
 /**
- * Implementations of the SipHash-2-4-128, SipHash4-8-128, SipHash-2-4-64 and SipHash4-8-64
- * algorithms based on https://github.com/veorq/SipHash/blob/master/siphash.c
+ * Implementations of the SipHash-2-4-128, SipHash4-8-128 algorithms based on
+ * https://github.com/veorq/SipHash/blob/master/siphash.c
  */
 
 #ifndef SIPHASH_H
@@ -10,47 +10,17 @@
 
 #include "hasher.h"
 #include "../../stream/stream.h"
-#include "../../../common/aliases/aliases.h"
 #include "../../../common/platform/platform.h"
 
 #ifdef WP_PLATFORM_CPP
 BEGIN_C_LINKAGE
 #endif // !WP_PLATFORM_CPP
 
-#define WP_SIP_HASHER_MAGIC wpU64Const(0x5750534950485348)
-
-typedef struct WpSipHasherKey {
-	u64 lo;
-	u64 hi;
-} WpSipHasherKey;
-
-typedef struct WpSipHasherData {
-	WpSipHasherKey key;
-	u64 magic;
-	u64 compression;
-	u64 finalisation;
-} WpSipHasherData;
-
-#ifdef WP_PLATFORM_CPP
-#define wpSip24HasherData(KEY) (WpSipHasherData{(KEY), WP_SIP_HASHER_MAGIC, 2, 4})
-#define wpSip48HasherData(KEY) (WpSipHasherData{(KEY), WP_SIP_HASHER_MAGIC, 4, 8})
-#else
-#define wpSip24HasherData(KEY) ((WpSipHasherData){                                                 \
-	.key          = (KEY),                                                                           \
-	.magic        = WP_SIP_HASHER_MAGIC,                                                             \
-	.compression  = 2,                                                                               \
-	.finalisation = 4,                                                                               \
-})
-#define wpSip48HasherData(KEY) ((WpSipHasherData){                                                 \
-	.key          = (KEY),                                                                           \
-	.magic        = WP_SIP_HASHER_MAGIC,                                                             \
-	.compression  = 4,                                                                               \
-	.finalisation = 8,                                                                               \
-})
-#endif
-
-WpHasher   wpSipHasher(WpSipHasherData *data);
-WpU128Hash wpSipHasher128(WpU8Stream *bytes, void *hasher_io);
+WpHasher wpSip24Hasher(void);
+WpHasher wpSip48Hasher(void);
+WpHasher wpSip24HasherWithKey(WpU128 key);
+WpHasher wpSip48HasherWithKey(WpU128 key);
+WpU128   wpSipGetHash128(WpU8Stream *bytes, WpHasherCtx ctx);
 
 #ifdef WP_PLATFORM_CPP
 END_C_LINKAGE

src/base/hash/map/map.c

@@ -0,0 +1,83 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "map.h"
+#include "../table/table.h"
+
+WpHashMap hashMapAlloc(const WpAllocator *allocator, WpU8StreamEncoder encoder, WpKeyEqualTest key_eq,
+                       u64 capacity, u64 key_size, u64 value_size) {
+	return hashMapAllocWithCustomHasher(allocator, WP_HASH_TABLE_DEFAULT_HASHER, encoder, key_eq,
+	                                    capacity, key_size, value_size);
+}
+
+WpHashMap hashMapAllocWithCustomHasher(const WpAllocator *allocator, WpHasher hasher,
+                                       WpU8StreamEncoder encoder, WpKeyEqualTest key_eq,
+                                       u64 capacity, u64 key_size, u64 value_size) {
+	WpHashMap map = {0};
+	hashTableAlloc(allocator, &map, hasher, encoder, key_eq, capacity, key_size, value_size, true);
+	return map;
+}
+
+WpHashLookupResult hashMapFind(WpHashMap *map, void *key, u64 key_size) {
+	u64 hash            = hashTableCalcHash(map, key, key_size);
+	WpHashBucketRef ref = hashTableBucketRef(map, hash);
+	return hashTableLookup(map, key, ref, key_size);
+}
+
+void hashMapUpdate(WpHashMap *map, void *key, void *value, u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (result.found) {
+		hashTableUpdate(map, value, result.ref, value_size);
+	}
+}
+
+void hashMapInsertCapped(WpHashMap *map, void *key, void *value, u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (!result.found && map->load_factor < WP_HASH_MAX_LOAD_FACTOR) {
+		hashTableInsert(map, key, value, result.ref, key_size, value_size);
+	}
+}
+
+void hashMapInsertOrUpdateCapped(WpHashMap *map, void *key, void *value, u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (result.found) {
+		hashTableUpdate(map, value, result.ref, value_size);
+	} else if (map->load_factor < WP_HASH_MAX_LOAD_FACTOR) {
+		hashTableInsert(map, key, value, result.ref, key_size, value_size);
+	}
+}
+
+void hashMapInsertAlloc(const WpAllocator *allocator, WpHashMap *map, void *key, void *value,
+                        u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (!result.found) {
+		if (map->load_factor >= WP_HASH_MAX_LOAD_FACTOR) {
+			hashTableGrow(allocator, map, key_size, value_size);
+			// Rerun key lookup after growing
+			result = hashMapFind(map, key, key_size);
+		}
+
+		hashTableInsert(map, key, value, result.ref, key_size, value_size);
+	}
+}
+
+void hashMapInsertOrUpdateAlloc(const WpAllocator *allocator, WpHashMap *map, void *key, void *value,
+                                u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (result.found) {
+		hashTableUpdate(map, value, result.ref, value_size);
+	} else {
+		if (map->load_factor >= WP_HASH_MAX_LOAD_FACTOR) {
+			hashTableGrow(allocator, map, key_size, value_size);
+			// Rerun key lookup after growing
+			result = hashMapFind(map, key, key_size);
+		}
+		hashTableInsert(map, key, value, result.ref, key_size, value_size);
+	}
+}
+
+void hashMapRemove(WpHashMap *map, void *key, u64 key_size, u64 value_size) {
+	WpHashLookupResult result = hashMapFind(map, key, key_size);
+	if (result.found) {
+		hashTableRemove(map, result.ref, key_size, value_size);
+	}
+}

src/base/hash/map/map.h

@@ -0,0 +1,134 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef MAP_H
+#define MAP_H
+
+#include "../table/table.h"
+#include "../../../common/misc/misc_utils.h"
+#include "../../../common/platform/platform.h"
+
+#ifdef WP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+typedef WpHashTable WpHashMap;
+
+#ifdef WP_PLATFORM_CPP
+#define wpHashMap(KEY_TYPE, VALUE_TYPE, U8_STREAM_ENCODER, KEY_EQ_TEST, CAPACITY)                  \
+	(WpHashMap{                                                                                      \
+		WP_HASH_TABLE_DEFAULT_HASHER,                                                                  \
+		U8_STREAM_ENCODER,                                                                             \
+		KEY_EQ_TEST,                                                                                   \
+		wpArrayWithCapacity(KEY_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),        \
+		wpArrayWithCapacity(VALUE_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),      \
+		wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_FILLED),  \
+		WP_HASH_TABLE_MAGIC,                                                                           \
+		wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                                       \
+		0.0f,                                                                                          \
+		true,                                                                                          \
+	})
+#define wpHashMapCustomHasher(KEY_TYPE, VALUE_TYPE, HASHER, U8_STREAM_ENCODER, KEY_EQ_TEST,        \
+                              CAPACITY)                                                            \
+	(WpHashMap{                                                                                      \
+		HASHER,                                                                                        \
+		U8_STREAM_ENCODER,                                                                             \
+		KEY_EQ_TEST,                                                                                   \
+		wpArrayWithCapacity(KEY_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),        \
+		wpArrayWithCapacity(VALUE_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),      \
+		wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_FILLED),  \
+		WP_HASH_TABLE_MAGIC,                                                                           \
+		wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                                       \
+		0.0f,                                                                                          \
+		true,                                                                                          \
+	})
+#else
+#define wpHashMap(KEY_TYPE, VALUE_TYPE, U8_STREAM_ENCODER, KEY_EQ_TEST, CAPACITY)                  \
+	((WpHashMap){                                                                                    \
+		.hasher      = WP_HASH_TABLE_DEFAULT_HASHER,                                                   \
+		.encoder     = U8_STREAM_ENCODER,                                                              \
+		.key_eq      = KEY_EQ_TEST,                                                                    \
+		.keys        = wpArrayWithCapacity(KEY_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),              \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.values      = wpArrayWithCapacity(VALUE_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),            \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.buckets     = wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY),          \
+		                                   WP_ARRAY_INIT_FILLED),                                      \
+		.magic       = WP_HASH_TABLE_MAGIC,                                                            \
+		.bucket_mask = wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                        \
+		.has_values  = true,                                                                           \
+	})
+#define wpHashMapCustomHasher(KEY_TYPE, VALUE_TYPE, HASHER, U8_STREAM_ENCODER, KEY_EQ_TEST,        \
+                              CAPACITY)                                                            \
+	((WpHashMap){                                                                                    \
+		.hasher      = HASHER,                                                                         \
+		.encoder     = U8_STREAM_ENCODER,                                                              \
+		.key_eq      = KEY_EQ_TEST,                                                                    \
+		.keys        = wpArrayWithCapacity(KEY_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),              \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.values      = wpArrayWithCapacity(VALUE_TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),            \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.buckets     = wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY),          \
+		                                   WP_ARRAY_INIT_FILLED),                                      \
+		.magic       = WP_HASH_TABLE_MAGIC,                                                            \
+		.bucket_mask = wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                        \
+		.has_values  = true,                                                                           \
+	})
+#endif
+
+#define wpHashMapAlloc(KEY_TYPE, VALUE_TYPE, ALLOCATOR_PTR, U8_STREAM_ENCODER, KEY_EQ_TEST,        \
+                       CAPACITY)                                                                   \
+	hashMapAlloc(ALLOCATOR_PTR, U8_STREAM_ENCODER, KEY_EQ_TEST, CAPACITY, sizeof(KEY_TYPE),          \
+	             sizeof(VALUE_TYPE))
+#define wpHashMapCustomHasherAlloc(KEY_TYPE, VALUE_TYPE, ALLOCATOR_PTR, HASHER, U8_STREAM_ENCODER, \
+                                   KEY_EQ_TEST, CAPACITY)                                          \
+	hashMapAllocWithCustomHasher(ALLOCATOR_PTR, HASHER, U8_STREAM_ENCODER, KEY_EQ_TEST, CAPACITY,    \
+	                             sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapKeys(KEY_TYPE, MAP_PTR) ((KEY_TYPE *)hashTableKeys(MAP_PTR, sizeof(KEY_TYPE)))
+#define wpHashMapValues(VALUE_TYPE, MAP_PTR)                                                       \
+	((VALUE_TYPE *)hashTableValues(MAP_PTR, sizeof(VALUE_TYPE)))
+#define wpHashMapCapacity(MAP_PTR) hashTableCapacity(MAP_PTR)
+#define wpHashMapCount(MAP_PTR) hashTableCount(MAP_PTR)
+#define wpHashMapKeySize(MAP_PTR) hashTableKeySize(MAP_PTR)
+#define wpHashMapValueSize(MAP_PTR) hashTableValueSize(MAP_PTR)
+#define wpHashMapFind(KEY_TYPE, MAP_PTR, KEY_PTR) hashMapFind(MAP_PTR, KEY_PTR, sizeof(KEY_TYPE))
+#define wpHashMapInsertCapped(KEY_TYPE, VALUE_TYPE, MAP_PTR, KEY_PTR, VALUE_PTR)                   \
+	hashMapInsertCapped(MAP_PTR, KEY_PTR, VALUE_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapInsertOrUpdateCapped(KEY_TYPE, VALUE_TYPE, MAP_PTR, KEY_PTR, VALUE_PTR)           \
+	hashMapInsertOrUpdateCapped(MAP_PTR, KEY_PTR, VALUE_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapUpdate(KEY_TYPE, VALUE_TYPE, MAP_PTR, KEY_PTR, VALUE_PTR)                         \
+	hashMapUpdate(MAP_PTR, KEY_PTR, VALUE_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapInsertAlloc(KEY_TYPE, VALUE_TYPE, ALLOCATOR_PTR, MAP_PTR, KEY_PTR, VALUE_PTR)     \
+	hashMapInsertAlloc(ALLOCATOR_PTR, MAP_PTR, KEY_PTR, VALUE_PTR, sizeof(KEY_TYPE),                 \
+	                   sizeof(VALUE_TYPE))
+#define wpHashMapInsertOrUpdateAlloc(KEY_TYPE, VALUE_TYPE, ALLOCATOR_PTR, MAP_PTR, KEY_PTR,        \
+                                     VALUE_PTR)                                                    \
+	hashMapInsertOrUpdateAlloc(ALLOCATOR_PTR, MAP_PTR, KEY_PTR, VALUE_PTR, sizeof(KEY_TYPE),         \
+	                           sizeof(VALUE_TYPE))
+#define wpHashMapRemove(KEY_TYPE, VALUE_TYPE, MAP_PTR, KEY_PTR)                                    \
+	hashMapRemove(MAP_PTR, KEY_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapClear(KEY_TYPE, VALUE_TYPE, MAP_PTR)                                              \
+	hashTableClear(MAP_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+#define wpHashMapDealloc(KEY_TYPE, VALUE_TYPE, ALLOCATOR_PTR, MAP_PTR)                             \
+	hashTableDealloc(ALLOCATOR_PTR, MAP_PTR, sizeof(KEY_TYPE), sizeof(VALUE_TYPE))
+
+WpHashMap          hashMapAlloc(const WpAllocator *allocator, WpU8StreamEncoder encoder,
+                                WpKeyEqualTest key_eq, u64 capacity, u64 key_size, u64 value_size);
+WpHashMap          hashMapAllocWithCustomHasher(const WpAllocator *allocator, WpHasher hasher,
+                                                WpU8StreamEncoder encoder, WpKeyEqualTest key_eq,
+                                                u64 capacity, u64 key_size, u64 value_size);
+WpHashLookupResult hashMapFind(WpHashMap *map, void *key, u64 key_size);
+void               hashMapUpdate(WpHashMap *map, void *key, void *value, u64 key_size, u64 value_size);
+void               hashMapInsertCapped(WpHashMap *map, void *key, void *value, u64 key_size, u64 value_size);
+void               hashMapInsertOrUpdateCapped(WpHashMap *map, void *key, void *value, u64 key_size,
+                                               u64 value_size);
+void               hashMapInsertAlloc(const WpAllocator *allocator, WpHashMap *map, void *key,
+                                      void *value, u64 key_size, u64 value_size);
+void               hashMapInsertOrUpdateAlloc(const WpAllocator *allocator, WpHashMap *map, void *key,
+                                              void *value, u64 key_size, u64 value_size);
+void               hashMapRemove(WpHashMap *map, void *key, u64 key_size, u64 value_size);
+
+#ifdef WP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#endif // !MAP_H

src/base/hash/set/set.c

@@ -0,0 +1,51 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "set.h"
+#include "../table/table.h"
+
+WpHashSet hashSetAlloc(const WpAllocator *allocator, WpU8StreamEncoder encoder, WpKeyEqualTest key_eq,
+                       u64 capacity, u64 key_size) {
+	return hashSetAllocWithCustomHasher(allocator, WP_HASH_TABLE_DEFAULT_HASHER, encoder, key_eq,
+	                                    capacity, key_size);
+}
+
+WpHashSet hashSetAllocWithCustomHasher(const WpAllocator *allocator, WpHasher hasher,
+                                       WpU8StreamEncoder encoder, WpKeyEqualTest key_eq, u64 capacity,
+                                       u64 key_size) {
+	WpHashSet set = {0};
+	hashTableAlloc(allocator, &set, hasher, encoder, key_eq, capacity, key_size, 0, false);
+	return set;
+}
+
+WpHashLookupResult hashSetFind(WpHashSet *set, void *item, u64 item_size) {
+	u64 hash            = hashTableCalcHash(set, item, item_size);
+	WpHashBucketRef ref = hashTableBucketRef(set, hash);
+	return hashTableLookup(set, item, ref, item_size);
+}
+
+void hashSetInsertCapped(WpHashSet *set, void *item, u64 item_size) {
+	WpHashLookupResult result = hashSetFind(set, item, item_size);
+	if (!result.found && set->load_factor < WP_HASH_MAX_LOAD_FACTOR) {
+		hashTableInsert(set, item, NULL, result.ref, item_size, 0);
+	}
+}
+
+void hashSetInsertAlloc(const WpAllocator *allocator, WpHashSet *set, void *item, u64 item_size) {
+	WpHashLookupResult result = hashSetFind(set, item, item_size);
+	if (!result.found) {
+		if (set->load_factor >= WP_HASH_MAX_LOAD_FACTOR) {
+			hashTableGrow(allocator, set, item_size, 0);
+			// Rerun item lookup after growing
+			result = hashSetFind(set, item, item_size);
+		}
+
+		hashTableInsert(set, item, NULL, result.ref, item_size, 0);
+	}
+}
+
+void hashSetRemove(WpHashSet *set, void *item, u64 item_size) {
+	WpHashLookupResult result = hashSetFind(set, item, item_size);
+	if (result.found) {
+		hashTableRemove(set, result.ref, item_size, 0);
+	}
+}

src/base/hash/set/set.h

@@ -0,0 +1,105 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef SET_H
+#define SET_H
+
+#include "../table/table.h"
+#include "../../../common/misc/misc_utils.h"
+#include "../../../common/platform/platform.h"
+
+#ifdef WP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+typedef WpHashTable WpHashSet;
+
+#ifdef WP_PLATFORM_CPP
+#define wpHashSet(TYPE, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY)                                 \
+	(WpHashSet{                                                                                      \
+		WP_HASH_TABLE_DEFAULT_HASHER,                                                                  \
+		U8_STREAM_ENCODER,                                                                             \
+		ITEM_EQ_TEST,                                                                                  \
+		wpArrayWithCapacity(TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),            \
+		NULL,                                                                                          \
+		wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_FILLED),  \
+		WP_HASH_TABLE_MAGIC,                                                                           \
+		wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                                       \
+		0.0f,                                                                                          \
+		false,                                                                                         \
+	})
+#define wpHashSetCustomHasher(TYPE, HASHER, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY)             \
+	(WpHashSet{                                                                                      \
+		HASHER,                                                                                        \
+		U8_STREAM_ENCODER,                                                                             \
+		ITEM_EQ_TEST,                                                                                  \
+		wpArrayWithCapacity(TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_NONE),            \
+		NULL,                                                                                          \
+		wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY), WP_ARRAY_INIT_FILLED),  \
+		WP_HASH_TABLE_MAGIC,                                                                           \
+		wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                                       \
+		0.0f,                                                                                          \
+		false,                                                                                         \
+	})
+#else
+#define wpHashSet(TYPE, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY)                                 \
+	((WpHashSet){                                                                                    \
+		.hasher      = WP_HASH_TABLE_DEFAULT_HASHER,                                                   \
+		.encoder     = U8_STREAM_ENCODER,                                                              \
+		.key_eq      = ITEM_EQ_TEST,                                                                   \
+		.keys        = wpArrayWithCapacity(TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),                  \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.buckets     = wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY),          \
+		                                   WP_ARRAY_INIT_FILLED),                                      \
+		.magic       = WP_HASH_TABLE_MAGIC,                                                            \
+		.bucket_mask = wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                        \
+	})
+#define wpHashSetCustomHasher(TYPE, HASHER, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY)             \
+	((WpHashSet){                                                                                    \
+		.hasher      = HASHER,                                                                         \
+		.encoder     = U8_STREAM_ENCODER,                                                              \
+		.key_eq      = ITEM_EQ_TEST,                                                                   \
+		.keys        = wpArrayWithCapacity(TYPE, wpMiscUtilsU64RoundUpPow2(CAPACITY),                  \
+		                                   WP_ARRAY_INIT_NONE),                                        \
+		.buckets     = wpArrayWithCapacity(WpHashBucket, wpMiscUtilsU64RoundUpPow2(CAPACITY),          \
+		                                   WP_ARRAY_INIT_FILLED),                                      \
+		.magic       = WP_HASH_TABLE_MAGIC,                                                            \
+		.bucket_mask = wpMiscUtilsU64RoundUpPow2(CAPACITY) - 1,                                        \
+	})
+#endif
+
+#define wpHashSetAlloc(TYPE, ALLOCATOR_PTR, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY)             \
+	hashSetAlloc(ALLOCATOR_PTR, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY, sizeof(TYPE))
+#define wpHashSetCustomHasherAlloc(TYPE, ALLOCATOR_PTR, HASHER, U8_STREAM_ENCODER, ITEM_EQ_TEST,   \
+                                   CAPACITY)                                                       \
+	hashSetAllocWithCustomHasher(ALLOCATOR_PTR, HASHER, U8_STREAM_ENCODER, ITEM_EQ_TEST, CAPACITY,   \
+	                             sizeof(TYPE))
+#define wpHashSetItems(TYPE, SET_PTR) ((TYPE *)hashTableKeys(SET_PTR, sizeof(TYPE)))
+#define wpHashSetCapacity(SET_PTR) hashTableCapacity(SET_PTR)
+#define wpHashSetCount(SET_PTR) hashTableCount(SET_PTR)
+#define wpHashSetItemSize(SET_PTR) hashTableKeySize(SET_PTR)
+#define wpHashSetFind(TYPE, SET_PTR, ITEM_PTR) hashSetFind(SET_PTR, ITEM_PTR, sizeof(TYPE))
+#define wpHashSetInsertCapped(TYPE, SET_PTR, ITEM_PTR)                                             \
+	hashSetInsertCapped(SET_PTR, ITEM_PTR, sizeof(TYPE))
+#define wpHashSetInsertAlloc(TYPE, ALLOCATOR_PTR, SET_PTR, ITEM_PTR)                               \
+	hashSetInsertAlloc(ALLOCATOR_PTR, SET_PTR, ITEM_PTR, sizeof(TYPE))
+#define wpHashSetRemove(TYPE, SET_PTR, ITEM_PTR) hashSetRemove(SET_PTR, ITEM_PTR, sizeof(TYPE))
+#define wpHashSetClear(TYPE, SET_PTR) hashTableClear(SET_PTR, sizeof(TYPE), 0)
+#define wpHashSetDealloc(TYPE, ALLOCATOR_PTR, SET_PTR)                                             \
+	hashTableDealloc(ALLOCATOR_PTR, SET_PTR, sizeof(TYPE), 0)
+
+WpHashSet          hashSetAlloc(const WpAllocator *allocator, WpU8StreamEncoder encoder,
+                                WpKeyEqualTest key_eq, u64 capacity, u64 key_size);
+WpHashSet          hashSetAllocWithCustomHasher(const WpAllocator *allocator, WpHasher hasher,
+                                                WpU8StreamEncoder encoder, WpKeyEqualTest key_eq,
+                                                u64 capacity, u64 key_size);
+WpHashLookupResult hashSetFind(WpHashSet *set, void *item, u64 item_size);
+void               hashSetInsertCapped(WpHashSet *set, void *item, u64 item_size);
+void               hashSetInsertAlloc(const WpAllocator *allocator, WpHashSet *set, void *item,
+                                      u64 item_size);
+void               hashSetRemove(WpHashSet *set, void *item, u64 item_size);
+
+#ifdef WP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#endif // !SET_H

src/base/hash/table/table.c

@@ -0,0 +1,292 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "table.h"
+#include "../hasher/hasher.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include "../../stream/stream.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/assert/assert.h"
+#include "../../../common/misc/misc_utils.h"
+
+wp_persist inline void *hashTableGetKeyFromBucket(WpHashTable *table, WpHashBucket bucket, u64 key_size);
+wp_persist inline void *hashTableGetValueFromBucket(WpHashTable *table, WpHashBucket bucket, u64 value_size);
+wp_persist inline u64   hashTableGetDist(u64 dist_and_tag);
+wp_persist inline u64   hashTableNextBucket(WpHashTable *table, u64 bucket_index);
+wp_persist inline u64   hashTableDistInc(u64 dist_and_tag);
+wp_persist inline u64   hashTableDistDec(u64 dist_and_tag);
+wp_persist inline void  hashTableValidate(const WpHashTable *table, u64 key_size, u64 value_size);
+
+void hashTableAlloc(const WpAllocator *allocator, WpHashTable *table, WpHasher hasher,
+                    WpU8StreamEncoder encoder, WpKeyEqualTest key_eq, u64 capacity, u64 key_size,
+                    u64 value_size, b8 has_values) {
+	wpDebugAssert(allocator != NULL && table != NULL && encoder != NULL && key_eq != NULL,
+	              "`allocator`, `table`, `encoder` and `key_eq` should not be NULL");
+
+	u64 table_capacity = wpMiscUtilsU64RoundUpPow2(capacity);
+	table->hasher      = hasher;
+	table->encoder     = encoder;
+	table->key_eq      = key_eq;
+	table->keys        = arrayAllocCapacity(allocator, table_capacity, WP_ARRAY_INIT_NONE, key_size);;
+	table->buckets     = wpArrayAllocCapacity(WpHashBucket, allocator, table_capacity, WP_ARRAY_INIT_FILLED);
+	table->magic       = WP_HASH_TABLE_MAGIC;
+	table->bucket_mask = table_capacity - 1;
+	table->load_factor = WP_HASH_MAX_LOAD_FACTOR;
+	table->has_values  = has_values;
+
+	wpRuntimeAssert(table->keys != NULL && table->buckets != NULL, "Failed to allocate keys, buckets or both");
+
+	if (has_values) {
+		table->values = arrayAllocCapacity(allocator, table_capacity, WP_ARRAY_INIT_NONE, value_size);;
+		wpRuntimeAssert(table->values != NULL, "Failed to allocate values");
+	}
+}
+
+u64 hashTableCalcHash(WpHashTable *table, void *key, u64 key_size) {
+	hashTableValidate(table, key_size, 0);
+	wpDebugAssert(key != NULL, "`key` should not be NULL");
+	WpU8Stream stream = table->encoder(key);
+	return wpHasherGetHash64(&table->hasher, &stream);
+}
+
+WpHashBucketRef hashTableBucketRef(WpHashTable *table, u64 hash) {
+	hashTableValidate(table, 0, 0);
+	return (WpHashBucketRef){
+		.dist_and_tag = WP_HASH_DIST_INC | (hash & WP_HASH_TAG_MASK),
+		.bucket_index = hash & table->bucket_mask,
+	};
+}
+
+void *hashTableKeys(WpHashTable *table, u64 key_size) {
+	hashTableValidate(table, key_size, 0);
+	return table->keys;
+}
+
+void *hashTableValues(WpHashTable *table, u64 value_size) {
+	hashTableValidate(table, 0, value_size);
+	return table->values;
+}
+
+void *hashTableGetKeyFromBucketRef(WpHashTable *table, WpHashBucketRef ref, u64 key_size) {
+	return hashTableGetKeyFromBucket(table, table->buckets[ref.bucket_index], key_size);
+}
+
+void *hashTableGetValueFromBucketRef(WpHashTable *table, WpHashBucketRef ref, u64 value_size) {
+	return hashTableGetValueFromBucket(table, table->buckets[ref.bucket_index], value_size);
+}
+
+u64 hashTableCapacity(WpHashTable *table) {
+	hashTableValidate(table, 0, 0);
+	return wpArrayCapacity(table->keys);
+}
+
+u64 hashTableCount(WpHashTable *table) {
+	hashTableValidate(table, 0, 0);
+	return wpArrayCount(table->keys);
+}
+
+u64 hashTableKeySize(WpHashTable *table) {
+	hashTableValidate(table, 0, 0);
+	return wpArrayItemSize(table->keys);
+}
+
+u64 hashTableValueSize(WpHashTable *table) {
+	hashTableValidate(table, 0, 0);
+	return table->has_values ? wpArrayItemSize(table->values) : 0;
+}
+
+void hashTableGrow(const WpAllocator *allocator, WpHashTable *table, u64 key_size, u64 value_size) {
+	hashTableValidate(table, key_size, value_size);
+	wpDebugAssert(allocator != NULL, "`allocator` should not be NULL");
+
+	u64 capacity              = wpMiscUtilsU64RoundUpPow2(hashTableCapacity(table) * 2); 
+	u64 mask                  = capacity - wpU64Const(1);
+	WpArray keys              = arrayAllocCapacity(allocator, capacity, WP_ARRAY_INIT_NONE, key_size);
+	WpArray values            = NULL;
+	WpHashBucketArray buckets = wpArrayAllocCapacity(WpHashBucket, allocator, capacity, WP_ARRAY_INIT_FILLED);
+
+	wpRuntimeAssert(keys != NULL && buckets != NULL, "Failed to allocate keys, buckets or both");
+
+	if (table->has_values) {
+		values = arrayAllocCapacity(allocator, capacity, WP_ARRAY_INIT_NONE, value_size);
+		wpRuntimeAssert(values != NULL, "Failed to allocate values");
+	}
+
+	WpArray old_keys   = table->keys;
+	WpArray old_values = table->values;
+
+	table->keys        = keys;
+	table->values      = values;
+	table->buckets     = buckets;
+	table->bucket_mask = mask;
+
+	for (u64 i = 0; i < wpArrayCount(old_keys); ++i) {
+		void *key           = arrayGet(old_keys, i, key_size);
+		void *value         = table->has_values ? arrayGet(old_values, i, value_size) : NULL;
+		u64 hash            = hashTableCalcHash(table, key, key_size);
+		WpHashBucketRef ref = hashTableBucketRef(table, hash);
+		hashTableInsert(table, key, value, ref, key_size, value_size);
+	}
+}
+
+WpHashLookupResult hashTableLookup(WpHashTable *table, void *key, WpHashBucketRef ref, u64 key_size) {
+	hashTableValidate(table, key_size, 0);
+	wpDebugAssert(key != NULL, "`key` should not be NULL");
+
+	while (true) {
+		WpHashBucket *bucket = &table->buckets[ref.bucket_index];
+
+		if (ref.dist_and_tag == bucket->dist_and_tag) {
+			b8 key_equal = table->key_eq(key, arrayGet(table->keys, bucket->item_index, key_size));
+			return (WpHashLookupResult){
+				.ref.dist_and_tag = ref.dist_and_tag,
+				.ref.bucket_index = ref.bucket_index,
+				.found            = key_equal,
+			};
+		} else if (hashTableGetDist(ref.dist_and_tag) > hashTableGetDist(bucket->dist_and_tag)) {
+			return (WpHashLookupResult){
+				.ref.dist_and_tag = ref.dist_and_tag,
+				.ref.bucket_index = ref.bucket_index,
+				.found            = false,
+			};
+		}
+
+		ref.dist_and_tag = hashTableDistInc(ref.dist_and_tag);
+		ref.bucket_index = hashTableNextBucket(table, ref.bucket_index);
+	}
+}
+
+void hashTableUpdate(WpHashTable *table, void *value, WpHashBucketRef ref, u64 value_size) {
+	hashTableValidate(table, 0, value_size);
+	if (!(table->has_values)) {
+		wpRuntimeAssert(0, "Attempting to update a hash table that has no values");
+	}
+	wpDebugAssert(value != NULL, "`value` should not be NULL");
+
+	WpHashBucket *bucket = &table->buckets[ref.bucket_index];
+	arraySet(table->values, bucket->item_index, value, value_size);
+}
+
+void hashTableInsert(WpHashTable *table, void *key, void *value, WpHashBucketRef ref, u64 key_size,
+                     u64 value_size) {
+	hashTableValidate(table, key_size, value_size);
+	wpDebugAssert(key != NULL, "`key` should not be NULL");
+
+	u64 index = wpArrayCount(table->keys);
+	while (true) {
+		WpHashBucket *bucket = &table->buckets[ref.bucket_index];
+
+		if (bucket->dist_and_tag == 0) {
+			bucket->dist_and_tag = ref.dist_and_tag;
+			bucket->item_index   = index;
+			break;
+		} else if (hashTableGetDist(ref.dist_and_tag) > hashTableGetDist(bucket->dist_and_tag)) {
+			wpMiscUtilsSwap(u64, &ref.dist_and_tag, &bucket->dist_and_tag);
+			wpMiscUtilsSwap(u64, &index, &bucket->item_index);
+		}
+
+		ref.dist_and_tag = hashTableDistInc(ref.dist_and_tag);
+		ref.bucket_index = hashTableNextBucket(table, ref.bucket_index);
+	}
+
+	arrayAppendCapped(table->keys, key, key_size);
+	if (table->has_values) {
+		arrayAppendCapped(table->values, value, value_size);
+	}
+	table->load_factor = (f32)wpArrayCount(table->keys) / (f32)wpArrayCapacity(table->keys);
+}
+
+void hashTableRemove(WpHashTable *table, WpHashBucketRef ref, u64 key_size, u64 value_size) {
+	hashTableValidate(table, key_size, value_size);
+
+	WpHashBucket *bucket = &table->buckets[ref.bucket_index];
+
+	u64 last_item_index = wpArrayCount(table->keys) - 1;
+
+	if (bucket->item_index < last_item_index) {
+		// Update the bucket for the last item before swapping
+		u64 hash = hashTableCalcHash(table, arrayGet(table->keys, last_item_index, key_size), key_size);
+
+		WpHashLookupResult result = hashTableLookup(table, arrayGet(table->keys, last_item_index, key_size),
+		                                            hashTableBucketRef(table, hash), key_size);
+		wpRuntimeAssert(result.found, "Hash table item should exist but it doesn't");
+
+		table->buckets[result.ref.bucket_index].item_index = bucket->item_index;
+
+		arrayRemoveSwapEnd(table->keys, bucket->item_index, key_size);
+		if (table->has_values) {
+			arrayRemoveSwapEnd(table->values, bucket->item_index, value_size);
+		}
+	}
+
+	while (bucket->dist_and_tag > 0) {
+		u64 next_index     = hashTableNextBucket(table, ref.bucket_index);
+		WpHashBucket *next = &table->buckets[next_index];
+
+		if (hashTableGetDist(next->dist_and_tag) > WP_HASH_DIST_INC) {
+			bucket->dist_and_tag = hashTableDistDec(next->dist_and_tag);
+			bucket->item_index   = next->item_index;
+
+			ref.bucket_index = next_index;
+			bucket           = &table->buckets[ref.bucket_index];
+		} else {
+			bucket->dist_and_tag = 0;
+			bucket->item_index   = 0;
+		}
+	}
+}
+
+void hashTableClear(WpHashTable *table, u64 key_size, u64 value_size) {
+	hashTableValidate(table, key_size, value_size);
+	arrayClear(table->keys, key_size);
+	if (table->has_values) {
+		arrayClear(table->values, value_size);
+	}
+	wpArrayZero(WpHashBucket, table->buckets);
+}
+
+void hashTableDealloc(const WpAllocator *allocator, WpHashTable *table, u64 key_size, u64 value_size) {
+	wpDebugAssert(allocator != NULL, "`allocator` should not be NULL");
+	hashTableValidate(table, key_size, value_size);
+	arrayDealloc(allocator, table->keys, key_size);
+	wpArrayDealloc(WpHashBucket, allocator, table->buckets);
+	if (table->has_values) {
+		arrayDealloc(allocator, table->values, value_size);
+	}
+}
+
+wp_persist inline void *hashTableGetKeyFromBucket(WpHashTable *table, WpHashBucket bucket, u64 key_size) {
+	hashTableValidate(table, key_size, 0);
+	return arrayGet(table->keys, bucket.item_index, key_size);
+}
+
+wp_persist inline void *hashTableGetValueFromBucket(WpHashTable *table, WpHashBucket bucket, u64 value_size) {
+	hashTableValidate(table, 0, value_size);
+	return table->has_values ? arrayGet(table->values, bucket.item_index, value_size) : NULL;
+}
+
+wp_persist inline u64 hashTableGetDist(u64 dist_and_tag) {
+	return dist_and_tag & (~WP_HASH_TAG_MASK);
+}
+
+wp_persist inline u64 hashTableNextBucket(WpHashTable *table, u64 bucket_index) {
+	return (++bucket_index) & table->bucket_mask;
+}
+
+wp_persist inline u64 hashTableDistInc(u64 dist_and_tag) {
+	return dist_and_tag + WP_HASH_DIST_INC;
+}
+
+wp_persist inline u64 hashTableDistDec(u64 dist_and_tag) {
+	return dist_and_tag - WP_HASH_DIST_INC;
+}
+
+wp_persist inline void hashTableValidate(const WpHashTable *table, u64 key_size, u64 value_size) {
+	wpDebugAssert(table != NULL, "`table` should not be NULL");
+	wpRuntimeAssert(WP_HASH_TABLE_MAGIC == table->magic, "`table` is not a valid wapp hash table");
+	if (key_size > 0) {
+		wpRuntimeAssert(key_size == wpArrayItemSize(table->keys), "Invalid key type provided");
+	}
+	if (value_size > 0) {
+		wpRuntimeAssert(value_size == wpArrayItemSize(table->values), "Invalid value type provided");
+	}
+}

src/base/hash/table/table.h

@@ -0,0 +1,101 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+/**
+ * A hash table implementation with Robin Hood open addressing for collision resolution.
+ *
+ * The implementation is based on a version of this C++ implementation:
+ * https://github.com/martinus/unordered_dense
+ *
+ * Extra references:
+ * - https://faultlore.com/blah/robinhood-part-1/
+ * - https://blog.hieunt.me/blog/robinhood-hashing
+ *
+ * IMPORTANT:
+ * This is the internal hash table implementation and it is not intended to be used directly.
+ * Please check ../map/map.h and ../set/set.h for the public APIs.
+ */
+
+#ifndef TABLE_H
+#define TABLE_H
+
+#include "../hasher/hasher.h"
+#include "../hasher/murmur3.h"
+#include "../../array/array.h"
+#include "../../mem/allocator/mem_allocator.h"
+#include "../../stream/stream.h"
+#include "../../../common/aliases/aliases.h"
+#include "../../../common/platform/platform.h"
+
+#ifdef WP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#define WP_HASH_TABLE_MAGIC          wpU64Const(0x57504854424c)
+#define WP_HASH_TAG_BITS             wpU64Const(32)
+#define WP_HASH_DIST_INC             (wpU64Const(1) << WP_HASH_TAG_BITS)
+#define WP_HASH_TAG_MASK             (WP_HASH_DIST_INC - wpU64Const(1))
+#define WP_HASH_MAX_LOAD_FACTOR      0.65f
+#define WP_HASH_TABLE_DEFAULT_HASHER wpX64Mur3Hasher()
+
+typedef WpU8Stream (*WpU8StreamEncoder)(void *data);
+typedef b8 (*WpKeyEqualTest)(void *a, void *b);
+
+typedef struct WpHashBucket {
+	u64 dist_and_tag;
+	u64 item_index;
+} WpHashBucket;
+typedef WpHashBucket *WpHashBucketArray;
+
+typedef struct WpHashTable {
+	WpHasher          hasher;
+	WpU8StreamEncoder encoder;
+	WpKeyEqualTest    key_eq;
+	WpArray           keys;
+	WpArray           values;
+	WpHashBucketArray buckets;
+	u64               magic;
+	u64               bucket_mask;
+	f32               load_factor;
+	b8                has_values;
+} WpHashTable;
+
+typedef struct WpHashBucketRef {
+	u64 dist_and_tag;
+	u64 bucket_index;
+} WpHashBucketRef;
+
+typedef struct WpHashLookupResult {
+	WpHashBucketRef ref;
+	b8              found;
+} WpHashLookupResult;
+
+void               hashTableAlloc(const WpAllocator *allocator, WpHashTable *table,
+                                  WpHasher hasher, WpU8StreamEncoder encoder,
+                                  WpKeyEqualTest key_eq, u64 capacity, u64 key_size,
+                                  u64 value_size, b8 has_values);
+u64                hashTableCalcHash(WpHashTable *table, void *key, u64 key_size);
+WpHashBucketRef    hashTableBucketRef(WpHashTable *table, u64 hash);
+void              *hashTableKeys(WpHashTable *table, u64 key_size);
+void              *hashTableValues(WpHashTable *table, u64 value_size);
+void              *hashTableGetKeyFromBucketRef(WpHashTable *table, WpHashBucketRef ref, u64 key_size);
+void              *hashTableGetValueFromBucketRef(WpHashTable *table, WpHashBucketRef ref, u64 value_size);
+u64                hashTableCapacity(WpHashTable *table);
+u64                hashTableCount(WpHashTable *table);
+u64                hashTableKeySize(WpHashTable *table);
+u64                hashTableValueSize(WpHashTable *table);
+void               hashTableGrow(const WpAllocator *allocator, WpHashTable *table, u64 key_size,
+                                 u64 value_size);
+WpHashLookupResult hashTableLookup(WpHashTable *table, void *key, WpHashBucketRef ref, u64 key_size);
+void               hashTableUpdate(WpHashTable *table, void *value, WpHashBucketRef ref, u64 value_size);
+void               hashTableInsert(WpHashTable *table, void *key, void *value, WpHashBucketRef ref,
+                                   u64 key_size, u64 value_size);
+void               hashTableRemove(WpHashTable *table, WpHashBucketRef ref, u64 key_size, u64 value_size);
+void               hashTableClear(WpHashTable *table, u64 key_size, u64 value_size);
+void               hashTableDealloc(const WpAllocator *allocator, WpHashTable *table, u64 key_size,
+                                    u64 value_size);
+
+#ifdef WP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WP_PLATFORM_CPP
+
+#endif // !TABLE_H

src/base/wapp_base.c

@@ -9,6 +9,9 @@
 #include "hash/hasher/hasher.c"
 #include "hash/hasher/murmur3.c"
 #include "hash/hasher/siphash.c"
+#include "hash/table/table.c"
+#include "hash/set/set.c"
+#include "hash/map/map.c"
 #include "queue/queue.c"
 #include "stream/stream.c"
 #include "mem/allocator/mem_allocator.c"

src/base/wapp_base.h

@@ -8,6 +8,9 @@
 #include "hash/hasher/hasher.h"
 #include "hash/hasher/murmur3.h"
 #include "hash/hasher/siphash.h"
+#include "hash/table/table.h"
+#include "hash/set/set.h"
+#include "hash/map/map.h"
 #include "queue/queue.h"
 #include "stream/stream.h"
 #include "mem/allocator/mem_allocator.h"

src/common/misc/misc_utils.h

@@ -31,24 +31,29 @@ BEGIN_C_LINKAGE
 #define U64_RSHIFT_OR_8(X)  (((u64)X) | (((u64)X) >> 8))
 #define U64_RSHIFT_OR_16(X) (((u64)X) | (((u64)X) >> 16))
 #define U64_RSHIFT_OR_32(X) (((u64)X) | (((u64)X) >> 32))
-#define wpMiscUtilsU64RoundUpPow2(X) (         \
-	(                                            \
-		U64_RSHIFT_OR_32(                          \
-			U64_RSHIFT_OR_16(                        \
-				U64_RSHIFT_OR_8(                       \
-					U64_RSHIFT_OR_4(                     \
-						U64_RSHIFT_OR_2(                   \
-							U64_RSHIFT_OR_1(X - 1)           \
-						)                                  \
-					)                                    \
-				)                                      \
-			)                                        \
-		)                                          \
-	) + 1                                        \
+#define wpMiscUtilsU64RoundUpPow2(X) (                                                             \
+	(                                                                                                \
+		U64_RSHIFT_OR_32(                                                                              \
+			U64_RSHIFT_OR_16(                                                                            \
+				U64_RSHIFT_OR_8(                                                                           \
+					U64_RSHIFT_OR_4(                                                                         \
+						U64_RSHIFT_OR_2(                                                                       \
+							U64_RSHIFT_OR_1(X - 1)                                                               \
+						)                                                                                      \
+					)                                                                                        \
+				)                                                                                          \
+			)                                                                                            \
+		)                                                                                              \
+	) + 1                                                                                            \
 )
 
 #define wpMiscUtilsIsPowerOfTwo(NUM) ((NUM & (NUM - 1)) == 0)
 #define wpMiscUtilsOffsetPointer(PTR, OFFSET) ((void *)((uptr)(PTR) + (OFFSET)))
+#define wpMiscUtilsSwap(TYPE, A_PTR, B_PTR) do {                                                   \
+	TYPE tmp = *(A_PTR);                                                                             \
+	*(A_PTR) = *(B_PTR);                                                                             \
+	*(B_PTR) = tmp;                                                                                  \
+} while(0)
 
 wp_intern inline u64 wpMiscUtilsRotl64(u64 x, i8 rotation) {
   return (x << rotation) | (x >> (64 - rotation));

tests/hasher/test_hasher.c

@@ -12,7 +12,7 @@ WpTestFuncResult test_murmur3(void) {
 	WpI32Array arr = wpArray(i32, 1, 2, 3, 4, 5);
 	u64 num        = 287324;
 
-	WpMur3HasherData data = wpMur3HasherData(873923);
+	WpHasher hasher = wpX64Mur3HasherWithSeed(873923);
 
 	WpU8Stream str_bytes = wpStream(u8, str.buf, str.size);
 	WpU8Stream arr_bytes = wpStream(u8, (u8 *)arr, wpArrayCount(arr) * wpArrayItemSize(arr));
@@ -21,22 +21,22 @@ WpTestFuncResult test_murmur3(void) {
 	u64 hash[2] = {0};
 
 	// Sring hash
-	WpU128Hash mur_hash = wpX64Mur3Hasher128(&str_bytes, (void *)&data);
-	MurmurHash3_x64_128(str_bytes.data, str_bytes.count * str_bytes.item_size, data.seed, (void *)hash);
+	WpU128 mur_hash = hasher.func(&str_bytes, hasher.ctx);
+	MurmurHash3_x64_128(str_bytes.data, str_bytes.count * str_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	// Array hash
-	mur_hash = wpX64Mur3Hasher128(&arr_bytes, (void *)&data);
-	MurmurHash3_x64_128(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, data.seed, (void *)hash);
+	mur_hash = hasher.func(&arr_bytes, hasher.ctx);
+	MurmurHash3_x64_128(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	// Number hash
-	mur_hash = wpX64Mur3Hasher128(&num_bytes, (void *)&data);
-	MurmurHash3_x64_128(num_bytes.data, num_bytes.count * num_bytes.item_size, data.seed, (void *)hash);
+	mur_hash = hasher.func(&num_bytes, hasher.ctx);
+	MurmurHash3_x64_128(num_bytes.data, num_bytes.count * num_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	return wpTesterResult(result);
 }
@@ -48,8 +48,8 @@ WpTestFuncResult test_siphash_128(void) {
 	WpI32Array arr = wpArray(i32, 1, 2, 3, 4, 5);
 	u64 num        = 287324;
 
-	WpSipHasherKey key   = { .lo = 238742, .hi = 671734 };
-	WpSipHasherData data = wpSip24HasherData(key);
+	WpU128 key      = { .value = { 238742, 671734 } };
+	WpHasher hasher = wpSip24HasherWithKey(key);
 
 	WpU8Stream str_bytes = wpStream(u8, str.buf, str.size);
 	WpU8Stream arr_bytes = wpStream(u8, (u8 *)arr, wpArrayCount(arr) * wpArrayItemSize(arr));
@@ -58,25 +58,25 @@ WpTestFuncResult test_siphash_128(void) {
 	u64 hash[2] = {0};
 
 	// Sring hash
-	WpU128Hash sip_hash = wpSipHasher128(&str_bytes, (void *)&data);
-	siphash(str_bytes.data, str_bytes.count * str_bytes.item_size, (void *)&data.key,
+	WpU128 sip_hash = hasher.func(&str_bytes, hasher.ctx);
+	siphash(str_bytes.data, str_bytes.count * str_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	// Array hash
-	sip_hash = wpSipHasher128(&arr_bytes, (void *)&data);
-	siphash(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, (void *)&data.key,
+	sip_hash = hasher.func(&arr_bytes, hasher.ctx);
+	siphash(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	// Number hash
-	sip_hash = wpSipHasher128(&num_bytes, (void *)&data);
-	siphash(num_bytes.data, num_bytes.count * num_bytes.item_size, (void *)&data.key,
+	sip_hash = hasher.func(&num_bytes, hasher.ctx);
+	siphash(num_bytes.data, num_bytes.count * num_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	return wpTesterResult(result);
 }

tests/hasher/test_hasher.cc

@@ -12,7 +12,7 @@ WpTestFuncResult test_murmur3(void) {
 	WpI32Array arr = wpArray(i32, 1, 2, 3, 4, 5);
 	u64 num        = 287324;
 
-	WpMur3HasherData data = wpMur3HasherData(873923);
+	WpHasher hasher = wpX64Mur3HasherWithSeed(873923);
 
 	WpU8Stream str_bytes = wpStream(u8, str.buf, str.size);
 	WpU8Stream arr_bytes = wpStream(u8, (u8 *)arr, wpArrayCount(arr) * wpArrayItemSize(arr));
@@ -21,22 +21,22 @@ WpTestFuncResult test_murmur3(void) {
 	u64 hash[2] = {0};
 
 	// Sring hash
-	WpU128Hash mur_hash = wpX64Mur3Hasher128(&str_bytes, (void *)&data);
-	MurmurHash3_x64_128(str_bytes.data, str_bytes.count * str_bytes.item_size, data.seed, (void *)hash);
+	WpU128 mur_hash = hasher.func(&str_bytes, hasher.ctx);
+	MurmurHash3_x64_128(str_bytes.data, str_bytes.count * str_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	// Array hash
-	mur_hash = wpX64Mur3Hasher128(&arr_bytes, (void *)&data);
-	MurmurHash3_x64_128(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, data.seed, (void *)hash);
+	mur_hash = hasher.func(&arr_bytes, hasher.ctx);
+	MurmurHash3_x64_128(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	// Number hash
-	mur_hash = wpX64Mur3Hasher128(&num_bytes, (void *)&data);
-	MurmurHash3_x64_128(num_bytes.data, num_bytes.count * num_bytes.item_size, data.seed, (void *)hash);
+	mur_hash = hasher.func(&num_bytes, hasher.ctx);
+	MurmurHash3_x64_128(num_bytes.data, num_bytes.count * num_bytes.item_size, hasher.ctx.murmur3, (void *)hash);
 
-	result = result && mur_hash.hash[0] == hash[0] && mur_hash.hash[1] == hash[1];
+	result = result && mur_hash.value[0] == hash[0] && mur_hash.value[1] == hash[1];
 
 	return wpTesterResult(result);
 }
@@ -48,8 +48,8 @@ WpTestFuncResult test_siphash_128(void) {
 	WpI32Array arr = wpArray(i32, 1, 2, 3, 4, 5);
 	u64 num        = 287324;
 
-	WpSipHasherKey key   = { 238742, 671734 };
-	WpSipHasherData data = wpSip24HasherData(key);
+	WpU128 key      = { { 238742, 671734 } };
+	WpHasher hasher = wpSip24HasherWithKey(key);
 
 	WpU8Stream str_bytes = wpStream(u8, str.buf, str.size);
 	WpU8Stream arr_bytes = wpStream(u8, (u8 *)arr, wpArrayCount(arr) * wpArrayItemSize(arr));
@@ -58,25 +58,25 @@ WpTestFuncResult test_siphash_128(void) {
 	u64 hash[2] = {0};
 
 	// Sring hash
-	WpU128Hash sip_hash = wpSipHasher128(&str_bytes, (void *)&data);
-	siphash(str_bytes.data, str_bytes.count * str_bytes.item_size, (void *)&data.key,
+	WpU128 sip_hash = hasher.func(&str_bytes, hasher.ctx);
+	siphash(str_bytes.data, str_bytes.count * str_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	// Array hash
-	sip_hash = wpSipHasher128(&arr_bytes, (void *)&data);
-	siphash(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, (void *)&data.key,
+	sip_hash = hasher.func(&arr_bytes, hasher.ctx);
+	siphash(arr_bytes.data, arr_bytes.count * arr_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	// Number hash
-	sip_hash = wpSipHasher128(&num_bytes, (void *)&data);
-	siphash(num_bytes.data, num_bytes.count * num_bytes.item_size, (void *)&data.key,
+	sip_hash = hasher.func(&num_bytes, hasher.ctx);
+	siphash(num_bytes.data, num_bytes.count * num_bytes.item_size, (void *)&hasher.ctx.siphash.key,
 	        (u8 *)hash, sizeof(u64) * 2);
 
-	result = result && sip_hash.hash[0] == hash[0] && sip_hash.hash[1] == hash[1];
+	result = result && sip_hash.value[0] == hash[0] && sip_hash.value[1] == hash[1];
 
 	return wpTesterResult(result);
 }

tests/hashmap/test_hashmap.c

@@ -0,0 +1,266 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "wapp.h"
+#include "test_hashmap.h"
+
+wp_persist inline WpU8Stream encoder(void *data);
+wp_persist inline b8 key_eq(void *a, void *b);
+
+WpTestFuncResult test_hashmap(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 0;
+	map           = wpHashMap(WpStr8, i32, encoder, key_eq, 3);
+	result        = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 0;
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMapAlloc(WpStr8, i32, &arena, encoder, key_eq, 8);
+	result            = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 0;
+	map               = wpHashMapAlloc(WpStr8, i32, &arena, encoder, key_eq, 3);
+	result            = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 0;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_get_key_size(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapKeySize(&map) == sizeof(WpStr8);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_get_value_size(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapValueSize(&map) == sizeof(i32);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_find(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	WpHashLookupResult res = wpHashMapFind(WpStr8, &map, &keys[3]);
+
+	result = result && res.found && res.ref.dist_and_tag > 0;
+
+	WpStr8 key = wpStr8Lit("key0");
+	res        = wpHashMapFind(WpStr8, &map, &key);
+	result     = result && !res.found;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_update(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapUpdate(WpStr8, i32, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_capped(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(wpArrayGet(WpStr8, map.keys, i), &keys[i]);
+	}
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_or_update_capped(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertOrUpdateCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapInsertOrUpdateCapped(WpStr8, i32, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys  = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	WpStr8Array map_keys = map.keys;
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertAlloc(WpStr8, i32, &arena, &map, &keys[i], &values[i]);
+	}
+
+	result = result && map.keys != map_keys && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]) &&
+		         wpHashMapValues(i32, &map)[i] == values[i];
+	}
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_or_update_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys  = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertOrUpdateAlloc(WpStr8, i32, &arena, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapInsertOrUpdateAlloc(WpStr8, i32, &arena, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_remove(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	wpHashMapRemove(WpStr8, i32, &map, &keys[0]);
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 2;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_clear(void) {
+	b8 result        = true;
+	WpHashMap map    = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	wpHashMapClear(WpStr8, i32, &map);
+
+	result = result && wpHashMapCount(&map) == 0;
+
+	return wpTesterResult(result);
+}
+
+wp_persist inline WpU8Stream encoder(void *data) {
+	WpStr8 *str = (WpStr8 *)data;
+	return wpStream(u8, str->buf, str->size);
+}
+
+wp_persist inline b8 key_eq(void *a, void *b) {
+	WpStr8 *a_str = (WpStr8 *)a;
+	WpStr8 *b_str = (WpStr8 *)b;
+	return wpStr8Equal(a_str, b_str);
+}

tests/hashmap/test_hashmap.cc

@@ -0,0 +1,250 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "wapp.h"
+#include "test_hashmap.h"
+
+wp_persist inline WpU8Stream encoder(void *data);
+wp_persist inline b8 key_eq(void *a, void *b);
+
+WpTestFuncResult test_hashmap(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 0;
+	map           = wpHashMap(WpStr8, i32, encoder, key_eq, 3);
+	result        = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 0;
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMapAlloc(WpStr8, i32, &arena, encoder, key_eq, 8);
+	result            = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 0;
+	map               = wpHashMapAlloc(WpStr8, i32, &arena, encoder, key_eq, 3);
+	result            = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 0;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_get_key_size(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapKeySize(&map) == sizeof(WpStr8);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_get_value_size(void) {
+	b8 result     = true;
+	WpHashMap map = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	result        = result && wpHashMapValueSize(&map) == sizeof(i32);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_find(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	WpHashLookupResult res = wpHashMapFind(WpStr8, &map, &keys[3]);
+
+	result = result && res.found && res.ref.dist_and_tag > 0;
+
+	WpStr8 key = wpStr8Lit("key0");
+	res        = wpHashMapFind(WpStr8, &map, &key);
+	result     = result && !res.found;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_update(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapUpdate(WpStr8, i32, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_capped(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(wpArrayGet(WpStr8, map.keys, i), &keys[i]);
+	}
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_or_update_capped(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertOrUpdateCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapInsertOrUpdateCapped(WpStr8, i32, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 3 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	WpStr8Array map_keys = (WpStr8Array)map.keys;
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertAlloc(WpStr8, i32, &arena, &map, &keys[i], &values[i]);
+	}
+
+	result = result && map.keys != map_keys && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]) &&
+		         wpHashMapValues(i32, &map)[i] == values[i];
+	}
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_insert_or_update_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertOrUpdateAlloc(WpStr8, i32, &arena, &map, &keys[i], &values[i]);
+	}
+
+	result = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashMapKeys(WpStr8, &map)[i], &keys[i]);
+	}
+
+	i32 new_value = 0;
+	wpHashMapInsertOrUpdateAlloc(WpStr8, i32, &arena, &map, &keys[1], &new_value);
+	result = result && wpHashMapCapacity(&map) == 8 && wpHashMapCount(&map) == 4 &&
+	         wpHashMapValues(i32, &map)[1] == new_value;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_remove(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	wpHashMapRemove(WpStr8, i32, &map, &keys[0]);
+
+	result = result && wpHashMapCapacity(&map) == 4 && wpHashMapCount(&map) == 2;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashmap_clear(void) {
+	b8 result         = true;
+	WpHashMap map     = wpHashMap(WpStr8, i32, encoder, key_eq, 8);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+	WpI32Array values = wpArray(i32, 1, 2, 3, 4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashMapInsertCapped(WpStr8, i32, &map, &keys[i], &values[i]);
+	}
+
+	wpHashMapClear(WpStr8, i32, &map);
+
+	result = result && wpHashMapCount(&map) == 0;
+
+	return wpTesterResult(result);
+}
+
+wp_persist inline WpU8Stream encoder(void *data) {
+	WpStr8 *str = (WpStr8 *)data;
+	return wpStream(u8, str->buf, str->size);
+}
+
+wp_persist inline b8 key_eq(void *a, void *b) {
+	WpStr8 *a_str = (WpStr8 *)a;
+	WpStr8 *b_str = (WpStr8 *)b;
+	return wpStr8Equal(a_str, b_str);
+}

tests/hashmap/test_hashmap.h

@@ -0,0 +1,21 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef TEST_HASHMAP_H
+#define TEST_HASHMAP_H
+
+#include "wapp.h"
+
+WpTestFuncResult test_hashmap(void);
+WpTestFuncResult test_hashmap_alloc(void);
+WpTestFuncResult test_hashmap_get_key_size(void);
+WpTestFuncResult test_hashmap_get_value_size(void);
+WpTestFuncResult test_hashmap_find(void);
+WpTestFuncResult test_hashmap_update(void);
+WpTestFuncResult test_hashmap_insert_capped(void);
+WpTestFuncResult test_hashmap_insert_or_update_capped(void);
+WpTestFuncResult test_hashmap_insert_alloc(void);
+WpTestFuncResult test_hashmap_insert_or_update_alloc(void);
+WpTestFuncResult test_hashmap_remove(void);
+WpTestFuncResult test_hashmap_clear(void);
+
+#endif // !TEST_HASHMAP_H

tests/hashset/test_hashset.c

@@ -0,0 +1,168 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "wapp.h"
+#include "test_hashset.h"
+
+wp_persist inline WpU8Stream encoder(void *data);
+wp_persist inline b8 key_eq(void *a, void *b);
+
+WpTestFuncResult test_hashset(void) {
+	b8 result     = true;
+	WpHashSet set = wpHashSet(WpStr8, encoder, key_eq, 8);
+	result        = result && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 0;
+	set           = wpHashSet(WpStr8, encoder, key_eq, 3);
+	result        = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 0;
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashSet set     = wpHashSetAlloc(WpStr8, &arena, encoder, key_eq, 8);
+	result            = result && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 0;
+	set               = wpHashSetAlloc(WpStr8, &arena, encoder, key_eq, 3);
+	result            = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 0;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_get_item_size(void) {
+	b8 result     = true;
+	WpHashSet set = wpHashSet(WpStr8, encoder, key_eq, 8);
+	result        = result && wpHashSetItemSize(&set) == sizeof(WpStr8);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_find(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 8);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	WpHashLookupResult res = wpHashSetFind(WpStr8, &set, &keys[3]);
+
+	result = result && res.found && res.ref.dist_and_tag > 0;
+
+	WpStr8 key = wpStr8Lit("key0");
+	res        = wpHashSetFind(WpStr8, &set, &key);
+	result     = result && !res.found;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_insert_capped(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	result = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(&wpHashSetItems(WpStr8, &set)[i], &keys[i]);
+	}
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_insert_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashSet set     = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8Array keys  = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+
+	WpStr8Array set_keys = set.keys;
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertAlloc(WpStr8, &arena, &set, &keys[i]);
+	}
+
+	result = result && set.keys != set_keys && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashSetItems(WpStr8, &set)[i], &keys[i]);
+	}
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_remove(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	wpHashSetRemove(WpStr8, &set, &keys[0]);
+
+	result = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 2;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_clear(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 8);
+	WpStr8Array keys = wpArray(
+		WpStr8,
+		wpStr8Lit("key1"),
+		wpStr8Lit("key2"),
+		wpStr8Lit("key3"),
+		wpStr8Lit("key4")
+	);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	wpHashSetClear(WpStr8, &set);
+
+	result = result && wpHashSetCount(&set) == 0;
+
+	return wpTesterResult(result);
+}
+
+wp_persist inline WpU8Stream encoder(void *data) {
+	WpStr8 *str = (WpStr8 *)data;
+	return wpStream(u8, str->buf, str->size);
+}
+
+wp_persist inline b8 key_eq(void *a, void *b) {
+	WpStr8 *a_str = (WpStr8 *)a;
+	WpStr8 *b_str = (WpStr8 *)b;
+	return wpStr8Equal(a_str, b_str);
+}

tests/hashset/test_hashset.cc

@@ -0,0 +1,158 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "wapp.h"
+#include "test_hashset.h"
+
+wp_persist inline WpU8Stream encoder(void *data);
+wp_persist inline b8 key_eq(void *a, void *b);
+
+WpTestFuncResult test_hashset(void) {
+	b8 result     = true;
+	WpHashSet set = wpHashSet(WpStr8, encoder, key_eq, 8);
+	result        = result && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 0;
+	set           = wpHashSet(WpStr8, encoder, key_eq, 3);
+	result        = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 0;
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashSet set     = wpHashSetAlloc(WpStr8, &arena, encoder, key_eq, 8);
+	result            = result && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 0;
+	set               = wpHashSetAlloc(WpStr8, &arena, encoder, key_eq, 3);
+	result            = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 0;
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_get_item_size(void) {
+	b8 result     = true;
+	WpHashSet set = wpHashSet(WpStr8, encoder, key_eq, 8);
+	result        = result && wpHashSetItemSize(&set) == sizeof(WpStr8);
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_find(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 8);
+	WpStr8 key1      = wpStr8Lit("key1");
+	WpStr8 key2      = wpStr8Lit("key2");
+	WpStr8 key3      = wpStr8Lit("key3");
+	WpStr8 key4      = wpStr8Lit("key4");
+	WpStr8Array keys = wpArray(WpStr8, key1, key2, key3, key4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	WpHashLookupResult res = wpHashSetFind(WpStr8, &set, &keys[3]);
+
+	result = result && res.found && res.ref.dist_and_tag > 0;
+
+	WpStr8 key = wpStr8Lit("key0");
+	res        = wpHashSetFind(WpStr8, &set, &key);
+	result     = result && !res.found;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_insert_capped(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8 key1      = wpStr8Lit("key1");
+	WpStr8 key2      = wpStr8Lit("key2");
+	WpStr8 key3      = wpStr8Lit("key3");
+	WpStr8 key4      = wpStr8Lit("key4");
+	WpStr8Array keys = wpArray(WpStr8, key1, key2, key3, key4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	result = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 3;
+	for (u64 i = 0; i < 3; ++i) {
+		result = result && wpStr8Equal(&wpHashSetItems(WpStr8, &set)[i], &keys[i]);
+	}
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_insert_alloc(void) {
+	WpAllocator arena = wpMemArenaAllocatorInit(KiB(4));
+	b8 result         = true;
+	WpHashSet set     = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8 key1       = wpStr8Lit("key1");
+	WpStr8 key2       = wpStr8Lit("key2");
+	WpStr8 key3       = wpStr8Lit("key3");
+	WpStr8 key4       = wpStr8Lit("key4");
+	WpStr8Array keys  = wpArray(WpStr8, key1, key2, key3, key4);
+
+	WpStr8Array set_keys = (WpStr8Array)set.keys;
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertAlloc(WpStr8, &arena, &set, &keys[i]);
+	}
+
+	result = result && set.keys != set_keys && wpHashSetCapacity(&set) == 8 && wpHashSetCount(&set) == 4;
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		result = result && wpStr8Equal(&wpHashSetItems(WpStr8, &set)[i], &keys[i]);
+	}
+
+	wpMemArenaAllocatorDestroy(&arena);
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_remove(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 4);
+	WpStr8 key1      = wpStr8Lit("key1");
+	WpStr8 key2      = wpStr8Lit("key2");
+	WpStr8 key3      = wpStr8Lit("key3");
+	WpStr8 key4      = wpStr8Lit("key4");
+	WpStr8Array keys = wpArray(WpStr8, key1, key2, key3, key4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	wpHashSetRemove(WpStr8, &set, &keys[0]);
+
+	result = result && wpHashSetCapacity(&set) == 4 && wpHashSetCount(&set) == 2;
+
+	return wpTesterResult(result);
+}
+
+WpTestFuncResult test_hashset_clear(void) {
+	b8 result        = true;
+	WpHashSet set    = wpHashSet(WpStr8, encoder, key_eq, 8);
+	WpStr8 key1      = wpStr8Lit("key1");
+	WpStr8 key2      = wpStr8Lit("key2");
+	WpStr8 key3      = wpStr8Lit("key3");
+	WpStr8 key4      = wpStr8Lit("key4");
+	WpStr8Array keys = wpArray(WpStr8, key1, key2, key3, key4);
+
+	for (u64 i = 0; i < wpArrayCount(keys); ++i) {
+		wpHashSetInsertCapped(WpStr8, &set, &keys[i]);
+	}
+
+	wpHashSetClear(WpStr8, &set);
+
+	result = result && wpHashSetCount(&set) == 0;
+
+	return wpTesterResult(result);
+}
+
+wp_persist inline WpU8Stream encoder(void *data) {
+	WpStr8 *str = (WpStr8 *)data;
+	return wpStream(u8, str->buf, str->size);
+}
+
+wp_persist inline b8 key_eq(void *a, void *b) {
+	WpStr8 *a_str = (WpStr8 *)a;
+	WpStr8 *b_str = (WpStr8 *)b;
+	return wpStr8Equal(a_str, b_str);
+}

tests/hashset/test_hashset.h

@@ -0,0 +1,17 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef TEST_HASHSET_H
+#define TEST_HASHSET_H
+
+#include "wapp.h"
+
+WpTestFuncResult test_hashset(void);
+WpTestFuncResult test_hashset_alloc(void);
+WpTestFuncResult test_hashset_get_item_size(void);
+WpTestFuncResult test_hashset_find(void);
+WpTestFuncResult test_hashset_insert_capped(void);
+WpTestFuncResult test_hashset_insert_alloc(void);
+WpTestFuncResult test_hashset_remove(void);
+WpTestFuncResult test_hashset_clear(void);
+
+#endif // !TEST_HASHSET_H

tests/wapptest.c

@@ -9,6 +9,8 @@
 #include "test_cpath.h"
 #include "test_file.h"
 #include "test_hasher.h"
+#include "test_hashset.h"
+#include "test_hashmap.h"
 #include "test_shell_commander.h"
 #include "wapp.h"
 #include <stdlib.h>
@@ -105,6 +107,26 @@ int main(void) {
 		test_wapp_file_remove,
 		test_murmur3,
 		test_siphash_128,
+		test_hashset,
+		test_hashset_alloc,
+		test_hashset_get_item_size,
+		test_hashset_find,
+		test_hashset_insert_capped,
+		test_hashset_insert_alloc,
+		test_hashset_remove,
+		test_hashset_clear,
+		test_hashmap,
+		test_hashmap_alloc,
+		test_hashmap_get_key_size,
+		test_hashmap_get_value_size,
+		test_hashmap_find,
+		test_hashmap_update,
+		test_hashmap_insert_capped,
+		test_hashmap_insert_or_update_capped,
+		test_hashmap_insert_alloc,
+		test_hashmap_insert_or_update_alloc,
+		test_hashmap_remove,
+		test_hashmap_clear,
 		test_commander_cmd_success,
 		test_commander_cmd_failure,
 		test_commander_cmd_out_buf_success,

tests/wapptest.cc

@@ -9,6 +9,8 @@
 #include "test_cpath.h"
 #include "test_file.h"
 #include "test_hasher.h"
+#include "test_hashset.h"
+#include "test_hashmap.h"
 #include "test_shell_commander.h"
 #include "wapp.h"
 #include <stdlib.h>
@@ -105,6 +107,26 @@ int main(void) {
 		test_wapp_file_remove,
 		test_murmur3,
 		test_siphash_128,
+		test_hashset,
+		test_hashset_alloc,
+		test_hashset_get_item_size,
+		test_hashset_find,
+		test_hashset_insert_capped,
+		test_hashset_insert_alloc,
+		test_hashset_remove,
+		test_hashset_clear,
+		test_hashmap,
+		test_hashmap_alloc,
+		test_hashmap_get_key_size,
+		test_hashmap_get_value_size,
+		test_hashmap_find,
+		test_hashmap_update,
+		test_hashmap_insert_capped,
+		test_hashmap_insert_or_update_capped,
+		test_hashmap_insert_alloc,
+		test_hashmap_insert_or_update_alloc,
+		test_hashmap_remove,
+		test_hashmap_clear,
 		test_commander_cmd_success,
 		test_commander_cmd_failure,
 		test_commander_cmd_out_buf_success,