1
0
Fork 0

Compare commits

...

2 Commits

12 changed files with 277 additions and 121 deletions

View File

@ -1,7 +0,0 @@
12-04-2024 René Huiberts <rhuibertsjr@gmail.com>
Updated: references & documentation
12-04-2024 René Huiberts <rhuibertsjr@gmail.com>
Added: project layout

View File

@ -1,40 +1,93 @@
internal Arena *
arena_initialize(u64 size)
arena_initialize(u64 size, b8 growable)
{
Arena *result = 0;
void *backing_buffer = malloc(size);
void *backing_buffer = platform_memory_reserve(size);
if (backing_buffer != NULL)
{
result = (Arena*) backing_buffer;
platform_memory_commit(backing_buffer, ARENA_INITIAL_COMMIT_SIZE);
result->buffer = backing_buffer;
result->offset = sizeof(Arena);
result->size = sizeof(Arena) + size;
result = (Arena*) backing_buffer;
result->backing_buffer = (u64*) backing_buffer;
result->current = result;
result->prev = 0;
// rhjr: immutable arena header
result->base_pos =
memory_align(sizeof(Arena), ARENA_DEFAULT_ALIGNMENT);
result->offset = result->base_pos;
result->growable = growable;
result->size = size;
}
// rhjr: arenas should be instantiated early on in the programs lifetime, that
// is why this assertion will also be used in production.
ASSERT(result != 0);
return result;
}
internal Arena *
arena_initialize_default()
{
Arena *result = arena_initialize(ARENA_DEFAULT_RESERVE_SIZE, 1);
return result;
}
internal void *
arena_allocate(Arena *arena, u64 size)
{
void *result = 0;
Arena *current = arena->current;
u64 pos_cur = current->base_pos + current->offset;
u64 pos_mem = memory_align(pos_cur, ARENA_DEFAULT_ALIGNMENT);
u64 pos_new = pos_mem + size;
if (arena->offset + size <= arena->size)
if (current->size < pos_new && current->growable)
{
result = (void*)((u64) arena->buffer + (u64) arena->offset);
arena->offset += size;
Arena *new_memory_bock;
memset(result, 0, size);
if (size > ARENA_DEFAULT_RESERVE_SIZE)
{
// rhjr: TODO add support for allocations larger then a single page, in a
// single allocation call.
ASSERT(0);
}
else
{
new_memory_bock = arena_initialize_default();
if (new_memory_bock)
{
stack_push(arena->current, new_memory_bock, prev);
current = new_memory_bock;
pos_mem =
memory_align(current->offset, ARENA_DEFAULT_ALIGNMENT);
pos_new = current->offset + size;
}
return result;
}
}
void *memory = (void*)((u64) current->backing_buffer + pos_mem);
arena->offset = pos_new;
platform_memory_commit(memory, size);
memset(memory, 0, size);
return memory;
}
internal void
arena_release(Arena *arena)
{
arena->offset = 0;
for (Arena *node = arena->current, *prev = 0; node != 0; node = prev)
{
prev = node->prev;
platform_memory_release(node, node->size);
}
}

View File

@ -1,19 +1,30 @@
#ifndef ARENA_H
#define ARENA_H
#define ARENA_INITIAL_COMMIT_SIZE sizeof(struct Arena)
#define ARENA_DEFAULT_ALIGNMENT 0
#ifndef ARENA_DEFAULT_RESERVE_SIZE
# define ARENA_DEFAULT_RESERVE_SIZE KB(4)
#endif // ARENA_DEFAULT_RESERVE_SIZE
typedef struct Arena Arena;
struct Arena {
u64 *buffer;
struct Arena *current;
struct Arena *prev;
u64 *backing_buffer;
u64 base_pos;
u64 offset;
u64 size;
b8 growable;
};
internal Arena * arena_initialize(u64 size);
//= rhjr: arenas
internal Arena * arena_initialize(u64 size, b8 growable);
internal Arena * arena_initialize_default();
internal void * arena_allocate(Arena *arena, u64 size);
internal void arena_release(Arena *arena);
//= rhjr: arena helpers
#define arena_push_array(arena, type, count) \
(type*) arena_allocate((arena), sizeof(type) * (count))
@ -21,8 +32,12 @@ internal void arena_release(Arena *arena);
#define arena_push(arena, type) \
(type*) arena_allocate((arena), sizeof(type))
internal void arena_release(Arena *arena);
//= rhjr: memory helpers
#define memory_align(x, b) ((b != 0) ? (((x) + (b) - 1) & (~(b - 1))) : (x))
#define memory_zero(s,z) memset((s), 0, (z))
#define memory_zero_struct(s) memory_zero((s), sizeof(*(s)))

View File

@ -18,12 +18,30 @@ typedef int16_t i16;
typedef int32_t i32;
typedef int64_t i64;
typedef uint8_t b8;
typedef uint16_t b16;
typedef uint32_t b32;
typedef uint64_t b64;
#define KB(b) ((b) << 10)
#define MB(b) ((b) << 20)
#define STATEMENT(S) do{ S } while(0)
#define ASSERT(c) STATEMENT( if (!(c)){ (*(volatile int*)0 = 0); } )
#define STATIC_ASSERT(c,l) typedef u8 Glue(l,__LINE__) [(c)?1:-1]
#define MIN(A,B) (((A)<(B))?(A):(B))
//= rhjr: linked-list
#define check_null(p) ((p)==0)
#define set_null(p) ((p)=0)
#define queue_push_nz(f,l,n,next,zchk,zset) (zchk(f)?\
(((f)=(l)=(n)), zset((n)->next)):\
((l)->next=(n),(l)=(n),zset((n)->next)))
#define queue_push(f,l,n) queue_push_nz(f,l,n,next,check_null,set_null)
#define stack_push(f,n,next) ((n)->next=(f), (f)=(n))
#endif // BASE_H

View File

@ -1,58 +0,0 @@
internal Table
hash_store_initialize(void)
{
Table result = {0};
result.ptr_arena = arena_initialize(KB(1));
result.str8_arena = arena_initialize(KB(1));
result.str8_ptr = arena_push(result.ptr_arena, String8);
result.str8_count = 1;
result.str8_ptr[0] = str8_lit("");
return result;
}
internal Key
hash_store_string8_to_key(Table *table, String8 value)
{
Key result = 0;
u32 count = table->str8_count;
result = count;
String8 *str8_ptr = table->str8_ptr;
for (u32 index = 0; index < count; index += 1, str8_ptr += 1)
{
if (string8_match(*str8_ptr, value))
{
result = index;
break;
}
}
if (result == count)
{
String8 *new_str8 = arena_push(table->ptr_arena, String8);
new_str8->content =
arena_push_array(table->str8_arena, u8, value.length);
memory_copy(new_str8->content, value.content, value.length);
table->str8_count += 1;
}
return result;
}
internal String8
hash_store_string8_from_key(Table *table, Key index)
{
String8 result = {0};
if (index < table->str8_count)
{
result = table->str8_ptr[index];
}
return result;
}

View File

@ -1,21 +0,0 @@
#ifndef HASH_TABLE_H
#define HASH_TABLE_H
typedef u32 Key;
typedef struct Table Table;
struct Table
{
Arena *ptr_arena;
Arena *str8_arena;
String8 *str8_ptr;
u32 str8_count;
};
internal Table hash_store_initialize(void);
internal String8 hash_store_string8_from_key(Table *table, Key index);
internal Key hash_store_string8_to_key(Table *table, String8 value);
#endif

69
src/hash_store.c Normal file
View File

@ -0,0 +1,69 @@
internal Key
hash_store_hash(String8 data)
{
Key result = {0};
u64 hash = 5381;
for(u64 i = 0; i < data.length; i += 1)
{
hash = ((hash << 5) + hash) + data.content[i];
}
memory_copy(&result, &hash, sizeof(u64));
return result;
}
internal Table *
hash_store_initialize(void)
{
Arena *arena = arena_initialize_default();
Arena *str8_arena = arena_initialize_default();
Table *table = arena_push(arena, Table);
table->arena = arena;
table->str8_arena = str8_arena;
table->slots_count = 200;
table->slots = arena_push_array(arena, TableSlot, table->slots_count);
return table;
}
internal Key
hash_store_string8_to_key(Table *table, String8 data)
{
Key result = hash_store_hash(data);
u64 slot_idx = result.U32[0]%table->slots_count;
TableNode *node = arena_push(table->arena, TableNode);
node->data.content = arena_push_array(table->str8_arena, char, data.length);
node->data.length = data.length;
node->key = result;
memory_copy(&node->data.content, &data.content, data.length);
TableSlot *slot = &table->slots[slot_idx];
queue_push(slot->first, slot->last, node);
return result;
}
internal String8
hash_store_string8_from_key(Table *table, Key key)
{
String8 result = {0};
u64 slot_idx = key.U32[0]%table->slots_count;
TableSlot *slot = &table->slots[slot_idx];
for (TableNode *n = slot->first; n != 0; n = n->next)
{
if (key.U32[1] == n->key.U32[1])
{
result = n->data;
break;
}
}
return result;
}

39
src/hash_store.h Normal file
View File

@ -0,0 +1,39 @@
#ifndef HASH_TABLE_H
#define HASH_TABLE_H
typedef struct Key Key;
struct Key
{
u32 U32[2];
};
typedef struct TableNode TableNode;
struct TableNode
{
TableNode *next;
String8 data;
Key key;
};
typedef struct TableSlot TableSlot;
struct TableSlot
{
TableNode *first;
TableNode *last;
};
typedef struct Table Table;
struct Table
{
Arena *arena;
Arena *str8_arena;
TableSlot *slots;
u64 slots_count;
};
internal Table * hash_store_initialize(void);
internal Key hash_store_string8_to_key(Table *table, String8 data);
#endif

View File

@ -1,32 +1,28 @@
#include "base.h"
#include "win32_platform.h"
#include "arena.h"
#include "string.h"
#include "hash-store.h"
#include "hash_store.h"
#include "win32_platform.c"
#include "arena.c"
#include "string.c"
#include "hash-store.c"
#include "hash_store.c"
int
main(void)
{
Table store = hash_store_initialize();
Key a = hash_store_string8_to_key(&store, str8_lit("Hello"));
Key b = hash_store_string8_to_key(&store, str8_lit("Beautiful"));
Key c = hash_store_string8_to_key(&store, str8_lit("World"));
Table *table = hash_store_initialize();
String8 str_a = hash_store_string8_from_key(&store, a);
String8 str_b = hash_store_string8_from_key(&store, b);
String8 str_c = hash_store_string8_from_key(&store, c);
String8 str8_1 = str8_lit("Hello world");
String8 str8_2 = str8_lit("ayenooo");
ASSERT(hash_store_string8_to_key(&store, str8_lit("Hello")) == a);
ASSERT(hash_store_string8_to_key(&store, str8_lit("Beautiful")) == b);
ASSERT(hash_store_string8_to_key(&store, str8_lit("World")) == c);
Key key1 = hash_store_string8_to_key(table, str8_1);
Key key2 = hash_store_string8_to_key(table, str8_2);
Key key3 = hash_store_string8_to_key(table, str8_1);
ASSERT(string8_match(hash_store_string8_from_key(&store, a), str8_lit("Hello")));
ASSERT(string8_match(hash_store_string8_from_key(&store, b), str8_lit("Beautiful")));
ASSERT(string8_match(hash_store_string8_from_key(&store, c), str8_lit("World")));
String8 string = hash_store_string8_from_key(table, key2);
printf("%.*s\n", (i32) string.length, string.content);
return 0;
};

View File

@ -11,6 +11,7 @@ struct String8
internal String8 str8_init(u8 *cstring, u64 length);
#define str8_lit(cstring) \
str8_init((u8*)(cstring), sizeof(cstring) - 1)
#define str8_lit_comp(cstring) {(u8*)(cstring), sizeof(cstring) - 1}
internal u8 string8_match(String8 a, String8 b);

34
src/win32_platform.c Normal file
View File

@ -0,0 +1,34 @@
internal void *
platform_memory_reserve(u64 size)
{
void *result = VirtualAlloc(0, size, MEM_RESERVE, PAGE_READWRITE);
return result;
}
internal b8
platform_memory_commit(void *ptr, u64 size)
{
b32 result = (VirtualAlloc(ptr, size, MEM_COMMIT, PAGE_READWRITE) != 0);
return result;
}
internal void
platform_memory_decommit(void *ptr, u64 size)
{
VirtualFree(ptr, size, MEM_DECOMMIT);
};
internal void
platform_memory_release(void *ptr, u64 size)
{
VirtualFree(ptr, 0, MEM_RELEASE);
}
internal u64
platform_get_page_size(void)
{
SYSTEM_INFO sysinfo = {0};
GetSystemInfo(&sysinfo);
return sysinfo.dwPageSize;
}

17
src/win32_platform.h Normal file
View File

@ -0,0 +1,17 @@
#ifndef WIN32_PLATFORM_H
#define WIN32_PLATFORM_H
#undef internal
#include <Windows.h>
#define internal static
//= rhjr: platform memory management
internal void * platform_memory_reserve(u64 size);
internal b8 platform_memory_commit(void *ptr, u64 size);
internal void platform_memory_decommit(void *ptr, u64 size);
internal void platform_memory_release(void *ptr, u64 size);
internal u64 platform_get_page_size(void);
#endif // WIN32_PLATFORM_H