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#include <stdlib.h>
typedef enum {
ALLOCATOR_ALLOCATE,
ALLOCATOR_REALLOCATE,
ALLOCATOR_DEALLOCATE,
ALLOCATOR_DELETE
} Allocator_Message;
#define ALLOCATOR_PROC(name)\
void *name(void *p, u64 size, Allocator_Message message, void *data)
typedef ALLOCATOR_PROC(Allocator_Proc);
typedef struct {
Allocator_Proc *proc;
void *data;
} Allocator;
#define mem_alloc(alloc, size) (alloc).proc(NULL, size, ALLOCATOR_ALLOCATE, (alloc).data)
#define mem_realloc(alloc, ptr, size) (alloc).proc(ptr, size, ALLOCATOR_REALLOCATE, (alloc).data)
#define mem_free(alloc, ptr) (alloc).proc(ptr, 0, ALLOCATOR_DEALLOCATE, (alloc).data)
#define mem_delete(alloc) (alloc).proc(NULL, 0, ALLOCATOR_DELETE, (alloc).data)
Allocator get_stdlib_allocator(void);
Allocator get_temporary_allocator(void);
Allocator create_arena_allocator(u64 size);
/// Stdlib Allocator
ALLOCATOR_PROC(stdlib_allocator_proc) {
UNUSED(data);
switch (message) {
case ALLOCATOR_ALLOCATE:
return calloc(1, size);
case ALLOCATOR_REALLOCATE:
return realloc((u8*)p, size);
case ALLOCATOR_DEALLOCATE:
free((u8*)p);
break;
case ALLOCATOR_DELETE:
break;
}
return NULL;
}
Allocator get_stdlib_allocator(void) {
return CLITERAL(Allocator) { stdlib_allocator_proc, NULL };
}
/// Temp Allocator
#define TEMP_SIZE MB(50)
struct {
b32 initialized;
u64 index;
u8 data[TEMP_SIZE];
} __temp_alloc;
void temp_reset(void) {
__temp_alloc.index = 0;
}
void *temp_allocate(u64 size) {
if ((__temp_alloc.index + size) > TEMP_SIZE) {
TraceLog(LOG_ERROR, "Temp allocator wrapped!");
temp_reset();
}
if ((__temp_alloc.index + size) > TEMP_SIZE) {
TraceLog(LOG_ERROR, "Too much space requested!");
return NULL;
}
void *pos = (u8*)__temp_alloc.data + __temp_alloc.index;
__temp_alloc.index += size;
memset(pos, 0x00, size);
return pos;
}
ALLOCATOR_PROC(temp_allocator_proc) {
UNUSED(data);
UNUSED(p);
if (!__temp_alloc.initialized) {
__temp_alloc.initialized = true;
temp_reset();
}
switch (message) {
case ALLOCATOR_ALLOCATE:
return temp_allocate(size);
case ALLOCATOR_REALLOCATE:
case ALLOCATOR_DEALLOCATE:
break;
case ALLOCATOR_DELETE:
temp_reset();
break;
}
return NULL;
}
Allocator get_temporary_allocator(void) {
return CLITERAL(Allocator) { temp_allocator_proc, NULL };
}
/// Arena allocator
typedef struct Arena {
u64 size;
u64 occupied;
struct Arena *next;
u8 data[1]; // you dont have zero size arrays in MSVC...
} Arena;
Arena *arena_create(u64 size) {
Allocator alloc = get_stdlib_allocator();
Arena *arena = (Arena *)mem_alloc(alloc, size);
if (!arena) {
TraceLog(LOG_FATAL, "Buy mem, failed to create arena!");
return NULL;
}
memset(arena, 0, sizeof(Arena));
arena->size = size - sizeof(Arena);
return arena;
}
void arena_delete(Arena *arena) {
if (arena->next != NULL) {
arena_delete(arena->next);
}
Allocator alloc = get_stdlib_allocator();
mem_free(alloc, arena);
}
void *arena_allocate(u64 size, Arena *arena) {
if (size <= (arena->size - arena->occupied)) {
u8* pos = arena->data + arena->occupied;
arena->occupied += size;
return (void*)pos;
}
if (!arena->next) {
arena->next = arena_create((arena->size + sizeof(Arena)) * 2LL);
}
return arena_allocate(size, arena->next);
}
ALLOCATOR_PROC(arena_allocator_proc) {
UNUSED(p);
assert(data != NULL);
Arena *arena = (Arena*)data;
switch (message) {
case ALLOCATOR_ALLOCATE:
return arena_allocate(size, arena);
case ALLOCATOR_REALLOCATE:
TraceLog(LOG_ERROR, "Arena doesn't reallocate.");
break;
case ALLOCATOR_DEALLOCATE:
TraceLog(LOG_ERROR, "Arena doesn't free it's memory, please destroy arena itself.");
break;
case ALLOCATOR_DELETE:
arena_delete(arena);
break;
}
return NULL;
}
Allocator create_arena_allocator(u64 size) {
return CLITERAL(Allocator) { arena_allocator_proc, arena_create(size) };
}
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