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#include <stdlib.h>
/// -------- Basic functions
void un_memory_set(u8 *buffer, u8 value, u64 size) {
if (size == 0) return;
assert(buffer != NULL);
while (size-- > 0) {
*buffer++ = value;
}
}
void un_memory_copy(u8 *dest, u8 *source, u64 size) {
if (size == 0) return;
assert(dest != NULL);
assert(source != NULL);
#ifdef DEBUG
if (dest < source) {
assert(((ptrdiff_t)source - (ptrdiff_t)dest) >= (ptrdiff_t)size);
} else {
assert(((ptrdiff_t)dest - (ptrdiff_t)source) >= (ptrdiff_t)size);
}
#endif // DEBUG
while (size-- > 0) {
*dest++ = *source++;
}
}
s32 un_memory_compare(u8 *left, u8 *right, u64 size) {
while (size-- > 0) {
if (*left++ == *right++)
continue;
return left[-1] > right[-1] ? 1 : -1;
}
return 0;
}
void un_memory_move(u8 *dest, u8 *src, u64 size) {
Allocator talloc = un_allocator_get_temporary();
void *temp = un_memory_alloc(size, talloc);
un_memory_copy(temp, src, size);
un_memory_copy(dest, temp, size);
}
void *un_memory_alloc(u64 size, Allocator alloc) {
assert(alloc.proc != NULL);
return alloc.proc(NULL, size, UN_ALLOC_MSG_ALLOCATE, alloc.data);
}
void *un_memory_realloc(void *ptr, u64 size, Allocator alloc) {
assert(alloc.proc != NULL);
return alloc.proc(ptr, size, UN_ALLOC_MSG_REALLOCATE, alloc.data);
}
void *un_memory_free(void *ptr, Allocator alloc) {
assert(alloc.proc != NULL);
return alloc.proc(ptr, 0, UN_ALLOC_MSG_FREE, alloc.data);
}
void un_memory_destroy(Allocator *alloc) {
assert(alloc != NULL);
assert(alloc->proc != NULL);
alloc->proc(NULL, 0, UN_ALLOC_MSG_SELF_DELETE, alloc->data);
UN_CLEAR(*alloc);
}
/// -------- Stdlib allocator
static ALLOCATOR_PROC_SIGNATURE(un_std_alloc_proc) {
UNUSED(data);
switch (message) {
case UN_ALLOC_MSG_ALLOCATE:
return calloc(1, size);
case UN_ALLOC_MSG_REALLOCATE:
return realloc(p, size);
case UN_ALLOC_MSG_FREE:
free(p);
break;
case UN_ALLOC_MSG_SELF_DELETE: break;
}
return NULL;
}
Allocator un_allocator_get_standard(void) {
return CLITERAL(Allocator) { .proc = un_std_alloc_proc };
}
/// -------- Temp allocator
static struct {
u64 index;
u8 data[UN_TEMP_SIZE];
} _temp;
static void temp_reset(void) {
_temp.index = 0;
}
static void *temp_alloc(u64 size) {
if ((_temp.index + size) > UN_TEMP_SIZE) {
// @todo: Decice what is the best behaviour for wrapping
assert(false);
temp_reset();
}
if ((_temp.index + size) > UN_TEMP_SIZE) {
return NULL;
}
void *ptr = (u8*)_temp.data + _temp.index;
_temp.index += size;
un_memory_set(ptr, 0x00, size);
return ptr;
}
static ALLOCATOR_PROC_SIGNATURE(un_temp_alloc_proc) {
UNUSED(data);
UNUSED(p);
switch (message) {
case UN_ALLOC_MSG_ALLOCATE:
return temp_alloc(size);
case UN_ALLOC_MSG_REALLOCATE:
case UN_ALLOC_MSG_FREE:
break;
case UN_ALLOC_MSG_SELF_DELETE: break;
}
return NULL;
}
Allocator un_allocator_get_temporary(void) {
return CLITERAL(Allocator) { .proc = un_temp_alloc_proc };
}
/// Arena allocator
typedef struct Arena {
u64 size;
u64 occupied;
struct Arena *next;
u8 data[1];
} Arena;
static Arena *arena_create(u64 size) {
Allocator alloc;
Arena *arena;
alloc = un_allocator_get_standard();
arena = CLITERAL(Arena*)un_memory_alloc(size, alloc);
if (!arena) {
return NULL;
}
UN_CLEAR(*arena);
arena->size = size - sizeof(Arena);
return arena;
}
static void arena_delete(Arena *arena) {
if (arena->next != NULL) {
arena_delete(arena->next);
}
Allocator alloc = un_allocator_get_standard();
un_memory_free(arena, alloc);
}
static void *arena_allocate(u64 size, Arena *arena) {
u8* pos;
if (size <= (arena->size - arena->occupied)) {
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);
}
static ALLOCATOR_PROC_SIGNATURE(un_arena_alloc_proc) {
assert(data != NULL);
UNUSED(p);
switch (message) {
case UN_ALLOC_MSG_ALLOCATE:
return arena_allocate(size, (Arena*)data);
case UN_ALLOC_MSG_REALLOCATE:
break;
case UN_ALLOC_MSG_FREE:
break;
case UN_ALLOC_MSG_SELF_DELETE:
arena_delete((Arena*)data);
break;
}
return NULL;
}
Allocator un_allocator_create_arena(u64 size) {
Allocator alloc = { 0 };
alloc.proc = un_arena_alloc_proc;
alloc.data = arena_create(size);
return alloc;
}
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