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#include "allocator.h"
#include <assert.h>
#include <string.h>
#ifndef KIT_DISABLE_SYSTEM_MALLOC
# include <stdlib.h>
#endif
static void *kit_allocate_default_(i32 request, i64 size,
i64 previous_size, void *pointer) {
#ifndef KIT_DISABLE_SYSTEM_MALLOC
switch (request) {
case KIT_ALLOCATE:
case KIT_ALLOCATE_ZERO: {
assert(size >= 0);
assert(previous_size == 0);
assert(pointer == NULL);
if (size <= 0)
return NULL;
void *p = malloc(size);
if (p != NULL && request == KIT_ALLOCATE_ZERO)
memset(p, 0, size);
return p;
}
case KIT_REALLOCATE:
case KIT_REALLOCATE_ZERO: {
assert(size >= 0);
assert(previous_size != 0 || pointer == NULL);
assert(previous_size == 0 || pointer != NULL);
if (previous_size == 0 && pointer != NULL)
return NULL;
if (previous_size != 0 && pointer == NULL)
return NULL;
if (size == previous_size)
return pointer;
u8 *p = NULL;
if (size > 0) {
p = (u8 *) malloc(size);
if (p != NULL) {
if (size > 0 && previous_size > 0)
memcpy(p, pointer,
size < previous_size ? size : previous_size);
if (request == KIT_REALLOCATE_ZERO && size > previous_size)
memset(p + previous_size, 0, size - previous_size);
}
}
free(pointer);
return p;
}
case KIT_DEALLOCATE:
assert(size == 0);
assert(pointer != NULL);
if (pointer != NULL)
free(pointer);
return NULL;
case KIT_DEALLOCATE_ALL:
// Do nothing.
//
return NULL;
default:;
}
#endif
assert(0);
return NULL;
}
static void *kit_allocate_from_buffer_(kit_allocator_t *alloc,
i32 request, i64 size,
i64 previous_size,
void *pointer) {
assert(alloc != NULL);
assert(pointer == NULL || pointer < alloc->data);
if (alloc == NULL)
return NULL;
switch (request) {
case KIT_ALLOCATE:
case KIT_ALLOCATE_ZERO: {
assert(size >= 0);
assert(previous_size == 0);
assert(pointer == NULL);
if (size <= 0)
return NULL;
if (alloc->size < size)
return NULL;
void *p = alloc->data;
alloc->bytes += size;
alloc->size -= size;
if (request == KIT_ALLOCATE_ZERO)
memset(p, 0, size);
return p;
}
case KIT_REALLOCATE:
case KIT_REALLOCATE_ZERO: {
assert(size >= 0);
assert(previous_size != 0 || pointer == NULL);
assert(previous_size == 0 || pointer != NULL);
if (size <= 0)
return NULL;
if (size <= previous_size)
return pointer;
if (previous_size == 0 && pointer != NULL)
return NULL;
if (previous_size != 0 && pointer == NULL)
return NULL;
if ((u8 *) pointer + previous_size == alloc->data) {
if (alloc->size < size - previous_size)
return NULL;
alloc->bytes += size - previous_size;
alloc->size -= size - previous_size;
return pointer;
}
if (alloc->size < size)
return NULL;
u8 *p = alloc->bytes;
alloc->bytes += size;
alloc->size -= size;
if (previous_size > 0)
memcpy(p, pointer, previous_size);
if (request == KIT_REALLOCATE_ZERO)
memset(p + previous_size, 0, size - previous_size);
return p;
}
case KIT_DEALLOCATE:
case KIT_DEALLOCATE_ALL: return NULL;
default:;
}
assert(0);
return NULL;
}
#ifndef KIT_ENABLE_CUSTOM_ALLOC_DISPATCH
void *kit_alloc_dispatch(kit_allocator_t *alloc, i32 request,
i64 size, i64 previous_size, void *pointer) {
if (alloc == NULL)
return kit_allocate_default_(request, size, previous_size,
pointer);
switch (alloc->type) {
case KIT_ALLOC_TYPE_DEFAULT:
return kit_allocate_default_(request, size, previous_size,
pointer);
case KIT_ALLOC_TYPE_BUFFER:
return kit_allocate_from_buffer_(alloc, request,
// alignment
((size + 7) / 8) * 8,
previous_size, pointer);
default:;
}
return NULL;
}
#endif
kit_allocator_t kit_alloc_default(void) {
kit_allocator_t alloc = { .type = KIT_ALLOC_TYPE_DEFAULT,
.size = 0,
.data = NULL };
return alloc;
}
kit_allocator_t kit_alloc_buffer(i64 size, void *buffer) {
kit_allocator_t alloc = { .type = KIT_ALLOC_TYPE_BUFFER,
.size = size,
.data = buffer };
return alloc;
}
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