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Remove realloc, rename AllocateMetadata

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This commit is contained in:
doyle 2020-07-15 19:18:14 +10:00
parent 4bc0aec917
commit 6cf6751013
1 changed files with 53 additions and 117 deletions
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160
Code/Dqn.h
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@ -241,11 +241,6 @@ STBSP__PUBLICDEF void STB_SPRINTF_DECORATE(set_separators)(char comma, char peri
#define DQN_MALLOC(size) malloc(size)
#endif
#ifndef DQN_REALLOC
#include <stdlib.h>
#define DQN_REALLOC(ptr, new_size) realloc(ptr, new_size)
#endif
#ifndef DQN_FREE
#include <stdlib.h>
#define DQN_FREE(ptr) free(ptr)
@ -292,8 +287,8 @@ STBSP__PUBLICDEF void STB_SPRINTF_DECORATE(set_separators)(char comma, char peri
#define DQN_LEN_AND_STR(string) Dqn_CharCount(str), string
#define DQN_STR_AND_LEN(string) string, Dqn_CharCount(string)
#define DQN_STR_AND_LEN_I(string) string, (int)Dqn_CharCount(string)
#define DQN_FOR_EACH(i, limit) for (Dqn_isize (i) = 0; (i) < (Dqn_isize)(limit); ++(i))
#define DQN_FOR_EACH_REVERSE(i, limit) for (Dqn_isize (i) = (Dqn_isize)(limit-1); (i) >= 0; --(i))
#define DQN_FOR_EACH(i, limit) for (Dqn_isize i = 0; i < (Dqn_isize)(limit); ++i)
#define DQN_FOR_EACH_REVERSE(i, limit) for (Dqn_isize i = (Dqn_isize)(limit-1); i >= 0; --i)
#define DQN_FOR_EACH_ITERATOR(it_name, array, num) for (auto it_name = array; it_name != (array + num); it_name++)
#define DQN_BYTES(val) (val)
@ -622,33 +617,42 @@ DQN_HEADER_COPY_PROTOTYPE(template <typename T> T *, Dqn_MemZero(T *src))
return result;
}
// @ -------------------------------------------------------------------------------------------------
// @
// @ NOTE: Dqn_AllocatorAlignMetadata
// @
// @ -------------------------------------------------------------------------------------------------
// @ For embedding alignment metadata into pointers, useful for custom allocators
struct Dqn_AllocatorAlignMetadata
{
Dqn_u8 alignment;
Dqn_u8 offset; // Subtract offset from aligned ptr to return to the allocation ptr
};
// @ -------------------------------------------------------------------------------------------------
// @
// @ NOTE: Dqn_Allocator
// @
// @ -------------------------------------------------------------------------------------------------
// @ Custom allocations must include Dqn_AllocateMetadata before the aligned_ptr, see Dqn_AllocateMetadata for more information
DQN_HEADER_COPY_BEGIN
enum struct Dqn_Allocator_Type
{
#if defined(DQN_ALLOCATOR_DEFAULT_TO_NULL)
Null,
Heap, // Malloc, realloc, free
Heap, // Malloc, free
#else
Heap, // Malloc, realloc, free
Heap, // Malloc, free
Null,
#endif
XHeap, // Malloc realloc, free, crash on failure
XHeap, // Malloc free, crash on failure
Arena,
Custom,
};
#define DQN_ALLOCATOR_ALLOCATE_PROC(name) void *name(Dqn_isize size, Dqn_u8 alignment, void *user_context)
#define DQN_ALLOCATOR_REALLOC_PROC(name) void *name(void *old_ptr, Dqn_isize old_size, Dqn_isize new_size, void *user_context)
#define DQN_ALLOCATOR_FREE_PROC(name) void name(void *ptr, void *user_context)
typedef DQN_ALLOCATOR_ALLOCATE_PROC(Dqn_Allocator_AllocateProc);
typedef DQN_ALLOCATOR_REALLOC_PROC(Dqn_Allocator_ReallocProc);
typedef DQN_ALLOCATOR_FREE_PROC(Dqn_Allocator_FreeProc);
struct Dqn_Allocator
{
@ -667,7 +671,6 @@ struct Dqn_Allocator
// NOTE: Only required if type == Dqn_Allocator_Type::Custom
Dqn_Allocator_AllocateProc *allocate;
Dqn_Allocator_ReallocProc *realloc;
Dqn_Allocator_FreeProc *free;
};
DQN_HEADER_COPY_END
@ -708,21 +711,6 @@ DQN_HEADER_COPY_PROTOTYPE(template <typename T> T *, Dqn_Allocator_AllocateType(
return result;
}
// @ -------------------------------------------------------------------------------------------------
// @
// @ NOTE: Dqn_AllocatorMetadata
// @
// @ -------------------------------------------------------------------------------------------------
// @ Custom Dqn_Allocator implementations must include allocation metadata exactly (aligned_ptr - sizeof(Dqn_AllocatorMetadata)) bytes from the aligned ptr.
DQN_HEADER_COPY_BEGIN
struct Dqn_AllocateMetadata
{
Dqn_u8 alignment;
Dqn_u8 offset; // Subtract offset from aligned ptr to return to the allocation ptr
};
DQN_HEADER_COPY_END
// @ -------------------------------------------------------------------------------------------------
// @
// @ NOTE: Dqn_ArenaAllocator
@ -1284,10 +1272,16 @@ DQN_HEADER_COPY_PROTOTYPE(template <typename T> Dqn_Array<T>, Dqn_Array_InitWith
DQN_HEADER_COPY_PROTOTYPE(template <typename T> bool, Dqn_Array_Reserve(Dqn_Array<T> *a, Dqn_isize size))
{
if (size <= a->len) return true;
T *new_ptr = nullptr;
if (a->data) new_ptr = DQN_CAST(T *)Dqn_Allocator_Realloc (&a->allocator, a->data, sizeof(T) * a->max, sizeof(T) * size);
else new_ptr = DQN_CAST(T *)Dqn_Allocator_Allocate(&a->allocator, sizeof(T) * size, alignof(T));
T *new_ptr = DQN_CAST(T *)Dqn_Allocator_Allocate(&a->allocator, sizeof(T) * size, alignof(T));
if (!new_ptr) return false;
if (a->data)
{
// NOTE(doyle): Realloc, I don't like and don't support. Use virtual arrays
DQN_MEMCOPY(new_ptr, a->data, a->len * sizeof(T));
Dqn_Allocator_Free(&a->allocator, a->data);
}
a->data = new_ptr;
a->max = size;
return true;
@ -1591,14 +1585,10 @@ DQN_HEADER_COPY_PROTOTYPE(Dqn_uintptr, Dqn_AlignAddressEnsuringSpace(Dqn_uintptr
return result;
}
// @ -------------------------------------------------------------------------------------------------
// @
// @ NOTE: Dqn_AllocateMetadata
// @
// @ -------------------------------------------------------------------------------------------------
DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocateMetadata_Init(void *ptr, Dqn_u8 alignment))
DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocatorAlignMetadata_Init(void *ptr, Dqn_u8 alignment))
{
DQN_ASSERT_MSG((alignment & 1) == 0, "Alignment must be a power of 2, %u", alignment);
// NOTE: Given a pointer, it can misaligned by up to (Alignment - 1) bytes.
// After calculating the offset to apply on the aligned ptr, we store the
// allocation metadata right before the ptr for convenience, so that we just
@ -1617,10 +1607,9 @@ DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocateMetadata_Init(void *ptr, Dqn_u8 al
// Offset is [0->Alignment-1] bytes from the Unaligned ptr.
auto raw_ptr = DQN_CAST(uintptr_t) ptr;
auto unaligned_ptr = raw_ptr + sizeof(Dqn_AllocateMetadata);
auto unaligned_ptr = raw_ptr + sizeof(Dqn_AllocatorAlignMetadata);
auto result = DQN_CAST(uintptr_t) unaligned_ptr;
// @TODO(doyle): Use bit masks and only support POT. That approach reflects how computers work better.
if ((unaligned_ptr % alignment) > 0)
{
uintptr_t unaligned_to_aligned_offset = alignment - (unaligned_ptr % alignment);
@ -1631,31 +1620,31 @@ DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocateMetadata_Init(void *ptr, Dqn_u8 al
ptrdiff_t difference = DQN_CAST(ptrdiff_t)result - DQN_CAST(ptrdiff_t)raw_ptr;
DQN_ASSERT(difference <= DQN_CAST(Dqn_u8)-1);
auto *metadata_ptr = DQN_CAST(Dqn_AllocateMetadata *)(result - sizeof(Dqn_AllocateMetadata));
auto *metadata_ptr = DQN_CAST(Dqn_AllocatorAlignMetadata *)(result - sizeof(Dqn_AllocatorAlignMetadata));
metadata_ptr->alignment = alignment;
metadata_ptr->offset = DQN_CAST(Dqn_u8)difference;
return DQN_CAST(char *)result;
}
DQN_HEADER_COPY_PROTOTYPE(Dqn_AllocateMetadata, Dqn_AllocateMetadata_Get(void *ptr))
DQN_HEADER_COPY_PROTOTYPE(Dqn_AllocatorAlignMetadata, Dqn_AllocatorAlignMetadata_Get(void *ptr))
{
auto *aligned_ptr = DQN_CAST(char *) ptr;
auto result = *DQN_CAST(Dqn_AllocateMetadata *)(aligned_ptr - sizeof(Dqn_AllocateMetadata));
auto result = *DQN_CAST(Dqn_AllocatorAlignMetadata *)(aligned_ptr - sizeof(Dqn_AllocatorAlignMetadata));
return result;
}
DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocateMetadata_GetRawPointer(void *ptr))
DQN_HEADER_COPY_PROTOTYPE(char *, Dqn_AllocatorAlignMetadata_GetRawPointer(void *ptr))
{
Dqn_AllocateMetadata metadata = Dqn_AllocateMetadata_Get(ptr);
char *result = DQN_CAST(char *)ptr - metadata.offset;
Dqn_AllocatorAlignMetadata metadata = Dqn_AllocatorAlignMetadata_Get(ptr);
char *result = DQN_CAST(char *) ptr - metadata.offset;
return result;
}
DQN_HEADER_COPY_PROTOTYPE(Dqn_isize, Dqn_AllocateMetadata_SizeRequired(Dqn_isize size, Dqn_u8 alignment))
DQN_HEADER_COPY_PROTOTYPE(Dqn_isize, Dqn_AllocatorAlignMetadata_SizeRequired(Dqn_isize size, Dqn_u8 alignment))
{
DQN_ASSERT(alignment > 0);
if (alignment <= 0) alignment = 1;
Dqn_isize result = size + DQN_CAST(Dqn_i8)(alignment - 1) + DQN_CAST(Dqn_isize)sizeof(Dqn_AllocateMetadata);
Dqn_isize result = size + DQN_CAST(Dqn_i8)(alignment - 1) + DQN_CAST(Dqn_isize)sizeof(Dqn_AllocatorAlignMetadata);
return result;
}
@ -1666,7 +1655,6 @@ DQN_HEADER_COPY_PROTOTYPE(Dqn_isize, Dqn_AllocateMetadata_SizeRequired(Dqn_isize
// @ -------------------------------------------------------------------------------------------------
DQN_HEADER_COPY_PROTOTYPE(void *, Dqn_Allocator_Allocate(Dqn_Allocator *allocator, Dqn_isize size, Dqn_u8 alignment, Dqn_ZeroMem zero_mem = Dqn_ZeroMem::Yes))
{
Dqn_isize allocation_size = Dqn_AllocateMetadata_SizeRequired(size, alignment);
char *result = nullptr;
switch (allocator->type)
{
@ -1676,13 +1664,12 @@ DQN_HEADER_COPY_PROTOTYPE(void *, Dqn_Allocator_Allocate(Dqn_Allocator *allocato
case Dqn_Allocator_Type::Heap:
case Dqn_Allocator_Type::XHeap:
{
void *ptr = zero_mem == Dqn_ZeroMem::Yes ? DQN_CALLOC(1, DQN_CAST(size_t)allocation_size) : DQN_MALLOC(allocation_size);
result = Dqn_AllocateMetadata_Init(ptr, alignment);
size = Dqn_AllocatorAlignMetadata_SizeRequired(size, alignment);
void *ptr = zero_mem == Dqn_ZeroMem::Yes ? DQN_CALLOC(1, DQN_CAST(size_t)size) : DQN_MALLOC(size);
result = Dqn_AllocatorAlignMetadata_Init(ptr, alignment);
if (!result && allocator->type == Dqn_Allocator_Type::XHeap)
{
DQN_ASSERT(result);
}
}
break;
case Dqn_Allocator_Type::Arena:
@ -1702,61 +1689,7 @@ DQN_HEADER_COPY_PROTOTYPE(void *, Dqn_Allocator_Allocate(Dqn_Allocator *allocato
if (result)
{
allocator->allocations++;
allocator->total_bytes_allocated += allocation_size;
}
return result;
}
DQN_HEADER_COPY_PROTOTYPE(void *, Dqn_Allocator_Realloc(Dqn_Allocator *allocator, void *old_ptr, Dqn_isize old_size, Dqn_isize new_size))
{
DQN_ASSERT_IF(old_size < 0) old_size = 0;
DQN_ASSERT_IF(new_size < 0) new_size = 0;
DQN_ASSERT(new_size > old_size);
auto metadata = Dqn_AllocateMetadata_Get(old_ptr);
Dqn_isize allocation_size = Dqn_AllocateMetadata_SizeRequired(new_size, metadata.alignment);
void *result = nullptr;
switch (allocator->type)
{
case Dqn_Allocator_Type::Null:
default: break;
case Dqn_Allocator_Type::Heap:
case Dqn_Allocator_Type::XHeap:
{
char *original_ptr = Dqn_AllocateMetadata_GetRawPointer(old_ptr);
void *new_ptr = DQN_REALLOC(original_ptr, DQN_CAST(size_t) allocation_size);
if (new_ptr)
{
result = Dqn_AllocateMetadata_Init(new_ptr, metadata.alignment);
}
else if (allocator->type == Dqn_Allocator_Type::XHeap)
{
DQN_ASSERT(DQN_INVALID_CODE_PATH);
}
}
break;
case Dqn_Allocator_Type::Arena:
{
Dqn_ArenaAllocator *arena = allocator->context.arena;
result = Dqn_ArenaAllocator_Allocate(arena, new_size, metadata.alignment, Dqn_ZeroMem::No);
if (result) DQN_MEMCOPY(result, old_ptr, DQN_CAST(size_t) old_size);
}
break;
case Dqn_Allocator_Type::Custom:
{
if (allocator->realloc)
result = allocator->realloc(old_ptr, old_size, new_size, allocator->context.user);
}
break;
}
if (result)
{
allocator->total_bytes_allocated += allocation_size;
allocator->total_allocations++;
allocator->total_bytes_allocated += size;
}
return result;
}
@ -1771,7 +1704,7 @@ DQN_HEADER_COPY_PROTOTYPE(void, Dqn_Allocator_Free(Dqn_Allocator *allocator, voi
case Dqn_Allocator_Type::Heap:
case Dqn_Allocator_Type::XHeap:
{
char *raw_ptr = Dqn_AllocateMetadata_GetRawPointer(ptr);
char *raw_ptr = Dqn_AllocatorAlignMetadata_GetRawPointer(ptr);
DQN_FREE(raw_ptr);
}
break;
@ -1908,13 +1841,16 @@ DQN_HEADER_COPY_PROTOTYPE(Dqn_b32, Dqn_ArenaAllocator_Reserve(Dqn_ArenaAllocator
return true;
}
DQN_HEADER_COPY_PROTOTYPE(Dqn_ArenaAllocator, Dqn_ArenaAllocator_InitWithAllocator(Dqn_Allocator allocator, Dqn_isize size))
DQN_HEADER_COPY_PROTOTYPE(Dqn_ArenaAllocator, Dqn_ArenaAllocator_InitWithAllocator(Dqn_Allocator allocator, Dqn_isize size = 0))
{
Dqn_ArenaAllocator result = {};
DQN_ASSERT_MSG(size >= DQN_ISIZEOF(*result.curr_mem_block), "(%zu >= %zu) There needs to be enough space to encode the Dqn_ArenaAllocatorBlock struct into the memory buffer", size, sizeof(*result.curr_mem_block));
result.allocator = allocator;
if (size > 0)
{
DQN_ASSERT_MSG(size >= DQN_ISIZEOF(*result.curr_mem_block), "(%zu >= %zu) There needs to be enough space to encode the Dqn_ArenaAllocatorBlock struct into the memory buffer", size, sizeof(*result.curr_mem_block));
Dqn_ArenaAllocatorBlock *mem_block = Dqn_ArenaAllocator__AllocateBlock(&result, size);
Dqn_ArenaAllocator__AttachBlock(&result, mem_block);
}
return result;
}