toybchan/minimal-heap
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toybchan
2026-06-08 04:30:08 +02:00
parent 16a390797c
commit e7d304ba35
2 changed files with 116 additions and 19 deletions
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121
minimal_heap.c
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@@ -3,26 +3,29 @@
#define MIHP_MIN(A, B) (A) < (B) ? (A) : (B)
#define MIHP_MAX(A, B) (A) > (B) ? (A) : (B)
MIHP_HeapInfo* MIHP_CreateHeap(size_t initialSize, size_t allocationAlignment)
MIHP_HeapInfo* MIHP_CreateHeap(MIHP_HeapConfig config)
{
MIHP_HeapInfo* heap = (MIHP_HeapInfo*)MIHP_PlatformRequestMemory(sizeof(MIHP_HeapInfo));
if (heap == NULL)
return NULL;
heap->FirstArea = MIHP_CreateHeapMemoryArea(heap, initialSize);
heap->Config = config;
heap->FirstArea = MIHP_CreateHeapMemoryArea(heap, config.MinimalMemoryAreaSize);
heap->FirstArea->Checksum = MIHP_GenerateHeapMemoryAreaChecksum(heap->FirstArea);
if (heap->FirstArea == NULL)
{
MIHP_PlatformFreeMemory(heap, sizeof(MIHP_HeapInfo));
return NULL;
}
heap->AllocationAlignment = allocationAlignment;
return heap;
}
bool MIHP_DestroyHeap(MIHP_HeapInfo* heap, bool force)
{
MIHP_ASSERT(heap);
if (heap == NULL)
return false;
if (!force && heap->Stats.NumTotalOccupiedSegments > 0)
return false;
@@ -31,7 +34,9 @@ bool MIHP_DestroyHeap(MIHP_HeapInfo* heap, bool force)
while (nextArea)
{
MIHP_HeapMemoryAreaHeader* currentArea = nextArea;
MIHP_ValidateHeapMemoryAreaHeader(currentArea);
nextArea = currentArea->NextArea;
MIHP_DestroyHeapMemoryArea(heap, currentArea);
}
@@ -41,7 +46,79 @@ bool MIHP_DestroyHeap(MIHP_HeapInfo* heap, bool force)
void* MIHP_Allocate(MIHP_HeapInfo* heap, size_t size)
{
return NULL;
if (heap == NULL)
return NULL;
if (size == 0)
return NULL;
if (size > heap->Config.MaximalMemoryAreaSize)
return NULL;
MIHP_LOCK_HEAP(&heap->HeapLock);
MIHP_HeapMemoryAreaHeader* nextArea = heap->FirstArea;
while (nextArea)
{
MIHP_HeapMemoryAreaHeader* currentArea = nextArea;
MIHP_ValidateHeapMemoryAreaHeader(currentArea);
nextArea = currentArea->NextArea;
if (currentArea->NumOccupiedSegments == currentArea->NumSegments)
continue;
MIHP_HeapSegmentHeader* nextSegment = currentArea->FirstSegment;
while (nextSegment)
{
MIHP_HeapSegmentHeader* currentSegment = nextSegment;
MIHP_ValidateHeapSegmentHeader(currentSegment);
nextSegment = currentSegment->NextSegment;
if (currentSegment->OccupiedSize != 0)
continue;
size_t headerSize = MIHP_GetHeapAlignedSize(heap, sizeof(MIHP_HeapSegmentHeader));
size_t minimalPayloadSize = heap->Config.AllocationAlignment;
MIHP_HeapSegmentHeader* targetSegment = NULL;
if (currentSegment->SegmentSize >= 2 * headerSize + size + minimalPayloadSize)
MIHP_SplitHeapSegment(currentSegment, headerSize + size, &targetSegment);
else if (currentSegment->SegmentSize >= headerSize + size)
targetSegment = currentSegment;
else
continue;
targetSegment->OccupiedSize = size;
targetSegment->Checksum = MIHP_GenerateHeapSegmentChecksum(targetSegment);
MIHP_UNLOCK_HEAP(&heap->HeapLock);
void* data = (char*)targetSegment + headerSize;
#if MIHP_ZERO_OUT_ALLOCATIONS
for (size_t i = 0; i < size; ++i)
*(char*)data = 0;
#endif
return data;
}
}
size_t newAreaSize = heap->Stats.TotalSize;
while (newAreaSize < size)
newAreaSize = MIHP_MIN(heap->Config.MaximalMemoryAreaSize, newAreaSize * 2);
MIHP_HeapMemoryAreaHeader* newArea = MIHP_CreateHeapMemoryArea(heap, newAreaSize);
newArea->NextArea = heap->FirstArea;
heap->FirstArea->PreviousArea = newArea;
heap->FirstArea->Checksum = MIHP_GenerateHeapMemoryAreaChecksum(heap->FirstArea);
heap->FirstArea = newArea;
newArea->Checksum = MIHP_GenerateHeapMemoryAreaChecksum(newArea);
MIHP_UNLOCK_HEAP(&heap->HeapLock);
return MIHP_Allocate(heap, size);
}
void* MIHP_Realloc(MIHP_HeapInfo* heap, void* ptr, size_t newSize)
@@ -51,10 +128,18 @@ void* MIHP_Realloc(MIHP_HeapInfo* heap, void* ptr, size_t newSize)
void MIHP_Free(MIHP_HeapInfo* heap, void* ptr)
{
if (heap == NULL)
return;
if (ptr == NULL)
return;
}
bool MIHP_IsPointerInHeap(MIHP_HeapInfo* heap, void* ptr)
{
if (heap == NULL)
return false;
MIHP_LOCK_HEAP(&heap->HeapLock);
size_t searchingPtr = (size_t)ptr;
@@ -94,6 +179,8 @@ MIHP_HeapMemoryAreaHeader* MIHP_CreateHeapMemoryArea(MIHP_HeapInfo* heap, size_t
return NULL;
heap->Stats.NumMemoryAreas++;
heap->Stats.TotalSize += effectiveSize;
area->NextArea = NULL;
area->PreviousArea = NULL;
area->AreaSize = effectiveSize;
@@ -103,8 +190,7 @@ MIHP_HeapMemoryAreaHeader* MIHP_CreateHeapMemoryArea(MIHP_HeapInfo* heap, size_t
size_t headerSize = MIHP_GetHeapAlignedSize(heap, sizeof(MIHP_HeapMemoryAreaHeader));
area->FirstSegment = MIHP_InitializeHeapSegment(area, (char*)area + headerSize, area->AreaSize - headerSize);
area->Checksum = MIHP_GenerateHeapMemoryAreaChecksum(area);
area->FirstSegment->Checksum = MIHP_GenerateHeapSegmentChecksum(area->FirstSegment);
return area;
}
@@ -116,6 +202,7 @@ bool MIHP_DestroyHeapMemoryArea(MIHP_HeapInfo* heap, MIHP_HeapMemoryAreaHeader*
size_t areaNumSegments = memoryArea->NumSegments;
size_t areaNumOccupiedSegments = memoryArea->NumOccupiedSegments;
size_t areaSize = memoryArea->AreaSize;
if (!MIHP_PlatformFreeMemory(memoryArea, memoryArea->AreaSize))
return false;
@@ -123,6 +210,8 @@ bool MIHP_DestroyHeapMemoryArea(MIHP_HeapInfo* heap, MIHP_HeapMemoryAreaHeader*
heap->Stats.NumTotalSegments -= areaNumSegments;
heap->Stats.NumTotalOccupiedSegments -= areaNumOccupiedSegments;
heap->Stats.NumMemoryAreas--;
heap->Stats.TotalSize -= areaSize;
return true;
}
@@ -138,8 +227,6 @@ MIHP_HeapSegmentHeader* MIHP_InitializeHeapSegment(MIHP_HeapMemoryAreaHeader* ar
segment->PreviousSegment = NULL;
segment->OwningMemoryArea = area;
segment->Checksum = MIHP_GenerateHeapSegmentChecksum(segment);
area->NumSegments++;
area->OwningHeap->Stats.NumTotalSegments++;
return segment;
@@ -170,8 +257,6 @@ bool MIHP_UninitializeHeapSegment(MIHP_HeapSegmentHeader* segment)
bool MIHP_SplitHeapSegment(MIHP_HeapSegmentHeader* sourceSegment, size_t newSegmentMinSize, MIHP_HeapSegmentHeader** outNewSegment)
{
MIHP_ASSERT(sourceSegment);
MIHP_ValidateHeapSegmentHeader(sourceSegment);
MIHP_ValidateHeapMemoryAreaHeader(sourceSegment->OwningMemoryArea);
size_t headerSize = MIHP_GetHeapAlignedSize(sourceSegment->OwningMemoryArea->OwningHeap, sizeof(MIHP_HeapSegmentHeader));
size_t effectiveNewSegmentSize = MIHP_GetHeapAlignedSize(sourceSegment->OwningMemoryArea->OwningHeap, newSegmentMinSize);
@@ -191,7 +276,11 @@ bool MIHP_SplitHeapSegment(MIHP_HeapSegmentHeader* sourceSegment, size_t newSegm
newSegment->PreviousSegment = sourceSegment;
if (sourceSegment->NextSegment)
{
MIHP_ValidateHeapSegmentHeader(sourceSegment->NextSegment);
sourceSegment->NextSegment->PreviousSegment = newSegment;
sourceSegment->NextSegment->Checksum = MIHP_GenerateHeapSegmentChecksum(sourceSegment->NextSegment);
}
sourceSegment->NextSegment = newSegment;
@@ -210,17 +299,17 @@ bool MIHP_MergeHeapSegments(MIHP_HeapSegmentHeader* sourceSegment, MIHP_HeapSegm
MIHP_ASSERT(segmentToAbsorb);
MIHP_ASSERT(sourceSegment->NextSegment == segmentToAbsorb);
MIHP_ValidateHeapSegmentHeader(sourceSegment);
MIHP_ValidateHeapSegmentHeader(segmentToAbsorb);
MIHP_ValidateHeapMemoryAreaHeader(segmentToAbsorb->OwningMemoryArea);
if (segmentToAbsorb->OccupiedSize > 0)
return false;
sourceSegment->NextSegment = segmentToAbsorb->NextSegment;
if (sourceSegment->NextSegment)
{
MIHP_ValidateHeapSegmentHeader(sourceSegment->NextSegment);
sourceSegment->NextSegment->PreviousSegment = sourceSegment;
sourceSegment->NextSegment->Checksum = MIHP_GenerateHeapSegmentChecksum(sourceSegment->NextSegment);
}
sourceSegment->SegmentSize += segmentToAbsorb->SegmentSize;
MIHP_UninitializeHeapSegment(segmentToAbsorb);
@@ -230,7 +319,7 @@ bool MIHP_MergeHeapSegments(MIHP_HeapSegmentHeader* sourceSegment, MIHP_HeapSegm
size_t MIHP_GetHeapAlignedSize(MIHP_HeapInfo* heap, size_t size)
{
return (size + (heap->AllocationAlignment - 1)) & ~(heap->AllocationAlignment - 1);
return (size + (heap->Config.AllocationAlignment - 1)) & ~(heap->Config.AllocationAlignment - 1);
}
uint32_t MIHP_HashMemoryRegion(const void* data, size_t size)