feat(memory): complete low-level memory management utilities

Redcraft.Utility/Source/Private/Memory/Memory.cpp

@@ -0,0 +1,85 @@
+#include "Memory/Memory.h"
+
+#include "Memory/Alignment.h"
+
+#if PLATFORM_WINDOWS
+#include <corecrt_malloc.h>
+#endif
+
+NAMESPACE_REDCRAFT_BEGIN
+NAMESPACE_MODULE_BEGIN(Redcraft)
+NAMESPACE_MODULE_BEGIN(Utility)
+
+NAMESPACE_BEGIN(Memory)
+
+void* Malloc(size_t Count, size_t Alignment)
+{
+	const size_t MinimumAlignment = Count >= 16 ? 16 : 8;
+	Alignment = MinimumAlignment > Alignment ? MinimumAlignment : Alignment;
+
+	void* Result = nullptr;
+
+#if PLATFORM_WINDOWS
+	if (Count != 0) Result = _aligned_malloc(Count, Alignment);
+#else
+	void* Ptr = SystemMalloc(Count + Alignment + sizeof(void*) + sizeof(size_t));
+	if (Ptr)
+	{
+		Result = Align(reinterpret_cast<uint8*>(Ptr) + sizeof(void*) + sizeof(size_t), Alignment);
+		*reinterpret_cast<void**>(reinterpret_cast<uint8*>(Result) - sizeof(void*)) = Ptr;
+		*reinterpret_cast<size_t*>(reinterpret_cast<uint8*>(Result) - sizeof(void*) - sizeof(size_t)) = Count;
+	}
+#endif
+
+	return Result;
+}
+
+void* Realloc(void* Ptr, size_t Count, size_t Alignment)
+{
+	const size_t MinimumAlignment = Count >= 16 ? 16 : 8;
+	Alignment = MinimumAlignment > Alignment ? MinimumAlignment : Alignment;
+
+	if (Ptr && Count)
+	{
+#if PLATFORM_WINDOWS
+		return _aligned_realloc(Ptr, Count, Alignment);
+#else
+		void* Result = Malloc(Count, Alignment);
+		size_t PtrSize = *reinterpret_cast<size_t*>(reinterpret_cast<uint8*>(Ptr) - sizeof(void*) - sizeof(size_t));
+		Memcpy(Result, Ptr, Count < PtrSize ? Count : PtrSize);
+		Free(Ptr);
+		return Result;
+#endif
+	}
+	else if (Ptr == nullptr)
+	{
+		return Malloc(Count, Alignment);
+	}
+	else
+	{
+		Free(Ptr);
+		return nullptr;
+	}
+}
+
+void Free(void* Ptr)
+{
+#if PLATFORM_WINDOWS
+	_aligned_free(Ptr);
+#else
+	SystemFree(*reinterpret_cast<void**>(reinterpret_cast<uint8*>(Ptr) - sizeof(void*)));
+#endif
+}
+
+size_t QuantizeSize(size_t Count, size_t Alignment)
+{
+	return Count;
+}
+
+NAMESPACE_END(Memory)
+
+NAMESPACE_MODULE_END(Utility)
+NAMESPACE_MODULE_END(Redcraft)
+NAMESPACE_REDCRAFT_END
+
+REPLACEMENT_OPERATOR_NEW_AND_DELETE