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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/memory/memoryarena.h>
#include <cstring>
namespace zen {
MemoryArena::~MemoryArena()
{
for (auto Chunk : m_Chunks)
delete[] Chunk;
}
void*
MemoryArena::AllocateAligned(size_t ByteCount, size_t align)
{
if (ByteCount == 0)
{
return nullptr;
}
void* Ptr = nullptr;
m_Lock.WithExclusiveLock([&] {
size_t AlignedOffset = (m_CurrentOffset + (align - 1)) & ~(align - 1);
if (m_CurrentChunk == nullptr || AlignedOffset + ByteCount > ChunkSize)
{
uint8_t* NewChunk = new uint8_t[ChunkSize];
if (!NewChunk)
{
return;
}
m_Chunks.push_back(NewChunk);
m_CurrentChunk = NewChunk;
AlignedOffset = 0;
}
Ptr = m_CurrentChunk + AlignedOffset;
m_CurrentOffset = AlignedOffset + ByteCount;
});
return Ptr;
}
void*
MemoryArena::AllocateAlignedWithOffset(size_t ByteCount, size_t align, size_t offset)
{
if (ByteCount == 0)
{
return nullptr;
}
void* Ptr = nullptr;
m_Lock.WithExclusiveLock([&] {
size_t AlignedOffset = (m_CurrentOffset + (align - 1) + offset) & ~(align - 1);
if (m_CurrentChunk == nullptr || AlignedOffset + ByteCount > ChunkSize)
{
uint8_t* NewChunk = new uint8_t[ChunkSize];
if (!NewChunk)
{
return;
}
m_Chunks.push_back(NewChunk);
m_CurrentChunk = NewChunk;
AlignedOffset = offset;
}
Ptr = m_CurrentChunk + AlignedOffset;
m_CurrentOffset = AlignedOffset + ByteCount;
});
return Ptr;
}
void*
MemoryArena::Allocate(size_t Size)
{
if (Size == 0)
{
return nullptr;
}
void* Ptr = nullptr;
constexpr size_t Alignment = alignof(std::max_align_t);
m_Lock.WithExclusiveLock([&] {
size_t AlignedOffset = (m_CurrentOffset + Alignment - 1) & ~(Alignment - 1);
if (m_CurrentChunk == nullptr || AlignedOffset + Size > ChunkSize)
{
uint8_t* NewChunk = new uint8_t[ChunkSize];
if (!NewChunk)
{
return;
}
m_Chunks.push_back(NewChunk);
m_CurrentChunk = NewChunk;
AlignedOffset = 0;
}
Ptr = m_CurrentChunk + AlignedOffset;
m_CurrentOffset = AlignedOffset + Size;
});
return Ptr;
}
const char*
MemoryArena::DuplicateString(std::string_view Str)
{
const size_t Len = Str.size();
char* NewStr = static_cast<char*>(Allocate(Len + 1));
if (NewStr)
{
memcpy(NewStr, Str.data(), Len);
NewStr[Len] = '\0';
}
return NewStr;
}
} // namespace zen
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