Method Allocate

Source/Engine/Core/Memory/Allocation.cpp:25–57

}

void* ArenaAllocator::Allocate(uint64 size, uint64 alignment)
{
    if (size == 0)
        return nullptr;
    if (alignment < PLATFORM_MEMORY_ALIGNMENT)
        alignment = PLATFORM_MEMORY_ALIGNMENT;

    // Find the first page that has some space left
    Page* page = _first;
    while (page && page->Offset + size + alignment > page->Size)
        page = page->Next;

    // Create a new page if need to
    if (!page)
    {
        uint64 pageSize = Math::Max<uint64>(_pageSize, size + alignment + sizeof(Page));
#if COMPILE_WITH_PROFILER
        ProfilerMemory::OnGroupUpdate(ProfilerMemory::Groups::MallocArena, (int64)pageSize, 1);
#endif
        page = (Page*)Allocator::Allocate(pageSize);
        page->Next = _first;
        page->Offset = sizeof(Page);
        page->Size = (uint32)pageSize;
        _first = page;
    }

    // Allocate within a page
    page->Offset = Math::AlignUp(page->Offset, (uint32)alignment);
    void* mem = (byte*)page + page->Offset;
    page->Offset += (uint32)size;

    return mem;
}

void ConcurrentArenaAllocator::Free()
{