chromium/third_party/dawn/src/dawn/native/BuddyAllocator.cpp

// Copyright 2019 The Dawn & Tint Authors
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#include "dawn/native/BuddyAllocator.h"

#include "dawn/common/Assert.h"
#include "dawn/common/Math.h"

namespace dawn::native {

BuddyAllocator::BuddyAllocator(uint64_t maxSize) : … { … }

BuddyAllocator::~BuddyAllocator() { … }

uint64_t BuddyAllocator::ComputeTotalNumOfFreeBlocksForTesting() const { … }

uint64_t BuddyAllocator::ComputeNumOfFreeBlocks(BuddyBlock* block) const { … }

uint32_t BuddyAllocator::ComputeLevelFromBlockSize(uint64_t blockSize) const { … }

uint64_t BuddyAllocator::GetNextFreeAlignedBlock(size_t allocationBlockLevel,
                                                 uint64_t alignment) const { … }

// Inserts existing free block into the free-list.
// Called by allocate upon splitting to insert a child block into a free-list.
// Note: Always insert into the head of the free-list. As when a larger free block at a lower
// level was split, there were no smaller free blocks at a higher level to allocate.
void BuddyAllocator::InsertFreeBlock(BuddyBlock* block, size_t level) { … }

void BuddyAllocator::RemoveFreeBlock(BuddyBlock* block, size_t level) { … }

uint64_t BuddyAllocator::Allocate(uint64_t allocationSize, uint64_t alignment) { … }

void BuddyAllocator::Deallocate(uint64_t offset) { … }

// Helper which deletes a block in the tree recursively (post-order).
void BuddyAllocator::DeleteBlock(BuddyBlock* block) { … }

}  // namespace dawn::native