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// Copyright 2020 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include <cstddef>
#include <span>
#include "pw_allocator/block.h"
#include "pw_allocator/freelist.h"
namespace pw::allocator {
class FreeListHeap {
template <size_t kNumBuckets>
friend class FreeListHeapBuffer;
struct HeapStats {
size_t total_bytes;
size_t bytes_allocated;
size_t cumulative_allocated;
size_t cumulative_freed;
size_t total_allocate_calls;
size_t total_free_calls;
FreeListHeap(std::span<std::byte> region, FreeList& freelist);
void* Allocate(size_t size);
void Free(void* ptr);
void* Realloc(void* ptr, size_t size);
void* Calloc(size_t num, size_t size);
void LogHeapStats();
std::span<std::byte> BlockToSpan(Block* block) {
return std::span<std::byte>(block->UsableSpace(), block->InnerSize());
void InvalidFreeCrash();
std::span<std::byte> region_;
FreeList& freelist_;
HeapStats heap_stats_;
template <size_t kNumBuckets = 6>
class FreeListHeapBuffer {
static constexpr std::array<size_t, kNumBuckets> defaultBuckets{
16, 32, 64, 128, 256, 512};
FreeListHeapBuffer(std::span<std::byte> region)
: freelist_(defaultBuckets), heap_(region, freelist_) {}
void* Allocate(size_t size) { return heap_.Allocate(size); }
void Free(void* ptr) { heap_.Free(ptr); }
void* Realloc(void* ptr, size_t size) { return heap_.Realloc(ptr, size); }
void* Calloc(size_t num, size_t size) { return heap_.Calloc(num, size); }
const FreeListHeap::HeapStats& heap_stats() const {
return heap_.heap_stats_;
void LogHeapStats() { heap_.LogHeapStats(); }
FreeListBuffer<kNumBuckets> freelist_;
FreeListHeap heap_;
} // namespace pw::allocator