chunk_pool.h

// Copyright 2024 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
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// 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 <cstdint>
 
#include "pw_allocator/capability.h"
#include "pw_allocator/layout.h"
#include "pw_allocator/pool.h"
#include "pw_bytes/span.h"
#include "pw_status/status.h"
 
namespace pw::allocator {
 
class ChunkPool : public Pool {
 public:
  static constexpr Capabilities kCapabilities =
      kImplementsGetRequestedLayout | kImplementsGetUsableLayout |
      kImplementsGetAllocatedLayout | kImplementsGetCapacity |
      kImplementsRecognizes;
  static constexpr size_t kMinSize = sizeof(void*);
  static constexpr size_t kMinAlignment = alignof(void*);
 
  ChunkPool(ByteSpan region, const Layout& layout);
 
 private:
  void* DoAllocate() override;
 
  void DoDeallocate(void* ptr) override;
 
  Result<Layout> DoGetInfo(InfoType info_type, const void* ptr) const override;
 
  const Layout allocated_layout_;
  uintptr_t start_;
  uintptr_t end_;
  std::byte* next_;
};
 
}  // namespace pw::allocator