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// Copyright 2023 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 <array>
#include <cstddef>
#include "pw_allocator/allocator.h"
#include "pw_allocator/block.h"
#include "pw_bytes/span.h"
namespace pw::allocator::test {
/// Fake memory allocator for testing.
///
/// This allocator can return a fixed number of allocations made using an
/// internal buffer. It records the most recent parameters passed to the
/// `Allocator` interface methods, and returns them via accessors.
class FakeAllocator : public Allocator {
public:
constexpr FakeAllocator() = default;
size_t allocate_size() const { return allocate_size_; }
void* deallocate_ptr() const { return deallocate_ptr_; }
size_t deallocate_size() const { return deallocate_size_; }
void* resize_ptr() const { return resize_ptr_; }
size_t resize_old_size() const { return resize_old_size_; }
size_t resize_new_size() const { return resize_new_size_; }
/// Provides memory for the allocator to allocate from.
Status Initialize(ByteSpan buffer);
/// Allocates all the memory from this object.
void Exhaust();
/// Resets the recorded parameters to an initial state.
void ResetParameters();
private:
/// @copydoc Allocator::Query
Status DoQuery(const void* ptr, size_t size, size_t alignment) const override;
/// @copydoc Allocator::Allocate
void* DoAllocate(size_t size, size_t alignment) override;
/// @copydoc Allocator::Deallocate
void DoDeallocate(void* ptr, size_t size, size_t alignment) override;
/// @copydoc Allocator::Resize
bool DoResize(void* ptr,
size_t old_size,
size_t old_alignment,
size_t new_size) override;
Block* head_ = nullptr;
size_t allocate_size_ = 0;
void* deallocate_ptr_ = nullptr;
size_t deallocate_size_ = 0;
void* resize_ptr_ = nullptr;
size_t resize_old_size_ = 0;
size_t resize_new_size_ = 0;
};
} // namespace pw::allocator::test
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