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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/test/test_discardable_memory_allocator.h"
#include <cstdint>
#include <cstring>
#include "base/check.h"
#include "base/compiler_specific.h"
#include "base/containers/heap_array.h"
#include "base/memory/discardable_memory.h"
#include "base/memory/ptr_util.h"
namespace base {
namespace {
class DiscardableMemoryImpl : public DiscardableMemory {
public:
explicit DiscardableMemoryImpl(size_t size)
: data_(base::HeapArray<uint8_t>::Uninit(size)) {}
// Overridden from DiscardableMemory:
bool Lock() override {
DCHECK(!is_locked_);
is_locked_ = true;
return false;
}
void Unlock() override {
DCHECK(is_locked_);
is_locked_ = false;
// Force eviction to catch clients not correctly checking the return value
// of Lock().
UNSAFE_TODO(memset(data_.data(), 0, data_.size()));
}
void* data() const override {
DCHECK(is_locked_);
return const_cast<uint8_t*>(data_.data());
}
void DiscardForTesting() override {}
trace_event::MemoryAllocatorDump* CreateMemoryAllocatorDump(
const char* name,
trace_event::ProcessMemoryDump* pmd) const override {
return nullptr;
}
private:
bool is_locked_ = true;
base::HeapArray<uint8_t> data_;
};
} // namespace
std::unique_ptr<DiscardableMemory>
TestDiscardableMemoryAllocator::AllocateLockedDiscardableMemory(size_t size) {
return std::make_unique<DiscardableMemoryImpl>(size);
}
size_t TestDiscardableMemoryAllocator::GetBytesAllocated() const {
return 0U;
}
} // namespace base
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