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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_BASE_PAGE_ALLOCATOR_H_
#define V8_BASE_PAGE_ALLOCATOR_H_
#include <memory>
#include "include/v8-platform.h"
#include "src/base/base-export.h"
#include "src/base/compiler-specific.h"
namespace v8 {
namespace base {
class SharedMemory;
class V8_BASE_EXPORT PageAllocator
: public NON_EXPORTED_BASE(::v8::PageAllocator) {
public:
PageAllocator();
~PageAllocator() override = default;
size_t AllocatePageSize() override { return allocate_page_size_; }
size_t CommitPageSize() override { return commit_page_size_; }
void SetRandomMmapSeed(int64_t seed) override;
void* GetRandomMmapAddr() override;
void* AllocatePages(void* hint, size_t size, size_t alignment,
PageAllocator::Permission access) override;
bool CanAllocateSharedPages() override;
std::unique_ptr<v8::PageAllocator::SharedMemory> AllocateSharedPages(
size_t size, const void* original_address) override;
bool FreePages(void* address, size_t size) override;
bool ReleasePages(void* address, size_t size, size_t new_size) override;
bool SetPermissions(void* address, size_t size,
PageAllocator::Permission access) override;
bool DiscardSystemPages(void* address, size_t size) override;
private:
friend class v8::base::SharedMemory;
void* RemapShared(void* old_address, void* new_address, size_t size);
const size_t allocate_page_size_;
const size_t commit_page_size_;
};
} // namespace base
} // namespace v8
#endif // V8_BASE_PAGE_ALLOCATOR_H_
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