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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_MemoryInfo_h
#define mozilla_MemoryInfo_h
#include <cstddef>
#include <cstdint>
#include "mozilla/Attributes.h"
#include "mozilla/EnumSet.h"
/**
* MemoryInfo is a helper class which describes the attributes and sizes of a
* particular region of VM memory on Windows. It roughtly corresponds to the
* values in a MEMORY_BASIC_INFORMATION struct, summed over an entire region or
* memory.
*/
namespace mozilla {
class MemoryInfo final {
public:
enum class Perm : uint8_t {
Read,
Write,
Execute,
CopyOnWrite,
Guard,
NoCache,
WriteCombine,
};
enum class PageType : uint8_t {
Image,
Mapped,
Private,
};
using PermSet = EnumSet<Perm>;
using PageTypeSet = EnumSet<PageType>;
MemoryInfo() = default;
MOZ_IMPLICIT MemoryInfo(const MemoryInfo&) = default;
uintptr_t Start() const { return mStart; }
uintptr_t End() const { return mEnd; }
PageTypeSet Type() const { return mType; }
PermSet Perms() const { return mPerms; }
size_t Reserved() const { return mReserved; }
size_t Committed() const { return mCommitted; }
size_t Free() const { return mFree; }
size_t Size() const { return mSize; }
// Returns a MemoryInfo object containing the sums of all region sizes,
// divided into Reserved, Committed, and Free, depending on their State
// properties.
//
// The entire range of aSize bytes starting at aPtr must correspond to a
// single allocation. This restriction is enforced in debug builds.
static MemoryInfo Get(const void* aPtr, size_t aSize);
private:
uintptr_t mStart = 0;
uintptr_t mEnd = 0;
size_t mReserved = 0;
size_t mCommitted = 0;
size_t mFree = 0;
size_t mSize = 0;
PageTypeSet mType{};
PermSet mPerms{};
};
} // namespace mozilla
#endif // mozilla_MemoryInfo_h
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