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