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-rw-r--r--xpcom/base/MemoryInfo.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/xpcom/base/MemoryInfo.h b/xpcom/base/MemoryInfo.h
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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