forked from mirrors/gecko-dev
44c4164368
This patch splits `nsAvailableMemoryWatcher` into 1) an nsISupports-derived class `nsAvailableMemoryWatcherBase` and 2) a platform-specific class `nsAvailableMemoryWatcher`, taking out the 2) part as a new file AvailableMemoryWatcherWin.cpp without any change. Test cases for `nsAvailableMemoryWatcher` will be added by a subsequent patch. Differential Revision: https://phabricator.services.mozilla.com/D117669
105 lines
2.9 KiB
C++
105 lines
2.9 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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#include "mozilla/MemoryInfo.h"
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#include "mozilla/DebugOnly.h"
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#include <algorithm>
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#include <windows.h>
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namespace mozilla {
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/* static */
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MemoryInfo MemoryInfo::Get(const void* aPtr, size_t aSize) {
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MemoryInfo result;
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result.mStart = uintptr_t(aPtr);
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const char* ptr = reinterpret_cast<const char*>(aPtr);
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const char* end = ptr + aSize;
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DebugOnly<void*> base = nullptr;
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while (ptr < end) {
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MEMORY_BASIC_INFORMATION basicInfo;
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if (!VirtualQuery(ptr, &basicInfo, sizeof(basicInfo))) {
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break;
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}
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MOZ_ASSERT_IF(base, base == basicInfo.AllocationBase);
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base = basicInfo.AllocationBase;
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size_t regionSize =
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std::min(size_t(basicInfo.RegionSize), size_t(end - ptr));
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if (basicInfo.State == MEM_COMMIT) {
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result.mCommitted += regionSize;
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} else if (basicInfo.State == MEM_RESERVE) {
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result.mReserved += regionSize;
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} else if (basicInfo.State == MEM_FREE) {
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result.mFree += regionSize;
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} else {
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MOZ_ASSERT_UNREACHABLE("Unexpected region state");
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}
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result.mSize += regionSize;
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ptr += regionSize;
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if (result.mType.isEmpty()) {
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if (basicInfo.Type & MEM_IMAGE) {
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result.mType += PageType::Image;
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}
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if (basicInfo.Type & MEM_MAPPED) {
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result.mType += PageType::Mapped;
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}
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if (basicInfo.Type & MEM_PRIVATE) {
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result.mType += PageType::Private;
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}
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// The first 8 bits of AllocationProtect are an enum. The remaining bits
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// are flags.
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switch (basicInfo.AllocationProtect & 0xff) {
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case PAGE_EXECUTE_WRITECOPY:
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result.mPerms += Perm::CopyOnWrite;
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[[fallthrough]];
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case PAGE_EXECUTE_READWRITE:
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result.mPerms += Perm::Write;
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[[fallthrough]];
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case PAGE_EXECUTE_READ:
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result.mPerms += Perm::Read;
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[[fallthrough]];
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case PAGE_EXECUTE:
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result.mPerms += Perm::Execute;
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break;
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case PAGE_WRITECOPY:
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result.mPerms += Perm::CopyOnWrite;
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[[fallthrough]];
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case PAGE_READWRITE:
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result.mPerms += Perm::Write;
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[[fallthrough]];
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case PAGE_READONLY:
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result.mPerms += Perm::Read;
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break;
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default:
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break;
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}
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if (basicInfo.AllocationProtect & PAGE_GUARD) {
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result.mPerms += Perm::Guard;
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}
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if (basicInfo.AllocationProtect & PAGE_NOCACHE) {
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result.mPerms += Perm::NoCache;
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}
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if (basicInfo.AllocationProtect & PAGE_WRITECOMBINE) {
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result.mPerms += Perm::WriteCombine;
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}
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}
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}
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result.mEnd = uintptr_t(ptr);
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return result;
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}
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} // namespace mozilla
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