summaryrefslogtreecommitdiffstats
path: root/xpcom/base/MemoryInfo.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--xpcom/base/MemoryInfo.cpp105
1 files changed, 105 insertions, 0 deletions
diff --git a/xpcom/base/MemoryInfo.cpp b/xpcom/base/MemoryInfo.cpp
new file mode 100644
index 0000000000..6ce7f2b768
--- /dev/null
+++ b/xpcom/base/MemoryInfo.cpp
@@ -0,0 +1,105 @@
+/* -*- 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/. */
+
+#include "mozilla/MemoryInfo.h"
+
+#include "mozilla/DebugOnly.h"
+
+#include <algorithm>
+#include <windows.h>
+
+namespace mozilla {
+
+/* static */
+MemoryInfo MemoryInfo::Get(const void* aPtr, size_t aSize) {
+ MemoryInfo result;
+
+ result.mStart = uintptr_t(aPtr);
+ const char* ptr = reinterpret_cast<const char*>(aPtr);
+ const char* end = ptr + aSize;
+ DebugOnly<void*> base = nullptr;
+ while (ptr < end) {
+ MEMORY_BASIC_INFORMATION basicInfo;
+ if (!VirtualQuery(ptr, &basicInfo, sizeof(basicInfo))) {
+ break;
+ }
+
+ MOZ_ASSERT_IF(base, base == basicInfo.AllocationBase);
+ base = basicInfo.AllocationBase;
+
+ size_t regionSize =
+ std::min(size_t(basicInfo.RegionSize), size_t(end - ptr));
+
+ if (basicInfo.State == MEM_COMMIT) {
+ result.mCommitted += regionSize;
+ } else if (basicInfo.State == MEM_RESERVE) {
+ result.mReserved += regionSize;
+ } else if (basicInfo.State == MEM_FREE) {
+ result.mFree += regionSize;
+ } else {
+ MOZ_ASSERT_UNREACHABLE("Unexpected region state");
+ }
+ result.mSize += regionSize;
+ ptr += regionSize;
+
+ if (result.mType.isEmpty()) {
+ if (basicInfo.Type & MEM_IMAGE) {
+ result.mType += PageType::Image;
+ }
+ if (basicInfo.Type & MEM_MAPPED) {
+ result.mType += PageType::Mapped;
+ }
+ if (basicInfo.Type & MEM_PRIVATE) {
+ result.mType += PageType::Private;
+ }
+
+ // The first 8 bits of AllocationProtect are an enum. The remaining bits
+ // are flags.
+ switch (basicInfo.AllocationProtect & 0xff) {
+ case PAGE_EXECUTE_WRITECOPY:
+ result.mPerms += Perm::CopyOnWrite;
+ [[fallthrough]];
+ case PAGE_EXECUTE_READWRITE:
+ result.mPerms += Perm::Write;
+ [[fallthrough]];
+ case PAGE_EXECUTE_READ:
+ result.mPerms += Perm::Read;
+ [[fallthrough]];
+ case PAGE_EXECUTE:
+ result.mPerms += Perm::Execute;
+ break;
+
+ case PAGE_WRITECOPY:
+ result.mPerms += Perm::CopyOnWrite;
+ [[fallthrough]];
+ case PAGE_READWRITE:
+ result.mPerms += Perm::Write;
+ [[fallthrough]];
+ case PAGE_READONLY:
+ result.mPerms += Perm::Read;
+ break;
+
+ default:
+ break;
+ }
+
+ if (basicInfo.AllocationProtect & PAGE_GUARD) {
+ result.mPerms += Perm::Guard;
+ }
+ if (basicInfo.AllocationProtect & PAGE_NOCACHE) {
+ result.mPerms += Perm::NoCache;
+ }
+ if (basicInfo.AllocationProtect & PAGE_WRITECOMBINE) {
+ result.mPerms += Perm::WriteCombine;
+ }
+ }
+ }
+
+ result.mEnd = uintptr_t(ptr);
+ return result;
+}
+
+} // namespace mozilla