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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/. */
#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
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