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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 https://mozilla.org/MPL/2.0/. */
#include "DllPrefetchExperimentRegistryInfo.h"
#include "mozilla/Assertions.h"
#include "mozilla/NativeNt.h"
#include "mozilla/ResultExtensions.h"
namespace mozilla {
const wchar_t DllPrefetchExperimentRegistryInfo::kExperimentSubKeyPath[] =
L"SOFTWARE"
L"\\" MOZ_APP_VENDOR L"\\" MOZ_APP_BASENAME L"\\DllPrefetchExperiment";
Result<Ok, nsresult> DllPrefetchExperimentRegistryInfo::Open() {
if (!!mRegKey) {
return Ok();
}
DWORD disposition;
HKEY rawKey;
LSTATUS result = ::RegCreateKeyExW(
HKEY_CURRENT_USER, kExperimentSubKeyPath, 0, nullptr,
REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, nullptr, &rawKey, &disposition);
if (result != ERROR_SUCCESS) {
return Err(NS_ERROR_UNEXPECTED);
}
mRegKey.own(rawKey);
if (disposition == REG_CREATED_NEW_KEY ||
disposition == REG_OPENED_EXISTING_KEY) {
return Ok();
}
MOZ_ASSERT_UNREACHABLE("Invalid disposition from RegCreateKeyExW");
return Err(NS_ERROR_UNEXPECTED);
}
Result<Ok, nsresult> DllPrefetchExperimentRegistryInfo::ReflectPrefToRegistry(
int32_t aVal) {
MOZ_TRY(Open());
mPrefetchMode = aVal;
LSTATUS status =
::RegSetValueExW(mRegKey.get(), mBinPath.get(), 0, REG_DWORD,
reinterpret_cast<PBYTE>(&aVal), sizeof(aVal));
if (status != ERROR_SUCCESS) {
return Err(NS_ERROR_UNEXPECTED);
}
return Ok();
}
Result<Ok, nsresult> DllPrefetchExperimentRegistryInfo::ReadRegistryValueData(
DWORD expectedType) {
MOZ_TRY(Open());
int32_t data;
DWORD dataLen = sizeof((ULONG)data);
DWORD type;
LSTATUS status =
::RegQueryValueExW(mRegKey.get(), mBinPath.get(), nullptr, &type,
reinterpret_cast<PBYTE>(&data), &dataLen);
if (status == ERROR_FILE_NOT_FOUND) {
// The registry key has not been created, set to default 0
mPrefetchMode = 0;
return Ok();
}
if (status != ERROR_SUCCESS) {
return Err(NS_ERROR_UNEXPECTED);
}
if (type != expectedType) {
return Err(NS_ERROR_UNEXPECTED);
}
mPrefetchMode = data;
return Ok();
}
AlteredDllPrefetchMode
DllPrefetchExperimentRegistryInfo::GetAlteredDllPrefetchMode() {
Result<Ok, nsresult> result = ReadRegistryValueData(REG_DWORD);
if (!result.isOk()) {
MOZ_ASSERT(false);
return AlteredDllPrefetchMode::CurrentPrefetch;
}
switch (mPrefetchMode) {
case 0:
return AlteredDllPrefetchMode::CurrentPrefetch;
case 1:
return AlteredDllPrefetchMode::NoPrefetch;
case 2:
return AlteredDllPrefetchMode::OptimizedPrefetch;
default:
MOZ_ASSERT(false);
return AlteredDllPrefetchMode::CurrentPrefetch;
}
}
} // namespace mozilla
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