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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/scoped_com_initializer.h"
#include <wrl/implements.h>
#include <ostream>
#include "base/check_op.h"
#include "base/win/resource_exhaustion.h"
namespace base {
namespace win {
ScopedCOMInitializer::ScopedCOMInitializer(Uninitialization uninitialization) {
Initialize(COINIT_APARTMENTTHREADED, uninitialization);
}
ScopedCOMInitializer::ScopedCOMInitializer(SelectMTA mta,
Uninitialization uninitialization) {
Initialize(COINIT_MULTITHREADED, uninitialization);
}
ScopedCOMInitializer::~ScopedCOMInitializer() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (Succeeded()) {
if (com_balancer_) {
com_balancer_->Disable();
com_balancer_.Reset();
}
CoUninitialize();
}
}
bool ScopedCOMInitializer::Succeeded() const {
return SUCCEEDED(hr_);
}
DWORD ScopedCOMInitializer::GetCOMBalancerReferenceCountForTesting() const {
if (com_balancer_) {
return com_balancer_->GetReferenceCountForTesting();
}
return 0;
}
void ScopedCOMInitializer::Initialize(COINIT init,
Uninitialization uninitialization) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// COINIT_DISABLE_OLE1DDE is always added based on:
// https://docs.microsoft.com/en-us/windows/desktop/learnwin32/initializing-the-com-library
if (uninitialization == Uninitialization::kBlockPremature) {
com_balancer_ = Microsoft::WRL::Details::Make<internal::ComInitBalancer>(
init | COINIT_DISABLE_OLE1DDE);
}
hr_ = ::CoInitializeEx(nullptr, init | COINIT_DISABLE_OLE1DDE);
DCHECK_NE(RPC_E_CHANGED_MODE, hr_) << "Invalid COM thread model change";
// CoInitializeEx may call RegisterClassEx to get an ATOM. On failure, the
// call to RegisterClassEx sets the last error code to
// ERROR_NOT_ENOUGH_MEMORY. CoInitializeEx is retuning the converted error
// code (a.k.a HRESULT_FROM_WIN32(...)). The following code handles the case
// where HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY) is being returned by
// CoInitializeEx. We assume they are due to ATOM exhaustion. This appears to
// happen most often when the browser is being driven by automation tools,
// though the underlying reason for this remains a mystery
// (https://crbug.com/1470483). There is nothing that Chrome can do to
// meaningfully run until the user restarts their session by signing out of
// Windows or restarting their computer.
if (init == COINIT_APARTMENTTHREADED &&
hr_ == HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY)) {
base::win::OnResourceExhausted();
}
}
} // namespace win
} // namespace base
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