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82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/win/com_init_util.h"
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#include <windows.h>
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#include <winternl.h>
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namespace base {
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namespace win {
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#if DCHECK_IS_ON()
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namespace {
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const char kComNotInitialized[] = "COM is not initialized on this thread.";
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// Derived from combase.dll.
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struct OleTlsData {
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enum ApartmentFlags {
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LOGICAL_THREAD_REGISTERED = 0x2,
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STA = 0x80,
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MTA = 0x140,
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};
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void* thread_base;
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void* sm_allocator;
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DWORD apartment_id;
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DWORD apartment_flags;
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// There are many more fields than this, but for our purposes, we only care
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// about |apartment_flags|. Correctly declaring the previous types allows this
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// to work between x86 and x64 builds.
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};
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OleTlsData* GetOleTlsData() {
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TEB* teb = NtCurrentTeb();
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return reinterpret_cast<OleTlsData*>(teb->ReservedForOle);
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}
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ComApartmentType GetComApartmentTypeForThread() {
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OleTlsData* ole_tls_data = GetOleTlsData();
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if (!ole_tls_data)
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return ComApartmentType::NONE;
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if (ole_tls_data->apartment_flags & OleTlsData::ApartmentFlags::STA)
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return ComApartmentType::STA;
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if ((ole_tls_data->apartment_flags & OleTlsData::ApartmentFlags::MTA) ==
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OleTlsData::ApartmentFlags::MTA) {
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return ComApartmentType::MTA;
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}
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return ComApartmentType::NONE;
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}
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} // namespace
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void AssertComInitialized(const char* message) {
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if (GetComApartmentTypeForThread() != ComApartmentType::NONE)
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return;
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// COM worker threads don't always set up the apartment, but they do perform
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// some thread registration, so we allow those.
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OleTlsData* ole_tls_data = GetOleTlsData();
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if (ole_tls_data && (ole_tls_data->apartment_flags &
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OleTlsData::ApartmentFlags::LOGICAL_THREAD_REGISTERED)) {
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return;
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}
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NOTREACHED() << (message ? message : kComNotInitialized);
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}
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void AssertComApartmentType(ComApartmentType apartment_type) {
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DCHECK_EQ(apartment_type, GetComApartmentTypeForThread());
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}
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#endif // DCHECK_IS_ON()
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} // namespace win
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} // namespace base
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