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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.
#ifndef BASE_WIN_COM_INIT_CHECK_HOOK_H_
#define BASE_WIN_COM_INIT_CHECK_HOOK_H_
#include "base/base_export.h"
#include "base/check_op.h"
#include "build/build_config.h"
namespace device {
class XrDeviceService;
} // namespace device
namespace base {
namespace win {
// Hotpatching is only supported in Intel 32-bit x86 processors because Windows
// binaries contain a convenient 2 byte hotpatch noop. This doesn't exist in
// 64-bit binaries.
#if DCHECK_IS_ON() && defined(ARCH_CPU_X86_FAMILY) && \
defined(ARCH_CPU_32_BITS) && !defined(OFFICIAL_BUILD) && \
!defined(COM_INIT_CHECK_HOOK_DISABLED) // See crbug/737090 for details.
#define COM_INIT_CHECK_HOOK_ENABLED
#endif
// Manages the installation of consistency DCHECK hooks of COM APIs that require
// COM to be initialized and only works if COM_INIT_CHECK_HOOK_ENABLED is
// defined. Care should be taken if this is instantiated with multiple threads
// running as the hotpatch does not apply atomically.
class BASE_EXPORT ComInitCheckHook {
public:
ComInitCheckHook();
ComInitCheckHook(const ComInitCheckHook&) = delete;
ComInitCheckHook& operator=(const ComInitCheckHook&) = delete;
~ComInitCheckHook();
private:
// For components that cannot use COM_INIT_CHECK_HOOK_DISABLED, call
// DisableCOMChecksForProcess() below. This should only be for code that calls
// into Windows components that don't explicitly initialize the MTA in the
// Windows thread pool.
friend class device::XrDeviceService;
static void DisableCOMChecksForProcess();
};
} // namespace win
} // namespace base
#endif // BASE_WIN_COM_INIT_CHECK_HOOK_H_
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