Atmosphere/libraries/libmesosphere/include/mesosphere/kern_build_config.hpp
Michael Scire bfffe6b119 kern: devirtualize KAutoObject::DynamicCast<>()
This is an optimization that saves the most common type of virtual call in the kernel (DynamicCast)
by storing class token as a member, rather than getting it via virtual call every time.

This does not currently cost any memory space on 64-bit targets, due to pre-existing padding space.

This optimization can be turned off via a compile-time flag for accuracy.
2021-10-16 16:24:06 -07:00

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#if defined(AMS_BUILD_FOR_AUDITING)
#define MESOSPHERE_BUILD_FOR_AUDITING
#endif
#if defined(MESOSPHERE_BUILD_FOR_AUDITING) || defined(AMS_BUILD_FOR_DEBUGGING)
#define MESOSPHERE_BUILD_FOR_DEBUGGING
#endif
#ifdef MESOSPHERE_BUILD_FOR_DEBUGGING
#define MESOSPHERE_ENABLE_ASSERTIONS
#define MESOSPHERE_ENABLE_DEBUG_PRINT
#define MESOSPHERE_ENABLE_KERNEL_STACK_USAGE
#endif
//#define MESOSPHERE_BUILD_FOR_TRACING
#define MESOSPHERE_ENABLE_PANIC_REGISTER_DUMP
#define MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP
/* NOTE: This enables fast class token storage using a class member. */
/* This saves a virtual call when doing KAutoObject->DynCast<>(), */
/* at the cost of storing class tokens inside the class object. */
/* However, as of (10/16/2021) KAutoObject has an unused class member */
/* of the right side, and so this does not actually cost any space. */
#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST