/*
 * Copyright (c) 2017 The Khronos Group Inc.
 * Copyright (c) 2017 Valve Corporation
 * Copyright (c) 2017 LunarG, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author: Lenny Komow <lenny@lunarg.com>
 */

 // This code is used to pass on physical device extensions through the call chain. It must do this without creating a stack frame,
 // because the actual parameters of the call are not known. Since the first parameter is known to be a VkPhysicalDevice, it can
// unwrap the physical device, overwriting the wrapped device, and then jump to the next function in the call chain. This code
// attempts to accomplish this by relying on tail-call optimizations, but there is no guarantee that this will work. As a result,
// this code is only compiled on systems where an assembly alternative has not been written.

 #include "vk_loader_platform.h"
 #include "loader.h"

 #if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC optimize(3)  // force gcc to use tail-calls
 #endif

 // Trampoline function macro for unknown physical device extension command.
 #define PhysDevExtTramp(num)                                                              \
     VKAPI_ATTR void VKAPI_CALL vkPhysDevExtTramp##num(VkPhysicalDevice physical_device) { \
         const struct loader_instance_dispatch_table *disp;                                \
         disp = loader_get_instance_dispatch(physical_device);                             \
         disp->phys_dev_ext[num](loader_unwrap_physical_device(physical_device));          \
     }

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