| /* |
| * 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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