| // Copyright 2020 The Dawn Authors |
| // |
| // 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. |
| |
| #include <array> |
| #include <thread> |
| |
| #include "dawn/utils/PlatformDebugLogger.h" |
| |
| #include "dawn/common/Assert.h" |
| #include "dawn/common/windows_with_undefs.h" |
| |
| namespace utils { |
| |
| class WindowsDebugLogger : public PlatformDebugLogger { |
| public: |
| WindowsDebugLogger() : PlatformDebugLogger() { |
| if (IsDebuggerPresent()) { |
| // This condition is true when running inside Visual Studio or some other debugger. |
| // Messages are already printed there so we don't need to do anything. |
| return; |
| } |
| |
| mShouldExitHandle = CreateEventA(nullptr, TRUE, FALSE, nullptr); |
| ASSERT(mShouldExitHandle != nullptr); |
| |
| mThread = std::thread( |
| [](HANDLE shouldExit) { |
| // https://blogs.msdn.microsoft.com/reiley/2011/07/29/a-debugging-approach-to-outputdebugstring/ |
| // for the layout of this struct. |
| struct { |
| DWORD process_id; |
| char data[4096 - sizeof(DWORD)]; |
| }* dbWinBuffer = nullptr; |
| |
| HANDLE file = CreateFileMappingA(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, |
| sizeof(*dbWinBuffer), "DBWIN_BUFFER"); |
| ASSERT(file != nullptr); |
| ASSERT(file != INVALID_HANDLE_VALUE); |
| |
| dbWinBuffer = static_cast<decltype(dbWinBuffer)>( |
| MapViewOfFile(file, SECTION_MAP_READ, 0, 0, 0)); |
| ASSERT(dbWinBuffer != nullptr); |
| |
| HANDLE dbWinBufferReady = CreateEventA(nullptr, FALSE, FALSE, "DBWIN_BUFFER_READY"); |
| ASSERT(dbWinBufferReady != nullptr); |
| |
| HANDLE dbWinDataReady = CreateEventA(nullptr, FALSE, FALSE, "DBWIN_DATA_READY"); |
| ASSERT(dbWinDataReady != nullptr); |
| |
| std::array<HANDLE, 2> waitHandles = {shouldExit, dbWinDataReady}; |
| while (true) { |
| SetEvent(dbWinBufferReady); |
| DWORD wait = WaitForMultipleObjects(waitHandles.size(), waitHandles.data(), |
| FALSE, INFINITE); |
| if (wait == WAIT_OBJECT_0) { |
| break; |
| } |
| ASSERT(wait == WAIT_OBJECT_0 + 1); |
| fprintf(stderr, "%.*s\n", static_cast<int>(sizeof(dbWinBuffer->data)), |
| dbWinBuffer->data); |
| fflush(stderr); |
| } |
| |
| CloseHandle(dbWinDataReady); |
| CloseHandle(dbWinBufferReady); |
| UnmapViewOfFile(dbWinBuffer); |
| CloseHandle(file); |
| }, |
| mShouldExitHandle); |
| } |
| |
| ~WindowsDebugLogger() override { |
| if (IsDebuggerPresent()) { |
| // This condition is true when running inside Visual Studio or some other debugger. |
| // Messages are already printed there so we don't need to do anything. |
| return; |
| } |
| |
| if (mShouldExitHandle != nullptr) { |
| BOOL result = SetEvent(mShouldExitHandle); |
| ASSERT(result != 0); |
| CloseHandle(mShouldExitHandle); |
| } |
| |
| if (mThread.joinable()) { |
| mThread.join(); |
| } |
| } |
| |
| private: |
| std::thread mThread; |
| HANDLE mShouldExitHandle = INVALID_HANDLE_VALUE; |
| }; |
| |
| PlatformDebugLogger* CreatePlatformDebugLogger() { |
| return new WindowsDebugLogger(); |
| } |
| |
| } // namespace utils |