kc3-lang/angle/src/common/system_utils_win.cpp

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• Hash : 2d3ce72d
  Author :
  Date : 2022-01-20T10:13:06
  

  Refactor shared library load to avoid allocations.
  
  Fixes a leak of an angle::Library detected in the EGL loader.
  
  Bug: angleproject:6937
  Change-Id: I623aa6172b98a35465e1d2641b92f67bdc5d24e7
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3403060
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/common/system_utils_win.cpp

• //
  // Copyright 2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // system_utils_win.cpp: Implementation of OS-specific functions for Windows
  
  #include "system_utils.h"
  
  #include <stdarg.h>
  #include <windows.h>
  #include <array>
  #include <vector>
  
  namespace angle
  {
  
  namespace
  {
  
  std::string GetPath(HMODULE module)
  {
      std::array<char, MAX_PATH> executableFileBuf;
      DWORD executablePathLen = GetModuleFileNameA(module, executableFileBuf.data(),
                                                   static_cast<DWORD>(executableFileBuf.size()));
      return (executablePathLen > 0 ? std::string(executableFileBuf.data()) : "");
  }
  
  std::string GetDirectory(HMODULE module)
  {
      std::string executablePath = GetPath(module);
      size_t lastPathSepLoc      = executablePath.find_last_of("\\/");
      return (lastPathSepLoc != std::string::npos) ? executablePath.substr(0, lastPathSepLoc) : "";
  }
  
  }  // anonymous namespace
  
  std::string GetExecutablePath()
  {
      return GetPath(nullptr);
  }
  
  std::string GetExecutableDirectory()
  {
      return GetDirectory(nullptr);
  }
  
  const char *GetSharedLibraryExtension()
  {
      return "dll";
  }
  
  Optional<std::string> GetCWD()
  {
      std::array<char, MAX_PATH> pathBuf;
      DWORD result = GetCurrentDirectoryA(static_cast<DWORD>(pathBuf.size()), pathBuf.data());
      if (result == 0)
      {
          return Optional<std::string>::Invalid();
      }
      return std::string(pathBuf.data());
  }
  
  bool SetCWD(const char *dirName)
  {
      return (SetCurrentDirectoryA(dirName) == TRUE);
  }
  
  const char *GetPathSeparatorForEnvironmentVar()
  {
      return ";";
  }
  
  double GetCurrentSystemTime()
  {
      LARGE_INTEGER frequency = {};
      QueryPerformanceFrequency(&frequency);
  
      LARGE_INTEGER curTime;
      QueryPerformanceCounter(&curTime);
  
      return static_cast<double>(curTime.QuadPart) / frequency.QuadPart;
  }
  
  double GetCurrentProcessCpuTime()
  {
      FILETIME creationTime = {};
      FILETIME exitTime     = {};
      FILETIME kernelTime   = {};
      FILETIME userTime     = {};
  
      // Note this will not give accurate results if the current thread is
      // scheduled for less than the tick rate, which is often 15 ms. In that
      // case, GetProcessTimes will not return different values, making it
      // possible to end up with 0 ms for a process that takes 93% of a core
      // (14/15 ms)!  An alternative is QueryProcessCycleTime but there is no
      // simple way to convert cycles back to seconds, and on top of that, it's
      // not supported pre-Windows Vista.
  
      // Returns 100-ns intervals, so we want to divide by 1e7 to get seconds
      GetProcessTimes(GetCurrentProcess(), &creationTime, &exitTime, &kernelTime, &userTime);
  
      ULARGE_INTEGER kernelInt64;
      kernelInt64.LowPart      = kernelTime.dwLowDateTime;
      kernelInt64.HighPart     = kernelTime.dwHighDateTime;
      double systemTimeSeconds = static_cast<double>(kernelInt64.QuadPart) * 1e-7;
  
      ULARGE_INTEGER userInt64;
      userInt64.LowPart      = userTime.dwLowDateTime;
      userInt64.HighPart     = userTime.dwHighDateTime;
      double userTimeSeconds = static_cast<double>(userInt64.QuadPart) * 1e-7;
  
      return systemTimeSeconds + userTimeSeconds;
  }
  
  bool IsDirectory(const char *filename)
  {
      WIN32_FILE_ATTRIBUTE_DATA fileInformation;
  
      BOOL result = GetFileAttributesExA(filename, GetFileExInfoStandard, &fileInformation);
      if (result)
      {
          DWORD attribs = fileInformation.dwFileAttributes;
          return (attribs != INVALID_FILE_ATTRIBUTES) && ((attribs & FILE_ATTRIBUTE_DIRECTORY) > 0);
      }
  
      return false;
  }
  
  bool IsDebuggerAttached()
  {
      return !!::IsDebuggerPresent();
  }
  
  void BreakDebugger()
  {
      __debugbreak();
  }
  
  const char *GetExecutableExtension()
  {
      return ".exe";
  }
  
  char GetPathSeparator()
  {
      return '\\';
  }
  
  std::string GetModuleDirectory()
  {
  // GetModuleHandleEx is unavailable on UWP
  #if !defined(ANGLE_IS_WINUWP)
      static int placeholderSymbol = 0;
      HMODULE module               = nullptr;
      if (GetModuleHandleExA(
              GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
              reinterpret_cast<LPCSTR>(&placeholderSymbol), &module))
      {
          return GetDirectory(module);
      }
  #endif
      return GetDirectory(nullptr);
  }
  
  std::string GetRootDirectory()
  {
      return "C:\\";
  }
  
  std::string GetLibraryPath(void *libraryHandle)
  {
      if (!libraryHandle)
      {
          return "";
      }
  
      std::array<char, MAX_PATH> buffer;
      if (GetModuleFileNameA(reinterpret_cast<HMODULE>(libraryHandle), buffer.data(),
                             buffer.size()) == 0)
      {
          return "";
      }
  
      return std::string(buffer.data());
  }
  
  void *GetLibrarySymbol(void *libraryHandle, const char *symbolName)
  {
      if (!libraryHandle)
      {
          fprintf(stderr, "Module was not loaded\n");
          return nullptr;
      }
  
      return reinterpret_cast<void *>(
          GetProcAddress(reinterpret_cast<HMODULE>(libraryHandle), symbolName));
  }
  
  void CloseSystemLibrary(void *libraryHandle)
  {
      if (libraryHandle)
      {
          FreeLibrary(reinterpret_cast<HMODULE>(libraryHandle));
      }
  }
  }  // namespace angle
  

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