kc3-lang/angle/util/windows/win32/test_utils_win32.cpp

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• Hash : 3d8dff0a
  Author :
  Date : 2025-08-26T20:23:21
  

  Suppress unsafe buffers on a file-by-file basis in util/
  
  Bug: b/436880895
  Change-Id: I299247e38853bb16afd466e3f6521342c0a2b0f8
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6891980
  Auto-Submit: Tom Sepez <tsepez@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  

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• util/windows/win32/test_utils_win32.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.
  //
  
  // test_utils_win32.cpp: Implementation of OS-specific functions for Win32 (Windows)
  
  #ifdef UNSAFE_BUFFERS_BUILD
  #    pragma allow_unsafe_buffers
  #endif
  
  #include "util/test_utils.h"
  
  #include <windows.h>
  #include <array>
  
  #include "util/windows/third_party/StackWalker/src/StackWalker.h"
  
  namespace angle
  {
  namespace
  {
  static const struct
  {
      const char *name;
      const DWORD code;
  } kExceptions[] = {
  #define _(E)  \
      {         \
  #        E, E \
      }
      _(EXCEPTION_ACCESS_VIOLATION),
      _(EXCEPTION_BREAKPOINT),
      _(EXCEPTION_INT_DIVIDE_BY_ZERO),
      _(EXCEPTION_STACK_OVERFLOW),
  #undef _
  };
  
  class CustomStackWalker : public StackWalker
  {
    public:
      CustomStackWalker() {}
      ~CustomStackWalker() override {}
  
      void OnCallstackEntry(CallstackEntryType eType, CallstackEntry &entry) override
      {
          char buffer[STACKWALK_MAX_NAMELEN];
          size_t maxLen = _TRUNCATE;
          if ((eType != lastEntry) && (entry.offset != 0))
          {
              if (entry.name[0] == 0)
                  strncpy_s(entry.name, STACKWALK_MAX_NAMELEN, "(function-name not available)",
                            _TRUNCATE);
              if (entry.undName[0] != 0)
                  strncpy_s(entry.name, STACKWALK_MAX_NAMELEN, entry.undName, _TRUNCATE);
              if (entry.undFullName[0] != 0)
                  strncpy_s(entry.name, STACKWALK_MAX_NAMELEN, entry.undFullName, _TRUNCATE);
              if (entry.lineFileName[0] == 0)
              {
                  strncpy_s(entry.lineFileName, STACKWALK_MAX_NAMELEN, "(filename not available)",
                            _TRUNCATE);
                  if (entry.moduleName[0] == 0)
                      strncpy_s(entry.moduleName, STACKWALK_MAX_NAMELEN,
                                "(module-name not available)", _TRUNCATE);
                  _snprintf_s(buffer, maxLen, "    %s - %p (%s): %s\n", entry.name,
                              reinterpret_cast<void *>(entry.offset), entry.moduleName,
                              entry.lineFileName);
              }
              else
                  _snprintf_s(buffer, maxLen, "    %s (%s:%d)\n", entry.name, entry.lineFileName,
                              entry.lineNumber);
              buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
              printf("%s", buffer);
              OutputDebugStringA(buffer);
          }
      }
  };
  
  void PrintBacktrace(CONTEXT *c)
  {
      printf("Backtrace:\n");
      OutputDebugStringA("Backtrace:\n");
  
      CustomStackWalker sw;
      sw.ShowCallstack(GetCurrentThread(), c);
  }
  
  LONG WINAPI StackTraceCrashHandler(EXCEPTION_POINTERS *e)
  {
      const DWORD code = e->ExceptionRecord->ExceptionCode;
      printf("\nCaught exception %lu", code);
      for (size_t i = 0; i < ArraySize(kExceptions); i++)
      {
          if (kExceptions[i].code == code)
          {
              printf(" %s", kExceptions[i].name);
          }
      }
      printf("\n");
  
      PrintBacktrace(e->ContextRecord);
  
      // Exit NOW.  Don't notify other threads, don't call anything registered with atexit().
      _exit(1);
  
      // The compiler wants us to return something.  This is what we'd do if we didn't _exit().
      return EXCEPTION_EXECUTE_HANDLER;
  }
  
  CrashCallback *gCrashHandlerCallback;
  
  LONG WINAPI CrashHandler(EXCEPTION_POINTERS *e)
  {
      if (gCrashHandlerCallback)
      {
          (*gCrashHandlerCallback)();
      }
      return StackTraceCrashHandler(e);
  }
  }  // namespace
  
  void SetLowPriorityProcess()
  {
      ::SetPriorityClass(::GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS);
  }
  
  bool StabilizeCPUForBenchmarking()
  {
      if (::SetThreadAffinityMask(::GetCurrentThread(), 1) == 0)
      {
          return false;
      }
      if (::SetPriorityClass(::GetCurrentProcess(), REALTIME_PRIORITY_CLASS) == FALSE)
      {
          return false;
      }
      if (::SetThreadPriority(::GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL) == FALSE)
      {
          return false;
      }
  
      return true;
  }
  
  void PrintStackBacktrace()
  {
      CONTEXT context;
      ZeroMemory(&context, sizeof(CONTEXT));
      RtlCaptureContext(&context);
      PrintBacktrace(&context);
  }
  
  void InitCrashHandler(CrashCallback *callback)
  {
      if (callback)
      {
          gCrashHandlerCallback = callback;
      }
      SetUnhandledExceptionFilter(CrashHandler);
  }
  
  void TerminateCrashHandler()
  {
      gCrashHandlerCallback = nullptr;
      SetUnhandledExceptionFilter(nullptr);
  }
  
  int NumberOfProcessors()
  {
      // A portable implementation could probably use GetLogicalProcessorInformation
      return ::GetActiveProcessorCount(ALL_PROCESSOR_GROUPS);
  }
  }  // namespace angle
  

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