remove OS::StackWalk

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index ea4f7ea11f4177bdbee4f5de2dca570e50985741..073b21a011aae732b7db5dc15ca3b18c85e3858b 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -1208,133 +1208,9 @@ void OS::SignalCodeMovingGC() {
 }
 
 
-// Walk the stack using the facilities in dbghelp.dll and tlhelp32.dll
-
-// Switch off warning 4748 (/GS can not protect parameters and local variables
-// from local buffer overrun because optimizations are disabled in function) as
-// it is triggered by the use of inline assembler.
-#pragma warning(push)
-#pragma warning(disable : 4748)
-int OS::StackWalk(Vector<OS::StackFrame> frames) {
-  BOOL ok;
-
-  // Load the required functions from DLL's.
-  if (!LoadDbgHelpAndTlHelp32()) return kStackWalkError;
-
-  // Get the process and thread handles.
-  HANDLE process_handle = GetCurrentProcess();
-  HANDLE thread_handle = GetCurrentThread();
-
-  // Read the symbols.
-  if (!LoadSymbols(Isolate::Current(), process_handle)) return kStackWalkError;
-
-  // Capture current context.
-  CONTEXT context;
-  RtlCaptureContext(&context);
-
-  // Initialize the stack walking
-  STACKFRAME64 stack_frame;
-  memset(&stack_frame, 0, sizeof(stack_frame));
-#ifdef  _WIN64
-  stack_frame.AddrPC.Offset = context.Rip;
-  stack_frame.AddrFrame.Offset = context.Rbp;
-  stack_frame.AddrStack.Offset = context.Rsp;
-#else
-  stack_frame.AddrPC.Offset = context.Eip;
-  stack_frame.AddrFrame.Offset = context.Ebp;
-  stack_frame.AddrStack.Offset = context.Esp;
-#endif
-  stack_frame.AddrPC.Mode = AddrModeFlat;
-  stack_frame.AddrFrame.Mode = AddrModeFlat;
-  stack_frame.AddrStack.Mode = AddrModeFlat;
-  int frames_count = 0;
-
-  // Collect stack frames.
-  int frames_size = frames.length();
-  while (frames_count < frames_size) {
-    ok = _StackWalk64(
-        IMAGE_FILE_MACHINE_I386,    // MachineType
-        process_handle,             // hProcess
-        thread_handle,              // hThread
-        &stack_frame,               // StackFrame
-        &context,                   // ContextRecord
-        NULL,                       // ReadMemoryRoutine
-        _SymFunctionTableAccess64,  // FunctionTableAccessRoutine
-        _SymGetModuleBase64,        // GetModuleBaseRoutine
-        NULL);                      // TranslateAddress
-    if (!ok) break;
-
-    // Store the address.
-    ASSERT((stack_frame.AddrPC.Offset >> 32) == 0);  // 32-bit address.
-    frames[frames_count].address =
-        reinterpret_cast<void*>(stack_frame.AddrPC.Offset);
-
-    // Try to locate a symbol for this frame.
-    DWORD64 symbol_displacement;
-    SmartArrayPointer<IMAGEHLP_SYMBOL64> symbol(
-        NewArray<IMAGEHLP_SYMBOL64>(kStackWalkMaxNameLen));
-    if (symbol.is_empty()) return kStackWalkError;  // Out of memory.
-    memset(*symbol, 0, sizeof(IMAGEHLP_SYMBOL64) + kStackWalkMaxNameLen);
-    (*symbol)->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
-    (*symbol)->MaxNameLength = kStackWalkMaxNameLen;
-    ok = _SymGetSymFromAddr64(process_handle,             // hProcess
-                              stack_frame.AddrPC.Offset,  // Address
-                              &symbol_displacement,       // Displacement
-                              *symbol);                   // Symbol
-    if (ok) {
-      // Try to locate more source information for the symbol.
-      IMAGEHLP_LINE64 Line;
-      memset(&Line, 0, sizeof(Line));
-      Line.SizeOfStruct = sizeof(Line);
-      DWORD line_displacement;
-      ok = _SymGetLineFromAddr64(
-          process_handle,             // hProcess
-          stack_frame.AddrPC.Offset,  // dwAddr
-          &line_displacement,         // pdwDisplacement
-          &Line);                     // Line
-      // Format a text representation of the frame based on the information
-      // available.
-      if (ok) {
-        SNPrintF(MutableCStrVector(frames[frames_count].text,
-                                   kStackWalkMaxTextLen),
-                 "%s %s:%d:%d",
-                 (*symbol)->Name, Line.FileName, Line.LineNumber,
-                 line_displacement);
-      } else {
-        SNPrintF(MutableCStrVector(frames[frames_count].text,
-                                   kStackWalkMaxTextLen),
-                 "%s",
-                 (*symbol)->Name);
-      }
-      // Make sure line termination is in place.
-      frames[frames_count].text[kStackWalkMaxTextLen - 1] = '\0';
-    } else {
-      // No text representation of this frame
-      frames[frames_count].text[0] = '\0';
-
-      // Continue if we are just missing a module (for non C/C++ frames a
-      // module will never be found).
-      int err = GetLastError();
-      if (err != ERROR_MOD_NOT_FOUND) {
-        break;
-      }
-    }
-
-    frames_count++;
-  }
-
-  // Return the number of frames filled in.
-  return frames_count;
-}
-
-
-// Restore warnings to previous settings.
-#pragma warning(pop)
-
 #else  // __MINGW32__
 void OS::LogSharedLibraryAddresses(Isolate* isolate) { }
 void OS::SignalCodeMovingGC() { }
-int OS::StackWalk(Vector<OS::StackFrame> frames) { return 0; }
 #endif  // __MINGW32__