Refactoring of crash reporting code in Chrome Frame...

chrome_frame/vectored_handler-impl.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_FRAME_VECTORED_HANDLER_IMPL_H_
-#define CHROME_FRAME_VECTORED_HANDLER_IMPL_H_
-#include "chrome_frame/vectored_handler.h"
-
-#if defined(_M_IX86)
-typedef struct _EXCEPTION_REGISTRATION_RECORD {
-  struct _EXCEPTION_REGISTRATION_RECORD* Next;
-  PVOID Handler;
-} EXCEPTION_REGISTRATION_RECORD;
-#define EXCEPTION_CHAIN_END ((struct _EXCEPTION_REGISTRATION_RECORD*)-1)
-#else
-#error only x86 is supported for now.
-#endif
-
-
-// VEH handler flags settings.
-// These are grabbed from winnt.h for PocketPC.
-// Only EXCEPTION_NONCONTINUABLE in defined in "regular" winnt.h
-// #define EXCEPTION_NONCONTINUABLE 0x1    // Noncontinuable exception
-#define EXCEPTION_UNWINDING 0x2         // Unwind is in progress
-#define EXCEPTION_EXIT_UNWIND 0x4       // Exit unwind is in progress
-#define EXCEPTION_STACK_INVALID 0x8     // Stack out of limits or unaligned
-#define EXCEPTION_NESTED_CALL 0x10      // Nested exception handler call
-#define EXCEPTION_TARGET_UNWIND 0x20    // Target unwind in progress
-#define EXCEPTION_COLLIDED_UNWIND 0x40  // Collided exception handler call
-
-#define EXCEPTION_UNWIND (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND | \
-    EXCEPTION_TARGET_UNWIND | EXCEPTION_COLLIDED_UNWIND)
-
-#define IS_UNWINDING(Flag)  (((Flag) & EXCEPTION_UNWIND) != 0)
-#define IS_DISPATCHING(Flag)  (((Flag) & EXCEPTION_UNWIND) == 0)
-#define IS_TARGET_UNWIND(Flag)  ((Flag) & EXCEPTION_TARGET_UNWIND)
-// End of grabbed section
-
-template <class E>
-LONG WINAPI VectoredHandlerT<E>::VectoredHandler(
-    EXCEPTION_POINTERS* exceptionInfo) {
-  // TODO(stoyan): Consider reentrancy
-  const DWORD exceptionCode = exceptionInfo->ExceptionRecord->ExceptionCode;
-
-  // Not interested in non-error exceptions. In this category falls exceptions
-  // like:
-  // 0x40010006 - OutputDebugStringA. Seen when no debugger is attached
-  //              (otherwise debugger swallows the exception and prints
-  //              the string).
-  // 0x406D1388 - DebuggerProbe. Used by debug CRT - for example see source
-  //              code of isatty(). Used to name a thread as well.
-  // RPC_E_DISCONNECTED and Co. - COM IPC non-fatal warnings
-  // STATUS_BREAKPOINT and Co. - Debugger related breakpoints
-
-  if ((exceptionCode & ERROR_SEVERITY_ERROR) != ERROR_SEVERITY_ERROR) {
-    return ExceptionContinueSearch;
-  }
-
-  ++VectoredHandlerT<E>::g_exceptions_seen;
-
-  // TODO(stoyan): Check whether exception address is inbetween
-  // [IsBadReadPtr, IsBadReadPtr + 0xXX]
-
-  const DWORD exceptionFlags = exceptionInfo->ExceptionRecord->ExceptionFlags;
-  // I don't think VEH is called on unwind. Just to be safe.
-  if (IS_DISPATCHING(exceptionFlags)) {
-    if (ModuleHasInstalledSEHFilter())
-      return ExceptionContinueSearch;
-
-    if (E::IsOurModule(exceptionInfo->ExceptionRecord->ExceptionAddress)) {
-      E::WriteDump(exceptionInfo);
-      return ExceptionContinueSearch;
-    }
-
-    // See whether our module is somewhere in the call stack.
-    void* back_trace[max_back_trace] = {0};
-    // Skip RtlCaptureStackBackTrace and VectoredHandler itself.
-    DWORD captured = E::RtlCaptureStackBackTrace(2, max_back_trace - 2, 
-                                                 &back_trace[0], NULL);
-    for (DWORD i = 0; i < captured; ++i) {
-     if (E::IsOurModule(back_trace[i])) {
-       E::WriteDump(exceptionInfo);
-       return ExceptionContinueSearch;
-     }
-    }
-  }
-
-  return ExceptionContinueSearch;
-}
-
-template <class E>
-BOOL VectoredHandlerT<E>::ModuleHasInstalledSEHFilter() {
-  EXCEPTION_REGISTRATION_RECORD* RegistrationFrame = E::RtlpGetExceptionList();
-  // TODO(stoyan): Add the stack limits check and some sanity checks like
-  // decreasing addresses of registration records
-  while (RegistrationFrame != EXCEPTION_CHAIN_END) {
-    if (E::IsOurModule(RegistrationFrame->Handler)) {
-      return TRUE;
-    }
-
-    RegistrationFrame = RegistrationFrame->Next;
-  }
-
-  return FALSE;
-}
-#endif  // CHROME_FRAME_VECTORED_HANDLER_IMPL_H_