Initial import of the Chrome Frame codebase. Integration in chrome.gyp coming...

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_