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

chrome_frame/vectored_handler.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_H_
+#define CHROME_FRAME_VECTORED_HANDLER_H_
+
+// Base class for VectoredHandlerT just to hold some members (independent of
+// template parameter)
+class VectoredHandlerBase {
+ public: 
+  // For RtlCaptureStackBackTrace MSDN says:
+  // Windows Server 2003 and Windows XP:  The sum of the FramesToSkip and
+  // FramesToCapture parameters must be less than 64.
+  // In practice (on XPSP2) it has to be less than 63, hence leaving us with
+  // max back trace of 62.
+  static const DWORD max_back_trace = 62;
+  static unsigned long g_exceptions_seen;
+ protected:
+  static void* g_handler;
+};
+
+DECLSPEC_SELECTANY void* VectoredHandlerBase::g_handler;
+DECLSPEC_SELECTANY unsigned long VectoredHandlerBase::g_exceptions_seen;
+
+// The E class is supposed to provide external/API functions. Using template
+// make testability easier. It shall confirm the following concept/archetype:
+// void* Register(PVECTORED_EXCEPTION_HANDLER,
+//                const void* module_start, const void* module_end)
+// Registers Vectored Exception Handler, non-unittest implementation shall call
+// ::AddVectoredExceptionHandler Win32 API
+// ULONG Unregister(void*) - ::RemoveVectoredExceptionHandler Win32 API
+// int IsOurModule(const void* address) -
+// void WriteDump(EXCEPTION_POINTERS*) - 
+// WORD RtlCaptureStackBackTrace(..) - same as Win32 API
+// EXCEPTION_REGISTRATION_RECORD* RtlpGetExceptionList() - same as Win32 API
+// You may want to derive own External class by deriving from
+// VEHExternalBase helper (see below).
+// Create dump policy:
+// 1. Scan SEH chain, if there is a handler/filter that belongs to our
+//    module - assume we expect this one and hence do nothing here.
+// 2. If the address of the exception is in our module - create dump.
+// 3. If our module is in somewhere in callstack - create dump.
+template <class E>
+class VectoredHandlerT : public VectoredHandlerBase {
+ public:
+  static void* Register(const void* module_start, const void* module_end) {
+    g_exceptions_seen = 0;
+    g_handler = E::Register(&VectoredHandler, module_start, module_end);
+    return g_handler;
+  }
+
+  static ULONG Unregister() {
+    if (g_handler)
+      return E::Unregister(g_handler);
+    return 0;
+  }
+
+  static LONG WINAPI VectoredHandler(EXCEPTION_POINTERS* exceptionInfo);
+ private:
+  static BOOL ModuleHasInstalledSEHFilter();
+};
+
+// Handy class supposed to act as a base class for classes used as template
+// parameter of VectoredHandlerT<E>
+class VEHTraitsBase {
+ public:
+  static const void* g_module_start;
+  static const void* g_module_end;
+
+  static inline int IsOurModule(const void* address) {
+    return (g_module_start <= address && address < g_module_end);
+  }
+
+  static inline void SetModule(const void* module_start,
+                               const void* module_end) {
+    g_module_start = module_start;
+    g_module_end = module_end;
+  }
+};
+
+DECLSPEC_SELECTANY const void* VEHTraitsBase::g_module_start;
+DECLSPEC_SELECTANY const void* VEHTraitsBase::g_module_end;
+
+class Win32VEHTraits;
+typedef class VectoredHandlerT<Win32VEHTraits> VectoredHandler;
+#endif  // CHROME_FRAME_VECTORED_HANDLER_H_