Issue 162 - handle pure virtual function calls in VC++. r=mento

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@166 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/windows/handler/exception_handler.cc

@@ -64,6 +64,7 @@ ExceptionHandler::ExceptionHandler(const wstring &dump_path,
       minidump_write_dump_(NULL),
       installed_handler_(install_handler),
       previous_filter_(NULL),
+      previous_pch_(NULL),
       handler_thread_(0),
       handler_critical_section_(),
       handler_start_semaphore_(NULL),
@@ -124,6 +125,8 @@ ExceptionHandler::ExceptionHandler(const wstring &dump_path,
     previous_iph_ = _set_invalid_parameter_handler(HandleInvalidParameter);
 #endif  // _MSC_VER >= 1400
 
+    previous_pch_ = _set_purecall_handler(HandlePureVirtualCall);
+
     LeaveCriticalSection(&handler_stack_critical_section_);
   }
 }
@@ -142,6 +145,8 @@ ExceptionHandler::~ExceptionHandler() {
     _set_invalid_parameter_handler(previous_iph_);
 #endif  // _MSC_VER >= 1400
 
+    _set_purecall_handler(previous_pch_);
+
     if (handler_stack_->back() == this) {
       handler_stack_->pop_back();
     } else {
@@ -233,6 +238,7 @@ class AutoExceptionHandler {
 #if _MSC_VER >= 1400  // MSVC 2005/8
     _set_invalid_parameter_handler(handler_->previous_iph_);
 #endif  // _MSC_VER >= 1400
+    _set_purecall_handler(handler_->previous_pch_);
   }
 
   ~AutoExceptionHandler() {
@@ -241,6 +247,7 @@ class AutoExceptionHandler {
 #if _MSC_VER >= 1400  // MSVC 2005/8
     _set_invalid_parameter_handler(ExceptionHandler::HandleInvalidParameter);
 #endif  // _MSC_VER >= 1400
+    _set_purecall_handler(ExceptionHandler::HandlePureVirtualCall);
 
     EnterCriticalSection(&ExceptionHandler::handler_stack_critical_section_);
     --ExceptionHandler::handler_stack_index_;
@@ -349,6 +356,33 @@ void ExceptionHandler::HandleInvalidParameter(const wchar_t *expression,
 }
 #endif  // _MSC_VER >= 1400
 
+// static
+void ExceptionHandler::HandlePureVirtualCall() {
+  AutoExceptionHandler auto_exception_handler;
+  ExceptionHandler *current_handler = auto_exception_handler.get_handler();
+
+  MDRawAssertionInfo assertion;
+  memset(&assertion, 0, sizeof(assertion));
+  assertion.type = MD_ASSERTION_INFO_TYPE_PURE_VIRTUAL_CALL;
+
+  if (!current_handler->WriteMinidumpOnHandlerThread(NULL, &assertion)) {
+    if (current_handler->previous_pch_) {
+      // The handler didn't fully handle the exception.  Give it to the
+      // previous purecall handler.
+      current_handler->previous_pch_();
+    } else {
+      // If there's no previous handler, return and let _purecall handle it.
+      // This will just put up an assertion dialog.
+      return;
+    }
+  }
+
+  // The handler either took care of the invalid parameter problem itself,
+  // or passed it on to another handler.  "Swallow" it by exiting, paralleling
+  // the behavior of "swallowing" exceptions.
+  exit(0);
+}
+
 bool ExceptionHandler::WriteMinidumpOnHandlerThread(
     EXCEPTION_POINTERS *exinfo, MDRawAssertionInfo *assertion) {
   EnterCriticalSection(&handler_critical_section_);

src/client/windows/handler/exception_handler.h

@@ -183,6 +183,10 @@ class ExceptionHandler {
                                      uintptr_t reserved);
 #endif  // _MSC_VER >= 1400
 
+  // This function will be called by the CRT when a pure virtual
+  // function is called.
+  static void HandlePureVirtualCall();
+
   // This is called on the exception thread or on another thread that
   // the user wishes to produce a dump from.  It calls
   // WriteMinidumpWithException on the handler thread, avoiding stack
@@ -254,6 +258,10 @@ class ExceptionHandler {
   _invalid_parameter_handler previous_iph_;
 #endif  // _MSC_VER >= 1400
 
+  // The CRT allows you to override the default handler for pure
+  // virtual function calls.
+  _purecall_handler previous_pch_;
+
   // The exception handler thread.
   HANDLE handler_thread_;
 

src/google_breakpad/common/minidump_format.h

@@ -1046,13 +1046,17 @@ typedef struct {
   u_int32_t type;
 } MDRawAssertionInfo;
 
-/* For (MDRawAssertionInfo).info: */
+/* For (MDRawAssertionInfo).type: */
 typedef enum {
   MD_ASSERTION_INFO_TYPE_UNKNOWN = 0,
 
   /* Used for assertions that would be raised by the MSVC CRT but are
    * directed to an invalid parameter handler instead. */
-  MD_ASSERTION_INFO_TYPE_INVALID_PARAMETER
+  MD_ASSERTION_INFO_TYPE_INVALID_PARAMETER,
+
+  /* Used for assertions that would be raised by the MSVC CRT but are
+   * directed to a pure virtual call handler instead. */
+  MD_ASSERTION_INFO_TYPE_PURE_VIRTUAL_CALL
 } MDAssertionInfoData;
 
 #if defined(_MSC_VER)