# HG changeset patch
# User dcubed
# Date 1265132252 25200
# Node ID c75b48e6b2509032284a85b5f911a29da39d4e9a
# Parent  a70548606f736d16d43b16e52ecd4c692156c0fe
6918421: 1/1 in-process JVM now ignores preset Windows unhandled exception filter
Summary: Add support for chaining Windows UnhandledExceptionFilter handlers
Reviewed-by: kamg, dholmes, never, acorn, ikrylov

diff -r a70548606f73 -r c75b48e6b250 hotspot/src/os/windows/vm/os_windows.cpp
--- a/hotspot/src/os/windows/vm/os_windows.cpp	Wed Jan 13 09:39:46 2010 -0700
+++ b/hotspot/src/os/windows/vm/os_windows.cpp	Tue Feb 02 10:37:32 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -142,6 +142,9 @@
 }
 
 #ifndef _WIN64
+// previous UnhandledExceptionFilter, if there is one
+static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
+
 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
 #endif
 void os::init_system_properties_values() {
@@ -260,7 +263,8 @@
   }
 
 #ifndef _WIN64
-  SetUnhandledExceptionFilter(Handle_FLT_Exception);
+  // set our UnhandledExceptionFilter and save any previous one
+  prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
 #endif
 
   // Done
@@ -1909,7 +1913,7 @@
 #ifndef  _WIN64
 //-----------------------------------------------------------------------------
 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
-  // handle exception caused by native mothod modifying control word
+  // handle exception caused by native method modifying control word
   PCONTEXT ctx = exceptionInfo->ContextRecord;
   DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
 
@@ -1930,6 +1934,13 @@
         return EXCEPTION_CONTINUE_EXECUTION;
       }
   }
+
+  if (prev_uef_handler != NULL) {
+    // We didn't handle this exception so pass it to the previous
+    // UnhandledExceptionFilter.
+    return (prev_uef_handler)(exceptionInfo);
+  }
+
   return EXCEPTION_CONTINUE_SEARCH;
 }
 #else //_WIN64