Q120967: BUG: Try Blocks Within a Switch Statement Behave Incorrectly

Article: Q120967
Product(s): Microsoft C Compiler
Version(s): 2.0,4.0,4.1,4.2,5.0,6.0
Operating System(s): 
Keyword(s): kbcode kbCompiler kbCPPonly kbVC kbVC200bug kbVC400bug kbVC410 kbVC420bug kbVC500bug kb
Last Modified: 13-FEB-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- The C/C++ Compiler (CL.EXE), used with:
   - Microsoft Visual C++, 32-bit Editions, versions 2.0, 4.0, 4.1, 4.2, 5.0, 6.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

A try block within a switch statement may cause the exception to be handled
incorrectly, as illustrated by the sample code in the MORE INFORMATION section
below.

CAUSE
=====

The compiler doesn't recognize catch blocks within the switch statement.
Therefore, the compiler attempts to link the try block to the next catch block
outside the switch. In the sample code in the More Information section below,
the second catch block is executed after the exception is thrown.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

MORE INFORMATION
================

Sample Code
-----------

The following sample code demonstrates the problem:

  /* Compile options needed: /GX
  */ 

  #include <stdio.h>

  void main(void)
  {
     int i = 0;

     try
     {
        switch ( i )
        try
        {
           case 0:
              throw i;
        }
        catch( int )
        {
        /* Should be caught here but isn't */ 
           printf( "Passed.\n" );
        }
     }
     catch (...)
     {
     /* Is caught here incorrectly */ 
        printf( "Failed.\n" );
     }
  }

Additional query words: kbVC400bug 9.00 10.00 10.10 10.20 exception handling

======================================================================
Keywords          : kbcode kbCompiler kbCPPonly kbVC kbVC200bug kbVC400bug kbVC410 kbVC420bug kbVC500bug kbVC600bug kbNoUpdate 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : :2.0,4.0,4.1,4.2,5.0,6.0
Issue type        : kbbug

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.