DOCUMENT:Q164949  04-AUG-2001  [visualc]
TITLE   :FIX: Visual C++ Debugger Crashes on Very Long Symbols
PRODUCT :Microsoft C Compiler
PROD/VER:4.2
OPER/SYS:
KEYWORDS:kbDebug kbide kbVC500fix

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

 - Microsoft Visual C++, version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you place the caret on a line that contains a very long symbol name while
you are debugging an application using Visual C++ in disassembly view, the
debugger may crash.

A possible error message is:

   

   [ASCII 147]MSDEV caused an invalid page fault in module <unknown> at
   00de:676e6972[ASCII 148]

CAUSE
=====

This behavior occurs because the debugger currently has a limit of 255
characters for symbols.

RESOLUTION
==========

1. Do not use the disassembly view to step through sections of code where very
   long symbol names are present.

-or-

2. Do not let the caret land on a line with a very long symbol name. Use the
   mouse to place the caret on a line following the one with the long symbol
   name, and select Run to Cursor from the Debug menu.

-or-

3. Reduce the size of the mangled symbol names. You can do this by shortening
   the names of classes and class members. You can also shorten class names of
   classes that you have not written by using a #define before the #include for
   the header declaring the class. If the class name is basic_string and you
   want to shorten it to BS, then insert "#define basic_string BS" before the
   #include for the header declaring basic_string.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug was corrected in Visual C++ version 5.0. The
limit is now (256+128).

REFERENCES
==========

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

         /* Compile options needed: /GX
         */ 

         #pragma warning(disable:4786)
         #include <string>
         #include <map>
         struct ThreeString
         {
             string s1,s2,s3;
             ThreeString(string i1,string i2,string i3) {
                 s1 = i1;
                 s2 = i2;
                 s3 = i3;
             }
             ThreeString() {}
         };
         typedef map<string, ThreeString, less<string>,
         allocator<ThreeString> > MapType;

         void main()
         {
             MapType themap;

             themap["Zero"] = ThreeString("Zero","Zero","Zero");
             themap["One"] = ThreeString("One","One","One");
         }

Additional query words:

======================================================================
Keywords          : kbDebug kbide kbVC500fix 
Technology        : kbVCsearch kbVC400 kbAudDeveloper
Version           : 4.2
Issue type        : kbbug
Solution Type     : kbfix

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

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