PRB: CodeView Skips Over a Line of Source Code (46010)


The information in this article applies to:

  • Microsoft CodeView for MS-DOS 2.2
  • Microsoft CodeView for MS-DOS 3.0
  • Microsoft CodeView for MS-DOS 3.11
  • Microsoft CodeView for MS-DOS 3.14
  • Microsoft CodeView for MS-DOS 4.0
  • Microsoft CodeView for MS-DOS 4.01
  • Microsoft CodeView for MS-DOS 4.05
  • Microsoft CodeView for MS-DOS 4.1
  • Microsoft CodeView for Windows 3.0
  • Microsoft CodeView for Windows 3.05
  • Microsoft CodeView for Windows 3.06
  • Microsoft CodeView for Windows 3.07
  • Microsoft CodeView for Windows 4.0
  • Microsoft CodeView for Windows 4.01
  • Microsoft CodeView for Windows 4.1
This article was previously published under Q46010

SYMPTOMS

CodeView does not recognize a breakpoint set in an application. If you run the program, execution does not stop on the breakpoint. If you single-step through the code, CodeView steps past the specified line. This problem also occurs in the QuickC and Visual C++ integrated debuggers.

CAUSE

This behavior occurs because CodeView is line-based and the C compiler is token-based.

RESOLUTION

This restriction is inherent in the CodeView design. To work around this behavior, select mixed source code and assembly language mode and place the breakpoint on the correct line of assembly language code.

MORE INFORMATION

The following sample code can be used to demonstrate this problem.

Sample Code

     /*
    * Compile options needed: /Zi /Od
    */ 

   int i, j, k, l;

   void main(void)
   {
      for (i = 0; i < 20; i++)
      {
         j = 0;
         for (k = 0; k < 20; k++)
            if (j == 0)
               break;

         j = 1; /*** set breakpoint here ***/ 
      }

      l = 0;
   }
Modification Type:MajorLast Reviewed:10/23/2003
Keywords:kb16bitonly kbBug kbDebug kbprb KB46010
©2003 Microsoft Corporation. All rights reserved.