BUG: Cannot Step Over Function That Contains Data Breakpoint (200578)
The information in this article applies to:
- Microsoft Visual C++, 32-bit Enterprise Edition 5.0, when used with:
- Microsoft Visual C++, 32-bit Enterprise Edition 6.0, when used with:
- Microsoft Visual C++, 32-bit Professional Edition 5.0, when used with:
- Microsoft Visual C++, 32-bit Professional Edition 6.0, when used with:
- Microsoft Visual C++, 32-bit Learning Edition 6.0, when used with:
This article was previously published under Q200578 SYMPTOMS
If you attempt to step over a function that contains a data breakpoint anywhere in its execution path and the data expression does not evaluate to true, the Developer Studio debugger may step into the function or appear to hang.
CAUSE
The RISC implementation of the breakpoint handler fails to differentiate between normal breakpoints and data breakpoints, and handles the data breakpoints incorrectly.
RESOLUTION
Disable or remove all data breakpoints when stepping through code.
STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. MORE INFORMATION
Data breakpoints are discouraged on Windows NT RISC platforms because most of these architectures don't support debug breakpoint registers, resulting in extremely poor performance.
| Modification Type: | Major | Last Reviewed: | 12/2/2003 |
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| Keywords: | kbBug kbpending KB200578 |
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