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.NET Forum / .NET Framework / CLR / October 2006Conditional Breaks
Hi people, Q: Is there a way to add a conditional break, so that execution breaks if the value of a variable changes. A: Yes there is, silly. Q: But I want execution to halt whenever that variable changes, in ANY line throughout my code, without having to set a gazillion breakpoints in every line that accesses that variable. A: .....anyone???? Jeppe Jespersen Denmark Encapsulate your variable into a class, use a property or a method to change its value, set the breakpoint in the setter or method, and use the Call Stack window to locate the calling line. > Encapsulate your variable into a class, use a property or a method to > change > its value, set the breakpoint in the setter or method, and use the Call > Stack window to locate the calling line. Thank you all. Jeppe Jespersen Denmark I still don't have it clear... Is there (or isn't) a way to set breakpoint on managed variable change? A property requires change of code and even than - you need to compare to previous value and set the breakpoint only if the new value is different When I debug production code using windbg + sos.dll - how can I break when, for example, an Int32 variable has changed value? And in Visual Studio? Loy > > Encapsulate your variable into a class, use a property or a method to > > change [quoted text clipped - 5 lines] > Jeppe Jespersen > Denmark RTM http://msdn2.microsoft.com/en-us/library/350dyxd0.aspx What you want is a data breakpoint. These are only available in C++ navtive code . >I still don't have it clear... > [quoted text clipped - 19 lines] >> Jeppe Jespersen >> Denmark > RTM > http://msdn2.microsoft.com/en-us/library/350dyxd0.aspx > > What you want is a data breakpoint. These are only available in C++ > navtive code . The essential problem here is that, even though the JIT turns your managed code into native code, and the processor debug registers allow you to break when a memory location is written, the garbage collector will move your variable here, there, and everywhere and not adjust the address in the debug register. Maybe you can find a way using a pinning pointer. Or you could use a (global static) gcroot, set a data breakpoint on that to find out when your variable gets moved around in the gc heap, and then update the data breakpoint on the variable. That breakpoint would be hit once each time the gc collects your generation -- so probably not much fun to track by hand. >>I still don't have it clear... >> [quoted text clipped - 20 lines] >>> Jeppe Jespersen >>> Denmark Thanks Ben and Noah Seems like we need help from the sos.dll developers I know this is tricky due to heap compaction by the GC Your (Ben) point about memory hit by the GC itself is a good point I learned The complexity of this issue cry for help from Microsoft It would be highly appreciated if the next version of SOS will allow setting data breakpoint - and do all the necessary work to move the breakpoint and ignore GC itself reading the memory ... - behind the scenes I assume the same issue exists in Visual studio - and might explain why conditional breakpoints don't always work This is a needed tool while debugging and not having it make it harder to debug some issues in .net applications. Hope I'm not asking for too much Loy > > RTM > > http://msdn2.microsoft.com/en-us/library/350dyxd0.aspx [quoted text clipped - 36 lines] > >>> Jeppe Jespersen > >>> Denmark Can someone from MSFT give us insight? Loy > Thanks Ben and Noah > [quoted text clipped - 59 lines] > > >>> Jeppe Jespersen > > >>> Denmark > Hi people, > [quoted text clipped - 9 lines] > > A: .....anyone???? Does Debug -> New Breakpoint -> New Data Breakpoint... work for you? > Jeppe Jespersen > Denmark > Does Debug -> New Breakpoint -> New Data Breakpoint... work for you? I believe that's only for unmanaged (native) code. Then I would suggest that you implement the variable as a property and set the breakpoint in the setter method. > Q: But I want execution to halt whenever that variable changes, in ANY > line > throughout my code, without having to set a gazillion breakpoints in every > line that accesses that variable. > > A: .....anyone????
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