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Eclipse Plugin - Debugger - Automatically select the top stackframe [message #643977]

Wed, 08 December 2010 21:19

ncl

Messages: 6
Registered: December 2010

Junior Member

Hello,

I posted this in the "Newcomers" section, but was redirected here.
I'm writing a debugger as an eclipse plugin (using eclipse 3.6.1, windows XP and 7). Everything seems to work except for one thing: when a breakpoint is hit, or after a step, the top stack frame is not selected automatically (and thus, the associated source line is not highlighted). And, if I select it manually, after each step/continue, I have to select it again.
When the stack frame is manually selected, the correct source line is highlighted.
When a breakpoint is hit, I fire a DebugEvent with kind = DebugEvent.SUSPEND, detail = DebugEvent.BREAKPOINT. The source of the debug event is set to the thread in which the breakpoint is set.

After looking on the internet, I found these 2 links that did'nt help:
- http://dev.eclipse.org/mhonarc/lists/platform-debug-dev/msg0 1111.html
I have a source locator, a debug model presentation, and a text editor and they seem to work correctly since clicking on the stack frame highlights the correct source line.

- http://dev.eclipse.org/mhonarc/lists/platform-debug-dev/msg0 1249.html
After stepping in the eclipse source code, I arrive in ThreadEventHandler#fireDeltaUpdatingSelectedFrame which sets the IModelDelta.SELECT flag in the delta.

I've tried looking around a little more but I am not familiar enough with eclipse and its source. The farthest I could go was from TreeModelContentProvider#handleSelect to TreeModelViewer#internalExpand(Object, bool). The Object is the correct TreePath and the boolean is set to false.
In internal expand, the parent is asked to create the child widget (createChildren(pw)) but then, internalFindChild(pw,element) returns null. The parent widget does have a child but the child's data member is set to null.

Any idea ? What am I doing wrong ?

Thanks in advance.

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Re: Eclipse Plugin - Debugger - Automatically select the top stackframe [message #644632 is a reply to message #643977]

Mon, 13 December 2010 14:48

ncl

Messages: 6
Registered: December 2010

Junior Member

I'll reply to myself Smile

In case anyone else has the same problem.
In my case, I forgot to define a correct "equals" method for the stackframe. Now breakpoints are working correctly.
Step actions on the other hand are still not functioning properly...

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Re: Eclipse Plugin - Debugger - Automatically select the top stackframe [message #648854 is a reply to message #644632]

Fri, 14 January 2011 18:03

Lisa Jett

Messages: 14
Registered: July 2009

Junior Member

I am having a similar problem...can you point me to the area in the debugger platform code that utilizes the equals function you had to add?

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Re: Eclipse Plugin - Debugger - Automatically select the top stackframe [message #780675 is a reply to message #648854]

Wed, 18 January 2012 23:42

J. S. Pam

Messages: 3
Registered: January 2012

Junior Member

I also had a similar problem, and none of the solutions posted here and elsewhere worked. After much playing around, I found the cause: I was launching my interpreter (which is not an external program, but only a separate thread) using DebugPlugin.asyncExec(). This caused the debug event dispatch to be delayed until the interpreter finished executing.

It worked perfectly fine after deriving the interpreter runner from the Job class and using Job.schedule().

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