Re: [cdt-dev] How to get correct DebugElement from CDT Debug context

[John Cortell <rat042@xxxxxxxxxxxxx>]

JDT uses the the Standard Debug Model. CDT's CDI-GDB debugger does, 
too. DSF-GDB does not. The default debugger in CDT is DSF-GDB.

IWatchExpression objects are created by a DSF-GDB session but their 
use is superficial. They're not used to evaluate the expression as 
they are in JDT and CDI. In fact, there are numerous methods in 
IWatchExpression that are applicable only to Standard Debug Model sessions.

You have two options for supporting CDT. Support only CDI, or add 
code that will evaluate the expression in a DSF specific way (when 
dealing with a DSF session).

John

At 07:24 AM 2/15/2011, Tobias Tost wrote:
> Hello,
>
> I am trying to evalute some variable's context by IWatchExpression 
> and IWatchExpressionManager. Sadly, I'm not able to do this 
> successfully because of a different DebugContext-Behaviour.
>
> With JDE, this will be a valid IDebugElement:
>
> IAdaptable object = DebugUITools.getDebugContext();
>
> i.e. a StackFrame. Sadly, CDT returns a AbstractDMVMNode, which is 
> no DebugElement at all and thus I'm not able to use it as expression 
> context. I was hoping that something like this would do the trick:
>
> IExpressionManager expressionManager = 
> DebugPlugin.getDefault().getExpressionManager();
> IWatchExpression watchExpr = expressionManager.newWatchExpression("Foo");
> IAdaptable object = DebugUITools.getDebugContext();
> IDebugElement context = null;
> if (object instanceof IDebugElement) {
>     context = (IDebugElement) object;
> } else if (object instanceof ILaunch) {
>     context = ((ILaunch) object).getDebugTarget();
> }
> watchExpr.setExpressionContext(context);
> watchExpr.evaluate();
>
> How am I supposed to use this expression-interface? Even if things 
> like AbstractVMNode or GdbExpressionVMProvider would not be 
> internal, I don't get the architecture figured to a degree that I 
> would know what I had to do without an IDebugElement to use as context. :(
>
> Thanks in advance,
>
> Tobias
>
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