[Glass] Understanding GciTsContinueWith

[Iwan Vosloo]

Thank you Norm.

I get it now.

Regards
Iwan

On 2021/07/30 16:53, Norm Green via Glass wrote:
> The case of  (continueWithError != NULL)  could be used after the 
> execution has
> stopped at a breakpoint, and you want to continue from the breakpoint, 
> signalling some error
> other than the breakpoint.
> 
> The case of  (continueWithError==NULL && replaceTopOfStack 
> != OOP_ILLEGAL) could be
> used to replace self with some other object that would make sense in the 
> context of the
> method at the top of the stack.  For example if the top of stack 
> signalled an Error, you
> could possibly replace  self with an instance of Warning and continue 
> execution .
> 
> Replacing top of stack is  useful after you have used 
> GsProcess>>_trimStackToLevel:
> to trim signalling of an Error off of the stack and you want to alter 
> self within the method
> that is now at top of stack .
> 
> 
> 
> 
> On 7/30/2021 6:57 AM, Iwan Vosloo via Glass wrote:
>> Hi there,
>>
>> I am trying to figure out how to use GciTsContinueWith and I don't 
>> quite understand the comments (see below).
>>
>>
>> I can make it continue code after an exception (such as signalled from 
>> a halt), but only if I pass NULL to continueWithError.
>>
>> If I pass in the error (GciErrSType) obtained after, say a perform, I 
>> just keep getting the same error upon continuing.
>>
>> Perhaps what I don't understand is the idea here - what can I replace 
>> the top of stack with?
>>
>> I would like to understand enough to eventually be able to debug 
>> gemstone code (eg, step) via this interface. Can I do this via 
>> GciTsContinueWith?
>>
>> Thank you
>> Iwan
>>
>> /*============================================================================== 
>>
>>  *  GciTsContinueWith
>>  *
>>  *  result is OOP_ILLEGAL if an error was returned in *err .
>>  *
>>  *  If continueWithError is not NULL, continue execution by signalling 
>> this
>>  *  error and replaceTopOfStack must be OOP_ILLEGAL . In this case,
>>  *  top frame of stack must be AbstractException>>signal
>>  *  or   AbstractException >>_signalFromPrimitive .
>>  *
>>  *  Within *continueWithError, if continueWithError->exceptionObj is 
>> not OOP_NIL
>>  *  it is used to replace self in the top frame,
>>  *  otherwise continueWithError->number is used to construct a kind of
>>  *  AbstractException to replace self in the top frame.
>>  *  Then execution is restarted at start of top frame's method.
>>  *
>>  *  replaceTopOfStack == OOP_ILLEGAL means TopOfStack will not be changed
>>  */
>>
>>
> 
> 
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