The Moldable DebuggerA Framework for Developing Domain-Specific Debuggers

Andrei ChișUniversity of Bern

@chis_andreiandreichis.com

Tudor GîrbaCompuGroup Medical

Schweiz AG

@girbatudorgirba.com

Oscar NierstraszUniversity of Bern

@onierstraszscg.unibe.ch/staff/oscar

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Debugging needs Motivating examples

The Moldable Debugger

Activation predicatesDomain-specificextensions

Roadmap

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Object-oriented applications use objects to express a model

of the business domain

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Mind the abstraction gap

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A publisher/subscriber framework

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2. Publish an event

aDispatcher

1. Subscribe for events

3. Deliver the event

aPublisher

aSubscriber aSubscriber aSubscriber

Pressing CMD+s in an editor

2. press CMD+s

aDispatcher

1. Register for CMD+s event

3. Deliver CMD+s event

aUser

aTextEditor...

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PetitParser

identifier letter , (letter / digit) *

letter *

,

/

letter digit

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IdentifierParser new parse: 'aLong32Identifier'

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The Moldable Debugger

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Debugging widgets

Debugging actions

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Next subscription

Selected subscription

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Next production

Next parser

Production(aproduction)

Next failure

Stream position(anInteger)

Stream position changed

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Domain specific-extension

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DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

Domain specific-extension

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DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

Domain specific-extension

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

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DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

StepToNextParser

StepToNextProduction

StepToNextFailure

...

Domain specific-extension

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Petit Parser Events

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Petit Parser Events

SUnit Glamour

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Size of extensions in LOC

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Activation predicate

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

ActivationPredicate

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Activation predicate

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

ActivationPredicate

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Petit Parser Events

SUnit Glamour

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Petit Parser Events

SUnit Glamour

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Petit Parser Events

SUnit Glamour

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Conclusions

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Mind the abstraction gap

Conclusions

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Mind the abstraction gap

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

ActivationPredicate

Conclusions

51

Mind the abstraction gap

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

ActivationPredicate

Conclusions

51

Mind the abstraction gap

DebuggingWidget

DebuggingView

DebuggingAction

DebuggingSession

DebuggingPredicate

PrimitivePredicate

HighLevelPredicate

***

ActivationPredicate

Conclusions

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gt.moosetechnology.org

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