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Object-Centric Debugging: a preview
Steven Costiou [email protected] RMoDInria Lille - Nord Europe
2019
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Part I Object-Centric Debugging
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Demo
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What is object-centric debugging?
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Object-centric debugging
• Debugging operations at the level of objects
• Only target objects are affected
• Examples:
• A breakpoint active for one object only
• A method available for one object only
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Why object-centric debugging?
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Why Object-centric debugging?
• Debugging one object among many:
• Collections (Hinkle, Jones, Johnson, 1993)
• Events
• Graphical objects
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Object-Centric Features (preview)
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Object-centric breakpoints
• Break when a message is received
• haltOnCall => on every method call
• haltOnCall: #selector => for given selector only
• haltOnNextCall => on next method call
• haltOnceOnCall: #selector => only once for given selector
• haltOnCallWhen: condition => if condition is met
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Object-centric breakpoints
• Break on state access
• haltOnWriteTo: #instVarName => when instVarName is written
• haltOnRead: #instVarName => when instVarName is read
• haltOnWrite => when any instance variable is written
• haltOnRead => when any instance variable is read
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Object-centric behavior
• Object-centric methods
• compile: sourceCode => compiles and add new methods
• uses: aTrait => acquires behavior from Trait
• acquire: aCompiledMethod => acquire the method
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Object-centric debugging, how is it implemented?
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Implementation
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Object-centric breakpoints
Object-centricbehavior
Implementation
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Reflectivity
Proxies
Object-centric breakpoints
Object-centricbehavior
Implementation
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Reflectivity
Proxies
Talents
Object-centric breakpoints
Object-centricbehavior
Implementation
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Reflectivity
Proxies
Talents
AnonymousClasses
Object-centric breakpoints
Object-centricbehavior
Implementation
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Reflectivity
Proxies
Talents
AnonymousClasses
Object-centric breakpoints
Object-centricbehavior
Object-centric … ???
Implementation goal
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Reflectivity Proxies Talents
AnonymousClasses
Object-centric breakpoints
Object-centricbehavior
Object-centric layer
Object-centric…
Current problems
• Implementation is mixing up different techniques without any clear interaction model
• Requires to migrate the object to an anonymous subclass
• Installation of object-centric instrumentation is not thread-safe
• Sometimes make tools unstable
• Obtaining objects to debug (but work has been done on that…)
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Part II Object-Centric Reverse Debugging
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Demo
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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Reverse object-centric debugger
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WIP
Reverse object-centric debugger
• AST interpreter - Carolina Hernandez Phillips
• Reverse-execution - Vincent Aranega, Steven Costiou
• Object-centric debugger - Steven Costiou
• Scriptable debugger - Thomas Dupriez
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Who’s working on it?
Thanks! Questions?
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Object-Centric Reverse Debugging
Object-Centric Debugging
• haltOnCall • haltOnCall: #selector • haltOnNextCall • haltOnceOnCall: #selector • haltOnCallWhen: condition • haltOnWriteTo: #instVarName • haltOnRead: #instVarName • haltOnWrite • haltOnRead
• compile: sourceCode • uses: aTrait • acquire: aCompiledMethod
