Domain-Specific Program Checking

Lukas Renggli, Stéphane Ducasse, Tudor Gîrba, Oscar Nierstrasz

Web Application Framework

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<a href="...">Remove Task 1</a> <br /><a href="...">Remove Task 2</a> <br /><a href="...">Remove Task 3</a> <br />

renderTasksOn: html tasks do: [ :task | html anchor with: 'Remove Task ' , task number; callback: [ tasks remove: task ]. html break ]

renderTasksOn: html tasks do: [ :task | html anchor with: 'Remove Task ' , task number; callback: [ tasks remove: task ]. html break ]

Modifies collection while iterating over it

‣ HTML generation

‣ Javascript generation

‣ Composition definition

‣ Control flow

‣ Application configuration

Internal Domain-Specific Languages

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Generic (Lint)Program Checker

Generic (Lint)Program Checker

ArchitectureChecker

Generic (Lint)Program Checker

Domain-SpecificProgram Checker

ArchitectureChecker

30 Domain-Specific Rules

‣ Possible Bugs

‣ Bad Style

‣ Suboptimal Code

‣ Non-Portable Code

renderTasksOn: html tasks do: [ :task | html anchor with: 'Remove Task ' , task number; callback: [ tasks remove: task ]. html break ]

#with: has to be last message in cascade

renderTasksOn: html tasks do: [ :task | html anchor callback: [ tasks remove: task ]; with: 'Remove Task ' , task number. html break ]

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Slime

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Designed for

Framework Development

Now used for

Application Development

69% developers state

“Slime produces more relevant results than Lint”

81% developers state

“Slime helped me to detect critical bugs”

Generic (Lint)Program Checker

Domain-SpecificProgram Checker

ArchitectureChecker

Magritte Metamodel

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* descriptionmodel

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* descriptionmodel

metamodel

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* descriptionmodel

metamodel

<<described by>>

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* descriptionmodel

metamodel

<<described by>>

meta-metamodel

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* descriptionmodel

metamodel

<<described by>>

meta-metamodel<<described by>>

Person class>>descriptionUsername ^ StringDescription new accessor: #username; beRequired; default: nil; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

Description class>>descriptionLabel ^ StringDescription new accessor: #label; label: ‘Label’; beRequired; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

Generic (Lint)Program Checker

Domain-SpecificProgram Checker

ArchitectureChecker

Generic (Lint)Program Checker

Domain-SpecificProgram Checker

ArchitectureChecker

Domain-SpecificModel Checker

Person class>>descriptionUsername ^ StringDescription new accessor: #username; beRequired; default: nil; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

Person class>>descriptionUsername ^ StringDescription new accessor: #username; label: ‘Username’; beRequired; default: nil; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

Person class>>descriptionUsername ^ StringDescription new accessor: #username; label: ‘Username’; beRequired; default: nil; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

#label is a required value

Invalid default value

Person class>>descriptionUsername ^ StringDescription new accessor: #username; label: ‘Username’; beRequired; default: nil; yourself

Personusernamebirthday

Description

accessorlabelrequiredpriority

*

description

* description

70000 Lines of Code

1100 Classes

300 Described Classes

12000 Methods

70000 Lines of Code

1100 Classes

300 Described Classes

12000 Methods

500 Magritte Issues

Implementation

Extends existing Program-Checker

Parse Tree Matching

scg.unibe.ch/research/helvetia

DeclarativeRule System

Generic (Lint)Program Checker

Domain-SpecificProgram Checker

ArchitectureChecker

Domain-SpecificModel Checker

Domain-SpecificProgram Checking