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M3: an open model for measuring source code artifacts

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Software Analysis And Transformation

M : an Open Model for

Measuring Code Artifacts

Anastasia Izmaylova, Paul Klint, Ashim Shahi, Jurgen Vinju

SWAT

Centrum Wiskunde & Informatica (CWI)

3

(2)

OSSMETER:

FP7 STREP Project: Automated Measurement and Analysis of Open Source Software.

(3)

OSSMETER Objectives

• Objectives

• Get insight in source code quantity & quality

• Get insight into programmer activity

• Means

• Measure source code

• Measure source code

version“deltas”

(4)

SWAT & Rascal

• Software exploration,

transformation, generation, visualization, specification:

software *-ation :-)

• Domain specific languages

• Analyzing software

• Teaching Evolution @ UvA et al.

• Rascal is a DSL

• Lab infra-structure

• “one stop shop”

• Safe & simple

(5)

Domain analysis

Source Code

Models

Descriptions

Generation Extraction

Formalization Visualization

Transformation

Conversion Analysis

Input

Abstraction

Output

Extract

Analyze

S

Ynthesize

EASY

(6)

Research

Tools

Software

Meta Tool one-stop-shop

(7)

OSSMETER: EU FP7 STREP Project on Automated Measurement and Analysis of Open Source Software.

(8)

Challenges

variety of languages & metrics:

reuse, consistency and scale

precision vs. efficiency deep vs. shallow

constraints vs. types vs. CFGs vs. RegEx

(9)

M3

Code M3 Metric

Extract

Measure Analyze

[inspired by FAMIX, SOUL, and others]

(10)

M3

• Language-parametrized meta-model for source code metrics on

syntax and semantics

Code M3 Metric

Extract

Measure Analyze

[inspired by FAMIX, SOUL, and others]

(11)

M3

• Language-parametrized meta-model for source code metrics on

syntax and semantics

• General & simple

Code M3 Metric

Extract

Measure Analyze

[inspired by FAMIX, SOUL, and others]

(12)

M3

• Language-parametrized meta-model for source code metrics on

syntax and semantics

• General & simple

• Formal

Code M3 Metric

Extract

Measure Analyze

[inspired by FAMIX, SOUL, and others]

(13)

M3

• Language-parametrized meta-model for source code metrics on

syntax and semantics

• General & simple

• Formal

• Detailed

Code M3 Metric

Extract

Measure Analyze

[inspired by FAMIX, SOUL, and others]

(14)

M3 = URI + Relations + Trees

(15)

M3 = URI + Relations + Trees

Locations

java+class://java/util/List

(16)

M3 = URI + Relations + Trees

Language agnostic core

containment loc ⨯ loc declarations loc ⨯ loc

use loc ⨯ loc

sorts Exp, Stat,

Locations

java+class://java/util/List

(17)

Language specific extension inheritance loc ⨯ loc

invocation loc ⨯ loc overriding loc ⨯ loc

sig If, Add,While

M3 = URI + Relations + Trees

Language agnostic core

containment loc ⨯ loc declarations loc ⨯ loc

use loc ⨯ loc

sorts Exp, Stat,

Locations

java+class://java/util/List

(18)

Language specific extension inheritance loc ⨯ loc

invocation loc ⨯ loc overriding loc ⨯ loc

sig If, Add,While

M3 = URI + Relations + Trees

Language agnostic core

containment loc ⨯ loc declarations loc ⨯ loc

use loc ⨯ loc

sorts Exp, Stat,

Locations

java+class://java/util/List

Extra cto r

(19)

Language specific extension inheritance loc ⨯ loc

invocation loc ⨯ loc overriding loc ⨯ loc

sig If, Add,While

M3 = URI + Relations + Trees

Language agnostic core

containment loc ⨯ loc declarations loc ⨯ loc

use loc ⨯ loc

sorts Exp, Stat,

Locations

java+class://java/util/List

Extra cto r M etri cs

(20)

Java code

M3 Model

LOC

PHP code C code

CC LCOM

...

…

Managing variety by uniformity

Caveat: details matter!

Uniformity helps reuse but does not guarantee it

(21)

M3 context

(22)

version 1

M3 1

metrics 1

version

2 version 3

metrics 2 metrics 3

...

metrics ...

Representing evolution

M3 2 M3 3 M3 ...

M3 enables comparability and safe composition

measure churn, growth, spikes, degradation, etc.

(23)

version 1

M3 1

delta 1 delta 2 ...

complete M3

Incremental model extraction

M3 delta M3 delta M3 ...

(24)

Key design elements

Textual values

(25)

Key design elements

URI = Qualified Names

and Hyperlinks

(26)

Key design elements

Relations = query and elaborate

reachable = m@containment+

m@invocations += m@invocations o m@overrides

subtypes = m@extends + m@implements

(27)

Key design elements

algebraic data-types are great for ASTs

[pattern matching for open dispatch: term rewriting “inside”]

(28)

Rascal/M3… the point?

• Rascal - CWI SWAT’s lab

• OSSMETER - open source quality platform

• Diversity

• Lots of languages

• Lots of metrics

• Simple, extensible model, immutable/formal

• Caveat emptor & feedback/use welcome

Referenties

Download het nu ( PDF - 28 pagina - 5.05 MB )

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