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SPIN - PowerPoint PPT Presentation


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SPIN. An explicit state model checker. How does Spin work?. We already saw: The Algorithm The Promela Language We need to see how we does the tool work. High Level Organization. LTL formula. Promela Model. LTL Translator. Buchi Automaton. Buchi Translator. Promela Parser.

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slide1

SPIN

An explicit state model checker

how does spin work
How does Spin work?
  • We already saw:
    • The Algorithm
    • The Promela Language
  • We need to see how we does the tool work.
high level organization
High Level Organization

LTL formula

Promela Model

LTL Translator

Buchi Automaton

Buchi Translator

Promela Parser

The Buchi automaton is

turned into a Promela

process and composed

with the rest of the system.

Abstract Syntax Tree

Automata

Generator

Automata

The generated verifier is

specific to the model and

property we started with.

C Generator

C Code

C Compiler

Pan Verifier

Verification Result

command line tools
Command Line Tools
  • Spin
    • Generates the Promela code for the LTL formula

~$ spin –f “[]<>p”

      • The proposition in the formula must correspond to #defines
    • Generates the C source code

~$ spin –a source.pro

      • The property must be included in the source
  • Pan
    • Performs the verification
      • Has many compile time options to enable different features
      • Optimized for performance
xspin
Xspin
  • GUI for Spin
simulator
Simulator
  • Spin can also be used as a simulator
    • Simulated the Promela program
  • It is used as a simulator when a counterexample is generated
    • Steps through the trace
    • The trace itself is not “readable”
  • Can be used for random and manually guided simulation as well
comments
Comments
  • DFS does not necessarily find the shortest counterexample
  • There might be a very short counterexample but the verification might go out of memory
  • If we don’t finish we might still have some sort of a result (coverage metrics)