f414e9f5f2
* spot/misc/game.cc, spot/misc/game.hh: Implement it. * bin/ltlsynt.cc: Use it. * doc/org/ltlsynt.org: Document it.
59 lines
2.2 KiB
Org Mode
59 lines
2.2 KiB
Org Mode
# -*- coding: utf-8 -*-
|
|
#+TITLE: =ltlsynt=
|
|
#+DESCRIPTION: Spot command-line tool for synthesizing AIGER circuits from LTL/PSL formulas.
|
|
#+SETUPFILE: setup.org
|
|
#+HTML_LINK_UP: tools.html
|
|
|
|
* Basic usage
|
|
|
|
This tool answers whether a controller can be built given an LTL/PSL formula
|
|
specifying its behavior. =ltlsynt= is typically called with
|
|
the following three options:
|
|
|
|
- =--input=: a comma-separated list of input signal names
|
|
- =--output=: a comma-separated list of output signal names
|
|
- =--formula= or =--file=: the LTL/PSL specification.
|
|
|
|
The following example is unrealizable, because =a= is an input, so no circuit
|
|
can guarantee that it will be true eventually.
|
|
|
|
#+BEGIN_SRC sh :results verbatim :exports both
|
|
ltlsynt --input=a --output=b -f 'F a'
|
|
#+END_SRC
|
|
|
|
#+RESULTS:
|
|
#+begin_example
|
|
UNREALIZABLE
|
|
#+end_example
|
|
|
|
* TLSF
|
|
|
|
=ltlsynt= was made with the [[http://syntcomp.org/][SYNTCOMP]] competition in
|
|
mind, and more specifically the TLSF track of this competition. TLSF is a
|
|
high-level specification language created for the purpose of this competition.
|
|
Fortunately, the SYNTCOMP organizers also provide a tool called =syfco= which
|
|
can translate a TLSF specification to an LTL formula.
|
|
|
|
The following four steps show you how a TLSF specification called spec.tlsf can
|
|
be tested for realizability using =syfco= and =ltlsynt=:
|
|
|
|
#+BEGIN_SRC sh
|
|
LTL=$(syfco FILE -f ltlxba -m fully)
|
|
IN=$(syfco FILE -f ltlxba -m fully)
|
|
OUT=$(syfco FILE -f ltlxba -m fully)
|
|
ltlsynt --formula="$LTL" --input="$IN" --output="$OUT"
|
|
#+END_SRC
|
|
|
|
* Algorithm
|
|
|
|
The tool reduces the synthesis problem to a parity game, and solves the parity
|
|
game using Zielonka's recursive algorithm. The full reduction from LTL to
|
|
parity game is described in a paper yet to be written and published.
|
|
|
|
You can control the parity game solving step in two ways:
|
|
- By choosing a different algorithm using the =--algo= option. The default is
|
|
=rec= for Zielonka's recursive algorithm, and as of now the only other
|
|
available option is =qp= for Calude et al.'s quasi-polynomial time algorithm.
|
|
- By asking =ltlsynt= not to solve the game and print it instead (in the
|
|
PGSolver format) using the =--print-pg= option, and leaving you the choice of
|
|
an external solver such as PGSolver.
|