Overview
========

Spot is a model-checking library developed collaboratively by LRDE
and LIP6. It provides algorithms and data structures to implement
the automata-theoretic approach to LTL model checking.

It is mainly meant to be used as a C++ library, but it also comes with
a few handy command-line utilities, and some (limited) Python
bindings.

Keeping in touch
================

If you have questions regarding Spot, a bug reports, please send them
to <spot@lrde.epita.fr>.  This is a public mailing list which you may
subscribe to at https://www.lrde.epita.fr/mailman/listinfo/spot but you
should feel free to post without subscribing.

We also run an extremely low traffic list for announcements of
new releases of Spot.  You may subscribe to that list at
https://www.lrde.epita.fr/mailman/listinfo/spot-announce


Installation
============

Requirements
------------

Spot requires a complete installation of Python (version 2.0 or
later).  Especially, Python's headers files should be installed.  If
you don't have Python installed, you should run configure with
the --disable-python option (see below).

The Boost libraries should also be installed.


Third-party dependencies
------------------------

Spot also uses a modified version of BuDDy (a binary decision diagram
library), that is already included in the buddy/ directory.  So you
do not need to install it yourself.

Spot used to distribute a modified version of LBTT (an LTL to Büchi
test bench), mostly fixing errors reported by recent compilers.
However Spot now distributes its own reimplementation of LBTT, called
ltlcross, so the use of LBTT is completely optional.  The last
modified version of LBTT we used to distribute can now be found at
  http://spot.lip6.fr/dl/lbtt-1.2.1a.tar.gz
If some lbtt binary is found on your system, it will be used in the
test suite in addition to ltlcross.


Building and installing
-----------------------

Spot follows the traditional `./configure && make && make check &&
make install' process.  People unfamiliar with the GNU Build System
should read the file INSTALL for generic instructions.

In addition to its usual options, ./configure will accept some
flags specific to Spot:

  --with-gspn=DIR
    Turns on GreatSPN support.  DIR should designate the root of
    GreatSPN source tree.  (./configure will then run
    DIR/SOURCES/contrib/version.sh to find the GreatSPN build tree.)

    GreatSPN had to be modified in order to be used as a library
    (thanks Soheib Baarir and Yann Thierry-Mieg for this work), and
    presently these modifications are only available on the GreatSPN
    CVS repository hosted by the Università di Torino.

  --with-included-buddy
    After you have installed Spot the first time, a modified version
    of BuDDy will be installed.  The next time you reconfigure Spot,
    configure will detect that this version is already installed, and
    will attempt to use it directly (this is in case you had to modify
    one of these yourself for another purpose).  This option will
    *force* the use, build, and installation of the included version
    of BuDDy, even when a compatible version is already installed.

  --disable-python
    Turn off the compilation of Python bindings.  These bindings are
    currently used to run a couple of tests, and to build the CGI
    script that translates LTL formulae on-line.  You may safely
    disable these, especially if you do not have a working Python
    installation or if you are attempting some cross-compilation.

  --enable-devel
    Enable debugging symbols, turn off aggressive optimizations, and
    turn on assertions.  This option is effective by default in
    development versions (version numbers ending with a letter).
    It is equivalent to
      --enable-debug
      --enable-warnings
      --enable-assert
      --enable-optimizations=-O
  --disable-devel
    Disable development options.  This is the case by default in
    releases (version numbers NOT ending with a letter).
    It is equivalent to
      --disable-debug
      --disable-warnings
      --disable-assert
      --enable-optimizations

Here are the meaning of the fine-tuning options, in case
--enable/disable-devel is not enough.

  --disable-assert
  --enable-assert
    Control assertion checking.

  --disable-warnings
  --enable-warnings
    Whether warnings should be output.  Note that during development
    we consider warnings to be errors.

  --disable-debug
  --enable-debug
    Whether to compile extra debugging code.

  --enable-optimizations
  --enable-optimizations=FLAGS
  --disable-optimizations
    Whether the compilation should be optimized.  When FLAGS are
    given, use these as optimization flags.  Otherwise, pick working
    flags from a built-in list.


Documentation
=============

Some documentation can be found in the doc/ directory.

- doc/spot.html/ contains documentation for the C++ library.

- doc/tl/tl.pdf contains documentation about the various temporal
  logic operators supported by Spot

"make install" will install man pages for command-line tools.  (These
man pages can also be found in the src/bin/man/ subdirectory of the
source tree.)  Additional documentation about these tools can be
found on-line at http://spot.lip6.fr/userdoc/tools.html



Layout of the source tree
=========================

Core directories
----------------

src/              Sources for libspot.
   bin/           User tools built using the Spot library.
      man/        Man pages for the above tools.
   dstarparse/    Parser for the output of ltl2dstar.
   eltlparse/     Parser for ELTL formulae.
   eltltest/      Tests for ELTL nodes in ltlast/ and eltlparse/.
   kripke/        Kripke Structure interface.
   kripkeparse/   Parser for explicit Kripke.
   kripketest/    Tests for kripke explicit.
   ltlast/        LTL abstract syntax tree (including nodes for ELTL).
   ltlenv/        LTL environments.
   ltlparse/      Parser for LTL formulae.
   ltlvisit/      Visitors of LTL formulae.
   ltltest/       Tests for ltlast/, ltlenv/, ltlparse/, and ltlvisit/.
   misc/          Miscellaneous support files.
   neverparse/    Parser for SPIN never claims.
   priv/          Private algorithms, used internally but not exported.
   tgba/          TGBA objects and cousins.
   tgbaalgos/     Algorithms on TGBA.
      gtec/       Couvreur's Emptiness-Check.
   tgbaparse/     Parser for explicit TGBA.
   ta/            TA objects and cousins (TGTA).
   taalgos/       Algorithms on TA/TGTA.
   tgbatest/      Tests for tgba/, tgbaalgos/, tgbaparse/, ta/ and taalgos/.
   saba/          SABA (State-labeled Alternating Büchi Automata) objects.
   sabaalgos/     Algorithms on SABA.
   sabatest/      Tests for saba/, sabaalgos/.
   sanity/        Sanity tests for the whole project.
doc/              Documentation for libspot.
   org/           Source of userdoc/ as org-mode files.
   tl/            Documentation of the Temporal Logic operators.
   userdoc/       HTML documentation about the command-line tools.
   spot.html/     HTML reference manual for the library.
bench/            Benchmarks for ...
   dtgbasat/      ... SAT-based minimization of DTGBA,
   emptchk/       ... emptiness-check algorithms,
   ltl2tgba/      ... LTL-to-Büchi translation algorithms,
   ltlcounter/    ... translation of a class of LTL formulae,
   ltlclasses/    ... translation of more classes of LTL formulae,
   scc-stats/     ... SCC statistics after translation of LTL formulae,
   split-product/ ... parallelizing gain after splitting LTL automata,
   spin13/        ... compositional suspension and other improvements,
   wdba/          ... WDBA minimization (for obligation properties).
wrap/             Wrappers for other languages.
   python/        Python bindings for Spot and BuDDy
      tests/      Tests for these bindings
      ajax/       LTL-to-TGBA translator with web interface, using Ajax.
iface/            Interfaces to other libraries.
   dve2/          Interface with DiVinE2.
   gspn/          GreatSPN interface.
      examples/   Supporting models used by the test cases.

Third party software
--------------------

buddy/            A patched version of BuDDy 2.3 (a BDD library).
ltdl/             Libtool's portable dlopen() wrapper library.
lib/              Gnulib's portability modules.
utf8/             Nemanja Trifunovic's utf-8 routines.

Build-system stuff
------------------

m4/      M4 macros used by configure.ac.
tools/   Helper scripts used during the build.

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