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About
=====
This is a decision procedure for entailment problems between formulas in
the fragment of Separation Logic with Recursive Definitions (SLRD) 
defined in [FIT-TR-2014-01].


Requires
========
To compile:

- a C99 compiler (tested under gcc)

- GNU flex >= 2.5.33

- GNU bison (tested under bison 2.7.0)

- SMTLIB2 parser of Alberto Griggio available at 
  https://es.fbk.eu/people/griggio/misc/smtlib2parser.html


To execute:
- MINISAT solver available at
  http://minisat.se/
  and compiled with the incremental feature (see README_incremental_minisat.txt)


Installation
============
1) Configuring: 
   - change the SMTLIB2_PREFIX variable in the Makefile.config file
     with the directory where can be found the libsmtlib2parser.so

   - (optional)
     change the compiler name or the compilation flags for the C compiler


2) Compiling:
   - do 'make' in src directory


3) Install:
   - put the 'minisat' tool in the PATH
   - move the 'spen' binary to a known executable path


libVATA
=======

libVATA is provided as a Git submodule fetching a specific revision of the library from Github.

1) Download with

  $ git submodule init
  $ git submodule update

2) Compile with

  $ cd libvata
  $ make release
       - or '$ make debug' for a debug version
       - or '$ MAKE="make -j" make release' (or debug) for faster compilation (on a multicore machine)

3) See the examples in libvata/examples

4) When the libVATA submodule is updated, you need to run again

  $ git submodule update