- Spot-announce

Spot 1.99.3 has been released
by Alexandre Duret-Lutz 26 Aug '15

26 Aug '15

We are pleased to announce the release of Spot 1.99.3. This maintenance release fixes several bugs, and finally merges some of the important code that was duplicated between the handling of automata in ltl2dstar's format, and automata in the HOA format. http://www.lrde.epita.fr/dload/spot/spot-1.99.3.tar.gz See https://spot.lrde.epita.fr/ for documentation and installation instructions. Please direct any feedback to <spot(a)lrde.epita.fr>. New in spot 1.99.3 (2015-08-26) * The CGI script for LTL translation offers a HOA download link for each generated automaton. * The html documentation now includes a HTML copies of the man pages, and HTML copies of the Python notebooks. * scc_filter(aut, true) does not remove Fin marks from rejecting SCCs, but it now does remove Fin marks from transitions between SCCs. * All the unabbreviation functions (unabbreviate_ltl(), unabbreviate_logic(), unabbreviate_wm()) have been merged into a single unabbreviate() function that takes a string representing the list of operators to remove among "eFGiMRW^" where 'e', 'i', and '^' stand respectively for <->, ->, and xor. This feature is also available via ltlfilt --unabbreviate. * In LTL formulas, atomic propositions specified using double-quotes can now include \" and \\. (This is more consistent with the HOA format, which already allows that.) * All the conversion routines that were written specifically for ltl2dstar's output format (DRA->BA & DRA->TGBA) have been ported to the new TωA structure supporting the HOA format. The DRA->TGBA conversion was reimplemented in the previous release, and the DRA->BA conversion has been reimplemented in this release (but it is still restricted to state-based acceptance). All these conversions are called automatically by to_generalized_buchi() or remove_fin() so there should be no need to call them directly. As a consequence: - "autfilt --remove-fin" or "autfilt -B" is better at converting state-based Rabin automata: it will produce a DBA if the input is deterministic and DBA-realizable, but will preserve as much determinism as possible otherwise. - a lot of obsolete code that was here only to support the old conversion routines has been removed. (The number of lines removed by this release is twice the number of lines added.) - ltlcross now uses automata in ltl2dstar's format directly, without converting them to Büchi (this makes the statistics reported in CSV files more relevant). - ltlcross no longer outputs additional columns about the size of the input automaton in the case ltl2dstar's format is used. - ltldo uses results in ltl2dstar's format directly, without converting them to Büchi. - dstar2tgba has been greatly simplified and now uses the same output routines as all the other tools that output automata. This implies a few minor semantic changes, for instance --stats=%A used to output the number of acceptance *pairs* in the input automaton, while it now outputs the number of acceptance sets like in all the other tools. * Bugs fixed - Some acceptance conditions like Fin(0)|Fin(1)|Fin(2)&Inf(3) were not detected as generalized-Rabin. - Unknown arguments for print_hoa() (i.e., option -H in command-line tools) are now diagnosed. - The CGI script for LTL translation now forces transition-based acceptance on WDBA-minimized automata when TGBA is requested. - ltlgrind --help output had some options documented twice, or in the wrong place. - The man page for ltlcross had obsolete examples. - When outputting atomic propositions in double quotes, the escaping routine used by the two styles of LaTeX output was slightly wrong. For instance ^ was incorrectly escaped, and the double quotes where not always properly rendered. - A spurious assertion was triggered by streett_to_generalized_buchi(), but only when compiled in DEBUG mode. - LTL formula rewritten in Spin's syntax no longer have their -> and <-> rewritten away. - Fix some warnings reported by the development version of GCC 6. - The spot.translate() function of the Python binding had a typo preventing the use of 'low'/'medium'/'high' as argument. - Fix spurious failure of uniq.test under different locales. - ltlcross now recovers from out-of-memory errors during state-space products. - bitvect.test was failing on 32bit architectures with assertions enabled because of a bug in the test case. -- Alexandre Duret-Lutz

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Spot 1.99.2 has been released.
by Alexandre Duret-Lutz 18 Jul '15

18 Jul '15

We are happy to announce the release of Spot 1.99.2. This maintenance release fixes some bugs that have been reported (or not) against 1.99.1, and speeds up a couple of things. You can download the new release from http://www.lrde.epita.fr/dload/spot/spot-1.99.2.tar.gz See https://spot.lrde.epita.fr/ for documentation and installation instructions. Please report any problem and questions to spot(a)lrde.epita.fr New in spot 1.99.2 (2015-07-18) * The scc_info object, used to build a map of SCCs while gathering additional information, has been simplified and speed up. One test case where ltlcross would take more than 13min (to check the translation of one PSL formula) now takes only 75s. * streett_to_generalized_buchi() is a new function that implements what its name suggests, with some SCC-based optimizations over the naive definition. It is used by the to_generalized_buchi() and remove_fin() functions when the input automaton is a Streett automaton with more than 3 pairs (this threeshold can be changed via the SPOT_STREETT_CONV_MIN environment variable -- see the spot-x(7) man page for details). This is mainly useful to ltlcross, which has to get rid of "Fin" acceptance to perform its checks. As an example, the Streett automaton generatated by ltl2dstar (configured with ltl2tgba) for the formula !((GFa -> GFb) & (GFc -> GFd)) has 4307 states and 14 acceptance sets. The new algorithm can translate it into a TGBA with 9754 states and 7 acceptance sets, while the default approch used for converting any acceptance to TGBA would produce 250967 states and 7 acceptance sets. * Bugs fixed: - p[+][:*2] was not detected as belonging to siPSL. - scc_filter() would incorrectly remove Fin marks from rejecting SCCs. - the libspotltsmin library is installed. - ltlcross and ltldo did not properly quote atomic propositions and temporary file names containing a single-quote. - a missing Python.h is now diagnosed at ./configure time, with the suggestion to either install python3-devel, or run ./configure --disable-python. - Debian packages for libraries have been split from the main Spot package, as per Debian guidelines. -- Alexandre Duret-Lutz

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Spot 1.99.1 released
by Alexandre Duret-Lutz 23 Jun '15

23 Jun '15

Spot is a C++11 library for ω-automata manipulation and model checking. This release contains 713 patches contribued over the last 18 months by Thibaud Michaud, Étienne Renault, Alexandre Lewkowicz, and myself. As the name suggests, this release reflects a huge progress towards Spot 2.0, but we are not quite there yet: the only thing you should not consider as stable in this release is the C++ API, as it should change a lot as we march towards version 2.0. This release also comes with a new web site at https://spot.lrde.epita.fr/ and Debian packages. See https://spot.lrde.epita.fr/install.html for installation instructions, or grab the source tarball directly at https://www.lrde.epita.fr/dload/spot/spot-1.99.1.tar.gz New in spot 1.99.1 (2015-06-23) * Major changes motivating the jump in version number - Spot now works with automata that can represent more than generalized Büchi acceptance. Older versions were built around the concept of TGBA (Transition-based Generalized Büchi Automata) while this version now deals with what we call TωA (Transition-based ω-Automata). TωA support arbitrary acceptance conditions specified as a Boolean formula of transition sets that must be visited infinitely often or finitely often. This genericity allows for instance to represent Rabin or Streett automata, as well as some generalized variants of those. - Spot has near complete support for the Hanoi Omega Automata format. http://adl.github.io/hoaf/ This formats supports automata with the generic acceptance condition described above, and has been implemented in a number of third-party tools (see http://adl.github.io/hoaf/support.html) to ease their interactions. The only part of the format not yet implemented in Spot is the support for alternating automata. - Spot is now compiling in C++11 mode. The set of C++11 features we use requires GCC >= 4.8 or Clang >= 3.5. Although GCC 4.8 is more than 2-year old, people with older installations won't be able to install this version of Spot. - As a consequence of the switches to C++11 and to TωA, a lot of the existing C++ interfaces have been renamed, and sometime reworked. This makes this version of Spot not backward compatible with Spot 1.2.x. See below for the most important API changes. Furtheremore, the reason this release is not called Spot 2.0 is that we have more of those changes planned. - Support for Python 2 was dropped. We now support only Python 3.2 or later. The Python bindings have been improved a lot, and include some convenience functions for better integration with IPython's rich display system. User familiar with IPython's notebook should have a look at the notebook files in wrap/python/tests/*.ipynb * Major news for the command-line tools - The set of tools installed by spot now consists in the following 11 commands. Those marked with a '+' are new in this release. - randltl Generate random LTL/PSL formulas. - ltlfilt Filter and convert LTL/PSL formulas. - genltl Generate LTL formulas from scalable patterns. - ltl2tgba Translate LTL/PSL formulas into Büchi automata. - ltl2tgta Translate LTL/PSL formulas into Testing automata. - ltlcross Cross-compare LTL/PSL-to-Büchi translators. + ltlgrind Mutate LTL/PSL formula. - dstar2tgba Convert deterministic Rabin or Streett automata into Büchi. + randaut Generate random automata. + autfilt Filter and convert automata. + ltldo Run LTL/PSL formulas through other tools. randaut does not need any presentation: it does what you expect. ltlgrind is a new tool that mutates LTL or PSL formulas. If you have a tool that is bogus on some formula that is too large to debug, you can use ltlgrind to generate smaller derived formulas and see if you can reproduce the bug on those. autfilt is a new tool that processes a stream of automata. It allows format conversion, filtering automata based on some properties, and general transformations (e.g., change of acceptance conditions, removal of useless states, product between automata, etc.). ltldo is a new tool that runs LTL/PSL formulas through other tools, but uses Spot's command-line interfaces for specifying input and output. This makes it easier to use third-party tool in a pipe, and it also takes care of some necessary format conversion. - ltl2tgba has a new option, -U, to produce unambiguous automata. In unambiguous automata any word is recognized by at most one accepting run, but there might be several ways to reject a word. This works for LTL and PSL formulas. - ltl2tgba has a new option, -S, to produce generalized-Büchi automata with state-based acceptance. Those are obtained by converting some transition-based GBA into a state-based GBA, so they are usually not as small as one would wish. The same option -S is also supported by autfilt. - ltlcross will work with translator producing automata with any acceptance condition, provided the output is in the HOA format. So it can effectively be used to validate tools producing Rabin or Streett automata. - ltlcross has several new options: --grind attempts to reduce the size of any bogus formula it discovers, while still exhibiting the bug. --ignore-execution-failures ignores cases where a translator exits with a non-zero status. --automata save the produced automata into the CSV or JSON file. Those automata are saved using the HOA format. ltlcross will also output two extra columns in its CSV/JSON output: "ambiguous_aut" and "complete_aut" are Boolean that respectively tells whether the automaton is ambiguous and complete. - "ltlfilt --stutter-invariant" will now work with PSL formulas. The implementation is actually much more efficient than our previous implementation that was only for LTL. - ltlfilt's old -q/--quiet option has been renamed to --ignore-errors. The new -q/--quiet semantic is the same as in grep (and also autfilt): disable all normal input, for situtations where only the exit status matters. - ltlfilt's old -n/--negate option can only be used as --negate now. The short '-n NUM' option is now the same as the new --max-count=N option, for consistency with other tools. - ltlfilt has a new --count option to count the number of matching automata. - ltlfilt has a new --exclusive-ap option to constrain formulas based on a list of mutually exclusive atomic propositions. - ltlfilt has a new option --define to be used in conjunction with --relabel or --relabel-bool to print the mapping between old and new labels. - all tools that produce formulas or automata now have an --output (a.k.a. -o) option to redirect that output to a file instead of standard output. The name of this file can be constructed using the same %-escape sequences that are available for --stats or --format. - all tools that output formulas have a -0 option to separate formulas with \0. This helps in conjunction with xargs -0. - all tools that output automata have a --check option that request extra checks to be performed on the output to fill in properties values for the HOA format. This options implies -H for HOA output. For instance ltl2tgba -H 'formula' will declare the output automaton as 'stutter-invariant' only if the formula is syntactically stutter-invariant (e.g., in LTL\X). With ltl2tgba --check 'formula' additional checks will be performed, and the automaton will be accurately marked as either 'stutter-invariant' or 'stutter-sensitive'. Another check performed by --check is testing whether the automaton is unambiguous. - ltlcross (and ltldo) have a list of hard-coded shorthands for some existing tools. So for instance running 'ltlcross spin ...' is the same as running 'ltlcross "spin -f %s>%N" ...'. This feature is much more useful for ltldo. - For options that take an output filename (i.e., ltlcross's --save-bogus, --grind, --csv, --json) you can force the file to be opened in append mode (instead of being truncated) by by prefixing the filename with ">>". For instance --save-bogus=">>bugs.ltl" will append to the end of the file. * Other noteworthy news - The web site moved to http://spot.lrde.epita.fr/. - We now have Debian packages. See http://spot.lrde.epita.fr/install.html - The documentation now includes some simple code examples for both Python and C++. (This is still a work in progress.) - The curstomized version of BuDDy (libbdd) used by Spot has be renamed as (libbddx) to avoid issues with copies of BuDDy already installed on the system. - There is a parser for the HOA format (http://adl.github.io/hoaf/) available as a spot::automaton_stream_parser object or spot::parse_aut() function. The former version is able to parse a stream of automata in order to do batch processing. This format can be output by all tools (since Spot 1.2.5) using the --hoa option, and it can be read by autfilt (by default) and ltlcross (using the %H specifier). The current implementation does not support alternation. Multiple initial states are converted into an extra initial state; complemented acceptance sets Inf(!x) are converted to Inf(x); explicit or implicit labels can be used; aliases are supported; "--ABORT--" can be used in a stream. - The above HOA parser can also parse never claims, and LBTT automata, so the never claim parser and the LBTT parser have been removed. This implies that autfilt can input a mix of HOA, never claims, and LBTT automata. ltlcross also use the same parser for all these output, and the old %T and %N specifiers have been deprecated and replaced by %O (for output). - While not all algorithms in the library are able to work with any acceptance condition supported by the HOA format, the following two new functions mitigate that: - remove_fin() takes a TωA whose accepting condition uses Fin(x) primitive, and produces an equivalent TωA without Fin(x): i.e., the output acceptance is a disjunction of generalized Büchi acceptance. This type of acceptance is supported by SCC-based emptiness-check, for instance. - similarly, to_tgba() converts any TωA into an automaton with generalized-Büchi acceptance. - randomize() is a new algorithm that randomly reorders the states and transitions of an automaton. It can be used from the command-line using "autfilt --randomize". - the interface in iface/dve2 has been renamed to iface/ltsmin because it can now interface the dynamic libraries created either by Divine (as patched by the LTSmin group) or by Spins (the LTSmin compiler for Promela). - LTL/PSL formulas can include /* comments */. - PSL SEREs support a new operator [:*i..j], the iterated fusion. [:*i..j] is to the fusion operator ':' what [*i..j] is to the concatenation operator ';'. For instance (a*;b)[:*3] is the same as (a*;b):(a*;b):(a*;b). The operator [:+], is syntactic sugar for [:*1..], and corresponds to the operator ⊕ introduced by Dax et al. (ATVA'09). - GraphViz output now uses an horizontal layout by default, and also use circular states (unless the automaton has more than 100 states, or uses named-states). The --dot option of the various command-line tools takes an optional parameter to fine-tune the GraphViz output (including vertical layout, forced circular or elliptic states, named automata, SCC information, ordered transitions, and different ways to colorize the acceptance sets). The environment variables SPOT_DOTDEFAULT and SPOT_DOTEXTRA can also be used to respectively provide a default argument to --dot, and add extra attributes to the output graph. - Never claims can now be output in the style used by Spin since version 6.2.4 (i.e., using do..od instead of if..fi, and with atomic statements for terminal acceptance). The default output is still the old one for compatibility with existing tools. The new style can be requested from command-line tools using option --spin=6 (or -s6 for short). - Support for building unambiguous automata. ltl_to_tgba() has a new options to produce unambiguous TGBA (used by ltl2tgba -U as discussed above). The function is_unambiguous() will check whether an automaton is unambigous, and this is used by autfilt --is-unmabiguous. - The SAT-based minimization algorithm for deterministic automata has been updated to work with ω-Automaton with any acceptance. The input and the output acceptance can be different, so for instance it is possible to create a minimal deterministic Streett automaton starting from a deterministic Rabin automaton. This functionnality is available via autfilt's --sat-minimize option. See doc/userdoc/satmin.html for details. - The on-line interface at http://spot.lrde.epita.fr/trans.html can be used to check stutter-invariance of any LTL/PSL formula. - The on-line interface will work around atomic propositions not supported by ltl3ba. (E.g. you can now translate F(A) or G("foo < bar").) * Noteworthy code changes - Boost is not used anymore. - Automata are now manipulated exclusively via shared pointers. - Most of what was called tgba_something is now called twa_something, unless it is really meant to work only for TGBA. This includes functions, classes, file, and directory names. For instance the class tgba originally defined in tgba/tgba.hh, has been replaced by the class twa defined in twa/twa.hh. - the tgba_explicit class has been completely replaced by a more efficient twa_graph class. Many of the algorithms that were written against the abstract tgba (now twa) interface have been rewritten using twa_graph instances as input and output, making the code a lot simpler. - The tgba_succ_iterator (now twa_succ_iterator) interface has changed. Methods next(), and first() should now return a bool indicating whether the current iteration is valid. - The twa base class has a new method, release_iter(), that can be called to give a used iterator back to its automaton. This iterator is then stored in a protected member, iter_cache_, and all implementations of succ_iter() can be updated to recycle iter_cache_ (if available) instead of allocating a new iterator. - The tgba (now called twa) base class has a new method, succ(), to support C++11' range-based for loop, and hide all the above change. Instead of the following syntax: tgba_succ_iterator* i = aut->succ_iter(s); for (i->first(); !i->done(); i->next()) { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } delete i; We now prefer: for (auto i: aut->succ(s)) { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } And the above syntax is really just syntactic suggar for twa_succ_iterator* i = aut->succ_iter(s); if (i->first()) do { // use i->current_state() // i->current_condition() // i->current_acceptance_conditions() } while (i->next()); aut->release_iter(i); // allow the automaton to recycle the iterator Where the virtual calls to done() and delete have been avoided. - twa::succ_iter() now takes only one argument. The optional global_state and global_automaton arguments have been removed. - The following methods have been removed from the TGBA interface and all their subclasses: - tgba::support_variables() - tgba::compute_support_variables() - tgba::all_acceptance_conditions() // use acc().accepting(...) - tgba::neg_acceptance_conditions() - tgba::number_of_acceptance_conditions() // use acc().num_sets() - Membership to acceptance sets are now stored using bit sets, currently limited to 32 bits. Each TωA has a acc() method that returns a reference to an acceptance object (of type spot::acc_cond), able to operate on acceptance marks (spot::acc_cond::mark_t). Instead of writing code like i->current_acceptance_conditions() == aut->all_acceptance_conditions() we now write aut->acc().accepting(i->current_acceptance_conditions()) (Note that for accepting(x) to return something meaningful, x should be a set of acceptance sets visitied infinitely often. So let's imagine that in the above example i is looking at a self-loop.) Similarly, aut->number_of_acceptance_conditions() is now aut->acc().num_sets() - All functions used for printing LTL/PSL formulas or automata have been renamed to print_something(). Likewise the various parsers should be called parse_something() (they haven't yet all been renamed). - All test suites under src/ have been merged into a single one in src/tests/. The testing tool that was called src/tgbatest/ltl2tgba has been renamed as src/tests/ikwiad (short for "I Know What I Am Doing") so that users should be less tempted to use it instead of src/bin/ltl2tgba. * Removed features - The long unused interface to GreatSPN (or rather, interface to a non-public, customized version of GreatSPN) has been removed. As a consequence, we could get rid of many cruft in the implementation of Couvreur's FM'99 emptiness check. - Support for symbolic, BDD-encoded TGBAs has been removed. This includes the tgba_bdd_concrete class and associated supporting classes, as well as the ltl_to_tgba_lacim() LTL translation algorithm. Historically, this TGBA implementation and LTL translation were the first to be implemented in Spot (by mistake!) and this resulted in many bad design decisions. In practice they were of no use as we only work with explicit automata (i.e. not symbolic) in Spot, and those produced by these techniques are simply too big. - All support for ELTL, i.e., LTL logic extended with operators represented by automata has been removed. It was never used in practice because it had no practical user interface, and the translation was a purely-based BDD encoding producing huge automata (when viewed explictely), using the above and non longuer supported tgba_bdd_concrete class. - Our implementation of the Kupferman-Vardi complementation has been removed: it was unused in practice beause of the size of the automata built, and it did not survive the conversion of acceptance sets from BDDs to bitsets. - The unused implementation of state-based alternating Büchi automata has been removed. - Input and output in the old, Spot-specific, text format for TGBA, has been fully removed. We now use HOA everywhere. (In case you have a file in this format, install Spot 1.2.6 and use "src/tgbatest/ltl2tgba -H -X file" to convert the file to HOA.) -- Alexandre Duret-Lutz

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Spot 1.2.6 has been released.
by Alexandre Duret-Lutz 06 Dec '14

06 Dec '14

Never say "never": here is yet another bug fix release for Spot 1.2. The most important fix is for a simplification rule for some unlikely PSL pattern. Then we have some improved compatibilities with some newer versions of the tools we use in the build, some fixes to the HOA format (as output by ltl2tgba --hoaf) that the current development version of Spot 2.0 is able to read, and some improved errors checks for ltlcross. You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.6.tar.gz New in spot 1.2.6 (2014-12-06) * New features: - ltlcross --verbose is a new option to see what is being done * Bug fixes: - Remove one incorrect simplification rule for PSL discovered via checks on random formulaes. (The bug was very unlikely to trigger on non-random formulas, because it requires a SERE with an entire subexpression that is unsatisfiable.) - When the automaton resulting from the translation of a positive formula is deterministic, ltlcross will compute its complement to perform additional checks against other translations of the positive formula. The same procedure should be performed with automata obtained from negated formulas, but because of a typo this was not the case. - the neverclaim parser will now diagnose redefinitions of state labels. - the acceptance specification in the HOA format output have been adjusted to match recent changes in the format specifications. - atomic propositions are correctly escaped in the HOA output. - the build rules for documentation have been made compatible with version 8.0 of Org-mode. (This was only a problem if you build from the git repository, or if you want to edit the documentation.) - recent to changes to libstd++ (as shipped by g++ 4.9.2) have demonstrated that the order of transitions output by the LTL->TGBA translation used to be dependent on the implementation of the STL. This is now fixed. - some developpement version of libstd++ had a bug (PR 63698) in the assignment of std::set, and that was triggered in two places in Spot. The workaround (not assigning sets) is actually more efficient, so we can consider it as a bug fix, even though libstd++ has also been fixed. - all parsers would report wrong line numbers while processing files with DOS style newlines. - add support for SWIG 3.0. -- Alexandre Duret-Lutz

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Spot 1.2.5 has been released.
by Alexandre Duret-Lutz 21 Aug '14

21 Aug '14

This maintenance release fixes a couple of translation bugs, and adds several small utility features to the command-line and online tools. Special thanks to Joachim Klein for some useful suggestions. Unless some serious bugs are reported, this is likely to be the last release of Spot 1.2. The current development version of Spot, which will probably released as Spot 2.0 next year, is so much ahead of this code base that maintaining this version is starting to be a burden. By the way, I should probably issue a friendly warning to those using Spot as a C++ library: the changes in version 2.0 will be big enough so that there is no way to maintain compatibility with code written for the current version. It will require changes to existing code, the first of which being to switch to C++11. (Spot 1.2.5 should compile fine with C++11, so you can already make that switch.) You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.5.tar.gz New in spot 1.2.5 (2014-08-21) * New features: - The online ltl2tgba translator will automatically attempt to parse a formula using LBT's syntax if it cannot parse it using the normal infix syntax. It also has an option to display formulas using LBT's syntax. - ltl2tgba and dstar2tgba have a new experimental option --hoaf to output automata in the Hanoï Omega Automaton Format whose current draft is at http://adl.github.io/hoaf/ The corresponding C++ function is spot::hoaf_reachable() in tgbaalgos/hoaf.hh. - 'randltl 4' is now a shorthand for 'randltl p0 p1 p2 p3'. - ltlcross has a new option --save-bogus=FILENAME to save any formula for which a problem (other than timeout) was detected during translation or using the resulting automatas. * Documentation: - The man page for ltl2tgba has some new notes and references about TGBA and about monitors. * Bug fixes: - Fix incorrect simplification of promises in the translation of the M operator (you may suffer from the bug even if you do not use this operator as some LTL patterns are automatically reduced to it). - Fix simplification of bounded repetition in SERE formulas. - Fix incorrect translation of PSL formulas of the form !{f} where f is unsatisifable. A similar bug was fixed for {f} in Spot 1.1.4, but for some reason it was not fixed for !{f}. - Fix parsing of neverclaims produced by Modella. - Fix a memory leak in the little-used conversion from transition-based alternating automata to tgba. - Fix a harmless uninitialized read in BuDDy. - When writing to the terminal, ltlcross used to display each formula in bright white, to make them stand out. It turns out this was actually hiding the formulas for people using a terminal with white background... This version displays formula in bright blue instead. - 'randltl -n -1 --seed 0' and 'randltl -n -1 --seed 1' used to generate nearly the same list of formulas, shifted by one, because the PRNG write reset with an incremented seed between each output formula. The PRNG is now reset only once. -- Alexandre Duret-Lutz

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Spot 1.2.4 released
by Alexandre Duret-Lutz 15 May '14

15 May '14

Spot 1.2.4 has been released. This maintenance release fixes a crashing scenario in the translation of testing automata, a couple of incorrect PSL simplifications, and a bug in the translation of the fusion operator. You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.4.tar.gz New in spot 1.2.4 (2014-05-15) * New features: - "-B -x degen-lskip" can be used to disable level-skipping in the degeralization procedure called by ltl2tgba and dstar2tgba. This is mostly meant for running experiments. - "-B -x degen-lcache=N" can be used to experiment with different type of level caching during degeneralization. * Bug fixes: - Change the Python bindings to make them compatible with Swig 3.0. - "ltl2tgta --ta" could crash in certain conditions due to the introduction of a simulation-based reduction after degeneralization. - Fix four incorrect formula-simplification rules, three were related to the factorization of Boolean subformulas in operands of the non-length-matching "&" SERE operator, and a fourth one could only be enabled by explicitely passing the favor_event_univ option to the simplifier (not the default). - Fix incorrect translation of the fusion operator (":") in SERE such as {xx;1}:yy[*] where the left operand has 1 as tail. -- Alexandre Duret-Lutz

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Spot 1.2.3 released
by Alexandre Duret-Lutz 11 Feb '14

11 Feb '14

We are happy to announce that Spot 1.2.3 has been released. This maintenance release addresses more portability issues and other minor bugs listed below. It also supports a new SPOT_SATLOG environment variable to extra more statistics from our SAT-based minimization procedures. It contains contributions from Alexandre Lewkowicz and Étienne Renault. You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.3.tar.gz New in spot 1.2.3 (2014-02-11) * New features: - The SPOT_SATLOG environment variable can be set to a filename to obtain statistics about the different iterations of the SAT-based minimization. For an example, see http://spot.lip6.fr/userdoc/satmin.html - The bench/dtgbasat/ benchmark has been updated to use SPOT_SATLOG and record more statistics. - The default value for the SPOT_SATSOLVER environment variable has been changed to "glucose -verb=0 -model %I >%O". This assumes that glucose 3.0 is installed. For older versions of glucose, remove the "-model" option. * Bug fixes: - More fixes for Python 3 compatibility. - Fix calculation of length_boolone(), were 'Xa|b|c' was considered as length 6 instead of 4 (because it is 'Xa|(b|a)' were (b|a) is Boolean). - Fix Clang-3.5 warnings. - randltl -S did not honor --boolean-priorities. - randltl had trouble generating formulas when all unary, or all binary/n-ary operators were disabled. - Fix spurious testsuite failure when using Pandas 0.13. - Add the time spent in child processes when measuring time with the timer class. - Fix determinism of the SAT-based minimization encoding. (It would sometimes produce different equivalent automata, because of a different encoding order.) - A the SAT-based minimization is asked for a 10-state automaton and return a 6-state automaton, do not ask for a 9-state automaton in the next iteration... - Fix some compilation issue with the version of Apple's Clang that is installed with MacOS X 10.9. - Fix VPATH builds when building from the git repository. - Fix UP links in the html documentation for command-line tools. -- Alexandre Duret-Lutz

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Spot 1.2.2 has been released
by Alexandre Duret-Lutz 24 Jan '14

24 Jan '14

I'm happy to announce that Spot 1.2.2 has been released. This maintenance release addresses a couple of portability issues and other minor bugs discovered over the last month. You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.2.tar.gz New in spot 1.2.2 (2014-01-24) * Bug fixes: - Fix compilation *and* behavior of bitvectors on 32-bit architectures. - Fix some compilation errors observed using the antique G++ 4.0.1. - Fix compatibility with Python 3 in the test suite. - Fix a couple of new clang warnings (like "unused private member"). - Add some missing #includes that are not included indirectly when the C++ compiler is in C++11 mode. - Fix detection of numbers that are too large in the ELTL parser. - Fix a memory leak in the ELTL parser, and avoid some unnecessary calls to strlen() at the same time. -- Alexandre Duret-Lutz

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Spot 1.2.1 released (a release focused on CSV output and input)
by Alexandre Duret-Lutz 11 Dec '13

11 Dec '13

I'm happy to announce that Spot 1.2.1 has been released. These release improves the CSV reporting of ltlcross (including size for Rabin or Streett automata, separate measurements in case multiple products are used, and information about the exit status of the translators). As a consequence the order of columns has changed slightly, and it will break scripts that use hardcoded column positions. If you want to get a CSV output that is closest to what ltlcross used to output before, use the --omit-missing option (but even with that the "time" column has been shifted left). Other tools have also learned how to read CSV files, and have some options to help creating CSV files. You can download the new release here: http://spot.lip6.fr/dl/spot-1.2.1.tar.gz New in spot 1.2.1 (2013-12-11) * New features: - commands for translators specified to ltlcross can now be given "short names" to be used in the CSV or JSON output. For instance ltlcross '{small} ltl2tgba -s --small %f >%N' ... will run the command "ltl2tgba -s --small %f >%N", but only print "small" in output files. - ltlcross' CSV and JSON output now contains two additional columns: exit_status and exit_code, used to report failures of the translator. If the translation failed, only the time is reported, and the rest of the statistics, which are missing, area left empty (in CVS) or null (in JSON). A new option, --omit-missing can be used to remove lines for failed translations, and remove these two columns. - if ltlcross is used with --products=+5 instead of --products=5 then the stastics for each of the five products will be output separately instead of being averaged. - if ltlcross is used with tools that produce deterministic Streett or Rabin automata (as specified with %D), then the statistics output in CSV or JSON will have some extra columns to report the size of these input automata before ltlcross converts them into TGBA to perform its regular checks. - ltlfilt, ltl2tgba, ltl2tgta, and ltlcross can now read formulas from CSV files. Use option -F FILE/COL to read formulas from column COL of FILE. Use -F FILE/-COL if the first line of FILE be ignored. - when ltlfilt processes formulas from a CSV file, it will output each CSV line whose formula matches the given constraints, with the rewriten formula. The new escape sequence %< (text in columns before the formula) and %> (text after) can be used with the --format option to alter this output. - ltlfile, genltl, randltl, and ltl2tgba have a --csv-escape option to help escape formulas in CSV files. - Please check http://spot.lip6.fr/userdoc/csv.html for some discussion and examples of the last few features. * Bug fixes: - ltlcross' CSV output has been changed to be more RFC 4180 compliant: it no longuer output useless cosmetic spaces, and use double-quotes with proper escaping for strings. The only RFC 4180 rule that it does not follow is that it will terminate lines with \n instead of \r\n because the latter cause issues with a couple of tools. - ltlcross failed to report missing input or output escape sequences on all but the first configured translator. -- Alexandre Duret-Lutz

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Spot 1.2 released
by Alexandre Duret-Lutz 01 Oct '13

01 Oct '13

I'm very pleased to announce the release of Spot 1.2. 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. This release contains several new features (summarized below), but the most notable are the interface with ltl2dstar (i.e., Spot can read deterministic Rabin and Streett automata and convert them into Büchi automata) and algorithms for minimizing deterministic TGBA or BA using a SAT-solver. You can find the new version here: http://spot.lip6.fr/dl/spot-1.2.tar.gz Please report any issue to <spot(a)lrde.epita.fr>. New in spot 1.2 (2013-10-01) * Changes to command-line tools: - ltlcross has a new option --color to color its output. It is enabled by default when the output is a terminal. - ltlcross will give an example of infinite word accepted by the two automata when the product between a positive automaton and a negative automaton is non-empty. - ltlcross can now read the Rabin and Streett automata output by ltl2dstar. This type of output should be specified using '%D': ltlcross 'ltl2dstar --ltl2nba=spin:path/to/ltl2tgba@-s %L %D' However because Spot only supports Büchi acceptance, these Rabin and Streett automata are immediately converted to TGBAs before further processing by ltlcross. This is still interesting to search for bugs in translators to Rabin or Streett automata, but the statistics (of the resulting TGBAs) might not be very relevant. - When ltlcross obtains a deterministic automaton from a translator it will now complement this automaton to perform additional intersection checks. This is complementation is done only for deterministic automata (because that is cheap) and can be disabled with --no-complement. - To help with debugging problems detected by ltlcross, the environment variables SPOT_TMPDIR and SPOT_TMPKEEP control where temporary files are created and if they should be erased. Read the man page of ltlcross for details. - There is a new command, named dstar2tgba, that converts a deterministic Rabin or Streett automaton (expressed in the output format of ltl2dstar) into a TGBA, BA or Monitor. In the case of Rabin acceptance, the conversion will output a deterministic Büchi automaton if one such automaton exist. Even if no such automaton exists, the conversion will actually preserves the determinism of any SCC that can be kept deterministic. In the case of Streett acceptance, the conversion produces non-deterministic Büchi automata with Generalized acceptance. These are then degeneralized if requested. See http://spot.lip6.fr/userdoc/dstar2tgba.html for some examples, and the man page for more reference. - The %S escape sequence used by ltl2tgba --stats to display the number of SCCs in the output automaton has been renamed to %c. This makes it more homogeneous with the --stats option of the new dstar2tgba command. Additionally, the %p escape can now be used to show whether the output automaton is complete, and the %r escape will give the number of seconds spent building the output automaton (excluding the time spent parsing the input). - ltl2tgba, ltl2tgta, and dstar2tgba have a --complete option to output complete automata. - ltl2tgba, ltl2tgta, and dstar2tgba can use a SAT-solver to minimize deterministic automata. Doing so is only needed on properties that are stronger than obligations (for obligations our WDBA-minimization procedure will return a minimimal deterministic automaton more efficiently) and is disabled by default. See the spot-x(7) man page for documentation about the related options: sat-minimize, sat-states, sat-acc, state-based. See also http://spot.lip6.fr/userdoc/satmin.html for some examples. - ltlfilt, genltl, and randltl now have a --latex option to output formulas in a way that its easier to embed in a LaTeX document. Each operator is output as a command such as \U, \F, etc. doc/tl/spotltl.sty gives one possible definition for each macro. - ltlfilt, genltl, and randltl have a new --format option to indicate how to present the output formula, possibly with information about the input. - ltlfilt as a new option, --relabel-bool, to abstract independent Boolean subformulae as if they were atomic propositions. For instance "a & GF(c | d) & b & X(c | d)" would be rewritten as "p0 & GF(p1) & Xp1". * New functions and classes in the library: - dtba_sat_synthetize(): Use a SAT-solver to build an equivalent deterministic TBA with a fixed number of states. - dtba_sat_minimize(), dtba_sat_minimize_dichotomy(): Iterate dtba_sat_synthetize() to reduce the number of states of a TBA. - dtgba_sat_synthetize(), dtgba_sat_minimize(), dtgba_sat_minimize_dichotomy(): Likewise, for deterministic TGBA. - is_complete(): Check whether a TGBA is complete. - tgba_complete(): Complete an automaton by adding a sink state if needed. - dtgba_complement(): Complement a deterministic TGBA. - satsolver(): Run an (external) SAT solver, honoring the SPOT_SATSOLVER environment variable if set. - tba_determinize(): Run a power-set construction, and attempt to fix the acceptance simulation to build a deterministic TBA. - dstar_parse(): Read a Streett or Rabin automaton in ltl2dstar's format. Note that this format allows only deterministic automata. - nra_to_nba(): Convert a (possibly non-deterministic) Rabin automaton to a non-deterministic Büchi automaton. - dra_to_ba(): Convert a deterministic Rabin automaton to a Büchi automaton, preserving acceptance in all SCCs where this is possible. - nsa_to_tgba(): Convert a (possibly non-deterministic) Streett automaton to a non-deterministic TGBA. - dstar_to_tgba(): Convert any automaton returned by dstar_parse() into a TGBA. - build_tgba_mask_keep(): Build a masked TGBA that shows only a subset of states of another TGBA. - build_tgba_mask_ignore(): Build a masked TGBA that ignore a subset of states of another TGBA. - class tgba_proxy: Helps writing on-the-fly algorithms that delegate most of their methods to the original automaton. - class bitvect: A dynamic bit vector implementation. - class word: An infinite word, stored as prefix + cycle, with a simplify() methods to simplify cycle and prefix in obvious ways. - class temporary_file: A temporary file. Can be instanciated with create_tmp_file() or create_open_tmpfile(). - count_state(): Return the number of states of a TGBA. Implement a couple of specializations for classes where is can be know without exploration. - to_latex_string(): Output a formula using LaTeX syntax. - relabel_bse(): Relabeling of Boolean Sub-Expressions. Implements ltlfilt's --relabel-bool option describe above. * Noteworthy internal changes: - When minimize_obligation() is not given the formula associated to the input automaton, but that automaton is deterministic, it can still attempt to call minimize_wdba() and check the correcteness using dtgba_complement(). This allows dstar2tgba to apply WDBA-minimization on deterministic Rabin automata. - tgba_reachable_iterator_depth_first has been redesigned to effectively perform a DFS. As a consequence, it does not inherit from tgba_reachable_iterator anymore. - postproc::set_pref() was used to accept an argument among Any, Small or Deterministic. These can now be combined with Complete as Any|Complete, Small|Complete, or Deterministic|Complete. - operands of n-ary operators (like & and |) are now ordered so that Boolean terms come first. This speeds up syntactic implication checks slightly. Also, literals are now sorted using strverscmp(), so that p5 comes before p12. - Syntactic implication checks have been generalized slightly (for instance 'a & b & F(a & b)' is now reduced to 'a & b' while it was not changed in previous versions). - All the parsers implemented in Spot now use the same type to store locations. - Cleanup of exported symbols All symbols in the library now have hidden visibility on ELF systems. Public classes and functions have been marked explicitely for export with the SPOT_API macro. During this massive update, some of functions that should not have been made public in the first place have been moved away so that they can only be used from the library. Some old of unused functions have been removed. removed: - class loopless_modular_mixed_radix_gray_code hidden: - class acc_compl - class acceptance_convertor - class bdd_allocator - class free_list * Bug fixes: - Degeneralization was not indempotant on automata with an accepting initial state that was on a cycle, but without self-loop. - Configuring with --enable-optimization would reset the value of CXXFLAGS. -- Alexandre Duret-Lutz

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