NEWS 182 KB
Newer Older
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1
New in spot 2.4.3.dev (not yet released)
2

3
4
5
6
7
8
9
10
  Build:

  - We no longuer distribute the doxygen-generated documentation in
    the tarball of Spot to save space.  This documentation is still
    available online at https://spot.lrde.epita.fr/doxygen/.  If you
    want to build a local copy you can configure Spot with
    --enable-doxygen, or simply run "cd doc && make doc".

11
12
  Tools:

13
14
15
16
  - genltl learned to generate a new family of formulas, taken from
    the SYNTCOMP competition on reactive synthesis:
    --gf-equiv=RANGE      (GFa{1} & GFa{2} & ... & GFa{n}) <-> GFz

17
18
19
20
21
22
  - genltl learned to generate 4 new families of formulas, taken
    from Müller & Sickert's GandALF'17 paper:
    --ms-example=RANGE     GF(a1&X(a2&X(a3&...)))&F(b1&F(b2&F(b3&...)))
    --ms-phi-h=RANGE       FG(a|b)|FG(!a|Xb)|FG(a|XXb)|FG(!a|XXXb)|...
    --ms-phi-r=RANGE       (FGa{n}&GFb{n})|((FGa{n-1}|GFb{n-1})&(...))
    --ms-phi-s=RANGE       (FGa{n}|GFb{n})&((FGa{n-1}&GFb{n-1})|(...))
23

24
25
26
27
  - autfilt learned --streett-like to convert an automaton in order to
    have a Streett-like acceptance condition. It only works with
    ω-automata having an acceptance in disjunctive normal form.

28
29
30
31
32
  - autfilt learned --dca to convert a Streett-like automaton or an
    automaton with an acceptance in disjunctive normal form to a
    deterministic co-Büchi automaton using the new functions
    [nsa-dnf]_to_dca() described below.

33
34
35
36
37
  - autfilt learned --acceptance-is=ACC to filter automata by
    acceptance condition.  ACC can be the name of some acceptance
    class (e.g. Büchi, Fin-less, Streett-like) or a precise acceptance
    formula in the HOA syntax.

38
39
40
41
42
43
44
45
46
  - ltlfilt learned to measure wall-time using --format=%r.

  - ltlfilt learned to measure cpu-time (as opposed to wall-time) using
    --format=%R. User or system time, for children or parent, can be
    measured separately by adding additional %[LETTER]R options.
    The difference between %r (wall-clock time) and %R (CPU time) can
    also be used to detect unreliable measurements. See
      https://spot.lrde.epita.fr/oaut.html#timing

Maximilien Colange's avatar
Maximilien Colange committed
47
48
  - ltlsynt is a new tool for synthesizing a controller from LTL/PSL
    specifications.
Thibaud Michaud's avatar
Thibaud Michaud committed
49

50
51
  - ltldo learned to limit the number of automata it outputs using -n.

52
53
  - autcross, ltlcross, and ltldo learned --fail-on-timeout.

54
55
56
57
58
59
60
  - ltlcross learned --reference=COMMANDFMT to specify a translator
    that should be trusted.  Doing so makes it possible to reduce the
    number of tests to be performed, as all other translators will be
    compared to the reference's output when available.  Multiple
    reference can be given; in that case other tools are compared
    against the smallest reference automaton.

61
62
63
64
  - The new -x tls-impl=N option allows to fine-tune the
    implication-based simplification rules of ltl2tgba.  See the
    spot-x man-page for details.

65
66
67
68
69
70
71
72
73
74
75
  - The --format=%g option of tools that output automata used to
    print the acceptance condition as a *formula* in the HOA format.
    This %g can now take optional arguments to print the acceptance
    *name* in different formats.  For instance

       ... | autfilt -o '%[s]g.hoa'

    will separate a stream of automata into different files named
    by their acceptance name (Buchi, co-Buchi, Streett, etc.) or
    "other" if no name is known for the acceptance condition.

76
77
78
  - Tools that produce formulas now support --format=%[OP]n to
    display the nesting depth of operator OP.

79
80
81
82
  - All tools learned to check the SPOT_OOM_ABORT environment
    variable.  This is only useful for debuging out-of-memory
    conditions; see the spot-x(7) man page for detail.

83
84
85
86
87
  Library:

  - Rename three methods of spot::scc_info. New names are clearer. The
    old names have been deprecated.

88
89
90
91
92
93
94
  - scc_info now takes an optional argument to disable some feature
    that are expansive and not always necessary.  By default scc_info
    tracks the list of all states that belong to an SCC (you may now
    ask it not to), tracks the successor SCCs of each SCC (that can
    but turned off), and explores all SCCs of the automaton (you may
    request to stop on the first SCC that is found accepting).

95
96
97
98
99
  - The new function scc_info::states_on_acc_cycle_of() is able to
    return all states visited by any accepting cycles of the
    specified SCC. It must only be called on automata with a
    Streett-like acceptance condition.

100
101
102
103
104
  - The new function dnf_to_streett() is able to convert any automaton
    with an acceptance condition in Disjunctive Normal Form to a
    Streett-like automaton. This is used by the new option
    '--streett-like' of autfilt.

105
106
107
108
109
110
111
112
  - The new functions spot::nsa_to_[nca-dca]()
    (or spot::dnf_to_[nca-dca]()) are able to convert when possible a
    Streett-like automaton (or any automaton with an acceptance in DNF)
    to an equivalent 'nca' (nondeterministic co-Büchi automaton) or
    'dca' (deterministic co-Büchi automaton).  Actually the resulting
    automaton will always recognize at least the same language.  It can
    recognize more if the original language can not be expressed with
    a co-Büchi acceptance condition.
113

114
115
116
117
118
119
120
121
122
123
124
  - The new functions spot::is_recurrence() and spot::is_persistence()
    check respectively if a formula f belongs to the recurrence or
    persistence class. Two algorithms are available, one that
    checks if a formula is cobuchi_realizable (then it belongs to the
    persistence class) and the other that checks if it is
    detbuchi_realizable (then it belongs to the recurrence class).
    Force one method or the other by setting the environment variable
    SPOT_PR_CHECK to 1 or 2.
    Note that thanks to the duality of both classes, both algorithms
    will work either on f or its negation.
    (see https://spot.lrde.epita.fr/hierarchy.html for details).
125

126
127
128
129
130
  - A new function spot::is_obligation() can be used to test whether a
    formula is an obligation.  This is used by ltlfilt --obligation,
    and the algorithm used can be controled by the SPOT_O_CHECK
    environment variable (see the spot-x(7) man page for details).

131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
  - The new function spot::is_colored() checks if an automaton is colored
    (i.e., every transition belongs to exactly one acceptance set)

  - The new function spot::change_parity() can convert an automaton with parity
    acceptance condition to an equivalent automaton with another type of parity
    acceptance condition. The type of a parity acceptance condition states
    whether it is an odd or even parity acceptance condition, and whether it is
    a min or max parity acceptance condition.

  - The new function spot::colorize_parity() can colorize an automaton with
    a parity acceptance condition. The resulting automaton is a parity automaton
    and every transition belongs to exactly one acceptance set.

  - The new function spot::cleanup_parity_acceptance() can simplify the
    acceptance condition of an automaton with parity acceptance condition. It
    removes the unused acceptance sets and merges acceptance sets to keep the
    parity acceptance condition.

  - The new functions spot::parity_product() and spot::parity_product_or()
    compute respectively the intersection and the union of two automata with
    parity acceptance condition and keep the parity acceptance condition.

153
154
155
156
  - The new function spot::remove_univ_otf() removes universal
    transitions on the fly from an alternating Büchi automaton
    using Miyano and Hayashi's breakpoint algorithm.

157
158
159
160
161
162
163
164
  - In some cases, spot::degeneralize() would output Büchi automata
    with more SCCs than its input.  This was hard to notice, because
    very often simulation-based simplifications remove those extra
    SCCs.  This situation is now detected by spot::degeneralized() and
    fixed before returning the automaton.  A new optionnal argument
    can be passed to disable this behavior (or use -x degen-remscc=0
    from the command-line).

165
166
167
168
  - The functions for detecting stutter-invariant formulas or automata
    have been overhauled.  Their interface changed slightly.  They are
    now fully documented.

169
170
171
  - In addition to detecting stutter-invariant formulas/automata, some
    can now study a stutter-sensitive automaton and detect the subset
    of states that are stutter-invariant.  See
172
    https://spot.lrde.epita.fr/ipynb/stutter-inv.html for examples.
173

174
175
176
177
178
  - Determinization has been heavily rewritten and optimized. The algorithm has
    (almost) not changed, but it runs muuuch faster now. It also features an
    optimization for stutter-invariant automata that may produce slightly
    smaller automata.

179
180
181
182
  - acc_cond::name(fmt) is a new method that name well-known acceptance
    conditions.   The fmt parameter specify the format to use for that
    name (e.g. to the style used in HOA, or that used by print_dot()).

183
184
185
186
187
188
189
190
191
192
  - spot::simplify_acceptance() was already merging identical acceptance
    sets, and detecting complementary sets i and j to perform the following
    simplifications
      Fin(i) & Inf(j) = Fin(i)
      Fin(i) | Inf(j) = Inf(i)
    It now additionally applies the following rules (again assuming i
    and j are complementary):
      Fin(i) & Fin(j) = f          Inf(i) | Inf(j) = t
      Fin(i) & Inf(i) = f          Fin(i) | Inf(i) = t

193
194
195
  - The new spot::formula::is_leaf() method can be used to detect
    formulas without children (atomic propositions, or constants).

196
197
198
199
  - spot::formula::map(fun) and spot::formula::traverse(fun) will
    accept additionnal arguments and pass them to fun().  See
    https://spot.lrde.epita.fr/tut03.html for some examples.

200
201
202
  - A the new function spot::nesting_depth() computes the nesting
    depth of any LTL operator.

Maximilien Colange's avatar
Maximilien Colange committed
203
204
205
206
207
208
209
210
211
  - The new function spot::print_aiger() encodes an automaton as an
    AIGER circuit and prints it. This is only possible for automata
    whose acceptance condition is trivial. It relies on a new named
    property "synthesis outputs" that describes which atomic
    propositions are to be encoded as outputs of the circuits.
    This function is used by ltlsynt to output the synthesized
    controllers in the format required by the synthesis tools
    competition SYNTCOMP.

212
213
214
  - The new function spot::check_determinism() sets both
    prop_semi_deterministic() and prop_universal() appropriately.

215
216
217
218
219
  Python:

  - The "product-states" property of automata is now accessible via
    spot.twa.get_product_states() and spot.set.get_product_states().

220
221
222
223
224
225
226
227
228
  Deprecation notices:

  (These functions still work but compilers emit warnings.)

  - spot::scc_info::used_acc(), spot::scc_info::used_acc_of() and
    spot::scc_info::acc() are deprecated. They have been renamed
    spot::scc_info::marks(), spot::scc_info::marks_of() and
    spot::scc_info::acc_sets_of() respectively.

229
230
231
232
  Backward incompatible changes:

  - The spot::closure(), spot::sl2(), spot::is_stutter_invariant()
    functions no longuer takes && arguments.  The former two have
233
234
    spot::closure_inplace() and spot::sl2_inplace() variants.  These
    functions also do not take a list of atomic propositions as an
235
236
    argument anymore.

237
238
239
240
  - The spot::bmrand() and spot::prand() functions have been removed.
    They were not used at all in Spot, and it's not Spot's objective
    to provide such random functions.

241
242
243
244
  - The spot::bdd_dict::register_all_propositions_of() function has
    been removed.  It's a low-level function was not used anywhere in
    Spot anymore, since it's better to use spot::twa::copy_ap_of().

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
245
New in spot 2.4.3 (2017-12-19)
246

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
247
  Bugs fixed:
248
249
250
251

  - couvreur99_new() leaked memory when processing TωA that allocate
    states.

252
253
  - Some mismatched placement-new/delete reported by ASAN were fixed.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
254
255
256
257
258
259
260
  - Static compilation was broken on MinGW.

  - Execution of Jupyter notebooks from the testsuite failed with
    recent versions of Python.

  - Fix some warnings triggered by the development version of g++.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
261
262
263
264
265
New in spot 2.4.2 (2017-11-07)

  Tools:

  - ltlcross and ltldo support ltl3tela, the new name of ltl3hoa.
266

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
267
268
269
270
271
  Bugs fixed:

  - Automata produced by "genaut --ks-nca=N" were incorrectly marked
    as not complete.

272
273
274
  - Fix some cases for which the highest setting of formulas
    simplification would produce worse results than lower settings.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
275
New in spot 2.4.1 (2017-10-05)
276

277
278
  Bugs fixed:

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
279
280
  - The formula class failed to build {a->c[*]} although it is
    allowed by our grammar.
281

282
283
284
285
286
287
288
289
290
291
  - spot::scc_info::determine_unknown_acceptance() incorrectly
    considered some rejecting SCC as accepting.

  - spot::streett_to_generalized_buchi() could generate automata with
    empty language if some Fin set did not intersect all accepting
    SCCs.  As a consequence, some Streett-like automata were
    considered empty even though they were not.  Also, the same
    function could crash on input that had a Streett-like acceptance
    not using all declared sets.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
292
293
294
295
  - The twa_graph::merge_edges() function relied on BDD IDs to sort
    edges.  This in turn caused some algorithms (like the
    degeneralization) to produce slighltly different (but still correct)
    outputs depending on the BDD operations performed before.
296

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
297
298
  - spot::simulation() could incorrectly flag an automaton as
    non-deterministic.
299

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
300
New in spot 2.4 (2017-09-06)
301

302
303
304
305
306
307
308
309
310
311
312
  Build:

  - Spot is now built in C++14 mode, so you need at least GCC 5 or
    clang 3.4.  The current version of all major linux distributions
    ship with at least GCC 6, which defaults to C++14, so this should
    not be a problem.  In *this* release of Spot, most of the header
    files are still C++11 compatible, so you should be able to include
    Spot in a C++11 project in case you do not yet want to upgrade.
    There is also an --enable-c++17 option to configure in case you
    want to force a build of Spot in C++17 mode.

313
314
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
315
316
317
318
319
320
321
322
  - genaut is a new binary that produces families of automata defined
    in the literature (in the same way as we have genltl for LTL
    formulas).

  - autcross is a new binary that compares the output of tools
    transforming automata (in the same way as we have ltlcross for
    LTL translators).

323
  - genltl learned two generate two new families of formulas:
324
325
326
327
328
329
      --fxg-or=RANGE         F(p0 | XG(p1 | XG(p2 | ... XG(pn))))
      --gxf-and=RANGE        G(p0 & XF(p1 & XF(p2 & ... XF(pn))))
    The later is a generalization of --eh-pattern=9, for which a
    single state TGBA always exists (but previous version of Spot
    would build larger automata).

330
  - autfilt learned to build the union (--sum) or the intersection
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
331
332
    (--sum-and) of two languages by putting two automata side-by-side
    and fiddling with the initial states.  This complements the already
333
334
    implemented intersection (--product) and union (--product-or),
    both based on a product.
335

336
  - autfilt learned to complement any alternating automaton with
337
    option --dualize.   (See spot::dualize() below.)
Thomas Medioni's avatar
Thomas Medioni committed
338

339
340
341
342
  - autfilt learned --split-edges to convert labels that are Boolean
    formulas into labels that are min-terms.  (See spot::split_edges()
    below.)

343
344
345
  - autfilt learned --simplify-acceptance to simplify some acceptance
    conditions.  (See spot::simplify_acceptance() below.)

346
347
348
349
  - autfilt --decompote-strength has been renamed to --decompose-scc
    because it can now extract the subautomaton leading to an SCC
    specified by number.  (The old name is still kept as an alias.)

350
351
352
  - The --stats=%c option of tools producing automata can now be
    restricted to count complete SCCs, using %[c]c.

353
354
355
356
357
358
  - Tools producing automata have a --stats=... option, and tools
    producing formulas have a --format=... option.  These two options
    work similarly, the use of different names is just historical.
    Starting with this release, all tools that recognize one of these
    two options also accept the other one as an alias.

359
360
  Library:

361
362
  - A new library, libspotgen, gathers all functions used to generate
    families of automata or LTL formulas, used by genltl and genaut.
363

364
  - spot::sum() and spot::sum_and() implements the union and the
365
    intersection of two automata by putting them side-by-side and
366
    using non-deterministim or universal branching on the initial
367
    state.
368

369
370
371
  - twa objects have a new property: prop_complete().  This obviously
    acts as a cache for the is_complete() function.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
372
  - spot::dualize() complements any alternating automaton.  Since
373
374
375
    the dual of a deterministic automaton is still deterministic, the
    function spot::dtwa_complement() has been deprecated and simply
    calls spot::dualize().
376

377
378
379
380
381
382
  - spot::decompose_strength() was extended and renamed to
    spot::decompose_scc() as it can now also extract a subautomaton
    leading to a particular SCC.  A demonstration of this feature via
    the Python bindings can be found at
    https://spot.lrde.epita.fr/ipynb/decompose.html

383
384
  - The print_dot() function will now display names for well known
    acceptance conditions under the formula when option 'a' is used.
385
386
    We plan to enable 'a' by default in a future release, so a new
    option 'A' has been added to hide the acceptance condition.
387

388
389
390
391
392
  - The print_dot() function has a new experimental option 'x' to
    output labels are LaTeX formulas.  This is meant to be used in
    conjunction with the dot2tex tool.  See
      https://spot.lrde.epita.fr/oaut.html#dot2tex

393
394
395
396
  - A new named property for automata called "original-states" can be
    used to record the origin of a state before transformation.  It is
    currently defined by the degeneralization algorithms, and by
    transform_accessible() and algorithms based on it (like
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
397
398
399
400
401
    remove_ap::strip(), decompose_scc()).  This is realy meant as an
    aid for writing algorithms that need this mapping, but it can also
    be used to debug these algorithms: the "original-states"
    information is displayed by the dot printer when the 'd' option is
    passed.  For instance in
402
403
404
405
406
407
408

      % ltl2tgba 'GF(a <-> Fb)' --dot=s
      % ltl2tgba 'GF(a <-> Fb)' | autfilt -B --dot=ds

    the second command outputs an automaton with states that show
    references to the first one.

409
410
411
412
  - A new named property for automata called "degen-levels" keeps track
    of the level of a state in a degeneralization. This information
    complements the one carried in "original-states".

413
414
415
416
417
  - A new named property for automata called "simulated-states" can be
    used to record the origin of a state through simulation. The
    behavior is similar to "original-states" above. Determinization
    takes advantage of this in its pretty print.

418
419
420
421
422
423
  - The new function spot::acc_cond::is_streett_like() checks whether
    an acceptance condition is conjunction of disjunctive clauses
    containing at most one Inf and at most one Fin.  It builds a
    vector of pairs to use if we want to assume the automaton has
    Streett acceptance.  The dual function is
    spot::acc_cond::is_rabin_like() works similarly.
424

425
426
427
428
429
  - The degeneralize() function has learned to consider acceptance
    marks common to all edges comming to a state to select its initial
    level.  A similar trick was already used in sbacc(), and saves a
    few states in some cases.

430
431
432
433
434
435
436
  - There is a new spot::split_edges() function that transforms edges
    (labeled by Boolean formulas over atomic propositions) into
    transitions (labeled by conjunctions where each atomic proposition
    appear either positive or negative).  This can be used to
    preprocess automata before feeding them to algorithms or tools
    that expect transitions labeled by letters.

437
438
439
  - spot::scc_info has two new methods to easily iterate over the
    edges of an SCC: edges_of() and inner_edges_of().

440
441
442
  - spot::scc_info can now be passed a filter function to ignore
    or cut some edges.

443
444
445
446
447
  - spot::scc_info now keeps track of acceptance sets that are common
    to all edges in an SCC.  These can be retrieved using
    scc_info::common_sets_of(scc), and they are used by scc_info to
    classify some SCCs as rejecting more easily.

448
449
450
451
452
453
  - The new function acc_code::remove() removes all the given
    acceptance sets from the acceptance condition.

  - It is now possible to change an automaton acceptance condition
    directly by calling twa::set_acceptance().

454
455
456
457
458
  - spot::cleanup_acceptance_here now takes an additional boolean
    parameter specifying whether to strip useless marks from the
    automaton.  This parameter is defaulted to true, in order to
    keep this modification backward-compatible.

459
460
461
462
  - The new function spot::simplify_acceptance() is able to perform
    some simplifications on an acceptance condition, and might lead
    to the removal of some acceptance sets.

463
  - The function spot::streett_to_generalized_buchi() is now able to
464
    work on automata with Streett-like acceptance.
465

466
467
468
469
470
  - The function for converting deterministic Rabin automata to
    deterministic Büchi automata (when possible), internal to the
    remove_fin() procedure, has been updated to work with
    transition-based acceptance and with Rabin-like acceptance.

471
472
473
474
  - spot::relabel_here() was used on automata to rename atomic
    propositions, it can now replace atomic propositions by Boolean
    subformula.  This makes it possible to use relabeling maps
    produced by relabel_bse() on formulas.
475

476
477
478
479
  - twa_graph::copy_state_names_from() can be used to copy the state
    names from another automaton, honoring "original-states" if
    present.

480
481
  - Building automata for LTL formula with a large number N of atomic
    propositions can be costly, because several loops and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
482
    data-structures are exponential in N.  However a formula like
483
484
485
486
487
488
489
490
      ((a & b & c) | (d & e & f)) U ((d & e & f) | (g & h & i))
    can be translated more efficiently by first building an automaton
    for (p0 | p1) U (p1 | p2), and then substituting p0, p1, p2 by the
    appropriate Boolean formula.  Such a trick is now attempted
    for translation of formulas with 4 atomic propositions or
    more (this threshold can be changed, see -x relabel-bool=N in
    the spot-x(7) man page).

491
492
493
494
  - The LTL simplification routines learned that an LTL formula like
    G(a & XF(b & XFc & Fd) can be simplified to G(a & Fb & Fc & Fd),
    and dually F(a | XG(b | XGc | Gd)) = F(a | Gb | Gc | Gd).

495
496
497
498
    When working with SERE, the simplification of "expr[*0..1]" was
    improved.  E.g. {{a[*]|b}[*0..1]} becomes {a[*]|b} instead of
    {{a[+]|b}[*0..1]}.

499
500
501
502
  - The new function spot::to_weak_alternating() is able to take an
    input automaton with generalized Büchi/co-Büchi acceptance and
    convert it to a weak alternating automaton.

503
504
  - spot::sbacc() is can now also convert alternating automata
    to state-based acceptance.
505

506
507
508
  - spot::sbacc() and spot::degeneralize() learned to merge
    accepting sinks.

509
  - If the SPOT_BDD_TRACE environment variable is set, statistics
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
510
511
    about BDD garbage collection and table resizing are shown.

512
  - The & and | operators for acceptannce conditions have been changed
513
    slightly to be more symmetrical.  In older versions, operator &
514
515
516
517
    would move Fin() terms to the front, but that is not the case
    anymore.  Also operator & was already grouping all Inf() terms
    (for efficiency reasons), in this version operator | is
    symmetrically grouping all Fin() terms.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
518

519
520
521
522
  - The automaton parser is now reentrant, making it possible to
    process automata from different streams at the same time (i.e.,
    using multiple spot::automaton_stream_parser instances at once).

523
524
525
526
527
528
529
530
531
  - The print_hoa() and parse_automaton() functions have been updated
    to recognize the "exist-branch" property of the non-released HOA
    v1.1, as well as the new meaning of property "deterministic".  (In
    HOA v1 "properties: deterministic" means that the automaton has no
    existential branching; in HOA v1.1 it disallows universal
    branching as well.)  The meaning of "deterministic" in Spot has
    been adjusted to these new semantics, see "Backward-incompatible
    changes" below.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
532
  - The parser for HOA now recognizes and verifies correct use of the
533
    "univ-branch" property.  This is known to be a problem with option
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
534
    -H1 of ltl3ba 1.1.2 and ltl3dra 0.2.4, so the environment variable
535
536
    SPOT_HOA_TOLERANT can be set to disable the diagnostic.

537
538
539
540
541
  Python:

  - The 'spot.gen' package exports the functions from libspotgen.
    See https://spot.lrde.epita.fr/ipynb/gen.html for examples.

542
543
544
545
  Bugs fixed:

  - When the remove_fin() function was called on some automaton with
    Inf-less acceptance involving at least one disjunction (e.g.,
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
546
    generalized co-Büchi), it would sometimes output an automaton with
547
548
    transition-based acceptance but marked as state-based.

549
550
  - The complete() function could complete an empty co-Büchi automaton
    into an automaton accepting everything.
551

552
553
554
555
556
557
558
559
560
561
  Backward-incompatible changes:

  - spot::acc_cond::mark_t::operator bool() has been marked as
    explicit.  The implicit converion to bool (and, via bool, to int)
    was a source of bugs.

  - spot::twa_graph::set_init_state(const state*) has been removed.
    It was never used.  You always want to use
    spot::twa_graph::set_init_state(unsigned) in practice.

562
563
564
565
566
567
568
  - The previous implementation of spot::is_deterministic() has been
    renamed to spot::is_universal().  The new version of
    spot::is_deterministic() requires the automaton to be both
    universal and existential.  This should not make any difference in
    existing code unless you work with the recently added support for
    alternating automata.

569
570
571
  - spot::acc_cond::mark_t::sets() now returns an internal iterable
    object instead of an std::vector<unsigned>.

572
573
574
575
  - The color palette optionally used by print_dot() has been extended
    from 9 to 16 colors.  While the first 8 colors are similar, they
    are a bit more saturated now.

576
  deprecation notices:
577

578
  (these functions still work but compilers emit warnings.)
579

580
581
582
  - spot::decompose_strength() is deprecated, it has been renamed
    to spot::decompose_scc().

583
  - spot::dtwa_complement() is deprecated.  prefer the more generic
584
585
    spot::dualize() instead.

586
  - the spot::twa::prop_deterministic() methods have been renamed to
587
    spot::twa::prop_universal() for consistency with the change to
588
    is_deterministic() listed above.  we have kept
589
590
    spot::twa::prop_deterministic() as a deprecated synonym for
    spot::twa::prop_universal() to help backward compatibility.
591

592
  - the spot::copy() function is deprecated.  use
593
594
    spot::make_twa_graph() instead.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
595
New in spot 2.3.5 (2017-06-22)
596

597
598
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
599
  - We have fixed new cases where translating multiple formulas in a
600
601
    single ltl2tgba run could produce automata different from those
    produced by individual runs.
602

603
604
605
606
607
  - The print_dot() function had a couple of issues when printing
    alternating automata: in particular, when using flag 's' (display
    SCC) or 'y' (split universal destination by colors) universal
    edges could be connected to undefined states.

608
609
610
611
612
613
  - Using --stats=%s or --stats=%s or --stats=%t could take an
    unnecessary long time on automata with many atomic propositions,
    due to a typo.  Furthermore, %s/%e/%t/%E/%T were printing
    a number of reachable states/edges/transitions, but %S was
    incorrectly counting all states even unreachable.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
614
615
616
  - Our verson of BuDDy had an incorrect optimization for the
    biimp operator.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
617
New in spot 2.3.4 (2017-05-11)
618

619
620
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
621
  - The transformation to state-based acceptance (spot::sbacc()) was
622
    incorrect on automata where the empty acceptance mark is accepting.
623

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
624
  - The --help output of randaut and ltl2tgba was showing an
625
626
    unsupported %b stat.

627
628
629
  - ltldo and ltlcross could leave temporary files behind when
    aborting on error.

630
631
632
633
  - The LTL simplifcation rule that turns F(f)|q into F(f|q)
    when q is a subformula that is both eventual and universal
    was documented but not applied in some forgotten cases.

634
635
636
637
  - Because of some caching inside of ltl2tgba, translating multiple
    formula in single ltl2tgba run could produce automata different
    from those produced by individual runs.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
638
New in spot 2.3.3 (2017-04-11)
639

640
641
642
643
644
  Tools:

  - ltldo and ltlcross learned shorthands to talk to ltl2da, ltl2dpa,
    and ltl2ldba (from Owl) without needing to specify %f>%O.

645
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
646
647
648
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
649

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
650
  Bugs fixed:
651

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
652
653
  - In "lenient" mode the formula parser would fail to recover from a
    missing closing brace.
654

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
655
656
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F' had
    typos.
657

658
659
660
661
  - 'ltl2tgba Fa | autfilt --complement' would incorrectly claim that
    the output is "terminal" because dtwa_complement() failed to reset
    that property.

662
663
664
  - spot::twa_graph::purge_unreachable_states() was misbehaving on
    alternating automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
665
666
  - In bench/stutter/ the .cc files were not compiling due to warnings
    being caught as errors.
667

668
669
670
671
672
673
  - The code in charge of detecting DBA-type Rabin automata is
    actually written to handle a slightly larger class of acceptance
    conditions (e.g., Fin(0)|(Fin(1)&Inf(2))), however it failed to
    correctly detect DBA-typeness in some of these non-Rabin
    acceptance.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
674
New in spot 2.3.2 (2017-03-15)
675

676
677
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
678
  - In tools that output automata, the number of atomic propositions
679
    can be output using --stats=%x (output automaton) or --stats=%X
680
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
681
    atomic propositions instead of counting them.  Tools that output
682
    formulas also support --format=%x for this purpose.
683

684
685
  Python:

686
687
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
688

689
690
691
692
693
  Documentation:

  - https://spot.lrde.epita.fr/tut11.html is a new page describing
    how to build monitors in Shell, Python, or C++.

694
695
696
697
698
  Bugs fixed:

  - The tests using LTSmin's patched version of divine would fail
    if the current (non-patched) version of divine was installed.

699
700
701
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

702
703
704
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

705
706
707
708
  - a typo in the code for transformating transition-based acceptance
    to state-based acceptance could cause a superfluous initial state
    to be output in some cases (the result was still correct).

709
710
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
711
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
712
713
714
715
    could be 'inherently-weak' or 'terminal', while 'ltl2tgba -M -D'
    would always report 'weak' automata.  Both variants now report the
    most precise between 'weak' or 'terminal'.

716
717
718
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
719
  - The Python wrappers for spot::twa_graph::state_from_number and
720
721
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
722
  - Instantiating an emptiness check on an automaton with unsupported
723
724
725
726
    acceptance condition should throw an exception.  This used to be
    just an assertion, disabled in release builds; the difference
    matters for the Python bindings.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
727
  Deprecation notice:
728
729
730
731

  - Using --format=%a to print the number of atomic propositions in
    ltlfilt, genltl, and randltl still works, but it is not documented
    anymore and should be replaced by the newly-introduced --format=%x
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
732
733
    for consistency with tools producing automata, where %a means
    something else.
734

735

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
736
New in spot 2.3.1 (2017-02-20)
737

738
739
740
741
742
743
  Tools:

  - ltldo learnt to act like a portfolio: --smallest and --greatest
    will select the best output automaton for each formula translated.
    See https://spot.lrde.epita.fr/ltldo.html#portfolio for examples.

744
745
746
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

747
748
749
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

750
751
752
753
754
  - genltl learnt three new families for formulas: --kr-n2=RANGE,
    --kr-nlogn=RANGE, and --kr-n=RANGE.  These formulas, from
    Kupferman & Rosenberg [MoChArt'10] are recognizable by
    deterministic Büchi automata with at least 2^2^n states.

755
756
757
758
  Library:

  - spot::twa_run::as_twa() has an option to preserve state names.

759
760
761
762
  - the method spot::twa::is_alternating(), introduced in Spot 2.3 was
    badly named and has been deprecated.  Use the negation of the new
    spot::twa::is_existential() instead.

763
764
765
766
767
768
769
  Bugs fixed:

  - spot::otf_product() was incorrectly registering atomic
    propositions.

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
770

771
772
773
774
775
776
  - The spot::acc_word type (used to construct acceptance condition)
    was using some non-standard anonymous struct.  It is unlikely that
    this type was actually used outside Spot, but if you do use it,
    spot::acc_word::op and spot::acc_word::type had to be renamed as
    spot::acc_word::sub.op and spot::acc_word::sub.type.

777
778
779
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

780
781
782
783
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

784
785
786
787
  - The display of clusters with universal edges was confused, because the
    intermediate node was not in the cluster even if one of the target was
    in the same one.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
788
New in spot 2.3 (2017-01-19)
789

790
791
792
793
794
795
796
797
798
799
800
  Build:

  * While Spot only relies on C++11 features, the configure script
    learned --enable-c++14 to compile in C++14 mode.  This allows us
    check that nothing breaks when we will switch to C++14.

  * Spot is now distributed with PicoSAT 965, and uses it for
    SAT-based minimization of automata without relying on temporary
    files.  It is still possible to use an external SAT solver by
    setting the SPOT_SATSOLVER environment variable.

801
802
803
  * The development Debian packages for Spot now install static
    libraries as well.

804
805
  * We now install configuration files for users of pkg-config.

806
807
  Tools:

808
809
810
  * ltlcross supports translators that output alternating automata in
    the HOA format.  Cross-comparison checks will only work with weak
    alternating automata (not necessarily *very* weak), but "ltlcross
811
812
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
813

814
815
816
817
818
819
  * autfilt can read alternating automata.  This is still experimental
    (see below). Some of the algorithms proposed by autfilt will
    refuse to work because they have not yet been updated to work with
    alternating automata, but in any case they should display a
    diagnostic: if you see a crash, please report it.

820
821
822
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

823
824
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
825

826
  * autfilt --highlight-languages will color states that recognize
827
    identical languages.  (Only works for deterministic automata.)
828

829
830
831
832
833
  * 'autfilt --sat-minimize' and 'ltl2tgba -x sat-minimize' have
    undergone some backward incompatible changes.  They use binary
    search by default, and support different options than they used
    too.  See spot-x(7) for details.  The defaults are those that were
    best for the benchmark in bench/dtgbasat/.
834

835
836
837
838
  * ltlfilt learned --recurrence and --persistence to match formulas
    belonging to these two classes of the temporal hierarchy.  Unlike
    --syntactic-recurrence and --syntactic-persistence, the new checks
    are automata-based and will also match pathological formulas.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
839
    See https://spot.lrde.epita.fr/hierarchy.html
840

841
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
842
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
843
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
844

845
846
847
848
849
850
  * ltldo and ltlcross learned a --relabel option to force the
    relabeling of atomic propositions to p0, p1, etc.  This is more
    useful with ltldo, as it allows calling a tool that restricts the
    atomic propositions it supports, and the output automaton will
    then be fixed to use the original atomic propositions.

851
852
853
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

854
855
856
  Library:

  * A twa is required to have at least one state, the initial state.
857
858
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
859

860
  * Couvreur's emptiness check has been rewritten to use the explicit
861
862
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
863
864
865
    automata.  Overall, this new version is roughly 4x faster on
    explicit automata than the former one.  The old version has been
    kept for backward compatibility, but will be removed eventually.
866

867
  * The new version of the Couvreur emptiness check is now the default
868
869
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
870

871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
  * experimental support for alternating automata:

    - twa_graph objects can now represent alternating automata.  Use
      twa_graph::new_univ_edge() and twa_graph::set_univ_init_state()
      to create universal edges an initial states; and use
      twa_graph::univ_dests() to iterate over the universal
      destinations of an edge.

    - the automaton parser will now read alternating automata in the
      HOA format.  The HOA and dot printers can output them.

    - the file twaalgos/alternation.hh contains a few algorithms
      specific to alternating automata:
      + remove_alternation() will transform *weak* alternating automata
        into TGBA.
      + the class outedge_combiner can be used to perform "and" and "or"
        on the outgoing edges of some alternating automaton.

889
    - scc_info has been adjusted to handle universal edges as if they
890
891
892
      were existential edges.  As a consequence, acceptance
      information is not accurate.

893
894
895
896
897
898
899
    - postprocessor will call remove_alternation() right away, so
      it can be used as a way to transform alternating automata
      into different sub-types of (generalized) Büchi automata.
      Note that although prostprocessor optimize the resulting
      automata, it still has no simplification algorithms that work
      at the alternating automaton level.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
900
901
902
    - See https://spot.lrde.epita.fr/tut23.html
      https://spot.lrde.epita.fr/tut24.html and
      https://spot.lrde.epita.fr/tut31.html for some code examples.
903

904
905
906
907
  * twa objects have two new properties, very-weak and
    semi-deterministic, that can be set or retrieved via
    twa::prop_very_weak()/twa::prop_semi_deterministic(), and that can
    be tested by is_very_weak_automaton()/is_semi_deterministic().
908

909
910
911
912
913
914
  * twa::prop_set has a new attribute used in twa::prop_copy() and
    twa::prop_keep() to indicate that determinism may be improved by
    an algorithm.  In other words properties like
    deterministic/semi-deterministic/unambiguous should be preserved
    only if they are positive.

915
  * language_map() and highlight_languages() are new functions that
916
    implement autfilt's --highlight-languages option mentionned above.
917

918
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
919
    use language_map() to estimate a lower bound for binary search.
920

921
  * The encoding part of SAT-based minimization consumes less memory.
922

923
924
925
926
  * SAT-based minimization of automata can now be done using two
    incremental techniques that take a solved minimization and attempt
    to forbid the use of some states.  This is done either by adding
    clauses, or by using assumptions.
927

928
929
930
931
  * If the environment variable "SPOT_XCNF" is set during incremental
    SAT-based minimization, XCNF files suitable for the incremental SAT
    competition will be generated.  This requires the use of an exteral
    SAT solver, setup with "SPOT_SATSOLVER".  See spot-x(7).
932

933
934
935
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

936
937
938
939
940
941
942
943
944
Python:

  * spot.show_mp_hierarchy() can be used to display the membership of
    a formula to the Manna & Pnueli hierarchy, in notebooks.  An
    example is in https://spot.lrde.epita.fr/ipynb/formulas.html

  * The on-line translator will now display the temporal hierarchy
    in the "Formula > property information" output.

945
Bugs fixed:
946
947
948
949
950
951
952
953

  * The minimize_wdba() function was not correctly minimizing automata
    with useless SCCs.  This was not an issue for the LTL translation
    (where useless SCCs are always removed first), but it was an issue
    when deciding if a formula was safety or guarantee.  As a
    consequence, some tricky safety or guarantee properties were only
    recognized as obligations.

954
955
956
957
  * When ltlcross was running a translator taking the Spin syntax as
    input (%s) it would not automatically relabel any unsupported
    atomic propositions as ltldo already do.

958
959
960
961
  * When running "autfilt --sat-minimize" on a automaton representing
    an obligation property, the result would always be a complete
    automaton even without the -C option.

962
963
964
  * ltlcross --products=0 --csv should not output any product-related
    column in the CSV output since it has nothing to display there.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
965
New in spot 2.2.2 (2016-12-16)
966

967
968
969
970
971
  Build:

  * If the system has an installed libltdl library, use it instead of
    the one we distribute.

972
973
974
975
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
976

977
978
979
980
981
  * is_terminal() should reject automata that have accepting
    transitions going into rejecting SCCs.  The whole point of
    being a terminal automaton is that reaching an accepting
    transition guarantees that any suffix will be accepted.

982
983
984
985
986
  * The HOA parser incorrectly read "Acceptance: 1 Bar(0)" as a valid
    way to specify "Acceptance: 1 Fin(0)" because it assumed that
    everything that was not Inf was Fin.  These errors are now
    diagnosed.

987
988
989
990
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

991
992
993
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

994
995
996
  * the on-line translator had a bug where a long ltl3ba process would
    continue running even after the script had timeout'ed.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
997
New in spot 2.2.1 (2016-11-21)
998

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
999
  Bug fix:
1000

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1001
1002
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
1003

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1004
New in spot 2.2 (2016-11-14)
1005

1006
1007
1008
1009
1010
1011
  Command-line tools:

  * ltlfilt has a new option --from-ltlf to help reducing LTLf (i.e.,
    LTL over finite words) model checking to LTL model checking.  This
    is based on a transformation by De Giacomo & Vardi (IJCAI'13).

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1012
1013
1014
1015
  * "ltldo --stats=%R", which used to display the serial number of the
    formula processed, was renamed to "ltldo --stats=%#" to free %R
    for the following feature.

1016
1017
1018
  * autfilt, dstar2tgba, ltl2tgba, ltlcross, ltldo learned to measure
    cpu-time (as opposed to wall-time) using --stats=%R.  User or
    system time, for children or parent, can be measured separately by
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1019
1020
1021
1022
    adding additional %[LETTER]R options.  The difference between %r
    (wall-clock time) and %R (CPU time) can also be used to detect
    unreliable measurements.  See
      https://spot.lrde.epita.fr/oaut.html#timing
1023

1024
1025
  Library:

1026
1027
1028
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

1029
  * is_unambiguous() was rewritten in a more efficient way.
1030

1031
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1032
    of a single self-loop without resorting to remove_fin() for complex
1033
1034
1035
1036
1037
1038
    acceptance conditions.

  * remove_fin() has been improved to better deal with automata with
    "unclean" acceptance, i.e., acceptance sets that are declared but
    not used.  In particular, this helps scc_info to be more efficient
    at deciding the acceptance of SCCs in presence of Fin acceptance.
1039

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1040
1041
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
1042
1043
1044
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

1045
1046
  * scc_filter() learned to preserve state names and highlighted states.

1047
1048
1049
1050
1051
  * The BuDDy library has been slightly optimized: the initial setup
    of the unicity table can now be vectorized by GCC, and all calls
    to setjmp are now avoided when variable reordering is disabled
    (the default).

1052
1053
1054
1055
1056
1057
1058
1059
  * The twa class has three new methods:
      aut->intersects(other)
      aut->intersecting_run(other)
      aut->intersecting_word(other)
    currently these are just convenient wrappers around
      !otf_product(aut, other)->is_empty()
      otf_product(aut, other)->accepting_run()->project(aut)
      otf_product(aut, other)->accepting_word()
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1060
1061
1062
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
1063

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1064
  Bug fixes:
1065

1066
  * ltl2tgba was always using the highest settings for the LTL
1067
1068
1069
1070
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

1071
1072
1073
  * The int-vector compression code could encode 6 and 22 in the
    same way, causing inevitable issues in our LTSmin interface.
    (This affects tests/ltsmin/modelcheck with option -z, not -Z.)
1074

1075
1076
1077
  * str_sere() and str_utf8_sere() were not returning the same
    string that print_sere() and print_utf8_sere() would print.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1078
  * Running the LTL parser in debug mode would crash.
1079

1080
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1081
    when run with use_simulation=true (the default) on non-simplified
1082
1083
    automata.

1084
1085
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
1086
1087
1088
1089
    anymore.  Before that the spot.automata() python function used to
    close a file descriptor twice when reading from a pipe, and this
    led to crashes of the 0MQ library used by Jupyter, killing the
    Python kernel.
1090

1091
1092
1093
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1094
1095
1096
  * calling set_acceptance() several times on an automaton could
    result in unexpected behaviors, because set_acceptance(0,...)
    used to set the state-based acceptance flag automatically.
1097

1098
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1099
    of place by the on-line translator.
1100

1101
New in spot 2.1.2 (2016-10-14)
1102

1103
1104
1105
1106
1107
1108
  Command-line tools:

  * genltl learned 5 new families of formulas
    (--tv-f1, --tv-f2, --tv-g1, --tv-g2, --tv-uu)
    defined in Tabakov & Vardi's RV'10 paper.

1109
1110
1111
1112
1113
1114
  * ltlcross's --csv and --json output was changed to not include
    information about the ambiguity or strength of the automata by
    default.   Computing those can be costly and not needed by
    every user, so it should now be requested explicitely using
    options --strength and --ambiguous.

1115
1116
1117
1118
1119
1120
1121
1122
  Library:

  * New LTL simplification rule:

    - GF(f & q) = G(F(f) & q) if q is
      purely universal and a pure eventuality.  In particular
      GF(f & GF(g)) now ultimately simplifies to G(F(f) & F(g)).

1123
1124
  Bug fixes:

1125
  * Fix spurious uninitialized read reported by valgrind when
1126
    is_Kleene_star() is compiled by clang++.
1127

1128
  * Using "ltlfilt some-large-file --some-costly-filter" could take
1129
1130
1131
1132
1133
1134
1135
    to a lot of time before displaying the first results, because the
    output of ltlfilt is buffered: the buffer had to fill up before
    being flushed.  The issue did not manifest when the input is
    standard input, because of the C++ feature that reading std::cin
    should flush std::cout; however it was well visible when reading
    from files.  Flushing is now done more regularly.

1136
1137
1138
1139
  * Fix compilation warnings when -Wimplicit-fallthrough it enabled.

  * Fix python errors on Darwin when using methods from the spot module
    inside of the spot.ltsmin submodule.
1140

1141
1142
  * Fix ltlcross crash when combining --no-check with --verbose.

1143
1144
1145
  * Adjust paths and options used in bench/dtgbasat/ to match the
    changes introduced in Spot 2.0.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1146
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1147

1148
1149
1150
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1151
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1152
1153
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
1154
1155
1156
1157
       genltl --dac --format='%s,%f' | sort -n | cut -d, -f2
    or to group formulas by number of atomic propositions:
       genltl --dac --output='ap-%a.ltl'

1158
1159
1160
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

1161
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1162
    now accepts options to filter the SCCs to count.  For instance
1163
1164
1165
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

1166
1167
1168
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
1169
    write errors (e.g. when writing to a filesystem that is full).
1170
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1171

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1172
New in spot 2.1 (2016-08-08)
1173

1174
1175
  Command-line tools:

1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
  * All tools that input formulas or automata (i.e., autfilt,
    dstar2tgba, ltl2tgba, ltl2tgta, ltlcross, ltldo, ltlfilt,
    ltlgrind) now have a more homogeneous handling of the default
    input.

    - If no formula/automaton have been specified, and the standard
    input is a not a tty, then the default is to read that. This is a
    change for ltl2tgba and ltl2tgta.  In particular, it simplifies

        genltl --dac | ltl2tgba -F- | autfilt ...

    into

        genltl --dac | ltl2tgba | autfilt ...

    - If standard input is a tty and no other input has been
    specified, then an error message is printed.  This is a change for
    autfilt, dstar2tgba, ltlcross, ltldo, ltlfilt, ltlgrind, that used
    to expect the user to type formula or automata at the terminal,
    confusing people.

    - All tools now accept - as a shorthand for -F-, to force reading
    input from the standard input (regardless of whether it is a tty
    or not).  This is a change for ltl2tgba, ltl2tgta, ltlcross, and
    ltldo.

1202
1203
1204
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

1205
1206
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
    arguments, and redirection of stdin and stdout, but nothing more).

  * ltlcross and ltldo learned a new syntax to specify that an input
    formula should be written in some given syntax after rewriting
    some operators away.  For instance the defaults arguments passed
    to ltl2dstar have been changed from
         --output-format=hoa %L %O
    into
         --output-format=hoa %[WM]L %O
    where [WM] specifies that operators W and M should be rewritten
    away.  As a consequence running
         ltldo ltl2dstar -f 'a M b'
    will now work and call ltl2dstar on the equivalent formula
    'b U (a & b)' instead.  The operators that can be listed between
    brackets are the same as those of ltlfilt --unabbreviate option.

  * ltlcross learned to show some counterexamples when diagnosing
    failures of cross-comparison checks against random state spaces.
1225

1226
1227
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
1228
1229
1230
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

1231
  * autfilt learned --remove-unused-ap to remove atomic propositions
1232
1233
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
1234
    declare atomic propositions (HOA & DSTAR).
1235

1236
  * autfilt learned two options to filter automata by count of used or
1237
1238
1239
1240
    unused atomic propositions: --used-ap=RANGE --unused-ap=RANGE.
    These differ from --ap=RANGE that only consider *declared* atomic
    propositions, regardless of whether they are actually used.

1241
1242
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
1243

1244
  * autfilt learned to filter automata representing stutter-invariant
1245
1246
    properties with --is-stutter-invariant.

1247
  * autfilt learned two new options to highlight non-determinism:
1248
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
1249
1250
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
1251

1252
  * autfilt learned to highlight a run matching a given word using the
1253
1254
1255
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

1256
1257
1258
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

1259
  * genltl learned three new families: --dac-patterns=1..45,
1260
1261
1262
    --eh-patterns=1..12, and --sb-patterns=1..27.  Unlike other options
    these do not output scalable patterns, but simply a list of formulas
    appearing in these three papers: Dwyer et al (FMSP'98), Etessami &
1263
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
1264

1265
1266
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
1267

1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
  * The formater used by --format (for ltlfilt, ltlgrind, genltl,
    randltl) or --stats (for autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut) learned to recognize double-quoted fields and double the
    double-quotes output inbetween as expected from RFC4180-compliant
    CSV files.  For instance
      ltl2tgba -f 'a U "b+c"' --stats='"%f",%s'
    will output
      "a U ""b+c""",2

  * The --csv-escape option of genltl, ltlfilt, ltlgrind, and randltl
    is now deprecated.  The option is still here, but hidden and
    undocumented.

1281
1282
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
1283
    sense) automaton as a HOA one-liner using %h (or %H), helping to
1284
1285
    create CSV files contained automata.

1286
1287
1288
1289
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

1290
1291
1292
  * Arguments passed to -x (in ltl2tgba, ltl2tgta, autfilt, dstar2tgba)
    that are not used are now reported as they might be typos.
    This ocurred a couple of times in our test-suite.  A similar
1293
    check is done for the arguments of autfilt --sat-minimize=...
1294

1295
1296
1297
1298
1299
1300
1301
1302
1303
  Library:

  * The print_hoa() function will now output version 1.1 of the HOA
    format when passed the "1.1" option (i.e., use -H1.1 from any
    command-line tool).  As far as Spot is concerned, this allows
    negated properties to be expressed.  Version 1 of the HOA format
    is still the default, but we plan to default to version 1.1 in the
    future.

Alexandre Duret-Lutz's avatar