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Introduce rational operators and trivial simplification rules.

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Trivial simplifications rules (such as "FFa=Fa" or "x&1=x")
are performed any time a formule is instanciated.

* src/ltlast/constant.hh, src/ltlast/constant.cc
(true_instance, true_instance_): Declare the true_instance_ as a
static member, and move true_instance() into the .hh so it gets
inlined.  Have true_instance_ as a class variable will ensure that
it is the first formula instantiated.  Binop simplifications rely
on this to order arguments.
(false_instance, false_instance_): Likewise.
(empty_word_instance, empty_word_instance_): New method and static
member.
* src/ltlast/formula.hh (formula::formula): If max_count_ ever
loops, skip the first three values so that constants always have
smaller hash codes.
* src/ltlast/binop.hh, src/ltlast/binop.cc (instance): Add
simplifications and document them.
* src/ltlast/multop.hh (multop::Concat): New operator.
* src/ltlast/multop.cc (op_name): Handle Concat.
(instance): Inline Concat arguments without reordering.  Handle
absorbent and neutral elements for all operators.
* src/ltlast/unop.hh (unop::Star): New operator.
* src/ltlast/unop.cc (op_name): Handle Star.
(instance): Handle Star, and add trivial simplifications for
other unary operators.
* src/ltlparse/ltlparse.yy (OP_CONCAT, OP_STAR, CONST_EMPTYWORD):
Declare these new operators and add rules for them.
* src/ltlparse/ltlscan.ll (OP_CONCAT, OP_STAR, CONST_EMPTYWORD):
Output these new operators.
* src/ltltest/equals.test: New tests.
* src/ltltest/parse.test: Remove redundant test.
* src/ltltest/tunabbrev.test, src/tgbatest/emptchk.test: Adjust tests.
* src/ltlvisit/basicreduce.cc, src/ltlvisit/contain.cc,
src/ltlvisit/nenoform.cc, src/ltlvisit/reduce.cc,
src/ltlvisit/syntimpl.cc, src/ltlvisit/tostring.cc,
src/ltlvisit/tunabbrev.cc: Complete visitors to handle new
operators.
* src/ltltest/nenoform.test: More tests.
* src/ltlvisit/lunabbrev.cc (unabbreviate_logic_visitor::visit):
Clone formulae before instance() function actually have a chance
to destroy them.
* src/tgba/formula2bdd.cc, src/tgbaalgos/eltl2tgba_lacim.cc,
src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/ltl2tgba_lacim.cc: Adjust switches to assert on new
operators.
This commit is contained in:
Alexandre Duret-Lutz 2010-01-11 14:29:46 +01:00
parent 4fcc4f829c
commit 546559b8c3
29 changed files with 575 additions and 120 deletions
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9
src/ltltest/nenoform.test
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@ -1,8 +1,8 @@
#! /bin/sh
# Copyright (C) 2009 Laboratoire de Recherche et Développement
# Copyright (C) 2009, 2010 Laboratoire de Recherche et Développement
# de l'Epita (LRDE).
# Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
# département Systèmes Répartis Coopératifs (SRC), Université Pierre
# d<EFBFBD>partement Syst<73>mes R<>partis Coop<6F>ratifs (SRC), Universit<69> Pierre
# et Marie Curie.
#
# This file is part of Spot, a model checking library.
@ -66,3 +66,8 @@ run 0 ../nenoform '!(a | b | c | d)' '!a & !b & !c & !d'
run 0 ../nenoform '!(a U (!b U ((a & b & c) R d)))' \
'!a R (b R ((!a | !b | !c) U !d))'
run 0 ../nenoform '!(GF a => FG b)' 'GFa & GF!b'
# Rational operators
run 0 ../nenoform '!(X((!Xa)*))' 'X!((X!a)*)'
run 0 ../nenoform 'X((Xa)*)' 'X((Xa)*)'
run 0 ../nenoform '!F!X!(GF(a);!FG(a);x)' 'GX!(GFa;GF!a;x)'