• Alexandre Duret-Lutz's avatar
    Massage the AST so that identical sub-formula share the same · 5f6d8b62
    Alexandre Duret-Lutz authored
    reference-counted formula*.  One can't call constructors for AST
    items anymore, everything need to be acquired through instance()
    class methods.
    
    * src/ltlast/formula.cc, src/ltlast/refformula.cc,
    src/ltlast/refformula.hh: New files.
    * src/ltlast/Makefile.am (libltlast_la_SOURCES): Add them.
    * src/ltlast/atomic_prop.cc, src/ltlast/atomic_prop.hh,
    src/ltlast/unop.cc, src/ltlast/unop.hh,
    src/ltlast/binop.cc, src/ltlast/binop.hh: Make the constructor
    and destructor protected.  Define a static function `instance()'
    to get an instance with specific argument.  Use a map called
    `instances' to store all known instances.  Inherit from
    ref_formula.
    * src/ltlast/constant.hh, src/ltlast/constant.cc: Protect
    the constructor and destructor.  Provide the false_instance()
    and true_instance() functions instead.
    * src/formula.hh (ref, unref, ref_, unref_): New methods.
    * src/ltlast/multop.cc, src/ltlast/multop.hh: Protect
    the constructor, destructor, as well as the add() method.
    Provides the instance(), and add() class methods instead.
    Store children_ as a pointer.
    * src/ltlenv/defaultenv.cc (require): Adjust to
    call atomic_prop::instance.
    * src/ltlparse/ltlparse.yy: Adjust to call instance() functions
    instead of constructors.
    * src/ltltest/Makefile.am (LDADD): Tweak library ordering.
    * src/ltlvisit/clone.hh (clone_visitor): Inherit from visitor,
    not const_visitor, and adjust all prototypes appropriately.
    * src/ltlvisit/clone.cc (clone_visitor): Likewise.
    Call ref() or instance() methods instead of copy constructors.
    * src/ltlvisit/equals.cc: Simplify atomic_prop and constant
    cases.
    * src/ltlvisit/lunabbrev.hh, src/ltlvisit/lunabbrev.cc,
    src/ltlvisit/tunabbrev.hh, src/ltlvisit/tunabbrev.cc,
    src/ltlvisit/nenoform.hh, src/ltlvisit/nenoform.cc: Use instance()
    methods instead of constructor.  Make these children of visitor, not
    const_visitor.
    * src/ltltest/readltl.c (main): Do not delete the formula.
    5f6d8b62
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