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// Maria structure component reference expression class -*- c++ -*-
#ifdef __GNUC__
# pragma implementation
#endif // __GNUC__
#include "StructComponent.h"
#include "StructType.h"
#include "StructValue.h"
#include "Printer.h"
/** @file StructComponent.C
* Structure component reference
*/
/* Copyright 1999-2002 Marko Mkel (msmakela@tcs.hut.fi).
This file is part of MARIA, a reachability analyzer and model checker
for high-level Petri nets.
MARIA is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
MARIA is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
StructComponent::StructComponent (class Expression& structure,
card_t i) :
myStructure (&structure), myIndex (i)
{
assert (myStructure && myStructure->getType ()->getKind () == Type::tStruct);
const class StructType* type =
static_cast<const class StructType*>(myStructure->getType ());
assert (myStructure->isBasic ());
setType ((*type)[myIndex]);
}
StructComponent::~StructComponent ()
{
myStructure->destroy ();
}
class Value*
StructComponent::do_eval (const class Valuation& valuation) const
{
class Value* v = myStructure->eval (valuation);
if (!v)
return NULL;
assert (v->getKind () == Value::vStruct);
class Value* u = NULL;
if (const class Value* w = (*static_cast<class StructValue*>(v))[myIndex])
u = w->copy ();
delete v;
return u;
}
class Expression*
StructComponent::ground (const class Valuation& valuation,
class Transition* transition,
bool declare)
{
class Expression* structure =
myStructure->ground (valuation, transition, declare);
if (!structure)
return NULL;
assert (valuation.isOK ());
if (structure == myStructure) {
structure->destroy ();
return copy ();
}
else
return static_cast<class Expression*>
(new class StructComponent (*structure, myIndex))->ground (valuation);
}
class Expression*
StructComponent::substitute (class Substitution& substitution)
{
class Expression* structure = myStructure->substitute (substitution);
if (structure == myStructure) {
structure->destroy ();
return copy ();
}
else
return (new class StructComponent (*structure, myIndex))->cse ();
}
bool
StructComponent::depends (const class VariableSet& vars,
bool complement) const
{
return myStructure->depends (vars, complement);
}
bool
StructComponent::forExpressions (bool (*operation)
(const class Expression&,void*),
void* data) const
{
return
(*operation) (*this, data) &&
myStructure->forExpressions (operation, data);
}
#ifdef EXPR_COMPILE
# include "CExpression.h"
void
StructComponent::compile (class CExpression& cexpr,
unsigned indent,
const char* lvalue,
const class VariableSet* vars) const
{
char* rvalue = 0;
class StringBuffer& out = cexpr.getOut ();
if (cexpr.getVariable (*myStructure, rvalue))
myStructure->compile (cexpr, indent, rvalue, vars);
out.indent (indent);
out.append (lvalue);
out.append ("=");
out.append (rvalue);
out.append (".s");
out.append (myIndex);
out.append (";\n");
delete[] rvalue;
}
#endif // EXPR_COMPILE
/** Determine whether an expression needs to be enclosed in parentheses
* @param kind kind of the expression
* @return whether parentheses are necessary
*/
inline static bool
needParentheses (enum Expression::Kind kind)
{
switch (kind) {
case Expression::eVariable:
case Expression::eUndefined:
case Expression::eStructComponent:
case Expression::eUnionComponent:
case Expression::eVectorIndex:
return false;
case Expression::eCardinality:
case Expression::eUnionType:
case Expression::eUnion:
case Expression::eVector:
case Expression::eBinop:
case Expression::eBooleanBinop:
case Expression::eNot:
case Expression::eRelop:
case Expression::eBuffer:
case Expression::eBufferRemove:
case Expression::eBufferWrite:
case Expression::eBufferIndex:
case Expression::eSet:
case Expression::eTemporalBinop:
case Expression::eTemporalUnop:
case Expression::eMarking:
case Expression::eTransitionQualifier:
case Expression::ePlaceContents:
case Expression::eSubmarking:
case Expression::eMapping:
case Expression::eEmptySet:
case Expression::eVectorAssign:
case Expression::eVectorShift:
assert (false);
case Expression::eUnop:
case Expression::eConstant:
case Expression::eStruct:
case Expression::eStructAssign:
case Expression::eIfThenElse:
case Expression::eBufferUnop:
case Expression::eTypecast:
break;
}
return true;
}
void
StructComponent::display (const class Printer& printer) const
{
if (::needParentheses (myStructure->getKind ())) {
printer.delimiter ('(')++;
myStructure->display (printer);
--printer.delimiter (')');
}
else
myStructure->display (printer);
printer.delimiter ('.');
printer.print (static_cast<const class StructType*>(myStructure->getType ())
->getComponentName (myIndex));
}
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