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/********************* */
/*! \file node.cpp
** \verbatim
** Top contributors (to current version):
** Morgan Deters, Tim King, Dejan Jovanovic
** This file is part of the CVC4 project.
** Copyright (c) 2009-2016 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Reference-counted encapsulation of a pointer to node information.
**
** Reference-counted encapsulation of a pointer to node information.
**/
#include "expr/node.h"
#include <iostream>
#include <cstring>
#include "base/exception.h"
#include "base/output.h"
#include "expr/attribute.h"
using namespace std;
namespace CVC4 {
TypeCheckingExceptionPrivate::TypeCheckingExceptionPrivate(TNode node,
std::string message) throw() :
Exception(message),
d_node(new Node(node)) {
#ifdef CVC4_DEBUG
LastExceptionBuffer* current = LastExceptionBuffer::getCurrent();
if(current != NULL){
current->setContents(toString().c_str());
}
#endif /* CVC4_DEBUG */
}
TypeCheckingExceptionPrivate::~TypeCheckingExceptionPrivate() throw () {
delete d_node;
}
void TypeCheckingExceptionPrivate::toStream(std::ostream& os) const throw() {
os << "Error during type checking: " << d_msg << std::endl << *d_node << endl << "The ill-typed expression: " << *d_node;
}
NodeTemplate<true> TypeCheckingExceptionPrivate::getNode() const throw() {
return *d_node;
}
UnknownTypeException::UnknownTypeException(TNode n) throw() :
TypeCheckingExceptionPrivate(n, "this expression contains an element of unknown type (such as an abstract value);"
" its type cannot be computed until it is substituted away") {
}
/** Is this node constant? (and has that been computed yet?) */
struct IsConstTag { };
struct IsConstComputedTag { };
struct HasBoundVarTag { };
struct HasBoundVarComputedTag { };
typedef expr::Attribute<IsConstTag, bool> IsConstAttr;
typedef expr::Attribute<IsConstComputedTag, bool> IsConstComputedAttr;
/** Attribute true for expressions with bound variables in them */
typedef expr::Attribute<HasBoundVarTag, bool> HasBoundVarAttr;
typedef expr::Attribute<HasBoundVarComputedTag, bool> HasBoundVarComputedAttr;
template <bool ref_count>
bool NodeTemplate<ref_count>::isConst() const {
assertTNodeNotExpired();
Debug("isConst") << "Node::isConst() for: " << *this << std::endl;
if(isNull()) {
return false;
}
switch(getMetaKind()) {
case kind::metakind::CONSTANT:
Debug("isConst") << "Node::isConst() returning true, it's a CONSTANT" << std::endl;
return true;
case kind::metakind::VARIABLE:
Debug("isConst") << "Node::isConst() returning false, it's a VARIABLE" << std::endl;
return false;
default:
if(expr::TypeChecker::neverIsConst(NodeManager::currentNM(), *this)){
Debug("isConst") << "Node::isConst() returning false, the kind is never const" << std::endl;
return false;
}
if(getAttribute(IsConstComputedAttr())) {
bool bval = getAttribute(IsConstAttr());
Debug("isConst") << "Node::isConst() returning cached value " << (bval ? "true" : "false") << " for: " << *this << std::endl;
return bval;
} else {
bool bval = expr::TypeChecker::computeIsConst(NodeManager::currentNM(), *this);
Debug("isConst") << "Node::isConst() computed value " << (bval ? "true" : "false") << " for: " << *this << std::endl;
const_cast< NodeTemplate<ref_count>* >(this)->setAttribute(IsConstAttr(), bval);
const_cast< NodeTemplate<ref_count>* >(this)->setAttribute(IsConstComputedAttr(), true);
return bval;
}
}
}
template <bool ref_count>
bool NodeTemplate<ref_count>::hasBoundVar() {
assertTNodeNotExpired();
if(! getAttribute(HasBoundVarComputedAttr())) {
bool hasBv = false;
if(getKind() == kind::BOUND_VARIABLE) {
hasBv = true;
} else {
for(iterator i = begin(); i != end() && !hasBv; ++i) {
hasBv = (*i).hasBoundVar();
}
}
setAttribute(HasBoundVarAttr(), hasBv);
setAttribute(HasBoundVarComputedAttr(), true);
Debug("bva") << *this << " has bva : " << getAttribute(HasBoundVarAttr()) << std::endl;
return hasBv;
}
return getAttribute(HasBoundVarAttr());
}
template bool NodeTemplate<true>::isConst() const;
template bool NodeTemplate<false>::isConst() const;
template bool NodeTemplate<true>::hasBoundVar();
template bool NodeTemplate<false>::hasBoundVar();
}/* CVC4 namespace */
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