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/********************* -*- C++ -*- */
/** node.cpp
** This file is part of the CVC4 prototype.
** Copyright (c) 2009 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.
**
** Reference-counted encapsulation of a pointer to an expression.
**/
#include "expr/node.h"
#include "expr/node_value.h"
#include "expr/node_builder.h"
#include "util/Assert.h"
#include <sstream>
using namespace CVC4::expr;
using namespace std;
namespace CVC4 {
NodeValue NodeValue::s_null;
Node Node::s_null(&NodeValue::s_null);
Node Node::null() {
return s_null;
}
bool Node::isNull() const {
return d_ev == &NodeValue::s_null;
}
Node::Node() :
d_ev(&NodeValue::s_null) {
// No refcount needed
}
// FIXME: escape from type system convenient but is there a better
// way? Nodes conceptually don't change their expr values but of
// course they do modify the refcount. But it's nice to be able to
// support node_iterators over const NodeValue*. So.... hm.
Node::Node(const NodeValue* ev)
: d_ev(const_cast<NodeValue*>(ev)) {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev->inc();
}
Node::Node(const Node& e) {
Assert(e.d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev = e.d_ev;
d_ev->inc();
}
Node::~Node() {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev->dec();
}
void Node::assignNodeValue(NodeValue* ev) {
d_ev = ev;
d_ev->inc();
}
Node& Node::operator=(const Node& e) {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
Assert(e.d_ev != NULL, "Expecting a non-NULL expression value on RHS!");
if(EXPECT_TRUE( d_ev != e.d_ev )) {
d_ev->dec();
d_ev = e.d_ev;
d_ev->inc();
}
return *this;
}
NodeValue const* Node::operator->() const {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
return d_ev;
}
uint64_t Node::hash() const {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
return d_ev->hash();
}
Node Node::eqExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(EQUAL, *this, right);
}
Node Node::notExpr() const {
return NodeManager::currentNM()->mkNode(NOT, *this);
}
Node Node::andExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(AND, *this, right);
}
Node Node::orExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(OR, *this, right);
}
Node Node::iteExpr(const Node& thenpart, const Node& elsepart) const {
return NodeManager::currentNM()->mkNode(ITE, *this, thenpart, elsepart);
}
Node Node::iffExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(IFF, *this, right);
}
Node Node::impExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(IMPLIES, *this, right);
}
Node Node::xorExpr(const Node& right) const {
return NodeManager::currentNM()->mkNode(XOR, *this, right);
}
}/* CVC4 namespace */
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