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/********************* -*- C++ -*- */
/** expr_value.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.
**
** An expression node.
**
** Instances of this class are generally referenced through
** cvc4::Expr rather than by pointer; cvc4::Expr maintains the
** reference count on ExprValue instances and
**/
#include "expr_value.h"
namespace CVC4 {
ExprValue::ExprValue() :
d_id(0), d_rc(MAX_RC), d_kind(NULL_EXPR), d_nchildren(0) {
}
size_t ExprValue::next_id = 1;
uint64_t ExprValue::hash() const {
uint64_t hash = d_kind;
for(const_iterator i = begin(); i != end(); ++i)
hash = ((hash << 3) | ((hash & 0xE000000000000000ull) >> 61)) ^ i->hash();
return hash;
}
ExprValue* ExprValue::inc() {
// FIXME multithreading
if(d_rc < MAX_RC)
++d_rc;
return this;
}
ExprValue* ExprValue::dec() {
// FIXME multithreading
if(d_rc < MAX_RC)
if(--d_rc == 0) {
// FIXME gc
return 0;
}
return this;
}
ExprValue::iterator ExprValue::begin() {
return d_children;
}
ExprValue::iterator ExprValue::end() {
return d_children + d_nchildren;
}
ExprValue::iterator ExprValue::rbegin() {
return d_children + d_nchildren - 1;
}
ExprValue::iterator ExprValue::rend() {
return d_children - 1;
}
ExprValue::const_iterator ExprValue::begin() const {
return d_children;
}
ExprValue::const_iterator ExprValue::end() const {
return d_children + d_nchildren;
}
ExprValue::const_iterator ExprValue::rbegin() const {
return d_children + d_nchildren - 1;
}
ExprValue::const_iterator ExprValue::rend() const {
return d_children - 1;
}
}/* CVC4 namespace */
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