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/********************* -*- C++ -*- */
/** expr_value.h
** 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::Node rather than by pointer; cvc4::Node maintains the
** reference count on ExprValue instances and
**/
/* this must be above the check for __CVC4__EXPR__EXPR_VALUE_H */
/* to resolve a circular dependency */
#include "expr/node.h"
#ifndef __CVC4__EXPR__EXPR_VALUE_H
#define __CVC4__EXPR__EXPR_VALUE_H
#include "cvc4_config.h"
#include <stdint.h>
#include "kind.h"
#include <string>
namespace CVC4 {
class Node;
class NodeBuilder;
namespace expr {
/**
* This is an ExprValue.
*/
class ExprValue {
/** A convenient null-valued expression value */
static ExprValue s_null;
/** Maximum reference count possible. Used for sticky
* reference-counting. Should be (1 << num_bits(d_rc)) - 1 */
static const unsigned MAX_RC = 255;
// this header fits into one 64-bit word
/** The ID (0 is reserved for the null value) */
unsigned d_id : 32;
/** The expression's reference count. @see cvc4::Node. */
unsigned d_rc : 8;
/** Kind of the expression */
unsigned d_kind : 8;
/** Number of children */
unsigned d_nchildren : 16;
/** Variable number of child nodes */
Node d_children[0];
// todo add exprMgr ref in debug case
friend class CVC4::Node;
friend class CVC4::NodeBuilder;
ExprValue* inc();
ExprValue* dec();
static size_t next_id;
/** Private default constructor for the null value. */
ExprValue();
/**
* Computes the hash over the given iterator span of children, and the
* root hash. The iterator should be either over a range of Node or pointers
* to ExprValue.
* @param hash the initial value for the hash
* @param begin the begining of the range
* @param end the end of the range
* @return the hash value
*/
template<typename const_iterator_type>
static uint64_t computeHash(uint64_t hash, const_iterator_type begin, const_iterator_type end) {
for(const_iterator_type i = begin; i != end; ++i)
hash = ((hash << 3) | ((hash & 0xE000000000000000ull) >> 61)) ^ (*i)->getId();
return hash;
}
public:
/** Hash this expression.
* @return the hash value of this expression. */
uint64_t hash() const;
// Iterator support
typedef Node* iterator;
typedef Node const* const_iterator;
iterator begin();
iterator end();
iterator rbegin();
iterator rend();
const_iterator begin() const;
const_iterator end() const;
const_iterator rbegin() const;
const_iterator rend() const;
unsigned getId() const { return d_id; }
unsigned getKind() const { return (Kind) d_kind; }
std::string toString() const;
void toStream(std::ostream& out) const;
};
}/* CVC4::expr namespace */
}/* CVC4 namespace */
#endif /* __CVC4__EXPR__EXPR_VALUE_H */
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