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/********************* */
/** node_value.h
** Original author: mdeters
** Major contributors: dejan
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 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 NodeValue instances and
**/
/* this must be above the check for __CVC4__EXPR__NODE_VALUE_H */
/* to resolve a circular dependency */
//#include "expr/node.h"
#ifndef __CVC4__EXPR__NODE_VALUE_H
#define __CVC4__EXPR__NODE_VALUE_H
#include "cvc4_config.h"
#include <stdint.h>
#include "kind.h"
#include <string>
#include <iterator>
namespace CVC4 {
template <bool ref_count> class NodeTemplate;
template <unsigned> class NodeBuilder;
class NodeManager;
namespace expr {
/**
* This is an NodeValue.
*/
class NodeValue {
/** A convenient null-valued expression value */
static NodeValue 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;
/** Number of bits assigned to the kind in the NodeValue header */
static const unsigned KINDBITS = 8;
/** A mask for d_kind */
static const unsigned kindMask = (1u << KINDBITS) - 1;
// 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 : KINDBITS;
/** Number of children */
unsigned d_nchildren : 16;
/** Variable number of child nodes */
NodeValue *d_children[0];
// todo add exprMgr ref in debug case
template <bool> friend class CVC4::NodeTemplate;
template <unsigned> friend class CVC4::NodeBuilder;
friend class CVC4::NodeManager;
void inc();
void dec();
static size_t next_id;
/** Private default constructor for the null value. */
NodeValue();
/** Private default constructor for the NodeBuilder. */
NodeValue(int);
/** Destructor decrements the ref counts of its children */
~NodeValue();
typedef NodeValue** nv_iterator;
typedef NodeValue const* const* const_nv_iterator;
nv_iterator nv_begin();
nv_iterator nv_end();
const_nv_iterator nv_begin() const;
const_nv_iterator nv_end() const;
template <bool ref_count>
class iterator {
const_nv_iterator d_i;
public:
explicit iterator(const_nv_iterator i) : d_i(i) {}
inline CVC4::NodeTemplate<ref_count> operator*();
bool operator==(const iterator& i) {
return d_i == i.d_i;
}
bool operator!=(const iterator& i) {
return d_i != i.d_i;
}
iterator operator++() {
++d_i;
return *this;
}
iterator operator++(int) {
return iterator(d_i++);
}
typedef std::input_iterator_tag iterator_category;
};
public:
template <bool ref_count>
iterator<ref_count> begin() const {
return iterator<ref_count>(d_children);
}
template <bool ref_count>
iterator<ref_count> end() const {
return iterator<ref_count>(d_children + d_nchildren);
}
/**
* Hash this expression.
* @return the hash value of this expression.
*/
size_t hash() const {
size_t hash = d_kind;
const_nv_iterator i = nv_begin();
const_nv_iterator i_end = nv_end();
while (i != i_end) {
hash ^= (*i)->d_id + 0x9e3779b9 + (hash << 6) + (hash >> 2);
++ i;
}
return hash;
}
inline bool compareTo(const NodeValue* nv) const {
if(d_kind != nv->d_kind)
return false;
if(d_nchildren != nv->d_nchildren)
return false;
const_nv_iterator i = nv_begin();
const_nv_iterator j = nv->nv_begin();
const_nv_iterator i_end = nv_end();
while(i != i_end) {
if ((*i) != (*j)) return false;
++i; ++j;
}
return true;
}
// Comparison predicate
struct NodeValueEq {
bool operator()(const NodeValue* nv1, const NodeValue* nv2) const {
return nv1->compareTo(nv2);
}
};
unsigned getId() const { return d_id; }
Kind getKind() const { return dKindToKind(d_kind); }
unsigned getNumChildren() const { return d_nchildren; }
std::string toString() const;
void toStream(std::ostream& out) const;
static inline unsigned kindToDKind(Kind k) {
return ((unsigned) k) & kindMask;
}
static inline Kind dKindToKind(unsigned d) {
return (d == kindMask) ? UNDEFINED_KIND : Kind(d);
}
};
}/* CVC4::expr namespace */
}/* CVC4 namespace */
#include "expr/node.h"
namespace CVC4 {
namespace expr {
template <bool ref_count>
inline CVC4::NodeTemplate<ref_count> NodeValue::iterator<ref_count>::operator*() {
return NodeTemplate<ref_count>(*d_i);
}
}/* CVC4::expr namespace */
}/* CVC4 namespace */
#endif /* __CVC4__EXPR__NODE_VALUE_H */
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