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/********************* -*- C++ -*- */
/** expr_builder.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.
**
**/
#ifndef __CVC4__EXPR_BUILDER_H
#define __CVC4__EXPR_BUILDER_H
#include <vector>
#include <cstdlib>
#include "expr_manager.h"
#include "kind.h"
namespace CVC4 {
class AndExprBuilder;
class OrExprBuilder;
class PlusExprBuilder;
class MinusExprBuilder;
class MultExprBuilder;
class ExprBuilder {
ExprManager* d_em;
Kind d_kind;
// initially false, when you extract the Expr this is set and you can't
// extract another
bool d_used;
static const unsigned nchild_thresh = 10;
unsigned d_nchildren;
union {
ExprValue* u_arr[nchild_thresh];
std::vector<Expr>* u_vec;
} d_children;
void addChild(const Expr&);
void addChild(ExprValue*);
ExprBuilder& collapse();
typedef ExprValue** ev_iterator;
typedef ExprValue const** const_ev_iterator;
ev_iterator ev_begin() {
return d_children.u_arr;
}
ev_iterator ev_end() {
return d_children.u_arr + d_nchildren;
}
ExprBuilder& reset(const ExprValue*);
public:
ExprBuilder();
ExprBuilder(Kind k);
ExprBuilder(const Expr&);
ExprBuilder(const ExprBuilder&);
ExprBuilder(ExprManager*);
ExprBuilder(ExprManager*, Kind k);
ExprBuilder(ExprManager*, const Expr&);
ExprBuilder(ExprManager*, const ExprBuilder&);
~ExprBuilder();
// Compound expression constructors
ExprBuilder& eqExpr(const Expr& right);
ExprBuilder& notExpr();
ExprBuilder& negate(); // avoid double-negatives
ExprBuilder& andExpr(const Expr& right);
ExprBuilder& orExpr(const Expr& right);
ExprBuilder& iteExpr(const Expr& thenpart, const Expr& elsepart);
ExprBuilder& iffExpr(const Expr& right);
ExprBuilder& impExpr(const Expr& right);
ExprBuilder& xorExpr(const Expr& right);
/* TODO design: these modify ExprBuilder */
ExprBuilder& operator!() { return notExpr(); }
ExprBuilder& operator&&(const Expr& right) { return andExpr(right); }
ExprBuilder& operator||(const Expr& right) { return orExpr(right); }
// "Stream" expression constructor syntax
ExprBuilder& operator<<(const Kind& op);
ExprBuilder& operator<<(const Expr& child);
// For pushing sequences of children
ExprBuilder& append(const std::vector<Expr>& children) { return append(children.begin(), children.end()); }
ExprBuilder& append(Expr child) { return append(&child, (&child) + 1); }
template <class Iterator> ExprBuilder& append(const Iterator& begin, const Iterator& end);
operator Expr();// not const
AndExprBuilder operator&&(Expr);
OrExprBuilder operator||(Expr);
PlusExprBuilder operator+ (Expr);
PlusExprBuilder operator- (Expr);
MultExprBuilder operator* (Expr);
friend class AndExprBuilder;
friend class OrExprBuilder;
friend class PlusExprBuilder;
friend class MultExprBuilder;
};/* class ExprBuilder */
class AndExprBuilder {
ExprBuilder d_eb;
public:
AndExprBuilder(const ExprBuilder& eb) : d_eb(eb) {
if(d_eb.d_kind != AND) {
d_eb.collapse();
d_eb.d_kind = AND;
}
}
AndExprBuilder& operator&&(Expr);
OrExprBuilder operator||(Expr);
operator ExprBuilder() { return d_eb; }
};/* class AndExprBuilder */
class OrExprBuilder {
ExprBuilder d_eb;
public:
OrExprBuilder(const ExprBuilder& eb) : d_eb(eb) {
if(d_eb.d_kind != OR) {
d_eb.collapse();
d_eb.d_kind = OR;
}
}
AndExprBuilder operator&&(Expr);
OrExprBuilder& operator||(Expr);
operator ExprBuilder() { return d_eb; }
};/* class OrExprBuilder */
class PlusExprBuilder {
ExprBuilder d_eb;
public:
PlusExprBuilder(const ExprBuilder& eb) : d_eb(eb) {
if(d_eb.d_kind != PLUS) {
d_eb.collapse();
d_eb.d_kind = PLUS;
}
}
PlusExprBuilder& operator+(Expr);
PlusExprBuilder& operator-(Expr);
MultExprBuilder operator*(Expr);
operator ExprBuilder() { return d_eb; }
};/* class PlusExprBuilder */
class MultExprBuilder {
ExprBuilder d_eb;
public:
MultExprBuilder(const ExprBuilder& eb) : d_eb(eb) {
if(d_eb.d_kind != MULT) {
d_eb.collapse();
d_eb.d_kind = MULT;
}
}
PlusExprBuilder operator+(Expr);
PlusExprBuilder operator-(Expr);
MultExprBuilder& operator*(Expr);
operator ExprBuilder() { return d_eb; }
};/* class MultExprBuilder */
template <class Iterator>
inline ExprBuilder& ExprBuilder::append(const Iterator& begin, const Iterator& end) {
for(Iterator i = begin; i != end; ++i)
addChild(*i);
return *this;
}
// not const
inline ExprBuilder::operator Expr() {
ExprValue *ev;
uint64_t hash;
// variables are permitted to be duplicates (from POV of the expression manager)
if(d_kind == VARIABLE) {
ev = new ExprValue;
hash = reinterpret_cast<uint64_t>(ev);
} else {
hash = d_kind;
if(d_nchildren <= nchild_thresh) {
for(ev_iterator i = ev_begin(); i != ev_end(); ++i)
hash = ((hash << 3) | ((hash & 0xE000000000000000ull) >> 61)) ^ (*i)->hash();
void *space = std::calloc(1, sizeof(ExprValue) + d_nchildren * sizeof(Expr));
ev = new (space) ExprValue;
size_t nc = 0;
for(ev_iterator i = ev_begin(); i != ev_end(); ++i)
ev->d_children[nc++] = Expr(*i);
} else {
for(std::vector<Expr>::iterator i = d_children.u_vec->begin(); i != d_children.u_vec->end(); ++i)
hash = ((hash << 3) | ((hash & 0xE000000000000000ull) >> 61)) ^ (*i)->hash();
void *space = std::calloc(1, sizeof(ExprValue) + d_nchildren * sizeof(Expr));
ev = new (space) ExprValue;
size_t nc = 0;
for(std::vector<Expr>::iterator i = d_children.u_vec->begin(); i != d_children.u_vec->end(); ++i)
ev->d_children[nc++] = Expr(*i);
}
}
ev->d_nchildren = d_nchildren;
ev->d_kind = d_kind;
ev->d_id = ExprValue::next_id++;// FIXME multithreading
ev->d_rc = 0;
Expr e(ev);
return d_em->lookup(hash, e);
}
inline AndExprBuilder ExprBuilder::operator&&(Expr e) {
return AndExprBuilder(*this) && e;
}
inline OrExprBuilder ExprBuilder::operator||(Expr e) {
return OrExprBuilder(*this) || e;
}
inline PlusExprBuilder ExprBuilder::operator+ (Expr e) {
return PlusExprBuilder(*this) + e;
}
inline PlusExprBuilder ExprBuilder::operator- (Expr e) {
return PlusExprBuilder(*this) - e;
}
inline MultExprBuilder ExprBuilder::operator* (Expr e) {
return MultExprBuilder(*this) * e;
}
inline AndExprBuilder& AndExprBuilder::operator&&(Expr e) {
d_eb.append(e);
return *this;
}
inline OrExprBuilder AndExprBuilder::operator||(Expr e) {
return OrExprBuilder(d_eb.collapse()) || e;
}
inline AndExprBuilder OrExprBuilder::operator&&(Expr e) {
return AndExprBuilder(d_eb.collapse()) && e;
}
inline OrExprBuilder& OrExprBuilder::operator||(Expr e) {
d_eb.append(e);
return *this;
}
inline PlusExprBuilder& PlusExprBuilder::operator+(Expr e) {
d_eb.append(e);
return *this;
}
inline PlusExprBuilder& PlusExprBuilder::operator-(Expr e) {
d_eb.append(e.negate());
return *this;
}
inline MultExprBuilder PlusExprBuilder::operator*(Expr e) {
return MultExprBuilder(d_eb.collapse()) * e;
}
inline PlusExprBuilder MultExprBuilder::operator+(Expr e) {
return MultExprBuilder(d_eb.collapse()) + e;
}
inline PlusExprBuilder MultExprBuilder::operator-(Expr e) {
return MultExprBuilder(d_eb.collapse()) - e;
}
inline MultExprBuilder& MultExprBuilder::operator*(Expr e) {
d_eb.append(e);
return *this;
}
}/* CVC4 namespace */
#endif /* __CVC4__EXPR_BUILDER_H */
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