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/********************* */
/*! \file model_postprocessor.cpp
** \verbatim
** Original author: Morgan Deters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief
**
**
**/
#include "smt/model_postprocessor.h"
#include "smt/boolean_terms.h"
using namespace std;
using namespace CVC4;
using namespace CVC4::smt;
Node ModelPostprocessor::rewriteAs(TNode n, TypeNode asType) {
if(n.getType().isSubtypeOf(asType)) {
// good to go, we have the right type
return n;
}
if(!n.isConst()) {
// we don't handle non-const right now
return n;
}
if(asType.isBoolean()) {
if(n.getType().isBitVector(1u)) {
// type mismatch: should only happen for Boolean-term conversion under
// datatype constructor applications; rewrite from BV(1) back to Boolean
bool tf = (n.getConst<BitVector>().getValue() == 1);
return NodeManager::currentNM()->mkConst(tf);
}
if(n.getType().isDatatype() && n.getType().hasAttribute(BooleanTermAttr())) {
// type mismatch: should only happen for Boolean-term conversion under
// datatype constructor applications; rewrite from datatype back to Boolean
Assert(n.getKind() == kind::APPLY_CONSTRUCTOR);
Assert(n.getNumChildren() == 0);
// we assume (by construction) false is first; see boolean_terms.cpp
bool tf = (Datatype::indexOf(n.getOperator().toExpr()) == 1);
Debug("boolean-terms") << "+++ rewriteAs " << n << " : " << asType << " ==> " << tf << endl;
return NodeManager::currentNM()->mkConst(tf);
}
}
if(n.getType().isBoolean()) {
bool tf = n.getConst<bool>();
if(asType.isBitVector(1u)) {
return NodeManager::currentNM()->mkConst(BitVector(1u, tf ? 1u : 0u));
}
if(asType.isDatatype() && asType.hasAttribute(BooleanTermAttr())) {
const Datatype& asDatatype = asType.getConst<Datatype>();
return NodeManager::currentNM()->mkNode(kind::APPLY_CONSTRUCTOR, (tf ? asDatatype[0] : asDatatype[1]).getConstructor());
}
}
if(n.getType().isRecord() && asType.isRecord()) {
Debug("boolean-terms") << "+++ got a record - rewriteAs " << n << " : " << asType << endl;
const Record& rec CVC4_UNUSED = n.getType().getConst<Record>();
const Record& asRec = asType.getConst<Record>();
Assert(rec.getNumFields() == asRec.getNumFields());
Assert(n.getNumChildren() == asRec.getNumFields());
NodeBuilder<> b(n.getKind());
b << asType;
for(size_t i = 0; i < n.getNumChildren(); ++i) {
b << rewriteAs(n[i], TypeNode::fromType(asRec[i].second));
}
Node out = b;
Debug("boolean-terms") << "+++ returning record " << out << endl;
return out;
}
Debug("boolean-terms") << "+++ rewriteAs " << n << " : " << asType << endl;
if(n.getType().isArray()) {
Assert(asType.isArray());
if(n.getKind() == kind::STORE) {
return NodeManager::currentNM()->mkNode(kind::STORE,
rewriteAs(n[0], asType),
rewriteAs(n[1], asType[0]),
rewriteAs(n[2], asType[1]));
}
Assert(n.getKind() == kind::STORE_ALL);
const ArrayStoreAll& asa = n.getConst<ArrayStoreAll>();
Node val = rewriteAs(asa.getExpr(), asType[1]);
return NodeManager::currentNM()->mkConst(ArrayStoreAll(asType.toType(), val.toExpr()));
}
if(asType.getNumChildren() != n.getNumChildren() ||
n.getMetaKind() == kind::metakind::CONSTANT) {
return n;
}
NodeBuilder<> b(n.getKind());
TypeNode::iterator t = asType.begin();
for(TNode::iterator i = n.begin(); i != n.end(); ++i, ++t) {
Assert(t != asType.end());
b << rewriteAs(*i, *t);
}
Assert(t == asType.end());
Debug("boolean-terms") << "+++ constructing " << b << endl;
Node out = b;
return out;
}
void ModelPostprocessor::visit(TNode current, TNode parent) {
Debug("tuprec") << "visiting " << current << endl;
Assert(!alreadyVisited(current, TNode::null()));
if(current.getType().hasAttribute(expr::DatatypeTupleAttr())) {
Assert(current.getKind() == kind::APPLY_CONSTRUCTOR);
TypeNode expectType = current.getType().getAttribute(expr::DatatypeTupleAttr());
NodeBuilder<> b(kind::TUPLE);
TypeNode::iterator t = expectType.begin();
for(TNode::iterator i = current.begin(); i != current.end(); ++i, ++t) {
Assert(alreadyVisited(*i, TNode::null()));
Assert(t != expectType.end());
TNode n = d_nodes[*i];
n = n.isNull() ? *i : n;
if(!n.getType().isSubtypeOf(*t)) {
Assert(n.getType().isBitVector(1u) ||
(n.getType().isDatatype() && n.getType().hasAttribute(BooleanTermAttr())));
Assert(n.isConst());
Assert((*t).isBoolean());
if(n.getType().isBitVector(1u)) {
b << NodeManager::currentNM()->mkConst(bool(n.getConst<BitVector>().getValue() == 1));
} else {
// we assume (by construction) false is first; see boolean_terms.cpp
b << NodeManager::currentNM()->mkConst(bool(Datatype::indexOf(n.getOperator().toExpr()) == 1));
}
} else {
b << n;
}
}
Assert(t == expectType.end());
d_nodes[current] = b;
Debug("tuprec") << "returning " << d_nodes[current] << endl;
Assert(d_nodes[current].getType() == expectType);
} else if(current.getType().hasAttribute(expr::DatatypeRecordAttr())) {
Assert(current.getKind() == kind::APPLY_CONSTRUCTOR);
TypeNode expectType = current.getType().getAttribute(expr::DatatypeRecordAttr());
const Record& expectRec = expectType.getConst<Record>();
NodeBuilder<> b(kind::RECORD);
b << current.getType().getAttribute(expr::DatatypeRecordAttr());
Record::const_iterator t = expectRec.begin();
for(TNode::iterator i = current.begin(); i != current.end(); ++i, ++t) {
Assert(alreadyVisited(*i, TNode::null()));
Assert(t != expectRec.end());
TNode n = d_nodes[*i];
n = n.isNull() ? *i : n;
if(!n.getType().isSubtypeOf(TypeNode::fromType((*t).second))) {
Assert(n.getType().isBitVector(1u) ||
(n.getType().isDatatype() && n.getType().hasAttribute(BooleanTermAttr())));
Assert(n.isConst());
Assert((*t).second.isBoolean());
if(n.getType().isBitVector(1u)) {
b << NodeManager::currentNM()->mkConst(bool(n.getConst<BitVector>().getValue() == 1));
} else {
// we assume (by construction) false is first; see boolean_terms.cpp
b << NodeManager::currentNM()->mkConst(bool(Datatype::indexOf(n.getOperator().toExpr()) == 1));
}
} else {
b << n;
}
}
Assert(t == expectRec.end());
d_nodes[current] = b;
Debug("tuprec") << "returning " << d_nodes[current] << endl;
Assert(d_nodes[current].getType() == expectType);
} else if(current.getKind() == kind::APPLY_CONSTRUCTOR &&
( current.getOperator().hasAttribute(BooleanTermAttr()) ||
( current.getOperator().getKind() == kind::APPLY_TYPE_ASCRIPTION &&
current.getOperator()[0].hasAttribute(BooleanTermAttr()) ) )) {
NodeBuilder<> b(kind::APPLY_CONSTRUCTOR);
Node realOp;
if(current.getOperator().getKind() == kind::APPLY_TYPE_ASCRIPTION) {
TNode oldAsc = current.getOperator().getOperator();
Debug("boolean-terms") << "old asc: " << oldAsc << endl;
Node newCons = current.getOperator()[0].getAttribute(BooleanTermAttr());
Node newAsc = NodeManager::currentNM()->mkConst(AscriptionType(newCons.getType().toType()));
Debug("boolean-terms") << "new asc: " << newAsc << endl;
if(newCons.getType().getRangeType().isParametricDatatype()) {
vector<TypeNode> oldParams = TypeNode::fromType(oldAsc.getConst<AscriptionType>().getType()).getRangeType().getParamTypes();
vector<TypeNode> newParams = newCons.getType().getRangeType().getParamTypes();
Assert(oldParams.size() == newParams.size() && oldParams.size() > 0);
newAsc = NodeManager::currentNM()->mkConst(AscriptionType(newCons.getType().substitute(newParams.begin(), newParams.end(), oldParams.begin(), oldParams.end()).toType()));
}
realOp = NodeManager::currentNM()->mkNode(kind::APPLY_TYPE_ASCRIPTION, newAsc, newCons);
} else {
realOp = current.getOperator().getAttribute(BooleanTermAttr());
}
b << realOp;
Debug("boolean-terms") << "+ op " << b.getOperator() << endl;
TypeNode::iterator j = realOp.getType().begin();
for(TNode::iterator i = current.begin(); i != current.end(); ++i, ++j) {
Assert(j != realOp.getType().end());
Assert(alreadyVisited(*i, TNode::null()));
TNode repl = d_nodes[*i];
repl = repl.isNull() ? *i : repl;
Debug("boolean-terms") << "+ adding " << repl << " expecting " << *j << endl;
b << rewriteAs(repl, *j);
}
Node n = b;
Debug("boolean-terms") << "model-post: " << current << endl
<< "- returning " << n << endl;
d_nodes[current] = n;
} else {
Debug("tuprec") << "returning self for kind " << current.getKind() << endl;
// rewrite to self
d_nodes[current] = Node::null();
}
}/* ModelPostprocessor::visit() */
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