/*
* @(#)$Id: LogicalExpr.java,v 1.1 2001/04/17 18:51:35 sboag Exp $
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;
final class LogicalExpr extends Expression {
public static final int OR = 0;
public static final int AND = 1;
private final int _op;
private Expression _left, _right;
private static final String[] Ops = {
"or", "and"
};
public int getOp() {
return(_op);
}
public LogicalExpr(int op, Expression left, Expression right) {
_op = op;
(_left = left).setParent(this);
(_right = right).setParent(this);
}
public void setParser(Parser parser) {
super.setParser(parser);
_left.setParser(parser);
_right.setParser(parser);
}
public String toString() {
return Ops[_op] + '(' + _left + ", " + _right + ')';
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
Type tleft = _left.typeCheck(stable);
Type tright = _right.typeCheck(stable);
MethodType ptype = lookupPrimop(stable,
getParser().getQName(Ops[_op]),
new MethodType(Type.Void,
tleft, tright));
if (ptype != null) {
Type arg1 = (Type) ptype.argsType().elementAt(0);
if (!arg1.identicalTo(tleft)) {
_left = new CastExpr(_left, arg1);
}
Type arg2 = (Type) ptype.argsType().elementAt(1);
if (!arg2.identicalTo(tright)) {
_right = new CastExpr(_right, arg1);
}
return _type = ptype.resultType();
}
throw new TypeCheckError(this);
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
translateDesynthesized(classGen, methodGen);
synthesize(classGen, methodGen);
}
public void translateDesynthesized(ClassGenerator classGen,
MethodGenerator methodGen) {
final InstructionList il = methodGen.getInstructionList();
if (_op == AND) {
_left.translateDesynthesized(classGen, methodGen);
if ((_left instanceof FunctionCall) &&
(!(_left instanceof ContainsCall)))
_falseList.add(il.append(new IFEQ(null)));
_right.translateDesynthesized(classGen, methodGen);
if ((_right instanceof FunctionCall) &&
(!(_right instanceof ContainsCall)))
_falseList.add(il.append(new IFEQ(null)));
_trueList.append(_right._trueList.append(_left._trueList));
_falseList.append(_right._falseList.append(_left._falseList));
}
else { // _op == OR
_left.translateDesynthesized(classGen, methodGen);
if ((_left instanceof FunctionCall) &&
(!(_left instanceof ContainsCall)))
_falseList.add(il.append(new IFEQ(null)));
InstructionHandle ih = il.append(new GOTO(null));
_right.translateDesynthesized(classGen, methodGen);
if ((_right instanceof FunctionCall) &&
(!(_right instanceof ContainsCall)))
_falseList.add(il.append(new IFEQ(null)));
_left._trueList.backPatch(ih);
_left._falseList.backPatch(ih.getNext());
_falseList.append(_right._falseList);
_trueList.add(ih).append(_right._trueList);
}
}
}