| /* |
| * @(#)$Id$ |
| * |
| * 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 |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| 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 VariableRef extends Expression { |
| private final Variable _variable; |
| private boolean _escaped; |
| |
| public VariableRef(Variable variable) { |
| _variable = variable; |
| variable.addReference(this); |
| } |
| |
| public Variable getVariable() { |
| return(_variable); |
| } |
| |
| public String toString() { |
| return "variable-ref(" + _variable.getName() + ')'; |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (_variable.isLocal()) { |
| if (_escaped = isEscaped()) { |
| _variable.setEscapes(); |
| } |
| else { |
| _variable.setUsedLocally(); |
| } |
| } |
| return _type = _variable.getType(); |
| } |
| |
| private boolean isEscaped() { |
| final SyntaxTreeNode limit = _variable.getParent(); |
| SyntaxTreeNode parent = getParent(); |
| do { |
| if (parent.isClosureBoundary()) { |
| return true; |
| } |
| else { |
| parent = parent.getParent(); |
| } |
| } |
| while (parent != limit); |
| return limit.isClosureBoundary(); |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| final Type varType = _variable.getType(); |
| final String varName = _variable.getName().getLocalPart(); |
| |
| if (_variable.isLocal()) { |
| if (varType.implementedAsMethod() == false) { |
| if (classGen.isExternal() || _escaped) { |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg, _variable.getStackIndex())); |
| final int getVar = cpg.addMethodref(TRANSLET_CLASS, |
| GET_VARIABLE, |
| GET_VARIABLE_SIG); |
| il.append(new INVOKEVIRTUAL(getVar)); |
| _type.translateUnBox(classGen, methodGen); |
| } |
| else { |
| il.append(_variable.loadInstruction()); |
| _variable.removeReference(this, methodGen); |
| } |
| } |
| else { |
| // falls through -> result trees + variables |
| } |
| } |
| else { |
| if (varType.implementedAsMethod() == false) { |
| final String className = classGen.getClassName(); |
| String signature = varType.toSignature(); |
| if (signature.equals(DOM_IMPL_SIG)) |
| signature = classGen.getDOMClassSig(); |
| |
| il.append(classGen.loadTranslet()); |
| |
| // If inside a predicate we must cast this ref down |
| if (classGen.isExternal()) { |
| il.append(new CHECKCAST(cpg.addClass(className))); |
| } |
| il.append(new GETFIELD(cpg.addFieldref(className, |
| varName, signature))); |
| } |
| else { |
| // falls through -> result trees + variables |
| } |
| } |
| } |
| } |