| /* |
| * @(#)$Id$ |
| * |
| * 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 |
| * @author Erwin Bolwidt <ejb@klomp.org> |
| * @author John Howard <JohnH@schemasoft.com> |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.ReferenceType; |
| |
| import org.apache.bcel.generic.Instruction; |
| import org.apache.bcel.generic.*; |
| import org.apache.bcel.classfile.Field; |
| |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| final class Param extends VariableBase { |
| |
| /** |
| * Display variable as single string |
| */ |
| public String toString() { |
| return("param("+_name+")"); |
| } |
| |
| /** |
| * Display variable in a full AST dump |
| */ |
| public void display(int indent) { |
| indent(indent); |
| System.out.println("param " + _name); |
| if (_select != null) { |
| indent(indent + IndentIncrement); |
| System.out.println("select " + _select.toString()); |
| } |
| displayContents(indent + IndentIncrement); |
| } |
| |
| /** |
| * Parse the contents of the <xsl:param> element. This method must read |
| * the 'name' (required) and 'select' (optional) attributes. |
| */ |
| public void parseContents(Parser parser) { |
| |
| // Parse 'name' and 'select' attributes plus parameter contents |
| super.parseContents(parser); |
| |
| // Add a ref to this param to its enclosing construct |
| final SyntaxTreeNode parent = getParent(); |
| if (parent instanceof Stylesheet) { |
| // Mark this as a global parameter |
| _isLocal = false; |
| // Check if a global variable with this name already exists... |
| Param param = parser.getSymbolTable().lookupParam(_name); |
| // ...and if it does we need to check import precedence |
| if (param != null) { |
| final int us = this.getImportPrecedence(); |
| final int them = param.getImportPrecedence(); |
| // It is an error if the two have the same import precedence |
| if (us == them) { |
| final String name = _name.toString(); |
| reportError(this, parser, ErrorMsg.VARIABLE_REDEF_ERR,name); |
| } |
| // Ignore this if previous definition has higher precedence |
| else if (them > us) { |
| _ignore = true; |
| return; |
| } |
| else { |
| param.disable(); |
| } |
| } |
| // Add this variable if we have higher precedence |
| ((Stylesheet)parent).addParam(this); |
| parser.getSymbolTable().addParam(this); |
| } |
| else if (parent instanceof Template) { |
| _isLocal = true; |
| ((Template)parent).hasParams(true); |
| } |
| } |
| |
| /** |
| * Type-checks the parameter. The parameter type is determined by the |
| * 'select' expression (if present) or is a result tree if the parameter |
| * element has a body and no 'select' expression. |
| */ |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (_select != null) { |
| _type = _select.typeCheck(stable); |
| if (_type instanceof ReferenceType == false) { |
| _select = new CastExpr(_select, Type.Reference); |
| } |
| } |
| else if (hasContents()) { |
| typeCheckContents(stable); |
| } |
| _type = Type.Reference; |
| |
| // This element has no type (the parameter does, but the parameter |
| // element itself does not). |
| return Type.Void; |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| if (_ignore) return; |
| _ignore = true; |
| |
| final String name = getVariable(); |
| final String signature = _type.toSignature(); |
| final String className = _type.getClassName(); |
| |
| if (isLocal()) { |
| |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg, name)); |
| translateValue(classGen, methodGen); |
| il.append(new PUSH(cpg, true)); |
| |
| // Call addParameter() from this class |
| il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS, |
| ADD_PARAMETER, |
| ADD_PARAMETER_SIG))); |
| if (className != EMPTYSTRING) { |
| il.append(new CHECKCAST(cpg.addClass(className))); |
| } |
| |
| _type.translateUnBox(classGen, methodGen); |
| |
| if (_refs.isEmpty()) { // nobody uses the value |
| il.append(_type.POP()); |
| _local = null; |
| } |
| else { // normal case |
| _local = methodGen.addLocalVariable2(name, |
| _type.toJCType(), |
| il.getEnd()); |
| // Cache the result of addParameter() in a local variable |
| il.append(_type.STORE(_local.getIndex())); |
| } |
| } |
| else { |
| if (classGen.containsField(name) == null) { |
| classGen.addField(new Field(ACC_PUBLIC, cpg.addUtf8(name), |
| cpg.addUtf8(signature), |
| null, cpg.getConstantPool())); |
| il.append(classGen.loadTranslet()); |
| il.append(DUP); |
| il.append(new PUSH(cpg, name)); |
| translateValue(classGen, methodGen); |
| il.append(new PUSH(cpg, true)); |
| |
| // Call addParameter() from this class |
| il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS, |
| ADD_PARAMETER, |
| ADD_PARAMETER_SIG))); |
| |
| _type.translateUnBox(classGen, methodGen); |
| |
| // Cache the result of addParameter() in a field |
| if (className != EMPTYSTRING) { |
| il.append(new CHECKCAST(cpg.addClass(className))); |
| } |
| il.append(new PUTFIELD(cpg.addFieldref(classGen.getClassName(), |
| name, signature))); |
| } |
| } |
| } |
| |
| } |