| /* |
| * @(#)$Id$ |
| * |
| * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved. |
| * |
| * This software is the proprietary information of Sun Microsystems, Inc. |
| * Use is subject to license terms. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * |
| */ |
| |
| package com.sun.xslt.compiler; |
| |
| import java.util.Vector; |
| import com.sun.xml.tree.ElementEx; |
| import com.sun.xslt.compiler.util.Type; |
| import com.sun.xslt.compiler.util.ReferenceType; |
| import de.fub.bytecode.generic.Instruction; |
| import de.fub.bytecode.generic.*; |
| import de.fub.bytecode.classfile.Field; |
| import com.sun.xslt.compiler.util.*; |
| |
| final class Param extends TopLevelElement { |
| private QName _name; |
| private boolean _isLocal; // true if the param is local |
| private Expression _select; |
| private Type _type; |
| // a JavaClass construct to refer to a JVM var |
| private LocalVariableGen _local; |
| // cached JavaClass instruction to push the contents of this var |
| private Instruction _loadInstruction; |
| // references to this variable (when local) |
| private Vector _refs = new Vector(2); |
| // to make sure parameter field is not added twice |
| private boolean _compiled = false; |
| |
| 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); |
| } |
| |
| public void addReference(ParameterRef pref) { |
| System.out.println("GTM> In Param.addReference, param ref = " + pref); |
| _refs.addElement(pref); |
| } |
| |
| public void removeReference(ParameterRef pref) { |
| _refs.remove(pref); |
| } |
| |
| public void removeReference(ParameterRef pref, MethodGenerator methodGen) { |
| System.out.println("GTM> In Param.removeReference, param ref = " + pref); |
| System.out.println("GTM> In Param.removeReference, _refs = " + _refs); |
| _refs.remove(pref); |
| if (_refs.isEmpty()) { |
| _local.setEnd(methodGen.getInstructionList().getEnd()); |
| methodGen.removeLocalVariable(_local); |
| _refs = null; |
| _local = null; |
| } |
| } |
| |
| public Instruction loadInstruction() { |
| final Instruction instr = _loadInstruction; |
| return instr != null |
| ? instr : (_loadInstruction = _type.LOAD(_local.getIndex())); |
| } |
| |
| public Type getType() { |
| return _type; |
| } |
| |
| public boolean isLocal() { |
| return _isLocal; |
| } |
| |
| public QName getName() { |
| return _name; |
| } |
| |
| public void parseContents(ElementEx element, Parser parser) { |
| // Parse attributes name and select (if present) |
| final String name = element.getAttribute("name"); |
| |
| if (name.length() > 0) { |
| _name = parser.getQName(name); |
| } |
| else { |
| reportError(element, parser, ErrorMsg.NREQATTR_ERR, "name"); |
| } |
| |
| // check whether variable/param of the same name is already in scope |
| if (parser.lookupVariable(_name) != null) { |
| ErrorMsg error = new ErrorMsg(ErrorMsg.VARREDEF_ERR, _name, this); |
| parser.addError(error); |
| } |
| |
| final String select = element.getAttribute("select"); |
| if (select.length() > 0) { |
| _select = parser.parseExpression(this, element, "select"); |
| } |
| |
| // Children must be parsed first -> static scoping |
| parseChildren(element, parser); |
| |
| // Add a ref to this param to its enclosing construct |
| final SyntaxTreeNode parent = getParent(); |
| if (parent instanceof Stylesheet) { |
| _isLocal = false; |
| ((Stylesheet)parent).addParam(this); |
| //!! check for redef |
| parser.getSymbolTable().addParam(this); |
| } |
| else { |
| _isLocal = true; |
| parent.addParam(this); |
| } |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| if (_select != null) { |
| final Type tselect = _select.typeCheck(stable); |
| if (tselect instanceof ReferenceType == false) { |
| _select = new CastExpr(_select, Type.Reference); |
| } |
| } |
| else { |
| typeCheckContents(stable); |
| } |
| _type = Type.Reference; |
| return Type.Void; |
| } |
| |
| public void compileResultTree(ClassGenerator classGen, |
| MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| // Save the current handler base on the stack |
| il.append(methodGen.loadHandler()); |
| |
| // Create new instance of DOM class (with 64 nodes) |
| final int init = cpg.addMethodref(DOM_IMPL, "<init>", "(I)V"); |
| il.append(new NEW(cpg.addClass(DOM_IMPL))); |
| il.append(DUP); |
| il.append(DUP); |
| il.append(new PUSH(cpg, 64)); |
| il.append(new INVOKESPECIAL(init)); |
| |
| // Overwrite old handler with DOM handler |
| final int getOutputDomBuilder = |
| cpg.addMethodref(DOM_IMPL, |
| "getOutputDomBuilder", |
| "()" + TRANSLET_OUTPUT_SIG); |
| il.append(new INVOKEVIRTUAL(getOutputDomBuilder)); |
| il.append(DUP); |
| il.append(methodGen.storeHandler()); |
| |
| // Call startDocument on the new handler |
| il.append(methodGen.startDocument()); |
| |
| // Instantiate result tree fragment |
| translateContents(classGen, methodGen); |
| |
| // Call endDocument on the new handler |
| il.append(methodGen.loadHandler()); |
| il.append(methodGen.endDocument()); |
| |
| // Restore old handler base from stack |
| il.append(SWAP); |
| il.append(methodGen.storeHandler()); |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| final String name = _name.getLocalPart(); // TODO: namespace ? |
| |
| if (_compiled) return; |
| _compiled = true; |
| |
| if (isLocal()) { |
| il.append(classGen.loadTranslet()); |
| il.append(new PUSH(cpg, name)); |
| if (_select == null) { |
| if (hasContents()) { |
| compileResultTree(classGen, methodGen); |
| } |
| else { |
| // If no select and no contents push the empty string |
| il.append(new PUSH(cpg, "")); |
| } |
| } |
| else { |
| _select.translate(classGen, methodGen); |
| _select.startResetIterator(classGen, methodGen); |
| } |
| |
| // Call addParameter() from this class |
| final int addParameter = cpg.addMethodref(TRANSLET_CLASS, |
| ADD_PARAMETER, |
| ADD_PARAMETER_SIG); |
| il.append(new INVOKEVIRTUAL(addParameter)); |
| |
| 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 { |
| String signature = _type.toSignature(); |
| if (signature.equals(DOM_IMPL_SIG)) |
| signature = classGen.getDOMClassSig(); |
| 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)); |
| |
| if (_select == null) { |
| if (hasContents()) { |
| compileResultTree(classGen, methodGen); |
| } |
| else { |
| // If no select and no contents push the empty string |
| il.append(new PUSH(cpg, "")); |
| } |
| } |
| else { |
| _select.translate(classGen, methodGen); |
| _select.startResetIterator(classGen, methodGen); |
| } |
| |
| // Call addParameter() from this class |
| il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS, |
| ADD_PARAMETER, |
| ADD_PARAMETER_SIG))); |
| // Cache the result of addParameter() in a field |
| il.append(new PUTFIELD(cpg.addFieldref(classGen.getClassName(), |
| name, signature))); |
| } |
| } |
| } |