| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Copyright 2001-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id: Param.java,v 1.2.4.1 2005/09/02 11:03:42 pvedula Exp $ |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import com.sun.org.apache.bcel.internal.classfile.Field; |
| import com.sun.org.apache.bcel.internal.generic.BranchHandle; |
| import com.sun.org.apache.bcel.internal.generic.CHECKCAST; |
| import com.sun.org.apache.bcel.internal.generic.IFNONNULL; |
| import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
| import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; |
| import com.sun.org.apache.bcel.internal.generic.Instruction; |
| import com.sun.org.apache.bcel.internal.generic.InstructionList; |
| import com.sun.org.apache.bcel.internal.generic.PUSH; |
| import com.sun.org.apache.bcel.internal.generic.PUTFIELD; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ReferenceType; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ObjectType; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| * @author Erwin Bolwidt <ejb@klomp.org> |
| * @author John Howard <JohnH@schemasoft.com> |
| */ |
| final class Param extends VariableBase { |
| |
| /** |
| * True if this Param is declared in a simple named template. |
| * This is used to optimize codegen for parameter passing |
| * in named templates. |
| */ |
| private boolean _isInSimpleNamedTemplate = false; |
| |
| /** |
| * Display variable as single string |
| */ |
| public String toString() { |
| return "param(" + _name + ")"; |
| } |
| |
| /** |
| * Set the instruction for loading the value of this variable onto the |
| * JVM stack and returns the old instruction. |
| */ |
| public Instruction setLoadInstruction(Instruction instruction) { |
| Instruction tmp = _loadInstruction; |
| _loadInstruction = instruction; |
| return tmp; |
| } |
| |
| /** |
| * Set the instruction for storing a value from the stack into this |
| * variable and returns the old instruction. |
| */ |
| public Instruction setStoreInstruction(Instruction instruction) { |
| Instruction tmp = _storeInstruction; |
| _storeInstruction = instruction; |
| return tmp; |
| } |
| |
| /** |
| * 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; |
| copyReferences(param); |
| return; |
| } |
| else { |
| param.copyReferences(this); |
| param.disable(); |
| } |
| } |
| // Add this variable if we have higher precedence |
| ((Stylesheet)parent).addParam(this); |
| parser.getSymbolTable().addParam(this); |
| } |
| else if (parent instanceof Template) { |
| Template template = (Template) parent; |
| _isLocal = true; |
| template.addParameter(this); |
| if (template.isSimpleNamedTemplate()) { |
| _isInSimpleNamedTemplate = 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 && !(_type instanceof ObjectType)) { |
| _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; |
| |
| /* |
| * To fix bug 24518 related to setting parameters of the form |
| * {namespaceuri}localName which will get mapped to an instance |
| * variable in the class. |
| */ |
| final String name = BasisLibrary.mapQNameToJavaName(_name.toString()); |
| final String signature = _type.toSignature(); |
| final String className = _type.getClassName(); |
| |
| if (isLocal()) { |
| /* |
| * If simple named template then generate a conditional init of the |
| * param using its default value: |
| * if (param == null) param = <default-value> |
| */ |
| if (_isInSimpleNamedTemplate) { |
| il.append(loadInstruction()); |
| BranchHandle ifBlock = il.append(new IFNONNULL(null)); |
| translateValue(classGen, methodGen); |
| il.append(storeInstruction()); |
| ifBlock.setTarget(il.append(NOP)); |
| return; |
| } |
| |
| 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))); |
| } |
| } |
| } |
| } |
