1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.xalan.internal.xsltc.compiler; 22 23 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; 24 import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL; 25 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL; 26 import com.sun.org.apache.bcel.internal.generic.Instruction; 27 import com.sun.org.apache.bcel.internal.generic.InstructionList; 28 import com.sun.org.apache.bcel.internal.generic.NEW; 29 import com.sun.org.apache.bcel.internal.generic.PUSH; 30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 34 import java.util.List; 35 36 /** 37 * @author Jacek Ambroziak 38 * @author Santiago Pericas-Geertsen 39 * @LastModified: Oct 2017 40 */ 41 final class ConcatCall extends FunctionCall { ConcatCall(QName fname, List<Expression> arguments)42 public ConcatCall(QName fname, List<Expression> arguments) { 43 super(fname, arguments); 44 } 45 typeCheck(SymbolTable stable)46 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 47 for (int i = 0; i < argumentCount(); i++) { 48 final Expression exp = argument(i); 49 if (!exp.typeCheck(stable).identicalTo(Type.String)) { 50 setArgument(i, new CastExpr(exp, Type.String)); 51 } 52 } 53 return _type = Type.String; 54 } 55 56 /** translate leaves a String on the stack */ translate(ClassGenerator classGen, MethodGenerator methodGen)57 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 58 final ConstantPoolGen cpg = classGen.getConstantPool(); 59 final InstructionList il = methodGen.getInstructionList(); 60 final int nArgs = argumentCount(); 61 62 switch (nArgs) { 63 case 0: 64 il.append(new PUSH(cpg, EMPTYSTRING)); 65 break; 66 67 case 1: 68 argument().translate(classGen, methodGen); 69 break; 70 71 default: 72 final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS, 73 "<init>", "()V"); 74 final Instruction append = 75 new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS, 76 "append", 77 "("+STRING_SIG+")" 78 +STRING_BUFFER_SIG)); 79 80 final int toString = cpg.addMethodref(STRING_BUFFER_CLASS, 81 "toString", 82 "()"+STRING_SIG); 83 84 il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS))); 85 il.append(DUP); 86 il.append(new INVOKESPECIAL(initBuffer)); 87 for (int i = 0; i < nArgs; i++) { 88 argument(i).translate(classGen, methodGen); 89 il.append(append); 90 } 91 il.append(new INVOKEVIRTUAL(toString)); 92 } 93 } 94 } 95