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