1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * @LastModified: Oct 2017 4 */ 5 /* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package com.sun.org.apache.xalan.internal.xsltc.compiler; 23 24 import com.sun.org.apache.bcel.internal.generic.InstructionList; 25 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 26 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodType; 28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 30 31 /** 32 * @author Jacek Ambroziak 33 * @author Santiago Pericas-Geertsen 34 */ 35 final class UnaryOpExpr extends Expression { 36 private Expression _left; 37 38 public UnaryOpExpr(Expression left) { 39 (_left = left).setParent(this); 40 } 41 42 /** 43 * Returns true if this expressions contains a call to position(). This is 44 * needed for context changes in node steps containing multiple predicates. 45 */ 46 public boolean hasPositionCall() { 47 return(_left.hasPositionCall()); 48 } 49 50 /** 51 * Returns true if this expressions contains a call to last() 52 */ 53 public boolean hasLastCall() { 54 return(_left.hasLastCall()); 55 } 56 57 public void setParser(Parser parser) { 58 super.setParser(parser); 59 _left.setParser(parser); 60 } 61 62 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 63 final Type tleft = _left.typeCheck(stable); 64 final MethodType ptype = lookupPrimop(stable, "u-", 65 new MethodType(Type.Void, 66 tleft)); 67 68 if (ptype != null) { 69 final Type arg1 = ptype.argsType().get(0); 70 if (!arg1.identicalTo(tleft)) { 71 _left = new CastExpr(_left, arg1); 72 } 73 return _type = ptype.resultType(); 74 } 75 76 throw new TypeCheckError(this); 77 } 78 79 public String toString() { 80 return "u-" + '(' + _left + ')'; 81 } 82 83 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 84 InstructionList il = methodGen.getInstructionList(); 85 _left.translate(classGen, methodGen); 86 il.append(_type.NEG()); 87 } 88 }