1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Copyright 2001-2004 The Apache Software Foundation. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * 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 * $Id: BinOpExpr.java,v 1.2.4.1 2005/09/01 11:42:27 pvedula Exp $ 22 */ 23 24 package com.sun.org.apache.xalan.internal.xsltc.compiler; 25 26 import com.sun.org.apache.bcel.internal.generic.InstructionList; 27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; 28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; 29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; 30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodType; 31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; 32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; 33 34 /** 35 * @author Jacek Ambroziak 36 * @author Santiago Pericas-Geertsen 37 */ 38 final class BinOpExpr extends Expression { 39 public static final int PLUS = 0; 40 public static final int MINUS = 1; 41 public static final int TIMES = 2; 42 public static final int DIV = 3; 43 public static final int MOD = 4; 44 45 private static final String[] Ops = { 46 "+", "-", "*", "/", "%" 47 }; 48 49 private int _op; 50 private Expression _left, _right; 51 BinOpExpr(int op, Expression left, Expression right)52 public BinOpExpr(int op, Expression left, Expression right) { 53 _op = op; 54 (_left = left).setParent(this); 55 (_right = right).setParent(this); 56 } 57 58 /** 59 * Returns true if this expressions contains a call to position(). This is 60 * needed for context changes in node steps containing multiple predicates. 61 */ hasPositionCall()62 public boolean hasPositionCall() { 63 if (_left.hasPositionCall()) return true; 64 if (_right.hasPositionCall()) return true; 65 return false; 66 } 67 68 /** 69 * Returns true if this expressions contains a call to last() 70 */ hasLastCall()71 public boolean hasLastCall() { 72 return (_left.hasLastCall() || _right.hasLastCall()); 73 } 74 setParser(Parser parser)75 public void setParser(Parser parser) { 76 super.setParser(parser); 77 _left.setParser(parser); 78 _right.setParser(parser); 79 } 80 typeCheck(SymbolTable stable)81 public Type typeCheck(SymbolTable stable) throws TypeCheckError { 82 final Type tleft = _left.typeCheck(stable); 83 final Type tright = _right.typeCheck(stable); 84 final MethodType ptype = lookupPrimop(stable, Ops[_op], 85 new MethodType(Type.Void, 86 tleft, tright)); 87 if (ptype != null) { 88 final Type arg1 = (Type) ptype.argsType().elementAt(0); 89 if (!arg1.identicalTo(tleft)) { 90 _left = new CastExpr(_left, arg1); 91 } 92 final Type arg2 = (Type) ptype.argsType().elementAt(1); 93 if (!arg2.identicalTo(tright)) { 94 _right = new CastExpr(_right, arg1); 95 } 96 return _type = ptype.resultType(); 97 } 98 throw new TypeCheckError(this); 99 } 100 translate(ClassGenerator classGen, MethodGenerator methodGen)101 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { 102 final InstructionList il = methodGen.getInstructionList(); 103 104 _left.translate(classGen, methodGen); 105 _right.translate(classGen, methodGen); 106 107 switch (_op) { 108 case PLUS: 109 il.append(_type.ADD()); 110 break; 111 case MINUS: 112 il.append(_type.SUB()); 113 break; 114 case TIMES: 115 il.append(_type.MUL()); 116 break; 117 case DIV: 118 il.append(_type.DIV()); 119 break; 120 case MOD: 121 il.append(_type.REM()); 122 break; 123 default: 124 ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_BINARY_OP_ERR, this); 125 getParser().reportError(Constants.ERROR, msg); 126 } 127 } 128 toString()129 public String toString() { 130 return Ops[_op] + '(' + _left + ", " + _right + ')'; 131 } 132 } 133