- /*
- * 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: BinOpExpr.java,v 1.11 2004/02/16 22:24:29 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.compiler;
-
- import com.sun.org.apache.bcel.internal.generic.InstructionList;
- 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.MethodType;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
-
- /**
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- final class BinOpExpr extends Expression {
- public static final int PLUS = 0;
- public static final int MINUS = 1;
- public static final int TIMES = 2;
- public static final int DIV = 3;
- public static final int MOD = 4;
-
- private static final String[] Ops = {
- "+", "-", "*", "/", "%"
- };
-
- private int _op;
- private Expression _left, _right;
-
- public BinOpExpr(int op, Expression left, Expression right) {
- _op = op;
- (_left = left).setParent(this);
- (_right = right).setParent(this);
- }
-
- /**
- * Returns true if this expressions contains a call to position(). This is
- * needed for context changes in node steps containing multiple predicates.
- */
- public boolean hasPositionCall() {
- if (_left.hasPositionCall()) return true;
- if (_right.hasPositionCall()) return true;
- return false;
- }
-
- /**
- * Returns true if this expressions contains a call to last()
- */
- public boolean hasLastCall() {
- return (_left.hasLastCall() || _right.hasLastCall());
- }
-
- public void setParser(Parser parser) {
- super.setParser(parser);
- _left.setParser(parser);
- _right.setParser(parser);
- }
-
- public Type typeCheck(SymbolTable stable) throws TypeCheckError {
- final Type tleft = _left.typeCheck(stable);
- final Type tright = _right.typeCheck(stable);
- final MethodType ptype = lookupPrimop(stable, Ops[_op],
- new MethodType(Type.Void,
- tleft, tright));
- if (ptype != null) {
- final Type arg1 = (Type) ptype.argsType().elementAt(0);
- if (!arg1.identicalTo(tleft)) {
- _left = new CastExpr(_left, arg1);
- }
- final Type arg2 = (Type) ptype.argsType().elementAt(1);
- if (!arg2.identicalTo(tright)) {
- _right = new CastExpr(_right, arg1);
- }
- return _type = ptype.resultType();
- }
- throw new TypeCheckError(this);
- }
-
- public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
- final InstructionList il = methodGen.getInstructionList();
-
- _left.translate(classGen, methodGen);
- _right.translate(classGen, methodGen);
-
- switch (_op) {
- case PLUS:
- il.append(_type.ADD());
- break;
- case MINUS:
- il.append(_type.SUB());
- break;
- case TIMES:
- il.append(_type.MUL());
- break;
- case DIV:
- il.append(_type.DIV());
- break;
- case MOD:
- il.append(_type.REM());
- break;
- default:
- ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_BINARY_OP_ERR, this);
- getParser().reportError(Constants.ERROR, msg);
- }
- }
-
- public String toString() {
- return Ops[_op] + '(' + _left + ", " + _right + ')';
- }
- }