| /* |
| * Copyright 2007 Google Inc. |
| * |
| * 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. |
| */ |
| package com.google.gwt.dev.jjs.ast; |
| |
| import com.google.gwt.dev.jjs.SourceInfo; |
| |
| /** |
| * Binary operator expression. |
| */ |
| public class JBinaryOperation extends JExpression { |
| |
| private JExpression lhs; |
| private final JBinaryOperator op; |
| private JExpression rhs; |
| private JType type; |
| |
| public JBinaryOperation(SourceInfo info, JType type, JBinaryOperator op, JExpression lhs, |
| JExpression rhs) { |
| super(info); |
| this.op = op; |
| this.type = type; |
| this.lhs = lhs; |
| this.rhs = rhs; |
| } |
| |
| public JExpression getLhs() { |
| return lhs; |
| } |
| |
| public JBinaryOperator getOp() { |
| return op; |
| } |
| |
| public JExpression getRhs() { |
| return rhs; |
| } |
| |
| @Override |
| public JType getType() { |
| JType resultType = this.type; |
| if (isAssignment()) { |
| // Use the type of the lhs |
| resultType = getLhs().getType(); |
| } |
| |
| if (op != JBinaryOperator.ASG |
| && !resultType.isNullType() |
| && resultType instanceof JReferenceType) { |
| // Except the = operation all other binary operations return a non-nullable exact type. |
| resultType = ((JReferenceType) resultType).strengthenToNonNull().strengthenToExact(); |
| } |
| return resultType; |
| } |
| |
| @Override |
| public boolean hasSideEffects() { |
| return op.isAssignment() || getLhs().hasSideEffects() || getRhs().hasSideEffects(); |
| } |
| |
| public boolean isAssignment() { |
| return op.isAssignment(); |
| } |
| |
| public void setType(JType newType) { |
| type = newType; |
| } |
| |
| @Override |
| public void traverse(JVisitor visitor, Context ctx) { |
| if (visitor.visit(this, ctx)) { |
| if (isAssignment()) { |
| lhs = visitor.acceptLvalue(lhs); |
| } else { |
| lhs = visitor.accept(lhs); |
| } |
| rhs = visitor.accept(rhs); |
| } |
| visitor.endVisit(this, ctx); |
| } |
| |
| } |