| /* |
| * Copyright 2008 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.impl; |
| |
| import com.google.gwt.dev.jjs.ast.Context; |
| import com.google.gwt.dev.jjs.ast.JConstructor; |
| import com.google.gwt.dev.jjs.ast.JExpressionStatement; |
| import com.google.gwt.dev.jjs.ast.JMethodCall; |
| import com.google.gwt.dev.jjs.ast.JModVisitor; |
| import com.google.gwt.dev.jjs.ast.JNewInstance; |
| import com.google.gwt.dev.jjs.ast.JProgram; |
| import com.google.gwt.dev.jjs.ast.js.JMultiExpression; |
| |
| /** |
| * Removes calls to no-op super constructors. |
| */ |
| public class RemoveEmptySuperCalls { |
| |
| /** |
| * Removes calls to no-op super constructors. |
| */ |
| public static class EmptySuperCallVisitor extends JModVisitor { |
| @Override |
| public void endVisit(JExpressionStatement x, Context ctx) { |
| if (x.getExpr() instanceof JMethodCall && !(x.getExpr() instanceof JNewInstance)) { |
| JMethodCall call = (JMethodCall) x.getExpr(); |
| if (call.getTarget() instanceof JConstructor) { |
| JConstructor ctor = (JConstructor) call.getTarget(); |
| if (ctor.isEmpty() && !ctor.isJsNative()) { |
| // TODO: move this 3-way into Simplifier. |
| if (call.getArgs().isEmpty()) { |
| ctx.removeMe(); |
| } else if (call.getArgs().size() == 1) { |
| ctx.replaceMe(call.getArgs().get(0).makeStatement()); |
| } else { |
| JMultiExpression multi = new JMultiExpression(call.getSourceInfo()); |
| multi.addExpressions(call.getArgs()); |
| ctx.replaceMe(multi.makeStatement()); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| public static boolean exec(JProgram program) { |
| EmptySuperCallVisitor v = new EmptySuperCallVisitor(); |
| v.accept(program); |
| return v.didChange(); |
| } |
| } |