| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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.android.jack.transformations; |
| |
| import com.android.jack.Options; |
| import com.android.jack.ir.ast.JDefinedClassOrInterface; |
| import com.android.jack.ir.ast.JMethod; |
| import com.android.jack.ir.ast.JMethodBody; |
| import com.android.jack.ir.ast.JReturnStatement; |
| import com.android.jack.ir.ast.JStatement; |
| import com.android.jack.scheduling.filter.TypeWithoutPrebuiltFilter; |
| import com.android.jack.transformations.request.Remove; |
| import com.android.jack.transformations.request.TransformationRequest; |
| import com.android.sched.item.Description; |
| import com.android.sched.schedulable.Constraint; |
| import com.android.sched.schedulable.ExclusiveAccess; |
| import com.android.sched.schedulable.Filter; |
| import com.android.sched.schedulable.RunnableSchedulable; |
| import com.android.sched.schedulable.Transform; |
| import com.android.sched.util.config.ThreadConfig; |
| |
| import java.util.List; |
| |
| import javax.annotation.Nonnull; |
| /** |
| * This {@link RunnableSchedulable} remove empty clinit methods. |
| */ |
| @Description("Remove empty clinit methods") |
| @Constraint(no = {InitializationExpression.class}) |
| @Transform(remove = {EmptyClinit.class}) |
| @Filter(TypeWithoutPrebuiltFilter.class) |
| // This schedulable removes some methods |
| @ExclusiveAccess(JDefinedClassOrInterface.class) |
| public class EmptyClinitRemover implements RunnableSchedulable<JMethod> { |
| |
| @Nonnull |
| private final com.android.jack.util.filter.Filter<JMethod> filter = |
| ThreadConfig.get(Options.METHOD_FILTER); |
| |
| @Override |
| public void run(@Nonnull JMethod method) { |
| if (JMethod.isClinit(method) && filter.accept(this.getClass(), method)) { |
| JMethodBody body = (JMethodBody) method.getBody(); |
| assert body != null; |
| List<JStatement> stmts = body.getStatements(); |
| if (stmts.isEmpty() || stmts.get(0) instanceof JReturnStatement) { |
| TransformationRequest tr = new TransformationRequest(method.getEnclosingType()); |
| tr.append(new Remove(method)); |
| tr.commit(); |
| } |
| } |
| } |
| } |