| /* |
| * Copyright (C) 2012 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.ast; |
| |
| import com.android.jack.Options; |
| import com.android.jack.ir.ast.JExpression; |
| import com.android.jack.ir.ast.JExpressionStatement; |
| import com.android.jack.ir.ast.JMethod; |
| import com.android.jack.ir.ast.JVariableRef; |
| import com.android.jack.ir.ast.JVisitor; |
| import com.android.jack.transformations.request.Remove; |
| import com.android.jack.transformations.request.TransformationRequest; |
| import com.android.jack.transformations.threeaddresscode.ThreeAddressCodeForm; |
| import com.android.jack.util.filter.Filter; |
| import com.android.sched.item.Description; |
| import com.android.sched.item.Name; |
| import com.android.sched.schedulable.Constraint; |
| import com.android.sched.schedulable.RunnableSchedulable; |
| import com.android.sched.schedulable.Transform; |
| import com.android.sched.util.config.ThreadConfig; |
| |
| import javax.annotation.Nonnull; |
| |
| /** |
| * Remove {@code JExpressionStatement} containing directly a {@code JVariableRef} or a |
| * {@code JArrayRef} ie code like {@code lv;}. |
| */ |
| @Description("Remove JVariableRef and JArrayRef as JExpressionStatement.") |
| @Name("RefAsStatementRemover") |
| @Constraint(need = {ThreeAddressCodeForm.class}) |
| @Transform(remove = RefAsStatement.class) |
| public class RefAsStatementRemover implements RunnableSchedulable<JMethod> { |
| |
| @Nonnull |
| private final Filter<JMethod> filter = ThreadConfig.get(Options.METHOD_FILTER); |
| |
| private static class Visitor extends JVisitor { |
| |
| @Nonnull |
| private final TransformationRequest tr; |
| |
| public Visitor(@Nonnull TransformationRequest tr) { |
| this.tr = tr; |
| } |
| |
| @Override |
| public boolean visit(@Nonnull JExpressionStatement expressionStatement) { |
| JExpression expr = expressionStatement.getExpr(); |
| |
| if (expr instanceof JVariableRef) { |
| tr.append(new Remove(expressionStatement)); |
| return false; |
| } else { |
| return super.visit(expressionStatement); |
| } |
| } |
| } |
| |
| @Override |
| public void run(@Nonnull JMethod method) throws Exception { |
| if (method.getEnclosingType().isExternal() || method.isNative() || method.isAbstract() |
| || !filter.accept(this.getClass(), method)) { |
| return; |
| } |
| |
| TransformationRequest tr = new TransformationRequest(method); |
| Visitor visitor = new Visitor(tr); |
| visitor.accept(method); |
| tr.commit(); |
| } |
| |
| } |