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/*
* 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.cast;
import com.android.jack.Options;
import com.android.jack.ir.ast.JCastOperation;
import com.android.jack.ir.ast.JDynamicCastOperation;
import com.android.jack.ir.ast.JExpression;
import com.android.jack.ir.ast.JMethod;
import com.android.jack.ir.ast.JNullLiteral;
import com.android.jack.ir.ast.JReferenceType;
import com.android.jack.ir.ast.JType;
import com.android.jack.ir.ast.JVisitor;
import com.android.jack.transformations.request.Replace;
import com.android.jack.transformations.request.TransformationRequest;
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;
/**
* Removes useless casts.
*/
@Description("Removes useless casts.")
@Name("UselessCastRemover")
@Constraint(need = JDynamicCastOperation.class)
@Transform(remove = SourceCast.class)
public class UselessCastRemover implements RunnableSchedulable<JMethod> {
@Nonnull
private final Filter<JMethod> filter = ThreadConfig.get(Options.METHOD_FILTER);
private static class Visitor extends JVisitor {
@Nonnull
private final TransformationRequest request;
public Visitor(@Nonnull TransformationRequest request) {
this.request = request;
}
@Override
public void endVisit(@Nonnull JCastOperation cast) {
JType destType = cast.getCastType();
JExpression castedExpr = cast.getExpr();
JType srcType = castedExpr.getType();
// Do not remove cast of 'null' expression otherwise type is lost
if (!(castedExpr instanceof JNullLiteral)) {
if (srcType instanceof JReferenceType && destType instanceof JReferenceType) {
if (((JReferenceType) srcType).canBeSafelyUpcast((JReferenceType) destType)) {
request.append(new Replace(cast, castedExpr));
}
}
}
super.endVisit(cast);
}
}
@Override
public void run(@Nonnull JMethod method) throws Exception {
if (method.getEnclosingType().isExternal() || method.isNative() || method.isAbstract()
|| !filter.accept(UselessCastRemover.class, method)) {
return;
}
TransformationRequest request = new TransformationRequest(method);
Visitor visitor = new Visitor(request);
visitor.accept(method);
request.commit();
}
}
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