jack/src/com/android/jack/shrob/shrink/TypeShrinker.java

/*
 * Copyright (C) 2015 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.shrob.shrink;

import com.android.jack.ir.ast.JDefinedClassOrInterface;
import com.android.jack.ir.ast.JMethod;
import com.android.jack.ir.ast.JNode;
import com.android.jack.ir.ast.JSession;
import com.android.jack.transformations.TypeRemover;
import com.android.sched.item.Description;
import com.android.sched.item.Synchronized;
import com.android.sched.schedulable.Constraint;
import com.android.sched.schedulable.ExclusiveAccess;
import com.android.sched.schedulable.RunnableSchedulable;
import com.android.sched.util.log.TracerFactory;

import javax.annotation.Nonnull;

/**
 * A {@link RunnableSchedulable} removing all types not marked with the {@link KeepMarker}.
 */
@Description("Removes all types not marked with the KeepMarker")
@Synchronized
@Constraint(need = KeepMarker.class)
// This schedulable removes some types and updates the hierarchy
@ExclusiveAccess(JSession.class)
public class TypeShrinker extends TypeRemover {

  @Nonnull
  private final com.android.sched.util.log.Tracer tracer = TracerFactory.getTracer();

  @Override
  protected boolean mustBeRemoved(@Nonnull JDefinedClassOrInterface type) {
    // Type from classpath can not be remove
    return !isTypeFromClasspath(type) && !((JNode) type).containsMarker(KeepMarker.class);
  }

  @Override
  public void run(@Nonnull JDefinedClassOrInterface type) {
    super.run(type);
    tracer.getStatistic(ShrinkStatistic.TYPES_REMOVED).add(mustBeRemoved(type));
  }

  @Override
  protected boolean isPlannedForRemoval(@Nonnull JMethod method) {
    return method.getEnclosingType().isToEmit()
        && !((JNode) method).containsMarker(KeepMarker.class);
  }
}