jack/src/com/android/jack/analysis/UsedVariableRemover.java

/*
 * 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.analysis;

import com.android.jack.Options;
import com.android.jack.cfg.BasicBlock;
import com.android.jack.cfg.ControlFlowGraph;
import com.android.jack.ir.ast.JMethod;
import com.android.jack.ir.ast.JStatement;
import com.android.jack.scheduling.filter.TypeWithoutPrebuiltFilter;
import com.android.sched.item.Description;
import com.android.sched.schedulable.Constraint;
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 javax.annotation.Nonnull;

/**
 * Remove UsedVariableMarker.
 */
@Description("Remove UsedVariableMarker.")
@Constraint(need = {UsedVariableMarker.class, ControlFlowGraph.class})
@Transform(remove = UsedVariableMarker.class)
@Filter(TypeWithoutPrebuiltFilter.class)
public class UsedVariableRemover 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 (method.isNative() || method.isAbstract() || !filter.accept(this.getClass(), method)) {
      return;
    }

    ControlFlowGraph cfg = method.getMarker(ControlFlowGraph.class);
    assert cfg != null;

    for (BasicBlock bb : cfg.getNodes()) {
      for (JStatement stmt : bb.getStatements()) {
        stmt.removeMarker(UsedVariableMarker.class);
      }
    }
  }
}