infer_clone/infer/tests/codetoanalyze/java/threadsafety/ReadWriteRaces.java

/*
 * Copyright (c) 2016 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package codetoanalyze.java.checkers;

import java.util.concurrent.locks.ReentrantLock;
import javax.annotation.concurrent.ThreadSafe;

class C {
  private int x = 0;

  public int get() {
    return x;
  }

  public void set(int v) {
    x = v;
  }
}

@ThreadSafe
class ReadWriteRaces {

  // read and write outside of sync races
  Integer safe_read;
  Integer racy;

  void m0_OK(){
   Integer local;
   local = safe_read;
   }

  void m0_OK2(){ //parallel reads are OK
   Integer local;
   local = safe_read;
  }

  void m1(){ // A read where there are other writes
   Integer local;
   local = racy;
  }

  public void m2(){
   racy = 88;
  }

  public void m3(){
   racy = 99;
  }

  // write inside sync, read outside of sync races
  Object field1;
  Object field2;
  Object field3;

  // need to report races involving safe writes in order to get this one
  public synchronized void syncWrite1() {
    field1 = new Object();
  }

  public Object unprotectedRead1() {
    return field1;
  }

  private Object unprotectedReadInCallee() {
    return field1;
  }

  public Object callUnprotecteReadInCallee() {
    return unprotectedReadInCallee();
  }

  public void syncWrite2() {
    synchronized(this) {
      field2 = new Object();
    }
  }

  public Object unprotectedRead2() {
    return field2;
  }

  private synchronized void syncWrite3() {
    field3 = new Object();
  }

  public void callSyncWrite3() {
    syncWrite3();
  }

  public Object unprotectedRead3() {
    return field3;
  }

  private final C c = new C();
  private final ReentrantLock lock = new ReentrantLock();

  public void readInCalleeOutsideSyncBad(int i) {
    if (c.get() > i) { // should report read/write race here
      lock.lock();
      c.set(i);
      lock.unlock();
    }
  }

  // write outside sync, read inside of sync races

  Object field4;

  public void unprotectedWrite4Bad() {
    this.field4 = new Object();
  }

  public synchronized Object protectedRead4Bad() {
    return this.field4;
  }


}