test/625-checker-licm-regressions/src/Main.java

/*
 * Copyright (C) 2016 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.
 */

/**
 * Regression tests for LICM.
 */
public class Main {

  static int sA;

  //
  // We cannot hoist the null check (can throw) above the field
  // assignment (has write side effects) because that would result
  // in throwing an exception before the assignment is done.
  //
  /// CHECK-START: void Main.foo(int[]) licm (before)
  /// CHECK-DAG: LoadClass      loop:<<Loop:B\d+>> outer_loop:none
  /// CHECK-DAG: StaticFieldSet loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: NullCheck      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: ArrayLength    loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: void Main.foo(int[]) licm (after)
  /// CHECK-DAG: LoadClass      loop:none
  /// CHECK-DAG: StaticFieldSet loop:<<Loop:B\d+>> outer_loop:none
  /// CHECK-DAG: NullCheck      loop:<<Loop>>      outer_loop:none
  /// CHECK-DAG: ArrayLength    loop:<<Loop>>      outer_loop:none
  //
  /// CHECK-START: void Main.foo(int[]) licm (after)
  /// CHECK-NOT: LoadClass      loop:{{B\d+}} outer_loop:none
  static void foo(int[] arr) {
    int j = 0;
    do {
      sA = 1;
    } while (j < arr.length);
  }

  public static void main(String[] args) {
    sA = 0;
    try {
      foo(null);
    } catch (Exception e) {
    }
    expectEquals(1, sA);

    System.out.println("passed");
  }

  private static void expectEquals(int expected, int result) {
    if (expected != result) {
      throw new Error("Expected: " + expected + ", found: " + result);
    }
  }
}