content: /*
   * 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);
    }
  
    //
    // Similar situation as in foo(), but now a proper induction value
    // is assigned to the field inside the do-while loop.
    //
    /// CHECK-START: void Main.bar(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.bar(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.bar(int[]) licm (after)
    /// CHECK-NOT: LoadClass      loop:{{B\d+}} outer_loop:none
    static void bar(int[] arr) {
      int j = 0;
      do {
        j++;
        sA = j;
      } while (j < arr.length);
    }
  
    //
    // Similar situation as in bar(), but now an explicit catch
    // statement may need the latest value of local j.
    //
    /// CHECK-START: int Main.catcher(int[]) licm (before)
    /// CHECK-DAG: NullCheck   loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG: ArrayLength loop:<<Loop>>      outer_loop:none
    //
    /// CHECK-START: int Main.catcher(int[]) licm (after)
    /// CHECK-DAG: NullCheck   loop:<<Loop:B\d+>> outer_loop:none
    /// CHECK-DAG: ArrayLength loop:<<Loop>>      outer_loop:none
    static int catcher(int[] arr) {
      int j = 0;
      try {
        do {
          j++;
        } while (j < arr.length);
      } catch (NullPointerException e) {
        return -j;  // flag exception with negative value
      }
      return j;
    }
  
    public static void main(String[] args) {
      sA = 0;
      try {
        foo(null);
        throw new Error("Expected NPE");
      } catch (NullPointerException e) {
      }
      expectEquals(1, sA);
  
      sA = 0;
      try {
        bar(null);
        throw new Error("Expected NPE");
      } catch (NullPointerException e) {
      }
      expectEquals(1, sA);
  
      for (int i = 0; i < 5; i++) {
        sA = 0;
        bar(new int[i]);
        expectEquals(i == 0 ? 1 : i, sA);
      }
  
      expectEquals(-1, catcher(null));
      for (int i = 0; i < 5; i++) {
        expectEquals(i == 0 ? 1 : i, catcher(new int[i]));
      }
  
      System.out.println("passed");
    }
  
    private static void expectEquals(int expected, int result) {
      if (expected != result) {
        throw new Error("Expected: " + expected + ", found: " + result);
      }
    }
  }
  