test/482-checker-loop-back-edge-use/src/Main.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.
*/


public class Main {

  // CHECK-START: void Main.loop1(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,22)} uses:[17,22]
  // CHECK:         Goto            liveness:20
  public static void loop1(boolean incoming) {
    while (incoming) {}
  }

  // CHECK-START: void Main.loop2(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,42)} uses:[33,38,42]
  // CHECK:         Goto            liveness:36
  // CHECK:         Goto            liveness:40
  public static void loop2(boolean incoming) {
    while (true) {
      System.out.println("foo");
      while (incoming) {}
    }
  }

  // CHECK-START: void Main.loop3(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,60)} uses:[56,60]
  // CHECK:         Goto            liveness:58

  // CHECK-START: void Main.loop3(boolean) liveness (after)
  // CHECK-NOT:     Goto liveness:54
  public static void loop3(boolean incoming) {
    // 'incoming' only needs a use at the outer loop's back edge.
    while (System.currentTimeMillis() != 42) {
      while (Runtime.getRuntime() != null) {}
      System.out.println(incoming);
    }
  }

  // CHECK-START: void Main.loop4(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,22)} uses:[22]

  // CHECK-START: void Main.loop4(boolean) liveness (after)
  // CHECK-NOT:     Goto            liveness:20
  public static void loop4(boolean incoming) {
    // 'incoming' has no loop use, so should not have back edge uses.
    System.out.println(incoming);
    while (System.currentTimeMillis() != 42) {
      while (Runtime.getRuntime() != null) {}
    }
  }

  // CHECK-START: void Main.loop5(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,50)} uses:[33,42,46,50]
  // CHECK:         Goto            liveness:44
  // CHECK:         Goto            liveness:48
  public static void loop5(boolean incoming) {
    // 'incoming' must have a use at both back edges.
    while (Runtime.getRuntime() != null) {
      while (incoming) {
        System.out.println(incoming);
      }
    }
  }

  // CHECK-START: void Main.loop6(boolean) liveness (after)
  // CHECK          ParameterValue  liveness:2  ranges:{[2,46)} uses:[24,46]
  // CHECK:         Goto            liveness:44

  // CHECK-START: void Main.loop6(boolean) liveness (after)
  // CHECK-NOT:     Goto            liveness:22
  public static void loop6(boolean incoming) {
    // 'incoming' must have a use only at the first loop's back edge.
    while (true) {
      System.out.println(incoming);
      while (Runtime.getRuntime() != null) {}
    }
  }

  // CHECK-START: void Main.loop7(boolean) liveness (after)
  // CHECK:         ParameterValue  liveness:2  ranges:{[2,50)} uses:[32,41,46,50]
  // CHECK:         Goto            liveness:44
  // CHECK:         Goto            liveness:48
  public static void loop7(boolean incoming) {
    // 'incoming' must have a use at both back edges.
    while (Runtime.getRuntime() != null) {
      System.out.println(incoming);
      while (incoming) {}
    }
  }

  // CHECK-START: void Main.loop8() liveness (after)
  // CHECK:         StaticFieldGet  liveness:12 ranges:{[12,44)} uses:[35,40,44]
  // CHECK:         Goto            liveness:38
  // CHECK:         Goto            liveness:42
  public static void loop8() {
    // 'incoming' must have a use at both back edges.
    boolean incoming = field;
    while (Runtime.getRuntime() != null) {
      while (incoming) {}
    }
  }

  // CHECK-START: void Main.loop9() liveness (after)
  // CHECK:         StaticFieldGet  liveness:22 ranges:{[22,36)} uses:[31,36]
  // CHECK:         Goto            liveness:38
  public static void loop9() {
    while (Runtime.getRuntime() != null) {
      // 'incoming' must only have a use in the inner loop.
      boolean incoming = field;
      while (incoming) {}
    }
  }

  public static void main(String[] args) {
  }

  static boolean field;
}