infer_clone/infer/tests/codetoanalyze/java/impurity/PurityModeled.java

/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
class PurityModeled {

  double math_random_impure() {
    return Math.random();
  }

  double math_random_infeasible_pure(int x) {
    if (x > 1 && x < 2) {
      return Math.random(); // this path will never be taken
    }
    return 0;
  }

  void arraycopy_pure_FP(int[] src) {
    int[] dst = {5, 10, 20, 30, 40, 50};
    // copies an array from the specified source array
    System.arraycopy(src, 0, dst, 0, 1);
  }

  public void array_length_loop_pure(Integer[] array) {
    for (int i = 0; i < array.length; i++) {}
  }

  void write_impure() {
    byte[] temp = new byte[4];
    System.out.write(temp, 0, 4);
  }

  void call_write_impure() {
    write_impure();
  }

  int math_random_in_loop_impure(int x) {
    int p = 0;
    for (int i = 0; i < x; i++) {
      p += Math.random();
      call_write_impure();
    }

    return p;
  }
}