checker/tests/nullness/Issue1797.java

// Test case for Issue 1797:
// https://github.com/typetools/checker-framework/issues/1797

import org.checkerframework.checker.nullness.qual.Nullable;

public class Issue1797 {
  void fooReturn(@Nullable Object o) {
    try {
      return;
    } finally {
      if (o != null) {
        o.toString();
      }
    }
  }

  void fooWhileReturn(@Nullable Object o) {
    while (this.hashCode() < 5) {
      try {
        return;
      } finally {
        if (o != null) {
          o.toString();
        }
      }
    }
  }

  void fooReturnNested(@Nullable Object o) {
    while (this.hashCode() < 10) {
      while (this.hashCode() < 5) {
        try {
          return;
        } finally {
          if (o != null) {
            o.toString();
          }
          // go to exit, not either loop
        }
      }
    }
  }

  void fooBreak(@Nullable Object o) {
    while (this.hashCode() < 5) {
      try {
        break;
      } finally {
        if (o != null) {
          o.toString();
        }
      }
    }
  }

  void fooBreakLabel(@Nullable Object o) {
    outer:
    while (this.hashCode() < 10) {
      while (this.hashCode() < 5) {
        try {
          break outer;
        } finally {
          if (o != null) {
            o.toString();
          }
          // continue after outer
        }
      }
    }
  }

  void fooBreakLabel2(@Nullable Object o) {
    outer:
    while (this.hashCode() < 10) {
      try {
        inner:
        while (this.hashCode() < 5) {
          if (this.hashCode() < 2) {
            break outer;
            // go to finally
          } else {
            break inner;
            // do not go to finally
          }
        }
      } finally {
        if (o != null) {
          o.toString();
        }
        // continue either at outer or after outer
      }
    }
  }

  void fooBreakNoLabel(@Nullable Object o) {
    outer:
    while (this.hashCode() < 10) {
      inner:
      while (this.hashCode() < 5) {
        try {
          break;
        } finally {
          if (o != null) {
            o.toString();
          }
          // continue at outer
        }
      }
    }
  }

  void fooContinue(@Nullable Object o) {
    while (this.hashCode() < 5) {
      try {
        continue;
      } finally {
        if (o != null) {
          o.toString();
        }
      }
    }
  }

  void fooContinueLabel(@Nullable Object o) {
    outer:
    while (this.hashCode() < 10) {
      while (this.hashCode() < 5) {
        try {
          continue outer;
        } finally {
          if (o != null) {
            o.toString();
          }
        }
      }
    }
  }

  void fooSwitch(@Nullable Object o) {
    switch (this.hashCode()) {
      case 1:
        try {
          break;
        } finally {
          if (o != null) {
            o.toString();
          }
        }
      default:
    }
  }

  // A few tests to make sure also return with expression works.

  int barReturn(@Nullable Object o) {
    try {
      return 5;
    } finally {
      if (o != null) {
        o.toString();
      }
    }
  }

  int barReturnInFinally(@Nullable Object o) {
    try {
      return 5;
    } finally {
      if (o != null) {
        o.toString();
      }
      return 10;
    }
  }

  int barReturnNested(@Nullable Object o) {
    while (this.hashCode() < 10) {
      while (this.hashCode() < 5) {
        try {
          return 5;
        } finally {
          if (o != null) {
            o.toString();
          }
          // goes to return 5, not either loop!
        }
      }
    }
    return 10;
  }

  @FunctionalInterface
  interface NullableParamFunction {
    String takeVal(@Nullable Object x);
  }

  void testLambda() {
    NullableParamFunction n1 = (@Nullable Object x) -> (x == null) ? "null" : x.toString();
    try {
      NullableParamFunction n2 = (@Nullable Object x) -> (x == null) ? "null" : x.toString();
    } finally {
      NullableParamFunction n3 = (x) -> (x == null) ? "null" : x.toString();
    }
  }

  boolean nestedCFGConstructionTest(@Nullable Object o) {
    boolean result = true;
    java.io.BufferedWriter out = null;
    try {
      try {
      } finally {
        out = new java.io.BufferedWriter(new java.io.OutputStreamWriter(System.err));
      }
      if (o != null) {
        o.toString();
        out.write(' ');
      }
    } catch (Exception e) {
    } finally {
    }
    return result;
  }

  void nestedTryFinally() {
    try {
      try {
      } finally {
      }
    } finally {
    }
  }

  boolean nestedCFGConstructionTest2() throws java.io.IOException {
    java.io.BufferedWriter out =
        new java.io.BufferedWriter(new java.io.OutputStreamWriter(System.err));
    try {
      try {
        return true;
      } finally {
      }
    } finally {
      out.write(' ');
      out.close();
    }
  }

  void nestedTryFinally2(java.io.BufferedWriter out) throws java.io.IOException {
    try {
      try {
        return;
      } finally {
      }
    } finally {
      out.write(' ');
      out.close();
    }
  }
}