tests/compiler/dart2js/codegen/list_tracer_node_type_test.dart

// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// TODO(johnniwinther): Move this to the codegen folder. Currently this only
/// works with the mock compiler.

import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
import '../compiler_helper.dart';

const String TEST1 = r"""
main() {
  var a = [42, null];
  return a[0] + 42;
}
""";

const String TEST2 = r"""
main() {
  var a = new List();
  a.add(42);
  a.add(null);
  return a[0] + 42;
}
""";

const String TEST3 = r"""
main() {
  var a = new List(42);
  a[a.length - 1] = 42;
  return a[0] + 42;
}
""";

const String TEST4 = r"""
main() {
  var a = new List.filled(42, null);
  a[a.length - 1] = 42;
  return 42 + a[0];
}
""";

// Test that the backend knows the element type of a const list.
const String TEST5 = r"""
var b = 4;
main() {
  var a = const [1, 2, 3];
  return 42 + a[b];
}
""";

// Test that the backend knows the element type of a const static.
const String TEST6 = r"""
const a = const [1, 2, 3];
var b = 4;
main() {
  return 42 + a[b];
}
""";

String generateTest(String call) {
  return """
main() {
  List differentType = [true, false];
  List a = [42];
  return a.$call + 42;
}
""";
}

main() {
  asyncTest(() => compileAll(TEST1).then((generated) {
        Expect.isTrue(generated.contains('if (typeof t1'));
      }));

  asyncTest(() => compileAll(TEST2).then((generated) {
        Expect.isTrue(generated.contains('if (typeof t1'));
      }));

  asyncTest(() => compileAll(TEST3).then((generated) {
        Expect.isTrue(generated.contains('if (typeof t1'));
      }));

  asyncTest(() => compileAll(TEST4).then((generated) {
        Expect.isTrue(generated.contains('if (typeof t1'));
      }));

  asyncTest(() => compileAll(TEST5).then((generated) {
        Expect.isFalse(generated.contains('iae'));
      }));

  asyncTest(() => compileAll(TEST6).then((generated) {
        Expect.isFalse(generated.contains('iae'));
      }));

  var memberInvocations = const <String>[
    'first',
    'last',
    'single',
    'singleWhere((x) => true)',
    'elementAt(0)',
    'removeAt(0)',
    'removeLast()',
  ];
  memberInvocations
      .map((member) => generateTest('$member'))
      .forEach((String test) {
    asyncTest(() => compileAll(test, expectedErrors: 0, expectedWarnings: 0)
            .then((generated) {
          Expect.isTrue(generated.contains('+ 42'));
          Expect.isFalse(generated.contains('if (typeof t1'));
          Expect.isFalse(generated.contains('if (t1 == null)'));
        }));
  });
}