pkg/compiler/test/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.

// @dart = 2.7

import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
import '../helpers/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() {
  runTests() async {
    String generated1 = await compile(TEST1, disableTypeInference: false);
    Expect.isTrue(
        generated1.contains('if (typeof t1'),
        "Code pattern 'if (typeof t1' not found in\n$generated1\n"
        "for source\n$TEST1");

    String generated2 = await compile(TEST2, disableTypeInference: false);
    Expect.isTrue(
        generated2.contains('if (typeof t1'),
        "Code pattern 'if (typeof t1' not found in\n$generated2\n"
        "for source\n$TEST2");

    String generated3 = await compile(TEST3, disableTypeInference: false);
    Expect.isTrue(
        generated3.contains('if (typeof t1'),
        "Code pattern 'if (typeof t1' not found in\n$generated3\n"
        "for source\n$TEST3");

    String generated4 = await compile(TEST4, disableTypeInference: false);
    Expect.isTrue(
        generated4.contains('if (typeof t1'),
        "Code pattern 'if (typeof t1' not found in\n$generated4\n"
        "for source\n$TEST4");

    String generated5 = await compile(TEST5, disableTypeInference: false);
    Expect.isFalse(
        generated5.contains('iae'),
        "Code pattern 'iae' found in\n$generated5\n"
        "for source\n$TEST5");

    String generated6 = await compile(TEST6, disableTypeInference: false);
    Expect.isFalse(
        generated6.contains('iae'),
        "Code pattern 'iae' found in\n$generated6\n"
        "for source\n$TEST6");

    var memberInvocations = const <String>[
      'first',
      'last',
      'single',
      'singleWhere((x) => true)',
      'elementAt(0)',
      'removeAt(0)',
      'removeLast()',
    ];
    for (String member in memberInvocations) {
      String generated =
          await compile(generateTest('$member'), disableTypeInference: false);
      Expect.isTrue(
          generated.contains('+ 42'),
          "Missing '+ 42' code for invocation '$member':\n"
          "$generated");
      Expect.isFalse(
          generated.contains('if (typeof t1'),
          "Unexpected 'if (typeof t1' code for invocation '$member':\n"
          "$generated");
      Expect.isFalse(
          generated.contains('if (t1 == null)'),
          "Unexpected 'if (t1 == null)' code for invocation '$member':\n"
          "$generated");
    }
  }

  asyncTest(() async {
    print('--test from kernel------------------------------------------------');
    await runTests();
  });
}