pkg/front_end/tool/incremental_perf_test.dart

// Copyright (c) 2017, 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.

/// Test to ensure that incremental_perf.dart is running without errors.

import 'dart:io';
import 'package:front_end/src/compute_platform_binaries_location.dart'
    show computePlatformBinariesLocation;
import 'incremental_perf.dart' as m;

/// Run the incremental compiler on a couple examples.
main() async {
  var sdkOutline = computePlatformBinariesLocation().resolve(
      // TODO(sigmund): switch to `vm_outline.dill` (issue #29881).
      "vm_platform.dill");
  var tmp = Directory.systemTemp.createTempSync();
  await runSmallExample(sdkOutline, tmp.uri);
  await runLargeExample(sdkOutline, tmp.uri);
  tmp.deleteSync(recursive: true);
}

/// Creates a small example with a few files in a temporary folder, and runs the
/// benchmark on it. The example includes several edits in sequence.
runSmallExample(Uri sdkOutline, Uri tmpUri) async {
  Map<String, String> files = {
    'a.dart': '''
        import 'b.dart';
        main() => b();
    ''',
    'b.dart': '''
        import 'c.dart';
        b() => new C().m1();
    ''',
    'c.dart': '''
        class C {
          m1() => print('hello1');
          m2() => print('hello2');
        }
    ''',
    //
    // iteration 1: no edits
    // iteration 2: edit b.dart (a.dart may recompile, c.dart unchanged)
    // iteration 3: no edits
    // iteration 4: edit c.dart (may recompile everything)
    // iteration 4: edit b.dart and c.dart to revert to state of iteration 1
    //              may skip recompile if compiler cached old results.
    'edits.json': '''[
      {
        "name" : "a",
        "edits": []
      },
      {
        "name" : "b",
        "edits": [
          ["${tmpUri.resolve('b.dart')}", "m1()", "m2()"]
        ]
      },
      {
        "name" : "c",
        "edits": []
      },
      {
        "name" : "d",
        "edits": [
          ["${tmpUri.resolve('c.dart')}", "hello1", "hello3"]
        ]
      },
      {
        "name" : "e",
        "edits": [
          ["${tmpUri.resolve('b.dart')}", "m2()", "m1()"],
          ["${tmpUri.resolve('c.dart')}", "hello3", "hello1"]
        ]
      }
    ]''',
  };

  files.forEach((name, contents) {
    new File.fromUri(tmpUri.resolve(name)).writeAsStringSync(contents);
  });
  var entryUri = tmpUri.resolve('a.dart');
  var jsonUri = tmpUri.resolve('edits.json');
  await m.main(['--sdk-summary', '$sdkOutline', '$entryUri', '$jsonUri']);
}

/// Create an example using the dart2js codebase. It can take a while to
/// compile dart2js, so to avoid timeouts we only run a single iteration of the
/// incremental compiler on this codebase.
runLargeExample(Uri sdkOutline, Uri tmpUri) async {
  var jsonUri = tmpUri.resolve('edits.json');
  var loaderFile =
      Platform.script.resolve('../../compiler/lib/src/library_loader.dart');
  new File.fromUri(jsonUri).writeAsStringSync(
      '[{ "name": "a", "edits": [["$loaderFile", "root=", "root2="]]}]');
  var entryUri = Platform.script.resolve('../../compiler/lib/src/dart2js.dart');
  await m.main(['--sdk-summary', '$sdkOutline', '$entryUri', '$jsonUri']);
}