tests/compiler/dart2js/impact/impact_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.

import 'dart:io';
import 'package:async_helper/async_helper.dart';
import 'package:compiler/src/compiler.dart';
import 'package:compiler/src/elements/entities.dart';
import 'package:compiler/src/frontend_strategy.dart';
import 'package:compiler/src/kernel/element_map.dart';
import 'package:compiler/src/kernel/kernel_strategy.dart';
import 'package:compiler/src/universe/world_impact.dart';
import 'package:compiler/src/universe/use.dart';
import '../equivalence/id_equivalence.dart';
import '../equivalence/id_equivalence_helper.dart';

main(List<String> args) {
  ImpactCacheDeleter.retainCachesForTesting = true;
  asyncTest(() async {
    Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
    await checkTests(dataDir, computeMemberImpact,
        args: args, skipForStrong: ['fallthrough.dart'], testFrontend: true);
  });
}

class Tags {
  static const String typeUse = 'type';
  static const String staticUse = 'static';
  static const String dynamicUse = 'dynamic';
  static const String constantUse = 'constant';
}

/// Compute type inference data for [member] from kernel based inference.
///
/// Fills [actualMap] with the data.
void computeMemberImpact(
    Compiler compiler, MemberEntity member, Map<Id, ActualData> actualMap,
    {bool verbose: false}) {
  KernelFrontEndStrategy frontendStrategy = compiler.frontendStrategy;
  WorldImpact impact = compiler.impactCache[member];
  MemberDefinition definition =
      frontendStrategy.elementMap.getMemberDefinition(member);
  Features features = new Features();
  if (impact.typeUses.length > 50) {
    features.addElement(Tags.typeUse, '*');
  } else {
    for (TypeUse use in impact.typeUses) {
      features.addElement(Tags.typeUse, use.shortText);
    }
  }
  if (impact.staticUses.length > 50) {
    features.addElement(Tags.staticUse, '*');
  } else {
    for (StaticUse use in impact.staticUses) {
      features.addElement(Tags.staticUse, use.shortText);
    }
  }
  for (DynamicUse use in impact.dynamicUses) {
    features.addElement(Tags.dynamicUse, use.shortText);
  }
  for (ConstantUse use in impact.constantUses) {
    features.addElement(Tags.constantUse, use.shortText);
  }
  Id id = computeEntityId(definition.node);
  actualMap[id] = new ActualData(new IdValue(id, features.getText()),
      computeSourceSpanFromTreeNode(definition.node), member);
}