Compute ResolutionImpact directly from kernel, part 1 of ?

tests/compiler/dart2js/kernel/impact_test.dart

+// Copyright (c) 2016, 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.
+
+library dart2js.kernel.impact_test;
+
+import 'dart:async';
+import 'package:async_helper/async_helper.dart';
+import 'package:compiler/src/common.dart';
+import 'package:compiler/src/commandline_options.dart';
+import 'package:compiler/src/common/resolution.dart';
+import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/ssa/kernel_impact.dart';
+import 'package:compiler/src/serialization/equivalence.dart';
+import '../memory_compiler.dart';
+import '../serialization/test_helper.dart';
+
+const Map<String, String> SOURCE = const <String, String>{
+  'main.dart': '''
+main() {
+  testEmpty();
+  testNull();
+  testTrue();
+  testFalse();
+  testInt();
+  testDouble();
+  testString();
+  testSymbol();
+  testEmptyListLiteral();
+  testEmptyListLiteralDynamic();
+  testEmptyListLiteralTyped();
+  testEmptyListLiteralConstant();
+  testNonEmptyListLiteral();
+  testEmptyMapLiteral();
+  testEmptyMapLiteralDynamic();
+  testEmptyMapLiteralTyped();
+  testEmptyMapLiteralConstant();
+  testNonEmptyMapLiteral();
+  testNot();
+  testUnaryMinus();
+  testIfThen();
+  testIfThenElse();
+}
+
+testEmpty() {}
+testNull() => null;
+testTrue() => true;
+testFalse() => false;
+testInt() => 42;
+testDouble() => 37.5;
+testString() => 'foo';
+testSymbol() => #main;
+testEmptyListLiteral() => [];
+testEmptyListLiteralDynamic() => <dynamic>[];
+testEmptyListLiteralTyped() => <String>[];
+testEmptyListLiteralConstant() => const [];
+testNonEmptyListLiteral() => [0];
+testEmptyMapLiteral() => {};
+testEmptyMapLiteralDynamic() => <dynamic, dynamic>{};
+testEmptyMapLiteralTyped() => <String, int>{};
+testEmptyMapLiteralConstant() => const {};
+testNonEmptyMapLiteral() => {0: true};
+testNot() => !false;
+testUnaryMinus() => -1;
+testIfThen() {
+  if (false) return 42;
+  return 1;
+}
+testIfThenElse() {
+  if (true) {
+    return 42;
+  } else {
+    return 1;
+  }
+}
+'''
+};
+
+main(List<String> args) {
+  asyncTest(() async {
+    enableDebugMode();
+    Uri entryPoint = Uri.parse('memory:main.dart');
+    Compiler compiler = compilerFor(
+        entryPoint: entryPoint,
+        memorySourceFiles: SOURCE,
+        options: [Flags.analyzeOnly]);
+    compiler.resolution.retainCachesForTesting = true;
+    await compiler.run(entryPoint);
+    compiler.mainApp.forEachLocalMember(
+        (element) => checkElement(compiler, element));
+  });
+}
+
+void checkElement(Compiler compiler, AstElement element) {
+  ResolutionImpact astImpact =
+      compiler.resolution.getResolutionImpact(element);
+  ResolutionImpact kernelImpact = build(compiler, element.resolvedAst);
+  testResolutionImpactEquivalence(astImpact, kernelImpact,
+      const CheckStrategy());
+}