Add initial tests for Kernel interpreter

pkg/kernel/test/interpreter/suite.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.md file.
+
+library test.kernel.closures.suite;
+
+import 'dart:async' show Future;
+
+import 'dart:io' show File;
+
+import 'package:analyzer/src/generated/sdk.dart' show DartSdk;
+
+import 'package:analyzer/src/kernel/loader.dart' show DartLoader;
+
+import 'package:testing/testing.dart'
+    show Chain, Result, Step, TestDescription, runMe;
+
+import 'package:kernel/ast.dart' show Program, Library;
+
+import 'package:kernel/target/targets.dart' show Target, TargetFlags, getTarget;
+
+import 'package:front_end/src/fasta/testing/kernel_chain.dart';
+
+import 'package:front_end/src/fasta/ticker.dart' show Ticker;
+
+import 'package:front_end/src/fasta/dill/dill_target.dart' show DillTarget;
+
+import 'package:front_end/src/fasta/kernel/kernel_target.dart'
+    show KernelTarget;
+
+import 'package:front_end/src/fasta/translate_uri.dart' show TranslateUri;
+
+import 'package:front_end/src/fasta/errors.dart' show InputError;
+
+import 'package:kernel/interpreter/interpreter.dart';
+
+class InterpreterContext extends TestContext {
+  final TranslateUri uriTranslator;
+
+  final List<Step> steps;
+
+  Future<Program> platform;
+
+  InterpreterContext(Uri sdk, Uri vm, Uri packages, bool strongMode,
+      DartSdk dartSdk, this.uriTranslator)
+      : steps = <Step>[
+          const FastaCompile(),
+          const Interpret(),
+          const MatchLogExpectation(".expect"),
+        ],
+        super(sdk, vm, packages, strongMode, dartSdk);
+
+  Future<Program> createPlatform() {
+    return new Future<Program>(() async {
+      DartLoader loader = await createLoader();
+      Target target =
+          getTarget("vm", new TargetFlags(strongMode: options.strongMode));
+      loader.loadProgram(Uri.base.resolve("pkg/fasta/test/platform.dart"),
+          target: target);
+      var program = loader.program;
+      if (loader.errors.isNotEmpty) {
+        throw loader.errors.join("\n");
+      }
+      Library mainLibrary = program.mainMethod.enclosingLibrary;
+      program.uriToSource.remove(mainLibrary.fileUri);
+      program = new Program(
+          program.libraries.where((Library l) => l != mainLibrary).toList(),
+          program.uriToSource);
+      target.performModularTransformations(program);
+      target.performGlobalTransformations(program);
+      return program;
+    });
+  }
+
+  static Future<InterpreterContext> create(
+      Chain suite, Map<String, String> environment) async {
+    return TestContext.create(suite, environment, (Chain suite,
+        Map<String, String> environment,
+        Uri sdk,
+        Uri vm,
+        Uri packages,
+        bool strongMode,
+        DartSdk dartSdk,
+        bool updateExpectations) async {
+      TranslateUri uriTranslator = await TranslateUri.parse(packages);
+      return new InterpreterContext(
+          sdk, vm, packages, strongMode, dartSdk, uriTranslator);
+    });
+  }
+}
+
+class FastaCompile extends Step<TestDescription, Program, InterpreterContext> {
+  const FastaCompile();
+
+  String get name => "fasta compile";
+
+  Future<Result<Program>> run(
+      TestDescription description, InterpreterContext context) async {
+    Program platform = await context.createPlatform();
+    Ticker ticker = new Ticker();
+    DillTarget dillTarget = new DillTarget(ticker, context.uriTranslator);
+    dillTarget.loader
+      ..input = Uri.parse("org.dartlang:platform")
+      ..setProgram(platform);
+    KernelTarget sourceTarget =
+        new KernelTarget(dillTarget, context.uriTranslator, false);
+
+    Program p;
+    try {
+      sourceTarget.read(description.uri);
+      await dillTarget.writeOutline(null);
+      await sourceTarget.writeOutline(null);
+      p = await sourceTarget.writeProgram(null);
+    } on InputError catch (e, s) {
+      return fail(null, e.error, s);
+    }
+
+    return pass(p);
+  }
+}
+
+class Interpret extends Step<Program, EvaluationLog, InterpreterContext> {
+  const Interpret();
+
+  String get name => "interpret";
+
+  Future<Result<EvaluationLog>> run(Program program, _) async {
+    Library library = program.libraries
+        .firstWhere((Library library) => library.importUri.scheme != "dart");
+    Uri uri = library.importUri;
+
+    StringBuffer buffer = new StringBuffer();
+    log.onRecord.listen((LogRecord rec) => buffer.write(rec.message));
+
+    new Interpreter(program).run();

[Dmitry Stefantsov, 2017/05/01 13:29:49]

I think we may check here if .run() throws an exception, and return a "crash"
rather than a "pass" in this case. I guess in future, when we'll interpret
throws, we'll need to come up with a better way to distinguish between
exceptions in the interpreter and exceptions in the programs being interpreted.

[zhivkag, 2017/05/01 14:11:48]

It makes more sense, thanks! 

+    return pass(new EvaluationLog(uri, "$buffer"));
+  }
+}
+
+class MatchLogExpectation extends Step<EvaluationLog, int, InterpreterContext> {
+  final String suffix;
+
+  String get name => "match log expectation";
+
+  const MatchLogExpectation(this.suffix);
+
+  Future<Result<int>> run(EvaluationLog result, _) async {
+    Uri uri = result.uri;
+
+    File expectedFile = new File("${uri.toFilePath()}$suffix");
+    if (await expectedFile.exists()) {
+      String expected = await expectedFile.readAsString();
+      if (expected.trim() != result.log.trim()) {
+        String diff = await runDiff(expectedFile.uri, result.log);
+        return fail(null, "$uri doesn't match ${expectedFile.uri}\n$diff");
+      } else {
+        return pass(0);
+      }
+    }
+    return fail(
+        null,
+        """Please create file ${expectedFile.path} with this content:
+        ${result.log}""");
+  }
+}
+
+class EvaluationLog {
+  /// Evaluated program uri.
+  final Uri uri;
+
+  /// Evaluated program log.
+  final String log;
+
+  EvaluationLog(this.uri, this.log);
+}
+
+main(List<String> arguments) =>
+    runMe(arguments, InterpreterContext.create, "testing.json");