pkg/front_end/test/incremental_load_from_dill_test.dart - sdk.git - Git at Google

 // Copyright (c) 2018, 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:async' show Future;
 import 'dart:io' show Directory, File;

 import 'package:expect/expect.dart' show Expect;
 import 'package:front_end/src/api_prototype/compiler_options.dart'
     show CompilerOptions;
 import 'package:front_end/src/api_prototype/incremental_kernel_generator.dart'
     show IncrementalKernelGenerator;
 import 'package:front_end/src/compute_platform_binaries_location.dart'
     show computePlatformBinariesLocation;
 import 'package:front_end/src/fasta/incremental_compiler.dart'
     show IncrementalCompiler;
 import 'package:front_end/src/fasta/kernel/utils.dart'
     show writeComponentToFile, serializeComponent;
 import "package:front_end/src/api_prototype/memory_file_system.dart"
     show MemoryFileSystem;
 import 'package:kernel/kernel.dart'
     show Class, EmptyStatement, Library, Procedure, Component;

 import 'package:front_end/src/fasta/fasta_codes.dart' show LocatedMessage;

 import 'package:front_end/src/fasta/severity.dart' show Severity;

 Directory outDir;

 main() async {
   await runPassingTest(testDart2jsCompile);
   await runPassingTest(testDisappearingLibrary);
   await runPassingTest(testDeferredLibrary);
   await runPassingTest(testStrongModeMixins);
   await runFailingTest(
       testStrongModeMixins2,
       "testStrongModeMixins2_a.dart: Error: "
       "The parameter 'value' of the method 'A::child' has type");
   await runPassingTest(testInvalidateExportOfMain);
   await runPassingTest(testInvalidatePart);
 }

 void runFailingTest(dynamic test, String expectContains) async {
   try {
     await runPassingTest(test);
     throw "Expected this to fail.";
   } catch (e) {
     if (e.toString().contains(expectContains)) {
       print("got expected error as this test is currently failing");
     } else {
       rethrow;
     }
   }
 }

 void runPassingTest(dynamic test) async {
   outDir =
       Directory.systemTemp.createTempSync("incremental_load_from_dill_test");
   try {
     await test();
     print("----");
   } finally {
     outDir.deleteSync(recursive: true);
   }
 }

 /// Invalidate a part file.
 void testInvalidatePart() async {
   final Uri a = outDir.uri.resolve("testInvalidatePart_a.dart");
   final Uri b = outDir.uri.resolve("testInvalidatePart_b.dart");
   final Uri c = outDir.uri.resolve("testInvalidatePart_c.dart");
   final Uri d = outDir.uri.resolve("testInvalidatePart_d.dart");

   Uri output = outDir.uri.resolve("testInvalidatePart_full.dill");
   Uri bootstrappedOutput =
       outDir.uri.resolve("testInvalidatePart_full_from_bootstrap.dill");

   new File.fromUri(a).writeAsStringSync("""
     library a;
     import 'testInvalidatePart_c.dart';
     part 'testInvalidatePart_b.dart';
     """);
   new File.fromUri(b).writeAsStringSync("""
     part of a;
     b() { print("b"); }
     """);
   new File.fromUri(c).writeAsStringSync("""
     library c;
     part 'testInvalidatePart_d.dart';
     """);
   new File.fromUri(d).writeAsStringSync("""
     part of c;
     d() { print("d"); }
     """);

   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(a, output, options: getOptions(true));
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   stopwatch.reset();
   bool bootstrapResult = await bootstrapCompile(
       a, bootstrappedOutput, output, [b],
       performSizeTests: true, options: getOptions(true));
   print("Bootstrapped compile(s) from ${output.pathSegments.last} "
       "took ${stopwatch.elapsedMilliseconds} ms");
   Expect.isTrue(bootstrapResult);

   // Compare the two files.
   List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
   List<int> bootstrappedDillData =
       new File.fromUri(bootstrappedOutput).readAsBytesSync();
   checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
 }

 /// Invalidate the entrypoint which just exports another file (which has main).
 void testInvalidateExportOfMain() async {
   final Uri a = outDir.uri.resolve("testInvalidateExportOfMain_a.dart");
   final Uri b = outDir.uri.resolve("testInvalidateExportOfMain_b.dart");

   Uri output = outDir.uri.resolve("testInvalidateExportOfMain_full.dill");
   Uri bootstrappedOutput =
       outDir.uri.resolve("testInvalidateExportOfMain_full_from_bootstrap.dill");

   new File.fromUri(a).writeAsStringSync("""
     export 'testInvalidateExportOfMain_b.dart';
     """);
   new File.fromUri(b).writeAsStringSync("""
     main() { print("hello"); }
     """);

   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(a, output, options: getOptions(true));
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   stopwatch.reset();
   bool bootstrapResult = await bootstrapCompile(
       a, bootstrappedOutput, output, [a],
       performSizeTests: true, options: getOptions(true));
   print("Bootstrapped compile(s) from ${output.pathSegments.last} "
       "took ${stopwatch.elapsedMilliseconds} ms");
   Expect.isTrue(bootstrapResult);

   // Compare the two files.
   List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
   List<int> bootstrappedDillData =
       new File.fromUri(bootstrappedOutput).readAsBytesSync();
   checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
 }

 /// Compile in strong mode. Use mixins.
 void testStrongModeMixins2() async {
   final Uri a = outDir.uri.resolve("testStrongModeMixins2_a.dart");
   final Uri b = outDir.uri.resolve("testStrongModeMixins2_b.dart");

   Uri output = outDir.uri.resolve("testStrongModeMixins2_full.dill");
   Uri bootstrappedOutput =
       outDir.uri.resolve("testStrongModeMixins2_full_from_bootstrap.dill");

   new File.fromUri(a).writeAsStringSync("""
     import 'testStrongModeMixins2_b.dart';
     class A extends Object with B<C>, D<Object> {}
     """);
   new File.fromUri(b).writeAsStringSync("""
     abstract class B<ChildType extends Object> extends Object {
       ChildType get child => null;
       set child(ChildType value) {}
     }

     class C extends Object {}

     abstract class D<T extends Object> extends Object with B<T> {}
     """);

   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(a, output, options: getOptions(true));
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   stopwatch.reset();
   bool bootstrapResult = await bootstrapCompile(
       a, bootstrappedOutput, output, [a],
       performSizeTests: true, options: getOptions(true));
   print("Bootstrapped compile(s) from ${output.pathSegments.last} "
       "took ${stopwatch.elapsedMilliseconds} ms");
   Expect.isTrue(bootstrapResult);

   // Compare the two files.
   List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
   List<int> bootstrappedDillData =
       new File.fromUri(bootstrappedOutput).readAsBytesSync();
   checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
 }

 /// Compile in strong mode. Invalidate a file so type inferrer starts
 /// on something compiled from source and (potentially) goes into
 /// something loaded from dill.
 void testStrongModeMixins() async {
   final Uri a = outDir.uri.resolve("testStrongModeMixins_a.dart");
   final Uri b = outDir.uri.resolve("testStrongModeMixins_b.dart");

   Uri output = outDir.uri.resolve("testStrongModeMixins_full.dill");
   Uri bootstrappedOutput =
       outDir.uri.resolve("testStrongModeMixins_full_from_bootstrap.dill");

   new File.fromUri(a).writeAsStringSync("""
     import 'testStrongModeMixins_b.dart';
     class A extends Object with B<Object>, C {}
     """);
   new File.fromUri(b).writeAsStringSync("""
     abstract class C<T extends Object> extends Object with B<T> {}
     abstract class B<ChildType extends Object> extends Object {}
     """);

   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(a, output, options: getOptions(true));
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   stopwatch.reset();
   bool bootstrapResult = await bootstrapCompile(
       a, bootstrappedOutput, output, [a],
       performSizeTests: true, options: getOptions(true));
   print("Bootstrapped compile(s) from ${output.pathSegments.last} "
       "took ${stopwatch.elapsedMilliseconds} ms");
   Expect.isTrue(bootstrapResult);

   // Compare the two files.
   List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
   List<int> bootstrappedDillData =
       new File.fromUri(bootstrappedOutput).readAsBytesSync();
   checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
 }

 /// Test loading from a dill file with a deferred library.
 /// This is done by bootstrapping with no changes.
 void testDeferredLibrary() async {
   final Uri input = outDir.uri.resolve("testDeferredLibrary_main.dart");
   final Uri b = outDir.uri.resolve("testDeferredLibrary_b.dart");
   Uri output = outDir.uri.resolve("testDeferredLibrary_full.dill");
   Uri bootstrappedOutput =
       outDir.uri.resolve("testDeferredLibrary_full_from_bootstrap.dill");
   new File.fromUri(input).writeAsStringSync("""
       import 'testDeferredLibrary_b.dart' deferred as b;

       void main() {
         print(b.foo());
       }
       """);
   new File.fromUri(b).writeAsStringSync("""
       String foo() => "hello from foo in b";
       """);

   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(input, output);
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   stopwatch.reset();
   bool bootstrapResult = await bootstrapCompile(
       input, bootstrappedOutput, output, [],
       performSizeTests: false);
   print("Bootstrapped compile(s) from ${output.pathSegments.last} "
       "took ${stopwatch.elapsedMilliseconds} ms");
   Expect.isTrue(bootstrapResult);

   // Compare the two files.
   List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
   List<int> bootstrappedDillData =
       new File.fromUri(bootstrappedOutput).readAsBytesSync();
   checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
 }

 void testDart2jsCompile() async {
   final Uri dart2jsUrl = Uri.base.resolve("pkg/compiler/bin/dart2js.dart");
   final Uri invalidateUri = Uri.parse("package:compiler/src/filenames.dart");
   Uri normalDill = outDir.uri.resolve("dart2js.full.dill");
   Uri bootstrappedDill = outDir.uri.resolve("dart2js.bootstrap.dill");
   Uri nonexisting = outDir.uri.resolve("dart2js.nonexisting.dill");
   Uri nonLoadable = outDir.uri.resolve("dart2js.nonloadable.dill");

   // Compile dart2js without bootstrapping.
   Stopwatch stopwatch = new Stopwatch()..start();
   await normalCompile(dart2jsUrl, normalDill);
   print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

   // Create a file that cannot be (fully) loaded as a dill file.
   List<int> corruptData = new File.fromUri(normalDill).readAsBytesSync();
   for (int i = 10 * (corruptData.length ~/ 16);
       i < 15 * (corruptData.length ~/ 16);
       ++i) {
     corruptData[i] = 42;
   }
   new File.fromUri(nonLoadable).writeAsBytesSync(corruptData);

   // Compile dart2js, bootstrapping from the just-compiled dill,
   // a nonexisting file and a dill file that isn't valid.
   for (List<Object> bootstrapData in [
     [normalDill, true],
     [nonexisting, false],
     //  [nonLoadable, false] // disabled for now
   ]) {
     Uri bootstrapWith = bootstrapData[0];
     bool bootstrapExpect = bootstrapData[1];
     stopwatch.reset();
     bool bootstrapResult = await bootstrapCompile(
         dart2jsUrl, bootstrappedDill, bootstrapWith, [invalidateUri]);
     Expect.equals(bootstrapExpect, bootstrapResult);
     print("Bootstrapped compile(s) from ${bootstrapWith.pathSegments.last} "
         "took ${stopwatch.elapsedMilliseconds} ms");

     // Compare the two files.
     List<int> normalDillData = new File.fromUri(normalDill).readAsBytesSync();
     List<int> bootstrappedDillData =
         new File.fromUri(bootstrappedDill).readAsBytesSync();
     checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
   }
 }

 void checkBootstrappedIsEqual(
     List<int> normalDillData, List<int> bootstrappedDillData) {
   Expect.equals(normalDillData.length, bootstrappedDillData.length);
   for (int i = 0; i < normalDillData.length; ++i) {
     if (normalDillData[i] != bootstrappedDillData[i]) {
       Expect.fail("Normally compiled and bootstrapped compile differs.");
     }
   }
 }

 /// Compile an application with n libraries, then
 /// compile "the same" application, but with m < n libraries,
 /// where (at least one) of the missing libraries are "in the middle"
 /// of the library list ---  bootstrapping from the dill with n libarries.
 void testDisappearingLibrary() async {
   final Uri base = Uri.parse("org-dartlang-test:///");
   final Uri sdkSummary = base.resolve("vm_platform.dill");
   final Uri main = base.resolve("main.dart");
   final Uri b = base.resolve("b.dart");
   final Uri bootstrap = base.resolve("bootstrapFrom.dill");
   final List<int> sdkSummaryData = await new File.fromUri(
           computePlatformBinariesLocation().resolve("vm_platform.dill"))
       .readAsBytes();

   List<int> libCount2;
   {
     MemoryFileSystem fs = new MemoryFileSystem(base);
     fs.entityForUri(sdkSummary).writeAsBytesSync(sdkSummaryData);

     fs.entityForUri(main).writeAsStringSync("""
       library mainLibrary;
       import "b.dart" as b;

       main() {
         b.foo();
       }
       """);

     fs.entityForUri(b).writeAsStringSync("""
       library bLibrary;

       foo() {
         print("hello from b.dart foo!");
       }
       """);

     CompilerOptions options = getOptions(false);
     options.fileSystem = fs;
     options.sdkRoot = null;
     options.sdkSummary = sdkSummary;
     IncrementalCompiler compiler =
         new IncrementalKernelGenerator(options, main);
     Stopwatch stopwatch = new Stopwatch()..start();
     var component = await compiler.computeDelta();
     throwOnEmptyMixinBodies(component);
     print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");
     libCount2 = serializeComponent(component);
     if (component.libraries.length != 2) {
       throw "Expected 2 libraries, got ${component.libraries.length}";
     }
     if (component.libraries[0].fileUri != main) {
       throw "Expected the first library to have uri $main but was "
           "${component.libraries[0].fileUri}";
     }
   }

   {
     MemoryFileSystem fs = new MemoryFileSystem(base);
     fs.entityForUri(sdkSummary).writeAsBytesSync(sdkSummaryData);
     fs.entityForUri(bootstrap).writeAsBytesSync(libCount2);
     fs.entityForUri(b).writeAsStringSync("""
       library bLibrary;

       main() {
         print("hello from b!");
       }
       """);
     CompilerOptions options = getOptions(false);
     options.fileSystem = fs;
     options.sdkRoot = null;
     options.sdkSummary = sdkSummary;
     IncrementalCompiler compiler =
         new IncrementalKernelGenerator(options, b, bootstrap);
     compiler.invalidate(main);
     compiler.invalidate(b);
     Stopwatch stopwatch = new Stopwatch()..start();
     var component = await compiler.computeDelta();
     throwOnEmptyMixinBodies(component);
     print("Bootstrapped compile took ${stopwatch.elapsedMilliseconds} ms");
     if (component.libraries.length != 1) {
       throw "Expected 1 library, got ${component.libraries.length}";
     }
   }
 }

 CompilerOptions getOptions(bool strong) {
   final Uri sdkRoot = computePlatformBinariesLocation();
   var options = new CompilerOptions()
     ..sdkRoot = sdkRoot
     ..librariesSpecificationUri = Uri.base.resolve("sdk/lib/libraries.json")
     ..onProblem = (LocatedMessage message, Severity severity, String formatted,
         int line, int column) {
       if (severity == Severity.error || severity == Severity.warning) {
         Expect.fail("Unexpected error: $formatted");
       }
     }
     ..strongMode = strong;
   if (strong) {
     options.sdkSummary =
         computePlatformBinariesLocation().resolve("vm_platform_strong.dill");
   } else {
     options.sdkSummary =
         computePlatformBinariesLocation().resolve("vm_platform.dill");
   }
   return options;
 }

 Future<bool> normalCompile(Uri input, Uri output,
     {CompilerOptions options}) async {
   options ??= getOptions(false);
   IncrementalCompiler compiler = new IncrementalKernelGenerator(options, input);
   var component = await compiler.computeDelta();
   throwOnEmptyMixinBodies(component);
   await writeComponentToFile(component, output);
   return compiler.initializedFromDill;
 }

 void throwOnEmptyMixinBodies(Component component) {
   int empty = countEmptyMixinBodies(component);
   if (empty != 0) {
     throw "Expected 0 empty bodies in mixins, but found $empty";
   }
 }

 int countEmptyMixinBodies(Component component) {
   int empty = 0;
   for (Library lib in component.libraries) {
     for (Class c in lib.classes) {
       if (c.isSyntheticMixinImplementation) {
         // Assume mixin
         for (Procedure p in c.procedures) {
           if (p.function.body is EmptyStatement) {
             empty++;
           }
         }
       }
     }
   }
   return empty;
 }

 Future<bool> bootstrapCompile(
     Uri input, Uri output, Uri bootstrapWith, List<Uri> invalidateUris,
     {bool performSizeTests: true, CompilerOptions options}) async {
   options ??= getOptions(false);
   IncrementalCompiler compiler =
       new IncrementalKernelGenerator(options, input, bootstrapWith);
   for (Uri invalidateUri in invalidateUris) {
     compiler.invalidate(invalidateUri);
   }
   var bootstrappedProgram = await compiler.computeDelta();
   throwOnEmptyMixinBodies(bootstrappedProgram);
   bool result = compiler.initializedFromDill;
   await writeComponentToFile(bootstrappedProgram, output);
   for (Uri invalidateUri in invalidateUris) {
     compiler.invalidate(invalidateUri);
   }

   var partialProgram = await compiler.computeDelta();
   throwOnEmptyMixinBodies(partialProgram);
   var emptyProgram = await compiler.computeDelta();
   throwOnEmptyMixinBodies(emptyProgram);

   var fullLibUris =
       bootstrappedProgram.libraries.map((lib) => lib.importUri).toList();
   var partialLibUris =
       partialProgram.libraries.map((lib) => lib.importUri).toList();
   var emptyLibUris =
       emptyProgram.libraries.map((lib) => lib.importUri).toList();

   if (performSizeTests) {
     Expect.isTrue(fullLibUris.length > partialLibUris.length);
     Expect.isTrue(partialLibUris.isNotEmpty);
     Expect.isTrue(emptyLibUris.isEmpty);
   }

   return result;
 }
	// Copyright (c) 2018, 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:async' show Future;
	import 'dart:io' show Directory, File;

	import 'package:expect/expect.dart' show Expect;
	import 'package:front_end/src/api_prototype/compiler_options.dart'
	show CompilerOptions;
	import 'package:front_end/src/api_prototype/incremental_kernel_generator.dart'
	show IncrementalKernelGenerator;
	import 'package:front_end/src/compute_platform_binaries_location.dart'
	show computePlatformBinariesLocation;
	import 'package:front_end/src/fasta/incremental_compiler.dart'
	show IncrementalCompiler;
	import 'package:front_end/src/fasta/kernel/utils.dart'
	show writeComponentToFile, serializeComponent;
	import "package:front_end/src/api_prototype/memory_file_system.dart"
	show MemoryFileSystem;
	import 'package:kernel/kernel.dart'
	show Class, EmptyStatement, Library, Procedure, Component;

	import 'package:front_end/src/fasta/fasta_codes.dart' show LocatedMessage;

	import 'package:front_end/src/fasta/severity.dart' show Severity;

	Directory outDir;

	main() async {
	await runPassingTest(testDart2jsCompile);
	await runPassingTest(testDisappearingLibrary);
	await runPassingTest(testDeferredLibrary);
	await runPassingTest(testStrongModeMixins);
	await runFailingTest(
	testStrongModeMixins2,
	"testStrongModeMixins2_a.dart: Error: "
	"The parameter 'value' of the method 'A::child' has type");
	await runPassingTest(testInvalidateExportOfMain);
	await runPassingTest(testInvalidatePart);
	}

	void runFailingTest(dynamic test, String expectContains) async {
	try {
	await runPassingTest(test);
	throw "Expected this to fail.";
	} catch (e) {
	if (e.toString().contains(expectContains)) {
	print("got expected error as this test is currently failing");
	} else {
	rethrow;
	}
	}
	}

	void runPassingTest(dynamic test) async {
	outDir =
	Directory.systemTemp.createTempSync("incremental_load_from_dill_test");
	try {
	await test();
	print("----");
	} finally {
	outDir.deleteSync(recursive: true);
	}
	}

	/// Invalidate a part file.
	void testInvalidatePart() async {
	final Uri a = outDir.uri.resolve("testInvalidatePart_a.dart");
	final Uri b = outDir.uri.resolve("testInvalidatePart_b.dart");
	final Uri c = outDir.uri.resolve("testInvalidatePart_c.dart");
	final Uri d = outDir.uri.resolve("testInvalidatePart_d.dart");

	Uri output = outDir.uri.resolve("testInvalidatePart_full.dill");
	Uri bootstrappedOutput =
	outDir.uri.resolve("testInvalidatePart_full_from_bootstrap.dill");

	new File.fromUri(a).writeAsStringSync("""
	library a;
	import 'testInvalidatePart_c.dart';
	part 'testInvalidatePart_b.dart';
	""");
	new File.fromUri(b).writeAsStringSync("""
	part of a;
	b() { print("b"); }
	""");
	new File.fromUri(c).writeAsStringSync("""
	library c;
	part 'testInvalidatePart_d.dart';
	""");
	new File.fromUri(d).writeAsStringSync("""
	part of c;
	d() { print("d"); }
	""");

	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(a, output, options: getOptions(true));
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	a, bootstrappedOutput, output, [b],
	performSizeTests: true, options: getOptions(true));
	print("Bootstrapped compile(s) from ${output.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");
	Expect.isTrue(bootstrapResult);

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedOutput).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}

	/// Invalidate the entrypoint which just exports another file (which has main).
	void testInvalidateExportOfMain() async {
	final Uri a = outDir.uri.resolve("testInvalidateExportOfMain_a.dart");
	final Uri b = outDir.uri.resolve("testInvalidateExportOfMain_b.dart");

	Uri output = outDir.uri.resolve("testInvalidateExportOfMain_full.dill");
	Uri bootstrappedOutput =
	outDir.uri.resolve("testInvalidateExportOfMain_full_from_bootstrap.dill");

	new File.fromUri(a).writeAsStringSync("""
	export 'testInvalidateExportOfMain_b.dart';
	""");
	new File.fromUri(b).writeAsStringSync("""
	main() { print("hello"); }
	""");

	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(a, output, options: getOptions(true));
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	a, bootstrappedOutput, output, [a],
	performSizeTests: true, options: getOptions(true));
	print("Bootstrapped compile(s) from ${output.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");
	Expect.isTrue(bootstrapResult);

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedOutput).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}

	/// Compile in strong mode. Use mixins.
	void testStrongModeMixins2() async {
	final Uri a = outDir.uri.resolve("testStrongModeMixins2_a.dart");
	final Uri b = outDir.uri.resolve("testStrongModeMixins2_b.dart");

	Uri output = outDir.uri.resolve("testStrongModeMixins2_full.dill");
	Uri bootstrappedOutput =
	outDir.uri.resolve("testStrongModeMixins2_full_from_bootstrap.dill");

	new File.fromUri(a).writeAsStringSync("""
	import 'testStrongModeMixins2_b.dart';
	class A extends Object with B<C>, D<Object> {}
	""");
	new File.fromUri(b).writeAsStringSync("""
	abstract class B<ChildType extends Object> extends Object {
	ChildType get child => null;
	set child(ChildType value) {}
	}

	class C extends Object {}

	abstract class D<T extends Object> extends Object with B<T> {}
	""");

	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(a, output, options: getOptions(true));
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	a, bootstrappedOutput, output, [a],
	performSizeTests: true, options: getOptions(true));
	print("Bootstrapped compile(s) from ${output.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");
	Expect.isTrue(bootstrapResult);

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedOutput).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}

	/// Compile in strong mode. Invalidate a file so type inferrer starts
	/// on something compiled from source and (potentially) goes into
	/// something loaded from dill.
	void testStrongModeMixins() async {
	final Uri a = outDir.uri.resolve("testStrongModeMixins_a.dart");
	final Uri b = outDir.uri.resolve("testStrongModeMixins_b.dart");

	Uri output = outDir.uri.resolve("testStrongModeMixins_full.dill");
	Uri bootstrappedOutput =
	outDir.uri.resolve("testStrongModeMixins_full_from_bootstrap.dill");

	new File.fromUri(a).writeAsStringSync("""
	import 'testStrongModeMixins_b.dart';
	class A extends Object with B<Object>, C {}
	""");
	new File.fromUri(b).writeAsStringSync("""
	abstract class C<T extends Object> extends Object with B<T> {}
	abstract class B<ChildType extends Object> extends Object {}
	""");

	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(a, output, options: getOptions(true));
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	a, bootstrappedOutput, output, [a],
	performSizeTests: true, options: getOptions(true));
	print("Bootstrapped compile(s) from ${output.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");
	Expect.isTrue(bootstrapResult);

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedOutput).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}

	/// Test loading from a dill file with a deferred library.
	/// This is done by bootstrapping with no changes.
	void testDeferredLibrary() async {
	final Uri input = outDir.uri.resolve("testDeferredLibrary_main.dart");
	final Uri b = outDir.uri.resolve("testDeferredLibrary_b.dart");
	Uri output = outDir.uri.resolve("testDeferredLibrary_full.dill");
	Uri bootstrappedOutput =
	outDir.uri.resolve("testDeferredLibrary_full_from_bootstrap.dill");
	new File.fromUri(input).writeAsStringSync("""
	import 'testDeferredLibrary_b.dart' deferred as b;

	void main() {
	print(b.foo());
	}
	""");
	new File.fromUri(b).writeAsStringSync("""
	String foo() => "hello from foo in b";
	""");

	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(input, output);
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	input, bootstrappedOutput, output, [],
	performSizeTests: false);
	print("Bootstrapped compile(s) from ${output.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");
	Expect.isTrue(bootstrapResult);

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(output).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedOutput).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}

	void testDart2jsCompile() async {
	final Uri dart2jsUrl = Uri.base.resolve("pkg/compiler/bin/dart2js.dart");
	final Uri invalidateUri = Uri.parse("package:compiler/src/filenames.dart");
	Uri normalDill = outDir.uri.resolve("dart2js.full.dill");
	Uri bootstrappedDill = outDir.uri.resolve("dart2js.bootstrap.dill");
	Uri nonexisting = outDir.uri.resolve("dart2js.nonexisting.dill");
	Uri nonLoadable = outDir.uri.resolve("dart2js.nonloadable.dill");

	// Compile dart2js without bootstrapping.
	Stopwatch stopwatch = new Stopwatch()..start();
	await normalCompile(dart2jsUrl, normalDill);
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");

	// Create a file that cannot be (fully) loaded as a dill file.
	List<int> corruptData = new File.fromUri(normalDill).readAsBytesSync();
	for (int i = 10 * (corruptData.length ~/ 16);
	i < 15 * (corruptData.length ~/ 16);
	++i) {
	corruptData[i] = 42;
	}
	new File.fromUri(nonLoadable).writeAsBytesSync(corruptData);

	// Compile dart2js, bootstrapping from the just-compiled dill,
	// a nonexisting file and a dill file that isn't valid.
	for (List<Object> bootstrapData in [
	[normalDill, true],
	[nonexisting, false],
	// [nonLoadable, false] // disabled for now
	]) {
	Uri bootstrapWith = bootstrapData[0];
	bool bootstrapExpect = bootstrapData[1];
	stopwatch.reset();
	bool bootstrapResult = await bootstrapCompile(
	dart2jsUrl, bootstrappedDill, bootstrapWith, [invalidateUri]);
	Expect.equals(bootstrapExpect, bootstrapResult);
	print("Bootstrapped compile(s) from ${bootstrapWith.pathSegments.last} "
	"took ${stopwatch.elapsedMilliseconds} ms");

	// Compare the two files.
	List<int> normalDillData = new File.fromUri(normalDill).readAsBytesSync();
	List<int> bootstrappedDillData =
	new File.fromUri(bootstrappedDill).readAsBytesSync();
	checkBootstrappedIsEqual(normalDillData, bootstrappedDillData);
	}
	}

	void checkBootstrappedIsEqual(
	List<int> normalDillData, List<int> bootstrappedDillData) {
	Expect.equals(normalDillData.length, bootstrappedDillData.length);
	for (int i = 0; i < normalDillData.length; ++i) {
	if (normalDillData[i] != bootstrappedDillData[i]) {
	Expect.fail("Normally compiled and bootstrapped compile differs.");
	}
	}
	}

	/// Compile an application with n libraries, then
	/// compile "the same" application, but with m < n libraries,
	/// where (at least one) of the missing libraries are "in the middle"
	/// of the library list --- bootstrapping from the dill with n libarries.
	void testDisappearingLibrary() async {
	final Uri base = Uri.parse("org-dartlang-test:///");
	final Uri sdkSummary = base.resolve("vm_platform.dill");
	final Uri main = base.resolve("main.dart");
	final Uri b = base.resolve("b.dart");
	final Uri bootstrap = base.resolve("bootstrapFrom.dill");
	final List<int> sdkSummaryData = await new File.fromUri(
	computePlatformBinariesLocation().resolve("vm_platform.dill"))
	.readAsBytes();

	List<int> libCount2;
	{
	MemoryFileSystem fs = new MemoryFileSystem(base);
	fs.entityForUri(sdkSummary).writeAsBytesSync(sdkSummaryData);

	fs.entityForUri(main).writeAsStringSync("""
	library mainLibrary;
	import "b.dart" as b;

	main() {
	b.foo();
	}
	""");

	fs.entityForUri(b).writeAsStringSync("""
	library bLibrary;

	foo() {
	print("hello from b.dart foo!");
	}
	""");

	CompilerOptions options = getOptions(false);
	options.fileSystem = fs;
	options.sdkRoot = null;
	options.sdkSummary = sdkSummary;
	IncrementalCompiler compiler =
	new IncrementalKernelGenerator(options, main);
	Stopwatch stopwatch = new Stopwatch()..start();
	var component = await compiler.computeDelta();
	throwOnEmptyMixinBodies(component);
	print("Normal compile took ${stopwatch.elapsedMilliseconds} ms");
	libCount2 = serializeComponent(component);
	if (component.libraries.length != 2) {
	throw "Expected 2 libraries, got ${component.libraries.length}";
	}
	if (component.libraries[0].fileUri != main) {
	throw "Expected the first library to have uri $main but was "
	"${component.libraries[0].fileUri}";
	}
	}

	{
	MemoryFileSystem fs = new MemoryFileSystem(base);
	fs.entityForUri(sdkSummary).writeAsBytesSync(sdkSummaryData);
	fs.entityForUri(bootstrap).writeAsBytesSync(libCount2);
	fs.entityForUri(b).writeAsStringSync("""
	library bLibrary;

	main() {
	print("hello from b!");
	}
	""");
	CompilerOptions options = getOptions(false);
	options.fileSystem = fs;
	options.sdkRoot = null;
	options.sdkSummary = sdkSummary;
	IncrementalCompiler compiler =
	new IncrementalKernelGenerator(options, b, bootstrap);
	compiler.invalidate(main);
	compiler.invalidate(b);
	Stopwatch stopwatch = new Stopwatch()..start();
	var component = await compiler.computeDelta();
	throwOnEmptyMixinBodies(component);
	print("Bootstrapped compile took ${stopwatch.elapsedMilliseconds} ms");
	if (component.libraries.length != 1) {
	throw "Expected 1 library, got ${component.libraries.length}";
	}
	}
	}

	CompilerOptions getOptions(bool strong) {
	final Uri sdkRoot = computePlatformBinariesLocation();
	var options = new CompilerOptions()
	..sdkRoot = sdkRoot
	..librariesSpecificationUri = Uri.base.resolve("sdk/lib/libraries.json")
	..onProblem = (LocatedMessage message, Severity severity, String formatted,
	int line, int column) {
	if (severity == Severity.error \|\| severity == Severity.warning) {
	Expect.fail("Unexpected error: $formatted");
	}
	}
	..strongMode = strong;
	if (strong) {
	options.sdkSummary =
	computePlatformBinariesLocation().resolve("vm_platform_strong.dill");
	} else {
	options.sdkSummary =
	computePlatformBinariesLocation().resolve("vm_platform.dill");
	}
	return options;
	}

	Future<bool> normalCompile(Uri input, Uri output,
	{CompilerOptions options}) async {
	options ??= getOptions(false);
	IncrementalCompiler compiler = new IncrementalKernelGenerator(options, input);
	var component = await compiler.computeDelta();
	throwOnEmptyMixinBodies(component);
	await writeComponentToFile(component, output);
	return compiler.initializedFromDill;
	}

	void throwOnEmptyMixinBodies(Component component) {
	int empty = countEmptyMixinBodies(component);
	if (empty != 0) {
	throw "Expected 0 empty bodies in mixins, but found $empty";
	}
	}

	int countEmptyMixinBodies(Component component) {
	int empty = 0;
	for (Library lib in component.libraries) {
	for (Class c in lib.classes) {
	if (c.isSyntheticMixinImplementation) {
	// Assume mixin
	for (Procedure p in c.procedures) {
	if (p.function.body is EmptyStatement) {
	empty++;
	}
	}
	}
	}
	}
	return empty;
	}

	Future<bool> bootstrapCompile(
	Uri input, Uri output, Uri bootstrapWith, List<Uri> invalidateUris,
	{bool performSizeTests: true, CompilerOptions options}) async {
	options ??= getOptions(false);
	IncrementalCompiler compiler =
	new IncrementalKernelGenerator(options, input, bootstrapWith);
	for (Uri invalidateUri in invalidateUris) {
	compiler.invalidate(invalidateUri);
	}
	var bootstrappedProgram = await compiler.computeDelta();
	throwOnEmptyMixinBodies(bootstrappedProgram);
	bool result = compiler.initializedFromDill;
	await writeComponentToFile(bootstrappedProgram, output);
	for (Uri invalidateUri in invalidateUris) {
	compiler.invalidate(invalidateUri);
	}

	var partialProgram = await compiler.computeDelta();
	throwOnEmptyMixinBodies(partialProgram);
	var emptyProgram = await compiler.computeDelta();
	throwOnEmptyMixinBodies(emptyProgram);

	var fullLibUris =
	bootstrappedProgram.libraries.map((lib) => lib.importUri).toList();
	var partialLibUris =
	partialProgram.libraries.map((lib) => lib.importUri).toList();
	var emptyLibUris =
	emptyProgram.libraries.map((lib) => lib.importUri).toList();

	if (performSizeTests) {
	Expect.isTrue(fullLibUris.length > partialLibUris.length);
	Expect.isTrue(partialLibUris.isNotEmpty);
	Expect.isTrue(emptyLibUris.isEmpty);
	}

	return result;
	}