Support per-library serialization.

tests/compiler/dart2js/serialization_library_test.dart

Index: tests/compiler/dart2js/serialization_library_test.dart
diff --git a/tests/compiler/dart2js/serialization_library_test.dart b/tests/compiler/dart2js/serialization_library_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6c1644b61cb6cd71e56de56529398309598b8bd5
--- /dev/null
+++ b/tests/compiler/dart2js/serialization_library_test.dart
@@ -0,0 +1,130 @@
+// 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.serialization_test;
+
+import 'dart:io';
+import 'memory_compiler.dart';
+import 'package:async_helper/async_helper.dart';
+import 'package:compiler/src/commandline_options.dart';
+import 'package:compiler/src/common/names.dart';
+import 'package:compiler/src/constants/constructors.dart';
+import 'package:compiler/src/constants/expressions.dart';
+import 'package:compiler/src/dart_types.dart';
+import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/diagnostics/invariant.dart';
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/elements/visitor.dart';
+import 'package:compiler/src/ordered_typeset.dart';
+import 'package:compiler/src/serialization/element_serialization.dart';
+import 'package:compiler/src/serialization/json_serializer.dart';
+import 'package:compiler/src/serialization/serialization.dart';
+
+import 'serialization_test.dart';
+
+main(List<String> arguments) {
+  // Ensure that we can print out constant expressions.
+  DEBUG_MODE = true;
+
+  Uri entryPoint;
+  String outPath;
+  int shardCount = 3;
+  bool prettyPrint = false;
+  for (String arg in arguments) {
+    if (arg.startsWith('--')) {
+      if (arg.startsWith('--out=')) {
+        outPath = arg.substring('--out='.length);
+      } else if (arg == '--pretty-print') {
+        prettyPrint = true;
+      } else if (arg.startsWith('--shards=')) {
+        shardCount = int.parse(arg.substring('--shards='.length));
+      } else {
+        print("Unknown option $arg");
+      }
+    } else {
+      if (entryPoint != null) {
+        print("Multiple entrypoints are not supported.");
+      }
+      entryPoint = Uri.parse(arg);
+    }
+  }
+  if (entryPoint == null) {
+    entryPoint = Uris.dart_core;
+  }
+  asyncTest(() async {
+    CompilationResult result = await runCompiler(
+        entryPoint: entryPoint, options: [Flags.analyzeAll]);
+    Compiler compiler = result.compiler;
+    testSerialization(compiler.libraryLoader.libraries,
+                      outPath: outPath,
+                      prettyPrint: prettyPrint,
+                      shardCount: shardCount);
+  });
+}
+
+void testSerialization(Iterable<LibraryElement> libraries1,
+                       {String outPath,
+                        bool prettyPrint,
+                        int shardCount: 3}) {
+  if (shardCount < 1 || shardCount > libraries1.length) {
+    shardCount = libraries1.length;
+  }
+  List<List<LibraryElement>> librarySplits = <List<LibraryElement>>[];
+  int offset = 0;
+  int shardSize = (libraries1.length / shardCount).ceil();
+  for (int shard = 0; shard < shardCount; shard++) {
+    List<LibraryElement> libraries = <LibraryElement>[];
+    for (int index = 0; index < shardSize; index++) {
+      if (offset + index < libraries1.length) {
+        libraries.add(libraries1.elementAt(offset + index));
+      }
+    }
+    librarySplits.add(libraries);
+    offset += shardSize;
+  }
+  print(librarySplits.join('\n'));
+  List<String> texts = <String>[];
+  for (int shard = 0; shard < shardCount; shard++) {
+    List<LibraryElement> libraries = librarySplits[shard];
+    Serializer serializer = new Serializer(
+        shouldInclude: (e) => libraries.contains(e.library));
+    for (LibraryElement library in libraries) {
+      serializer.serialize(library);
+    }
+    String text = serializer.toText(const JsonSerializationEncoder());
+    String outText = text;
+    if (prettyPrint) {
+      outText = serializer.prettyPrint();
+    }
+    if (outPath != null) {
+      String name = outPath;
+      String ext = '';
+      int dotPos = outPath.lastIndexOf('.');
+      if (dotPos != -1) {
+        name = outPath.substring(0, dotPos);
+        ext = outPath.substring(dotPos);
+      }
+      new File('$name$shard$ext').writeAsStringSync(outText);
+    } else if (prettyPrint) {
+      print(outText);
+    }
+    texts.add(text);
+  }
+  DeserializationContext deserializationContext =
+      new DeserializationContext();
+  for (int shard = 0; shard < shardCount; shard++) {
+    new Deserializer.fromText(
+        deserializationContext, texts[shard], const JsonSerializationDecoder());
+  }
+  List<LibraryElement> libraries2 = <LibraryElement>[];
+  for (LibraryElement library1 in libraries1) {
+    LibraryElement library2 =
+        deserializationContext.lookupLibrary(library1.canonicalUri);
+    if (library2 == null) {
+      throw new ArgumentError('No library ${library1.canonicalUri} found.');
+    }
+    checkLibraryContent('library1', 'library2', 'library', library1, library2);
+    libraries2.add(library2);
+  }
+}