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Unified Diff: dart/sdk/lib/_internal/compiler/implementation/deferred_load.dart

Issue 12033003: Deferred (aka lazy) loading of static functions. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge
Patch Set: Missing imports Created 7 years, 10 months ago
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Index: dart/sdk/lib/_internal/compiler/implementation/deferred_load.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/deferred_load.dart b/dart/sdk/lib/_internal/compiler/implementation/deferred_load.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7753fb4e0d48888b434f63d6f72121ee87ed295f
--- /dev/null
+++ b/dart/sdk/lib/_internal/compiler/implementation/deferred_load.dart
@@ -0,0 +1,103 @@
+// Copyright (c) 2013, 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 deferred_load;
+
+import 'dart:uri';
+
+import 'dart2jslib.dart'
+ show Compiler,
+ CompilerTask,
+ ConstructedConstant,
+ SourceString;
+
+import 'elements/elements.dart'
+ show ClassElement,
+ Element,
+ LibraryElement,
+ MetadataAnnotation;
+
+import 'util/util.dart'
+ show Link;
+
+import 'tree/tree.dart'
+ show LibraryTag;
+
+class DeferredLoadTask extends CompilerTask {
ngeoffray 2013/02/19 10:04:57 Is there some time you would like to measure for t
ahe 2013/02/19 11:10:36 Done.
+ final Set<LibraryElement> deferredLibraries = new Set<LibraryElement>();
+
+ ClassElement cachedDeferredLibraryClass;
+
+ DeferredLoadTask(Compiler compiler) : super(compiler);
+
+ String get name => 'Lazy';
+
+ /// DeferredLibrary from dart:async
+ ClassElement get deferredLibraryClass {
+ if (cachedDeferredLibraryClass == null) {
+ cachedDeferredLibraryClass = findDeferredLibraryClass();
+ }
+ return cachedDeferredLibraryClass;
+ }
+
+ ClassElement findDeferredLibraryClass() {
+ var uri = new Uri.fromComponents(scheme: 'dart', path: 'async');
+ LibraryElement asyncLibrary =
+ compiler.libraryLoader.loadLibrary(uri, null, uri);
+ var element = asyncLibrary.find(const SourceString('DeferredLibrary'));
+ if (element == null) {
+ internalErrorOnElement(
+ asyncLibrary,
+ 'dart:async library does not contain required class: '
+ 'DeferredLibrary');
+ }
+ return element;
+ }
+
+ bool isDeferred(Element element) {
+ // TODO(ahe): This is really a graph coloring problem. We should
+ // make sure that libraries and elements only used by a deferred
+ // library are also deferred.
+ // Also, if something is deferred depends on your
+ // perspective. Inside a deferred library, other elements of the
+ // same library are not deferred. We should add an extra parameter
+ // to this method to indicate "from where".
+ return deferredLibraries.contains(element.getLibrary());
+ }
+
+ void registerMainApp(LibraryElement mainApp) {
+ if (mainApp == null) return;
+ compiler.withCurrentElement(mainApp, () {
+ deferredLibraries.addAll(findDeferredLibraries(mainApp));
+ });
+ }
+
+ Link<Element> findDeferredLibraries(LibraryElement library) {
+ Link<LibraryElement> link = const Link<LibraryElement>();
+ for (LibraryTag tag in library.tags) {
+ Link<MetadataAnnotation> metadata = tag.metadata;
+ if (metadata == null) continue;
+ for (MetadataAnnotation metadata in tag.metadata) {
+ metadata.ensureResolved(compiler);
+ Element element = metadata.value.computeType(compiler).element;
+ if (element == deferredLibraryClass) {
+ ConstructedConstant value = metadata.value;
+ SourceString expectedName = value.fields[0].toDartString().source;
+ LibraryElement deferredLibrary = library.getLibraryFromTag(tag);
+ link = link.prepend(deferredLibrary);
+ SourceString actualName =
+ new SourceString(deferredLibrary.getLibraryOrScriptName());
+ if (expectedName != actualName) {
+ compiler.reportErrorCode(
+ metadata,
+ MessageKind.DEFERRED_LIBRARY_NAME_MISMATCH,
+ { 'expectedName': expectedName.slowToString(),
+ 'actualName': actualName.slowToString()});
+ }
+ }
+ }
+ }
+ return link;
+ }
+}

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