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Side by Side 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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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 library deferred_load;
6
7 import 'dart:uri';
8
9 import 'dart2jslib.dart'
10 show Compiler,
11 CompilerTask,
12 ConstructedConstant,
13 SourceString;
14
15 import 'elements/elements.dart'
16 show ClassElement,
17 Element,
18 LibraryElement,
19 MetadataAnnotation;
20
21 import 'util/util.dart'
22 show Link;
23
24 import 'tree/tree.dart'
25 show LibraryTag;
26
27 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.
28 final Set<LibraryElement> deferredLibraries = new Set<LibraryElement>();
29
30 ClassElement cachedDeferredLibraryClass;
31
32 DeferredLoadTask(Compiler compiler) : super(compiler);
33
34 String get name => 'Lazy';
35
36 /// DeferredLibrary from dart:async
37 ClassElement get deferredLibraryClass {
38 if (cachedDeferredLibraryClass == null) {
39 cachedDeferredLibraryClass = findDeferredLibraryClass();
40 }
41 return cachedDeferredLibraryClass;
42 }
43
44 ClassElement findDeferredLibraryClass() {
45 var uri = new Uri.fromComponents(scheme: 'dart', path: 'async');
46 LibraryElement asyncLibrary =
47 compiler.libraryLoader.loadLibrary(uri, null, uri);
48 var element = asyncLibrary.find(const SourceString('DeferredLibrary'));
49 if (element == null) {
50 internalErrorOnElement(
51 asyncLibrary,
52 'dart:async library does not contain required class: '
53 'DeferredLibrary');
54 }
55 return element;
56 }
57
58 bool isDeferred(Element element) {
59 // TODO(ahe): This is really a graph coloring problem. We should
60 // make sure that libraries and elements only used by a deferred
61 // library are also deferred.
62 // Also, if something is deferred depends on your
63 // perspective. Inside a deferred library, other elements of the
64 // same library are not deferred. We should add an extra parameter
65 // to this method to indicate "from where".
66 return deferredLibraries.contains(element.getLibrary());
67 }
68
69 void registerMainApp(LibraryElement mainApp) {
70 if (mainApp == null) return;
71 compiler.withCurrentElement(mainApp, () {
72 deferredLibraries.addAll(findDeferredLibraries(mainApp));
73 });
74 }
75
76 Link<Element> findDeferredLibraries(LibraryElement library) {
77 Link<LibraryElement> link = const Link<LibraryElement>();
78 for (LibraryTag tag in library.tags) {
79 Link<MetadataAnnotation> metadata = tag.metadata;
80 if (metadata == null) continue;
81 for (MetadataAnnotation metadata in tag.metadata) {
82 metadata.ensureResolved(compiler);
83 Element element = metadata.value.computeType(compiler).element;
84 if (element == deferredLibraryClass) {
85 ConstructedConstant value = metadata.value;
86 SourceString expectedName = value.fields[0].toDartString().source;
87 LibraryElement deferredLibrary = library.getLibraryFromTag(tag);
88 link = link.prepend(deferredLibrary);
89 SourceString actualName =
90 new SourceString(deferredLibrary.getLibraryOrScriptName());
91 if (expectedName != actualName) {
92 compiler.reportErrorCode(
93 metadata,
94 MessageKind.DEFERRED_LIBRARY_NAME_MISMATCH,
95 { 'expectedName': expectedName.slowToString(),
96 'actualName': actualName.slowToString()});
97 }
98 }
99 }
100 }
101 return link;
102 }
103 }
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