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Side by Side Diff: pkg/compiler/lib/src/js_emitter/registry.dart

Issue 693183006: Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler" (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 1 month ago
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1 // Copyright (c) 2014, 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 part of dart2js.js_emitter.program_builder;
6
7 /// A Fragment maps [LibraryElement]s to their [Element]s.
8 ///
9 /// Fundamentally, this class nicely encapsulates a
10 /// `Map<LibraryElement, List<Element>>`.
11 class Fragment {
12 final Map<LibraryElement, List<Element>> _mapping =
13 <LibraryElement, List<Element>>{};
14
15 // It is very common to access the same library multiple times in a row, so
16 // we cache the last access.
17 LibraryElement _lastLibrary;
18 List<Element> _lastElements;
19
20 /// A unique name representing this fragment.
21 final String name;
22 final OutputUnit outputUnit;
23
24 Fragment.main(this.outputUnit) : name = "";
25
26 Fragment.deferred(this.outputUnit, this.name) {
27 assert(name != "");
28 }
29
30 void add(LibraryElement library, Element element) {
31 if (_lastLibrary != library) {
32 _lastLibrary = library;
33 _lastElements = _mapping.putIfAbsent(library, () => <Element>[]);
34 }
35 _lastElements.add(element);
36 }
37
38 int get length => _mapping.length;
39
40 void forEach(void f(LibraryElement library, List<Element> elements)) {
41 _mapping.forEach(f);
42 }
43 }
44
45 /// Keeps track of all elements and holders.
46 ///
47 /// This class assigns each registered element to its [Fragment] (which are in
48 /// bijection with [OutputUnit]s).
49 ///
50 /// Registered holders are assigned a name.
51 class Registry {
52 final Compiler _compiler;
53 final Map<String, Holder> _holdersMap = <String, Holder>{};
54 final Map<OutputUnit, Fragment> _deferredFragmentsMap =
55 <OutputUnit, Fragment>{};
56
57 DeferredLoadTask get _deferredLoadTask => _compiler.deferredLoadTask;
58 Iterable<Holder> get holders => _holdersMap.values;
59 Iterable<Fragment> get deferredFragments => _deferredFragmentsMap.values;
60 // Add one for the main fragment.
61 int get fragmentCount => _deferredFragmentsMap.length + 1;
62
63 Fragment mainFragment;
64
65 Registry(this._compiler);
66
67 bool get _isProgramSplit => _deferredLoadTask.isProgramSplit;
68 OutputUnit get _mainOutputUnit => _deferredLoadTask.mainOutputUnit;
69
70 Fragment _mapUnitToFragment(OutputUnit targetUnit) {
71 if (mainFragment == null) {
72 mainFragment = new Fragment.main(_deferredLoadTask.mainOutputUnit);
73 }
74 if (!_isProgramSplit) {
75 assert(targetUnit == _deferredLoadTask.mainOutputUnit);
76 return mainFragment;
77 }
78 if (targetUnit == _mainOutputUnit) return mainFragment;
79 String name = targetUnit.name;
80 return _deferredFragmentsMap.putIfAbsent(
81 targetUnit, () => new Fragment.deferred(targetUnit, name));
82 }
83
84 /// Adds all elements to their respective libraries in the correct fragment.
85 void registerElements(OutputUnit outputUnit, List<Element> elements) {
86 Fragment targetFragment = _mapUnitToFragment(outputUnit);
87 for (Element element in Elements.sortedByPosition(elements)) {
88 targetFragment.add(element.library, element);
89 }
90 }
91
92 Holder registerHolder(String name) {
93 return _holdersMap.putIfAbsent(
94 name,
95 () => new Holder(name, _holdersMap.length));
96 }
97 }
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