/work/obj-fuzz/dist/include/mozilla/PostTraversalTask.h
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | #ifndef mozilla_PostTraversalTask_h |
8 | | #define mozilla_PostTraversalTask_h |
9 | | |
10 | | #include "nscore.h" |
11 | | |
12 | | /* a task to be performed immediately after a Servo traversal */ |
13 | | |
14 | | namespace mozilla { |
15 | | namespace dom { |
16 | | class FontFace; |
17 | | class FontFaceSet; |
18 | | } // namespace dom |
19 | | } // namespace mozilla |
20 | | class gfxUserFontEntry; |
21 | | |
22 | | namespace mozilla { |
23 | | |
24 | | /** |
25 | | * A PostTraversalTask is a task to be performed immediately after a Servo |
26 | | * traversal. There are just a few tasks we need to perform, so we use this |
27 | | * class rather than Runnables, to avoid virtual calls and some allocations. |
28 | | * |
29 | | * A PostTraversalTask is only safe to run immediately after the Servo |
30 | | * traversal, since it can hold raw pointers to DOM objects. |
31 | | */ |
32 | | class PostTraversalTask |
33 | | { |
34 | | public: |
35 | | static PostTraversalTask ResolveFontFaceLoadedPromise(dom::FontFace* aFontFace) |
36 | 0 | { |
37 | 0 | auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise); |
38 | 0 | task.mTarget = aFontFace; |
39 | 0 | return task; |
40 | 0 | } |
41 | | |
42 | | static PostTraversalTask RejectFontFaceLoadedPromise(dom::FontFace* aFontFace, |
43 | | nsresult aResult) |
44 | 0 | { |
45 | 0 | auto task = PostTraversalTask(Type::ResolveFontFaceLoadedPromise); |
46 | 0 | task.mTarget = aFontFace; |
47 | 0 | task.mResult = aResult; |
48 | 0 | return task; |
49 | 0 | } |
50 | | |
51 | | static PostTraversalTask DispatchLoadingEventAndReplaceReadyPromise( |
52 | | dom::FontFaceSet* aFontFaceSet) |
53 | 0 | { |
54 | 0 | auto task = |
55 | 0 | PostTraversalTask(Type::DispatchLoadingEventAndReplaceReadyPromise); |
56 | 0 | task.mTarget = aFontFaceSet; |
57 | 0 | return task; |
58 | 0 | } |
59 | | |
60 | | static PostTraversalTask DispatchFontFaceSetCheckLoadingFinishedAfterDelay( |
61 | | dom::FontFaceSet* aFontFaceSet) |
62 | 0 | { |
63 | 0 | auto task = |
64 | 0 | PostTraversalTask(Type::DispatchFontFaceSetCheckLoadingFinishedAfterDelay); |
65 | 0 | task.mTarget = aFontFaceSet; |
66 | 0 | return task; |
67 | 0 | } |
68 | | |
69 | | static PostTraversalTask LoadFontEntry(gfxUserFontEntry* aFontEntry) |
70 | 0 | { |
71 | 0 | auto task = PostTraversalTask(Type::LoadFontEntry); |
72 | 0 | task.mTarget = aFontEntry; |
73 | 0 | return task; |
74 | 0 | } |
75 | | |
76 | | void Run(); |
77 | | |
78 | | private: |
79 | | // For any new raw pointer type that we need to store in a PostTraversalTask, |
80 | | // please add an assertion that class' destructor that we are not in a Servo |
81 | | // traversal, to protect against the possibility of having dangling pointers. |
82 | | enum class Type |
83 | | { |
84 | | // mTarget (FontFace*) |
85 | | ResolveFontFaceLoadedPromise, |
86 | | |
87 | | // mTarget (FontFace*) |
88 | | // mResult |
89 | | RejectFontFaceLoadedPromise, |
90 | | |
91 | | // mTarget (FontFaceSet*) |
92 | | DispatchLoadingEventAndReplaceReadyPromise, |
93 | | |
94 | | // mTarget (FontFaceSet*) |
95 | | DispatchFontFaceSetCheckLoadingFinishedAfterDelay, |
96 | | |
97 | | // mTarget (gfxUserFontEntry*) |
98 | | LoadFontEntry, |
99 | | }; |
100 | | |
101 | | explicit PostTraversalTask(Type aType) |
102 | | : mType(aType) |
103 | | , mTarget(nullptr) |
104 | | , mResult(NS_OK) |
105 | 0 | { |
106 | 0 | } |
107 | | |
108 | | Type mType; |
109 | | void* mTarget; |
110 | | nsresult mResult; |
111 | | }; |
112 | | |
113 | | } // namespace mozilla |
114 | | |
115 | | #endif // mozilla_PostTraversalTask_h |