parser/html/nsHtml5SpeculativeLoad.h@6474c204b198 (annotated)
parser/html/nsHtml5SpeculativeLoad.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef nsHtml5SpeculativeLoad_h |
| michael@0 | 6 | #define nsHtml5SpeculativeLoad_h |
| michael@0 | 7 | |
| michael@0 | 8 | #include "nsString.h" |
| michael@0 | 9 | |
| michael@0 | 10 | class nsHtml5TreeOpExecutor; |
| michael@0 | 11 | |
| michael@0 | 12 | enum eHtml5SpeculativeLoad { |
| michael@0 | 13 | #ifdef DEBUG |
| michael@0 | 14 | eSpeculativeLoadUninitialized, |
| michael@0 | 15 | #endif |
| michael@0 | 16 | eSpeculativeLoadBase, |
| michael@0 | 17 | eSpeculativeLoadImage, |
| michael@0 | 18 | eSpeculativeLoadScript, |
| michael@0 | 19 | eSpeculativeLoadScriptFromHead, |
| michael@0 | 20 | eSpeculativeLoadStyle, |
| michael@0 | 21 | eSpeculativeLoadManifest, |
| michael@0 | 22 | eSpeculativeLoadSetDocumentCharset |
| michael@0 | 23 | }; |
| michael@0 | 24 | |
| michael@0 | 25 | class nsHtml5SpeculativeLoad { |
| michael@0 | 26 | public: |
| michael@0 | 27 | nsHtml5SpeculativeLoad(); |
| michael@0 | 28 | ~nsHtml5SpeculativeLoad(); |
| michael@0 | 29 | |
| michael@0 | 30 | inline void InitBase(const nsAString& aUrl) |
| michael@0 | 31 | { |
| michael@0 | 32 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 33 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 34 | mOpCode = eSpeculativeLoadBase; |
| michael@0 | 35 | mUrl.Assign(aUrl); |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | inline void InitImage(const nsAString& aUrl, |
| michael@0 | 39 | const nsAString& aCrossOrigin) |
| michael@0 | 40 | { |
| michael@0 | 41 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 42 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 43 | mOpCode = eSpeculativeLoadImage; |
| michael@0 | 44 | mUrl.Assign(aUrl); |
| michael@0 | 45 | mCrossOrigin.Assign(aCrossOrigin); |
| michael@0 | 46 | } |
| michael@0 | 47 | |
| michael@0 | 48 | inline void InitScript(const nsAString& aUrl, |
| michael@0 | 49 | const nsAString& aCharset, |
| michael@0 | 50 | const nsAString& aType, |
| michael@0 | 51 | const nsAString& aCrossOrigin, |
| michael@0 | 52 | bool aParserInHead) |
| michael@0 | 53 | { |
| michael@0 | 54 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 55 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 56 | mOpCode = aParserInHead ? |
| michael@0 | 57 | eSpeculativeLoadScriptFromHead : eSpeculativeLoadScript; |
| michael@0 | 58 | mUrl.Assign(aUrl); |
| michael@0 | 59 | mCharset.Assign(aCharset); |
| michael@0 | 60 | mTypeOrCharsetSource.Assign(aType); |
| michael@0 | 61 | mCrossOrigin.Assign(aCrossOrigin); |
| michael@0 | 62 | } |
| michael@0 | 63 | |
| michael@0 | 64 | inline void InitStyle(const nsAString& aUrl, const nsAString& aCharset, |
| michael@0 | 65 | const nsAString& aCrossOrigin) |
| michael@0 | 66 | { |
| michael@0 | 67 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 68 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 69 | mOpCode = eSpeculativeLoadStyle; |
| michael@0 | 70 | mUrl.Assign(aUrl); |
| michael@0 | 71 | mCharset.Assign(aCharset); |
| michael@0 | 72 | mCrossOrigin.Assign(aCrossOrigin); |
| michael@0 | 73 | } |
| michael@0 | 74 | |
| michael@0 | 75 | /** |
| michael@0 | 76 | * "Speculative" manifest loads aren't truly speculative--if a manifest |
| michael@0 | 77 | * gets loaded, we are committed to it. There can never be a <script> |
| michael@0 | 78 | * before the manifest, so the situation of having to undo a manifest due |
| michael@0 | 79 | * to document.write() never arises. The reason why a parser |
| michael@0 | 80 | * thread-discovered manifest gets loaded via the speculative load queue |
| michael@0 | 81 | * as opposed to tree operation queue is that the manifest must get |
| michael@0 | 82 | * processed before any actual speculative loads such as scripts. Thus, |
| michael@0 | 83 | * manifests seen by the parser thread have to maintain the queue order |
| michael@0 | 84 | * relative to true speculative loads. See bug 541079. |
| michael@0 | 85 | */ |
| michael@0 | 86 | inline void InitManifest(const nsAString& aUrl) |
| michael@0 | 87 | { |
| michael@0 | 88 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 89 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 90 | mOpCode = eSpeculativeLoadManifest; |
| michael@0 | 91 | mUrl.Assign(aUrl); |
| michael@0 | 92 | } |
| michael@0 | 93 | |
| michael@0 | 94 | /** |
| michael@0 | 95 | * "Speculative" charset setting isn't truly speculative. If the charset |
| michael@0 | 96 | * is set via this operation, we are committed to it unless chardet or |
| michael@0 | 97 | * a late meta cause a reload. The reason why a parser |
| michael@0 | 98 | * thread-discovered charset gets communicated via the speculative load |
| michael@0 | 99 | * queue as opposed to tree operation queue is that the charset change |
| michael@0 | 100 | * must get processed before any actual speculative loads such as style |
| michael@0 | 101 | * sheets. Thus, encoding decisions by the parser thread have to maintain |
| michael@0 | 102 | * the queue order relative to true speculative loads. See bug 675499. |
| michael@0 | 103 | */ |
| michael@0 | 104 | inline void InitSetDocumentCharset(nsACString& aCharset, |
| michael@0 | 105 | int32_t aCharsetSource) |
| michael@0 | 106 | { |
| michael@0 | 107 | NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized, |
| michael@0 | 108 | "Trying to reinitialize a speculative load!"); |
| michael@0 | 109 | mOpCode = eSpeculativeLoadSetDocumentCharset; |
| michael@0 | 110 | CopyUTF8toUTF16(aCharset, mCharset); |
| michael@0 | 111 | mTypeOrCharsetSource.Assign((char16_t)aCharsetSource); |
| michael@0 | 112 | } |
| michael@0 | 113 | |
| michael@0 | 114 | void Perform(nsHtml5TreeOpExecutor* aExecutor); |
| michael@0 | 115 | |
| michael@0 | 116 | private: |
| michael@0 | 117 | eHtml5SpeculativeLoad mOpCode; |
| michael@0 | 118 | nsString mUrl; |
| michael@0 | 119 | /** |
| michael@0 | 120 | * If mOpCode is eSpeculativeLoadStyle or eSpeculativeLoadScript[FromHead] |
| michael@0 | 121 | * then this is the value of the "charset" attribute. For |
| michael@0 | 122 | * eSpeculativeLoadSetDocumentCharset it is the charset that the |
| michael@0 | 123 | * document's charset is being set to. Otherwise it's empty. |
| michael@0 | 124 | */ |
| michael@0 | 125 | nsString mCharset; |
| michael@0 | 126 | /** |
| michael@0 | 127 | * If mOpCode is eSpeculativeLoadSetDocumentCharset, this is a |
| michael@0 | 128 | * one-character string whose single character's code point is to be |
| michael@0 | 129 | * interpreted as a charset source integer. Otherwise, it is empty or |
| michael@0 | 130 | * the value of the type attribute. |
| michael@0 | 131 | */ |
| michael@0 | 132 | nsString mTypeOrCharsetSource; |
| michael@0 | 133 | /** |
| michael@0 | 134 | * If mOpCode is eSpeculativeLoadImage or eSpeculativeLoadScript[FromHead], |
| michael@0 | 135 | * this is the value of the "crossorigin" attribute. If the |
| michael@0 | 136 | * attribute is not set, this will be a void string. |
| michael@0 | 137 | */ |
| michael@0 | 138 | nsString mCrossOrigin; |
| michael@0 | 139 | }; |
| michael@0 | 140 | |
| michael@0 | 141 | #endif // nsHtml5SpeculativeLoad_h |
