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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef WTF_AtomicStringTable_h | 5 #include "platform/wtf/text/AtomicStringTable.h" |
6 #define WTF_AtomicStringTable_h | |
7 | 6 |
8 #include "wtf/Allocator.h" | 7 // The contents of this header was moved to platform/wtf as part of |
9 #include "wtf/HashSet.h" | 8 // WTF migration project. See the following post for details: |
10 #include "wtf/WTFExport.h" | 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY
CAAJ |
11 #include "wtf/WTFThreadData.h" | |
12 #include "wtf/text/StringHash.h" | |
13 #include "wtf/text/StringImpl.h" | |
14 | |
15 namespace WTF { | |
16 | |
17 // The underlying storage that keeps the map of unique AtomicStrings. This is | |
18 // not thread safe and each WTFThreadData has one. | |
19 class WTF_EXPORT AtomicStringTable final { | |
20 USING_FAST_MALLOC(AtomicStringTable); | |
21 WTF_MAKE_NONCOPYABLE(AtomicStringTable); | |
22 | |
23 public: | |
24 AtomicStringTable(); | |
25 ~AtomicStringTable(); | |
26 | |
27 // Gets the shared table for the current thread. | |
28 static AtomicStringTable& instance() { | |
29 return wtfThreadData().getAtomicStringTable(); | |
30 } | |
31 | |
32 // Used by system initialization to preallocate enough storage for all of | |
33 // the static strings. | |
34 void reserveCapacity(unsigned size); | |
35 | |
36 // Inserting strings into the table. Note that the return value from adding | |
37 // a UChar string may be an LChar string as the table will attempt to | |
38 // convert the string to save memory if possible. | |
39 StringImpl* add(StringImpl*); | |
40 PassRefPtr<StringImpl> add(const LChar* chars, unsigned length); | |
41 PassRefPtr<StringImpl> add(const UChar* chars, unsigned length); | |
42 | |
43 // Adding UTF8. | |
44 // Returns null if the characters contain invalid utf8 sequences. | |
45 // Pass null for the charactersEnd to automatically detect the length. | |
46 PassRefPtr<StringImpl> addUTF8(const char* charactersStart, | |
47 const char* charactersEnd); | |
48 | |
49 // This is for ~StringImpl to unregister a string before destruction since | |
50 // the table is holding weak pointers. It should not be used directly. | |
51 void remove(StringImpl*); | |
52 | |
53 private: | |
54 template <typename T, typename HashTranslator> | |
55 inline PassRefPtr<StringImpl> addToStringTable(const T& value); | |
56 | |
57 HashSet<StringImpl*> m_table; | |
58 }; | |
59 | |
60 } // namespace WTF | |
61 | |
62 using WTF::AtomicStringTable; | |
63 | |
64 #endif | |
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