blob: 43f9b5f2f2d476b8340c79cb9646dd32318541a7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsHtml5AtomTable_h
#define nsHtml5AtomTable_h
#include "nsHashKeys.h"
#include "nsTHashtable.h"
#include "nsAutoPtr.h"
#include "nsIAtom.h"
#include "nsIThread.h"
class nsHtml5Atom;
class nsHtml5AtomEntry : public nsStringHashKey
{
public:
explicit nsHtml5AtomEntry(KeyTypePointer aStr);
nsHtml5AtomEntry(const nsHtml5AtomEntry& aOther);
~nsHtml5AtomEntry();
inline nsHtml5Atom* GetAtom()
{
return mAtom;
}
private:
nsAutoPtr<nsHtml5Atom> mAtom;
};
/**
* nsHtml5AtomTable provides non-locking lookup and creation of atoms for
* nsHtml5Parser or nsHtml5StreamParser.
*
* The hashtable holds dynamically allocated atoms that are private to an
* instance of nsHtml5Parser or nsHtml5StreamParser. (Static atoms are used on
* interned nsHtml5ElementNames and interned nsHtml5AttributeNames. Also, when
* the doctype name is 'html', that identifier needs to be represented as a
* static atom.)
*
* Each instance of nsHtml5Parser has a single instance of nsHtml5AtomTable,
* and each instance of nsHtml5StreamParser has a single instance of
* nsHtml5AtomTable. Dynamic atoms obtained from an nsHtml5AtomTable are valid
* for == comparison with each other or with atoms declared in nsHtml5Atoms
* within the nsHtml5Tokenizer and the nsHtml5TreeBuilder instances owned by
* the same nsHtml5Parser/nsHtml5StreamParser instance that owns the
* nsHtml5AtomTable instance.
*
* Dynamic atoms (atoms whose IsStaticAtom() returns false) obtained from
* nsHtml5AtomTable must be re-obtained from another atom table when there's a
* need to migrate atoms from an nsHtml5Parser to its nsHtml5StreamParser
* (re-obtain from the other nsHtml5AtomTable), from an nsHtml5Parser to its
* owner nsHtml5Parser (re-obtain from the other nsHtml5AtomTable) or from the
* parser to the DOM (re-obtain from the application-wide atom table). To
* re-obtain an atom from another atom table, obtain a string from the atom
* using ToString(nsAString&) and look up an atom in the other table using that
* string.
*
* An instance of nsHtml5AtomTable that belongs to an nsHtml5Parser is only
* accessed from the main thread. An instance of nsHtml5AtomTable that belongs
* to an nsHtml5StreamParser is accessed both from the main thread and from the
* thread that executes the runnables of the nsHtml5StreamParser instance.
* However, the threads never access the nsHtml5AtomTable instance concurrently
* in the nsHtml5StreamParser case.
*
* Methods on the atoms obtained from nsHtml5AtomTable may be called on any
* thread, although they only need to be called on the main thread or on the
* thread working for the nsHtml5StreamParser when nsHtml5AtomTable belongs to
* an nsHtml5StreamParser.
*
* Dynamic atoms obtained from nsHtml5AtomTable are deleted when the
* nsHtml5AtomTable itself is destructed, which happens when the owner
* nsHtml5Parser or nsHtml5StreamParser is destructed.
*/
class nsHtml5AtomTable
{
public:
nsHtml5AtomTable();
~nsHtml5AtomTable();
/**
* Obtains the atom for the given string in the scope of this atom table.
*/
nsIAtom* GetAtom(const nsAString& aKey);
/**
* Empties the table.
*/
void Clear()
{
mTable.Clear();
}
#ifdef DEBUG
void SetPermittedLookupThread(nsIThread* aThread)
{
mPermittedLookupThread = aThread;
}
#endif
private:
nsTHashtable<nsHtml5AtomEntry> mTable;
#ifdef DEBUG
nsCOMPtr<nsIThread> mPermittedLookupThread;
#endif
};
#endif // nsHtml5AtomTable_h
|
