1 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : *
3 : * ***** BEGIN LICENSE BLOCK *****
4 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 : *
6 : * The contents of this file are subject to the Mozilla Public License Version
7 : * 1.1 (the "License"); you may not use this file except in compliance with
8 : * the License. You may obtain a copy of the License at
9 : * http://www.mozilla.org/MPL/
10 : *
11 : * Software distributed under the License is distributed on an "AS IS" basis,
12 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 : * for the specific language governing rights and limitations under the
14 : * License.
15 : *
16 : * The Original Code is SpiderMonkey code.
17 : *
18 : * The Initial Developer of the Original Code is
19 : * Mozilla Corporation.
20 : * Portions created by the Initial Developer are Copyright (C) 2010
21 : * the Initial Developer. All Rights Reserved.
22 : *
23 : * Contributor(s):
24 : * Gregor Wagner <anygregor@gmail.com>
25 : *
26 : * Alternatively, the contents of this file may be used under the terms of
27 : * either of the GNU General Public License Version 2 or later (the "GPL"),
28 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 : * in which case the provisions of the GPL or the LGPL are applicable instead
30 : * of those above. If you wish to allow use of your version of this file only
31 : * under the terms of either the GPL or the LGPL, and not to allow others to
32 : * use your version of this file under the terms of the MPL, indicate your
33 : * decision by deleting the provisions above and replace them with the notice
34 : * and other provisions required by the GPL or the LGPL. If you do not delete
35 : * the provisions above, a recipient may use your version of this file under
36 : * the terms of any one of the MPL, the GPL or the LGPL.
37 : *
38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : #ifndef jscell_h___
41 : #define jscell_h___
42 :
43 : #include "jspubtd.h"
44 :
45 : struct JSCompartment;
46 :
47 : namespace js {
48 : namespace gc {
49 :
50 : struct ArenaHeader;
51 : struct Chunk;
52 :
53 : /* The GC allocation kinds. */
54 : enum AllocKind {
55 : FINALIZE_OBJECT0,
56 : FINALIZE_OBJECT0_BACKGROUND,
57 : FINALIZE_OBJECT2,
58 : FINALIZE_OBJECT2_BACKGROUND,
59 : FINALIZE_OBJECT4,
60 : FINALIZE_OBJECT4_BACKGROUND,
61 : FINALIZE_OBJECT8,
62 : FINALIZE_OBJECT8_BACKGROUND,
63 : FINALIZE_OBJECT12,
64 : FINALIZE_OBJECT12_BACKGROUND,
65 : FINALIZE_OBJECT16,
66 : FINALIZE_OBJECT16_BACKGROUND,
67 : FINALIZE_OBJECT_LAST = FINALIZE_OBJECT16_BACKGROUND,
68 : FINALIZE_SCRIPT,
69 : FINALIZE_SHAPE,
70 : FINALIZE_BASE_SHAPE,
71 : FINALIZE_TYPE_OBJECT,
72 : #if JS_HAS_XML_SUPPORT
73 : FINALIZE_XML,
74 : #endif
75 : FINALIZE_SHORT_STRING,
76 : FINALIZE_STRING,
77 : FINALIZE_EXTERNAL_STRING,
78 : FINALIZE_LAST = FINALIZE_EXTERNAL_STRING
79 : };
80 :
81 : static const unsigned FINALIZE_LIMIT = FINALIZE_LAST + 1;
82 : static const unsigned FINALIZE_OBJECT_LIMIT = FINALIZE_OBJECT_LAST + 1;
83 :
84 : /*
85 : * Live objects are marked black. How many other additional colors are available
86 : * depends on the size of the GCThing. Objects marked gray are eligible for
87 : * cycle collection.
88 : */
89 : static const uint32_t BLACK = 0;
90 : static const uint32_t GRAY = 1;
91 :
92 : /*
93 : * A GC cell is the base class for all GC things.
94 : */
95 43494950 : struct Cell {
96 : static const size_t CellShift = 3;
97 : static const size_t CellSize = size_t(1) << CellShift;
98 : static const size_t CellMask = CellSize - 1;
99 :
100 : inline uintptr_t address() const;
101 : inline ArenaHeader *arenaHeader() const;
102 : inline Chunk *chunk() const;
103 : inline AllocKind getAllocKind() const;
104 :
105 : JS_ALWAYS_INLINE bool isMarked(uint32_t color = BLACK) const;
106 : JS_ALWAYS_INLINE bool markIfUnmarked(uint32_t color = BLACK) const;
107 : JS_ALWAYS_INLINE void unmark(uint32_t color) const;
108 :
109 : inline JSCompartment *compartment() const;
110 :
111 : #ifdef DEBUG
112 : inline bool isAligned() const;
113 : #endif
114 : };
115 :
116 : } /* namespace gc */
117 : } /* namespace js */
118 :
119 : #endif /* jscell_h___ */
|