1 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: set ts=8 sw=4 et tw=78:
3 : *
4 : * ***** BEGIN LICENSE BLOCK *****
5 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 : *
7 : * The contents of this file are subject to the Mozilla Public License Version
8 : * 1.1 (the "License"); you may not use this file except in compliance with
9 : * the License. You may obtain a copy of the License at
10 : * http://www.mozilla.org/MPL/
11 : *
12 : * Software distributed under the License is distributed on an "AS IS" basis,
13 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 : * for the specific language governing rights and limitations under the
15 : * License.
16 : *
17 : * The Original Code is SpiderMonkey string object code.
18 : *
19 : * The Initial Developer of the Original Code is
20 : * the Mozilla Foundation.
21 : * Portions created by the Initial Developer are Copyright (C) 2011
22 : * the Initial Developer. All Rights Reserved.
23 : *
24 : * Contributor(s):
25 : * Jeff Walden <jwalden+code@mit.edu> (original author)
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either of the GNU General Public License Version 2 or later (the "GPL"),
29 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 : #ifndef StringObject_h___
42 : #define StringObject_h___
43 :
44 : #include "mozilla/Attributes.h"
45 :
46 : #include "jsobj.h"
47 : #include "jsstr.h"
48 :
49 : namespace js {
50 :
51 : class StringObject : public JSObject
52 : {
53 : static const unsigned PRIMITIVE_VALUE_SLOT = 0;
54 : static const unsigned LENGTH_SLOT = 1;
55 :
56 : public:
57 : static const unsigned RESERVED_SLOTS = 2;
58 :
59 : /*
60 : * Creates a new String object boxing the given string. The object's
61 : * [[Prototype]] is determined from context.
62 : */
63 : static inline StringObject *create(JSContext *cx, JSString *str);
64 :
65 : /*
66 : * Identical to create(), but uses |proto| as [[Prototype]]. This method
67 : * must not be used to create |String.prototype|.
68 : */
69 : static inline StringObject *createWithProto(JSContext *cx, JSString *str, JSObject &proto);
70 :
71 249270 : JSString *unbox() const {
72 249270 : return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString();
73 : }
74 :
75 : inline size_t length() const {
76 : return size_t(getFixedSlot(LENGTH_SLOT).toInt32());
77 : }
78 :
79 69 : static size_t getPrimitiveValueOffset() {
80 69 : return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT);
81 : }
82 :
83 : private:
84 : inline bool init(JSContext *cx, JSString *str);
85 :
86 5008861 : void setStringThis(JSString *str) {
87 5008861 : JS_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined());
88 5008861 : setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str));
89 5008861 : setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length())));
90 5008861 : }
91 :
92 : /* For access to init, as String.prototype is special. */
93 : friend JSObject *
94 : ::js_InitStringClass(JSContext *cx, JSObject *global);
95 :
96 : /*
97 : * Compute the initial shape to associate with fresh String objects, which
98 : * encodes the initial length property. Return the shape after changing
99 : * this String object's last property to it.
100 : */
101 : Shape *assignInitialShape(JSContext *cx);
102 :
103 : private:
104 : StringObject() MOZ_DELETE;
105 : StringObject &operator=(const StringObject &so) MOZ_DELETE;
106 : };
107 :
108 : } // namespace js
109 :
110 : #endif /* StringObject_h__ */
|