The Tor Browser: js/src/vm/StringObject.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef vm_StringObject_h

     8 #define vm_StringObject_h

    10 #include "jsobj.h"

    11 #include "jsstr.h"

    13 #include "vm/Shape.h"

    15 namespace js {

    17 class StringObject : public JSObject

    18 {

    19     static const unsigned PRIMITIVE_VALUE_SLOT = 0;

    20     static const unsigned LENGTH_SLOT = 1;

    22   public:

    23     static const unsigned RESERVED_SLOTS = 2;

    25     static const Class class_;

    27     /*

    28      * Creates a new String object boxing the given string.  The object's

    29      * [[Prototype]] is determined from context.

    30      */

    31     static inline StringObject *create(JSContext *cx, HandleString str,

    32                                        NewObjectKind newKind = GenericObject);

    34     JSString *unbox() const {

    35         return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString();

    36     }

    38     inline size_t length() const {

    39         return size_t(getFixedSlot(LENGTH_SLOT).toInt32());

    40     }

    42     static size_t offsetOfPrimitiveValue() {

    43         return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT);

    44     }

    45     static size_t offsetOfLength() {

    46         return getFixedSlotOffset(LENGTH_SLOT);

    47     }

    49   private:

    50     inline bool init(JSContext *cx, HandleString str);

    52     void setStringThis(JSString *str) {

    53         JS_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined());

    54         setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str));

    55         setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length())));

    56     }

    58     /* For access to init, as String.prototype is special. */

    59     friend JSObject *

    60     ::js_InitStringClass(JSContext *cx, js::HandleObject global);

    62     /* For access to assignInitialShape. */

    63     friend bool

    64     EmptyShape::ensureInitialCustomShape<StringObject>(ExclusiveContext *cx,

    65                                                        Handle<StringObject*> obj);

    67     /*

    68      * Compute the initial shape to associate with fresh String objects, which

    69      * encodes the initial length property. Return the shape after changing

    70      * |obj|'s last property to it.

    71      */

    72     static Shape *

    73     assignInitialShape(ExclusiveContext *cx, Handle<StringObject*> obj);

    74 };

    76 } // namespace js

    78 #endif /* vm_StringObject_h */

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