1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/StringObject.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,78 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef vm_StringObject_h
1.11 +#define vm_StringObject_h
1.12 +
1.13 +#include "jsobj.h"
1.14 +#include "jsstr.h"
1.15 +
1.16 +#include "vm/Shape.h"
1.17 +
1.18 +namespace js {
1.19 +
1.20 +class StringObject : public JSObject
1.21 +{
1.22 + static const unsigned PRIMITIVE_VALUE_SLOT = 0;
1.23 + static const unsigned LENGTH_SLOT = 1;
1.24 +
1.25 + public:
1.26 + static const unsigned RESERVED_SLOTS = 2;
1.27 +
1.28 + static const Class class_;
1.29 +
1.30 + /*
1.31 + * Creates a new String object boxing the given string. The object's
1.32 + * [[Prototype]] is determined from context.
1.33 + */
1.34 + static inline StringObject *create(JSContext *cx, HandleString str,
1.35 + NewObjectKind newKind = GenericObject);
1.36 +
1.37 + JSString *unbox() const {
1.38 + return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString();
1.39 + }
1.40 +
1.41 + inline size_t length() const {
1.42 + return size_t(getFixedSlot(LENGTH_SLOT).toInt32());
1.43 + }
1.44 +
1.45 + static size_t offsetOfPrimitiveValue() {
1.46 + return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT);
1.47 + }
1.48 + static size_t offsetOfLength() {
1.49 + return getFixedSlotOffset(LENGTH_SLOT);
1.50 + }
1.51 +
1.52 + private:
1.53 + inline bool init(JSContext *cx, HandleString str);
1.54 +
1.55 + void setStringThis(JSString *str) {
1.56 + JS_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined());
1.57 + setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str));
1.58 + setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length())));
1.59 + }
1.60 +
1.61 + /* For access to init, as String.prototype is special. */
1.62 + friend JSObject *
1.63 + ::js_InitStringClass(JSContext *cx, js::HandleObject global);
1.64 +
1.65 + /* For access to assignInitialShape. */
1.66 + friend bool
1.67 + EmptyShape::ensureInitialCustomShape<StringObject>(ExclusiveContext *cx,
1.68 + Handle<StringObject*> obj);
1.69 +
1.70 + /*
1.71 + * Compute the initial shape to associate with fresh String objects, which
1.72 + * encodes the initial length property. Return the shape after changing
1.73 + * |obj|'s last property to it.
1.74 + */
1.75 + static Shape *
1.76 + assignInitialShape(ExclusiveContext *cx, Handle<StringObject*> obj);
1.77 +};
1.78 +
1.79 +} // namespace js
1.80 +
1.81 +#endif /* vm_StringObject_h */
