| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * 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 vm_StringObject_h |
| #define vm_StringObject_h |
| |
| #include "jsobj.h" |
| #include "jsstr.h" |
| |
| #include "vm/Shape.h" |
| |
| namespace js { |
| |
| class StringObject : public NativeObject |
| { |
| static const unsigned PRIMITIVE_VALUE_SLOT = 0; |
| static const unsigned LENGTH_SLOT = 1; |
| |
| public: |
| static const unsigned RESERVED_SLOTS = 2; |
| |
| static const Class class_; |
| |
| /* |
| * Creates a new String object boxing the given string. The object's |
| * [[Prototype]] is determined from context. |
| */ |
| static inline StringObject* create(JSContext* cx, HandleString str, |
| HandleObject proto = nullptr, |
| NewObjectKind newKind = GenericObject); |
| |
| /* |
| * Compute the initial shape to associate with fresh String objects, which |
| * encodes the initial length property. Return the shape after changing |
| * |obj|'s last property to it. |
| */ |
| static Shape* |
| assignInitialShape(ExclusiveContext* cx, Handle<StringObject*> obj); |
| |
| JSString* unbox() const { |
| return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString(); |
| } |
| |
| inline size_t length() const { |
| return size_t(getFixedSlot(LENGTH_SLOT).toInt32()); |
| } |
| |
| static size_t offsetOfPrimitiveValue() { |
| return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT); |
| } |
| static size_t offsetOfLength() { |
| return getFixedSlotOffset(LENGTH_SLOT); |
| } |
| |
| private: |
| inline bool init(JSContext* cx, HandleString str); |
| |
| void setStringThis(JSString* str) { |
| MOZ_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined()); |
| setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str)); |
| setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length()))); |
| } |
| |
| /* For access to init, as String.prototype is special. */ |
| friend JSObject* |
| js::InitStringClass(JSContext* cx, HandleObject global); |
| }; |
| |
| } // namespace js |
| |
| #endif /* vm_StringObject_h */ |