/* -*- 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 */