tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

StringObject.h (2231B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
      2 * vim: set ts=8 sts=2 et sw=2 tw=80:
      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/. */
      6 
      7 #ifndef vm_StringObject_h
      8 #define vm_StringObject_h
      9 
     10 #include "vm/JSObject.h"
     11 #include "vm/NativeObject.h"
     12 
     13 namespace js {
     14 
     15 class Shape;
     16 
     17 class StringObject : public NativeObject {
     18  static const unsigned PRIMITIVE_VALUE_SLOT = 0;
     19  static const unsigned LENGTH_SLOT = 1;
     20 
     21  static const ClassSpec classSpec_;
     22 
     23 public:
     24  static const unsigned RESERVED_SLOTS = 2;
     25 
     26  static const JSClass class_;
     27 
     28  /*
     29   * Creates a new String object boxing the given string.  The object's
     30   * [[Prototype]] is determined from context.
     31   */
     32  static inline StringObject* create(JSContext* cx, HandleString str,
     33                                     HandleObject proto = nullptr,
     34                                     NewObjectKind newKind = GenericObject);
     35 
     36  /*
     37   * Compute the initial shape to associate with fresh String objects, which
     38   * encodes the initial length property. Return the shape after changing
     39   * |obj|'s last property to it.
     40   */
     41  static SharedShape* assignInitialShape(JSContext* cx,
     42                                         Handle<StringObject*> obj);
     43 
     44  JSString* unbox() const {
     45    return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString();
     46  }
     47 
     48  inline size_t length() const {
     49    return size_t(getFixedSlot(LENGTH_SLOT).toInt32());
     50  }
     51 
     52  static size_t offsetOfPrimitiveValue() {
     53    return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT);
     54  }
     55  static size_t offsetOfLength() { return getFixedSlotOffset(LENGTH_SLOT); }
     56 
     57 private:
     58  static inline bool init(JSContext* cx, Handle<StringObject*> obj,
     59                          HandleString str);
     60 
     61  static JSObject* createPrototype(JSContext* cx, JSProtoKey key);
     62 
     63  void setStringThis(JSString* str) {
     64    MOZ_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined());
     65    setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str));
     66    setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length())));
     67  }
     68 };
     69 
     70 }  // namespace js
     71 
     72 #endif /* vm_StringObject_h */