author Boris Zbarsky <>
Thu, 19 Mar 2015 10:13:33 -0400
changeset 252200 0b0c492a33b545fb9daa9b041969e17b5dcbe00e
parent 225950 d245e31f8edce3b118f5088e3e1ff08a275d7b57
child 252702 ac4464790ec4896a5188fa50cfc69ae0ffeddc08
permissions -rw-r--r--
Bug 1117172 part 3. Change the wrappercached WrapObject methods to allow passing in aGivenProto. r=peterv The only manual changes here are to BindingUtils.h, BindingUtils.cpp,, Element.cpp, IDBFileRequest.cpp, IDBObjectStore.cpp, dom/workers/Navigator.cpp, WorkerPrivate.cpp, DeviceStorageRequestChild.cpp, Notification.cpp, nsGlobalWindow.cpp, MessagePort.cpp, nsJSEnvironment.cpp, Sandbox.cpp, XPCConvert.cpp, ExportHelpers.cpp, and DataStoreService.cpp. The rest of this diff was generated by running the following commands: find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObject\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(Binding(?:_workers)?::Wrap\((?:aCx|cx|aContext|aCtx|js), [^,)]+)\)/\1, aGivenProto)/g'

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */


#include "DOMSVGLengthList.h"
#include "nsAutoPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDebug.h"
#include "nsIDOMSVGLength.h"
#include "nsTArray.h"
#include "SVGLength.h"
#include "mozilla/Attributes.h"
#include "nsWrapperCache.h"

class nsSVGElement;

// We make DOMSVGLength a pseudo-interface to allow us to QI to it in order to
// check that the objects that scripts pass to DOMSVGLengthList methods are our
// *native* length objects.
// {A8468350-7F7B-4976-9A7E-3765A1DADF9A}
  { 0xA8468350, 0x7F7B, 0x4976, { 0x9A, 0x7E, 0x37, 0x65, 0xA1, 0xDA, 0xDF, 0x9A } }

#define MOZ_SVG_LIST_INDEX_BIT_COUNT 22 // supports > 4 million list items

namespace mozilla {

class ErrorResult;

 * Class DOMSVGLength
 * This class creates the DOM objects that wrap internal SVGLength objects that
 * are in an SVGLengthList. It is also used to create the objects returned by
 * SVGSVGElement.createSVGLength().
 * For the DOM wrapper classes for non-list SVGLength, see nsSVGLength2.h.
 * See the architecture comment in DOMSVGAnimatedLengthList.h.
 * This class is strongly intertwined with DOMSVGAnimatedLengthList and
 * DOMSVGLengthList. We are a friend of DOMSVGLengthList, and are responsible
 * for nulling out our DOMSVGLengthList's pointer to us when we die, making it
 * a real weak pointer.
 * When objects of this type are in a DOMSVGLengthList they belong to an
 * attribute. While they belong to an attribute, the objects' values come from
 * their corresponding internal SVGLength objects in the internal SVGLengthList
 * objects for the attribute. Getting and setting values of a DOMSVGLength
 * requires reading and writing to its internal SVGLength. However, if the
 * DOMSVGLength is detached from its DOMSVGLengthList then it first makes a
 * copy of its internal SVGLength's value and unit so that it doesn't appear to
 * "lose" its value from script's perspective on being removed from the list.
 * This means that these DOM tearoffs have space to store these values, even
 * though they're not used in the common case.
 * Objects of this type are also used to reflect the baseVal and animVal of
 * a single, non-list SVGLength attribute. Getting and settings values of the
 * DOMSVGLength in this case requires reading and writing to the corresponding
 * nsSVGLength2 object.
 * This class also stores its current list index, attribute enum, and whether
 * it belongs to a baseVal or animVal list. This is so that objects of this
 * type can find their corresponding internal SVGLength.
 * To use these classes for <length> attributes as well as <list-of-length>
 * attributes, we would need to take a bit from mListIndex and use that to
 * indicate whether the object belongs to a list or non-list attribute, then
 * if-else as appropriate. The bug for doing that work is:
class DOMSVGLength MOZ_FINAL : public nsIDOMSVGLength,
                               public nsWrapperCache
  friend class AutoChangeLengthNotifier;

   * Ctor for creating the object returned by nsSVGLength2::ToDOMBaseVal/ToDOMAnimVal
  DOMSVGLength(nsSVGLength2* aVal, nsSVGElement* aSVGElement, bool aAnimVal);



   * Generic ctor for DOMSVGLength objects that are created for an attribute.
  DOMSVGLength(DOMSVGLengthList *aList,
               uint8_t aAttrEnum,
               uint32_t aListIndex,
               bool aIsAnimValItem);

   * Ctor for creating the objects returned by SVGSVGElement.createSVGLength(),
   * which do not initially belong to an attribute.

  static already_AddRefed<DOMSVGLength> GetTearOff(nsSVGLength2* aVal,
                                                   nsSVGElement* aSVGElement,
                                                   bool aAnimVal);

   * Create an unowned copy of a length that is owned or is reflecting a single
   * attribute. The caller is responsible for the first AddRef().
  DOMSVGLength* Copy();

  bool IsInList() const {
    return !!mList;

   * In future, if this class is used for non-list lengths, this will be
   * different to IsInList().
  bool HasOwner() const {
    return !!mList;

   * Returns whether this length object is reflecting a single SVG element
   * attribute.  This includes the baseVal or animVal of SVGRectElement.x, for
   * example, but not an item in an SVGLengthList, such as those in the
   * baseVal or animVal of SVGTextElement.x.
  bool IsReflectingAttribute() const {
    return mVal;

   * This method is called to notify this DOM object that it is being inserted
   * into a list, and give it the information it needs as a result.
   * This object MUST NOT already belong to a list when this method is called.
   * That's not to say that script can't move these DOM objects between
   * lists - it can - it's just that the logic to handle that (and send out
   * the necessary notifications) is located elsewhere (in DOMSVGLengthList).)
  void InsertingIntoList(DOMSVGLengthList *aList,
                         uint8_t aAttrEnum,
                         uint32_t aListIndex,
                         bool aIsAnimValItem);

  static uint32_t MaxListIndex() {
    return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;

  /// This method is called to notify this object that its list index changed.
  void UpdateListIndex(uint32_t aListIndex) {
    mListIndex = aListIndex;

   * This method is called to notify this DOM object that it is about to be
   * removed from its current DOM list so that it can first make a copy of its
   * internal counterpart's values. (If it didn't do this, then it would
   * "lose" its value on being removed.)
  void RemovingFromList();

  SVGLength ToSVGLength();

  // WebIDL
  uint16_t UnitType();
  float GetValue(ErrorResult& aRv);
  void SetValue(float aValue, ErrorResult& aRv);
  float ValueInSpecifiedUnits();
  void SetValueInSpecifiedUnits(float aValue, ErrorResult& aRv);
  // The XPCOM GetValueAsString is good
  void SetValueAsString(const nsAString& aValue, ErrorResult& aRv);
  void NewValueSpecifiedUnits(uint16_t aUnit, float aValue,
                              ErrorResult& aRv);
  void ConvertToSpecifiedUnits(uint16_t aUnit, ErrorResult& aRv);

  nsISupports* GetParentObject() const {
    auto svgElement = mList ? Element() : mSVGElement.get();
    return static_cast<nsIDOMSVGElement*> (svgElement);

  JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) MOZ_OVERRIDE;


  nsSVGElement* Element() const {
    return mList->Element();

  uint8_t AttrEnum() const {
    return mAttrEnum;

   * Get the axis that this length lies along. This method must only be called
   * when this object is associated with an element (HasOwner() returns true).
  uint8_t Axis() const {
    return mList->Axis();

   * Get a reference to the internal SVGLength list item that this DOM wrapper
   * object currently wraps.
   * To simplify the code we just have this one method for obtaining both
   * baseVal and animVal internal items. This means that animVal items don't
   * get const protection, but then our setter methods guard against changing
   * animVal items.
  SVGLength& InternalItem();

#ifdef DEBUG
  bool IndexIsValid();

  nsRefPtr<DOMSVGLengthList> mList;

  // Bounds for the following are checked in the ctor, so be sure to update
  // that if you change the capacity of any of the following.

  uint32_t mListIndex:MOZ_SVG_LIST_INDEX_BIT_COUNT;
  uint32_t mAttrEnum:4; // supports up to 16 attributes
  uint32_t mIsAnimValItem:1;

  // The following members are only used when we're not in a list:
  uint32_t mUnit:5; // can handle 31 units (the 10 SVG 1.1 units + rem, vw, vh, wm, calc + future additions)
  float mValue;

  // The following members are only used when we have an nsSVGLength2
  nsSVGLength2* mVal; // kept alive because it belongs to mSVGElement
  nsRefPtr<nsSVGElement> mSVGElement;


} // namespace mozilla