DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "nsArray.h"
#include "nsArrayEnumerator.h"
#include "nsIWeakReference.h"
#include "nsIWeakReferenceUtils.h"
#include "nsThreadUtils.h"

// used by IndexOf()
struct MOZ_STACK_CLASS findIndexOfClosure
{
  // This is only used for pointer comparison, so we can just use a void*.
  void* targetElement;
  uint32_t startIndex;
  uint32_t resultIndex;
};

static bool FindElementCallback(void* aElement, void* aClosure);

NS_INTERFACE_MAP_BEGIN(nsArray)
  NS_INTERFACE_MAP_ENTRY(nsIArray)
  NS_INTERFACE_MAP_ENTRY(nsIArrayExtensions)
  NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsArrayCC)
  NS_INTERFACE_MAP_ENTRY(nsIArray)
  NS_INTERFACE_MAP_ENTRY(nsIArrayExtensions)
  NS_INTERFACE_MAP_ENTRY(nsIMutableArray)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutableArray)
NS_INTERFACE_MAP_END

nsArrayBase::~nsArrayBase()
{
  Clear();
}


NS_IMPL_ADDREF(nsArray)
NS_IMPL_RELEASE(nsArray)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsArrayCC)

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsArrayCC)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsArrayCC)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsArrayCC)
  tmp->Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsArrayCC)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mArray)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMETHODIMP
nsArrayBase::GetLength(uint32_t* aLength)
{
  *aLength = mArray.Count();
  return NS_OK;
}

NS_IMETHODIMP
nsArrayBase::QueryElementAt(uint32_t aIndex,
                            const nsIID& aIID,
                            void** aResult)
{
  nsISupports* obj = mArray.SafeObjectAt(aIndex);
  if (!obj) {
    return NS_ERROR_ILLEGAL_VALUE;
  }

  // no need to worry about a leak here, because SafeObjectAt()
  // doesn't addref its result
  return obj->QueryInterface(aIID, aResult);
}

NS_IMETHODIMP
nsArrayBase::IndexOf(uint32_t aStartIndex, nsISupports* aElement,
                     uint32_t* aResult)
{
  // optimize for the common case by forwarding to mArray
  if (aStartIndex == 0) {
    uint32_t idx = mArray.IndexOf(aElement);
    if (idx == UINT32_MAX) {
      return NS_ERROR_FAILURE;
    }

    *aResult = idx;
    return NS_OK;
  }

  findIndexOfClosure closure = { aElement, aStartIndex, 0 };
  bool notFound = mArray.EnumerateForwards(FindElementCallback, &closure);
  if (notFound) {
    return NS_ERROR_FAILURE;
  }

  *aResult = closure.resultIndex;
  return NS_OK;
}

NS_IMETHODIMP
nsArrayBase::Enumerate(nsISimpleEnumerator** aResult)
{
  return NS_NewArrayEnumerator(aResult, static_cast<nsIArray*>(this));
}

// nsIMutableArray implementation

NS_IMETHODIMP
nsArrayBase::AppendElement(nsISupports* aElement, bool aWeak)
{
  bool result;
  if (aWeak) {
    nsCOMPtr<nsIWeakReference> elementRef = do_GetWeakReference(aElement);
    NS_ASSERTION(elementRef,
                 "AppendElement: Trying to use weak references on an object that doesn't support it");
    if (!elementRef) {
      return NS_ERROR_FAILURE;
    }
    result = mArray.AppendObject(elementRef);
  }

  else {
    // add the object directly
    result = mArray.AppendObject(aElement);
  }
  return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArrayBase::RemoveElementAt(uint32_t aIndex)
{
  bool result = mArray.RemoveObjectAt(aIndex);
  return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArrayBase::InsertElementAt(nsISupports* aElement, uint32_t aIndex, bool aWeak)
{
  nsCOMPtr<nsISupports> elementRef;
  if (aWeak) {
    elementRef = do_GetWeakReference(aElement);
    NS_ASSERTION(elementRef,
                 "InsertElementAt: Trying to use weak references on an object that doesn't support it");
    if (!elementRef) {
      return NS_ERROR_FAILURE;
    }
  } else {
    elementRef = aElement;
  }
  bool result = mArray.InsertObjectAt(elementRef, aIndex);
  return result ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsArrayBase::ReplaceElementAt(nsISupports* aElement, uint32_t aIndex, bool aWeak)
{
  nsCOMPtr<nsISupports> elementRef;
  if (aWeak) {
    elementRef = do_GetWeakReference(aElement);
    NS_ASSERTION(elementRef,
                 "ReplaceElementAt: Trying to use weak references on an object that doesn't support it");
    if (!elementRef) {
      return NS_ERROR_FAILURE;
    }
  } else {
    elementRef = aElement;
  }
  mArray.ReplaceObjectAt(elementRef, aIndex);
  return NS_OK;
}

NS_IMETHODIMP
nsArrayBase::Clear()
{
  mArray.Clear();
  return NS_OK;
}

// nsIArrayExtensions implementation.

NS_IMETHODIMP
nsArrayBase::Count(uint32_t* aResult)
{
  return GetLength(aResult);
}

NS_IMETHODIMP
nsArrayBase::GetElementAt(uint32_t aIndex, nsISupports** aResult)
{
  nsCOMPtr<nsISupports> obj = mArray.SafeObjectAt(aIndex);
  obj.forget(aResult);
  return NS_OK;
}

//
// static helper routines
//
bool
FindElementCallback(void* aElement, void* aClosure)
{
  findIndexOfClosure* closure = static_cast<findIndexOfClosure*>(aClosure);
  nsISupports* element = static_cast<nsISupports*>(aElement);

  // don't start searching until we're past the startIndex
  if (closure->resultIndex >= closure->startIndex &&
      element == closure->targetElement) {
    return false;    // stop! We found it
  }
  closure->resultIndex++;

  return true;
}

nsresult
nsArrayBase::XPCOMConstructor(nsISupports* aOuter, const nsIID& aIID,
                              void** aResult)
{
  if (aOuter) {
    return NS_ERROR_NO_AGGREGATION;
  }

  nsCOMPtr<nsIMutableArray> inst = Create();
  return inst->QueryInterface(aIID, aResult);
}

already_AddRefed<nsIMutableArray>
nsArrayBase::Create()
{
  nsCOMPtr<nsIMutableArray> inst;
  if (NS_IsMainThread()) {
    inst = new nsArrayCC;
  } else {
    inst = new nsArray;
  }
  return inst.forget();
}