1 files changed, 323 insertions, 0 deletions
diff --git a/xpcom/glue/nsCOMArray.cpp b/xpcom/glue/nsCOMArray.cpp
new file mode 100644
index 000000000..3522f7b0d
--- /dev/null
+++ b/xpcom/glue/nsCOMArray.cpp
@@ -0,0 +1,323 @@
+/* -*- 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 "nsCOMArray.h"
+
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/OperatorNewExtensions.h"
+
+#include "nsCOMPtr.h"
+
+// This specialization is private to nsCOMArray.
+// It exists solely to automatically zero-out newly created array elements.
+template<>
+class nsTArrayElementTraits<nsISupports*>
+{
+  typedef nsISupports* E;
+public:
+  // Zero out the value
+  static inline void Construct(E* aE)
+  {
+    new (mozilla::KnownNotNull, static_cast<void*>(aE)) E();
+  }
+  // Invoke the copy-constructor in place.
+  template<class A>
+  static inline void Construct(E* aE, const A& aArg)
+  {
+    new (mozilla::KnownNotNull, static_cast<void*>(aE)) E(aArg);
+  }
+  // Invoke the destructor in place.
+  static inline void Destruct(E* aE)
+  {
+    aE->~E();
+  }
+};
+
+static void ReleaseObjects(nsTArray<nsISupports*>& aArray);
+
+// implementations of non-trivial methods in nsCOMArray_base
+
+nsCOMArray_base::nsCOMArray_base(const nsCOMArray_base& aOther)
+{
+  // make sure we do only one allocation
+  mArray.SetCapacity(aOther.Count());
+  AppendObjects(aOther);
+}
+
+nsCOMArray_base::~nsCOMArray_base()
+{
+  Clear();
+}
+
+int32_t
+nsCOMArray_base::IndexOf(nsISupports* aObject, uint32_t aStartIndex) const
+{
+  return mArray.IndexOf(aObject, aStartIndex);
+}
+
+int32_t
+nsCOMArray_base::IndexOfObject(nsISupports* aObject) const
+{
+  nsCOMPtr<nsISupports> supports = do_QueryInterface(aObject);
+  if (NS_WARN_IF(!supports)) {
+    return -1;
+  }
+
+  uint32_t i, count;
+  int32_t retval = -1;
+  count = mArray.Length();
+  for (i = 0; i < count; ++i) {
+    nsCOMPtr<nsISupports> arrayItem = do_QueryInterface(mArray[i]);
+    if (arrayItem == supports) {
+      retval = i;
+      break;
+    }
+  }
+  return retval;
+}
+
+bool
+nsCOMArray_base::EnumerateForwards(nsBaseArrayEnumFunc aFunc, void* aData) const
+{
+  for (uint32_t index = 0; index < mArray.Length(); ++index) {
+    if (!(*aFunc)(mArray[index], aData)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool
+nsCOMArray_base::EnumerateBackwards(nsBaseArrayEnumFunc aFunc, void* aData) const
+{
+  for (uint32_t index = mArray.Length(); index--; ) {
+    if (!(*aFunc)(mArray[index], aData)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+int
+nsCOMArray_base::nsCOMArrayComparator(const void* aElement1,
+                                      const void* aElement2,
+                                      void* aData)
+{
+  nsCOMArrayComparatorContext* ctx =
+    static_cast<nsCOMArrayComparatorContext*>(aData);
+  return (*ctx->mComparatorFunc)(*static_cast<nsISupports* const*>(aElement1),
+                                 *static_cast<nsISupports* const*>(aElement2),
+                                 ctx->mData);
+}
+
+void
+nsCOMArray_base::Sort(nsBaseArrayComparatorFunc aFunc, void* aData)
+{
+  if (mArray.Length() > 1) {
+    nsCOMArrayComparatorContext ctx = {aFunc, aData};
+    NS_QuickSort(mArray.Elements(), mArray.Length(), sizeof(nsISupports*),
+                 nsCOMArrayComparator, &ctx);
+  }
+}
+
+bool
+nsCOMArray_base::InsertObjectAt(nsISupports* aObject, int32_t aIndex)
+{
+  if ((uint32_t)aIndex > mArray.Length()) {
+    return false;
+  }
+
+  if (!mArray.InsertElementAt(aIndex, aObject)) {
+    return false;
+  }
+
+  NS_IF_ADDREF(aObject);
+  return true;
+}
+
+void
+nsCOMArray_base::InsertElementAt(uint32_t aIndex, nsISupports* aElement)
+{
+  mArray.InsertElementAt(aIndex, aElement);
+  NS_IF_ADDREF(aElement);
+}
+
+void
+nsCOMArray_base::InsertElementAt(uint32_t aIndex, already_AddRefed<nsISupports> aElement)
+{
+  mArray.InsertElementAt(aIndex, aElement.take());
+}
+
+bool
+nsCOMArray_base::InsertObjectsAt(const nsCOMArray_base& aObjects, int32_t aIndex)
+{
+  if ((uint32_t)aIndex > mArray.Length()) {
+    return false;
+  }
+
+  if (!mArray.InsertElementsAt(aIndex, aObjects.mArray)) {
+    return false;
+  }
+
+  // need to addref all these
+  uint32_t count = aObjects.Length();
+  for (uint32_t i = 0; i < count; ++i) {
+    NS_IF_ADDREF(aObjects[i]);
+  }
+
+  return true;
+}
+
+void
+nsCOMArray_base::InsertElementsAt(uint32_t aIndex,
+                                  const nsCOMArray_base& aElements)
+{
+  mArray.InsertElementsAt(aIndex, aElements.mArray);
+
+  // need to addref all these
+  uint32_t count = aElements.Length();
+  for (uint32_t i = 0; i < count; ++i) {
+    NS_IF_ADDREF(aElements[i]);
+  }
+}
+
+void
+nsCOMArray_base::InsertElementsAt(uint32_t aIndex,
+                                  nsISupports* const* aElements,
+                                  uint32_t aCount)
+{
+  mArray.InsertElementsAt(aIndex, aElements, aCount);
+
+  // need to addref all these
+  for (uint32_t i = 0; i < aCount; ++i) {
+    NS_IF_ADDREF(aElements[i]);
+  }
+}
+
+void
+nsCOMArray_base::ReplaceObjectAt(nsISupports* aObject, int32_t aIndex)
+{
+  mArray.EnsureLengthAtLeast(aIndex + 1);
+  nsISupports* oldObject = mArray[aIndex];
+  // Make sure to addref first, in case aObject == oldObject
+  NS_IF_ADDREF(mArray[aIndex] = aObject);
+  NS_IF_RELEASE(oldObject);
+}
+
+bool
+nsCOMArray_base::RemoveObject(nsISupports* aObject)
+{
+  bool result = mArray.RemoveElement(aObject);
+  if (result) {
+    NS_IF_RELEASE(aObject);
+  }
+  return result;
+}
+
+bool
+nsCOMArray_base::RemoveObjectAt(int32_t aIndex)
+{
+  if (uint32_t(aIndex) < mArray.Length()) {
+    nsISupports* element = mArray[aIndex];
+
+    mArray.RemoveElementAt(aIndex);
+    NS_IF_RELEASE(element);
+    return true;
+  }
+
+  return false;
+}
+
+void
+nsCOMArray_base::RemoveElementAt(uint32_t aIndex)
+{
+  nsISupports* element = mArray[aIndex];
+  mArray.RemoveElementAt(aIndex);
+  NS_IF_RELEASE(element);
+}
+
+bool
+nsCOMArray_base::RemoveObjectsAt(int32_t aIndex, int32_t aCount)
+{
+  if (uint32_t(aIndex) + uint32_t(aCount) <= mArray.Length()) {
+    nsTArray<nsISupports*> elementsToDestroy(aCount);
+    elementsToDestroy.AppendElements(mArray.Elements() + aIndex, aCount);
+    mArray.RemoveElementsAt(aIndex, aCount);
+    ReleaseObjects(elementsToDestroy);
+    return true;
+  }
+
+  return false;
+}
+
+void
+nsCOMArray_base::RemoveElementsAt(uint32_t aIndex, uint32_t aCount)
+{
+  nsTArray<nsISupports*> elementsToDestroy(aCount);
+  elementsToDestroy.AppendElements(mArray.Elements() + aIndex, aCount);
+  mArray.RemoveElementsAt(aIndex, aCount);
+  ReleaseObjects(elementsToDestroy);
+}
+
+// useful for destructors
+void
+ReleaseObjects(nsTArray<nsISupports*>& aArray)
+{
+  for (uint32_t i = 0; i < aArray.Length(); ++i) {
+    NS_IF_RELEASE(aArray[i]);
+  }
+}
+
+void
+nsCOMArray_base::Clear()
+{
+  nsTArray<nsISupports*> objects;
+  objects.SwapElements(mArray);
+  ReleaseObjects(objects);
+}
+
+bool
+nsCOMArray_base::SetCount(int32_t aNewCount)
+{
+  NS_ASSERTION(aNewCount >= 0, "SetCount(negative index)");
+  if (aNewCount < 0) {
+    return false;
+  }
+
+  int32_t count = mArray.Length();
+  if (count > aNewCount) {
+    RemoveObjectsAt(aNewCount, mArray.Length() - aNewCount);
+  }
+  mArray.SetLength(aNewCount);
+  return true;
+}
+
+void
+nsCOMArray_base::Adopt(nsISupports** aElements, uint32_t aSize)
+{
+  Clear();
+  mArray.AppendElements(aElements, aSize);
+
+  // Free the allocated array as well.
+  NS_Free(aElements);
+}
+
+uint32_t
+nsCOMArray_base::Forget(nsISupports*** aElements)
+{
+  uint32_t length = Length();
+  size_t array_size = sizeof(nsISupports*) * length;
+  nsISupports** array = static_cast<nsISupports**>(NS_Alloc(array_size));
+  memmove(array, Elements(), array_size);
+  *aElements = array;
+  // Don't Release the contained pointers; the caller of the method will
+  // do this eventually.
+  mArray.Clear();
+
+  return length;
+}