diff options
Diffstat (limited to 'xpcom/ds/nsCOMArray.cpp')
| -rw-r--r-- | xpcom/ds/nsCOMArray.cpp | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/xpcom/ds/nsCOMArray.cpp b/xpcom/ds/nsCOMArray.cpp new file mode 100644 index 0000000000..a7ce778e5c --- /dev/null +++ b/xpcom/ds/nsCOMArray.cpp @@ -0,0 +1,235 @@ +/* -*- 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); + } + // Construct in place. + template <class... Args> + static inline void Emplace(E* aE, Args&&... aArgs) { + new (mozilla::KnownNotNull, static_cast<void*>(aE)) + E(std::forward<Args>(aArgs)...); + } + // 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; +} + +bool nsCOMArray_base::InsertObjectAt(nsISupports* aObject, int32_t aIndex) { + if ((uint32_t)aIndex > mArray.Length()) { + return false; + } + + mArray.InsertElementAt(aIndex, aObject); + + 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; + } + + mArray.InsertElementsAt(aIndex, aObjects.mArray); + + // 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 = std::move(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; +} |