parser/html/nsHtml5OwningUTF16Buffer.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "nsHtml5OwningUTF16Buffer.h"
   6
   7 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(char16_t* aBuffer)
   8   : nsHtml5UTF16Buffer(aBuffer, 0),
   9     next(nullptr),
  10     key(nullptr)
  11 {
  12   MOZ_COUNT_CTOR(nsHtml5OwningUTF16Buffer);
  13 }
  14
  15 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(void* aKey)
  16   : nsHtml5UTF16Buffer(nullptr, 0),
  17     next(nullptr),
  18     key(aKey)
  19 {
  20   MOZ_COUNT_CTOR(nsHtml5OwningUTF16Buffer);
  21 }
  22
  23 nsHtml5OwningUTF16Buffer::~nsHtml5OwningUTF16Buffer()
  24 {
  25   MOZ_COUNT_DTOR(nsHtml5OwningUTF16Buffer);
  26   DeleteBuffer();
  27
  28   // This is to avoid dtor recursion on 'next', bug 706932.
  29   nsRefPtr<nsHtml5OwningUTF16Buffer> tail;
  30   tail.swap(next);
  31   while (tail && tail->mRefCnt == 1) {
  32     nsRefPtr<nsHtml5OwningUTF16Buffer> tmp;
  33     tmp.swap(tail->next);
  34     tail.swap(tmp);
  35   }
  36 }
  37
  38 // static
  39 already_AddRefed<nsHtml5OwningUTF16Buffer>
  40 nsHtml5OwningUTF16Buffer::FalliblyCreate(int32_t aLength)
  41 {
  42   const mozilla::fallible_t fallible = mozilla::fallible_t();
  43   char16_t* newBuf = new (fallible) char16_t[aLength];
  44   if (!newBuf) {
  45     return nullptr;
  46   }
  47   nsRefPtr<nsHtml5OwningUTF16Buffer> newObj =
  48     new (fallible) nsHtml5OwningUTF16Buffer(newBuf);
  49   if (!newObj) {
  50     delete[] newBuf;
  51     return nullptr;
  52   }
  53   return newObj.forget();
  54 }
  55
  56 void
  57 nsHtml5OwningUTF16Buffer::Swap(nsHtml5OwningUTF16Buffer* aOther)
  58 {
  59   nsHtml5UTF16Buffer::Swap(aOther);
  60 }
  61
  62
  63 // Not using macros for AddRef and Release in order to be able to refcount on
  64 // and create on different threads.
  65
  66 nsrefcnt
  67 nsHtml5OwningUTF16Buffer::AddRef()
  68 {
  69   NS_PRECONDITION(int32_t(mRefCnt) >= 0, "Illegal refcount.");
  70   ++mRefCnt;
  71   NS_LOG_ADDREF(this, mRefCnt, "nsHtml5OwningUTF16Buffer", sizeof(*this));
  72   return mRefCnt;
  73 }
  74
  75 nsrefcnt
  76 nsHtml5OwningUTF16Buffer::Release()
  77 {
  78   NS_PRECONDITION(0 != mRefCnt, "Release without AddRef.");
  79   --mRefCnt;
  80   NS_LOG_RELEASE(this, mRefCnt, "nsHtml5OwningUTF16Buffer");
  81   if (mRefCnt == 0) {
  82     mRefCnt = 1; /* stabilize */
  83     delete this;
  84     return 0;
  85   }
  86   return mRefCnt;
  87 }