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 #include "mozilla/Span.h"
8
9 using namespace mozilla;
10
nsHtml5OwningUTF16Buffer(char16_t * aBuffer)11 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(char16_t* aBuffer)
12 : nsHtml5UTF16Buffer(aBuffer, 0), next(nullptr), key(nullptr) {}
13
nsHtml5OwningUTF16Buffer(void * aKey)14 nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(void* aKey)
15 : nsHtml5UTF16Buffer(nullptr, 0), next(nullptr), key(aKey) {}
16
~nsHtml5OwningUTF16Buffer()17 nsHtml5OwningUTF16Buffer::~nsHtml5OwningUTF16Buffer() {
18 DeleteBuffer();
19
20 // This is to avoid dtor recursion on 'next', bug 706932.
21 RefPtr<nsHtml5OwningUTF16Buffer> tail;
22 tail.swap(next);
23 while (tail && tail->mRefCnt == 1) {
24 RefPtr<nsHtml5OwningUTF16Buffer> tmp;
25 tmp.swap(tail->next);
26 tail.swap(tmp);
27 }
28 }
29
30 // static
31 already_AddRefed<nsHtml5OwningUTF16Buffer>
FalliblyCreate(int32_t aLength)32 nsHtml5OwningUTF16Buffer::FalliblyCreate(int32_t aLength) {
33 char16_t* newBuf = new (mozilla::fallible) char16_t[aLength];
34 if (!newBuf) {
35 return nullptr;
36 }
37 RefPtr<nsHtml5OwningUTF16Buffer> newObj =
38 new (mozilla::fallible) nsHtml5OwningUTF16Buffer(newBuf);
39 if (!newObj) {
40 delete[] newBuf;
41 return nullptr;
42 }
43 return newObj.forget();
44 }
45
Swap(nsHtml5OwningUTF16Buffer * aOther)46 void nsHtml5OwningUTF16Buffer::Swap(nsHtml5OwningUTF16Buffer* aOther) {
47 nsHtml5UTF16Buffer::Swap(aOther);
48 }
49
TailAsSpan(int32_t aBufferSize)50 Span<char16_t> nsHtml5OwningUTF16Buffer::TailAsSpan(int32_t aBufferSize) {
51 MOZ_ASSERT(aBufferSize >= getEnd());
52 return {getBuffer() + getEnd(), static_cast<size_t>(aBufferSize - getEnd())};
53 }
54
AdvanceEnd(int32_t aNumberOfCodeUnits)55 void nsHtml5OwningUTF16Buffer::AdvanceEnd(int32_t aNumberOfCodeUnits) {
56 setEnd(getEnd() + aNumberOfCodeUnits);
57 }
58
59 // Not using macros for AddRef and Release in order to be able to refcount on
60 // and create on different threads.
61
AddRef()62 nsrefcnt nsHtml5OwningUTF16Buffer::AddRef() {
63 MOZ_ASSERT(int32_t(mRefCnt) >= 0, "Illegal refcount.");
64 ++mRefCnt;
65 NS_LOG_ADDREF(this, mRefCnt, "nsHtml5OwningUTF16Buffer", sizeof(*this));
66 return mRefCnt;
67 }
68
Release()69 nsrefcnt nsHtml5OwningUTF16Buffer::Release() {
70 MOZ_ASSERT(0 != mRefCnt, "Release without AddRef.");
71 --mRefCnt;
72 NS_LOG_RELEASE(this, mRefCnt, "nsHtml5OwningUTF16Buffer");
73 if (mRefCnt == 0) {
74 mRefCnt = 1; /* stabilize */
75 delete this;
76 return 0;
77 }
78 return mRefCnt;
79 }
80