| // Copyright 2022 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <utility> |
| |
| #include "dawn/common/Assert.h" |
| #include "dawn/common/Math.h" |
| #include "dawn/native/Blob.h" |
| #include "dawn/native/stream/Stream.h" |
| |
| namespace dawn::native { |
| |
| Blob CreateBlob(size_t size, size_t alignment) { |
| ASSERT(IsPowerOfTwo(alignment)); |
| ASSERT(alignment != 0); |
| if (size > 0) { |
| // Allocate extra space so that there will be sufficient space for |size| even after |
| // the |data| pointer is aligned. |
| // TODO(crbug.com/dawn/824): Use aligned_alloc when possible. It should be available |
| // with C++17 but on macOS it also requires macOS 10.15 to work. |
| size_t allocatedSize = size + alignment - 1; |
| uint8_t* data = new uint8_t[allocatedSize]; |
| uint8_t* ptr = AlignPtr(data, alignment); |
| ASSERT(ptr + size <= data + allocatedSize); |
| return Blob::UnsafeCreateWithDeleter(ptr, size, [=] { delete[] data; }); |
| } else { |
| return Blob(); |
| } |
| } |
| |
| // static |
| Blob Blob::UnsafeCreateWithDeleter(uint8_t* data, size_t size, std::function<void()> deleter) { |
| return Blob(data, size, deleter); |
| } |
| |
| Blob::Blob() : mData(nullptr), mSize(0), mDeleter({}) {} |
| |
| Blob::Blob(uint8_t* data, size_t size, std::function<void()> deleter) |
| : mData(data), mSize(size), mDeleter(std::move(deleter)) { |
| // It is invalid to make a blob that has null data unless its size is also zero. |
| ASSERT(data != nullptr || size == 0); |
| } |
| |
| Blob::Blob(Blob&& rhs) : mData(rhs.mData), mSize(rhs.mSize) { |
| mDeleter = std::move(rhs.mDeleter); |
| rhs.mDeleter = nullptr; |
| } |
| |
| Blob& Blob::operator=(Blob&& rhs) { |
| mData = rhs.mData; |
| mSize = rhs.mSize; |
| if (mDeleter) { |
| mDeleter(); |
| } |
| mDeleter = std::move(rhs.mDeleter); |
| rhs.mDeleter = nullptr; |
| return *this; |
| } |
| |
| Blob::~Blob() { |
| if (mDeleter) { |
| mDeleter(); |
| } |
| } |
| |
| bool Blob::Empty() const { |
| return mSize == 0; |
| } |
| |
| const uint8_t* Blob::Data() const { |
| return mData; |
| } |
| |
| uint8_t* Blob::Data() { |
| return mData; |
| } |
| |
| size_t Blob::Size() const { |
| return mSize; |
| } |
| |
| void Blob::AlignTo(size_t alignment) { |
| if (IsPtrAligned(mData, alignment)) { |
| return; |
| } |
| |
| Blob blob = CreateBlob(mSize, alignment); |
| memcpy(blob.Data(), mData, mSize); |
| *this = std::move(blob); |
| } |
| |
| template <> |
| void stream::Stream<Blob>::Write(stream::Sink* s, const Blob& b) { |
| size_t size = b.Size(); |
| StreamIn(s, size); |
| if (size > 0) { |
| void* ptr = s->GetSpace(size); |
| memcpy(ptr, b.Data(), size); |
| } |
| } |
| |
| template <> |
| MaybeError stream::Stream<Blob>::Read(stream::Source* s, Blob* b) { |
| size_t size; |
| DAWN_TRY(StreamOut(s, &size)); |
| if (size > 0) { |
| const void* ptr; |
| DAWN_TRY(s->Read(&ptr, size)); |
| *b = CreateBlob(size); |
| memcpy(b->Data(), ptr, size); |
| } else { |
| *b = Blob(); |
| } |
| return {}; |
| } |
| |
| } // namespace dawn::native |