| // Copyright 2022 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #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) { |
| DAWN_ASSERT(IsPowerOfTwo(alignment)); |
| DAWN_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); |
| DAWN_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. |
| DAWN_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 |