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// 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