blob: cecac30e4f1e1115282b0765999b406be4268410 [file] [log] [blame]
// 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"
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);
}
} // namespace dawn::native