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/*
* Copyright (C) 2024-2025 Apple Inc. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#pragma once
#include <utility>
#include <wtf/AllocSpanMixin.h>
#include <wtf/FastMalloc.h>
#include <wtf/MallocCommon.h>
#include <wtf/SystemMalloc.h>
#include <wtf/TypeTraits.h>
// MallocSpan is a smart pointer class that wraps a std::span and calls fastFree in its destructor.
namespace WTF {
template<typename T, typename Malloc = FastMalloc> class MallocSpan : public AllocSpanMixin<T> {
WTF_MAKE_CONFIGURABLE_ALLOCATED(Malloc);
public:
MallocSpan() = default;
MallocSpan(MallocSpan&& other)
: AllocSpanMixin<T>(WTFMove(other))
{
}
template<typename U>
MallocSpan(MallocSpan<U, Malloc>&& other) requires (std::is_same_v<T, uint8_t>)
: AllocSpanMixin<T>(asWritableBytes(other.leakSpan()))
{
}
~MallocSpan()
{
auto span = this->mutableSpan();
if constexpr (parameterCount(Malloc::free) == 2)
Malloc::free(span.data(), span.size());
else
Malloc::free(span.data());
}
MallocSpan& operator=(MallocSpan&& other)
{
MallocSpan ptr { WTFMove(other) };
this->swap(ptr);
return *this;
}
static MallocSpan malloc(size_t sizeInBytes)
{
return MallocSpan { Malloc::malloc(sizeInBytes), sizeInBytes };
}
static MallocSpan zeroedMalloc(size_t sizeInBytes)
{
return MallocSpan { Malloc::zeroedMalloc(sizeInBytes), sizeInBytes };
}
static MallocSpan alignedMalloc(size_t alignment, size_t sizeInBytes)
{
return MallocSpan { Malloc::alignedMalloc(alignment, sizeInBytes), sizeInBytes };
}
static MallocSpan tryAlloc(size_t sizeInBytes)
{
return tryMalloc(sizeInBytes);
}
static MallocSpan tryMalloc(size_t sizeInBytes)
{
auto* ptr = Malloc::tryMalloc(sizeInBytes);
if (!ptr)
return { };
return MallocSpan { ptr, sizeInBytes };
}
static MallocSpan tryZeroedMalloc(size_t sizeInBytes)
{
auto* ptr = Malloc::tryZeroedMalloc(sizeInBytes);
if (!ptr)
return { };
return MallocSpan { ptr, sizeInBytes };
}
static MallocSpan tryAlignedMalloc(size_t alignment, size_t sizeInBytes)
{
auto* ptr = Malloc::tryAlignedMalloc(alignment, sizeInBytes);
if (!ptr)
return { };
return MallocSpan { ptr, sizeInBytes };
}
void realloc(size_t newSizeInBytes)
{
RELEASE_ASSERT(!(newSizeInBytes % sizeof(T)));
MallocSpan other { Malloc::realloc(this->leakSpan().data(), newSizeInBytes), newSizeInBytes };
this->swap(other);
}
private:
using AllocSpanMixin<T>::AllocSpanMixin;
template<typename U, typename OtherMalloc> friend MallocSpan<U, OtherMalloc> adoptMallocSpan(std::span<U>);
};
// Specialization for SystemMalloc to access <typename T>.
template<typename T> class MallocSpan<T, SystemMalloc> : public MallocSpan<T, SystemMallocBase<T>> {
public:
using Base = MallocSpan<T, SystemMallocBase<T>>;
using Base::Base;
MallocSpan() = default;
MallocSpan(MallocSpan&&) = default;
MallocSpan& operator=(MallocSpan&&) = default;
MallocSpan& operator=(Base&& other)
{
Base::operator=(WTFMove(other));
return *this;
}
};
template<typename U, typename OtherMalloc> MallocSpan<U, OtherMalloc> adoptMallocSpan(std::span<U> span)
{
return MallocSpan<U, OtherMalloc>(span.data(), span.size_bytes());
}
} // namespace WTF
using WTF::MallocSpan;
using WTF::adoptMallocSpan;
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