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/*
* Copyright (c) 2023 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. ``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
* 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 <wtf/NeverDestroyed.h>
#include <wtf/Noncopyable.h>
#include <wtf/Nonmovable.h>
#include <wtf/Vector.h>
#include <wtf/text/ParsingUtilities.h>
#define WGSL_AST_BUILDER_NODE(Node) \
protected: \
Node(const Node&) = default; \
Node(Node&&) = default; \
Node& operator=(const Node&) = default; \
Node& operator=(Node&&) = default; \
private: \
friend class Builder; \
friend ShaderModule;
namespace WGSL {
class ShaderModule;
namespace AST {
class Node;
class Builder {
WTF_MAKE_NONCOPYABLE(Builder);
public:
static constexpr size_t arenaSize = 0x4000;
Builder() = default;
Builder(Builder&&);
~Builder();
template<typename T, typename... Arguments, typename = std::enable_if_t<std::is_base_of_v<Node, T>>>
T& construct(Arguments&&... arguments)
{
constexpr size_t size = sizeof(T);
constexpr size_t alignedSize = alignSize(size);
static_assert(alignedSize <= arenaSize);
if (UNLIKELY(m_arena.size() < alignedSize))
allocateArena();
auto* node = new (m_arena.data()) T(std::forward<Arguments>(arguments)...);
skip(m_arena, alignedSize);
m_nodes.append(node);
return *node;
}
class State {
friend Builder;
private:
State() = default;
std::span<uint8_t> m_arena;
unsigned m_numberOfArenas;
unsigned m_numberOfNodes;
};
State saveCurrentState();
void restore(State&&);
private:
static constexpr size_t alignSize(size_t size)
{
return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1);
}
void allocateArena();
std::span<uint8_t> m_arena { };
uint8_t* m_arenaEnd { nullptr };
Vector<FixedVector<uint8_t>> m_arenas;
Vector<Node*> m_nodes;
};
} // namespace AST
} // namespace WGSL
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