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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.
*/
#include "config.h"
#include "ASTBuilder.h"
#include "ASTNode.h"
namespace WGSL::AST {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(WGSLAST);
Builder::Builder(Builder&& other)
{
m_arena = std::exchange(other.m_arena, nullptr);
m_arenaEnd = std::exchange(other.m_arenaEnd, nullptr);
m_arenas = WTFMove(other.m_arenas);
m_nodes = WTFMove(other.m_nodes);
}
inline uint8_t* Builder::arena()
{
ASSERT(m_arenaEnd);
return m_arenaEnd - arenaSize;
}
Builder::~Builder()
{
size_t size = m_nodes.size();
for (size_t i = 0; i < size; ++i)
m_nodes[i]->~Node();
}
void Builder::allocateArena()
{
m_arenas.append(MallocPtr<uint8_t, WGSLASTMalloc>::malloc(arenaSize));
m_arena = m_arenas.last().get();
m_arenaEnd = m_arena + arenaSize;
ASSERT(arena() == m_arena);
}
auto Builder::saveCurrentState() -> State
{
State state;
state.m_arena = m_arena;
#if ASSERT_ENABLED
state.m_arenaEnd = m_arenaEnd;
if (m_arenaEnd)
state.m_arenaStart = arena();
else
state.m_arenaStart = nullptr;
#endif
state.m_numberOfArenas = m_arenas.size();
state.m_numberOfNodes = m_nodes.size();
allocateArena();
return state;
}
void Builder::restore(State&& state)
{
for (size_t i = state.m_numberOfNodes; i < m_nodes.size(); ++i)
m_nodes[i]->~Node();
m_nodes.shrink(state.m_numberOfNodes);
m_arena = state.m_arena;
m_arenas.shrink(state.m_numberOfArenas);
if (m_arenas.isEmpty())
m_arenaEnd = nullptr;
else {
m_arenaEnd = m_arenas.last().get() + arenaSize;
#if ASSERT_ENABLED
ASSERT(state.m_arenaStart == m_arenas.last().get());
ASSERT(state.m_arenaEnd == m_arenaEnd);
#endif
}
}
} // namespace WGSL::AST
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