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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/OwnPtr.h>
#include <LibJS/Bytecode/Block.h>
#include <LibJS/Bytecode/Label.h>
#include <LibJS/Forward.h>
namespace JS::Bytecode {
class Generator {
public:
static OwnPtr<Block> generate(ASTNode const&);
Register allocate_register();
template<typename OpType, typename... Args>
InstructionHandle<OpType> emit(Args&&... args)
{
return make_instruction<OpType>(0, forward<Args>(args)...);
}
template<typename OpType, typename... Args>
InstructionHandle<OpType> emit_with_extra_register_slots(size_t extra_register_slots, Args&&... args)
{
return make_instruction<OpType>(extra_register_slots, forward<Args>(args)...);
}
Label make_label() const;
void begin_continuable_scope();
void end_continuable_scope();
Label nearest_continuable_scope() const;
private:
Generator();
~Generator();
template<typename OpType, typename... Args>
InstructionHandle<OpType> make_instruction(size_t extra_register_slots, Args&&... args)
{
auto& buffer = m_block->buffer();
auto offset = buffer.size();
buffer.resize(buffer.size() + sizeof(OpType) + extra_register_slots * sizeof(Register));
new (buffer.data() + offset) OpType(forward<Args>(args)...);
return InstructionHandle<OpType>(offset, m_block);
}
OwnPtr<Block> m_block;
u32 m_next_register { 1 };
Vector<Label> m_continuable_scopes;
};
}
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