65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <LibJS/Forward.h>
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namespace JS::Bytecode {
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class InstructionStreamIterator {
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public:
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explicit InstructionStreamIterator(ReadonlyBytes bytes)
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: m_bytes(bytes)
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{
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}
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size_t offset() const { return m_offset; }
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bool at_end() const { return m_offset >= m_bytes.size(); }
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void jump(size_t offset)
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{
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VERIFY(offset <= m_bytes.size());
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m_offset = offset;
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}
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Instruction const& operator*() const { return dereference(); }
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void operator++();
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private:
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Instruction const& dereference() const { return *reinterpret_cast<Instruction const*>(m_bytes.data() + offset()); }
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ReadonlyBytes m_bytes;
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size_t m_offset { 0 };
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};
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class Block {
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public:
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static NonnullOwnPtr<Block> create();
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~Block();
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void seal();
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void dump() const;
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ReadonlyBytes instruction_stream() const { return ReadonlyBytes { m_buffer, m_buffer_size }; }
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size_t register_count() const { return m_register_count; }
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void set_register_count(Badge<Bytecode::Generator>, size_t count) { m_register_count = count; }
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void* next_slot() { return m_buffer + m_buffer_size; }
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void grow(size_t additional_size);
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private:
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Block();
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size_t m_register_count { 0 };
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u8* m_buffer { nullptr };
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size_t m_buffer_capacity { 0 };
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size_t m_buffer_size { 0 };
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};
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}
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