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949ceedaed
This partially reverts c6ce7c9326.
The munmap part of that change was good, but we can't seal the blocks
since that breaks NewString and other ops that have String members.
67 lines
1.5 KiB
C++
67 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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