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https://github.com/RGBCube/serenity
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69dddd4ef5
This patch begins the work of implementing JavaScript execution in a bytecode VM instead of an AST tree-walk interpreter. It's probably quite naive, but we have to start somewhere. The basic idea is that you call Bytecode::Generator::generate() on an AST node and it hands you back a Bytecode::Block filled with instructions that can then be interpreted by a Bytecode::Interpreter. This first version only implements two instructions: Load and Add. :^) Each bytecode block has infinity registers, and the interpreter resizes its register file to fit the block being executed. Two new `js` options are added in this patch as well: `-d` will dump the generated bytecode `-b` will execute the generated bytecode Note that unless `-d` and/or `-b` are specified, none of the bytecode related stuff in LibJS runs at all. This is implemented in parallel with the existing AST interpreter. :^)
52 lines
1 KiB
C++
52 lines
1 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 <LibJS/Bytecode/Instruction.h>
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#include <LibJS/Bytecode/Register.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS::Bytecode::Op {
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class Load final : public Instruction {
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public:
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Load(Register dst, Value value)
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: m_dst(dst)
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, m_value(value)
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{
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}
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virtual ~Load() override { }
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virtual void execute(Bytecode::Interpreter&) const override;
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virtual String to_string() const override;
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private:
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Register m_dst;
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Value m_value;
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};
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class Add final : public Instruction {
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public:
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Add(Register dst, Register src1, Register src2)
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: m_dst(dst)
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, m_src1(src1)
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, m_src2(src2)
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{
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}
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virtual ~Add() override { }
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virtual void execute(Bytecode::Interpreter&) const override;
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virtual String to_string() const override;
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private:
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Register m_dst;
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Register m_src1;
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Register m_src2;
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};
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}
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