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LibJS: Start fleshing out a bytecode for the JavaScript engine :^)
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. :^)
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16 changed files with 487 additions and 24 deletions
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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@ -37,6 +37,7 @@ class ASTNode : public RefCounted<ASTNode> {
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public:
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virtual ~ASTNode() { }
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virtual Value execute(Interpreter&, GlobalObject&) const = 0;
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virtual Optional<Bytecode::Register> generate_bytecode(Bytecode::Generator&) const;
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virtual void dump(int indent) const;
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const SourceRange& source_range() const { return m_source_range; }
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@ -96,6 +97,7 @@ public:
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virtual Value execute(Interpreter&, GlobalObject&) const override;
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virtual void dump(int indent) const override;
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virtual Optional<Bytecode::Register> generate_bytecode(Bytecode::Generator&) const override;
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const Expression& expression() const { return m_expression; };
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@ -120,6 +122,7 @@ public:
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const NonnullRefPtrVector<Statement>& children() const { return m_children; }
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virtual Value execute(Interpreter&, GlobalObject&) const override;
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virtual void dump(int indent) const override;
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virtual Optional<Bytecode::Register> generate_bytecode(Bytecode::Generator&) const override;
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void add_variables(NonnullRefPtrVector<VariableDeclaration>);
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void add_functions(NonnullRefPtrVector<FunctionDeclaration>);
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@ -522,6 +525,7 @@ public:
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virtual Value execute(Interpreter&, GlobalObject&) const override;
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virtual void dump(int indent) const override;
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virtual Optional<Bytecode::Register> generate_bytecode(Bytecode::Generator&) const override;
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private:
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BinaryOp m_op;
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@ -630,6 +634,7 @@ public:
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virtual Value execute(Interpreter&, GlobalObject&) const override;
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virtual void dump(int indent) const override;
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virtual Optional<Bytecode::Register> generate_bytecode(Bytecode::Generator&) const override;
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private:
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Value m_value;
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