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LibJS: Add basic support for while loops in the bytecode engine
This introduces two new instructions: Jump and JumpIfFalse. Jumps are made to a Bytecode::Label, which is a simple object that represents a location in the bytecode stream. Note that you may not always know the target of a jump when adding the jump instruction itself, but we can just update the instruction later on during codegen once we know where the jump target is. The Bytecode::Interpreter now implements jumping via a jump slot that gets checked after each instruction to see if a jump is pending. If not, we just increment the PC as usual.
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9 changed files with 128 additions and 1 deletions
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@ -370,6 +370,7 @@ 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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NonnullRefPtr<Expression> m_test;
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