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LibJS: Generate bytecode for do...while statements :^)
This was quite straightforward using the same label/jump machinery that we added for while statements. The main addition here is a new JumpIfTrue bytecode instruction.
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4 changed files with 45 additions and 0 deletions
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@ -391,6 +391,7 @@ 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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@ -105,4 +105,14 @@ Optional<Bytecode::Register> WhileStatement::generate_bytecode(Bytecode::Generat
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return body_result_reg;
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}
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Optional<Bytecode::Register> DoWhileStatement::generate_bytecode(Bytecode::Generator& generator) const
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{
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auto head_label = generator.make_label();
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auto body_result_reg = m_body->generate_bytecode(generator);
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auto test_result_reg = m_test->generate_bytecode(generator);
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VERIFY(test_result_reg.has_value());
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generator.emit<Bytecode::Op::JumpIfTrue>(*test_result_reg, head_label);
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return body_result_reg;
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}
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}
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@ -64,6 +64,14 @@ void JumpIfFalse::execute(Bytecode::Interpreter& interpreter) const
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interpreter.jump(m_target.value());
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}
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void JumpIfTrue::execute(Bytecode::Interpreter& interpreter) const
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{
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VERIFY(m_target.has_value());
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auto result = interpreter.reg(m_result);
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if (result.as_bool())
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interpreter.jump(m_target.value());
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}
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String Load::to_string() const
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{
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return String::formatted("Load dst:{}, value:{}", m_dst, m_value.to_string_without_side_effects());
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@ -116,4 +124,11 @@ String JumpIfFalse::to_string() const
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return String::formatted("JumpIfFalse result:{}, target:<empty>", m_result);
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}
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String JumpIfTrue::to_string() const
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{
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if (m_target.has_value())
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return String::formatted("JumpIfTrue result:{}, target:{}", m_result, m_target.value());
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return String::formatted("JumpIfTrue result:{}, target:<empty>", m_result);
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}
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}
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@ -193,4 +193,23 @@ private:
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Optional<Label> m_target;
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};
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class JumpIfTrue final : public Instruction {
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public:
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explicit JumpIfTrue(Register result, Optional<Label> target = {})
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: m_result(result)
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, m_target(move(target))
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{
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}
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void set_target(Optional<Label> target) { m_target = move(target); }
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virtual ~JumpIfTrue() 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_result;
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Optional<Label> m_target;
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};
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}
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