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https://github.com/RGBCube/serenity
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LibJS: Add LoadArgument bytecode instruction for fast argument access
This is generated for Identifier nodes that represent a function argument variable. It loads a given argument index from the current call frame into the accumulator.
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parent
848944113c
commit
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4 changed files with 31 additions and 1 deletions
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@ -260,6 +260,9 @@ void StringLiteral::generate_bytecode(Bytecode::Generator& generator) const
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void Identifier::generate_bytecode(Bytecode::Generator& generator) const
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{
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if (m_argument_index.has_value())
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generator.emit<Bytecode::Op::LoadArgument>(m_argument_index.value());
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else
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generator.emit<Bytecode::Op::GetVariable>(generator.intern_string(m_string));
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}
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@ -61,6 +61,7 @@
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O(Decrement) \
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O(Throw) \
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O(PushLexicalEnvironment) \
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O(LoadArgument) \
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O(EnterUnwindContext) \
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O(LeaveUnwindContext) \
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O(ContinuePendingUnwind) \
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@ -311,6 +311,11 @@ void PutByValue::execute(Bytecode::Interpreter& interpreter) const
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}
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}
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void LoadArgument::execute(Bytecode::Interpreter& interpreter) const
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{
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interpreter.accumulator() = interpreter.vm().argument(m_index);
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}
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String Load::to_string(Bytecode::Executable const&) const
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{
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return String::formatted("Load {}", m_src);
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@ -493,4 +498,9 @@ String PutByValue::to_string(const Bytecode::Executable&) const
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return String::formatted("PutByValue base:{}, property:{}", m_base, m_property);
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}
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String LoadArgument::to_string(const Bytecode::Executable&) const
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{
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return String::formatted("LoadArgument {}", m_index);
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}
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}
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@ -529,6 +529,22 @@ public:
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private:
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HashMap<u32, Variable> m_variables;
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};
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class LoadArgument final : public Instruction {
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public:
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explicit LoadArgument(size_t index)
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: Instruction(Type::LoadArgument)
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, m_index(index)
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{
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}
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void execute(Bytecode::Interpreter&) const;
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String to_string(Bytecode::Executable const&) const;
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private:
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size_t m_index { 0 };
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};
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}
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namespace JS::Bytecode {
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