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LibJS: Inline bytecode ops for direct local/register access

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These can do a lot less stuff if we put them directly in the interpreter
loop and allow them to access the locals/registers arrays directly.
This commit is contained in:
Andreas Kling
2023-09-27 10:31:07 +02:00
parent ae1ac9871b
commit f3606adc58
2 changed files with 33 additions and 4 deletions
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33
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -178,6 +178,9 @@ ThrowCompletionOr<Value> Interpreter::run(SourceTextModule& module)
void Interpreter::run_bytecode()
{
auto* locals = vm().running_execution_context().local_variables.data();
auto* registers = this->registers().data();
auto& accumulator = this->accumulator();
for (;;) {
start:
auto pc = InstructionStreamIterator { m_current_block->instruction_stream(), m_current_executable };
@@ -192,23 +195,45 @@ void Interpreter::run_bytecode()
auto& instruction = *pc;
switch (instruction.type()) {
case Instruction::Type::GetLocal: {
auto& local = locals[static_cast<Op::GetLocal const&>(instruction).index()];
if (local.is_empty()) {
auto const& variable_name = vm().running_execution_context().function->local_variables_names()[static_cast<Op::GetLocal const&>(instruction).index()];
result = vm().throw_completion<ReferenceError>(ErrorType::BindingNotInitialized, variable_name);
break;
}
accumulator = local;
break;
}
case Instruction::Type::SetLocal:
locals[static_cast<Op::SetLocal const&>(instruction).index()] = accumulator;
break;
case Instruction::Type::Load:
accumulator = registers[static_cast<Op::Load const&>(instruction).src().index()];
break;
case Instruction::Type::Store:
registers[static_cast<Op::Store const&>(instruction).dst().index()] = accumulator;
break;
case Instruction::Type::LoadImmediate:
accumulator = static_cast<Op::LoadImmediate const&>(instruction).value();
break;
case Instruction::Type::Jump:
m_current_block = &static_cast<Op::Jump const&>(instruction).true_target()->block();
goto start;
case Instruction::Type::JumpConditional:
if (accumulator().to_boolean())
if (accumulator.to_boolean())
m_current_block = &static_cast<Op::Jump const&>(instruction).true_target()->block();
else
m_current_block = &static_cast<Op::Jump const&>(instruction).false_target()->block();
goto start;
case Instruction::Type::JumpNullish:
if (accumulator().is_nullish())
if (accumulator.is_nullish())
m_current_block = &static_cast<Op::Jump const&>(instruction).true_target()->block();
else
m_current_block = &static_cast<Op::Jump const&>(instruction).false_target()->block();
goto start;
case Instruction::Type::JumpUndefined:
if (accumulator().is_undefined())
if (accumulator.is_undefined())
m_current_block = &static_cast<Op::Jump const&>(instruction).true_target()->block();
else
m_current_block = &static_cast<Op::Jump const&>(instruction).false_target()->block();
@@ -257,7 +282,7 @@ void Interpreter::run_bytecode()
m_current_block = unwind_context.handler;
unwind_context.handler_called = true;
accumulator() = reg(Register::exception());
accumulator = reg(Register::exception());
reg(Register::exception()) = {};
goto start;
}