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LibJS: Return early from Interpreter on unhandled exception

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If we don't have a local unwind context to handle the exception, we can
just return right away. This allows us to remove one check from the
inner loop.
This commit is contained in:
Andreas Kling 2023-09-26 17:14:59 +02:00
parent c9eff35b96
commit 39cfb64269
1 changed files with 3 additions and 5 deletions
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8
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -173,14 +173,15 @@ void Interpreter::run_bytecode()
while (!pc.at_end()) { while (!pc.at_end()) {
auto& instruction = *pc; auto& instruction = *pc;
auto ran_or_error = instruction.execute(*this); auto ran_or_error = instruction.execute(*this);
if (ran_or_error.is_error()) [[unlikely]] { if (ran_or_error.is_error()) [[unlikely]] {
reg(Register::exception()) = *ran_or_error.throw_completion().value(); reg(Register::exception()) = *ran_or_error.throw_completion().value();
if (unwind_contexts().is_empty()) if (unwind_contexts().is_empty())
break; return;
auto& unwind_context = unwind_contexts().last(); auto& unwind_context = unwind_contexts().last();
if (unwind_context.executable != m_current_executable) if (unwind_context.executable != m_current_executable)
break; return;
if (unwind_context.handler && !unwind_context.handler_called) { if (unwind_context.handler && !unwind_context.handler_called) {
vm().running_execution_context().lexical_environment = unwind_context.lexical_environment; vm().running_execution_context().lexical_environment = unwind_context.lexical_environment;
m_current_block = unwind_context.handler; m_current_block = unwind_context.handler;
@ -234,9 +235,6 @@ void Interpreter::run_bytecode()
if (pc.at_end()) if (pc.at_end())
break; break;
if (!reg(Register::exception()).is_empty())
break;
if (will_return) if (will_return)
break; break;
} }