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LibJS: Do less work in successfully cached GetByValue* ops

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If we have a cached environment coordinate that hasn't been screwed
by eval(), we can get the value directly without instantiating a
Reference.

15% speed-up on Octane/zlib.js :^)
This commit is contained in:
Andreas Kling 2023-10-07 18:15:49 +02:00
parent 6f1f0710f8
commit ae4e46a037
1 changed files with 35 additions and 36 deletions
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71
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -812,26 +812,23 @@ ThrowCompletionOr<void> GetVariable::execute_impl(Bytecode::Interpreter& interpr
{
auto& vm = interpreter.vm();
auto get_reference = [&]() -> ThrowCompletionOr<Reference> {
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
if (m_cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
return Reference { *environment, string, vm.in_strict_mode(), m_cached_environment_coordinate };
}
m_cached_environment_coordinate = {};
if (m_cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
interpreter.accumulator() = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, m_cached_environment_coordinate.value().index, vm.in_strict_mode()));
return {};
}
m_cached_environment_coordinate = {};
}
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
return reference;
};
auto reference = TRY(get_reference());
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
interpreter.accumulator() = TRY(reference.get_value(vm));
return {};
}
@ -840,26 +837,28 @@ ThrowCompletionOr<void> GetCalleeAndThisFromEnvironment::execute_impl(Bytecode::
{
auto& vm = interpreter.vm();
auto get_reference = [&]() -> ThrowCompletionOr<Reference> {
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
if (m_cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
return Reference { *environment, string, vm.in_strict_mode(), m_cached_environment_coordinate };
}
m_cached_environment_coordinate = {};
if (m_cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
interpreter.reg(m_callee_reg) = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, m_cached_environment_coordinate.value().index, vm.in_strict_mode()));
Value this_value = js_undefined();
if (auto base_object = environment->with_base_object())
this_value = base_object;
interpreter.reg(m_this_reg) = this_value;
return {};
}
m_cached_environment_coordinate = {};
}
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
return reference;
};
auto reference = TRY(get_reference());
interpreter.reg(m_callee_reg) = TRY(reference.get_value(vm));
Value this_value = js_undefined();