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LibJS: Teach GetVariable bytecode op to deal with global variable cache

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This mirrors the behavior of Identifer::to_reference() in the AST
interpreter.
This commit is contained in:
Andreas Kling 2022-11-11 15:24:57 +01:00
parent cf046dbfdb
commit 2d33b2996f
1 changed files with 10 additions and 5 deletions
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15
Userland/Libraries/LibJS/Bytecode/Op.cpp
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@ -358,11 +358,16 @@ ThrowCompletionOr<void> GetVariable::execute_impl(Bytecode::Interpreter& interpr
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());
Environment* environment = nullptr;
if (m_cached_environment_coordinate->index == EnvironmentCoordinate::global_marker) {
environment = &interpreter.vm().current_realm()->global_environment();
} else {
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 };
}