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LibJS: Remove unnecessary malloc+free in AssignmentExpression::execute

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We were creating a temporary AK::Function for no good reason, and this
was dominating profiles. Reorganize the code so it's not necessary.
This commit is contained in:
Andreas Kling 2020-04-05 19:21:36 +02:00
parent 76bb0fab2d
commit 6e7713a5f4
1 changed files with 13 additions and 18 deletions
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31
Libraries/LibJS/AST.cpp
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@ -651,23 +651,6 @@ void Identifier::dump(int indent) const
Value AssignmentExpression::execute(Interpreter& interpreter) const Value AssignmentExpression::execute(Interpreter& interpreter) const
{ {
AK::Function<void(Value)> commit;
if (m_lhs->is_identifier()) {
commit = [&](Value value) {
auto name = static_cast<const Identifier&>(*m_lhs).string();
interpreter.set_variable(name, value);
};
} else if (m_lhs->is_member_expression()) {
commit = [&](Value value) {
if (auto* object = static_cast<const MemberExpression&>(*m_lhs).object().execute(interpreter).to_object(interpreter.heap())) {
auto property_name = static_cast<const MemberExpression&>(*m_lhs).computed_property_name(interpreter);
object->put(property_name, value);
}
};
} else {
ASSERT_NOT_REACHED();
}
auto rhs_result = m_rhs->execute(interpreter); auto rhs_result = m_rhs->execute(interpreter);
if (interpreter.exception()) if (interpreter.exception())
return {}; return {};
@ -690,7 +673,19 @@ Value AssignmentExpression::execute(Interpreter& interpreter) const
} }
if (interpreter.exception()) if (interpreter.exception())
return {}; return {};
commit(rhs_result);
if (m_lhs->is_identifier()) {
auto name = static_cast<const Identifier&>(*m_lhs).string();
interpreter.set_variable(name, rhs_result);
} else if (m_lhs->is_member_expression()) {
if (auto* object = static_cast<const MemberExpression&>(*m_lhs).object().execute(interpreter).to_object(interpreter.heap())) {
auto property_name = static_cast<const MemberExpression&>(*m_lhs).computed_property_name(interpreter);
object->put(property_name, rhs_result);
}
} else {
ASSERT_NOT_REACHED();
}
return rhs_result; return rhs_result;
} }