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LibJS: Implement basic support for the "new" keyword

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NewExpression mostly piggybacks on the existing CallExpression. The big
difference is that "new" creates a new Object and passes it as |this|
to the callee.
This commit is contained in:
Andreas Kling 2020-03-28 16:33:52 +01:00
parent fecbef4ffe
commit 0593ce406b
5 changed files with 67 additions and 9 deletions
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28
Libraries/LibJS/AST.cpp
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@ -80,18 +80,30 @@ Value CallExpression::execute(Interpreter& interpreter) const
return {};
}
if (m_callee->is_member_expression()) {
auto object_value = static_cast<const MemberExpression&>(*m_callee).object().execute(interpreter);
if (interpreter.exception())
return {};
auto this_value = object_value.to_object(interpreter.heap());
if (interpreter.exception())
return {};
call_frame.this_value = this_value;
Object* new_object = nullptr;
if (is_new_expression()) {
new_object = interpreter.heap().allocate<Object>();
call_frame.this_value = new_object;
} else {
if (m_callee->is_member_expression()) {
auto object_value = static_cast<const MemberExpression&>(*m_callee).object().execute(interpreter);
if (interpreter.exception())
return {};
auto this_value = object_value.to_object(interpreter.heap());
if (interpreter.exception())
return {};
call_frame.this_value = this_value;
}
}
auto result = function->call(interpreter, call_frame.arguments);
interpreter.pop_call_frame();
if (is_new_expression()) {
if (result.is_object())
return result;
return new_object;
}
return result;
}