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LibJS: Rework how native functions are called to improve |this| value

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Native functions now only get the Interpreter& as an argument. They can
then extract |this| along with any indexed arguments it wants from it.

This forces functions that want |this| to actually deal with calling
interpreter.this_value().to_object(), and dealing with the possibility
of a non-object |this|.

This is still not great but let's keep massaging it forward.
This commit is contained in:
Andreas Kling 2020-03-28 22:48:35 +01:00
parent c209ea1985
commit 7c4e53f31e
25 changed files with 145 additions and 102 deletions
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18
Libraries/LibWeb/DOM/Document.cpp
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@ -338,14 +338,16 @@ JS::Interpreter& Document::interpreter()
if (!m_interpreter) {
m_interpreter = make<JS::Interpreter>();
m_interpreter->global_object().put_native_function("alert", [](JS::Object*, const Vector<JS::Value>& arguments) -> JS::Value {
m_interpreter->global_object().put_native_function("alert", [](JS::Interpreter& interpreter) -> JS::Value {
auto& arguments = interpreter.call_frame().arguments;
if (arguments.size() < 1)
return JS::js_undefined();
GUI::MessageBox::show(arguments[0].to_string(), "Alert", GUI::MessageBox::Type::Information);
return JS::js_undefined();
});
m_interpreter->global_object().put_native_function("setInterval", [this](JS::Object*, const Vector<JS::Value>& arguments) -> JS::Value {
m_interpreter->global_object().put_native_function("setInterval", [this](JS::Interpreter& interpreter) -> JS::Value {
auto& arguments = interpreter.call_frame().arguments;
if (arguments.size() < 2)
return JS::js_undefined();
ASSERT(arguments[0].is_object());
@ -355,14 +357,16 @@ JS::Interpreter& Document::interpreter()
// FIXME: This timer should not be leaked! It should also be removable with clearInterval()!
(void)Core::Timer::construct(
arguments[1].to_i32(), [this, callback] {
const_cast<JS::Function*>(static_cast<const JS::Function*>(callback.cell()))->call(*m_interpreter, {});
// FIXME: Perform the call through Interpreter so it can set up a call frame!
const_cast<JS::Function*>(static_cast<const JS::Function*>(callback.cell()))->call(*m_interpreter);
})
.leak_ref();
return JS::js_undefined();
});
m_interpreter->global_object().put_native_function("requestAnimationFrame", [this](JS::Object*, const Vector<JS::Value>& arguments) -> JS::Value {
m_interpreter->global_object().put_native_function("requestAnimationFrame", [this](JS::Interpreter& interpreter) -> JS::Value {
auto& arguments = interpreter.call_frame().arguments;
if (arguments.size() < 1)
return JS::js_undefined();
ASSERT(arguments[0].is_object());
@ -370,13 +374,15 @@ JS::Interpreter& Document::interpreter()
auto callback = make_handle(const_cast<JS::Object*>(arguments[0].as_object()));
// FIXME: Don't hand out raw DisplayLink ID's to JavaScript!
i32 link_id = GUI::DisplayLink::register_callback([this, callback](i32 link_id) {
const_cast<JS::Function*>(static_cast<const JS::Function*>(callback.cell()))->call(*m_interpreter, {});
// FIXME: Perform the call through Interpreter so it can set up a call frame!
const_cast<JS::Function*>(static_cast<const JS::Function*>(callback.cell()))->call(*m_interpreter);
GUI::DisplayLink::unregister_callback(link_id);
});
return JS::Value(link_id);
});
m_interpreter->global_object().put_native_function("cancelAnimationFrame", [](JS::Object*, const Vector<JS::Value>& arguments) -> JS::Value {
m_interpreter->global_object().put_native_function("cancelAnimationFrame", [](JS::Interpreter& interpreter) -> JS::Value {
auto& arguments = interpreter.call_frame().arguments;
if (arguments.size() < 1)
return JS::js_undefined();
// FIXME: We should not be passing untrusted numbers to DisplayLink::unregistered_callback()!