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chore(core): simplify extension config codegen (#18263)

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Avoid creating an extra closure when no config needed. I eventually want
to make OpStateFn fixed sized to avoid boxing it.
This commit is contained in:
Divy Srivastava 2023-03-18 17:02:11 +05:30 committed by GitHub
parent 058865c9a3
commit 9bfa8dc90c
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 48 deletions
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65
core/extensions.rs
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@ -211,13 +211,12 @@ macro_rules! extension {
fn with_ops $( < $( $param : $type + 'static ),+ > )?(ext: &mut $crate::ExtensionBuilder) {
// If individual ops are specified, roll them up into a vector and apply them
$(
let v = vec![
$(
$( #[ $m ] )*
$( $op )::+ :: decl $( :: <$op_param> )? ()
),+
];
ext.ops(v);
ext.ops(vec![
$(
$( #[ $m ] )*
$( $op )::+ :: decl $( :: <$op_param> )? ()
),+
]);
)?
// Otherwise use the ops_fn, if provided
@ -228,14 +227,7 @@ macro_rules! extension {
#[inline(always)]
#[allow(unused_variables)]
fn with_state_and_middleware$( < $( $param : $type + 'static ),+ > )?(ext: &mut $crate::ExtensionBuilder, $( $( $options_id : $options_type ),* )? ) {
#[allow(unused_variables)]
let config = $crate::extension!(! __config__ $( parameters = [ $( $param : $type ),* ] )? $( config = { $( $options_id : $options_type ),* } )? );
$(
ext.state(move |state: &mut $crate::OpState| {
config.call_callback(state, $state_fn)
});
)?
$crate::extension!(! __config__ ext $( parameters = [ $( $param : $type ),* ] )? $( config = { $( $options_id : $options_type ),* } )? $( state_fn = $state_fn )? );
$(
ext.event_loop_middleware($event_loop_middleware_fn);
@ -285,50 +277,27 @@ macro_rules! extension {
};
// This branch of the macro generates a config object that calls the state function with itself.
(! __config__ $( parameters = [ $( $param:ident : $type:ident ),+ ] )? config = { $( $options_id:ident : $options_type:ty ),* } ) => {
(! __config__ $ext:ident $( parameters = [ $( $param:ident : $type:ident ),+ ] )? config = { $( $options_id:ident : $options_type:ty ),* } $( state_fn = $state_fn:expr )? ) => {
{
#[doc(hidden)]
struct Config $( < $( $param : $type + 'static ),+ > )? {
$( pub $options_id : $options_type , )*
$( __phantom_data: ::std::marker::PhantomData<($( $param ),+)>, )?
}
impl $( < $( $param : $type + 'static ),+ > )? Config $( < $( $param ),+ > )? {
/// Call a function of |state, cfg| using this configuration structure.
#[allow(dead_code)]
#[doc(hidden)]
#[inline(always)]
fn call_callback<F: Fn(&mut $crate::OpState, Self)>(self, state: &mut $crate::OpState, f: F) {
f(state, self)
}
}
Config {
let config = Config {
$( $options_id , )*
$( __phantom_data: ::std::marker::PhantomData::<($( $param ),+)>::default() )?
}
};
let state_fn: fn(&mut $crate::OpState, Config $( < $( $param ),+ > )? ) = $( $state_fn )?;
$ext.state(move |state: &mut $crate::OpState| {
state_fn(state, config);
});
}
};
// This branch of the macro generates an empty config object that doesn't actually make any callbacks on the state function.
(! __config__ $( parameters = [ $( $param:ident : $type:ident ),+ ] )? ) => {
{
#[doc(hidden)]
struct Config {
}
impl Config {
/// Call a function of |state| using the fields of this configuration structure.
#[allow(dead_code)]
#[doc(hidden)]
#[inline(always)]
fn call_callback<F: Fn(&mut $crate::OpState)>(self, state: &mut $crate::OpState, f: F) {
f(state)
}
}
Config {}
}
(! __config__ $ext:ident $( parameters = [ $( $param:ident : $type:ident ),+ ] )? $( state_fn = $state_fn:expr )? ) => {
$( $ext.state($state_fn); )?
};
(! __ops__ $ext:ident __eot__) => {