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Fix unsoundness in query component access (#1929)

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Pretty much does what it says in the title lol
This commit is contained in:
Boxy 2021-04-15 20:17:59 +00:00
parent 9b7ed18f72
commit 9657f58f6a
3 changed files with 19 additions and 0 deletions
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7
crates/bevy_ecs/src/lib.rs
View file

@ -1071,6 +1071,13 @@ mod tests {
world.query::<(&A, &mut A)>();
}
#[test]
#[should_panic]
fn mut_and_ref_query_panic() {
let mut world = World::new();
world.query::<(&mut A, &A)>();
}
#[test]
#[should_panic]
fn mut_and_mut_query_panic() {

8
crates/bevy_ecs/src/query/fetch.rs
View file

@ -206,6 +206,10 @@ unsafe impl<T: Component> FetchState for ReadState<T> {
}
fn update_component_access(&self, access: &mut FilteredAccess<ComponentId>) {
if access.access().has_write(self.component_id) {
panic!("&{} conflicts with a previous access in this query. Shared access cannot coincide with exclusive access.",
std::any::type_name::<T>());
}
access.add_read(self.component_id)
}
@ -656,6 +660,10 @@ unsafe impl<T: Component> FetchState for ChangeTrackersState<T> {
}
fn update_component_access(&self, access: &mut FilteredAccess<ComponentId>) {
if access.access().has_write(self.component_id) {
panic!("ChangeTrackers<{}> conflicts with a previous access in this query. Shared access cannot coincide with exclusive access.",
std::any::type_name::<T>());
}
access.add_read(self.component_id)
}

4
crates/bevy_ecs/src/query/filter.rs
View file

@ -501,6 +501,10 @@ macro_rules! impl_tick_filter {
#[inline]
fn update_component_access(&self, access: &mut FilteredAccess<ComponentId>) {
if access.access().has_write(self.component_id) {
panic!("$state_name<{}> conflicts with a previous access in this query. Shared access cannot coincide with exclusive access.",
std::any::type_name::<T>());
}
access.add_read(self.component_id);
}