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add a (unused) report_query_read to runtime to track deps

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This commit is contained in:
Niko Matsakis 2018-09-29 07:23:45 -04:00
parent 5ed8cafe04
commit 738e285c5c
1 changed files with 25 additions and 1 deletions
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26
src/runtime.rs
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@ -82,6 +82,23 @@ where
value
}
/// Reports that the currently active query read the result from
/// another query.
///
/// # Parameters
///
/// - `descriptor`: the query whose result was read
/// - `changed_revision`: the last revision in which the result of that
/// query had changed
crate fn report_query_read(&self, descriptor: QC::QueryDescriptor, changed_revision: Revision) {
self.local_state
.borrow_mut()
.query_stack
.last_mut()
.unwrap()
.add_read(descriptor, changed_revision);
}
/// Obviously, this should be user configurable at some point.
crate fn report_unexpected_cycle(&self, descriptor: QC::QueryDescriptor) -> ! {
let local_state = self.local_state.borrow();
@ -107,7 +124,8 @@ struct SharedState<QC: QueryContext> {
revision: AtomicU64,
}
/// State that will be specific to a single execution threads (when we support multiple threads)
/// State that will be specific to a single execution threads (when we
/// support multiple threads)
struct LocalState<QC: QueryContext> {
query_stack: Vec<ActiveQuery<QC>>,
}
@ -133,6 +151,12 @@ impl<QC: QueryContext> ActiveQuery<QC> {
subqueries: FxIndexSet::default(),
}
}
fn add_read(&mut self, subquery: QC::QueryDescriptor, changed_revision: Revision) {
if self.subqueries.insert(subquery) {
self.max_revision_read = self.max_revision_read.max(changed_revision);
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]