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Attempt to reduce perf impact.

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This commit is contained in:
Camille GILLOT 2021-12-11 10:27:59 +01:00
parent 87644d85a2
commit e33e2d6e9e
1 changed files with 17 additions and 10 deletions
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27
compiler/rustc_query_system/src/dep_graph/graph.rs
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@ -676,28 +676,35 @@ impl<K: DepKind> DepGraph<K> {
None => {}
}
let mut stack =
MarkingStack { stack: vec![prev_index], sess: qcx.dep_context().sess(), graph: data };
let mut stack = smallvec![prev_index];
let _backtrace_print =
MarkingStack { stack: &mut stack, sess: qcx.dep_context().sess(), graph: data };
// This DepNode and the corresponding query invocation existed
// in the previous compilation session too, so we can try to
// mark it as green by recursively marking all of its
// dependencies green.
return self
.try_mark_previous_green(qcx, data, prev_index, &dep_node, &mut stack.stack)
let ret = self
.try_mark_previous_green(qcx, data, prev_index, &dep_node, _backtrace_print.stack)
.map(|dep_node_index| (prev_index, dep_node_index));
// We succeeded, no backtrace.
std::mem::forget(_backtrace_print);
return ret;
/// Remember the stack of queries we are forcing in the event of an incr. comp. panic.
struct MarkingStack<'a, K: DepKind> {
stack: Vec<SerializedDepNodeIndex>,
struct MarkingStack<'a, 'v, K: DepKind> {
stack: &'v mut SmallVec<[SerializedDepNodeIndex; 8]>,
sess: &'a rustc_session::Session,
graph: &'a DepGraphData<K>,
}
impl<'a, K: DepKind> Drop for MarkingStack<'a, K> {
impl<'a, 'v, K: DepKind> Drop for MarkingStack<'a, 'v, K> {
/// Print the forcing backtrace.
#[inline(never)]
#[cold]
fn drop(&mut self) {
for &frame in self.stack.iter().skip(1).rev() {
for &frame in self.stack.iter().rev() {
let node = self.graph.previous.index_to_node(frame);
// Do not try to rely on DepNode's Debug implementation,
// since it may panic.
@ -721,7 +728,7 @@ impl<K: DepKind> DepGraph<K> {
data: &DepGraphData<K>,
parent_dep_node_index: SerializedDepNodeIndex,
dep_node: &DepNode<K>,
stack: &mut Vec<SerializedDepNodeIndex>,
stack: &mut SmallVec<[SerializedDepNodeIndex; 8]>,
) -> Option<()> {
let dep_dep_node_color = data.colors.get(parent_dep_node_index);
let dep_dep_node = &data.previous.index_to_node(parent_dep_node_index);
@ -810,7 +817,7 @@ impl<K: DepKind> DepGraph<K> {
data: &DepGraphData<K>,
prev_dep_node_index: SerializedDepNodeIndex,
dep_node: &DepNode<K>,
stack: &mut Vec<SerializedDepNodeIndex>,
stack: &mut SmallVec<[SerializedDepNodeIndex; 8]>,
) -> Option<DepNodeIndex> {
#[cfg(not(parallel_compiler))]
{