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Add a dep kind for use of the anon node with zero dependencies

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This commit is contained in:
John Kåre Alsaker 2025-04-02 07:35:05 +02:00
parent 70dab5a27c
commit 927ad1659a
5 changed files with 21 additions and 5 deletions
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10
compiler/rustc_query_system/src/dep_graph/graph.rs
View file

@ -50,7 +50,7 @@ rustc_index::newtype_index! {
rustc_data_structures::static_assert_size!(Option<DepNodeIndex>, 4);
impl DepNodeIndex {
const SINGLETON_DEPENDENCYLESS_ANON_NODE: DepNodeIndex = DepNodeIndex::ZERO;
const SINGLETON_ZERO_DEPS_ANON_NODE: DepNodeIndex = DepNodeIndex::ZERO;
pub const FOREVER_RED_NODE: DepNodeIndex = DepNodeIndex::from_u32(1);
}
@ -140,13 +140,13 @@ impl<D: Deps> DepGraph<D> {
let colors = DepNodeColorMap::new(prev_graph_node_count);
// Instantiate a dependy-less node only once for anonymous queries.
// Instantiate a node with zero dependencies only once for anonymous queries.
let _green_node_index = current.alloc_node(
DepNode { kind: D::DEP_KIND_NULL, hash: current.anon_id_seed.into() },
DepNode { kind: D::DEP_KIND_ANON_ZERO_DEPS, hash: current.anon_id_seed.into() },
EdgesVec::new(),
Fingerprint::ZERO,
);
assert_eq!(_green_node_index, DepNodeIndex::SINGLETON_DEPENDENCYLESS_ANON_NODE);
assert_eq!(_green_node_index, DepNodeIndex::SINGLETON_ZERO_DEPS_ANON_NODE);
// Instantiate a dependy-less red node only once for anonymous queries.
let red_node_index = current.alloc_node(
@ -407,7 +407,7 @@ impl<D: Deps> DepGraphData<D> {
// going to be (i.e. equal to the precomputed
// `SINGLETON_DEPENDENCYLESS_ANON_NODE`). As a consequence we can skip creating
// a `StableHasher` and sending the node through interning.
DepNodeIndex::SINGLETON_DEPENDENCYLESS_ANON_NODE
DepNodeIndex::SINGLETON_ZERO_DEPS_ANON_NODE
}
1 => {
// When there is only one dependency, don't bother creating a node.

3
compiler/rustc_query_system/src/dep_graph/mod.rs
View file

@ -111,6 +111,9 @@ pub trait Deps {
/// We use this to create a side effect node.
const DEP_KIND_SIDE_EFFECT: DepKind;
/// We use this to create the anon node with zero dependencies.
const DEP_KIND_ANON_ZERO_DEPS: DepKind;
/// This is the highest value a `DepKind` can have. It's used during encoding to
/// pack information into the unused bits.
const DEP_KIND_MAX: u16;