Split DepKindStruct in two.
This commit is contained in:
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1ac21e4571
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@ -55,7 +55,6 @@
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//!
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//! [dependency graph]: https://rustc-dev-guide.rust-lang.org/query.html
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use crate::ty::query::QueryCtxt;
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use crate::ty::TyCtxt;
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use rustc_data_structures::fingerprint::Fingerprint;
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@ -63,7 +62,6 @@ use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_INDEX};
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use rustc_hir::definitions::DefPathHash;
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use rustc_hir::HirId;
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use rustc_span::symbol::Symbol;
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use rustc_span::DUMMY_SP;
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use std::hash::Hash;
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pub use rustc_query_system::dep_graph::{DepContext, DepNodeParams};
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@ -92,53 +90,6 @@ pub struct DepKindStruct {
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// FIXME: Make this a simple boolean once DepNodeParams::can_reconstruct_query_key
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// can be made a specialized associated const.
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can_reconstruct_query_key: fn() -> bool,
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/// The red/green evaluation system will try to mark a specific DepNode in the
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/// dependency graph as green by recursively trying to mark the dependencies of
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/// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
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/// where we don't know if it is red or green and we therefore actually have
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/// to recompute its value in order to find out. Since the only piece of
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/// information that we have at that point is the `DepNode` we are trying to
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/// re-evaluate, we need some way to re-run a query from just that. This is what
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/// `force_from_dep_node()` implements.
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///
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/// In the general case, a `DepNode` consists of a `DepKind` and an opaque
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/// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
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/// is usually constructed by computing a stable hash of the query-key that the
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/// `DepNode` corresponds to. Consequently, it is not in general possible to go
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/// back from hash to query-key (since hash functions are not reversible). For
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/// this reason `force_from_dep_node()` is expected to fail from time to time
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/// because we just cannot find out, from the `DepNode` alone, what the
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/// corresponding query-key is and therefore cannot re-run the query.
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///
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/// The system deals with this case letting `try_mark_green` fail which forces
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/// the root query to be re-evaluated.
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///
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/// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
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/// Fortunately, we can use some contextual information that will allow us to
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/// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
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/// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
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/// valid `DefPathHash`. Since we also always build a huge table that maps every
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/// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
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/// everything we need to re-run the query.
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///
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/// Take the `mir_promoted` query as an example. Like many other queries, it
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/// just has a single parameter: the `DefId` of the item it will compute the
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/// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
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/// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
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/// is actually a `DefPathHash`, and can therefore just look up the corresponding
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/// `DefId` in `tcx.def_path_hash_to_def_id`.
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///
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/// When you implement a new query, it will likely have a corresponding new
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/// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
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/// a rule of thumb, if your query takes a `DefId` or `LocalDefId` as sole parameter,
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/// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
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/// add it to the "We don't have enough information to reconstruct..." group in
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/// the match below.
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pub(crate) force_from_dep_node: fn(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool,
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/// Invoke a query to put the on-disk cached value in memory.
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pub(crate) try_load_from_on_disk_cache: fn(QueryCtxt<'_>, &DepNode),
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}
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impl std::ops::Deref for DepKind {
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@ -197,8 +148,7 @@ macro_rules! contains_eval_always_attr {
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#[allow(non_upper_case_globals)]
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pub mod dep_kind {
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use super::*;
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use crate::ty::query::{queries, query_keys};
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use rustc_query_system::query::{force_query, QueryDescription};
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use crate::ty::query::query_keys;
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// We use this for most things when incr. comp. is turned off.
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pub const Null: DepKindStruct = DepKindStruct {
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@ -207,8 +157,6 @@ pub mod dep_kind {
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is_eval_always: false,
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can_reconstruct_query_key: || true,
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force_from_dep_node: |_, dep_node| bug!("force_from_dep_node: encountered {:?}", dep_node),
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const TraitSelect: DepKindStruct = DepKindStruct {
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@ -217,8 +165,6 @@ pub mod dep_kind {
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is_eval_always: false,
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can_reconstruct_query_key: || true,
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const CompileCodegenUnit: DepKindStruct = DepKindStruct {
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@ -227,8 +173,6 @@ pub mod dep_kind {
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is_eval_always: false,
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can_reconstruct_query_key: || false,
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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macro_rules! define_query_dep_kinds {
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@ -247,54 +191,11 @@ pub mod dep_kind {
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::can_reconstruct_query_key()
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}
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fn recover<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<query_keys::$variant<'tcx>> {
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<query_keys::$variant<'_> as DepNodeParams<TyCtxt<'_>>>::recover(tcx, dep_node)
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}
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fn force_from_dep_node(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool {
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if is_anon {
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return false;
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}
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if !can_reconstruct_query_key() {
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return false;
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}
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if let Some(key) = recover(*tcx, dep_node) {
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force_query::<queries::$variant<'_>, _>(tcx, key, DUMMY_SP, *dep_node);
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return true;
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}
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false
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}
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fn try_load_from_on_disk_cache(tcx: QueryCtxt<'_>, dep_node: &DepNode) {
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if is_anon {
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return
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}
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if !can_reconstruct_query_key() {
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return
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}
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debug_assert!(tcx.dep_graph
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.node_color(dep_node)
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.map(|c| c.is_green())
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.unwrap_or(false));
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let key = recover(*tcx, dep_node).unwrap_or_else(|| panic!("Failed to recover key for {:?} with hash {}", dep_node, dep_node.hash));
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if queries::$variant::cache_on_disk(tcx, &key, None) {
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let _ = tcx.$variant(key);
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}
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}
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DepKindStruct {
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has_params,
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is_anon,
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is_eval_always,
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can_reconstruct_query_key,
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force_from_dep_node,
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try_load_from_on_disk_cache,
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}
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};)*
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);
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@ -310,7 +211,12 @@ macro_rules! define_dep_nodes {
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$variant:ident $(( $tuple_arg_ty:ty $(,)? ))*
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,)*
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) => (
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static DEP_KINDS: &[DepKindStruct] = &[ $(dep_kind::$variant),* ];
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#[macro_export]
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macro_rules! make_dep_kind_array {
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($mod:ident) => {[ $(($mod::$variant),)* ]};
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}
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static DEP_KINDS: &[DepKindStruct] = &make_dep_kind_array!(dep_kind);
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/// This enum serves as an index into the `DEP_KINDS` array.
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
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@ -3,6 +3,7 @@ use crate::ty::{self, TyCtxt};
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use rustc_data_structures::profiling::SelfProfilerRef;
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use rustc_data_structures::sync::Lock;
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#[macro_use]
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mod dep_node;
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pub use rustc_query_system::dep_graph::{
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@ -76,6 +76,7 @@ pub mod query;
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#[macro_use]
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pub mod arena;
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#[macro_use]
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pub mod dep_graph;
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pub mod hir;
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pub mod ich;
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@ -62,6 +62,7 @@ use std::sync::Arc;
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#[macro_use]
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mod plumbing;
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pub use plumbing::QueryCtxt;
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use plumbing::QueryStruct;
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pub(crate) use rustc_query_system::query::CycleError;
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use rustc_query_system::query::*;
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@ -69,7 +69,8 @@ impl QueryContext for QueryCtxt<'tcx> {
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}
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fn try_load_from_on_disk_cache(&self, dep_node: &DepNode) {
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(dep_node.kind.try_load_from_on_disk_cache)(*self, dep_node)
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let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
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(cb.try_load_from_on_disk_cache)(*self, dep_node)
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}
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fn try_force_from_dep_node(&self, dep_node: &DepNode) -> bool {
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@ -126,7 +127,8 @@ impl QueryContext for QueryCtxt<'tcx> {
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"calling force_from_dep_node() on DepKind::codegen_unit"
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);
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(dep_node.kind.force_from_dep_node)(*self, dep_node)
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let cb = &super::QUERY_CALLBACKS[dep_node.kind as usize];
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(cb.force_from_dep_node)(*self, dep_node)
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}
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fn has_errors_or_delayed_span_bugs(&self) -> bool {
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@ -307,6 +309,60 @@ impl<'tcx> Queries<'tcx> {
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}
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}
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/// This struct stores metadata about each Query.
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///
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/// Information is retrieved by indexing the `QUERIES` array using the integer value
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/// of the `DepKind`. Overall, this allows to implement `QueryContext` using this manual
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/// jump table instead of large matches.
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pub struct QueryStruct {
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/// The red/green evaluation system will try to mark a specific DepNode in the
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/// dependency graph as green by recursively trying to mark the dependencies of
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/// that `DepNode` as green. While doing so, it will sometimes encounter a `DepNode`
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/// where we don't know if it is red or green and we therefore actually have
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/// to recompute its value in order to find out. Since the only piece of
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/// information that we have at that point is the `DepNode` we are trying to
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/// re-evaluate, we need some way to re-run a query from just that. This is what
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/// `force_from_dep_node()` implements.
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///
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/// In the general case, a `DepNode` consists of a `DepKind` and an opaque
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/// GUID/fingerprint that will uniquely identify the node. This GUID/fingerprint
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/// is usually constructed by computing a stable hash of the query-key that the
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/// `DepNode` corresponds to. Consequently, it is not in general possible to go
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/// back from hash to query-key (since hash functions are not reversible). For
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/// this reason `force_from_dep_node()` is expected to fail from time to time
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/// because we just cannot find out, from the `DepNode` alone, what the
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/// corresponding query-key is and therefore cannot re-run the query.
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///
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/// The system deals with this case letting `try_mark_green` fail which forces
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/// the root query to be re-evaluated.
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///
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/// Now, if `force_from_dep_node()` would always fail, it would be pretty useless.
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/// Fortunately, we can use some contextual information that will allow us to
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/// reconstruct query-keys for certain kinds of `DepNode`s. In particular, we
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/// enforce by construction that the GUID/fingerprint of certain `DepNode`s is a
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/// valid `DefPathHash`. Since we also always build a huge table that maps every
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/// `DefPathHash` in the current codebase to the corresponding `DefId`, we have
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/// everything we need to re-run the query.
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///
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/// Take the `mir_promoted` query as an example. Like many other queries, it
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/// just has a single parameter: the `DefId` of the item it will compute the
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/// validated MIR for. Now, when we call `force_from_dep_node()` on a `DepNode`
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/// with kind `MirValidated`, we know that the GUID/fingerprint of the `DepNode`
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/// is actually a `DefPathHash`, and can therefore just look up the corresponding
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/// `DefId` in `tcx.def_path_hash_to_def_id`.
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///
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/// When you implement a new query, it will likely have a corresponding new
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/// `DepKind`, and you'll have to support it here in `force_from_dep_node()`. As
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/// a rule of thumb, if your query takes a `DefId` or `LocalDefId` as sole parameter,
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/// then `force_from_dep_node()` should not fail for it. Otherwise, you can just
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/// add it to the "We don't have enough information to reconstruct..." group in
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/// the match below.
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pub(crate) force_from_dep_node: fn(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool,
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/// Invoke a query to put the on-disk cached value in memory.
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pub(crate) try_load_from_on_disk_cache: fn(QueryCtxt<'_>, &DepNode),
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}
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macro_rules! handle_cycle_error {
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([][$tcx: expr, $error:expr]) => {{
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$tcx.report_cycle($error).emit();
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@ -545,6 +601,89 @@ macro_rules! define_queries {
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}
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})*
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#[allow(non_upper_case_globals)]
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pub mod query_callbacks {
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use super::*;
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use crate::dep_graph::DepNode;
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use crate::ty::query::{queries, query_keys};
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use rustc_query_system::dep_graph::DepNodeParams;
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use rustc_query_system::query::{force_query, QueryDescription};
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// We use this for most things when incr. comp. is turned off.
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pub const Null: QueryStruct = QueryStruct {
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force_from_dep_node: |_, dep_node| bug!("force_from_dep_node: encountered {:?}", dep_node),
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const TraitSelect: QueryStruct = QueryStruct {
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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pub const CompileCodegenUnit: QueryStruct = QueryStruct {
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force_from_dep_node: |_, _| false,
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try_load_from_on_disk_cache: |_, _| {},
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};
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$(pub const $name: QueryStruct = {
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const is_anon: bool = is_anon!([$($modifiers)*]);
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#[inline(always)]
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fn can_reconstruct_query_key() -> bool {
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<query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>
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::can_reconstruct_query_key()
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}
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fn recover<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> Option<query_keys::$name<'tcx>> {
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<query_keys::$name<'_> as DepNodeParams<TyCtxt<'_>>>::recover(tcx, dep_node)
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}
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fn force_from_dep_node(tcx: QueryCtxt<'_>, dep_node: &DepNode) -> bool {
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if is_anon {
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return false;
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}
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if !can_reconstruct_query_key() {
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return false;
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}
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if let Some(key) = recover(*tcx, dep_node) {
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force_query::<queries::$name<'_>, _>(tcx, key, DUMMY_SP, *dep_node);
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return true;
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}
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false
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}
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fn try_load_from_on_disk_cache(tcx: QueryCtxt<'_>, dep_node: &DepNode) {
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if is_anon {
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return
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}
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if !can_reconstruct_query_key() {
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return
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}
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debug_assert!(tcx.dep_graph
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.node_color(dep_node)
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.map(|c| c.is_green())
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.unwrap_or(false));
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let key = recover(*tcx, dep_node).unwrap_or_else(|| panic!("Failed to recover key for {:?} with hash {}", dep_node, dep_node.hash));
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if queries::$name::cache_on_disk(tcx, &key, None) {
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let _ = tcx.$name(key);
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}
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}
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QueryStruct {
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force_from_dep_node,
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try_load_from_on_disk_cache,
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}
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};)*
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}
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static QUERY_CALLBACKS: &[QueryStruct] = &make_dep_kind_array!(query_callbacks);
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define_provider_struct! {
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tcx: $tcx,
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input: ($(([$($modifiers)*] [$name] [$($K)*] [$V]))*)
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