1 use crate::ty::context::TyCtxt;
2 use measureme::{StringComponent, StringId};
3 use rustc_data_structures::fx::FxHashMap;
4 use rustc_data_structures::profiling::SelfProfiler;
5 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
6 use rustc_hir::definitions::DefPathData;
7 use rustc_query_system::query::QueryCache;
8 use rustc_query_system::query::QueryState;
12 pub struct QueryKeyStringCache {
13 def_id_cache: FxHashMap<DefId, StringId>,
16 impl QueryKeyStringCache {
17 pub fn new() -> QueryKeyStringCache {
18 QueryKeyStringCache { def_id_cache: Default::default() }
22 pub struct QueryKeyStringBuilder<'p, 'c, 'tcx> {
23 profiler: &'p SelfProfiler,
25 string_cache: &'c mut QueryKeyStringCache,
28 impl<'p, 'c, 'tcx> QueryKeyStringBuilder<'p, 'c, 'tcx> {
30 profiler: &'p SelfProfiler,
32 string_cache: &'c mut QueryKeyStringCache,
33 ) -> QueryKeyStringBuilder<'p, 'c, 'tcx> {
34 QueryKeyStringBuilder { profiler, tcx, string_cache }
37 // The current implementation is rather crude. In the future it might be a
38 // good idea to base this on `ty::print` in order to get nicer and more
39 // efficient query keys.
40 fn def_id_to_string_id(&mut self, def_id: DefId) -> StringId {
41 if let Some(&string_id) = self.string_cache.def_id_cache.get(&def_id) {
45 let def_key = self.tcx.def_key(def_id);
47 let (parent_string_id, start_index) = match def_key.parent {
48 Some(parent_index) => {
49 let parent_def_id = DefId { index: parent_index, krate: def_id.krate };
51 (self.def_id_to_string_id(parent_def_id), 0)
53 None => (StringId::INVALID, 2),
56 let dis_buffer = &mut [0u8; 16];
61 match def_key.disambiguated_data.data {
62 DefPathData::CrateRoot => {
63 name = self.tcx.original_crate_name(def_id.krate);
68 name = other.as_symbol();
69 if def_key.disambiguated_data.disambiguator == 0 {
73 write!(&mut dis_buffer[..], "[{}]", def_key.disambiguated_data.disambiguator)
75 let end_of_dis = dis_buffer.iter().position(|&c| c == b']').unwrap();
76 dis = std::str::from_utf8(&dis_buffer[..end_of_dis + 1]).unwrap();
82 let name = &*name.as_str();
84 StringComponent::Ref(parent_string_id),
85 StringComponent::Value("::"),
86 StringComponent::Value(name),
87 StringComponent::Value(dis),
90 let string_id = self.profiler.alloc_string(&components[start_index..end_index]);
92 self.string_cache.def_id_cache.insert(def_id, string_id);
98 pub trait IntoSelfProfilingString {
99 fn to_self_profile_string(&self, builder: &mut QueryKeyStringBuilder<'_, '_, '_>) -> StringId;
102 // The default implementation of `IntoSelfProfilingString` just uses `Debug`
103 // which is slow and causes lots of duplication of string data.
104 // The specialized impls below take care of making the `DefId` case more
106 impl<T: Debug> IntoSelfProfilingString for T {
107 default fn to_self_profile_string(
109 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
111 let s = format!("{:?}", self);
112 builder.profiler.alloc_string(&s[..])
116 impl<T: SpecIntoSelfProfilingString> IntoSelfProfilingString for T {
117 fn to_self_profile_string(&self, builder: &mut QueryKeyStringBuilder<'_, '_, '_>) -> StringId {
118 self.spec_to_self_profile_string(builder)
122 #[rustc_specialization_trait]
123 pub trait SpecIntoSelfProfilingString: Debug {
124 fn spec_to_self_profile_string(
126 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
130 impl SpecIntoSelfProfilingString for DefId {
131 fn spec_to_self_profile_string(
133 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
135 builder.def_id_to_string_id(*self)
139 impl SpecIntoSelfProfilingString for CrateNum {
140 fn spec_to_self_profile_string(
142 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
144 builder.def_id_to_string_id(DefId { krate: *self, index: CRATE_DEF_INDEX })
148 impl SpecIntoSelfProfilingString for DefIndex {
149 fn spec_to_self_profile_string(
151 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
153 builder.def_id_to_string_id(DefId { krate: LOCAL_CRATE, index: *self })
157 impl<T0, T1> SpecIntoSelfProfilingString for (T0, T1)
159 T0: SpecIntoSelfProfilingString,
160 T1: SpecIntoSelfProfilingString,
162 fn spec_to_self_profile_string(
164 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
166 let val0 = self.0.to_self_profile_string(builder);
167 let val1 = self.1.to_self_profile_string(builder);
170 StringComponent::Value("("),
171 StringComponent::Ref(val0),
172 StringComponent::Value(","),
173 StringComponent::Ref(val1),
174 StringComponent::Value(")"),
177 builder.profiler.alloc_string(components)
181 /// Allocate the self-profiling query strings for a single query cache. This
182 /// method is called from `alloc_self_profile_query_strings` which knows all
183 /// the queries via macro magic.
184 pub(super) fn alloc_self_profile_query_strings_for_query_cache<'tcx, C>(
186 query_name: &'static str,
187 query_state: &QueryState<TyCtxt<'tcx>, C>,
188 string_cache: &mut QueryKeyStringCache,
191 C::Key: Debug + Clone,
193 tcx.prof.with_profiler(|profiler| {
194 let event_id_builder = profiler.event_id_builder();
196 // Walk the entire query cache and allocate the appropriate
197 // string representations. Each cache entry is uniquely
198 // identified by its dep_node_index.
199 if profiler.query_key_recording_enabled() {
200 let mut query_string_builder = QueryKeyStringBuilder::new(profiler, tcx, string_cache);
202 let query_name = profiler.get_or_alloc_cached_string(query_name);
204 // Since building the string representation of query keys might
205 // need to invoke queries itself, we cannot keep the query caches
206 // locked while doing so. Instead we copy out the
207 // `(query_key, dep_node_index)` pairs and release the lock again.
208 let query_keys_and_indices: Vec<_> = query_state
209 .iter_results(|results| results.map(|(k, _, i)| (k.clone(), i)).collect());
211 // Now actually allocate the strings. If allocating the strings
212 // generates new entries in the query cache, we'll miss them but
213 // we don't actually care.
214 for (query_key, dep_node_index) in query_keys_and_indices {
215 // Translate the DepNodeIndex into a QueryInvocationId
216 let query_invocation_id = dep_node_index.into();
218 // Create the string version of the query-key
219 let query_key = query_key.to_self_profile_string(&mut query_string_builder);
220 let event_id = event_id_builder.from_label_and_arg(query_name, query_key);
222 // Doing this in bulk might be a good idea:
223 profiler.map_query_invocation_id_to_string(
225 event_id.to_string_id(),
229 // In this branch we don't allocate query keys
230 let query_name = profiler.get_or_alloc_cached_string(query_name);
231 let event_id = event_id_builder.from_label(query_name).to_string_id();
233 query_state.iter_results(|results| {
234 let query_invocation_ids: Vec<_> = results.map(|v| v.2.into()).collect();
236 profiler.bulk_map_query_invocation_id_to_single_string(
237 query_invocation_ids.into_iter(),