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, LocalDefId, LOCAL_CRATE};
6 use rustc_hir::definitions::DefPathData;
7 use rustc_middle::ty::{TyCtxt, WithOptConstParam};
8 use rustc_query_system::query::QueryCache;
12 pub(crate) struct QueryKeyStringCache {
13 def_id_cache: FxHashMap<DefId, StringId>,
16 impl QueryKeyStringCache {
17 fn new() -> QueryKeyStringCache {
18 QueryKeyStringCache { def_id_cache: Default::default() }
22 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];
63 match def_key.disambiguated_data.data {
64 DefPathData::CrateRoot => {
65 crate_name = self.tcx.crate_name(def_id.krate);
66 name = crate_name.as_str();
71 other_name = other.to_string();
72 name = other_name.as_str();
73 if def_key.disambiguated_data.disambiguator == 0 {
77 write!(&mut dis_buffer[..], "[{}]", def_key.disambiguated_data.disambiguator)
79 let end_of_dis = dis_buffer.iter().position(|&c| c == b']').unwrap();
80 dis = std::str::from_utf8(&dis_buffer[..end_of_dis + 1]).unwrap();
87 StringComponent::Ref(parent_string_id),
88 StringComponent::Value("::"),
89 StringComponent::Value(name),
90 StringComponent::Value(dis),
93 let string_id = self.profiler.alloc_string(&components[start_index..end_index]);
95 self.string_cache.def_id_cache.insert(def_id, string_id);
101 trait IntoSelfProfilingString {
102 fn to_self_profile_string(&self, builder: &mut QueryKeyStringBuilder<'_, '_, '_>) -> StringId;
105 // The default implementation of `IntoSelfProfilingString` just uses `Debug`
106 // which is slow and causes lots of duplication of string data.
107 // The specialized impls below take care of making the `DefId` case more
109 impl<T: Debug> IntoSelfProfilingString for T {
110 default fn to_self_profile_string(
112 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
114 let s = format!("{:?}", self);
115 builder.profiler.alloc_string(&s[..])
119 impl<T: SpecIntoSelfProfilingString> IntoSelfProfilingString for T {
120 fn to_self_profile_string(&self, builder: &mut QueryKeyStringBuilder<'_, '_, '_>) -> StringId {
121 self.spec_to_self_profile_string(builder)
125 #[rustc_specialization_trait]
126 trait SpecIntoSelfProfilingString: Debug {
127 fn spec_to_self_profile_string(
129 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
133 impl SpecIntoSelfProfilingString for DefId {
134 fn spec_to_self_profile_string(
136 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
138 builder.def_id_to_string_id(*self)
142 impl SpecIntoSelfProfilingString for CrateNum {
143 fn spec_to_self_profile_string(
145 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
147 builder.def_id_to_string_id(self.as_def_id())
151 impl SpecIntoSelfProfilingString for DefIndex {
152 fn spec_to_self_profile_string(
154 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
156 builder.def_id_to_string_id(DefId { krate: LOCAL_CRATE, index: *self })
160 impl SpecIntoSelfProfilingString for LocalDefId {
161 fn spec_to_self_profile_string(
163 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
165 builder.def_id_to_string_id(DefId { krate: LOCAL_CRATE, index: self.local_def_index })
169 impl<T: SpecIntoSelfProfilingString> SpecIntoSelfProfilingString for WithOptConstParam<T> {
170 fn spec_to_self_profile_string(
172 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
174 // We print `WithOptConstParam` values as tuples to make them shorter
175 // and more readable, without losing information:
177 // "WithOptConstParam { did: foo::bar, const_param_did: Some(foo::baz) }"
178 // becomes "(foo::bar, foo::baz)" and
179 // "WithOptConstParam { did: foo::bar, const_param_did: None }"
180 // becomes "(foo::bar, _)".
182 let did = StringComponent::Ref(self.did.to_self_profile_string(builder));
184 let const_param_did = if let Some(const_param_did) = self.const_param_did {
185 let const_param_did = builder.def_id_to_string_id(const_param_did);
186 StringComponent::Ref(const_param_did)
188 StringComponent::Value("_")
192 StringComponent::Value("("),
194 StringComponent::Value(", "),
196 StringComponent::Value(")"),
199 builder.profiler.alloc_string(&components[..])
203 impl<T0, T1> SpecIntoSelfProfilingString for (T0, T1)
205 T0: SpecIntoSelfProfilingString,
206 T1: SpecIntoSelfProfilingString,
208 fn spec_to_self_profile_string(
210 builder: &mut QueryKeyStringBuilder<'_, '_, '_>,
212 let val0 = self.0.to_self_profile_string(builder);
213 let val1 = self.1.to_self_profile_string(builder);
216 StringComponent::Value("("),
217 StringComponent::Ref(val0),
218 StringComponent::Value(","),
219 StringComponent::Ref(val1),
220 StringComponent::Value(")"),
223 builder.profiler.alloc_string(components)
227 /// Allocate the self-profiling query strings for a single query cache. This
228 /// method is called from `alloc_self_profile_query_strings` which knows all
229 /// the queries via macro magic.
230 pub(crate) fn alloc_self_profile_query_strings_for_query_cache<'tcx, C>(
232 query_name: &'static str,
234 string_cache: &mut QueryKeyStringCache,
237 C::Key: Debug + Clone,
239 tcx.prof.with_profiler(|profiler| {
240 let event_id_builder = profiler.event_id_builder();
242 // Walk the entire query cache and allocate the appropriate
243 // string representations. Each cache entry is uniquely
244 // identified by its dep_node_index.
245 if profiler.query_key_recording_enabled() {
246 let mut query_string_builder = QueryKeyStringBuilder::new(profiler, tcx, string_cache);
248 let query_name = profiler.get_or_alloc_cached_string(query_name);
250 // Since building the string representation of query keys might
251 // need to invoke queries itself, we cannot keep the query caches
252 // locked while doing so. Instead we copy out the
253 // `(query_key, dep_node_index)` pairs and release the lock again.
254 let mut query_keys_and_indices = Vec::new();
255 query_cache.iter(&mut |k, _, i| query_keys_and_indices.push((k.clone(), i)));
257 // Now actually allocate the strings. If allocating the strings
258 // generates new entries in the query cache, we'll miss them but
259 // we don't actually care.
260 for (query_key, dep_node_index) in query_keys_and_indices {
261 // Translate the DepNodeIndex into a QueryInvocationId
262 let query_invocation_id = dep_node_index.into();
264 // Create the string version of the query-key
265 let query_key = query_key.to_self_profile_string(&mut query_string_builder);
266 let event_id = event_id_builder.from_label_and_arg(query_name, query_key);
268 // Doing this in bulk might be a good idea:
269 profiler.map_query_invocation_id_to_string(
271 event_id.to_string_id(),
275 // In this branch we don't allocate query keys
276 let query_name = profiler.get_or_alloc_cached_string(query_name);
277 let event_id = event_id_builder.from_label(query_name).to_string_id();
279 // FIXME(eddyb) make this O(1) by using a pre-cached query name `EventId`,
280 // instead of passing the `DepNodeIndex` to `finish_with_query_invocation_id`,
281 // when recording the event in the first place.
282 let mut query_invocation_ids = Vec::new();
283 query_cache.iter(&mut |_, _, i| {
284 query_invocation_ids.push(i.into());
287 profiler.bulk_map_query_invocation_id_to_single_string(
288 query_invocation_ids.into_iter(),
295 /// All self-profiling events generated by the query engine use
296 /// virtual `StringId`s for their `event_id`. This method makes all
297 /// those virtual `StringId`s point to actual strings.
299 /// If we are recording only summary data, the ids will point to
300 /// just the query names. If we are recording query keys too, we
301 /// allocate the corresponding strings here.
302 pub fn alloc_self_profile_query_strings<'tcx>(tcx: TyCtxt<'tcx>) {
303 if !tcx.prof.enabled() {
307 let mut string_cache = QueryKeyStringCache::new();
308 let queries = QueryCtxt::from_tcx(tcx);
310 for query in &queries.queries.query_structs {
311 (query.alloc_self_profile_query_strings)(tcx, &mut string_cache);