[red-knot] Add tracing to Salsa queries (#11949)

crates/red_knot_python_semantic/src/module/resolver.rs

@@ -1,3 +1,4 @@
+use salsa::DebugWithDb;
 use std::ops::Deref;
 use std::sync::Arc;
 
@@ -29,7 +30,6 @@ pub fn set_module_resolution_settings(db: &mut dyn Db, config: ModuleResolutionS
 }
 
 /// Resolves a module name to a module.
-#[tracing::instrument(level = "debug", skip(db))]
 pub fn resolve_module(db: &dyn Db, module_name: ModuleName) -> Option<Module> {
     let interned_name = internal::ModuleNameIngredient::new(db, module_name);
 
@@ -45,6 +45,8 @@ pub(crate) fn resolve_module_query(
     db: &dyn Db,
     module_name: internal::ModuleNameIngredient,
 ) -> Option<Module> {
+    let _ = tracing::trace_span!("resolve_module", module_name = ?module_name.debug(db)).enter();
+
     let name = module_name.name(db);
 
     let (search_path, module_file, kind) = resolve_name(db, name)?;
@@ -82,8 +84,9 @@ pub fn path_to_module(db: &dyn Db, path: &VfsPath) -> Option<Module> {
 ///
 /// Returns `None` if the file is not a module locatable via `sys.path`.
 #[salsa::tracked]
-#[tracing::instrument(level = "debug", skip(db))]
-pub fn file_to_module(db: &dyn Db, file: VfsFile) -> Option<Module> {
+pub(crate) fn file_to_module(db: &dyn Db, file: VfsFile) -> Option<Module> {
+    let _ = tracing::trace_span!("file_to_module", file = ?file.debug(db.upcast())).enter();
+
     let path = file.path(db.upcast());
 
     let search_paths = module_search_paths(db);

crates/red_knot_python_semantic/src/semantic_index.rs

@@ -2,6 +2,7 @@ use std::iter::FusedIterator;
 use std::sync::Arc;
 
 use rustc_hash::FxHashMap;
+use salsa::DebugWithDb;
 
 use ruff_db::parsed::parsed_module;
 use ruff_db::vfs::VfsFile;
@@ -28,6 +29,8 @@ type SymbolMap = hashbrown::HashMap<ScopedSymbolId, (), ()>;
 /// Prefer using [`symbol_table`] when working with symbols from a single scope.
 #[salsa::tracked(return_ref, no_eq)]
 pub(crate) fn semantic_index(db: &dyn Db, file: VfsFile) -> SemanticIndex {
+    let _ = tracing::trace_span!("semantic_index", file = ?file.debug(db.upcast())).enter();
+
     let parsed = parsed_module(db.upcast(), file);
 
     SemanticIndexBuilder::new(parsed).build()
@@ -40,6 +43,7 @@ pub(crate) fn semantic_index(db: &dyn Db, file: VfsFile) -> SemanticIndex {
 /// is unchanged.
 #[salsa::tracked]
 pub(crate) fn symbol_table(db: &dyn Db, scope: ScopeId) -> Arc<SymbolTable> {
+    let _ = tracing::trace_span!("symbol_table", scope = ?scope.debug(db)).enter();
     let index = semantic_index(db, scope.file(db));
 
     index.symbol_table(scope.file_scope_id(db))
@@ -48,6 +52,8 @@ pub(crate) fn symbol_table(db: &dyn Db, scope: ScopeId) -> Arc<SymbolTable> {
 /// Returns the root scope of `file`.
 #[salsa::tracked]
 pub(crate) fn root_scope(db: &dyn Db, file: VfsFile) -> ScopeId {
+    let _ = tracing::trace_span!("root_scope", file = ?file.debug(db.upcast())).enter();
+
     FileScopeId::root().to_scope_id(db, file)
 }
 

crates/red_knot_python_semantic/src/semantic_index/symbol.rs

@@ -8,6 +8,7 @@ use std::ops::Range;
 use bitflags::bitflags;
 use hashbrown::hash_map::RawEntryMut;
 use rustc_hash::FxHasher;
+use salsa::DebugWithDb;
 use smallvec::SmallVec;
 
 use ruff_db::vfs::VfsFile;
@@ -132,6 +133,8 @@ impl ScopedSymbolId {
 /// Returns a mapping from [`FileScopeId`] to globally unique [`ScopeId`].
 #[salsa::tracked(return_ref)]
 pub(crate) fn scopes_map(db: &dyn Db, file: VfsFile) -> ScopesMap {
+    let _ = tracing::trace_span!("scopes_map", file = ?file.debug(db.upcast())).enter();
+
     let index = semantic_index(db, file);
 
     let scopes: IndexVec<_, _> = index
@@ -162,6 +165,8 @@ impl ScopesMap {
 
 #[salsa::tracked(return_ref)]
 pub(crate) fn public_symbols_map(db: &dyn Db, file: VfsFile) -> PublicSymbolsMap {
+    let _ = tracing::trace_span!("public_symbols_map", file = ?file.debug(db.upcast())).enter();
+
     let module_scope = root_scope(db, file);
     let symbols = symbol_table(db, module_scope);
 

crates/red_knot_python_semantic/src/types.rs

@@ -62,7 +62,7 @@ pub(crate) fn expression_ty(db: &dyn Db, file: VfsFile, expression: &ast::Expr)
 /// This being a query ensures that the invalidation short-circuits if the type of this symbol didn't change.
 #[salsa::tracked]
 pub(crate) fn public_symbol_ty(db: &dyn Db, symbol: PublicSymbolId) -> Type {
-    let _ = tracing::debug_span!("public_symbol_ty", symbol = ?symbol.debug(db)).enter();
+    let _ = tracing::trace_span!("public_symbol_ty", symbol = ?symbol.debug(db)).enter();
 
     let file = symbol.file(db);
     let scope = root_scope(db, file);
@@ -80,6 +80,8 @@ pub fn public_symbol_ty_by_name(db: &dyn Db, file: VfsFile, name: &str) -> Optio
 /// Infers all types for `scope`.
 #[salsa::tracked(return_ref)]
 pub(crate) fn infer_types(db: &dyn Db, scope: ScopeId) -> TypeInference {
+    let _ = tracing::trace_span!("infer_types", scope = ?scope.debug(db)).enter();
+
     let file = scope.file(db);
     // Using the index here is fine because the code below depends on the AST anyway.
     // The isolation of the query is by the return inferred types.

crates/ruff_db/src/parsed.rs

@@ -1,3 +1,4 @@
+use salsa::DebugWithDb;
 use std::fmt::Formatter;
 use std::ops::Deref;
 use std::sync::Arc;
@@ -22,6 +23,8 @@ use crate::Db;
 /// for determining if a query result is unchanged.
 #[salsa::tracked(return_ref, no_eq)]
 pub fn parsed_module(db: &dyn Db, file: VfsFile) -> ParsedModule {
+    let _ = tracing::trace_span!("parse_module", file = ?file.debug(db)).enter();
+
     let source = source_text(db, file);
     let path = file.path(db);
 

crates/ruff_db/src/source.rs

@@ -1,3 +1,4 @@
+use salsa::DebugWithDb;
 use std::ops::Deref;
 use std::sync::Arc;
 
@@ -9,6 +10,8 @@ use crate::Db;
 /// Reads the content of file.
 #[salsa::tracked]
 pub fn source_text(db: &dyn Db, file: VfsFile) -> SourceText {
+    let _ = tracing::trace_span!("source_text", file = ?file.debug(db)).enter();
+
     let content = file.read(db);
 
     SourceText {
@@ -19,6 +22,8 @@ pub fn source_text(db: &dyn Db, file: VfsFile) -> SourceText {
 /// Computes the [`LineIndex`] for `file`.
 #[salsa::tracked]
 pub fn line_index(db: &dyn Db, file: VfsFile) -> LineIndex {
+    let _ = tracing::trace_span!("line_index", file = ?file.debug(db)).enter();
+
     let source = source_text(db, file);
 
     LineIndex::from_source_text(&source)