[ty] Reduce size of TypeInference (#19435)

Cargo.lock

@@ -2851,7 +2851,6 @@ dependencies = [
  "anstyle",
  "arc-swap",
  "camino",
- "countme",
  "dashmap",
  "dunce",
  "etcetera",

crates/ruff_db/Cargo.toml

@@ -25,7 +25,6 @@ ty_static = { workspace = true }
 anstyle = { workspace = true }
 arc-swap = { workspace = true }
 camino = { workspace = true }
-countme = { workspace = true }
 dashmap = { workspace = true }
 dunce = { workspace = true }
 filetime = { workspace = true }
@@ -59,6 +58,11 @@ tempfile = { workspace = true }
 cache = ["ruff_cache"]
 junit = ["dep:quick-junit"]
 os = ["ignore", "dep:etcetera"]
-serde = ["camino/serde1", "dep:serde", "dep:serde_json", "ruff_diagnostics/serde"]
+serde = [
+    "camino/serde1",
+    "dep:serde",
+    "dep:serde_json",
+    "ruff_diagnostics/serde",
+]
 # Exposes testing utilities.
 testing = ["tracing-subscriber"]

crates/ruff_db/src/files.rs

@@ -1,7 +1,6 @@
 use std::fmt;
 use std::sync::Arc;
 
-use countme::Count;
 use dashmap::mapref::entry::Entry;
 pub use file_root::{FileRoot, FileRootKind};
 pub use path::FilePath;
@@ -312,11 +311,6 @@ pub struct File {
     /// the file has been deleted is to change the status to `Deleted`.
     #[default]
     status: FileStatus,
-
-    /// Counter that counts the number of created file instances and active file instances.
-    /// Only enabled in debug builds.
-    #[default]
-    count: Count<File>,
 }
 
 // The Salsa heap is tracked separately.

crates/ruff_db/src/source.rs

@@ -1,8 +1,6 @@
 use std::ops::Deref;
 use std::sync::Arc;
 
-use countme::Count;
-
 use ruff_notebook::Notebook;
 use ruff_python_ast::PySourceType;
 use ruff_source_file::LineIndex;
@@ -38,11 +36,7 @@ pub fn source_text(db: &dyn Db, file: File) -> SourceText {
     };
 
     SourceText {
-        inner: Arc::new(SourceTextInner {
-            kind,
-            read_error,
-            count: Count::new(),
-        }),
+        inner: Arc::new(SourceTextInner { kind, read_error }),
     }
 }
 
@@ -125,8 +119,6 @@ impl std::fmt::Debug for SourceText {
 
 #[derive(Eq, PartialEq, get_size2::GetSize)]
 struct SourceTextInner {
-    #[get_size(ignore)]
-    count: Count<SourceText>,
     kind: SourceTextKind,
     read_error: Option<SourceTextError>,
 }

crates/ty_python_semantic/src/types.rs

@@ -104,7 +104,10 @@ pub fn check_types(db: &dyn Db, file: File) -> Vec<Diagnostic> {
 
     for scope_id in index.scope_ids() {
         let result = infer_scope_types(db, scope_id);
-        diagnostics.extend(result.diagnostics());
+
+        if let Some(scope_diagnostics) = result.diagnostics() {
+            diagnostics.extend(scope_diagnostics);
+        }
     }
 
     diagnostics.extend_diagnostics(
@@ -116,7 +119,7 @@ pub fn check_types(db: &dyn Db, file: File) -> Vec<Diagnostic> {
 
     check_suppressions(db, file, &mut diagnostics);
 
-    diagnostics.into_vec()
+    diagnostics.into_diagnostics()
 }
 
 /// Infer the type of a binding.

crates/ty_python_semantic/src/types/context.rs

@@ -32,7 +32,7 @@ use crate::{
 /// ## Consuming
 /// It's important that the context is explicitly consumed before dropping by calling
 /// [`InferContext::finish`] and the returned diagnostics must be stored
-/// on the current [`TypeInference`](super::infer::TypeInference) result.
+/// on the current [`TypeInferenceBuilder`](super::infer::TypeInferenceBuilder) result.
 pub(crate) struct InferContext<'db, 'ast> {
     db: &'db dyn Db,
     scope: ScopeId<'db>,

crates/ty_python_semantic/src/types/diagnostic.rs

@@ -1671,18 +1671,26 @@ impl TypeCheckDiagnostics {
         self.diagnostics.shrink_to_fit();
     }
 
-    pub(crate) fn into_vec(self) -> Vec<Diagnostic> {
+    pub(crate) fn into_diagnostics(self) -> Vec<Diagnostic> {
         self.diagnostics
     }
 
+    pub(crate) fn is_empty(&self) -> bool {
+        self.diagnostics.is_empty() && self.used_suppressions.is_empty()
+    }
+
     pub fn iter(&self) -> std::slice::Iter<'_, Diagnostic> {
-        self.diagnostics.iter()
+        self.diagnostics().iter()
+    }
+
+    fn diagnostics(&self) -> &[Diagnostic] {
+        self.diagnostics.as_slice()
     }
 }
 
 impl std::fmt::Debug for TypeCheckDiagnostics {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        self.diagnostics.fmt(f)
+        self.diagnostics().fmt(f)
     }
 }
 
@@ -1691,7 +1699,7 @@ impl IntoIterator for TypeCheckDiagnostics {
     type IntoIter = std::vec::IntoIter<Diagnostic>;
 
     fn into_iter(self) -> Self::IntoIter {
-        self.diagnostics.into_iter()
+        self.into_diagnostics().into_iter()
     }
 }
 
@@ -1699,8 +1707,9 @@ impl<'a> IntoIterator for &'a TypeCheckDiagnostics {
     type Item = &'a Diagnostic;
     type IntoIter = std::slice::Iter<'a, Diagnostic>;
 
+    #[inline]
     fn into_iter(self) -> Self::IntoIter {
-        self.diagnostics.iter()
+        self.iter()
     }
 }