Update salsa

Cargo.lock

@@ -2033,9 +2033,9 @@ checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
 
 [[package]]
 name = "salsa"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1be22155f8d9732518b2db2bf379fe6f0b2375e76b08b7c8fe6c1b887d548c24"
+checksum = "4deeb38b4c80ac90a8d4796f83da941b0d76c23783550d15d37eb43ccddcb5bc"
 dependencies = [
  "boxcar",
  "crossbeam-queue",
@@ -2056,15 +2056,15 @@ dependencies = [
 
 [[package]]
 name = "salsa-macro-rules"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f55a7ef0a84e336f7c5f0332d81727f5629fe042d2aa556c75307afebc9f78a5"
+checksum = "a4e6166fa2802d86a77dbcae1bfe75f0ac46fdf952660c233ed64855a53dd603"
 
 [[package]]
 name = "salsa-macros"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d0e88a9c0c0d231a63f83dcd1a2c5e5d11044fac4b65bc9ad3b68ab48b0a0ab"
+checksum = "bf358e645a835d9901ee4d812d9812266e046ee92a28d2e37a73b7169a6503b7"
 dependencies = [
  "heck",
  "proc-macro2",

Cargo.toml

@@ -131,7 +131,7 @@ process-wrap = { version = "8.2.0", features = ["std"] }
 pulldown-cmark-to-cmark = "10.0.4"
 pulldown-cmark = { version = "0.9.6", default-features = false }
 rayon = "1.10.0"
-salsa = "0.20.0"
+salsa = "0.21.0"
 semver = "1.0.26"
 serde = { version = "1.0.219" }
 serde_derive = { version = "1.0.219" }

crates/base-db/src/lib.rs

@@ -3,7 +3,7 @@
 mod change;
 mod input;
 
-use std::hash::BuildHasherDefault;
+use std::{cell::RefCell, hash::BuildHasherDefault, panic, sync::Once};
 
 pub use crate::{
     change::FileChange,
@@ -60,7 +60,7 @@ impl Files {
         match self.files.get(&file_id) {
             Some(text) => *text,
             None => {
-                panic!("Unable to fetch file text for `vfs::FileId`: {:?}; this is a bug", file_id)
+                panic!("Unable to fetch file text for `vfs::FileId`: {file_id:?}; this is a bug")
             }
         }
     }
@@ -101,8 +101,7 @@ impl Files {
         let source_root = match self.source_roots.get(&source_root_id) {
             Some(source_root) => source_root,
             None => panic!(
-                "Unable to fetch `SourceRootInput` with `SourceRootId` ({:?}); this is a bug",
-                source_root_id
+                "Unable to fetch `SourceRootInput` with `SourceRootId` ({source_root_id:?}); this is a bug"
             ),
         };
 
@@ -132,8 +131,7 @@ impl Files {
         let file_source_root = match self.file_source_roots.get(&id) {
             Some(file_source_root) => file_source_root,
             None => panic!(
-                "Unable to get `FileSourceRootInput` with `vfs::FileId` ({:?}); this is a bug",
-                id
+                "Unable to get `FileSourceRootInput` with `vfs::FileId` ({id:?}); this is a bug",
             ),
         };
         *file_source_root
@@ -384,3 +382,51 @@ fn relevant_crates(db: &dyn RootQueryDb, file_id: FileId) -> Arc<[Crate]> {
     let source_root = db.file_source_root(file_id);
     db.source_root_crates(source_root.source_root_id(db))
 }
+
+#[must_use]
+pub struct DbPanicContext {
+    // prevent arbitrary construction
+    _priv: (),
+}
+
+impl Drop for DbPanicContext {
+    fn drop(&mut self) {
+        Self::with_ctx(|ctx| assert!(ctx.pop().is_some()));
+    }
+}
+
+impl DbPanicContext {
+    pub fn enter(frame: String) -> DbPanicContext {
+        #[expect(clippy::print_stderr, reason = "already panicking anyway")]
+        fn set_hook() {
+            let default_hook = panic::take_hook();
+            panic::set_hook(Box::new(move |panic_info| {
+                DbPanicContext::with_ctx(|ctx| {
+                    if !ctx.is_empty() {
+                        eprintln!("Panic context:");
+                        for frame in ctx.iter() {
+                            eprintln!("> {frame}\n");
+                        }
+                    }
+                });
+                if let Some(backtrace) = salsa::Backtrace::capture() {
+                    eprintln!("{backtrace}");
+                }
+                default_hook(panic_info);
+            }));
+        }
+
+        static SET_HOOK: Once = Once::new();
+        SET_HOOK.call_once(set_hook);
+
+        Self::with_ctx(|ctx| ctx.push(frame));
+        DbPanicContext { _priv: () }
+    }
+
+    fn with_ctx(f: impl FnOnce(&mut Vec<String>)) {
+        thread_local! {
+            static CTX: RefCell<Vec<String>> = const { RefCell::new(Vec::new()) };
+        }
+        CTX.with(|ctx| f(&mut ctx.borrow_mut()));
+    }
+}

crates/rust-analyzer/src/cli/rustc_tests.rs

@@ -7,6 +7,7 @@ use std::{cell::RefCell, fs::read_to_string, panic::AssertUnwindSafe, path::Path
 
 use hir::{ChangeWithProcMacros, Crate};
 use ide::{AnalysisHost, DiagnosticCode, DiagnosticsConfig};
+use ide_db::base_db;
 use itertools::Either;
 use paths::Utf8PathBuf;
 use profile::StopWatch;
@@ -310,7 +311,7 @@ impl flags::RustcTests {
                 let tester = AssertUnwindSafe(&mut tester);
                 let p = p.clone();
                 move || {
-                    let _guard = stdx::panic_context::enter(p.display().to_string());
+                    let _guard = base_db::DbPanicContext::enter(p.display().to_string());
                     { tester }.0.test(p);
                 }
             }) {

crates/rust-analyzer/src/diagnostics.rs

@@ -5,7 +5,7 @@ use std::mem;
 
 use cargo_metadata::PackageId;
 use ide::FileId;
-use ide_db::FxHashMap;
+use ide_db::{FxHashMap, base_db::DbPanicContext};
 use itertools::Itertools;
 use rustc_hash::FxHashSet;
 use stdx::iter_eq_by;
@@ -215,7 +215,7 @@ pub(crate) fn fetch_native_diagnostics(
     kind: NativeDiagnosticsFetchKind,
 ) -> Vec<(FileId, Vec<lsp_types::Diagnostic>)> {
     let _p = tracing::info_span!("fetch_native_diagnostics").entered();
-    let _ctx = stdx::panic_context::enter("fetch_native_diagnostics".to_owned());
+    let _ctx = DbPanicContext::enter("fetch_native_diagnostics".to_owned());
 
     // the diagnostics produced may point to different files not requested by the concrete request,
     // put those into here and filter later

crates/rust-analyzer/src/handlers/dispatch.rs

@@ -4,7 +4,10 @@ use std::{
     panic, thread,
 };
 
-use ide_db::base_db::salsa::{self, Cancelled};
+use ide_db::base_db::{
+    DbPanicContext,
+    salsa::{self, Cancelled},
+};
 use lsp_server::{ExtractError, Response, ResponseError};
 use serde::{Serialize, de::DeserializeOwned};
 use stdx::thread::ThreadIntent;
@@ -56,7 +59,7 @@ impl RequestDispatcher<'_> {
             tracing::info_span!("request", method = ?req.method, "request_id" = ?req.id).entered();
         tracing::debug!(?params);
         let result = {
-            let _pctx = stdx::panic_context::enter(panic_context);
+            let _pctx = DbPanicContext::enter(panic_context);
             f(self.global_state, params)
         };
         if let Ok(response) = result_to_response::<R>(req.id, result) {
@@ -86,7 +89,7 @@ impl RequestDispatcher<'_> {
         let global_state_snapshot = self.global_state.snapshot();
 
         let result = panic::catch_unwind(move || {
-            let _pctx = stdx::panic_context::enter(panic_context);
+            let _pctx = DbPanicContext::enter(panic_context);
             f(global_state_snapshot, params)
         });
 
@@ -257,7 +260,7 @@ impl RequestDispatcher<'_> {
         }
         .spawn(intent, move || {
             let result = panic::catch_unwind(move || {
-                let _pctx = stdx::panic_context::enter(panic_context);
+                let _pctx = DbPanicContext::enter(panic_context);
                 f(world, params)
             });
             match thread_result_to_response::<R>(req.id.clone(), result) {
@@ -421,11 +424,8 @@ impl NotificationDispatcher<'_> {
 
         tracing::debug!(?params);
 
-        let _pctx = stdx::panic_context::enter(format!(
-            "\nversion: {}\nnotification: {}",
-            version(),
-            N::METHOD
-        ));
+        let _pctx =
+            DbPanicContext::enter(format!("\nversion: {}\nnotification: {}", version(), N::METHOD));
         if let Err(e) = f(self.global_state, params) {
             tracing::error!(handler = %N::METHOD, error = %e, "notification handler failed");
         }

crates/span/src/hygiene.rs

@@ -94,16 +94,11 @@ const _: () = {
         }
     }
     impl zalsa_struct_::Configuration for SyntaxContext {
+        const LOCATION: salsa::plumbing::Location =
+            salsa::plumbing::Location { file: file!(), line: line!() };
         const DEBUG_NAME: &'static str = "SyntaxContextData";
         type Fields<'a> = SyntaxContextData;
         type Struct<'a> = SyntaxContext;
-        fn struct_from_id<'db>(id: salsa::Id) -> Self::Struct<'db> {
-            SyntaxContext::from_salsa_id(id)
-        }
-        fn deref_struct(s: Self::Struct<'_>) -> salsa::Id {
-            s.as_salsa_id()
-                .expect("`SyntaxContext::deref_structs()` called on a root `SyntaxContext`")
-        }
     }
     impl SyntaxContext {
         pub fn ingredient<Db>(db: &Db) -> &zalsa_struct_::IngredientImpl<Self>

xtask/src/util.rs

@@ -37,7 +37,7 @@ pub(crate) fn detect_target(sh: &Shell) -> String {
         Ok(target) => target,
         _ => match cmd!(sh, "rustc --print=host-tuple").read() {
             Ok(target) => target,
-            Err(e) => panic!("Failed to detect target: {}\nPlease set RA_TARGET explicitly", e),
+            Err(e) => panic!("Failed to detect target: {e}\nPlease set RA_TARGET explicitly"),
         },
     }
 }