Auto merge of #119409 - Kobzol:rustc-codegen-ssa-query-instability, r=Nilstrieb

rustc_codegen_ssa: Enforce `rustc::potential_query_instability` lint

Part of #84447.

Author: bors

compiler/rustc_codegen_ssa/src/assert_module_sources.rs

@@ -267,9 +267,12 @@ impl CguReuseTracker {
 
     fn check_expected_reuse(&self, sess: &Session) {
         if let Some(ref data) = self.data {
-            for (cgu_name, &(ref cgu_user_name, ref error_span, expected_reuse, comparison_kind)) in
-                &data.expected_reuse
-            {
+            let mut keys = data.expected_reuse.keys().collect::<Vec<_>>();
+            keys.sort_unstable();
+            for cgu_name in keys {
+                let &(ref cgu_user_name, ref error_span, expected_reuse, comparison_kind) =
+                    data.expected_reuse.get(cgu_name).unwrap();
+
                 if let Some(&actual_reuse) = data.actual_reuse.get(cgu_name) {
                     let (error, at_least) = match comparison_kind {
                         ComparisonKind::Exact => (expected_reuse != actual_reuse, false),

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -554,6 +554,11 @@ fn link_staticlib<'a>(
             archive_builder_builder
                 .extract_bundled_libs(path, tempdir.as_ref(), &relevant_libs)
                 .unwrap_or_else(|e| sess.dcx().emit_fatal(e));
+
+            // We sort the libraries below
+            #[allow(rustc::potential_query_instability)]
+            let mut relevant_libs: Vec<Symbol> = relevant_libs.into_iter().collect();
+            relevant_libs.sort_unstable();
             for filename in relevant_libs {
                 let joined = tempdir.as_ref().join(filename.as_str());
                 let path = joined.as_path();
@@ -2201,14 +2206,19 @@ fn linker_with_args<'a>(
         .iter()
         .find(|(ty, _)| *ty == crate_type)
         .expect("failed to find crate type in dependency format list");
-    let native_libraries_from_nonstatics = codegen_results
+
+    // We sort the libraries below
+    #[allow(rustc::potential_query_instability)]
+    let mut native_libraries_from_nonstatics = codegen_results
         .crate_info
         .native_libraries
         .iter()
         .filter_map(|(cnum, libraries)| {
             (dependency_linkage[cnum.as_usize() - 1] != Linkage::Static).then_some(libraries)
         })
-        .flatten();
+        .flatten()
+        .collect::<Vec<_>>();
+    native_libraries_from_nonstatics.sort_unstable_by(|a, b| a.name.as_str().cmp(b.name.as_str()));
     for (raw_dylib_name, raw_dylib_imports) in
         collate_raw_dylibs(sess, native_libraries_from_nonstatics)?
     {

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -319,6 +319,8 @@ fn exported_symbols_provider_local(
 
         let (_, cgus) = tcx.collect_and_partition_mono_items(());
 
+        // The symbols created in this loop are sorted below it
+        #[allow(rustc::potential_query_instability)]
         for (mono_item, data) in cgus.iter().flat_map(|cgu| cgu.items().iter()) {
             if data.linkage != Linkage::External {
                 // We can only re-use things with external linkage, otherwise

compiler/rustc_codegen_ssa/src/base.rs

@@ -912,17 +912,22 @@ impl CrateInfo {
                 })
                 .collect();
             let prefix = if target.is_like_windows && target.arch == "x86" { "_" } else { "" };
+
+            // This loop only adds new items to values of the hash map, so the order in which we
+            // iterate over the values is not important.
+            #[allow(rustc::potential_query_instability)]
             info.linked_symbols
                 .iter_mut()
                 .filter(|(crate_type, _)| {
                     !matches!(crate_type, CrateType::Rlib | CrateType::Staticlib)
                 })
                 .for_each(|(_, linked_symbols)| {
-                    linked_symbols.extend(
-                        missing_weak_lang_items
-                            .iter()
-                            .map(|item| (format!("{prefix}{item}"), SymbolExportKind::Text)),
-                    );
+                    let mut symbols = missing_weak_lang_items
+                        .iter()
+                        .map(|item| (format!("{prefix}{item}"), SymbolExportKind::Text))
+                        .collect::<Vec<_>>();
+                    symbols.sort_unstable_by(|a, b| a.0.cmp(&b.0));
+                    linked_symbols.extend(symbols);
                     if tcx.allocator_kind(()).is_some() {
                         // At least one crate needs a global allocator. This crate may be placed
                         // after the crate that defines it in the linker order, in which case some

compiler/rustc_codegen_ssa/src/lib.rs

@@ -11,7 +11,6 @@
 #![feature(strict_provenance)]
 #![feature(try_blocks)]
 #![recursion_limit = "256"]
-#![allow(rustc::potential_query_instability)]
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
 //! The backend-agnostic functions of this crate use functions defined in various traits that