From 90abedee9cd00939b26356166a0049171e43a845 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 26 Feb 2026 11:07:29 +1100
Subject: [PATCH] Remove `ENCODE_QUERY_RESULTS`.

And also `encode_query_results` for each cacheable query. This is done
by generating `encode_all_query_results` and having it do things more
directly.
---
 compiler/rustc_query_impl/src/lib.rs      |  2 +-
 compiler/rustc_query_impl/src/plumbing.rs | 59 +++++++----------------
 2 files changed, 18 insertions(+), 43 deletions(-)

diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index 34800096084c..875dd07ff25f 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -19,7 +19,7 @@
 
 pub use crate::dep_kind_vtables::make_dep_kind_vtables;
 pub use crate::job::{QueryJobMap, break_query_cycles, print_query_stack};
-use crate::plumbing::{encode_all_query_results, try_mark_green};
+use crate::plumbing::try_mark_green;
 use crate::profiling_support::QueryKeyStringCache;
 use crate::values::Value;
 
diff --git a/compiler/rustc_query_impl/src/plumbing.rs b/compiler/rustc_query_impl/src/plumbing.rs
index 1f73277e88ff..92a4b7ff2b65 100644
--- a/compiler/rustc_query_impl/src/plumbing.rs
+++ b/compiler/rustc_query_impl/src/plumbing.rs
@@ -99,16 +99,6 @@ pub(super) fn try_mark_green<'tcx>(tcx: TyCtxt<'tcx>, dep_node: &DepNode) -> boo
     tcx.dep_graph.try_mark_green(tcx, dep_node).is_some()
 }
 
-pub(super) fn encode_all_query_results<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    encoder: &mut CacheEncoder<'_, 'tcx>,
-    query_result_index: &mut EncodedDepNodeIndex,
-) {
-    for encode in super::ENCODE_QUERY_RESULTS.iter().copied().flatten() {
-        encode(tcx, encoder, query_result_index);
-    }
-}
-
 macro_rules! cycle_error_handling {
     ([]) => {{
         rustc_middle::query::CycleErrorHandling::Error
@@ -290,7 +280,7 @@ pub(crate) fn create_deferred_query_stack_frame<'tcx, C>(
     QueryStackFrame::new(info, kind, def_id, def_id_for_ty_in_cycle)
 }
 
-pub(crate) fn encode_query_results_inner<'a, 'tcx, C, V>(
+pub(crate) fn encode_query_results<'a, 'tcx, C, V>(
     tcx: TyCtxt<'tcx>,
     query: &'tcx QueryVTable<'tcx, C>,
     encoder: &mut CacheEncoder<'a, 'tcx>,
@@ -592,21 +582,6 @@ fn query_vtable(tcx: TyCtxt<'tcx>) -> &'tcx QueryVTable<'tcx, Self::Cache> {
                     &tcx.query_system.query_vtables.$name
                 }
             }
-
-            item_if_cache_on_disk! { [$($modifiers)*]
-                pub(crate) fn encode_query_results<'tcx>(
-                    tcx: TyCtxt<'tcx>,
-                    encoder: &mut CacheEncoder<'_, 'tcx>,
-                    query_result_index: &mut EncodedDepNodeIndex
-                ) {
-                    $crate::plumbing::encode_query_results_inner(
-                        tcx,
-                        &tcx.query_system.query_vtables.$name,
-                        encoder,
-                        query_result_index,
-                    )
-                }
-            }
         })*}
 
         pub fn make_query_vtables<'tcx>(incremental: bool) -> queries::QueryVTables<'tcx> {
@@ -617,8 +592,6 @@ pub fn make_query_vtables<'tcx>(incremental: bool) -> queries::QueryVTables<'tcx
             }
         }
 
-        // These arrays are used for iteration and can't be indexed by `DepKind`.
-
         /// Returns a map of currently active query jobs, collected from all queries.
         ///
         /// If `require_complete` is `true`, this function locks all shards of the
@@ -679,21 +652,23 @@ pub fn alloc_self_profile_query_strings(tcx: TyCtxt<'_>) {
             tcx.sess.prof.store_query_cache_hits();
         }
 
-        const ENCODE_QUERY_RESULTS: &[
-            Option<for<'tcx> fn(
-                TyCtxt<'tcx>,
-                &mut CacheEncoder<'_, 'tcx>,
-                &mut EncodedDepNodeIndex)
-            >
-        ] = &[
+        fn encode_all_query_results<'tcx>(
+            tcx: TyCtxt<'tcx>,
+            encoder: &mut CacheEncoder<'_, 'tcx>,
+            query_result_index: &mut EncodedDepNodeIndex,
+        ) {
             $(
-                if_cache_on_disk!([$($modifiers)*] {
-                    Some(query_impl::$name::encode_query_results)
-                } {
-                    None
-                })
-            ),*
-        ];
+                item_if_cache_on_disk! {
+                    [$($modifiers)*]
+                    $crate::plumbing::encode_query_results(
+                        tcx,
+                        &tcx.query_system.query_vtables.$name,
+                        encoder,
+                        query_result_index,
+                    )
+                }
+            )*
+        }
 
         pub fn query_key_hash_verify_all<'tcx>(tcx: TyCtxt<'tcx>) {
             if tcx.sess.opts.unstable_opts.incremental_verify_ich || cfg!(debug_assertions) {