Derive which queries to save using the proc macro

src/librustc/query/mod.rs

@@ -422,11 +422,6 @@ rustc_queries! {
                 "const-evaluating `{}`",
                 tcx.def_path_str(key.value.instance.def.def_id())
             }
-            cache_on_disk_if(_, opt_result) {
-                // Only store results without errors
-                // FIXME: We never store these
-                opt_result.map_or(true, |r| r.is_ok())
-            }
         }
 
         /// Results of evaluating const items or constants embedded in

src/librustc/ty/query/on_disk_cache.rs

@@ -201,28 +201,22 @@ impl<'sess> OnDiskCache<'sess> {
             let mut query_result_index = EncodedQueryResultIndex::new();
 
             time(tcx.sess, "encode query results", || {
-                use crate::ty::query::queries::*;
                 let enc = &mut encoder;
                 let qri = &mut query_result_index;
 
-                encode_query_results::<type_of<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<generics_of<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<predicates_of<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<used_trait_imports<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<typeck_tables_of<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<codegen_fulfill_obligation<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<optimized_mir<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<unsafety_check_result<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<borrowck<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<mir_borrowck<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<mir_const_qualif<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<const_is_rvalue_promotable_to_static<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<symbol_name<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<check_match<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<codegen_fn_attrs<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<specialization_graph_of<'_>, _>(tcx, enc, qri)?;
-                encode_query_results::<const_eval<'_>, _>(tcx, enc, qri)?;
-                // FIXME: Include const_eval_raw?
+                macro_rules! encode_queries {
+                    ($($query:ident,)*) => {
+                        $(
+                            encode_query_results::<ty::query::queries::$query<'_>, _>(
+                                tcx,
+                                enc,
+                                qri
+                            )?;
+                        )*
+                    }
+                }
+
+                rustc_cached_queries!(encode_queries!);
 
                 Ok(())
             })?;

src/librustc_macros/src/query.rs

@@ -414,6 +414,7 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
     let mut dep_node_force_stream = quote! {};
     let mut try_load_from_on_disk_cache_stream = quote! {};
     let mut no_force_queries = Vec::new();
+    let mut cached_queries = quote! {};
 
     for group in groups.0 {
         let mut group_stream = quote! {};
@@ -427,6 +428,12 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
                 _ => quote! { #result_full },
             };
 
+            if modifiers.cache.is_some() {
+                cached_queries.extend(quote! {
+                    #name,
+                });
+            }
+
             if modifiers.cache.is_some() && !modifiers.no_force {
                 try_load_from_on_disk_cache_stream.extend(quote! {
                     DepKind::#name => {
@@ -549,6 +556,12 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
                 }
             }
         }
+        macro_rules! rustc_cached_queries {
+            ($($macro:tt)*) => {
+                $($macro)*(#cached_queries);
+            }
+        }
+
         #query_description_stream
 
         impl DepNode {