Add no_force to query macro and move some queries over

src/librustc/dep_graph/dep_node.rs

@@ -538,7 +538,6 @@ rustc_dep_node_append!([define_dep_nodes!][ <'tcx>
     [anon] TraitSelect,
 
     [] ParamEnv(DefId),
-    [] Environment(DefId),
     [] DescribeDef(DefId),
 
     // FIXME(mw): DefSpans are not really inputs since they are derived from
@@ -661,9 +660,6 @@ rustc_dep_node_append!([define_dep_nodes!][ <'tcx>
 
     [input] Features,
 
-    [] ProgramClausesFor(DefId),
-    [] ProgramClausesForEnv(traits::Environment<'tcx>),
-    [] WasmImportModuleMap(CrateNum),
     [] ForeignModules(CrateNum),
 
     [] UpstreamMonomorphizations(CrateNum),

src/librustc/query/mod.rs

@@ -2,8 +2,9 @@ use crate::ty::query::QueryDescription;
 use crate::ty::query::queries;
 use crate::ty::TyCtxt;
 use crate::ty;
-use crate::hir::def_id::CrateNum;
+use crate::hir::def_id::{DefId, CrateNum};
 use crate::dep_graph::SerializedDepNodeIndex;
+use crate::traits;
 use std::borrow::Cow;
 
 // Each of these queries corresponds to a function pointer field in the
@@ -106,4 +107,26 @@ rustc_queries! {
             }
         }
     }
+
+    TypeChecking {
+        query program_clauses_for(_: DefId) -> Clauses<'tcx> {
+            desc { "generating chalk-style clauses" }
+        }
+
+        query program_clauses_for_env(_: traits::Environment<'tcx>) -> Clauses<'tcx> {
+            no_force
+            desc { "generating chalk-style clauses for environment" }
+        }
+
+        // Get the chalk-style environment of the given item.
+        query environment(_: DefId) -> traits::Environment<'tcx> {
+            desc { "return a chalk-style environment" }
+        }
+    }
+
+    Linking {
+        query wasm_import_module_map(_: CrateNum) -> Lrc<FxHashMap<DefId, String>> {
+            desc { "wasm import module map" }
+        }
+    }
 }

src/librustc/ty/query/config.rs

@@ -916,33 +916,9 @@ impl<'tcx> QueryDescription<'tcx> for queries::instance_def_size_estimate<'tcx>
     }
 }
 
-impl<'tcx> QueryDescription<'tcx> for queries::program_clauses_for<'tcx> {
-    fn describe(_tcx: TyCtxt<'_, '_, '_>, _: DefId) -> Cow<'static, str> {
-        "generating chalk-style clauses".into()
-    }
-}
-
-impl<'tcx> QueryDescription<'tcx> for queries::program_clauses_for_env<'tcx> {
-    fn describe(_tcx: TyCtxt<'_, '_, '_>, _: traits::Environment<'tcx>) -> Cow<'static, str> {
-        "generating chalk-style clauses for environment".into()
-    }
-}
-
-impl<'tcx> QueryDescription<'tcx> for queries::environment<'tcx> {
-    fn describe(_tcx: TyCtxt<'_, '_, '_>, _: DefId) -> Cow<'static, str> {
-        "return a chalk-style environment".into()
-    }
-}
-
-impl<'tcx> QueryDescription<'tcx> for queries::wasm_import_module_map<'tcx> {
-    fn describe(_tcx: TyCtxt<'_, '_, '_>, _: CrateNum) -> Cow<'static, str> {
-        "wasm import module map".into()
-    }
-}
-
 impl<'tcx> QueryDescription<'tcx> for queries::dllimport_foreign_items<'tcx> {
     fn describe(_tcx: TyCtxt<'_, '_, '_>, _: CrateNum) -> Cow<'static, str> {
-        "wasm import module map".into()
+        "dllimport_foreign_items".into()
     }
 }
 

src/librustc/ty/query/mod.rs

@@ -683,22 +683,6 @@ rustc_query_append! { [define_queries!][ <'tcx>
 
         [] fn features_query: features_node(CrateNum) -> Lrc<feature_gate::Features>,
     },
-
-    TypeChecking {
-        [] fn program_clauses_for: ProgramClausesFor(DefId) -> Clauses<'tcx>,
-
-        [] fn program_clauses_for_env: ProgramClausesForEnv(
-            traits::Environment<'tcx>
-        ) -> Clauses<'tcx>,
-
-        // Get the chalk-style environment of the given item.
-        [] fn environment: Environment(DefId) -> traits::Environment<'tcx>,
-    },
-
-    Linking {
-        [] fn wasm_import_module_map: WasmImportModuleMap(CrateNum)
-            -> Lrc<FxHashMap<DefId, String>>,
-    },
 ]}
 
 //////////////////////////////////////////////////////////////////////

src/librustc/ty/query/plumbing.rs

@@ -1240,11 +1240,7 @@ pub fn force_from_dep_node<'tcx>(
         DepKind::TypeOpNormalizeFnSig |
         DepKind::SubstituteNormalizeAndTestPredicates |
         DepKind::MethodAutoderefSteps |
-        DepKind::InstanceDefSizeEstimate |
+        DepKind::InstanceDefSizeEstimate => {
-        DepKind::ProgramClausesForEnv |
-
-        // This one should never occur in this context
-        DepKind::Null => {
             bug!("force_from_dep_node() - Encountered {:?}", dep_node)
         }
 
@@ -1311,7 +1307,6 @@ pub fn force_from_dep_node<'tcx>(
         DepKind::CheckMatch => { force!(check_match, def_id!()); }
 
         DepKind::ParamEnv => { force!(param_env, def_id!()); }
-        DepKind::Environment => { force!(environment, def_id!()); }
         DepKind::DescribeDef => { force!(describe_def, def_id!()); }
         DepKind::DefSpan => { force!(def_span, def_id!()); }
         DepKind::LookupStability => { force!(lookup_stability, def_id!()); }
@@ -1419,8 +1414,6 @@ pub fn force_from_dep_node<'tcx>(
 
         DepKind::Features => { force!(features_query, LOCAL_CRATE); }
 
-        DepKind::ProgramClausesFor => { force!(program_clauses_for, def_id!()); }
-        DepKind::WasmImportModuleMap => { force!(wasm_import_module_map, krate!()); }
         DepKind::ForeignModules => { force!(foreign_modules, krate!()); }
 
         DepKind::UpstreamMonomorphizations => {

src/librustc_macros/src/query.rs

@@ -45,6 +45,9 @@ enum QueryModifier {
 
     /// Don't hash the result, instead just mark a query red if it runs
     NoHash,
+
+    /// Don't force the query
+    NoForce,
 }
 
 impl Parse for QueryModifier {
@@ -94,6 +97,8 @@ impl Parse for QueryModifier {
             Ok(QueryModifier::FatalCycle)
         } else if modifier == "no_hash" {
             Ok(QueryModifier::NoHash)
+        } else if modifier == "no_force" {
+            Ok(QueryModifier::NoForce)
         } else {
             Err(Error::new(modifier.span(), "unknown query modifier"))
         }
@@ -194,6 +199,9 @@ struct QueryModifiers {
 
     /// Don't hash the result, instead just mark a query red if it runs
     no_hash: bool,
+
+    /// Don't force the query
+    no_force: bool,
 }
 
 /// Process query modifiers into a struct, erroring on duplicates
@@ -203,6 +211,7 @@ fn process_modifiers(query: &mut Query) -> QueryModifiers {
     let mut desc = None;
     let mut fatal_cycle = false;
     let mut no_hash = false;
+    let mut no_force = false;
     for modifier in query.modifiers.0.drain(..) {
         match modifier {
             QueryModifier::LoadCached(tcx, id, block) => {
@@ -235,6 +244,12 @@ fn process_modifiers(query: &mut Query) -> QueryModifiers {
                 }
                 no_hash = true;
             }
+            QueryModifier::NoForce => {
+                if no_force {
+                    panic!("duplicate modifier `no_force` for query `{}`", query.name);
+                }
+                no_force = true;
+            }
         }
     }
     QueryModifiers {
@@ -243,6 +258,7 @@ fn process_modifiers(query: &mut Query) -> QueryModifiers {
         desc,
         fatal_cycle,
         no_hash,
+        no_force,
     }
 }
 
@@ -329,6 +345,7 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
     let mut query_description_stream = quote! {};
     let mut dep_node_def_stream = quote! {};
     let mut dep_node_force_stream = quote! {};
+    let mut no_force_queries = Vec::new();
 
     for group in groups.0 {
         let mut group_stream = quote! {};
@@ -364,29 +381,46 @@ pub fn rustc_queries(input: TokenStream) -> TokenStream {
                 [#attribute_stream] fn #name: #name(#arg) #result,
             });
 
-            add_query_description_impl(&query, modifiers, &mut query_description_stream);
-
             // Create a dep node for the query
             dep_node_def_stream.extend(quote! {
                 [] #name(#arg),
             });
 
-            // Add a match arm to force the query given the dep node
+            if modifiers.no_force {
-            dep_node_force_stream.extend(quote! {
+                no_force_queries.push(name.clone());
-                DepKind::#name => {
+            } else {
-                    if let Some(key) = RecoverKey::recover($tcx, $dep_node) {
+                // Add a match arm to force the query given the dep node
-                        force_ex!($tcx, #name, key);
+                dep_node_force_stream.extend(quote! {
-                    } else {
+                    DepKind::#name => {
-                        return false;
+                        if let Some(key) = RecoverKey::recover($tcx, $dep_node) {
+                            force_ex!($tcx, #name, key);
+                        } else {
+                            return false;
+                        }
                     }
-                }
+                });
-            });
+            }
+            
+            add_query_description_impl(&query, modifiers, &mut query_description_stream);
         }
         let name = &group.name;
         query_stream.extend(quote! {
             #name { #group_stream },
         });
     }
+
+    // Add an arm for the no force queries to panic when trying to force them
+    for query in no_force_queries {
+        dep_node_force_stream.extend(quote! {
+            DepKind::#query |
+        });
+    }
+    dep_node_force_stream.extend(quote! {
+        DepKind::Null => {
+            bug!("Cannot force dep node: {:?}", $dep_node)
+        }
+    });
+
     TokenStream::from(quote! {
         macro_rules! rustc_query_append {
             ([$($macro:tt)*][$($other:tt)*]) => {