polymorphize: polymorphize shims

This commit removes the restriction of `InstanceDef::Item` on
polymorphization, so that shims can now be polymorphized.

Signed-off-by: David Wood <david.wood@huawei.com>

compiler/rustc_monomorphize/src/collector.rs

@@ -936,21 +936,13 @@ fn visit_instance_use<'tcx>(
     }
 }
 
-// Returns `true` if we should codegen an instance in the local crate.
-// Returns `false` if we can just link to the upstream crate and therefore don't
-// need a mono item.
+/// Returns `true` if we should codegen an instance in the local crate, or returns `false` if we
+/// can just link to the upstream crate and therefore don't need a mono item.
 fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: &Instance<'tcx>) -> bool {
-    let def_id = match instance.def {
-        ty::InstanceDef::Item(def) => def.did,
-        ty::InstanceDef::DropGlue(def_id, Some(_)) => def_id,
-        ty::InstanceDef::VtableShim(..)
-        | ty::InstanceDef::ReifyShim(..)
-        | ty::InstanceDef::ClosureOnceShim { .. }
-        | ty::InstanceDef::Virtual(..)
-        | ty::InstanceDef::FnPtrShim(..)
-        | ty::InstanceDef::DropGlue(..)
-        | ty::InstanceDef::Intrinsic(_)
-        | ty::InstanceDef::CloneShim(..) => return true,
+    let def_id = if let Some(def_id) = instance.def.def_id_if_not_guaranteed_local_codegen() {
+        def_id
+    } else {
+        return true;
     };
 
     if tcx.is_foreign_item(def_id) {

compiler/rustc_monomorphize/src/polymorphize.rs

@@ -27,20 +27,23 @@ pub fn provide(providers: &mut Providers) {
     providers.unused_generic_params = unused_generic_params;
 }
 
-/// Determine which generic parameters are used by the function/method/closure represented by
-/// `def_id`. Returns a bitset where bits representing unused parameters are set (`is_empty`
-/// indicates all parameters are used).
+/// Determine which generic parameters are used by the instance.
+///
+/// Returns a bitset where bits representing unused parameters are set (`is_empty` indicates all
+/// parameters are used).
 #[instrument(level = "debug", skip(tcx))]
-fn unused_generic_params(tcx: TyCtxt<'_>, def_id: DefId) -> FiniteBitSet<u32> {
+fn unused_generic_params<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    instance: ty::InstanceDef<'tcx>,
+) -> FiniteBitSet<u32> {
     if !tcx.sess.opts.debugging_opts.polymorphize {
         // If polymorphization disabled, then all parameters are used.
         return FiniteBitSet::new_empty();
     }
 
-    // Polymorphization results are stored in cross-crate metadata only when there are unused
-    // parameters, so assume that non-local items must have only used parameters (else this query
-    // would not be invoked, and the cross-crate metadata used instead).
-    if !def_id.is_local() {
+    let def_id = instance.def_id();
+    // Exit early if this instance should not be polymorphized.
+    if !should_polymorphize(tcx, def_id, instance) {
         return FiniteBitSet::new_empty();
     }
 
@@ -52,38 +55,20 @@ fn unused_generic_params(tcx: TyCtxt<'_>, def_id: DefId) -> FiniteBitSet<u32> {
         return FiniteBitSet::new_empty();
     }
 
-    // Exit early for foreign items, these have no bodies to analyze.
-    if tcx.is_foreign_item(def_id) {
-        return FiniteBitSet::new_empty();
-    }
-
-    // Exit early when there is no MIR available.
-    let context = tcx.hir().body_const_context(def_id.expect_local());
-    match context {
-        Some(ConstContext::ConstFn) | None if !tcx.is_mir_available(def_id) => {
-            debug!("no mir available");
-            return FiniteBitSet::new_empty();
-        }
-        Some(_) if !tcx.is_ctfe_mir_available(def_id) => {
-            debug!("no ctfe mir available");
-            return FiniteBitSet::new_empty();
-        }
-        _ => {}
-    }
-
     // Create a bitset with N rightmost ones for each parameter.
     let generics_count: u32 =
         generics.count().try_into().expect("more generic parameters than can fit into a `u32`");
     let mut unused_parameters = FiniteBitSet::<u32>::new_empty();
     unused_parameters.set_range(0..generics_count);
     debug!(?unused_parameters, "(start)");
+
     mark_used_by_default_parameters(tcx, def_id, generics, &mut unused_parameters);
     debug!(?unused_parameters, "(after default)");
 
     // Visit MIR and accumululate used generic parameters.
-    let body = match context {
+    let body = match tcx.hir().body_const_context(def_id.expect_local()) {
         // Const functions are actually called and should thus be considered for polymorphization
-        // via their runtime MIR
+        // via their runtime MIR.
         Some(ConstContext::ConstFn) | None => tcx.optimized_mir(def_id),
         Some(_) => tcx.mir_for_ctfe(def_id),
     };
@@ -99,6 +84,49 @@ fn unused_generic_params(tcx: TyCtxt<'_>, def_id: DefId) -> FiniteBitSet<u32> {
     unused_parameters
 }
 
+/// Returns `true` if the instance should be polymorphized.
+fn should_polymorphize<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    def_id: DefId,
+    instance: ty::InstanceDef<'tcx>,
+) -> bool {
+    // If an instance's MIR body is not polymorphic then the modified substitutions that are
+    // derived from polymorphization's result won't make any difference.
+    if !instance.has_polymorphic_mir_body() {
+        return false;
+    }
+
+    // Don't polymorphize intrinsics or virtual calls - calling `instance_mir` will panic.
+    if matches!(instance, ty::InstanceDef::Intrinsic(..) | ty::InstanceDef::Virtual(..)) {
+        return false;
+    }
+
+    // Polymorphization results are stored in cross-crate metadata only when there are unused
+    // parameters, so assume that non-local items must have only used parameters (else this query
+    // would not be invoked, and the cross-crate metadata used instead).
+    if !def_id.is_local() {
+        return false;
+    }
+
+    // Foreign items have no bodies to analyze.
+    if tcx.is_foreign_item(def_id) {
+        return false;
+    }
+
+    // Make sure there is MIR available.
+    match tcx.hir().body_const_context(def_id.expect_local()) {
+        Some(ConstContext::ConstFn) | None if !tcx.is_mir_available(def_id) => {
+            debug!("no mir available");
+            return false;
+        }
+        Some(_) if !tcx.is_ctfe_mir_available(def_id) => {
+            debug!("no ctfe mir available");
+            return false;
+        }
+        _ => true,
+    }
+}
+
 /// Some parameters are considered used-by-default, such as non-generic parameters and the dummy
 /// generic parameters from closures, this function marks them as used. `leaf_is_closure` should
 /// be `true` if the item that `unused_generic_params` was invoked on is a closure.
@@ -207,7 +235,8 @@ impl<'a, 'tcx> MarkUsedGenericParams<'a, 'tcx> {
     /// a closure, generator or constant).
     #[instrument(level = "debug", skip(self, def_id, substs))]
     fn visit_child_body(&mut self, def_id: DefId, substs: SubstsRef<'tcx>) {
-        let unused = self.tcx.unused_generic_params(def_id);
+        let instance = ty::InstanceDef::Item(ty::WithOptConstParam::unknown(def_id));
+        let unused = self.tcx.unused_generic_params(instance);
         debug!(?self.unused_parameters, ?unused);
         for (i, arg) in substs.iter().enumerate() {
             let i = i.try_into().unwrap();