Merging upstream version 1.70.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 50 insertions, 5 deletions

diff --git a/compiler/rustc_middle/src/ty/instance.rs b/compiler/rustc_middle/src/ty/instance.rs
index f4028a5a9..e73225f70 100644
--- a/compiler/rustc_middle/src/ty/instance.rs
+++ b/compiler/rustc_middle/src/ty/instance.rs
@@ -82,6 +82,11 @@ pub enum InstanceDef<'tcx> {
     /// The `DefId` is the ID of the `call_once` method in `FnOnce`.
     ClosureOnceShim { call_once: DefId, track_caller: bool },
 
+    /// Compiler-generated accessor for thread locals which returns a reference to the thread local
+    /// the `DefId` defines. This is used to export thread locals from dylibs on platforms lacking
+    /// native support.
+    ThreadLocalShim(DefId),
+
     /// `core::ptr::drop_in_place::<T>`.
     ///
     /// The `DefId` is for `core::ptr::drop_in_place`.
@@ -96,6 +101,13 @@ pub enum InstanceDef<'tcx> {
     ///
     /// The `DefId` is for `Clone::clone`, the `Ty` is the type `T` with the builtin `Clone` impl.
     CloneShim(DefId, Ty<'tcx>),
+
+    /// Compiler-generated `<T as FnPtr>::addr` implementation.
+    ///
+    /// Automatically generated for all potentially higher-ranked `fn(I) -> R` types.
+    ///
+    /// The `DefId` is for `FnPtr::addr`, the `Ty` is the type `T`.
+    FnPtrAddrShim(DefId, Ty<'tcx>),
 }
 
 impl<'tcx> Instance<'tcx> {
@@ -149,9 +161,11 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::FnPtrShim(def_id, _)
             | InstanceDef::Virtual(def_id, _)
             | InstanceDef::Intrinsic(def_id)
+            | InstanceDef::ThreadLocalShim(def_id)
             | InstanceDef::ClosureOnceShim { call_once: def_id, track_caller: _ }
             | InstanceDef::DropGlue(def_id, _)
-            | InstanceDef::CloneShim(def_id, _) => def_id,
+            | InstanceDef::CloneShim(def_id, _)
+            | InstanceDef::FnPtrAddrShim(def_id, _) => def_id,
         }
     }
 
@@ -159,7 +173,9 @@ impl<'tcx> InstanceDef<'tcx> {
     pub fn def_id_if_not_guaranteed_local_codegen(self) -> Option<DefId> {
         match self {
             ty::InstanceDef::Item(def) => Some(def.did),
-            ty::InstanceDef::DropGlue(def_id, Some(_)) => Some(def_id),
+            ty::InstanceDef::DropGlue(def_id, Some(_)) | InstanceDef::ThreadLocalShim(def_id) => {
+                Some(def_id)
+            }
             InstanceDef::VTableShim(..)
             | InstanceDef::ReifyShim(..)
             | InstanceDef::FnPtrShim(..)
@@ -167,7 +183,8 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::Intrinsic(..)
             | InstanceDef::ClosureOnceShim { .. }
             | InstanceDef::DropGlue(..)
-            | InstanceDef::CloneShim(..) => None,
+            | InstanceDef::CloneShim(..)
+            | InstanceDef::FnPtrAddrShim(..) => None,
         }
     }
 
@@ -182,12 +199,18 @@ impl<'tcx> InstanceDef<'tcx> {
             | InstanceDef::Intrinsic(def_id)
             | InstanceDef::ClosureOnceShim { call_once: def_id, track_caller: _ }
             | InstanceDef::DropGlue(def_id, _)
-            | InstanceDef::CloneShim(def_id, _) => ty::WithOptConstParam::unknown(def_id),
+            | InstanceDef::CloneShim(def_id, _)
+            | InstanceDef::ThreadLocalShim(def_id)
+            | InstanceDef::FnPtrAddrShim(def_id, _) => ty::WithOptConstParam::unknown(def_id),
         }
     }
 
     #[inline]
-    pub fn get_attrs(&self, tcx: TyCtxt<'tcx>, attr: Symbol) -> ty::Attributes<'tcx> {
+    pub fn get_attrs(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        attr: Symbol,
+    ) -> impl Iterator<Item = &'tcx rustc_ast::Attribute> {
         tcx.get_attrs(self.def_id(), attr)
     }
 
@@ -201,6 +224,7 @@ impl<'tcx> InstanceDef<'tcx> {
         let def_id = match *self {
             ty::InstanceDef::Item(def) => def.did,
             ty::InstanceDef::DropGlue(_, Some(_)) => return false,
+            ty::InstanceDef::ThreadLocalShim(_) => return false,
             _ => return true,
         };
         matches!(
@@ -241,6 +265,9 @@ impl<'tcx> InstanceDef<'tcx> {
                 )
             });
         }
+        if let ty::InstanceDef::ThreadLocalShim(..) = *self {
+            return false;
+        }
         tcx.codegen_fn_attrs(self.def_id()).requests_inline()
     }
 
@@ -264,6 +291,8 @@ impl<'tcx> InstanceDef<'tcx> {
     pub fn has_polymorphic_mir_body(&self) -> bool {
         match *self {
             InstanceDef::CloneShim(..)
+            | InstanceDef::ThreadLocalShim(..)
+            | InstanceDef::FnPtrAddrShim(..)
             | InstanceDef::FnPtrShim(..)
             | InstanceDef::DropGlue(_, Some(_)) => false,
             InstanceDef::ClosureOnceShim { .. }
@@ -295,6 +324,7 @@ fn fmt_instance(
         InstanceDef::Item(_) => Ok(()),
         InstanceDef::VTableShim(_) => write!(f, " - shim(vtable)"),
         InstanceDef::ReifyShim(_) => write!(f, " - shim(reify)"),
+        InstanceDef::ThreadLocalShim(_) => write!(f, " - shim(tls)"),
         InstanceDef::Intrinsic(_) => write!(f, " - intrinsic"),
         InstanceDef::Virtual(_, num) => write!(f, " - virtual#{}", num),
         InstanceDef::FnPtrShim(_, ty) => write!(f, " - shim({})", ty),
@@ -302,6 +332,7 @@ fn fmt_instance(
         InstanceDef::DropGlue(_, None) => write!(f, " - shim(None)"),
         InstanceDef::DropGlue(_, Some(ty)) => write!(f, " - shim(Some({}))", ty),
         InstanceDef::CloneShim(_, ty) => write!(f, " - shim({})", ty),
+        InstanceDef::FnPtrAddrShim(_, ty) => write!(f, " - shim({})", ty),
     }
 }
 
@@ -781,6 +812,12 @@ fn needs_fn_once_adapter_shim(
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Decodable, Encodable, HashStable)]
 pub struct UnusedGenericParams(FiniteBitSet<u32>);
 
+impl Default for UnusedGenericParams {
+    fn default() -> Self {
+        UnusedGenericParams::new_all_used()
+    }
+}
+
 impl UnusedGenericParams {
     pub fn new_all_unused(amount: u32) -> Self {
         let mut bitset = FiniteBitSet::new_empty();
@@ -807,4 +844,12 @@ impl UnusedGenericParams {
     pub fn all_used(&self) -> bool {
         self.0.is_empty()
     }
+
+    pub fn bits(&self) -> u32 {
+        self.0.0
+    }
+
+    pub fn from_bits(bits: u32) -> UnusedGenericParams {
+        UnusedGenericParams(FiniteBitSet(bits))
+    }
 }