mangling: encode all impl parameters

This commit modifies v0 symbol mangling to include all generic
parameters from impl blocks (not just those used in the self type).

Signed-off-by: David Wood <david@davidtw.co>

compiler/rustc_symbol_mangling/src/v0.rs

@@ -259,7 +259,7 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
     }
 
     fn print_impl_path(
-        self,
+        mut self,
         impl_def_id: DefId,
         substs: &'tcx [GenericArg<'tcx>],
         mut self_ty: Ty<'tcx>,
@@ -284,12 +284,37 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
             }
         }
 
-        self.path_append_impl(
-            |cx| cx.print_def_path(parent_def_id, &[]),
-            &key.disambiguated_data,
-            self_ty,
-            impl_trait_ref,
-        )
+        self.push(match impl_trait_ref {
+            Some(_) => "X",
+            None => "M",
+        });
+
+        // Encode impl generic params if the substitutions contain parameters (implying
+        // polymorphization is enabled) and this isn't an inherent impl.
+        if impl_trait_ref.is_some() && substs.iter().any(|a| a.has_param_types_or_consts()) {
+            self = self.path_generic_args(
+                |this| {
+                    this.path_append_ns(
+                        |cx| cx.print_def_path(parent_def_id, &[]),
+                        'I',
+                        key.disambiguated_data.disambiguator as u64,
+                        "",
+                    )
+                },
+                substs,
+            )?;
+        } else {
+            self.push_disambiguator(key.disambiguated_data.disambiguator as u64);
+            self = self.print_def_path(parent_def_id, &[])?;
+        }
+
+        self = self_ty.print(self)?;
+
+        if let Some(trait_ref) = impl_trait_ref {
+            self = self.print_def_path(trait_ref.def_id, trait_ref.substs)?;
+        }
+
+        Ok(self)
     }
 
     fn print_region(mut self, region: ty::Region<'_>) -> Result<Self::Region, Self::Error> {
@@ -538,6 +563,7 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
         self.push_ident(&name);
         Ok(self)
     }
+
     fn path_qualified(
         mut self,
         self_ty: Ty<'tcx>,
@@ -552,24 +578,16 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
     }
 
     fn path_append_impl(
-        mut self,
-        print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
-        disambiguated_data: &DisambiguatedDefPathData,
-        self_ty: Ty<'tcx>,
-        trait_ref: Option<ty::TraitRef<'tcx>>,
+        self,
+        _: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
+        _: &DisambiguatedDefPathData,
+        _: Ty<'tcx>,
+        _: Option<ty::TraitRef<'tcx>>,
     ) -> Result<Self::Path, Self::Error> {
-        self.push(match trait_ref {
-            Some(_) => "X",
-            None => "M",
-        });
-        self.push_disambiguator(disambiguated_data.disambiguator as u64);
-        self = print_prefix(self)?;
-        self = self_ty.print(self)?;
-        if let Some(trait_ref) = trait_ref {
-            self = self.print_def_path(trait_ref.def_id, trait_ref.substs)?;
-        }
-        Ok(self)
+        // Inlined into `print_impl_path`
+        unreachable!()
     }
+
     fn path_append(
         self,
         print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,
@@ -603,6 +621,7 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
             name.as_ref().map_or("", |s| &s[..]),
         )
     }
+
     fn path_generic_args(
         mut self,
         print_prefix: impl FnOnce(Self) -> Result<Self::Path, Self::Error>,

src/test/ui/symbol-names/issue-75326.legacy.stderr

@@ -0,0 +1,20 @@
+error: symbol-name(_ZN72_$LT$issue_75326..Foo$LT$I$C$E$GT$$u20$as$u20$issue_75326..Iterator2$GT$4next17SYMBOL_HASH)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next::SYMBOL_HASH)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+

src/test/ui/symbol-names/issue-75326.rs

@@ -0,0 +1,58 @@
+// build-fail
+// ignore-tidy-linelength
+// revisions: legacy v0
+//[legacy]compile-flags: -Z symbol-mangling-version=legacy
+//[v0]compile-flags: -Z symbol-mangling-version=v0
+//[legacy]normalize-stderr-32bit: "h[\d\w]+" -> "SYMBOL_HASH"
+//[legacy]normalize-stderr-64bit: "h[\d\w]+" -> "SYMBOL_HASH"
+
+#![feature(rustc_attrs)]
+
+pub(crate) struct Foo<I, E>(I, E);
+
+pub trait Iterator2 {
+    type Item;
+
+    fn next(&mut self) -> Option<Self::Item>;
+
+    fn find<P>(&mut self, predicate: P) -> Option<Self::Item>
+    where
+        Self: Sized,
+        P: FnMut(&Self::Item) -> bool,
+    {
+        unimplemented!()
+    }
+}
+
+struct Bar;
+
+impl Iterator2 for Bar {
+    type Item = (u32, u16);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        unimplemented!()
+    }
+}
+
+impl<I, T, E> Iterator2 for Foo<I, E>
+where
+    I: Iterator2<Item = (T, E)>,
+{
+    type Item = T;
+
+    #[rustc_symbol_name]
+    //[legacy]~^ ERROR symbol-name(_ZN72_$LT$issue_75326..Foo$LT$I$C$E$GT$$u20$as$u20$issue_75326..Iterator2$GT$4next
+    //[legacy]~| ERROR demangling(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next
+    //[legacy]~| ERROR demangling-alt(<issue_75326::Foo<I,E> as issue_75326::Iterator2>::next)
+    //[v0]~^^^^  ERROR symbol-name(_RNvXINICs4fqI2P2rA04_11issue_75326s_0pppEINtB5_3FooppENtB5_9Iterator24nextB5_)
+    //[v0]~|     ERROR demangling(<issue_75326[317d481089b8c8fe]::Foo<_, _> as issue_75326[317d481089b8c8fe]::Iterator2>::next)
+    //[v0]~|     ERROR demangling-alt(<issue_75326::Foo<_, _> as issue_75326::Iterator2>::next)
+    fn next(&mut self) -> Option<Self::Item> {
+        self.find(|_| true)
+    }
+}
+
+fn main() {
+    let mut a = Foo(Bar, 1u16);
+    let _ = a.next();
+}

src/test/ui/symbol-names/issue-75326.v0.stderr

@@ -0,0 +1,20 @@
+error: symbol-name(_RNvXINICs4fqI2P2rA04_11issue_75326s_0pppEINtB5_3FooppENtB5_9Iterator24nextB5_)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<issue_75326[317d481089b8c8fe]::Foo<_, _> as issue_75326[317d481089b8c8fe]::Iterator2>::next)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<issue_75326::Foo<_, _> as issue_75326::Iterator2>::next)
+  --> $DIR/issue-75326.rs:43:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+