Update to bitflags 2 in the compiler

This involves lots of breaking changes. There are two big changes that
force changes. The first is that the bitflag types now don't
automatically implement normal derive traits, so we need to derive them
manually.

Additionally, bitflags now have a hidden inner type by default, which
breaks our custom derives. The bitflags docs recommend using the impl
form in these cases, which I did.

2 files changed, 19 insertions, 7 deletions

diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 3ef87684fa5..93b4032c310 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -150,3 +150,14 @@ pub fn make_display(f: impl Fn(&mut fmt::Formatter<'_>) -> fmt::Result) -> impl
 // See comments in src/librustc_middle/lib.rs
 #[doc(hidden)]
 pub fn __noop_fix_for_27438() {}
+
+#[macro_export]
+macro_rules! external_bitflags_debug {
+    ($Name:ident) => {
+        impl ::std::fmt::Debug for $Name {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
+                ::bitflags::parser::to_writer(self, f)
+            }
+        }
+    };
+}
diff --git a/compiler/rustc_data_structures/src/profiling.rs b/compiler/rustc_data_structures/src/profiling.rs
index ef7375a7320..e29d4811980 100644
--- a/compiler/rustc_data_structures/src/profiling.rs
+++ b/compiler/rustc_data_structures/src/profiling.rs
@@ -101,6 +101,7 @@ use parking_lot::RwLock;
 use smallvec::SmallVec;
 
 bitflags::bitflags! {
+    #[derive(Clone, Copy)]
     struct EventFilter: u16 {
         const GENERIC_ACTIVITIES  = 1 << 0;
         const QUERY_PROVIDERS     = 1 << 1;
@@ -114,14 +115,14 @@ bitflags::bitflags! {
         const INCR_RESULT_HASHING = 1 << 8;
         const ARTIFACT_SIZES = 1 << 9;
 
-        const DEFAULT = Self::GENERIC_ACTIVITIES.bits |
-                        Self::QUERY_PROVIDERS.bits |
-                        Self::QUERY_BLOCKED.bits |
-                        Self::INCR_CACHE_LOADS.bits |
-                        Self::INCR_RESULT_HASHING.bits |
-                        Self::ARTIFACT_SIZES.bits;
+        const DEFAULT = Self::GENERIC_ACTIVITIES.bits() |
+                        Self::QUERY_PROVIDERS.bits() |
+                        Self::QUERY_BLOCKED.bits() |
+                        Self::INCR_CACHE_LOADS.bits() |
+                        Self::INCR_RESULT_HASHING.bits() |
+                        Self::ARTIFACT_SIZES.bits();
 
-        const ARGS = Self::QUERY_KEYS.bits | Self::FUNCTION_ARGS.bits;
+        const ARGS = Self::QUERY_KEYS.bits() | Self::FUNCTION_ARGS.bits();
     }
 }