1 files changed, 24 insertions, 0 deletions
diff --git a/compiler/rustc_symbol_mangling/src/typeid.rs b/compiler/rustc_symbol_mangling/src/typeid.rs
index 9228bea43..53983bed7 100644
--- a/compiler/rustc_symbol_mangling/src/typeid.rs
+++ b/compiler/rustc_symbol_mangling/src/typeid.rs
@@ -3,6 +3,8 @@
 
 use rustc_middle::ty::{FnSig, Ty, TyCtxt};
 use rustc_target::abi::call::FnAbi;
+use std::hash::Hasher;
+use twox_hash::XxHash64;
 
 mod typeid_itanium_cxx_abi;
 use typeid_itanium_cxx_abi::TypeIdOptions;
@@ -16,3 +18,25 @@ pub fn typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>)
 pub fn typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> String {
     typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS)
 }
+
+/// Returns an LLVM KCFI type metadata identifier for the specified FnAbi.
+pub fn kcfi_typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> u32 {
+    // An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
+    // of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
+    let mut hash: XxHash64 = Default::default();
+    hash.write(
+        typeid_itanium_cxx_abi::typeid_for_fnabi(tcx, fn_abi, TypeIdOptions::NO_OPTIONS).as_bytes(),
+    );
+    hash.finish() as u32
+}
+
+/// Returns an LLVM KCFI type metadata identifier for the specified FnSig.
+pub fn kcfi_typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> u32 {
+    // An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
+    // of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
+    let mut hash: XxHash64 = Default::default();
+    hash.write(
+        typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS).as_bytes(),
+    );
+    hash.finish() as u32
+}