[llvm-branch-commits] [llvm] Add llvm.protected.field.ptr intrinsic and pre-ISel lowering. (PR #151647)

[Nikita Popov via llvm-branch-commits]

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@@ -461,6 +463,139 @@ bool PreISelIntrinsicLowering::expandMemIntrinsicUses(
   return Changed;
 }
 
+static bool expandProtectedFieldPtr(Function &Intr) {
+  Module &M = *Intr.getParent();
+
+  SmallPtrSet<GlobalValue *, 2> DSsToDeactivate;
+
+  Type *Int8Ty = Type::getInt8Ty(M.getContext());
+  Type *Int64Ty = Type::getInt64Ty(M.getContext());
+  PointerType *PtrTy = PointerType::get(M.getContext(), 0);
+
+  Function *SignIntr =
+      Intrinsic::getOrInsertDeclaration(&M, Intrinsic::ptrauth_sign, {});
+  Function *AuthIntr =
+      Intrinsic::getOrInsertDeclaration(&M, Intrinsic::ptrauth_auth, {});
+
+  auto *EmuFnTy = FunctionType::get(Int64Ty, {Int64Ty, Int64Ty}, false);
+  FunctionCallee EmuSignIntr = M.getOrInsertFunction("__emupac_pacda", EmuFnTy);
+  FunctionCallee EmuAuthIntr = M.getOrInsertFunction("__emupac_autda", EmuFnTy);
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nikic wrote:

We should avoid inserting function declarations that are not going to be used. I think this late we'll end up actually emitting those symbols.

https://github.com/llvm/llvm-project/pull/151647