[llvm-branch-commits] [clang] [clang] Implement function pointer signing and authenticated function calls (PR #93906)

[Daniil Kovalev via llvm-branch-commits]

================
@@ -61,3 +79,28 @@ CodeGen::getConstantSignedPointer(CodeGenModule &CGM, llvm::Constant *Pointer,
   return CGM.getConstantSignedPointer(Pointer, Key, StorageAddress,
                                       OtherDiscriminator);
 }
+
+/// If applicable, sign a given constant function pointer with the ABI rules for
+/// functionType.
+llvm::Constant *CodeGenModule::getFunctionPointer(llvm::Constant *Pointer,
+                                                  QualType FunctionType,
+                                                  GlobalDecl GD) {
+  assert(FunctionType->isFunctionType() ||
+         FunctionType->isFunctionReferenceType() ||
+         FunctionType->isFunctionPointerType());
+
+  if (auto PointerAuth = getFunctionPointerAuthInfo(FunctionType)) {
+    return getConstantSignedPointer(
+      Pointer, PointerAuth.getKey(), nullptr,
----------------
kovdan01 wrote:

nit
```suggestion
      Pointer, PointerAuth.getKey(), /*StorageAddress=*/nullptr,
```

https://github.com/llvm/llvm-project/pull/93906