[llvm-branch-commits] [clang] [clang] Implement pointer authentication for C++ virtual functions, v-tables, and VTTs (PR #94056)

[Anton Korobeynikov via llvm-branch-commits]

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@@ -3088,6 +3089,17 @@ QualType ASTContext::removeAddrSpaceQualType(QualType T) const {
     return QualType(TypeNode, Quals.getFastQualifiers());
 }
 
+uint16_t ASTContext::getPointerAuthVTablePointerDiscriminator(
+    const CXXRecordDecl *record) {
+  assert(record->isPolymorphic() &&
+         "Attempted to get vtable pointer discriminator on a monomorphic type");
+  std::unique_ptr<MangleContext> MC(createMangleContext());
+  SmallString<256> Str;
+  llvm::raw_svector_ostream Out(Str);
+  MC->mangleCXXVTable(record, Out);
+  return llvm::getPointerAuthStableSipHash16(Str.c_str());
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asl wrote:

```suggestion
  return llvm::getPointerAuthStableSipHash16(Str.str());
```

https://github.com/llvm/llvm-project/pull/94056