llvm-project

eddab9b7 - [clang] Fix PointerAuth semantics of cpp_trivially_relocatable (#143969)

[clang] Fix PointerAuth semantics of cpp_trivially_relocatable (#143969) This adds a number of functions to ASTContext to query whether a type contains data protected with address discriminated pointer authentication, and whether the protected values are just vtable pointers, or if there are other address discriminated types included. For the standardized version, __builtin_is_cpp_trivially_relocatable this means accepting types where the only address discriminated values are vtable pointers. Other address discriminated types are not considered relocatable. In addition to that any union containing any address discriminated data, including vtable pointers, is not relocatable. For the old deprecated __builtin_is_trivially_relocatable we reject any type containing any address discriminated value, as it is semantically intended as being a "is this memcopyable" which is not true for anything with address discrimination. This PR does not update the codegen for __builtin_trivially_relocate, that will be in a follow on PR that is much more complex.