Initial support for ptrauth qualified function pointers in C #63204
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This will be used for supporting imported c function pointers with custom __ptrauth qualifier.
… with __ptrauth qualifier
…d field function pointers Access to such pointers are protected by begin_access [signed]/end_access. Generate code to auth/sign them before access.
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This PR adds support for ptrauth qualified non-address discriminated field function pointers in C. It consists of changes in SILGen and IRGen in order to support code generation of such pointers. This can be enabled by setting the flag
-enable-import-ptrauth-field-function-pointers.Summary of changes:
QualType::getPointerAuth()onclang::ValueDecl::getType()to get pointer auth qualifier info from clangbegin_access [signed]/end_accessaround access to signed field function pointersptrauth.authbuiltin before reading andptrauth.signfor writing in to signed field function pointers using a shadow stack slot for translation.