[PATCH] D125418: [Arm64EC 6/?] Implement C/C++ mangling for Arm64EC function definitions.

[Eli Friedman via Phabricator via cfe-commits]

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Part of initial Arm64EC patchset.

For the Arm64EC ABI, ARM64 functions have an alternate name.  For C code, this name is just the original name prefixed with "#".  For C++ code, we stick a "$$h" modifier in the middle of the mangling.

For functions which are not hybrid_patchable, the normal name is then an alias for the alternate name.  (For functions that are patchable, we have to do something more complicated to tell the linker to generate a stub; I haven't tried to implement that yet.)

This doesn't emit quite the same symbols table as MSVC for simple cases: MSVC generates a IMAGE_WEAK_EXTERN_ANTI_DEPENDENCY alias, where this just makes another symbol pointing at the function definition. This probably matters for the hybmp$x table, but I don't have the complete documentation at the moment.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125418

Files:
  clang/include/clang/AST/Mangle.h
  clang/lib/AST/MicrosoftMangle.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/test/CodeGen/arm64ec.c
  clang/test/CodeGenCXX/arm64ec.cpp

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