[all-commits] [llvm/llvm-project] 9022d9: [xray] Apply default visibility to __xray_CustomEv...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9022d9c102a8c47616fbeb6a45b015db6bd2c17a
      https://github.com/llvm/llvm-project/commit/9022d9c102a8c47616fbeb6a45b015db6bd2c17a
  Author: Fangrui Song <i at maskray.me>
  Date:   2024-04-12 (Fri, 12 Apr 2024)

  Changed paths:
    M compiler-rt/lib/xray/xray_trampoline_AArch64.S
    M compiler-rt/lib/xray/xray_trampoline_x86_64.S

  Log Message:
  -----------
  [xray] Apply default visibility to __xray_CustomEvent/__xray_TypedEvent

`__xray_customevent` and `__xray_typedevent` are built-in functions in
Clang. With -fxray-instrument, they are lowered to `__xray_CustomEvent`
(with 2 arguments) or `__xray_TypedEvent` (with 3 arguments).

xray patching is supported for shared objects, but they may contain
`__xray_customevent` and `__xray_typedevent` references that need to be
satisfied by default visibility definitions exported by the executable.

lld since df54f627fad789ccb11c72a9fddf116decbeba0e, like GNU ld, catches
the scenario at link time.



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