[PATCH] D121736: Lower `@llvm.global_dtors` using `__cxa_atexit` on MachO

[Julian Lettner via Phabricator via llvm-commits]

yln created this revision.
yln added reviewers: Orlando, RKSimon.
Herald added subscribers: asb, ormris, pengfei, sunfish, hiraditya, jgravelle-google, sbc100, mgorny, dschuff.
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yln requested review of this revision.
Herald added subscribers: llvm-commits, cfe-commits, aheejin.
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For MachO, lower `@llvm.global_dtors` into `@llvm_global_ctors` with
`__cxa_atexit` calls to avoid emitting the deprecated `__mod_term_func`.

Reuse the existing `WebAssemblyLowerGlobalDtors.cpp` to accomplish this.

Enable fallback to the old behavior via Clang driver flag
(`-fregister-global-dtors-with-atexit`) or llc / code generation flag
(`-lower-global-dtors-via-cxa-atexit`).  This escape hatch will be
removed in the future.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121736

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  llvm/docs/Passes.rst
  llvm/include/llvm/CodeGen/CommandFlags.h
  llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
  llvm/include/llvm/InitializePasses.h
  llvm/include/llvm/LinkAllPasses.h
  llvm/include/llvm/Target/TargetOptions.h
  llvm/include/llvm/Transforms/Instrumentation/AddressSanitizerOptions.h
  llvm/include/llvm/Transforms/Utils.h
  llvm/include/llvm/Transforms/Utils/LowerGlobalDtors.h
  llvm/lib/CodeGen/CodeGen.cpp
  llvm/lib/CodeGen/CommandFlags.cpp
  llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Target/WebAssembly/CMakeLists.txt
  llvm/lib/Target/WebAssembly/WebAssembly.h
  llvm/lib/Target/WebAssembly/WebAssemblyLowerGlobalDtors.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
  llvm/lib/Transforms/Utils/CMakeLists.txt
  llvm/lib/Transforms/Utils/LowerGlobalDtors.cpp
  llvm/lib/Transforms/Utils/Utils.cpp
  llvm/test/CodeGen/ARM/ctors_dtors.ll
  llvm/test/CodeGen/X86/2011-08-29-InitOrder.ll
  llvm/test/Transforms/LowerGlobalDestructors/lower-global-dtors.ll

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