[PATCH] D125648: [ARM SEH 6] [ARM] Add SEH opcodes in frame lowering

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo created this revision.
mstorsjo added reviewers: efriedma, rnk, zzheng.
Herald added subscribers: hiraditya, kristof.beyls.
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Skip inserting regular CFI instructions if using WinCFI.

This is based a fair amount on the corresponding ARM64 implementation,
but instead of trying to insert the SEH opcodes one by one where
we generate other prolog/epilog instructions, we try to walk over the
whole prolog/epilog range and insert them. This is done because in
many cases, the exact number of instructions inserted is abstracted
away deeper.

For some cases, we manually insert specific SEH opcodes directly where
instructions are generated, where the automatic mapping of instructions
to SEH opcodes doesn't hold up (e.g. for __chkstk stack probes).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125648

Files:
  llvm/lib/Target/ARM/ARMAsmPrinter.cpp
  llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
  llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
  llvm/lib/Target/ARM/ARMFrameLowering.cpp
  llvm/lib/Target/ARM/ARMInstrInfo.td
  llvm/lib/Target/ARM/ARMSubtarget.cpp
  llvm/test/CodeGen/ARM/Windows/wineh-opcodes.ll

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