[all-commits] [llvm/llvm-project] de3633: [llvm-objdump][COFF] Correctly decode `UOP_Epilog`...

[Arpad Borsos via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: de3633e746dba4774ba7f638f04e9c8f2541fd54
      https://github.com/llvm/llvm-project/commit/de3633e746dba4774ba7f638f04e9c8f2541fd54
  Author: Arpad Borsos <swatinem at swatinem.de>
  Date:   2022-09-01 (Thu, 01 Sep 2022)

  Changed paths:
    M llvm/tools/llvm-objdump/COFFDump.cpp

  Log Message:
  -----------
  [llvm-objdump][COFF] Correctly decode `UOP_Epilog` opcodes

At least `ntdll` is using the undocumented version 2 unwind info, and opcode 6, which is already defined as `UOP_Epilog`.
Using `llvm-objdump --unwind` with `ntdll` would previously result in unreachable assertions because this code was missing from `getNumUsedSlots` and `getUnwindCodeTypeName`.
The slots of these codes comes from https://github.com/dotnet/runtime/blob/57bfe474518ab5b7cfe6bf7424a79ce3af9d6657/src/coreclr/inc/win64unwind.h#L51-L52 which I would assume is a good authoritative source.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D107655