[PATCH] D94659: [yaml2obj/obj2yaml] - Refine handling of SHT_GNU_verdef sections.

[George Rimar via Phabricator via llvm-commits]

grimar created this revision.
grimar added reviewers: jhenderson, MaskRay.
Herald added subscribers: dmgreen, hiraditya, emaste.
Herald added a reviewer: espindola.
grimar requested review of this revision.
Herald added a project: LLVM.

This patch:

1. Makes `Version`, `Flags`, `VersionNdx` and `Hash` fields to be `Optional<>`.
2. Disallows dumping version definitions that have `vd_version != 1`. `vd_version` identifies the version of the structure itself. (https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/symverdefs.html, https://docs.oracle.com/cd/E19683-01/816-7777/chapter6-80869/index.html)
3. Stops dumping default values for `Version`, `Flags`, `VersionNdx` and `Hash` fields.
4. Refines testing.


https://reviews.llvm.org/D94659

Files:
  llvm/include/llvm/ObjectYAML/ELFYAML.h
  llvm/lib/ObjectYAML/ELFEmitter.cpp
  llvm/lib/ObjectYAML/ELFYAML.cpp
  llvm/test/tools/obj2yaml/ELF/verdef-section.yaml
  llvm/test/tools/yaml2obj/ELF/verdef-section.yaml
  llvm/tools/obj2yaml/elf2yaml.cpp

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