[Lldb-commits] [lldb] [lldb][AIX] Added XCOFF Object File Header for AIX (PR #111814)

[Dhruv Srivastava via lldb-commits]

DhruvSrivastavaX wrote:

> A couple of quick notes:
> 
> * are you sure that ObjectFileELF is the best thing to start with here? Based on the name, I would expect that ObjectFilePECOFF would be a better baseline. Or maybe the object file format is different enough from all of the existing ones that this kind of comparison is not useful?
> * without also seeing the cpp file, it hard to judge how similar it is to the other plugin
> * instead of redeclaring all the header types, would it be possible to use some structures from llvm? (I know that ObjectFileELF does not do that, but that's because it is very old. ObjectFilePECOFF -- a much newer class -- does just that)
> * a lot of the object file code should be testable on its own. If you include the necessary plugin glue in this PR, then you should be able to write tests similar to those in `lldb/test/Shell/ObjectFile`. For example, if you could start with a test similar to `test/Shell/ObjectFile/ELF/basic-info.yaml` and then include enough of code in the PR to make that pass.

Hi @labath , 

1. Actually there might be slight similarities with ObjectFilePECOFF, but the overall format structure is very different to be compared to any one of the existing formats, so I have just taken the ObjectFileELF.h as a base to follow the general class/file arrangement. 
2. As per our last discussion, I have planned to drop each of the major files separately, so I can push the .cpp file as another commit, and both of these can be used for comparison. 
3. From a surface level I can see that ObjectFilePECOFF has also created its own new structures based on its file format, essentially we have done something similar for XCOFF. Although, let me check the existing llvm structures for XCOFF thoroughly and get back to you on this. 
4. So, as per your suggestion, what path flow should we take? 
Based on previous discussions, as of now I am planning a commit for .h file, another commit for .cpp file and a final commit for the test cases. Is that okay?

https://github.com/llvm/llvm-project/pull/111814