[lldb-dev] [LLVMdev] Reusing LLVM Mips instruction info in lldb

[Eric Christopher]

On Tue Feb 24 2015 at 1:03:43 PM Keno Fischer <kfischer at college.harvard.edu>
wrote:

> Hello everyone,
>
> in http://reviews.llvm.org/D7696 bhushan added a mips64 UnwindAssembly
> plugin (a plugin that looks at assembly code to find out how to unwind the
> stack frame). Since I was about to write such a plugin (though for mips32)
> myself, I used it as a starting point for a slightly different
> implementation [1], replacing hard coded instruction encodings by calls to
> the LLVM disassembler. This works great, except that the necessary header
> that defines the enum to interpret the opcode in MCInst is generated by
> llvm during the build process using tablegen and is hence not a public
> header. What is the best solution to be able to use this information from
> lldb (which needs to be able to build against a prebuilt copy of LLVM)?
> Would it make sense to move the appropriate .td to
> llvm/include/Target/Mips, so lldb could re-tablegen it and obtain the same
> header (I assume tablegening is deterministic?)?
>

Ugh no. (Though yes, it is deterministic afaik).


> Does anybody see any other good solutions?
>
>
Develop an interface that works and have lldb use that? Might need to
change things to have certain bits be made public if necessary, but I'd
want more details there.

-eric
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