[llvm-dev] ORC JIT api, object files and stackmaps

[Christian Schafmeister via llvm-dev]

I have a few questions about the new ORC JIT.

I saw Lang Hames (hi!) excellent talk at the llvm-dev meeting a few weeks
ago. The ORC JIT is undergoing some API changes and I'd like/need to take
advantage of them.

(1) How do I take ownership of the ObjectFile once the ORC JIT has created
it?
    I'd like to take ownership of object files generated by the ORC JIT so
that I can save them to disk and in later sessions reload them.
(2) How would I pass an ObjectFile saved in question#1 back to ORC so that
it will relocate it and generate function pointers?
(3) How do I get access to the relocated ObjectFile sections?
    Currently I subclass SectionMemoryManager and implement
allocateDataSection(...)
    I can get the memory for the "__llvm_stackmaps" section - but I don't
know when/if the contents have been fully set up with relocated function
pointers.
(4) For the "__llvm_stackmaps" section - will I need to do any relocation
to obtain the function pointers?

Background:
I'm using llvm.experimental.stackmaps to register one variable in each
stack frame that contains spilled register arguments.
I've figured out how to get access to the stackmaps for code that I load
into my system from dynamic libraries that our compiler generates.
The answers to questions above will help me get access to the stackmaps
from ORC JITted code.

-- 
Christian Schafmeister
Professor, Chemistry Department
Temple University
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