cyx-6 commented on PR #254:
URL: https://github.com/apache/tvm-ffi/pull/254#issuecomment-4124919052
> A high-level question is: you used a InitFiniPlugin to handle the
ctors/dtors of the loaded object files. And there are some *Platform in the
orc_rt (or compiler_rt) will register the handling of ctors/dtors. Maybe add
some documentation to explain this (like why on MSVC, we can't depends on the c
runtime library, etc). Is it possible to remove the plugin when the orc_rt has
better support towards the ctors/dtors?
@yaoyaoding here are the status of three platforms
- macOS: MachOPlatform (via orc_rt) handles __mod_init_func/__mod_term_func
and __cxa_atexit natively. We delegate to jit_->initialize()/deinitialize() —
no InitFiniPlugin needed.
- Windows: COFFPlatform is unusable (requires MSVC CRT symbols like
_CxxThrowException, RTTI vtables — stalled in LLVM for 2+ years). Our plugin
handles .CRT$XC*/.CRT$XT* sections.
- Linux: ELFNixPlatform not handles ctor/dtor well, before this commit
https://github.com/llvm/llvm-project/pull/175981. Would be return to
ELFNixPlatform once new llvm release contains this patch commit. So
InitFiniPlugin is still needed.
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