[PATCH] D142176: [libunwind] On Darwin, add a callback-based lookup scheme for JIT'd unwind info.

[Vassil Vassilev via Phabricator via llvm-commits]

v.g.vassilev added a comment.

In D142176#4075822 <https://reviews.llvm.org/D142176#4075822>, @lhames wrote:

> Here's a potential testcase, for anyone who wants to try this out. You'll need to build LLVM, compiler-rt, and libunwind:
>
> C++ source for testcase:
>
>   int main(int argc, char *argv[]) {
>     try {
>       throw 42;
>     } catch (int X) {
>       return X;
>     }
>     return 0;
>   }
>
> This can be compiled and run under the `llvm-jitlink` test tool on Darwin with:
>
>   % clang++ -c -o eh.o eh.cpp
>   % DYLD_LIBRARY_PATH=/path/to/llvm-build/lib ORC_RT_DEBUG=1 llvm-jitlink -orc-runtime=/path/to/llvm-build/lib/clang/16/lib/darwin/liborc_rt_osx.a eh.o
>   __unw_add/remove_find_dynamic_unwind_sections available. Using callback-based frame info lookup.
>   ...
>
> You can verify that the exception was caught and handled correctly by printing the return code:
>
>   % echo $?
>   42

I was wondering if it is feasible to add a regression test in `clang-repl`, possibly now with the right callback?


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