cle: Issue loading binary with exceptions

Heyo! So I was curious to see how angr/cle parses exceptions so I have this library:

#include <iostream>

class DinosaurException { 

public:
    int i;
    DinosaurException() {}
    ~DinosaurException() {}
};

void throw_the_exception(bool throwit) {
    if (throwit) {
        throw DinosaurException();
    }
}

void hello_dinosaur() {
    std::cout << "Hello Dinosaur!" << std::endl;
}

void log(unsigned int count) {
    std::cout << count << std::endl;
}

void catch_the_exception() {
    log(0);
    try {
        log(1);
        hello_dinosaur();
        throw_the_exception(true);
        log(2);
    } catch (const DinosaurException& e) {        
        log(3);
    }

    // more catch statements here
    log(4);
}

int main() {
    catch_the_exception();
    return 0;
}

And then I build it:

g++ -g -c exception.cpp

And then try to load it:

import cle
path = sys.argv[1]
if not os.path.exists(path):
    sys.exit('%s does not exist' % path)
ld = cle.Loader(path, load_debug_info=True, auto_load_libs=False)

And I get the following error:

Traceback (most recent call last):
  File "dev.py", line 11, in <module>
    ld = cle.Loader(path, load_debug_info=True, auto_load_libs=False)
  File "/home/vanessa/Desktop/Code/cle/cle/loader.py", line 133, in __init__
    self.initial_load_objects = self._internal_load(main_binary, *preload_libs, *force_load_libs, preloading=(main_binary, *preload_libs))
  File "/home/vanessa/Desktop/Code/cle/cle/loader.py", line 673, in _internal_load
    obj = self._load_object_isolated(main_spec)
  File "/home/vanessa/Desktop/Code/cle/cle/loader.py", line 855, in _load_object_isolated
    result = backend_cls(binary, binary_stream, is_main_bin=self.main_object is None, loader=self, **options)
  File "/home/vanessa/Desktop/Code/cle/cle/backends/elf/elf.py", line 178, in __init__
    self._load_exception_handling(dwarf)
  File "/home/vanessa/Desktop/Code/cle/cle/backends/elf/elf.py", line 540, in _load_exception_handling
    lsda_exception_table = lsda.parse_lsda(entry.lsda_pointer, file_offset)
  File "/home/vanessa/Desktop/Code/cle/cle/backends/elf/lsda.py", line 97, in parse_lsda
    header = self._parse_lsda_header()
  File "/home/vanessa/Desktop/Code/cle/cle/backends/elf/lsda.py", line 127, in _parse_lsda_header
    raise NotImplementedError("Unsupported modifier %#x." % modifier)
NotImplementedError: Unsupported modifier 0xf0.

I’m guessing there is something specific about my example program (e.g., the “unsupported modifier” I see above) and for the time being I’ll try to inspect exceptions in another program! But I’m wondering what the specific issue is above and if I can fix it?