[libc++][WIP] Implement P0881R7 (std::stacktrace)

[philnik]

Summary

The tests are currently incomplete. There are also still some other things not implemented that are required here.

[Mordante]

Nice see this being worked on!
I mainly looked at the code out of curiosity, I didn't do a review.

libcxx/include/__stacktrace/basic_stacktrace.h

24

Since this function is in the dylib it needs an availability macro in <__availability>.

libcxx/src/stacktrace/stacktrace_entry.cpp

41

When line 45 throws the pointer leaks.
I would suggest to do something like

// Unused; the returned pointer is used to test the conversion status.
int __s;
unique_ptr<char, void (*)(void*)> __demangled{abi::__cxa_demangle(__name, nullptr, 0, &__s), std::free};

(I wrote this for a libc++ formatting experiment.)

[philnik]

• Fix CI

[philnik]

libcxx/src/stacktrace/stacktrace_entry.cpp

41

Thanks, good catch!

[philnik]

• Fix CI
• Add more tests

[philnik]

• Remove non-ASCII characters

[philnik]

• Try to fix CI

[philnik]

• Add DWARF 5 32bit (not actually working)

[tschuett]

libcxx/src/stacktrace/stacktrace_entry.cpp

36

I do not know about the libcxx coding style, but LLVM prefers static over functions in anonymous namespaces. I believe there are quite a few functions that you could make static.

[philnik]

• DWARF works now for simple programs