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Add LLVM libcxxabi (#1063)

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* third_party: Add libcxxabi

Added libcxxabi from LLVM 17.0.6
The library implements the Itanium C++ exception handling ABI.

* third_party/libcxxabi: Enable __cxa_thread_atexit

Enable `__cxa_thread_atexit` from libcxxabi.
`__cxa_thread_atexit_impl` is still implemented by the cosmo libc.
The original `__cxa_thread_atexit` has been removed.

* third_party/libcxx: Build with exceptions

Build libcxx with exceptions enabled.

- Removed `_LIBCPP_NO_EXCEPTIONS` from `__config`.
- Switched the exception implementation to `libcxxabi`. These two files
are taken from the same `libcxx` version as mentioned in `README.cosmo`.
- Removed `new_handler_fallback` in favor of `libcxxabi` implementation.
- Enable `-fexceptions` and `-frtti` for `libcxx`.
- Removed `THIRD_PARTY_LIBCXX` dependency from `libcxxabi` and
`libunwind`. These libraries do not use any runtime `libcxx` functions,
just headers.

* libc: Remove remaining redundant cxa functions

- `__cxa_pure_virtual` in `libcxxabi` is also a stub similar to the
existing one.
- `__cxa_guard_*` from `libcxxabi` is used instead of the ones from
Android.

Now there should be no more duplicate implementations.
`__cxa_thread_atexit_impl`, `__cxa_atexit`, and related supporting
functions, are still left to other libraries as in `libcxxabi`.

`libcxxabi` is also now added to `cosmopolitan.a` to make up for the
removed functions.

Affected in-tree libraries (`third_party/double-conversion`) have been
updated.
This commit is contained in:
Trung Nguyen 2024-01-08 23:45:10 +07:00 • committed by GitHub
parent 94bab1618d
commit 8b33204f37
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53 changed files with 14606 additions and 372 deletions
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11
third_party/libcxx/exception.cc vendored
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@ -11,6 +11,11 @@
#include "third_party/libcxx/new"
#include "third_party/libcxx/typeinfo"
#include "third_party/libcxx/atomic_support.hh"
#include "third_party/libcxx/exception_fallback.hh"
#include "third_party/libcxx/exception_pointer_unimplemented.hh"
#if defined(LIBCXXRT) || defined(LIBCXX_BUILDING_LIBCXXABI)
#include "third_party/libcxxabi/include/cxxabi.h"
using namespace __cxxabiv1;
#define HAVE_DEPENDENT_EH_ABI 1
#endif
#include "third_party/libcxx/exception_libcxxabi.hh"
#include "third_party/libcxx/exception_pointer_cxxabi.hh"