mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
8b33204f37
* 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.
103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//
|
|
// This file implements the storage for the "Caught Exception Stack"
|
|
// https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html#cxx-exc-stack
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "third_party/libcxxabi/cxa_exception.h"
|
|
|
|
#include "third_party/libcxx/__threading_support"
|
|
|
|
#if defined(_LIBCXXABI_HAS_NO_THREADS)
|
|
|
|
namespace __cxxabiv1 {
|
|
extern "C" {
|
|
static __cxa_eh_globals eh_globals;
|
|
__cxa_eh_globals *__cxa_get_globals() { return &eh_globals; }
|
|
__cxa_eh_globals *__cxa_get_globals_fast() { return &eh_globals; }
|
|
} // extern "C"
|
|
} // namespace __cxxabiv1
|
|
|
|
#elif defined(HAS_THREAD_LOCAL)
|
|
|
|
namespace __cxxabiv1 {
|
|
namespace {
|
|
__cxa_eh_globals *__globals() {
|
|
static thread_local __cxa_eh_globals eh_globals;
|
|
return &eh_globals;
|
|
}
|
|
} // namespace
|
|
|
|
extern "C" {
|
|
__cxa_eh_globals *__cxa_get_globals() { return __globals(); }
|
|
__cxa_eh_globals *__cxa_get_globals_fast() { return __globals(); }
|
|
} // extern "C"
|
|
} // namespace __cxxabiv1
|
|
|
|
#else
|
|
|
|
#include "third_party/libcxxabi/abort_message.h"
|
|
#include "third_party/libcxxabi/fallback_malloc.h"
|
|
|
|
#if defined(__ELF__) && defined(_LIBCXXABI_LINK_PTHREAD_LIB)
|
|
#pragma comment(lib, "pthread")
|
|
#endif
|
|
|
|
// In general, we treat all threading errors as fatal.
|
|
// We cannot call std::terminate() because that will in turn
|
|
// call __cxa_get_globals() and cause infinite recursion.
|
|
|
|
namespace __cxxabiv1 {
|
|
namespace {
|
|
std::__libcpp_tls_key key_;
|
|
std::__libcpp_exec_once_flag flag_ = _LIBCPP_EXEC_ONCE_INITIALIZER;
|
|
|
|
void _LIBCPP_TLS_DESTRUCTOR_CC destruct_(void *p) {
|
|
__free_with_fallback(p);
|
|
if (0 != std::__libcpp_tls_set(key_, NULL))
|
|
abort_message("cannot zero out thread value for __cxa_get_globals()");
|
|
}
|
|
|
|
void construct_() {
|
|
if (0 != std::__libcpp_tls_create(&key_, destruct_))
|
|
abort_message("cannot create thread specific key for __cxa_get_globals()");
|
|
}
|
|
} // namespace
|
|
|
|
extern "C" {
|
|
__cxa_eh_globals *__cxa_get_globals() {
|
|
// Try to get the globals for this thread
|
|
__cxa_eh_globals *retVal = __cxa_get_globals_fast();
|
|
|
|
// If this is the first time we've been asked for these globals, create them
|
|
if (NULL == retVal) {
|
|
retVal = static_cast<__cxa_eh_globals*>(
|
|
__calloc_with_fallback(1, sizeof(__cxa_eh_globals)));
|
|
if (NULL == retVal)
|
|
abort_message("cannot allocate __cxa_eh_globals");
|
|
if (0 != std::__libcpp_tls_set(key_, retVal))
|
|
abort_message("std::__libcpp_tls_set failure in __cxa_get_globals()");
|
|
}
|
|
return retVal;
|
|
}
|
|
|
|
// Note that this implementation will reliably return NULL if not
|
|
// preceded by a call to __cxa_get_globals(). This is an extension
|
|
// to the Itanium ABI and is taken advantage of in several places in
|
|
// libc++abi.
|
|
__cxa_eh_globals *__cxa_get_globals_fast() {
|
|
// First time through, create the key.
|
|
if (0 != std::__libcpp_execute_once(&flag_, construct_))
|
|
abort_message("execute once failure in __cxa_get_globals_fast()");
|
|
return static_cast<__cxa_eh_globals*>(std::__libcpp_tls_get(key_));
|
|
}
|
|
} // extern "C"
|
|
} // namespace __cxxabiv1
|
|
|
|
#endif
|