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Add LLVM libcxxabi (#1063)
* 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.
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Trung Nguyen
GitHub
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53 changed files with 14606 additions and 372 deletions
177
third_party/libcxxabi/include/cxxabi.h
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third_party/libcxxabi/include/cxxabi.h
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef __CXXABI_H
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#define __CXXABI_H
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/*
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* This header provides the interface to the C++ ABI as defined at:
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* https://itanium-cxx-abi.github.io/cxx-abi/
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*/
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#include "libc/isystem/stddef.h"
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#include "libc/isystem/stdint.h"
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#include "third_party/libcxxabi/include/__cxxabi_config.h"
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#define _LIBCPPABI_VERSION 15000
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#define _LIBCXXABI_NORETURN __attribute__((noreturn))
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#define _LIBCXXABI_ALWAYS_COLD __attribute__((cold))
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#ifdef __cplusplus
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namespace std {
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#if defined(_WIN32)
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class _LIBCXXABI_TYPE_VIS type_info; // forward declaration
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#else
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class type_info; // forward declaration
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#endif
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}
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// runtime routines use C calling conventions, but are in __cxxabiv1 namespace
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namespace __cxxabiv1 {
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extern "C" {
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// 2.4.2 Allocating the Exception Object
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_allocate_exception(size_t thrown_size) throw();
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_free_exception(void *thrown_exception) throw();
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// 2.4.3 Throwing the Exception Object
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void
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__cxa_throw(void *thrown_exception, std::type_info *tinfo,
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void (_LIBCXXABI_DTOR_FUNC *dest)(void *));
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// 2.5.3 Exception Handlers
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_get_exception_ptr(void *exceptionObject) throw();
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_begin_catch(void *exceptionObject) throw();
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extern _LIBCXXABI_FUNC_VIS void __cxa_end_catch();
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#if defined(_LIBCXXABI_ARM_EHABI)
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extern _LIBCXXABI_FUNC_VIS bool
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__cxa_begin_cleanup(void *exceptionObject) throw();
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extern _LIBCXXABI_FUNC_VIS void __cxa_end_cleanup();
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#endif
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extern _LIBCXXABI_FUNC_VIS std::type_info *__cxa_current_exception_type();
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// 2.5.4 Rethrowing Exceptions
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_rethrow();
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// 2.6 Auxiliary Runtime APIs
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_bad_cast(void);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_bad_typeid(void);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void
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__cxa_throw_bad_array_new_length(void);
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// 3.2.6 Pure Virtual Function API
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_pure_virtual(void);
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// 3.2.7 Deleted Virtual Function API
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_deleted_virtual(void);
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// 3.3.2 One-time Construction API
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#if defined(_LIBCXXABI_GUARD_ABI_ARM)
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD int __cxa_guard_acquire(uint32_t *);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_release(uint32_t *);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_abort(uint32_t *);
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#else
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD int __cxa_guard_acquire(uint64_t *);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_release(uint64_t *);
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extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_ALWAYS_COLD void __cxa_guard_abort(uint64_t *);
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#endif
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// 3.3.3 Array Construction and Destruction API
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_vec_new(size_t element_count, size_t element_size, size_t padding_size,
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void (*constructor)(void *), void (*destructor)(void *));
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_vec_new2(size_t element_count, size_t element_size, size_t padding_size,
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void (*constructor)(void *), void (*destructor)(void *),
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void *(*alloc)(size_t), void (*dealloc)(void *));
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extern _LIBCXXABI_FUNC_VIS void *
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__cxa_vec_new3(size_t element_count, size_t element_size, size_t padding_size,
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void (*constructor)(void *), void (*destructor)(void *),
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void *(*alloc)(size_t), void (*dealloc)(void *, size_t));
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_vec_ctor(void *array_address, size_t element_count, size_t element_size,
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void (*constructor)(void *), void (*destructor)(void *));
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extern _LIBCXXABI_FUNC_VIS void __cxa_vec_dtor(void *array_address,
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size_t element_count,
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size_t element_size,
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void (*destructor)(void *));
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extern _LIBCXXABI_FUNC_VIS void __cxa_vec_cleanup(void *array_address,
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size_t element_count,
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size_t element_size,
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void (*destructor)(void *));
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extern _LIBCXXABI_FUNC_VIS void __cxa_vec_delete(void *array_address,
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size_t element_size,
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size_t padding_size,
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void (*destructor)(void *));
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_vec_delete2(void *array_address, size_t element_size, size_t padding_size,
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void (*destructor)(void *), void (*dealloc)(void *));
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_vec_delete3(void *__array_address, size_t element_size,
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size_t padding_size, void (*destructor)(void *),
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void (*dealloc)(void *, size_t));
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_vec_cctor(void *dest_array, void *src_array, size_t element_count,
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size_t element_size, void (*constructor)(void *, void *),
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void (*destructor)(void *));
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// 3.3.5.3 Runtime API
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// These functions are part of the C++ ABI, but they are not defined in libc++abi:
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// int __cxa_atexit(void (*)(void *), void *, void *);
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// void __cxa_finalize(void *);
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// 3.4 Demangler API
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extern _LIBCXXABI_FUNC_VIS char *__cxa_demangle(const char *mangled_name,
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char *output_buffer,
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size_t *length, int *status);
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// Apple additions to support C++ 0x exception_ptr class
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// These are primitives to wrap a smart pointer around an exception object
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extern _LIBCXXABI_FUNC_VIS void *__cxa_current_primary_exception() throw();
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_rethrow_primary_exception(void *primary_exception);
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_increment_exception_refcount(void *primary_exception) throw();
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extern _LIBCXXABI_FUNC_VIS void
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__cxa_decrement_exception_refcount(void *primary_exception) throw();
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// Apple extension to support std::uncaught_exception()
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extern _LIBCXXABI_FUNC_VIS bool __cxa_uncaught_exception() throw();
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extern _LIBCXXABI_FUNC_VIS unsigned int __cxa_uncaught_exceptions() throw();
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#if defined(__linux__) || defined(__Fuchsia__) || defined(__COSMOPOLITAN__)
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// Linux and Fuchsia TLS support. Not yet an official part of the Itanium ABI.
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// https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
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extern _LIBCXXABI_FUNC_VIS int __cxa_thread_atexit(void (*)(void *), void *,
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void *) throw();
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#endif
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} // extern "C"
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} // namespace __cxxabiv1
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namespace abi = __cxxabiv1;
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#endif // __cplusplus
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#endif // __CXXABI_H
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