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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.
This commit is contained in:
Trung Nguyen
GitHub
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8b33204f37
53 changed files with 14606 additions and 372 deletions
164
third_party/libcxxabi/cxa_exception.h
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third_party/libcxxabi/cxa_exception.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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// This file implements the "Exception Handling APIs"
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// https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
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//
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//===----------------------------------------------------------------------===//
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#ifndef _CXA_EXCEPTION_H
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#define _CXA_EXCEPTION_H
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#include "third_party/libcxx/exception" // for std::unexpected_handler and std::terminate_handler
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#include "third_party/libcxxabi/include/cxxabi.h"
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#include "third_party/libunwind/include/unwind.h"
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namespace __cxxabiv1 {
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static const uint64_t kOurExceptionClass = 0x434C4E47432B2B00; // CLNGC++\0
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static const uint64_t kOurDependentExceptionClass = 0x434C4E47432B2B01; // CLNGC++\1
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static const uint64_t get_vendor_and_language = 0xFFFFFFFFFFFFFF00; // mask for CLNGC++
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_LIBCXXABI_HIDDEN uint64_t __getExceptionClass (const _Unwind_Exception*);
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_LIBCXXABI_HIDDEN void __setExceptionClass ( _Unwind_Exception*, uint64_t);
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_LIBCXXABI_HIDDEN bool __isOurExceptionClass(const _Unwind_Exception*);
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struct _LIBCXXABI_HIDDEN __cxa_exception {
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#if defined(__LP64__) || defined(_WIN64) || defined(_LIBCXXABI_ARM_EHABI)
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// Now _Unwind_Exception is marked with __attribute__((aligned)),
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// which implies __cxa_exception is also aligned. Insert padding
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// in the beginning of the struct, rather than before unwindHeader.
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void *reserve;
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// This is a new field to support C++11 exception_ptr.
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// For binary compatibility it is at the start of this
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// struct which is prepended to the object thrown in
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// __cxa_allocate_exception.
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size_t referenceCount;
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#endif
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// Manage the exception object itself.
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std::type_info *exceptionType;
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void (_LIBCXXABI_DTOR_FUNC *exceptionDestructor)(void *);
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std::unexpected_handler unexpectedHandler;
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std::terminate_handler terminateHandler;
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__cxa_exception *nextException;
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int handlerCount;
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#if defined(_LIBCXXABI_ARM_EHABI)
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__cxa_exception* nextPropagatingException;
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int propagationCount;
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#else
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int handlerSwitchValue;
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const unsigned char *actionRecord;
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const unsigned char *languageSpecificData;
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void *catchTemp;
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void *adjustedPtr;
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#endif
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#if !defined(__LP64__) && !defined(_WIN64) && !defined(_LIBCXXABI_ARM_EHABI)
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// This is a new field to support C++11 exception_ptr.
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// For binary compatibility it is placed where the compiler
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// previously added padding to 64-bit align unwindHeader.
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size_t referenceCount;
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#endif
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_Unwind_Exception unwindHeader;
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};
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// http://sourcery.mentor.com/archives/cxx-abi-dev/msg01924.html
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// The layout of this structure MUST match the layout of __cxa_exception, with
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// primaryException instead of referenceCount.
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struct _LIBCXXABI_HIDDEN __cxa_dependent_exception {
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#if defined(__LP64__) || defined(_WIN64) || defined(_LIBCXXABI_ARM_EHABI)
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void* reserve; // padding.
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void* primaryException;
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#endif
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std::type_info *exceptionType;
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void (_LIBCXXABI_DTOR_FUNC *exceptionDestructor)(void *);
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std::unexpected_handler unexpectedHandler;
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std::terminate_handler terminateHandler;
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__cxa_exception *nextException;
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int handlerCount;
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#if defined(_LIBCXXABI_ARM_EHABI)
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__cxa_exception* nextPropagatingException;
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int propagationCount;
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#else
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int handlerSwitchValue;
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const unsigned char *actionRecord;
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const unsigned char *languageSpecificData;
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void * catchTemp;
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void *adjustedPtr;
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#endif
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#if !defined(__LP64__) && !defined(_WIN64) && !defined(_LIBCXXABI_ARM_EHABI)
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void* primaryException;
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#endif
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_Unwind_Exception unwindHeader;
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};
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// Verify the negative offsets of different fields.
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static_assert(sizeof(_Unwind_Exception) +
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offsetof(__cxa_exception, unwindHeader) ==
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sizeof(__cxa_exception),
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"unwindHeader has wrong negative offsets");
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static_assert(sizeof(_Unwind_Exception) +
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offsetof(__cxa_dependent_exception, unwindHeader) ==
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sizeof(__cxa_dependent_exception),
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"unwindHeader has wrong negative offsets");
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#if defined(_LIBCXXABI_ARM_EHABI)
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static_assert(offsetof(__cxa_exception, propagationCount) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_exception),
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"propagationCount has wrong negative offset");
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static_assert(offsetof(__cxa_dependent_exception, propagationCount) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_dependent_exception),
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"propagationCount has wrong negative offset");
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#elif defined(__LP64__) || defined(_WIN64)
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static_assert(offsetof(__cxa_exception, adjustedPtr) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_exception),
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"adjustedPtr has wrong negative offset");
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static_assert(offsetof(__cxa_dependent_exception, adjustedPtr) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_dependent_exception),
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"adjustedPtr has wrong negative offset");
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#else
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static_assert(offsetof(__cxa_exception, referenceCount) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_exception),
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"referenceCount has wrong negative offset");
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static_assert(offsetof(__cxa_dependent_exception, primaryException) +
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sizeof(_Unwind_Exception) + sizeof(void*) ==
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sizeof(__cxa_dependent_exception),
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"primaryException has wrong negative offset");
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#endif
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struct _LIBCXXABI_HIDDEN __cxa_eh_globals {
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__cxa_exception * caughtExceptions;
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unsigned int uncaughtExceptions;
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#if defined(_LIBCXXABI_ARM_EHABI)
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__cxa_exception* propagatingExceptions;
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#endif
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};
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extern "C" _LIBCXXABI_FUNC_VIS __cxa_eh_globals * __cxa_get_globals ();
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extern "C" _LIBCXXABI_FUNC_VIS __cxa_eh_globals * __cxa_get_globals_fast ();
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extern "C" _LIBCXXABI_FUNC_VIS void * __cxa_allocate_dependent_exception ();
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extern "C" _LIBCXXABI_FUNC_VIS void __cxa_free_dependent_exception (void * dependent_exception);
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} // namespace __cxxabiv1
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#endif // _CXA_EXCEPTION_H
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