310 lines
8.2 KiB
C++
310 lines
8.2 KiB
C++
//===------------------------ exception.cpp -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <stdlib.h>
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#include <stdio.h>
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#include "exception"
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#include "new"
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#if defined(__APPLE__) && !defined(LIBCXXRT)
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#include <cxxabi.h>
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using namespace __cxxabiv1;
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#define HAVE_DEPENDENT_EH_ABI 1
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#ifndef _LIBCPPABI_VERSION
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using namespace __cxxabiapple;
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// On Darwin, there are two STL shared libraries and a lower level ABI
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// shared library. The globals holding the current terminate handler and
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// current unexpected handler are in the ABI library.
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#define __terminate_handler __cxxabiapple::__cxa_terminate_handler
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#define __unexpected_handler __cxxabiapple::__cxa_unexpected_handler
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#endif // _LIBCPPABI_VERSION
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#elif defined(LIBCXXRT) || defined(LIBCXX_BUILDING_LIBCXXABI)
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#include <cxxabi.h>
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using namespace __cxxabiv1;
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#if defined(LIBCXXRT) || defined(_LIBCPPABI_VERSION)
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#define HAVE_DEPENDENT_EH_ABI 1
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#endif
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#elif !defined(__GLIBCXX__) // defined(LIBCXX_BUILDING_LIBCXXABI)
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static std::terminate_handler __terminate_handler;
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static std::unexpected_handler __unexpected_handler;
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#endif // defined(LIBCXX_BUILDING_LIBCXXABI)
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namespace std
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{
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#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
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// libcxxrt provides implementations of these functions itself.
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unexpected_handler
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set_unexpected(unexpected_handler func) _NOEXCEPT
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{
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return __sync_lock_test_and_set(&__unexpected_handler, func);
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}
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unexpected_handler
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get_unexpected() _NOEXCEPT
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{
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return __sync_fetch_and_add(&__unexpected_handler, (unexpected_handler)0);
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}
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_LIBCPP_NORETURN
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void
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unexpected()
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{
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(*get_unexpected())();
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// unexpected handler should not return
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terminate();
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}
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terminate_handler
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set_terminate(terminate_handler func) _NOEXCEPT
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{
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return __sync_lock_test_and_set(&__terminate_handler, func);
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}
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terminate_handler
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get_terminate() _NOEXCEPT
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{
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return __sync_fetch_and_add(&__terminate_handler, (terminate_handler)0);
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}
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#ifndef __EMSCRIPTEN__ // We provide this in JS
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_LIBCPP_NORETURN
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void
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terminate() _NOEXCEPT
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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try
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{
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#endif // _LIBCPP_NO_EXCEPTIONS
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(*get_terminate())();
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// handler should not return
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fprintf(stderr, "terminate_handler unexpectedly returned\n");
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::abort();
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#ifndef _LIBCPP_NO_EXCEPTIONS
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}
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catch (...)
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{
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// handler should not throw exception
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fprintf(stderr, "terminate_handler unexpectedly threw an exception\n");
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::abort();
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}
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#endif // _LIBCPP_NO_EXCEPTIONS
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}
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#endif // !__EMSCRIPTEN__
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#endif // !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION)
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#if !defined(LIBCXXRT) && !defined(__GLIBCXX__) && !defined(__EMSCRIPTEN__)
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bool uncaught_exception() _NOEXCEPT { return uncaught_exceptions() > 0; }
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int uncaught_exceptions() _NOEXCEPT
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{
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#if defined(__APPLE__) || defined(_LIBCPPABI_VERSION)
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// on Darwin, there is a helper function so __cxa_get_globals is private
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# if _LIBCPPABI_VERSION > 1101
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return __cxa_uncaught_exceptions();
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# else
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return __cxa_uncaught_exception() ? 1 : 0;
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# endif
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#else // __APPLE__
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING("uncaught_exceptions not yet implemented")
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# else
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# warning uncaught_exception not yet implemented
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# endif
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fprintf(stderr, "uncaught_exceptions not yet implemented\n");
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::abort();
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#endif // __APPLE__
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}
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#ifndef _LIBCPPABI_VERSION
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exception::~exception() _NOEXCEPT
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{
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}
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const char* exception::what() const _NOEXCEPT
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{
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return "std::exception";
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}
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#endif // _LIBCPPABI_VERSION
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#endif //LIBCXXRT
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#if !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
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bad_exception::~bad_exception() _NOEXCEPT
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{
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}
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const char* bad_exception::what() const _NOEXCEPT
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{
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return "std::bad_exception";
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}
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#endif
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#if defined(__GLIBCXX__)
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// libsupc++ does not implement the dependent EH ABI and the functionality
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// it uses to implement std::exception_ptr (which it declares as an alias of
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// std::__exception_ptr::exception_ptr) is not directly exported to clients. So
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// we have little choice but to hijack std::__exception_ptr::exception_ptr's
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// (which fortunately has the same layout as our std::exception_ptr) copy
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// constructor, assignment operator and destructor (which are part of its
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// stable ABI), and its rethrow_exception(std::__exception_ptr::exception_ptr)
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// function.
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namespace __exception_ptr
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{
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struct exception_ptr
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{
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void* __ptr_;
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exception_ptr(const exception_ptr&) _NOEXCEPT;
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exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
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~exception_ptr() _NOEXCEPT;
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};
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}
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_LIBCPP_NORETURN void rethrow_exception(__exception_ptr::exception_ptr);
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#endif
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exception_ptr::~exception_ptr() _NOEXCEPT
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{
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#if HAVE_DEPENDENT_EH_ABI
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__cxa_decrement_exception_refcount(__ptr_);
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#elif defined(__GLIBCXX__)
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reinterpret_cast<__exception_ptr::exception_ptr*>(this)->~exception_ptr();
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#else
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING("exception_ptr not yet implemented")
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# else
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# warning exception_ptr not yet implemented
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# endif
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fprintf(stderr, "exception_ptr not yet implemented\n");
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::abort();
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#endif
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}
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exception_ptr::exception_ptr(const exception_ptr& other) _NOEXCEPT
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: __ptr_(other.__ptr_)
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{
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#if HAVE_DEPENDENT_EH_ABI
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__cxa_increment_exception_refcount(__ptr_);
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#elif defined(__GLIBCXX__)
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new (reinterpret_cast<void*>(this)) __exception_ptr::exception_ptr(
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reinterpret_cast<const __exception_ptr::exception_ptr&>(other));
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#else
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING("exception_ptr not yet implemented")
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# else
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# warning exception_ptr not yet implemented
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# endif
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fprintf(stderr, "exception_ptr not yet implemented\n");
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::abort();
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#endif
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}
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exception_ptr& exception_ptr::operator=(const exception_ptr& other) _NOEXCEPT
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{
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#if HAVE_DEPENDENT_EH_ABI
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if (__ptr_ != other.__ptr_)
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{
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__cxa_increment_exception_refcount(other.__ptr_);
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__cxa_decrement_exception_refcount(__ptr_);
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__ptr_ = other.__ptr_;
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}
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return *this;
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#elif defined(__GLIBCXX__)
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*reinterpret_cast<__exception_ptr::exception_ptr*>(this) =
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reinterpret_cast<const __exception_ptr::exception_ptr&>(other);
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return *this;
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#else
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING("exception_ptr not yet implemented")
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# else
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# warning exception_ptr not yet implemented
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# endif
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fprintf(stderr, "exception_ptr not yet implemented\n");
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::abort();
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#endif
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}
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nested_exception::nested_exception() _NOEXCEPT
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: __ptr_(current_exception())
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{
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}
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#if !defined(__GLIBCXX__)
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nested_exception::~nested_exception() _NOEXCEPT
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{
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}
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#endif
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_LIBCPP_NORETURN
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void
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nested_exception::rethrow_nested() const
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{
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if (__ptr_ == nullptr)
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terminate();
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rethrow_exception(__ptr_);
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}
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#if !defined(__GLIBCXX__)
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exception_ptr current_exception() _NOEXCEPT
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{
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#if HAVE_DEPENDENT_EH_ABI
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// be nicer if there was a constructor that took a ptr, then
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// this whole function would be just:
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// return exception_ptr(__cxa_current_primary_exception());
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exception_ptr ptr;
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ptr.__ptr_ = __cxa_current_primary_exception();
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return ptr;
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#else
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING( "exception_ptr not yet implemented" )
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# else
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# warning exception_ptr not yet implemented
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# endif
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fprintf(stderr, "exception_ptr not yet implemented\n");
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::abort();
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#endif
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}
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#endif // !__GLIBCXX__
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_LIBCPP_NORETURN
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void rethrow_exception(exception_ptr p)
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{
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#if HAVE_DEPENDENT_EH_ABI
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__cxa_rethrow_primary_exception(p.__ptr_);
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// if p.__ptr_ is NULL, above returns so we terminate
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terminate();
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#elif defined(__GLIBCXX__)
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rethrow_exception(reinterpret_cast<__exception_ptr::exception_ptr&>(p));
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#else
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# if defined(_MSC_VER) && ! defined(__clang__)
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_LIBCPP_WARNING("exception_ptr not yet implemented")
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# else
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# warning exception_ptr not yet implemented
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# endif
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fprintf(stderr, "exception_ptr not yet implemented\n");
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::abort();
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#endif
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}
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} // std
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