126 lines
2.8 KiB
C++
126 lines
2.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <RB_INC_CXXABI_H
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#include "ctx.h"
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#ifdef HAVE_CXXABI_H
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struct __cxxabiv1::__cxa_eh_globals
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{
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__cxa_exception *caughtExceptions;
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unsigned int uncaughtExceptions;
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};
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#endif
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//
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// exception_handler
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//
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ircd::ctx::exception_handler::exception_handler()
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noexcept
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:std::exception_ptr
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{
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// capture a shared reference of the current exception before the catch
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// block closes around it.
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std::current_exception()
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}
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{
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assert(bool(*this));
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// close the catch block.
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end_catch();
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// We don't yet support more levels of exceptions; after ending this
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// catch we can't still be in another one. This doesn't apply if we're
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// not on any ctx currently.
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assert(!current || !std::uncaught_exceptions());
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}
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//
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// util
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//
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#ifdef HAVE_CXXABI_H
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void
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ircd::ctx::exception_handler::end_catch()
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noexcept
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{
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// Only close the catch block if we're actually on an ircd::ctx. This
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// allows the same codepath with a ctx::exception_handler to be used
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// outside of the ircd::ctx system to not incur any unexpected or
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// potential issues with ending the catch manually.
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if(likely(current))
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__cxxabiv1::__cxa_end_catch();
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}
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#else
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#warning "CXXABI not available. Context switch inside catch block may be unsafe!"
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void
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ircd::ctx::exception_handler::end_catch()
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noexcept
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{
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}
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#endif
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#ifdef HAVE_CXXABI_H
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/// Get the uncaught exception count
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uint
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ircd::ctx::exception_handler::uncaught_exceptions()
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noexcept
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{
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const auto &cxa_globals
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{
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__cxxabiv1::__cxa_get_globals_fast()
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};
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assert(cxa_globals);
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return cxa_globals->uncaughtExceptions;
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}
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#else
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#warning "CXXABI not available. Context switch with uncaught exceptions may be unsafe!"
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uint
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ircd::ctx::exception_handler::uncaught_exceptions()
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noexcept
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{
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return std::uncaught_exceptions();
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}
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#endif
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#ifdef HAVE_CXXABI_H
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/// Set the uncaught exception count and return the previous value.
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uint
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ircd::ctx::exception_handler::uncaught_exceptions(const uint &val)
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noexcept
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{
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const auto &cxa_globals
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{
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__cxxabiv1::__cxa_get_globals_fast()
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};
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assert(cxa_globals);
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const auto ret
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{
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cxa_globals->uncaughtExceptions
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};
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assert(unsigned(ret) == unsigned(std::uncaught_exceptions()));
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cxa_globals->uncaughtExceptions = val;
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return ret;
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}
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#else
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#warning "CXXABI not available. Context switch with uncaught exceptions may be unsafe!"
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uint
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ircd::ctx::exception_handler::uncaught_exceptions(const uint &val)
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noexcept
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{
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assert(std::uncaught_exceptions() == val);
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return std::uncaught_exceptions();
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}
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#endif
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