mirror of
https://github.com/matrix-construct/construct
synced 2024-06-02 10:08:56 +02:00
129 lines
2.5 KiB
C++
129 lines
2.5 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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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#ifndef __GNUC__
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#pragma STDC FENV_ACCESS on
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#endif
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std::fexcept_t
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ircd::fpe::set(const ushort &flags)
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{
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std::fexcept_t theirs;
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syscall(std::fesetexceptflag, &theirs, flags);
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return theirs;
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}
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void
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ircd::fpe::throw_errors(const ushort &flags)
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{
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if(!flags)
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return;
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thread_local char buf[128];
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throw std::domain_error
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{
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reflect(buf, flags)
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};
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}
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ircd::string_view
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ircd::fpe::reflect(const mutable_buffer &buf,
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const ushort &flags)
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{
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window_buffer wb{buf};
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const auto append{[&wb](const auto &flag)
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{
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wb([&flag](const mutable_buffer &buf)
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{
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return strlcpy(buf, reflect(flag));
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});
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}};
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for(size_t i(0); i < sizeof(flags) * 8; ++i)
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if(flags & (1 << i))
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append(1 << i);
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return wb.completed();
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}
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ircd::string_view
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ircd::fpe::reflect(const ushort &flag)
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{
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switch(flag)
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{
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case 0: return "";
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case FE_INVALID: return "INVALID";
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case FE_DIVBYZERO: return "DIVBYZERO";
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case FE_UNDERFLOW: return "UNDERFLOW";
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case FE_OVERFLOW: return "OVERFLOW";
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case FE_INEXACT: return "INEXACT";
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}
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return "?????";
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}
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ircd::string_view
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ircd::fpe::reflect_sicode(const int &code)
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{
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switch(code)
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{
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#if defined(HAVE_SIGNAL_H) && defined(FPE_INTDIV)
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case FPE_INTDIV: return "INTDIV";
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case FPE_INTOVF: return "INTOVF";
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case FPE_FLTDIV: return "FLTDIV";
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case FPE_FLTOVF: return "FLTOVF";
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case FPE_FLTUND: return "FLTUND";
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case FPE_FLTRES: return "FLTRES";
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case FPE_FLTINV: return "FLTINV";
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case FPE_FLTSUB: return "FLTSUB";
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#endif // HAVE_SIGNAL_H
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}
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return "?????";
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}
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//
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// errors_handle
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//
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ircd::fpe::errors_handle::errors_handle()
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{
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syscall(std::fegetexceptflag, &theirs, FE_ALL_EXCEPT);
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clear_pending();
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}
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ircd::fpe::errors_handle::~errors_handle()
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noexcept(false)
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{
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const auto pending(this->pending());
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syscall(std::fesetexceptflag, &theirs, FE_ALL_EXCEPT);
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throw_errors(pending);
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}
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void
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ircd::fpe::errors_handle::clear_pending()
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{
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syscall(std::feclearexcept, FE_ALL_EXCEPT);
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}
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void
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ircd::fpe::errors_handle::throw_pending()
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const
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{
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throw_errors(pending());
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}
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ushort
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ircd::fpe::errors_handle::pending()
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const
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{
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return std::fetestexcept(FE_ALL_EXCEPT);
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}
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