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ircd::fpe: Add floating point environment suite; error scoping device.
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parent
c0de9b2e76
commit
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6 changed files with 138 additions and 0 deletions
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@ -583,6 +583,7 @@ RB_CHK_SYSHEADER(functional, [FUNCTIONAL])
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RB_CHK_SYSHEADER(algorithm, [ALGORITHM])
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RB_CHK_SYSHEADER(numeric, [NUMERIC])
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RB_CHK_SYSHEADER(cmath, [CMATH])
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RB_CHK_SYSHEADER(cfenv, [CFENV])
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RB_CHK_SYSHEADER(memory, [MEMORY])
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RB_CHK_SYSHEADER(exception, [EXCEPTION])
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RB_CHK_SYSHEADER(cerrno, [CERRNO])
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34
include/ircd/fpe.h
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34
include/ircd/fpe.h
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@ -0,0 +1,34 @@
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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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#pragma once
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#define HAVE_IRCD_FPE_H
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namespace ircd::fpe
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{
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struct errors_handle;
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string_view reflect(const ushort &flag);
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string_view reflect(const mutable_buffer &, const ushort &flags);
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void throw_errors(const ushort &flags);
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}
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struct ircd::fpe::errors_handle
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{
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fexcept_t theirs;
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public:
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ushort pending() const;
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void throw_pending() const;
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void clear_pending();
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errors_handle();
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~errors_handle() noexcept(false);
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};
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@ -36,6 +36,7 @@ namespace ircd
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#include "allocator.h"
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#include "util/util.h"
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#include "exception.h"
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#include "fpe.h"
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#include "demangle.h"
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#include "localee.h"
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#include "date.h"
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@ -59,6 +59,7 @@ extern "C"
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#include <RB_INC_ALGORITHM
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#include <RB_INC_NUMERIC
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#include <RB_INC_CMATH
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#include <RB_INC_CFENV
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#include <RB_INC_MEMORY
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#include <RB_INC_EXCEPTION
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#include <RB_INC_SYSTEM_ERROR
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@ -91,6 +91,7 @@ libircd_la_SOURCES = \
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allocator.cc \
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exception.cc \
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util.cc \
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fpe.cc \
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ios.cc \
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lexical.cc \
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tokens.cc \
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100
ircd/fpe.cc
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100
ircd/fpe.cc
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@ -0,0 +1,100 @@
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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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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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//
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// util
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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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