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https://github.com/matrix-construct/construct
synced 2024-12-25 23:14:13 +01:00
ircd: Move fpe into util.
This commit is contained in:
Jason Volk
parent
108e90702e
commit
d8536ca9a9
6 changed files with 124 additions and 254 deletions
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@ -21,7 +21,6 @@
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#include "util/util.h"
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#include "exception.h"
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#include "run.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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@ -9,12 +9,11 @@
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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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#define HAVE_IRCD_UTIL_FPE_H
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namespace ircd::fpe
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namespace ircd::util::fpe
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{
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struct errors_handle;
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struct errors_throw;
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string_view reflect_sicode(const int &);
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string_view reflect(const ushort &flag);
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@ -25,7 +24,7 @@ namespace ircd::fpe
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/// Perform a single floating point operation at a time within the scope
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/// of fpe::errors_handle. After each operation check the floating point
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/// unit for an error status flag and throw a C++ exception.
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struct ircd::fpe::errors_handle
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struct ircd::util::fpe::errors_handle
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{
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fexcept_t theirs;
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@ -37,26 +36,3 @@ struct ircd::fpe::errors_handle
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errors_handle();
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~errors_handle() noexcept(false);
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};
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// We don't include <signal.h> in IRCd's standard include list. Instead that
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// is conditionally included in the appropriate .cc file. All we require here
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// is a forward declaration.
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extern "C"
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{
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struct sigaction;
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};
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/// Experimental floating-point error handling strategy which throws
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/// a C++ exception directly from the instruction which faulted the FPU.
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/// The stack will unwind directly from that point in the execution and
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/// control will be transferred to the appropriate catch block.
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struct ircd::fpe::errors_throw
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{
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custom_ptr<struct sigaction> their_sa;
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long their_fenabled;
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fexcept_t their_fe;
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public:
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errors_throw();
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~errors_throw() noexcept;
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};
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@ -57,6 +57,7 @@ namespace ircd
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#include "u2a.h"
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#include "pretty.h"
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#include "hash.h"
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#include "fpe.h"
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// Unsorted section
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namespace ircd {
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@ -105,7 +105,6 @@ 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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225
ircd/fpe.cc
225
ircd/fpe.cc
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@ -1,225 +0,0 @@
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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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#include <RB_INC_SIGNAL_H
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#ifndef __GNUC__
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#pragma STDC FENV_ACCESS on
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#endif
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//
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// errors_throw
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//
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#if defined(IRCD_USE_ASYNC_EXCEPTIONS) \
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&& defined(HAVE_SIGNAL_H) \
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&& defined(__GNUC__) \
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namespace ircd::fpe
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{
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/// The maximum number of sigactions we can maintain in our internal space.
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constexpr const size_t &SA_HEAP_MAX {48};
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/// This internal buffer is used for holding instances of struct sigaction
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/// as our external interface only has a forward-declaration and our class
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/// only maintains a pointer member for it.
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thread_local allocator::fixed<struct sigaction, SA_HEAP_MAX> sa_heap;
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extern "C" void ircd_fpe_handle_sigfpe(int signum, siginfo_t *const si, void *const uctx);
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}
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[[noreturn]] void
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ircd::fpe::ircd_fpe_handle_sigfpe(int signum,
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siginfo_t *const si,
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void *const uctx)
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{
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assert(si);
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assert(signum == SIGFPE);
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//TODO: due to __cxa_allocate_exception() this still malloc()'s :/
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// We can't have a floating point error within malloc() and family
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// or this signal will cleave it at an intermediate state and reenter.
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throw std::domain_error
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{
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reflect_sicode(si->si_code)
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};
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}
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//
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// errors_throw::errors_throw
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//
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ircd::fpe::errors_throw::errors_throw()
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:their_sa
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{
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new (sa_heap().allocate(1)) struct sigaction,
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[](auto *const ptr)
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{
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sa_heap().deallocate(ptr, 1);
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}
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}
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,their_fenabled
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{
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syscall(::fegetexcept)
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}
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{
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struct sigaction ours {0};
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ours.sa_sigaction = ircd_fpe_handle_sigfpe;
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ours.sa_flags |= SA_SIGINFO;
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ours.sa_flags |= SA_NODEFER; // Required to throw out of the handler
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syscall(std::fegetexceptflag, &their_fe, FE_ALL_EXCEPT);
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syscall(std::feclearexcept, FE_ALL_EXCEPT);
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syscall(::sigaction, SIGFPE, &ours, their_sa.get());
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syscall(::feenableexcept, FE_ALL_EXCEPT);
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}
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ircd::fpe::errors_throw::~errors_throw()
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noexcept
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{
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syscall(::fedisableexcept, FE_ALL_EXCEPT);
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syscall(::sigaction, SIGFPE, their_sa.get(), nullptr);
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syscall(::feenableexcept, their_fenabled);
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syscall(std::fesetexceptflag, &their_fe, FE_ALL_EXCEPT);
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}
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#else // IRCD_USE_ASYNC_EXCEPTIONS
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//
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// errors_throw::errors_throw
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//
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[[noreturn]]
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ircd::fpe::errors_throw::errors_throw()
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{
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throw panic
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{
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"Not implemented in this environment."
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};
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}
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[[noreturn]]
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ircd::fpe::errors_throw::~errors_throw()
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noexcept
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{
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assert(0);
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}
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#endif // IRCD_USE_ASYNC_EXCEPTIONS
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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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//
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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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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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#ifdef HAVE_SIGNAL_H
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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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120
ircd/util.cc
120
ircd/util.cc
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@ -23,6 +23,126 @@ ircd::util::size(std::ostream &s)
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return ret;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/fpe.h
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//
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#ifndef __GNUC__
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#pragma STDC FENV_ACCESS on
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#endif
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void
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ircd::util::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::util::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::util::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::util::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::util::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::util::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::util::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::util::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::util::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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#ifndef __GNUC__
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#pragma STDC FENV_ACCESS off
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#endif
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/env.h
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