add libc++ and libc++abi sources
upstream: LLVM 10
This commit is contained in:
Andrew Kelley
295
lib/libcxx/src/system_error.cpp
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295
lib/libcxx/src/system_error.cpp
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//===---------------------- system_error.cpp ------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "__config"
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#include "system_error"
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#include "include/config_elast.h"
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#include "cerrno"
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#include "cstring"
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#include "cstdio"
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#include "cstdlib"
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#include "string"
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#include "string.h"
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#include "__debug"
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#if defined(__ANDROID__)
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#include <android/api-level.h>
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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// class error_category
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#if defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS)
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error_category::error_category() _NOEXCEPT
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{
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}
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#endif
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error_category::~error_category() _NOEXCEPT
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{
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}
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error_condition
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error_category::default_error_condition(int ev) const _NOEXCEPT
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{
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return error_condition(ev, *this);
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}
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bool
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error_category::equivalent(int code, const error_condition& condition) const _NOEXCEPT
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{
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return default_error_condition(code) == condition;
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}
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bool
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error_category::equivalent(const error_code& code, int condition) const _NOEXCEPT
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{
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return *this == code.category() && code.value() == condition;
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}
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#if !defined(_LIBCPP_HAS_NO_THREADS)
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namespace {
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// GLIBC also uses 1024 as the maximum buffer size internally.
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constexpr size_t strerror_buff_size = 1024;
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string do_strerror_r(int ev);
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#if defined(_LIBCPP_MSVCRT_LIKE)
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string do_strerror_r(int ev) {
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char buffer[strerror_buff_size];
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if (::strerror_s(buffer, strerror_buff_size, ev) == 0)
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return string(buffer);
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std::snprintf(buffer, strerror_buff_size, "unknown error %d", ev);
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return string(buffer);
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}
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#else
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// Only one of the two following functions will be used, depending on
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// the return type of strerror_r:
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// For the GNU variant, a char* return value:
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__attribute__((unused)) const char *
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handle_strerror_r_return(char *strerror_return, char *buffer) {
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// GNU always returns a string pointer in its return value. The
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// string might point to either the input buffer, or a static
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// buffer, but we don't care which.
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return strerror_return;
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}
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// For the POSIX variant: an int return value.
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__attribute__((unused)) const char *
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handle_strerror_r_return(int strerror_return, char *buffer) {
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// The POSIX variant either:
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// - fills in the provided buffer and returns 0
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// - returns a positive error value, or
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// - returns -1 and fills in errno with an error value.
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if (strerror_return == 0)
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return buffer;
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// Only handle EINVAL. Other errors abort.
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int new_errno = strerror_return == -1 ? errno : strerror_return;
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if (new_errno == EINVAL)
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return "";
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_LIBCPP_ASSERT(new_errno == ERANGE, "unexpected error from ::strerror_r");
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// FIXME maybe? 'strerror_buff_size' is likely to exceed the
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// maximum error size so ERANGE shouldn't be returned.
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std::abort();
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}
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// This function handles both GNU and POSIX variants, dispatching to
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// one of the two above functions.
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string do_strerror_r(int ev) {
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char buffer[strerror_buff_size];
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// Preserve errno around the call. (The C++ standard requires that
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// system_error functions not modify errno).
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const int old_errno = errno;
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const char *error_message = handle_strerror_r_return(
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::strerror_r(ev, buffer, strerror_buff_size), buffer);
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// If we didn't get any message, print one now.
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if (!error_message[0]) {
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std::snprintf(buffer, strerror_buff_size, "Unknown error %d", ev);
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error_message = buffer;
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}
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errno = old_errno;
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return string(error_message);
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}
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#endif
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} // end namespace
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#endif
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string
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__do_message::message(int ev) const
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{
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#if defined(_LIBCPP_HAS_NO_THREADS)
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return string(::strerror(ev));
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#else
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return do_strerror_r(ev);
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#endif
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}
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class _LIBCPP_HIDDEN __generic_error_category
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: public __do_message
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{
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public:
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virtual const char* name() const _NOEXCEPT;
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virtual string message(int ev) const;
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};
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const char*
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__generic_error_category::name() const _NOEXCEPT
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{
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return "generic";
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}
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string
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__generic_error_category::message(int ev) const
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{
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#ifdef _LIBCPP_ELAST
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if (ev > _LIBCPP_ELAST)
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return string("unspecified generic_category error");
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#endif // _LIBCPP_ELAST
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return __do_message::message(ev);
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}
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const error_category&
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generic_category() _NOEXCEPT
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{
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static __generic_error_category s;
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return s;
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}
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class _LIBCPP_HIDDEN __system_error_category
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: public __do_message
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{
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public:
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virtual const char* name() const _NOEXCEPT;
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virtual string message(int ev) const;
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virtual error_condition default_error_condition(int ev) const _NOEXCEPT;
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};
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const char*
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__system_error_category::name() const _NOEXCEPT
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{
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return "system";
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}
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string
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__system_error_category::message(int ev) const
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{
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#ifdef _LIBCPP_ELAST
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if (ev > _LIBCPP_ELAST)
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return string("unspecified system_category error");
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#endif // _LIBCPP_ELAST
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return __do_message::message(ev);
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}
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error_condition
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__system_error_category::default_error_condition(int ev) const _NOEXCEPT
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{
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#ifdef _LIBCPP_ELAST
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if (ev > _LIBCPP_ELAST)
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return error_condition(ev, system_category());
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#endif // _LIBCPP_ELAST
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return error_condition(ev, generic_category());
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}
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const error_category&
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system_category() _NOEXCEPT
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{
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static __system_error_category s;
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return s;
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}
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// error_condition
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string
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error_condition::message() const
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{
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return __cat_->message(__val_);
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}
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// error_code
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string
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error_code::message() const
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{
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return __cat_->message(__val_);
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}
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// system_error
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string
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system_error::__init(const error_code& ec, string what_arg)
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{
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if (ec)
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{
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if (!what_arg.empty())
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what_arg += ": ";
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what_arg += ec.message();
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}
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return what_arg;
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}
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system_error::system_error(error_code ec, const string& what_arg)
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: runtime_error(__init(ec, what_arg)),
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__ec_(ec)
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{
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}
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system_error::system_error(error_code ec, const char* what_arg)
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: runtime_error(__init(ec, what_arg)),
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__ec_(ec)
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{
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}
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system_error::system_error(error_code ec)
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: runtime_error(__init(ec, "")),
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__ec_(ec)
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{
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}
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system_error::system_error(int ev, const error_category& ecat, const string& what_arg)
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: runtime_error(__init(error_code(ev, ecat), what_arg)),
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__ec_(error_code(ev, ecat))
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{
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}
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system_error::system_error(int ev, const error_category& ecat, const char* what_arg)
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: runtime_error(__init(error_code(ev, ecat), what_arg)),
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__ec_(error_code(ev, ecat))
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{
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}
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system_error::system_error(int ev, const error_category& ecat)
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: runtime_error(__init(error_code(ev, ecat), "")),
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__ec_(error_code(ev, ecat))
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{
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}
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system_error::~system_error() _NOEXCEPT
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{
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}
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void
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__throw_system_error(int ev, const char* what_arg)
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw system_error(error_code(ev, system_category()), what_arg);
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#else
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(void)ev;
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(void)what_arg;
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_VSTD::abort();
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#endif
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}
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_LIBCPP_END_NAMESPACE_STD
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