Import libc++ 10.0.1 release.

1 files changed, 295 insertions, 0 deletions

diff --git a/gnu/llvm/libcxx/src/system_error.cpp b/gnu/llvm/libcxx/src/system_error.cpp
new file mode 100644
index 00000000000..9ddf7bcbe03
--- /dev/null
+++ b/gnu/llvm/libcxx/src/system_error.cpp
@@ -0,0 +1,295 @@
+//===---------------------- system_error.cpp ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "__config"
+
+#include "system_error"
+
+#include "include/config_elast.h"
+#include "cerrno"
+#include "cstring"
+#include "cstdio"
+#include "cstdlib"
+#include "string"
+#include "string.h"
+#include "__debug"
+
+#if defined(__ANDROID__)
+#include <android/api-level.h>
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// class error_category
+
+#if defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS)
+error_category::error_category() _NOEXCEPT
+{
+}
+#endif
+
+error_category::~error_category() _NOEXCEPT
+{
+}
+
+error_condition
+error_category::default_error_condition(int ev) const _NOEXCEPT
+{
+    return error_condition(ev, *this);
+}
+
+bool
+error_category::equivalent(int code, const error_condition& condition) const _NOEXCEPT
+{
+    return default_error_condition(code) == condition;
+}
+
+bool
+error_category::equivalent(const error_code& code, int condition) const _NOEXCEPT
+{
+    return *this == code.category() && code.value() == condition;
+}
+
+#if !defined(_LIBCPP_HAS_NO_THREADS)
+namespace {
+
+//  GLIBC also uses 1024 as the maximum buffer size internally.
+constexpr size_t strerror_buff_size = 1024;
+
+string do_strerror_r(int ev);
+
+#if defined(_LIBCPP_MSVCRT_LIKE)
+string do_strerror_r(int ev) {
+  char buffer[strerror_buff_size];
+  if (::strerror_s(buffer, strerror_buff_size, ev) == 0)
+    return string(buffer);
+  std::snprintf(buffer, strerror_buff_size, "unknown error %d", ev);
+  return string(buffer);
+}
+#else
+
+// Only one of the two following functions will be used, depending on
+// the return type of strerror_r:
+
+// For the GNU variant, a char* return value:
+__attribute__((unused)) const char *
+handle_strerror_r_return(char *strerror_return, char *buffer) {
+  // GNU always returns a string pointer in its return value. The
+  // string might point to either the input buffer, or a static
+  // buffer, but we don't care which.
+  return strerror_return;
+}
+
+// For the POSIX variant: an int return value.
+__attribute__((unused)) const char *
+handle_strerror_r_return(int strerror_return, char *buffer) {
+  // The POSIX variant either:
+  // - fills in the provided buffer and returns 0
+  // - returns a positive error value, or
+  // - returns -1 and fills in errno with an error value.
+  if (strerror_return == 0)
+    return buffer;
+
+  // Only handle EINVAL. Other errors abort.
+  int new_errno = strerror_return == -1 ? errno : strerror_return;
+  if (new_errno == EINVAL)
+    return "";
+
+  _LIBCPP_ASSERT(new_errno == ERANGE, "unexpected error from ::strerror_r");
+  // FIXME maybe? 'strerror_buff_size' is likely to exceed the
+  // maximum error size so ERANGE shouldn't be returned.
+  std::abort();
+}
+
+// This function handles both GNU and POSIX variants, dispatching to
+// one of the two above functions.
+string do_strerror_r(int ev) {
+    char buffer[strerror_buff_size];
+    // Preserve errno around the call. (The C++ standard requires that
+    // system_error functions not modify errno).
+    const int old_errno = errno;
+    const char *error_message = handle_strerror_r_return(
+        ::strerror_r(ev, buffer, strerror_buff_size), buffer);
+    // If we didn't get any message, print one now.
+    if (!error_message[0]) {
+      std::snprintf(buffer, strerror_buff_size, "Unknown error %d", ev);
+      error_message = buffer;
+    }
+    errno = old_errno;
+    return string(error_message);
+}
+#endif
+} // end namespace
+#endif
+
+string
+__do_message::message(int ev) const
+{
+#if defined(_LIBCPP_HAS_NO_THREADS)
+    return string(::strerror(ev));
+#else
+    return do_strerror_r(ev);
+#endif
+}
+
+class _LIBCPP_HIDDEN __generic_error_category
+    : public __do_message
+{
+public:
+    virtual const char* name() const _NOEXCEPT;
+    virtual string message(int ev) const;
+};
+
+const char*
+__generic_error_category::name() const _NOEXCEPT
+{
+    return "generic";
+}
+
+string
+__generic_error_category::message(int ev) const
+{
+#ifdef _LIBCPP_ELAST
+    if (ev > _LIBCPP_ELAST)
+      return string("unspecified generic_category error");
+#endif  // _LIBCPP_ELAST
+    return __do_message::message(ev);
+}
+
+const error_category&
+generic_category() _NOEXCEPT
+{
+    static __generic_error_category s;
+    return s;
+}
+
+class _LIBCPP_HIDDEN __system_error_category
+    : public __do_message
+{
+public:
+    virtual const char* name() const _NOEXCEPT;
+    virtual string message(int ev) const;
+    virtual error_condition default_error_condition(int ev) const _NOEXCEPT;
+};
+
+const char*
+__system_error_category::name() const _NOEXCEPT
+{
+    return "system";
+}
+
+string
+__system_error_category::message(int ev) const
+{
+#ifdef _LIBCPP_ELAST
+    if (ev > _LIBCPP_ELAST)
+      return string("unspecified system_category error");
+#endif  // _LIBCPP_ELAST
+    return __do_message::message(ev);
+}
+
+error_condition
+__system_error_category::default_error_condition(int ev) const _NOEXCEPT
+{
+#ifdef _LIBCPP_ELAST
+    if (ev > _LIBCPP_ELAST)
+      return error_condition(ev, system_category());
+#endif  // _LIBCPP_ELAST
+    return error_condition(ev, generic_category());
+}
+
+const error_category&
+system_category() _NOEXCEPT
+{
+    static __system_error_category s;
+    return s;
+}
+
+// error_condition
+
+string
+error_condition::message() const
+{
+    return __cat_->message(__val_);
+}
+
+// error_code
+
+string
+error_code::message() const
+{
+    return __cat_->message(__val_);
+}
+
+// system_error
+
+string
+system_error::__init(const error_code& ec, string what_arg)
+{
+    if (ec)
+    {
+        if (!what_arg.empty())
+            what_arg += ": ";
+        what_arg += ec.message();
+    }
+    return what_arg;
+}
+
+system_error::system_error(error_code ec, const string& what_arg)
+    : runtime_error(__init(ec, what_arg)),
+      __ec_(ec)
+{
+}
+
+system_error::system_error(error_code ec, const char* what_arg)
+    : runtime_error(__init(ec, what_arg)),
+      __ec_(ec)
+{
+}
+
+system_error::system_error(error_code ec)
+    : runtime_error(__init(ec, "")),
+      __ec_(ec)
+{
+}
+
+system_error::system_error(int ev, const error_category& ecat, const string& what_arg)
+    : runtime_error(__init(error_code(ev, ecat), what_arg)),
+      __ec_(error_code(ev, ecat))
+{
+}
+
+system_error::system_error(int ev, const error_category& ecat, const char* what_arg)
+    : runtime_error(__init(error_code(ev, ecat), what_arg)),
+      __ec_(error_code(ev, ecat))
+{
+}
+
+system_error::system_error(int ev, const error_category& ecat)
+    : runtime_error(__init(error_code(ev, ecat), "")),
+      __ec_(error_code(ev, ecat))
+{
+}
+
+system_error::~system_error() _NOEXCEPT
+{
+}
+
+void
+__throw_system_error(int ev, const char* what_arg)
+{
+#ifndef _LIBCPP_NO_EXCEPTIONS
+    throw system_error(error_code(ev, system_category()), what_arg);
+#else
+    (void)ev;
+    (void)what_arg;
+    _VSTD::abort();
+#endif
+}
+
+_LIBCPP_END_NAMESPACE_STD