f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
//===- Errno.cpp - errno support --------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the errno wrappers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Errno.h"
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#include "llvm/Config/config.h" // Get autoconf configuration settings
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#include "llvm/Support/raw_ostream.h"
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#include <string.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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namespace llvm {
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namespace sys {
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#if HAVE_ERRNO_H
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std::string StrError() {
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return StrError(errno);
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}
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#endif // HAVE_ERRNO_H
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std::string StrError(int errnum) {
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const int MaxErrStrLen = 2000;
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char buffer[MaxErrStrLen];
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buffer[0] = '\0';
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std::string str;
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if (errnum == 0)
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return str;
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#ifdef HAVE_STRERROR_R
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// strerror_r is thread-safe.
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#if defined(__GLIBC__) && defined(_GNU_SOURCE)
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// glibc defines its own incompatible version of strerror_r
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// which may not use the buffer supplied.
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str = strerror_r(errnum, buffer, MaxErrStrLen - 1);
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#else
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strerror_r(errnum, buffer, MaxErrStrLen - 1);
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str = buffer;
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#endif
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#elif HAVE_DECL_STRERROR_S // "Windows Secure API"
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strerror_s(buffer, MaxErrStrLen - 1, errnum);
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str = buffer;
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#elif defined(HAVE_STRERROR)
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// Copy the thread un-safe result of strerror into
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// the buffer as fast as possible to minimize impact
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// of collision of strerror in multiple threads.
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str = strerror(errnum);
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#else
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// Strange that this system doesn't even have strerror
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// but, oh well, just use a generic message
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raw_string_ostream stream(str);
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stream << "Error #" << errnum;
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stream.flush();
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#endif
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return str;
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}
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} // namespace sys
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} // namespace llvm
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