mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224953 91177308-0d34-0410-b5e6-96231b3b80d8
622 lines
18 KiB
C++
622 lines
18 KiB
C++
//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- 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 Unix specific implementation of the Path API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include <limits.h>
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#include <stdio.h>
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#if HAVE_DIRENT_H
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# include <dirent.h>
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# define NAMLEN(dirent) strlen((dirent)->d_name)
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#else
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# define dirent direct
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# define NAMLEN(dirent) (dirent)->d_namlen
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# if HAVE_SYS_NDIR_H
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# include <sys/ndir.h>
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# endif
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# if HAVE_SYS_DIR_H
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# include <sys/dir.h>
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# endif
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# if HAVE_NDIR_H
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# include <ndir.h>
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# endif
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#endif
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#ifdef __APPLE__
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#include <mach-o/dyld.h>
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#endif
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// Both stdio.h and cstdio are included via different pathes and
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// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
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// either.
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#undef ferror
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#undef feof
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// For GNU Hurd
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#if defined(__GNU__) && !defined(PATH_MAX)
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# define PATH_MAX 4096
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#endif
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using namespace llvm;
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namespace llvm {
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namespace sys {
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namespace fs {
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#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
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defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
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defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
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static int
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test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
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{
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struct stat sb;
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char fullpath[PATH_MAX];
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snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
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if (realpath(fullpath, ret) == NULL)
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return (1);
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if (stat(fullpath, &sb) != 0)
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return (1);
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return (0);
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}
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static char *
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getprogpath(char ret[PATH_MAX], const char *bin)
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{
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char *pv, *s, *t;
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/* First approach: absolute path. */
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if (bin[0] == '/') {
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if (test_dir(ret, "/", bin) == 0)
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return (ret);
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return (NULL);
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}
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/* Second approach: relative path. */
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if (strchr(bin, '/') != NULL) {
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char cwd[PATH_MAX];
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if (getcwd(cwd, PATH_MAX) == NULL)
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return (NULL);
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if (test_dir(ret, cwd, bin) == 0)
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return (ret);
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return (NULL);
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}
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/* Third approach: $PATH */
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if ((pv = getenv("PATH")) == NULL)
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return (NULL);
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s = pv = strdup(pv);
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if (pv == NULL)
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return (NULL);
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while ((t = strsep(&s, ":")) != NULL) {
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if (test_dir(ret, t, bin) == 0) {
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free(pv);
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return (ret);
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}
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}
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free(pv);
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return (NULL);
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}
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#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
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/// GetMainExecutable - Return the path to the main executable, given the
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/// value of argv[0] from program startup.
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std::string getMainExecutable(const char *argv0, void *MainAddr) {
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#if defined(__APPLE__)
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// On OS X the executable path is saved to the stack by dyld. Reading it
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// from there is much faster than calling dladdr, especially for large
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// binaries with symbols.
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char exe_path[MAXPATHLEN];
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uint32_t size = sizeof(exe_path);
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if (_NSGetExecutablePath(exe_path, &size) == 0) {
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char link_path[MAXPATHLEN];
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if (realpath(exe_path, link_path))
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return link_path;
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}
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#elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
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defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
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defined(__FreeBSD_kernel__)
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char exe_path[PATH_MAX];
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if (getprogpath(exe_path, argv0) != NULL)
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return exe_path;
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#elif defined(__linux__) || defined(__CYGWIN__)
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char exe_path[MAXPATHLEN];
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StringRef aPath("/proc/self/exe");
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if (sys::fs::exists(aPath)) {
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// /proc is not always mounted under Linux (chroot for example).
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ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
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if (len >= 0)
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return std::string(exe_path, len);
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} else {
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// Fall back to the classical detection.
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if (getprogpath(exe_path, argv0) != NULL)
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return exe_path;
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}
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#elif defined(HAVE_DLFCN_H)
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// Use dladdr to get executable path if available.
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Dl_info DLInfo;
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int err = dladdr(MainAddr, &DLInfo);
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if (err == 0)
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return "";
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// If the filename is a symlink, we need to resolve and return the location of
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// the actual executable.
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char link_path[MAXPATHLEN];
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if (realpath(DLInfo.dli_fname, link_path))
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return link_path;
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#else
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#error GetMainExecutable is not implemented on this host yet.
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#endif
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return "";
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}
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TimeValue file_status::getLastModificationTime() const {
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TimeValue Ret;
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Ret.fromEpochTime(fs_st_mtime);
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return Ret;
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}
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UniqueID file_status::getUniqueID() const {
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return UniqueID(fs_st_dev, fs_st_ino);
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}
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std::error_code current_path(SmallVectorImpl<char> &result) {
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result.clear();
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const char *pwd = ::getenv("PWD");
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llvm::sys::fs::file_status PWDStatus, DotStatus;
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if (pwd && llvm::sys::path::is_absolute(pwd) &&
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!llvm::sys::fs::status(pwd, PWDStatus) &&
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!llvm::sys::fs::status(".", DotStatus) &&
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PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
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result.append(pwd, pwd + strlen(pwd));
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return std::error_code();
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}
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#ifdef MAXPATHLEN
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result.reserve(MAXPATHLEN);
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#else
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// For GNU Hurd
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result.reserve(1024);
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#endif
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while (true) {
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if (::getcwd(result.data(), result.capacity()) == nullptr) {
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// See if there was a real error.
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if (errno != ENOMEM)
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return std::error_code(errno, std::generic_category());
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// Otherwise there just wasn't enough space.
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result.reserve(result.capacity() * 2);
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} else
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break;
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}
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result.set_size(strlen(result.data()));
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return std::error_code();
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}
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std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
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if (errno != EEXIST || !IgnoreExisting)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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// Note that we are using symbolic link because hard links are not supported by
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// all filesystems (SMB doesn't).
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std::error_code create_link(const Twine &to, const Twine &from) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::symlink(t.begin(), f.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
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SmallString<128> path_storage;
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StringRef p = path.toNullTerminatedStringRef(path_storage);
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struct stat buf;
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if (lstat(p.begin(), &buf) != 0) {
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if (errno != ENOENT || !IgnoreNonExisting)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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// Note: this check catches strange situations. In all cases, LLVM should
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// only be involved in the creation and deletion of regular files. This
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// check ensures that what we're trying to erase is a regular file. It
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// effectively prevents LLVM from erasing things like /dev/null, any block
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// special file, or other things that aren't "regular" files.
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if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
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return make_error_code(errc::operation_not_permitted);
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if (::remove(p.begin()) == -1) {
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if (errno != ENOENT || !IgnoreNonExisting)
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return std::error_code(errno, std::generic_category());
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}
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return std::error_code();
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}
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std::error_code rename(const Twine &from, const Twine &to) {
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// Get arguments.
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SmallString<128> from_storage;
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SmallString<128> to_storage;
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StringRef f = from.toNullTerminatedStringRef(from_storage);
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StringRef t = to.toNullTerminatedStringRef(to_storage);
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if (::rename(f.begin(), t.begin()) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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std::error_code resize_file(int FD, uint64_t Size) {
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if (::ftruncate(FD, Size) == -1)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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static int convertAccessMode(AccessMode Mode) {
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switch (Mode) {
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case AccessMode::Exist:
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return F_OK;
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case AccessMode::Write:
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return W_OK;
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case AccessMode::Execute:
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return R_OK | X_OK; // scripts also need R_OK.
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}
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llvm_unreachable("invalid enum");
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}
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std::error_code access(const Twine &Path, AccessMode Mode) {
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SmallString<128> PathStorage;
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StringRef P = Path.toNullTerminatedStringRef(PathStorage);
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if (::access(P.begin(), convertAccessMode(Mode)) == -1)
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return std::error_code(errno, std::generic_category());
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if (Mode == AccessMode::Execute) {
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// Don't say that directories are executable.
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struct stat buf;
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if (0 != stat(P.begin(), &buf))
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return errc::permission_denied;
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if (!S_ISREG(buf.st_mode))
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return errc::permission_denied;
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}
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return std::error_code();
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}
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bool equivalent(file_status A, file_status B) {
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assert(status_known(A) && status_known(B));
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return A.fs_st_dev == B.fs_st_dev &&
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A.fs_st_ino == B.fs_st_ino;
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}
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std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
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file_status fsA, fsB;
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if (std::error_code ec = status(A, fsA))
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return ec;
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if (std::error_code ec = status(B, fsB))
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return ec;
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result = equivalent(fsA, fsB);
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return std::error_code();
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}
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static std::error_code fillStatus(int StatRet, const struct stat &Status,
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file_status &Result) {
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if (StatRet != 0) {
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std::error_code ec(errno, std::generic_category());
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if (ec == errc::no_such_file_or_directory)
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Result = file_status(file_type::file_not_found);
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else
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Result = file_status(file_type::status_error);
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return ec;
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}
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file_type Type = file_type::type_unknown;
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if (S_ISDIR(Status.st_mode))
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Type = file_type::directory_file;
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else if (S_ISREG(Status.st_mode))
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Type = file_type::regular_file;
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else if (S_ISBLK(Status.st_mode))
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Type = file_type::block_file;
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else if (S_ISCHR(Status.st_mode))
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Type = file_type::character_file;
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else if (S_ISFIFO(Status.st_mode))
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Type = file_type::fifo_file;
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else if (S_ISSOCK(Status.st_mode))
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Type = file_type::socket_file;
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perms Perms = static_cast<perms>(Status.st_mode);
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Result =
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file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_mtime,
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Status.st_uid, Status.st_gid, Status.st_size);
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return std::error_code();
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}
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std::error_code status(const Twine &Path, file_status &Result) {
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SmallString<128> PathStorage;
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StringRef P = Path.toNullTerminatedStringRef(PathStorage);
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struct stat Status;
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int StatRet = ::stat(P.begin(), &Status);
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return fillStatus(StatRet, Status, Result);
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}
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std::error_code status(int FD, file_status &Result) {
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struct stat Status;
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int StatRet = ::fstat(FD, &Status);
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return fillStatus(StatRet, Status, Result);
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}
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std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
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#if defined(HAVE_FUTIMENS)
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timespec Times[2];
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Times[0].tv_sec = Time.toEpochTime();
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Times[0].tv_nsec = 0;
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Times[1] = Times[0];
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if (::futimens(FD, Times))
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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#elif defined(HAVE_FUTIMES)
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timeval Times[2];
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Times[0].tv_sec = Time.toEpochTime();
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Times[0].tv_usec = 0;
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Times[1] = Times[0];
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if (::futimes(FD, Times))
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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#else
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#warning Missing futimes() and futimens()
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return make_error_code(errc::function_not_supported);
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#endif
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}
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std::error_code mapped_file_region::init(int FD, uint64_t Offset,
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mapmode Mode) {
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assert(Size != 0);
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int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
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int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
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Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
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if (Mapping == MAP_FAILED)
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return std::error_code(errno, std::generic_category());
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return std::error_code();
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}
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mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
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uint64_t offset, std::error_code &ec)
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: Size(length), Mapping() {
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// Make sure that the requested size fits within SIZE_T.
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if (length > std::numeric_limits<size_t>::max()) {
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ec = make_error_code(errc::invalid_argument);
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return;
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}
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ec = init(fd, offset, mode);
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if (ec)
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Mapping = nullptr;
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}
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mapped_file_region::~mapped_file_region() {
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if (Mapping)
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::munmap(Mapping, Size);
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}
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uint64_t mapped_file_region::size() const {
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assert(Mapping && "Mapping failed but used anyway!");
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return Size;
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}
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char *mapped_file_region::data() const {
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assert(Mapping && "Mapping failed but used anyway!");
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return reinterpret_cast<char*>(Mapping);
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}
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const char *mapped_file_region::const_data() const {
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assert(Mapping && "Mapping failed but used anyway!");
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return reinterpret_cast<const char*>(Mapping);
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}
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int mapped_file_region::alignment() {
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return Process::getPageSize();
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}
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std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
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StringRef path){
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SmallString<128> path_null(path);
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DIR *directory = ::opendir(path_null.c_str());
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if (!directory)
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return std::error_code(errno, std::generic_category());
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it.IterationHandle = reinterpret_cast<intptr_t>(directory);
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// Add something for replace_filename to replace.
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path::append(path_null, ".");
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it.CurrentEntry = directory_entry(path_null.str());
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return directory_iterator_increment(it);
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}
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std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
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if (it.IterationHandle)
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::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
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it.IterationHandle = 0;
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it.CurrentEntry = directory_entry();
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return std::error_code();
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}
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std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
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errno = 0;
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dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
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if (cur_dir == nullptr && errno != 0) {
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return std::error_code(errno, std::generic_category());
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} else if (cur_dir != nullptr) {
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StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
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if ((name.size() == 1 && name[0] == '.') ||
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(name.size() == 2 && name[0] == '.' && name[1] == '.'))
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return directory_iterator_increment(it);
|
|
it.CurrentEntry.replace_filename(name);
|
|
} else
|
|
return directory_iterator_destruct(it);
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
|
|
SmallString<128> Storage;
|
|
StringRef P = Name.toNullTerminatedStringRef(Storage);
|
|
while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) {
|
|
if (errno != EINTR)
|
|
return std::error_code(errno, std::generic_category());
|
|
}
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
|
|
sys::fs::OpenFlags Flags, unsigned Mode) {
|
|
// Verify that we don't have both "append" and "excl".
|
|
assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
|
|
"Cannot specify both 'excl' and 'append' file creation flags!");
|
|
|
|
int OpenFlags = O_CREAT;
|
|
|
|
if (Flags & F_RW)
|
|
OpenFlags |= O_RDWR;
|
|
else
|
|
OpenFlags |= O_WRONLY;
|
|
|
|
if (Flags & F_Append)
|
|
OpenFlags |= O_APPEND;
|
|
else
|
|
OpenFlags |= O_TRUNC;
|
|
|
|
if (Flags & F_Excl)
|
|
OpenFlags |= O_EXCL;
|
|
|
|
SmallString<128> Storage;
|
|
StringRef P = Name.toNullTerminatedStringRef(Storage);
|
|
while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
|
|
if (errno != EINTR)
|
|
return std::error_code(errno, std::generic_category());
|
|
}
|
|
return std::error_code();
|
|
}
|
|
|
|
} // end namespace fs
|
|
|
|
namespace path {
|
|
|
|
bool home_directory(SmallVectorImpl<char> &result) {
|
|
if (char *RequestedDir = getenv("HOME")) {
|
|
result.clear();
|
|
result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const char *getEnvTempDir() {
|
|
// Check whether the temporary directory is specified by an environment
|
|
// variable.
|
|
const char *EnvironmentVariables[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
|
|
for (const char *Env : EnvironmentVariables) {
|
|
if (const char *Dir = std::getenv(Env))
|
|
return Dir;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
static const char *getDefaultTempDir(bool ErasedOnReboot) {
|
|
#ifdef P_tmpdir
|
|
if ((bool)P_tmpdir)
|
|
return P_tmpdir;
|
|
#endif
|
|
|
|
if (ErasedOnReboot)
|
|
return "/tmp";
|
|
return "/var/tmp";
|
|
}
|
|
|
|
void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
|
|
Result.clear();
|
|
|
|
if (ErasedOnReboot) {
|
|
// There is no env variable for the cache directory.
|
|
if (const char *RequestedDir = getEnvTempDir()) {
|
|
Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
return;
|
|
}
|
|
}
|
|
|
|
#if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
|
|
// On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
|
|
// macros defined in <unistd.h> on darwin >= 9
|
|
int ConfName = ErasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
|
|
: _CS_DARWIN_USER_CACHE_DIR;
|
|
size_t ConfLen = confstr(ConfName, nullptr, 0);
|
|
if (ConfLen > 0) {
|
|
do {
|
|
Result.resize(ConfLen);
|
|
ConfLen = confstr(ConfName, Result.data(), Result.size());
|
|
} while (ConfLen > 0 && ConfLen != Result.size());
|
|
|
|
if (ConfLen > 0) {
|
|
assert(Result.back() == 0);
|
|
Result.pop_back();
|
|
return;
|
|
}
|
|
|
|
Result.clear();
|
|
}
|
|
#endif
|
|
|
|
const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
|
|
Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
|
|
}
|
|
|
|
} // end namespace path
|
|
|
|
} // end namespace sys
|
|
} // end namespace llvm
|