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-rw-r--r--llvm/lib/Support/Unix/COM.inc26
-rw-r--r--llvm/lib/Support/Unix/DynamicLibrary.inc134
-rw-r--r--llvm/lib/Support/Unix/Host.inc84
-rw-r--r--llvm/lib/Support/Unix/Memory.inc268
-rw-r--r--llvm/lib/Support/Unix/Path.inc1213
-rw-r--r--llvm/lib/Support/Unix/Process.inc459
-rw-r--r--llvm/lib/Support/Unix/Program.inc500
-rw-r--r--llvm/lib/Support/Unix/README.txt16
-rw-r--r--llvm/lib/Support/Unix/Signals.inc632
-rw-r--r--llvm/lib/Support/Unix/ThreadLocal.inc70
-rw-r--r--llvm/lib/Support/Unix/Threading.inc258
-rw-r--r--llvm/lib/Support/Unix/Unix.h105
-rw-r--r--llvm/lib/Support/Unix/Watchdog.inc33
13 files changed, 3798 insertions, 0 deletions
diff --git a/llvm/lib/Support/Unix/COM.inc b/llvm/lib/Support/Unix/COM.inc
new file mode 100644
index 000000000000..03a690ac3766
--- /dev/null
+++ b/llvm/lib/Support/Unix/COM.inc
@@ -0,0 +1,26 @@
+//===- llvm/Support/Unix/COM.inc - Unix COM Implementation -----*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix portion of COM support.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+namespace llvm {
+namespace sys {
+
+InitializeCOMRAII::InitializeCOMRAII(COMThreadingMode Threading,
+ bool SpeedOverMemory) {}
+
+InitializeCOMRAII::~InitializeCOMRAII() {}
+}
+}
diff --git a/llvm/lib/Support/Unix/DynamicLibrary.inc b/llvm/lib/Support/Unix/DynamicLibrary.inc
new file mode 100644
index 000000000000..a2a379963de0
--- /dev/null
+++ b/llvm/lib/Support/Unix/DynamicLibrary.inc
@@ -0,0 +1,134 @@
+//===- Unix/DynamicLibrary.cpp - Unix DL Implementation ---------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the UNIX specific implementation of DynamicLibrary.
+//
+//===----------------------------------------------------------------------===//
+
+#if defined(HAVE_DLFCN_H) && defined(HAVE_DLOPEN)
+#include <dlfcn.h>
+
+DynamicLibrary::HandleSet::~HandleSet() {
+ // Close the libraries in reverse order.
+ for (void *Handle : llvm::reverse(Handles))
+ ::dlclose(Handle);
+ if (Process)
+ ::dlclose(Process);
+
+ // llvm_shutdown called, Return to default
+ DynamicLibrary::SearchOrder = DynamicLibrary::SO_Linker;
+}
+
+void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
+ void *Handle = ::dlopen(File, RTLD_LAZY|RTLD_GLOBAL);
+ if (!Handle) {
+ if (Err) *Err = ::dlerror();
+ return &DynamicLibrary::Invalid;
+ }
+
+#ifdef __CYGWIN__
+ // Cygwin searches symbols only in the main
+ // with the handle of dlopen(NULL, RTLD_GLOBAL).
+ if (!File)
+ Handle = RTLD_DEFAULT;
+#endif
+
+ return Handle;
+}
+
+void DynamicLibrary::HandleSet::DLClose(void *Handle) {
+ ::dlclose(Handle);
+}
+
+void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
+ return ::dlsym(Handle, Symbol);
+}
+
+#else // !HAVE_DLOPEN
+
+DynamicLibrary::HandleSet::~HandleSet() {}
+
+void *DynamicLibrary::HandleSet::DLOpen(const char *File, std::string *Err) {
+ if (Err) *Err = "dlopen() not supported on this platform";
+ return &Invalid;
+}
+
+void DynamicLibrary::HandleSet::DLClose(void *Handle) {
+}
+
+void *DynamicLibrary::HandleSet::DLSym(void *Handle, const char *Symbol) {
+ return nullptr;
+}
+
+#endif
+
+// Must declare the symbols in the global namespace.
+static void *DoSearch(const char* SymbolName) {
+#define EXPLICIT_SYMBOL(SYM) \
+ extern void *SYM; if (!strcmp(SymbolName, #SYM)) return (void*)&SYM
+
+ // If this is darwin, it has some funky issues, try to solve them here. Some
+ // important symbols are marked 'private external' which doesn't allow
+ // SearchForAddressOfSymbol to find them. As such, we special case them here,
+ // there is only a small handful of them.
+
+#ifdef __APPLE__
+ {
+ // __eprintf is sometimes used for assert() handling on x86.
+ //
+ // FIXME: Currently disabled when using Clang, as we don't always have our
+ // runtime support libraries available.
+#ifndef __clang__
+#ifdef __i386__
+ EXPLICIT_SYMBOL(__eprintf);
+#endif
+#endif
+ }
+#endif
+
+#ifdef __CYGWIN__
+ {
+ EXPLICIT_SYMBOL(_alloca);
+ EXPLICIT_SYMBOL(__main);
+ }
+#endif
+
+#undef EXPLICIT_SYMBOL
+
+// This macro returns the address of a well-known, explicit symbol
+#define EXPLICIT_SYMBOL(SYM) \
+ if (!strcmp(SymbolName, #SYM)) return &SYM
+
+// Under glibc we have a weird situation. The stderr/out/in symbols are both
+// macros and global variables because of standards requirements. So, we
+// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
+#if defined(__GLIBC__)
+ {
+ EXPLICIT_SYMBOL(stderr);
+ EXPLICIT_SYMBOL(stdout);
+ EXPLICIT_SYMBOL(stdin);
+ }
+#else
+ // For everything else, we want to check to make sure the symbol isn't defined
+ // as a macro before using EXPLICIT_SYMBOL.
+ {
+#ifndef stdin
+ EXPLICIT_SYMBOL(stdin);
+#endif
+#ifndef stdout
+ EXPLICIT_SYMBOL(stdout);
+#endif
+#ifndef stderr
+ EXPLICIT_SYMBOL(stderr);
+#endif
+ }
+#endif
+#undef EXPLICIT_SYMBOL
+
+ return nullptr;
+}
diff --git a/llvm/lib/Support/Unix/Host.inc b/llvm/lib/Support/Unix/Host.inc
new file mode 100644
index 000000000000..17d78dc18be7
--- /dev/null
+++ b/llvm/lib/Support/Unix/Host.inc
@@ -0,0 +1,84 @@
+//===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the UNIX Host support.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include <cctype>
+#include <string>
+#include <sys/utsname.h>
+
+using namespace llvm;
+
+static std::string getOSVersion() {
+ struct utsname info;
+
+ if (uname(&info))
+ return "";
+
+ return info.release;
+}
+
+static std::string updateTripleOSVersion(std::string TargetTripleString) {
+ // On darwin, we want to update the version to match that of the target.
+ std::string::size_type DarwinDashIdx = TargetTripleString.find("-darwin");
+ if (DarwinDashIdx != std::string::npos) {
+ TargetTripleString.resize(DarwinDashIdx + strlen("-darwin"));
+ TargetTripleString += getOSVersion();
+ return TargetTripleString;
+ }
+ std::string::size_type MacOSDashIdx = TargetTripleString.find("-macos");
+ if (MacOSDashIdx != std::string::npos) {
+ TargetTripleString.resize(MacOSDashIdx);
+ // Reset the OS to darwin as the OS version from `uname` doesn't use the
+ // macOS version scheme.
+ TargetTripleString += "-darwin";
+ TargetTripleString += getOSVersion();
+ }
+ // On AIX, the AIX version and release should be that of the current host
+ // unless if the version has already been specified.
+ if (Triple(LLVM_HOST_TRIPLE).getOS() == Triple::AIX) {
+ Triple TT(TargetTripleString);
+ if (TT.getOS() == Triple::AIX && !TT.getOSMajorVersion()) {
+ struct utsname name;
+ if (uname(&name) != -1) {
+ std::string NewOSName = Triple::getOSTypeName(Triple::AIX);
+ NewOSName += name.version;
+ NewOSName += '.';
+ NewOSName += name.release;
+ NewOSName += ".0.0";
+ TT.setOSName(NewOSName);
+ return TT.str();
+ }
+ }
+ }
+ return TargetTripleString;
+}
+
+std::string sys::getDefaultTargetTriple() {
+ std::string TargetTripleString =
+ updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
+
+ // Override the default target with an environment variable named by
+ // LLVM_TARGET_TRIPLE_ENV.
+#if defined(LLVM_TARGET_TRIPLE_ENV)
+ if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
+ TargetTripleString = EnvTriple;
+#endif
+
+ return TargetTripleString;
+}
diff --git a/llvm/lib/Support/Unix/Memory.inc b/llvm/lib/Support/Unix/Memory.inc
new file mode 100644
index 000000000000..05f8e32896fa
--- /dev/null
+++ b/llvm/lib/Support/Unix/Memory.inc
@@ -0,0 +1,268 @@
+//===- Unix/Memory.cpp - Generic UNIX System Configuration ------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines some functions for various memory management utilities.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Process.h"
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#ifdef __APPLE__
+#include <mach/mach.h>
+#endif
+
+#ifdef __Fuchsia__
+#include <zircon/syscalls.h>
+#endif
+
+#if defined(__mips__)
+# if defined(__OpenBSD__)
+# include <mips64/sysarch.h>
+# elif !defined(__FreeBSD__)
+# include <sys/cachectl.h>
+# endif
+#endif
+
+#if defined(__APPLE__)
+extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+#else
+extern "C" void __clear_cache(void *, void*);
+#endif
+
+namespace {
+
+int getPosixProtectionFlags(unsigned Flags) {
+ switch (Flags & llvm::sys::Memory::MF_RWE_MASK) {
+ case llvm::sys::Memory::MF_READ:
+ return PROT_READ;
+ case llvm::sys::Memory::MF_WRITE:
+ return PROT_WRITE;
+ case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_WRITE:
+ return PROT_READ | PROT_WRITE;
+ case llvm::sys::Memory::MF_READ|llvm::sys::Memory::MF_EXEC:
+ return PROT_READ | PROT_EXEC;
+ case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
+ llvm::sys::Memory::MF_EXEC:
+ return PROT_READ | PROT_WRITE | PROT_EXEC;
+ case llvm::sys::Memory::MF_EXEC:
+#if (defined(__FreeBSD__) || defined(__POWERPC__) || defined (__ppc__) || \
+ defined(_POWER) || defined(_ARCH_PPC))
+ // On PowerPC, having an executable page that has no read permission
+ // can have unintended consequences. The function InvalidateInstruction-
+ // Cache uses instructions dcbf and icbi, both of which are treated by
+ // the processor as loads. If the page has no read permissions,
+ // executing these instructions will result in a segmentation fault.
+ return PROT_READ | PROT_EXEC;
+#else
+ return PROT_EXEC;
+#endif
+ default:
+ llvm_unreachable("Illegal memory protection flag specified!");
+ }
+ // Provide a default return value as required by some compilers.
+ return PROT_NONE;
+}
+
+} // anonymous namespace
+
+namespace llvm {
+namespace sys {
+
+MemoryBlock
+Memory::allocateMappedMemory(size_t NumBytes,
+ const MemoryBlock *const NearBlock,
+ unsigned PFlags,
+ std::error_code &EC) {
+ EC = std::error_code();
+ if (NumBytes == 0)
+ return MemoryBlock();
+
+ // On platforms that have it, we can use MAP_ANON to get a memory-mapped
+ // page without file backing, but we need a fallback of opening /dev/zero
+ // for strictly POSIX platforms instead.
+ int fd;
+#if defined(MAP_ANON)
+ fd = -1;
+#else
+ fd = open("/dev/zero", O_RDWR);
+ if (fd == -1) {
+ EC = std::error_code(errno, std::generic_category());
+ return MemoryBlock();
+ }
+#endif
+
+ int MMFlags = MAP_PRIVATE;
+#if defined(MAP_ANON)
+ MMFlags |= MAP_ANON;
+#endif
+ int Protect = getPosixProtectionFlags(PFlags);
+
+#if defined(__NetBSD__) && defined(PROT_MPROTECT)
+ Protect |= PROT_MPROTECT(PROT_READ | PROT_WRITE | PROT_EXEC);
+#endif
+
+ // Use any near hint and the page size to set a page-aligned starting address
+ uintptr_t Start = NearBlock ? reinterpret_cast<uintptr_t>(NearBlock->base()) +
+ NearBlock->allocatedSize() : 0;
+ static const size_t PageSize = Process::getPageSizeEstimate();
+ const size_t NumPages = (NumBytes+PageSize-1)/PageSize;
+
+ if (Start && Start % PageSize)
+ Start += PageSize - Start % PageSize;
+
+ // FIXME: Handle huge page requests (MF_HUGE_HINT).
+ void *Addr = ::mmap(reinterpret_cast<void *>(Start), PageSize*NumPages, Protect,
+ MMFlags, fd, 0);
+ if (Addr == MAP_FAILED) {
+ if (NearBlock) { //Try again without a near hint
+#if !defined(MAP_ANON)
+ close(fd);
+#endif
+ return allocateMappedMemory(NumBytes, nullptr, PFlags, EC);
+ }
+
+ EC = std::error_code(errno, std::generic_category());
+#if !defined(MAP_ANON)
+ close(fd);
+#endif
+ return MemoryBlock();
+ }
+
+#if !defined(MAP_ANON)
+ close(fd);
+#endif
+
+ MemoryBlock Result;
+ Result.Address = Addr;
+ Result.AllocatedSize = PageSize*NumPages;
+ Result.Flags = PFlags;
+
+ // Rely on protectMappedMemory to invalidate instruction cache.
+ if (PFlags & MF_EXEC) {
+ EC = Memory::protectMappedMemory (Result, PFlags);
+ if (EC != std::error_code())
+ return MemoryBlock();
+ }
+
+ return Result;
+}
+
+std::error_code
+Memory::releaseMappedMemory(MemoryBlock &M) {
+ if (M.Address == nullptr || M.AllocatedSize == 0)
+ return std::error_code();
+
+ if (0 != ::munmap(M.Address, M.AllocatedSize))
+ return std::error_code(errno, std::generic_category());
+
+ M.Address = nullptr;
+ M.AllocatedSize = 0;
+
+ return std::error_code();
+}
+
+std::error_code
+Memory::protectMappedMemory(const MemoryBlock &M, unsigned Flags) {
+ static const Align PageSize = Align(Process::getPageSizeEstimate());
+ if (M.Address == nullptr || M.AllocatedSize == 0)
+ return std::error_code();
+
+ if (!Flags)
+ return std::error_code(EINVAL, std::generic_category());
+
+ int Protect = getPosixProtectionFlags(Flags);
+ uintptr_t Start = alignAddr((const uint8_t *)M.Address - PageSize.value() + 1, PageSize);
+ uintptr_t End = alignAddr((const uint8_t *)M.Address + M.AllocatedSize, PageSize);
+
+ bool InvalidateCache = (Flags & MF_EXEC);
+
+#if defined(__arm__) || defined(__aarch64__)
+ // Certain ARM implementations treat icache clear instruction as a memory read,
+ // and CPU segfaults on trying to clear cache on !PROT_READ page. Therefore we need
+ // to temporarily add PROT_READ for the sake of flushing the instruction caches.
+ if (InvalidateCache && !(Protect & PROT_READ)) {
+ int Result = ::mprotect((void *)Start, End - Start, Protect | PROT_READ);
+ if (Result != 0)
+ return std::error_code(errno, std::generic_category());
+
+ Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
+ InvalidateCache = false;
+ }
+#endif
+
+ int Result = ::mprotect((void *)Start, End - Start, Protect);
+
+ if (Result != 0)
+ return std::error_code(errno, std::generic_category());
+
+ if (InvalidateCache)
+ Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
+
+ return std::error_code();
+}
+
+/// InvalidateInstructionCache - Before the JIT can run a block of code
+/// that has been emitted it must invalidate the instruction cache on some
+/// platforms.
+void Memory::InvalidateInstructionCache(const void *Addr,
+ size_t Len) {
+
+// icache invalidation for PPC and ARM.
+#if defined(__APPLE__)
+
+# if (defined(__POWERPC__) || defined (__ppc__) || \
+ defined(_POWER) || defined(_ARCH_PPC) || defined(__arm__) || \
+ defined(__arm64__))
+ sys_icache_invalidate(const_cast<void *>(Addr), Len);
+# endif
+
+#elif defined(__Fuchsia__)
+
+ zx_status_t Status = zx_cache_flush(Addr, Len, ZX_CACHE_FLUSH_INSN);
+ assert(Status == ZX_OK && "cannot invalidate instruction cache");
+
+#else
+
+# if (defined(__POWERPC__) || defined (__ppc__) || \
+ defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
+ const size_t LineSize = 32;
+
+ const intptr_t Mask = ~(LineSize - 1);
+ const intptr_t StartLine = ((intptr_t) Addr) & Mask;
+ const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
+
+ for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+ asm volatile("dcbf 0, %0" : : "r"(Line));
+ asm volatile("sync");
+
+ for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
+ asm volatile("icbi 0, %0" : : "r"(Line));
+ asm volatile("isync");
+# elif (defined(__arm__) || defined(__aarch64__) || defined(__mips__)) && \
+ defined(__GNUC__)
+ // FIXME: Can we safely always call this for __GNUC__ everywhere?
+ const char *Start = static_cast<const char *>(Addr);
+ const char *End = Start + Len;
+ __clear_cache(const_cast<char *>(Start), const_cast<char *>(End));
+# endif
+
+#endif // end apple
+
+ ValgrindDiscardTranslations(Addr, Len);
+}
+
+} // namespace sys
+} // namespace llvm
diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc
new file mode 100644
index 000000000000..a617eca3566a
--- /dev/null
+++ b/llvm/lib/Support/Unix/Path.inc
@@ -0,0 +1,1213 @@
+//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix specific implementation of the Path API.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include <limits.h>
+#include <stdio.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#include <dirent.h>
+#include <pwd.h>
+
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#include <sys/attr.h>
+#include <copyfile.h>
+#elif defined(__DragonFly__)
+#include <sys/mount.h>
+#endif
+
+// Both stdio.h and cstdio are included via different paths and
+// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
+// either.
+#undef ferror
+#undef feof
+
+// For GNU Hurd
+#if defined(__GNU__) && !defined(PATH_MAX)
+# define PATH_MAX 4096
+# define MAXPATHLEN 4096
+#endif
+
+#include <sys/types.h>
+#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && \
+ !defined(__linux__) && !defined(__FreeBSD_kernel__) && !defined(_AIX)
+#include <sys/statvfs.h>
+#define STATVFS statvfs
+#define FSTATVFS fstatvfs
+#define STATVFS_F_FRSIZE(vfs) vfs.f_frsize
+#else
+#if defined(__OpenBSD__) || defined(__FreeBSD__)
+#include <sys/mount.h>
+#include <sys/param.h>
+#elif defined(__linux__)
+#if defined(HAVE_LINUX_MAGIC_H)
+#include <linux/magic.h>
+#else
+#if defined(HAVE_LINUX_NFS_FS_H)
+#include <linux/nfs_fs.h>
+#endif
+#if defined(HAVE_LINUX_SMB_H)
+#include <linux/smb.h>
+#endif
+#endif
+#include <sys/vfs.h>
+#elif defined(_AIX)
+#include <sys/statfs.h>
+
+// <sys/vmount.h> depends on `uint` to be a typedef from <sys/types.h> to
+// `uint_t`; however, <sys/types.h> does not always declare `uint`. We provide
+// the typedef prior to including <sys/vmount.h> to work around this issue.
+typedef uint_t uint;
+#include <sys/vmount.h>
+#else
+#include <sys/mount.h>
+#endif
+#define STATVFS statfs
+#define FSTATVFS fstatfs
+#define STATVFS_F_FRSIZE(vfs) static_cast<uint64_t>(vfs.f_bsize)
+#endif
+
+#if defined(__NetBSD__) || defined(__DragonFly__) || defined(__GNU__)
+#define STATVFS_F_FLAG(vfs) (vfs).f_flag
+#else
+#define STATVFS_F_FLAG(vfs) (vfs).f_flags
+#endif
+
+using namespace llvm;
+
+namespace llvm {
+namespace sys {
+namespace fs {
+
+const file_t kInvalidFile = -1;
+
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
+ defined(__minix) || defined(__FreeBSD_kernel__) || defined(__linux__) || \
+ defined(__CYGWIN__) || defined(__DragonFly__) || defined(_AIX) || defined(__GNU__)
+static int
+test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
+{
+ struct stat sb;
+ char fullpath[PATH_MAX];
+
+ int chars = snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
+ // We cannot write PATH_MAX characters because the string will be terminated
+ // with a null character. Fail if truncation happened.
+ if (chars >= PATH_MAX)
+ return 1;
+ if (!realpath(fullpath, ret))
+ return 1;
+ if (stat(fullpath, &sb) != 0)
+ return 1;
+
+ return 0;
+}
+
+static char *
+getprogpath(char ret[PATH_MAX], const char *bin)
+{
+ /* First approach: absolute path. */
+ if (bin[0] == '/') {
+ if (test_dir(ret, "/", bin) == 0)
+ return ret;
+ return nullptr;
+ }
+
+ /* Second approach: relative path. */
+ if (strchr(bin, '/')) {
+ char cwd[PATH_MAX];
+ if (!getcwd(cwd, PATH_MAX))
+ return nullptr;
+ if (test_dir(ret, cwd, bin) == 0)
+ return ret;
+ return nullptr;
+ }
+
+ /* Third approach: $PATH */
+ char *pv;
+ if ((pv = getenv("PATH")) == nullptr)
+ return nullptr;
+ char *s = strdup(pv);
+ if (!s)
+ return nullptr;
+ char *state;
+ for (char *t = strtok_r(s, ":", &state); t != nullptr;
+ t = strtok_r(nullptr, ":", &state)) {
+ if (test_dir(ret, t, bin) == 0) {
+ free(s);
+ return ret;
+ }
+ }
+ free(s);
+ return nullptr;
+}
+#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
+
+/// GetMainExecutable - Return the path to the main executable, given the
+/// value of argv[0] from program startup.
+std::string getMainExecutable(const char *argv0, void *MainAddr) {
+#if defined(__APPLE__)
+ // On OS X the executable path is saved to the stack by dyld. Reading it
+ // from there is much faster than calling dladdr, especially for large
+ // binaries with symbols.
+ char exe_path[MAXPATHLEN];
+ uint32_t size = sizeof(exe_path);
+ if (_NSGetExecutablePath(exe_path, &size) == 0) {
+ char link_path[MAXPATHLEN];
+ if (realpath(exe_path, link_path))
+ return link_path;
+ }
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
+ defined(__minix) || defined(__DragonFly__) || \
+ defined(__FreeBSD_kernel__) || defined(_AIX)
+ const char *curproc = "/proc/curproc/file";
+ char exe_path[PATH_MAX];
+ // /proc is not mounted by default under FreeBSD, but gives more accurate
+ // information than argv[0] when it is.
+ if (sys::fs::exists(curproc)) {
+ ssize_t len = readlink(curproc, exe_path, sizeof(exe_path));
+ if (len > 0) {
+ // Null terminate the string for realpath. readlink never null
+ // terminates its output.
+ len = std::min(len, ssize_t(sizeof(exe_path) - 1));
+ exe_path[len] = '\0';
+ return exe_path;
+ }
+ }
+ // If we don't have procfs mounted, fall back to argv[0]
+ if (getprogpath(exe_path, argv0) != NULL)
+ return exe_path;
+#elif defined(__linux__) || defined(__CYGWIN__)
+ char exe_path[MAXPATHLEN];
+ const char *aPath = "/proc/self/exe";
+ if (sys::fs::exists(aPath)) {
+ // /proc is not always mounted under Linux (chroot for example).
+ ssize_t len = readlink(aPath, exe_path, sizeof(exe_path));
+ if (len < 0)
+ return "";
+
+ // Null terminate the string for realpath. readlink never null
+ // terminates its output.
+ len = std::min(len, ssize_t(sizeof(exe_path) - 1));
+ exe_path[len] = '\0';
+
+ // On Linux, /proc/self/exe always looks through symlinks. However, on
+ // GNU/Hurd, /proc/self/exe is a symlink to the path that was used to start
+ // the program, and not the eventual binary file. Therefore, call realpath
+ // so this behaves the same on all platforms.
+#if _POSIX_VERSION >= 200112 || defined(__GLIBC__)
+ if (char *real_path = realpath(exe_path, NULL)) {
+ std::string ret = std::string(real_path);
+ free(real_path);
+ return ret;
+ }
+#else
+ char real_path[MAXPATHLEN];
+ if (realpath(exe_path, real_path))
+ return std::string(real_path);
+#endif
+ }
+ // Fall back to the classical detection.
+ if (getprogpath(exe_path, argv0))
+ return exe_path;
+#elif defined(HAVE_DLFCN_H) && defined(HAVE_DLADDR)
+ // Use dladdr to get executable path if available.
+ Dl_info DLInfo;
+ int err = dladdr(MainAddr, &DLInfo);
+ if (err == 0)
+ return "";
+
+ // If the filename is a symlink, we need to resolve and return the location of
+ // the actual executable.
+ char link_path[MAXPATHLEN];
+ if (realpath(DLInfo.dli_fname, link_path))
+ return link_path;
+#else
+#error GetMainExecutable is not implemented on this host yet.
+#endif
+ return "";
+}
+
+TimePoint<> basic_file_status::getLastAccessedTime() const {
+ return toTimePoint(fs_st_atime, fs_st_atime_nsec);
+}
+
+TimePoint<> basic_file_status::getLastModificationTime() const {
+ return toTimePoint(fs_st_mtime, fs_st_mtime_nsec);
+}
+
+UniqueID file_status::getUniqueID() const {
+ return UniqueID(fs_st_dev, fs_st_ino);
+}
+
+uint32_t file_status::getLinkCount() const {
+ return fs_st_nlinks;
+}
+
+ErrorOr<space_info> disk_space(const Twine &Path) {
+ struct STATVFS Vfs;
+ if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
+ return std::error_code(errno, std::generic_category());
+ auto FrSize = STATVFS_F_FRSIZE(Vfs);
+ space_info SpaceInfo;
+ SpaceInfo.capacity = static_cast<uint64_t>(Vfs.f_blocks) * FrSize;
+ SpaceInfo.free = static_cast<uint64_t>(Vfs.f_bfree) * FrSize;
+ SpaceInfo.available = static_cast<uint64_t>(Vfs.f_bavail) * FrSize;
+ return SpaceInfo;
+}
+
+std::error_code current_path(SmallVectorImpl<char> &result) {
+ result.clear();
+
+ const char *pwd = ::getenv("PWD");
+ llvm::sys::fs::file_status PWDStatus, DotStatus;
+ if (pwd && llvm::sys::path::is_absolute(pwd) &&
+ !llvm::sys::fs::status(pwd, PWDStatus) &&
+ !llvm::sys::fs::status(".", DotStatus) &&
+ PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
+ result.append(pwd, pwd + strlen(pwd));
+ return std::error_code();
+ }
+
+#ifdef MAXPATHLEN
+ result.reserve(MAXPATHLEN);
+#else
+// For GNU Hurd
+ result.reserve(1024);
+#endif
+
+ while (true) {
+ if (::getcwd(result.data(), result.capacity()) == nullptr) {
+ // See if there was a real error.
+ if (errno != ENOMEM)
+ return std::error_code(errno, std::generic_category());
+ // Otherwise there just wasn't enough space.
+ result.reserve(result.capacity() * 2);
+ } else
+ break;
+ }
+
+ result.set_size(strlen(result.data()));
+ return std::error_code();
+}
+
+std::error_code set_current_path(const Twine &path) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ if (::chdir(p.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code create_directory(const Twine &path, bool IgnoreExisting,
+ perms Perms) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ if (::mkdir(p.begin(), Perms) == -1) {
+ if (errno != EEXIST || !IgnoreExisting)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ return std::error_code();
+}
+
+// Note that we are using symbolic link because hard links are not supported by
+// all filesystems (SMB doesn't).
+std::error_code create_link(const Twine &to, const Twine &from) {
+ // Get arguments.
+ SmallString<128> from_storage;
+ SmallString<128> to_storage;
+ StringRef f = from.toNullTerminatedStringRef(from_storage);
+ StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+ if (::symlink(t.begin(), f.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code create_hard_link(const Twine &to, const Twine &from) {
+ // Get arguments.
+ SmallString<128> from_storage;
+ SmallString<128> to_storage;
+ StringRef f = from.toNullTerminatedStringRef(from_storage);
+ StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+ if (::link(t.begin(), f.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ struct stat buf;
+ if (lstat(p.begin(), &buf) != 0) {
+ if (errno != ENOENT || !IgnoreNonExisting)
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+ }
+
+ // Note: this check catches strange situations. In all cases, LLVM should
+ // only be involved in the creation and deletion of regular files. This
+ // check ensures that what we're trying to erase is a regular file. It
+ // effectively prevents LLVM from erasing things like /dev/null, any block
+ // special file, or other things that aren't "regular" files.
+ if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
+ return make_error_code(errc::operation_not_permitted);
+
+ if (::remove(p.begin()) == -1) {
+ if (errno != ENOENT || !IgnoreNonExisting)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ return std::error_code();
+}
+
+static bool is_local_impl(struct STATVFS &Vfs) {
+#if defined(__linux__) || defined(__GNU__)
+#ifndef NFS_SUPER_MAGIC
+#define NFS_SUPER_MAGIC 0x6969
+#endif
+#ifndef SMB_SUPER_MAGIC
+#define SMB_SUPER_MAGIC 0x517B
+#endif
+#ifndef CIFS_MAGIC_NUMBER
+#define CIFS_MAGIC_NUMBER 0xFF534D42
+#endif
+#ifdef __GNU__
+ switch ((uint32_t)Vfs.__f_type) {
+#else
+ switch ((uint32_t)Vfs.f_type) {
+#endif
+ case NFS_SUPER_MAGIC:
+ case SMB_SUPER_MAGIC:
+ case CIFS_MAGIC_NUMBER:
+ return false;
+ default:
+ return true;
+ }
+#elif defined(__CYGWIN__)
+ // Cygwin doesn't expose this information; would need to use Win32 API.
+ return false;
+#elif defined(__Fuchsia__)
+ // Fuchsia doesn't yet support remote filesystem mounts.
+ return true;
+#elif defined(__EMSCRIPTEN__)
+ // Emscripten doesn't currently support remote filesystem mounts.
+ return true;
+#elif defined(__HAIKU__)
+ // Haiku doesn't expose this information.
+ return false;
+#elif defined(__sun)
+ // statvfs::f_basetype contains a null-terminated FSType name of the mounted target
+ StringRef fstype(Vfs.f_basetype);
+ // NFS is the only non-local fstype??
+ return !fstype.equals("nfs");
+#elif defined(_AIX)
+ // Call mntctl; try more than twice in case of timing issues with a concurrent
+ // mount.
+ int Ret;
+ size_t BufSize = 2048u;
+ std::unique_ptr<char[]> Buf;
+ int Tries = 3;
+ while (Tries--) {
+ Buf = std::make_unique<char[]>(BufSize);
+ Ret = mntctl(MCTL_QUERY, BufSize, Buf.get());
+ if (Ret != 0)
+ break;
+ BufSize = *reinterpret_cast<unsigned int *>(Buf.get());
+ Buf.reset();
+ }
+
+ if (Ret == -1)
+ // There was an error; "remote" is the conservative answer.
+ return false;
+
+ // Look for the correct vmount entry.
+ char *CurObjPtr = Buf.get();
+ while (Ret--) {
+ struct vmount *Vp = reinterpret_cast<struct vmount *>(CurObjPtr);
+ static_assert(sizeof(Vfs.f_fsid) == sizeof(Vp->vmt_fsid),
+ "fsid length mismatch");
+ if (memcmp(&Vfs.f_fsid, &Vp->vmt_fsid, sizeof Vfs.f_fsid) == 0)
+ return (Vp->vmt_flags & MNT_REMOTE) == 0;
+
+ CurObjPtr += Vp->vmt_length;
+ }
+
+ // vmount entry not found; "remote" is the conservative answer.
+ return false;
+#else
+ return !!(STATVFS_F_FLAG(Vfs) & MNT_LOCAL);
+#endif
+}
+
+std::error_code is_local(const Twine &Path, bool &Result) {
+ struct STATVFS Vfs;
+ if (::STATVFS(const_cast<char *>(Path.str().c_str()), &Vfs))
+ return std::error_code(errno, std::generic_category());
+
+ Result = is_local_impl(Vfs);
+ return std::error_code();
+}
+
+std::error_code is_local(int FD, bool &Result) {
+ struct STATVFS Vfs;
+ if (::FSTATVFS(FD, &Vfs))
+ return std::error_code(errno, std::generic_category());
+
+ Result = is_local_impl(Vfs);
+ return std::error_code();
+}
+
+std::error_code rename(const Twine &from, const Twine &to) {
+ // Get arguments.
+ SmallString<128> from_storage;
+ SmallString<128> to_storage;
+ StringRef f = from.toNullTerminatedStringRef(from_storage);
+ StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+ if (::rename(f.begin(), t.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code resize_file(int FD, uint64_t Size) {
+#if defined(HAVE_POSIX_FALLOCATE)
+ // If we have posix_fallocate use it. Unlike ftruncate it always allocates
+ // space, so we get an error if the disk is full.
+ if (int Err = ::posix_fallocate(FD, 0, Size)) {
+#ifdef _AIX
+ constexpr int NotSupportedError = ENOTSUP;
+#else
+ constexpr int NotSupportedError = EOPNOTSUPP;
+#endif
+ if (Err != EINVAL && Err != NotSupportedError)
+ return std::error_code(Err, std::generic_category());
+ }
+#endif
+ // Use ftruncate as a fallback. It may or may not allocate space. At least on
+ // OS X with HFS+ it does.
+ if (::ftruncate(FD, Size) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+static int convertAccessMode(AccessMode Mode) {
+ switch (Mode) {
+ case AccessMode::Exist:
+ return F_OK;
+ case AccessMode::Write:
+ return W_OK;
+ case AccessMode::Execute:
+ return R_OK | X_OK; // scripts also need R_OK.
+ }
+ llvm_unreachable("invalid enum");
+}
+
+std::error_code access(const Twine &Path, AccessMode Mode) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+ if (::access(P.begin(), convertAccessMode(Mode)) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ if (Mode == AccessMode::Execute) {
+ // Don't say that directories are executable.
+ struct stat buf;
+ if (0 != stat(P.begin(), &buf))
+ return errc::permission_denied;
+ if (!S_ISREG(buf.st_mode))
+ return errc::permission_denied;
+ }
+
+ return std::error_code();
+}
+
+bool can_execute(const Twine &Path) {
+ return !access(Path, AccessMode::Execute);
+}
+
+bool equivalent(file_status A, file_status B) {
+ assert(status_known(A) && status_known(B));
+ return A.fs_st_dev == B.fs_st_dev &&
+ A.fs_st_ino == B.fs_st_ino;
+}
+
+std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+ file_status fsA, fsB;
+ if (std::error_code ec = status(A, fsA))
+ return ec;
+ if (std::error_code ec = status(B, fsB))
+ return ec;
+ result = equivalent(fsA, fsB);
+ return std::error_code();
+}
+
+static void expandTildeExpr(SmallVectorImpl<char> &Path) {
+ StringRef PathStr(Path.begin(), Path.size());
+ if (PathStr.empty() || !PathStr.startswith("~"))
+ return;
+
+ PathStr = PathStr.drop_front();
+ StringRef Expr =
+ PathStr.take_until([](char c) { return path::is_separator(c); });
+ StringRef Remainder = PathStr.substr(Expr.size() + 1);
+ SmallString<128> Storage;
+ if (Expr.empty()) {
+ // This is just ~/..., resolve it to the current user's home dir.
+ if (!path::home_directory(Storage)) {
+ // For some reason we couldn't get the home directory. Just exit.
+ return;
+ }
+
+ // Overwrite the first character and insert the rest.
+ Path[0] = Storage[0];
+ Path.insert(Path.begin() + 1, Storage.begin() + 1, Storage.end());
+ return;
+ }
+
+ // This is a string of the form ~username/, look up this user's entry in the
+ // password database.
+ struct passwd *Entry = nullptr;
+ std::string User = Expr.str();
+ Entry = ::getpwnam(User.c_str());
+
+ if (!Entry) {
+ // Unable to look up the entry, just return back the original path.
+ return;
+ }
+
+ Storage = Remainder;
+ Path.clear();
+ Path.append(Entry->pw_dir, Entry->pw_dir + strlen(Entry->pw_dir));
+ llvm::sys::path::append(Path, Storage);
+}
+
+
+void expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) {
+ dest.clear();
+ if (path.isTriviallyEmpty())
+ return;
+
+ path.toVector(dest);
+ expandTildeExpr(dest);
+
+ return;
+}
+
+static file_type typeForMode(mode_t Mode) {
+ if (S_ISDIR(Mode))
+ return file_type::directory_file;
+ else if (S_ISREG(Mode))
+ return file_type::regular_file;
+ else if (S_ISBLK(Mode))
+ return file_type::block_file;
+ else if (S_ISCHR(Mode))
+ return file_type::character_file;
+ else if (S_ISFIFO(Mode))
+ return file_type::fifo_file;
+ else if (S_ISSOCK(Mode))
+ return file_type::socket_file;
+ else if (S_ISLNK(Mode))
+ return file_type::symlink_file;
+ return file_type::type_unknown;
+}
+
+static std::error_code fillStatus(int StatRet, const struct stat &Status,
+ file_status &Result) {
+ if (StatRet != 0) {
+ std::error_code EC(errno, std::generic_category());
+ if (EC == errc::no_such_file_or_directory)
+ Result = file_status(file_type::file_not_found);
+ else
+ Result = file_status(file_type::status_error);
+ return EC;
+ }
+
+ uint32_t atime_nsec, mtime_nsec;
+#if defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
+ atime_nsec = Status.st_atimespec.tv_nsec;
+ mtime_nsec = Status.st_mtimespec.tv_nsec;
+#elif defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
+ atime_nsec = Status.st_atim.tv_nsec;
+ mtime_nsec = Status.st_mtim.tv_nsec;
+#else
+ atime_nsec = mtime_nsec = 0;
+#endif
+
+ perms Perms = static_cast<perms>(Status.st_mode) & all_perms;
+ Result = file_status(typeForMode(Status.st_mode), Perms, Status.st_dev,
+ Status.st_nlink, Status.st_ino,
+ Status.st_atime, atime_nsec, Status.st_mtime, mtime_nsec,
+ Status.st_uid, Status.st_gid, Status.st_size);
+
+ return std::error_code();
+}
+
+std::error_code status(const Twine &Path, file_status &Result, bool Follow) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+ struct stat Status;
+ int StatRet = (Follow ? ::stat : ::lstat)(P.begin(), &Status);
+ return fillStatus(StatRet, Status, Result);
+}
+
+std::error_code status(int FD, file_status &Result) {
+ struct stat Status;
+ int StatRet = ::fstat(FD, &Status);
+ return fillStatus(StatRet, Status, Result);
+}
+
+unsigned getUmask() {
+ // Chose arbitary new mask and reset the umask to the old mask.
+ // umask(2) never fails so ignore the return of the second call.
+ unsigned Mask = ::umask(0);
+ (void) ::umask(Mask);
+ return Mask;
+}
+
+std::error_code setPermissions(const Twine &Path, perms Permissions) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+ if (::chmod(P.begin(), Permissions))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+}
+
+std::error_code setPermissions(int FD, perms Permissions) {
+ if (::fchmod(FD, Permissions))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+}
+
+std::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime,
+ TimePoint<> ModificationTime) {
+#if defined(HAVE_FUTIMENS)
+ timespec Times[2];
+ Times[0] = sys::toTimeSpec(AccessTime);
+ Times[1] = sys::toTimeSpec(ModificationTime);
+ if (::futimens(FD, Times))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+#elif defined(HAVE_FUTIMES)
+ timeval Times[2];
+ Times[0] = sys::toTimeVal(
+ std::chrono::time_point_cast<std::chrono::microseconds>(AccessTime));
+ Times[1] =
+ sys::toTimeVal(std::chrono::time_point_cast<std::chrono::microseconds>(
+ ModificationTime));
+ if (::futimes(FD, Times))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+#else
+#warning Missing futimes() and futimens()
+ return make_error_code(errc::function_not_supported);
+#endif
+}
+
+std::error_code mapped_file_region::init(int FD, uint64_t Offset,
+ mapmode Mode) {
+ assert(Size != 0);
+
+ int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
+ int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
+#if defined(__APPLE__)
+ //----------------------------------------------------------------------
+ // Newer versions of MacOSX have a flag that will allow us to read from
+ // binaries whose code signature is invalid without crashing by using
+ // the MAP_RESILIENT_CODESIGN flag. Also if a file from removable media
+ // is mapped we can avoid crashing and return zeroes to any pages we try
+ // to read if the media becomes unavailable by using the
+ // MAP_RESILIENT_MEDIA flag. These flags are only usable when mapping
+ // with PROT_READ, so take care not to specify them otherwise.
+ //----------------------------------------------------------------------
+ if (Mode == readonly) {
+#if defined(MAP_RESILIENT_CODESIGN)
+ flags |= MAP_RESILIENT_CODESIGN;
+#endif
+#if defined(MAP_RESILIENT_MEDIA)
+ flags |= MAP_RESILIENT_MEDIA;
+#endif
+ }
+#endif // #if defined (__APPLE__)
+
+ Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
+ if (Mapping == MAP_FAILED)
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+}
+
+mapped_file_region::mapped_file_region(int fd, mapmode mode, size_t length,
+ uint64_t offset, std::error_code &ec)
+ : Size(length), Mapping(), Mode(mode) {
+ (void)Mode;
+ ec = init(fd, offset, mode);
+ if (ec)
+ Mapping = nullptr;
+}
+
+mapped_file_region::~mapped_file_region() {
+ if (Mapping)
+ ::munmap(Mapping, Size);
+}
+
+size_t mapped_file_region::size() const {
+ assert(Mapping && "Mapping failed but used anyway!");
+ return Size;
+}
+
+char *mapped_file_region::data() const {
+ assert(Mapping && "Mapping failed but used anyway!");
+ return reinterpret_cast<char*>(Mapping);
+}
+
+const char *mapped_file_region::const_data() const {
+ assert(Mapping && "Mapping failed but used anyway!");
+ return reinterpret_cast<const char*>(Mapping);
+}
+
+int mapped_file_region::alignment() {
+ return Process::getPageSizeEstimate();
+}
+
+std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
+ StringRef path,
+ bool follow_symlinks) {
+ SmallString<128> path_null(path);
+ DIR *directory = ::opendir(path_null.c_str());
+ if (!directory)
+ return std::error_code(errno, std::generic_category());
+
+ it.IterationHandle = reinterpret_cast<intptr_t>(directory);
+ // Add something for replace_filename to replace.
+ path::append(path_null, ".");
+ it.CurrentEntry = directory_entry(path_null.str(), follow_symlinks);
+ return directory_iterator_increment(it);
+}
+
+std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
+ if (it.IterationHandle)
+ ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
+ it.IterationHandle = 0;
+ it.CurrentEntry = directory_entry();
+ return std::error_code();
+}
+
+static file_type direntType(dirent* Entry) {
+ // Most platforms provide the file type in the dirent: Linux/BSD/Mac.
+ // The DTTOIF macro lets us reuse our status -> type conversion.
+ // Note that while glibc provides a macro to see if this is supported,
+ // _DIRENT_HAVE_D_TYPE, it's not defined on BSD/Mac, so we test for the
+ // d_type-to-mode_t conversion macro instead.
+#if defined(DTTOIF)
+ return typeForMode(DTTOIF(Entry->d_type));
+#else
+ // Other platforms such as Solaris require a stat() to get the type.
+ return file_type::type_unknown;
+#endif
+}
+
+std::error_code detail::directory_iterator_increment(detail::DirIterState &It) {
+ errno = 0;
+ dirent *CurDir = ::readdir(reinterpret_cast<DIR *>(It.IterationHandle));
+ if (CurDir == nullptr && errno != 0) {
+ return std::error_code(errno, std::generic_category());
+ } else if (CurDir != nullptr) {
+ StringRef Name(CurDir->d_name);
+ if ((Name.size() == 1 && Name[0] == '.') ||
+ (Name.size() == 2 && Name[0] == '.' && Name[1] == '.'))
+ return directory_iterator_increment(It);
+ It.CurrentEntry.replace_filename(Name, direntType(CurDir));
+ } else
+ return directory_iterator_destruct(It);
+
+ return std::error_code();
+}
+
+ErrorOr<basic_file_status> directory_entry::status() const {
+ file_status s;
+ if (auto EC = fs::status(Path, s, FollowSymlinks))
+ return EC;
+ return s;
+}
+
+#if !defined(F_GETPATH)
+static bool hasProcSelfFD() {
+ // If we have a /proc filesystem mounted, we can quickly establish the
+ // real name of the file with readlink
+ static const bool Result = (::access("/proc/self/fd", R_OK) == 0);
+ return Result;
+}
+#endif
+
+static int nativeOpenFlags(CreationDisposition Disp, OpenFlags Flags,
+ FileAccess Access) {
+ int Result = 0;
+ if (Access == FA_Read)
+ Result |= O_RDONLY;
+ else if (Access == FA_Write)
+ Result |= O_WRONLY;
+ else if (Access == (FA_Read | FA_Write))
+ Result |= O_RDWR;
+
+ // This is for compatibility with old code that assumed OF_Append implied
+ // would open an existing file. See Windows/Path.inc for a longer comment.
+ if (Flags & OF_Append)
+ Disp = CD_OpenAlways;
+
+ if (Disp == CD_CreateNew) {
+ Result |= O_CREAT; // Create if it doesn't exist.
+ Result |= O_EXCL; // Fail if it does.
+ } else if (Disp == CD_CreateAlways) {
+ Result |= O_CREAT; // Create if it doesn't exist.
+ Result |= O_TRUNC; // Truncate if it does.
+ } else if (Disp == CD_OpenAlways) {
+ Result |= O_CREAT; // Create if it doesn't exist.
+ } else if (Disp == CD_OpenExisting) {
+ // Nothing special, just don't add O_CREAT and we get these semantics.
+ }
+
+ if (Flags & OF_Append)
+ Result |= O_APPEND;
+
+#ifdef O_CLOEXEC
+ if (!(Flags & OF_ChildInherit))
+ Result |= O_CLOEXEC;
+#endif
+
+ return Result;
+}
+
+std::error_code openFile(const Twine &Name, int &ResultFD,
+ CreationDisposition Disp, FileAccess Access,
+ OpenFlags Flags, unsigned Mode) {
+ int OpenFlags = nativeOpenFlags(Disp, Flags, Access);
+
+ SmallString<128> Storage;
+ StringRef P = Name.toNullTerminatedStringRef(Storage);
+ // Call ::open in a lambda to avoid overload resolution in RetryAfterSignal
+ // when open is overloaded, such as in Bionic.
+ auto Open = [&]() { return ::open(P.begin(), OpenFlags, Mode); };
+ if ((ResultFD = sys::RetryAfterSignal(-1, Open)) < 0)
+ return std::error_code(errno, std::generic_category());
+#ifndef O_CLOEXEC
+ if (!(Flags & OF_ChildInherit)) {
+ int r = fcntl(ResultFD, F_SETFD, FD_CLOEXEC);
+ (void)r;
+ assert(r == 0 && "fcntl(F_SETFD, FD_CLOEXEC) failed");
+ }
+#endif
+ return std::error_code();
+}
+
+Expected<int> openNativeFile(const Twine &Name, CreationDisposition Disp,
+ FileAccess Access, OpenFlags Flags,
+ unsigned Mode) {
+
+ int FD;
+ std::error_code EC = openFile(Name, FD, Disp, Access, Flags, Mode);
+ if (EC)
+ return errorCodeToError(EC);
+ return FD;
+}
+
+std::error_code openFileForRead(const Twine &Name, int &ResultFD,
+ OpenFlags Flags,
+ SmallVectorImpl<char> *RealPath) {
+ std::error_code EC =
+ openFile(Name, ResultFD, CD_OpenExisting, FA_Read, Flags, 0666);
+ if (EC)
+ return EC;
+
+ // Attempt to get the real name of the file, if the user asked
+ if(!RealPath)
+ return std::error_code();
+ RealPath->clear();
+#if defined(F_GETPATH)
+ // When F_GETPATH is availble, it is the quickest way to get
+ // the real path name.
+ char Buffer[MAXPATHLEN];
+ if (::fcntl(ResultFD, F_GETPATH, Buffer) != -1)
+ RealPath->append(Buffer, Buffer + strlen(Buffer));
+#else
+ char Buffer[PATH_MAX];
+ if (hasProcSelfFD()) {
+ char ProcPath[64];
+ snprintf(ProcPath, sizeof(ProcPath), "/proc/self/fd/%d", ResultFD);
+ ssize_t CharCount = ::readlink(ProcPath, Buffer, sizeof(Buffer));
+ if (CharCount > 0)
+ RealPath->append(Buffer, Buffer + CharCount);
+ } else {
+ SmallString<128> Storage;
+ StringRef P = Name.toNullTerminatedStringRef(Storage);
+
+ // Use ::realpath to get the real path name
+ if (::realpath(P.begin(), Buffer) != nullptr)
+ RealPath->append(Buffer, Buffer + strlen(Buffer));
+ }
+#endif
+ return std::error_code();
+}
+
+Expected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags,
+ SmallVectorImpl<char> *RealPath) {
+ file_t ResultFD;
+ std::error_code EC = openFileForRead(Name, ResultFD, Flags, RealPath);
+ if (EC)
+ return errorCodeToError(EC);
+ return ResultFD;
+}
+
+file_t getStdinHandle() { return 0; }
+file_t getStdoutHandle() { return 1; }
+file_t getStderrHandle() { return 2; }
+
+Expected<size_t> readNativeFile(file_t FD, MutableArrayRef<char> Buf) {
+ ssize_t NumRead =
+ sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Buf.size());
+ if (ssize_t(NumRead) == -1)
+ return errorCodeToError(std::error_code(errno, std::generic_category()));
+ return NumRead;
+}
+
+Expected<size_t> readNativeFileSlice(file_t FD, MutableArrayRef<char> Buf,
+ uint64_t Offset) {
+#ifdef HAVE_PREAD
+ ssize_t NumRead =
+ sys::RetryAfterSignal(-1, ::pread, FD, Buf.data(), Buf.size(), Offset);
+#else
+ if (lseek(FD, Offset, SEEK_SET) == -1)
+ return errorCodeToError(std::error_code(errno, std::generic_category()));
+ ssize_t NumRead =
+ sys::RetryAfterSignal(-1, ::read, FD, Buf.data(), Buf.size());
+#endif
+ if (NumRead == -1)
+ return errorCodeToError(std::error_code(errno, std::generic_category()));
+ return NumRead;
+}
+
+std::error_code closeFile(file_t &F) {
+ file_t TmpF = F;
+ F = kInvalidFile;
+ return Process::SafelyCloseFileDescriptor(TmpF);
+}
+
+template <typename T>
+static std::error_code remove_directories_impl(const T &Entry,
+ bool IgnoreErrors) {
+ std::error_code EC;
+ directory_iterator Begin(Entry, EC, false);
+ directory_iterator End;
+ while (Begin != End) {
+ auto &Item = *Begin;
+ ErrorOr<basic_file_status> st = Item.status();
+ if (!st && !IgnoreErrors)
+ return st.getError();
+
+ if (is_directory(*st)) {
+ EC = remove_directories_impl(Item, IgnoreErrors);
+ if (EC && !IgnoreErrors)
+ return EC;
+ }
+
+ EC = fs::remove(Item.path(), true);
+ if (EC && !IgnoreErrors)
+ return EC;
+
+ Begin.increment(EC);
+ if (EC && !IgnoreErrors)
+ return EC;
+ }
+ return std::error_code();
+}
+
+std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
+ auto EC = remove_directories_impl(path, IgnoreErrors);
+ if (EC && !IgnoreErrors)
+ return EC;
+ EC = fs::remove(path, true);
+ if (EC && !IgnoreErrors)
+ return EC;
+ return std::error_code();
+}
+
+std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
+ bool expand_tilde) {
+ dest.clear();
+ if (path.isTriviallyEmpty())
+ return std::error_code();
+
+ if (expand_tilde) {
+ SmallString<128> Storage;
+ path.toVector(Storage);
+ expandTildeExpr(Storage);
+ return real_path(Storage, dest, false);
+ }
+
+ SmallString<128> Storage;
+ StringRef P = path.toNullTerminatedStringRef(Storage);
+ char Buffer[PATH_MAX];
+ if (::realpath(P.begin(), Buffer) == nullptr)
+ return std::error_code(errno, std::generic_category());
+ dest.append(Buffer, Buffer + strlen(Buffer));
+ return std::error_code();
+}
+
+} // end namespace fs
+
+namespace path {
+
+bool home_directory(SmallVectorImpl<char> &result) {
+ char *RequestedDir = getenv("HOME");
+ if (!RequestedDir) {
+ struct passwd *pw = getpwuid(getuid());
+ if (pw && pw->pw_dir)
+ RequestedDir = pw->pw_dir;
+ }
+ if (!RequestedDir)
+ return false;
+
+ result.clear();
+ result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+ return true;
+}
+
+static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
+ #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 = TempDir ? _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 true;
+ }
+
+ Result.clear();
+ }
+ #endif
+ 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 (getDarwinConfDir(ErasedOnReboot, Result))
+ return;
+
+ const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
+ Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+}
+
+} // end namespace path
+
+namespace fs {
+
+#ifdef __APPLE__
+/// This implementation tries to perform an APFS CoW clone of the file,
+/// which can be much faster and uses less space.
+/// Unfortunately fcopyfile(3) does not support COPYFILE_CLONE, so the
+/// file descriptor variant of this function still uses the default
+/// implementation.
+std::error_code copy_file(const Twine &From, const Twine &To) {
+ uint32_t Flag = COPYFILE_DATA;
+#if __has_builtin(__builtin_available) && defined(COPYFILE_CLONE)
+ if (__builtin_available(macos 10.12, *)) {
+ bool IsSymlink;
+ if (std::error_code Error = is_symlink_file(From, IsSymlink))
+ return Error;
+ // COPYFILE_CLONE clones the symlink instead of following it
+ // and returns EEXISTS if the target file already exists.
+ if (!IsSymlink && !exists(To))
+ Flag = COPYFILE_CLONE;
+ }
+#endif
+ int Status =
+ copyfile(From.str().c_str(), To.str().c_str(), /* State */ NULL, Flag);
+
+ if (Status == 0)
+ return std::error_code();
+ return std::error_code(errno, std::generic_category());
+}
+#endif // __APPLE__
+
+} // end namespace fs
+
+} // end namespace sys
+} // end namespace llvm
diff --git a/llvm/lib/Support/Unix/Process.inc b/llvm/lib/Support/Unix/Process.inc
new file mode 100644
index 000000000000..dfe81d7e2833
--- /dev/null
+++ b/llvm/lib/Support/Unix/Process.inc
@@ -0,0 +1,459 @@
+//===- Unix/Process.cpp - Unix Process Implementation --------- -*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the generic Unix implementation of the Process class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <mutex>
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if defined(HAVE_MALLINFO)
+#include <malloc.h>
+#endif
+#if defined(HAVE_MALLCTL)
+#include <malloc_np.h>
+#endif
+#ifdef HAVE_MALLOC_MALLOC_H
+#include <malloc/malloc.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+# include <sys/ioctl.h>
+#endif
+#ifdef HAVE_TERMIOS_H
+# include <termios.h>
+#endif
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+using namespace llvm;
+using namespace sys;
+
+static std::pair<std::chrono::microseconds, std::chrono::microseconds> getRUsageTimes() {
+#if defined(HAVE_GETRUSAGE)
+ struct rusage RU;
+ ::getrusage(RUSAGE_SELF, &RU);
+ return { toDuration(RU.ru_utime), toDuration(RU.ru_stime) };
+#else
+#warning Cannot get usage times on this platform
+ return { std::chrono::microseconds::zero(), std::chrono::microseconds::zero() };
+#endif
+}
+
+// On Cygwin, getpagesize() returns 64k(AllocationGranularity) and
+// offset in mmap(3) should be aligned to the AllocationGranularity.
+Expected<unsigned> Process::getPageSize() {
+#if defined(HAVE_GETPAGESIZE)
+ static const int page_size = ::getpagesize();
+#elif defined(HAVE_SYSCONF)
+ static long page_size = ::sysconf(_SC_PAGE_SIZE);
+#else
+#error Cannot get the page size on this machine
+#endif
+ if (page_size == -1)
+ return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+ return static_cast<unsigned>(page_size);
+}
+
+size_t Process::GetMallocUsage() {
+#if defined(HAVE_MALLINFO)
+ struct mallinfo mi;
+ mi = ::mallinfo();
+ return mi.uordblks;
+#elif defined(HAVE_MALLOC_ZONE_STATISTICS) && defined(HAVE_MALLOC_MALLOC_H)
+ malloc_statistics_t Stats;
+ malloc_zone_statistics(malloc_default_zone(), &Stats);
+ return Stats.size_in_use; // darwin
+#elif defined(HAVE_MALLCTL)
+ size_t alloc, sz;
+ sz = sizeof(size_t);
+ if (mallctl("stats.allocated", &alloc, &sz, NULL, 0) == 0)
+ return alloc;
+ return 0;
+#elif defined(HAVE_SBRK)
+ // Note this is only an approximation and more closely resembles
+ // the value returned by mallinfo in the arena field.
+ static char *StartOfMemory = reinterpret_cast<char*>(::sbrk(0));
+ char *EndOfMemory = (char*)sbrk(0);
+ if (EndOfMemory != ((char*)-1) && StartOfMemory != ((char*)-1))
+ return EndOfMemory - StartOfMemory;
+ return 0;
+#else
+#warning Cannot get malloc info on this platform
+ return 0;
+#endif
+}
+
+void Process::GetTimeUsage(TimePoint<> &elapsed, std::chrono::nanoseconds &user_time,
+ std::chrono::nanoseconds &sys_time) {
+ elapsed = std::chrono::system_clock::now();
+ std::tie(user_time, sys_time) = getRUsageTimes();
+}
+
+#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
+#include <mach/mach.h>
+#endif
+
+// Some LLVM programs such as bugpoint produce core files as a normal part of
+// their operation. To prevent the disk from filling up, this function
+// does what's necessary to prevent their generation.
+void Process::PreventCoreFiles() {
+#if HAVE_SETRLIMIT
+ struct rlimit rlim;
+ rlim.rlim_cur = rlim.rlim_max = 0;
+ setrlimit(RLIMIT_CORE, &rlim);
+#endif
+
+#if defined(HAVE_MACH_MACH_H) && !defined(__GNU__)
+ // Disable crash reporting on Mac OS X 10.0-10.4
+
+ // get information about the original set of exception ports for the task
+ mach_msg_type_number_t Count = 0;
+ exception_mask_t OriginalMasks[EXC_TYPES_COUNT];
+ exception_port_t OriginalPorts[EXC_TYPES_COUNT];
+ exception_behavior_t OriginalBehaviors[EXC_TYPES_COUNT];
+ thread_state_flavor_t OriginalFlavors[EXC_TYPES_COUNT];
+ kern_return_t err =
+ task_get_exception_ports(mach_task_self(), EXC_MASK_ALL, OriginalMasks,
+ &Count, OriginalPorts, OriginalBehaviors,
+ OriginalFlavors);
+ if (err == KERN_SUCCESS) {
+ // replace each with MACH_PORT_NULL.
+ for (unsigned i = 0; i != Count; ++i)
+ task_set_exception_ports(mach_task_self(), OriginalMasks[i],
+ MACH_PORT_NULL, OriginalBehaviors[i],
+ OriginalFlavors[i]);
+ }
+
+ // Disable crash reporting on Mac OS X 10.5
+ signal(SIGABRT, _exit);
+ signal(SIGILL, _exit);
+ signal(SIGFPE, _exit);
+ signal(SIGSEGV, _exit);
+ signal(SIGBUS, _exit);
+#endif
+
+ coreFilesPrevented = true;
+}
+
+Optional<std::string> Process::GetEnv(StringRef Name) {
+ std::string NameStr = Name.str();
+ const char *Val = ::getenv(NameStr.c_str());
+ if (!Val)
+ return None;
+ return std::string(Val);
+}
+
+namespace {
+class FDCloser {
+public:
+ FDCloser(int &FD) : FD(FD), KeepOpen(false) {}
+ void keepOpen() { KeepOpen = true; }
+ ~FDCloser() {
+ if (!KeepOpen && FD >= 0)
+ ::close(FD);
+ }
+
+private:
+ FDCloser(const FDCloser &) = delete;
+ void operator=(const FDCloser &) = delete;
+
+ int &FD;
+ bool KeepOpen;
+};
+}
+
+std::error_code Process::FixupStandardFileDescriptors() {
+ int NullFD = -1;
+ FDCloser FDC(NullFD);
+ const int StandardFDs[] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
+ for (int StandardFD : StandardFDs) {
+ struct stat st;
+ errno = 0;
+ if (RetryAfterSignal(-1, ::fstat, StandardFD, &st) < 0) {
+ assert(errno && "expected errno to be set if fstat failed!");
+ // fstat should return EBADF if the file descriptor is closed.
+ if (errno != EBADF)
+ return std::error_code(errno, std::generic_category());
+ }
+ // if fstat succeeds, move on to the next FD.
+ if (!errno)
+ continue;
+ assert(errno == EBADF && "expected errno to have EBADF at this point!");
+
+ if (NullFD < 0) {
+ // Call ::open in a lambda to avoid overload resolution in
+ // RetryAfterSignal when open is overloaded, such as in Bionic.
+ auto Open = [&]() { return ::open("/dev/null", O_RDWR); };
+ if ((NullFD = RetryAfterSignal(-1, Open)) < 0)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ if (NullFD == StandardFD)
+ FDC.keepOpen();
+ else if (dup2(NullFD, StandardFD) < 0)
+ return std::error_code(errno, std::generic_category());
+ }
+ return std::error_code();
+}
+
+std::error_code Process::SafelyCloseFileDescriptor(int FD) {
+ // Create a signal set filled with *all* signals.
+ sigset_t FullSet;
+ if (sigfillset(&FullSet) < 0)
+ return std::error_code(errno, std::generic_category());
+ // Atomically swap our current signal mask with a full mask.
+ sigset_t SavedSet;
+#if LLVM_ENABLE_THREADS
+ if (int EC = pthread_sigmask(SIG_SETMASK, &FullSet, &SavedSet))
+ return std::error_code(EC, std::generic_category());
+#else
+ if (sigprocmask(SIG_SETMASK, &FullSet, &SavedSet) < 0)
+ return std::error_code(errno, std::generic_category());
+#endif
+ // Attempt to close the file descriptor.
+ // We need to save the error, if one occurs, because our subsequent call to
+ // pthread_sigmask might tamper with errno.
+ int ErrnoFromClose = 0;
+ if (::close(FD) < 0)
+ ErrnoFromClose = errno;
+ // Restore the signal mask back to what we saved earlier.
+ int EC = 0;
+#if LLVM_ENABLE_THREADS
+ EC = pthread_sigmask(SIG_SETMASK, &SavedSet, nullptr);
+#else
+ if (sigprocmask(SIG_SETMASK, &SavedSet, nullptr) < 0)
+ EC = errno;
+#endif
+ // The error code from close takes precedence over the one from
+ // pthread_sigmask.
+ if (ErrnoFromClose)
+ return std::error_code(ErrnoFromClose, std::generic_category());
+ return std::error_code(EC, std::generic_category());
+}
+
+bool Process::StandardInIsUserInput() {
+ return FileDescriptorIsDisplayed(STDIN_FILENO);
+}
+
+bool Process::StandardOutIsDisplayed() {
+ return FileDescriptorIsDisplayed(STDOUT_FILENO);
+}
+
+bool Process::StandardErrIsDisplayed() {
+ return FileDescriptorIsDisplayed(STDERR_FILENO);
+}
+
+bool Process::FileDescriptorIsDisplayed(int fd) {
+#if HAVE_ISATTY
+ return isatty(fd);
+#else
+ // If we don't have isatty, just return false.
+ return false;
+#endif
+}
+
+static unsigned getColumns(int FileID) {
+ // If COLUMNS is defined in the environment, wrap to that many columns.
+ if (const char *ColumnsStr = std::getenv("COLUMNS")) {
+ int Columns = std::atoi(ColumnsStr);
+ if (Columns > 0)
+ return Columns;
+ }
+
+ unsigned Columns = 0;
+
+#if defined(HAVE_SYS_IOCTL_H) && defined(HAVE_TERMIOS_H) \
+ && !(defined(_XOPEN_SOURCE) || defined(_POSIX_C_SOURCE))
+ // Try to determine the width of the terminal.
+ struct winsize ws;
+ if (ioctl(FileID, TIOCGWINSZ, &ws) == 0)
+ Columns = ws.ws_col;
+#endif
+
+ return Columns;
+}
+
+unsigned Process::StandardOutColumns() {
+ if (!StandardOutIsDisplayed())
+ return 0;
+
+ return getColumns(1);
+}
+
+unsigned Process::StandardErrColumns() {
+ if (!StandardErrIsDisplayed())
+ return 0;
+
+ return getColumns(2);
+}
+
+#ifdef HAVE_TERMINFO
+// We manually declare these extern functions because finding the correct
+// headers from various terminfo, curses, or other sources is harder than
+// writing their specs down.
+extern "C" int setupterm(char *term, int filedes, int *errret);
+extern "C" struct term *set_curterm(struct term *termp);
+extern "C" int del_curterm(struct term *termp);
+extern "C" int tigetnum(char *capname);
+#endif
+
+#ifdef HAVE_TERMINFO
+static ManagedStatic<std::mutex> TermColorMutex;
+#endif
+
+static bool terminalHasColors(int fd) {
+#ifdef HAVE_TERMINFO
+ // First, acquire a global lock because these C routines are thread hostile.
+ std::lock_guard<std::mutex> G(*TermColorMutex);
+
+ int errret = 0;
+ if (setupterm(nullptr, fd, &errret) != 0)
+ // Regardless of why, if we can't get terminfo, we shouldn't try to print
+ // colors.
+ return false;
+
+ // Test whether the terminal as set up supports color output. How to do this
+ // isn't entirely obvious. We can use the curses routine 'has_colors' but it
+ // would be nice to avoid a dependency on curses proper when we can make do
+ // with a minimal terminfo parsing library. Also, we don't really care whether
+ // the terminal supports the curses-specific color changing routines, merely
+ // if it will interpret ANSI color escape codes in a reasonable way. Thus, the
+ // strategy here is just to query the baseline colors capability and if it
+ // supports colors at all to assume it will translate the escape codes into
+ // whatever range of colors it does support. We can add more detailed tests
+ // here if users report them as necessary.
+ //
+ // The 'tigetnum' routine returns -2 or -1 on errors, and might return 0 if
+ // the terminfo says that no colors are supported.
+ bool HasColors = tigetnum(const_cast<char *>("colors")) > 0;
+
+ // Now extract the structure allocated by setupterm and free its memory
+ // through a really silly dance.
+ struct term *termp = set_curterm(nullptr);
+ (void)del_curterm(termp); // Drop any errors here.
+
+ // Return true if we found a color capabilities for the current terminal.
+ if (HasColors)
+ return true;
+#else
+ // When the terminfo database is not available, check if the current terminal
+ // is one of terminals that are known to support ANSI color escape codes.
+ if (const char *TermStr = std::getenv("TERM")) {
+ return StringSwitch<bool>(TermStr)
+ .Case("ansi", true)
+ .Case("cygwin", true)
+ .Case("linux", true)
+ .StartsWith("screen", true)
+ .StartsWith("xterm", true)
+ .StartsWith("vt100", true)
+ .StartsWith("rxvt", true)
+ .EndsWith("color", true)
+ .Default(false);
+ }
+#endif
+
+ // Otherwise, be conservative.
+ return false;
+}
+
+bool Process::FileDescriptorHasColors(int fd) {
+ // A file descriptor has colors if it is displayed and the terminal has
+ // colors.
+ return FileDescriptorIsDisplayed(fd) && terminalHasColors(fd);
+}
+
+bool Process::StandardOutHasColors() {
+ return FileDescriptorHasColors(STDOUT_FILENO);
+}
+
+bool Process::StandardErrHasColors() {
+ return FileDescriptorHasColors(STDERR_FILENO);
+}
+
+void Process::UseANSIEscapeCodes(bool /*enable*/) {
+ // No effect.
+}
+
+bool Process::ColorNeedsFlush() {
+ // No, we use ANSI escape sequences.
+ return false;
+}
+
+const char *Process::OutputColor(char code, bool bold, bool bg) {
+ return colorcodes[bg?1:0][bold?1:0][code&7];
+}
+
+const char *Process::OutputBold(bool bg) {
+ return "\033[1m";
+}
+
+const char *Process::OutputReverse() {
+ return "\033[7m";
+}
+
+const char *Process::ResetColor() {
+ return "\033[0m";
+}
+
+#if !HAVE_DECL_ARC4RANDOM
+static unsigned GetRandomNumberSeed() {
+ // Attempt to get the initial seed from /dev/urandom, if possible.
+ int urandomFD = open("/dev/urandom", O_RDONLY);
+
+ if (urandomFD != -1) {
+ unsigned seed;
+ // Don't use a buffered read to avoid reading more data
+ // from /dev/urandom than we need.
+ int count = read(urandomFD, (void *)&seed, sizeof(seed));
+
+ close(urandomFD);
+
+ // Return the seed if the read was successful.
+ if (count == sizeof(seed))
+ return seed;
+ }
+
+ // Otherwise, swizzle the current time and the process ID to form a reasonable
+ // seed.
+ const auto Now = std::chrono::high_resolution_clock::now();
+ return hash_combine(Now.time_since_epoch().count(), ::getpid());
+}
+#endif
+
+unsigned llvm::sys::Process::GetRandomNumber() {
+#if HAVE_DECL_ARC4RANDOM
+ return arc4random();
+#else
+ static int x = (static_cast<void>(::srand(GetRandomNumberSeed())), 0);
+ (void)x;
+ return ::rand();
+#endif
+}
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
new file mode 100644
index 000000000000..520685a0e987
--- /dev/null
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -0,0 +1,500 @@
+//===- llvm/Support/Unix/Program.cpp -----------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix specific portion of the Program class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/raw_ostream.h"
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_POSIX_SPAWN
+#include <spawn.h>
+
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+
+#if defined(__APPLE__) && !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE)
+#define USE_NSGETENVIRON 1
+#else
+#define USE_NSGETENVIRON 0
+#endif
+
+#if !USE_NSGETENVIRON
+ extern char **environ;
+#else
+#include <crt_externs.h> // _NSGetEnviron
+#endif
+#endif
+
+namespace llvm {
+
+using namespace sys;
+
+ProcessInfo::ProcessInfo() : Pid(0), ReturnCode(0) {}
+
+ErrorOr<std::string> sys::findProgramByName(StringRef Name,
+ ArrayRef<StringRef> Paths) {
+ assert(!Name.empty() && "Must have a name!");
+ // Use the given path verbatim if it contains any slashes; this matches
+ // the behavior of sh(1) and friends.
+ if (Name.find('/') != StringRef::npos)
+ return std::string(Name);
+
+ SmallVector<StringRef, 16> EnvironmentPaths;
+ if (Paths.empty())
+ if (const char *PathEnv = std::getenv("PATH")) {
+ SplitString(PathEnv, EnvironmentPaths, ":");
+ Paths = EnvironmentPaths;
+ }
+
+ for (auto Path : Paths) {
+ if (Path.empty())
+ continue;
+
+ // Check to see if this first directory contains the executable...
+ SmallString<128> FilePath(Path);
+ sys::path::append(FilePath, Name);
+ if (sys::fs::can_execute(FilePath.c_str()))
+ return std::string(FilePath.str()); // Found the executable!
+ }
+ return errc::no_such_file_or_directory;
+}
+
+static bool RedirectIO(Optional<StringRef> Path, int FD, std::string* ErrMsg) {
+ if (!Path) // Noop
+ return false;
+ std::string File;
+ if (Path->empty())
+ // Redirect empty paths to /dev/null
+ File = "/dev/null";
+ else
+ File = *Path;
+
+ // Open the file
+ int InFD = open(File.c_str(), FD == 0 ? O_RDONLY : O_WRONLY|O_CREAT, 0666);
+ if (InFD == -1) {
+ MakeErrMsg(ErrMsg, "Cannot open file '" + File + "' for "
+ + (FD == 0 ? "input" : "output"));
+ return true;
+ }
+
+ // Install it as the requested FD
+ if (dup2(InFD, FD) == -1) {
+ MakeErrMsg(ErrMsg, "Cannot dup2");
+ close(InFD);
+ return true;
+ }
+ close(InFD); // Close the original FD
+ return false;
+}
+
+#ifdef HAVE_POSIX_SPAWN
+static bool RedirectIO_PS(const std::string *Path, int FD, std::string *ErrMsg,
+ posix_spawn_file_actions_t *FileActions) {
+ if (!Path) // Noop
+ return false;
+ const char *File;
+ if (Path->empty())
+ // Redirect empty paths to /dev/null
+ File = "/dev/null";
+ else
+ File = Path->c_str();
+
+ if (int Err = posix_spawn_file_actions_addopen(
+ FileActions, FD, File,
+ FD == 0 ? O_RDONLY : O_WRONLY | O_CREAT, 0666))
+ return MakeErrMsg(ErrMsg, "Cannot posix_spawn_file_actions_addopen", Err);
+ return false;
+}
+#endif
+
+static void TimeOutHandler(int Sig) {
+}
+
+static void SetMemoryLimits(unsigned size) {
+#if HAVE_SYS_RESOURCE_H && HAVE_GETRLIMIT && HAVE_SETRLIMIT
+ struct rlimit r;
+ __typeof__ (r.rlim_cur) limit = (__typeof__ (r.rlim_cur)) (size) * 1048576;
+
+ // Heap size
+ getrlimit (RLIMIT_DATA, &r);
+ r.rlim_cur = limit;
+ setrlimit (RLIMIT_DATA, &r);
+#ifdef RLIMIT_RSS
+ // Resident set size.
+ getrlimit (RLIMIT_RSS, &r);
+ r.rlim_cur = limit;
+ setrlimit (RLIMIT_RSS, &r);
+#endif
+#endif
+}
+
+}
+
+static std::vector<const char *>
+toNullTerminatedCStringArray(ArrayRef<StringRef> Strings, StringSaver &Saver) {
+ std::vector<const char *> Result;
+ for (StringRef S : Strings)
+ Result.push_back(Saver.save(S).data());
+ Result.push_back(nullptr);
+ return Result;
+}
+
+static bool Execute(ProcessInfo &PI, StringRef Program,
+ ArrayRef<StringRef> Args, Optional<ArrayRef<StringRef>> Env,
+ ArrayRef<Optional<StringRef>> Redirects,
+ unsigned MemoryLimit, std::string *ErrMsg) {
+ if (!llvm::sys::fs::exists(Program)) {
+ if (ErrMsg)
+ *ErrMsg = std::string("Executable \"") + Program.str() +
+ std::string("\" doesn't exist!");
+ return false;
+ }
+
+ BumpPtrAllocator Allocator;
+ StringSaver Saver(Allocator);
+ std::vector<const char *> ArgVector, EnvVector;
+ const char **Argv = nullptr;
+ const char **Envp = nullptr;
+ ArgVector = toNullTerminatedCStringArray(Args, Saver);
+ Argv = ArgVector.data();
+ if (Env) {
+ EnvVector = toNullTerminatedCStringArray(*Env, Saver);
+ Envp = EnvVector.data();
+ }
+
+ // If this OS has posix_spawn and there is no memory limit being implied, use
+ // posix_spawn. It is more efficient than fork/exec.
+#ifdef HAVE_POSIX_SPAWN
+ if (MemoryLimit == 0) {
+ posix_spawn_file_actions_t FileActionsStore;
+ posix_spawn_file_actions_t *FileActions = nullptr;
+
+ // If we call posix_spawn_file_actions_addopen we have to make sure the
+ // c strings we pass to it stay alive until the call to posix_spawn,
+ // so we copy any StringRefs into this variable.
+ std::string RedirectsStorage[3];
+
+ if (!Redirects.empty()) {
+ assert(Redirects.size() == 3);
+ std::string *RedirectsStr[3] = {nullptr, nullptr, nullptr};
+ for (int I = 0; I < 3; ++I) {
+ if (Redirects[I]) {
+ RedirectsStorage[I] = *Redirects[I];
+ RedirectsStr[I] = &RedirectsStorage[I];
+ }
+ }
+
+ FileActions = &FileActionsStore;
+ posix_spawn_file_actions_init(FileActions);
+
+ // Redirect stdin/stdout.
+ if (RedirectIO_PS(RedirectsStr[0], 0, ErrMsg, FileActions) ||
+ RedirectIO_PS(RedirectsStr[1], 1, ErrMsg, FileActions))
+ return false;
+ if (!Redirects[1] || !Redirects[2] || *Redirects[1] != *Redirects[2]) {
+ // Just redirect stderr
+ if (RedirectIO_PS(RedirectsStr[2], 2, ErrMsg, FileActions))
+ return false;
+ } else {
+ // If stdout and stderr should go to the same place, redirect stderr
+ // to the FD already open for stdout.
+ if (int Err = posix_spawn_file_actions_adddup2(FileActions, 1, 2))
+ return !MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout", Err);
+ }
+ }
+
+ if (!Envp)
+#if !USE_NSGETENVIRON
+ Envp = const_cast<const char **>(environ);
+#else
+ // environ is missing in dylibs.
+ Envp = const_cast<const char **>(*_NSGetEnviron());
+#endif
+
+ constexpr int maxRetries = 8;
+ int retries = 0;
+ pid_t PID;
+ int Err;
+ do {
+ PID = 0; // Make Valgrind happy.
+ Err = posix_spawn(&PID, Program.str().c_str(), FileActions,
+ /*attrp*/ nullptr, const_cast<char **>(Argv),
+ const_cast<char **>(Envp));
+ } while (Err == EINTR && ++retries < maxRetries);
+
+ if (FileActions)
+ posix_spawn_file_actions_destroy(FileActions);
+
+ if (Err)
+ return !MakeErrMsg(ErrMsg, "posix_spawn failed", Err);
+
+ PI.Pid = PID;
+ PI.Process = PID;
+
+ return true;
+ }
+#endif
+
+ // Create a child process.
+ int child = fork();
+ switch (child) {
+ // An error occurred: Return to the caller.
+ case -1:
+ MakeErrMsg(ErrMsg, "Couldn't fork");
+ return false;
+
+ // Child process: Execute the program.
+ case 0: {
+ // Redirect file descriptors...
+ if (!Redirects.empty()) {
+ // Redirect stdin
+ if (RedirectIO(Redirects[0], 0, ErrMsg)) { return false; }
+ // Redirect stdout
+ if (RedirectIO(Redirects[1], 1, ErrMsg)) { return false; }
+ if (Redirects[1] && Redirects[2] && *Redirects[1] == *Redirects[2]) {
+ // If stdout and stderr should go to the same place, redirect stderr
+ // to the FD already open for stdout.
+ if (-1 == dup2(1,2)) {
+ MakeErrMsg(ErrMsg, "Can't redirect stderr to stdout");
+ return false;
+ }
+ } else {
+ // Just redirect stderr
+ if (RedirectIO(Redirects[2], 2, ErrMsg)) { return false; }
+ }
+ }
+
+ // Set memory limits
+ if (MemoryLimit!=0) {
+ SetMemoryLimits(MemoryLimit);
+ }
+
+ // Execute!
+ std::string PathStr = Program;
+ if (Envp != nullptr)
+ execve(PathStr.c_str(), const_cast<char **>(Argv),
+ const_cast<char **>(Envp));
+ else
+ execv(PathStr.c_str(), const_cast<char **>(Argv));
+ // If the execve() failed, we should exit. Follow Unix protocol and
+ // return 127 if the executable was not found, and 126 otherwise.
+ // Use _exit rather than exit so that atexit functions and static
+ // object destructors cloned from the parent process aren't
+ // redundantly run, and so that any data buffered in stdio buffers
+ // cloned from the parent aren't redundantly written out.
+ _exit(errno == ENOENT ? 127 : 126);
+ }
+
+ // Parent process: Break out of the switch to do our processing.
+ default:
+ break;
+ }
+
+ PI.Pid = child;
+ PI.Process = child;
+
+ return true;
+}
+
+namespace llvm {
+
+ProcessInfo sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
+ bool WaitUntilTerminates, std::string *ErrMsg) {
+ struct sigaction Act, Old;
+ assert(PI.Pid && "invalid pid to wait on, process not started?");
+
+ int WaitPidOptions = 0;
+ pid_t ChildPid = PI.Pid;
+ if (WaitUntilTerminates) {
+ SecondsToWait = 0;
+ } else if (SecondsToWait) {
+ // Install a timeout handler. The handler itself does nothing, but the
+ // simple fact of having a handler at all causes the wait below to return
+ // with EINTR, unlike if we used SIG_IGN.
+ memset(&Act, 0, sizeof(Act));
+ Act.sa_handler = TimeOutHandler;
+ sigemptyset(&Act.sa_mask);
+ sigaction(SIGALRM, &Act, &Old);
+ alarm(SecondsToWait);
+ } else if (SecondsToWait == 0)
+ WaitPidOptions = WNOHANG;
+
+ // Parent process: Wait for the child process to terminate.
+ int status;
+ ProcessInfo WaitResult;
+
+ do {
+ WaitResult.Pid = waitpid(ChildPid, &status, WaitPidOptions);
+ } while (WaitUntilTerminates && WaitResult.Pid == -1 && errno == EINTR);
+
+ if (WaitResult.Pid != PI.Pid) {
+ if (WaitResult.Pid == 0) {
+ // Non-blocking wait.
+ return WaitResult;
+ } else {
+ if (SecondsToWait && errno == EINTR) {
+ // Kill the child.
+ kill(PI.Pid, SIGKILL);
+
+ // Turn off the alarm and restore the signal handler
+ alarm(0);
+ sigaction(SIGALRM, &Old, nullptr);
+
+ // Wait for child to die
+ if (wait(&status) != ChildPid)
+ MakeErrMsg(ErrMsg, "Child timed out but wouldn't die");
+ else
+ MakeErrMsg(ErrMsg, "Child timed out", 0);
+
+ WaitResult.ReturnCode = -2; // Timeout detected
+ return WaitResult;
+ } else if (errno != EINTR) {
+ MakeErrMsg(ErrMsg, "Error waiting for child process");
+ WaitResult.ReturnCode = -1;
+ return WaitResult;
+ }
+ }
+ }
+
+ // We exited normally without timeout, so turn off the timer.
+ if (SecondsToWait && !WaitUntilTerminates) {
+ alarm(0);
+ sigaction(SIGALRM, &Old, nullptr);
+ }
+
+ // Return the proper exit status. Detect error conditions
+ // so we can return -1 for them and set ErrMsg informatively.
+ int result = 0;
+ if (WIFEXITED(status)) {
+ result = WEXITSTATUS(status);
+ WaitResult.ReturnCode = result;
+
+ if (result == 127) {
+ if (ErrMsg)
+ *ErrMsg = llvm::sys::StrError(ENOENT);
+ WaitResult.ReturnCode = -1;
+ return WaitResult;
+ }
+ if (result == 126) {
+ if (ErrMsg)
+ *ErrMsg = "Program could not be executed";
+ WaitResult.ReturnCode = -1;
+ return WaitResult;
+ }
+ } else if (WIFSIGNALED(status)) {
+ if (ErrMsg) {
+ *ErrMsg = strsignal(WTERMSIG(status));
+#ifdef WCOREDUMP
+ if (WCOREDUMP(status))
+ *ErrMsg += " (core dumped)";
+#endif
+ }
+ // Return a special value to indicate that the process received an unhandled
+ // signal during execution as opposed to failing to execute.
+ WaitResult.ReturnCode = -2;
+ }
+ return WaitResult;
+}
+
+std::error_code sys::ChangeStdinToBinary() {
+ // Do nothing, as Unix doesn't differentiate between text and binary.
+ return std::error_code();
+}
+
+std::error_code sys::ChangeStdoutToBinary() {
+ // Do nothing, as Unix doesn't differentiate between text and binary.
+ return std::error_code();
+}
+
+std::error_code
+llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
+ WindowsEncodingMethod Encoding /*unused*/) {
+ std::error_code EC;
+ llvm::raw_fd_ostream OS(FileName, EC, llvm::sys::fs::OpenFlags::OF_Text);
+
+ if (EC)
+ return EC;
+
+ OS << Contents;
+
+ if (OS.has_error())
+ return make_error_code(errc::io_error);
+
+ return EC;
+}
+
+bool llvm::sys::commandLineFitsWithinSystemLimits(StringRef Program,
+ ArrayRef<StringRef> Args) {
+ static long ArgMax = sysconf(_SC_ARG_MAX);
+ // POSIX requires that _POSIX_ARG_MAX is 4096, which is the lowest possible
+ // value for ARG_MAX on a POSIX compliant system.
+ static long ArgMin = _POSIX_ARG_MAX;
+
+ // This the same baseline used by xargs.
+ long EffectiveArgMax = 128 * 1024;
+
+ if (EffectiveArgMax > ArgMax)
+ EffectiveArgMax = ArgMax;
+ else if (EffectiveArgMax < ArgMin)
+ EffectiveArgMax = ArgMin;
+
+ // System says no practical limit.
+ if (ArgMax == -1)
+ return true;
+
+ // Conservatively account for space required by environment variables.
+ long HalfArgMax = EffectiveArgMax / 2;
+
+ size_t ArgLength = Program.size() + 1;
+ for (StringRef Arg : Args) {
+ // Ensure that we do not exceed the MAX_ARG_STRLEN constant on Linux, which
+ // does not have a constant unlike what the man pages would have you
+ // believe. Since this limit is pretty high, perform the check
+ // unconditionally rather than trying to be aggressive and limiting it to
+ // Linux only.
+ if (Arg.size() >= (32 * 4096))
+ return false;
+
+ ArgLength += Arg.size() + 1;
+ if (ArgLength > size_t(HalfArgMax)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+}
diff --git a/llvm/lib/Support/Unix/README.txt b/llvm/lib/Support/Unix/README.txt
new file mode 100644
index 000000000000..3d547c2990d5
--- /dev/null
+++ b/llvm/lib/Support/Unix/README.txt
@@ -0,0 +1,16 @@
+llvm/lib/Support/Unix README
+===========================
+
+This directory provides implementations of the lib/System classes that
+are common to two or more variants of UNIX. For example, the directory
+structure underneath this directory could look like this:
+
+Unix - only code that is truly generic to all UNIX platforms
+ Posix - code that is specific to Posix variants of UNIX
+ SUS - code that is specific to the Single Unix Specification
+ SysV - code that is specific to System V variants of UNIX
+
+As a rule, only those directories actually needing to be created should be
+created. Also, further subdirectories could be created to reflect versions of
+the various standards. For example, under SUS there could be v1, v2, and v3
+subdirectories to reflect the three major versions of SUS.
diff --git a/llvm/lib/Support/Unix/Signals.inc b/llvm/lib/Support/Unix/Signals.inc
new file mode 100644
index 000000000000..5e0cde4a81ed
--- /dev/null
+++ b/llvm/lib/Support/Unix/Signals.inc
@@ -0,0 +1,632 @@
+//===- Signals.cpp - Generic Unix Signals Implementation -----*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines some helpful functions for dealing with the possibility of
+// Unix signals occurring while your program is running.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is extremely careful to only do signal-safe things while in a
+// signal handler. In particular, memory allocation and acquiring a mutex
+// while in a signal handler should never occur. ManagedStatic isn't usable from
+// a signal handler for 2 reasons:
+//
+// 1. Creating a new one allocates.
+// 2. The signal handler could fire while llvm_shutdown is being processed, in
+// which case the ManagedStatic is in an unknown state because it could
+// already have been destroyed, or be in the process of being destroyed.
+//
+// Modifying the behavior of the signal handlers (such as registering new ones)
+// can acquire a mutex, but all this guarantees is that the signal handler
+// behavior is only modified by one thread at a time. A signal handler can still
+// fire while this occurs!
+//
+// Adding work to a signal handler requires lock-freedom (and assume atomics are
+// always lock-free) because the signal handler could fire while new work is
+// being added.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Config/config.h"
+#include "llvm/Demangle/Demangle.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/SaveAndRestore.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <string>
+#include <sysexits.h>
+#ifdef HAVE_BACKTRACE
+# include BACKTRACE_HEADER // For backtrace().
+#endif
+#if HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
+#if HAVE_MACH_MACH_H
+#include <mach/mach.h>
+#endif
+#if HAVE_LINK_H
+#include <link.h>
+#endif
+#ifdef HAVE__UNWIND_BACKTRACE
+// FIXME: We should be able to use <unwind.h> for any target that has an
+// _Unwind_Backtrace function, but on FreeBSD the configure test passes
+// despite the function not existing, and on Android, <unwind.h> conflicts
+// with <link.h>.
+#ifdef __GLIBC__
+#include <unwind.h>
+#else
+#undef HAVE__UNWIND_BACKTRACE
+#endif
+#endif
+
+using namespace llvm;
+
+static RETSIGTYPE SignalHandler(int Sig); // defined below.
+static RETSIGTYPE InfoSignalHandler(int Sig); // defined below.
+
+static void DefaultPipeSignalFunction() {
+ exit(EX_IOERR);
+}
+
+using SignalHandlerFunctionType = void (*)();
+/// The function to call if ctrl-c is pressed.
+static std::atomic<SignalHandlerFunctionType> InterruptFunction =
+ ATOMIC_VAR_INIT(nullptr);
+static std::atomic<SignalHandlerFunctionType> InfoSignalFunction =
+ ATOMIC_VAR_INIT(nullptr);
+static std::atomic<SignalHandlerFunctionType> PipeSignalFunction =
+ ATOMIC_VAR_INIT(DefaultPipeSignalFunction);
+
+namespace {
+/// Signal-safe removal of files.
+/// Inserting and erasing from the list isn't signal-safe, but removal of files
+/// themselves is signal-safe. Memory is freed when the head is freed, deletion
+/// is therefore not signal-safe either.
+class FileToRemoveList {
+ std::atomic<char *> Filename = ATOMIC_VAR_INIT(nullptr);
+ std::atomic<FileToRemoveList *> Next = ATOMIC_VAR_INIT(nullptr);
+
+ FileToRemoveList() = default;
+ // Not signal-safe.
+ FileToRemoveList(const std::string &str) : Filename(strdup(str.c_str())) {}
+
+public:
+ // Not signal-safe.
+ ~FileToRemoveList() {
+ if (FileToRemoveList *N = Next.exchange(nullptr))
+ delete N;
+ if (char *F = Filename.exchange(nullptr))
+ free(F);
+ }
+
+ // Not signal-safe.
+ static void insert(std::atomic<FileToRemoveList *> &Head,
+ const std::string &Filename) {
+ // Insert the new file at the end of the list.
+ FileToRemoveList *NewHead = new FileToRemoveList(Filename);
+ std::atomic<FileToRemoveList *> *InsertionPoint = &Head;
+ FileToRemoveList *OldHead = nullptr;
+ while (!InsertionPoint->compare_exchange_strong(OldHead, NewHead)) {
+ InsertionPoint = &OldHead->Next;
+ OldHead = nullptr;
+ }
+ }
+
+ // Not signal-safe.
+ static void erase(std::atomic<FileToRemoveList *> &Head,
+ const std::string &Filename) {
+ // Use a lock to avoid concurrent erase: the comparison would access
+ // free'd memory.
+ static ManagedStatic<sys::SmartMutex<true>> Lock;
+ sys::SmartScopedLock<true> Writer(*Lock);
+
+ for (FileToRemoveList *Current = Head.load(); Current;
+ Current = Current->Next.load()) {
+ if (char *OldFilename = Current->Filename.load()) {
+ if (OldFilename != Filename)
+ continue;
+ // Leave an empty filename.
+ OldFilename = Current->Filename.exchange(nullptr);
+ // The filename might have become null between the time we
+ // compared it and we exchanged it.
+ if (OldFilename)
+ free(OldFilename);
+ }
+ }
+ }
+
+ // Signal-safe.
+ static void removeAllFiles(std::atomic<FileToRemoveList *> &Head) {
+ // If cleanup were to occur while we're removing files we'd have a bad time.
+ // Make sure we're OK by preventing cleanup from doing anything while we're
+ // removing files. If cleanup races with us and we win we'll have a leak,
+ // but we won't crash.
+ FileToRemoveList *OldHead = Head.exchange(nullptr);
+
+ for (FileToRemoveList *currentFile = OldHead; currentFile;
+ currentFile = currentFile->Next.load()) {
+ // If erasing was occuring while we're trying to remove files we'd look
+ // at free'd data. Take away the path and put it back when done.
+ if (char *path = currentFile->Filename.exchange(nullptr)) {
+ // Get the status so we can determine if it's a file or directory. If we
+ // can't stat the file, ignore it.
+ struct stat buf;
+ if (stat(path, &buf) != 0)
+ continue;
+
+ // If this is not a regular file, ignore it. We want to prevent removal
+ // of special files like /dev/null, even if the compiler is being run
+ // with the super-user permissions.
+ if (!S_ISREG(buf.st_mode))
+ continue;
+
+ // Otherwise, remove the file. We ignore any errors here as there is
+ // nothing else we can do.
+ unlink(path);
+
+ // We're done removing the file, erasing can safely proceed.
+ currentFile->Filename.exchange(path);
+ }
+ }
+
+ // We're done removing files, cleanup can safely proceed.
+ Head.exchange(OldHead);
+ }
+};
+static std::atomic<FileToRemoveList *> FilesToRemove = ATOMIC_VAR_INIT(nullptr);
+
+/// Clean up the list in a signal-friendly manner.
+/// Recall that signals can fire during llvm_shutdown. If this occurs we should
+/// either clean something up or nothing at all, but we shouldn't crash!
+struct FilesToRemoveCleanup {
+ // Not signal-safe.
+ ~FilesToRemoveCleanup() {
+ FileToRemoveList *Head = FilesToRemove.exchange(nullptr);
+ if (Head)
+ delete Head;
+ }
+};
+} // namespace
+
+static StringRef Argv0;
+
+/// Signals that represent requested termination. There's no bug or failure, or
+/// if there is, it's not our direct responsibility. For whatever reason, our
+/// continued execution is no longer desirable.
+static const int IntSigs[] = {
+ SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR2
+};
+
+/// Signals that represent that we have a bug, and our prompt termination has
+/// been ordered.
+static const int KillSigs[] = {
+ SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGQUIT
+#ifdef SIGSYS
+ , SIGSYS
+#endif
+#ifdef SIGXCPU
+ , SIGXCPU
+#endif
+#ifdef SIGXFSZ
+ , SIGXFSZ
+#endif
+#ifdef SIGEMT
+ , SIGEMT
+#endif
+};
+
+/// Signals that represent requests for status.
+static const int InfoSigs[] = {
+ SIGUSR1
+#ifdef SIGINFO
+ , SIGINFO
+#endif
+};
+
+static const size_t NumSigs =
+ array_lengthof(IntSigs) + array_lengthof(KillSigs) +
+ array_lengthof(InfoSigs);
+
+
+static std::atomic<unsigned> NumRegisteredSignals = ATOMIC_VAR_INIT(0);
+static struct {
+ struct sigaction SA;
+ int SigNo;
+} RegisteredSignalInfo[NumSigs];
+
+#if defined(HAVE_SIGALTSTACK)
+// Hold onto both the old and new alternate signal stack so that it's not
+// reported as a leak. We don't make any attempt to remove our alt signal
+// stack if we remove our signal handlers; that can't be done reliably if
+// someone else is also trying to do the same thing.
+static stack_t OldAltStack;
+static void* NewAltStackPointer;
+
+static void CreateSigAltStack() {
+ const size_t AltStackSize = MINSIGSTKSZ + 64 * 1024;
+
+ // If we're executing on the alternate stack, or we already have an alternate
+ // signal stack that we're happy with, there's nothing for us to do. Don't
+ // reduce the size, some other part of the process might need a larger stack
+ // than we do.
+ if (sigaltstack(nullptr, &OldAltStack) != 0 ||
+ OldAltStack.ss_flags & SS_ONSTACK ||
+ (OldAltStack.ss_sp && OldAltStack.ss_size >= AltStackSize))
+ return;
+
+ stack_t AltStack = {};
+ AltStack.ss_sp = static_cast<char *>(safe_malloc(AltStackSize));
+ NewAltStackPointer = AltStack.ss_sp; // Save to avoid reporting a leak.
+ AltStack.ss_size = AltStackSize;
+ if (sigaltstack(&AltStack, &OldAltStack) != 0)
+ free(AltStack.ss_sp);
+}
+#else
+static void CreateSigAltStack() {}
+#endif
+
+static void RegisterHandlers() { // Not signal-safe.
+ // The mutex prevents other threads from registering handlers while we're
+ // doing it. We also have to protect the handlers and their count because
+ // a signal handler could fire while we're registeting handlers.
+ static ManagedStatic<sys::SmartMutex<true>> SignalHandlerRegistrationMutex;
+ sys::SmartScopedLock<true> Guard(*SignalHandlerRegistrationMutex);
+
+ // If the handlers are already registered, we're done.
+ if (NumRegisteredSignals.load() != 0)
+ return;
+
+ // Create an alternate stack for signal handling. This is necessary for us to
+ // be able to reliably handle signals due to stack overflow.
+ CreateSigAltStack();
+
+ enum class SignalKind { IsKill, IsInfo };
+ auto registerHandler = [&](int Signal, SignalKind Kind) {
+ unsigned Index = NumRegisteredSignals.load();
+ assert(Index < array_lengthof(RegisteredSignalInfo) &&
+ "Out of space for signal handlers!");
+
+ struct sigaction NewHandler;
+
+ switch (Kind) {
+ case SignalKind::IsKill:
+ NewHandler.sa_handler = SignalHandler;
+ NewHandler.sa_flags = SA_NODEFER | SA_RESETHAND | SA_ONSTACK;
+ break;
+ case SignalKind::IsInfo:
+ NewHandler.sa_handler = InfoSignalHandler;
+ NewHandler.sa_flags = SA_ONSTACK;
+ break;
+ }
+ sigemptyset(&NewHandler.sa_mask);
+
+ // Install the new handler, save the old one in RegisteredSignalInfo.
+ sigaction(Signal, &NewHandler, &RegisteredSignalInfo[Index].SA);
+ RegisteredSignalInfo[Index].SigNo = Signal;
+ ++NumRegisteredSignals;
+ };
+
+ for (auto S : IntSigs)
+ registerHandler(S, SignalKind::IsKill);
+ for (auto S : KillSigs)
+ registerHandler(S, SignalKind::IsKill);
+ for (auto S : InfoSigs)
+ registerHandler(S, SignalKind::IsInfo);
+}
+
+static void UnregisterHandlers() {
+ // Restore all of the signal handlers to how they were before we showed up.
+ for (unsigned i = 0, e = NumRegisteredSignals.load(); i != e; ++i) {
+ sigaction(RegisteredSignalInfo[i].SigNo,
+ &RegisteredSignalInfo[i].SA, nullptr);
+ --NumRegisteredSignals;
+ }
+}
+
+/// Process the FilesToRemove list.
+static void RemoveFilesToRemove() {
+ FileToRemoveList::removeAllFiles(FilesToRemove);
+}
+
+// The signal handler that runs.
+static RETSIGTYPE SignalHandler(int Sig) {
+ // Restore the signal behavior to default, so that the program actually
+ // crashes when we return and the signal reissues. This also ensures that if
+ // we crash in our signal handler that the program will terminate immediately
+ // instead of recursing in the signal handler.
+ UnregisterHandlers();
+
+ // Unmask all potentially blocked kill signals.
+ sigset_t SigMask;
+ sigfillset(&SigMask);
+ sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
+
+ {
+ RemoveFilesToRemove();
+
+ if (std::find(std::begin(IntSigs), std::end(IntSigs), Sig)
+ != std::end(IntSigs)) {
+ if (auto OldInterruptFunction = InterruptFunction.exchange(nullptr))
+ return OldInterruptFunction();
+
+ // Send a special return code that drivers can check for, from sysexits.h.
+ if (Sig == SIGPIPE)
+ if (SignalHandlerFunctionType CurrentPipeFunction = PipeSignalFunction)
+ CurrentPipeFunction();
+
+ raise(Sig); // Execute the default handler.
+ return;
+ }
+ }
+
+ // Otherwise if it is a fault (like SEGV) run any handler.
+ llvm::sys::RunSignalHandlers();
+
+#ifdef __s390__
+ // On S/390, certain signals are delivered with PSW Address pointing to
+ // *after* the faulting instruction. Simply returning from the signal
+ // handler would continue execution after that point, instead of
+ // re-raising the signal. Raise the signal manually in those cases.
+ if (Sig == SIGILL || Sig == SIGFPE || Sig == SIGTRAP)
+ raise(Sig);
+#endif
+}
+
+static RETSIGTYPE InfoSignalHandler(int Sig) {
+ SaveAndRestore<int> SaveErrnoDuringASignalHandler(errno);
+ if (SignalHandlerFunctionType CurrentInfoFunction = InfoSignalFunction)
+ CurrentInfoFunction();
+}
+
+void llvm::sys::RunInterruptHandlers() {
+ RemoveFilesToRemove();
+}
+
+void llvm::sys::SetInterruptFunction(void (*IF)()) {
+ InterruptFunction.exchange(IF);
+ RegisterHandlers();
+}
+
+void llvm::sys::SetInfoSignalFunction(void (*Handler)()) {
+ InfoSignalFunction.exchange(Handler);
+ RegisterHandlers();
+}
+
+void llvm::sys::SetPipeSignalFunction(void (*Handler)()) {
+ PipeSignalFunction.exchange(Handler);
+ RegisterHandlers();
+}
+
+// The public API
+bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
+ std::string* ErrMsg) {
+ // Ensure that cleanup will occur as soon as one file is added.
+ static ManagedStatic<FilesToRemoveCleanup> FilesToRemoveCleanup;
+ *FilesToRemoveCleanup;
+ FileToRemoveList::insert(FilesToRemove, Filename.str());
+ RegisterHandlers();
+ return false;
+}
+
+// The public API
+void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
+ FileToRemoveList::erase(FilesToRemove, Filename.str());
+}
+
+/// Add a function to be called when a signal is delivered to the process. The
+/// handler can have a cookie passed to it to identify what instance of the
+/// handler it is.
+void llvm::sys::AddSignalHandler(sys::SignalHandlerCallback FnPtr,
+ void *Cookie) { // Signal-safe.
+ insertSignalHandler(FnPtr, Cookie);
+ RegisterHandlers();
+}
+
+#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && HAVE_LINK_H && \
+ (defined(__linux__) || defined(__FreeBSD__) || \
+ defined(__FreeBSD_kernel__) || defined(__NetBSD__))
+struct DlIteratePhdrData {
+ void **StackTrace;
+ int depth;
+ bool first;
+ const char **modules;
+ intptr_t *offsets;
+ const char *main_exec_name;
+};
+
+static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
+ DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
+ const char *name = data->first ? data->main_exec_name : info->dlpi_name;
+ data->first = false;
+ for (int i = 0; i < info->dlpi_phnum; i++) {
+ const auto *phdr = &info->dlpi_phdr[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+ intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
+ intptr_t end = beg + phdr->p_memsz;
+ for (int j = 0; j < data->depth; j++) {
+ if (data->modules[j])
+ continue;
+ intptr_t addr = (intptr_t)data->StackTrace[j];
+ if (beg <= addr && addr < end) {
+ data->modules[j] = name;
+ data->offsets[j] = addr - info->dlpi_addr;
+ }
+ }
+ }
+ return 0;
+}
+
+/// If this is an ELF platform, we can find all loaded modules and their virtual
+/// addresses with dl_iterate_phdr.
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+ const char **Modules, intptr_t *Offsets,
+ const char *MainExecutableName,
+ StringSaver &StrPool) {
+ DlIteratePhdrData data = {StackTrace, Depth, true,
+ Modules, Offsets, MainExecutableName};
+ dl_iterate_phdr(dl_iterate_phdr_cb, &data);
+ return true;
+}
+#else
+/// This platform does not have dl_iterate_phdr, so we do not yet know how to
+/// find all loaded DSOs.
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+ const char **Modules, intptr_t *Offsets,
+ const char *MainExecutableName,
+ StringSaver &StrPool) {
+ return false;
+}
+#endif // defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES && ...
+
+#if ENABLE_BACKTRACES && defined(HAVE__UNWIND_BACKTRACE)
+static int unwindBacktrace(void **StackTrace, int MaxEntries) {
+ if (MaxEntries < 0)
+ return 0;
+
+ // Skip the first frame ('unwindBacktrace' itself).
+ int Entries = -1;
+
+ auto HandleFrame = [&](_Unwind_Context *Context) -> _Unwind_Reason_Code {
+ // Apparently we need to detect reaching the end of the stack ourselves.
+ void *IP = (void *)_Unwind_GetIP(Context);
+ if (!IP)
+ return _URC_END_OF_STACK;
+
+ assert(Entries < MaxEntries && "recursively called after END_OF_STACK?");
+ if (Entries >= 0)
+ StackTrace[Entries] = IP;
+
+ if (++Entries == MaxEntries)
+ return _URC_END_OF_STACK;
+ return _URC_NO_REASON;
+ };
+
+ _Unwind_Backtrace(
+ [](_Unwind_Context *Context, void *Handler) {
+ return (*static_cast<decltype(HandleFrame) *>(Handler))(Context);
+ },
+ static_cast<void *>(&HandleFrame));
+ return std::max(Entries, 0);
+}
+#endif
+
+// In the case of a program crash or fault, print out a stack trace so that the
+// user has an indication of why and where we died.
+//
+// On glibc systems we have the 'backtrace' function, which works nicely, but
+// doesn't demangle symbols.
+void llvm::sys::PrintStackTrace(raw_ostream &OS) {
+#if ENABLE_BACKTRACES
+ static void *StackTrace[256];
+ int depth = 0;
+#if defined(HAVE_BACKTRACE)
+ // Use backtrace() to output a backtrace on Linux systems with glibc.
+ if (!depth)
+ depth = backtrace(StackTrace, static_cast<int>(array_lengthof(StackTrace)));
+#endif
+#if defined(HAVE__UNWIND_BACKTRACE)
+ // Try _Unwind_Backtrace() if backtrace() failed.
+ if (!depth)
+ depth = unwindBacktrace(StackTrace,
+ static_cast<int>(array_lengthof(StackTrace)));
+#endif
+ if (!depth)
+ return;
+
+ if (printSymbolizedStackTrace(Argv0, StackTrace, depth, OS))
+ return;
+#if HAVE_DLFCN_H && HAVE_DLADDR
+ int width = 0;
+ for (int i = 0; i < depth; ++i) {
+ Dl_info dlinfo;
+ dladdr(StackTrace[i], &dlinfo);
+ const char* name = strrchr(dlinfo.dli_fname, '/');
+
+ int nwidth;
+ if (!name) nwidth = strlen(dlinfo.dli_fname);
+ else nwidth = strlen(name) - 1;
+
+ if (nwidth > width) width = nwidth;
+ }
+
+ for (int i = 0; i < depth; ++i) {
+ Dl_info dlinfo;
+ dladdr(StackTrace[i], &dlinfo);
+
+ OS << format("%-2d", i);
+
+ const char* name = strrchr(dlinfo.dli_fname, '/');
+ if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
+ else OS << format(" %-*s", width, name+1);
+
+ OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
+ (unsigned long)StackTrace[i]);
+
+ if (dlinfo.dli_sname != nullptr) {
+ OS << ' ';
+ int res;
+ char* d = itaniumDemangle(dlinfo.dli_sname, nullptr, nullptr, &res);
+ if (!d) OS << dlinfo.dli_sname;
+ else OS << d;
+ free(d);
+
+ OS << format(" + %tu", (static_cast<const char*>(StackTrace[i])-
+ static_cast<const char*>(dlinfo.dli_saddr)));
+ }
+ OS << '\n';
+ }
+#elif defined(HAVE_BACKTRACE)
+ backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
+#endif
+#endif
+}
+
+static void PrintStackTraceSignalHandler(void *) {
+ sys::PrintStackTrace(llvm::errs());
+}
+
+void llvm::sys::DisableSystemDialogsOnCrash() {}
+
+/// When an error signal (such as SIGABRT or SIGSEGV) is delivered to the
+/// process, print a stack trace and then exit.
+void llvm::sys::PrintStackTraceOnErrorSignal(StringRef Argv0,
+ bool DisableCrashReporting) {
+ ::Argv0 = Argv0;
+
+ AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
+
+#if defined(__APPLE__) && ENABLE_CRASH_OVERRIDES
+ // Environment variable to disable any kind of crash dialog.
+ if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
+ mach_port_t self = mach_task_self();
+
+ exception_mask_t mask = EXC_MASK_CRASH;
+
+ kern_return_t ret = task_set_exception_ports(self,
+ mask,
+ MACH_PORT_NULL,
+ EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES,
+ THREAD_STATE_NONE);
+ (void)ret;
+ }
+#endif
+}
diff --git a/llvm/lib/Support/Unix/ThreadLocal.inc b/llvm/lib/Support/Unix/ThreadLocal.inc
new file mode 100644
index 000000000000..a402ae980424
--- /dev/null
+++ b/llvm/lib/Support/Unix/ThreadLocal.inc
@@ -0,0 +1,70 @@
+//=== llvm/Support/Unix/ThreadLocal.inc - Unix Thread Local Data -*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix specific (non-pthread) ThreadLocal class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+
+#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC)
+
+#include <cassert>
+#include <pthread.h>
+#include <stdlib.h>
+
+namespace llvm {
+using namespace sys;
+
+ThreadLocalImpl::ThreadLocalImpl() : data() {
+ static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big");
+ pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+ int errorcode = pthread_key_create(key, nullptr);
+ assert(errorcode == 0);
+ (void) errorcode;
+}
+
+ThreadLocalImpl::~ThreadLocalImpl() {
+ pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+ int errorcode = pthread_key_delete(*key);
+ assert(errorcode == 0);
+ (void) errorcode;
+}
+
+void ThreadLocalImpl::setInstance(const void* d) {
+ pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+ int errorcode = pthread_setspecific(*key, d);
+ assert(errorcode == 0);
+ (void) errorcode;
+}
+
+void *ThreadLocalImpl::getInstance() {
+ pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
+ return pthread_getspecific(*key);
+}
+
+void ThreadLocalImpl::removeInstance() {
+ setInstance(nullptr);
+}
+
+}
+#else
+namespace llvm {
+using namespace sys;
+ThreadLocalImpl::ThreadLocalImpl() : data() { }
+ThreadLocalImpl::~ThreadLocalImpl() { }
+void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
+void *ThreadLocalImpl::getInstance() { return data; }
+void ThreadLocalImpl::removeInstance() { setInstance(0); }
+}
+#endif
diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
new file mode 100644
index 000000000000..ed9a96563055
--- /dev/null
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -0,0 +1,258 @@
+//===- Unix/Threading.inc - Unix Threading Implementation ----- -*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Unix specific implementation of Threading functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+
+#if defined(__APPLE__)
+#include <mach/mach_init.h>
+#include <mach/mach_port.h>
+#endif
+
+#include <pthread.h>
+
+#if defined(__FreeBSD__) || defined(__OpenBSD__)
+#include <pthread_np.h> // For pthread_getthreadid_np() / pthread_set_name_np()
+#endif
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#include <errno.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <unistd.h>
+#endif
+
+#if defined(__NetBSD__)
+#include <lwp.h> // For _lwp_self()
+#endif
+
+#if defined(__linux__)
+#include <sys/syscall.h> // For syscall codes
+#include <unistd.h> // For syscall()
+#endif
+
+namespace {
+ struct ThreadInfo {
+ void(*UserFn)(void *);
+ void *UserData;
+ };
+}
+
+static void *ExecuteOnThread_Dispatch(void *Arg) {
+ ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
+ TI->UserFn(TI->UserData);
+ return nullptr;
+}
+
+void llvm::llvm_execute_on_thread(void(*Fn)(void*), void *UserData,
+ unsigned RequestedStackSize) {
+ ThreadInfo Info = { Fn, UserData };
+ pthread_attr_t Attr;
+ pthread_t Thread;
+
+ // Construct the attributes object.
+ if (::pthread_attr_init(&Attr) != 0)
+ return;
+
+ // Set the requested stack size, if given.
+ if (RequestedStackSize != 0) {
+ if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
+ goto error;
+ }
+
+ // Construct and execute the thread.
+ if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
+ goto error;
+
+ // Wait for the thread and clean up.
+ ::pthread_join(Thread, nullptr);
+
+error:
+ ::pthread_attr_destroy(&Attr);
+}
+
+
+uint64_t llvm::get_threadid() {
+#if defined(__APPLE__)
+ // Calling "mach_thread_self()" bumps the reference count on the thread
+ // port, so we need to deallocate it. mach_task_self() doesn't bump the ref
+ // count.
+ thread_port_t Self = mach_thread_self();
+ mach_port_deallocate(mach_task_self(), Self);
+ return Self;
+#elif defined(__FreeBSD__)
+ return uint64_t(pthread_getthreadid_np());
+#elif defined(__NetBSD__)
+ return uint64_t(_lwp_self());
+#elif defined(__ANDROID__)
+ return uint64_t(gettid());
+#elif defined(__linux__)
+ return uint64_t(syscall(SYS_gettid));
+#else
+ return uint64_t(pthread_self());
+#endif
+}
+
+
+static constexpr uint32_t get_max_thread_name_length_impl() {
+#if defined(__NetBSD__)
+ return PTHREAD_MAX_NAMELEN_NP;
+#elif defined(__APPLE__)
+ return 64;
+#elif defined(__linux__)
+#if HAVE_PTHREAD_SETNAME_NP
+ return 16;
+#else
+ return 0;
+#endif
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+ return 16;
+#elif defined(__OpenBSD__)
+ return 32;
+#else
+ return 0;
+#endif
+}
+
+uint32_t llvm::get_max_thread_name_length() {
+ return get_max_thread_name_length_impl();
+}
+
+void llvm::set_thread_name(const Twine &Name) {
+ // Make sure the input is null terminated.
+ SmallString<64> Storage;
+ StringRef NameStr = Name.toNullTerminatedStringRef(Storage);
+
+ // Truncate from the beginning, not the end, if the specified name is too
+ // long. For one, this ensures that the resulting string is still null
+ // terminated, but additionally the end of a long thread name will usually
+ // be more unique than the beginning, since a common pattern is for similar
+ // threads to share a common prefix.
+ // Note that the name length includes the null terminator.
+ if (get_max_thread_name_length() > 0)
+ NameStr = NameStr.take_back(get_max_thread_name_length() - 1);
+ (void)NameStr;
+#if defined(__linux__)
+#if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
+#if HAVE_PTHREAD_SETNAME_NP
+ ::pthread_setname_np(::pthread_self(), NameStr.data());
+#endif
+#endif
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+ ::pthread_set_name_np(::pthread_self(), NameStr.data());
+#elif defined(__NetBSD__)
+ ::pthread_setname_np(::pthread_self(), "%s",
+ const_cast<char *>(NameStr.data()));
+#elif defined(__APPLE__)
+ ::pthread_setname_np(NameStr.data());
+#endif
+}
+
+void llvm::get_thread_name(SmallVectorImpl<char> &Name) {
+ Name.clear();
+
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+ int pid = ::getpid();
+ uint64_t tid = get_threadid();
+
+ struct kinfo_proc *kp = nullptr, *nkp;
+ size_t len = 0;
+ int error;
+ int ctl[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID | KERN_PROC_INC_THREAD,
+ (int)pid };
+
+ while (1) {
+ error = sysctl(ctl, 4, kp, &len, nullptr, 0);
+ if (kp == nullptr || (error != 0 && errno == ENOMEM)) {
+ // Add extra space in case threads are added before next call.
+ len += sizeof(*kp) + len / 10;
+ nkp = (struct kinfo_proc *)::realloc(kp, len);
+ if (nkp == nullptr) {
+ free(kp);
+ return;
+ }
+ kp = nkp;
+ continue;
+ }
+ if (error != 0)
+ len = 0;
+ break;
+ }
+
+ for (size_t i = 0; i < len / sizeof(*kp); i++) {
+ if (kp[i].ki_tid == (lwpid_t)tid) {
+ Name.append(kp[i].ki_tdname, kp[i].ki_tdname + strlen(kp[i].ki_tdname));
+ break;
+ }
+ }
+ free(kp);
+ return;
+#elif defined(__NetBSD__)
+ constexpr uint32_t len = get_max_thread_name_length_impl();
+ char buf[len];
+ ::pthread_getname_np(::pthread_self(), buf, len);
+
+ Name.append(buf, buf + strlen(buf));
+#elif defined(__OpenBSD__)
+ constexpr uint32_t len = get_max_thread_name_length_impl();
+ char buf[len];
+ ::pthread_get_name_np(::pthread_self(), buf, len);
+
+ Name.append(buf, buf + strlen(buf));
+#elif defined(__linux__)
+#if HAVE_PTHREAD_GETNAME_NP
+ constexpr uint32_t len = get_max_thread_name_length_impl();
+ char Buffer[len] = {'\0'}; // FIXME: working around MSan false positive.
+ if (0 == ::pthread_getname_np(::pthread_self(), Buffer, len))
+ Name.append(Buffer, Buffer + strlen(Buffer));
+#endif
+#endif
+}
+
+SetThreadPriorityResult llvm::set_thread_priority(ThreadPriority Priority) {
+#if defined(__linux__) && defined(SCHED_IDLE)
+ // Some *really* old glibcs are missing SCHED_IDLE.
+ // http://man7.org/linux/man-pages/man3/pthread_setschedparam.3.html
+ // http://man7.org/linux/man-pages/man2/sched_setscheduler.2.html
+ sched_param priority;
+ // For each of the above policies, param->sched_priority must be 0.
+ priority.sched_priority = 0;
+ // SCHED_IDLE for running very low priority background jobs.
+ // SCHED_OTHER the standard round-robin time-sharing policy;
+ return !pthread_setschedparam(
+ pthread_self(),
+ Priority == ThreadPriority::Background ? SCHED_IDLE : SCHED_OTHER,
+ &priority)
+ ? SetThreadPriorityResult::SUCCESS
+ : SetThreadPriorityResult::FAILURE;
+#elif defined(__APPLE__)
+ // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getpriority.2.html
+ // When setting a thread into background state the scheduling priority is set
+ // to lowest value, disk and network IO are throttled. Network IO will be
+ // throttled for any sockets the thread opens after going into background
+ // state. Any previously opened sockets are not affected.
+
+ // https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getiopolicy_np.3.html
+ // I/Os with THROTTLE policy are called THROTTLE I/Os. If a THROTTLE I/O
+ // request occurs within a small time window (usually a fraction of a second)
+ // of another NORMAL I/O request, the thread that issues the THROTTLE I/O is
+ // forced to sleep for a certain interval. This slows down the thread that
+ // issues the THROTTLE I/O so that NORMAL I/Os can utilize most of the disk
+ // I/O bandwidth.
+ return !setpriority(PRIO_DARWIN_THREAD, 0,
+ Priority == ThreadPriority::Background ? PRIO_DARWIN_BG
+ : 0)
+ ? SetThreadPriorityResult::SUCCESS
+ : SetThreadPriorityResult::FAILURE;
+#endif
+ return SetThreadPriorityResult::FAILURE;
+}
diff --git a/llvm/lib/Support/Unix/Unix.h b/llvm/lib/Support/Unix/Unix.h
new file mode 100644
index 000000000000..86309b0567f5
--- /dev/null
+++ b/llvm/lib/Support/Unix/Unix.h
@@ -0,0 +1,105 @@
+//===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines things specific to Unix implementations.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H
+#define LLVM_LIB_SUPPORT_UNIX_UNIX_H
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on all UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+#include "llvm/Support/Chrono.h"
+#include "llvm/Support/Errno.h"
+#include <algorithm>
+#include <assert.h>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <time.h>
+
+#ifdef HAVE_DLFCN_H
+# include <dlfcn.h>
+#endif
+
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+/// This function builds an error message into \p ErrMsg using the \p prefix
+/// string and the Unix error number given by \p errnum. If errnum is -1, the
+/// default then the value of errno is used.
+/// Make an error message
+///
+/// If the error number can be converted to a string, it will be
+/// separated from prefix by ": ".
+static inline bool MakeErrMsg(
+ std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
+ if (!ErrMsg)
+ return true;
+ if (errnum == -1)
+ errnum = errno;
+ *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
+ return true;
+}
+
+namespace llvm {
+namespace sys {
+
+/// Convert a struct timeval to a duration. Note that timeval can be used both
+/// as a time point and a duration. Be sure to check what the input represents.
+inline std::chrono::microseconds toDuration(const struct timeval &TV) {
+ return std::chrono::seconds(TV.tv_sec) +
+ std::chrono::microseconds(TV.tv_usec);
+}
+
+/// Convert a time point to struct timespec.
+inline struct timespec toTimeSpec(TimePoint<> TP) {
+ using namespace std::chrono;
+
+ struct timespec RetVal;
+ RetVal.tv_sec = toTimeT(TP);
+ RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
+ return RetVal;
+}
+
+/// Convert a time point to struct timeval.
+inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
+ using namespace std::chrono;
+
+ struct timeval RetVal;
+ RetVal.tv_sec = toTimeT(TP);
+ RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
+ return RetVal;
+}
+
+} // namespace sys
+} // namespace llvm
+
+#endif
diff --git a/llvm/lib/Support/Unix/Watchdog.inc b/llvm/lib/Support/Unix/Watchdog.inc
new file mode 100644
index 000000000000..b363ef779560
--- /dev/null
+++ b/llvm/lib/Support/Unix/Watchdog.inc
@@ -0,0 +1,33 @@
+//===--- Unix/Watchdog.inc - Unix Watchdog Implementation -------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the generic Unix implementation of the Watchdog class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+namespace llvm {
+ namespace sys {
+ Watchdog::Watchdog(unsigned int seconds) {
+#ifdef HAVE_UNISTD_H
+ alarm(seconds);
+#endif
+ }
+
+ Watchdog::~Watchdog() {
+#ifdef HAVE_UNISTD_H
+ alarm(0);
+#endif
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-12 19:38:52 +0000