Restoring authorship annotation for <[email protected]>. Commit 1 of 2.

1 files changed, 554 insertions, 554 deletions

diff --git a/contrib/libs/llvm12/lib/Support/Unix/Program.inc b/contrib/libs/llvm12/lib/Support/Unix/Program.inc
index fb56fa4b0d1..e5a013d3828 100644
--- a/contrib/libs/llvm12/lib/Support/Unix/Program.inc
+++ b/contrib/libs/llvm12/lib/Support/Unix/Program.inc
@@ -1,559 +1,559 @@
-//===- 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 "llvm/Support/Program.h"
-
-#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
-
-using 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 = std::string(*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,
+//===- 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 "llvm/Support/Program.h" 
+ 
+#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 
+ 
+using 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 = std::string(*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,
                     BitVector *AffinityMask) {
-  if (!llvm::sys::fs::exists(Program)) {
-    if (ErrMsg)
-      *ErrMsg = std::string("Executable \"") + Program.str() +
-                std::string("\" doesn't exist!");
-    return false;
-  }
-
+  if (!llvm::sys::fs::exists(Program)) { 
+    if (ErrMsg) 
+      *ErrMsg = std::string("Executable \"") + Program.str() + 
+                std::string("\" doesn't exist!"); 
+    return false; 
+  } 
+ 
   assert(!AffinityMask && "Starting a process with an affinity mask is "
                           "currently not supported on Unix!");
 
-  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] = std::string(*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 = std::string(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 {
-namespace sys {
-
-#ifndef _AIX
-using ::wait4;
-#else
-static pid_t (wait4)(pid_t pid, int *status, int options, struct rusage *usage);
-#endif
-
-} // namespace sys
-} // namespace llvm
-
-#ifdef _AIX
-#ifndef _ALL_SOURCE
-extern "C" pid_t (wait4)(pid_t pid, int *status, int options,
-                         struct rusage *usage);
-#endif
-pid_t (llvm::sys::wait4)(pid_t pid, int *status, int options,
-                         struct rusage *usage) {
-  assert(pid > 0 && "Only expecting to handle actual PID values!");
-  assert((options & ~WNOHANG) == 0 && "Expecting WNOHANG at most!");
-  assert(usage && "Expecting usage collection!");
-
-  // AIX wait4 does not work well with WNOHANG.
-  if (!(options & WNOHANG))
-    return ::wait4(pid, status, options, usage);
-
-  // For WNOHANG, we use waitid (which supports WNOWAIT) until the child process
-  // has terminated.
-  siginfo_t WaitIdInfo;
-  WaitIdInfo.si_pid = 0;
-  int WaitIdRetVal =
-      waitid(P_PID, pid, &WaitIdInfo, WNOWAIT | WEXITED | options);
-
-  if (WaitIdRetVal == -1 || WaitIdInfo.si_pid == 0)
-    return WaitIdRetVal;
-
-  assert(WaitIdInfo.si_pid == pid);
-
-  // The child has already terminated, so a blocking wait on it is okay in the
-  // absence of indiscriminate `wait` calls from the current process (which
-  // would cause the call here to fail with ECHILD).
-  return ::wait4(pid, status, options & ~WNOHANG, usage);
-}
-#endif
-
-ProcessInfo llvm::sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait,
-                            bool WaitUntilTerminates, std::string *ErrMsg,
-                            Optional<ProcessStatistics> *ProcStat) {
-  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);
-    // FIXME The alarm signal may be delivered to another thread.
-    alarm(SecondsToWait);
-  } else if (SecondsToWait == 0)
-    WaitPidOptions = WNOHANG;
-
-  // Parent process: Wait for the child process to terminate.
-  int status;
-  ProcessInfo WaitResult;
-  rusage Info;
-  if (ProcStat)
-    ProcStat->reset();
-
-  do {
-    WaitResult.Pid = sys::wait4(ChildPid, &status, WaitPidOptions, &Info);
-  } 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
-        // FIXME This could grab some other child process out from another
-        // waiting thread and then leave a zombie anyway.
-        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);
-  }
-
-  if (ProcStat) {
-    std::chrono::microseconds UserT = toDuration(Info.ru_utime);
-    std::chrono::microseconds KernelT = toDuration(Info.ru_stime);
-    uint64_t PeakMemory = static_cast<uint64_t>(Info.ru_maxrss);
-    *ProcStat = ProcessStatistics{UserT + KernelT, UserT, PeakMemory};
-  }
-
-  // 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 llvm::sys::ChangeStdinToBinary() {
-  // Do nothing, as Unix doesn't differentiate between text and binary.
-  return std::error_code();
-}
-
-std::error_code llvm::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;
-}
+  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] = std::string(*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 = std::string(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 { 
+namespace sys { 
+ 
+#ifndef _AIX 
+using ::wait4; 
+#else 
+static pid_t (wait4)(pid_t pid, int *status, int options, struct rusage *usage); 
+#endif 
+ 
+} // namespace sys 
+} // namespace llvm 
+ 
+#ifdef _AIX 
+#ifndef _ALL_SOURCE 
+extern "C" pid_t (wait4)(pid_t pid, int *status, int options, 
+                         struct rusage *usage); 
+#endif 
+pid_t (llvm::sys::wait4)(pid_t pid, int *status, int options, 
+                         struct rusage *usage) { 
+  assert(pid > 0 && "Only expecting to handle actual PID values!"); 
+  assert((options & ~WNOHANG) == 0 && "Expecting WNOHANG at most!"); 
+  assert(usage && "Expecting usage collection!"); 
+ 
+  // AIX wait4 does not work well with WNOHANG. 
+  if (!(options & WNOHANG)) 
+    return ::wait4(pid, status, options, usage); 
+ 
+  // For WNOHANG, we use waitid (which supports WNOWAIT) until the child process 
+  // has terminated. 
+  siginfo_t WaitIdInfo; 
+  WaitIdInfo.si_pid = 0; 
+  int WaitIdRetVal = 
+      waitid(P_PID, pid, &WaitIdInfo, WNOWAIT | WEXITED | options); 
+ 
+  if (WaitIdRetVal == -1 || WaitIdInfo.si_pid == 0) 
+    return WaitIdRetVal; 
+ 
+  assert(WaitIdInfo.si_pid == pid); 
+ 
+  // The child has already terminated, so a blocking wait on it is okay in the 
+  // absence of indiscriminate `wait` calls from the current process (which 
+  // would cause the call here to fail with ECHILD). 
+  return ::wait4(pid, status, options & ~WNOHANG, usage); 
+} 
+#endif 
+ 
+ProcessInfo llvm::sys::Wait(const ProcessInfo &PI, unsigned SecondsToWait, 
+                            bool WaitUntilTerminates, std::string *ErrMsg, 
+                            Optional<ProcessStatistics> *ProcStat) { 
+  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); 
+    // FIXME The alarm signal may be delivered to another thread. 
+    alarm(SecondsToWait); 
+  } else if (SecondsToWait == 0) 
+    WaitPidOptions = WNOHANG; 
+ 
+  // Parent process: Wait for the child process to terminate. 
+  int status; 
+  ProcessInfo WaitResult; 
+  rusage Info; 
+  if (ProcStat) 
+    ProcStat->reset(); 
+ 
+  do { 
+    WaitResult.Pid = sys::wait4(ChildPid, &status, WaitPidOptions, &Info); 
+  } 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 
+        // FIXME This could grab some other child process out from another 
+        // waiting thread and then leave a zombie anyway. 
+        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); 
+  } 
+ 
+  if (ProcStat) { 
+    std::chrono::microseconds UserT = toDuration(Info.ru_utime); 
+    std::chrono::microseconds KernelT = toDuration(Info.ru_stime); 
+    uint64_t PeakMemory = static_cast<uint64_t>(Info.ru_maxrss); 
+    *ProcStat = ProcessStatistics{UserT + KernelT, UserT, PeakMemory}; 
+  } 
+ 
+  // 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 llvm::sys::ChangeStdinToBinary() { 
+  // Do nothing, as Unix doesn't differentiate between text and binary. 
+  return std::error_code(); 
+} 
+ 
+std::error_code llvm::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; 
+}