Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

16 files changed, 4900 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.cpp
new file mode 100644
index 00000000000..3cdd2fa575e
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.cpp
@@ -0,0 +1,68 @@
+//===-- CFBundle.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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 1/16/08.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CFBundle.h"
+#include "CFString.h"
+
+// CFBundle constructor
+CFBundle::CFBundle(const char *path)
+    : CFReleaser<CFBundleRef>(), m_bundle_url() {
+  if (path && path[0])
+    SetPath(path);
+}
+
+// CFBundle copy constructor
+CFBundle::CFBundle(const CFBundle &rhs)
+    : CFReleaser<CFBundleRef>(rhs), m_bundle_url(rhs.m_bundle_url) {}
+
+// CFBundle copy constructor
+CFBundle &CFBundle::operator=(const CFBundle &rhs) {
+  *this = rhs;
+  return *this;
+}
+
+// Destructor
+CFBundle::~CFBundle() {}
+
+// Set the path for a bundle by supplying a
+bool CFBundle::SetPath(const char *path) {
+  CFAllocatorRef alloc = kCFAllocatorDefault;
+  // Release our old bundle and ULR
+  reset(); // This class is a CFReleaser<CFBundleRef>
+  m_bundle_url.reset();
+  // Make a CFStringRef from the supplied path
+  CFString cf_path;
+  cf_path.SetFileSystemRepresentation(path);
+  if (cf_path.get()) {
+    // Make our Bundle URL
+    m_bundle_url.reset(::CFURLCreateWithFileSystemPath(
+        alloc, cf_path.get(), kCFURLPOSIXPathStyle, true));
+    if (m_bundle_url.get()) {
+      reset(::CFBundleCreate(alloc, m_bundle_url.get()));
+    }
+  }
+  return get() != NULL;
+}
+
+CFStringRef CFBundle::GetIdentifier() const {
+  CFBundleRef bundle = get();
+  if (bundle != NULL)
+    return ::CFBundleGetIdentifier(bundle);
+  return NULL;
+}
+
+CFURLRef CFBundle::CopyExecutableURL() const {
+  CFBundleRef bundle = get();
+  if (bundle != NULL)
+    return CFBundleCopyExecutableURL(bundle);
+  return NULL;
+}
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.h
new file mode 100644
index 00000000000..f49dc30f1f8
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFBundle.h
@@ -0,0 +1,35 @@
+//===-- CFBundle.h ----------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 1/16/08.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __CFBundle_h__
+#define __CFBundle_h__
+
+#include "CFUtils.h"
+
+class CFBundle : public CFReleaser<CFBundleRef> {
+public:
+  // Constructors and Destructors
+  CFBundle(const char *path = NULL);
+  CFBundle(const CFBundle &rhs);
+  CFBundle &operator=(const CFBundle &rhs);
+  virtual ~CFBundle();
+  bool SetPath(const char *path);
+
+  CFStringRef GetIdentifier() const;
+
+  CFURLRef CopyExecutableURL() const;
+
+protected:
+  CFReleaser<CFURLRef> m_bundle_url;
+};
+
+#endif // #ifndef __CFBundle_h__
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.cpp
new file mode 100644
index 00000000000..4dcc05c8665
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.cpp
@@ -0,0 +1,153 @@
+//===-- CFString.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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 1/16/08.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CFString.h"
+#include <glob.h>
+#include <string>
+
+// CFString constructor
+CFString::CFString(CFStringRef s) : CFReleaser<CFStringRef>(s) {}
+
+// CFString copy constructor
+CFString::CFString(const CFString &rhs) : CFReleaser<CFStringRef>(rhs) {}
+
+// CFString copy constructor
+CFString &CFString::operator=(const CFString &rhs) {
+  if (this != &rhs)
+    *this = rhs;
+  return *this;
+}
+
+CFString::CFString(const char *cstr, CFStringEncoding cstr_encoding)
+    : CFReleaser<CFStringRef>() {
+  if (cstr && cstr[0]) {
+    reset(
+        ::CFStringCreateWithCString(kCFAllocatorDefault, cstr, cstr_encoding));
+  }
+}
+
+// Destructor
+CFString::~CFString() {}
+
+const char *CFString::GetFileSystemRepresentation(std::string &s) {
+  return CFString::FileSystemRepresentation(get(), s);
+}
+
+CFStringRef CFString::SetFileSystemRepresentation(const char *path) {
+  CFStringRef new_value = NULL;
+  if (path && path[0])
+    new_value =
+        ::CFStringCreateWithFileSystemRepresentation(kCFAllocatorDefault, path);
+  reset(new_value);
+  return get();
+}
+
+CFStringRef CFString::SetFileSystemRepresentationFromCFType(CFTypeRef cf_type) {
+  CFStringRef new_value = NULL;
+  if (cf_type != NULL) {
+    CFTypeID cf_type_id = ::CFGetTypeID(cf_type);
+
+    if (cf_type_id == ::CFStringGetTypeID()) {
+      // Retain since we are using the existing object
+      new_value = (CFStringRef)::CFRetain(cf_type);
+    } else if (cf_type_id == ::CFURLGetTypeID()) {
+      new_value =
+          ::CFURLCopyFileSystemPath((CFURLRef)cf_type, kCFURLPOSIXPathStyle);
+    }
+  }
+  reset(new_value);
+  return get();
+}
+
+CFStringRef
+CFString::SetFileSystemRepresentationAndExpandTilde(const char *path) {
+  std::string expanded_path;
+  if (CFString::GlobPath(path, expanded_path))
+    SetFileSystemRepresentation(expanded_path.c_str());
+  else
+    reset();
+  return get();
+}
+
+const char *CFString::UTF8(std::string &str) {
+  return CFString::UTF8(get(), str);
+}
+
+// Static function that puts a copy of the UTF8 contents of CF_STR into STR and
+// returns the C string pointer that is contained in STR when successful, else
+// NULL is returned. This allows the std::string parameter to own the extracted
+// string,
+// and also allows that string to be returned as a C string pointer that can be
+// used.
+
+const char *CFString::UTF8(CFStringRef cf_str, std::string &str) {
+  if (cf_str) {
+    const CFStringEncoding encoding = kCFStringEncodingUTF8;
+    CFIndex max_utf8_str_len = CFStringGetLength(cf_str);
+    max_utf8_str_len =
+        CFStringGetMaximumSizeForEncoding(max_utf8_str_len, encoding);
+    if (max_utf8_str_len > 0) {
+      str.resize(max_utf8_str_len);
+      if (!str.empty()) {
+        if (CFStringGetCString(cf_str, &str[0], str.size(), encoding)) {
+          str.resize(strlen(str.c_str()));
+          return str.c_str();
+        }
+      }
+    }
+  }
+  return NULL;
+}
+
+// Static function that puts a copy of the file system representation of CF_STR
+// into STR and returns the C string pointer that is contained in STR when
+// successful, else NULL is returned. This allows the std::string parameter to
+// own the extracted string, and also allows that string to be returned as a C
+// string pointer that can be used.
+
+const char *CFString::FileSystemRepresentation(CFStringRef cf_str,
+                                               std::string &str) {
+  if (cf_str) {
+    CFIndex max_length =
+        ::CFStringGetMaximumSizeOfFileSystemRepresentation(cf_str);
+    if (max_length > 0) {
+      str.resize(max_length);
+      if (!str.empty()) {
+        if (::CFStringGetFileSystemRepresentation(cf_str, &str[0],
+                                                  str.size())) {
+          str.erase(::strlen(str.c_str()));
+          return str.c_str();
+        }
+      }
+    }
+  }
+  str.erase();
+  return NULL;
+}
+
+CFIndex CFString::GetLength() const {
+  CFStringRef str = get();
+  if (str)
+    return CFStringGetLength(str);
+  return 0;
+}
+
+const char *CFString::GlobPath(const char *path, std::string &expanded_path) {
+  glob_t globbuf;
+  if (::glob(path, GLOB_TILDE, NULL, &globbuf) == 0) {
+    expanded_path = globbuf.gl_pathv[0];
+    ::globfree(&globbuf);
+  } else
+    expanded_path.clear();
+
+  return expanded_path.c_str();
+}
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.h
new file mode 100644
index 00000000000..d1bd5682689
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFString.h
@@ -0,0 +1,40 @@
+//===-- CFString.h ----------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 1/16/08.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __CFString_h__
+#define __CFString_h__
+
+#include "CFUtils.h"
+#include <iosfwd>
+
+class CFString : public CFReleaser<CFStringRef> {
+public:
+  // Constructors and Destructors
+  CFString(CFStringRef cf_str = NULL);
+  CFString(const char *s, CFStringEncoding encoding = kCFStringEncodingUTF8);
+  CFString(const CFString &rhs);
+  CFString &operator=(const CFString &rhs);
+  virtual ~CFString();
+
+  const char *GetFileSystemRepresentation(std::string &str);
+  CFStringRef SetFileSystemRepresentation(const char *path);
+  CFStringRef SetFileSystemRepresentationFromCFType(CFTypeRef cf_type);
+  CFStringRef SetFileSystemRepresentationAndExpandTilde(const char *path);
+  const char *UTF8(std::string &str);
+  CFIndex GetLength() const;
+  static const char *UTF8(CFStringRef cf_str, std::string &str);
+  static const char *FileSystemRepresentation(CFStringRef cf_str,
+                                              std::string &str);
+  static const char *GlobPath(const char *path, std::string &expanded_path);
+};
+
+#endif // #ifndef __CFString_h__
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFUtils.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFUtils.h
new file mode 100644
index 00000000000..b567524ce63
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/CFUtils.h
@@ -0,0 +1,75 @@
+//===-- CFUtils.h -----------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 3/5/07.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __CFUtils_h__
+#define __CFUtils_h__
+
+#include <CoreFoundation/CoreFoundation.h>
+
+#ifdef __cplusplus
+
+// Templatized CF helper class that can own any CF pointer and will
+// call CFRelease() on any valid pointer it owns unless that pointer is
+// explicitly released using the release() member function.
+template <class T> class CFReleaser {
+public:
+  // Type names for the avlue
+  typedef T element_type;
+
+  // Constructors and destructors
+  CFReleaser(T ptr = NULL) : _ptr(ptr) {}
+  CFReleaser(const CFReleaser &copy) : _ptr(copy.get()) {
+    if (get())
+      ::CFRetain(get());
+  }
+  virtual ~CFReleaser() { reset(); }
+
+  // Assignments
+  CFReleaser &operator=(const CFReleaser<T> &copy) {
+    if (copy != *this) {
+      // Replace our owned pointer with the new one
+      reset(copy.get());
+      // Retain the current pointer that we own
+      if (get())
+        ::CFRetain(get());
+    }
+  }
+  // Get the address of the contained type
+  T *ptr_address() { return &_ptr; }
+
+  // Access the pointer itself
+  const T get() const { return _ptr; }
+  T get() { return _ptr; }
+
+  // Set a new value for the pointer and CFRelease our old
+  // value if we had a valid one.
+  void reset(T ptr = NULL) {
+    if (ptr != _ptr) {
+      if (_ptr != NULL)
+        ::CFRelease(_ptr);
+      _ptr = ptr;
+    }
+  }
+
+  // Release ownership without calling CFRelease
+  T release() {
+    T tmp = _ptr;
+    _ptr = NULL;
+    return tmp;
+  }
+
+private:
+  element_type _ptr;
+};
+
+#endif // #ifdef __cplusplus
+#endif // #ifndef __CFUtils_h__
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp
new file mode 100644
index 00000000000..f70ef97a2bc
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp
@@ -0,0 +1,638 @@
+//===-- DarwinProcessLauncher.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
+//
+//===----------------------------------------------------------------------===//
+
+//
+//  DarwinProcessLauncher.cpp
+//  lldb
+//
+//  Created by Todd Fiala on 8/30/16.
+//
+//
+
+#include "DarwinProcessLauncher.h"
+
+// C includes
+#include <spawn.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+
+#ifndef _POSIX_SPAWN_DISABLE_ASLR
+#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
+#endif
+
+// LLDB includes
+#include "lldb/lldb-enumerations.h"
+
+#include "lldb/Host/PseudoTerminal.h"
+#include "lldb/Target/ProcessLaunchInfo.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/Utility/StreamString.h"
+#include "llvm/Support/Errno.h"
+
+#include "CFBundle.h"
+#include "CFString.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+using namespace lldb_private::darwin_process_launcher;
+
+namespace {
+static LaunchFlavor g_launch_flavor = LaunchFlavor::Default;
+}
+
+namespace lldb_private {
+namespace darwin_process_launcher {
+
+static uint32_t GetCPUTypeForLocalProcess(::pid_t pid) {
+  int mib[CTL_MAXNAME] = {
+      0,
+  };
+  size_t len = CTL_MAXNAME;
+  if (::sysctlnametomib("sysctl.proc_cputype", mib, &len))
+    return 0;
+
+  mib[len] = pid;
+  len++;
+
+  cpu_type_t cpu;
+  size_t cpu_len = sizeof(cpu);
+  if (::sysctl(mib, static_cast<u_int>(len), &cpu, &cpu_len, 0, 0))
+    cpu = 0;
+  return cpu;
+}
+
+static bool ResolveExecutablePath(const char *path, char *resolved_path,
+                                  size_t resolved_path_size) {
+  if (path == NULL || path[0] == '\0')
+    return false;
+
+  char max_path[PATH_MAX];
+  std::string result;
+  CFString::GlobPath(path, result);
+
+  if (result.empty())
+    result = path;
+
+  struct stat path_stat;
+  if (::stat(path, &path_stat) == 0) {
+    if ((path_stat.st_mode & S_IFMT) == S_IFDIR) {
+      CFBundle bundle(path);
+      CFReleaser<CFURLRef> url(bundle.CopyExecutableURL());
+      if (url.get()) {
+        if (::CFURLGetFileSystemRepresentation(
+                url.get(), true, (UInt8 *)resolved_path, resolved_path_size))
+          return true;
+      }
+    }
+  }
+
+  if (realpath(path, max_path)) {
+    // Found the path relatively...
+    ::strncpy(resolved_path, max_path, resolved_path_size);
+    return strlen(resolved_path) + 1 < resolved_path_size;
+  } else {
+    // Not a relative path, check the PATH environment variable if the
+    const char *PATH = getenv("PATH");
+    if (PATH) {
+      const char *curr_path_start = PATH;
+      const char *curr_path_end;
+      while (curr_path_start && *curr_path_start) {
+        curr_path_end = strchr(curr_path_start, ':');
+        if (curr_path_end == NULL) {
+          result.assign(curr_path_start);
+          curr_path_start = NULL;
+        } else if (curr_path_end > curr_path_start) {
+          size_t len = curr_path_end - curr_path_start;
+          result.assign(curr_path_start, len);
+          curr_path_start += len + 1;
+        } else
+          break;
+
+        result += '/';
+        result += path;
+        struct stat s;
+        if (stat(result.c_str(), &s) == 0) {
+          ::strncpy(resolved_path, result.c_str(), resolved_path_size);
+          return result.size() + 1 < resolved_path_size;
+        }
+      }
+    }
+  }
+  return false;
+}
+
+// TODO check if we have a general purpose fork and exec.  We may be
+// able to get rid of this entirely.
+static Status ForkChildForPTraceDebugging(const char *path, char const *argv[],
+                                          char const *envp[], ::pid_t *pid,
+                                          int *pty_fd) {
+  Status error;
+  if (!path || !argv || !envp || !pid || !pty_fd) {
+    error.SetErrorString("invalid arguments");
+    return error;
+  }
+
+  // Use a fork that ties the child process's stdin/out/err to a pseudo
+  // terminal so we can read it in our MachProcess::STDIOThread as unbuffered
+  // io.
+  PseudoTerminal pty;
+  char fork_error[256];
+  memset(fork_error, 0, sizeof(fork_error));
+  *pid = static_cast<::pid_t>(pty.Fork(fork_error, sizeof(fork_error)));
+  if (*pid < 0) {
+    // Status during fork.
+    *pid = static_cast<::pid_t>(LLDB_INVALID_PROCESS_ID);
+    error.SetErrorStringWithFormat("%s(): fork failed: %s", __FUNCTION__,
+                                   fork_error);
+    return error;
+  } else if (pid == 0) {
+    // Child process
+
+    // Debug this process.
+    ::ptrace(PT_TRACE_ME, 0, 0, 0);
+
+    // Get BSD signals as mach exceptions.
+    ::ptrace(PT_SIGEXC, 0, 0, 0);
+
+    // If our parent is setgid, lets make sure we don't inherit those extra
+    // powers due to nepotism.
+    if (::setgid(getgid()) == 0) {
+      // Let the child have its own process group. We need to execute this call
+      // in both the child and parent to avoid a race condition between the two
+      // processes.
+
+      // Set the child process group to match its pid.
+      ::setpgid(0, 0);
+
+      // Sleep a bit to before the exec call.
+      ::sleep(1);
+
+      // Turn this process into the given executable.
+      ::execv(path, (char *const *)argv);
+    }
+    // Exit with error code. Child process should have taken over in above exec
+    // call and if the exec fails it will exit the child process below.
+    ::exit(127);
+  } else {
+    // Parent process
+    // Let the child have its own process group. We need to execute this call
+    // in both the child and parent to avoid a race condition between the two
+    // processes.
+
+    // Set the child process group to match its pid
+    ::setpgid(*pid, *pid);
+    if (pty_fd) {
+      // Release our master pty file descriptor so the pty class doesn't close
+      // it and so we can continue to use it in our STDIO thread
+      *pty_fd = pty.ReleaseMasterFileDescriptor();
+    }
+  }
+  return error;
+}
+
+static Status
+CreatePosixSpawnFileAction(const FileAction &action,
+                           posix_spawn_file_actions_t *file_actions) {
+  Status error;
+
+  // Log it.
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+  if (log) {
+    StreamString stream;
+    stream.PutCString("converting file action for posix_spawn(): ");
+    action.Dump(stream);
+    stream.Flush();
+    log->PutCString(stream.GetString().c_str());
+  }
+
+  // Validate args.
+  if (!file_actions) {
+    error.SetErrorString("mandatory file_actions arg is null");
+    return error;
+  }
+
+  // Build the posix file action.
+  switch (action.GetAction()) {
+  case FileAction::eFileActionOpen: {
+    const int error_code = ::posix_spawn_file_actions_addopen(
+        file_actions, action.GetFD(), action.GetPath(),
+        action.GetActionArgument(), 0);
+    if (error_code != 0) {
+      error.SetError(error_code, eErrorTypePOSIX);
+      return error;
+    }
+    break;
+  }
+
+  case FileAction::eFileActionClose: {
+    const int error_code =
+        ::posix_spawn_file_actions_addclose(file_actions, action.GetFD());
+    if (error_code != 0) {
+      error.SetError(error_code, eErrorTypePOSIX);
+      return error;
+    }
+    break;
+  }
+
+  case FileAction::eFileActionDuplicate: {
+    const int error_code = ::posix_spawn_file_actions_adddup2(
+        file_actions, action.GetFD(), action.GetActionArgument());
+    if (error_code != 0) {
+      error.SetError(error_code, eErrorTypePOSIX);
+      return error;
+    }
+    break;
+  }
+
+  case FileAction::eFileActionNone:
+  default:
+    LLDB_LOGF(log, "%s(): unsupported file action %u", __FUNCTION__,
+              action.GetAction());
+    break;
+  }
+
+  return error;
+}
+
+static Status PosixSpawnChildForPTraceDebugging(const char *path,
+                                                ProcessLaunchInfo &launch_info,
+                                                ::pid_t *pid,
+                                                cpu_type_t *actual_cpu_type) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  if (!pid) {
+    error.SetErrorStringWithFormat("%s(): pid arg cannot be null",
+                                   __FUNCTION__);
+    return error;
+  }
+
+  posix_spawnattr_t attr;
+  short flags;
+  if (log) {
+    StreamString stream;
+    stream.Printf("%s(path='%s',...)\n", __FUNCTION__, path);
+    launch_info.Dump(stream, nullptr);
+    stream.Flush();
+    log->PutCString(stream.GetString().c_str());
+  }
+
+  int error_code;
+  if ((error_code = ::posix_spawnattr_init(&attr)) != 0) {
+    LLDB_LOGF(log, "::posix_spawnattr_init(&attr) failed");
+    error.SetError(error_code, eErrorTypePOSIX);
+    return error;
+  }
+
+  // Ensure we clean up the spawnattr structure however we exit this function.
+  std::unique_ptr<posix_spawnattr_t, int (*)(posix_spawnattr_t *)> spawnattr_up(
+      &attr, ::posix_spawnattr_destroy);
+
+  flags = POSIX_SPAWN_START_SUSPENDED | POSIX_SPAWN_SETSIGDEF |
+          POSIX_SPAWN_SETSIGMASK;
+  if (launch_info.GetFlags().Test(eLaunchFlagDisableASLR))
+    flags |= _POSIX_SPAWN_DISABLE_ASLR;
+
+  sigset_t no_signals;
+  sigset_t all_signals;
+  sigemptyset(&no_signals);
+  sigfillset(&all_signals);
+  ::posix_spawnattr_setsigmask(&attr, &no_signals);
+  ::posix_spawnattr_setsigdefault(&attr, &all_signals);
+
+  if ((error_code = ::posix_spawnattr_setflags(&attr, flags)) != 0) {
+    LLDB_LOG(log,
+             "::posix_spawnattr_setflags(&attr, "
+             "POSIX_SPAWN_START_SUSPENDED{0}) failed: {1}",
+             flags & _POSIX_SPAWN_DISABLE_ASLR ? " | _POSIX_SPAWN_DISABLE_ASLR"
+                                               : "",
+             llvm::sys::StrError(error_code));
+    error.SetError(error_code, eErrorTypePOSIX);
+    return error;
+  }
+
+#if !defined(__arm__)
+
+  // We don't need to do this for ARM, and we really shouldn't now that we have
+  // multiple CPU subtypes and no posix_spawnattr call that allows us to set
+  // which CPU subtype to launch...
+  cpu_type_t desired_cpu_type = launch_info.GetArchitecture().GetMachOCPUType();
+  if (desired_cpu_type != LLDB_INVALID_CPUTYPE) {
+    size_t ocount = 0;
+    error_code =
+        ::posix_spawnattr_setbinpref_np(&attr, 1, &desired_cpu_type, &ocount);
+    if (error_code != 0) {
+      LLDB_LOG(log,
+               "::posix_spawnattr_setbinpref_np(&attr, 1, "
+               "cpu_type = {0:x8}, count => {1}): {2}",
+               desired_cpu_type, ocount, llvm::sys::StrError(error_code));
+      error.SetError(error_code, eErrorTypePOSIX);
+      return error;
+    }
+    if (ocount != 1) {
+      error.SetErrorStringWithFormat("posix_spawnattr_setbinpref_np "
+                                     "did not set the expected number "
+                                     "of cpu_type entries: expected 1 "
+                                     "but was %zu",
+                                     ocount);
+      return error;
+    }
+  }
+#endif
+
+  posix_spawn_file_actions_t file_actions;
+  if ((error_code = ::posix_spawn_file_actions_init(&file_actions)) != 0) {
+    LLDB_LOG(log, "::posix_spawn_file_actions_init(&file_actions) failed: {0}",
+             llvm::sys::StrError(error_code));
+    error.SetError(error_code, eErrorTypePOSIX);
+    return error;
+  }
+
+  // Ensure we clean up file actions however we exit this.  When the
+  // file_actions_up below goes out of scope, we'll get our file action
+  // cleanup.
+  std::unique_ptr<posix_spawn_file_actions_t,
+                  int (*)(posix_spawn_file_actions_t *)>
+      file_actions_up(&file_actions, ::posix_spawn_file_actions_destroy);
+
+  // We assume the caller has setup the file actions appropriately.  We are not
+  // in the business of figuring out what we really need here. lldb-server will
+  // have already called FinalizeFileActions() as well to button these up
+  // properly.
+  const size_t num_actions = launch_info.GetNumFileActions();
+  for (size_t action_index = 0; action_index < num_actions; ++action_index) {
+    const FileAction *const action =
+        launch_info.GetFileActionAtIndex(action_index);
+    if (!action)
+      continue;
+
+    error = CreatePosixSpawnFileAction(*action, &file_actions);
+    if (!error.Success()) {
+      LLDB_LOGF(log,
+                "%s(): error converting FileAction to posix_spawn "
+                "file action: %s",
+                __FUNCTION__, error.AsCString());
+      return error;
+    }
+  }
+
+  // TODO: Verify if we can set the working directory back immediately
+  // after the posix_spawnp call without creating a race condition???
+  const char *const working_directory =
+      launch_info.GetWorkingDirectory().GetCString();
+  if (working_directory && working_directory[0])
+    ::chdir(working_directory);
+
+  auto argv = launch_info.GetArguments().GetArgumentVector();
+  auto envp = launch_info.GetEnvironmentEntries().GetArgumentVector();
+  error_code = ::posix_spawnp(pid, path, &file_actions, &attr,
+                              (char *const *)argv, (char *const *)envp);
+  if (error_code != 0) {
+    LLDB_LOG(log,
+             "::posix_spawnp(pid => {0}, path = '{1}', file_actions "
+             "= {2}, attr = {3}, argv = {4}, envp = {5}) failed: {6}",
+             pid, path, &file_actions, &attr, argv, envp,
+             llvm::sys::StrError(error_code));
+    error.SetError(error_code, eErrorTypePOSIX);
+    return error;
+  }
+
+  // Validate we got a pid.
+  if (pid == LLDB_INVALID_PROCESS_ID) {
+    error.SetErrorString("posix_spawn() did not indicate a failure but it "
+                         "failed to return a pid, aborting.");
+    return error;
+  }
+
+  if (actual_cpu_type) {
+    *actual_cpu_type = GetCPUTypeForLocalProcess(*pid);
+    LLDB_LOGF(log,
+              "%s(): cpu type for launched process pid=%i: "
+              "cpu_type=0x%8.8x",
+              __FUNCTION__, *pid, *actual_cpu_type);
+  }
+
+  return error;
+}
+
+Status LaunchInferior(ProcessLaunchInfo &launch_info, int *pty_master_fd,
+                      LaunchFlavor *launch_flavor) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  if (!launch_flavor) {
+    error.SetErrorString("mandatory launch_flavor field was null");
+    return error;
+  }
+
+  if (log) {
+    StreamString stream;
+    stream.Printf("NativeProcessDarwin::%s(): launching with the "
+                  "following launch info:",
+                  __FUNCTION__);
+    launch_info.Dump(stream, nullptr);
+    stream.Flush();
+    log->PutCString(stream.GetString().c_str());
+  }
+
+  // Retrieve the binary name given to us.
+  char given_path[PATH_MAX];
+  given_path[0] = '\0';
+  launch_info.GetExecutableFile().GetPath(given_path, sizeof(given_path));
+
+  // Determine the manner in which we'll launch.
+  *launch_flavor = g_launch_flavor;
+  if (*launch_flavor == LaunchFlavor::Default) {
+    // Our default launch method is posix spawn
+    *launch_flavor = LaunchFlavor::PosixSpawn;
+#if defined WITH_FBS
+    // Check if we have an app bundle, if so launch using BackBoard Services.
+    if (strstr(given_path, ".app")) {
+      *launch_flavor = eLaunchFlavorFBS;
+    }
+#elif defined WITH_BKS
+    // Check if we have an app bundle, if so launch using BackBoard Services.
+    if (strstr(given_path, ".app")) {
+      *launch_flavor = eLaunchFlavorBKS;
+    }
+#elif defined WITH_SPRINGBOARD
+    // Check if we have an app bundle, if so launch using SpringBoard.
+    if (strstr(given_path, ".app")) {
+      *launch_flavor = eLaunchFlavorSpringBoard;
+    }
+#endif
+  }
+
+  // Attempt to resolve the binary name to an absolute path.
+  char resolved_path[PATH_MAX];
+  resolved_path[0] = '\0';
+
+  LLDB_LOGF(log, "%s(): attempting to resolve given binary path: \"%s\"",
+            __FUNCTION__, given_path);
+
+  // If we fail to resolve the path to our executable, then just use what we
+  // were given and hope for the best
+  if (!ResolveExecutablePath(given_path, resolved_path,
+                             sizeof(resolved_path))) {
+    LLDB_LOGF(log,
+              "%s(): failed to resolve binary path, using "
+              "what was given verbatim and hoping for the best",
+              __FUNCTION__);
+    ::strncpy(resolved_path, given_path, sizeof(resolved_path));
+  } else {
+    LLDB_LOGF(log, "%s(): resolved given binary path to: \"%s\"", __FUNCTION__,
+              resolved_path);
+  }
+
+  char launch_err_str[PATH_MAX];
+  launch_err_str[0] = '\0';
+
+  // TODO figure out how to handle QSetProcessEvent
+  // const char *process_event = ctx.GetProcessEvent();
+
+  // Ensure the binary is there.
+  struct stat path_stat;
+  if (::stat(resolved_path, &path_stat) == -1) {
+    error.SetErrorToErrno();
+    return error;
+  }
+
+  // Fork a child process for debugging
+  // state_callback(eStateLaunching);
+
+  const auto argv = launch_info.GetArguments().GetConstArgumentVector();
+  const auto envp =
+      launch_info.GetEnvironmentEntries().GetConstArgumentVector();
+
+  switch (*launch_flavor) {
+  case LaunchFlavor::ForkExec: {
+    ::pid_t pid = LLDB_INVALID_PROCESS_ID;
+    error = ForkChildForPTraceDebugging(resolved_path, argv, envp, &pid,
+                                        pty_master_fd);
+    if (error.Success()) {
+      launch_info.SetProcessID(static_cast<lldb::pid_t>(pid));
+    } else {
+      // Reset any variables that might have been set during a failed launch
+      // attempt.
+      if (pty_master_fd)
+        *pty_master_fd = -1;
+
+      // We're done.
+      return error;
+    }
+  } break;
+
+#ifdef WITH_FBS
+  case LaunchFlavor::FBS: {
+    const char *app_ext = strstr(path, ".app");
+    if (app_ext && (app_ext[4] == '\0' || app_ext[4] == '/')) {
+      std::string app_bundle_path(path, app_ext + strlen(".app"));
+      m_flags |= eMachProcessFlagsUsingFBS;
+      if (BoardServiceLaunchForDebug(app_bundle_path.c_str(), argv, envp,
+                                     no_stdio, disable_aslr, event_data,
+                                     launch_err) != 0)
+        return m_pid; // A successful SBLaunchForDebug() returns and assigns a
+                      // non-zero m_pid.
+      else
+        break; // We tried a FBS launch, but didn't succeed lets get out
+    }
+  } break;
+#endif
+
+#ifdef WITH_BKS
+  case LaunchFlavor::BKS: {
+    const char *app_ext = strstr(path, ".app");
+    if (app_ext && (app_ext[4] == '\0' || app_ext[4] == '/')) {
+      std::string app_bundle_path(path, app_ext + strlen(".app"));
+      m_flags |= eMachProcessFlagsUsingBKS;
+      if (BoardServiceLaunchForDebug(app_bundle_path.c_str(), argv, envp,
+                                     no_stdio, disable_aslr, event_data,
+                                     launch_err) != 0)
+        return m_pid; // A successful SBLaunchForDebug() returns and assigns a
+                      // non-zero m_pid.
+      else
+        break; // We tried a BKS launch, but didn't succeed lets get out
+    }
+  } break;
+#endif
+
+#ifdef WITH_SPRINGBOARD
+  case LaunchFlavor::SpringBoard: {
+    //  .../whatever.app/whatever ?
+    //  Or .../com.apple.whatever.app/whatever -- be careful of ".app" in
+    //  "com.apple.whatever" here
+    const char *app_ext = strstr(path, ".app/");
+    if (app_ext == NULL) {
+      // .../whatever.app ?
+      int len = strlen(path);
+      if (len > 5) {
+        if (strcmp(path + len - 4, ".app") == 0) {
+          app_ext = path + len - 4;
+        }
+      }
+    }
+    if (app_ext) {
+      std::string app_bundle_path(path, app_ext + strlen(".app"));
+      if (SBLaunchForDebug(app_bundle_path.c_str(), argv, envp, no_stdio,
+                           disable_aslr, launch_err) != 0)
+        return m_pid; // A successful SBLaunchForDebug() returns and assigns a
+                      // non-zero m_pid.
+      else
+        break; // We tried a springboard launch, but didn't succeed lets get out
+    }
+  } break;
+#endif
+
+  case LaunchFlavor::PosixSpawn: {
+    ::pid_t pid = LLDB_INVALID_PROCESS_ID;
+
+    // Retrieve paths for stdin/stdout/stderr.
+    cpu_type_t actual_cpu_type = 0;
+    error = PosixSpawnChildForPTraceDebugging(resolved_path, launch_info, &pid,
+                                              &actual_cpu_type);
+    if (error.Success()) {
+      launch_info.SetProcessID(static_cast<lldb::pid_t>(pid));
+      if (pty_master_fd)
+        *pty_master_fd = launch_info.GetPTY().ReleaseMasterFileDescriptor();
+    } else {
+      // Reset any variables that might have been set during a failed launch
+      // attempt.
+      if (pty_master_fd)
+        *pty_master_fd = -1;
+
+      // We're done.
+      return error;
+    }
+    break;
+  }
+
+  default:
+    // Invalid launch flavor.
+    error.SetErrorStringWithFormat("NativeProcessDarwin::%s(): unknown "
+                                   "launch flavor %d",
+                                   __FUNCTION__, (int)*launch_flavor);
+    return error;
+  }
+
+  if (launch_info.GetProcessID() == LLDB_INVALID_PROCESS_ID) {
+    // If we don't have a valid process ID and no one has set the error, then
+    // return a generic error.
+    if (error.Success())
+      error.SetErrorStringWithFormat("%s(): failed to launch, no reason "
+                                     "specified",
+                                     __FUNCTION__);
+  }
+
+  // We're done with the launch side of the operation.
+  return error;
+}
+}
+} // namespaces
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.h
new file mode 100644
index 00000000000..0e65b56a143
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.h
@@ -0,0 +1,48 @@
+//===-- DarwinProcessLauncher.h ---------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef DarwinProcessLauncher_h
+#define DarwinProcessLauncher_h
+
+// C headers
+#include <mach/machine.h>
+#include <sys/types.h>
+
+// C++ headers
+#include <functional>
+
+// LLDB headers
+#include "lldb/lldb-enumerations.h"
+#include "lldb/lldb-forward.h"
+
+#include "LaunchFlavor.h"
+
+namespace lldb_private {
+namespace darwin_process_launcher {
+// =============================================================================
+/// Launches a process for debugging.
+///
+/// \param[inout] launch_info
+///     Specifies details about the process to launch (e.g. path, architecture,
+///     etc.).  On output, includes the launched ProcessID (pid).
+///
+/// \param[out] pty_master_fd
+///     Returns the master side of the pseudo-terminal used to communicate
+///     with stdin/stdout from the launched process.  May be nullptr.
+///
+/// \param[out] launch_flavor
+///     Contains the launch flavor used when launching the process.
+// =============================================================================
+Status
+LaunchInferior(ProcessLaunchInfo &launch_info, int *pty_master_fd,
+               lldb_private::process_darwin::LaunchFlavor *launch_flavor);
+
+} // darwin_process_launcher
+} // lldb_private
+
+#endif /* DarwinProcessLauncher_h */
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/LaunchFlavor.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/LaunchFlavor.h
new file mode 100644
index 00000000000..cfd76d1b9c3
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/LaunchFlavor.h
@@ -0,0 +1,32 @@
+//===-- LaunchFlavor.h ---------------------------------------- -*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LaunchFlavor_h
+#define LaunchFlavor_h
+
+namespace lldb_private {
+namespace process_darwin {
+
+enum class LaunchFlavor {
+  Default = 0,
+  PosixSpawn = 1,
+  ForkExec = 2,
+#ifdef WITH_SPRINGBOARD
+  SpringBoard = 3,
+#endif
+#ifdef WITH_BKS
+  BKS = 4,
+#endif
+#ifdef WITH_FBS
+  FBS = 5
+#endif
+};
+}
+} // namespaces
+
+#endif /* LaunchFlavor_h */
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.cpp
new file mode 100644
index 00000000000..073ad64b300
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.cpp
@@ -0,0 +1,514 @@
+//===-- MachException.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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 6/18/07.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MachException.h"
+
+// C includes
+#include <errno.h>
+#include <sys/ptrace.h>
+#include <sys/types.h>
+
+// C++ includes
+#include <mutex>
+
+// LLDB includes
+#include "lldb/Target/UnixSignals.h"
+#include "lldb/Utility/LLDBAssert.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/Utility/Stream.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+
+// Routine mach_exception_raise
+extern "C" kern_return_t
+catch_mach_exception_raise(mach_port_t exception_port, mach_port_t thread,
+                           mach_port_t task, exception_type_t exception,
+                           mach_exception_data_t code,
+                           mach_msg_type_number_t codeCnt);
+
+extern "C" kern_return_t catch_mach_exception_raise_state(
+    mach_port_t exception_port, exception_type_t exception,
+    const mach_exception_data_t code, mach_msg_type_number_t codeCnt,
+    int *flavor, const thread_state_t old_state,
+    mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
+    mach_msg_type_number_t *new_stateCnt);
+
+// Routine mach_exception_raise_state_identity
+extern "C" kern_return_t catch_mach_exception_raise_state_identity(
+    mach_port_t exception_port, mach_port_t thread, mach_port_t task,
+    exception_type_t exception, mach_exception_data_t code,
+    mach_msg_type_number_t codeCnt, int *flavor, thread_state_t old_state,
+    mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
+    mach_msg_type_number_t *new_stateCnt);
+
+extern "C" boolean_t mach_exc_server(mach_msg_header_t *InHeadP,
+                                     mach_msg_header_t *OutHeadP);
+
+static MachException::Data *g_message = NULL;
+
+extern "C" kern_return_t catch_mach_exception_raise_state(
+    mach_port_t exc_port, exception_type_t exc_type,
+    const mach_exception_data_t exc_data, mach_msg_type_number_t exc_data_count,
+    int *flavor, const thread_state_t old_state,
+    mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
+    mach_msg_type_number_t *new_stateCnt) {
+  // TODO change to LIBLLDB_LOG_EXCEPTION
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+  if (log) {
+    LLDB_LOGF(log,
+              "::%s(exc_port = 0x%4.4x, exc_type = %d (%s), "
+              "exc_data = 0x%llx, exc_data_count = %d)",
+              __FUNCTION__, exc_port, exc_type, MachException::Name(exc_type),
+              (uint64_t)exc_data, exc_data_count);
+  }
+  return KERN_FAILURE;
+}
+
+extern "C" kern_return_t catch_mach_exception_raise_state_identity(
+    mach_port_t exc_port, mach_port_t thread_port, mach_port_t task_port,
+    exception_type_t exc_type, mach_exception_data_t exc_data,
+    mach_msg_type_number_t exc_data_count, int *flavor,
+    thread_state_t old_state, mach_msg_type_number_t old_stateCnt,
+    thread_state_t new_state, mach_msg_type_number_t *new_stateCnt) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+  if (log) {
+    LLDB_LOGF(log,
+              "::%s(exc_port = 0x%4.4x, thd_port = 0x%4.4x, "
+              "tsk_port = 0x%4.4x, exc_type = %d (%s), exc_data[%d] = "
+              "{ 0x%llx, 0x%llx })",
+              __FUNCTION__, exc_port, thread_port, task_port, exc_type,
+              MachException::Name(exc_type), exc_data_count,
+              (uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
+              (uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
+  }
+
+  return KERN_FAILURE;
+}
+
+extern "C" kern_return_t
+catch_mach_exception_raise(mach_port_t exc_port, mach_port_t thread_port,
+                           mach_port_t task_port, exception_type_t exc_type,
+                           mach_exception_data_t exc_data,
+                           mach_msg_type_number_t exc_data_count) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+  if (log) {
+    LLDB_LOGF(log,
+              "::%s(exc_port = 0x%4.4x, thd_port = 0x%4.4x, "
+              "tsk_port = 0x%4.4x, exc_type = %d (%s), exc_data[%d] "
+              "= { 0x%llx, 0x%llx })",
+              __FUNCTION__, exc_port, thread_port, task_port, exc_type,
+              MachException::Name(exc_type), exc_data_count,
+              (uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
+              (uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
+  }
+
+  if (task_port == g_message->task_port) {
+    g_message->task_port = task_port;
+    g_message->thread_port = thread_port;
+    g_message->exc_type = exc_type;
+    g_message->exc_data.resize(exc_data_count);
+    ::memcpy(&g_message->exc_data[0], exc_data,
+             g_message->exc_data.size() * sizeof(mach_exception_data_type_t));
+    return KERN_SUCCESS;
+  }
+  return KERN_FAILURE;
+}
+
+bool MachException::Data::GetStopInfo(struct ThreadStopInfo *stop_info,
+                                      const UnixSignals &signals,
+                                      Stream &stream) const {
+  if (!stop_info)
+    return false;
+
+  // Zero out the structure.
+  memset(stop_info, 0, sizeof(struct ThreadStopInfo));
+
+  if (exc_type == 0) {
+    stop_info->reason = eStopReasonInvalid;
+    return true;
+  }
+
+  // We always stop with a mach exception.
+  stop_info->reason = eStopReasonException;
+  // Save the EXC_XXXX exception type.
+  stop_info->details.exception.type = exc_type;
+
+  // Fill in a text description
+  const char *exc_name = MachException::Name(exc_type);
+  if (exc_name)
+    stream.Printf("%s", exc_name);
+  else
+    stream.Printf("%i", exc_type);
+
+  stop_info->details.exception.data_count = exc_data.size();
+
+  int soft_signal = SoftSignal();
+  if (soft_signal) {
+    const char *sig_str = signals.GetSignalAsCString(soft_signal);
+    stream.Printf(" EXC_SOFT_SIGNAL( %i ( %s ))", soft_signal,
+                  sig_str ? sig_str : "unknown signal");
+  } else {
+    // No special disassembly for exception data, just print it.
+    size_t idx;
+    stream.Printf(" data[%llu] = {",
+                  (uint64_t)stop_info->details.exception.data_count);
+
+    for (idx = 0; idx < stop_info->details.exception.data_count; ++idx) {
+      stream.Printf(
+          "0x%llx%c", (uint64_t)exc_data[idx],
+          ((idx + 1 == stop_info->details.exception.data_count) ? '}' : ','));
+    }
+  }
+
+  // Copy the exception data
+  for (size_t i = 0; i < stop_info->details.exception.data_count; i++)
+    stop_info->details.exception.data[i] = exc_data[i];
+
+  return true;
+}
+
+Status MachException::Message::Receive(mach_port_t port,
+                                       mach_msg_option_t options,
+                                       mach_msg_timeout_t timeout,
+                                       mach_port_t notify_port) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  mach_msg_timeout_t mach_msg_timeout =
+      options & MACH_RCV_TIMEOUT ? timeout : 0;
+  if (log && ((options & MACH_RCV_TIMEOUT) == 0)) {
+    // Dump this log message if we have no timeout in case it never returns
+    LLDB_LOGF(log,
+              "::mach_msg(msg->{bits = %#x, size = %u remote_port = %#x, "
+              "local_port = %#x, reserved = 0x%x, id = 0x%x}, "
+              "option = %#x, send_size = 0, rcv_size = %llu, "
+              "rcv_name = %#x, timeout = %u, notify = %#x)",
+              exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
+              exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
+              exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options,
+              (uint64_t)sizeof(exc_msg.data), port, mach_msg_timeout,
+              notify_port);
+  }
+
+  mach_msg_return_t mach_err =
+      ::mach_msg(&exc_msg.hdr,
+                 options,              // options
+                 0,                    // Send size
+                 sizeof(exc_msg.data), // Receive size
+                 port,                 // exception port to watch for
+                                       // exception on
+                 mach_msg_timeout,     // timeout in msec (obeyed only
+                                       // if MACH_RCV_TIMEOUT is ORed
+                                       // into the options parameter)
+                 notify_port);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+
+  // Dump any errors we get
+  if (error.Fail() && log) {
+    LLDB_LOGF(log,
+              "::mach_msg(msg->{bits = %#x, size = %u remote_port = %#x, "
+              "local_port = %#x, reserved = 0x%x, id = 0x%x}, "
+              "option = %#x, send_size = %u, rcv_size = %lu, rcv_name "
+              "= %#x, timeout = %u, notify = %#x) failed: %s",
+              exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
+              exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
+              exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options, 0,
+              sizeof(exc_msg.data), port, mach_msg_timeout, notify_port,
+              error.AsCString());
+  }
+  return error;
+}
+
+void MachException::Message::Dump(Stream &stream) const {
+  stream.Printf("  exc_msg { bits = 0x%8.8x size = 0x%8.8x remote-port = "
+                "0x%8.8x local-port = 0x%8.8x reserved = 0x%8.8x id = "
+                "0x%8.8x }\n",
+                exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
+                exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
+                exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id);
+
+  stream.Printf("  reply_msg { bits = 0x%8.8x size = 0x%8.8x remote-port = "
+                "0x%8.8x local-port = 0x%8.8x reserved = 0x%8.8x id = "
+                "0x%8.8x }",
+                reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
+                reply_msg.hdr.msgh_remote_port, reply_msg.hdr.msgh_local_port,
+                reply_msg.hdr.msgh_reserved, reply_msg.hdr.msgh_id);
+}
+
+bool MachException::Message::CatchExceptionRaise(task_t task) {
+  bool success = false;
+  state.task_port = task;
+  g_message = &state;
+  // The exc_server function is the MIG generated server handling function to
+  // handle messages from the kernel relating to the occurrence of an exception
+  // in a thread. Such messages are delivered to the exception port set via
+  // thread_set_exception_ports or task_set_exception_ports. When an exception
+  // occurs in a thread, the thread sends an exception message to its exception
+  // port, blocking in the kernel waiting for the receipt of a reply. The
+  // exc_server function performs all necessary argument handling for this
+  // kernel message and calls catch_exception_raise,
+  // catch_exception_raise_state or catch_exception_raise_state_identity, which
+  // should handle the exception. If the called routine returns KERN_SUCCESS, a
+  // reply message will be sent, allowing the thread to continue from the point
+  // of the exception; otherwise, no reply message is sent and the called
+  // routine must have dealt with the exception thread directly.
+  if (mach_exc_server(&exc_msg.hdr, &reply_msg.hdr)) {
+    success = true;
+  } else {
+    Log *log(
+        GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+    LLDB_LOGF(log,
+              "MachException::Message::%s(): mach_exc_server "
+              "returned zero...",
+              __FUNCTION__);
+  }
+  g_message = NULL;
+  return success;
+}
+
+Status MachException::Message::Reply(::pid_t inferior_pid, task_t inferior_task,
+                                     int signal) {
+  // Reply to the exception...
+  Status error;
+
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  // If we had a soft signal, we need to update the thread first so it can
+  // continue without signaling
+  int soft_signal = state.SoftSignal();
+  if (soft_signal) {
+    int state_pid = -1;
+    if (inferior_task == state.task_port) {
+      // This is our task, so we can update the signal to send to it
+      state_pid = inferior_pid;
+      soft_signal = signal;
+    } else {
+      auto mach_err = ::pid_for_task(state.task_port, &state_pid);
+      if (mach_err) {
+        error.SetError(mach_err, eErrorTypeMachKernel);
+        LLDB_LOGF(log,
+                  "MachException::Message::%s(): pid_for_task() "
+                  "failed: %s",
+                  __FUNCTION__, error.AsCString());
+        return error;
+      }
+    }
+
+    lldbassert(state_pid != -1);
+    if (state_pid != -1) {
+      errno = 0;
+      caddr_t thread_port_caddr = (caddr_t)(uintptr_t)state.thread_port;
+      if (::ptrace(PT_THUPDATE, state_pid, thread_port_caddr, soft_signal) != 0)
+        error.SetError(errno, eErrorTypePOSIX);
+
+      if (!error.Success()) {
+        LLDB_LOGF(log,
+                  "::ptrace(request = PT_THUPDATE, pid = "
+                  "0x%4.4x, tid = 0x%4.4x, signal = %i)",
+                  state_pid, state.thread_port, soft_signal);
+        return error;
+      }
+    }
+  }
+
+  LLDB_LOGF(log,
+            "::mach_msg ( msg->{bits = %#x, size = %u, remote_port "
+            "= %#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, "
+            "option = %#x, send_size = %u, rcv_size = %u, rcv_name "
+            "= %#x, timeout = %u, notify = %#x)",
+            reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
+            reply_msg.hdr.msgh_remote_port, reply_msg.hdr.msgh_local_port,
+            reply_msg.hdr.msgh_reserved, reply_msg.hdr.msgh_id,
+            MACH_SEND_MSG | MACH_SEND_INTERRUPT, reply_msg.hdr.msgh_size, 0,
+            MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
+
+  auto mach_err =
+      ::mach_msg(&reply_msg.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
+                 reply_msg.hdr.msgh_size, 0, MACH_PORT_NULL,
+                 MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
+  if (mach_err)
+    error.SetError(mach_err, eErrorTypeMachKernel);
+
+  // Log our error if we have one.
+  if (error.Fail() && log) {
+    if (error.GetError() == MACH_SEND_INTERRUPTED) {
+      log->PutCString("::mach_msg() - send interrupted");
+      // TODO: keep retrying to reply???
+    } else if (state.task_port == inferior_task) {
+      LLDB_LOGF(log,
+                "mach_msg(): returned an error when replying "
+                "to a mach exception: error = %u (%s)",
+                error.GetError(), error.AsCString());
+    } else {
+      LLDB_LOGF(log, "::mach_msg() - failed (child of task): %u (%s)",
+                error.GetError(), error.AsCString());
+    }
+  }
+
+  return error;
+}
+
+#define PREV_EXC_MASK_ALL                                                      \
+  (EXC_MASK_BAD_ACCESS | EXC_MASK_BAD_INSTRUCTION | EXC_MASK_ARITHMETIC |      \
+   EXC_MASK_EMULATION | EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT |              \
+   EXC_MASK_SYSCALL | EXC_MASK_MACH_SYSCALL | EXC_MASK_RPC_ALERT |             \
+   EXC_MASK_MACHINE)
+
+// Don't listen for EXC_RESOURCE, it should really get handled by the system
+// handler.
+
+#ifndef EXC_RESOURCE
+#define EXC_RESOURCE 11
+#endif
+
+#ifndef EXC_MASK_RESOURCE
+#define EXC_MASK_RESOURCE (1 << EXC_RESOURCE)
+#endif
+
+#define LLDB_EXC_MASK (EXC_MASK_ALL & ~EXC_MASK_RESOURCE)
+
+Status MachException::PortInfo::Save(task_t task) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  LLDB_LOGF(log, "MachException::PortInfo::%s(task = 0x%4.4x)", __FUNCTION__,
+            task);
+
+  // Be careful to be able to have debugserver built on a newer OS than what it
+  // is currently running on by being able to start with all exceptions and
+  // back off to just what is supported on the current system
+  mask = LLDB_EXC_MASK;
+
+  count = (sizeof(ports) / sizeof(ports[0]));
+  auto mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
+                                             behaviors, flavors);
+  if (mach_err)
+    error.SetError(mach_err, eErrorTypeMachKernel);
+
+  if (log) {
+    if (error.Success()) {
+      LLDB_LOGF(log,
+                "::task_get_exception_ports(task = 0x%4.4x, mask = "
+                "0x%x, maskCnt => %u, ports, behaviors, flavors)",
+                task, mask, count);
+    } else {
+      LLDB_LOGF(log,
+                "::task_get_exception_ports(task = 0x%4.4x, mask = 0x%x, "
+                "maskCnt => %u, ports, behaviors, flavors) error: %u (%s)",
+                task, mask, count, error.GetError(), error.AsCString());
+    }
+  }
+
+  if ((error.GetError() == KERN_INVALID_ARGUMENT) &&
+      (mask != PREV_EXC_MASK_ALL)) {
+    mask = PREV_EXC_MASK_ALL;
+    count = (sizeof(ports) / sizeof(ports[0]));
+    mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
+                                          behaviors, flavors);
+    error.SetError(mach_err, eErrorTypeMachKernel);
+    if (log) {
+      if (error.Success()) {
+        LLDB_LOGF(log,
+                  "::task_get_exception_ports(task = 0x%4.4x, "
+                  "mask = 0x%x, maskCnt => %u, ports, behaviors, "
+                  "flavors)",
+                  task, mask, count);
+      } else {
+        LLDB_LOGF(log,
+                  "::task_get_exception_ports(task = 0x%4.4x, mask = "
+                  "0x%x, maskCnt => %u, ports, behaviors, flavors) "
+                  "error: %u (%s)",
+                  task, mask, count, error.GetError(), error.AsCString());
+      }
+    }
+  }
+  if (error.Fail()) {
+    mask = 0;
+    count = 0;
+  }
+  return error;
+}
+
+Status MachException::PortInfo::Restore(task_t task) {
+  Status error;
+
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  LLDB_LOGF(log, "MachException::PortInfo::Restore(task = 0x%4.4x)", task);
+
+  uint32_t i = 0;
+  if (count > 0) {
+    for (i = 0; i < count; i++) {
+      auto mach_err = ::task_set_exception_ports(task, masks[i], ports[i],
+                                                 behaviors[i], flavors[i]);
+      if (mach_err)
+        error.SetError(mach_err, eErrorTypeMachKernel);
+      if (log) {
+        if (error.Success()) {
+          LLDB_LOGF(log,
+                    "::task_set_exception_ports(task = 0x%4.4x, "
+                    "exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
+                    "behavior = 0x%8.8x, new_flavor = 0x%8.8x)",
+                    task, masks[i], ports[i], behaviors[i], flavors[i]);
+        } else {
+          LLDB_LOGF(log,
+                    "::task_set_exception_ports(task = 0x%4.4x, "
+                    "exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
+                    "behavior = 0x%8.8x, new_flavor = 0x%8.8x): "
+                    "error %u (%s)",
+                    task, masks[i], ports[i], behaviors[i], flavors[i],
+                    error.GetError(), error.AsCString());
+        }
+      }
+
+      // Bail if we encounter any errors
+      if (error.Fail())
+        break;
+    }
+  }
+
+  count = 0;
+  return error;
+}
+
+const char *MachException::Name(exception_type_t exc_type) {
+  switch (exc_type) {
+  case EXC_BAD_ACCESS:
+    return "EXC_BAD_ACCESS";
+  case EXC_BAD_INSTRUCTION:
+    return "EXC_BAD_INSTRUCTION";
+  case EXC_ARITHMETIC:
+    return "EXC_ARITHMETIC";
+  case EXC_EMULATION:
+    return "EXC_EMULATION";
+  case EXC_SOFTWARE:
+    return "EXC_SOFTWARE";
+  case EXC_BREAKPOINT:
+    return "EXC_BREAKPOINT";
+  case EXC_SYSCALL:
+    return "EXC_SYSCALL";
+  case EXC_MACH_SYSCALL:
+    return "EXC_MACH_SYSCALL";
+  case EXC_RPC_ALERT:
+    return "EXC_RPC_ALERT";
+#ifdef EXC_CRASH
+  case EXC_CRASH:
+    return "EXC_CRASH";
+#endif
+  default:
+    break;
+  }
+  return NULL;
+}
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.h
new file mode 100644
index 00000000000..18e49173b02
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/MachException.h
@@ -0,0 +1,139 @@
+//===-- MachException.h -----------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 6/18/07.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __MachException_h__
+#define __MachException_h__
+
+#include <mach/mach.h>
+#include <vector>
+
+#include "lldb/Host/Debug.h"
+#include "lldb/lldb-private-forward.h"
+#include "lldb/lldb-types.h"
+
+namespace lldb_private {
+namespace process_darwin {
+
+typedef union MachMessageTag {
+  mach_msg_header_t hdr;
+  char data[1024];
+} MachMessage;
+
+class MachException {
+public:
+  struct PortInfo {
+    exception_mask_t mask; // the exception mask for this device which may be a
+                           // subset of EXC_MASK_ALL...
+    exception_mask_t masks[EXC_TYPES_COUNT];
+    mach_port_t ports[EXC_TYPES_COUNT];
+    exception_behavior_t behaviors[EXC_TYPES_COUNT];
+    thread_state_flavor_t flavors[EXC_TYPES_COUNT];
+    mach_msg_type_number_t count;
+
+    Status Save(task_t task);
+
+    Status Restore(task_t task);
+  };
+
+  struct Data {
+    task_t task_port;
+    thread_t thread_port;
+    exception_type_t exc_type;
+    std::vector<mach_exception_data_type_t> exc_data;
+    Data()
+        : task_port(TASK_NULL), thread_port(THREAD_NULL), exc_type(0),
+          exc_data() {}
+
+    void Clear() {
+      task_port = TASK_NULL;
+      thread_port = THREAD_NULL;
+      exc_type = 0;
+      exc_data.clear();
+    }
+
+    bool IsValid() const {
+      return task_port != TASK_NULL && thread_port != THREAD_NULL &&
+             exc_type != 0;
+    }
+
+    // Return the SoftSignal for this MachException data, or zero if there is
+    // none
+    int SoftSignal() const {
+      if (exc_type == EXC_SOFTWARE && exc_data.size() == 2 &&
+          exc_data[0] == EXC_SOFT_SIGNAL)
+        return static_cast<int>(exc_data[1]);
+      return 0;
+    }
+
+    bool IsBreakpoint() const {
+      return (exc_type == EXC_BREAKPOINT ||
+              ((exc_type == EXC_SOFTWARE) && exc_data[0] == 1));
+    }
+
+    bool GetStopInfo(ThreadStopInfo *stop_info, const UnixSignals &signals,
+                     Stream &stream) const;
+  };
+
+  struct Message {
+    MachMessage exc_msg;
+    MachMessage reply_msg;
+    Data state;
+
+    Message() : state() {
+      memset(&exc_msg, 0, sizeof(exc_msg));
+      memset(&reply_msg, 0, sizeof(reply_msg));
+    }
+
+    bool CatchExceptionRaise(task_t task);
+
+    Status Reply(::pid_t inferior_pid, task_t inferior_task, int signal);
+
+    Status Receive(mach_port_t receive_port, mach_msg_option_t options,
+                   mach_msg_timeout_t timeout,
+                   mach_port_t notify_port = MACH_PORT_NULL);
+
+    void Dump(Stream &stream) const;
+
+    typedef std::vector<Message> collection;
+    typedef collection::iterator iterator;
+    typedef collection::const_iterator const_iterator;
+  };
+
+  enum {
+    e_actionForward, // Forward signal to inferior process
+    e_actionStop,    // Stop when this signal is received
+  };
+  struct Action {
+    task_t task_port;          // Set to TASK_NULL for any TASK
+    thread_t thread_port;      // Set to THREAD_NULL for any thread
+    exception_type_t exc_mask; // Mach exception mask to watch for
+    std::vector<mach_exception_data_type_t> exc_data_mask; // Mask to apply to
+                                                           // exception data, or
+                                                           // empty to ignore
+                                                           // exc_data value for
+                                                           // exception
+    std::vector<mach_exception_data_type_t> exc_data_value; // Value to compare
+                                                            // to exception data
+                                                            // after masking, or
+                                                            // empty to ignore
+                                                            // exc_data value
+                                                            // for exception
+    uint8_t flags; // Action flags describing what to do with the exception
+  };
+
+  static const char *Name(exception_type_t exc_type);
+};
+
+} // namespace process_darwin
+} // namespace lldb_private
+
+#endif
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.cpp
new file mode 100644
index 00000000000..18dbdda9a33
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.cpp
@@ -0,0 +1,1535 @@
+//===-- NativeProcessDarwin.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
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeProcessDarwin.h"
+
+// C includes
+#include <mach/mach_init.h>
+#include <mach/mach_traps.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+
+// C++ includes
+// LLDB includes
+#include "lldb/Host/PseudoTerminal.h"
+#include "lldb/Target/ProcessLaunchInfo.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/State.h"
+#include "lldb/Utility/StreamString.h"
+
+#include "CFBundle.h"
+#include "CFString.h"
+#include "DarwinProcessLauncher.h"
+
+#include "MachException.h"
+
+#include "llvm/Support/FileSystem.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+using namespace lldb_private::darwin_process_launcher;
+
+// Hidden Impl
+
+namespace {
+struct hack_task_dyld_info {
+  mach_vm_address_t all_image_info_addr;
+  mach_vm_size_t all_image_info_size;
+};
+}
+
+// Public Static Methods
+
+Status NativeProcessProtocol::Launch(
+    ProcessLaunchInfo &launch_info,
+    NativeProcessProtocol::NativeDelegate &native_delegate, MainLoop &mainloop,
+    NativeProcessProtocolSP &native_process_sp) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  Status error;
+
+  // Verify the working directory is valid if one was specified.
+  FileSpec working_dir(launch_info.GetWorkingDirectory());
+  if (working_dir) {
+    FileInstance::Instance().Resolve(working_dir);
+    if (!FileSystem::Instance().IsDirectory(working_dir)) {
+      error.SetErrorStringWithFormat("No such file or directory: %s",
+                                   working_dir.GetCString());
+      return error;
+    }
+  }
+
+  // Launch the inferior.
+  int pty_master_fd = -1;
+  LaunchFlavor launch_flavor = LaunchFlavor::Default;
+
+  error = LaunchInferior(launch_info, &pty_master_fd, &launch_flavor);
+
+  // Handle launch failure.
+  if (!error.Success()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() failed to launch process: "
+              "%s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+
+  // Handle failure to return a pid.
+  if (launch_info.GetProcessID() == LLDB_INVALID_PROCESS_ID) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() launch succeeded but no "
+              "pid was returned!  Aborting.",
+              __FUNCTION__);
+    return error;
+  }
+
+  // Create the Darwin native process impl.
+  std::shared_ptr<NativeProcessDarwin> np_darwin_sp(
+      new NativeProcessDarwin(launch_info.GetProcessID(), pty_master_fd));
+  if (!np_darwin_sp->RegisterNativeDelegate(native_delegate)) {
+    native_process_sp.reset();
+    error.SetErrorStringWithFormat("failed to register the native delegate");
+    return error;
+  }
+
+  // Finalize the processing needed to debug the launched process with a
+  // NativeProcessDarwin instance.
+  error = np_darwin_sp->FinalizeLaunch(launch_flavor, mainloop);
+  if (!error.Success()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() aborting, failed to finalize"
+              " the launching of the process: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+
+  // Return the process and process id to the caller through the launch args.
+  native_process_sp = np_darwin_sp;
+  return error;
+}
+
+Status NativeProcessProtocol::Attach(
+    lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
+    MainLoop &mainloop, NativeProcessProtocolSP &native_process_sp) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+  LLDB_LOGF(log, "NativeProcessDarwin::%s(pid = %" PRIi64 ")", __FUNCTION__,
+            pid);
+
+  // Retrieve the architecture for the running process.
+  ArchSpec process_arch;
+  Status error = ResolveProcessArchitecture(pid, process_arch);
+  if (!error.Success())
+    return error;
+
+  // TODO get attach to return this value.
+  const int pty_master_fd = -1;
+  std::shared_ptr<NativeProcessDarwin> native_process_darwin_sp(
+      new NativeProcessDarwin(pid, pty_master_fd));
+
+  if (!native_process_darwin_sp->RegisterNativeDelegate(native_delegate)) {
+    error.SetErrorStringWithFormat("failed to register the native "
+                                   "delegate");
+    return error;
+  }
+
+  native_process_darwin_sp->AttachToInferior(mainloop, pid, error);
+  if (!error.Success())
+    return error;
+
+  native_process_sp = native_process_darwin_sp;
+  return error;
+}
+
+// ctor/dtor
+
+NativeProcessDarwin::NativeProcessDarwin(lldb::pid_t pid, int pty_master_fd)
+    : NativeProcessProtocol(pid), m_task(TASK_NULL), m_did_exec(false),
+      m_cpu_type(0), m_exception_port(MACH_PORT_NULL), m_exc_port_info(),
+      m_exception_thread(nullptr), m_exception_messages_mutex(),
+      m_sent_interrupt_signo(0), m_auto_resume_signo(0), m_thread_list(),
+      m_thread_actions(), m_waitpid_pipe(), m_waitpid_thread(nullptr),
+      m_waitpid_reader_handle() {
+  // TODO add this to the NativeProcessProtocol constructor.
+  m_terminal_fd = pty_master_fd;
+}
+
+NativeProcessDarwin::~NativeProcessDarwin() {}
+
+// Instance methods
+
+Status NativeProcessDarwin::FinalizeLaunch(LaunchFlavor launch_flavor,
+                                           MainLoop &main_loop) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  error = StartExceptionThread();
+  if (!error.Success()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failure starting the "
+              "mach exception port monitor thread: %s",
+              __FUNCTION__, error.AsCString());
+
+    // Terminate the inferior process.  There's nothing meaningful we can do if
+    // we can't receive signals and exceptions.  Since we launched the process,
+    // it's fair game for us to kill it.
+    ::ptrace(PT_KILL, m_pid, 0, 0);
+    SetState(eStateExited);
+
+    return error;
+  }
+
+  StartSTDIOThread();
+
+  if (launch_flavor == LaunchFlavor::PosixSpawn) {
+    SetState(eStateAttaching);
+    errno = 0;
+    int err = ::ptrace(PT_ATTACHEXC, m_pid, 0, 0);
+    if (err == 0) {
+      // m_flags |= eMachProcessFlagsAttached;
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): successfully spawned "
+                "process with pid %" PRIu64,
+                __FUNCTION__, m_pid);
+    } else {
+      error.SetErrorToErrno();
+      SetState(eStateExited);
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): error: failed to "
+                "attach to spawned pid %" PRIu64 " (error=%d (%s))",
+                __FUNCTION__, m_pid, (int)error.GetError(), error.AsCString());
+      return error;
+    }
+  }
+
+  LLDB_LOGF(log, "NativeProcessDarwin::%s(): new pid is %" PRIu64 "...",
+            __FUNCTION__, m_pid);
+
+  // Spawn a thread to reap our child inferior process...
+  error = StartWaitpidThread(main_loop);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to start waitpid() "
+              "thread: %s",
+              __FUNCTION__, error.AsCString());
+    kill(SIGKILL, static_cast<::pid_t>(m_pid));
+    return error;
+  }
+
+  if (TaskPortForProcessID(error) == TASK_NULL) {
+    // We failed to get the task for our process ID which is bad. Kill our
+    // process; otherwise, it will be stopped at the entry point and get
+    // reparented to someone else and never go away.
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): could not get task port "
+              "for process, sending SIGKILL and exiting: %s",
+              __FUNCTION__, error.AsCString());
+    kill(SIGKILL, static_cast<::pid_t>(m_pid));
+    return error;
+  }
+
+  // Indicate that we're stopped, as we always launch suspended.
+  SetState(eStateStopped);
+
+  // Success.
+  return error;
+}
+
+Status NativeProcessDarwin::SaveExceptionPortInfo() {
+  return m_exc_port_info.Save(m_task);
+}
+
+bool NativeProcessDarwin::ProcessUsingSpringBoard() const {
+  // TODO implement flags
+  // return (m_flags & eMachProcessFlagsUsingSBS) != 0;
+  return false;
+}
+
+bool NativeProcessDarwin::ProcessUsingBackBoard() const {
+  // TODO implement flags
+  // return (m_flags & eMachProcessFlagsUsingBKS) != 0;
+  return false;
+}
+
+// Called by the exception thread when an exception has been received from our
+// process. The exception message is completely filled and the exception data
+// has already been copied.
+void NativeProcessDarwin::ExceptionMessageReceived(
+    const MachException::Message &message) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  std::lock_guard<std::recursive_mutex> locker(m_exception_messages_mutex);
+  if (m_exception_messages.empty()) {
+    // Suspend the task the moment we receive our first exception message.
+    SuspendTask();
+  }
+
+  // Use a locker to automatically unlock our mutex in case of exceptions Add
+  // the exception to our internal exception stack
+  m_exception_messages.push_back(message);
+
+  LLDB_LOGF(log, "NativeProcessDarwin::%s(): new queued message count: %lu",
+            __FUNCTION__, m_exception_messages.size());
+}
+
+void *NativeProcessDarwin::ExceptionThread(void *arg) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+  if (!arg) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): cannot run mach exception "
+              "thread, mandatory process arg was null",
+              __FUNCTION__);
+    return nullptr;
+  }
+
+  return reinterpret_cast<NativeProcessDarwin *>(arg)->DoExceptionThread();
+}
+
+void *NativeProcessDarwin::DoExceptionThread() {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  LLDB_LOGF(log, "NativeProcessDarwin::%s(arg=%p) starting thread...",
+            __FUNCTION__, this);
+
+  pthread_setname_np("exception monitoring thread");
+
+  // Ensure we don't get CPU starved.
+  MaybeRaiseThreadPriority();
+
+  // We keep a count of the number of consecutive exceptions received so we
+  // know to grab all exceptions without a timeout. We do this to get a bunch
+  // of related exceptions on our exception port so we can process then
+  // together. When we have multiple threads, we can get an exception per
+  // thread and they will come in consecutively. The main loop in this thread
+  // can stop periodically if needed to service things related to this process.
+  //
+  // [did we lose some words here?]
+  //
+  // flag set in the options, so we will wait forever for an exception on
+  // 0 our exception port. After we get one exception, we then will use the
+  // MACH_RCV_TIMEOUT option with a zero timeout to grab all other current
+  // exceptions for our process. After we have received the last pending
+  // exception, we will get a timeout which enables us to then notify our main
+  // thread that we have an exception bundle available. We then wait for the
+  // main thread to tell this exception thread to start trying to get
+  // exceptions messages again and we start again with a mach_msg read with
+  // infinite timeout.
+  //
+  // We choose to park a thread on this, rather than polling, because the
+  // polling is expensive.  On devices, we need to minimize overhead caused by
+  // the process monitor.
+  uint32_t num_exceptions_received = 0;
+  Status error;
+  task_t task = m_task;
+  mach_msg_timeout_t periodic_timeout = 0;
+
+#if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS)
+  mach_msg_timeout_t watchdog_elapsed = 0;
+  mach_msg_timeout_t watchdog_timeout = 60 * 1000;
+  ::pid_t pid = (::pid_t)process->GetID();
+  CFReleaser<SBSWatchdogAssertionRef> watchdog;
+
+  if (process->ProcessUsingSpringBoard()) {
+    // Request a renewal for every 60 seconds if we attached using SpringBoard.
+    watchdog.reset(::SBSWatchdogAssertionCreateForPID(nullptr, pid, 60));
+    LLDB_LOGF(log,
+              "::SBSWatchdogAssertionCreateForPID(NULL, %4.4x, 60) "
+              "=> %p",
+              pid, watchdog.get());
+
+    if (watchdog.get()) {
+      ::SBSWatchdogAssertionRenew(watchdog.get());
+
+      CFTimeInterval watchdogRenewalInterval =
+          ::SBSWatchdogAssertionGetRenewalInterval(watchdog.get());
+      LLDB_LOGF(log,
+                "::SBSWatchdogAssertionGetRenewalInterval(%p) => "
+                "%g seconds",
+                watchdog.get(), watchdogRenewalInterval);
+      if (watchdogRenewalInterval > 0.0) {
+        watchdog_timeout = (mach_msg_timeout_t)watchdogRenewalInterval * 1000;
+        if (watchdog_timeout > 3000) {
+          // Give us a second to renew our timeout.
+          watchdog_timeout -= 1000;
+        } else if (watchdog_timeout > 1000) {
+          // Give us a quarter of a second to renew our timeout.
+          watchdog_timeout -= 250;
+        }
+      }
+    }
+    if (periodic_timeout == 0 || periodic_timeout > watchdog_timeout)
+      periodic_timeout = watchdog_timeout;
+  }
+#endif // #if defined (WITH_SPRINGBOARD) && !defined (WITH_BKS)
+
+#ifdef WITH_BKS
+  CFReleaser<BKSWatchdogAssertionRef> watchdog;
+  if (process->ProcessUsingBackBoard()) {
+    ::pid_t pid = process->GetID();
+    CFAllocatorRef alloc = kCFAllocatorDefault;
+    watchdog.reset(::BKSWatchdogAssertionCreateForPID(alloc, pid));
+  }
+#endif // #ifdef WITH_BKS
+
+  // Do we want to use a weak pointer to the NativeProcessDarwin here, in which
+  // case we can guarantee we don't whack the process monitor if we race
+  // between this thread and the main one on shutdown?
+  while (IsExceptionPortValid()) {
+    ::pthread_testcancel();
+
+    MachException::Message exception_message;
+
+    if (num_exceptions_received > 0) {
+      // We don't want a timeout here, just receive as many exceptions as we
+      // can since we already have one.  We want to get all currently available
+      // exceptions for this task at once.
+      error = exception_message.Receive(
+          GetExceptionPort(),
+          MACH_RCV_MSG | MACH_RCV_INTERRUPT | MACH_RCV_TIMEOUT, 0);
+    } else if (periodic_timeout > 0) {
+      // We need to stop periodically in this loop, so try and get a mach
+      // message with a valid timeout (ms).
+      error = exception_message.Receive(GetExceptionPort(),
+                                        MACH_RCV_MSG | MACH_RCV_INTERRUPT |
+                                            MACH_RCV_TIMEOUT,
+                                        periodic_timeout);
+    } else {
+      // We don't need to parse all current exceptions or stop periodically,
+      // just wait for an exception forever.
+      error = exception_message.Receive(GetExceptionPort(),
+                                        MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0);
+    }
+
+    if (error.Success()) {
+      // We successfully received an exception.
+      if (exception_message.CatchExceptionRaise(task)) {
+        ++num_exceptions_received;
+        ExceptionMessageReceived(exception_message);
+      }
+    } else {
+      if (error.GetError() == MACH_RCV_INTERRUPTED) {
+        // We were interrupted.
+
+        // If we have no task port we should exit this thread, as it implies
+        // the inferior went down.
+        if (!IsExceptionPortValid()) {
+          LLDB_LOGF(log,
+                    "NativeProcessDarwin::%s(): the inferior "
+                    "exception port is no longer valid, "
+                    "canceling exception thread...",
+                    __FUNCTION__);
+          // Should we be setting a process state here?
+          break;
+        }
+
+        // Make sure the inferior task is still valid.
+        if (IsTaskValid()) {
+          // Task is still ok.
+          LLDB_LOGF(log,
+                    "NativeProcessDarwin::%s(): interrupted, but "
+                    "the inferior task iss till valid, "
+                    "continuing...",
+                    __FUNCTION__);
+          continue;
+        } else {
+          // The inferior task is no longer valid.  Time to exit as the process
+          // has gone away.
+          LLDB_LOGF(log,
+                    "NativeProcessDarwin::%s(): the inferior task "
+                    "has exited, and so will we...",
+                    __FUNCTION__);
+          // Does this race at all with our waitpid()?
+          SetState(eStateExited);
+          break;
+        }
+      } else if (error.GetError() == MACH_RCV_TIMED_OUT) {
+        // We timed out when waiting for exceptions.
+
+        if (num_exceptions_received > 0) {
+          // We were receiving all current exceptions with a timeout of zero.
+          // It is time to go back to our normal looping mode.
+          num_exceptions_received = 0;
+
+          // Notify our main thread we have a complete exception message bundle
+          // available.  Get the possibly updated task port back from the
+          // process in case we exec'ed and our task port changed.
+          task = ExceptionMessageBundleComplete();
+
+          // In case we use a timeout value when getting exceptions, make sure
+          // our task is still valid.
+          if (IsTaskValid(task)) {
+            // Task is still ok.
+            LLDB_LOGF(log,
+                      "NativeProcessDarwin::%s(): got a timeout, "
+                      "continuing...",
+                      __FUNCTION__);
+            continue;
+          } else {
+            // The inferior task is no longer valid.  Time to exit as the
+            // process has gone away.
+            LLDB_LOGF(log,
+                      "NativeProcessDarwin::%s(): the inferior "
+                      "task has exited, and so will we...",
+                      __FUNCTION__);
+            // Does this race at all with our waitpid()?
+            SetState(eStateExited);
+            break;
+          }
+        }
+
+#if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS)
+        if (watchdog.get()) {
+          watchdog_elapsed += periodic_timeout;
+          if (watchdog_elapsed >= watchdog_timeout) {
+            LLDB_LOGF(log, "SBSWatchdogAssertionRenew(%p)", watchdog.get());
+            ::SBSWatchdogAssertionRenew(watchdog.get());
+            watchdog_elapsed = 0;
+          }
+        }
+#endif
+      } else {
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): continuing after "
+                  "receiving an unexpected error: %u (%s)",
+                  __FUNCTION__, error.GetError(), error.AsCString());
+        // TODO: notify of error?
+      }
+    }
+  }
+
+#if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS)
+  if (watchdog.get()) {
+    // TODO: change SBSWatchdogAssertionRelease to SBSWatchdogAssertionCancel
+    // when we
+    // all are up and running on systems that support it. The SBS framework has
+    // a #define that will forward SBSWatchdogAssertionRelease to
+    // SBSWatchdogAssertionCancel for now so it should still build either way.
+    DNBLogThreadedIf(LOG_TASK, "::SBSWatchdogAssertionRelease(%p)",
+                     watchdog.get());
+    ::SBSWatchdogAssertionRelease(watchdog.get());
+  }
+#endif // #if defined (WITH_SPRINGBOARD) && !defined (WITH_BKS)
+
+  LLDB_LOGF(log, "NativeProcessDarwin::%s(%p): thread exiting...", __FUNCTION__,
+            this);
+  return nullptr;
+}
+
+Status NativeProcessDarwin::StartExceptionThread() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+  LLDB_LOGF(log, "NativeProcessDarwin::%s() called", __FUNCTION__);
+
+  // Make sure we've looked up the inferior port.
+  TaskPortForProcessID(error);
+
+  // Ensure the inferior task is valid.
+  if (!IsTaskValid()) {
+    error.SetErrorStringWithFormat("cannot start exception thread: "
+                                   "task 0x%4.4x is not valid",
+                                   m_task);
+    return error;
+  }
+
+  // Get the mach port for the process monitor.
+  mach_port_t task_self = mach_task_self();
+
+  // Allocate an exception port that we will use to track our child process
+  auto mach_err = ::mach_port_allocate(task_self, MACH_PORT_RIGHT_RECEIVE,
+                                       &m_exception_port);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): mach_port_allocate("
+              "task_self=0x%4.4x, MACH_PORT_RIGHT_RECEIVE, "
+              "&m_exception_port) failed: %u (%s)",
+              __FUNCTION__, task_self, error.GetError(), error.AsCString());
+    return error;
+  }
+
+  // Add the ability to send messages on the new exception port
+  mach_err = ::mach_port_insert_right(
+      task_self, m_exception_port, m_exception_port, MACH_MSG_TYPE_MAKE_SEND);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): mach_port_insert_right("
+              "task_self=0x%4.4x, m_exception_port=0x%4.4x, "
+              "m_exception_port=0x%4.4x, MACH_MSG_TYPE_MAKE_SEND) "
+              "failed: %u (%s)",
+              __FUNCTION__, task_self, m_exception_port, m_exception_port,
+              error.GetError(), error.AsCString());
+    return error;
+  }
+
+  // Save the original state of the exception ports for our child process.
+  error = SaveExceptionPortInfo();
+  if (error.Fail() || (m_exc_port_info.mask == 0)) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): SaveExceptionPortInfo() "
+              "failed, cannot install exception handler: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+
+  // Set the ability to get all exceptions on this port.
+  mach_err = ::task_set_exception_ports(
+      m_task, m_exc_port_info.mask, m_exception_port,
+      EXCEPTION_DEFAULT | MACH_EXCEPTION_CODES, THREAD_STATE_NONE);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "::task_set_exception_ports (task = 0x%4.4x, "
+              "exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
+              "behavior = 0x%8.8x, new_flavor = 0x%8.8x) failed: "
+              "%u (%s)",
+              m_task, m_exc_port_info.mask, m_exception_port,
+              (EXCEPTION_DEFAULT | MACH_EXCEPTION_CODES), THREAD_STATE_NONE,
+              error.GetError(), error.AsCString());
+    return error;
+  }
+
+  // Create the exception thread.
+  auto pthread_err =
+      ::pthread_create(&m_exception_thread, nullptr, ExceptionThread, this);
+  error.SetError(pthread_err, eErrorTypePOSIX);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to create Mach "
+              "exception-handling thread: %u (%s)",
+              __FUNCTION__, error.GetError(), error.AsCString());
+  }
+
+  return error;
+}
+
+lldb::addr_t
+NativeProcessDarwin::GetDYLDAllImageInfosAddress(Status &error) const {
+  error.Clear();
+
+  struct hack_task_dyld_info dyld_info;
+  mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
+  // Make sure that COUNT isn't bigger than our hacked up struct
+  // hack_task_dyld_info.  If it is, then make COUNT smaller to match.
+  if (count > (sizeof(struct hack_task_dyld_info) / sizeof(natural_t))) {
+    count = (sizeof(struct hack_task_dyld_info) / sizeof(natural_t));
+  }
+
+  TaskPortForProcessID(error);
+  if (error.Fail())
+    return LLDB_INVALID_ADDRESS;
+
+  auto mach_err =
+      ::task_info(m_task, TASK_DYLD_INFO, (task_info_t)&dyld_info, &count);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+  if (error.Success()) {
+    // We now have the address of the all image infos structure.
+    return dyld_info.all_image_info_addr;
+  }
+
+  // We don't have it.
+  return LLDB_INVALID_ADDRESS;
+}
+
+uint32_t NativeProcessDarwin::GetCPUTypeForLocalProcess(::pid_t pid) {
+  int mib[CTL_MAXNAME] = {
+      0,
+  };
+  size_t len = CTL_MAXNAME;
+
+  if (::sysctlnametomib("sysctl.proc_cputype", mib, &len))
+    return 0;
+
+  mib[len] = pid;
+  len++;
+
+  cpu_type_t cpu;
+  size_t cpu_len = sizeof(cpu);
+  if (::sysctl(mib, static_cast<u_int>(len), &cpu, &cpu_len, 0, 0))
+    cpu = 0;
+  return cpu;
+}
+
+uint32_t NativeProcessDarwin::GetCPUType() const {
+  if (m_cpu_type == 0 && m_pid != 0)
+    m_cpu_type = GetCPUTypeForLocalProcess(m_pid);
+  return m_cpu_type;
+}
+
+task_t NativeProcessDarwin::ExceptionMessageBundleComplete() {
+  // We have a complete bundle of exceptions for our child process.
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  std::lock_guard<std::recursive_mutex> locker(m_exception_messages_mutex);
+  LLDB_LOGF(log,
+            "NativeProcessDarwin::%s(): processing %lu exception "
+            "messages.",
+            __FUNCTION__, m_exception_messages.size());
+
+  if (m_exception_messages.empty()) {
+    // Not particularly useful...
+    return m_task;
+  }
+
+  bool auto_resume = false;
+  m_did_exec = false;
+
+  // First check for any SIGTRAP and make sure we didn't exec
+  const task_t task = m_task;
+  size_t i;
+  if (m_pid != 0) {
+    bool received_interrupt = false;
+    uint32_t num_task_exceptions = 0;
+    for (i = 0; i < m_exception_messages.size(); ++i) {
+      if (m_exception_messages[i].state.task_port != task) {
+        // This is an exception that is not for our inferior, ignore.
+        continue;
+      }
+
+      // This is an exception for the inferior.
+      ++num_task_exceptions;
+      const int signo = m_exception_messages[i].state.SoftSignal();
+      if (signo == SIGTRAP) {
+        // SIGTRAP could mean that we exec'ed. We need to check the
+        // dyld all_image_infos.infoArray to see if it is NULL and if so, say
+        // that we exec'ed.
+        const addr_t aii_addr = GetDYLDAllImageInfosAddress(error);
+        if (aii_addr == LLDB_INVALID_ADDRESS)
+          break;
+
+        const addr_t info_array_count_addr = aii_addr + 4;
+        uint32_t info_array_count = 0;
+        size_t bytes_read = 0;
+        Status read_error;
+        read_error = ReadMemory(info_array_count_addr, // source addr
+                                &info_array_count,     // dest addr
+                                4,                     // byte count
+                                bytes_read);           // #bytes read
+        if (read_error.Success() && (bytes_read == 4)) {
+          if (info_array_count == 0) {
+            // We got the all infos address, and there are zero entries.  We
+            // think we exec'd.
+            m_did_exec = true;
+
+            // Force the task port to update itself in case the task port
+            // changed after exec
+            const task_t old_task = m_task;
+            const bool force_update = true;
+            const task_t new_task = TaskPortForProcessID(error, force_update);
+            if (old_task != new_task) {
+              LLDB_LOGF(log,
+                        "exec: inferior task port changed "
+                        "from 0x%4.4x to 0x%4.4x",
+                        old_task, new_task);
+            }
+          }
+        } else {
+          LLDB_LOGF(log,
+                    "NativeProcessDarwin::%s() warning: "
+                    "failed to read all_image_infos."
+                    "infoArrayCount from 0x%8.8llx",
+                    __FUNCTION__, info_array_count_addr);
+        }
+      } else if ((m_sent_interrupt_signo != 0) &&
+                 (signo == m_sent_interrupt_signo)) {
+        // We just received the interrupt that we sent to ourselves.
+        received_interrupt = true;
+      }
+    }
+
+    if (m_did_exec) {
+      cpu_type_t process_cpu_type = GetCPUTypeForLocalProcess(m_pid);
+      if (m_cpu_type != process_cpu_type) {
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): arch changed from "
+                  "0x%8.8x to 0x%8.8x",
+                  __FUNCTION__, m_cpu_type, process_cpu_type);
+        m_cpu_type = process_cpu_type;
+        // TODO figure out if we need to do something here.
+        // DNBArchProtocol::SetArchitecture (process_cpu_type);
+      }
+      m_thread_list.Clear();
+
+      // TODO hook up breakpoints.
+      // m_breakpoints.DisableAll();
+    }
+
+    if (m_sent_interrupt_signo != 0) {
+      if (received_interrupt) {
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): process "
+                  "successfully interrupted with signal %i",
+                  __FUNCTION__, m_sent_interrupt_signo);
+
+        // Mark that we received the interrupt signal
+        m_sent_interrupt_signo = 0;
+        // Now check if we had a case where:
+        // 1 - We called NativeProcessDarwin::Interrupt() but we stopped
+        //     for another reason.
+        // 2 - We called NativeProcessDarwin::Resume() (but still
+        //     haven't gotten the interrupt signal).
+        // 3 - We are now incorrectly stopped because we are handling
+        //     the interrupt signal we missed.
+        // 4 - We might need to resume if we stopped only with the
+        //     interrupt signal that we never handled.
+        if (m_auto_resume_signo != 0) {
+          // Only auto_resume if we stopped with _only_ the interrupt signal.
+          if (num_task_exceptions == 1) {
+            auto_resume = true;
+            LLDB_LOGF(log,
+                      "NativeProcessDarwin::%s(): auto "
+                      "resuming due to unhandled interrupt "
+                      "signal %i",
+                      __FUNCTION__, m_auto_resume_signo);
+          }
+          m_auto_resume_signo = 0;
+        }
+      } else {
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): didn't get signal "
+                  "%i after MachProcess::Interrupt()",
+                  __FUNCTION__, m_sent_interrupt_signo);
+      }
+    }
+  }
+
+  // Let all threads recover from stopping and do any clean up based on the
+  // previous thread state (if any).
+  m_thread_list.ProcessDidStop(*this);
+
+  // Let each thread know of any exceptions
+  for (i = 0; i < m_exception_messages.size(); ++i) {
+    // Let the thread list forward all exceptions on down to each thread.
+    if (m_exception_messages[i].state.task_port == task) {
+      // This exception is for our inferior.
+      m_thread_list.NotifyException(m_exception_messages[i].state);
+    }
+
+    if (log) {
+      StreamString stream;
+      m_exception_messages[i].Dump(stream);
+      stream.Flush();
+      log->PutCString(stream.GetString().c_str());
+    }
+  }
+
+  if (log) {
+    StreamString stream;
+    m_thread_list.Dump(stream);
+    stream.Flush();
+    log->PutCString(stream.GetString().c_str());
+  }
+
+  bool step_more = false;
+  if (m_thread_list.ShouldStop(step_more) && (auto_resume == false)) {
+// TODO - need to hook up event system here. !!!!
+#if 0
+        // Wait for the eEventProcessRunningStateChanged event to be reset
+        // before changing state to stopped to avoid race condition with very
+        // fast start/stops.
+        struct timespec timeout;
+
+        //DNBTimer::OffsetTimeOfDay(&timeout, 0, 250 * 1000);   // Wait for 250 ms
+        DNBTimer::OffsetTimeOfDay(&timeout, 1, 0);  // Wait for 250 ms
+        m_events.WaitForEventsToReset(eEventProcessRunningStateChanged,
+                                      &timeout);
+#endif
+    SetState(eStateStopped);
+  } else {
+    // Resume without checking our current state.
+    PrivateResume();
+  }
+
+  return m_task;
+}
+
+void NativeProcessDarwin::StartSTDIOThread() {
+  // TODO implement
+}
+
+Status NativeProcessDarwin::StartWaitpidThread(MainLoop &main_loop) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  // Strategy: create a thread that sits on waitpid(), waiting for the inferior
+  // process to die, reaping it in the process.  Arrange for the thread to have
+  // a pipe file descriptor that it can send a byte over when the waitpid
+  // completes.  Have the main loop have a read object for the other side of
+  // the pipe, and have the callback for the read do the process termination
+  // message sending.
+
+  // Create a single-direction communication channel.
+  const bool child_inherits = false;
+  error = m_waitpid_pipe.CreateNew(child_inherits);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to create waitpid "
+              "communication pipe: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+
+  // Hook up the waitpid reader callback.
+
+  // TODO make PipePOSIX derive from IOObject.  This is goofy here.
+  const bool transfer_ownership = false;
+  auto io_sp = IOObjectSP(new NativeFile(m_waitpid_pipe.GetReadFileDescriptor(),
+                                         transfer_ownership));
+  m_waitpid_reader_handle = main_loop.RegisterReadObject(
+      io_sp, [this](MainLoopBase &) { HandleWaitpidResult(); }, error);
+
+  // Create the thread.
+  auto pthread_err =
+      ::pthread_create(&m_waitpid_thread, nullptr, WaitpidThread, this);
+  error.SetError(pthread_err, eErrorTypePOSIX);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to create waitpid "
+              "handling thread: %u (%s)",
+              __FUNCTION__, error.GetError(), error.AsCString());
+    return error;
+  }
+
+  return error;
+}
+
+void *NativeProcessDarwin::WaitpidThread(void *arg) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+  if (!arg) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): cannot run waitpid "
+              "thread, mandatory process arg was null",
+              __FUNCTION__);
+    return nullptr;
+  }
+
+  return reinterpret_cast<NativeProcessDarwin *>(arg)->DoWaitpidThread();
+}
+
+void NativeProcessDarwin::MaybeRaiseThreadPriority() {
+#if defined(__arm__) || defined(__arm64__) || defined(__aarch64__)
+  struct sched_param thread_param;
+  int thread_sched_policy;
+  if (pthread_getschedparam(pthread_self(), &thread_sched_policy,
+                            &thread_param) == 0) {
+    thread_param.sched_priority = 47;
+    pthread_setschedparam(pthread_self(), thread_sched_policy, &thread_param);
+  }
+#endif
+}
+
+void *NativeProcessDarwin::DoWaitpidThread() {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  if (m_pid == LLDB_INVALID_PROCESS_ID) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): inferior process ID is "
+              "not set, cannot waitpid on it",
+              __FUNCTION__);
+    return nullptr;
+  }
+
+  // Name the thread.
+  pthread_setname_np("waitpid thread");
+
+  // Ensure we don't get CPU starved.
+  MaybeRaiseThreadPriority();
+
+  Status error;
+  int status = -1;
+
+  while (1) {
+    // Do a waitpid.
+    ::pid_t child_pid = ::waitpid(m_pid, &status, 0);
+    if (child_pid < 0)
+      error.SetErrorToErrno();
+    if (error.Fail()) {
+      if (error.GetError() == EINTR) {
+        // This is okay, we can keep going.
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): waitpid(pid = %" PRIu64
+                  ", &status, 0) interrupted, continuing",
+                  __FUNCTION__, m_pid);
+        continue;
+      }
+
+      // This error is not okay, abort.
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): waitpid(pid = %" PRIu64
+                ", &status, 0) aborting due to error: %u (%s)",
+                __FUNCTION__, m_pid, error.GetError(), error.AsCString());
+      break;
+    }
+
+    // Log the successful result.
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): waitpid(pid = %" PRIu64
+              ", &status, 0) => %i, status = %i",
+              __FUNCTION__, m_pid, child_pid, status);
+
+    // Handle the result.
+    if (WIFSTOPPED(status)) {
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): waitpid(pid = %" PRIu64
+                ") received a stop, continuing waitpid() loop",
+                __FUNCTION__, m_pid);
+      continue;
+    } else // if (WIFEXITED(status) || WIFSIGNALED(status))
+    {
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(pid = %" PRIu64 "): "
+                "waitpid thread is setting exit status for pid = "
+                "%i to %i",
+                __FUNCTION__, m_pid, child_pid, status);
+
+      error = SendInferiorExitStatusToMainLoop(child_pid, status);
+      return nullptr;
+    }
+  }
+
+  // We should never exit as long as our child process is alive.  If we get
+  // here, something completely unexpected went wrong and we should exit.
+  LLDB_LOGF(log,
+            "NativeProcessDarwin::%s(): internal error: waitpid thread "
+            "exited out of its main loop in an unexpected way. pid = %" PRIu64
+            ". Sending exit status of -1.",
+            __FUNCTION__, m_pid);
+
+  error = SendInferiorExitStatusToMainLoop((::pid_t)m_pid, -1);
+  return nullptr;
+}
+
+Status NativeProcessDarwin::SendInferiorExitStatusToMainLoop(::pid_t pid,
+                                                             int status) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  size_t bytes_written = 0;
+
+  // Send the pid.
+  error = m_waitpid_pipe.Write(&pid, sizeof(pid), bytes_written);
+  if (error.Fail() || (bytes_written < sizeof(pid))) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() - failed to write "
+              "waitpid exiting pid to the pipe.  Client will not "
+              "hear about inferior exit status!",
+              __FUNCTION__);
+    return error;
+  }
+
+  // Send the status.
+  bytes_written = 0;
+  error = m_waitpid_pipe.Write(&status, sizeof(status), bytes_written);
+  if (error.Fail() || (bytes_written < sizeof(status))) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() - failed to write "
+              "waitpid exit result to the pipe.  Client will not "
+              "hear about inferior exit status!",
+              __FUNCTION__);
+  }
+  return error;
+}
+
+Status NativeProcessDarwin::HandleWaitpidResult() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  // Read the pid.
+  const bool notify_status = true;
+
+  ::pid_t pid = -1;
+  size_t bytes_read = 0;
+  error = m_waitpid_pipe.Read(&pid, sizeof(pid), bytes_read);
+  if (error.Fail() || (bytes_read < sizeof(pid))) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() - failed to read "
+              "waitpid exiting pid from the pipe.  Will notify "
+              "as if parent process died with exit status -1.",
+              __FUNCTION__);
+    SetExitStatus(WaitStatus(WaitStatus::Exit, -1), notify_status);
+    return error;
+  }
+
+  // Read the status.
+  int status = -1;
+  error = m_waitpid_pipe.Read(&status, sizeof(status), bytes_read);
+  if (error.Fail() || (bytes_read < sizeof(status))) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s() - failed to read "
+              "waitpid exit status from the pipe.  Will notify "
+              "as if parent process died with exit status -1.",
+              __FUNCTION__);
+    SetExitStatus(WaitStatus(WaitStatus::Exit, -1), notify_status);
+    return error;
+  }
+
+  // Notify the monitor that our state has changed.
+  LLDB_LOGF(log,
+            "NativeProcessDarwin::%s(): main loop received waitpid "
+            "exit status info: pid=%i (%s), status=%i",
+            __FUNCTION__, pid,
+            (pid == m_pid) ? "the inferior" : "not the inferior", status);
+
+  SetExitStatus(WaitStatus::Decode(status), notify_status);
+  return error;
+}
+
+task_t NativeProcessDarwin::TaskPortForProcessID(Status &error,
+                                                 bool force) const {
+  if ((m_task == TASK_NULL) || force) {
+    Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+    if (m_pid == LLDB_INVALID_PROCESS_ID) {
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): cannot get task due "
+                "to invalid pid",
+                __FUNCTION__);
+      return TASK_NULL;
+    }
+
+    const uint32_t num_retries = 10;
+    const uint32_t usec_interval = 10000;
+
+    mach_port_t task_self = mach_task_self();
+    task_t task = TASK_NULL;
+
+    for (uint32_t i = 0; i < num_retries; i++) {
+      kern_return_t err = ::task_for_pid(task_self, m_pid, &task);
+      if (err == 0) {
+        // Succeeded.  Save and return it.
+        error.Clear();
+        m_task = task;
+        LLDB_LOGF(log,
+                  "NativeProcessDarwin::%s(): ::task_for_pid("
+                  "stub_port = 0x%4.4x, pid = %llu, &task) "
+                  "succeeded: inferior task port = 0x%4.4x",
+                  __FUNCTION__, task_self, m_pid, m_task);
+        return m_task;
+      } else {
+        // Failed to get the task for the inferior process.
+        error.SetError(err, eErrorTypeMachKernel);
+        if (log) {
+          LLDB_LOGF(log,
+                    "NativeProcessDarwin::%s(): ::task_for_pid("
+                    "stub_port = 0x%4.4x, pid = %llu, &task) "
+                    "failed, err = 0x%8.8x (%s)",
+                    __FUNCTION__, task_self, m_pid, err, error.AsCString());
+        }
+      }
+
+      // Sleep a bit and try again
+      ::usleep(usec_interval);
+    }
+
+    // We failed to get the task for the inferior process. Ensure that it is
+    // cleared out.
+    m_task = TASK_NULL;
+  }
+  return m_task;
+}
+
+void NativeProcessDarwin::AttachToInferior(MainLoop &mainloop, lldb::pid_t pid,
+                                           Status &error) {
+  error.SetErrorString("TODO: implement");
+}
+
+Status NativeProcessDarwin::PrivateResume() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  std::lock_guard<std::recursive_mutex> locker(m_exception_messages_mutex);
+  m_auto_resume_signo = m_sent_interrupt_signo;
+
+  if (log) {
+    if (m_auto_resume_signo)
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): task 0x%x resuming (with "
+                "unhandled interrupt signal %i)...",
+                __FUNCTION__, m_task, m_auto_resume_signo);
+    else
+      LLDB_LOGF(log, "NativeProcessDarwin::%s(): task 0x%x resuming...",
+                __FUNCTION__, m_task);
+  }
+
+  error = ReplyToAllExceptions();
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): aborting, failed to "
+              "reply to exceptions: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+  //    bool stepOverBreakInstruction = step;
+
+  // Let the thread prepare to resume and see if any threads want us to step
+  // over a breakpoint instruction (ProcessWillResume will modify the value of
+  // stepOverBreakInstruction).
+  m_thread_list.ProcessWillResume(*this, m_thread_actions);
+
+  // Set our state accordingly
+  if (m_thread_actions.NumActionsWithState(eStateStepping))
+    SetState(eStateStepping);
+  else
+    SetState(eStateRunning);
+
+  // Now resume our task.
+  error = ResumeTask();
+  return error;
+}
+
+Status NativeProcessDarwin::ReplyToAllExceptions() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+
+  TaskPortForProcessID(error);
+  if (error.Fail()) {
+    LLDB_LOGF(log, "NativeProcessDarwin::%s(): no task port, aborting",
+              __FUNCTION__);
+    return error;
+  }
+
+  std::lock_guard<std::recursive_mutex> locker(m_exception_messages_mutex);
+  if (m_exception_messages.empty()) {
+    // We're done.
+    return error;
+  }
+
+  size_t index = 0;
+  for (auto &message : m_exception_messages) {
+    if (log) {
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): replying to exception "
+                "%zu...",
+                __FUNCTION__, index++);
+    }
+
+    int thread_reply_signal = 0;
+
+    const tid_t tid =
+        m_thread_list.GetThreadIDByMachPortNumber(message.state.thread_port);
+    const ResumeAction *action = nullptr;
+    if (tid != LLDB_INVALID_THREAD_ID)
+      action = m_thread_actions.GetActionForThread(tid, false);
+
+    if (action) {
+      thread_reply_signal = action->signal;
+      if (thread_reply_signal)
+        m_thread_actions.SetSignalHandledForThread(tid);
+    }
+
+    error = message.Reply(m_pid, m_task, thread_reply_signal);
+    if (error.Fail() && log) {
+      // We log any error here, but we don't stop the exception response
+      // handling.
+      LLDB_LOGF(log,
+                "NativeProcessDarwin::%s(): failed to reply to "
+                "exception: %s",
+                __FUNCTION__, error.AsCString());
+      error.Clear();
+    }
+  }
+
+  // Erase all exception message as we should have used and replied to them all
+  // already.
+  m_exception_messages.clear();
+  return error;
+}
+
+Status NativeProcessDarwin::ResumeTask() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  TaskPortForProcessID(error);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to get task port "
+              "for process when attempting to resume: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+  if (m_task == TASK_NULL) {
+    error.SetErrorString("task port retrieval succeeded but task port is "
+                         "null when attempting to resume the task");
+    return error;
+  }
+
+  LLDB_LOGF(log,
+            "NativeProcessDarwin::%s(): requesting resume of task "
+            "0x%4.4x",
+            __FUNCTION__, m_task);
+
+  // Get the BasicInfo struct to verify that we're suspended before we try to
+  // resume the task.
+  struct task_basic_info task_info;
+  error = GetTaskBasicInfo(m_task, &task_info);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): failed to get task "
+              "BasicInfo when attempting to resume: %s",
+              __FUNCTION__, error.AsCString());
+    return error;
+  }
+
+  // task_resume isn't counted like task_suspend calls are, so if the task is
+  // not suspended, don't try and resume it since it is already running
+  if (task_info.suspend_count > 0) {
+    auto mach_err = ::task_resume(m_task);
+    error.SetError(mach_err, eErrorTypeMachKernel);
+    if (log) {
+      if (error.Success())
+        LLDB_LOGF(log, "::task_resume(target_task = 0x%4.4x): success", m_task);
+      else
+        LLDB_LOGF(log, "::task_resume(target_task = 0x%4.4x) error: %s", m_task,
+                  error.AsCString());
+    }
+  } else {
+    LLDB_LOGF(log,
+              "::task_resume(target_task = 0x%4.4x): ignored, "
+              "already running",
+              m_task);
+  }
+
+  return error;
+}
+
+bool NativeProcessDarwin::IsTaskValid() const {
+  if (m_task == TASK_NULL)
+    return false;
+
+  struct task_basic_info task_info;
+  return GetTaskBasicInfo(m_task, &task_info).Success();
+}
+
+bool NativeProcessDarwin::IsTaskValid(task_t task) const {
+  if (task == TASK_NULL)
+    return false;
+
+  struct task_basic_info task_info;
+  return GetTaskBasicInfo(task, &task_info).Success();
+}
+
+mach_port_t NativeProcessDarwin::GetExceptionPort() const {
+  return m_exception_port;
+}
+
+bool NativeProcessDarwin::IsExceptionPortValid() const {
+  return MACH_PORT_VALID(m_exception_port);
+}
+
+Status
+NativeProcessDarwin::GetTaskBasicInfo(task_t task,
+                                      struct task_basic_info *info) const {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  // Validate args.
+  if (info == NULL) {
+    error.SetErrorStringWithFormat("NativeProcessDarwin::%s(): mandatory "
+                                   "info arg is null",
+                                   __FUNCTION__);
+    return error;
+  }
+
+  // Grab the task if we don't already have it.
+  if (task == TASK_NULL) {
+    error.SetErrorStringWithFormat("NativeProcessDarwin::%s(): given task "
+                                   "is invalid",
+                                   __FUNCTION__);
+  }
+
+  mach_msg_type_number_t count = TASK_BASIC_INFO_COUNT;
+  auto err = ::task_info(m_task, TASK_BASIC_INFO, (task_info_t)info, &count);
+  error.SetError(err, eErrorTypeMachKernel);
+  if (error.Fail()) {
+    LLDB_LOGF(log,
+              "::task_info(target_task = 0x%4.4x, "
+              "flavor = TASK_BASIC_INFO, task_info_out => %p, "
+              "task_info_outCnt => %u) failed: %u (%s)",
+              m_task, info, count, error.GetError(), error.AsCString());
+    return error;
+  }
+
+  Log *verbose_log(
+      GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
+  if (verbose_log) {
+    float user = (float)info->user_time.seconds +
+                 (float)info->user_time.microseconds / 1000000.0f;
+    float system = (float)info->user_time.seconds +
+                   (float)info->user_time.microseconds / 1000000.0f;
+    verbose_LLDB_LOGF(log,
+                      "task_basic_info = { suspend_count = %i, "
+                      "virtual_size = 0x%8.8llx, resident_size = "
+                      "0x%8.8llx, user_time = %f, system_time = %f }",
+                      info->suspend_count, (uint64_t)info->virtual_size,
+                      (uint64_t)info->resident_size, user, system);
+  }
+  return error;
+}
+
+Status NativeProcessDarwin::SuspendTask() {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  if (m_task == TASK_NULL) {
+    error.SetErrorString("task port is null, cannot suspend task");
+    LLDB_LOGF(log, "NativeProcessDarwin::%s() failed: %s", __FUNCTION__,
+              error.AsCString());
+    return error;
+  }
+
+  auto mach_err = ::task_suspend(m_task);
+  error.SetError(mach_err, eErrorTypeMachKernel);
+  if (error.Fail() && log)
+    LLDB_LOGF(log, "::task_suspend(target_task = 0x%4.4x)", m_task);
+
+  return error;
+}
+
+Status NativeProcessDarwin::Resume(const ResumeActionList &resume_actions) {
+  Status error;
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
+
+  LLDB_LOGF(log, "NativeProcessDarwin::%s() called", __FUNCTION__);
+
+  if (CanResume()) {
+    m_thread_actions = resume_actions;
+    error = PrivateResume();
+    return error;
+  }
+
+  auto state = GetState();
+  if (state == eStateRunning) {
+    LLDB_LOGF(log,
+              "NativeProcessDarwin::%s(): task 0x%x is already "
+              "running, ignoring...",
+              __FUNCTION__, TaskPortForProcessID(error));
+    return error;
+  }
+
+  // We can't resume from this state.
+  error.SetErrorStringWithFormat("task 0x%x has state %s, can't resume",
+                                 TaskPortForProcessID(error),
+                                 StateAsCString(state));
+  return error;
+}
+
+Status NativeProcessDarwin::Halt() {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::Detach() {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::Signal(int signo) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::Interrupt() {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::Kill() {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::GetMemoryRegionInfo(lldb::addr_t load_addr,
+                                                MemoryRegionInfo &range_info) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::ReadMemory(lldb::addr_t addr, void *buf,
+                                       size_t size, size_t &bytes_read) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf,
+                                                  size_t size,
+                                                  size_t &bytes_read) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::WriteMemory(lldb::addr_t addr, const void *buf,
+                                        size_t size, size_t &bytes_written) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::AllocateMemory(size_t size, uint32_t permissions,
+                                           lldb::addr_t &addr) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::DeallocateMemory(lldb::addr_t addr) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+lldb::addr_t NativeProcessDarwin::GetSharedLibraryInfoAddress() {
+  return LLDB_INVALID_ADDRESS;
+}
+
+size_t NativeProcessDarwin::UpdateThreads() { return 0; }
+
+bool NativeProcessDarwin::GetArchitecture(ArchSpec &arch) const {
+  return false;
+}
+
+Status NativeProcessDarwin::SetBreakpoint(lldb::addr_t addr, uint32_t size,
+                                          bool hardware) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+void NativeProcessDarwin::DoStopIDBumped(uint32_t newBumpId) {}
+
+Status NativeProcessDarwin::GetLoadedModuleFileSpec(const char *module_path,
+                                                    FileSpec &file_spec) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+Status NativeProcessDarwin::GetFileLoadAddress(const llvm::StringRef &file_name,
+                                               lldb::addr_t &load_addr) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
+
+// NativeProcessProtocol protected interface
+Status NativeProcessDarwin::GetSoftwareBreakpointTrapOpcode(
+    size_t trap_opcode_size_hint, size_t &actual_opcode_size,
+    const uint8_t *&trap_opcode_bytes) {
+  Status error;
+  error.SetErrorString("TODO: implement");
+  return error;
+}
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.h
new file mode 100644
index 00000000000..6741d4ddc5d
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeProcessDarwin.h
@@ -0,0 +1,337 @@
+//===-- NativeProcessDarwin.h --------------------------------- -*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef NativeProcessDarwin_h
+#define NativeProcessDarwin_h
+
+// NOTE: this code should only be compiled on Apple Darwin systems.  It is
+// not cross-platform code and is not intended to build on any other platform.
+// Therefore, platform-specific headers and code are okay here.
+
+// C includes
+#include <mach/mach_types.h>
+
+// C++ includes
+#include <mutex>
+#include <unordered_set>
+
+#include "lldb/Host/Debug.h"
+#include "lldb/Host/HostThread.h"
+#include "lldb/Host/Pipe.h"
+#include "lldb/Host/common/NativeProcessProtocol.h"
+#include "lldb/Target/MemoryRegionInfo.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/FileSpec.h"
+#include "lldb/lldb-types.h"
+
+#include "LaunchFlavor.h"
+#include "MachException.h"
+#include "NativeThreadDarwin.h"
+#include "NativeThreadListDarwin.h"
+
+namespace lldb_private {
+class Status;
+class Scalar;
+
+namespace process_darwin {
+
+/// \class NativeProcessDarwin
+/// Manages communication with the inferior (debugee) process.
+///
+/// Upon construction, this class prepares and launches an inferior process
+/// for debugging.
+///
+/// Changes in the inferior process state are broadcasted.
+class NativeProcessDarwin : public NativeProcessProtocol {
+  friend Status NativeProcessProtocol::Launch(
+      ProcessLaunchInfo &launch_info, NativeDelegate &native_delegate,
+      MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
+
+  friend Status NativeProcessProtocol::Attach(
+      lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
+      MainLoop &mainloop, NativeProcessProtocolSP &process_sp);
+
+public:
+  ~NativeProcessDarwin() override;
+
+  // NativeProcessProtocol Interface
+  Status Resume(const ResumeActionList &resume_actions) override;
+
+  Status Halt() override;
+
+  Status Detach() override;
+
+  Status Signal(int signo) override;
+
+  Status Interrupt() override;
+
+  Status Kill() override;
+
+  Status GetMemoryRegionInfo(lldb::addr_t load_addr,
+                             MemoryRegionInfo &range_info) override;
+
+  Status ReadMemory(lldb::addr_t addr, void *buf, size_t size,
+                    size_t &bytes_read) override;
+
+  Status ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf, size_t size,
+                               size_t &bytes_read) override;
+
+  Status WriteMemory(lldb::addr_t addr, const void *buf, size_t size,
+                     size_t &bytes_written) override;
+
+  Status AllocateMemory(size_t size, uint32_t permissions,
+                        lldb::addr_t &addr) override;
+
+  Status DeallocateMemory(lldb::addr_t addr) override;
+
+  lldb::addr_t GetSharedLibraryInfoAddress() override;
+
+  size_t UpdateThreads() override;
+
+  bool GetArchitecture(ArchSpec &arch) const override;
+
+  Status SetBreakpoint(lldb::addr_t addr, uint32_t size,
+                       bool hardware) override;
+
+  void DoStopIDBumped(uint32_t newBumpId) override;
+
+  Status GetLoadedModuleFileSpec(const char *module_path,
+                                 FileSpec &file_spec) override;
+
+  Status GetFileLoadAddress(const llvm::StringRef &file_name,
+                            lldb::addr_t &load_addr) override;
+
+  NativeThreadDarwinSP GetThreadByID(lldb::tid_t id);
+
+  task_t GetTask() const { return m_task; }
+
+  // Interface used by NativeRegisterContext-derived classes.
+  static Status PtraceWrapper(int req, lldb::pid_t pid, void *addr = nullptr,
+                              void *data = nullptr, size_t data_size = 0,
+                              long *result = nullptr);
+
+  bool SupportHardwareSingleStepping() const;
+
+protected:
+  // NativeProcessProtocol protected interface
+  Status
+  GetSoftwareBreakpointTrapOpcode(size_t trap_opcode_size_hint,
+                                  size_t &actual_opcode_size,
+                                  const uint8_t *&trap_opcode_bytes) override;
+
+private:
+  /// Mach task-related Member Variables
+
+  // The task port for the inferior process.
+  mutable task_t m_task;
+
+  // True if the inferior process did an exec since we started
+  // monitoring it.
+  bool m_did_exec;
+
+  // The CPU type of this process.
+  mutable cpu_type_t m_cpu_type;
+
+  /// Exception/Signal Handling Member Variables
+
+  // Exception port on which we will receive child exceptions
+  mach_port_t m_exception_port;
+
+  // Saved state of the child exception port prior to us installing
+  // our own intercepting port.
+  MachException::PortInfo m_exc_port_info;
+
+  // The thread that runs the Mach exception read and reply handler.
+  pthread_t m_exception_thread;
+
+  // TODO see if we can remove this if we get the exception collection
+  // and distribution to happen in a single-threaded fashion.
+  std::recursive_mutex m_exception_messages_mutex;
+
+  // A collection of exception messages caught when listening to the
+  // exception port.
+  MachException::Message::collection m_exception_messages;
+
+  // When we call MachProcess::Interrupt(), we want to send this
+  // signal (if non-zero).
+  int m_sent_interrupt_signo;
+
+  // If we resume the process and still haven't received our
+  // interrupt signal (if this is non-zero).
+  int m_auto_resume_signo;
+
+  /// Thread-related Member Variables
+  NativeThreadListDarwin m_thread_list;
+  ResumeActionList m_thread_actions;
+
+  /// Process Lifetime Member Variable
+
+  // The pipe over which the waitpid thread and the main loop will
+  // communicate.
+  Pipe m_waitpid_pipe;
+
+  // The thread that runs the waitpid handler.
+  pthread_t m_waitpid_thread;
+
+  // waitpid reader callback handle.
+  MainLoop::ReadHandleUP m_waitpid_reader_handle;
+
+  // Private Instance Methods
+  NativeProcessDarwin(lldb::pid_t pid, int pty_master_fd);
+
+  /// Finalize the launch.
+  ///
+  /// This method associates the NativeProcessDarwin instance with the host
+  /// process that was just launched.  It peforms actions like attaching a
+  /// listener to the inferior exception port, ptracing the process, and the
+  /// like.
+  ///
+  /// \param[in] launch_flavor
+  ///     The launch flavor that was used to launch the process.
+  ///
+  /// \param[in] main_loop
+  ///     The main loop that will run the process monitor.  Work
+  ///     that needs to be done (e.g. reading files) gets registered
+  ///     here along with callbacks to process the work.
+  ///
+  /// \return
+  ///     Any error that occurred during the aforementioned
+  ///     operations.  Failure here will force termination of the
+  ///     launched process and debugging session.
+  Status FinalizeLaunch(LaunchFlavor launch_flavor, MainLoop &main_loop);
+
+  Status SaveExceptionPortInfo();
+
+  void ExceptionMessageReceived(const MachException::Message &message);
+
+  void MaybeRaiseThreadPriority();
+
+  Status StartExceptionThread();
+
+  Status SendInferiorExitStatusToMainLoop(::pid_t pid, int status);
+
+  Status HandleWaitpidResult();
+
+  bool ProcessUsingSpringBoard() const;
+
+  bool ProcessUsingBackBoard() const;
+
+  static void *ExceptionThread(void *arg);
+
+  void *DoExceptionThread();
+
+  lldb::addr_t GetDYLDAllImageInfosAddress(Status &error) const;
+
+  static uint32_t GetCPUTypeForLocalProcess(::pid_t pid);
+
+  uint32_t GetCPUType() const;
+
+  task_t ExceptionMessageBundleComplete();
+
+  void StartSTDIOThread();
+
+  Status StartWaitpidThread(MainLoop &main_loop);
+
+  static void *WaitpidThread(void *arg);
+
+  void *DoWaitpidThread();
+
+  task_t TaskPortForProcessID(Status &error, bool force = false) const;
+
+  /// Attaches to an existing process.  Forms the implementation of
+  /// Process::DoAttach.
+  void AttachToInferior(MainLoop &mainloop, lldb::pid_t pid, Status &error);
+
+  ::pid_t Attach(lldb::pid_t pid, Status &error);
+
+  Status PrivateResume();
+
+  Status ReplyToAllExceptions();
+
+  Status ResumeTask();
+
+  bool IsTaskValid() const;
+
+  bool IsTaskValid(task_t task) const;
+
+  mach_port_t GetExceptionPort() const;
+
+  bool IsExceptionPortValid() const;
+
+  Status GetTaskBasicInfo(task_t task, struct task_basic_info *info) const;
+
+  Status SuspendTask();
+
+  static Status SetDefaultPtraceOpts(const lldb::pid_t);
+
+  static void *MonitorThread(void *baton);
+
+  void MonitorCallback(lldb::pid_t pid, bool exited, int signal, int status);
+
+  void WaitForNewThread(::pid_t tid);
+
+  void MonitorSIGTRAP(const siginfo_t &info, NativeThreadDarwin &thread);
+
+  void MonitorTrace(NativeThreadDarwin &thread);
+
+  void MonitorBreakpoint(NativeThreadDarwin &thread);
+
+  void MonitorWatchpoint(NativeThreadDarwin &thread, uint32_t wp_index);
+
+  void MonitorSignal(const siginfo_t &info, NativeThreadDarwin &thread,
+                     bool exited);
+
+  Status SetupSoftwareSingleStepping(NativeThreadDarwin &thread);
+
+  bool HasThreadNoLock(lldb::tid_t thread_id);
+
+  bool StopTrackingThread(lldb::tid_t thread_id);
+
+  NativeThreadDarwinSP AddThread(lldb::tid_t thread_id);
+
+  Status GetSoftwareBreakpointPCOffset(uint32_t &actual_opcode_size);
+
+  Status FixupBreakpointPCAsNeeded(NativeThreadDarwin &thread);
+
+  /// Writes a siginfo_t structure corresponding to the given thread
+  /// ID to the memory region pointed to by \p siginfo.
+  Status GetSignalInfo(lldb::tid_t tid, void *siginfo);
+
+  /// Writes the raw event message code (vis-a-vis PTRACE_GETEVENTMSG)
+  /// corresponding to the given thread ID to the memory pointed to by @p
+  /// message.
+  Status GetEventMessage(lldb::tid_t tid, unsigned long *message);
+
+  void NotifyThreadDeath(lldb::tid_t tid);
+
+  Status Detach(lldb::tid_t tid);
+
+  // This method is requests a stop on all threads which are still
+  // running. It sets up a deferred delegate notification, which will
+  // fire once threads report as stopped. The triggerring_tid will be
+  // set as the current thread (main stop reason).
+  void StopRunningThreads(lldb::tid_t triggering_tid);
+
+  // Notify the delegate if all threads have stopped.
+  void SignalIfAllThreadsStopped();
+
+  // Resume the given thread, optionally passing it the given signal.
+  // The type of resume operation (continue, single-step) depends on
+  // the state parameter.
+  Status ResumeThread(NativeThreadDarwin &thread, lldb::StateType state,
+                      int signo);
+
+  void ThreadWasCreated(NativeThreadDarwin &thread);
+
+  void SigchldHandler();
+};
+
+} // namespace process_darwin
+} // namespace lldb_private
+
+#endif /* NativeProcessDarwin_h */
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.cpp
new file mode 100644
index 00000000000..bcd6d8c2c4c
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.cpp
@@ -0,0 +1,281 @@
+//===-- NativeThreadDarwin.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
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadDarwin.h"
+
+// C includes
+#include <libproc.h>
+
+// LLDB includes
+#include "lldb/Utility/Stream.h"
+
+#include "NativeProcessDarwin.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+
+uint64_t NativeThreadDarwin::GetGloballyUniqueThreadIDForMachPortID(
+    ::thread_t mach_port_id) {
+  thread_identifier_info_data_t tident;
+  mach_msg_type_number_t tident_count = THREAD_IDENTIFIER_INFO_COUNT;
+
+  auto mach_err = ::thread_info(mach_port_id, THREAD_IDENTIFIER_INFO,
+                                (thread_info_t)&tident, &tident_count);
+  if (mach_err != KERN_SUCCESS) {
+    // When we fail to get thread info for the supposed port, assume it is
+    // really a globally unique thread id already, or return the best thing we
+    // can, which is the thread port.
+    return mach_port_id;
+  }
+  return tident.thread_id;
+}
+
+NativeThreadDarwin::NativeThreadDarwin(NativeProcessDarwin *process,
+                                       bool is_64_bit,
+                                       lldb::tid_t unique_thread_id,
+                                       ::thread_t mach_thread_port)
+    : NativeThreadProtocol(process, unique_thread_id),
+      m_mach_thread_port(mach_thread_port), m_basic_info(),
+      m_proc_threadinfo() {}
+
+bool NativeThreadDarwin::GetIdentifierInfo() {
+  // Don't try to get the thread info once and cache it for the life of the
+  // thread.  It changes over time, for instance if the thread name changes,
+  // then the thread_handle also changes...  So you have to refetch it every
+  // time.
+  mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
+  kern_return_t kret = ::thread_info(m_mach_thread_port, THREAD_IDENTIFIER_INFO,
+                                     (thread_info_t)&m_ident_info, &count);
+  return kret == KERN_SUCCESS;
+
+  return false;
+}
+
+std::string NativeThreadDarwin::GetName() {
+  std::string name;
+
+  if (GetIdentifierInfo()) {
+    auto process_sp = GetProcess();
+    if (!process_sp) {
+      name = "<unavailable>";
+      return name;
+    }
+
+    int len = ::proc_pidinfo(process_sp->GetID(), PROC_PIDTHREADINFO,
+                             m_ident_info.thread_handle, &m_proc_threadinfo,
+                             sizeof(m_proc_threadinfo));
+
+    if (len && m_proc_threadinfo.pth_name[0])
+      name = m_proc_threadinfo.pth_name;
+  }
+  return name;
+}
+
+lldb::StateType NativeThreadDarwin::GetState() {
+  // TODO implement
+  return eStateInvalid;
+}
+
+bool NativeThreadDarwin::GetStopReason(ThreadStopInfo &stop_info,
+                                       std::string &description) {
+  // TODO implement
+  return false;
+}
+
+NativeRegisterContextSP NativeThreadDarwin::GetRegisterContext() {
+  // TODO implement
+  return NativeRegisterContextSP();
+}
+
+Status NativeThreadDarwin::SetWatchpoint(lldb::addr_t addr, size_t size,
+                                         uint32_t watch_flags, bool hardware) {
+  Status error;
+  error.SetErrorString("not yet implemented");
+  return error;
+}
+
+Status NativeThreadDarwin::RemoveWatchpoint(lldb::addr_t addr) {
+  Status error;
+  error.SetErrorString("not yet implemented");
+  return error;
+}
+
+void NativeThreadDarwin::Dump(Stream &stream) const {
+// This is what we really want once we have the thread class wired up.
+#if 0
+    DNBLogThreaded("[%3u] #%3u tid: 0x%8.8" PRIx64 ", pc: 0x%16.16" PRIx64 ", sp: 0x%16.16" PRIx64 ", user: %d.%6.6d, system: %d.%6.6d, cpu: %2d, policy: %2d, run_state: %2d (%s), flags: %2d, suspend_count: %2d (current %2d), sleep_time: %d",
+                   index,
+                   m_seq_id,
+                   m_unique_id,
+                   GetPC(INVALID_NUB_ADDRESS),
+                   GetSP(INVALID_NUB_ADDRESS),
+                   m_basic_info.user_time.seconds,      m_basic_info.user_time.microseconds,
+                   m_basic_info.system_time.seconds,    m_basic_info.system_time.microseconds,
+                   m_basic_info.cpu_usage,
+                   m_basic_info.policy,
+                   m_basic_info.run_state,
+                   thread_run_state,
+                   m_basic_info.flags,
+                   m_basic_info.suspend_count, m_suspend_count,
+                   m_basic_info.sleep_time);
+
+#else
+  // Here's all we have right now.
+  stream.Printf("tid: 0x%8.8" PRIx64 ", thread port: 0x%4.4x", GetID(),
+                m_mach_thread_port);
+#endif
+}
+
+bool NativeThreadDarwin::NotifyException(MachException::Data &exc) {
+// TODO implement this.
+#if 0
+    // Allow the arch specific protocol to process (MachException::Data &)exc
+    // first before possible reassignment of m_stop_exception with exc. See
+    // also MachThread::GetStopException().
+    bool handled = m_arch_up->NotifyException(exc);
+
+    if (m_stop_exception.IsValid())
+    {
+        // We may have more than one exception for a thread, but we need to
+        // only remember the one that we will say is the reason we stopped. We
+        // may have been single stepping and also gotten a signal exception, so
+        // just remember the most pertinent one.
+        if (m_stop_exception.IsBreakpoint())
+            m_stop_exception = exc;
+    }
+    else
+    {
+        m_stop_exception = exc;
+    }
+
+    return handled;
+#else
+  // Pretend we handled it.
+  return true;
+#endif
+}
+
+bool NativeThreadDarwin::ShouldStop(bool &step_more) const {
+// TODO: implement this
+#if 0
+    // See if this thread is at a breakpoint?
+    DNBBreakpoint *bp = CurrentBreakpoint();
+
+    if (bp)
+    {
+        // This thread is sitting at a breakpoint, ask the breakpoint if we
+        // should be stopping here.
+        return true;
+    }
+    else
+    {
+        if (m_arch_up->StepNotComplete())
+        {
+            step_more = true;
+            return false;
+        }
+        // The thread state is used to let us know what the thread was trying
+        // to do. MachThread::ThreadWillResume() will set the thread state to
+        // various values depending if the thread was the current thread and if
+        // it was to be single stepped, or resumed.
+        if (GetState() == eStateRunning)
+        {
+            // If our state is running, then we should continue as we are in
+            // the process of stepping over a breakpoint.
+            return false;
+        }
+        else
+        {
+            // Stop if we have any kind of valid exception for this thread.
+            if (GetStopException().IsValid())
+                return true;
+        }
+    }
+    return false;
+#else
+  return false;
+#endif
+}
+
+void NativeThreadDarwin::ThreadDidStop() {
+// TODO implement this.
+#if 0
+    // This thread has existed prior to resuming under debug nub control, and
+    // has just been stopped. Do any cleanup that needs to be done after
+    // running.
+
+    // The thread state and breakpoint will still have the same values as they
+    // had prior to resuming the thread, so it makes it easy to check if we
+    // were trying to step a thread, or we tried to resume while being at a
+    // breakpoint.
+
+    // When this method gets called, the process state is still in the state it
+    // was in while running so we can act accordingly.
+    m_arch_up->ThreadDidStop();
+
+
+    // We may have suspended this thread so the primary thread could step
+    // without worrying about race conditions, so lets restore our suspend
+    // count.
+    RestoreSuspendCountAfterStop();
+
+    // Update the basic information for a thread
+    MachThread::GetBasicInfo(m_mach_port_number, &m_basic_info);
+
+    if (m_basic_info.suspend_count > 0)
+        SetState(eStateSuspended);
+    else
+        SetState(eStateStopped);
+#endif
+}
+
+bool NativeThreadDarwin::MachPortNumberIsValid(::thread_t thread) {
+  return thread != (::thread_t)(0);
+}
+
+const struct thread_basic_info *NativeThreadDarwin::GetBasicInfo() const {
+  if (GetBasicInfo(m_mach_thread_port, &m_basic_info))
+    return &m_basic_info;
+  return NULL;
+}
+
+bool NativeThreadDarwin::GetBasicInfo(::thread_t thread,
+                                      struct thread_basic_info *basicInfoPtr) {
+  if (MachPortNumberIsValid(thread)) {
+    unsigned int info_count = THREAD_BASIC_INFO_COUNT;
+    kern_return_t err = ::thread_info(thread, THREAD_BASIC_INFO,
+                                      (thread_info_t)basicInfoPtr, &info_count);
+    if (err == KERN_SUCCESS)
+      return true;
+  }
+  ::memset(basicInfoPtr, 0, sizeof(struct thread_basic_info));
+  return false;
+}
+
+bool NativeThreadDarwin::IsUserReady() const {
+  if (m_basic_info.run_state == 0)
+    GetBasicInfo();
+
+  switch (m_basic_info.run_state) {
+  default:
+  case TH_STATE_UNINTERRUPTIBLE:
+    break;
+
+  case TH_STATE_RUNNING:
+  case TH_STATE_STOPPED:
+  case TH_STATE_WAITING:
+  case TH_STATE_HALTED:
+    return true;
+  }
+  return false;
+}
+
+NativeProcessDarwinSP NativeThreadDarwin::GetNativeProcessDarwinSP() {
+  return std::static_pointer_cast<NativeProcessDarwin>(GetProcess());
+}
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.h
new file mode 100644
index 00000000000..616a9a7b9bf
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadDarwin.h
@@ -0,0 +1,165 @@
+//===-- NativeThreadDarwin.h ---------------------------------- -*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef NativeThreadDarwin_H
+#define NativeThreadDarwin_H
+
+// C includes
+#include <mach/mach_types.h>
+#include <sched.h>
+#include <sys/proc_info.h>
+
+// C++ includes
+#include <map>
+#include <memory>
+#include <string>
+
+// LLDB includes
+#include "lldb/Host/common/NativeThreadProtocol.h"
+#include "lldb/lldb-private-forward.h"
+
+#include "MachException.h"
+
+namespace lldb_private {
+namespace process_darwin {
+
+class NativeProcessDarwin;
+using NativeProcessDarwinSP = std::shared_ptr<NativeProcessDarwin>;
+
+class NativeThreadListDarwin;
+
+class NativeThreadDarwin : public NativeThreadProtocol {
+  friend class NativeProcessDarwin;
+  friend class NativeThreadListDarwin;
+
+public:
+  static uint64_t
+  GetGloballyUniqueThreadIDForMachPortID(::thread_t mach_port_id);
+
+  NativeThreadDarwin(NativeProcessDarwin *process, bool is_64_bit,
+                     lldb::tid_t unique_thread_id = 0,
+                     ::thread_t mach_thread_port = 0);
+
+  // NativeThreadProtocol Interface
+  std::string GetName() override;
+
+  lldb::StateType GetState() override;
+
+  bool GetStopReason(ThreadStopInfo &stop_info,
+                     std::string &description) override;
+
+  NativeRegisterContextSP GetRegisterContext() override;
+
+  Status SetWatchpoint(lldb::addr_t addr, size_t size, uint32_t watch_flags,
+                       bool hardware) override;
+
+  Status RemoveWatchpoint(lldb::addr_t addr) override;
+
+  // New methods that are fine for others to call.
+  void Dump(Stream &stream) const;
+
+private:
+  // Interface for friend classes
+
+  /// Resumes the thread.  If \p signo is anything but
+  /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
+  Status Resume(uint32_t signo);
+
+  /// Single steps the thread.  If \p signo is anything but
+  /// LLDB_INVALID_SIGNAL_NUMBER, deliver that signal to the thread.
+  Status SingleStep(uint32_t signo);
+
+  bool NotifyException(MachException::Data &exc);
+
+  bool ShouldStop(bool &step_more) const;
+
+  void ThreadDidStop();
+
+  void SetStoppedBySignal(uint32_t signo, const siginfo_t *info = nullptr);
+
+  /// Return true if the thread is stopped.
+  /// If stopped by a signal, indicate the signo in the signo
+  /// argument.  Otherwise, return LLDB_INVALID_SIGNAL_NUMBER.
+  bool IsStopped(int *signo);
+
+  const struct thread_basic_info *GetBasicInfo() const;
+
+  static bool GetBasicInfo(::thread_t thread,
+                           struct thread_basic_info *basicInfoPtr);
+
+  bool IsUserReady() const;
+
+  void SetStoppedByExec();
+
+  void SetStoppedByBreakpoint();
+
+  void SetStoppedByWatchpoint(uint32_t wp_index);
+
+  bool IsStoppedAtBreakpoint();
+
+  bool IsStoppedAtWatchpoint();
+
+  void SetStoppedByTrace();
+
+  void SetStoppedWithNoReason();
+
+  void SetExited();
+
+  Status RequestStop();
+
+  /// Return the mach thread port number for this thread.
+  ///
+  /// \return
+  ///     The mach port number for this thread.  Returns NULL_THREAD
+  ///     when the thread is invalid.
+  thread_t GetMachPortNumber() const { return m_mach_thread_port; }
+
+  static bool MachPortNumberIsValid(::thread_t thread);
+
+  // Private interface
+  bool GetIdentifierInfo();
+
+  void MaybeLogStateChange(lldb::StateType new_state);
+
+  NativeProcessDarwinSP GetNativeProcessDarwinSP();
+
+  void SetStopped();
+
+  inline void MaybePrepareSingleStepWorkaround();
+
+  inline void MaybeCleanupSingleStepWorkaround();
+
+  // Member Variables
+
+  // The mach thread port for the thread.
+  ::thread_t m_mach_thread_port;
+
+  // The most recently-retrieved thread basic info.
+  mutable ::thread_basic_info m_basic_info;
+
+  struct proc_threadinfo m_proc_threadinfo;
+
+  thread_identifier_info_data_t m_ident_info;
+
+#if 0
+    lldb::StateType m_state;
+    ThreadStopInfo m_stop_info;
+    NativeRegisterContextSP m_reg_context_sp;
+    std::string m_stop_description;
+    using WatchpointIndexMap = std::map<lldb::addr_t, uint32_t>;
+    WatchpointIndexMap m_watchpoint_index_map;
+    // cpu_set_t m_original_cpu_set; // For single-step workaround.
+#endif
+};
+
+typedef std::shared_ptr<NativeThreadDarwin> NativeThreadDarwinSP;
+
+} // namespace process_darwin
+} // namespace lldb_private
+
+#endif // #ifndef NativeThreadDarwin_H
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp
new file mode 100644
index 00000000000..1faa5b219cb
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp
@@ -0,0 +1,702 @@
+//===-- NativeThreadListDarwin.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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 6/19/07.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadListDarwin.h"
+
+// C includes
+#include <inttypes.h>
+#include <mach/vm_map.h>
+#include <sys/sysctl.h>
+
+// LLDB includes
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/Status.h"
+#include "lldb/Utility/Stream.h"
+#include "lldb/lldb-enumerations.h"
+
+#include "NativeProcessDarwin.h"
+#include "NativeThreadDarwin.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+
+NativeThreadListDarwin::NativeThreadListDarwin()
+    : m_threads(), m_threads_mutex(), m_is_64_bit(false) {}
+
+NativeThreadListDarwin::~NativeThreadListDarwin() {}
+
+// These methods will be accessed directly from NativeThreadDarwin
+#if 0
+nub_state_t
+NativeThreadListDarwin::GetState(nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetState();
+    return eStateInvalid;
+}
+
+const char *
+NativeThreadListDarwin::GetName (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetName();
+    return NULL;
+}
+#endif
+
+// TODO: figure out if we need to add this to NativeThreadDarwin yet.
+#if 0
+ThreadInfo::QoS
+NativeThreadListDarwin::GetRequestedQoS (nub_thread_t tid, nub_addr_t tsd, uint64_t dti_qos_class_index)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRequestedQoS(tsd, dti_qos_class_index);
+    return ThreadInfo::QoS();
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetPThreadT (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetPThreadT();
+    return INVALID_NUB_ADDRESS;
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetDispatchQueueT (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetDispatchQueueT();
+    return INVALID_NUB_ADDRESS;
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetTSDAddressForThread (nub_thread_t tid, uint64_t plo_pthread_tsd_base_address_offset, uint64_t plo_pthread_tsd_base_offset, uint64_t plo_pthread_tsd_entry_size)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetTSDAddressForThread(plo_pthread_tsd_base_address_offset, plo_pthread_tsd_base_offset, plo_pthread_tsd_entry_size);
+    return INVALID_NUB_ADDRESS;
+}
+#endif
+
+// TODO implement these
+#if 0
+nub_thread_t
+NativeThreadListDarwin::SetCurrentThread(nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+    {
+        m_current_thread = thread_sp;
+        return tid;
+    }
+    return INVALID_NUB_THREAD;
+}
+
+
+bool
+NativeThreadListDarwin::GetThreadStoppedReason(nub_thread_t tid, struct DNBThreadStopInfo *stop_info) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetStopException().GetStopInfo(stop_info);
+    return false;
+}
+
+bool
+NativeThreadListDarwin::GetIdentifierInfo (nub_thread_t tid, thread_identifier_info_data_t *ident_info)
+{
+    thread_t mach_port_number = GetMachPortNumberByThreadID (tid);
+
+    mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
+    return ::thread_info (mach_port_number, THREAD_IDENTIFIER_INFO, (thread_info_t)ident_info, &count) == KERN_SUCCESS;
+}
+
+void
+NativeThreadListDarwin::DumpThreadStoppedReason (nub_thread_t tid) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        thread_sp->GetStopException().DumpStopReason();
+}
+
+const char *
+NativeThreadListDarwin::GetThreadInfo (nub_thread_t tid) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetBasicInfoAsString();
+    return NULL;
+}
+
+#endif
+
+NativeThreadDarwinSP
+NativeThreadListDarwin::GetThreadByID(lldb::tid_t tid) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetID() == tid))
+      return thread_sp;
+  }
+  return NativeThreadDarwinSP();
+}
+
+NativeThreadDarwinSP NativeThreadListDarwin::GetThreadByMachPortNumber(
+    ::thread_t mach_port_number) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetMachPortNumber() == mach_port_number))
+      return thread_sp;
+  }
+  return NativeThreadDarwinSP();
+}
+
+lldb::tid_t NativeThreadListDarwin::GetThreadIDByMachPortNumber(
+    ::thread_t mach_port_number) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetMachPortNumber() == mach_port_number))
+      return thread_sp->GetID();
+  }
+  return LLDB_INVALID_THREAD_ID;
+}
+
+// TODO implement
+#if 0
+thread_t
+NativeThreadListDarwin::GetMachPortNumberByThreadID (nub_thread_t globally_unique_id) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    MachThreadSP thread_sp;
+    const size_t num_threads = m_threads.size();
+    for (size_t idx = 0; idx < num_threads; ++idx)
+    {
+        if (m_threads[idx]->ThreadID() == globally_unique_id)
+        {
+            return m_threads[idx]->MachPortNumber();
+        }
+    }
+    return 0;
+}
+
+bool
+NativeThreadListDarwin::GetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, DNBRegisterValue *reg_value ) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRegisterValue(set, reg, reg_value);
+
+    return false;
+}
+
+bool
+NativeThreadListDarwin::SetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, const DNBRegisterValue *reg_value ) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SetRegisterValue(set, reg, reg_value);
+
+    return false;
+}
+
+nub_size_t
+NativeThreadListDarwin::GetRegisterContext (nub_thread_t tid, void *buf, size_t buf_len)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRegisterContext (buf, buf_len);
+    return 0;
+}
+
+nub_size_t
+NativeThreadListDarwin::SetRegisterContext (nub_thread_t tid, const void *buf, size_t buf_len)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SetRegisterContext (buf, buf_len);
+    return 0;
+}
+
+uint32_t
+NativeThreadListDarwin::SaveRegisterState (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SaveRegisterState ();
+    return 0;
+}
+
+bool
+NativeThreadListDarwin::RestoreRegisterState (nub_thread_t tid, uint32_t save_id)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->RestoreRegisterState (save_id);
+    return 0;
+}
+#endif
+
+size_t NativeThreadListDarwin::GetNumberOfThreads() const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  return static_cast<size_t>(m_threads.size());
+}
+
+// TODO implement
+#if 0
+nub_thread_t
+NativeThreadListDarwin::ThreadIDAtIndex (nub_size_t idx) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    if (idx < m_threads.size())
+        return m_threads[idx]->ThreadID();
+    return INVALID_NUB_THREAD;
+}
+
+nub_thread_t
+NativeThreadListDarwin::CurrentThreadID ( )
+{
+    MachThreadSP thread_sp;
+    CurrentThread(thread_sp);
+    if (thread_sp.get())
+        return thread_sp->ThreadID();
+    return INVALID_NUB_THREAD;
+}
+
+#endif
+
+bool NativeThreadListDarwin::NotifyException(MachException::Data &exc) {
+  auto thread_sp = GetThreadByMachPortNumber(exc.thread_port);
+  if (thread_sp) {
+    thread_sp->NotifyException(exc);
+    return true;
+  }
+  return false;
+}
+
+void NativeThreadListDarwin::Clear() {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  m_threads.clear();
+}
+
+uint32_t NativeThreadListDarwin::UpdateThreadList(NativeProcessDarwin &process,
+                                                  bool update,
+                                                  collection *new_threads) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
+
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  LLDB_LOGF(log,
+            "NativeThreadListDarwin::%s() (pid = %" PRIu64 ", update = "
+            "%u) process stop count = %u",
+            __FUNCTION__, process.GetID(), update, process.GetStopID());
+
+  if (process.GetStopID() == 0) {
+    // On our first stop, we'll record details like 32/64 bitness and select
+    // the proper architecture implementation.
+    //
+    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, (int)process.GetID()};
+
+    struct kinfo_proc processInfo;
+    size_t bufsize = sizeof(processInfo);
+    if ((sysctl(mib, (unsigned)(sizeof(mib) / sizeof(int)), &processInfo,
+                &bufsize, NULL, 0) == 0) &&
+        (bufsize > 0)) {
+      if (processInfo.kp_proc.p_flag & P_LP64)
+        m_is_64_bit = true;
+    }
+
+// TODO implement architecture selection and abstraction.
+#if 0
+#if defined(__i386__) || defined(__x86_64__)
+        if (m_is_64_bit)
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_X86_64);
+        else
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_I386);
+#elif defined(__arm__) || defined(__arm64__) || defined(__aarch64__)
+        if (m_is_64_bit)
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_ARM64);
+        else
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_ARM);
+#endif
+#endif
+  }
+
+  if (m_threads.empty() || update) {
+    thread_array_t thread_list = nullptr;
+    mach_msg_type_number_t thread_list_count = 0;
+    task_t task = process.GetTask();
+
+    Status error;
+    auto mach_err = ::task_threads(task, &thread_list, &thread_list_count);
+    error.SetError(mach_err, eErrorTypeMachKernel);
+    if (error.Fail()) {
+      LLDB_LOGF(log,
+                "::task_threads(task = 0x%4.4x, thread_list => %p, "
+                "thread_list_count => %u) failed: %u (%s)",
+                task, thread_list, thread_list_count, error.GetError(),
+                error.AsCString());
+      return 0;
+    }
+
+    if (thread_list_count > 0) {
+      collection currThreads;
+      size_t idx;
+      // Iterator through the current thread list and see which threads we
+      // already have in our list (keep them), which ones we don't (add them),
+      // and which ones are not around anymore (remove them).
+      for (idx = 0; idx < thread_list_count; ++idx) {
+        // Get the Mach thread port.
+        const ::thread_t mach_port_num = thread_list[idx];
+
+        // Get the unique thread id for the mach port number.
+        uint64_t unique_thread_id =
+            NativeThreadDarwin::GetGloballyUniqueThreadIDForMachPortID(
+                mach_port_num);
+
+        // Retrieve the thread if it exists.
+        auto thread_sp = GetThreadByID(unique_thread_id);
+        if (thread_sp) {
+          // We are already tracking it. Keep the existing native thread
+          // instance.
+          currThreads.push_back(thread_sp);
+        } else {
+          // We don't have a native thread instance for this thread. Create it
+          // now.
+          thread_sp.reset(new NativeThreadDarwin(
+              &process, m_is_64_bit, unique_thread_id, mach_port_num));
+
+          // Add the new thread regardless of its is user ready state. Make
+          // sure the thread is ready to be displayed and shown to users before
+          // we add this thread to our list...
+          if (thread_sp->IsUserReady()) {
+            if (new_threads)
+              new_threads->push_back(thread_sp);
+
+            currThreads.push_back(thread_sp);
+          }
+        }
+      }
+
+      m_threads.swap(currThreads);
+      m_current_thread.reset();
+
+      // Free the vm memory given to us by ::task_threads()
+      vm_size_t thread_list_size =
+          (vm_size_t)(thread_list_count * sizeof(::thread_t));
+      ::vm_deallocate(::mach_task_self(), (vm_address_t)thread_list,
+                      thread_list_size);
+    }
+  }
+  return static_cast<uint32_t>(m_threads.size());
+}
+
+// TODO implement
+#if 0
+
+void
+NativeThreadListDarwin::CurrentThread (MachThreadSP& thread_sp)
+{
+    // locker will keep a mutex locked until it goes out of scope
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    if (m_current_thread.get() == NULL)
+    {
+        // Figure out which thread is going to be our current thread. This is
+        // currently done by finding the first thread in the list that has a
+        // valid exception.
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {
+            if (m_threads[idx]->GetStopException().IsValid())
+            {
+                m_current_thread = m_threads[idx];
+                break;
+            }
+        }
+    }
+    thread_sp = m_current_thread;
+}
+
+#endif
+
+void NativeThreadListDarwin::Dump(Stream &stream) const {
+  bool first = true;
+
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp) {
+      // Handle newlines between thread entries.
+      if (first)
+        first = false;
+      else
+        stream.PutChar('\n');
+      thread_sp->Dump(stream);
+    }
+  }
+}
+
+void NativeThreadListDarwin::ProcessWillResume(
+    NativeProcessDarwin &process, const ResumeActionList &thread_actions) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+
+  // Update our thread list, because sometimes libdispatch or the kernel will
+  // spawn threads while a task is suspended.
+  NativeThreadListDarwin::collection new_threads;
+
+// TODO implement this.
+#if 0
+    // First figure out if we were planning on running only one thread, and if
+    // so, force that thread to resume.
+    bool run_one_thread;
+    thread_t solo_thread = THREAD_NULL;
+    if ((thread_actions.GetSize() > 0) &&
+        (thread_actions.NumActionsWithState(eStateStepping) +
+         thread_actions.NumActionsWithState (eStateRunning) == 1))
+    {
+        run_one_thread = true;
+        const DNBThreadResumeAction *action_ptr = thread_actions.GetFirst();
+        size_t num_actions = thread_actions.GetSize();
+        for (size_t i = 0; i < num_actions; i++, action_ptr++)
+        {
+            if (action_ptr->state == eStateStepping || action_ptr->state == eStateRunning)
+            {
+                solo_thread = action_ptr->tid;
+                break;
+            }
+        }
+    }
+    else
+        run_one_thread = false;
+#endif
+
+  UpdateThreadList(process, true, &new_threads);
+
+#if 0
+    DNBThreadResumeAction resume_new_threads = { -1U, eStateRunning, 0, INVALID_NUB_ADDRESS };
+    // If we are planning to run only one thread, any new threads should be
+    // suspended.
+    if (run_one_thread)
+        resume_new_threads.state = eStateSuspended;
+
+    const size_t num_new_threads = new_threads.size();
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; idx < num_threads; ++idx)
+    {
+        MachThread *thread = m_threads[idx].get();
+        bool handled = false;
+        for (uint32_t new_idx = 0; new_idx < num_new_threads; ++new_idx)
+        {
+            if (thread == new_threads[new_idx].get())
+            {
+                thread->ThreadWillResume(&resume_new_threads);
+                handled = true;
+                break;
+            }
+        }
+
+        if (!handled)
+        {
+            const DNBThreadResumeAction *thread_action = thread_actions.GetActionForThread (thread->ThreadID(), true);
+            // There must always be a thread action for every thread.
+            assert (thread_action);
+            bool others_stopped = false;
+            if (solo_thread == thread->ThreadID())
+                others_stopped = true;
+            thread->ThreadWillResume (thread_action, others_stopped);
+        }
+    }
+    
+    if (new_threads.size())
+    {
+        for (uint32_t idx = 0; idx < num_new_threads; ++idx)
+        {
+            DNBLogThreadedIf (LOG_THREAD, "NativeThreadListDarwin::ProcessWillResume (pid = %4.4x) stop-id=%u, resuming newly discovered thread: 0x%8.8" PRIx64 ", thread-is-user-ready=%i)",
+                              process->ProcessID(), 
+                              process->StopCount(), 
+                              new_threads[idx]->ThreadID(),
+                              new_threads[idx]->IsUserReady());
+        }
+    }
+#endif
+}
+
+uint32_t NativeThreadListDarwin::ProcessDidStop(NativeProcessDarwin &process) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+
+  // Update our thread list.
+  UpdateThreadList(process, true);
+
+  for (auto thread_sp : m_threads) {
+    if (thread_sp)
+      thread_sp->ThreadDidStop();
+  }
+  return (uint32_t)m_threads.size();
+}
+
+// Check each thread in our thread list to see if we should notify our client
+// of the current halt in execution.
+//
+// Breakpoints can have callback functions associated with them than can return
+// true to stop, or false to continue executing the inferior.
+//
+// RETURNS
+//    true if we should stop and notify our clients
+//    false if we should resume our child process and skip notification
+bool NativeThreadListDarwin::ShouldStop(bool &step_more) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && thread_sp->ShouldStop(step_more))
+      return true;
+  }
+  return false;
+}
+
+// Implement.
+#if 0
+
+void
+NativeThreadListDarwin::NotifyBreakpointChanged (const DNBBreakpoint *bp)
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; idx < num_threads; ++idx)
+    {
+        m_threads[idx]->NotifyBreakpointChanged(bp);
+    }
+}
+
+
+uint32_t
+NativeThreadListDarwin::EnableHardwareBreakpoint (const DNBBreakpoint* bp) const
+{
+    if (bp != NULL)
+    {
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->EnableHardwareBreakpoint(bp);
+    }
+    return INVALID_NUB_HW_INDEX;
+}
+
+bool
+NativeThreadListDarwin::DisableHardwareBreakpoint (const DNBBreakpoint* bp) const
+{
+    if (bp != NULL)
+    {
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->DisableHardwareBreakpoint(bp);
+    }
+    return false;
+}
+
+// DNBWatchpointSet() -> MachProcess::CreateWatchpoint() ->
+// MachProcess::EnableWatchpoint() ->
+// NativeThreadListDarwin::EnableHardwareWatchpoint().
+uint32_t
+NativeThreadListDarwin::EnableHardwareWatchpoint (const DNBBreakpoint* wp) const
+{
+    uint32_t hw_index = INVALID_NUB_HW_INDEX;
+    if (wp != NULL)
+    {
+        PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+        const size_t num_threads = m_threads.size();
+        // On Mac OS X we have to prime the control registers for new threads.
+        // We do this using the control register data for the first thread, for
+        // lack of a better way of choosing.
+        bool also_set_on_task = true;
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {                
+            if ((hw_index = m_threads[idx]->EnableHardwareWatchpoint(wp, also_set_on_task)) == INVALID_NUB_HW_INDEX)
+            {
+                // We know that idx failed for some reason.  Let's rollback the
+                // transaction for [0, idx).
+                for (uint32_t i = 0; i < idx; ++i)
+                    m_threads[i]->RollbackTransForHWP();
+                return INVALID_NUB_HW_INDEX;
+            }
+            also_set_on_task = false;
+        }
+        // Notify each thread to commit the pending transaction.
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->FinishTransForHWP();
+
+    }
+    return hw_index;
+}
+
+bool
+NativeThreadListDarwin::DisableHardwareWatchpoint (const DNBBreakpoint* wp) const
+{
+    if (wp != NULL)
+    {
+        PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+        const size_t num_threads = m_threads.size();
+        
+        // On Mac OS X we have to prime the control registers for new threads.
+        // We do this using the control register data for the first thread, for
+        // lack of a better way of choosing.
+        bool also_set_on_task = true;
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {
+            if (!m_threads[idx]->DisableHardwareWatchpoint(wp, also_set_on_task))
+            {
+                // We know that idx failed for some reason.  Let's rollback the
+                // transaction for [0, idx).
+                for (uint32_t i = 0; i < idx; ++i)
+                    m_threads[i]->RollbackTransForHWP();
+                return false;
+            }
+            also_set_on_task = false;
+        }
+        // Notify each thread to commit the pending transaction.
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->FinishTransForHWP();
+
+        return true;
+    }
+    return false;
+}
+
+uint32_t
+NativeThreadListDarwin::NumSupportedHardwareWatchpoints () const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    const size_t num_threads = m_threads.size();
+    // Use an arbitrary thread to retrieve the number of supported hardware
+    // watchpoints.
+    if (num_threads)
+        return m_threads[0]->NumSupportedHardwareWatchpoints();
+    return 0;
+}
+
+uint32_t
+NativeThreadListDarwin::GetThreadIndexForThreadStoppedWithSignal (const int signo) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    uint32_t should_stop = false;
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; !should_stop && idx < num_threads; ++idx)
+    {
+        if (m_threads[idx]->GetStopException().SoftSignal () == signo)
+            return idx;
+    }
+    return UINT32_MAX;
+}
+
+#endif
diff --git a/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.h b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.h
new file mode 100644
index 00000000000..9ab0a7c8c80
--- /dev/null
+++ b/gnu/llvm/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.h
@@ -0,0 +1,138 @@
+//===-- NativeThreadListDarwin.h --------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 6/19/07.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __NativeThreadListDarwin_h__
+#define __NativeThreadListDarwin_h__
+
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include "lldb/lldb-private-forward.h"
+#include "lldb/lldb-types.h"
+
+#include "MachException.h"
+
+// #include "ThreadInfo.h"
+
+namespace lldb_private {
+namespace process_darwin {
+
+class NativeBreakpointDarwin;
+class NativeProcessDarwin;
+
+class NativeThreadDarwin;
+using NativeThreadDarwinSP = std::shared_ptr<NativeThreadDarwin>;
+
+class NativeThreadListDarwin {
+public:
+  NativeThreadListDarwin();
+  ~NativeThreadListDarwin();
+
+  void Clear();
+
+  void Dump(Stream &stream) const;
+
+// These methods will be accessed directly from NativeThreadDarwin
+#if 0
+    bool            GetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, DNBRegisterValue *reg_value) const;
+    bool            SetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, const DNBRegisterValue *reg_value) const;
+    nub_size_t      GetRegisterContext (nub_thread_t tid, void *buf, size_t buf_len);
+    nub_size_t      SetRegisterContext (nub_thread_t tid, const void *buf, size_t buf_len);
+    uint32_t        SaveRegisterState (nub_thread_t tid);
+    bool            RestoreRegisterState (nub_thread_t tid, uint32_t save_id);
+#endif
+
+  const char *GetThreadInfo(lldb::tid_t tid) const;
+
+  void ProcessWillResume(NativeProcessDarwin &process,
+                         const ResumeActionList &thread_actions);
+
+  uint32_t ProcessDidStop(NativeProcessDarwin &process);
+
+  bool NotifyException(MachException::Data &exc);
+
+  bool ShouldStop(bool &step_more);
+
+// These methods will be accessed directly from NativeThreadDarwin
+#if 0
+    const char *    GetName (nub_thread_t tid);
+    nub_state_t     GetState (nub_thread_t tid);
+    nub_thread_t    SetCurrentThread (nub_thread_t tid);
+#endif
+
+// TODO: figure out if we need to add this to NativeThreadDarwin yet.
+#if 0
+    ThreadInfo::QoS GetRequestedQoS (nub_thread_t tid, nub_addr_t tsd, uint64_t dti_qos_class_index);
+    nub_addr_t      GetPThreadT (nub_thread_t tid);
+    nub_addr_t      GetDispatchQueueT (nub_thread_t tid);
+    nub_addr_t      GetTSDAddressForThread (nub_thread_t tid, uint64_t plo_pthread_tsd_base_address_offset, uint64_t plo_pthread_tsd_base_offset, uint64_t plo_pthread_tsd_entry_size);
+#endif
+
+// These methods will be accessed directly from NativeThreadDarwin
+#if 0
+    bool            GetThreadStoppedReason (nub_thread_t tid, struct DNBThreadStopInfo *stop_info) const;
+    void            DumpThreadStoppedReason (nub_thread_t tid) const;
+    bool            GetIdentifierInfo (nub_thread_t tid, thread_identifier_info_data_t *ident_info);
+#endif
+
+  size_t GetNumberOfThreads() const;
+
+  lldb::tid_t ThreadIDAtIndex(size_t idx) const;
+
+  lldb::tid_t GetCurrentThreadID();
+
+  NativeThreadDarwinSP GetCurrentThread();
+
+  void NotifyBreakpointChanged(const NativeBreakpointDarwin *bp);
+
+  uint32_t EnableHardwareBreakpoint(const NativeBreakpointDarwin *bp) const;
+
+  bool DisableHardwareBreakpoint(const NativeBreakpointDarwin *bp) const;
+
+  uint32_t EnableHardwareWatchpoint(const NativeBreakpointDarwin *wp) const;
+
+  bool DisableHardwareWatchpoint(const NativeBreakpointDarwin *wp) const;
+
+  uint32_t GetNumberOfSupportedHardwareWatchpoints() const;
+
+  size_t GetThreadIndexForThreadStoppedWithSignal(const int signo) const;
+
+  NativeThreadDarwinSP GetThreadByID(lldb::tid_t tid) const;
+
+  NativeThreadDarwinSP
+  GetThreadByMachPortNumber(::thread_t mach_port_number) const;
+
+  lldb::tid_t GetThreadIDByMachPortNumber(::thread_t mach_port_number) const;
+
+  thread_t GetMachPortNumberByThreadID(lldb::tid_t globally_unique_id) const;
+
+protected:
+  typedef std::vector<NativeThreadDarwinSP> collection;
+  typedef collection::iterator iterator;
+  typedef collection::const_iterator const_iterator;
+
+  // Consider having this return an lldb_private::Status.
+  uint32_t UpdateThreadList(NativeProcessDarwin &process, bool update,
+                            collection *num_threads = nullptr);
+
+  collection m_threads;
+  mutable std::recursive_mutex m_threads_mutex;
+  NativeThreadDarwinSP m_current_thread;
+  bool m_is_64_bit;
+};
+
+} // namespace process_darwin
+} // namespace lldb_private
+
+#endif // #ifndef __NativeThreadListDarwin_h__