Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release:

MFC r309142 (by emaste):

Add WITH_LLD_AS_LD build knob

If set it installs LLD as /usr/bin/ld.  LLD (as of version 3.9) is not
capable of linking the world and kernel, but can self-host and link many
substantial applications. GNU ld continues to be used for the world and
kernel build, regardless of how this knob is set.

It is on by default for arm64, and off for all other CPU architectures.

Sponsored by:	The FreeBSD Foundation

MFC r310840:

Reapply 310775, now it also builds correctly if lldb is disabled:

Move llvm-objdump from CLANG_EXTRAS to installed by default

We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879

MFC r312855 (by emaste):

Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC

Reported by:	Dan McGregor <dan.mcgregor usask.ca>

MFC r313559 | glebius | 2017-02-10 18:34:48 +0100 (Fri, 10 Feb 2017) | 5 lines

Don't check struct rtentry on FreeBSD, it is an internal kernel structure.
On other systems it may be API structure for SIOCADDRT/SIOCDELRT.

Reviewed by:	emaste, dim

MFC r314152 (by jkim):

Remove an assembler flag, which is redundant since r309124.  The upstream
took care of it by introducing a macro NO_EXEC_STACK_DIRECTIVE.

http://llvm.org/viewvc/llvm-project?rev=273500&view=rev

Reviewed by:	dim

MFC r314564:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509).  The release will follow soon.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64.  See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes:	yes
Exp-run:	antoine
PR:		215969, 216008

MFC r314708:

For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

This commit is the cause of excessive compile times on skein_block.c
(and possibly other files) during kernel builds on amd64.

We never saw the problematic behavior described in this upstream commit,
so for now it is better to revert it.  An upstream bug has been filed
here: https://bugs.llvm.org/show_bug.cgi?id=32142

Reported by:	mjg

MFC r314795:

Reapply r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

Pull in r296992 from upstream llvm trunk (by Sanjoy Das):

  [SCEV] Decrease the recursion threshold for CompareValueComplexity

  Fixes PR32142.

  r287232 accidentally increased the recursion threshold for
  CompareValueComplexity from 2 to 32.  This change reverses that
  change by introducing a separate flag for CompareValueComplexity's
  threshold.

The latter revision fixes the excessive compile times for skein_block.c.

MFC r314907 | mmel | 2017-03-08 12:40:27 +0100 (Wed, 08 Mar 2017) | 7 lines

Unbreak ARMv6 world.

The new compiler_rt library imported with clang 4.0.0 have several fatal
issues (non-functional __udivsi3 for example) with ARM specific instrict
functions. As temporary workaround, until upstream solve these problems,
disable all thumb[1][2] related feature.

MFC r315016:

Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release.
We were already very close to the last release candidate, so this is a
pretty minor update.

Relnotes:	yes

MFC r316005:

Revert r314907, and pull in r298713 from upstream compiler-rt trunk (by
Weiming Zhao):

  builtins: Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA.

  Summary:
  Value of __ARM_ARCH_ISA_THUMB isn't based on the actual compilation
  mode (-mthumb, -marm), it reflect's capability of given CPU.

  Due to this:
   - use  __tbumb__ and __thumb2__ insteand of __ARM_ARCH_ISA_THUMB
   - use '.thumb' directive consistently  in all affected files
   - decorate all thumb functions using
     DEFINE_COMPILERRT_THUMB_FUNCTION()

  ---------
  Note: This patch doesn't fix broken Thumb1 variant of __udivsi3 !

  Reviewers: weimingz, rengolin, compnerd

  Subscribers: aemerson, dim

  Differential Revision: https://reviews.llvm.org/D30938

Discussed with:	mmel

1 files changed, 653 insertions, 0 deletions

diff --git a/contrib/llvm/tools/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp b/contrib/llvm/tools/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp
new file mode 100644
index 0000000..63b1ae6
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Plugins/Process/Darwin/DarwinProcessLauncher.cpp
@@ -0,0 +1,653 @@
+//===-- DarwinProcessLauncher.cpp -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+//
+//  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/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/StreamString.h"
+#include "lldb/Target/ProcessLaunchInfo.h"
+#include "lldb/Utility/PseudoTerminal.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 Error ForkChildForPTraceDebugging(const char *path, char const *argv[],
+                                         char const *envp[], ::pid_t *pid,
+                                         int *pty_fd) {
+  Error 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.
+  lldb_utility::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) {
+    //--------------------------------------------------------------
+    // Error 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 Error
+CreatePosixSpawnFileAction(const FileAction &action,
+                           posix_spawn_file_actions_t *file_actions) {
+  Error 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:
+    if (log)
+      log->Printf("%s(): unsupported file action %u", __FUNCTION__,
+                  action.GetAction());
+    break;
+  }
+
+  return error;
+}
+
+static Error PosixSpawnChildForPTraceDebugging(const char *path,
+                                               ProcessLaunchInfo &launch_info,
+                                               ::pid_t *pid,
+                                               cpu_type_t *actual_cpu_type) {
+  Error 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) {
+    if (log)
+      log->Printf("::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) {
+    if (log)
+      log->Printf("::posix_spawnattr_setflags(&attr, "
+                  "POSIX_SPAWN_START_SUSPENDED%s) failed: %s",
+                  flags & _POSIX_SPAWN_DISABLE_ASLR
+                      ? " | _POSIX_SPAWN_DISABLE_ASLR"
+                      : "",
+                  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) {
+      if (log)
+        log->Printf("::posix_spawnattr_setbinpref_np(&attr, 1, "
+                    "cpu_type = 0x%8.8x, count => %llu): %s",
+                    desired_cpu_type, (uint64_t)ocount, 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) {
+    if (log)
+      log->Printf("::posix_spawn_file_actions_init(&file_actions) "
+                  "failed: %s",
+                  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()) {
+      if (log)
+        log->Printf("%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) {
+    if (log)
+      log->Printf("::posix_spawnp(pid => %p, path = '%s', file_actions "
+                  "= %p, attr = %p, argv = %p, envp = %p) failed: %s",
+                  pid, path, &file_actions, &attr, argv, envp,
+                  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);
+    if (log)
+      log->Printf("%s(): cpu type for launched process pid=%i: "
+                  "cpu_type=0x%8.8x",
+                  __FUNCTION__, *pid, *actual_cpu_type);
+  }
+
+  return error;
+}
+
+Error LaunchInferior(ProcessLaunchInfo &launch_info, int *pty_master_fd,
+                     LaunchFlavor *launch_flavor) {
+  Error 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';
+
+  if (log)
+    log->Printf("%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))) {
+    if (log)
+      log->Printf("%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 {
+    if (log)
+      log->Printf("%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