vendor/lldb/lldb-trunk-r256945

1 files changed, 1705 insertions, 0 deletions

diff --git a/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp b/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
new file mode 100644
index 000000000000..fb38630710a1
--- /dev/null
+++ b/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
@@ -0,0 +1,1705 @@
+//===-- PlatformDarwin.cpp --------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PlatformDarwin.h"
+
+// C Includes
+#include <string.h>
+
+// C++ Includes
+#include <algorithm>
+#include <mutex>
+
+// Other libraries and framework includes
+#include "clang/Basic/VersionTuple.h"
+// Project includes
+#include "lldb/Breakpoint/BreakpointLocation.h"
+#include "lldb/Breakpoint/BreakpointSite.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Core/Timer.h"
+#include "lldb/Host/Host.h"
+#include "lldb/Host/HostInfo.h"
+#include "lldb/Host/FileSystem.h"
+#include "lldb/Host/Symbols.h"
+#include "lldb/Host/StringConvert.h"
+#include "lldb/Host/XML.h"
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/SymbolFile.h"
+#include "lldb/Symbol/SymbolVendor.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+#include "llvm/ADT/STLExtras.h"
+
+#if defined (__APPLE__)
+#include <TargetConditionals.h> // for TARGET_OS_TV, TARGET_OS_WATCH
+#endif
+
+using namespace lldb;
+using namespace lldb_private;
+    
+
+//------------------------------------------------------------------
+/// Default Constructor
+//------------------------------------------------------------------
+PlatformDarwin::PlatformDarwin (bool is_host) :
+    PlatformPOSIX(is_host),  // This is the local host platform
+    m_developer_directory ()
+{
+}
+
+//------------------------------------------------------------------
+/// Destructor.
+///
+/// The destructor is virtual since this class is designed to be
+/// inherited from by the plug-in instance.
+//------------------------------------------------------------------
+PlatformDarwin::~PlatformDarwin()
+{
+}
+
+FileSpecList
+PlatformDarwin::LocateExecutableScriptingResources (Target *target,
+                                                    Module &module,
+                                                    Stream* feedback_stream)
+{
+    FileSpecList file_list;
+    if (target && target->GetDebugger().GetScriptLanguage() == eScriptLanguagePython)
+    {
+        // NB some extensions might be meaningful and should not be stripped - "this.binary.file"
+        // should not lose ".file" but GetFileNameStrippingExtension() will do precisely that.
+        // Ideally, we should have a per-platform list of extensions (".exe", ".app", ".dSYM", ".framework")
+        // which should be stripped while leaving "this.binary.file" as-is.
+        ScriptInterpreter *script_interpreter = target->GetDebugger().GetCommandInterpreter().GetScriptInterpreter();
+        
+        FileSpec module_spec = module.GetFileSpec();
+        
+        if (module_spec)
+        {
+            SymbolVendor *symbols = module.GetSymbolVendor ();
+            if (symbols)
+            {
+                SymbolFile *symfile = symbols->GetSymbolFile();
+                if (symfile)
+                {
+                    ObjectFile *objfile = symfile->GetObjectFile();
+                    if (objfile)
+                    {
+                        FileSpec symfile_spec (objfile->GetFileSpec());
+                        if (symfile_spec && symfile_spec.Exists())
+                        {
+                            while (module_spec.GetFilename())
+                            {
+                                std::string module_basename (module_spec.GetFilename().GetCString());
+                                std::string original_module_basename (module_basename);
+                                
+                                bool was_keyword = false;
+
+                                // FIXME: for Python, we cannot allow certain characters in module
+                                // filenames we import. Theoretically, different scripting languages may
+                                // have different sets of forbidden tokens in filenames, and that should
+                                // be dealt with by each ScriptInterpreter. For now, we just replace dots
+                                // with underscores, but if we ever support anything other than Python
+                                // we will need to rework this
+                                std::replace(module_basename.begin(), module_basename.end(), '.', '_');
+                                std::replace(module_basename.begin(), module_basename.end(), ' ', '_');
+                                std::replace(module_basename.begin(), module_basename.end(), '-', '_');
+                                if (script_interpreter && script_interpreter->IsReservedWord(module_basename.c_str()))
+                                {
+                                    module_basename.insert(module_basename.begin(), '_');
+                                    was_keyword = true;
+                                }
+
+                                StreamString path_string;
+                                StreamString original_path_string;
+                                // for OSX we are going to be in .dSYM/Contents/Resources/DWARF/<basename>
+                                // let us go to .dSYM/Contents/Resources/Python/<basename>.py and see if the file exists
+                                path_string.Printf("%s/../Python/%s.py",symfile_spec.GetDirectory().GetCString(), module_basename.c_str());
+                                original_path_string.Printf("%s/../Python/%s.py",symfile_spec.GetDirectory().GetCString(), original_module_basename.c_str());
+                                FileSpec script_fspec(path_string.GetData(), true);
+                                FileSpec orig_script_fspec(original_path_string.GetData(), true);
+                                
+                                // if we did some replacements of reserved characters, and a file with the untampered name
+                                // exists, then warn the user that the file as-is shall not be loaded
+                                if (feedback_stream)
+                                {
+                                    if (module_basename != original_module_basename
+                                        && orig_script_fspec.Exists())
+                                    {
+                                        const char* reason_for_complaint = was_keyword ? "conflicts with a keyword" : "contains reserved characters";
+                                        if (script_fspec.Exists())
+                                            feedback_stream->Printf("warning: the symbol file '%s' contains a debug script. However, its name"
+                                                                    " '%s' %s and as such cannot be loaded. LLDB will"
+                                                                    " load '%s' instead. Consider removing the file with the malformed name to"
+                                                                    " eliminate this warning.\n",
+                                                                    symfile_spec.GetPath().c_str(),
+                                                                    original_path_string.GetData(),
+                                                                    reason_for_complaint,
+                                                                    path_string.GetData());
+                                        else
+                                            feedback_stream->Printf("warning: the symbol file '%s' contains a debug script. However, its name"
+                                                                    " %s and as such cannot be loaded. If you intend"
+                                                                    " to have this script loaded, please rename '%s' to '%s' and retry.\n",
+                                                                    symfile_spec.GetPath().c_str(),
+                                                                    reason_for_complaint,
+                                                                    original_path_string.GetData(),
+                                                                    path_string.GetData());
+                                    }
+                                }
+                                
+                                if (script_fspec.Exists())
+                                {
+                                    file_list.Append (script_fspec);
+                                    break;
+                                }
+                                
+                                // If we didn't find the python file, then keep
+                                // stripping the extensions and try again
+                                ConstString filename_no_extension (module_spec.GetFileNameStrippingExtension());
+                                if (module_spec.GetFilename() == filename_no_extension)
+                                    break;
+                                
+                                module_spec.GetFilename() = filename_no_extension;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return file_list;
+}
+
+Error
+PlatformDarwin::ResolveExecutable (const ModuleSpec &module_spec,
+                                   lldb::ModuleSP &exe_module_sp,
+                                   const FileSpecList *module_search_paths_ptr)
+{
+    Error error;
+    // Nothing special to do here, just use the actual file and architecture
+
+    char exe_path[PATH_MAX];
+    ModuleSpec resolved_module_spec(module_spec);
+
+    if (IsHost())
+    {
+        // If we have "ls" as the exe_file, resolve the executable loation based on
+        // the current path variables
+        if (!resolved_module_spec.GetFileSpec().Exists())
+        {
+            module_spec.GetFileSpec().GetPath (exe_path, sizeof(exe_path));
+            resolved_module_spec.GetFileSpec().SetFile(exe_path, true);
+        }
+
+        if (!resolved_module_spec.GetFileSpec().Exists())
+            resolved_module_spec.GetFileSpec().ResolveExecutableLocation ();
+
+        // Resolve any executable within a bundle on MacOSX
+        Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
+        
+        if (resolved_module_spec.GetFileSpec().Exists())
+            error.Clear();
+        else
+        {
+            const uint32_t permissions = resolved_module_spec.GetFileSpec().GetPermissions();
+            if (permissions && (permissions & eFilePermissionsEveryoneR) == 0)
+                error.SetErrorStringWithFormat ("executable '%s' is not readable", resolved_module_spec.GetFileSpec().GetPath().c_str());
+            else
+                error.SetErrorStringWithFormat ("unable to find executable for '%s'", resolved_module_spec.GetFileSpec().GetPath().c_str());
+        }
+    }
+    else
+    {
+        if (m_remote_platform_sp)
+        {
+            error = GetCachedExecutable (resolved_module_spec, exe_module_sp, module_search_paths_ptr, *m_remote_platform_sp);
+        }
+        else
+        {
+            // We may connect to a process and use the provided executable (Don't use local $PATH).
+
+            // Resolve any executable within a bundle on MacOSX
+            Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
+
+            if (resolved_module_spec.GetFileSpec().Exists())
+                error.Clear();
+            else
+                error.SetErrorStringWithFormat("the platform is not currently connected, and '%s' doesn't exist in the system root.", resolved_module_spec.GetFileSpec().GetFilename().AsCString(""));
+        }
+    }
+    
+
+    if (error.Success())
+    {
+        if (resolved_module_spec.GetArchitecture().IsValid())
+        {
+            error = ModuleList::GetSharedModule (resolved_module_spec,
+                                                 exe_module_sp,
+                                                 module_search_paths_ptr,
+                                                 NULL,
+                                                 NULL);
+
+            if (error.Fail() || exe_module_sp.get() == NULL || exe_module_sp->GetObjectFile() == NULL)
+            {
+                exe_module_sp.reset();
+                error.SetErrorStringWithFormat ("'%s' doesn't contain the architecture %s",
+                                                resolved_module_spec.GetFileSpec().GetPath().c_str(),
+                                                resolved_module_spec.GetArchitecture().GetArchitectureName());
+            }
+        }
+        else
+        {
+            // No valid architecture was specified, ask the platform for
+            // the architectures that we should be using (in the correct order)
+            // and see if we can find a match that way
+            StreamString arch_names;
+            for (uint32_t idx = 0; GetSupportedArchitectureAtIndex (idx, resolved_module_spec.GetArchitecture()); ++idx)
+            {
+                error = GetSharedModule (resolved_module_spec,
+                                         NULL,
+                                         exe_module_sp,
+                                         module_search_paths_ptr,
+                                         NULL,
+                                         NULL);
+                // Did we find an executable using one of the
+                if (error.Success())
+                {
+                    if (exe_module_sp && exe_module_sp->GetObjectFile())
+                        break;
+                    else
+                        error.SetErrorToGenericError();
+                }
+                
+                if (idx > 0)
+                    arch_names.PutCString (", ");
+                arch_names.PutCString (resolved_module_spec.GetArchitecture().GetArchitectureName());
+            }
+            
+            if (error.Fail() || !exe_module_sp)
+            {
+                if (resolved_module_spec.GetFileSpec().Readable())
+                {
+                    error.SetErrorStringWithFormat ("'%s' doesn't contain any '%s' platform architectures: %s",
+                                                    resolved_module_spec.GetFileSpec().GetPath().c_str(),
+                                                    GetPluginName().GetCString(),
+                                                    arch_names.GetString().c_str());
+                }
+                else
+                {
+                    error.SetErrorStringWithFormat("'%s' is not readable", resolved_module_spec.GetFileSpec().GetPath().c_str());
+                }
+            }
+        }
+    }
+
+    return error;
+}
+
+Error
+PlatformDarwin::ResolveSymbolFile (Target &target,
+                                   const ModuleSpec &sym_spec,
+                                   FileSpec &sym_file)
+{
+    Error error;
+    sym_file = sym_spec.GetSymbolFileSpec();
+    if (sym_file.Exists())
+    {
+        if (sym_file.GetFileType() == FileSpec::eFileTypeDirectory)
+        {
+            sym_file = Symbols::FindSymbolFileInBundle (sym_file,
+                                                        sym_spec.GetUUIDPtr(),
+                                                        sym_spec.GetArchitecturePtr());
+        }
+    }
+    else
+    {
+        if (sym_spec.GetUUID().IsValid())
+        {
+            
+        }
+    }
+    return error;
+    
+}
+
+static lldb_private::Error
+MakeCacheFolderForFile (const FileSpec& module_cache_spec)
+{
+    FileSpec module_cache_folder = module_cache_spec.CopyByRemovingLastPathComponent();
+    return FileSystem::MakeDirectory(module_cache_folder, eFilePermissionsDirectoryDefault);
+}
+
+static lldb_private::Error
+BringInRemoteFile (Platform* platform,
+                   const lldb_private::ModuleSpec &module_spec,
+                   const FileSpec& module_cache_spec)
+{
+    MakeCacheFolderForFile(module_cache_spec);
+    Error err = platform->GetFile(module_spec.GetFileSpec(), module_cache_spec);
+    return err;
+}
+
+lldb_private::Error
+PlatformDarwin::GetSharedModuleWithLocalCache (const lldb_private::ModuleSpec &module_spec,
+                                               lldb::ModuleSP &module_sp,
+                                               const lldb_private::FileSpecList *module_search_paths_ptr,
+                                               lldb::ModuleSP *old_module_sp_ptr,
+                                               bool *did_create_ptr)
+{
+
+    Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM));
+    if (log)
+        log->Printf("[%s] Trying to find module %s/%s - platform path %s/%s symbol path %s/%s",
+                     (IsHost() ? "host" : "remote"),
+                     module_spec.GetFileSpec().GetDirectory().AsCString(),
+                     module_spec.GetFileSpec().GetFilename().AsCString(),
+                     module_spec.GetPlatformFileSpec().GetDirectory().AsCString(),
+                     module_spec.GetPlatformFileSpec().GetFilename().AsCString(),
+                     module_spec.GetSymbolFileSpec().GetDirectory().AsCString(),
+                     module_spec.GetSymbolFileSpec().GetFilename().AsCString());
+    
+    Error err;
+    
+    err = ModuleList::GetSharedModule(module_spec, module_sp, module_search_paths_ptr, old_module_sp_ptr, did_create_ptr);
+    if (module_sp)
+        return err;
+    
+    if (!IsHost())
+    {
+        std::string cache_path(GetLocalCacheDirectory());
+        // Only search for a locally cached file if we have a valid cache path
+        if (!cache_path.empty())
+        {
+            std::string module_path (module_spec.GetFileSpec().GetPath());
+            cache_path.append(module_path);
+            FileSpec module_cache_spec(cache_path.c_str(),false);
+        
+            // if rsync is supported, always bring in the file - rsync will be very efficient
+            // when files are the same on the local and remote end of the connection
+            if (this->GetSupportsRSync())
+            {
+                err = BringInRemoteFile (this, module_spec, module_cache_spec);
+                if (err.Fail())
+                    return err;
+                if (module_cache_spec.Exists())
+                {
+                    Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM));
+                    if (log)
+                        log->Printf("[%s] module %s/%s was rsynced and is now there",
+                                     (IsHost() ? "host" : "remote"),
+                                     module_spec.GetFileSpec().GetDirectory().AsCString(),
+                                     module_spec.GetFileSpec().GetFilename().AsCString());
+                    ModuleSpec local_spec(module_cache_spec, module_spec.GetArchitecture());
+                    module_sp.reset(new Module(local_spec));
+                    module_sp->SetPlatformFileSpec(module_spec.GetFileSpec());
+                    return Error();
+                }
+            }
+            
+            // try to find the module in the cache
+            if (module_cache_spec.Exists())
+            {
+                // get the local and remote MD5 and compare
+                if (m_remote_platform_sp)
+                {
+                    // when going over the *slow* GDB remote transfer mechanism we first check
+                    // the hashes of the files - and only do the actual transfer if they differ
+                    uint64_t high_local,high_remote,low_local,low_remote;
+                    FileSystem::CalculateMD5(module_cache_spec, low_local, high_local);
+                    m_remote_platform_sp->CalculateMD5(module_spec.GetFileSpec(), low_remote, high_remote);
+                    if (low_local != low_remote || high_local != high_remote)
+                    {
+                        // bring in the remote file
+                        Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM));
+                        if (log)
+                            log->Printf("[%s] module %s/%s needs to be replaced from remote copy",
+                                         (IsHost() ? "host" : "remote"),
+                                         module_spec.GetFileSpec().GetDirectory().AsCString(),
+                                         module_spec.GetFileSpec().GetFilename().AsCString());
+                        Error err = BringInRemoteFile (this, module_spec, module_cache_spec);
+                        if (err.Fail())
+                            return err;
+                    }
+                }
+                
+                ModuleSpec local_spec(module_cache_spec, module_spec.GetArchitecture());
+                module_sp.reset(new Module(local_spec));
+                module_sp->SetPlatformFileSpec(module_spec.GetFileSpec());
+                Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM));
+                    if (log)
+                        log->Printf("[%s] module %s/%s was found in the cache",
+                                     (IsHost() ? "host" : "remote"),
+                                     module_spec.GetFileSpec().GetDirectory().AsCString(),
+                                     module_spec.GetFileSpec().GetFilename().AsCString());
+                return Error();
+            }
+            
+            // bring in the remote module file
+            if (log)
+                log->Printf("[%s] module %s/%s needs to come in remotely",
+                             (IsHost() ? "host" : "remote"),
+                             module_spec.GetFileSpec().GetDirectory().AsCString(),
+                             module_spec.GetFileSpec().GetFilename().AsCString());
+            Error err = BringInRemoteFile (this, module_spec, module_cache_spec);
+            if (err.Fail())
+                return err;
+            if (module_cache_spec.Exists())
+            {
+                Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM));
+                if (log)
+                    log->Printf("[%s] module %s/%s is now cached and fine",
+                                 (IsHost() ? "host" : "remote"),
+                                 module_spec.GetFileSpec().GetDirectory().AsCString(),
+                                 module_spec.GetFileSpec().GetFilename().AsCString());
+                ModuleSpec local_spec(module_cache_spec, module_spec.GetArchitecture());
+                module_sp.reset(new Module(local_spec));
+                module_sp->SetPlatformFileSpec(module_spec.GetFileSpec());
+                return Error();
+            }
+            else
+                return Error("unable to obtain valid module file");
+        }
+        else
+            return Error("no cache path");
+    }
+    else
+        return Error ("unable to resolve module");
+}
+
+Error
+PlatformDarwin::GetSharedModule (const ModuleSpec &module_spec,
+                                 Process* process,
+                                 ModuleSP &module_sp,
+                                 const FileSpecList *module_search_paths_ptr,
+                                 ModuleSP *old_module_sp_ptr,
+                                 bool *did_create_ptr)
+{
+    Error error;
+    module_sp.reset();
+    
+    if (IsRemote())
+    {
+        // If we have a remote platform always, let it try and locate
+        // the shared module first.
+        if (m_remote_platform_sp)
+        {
+            error = m_remote_platform_sp->GetSharedModule (module_spec,
+                                                           process,
+                                                           module_sp,
+                                                           module_search_paths_ptr,
+                                                           old_module_sp_ptr,
+                                                           did_create_ptr);
+        }
+    }
+    
+    if (!module_sp)
+    {
+        // Fall back to the local platform and find the file locally
+        error = Platform::GetSharedModule (module_spec,
+                                           process,
+                                           module_sp,
+                                           module_search_paths_ptr,
+                                           old_module_sp_ptr,
+                                           did_create_ptr);
+        
+        const FileSpec &platform_file = module_spec.GetFileSpec();
+        if (!module_sp && module_search_paths_ptr && platform_file)
+        {
+            // We can try to pull off part of the file path up to the bundle
+            // directory level and try any module search paths...
+            FileSpec bundle_directory;
+            if (Host::GetBundleDirectory (platform_file, bundle_directory))
+            {
+                if (platform_file == bundle_directory)
+                {
+                    ModuleSpec new_module_spec (module_spec);
+                    new_module_spec.GetFileSpec() = bundle_directory;
+                    if (Host::ResolveExecutableInBundle (new_module_spec.GetFileSpec()))
+                    {
+                        Error new_error (Platform::GetSharedModule (new_module_spec,
+                                                                    process,
+                                                                    module_sp,
+                                                                    NULL,
+                                                                    old_module_sp_ptr,
+                                                                    did_create_ptr));
+                        
+                        if (module_sp)
+                            return new_error;
+                    }
+                }
+                else
+                {
+                    char platform_path[PATH_MAX];
+                    char bundle_dir[PATH_MAX];
+                    platform_file.GetPath (platform_path, sizeof(platform_path));
+                    const size_t bundle_directory_len = bundle_directory.GetPath (bundle_dir, sizeof(bundle_dir));
+                    char new_path[PATH_MAX];
+                    size_t num_module_search_paths = module_search_paths_ptr->GetSize();
+                    for (size_t i=0; i<num_module_search_paths; ++i)
+                    {
+                        const size_t search_path_len = module_search_paths_ptr->GetFileSpecAtIndex(i).GetPath(new_path, sizeof(new_path));
+                        if (search_path_len < sizeof(new_path))
+                        {
+                            snprintf (new_path + search_path_len, sizeof(new_path) - search_path_len, "/%s", platform_path + bundle_directory_len);
+                            FileSpec new_file_spec (new_path, false);
+                            if (new_file_spec.Exists())
+                            {
+                                ModuleSpec new_module_spec (module_spec);
+                                new_module_spec.GetFileSpec() = new_file_spec;
+                                Error new_error (Platform::GetSharedModule (new_module_spec,
+                                                                            process,
+                                                                            module_sp,
+                                                                            NULL,
+                                                                            old_module_sp_ptr,
+                                                                            did_create_ptr));
+                                
+                                if (module_sp)
+                                {
+                                    module_sp->SetPlatformFileSpec(new_file_spec);
+                                    return new_error;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    if (module_sp)
+        module_sp->SetPlatformFileSpec(module_spec.GetFileSpec());
+    return error;
+}
+
+size_t
+PlatformDarwin::GetSoftwareBreakpointTrapOpcode (Target &target, BreakpointSite *bp_site)
+{
+    const uint8_t *trap_opcode = NULL;
+    uint32_t trap_opcode_size = 0;
+    bool bp_is_thumb = false;
+        
+    llvm::Triple::ArchType machine = target.GetArchitecture().GetMachine();
+    switch (machine)
+    {
+    case llvm::Triple::x86:
+    case llvm::Triple::x86_64:
+        {
+            static const uint8_t g_i386_breakpoint_opcode[] = { 0xCC };
+            trap_opcode = g_i386_breakpoint_opcode;
+            trap_opcode_size = sizeof(g_i386_breakpoint_opcode);
+        }
+        break;
+
+    case llvm::Triple::aarch64:
+        {
+            // TODO: fix this with actual darwin breakpoint opcode for arm64.
+            // right now debugging uses the Z packets with GDB remote so this
+            // is not needed, but the size needs to be correct...
+            static const uint8_t g_arm64_breakpoint_opcode[] = { 0xFE, 0xDE, 0xFF, 0xE7 };
+            trap_opcode = g_arm64_breakpoint_opcode;
+            trap_opcode_size = sizeof(g_arm64_breakpoint_opcode);
+        }
+        break;
+
+    case llvm::Triple::thumb:
+        bp_is_thumb = true; // Fall through...
+    case llvm::Triple::arm:
+        {
+            static const uint8_t g_arm_breakpoint_opcode[] = { 0xFE, 0xDE, 0xFF, 0xE7 };
+            static const uint8_t g_thumb_breakpooint_opcode[] = { 0xFE, 0xDE };
+
+            // Auto detect arm/thumb if it wasn't explicitly specified
+            if (!bp_is_thumb)
+            {
+                lldb::BreakpointLocationSP bp_loc_sp (bp_site->GetOwnerAtIndex (0));
+                if (bp_loc_sp)
+                    bp_is_thumb = bp_loc_sp->GetAddress().GetAddressClass () == eAddressClassCodeAlternateISA;
+            }
+            if (bp_is_thumb)
+            {
+                trap_opcode = g_thumb_breakpooint_opcode;
+                trap_opcode_size = sizeof(g_thumb_breakpooint_opcode);
+                break;
+            }
+            trap_opcode = g_arm_breakpoint_opcode;
+            trap_opcode_size = sizeof(g_arm_breakpoint_opcode);
+        }
+        break;
+        
+    case llvm::Triple::ppc:
+    case llvm::Triple::ppc64:
+        {
+            static const uint8_t g_ppc_breakpoint_opcode[] = { 0x7F, 0xC0, 0x00, 0x08 };
+            trap_opcode = g_ppc_breakpoint_opcode;
+            trap_opcode_size = sizeof(g_ppc_breakpoint_opcode);
+        }
+        break;
+        
+    default:
+        assert(!"Unhandled architecture in PlatformDarwin::GetSoftwareBreakpointTrapOpcode()");
+        break;
+    }
+    
+    if (trap_opcode && trap_opcode_size)
+    {
+        if (bp_site->SetTrapOpcode(trap_opcode, trap_opcode_size))
+            return trap_opcode_size;
+    }
+    return 0;
+
+}
+
+bool
+PlatformDarwin::GetProcessInfo (lldb::pid_t pid, ProcessInstanceInfo &process_info)
+{
+    bool success = false;
+    if (IsHost())
+    {
+        success = Platform::GetProcessInfo (pid, process_info);
+    }
+    else
+    {
+        if (m_remote_platform_sp)
+            success = m_remote_platform_sp->GetProcessInfo (pid, process_info);
+    }
+    return success;
+}
+
+uint32_t
+PlatformDarwin::FindProcesses (const ProcessInstanceInfoMatch &match_info,
+                               ProcessInstanceInfoList &process_infos)
+{
+    uint32_t match_count = 0;
+    if (IsHost())
+    {
+        // Let the base class figure out the host details
+        match_count = Platform::FindProcesses (match_info, process_infos);
+    }
+    else
+    {
+        // If we are remote, we can only return results if we are connected
+        if (m_remote_platform_sp)
+            match_count = m_remote_platform_sp->FindProcesses (match_info, process_infos);
+    }
+    return match_count;    
+}
+
+bool
+PlatformDarwin::ModuleIsExcludedForUnconstrainedSearches (lldb_private::Target &target, const lldb::ModuleSP &module_sp)
+{
+    if (!module_sp)
+        return false;
+        
+    ObjectFile *obj_file = module_sp->GetObjectFile();
+    if (!obj_file)
+        return false;
+    
+    ObjectFile::Type obj_type = obj_file->GetType();
+    if (obj_type == ObjectFile::eTypeDynamicLinker)
+        return true;
+    else
+        return false;
+}
+
+bool
+PlatformDarwin::x86GetSupportedArchitectureAtIndex (uint32_t idx, ArchSpec &arch)
+{
+    ArchSpec host_arch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
+    if (host_arch.GetCore() == ArchSpec::eCore_x86_64_x86_64h)
+    {
+        switch (idx)
+        {
+            case 0:
+                arch = host_arch;
+                return true;
+
+            case 1:
+                arch.SetTriple("x86_64-apple-macosx");
+                return true;
+
+            case 2:
+                arch = HostInfo::GetArchitecture(HostInfo::eArchKind32);
+                return true;
+
+            default: return false;
+        }
+    }
+    else
+    {
+        if (idx == 0)
+        {
+            arch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
+            return arch.IsValid();
+        }
+        else if (idx == 1)
+        {
+            ArchSpec platform_arch(HostInfo::GetArchitecture(HostInfo::eArchKindDefault));
+            ArchSpec platform_arch64(HostInfo::GetArchitecture(HostInfo::eArchKind64));
+            if (platform_arch.IsExactMatch(platform_arch64))
+            {
+                // This macosx platform supports both 32 and 64 bit. Since we already
+                // returned the 64 bit arch for idx == 0, return the 32 bit arch 
+                // for idx == 1
+                arch = HostInfo::GetArchitecture(HostInfo::eArchKind32);
+                return arch.IsValid();
+            }
+        }
+    }
+    return false;
+}
+
+// The architecture selection rules for arm processors
+// These cpu subtypes have distinct names (e.g. armv7f) but armv7 binaries run fine on an armv7f processor.
+
+bool
+PlatformDarwin::ARMGetSupportedArchitectureAtIndex (uint32_t idx, ArchSpec &arch)
+{
+    ArchSpec system_arch (GetSystemArchitecture());
+
+    // When lldb is running on a watch or tv, set the arch OS name appropriately.
+#if defined (TARGET_OS_TV) && TARGET_OS_TV == 1
+#define OSNAME "tvos"
+#elif defined (TARGET_OS_WATCH) && TARGET_OS_WATCH == 1
+#define OSNAME "watchos"
+#else
+#define OSNAME "ios"
+#endif
+
+    const ArchSpec::Core system_core = system_arch.GetCore();
+    switch (system_core)
+    {
+    default:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("arm64-apple-" OSNAME);    return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv7f-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv7k-apple-" OSNAME);   return true;
+            case  4: arch.SetTriple ("armv7s-apple-" OSNAME);   return true;
+            case  5: arch.SetTriple ("armv7m-apple-" OSNAME);   return true;
+            case  6: arch.SetTriple ("armv7em-apple-" OSNAME);  return true;
+            case  7: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  8: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  9: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case 10: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 11: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 12: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case 13: arch.SetTriple ("thumbv7f-apple-" OSNAME); return true;
+            case 14: arch.SetTriple ("thumbv7k-apple-" OSNAME); return true;
+            case 15: arch.SetTriple ("thumbv7s-apple-" OSNAME); return true;
+            case 16: arch.SetTriple ("thumbv7m-apple-" OSNAME); return true;
+            case 17: arch.SetTriple ("thumbv7em-apple-" OSNAME); return true;
+            case 18: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 19: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 20: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 21: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 22: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_arm64:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("arm64-apple-" OSNAME);   return true;
+            case  1: arch.SetTriple ("armv7s-apple-" OSNAME);   return true;
+            case  2: arch.SetTriple ("armv7f-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv7m-apple-" OSNAME);   return true;
+            case  4: arch.SetTriple ("armv7em-apple-" OSNAME);  return true;
+            case  5: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  7: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  8: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  9: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 10: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 11: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv7f-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumbv7k-apple-" OSNAME); return true;
+            case 14: arch.SetTriple ("thumbv7s-apple-" OSNAME); return true;
+            case 15: arch.SetTriple ("thumbv7m-apple-" OSNAME); return true;
+            case 16: arch.SetTriple ("thumbv7em-apple-" OSNAME); return true;
+            case 17: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 18: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 19: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 20: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 21: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+        default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7f:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7f-apple-" OSNAME);   return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  7: arch.SetTriple ("thumbv7f-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 10: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 11: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7k:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7k-apple-" OSNAME);   return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  7: arch.SetTriple ("thumbv7k-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 10: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 11: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7s:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7s-apple-" OSNAME);   return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  7: arch.SetTriple ("thumbv7s-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 10: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 11: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7m:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7m-apple-" OSNAME);   return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  7: arch.SetTriple ("thumbv7m-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 10: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 11: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7em:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7em-apple-" OSNAME);  return true;
+            case  1: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  2: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  3: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  6: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  7: arch.SetTriple ("thumbv7em-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 10: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 11: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 12: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 13: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv7:
+        switch (idx)
+        {
+            case  0: arch.SetTriple ("armv7-apple-" OSNAME);    return true;
+            case  1: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case  2: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case  3: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case  4: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case  5: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case  6: arch.SetTriple ("thumbv7-apple-" OSNAME);  return true;
+            case  7: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case  8: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case  9: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 10: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 11: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv6m:
+        switch (idx)
+        {
+            case 0: arch.SetTriple ("armv6m-apple-" OSNAME);   return true;
+            case 1: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case 2: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case 3: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 4: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 5: arch.SetTriple ("thumbv6m-apple-" OSNAME); return true;
+            case 6: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 7: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 8: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 9: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv6:
+        switch (idx)
+        {
+            case 0: arch.SetTriple ("armv6-apple-" OSNAME);    return true;
+            case 1: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case 2: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 3: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 4: arch.SetTriple ("thumbv6-apple-" OSNAME);  return true;
+            case 5: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 6: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 7: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv5:
+        switch (idx)
+        {
+            case 0: arch.SetTriple ("armv5-apple-" OSNAME);    return true;
+            case 1: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 2: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 3: arch.SetTriple ("thumbv5-apple-" OSNAME);  return true;
+            case 4: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 5: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+
+    case ArchSpec::eCore_arm_armv4:
+        switch (idx)
+        {
+            case 0: arch.SetTriple ("armv4-apple-" OSNAME);    return true;
+            case 1: arch.SetTriple ("arm-apple-" OSNAME);      return true;
+            case 2: arch.SetTriple ("thumbv4t-apple-" OSNAME); return true;
+            case 3: arch.SetTriple ("thumb-apple-" OSNAME);    return true;
+            default: break;
+        }
+        break;
+    }
+    arch.Clear();
+    return false;
+}
+
+
+const char *
+PlatformDarwin::GetDeveloperDirectory()
+{
+    Mutex::Locker locker (m_mutex);
+    if (m_developer_directory.empty())
+    {
+        bool developer_dir_path_valid = false;
+        char developer_dir_path[PATH_MAX];
+        FileSpec temp_file_spec;
+        if (HostInfo::GetLLDBPath(ePathTypeLLDBShlibDir, temp_file_spec))
+        {
+            if (temp_file_spec.GetPath (developer_dir_path, sizeof(developer_dir_path)))
+            {
+                char *shared_frameworks = strstr (developer_dir_path, "/SharedFrameworks/LLDB.framework");
+                if (shared_frameworks)
+                {
+                    ::snprintf (shared_frameworks, 
+                                sizeof(developer_dir_path) - (shared_frameworks - developer_dir_path),
+                                "/Developer");
+                    developer_dir_path_valid = true;
+                }
+                else
+                {
+                    char *lib_priv_frameworks = strstr (developer_dir_path, "/Library/PrivateFrameworks/LLDB.framework");
+                    if (lib_priv_frameworks)
+                    {
+                        *lib_priv_frameworks = '\0';
+                        developer_dir_path_valid = true;
+                    }
+                }
+            }
+        }
+        
+        if (!developer_dir_path_valid)
+        {
+            std::string xcode_dir_path;
+            const char *xcode_select_prefix_dir = getenv ("XCODE_SELECT_PREFIX_DIR");
+            if (xcode_select_prefix_dir)
+                xcode_dir_path.append (xcode_select_prefix_dir);
+            xcode_dir_path.append ("/usr/share/xcode-select/xcode_dir_path");
+            temp_file_spec.SetFile(xcode_dir_path.c_str(), false);
+            size_t bytes_read = temp_file_spec.ReadFileContents(0, developer_dir_path, sizeof(developer_dir_path), NULL);
+            if (bytes_read > 0)
+            {
+                developer_dir_path[bytes_read] = '\0';
+                while (developer_dir_path[bytes_read-1] == '\r' ||
+                       developer_dir_path[bytes_read-1] == '\n')
+                    developer_dir_path[--bytes_read] = '\0';
+                developer_dir_path_valid = true;
+            }
+        }
+        
+        if (!developer_dir_path_valid)
+        {
+            FileSpec xcode_select_cmd ("/usr/bin/xcode-select", false);
+            if (xcode_select_cmd.Exists())
+            {
+                int exit_status = -1;
+                int signo = -1;
+                std::string command_output;
+                Error error = Host::RunShellCommand ("/usr/bin/xcode-select --print-path", 
+                                                     NULL,                                 // current working directory
+                                                     &exit_status,
+                                                     &signo,
+                                                     &command_output,
+                                                     2,                                     // short timeout
+                                                     false);                                // don't run in a shell
+                if (error.Success() && exit_status == 0 && !command_output.empty())
+                {
+                    const char *cmd_output_ptr = command_output.c_str();
+                    developer_dir_path[sizeof (developer_dir_path) - 1] = '\0';
+                    size_t i;
+                    for (i = 0; i < sizeof (developer_dir_path) - 1; i++)
+                    {
+                        if (cmd_output_ptr[i] == '\r' || cmd_output_ptr[i] == '\n' || cmd_output_ptr[i] == '\0')
+                            break;
+                        developer_dir_path[i] = cmd_output_ptr[i];
+                    }
+                    developer_dir_path[i] = '\0';
+
+                    FileSpec devel_dir (developer_dir_path, false);
+                    if (devel_dir.Exists() && devel_dir.IsDirectory())
+                    {
+                        developer_dir_path_valid = true;
+                    }
+                }
+            }
+        }
+
+        if (developer_dir_path_valid)
+        {
+            temp_file_spec.SetFile (developer_dir_path, false);
+            if (temp_file_spec.Exists())
+            {
+                m_developer_directory.assign (developer_dir_path);
+                return m_developer_directory.c_str();
+            }
+        }
+        // Assign a single NULL character so we know we tried to find the device
+        // support directory and we don't keep trying to find it over and over.
+        m_developer_directory.assign (1, '\0');
+    }
+    
+    // We should have put a single NULL character into m_developer_directory
+    // or it should have a valid path if the code gets here
+    assert (m_developer_directory.empty() == false);
+    if (m_developer_directory[0])
+        return m_developer_directory.c_str();
+    return NULL;
+}
+
+
+BreakpointSP
+PlatformDarwin::SetThreadCreationBreakpoint (Target &target)
+{
+    BreakpointSP bp_sp;
+    static const char *g_bp_names[] =
+    {
+        "start_wqthread",
+        "_pthread_wqthread",
+        "_pthread_start",
+    };
+
+    static const char *g_bp_modules[] =
+    {
+        "libsystem_c.dylib",
+        "libSystem.B.dylib"
+    };
+
+    FileSpecList bp_modules;
+    for (size_t i = 0; i < llvm::array_lengthof(g_bp_modules); i++)
+    {
+        const char *bp_module = g_bp_modules[i];
+        bp_modules.Append(FileSpec(bp_module, false));
+    }
+
+    bool internal = true;
+    bool hardware = false;
+    LazyBool skip_prologue = eLazyBoolNo;
+    bp_sp = target.CreateBreakpoint (&bp_modules,
+                                     NULL,
+                                     g_bp_names,
+                                     llvm::array_lengthof(g_bp_names),
+                                     eFunctionNameTypeFull,
+                                     eLanguageTypeUnknown,
+                                     skip_prologue,
+                                     internal,
+                                     hardware);
+    bp_sp->SetBreakpointKind("thread-creation");
+
+    return bp_sp;
+}
+
+
+int32_t
+PlatformDarwin::GetResumeCountForLaunchInfo (ProcessLaunchInfo &launch_info)
+{
+    const FileSpec &shell = launch_info.GetShell();
+    if (!shell)
+        return 1;
+        
+    std::string shell_string = shell.GetPath();
+    const char *shell_name = strrchr (shell_string.c_str(), '/');
+    if (shell_name == NULL)
+        shell_name = shell_string.c_str();
+    else
+        shell_name++;
+    
+    if (strcmp (shell_name, "sh") == 0)
+    {
+        // /bin/sh re-exec's itself as /bin/bash requiring another resume.
+        // But it only does this if the COMMAND_MODE environment variable
+        // is set to "legacy".
+        const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector();
+        if (envp != NULL)
+        {
+            for (int i = 0; envp[i] != NULL; i++)
+            {
+                if (strcmp (envp[i], "COMMAND_MODE=legacy" ) == 0)
+                    return 2;
+            }
+        }
+        return 1;
+    }
+    else if (strcmp (shell_name, "csh") == 0
+            || strcmp (shell_name, "tcsh") == 0
+            || strcmp (shell_name, "zsh") == 0)
+    {
+        // csh and tcsh always seem to re-exec themselves.
+        return 2;
+    }
+    else
+        return 1;
+}
+
+void
+PlatformDarwin::CalculateTrapHandlerSymbolNames ()
+{   
+    m_trap_handlers.push_back (ConstString ("_sigtramp"));
+}
+
+
+static const char *const sdk_strings[] = {
+    "MacOSX",
+    "iPhoneSimulator",
+    "iPhoneOS",
+};
+
+static FileSpec
+CheckPathForXcode(const FileSpec &fspec)
+{
+    if (fspec.Exists())
+    {
+        const char substr[] = ".app/Contents/";
+
+        std::string path_to_shlib = fspec.GetPath();
+        size_t pos = path_to_shlib.rfind(substr);
+        if (pos != std::string::npos)
+        {
+            path_to_shlib.erase(pos + strlen(substr));
+            FileSpec ret (path_to_shlib.c_str(), false);
+            
+            FileSpec xcode_binary_path = ret;
+            xcode_binary_path.AppendPathComponent("MacOS");
+            xcode_binary_path.AppendPathComponent("Xcode");
+            
+            if (xcode_binary_path.Exists())
+            {
+                return ret;
+            }
+        }
+    }
+    return FileSpec();
+}
+
+static FileSpec
+GetXcodeContentsPath ()
+{
+    static FileSpec g_xcode_filespec;
+    static std::once_flag g_once_flag;
+    std::call_once(g_once_flag, []() {
+
+
+        FileSpec fspec;
+
+        // First get the program file spec. If lldb.so or LLDB.framework is running
+        // in a program and that program is Xcode, the path returned with be the path
+        // to Xcode.app/Contents/MacOS/Xcode, so this will be the correct Xcode to use.
+        fspec = HostInfo::GetProgramFileSpec();
+
+        if (fspec)
+        {
+            // Ignore the current binary if it is python.
+            std::string basename_lower = fspec.GetFilename ().GetCString ();
+            std::transform(basename_lower.begin (), basename_lower.end (), basename_lower.begin (), tolower);
+            if (basename_lower != "python")
+            {
+                g_xcode_filespec = CheckPathForXcode(fspec);
+            }
+        }
+
+        // Next check DEVELOPER_DIR environment variable
+        if (!g_xcode_filespec)
+        {
+            const char *developer_dir_env_var = getenv("DEVELOPER_DIR");
+            if (developer_dir_env_var && developer_dir_env_var[0])
+            {
+                g_xcode_filespec = CheckPathForXcode(FileSpec(developer_dir_env_var, true));
+            }
+
+            // Fall back to using "xcrun" to find the selected Xcode
+            if (!g_xcode_filespec)
+            {
+                int status = 0;
+                int signo = 0;
+                std::string output;
+                const char *command = "/usr/bin/xcode-select -p";
+                lldb_private::Error error = Host::RunShellCommand (command,   // shell command to run
+                                                                   NULL,      // current working directory
+                                                                   &status,   // Put the exit status of the process in here
+                                                                   &signo,    // Put the signal that caused the process to exit in here
+                                                                   &output,   // Get the output from the command and place it in this string
+                                                                   3);        // Timeout in seconds to wait for shell program to finish
+                if (status == 0 && !output.empty())
+                {
+                    size_t first_non_newline = output.find_last_not_of("\r\n");
+                    if (first_non_newline != std::string::npos)
+                    {
+                        output.erase(first_non_newline+1);
+                    }
+                    output.append("/..");
+
+                    g_xcode_filespec = CheckPathForXcode(FileSpec(output.c_str(), false));
+                }
+            }
+        }
+    });
+    
+    return g_xcode_filespec;
+}
+
+bool
+PlatformDarwin::SDKSupportsModules (SDKType sdk_type, uint32_t major, uint32_t minor, uint32_t micro)
+{
+    switch (sdk_type)
+    {
+        case SDKType::MacOSX:
+            if (major > 10 || (major == 10 && minor >= 10))
+                return true;
+            break;
+        case SDKType::iPhoneOS:
+        case SDKType::iPhoneSimulator:
+            if (major >= 8)
+                return true;
+            break;
+    }
+    
+    return false;
+}
+
+bool
+PlatformDarwin::SDKSupportsModules (SDKType desired_type, const FileSpec &sdk_path)
+{
+    ConstString last_path_component = sdk_path.GetLastPathComponent();
+    
+    if (last_path_component)
+    {
+        const llvm::StringRef sdk_name = last_path_component.GetStringRef();
+        
+        llvm::StringRef version_part;
+        
+        if (sdk_name.startswith(sdk_strings[(int)desired_type]))
+        {
+            version_part = sdk_name.drop_front(strlen(sdk_strings[(int)desired_type]));
+        }
+        else
+        {
+            return false;
+        }
+        
+        const size_t major_dot_offset = version_part.find('.');
+        if (major_dot_offset == llvm::StringRef::npos)
+            return false;
+        
+        const llvm::StringRef major_version = version_part.slice(0, major_dot_offset);
+        const llvm::StringRef minor_part = version_part.drop_front(major_dot_offset + 1);
+        
+        const size_t minor_dot_offset = minor_part.find('.');
+        if (minor_dot_offset == llvm::StringRef::npos)
+            return false;
+        
+        const llvm::StringRef minor_version = minor_part.slice(0, minor_dot_offset);
+        
+        unsigned int major = 0;
+        unsigned int minor = 0;
+        unsigned int micro = 0;
+        
+        if (major_version.getAsInteger(10, major))
+            return false;
+        
+        if (minor_version.getAsInteger(10, minor))
+            return false;
+        
+        return SDKSupportsModules(desired_type, major, minor, micro);
+    }
+    
+    return false;
+}
+
+FileSpec::EnumerateDirectoryResult
+PlatformDarwin::DirectoryEnumerator(void *baton,
+                                    FileSpec::FileType file_type,
+                                    const FileSpec &spec)
+{
+    SDKEnumeratorInfo *enumerator_info = static_cast<SDKEnumeratorInfo*>(baton);
+    
+    if (SDKSupportsModules(enumerator_info->sdk_type, spec))
+    {
+        enumerator_info->found_path = spec;
+        return FileSpec::EnumerateDirectoryResult::eEnumerateDirectoryResultNext;
+    }
+    
+    return FileSpec::EnumerateDirectoryResult::eEnumerateDirectoryResultNext;
+}
+
+FileSpec
+PlatformDarwin::FindSDKInXcodeForModules (SDKType sdk_type,
+                                          const FileSpec &sdks_spec)
+{
+    // Look inside Xcode for the required installed iOS SDK version
+    
+    if (!sdks_spec.IsDirectory())
+        return FileSpec();
+    
+    const bool find_directories = true;
+    const bool find_files = false;
+    const bool find_other = true; // include symlinks
+    
+    SDKEnumeratorInfo enumerator_info;
+    
+    enumerator_info.sdk_type = sdk_type;
+    
+    FileSpec::EnumerateDirectory(sdks_spec.GetPath().c_str(),
+                                 find_directories,
+                                 find_files,
+                                 find_other,
+                                 DirectoryEnumerator,
+                                 &enumerator_info);
+    
+    if (enumerator_info.found_path.IsDirectory())
+        return enumerator_info.found_path;
+    else
+        return FileSpec();
+}
+
+FileSpec
+PlatformDarwin::GetSDKDirectoryForModules (SDKType sdk_type)
+{
+    switch (sdk_type)
+    {
+        case SDKType::MacOSX:
+        case SDKType::iPhoneSimulator:
+        case SDKType::iPhoneOS:
+            break;
+    }
+    
+    FileSpec sdks_spec = GetXcodeContentsPath();
+    sdks_spec.AppendPathComponent("Developer");
+    sdks_spec.AppendPathComponent("Platforms");
+    
+    switch (sdk_type)
+    {
+        case SDKType::MacOSX:
+            sdks_spec.AppendPathComponent("MacOSX.platform");
+            break;
+        case SDKType::iPhoneSimulator:
+            sdks_spec.AppendPathComponent("iPhoneSimulator.platform");
+            break;
+        case SDKType::iPhoneOS:
+            sdks_spec.AppendPathComponent("iPhoneOS.platform");
+            break;
+    }
+    
+    sdks_spec.AppendPathComponent("Developer");
+    sdks_spec.AppendPathComponent("SDKs");
+    
+    if (sdk_type == SDKType::MacOSX)
+    {
+        uint32_t major = 0;
+        uint32_t minor = 0;
+        uint32_t micro = 0;
+        
+        if (HostInfo::GetOSVersion(major, minor, micro))
+        {
+            if (SDKSupportsModules(SDKType::MacOSX, major, minor, micro))
+            {
+                // We slightly prefer the exact SDK for this machine.  See if it is there.
+                
+                FileSpec native_sdk_spec = sdks_spec;
+                StreamString native_sdk_name;
+                native_sdk_name.Printf("MacOSX%u.%u.sdk", major, minor);
+                native_sdk_spec.AppendPathComponent(native_sdk_name.GetString().c_str());
+                
+                if (native_sdk_spec.Exists())
+                {
+                    return native_sdk_spec;
+                }
+            }
+        }
+    }
+    
+    return FindSDKInXcodeForModules(sdk_type, sdks_spec);
+}
+
+void
+PlatformDarwin::AddClangModuleCompilationOptionsForSDKType (Target *target, std::vector<std::string> &options, SDKType sdk_type)
+{
+    const std::vector<std::string> apple_arguments =
+    {
+        "-x", "objective-c++",
+        "-fobjc-arc",
+        "-fblocks",
+        "-D_ISO646_H",
+        "-D__ISO646_H"
+    };
+    
+    options.insert(options.end(),
+                   apple_arguments.begin(),
+                   apple_arguments.end());
+    
+    StreamString minimum_version_option;
+    uint32_t versions[3] = { 0, 0, 0 };
+    bool use_current_os_version = false;
+    switch (sdk_type)
+    {
+        case SDKType::iPhoneOS:
+#if defined (__arm__) || defined (__arm64__) || defined (__aarch64__)
+            use_current_os_version = true;
+#else
+            use_current_os_version = false;
+#endif
+            break;
+
+        case SDKType::iPhoneSimulator:
+            use_current_os_version = false;
+            break;
+
+        case SDKType::MacOSX:
+#if defined (__i386__) || defined (__x86_64__)
+            use_current_os_version = true;
+#else
+            use_current_os_version = false;
+#endif
+            break;
+    }
+
+    bool versions_valid = false;
+    if (use_current_os_version)
+        versions_valid = GetOSVersion(versions[0], versions[1], versions[2]);
+    else if (target)
+    {
+        // Our OS doesn't match our executable so we need to get the min OS version from the object file
+        ModuleSP exe_module_sp = target->GetExecutableModule();
+        if (exe_module_sp)
+        {
+            ObjectFile *object_file = exe_module_sp->GetObjectFile();
+            if (object_file)
+                versions_valid = object_file->GetMinimumOSVersion(versions, 3) > 0;
+        }
+    }
+    // Only add the version-min options if we got a version from somewhere
+    if (versions_valid && versions[0] != UINT32_MAX)
+    {
+        // Make any invalid versions be zero if needed
+        if (versions[1] == UINT32_MAX)
+            versions[1] = 0;
+        if (versions[2] == UINT32_MAX)
+            versions[2] = 0;
+        
+        switch (sdk_type)
+        {
+        case SDKType::iPhoneOS:
+            minimum_version_option.PutCString("-mios-version-min=");
+            minimum_version_option.PutCString(clang::VersionTuple(versions[0], versions[1], versions[2]).getAsString().c_str());
+            break;
+        case SDKType::iPhoneSimulator:
+            minimum_version_option.PutCString("-mios-simulator-version-min=");
+            minimum_version_option.PutCString(clang::VersionTuple(versions[0], versions[1], versions[2]).getAsString().c_str());
+            break;
+        case SDKType::MacOSX:
+            minimum_version_option.PutCString("-mmacosx-version-min=");
+            minimum_version_option.PutCString(clang::VersionTuple(versions[0], versions[1], versions[2]).getAsString().c_str());
+        }
+        options.push_back(minimum_version_option.GetString());
+    }
+
+    FileSpec sysroot_spec;
+    // Scope for mutex locker below
+    {
+        Mutex::Locker locker (m_mutex);
+        sysroot_spec = GetSDKDirectoryForModules(sdk_type);
+    }
+    
+    if (sysroot_spec.IsDirectory())
+    {
+        options.push_back("-isysroot");
+        options.push_back(sysroot_spec.GetPath());
+    }
+}
+
+ConstString
+PlatformDarwin::GetFullNameForDylib (ConstString basename)
+{
+    if (basename.IsEmpty())
+        return basename;
+    
+    StreamString stream;
+    stream.Printf("lib%s.dylib", basename.GetCString());
+    return ConstString(stream.GetData());
+}
+
+bool
+PlatformDarwin::GetOSVersion (uint32_t &major,
+                              uint32_t &minor,
+                              uint32_t &update,
+                              Process *process)
+{
+    if (process && strstr(GetPluginName().GetCString(), "-simulator"))
+    {
+        lldb_private::ProcessInstanceInfo proc_info;
+        if (Host::GetProcessInfo(process->GetID(), proc_info))
+        {
+            Args &env = proc_info.GetEnvironmentEntries();
+            const size_t n = env.GetArgumentCount();
+            const llvm::StringRef k_runtime_version("SIMULATOR_RUNTIME_VERSION=");
+            const llvm::StringRef k_dyld_root_path("DYLD_ROOT_PATH=");
+            std::string dyld_root_path;
+
+            for (size_t i=0; i<n; ++i)
+            {
+                const char *env_cstr = env.GetArgumentAtIndex(i);
+                if (env_cstr)
+                {
+                    llvm::StringRef env_str(env_cstr);
+                    if (env_str.startswith(k_runtime_version))
+                    {
+                        llvm::StringRef version_str(env_str.substr(k_runtime_version.size()));
+                        Args::StringToVersion (version_str.data(), major, minor, update);
+                        if (major != UINT32_MAX)
+                            return true;
+                    }
+                    else if (env_str.startswith(k_dyld_root_path))
+                    {
+                        dyld_root_path = env_str.substr(k_dyld_root_path.size()).str();
+                    }
+                }
+            }
+
+            if (!dyld_root_path.empty())
+            {
+                dyld_root_path += "/System/Library/CoreServices/SystemVersion.plist";
+                ApplePropertyList system_version_plist(dyld_root_path.c_str());
+                std::string product_version;
+                if (system_version_plist.GetValueAsString("ProductVersion", product_version))
+                {
+                    Args::StringToVersion (product_version.c_str(), major, minor, update);
+                    return major != UINT32_MAX;
+                }
+            }
+
+        }
+        // For simulator platforms, do NOT call back through Platform::GetOSVersion()
+        // as it might call Process::GetHostOSVersion() which we don't want as it will be
+        // incorrect
+        return false;
+    }
+
+    return Platform::GetOSVersion(major, minor, update, process);
+}
+
+lldb_private::FileSpec
+PlatformDarwin::LocateExecutable (const char *basename)
+{
+    // A collection of SBFileSpec whose SBFileSpec.m_directory members are filled in with
+    // any executable directories that should be searched.
+    static std::vector<FileSpec> g_executable_dirs;
+
+    // Find the global list of directories that we will search for
+    // executables once so we don't keep doing the work over and over.
+    static std::once_flag g_once_flag;
+    std::call_once(g_once_flag,  []() {
+
+        // When locating executables, trust the DEVELOPER_DIR first if it is set
+        FileSpec xcode_contents_dir = GetXcodeContentsPath();
+        if (xcode_contents_dir)
+        {
+            FileSpec xcode_lldb_resources = xcode_contents_dir;
+            xcode_lldb_resources.AppendPathComponent("SharedFrameworks");
+            xcode_lldb_resources.AppendPathComponent("LLDB.framework");
+            xcode_lldb_resources.AppendPathComponent("Resources");
+            if (xcode_lldb_resources.Exists())
+            {
+                FileSpec dir;
+                dir.GetDirectory().SetCString(xcode_lldb_resources.GetPath().c_str());
+                g_executable_dirs.push_back(dir);
+            }
+        }
+    });
+
+    // Now search the global list of executable directories for the executable we
+    // are looking for
+    for (const auto &executable_dir : g_executable_dirs)
+    {
+        FileSpec executable_file;
+        executable_file.GetDirectory() = executable_dir.GetDirectory();
+        executable_file.GetFilename().SetCString(basename);
+        if (executable_file.Exists())
+            return executable_file;
+    }
+
+    return FileSpec();
+}