contrib/llvm/tools/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp

   1 //===-- PlatformRemoteGDBServer.cpp -----------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "PlatformRemoteGDBServer.h"
  11 #include "lldb/Host/Config.h"
  12
  13 // C++ Includes
  14 // Other libraries and framework includes
  15 // Project includes
  16 #include "lldb/Breakpoint/BreakpointLocation.h"
  17 #include "lldb/Core/Debugger.h"
  18 #include "lldb/Core/Module.h"
  19 #include "lldb/Core/ModuleList.h"
  20 #include "lldb/Core/ModuleSpec.h"
  21 #include "lldb/Core/PluginManager.h"
  22 #include "lldb/Core/StreamFile.h"
  23 #include "lldb/Host/ConnectionFileDescriptor.h"
  24 #include "lldb/Host/Host.h"
  25 #include "lldb/Host/HostInfo.h"
  26 #include "lldb/Target/Process.h"
  27 #include "lldb/Target/Target.h"
  28 #include "lldb/Utility/FileSpec.h"
  29 #include "lldb/Utility/Log.h"
  30 #include "lldb/Utility/Status.h"
  31 #include "lldb/Utility/StreamString.h"
  32 #include "lldb/Utility/UriParser.h"
  33
  34 #include "Plugins/Process/Utility/GDBRemoteSignals.h"
  35
  36 using namespace lldb;
  37 using namespace lldb_private;
  38 using namespace lldb_private::platform_gdb_server;
  39
  40 static bool g_initialized = false;
  41
  42 void PlatformRemoteGDBServer::Initialize() {
  43   Platform::Initialize();
  44
  45   if (g_initialized == false) {
  46     g_initialized = true;
  47     PluginManager::RegisterPlugin(
  48         PlatformRemoteGDBServer::GetPluginNameStatic(),
  49         PlatformRemoteGDBServer::GetDescriptionStatic(),
  50         PlatformRemoteGDBServer::CreateInstance);
  51   }
  52 }
  53
  54 void PlatformRemoteGDBServer::Terminate() {
  55   if (g_initialized) {
  56     g_initialized = false;
  57     PluginManager::UnregisterPlugin(PlatformRemoteGDBServer::CreateInstance);
  58   }
  59
  60   Platform::Terminate();
  61 }
  62
  63 PlatformSP PlatformRemoteGDBServer::CreateInstance(bool force,
  64                                                    const ArchSpec *arch) {
  65   bool create = force;
  66   if (!create) {
  67     create = !arch->TripleVendorWasSpecified() && !arch->TripleOSWasSpecified();
  68   }
  69   if (create)
  70     return PlatformSP(new PlatformRemoteGDBServer());
  71   return PlatformSP();
  72 }
  73
  74 ConstString PlatformRemoteGDBServer::GetPluginNameStatic() {
  75   static ConstString g_name("remote-gdb-server");
  76   return g_name;
  77 }
  78
  79 const char *PlatformRemoteGDBServer::GetDescriptionStatic() {
  80   return "A platform that uses the GDB remote protocol as the communication "
  81          "transport.";
  82 }
  83
  84 const char *PlatformRemoteGDBServer::GetDescription() {
  85   if (m_platform_description.empty()) {
  86     if (IsConnected()) {
  87       // Send the get description packet
  88     }
  89   }
  90
  91   if (!m_platform_description.empty())
  92     return m_platform_description.c_str();
  93   return GetDescriptionStatic();
  94 }
  95
  96 Status PlatformRemoteGDBServer::ResolveExecutable(
  97     const ModuleSpec &module_spec, lldb::ModuleSP &exe_module_sp,
  98     const FileSpecList *module_search_paths_ptr) {
  99   // copied from PlatformRemoteiOS
 100
 101   Status error;
 102   // Nothing special to do here, just use the actual file and architecture
 103
 104   ModuleSpec resolved_module_spec(module_spec);
 105
 106   // Resolve any executable within an apk on Android?
 107   // Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
 108
 109   if (resolved_module_spec.GetFileSpec().Exists() ||
 110       module_spec.GetUUID().IsValid()) {
 111     if (resolved_module_spec.GetArchitecture().IsValid() ||
 112         resolved_module_spec.GetUUID().IsValid()) {
 113       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 114                                           module_search_paths_ptr, NULL, NULL);
 115
 116       if (exe_module_sp && exe_module_sp->GetObjectFile())
 117         return error;
 118       exe_module_sp.reset();
 119     }
 120     // No valid architecture was specified or the exact arch wasn't
 121     // found so ask the platform for the architectures that we should be
 122     // using (in the correct order) and see if we can find a match that way
 123     StreamString arch_names;
 124     for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
 125              idx, resolved_module_spec.GetArchitecture());
 126          ++idx) {
 127       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 128                                           module_search_paths_ptr, NULL, NULL);
 129       // Did we find an executable using one of the
 130       if (error.Success()) {
 131         if (exe_module_sp && exe_module_sp->GetObjectFile())
 132           break;
 133         else
 134           error.SetErrorToGenericError();
 135       }
 136
 137       if (idx > 0)
 138         arch_names.PutCString(", ");
 139       arch_names.PutCString(
 140           resolved_module_spec.GetArchitecture().GetArchitectureName());
 141     }
 142
 143     if (error.Fail() || !exe_module_sp) {
 144       if (resolved_module_spec.GetFileSpec().Readable()) {
 145         error.SetErrorStringWithFormat(
 146             "'%s' doesn't contain any '%s' platform architectures: %s",
 147             resolved_module_spec.GetFileSpec().GetPath().c_str(),
 148             GetPluginName().GetCString(), arch_names.GetData());
 149       } else {
 150         error.SetErrorStringWithFormat(
 151             "'%s' is not readable",
 152             resolved_module_spec.GetFileSpec().GetPath().c_str());
 153       }
 154     }
 155   } else {
 156     error.SetErrorStringWithFormat(
 157         "'%s' does not exist",
 158         resolved_module_spec.GetFileSpec().GetPath().c_str());
 159   }
 160
 161   return error;
 162 }
 163
 164 bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,
 165                                             const ArchSpec &arch,
 166                                             ModuleSpec &module_spec) {
 167   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 168
 169   const auto module_path = module_file_spec.GetPath(false);
 170
 171   if (!m_gdb_client.GetModuleInfo(module_file_spec, arch, module_spec)) {
 172     if (log)
 173       log->Printf(
 174           "PlatformRemoteGDBServer::%s - failed to get module info for %s:%s",
 175           __FUNCTION__, module_path.c_str(),
 176           arch.GetTriple().getTriple().c_str());
 177     return false;
 178   }
 179
 180   if (log) {
 181     StreamString stream;
 182     module_spec.Dump(stream);
 183     log->Printf(
 184         "PlatformRemoteGDBServer::%s - got module info for (%s:%s) : %s",
 185         __FUNCTION__, module_path.c_str(), arch.GetTriple().getTriple().c_str(),
 186         stream.GetData());
 187   }
 188
 189   return true;
 190 }
 191
 192 Status PlatformRemoteGDBServer::GetFileWithUUID(const FileSpec &platform_file,
 193                                                 const UUID *uuid_ptr,
 194                                                 FileSpec &local_file) {
 195   // Default to the local case
 196   local_file = platform_file;
 197   return Status();
 198 }
 199
 200 //------------------------------------------------------------------
 201 /// Default Constructor
 202 //------------------------------------------------------------------
 203 PlatformRemoteGDBServer::PlatformRemoteGDBServer()
 204     : Platform(false), // This is a remote platform
 205       m_gdb_client() {}
 206
 207 //------------------------------------------------------------------
 208 /// Destructor.
 209 ///
 210 /// The destructor is virtual since this class is designed to be
 211 /// inherited from by the plug-in instance.
 212 //------------------------------------------------------------------
 213 PlatformRemoteGDBServer::~PlatformRemoteGDBServer() {}
 214
 215 bool PlatformRemoteGDBServer::GetSupportedArchitectureAtIndex(uint32_t idx,
 216                                                               ArchSpec &arch) {
 217   ArchSpec remote_arch = m_gdb_client.GetSystemArchitecture();
 218
 219   if (idx == 0) {
 220     arch = remote_arch;
 221     return arch.IsValid();
 222   } else if (idx == 1 && remote_arch.IsValid() &&
 223              remote_arch.GetTriple().isArch64Bit()) {
 224     arch.SetTriple(remote_arch.GetTriple().get32BitArchVariant());
 225     return arch.IsValid();
 226   }
 227   return false;
 228 }
 229
 230 size_t PlatformRemoteGDBServer::GetSoftwareBreakpointTrapOpcode(
 231     Target &target, BreakpointSite *bp_site) {
 232   // This isn't needed if the z/Z packets are supported in the GDB remote
 233   // server. But we might need a packet to detect this.
 234   return 0;
 235 }
 236
 237 bool PlatformRemoteGDBServer::GetRemoteOSVersion() {
 238   uint32_t major, minor, update;
 239   if (m_gdb_client.GetOSVersion(major, minor, update)) {
 240     m_major_os_version = major;
 241     m_minor_os_version = minor;
 242     m_update_os_version = update;
 243     return true;
 244   }
 245   return false;
 246 }
 247
 248 bool PlatformRemoteGDBServer::GetRemoteOSBuildString(std::string &s) {
 249   return m_gdb_client.GetOSBuildString(s);
 250 }
 251
 252 bool PlatformRemoteGDBServer::GetRemoteOSKernelDescription(std::string &s) {
 253   return m_gdb_client.GetOSKernelDescription(s);
 254 }
 255
 256 // Remote Platform subclasses need to override this function
 257 ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {
 258   return m_gdb_client.GetSystemArchitecture();
 259 }
 260
 261 FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {
 262   if (IsConnected()) {
 263     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 264     FileSpec working_dir;
 265     if (m_gdb_client.GetWorkingDir(working_dir) && log)
 266       log->Printf(
 267           "PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",
 268           working_dir.GetCString());
 269     return working_dir;
 270   } else {
 271     return Platform::GetRemoteWorkingDirectory();
 272   }
 273 }
 274
 275 bool PlatformRemoteGDBServer::SetRemoteWorkingDirectory(
 276     const FileSpec &working_dir) {
 277   if (IsConnected()) {
 278     // Clear the working directory it case it doesn't get set correctly. This
 279     // will
 280     // for use to re-read it
 281     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 282     if (log)
 283       log->Printf("PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",
 284                   working_dir.GetCString());
 285     return m_gdb_client.SetWorkingDir(working_dir) == 0;
 286   } else
 287     return Platform::SetRemoteWorkingDirectory(working_dir);
 288 }
 289
 290 bool PlatformRemoteGDBServer::IsConnected() const {
 291   return m_gdb_client.IsConnected();
 292 }
 293
 294 Status PlatformRemoteGDBServer::ConnectRemote(Args &args) {
 295   Status error;
 296   if (IsConnected()) {
 297     error.SetErrorStringWithFormat("the platform is already connected to '%s', "
 298                                    "execute 'platform disconnect' to close the "
 299                                    "current connection",
 300                                    GetHostname());
 301   } else {
 302     if (args.GetArgumentCount() == 1) {
 303       m_gdb_client.SetConnection(new ConnectionFileDescriptor());
 304       // we're going to reuse the hostname when we connect to the debugserver
 305       int port;
 306       std::string path;
 307       const char *url = args.GetArgumentAtIndex(0);
 308       if (!url)
 309         return Status("URL is null.");
 310       llvm::StringRef scheme, hostname, pathname;
 311       if (!UriParser::Parse(url, scheme, hostname, port, pathname))
 312         return Status("Invalid URL: %s", url);
 313       m_platform_scheme = scheme;
 314       m_platform_hostname = hostname;
 315       path = pathname;
 316
 317       const ConnectionStatus status = m_gdb_client.Connect(url, &error);
 318       if (status == eConnectionStatusSuccess) {
 319         if (m_gdb_client.HandshakeWithServer(&error)) {
 320           m_gdb_client.GetHostInfo();
 321           // If a working directory was set prior to connecting, send it down
 322           // now
 323           if (m_working_dir)
 324             m_gdb_client.SetWorkingDir(m_working_dir);
 325         } else {
 326           m_gdb_client.Disconnect();
 327           if (error.Success())
 328             error.SetErrorString("handshake failed");
 329         }
 330       }
 331     } else {
 332       error.SetErrorString(
 333           "\"platform connect\" takes a single argument: <connect-url>");
 334     }
 335   }
 336   return error;
 337 }
 338
 339 Status PlatformRemoteGDBServer::DisconnectRemote() {
 340   Status error;
 341   m_gdb_client.Disconnect(&error);
 342   m_remote_signals_sp.reset();
 343   return error;
 344 }
 345
 346 const char *PlatformRemoteGDBServer::GetHostname() {
 347   m_gdb_client.GetHostname(m_name);
 348   if (m_name.empty())
 349     return NULL;
 350   return m_name.c_str();
 351 }
 352
 353 const char *PlatformRemoteGDBServer::GetUserName(uint32_t uid) {
 354   // Try and get a cache user name first
 355   const char *cached_user_name = Platform::GetUserName(uid);
 356   if (cached_user_name)
 357     return cached_user_name;
 358   std::string name;
 359   if (m_gdb_client.GetUserName(uid, name))
 360     return SetCachedUserName(uid, name.c_str(), name.size());
 361
 362   SetUserNameNotFound(uid); // Negative cache so we don't keep sending packets
 363   return NULL;
 364 }
 365
 366 const char *PlatformRemoteGDBServer::GetGroupName(uint32_t gid) {
 367   const char *cached_group_name = Platform::GetGroupName(gid);
 368   if (cached_group_name)
 369     return cached_group_name;
 370   std::string name;
 371   if (m_gdb_client.GetGroupName(gid, name))
 372     return SetCachedGroupName(gid, name.c_str(), name.size());
 373
 374   SetGroupNameNotFound(gid); // Negative cache so we don't keep sending packets
 375   return NULL;
 376 }
 377
 378 uint32_t PlatformRemoteGDBServer::FindProcesses(
 379     const ProcessInstanceInfoMatch &match_info,
 380     ProcessInstanceInfoList &process_infos) {
 381   return m_gdb_client.FindProcesses(match_info, process_infos);
 382 }
 383
 384 bool PlatformRemoteGDBServer::GetProcessInfo(
 385     lldb::pid_t pid, ProcessInstanceInfo &process_info) {
 386   return m_gdb_client.GetProcessInfo(pid, process_info);
 387 }
 388
 389 Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {
 390   Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
 391   Status error;
 392
 393   if (log)
 394     log->Printf("PlatformRemoteGDBServer::%s() called", __FUNCTION__);
 395
 396   auto num_file_actions = launch_info.GetNumFileActions();
 397   for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) {
 398     const auto file_action = launch_info.GetFileActionAtIndex(i);
 399     if (file_action->GetAction() != FileAction::eFileActionOpen)
 400       continue;
 401     switch (file_action->GetFD()) {
 402     case STDIN_FILENO:
 403       m_gdb_client.SetSTDIN(file_action->GetFileSpec());
 404       break;
 405     case STDOUT_FILENO:
 406       m_gdb_client.SetSTDOUT(file_action->GetFileSpec());
 407       break;
 408     case STDERR_FILENO:
 409       m_gdb_client.SetSTDERR(file_action->GetFileSpec());
 410       break;
 411     }
 412   }
 413
 414   m_gdb_client.SetDisableASLR(
 415       launch_info.GetFlags().Test(eLaunchFlagDisableASLR));
 416   m_gdb_client.SetDetachOnError(
 417       launch_info.GetFlags().Test(eLaunchFlagDetachOnError));
 418
 419   FileSpec working_dir = launch_info.GetWorkingDirectory();
 420   if (working_dir) {
 421     m_gdb_client.SetWorkingDir(working_dir);
 422   }
 423
 424   // Send the environment and the program + arguments after we connect
 425   const char **envp =
 426       launch_info.GetEnvironmentEntries().GetConstArgumentVector();
 427
 428   if (envp) {
 429     const char *env_entry;
 430     for (int i = 0; (env_entry = envp[i]); ++i) {
 431       if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0)
 432         break;
 433     }
 434   }
 435
 436   ArchSpec arch_spec = launch_info.GetArchitecture();
 437   const char *arch_triple = arch_spec.GetTriple().str().c_str();
 438
 439   m_gdb_client.SendLaunchArchPacket(arch_triple);
 440   if (log)
 441     log->Printf(
 442         "PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",
 443         __FUNCTION__, arch_triple ? arch_triple : "<NULL>");
 444
 445   int arg_packet_err;
 446   {
 447     // Scope for the scoped timeout object
 448     process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(
 449         m_gdb_client, std::chrono::seconds(5));
 450     arg_packet_err = m_gdb_client.SendArgumentsPacket(launch_info);
 451   }
 452
 453   if (arg_packet_err == 0) {
 454     std::string error_str;
 455     if (m_gdb_client.GetLaunchSuccess(error_str)) {
 456       const auto pid = m_gdb_client.GetCurrentProcessID(false);
 457       if (pid != LLDB_INVALID_PROCESS_ID) {
 458         launch_info.SetProcessID(pid);
 459         if (log)
 460           log->Printf("PlatformRemoteGDBServer::%s() pid %" PRIu64
 461                       " launched successfully",
 462                       __FUNCTION__, pid);
 463       } else {
 464         if (log)
 465           log->Printf("PlatformRemoteGDBServer::%s() launch succeeded but we "
 466                       "didn't get a valid process id back!",
 467                       __FUNCTION__);
 468         error.SetErrorString("failed to get PID");
 469       }
 470     } else {
 471       error.SetErrorString(error_str.c_str());
 472       if (log)
 473         log->Printf("PlatformRemoteGDBServer::%s() launch failed: %s",
 474                     __FUNCTION__, error.AsCString());
 475     }
 476   } else {
 477     error.SetErrorStringWithFormat("'A' packet returned an error: %i",
 478                                    arg_packet_err);
 479   }
 480   return error;
 481 }
 482
 483 Status PlatformRemoteGDBServer::KillProcess(const lldb::pid_t pid) {
 484   if (!KillSpawnedProcess(pid))
 485     return Status("failed to kill remote spawned process");
 486   return Status();
 487 }
 488
 489 lldb::ProcessSP PlatformRemoteGDBServer::DebugProcess(
 490     ProcessLaunchInfo &launch_info, Debugger &debugger,
 491     Target *target, // Can be NULL, if NULL create a new target, else use
 492                     // existing one
 493     Status &error) {
 494   lldb::ProcessSP process_sp;
 495   if (IsRemote()) {
 496     if (IsConnected()) {
 497       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 498       std::string connect_url;
 499       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 500         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 501                                        GetHostname());
 502       } else {
 503         if (target == NULL) {
 504           TargetSP new_target_sp;
 505
 506           error = debugger.GetTargetList().CreateTarget(debugger, "", "", false,
 507                                                         NULL, new_target_sp);
 508           target = new_target_sp.get();
 509         } else
 510           error.Clear();
 511
 512         if (target && error.Success()) {
 513           debugger.GetTargetList().SetSelectedTarget(target);
 514
 515           // The darwin always currently uses the GDB remote debugger plug-in
 516           // so even when debugging locally we are debugging remotely!
 517           process_sp = target->CreateProcess(
 518               launch_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
 519
 520           if (process_sp) {
 521             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 522             // Retry the connect remote one time...
 523             if (error.Fail())
 524               error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 525             if (error.Success())
 526               error = process_sp->Launch(launch_info);
 527             else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 528               printf("error: connect remote failed (%s)\n", error.AsCString());
 529               KillSpawnedProcess(debugserver_pid);
 530             }
 531           }
 532         }
 533       }
 534     } else {
 535       error.SetErrorString("not connected to remote gdb server");
 536     }
 537   }
 538   return process_sp;
 539 }
 540
 541 bool PlatformRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,
 542                                               std::string &connect_url) {
 543   ArchSpec remote_arch = GetRemoteSystemArchitecture();
 544   llvm::Triple &remote_triple = remote_arch.GetTriple();
 545
 546   uint16_t port = 0;
 547   std::string socket_name;
 548   bool launch_result = false;
 549   if (remote_triple.getVendor() == llvm::Triple::Apple &&
 550       remote_triple.getOS() == llvm::Triple::IOS) {
 551     // When remote debugging to iOS, we use a USB mux that always talks
 552     // to localhost, so we will need the remote debugserver to accept
 553     // connections
 554     // only from localhost, no matter what our current hostname is
 555     launch_result =
 556         m_gdb_client.LaunchGDBServer("127.0.0.1", pid, port, socket_name);
 557   } else {
 558     // All other hosts should use their actual hostname
 559     launch_result =
 560         m_gdb_client.LaunchGDBServer(nullptr, pid, port, socket_name);
 561   }
 562
 563   if (!launch_result)
 564     return false;
 565
 566   connect_url =
 567       MakeGdbServerUrl(m_platform_scheme, m_platform_hostname, port,
 568                        (socket_name.empty()) ? nullptr : socket_name.c_str());
 569   return true;
 570 }
 571
 572 bool PlatformRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {
 573   return m_gdb_client.KillSpawnedProcess(pid);
 574 }
 575
 576 lldb::ProcessSP PlatformRemoteGDBServer::Attach(
 577     ProcessAttachInfo &attach_info, Debugger &debugger,
 578     Target *target, // Can be NULL, if NULL create a new target, else use
 579                     // existing one
 580     Status &error) {
 581   lldb::ProcessSP process_sp;
 582   if (IsRemote()) {
 583     if (IsConnected()) {
 584       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 585       std::string connect_url;
 586       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 587         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 588                                        GetHostname());
 589       } else {
 590         if (target == NULL) {
 591           TargetSP new_target_sp;
 592
 593           error = debugger.GetTargetList().CreateTarget(debugger, "", "", false,
 594                                                         NULL, new_target_sp);
 595           target = new_target_sp.get();
 596         } else
 597           error.Clear();
 598
 599         if (target && error.Success()) {
 600           debugger.GetTargetList().SetSelectedTarget(target);
 601
 602           // The darwin always currently uses the GDB remote debugger plug-in
 603           // so even when debugging locally we are debugging remotely!
 604           process_sp = target->CreateProcess(
 605               attach_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
 606           if (process_sp) {
 607             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 608             if (error.Success()) {
 609               ListenerSP listener_sp = attach_info.GetHijackListener();
 610               if (listener_sp)
 611                 process_sp->HijackProcessEvents(listener_sp);
 612               error = process_sp->Attach(attach_info);
 613             }
 614
 615             if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 616               KillSpawnedProcess(debugserver_pid);
 617             }
 618           }
 619         }
 620       }
 621     } else {
 622       error.SetErrorString("not connected to remote gdb server");
 623     }
 624   }
 625   return process_sp;
 626 }
 627
 628 Status PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec,
 629                                               uint32_t mode) {
 630   Status error = m_gdb_client.MakeDirectory(file_spec, mode);
 631   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 632   if (log)
 633     log->Printf("PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "
 634                 "error = %u (%s)",
 635                 file_spec.GetCString(), mode, error.GetError(),
 636                 error.AsCString());
 637   return error;
 638 }
 639
 640 Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,
 641                                                    uint32_t &file_permissions) {
 642   Status error = m_gdb_client.GetFilePermissions(file_spec, file_permissions);
 643   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 644   if (log)
 645     log->Printf("PlatformRemoteGDBServer::GetFilePermissions(path='%s', "
 646                 "file_permissions=%o) error = %u (%s)",
 647                 file_spec.GetCString(), file_permissions, error.GetError(),
 648                 error.AsCString());
 649   return error;
 650 }
 651
 652 Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,
 653                                                    uint32_t file_permissions) {
 654   Status error = m_gdb_client.SetFilePermissions(file_spec, file_permissions);
 655   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 656   if (log)
 657     log->Printf("PlatformRemoteGDBServer::SetFilePermissions(path='%s', "
 658                 "file_permissions=%o) error = %u (%s)",
 659                 file_spec.GetCString(), file_permissions, error.GetError(),
 660                 error.AsCString());
 661   return error;
 662 }
 663
 664 lldb::user_id_t PlatformRemoteGDBServer::OpenFile(const FileSpec &file_spec,
 665                                                   uint32_t flags, uint32_t mode,
 666                                                   Status &error) {
 667   return m_gdb_client.OpenFile(file_spec, flags, mode, error);
 668 }
 669
 670 bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {
 671   return m_gdb_client.CloseFile(fd, error);
 672 }
 673
 674 lldb::user_id_t
 675 PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {
 676   return m_gdb_client.GetFileSize(file_spec);
 677 }
 678
 679 uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,
 680                                            void *dst, uint64_t dst_len,
 681                                            Status &error) {
 682   return m_gdb_client.ReadFile(fd, offset, dst, dst_len, error);
 683 }
 684
 685 uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,
 686                                             const void *src, uint64_t src_len,
 687                                             Status &error) {
 688   return m_gdb_client.WriteFile(fd, offset, src, src_len, error);
 689 }
 690
 691 Status PlatformRemoteGDBServer::PutFile(const FileSpec &source,
 692                                         const FileSpec &destination,
 693                                         uint32_t uid, uint32_t gid) {
 694   return Platform::PutFile(source, destination, uid, gid);
 695 }
 696
 697 Status PlatformRemoteGDBServer::CreateSymlink(
 698     const FileSpec &src, // The name of the link is in src
 699     const FileSpec &dst) // The symlink points to dst
 700 {
 701   Status error = m_gdb_client.CreateSymlink(src, dst);
 702   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 703   if (log)
 704     log->Printf("PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "
 705                 "error = %u (%s)",
 706                 src.GetCString(), dst.GetCString(), error.GetError(),
 707                 error.AsCString());
 708   return error;
 709 }
 710
 711 Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
 712   Status error = m_gdb_client.Unlink(file_spec);
 713   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 714   if (log)
 715     log->Printf("PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
 716                 file_spec.GetCString(), error.GetError(), error.AsCString());
 717   return error;
 718 }
 719
 720 bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {
 721   return m_gdb_client.GetFileExists(file_spec);
 722 }
 723
 724 Status PlatformRemoteGDBServer::RunShellCommand(
 725     const char *command, // Shouldn't be NULL
 726     const FileSpec &
 727         working_dir, // Pass empty FileSpec to use the current working directory
 728     int *status_ptr, // Pass NULL if you don't want the process exit status
 729     int *signo_ptr,  // Pass NULL if you don't want the signal that caused the
 730                      // process to exit
 731     std::string
 732         *command_output, // Pass NULL if you don't want the command output
 733     uint32_t
 734         timeout_sec) // Timeout in seconds to wait for shell program to finish
 735 {
 736   return m_gdb_client.RunShellCommand(command, working_dir, status_ptr,
 737                                       signo_ptr, command_output, timeout_sec);
 738 }
 739
 740 void PlatformRemoteGDBServer::CalculateTrapHandlerSymbolNames() {
 741   m_trap_handlers.push_back(ConstString("_sigtramp"));
 742 }
 743
 744 const UnixSignalsSP &PlatformRemoteGDBServer::GetRemoteUnixSignals() {
 745   if (!IsConnected())
 746     return Platform::GetRemoteUnixSignals();
 747
 748   if (m_remote_signals_sp)
 749     return m_remote_signals_sp;
 750
 751   // If packet not implemented or JSON failed to parse,
 752   // we'll guess the signal set based on the remote architecture.
 753   m_remote_signals_sp = UnixSignals::Create(GetRemoteSystemArchitecture());
 754
 755   StringExtractorGDBRemote response;
 756   auto result = m_gdb_client.SendPacketAndWaitForResponse("jSignalsInfo",
 757                                                           response, false);
 758
 759   if (result != decltype(result)::Success ||
 760       response.GetResponseType() != response.eResponse)
 761     return m_remote_signals_sp;
 762
 763   auto object_sp = StructuredData::ParseJSON(response.GetStringRef());
 764   if (!object_sp || !object_sp->IsValid())
 765     return m_remote_signals_sp;
 766
 767   auto array_sp = object_sp->GetAsArray();
 768   if (!array_sp || !array_sp->IsValid())
 769     return m_remote_signals_sp;
 770
 771   auto remote_signals_sp = std::make_shared<lldb_private::GDBRemoteSignals>();
 772
 773   bool done = array_sp->ForEach(
 774       [&remote_signals_sp](StructuredData::Object *object) -> bool {
 775         if (!object || !object->IsValid())
 776           return false;
 777
 778         auto dict = object->GetAsDictionary();
 779         if (!dict || !dict->IsValid())
 780           return false;
 781
 782         // Signal number and signal name are required.
 783         int signo;
 784         if (!dict->GetValueForKeyAsInteger("signo", signo))
 785           return false;
 786
 787         llvm::StringRef name;
 788         if (!dict->GetValueForKeyAsString("name", name))
 789           return false;
 790
 791         // We can live without short_name, description, etc.
 792         bool suppress{false};
 793         auto object_sp = dict->GetValueForKey("suppress");
 794         if (object_sp && object_sp->IsValid())
 795           suppress = object_sp->GetBooleanValue();
 796
 797         bool stop{false};
 798         object_sp = dict->GetValueForKey("stop");
 799         if (object_sp && object_sp->IsValid())
 800           stop = object_sp->GetBooleanValue();
 801
 802         bool notify{false};
 803         object_sp = dict->GetValueForKey("notify");
 804         if (object_sp && object_sp->IsValid())
 805           notify = object_sp->GetBooleanValue();
 806
 807         std::string description{""};
 808         object_sp = dict->GetValueForKey("description");
 809         if (object_sp && object_sp->IsValid())
 810           description = object_sp->GetStringValue();
 811
 812         remote_signals_sp->AddSignal(signo, name.str().c_str(), suppress, stop,
 813                                      notify, description.c_str());
 814         return true;
 815       });
 816
 817   if (done)
 818     m_remote_signals_sp = std::move(remote_signals_sp);
 819
 820   return m_remote_signals_sp;
 821 }
 822
 823 std::string PlatformRemoteGDBServer::MakeGdbServerUrl(
 824     const std::string &platform_scheme, const std::string &platform_hostname,
 825     uint16_t port, const char *socket_name) {
 826   const char *override_scheme =
 827       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_SCHEME");
 828   const char *override_hostname =
 829       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_HOSTNAME");
 830   const char *port_offset_c_str =
 831       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_PORT_OFFSET");
 832   int port_offset = port_offset_c_str ? ::atoi(port_offset_c_str) : 0;
 833
 834   return MakeUrl(override_scheme ? override_scheme : platform_scheme.c_str(),
 835                  override_hostname ? override_hostname
 836                                    : platform_hostname.c_str(),
 837                  port + port_offset, socket_name);
 838 }
 839
 840 std::string PlatformRemoteGDBServer::MakeUrl(const char *scheme,
 841                                              const char *hostname,
 842                                              uint16_t port, const char *path) {
 843   StreamString result;
 844   result.Printf("%s://%s", scheme, hostname);
 845   if (port != 0)
 846     result.Printf(":%u", port);
 847   if (path)
 848     result.Write(path, strlen(path));
 849   return result.GetString();
 850 }
 851
 852 lldb::ProcessSP PlatformRemoteGDBServer::ConnectProcess(
 853     llvm::StringRef connect_url, llvm::StringRef plugin_name,
 854     lldb_private::Debugger &debugger, lldb_private::Target *target,
 855     lldb_private::Status &error) {
 856   if (!IsRemote() || !IsConnected()) {
 857     error.SetErrorString("Not connected to remote gdb server");
 858     return nullptr;
 859   }
 860   return Platform::ConnectProcess(connect_url, plugin_name, debugger, target,
 861                                   error);
 862 }
 863
 864 size_t PlatformRemoteGDBServer::ConnectToWaitingProcesses(Debugger &debugger,
 865                                                           Status &error) {
 866   std::vector<std::string> connection_urls;
 867   GetPendingGdbServerList(connection_urls);
 868
 869   for (size_t i = 0; i < connection_urls.size(); ++i) {
 870     ConnectProcess(connection_urls[i].c_str(), "", debugger, nullptr, error);
 871     if (error.Fail())
 872       return i; // We already connected to i process succsessfully
 873   }
 874   return connection_urls.size();
 875 }
 876
 877 size_t PlatformRemoteGDBServer::GetPendingGdbServerList(
 878     std::vector<std::string> &connection_urls) {
 879   std::vector<std::pair<uint16_t, std::string>> remote_servers;
 880   m_gdb_client.QueryGDBServer(remote_servers);
 881   for (const auto &gdbserver : remote_servers) {
 882     const char *socket_name_cstr =
 883         gdbserver.second.empty() ? nullptr : gdbserver.second.c_str();
 884     connection_urls.emplace_back(
 885         MakeGdbServerUrl(m_platform_scheme, m_platform_hostname,
 886                          gdbserver.first, socket_name_cstr));
 887   }
 888   return connection_urls.size();
 889 }