contrib/llvm/tools/lldb/source/Target/TargetList.cpp

   1 //===-- TargetList.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 // Project includes
  11 #include "lldb/Target/TargetList.h"
  12 #include "lldb/Core/Broadcaster.h"
  13 #include "lldb/Core/Debugger.h"
  14 #include "lldb/Core/Event.h"
  15 #include "lldb/Core/Module.h"
  16 #include "lldb/Core/ModuleSpec.h"
  17 #include "lldb/Core/State.h"
  18 #include "lldb/Host/Host.h"
  19 #include "lldb/Host/HostInfo.h"
  20 #include "lldb/Interpreter/CommandInterpreter.h"
  21 #include "lldb/Interpreter/OptionGroupPlatform.h"
  22 #include "lldb/Symbol/ObjectFile.h"
  23 #include "lldb/Target/Platform.h"
  24 #include "lldb/Target/Process.h"
  25 #include "lldb/Utility/TildeExpressionResolver.h"
  26 #include "lldb/Utility/Timer.h"
  27
  28 // Other libraries and framework includes
  29 #include "llvm/ADT/SmallString.h"
  30 #include "llvm/Support/FileSystem.h"
  31
  32 using namespace lldb;
  33 using namespace lldb_private;
  34
  35 ConstString &TargetList::GetStaticBroadcasterClass() {
  36   static ConstString class_name("lldb.targetList");
  37   return class_name;
  38 }
  39
  40 //----------------------------------------------------------------------
  41 // TargetList constructor
  42 //----------------------------------------------------------------------
  43 TargetList::TargetList(Debugger &debugger)
  44     : Broadcaster(debugger.GetBroadcasterManager(),
  45                   TargetList::GetStaticBroadcasterClass().AsCString()),
  46       m_target_list(), m_target_list_mutex(), m_selected_target_idx(0) {
  47   CheckInWithManager();
  48 }
  49
  50 //----------------------------------------------------------------------
  51 // Destructor
  52 //----------------------------------------------------------------------
  53 TargetList::~TargetList() {
  54   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
  55   m_target_list.clear();
  56 }
  57
  58 Status TargetList::CreateTarget(Debugger &debugger,
  59                                 llvm::StringRef user_exe_path,
  60                                 llvm::StringRef triple_str,
  61                                 bool get_dependent_files,
  62                                 const OptionGroupPlatform *platform_options,
  63                                 TargetSP &target_sp) {
  64   return CreateTargetInternal(debugger, user_exe_path, triple_str,
  65                               get_dependent_files, platform_options, target_sp,
  66                               false);
  67 }
  68
  69 Status TargetList::CreateTarget(Debugger &debugger,
  70                                 llvm::StringRef user_exe_path,
  71                                 const ArchSpec &specified_arch,
  72                                 bool get_dependent_files,
  73                                 PlatformSP &platform_sp, TargetSP &target_sp) {
  74   return CreateTargetInternal(debugger, user_exe_path, specified_arch,
  75                               get_dependent_files, platform_sp, target_sp,
  76                               false);
  77 }
  78
  79 Status TargetList::CreateTargetInternal(
  80     Debugger &debugger, llvm::StringRef user_exe_path,
  81     llvm::StringRef triple_str, bool get_dependent_files,
  82     const OptionGroupPlatform *platform_options, TargetSP &target_sp,
  83     bool is_dummy_target) {
  84   Status error;
  85   PlatformSP platform_sp;
  86
  87   // This is purposely left empty unless it is specified by triple_cstr.
  88   // If not initialized via triple_cstr, then the currently selected platform
  89   // will set the architecture correctly.
  90   const ArchSpec arch(triple_str);
  91   if (!triple_str.empty()) {
  92     if (!arch.IsValid()) {
  93       error.SetErrorStringWithFormat("invalid triple '%s'",
  94                                      triple_str.str().c_str());
  95       return error;
  96     }
  97   }
  98
  99   ArchSpec platform_arch(arch);
 100
 101   bool prefer_platform_arch = false;
 102
 103   CommandInterpreter &interpreter = debugger.GetCommandInterpreter();
 104
 105   // let's see if there is already an existing plaform before we go creating
 106   // another...
 107   platform_sp = debugger.GetPlatformList().GetSelectedPlatform();
 108
 109   if (platform_options && platform_options->PlatformWasSpecified()) {
 110     // Create a new platform if it doesn't match the selected platform
 111     if (!platform_options->PlatformMatches(platform_sp)) {
 112       const bool select_platform = true;
 113       platform_sp = platform_options->CreatePlatformWithOptions(
 114           interpreter, arch, select_platform, error, platform_arch);
 115       if (!platform_sp)
 116         return error;
 117     }
 118   }
 119
 120   if (!user_exe_path.empty()) {
 121     ModuleSpecList module_specs;
 122     ModuleSpec module_spec;
 123     module_spec.GetFileSpec().SetFile(user_exe_path, true);
 124
 125     // Resolve the executable in case we are given a path to a application
 126     // bundle
 127     // like a .app bundle on MacOSX
 128     Host::ResolveExecutableInBundle(module_spec.GetFileSpec());
 129
 130     lldb::offset_t file_offset = 0;
 131     lldb::offset_t file_size = 0;
 132     const size_t num_specs = ObjectFile::GetModuleSpecifications(
 133         module_spec.GetFileSpec(), file_offset, file_size, module_specs);
 134     if (num_specs > 0) {
 135       ModuleSpec matching_module_spec;
 136
 137       if (num_specs == 1) {
 138         if (module_specs.GetModuleSpecAtIndex(0, matching_module_spec)) {
 139           if (platform_arch.IsValid()) {
 140             if (platform_arch.IsCompatibleMatch(
 141                     matching_module_spec.GetArchitecture())) {
 142               // If the OS or vendor weren't specified, then adopt the module's
 143               // architecture so that the platform matching can be more accurate
 144               if (!platform_arch.TripleOSWasSpecified() ||
 145                   !platform_arch.TripleVendorWasSpecified()) {
 146                 prefer_platform_arch = true;
 147                 platform_arch = matching_module_spec.GetArchitecture();
 148               }
 149             } else {
 150               StreamString platform_arch_strm;
 151               StreamString module_arch_strm;
 152
 153               platform_arch.DumpTriple(platform_arch_strm);
 154               matching_module_spec.GetArchitecture().DumpTriple(
 155                   module_arch_strm);
 156               error.SetErrorStringWithFormat(
 157                   "the specified architecture '%s' is not compatible with '%s' "
 158                   "in '%s'",
 159                   platform_arch_strm.GetData(), module_arch_strm.GetData(),
 160                   module_spec.GetFileSpec().GetPath().c_str());
 161               return error;
 162             }
 163           } else {
 164             // Only one arch and none was specified
 165             prefer_platform_arch = true;
 166             platform_arch = matching_module_spec.GetArchitecture();
 167           }
 168         }
 169       } else {
 170         if (arch.IsValid()) {
 171           module_spec.GetArchitecture() = arch;
 172           if (module_specs.FindMatchingModuleSpec(module_spec,
 173                                                   matching_module_spec)) {
 174             prefer_platform_arch = true;
 175             platform_arch = matching_module_spec.GetArchitecture();
 176           }
 177         } else {
 178           // No architecture specified, check if there is only one platform for
 179           // all of the architectures.
 180
 181           typedef std::vector<PlatformSP> PlatformList;
 182           PlatformList platforms;
 183           PlatformSP host_platform_sp = Platform::GetHostPlatform();
 184           for (size_t i = 0; i < num_specs; ++i) {
 185             ModuleSpec module_spec;
 186             if (module_specs.GetModuleSpecAtIndex(i, module_spec)) {
 187               // See if there was a selected platform and check that first
 188               // since the user may have specified it.
 189               if (platform_sp) {
 190                 if (platform_sp->IsCompatibleArchitecture(
 191                         module_spec.GetArchitecture(), false, nullptr)) {
 192                   platforms.push_back(platform_sp);
 193                   continue;
 194                 }
 195               }
 196
 197               // Next check the host platform it if wasn't already checked above
 198               if (host_platform_sp &&
 199                   (!platform_sp ||
 200                    host_platform_sp->GetName() != platform_sp->GetName())) {
 201                 if (host_platform_sp->IsCompatibleArchitecture(
 202                         module_spec.GetArchitecture(), false, nullptr)) {
 203                   platforms.push_back(host_platform_sp);
 204                   continue;
 205                 }
 206               }
 207
 208               // Just find a platform that matches the architecture in the
 209               // executable file
 210               PlatformSP fallback_platform_sp(
 211                   Platform::GetPlatformForArchitecture(
 212                       module_spec.GetArchitecture(), nullptr));
 213               if (fallback_platform_sp) {
 214                 platforms.push_back(fallback_platform_sp);
 215               }
 216             }
 217           }
 218
 219           Platform *platform_ptr = nullptr;
 220           bool more_than_one_platforms = false;
 221           for (const auto &the_platform_sp : platforms) {
 222             if (platform_ptr) {
 223               if (platform_ptr->GetName() != the_platform_sp->GetName()) {
 224                 more_than_one_platforms = true;
 225                 platform_ptr = nullptr;
 226                 break;
 227               }
 228             } else {
 229               platform_ptr = the_platform_sp.get();
 230             }
 231           }
 232
 233           if (platform_ptr) {
 234             // All platforms for all modules in the exectuable match, so we can
 235             // select this platform
 236             platform_sp = platforms.front();
 237           } else if (more_than_one_platforms == false) {
 238             // No platforms claim to support this file
 239             error.SetErrorString("No matching platforms found for this file, "
 240                                  "specify one with the --platform option");
 241             return error;
 242           } else {
 243             // More than one platform claims to support this file, so the
 244             // --platform option must be specified
 245             StreamString error_strm;
 246             std::set<Platform *> platform_set;
 247             error_strm.Printf(
 248                 "more than one platform supports this executable (");
 249             for (const auto &the_platform_sp : platforms) {
 250               if (platform_set.find(the_platform_sp.get()) ==
 251                   platform_set.end()) {
 252                 if (!platform_set.empty())
 253                   error_strm.PutCString(", ");
 254                 error_strm.PutCString(the_platform_sp->GetName().GetCString());
 255                 platform_set.insert(the_platform_sp.get());
 256               }
 257             }
 258             error_strm.Printf(
 259                 "), use the --platform option to specify a platform");
 260             error.SetErrorString(error_strm.GetString());
 261             return error;
 262           }
 263         }
 264       }
 265     }
 266   }
 267
 268   // If we have a valid architecture, make sure the current platform is
 269   // compatible with that architecture
 270   if (!prefer_platform_arch && arch.IsValid()) {
 271     if (!platform_sp->IsCompatibleArchitecture(arch, false, &platform_arch)) {
 272       platform_sp = Platform::GetPlatformForArchitecture(arch, &platform_arch);
 273       if (!is_dummy_target && platform_sp)
 274         debugger.GetPlatformList().SetSelectedPlatform(platform_sp);
 275     }
 276   } else if (platform_arch.IsValid()) {
 277     // if "arch" isn't valid, yet "platform_arch" is, it means we have an
 278     // executable file with
 279     // a single architecture which should be used
 280     ArchSpec fixed_platform_arch;
 281     if (!platform_sp->IsCompatibleArchitecture(platform_arch, false,
 282                                                &fixed_platform_arch)) {
 283       platform_sp = Platform::GetPlatformForArchitecture(platform_arch,
 284                                                          &fixed_platform_arch);
 285       if (!is_dummy_target && platform_sp)
 286         debugger.GetPlatformList().SetSelectedPlatform(platform_sp);
 287     }
 288   }
 289
 290   if (!platform_arch.IsValid())
 291     platform_arch = arch;
 292
 293   error = TargetList::CreateTargetInternal(
 294       debugger, user_exe_path, platform_arch, get_dependent_files, platform_sp,
 295       target_sp, is_dummy_target);
 296   return error;
 297 }
 298
 299 lldb::TargetSP TargetList::GetDummyTarget(lldb_private::Debugger &debugger) {
 300   // FIXME: Maybe the dummy target should be per-Debugger
 301   if (!m_dummy_target_sp || !m_dummy_target_sp->IsValid()) {
 302     ArchSpec arch(Target::GetDefaultArchitecture());
 303     if (!arch.IsValid())
 304       arch = HostInfo::GetArchitecture();
 305     Status err = CreateDummyTarget(
 306         debugger, arch.GetTriple().getTriple().c_str(), m_dummy_target_sp);
 307   }
 308
 309   return m_dummy_target_sp;
 310 }
 311
 312 Status TargetList::CreateDummyTarget(Debugger &debugger,
 313                                      llvm::StringRef specified_arch_name,
 314                                      lldb::TargetSP &target_sp) {
 315   PlatformSP host_platform_sp(Platform::GetHostPlatform());
 316   return CreateTargetInternal(
 317       debugger, (const char *)nullptr, specified_arch_name, false,
 318       (const OptionGroupPlatform *)nullptr, target_sp, true);
 319 }
 320
 321 Status TargetList::CreateTargetInternal(Debugger &debugger,
 322                                         llvm::StringRef user_exe_path,
 323                                         const ArchSpec &specified_arch,
 324                                         bool get_dependent_files,
 325                                         lldb::PlatformSP &platform_sp,
 326                                         lldb::TargetSP &target_sp,
 327                                         bool is_dummy_target) {
 328   static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
 329   Timer scoped_timer(
 330       func_cat, "TargetList::CreateTarget (file = '%s', arch = '%s')",
 331       user_exe_path.str().c_str(), specified_arch.GetArchitectureName());
 332   Status error;
 333
 334   ArchSpec arch(specified_arch);
 335
 336   if (arch.IsValid()) {
 337     if (!platform_sp ||
 338         !platform_sp->IsCompatibleArchitecture(arch, false, nullptr))
 339       platform_sp = Platform::GetPlatformForArchitecture(specified_arch, &arch);
 340   }
 341
 342   if (!platform_sp)
 343     platform_sp = debugger.GetPlatformList().GetSelectedPlatform();
 344
 345   if (!arch.IsValid())
 346     arch = specified_arch;
 347
 348   FileSpec file(user_exe_path, false);
 349   if (!file.Exists() && user_exe_path.startswith("~")) {
 350     // we want to expand the tilde but we don't want to resolve any symbolic
 351     // links so we can't use the FileSpec constructor's resolve flag
 352     llvm::SmallString<64> unglobbed_path;
 353     StandardTildeExpressionResolver Resolver;
 354     Resolver.ResolveFullPath(user_exe_path, unglobbed_path);
 355
 356     if (unglobbed_path.empty())
 357       file = FileSpec(user_exe_path, false);
 358     else
 359       file = FileSpec(unglobbed_path.c_str(), false);
 360   }
 361
 362   bool user_exe_path_is_bundle = false;
 363   char resolved_bundle_exe_path[PATH_MAX];
 364   resolved_bundle_exe_path[0] = '\0';
 365   if (file) {
 366     if (llvm::sys::fs::is_directory(file.GetPath()))
 367       user_exe_path_is_bundle = true;
 368
 369     if (file.IsRelative() && !user_exe_path.empty()) {
 370       // Ignore paths that start with "./" and "../"
 371       if (!user_exe_path.startswith("./") && !user_exe_path.startswith("../")) {
 372         llvm::SmallString<64> cwd;
 373         if (! llvm::sys::fs::current_path(cwd)) {
 374           cwd += '/';
 375           cwd += user_exe_path;
 376           FileSpec cwd_file(cwd, false);
 377           if (cwd_file.Exists())
 378             file = cwd_file;
 379         }
 380       }
 381     }
 382
 383     ModuleSP exe_module_sp;
 384     if (platform_sp) {
 385       FileSpecList executable_search_paths(
 386           Target::GetDefaultExecutableSearchPaths());
 387       ModuleSpec module_spec(file, arch);
 388       error = platform_sp->ResolveExecutable(module_spec, exe_module_sp,
 389                                              executable_search_paths.GetSize()
 390                                                  ? &executable_search_paths
 391                                                  : nullptr);
 392     }
 393
 394     if (error.Success() && exe_module_sp) {
 395       if (exe_module_sp->GetObjectFile() == nullptr) {
 396         if (arch.IsValid()) {
 397           error.SetErrorStringWithFormat(
 398               "\"%s\" doesn't contain architecture %s", file.GetPath().c_str(),
 399               arch.GetArchitectureName());
 400         } else {
 401           error.SetErrorStringWithFormat("unsupported file type \"%s\"",
 402                                          file.GetPath().c_str());
 403         }
 404         return error;
 405       }
 406       target_sp.reset(new Target(debugger, arch, platform_sp, is_dummy_target));
 407       target_sp->SetExecutableModule(exe_module_sp, get_dependent_files);
 408       if (user_exe_path_is_bundle)
 409         exe_module_sp->GetFileSpec().GetPath(resolved_bundle_exe_path,
 410                                              sizeof(resolved_bundle_exe_path));
 411     }
 412   } else {
 413     // No file was specified, just create an empty target with any arch
 414     // if a valid arch was specified
 415     target_sp.reset(new Target(debugger, arch, platform_sp, is_dummy_target));
 416   }
 417
 418   if (target_sp) {
 419     // Set argv0 with what the user typed, unless the user specified a
 420     // directory. If the user specified a directory, then it is probably a
 421     // bundle that was resolved and we need to use the resolved bundle path
 422     if (!user_exe_path.empty()) {
 423       // Use exactly what the user typed as the first argument when we exec or
 424       // posix_spawn
 425       if (user_exe_path_is_bundle && resolved_bundle_exe_path[0]) {
 426         target_sp->SetArg0(resolved_bundle_exe_path);
 427       } else {
 428         // Use resolved path
 429         target_sp->SetArg0(file.GetPath().c_str());
 430       }
 431     }
 432     if (file.GetDirectory()) {
 433       FileSpec file_dir;
 434       file_dir.GetDirectory() = file.GetDirectory();
 435       target_sp->GetExecutableSearchPaths().Append(file_dir);
 436     }
 437
 438     // Don't put the dummy target in the target list, it's held separately.
 439     if (!is_dummy_target) {
 440       std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 441       m_selected_target_idx = m_target_list.size();
 442       m_target_list.push_back(target_sp);
 443       // Now prime this from the dummy target:
 444       target_sp->PrimeFromDummyTarget(debugger.GetDummyTarget());
 445     } else {
 446       m_dummy_target_sp = target_sp;
 447     }
 448   }
 449
 450   return error;
 451 }
 452
 453 bool TargetList::DeleteTarget(TargetSP &target_sp) {
 454   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 455   collection::iterator pos, end = m_target_list.end();
 456
 457   for (pos = m_target_list.begin(); pos != end; ++pos) {
 458     if (pos->get() == target_sp.get()) {
 459       m_target_list.erase(pos);
 460       return true;
 461     }
 462   }
 463   return false;
 464 }
 465
 466 TargetSP TargetList::FindTargetWithExecutableAndArchitecture(
 467     const FileSpec &exe_file_spec, const ArchSpec *exe_arch_ptr) const {
 468   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 469   TargetSP target_sp;
 470   bool full_match = (bool)exe_file_spec.GetDirectory();
 471
 472   collection::const_iterator pos, end = m_target_list.end();
 473   for (pos = m_target_list.begin(); pos != end; ++pos) {
 474     Module *exe_module = (*pos)->GetExecutableModulePointer();
 475
 476     if (exe_module) {
 477       if (FileSpec::Equal(exe_file_spec, exe_module->GetFileSpec(),
 478                           full_match)) {
 479         if (exe_arch_ptr) {
 480           if (!exe_arch_ptr->IsCompatibleMatch(exe_module->GetArchitecture()))
 481             continue;
 482         }
 483         target_sp = *pos;
 484         break;
 485       }
 486     }
 487   }
 488   return target_sp;
 489 }
 490
 491 TargetSP TargetList::FindTargetWithProcessID(lldb::pid_t pid) const {
 492   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 493   TargetSP target_sp;
 494   collection::const_iterator pos, end = m_target_list.end();
 495   for (pos = m_target_list.begin(); pos != end; ++pos) {
 496     Process *process = (*pos)->GetProcessSP().get();
 497     if (process && process->GetID() == pid) {
 498       target_sp = *pos;
 499       break;
 500     }
 501   }
 502   return target_sp;
 503 }
 504
 505 TargetSP TargetList::FindTargetWithProcess(Process *process) const {
 506   TargetSP target_sp;
 507   if (process) {
 508     std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 509     collection::const_iterator pos, end = m_target_list.end();
 510     for (pos = m_target_list.begin(); pos != end; ++pos) {
 511       if (process == (*pos)->GetProcessSP().get()) {
 512         target_sp = *pos;
 513         break;
 514       }
 515     }
 516   }
 517   return target_sp;
 518 }
 519
 520 TargetSP TargetList::GetTargetSP(Target *target) const {
 521   TargetSP target_sp;
 522   if (target) {
 523     std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 524     collection::const_iterator pos, end = m_target_list.end();
 525     for (pos = m_target_list.begin(); pos != end; ++pos) {
 526       if (target == (*pos).get()) {
 527         target_sp = *pos;
 528         break;
 529       }
 530     }
 531   }
 532   return target_sp;
 533 }
 534
 535 uint32_t TargetList::SendAsyncInterrupt(lldb::pid_t pid) {
 536   uint32_t num_async_interrupts_sent = 0;
 537
 538   if (pid != LLDB_INVALID_PROCESS_ID) {
 539     TargetSP target_sp(FindTargetWithProcessID(pid));
 540     if (target_sp) {
 541       Process *process = target_sp->GetProcessSP().get();
 542       if (process) {
 543         process->SendAsyncInterrupt();
 544         ++num_async_interrupts_sent;
 545       }
 546     }
 547   } else {
 548     // We don't have a valid pid to broadcast to, so broadcast to the target
 549     // list's async broadcaster...
 550     BroadcastEvent(Process::eBroadcastBitInterrupt, nullptr);
 551   }
 552
 553   return num_async_interrupts_sent;
 554 }
 555
 556 uint32_t TargetList::SignalIfRunning(lldb::pid_t pid, int signo) {
 557   uint32_t num_signals_sent = 0;
 558   Process *process = nullptr;
 559   if (pid == LLDB_INVALID_PROCESS_ID) {
 560     // Signal all processes with signal
 561     std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 562     collection::iterator pos, end = m_target_list.end();
 563     for (pos = m_target_list.begin(); pos != end; ++pos) {
 564       process = (*pos)->GetProcessSP().get();
 565       if (process) {
 566         if (process->IsAlive()) {
 567           ++num_signals_sent;
 568           process->Signal(signo);
 569         }
 570       }
 571     }
 572   } else {
 573     // Signal a specific process with signal
 574     TargetSP target_sp(FindTargetWithProcessID(pid));
 575     if (target_sp) {
 576       process = target_sp->GetProcessSP().get();
 577       if (process) {
 578         if (process->IsAlive()) {
 579           ++num_signals_sent;
 580           process->Signal(signo);
 581         }
 582       }
 583     }
 584   }
 585   return num_signals_sent;
 586 }
 587
 588 int TargetList::GetNumTargets() const {
 589   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 590   return m_target_list.size();
 591 }
 592
 593 lldb::TargetSP TargetList::GetTargetAtIndex(uint32_t idx) const {
 594   TargetSP target_sp;
 595   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 596   if (idx < m_target_list.size())
 597     target_sp = m_target_list[idx];
 598   return target_sp;
 599 }
 600
 601 uint32_t TargetList::GetIndexOfTarget(lldb::TargetSP target_sp) const {
 602   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 603   size_t num_targets = m_target_list.size();
 604   for (size_t idx = 0; idx < num_targets; idx++) {
 605     if (target_sp == m_target_list[idx])
 606       return idx;
 607   }
 608   return UINT32_MAX;
 609 }
 610
 611 uint32_t TargetList::SetSelectedTarget(Target *target) {
 612   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 613   collection::const_iterator pos, begin = m_target_list.begin(),
 614                                   end = m_target_list.end();
 615   for (pos = begin; pos != end; ++pos) {
 616     if (pos->get() == target) {
 617       m_selected_target_idx = std::distance(begin, pos);
 618       return m_selected_target_idx;
 619     }
 620   }
 621   m_selected_target_idx = 0;
 622   return m_selected_target_idx;
 623 }
 624
 625 lldb::TargetSP TargetList::GetSelectedTarget() {
 626   std::lock_guard<std::recursive_mutex> guard(m_target_list_mutex);
 627   if (m_selected_target_idx >= m_target_list.size())
 628     m_selected_target_idx = 0;
 629   return GetTargetAtIndex(m_selected_target_idx);
 630 }