vendor/lldb/lldb-trunk-r290819

1 files changed, 698 insertions, 0 deletions

diff --git a/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp b/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp
new file mode 100644
index 0000000000000..aa9b041576587
--- /dev/null
+++ b/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp
@@ -0,0 +1,698 @@
+//===-- NativeThreadListDarwin.cpp ------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 6/19/07.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadListDarwin.h"
+
+// C includes
+#include <inttypes.h>
+#include <mach/vm_map.h>
+#include <sys/sysctl.h>
+
+// LLDB includes
+#include "lldb/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Stream.h"
+#include "lldb/lldb-enumerations.h"
+
+#include "NativeProcessDarwin.h"
+#include "NativeThreadDarwin.h"
+
+using namespace lldb;
+using namespace lldb_private;
+using namespace lldb_private::process_darwin;
+
+NativeThreadListDarwin::NativeThreadListDarwin()
+    : m_threads(), m_threads_mutex(), m_is_64_bit(false) {}
+
+NativeThreadListDarwin::~NativeThreadListDarwin() {}
+
+// These methods will be accessed directly from NativeThreadDarwin
+#if 0
+nub_state_t
+NativeThreadListDarwin::GetState(nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetState();
+    return eStateInvalid;
+}
+
+const char *
+NativeThreadListDarwin::GetName (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetName();
+    return NULL;
+}
+#endif
+
+// TODO: figure out if we need to add this to NativeThreadDarwin yet.
+#if 0
+ThreadInfo::QoS
+NativeThreadListDarwin::GetRequestedQoS (nub_thread_t tid, nub_addr_t tsd, uint64_t dti_qos_class_index)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRequestedQoS(tsd, dti_qos_class_index);
+    return ThreadInfo::QoS();
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetPThreadT (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetPThreadT();
+    return INVALID_NUB_ADDRESS;
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetDispatchQueueT (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetDispatchQueueT();
+    return INVALID_NUB_ADDRESS;
+}
+
+nub_addr_t
+NativeThreadListDarwin::GetTSDAddressForThread (nub_thread_t tid, uint64_t plo_pthread_tsd_base_address_offset, uint64_t plo_pthread_tsd_base_offset, uint64_t plo_pthread_tsd_entry_size)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetTSDAddressForThread(plo_pthread_tsd_base_address_offset, plo_pthread_tsd_base_offset, plo_pthread_tsd_entry_size);
+    return INVALID_NUB_ADDRESS;
+}
+#endif
+
+// TODO implement these
+#if 0
+nub_thread_t
+NativeThreadListDarwin::SetCurrentThread(nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+    {
+        m_current_thread = thread_sp;
+        return tid;
+    }
+    return INVALID_NUB_THREAD;
+}
+
+
+bool
+NativeThreadListDarwin::GetThreadStoppedReason(nub_thread_t tid, struct DNBThreadStopInfo *stop_info) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetStopException().GetStopInfo(stop_info);
+    return false;
+}
+
+bool
+NativeThreadListDarwin::GetIdentifierInfo (nub_thread_t tid, thread_identifier_info_data_t *ident_info)
+{
+    thread_t mach_port_number = GetMachPortNumberByThreadID (tid);
+
+    mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
+    return ::thread_info (mach_port_number, THREAD_IDENTIFIER_INFO, (thread_info_t)ident_info, &count) == KERN_SUCCESS;
+}
+
+void
+NativeThreadListDarwin::DumpThreadStoppedReason (nub_thread_t tid) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        thread_sp->GetStopException().DumpStopReason();
+}
+
+const char *
+NativeThreadListDarwin::GetThreadInfo (nub_thread_t tid) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetBasicInfoAsString();
+    return NULL;
+}
+
+#endif
+
+NativeThreadDarwinSP
+NativeThreadListDarwin::GetThreadByID(lldb::tid_t tid) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetID() == tid))
+      return thread_sp;
+  }
+  return NativeThreadDarwinSP();
+}
+
+NativeThreadDarwinSP NativeThreadListDarwin::GetThreadByMachPortNumber(
+    ::thread_t mach_port_number) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetMachPortNumber() == mach_port_number))
+      return thread_sp;
+  }
+  return NativeThreadDarwinSP();
+}
+
+lldb::tid_t NativeThreadListDarwin::GetThreadIDByMachPortNumber(
+    ::thread_t mach_port_number) const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && (thread_sp->GetMachPortNumber() == mach_port_number))
+      return thread_sp->GetID();
+  }
+  return LLDB_INVALID_THREAD_ID;
+}
+
+// TODO implement
+#if 0
+thread_t
+NativeThreadListDarwin::GetMachPortNumberByThreadID (nub_thread_t globally_unique_id) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    MachThreadSP thread_sp;
+    const size_t num_threads = m_threads.size();
+    for (size_t idx = 0; idx < num_threads; ++idx)
+    {
+        if (m_threads[idx]->ThreadID() == globally_unique_id)
+        {
+            return m_threads[idx]->MachPortNumber();
+        }
+    }
+    return 0;
+}
+
+bool
+NativeThreadListDarwin::GetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, DNBRegisterValue *reg_value ) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRegisterValue(set, reg, reg_value);
+
+    return false;
+}
+
+bool
+NativeThreadListDarwin::SetRegisterValue (nub_thread_t tid, uint32_t set, uint32_t reg, const DNBRegisterValue *reg_value ) const
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SetRegisterValue(set, reg, reg_value);
+
+    return false;
+}
+
+nub_size_t
+NativeThreadListDarwin::GetRegisterContext (nub_thread_t tid, void *buf, size_t buf_len)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->GetRegisterContext (buf, buf_len);
+    return 0;
+}
+
+nub_size_t
+NativeThreadListDarwin::SetRegisterContext (nub_thread_t tid, const void *buf, size_t buf_len)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SetRegisterContext (buf, buf_len);
+    return 0;
+}
+
+uint32_t
+NativeThreadListDarwin::SaveRegisterState (nub_thread_t tid)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->SaveRegisterState ();
+    return 0;
+}
+
+bool
+NativeThreadListDarwin::RestoreRegisterState (nub_thread_t tid, uint32_t save_id)
+{
+    MachThreadSP thread_sp (GetThreadByID (tid));
+    if (thread_sp)
+        return thread_sp->RestoreRegisterState (save_id);
+    return 0;
+}
+#endif
+
+size_t NativeThreadListDarwin::GetNumberOfThreads() const {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  return static_cast<size_t>(m_threads.size());
+}
+
+// TODO implement
+#if 0
+nub_thread_t
+NativeThreadListDarwin::ThreadIDAtIndex (nub_size_t idx) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    if (idx < m_threads.size())
+        return m_threads[idx]->ThreadID();
+    return INVALID_NUB_THREAD;
+}
+
+nub_thread_t
+NativeThreadListDarwin::CurrentThreadID ( )
+{
+    MachThreadSP thread_sp;
+    CurrentThread(thread_sp);
+    if (thread_sp.get())
+        return thread_sp->ThreadID();
+    return INVALID_NUB_THREAD;
+}
+
+#endif
+
+bool NativeThreadListDarwin::NotifyException(MachException::Data &exc) {
+  auto thread_sp = GetThreadByMachPortNumber(exc.thread_port);
+  if (thread_sp) {
+    thread_sp->NotifyException(exc);
+    return true;
+  }
+  return false;
+}
+
+void NativeThreadListDarwin::Clear() {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  m_threads.clear();
+}
+
+uint32_t NativeThreadListDarwin::UpdateThreadList(NativeProcessDarwin &process,
+                                                  bool update,
+                                                  collection *new_threads) {
+  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_THREAD));
+
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  if (log)
+    log->Printf("NativeThreadListDarwin::%s() (pid = %" PRIu64 ", update = "
+                "%u) process stop count = %u",
+                __FUNCTION__, process.GetID(), update, process.GetStopID());
+
+  if (process.GetStopID() == 0) {
+    // On our first stop, we'll record details like 32/64 bitness and
+    // select the proper architecture implementation.
+    //
+    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, (int)process.GetID()};
+
+    struct kinfo_proc processInfo;
+    size_t bufsize = sizeof(processInfo);
+    if ((sysctl(mib, (unsigned)(sizeof(mib) / sizeof(int)), &processInfo,
+                &bufsize, NULL, 0) == 0) &&
+        (bufsize > 0)) {
+      if (processInfo.kp_proc.p_flag & P_LP64)
+        m_is_64_bit = true;
+    }
+
+// TODO implement architecture selection and abstraction.
+#if 0
+#if defined(__i386__) || defined(__x86_64__)
+        if (m_is_64_bit)
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_X86_64);
+        else
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_I386);
+#elif defined(__arm__) || defined(__arm64__) || defined(__aarch64__)
+        if (m_is_64_bit)
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_ARM64);
+        else
+            DNBArchProtocol::SetArchitecture(CPU_TYPE_ARM);
+#endif
+#endif
+  }
+
+  if (m_threads.empty() || update) {
+    thread_array_t thread_list = nullptr;
+    mach_msg_type_number_t thread_list_count = 0;
+    task_t task = process.GetTask();
+
+    Error error;
+    auto mach_err = ::task_threads(task, &thread_list, &thread_list_count);
+    error.SetError(mach_err, eErrorTypeMachKernel);
+    if (error.Fail()) {
+      if (log)
+        log->Printf("::task_threads(task = 0x%4.4x, thread_list => %p, "
+                    "thread_list_count => %u) failed: %u (%s)",
+                    task, thread_list, thread_list_count, error.GetError(),
+                    error.AsCString());
+      return 0;
+    }
+
+    if (thread_list_count > 0) {
+      collection currThreads;
+      size_t idx;
+      // Iterator through the current thread list and see which threads
+      // we already have in our list (keep them), which ones we don't
+      // (add them), and which ones are not around anymore (remove them).
+      for (idx = 0; idx < thread_list_count; ++idx) {
+        // Get the Mach thread port.
+        const ::thread_t mach_port_num = thread_list[idx];
+
+        // Get the unique thread id for the mach port number.
+        uint64_t unique_thread_id =
+            NativeThreadDarwin::GetGloballyUniqueThreadIDForMachPortID(
+                mach_port_num);
+
+        // Retrieve the thread if it exists.
+        auto thread_sp = GetThreadByID(unique_thread_id);
+        if (thread_sp) {
+          // We are already tracking it. Keep the existing native
+          // thread instance.
+          currThreads.push_back(thread_sp);
+        } else {
+          // We don't have a native thread instance for this thread.
+          // Create it now.
+          thread_sp.reset(new NativeThreadDarwin(
+              &process, m_is_64_bit, unique_thread_id, mach_port_num));
+
+          // Add the new thread regardless of its is user ready state.
+          // Make sure the thread is ready to be displayed and shown
+          // to users before we add this thread to our list...
+          if (thread_sp->IsUserReady()) {
+            if (new_threads)
+              new_threads->push_back(thread_sp);
+
+            currThreads.push_back(thread_sp);
+          }
+        }
+      }
+
+      m_threads.swap(currThreads);
+      m_current_thread.reset();
+
+      // Free the vm memory given to us by ::task_threads()
+      vm_size_t thread_list_size =
+          (vm_size_t)(thread_list_count * sizeof(::thread_t));
+      ::vm_deallocate(::mach_task_self(), (vm_address_t)thread_list,
+                      thread_list_size);
+    }
+  }
+  return static_cast<uint32_t>(m_threads.size());
+}
+
+// TODO implement
+#if 0
+
+void
+NativeThreadListDarwin::CurrentThread (MachThreadSP& thread_sp)
+{
+    // locker will keep a mutex locked until it goes out of scope
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    if (m_current_thread.get() == NULL)
+    {
+        // Figure out which thread is going to be our current thread.
+        // This is currently done by finding the first thread in the list
+        // that has a valid exception.
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {
+            if (m_threads[idx]->GetStopException().IsValid())
+            {
+                m_current_thread = m_threads[idx];
+                break;
+            }
+        }
+    }
+    thread_sp = m_current_thread;
+}
+
+#endif
+
+void NativeThreadListDarwin::Dump(Stream &stream) const {
+  bool first = true;
+
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp) {
+      // Handle newlines between thread entries.
+      if (first)
+        first = false;
+      else
+        stream.PutChar('\n');
+      thread_sp->Dump(stream);
+    }
+  }
+}
+
+void NativeThreadListDarwin::ProcessWillResume(
+    NativeProcessDarwin &process, const ResumeActionList &thread_actions) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+
+  // Update our thread list, because sometimes libdispatch or the kernel
+  // will spawn threads while a task is suspended.
+  NativeThreadListDarwin::collection new_threads;
+
+// TODO implement this.
+#if 0
+    // First figure out if we were planning on running only one thread, and if
+    // so, force that thread to resume.
+    bool run_one_thread;
+    thread_t solo_thread = THREAD_NULL;
+    if ((thread_actions.GetSize() > 0) &&
+        (thread_actions.NumActionsWithState(eStateStepping) +
+         thread_actions.NumActionsWithState (eStateRunning) == 1))
+    {
+        run_one_thread = true;
+        const DNBThreadResumeAction *action_ptr = thread_actions.GetFirst();
+        size_t num_actions = thread_actions.GetSize();
+        for (size_t i = 0; i < num_actions; i++, action_ptr++)
+        {
+            if (action_ptr->state == eStateStepping || action_ptr->state == eStateRunning)
+            {
+                solo_thread = action_ptr->tid;
+                break;
+            }
+        }
+    }
+    else
+        run_one_thread = false;
+#endif
+
+  UpdateThreadList(process, true, &new_threads);
+
+#if 0
+    DNBThreadResumeAction resume_new_threads = { -1U, eStateRunning, 0, INVALID_NUB_ADDRESS };
+    // If we are planning to run only one thread, any new threads should be suspended.
+    if (run_one_thread)
+        resume_new_threads.state = eStateSuspended;
+
+    const size_t num_new_threads = new_threads.size();
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; idx < num_threads; ++idx)
+    {
+        MachThread *thread = m_threads[idx].get();
+        bool handled = false;
+        for (uint32_t new_idx = 0; new_idx < num_new_threads; ++new_idx)
+        {
+            if (thread == new_threads[new_idx].get())
+            {
+                thread->ThreadWillResume(&resume_new_threads);
+                handled = true;
+                break;
+            }
+        }
+
+        if (!handled)
+        {
+            const DNBThreadResumeAction *thread_action = thread_actions.GetActionForThread (thread->ThreadID(), true);
+            // There must always be a thread action for every thread.
+            assert (thread_action);
+            bool others_stopped = false;
+            if (solo_thread == thread->ThreadID())
+                others_stopped = true;
+            thread->ThreadWillResume (thread_action, others_stopped);
+        }
+    }
+    
+    if (new_threads.size())
+    {
+        for (uint32_t idx = 0; idx < num_new_threads; ++idx)
+        {
+            DNBLogThreadedIf (LOG_THREAD, "NativeThreadListDarwin::ProcessWillResume (pid = %4.4x) stop-id=%u, resuming newly discovered thread: 0x%8.8" PRIx64 ", thread-is-user-ready=%i)",
+                              process->ProcessID(), 
+                              process->StopCount(), 
+                              new_threads[idx]->ThreadID(),
+                              new_threads[idx]->IsUserReady());
+        }
+    }
+#endif
+}
+
+uint32_t NativeThreadListDarwin::ProcessDidStop(NativeProcessDarwin &process) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+
+  // Update our thread list.
+  UpdateThreadList(process, true);
+
+  for (auto thread_sp : m_threads) {
+    if (thread_sp)
+      thread_sp->ThreadDidStop();
+  }
+  return (uint32_t)m_threads.size();
+}
+
+//----------------------------------------------------------------------
+// Check each thread in our thread list to see if we should notify our
+// client of the current halt in execution.
+//
+// Breakpoints can have callback functions associated with them than
+// can return true to stop, or false to continue executing the inferior.
+//
+// RETURNS
+//    true if we should stop and notify our clients
+//    false if we should resume our child process and skip notification
+//----------------------------------------------------------------------
+bool NativeThreadListDarwin::ShouldStop(bool &step_more) {
+  std::lock_guard<std::recursive_mutex> locker(m_threads_mutex);
+  for (auto thread_sp : m_threads) {
+    if (thread_sp && thread_sp->ShouldStop(step_more))
+      return true;
+  }
+  return false;
+}
+
+// Implement.
+#if 0
+
+void
+NativeThreadListDarwin::NotifyBreakpointChanged (const DNBBreakpoint *bp)
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; idx < num_threads; ++idx)
+    {
+        m_threads[idx]->NotifyBreakpointChanged(bp);
+    }
+}
+
+
+uint32_t
+NativeThreadListDarwin::EnableHardwareBreakpoint (const DNBBreakpoint* bp) const
+{
+    if (bp != NULL)
+    {
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->EnableHardwareBreakpoint(bp);
+    }
+    return INVALID_NUB_HW_INDEX;
+}
+
+bool
+NativeThreadListDarwin::DisableHardwareBreakpoint (const DNBBreakpoint* bp) const
+{
+    if (bp != NULL)
+    {
+        const size_t num_threads = m_threads.size();
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->DisableHardwareBreakpoint(bp);
+    }
+    return false;
+}
+
+// DNBWatchpointSet() -> MachProcess::CreateWatchpoint() -> MachProcess::EnableWatchpoint()
+// -> NativeThreadListDarwin::EnableHardwareWatchpoint().
+uint32_t
+NativeThreadListDarwin::EnableHardwareWatchpoint (const DNBBreakpoint* wp) const
+{
+    uint32_t hw_index = INVALID_NUB_HW_INDEX;
+    if (wp != NULL)
+    {
+        PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+        const size_t num_threads = m_threads.size();
+        // On Mac OS X we have to prime the control registers for new threads.  We do this
+        // using the control register data for the first thread, for lack of a better way of choosing.
+        bool also_set_on_task = true;
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {                
+            if ((hw_index = m_threads[idx]->EnableHardwareWatchpoint(wp, also_set_on_task)) == INVALID_NUB_HW_INDEX)
+            {
+                // We know that idx failed for some reason.  Let's rollback the transaction for [0, idx).
+                for (uint32_t i = 0; i < idx; ++i)
+                    m_threads[i]->RollbackTransForHWP();
+                return INVALID_NUB_HW_INDEX;
+            }
+            also_set_on_task = false;
+        }
+        // Notify each thread to commit the pending transaction.
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->FinishTransForHWP();
+
+    }
+    return hw_index;
+}
+
+bool
+NativeThreadListDarwin::DisableHardwareWatchpoint (const DNBBreakpoint* wp) const
+{
+    if (wp != NULL)
+    {
+        PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+        const size_t num_threads = m_threads.size();
+        
+        // On Mac OS X we have to prime the control registers for new threads.  We do this
+        // using the control register data for the first thread, for lack of a better way of choosing.
+        bool also_set_on_task = true;
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+        {
+            if (!m_threads[idx]->DisableHardwareWatchpoint(wp, also_set_on_task))
+            {
+                // We know that idx failed for some reason.  Let's rollback the transaction for [0, idx).
+                for (uint32_t i = 0; i < idx; ++i)
+                    m_threads[i]->RollbackTransForHWP();
+                return false;
+            }
+            also_set_on_task = false;
+        }
+        // Notify each thread to commit the pending transaction.
+        for (uint32_t idx = 0; idx < num_threads; ++idx)
+            m_threads[idx]->FinishTransForHWP();
+
+        return true;
+    }
+    return false;
+}
+
+uint32_t
+NativeThreadListDarwin::NumSupportedHardwareWatchpoints () const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    const size_t num_threads = m_threads.size();
+    // Use an arbitrary thread to retrieve the number of supported hardware watchpoints.
+    if (num_threads)
+        return m_threads[0]->NumSupportedHardwareWatchpoints();
+    return 0;
+}
+
+uint32_t
+NativeThreadListDarwin::GetThreadIndexForThreadStoppedWithSignal (const int signo) const
+{
+    PTHREAD_MUTEX_LOCKER (locker, m_threads_mutex);
+    uint32_t should_stop = false;
+    const size_t num_threads = m_threads.size();
+    for (uint32_t idx = 0; !should_stop && idx < num_threads; ++idx)
+    {
+        if (m_threads[idx]->GetStopException().SoftSignal () == signo)
+            return idx;
+    }
+    return UINT32_MAX;
+}
+
+#endif