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llvm-project/lldb/source/Plugins/Process/Darwin/NativeThreadListDarwin.cpp

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//===-- NativeThreadListDarwin.cpp ------------------------------------*- C++
//-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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/Utility/Log.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/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);
LLDB_LOGF(log,
"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();
Status error;
auto mach_err = ::task_threads(task, &thread_list, &thread_list_count);
error.SetError(mach_err, eErrorTypeMachKernel);
if (error.Fail()) {
LLDB_LOGF(log,
"::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
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