src/third_party/llvm-project/lldb/source/Plugins/Process/mach-core/ThreadMachCore.cpp

//===-- ThreadMachCore.cpp --------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "ThreadMachCore.h"

#include "lldb/Utility/SafeMachO.h"

#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/State.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Unwind.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/StreamString.h"

#include "ProcessMachCore.h"
//#include "RegisterContextKDP_arm.h"
//#include "RegisterContextKDP_i386.h"
//#include "RegisterContextKDP_x86_64.h"

using namespace lldb;
using namespace lldb_private;

//----------------------------------------------------------------------
// Thread Registers
//----------------------------------------------------------------------

ThreadMachCore::ThreadMachCore(Process &process, lldb::tid_t tid)
    : Thread(process, tid), m_thread_name(), m_dispatch_queue_name(),
      m_thread_dispatch_qaddr(LLDB_INVALID_ADDRESS), m_thread_reg_ctx_sp() {}

ThreadMachCore::~ThreadMachCore() { DestroyThread(); }

const char *ThreadMachCore::GetName() {
  if (m_thread_name.empty())
    return nullptr;
  return m_thread_name.c_str();
}

void ThreadMachCore::RefreshStateAfterStop() {
  // Invalidate all registers in our register context. We don't set "force" to
  // true because the stop reply packet might have had some register values
  // that were expedited and these will already be copied into the register
  // context by the time this function gets called. The KDPRegisterContext
  // class has been made smart enough to detect when it needs to invalidate
  // which registers are valid by putting hooks in the register read and
  // register supply functions where they check the process stop ID and do the
  // right thing.
  const bool force = false;
  GetRegisterContext()->InvalidateIfNeeded(force);
}

bool ThreadMachCore::ThreadIDIsValid(lldb::tid_t thread) { return thread != 0; }

lldb::RegisterContextSP ThreadMachCore::GetRegisterContext() {
  if (!m_reg_context_sp)
    m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
  return m_reg_context_sp;
}

lldb::RegisterContextSP
ThreadMachCore::CreateRegisterContextForFrame(StackFrame *frame) {
  lldb::RegisterContextSP reg_ctx_sp;
  uint32_t concrete_frame_idx = 0;

  if (frame)
    concrete_frame_idx = frame->GetConcreteFrameIndex();

  if (concrete_frame_idx == 0) {
    if (!m_thread_reg_ctx_sp) {
      ProcessSP process_sp(GetProcess());

      ObjectFile *core_objfile =
          static_cast<ProcessMachCore *>(process_sp.get())->GetCoreObjectFile();
      if (core_objfile)
        m_thread_reg_ctx_sp =
            core_objfile->GetThreadContextAtIndex(GetID(), *this);
    }
    reg_ctx_sp = m_thread_reg_ctx_sp;
  } else {
    Unwind *unwinder = GetUnwinder();
    if (unwinder != nullptr)
      reg_ctx_sp = unwinder->CreateRegisterContextForFrame(frame);
  }
  return reg_ctx_sp;
}

bool ThreadMachCore::CalculateStopInfo() {
  ProcessSP process_sp(GetProcess());
  if (process_sp) {
    SetStopInfo(StopInfo::CreateStopReasonWithSignal(*this, SIGSTOP));
    return true;
  }
  return false;
}