ScriptInterpreter/Python/ScriptInterpreterPython.cpp

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

#ifdef LLDB_DISABLE_PYTHON

// Python is disabled in this build

#else

// LLDB Python header must be included first
#include "lldb-python.h"

#include "PythonDataObjects.h"
#include "PythonExceptionState.h"
#include "ScriptInterpreterPython.h"

#include <stdio.h>
#include <stdlib.h>

#include <mutex>
#include <string>

#include "lldb/API/SBValue.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Breakpoint/WatchpointOptions.h"
#include "lldb/Core/Communication.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/DataFormatters/TypeSummary.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/Pipe.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"

#if defined(_WIN32)
#include "lldb/Host/windows/ConnectionGenericFileWindows.h"
#endif

#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"

using namespace lldb;
using namespace lldb_private;

static ScriptInterpreterPython::SWIGInitCallback g_swig_init_callback = nullptr;
static ScriptInterpreterPython::SWIGBreakpointCallbackFunction
    g_swig_breakpoint_callback = nullptr;
static ScriptInterpreterPython::SWIGWatchpointCallbackFunction
    g_swig_watchpoint_callback = nullptr;
static ScriptInterpreterPython::SWIGPythonTypeScriptCallbackFunction
    g_swig_typescript_callback = nullptr;
static ScriptInterpreterPython::SWIGPythonCreateSyntheticProvider
    g_swig_synthetic_script = nullptr;
static ScriptInterpreterPython::SWIGPythonCreateCommandObject
    g_swig_create_cmd = nullptr;
static ScriptInterpreterPython::SWIGPythonCalculateNumChildren
    g_swig_calc_children = nullptr;
static ScriptInterpreterPython::SWIGPythonGetChildAtIndex
    g_swig_get_child_index = nullptr;
static ScriptInterpreterPython::SWIGPythonGetIndexOfChildWithName
    g_swig_get_index_child = nullptr;
static ScriptInterpreterPython::SWIGPythonCastPyObjectToSBValue
    g_swig_cast_to_sbvalue = nullptr;
static ScriptInterpreterPython::SWIGPythonGetValueObjectSPFromSBValue
    g_swig_get_valobj_sp_from_sbvalue = nullptr;
static ScriptInterpreterPython::SWIGPythonUpdateSynthProviderInstance
    g_swig_update_provider = nullptr;
static ScriptInterpreterPython::SWIGPythonMightHaveChildrenSynthProviderInstance
    g_swig_mighthavechildren_provider = nullptr;
static ScriptInterpreterPython::SWIGPythonGetValueSynthProviderInstance
    g_swig_getvalue_provider = nullptr;
static ScriptInterpreterPython::SWIGPythonCallCommand g_swig_call_command =
    nullptr;
static ScriptInterpreterPython::SWIGPythonCallCommandObject
    g_swig_call_command_object = nullptr;
static ScriptInterpreterPython::SWIGPythonCallModuleInit
    g_swig_call_module_init = nullptr;
static ScriptInterpreterPython::SWIGPythonCreateOSPlugin
    g_swig_create_os_plugin = nullptr;
static ScriptInterpreterPython::SWIGPythonScriptKeyword_Process
    g_swig_run_script_keyword_process = nullptr;
static ScriptInterpreterPython::SWIGPythonScriptKeyword_Thread
    g_swig_run_script_keyword_thread = nullptr;
static ScriptInterpreterPython::SWIGPythonScriptKeyword_Target
    g_swig_run_script_keyword_target = nullptr;
static ScriptInterpreterPython::SWIGPythonScriptKeyword_Frame
    g_swig_run_script_keyword_frame = nullptr;
static ScriptInterpreterPython::SWIGPythonScriptKeyword_Value
    g_swig_run_script_keyword_value = nullptr;
static ScriptInterpreterPython::SWIGPython_GetDynamicSetting g_swig_plugin_get =
    nullptr;
static ScriptInterpreterPython::SWIGPythonCreateScriptedThreadPlan
    g_swig_thread_plan_script = nullptr;
static ScriptInterpreterPython::SWIGPythonCallThreadPlan
    g_swig_call_thread_plan = nullptr;

static bool g_initialized = false;

namespace {

// Initializing Python is not a straightforward process.  We cannot control what
// external code may have done before getting to this point in LLDB, including
// potentially having already initialized Python, so we need to do a lot of work
// to ensure that the existing state of the system is maintained across our
// initialization.  We do this by using an RAII pattern where we save off
// initial
// state at the beginning, and restore it at the end
struct InitializePythonRAII {
public:
  InitializePythonRAII()
      : m_gil_state(PyGILState_UNLOCKED), m_was_already_initialized(false) {
    // Python will muck with STDIN terminal state, so save off any current TTY
    // settings so we can restore them.
    m_stdin_tty_state.Save(STDIN_FILENO, false);

    InitializePythonHome();

// Python < 3.2 and Python >= 3.2 reversed the ordering requirements for
// calling `Py_Initialize` and `PyEval_InitThreads`.  < 3.2 requires that you
// call `PyEval_InitThreads` first, and >= 3.2 requires that you call it last.
#if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 2) || (PY_MAJOR_VERSION > 3)
    Py_InitializeEx(0);
    InitializeThreadsPrivate();
#else
    InitializeThreadsPrivate();
    Py_InitializeEx(0);
#endif
  }

  ~InitializePythonRAII() {
    if (m_was_already_initialized) {
      Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT |
                                                      LIBLLDB_LOG_VERBOSE));

      if (log) {
        log->Printf("Releasing PyGILState. Returning to state = %slocked\n",
                    m_was_already_initialized == PyGILState_UNLOCKED ? "un"
                                                                     : "");
      }
      PyGILState_Release(m_gil_state);
    } else {
      // We initialized the threads in this function, just unlock the GIL.
      PyEval_SaveThread();
    }

    m_stdin_tty_state.Restore();
  }

private:
  void InitializePythonHome() {
#if defined(LLDB_PYTHON_HOME)
#if PY_MAJOR_VERSION >= 3
    size_t size = 0;
    static wchar_t *g_python_home = Py_DecodeLocale(LLDB_PYTHON_HOME, &size);
#else
    static char g_python_home[] = LLDB_PYTHON_HOME;
#endif
    Py_SetPythonHome(g_python_home);
#endif
  }

  void InitializeThreadsPrivate() {
    if (PyEval_ThreadsInitialized()) {
      Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT |
                                                      LIBLLDB_LOG_VERBOSE));

      m_was_already_initialized = true;
      m_gil_state = PyGILState_Ensure();
      if (log) {
        log->Printf("Ensured PyGILState. Previous state = %slocked\n",
                    m_gil_state == PyGILState_UNLOCKED ? "un" : "");
      }
      return;
    }

    // InitThreads acquires the GIL if it hasn't been called before.
    PyEval_InitThreads();
  }

  TerminalState m_stdin_tty_state;
  PyGILState_STATE m_gil_state;
  bool m_was_already_initialized;
};
}

ScriptInterpreterPython::Locker::Locker(ScriptInterpreterPython *py_interpreter,
                                        uint16_t on_entry, uint16_t on_leave,
                                        FILE *in, FILE *out, FILE *err)
    : ScriptInterpreterLocker(),
      m_teardown_session((on_leave & TearDownSession) == TearDownSession),
      m_python_interpreter(py_interpreter) {
  DoAcquireLock();
  if ((on_entry & InitSession) == InitSession) {
    if (DoInitSession(on_entry, in, out, err) == false) {
      // Don't teardown the session if we didn't init it.
      m_teardown_session = false;
    }
  }
}

bool ScriptInterpreterPython::Locker::DoAcquireLock() {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT |
                                                  LIBLLDB_LOG_VERBOSE));
  m_GILState = PyGILState_Ensure();
  if (log)
    log->Printf("Ensured PyGILState. Previous state = %slocked\n",
                m_GILState == PyGILState_UNLOCKED ? "un" : "");

  // we need to save the thread state when we first start the command
  // because we might decide to interrupt it while some action is taking
  // place outside of Python (e.g. printing to screen, waiting for the network,
  // ...)
  // in that case, _PyThreadState_Current will be NULL - and we would be unable
  // to set the asynchronous exception - not a desirable situation
  m_python_interpreter->SetThreadState(PyThreadState_Get());
  m_python_interpreter->IncrementLockCount();
  return true;
}

bool ScriptInterpreterPython::Locker::DoInitSession(uint16_t on_entry_flags,
                                                    FILE *in, FILE *out,
                                                    FILE *err) {
  if (!m_python_interpreter)
    return false;
  return m_python_interpreter->EnterSession(on_entry_flags, in, out, err);
}

bool ScriptInterpreterPython::Locker::DoFreeLock() {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT |
                                                  LIBLLDB_LOG_VERBOSE));
  if (log)
    log->Printf("Releasing PyGILState. Returning to state = %slocked\n",
                m_GILState == PyGILState_UNLOCKED ? "un" : "");
  PyGILState_Release(m_GILState);
  m_python_interpreter->DecrementLockCount();
  return true;
}

bool ScriptInterpreterPython::Locker::DoTearDownSession() {
  if (!m_python_interpreter)
    return false;
  m_python_interpreter->LeaveSession();
  return true;
}

ScriptInterpreterPython::Locker::~Locker() {
  if (m_teardown_session)
    DoTearDownSession();
  DoFreeLock();
}

ScriptInterpreterPython::ScriptInterpreterPython(
    CommandInterpreter &interpreter)
    : ScriptInterpreter(interpreter, eScriptLanguagePython),
      IOHandlerDelegateMultiline("DONE"), m_saved_stdin(), m_saved_stdout(),
      m_saved_stderr(), m_main_module(), m_lldb_module(),
      m_session_dict(PyInitialValue::Invalid),
      m_sys_module_dict(PyInitialValue::Invalid), m_run_one_line_function(),
      m_run_one_line_str_global(),
      m_dictionary_name(
          interpreter.GetDebugger().GetInstanceName().AsCString()),
      m_terminal_state(), m_active_io_handler(eIOHandlerNone),
      m_session_is_active(false), m_pty_slave_is_open(false),
      m_valid_session(true), m_lock_count(0), m_command_thread_state(nullptr) {
  InitializePrivate();

  m_dictionary_name.append("_dict");
  StreamString run_string;
  run_string.Printf("%s = dict()", m_dictionary_name.c_str());

  Locker locker(this, ScriptInterpreterPython::Locker::AcquireLock,
                ScriptInterpreterPython::Locker::FreeAcquiredLock);
  PyRun_SimpleString(run_string.GetData());

  run_string.Clear();
  run_string.Printf(
      "run_one_line (%s, 'import copy, keyword, os, re, sys, uuid, lldb')",
      m_dictionary_name.c_str());
  PyRun_SimpleString(run_string.GetData());

  // Reloading modules requires a different syntax in Python 2 and Python 3.
  // This provides
  // a consistent syntax no matter what version of Python.
  run_string.Clear();
  run_string.Printf("run_one_line (%s, 'from six.moves import reload_module')",
                    m_dictionary_name.c_str());
  PyRun_SimpleString(run_string.GetData());

  // WARNING: temporary code that loads Cocoa formatters - this should be done
  // on a per-platform basis rather than loading the whole set
  // and letting the individual formatter classes exploit APIs to check whether
  // they can/cannot do their task
  run_string.Clear();
  run_string.Printf(
      "run_one_line (%s, 'import lldb.formatters, lldb.formatters.cpp, pydoc')",
      m_dictionary_name.c_str());
  PyRun_SimpleString(run_string.GetData());
  run_string.Clear();

  run_string.Printf("run_one_line (%s, 'import lldb.embedded_interpreter; from "
                    "lldb.embedded_interpreter import run_python_interpreter; "
                    "from lldb.embedded_interpreter import run_one_line')",
                    m_dictionary_name.c_str());
  PyRun_SimpleString(run_string.GetData());
  run_string.Clear();

  run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64
                    "; pydoc.pager = pydoc.plainpager')",
                    m_dictionary_name.c_str(),
                    interpreter.GetDebugger().GetID());
  PyRun_SimpleString(run_string.GetData());
}

ScriptInterpreterPython::~ScriptInterpreterPython() {
  // the session dictionary may hold objects with complex state
  // which means that they may need to be torn down with some level of smarts
  // and that, in turn, requires a valid thread state
  // force Python to procure itself such a thread state, nuke the session
  // dictionary
  // and then release it for others to use and proceed with the rest of the
  // shutdown
  auto gil_state = PyGILState_Ensure();
  m_session_dict.Reset();
  PyGILState_Release(gil_state);
}

void ScriptInterpreterPython::Initialize() {
  static std::once_flag g_once_flag;

  std::call_once(g_once_flag, []() {
    PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                  GetPluginDescriptionStatic(),
                                  lldb::eScriptLanguagePython, CreateInstance);
  });
}

void ScriptInterpreterPython::Terminate() {}

lldb::ScriptInterpreterSP
ScriptInterpreterPython::CreateInstance(CommandInterpreter &interpreter) {
  return std::make_shared<ScriptInterpreterPython>(interpreter);
}

lldb_private::ConstString ScriptInterpreterPython::GetPluginNameStatic() {
  static ConstString g_name("script-python");
  return g_name;
}

const char *ScriptInterpreterPython::GetPluginDescriptionStatic() {
  return "Embedded Python interpreter";
}

lldb_private::ConstString ScriptInterpreterPython::GetPluginName() {
  return GetPluginNameStatic();
}

uint32_t ScriptInterpreterPython::GetPluginVersion() { return 1; }

void ScriptInterpreterPython::IOHandlerActivated(IOHandler &io_handler) {
  const char *instructions = nullptr;

  switch (m_active_io_handler) {
  case eIOHandlerNone:
    break;
  case eIOHandlerBreakpoint:
    instructions = R"(Enter your Python command(s). Type 'DONE' to end.
def function (frame, bp_loc, internal_dict):
    """frame: the lldb.SBFrame for the location at which you stopped
       bp_loc: an lldb.SBBreakpointLocation for the breakpoint location information
       internal_dict: an LLDB support object not to be used"""
)";
    break;
  case eIOHandlerWatchpoint:
    instructions = "Enter your Python command(s). Type 'DONE' to end.\n";
    break;
  }

  if (instructions) {
    StreamFileSP output_sp(io_handler.GetOutputStreamFile());
    if (output_sp) {
      output_sp->PutCString(instructions);
      output_sp->Flush();
    }
  }
}

void ScriptInterpreterPython::IOHandlerInputComplete(IOHandler &io_handler,
                                                     std::string &data) {
  io_handler.SetIsDone(true);
  bool batch_mode = m_interpreter.GetBatchCommandMode();

  switch (m_active_io_handler) {
  case eIOHandlerNone:
    break;
  case eIOHandlerBreakpoint: {
    std::vector<BreakpointOptions *> *bp_options_vec =
        (std::vector<BreakpointOptions *> *)io_handler.GetUserData();
    for (auto bp_options : *bp_options_vec) {
      if (!bp_options)
        continue;

      auto data_ap = llvm::make_unique<BreakpointOptions::CommandData>();
      if (!data_ap)
        break;
      data_ap->user_source.SplitIntoLines(data);

      if (GenerateBreakpointCommandCallbackData(data_ap->user_source,
                                                data_ap->script_source)
              .Success()) {
        auto baton_sp = std::make_shared<BreakpointOptions::CommandBaton>(
            std::move(data_ap));
        bp_options->SetCallback(
            ScriptInterpreterPython::BreakpointCallbackFunction, baton_sp);
      } else if (!batch_mode) {
        StreamFileSP error_sp = io_handler.GetErrorStreamFile();
        if (error_sp) {
          error_sp->Printf("Warning: No command attached to breakpoint.\n");
          error_sp->Flush();
        }
      }
    }
    m_active_io_handler = eIOHandlerNone;
  } break;
  case eIOHandlerWatchpoint: {
    WatchpointOptions *wp_options =
        (WatchpointOptions *)io_handler.GetUserData();
    auto data_ap = llvm::make_unique<WatchpointOptions::CommandData>();
    data_ap->user_source.SplitIntoLines(data);

    if (GenerateWatchpointCommandCallbackData(data_ap->user_source,
                                              data_ap->script_source)) {
      auto baton_sp =
          std::make_shared<WatchpointOptions::CommandBaton>(std::move(data_ap));
      wp_options->SetCallback(
          ScriptInterpreterPython::WatchpointCallbackFunction, baton_sp);
    } else if (!batch_mode) {
      StreamFileSP error_sp = io_handler.GetErrorStreamFile();
      if (error_sp) {
        error_sp->Printf("Warning: No command attached to breakpoint.\n");
        error_sp->Flush();
      }
    }
    m_active_io_handler = eIOHandlerNone;
  } break;
  }
}

void ScriptInterpreterPython::ResetOutputFileHandle(FILE *fh) {}

void ScriptInterpreterPython::SaveTerminalState(int fd) {
  // Python mucks with the terminal state of STDIN. If we can possibly avoid
  // this by setting the file handles up correctly prior to entering the
  // interpreter we should. For now we save and restore the terminal state
  // on the input file handle.
  m_terminal_state.Save(fd, false);
}

void ScriptInterpreterPython::RestoreTerminalState() {
  // Python mucks with the terminal state of STDIN. If we can possibly avoid
  // this by setting the file handles up correctly prior to entering the
  // interpreter we should. For now we save and restore the terminal state
  // on the input file handle.
  m_terminal_state.Restore();
}

void ScriptInterpreterPython::LeaveSession() {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT));
  if (log)
    log->PutCString("ScriptInterpreterPython::LeaveSession()");

  // checking that we have a valid thread state - since we use our own threading
  // and locking
  // in some (rare) cases during cleanup Python may end up believing we have no
  // thread state
  // and PyImport_AddModule will crash if that is the case - since that seems to
  // only happen
  // when destroying the SBDebugger, we can make do without clearing up stdout
  // and stderr

  // rdar://problem/11292882
  // When the current thread state is NULL, PyThreadState_Get() issues a fatal
  // error.
  if (PyThreadState_GetDict()) {
    PythonDictionary &sys_module_dict = GetSysModuleDictionary();
    if (sys_module_dict.IsValid()) {
      if (m_saved_stdin.IsValid()) {
        sys_module_dict.SetItemForKey(PythonString("stdin"), m_saved_stdin);
        m_saved_stdin.Reset();
      }
      if (m_saved_stdout.IsValid()) {
        sys_module_dict.SetItemForKey(PythonString("stdout"), m_saved_stdout);
        m_saved_stdout.Reset();
      }
      if (m_saved_stderr.IsValid()) {
        sys_module_dict.SetItemForKey(PythonString("stderr"), m_saved_stderr);
        m_saved_stderr.Reset();
      }
    }
  }

  m_session_is_active = false;
}

bool ScriptInterpreterPython::SetStdHandle(File &file, const char *py_name,
                                           PythonFile &save_file,
                                           const char *mode) {
  if (file.IsValid()) {
    // Flush the file before giving it to python to avoid interleaved output.
    file.Flush();

    PythonDictionary &sys_module_dict = GetSysModuleDictionary();

    save_file = sys_module_dict.GetItemForKey(PythonString(py_name))
                    .AsType<PythonFile>();

    PythonFile new_file(file, mode);
    sys_module_dict.SetItemForKey(PythonString(py_name), new_file);
    return true;
  } else
    save_file.Reset();
  return false;
}

bool ScriptInterpreterPython::EnterSession(uint16_t on_entry_flags, FILE *in,
                                           FILE *out, FILE *err) {
  // If we have already entered the session, without having officially 'left'
  // it, then there is no need to
  // 'enter' it again.
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT));
  if (m_session_is_active) {
    if (log)
      log->Printf(
          "ScriptInterpreterPython::EnterSession(on_entry_flags=0x%" PRIx16
          ") session is already active, returning without doing anything",
          on_entry_flags);
    return false;
  }

  if (log)
    log->Printf(
        "ScriptInterpreterPython::EnterSession(on_entry_flags=0x%" PRIx16 ")",
        on_entry_flags);

  m_session_is_active = true;

  StreamString run_string;

  if (on_entry_flags & Locker::InitGlobals) {
    run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64,
                      m_dictionary_name.c_str(),
                      GetCommandInterpreter().GetDebugger().GetID());
    run_string.Printf(
        "; lldb.debugger = lldb.SBDebugger.FindDebuggerWithID (%" PRIu64 ")",
        GetCommandInterpreter().GetDebugger().GetID());
    run_string.PutCString("; lldb.target = lldb.debugger.GetSelectedTarget()");
    run_string.PutCString("; lldb.process = lldb.target.GetProcess()");
    run_string.PutCString("; lldb.thread = lldb.process.GetSelectedThread ()");
    run_string.PutCString("; lldb.frame = lldb.thread.GetSelectedFrame ()");
    run_string.PutCString("')");
  } else {
    // If we aren't initing the globals, we should still always set the debugger
    // (since that is always unique.)
    run_string.Printf("run_one_line (%s, 'lldb.debugger_unique_id = %" PRIu64,
                      m_dictionary_name.c_str(),
                      GetCommandInterpreter().GetDebugger().GetID());
    run_string.Printf(
        "; lldb.debugger = lldb.SBDebugger.FindDebuggerWithID (%" PRIu64 ")",
        GetCommandInterpreter().GetDebugger().GetID());
    run_string.PutCString("')");
  }

  PyRun_SimpleString(run_string.GetData());
  run_string.Clear();

  PythonDictionary &sys_module_dict = GetSysModuleDictionary();
  if (sys_module_dict.IsValid()) {
    File in_file(in, false);
    File out_file(out, false);
    File err_file(err, false);

    lldb::StreamFileSP in_sp;
    lldb::StreamFileSP out_sp;
    lldb::StreamFileSP err_sp;
    if (!in_file.IsValid() || !out_file.IsValid() || !err_file.IsValid())
      m_interpreter.GetDebugger().AdoptTopIOHandlerFilesIfInvalid(in_sp, out_sp,
                                                                  err_sp);

    if (on_entry_flags & Locker::NoSTDIN) {
      m_saved_stdin.Reset();
    } else {
      if (!SetStdHandle(in_file, "stdin", m_saved_stdin, "r")) {
        if (in_sp)
          SetStdHandle(in_sp->GetFile(), "stdin", m_saved_stdin, "r");
      }
    }

    if (!SetStdHandle(out_file, "stdout", m_saved_stdout, "w")) {
      if (out_sp)
        SetStdHandle(out_sp->GetFile(), "stdout", m_saved_stdout, "w");
    }

    if (!SetStdHandle(err_file, "stderr", m_saved_stderr, "w")) {
      if (err_sp)
        SetStdHandle(err_sp->GetFile(), "stderr", m_saved_stderr, "w");
    }
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  return true;
}

PythonObject &ScriptInterpreterPython::GetMainModule() {
  if (!m_main_module.IsValid())
    m_main_module.Reset(PyRefType::Borrowed, PyImport_AddModule("__main__"));
  return m_main_module;
}

PythonDictionary &ScriptInterpreterPython::GetSessionDictionary() {
  if (m_session_dict.IsValid())
    return m_session_dict;

  PythonObject &main_module = GetMainModule();
  if (!main_module.IsValid())
    return m_session_dict;

  PythonDictionary main_dict(PyRefType::Borrowed,
                             PyModule_GetDict(main_module.get()));
  if (!main_dict.IsValid())
    return m_session_dict;

  PythonObject item = main_dict.GetItemForKey(PythonString(m_dictionary_name));
  m_session_dict.Reset(PyRefType::Borrowed, item.get());
  return m_session_dict;
}

PythonDictionary &ScriptInterpreterPython::GetSysModuleDictionary() {
  if (m_sys_module_dict.IsValid())
    return m_sys_module_dict;

  PythonObject sys_module(PyRefType::Borrowed, PyImport_AddModule("sys"));
  if (sys_module.IsValid())
    m_sys_module_dict.Reset(PyRefType::Borrowed,
                            PyModule_GetDict(sys_module.get()));
  return m_sys_module_dict;
}

static std::string GenerateUniqueName(const char *base_name_wanted,
                                      uint32_t &functions_counter,
                                      const void *name_token = nullptr) {
  StreamString sstr;

  if (!base_name_wanted)
    return std::string();

  if (!name_token)
    sstr.Printf("%s_%d", base_name_wanted, functions_counter++);
  else
    sstr.Printf("%s_%p", base_name_wanted, name_token);

  return sstr.GetString();
}

bool ScriptInterpreterPython::GetEmbeddedInterpreterModuleObjects() {
  if (m_run_one_line_function.IsValid())
    return true;

  PythonObject module(PyRefType::Borrowed,
                      PyImport_AddModule("lldb.embedded_interpreter"));
  if (!module.IsValid())
    return false;

  PythonDictionary module_dict(PyRefType::Borrowed,
                               PyModule_GetDict(module.get()));
  if (!module_dict.IsValid())
    return false;

  m_run_one_line_function =
      module_dict.GetItemForKey(PythonString("run_one_line"));
  m_run_one_line_str_global =
      module_dict.GetItemForKey(PythonString("g_run_one_line_str"));
  return m_run_one_line_function.IsValid();
}

static void ReadThreadBytesReceived(void *baton, const void *src,
                                    size_t src_len) {
  if (src && src_len) {
    Stream *strm = (Stream *)baton;
    strm->Write(src, src_len);
    strm->Flush();
  }
}

bool ScriptInterpreterPython::ExecuteOneLine(
    const char *command, CommandReturnObject *result,
    const ExecuteScriptOptions &options) {
  if (!m_valid_session)
    return false;

  if (command && command[0]) {
    // We want to call run_one_line, passing in the dictionary and the command
    // string.  We cannot do this through
    // PyRun_SimpleString here because the command string may contain escaped
    // characters, and putting it inside
    // another string to pass to PyRun_SimpleString messes up the escaping.  So
    // we use the following more complicated
    // method to pass the command string directly down to Python.
    Debugger &debugger = m_interpreter.GetDebugger();

    StreamFileSP input_file_sp;
    StreamFileSP output_file_sp;
    StreamFileSP error_file_sp;
    Communication output_comm(
        "lldb.ScriptInterpreterPython.ExecuteOneLine.comm");
    bool join_read_thread = false;
    if (options.GetEnableIO()) {
      if (result) {
        input_file_sp = debugger.GetInputFile();
        // Set output to a temporary file so we can forward the results on to
        // the result object

        Pipe pipe;
        Error pipe_result = pipe.CreateNew(false);
        if (pipe_result.Success()) {
#if defined(_WIN32)
          lldb::file_t read_file = pipe.GetReadNativeHandle();
          pipe.ReleaseReadFileDescriptor();
          std::unique_ptr<ConnectionGenericFile> conn_ap(
              new ConnectionGenericFile(read_file, true));
#else
          std::unique_ptr<ConnectionFileDescriptor> conn_ap(
              new ConnectionFileDescriptor(pipe.ReleaseReadFileDescriptor(),
                                           true));
#endif
          if (conn_ap->IsConnected()) {
            output_comm.SetConnection(conn_ap.release());
            output_comm.SetReadThreadBytesReceivedCallback(
                ReadThreadBytesReceived, &result->GetOutputStream());
            output_comm.StartReadThread();
            join_read_thread = true;
            FILE *outfile_handle =
                fdopen(pipe.ReleaseWriteFileDescriptor(), "w");
            output_file_sp.reset(new StreamFile(outfile_handle, true));
            error_file_sp = output_file_sp;
            if (outfile_handle)
              ::setbuf(outfile_handle, nullptr);

            result->SetImmediateOutputFile(
                debugger.GetOutputFile()->GetFile().GetStream());
            result->SetImmediateErrorFile(
                debugger.GetErrorFile()->GetFile().GetStream());
          }
        }
      }
      if (!input_file_sp || !output_file_sp || !error_file_sp)
        debugger.AdoptTopIOHandlerFilesIfInvalid(input_file_sp, output_file_sp,
                                                 error_file_sp);
    } else {
      input_file_sp.reset(new StreamFile());
      input_file_sp->GetFile().Open(FileSystem::DEV_NULL,
                                    File::eOpenOptionRead);
      output_file_sp.reset(new StreamFile());
      output_file_sp->GetFile().Open(FileSystem::DEV_NULL,
                                     File::eOpenOptionWrite);
      error_file_sp = output_file_sp;
    }

    FILE *in_file = input_file_sp->GetFile().GetStream();
    FILE *out_file = output_file_sp->GetFile().GetStream();
    FILE *err_file = error_file_sp->GetFile().GetStream();
    bool success = false;
    {
      // WARNING!  It's imperative that this RAII scope be as tight as possible.
      // In particular, the
      // scope must end *before* we try to join the read thread.  The reason for
      // this is that a
      // pre-requisite for joining the read thread is that we close the write
      // handle (to break the
      // pipe and cause it to wake up and exit).  But acquiring the GIL as below
      // will redirect Python's
      // stdio to use this same handle.  If we close the handle while Python is
      // still using it, bad
      // things will happen.
      Locker locker(
          this,
          ScriptInterpreterPython::Locker::AcquireLock |
              ScriptInterpreterPython::Locker::InitSession |
              (options.GetSetLLDBGlobals()
                   ? ScriptInterpreterPython::Locker::InitGlobals
                   : 0) |
              ((result && result->GetInteractive()) ? 0 : Locker::NoSTDIN),
          ScriptInterpreterPython::Locker::FreeAcquiredLock |
              ScriptInterpreterPython::Locker::TearDownSession,
          in_file, out_file, err_file);

      // Find the correct script interpreter dictionary in the main module.
      PythonDictionary &session_dict = GetSessionDictionary();
      if (session_dict.IsValid()) {
        if (GetEmbeddedInterpreterModuleObjects()) {
          if (PyCallable_Check(m_run_one_line_function.get())) {
            PythonObject pargs(
                PyRefType::Owned,
                Py_BuildValue("(Os)", session_dict.get(), command));
            if (pargs.IsValid()) {
              PythonObject return_value(
                  PyRefType::Owned,
                  PyObject_CallObject(m_run_one_line_function.get(),
                                      pargs.get()));
              if (return_value.IsValid())
                success = true;
              else if (options.GetMaskoutErrors() && PyErr_Occurred()) {
                PyErr_Print();
                PyErr_Clear();
              }
            }
          }
        }
      }

      // Flush our output and error file handles
      ::fflush(out_file);
      if (out_file != err_file)
        ::fflush(err_file);
    }

    if (join_read_thread) {
      // Close the write end of the pipe since we are done with our
      // one line script. This should cause the read thread that
      // output_comm is using to exit
      output_file_sp->GetFile().Close();
      // The close above should cause this thread to exit when it gets
      // to the end of file, so let it get all its data
      output_comm.JoinReadThread();
      // Now we can close the read end of the pipe
      output_comm.Disconnect();
    }

    if (success)
      return true;

    // The one-liner failed.  Append the error message.
    if (result)
      result->AppendErrorWithFormat(
          "python failed attempting to evaluate '%s'\n", command);
    return false;
  }

  if (result)
    result->AppendError("empty command passed to python\n");
  return false;
}

class IOHandlerPythonInterpreter : public IOHandler {
public:
  IOHandlerPythonInterpreter(Debugger &debugger,
                             ScriptInterpreterPython *python)
      : IOHandler(debugger, IOHandler::Type::PythonInterpreter),
        m_python(python) {}

  ~IOHandlerPythonInterpreter() override {}

  ConstString GetControlSequence(char ch) override {
    if (ch == 'd')
      return ConstString("quit()\n");
    return ConstString();
  }

  void Run() override {
    if (m_python) {
      int stdin_fd = GetInputFD();
      if (stdin_fd >= 0) {
        Terminal terminal(stdin_fd);
        TerminalState terminal_state;
        const bool is_a_tty = terminal.IsATerminal();

        if (is_a_tty) {
          terminal_state.Save(stdin_fd, false);
          terminal.SetCanonical(false);
          terminal.SetEcho(true);
        }

        ScriptInterpreterPython::Locker locker(
            m_python, ScriptInterpreterPython::Locker::AcquireLock |
                          ScriptInterpreterPython::Locker::InitSession |
                          ScriptInterpreterPython::Locker::InitGlobals,
            ScriptInterpreterPython::Locker::FreeAcquiredLock |
                ScriptInterpreterPython::Locker::TearDownSession);

        // The following call drops into the embedded interpreter loop and stays
        // there until the
        // user chooses to exit from the Python interpreter.
        // This embedded interpreter will, as any Python code that performs I/O,
        // unlock the GIL before
        // a system call that can hang, and lock it when the syscall has
        // returned.

        // We need to surround the call to the embedded interpreter with calls
        // to PyGILState_Ensure and
        // PyGILState_Release (using the Locker above). This is because Python
        // has a global lock which must be held whenever we want
        // to touch any Python objects. Otherwise, if the user calls Python
        // code, the interpreter state will be off,
        // and things could hang (it's happened before).

        StreamString run_string;
        run_string.Printf("run_python_interpreter (%s)",
                          m_python->GetDictionaryName());
        PyRun_SimpleString(run_string.GetData());

        if (is_a_tty)
          terminal_state.Restore();
      }
    }
    SetIsDone(true);
  }

  void Cancel() override {}

  bool Interrupt() override { return m_python->Interrupt(); }

  void GotEOF() override {}

protected:
  ScriptInterpreterPython *m_python;
};

void ScriptInterpreterPython::ExecuteInterpreterLoop() {
  Timer scoped_timer(LLVM_PRETTY_FUNCTION, LLVM_PRETTY_FUNCTION);

  Debugger &debugger = GetCommandInterpreter().GetDebugger();

  // At the moment, the only time the debugger does not have an input file
  // handle is when this is called
  // directly from Python, in which case it is both dangerous and unnecessary
  // (not to mention confusing) to
  // try to embed a running interpreter loop inside the already running Python
  // interpreter loop, so we won't
  // do it.

  if (!debugger.GetInputFile()->GetFile().IsValid())
    return;

  IOHandlerSP io_handler_sp(new IOHandlerPythonInterpreter(debugger, this));
  if (io_handler_sp) {
    debugger.PushIOHandler(io_handler_sp);
  }
}

bool ScriptInterpreterPython::Interrupt() {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SCRIPT));

  if (IsExecutingPython()) {
    PyThreadState *state = PyThreadState_GET();
    if (!state)
      state = GetThreadState();
    if (state) {
      long tid = state->thread_id;
      PyThreadState_Swap(state);
      int num_threads = PyThreadState_SetAsyncExc(tid, PyExc_KeyboardInterrupt);
      if (log)
        log->Printf("ScriptInterpreterPython::Interrupt() sending "
                    "PyExc_KeyboardInterrupt (tid = %li, num_threads = %i)...",
                    tid, num_threads);
      return true;
    }
  }
  if (log)
    log->Printf("ScriptInterpreterPython::Interrupt() python code not running, "
                "can't interrupt");
  return false;
}
bool ScriptInterpreterPython::ExecuteOneLineWithReturn(
    const char *in_string, ScriptInterpreter::ScriptReturnType return_type,
    void *ret_value, const ExecuteScriptOptions &options) {

  Locker locker(this, ScriptInterpreterPython::Locker::AcquireLock |
                          ScriptInterpreterPython::Locker::InitSession |
                          (options.GetSetLLDBGlobals()
                               ? ScriptInterpreterPython::Locker::InitGlobals
                               : 0) |
                          Locker::NoSTDIN,
                ScriptInterpreterPython::Locker::FreeAcquiredLock |
                    ScriptInterpreterPython::Locker::TearDownSession);

  PythonObject py_return;
  PythonObject &main_module = GetMainModule();
  PythonDictionary globals(PyRefType::Borrowed,
                           PyModule_GetDict(main_module.get()));
  PythonObject py_error;
  bool ret_success = false;
  int success;

  PythonDictionary locals = GetSessionDictionary();

  if (!locals.IsValid()) {
    locals.Reset(
        PyRefType::Owned,
        PyObject_GetAttrString(globals.get(), m_dictionary_name.c_str()));
  }

  if (!locals.IsValid())
    locals = globals;

  py_error.Reset(PyRefType::Borrowed, PyErr_Occurred());
  if (py_error.IsValid())
    PyErr_Clear();

  if (in_string != nullptr) {
    { // scope for PythonInputReaderManager
      // PythonInputReaderManager py_input(options.GetEnableIO() ? this : NULL);
      py_return.Reset(
          PyRefType::Owned,
          PyRun_String(in_string, Py_eval_input, globals.get(), locals.get()));
      if (!py_return.IsValid()) {
        py_error.Reset(PyRefType::Borrowed, PyErr_Occurred());
        if (py_error.IsValid())
          PyErr_Clear();

        py_return.Reset(PyRefType::Owned,
                        PyRun_String(in_string, Py_single_input, globals.get(),
                                     locals.get()));
      }
    }

    if (py_return.IsValid()) {
      switch (return_type) {
      case eScriptReturnTypeCharPtr: // "char *"
      {
        const char format[3] = "s#";
        success = PyArg_Parse(py_return.get(), format, (char **)ret_value);
        break;
      }
      case eScriptReturnTypeCharStrOrNone: // char* or NULL if py_return ==
                                           // Py_None
        {
          const char format[3] = "z";
          success = PyArg_Parse(py_return.get(), format, (char **)ret_value);
          break;
        }
      case eScriptReturnTypeBool: {
        const char format[2] = "b";
        success = PyArg_Parse(py_return.get(), format, (bool *)ret_value);
        break;
      }
      case eScriptReturnTypeShortInt: {
        const char format[2] = "h";
        success = PyArg_Parse(py_return.get(), format, (short *)ret_value);
        break;
      }
      case eScriptReturnTypeShortIntUnsigned: {
        const char format[2] = "H";
        success =
            PyArg_Parse(py_return.get(), format, (unsigned short *)ret_value);
        break;
      }
      case eScriptReturnTypeInt: {
        const char format[2] = "i";
        success = PyArg_Parse(py_return.get(), format, (int *)ret_value);
        break;
      }
      case eScriptReturnTypeIntUnsigned: {
        const char format[2] = "I";
        success =
            PyArg_Parse(py_return.get(), format, (unsigned int *)ret_value);
        break;
      }
      case eScriptReturnTypeLongInt: {
        const char format[2] = "l";
        success = PyArg_Parse(py_return.get(), format, (long *)ret_value);
        break;
      }
      case eScriptReturnTypeLongIntUnsigned: {
        const char format[2] = "k";
        success =
            PyArg_Parse(py_return.get(), format, (unsigned long *)ret_value);
        break;
      }
      case eScriptReturnTypeLongLong: {
        const char format[2] = "L";
        success = PyArg_Parse(py_return.get(), format, (long long *)ret_value);
        break;
      }
      case eScriptReturnTypeLongLongUnsigned: {
        const char format[2] = "K";
        success = PyArg_Parse(py_return.get(), format,
                              (unsigned long long *)ret_value);
        break;
      }
      case eScriptReturnTypeFloat: {
        const char format[2] = "f";
        success = PyArg_Parse(py_return.get(), format, (float *)ret_value);
        break;
      }
      case eScriptReturnTypeDouble: {
        const char format[2] = "d";
        success = PyArg_Parse(py_return.get(), format, (double *)ret_value);
        break;
      }
      case eScriptReturnTypeChar: {
        const char format[2] = "c";
        success = PyArg_Parse(py_return.get(), format, (char *)ret_value);
        break;
      }
      case eScriptReturnTypeOpaqueObject: {
        success = true;
        PyObject *saved_value = py_return.get();
        Py_XINCREF(saved_value);
        *((PyObject **)ret_value) = saved_value;
        break;
      }
      }

      if (success)
        ret_success = true;
      else
        ret_success = false;
    }
  }

  py_error.Reset(PyRefType::Borrowed, PyErr_Occurred());
  if (py_error.IsValid()) {
    ret_success = false;
    if (options.GetMaskoutErrors()) {
      if (PyErr_GivenExceptionMatches(py_error.get(), PyExc_SyntaxError))
        PyErr_Print();
      PyErr_Clear();
    }
  }

  return ret_success;
}

Error ScriptInterpreterPython::ExecuteMultipleLines(
    const char *in_string, const ExecuteScriptOptions &options) {
  Error error;

  Locker locker(this, ScriptInterpreterPython::Locker::AcquireLock |
                          ScriptInterpreterPython::Locker::InitSession |
                          (options.GetSetLLDBGlobals()
                               ? ScriptInterpreterPython::Locker::InitGlobals
                               : 0) |
                          Locker::NoSTDIN,
                ScriptInterpreterPython::Locker::FreeAcquiredLock |
                    ScriptInterpreterPython::Locker::TearDownSession);

  PythonObject return_value;
  PythonObject &main_module = GetMainModule();
  PythonDictionary globals(PyRefType::Borrowed,
                           PyModule_GetDict(main_module.get()));
  PythonObject py_error;

  PythonDictionary locals = GetSessionDictionary();

  if (!locals.IsValid())
    locals.Reset(
        PyRefType::Owned,
        PyObject_GetAttrString(globals.get(), m_dictionary_name.c_str()));

  if (!locals.IsValid())
    locals = globals;

  py_error.Reset(PyRefType::Borrowed, PyErr_Occurred());
  if (py_error.IsValid())
    PyErr_Clear();

  if (in_string != nullptr) {
    PythonObject code_object;
    code_object.Reset(PyRefType::Owned,
                      Py_CompileString(in_string, "temp.py", Py_file_input));

    if (code_object.IsValid()) {
// In Python 2.x, PyEval_EvalCode takes a PyCodeObject, but in Python 3.x, it
// takes
// a PyObject.  They are convertible (hence the function
// PyCode_Check(PyObject*), so
// we have to do the cast for Python 2.x
#if PY_MAJOR_VERSION >= 3
      PyObject *py_code_obj = code_object.get();
#else
      PyCodeObject *py_code_obj =
          reinterpret_cast<PyCodeObject *>(code_object.get());
#endif
      return_value.Reset(
          PyRefType::Owned,
          PyEval_EvalCode(py_code_obj, globals.get(), locals.get()));
    }
  }

  PythonExceptionState exception_state(!options.GetMaskoutErrors());
  if (exception_state.IsError())
    error.SetErrorString(exception_state.Format().c_str());

  return error;
}

void ScriptInterpreterPython::CollectDataForBreakpointCommandCallback(
    std::vector<BreakpointOptions *> &bp_options_vec,
    CommandReturnObject &result) {
  m_active_io_handler = eIOHandlerBreakpoint;
  m_interpreter.GetPythonCommandsFromIOHandler("    ", *this, true,
                                               &bp_options_vec);
}

void ScriptInterpreterPython::CollectDataForWatchpointCommandCallback(
    WatchpointOptions *wp_options, CommandReturnObject &result) {
  m_active_io_handler = eIOHandlerWatchpoint;
  m_interpreter.GetPythonCommandsFromIOHandler("    ", *this, true, wp_options);
}

void ScriptInterpreterPython::SetBreakpointCommandCallbackFunction(
    BreakpointOptions *bp_options, const char *function_name) {
  // For now just cons up a oneliner that calls the provided function.
  std::string oneliner("return ");
  oneliner += function_name;
  oneliner += "(frame, bp_loc, internal_dict)";
  m_interpreter.GetScriptInterpreter()->SetBreakpointCommandCallback(
      bp_options, oneliner.c_str());
}

// Set a Python one-liner as the callback for the breakpoint.
Error ScriptInterpreterPython::SetBreakpointCommandCallback(
    BreakpointOptions *bp_options, const char *command_body_text) {
  auto data_ap = llvm::make_unique<BreakpointOptions::CommandData>();

  // Split the command_body_text into lines, and pass that to
  // GenerateBreakpointCommandCallbackData.  That will
  // wrap the body in an auto-generated function, and return the function name
  // in script_source.  That is what
  // the callback will actually invoke.

  data_ap->user_source.SplitIntoLines(command_body_text);
  Error error = GenerateBreakpointCommandCallbackData(data_ap->user_source,
                                                      data_ap->script_source);
  if (error.Success()) {
    auto baton_sp =
        std::make_shared<BreakpointOptions::CommandBaton>(std::move(data_ap));
    bp_options->SetCallback(ScriptInterpreterPython::BreakpointCallbackFunction,
                            baton_sp);
    return error;
  } else
    return error;
}

// Set a Python one-liner as the callback for the watchpoint.
void ScriptInterpreterPython::SetWatchpointCommandCallback(
    WatchpointOptions *wp_options, const char *oneliner) {
  auto data_ap = llvm::make_unique<WatchpointOptions::CommandData>();

  // It's necessary to set both user_source and script_source to the oneliner.
  // The former is used to generate callback description (as in watchpoint
  // command list)
  // while the latter is used for Python to interpret during the actual
  // callback.

  data_ap->user_source.AppendString(oneliner);
  data_ap->script_source.assign(oneliner);

  if (GenerateWatchpointCommandCallbackData(data_ap->user_source,
                                            data_ap->script_source)) {
    auto baton_sp =
        std::make_shared<WatchpointOptions::CommandBaton>(std::move(data_ap));
    wp_options->SetCallback(ScriptInterpreterPython::WatchpointCallbackFunction,
                            baton_sp);
  }

  return;
}

Error ScriptInterpreterPython::ExportFunctionDefinitionToInterpreter(
    StringList &function_def) {
  // Convert StringList to one long, newline delimited, const char *.
  std::string function_def_string(function_def.CopyList());

  Error error = ExecuteMultipleLines(
      function_def_string.c_str(),
      ScriptInterpreter::ExecuteScriptOptions().SetEnableIO(false));
  return error;
}

Error ScriptInterpreterPython::GenerateFunction(const char *signature,
                                                const StringList &input) {
  Error error;
  int num_lines = input.GetSize();
  if (num_lines == 0) {
    error.SetErrorString("No input data.");
    return error;
  }

  if (!signature || *signature == 0) {
    error.SetErrorString("No output function name.");
    return error;
  }

  StreamString sstr;
  StringList auto_generated_function;
  auto_generated_function.AppendString(signature);
  auto_generated_function.AppendString(
      "     global_dict = globals()"); // Grab the global dictionary
  auto_generated_function.AppendString(
      "     new_keys = internal_dict.keys()"); // Make a list of keys in the
                                               // session dict
  auto_generated_function.AppendString(
      "     old_keys = global_dict.keys()"); // Save list of keys in global dict
  auto_generated_function.AppendString(
      "     global_dict.update (internal_dict)"); // Add the session dictionary
                                                  // to the
  // global dictionary.

  // Wrap everything up inside the function, increasing the indentation.

  auto_generated_function.AppendString("     if True:");
  for (int i = 0; i < num_lines; ++i) {
    sstr.Clear();
    sstr.Printf("       %s", input.GetStringAtIndex(i));
    auto_generated_function.AppendString(sstr.GetData());
  }
  auto_generated_function.AppendString(
      "     for key in new_keys:"); // Iterate over all the keys from session
                                    // dict
  auto_generated_function.AppendString(
      "         internal_dict[key] = global_dict[key]"); // Update session dict
                                                         // values
  auto_generated_function.AppendString(
      "         if key not in old_keys:"); // If key was not originally in
                                           // global dict
  auto_generated_function.AppendString(
      "             del global_dict[key]"); //  ...then remove key/value from
                                            //  global dict

  // Verify that the results are valid Python.

  error = ExportFunctionDefinitionToInterpreter(auto_generated_function);

  return error;
}

bool ScriptInterpreterPython::GenerateTypeScriptFunction(
    StringList &user_input, std::string &output, const void *name_token) {
  static uint32_t num_created_functions = 0;
  user_input.RemoveBlankLines();
  StreamString sstr;

  // Check to see if we have any data; if not, just return.
  if (user_input.GetSize() == 0)
    return false;

  // Take what the user wrote, wrap it all up inside one big auto-generated
  // Python function, passing in the
  // ValueObject as parameter to the function.

  std::string auto_generated_function_name(
      GenerateUniqueName("lldb_autogen_python_type_print_func",
                         num_created_functions, name_token));
  sstr.Printf("def %s (valobj, internal_dict):",
              auto_generated_function_name.c_str());

  if (!GenerateFunction(sstr.GetData(), user_input).Success())
    return false;

  // Store the name of the auto-generated function to be called.
  output.assign(auto_generated_function_name);
  return true;
}

bool ScriptInterpreterPython::GenerateScriptAliasFunction(
    StringList &user_input, std::string &output) {
  static uint32_t num_created_functions = 0;
  user_input.RemoveBlankLines();
  StreamString sstr;

  // Check to see if we have any data; if not, just return.
  if (user_input.GetSize() == 0)
    return false;

  std::string auto_generated_function_name(GenerateUniqueName(
      "lldb_autogen_python_cmd_alias_func", num_created_functions));

  sstr.Printf("def %s (debugger, args, result, internal_dict):",
              auto_generated_function_name.c_str());

  if (!GenerateFunction(sstr.GetData(), user_input).Success())
    return false;

  // Store the name of the auto-generated function to be called.
  output.assign(auto_generated_function_name);
  return true;
}

bool ScriptInterpreterPython::GenerateTypeSynthClass(StringList &user_input,
                                                     std::string &output,
                                                     const void *name_token) {
  static uint32_t num_created_classes = 0;
  user_input.RemoveBlankLines();
  int num_lines = user_input.GetSize();
  StreamString sstr;

  // Check to see if we have any data; if not, just return.
  if (user_input.GetSize() == 0)
    return false;

  // Wrap all user input into a Python class

  std::string auto_generated_class_name(GenerateUniqueName(
      "lldb_autogen_python_type_synth_class", num_created_classes, name_token));

  StringList auto_generated_class;

  // Create the function name & definition string.

  sstr.Printf("class %s:", auto_generated_class_name.c_str());
  auto_generated_class.AppendString(sstr.GetData());

  // Wrap everything up inside the class, increasing the indentation.
  // we don't need to play any fancy indentation tricks here because there is no
  // surrounding code whose indentation we need to honor
  for (int i = 0; i < num_lines; ++i) {
    sstr.Clear();
    sstr.Printf("     %s", user_input.GetStringAtIndex(i));
    auto_generated_class.AppendString(sstr.GetData());
  }

  // Verify that the results are valid Python.
  // (even though the method is ExportFunctionDefinitionToInterpreter, a class
  // will actually be exported)
  // (TODO: rename that method to ExportDefinitionToInterpreter)
  if (!ExportFunctionDefinitionToInterpreter(auto_generated_class).Success())
    return false;

  // Store the name of the auto-generated class

  output.assign(auto_generated_class_name);
  return true;
}

StructuredData::GenericSP ScriptInterpreterPython::OSPlugin_CreatePluginObject(
    const char *class_name, lldb::ProcessSP process_sp) {
  if (class_name == nullptr || class_name[0] == '\0')
    return StructuredData::GenericSP();

  if (!process_sp)
    return StructuredData::GenericSP();

  void *ret_val;

  {
    Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN,
                   Locker::FreeLock);
    ret_val = g_swig_create_os_plugin(class_name, m_dictionary_name.c_str(),
                                      process_sp);
  }

  return StructuredData::GenericSP(new StructuredPythonObject(ret_val));
}

StructuredData::DictionarySP ScriptInterpreterPython::OSPlugin_RegisterInfo(
    StructuredData::ObjectSP os_plugin_object_sp) {
  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_register_info";

  if (!os_plugin_object_sp)
    return StructuredData::DictionarySP();

  StructuredData::Generic *generic = os_plugin_object_sp->GetAsGeneric();
  if (!generic)
    return nullptr;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)generic->GetValue());

  if (!implementor.IsAllocated())
    return StructuredData::DictionarySP();

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return StructuredData::DictionarySP();

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();

    return StructuredData::DictionarySP();
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }
  if (py_return.get()) {
    PythonDictionary result_dict(PyRefType::Borrowed, py_return.get());
    return result_dict.CreateStructuredDictionary();
  }
  return StructuredData::DictionarySP();
}

StructuredData::ArraySP ScriptInterpreterPython::OSPlugin_ThreadsInfo(
    StructuredData::ObjectSP os_plugin_object_sp) {
  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_thread_info";

  if (!os_plugin_object_sp)
    return StructuredData::ArraySP();

  StructuredData::Generic *generic = os_plugin_object_sp->GetAsGeneric();
  if (!generic)
    return nullptr;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)generic->GetValue());

  if (!implementor.IsAllocated())
    return StructuredData::ArraySP();

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return StructuredData::ArraySP();

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();

    return StructuredData::ArraySP();
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.get()) {
    PythonList result_list(PyRefType::Borrowed, py_return.get());
    return result_list.CreateStructuredArray();
  }
  return StructuredData::ArraySP();
}

// GetPythonValueFormatString provides a system independent type safe way to
// convert a variable's type into a python value format. Python value formats
// are defined in terms of builtin C types and could change from system to
// as the underlying typedef for uint* types, size_t, off_t and other values
// change.

template <typename T> const char *GetPythonValueFormatString(T t) {
  assert(!"Unhandled type passed to GetPythonValueFormatString(T), make a "
          "specialization of GetPythonValueFormatString() to support this "
          "type.");
  return nullptr;
}
template <> const char *GetPythonValueFormatString(char *) { return "s"; }
template <> const char *GetPythonValueFormatString(char) { return "b"; }
template <> const char *GetPythonValueFormatString(unsigned char) {
  return "B";
}
template <> const char *GetPythonValueFormatString(short) { return "h"; }
template <> const char *GetPythonValueFormatString(unsigned short) {
  return "H";
}
template <> const char *GetPythonValueFormatString(int) { return "i"; }
template <> const char *GetPythonValueFormatString(unsigned int) { return "I"; }
template <> const char *GetPythonValueFormatString(long) { return "l"; }
template <> const char *GetPythonValueFormatString(unsigned long) {
  return "k";
}
template <> const char *GetPythonValueFormatString(long long) { return "L"; }
template <> const char *GetPythonValueFormatString(unsigned long long) {
  return "K";
}
template <> const char *GetPythonValueFormatString(float t) { return "f"; }
template <> const char *GetPythonValueFormatString(double t) { return "d"; }

StructuredData::StringSP ScriptInterpreterPython::OSPlugin_RegisterContextData(
    StructuredData::ObjectSP os_plugin_object_sp, lldb::tid_t tid) {
  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_register_data";
  static char *param_format =
      const_cast<char *>(GetPythonValueFormatString(tid));

  if (!os_plugin_object_sp)
    return StructuredData::StringSP();

  StructuredData::Generic *generic = os_plugin_object_sp->GetAsGeneric();
  if (!generic)
    return nullptr;
  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)generic->GetValue());

  if (!implementor.IsAllocated())
    return StructuredData::StringSP();

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return StructuredData::StringSP();

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();
    return StructuredData::StringSP();
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, param_format, tid));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.get()) {
    PythonBytes result(PyRefType::Borrowed, py_return.get());
    return result.CreateStructuredString();
  }
  return StructuredData::StringSP();
}

StructuredData::DictionarySP ScriptInterpreterPython::OSPlugin_CreateThread(
    StructuredData::ObjectSP os_plugin_object_sp, lldb::tid_t tid,
    lldb::addr_t context) {
  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "create_thread";
  std::string param_format;
  param_format += GetPythonValueFormatString(tid);
  param_format += GetPythonValueFormatString(context);

  if (!os_plugin_object_sp)
    return StructuredData::DictionarySP();

  StructuredData::Generic *generic = os_plugin_object_sp->GetAsGeneric();
  if (!generic)
    return nullptr;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)generic->GetValue());

  if (!implementor.IsAllocated())
    return StructuredData::DictionarySP();

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return StructuredData::DictionarySP();

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();
    return StructuredData::DictionarySP();
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(PyRefType::Owned,
                         PyObject_CallMethod(implementor.get(), callee_name,
                                             &param_format[0], tid, context));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.get()) {
    PythonDictionary result_dict(PyRefType::Borrowed, py_return.get());
    return result_dict.CreateStructuredDictionary();
  }
  return StructuredData::DictionarySP();
}

StructuredData::ObjectSP ScriptInterpreterPython::CreateScriptedThreadPlan(
    const char *class_name, lldb::ThreadPlanSP thread_plan_sp) {
  if (class_name == nullptr || class_name[0] == '\0')
    return StructuredData::ObjectSP();

  if (!thread_plan_sp.get())
    return StructuredData::ObjectSP();

  Debugger &debugger = thread_plan_sp->GetTarget().GetDebugger();
  ScriptInterpreter *script_interpreter =
      debugger.GetCommandInterpreter().GetScriptInterpreter();
  ScriptInterpreterPython *python_interpreter =
      static_cast<ScriptInterpreterPython *>(script_interpreter);

  if (!script_interpreter)
    return StructuredData::ObjectSP();

  void *ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);

    ret_val = g_swig_thread_plan_script(
        class_name, python_interpreter->m_dictionary_name.c_str(),
        thread_plan_sp);
  }

  return StructuredData::ObjectSP(new StructuredPythonObject(ret_val));
}

bool ScriptInterpreterPython::ScriptedThreadPlanExplainsStop(
    StructuredData::ObjectSP implementor_sp, Event *event, bool &script_error) {
  bool explains_stop = true;
  StructuredData::Generic *generic = nullptr;
  if (implementor_sp)
    generic = implementor_sp->GetAsGeneric();
  if (generic) {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    explains_stop = g_swig_call_thread_plan(
        generic->GetValue(), "explains_stop", event, script_error);
    if (script_error)
      return true;
  }
  return explains_stop;
}

bool ScriptInterpreterPython::ScriptedThreadPlanShouldStop(
    StructuredData::ObjectSP implementor_sp, Event *event, bool &script_error) {
  bool should_stop = true;
  StructuredData::Generic *generic = nullptr;
  if (implementor_sp)
    generic = implementor_sp->GetAsGeneric();
  if (generic) {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    should_stop = g_swig_call_thread_plan(generic->GetValue(), "should_stop",
                                          event, script_error);
    if (script_error)
      return true;
  }
  return should_stop;
}

bool ScriptInterpreterPython::ScriptedThreadPlanIsStale(
    StructuredData::ObjectSP implementor_sp, bool &script_error) {
  bool is_stale = true;
  StructuredData::Generic *generic = nullptr;
  if (implementor_sp)
    generic = implementor_sp->GetAsGeneric();
  if (generic) {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    is_stale = g_swig_call_thread_plan(generic->GetValue(), "is_stale", nullptr,
                                       script_error);
    if (script_error)
      return true;
  }
  return is_stale;
}

lldb::StateType ScriptInterpreterPython::ScriptedThreadPlanGetRunState(
    StructuredData::ObjectSP implementor_sp, bool &script_error) {
  bool should_step = false;
  StructuredData::Generic *generic = nullptr;
  if (implementor_sp)
    generic = implementor_sp->GetAsGeneric();
  if (generic) {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    should_step = g_swig_call_thread_plan(generic->GetValue(), "should_step",
                                          NULL, script_error);
    if (script_error)
      should_step = true;
  }
  if (should_step)
    return lldb::eStateStepping;
  else
    return lldb::eStateRunning;
}

StructuredData::ObjectSP
ScriptInterpreterPython::LoadPluginModule(const FileSpec &file_spec,
                                          lldb_private::Error &error) {
  if (!file_spec.Exists()) {
    error.SetErrorString("no such file");
    return StructuredData::ObjectSP();
  }

  StructuredData::ObjectSP module_sp;

  if (LoadScriptingModule(file_spec.GetPath().c_str(), true, true, error,
                          &module_sp))
    return module_sp;

  return StructuredData::ObjectSP();
}

StructuredData::DictionarySP ScriptInterpreterPython::GetDynamicSettings(
    StructuredData::ObjectSP plugin_module_sp, Target *target,
    const char *setting_name, lldb_private::Error &error) {
  if (!plugin_module_sp || !target || !setting_name || !setting_name[0] ||
      !g_swig_plugin_get)
    return StructuredData::DictionarySP();
  StructuredData::Generic *generic = plugin_module_sp->GetAsGeneric();
  if (!generic)
    return StructuredData::DictionarySP();

  PythonObject reply_pyobj;
  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    TargetSP target_sp(target->shared_from_this());
    reply_pyobj.Reset(PyRefType::Owned,
                      (PyObject *)g_swig_plugin_get(generic->GetValue(),
                                                    setting_name, target_sp));
  }

  PythonDictionary py_dict(PyRefType::Borrowed, reply_pyobj.get());
  return py_dict.CreateStructuredDictionary();
}

StructuredData::ObjectSP
ScriptInterpreterPython::CreateSyntheticScriptedProvider(
    const char *class_name, lldb::ValueObjectSP valobj) {
  if (class_name == nullptr || class_name[0] == '\0')
    return StructuredData::ObjectSP();

  if (!valobj.get())
    return StructuredData::ObjectSP();

  ExecutionContext exe_ctx(valobj->GetExecutionContextRef());
  Target *target = exe_ctx.GetTargetPtr();

  if (!target)
    return StructuredData::ObjectSP();

  Debugger &debugger = target->GetDebugger();
  ScriptInterpreter *script_interpreter =
      debugger.GetCommandInterpreter().GetScriptInterpreter();
  ScriptInterpreterPython *python_interpreter =
      (ScriptInterpreterPython *)script_interpreter;

  if (!script_interpreter)
    return StructuredData::ObjectSP();

  void *ret_val = nullptr;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_synthetic_script(
        class_name, python_interpreter->m_dictionary_name.c_str(), valobj);
  }

  return StructuredData::ObjectSP(new StructuredPythonObject(ret_val));
}

StructuredData::GenericSP
ScriptInterpreterPython::CreateScriptCommandObject(const char *class_name) {
  DebuggerSP debugger_sp(
      GetCommandInterpreter().GetDebugger().shared_from_this());

  if (class_name == nullptr || class_name[0] == '\0')
    return StructuredData::GenericSP();

  if (!debugger_sp.get())
    return StructuredData::GenericSP();

  void *ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val =
        g_swig_create_cmd(class_name, m_dictionary_name.c_str(), debugger_sp);
  }

  return StructuredData::GenericSP(new StructuredPythonObject(ret_val));
}

bool ScriptInterpreterPython::GenerateTypeScriptFunction(
    const char *oneliner, std::string &output, const void *name_token) {
  StringList input;
  input.SplitIntoLines(oneliner, strlen(oneliner));
  return GenerateTypeScriptFunction(input, output, name_token);
}

bool ScriptInterpreterPython::GenerateTypeSynthClass(const char *oneliner,
                                                     std::string &output,
                                                     const void *name_token) {
  StringList input;
  input.SplitIntoLines(oneliner, strlen(oneliner));
  return GenerateTypeSynthClass(input, output, name_token);
}

Error ScriptInterpreterPython::GenerateBreakpointCommandCallbackData(
    StringList &user_input, std::string &output) {
  static uint32_t num_created_functions = 0;
  user_input.RemoveBlankLines();
  StreamString sstr;
  Error error;
  if (user_input.GetSize() == 0) {
    error.SetErrorString("No input data.");
    return error;
  }

  std::string auto_generated_function_name(GenerateUniqueName(
      "lldb_autogen_python_bp_callback_func_", num_created_functions));
  sstr.Printf("def %s (frame, bp_loc, internal_dict):",
              auto_generated_function_name.c_str());

  error = GenerateFunction(sstr.GetData(), user_input);
  if (!error.Success())
    return error;

  // Store the name of the auto-generated function to be called.
  output.assign(auto_generated_function_name);
  return error;
}

bool ScriptInterpreterPython::GenerateWatchpointCommandCallbackData(
    StringList &user_input, std::string &output) {
  static uint32_t num_created_functions = 0;
  user_input.RemoveBlankLines();
  StreamString sstr;

  if (user_input.GetSize() == 0)
    return false;

  std::string auto_generated_function_name(GenerateUniqueName(
      "lldb_autogen_python_wp_callback_func_", num_created_functions));
  sstr.Printf("def %s (frame, wp, internal_dict):",
              auto_generated_function_name.c_str());

  if (!GenerateFunction(sstr.GetData(), user_input).Success())
    return false;

  // Store the name of the auto-generated function to be called.
  output.assign(auto_generated_function_name);
  return true;
}

bool ScriptInterpreterPython::GetScriptedSummary(
    const char *python_function_name, lldb::ValueObjectSP valobj,
    StructuredData::ObjectSP &callee_wrapper_sp,
    const TypeSummaryOptions &options, std::string &retval) {

  Timer scoped_timer(LLVM_PRETTY_FUNCTION, LLVM_PRETTY_FUNCTION);

  if (!valobj.get()) {
    retval.assign("<no object>");
    return false;
  }

  void *old_callee = nullptr;
  StructuredData::Generic *generic = nullptr;
  if (callee_wrapper_sp) {
    generic = callee_wrapper_sp->GetAsGeneric();
    if (generic)
      old_callee = generic->GetValue();
  }
  void *new_callee = old_callee;

  bool ret_val;
  if (python_function_name && *python_function_name) {
    {
      Locker py_lock(this, Locker::AcquireLock | Locker::InitSession |
                               Locker::NoSTDIN);
      {
        TypeSummaryOptionsSP options_sp(new TypeSummaryOptions(options));

        Timer scoped_timer("g_swig_typescript_callback",
                           "g_swig_typescript_callback");
        ret_val = g_swig_typescript_callback(
            python_function_name, GetSessionDictionary().get(), valobj,
            &new_callee, options_sp, retval);
      }
    }
  } else {
    retval.assign("<no function name>");
    return false;
  }

  if (new_callee && old_callee != new_callee)
    callee_wrapper_sp.reset(new StructuredPythonObject(new_callee));

  return ret_val;
}

void ScriptInterpreterPython::Clear() {
  // Release any global variables that might have strong references to
  // LLDB objects when clearing the python script interpreter.
  Locker locker(this, ScriptInterpreterPython::Locker::AcquireLock,
                ScriptInterpreterPython::Locker::FreeAcquiredLock);

  // This may be called as part of Py_Finalize.  In that case the modules are
  // destroyed in random
  // order and we can't guarantee that we can access these.
  if (Py_IsInitialized())
    PyRun_SimpleString("lldb.debugger = None; lldb.target = None; lldb.process "
                       "= None; lldb.thread = None; lldb.frame = None");
}

bool ScriptInterpreterPython::BreakpointCallbackFunction(
    void *baton, StoppointCallbackContext *context, user_id_t break_id,
    user_id_t break_loc_id) {
  BreakpointOptions::CommandData *bp_option_data =
      (BreakpointOptions::CommandData *)baton;
  const char *python_function_name = bp_option_data->script_source.c_str();

  if (!context)
    return true;

  ExecutionContext exe_ctx(context->exe_ctx_ref);
  Target *target = exe_ctx.GetTargetPtr();

  if (!target)
    return true;

  Debugger &debugger = target->GetDebugger();
  ScriptInterpreter *script_interpreter =
      debugger.GetCommandInterpreter().GetScriptInterpreter();
  ScriptInterpreterPython *python_interpreter =
      (ScriptInterpreterPython *)script_interpreter;

  if (!script_interpreter)
    return true;

  if (python_function_name && python_function_name[0]) {
    const StackFrameSP stop_frame_sp(exe_ctx.GetFrameSP());
    BreakpointSP breakpoint_sp = target->GetBreakpointByID(break_id);
    if (breakpoint_sp) {
      const BreakpointLocationSP bp_loc_sp(
          breakpoint_sp->FindLocationByID(break_loc_id));

      if (stop_frame_sp && bp_loc_sp) {
        bool ret_val = true;
        {
          Locker py_lock(python_interpreter, Locker::AcquireLock |
                                                 Locker::InitSession |
                                                 Locker::NoSTDIN);
          ret_val = g_swig_breakpoint_callback(
              python_function_name,
              python_interpreter->m_dictionary_name.c_str(), stop_frame_sp,
              bp_loc_sp);
        }
        return ret_val;
      }
    }
  }
  // We currently always true so we stop in case anything goes wrong when
  // trying to call the script function
  return true;
}

bool ScriptInterpreterPython::WatchpointCallbackFunction(
    void *baton, StoppointCallbackContext *context, user_id_t watch_id) {
  WatchpointOptions::CommandData *wp_option_data =
      (WatchpointOptions::CommandData *)baton;
  const char *python_function_name = wp_option_data->script_source.c_str();

  if (!context)
    return true;

  ExecutionContext exe_ctx(context->exe_ctx_ref);
  Target *target = exe_ctx.GetTargetPtr();

  if (!target)
    return true;

  Debugger &debugger = target->GetDebugger();
  ScriptInterpreter *script_interpreter =
      debugger.GetCommandInterpreter().GetScriptInterpreter();
  ScriptInterpreterPython *python_interpreter =
      (ScriptInterpreterPython *)script_interpreter;

  if (!script_interpreter)
    return true;

  if (python_function_name && python_function_name[0]) {
    const StackFrameSP stop_frame_sp(exe_ctx.GetFrameSP());
    WatchpointSP wp_sp = target->GetWatchpointList().FindByID(watch_id);
    if (wp_sp) {
      if (stop_frame_sp && wp_sp) {
        bool ret_val = true;
        {
          Locker py_lock(python_interpreter, Locker::AcquireLock |
                                                 Locker::InitSession |
                                                 Locker::NoSTDIN);
          ret_val = g_swig_watchpoint_callback(
              python_function_name,
              python_interpreter->m_dictionary_name.c_str(), stop_frame_sp,
              wp_sp);
        }
        return ret_val;
      }
    }
  }
  // We currently always true so we stop in case anything goes wrong when
  // trying to call the script function
  return true;
}

size_t ScriptInterpreterPython::CalculateNumChildren(
    const StructuredData::ObjectSP &implementor_sp, uint32_t max) {
  if (!implementor_sp)
    return 0;
  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return 0;
  void *implementor = generic->GetValue();
  if (!implementor)
    return 0;

  if (!g_swig_calc_children)
    return 0;

  size_t ret_val = 0;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_calc_children(implementor, max);
  }

  return ret_val;
}

lldb::ValueObjectSP ScriptInterpreterPython::GetChildAtIndex(
    const StructuredData::ObjectSP &implementor_sp, uint32_t idx) {
  if (!implementor_sp)
    return lldb::ValueObjectSP();

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return lldb::ValueObjectSP();
  void *implementor = generic->GetValue();
  if (!implementor)
    return lldb::ValueObjectSP();

  if (!g_swig_get_child_index || !g_swig_cast_to_sbvalue)
    return lldb::ValueObjectSP();

  lldb::ValueObjectSP ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    void *child_ptr = g_swig_get_child_index(implementor, idx);
    if (child_ptr != nullptr && child_ptr != Py_None) {
      lldb::SBValue *sb_value_ptr =
          (lldb::SBValue *)g_swig_cast_to_sbvalue(child_ptr);
      if (sb_value_ptr == nullptr)
        Py_XDECREF(child_ptr);
      else
        ret_val = g_swig_get_valobj_sp_from_sbvalue(sb_value_ptr);
    } else {
      Py_XDECREF(child_ptr);
    }
  }

  return ret_val;
}

int ScriptInterpreterPython::GetIndexOfChildWithName(
    const StructuredData::ObjectSP &implementor_sp, const char *child_name) {
  if (!implementor_sp)
    return UINT32_MAX;

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return UINT32_MAX;
  void *implementor = generic->GetValue();
  if (!implementor)
    return UINT32_MAX;

  if (!g_swig_get_index_child)
    return UINT32_MAX;

  int ret_val = UINT32_MAX;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_get_index_child(implementor, child_name);
  }

  return ret_val;
}

bool ScriptInterpreterPython::UpdateSynthProviderInstance(
    const StructuredData::ObjectSP &implementor_sp) {
  bool ret_val = false;

  if (!implementor_sp)
    return ret_val;

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return ret_val;
  void *implementor = generic->GetValue();
  if (!implementor)
    return ret_val;

  if (!g_swig_update_provider)
    return ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_update_provider(implementor);
  }

  return ret_val;
}

bool ScriptInterpreterPython::MightHaveChildrenSynthProviderInstance(
    const StructuredData::ObjectSP &implementor_sp) {
  bool ret_val = false;

  if (!implementor_sp)
    return ret_val;

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return ret_val;
  void *implementor = generic->GetValue();
  if (!implementor)
    return ret_val;

  if (!g_swig_mighthavechildren_provider)
    return ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_mighthavechildren_provider(implementor);
  }

  return ret_val;
}

lldb::ValueObjectSP ScriptInterpreterPython::GetSyntheticValue(
    const StructuredData::ObjectSP &implementor_sp) {
  lldb::ValueObjectSP ret_val(nullptr);

  if (!implementor_sp)
    return ret_val;

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return ret_val;
  void *implementor = generic->GetValue();
  if (!implementor)
    return ret_val;

  if (!g_swig_getvalue_provider || !g_swig_cast_to_sbvalue ||
      !g_swig_get_valobj_sp_from_sbvalue)
    return ret_val;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    void *child_ptr = g_swig_getvalue_provider(implementor);
    if (child_ptr != nullptr && child_ptr != Py_None) {
      lldb::SBValue *sb_value_ptr =
          (lldb::SBValue *)g_swig_cast_to_sbvalue(child_ptr);
      if (sb_value_ptr == nullptr)
        Py_XDECREF(child_ptr);
      else
        ret_val = g_swig_get_valobj_sp_from_sbvalue(sb_value_ptr);
    } else {
      Py_XDECREF(child_ptr);
    }
  }

  return ret_val;
}

ConstString ScriptInterpreterPython::GetSyntheticTypeName(
    const StructuredData::ObjectSP &implementor_sp) {
  Locker py_lock(this,
                 Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);

  static char callee_name[] = "get_type_name";

  ConstString ret_val;
  bool got_string = false;
  std::string buffer;

  if (!implementor_sp)
    return ret_val;

  StructuredData::Generic *generic = implementor_sp->GetAsGeneric();
  if (!generic)
    return ret_val;
  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)generic->GetValue());
  if (!implementor.IsAllocated())
    return ret_val;

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return ret_val;

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();
    return ret_val;
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.IsAllocated() && PythonString::Check(py_return.get())) {
    PythonString py_string(PyRefType::Borrowed, py_return.get());
    llvm::StringRef return_data(py_string.GetString());
    if (!return_data.empty()) {
      buffer.assign(return_data.data(), return_data.size());
      got_string = true;
    }
  }

  if (got_string)
    ret_val.SetCStringWithLength(buffer.c_str(), buffer.size());

  return ret_val;
}

bool ScriptInterpreterPython::RunScriptFormatKeyword(const char *impl_function,
                                                     Process *process,
                                                     std::string &output,
                                                     Error &error) {
  bool ret_val;
  if (!process) {
    error.SetErrorString("no process");
    return false;
  }
  if (!impl_function || !impl_function[0]) {
    error.SetErrorString("no function to execute");
    return false;
  }
  if (!g_swig_run_script_keyword_process) {
    error.SetErrorString("internal helper function missing");
    return false;
  }
  {
    ProcessSP process_sp(process->shared_from_this());
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_run_script_keyword_process(
        impl_function, m_dictionary_name.c_str(), process_sp, output);
    if (!ret_val)
      error.SetErrorString("python script evaluation failed");
  }
  return ret_val;
}

bool ScriptInterpreterPython::RunScriptFormatKeyword(const char *impl_function,
                                                     Thread *thread,
                                                     std::string &output,
                                                     Error &error) {
  bool ret_val;
  if (!thread) {
    error.SetErrorString("no thread");
    return false;
  }
  if (!impl_function || !impl_function[0]) {
    error.SetErrorString("no function to execute");
    return false;
  }
  if (!g_swig_run_script_keyword_thread) {
    error.SetErrorString("internal helper function missing");
    return false;
  }
  {
    ThreadSP thread_sp(thread->shared_from_this());
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_run_script_keyword_thread(
        impl_function, m_dictionary_name.c_str(), thread_sp, output);
    if (!ret_val)
      error.SetErrorString("python script evaluation failed");
  }
  return ret_val;
}

bool ScriptInterpreterPython::RunScriptFormatKeyword(const char *impl_function,
                                                     Target *target,
                                                     std::string &output,
                                                     Error &error) {
  bool ret_val;
  if (!target) {
    error.SetErrorString("no thread");
    return false;
  }
  if (!impl_function || !impl_function[0]) {
    error.SetErrorString("no function to execute");
    return false;
  }
  if (!g_swig_run_script_keyword_target) {
    error.SetErrorString("internal helper function missing");
    return false;
  }
  {
    TargetSP target_sp(target->shared_from_this());
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_run_script_keyword_target(
        impl_function, m_dictionary_name.c_str(), target_sp, output);
    if (!ret_val)
      error.SetErrorString("python script evaluation failed");
  }
  return ret_val;
}

bool ScriptInterpreterPython::RunScriptFormatKeyword(const char *impl_function,
                                                     StackFrame *frame,
                                                     std::string &output,
                                                     Error &error) {
  bool ret_val;
  if (!frame) {
    error.SetErrorString("no frame");
    return false;
  }
  if (!impl_function || !impl_function[0]) {
    error.SetErrorString("no function to execute");
    return false;
  }
  if (!g_swig_run_script_keyword_frame) {
    error.SetErrorString("internal helper function missing");
    return false;
  }
  {
    StackFrameSP frame_sp(frame->shared_from_this());
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_run_script_keyword_frame(
        impl_function, m_dictionary_name.c_str(), frame_sp, output);
    if (!ret_val)
      error.SetErrorString("python script evaluation failed");
  }
  return ret_val;
}

bool ScriptInterpreterPython::RunScriptFormatKeyword(const char *impl_function,
                                                     ValueObject *value,
                                                     std::string &output,
                                                     Error &error) {
  bool ret_val;
  if (!value) {
    error.SetErrorString("no value");
    return false;
  }
  if (!impl_function || !impl_function[0]) {
    error.SetErrorString("no function to execute");
    return false;
  }
  if (!g_swig_run_script_keyword_value) {
    error.SetErrorString("internal helper function missing");
    return false;
  }
  {
    ValueObjectSP value_sp(value->GetSP());
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN);
    ret_val = g_swig_run_script_keyword_value(
        impl_function, m_dictionary_name.c_str(), value_sp, output);
    if (!ret_val)
      error.SetErrorString("python script evaluation failed");
  }
  return ret_val;
}

uint64_t replace_all(std::string &str, const std::string &oldStr,
                     const std::string &newStr) {
  size_t pos = 0;
  uint64_t matches = 0;
  while ((pos = str.find(oldStr, pos)) != std::string::npos) {
    matches++;
    str.replace(pos, oldStr.length(), newStr);
    pos += newStr.length();
  }
  return matches;
}

bool ScriptInterpreterPython::LoadScriptingModule(
    const char *pathname, bool can_reload, bool init_session,
    lldb_private::Error &error, StructuredData::ObjectSP *module_sp) {
  if (!pathname || !pathname[0]) {
    error.SetErrorString("invalid pathname");
    return false;
  }

  if (!g_swig_call_module_init) {
    error.SetErrorString("internal helper function missing");
    return false;
  }

  lldb::DebuggerSP debugger_sp = m_interpreter.GetDebugger().shared_from_this();

  {
    FileSpec target_file(pathname, true);
    std::string basename(target_file.GetFilename().GetCString());

    StreamString command_stream;

    // Before executing Python code, lock the GIL.
    Locker py_lock(this, Locker::AcquireLock |
                             (init_session ? Locker::InitSession : 0) |
                             Locker::NoSTDIN,
                   Locker::FreeAcquiredLock |
                       (init_session ? Locker::TearDownSession : 0));

    if (target_file.GetFileType() == FileSpec::eFileTypeInvalid ||
        target_file.GetFileType() == FileSpec::eFileTypeUnknown) {
      // if not a valid file of any sort, check if it might be a filename still
      // dot can't be used but / and \ can, and if either is found, reject
      if (strchr(pathname, '\\') || strchr(pathname, '/')) {
        error.SetErrorString("invalid pathname");
        return false;
      }
      basename = pathname; // not a filename, probably a package of some sort,
                           // let it go through
    } else if (target_file.GetFileType() == FileSpec::eFileTypeDirectory ||
               target_file.GetFileType() == FileSpec::eFileTypeRegular ||
               target_file.GetFileType() == FileSpec::eFileTypeSymbolicLink) {
      std::string directory = target_file.GetDirectory().GetCString();
      replace_all(directory, "\\", "\\\\");
      replace_all(directory, "'", "\\'");

      // now make sure that Python has "directory" in the search path
      StreamString command_stream;
      command_stream.Printf("if not (sys.path.__contains__('%s')):\n    "
                            "sys.path.insert(1,'%s');\n\n",
                            directory.c_str(), directory.c_str());
      bool syspath_retval =
          ExecuteMultipleLines(command_stream.GetData(),
                               ScriptInterpreter::ExecuteScriptOptions()
                                   .SetEnableIO(false)
                                   .SetSetLLDBGlobals(false))
              .Success();
      if (!syspath_retval) {
        error.SetErrorString("Python sys.path handling failed");
        return false;
      }

      // strip .py or .pyc extension
      ConstString extension = target_file.GetFileNameExtension();
      if (extension) {
        if (::strcmp(extension.GetCString(), "py") == 0)
          basename.resize(basename.length() - 3);
        else if (::strcmp(extension.GetCString(), "pyc") == 0)
          basename.resize(basename.length() - 4);
      }
    } else {
      error.SetErrorString("no known way to import this module specification");
      return false;
    }

    // check if the module is already import-ed
    command_stream.Clear();
    command_stream.Printf("sys.modules.__contains__('%s')", basename.c_str());
    bool does_contain = false;
    // this call will succeed if the module was ever imported in any Debugger in
    // the lifetime of the process
    // in which this LLDB framework is living
    bool was_imported_globally =
        (ExecuteOneLineWithReturn(
             command_stream.GetData(),
             ScriptInterpreterPython::eScriptReturnTypeBool, &does_contain,
             ScriptInterpreter::ExecuteScriptOptions()
                 .SetEnableIO(false)
                 .SetSetLLDBGlobals(false)) &&
         does_contain);
    // this call will fail if the module was not imported in this Debugger
    // before
    command_stream.Clear();
    command_stream.Printf("sys.getrefcount(%s)", basename.c_str());
    bool was_imported_locally = GetSessionDictionary()
                                    .GetItemForKey(PythonString(basename))
                                    .IsAllocated();

    bool was_imported = (was_imported_globally || was_imported_locally);

    if (was_imported == true && can_reload == false) {
      error.SetErrorString("module already imported");
      return false;
    }

    // now actually do the import
    command_stream.Clear();

    if (was_imported) {
      if (!was_imported_locally)
        command_stream.Printf("import %s ; reload_module(%s)", basename.c_str(),
                              basename.c_str());
      else
        command_stream.Printf("reload_module(%s)", basename.c_str());
    } else
      command_stream.Printf("import %s", basename.c_str());

    error = ExecuteMultipleLines(command_stream.GetData(),
                                 ScriptInterpreter::ExecuteScriptOptions()
                                     .SetEnableIO(false)
                                     .SetSetLLDBGlobals(false));
    if (error.Fail())
      return false;

    // if we are here, everything worked
    // call __lldb_init_module(debugger,dict)
    if (!g_swig_call_module_init(basename.c_str(), m_dictionary_name.c_str(),
                                 debugger_sp)) {
      error.SetErrorString("calling __lldb_init_module failed");
      return false;
    }

    if (module_sp) {
      // everything went just great, now set the module object
      command_stream.Clear();
      command_stream.Printf("%s", basename.c_str());
      void *module_pyobj = nullptr;
      if (ExecuteOneLineWithReturn(
              command_stream.GetData(),
              ScriptInterpreter::eScriptReturnTypeOpaqueObject,
              &module_pyobj) &&
          module_pyobj)
        module_sp->reset(new StructuredPythonObject(module_pyobj));
    }

    return true;
  }
}

bool ScriptInterpreterPython::IsReservedWord(const char *word) {
  if (!word || !word[0])
    return false;

  llvm::StringRef word_sr(word);

  // filter out a few characters that would just confuse us
  // and that are clearly not keyword material anyway
  if (word_sr.find_first_of("'\"") != llvm::StringRef::npos)
    return false;

  StreamString command_stream;
  command_stream.Printf("keyword.iskeyword('%s')", word);
  bool result;
  ExecuteScriptOptions options;
  options.SetEnableIO(false);
  options.SetMaskoutErrors(true);
  options.SetSetLLDBGlobals(false);
  if (ExecuteOneLineWithReturn(command_stream.GetData(),
                               ScriptInterpreter::eScriptReturnTypeBool,
                               &result, options))
    return result;
  return false;
}

ScriptInterpreterPython::SynchronicityHandler::SynchronicityHandler(
    lldb::DebuggerSP debugger_sp, ScriptedCommandSynchronicity synchro)
    : m_debugger_sp(debugger_sp), m_synch_wanted(synchro),
      m_old_asynch(debugger_sp->GetAsyncExecution()) {
  if (m_synch_wanted == eScriptedCommandSynchronicitySynchronous)
    m_debugger_sp->SetAsyncExecution(false);
  else if (m_synch_wanted == eScriptedCommandSynchronicityAsynchronous)
    m_debugger_sp->SetAsyncExecution(true);
}

ScriptInterpreterPython::SynchronicityHandler::~SynchronicityHandler() {
  if (m_synch_wanted != eScriptedCommandSynchronicityCurrentValue)
    m_debugger_sp->SetAsyncExecution(m_old_asynch);
}

bool ScriptInterpreterPython::RunScriptBasedCommand(
    const char *impl_function, const char *args,
    ScriptedCommandSynchronicity synchronicity,
    lldb_private::CommandReturnObject &cmd_retobj, Error &error,
    const lldb_private::ExecutionContext &exe_ctx) {
  if (!impl_function) {
    error.SetErrorString("no function to execute");
    return false;
  }

  if (!g_swig_call_command) {
    error.SetErrorString("no helper function to run scripted commands");
    return false;
  }

  lldb::DebuggerSP debugger_sp = m_interpreter.GetDebugger().shared_from_this();
  lldb::ExecutionContextRefSP exe_ctx_ref_sp(new ExecutionContextRef(exe_ctx));

  if (!debugger_sp.get()) {
    error.SetErrorString("invalid Debugger pointer");
    return false;
  }

  bool ret_val = false;

  std::string err_msg;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession |
                       (cmd_retobj.GetInteractive() ? 0 : Locker::NoSTDIN),
                   Locker::FreeLock | Locker::TearDownSession);

    SynchronicityHandler synch_handler(debugger_sp, synchronicity);

    ret_val =
        g_swig_call_command(impl_function, m_dictionary_name.c_str(),
                            debugger_sp, args, cmd_retobj, exe_ctx_ref_sp);
  }

  if (!ret_val)
    error.SetErrorString("unable to execute script function");
  else
    error.Clear();

  return ret_val;
}

bool ScriptInterpreterPython::RunScriptBasedCommand(
    StructuredData::GenericSP impl_obj_sp, const char *args,
    ScriptedCommandSynchronicity synchronicity,
    lldb_private::CommandReturnObject &cmd_retobj, Error &error,
    const lldb_private::ExecutionContext &exe_ctx) {
  if (!impl_obj_sp || !impl_obj_sp->IsValid()) {
    error.SetErrorString("no function to execute");
    return false;
  }

  if (!g_swig_call_command_object) {
    error.SetErrorString("no helper function to run scripted commands");
    return false;
  }

  lldb::DebuggerSP debugger_sp = m_interpreter.GetDebugger().shared_from_this();
  lldb::ExecutionContextRefSP exe_ctx_ref_sp(new ExecutionContextRef(exe_ctx));

  if (!debugger_sp.get()) {
    error.SetErrorString("invalid Debugger pointer");
    return false;
  }

  bool ret_val = false;

  std::string err_msg;

  {
    Locker py_lock(this,
                   Locker::AcquireLock | Locker::InitSession |
                       (cmd_retobj.GetInteractive() ? 0 : Locker::NoSTDIN),
                   Locker::FreeLock | Locker::TearDownSession);

    SynchronicityHandler synch_handler(debugger_sp, synchronicity);

    ret_val = g_swig_call_command_object(impl_obj_sp->GetValue(), debugger_sp,
                                         args, cmd_retobj, exe_ctx_ref_sp);
  }

  if (!ret_val)
    error.SetErrorString("unable to execute script function");
  else
    error.Clear();

  return ret_val;
}

// in Python, a special attribute __doc__ contains the docstring
// for an object (function, method, class, ...) if any is defined
// Otherwise, the attribute's value is None
bool ScriptInterpreterPython::GetDocumentationForItem(const char *item,
                                                      std::string &dest) {
  dest.clear();
  if (!item || !*item)
    return false;
  std::string command(item);
  command += ".__doc__";

  char *result_ptr = nullptr; // Python is going to point this to valid data if
                              // ExecuteOneLineWithReturn returns successfully

  if (ExecuteOneLineWithReturn(
          command.c_str(), ScriptInterpreter::eScriptReturnTypeCharStrOrNone,
          &result_ptr,
          ScriptInterpreter::ExecuteScriptOptions().SetEnableIO(false))) {
    if (result_ptr)
      dest.assign(result_ptr);
    return true;
  } else {
    StreamString str_stream;
    str_stream.Printf(
        "Function %s was not found. Containing module might be missing.", item);
    dest.assign(str_stream.GetData());
    return false;
  }
}

bool ScriptInterpreterPython::GetShortHelpForCommandObject(
    StructuredData::GenericSP cmd_obj_sp, std::string &dest) {
  bool got_string = false;
  dest.clear();

  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_short_help";

  if (!cmd_obj_sp)
    return false;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)cmd_obj_sp->GetValue());

  if (!implementor.IsAllocated())
    return false;

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return false;

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();
    return false;
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.IsAllocated() && PythonString::Check(py_return.get())) {
    PythonString py_string(PyRefType::Borrowed, py_return.get());
    llvm::StringRef return_data(py_string.GetString());
    dest.assign(return_data.data(), return_data.size());
    got_string = true;
  }
  return got_string;
}

uint32_t ScriptInterpreterPython::GetFlagsForCommandObject(
    StructuredData::GenericSP cmd_obj_sp) {
  uint32_t result = 0;

  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_flags";

  if (!cmd_obj_sp)
    return result;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)cmd_obj_sp->GetValue());

  if (!implementor.IsAllocated())
    return result;

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return result;

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();
    return result;
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.IsAllocated() && PythonInteger::Check(py_return.get())) {
    PythonInteger int_value(PyRefType::Borrowed, py_return.get());
    result = int_value.GetInteger();
  }

  return result;
}

bool ScriptInterpreterPython::GetLongHelpForCommandObject(
    StructuredData::GenericSP cmd_obj_sp, std::string &dest) {
  bool got_string = false;
  dest.clear();

  Locker py_lock(this, Locker::AcquireLock | Locker::NoSTDIN, Locker::FreeLock);

  static char callee_name[] = "get_long_help";

  if (!cmd_obj_sp)
    return false;

  PythonObject implementor(PyRefType::Borrowed,
                           (PyObject *)cmd_obj_sp->GetValue());

  if (!implementor.IsAllocated())
    return false;

  PythonObject pmeth(PyRefType::Owned,
                     PyObject_GetAttrString(implementor.get(), callee_name));

  if (PyErr_Occurred())
    PyErr_Clear();

  if (!pmeth.IsAllocated())
    return false;

  if (PyCallable_Check(pmeth.get()) == 0) {
    if (PyErr_Occurred())
      PyErr_Clear();

    return false;
  }

  if (PyErr_Occurred())
    PyErr_Clear();

  // right now we know this function exists and is callable..
  PythonObject py_return(
      PyRefType::Owned,
      PyObject_CallMethod(implementor.get(), callee_name, nullptr));

  // if it fails, print the error but otherwise go on
  if (PyErr_Occurred()) {
    PyErr_Print();
    PyErr_Clear();
  }

  if (py_return.IsAllocated() && PythonString::Check(py_return.get())) {
    PythonString str(PyRefType::Borrowed, py_return.get());
    llvm::StringRef str_data(str.GetString());
    dest.assign(str_data.data(), str_data.size());
    got_string = true;
  }

  return got_string;
}

std::unique_ptr<ScriptInterpreterLocker>
ScriptInterpreterPython::AcquireInterpreterLock() {
  std::unique_ptr<ScriptInterpreterLocker> py_lock(new Locker(
      this, Locker::AcquireLock | Locker::InitSession | Locker::NoSTDIN,
      Locker::FreeLock | Locker::TearDownSession));
  return py_lock;
}

void ScriptInterpreterPython::InitializeInterpreter(
    SWIGInitCallback swig_init_callback,
    SWIGBreakpointCallbackFunction swig_breakpoint_callback,
    SWIGWatchpointCallbackFunction swig_watchpoint_callback,
    SWIGPythonTypeScriptCallbackFunction swig_typescript_callback,
    SWIGPythonCreateSyntheticProvider swig_synthetic_script,
    SWIGPythonCreateCommandObject swig_create_cmd,
    SWIGPythonCalculateNumChildren swig_calc_children,
    SWIGPythonGetChildAtIndex swig_get_child_index,
    SWIGPythonGetIndexOfChildWithName swig_get_index_child,
    SWIGPythonCastPyObjectToSBValue swig_cast_to_sbvalue,
    SWIGPythonGetValueObjectSPFromSBValue swig_get_valobj_sp_from_sbvalue,
    SWIGPythonUpdateSynthProviderInstance swig_update_provider,
    SWIGPythonMightHaveChildrenSynthProviderInstance
        swig_mighthavechildren_provider,
    SWIGPythonGetValueSynthProviderInstance swig_getvalue_provider,
    SWIGPythonCallCommand swig_call_command,
    SWIGPythonCallCommandObject swig_call_command_object,
    SWIGPythonCallModuleInit swig_call_module_init,
    SWIGPythonCreateOSPlugin swig_create_os_plugin,
    SWIGPythonScriptKeyword_Process swig_run_script_keyword_process,
    SWIGPythonScriptKeyword_Thread swig_run_script_keyword_thread,
    SWIGPythonScriptKeyword_Target swig_run_script_keyword_target,
    SWIGPythonScriptKeyword_Frame swig_run_script_keyword_frame,
    SWIGPythonScriptKeyword_Value swig_run_script_keyword_value,
    SWIGPython_GetDynamicSetting swig_plugin_get,
    SWIGPythonCreateScriptedThreadPlan swig_thread_plan_script,
    SWIGPythonCallThreadPlan swig_call_thread_plan) {
  g_swig_init_callback = swig_init_callback;
  g_swig_breakpoint_callback = swig_breakpoint_callback;
  g_swig_watchpoint_callback = swig_watchpoint_callback;
  g_swig_typescript_callback = swig_typescript_callback;
  g_swig_synthetic_script = swig_synthetic_script;
  g_swig_create_cmd = swig_create_cmd;
  g_swig_calc_children = swig_calc_children;
  g_swig_get_child_index = swig_get_child_index;
  g_swig_get_index_child = swig_get_index_child;
  g_swig_cast_to_sbvalue = swig_cast_to_sbvalue;
  g_swig_get_valobj_sp_from_sbvalue = swig_get_valobj_sp_from_sbvalue;
  g_swig_update_provider = swig_update_provider;
  g_swig_mighthavechildren_provider = swig_mighthavechildren_provider;
  g_swig_getvalue_provider = swig_getvalue_provider;
  g_swig_call_command = swig_call_command;
  g_swig_call_command_object = swig_call_command_object;
  g_swig_call_module_init = swig_call_module_init;
  g_swig_create_os_plugin = swig_create_os_plugin;
  g_swig_run_script_keyword_process = swig_run_script_keyword_process;
  g_swig_run_script_keyword_thread = swig_run_script_keyword_thread;
  g_swig_run_script_keyword_target = swig_run_script_keyword_target;
  g_swig_run_script_keyword_frame = swig_run_script_keyword_frame;
  g_swig_run_script_keyword_value = swig_run_script_keyword_value;
  g_swig_plugin_get = swig_plugin_get;
  g_swig_thread_plan_script = swig_thread_plan_script;
  g_swig_call_thread_plan = swig_call_thread_plan;
}

void ScriptInterpreterPython::InitializePrivate() {
  if (g_initialized)
    return;

  g_initialized = true;

  Timer scoped_timer(LLVM_PRETTY_FUNCTION, LLVM_PRETTY_FUNCTION);

  // RAII-based initialization which correctly handles multiple-initialization,
  // version-
  // specific differences among Python 2 and Python 3, and saving and restoring
  // various
  // other pieces of state that can get mucked with during initialization.
  InitializePythonRAII initialize_guard;

  if (g_swig_init_callback)
    g_swig_init_callback();

  // Update the path python uses to search for modules to include the current
  // directory.

  PyRun_SimpleString("import sys");
  AddToSysPath(AddLocation::End, ".");

  FileSpec file_spec;
  // Don't denormalize paths when calling file_spec.GetPath().  On platforms
  // that use
  // a backslash as the path separator, this will result in executing python
  // code containing
  // paths with unescaped backslashes.  But Python also accepts forward slashes,
  // so to make
  // life easier we just use that.
  if (HostInfo::GetLLDBPath(ePathTypePythonDir, file_spec))
    AddToSysPath(AddLocation::Beginning, file_spec.GetPath(false));
  if (HostInfo::GetLLDBPath(ePathTypeLLDBShlibDir, file_spec))
    AddToSysPath(AddLocation::Beginning, file_spec.GetPath(false));

  PyRun_SimpleString("sys.dont_write_bytecode = 1; import "
                     "lldb.embedded_interpreter; from "
                     "lldb.embedded_interpreter import run_python_interpreter; "
                     "from lldb.embedded_interpreter import run_one_line");
}

void ScriptInterpreterPython::AddToSysPath(AddLocation location,
                                           std::string path) {
  std::string path_copy;

  std::string statement;
  if (location == AddLocation::Beginning) {
    statement.assign("sys.path.insert(0,\"");
    statement.append(path);
    statement.append("\")");
  } else {
    statement.assign("sys.path.append(\"");
    statement.append(path);
    statement.append("\")");
  }
  PyRun_SimpleString(statement.c_str());
}

// void
// ScriptInterpreterPython::Terminate ()
//{
//    // We are intentionally NOT calling Py_Finalize here (this would be the
//    logical place to call it).  Calling
//    // Py_Finalize here causes test suite runs to seg fault:  The test suite
//    runs in Python.  It registers
//    // SBDebugger::Terminate to be called 'at_exit'.  When the test suite
//    Python harness finishes up, it calls
//    // Py_Finalize, which calls all the 'at_exit' registered functions.
//    SBDebugger::Terminate calls Debugger::Terminate,
//    // which calls lldb::Terminate, which calls ScriptInterpreter::Terminate,
//    which calls
//    // ScriptInterpreterPython::Terminate.  So if we call Py_Finalize here, we
//    end up with Py_Finalize being called from
//    // within Py_Finalize, which results in a seg fault.
//    //
//    // Since this function only gets called when lldb is shutting down and
//    going away anyway, the fact that we don't
//    // actually call Py_Finalize should not cause any problems (everything
//    should shut down/go away anyway when the
//    // process exits).
//    //
////    Py_Finalize ();
//}

#endif // #ifdef LLDB_DISABLE_PYTHON