/*
 * ompdModule.c
 */

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "ompdDLService.h"

#include <Python.h>
#include <omp-tools.h>
// #include <ompd.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define OMPD_WEAK_ATTR __attribute__((weak))

struct _ompd_aspace_cont {
  int id;
};
struct _ompd_thread_cont {
  int id;
};
ompd_address_space_context_t acontext = {42};

PyObject *pModule;

ompd_rc_t _print(const char *str, int category);

// NOTE: implement functions to check parameters of OMPD API functions for
// correctness
OMPD_WEAK_ATTR ompd_rc_t ompd_get_api_version(ompd_word_t *addr) {
  static ompd_rc_t (*my_get_api_version)(ompd_word_t *) = NULL;
  if (!my_get_api_version) {
    my_get_api_version = ompd_get_symbol("ompd_get_api_version");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_api_version(addr);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_version_string(const char **string) {
  static ompd_rc_t (*my_get_version_string)(const char **) = NULL;
  if (!my_get_version_string) {
    my_get_version_string = ompd_get_symbol("ompd_get_version_string");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_version_string(string);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_finalize(void) {
  static ompd_rc_t (*my_ompd_finalize)(void) = NULL;
  if (!my_ompd_finalize) {
    my_ompd_finalize = ompd_get_symbol("ompd_finalize");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_ompd_finalize();
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_process_initialize(ompd_address_space_context_t *context,
                        ompd_address_space_handle_t **handle) {
  static ompd_rc_t (*my_ompd_process_initialize)(
      ompd_address_space_context_t *, ompd_address_space_handle_t **) = NULL;
  if (!my_ompd_process_initialize) {
    my_ompd_process_initialize = ompd_get_symbol("ompd_process_initialize");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_ompd_process_initialize(context, handle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_omp_version(
    ompd_address_space_handle_t *address_space, ompd_word_t *omp_version) {
  static ompd_rc_t (*my_ompd_get_omp_version)(ompd_address_space_handle_t *,
                                              ompd_word_t *) = NULL;
  if (!my_ompd_get_omp_version) {
    my_ompd_get_omp_version = ompd_get_symbol("ompd_get_omp_version");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_ompd_get_omp_version(address_space, omp_version);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_omp_version_string(
    ompd_address_space_handle_t *address_space, const char **string) {
  static ompd_rc_t (*my_ompd_get_omp_version_string)(
      ompd_address_space_handle_t *, const char **) = NULL;
  if (!my_ompd_get_omp_version_string) {
    my_ompd_get_omp_version_string =
        ompd_get_symbol("ompd_get_omp_version_string");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_ompd_get_omp_version_string(address_space, string);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_thread_handle(
    ompd_address_space_handle_t *handle, ompd_thread_id_t kind,
    ompd_size_t tidSize, const void *tid, ompd_thread_handle_t **threadHandle) {
  static ompd_rc_t (*my_get_thread_handle)(
      ompd_address_space_handle_t *, ompd_thread_id_t, ompd_size_t,
      const void *, ompd_thread_handle_t **) = NULL;
  if (!my_get_thread_handle) {
    my_get_thread_handle = ompd_get_symbol("ompd_get_thread_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_thread_handle(handle, kind, tidSize, tid, threadHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_thread_in_parallel(
    ompd_parallel_handle_t *parallelHandle, int threadNum,
    ompd_thread_handle_t **threadHandle) {
  static ompd_rc_t (*my_get_thread_in_parallel)(ompd_parallel_handle_t *, int,
                                                ompd_thread_handle_t **) = NULL;
  if (!my_get_thread_in_parallel) {
    my_get_thread_in_parallel = ompd_get_symbol("ompd_get_thread_in_parallel");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_thread_in_parallel(parallelHandle, threadNum, threadHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_thread_handle_compare(
    ompd_thread_handle_t *thread_handle1, ompd_thread_handle_t *thread_handle2,
    int *cmp_value) {
  static ompd_rc_t (*my_thread_handle_compare)(
      ompd_thread_handle_t *, ompd_thread_handle_t *, int *) = NULL;
  if (!my_thread_handle_compare) {
    my_thread_handle_compare = ompd_get_symbol("ompd_thread_handle_compare");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_thread_handle_compare(thread_handle1, thread_handle2, cmp_value);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_curr_parallel_handle(ompd_thread_handle_t *threadHandle,
                              ompd_parallel_handle_t **parallelHandle) {
  static ompd_rc_t (*my_get_current_parallel_handle)(
      ompd_thread_handle_t *, ompd_parallel_handle_t **) = NULL;
  if (!my_get_current_parallel_handle) {
    my_get_current_parallel_handle =
        ompd_get_symbol("ompd_get_curr_parallel_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_current_parallel_handle(threadHandle, parallelHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_parallel_handle_compare(
    ompd_parallel_handle_t *parallel_handle_1,
    ompd_parallel_handle_t *parallel_handle_2, int *cmp_value) {
  static ompd_rc_t (*my_parallel_handle_compare)(
      ompd_parallel_handle_t *, ompd_parallel_handle_t *, int *) = NULL;
  if (!my_parallel_handle_compare) {
    my_parallel_handle_compare =
        ompd_get_symbol("ompd_parallel_handle_compare");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_parallel_handle_compare(parallel_handle_1, parallel_handle_2,
                                    cmp_value);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_enclosing_parallel_handle(ompd_parallel_handle_t *parallelHandle,
                                   ompd_parallel_handle_t **enclosing) {
  static ompd_rc_t (*my_get_enclosing_parallel_handle)(
      ompd_parallel_handle_t *, ompd_parallel_handle_t **) = NULL;
  if (!my_get_enclosing_parallel_handle) {
    my_get_enclosing_parallel_handle =
        ompd_get_symbol("ompd_get_enclosing_parallel_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_enclosing_parallel_handle(parallelHandle, enclosing);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_task_parallel_handle(ompd_task_handle_t *taskHandle,
                              ompd_parallel_handle_t **taskParallelHandle) {
  static ompd_rc_t (*my_get_task_parallel_handle)(
      ompd_task_handle_t *, ompd_parallel_handle_t **) = NULL;
  if (!my_get_task_parallel_handle) {
    my_get_task_parallel_handle =
        ompd_get_symbol("ompd_get_task_parallel_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_task_parallel_handle(taskHandle, taskParallelHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_curr_task_handle(
    ompd_thread_handle_t *threadHandle, ompd_task_handle_t **taskHandle) {
  static ompd_rc_t (*my_get_current_task_handle)(ompd_thread_handle_t *,
                                                 ompd_task_handle_t **) = NULL;
  if (!my_get_current_task_handle) {
    my_get_current_task_handle = ompd_get_symbol("ompd_get_curr_task_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_current_task_handle(threadHandle, taskHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_generating_task_handle(
    ompd_task_handle_t *taskHandle, ompd_task_handle_t **generating) {
  static ompd_rc_t (*my_get_generating_task_handle)(
      ompd_task_handle_t *, ompd_task_handle_t **) = NULL;
  if (!my_get_generating_task_handle) {
    my_get_generating_task_handle =
        ompd_get_symbol("ompd_get_generating_task_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_generating_task_handle(taskHandle, generating);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_scheduling_task_handle(
    ompd_task_handle_t *taskHandle, ompd_task_handle_t **scheduling) {
  static ompd_rc_t (*my_get_scheduling_task_handle)(
      ompd_task_handle_t *, ompd_task_handle_t **) = NULL;
  if (!my_get_scheduling_task_handle) {
    my_get_scheduling_task_handle =
        ompd_get_symbol("ompd_get_scheduling_task_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_scheduling_task_handle(taskHandle, scheduling);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_task_in_parallel(ompd_parallel_handle_t *parallelHandle, int threadNum,
                          ompd_task_handle_t **taskHandle) {
  static ompd_rc_t (*my_get_task_in_parallel)(ompd_parallel_handle_t *, int,
                                              ompd_task_handle_t **) = NULL;
  if (!my_get_task_in_parallel) {
    my_get_task_in_parallel = ompd_get_symbol("ompd_get_task_in_parallel");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_task_in_parallel(parallelHandle, threadNum, taskHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_task_frame(ompd_task_handle_t *taskHandle,
                                             ompd_frame_info_t *exitFrame,
                                             ompd_frame_info_t *enterFrame) {
  static ompd_rc_t (*my_get_task_frame)(
      ompd_task_handle_t *, ompd_frame_info_t *, ompd_frame_info_t *) = NULL;
  if (!my_get_task_frame) {
    my_get_task_frame = ompd_get_symbol("ompd_get_task_frame");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_task_frame(taskHandle, exitFrame, enterFrame);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_icv_from_scope(void *handle,
                                                 ompd_scope_t scope,
                                                 ompd_icv_id_t icvId,
                                                 ompd_word_t *icvValue) {
  static ompd_rc_t (*my_get_icv_from_scope)(void *, ompd_scope_t, ompd_icv_id_t,
                                            ompd_word_t *) = NULL;
  if (!my_get_icv_from_scope) {
    my_get_icv_from_scope = ompd_get_symbol("ompd_get_icv_from_scope");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_icv_from_scope(handle, scope, icvId, icvValue);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_enumerate_icvs(ompd_address_space_handle_t *handle, ompd_icv_id_t current,
                    ompd_icv_id_t *next, const char **nextIcvName,
                    ompd_scope_t *nextScope, int *more) {
  static ompd_rc_t (*my_enumerate_icvs)(
      ompd_address_space_handle_t *, ompd_icv_id_t, ompd_icv_id_t *,
      const char **, ompd_scope_t *, int *) = NULL;
  if (!my_enumerate_icvs) {
    my_enumerate_icvs = ompd_get_symbol("ompd_enumerate_icvs");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_enumerate_icvs(handle, current, next, nextIcvName, nextScope, more);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_enumerate_states(ompd_address_space_handle_t *addrSpaceHandle,
                      ompd_word_t currentState, ompd_word_t *nextState,
                      const char **nextStateName, ompd_word_t *moreEnums) {
  static ompd_rc_t (*my_enumerate_states)(ompd_address_space_handle_t *,
                                          ompd_word_t, ompd_word_t *,
                                          const char **, ompd_word_t *) = NULL;
  if (!my_enumerate_states) {
    my_enumerate_states = ompd_get_symbol("ompd_enumerate_states");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_enumerate_states(addrSpaceHandle, currentState, nextState,
                             nextStateName, moreEnums);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_state(ompd_thread_handle_t *threadHandle,
                                        ompd_word_t *state,
                                        ompd_wait_id_t *waitId) {
  static ompd_rc_t (*my_get_state)(ompd_thread_handle_t *, ompd_word_t *,
                                   ompd_wait_id_t *) = NULL;
  if (!my_get_state) {
    my_get_state = ompd_get_symbol("ompd_get_state");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_state(threadHandle, state, waitId);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_task_function(ompd_task_handle_t *taskHandle,
                                                ompd_address_t *entryPoint) {
  static ompd_rc_t (*my_get_task_function)(ompd_task_handle_t *,
                                           ompd_address_t *) = NULL;
  if (!my_get_task_function) {
    my_get_task_function = ompd_get_symbol("ompd_get_task_function");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_task_function(taskHandle, entryPoint);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_thread_id(ompd_thread_handle_t *threadHandle,
                                            ompd_thread_id_t kind,
                                            ompd_size_t tidSize, void *tid) {
  static ompd_rc_t (*my_get_thread_id)(ompd_thread_handle_t *, ompd_thread_id_t,
                                       ompd_size_t, void *) = NULL;
  if (!my_get_thread_id) {
    my_get_thread_id = ompd_get_symbol("ompd_get_thread_id");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_thread_id(threadHandle, kind, tidSize, tid);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_get_tool_data(void *handle, ompd_scope_t scope,
                                            ompd_word_t *value,
                                            ompd_address_t *ptr) {
  static ompd_rc_t (*my_get_tool_data)(void *, ompd_scope_t, ompd_word_t *,
                                       ompd_address_t *) = NULL;
  if (!my_get_tool_data) {
    my_get_tool_data = ompd_get_symbol("ompd_get_tool_data");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_tool_data(handle, scope, value, ptr);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_icv_string_from_scope(void *handle, ompd_scope_t scope,
                               ompd_icv_id_t icvId, const char **icvString) {
  static ompd_rc_t (*my_get_icv_string_from_scope)(
      void *, ompd_scope_t, ompd_icv_id_t, const char **) = NULL;
  if (!my_get_icv_string_from_scope) {
    my_get_icv_string_from_scope =
        ompd_get_symbol("ompd_get_icv_string_from_scope");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_get_icv_string_from_scope(handle, scope, icvId, icvString);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_rel_thread_handle(ompd_thread_handle_t *threadHandle) {
  static ompd_rc_t (*my_release_thread_handle)(ompd_thread_handle_t *) = NULL;
  if (!my_release_thread_handle) {
    my_release_thread_handle = ompd_get_symbol("ompd_rel_thread_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_release_thread_handle(threadHandle);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_rel_parallel_handle(ompd_parallel_handle_t *parallelHandle) {
  static ompd_rc_t (*my_release_parallel_handle)(ompd_parallel_handle_t *) =
      NULL;
  if (!my_release_parallel_handle) {
    my_release_parallel_handle = ompd_get_symbol("ompd_rel_parallel_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_release_parallel_handle(parallelHandle);
}

OMPD_WEAK_ATTR ompd_rc_t ompd_rel_task_handle(ompd_task_handle_t *taskHandle) {
  static ompd_rc_t (*my_release_task_handle)(ompd_task_handle_t *) = NULL;
  if (!my_release_task_handle) {
    my_release_task_handle = ompd_get_symbol("ompd_rel_task_handle");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_release_task_handle(taskHandle);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_task_handle_compare(ompd_task_handle_t *task_handle_1,
                         ompd_task_handle_t *task_handle_2, int *cmp_value) {
  static ompd_rc_t (*my_task_handle_compare)(
      ompd_task_handle_t *, ompd_task_handle_t *, int *) = NULL;
  if (!my_task_handle_compare) {
    my_task_handle_compare = ompd_get_symbol("ompd_task_handle_compare");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_task_handle_compare(task_handle_1, task_handle_2, cmp_value);
}

OMPD_WEAK_ATTR ompd_rc_t
ompd_get_display_control_vars(ompd_address_space_handle_t *address_space_handle,
                              const char *const **control_vars) {
  static ompd_rc_t (*my_ompd_get_display_control_vars)(
      ompd_address_space_handle_t *, const char *const **) = NULL;
  if (!my_ompd_get_display_control_vars) {
    my_ompd_get_display_control_vars =
        ompd_get_symbol("ompd_get_display_control_vars");
    if (ompd_get_dl_error()) {
      return ompd_rc_error;
    }
  }
  return my_ompd_get_display_control_vars(address_space_handle, control_vars);
}

/**
 * Loads the OMPD library (libompd.so). Returns an integer with the version if
 * the OMPD library could be loaded successfully. Error codes: -1: argument
 * could not be converted to string -2: error when loading the library
 * else: see ompd return codes
 */
static PyObject *ompd_open(PyObject *self, PyObject *args) {
  const char *name;
  if (!PyArg_ParseTuple(args, "s", &name)) {
    return Py_BuildValue("i", -1);
  }
  if (ompd_load_library(name) != 0) {
    /* Keep -2 so ompd.py can try the next ompd_dll_locations entry.
     * The helper error stays in ompd_get_dl_error() for the caller. */
    return Py_BuildValue("i", -2);
  }
  ompd_word_t version;
  ompd_rc_t rc = ompd_get_api_version(&version);
  if (rc != ompd_rc_ok)
    return Py_BuildValue("l", -10 - rc);

  int returnValue = version;
  return Py_BuildValue("i", returnValue);
}

/**
 * Last load/lookup error from the symbol-lookup helper, or None.
 */
static PyObject *call_ompd_get_dl_error(PyObject *self, PyObject *noargs) {
  const char *err = ompd_get_dl_error();
  if (!err)
    Py_RETURN_NONE;
  return Py_BuildValue("s", err);
}

/**
 * Have the debugger print a string.
 */
ompd_rc_t _print(const char *str, int category) {
  PyObject *pFunc = PyObject_GetAttrString(pModule, "_print");
  if (pFunc && PyCallable_Check(pFunc)) {
    PyObject *pArgs = PyTuple_New(1);
    PyTuple_SetItem(pArgs, 0, Py_BuildValue("s", str));
    PyObject_CallObject(pFunc, pArgs);
    Py_XDECREF(pArgs);
  }
  Py_XDECREF(pFunc);
  return ompd_rc_ok;
}

void _printf(const char *format, ...) {
  va_list args;
  va_start(args, format);
  char output[1024];
  vsnprintf(output, 1024, format, args);
  va_end(args);
  _print(output, 0);
}

/**
 * Capsule destructors for thread, parallel and task handles.
 */
static void call_ompd_rel_thread_handle_temp(PyObject *capsule) {
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)(PyCapsule_GetPointer(capsule, "ThreadHandle"));

  ompd_rc_t retVal = ompd_rel_thread_handle(threadHandle);
  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_rel_thread_handle! Error code: %d",
        retVal);
  }
}

static void destroyThreadCapsule(PyObject *capsule) {
  call_ompd_rel_thread_handle_temp(capsule);
}
static void (*my_thread_capsule_destructor)(PyObject *) = destroyThreadCapsule;

static void call_ompd_rel_parallel_handle_temp(PyObject *capsule) {
  ompd_parallel_handle_t *parallelHandle =
      (ompd_parallel_handle_t *)(PyCapsule_GetPointer(capsule,
                                                      "ParallelHandle"));

  ompd_rc_t retVal = ompd_rel_parallel_handle(parallelHandle);
  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_rel_parallel_handle! Error "
            "code: %d",
            retVal);
  }
}

static void destroyParallelCapsule(PyObject *capsule) {
  call_ompd_rel_parallel_handle_temp(capsule);
}
static void (*my_parallel_capsule_destructor)(PyObject *) =
    destroyParallelCapsule;

static void call_ompd_rel_task_handle_temp(PyObject *capsule) {
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)(PyCapsule_GetPointer(capsule, "TaskHandle"));

  ompd_rc_t retVal = ompd_rel_task_handle(taskHandle);
  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_rel_task_handle!\n");
  }
}

static void destroyTaskCapsule(PyObject *capsule) {
  call_ompd_rel_task_handle_temp(capsule);
}
static void (*my_task_capsule_destructor)(PyObject *) = destroyTaskCapsule;

/**
 * Release thread handle. Called inside destructor for Python thread_handle
 * object.
 */
static PyObject *call_ompd_rel_thread_handle(PyObject *self, PyObject *args) {
  PyObject *threadHandlePy = PyTuple_GetItem(args, 0);
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)(PyCapsule_GetPointer(threadHandlePy,
                                                    "ThreadHandle"));

  ompd_rc_t retVal = ompd_rel_thread_handle(threadHandle);
  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_rel_thread_handle! Error code: %d",
        retVal);
  }
  return Py_BuildValue("l", retVal);
}

/**
 * Allocate memory in the debugger's address space.
 */
ompd_rc_t _alloc(ompd_size_t bytes, void **ptr) {
  if (ptr == NULL) {
    return ompd_rc_bad_input;
  }
  *ptr = malloc(bytes);
  return ompd_rc_ok;
}

/**
 * Free memory in the debugger's address space.
 */
ompd_rc_t _free(void *ptr) {
  free(ptr);
  return ompd_rc_ok;
}

/**
 * Look up the sizes of primitive types in the target.
 */
ompd_rc_t _sizes(ompd_address_space_context_t *_acontext, /* IN */
                 ompd_device_type_sizes_t *sizes)         /* OUT */
{
  if (acontext.id != _acontext->id)
    return ompd_rc_stale_handle;
  ompd_device_type_sizes_t mysizes = {
      (uint8_t)sizeof(char),      (uint8_t)sizeof(short),
      (uint8_t)sizeof(int),       (uint8_t)sizeof(long),
      (uint8_t)sizeof(long long), (uint8_t)sizeof(void *)};
  *sizes = mysizes;
  return ompd_rc_ok;
}

/**
 * Look up the address of a global symbol in the target.
 */
ompd_rc_t _sym_addr(ompd_address_space_context_t *context, /* IN */
                    ompd_thread_context_t *tcontext,       /* IN */
                    const char *symbol_name,               /* IN */
                    ompd_address_t *symbol_addr,           /* OUT */
                    const char *file_name)                 /* IN */
{
  int thread_id = -1;
  PyObject *symbolAddress;
  if (tcontext != NULL) {
    thread_id = tcontext->id;
  }
  PyObject *pFunc = PyObject_GetAttrString(pModule, "_sym_addr");
  if (pFunc && PyCallable_Check(pFunc)) {
    PyObject *pArgs = PyTuple_New(2);
    PyTuple_SetItem(pArgs, 0, Py_BuildValue("i", thread_id));
    PyTuple_SetItem(pArgs, 1, Py_BuildValue("s", symbol_name));
    symbolAddress = PyObject_CallObject(pFunc, pArgs);
    if (symbolAddress == NULL) {
      PyErr_Print();
    }
    symbol_addr->address = PyLong_AsLong(symbolAddress);
    Py_XDECREF(pArgs);
    Py_XDECREF(symbolAddress);
  }
  Py_XDECREF(pFunc);
  return ompd_rc_ok;
}

/**
 * Read memory from the target.
 */
ompd_rc_t _read(ompd_address_space_context_t *context, /* IN */
                ompd_thread_context_t *tcontext,       /* IN */
                const ompd_address_t *addr,            /* IN */
                ompd_size_t nbytes,                    /* IN */
                void *buffer)                          /* OUT */
{
  uint64_t readMem = (uint64_t)addr->address;
  PyObject *pFunc = PyObject_GetAttrString(pModule, "_read");
  if (pFunc && PyCallable_Check(pFunc)) {
    PyObject *pArgs = PyTuple_New(2);
    PyTuple_SetItem(pArgs, 0, Py_BuildValue("l", readMem));
    PyTuple_SetItem(pArgs, 1, Py_BuildValue("l", nbytes));
    PyObject *retArray = PyObject_CallObject(pFunc, pArgs);
    Py_XDECREF(pArgs);
    if (retArray == NULL) {
      PyErr_Print();
    }
    if (!PyByteArray_Check(retArray)) {
      return ompd_rc_error;
    }
    Py_ssize_t retSize = PyByteArray_Size(retArray);
    const char *strBuf = PyByteArray_AsString(retArray);
    if ((ompd_size_t)retSize != nbytes) {
      return ompd_rc_error;
    }
    memcpy(buffer, strBuf, nbytes);
    Py_XDECREF(retArray);
  }
  Py_XDECREF(pFunc);
  return ompd_rc_ok;
}

/**
 * Reads string from target.
 */
ompd_rc_t _read_string(ompd_address_space_context_t *context, /* IN */
                       ompd_thread_context_t *tcontext,       /* IN */
                       const ompd_address_t *addr,            /* IN */
                       ompd_size_t nbytes,                    /* IN */
                       void *buffer)                          /* OUT */
{
  ompd_rc_t retVal = ompd_rc_ok;
  uint64_t readMem = (uint64_t)addr->address;
  PyObject *pFunc = PyObject_GetAttrString(pModule, "_read_string");
  PyObject *pArgs = PyTuple_New(1);
  PyTuple_SetItem(pArgs, 0, Py_BuildValue("l", readMem));
  PyObject *retString = PyObject_CallObject(pFunc, pArgs);
  Py_XDECREF(pArgs);
  if (!PyUnicode_Check(retString)) {
    return ompd_rc_error;
  }
  Py_ssize_t retSize;
  const char *strbuffer = PyUnicode_AsUTF8AndSize(retString, &retSize);
  if ((ompd_size_t)retSize + 1 >= nbytes) {
    retVal = ompd_rc_incomplete;
  }
  strncpy(buffer, strbuffer, nbytes);
  ((char *)buffer)[nbytes - 1] = '\0';
  return retVal;
}

/**
 * Write memory from the target.
 */
ompd_rc_t
_endianess(ompd_address_space_context_t *address_space_context, /* IN */
           const void *input,                                   /* IN */
           ompd_size_t unit_size,                               /* IN */
           ompd_size_t count, /* IN: number of primitive type */
           void *output) {
  if (acontext.id != address_space_context->id)
    return ompd_rc_stale_handle;
  memmove(output, input, count * unit_size);
  return ompd_rc_ok;
}

/**
 * Returns thread context for thread id; helper function for _thread_context
 * callback.
 */
ompd_thread_context_t *get_thread_context(int id) {
  static ompd_thread_context_t *tc = NULL;
  static int size = 0;
  int i;
  if (id < 1)
    return NULL;
  if (tc == NULL) {
    size = 16;
    tc = malloc(size * sizeof(ompd_thread_context_t));
    for (i = 0; i < size; i++)
      tc[i].id = i + 1;
  }
  if (id - 1 >= size) {
    size += 16;
    tc = realloc(tc, size * sizeof(ompd_thread_context_t));
    for (i = 0; i < size; i++)
      tc[i].id = i + 1;
  }
  return tc + id - 1;
}

/**
 * Get thread specific context.
 */
ompd_rc_t
_thread_context(ompd_address_space_context_t *context, /* IN */
                ompd_thread_id_t kind,        /* IN, 0 for pthread, 1 for lwp */
                ompd_size_t sizeof_thread_id, /* IN */
                const void *thread_id,        /* IN */
                ompd_thread_context_t **thread_context) /* OUT */
{
  if (acontext.id != context->id)
    return ompd_rc_stale_handle;
  if (kind != 0 && kind != 1)
    return ompd_rc_unsupported;
  long int tid;
  if (sizeof(long int) >= 8 && sizeof_thread_id == 8)
    tid = *(const uint64_t *)thread_id;
  else if (sizeof(long int) >= 4 && sizeof_thread_id == 4)
    tid = *(const uint32_t *)thread_id;
  else if (sizeof(long int) >= 2 && sizeof_thread_id == 2)
    tid = *(const uint16_t *)thread_id;
  else
    return ompd_rc_bad_input;
  PyObject *pFunc = PyObject_GetAttrString(pModule, "_thread_context");
  if (pFunc && PyCallable_Check(pFunc)) {
    PyObject *pArgs = PyTuple_New(2);
    PyTuple_SetItem(pArgs, 0, Py_BuildValue("l", kind));
    PyTuple_SetItem(pArgs, 1, Py_BuildValue("l", tid));
    PyObject *res = PyObject_CallObject(pFunc, pArgs);
    int resAsInt = (int)PyLong_AsLong(res);
    if (resAsInt == -1) {
      // NOTE: could not find match for thread_id
      return ompd_rc_unavailable;
    }
    (*thread_context) = get_thread_context(resAsInt);
    Py_XDECREF(pArgs);
    Py_XDECREF(res);
    Py_XDECREF(pFunc);
    if (*thread_context == NULL) {
      return ompd_rc_bad_input;
    }
    return ompd_rc_ok;
  }
  Py_XDECREF(pFunc);
  return ompd_rc_error;
}

/**
 * Calls ompd_process_initialize; returns pointer to ompd_address_space_handle.
 */
static PyObject *call_ompd_initialize(PyObject *self, PyObject *noargs) {
  pModule = PyImport_Import(PyUnicode_FromString("ompd_callbacks"));

  static ompd_callbacks_t table = {
      _alloc, _free,        _print,     _sizes,     _sym_addr,      _read,
      NULL,   _read_string, _endianess, _endianess, _thread_context};

  ompd_rc_t (*my_ompd_init)(ompd_word_t version, ompd_callbacks_t *) =
      ompd_get_symbol("ompd_initialize");
  if (!my_ompd_init) {
    _printf("An error occurred when looking up ompd_initialize: %s",
            ompd_get_dl_error() ? ompd_get_dl_error() : "unknown");
    Py_RETURN_NONE;
  }
  ompd_rc_t returnInit = my_ompd_init(201811, &table);
  if (returnInit != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_initialize! Error code: %d",
            returnInit);
  }
  ompd_address_space_handle_t *addr_space = NULL;
  ompd_rc_t (*my_proc_init)(ompd_address_space_context_t *,
                            ompd_address_space_handle_t **) =
      ompd_get_symbol("ompd_process_initialize");
  if (!my_proc_init) {
    _printf("An error occurred when looking up ompd_process_initialize: %s",
            ompd_get_dl_error() ? ompd_get_dl_error() : "unknown");
    Py_RETURN_NONE;
  }
  ompd_rc_t retProcInit = my_proc_init(&acontext, &addr_space);
  if (retProcInit != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_process_initialize! Error "
            "code: %d",
            retProcInit);
  }
  return PyCapsule_New(addr_space, "AddressSpace", NULL);
}

/**
 * Returns a PyCapsule pointer to thread handle for thread with the given id.
 */
static PyObject *get_thread_handle(PyObject *self, PyObject *args) {
  PyObject *threadIdTup = PyTuple_GetItem(args, 0);
  uint64_t threadId = (uint64_t)PyLong_AsLong(threadIdTup);
  // NOTE: compiler does not know what thread handle looks like, so no memory
  // is allocated automatically in the debugger's memory space

  PyObject *addrSpaceTup = PyTuple_GetItem(args, 1);
  ompd_thread_handle_t *threadHandle;
  ompd_address_space_handle_t *addrSpace =
      (ompd_address_space_handle_t *)PyCapsule_GetPointer(addrSpaceTup,
                                                          "AddressSpace");

  ompd_size_t sizeof_tid = (ompd_size_t)sizeof(uint64_t);
  ompd_rc_t retVal = ompd_get_thread_handle(addrSpace, 1, sizeof_tid, &threadId,
                                            &threadHandle);

  if (retVal == ompd_rc_unavailable) {
    return Py_BuildValue("i", -1);
  } else if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_get_thread_handle! Error code: %d",
        retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(threadHandle, "ThreadHandle",
                       my_thread_capsule_destructor);
}

/**
 * Returns a PyCapsule pointer to a thread handle for a specific thread id in
 * the current parallel context.
 */
static PyObject *call_ompd_get_thread_in_parallel(PyObject *self,
                                                  PyObject *args) {
  PyObject *parallelHandlePy = PyTuple_GetItem(args, 0);
  int threadNum = (int)PyLong_AsLong(PyTuple_GetItem(args, 1));
  ompd_parallel_handle_t *parallelHandle =
      (ompd_parallel_handle_t *)(PyCapsule_GetPointer(parallelHandlePy,
                                                      "ParallelHandle"));
  ompd_thread_handle_t *threadHandle;

  ompd_rc_t retVal =
      ompd_get_thread_in_parallel(parallelHandle, threadNum, &threadHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_thread_in_parallel! Error "
            "code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(threadHandle, "ThreadHandle",
                       my_thread_capsule_destructor);
}

/**
 * Returns a PyCapsule pointer to the parallel handle of the current parallel
 * region associated with a thread.
 */
static PyObject *call_ompd_get_curr_parallel_handle(PyObject *self,
                                                    PyObject *args) {
  PyObject *threadHandlePy = PyTuple_GetItem(args, 0);
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)(PyCapsule_GetPointer(threadHandlePy,
                                                    "ThreadHandle"));
  ompd_parallel_handle_t *parallelHandle;

  ompd_rc_t retVal =
      ompd_get_curr_parallel_handle(threadHandle, &parallelHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_curr_parallel_handle! "
            "Error code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(parallelHandle, "ParallelHandle",
                       my_parallel_capsule_destructor);
}

/**
 * Returns a PyCapsule pointer to the parallel  handle for the parallel region
 * enclosing the parallel region specified by parallel_handle.
 */
static PyObject *call_ompd_get_enclosing_parallel_handle(PyObject *self,
                                                         PyObject *args) {
  PyObject *parallelHandlePy = PyTuple_GetItem(args, 0);
  ompd_parallel_handle_t *parallelHandle =
      (ompd_parallel_handle_t *)(PyCapsule_GetPointer(parallelHandlePy,
                                                      "ParallelHandle"));
  ompd_parallel_handle_t *enclosingParallelHandle;

  ompd_rc_t retVal = ompd_get_enclosing_parallel_handle(
      parallelHandle, &enclosingParallelHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling "
            "ompd_get_enclosing_parallel_handle!"
            "Error code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(enclosingParallelHandle, "ParallelHandle",
                       my_parallel_capsule_destructor);
}

/**
 * Returns a PyCapsule pointer to the parallel handle for the parallel region
 * enclosing the task specified.
 */
static PyObject *call_ompd_get_task_parallel_handle(PyObject *self,
                                                    PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      PyCapsule_GetPointer(taskHandlePy, "TaskHandle");
  ompd_parallel_handle_t *taskParallelHandle;

  ompd_rc_t retVal =
      ompd_get_task_parallel_handle(taskHandle, &taskParallelHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_task_parallel_handle! "
            "Error code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(taskParallelHandle, "ParallelHandle",
                       my_parallel_capsule_destructor);
}

/**
 * Releases a parallel handle; is called in by the destructor of a Python
 * parallel_handle object.
 */
static PyObject *call_ompd_rel_parallel_handle(PyObject *self, PyObject *args) {
  PyObject *parallelHandlePy = PyTuple_GetItem(args, 0);
  ompd_parallel_handle_t *parallelHandle =
      (ompd_parallel_handle_t *)(PyCapsule_GetPointer(parallelHandlePy,
                                                      "ParallelHandle"));

  ompd_rc_t retVal = ompd_rel_parallel_handle(parallelHandle);
  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_rel_parallel_handle! Error "
            "code: %d",
            retVal);
  }
  return Py_BuildValue("l", retVal);
}

/**
 * Returns a PyCapsule pointer to the task handle of the current task region
 * associated with a thread.
 */
static PyObject *call_ompd_get_curr_task_handle(PyObject *self,
                                                PyObject *args) {
  PyObject *threadHandlePy = PyTuple_GetItem(args, 0);
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)(PyCapsule_GetPointer(threadHandlePy,
                                                    "ThreadHandle"));
  ompd_task_handle_t *taskHandle;

  ompd_rc_t retVal = ompd_get_curr_task_handle(threadHandle, &taskHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_curr_task_handle! Error "
            "code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(taskHandle, "TaskHandle", my_task_capsule_destructor);
}

/**
 * Returns a task handle for the task that created the task specified.
 */
static PyObject *call_ompd_get_generating_task_handle(PyObject *self,
                                                      PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)(PyCapsule_GetPointer(taskHandlePy, "TaskHandle"));
  ompd_task_handle_t *generatingTaskHandle;

  ompd_rc_t retVal =
      ompd_get_generating_task_handle(taskHandle, &generatingTaskHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_generating_task_handle! "
            "Error code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(generatingTaskHandle, "TaskHandle",
                       my_task_capsule_destructor);
}

/**
 * Returns the task handle for the task that scheduled the task specified.
 */
static PyObject *call_ompd_get_scheduling_task_handle(PyObject *self,
                                                      PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)(PyCapsule_GetPointer(taskHandlePy, "TaskHandle"));
  ompd_task_handle_t *schedulingTaskHandle;

  ompd_rc_t retVal =
      ompd_get_scheduling_task_handle(taskHandle, &schedulingTaskHandle);

  if (retVal == ompd_rc_unavailable) {
    return Py_None;
  } else if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_scheduling_task_handle! "
            "Error code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(schedulingTaskHandle, "TaskHandle",
                       my_task_capsule_destructor);
}

/**
 * Returns task handles for the implicit tasks associated with a parallel
 * region.
 */
static PyObject *call_ompd_get_task_in_parallel(PyObject *self,
                                                PyObject *args) {
  PyObject *parallelHandlePy = PyTuple_GetItem(args, 0);
  int threadNum = (int)PyLong_AsLong(PyTuple_GetItem(args, 1));
  ompd_parallel_handle_t *parallelHandle =
      (ompd_parallel_handle_t *)(PyCapsule_GetPointer(parallelHandlePy,
                                                      "ParallelHandle"));
  ompd_task_handle_t *taskHandle;

  ompd_rc_t retVal =
      ompd_get_task_in_parallel(parallelHandle, threadNum, &taskHandle);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_task_in_parallel! Error "
            "code: %d",
            retVal);
    return Py_BuildValue("l", retVal);
  }
  return PyCapsule_New(taskHandle, "TaskHandle", my_task_capsule_destructor);
}

/**
 * Releases a task handle; is called by the destructor of a Python task_handle
 * object.
 */
static PyObject *call_ompd_rel_task_handle(PyObject *self, PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)(PyCapsule_GetPointer(taskHandlePy, "TaskHandle"));

  ompd_rc_t retVal = ompd_rel_task_handle(taskHandle);
  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_rel_task_handle! Error code: %d",
        retVal);
  }
  return Py_BuildValue("l", retVal);
}

/**
 * Calls ompd_get_task_frame and returns a PyCapsule for the enter frame of the
 * given task.
 */
static PyObject *call_ompd_get_task_frame(PyObject *self, PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)PyCapsule_GetPointer(taskHandlePy, "TaskHandle");
  ompd_frame_info_t exitFrameInfo;
  ompd_frame_info_t enterFrameInfo;

  ompd_rc_t retVal =
      ompd_get_task_frame(taskHandle, &exitFrameInfo, &enterFrameInfo);

  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_get_task_frame! Error code: %d",
        retVal);
    return Py_BuildValue("l", retVal);
  }

  PyObject *result = PyTuple_New(4);
  PyTuple_SetItem(
      result, 0, PyLong_FromUnsignedLong(enterFrameInfo.frame_address.address));
  PyTuple_SetItem(result, 1,
                  PyLong_FromUnsignedLong(enterFrameInfo.frame_flag));
  PyTuple_SetItem(result, 2,
                  PyLong_FromUnsignedLong(exitFrameInfo.frame_address.address));
  PyTuple_SetItem(result, 3, PyLong_FromUnsignedLong(exitFrameInfo.frame_flag));
  return result;
}

/**
 * Calls ompd_get_icv_from_scope.
 */
static PyObject *call_ompd_get_icv_from_scope(PyObject *self, PyObject *args) {
  PyObject *addrSpaceHandlePy = PyTuple_GetItem(args, 0);
  PyObject *scopePy = PyTuple_GetItem(args, 1);
  PyObject *icvIdPy = PyTuple_GetItem(args, 2);

  ompd_scope_t scope = (ompd_scope_t)PyLong_AsLong(scopePy);
  ompd_address_space_handle_t *addrSpaceHandle;
  switch (scope) {
  case ompd_scope_thread:
    addrSpaceHandle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        addrSpaceHandlePy, "ThreadHandle");
    break;
  case ompd_scope_parallel:
    addrSpaceHandle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        addrSpaceHandlePy, "ParallelHandle");
    break;
  case ompd_scope_implicit_task:
    addrSpaceHandle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        addrSpaceHandlePy, "TaskHandle");
    break;
  case ompd_scope_task:
    addrSpaceHandle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        addrSpaceHandlePy, "TaskHandle");
    break;
  default:
    addrSpaceHandle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        addrSpaceHandlePy, "AddressSpace");
    break;
  }

  ompd_icv_id_t icvId = (ompd_icv_id_t)PyLong_AsLong(icvIdPy);
  ompd_word_t icvValue;

  ompd_rc_t retVal =
      ompd_get_icv_from_scope(addrSpaceHandle, scope, icvId, &icvValue);

  if (retVal != ompd_rc_ok) {
    if (retVal != ompd_rc_incomplete) {
      _printf(
          "An error occurred when calling ompd_get_icv_from_scope(%i, %" PRIu64
          "): Error code: %d",
          scope, icvId, retVal);
    }
    return Py_None;
  }
  return PyLong_FromLong(icvValue);
}

/**
 * Calls ompd_enumerate_icvs.
 */
static PyObject *call_ompd_enumerate_icvs(PyObject *self, PyObject *args) {
  PyObject *addrSpaceHandlePy = PyTuple_GetItem(args, 0);
  PyObject *currentPy = PyTuple_GetItem(args, 1);
  ompd_icv_id_t current = (ompd_icv_id_t)(PyLong_AsLong(currentPy));
  ompd_address_space_handle_t *addrSpaceHandle =
      (ompd_address_space_handle_t *)PyCapsule_GetPointer(addrSpaceHandlePy,
                                                          "AddressSpace");

  const char *nextIcv;
  ompd_scope_t nextScope;
  int more;
  ompd_icv_id_t nextId;

  ompd_rc_t retVal = ompd_enumerate_icvs(addrSpaceHandle, current, &nextId,
                                         &nextIcv, &nextScope, &more);

  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_enumerate_icvs! Error code: %d",
        retVal);
    return Py_None;
  }
  PyObject *retTuple = PyTuple_New(4);
  PyTuple_SetItem(retTuple, 0, PyLong_FromUnsignedLong(nextId));
  PyTuple_SetItem(retTuple, 1, PyUnicode_FromString(nextIcv));
  PyTuple_SetItem(retTuple, 2, PyLong_FromUnsignedLong(nextScope));
  PyTuple_SetItem(retTuple, 3, PyLong_FromLong(more));
  return retTuple;
}

/**
 * Calls ompd_enumerate_states.
 */
static PyObject *call_ompd_enumerate_states(PyObject *self, PyObject *args) {
  PyObject *addrSpaceHandlePy = PyTuple_GetItem(args, 0);
  ompd_address_space_handle_t *addrSpaceHandle =
      (ompd_address_space_handle_t *)PyCapsule_GetPointer(addrSpaceHandlePy,
                                                          "AddressSpace");
  ompd_word_t currentState =
      (ompd_word_t)PyLong_AsLong(PyTuple_GetItem(args, 1));

  ompd_word_t nextState;
  const char *nextStateName;
  ompd_word_t moreEnums;

  ompd_rc_t retVal = ompd_enumerate_states(
      addrSpaceHandle, currentState, &nextState, &nextStateName, &moreEnums);

  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_enumerate_states! Error code: %d",
        retVal);
    return Py_None;
  }
  PyObject *retTuple = PyTuple_New(3);
  PyTuple_SetItem(retTuple, 0, PyLong_FromLong(nextState));
  PyTuple_SetItem(retTuple, 1, PyUnicode_FromString(nextStateName));
  PyTuple_SetItem(retTuple, 2, PyLong_FromLong(moreEnums));
  return retTuple;
}

/**
 * Calls ompd_get_state.
 */
static PyObject *call_ompd_get_state(PyObject *self, PyObject *args) {
  PyObject *threadHandlePy = PyTuple_GetItem(args, 0);
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)PyCapsule_GetPointer(threadHandlePy,
                                                   "ThreadHandle");
  ompd_word_t state;
  ompd_wait_id_t waitId;

  ompd_rc_t retVal = ompd_get_state(threadHandle, &state, &waitId);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_state! Error code: %d",
            retVal);
    return Py_None;
  }
  PyObject *retTuple = PyTuple_New(2);
  PyTuple_SetItem(retTuple, 0, PyLong_FromLong(state));
  PyTuple_SetItem(retTuple, 1, PyLong_FromUnsignedLong(waitId));
  return retTuple;
}

/**
 * Calls ompd_get_task_function and returns entry point of the code that
 * corresponds to the code executed by the task.
 */
static PyObject *call_ompd_get_task_function(PyObject *self, PyObject *args) {
  PyObject *taskHandlePy = PyTuple_GetItem(args, 0);
  ompd_task_handle_t *taskHandle =
      (ompd_task_handle_t *)PyCapsule_GetPointer(taskHandlePy, "TaskHandle");
  ompd_address_t entryPoint;

  ompd_rc_t retVal = ompd_get_task_function(taskHandle, &entryPoint);

  if (retVal != ompd_rc_ok) {
    _printf(
        "An error occurred when calling ompd_get_task_function! Error code: %d",
        retVal);
    return Py_None;
  }
  return PyLong_FromLong((long)entryPoint.address);
}

/**
 * Prints pointer stored inside PyCapusle.
 */
static PyObject *print_capsule(PyObject *self, PyObject *args) {
  PyObject *capsule = PyTuple_GetItem(args, 0);
  PyObject *name = PyTuple_GetItem(args, 1);
  void *pointer =
      PyCapsule_GetPointer(capsule, PyUnicode_AsUTF8AndSize(name, NULL));
  _printf("Capsule pointer: %p", pointer);
  return Py_None;
}

/**
 * Calls ompd_get_thread_id for given handle and returns the thread id as a
 * long.
 */
static PyObject *call_ompd_get_thread_id(PyObject *self, PyObject *args) {
  PyObject *threadHandlePy = PyTuple_GetItem(args, 0);
  ompd_thread_handle_t *threadHandle =
      (ompd_thread_handle_t *)(PyCapsule_GetPointer(threadHandlePy,
                                                    "ThreadHandle"));
  ompd_thread_id_t kind = 0; // OMPD_THREAD_ID_PTHREAD
  ompd_size_t sizeOfId = (ompd_size_t)sizeof(pthread_t);

  uint64_t thread;
  ompd_rc_t retVal = ompd_get_thread_id(threadHandle, kind, sizeOfId, &thread);

  if (retVal != ompd_rc_ok) {
    kind = 1; // OMPD_THREAD_ID_LWP
    retVal = ompd_get_thread_id(threadHandle, kind, sizeOfId, &thread);
    if (retVal != ompd_rc_ok) {
      _printf(
          "An error occurred when calling ompd_get_thread_id! Error code: %d",
          retVal);
      return Py_None;
    }
  }
  return PyLong_FromLong(thread);
}

/**
 * Calls ompd_get_tool_data and returns a tuple containing the value and pointer
 * of the ompt_data_t union for the selected scope.
 */
static PyObject *call_ompd_get_tool_data(PyObject *self, PyObject *args) {
  PyObject *scopePy = PyTuple_GetItem(args, 0);
  ompd_scope_t scope = (ompd_scope_t)(PyLong_AsLong(scopePy));
  PyObject *handlePy = PyTuple_GetItem(args, 1);
  void *handle = NULL;

  if (scope == 3) {
    ompd_thread_handle_t *threadHandle =
        (ompd_thread_handle_t *)(PyCapsule_GetPointer(handlePy,
                                                      "ThreadHandle"));
    handle = threadHandle;
  } else if (scope == 4) {
    ompd_parallel_handle_t *parallelHandle =
        (ompd_parallel_handle_t *)(PyCapsule_GetPointer(handlePy,
                                                        "ParallelHandle"));
    handle = parallelHandle;
  } else if (scope == 5 || scope == 6) {
    ompd_task_handle_t *taskHandle =
        (ompd_task_handle_t *)(PyCapsule_GetPointer(handlePy, "TaskHandle"));
    handle = taskHandle;
  } else {
    _printf("An error occurred when calling ompd_get_tool_data! Scope type not "
            "supported.");
    return Py_None;
  }

  ompd_word_t value;
  ompd_address_t ptr;

  ompd_rc_t retVal = ompd_get_tool_data(handle, scope, &value, &ptr);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_tool_data! Error code: %d",
            retVal);
    return Py_None;
  }

  PyObject *retTuple = PyTuple_New(2);
  PyTuple_SetItem(retTuple, 0, PyLong_FromLong(value));
  PyTuple_SetItem(retTuple, 1, PyLong_FromLong(ptr.address));
  return retTuple;
}

/** Calls ompd_get_icv_string_from_scope.
 */
static PyObject *call_ompd_get_icv_string_from_scope(PyObject *self,
                                                     PyObject *args) {
  PyObject *handlePy = PyTuple_GetItem(args, 0);
  PyObject *scopePy = PyTuple_GetItem(args, 1);
  PyObject *icvIdPy = PyTuple_GetItem(args, 2);

  ompd_scope_t scope = (ompd_scope_t)PyLong_AsLong(scopePy);
  void *handle = NULL;
  switch (scope) {
  case ompd_scope_thread:
    handle =
        (ompd_thread_handle_t *)PyCapsule_GetPointer(handlePy, "ThreadHandle");
    break;
  case ompd_scope_parallel:
    handle = (ompd_parallel_handle_t *)PyCapsule_GetPointer(handlePy,
                                                            "ParallelHandle");
    break;
  case ompd_scope_implicit_task:
    handle = (ompd_task_handle_t *)PyCapsule_GetPointer(handlePy, "TaskHandle");
    break;
  case ompd_scope_task:
    handle = (ompd_task_handle_t *)PyCapsule_GetPointer(handlePy, "TaskHandle");
    break;
  default:
    handle = (ompd_address_space_handle_t *)PyCapsule_GetPointer(
        handlePy, "AddressSpace");
    break;
  }

  ompd_icv_id_t icvId = (ompd_icv_id_t)PyLong_AsLong(icvIdPy);
  const char *icvString;

  ompd_rc_t retVal =
      ompd_get_icv_string_from_scope(handle, scope, icvId, &icvString);

  if (retVal != ompd_rc_ok) {
    _printf("An error occurred when calling ompd_get_icv_string_from_scope! "
            "Error code: %d",
            retVal);
    return Py_None;
  }
  return PyUnicode_FromString(icvString);
}

// Prototypes of API test functions.
PyObject *test_ompd_get_thread_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_curr_parallel_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_thread_in_parallel(PyObject *self, PyObject *args);
PyObject *test_ompd_thread_handle_compare(PyObject *self, PyObject *args);
PyObject *test_ompd_get_thread_id(PyObject *self, PyObject *args);
PyObject *test_ompd_rel_thread_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_enclosing_parallel_handle(PyObject *self,
                                                  PyObject *args);
PyObject *test_ompd_parallel_handle_compare(PyObject *self, PyObject *args);
PyObject *test_ompd_rel_parallel_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_initialize(PyObject *self, PyObject *noargs);
PyObject *test_ompd_get_api_version(PyObject *self, PyObject *noargs);
PyObject *test_ompd_get_version_string(PyObject *self, PyObject *noargs);
PyObject *test_ompd_finalize(PyObject *self, PyObject *noargs);
PyObject *test_ompd_process_initialize(PyObject *self, PyObject *noargs);
PyObject *test_ompd_device_initialize(PyObject *self, PyObject *noargs);
PyObject *test_ompd_rel_address_space_handle(PyObject *self, PyObject *noargs);
PyObject *test_ompd_get_omp_version(PyObject *self, PyObject *args);
PyObject *test_ompd_get_omp_version_string(PyObject *self, PyObject *args);
PyObject *test_ompd_get_curr_task_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_task_parallel_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_generating_task_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_scheduling_task_handle(PyObject *self, PyObject *args);
PyObject *test_ompd_get_task_in_parallel(PyObject *self, PyObject *args);
PyObject *test_ompd_rel_task_handle(PyObject *self, PyObject *noargs);
PyObject *test_ompd_task_handle_compare(PyObject *self, PyObject *args);
PyObject *test_ompd_get_task_function(PyObject *self, PyObject *args);
PyObject *test_ompd_get_task_frame(PyObject *self, PyObject *args);
PyObject *test_ompd_get_state(PyObject *self, PyObject *args);
PyObject *test_ompd_get_display_control_vars(PyObject *self, PyObject *args);
PyObject *test_ompd_rel_display_control_vars(PyObject *self, PyObject *noargs);
PyObject *test_ompd_enumerate_icvs(PyObject *self, PyObject *noargs);
PyObject *test_ompd_get_icv_from_scope_with_addr_handle(PyObject *self,
                                                        PyObject *noargs);
PyObject *test_ompd_get_icv_from_scope_with_thread_handle(PyObject *self,
                                                          PyObject *noargs);
PyObject *test_ompd_get_icv_from_scope_with_parallel_handle(PyObject *self,
                                                            PyObject *noargs);
PyObject *test_ompd_get_icv_from_scope_with_task_handle(PyObject *self,
                                                        PyObject *noargs);
PyObject *test_ompd_get_icv_string_from_scope(PyObject *self, PyObject *noargs);
PyObject *test_ompd_get_tool_data(PyObject *self, PyObject *noargs);
PyObject *test_ompd_enumerate_states(PyObject *self, PyObject *noargs);
/**
 * Binds Python function names to C functions.
 */
static PyMethodDef ompdModule_methods[] = {
    {"ompd_open", ompd_open, METH_VARARGS,
     "Load libompd, return OMPD version."},
    {"ompd_get_dl_error", call_ompd_get_dl_error, METH_NOARGS,
     "Return the last OMPD library load/lookup error, or None."},
    {"call_ompd_initialize", call_ompd_initialize, METH_NOARGS,
     "Initializes OMPD environment and callbacks."},
    {"call_ompd_rel_thread_handle", call_ompd_rel_thread_handle, METH_VARARGS,
     "Releases a thread handle."},
    {"get_thread_handle", get_thread_handle, METH_VARARGS,
     "Collects information on threads."},
    {"call_ompd_get_thread_in_parallel", call_ompd_get_thread_in_parallel,
     METH_VARARGS,
     "Obtains handle for a certain thread within parallel region."},
    {"call_ompd_get_curr_parallel_handle", call_ompd_get_curr_parallel_handle,
     METH_VARARGS,
     "Obtains a pointer to the parallel handle for the current parallel "
     "region."},
    {"call_ompd_get_enclosing_parallel_handle",
     call_ompd_get_enclosing_parallel_handle, METH_VARARGS,
     "Obtains a pointer to the parallel handle for the parallel region "
     "enclosing the parallel region specified."},
    {"call_ompd_get_task_parallel_handle", call_ompd_get_task_parallel_handle,
     METH_VARARGS,
     "Obtains a pointer to the parallel handle for the parallel region "
     "enclosing the task region specified."},
    {"call_ompd_rel_parallel_handle", call_ompd_rel_parallel_handle,
     METH_VARARGS, "Releases a parallel region handle."},
    {"call_ompd_get_curr_task_handle", call_ompd_get_curr_task_handle,
     METH_VARARGS,
     "Obtains a pointer to the task handle for the current task region "
     "associated with an OpenMP thread."},
    {"call_ompd_get_generating_task_handle",
     call_ompd_get_generating_task_handle, METH_VARARGS,
     "Obtains a pointer to the task handle for the task that was created when "
     "the task handle specified was encountered."},
    {"call_ompd_get_scheduling_task_handle",
     call_ompd_get_scheduling_task_handle, METH_VARARGS,
     "Obtains a pointer to the task handle for the task that scheduled the "
     "task specified."},
    {"call_ompd_get_task_in_parallel", call_ompd_get_task_in_parallel,
     METH_VARARGS,
     "Obtains the handle for implicit tasks associated with a parallel "
     "region."},
    {"call_ompd_rel_task_handle", call_ompd_rel_task_handle, METH_VARARGS,
     "Releases a task handle."},
    {"call_ompd_get_task_frame", call_ompd_get_task_frame, METH_VARARGS,
     "Returns a pointer to the enter and exit frame address and flag of the "
     "given task."},
    {"call_ompd_enumerate_icvs", call_ompd_enumerate_icvs, METH_VARARGS,
     "Saves ICVs in map."},
    {"call_ompd_get_icv_from_scope", call_ompd_get_icv_from_scope, METH_VARARGS,
     "Gets ICVs from scope."},
    {"call_ompd_enumerate_states", call_ompd_enumerate_states, METH_VARARGS,
     "Enumerates OMP states."},
    {"call_ompd_get_state", call_ompd_get_state, METH_VARARGS,
     "Returns state for given thread handle."},
    {"call_ompd_get_task_function", call_ompd_get_task_function, METH_VARARGS,
     "Returns point of code where task starts executing."},
    {"print_capsule", print_capsule, METH_VARARGS, "Print capsule content"},
    {"call_ompd_get_thread_id", call_ompd_get_thread_id, METH_VARARGS,
     "Maps an OMPD thread handle to a native thread."},
    {"call_ompd_get_tool_data", call_ompd_get_tool_data, METH_VARARGS,
     "Returns value and pointer of ompd_data_t for given scope and handle."},
    {"call_ompd_get_icv_string_from_scope", call_ompd_get_icv_string_from_scope,
     METH_VARARGS, "Gets ICV string representation from scope."},

    {"test_ompd_get_thread_handle", test_ompd_get_thread_handle, METH_VARARGS,
     "Test API ompd_get_thread_handle."},
    {"test_ompd_get_curr_parallel_handle", test_ompd_get_curr_parallel_handle,
     METH_VARARGS, "Test API test_ompd_get_curr_parallel_handle."},
    {"test_ompd_get_thread_in_parallel", test_ompd_get_thread_in_parallel,
     METH_VARARGS, "Test API ompd_get_thread_in_parallel."},
    {"test_ompd_thread_handle_compare", test_ompd_thread_handle_compare,
     METH_VARARGS, "Test API ompd_thread_handle_compare."},
    {"test_ompd_get_thread_id", test_ompd_get_thread_id, METH_VARARGS,
     "Test API ompd_get_thread_id."},
    {"test_ompd_rel_thread_handle", test_ompd_rel_thread_handle, METH_VARARGS,
     "Test API ompd_rel_thread_handle."},
    {"test_ompd_get_enclosing_parallel_handle",
     test_ompd_get_enclosing_parallel_handle, METH_VARARGS,
     "Test API ompd_get_enclosing_parallel_handle."},
    {"test_ompd_parallel_handle_compare", test_ompd_parallel_handle_compare,
     METH_VARARGS, "Test API test_ompd_parallel_handle_compare."},
    {"test_ompd_rel_parallel_handle", test_ompd_rel_parallel_handle,
     METH_VARARGS, "Test API ompd_rel_parallel_handle."},

    {"test_ompd_initialize", test_ompd_initialize, METH_VARARGS,
     "Test API ompd_initialize."},
    {"test_ompd_get_api_version", test_ompd_get_api_version, METH_VARARGS,
     "Test API ompd_get_api_version."},
    {"test_ompd_get_version_string", test_ompd_get_version_string, METH_VARARGS,
     "Test API ompd_get_version_string."},
    {"test_ompd_finalize", test_ompd_finalize, METH_VARARGS,
     "Test API ompd_finalize."},
    {"test_ompd_process_initialize", test_ompd_process_initialize, METH_VARARGS,
     "Test API ompd_process_initialize. "},
    {"test_ompd_device_initialize", test_ompd_device_initialize, METH_VARARGS,
     "Test API ompd_device_initialize."},
    {"test_ompd_rel_address_space_handle", test_ompd_rel_address_space_handle,
     METH_VARARGS, "Test API ompd_rel_address_space_handle."},
    {"test_ompd_get_omp_version", test_ompd_get_omp_version, METH_VARARGS,
     "Test API ompd_get_omp_version."},
    {"test_ompd_get_omp_version_string", test_ompd_get_omp_version_string,
     METH_VARARGS, "Test API ompd_get_omp_version_string."},

    {"test_ompd_get_curr_task_handle", test_ompd_get_curr_task_handle,
     METH_VARARGS, "Test API ompd_get_curr_task_handle."},
    {"test_ompd_get_task_parallel_handle", test_ompd_get_task_parallel_handle,
     METH_VARARGS, "Test API ompd_get_task_parallel_handle."},
    {"test_ompd_get_generating_task_handle",
     test_ompd_get_generating_task_handle, METH_VARARGS,
     "Test API ompd_get_generating_task_handle."},
    {"test_ompd_get_scheduling_task_handle",
     test_ompd_get_scheduling_task_handle, METH_VARARGS,
     "Test API ompd_get_scheduling_task_handle."},
    {"test_ompd_get_task_in_parallel", test_ompd_get_task_in_parallel,
     METH_VARARGS, "Test API ompd_get_task_in_parallel."},
    {"test_ompd_rel_task_handle", test_ompd_rel_task_handle, METH_VARARGS,
     "Test API ompd_rel_task_handle."},
    {"test_ompd_task_handle_compare", test_ompd_task_handle_compare,
     METH_VARARGS, "Test API ompd_task_handle_compare."},
    {"test_ompd_get_task_function", test_ompd_get_task_function, METH_VARARGS,
     "Test API ompd_get_task_function."},
    {"test_ompd_get_task_frame", test_ompd_get_task_frame, METH_VARARGS,
     "Test API ompd_get_task_frame."},
    {"test_ompd_get_state", test_ompd_get_state, METH_VARARGS,
     "Test API ompd_get_state."},
    {"test_ompd_get_display_control_vars", test_ompd_get_display_control_vars,
     METH_VARARGS, "Test API ompd_get_display_control_vars."},
    {"test_ompd_rel_display_control_vars", test_ompd_rel_display_control_vars,
     METH_VARARGS, "Test API ompd_rel_display_control_vars."},
    {"test_ompd_enumerate_icvs", test_ompd_enumerate_icvs, METH_VARARGS,
     "Test API ompd_enumerate_icvs."},
    {"test_ompd_get_icv_from_scope_with_addr_handle",
     test_ompd_get_icv_from_scope_with_addr_handle, METH_VARARGS,
     "Test API ompd_get_icv_from_scope with addr_handle."},
    {"test_ompd_get_icv_from_scope_with_thread_handle",
     test_ompd_get_icv_from_scope_with_thread_handle, METH_VARARGS,
     "Test API ompd_get_icv_from_scope with thread_handle."},
    {"test_ompd_get_icv_from_scope_with_parallel_handle",
     test_ompd_get_icv_from_scope_with_parallel_handle, METH_VARARGS,
     "Test API ompd_get_icv_from_scope with parallel_handle."},
    {"test_ompd_get_icv_from_scope_with_task_handle",
     test_ompd_get_icv_from_scope_with_task_handle, METH_VARARGS,
     "Test API ompd_get_icv_from_scope with task_handle."},
    {"test_ompd_get_icv_string_from_scope", test_ompd_get_icv_string_from_scope,
     METH_VARARGS, "Test API ompd_get_icv_string_from_scope."},
    {"test_ompd_get_tool_data", test_ompd_get_tool_data, METH_VARARGS,
     "Test API ompd_get_tool_data."},
    {"test_ompd_enumerate_states", test_ompd_enumerate_states, METH_VARARGS,
     "Test API ompd_enumerate_states."},
    {NULL, NULL, 0, NULL}};

/**
 * Lets Python initialize module.
 */
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef moduledef = {
    PyModuleDef_HEAD_INIT,
    "ompdModule",       /* m_name */
    "This is a module", /* m_doc */
    -1,                 /* m_size */
    ompdModule_methods, /* m_methods */
    NULL,               /* m_reload */
    NULL,               /* m_traverse */
    NULL,               /* m_clear */
    NULL,               /* m_free */
};
#endif
void PyInit_ompdModule(void) {
  //	(void) Py_InitModule("ompdModule", ompdModule_methods);
  PyModule_Create(&moduledef);
}