text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013, 2014 Damien P. George
   * Copyright (c) 2014-2017 Paul Sokolovsky
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "py/builtin.h"
  #include "py/objlist.h"
  #include "py/objtuple.h"
  #include "py/objstr.h"
  #include "py/objint.h"
  #include "py/objtype.h"
  #include "py/stream.h"
  #include "py/smallint.h"
  #include "py/runtime.h"
  #include "py/persistentcode.h"
  
  #if MICROPY_PY_SYS_SETTRACE
  #include "py/objmodule.h"
  #include "py/profile.h"
  #endif
  
  #if MICROPY_PY_SYS
  
  // defined per port; type of these is irrelevant, just need pointer
  extern struct _mp_dummy_t mp_sys_stdin_obj;
  extern struct _mp_dummy_t mp_sys_stdout_obj;
  extern struct _mp_dummy_t mp_sys_stderr_obj;
  
  #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
  const mp_print_t mp_sys_stdout_print = {&mp_sys_stdout_obj, mp_stream_write_adaptor};
  #endif
  
  // version - Python language version that this implementation conforms to, as a string
  STATIC const MP_DEFINE_STR_OBJ(mp_sys_version_obj, "3.4.0");
  
  // version_info - Python language version that this implementation conforms to, as a tuple of ints
  #define I(n) MP_OBJ_NEW_SMALL_INT(n)
  // TODO: CPython is now at 5-element array, but save 2 els so far...
  STATIC const mp_obj_tuple_t mp_sys_version_info_obj = {{&mp_type_tuple}, 3, {I(3), I(4), I(0)}};
  
  // sys.implementation object
  // this holds the MicroPython version
  STATIC const mp_obj_tuple_t mp_sys_implementation_version_info_obj = {
      {&mp_type_tuple},
      3,
      { I(MICROPY_VERSION_MAJOR), I(MICROPY_VERSION_MINOR), I(MICROPY_VERSION_MICRO) }
  };
  #if MICROPY_PERSISTENT_CODE_LOAD
  #define SYS_IMPLEMENTATION_ELEMS \
      MP_ROM_QSTR(MP_QSTR_micropython), \
      MP_ROM_PTR(&mp_sys_implementation_version_info_obj), \
      MP_ROM_INT(MPY_FILE_HEADER_INT)
  #else
  #define SYS_IMPLEMENTATION_ELEMS \
      MP_ROM_QSTR(MP_QSTR_micropython), \
      MP_ROM_PTR(&mp_sys_implementation_version_info_obj)
  #endif
  #if MICROPY_PY_ATTRTUPLE
  STATIC const qstr impl_fields[] = {
      MP_QSTR_name,
      MP_QSTR_version,
      #if MICROPY_PERSISTENT_CODE_LOAD
      MP_QSTR_mpy,
      #endif
  };
  STATIC MP_DEFINE_ATTRTUPLE(
      mp_sys_implementation_obj,
      impl_fields,
      2 + MICROPY_PERSISTENT_CODE_LOAD,
      SYS_IMPLEMENTATION_ELEMS
      );
  #else
  STATIC const mp_rom_obj_tuple_t mp_sys_implementation_obj = {
      {&mp_type_tuple},
      2 + MICROPY_PERSISTENT_CODE_LOAD,
      {
          SYS_IMPLEMENTATION_ELEMS
      }
  };
  #endif
  
  #undef I
  
  #ifdef MICROPY_PY_SYS_PLATFORM
  // platform - the platform that MicroPython is running on
  STATIC const MP_DEFINE_STR_OBJ(mp_sys_platform_obj, MICROPY_PY_SYS_PLATFORM);
  #endif
  
  // exit([retval]): raise SystemExit, with optional argument given to the exception
  STATIC mp_obj_t mp_sys_exit(size_t n_args, const mp_obj_t *args) {
      mp_obj_t exc;
      if (n_args == 0) {
          exc = mp_obj_new_exception(&mp_type_SystemExit);
      } else {
          exc = mp_obj_new_exception_arg1(&mp_type_SystemExit, args[0]);
      }
      nlr_raise(exc);
  }
  MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_sys_exit_obj, 0, 1, mp_sys_exit);
  
  STATIC mp_obj_t mp_sys_print_exception(size_t n_args, const mp_obj_t *args) {
      #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
      void *stream_obj = &mp_sys_stdout_obj;
      if (n_args > 1) {
          mp_get_stream_raise(args[1], MP_STREAM_OP_WRITE);
          stream_obj = MP_OBJ_TO_PTR(args[1]);
      }
  
      mp_print_t print = {stream_obj, mp_stream_write_adaptor};
      mp_obj_print_exception(&print, args[0]);
      #else
      (void)n_args;
      mp_obj_print_exception(&mp_plat_print, args[0]);
      #endif
  
      return mp_const_none;
  }
  MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_sys_print_exception_obj, 1, 2, mp_sys_print_exception);
  
  #if MICROPY_PY_SYS_EXC_INFO
  STATIC mp_obj_t mp_sys_exc_info(void) {
      mp_obj_t cur_exc = MP_OBJ_FROM_PTR(MP_STATE_VM(cur_exception));
      mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(3, NULL));
  
      if (cur_exc == MP_OBJ_NULL) {
          t->items[0] = mp_const_none;
          t->items[1] = mp_const_none;
          t->items[2] = mp_const_none;
          return MP_OBJ_FROM_PTR(t);
      }
  
      t->items[0] = MP_OBJ_FROM_PTR(mp_obj_get_type(cur_exc));
      t->items[1] = cur_exc;
      t->items[2] = mp_const_none;
      return MP_OBJ_FROM_PTR(t);
  }
  MP_DEFINE_CONST_FUN_OBJ_0(mp_sys_exc_info_obj, mp_sys_exc_info);
  #endif
  
  #if MICROPY_PY_SYS_GETSIZEOF
  STATIC mp_obj_t mp_sys_getsizeof(mp_obj_t obj) {
      return mp_unary_op(MP_UNARY_OP_SIZEOF, obj);
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_getsizeof_obj, mp_sys_getsizeof);
  #endif
  
  #if MICROPY_PY_SYS_ATEXIT
  // atexit(callback): Callback is called when sys.exit is called.
  STATIC mp_obj_t mp_sys_atexit(mp_obj_t obj) {
      mp_obj_t old = MP_STATE_VM(sys_exitfunc);
      MP_STATE_VM(sys_exitfunc) = obj;
      return old;
  }
  STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_atexit_obj, mp_sys_atexit);
  #endif
  
  #if MICROPY_PY_SYS_SETTRACE
  // settrace(tracefunc): Set the system’s trace function.
  STATIC mp_obj_t mp_sys_settrace(mp_obj_t obj) {
      return mp_prof_settrace(obj);
  }
  MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_settrace_obj, mp_sys_settrace);
  #endif // MICROPY_PY_SYS_SETTRACE
  
  STATIC const mp_rom_map_elem_t mp_module_sys_globals_table[] = {
      { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_sys) },
  
      { MP_ROM_QSTR(MP_QSTR_path), MP_ROM_PTR(&MP_STATE_VM(mp_sys_path_obj)) },
      { MP_ROM_QSTR(MP_QSTR_argv), MP_ROM_PTR(&MP_STATE_VM(mp_sys_argv_obj)) },
      { MP_ROM_QSTR(MP_QSTR_version), MP_ROM_PTR(&mp_sys_version_obj) },
      { MP_ROM_QSTR(MP_QSTR_version_info), MP_ROM_PTR(&mp_sys_version_info_obj) },
      { MP_ROM_QSTR(MP_QSTR_implementation), MP_ROM_PTR(&mp_sys_implementation_obj) },
      #ifdef MICROPY_PY_SYS_PLATFORM
      { MP_ROM_QSTR(MP_QSTR_platform), MP_ROM_PTR(&mp_sys_platform_obj) },
      #endif
      #if MP_ENDIANNESS_LITTLE
      { MP_ROM_QSTR(MP_QSTR_byteorder), MP_ROM_QSTR(MP_QSTR_little) },
      #else
      { MP_ROM_QSTR(MP_QSTR_byteorder), MP_ROM_QSTR(MP_QSTR_big) },
      #endif
  
      #if MICROPY_PY_SYS_MAXSIZE
      #if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
      // Maximum mp_int_t value is not representable as small int, so we have
      // little choice but to use MP_SMALL_INT_MAX. Apps also should be careful
      // to not try to compare sys.maxsize to some literal number (as this
      // number might not fit in available int size), but instead count number
      // of "one" bits in sys.maxsize.
      { MP_ROM_QSTR(MP_QSTR_maxsize), MP_ROM_INT(MP_SMALL_INT_MAX) },
      #else
      { MP_ROM_QSTR(MP_QSTR_maxsize), MP_ROM_PTR(&mp_sys_maxsize_obj) },
      #endif
      #endif
  
      #if MICROPY_PY_SYS_EXIT
      { MP_ROM_QSTR(MP_QSTR_exit), MP_ROM_PTR(&mp_sys_exit_obj) },
      #endif
  
      #if MICROPY_PY_SYS_SETTRACE
      { MP_ROM_QSTR(MP_QSTR_settrace), MP_ROM_PTR(&mp_sys_settrace_obj) },
      #endif
  
      #if MICROPY_PY_SYS_STDFILES
      { MP_ROM_QSTR(MP_QSTR_stdin), MP_ROM_PTR(&mp_sys_stdin_obj) },
      { MP_ROM_QSTR(MP_QSTR_stdout), MP_ROM_PTR(&mp_sys_stdout_obj) },
      { MP_ROM_QSTR(MP_QSTR_stderr), MP_ROM_PTR(&mp_sys_stderr_obj) },
      #endif
  
      #if MICROPY_PY_SYS_MODULES
      { MP_ROM_QSTR(MP_QSTR_modules), MP_ROM_PTR(&MP_STATE_VM(mp_loaded_modules_dict)) },
      #endif
      #if MICROPY_PY_SYS_EXC_INFO
      { MP_ROM_QSTR(MP_QSTR_exc_info), MP_ROM_PTR(&mp_sys_exc_info_obj) },
      #endif
      #if MICROPY_PY_SYS_GETSIZEOF
      { MP_ROM_QSTR(MP_QSTR_getsizeof), MP_ROM_PTR(&mp_sys_getsizeof_obj) },
      #endif
  
      /*
       * Extensions to CPython
       */
  
      { MP_ROM_QSTR(MP_QSTR_print_exception), MP_ROM_PTR(&mp_sys_print_exception_obj) },
      #if MICROPY_PY_SYS_ATEXIT
      { MP_ROM_QSTR(MP_QSTR_atexit), MP_ROM_PTR(&mp_sys_atexit_obj) },
      #endif
  };
  
  STATIC MP_DEFINE_CONST_DICT(mp_module_sys_globals, mp_module_sys_globals_table);
  
  const mp_obj_module_t mp_module_sys = {
      .base = { &mp_type_module },
      .globals = (mp_obj_dict_t *)&mp_module_sys_globals,
  };
  
  #endif
  