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py: Implement sys.maxsize, standard way to check platform "bitness".

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Implementing it as a static constant is a bit peculiar and require cooperation
from long int implementation.
This commit is contained in:
Paul Sokolovsky
2014-07-03 16:50:11 +03:00
parent 381618269a
commit 4e0eeebdc2
6 changed files with 53 additions and 0 deletions
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19
py/modsys.c
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@@ -24,6 +24,8 @@
* THE SOFTWARE.
*/
#include <stdint.h>
#include <limits.h>
#include "mpconfig.h"
#include "misc.h"
#include "qstr.h"
@@ -33,6 +35,8 @@
#include "objlist.h"
#include "objtuple.h"
#include "objstr.h"
#include "mpz.h"
#include "objint.h"
#if MICROPY_PY_SYS
@@ -44,6 +48,8 @@ extern struct _dummy_t mp_sys_stdin_obj;
extern struct _dummy_t mp_sys_stdout_obj;
extern struct _dummy_t mp_sys_stderr_obj;
extern mp_obj_int_t mp_maxsize_obj;
mp_obj_list_t mp_sys_path_obj;
mp_obj_list_t mp_sys_argv_obj;
#define I(n) MP_OBJ_NEW_SMALL_INT(n)
@@ -70,6 +76,19 @@ STATIC const mp_map_elem_t mp_module_sys_globals_table[] = {
#else
{ MP_OBJ_NEW_QSTR(MP_QSTR_byteorder), MP_OBJ_NEW_QSTR(MP_QSTR_big) },
#endif
#if MICROPY_PY_SYS_MAXSIZE
#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
// INT_MAX is not representable as small int, as we know that small int
// takes one bit for tag. So, we have little choice but to provide this
// value. Apps also should be careful to not try to compare sys.maxsize
// with some number (which may not fit in available int size), but instead
// count number of significant bits in sys.maxsize.
{ MP_OBJ_NEW_QSTR(MP_QSTR_maxsize), MP_OBJ_NEW_SMALL_INT(INT_MAX >> 1) },
#else
{ MP_OBJ_NEW_QSTR(MP_QSTR_maxsize), (mp_obj_t)&mp_maxsize_obj },
#endif
#endif
#if MICROPY_PY_SYS_EXIT
{ MP_OBJ_NEW_QSTR(MP_QSTR_exit), (mp_obj_t)&mp_sys_exit_obj },