typeobject.cpp

#include "Python.h"
#include <cstdio>
#include <cstddef>

using namespace std;


int main(int c, char** v)
{
  printf(
   "PyObject size: %ld\n"
   "PyTypeObject size: %ld\n"
   "type.tp_basicsize: %ld\n"
   "type.tp_as_number: %ld\n"
   "type.tp_as_buffer: %ld\n"
   "type.tp_finalize: %ld\n"
   "py_hash_t: %ld\n"
   "Py_TPFLAGS_DEFAULT: %ld\n"
   ,
   sizeof(PyObject),
   sizeof(PyTypeObject),
   offsetof(PyTypeObject, tp_basicsize),
   offsetof(PyTypeObject, tp_as_number),
   offsetof(PyTypeObject, tp_as_buffer),
   offsetof(PyTypeObject, tp_finalize),
   sizeof(Py_hash_t),
   Py_TPFLAGS_DEFAULT
    );


  printf(
    "PyObject details\n"
    "object size: %ld\n"
    "ob_refcnt offset: %ld\n"
    "ob_type   offset: %ld\n"
    "gilstate size: %ld\n",
    sizeof(PyObject),
    offsetof(PyObject, ob_refcnt),
    offsetof(PyObject, ob_type),
    sizeof(PyGILState_STATE));


    printf(
    "PyMethodDef details\n"
    "object size: %ld\n"
    "ml_flags offset: %ld\n"
    "ml_doc   offset: %ld\n",
    sizeof(PyMethodDef),
    offsetof(PyMethodDef, ml_flags),
    offsetof(PyMethodDef, ml_doc));

}