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#ifndef Py_INTERNAL_LONG_H
#define Py_INTERNAL_LONG_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

#include "pycore_interp.h"        // PyInterpreterState.small_ints
#include "pycore_pystate.h"       // _PyThreadState_GET()

/*
 * Default int base conversion size limitation: Denial of Service prevention.
 *
 * Chosen such that this isn't wildly slow on modern hardware and so that
 * everyone's existing deployed numpy test suite passes before
 * https://github.com/numpy/numpy/issues/22098 is widely available.
 *
 * $ python -m timeit -s 's = "1"*4300' 'int(s)'
 * 2000 loops, best of 5: 125 usec per loop
 * $ python -m timeit -s 's = "1"*4300; v = int(s)' 'str(v)'
 * 1000 loops, best of 5: 311 usec per loop
 * (zen2 cloud VM)
 *
 * 4300 decimal digits fits a ~14284 bit number.
 */
#define _PY_LONG_DEFAULT_MAX_STR_DIGITS 4300
/*
 * Threshold for max digits check.  For performance reasons int() and
 * int.__str__() don't checks values that are smaller than this
 * threshold.  Acts as a guaranteed minimum size limit for bignums that
 * applications can expect from CPython.
 *
 * % python -m timeit -s 's = "1"*640; v = int(s)' 'str(int(s))'
 * 20000 loops, best of 5: 12 usec per loop
 *
 * "640 digits should be enough for anyone." - gps
 * fits a ~2126 bit decimal number.
 */
#define _PY_LONG_MAX_STR_DIGITS_THRESHOLD 640

#if ((_PY_LONG_DEFAULT_MAX_STR_DIGITS != 0) && \
   (_PY_LONG_DEFAULT_MAX_STR_DIGITS < _PY_LONG_MAX_STR_DIGITS_THRESHOLD))
# error "_PY_LONG_DEFAULT_MAX_STR_DIGITS smaller than threshold."
#endif

// Don't call this function but _PyLong_GetZero() and _PyLong_GetOne()
static inline PyObject* __PyLong_GetSmallInt_internal(int value)
{
    PyInterpreterState *interp = _PyInterpreterState_GET();
    assert(-_PY_NSMALLNEGINTS <= value && value < _PY_NSMALLPOSINTS);
    size_t index = _PY_NSMALLNEGINTS + value;
    PyObject *obj = (PyObject*)interp->small_ints[index];
    // _PyLong_GetZero(), _PyLong_GetOne() and get_small_int() must not be
    // called before _PyLong_Init() nor after _PyLong_Fini().
    assert(obj != NULL);
    return obj;
}

// Return a borrowed reference to the zero singleton.
// The function cannot return NULL.
static inline PyObject* _PyLong_GetZero(void)
{ return __PyLong_GetSmallInt_internal(0); }

// Return a borrowed reference to the one singleton.
// The function cannot return NULL.
static inline PyObject* _PyLong_GetOne(void)
{ return __PyLong_GetSmallInt_internal(1); }

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_LONG_H */

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Name Type Size Permission Actions
pycore_abstract.h File 479 B 0644
pycore_accu.h File 1.1 KB 0644
pycore_asdl.h File 2.9 KB 0644
pycore_ast.h File 28.15 KB 0644
pycore_ast_state.h File 6.31 KB 0644
pycore_atomic.h File 16.58 KB 0644
pycore_atomic_funcs.h File 2.38 KB 0644
pycore_bitutils.h File 5.15 KB 0644
pycore_blocks_output_buffer.h File 8.48 KB 0644
pycore_bytes_methods.h File 3.3 KB 0644
pycore_call.h File 870 B 0644
pycore_ceval.h File 3.4 KB 0644
pycore_code.h File 696 B 0644
pycore_compile.h File 1.02 KB 0644
pycore_condvar.h File 2.74 KB 0644
pycore_context.h File 822 B 0644
pycore_dtoa.h File 646 B 0644
pycore_fileutils.h File 1.66 KB 0644
pycore_format.h File 480 B 0644
pycore_gc.h File 6.7 KB 0644
pycore_getopt.h File 490 B 0644
pycore_gil.h File 1.53 KB 0644
pycore_hamt.h File 3.61 KB 0644
pycore_hashtable.h File 4.1 KB 0644
pycore_import.h File 346 B 0644
pycore_initconfig.h File 5.49 KB 0644
pycore_interp.h File 9.07 KB 0644
pycore_list.h File 350 B 0644
pycore_long.h File 2.53 KB 0644
pycore_moduleobject.h File 1.02 KB 0644
pycore_object.h File 5.85 KB 0644
pycore_parser.h File 626 B 0644
pycore_pathconfig.h File 1.93 KB 0644
pycore_pyarena.h File 2.67 KB 0644
pycore_pyerrors.h File 2.26 KB 0644
pycore_pyhash.h File 206 B 0644
pycore_pylifecycle.h File 4.82 KB 0644
pycore_pymem.h File 3.14 KB 0644
pycore_pystate.h File 3.85 KB 0644
pycore_runtime.h File 4.79 KB 0644
pycore_structseq.h File 386 B 0644
pycore_symtable.h File 5.45 KB 0644
pycore_sysmodule.h File 548 B 0644
pycore_traceback.h File 2.9 KB 0644
pycore_tuple.h File 425 B 0644
pycore_ucnhash.h File 898 B 0644
pycore_unionobject.h File 629 B 0644
pycore_warnings.h File 633 B 0644