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#!/usr/bin/env python3
import os
import argparse

import genapi
from genapi import \
        TypeApi, GlobalVarApi, FunctionApi, BoolValuesApi

import numpy_api

# use annotated api when running under cpychecker
h_template = r"""
#if defined(_MULTIARRAYMODULE) || defined(WITH_CPYCHECKER_STEALS_REFERENCE_TO_ARG_ATTRIBUTE)

typedef struct {
        PyObject_HEAD
        npy_bool obval;
} PyBoolScalarObject;

extern NPY_NO_EXPORT PyTypeObject PyArrayMapIter_Type;
extern NPY_NO_EXPORT PyTypeObject PyArrayNeighborhoodIter_Type;
extern NPY_NO_EXPORT PyBoolScalarObject _PyArrayScalar_BoolValues[2];

#else

#if defined(PY_ARRAY_UNIQUE_SYMBOL)
#define PyArray_API PY_ARRAY_UNIQUE_SYMBOL
#endif

#if defined(NO_IMPORT) || defined(NO_IMPORT_ARRAY)
extern void **PyArray_API;
#else
#if defined(PY_ARRAY_UNIQUE_SYMBOL)
void **PyArray_API;
#else
static void **PyArray_API=NULL;
#endif
#endif

#if !defined(NO_IMPORT_ARRAY) && !defined(NO_IMPORT)
static int
_import_array(void)
{
  int st;
  PyObject *numpy = PyImport_ImportModule("numpy.core._multiarray_umath");
  PyObject *c_api = NULL;

if (numpy == NULL) {
      return -1;
  }
  c_api = PyObject_GetAttrString(numpy, "_ARRAY_API");
  Py_DECREF(numpy);
  if (c_api == NULL) {
      PyErr_SetString(PyExc_AttributeError, "_ARRAY_API not found");
      return -1;
  }

if (!PyCapsule_CheckExact(c_api)) {
      PyErr_SetString(PyExc_RuntimeError, "_ARRAY_API is not PyCapsule object");
      Py_DECREF(c_api);
      return -1;
  }
  PyArray_API = (void **)PyCapsule_GetPointer(c_api, NULL);
  Py_DECREF(c_api);
  if (PyArray_API == NULL) {
      PyErr_SetString(PyExc_RuntimeError, "_ARRAY_API is NULL pointer");
      return -1;
  }

/* Perform runtime check of C API version */
  if (NPY_VERSION != PyArray_GetNDArrayCVersion()) {
      PyErr_Format(PyExc_RuntimeError, "module compiled against "\
             "ABI version 0x%%x but this version of numpy is 0x%%x", \
             (int) NPY_VERSION, (int) PyArray_GetNDArrayCVersion());
      return -1;
  }
  if (NPY_FEATURE_VERSION > PyArray_GetNDArrayCFeatureVersion()) {
      PyErr_Format(PyExc_RuntimeError, "module compiled against "\
             "API version 0x%%x but this version of numpy is 0x%%x . "\
             "Check the section C-API incompatibility at the "\
             "Troubleshooting ImportError section at "\
             "https://numpy.org/devdocs/user/troubleshooting-importerror.html"\
             "#c-api-incompatibility "\
              "for indications on how to solve this problem .", \
             (int) NPY_FEATURE_VERSION, (int) PyArray_GetNDArrayCFeatureVersion());
      return -1;
  }

/*
   * Perform runtime check of endianness and check it matches the one set by
   * the headers (npy_endian.h) as a safeguard
   */
  st = PyArray_GetEndianness();
  if (st == NPY_CPU_UNKNOWN_ENDIAN) {
      PyErr_SetString(PyExc_RuntimeError,
                      "FATAL: module compiled as unknown endian");
      return -1;
  }
#if NPY_BYTE_ORDER == NPY_BIG_ENDIAN
  if (st != NPY_CPU_BIG) {
      PyErr_SetString(PyExc_RuntimeError,
                      "FATAL: module compiled as big endian, but "
                      "detected different endianness at runtime");
      return -1;
  }
#elif NPY_BYTE_ORDER == NPY_LITTLE_ENDIAN
  if (st != NPY_CPU_LITTLE) {
      PyErr_SetString(PyExc_RuntimeError,
                      "FATAL: module compiled as little endian, but "
                      "detected different endianness at runtime");
      return -1;
  }
#endif

return 0;
}

#define import_array() {if (_import_array() < 0) {PyErr_Print(); PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import"); return NULL; } }

#define import_array1(ret) {if (_import_array() < 0) {PyErr_Print(); PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import"); return ret; } }

#define import_array2(msg, ret) {if (_import_array() < 0) {PyErr_Print(); PyErr_SetString(PyExc_ImportError, msg); return ret; } }

#endif

#endif
"""

c_template = r"""
/* These pointers will be stored in the C-object for use in other
    extension modules
*/

void *PyArray_API[] = {
%s
};
"""

def generate_api(output_dir, force=False):
    basename = 'multiarray_api'

h_file = os.path.join(output_dir, '__%s.h' % basename)
    c_file = os.path.join(output_dir, '__%s.c' % basename)
    targets = (h_file, c_file)

sources = numpy_api.multiarray_api

if (not force and not genapi.should_rebuild(targets, [numpy_api.__file__, __file__])):
        return targets
    else:
        do_generate_api(targets, sources)

return targets

def do_generate_api(targets, sources):
    header_file = targets[0]
    c_file = targets[1]

global_vars = sources[0]
    scalar_bool_values = sources[1]
    types_api = sources[2]
    multiarray_funcs = sources[3]

multiarray_api = sources[:]

module_list = []
    extension_list = []
    init_list = []

# Check multiarray api indexes
    multiarray_api_index = genapi.merge_api_dicts(multiarray_api)
    genapi.check_api_dict(multiarray_api_index)

numpyapi_list = genapi.get_api_functions('NUMPY_API',
                                             multiarray_funcs)

# Create dict name -> *Api instance
    api_name = 'PyArray_API'
    multiarray_api_dict = {}
    for f in numpyapi_list:
        name = f.name
        index = multiarray_funcs[name][0]
        annotations = multiarray_funcs[name][1:]
        multiarray_api_dict[f.name] = FunctionApi(f.name, index, annotations,
                                                  f.return_type,
                                                  f.args, api_name)

for name, val in global_vars.items():
        index, type = val
        multiarray_api_dict[name] = GlobalVarApi(name, index, type, api_name)

for name, val in scalar_bool_values.items():
        index = val[0]
        multiarray_api_dict[name] = BoolValuesApi(name, index, api_name)

for name, val in types_api.items():
        index = val[0]
        internal_type =  None if len(val) == 1 else val[1]
        multiarray_api_dict[name] = TypeApi(
            name, index, 'PyTypeObject', api_name, internal_type)

if len(multiarray_api_dict) != len(multiarray_api_index):
        keys_dict = set(multiarray_api_dict.keys())
        keys_index = set(multiarray_api_index.keys())
        raise AssertionError(
            "Multiarray API size mismatch - "
            "index has extra keys {}, dict has extra keys {}"
            .format(keys_index - keys_dict, keys_dict - keys_index)
        )

extension_list = []
    for name, index in genapi.order_dict(multiarray_api_index):
        api_item = multiarray_api_dict[name]
        extension_list.append(api_item.define_from_array_api_string())
        init_list.append(api_item.array_api_define())
        module_list.append(api_item.internal_define())

# Write to header
    s = h_template % ('\n'.join(module_list), '\n'.join(extension_list))
    genapi.write_file(header_file, s)

# Write to c-code
    s = c_template % ',\n'.join(init_list)
    genapi.write_file(c_file, s)

return targets

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-o",
        "--outdir",
        type=str,
        help="Path to the output directory"
    )
    parser.add_argument(
        "-i",
        "--ignore",
        type=str,
        help="An ignored input - may be useful to add a "
             "dependency between custom targets"
    )
    args = parser.parse_args()

outdir_abs = os.path.join(os.getcwd(), args.outdir)

generate_api(outdir_abs)

if __name__ == "__main__":
    main()

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📝 generate_numpy_api.py

📝 generate_numpy_api.py

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