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bpo-41798: Allocate unicodedata CAPI on the heap #24128

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Merged
merged 3 commits into from
Jan 20, 2021
Merged

bpo-41798: Allocate unicodedata CAPI on the heap #24128

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b354265
Allocate unicodedata CAPI on the heap
Jan 5, 2021
bf0e601
Address review: Use PyModule_AddObjectRef iso. PyModuel_AddObject
Jan 10, 2021
720ada4
Address review
Jan 20, 2021
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36 changes: 28 additions & 8 deletions Modules/unicodedata.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1308,10 +1308,24 @@ capi_getcode(const char* name, int namelen, Py_UCS4* code,

}

static const _PyUnicode_Name_CAPI unicodedata_capi =
static void
udc_destroy_capi(PyObject *capsule)
{
void *capi = PyCapsule_GetPointer(capsule, PyUnicodeData_CAPSULE_NAME);
PyMem_Free(capi);
}

static _PyUnicode_Name_CAPI *
udc_get_capi(void)
{
.getname = capi_getucname,
.getcode = capi_getcode,
_PyUnicode_Name_CAPI *capi = PyMem_Malloc(sizeof(_PyUnicode_Name_CAPI));
if (capi == NULL) {
PyErr_NoMemory();
return NULL;
}
capi->getname = capi_getucname;
capi->getcode = capi_getcode;
return capi;
};


Expand Down Expand Up @@ -1477,13 +1491,19 @@ unicodedata_exec(PyObject *module)
}

/* Export C API */
v = PyCapsule_New((void *)&unicodedata_capi, PyUnicodeData_CAPSULE_NAME,
NULL);
if (v == NULL) {
_PyUnicode_Name_CAPI *capi = udc_get_capi();
if (capi == NULL) {
return -1;
}
if (PyModule_AddObject(module, "_ucnhash_CAPI", v) < 0) {
Py_DECREF(v);
PyObject *capsule = PyCapsule_New(capi,
PyUnicodeData_CAPSULE_NAME,
udc_destroy_capi);
if (capsule == NULL) {
PyMem_Free(capi);
return -1;
}
if (PyModule_AddObject(module, "_ucnhash_CAPI", capsule) < 0) {
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How about using PyModule_AddObjectRef in here too?

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We could do that, but I'm not sure it would improve this code. What do you think?

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PyModule_AddObjectRef() is more easy to understand than PyModule_AddObject(), because PyModule_AddObject() will steal the refs sometimes.

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After thinking about it, I do agree. It's easier to follow the ref count when reading the code. I'll change it. Thanks!

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Should I change the other PyModule_AddObject in unicodedata_exec() while we're there?

Py_DECREF(capsule);
return -1;
}
return 0;
Expand Down