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gh-116946: Revert GC protocol for immutable empty heap types (GH-138266, GH-138288, GH-138289)#138338

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Merged
kumaraditya303 merged 3 commits into from
Sep 1, 2025
Merged

gh-116946: Revert GC protocol for immutable empty heap types (GH-138266, GH-138288, GH-138289) #138338

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131bab6
Revert "gh-116946: fully implement GC protocol for `bz2` objects (#13…
picnixz Sep 1, 2025
fa86d1d
Revert "gh-116946: fully implement GC protocol for `lzma` objects (#1…
picnixz Sep 1, 2025
dc8f5a0
Revert "gh-116946: fully implement GC protocol for `_hashlib` objects…
picnixz Sep 1, 2025
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17 changes: 8 additions & 9 deletions Modules/_bz2module.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -381,14 +381,13 @@ _bz2_BZ2Compressor_impl(PyTypeObject *type, int compresslevel)
static void
BZ2Compressor_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
BZ2Compressor *self = _BZ2Compressor_CAST(op);
BZ2_bzCompressEnd(&self->bzs);
if (self->lock != NULL){
PyThread_free_lock(self->lock);
}
tp->tp_free(self);
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
Py_DECREF(tp);
}

Expand DownExpand Up@@ -421,7 +420,7 @@ static PyType_Spec bz2_compressor_type_spec ={
// bz2_compressor_type_spec does not have Py_TPFLAGS_BASETYPE flag
// which prevents to create a subclass.
// So calling PyType_GetModuleState() in this file is always safe.
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE),
.slots = bz2_compressor_type_slots,
};

Expand DownExpand Up@@ -688,19 +687,19 @@ _bz2_BZ2Decompressor_impl(PyTypeObject *type)
static void
BZ2Decompressor_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
BZ2Decompressor *self = _BZ2Decompressor_CAST(op);

if(self->input_buffer != NULL){
if(self->input_buffer != NULL){
PyMem_Free(self->input_buffer);
}
BZ2_bzDecompressEnd(&self->bzs);
Py_CLEAR(self->unused_data);
if (self->lock != NULL){
PyThread_free_lock(self->lock);
}
tp->tp_free(self);

PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
Py_DECREF(tp);
}

Expand DownExpand Up@@ -752,7 +751,7 @@ static PyType_Spec bz2_decompressor_type_spec ={
// bz2_decompressor_type_spec does not have Py_TPFLAGS_BASETYPE flag
// which prevents to create a subclass.
// So calling PyType_GetModuleState() in this file is always safe.
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE),
.slots = bz2_decompressor_type_slots,
};

Expand Down
51 changes: 10 additions & 41 deletions Modules/_hashopenssl.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -752,9 +752,7 @@ py_wrapper_EVP_MD_CTX_new(void)
static HASHobject *
new_hash_object(PyTypeObject *type)
{
assert(type != NULL);
assert(type->tp_alloc != NULL);
HASHobject *retval = (HASHobject *)type->tp_alloc(type, 0);
HASHobject *retval = PyObject_New(HASHobject, type);
if (retval == NULL){
return NULL;
}
Expand DownExpand Up@@ -794,21 +792,13 @@ _hashlib_HASH_hash(HASHobject *self, const void *vp, Py_ssize_t len)
static void
_hashlib_HASH_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
HASHobject *self = HASHobject_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
EVP_MD_CTX_free(self->ctx);
tp->tp_free(self);
PyObject_Free(self);
Py_DECREF(tp);
}

static int
_hashlib_HASH_traverse(PyObject *op, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(op));
return 0;
}

static int
_hashlib_HASH_copy_locked(HASHobject *self, EVP_MD_CTX *new_ctx_p)
{
Expand DownExpand Up@@ -1003,7 +993,6 @@ PyDoc_STRVAR(HASHobject_type_doc,

static PyType_Slot HASHobject_type_slots[] ={
{Py_tp_dealloc, _hashlib_HASH_dealloc},
{Py_tp_traverse, _hashlib_HASH_traverse},
{Py_tp_repr, _hashlib_HASH_repr},
{Py_tp_doc, (char *)HASHobject_type_doc},
{Py_tp_methods, HASH_methods},
Expand All@@ -1019,7 +1008,6 @@ static PyType_Spec HASHobject_type_spec ={
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC
),
.slots = HASHobject_type_slots
};
Expand DownExpand Up@@ -1177,8 +1165,6 @@ PyDoc_STRVAR(HASHXOFobject_type_doc,
"digest_size -- number of bytes in this hashes output");

static PyType_Slot HASHXOFobject_type_slots[] ={
{Py_tp_dealloc, _hashlib_HASH_dealloc},
{Py_tp_traverse, _hashlib_HASH_traverse},
{Py_tp_doc, (char *)HASHXOFobject_type_doc},
{Py_tp_methods, HASHXOFobject_methods},
{Py_tp_getset, HASHXOFobject_getsets},
Expand All@@ -1193,7 +1179,6 @@ static PyType_Spec HASHXOFobject_type_spec ={
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC
),
.slots = HASHXOFobject_type_slots
};
Expand DownExpand Up@@ -1917,8 +1902,7 @@ _hashlib_hmac_new_impl(PyObject *module, Py_buffer *key, PyObject *msg_obj,
goto error;
}

assert(state->HMAC_type != NULL);
self = (HMACobject *)state->HMAC_type->tp_alloc(state->HMAC_type, 0);
self = PyObject_New(HMACobject, state->HMAC_type);
if (self == NULL){
goto error;
}
Expand DownExpand Up@@ -2024,8 +2008,7 @@ _hashlib_HMAC_copy_impl(HMACobject *self)
return NULL;
}

PyTypeObject *type = Py_TYPE(self);
retval = (HMACobject *)type->tp_alloc(type, 0);
retval = PyObject_New(HMACobject, Py_TYPE(self));
if (retval == NULL){
HMAC_CTX_free(ctx);
return NULL;
Expand All@@ -2039,24 +2022,16 @@ _hashlib_HMAC_copy_impl(HMACobject *self)
static void
_hmac_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
HMACobject *self = HMACobject_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
if (self->ctx != NULL){
HMAC_CTX_free(self->ctx);
self->ctx = NULL;
}
tp->tp_free(self);
PyObject_Free(self);
Py_DECREF(tp);
}

static int
_hashlib_HMAC_traverse(PyObject *op, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(op));
return 0;
}

static PyObject *
_hmac_repr(PyObject *op)
{
Expand DownExpand Up@@ -2223,21 +2198,15 @@ static PyType_Slot HMACtype_slots[] ={
{Py_tp_doc, (char *)hmactype_doc},
{Py_tp_repr, _hmac_repr},
{Py_tp_dealloc, _hmac_dealloc},
{Py_tp_traverse, _hashlib_HMAC_traverse},
{Py_tp_methods, HMAC_methods},
{Py_tp_getset, HMAC_getset},
{0, NULL}
};

PyType_Spec HMACtype_spec ={
.name = "_hashlib.HMAC",
.basicsize = sizeof(HMACobject),
.flags = (
Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC
),
"_hashlib.HMAC", /* name */
sizeof(HMACobject), /* basicsize */
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION | Py_TPFLAGS_IMMUTABLETYPE,
.slots = HMACtype_slots,
};

Expand Down
10 changes: 4 additions & 6 deletions Modules/_lzmamodule.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -866,13 +866,12 @@ Compressor_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
static void
Compressor_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
Compressor *self = Compressor_CAST(op);
lzma_end(&self->lzs);
if (self->lock != NULL){
PyThread_free_lock(self->lock);
}
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free(self);
Py_DECREF(tp);
}
Expand DownExpand Up@@ -934,7 +933,7 @@ static PyType_Spec lzma_compressor_type_spec ={
// lzma_compressor_type_spec does not have Py_TPFLAGS_BASETYPE flag
// which prevents to create a subclass.
// So calling PyType_GetModuleState() in this file is always safe.
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE),
.slots = lzma_compressor_type_slots,
};

Expand DownExpand Up@@ -1315,8 +1314,6 @@ _lzma_LZMADecompressor_impl(PyTypeObject *type, int format,
static void
Decompressor_dealloc(PyObject *op)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
Decompressor *self = Decompressor_CAST(op);
if(self->input_buffer != NULL)
PyMem_Free(self->input_buffer);
Expand All@@ -1326,6 +1323,7 @@ Decompressor_dealloc(PyObject *op)
if (self->lock != NULL){
PyThread_free_lock(self->lock);
}
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free(self);
Py_DECREF(tp);
}
Expand DownExpand Up@@ -1383,7 +1381,7 @@ static PyType_Spec lzma_decompressor_type_spec ={
// lzma_decompressor_type_spec does not have Py_TPFLAGS_BASETYPE flag
// which prevents to create a subclass.
// So calling PyType_GetModuleState() in this file is always safe.
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE),
.slots = lzma_decompressor_type_slots,
};

Expand Down
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