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[3.13] gh-116946: Revert GC protocol for immutable empty heap types (GH-138322, GH-138323, GH-138326) by picnixz · Pull Request #138337 · python/cpython · GitHub

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[3.13] gh-116946: Revert GC protocol for immutable empty heap types (GH-138322, GH-138323, GH-138326) #138337

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Merged
kumaraditya303 merged 3 commits into from
Sep 1, 2025
Conversation 0 Commits 3 Checks 37 Files changed
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[3.13] gh-116946: Revert GC protocol for immutable empty heap types (GH-138322, GH-138323, GH-138326) #138337

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50e1b6e
Revert "[3.13] gh-116946: fully implement GC protocol for `bz2` objec…
picnixz Sep 1, 2025
505032c
Revert "[3.13] gh-116946: fully implement GC protocol for `lzma` obje…
picnixz Sep 1, 2025
586c906
Revert "[3.13] gh-116946: fully implement GC protocol for `_hashlib` …
picnixz Sep 1, 2025
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28 changes: 11 additions & 17 deletions Modules/_bz2module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -129,9 +129,6 @@ typedef struct {
PyThread_type_lock lock;
} BZ2Decompressor;

#define _BZ2Compressor_CAST(op) ((BZ2Compressor *)(op))
#define _BZ2Decompressor_CAST(op) ((BZ2Decompressor *)(op))

/* Helper functions. */

static int
Expand Down Expand Up @@ -379,21 +376,19 @@ _bz2_BZ2Compressor_impl(PyTypeObject *type, int compresslevel)
}

static void
BZ2Compressor_dealloc(PyObject *op)
BZ2Compressor_dealloc(BZ2Compressor *self)
{
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);
}

static int
BZ2Compressor_traverse(PyObject *self, visitproc visit, void *arg)
BZ2Compressor_traverse(BZ2Compressor *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -421,7 +416,7 @@ 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 Down Expand Up @@ -685,11 +680,8 @@ _bz2_BZ2Decompressor_impl(PyTypeObject *type)
}

static void
BZ2Decompressor_dealloc(PyObject *op)
BZ2Decompressor_dealloc(BZ2Decompressor *self)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
BZ2Decompressor *self = _BZ2Decompressor_CAST(op);
if(self->input_buffer != NULL) {
PyMem_Free(self->input_buffer);
}
Expand All @@ -698,12 +690,14 @@ BZ2Decompressor_dealloc(PyObject *op)
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);
}

static int
BZ2Decompressor_traverse(PyObject *self, visitproc visit, void *arg)
BZ2Decompressor_traverse(BZ2Decompressor *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -750,7 +744,7 @@ 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
91 changes: 23 additions & 68 deletions Modules/_hashopenssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -282,8 +282,6 @@ typedef struct {
PyMutex mutex; /* OpenSSL context lock */
} EVPobject;

#define EVPobject_CAST(op) ((EVPobject *)(op))

typedef struct {
PyObject_HEAD
HMAC_CTX *ctx; /* OpenSSL hmac context */
Expand All @@ -292,8 +290,6 @@ typedef struct {
PyMutex mutex; /* HMAC context lock */
} HMACobject;

#define HMACobject_CAST(op) ((HMACobject *)(op))

#include "clinic/_hashopenssl.c.h"
/*[clinic input]
module _hashlib
Expand Down Expand Up @@ -501,9 +497,7 @@ py_digest_by_digestmod(PyObject *module, PyObject *digestmod, enum Py_hash_type
static EVPobject *
newEVPobject(PyTypeObject *type)
{
assert(type != NULL);
assert(type->tp_alloc != NULL);
EVPobject *retval = (EVPobject *)type->tp_alloc(type, 0);
EVPobject *retval = (EVPobject *)PyObject_New(EVPobject, type);
if (retval == NULL) {
return NULL;
}
Expand Down Expand Up @@ -542,23 +536,14 @@ EVP_hash(EVPobject *self, const void *vp, Py_ssize_t len)
/* Internal methods for a hash object */

static void
EVP_dealloc(PyObject *op)
EVP_dealloc(EVPobject *self)
{
PyTypeObject *tp = Py_TYPE(op);
PyObject_GC_UnTrack(op);
EVPobject *self = EVPobject_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
EVP_traverse(PyObject *op, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(op));
return 0;
}

static int
locked_EVP_MD_CTX_copy(EVP_MD_CTX *new_ctx_p, EVPobject *self)
{
Expand Down Expand Up @@ -796,7 +781,6 @@ PyDoc_STRVAR(hashtype_doc,

static PyType_Slot EVPtype_slots[] = {
{Py_tp_dealloc, EVP_dealloc},
{Py_tp_traverse, EVP_traverse},
{Py_tp_repr, EVP_repr},
{Py_tp_doc, (char *)hashtype_doc},
{Py_tp_methods, EVP_methods},
Expand All @@ -805,16 +789,11 @@ static PyType_Slot EVPtype_slots[] = {
};

static PyType_Spec EVPtype_spec = {
.name = "_hashlib.HASH",
.basicsize = sizeof(EVPobject),
.flags = (
Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC
),
.slots = EVPtype_slots
"_hashlib.HASH", /*tp_name*/
sizeof(EVPobject), /*tp_basicsize*/
0, /*tp_itemsize*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_DISALLOW_INSTANTIATION | Py_TPFLAGS_IMMUTABLETYPE,
EVPtype_slots
};

#ifdef PY_OPENSSL_HAS_SHAKE
Expand Down Expand Up @@ -955,25 +934,18 @@ PyDoc_STRVAR(hashxoftype_doc,
"digest_size -- number of bytes in this hashes output");

static PyType_Slot EVPXOFtype_slots[] = {
{Py_tp_dealloc, EVP_dealloc},
{Py_tp_traverse, EVP_traverse},
{Py_tp_doc, (char *)hashxoftype_doc},
{Py_tp_methods, EVPXOF_methods},
{Py_tp_getset, EVPXOF_getseters},
{0, 0},
};

static PyType_Spec EVPXOFtype_spec = {
.name = "_hashlib.HASHXOF",
.basicsize = sizeof(EVPobject),
.flags = (
Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_DISALLOW_INSTANTIATION
| Py_TPFLAGS_IMMUTABLETYPE
| Py_TPFLAGS_HAVE_GC
),
.slots = EVPXOFtype_slots
"_hashlib.HASHXOF", /*tp_name*/
sizeof(EVPobject), /*tp_basicsize*/
0, /*tp_itemsize*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_DISALLOW_INSTANTIATION | Py_TPFLAGS_IMMUTABLETYPE,
EVPXOFtype_slots
};


Expand Down Expand Up @@ -1687,8 +1659,7 @@ _hashlib_hmac_new_impl(PyObject *module, Py_buffer *key, PyObject *msg_obj,
}

_hashlibstate *state = get_hashlib_state(module);
assert(state->HMACtype != NULL);
self = (HMACobject *)state->HMACtype->tp_alloc(state->HMACtype, 0);
self = PyObject_New(HMACobject, state->HMACtype);
if (self == NULL) {
goto error;
}
Expand Down Expand Up @@ -1793,8 +1764,7 @@ _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 @@ -1806,26 +1776,17 @@ _hashlib_HMAC_copy_impl(HMACobject *self)
}

static void
_hmac_dealloc(PyObject *op)
_hmac_dealloc(HMACobject *self)
{
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
_hmac_traverse(PyObject *op, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(op));
return 0;
}

static PyObject *
_hmac_repr(HMACobject *self)
{
Expand Down Expand Up @@ -1993,22 +1954,16 @@ digest_size -- number of bytes in digest() output\n");
static PyType_Slot HMACtype_slots[] = {
{Py_tp_doc, (char *)hmactype_doc},
{Py_tp_repr, (reprfunc)_hmac_repr},
{Py_tp_dealloc, _hmac_dealloc},
{Py_tp_traverse, _hmac_traverse},
{Py_tp_dealloc,(destructor)_hmac_dealloc},
{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
27 changes: 10 additions & 17 deletions Modules/_lzmamodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -126,9 +126,6 @@ typedef struct {
PyThread_type_lock lock;
} Decompressor;

#define Compressor_CAST(op) ((Compressor *)(op))
#define Decompressor_CAST(op) ((Decompressor *)(op))

/* Helper functions. */

static int
Expand Down Expand Up @@ -860,16 +857,14 @@ Compressor_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
}

static void
Compressor_dealloc(PyObject *op)
Compressor_dealloc(Compressor *self)
{
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);
}
tp->tp_free(self);
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
Py_DECREF(tp);
}

Expand All @@ -880,7 +875,7 @@ static PyMethodDef Compressor_methods[] = {
};

static int
Compressor_traverse(PyObject *self, visitproc visit, void *arg)
Compressor_traverse(Compressor *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -930,7 +925,7 @@ 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 Down Expand Up @@ -1309,11 +1304,8 @@ _lzma_LZMADecompressor_impl(PyTypeObject *type, int format,
}

static void
Decompressor_dealloc(PyObject *op)
Decompressor_dealloc(Decompressor *self)
{
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 @@ -1322,12 +1314,13 @@ Decompressor_dealloc(PyObject *op)
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);
}

static int
Decompressor_traverse(PyObject *self, visitproc visit, void *arg)
Decompressor_traverse(Decompressor *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
Expand Down Expand Up @@ -1379,7 +1372,7 @@ 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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