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gh-116946: fully implement GC protocol for lzma objects #138288

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Merged
merged 4 commits into from
Sep 1, 2025
Merged

gh-116946: fully implement GC protocol for lzma objects #138288

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5d6ee9c
fully implement GC protocol for `lzma` objects
picnixz Aug 31, 2025
d32a93a
use `PyObject_GC_Del` for clarity
picnixz Aug 31, 2025
c13af3c
reduce diff for 3.14 and later
picnixz Aug 31, 2025
a76e4bc
smash diff
picnixz Aug 31, 2025
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10 changes: 6 additions & 4 deletions Modules/_lzmamodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -866,12 +866,13 @@ 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 Down Expand Up @@ -933,7 +934,7 @@ 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),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.slots = lzma_compressor_type_slots,
};

Expand Down Expand Up @@ -1314,6 +1315,8 @@ _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 @@ -1323,7 +1326,6 @@ 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 Down Expand Up @@ -1381,7 +1383,7 @@ 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),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.slots = lzma_decompressor_type_slots,
};

Expand Down
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