mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 08:59:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

gh-117139: Garbage collector support for deferred refcounting (#122956)

Browse source 
The free-threaded GC now visits interpreter stacks to keep objects
that use deferred reference counting alive.

Interpreter frames are zero initialized in the free-threaded GC so
that the GC doesn't see garbage data. This is a temporary measure
until stack spilling around escaping calls is implemented.

Co-authored-by: Ken Jin <kenjin@python.org>
This commit is contained in:
Sam Gross 2024-08-15 12:09:11 -04:00 • committed by GitHub
parent 1dad23edbc
commit e001027188
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
6 changed files with 121 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

11
Python/gc.c
View file

@ -534,6 +534,17 @@ visit_decref(PyObject *op, void *parent)
return 0;
}
int
_PyGC_VisitFrameStack(_PyInterpreterFrame *frame, visitproc visit, void *arg)
{
_PyStackRef *ref = _PyFrame_GetLocalsArray(frame);
/* locals and stack */
for (; ref < frame->stackpointer; ref++) {
Py_VISIT(PyStackRef_AsPyObjectBorrow(*ref));
}
return 0;
}
/* Subtract internal references from gc_refs. After this, gc_refs is >= 0
* for all objects in containers, and is GC_REACHABLE for all tracked gc
* objects not in containers. The ones with gc_refs > 0 are directly