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| author | Sam Gross <colesbury@gmail.com> | 2024-08-15 16:09:11 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-08-15 16:09:11 (GMT) |
| commit | e001027188001f4bdf6ea16f70726ca0fabe85c4 (patch) | |
| tree | 49ef595c47159c755e5e847f1aac863da92cc330 /Python/gc.c | |
| parent | 1dad23edbc9db3a13268c1000c8dd428edba29f8 (diff) | |
| download | cpython-e001027188001f4bdf6ea16f70726ca0fabe85c4.zip cpython-e001027188001f4bdf6ea16f70726ca0fabe85c4.tar.gz cpython-e001027188001f4bdf6ea16f70726ca0fabe85c4.tar.bz2 | |
gh-117139: Garbage collector support for deferred refcounting (#122956)
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>
Diffstat (limited to 'Python/gc.c')
| -rw-r--r-- | Python/gc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Python/gc.c b/Python/gc.c index 38a0da9..923a792 100644 --- a/Python/gc.c +++ b/Python/gc.c @@ -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 |