From 9d3f5384716ab068414cfbfe230a3b94e119a921 Mon Sep 17 00:00:00 2001
From: Donghee Na <donghee.na@python.org>
Date: Thu, 27 Mar 2025 02:43:16 +0900
Subject: [PATCH] =?utf8?q?[3.13]=20gh-131740:=20Update=20PyUnstable=5FGC?=
 =?utf8?q?=5FVisitObjects=20to=20traverse=20perm=20=E2=80=A6=20(gh-131754)?=
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* [3.13] gh-131740: Update PyUnstable_GC_VisitObjects to traverse perm gen (gh-131744)

(cherry picked from commit 7bb41aef4b7b8f3c3f07c11b801c5b7f8afaac7f)

* fix
---
 ...-03-26-06-56-40.gh-issue-131740.9PdxxQ.rst |  1 +
 Python/gc.c                                   | 30 ++++++++++++-------
 2 files changed, 21 insertions(+), 10 deletions(-)
 create mode 100644 Misc/NEWS.d/next/C API/2025-03-26-06-56-40.gh-issue-131740.9PdxxQ.rst

diff --git a/Misc/NEWS.d/next/C API/2025-03-26-06-56-40.gh-issue-131740.9PdxxQ.rst b/Misc/NEWS.d/next/C API/2025-03-26-06-56-40.gh-issue-131740.9PdxxQ.rst
new file mode 100644
index 000000000000..585f07aaddd8
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2025-03-26-06-56-40.gh-issue-131740.9PdxxQ.rst	
@@ -0,0 +1 @@
+Update PyUnstable_GC_VisitObjects to traverse perm gen.
diff --git a/Python/gc.c b/Python/gc.c
index 8dbcb340d408..81871c5f3d6b 100644
--- a/Python/gc.c
+++ b/Python/gc.c
@@ -1966,6 +1966,23 @@ PyObject_GC_IsFinalized(PyObject *obj)
     return 0;
 }
 
+static int
+visit_generation(gcvisitobjects_t callback, void *arg, struct gc_generation *gen)
+{
+    PyGC_Head *gc_list, *gc;
+    gc_list = &gen->head;
+    for (gc = GC_NEXT(gc_list); gc != gc_list; gc = GC_NEXT(gc)) {
+        PyObject *op = FROM_GC(gc);
+        Py_INCREF(op);
+        int res = callback(op, arg);
+        Py_DECREF(op);
+        if (!res) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
 void
 PyUnstable_GC_VisitObjects(gcvisitobjects_t callback, void *arg)
 {
@@ -1974,18 +1991,11 @@ PyUnstable_GC_VisitObjects(gcvisitobjects_t callback, void *arg)
     int origenstate = gcstate->enabled;
     gcstate->enabled = 0;
     for (i = 0; i < NUM_GENERATIONS; i++) {
-        PyGC_Head *gc_list, *gc;
-        gc_list = GEN_HEAD(gcstate, i);
-        for (gc = GC_NEXT(gc_list); gc != gc_list; gc = GC_NEXT(gc)) {
-            PyObject *op = FROM_GC(gc);
-            Py_INCREF(op);
-            int res = callback(op, arg);
-            Py_DECREF(op);
-            if (!res) {
-                goto done;
-            }
+        if (visit_generation(callback, arg, &gcstate->generations[i])) {
+            goto done;
         }
     }
+    visit_generation(callback, arg, &gcstate->permanent_generation);
 done:
     gcstate->enabled = origenstate;
 }
-- 
2.47.3