50 // update_refs() set this bit for all objects in current generation.
193     to gc_refs, for each object in the generation being collected.
195     times an object is referenced directly from outside the generation
199     Objects in generation being collected are marked PREV_MASK_COLLECTING in
218     indirectly) from outside the generation into an "unreachable" set and
455          * generation being collected, which can be recognized  in visit_decref()
495     // Ignore objects in other generation.  in visit_reachable()
748  * weakrefs with callbacks may be moved into the `old` generation.  Objects
832              *    outside the current generation, CT may be reachable from the  in handle_weakrefs()
843              * root to this generation, and therefore its callback did too.  So  in handle_weakrefs()
1030  * All free lists are cleared during the collection of the highest generation.
1059         "gc: objects in each generation:%s\n"  in show_stats_each_generations()
1060         "gc: objects in permanent generation: %zd\n",  in show_stats_each_generations()
1112      * generation in the same order.  If B points to A, and C to B, and C is  in deduce_unreachable()
1171     // Move the resurrected objects to the old generation for future collection.  in handle_resurrected_objects()
1178 gc_collect_main(PyThreadState *tstate, int generation,  in gc_collect_main()  argument
1185     PyGC_Head *young; /* the generation we are examining */  in gc_collect_main()
1186     PyGC_Head *old; /* next older generation */  in gc_collect_main()
1199         PySys_WriteStderr("gc: collecting generation %d...\n", generation);  in gc_collect_main()
1205         PyDTrace_GC_START(generation);  in gc_collect_main()
1208     if (generation+1 < NUM_GENERATIONS)  in gc_collect_main()
1209         gcstate->generations[generation+1].count += 1;  in gc_collect_main()
1210     for (i = 0; i <= generation; i++)  in gc_collect_main()
1214     for (i = 0; i < generation; i++) {  in gc_collect_main()
1215         gc_list_merge(GEN_HEAD(gcstate, i), GEN_HEAD(gcstate, generation));  in gc_collect_main()
1219     young = GEN_HEAD(gcstate, generation);  in gc_collect_main()
1220     if (generation < NUM_GENERATIONS-1)  in gc_collect_main()
1221         old = GEN_HEAD(gcstate, generation+1);  in gc_collect_main()
1229     /* Move reachable objects to next generation. */  in gc_collect_main()
1231         if (generation == NUM_GENERATIONS - 2) {  in gc_collect_main()
1311      * generation */  in gc_collect_main()
1312     if (generation == NUM_GENERATIONS-1) {  in gc_collect_main()
1333     struct gc_generation_stats *stats = &gcstate->generation_stats[generation];  in gc_collect_main()
1351                    int generation, Py_ssize_t collected,  in invoke_gc_callback()  argument
1367             "generation", generation,  in invoke_gc_callback()
1391 /* Perform garbage collection of a generation and invoke
1395 gc_collect_with_callback(PyThreadState *tstate, int generation)  in gc_collect_with_callback()  argument
1399     invoke_gc_callback(tstate, "start", generation, 0, 0);  in gc_collect_with_callback()
1400     result = gc_collect_main(tstate, generation, &collected, &uncollectable, 0);  in gc_collect_with_callback()
1401     invoke_gc_callback(tstate, "stop", generation, collected, uncollectable);  in gc_collect_with_callback()
1410     /* Find the oldest generation (highest numbered) where the count  in gc_collect_generations()
1411      * exceeds the threshold.  Objects in the that generation and  in gc_collect_generations()
1508     generation: int(c_default="NUM_GENERATIONS - 1") = 2
1513 may be an integer specifying which generation to collect.  A ValueError
1514 is raised if the generation number is invalid.
1520 gc_collect_impl(PyObject *module, int generation)  in gc_collect_impl()  argument
1525     if (generation < 0 || generation >= NUM_GENERATIONS) {  in gc_collect_impl()
1526         _PyErr_SetString(tstate, PyExc_ValueError, "invalid generation");  in gc_collect_impl()
1538         n = gc_collect_with_callback(tstate, generation);  in gc_collect_impl()
1738     generation: Py_ssize_t(accept={int, NoneType}, c_default="-1") = None
1739         Generation to extract the objects from.
1743 If generation is not None, return only the objects tracked by the collector
1744 that are in that generation.
1748 gc_get_objects_impl(PyObject *module, Py_ssize_t generation)  in gc_get_objects_impl()  argument
1756     if (PySys_Audit("gc.get_objects", "n", generation) < 0) {  in gc_get_objects_impl()
1765     /* If generation is passed, we extract only that generation */  in gc_get_objects_impl()
1766     if (generation != -1) {  in gc_get_objects_impl()
1767         if (generation >= NUM_GENERATIONS) {  in gc_get_objects_impl()
1769                           "generation parameter must be less than the number of "  in gc_get_objects_impl()
1775         if (generation < 0) {  in gc_get_objects_impl()
1777                              "generation parameter cannot be negative");  in gc_get_objects_impl()
1781         if (append_objects(result, GEN_HEAD(gcstate, generation))) {  in gc_get_objects_impl()
1788     /* If generation is not passed or None, get all objects from all generations */  in gc_get_objects_impl()
1804 Return a list of dictionaries containing per-generation statistics.
1918 Unfreeze all objects in the permanent generation.
1920 Put all objects in the permanent generation back into oldest generation.
1936 Return the number of objects in the permanent generation.
1956 "get_stats() -- Return list of dictionaries containing per-generation stats.\n"
1967 "unfreeze() -- Unfreeze all objects in the permanent generation.\n"
1968 "get_freeze_count() -- Return the number of objects in the permanent generation.\n");