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visit_reachable: replace release-mode test with an assert. #16866

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Merged
merged 1 commit into from
Oct 21, 2019
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visit_reachable: replace release-mode test with an assert. #16866

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7 changes: 5 additions & 2 deletions Modules/gcmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -468,13 +468,16 @@ visit_reachable(PyObject *op, PyGC_Head *reachable)
PyGC_Head *gc = AS_GC(op);
const Py_ssize_t gc_refs = gc_get_refs(gc);

// Ignore untracked objects and objects in other generation.
// Ignore objects in other generation.
// This also skips objects "to the left" of the current position in
// move_unreachable's scan of the 'young' list - they've already been
// traversed, and no longer have the PREV_MASK_COLLECTING flag.
if (gc->_gc_next == 0 || !gc_is_collecting(gc)) {
if (! gc_is_collecting(gc)) {
return 0;
}
// It would be a logic error elsewhere if the collecting flag were set on
// an untracked object.
assert(gc->_gc_next != 0);

if (gc->_gc_next & NEXT_MASK_UNREACHABLE) {
/* This had gc_refs = 0 when move_unreachable got
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