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bpo-36854: gcmodule.c gets its state from tstate #17285

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Merged
vstinner merged 1 commit into from
Nov 20, 2019
Merged

bpo-36854: gcmodule.c gets its state from tstate #17285

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10 changes: 6 additions & 4 deletions Include/internal/pycore_object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ PyAPI_FUNC(int) _PyDict_CheckConsistency(PyObject *mp, int check_content);
* NB: While the object is tracked by the collector, it must be safe to call the
* ob_traverse method.
*
* Internal note: _PyRuntime.gc.generation0->_gc_prev doesn't have any bit flags
* Internal note: interp->gc.generation0->_gc_prev doesn't have any bit flags
* because it's not object header. So we don't use _PyGCHead_PREV() and
* _PyGCHead_SET_PREV() for it to avoid unnecessary bitwise operations.
*
Expand All @@ -37,11 +37,13 @@ static inline void _PyObject_GC_TRACK_impl(const char *filename, int lineno,
"object is in generation which is garbage collected",
filename, lineno, "_PyObject_GC_TRACK");

PyGC_Head *last = (PyGC_Head*)(_PyRuntime.gc.generation0->_gc_prev);
PyThreadState *tstate = _PyThreadState_GET();
PyGC_Head *generation0 = tstate->interp->runtime->gc.generation0;
PyGC_Head *last = (PyGC_Head*)(generation0->_gc_prev);
_PyGCHead_SET_NEXT(last, gc);
_PyGCHead_SET_PREV(gc, last);
_PyGCHead_SET_NEXT(gc, _PyRuntime.gc.generation0);
_PyRuntime.gc.generation0->_gc_prev = (uintptr_t)gc;
_PyGCHead_SET_NEXT(gc, generation0);
generation0->_gc_prev = (uintptr_t)gc;
}

#define _PyObject_GC_TRACK(op) \
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2 changes: 1 addition & 1 deletion Include/internal/pycore_pylifecycle.h
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Expand Up @@ -89,7 +89,7 @@ extern void _PyWarnings_Fini(PyInterpreterState *interp);
extern void _PyGILState_Init(PyThreadState *tstate);
extern void _PyGILState_Fini(PyThreadState *tstate);

PyAPI_FUNC(void) _PyGC_DumpShutdownStats(struct pyruntimestate *runtime);
PyAPI_FUNC(void) _PyGC_DumpShutdownStats(PyThreadState *tstate);

PyAPI_FUNC(PyStatus) _Py_PreInitializeFromPyArgv(
const PyPreConfig *src_config,
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