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bpo-35059: Convert _PyObject_GC_TRACK() to inline function (GH-10643)

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* Add _PyObject_ASSERT_FROM() and _PyObject_ASSERT_FAILED_MSG()
  macros.
* PyObject_GC_Track() now calls _PyObject_ASSERT_FAILED_MSG(),
  instead of Py_FatalError(), if the object is already tracked, to
  dump more information on error.
* _PyObject_GC_TRACK() no longer checks if the object is already
  tracked at runtime, use an assertion instead for best performances;
  PyObject_GC_Track() still checks at runtime.
* pycore_object.h now includes pycore_pystate.h.
* Convert _PyObject_GC_TRACK() and _PyObject_GC_UNTRACK() macros to
  inline functions.
This commit is contained in:
Victor Stinner 2018-11-22 01:02:54 +01:00 • committed by GitHub
parent f1d002c1e0
commit 271753a27a
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 68 additions and 42 deletions
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70
Include/internal/pycore_object.h
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@ -8,6 +8,8 @@ extern "C" {
# error "this header requires Py_BUILD_CORE or Py_BUILD_CORE_BUILTIN defined"
#endif
#include "pycore_pystate.h" /* _PyRuntime */
/* Tell the GC to track this object.
*
* NB: While the object is tracked by the collector, it must be safe to call the
@ -19,36 +21,56 @@ extern "C" {
*
* The PyObject_GC_Track() function is the public version of this macro.
*/
#define _PyObject_GC_TRACK(o) do { \
PyGC_Head *g = _Py_AS_GC(o); \
if (g->_gc_next != 0) { \
Py_FatalError("GC object already tracked"); \
} \
assert((g->_gc_prev & _PyGC_PREV_MASK_COLLECTING) == 0); \
PyGC_Head *last = (PyGC_Head*)(_PyRuntime.gc.generation0->_gc_prev); \
_PyGCHead_SET_NEXT(last, g); \
_PyGCHead_SET_PREV(g, last); \
_PyGCHead_SET_NEXT(g, _PyRuntime.gc.generation0); \
_PyRuntime.gc.generation0->_gc_prev = (uintptr_t)g; \
} while (0);
static inline void _PyObject_GC_TRACK_impl(const char *filename, int lineno,
PyObject *op)
{
_PyObject_ASSERT_FROM(op, !_PyObject_GC_IS_TRACKED(op),
"object already tracked by the garbage collector",
filename, lineno, "_PyObject_GC_TRACK");
PyGC_Head *gc = _Py_AS_GC(op);
_PyObject_ASSERT_FROM(op,
(gc->_gc_prev & _PyGC_PREV_MASK_COLLECTING) == 0,
"object is in generation which is garbage collected",
filename, lineno, "_PyObject_GC_TRACK");
PyGC_Head *last = (PyGC_Head*)(_PyRuntime.gc.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;
}
#define _PyObject_GC_TRACK(op) \
_PyObject_GC_TRACK_impl(__FILE__, __LINE__, (PyObject *)(op))
/* Tell the GC to stop tracking this object.
*
* Internal note: This may be called while GC. So _PyGC_PREV_MASK_COLLECTING must
* be cleared. But _PyGC_PREV_MASK_FINALIZED bit is kept.
* Internal note: This may be called while GC. So _PyGC_PREV_MASK_COLLECTING
* must be cleared. But _PyGC_PREV_MASK_FINALIZED bit is kept.
*
* The object must be tracked by the GC.
*
* The PyObject_GC_UnTrack() function is the public version of this macro.
*/
#define _PyObject_GC_UNTRACK(o) do { \
PyGC_Head *g = _Py_AS_GC(o); \
PyGC_Head *prev = _PyGCHead_PREV(g); \
PyGC_Head *next = _PyGCHead_NEXT(g); \
assert(next != NULL); \
_PyGCHead_SET_NEXT(prev, next); \
_PyGCHead_SET_PREV(next, prev); \
g->_gc_next = 0; \
g->_gc_prev &= _PyGC_PREV_MASK_FINALIZED; \
} while (0);
static inline void _PyObject_GC_UNTRACK_impl(const char *filename, int lineno,
PyObject *op)
{
_PyObject_ASSERT_FROM(op, _PyObject_GC_IS_TRACKED(op),
"object not tracked by the garbage collector",
filename, lineno, "_PyObject_GC_UNTRACK");
PyGC_Head *gc = _Py_AS_GC(op);
PyGC_Head *prev = _PyGCHead_PREV(gc);
PyGC_Head *next = _PyGCHead_NEXT(gc);
_PyGCHead_SET_NEXT(prev, next);
_PyGCHead_SET_PREV(next, prev);
gc->_gc_next = 0;
gc->_gc_prev &= _PyGC_PREV_MASK_FINALIZED;
}
#define _PyObject_GC_UNTRACK(op) \
_PyObject_GC_UNTRACK_impl(__FILE__, __LINE__, (PyObject *)(op))
#ifdef __cplusplus
}