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GH-94262: Don't create frame objects for frames that aren't yet complete. (GH-94371)

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Mark Shannon 2022-07-01 11:08:20 +01:00 • committed by GitHub
parent 1df9449db2
commit 544531de23
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7 changed files with 87 additions and 13 deletions
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17
Include/internal/pycore_frame.h
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@ -134,6 +134,21 @@ _PyFrame_SetStackPointer(_PyInterpreterFrame *frame, PyObject **stack_pointer)
frame->stacktop = (int)(stack_pointer - frame->localsplus);
}
/* Determine whether a frame is incomplete.
* A frame is incomplete if it is part way through
* creating cell objects or a generator or coroutine.
*
* Frames on the frame stack are incomplete until the
* first RESUME instruction.
* Frames owned by a generator are always complete.
*/
static inline bool
_PyFrame_IsIncomplete(_PyInterpreterFrame *frame)
{
return frame->owner != FRAME_OWNED_BY_GENERATOR &&
frame->prev_instr < _PyCode_CODE(frame->f_code) + frame->f_code->_co_firsttraceable;
}
/* For use by _PyFrame_GetFrameObject
Do not call directly. */
PyFrameObject *
@ -145,6 +160,8 @@ _PyFrame_MakeAndSetFrameObject(_PyInterpreterFrame *frame);
static inline PyFrameObject *
_PyFrame_GetFrameObject(_PyInterpreterFrame *frame)
{
assert(!_PyFrame_IsIncomplete(frame));
PyFrameObject *res = frame->frame_obj;
if (res != NULL) {
return res;