8000 GH-94262: Don't create frame objects for frames that aren't complete. by markshannon · Pull Request #94371 · python/cpython · GitHub
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GH-94262: Don't create frame objects for frames that aren't complete. #94371

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Merged
merged 11 commits into from
Jul 1, 2022
Merged

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

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87e97ae
Add test for creating frame object when making a generator.
markshannon Jun 27, 2022
583d164
Don't expose incomplete frames as frame objects.
markshannon Jun 27, 2022
5043a8b
Add news
markshannon Jun 28, 2022
e81c1f3
Cleanup after test.
markshannon Jun 28, 2022
6d07165
Explain _PyFrame_IsIncomplete()
markshannon Jun 28, 2022
ce0d4b5
Try harder to break things
markshannon Jun 28, 2022
f56451b
Avoid creating frame objects for incomplete frames vai f_back.
markshannon Jun 28, 2022
b69e803
Fix test
markshannon Jun 28, 2022
c648d46
Assert frame is valid when creating frame object.
markshannon Jun 28, 2022
cf0b32c
Prevent test polluting environment
markshannon Jun 28, 2022
939769c
Create all frames on stack from finalizer.
markshannon Jun 29, 2022
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Assert frame is valid when creating frame object.
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@markshannon
markshannon committed Jun 28, 2022
commit c648d46ec789782cade7541c5182fc476ce1fe52
27 changes: 17 additions & 10 deletions Include/internal/pycore_frame.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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 *
Expand All @@ -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;
Expand Down Expand Up @@ -210,16 +227,6 @@ PyGenObject *_PyFrame_GetGenerator(_PyInterpreterFrame *frame)
return (PyGenObject *)(((char *)frame) - offset_in_gen);
}

/* Determine whether a frame is incomplete.
* A frame is incomplete until the first RESUME instruction
* as it may be part way through creating cell objects or a
* generator or coroutine. */
static inline bool
_PyFrame_IsIncomplete(_PyInterpreterFrame *frame)
{
return frame->prev_instr < _PyCode_CODE(frame->f_code) + frame->f_code->_co_firsttraceable;
}

#ifdef __cplusplus
}
#endif
Expand Down
11 changes: 5 additions & 6 deletions Objects/codeobject.c
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Expand Up @@ -638,11 +638,10 @@ PyCode_New(int argcount, int kwonlyargcount,
exceptiontable);
}

static const char assert0[4] = {
LOAD_ASSERTION_ERROR,
0,
RAISE_VARARGS,
1
static const char assert0[6] = {
RESUME, 0,
LOAD_ASSERTION_ERROR, 0,
RAISE_VARARGS, 1
};

PyCodeObject *
Expand All @@ -666,7 +665,7 @@ PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
if (filename_ob == NULL) {
goto failed;
}
code_ob = PyBytes_FromStringAndSize(assert0, 4);
code_ob = PyBytes_FromStringAndSize(assert0, 6);
if (code_ob == NULL) {
goto failed;
}
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0