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#define _PY_INTERPRETER

#include "Python.h"

#include "pycore_frame.h" // _PyFrame_New_NoTrack()

#include "pycore_interpframe.h" // _PyFrame_GetCode()

#include "pycore_genobject.h" // _PyGen_GetGeneratorFromFrame()

#include "pycore_stackref.h" // _Py_VISIT_STACKREF()

int

_PyFrame_Traverse(_PyInterpreterFrame *frame, visitproc visit, void *arg)

{

Py_VISIT(frame->frame_obj);

Py_VISIT(frame->f_locals);

_Py_VISIT_STACKREF(frame->f_funcobj);

_Py_VISIT_STACKREF(frame->f_executable);

return _PyGC_VisitFrameStack(frame, visit, arg);

}

PyFrameObject *

_PyFrame_MakeAndSetFrameObject(_PyInterpreterFrame *frame)

{

PyObject *exc = PyErr_GetRaisedException();

PyFrameObject *f = _PyFrame_New_NoTrack(_PyFrame_GetCode(frame));

if (f == NULL) {

Py_XDECREF(exc);

return NULL;

}

PyErr_SetRaisedException(exc);

// GH-97002: There was a time when a frame object could be created when we

// are allocating the new frame object f above, so frame->frame_obj would

// be assigned already. That path does not exist anymore. We won't call any

// Python code in this function and garbage collection will not run.

// Notice that _PyFrame_New_NoTrack() can potentially raise a MemoryError,

// but it won't allocate a traceback until the frame unwinds, so we are safe

// here.

assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT);

f->f_frame = frame;

#ifdef Py_GIL_DISABLED

PyFrameObject *expected = NULL;

if (!_Py_atomic_compare_exchange_ptr(&frame->frame_obj, &expected, f)) {

Py_DECREF(f);

return expected;

}

#else

assert(frame->frame_obj == NULL);

frame->frame_obj = f;

#endif

return f;

}

static void

take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame)

{

Py_BEGIN_CRITICAL_SECTION(f);

assert(frame->owner < FRAME_OWNED_BY_INTERPRETER);

assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT);

_PyInterpreterFrame *new_frame = (_PyInterpreterFrame *)f->_f_frame_data;

_PyFrame_Copy(frame, new_frame);

// _PyFrame_Copy takes the reference to the executable,

// so we need to restore it.

new_frame->f_executable = PyStackRef_DUP(new_frame->f_executable);

f->f_frame = new_frame;

new_frame->owner = FRAME_OWNED_BY_FRAME_OBJECT;

if (_PyFrame_IsIncomplete(new_frame)) {

// This may be a newly-created generator or coroutine frame. Since it's

// dead anyways, just pretend that the first RESUME ran:

PyCodeObject *code = _PyFrame_GetCode(new_frame);

new_frame->instr_ptr =

_PyFrame_GetBytecode(new_frame) + code->_co_firsttraceable + 1;

}

assert(!_PyFrame_IsIncomplete(new_frame));

assert(f->f_back == NULL);

_PyInterpreterFrame *prev = _PyFrame_GetFirstComplete(frame->previous);

if (prev) {

assert(prev->owner < FRAME_OWNED_BY_INTERPRETER);

PyObject *exc = PyErr_GetRaisedException();

/* Link PyFrameObjects.f_back and remove link through _PyInterpreterFrame.previous */

PyFrameObject *back = _PyFrame_GetFrameObject(prev);

if (back == NULL) {

/* Memory error here. */

assert(PyErr_ExceptionMatches(PyExc_MemoryError));

/* Nothing we can do about it */

PyErr_Clear();

}

else {

f->f_back = (PyFrameObject *)Py_NewRef(back);

}

PyErr_SetRaisedException(exc);

}

if (!_PyObject_GC_IS_TRACKED((PyObject *)f)) {

_PyObject_GC_TRACK((PyObject *)f);

}

Py_END_CRITICAL_SECTION();

}

void

_PyFrame_ClearLocals(_PyInterpreterFrame *frame)

{

assert(frame->stackpointer != NULL);

_PyStackRef *sp = frame->stackpointer;

_PyStackRef *locals = frame->localsplus;

frame->stackpointer = locals;

while (sp > locals) {

sp--;

PyStackRef_XCLOSE(*sp);

}

Py_CLEAR(frame->f_locals);

}

void

_PyFrame_ClearExceptCode(_PyInterpreterFrame *frame)

{

/* It is the responsibility of the owning generator/coroutine

* to have cleared the enclosing generator, if any. */

assert(frame->owner != FRAME_OWNED_BY_GENERATOR ||

FT_ATOMIC_LOAD_INT8_RELAXED(_PyGen_GetGeneratorFromFrame(frame)->gi_frame_state) == FRAME_CLEARED);

// GH-99729: Clearing this frame can expose the stack (via finalizers). It's

// crucial that this frame has been unlinked, and is no longer visible:

assert(_PyThreadState_GET()->current_frame != frame);

PyFrameObject *f = FT_ATOMIC_LOAD_PTR_RELAXED(frame->frame_obj);

if (f != NULL) {

FT_ATOMIC_STORE_PTR_RELAXED(frame->frame_obj, NULL);

if (!_PyObject_IsUniquelyReferenced((PyObject *)f)) {

take_ownership(f, frame);

Py_DECREF(f);

return;

}

Py_DECREF(f);

}

_PyFrame_ClearLocals(frame);

PyStackRef_CLEAR(frame->f_funcobj);

}

/* Unstable API functions */

PyObject *

PyUnstable_InterpreterFrame_GetCode(struct _PyInterpreterFrame *frame)

{

return PyStackRef_AsPyObjectNew(frame->f_executable);

}

// NOTE: We allow racy accesses to the instruction pointer from other threads

// for sys._current_frames() and similar APIs.

int _Py_NO_SANITIZE_THREAD

PyUnstable_InterpreterFrame_GetLasti(struct _PyInterpreterFrame *frame)

{

return _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);

}

int _Py_NO_SANITIZE_THREAD

PyUnstable_InterpreterFrame_GetLine(_PyInterpreterFrame *frame)

{

int addr = _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);

return PyCode_Addr2Line(_PyFrame_GetCode(frame), addr);

}

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