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bpo-44590: Lazily allocate frame objects (GH-27077)

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* Convert "specials" array to InterpreterFrame struct, adding f_lasti, f_state and other non-debug FrameObject fields to it.

* Refactor, calls pushing the call to the interpreter upward toward _PyEval_Vector.

* Compute f_back when on thread stack, only filling in value when frame object outlives stack invocation.

* Move ownership of InterpreterFrame in generator from frame object to generator object.

* Do not create frame objects for Python calls.

* Do not create frame objects for generators.
This commit is contained in:
Mark Shannon 2021-07-26 11:22:16 +01:00 • committed by GitHub
parent 0363a4014d
commit ae0a2b7562
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GPG key ID: 4AEE18F83AFDEB23
27 changed files with 1037 additions and 619 deletions
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16
Python/sysmodule.c
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@ -29,6 +29,7 @@ Data members:
#include "code.h"
#include "frameobject.h" // PyFrame_GetBack()
#include "pycore_frame.h"
#include "pydtrace.h"
#include "osdefs.h" // DELIM
#include "stdlib_module_names.h" // _Py_stdlib_module_names
@ -1814,25 +1815,22 @@ sys__getframe_impl(PyObject *module, int depth)
/*[clinic end generated code: output=d438776c04d59804 input=c1be8a6464b11ee5]*/
{
PyThreadState *tstate = _PyThreadState_GET();
PyFrameObject *f = PyThreadState_GetFrame(tstate);
InterpreterFrame *frame = tstate->frame;
if (_PySys_Audit(tstate, "sys._getframe", "O", f) < 0) {
Py_DECREF(f);
if (_PySys_Audit(tstate, "sys._getframe", NULL) < 0) {
return NULL;
}
while (depth > 0 && f != NULL) {
PyFrameObject *back = PyFrame_GetBack(f);
Py_DECREF(f);
f = back;
while (depth > 0 && frame != NULL) {
frame = frame->previous;
--depth;
}
if (f == NULL) {
if (frame == NULL) {
_PyErr_SetString(tstate, PyExc_ValueError,
"call stack is not deep enough");
return NULL;
}
return (PyObject*)f;
return _Py_XNewRef((PyObject *)_PyFrame_GetFrameObject(frame));
}
/*[clinic input]