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

* 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.

1 files changed, 2 insertions, 4 deletions

diff --git a/Python/_warnings.c b/Python/_warnings.c
index 9f68da2087..cf2110d31c 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -854,10 +854,8 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
         *lineno = 1;
     }
     else {
-        globals = _PyFrame_GetGlobals(f);
-        PyCodeObject *code = PyFrame_GetCode(f);
-        *filename = code->co_filename;
-        Py_DECREF(code);
+        globals = f->f_frame->f_globals;
+        *filename = f->f_frame->f_code->co_filename;
         Py_INCREF(*filename);
         *lineno = PyFrame_GetLineNumber(f);
         Py_DECREF(f);