cpython/Python/frame.c

136 lines
3.7 KiB
C

#include "Python.h"
#include "frameobject.h"
#include "pycore_frame.h"
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
int
_PyFrame_Traverse(InterpreterFrame *frame, visitproc visit, void *arg)
{
Py_VISIT(frame->frame_obj);
Py_VISIT(frame->f_globals);
Py_VISIT(frame->f_builtins);
Py_VISIT(frame->f_locals);
Py_VISIT(frame->f_code);
/* locals */
PyObject **locals = _PyFrame_GetLocalsArray(frame);
for (int i = 0; i < frame->nlocalsplus; i++) {
Py_VISIT(locals[i]);
}
/* stack */
for (int i = 0; i <frame->stackdepth; i++) {
Py_VISIT(frame->stack[i]);
}
return 0;
}
PyFrameObject *
_PyFrame_MakeAndSetFrameObject(InterpreterFrame *frame)
{
assert(frame->frame_obj == NULL);
PyObject *error_type, *error_value, *error_traceback;
PyErr_Fetch(&error_type, &error_value, &error_traceback);
PyFrameObject *f = _PyFrame_New_NoTrack(frame, 0);
if (f == NULL) {
Py_XDECREF(error_type);
Py_XDECREF(error_value);
Py_XDECREF(error_traceback);
}
else {
PyErr_Restore(error_type, error_value, error_traceback);
}
frame->frame_obj = f;
return f;
}
static InterpreterFrame *
copy_frame_to_heap(InterpreterFrame *frame)
{
Py_ssize_t size = ((char*)&frame->stack[frame->stackdepth]) - (char *)_PyFrame_GetLocalsArray(frame);
PyObject **copy = PyMem_Malloc(size);
if (copy == NULL) {
PyErr_NoMemory();
return NULL;
}
PyObject **locals = _PyFrame_GetLocalsArray(frame);
memcpy(copy, locals, size);
InterpreterFrame *res = (InterpreterFrame *)(copy + frame->nlocalsplus);
return res;
}
static inline void
clear_specials(InterpreterFrame *frame)
{
frame->generator = NULL;
Py_XDECREF(frame->frame_obj);
Py_XDECREF(frame->f_locals);
Py_DECREF(frame->f_globals);
Py_DECREF(frame->f_builtins);
Py_DECREF(frame->f_code);
}
static void
take_ownership(PyFrameObject *f, InterpreterFrame *frame)
{
assert(f->f_own_locals_memory == 0);
assert(frame->frame_obj == NULL);
f->f_own_locals_memory = 1;
f->f_frame = frame;
assert(f->f_back == NULL);
if (frame->previous != NULL) {
/* Link PyFrameObjects.f_back and remove link through InterpreterFrame.previous */
PyFrameObject *back = _PyFrame_GetFrameObject(frame->previous);
if (back == NULL) {
/* Memory error here. */
assert(PyErr_ExceptionMatches(PyExc_MemoryError));
/* Nothing we can do about it */
PyErr_Clear();
_PyErr_WriteUnraisableMsg("Out of memory lazily allocating frame->f_back", NULL);
}
else {
f->f_back = (PyFrameObject *)Py_NewRef(back);
}
frame->previous = NULL;
}
if (!_PyObject_GC_IS_TRACKED((PyObject *)f)) {
_PyObject_GC_TRACK((PyObject *)f);
}
}
int
_PyFrame_Clear(InterpreterFrame * frame, int take)
{
PyObject **localsarray = ((PyObject **)frame)-frame->nlocalsplus;
if (frame->frame_obj) {
PyFrameObject *f = frame->frame_obj;
frame->frame_obj = NULL;
if (Py_REFCNT(f) > 1) {
if (!take) {
frame = copy_frame_to_heap(frame);
if (frame == NULL) {
return -1;
}
}
take_ownership(f, frame);
Py_DECREF(f);
return 0;
}
Py_DECREF(f);
}
for (int i = 0; i < frame->nlocalsplus; i++) {
Py_XDECREF(localsarray[i]);
}
assert(frame->stackdepth >= 0);
for (int i = 0; i < frame->stackdepth; i++) {
Py_DECREF(frame->stack[i]);
}
clear_specials(frame);
if (take) {
PyMem_Free(_PyFrame_GetLocalsArray(frame));
}
return 0;
}