mirror of
https://github.com/python/cpython.git
synced 2025-11-04 07:31:38 +00:00
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
|
|
#include "Python.h"
|
|
#include "frameobject.h"
|
|
#include "pycore_code.h" // stats
|
|
#include "pycore_frame.h"
|
|
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
|
|
#include "opcode.h"
|
|
|
|
int
|
|
_PyFrame_Traverse(InterpreterFrame *frame, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(frame->frame_obj);
|
|
Py_VISIT(frame->f_locals);
|
|
Py_VISIT(frame->f_func);
|
|
Py_VISIT(frame->f_code);
|
|
/* locals */
|
|
PyObject **locals = _PyFrame_GetLocalsArray(frame);
|
|
int i = 0;
|
|
/* locals and stack */
|
|
for (; i <frame->stacktop; i++) {
|
|
Py_VISIT(locals[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->f_code);
|
|
if (f == NULL) {
|
|
Py_XDECREF(error_type);
|
|
Py_XDECREF(error_value);
|
|
Py_XDECREF(error_traceback);
|
|
}
|
|
else {
|
|
f->f_owns_frame = 0;
|
|
f->f_frame = frame;
|
|
frame->frame_obj = f;
|
|
PyErr_Restore(error_type, error_value, error_traceback);
|
|
}
|
|
return f;
|
|
}
|
|
|
|
void
|
|
_PyFrame_Copy(InterpreterFrame *src, InterpreterFrame *dest)
|
|
{
|
|
assert(src->stacktop >= src->f_code->co_nlocalsplus);
|
|
Py_ssize_t size = ((char*)&src->localsplus[src->stacktop]) - (char *)src;
|
|
memcpy(dest, src, size);
|
|
}
|
|
|
|
|
|
static void
|
|
take_ownership(PyFrameObject *f, InterpreterFrame *frame)
|
|
{
|
|
assert(f->f_owns_frame == 0);
|
|
Py_ssize_t size = ((char*)&frame->localsplus[frame->stacktop]) - (char *)frame;
|
|
memcpy((InterpreterFrame *)f->_f_frame_data, frame, size);
|
|
frame = (InterpreterFrame *)f->_f_frame_data;
|
|
f->f_owns_frame = 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();
|
|
}
|
|
else {
|
|
f->f_back = (PyFrameObject *)Py_NewRef(back);
|
|
}
|
|
frame->previous = NULL;
|
|
}
|
|
if (!_PyObject_GC_IS_TRACKED((PyObject *)f)) {
|
|
_PyObject_GC_TRACK((PyObject *)f);
|
|
}
|
|
}
|
|
|
|
void
|
|
_PyFrame_Clear(InterpreterFrame *frame)
|
|
{
|
|
/* It is the responsibility of the owning generator/coroutine
|
|
* to have cleared the enclosing generator, if any. */
|
|
assert(!frame->is_generator);
|
|
if (frame->frame_obj) {
|
|
PyFrameObject *f = frame->frame_obj;
|
|
frame->frame_obj = NULL;
|
|
if (Py_REFCNT(f) > 1) {
|
|
take_ownership(f, frame);
|
|
Py_DECREF(f);
|
|
return;
|
|
}
|
|
Py_DECREF(f);
|
|
}
|
|
assert(frame->stacktop >= 0);
|
|
for (int i = 0; i < frame->stacktop; i++) {
|
|
Py_XDECREF(frame->localsplus[i]);
|
|
}
|
|
Py_XDECREF(frame->frame_obj);
|
|
Py_XDECREF(frame->f_locals);
|
|
Py_DECREF(frame->f_func);
|
|
Py_DECREF(frame->f_code);
|
|
}
|
|
|
|
/* Consumes reference to func */
|
|
InterpreterFrame *
|
|
_PyFrame_Push(PyThreadState *tstate, PyFunctionObject *func)
|
|
{
|
|
PyCodeObject *code = (PyCodeObject *)func->func_code;
|
|
size_t size = code->co_nlocalsplus + code->co_stacksize + FRAME_SPECIALS_SIZE;
|
|
CALL_STAT_INC(frames_pushed);
|
|
InterpreterFrame *new_frame = _PyThreadState_BumpFramePointer(tstate, size);
|
|
if (new_frame == NULL) {
|
|
Py_DECREF(func);
|
|
return NULL;
|
|
}
|
|
_PyFrame_InitializeSpecials(new_frame, func, NULL, code->co_nlocalsplus);
|
|
return new_frame;
|
|
}
|