mirror of https://github.com/python/cpython
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
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#include "Python.h"
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#include "frameobject.h"
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#include "pycore_code.h" // stats
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#include "pycore_frame.h"
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#include "pycore_object.h" // _PyObject_GC_UNTRACK()
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#include "opcode.h"
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int
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_PyFrame_Traverse(InterpreterFrame *frame, visitproc visit, void *arg)
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{
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Py_VISIT(frame->frame_obj);
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Py_VISIT(frame->f_locals);
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Py_VISIT(frame->f_func);
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Py_VISIT(frame->f_code);
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/* locals */
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PyObject **locals = _PyFrame_GetLocalsArray(frame);
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int i = 0;
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/* locals and stack */
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for (; i <frame->stacktop; i++) {
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Py_VISIT(locals[i]);
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}
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return 0;
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}
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PyFrameObject *
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_PyFrame_MakeAndSetFrameObject(InterpreterFrame *frame)
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{
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assert(frame->frame_obj == NULL);
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PyObject *error_type, *error_value, *error_traceback;
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PyErr_Fetch(&error_type, &error_value, &error_traceback);
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PyFrameObject *f = _PyFrame_New_NoTrack(frame->f_code);
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if (f == NULL) {
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Py_XDECREF(error_type);
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Py_XDECREF(error_value);
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Py_XDECREF(error_traceback);
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}
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else {
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f->f_owns_frame = 0;
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f->f_frame = frame;
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frame->frame_obj = f;
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PyErr_Restore(error_type, error_value, error_traceback);
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}
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return f;
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}
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void
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_PyFrame_Copy(InterpreterFrame *src, InterpreterFrame *dest)
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{
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assert(src->stacktop >= src->f_code->co_nlocalsplus);
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Py_ssize_t size = ((char*)&src->localsplus[src->stacktop]) - (char *)src;
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memcpy(dest, src, size);
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}
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static void
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take_ownership(PyFrameObject *f, InterpreterFrame *frame)
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{
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assert(f->f_owns_frame == 0);
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Py_ssize_t size = ((char*)&frame->localsplus[frame->stacktop]) - (char *)frame;
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memcpy((InterpreterFrame *)f->_f_frame_data, frame, size);
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frame = (InterpreterFrame *)f->_f_frame_data;
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f->f_owns_frame = 1;
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f->f_frame = frame;
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assert(f->f_back == NULL);
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if (frame->previous != NULL) {
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/* Link PyFrameObjects.f_back and remove link through InterpreterFrame.previous */
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PyFrameObject *back = _PyFrame_GetFrameObject(frame->previous);
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if (back == NULL) {
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/* Memory error here. */
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assert(PyErr_ExceptionMatches(PyExc_MemoryError));
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/* Nothing we can do about it */
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PyErr_Clear();
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}
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else {
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f->f_back = (PyFrameObject *)Py_NewRef(back);
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}
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frame->previous = NULL;
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}
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if (!_PyObject_GC_IS_TRACKED((PyObject *)f)) {
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_PyObject_GC_TRACK((PyObject *)f);
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}
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}
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void
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_PyFrame_Clear(InterpreterFrame *frame)
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{
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/* It is the responsibility of the owning generator/coroutine
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* to have cleared the enclosing generator, if any. */
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assert(!frame->is_generator);
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if (frame->frame_obj) {
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PyFrameObject *f = frame->frame_obj;
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frame->frame_obj = NULL;
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if (Py_REFCNT(f) > 1) {
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take_ownership(f, frame);
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Py_DECREF(f);
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return;
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}
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Py_DECREF(f);
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}
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assert(frame->stacktop >= 0);
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for (int i = 0; i < frame->stacktop; i++) {
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Py_XDECREF(frame->localsplus[i]);
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}
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Py_XDECREF(frame->frame_obj);
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Py_XDECREF(frame->f_locals);
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Py_DECREF(frame->f_func);
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Py_DECREF(frame->f_code);
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}
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/* Consumes reference to func */
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InterpreterFrame *
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_PyFrame_Push(PyThreadState *tstate, PyFunctionObject *func)
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{
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PyCodeObject *code = (PyCodeObject *)func->func_code;
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size_t size = code->co_nlocalsplus + code->co_stacksize + FRAME_SPECIALS_SIZE;
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CALL_STAT_INC(frames_pushed);
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InterpreterFrame *new_frame = _PyThreadState_BumpFramePointer(tstate, size);
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if (new_frame == NULL) {
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Py_DECREF(func);
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return NULL;
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}
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_PyFrame_InitializeSpecials(new_frame, func, NULL, code->co_nlocalsplus);
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return new_frame;
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}
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