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![Mark Shannon](/assets/img/avatar_default.png)
* Add table describing possible executable classes for out-of-process debuggers. * Remove shim code object creation code as it is no longer needed. * Make lltrace a bit more robust w.r.t. non-standard frames.
177 lines
5.9 KiB
C
177 lines
5.9 KiB
C
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#define _PY_INTERPRETER
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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(_PyInterpreterFrame *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_funcobj);
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Py_VISIT(_PyFrame_GetCode(frame));
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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(_PyInterpreterFrame *frame)
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{
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assert(frame->frame_obj == NULL);
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PyObject *exc = PyErr_GetRaisedException();
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PyFrameObject *f = _PyFrame_New_NoTrack(_PyFrame_GetCode(frame));
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if (f == NULL) {
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Py_XDECREF(exc);
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return NULL;
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}
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PyErr_SetRaisedException(exc);
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if (frame->frame_obj) {
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// GH-97002: How did we get into this horrible situation? Most likely,
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// allocating f triggered a GC collection, which ran some code that
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// *also* created the same frame... while we were in the middle of
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// creating it! See test_sneaky_frame_object in test_frame.py for a
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// concrete example.
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//
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// Regardless, just throw f away and use that frame instead, since it's
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// already been exposed to user code. It's actually a bit tricky to do
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// this, since we aren't backed by a real _PyInterpreterFrame anymore.
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// Just pretend that we have an owned, cleared frame so frame_dealloc
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// doesn't make the situation worse:
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f->f_frame = (_PyInterpreterFrame *)f->_f_frame_data;
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f->f_frame->owner = FRAME_CLEARED;
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f->f_frame->frame_obj = f;
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Py_DECREF(f);
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return frame->frame_obj;
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}
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assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT);
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assert(frame->owner != FRAME_CLEARED);
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f->f_frame = frame;
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frame->frame_obj = f;
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return f;
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}
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void
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_PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest)
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{
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assert(src->stacktop >= _PyFrame_GetCode(src)->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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// Don't leave a dangling pointer to the old frame when creating generators
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// and coroutines:
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dest->previous = NULL;
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}
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static void
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take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame)
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{
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assert(frame->owner != FRAME_OWNED_BY_CSTACK);
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assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT);
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assert(frame->owner != FRAME_CLEARED);
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Py_ssize_t size = ((char*)&frame->localsplus[frame->stacktop]) - (char *)frame;
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Py_INCREF(_PyFrame_GetCode(frame));
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memcpy((_PyInterpreterFrame *)f->_f_frame_data, frame, size);
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frame = (_PyInterpreterFrame *)f->_f_frame_data;
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f->f_frame = frame;
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frame->owner = FRAME_OWNED_BY_FRAME_OBJECT;
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if (_PyFrame_IsIncomplete(frame)) {
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// This may be a newly-created generator or coroutine frame. Since it's
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// dead anyways, just pretend that the first RESUME ran:
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PyCodeObject *code = _PyFrame_GetCode(frame);
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frame->prev_instr = _PyCode_CODE(code) + code->_co_firsttraceable;
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}
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assert(!_PyFrame_IsIncomplete(frame));
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assert(f->f_back == NULL);
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_PyInterpreterFrame *prev = _PyFrame_GetFirstComplete(frame->previous);
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frame->previous = NULL;
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if (prev) {
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assert(prev->owner != FRAME_OWNED_BY_CSTACK);
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/* Link PyFrameObjects.f_back and remove link through _PyInterpreterFrame.previous */
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PyFrameObject *back = _PyFrame_GetFrameObject(prev);
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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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}
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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_ClearExceptCode(_PyInterpreterFrame *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->owner != FRAME_OWNED_BY_GENERATOR ||
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_PyFrame_GetGenerator(frame)->gi_frame_state == FRAME_CLEARED);
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// GH-99729: Clearing this frame can expose the stack (via finalizers). It's
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// crucial that this frame has been unlinked, and is no longer visible:
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assert(_PyThreadState_GET()->cframe->current_frame != frame);
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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_funcobj);
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}
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/* Unstable API functions */
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PyObject *
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PyUnstable_InterpreterFrame_GetCode(struct _PyInterpreterFrame *frame)
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{
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PyObject *code = frame->f_executable;
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Py_INCREF(code);
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return code;
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}
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int
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PyUnstable_InterpreterFrame_GetLasti(struct _PyInterpreterFrame *frame)
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{
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return _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);
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}
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int
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PyUnstable_InterpreterFrame_GetLine(_PyInterpreterFrame *frame)
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{
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int addr = _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT);
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return PyCode_Addr2Line(_PyFrame_GetCode(frame), addr);
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}
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const PyTypeObject *const PyUnstable_ExecutableKinds[PY_EXECUTABLE_KINDS+1] = {
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[PY_EXECUTABLE_KIND_SKIP] = &_PyNone_Type,
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[PY_EXECUTABLE_KIND_PY_FUNCTION] = &PyCode_Type,
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[PY_EXECUTABLE_KIND_BUILTIN_FUNCTION] = &PyMethod_Type,
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[PY_EXECUTABLE_KIND_METHOD_DESCRIPTOR] = &PyMethodDescr_Type,
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[PY_EXECUTABLE_KINDS] = NULL,
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};
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