cpython/Python/legacy_tracing.c

/* Support for legacy tracing on top of PEP 669 instrumentation
 * Provides callables to forward PEP 669 events to legacy events.
 */

#include "Python.h"
#include "pycore_audit.h"         // _PySys_Audit()
#include "pycore_ceval.h"         // export _PyEval_SetProfile()
#include "pycore_object.h"

#include "opcode.h"
#include <stddef.h>

_PyLegacyEventHandler;

#ifdef Py_GIL_DISABLED
#define LOCK_SETUP …
#define UNLOCK_SETUP …
#else
#define LOCK_SETUP() …
#define UNLOCK_SETUP() …
#endif
/* The Py_tracefunc function expects the following arguments:
 *   obj: the trace object (PyObject *)
 *   frame: the current frame (PyFrameObject *)
 *   kind: the kind of event, see PyTrace_XXX #defines (int)
 *   arg: The arg (a PyObject *)
 */

static PyObject *
call_profile_func(_PyLegacyEventHandler *self, PyObject *arg)
{ … }

static PyObject *
sys_profile_start(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_profile_throw(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_profile_return(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_profile_unwind(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_profile_call_or_return(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

int
_PyEval_SetOpcodeTrace(
    PyFrameObject *frame,
    bool enable
) { … }

static PyObject *
call_trace_func(_PyLegacyEventHandler *self, PyObject *arg)
{ … }

static PyObject *
sys_trace_exception_func(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_start(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_throw(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_unwind(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_return(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_yield(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
sys_trace_instruction_func(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

static PyObject *
trace_line(
    PyThreadState *tstate, _PyLegacyEventHandler *self,
    PyFrameObject *frame, int line
) { … }

static PyObject *
sys_trace_line_func(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

/* sys.settrace generates line events for all backward
 * edges, even if on the same line.
 * Handle that case here */
static PyObject *
sys_trace_jump_func(
    _PyLegacyEventHandler *self, PyObject *const *args,
    size_t nargsf, PyObject *kwnames
) { … }

PyTypeObject _PyLegacyEventHandler_Type = …;

static int
set_callbacks(int tool, vectorcallfunc vectorcall, int legacy_event, int event1, int event2)
{ … }

#ifndef NDEBUG
/* Ensure that tstate is valid: sanity check for PyEval_AcquireThread() and
   PyEval_RestoreThread(). Detect if tstate memory was freed. It can happen
   when a thread continues to run after Python finalization, especially
   daemon threads. */
static int
is_tstate_valid(PyThreadState *tstate)
{
    assert(!_PyMem_IsPtrFreed(tstate));
    assert(!_PyMem_IsPtrFreed(tstate->interp));
    return 1;
}
#endif

static Py_ssize_t
setup_profile(PyThreadState *tstate, Py_tracefunc func, PyObject *arg, PyObject **old_profileobj)
{ … }

int
_PyEval_SetProfile(PyThreadState *tstate, Py_tracefunc func, PyObject *arg)
{ … }

static Py_ssize_t
setup_tracing(PyThreadState *tstate, Py_tracefunc func, PyObject *arg, PyObject **old_traceobj)
{ … }

int
_PyEval_SetTrace(PyThreadState *tstate, Py_tracefunc func, PyObject *arg)
{ … }