mirror of
https://github.com/python/cpython
synced 2024-09-15 23:57:10 +00:00
ea2c001650
This is the implementation of PEP683 Motivation: The PR introduces the ability to immortalize instances in CPython which bypasses reference counting. Tagging objects as immortal allows up to skip certain operations when we know that the object will be around for the entire execution of the runtime. Note that this by itself will bring a performance regression to the runtime due to the extra reference count checks. However, this brings the ability of having truly immutable objects that are useful in other contexts such as immutable data sharing between sub-interpreters.
529 lines
17 KiB
C
529 lines
17 KiB
C
/* Support for legacy tracing on top of PEP 669 instrumentation
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* Provides callables to forward PEP 669 events to legacy events.
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*/
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#include <stddef.h>
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#include "Python.h"
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#include "pycore_ceval.h"
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#include "pycore_object.h"
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#include "pycore_sysmodule.h"
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typedef struct _PyLegacyEventHandler {
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PyObject_HEAD
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vectorcallfunc vectorcall;
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int event;
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} _PyLegacyEventHandler;
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/* The Py_tracefunc function expects the following arguments:
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* obj: the trace object (PyObject *)
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* frame: the current frame (PyFrameObject *)
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* kind: the kind of event, see PyTrace_XXX #defines (int)
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* arg: The arg (a PyObject *)
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*/
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static PyObject *
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call_profile_func(_PyLegacyEventHandler *self, PyObject *arg)
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{
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->c_profilefunc == NULL) {
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Py_RETURN_NONE;
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}
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PyFrameObject *frame = PyEval_GetFrame();
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if (frame == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"Missing frame when calling profile function.");
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return NULL;
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}
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Py_INCREF(frame);
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int err = tstate->c_profilefunc(tstate->c_profileobj, frame, self->event, arg);
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Py_DECREF(frame);
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if (err) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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sys_profile_func2(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 2);
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return call_profile_func(self, Py_None);
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}
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static PyObject *
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sys_profile_func3(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 3);
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return call_profile_func(self, args[2]);
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}
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static PyObject *
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sys_profile_call_or_return(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 4);
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PyObject *callable = args[2];
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if (PyCFunction_Check(callable)) {
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return call_profile_func(self, callable);
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}
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if (Py_TYPE(callable) == &PyMethodDescr_Type) {
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PyObject *self_arg = args[3];
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/* For backwards compatibility need to
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* convert to builtin method */
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/* If no arg, skip */
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if (self_arg == &_PyInstrumentation_MISSING) {
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Py_RETURN_NONE;
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}
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PyObject *meth = Py_TYPE(callable)->tp_descr_get(
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callable, self_arg, (PyObject*)Py_TYPE(self_arg));
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if (meth == NULL) {
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return NULL;
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}
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PyObject *res = call_profile_func(self, meth);
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Py_DECREF(meth);
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return res;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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call_trace_func(_PyLegacyEventHandler *self, PyObject *arg)
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{
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->c_tracefunc == NULL) {
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Py_RETURN_NONE;
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}
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PyFrameObject *frame = PyEval_GetFrame();
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if (frame == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"Missing frame when calling trace function.");
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return NULL;
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}
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Py_INCREF(frame);
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int err = tstate->c_tracefunc(tstate->c_traceobj, frame, self->event, arg);
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Py_DECREF(frame);
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if (err) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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sys_trace_exception_func(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 3);
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PyObject *exc = args[2];
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assert(PyExceptionInstance_Check(exc));
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PyObject *type = (PyObject *)Py_TYPE(exc);
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PyObject *tb = PyException_GetTraceback(exc);
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if (tb == NULL) {
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tb = Py_NewRef(Py_None);
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}
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PyObject *tuple = PyTuple_Pack(3, type, exc, tb);
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Py_DECREF(tb);
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if (tuple == NULL) {
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return NULL;
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}
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PyObject *res = call_trace_func(self, tuple);
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Py_DECREF(tuple);
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return res;
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}
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static PyObject *
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sys_trace_func2(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 2);
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return call_trace_func(self, Py_None);
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}
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static PyObject *
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sys_trace_return(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(!PyErr_Occurred());
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 3);
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assert(PyCode_Check(args[0]));
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PyObject *val = args[2];
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PyObject *res = call_trace_func(self, val);
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return res;
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}
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static PyObject *
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sys_trace_yield(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 3);
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return call_trace_func(self, args[2]);
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}
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static PyObject *
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sys_trace_instruction_func(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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assert(PyVectorcall_NARGS(nargsf) == 2);
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PyFrameObject *frame = PyEval_GetFrame();
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if (frame == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"Missing frame when calling trace function.");
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return NULL;
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}
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if (!frame->f_trace_opcodes) {
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Py_RETURN_NONE;
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}
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Py_INCREF(frame);
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PyThreadState *tstate = _PyThreadState_GET();
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int err = tstate->c_tracefunc(tstate->c_traceobj, frame, self->event, Py_None);
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frame->f_lineno = 0;
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Py_DECREF(frame);
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if (err) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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trace_line(
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PyThreadState *tstate, _PyLegacyEventHandler *self,
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PyFrameObject *frame, int line
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) {
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if (!frame->f_trace_lines) {
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Py_RETURN_NONE;
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}
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if (line < 0) {
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Py_RETURN_NONE;
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}
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frame ->f_last_traced_line = line;
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Py_INCREF(frame);
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frame->f_lineno = line;
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int err = tstate->c_tracefunc(tstate->c_traceobj, frame, self->event, Py_None);
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frame->f_lineno = 0;
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Py_DECREF(frame);
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if (err) {
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return NULL;
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}
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Py_RETURN_NONE;
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}
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static PyObject *
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sys_trace_line_func(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->c_tracefunc == NULL) {
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Py_RETURN_NONE;
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}
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assert(PyVectorcall_NARGS(nargsf) == 2);
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int line = _PyLong_AsInt(args[1]);
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assert(line >= 0);
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PyFrameObject *frame = PyEval_GetFrame();
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if (frame == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"Missing frame when calling trace function.");
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return NULL;
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}
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assert(args[0] == (PyObject *)frame->f_frame->f_code);
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if (frame ->f_last_traced_line == line) {
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/* Already traced this line */
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Py_RETURN_NONE;
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}
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return trace_line(tstate, self, frame, line);
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}
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static PyObject *
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sys_trace_jump_func(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->c_tracefunc == NULL) {
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Py_RETURN_NONE;
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}
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assert(PyVectorcall_NARGS(nargsf) == 3);
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int from = _PyLong_AsInt(args[1])/sizeof(_Py_CODEUNIT);
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assert(from >= 0);
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int to = _PyLong_AsInt(args[2])/sizeof(_Py_CODEUNIT);
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assert(to >= 0);
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PyFrameObject *frame = PyEval_GetFrame();
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if (frame == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"Missing frame when calling trace function.");
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return NULL;
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}
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if (!frame->f_trace_lines) {
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Py_RETURN_NONE;
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}
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PyCodeObject *code = (PyCodeObject *)args[0];
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assert(PyCode_Check(code));
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assert(code == frame->f_frame->f_code);
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/* We can call _Py_Instrumentation_GetLine because we always set
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* line events for tracing */
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int to_line = _Py_Instrumentation_GetLine(code, to);
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/* Backward jump: Always generate event
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* Forward jump: Only generate event if jumping to different line. */
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if (to > from && frame->f_last_traced_line == to_line) {
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/* Already traced this line */
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Py_RETURN_NONE;
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}
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return trace_line(tstate, self, frame, to_line);
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}
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/* We don't care about the exception here,
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* we just treat it as a possible new line
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*/
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static PyObject *
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sys_trace_exception_handled(
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_PyLegacyEventHandler *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames
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) {
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assert(kwnames == NULL);
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PyThreadState *tstate = _PyThreadState_GET();
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if (tstate->c_tracefunc == NULL) {
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Py_RETURN_NONE;
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}
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assert(PyVectorcall_NARGS(nargsf) == 3);
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PyFrameObject *frame = PyEval_GetFrame();
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PyCodeObject *code = (PyCodeObject *)args[0];
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assert(PyCode_Check(code));
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assert(code == frame->f_frame->f_code);
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assert(PyLong_Check(args[1]));
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int offset = _PyLong_AsInt(args[1])/sizeof(_Py_CODEUNIT);
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/* We can call _Py_Instrumentation_GetLine because we always set
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* line events for tracing */
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int line = _Py_Instrumentation_GetLine(code, offset);
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if (frame->f_last_traced_line == line) {
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/* Already traced this line */
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Py_RETURN_NONE;
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}
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return trace_line(tstate, self, frame, line);
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}
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PyTypeObject _PyLegacyEventHandler_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"sys.legacy_event_handler",
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sizeof(_PyLegacyEventHandler),
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.tp_dealloc = (destructor)PyObject_Free,
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.tp_vectorcall_offset = offsetof(_PyLegacyEventHandler, vectorcall),
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.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE |
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Py_TPFLAGS_HAVE_VECTORCALL | Py_TPFLAGS_DISALLOW_INSTANTIATION,
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.tp_call = PyVectorcall_Call,
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};
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static int
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set_callbacks(int tool, vectorcallfunc vectorcall, int legacy_event, int event1, int event2)
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{
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_PyLegacyEventHandler *callback =
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PyObject_NEW(_PyLegacyEventHandler, &_PyLegacyEventHandler_Type);
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if (callback == NULL) {
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return -1;
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}
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callback->vectorcall = vectorcall;
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callback->event = legacy_event;
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Py_XDECREF(_PyMonitoring_RegisterCallback(tool, event1, (PyObject *)callback));
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if (event2 >= 0) {
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Py_XDECREF(_PyMonitoring_RegisterCallback(tool, event2, (PyObject *)callback));
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}
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Py_DECREF(callback);
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return 0;
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}
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#ifndef NDEBUG
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/* Ensure that tstate is valid: sanity check for PyEval_AcquireThread() and
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PyEval_RestoreThread(). Detect if tstate memory was freed. It can happen
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when a thread continues to run after Python finalization, especially
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daemon threads. */
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static int
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is_tstate_valid(PyThreadState *tstate)
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{
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assert(!_PyMem_IsPtrFreed(tstate));
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assert(!_PyMem_IsPtrFreed(tstate->interp));
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return 1;
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}
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#endif
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int
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_PyEval_SetProfile(PyThreadState *tstate, Py_tracefunc func, PyObject *arg)
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{
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assert(is_tstate_valid(tstate));
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/* The caller must hold the GIL */
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assert(PyGILState_Check());
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/* Call _PySys_Audit() in the context of the current thread state,
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even if tstate is not the current thread state. */
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PyThreadState *current_tstate = _PyThreadState_GET();
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if (_PySys_Audit(current_tstate, "sys.setprofile", NULL) < 0) {
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return -1;
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}
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/* Setup PEP 669 monitoring callbacks and events. */
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if (!tstate->interp->sys_profile_initialized) {
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tstate->interp->sys_profile_initialized = true;
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_func2, PyTrace_CALL,
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PY_MONITORING_EVENT_PY_START, PY_MONITORING_EVENT_PY_RESUME)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_func3, PyTrace_RETURN,
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PY_MONITORING_EVENT_PY_RETURN, PY_MONITORING_EVENT_PY_YIELD)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_func2, PyTrace_RETURN,
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PY_MONITORING_EVENT_PY_UNWIND, -1)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_call_or_return, PyTrace_C_CALL,
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PY_MONITORING_EVENT_CALL, -1)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_call_or_return, PyTrace_C_RETURN,
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PY_MONITORING_EVENT_C_RETURN, -1)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_PROFILE_ID,
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(vectorcallfunc)sys_profile_call_or_return, PyTrace_C_EXCEPTION,
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PY_MONITORING_EVENT_C_RAISE, -1)) {
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return -1;
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}
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}
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int delta = (func != NULL) - (tstate->c_profilefunc != NULL);
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tstate->c_profilefunc = func;
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PyObject *old_profileobj = tstate->c_profileobj;
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tstate->c_profileobj = Py_XNewRef(arg);
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Py_XDECREF(old_profileobj);
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tstate->interp->sys_profiling_threads += delta;
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assert(tstate->interp->sys_profiling_threads >= 0);
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uint32_t events = 0;
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if (tstate->interp->sys_profiling_threads) {
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events =
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(1 << PY_MONITORING_EVENT_PY_START) | (1 << PY_MONITORING_EVENT_PY_RESUME) |
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(1 << PY_MONITORING_EVENT_PY_RETURN) | (1 << PY_MONITORING_EVENT_PY_YIELD) |
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(1 << PY_MONITORING_EVENT_CALL) | (1 << PY_MONITORING_EVENT_PY_UNWIND);
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}
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return _PyMonitoring_SetEvents(PY_MONITORING_SYS_PROFILE_ID, events);
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}
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int
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_PyEval_SetTrace(PyThreadState *tstate, Py_tracefunc func, PyObject *arg)
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{
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assert(is_tstate_valid(tstate));
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/* The caller must hold the GIL */
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assert(PyGILState_Check());
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/* Call _PySys_Audit() in the context of the current thread state,
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even if tstate is not the current thread state. */
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PyThreadState *current_tstate = _PyThreadState_GET();
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if (_PySys_Audit(current_tstate, "sys.settrace", NULL) < 0) {
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return -1;
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}
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assert(tstate->interp->sys_tracing_threads >= 0);
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/* Setup PEP 669 monitoring callbacks and events. */
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if (!tstate->interp->sys_trace_initialized) {
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tstate->interp->sys_trace_initialized = true;
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if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
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(vectorcallfunc)sys_trace_func2, PyTrace_CALL,
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PY_MONITORING_EVENT_PY_START, PY_MONITORING_EVENT_PY_RESUME)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
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(vectorcallfunc)sys_trace_func2, PyTrace_CALL,
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PY_MONITORING_EVENT_PY_THROW, -1)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
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(vectorcallfunc)sys_trace_return, PyTrace_RETURN,
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PY_MONITORING_EVENT_PY_RETURN, -1)) {
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return -1;
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}
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if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
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(vectorcallfunc)sys_trace_yield, PyTrace_RETURN,
|
|
PY_MONITORING_EVENT_PY_YIELD, -1)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_exception_func, PyTrace_EXCEPTION,
|
|
PY_MONITORING_EVENT_RAISE, PY_MONITORING_EVENT_STOP_ITERATION)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_line_func, PyTrace_LINE,
|
|
PY_MONITORING_EVENT_LINE, -1)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_func2, PyTrace_RETURN,
|
|
PY_MONITORING_EVENT_PY_UNWIND, -1)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_jump_func, PyTrace_LINE,
|
|
PY_MONITORING_EVENT_JUMP, PY_MONITORING_EVENT_BRANCH)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_instruction_func, PyTrace_OPCODE,
|
|
PY_MONITORING_EVENT_INSTRUCTION, -1)) {
|
|
return -1;
|
|
}
|
|
if (set_callbacks(PY_MONITORING_SYS_TRACE_ID,
|
|
(vectorcallfunc)sys_trace_exception_handled, PyTrace_LINE,
|
|
PY_MONITORING_EVENT_EXCEPTION_HANDLED, -1)) {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
int delta = (func != NULL) - (tstate->c_tracefunc != NULL);
|
|
tstate->c_tracefunc = func;
|
|
PyObject *old_traceobj = tstate->c_traceobj;
|
|
tstate->c_traceobj = Py_XNewRef(arg);
|
|
Py_XDECREF(old_traceobj);
|
|
tstate->interp->sys_tracing_threads += delta;
|
|
assert(tstate->interp->sys_tracing_threads >= 0);
|
|
|
|
uint32_t events = 0;
|
|
if (tstate->interp->sys_tracing_threads) {
|
|
events =
|
|
(1 << PY_MONITORING_EVENT_PY_START) | (1 << PY_MONITORING_EVENT_PY_RESUME) |
|
|
(1 << PY_MONITORING_EVENT_PY_RETURN) | (1 << PY_MONITORING_EVENT_PY_YIELD) |
|
|
(1 << PY_MONITORING_EVENT_RAISE) | (1 << PY_MONITORING_EVENT_LINE) |
|
|
(1 << PY_MONITORING_EVENT_JUMP) | (1 << PY_MONITORING_EVENT_BRANCH) |
|
|
(1 << PY_MONITORING_EVENT_PY_UNWIND) | (1 << PY_MONITORING_EVENT_PY_THROW) |
|
|
(1 << PY_MONITORING_EVENT_STOP_ITERATION) |
|
|
(1 << PY_MONITORING_EVENT_EXCEPTION_HANDLED);
|
|
if (tstate->interp->f_opcode_trace_set) {
|
|
events |= (1 << PY_MONITORING_EVENT_INSTRUCTION);
|
|
}
|
|
}
|
|
return _PyMonitoring_SetEvents(PY_MONITORING_SYS_TRACE_ID, events);
|
|
}
|