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Add Python ftrace contextmanager (#285)

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Gautham 2021-10-13 23:30:25 +05:30 • committed by GitHub
parent 425a57080d
commit d852640a1e
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3 changed files with 82 additions and 20 deletions
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97
third_party/python/Python/cosmomodule.c vendored
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@ -33,9 +33,11 @@
#include "third_party/python/Include/methodobject.h"
#include "third_party/python/Include/modsupport.h"
#include "third_party/python/Include/moduleobject.h"
#include "third_party/python/Include/object.h"
#include "third_party/python/Include/pyerrors.h"
#include "third_party/python/Include/pymacro.h"
#include "third_party/python/Include/pyport.h"
#include "third_party/python/Include/structmember.h"
#include "third_party/python/Include/yoink.h"
#include "third_party/xed/x86.h"
/* clang-format off */
@ -114,25 +116,6 @@ cosmo_getcpunode(PyObject *self, PyObject *noargs)
return PyLong_FromUnsignedLong(TSC_AUX_NODE(rdpid()));
}
PyDoc_STRVAR(ftrace_doc,
"ftrace($module)\n\
--\n\n\
Enables logging of C function calls to stderr, e.g.\n\
\n\
cosmo.ftrace()\n\
WeirdFunction()\n\
cosmo.exit1()\n\
\n\
Please be warned this prints massive amount of text. In order for it\n\
to work, the concomitant .com.dbg binary needs to be present.");
static PyObject *
cosmo_ftrace(PyObject *self, PyObject *noargs)
{
ftrace_install();
Py_RETURN_NONE;
}
PyDoc_STRVAR(crc32c_doc,
"crc32c($module, bytes, init=0)\n\
--\n\n\
@ -218,6 +201,78 @@ cosmo_exit1(PyObject *self, PyObject *args)
_Exit(1);
}
static bool ftrace_installed = 0;
typedef struct {
PyObject_HEAD
} TracerObject;
static int TracerObject_init(PyObject* self, PyObject *args, PyObject *kwargs)
{
if (!ftrace_installed) {
ftrace_install();
ftrace_installed = 1;
ftrace_enabled = 0;
}
return 0;
}
static PyObject* TracerObject_enter(PyObject *self, PyObject *Py_UNUSED(ignored))
{
ftrace_enabled = 1;
return self;
}
static PyObject* TracerObject_exit(PyObject *self, PyObject *args)
{
ftrace_enabled = 0;
return self;
}
static PyMethodDef TracerObject_methods[] = {
{"__enter__", (PyCFunction) TracerObject_enter, METH_NOARGS,
"enable ftrace to start logging"
},
{"__exit__", (PyCFunction) TracerObject_exit, METH_VARARGS,
"disable ftrace to stop logging"
},
{0}
};
static PyTypeObject TracerType = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "cosmo.Tracer",
.tp_doc = "wrapping ftrace with a context manager",
.tp_basicsize = sizeof(TracerObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_new = PyType_GenericNew,
.tp_init = (initproc) TracerObject_init,
.tp_methods = TracerObject_methods,
};
PyDoc_STRVAR(ftrace_doc,
"ftrace($module)\n\
--\n\n\
Enables logging of C function calls to stderr, e.g.\n\
\n\
with cosmo.ftrace() as F:\n\
WeirdFunction()\n\
\n\
Please be warned this prints massive amount of text. In order for it\n\
to work, the concomitant .com.dbg binary needs to be present.");
static PyObject *
cosmo_ftrace(PyObject *self, PyObject *noargs)
{
PyObject *tracer = PyType_GenericNew(&TracerType, NULL, NULL);
if (tracer == NULL) Py_RETURN_NONE;
TracerObject_init(tracer, NULL, NULL);
return tracer;
}
static PyMethodDef cosmo_methods[] = {
{"exit1", cosmo_exit1, METH_NOARGS, exit1_doc},
{"rdtsc", cosmo_rdtsc, METH_NOARGS, rdtsc_doc},
@ -266,11 +321,15 @@ PyMODINIT_FUNC
PyInit_cosmo(void)
{
PyObject *m;
if (PyType_Ready(&TracerType) < 0) return 0;
if (!(m = PyModule_Create(&cosmomodule))) return 0;
PyModule_AddStringConstant(m, "MODE", MODE);
PyModule_AddIntConstant(m, "IMAGE_BASE_VIRTUAL", IMAGE_BASE_VIRTUAL);
PyModule_AddStringConstant(m, "kernel", GetKernelName());
PyModule_AddIntConstant(m, "kStartTsc", kStartTsc);
Py_INCREF(&TracerType);
// PyModule_AddObject(m, "Tracer", (PyObject *) &TracerType);
return !PyErr_Occurred() ? m : 0;
}