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509 lines (434 loc) · 13 KB
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/**
* This file is the CPython module _vmprof. It does not share code
* with PyPy. PyPy's _vmprof module is included in the main repo.
*/
#define _GNU_SOURCE 1
#include <Python.h>
#include <frameobject.h>
#include <signal.h>
#include "_vmprof.h"
#include "vmprof_common.h"
static destructor Original_code_dealloc = 0;
static PyObject* (*_default_eval_loop)(PyFrameObject *, int) = 0;
#if VMPROF_UNIX
#include "trampoline.h"
#include "machine.h"
#include "symboltable.h"
#include "vmprof_unix.h"
#else
#include "vmprof_win.h"
#endif
#include "vmp_stack.h"
#ifdef VMPROF_UNIX
#ifdef __clang__
__attribute__((optnone))
#elif defined(__GNUC__)
__attribute__((optimize("O1")))
#endif
PY_EVAL_RETURN_T * vmprof_eval(PY_STACK_FRAME_T *f, int throwflag)
{
#ifdef X86_64
register PY_STACK_FRAME_T * callee_saved asm("rbx");
#elif defined(X86_32)
register PY_STACK_FRAME_T * callee_saved asm("edi");
#elif defined(__arm__)
register PY_STACK_FRAME_T * callee_saved asm("r4");
#elif defined(__aarch64__)
register PY_STACK_FRAME_T * callee_saved asm("x19");
#elif defined(__powerpc64__)
register PY_STACK_FRAME_T * callee_saved asm("r3");
#else
# error "platform not supported"
#endif
asm volatile(
#ifdef X86_64
"movq %1, %0\t\n"
#elif defined(X86_32)
"mov %1, %0\t\n"
#elif defined(__arm__) || defined(__aarch64__)
"mov %1, %0\t\n"
#elif defined(__powerpc64__)
"addi %1, %0, 0\t\n"
#else
# error "platform not supported"
#endif
: "=r" (callee_saved)
: "r" (f) );
return _default_eval_loop(f, throwflag);
}
#endif
static int emit_code_object(PyCodeObject *co)
{
char buf[MAX_FUNC_NAME + 1];
const char *co_name, *co_filename;
int co_firstlineno;
int sz;
#if PY_MAJOR_VERSION >= 3
co_name = PyUnicode_AsUTF8(co->co_name);
if (co_name == NULL)
return -1;
co_filename = PyUnicode_AsUTF8(co->co_filename);
if (co_filename == NULL)
return -1;
#else
co_name = PyString_AS_STRING(co->co_name);
co_filename = PyString_AS_STRING(co->co_filename);
#endif
co_firstlineno = co->co_firstlineno;
sz = snprintf(buf, MAX_FUNC_NAME / 2, "py:%s", co_name);
if (sz < 0) sz = 0;
if (sz > MAX_FUNC_NAME / 2) sz = MAX_FUNC_NAME / 2;
snprintf(buf + sz, MAX_FUNC_NAME / 2, ":%d:%s", co_firstlineno,
co_filename);
return vmprof_register_virtual_function(buf, CODE_ADDR_TO_UID(co), 500000);
}
static int _look_for_code_object(PyObject *o, void * param)
{
Py_ssize_t i;
PyObject * all_codes, * seen_codes;
all_codes = (PyObject*)((void**)param)[0];
seen_codes = (PyObject*)((void**)param)[1];
if (PyCode_Check(o) && !PySet_Contains(all_codes, o)) {
PyCodeObject *co = (PyCodeObject *)o;
PyObject * id = PyLong_FromVoidPtr((void*)CODE_ADDR_TO_UID(co));
if (PySet_Contains(seen_codes, id)) {
// only emit if the code id has been seen!
if (emit_code_object(co) < 0)
return -1;
if (PySet_Add(all_codes, o) < 0)
return -1;
}
/* as a special case, recursively look for and add code
objects found in the co_consts. The problem is that code
objects are not created as GC-aware in CPython, so we need
to hack like this to hope to find most of them.
*/
i = PyTuple_Size(co->co_consts);
while (i > 0) {
--i;
if (_look_for_code_object(PyTuple_GET_ITEM(co->co_consts, i),
param) < 0)
return -1;
}
}
return 0;
}
static
void emit_all_code_objects(PyObject * seen_code_ids)
{
PyObject *gc_module = NULL, *lst = NULL, *all_codes = NULL;
Py_ssize_t i, size;
void * param[2];
gc_module = PyImport_ImportModuleNoBlock("gc");
if (gc_module == NULL)
goto error;
// lst contains all objects that are known by the gc
lst = PyObject_CallMethod(gc_module, "get_objects", "");
if (lst == NULL || !PyList_Check(lst))
goto error;
// the set only includes the code objects found in the profile
all_codes = PySet_New(NULL);
if (all_codes == NULL)
goto error;
param[0] = all_codes;
param[1] = seen_code_ids;
size = PyList_GET_SIZE(lst);
for (i = 0; i < size; i++) {
PyObject *o = PyList_GET_ITEM(lst, i);
if (o->ob_type->tp_traverse &&
o->ob_type->tp_traverse(o, _look_for_code_object, (void*)param)
< 0)
goto error;
}
error:
Py_XDECREF(all_codes);
Py_XDECREF(lst);
Py_XDECREF(gc_module);
}
static void cpyprof_code_dealloc(PyObject *co)
{
if (vmprof_is_enabled()) {
emit_code_object((PyCodeObject *)co);
/* xxx error return values are ignored */
}
Original_code_dealloc(co);
}
static PyObject *enable_vmprof(PyObject* self, PyObject *args)
{
int fd;
int memory = 0;
int lines = 0;
int native = 0;
int real_time = 0;
double interval;
char *p_error;
if (!PyArg_ParseTuple(args, "id|iiii", &fd, &interval, &memory, &lines, &native, &real_time)) {
return NULL;
}
if (write(fd, NULL, 0) != 0) {
PyErr_SetString(PyExc_ValueError, "file descriptor must be writeable");
return NULL;
}
if ((read(fd, NULL, 0) != 0) && (native != 0)) {
PyErr_SetString(PyExc_ValueError, "file descriptor must be readable");
return NULL;
}
if (vmprof_is_enabled()) {
PyErr_SetString(PyExc_ValueError, "vmprof is already enabled");
return NULL;
}
#ifndef VMPROF_UNIX
if (real_time) {
PyErr_SetString(PyExc_ValueError, "real time profiling is only supported on Linux and MacOS");
return NULL;
}
#endif
vmp_profile_lines(lines);
if (!Original_code_dealloc) {
Original_code_dealloc = PyCode_Type.tp_dealloc;
PyCode_Type.tp_dealloc = &cpyprof_code_dealloc;
}
p_error = vmprof_init(fd, interval, memory, lines, "cpython", native, real_time);
if (p_error) {
PyErr_SetString(PyExc_ValueError, p_error);
return NULL;
}
if (vmprof_enable(memory, native, real_time) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
vmprof_set_enabled(1);
Py_RETURN_NONE;
}
static PyObject * vmp_is_enabled(PyObject *module, PyObject *noargs) {
if (vmprof_is_enabled()) {
Py_RETURN_TRUE;
}
Py_RETURN_FALSE;
}
static PyObject *
disable_vmprof(PyObject *module, PyObject *noargs)
{
if (vmprof_disable() < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
vmprof_set_enabled(0);
if (PyErr_Occurred())
return NULL;
Py_RETURN_NONE;
}
static PyObject *
write_all_code_objects(PyObject *module, PyObject * seen_code_ids)
{
// assumptions: signals must be disabled (see stop_sampling)
emit_all_code_objects(seen_code_ids);
if (PyErr_Occurred())
return NULL;
Py_RETURN_NONE;
}
static PyObject *
sample_stack_now(PyObject *module, PyObject * args)
{
PyThreadState * tstate = NULL;
PyObject * list = NULL;
int i;
int entry_count;
void ** m;
void * routine_ip;
long skip = 0;
// stop any signal to occur
vmprof_ignore_signals(1);
list = PyList_New(0);
if (list == NULL) {
goto error;
}
if (!PyArg_ParseTuple(args, "l", &skip)) {
goto error;
}
tstate = PyGILState_GetThisThreadState();
m = (void**)malloc(SINGLE_BUF_SIZE);
if (m == NULL) {
PyErr_SetString(PyExc_MemoryError, "could not allocate buffer for stack trace");
vmprof_ignore_signals(0);
return NULL;
}
entry_count = vmp_walk_and_record_stack(tstate->frame, m, SINGLE_BUF_SIZE/sizeof(void*)-1, (int)skip, 0);
for (i = 0; i < entry_count; i++) {
routine_ip = m[i];
PyList_Append(list, PyLong_NEW((Py_ssize_t)routine_ip));
}
free(m);
vmprof_ignore_signals(0);
Py_INCREF(list);
return list;
error:
vmprof_ignore_signals(0);
Py_DECREF(list);
Py_RETURN_NONE;
}
#ifdef VMP_SUPPORTS_NATIVE_PROFILING
static PyObject *
resolve_addr(PyObject *module, PyObject *args) {
long long addr;
PyObject * o_name = NULL;
PyObject * o_lineno = NULL;
PyObject * o_srcfile = NULL;
char name[128];
int lineno = 0;
char srcfile[256];
if (!PyArg_ParseTuple(args, "L", &addr)) {
return NULL;
}
name[0] = '\x00';
srcfile[0] = '-';
srcfile[1] = '\x00';
if (vmp_resolve_addr((void*)addr, name, 128, &lineno, srcfile, 256) != 0) {
goto error;
}
o_name = PyStr_NEW(name);
if (o_name == NULL) goto error;
o_lineno = PyLong_NEW(lineno);
if (o_lineno == NULL) goto error;
o_srcfile = PyStr_NEW(srcfile);
if (o_srcfile == NULL) goto error;
//
return PyTuple_Pack(3, o_name, o_lineno, o_srcfile);
error:
Py_XDECREF(o_name);
Py_XDECREF(o_lineno);
Py_XDECREF(o_srcfile);
Py_RETURN_NONE;
}
#endif
static PyObject *
stop_sampling(PyObject *module, PyObject *noargs)
{
vmprof_ignore_signals(1);
return PyLong_NEW(vmp_profile_fileno());
}
static PyObject *
start_sampling(PyObject *module, PyObject *noargs)
{
vmprof_ignore_signals(0);
Py_RETURN_NONE;
}
#ifdef VMPROF_UNIX
static PyObject * vmp_get_profile_path(PyObject *module, PyObject *noargs) {
PyObject * o;
if (vmprof_is_enabled()) {
char buffer[4096];
buffer[0] = 0;
ssize_t buffer_len = vmp_fd_to_path(vmp_profile_fileno(), buffer, 4096);
if (buffer_len == -1) {
PyErr_Format(PyExc_NotImplementedError, "not implemented platform %s", vmp_machine_os_name());
return NULL;
}
return PyStr_n_NEW(buffer, buffer_len);
}
Py_RETURN_NONE;
}
#endif
#ifdef VMPROF_UNIX
static PyObject *
insert_real_time_thread(PyObject *module, PyObject * args) {
ssize_t thread_count;
unsigned long thread_id = 0;
pthread_t th = pthread_self();
if (!PyArg_ParseTuple(args, "|k", &thread_id)) {
return NULL;
}
if (thread_id) {
#if SIZEOF_LONG <= SIZEOF_PTHREAD_T
th = (pthread_t) thread_id;
#else
th = (pthread_t) *(unsigned long *) &thread_id;
#endif
}
if (!vmprof_is_enabled()) {
PyErr_SetString(PyExc_ValueError, "vmprof is not enabled");
return NULL;
}
if (vmprof_get_signal_type() != SIGALRM) {
PyErr_SetString(PyExc_ValueError, "vmprof is not in real time mode");
return NULL;
}
vmprof_aquire_lock();
thread_count = insert_thread(th, -1);
vmprof_release_lock();
return PyLong_FromSsize_t(thread_count);
}
static PyObject *
remove_real_time_thread(PyObject *module, PyObject * args) {
ssize_t thread_count;
unsigned long thread_id = 0;
pthread_t th = pthread_self();
if (!PyArg_ParseTuple(args, "|k", &thread_id)) {
return NULL;
}
if (thread_id) {
#if SIZEOF_LONG <= SIZEOF_PTHREAD_T
th = (pthread_t) thread_id;
#else
th = (pthread_t) *(unsigned long *) &thread_id;
#endif
}
if (!vmprof_is_enabled()) {
PyErr_SetString(PyExc_ValueError, "vmprof is not enabled");
return NULL;
}
if (vmprof_get_signal_type() != SIGALRM) {
PyErr_SetString(PyExc_ValueError, "vmprof is not in real time mode");
return NULL;
}
vmprof_aquire_lock();
thread_count = remove_thread(th, -1);
vmprof_release_lock();
return PyLong_FromSsize_t(thread_count);
}
#endif
static PyMethodDef VMProfMethods[] = {
{"enable", enable_vmprof, METH_VARARGS, "Enable profiling."},
{"disable", disable_vmprof, METH_NOARGS, "Disable profiling."},
{"write_all_code_objects", write_all_code_objects, METH_O,
"Write eagerly all the IDs of code objects"},
{"sample_stack_now", sample_stack_now, METH_VARARGS,
"Sample the stack now"},
{"is_enabled", vmp_is_enabled, METH_NOARGS,
"Indicates if vmprof is currently sampling."},
{"stop_sampling", stop_sampling, METH_NOARGS,
"Blocks signals to occur and returns the file descriptor"},
{"start_sampling", start_sampling, METH_NOARGS,
"Unblocks vmprof signals. After compeltion vmprof will sample again"},
#ifdef VMP_SUPPORTS_NATIVE_PROFILING
{"resolve_addr", resolve_addr, METH_VARARGS,
"Returns the name of the given address"},
#endif
#ifdef VMPROF_UNIX
{"get_profile_path", vmp_get_profile_path, METH_NOARGS,
"Profile path the profiler logs to."},
{"insert_real_time_thread", insert_real_time_thread, METH_VARARGS,
"Insert a thread into the real time profiling list."},
{"remove_real_time_thread", remove_real_time_thread, METH_VARARGS,
"Remove a thread from the real time profiling list."},
#endif
{NULL, NULL, 0, NULL} /* Sentinel */
};
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef VmprofModule = {
PyModuleDef_HEAD_INIT,
"_vmprof",
"", // doc
-1, // size
VMProfMethods
};
PyMODINIT_FUNC PyInit__vmprof(void)
{
return PyModule_Create(&VmprofModule);
}
#else
PyMODINIT_FUNC init_vmprof(void)
{
Py_InitModule("_vmprof", VMProfMethods);
}
#endif
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