/* * trace-event-python.  Feed trace events to an embedded Python interpreter. * * Copyright (C) 2010 Tom Zanussi <tzanussi@gmail.com> * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * */ #include <Python.h> #include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h> #include "../../perf.h"#include "../evsel.h"#include "../util.h"#include "../event.h"#include "../thread.h"#include "../trace-event.h" PyMODINIT_FUNC initperf_trace_context(void); #define FTRACE_MAX_EVENT				\	((1 << (sizeof(unsigned short) * 8)) - 1) struct event_format *events[FTRACE_MAX_EVENT]; #define MAX_FIELDS	64#define N_COMMON_FIELDS	7 extern struct scripting_context *scripting_context; static char *cur_field_name;static int zero_flag_atom; static PyObject *main_module, *main_dict; static void handler_call_die(const char *handler_name){	PyErr_Print();	Py_FatalError("problem in Python trace event handler");} /* * Insert val into into the dictionary and decrement the reference counter. * This is necessary for dictionaries since PyDict_SetItemString() does not  * steal a reference, as opposed to PyTuple_SetItem(). */static void pydict_set_item_string_decref(PyObject *dict, const char *key, PyObject *val){	PyDict_SetItemString(dict, key, val);	Py_DECREF(val);} static void define_value(enum print_arg_type field_type,			 const char *ev_name,			 const char *field_name,			 const char *field_value,			 const char *field_str){	const char *handler_name = "define_flag_value";	PyObject *handler, *t, *retval;	unsigned long long value;	unsigned n = 0; 	if (field_type == PRINT_SYMBOL)		handler_name = "define_symbolic_value"; 	t = PyTuple_New(4);	if (!t)		Py_FatalError("couldn't create Python tuple"); 	value = eval_flag(field_value); 	PyTuple_SetItem(t, n++, PyString_FromString(ev_name));	PyTuple_SetItem(t, n++, PyString_FromString(field_name));	PyTuple_SetItem(t, n++, PyInt_FromLong(value));	PyTuple_SetItem(t, n++, PyString_FromString(field_str)); 	handler = PyDict_GetItemString(main_dict, handler_name);	if (handler && PyCallable_Check(handler)) {		retval = PyObject_CallObject(handler, t);		if (retval == NULL)			handler_call_die(handler_name);	} 	Py_DECREF(t);} static void define_values(enum print_arg_type field_type,			  struct print_flag_sym *field,			  const char *ev_name,			  const char *field_name){	define_value(field_type, ev_name, field_name, field->value,		     field->str); 	if (field->next)		define_values(field_type, field->next, ev_name, field_name);} static void define_field(enum print_arg_type field_type,			 const char *ev_name,			 const char *field_name,			 const char *delim){	const char *handler_name = "define_flag_field";	PyObject *handler, *t, *retval;	unsigned n = 0; 	if (field_type == PRINT_SYMBOL)		handler_name = "define_symbolic_field"; 	if (field_type == PRINT_FLAGS)		t = PyTuple_New(3);	else		t = PyTuple_New(2);	if (!t)		Py_FatalError("couldn't create Python tuple"); 	PyTuple_SetItem(t, n++, PyString_FromString(ev_name));	PyTuple_SetItem(t, n++, PyString_FromString(field_name));	if (field_type == PRINT_FLAGS)		PyTuple_SetItem(t, n++, PyString_FromString(delim)); 	handler = PyDict_GetItemString(main_dict, handler_name);	if (handler && PyCallable_Check(handler)) {		retval = PyObject_CallObject(handler, t);		if (retval == NULL)			handler_call_die(handler_name);	} 	Py_DECREF(t);} static void define_event_symbols(struct event_format *event,				 const char *ev_name,				 struct print_arg *args){	switch (args->type) {	case PRINT_NULL:		break;	case PRINT_ATOM:		define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",			     args->atom.atom);		zero_flag_atom = 0;		break;	case PRINT_FIELD:		if (cur_field_name)			free(cur_field_name);		cur_field_name = strdup(args->field.name);		break;	case PRINT_FLAGS:		define_event_symbols(event, ev_name, args->flags.field);		define_field(PRINT_FLAGS, ev_name, cur_field_name,			     args->flags.delim);		define_values(PRINT_FLAGS, args->flags.flags, ev_name,			      cur_field_name);		break;	case PRINT_SYMBOL:		define_event_symbols(event, ev_name, args->symbol.field);		define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);		define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,			      cur_field_name);		break;	case PRINT_HEX:		define_event_symbols(event, ev_name, args->hex.field);		define_event_symbols(event, ev_name, args->hex.size);		break;	case PRINT_STRING:		break;	case PRINT_TYPE:		define_event_symbols(event, ev_name, args->typecast.item);		break;	case PRINT_OP:		if (strcmp(args->op.op, ":") == 0)			zero_flag_atom = 1;		define_event_symbols(event, ev_name, args->op.left);		define_event_symbols(event, ev_name, args->op.right);		break;	default:		/* gcc warns for these? */	case PRINT_BSTRING:	case PRINT_DYNAMIC_ARRAY:	case PRINT_FUNC:		/* we should warn... */		return;	} 	if (args->next)		define_event_symbols(event, ev_name, args->next);} static inline struct event_format *find_cache_event(struct perf_evsel *evsel){	static char ev_name[256];	struct event_format *event;	int type = evsel->attr.config; 	/* 	 * XXX: Do we really need to cache this since now we have evsel->tp_format 	 * cached already? Need to re-read this "cache" routine that as well calls 	 * define_event_symbols() :-\ 	 */	if (events[type])		return events[type]; 	events[type] = event = evsel->tp_format;	if (!event)		return NULL; 	sprintf(ev_name, "%s__%s", event->system, event->name); 	define_event_symbols(event, ev_name, event->print_fmt.args); 	return event;} static void python_process_tracepoint(union perf_event *perf_event				      __maybe_unused,				 struct perf_sample *sample,				 struct perf_evsel *evsel,				 struct machine *machine __maybe_unused,				 struct thread *thread,				 struct addr_location *al){	PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;	static char handler_name[256];	struct format_field *field;	unsigned long long val;	unsigned long s, ns;	struct event_format *event;	unsigned n = 0;	int pid;	int cpu = sample->cpu;	void *data = sample->raw_data;	unsigned long long nsecs = sample->time;	const char *comm = thread__comm_str(thread); 	t = PyTuple_New(MAX_FIELDS);	if (!t)		Py_FatalError("couldn't create Python tuple"); 	event = find_cache_event(evsel);	if (!event)		die("ug! no event found for type %d", (int)evsel->attr.config); 	pid = raw_field_value(event, "common_pid", data); 	sprintf(handler_name, "%s__%s", event->system, event->name); 	handler = PyDict_GetItemString(main_dict, handler_name);	if (handler && !PyCallable_Check(handler))		handler = NULL;	if (!handler) {		dict = PyDict_New();		if (!dict)			Py_FatalError("couldn't create Python dict");	}	s = nsecs / NSECS_PER_SEC;	ns = nsecs - s * NSECS_PER_SEC; 	scripting_context->event_data = data;	scripting_context->pevent = evsel->tp_format->pevent; 	context = PyCObject_FromVoidPtr(scripting_context, NULL); 	PyTuple_SetItem(t, n++, PyString_FromString(handler_name));	PyTuple_SetItem(t, n++, context); 	if (handler) {		PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));		PyTuple_SetItem(t, n++, PyInt_FromLong(s));		PyTuple_SetItem(t, n++, PyInt_FromLong(ns));		PyTuple_SetItem(t, n++, PyInt_FromLong(pid));		PyTuple_SetItem(t, n++, PyString_FromString(comm));	} else {		pydict_set_item_string_decref(dict, "common_cpu", PyInt_FromLong(cpu));		pydict_set_item_string_decref(dict, "common_s", PyInt_FromLong(s));		pydict_set_item_string_decref(dict, "common_ns", PyInt_FromLong(ns));		pydict_set_item_string_decref(dict, "common_pid", PyInt_FromLong(pid));		pydict_set_item_string_decref(dict, "common_comm", PyString_FromString(comm));	}	for (field = event->format.fields; field; field = field->next) {		if (field->flags & FIELD_IS_STRING) {			int offset;			if (field->flags & FIELD_IS_DYNAMIC) {				offset = *(int *)(data + field->offset);				offset &= 0xffff;			} else				offset = field->offset;			obj = PyString_FromString((char *)data + offset);		} else { /* FIELD_IS_NUMERIC */			val = read_size(event, data + field->offset,					field->size);			if (field->flags & FIELD_IS_SIGNED) {				if ((long long)val >= LONG_MIN &&				    (long long)val <= LONG_MAX)					obj = PyInt_FromLong(val);				else					obj = PyLong_FromLongLong(val);			} else {				if (val <= LONG_MAX)					obj = PyInt_FromLong(val);				else					obj = PyLong_FromUnsignedLongLong(val);			}		}		if (handler)			PyTuple_SetItem(t, n++, obj);		else			pydict_set_item_string_decref(dict, field->name, obj); 	}	if (!handler)		PyTuple_SetItem(t, n++, dict); 	if (_PyTuple_Resize(&t, n) == -1)		Py_FatalError("error resizing Python tuple"); 	if (handler) {		retval = PyObject_CallObject(handler, t);		if (retval == NULL)			handler_call_die(handler_name);	} else {		handler = PyDict_GetItemString(main_dict, "trace_unhandled");		if (handler && PyCallable_Check(handler)) { 			retval = PyObject_CallObject(handler, t);			if (retval == NULL)				handler_call_die("trace_unhandled");		}		Py_DECREF(dict);	} 	Py_DECREF(t);} static void python_process_general_event(union perf_event *perf_event					 __maybe_unused,					 struct perf_sample *sample,					 struct perf_evsel *evsel,					 struct machine *machine __maybe_unused,					 struct thread *thread,					 struct addr_location *al){	PyObject *handler, *retval, *t, *dict;	static char handler_name[64];	unsigned n = 0; 	/*	 * Use the MAX_FIELDS to make the function expandable, though	 * currently there is only one item for the tuple.	 */	t = PyTuple_New(MAX_FIELDS);	if (!t)		Py_FatalError("couldn't create Python tuple"); 	dict = PyDict_New();	if (!dict)		Py_FatalError("couldn't create Python dictionary"); 	snprintf(handler_name, sizeof(handler_name), "%s", "process_event"); 	handler = PyDict_GetItemString(main_dict, handler_name);	if (!handler || !PyCallable_Check(handler))		goto exit; 	pydict_set_item_string_decref(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));	pydict_set_item_string_decref(dict, "attr", PyString_FromStringAndSize(			(const char *)&evsel->attr, sizeof(evsel->attr)));	pydict_set_item_string_decref(dict, "sample", PyString_FromStringAndSize(			(const char *)sample, sizeof(*sample)));	pydict_set_item_string_decref(dict, "raw_buf", PyString_FromStringAndSize(			(const char *)sample->raw_data, sample->raw_size));	pydict_set_item_string_decref(dict, "comm",			PyString_FromString(thread__comm_str(thread)));	if (al->map) {		pydict_set_item_string_decref(dict, "dso",			PyString_FromString(al->map->dso->name));	}	if (al->sym) {		pydict_set_item_string_decref(dict, "symbol",			PyString_FromString(al->sym->name));	} 	PyTuple_SetItem(t, n++, dict);	if (_PyTuple_Resize(&t, n) == -1)		Py_FatalError("error resizing Python tuple"); 	retval = PyObject_CallObject(handler, t);	if (retval == NULL)		handler_call_die(handler_name);exit:	Py_DECREF(dict);	Py_DECREF(t);} static void python_process_event(union perf_event *perf_event,				 struct perf_sample *sample,				 struct perf_evsel *evsel,				 struct machine *machine,				 struct thread *thread,				 struct addr_location *al){	switch (evsel->attr.type) {	case PERF_TYPE_TRACEPOINT:		python_process_tracepoint(perf_event, sample, evsel,					  machine, thread, al);		break;	/* Reserve for future process_hw/sw/raw APIs */	default:		python_process_general_event(perf_event, sample, evsel,					     machine, thread, al);	}} static int run_start_sub(void){	PyObject *handler, *retval;	int err = 0; 	main_module = PyImport_AddModule("__main__");	if (main_module == NULL)		return -1;	Py_INCREF(main_module); 	main_dict = PyModule_GetDict(main_module);	if (main_dict == NULL) {		err = -1;		goto error;	}	Py_INCREF(main_dict); 	handler = PyDict_GetItemString(main_dict, "trace_begin");	if (handler == NULL || !PyCallable_Check(handler))		goto out; 	retval = PyObject_CallObject(handler, NULL);	if (retval == NULL)		handler_call_die("trace_begin"); 	Py_DECREF(retval);	return err;error:	Py_XDECREF(main_dict);	Py_XDECREF(main_module);out:	return err;} /* * Start trace script */static int python_start_script(const char *script, int argc, const char **argv){	const char **command_line;	char buf[PATH_MAX];	int i, err = 0;	FILE *fp; 	command_line = malloc((argc + 1) * sizeof(const char *));	command_line[0] = script;	for (i = 1; i < argc + 1; i++)		command_line[i] = argv[i - 1]; 	Py_Initialize(); 	initperf_trace_context(); 	PySys_SetArgv(argc + 1, (char **)command_line); 	fp = fopen(script, "r");	if (!fp) {		sprintf(buf, "Can't open python script \"%s\"", script);		perror(buf);		err = -1;		goto error;	} 	err = PyRun_SimpleFile(fp, script);	if (err) {		fprintf(stderr, "Error running python script %s\n", script);		goto error;	}

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