/* * 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 <ctype.h>#include <errno.h> #include "../../perf.h"#include "../util.h"#include "../trace-event.h" PyMODINIT_FUNC initperf_trace_context(void); #define FTRACE_MAX_EVENT				\	((1 << (sizeof(unsigned short) * 8)) - 1) struct event *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");} 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 *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_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:		/* we should warn... */		return;	} 	if (args->next)		define_event_symbols(event, ev_name, args->next);} static inline struct event *find_cache_event(int type){	static char ev_name[256];	struct event *event; 	if (events[type])		return events[type]; 	events[type] = event = trace_find_event(type);	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_event(union perf_event *pevent __unused,				 struct perf_sample *sample,				 struct perf_evsel *evsel __unused,				 struct perf_session *session __unused,				 struct thread *thread){	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 *event;	unsigned n = 0;	int type;	int pid;	int cpu = sample->cpu;	void *data = sample->raw_data;	unsigned long long nsecs = sample->time;	char *comm = thread->comm; 	t = PyTuple_New(MAX_FIELDS);	if (!t)		Py_FatalError("couldn't create Python tuple"); 	type = trace_parse_common_type(data); 	event = find_cache_event(type);	if (!event)		die("ug! no event found for type %d", type); 	pid = trace_parse_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; 	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_SetItemString(dict, "common_cpu", PyInt_FromLong(cpu));		PyDict_SetItemString(dict, "common_s", PyInt_FromLong(s));		PyDict_SetItemString(dict, "common_ns", PyInt_FromLong(ns));		PyDict_SetItemString(dict, "common_pid", PyInt_FromLong(pid));		PyDict_SetItemString(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(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_SetItemString(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 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;	} 	err = run_start_sub();	if (err) {		fprintf(stderr, "Error starting python script %s\n", script);		goto error;	} 	free(command_line); 	return err;error:	Py_Finalize();	free(command_line); 	return err;} /* * Stop trace script */static int python_stop_script(void){	PyObject *handler, *retval;	int err = 0; 	handler = PyDict_GetItemString(main_dict, "trace_end");	if (handler == NULL || !PyCallable_Check(handler))		goto out; 	retval = PyObject_CallObject(handler, NULL);	if (retval == NULL)		handler_call_die("trace_end");	else		Py_DECREF(retval);out:	Py_XDECREF(main_dict);	Py_XDECREF(main_module);	Py_Finalize(); 	return err;} static int python_generate_script(const char *outfile){	struct event *event = NULL;	struct format_field *f;	char fname[PATH_MAX];	int not_first, count;	FILE *ofp; 	sprintf(fname, "%s.py", outfile);	ofp = fopen(fname, "w");	if (ofp == NULL) {		fprintf(stderr, "couldn't open %s\n", fname);		return -1;	}	fprintf(ofp, "# perf script event handlers, "		"generated by perf script -g python\n"); 	fprintf(ofp, "# Licensed under the terms of the GNU GPL"		" License version 2\n\n"); 	fprintf(ofp, "# The common_* event handler fields are the most useful "		"fields common to\n"); 	fprintf(ofp, "# all events.  They don't necessarily correspond to "		"the 'common_*' fields\n"); 	fprintf(ofp, "# in the format files.  Those fields not available as "		"handler params can\n"); 	fprintf(ofp, "# be retrieved using Python functions of the form "		"common_*(context).\n"); 	fprintf(ofp, "# See the perf-trace-python Documentation for the list "		"of available functions.\n\n"); 	fprintf(ofp, "import os\n");	fprintf(ofp, "import sys\n\n"); 	fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");	fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");	fprintf(ofp, "\nfrom perf_trace_context import *\n");	fprintf(ofp, "from Core import *\n\n\n"); 	fprintf(ofp, "def trace_begin():\n");	fprintf(ofp, "\tprint \"in trace_begin\"\n\n"); 	fprintf(ofp, "def trace_end():\n");	fprintf(ofp, "\tprint \"in trace_end\"\n\n"); 	while ((event = trace_find_next_event(event))) {		fprintf(ofp, "def %s__%s(", event->system, event->name);		fprintf(ofp, "event_name, ");		fprintf(ofp, "context, ");		fprintf(ofp, "common_cpu,\n");		fprintf(ofp, "\tcommon_secs, ");		fprintf(ofp, "common_nsecs, ");		fprintf(ofp, "common_pid, ");		fprintf(ofp, "common_comm,\n\t"); 		not_first = 0;		count = 0; 		for (f = event->format.fields; f; f = f->next) {			if (not_first++)				fprintf(ofp, ", ");

Lines 1–500 of 599. Load more