[linux-2.6-block.git] / tools / perf / util / scripting-engines / trace-event-python.c

/*
 * 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(int cpu, void *data,
				 int size __unused,
				 unsigned long long nsecs, char *comm)
{
	PyObject *handler, *retval, *context, *t, *obj;
	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;

	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);

	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++,
			PyCObject_FromVoidPtr(scripting_context, NULL));
	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));

	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);
			}
		}
		PyTuple_SetItem(t, n++, obj);
	}

	if (_PyTuple_Resize(&t, n) == -1)
		Py_FatalError("error resizing Python tuple");

	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);
	} else {
		handler = PyDict_GetItemString(main_dict, "trace_unhandled");
		if (handler && PyCallable_Check(handler)) {
			if (_PyTuple_Resize(&t, N_COMMON_FIELDS) == -1)
				Py_FatalError("error resizing Python tuple");

			retval = PyObject_CallObject(handler, t);
			if (retval == NULL)
				handler_call_die("trace_unhandled");
		}
	}

	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 trace event handlers, "
		"generated by perf trace -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, ", ");
			if (++count % 5 == 0)
				fprintf(ofp, "\n\t");

			fprintf(ofp, "%s", f->name);
		}
		fprintf(ofp, "):\n");

		fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
			"common_secs, common_nsecs,\n\t\t\t"
			"common_pid, common_comm)\n\n");

		fprintf(ofp, "\t\tprint \"");

		not_first = 0;
		count = 0;

		for (f = event->format.fields; f; f = f->next) {
			if (not_first++)
				fprintf(ofp, ", ");
			if (count && count % 3 == 0) {
				fprintf(ofp, "\" \\\n\t\t\"");
			}
			count++;

			fprintf(ofp, "%s=", f->name);
			if (f->flags & FIELD_IS_STRING ||
			    f->flags & FIELD_IS_FLAG ||
			    f->flags & FIELD_IS_SYMBOLIC)
				fprintf(ofp, "%%s");
			else if (f->flags & FIELD_IS_SIGNED)
				fprintf(ofp, "%%d");
			else
				fprintf(ofp, "%%u");
		}

		fprintf(ofp, "\\n\" %% \\\n\t\t(");

		not_first = 0;
		count = 0;

		for (f = event->format.fields; f; f = f->next) {
			if (not_first++)
				fprintf(ofp, ", ");

			if (++count % 5 == 0)
				fprintf(ofp, "\n\t\t");

			if (f->flags & FIELD_IS_FLAG) {
				if ((count - 1) % 5 != 0) {
					fprintf(ofp, "\n\t\t");
					count = 4;
				}
				fprintf(ofp, "flag_str(\"");
				fprintf(ofp, "%s__%s\", ", event->system,
					event->name);
				fprintf(ofp, "\"%s\", %s)", f->name,
					f->name);
			} else if (f->flags & FIELD_IS_SYMBOLIC) {
				if ((count - 1) % 5 != 0) {
					fprintf(ofp, "\n\t\t");
					count = 4;
				}
				fprintf(ofp, "symbol_str(\"");
				fprintf(ofp, "%s__%s\", ", event->system,
					event->name);
				fprintf(ofp, "\"%s\", %s)", f->name,
					f->name);
			} else
				fprintf(ofp, "%s", f->name);
		}

		fprintf(ofp, "),\n\n");
	}

	fprintf(ofp, "def trace_unhandled(event_name, context, "
		"common_cpu, common_secs, common_nsecs,\n\t\t"
		"common_pid, common_comm):\n");

	fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
		"common_secs, common_nsecs,\n\t\tcommon_pid, "
		"common_comm)\n\n");

	fprintf(ofp, "def print_header("
		"event_name, cpu, secs, nsecs, pid, comm):\n"
		"\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
		"(event_name, cpu, secs, nsecs, pid, comm),\n");

	fclose(ofp);

	fprintf(stderr, "generated Python script: %s\n", fname);

	return 0;
}

struct scripting_ops python_scripting_ops = {
	.name = "Python",
	.start_script = python_start_script,
	.stop_script = python_stop_script,
	.process_event = python_process_event,
	.generate_script = python_generate_script,
};
Commit	Line	Data
7e4b21b8 TZ	1	/*
	2	* trace-event-python. Feed trace events to an embedded Python interpreter.
	3	*
	4	* Copyright (C) 2010 Tom Zanussi <tzanussi@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	#include <Python.h>
	23
	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <ctype.h>
	28	#include <errno.h>
	29
	30	#include "../../perf.h"
	31	#include "../util.h"
	32	#include "../trace-event.h"
	33
	34	PyMODINIT_FUNC initperf_trace_context(void);
	35
	36	#define FTRACE_MAX_EVENT \
	37	((1 << (sizeof(unsigned short) * 8)) - 1)
	38
	39	struct event *events[FTRACE_MAX_EVENT];
	40
	41	#define MAX_FIELDS 64
	42	#define N_COMMON_FIELDS 7
	43
	44	extern struct scripting_context *scripting_context;
	45
	46	static char *cur_field_name;
	47	static int zero_flag_atom;
	48
	49	static PyObject main_module, main_dict;
	50
	51	static void handler_call_die(const char *handler_name)
	52	{
	53	PyErr_Print();
	54	Py_FatalError("problem in Python trace event handler");
	55	}
	56
	57	static void define_value(enum print_arg_type field_type,
	58	const char *ev_name,
	59	const char *field_name,
	60	const char *field_value,
	61	const char *field_str)
	62	{
	63	const char *handler_name = "define_flag_value";
	64	PyObject handler, t, *retval;
65	unsigned long long value;
66	unsigned n = 0;
67
68	if (field_type == PRINT_SYMBOL)
69	handler_name = "define_symbolic_value";
70
44ad9cd8	71	t = PyTuple_New(4);
7e4b21b8 TZ	72	if (!t)
	73	Py_FatalError("couldn't create Python tuple");
	74
	75	value = eval_flag(field_value);
	76
	77	PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
	78	PyTuple_SetItem(t, n++, PyString_FromString(field_name));
	79	PyTuple_SetItem(t, n++, PyInt_FromLong(value));
	80	PyTuple_SetItem(t, n++, PyString_FromString(field_str));
	81
7e4b21b8 TZ	82	handler = PyDict_GetItemString(main_dict, handler_name);
	83	if (handler && PyCallable_Check(handler)) {
	84	retval = PyObject_CallObject(handler, t);
	85	if (retval == NULL)
	86	handler_call_die(handler_name);
	87	}
	88
	89	Py_DECREF(t);
	90	}
	91
	92	static void define_values(enum print_arg_type field_type,
	93	struct print_flag_sym *field,
	94	const char *ev_name,
	95	const char *field_name)
	96	{
	97	define_value(field_type, ev_name, field_name, field->value,
	98	field->str);
	99
	100	if (field->next)
	101	define_values(field_type, field->next, ev_name, field_name);
	102	}
	103
	104	static void define_field(enum print_arg_type field_type,
	105	const char *ev_name,
	106	const char *field_name,
	107	const char *delim)
	108	{
	109	const char *handler_name = "define_flag_field";
	110	PyObject handler, t, *retval;
	111	unsigned n = 0;
	112
	113	if (field_type == PRINT_SYMBOL)
	114	handler_name = "define_symbolic_field";
	115
44ad9cd8 TZ	116	if (field_type == PRINT_FLAGS)
	117	t = PyTuple_New(3);
	118	else
	119	t = PyTuple_New(2);
7e4b21b8 TZ	120	if (!t)
	121	Py_FatalError("couldn't create Python tuple");
	122
	123	PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
	124	PyTuple_SetItem(t, n++, PyString_FromString(field_name));
	125	if (field_type == PRINT_FLAGS)
	126	PyTuple_SetItem(t, n++, PyString_FromString(delim));
	127
7e4b21b8 TZ	128	handler = PyDict_GetItemString(main_dict, handler_name);
	129	if (handler && PyCallable_Check(handler)) {
	130	retval = PyObject_CallObject(handler, t);
	131	if (retval == NULL)
	132	handler_call_die(handler_name);
	133	}
	134
	135	Py_DECREF(t);
	136	}
	137
	138	static void define_event_symbols(struct event *event,
	139	const char *ev_name,
	140	struct print_arg *args)
	141	{
	142	switch (args->type) {
	143	case PRINT_NULL:
	144	break;
	145	case PRINT_ATOM:
	146	define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
	147	args->atom.atom);
	148	zero_flag_atom = 0;
	149	break;
	150	case PRINT_FIELD:
	151	if (cur_field_name)
	152	free(cur_field_name);
	153	cur_field_name = strdup(args->field.name);
	154	break;
	155	case PRINT_FLAGS:
	156	define_event_symbols(event, ev_name, args->flags.field);
	157	define_field(PRINT_FLAGS, ev_name, cur_field_name,
	158	args->flags.delim);
	159	define_values(PRINT_FLAGS, args->flags.flags, ev_name,
	160	cur_field_name);
	161	break;
	162	case PRINT_SYMBOL:
	163	define_event_symbols(event, ev_name, args->symbol.field);
	164	define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
	165	define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
	166	cur_field_name);
	167	break;
	168	case PRINT_STRING:
	169	break;
	170	case PRINT_TYPE:
	171	define_event_symbols(event, ev_name, args->typecast.item);
	172	break;
	173	case PRINT_OP:
	174	if (strcmp(args->op.op, ":") == 0)
	175	zero_flag_atom = 1;
	176	define_event_symbols(event, ev_name, args->op.left);
	177	define_event_symbols(event, ev_name, args->op.right);
	178	break;
	179	default:
	180	/* we should warn... */
	181	return;
	182	}
	183
	184	if (args->next)
	185	define_event_symbols(event, ev_name, args->next);
	186	}
	187
	188	static inline struct event *find_cache_event(int type)
	189	{
	190	static char ev_name[256];
	191	struct event *event;
192
193	if (events[type])
194	return events[type];
195
196	events[type] = event = trace_find_event(type);
197	if (!event)
198	return NULL;
199
200	sprintf(ev_name, "%s__%s", event->system, event->name);
201
202	define_event_symbols(event, ev_name, event->print_fmt.args);
203
204	return event;
205	}
206
207	static void python_process_event(int cpu, void *data,
208	int size __unused,
209	unsigned long long nsecs, char *comm)
210	{
b1dcc03c	211	PyObject handler, retval, context, t, *obj;
7e4b21b8 TZ	212	static char handler_name[256];
	213	struct format_field *field;
	214	unsigned long long val;
	215	unsigned long s, ns;
	216	struct event *event;
	217	unsigned n = 0;
	218	int type;
	219	int pid;
	220
	221	t = PyTuple_New(MAX_FIELDS);
	222	if (!t)
	223	Py_FatalError("couldn't create Python tuple");
	224
	225	type = trace_parse_common_type(data);
	226
	227	event = find_cache_event(type);
	228	if (!event)
	229	die("ug! no event found for type %d", type);
	230
	231	pid = trace_parse_common_pid(data);
	232
	233	sprintf(handler_name, "%s__%s", event->system, event->name);
	234
	235	s = nsecs / NSECS_PER_SEC;
	236	ns = nsecs - s * NSECS_PER_SEC;
	237
	238	scripting_context->event_data = data;
	239
	240	context = PyCObject_FromVoidPtr(scripting_context, NULL);
	241
	242	PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
	243	PyTuple_SetItem(t, n++,
	244	PyCObject_FromVoidPtr(scripting_context, NULL));
	245	PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
	246	PyTuple_SetItem(t, n++, PyInt_FromLong(s));
	247	PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
	248	PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
	249	PyTuple_SetItem(t, n++, PyString_FromString(comm));
	250
	251	for (field = event->format.fields; field; field = field->next) {
	252	if (field->flags & FIELD_IS_STRING) {
	253	int offset;
	254	if (field->flags & FIELD_IS_DYNAMIC) {
	255	offset = (int )(data + field->offset);
	256	offset &= 0xffff;
	257	} else
	258	offset = field->offset;
b1dcc03c	259	obj = PyString_FromString((char *)data + offset);
7e4b21b8 TZ	260	} else { /* FIELD_IS_NUMERIC */
	261	val = read_size(data + field->offset, field->size);
	262	if (field->flags & FIELD_IS_SIGNED) {
b1dcc03c TZ	263	if ((long long)val >= LONG_MIN &&
	264	(long long)val <= LONG_MAX)
	265	obj = PyInt_FromLong(val);
	266	else
	267	obj = PyLong_FromLongLong(val);
7e4b21b8	268	} else {
b1dcc03c TZ	269	if (val <= LONG_MAX)
	270	obj = PyInt_FromLong(val);
	271	else
	272	obj = PyLong_FromUnsignedLongLong(val);
7e4b21b8 TZ	273	}
7e4b21b8 TZ	274	}
b1dcc03c	275	PyTuple_SetItem(t, n++, obj);
7e4b21b8 TZ	276	}
	277
	278	if (_PyTuple_Resize(&t, n) == -1)
	279	Py_FatalError("error resizing Python tuple");
	280
	281	handler = PyDict_GetItemString(main_dict, handler_name);
	282	if (handler && PyCallable_Check(handler)) {
	283	retval = PyObject_CallObject(handler, t);
	284	if (retval == NULL)
	285	handler_call_die(handler_name);
	286	} else {
	287	handler = PyDict_GetItemString(main_dict, "trace_unhandled");
	288	if (handler && PyCallable_Check(handler)) {
	289	if (_PyTuple_Resize(&t, N_COMMON_FIELDS) == -1)
	290	Py_FatalError("error resizing Python tuple");
	291
	292	retval = PyObject_CallObject(handler, t);
	293	if (retval == NULL)
	294	handler_call_die("trace_unhandled");
	295	}
	296	}
	297
	298	Py_DECREF(t);
	299	}
	300
	301	static int run_start_sub(void)
	302	{
	303	PyObject handler, retval;
	304	int err = 0;
	305
	306	main_module = PyImport_AddModule("__main__");
	307	if (main_module == NULL)
	308	return -1;
	309	Py_INCREF(main_module);
	310
	311	main_dict = PyModule_GetDict(main_module);
	312	if (main_dict == NULL) {
	313	err = -1;
	314	goto error;
	315	}
	316	Py_INCREF(main_dict);
	317
	318	handler = PyDict_GetItemString(main_dict, "trace_begin");
	319	if (handler == NULL \|\| !PyCallable_Check(handler))
	320	goto out;
	321
	322	retval = PyObject_CallObject(handler, NULL);
	323	if (retval == NULL)
	324	handler_call_die("trace_begin");
	325
	326	Py_DECREF(retval);
	327	return err;
	328	error:
	329	Py_XDECREF(main_dict);
	330	Py_XDECREF(main_module);
	331	out:
	332	return err;
	333	}
	334
	335	/*
	336	* Start trace script
	337	*/
	338	static int python_start_script(const char script, int argc, const char *argv)
	339	{
340	const char **command_line;
341	char buf[PATH_MAX];
342	int i, err = 0;
343	FILE *fp;
344
345	command_line = malloc((argc + 1) * sizeof(const char *));
346	command_line[0] = script;
347	for (i = 1; i < argc + 1; i++)
348	command_line[i] = argv[i - 1];
349
350	Py_Initialize();
351
352	initperf_trace_context();
353
354	PySys_SetArgv(argc + 1, (char **)command_line);
355
356	fp = fopen(script, "r");
357	if (!fp) {
358	sprintf(buf, "Can't open python script \"%s\"", script);
359	perror(buf);
360	err = -1;
361	goto error;
362	}
363
364	err = PyRun_SimpleFile(fp, script);
365	if (err) {
366	fprintf(stderr, "Error running python script %s\n", script);
367	goto error;
368	}
369
370	err = run_start_sub();
371	if (err) {
372	fprintf(stderr, "Error starting python script %s\n", script);
373	goto error;
374	}
375
376	free(command_line);
7e4b21b8 TZ	377
	378	return err;
	379	error:
	380	Py_Finalize();
	381	free(command_line);
	382
	383	return err;
	384	}
	385
	386	/*
	387	* Stop trace script
	388	*/
	389	static int python_stop_script(void)
	390	{
	391	PyObject handler, retval;
	392	int err = 0;
	393
	394	handler = PyDict_GetItemString(main_dict, "trace_end");
	395	if (handler == NULL \|\| !PyCallable_Check(handler))
	396	goto out;
	397
	398	retval = PyObject_CallObject(handler, NULL);
	399	if (retval == NULL)
	400	handler_call_die("trace_end");
	401	else
	402	Py_DECREF(retval);
	403	out:
	404	Py_XDECREF(main_dict);
	405	Py_XDECREF(main_module);
	406	Py_Finalize();
	407
7e4b21b8 TZ	408	return err;
	409	}
	410
	411	static int python_generate_script(const char *outfile)
	412	{
	413	struct event *event = NULL;
	414	struct format_field *f;
	415	char fname[PATH_MAX];
	416	int not_first, count;
	417	FILE *ofp;
	418
	419	sprintf(fname, "%s.py", outfile);
	420	ofp = fopen(fname, "w");
	421	if (ofp == NULL) {
	422	fprintf(stderr, "couldn't open %s\n", fname);
	423	return -1;
	424	}
	425	fprintf(ofp, "# perf trace event handlers, "
	426	"generated by perf trace -g python\n");
	427
	428	fprintf(ofp, "# Licensed under the terms of the GNU GPL"
	429	" License version 2\n\n");
	430
	431	fprintf(ofp, "# The common_* event handler fields are the most useful "
	432	"fields common to\n");
	433
	434	fprintf(ofp, "# all events. They don't necessarily correspond to "
	435	"the 'common_*' fields\n");
	436
	437	fprintf(ofp, "# in the format files. Those fields not available as "
	438	"handler params can\n");
	439
	440	fprintf(ofp, "# be retrieved using Python functions of the form "
	441	"common_*(context).\n");
	442
	443	fprintf(ofp, "# See the perf-trace-python Documentation for the list "
	444	"of available functions.\n\n");
	445
	446	fprintf(ofp, "import os\n");
	447	fprintf(ofp, "import sys\n\n");
	448
	449	fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
	450	fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
	451	fprintf(ofp, "\nfrom perf_trace_context import *\n");
	452	fprintf(ofp, "from Core import *\n\n\n");
	453
	454	fprintf(ofp, "def trace_begin():\n");
	455	fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
	456
	457	fprintf(ofp, "def trace_end():\n");
	458	fprintf(ofp, "\tprint \"in trace_end\"\n\n");
	459
	460	while ((event = trace_find_next_event(event))) {
	461	fprintf(ofp, "def %s__%s(", event->system, event->name);
	462	fprintf(ofp, "event_name, ");
	463	fprintf(ofp, "context, ");
	464	fprintf(ofp, "common_cpu,\n");
	465	fprintf(ofp, "\tcommon_secs, ");
	466	fprintf(ofp, "common_nsecs, ");
	467	fprintf(ofp, "common_pid, ");
	468	fprintf(ofp, "common_comm,\n\t");
	469
	470	not_first = 0;
	471	count = 0;
472
473	for (f = event->format.fields; f; f = f->next) {
474	if (not_first++)
475	fprintf(ofp, ", ");
476	if (++count % 5 == 0)
477	fprintf(ofp, "\n\t");
478
479	fprintf(ofp, "%s", f->name);
480	}
481	fprintf(ofp, "):\n");
482
483	fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
484	"common_secs, common_nsecs,\n\t\t\t"
485	"common_pid, common_comm)\n\n");
486
487	fprintf(ofp, "\t\tprint \"");
488
489	not_first = 0;
490	count = 0;
491
492	for (f = event->format.fields; f; f = f->next) {
493	if (not_first++)
494	fprintf(ofp, ", ");
495	if (count && count % 3 == 0) {
496	fprintf(ofp, "\" \\\n\t\t\"");
497	}
498	count++;
499
500	fprintf(ofp, "%s=", f->name);
501	if (f->flags & FIELD_IS_STRING \|\|
502	f->flags & FIELD_IS_FLAG \|\|
503	f->flags & FIELD_IS_SYMBOLIC)
504	fprintf(ofp, "%%s");
505	else if (f->flags & FIELD_IS_SIGNED)
506	fprintf(ofp, "%%d");
507	else
508	fprintf(ofp, "%%u");
509	}
510
511	fprintf(ofp, "\\n\" %% \\\n\t\t(");
512
513	not_first = 0;
514	count = 0;
515
516	for (f = event->format.fields; f; f = f->next) {
517	if (not_first++)
518	fprintf(ofp, ", ");
519
520	if (++count % 5 == 0)
521	fprintf(ofp, "\n\t\t");
522
523	if (f->flags & FIELD_IS_FLAG) {
524	if ((count - 1) % 5 != 0) {
525	fprintf(ofp, "\n\t\t");
526	count = 4;
527	}
528	fprintf(ofp, "flag_str(\"");
529	fprintf(ofp, "%s__%s\", ", event->system,
530	event->name);
531	fprintf(ofp, "\"%s\", %s)", f->name,
532	f->name);
533	} else if (f->flags & FIELD_IS_SYMBOLIC) {
534	if ((count - 1) % 5 != 0) {
535	fprintf(ofp, "\n\t\t");
536	count = 4;
537	}
538	fprintf(ofp, "symbol_str(\"");
539	fprintf(ofp, "%s__%s\", ", event->system,
540	event->name);
541	fprintf(ofp, "\"%s\", %s)", f->name,
542	f->name);
543	} else
544	fprintf(ofp, "%s", f->name);
545	}
546
547	fprintf(ofp, "),\n\n");
548	}
549
550	fprintf(ofp, "def trace_unhandled(event_name, context, "
551	"common_cpu, common_secs, common_nsecs,\n\t\t"
552	"common_pid, common_comm):\n");
553
554	fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
555	"common_secs, common_nsecs,\n\t\tcommon_pid, "
556	"common_comm)\n\n");
557
558	fprintf(ofp, "def print_header("
559	"event_name, cpu, secs, nsecs, pid, comm):\n"
560	"\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
561	"(event_name, cpu, secs, nsecs, pid, comm),\n");
562
563	fclose(ofp);
564
565	fprintf(stderr, "generated Python script: %s\n", fname);
566
567	return 0;
568	}
569
570	struct scripting_ops python_scripting_ops = {
571	.name = "Python",
572	.start_script = python_start_script,
573	.stop_script = python_stop_script,
574	.process_event = python_process_event,
575	.generate_script = python_generate_script,
576	};