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linux/tools/perf/util/scripting-engines/trace-event-perl.c
Tom Zanussi 2de9533d6d perf script: hook up perf_scripting_context->pevent 
Running the check-perf-trace scripts causes segfaults in both the Perl
and Python cases:

  # perf script record check-perf-trace
  # perf script -s libexec/perf-core/scripts/python/check-perf-trace.py
  trace_begin
  Segmentation fault (core dumped)

The reason is that the 'pevent' field was added to
perf_scripting_context but it wasn't hooked up with an actual pevent in
either case, so when one of the 'common' fields is accessed (in
util/trace-event-parse.c:get_common_fields()), pevent->events tries to
dereference a NULL pointer.

This sets the pevent field when the scripting context is set up.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Link: http://lkml.kernel.org/r/d2b1b8166a6ca0a36e1f5255b88a8289058ba236.1358527965.git.tom.zanussi@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-01-24 16:40:52 -03:00

644 lines
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/*
* trace-event-perl. Feed perf script events to an embedded Perl interpreter.
*
* Copyright (C) 2009 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "../util.h"
#include <EXTERN.h>
#include <perl.h>
#include "../../perf.h"
#include "../thread.h"
#include "../event.h"
#include "../trace-event.h"
#include "../evsel.h"
void boot_Perf__Trace__Context(pTHX_ CV *cv);
void boot_DynaLoader(pTHX_ CV *cv);
typedef PerlInterpreter * INTERP;
void xs_init(pTHX);
void xs_init(pTHX)
{
const char *file = __FILE__;
dXSUB_SYS;
newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
file);
newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
}
INTERP my_perl;
#define FTRACE_MAX_EVENT \
((1 << (sizeof(unsigned short) * 8)) - 1)
struct event_format *events[FTRACE_MAX_EVENT];
extern struct scripting_context *scripting_context;
static char *cur_field_name;
static int zero_flag_atom;
static void define_symbolic_value(const char *ev_name,
const char *field_name,
const char *field_value,
const char *field_str)
{
unsigned long long value;
dSP;
value = eval_flag(field_value);
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
XPUSHs(sv_2mortal(newSVuv(value)));
XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
PUTBACK;
if (get_cv("main::define_symbolic_value", 0))
call_pv("main::define_symbolic_value", G_SCALAR);
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
static void define_symbolic_values(struct print_flag_sym *field,
const char *ev_name,
const char *field_name)
{
define_symbolic_value(ev_name, field_name, field->value, field->str);
if (field->next)
define_symbolic_values(field->next, ev_name, field_name);
}
static void define_symbolic_field(const char *ev_name,
const char *field_name)
{
dSP;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
PUTBACK;
if (get_cv("main::define_symbolic_field", 0))
call_pv("main::define_symbolic_field", G_SCALAR);
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
static void define_flag_value(const char *ev_name,
const char *field_name,
const char *field_value,
const char *field_str)
{
unsigned long long value;
dSP;
value = eval_flag(field_value);
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
XPUSHs(sv_2mortal(newSVuv(value)));
XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
PUTBACK;
if (get_cv("main::define_flag_value", 0))
call_pv("main::define_flag_value", G_SCALAR);
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
static void define_flag_values(struct print_flag_sym *field,
const char *ev_name,
const char *field_name)
{
define_flag_value(ev_name, field_name, field->value, field->str);
if (field->next)
define_flag_values(field->next, ev_name, field_name);
}
static void define_flag_field(const char *ev_name,
const char *field_name,
const char *delim)
{
dSP;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
XPUSHs(sv_2mortal(newSVpv(delim, 0)));
PUTBACK;
if (get_cv("main::define_flag_field", 0))
call_pv("main::define_flag_field", G_SCALAR);
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
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_flag_value(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_flag_field(ev_name, cur_field_name, args->flags.delim);
define_flag_values(args->flags.flags, ev_name, cur_field_name);
break;
case PRINT_SYMBOL:
define_event_symbols(event, ev_name, args->symbol.field);
define_symbolic_field(ev_name, cur_field_name);
define_symbolic_values(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_BSTRING:
case PRINT_DYNAMIC_ARRAY:
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;
case PRINT_FUNC:
default:
pr_err("Unsupported print arg type\n");
/* 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;
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 perl_process_tracepoint(union perf_event *perf_event __maybe_unused,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine __maybe_unused,
struct addr_location *al)
{
struct format_field *field;
static char handler[256];
unsigned long long val;
unsigned long s, ns;
struct event_format *event;
int pid;
int cpu = sample->cpu;
void *data = sample->raw_data;
unsigned long long nsecs = sample->time;
struct thread *thread = al->thread;
char *comm = thread->comm;
dSP;
if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
return;
event = find_cache_event(evsel);
if (!event)
die("ug! no event found for type %" PRIu64, evsel->attr.config);
pid = raw_field_value(event, "common_pid", data);
sprintf(handler, "%s::%s", event->system, event->name);
s = nsecs / NSECS_PER_SEC;
ns = nsecs - s * NSECS_PER_SEC;
scripting_context->event_data = data;
scripting_context->pevent = evsel->tp_format->pevent;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpv(handler, 0)));
XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
XPUSHs(sv_2mortal(newSVuv(cpu)));
XPUSHs(sv_2mortal(newSVuv(s)));
XPUSHs(sv_2mortal(newSVuv(ns)));
XPUSHs(sv_2mortal(newSViv(pid)));
XPUSHs(sv_2mortal(newSVpv(comm, 0)));
/* common fields other than pid can be accessed via xsub fns */
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;
XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
} else { /* FIELD_IS_NUMERIC */
val = read_size(event, data + field->offset,
field->size);
if (field->flags & FIELD_IS_SIGNED) {
XPUSHs(sv_2mortal(newSViv(val)));
} else {
XPUSHs(sv_2mortal(newSVuv(val)));
}
}
}
PUTBACK;
if (get_cv(handler, 0))
call_pv(handler, G_SCALAR);
else if (get_cv("main::trace_unhandled", 0)) {
XPUSHs(sv_2mortal(newSVpv(handler, 0)));
XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
XPUSHs(sv_2mortal(newSVuv(cpu)));
XPUSHs(sv_2mortal(newSVuv(nsecs)));
XPUSHs(sv_2mortal(newSViv(pid)));
XPUSHs(sv_2mortal(newSVpv(comm, 0)));
call_pv("main::trace_unhandled", G_SCALAR);
}
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
static void perl_process_event_generic(union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine __maybe_unused,
struct addr_location *al __maybe_unused)
{
dSP;
if (!get_cv("process_event", 0))
return;
ENTER;
SAVETMPS;
PUSHMARK(SP);
XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
PUTBACK;
call_pv("process_event", G_SCALAR);
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
}
static void perl_process_event(union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine,
struct addr_location *al)
{
perl_process_tracepoint(event, sample, evsel, machine, al);
perl_process_event_generic(event, sample, evsel, machine, al);
}
static void run_start_sub(void)
{
dSP; /* access to Perl stack */
PUSHMARK(SP);
if (get_cv("main::trace_begin", 0))
call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
}
/*
* Start trace script
*/
static int perl_start_script(const char *script, int argc, const char **argv)
{
const char **command_line;
int i, err = 0;
command_line = malloc((argc + 2) * sizeof(const char *));
command_line[0] = "";
command_line[1] = script;
for (i = 2; i < argc + 2; i++)
command_line[i] = argv[i - 2];
my_perl = perl_alloc();
perl_construct(my_perl);
if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
(char **)NULL)) {
err = -1;
goto error;
}
if (perl_run(my_perl)) {
err = -1;
goto error;
}
if (SvTRUE(ERRSV)) {
err = -1;
goto error;
}
run_start_sub();
free(command_line);
return 0;
error:
perl_free(my_perl);
free(command_line);
return err;
}
/*
* Stop trace script
*/
static int perl_stop_script(void)
{
dSP; /* access to Perl stack */
PUSHMARK(SP);
if (get_cv("main::trace_end", 0))
call_pv("main::trace_end", G_DISCARD | G_NOARGS);
perl_destruct(my_perl);
perl_free(my_perl);
return 0;
}
static int perl_generate_script(struct pevent *pevent, const char *outfile)
{
struct event_format *event = NULL;
struct format_field *f;
char fname[PATH_MAX];
int not_first, count;
FILE *ofp;
sprintf(fname, "%s.pl", 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 perl\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 Perl functions of the form "
"common_*($context).\n");
fprintf(ofp, "# See Context.pm for the list of available "
"functions.\n\n");
fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
"Perf-Trace-Util/lib\";\n");
fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
fprintf(ofp, "use Perf::Trace::Core;\n");
fprintf(ofp, "use Perf::Trace::Context;\n");
fprintf(ofp, "use Perf::Trace::Util;\n\n");
fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n\n");
while ((event = trace_find_next_event(pevent, event))) {
fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
fprintf(ofp, "\tmy (");
fprintf(ofp, "$event_name, ");
fprintf(ofp, "$context, ");
fprintf(ofp, "$common_cpu, ");
fprintf(ofp, "$common_secs, ");
fprintf(ofp, "$common_nsecs,\n");
fprintf(ofp, "\t $common_pid, ");
fprintf(ofp, "$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, "$%s", f->name);
}
fprintf(ofp, ") = @_;\n\n");
fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
"$common_secs, $common_nsecs,\n\t "
"$common_pid, $common_comm);\n\n");
fprintf(ofp, "\tprintf(\"");
not_first = 0;
count = 0;
for (f = event->format.fields; f; f = f->next) {
if (not_first++)
fprintf(ofp, ", ");
if (count && count % 4 == 0) {
fprintf(ofp, "\".\n\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 ");
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 ");
if (f->flags & FIELD_IS_FLAG) {
if ((count - 1) % 5 != 0) {
fprintf(ofp, "\n\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 ");
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");
fprintf(ofp, "}\n\n");
}
fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
"$common_cpu, $common_secs, $common_nsecs,\n\t "
"$common_pid, $common_comm) = @_;\n\n");
fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
"$common_secs, $common_nsecs,\n\t $common_pid, "
"$common_comm);\n}\n\n");
fprintf(ofp, "sub print_header\n{\n"
"\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
"\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t "
"$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
fprintf(ofp,
"\n# Packed byte string args of process_event():\n"
"#\n"
"# $event:\tunion perf_event\tutil/event.h\n"
"# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
"# $sample:\tstruct perf_sample\tutil/event.h\n"
"# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
"\n"
"sub process_event\n"
"{\n"
"\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
"\n"
"\tmy @event\t= unpack(\"LSS\", $event);\n"
"\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
"\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
"\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
"\n"
"\tuse Data::Dumper;\n"
"\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
"}\n");
fclose(ofp);
fprintf(stderr, "generated Perl script: %s\n", fname);
return 0;
}
struct scripting_ops perl_scripting_ops = {
.name = "Perl",
.start_script = perl_start_script,
.stop_script = perl_stop_script,
.process_event = perl_process_event,
.generate_script = perl_generate_script,
};
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