text: /*
   * 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 <linux/bitmap.h>
  #include <linux/time64.h>
  
  #include "../util.h"
  #include <EXTERN.h>
  #include <perl.h>
  
  #include "../../perf.h"
  #include "../callchain.h"
  #include "../machine.h"
  #include "../thread.h"
  #include "../event.h"
  #include "../trace-event.h"
  #include "../evsel.h"
  #include "../debug.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 TRACE_EVENT_TYPE_MAX				\
  	((1 << (sizeof(unsigned short) * 8)) - 1)
  
  static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
  
  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)
  {
  	if (args == NULL)
  		return;
  
  	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:
  		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:
  	case PRINT_HEX_STR:
  		define_event_symbols(event, ev_name, args->hex.field);
  		define_event_symbols(event, ev_name, args->hex.size);
  		break;
  	case PRINT_INT_ARRAY:
  		define_event_symbols(event, ev_name, args->int_array.field);
  		define_event_symbols(event, ev_name, args->int_array.count);
  		define_event_symbols(event, ev_name, args->int_array.el_size);
  		break;
  	case PRINT_BSTRING:
  	case PRINT_DYNAMIC_ARRAY:
  	case PRINT_DYNAMIC_ARRAY_LEN:
  	case PRINT_STRING:
  	case PRINT_BITMASK:
  		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 SV *perl_process_callchain(struct perf_sample *sample,
  				  struct perf_evsel *evsel,
  				  struct addr_location *al)
  {
  	AV *list;
  
  	list = newAV();
  	if (!list)
  		goto exit;
  
  	if (!symbol_conf.use_callchain || !sample->callchain)
  		goto exit;
  
  	if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
  				      sample, NULL, NULL, scripting_max_stack) != 0) {
  		pr_err("Failed to resolve callchain. Skipping\n");
  		goto exit;
  	}
  	callchain_cursor_commit(&callchain_cursor);
  
  
  	while (1) {
  		HV *elem;
  		struct callchain_cursor_node *node;
  		node = callchain_cursor_current(&callchain_cursor);
  		if (!node)
  			break;
  
  		elem = newHV();
  		if (!elem)
  			goto exit;
  
  		if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
  			hv_undef(elem);
  			goto exit;
  		}
  
  		if (node->sym) {
  			HV *sym = newHV();
  			if (!sym) {
  				hv_undef(elem);
  				goto exit;
  			}
  			if (!hv_stores(sym, "start",   newSVuv(node->sym->start)) ||
  			    !hv_stores(sym, "end",     newSVuv(node->sym->end)) ||
  			    !hv_stores(sym, "binding", newSVuv(node->sym->binding)) ||
  			    !hv_stores(sym, "name",    newSVpvn(node->sym->name,
  								node->sym->namelen)) ||
  			    !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
  				hv_undef(sym);
  				hv_undef(elem);
  				goto exit;
  			}
  		}
  
  		if (node->map) {
  			struct map *map = node->map;
  			const char *dsoname = "[unknown]";
  			if (map && map->dso) {
  				if (symbol_conf.show_kernel_path && map->dso->long_name)
  					dsoname = map->dso->long_name;
  				else
  					dsoname = map->dso->name;
  			}
  			if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
  				hv_undef(elem);
  				goto exit;
  			}
  		}
  
  		callchain_cursor_advance(&callchain_cursor);
  		av_push(list, newRV_noinc((SV*)elem));
  	}
  
  exit:
  	return newRV_noinc((SV*)list);
  }
  
  static void perl_process_tracepoint(struct perf_sample *sample,
  				    struct perf_evsel *evsel,
  				    struct addr_location *al)
  {
  	struct thread *thread = al->thread;
  	struct event_format *event = evsel->tp_format;
  	struct format_field *field;
  	static char handler[256];
  	unsigned long long val;
  	unsigned long s, ns;
  	int pid;
  	int cpu = sample->cpu;
  	void *data = sample->raw_data;
  	unsigned long long nsecs = sample->time;
  	const char *comm = thread__comm_str(thread);
  
  	dSP;
  
  	if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
  		return;
  
  	if (!event) {
  		pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
  		return;
  	}
  
  	pid = raw_field_value(event, "common_pid", data);
  
  	sprintf(handler, "%s::%s", event->system, event->name);
  
  	if (!test_and_set_bit(event->id, events_defined))
  		define_event_symbols(event, handler, event->print_fmt.args);
  
  	s = nsecs / NSEC_PER_SEC;
  	ns = nsecs - s * NSEC_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)));
  	XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
  
  	/* 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)));
  		XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
  		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)
  {
  	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 addr_location *al)
  {
  	perl_process_tracepoint(sample, evsel, al);
  	perl_process_event_generic(event, sample, evsel);
  }
  
  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;
  }
  
  static int perl_flush_script(void)
  {
  	return 0;
  }
  
  /*
   * 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");
  
  
  	fprintf(ofp, "\n\
  sub print_backtrace\n\
  {\n\
  	my $callchain = shift;\n\
  	for my $node (@$callchain)\n\
  	{\n\
  		if(exists $node->{sym})\n\
  		{\n\
  			printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
  		}\n\
  		else\n\
  		{\n\
  			printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
  		}\n\
  	}\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, ");
  		fprintf(ofp, "$common_callchain,\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, $common_callchain);\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\n");
  
  		fprintf(ofp, "\tprint_backtrace($common_callchain);\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, $common_callchain) = @_;\n\n");
  
  	fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
  		"$common_secs, $common_nsecs,\n\t             $common_pid, "
  		"$common_comm, $common_callchain);\n");
  	fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
  	fprintf(ofp, "}\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,
  	.flush_script = perl_flush_script,
  	.stop_script = perl_stop_script,
  	.process_event = perl_process_event,
  	.generate_script = perl_generate_script,
  };
  