tools/perf/util/scripting-engines/trace-event-perl.c - SHIFTPHONES/kernel/common - Gitiles

 /*
  * 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 <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
 #include <linux/bitmap.h>
 #include <linux/time64.h>

 #include <stdbool.h>
 /* perl needs the following define, right after including stdbool.h */
 #define HAS_BOOL
 #include <EXTERN.h>
 #include <perl.h>

 #include "../callchain.h"
 #include "../dso.h"
 #include "../machine.h"
 #include "../map.h"
 #include "../symbol.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 tep_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 tep_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 tep_event *event,
 				 const char *ev_name,
 				 struct tep_print_arg *args)
 {
 	if (args == NULL)
 		return;

 	switch (args->type) {
 	case TEP_PRINT_NULL:
 		break;
 	case TEP_PRINT_ATOM:
 		define_flag_value(ev_name, cur_field_name, "0",
 				  args->atom.atom);
 		zero_flag_atom = 0;
 		break;
 	case TEP_PRINT_FIELD:
 		free(cur_field_name);
 		cur_field_name = strdup(args->field.name);
 		break;
 	case TEP_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 TEP_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 TEP_PRINT_HEX:
 	case TEP_PRINT_HEX_STR:
 		define_event_symbols(event, ev_name, args->hex.field);
 		define_event_symbols(event, ev_name, args->hex.size);
 		break;
 	case TEP_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 TEP_PRINT_BSTRING:
 	case TEP_PRINT_DYNAMIC_ARRAY:
 	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
 	case TEP_PRINT_STRING:
 	case TEP_PRINT_BITMASK:
 		break;
 	case TEP_PRINT_TYPE:
 		define_event_symbols(event, ev_name, args->typecast.item);
 		break;
 	case TEP_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 TEP_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 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 evsel *evsel,
 				    struct addr_location *al)
 {
 	struct thread *thread = al->thread;
 	struct tep_event *event = evsel->tp_format;
 	struct tep_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->core.attr.type != PERF_TYPE_TRACEPOINT)
 		return;

 	if (!event) {
 		pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.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->tep;

 	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 & TEP_FIELD_IS_STRING) {
 			int offset;
 			if (field->flags & TEP_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 & TEP_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 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->core.attr, sizeof(evsel->core.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 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 tep_handle *pevent, const char *outfile)
 {
 	struct tep_event *event = NULL;
 	struct tep_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 & TEP_FIELD_IS_STRING ||
 			    f->flags & TEP_FIELD_IS_FLAG ||
 			    f->flags & TEP_FIELD_IS_SYMBOLIC)
 				fprintf(ofp, "%%s");
 			else if (f->flags & TEP_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 & TEP_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 & TEP_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,
 };
	/*
	* 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 <inttypes.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#include <errno.h>
	#include <linux/bitmap.h>
	#include <linux/time64.h>

	#include <stdbool.h>
	/* perl needs the following define, right after including stdbool.h */
	#define HAS_BOOL
	#include <EXTERN.h>
	#include <perl.h>

	#include "../callchain.h"
	#include "../dso.h"
	#include "../machine.h"
	#include "../map.h"
	#include "../symbol.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 tep_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 tep_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 tep_event *event,
	const char *ev_name,
	struct tep_print_arg *args)
	{
	if (args == NULL)
	return;

	switch (args->type) {
	case TEP_PRINT_NULL:
	break;
	case TEP_PRINT_ATOM:
	define_flag_value(ev_name, cur_field_name, "0",
	args->atom.atom);
	zero_flag_atom = 0;
	break;
	case TEP_PRINT_FIELD:
	free(cur_field_name);
	cur_field_name = strdup(args->field.name);
	break;
	case TEP_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 TEP_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 TEP_PRINT_HEX:
	case TEP_PRINT_HEX_STR:
	define_event_symbols(event, ev_name, args->hex.field);
	define_event_symbols(event, ev_name, args->hex.size);
	break;
	case TEP_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 TEP_PRINT_BSTRING:
	case TEP_PRINT_DYNAMIC_ARRAY:
	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
	case TEP_PRINT_STRING:
	case TEP_PRINT_BITMASK:
	break;
	case TEP_PRINT_TYPE:
	define_event_symbols(event, ev_name, args->typecast.item);
	break;
	case TEP_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 TEP_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 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 evsel *evsel,
	struct addr_location *al)
	{
	struct thread *thread = al->thread;
	struct tep_event *event = evsel->tp_format;
	struct tep_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->core.attr.type != PERF_TYPE_TRACEPOINT)
	return;

	if (!event) {
	pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.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->tep;

	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 & TEP_FIELD_IS_STRING) {
	int offset;
	if (field->flags & TEP_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 & TEP_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 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->core.attr, sizeof(evsel->core.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 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 tep_handle pevent, const char outfile)
	{
	struct tep_event *event = NULL;
	struct tep_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 & TEP_FIELD_IS_STRING \|\|
	f->flags & TEP_FIELD_IS_FLAG \|\|
	f->flags & TEP_FIELD_IS_SYMBOLIC)
	fprintf(ofp, "%%s");
	else if (f->flags & TEP_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 & TEP_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 & TEP_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,
	};