tools lib traceevent: Optimize pretty_print() function

Each time the pretty_print() function is called to print an event, the
event's format string is parsed. As this format string does not change,
this parsing can be done only once - when the event struct is
initialized.

Link: https://lore.kernel.org/linux-trace-devel/20200529134929.537110-1-tz.stoyanov@gmail.com
Link: http://lore.kernel.org/linux-trace-devel/20200625100516.365338-8-tz.stoyanov@gmail.comSigned-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200702185704.559785000@goodmis.orgSigned-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/traceevent/event-parse-local.h

@@ -85,6 +85,23 @@ struct tep_handle {
 	struct tep_plugins_dir *plugins_dir;
 };
 
+enum tep_print_parse_type {
+	PRINT_FMT_STING,
+	PRINT_FMT_ARG_DIGIT,
+	PRINT_FMT_ARG_POINTER,
+	PRINT_FMT_ARG_STRING,
+};
+
+struct tep_print_parse {
+	struct tep_print_parse	*next;
+
+	char				*format;
+	int				ls;
+	enum tep_print_parse_type	type;
+	struct tep_print_arg		*arg;
+	struct tep_print_arg		*len_as_arg;
+};
+
 void tep_free_event(struct tep_event *event);
 void tep_free_format_field(struct tep_format_field *field);
 void tep_free_plugin_paths(struct tep_handle *tep);

tools/lib/traceevent/event-parse.h

@@ -272,9 +272,12 @@ struct tep_print_arg {
 	};
 };
 
+struct tep_print_parse;
+
 struct tep_print_fmt {
 	char			*format;
 	struct tep_print_arg	*args;
+	struct tep_print_parse	*print_cache;
 };
 
 struct tep_event {