From 3a3ffa2e82205921d1189f1055c22dae4c72819a Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Mon, 18 Nov 2013 21:38:20 -0500 Subject: [PATCH] tools lib traceevent: Report better error message on bad function args When Jiri Olsa was writing a function callback for scsi_trace_parse_cdb(), he thought that the traceevent library had a bug in it because he was getting this error: Error: expected ')' but read ',' Error: expected ')' but read ',' Error: expected ')' but read ',' Error: expected ')' but read ',' But in truth, he didn't have the write number of arguments for the function callback, and the error was the library detecting the discrepancy. A better error message would have prevented the confusion: Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_timeout has more Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_start has more Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_error has more Error: function 'scsi_trace_parse_cdb()' only expects 2 arguments but event scsi_dispatch_cmd_done has more Or Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_timeout only uses 3 Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_start only uses 3 Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_error only uses 3 Error: function 'scsi_trace_parse_cdb()' expects 4 arguments but event scsi_dispatch_cmd_done only uses 3 Signed-off-by: Steven Rostedt Link: http://lkml.kernel.org/n/tip-a4c34w62vl0diitvxb7bt3er@git.kernel.org Signed-off-by: Jiri Olsa Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/traceevent/event-parse.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 9849873265d4..22566c271275 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -2710,7 +2710,6 @@ process_func_handler(struct event_format *event, struct pevent_function_handler struct print_arg *farg; enum event_type type; char *token; - const char *test; int i; arg->type = PRINT_FUNC; @@ -2727,15 +2726,19 @@ process_func_handler(struct event_format *event, struct pevent_function_handler } type = process_arg(event, farg, &token); - if (i < (func->nr_args - 1)) - test = ","; - else - test = ")"; - - if (test_type_token(type, token, EVENT_DELIM, test)) { - free_arg(farg); - free_token(token); - return EVENT_ERROR; + if (i < (func->nr_args - 1)) { + if (type != EVENT_DELIM || strcmp(token, ",") != 0) { + warning("Error: function '%s()' expects %d arguments but event %s only uses %d", + func->name, func->nr_args, + event->name, i + 1); + goto err; + } + } else { + if (type != EVENT_DELIM || strcmp(token, ")") != 0) { + warning("Error: function '%s()' only expects %d arguments but event %s has more", + func->name, func->nr_args, event->name); + goto err; + } } *next_arg = farg; @@ -2747,6 +2750,11 @@ process_func_handler(struct event_format *event, struct pevent_function_handler *tok = token; return type; + +err: + free_arg(farg); + free_token(token); + return EVENT_ERROR; } static enum event_type -- 2.39.5