linux-kernel - [PATCH 2/2] perf tools: Fix parsing of unary operator in ?: expression

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Date:	Sun, 25 Mar 2012 23:11:32 +0200
From:	Jörg Sommer <joerg@...a.gnuu.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org
Cc:	Jörg Sommer <joerg@...a.gnuu.de>
Subject: [PATCH 2/2] perf tools: Fix parsing of unary operator in ?: expression

Parsing an expression like

print fmt: "reason %s (%d)", …, REC->errno < 0 ? -REC->errno : REC->reason

in kvm_space_exit fails with

Fatal unknown op ':'

The colon after a simple operator signals the end of this expression. The
token should not be advanced, because the colon is handled in
process_cond(). Hence, it's enough to signal there's an operation
heading.

Signed-off-by: Jörg Sommer <joerg@...a.gnuu.de>
---
An alternative could be:

 --- a/tools/perf/util/trace-event-parse.c
 +++ b/tools/perf/util/trace-event-parse.c
 @@ -1287,7 +1287,7 @@ process_op(struct event *event, struct print_arg *arg, char **tok)
                return EVENT_NONE;
        }
 
-       if (type == EVENT_OP) {
+       if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
                int prio;
 
                /* higher prios need to be closer to the root */


 tools/perf/util/trace-event-parse.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 185e284..d7b5880 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1125,6 +1125,7 @@ static int get_op_prio(char *op)
 		case '|':
 			return 13;
 		case '?':
+		case ':':
 			return 16;
 		default:
 			die("unknown op '%c'", op[0]);
@@ -1202,6 +1203,8 @@ process_op(struct event *event, struct print_arg *arg, char **tok)
 
 		type = process_arg(event, right, tok);
 
+	} else if (strcmp(token, ":") == 0) {
+		return EVENT_OP;
 	} else if (strcmp(token, "?") == 0) {
 
 		left = malloc_or_die(sizeof(*left));
-- 
1.7.9.1

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