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Ian reported that we allow to parse following:
$ perf stat -e ,cycles true
which is wrong and we should fail, like we do with this fix:
$ perf stat -e ,cycles true
event syntax error: ',cycles'
\___ parser error
The reason is that we don't have rule for ',' in 'event' start condition
and it's matched and accepted by default rule.
Add scanner debug support (that Ian already added for expr code),
which was really useful for finding this. It's enabled together with
bison debug via 'make PARSER_DEBUG=1'.
Reported-by: Ian Rogers <irogers@google.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200520074050.156988-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
ae7626418d