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perf tools: Add flex support for parse_events_error

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Allowing flex parser to report back event parsing error, like:

  $ perf record -e cycles,cache-mises ls
  event syntax error: '..es,cache-mises'
                                 \___ parser error
  ...

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1429729824-13932-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2015-04-22 21:10:17 +02:00
committed by Arnaldo Carvalho de Melo
parent b39b839309
commit 6297d42372
3 changed files with 37 additions and 8 deletions
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37
tools/perf/util/parse-events.l
View File

@@ -3,6 +3,8 @@
%option bison-bridge
%option prefix="parse_events_"
%option stack
%option bison-locations
%option yylineno
%{
#include <errno.h>
@@ -51,6 +53,18 @@ static int str(yyscan_t scanner, int token)
return token;
}
#define REWIND(__alloc) \
do { \
YYSTYPE *__yylval = parse_events_get_lval(yyscanner); \
char *text = parse_events_get_text(yyscanner); \
\
if (__alloc) \
__yylval->str = strdup(text); \
\
yycolumn -= strlen(text); \
yyless(0); \
} while (0)
static int pmu_str_check(yyscan_t scanner)
{
YYSTYPE *yylval = parse_events_get_lval(scanner);
@@ -85,6 +99,13 @@ static int term(yyscan_t scanner, int type)
return PE_TERM;
}
#define YY_USER_ACTION \
do { \
yylloc->last_column = yylloc->first_column; \
yylloc->first_column = yycolumn; \
yycolumn += yyleng; \
} while (0);
%}
%x mem
@@ -119,6 +140,12 @@ modifier_bp [rwx]{1,3}
if (start_token) {
parse_events_set_extra(NULL, yyscanner);
/*
* The flex parser does not init locations variable
* via the scan_string interface, so we need do the
* init in here.
*/
yycolumn = 0;
return start_token;
}
}
@@ -127,19 +154,21 @@ modifier_bp [rwx]{1,3}
<event>{
{group} {
BEGIN(INITIAL); yyless(0);
BEGIN(INITIAL);
REWIND(0);
}
{event_pmu} |
{event} {
str(yyscanner, PE_EVENT_NAME);
BEGIN(INITIAL); yyless(0);
BEGIN(INITIAL);
REWIND(1);
return PE_EVENT_NAME;
}
. |
<<EOF>> {
BEGIN(INITIAL); yyless(0);
BEGIN(INITIAL);
REWIND(0);
}
}