perf/tool: Add support to reuse event grammar to parse out terms

We want to reuse the event grammar for parsing aliased terms.
The obvious reason is we dont need to add new code when there's
already support for this in event grammar.

Doing this by adding terms and event start entries into event
parse grammar. The grammar forks on the begining based on the
starting token, which is supplied via bison interface into the
lexer.  The lexer then returns the starting token as the first
token, thus making the grammar switch accordingly.

Currently 2 starting tokens/grammars are supported:

	PE_START_TERMS, PE_START_EVENTS

The PE_START_TERMS related grammar uses 'event_config' part
of the grammar for term parsing.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1339741902-8449-12-git-send-email-zheng.z.yan@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index ca8665e19c0d5aad44ea5c250f81b681ac2c6232..d002170adb3f47ff42092324479f21c0540a29a3 100644 (file)
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -12,6 +12,7 @@
 #include "header.h"
 #include "debugfs.h"
 #include "parse-events-bison.h"
+#define YY_EXTRA_TYPE int
 #include "parse-events-flex.h"
 #include "pmu.h"
 
@@ -788,13 +789,13 @@ int parse_events_modifier(struct list_head *list, char *str)
        return 0;
 }
 
-static int parse_events__scanner(const char *str, void *data)
+static int parse_events__scanner(const char *str, void *data, int start_token)
 {
        YY_BUFFER_STATE buffer;
        void *scanner;
        int ret;
 
-       ret = parse_events_lex_init(&scanner);
+       ret = parse_events_lex_init_extra(start_token, &scanner);
        if (ret)
                return ret;
 
@@ -811,6 +812,27 @@ static int parse_events__scanner(const char *str, void *data)
        return ret;
 }
 
+/*
+ * parse event config string, return a list of event terms.
+ */
+int parse_events_terms(struct list_head *terms, const char *str)
+{
+       struct parse_events_data__terms data = {
+               .terms = NULL,
+       };
+       int ret;
+
+       ret = parse_events__scanner(str, &data, PE_START_TERMS);
+       if (!ret) {
+               list_splice(data.terms, terms);
+               free(data.terms);
+               return 0;
+       }
+
+       parse_events__free_terms(data.terms);
+       return ret;
+}
+
 int parse_events(struct perf_evlist *evlist, const char *str, int unset __used)
 {
        struct parse_events_data__events data = {
@@ -819,7 +841,7 @@ int parse_events(struct perf_evlist *evlist, const char *str, int unset __used)
        };
        int ret;
 
-       ret = parse_events__scanner(str, &data);
+       ret = parse_events__scanner(str, &data, PE_START_EVENTS);
        if (!ret) {
                int entries = data.idx - evlist->nr_entries;
                perf_evlist__splice_list_tail(evlist, &data.list, entries);

diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index fa2b19b862e2cd5245766f6dcde91fec9a7068f7..9896edadbe62b2cea386eaf2fa37bae744a19793 100644 (file)
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -33,6 +33,7 @@ extern int parse_events_option(const struct option *opt, const char *str,
                               int unset);
 extern int parse_events(struct perf_evlist *evlist, const char *str,
                        int unset);
+extern int parse_events_terms(struct list_head *terms, const char *str);
 extern int parse_filter(const struct option *opt, const char *str, int unset);
 
 #define EVENTS_HELP_MAX (128*1024)
@@ -68,6 +69,10 @@ struct parse_events_data__events {
        int idx;
 };
 
+struct parse_events_data__terms {
+       struct list_head *terms;
+};
+
 int parse_events__is_hardcoded_term(struct parse_events__term *term);
 int parse_events__term_num(struct parse_events__term **_term,
                           int type_term, char *config, long num);

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 329794eea711c926e42128afea3797906795f52b..488362e14133bd4006886858f841828898e531a5 100644 (file)
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -79,6 +79,19 @@ modifier_event       [ukhpGH]{1,8}
 modifier_bp    [rwx]
 
 %%
+
+%{
+       {
+               int start_token;
+
+               start_token = (int) parse_events_get_extra(yyscanner);
+               if (start_token) {
+                       parse_events_set_extra(NULL, yyscanner);
+                       return start_token;
+               }
+         }
+%}
+
 cpu-cycles|cycles                              { return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES); }
 stalled-cycles-frontend|idle-cycles-frontend   { return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND); }
 stalled-cycles-backend|idle-cycles-backend     { return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_BACKEND); }

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 2a93d5c8ccda41719b1d8919c201e663805e19d2..9525c455d27f9b095343b0e8ceaa3a63add8c2fd 100644 (file)
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -25,6 +25,7 @@ do { \
 
 %}
 
+%token PE_START_EVENTS PE_START_TERMS
 %token PE_VALUE PE_VALUE_SYM PE_RAW PE_TERM
 %token PE_NAME
 %token PE_MODIFIER_EVENT PE_MODIFIER_BP
@@ -60,6 +61,11 @@ do { \
 }
 %%
 
+start:
+PE_START_EVENTS events
+|
+PE_START_TERMS  terms
+
 events:
 events ',' event | event
 
@@ -209,6 +215,12 @@ PE_RAW
        $$ = list;
 }
 
+terms: event_config
+{
+       struct parse_events_data__terms *data = _data;
+       data->terms = $1;
+}
+
 event_config:
 event_config ',' event_term
 {