[PATCH v3 01/12] perf parse-events: Refactor get_config_terms() to remove macros

James Clark
2025-12-12T15:32:44Z

The ADD_CONFIG_TERM() macros build the __type argument out of a partial
EVSEL__CONFIG_TERM_x enum name. This means that they can't be called
from a function where __type is a variable and it's also impossible to
grep the codebase to find usages of these enums as they're never typed
in full.

Fix this by removing the macros and replacing them with an
add_config_term() function. It seems the main reason these existed in
the first place was to avoid type punning and to write to a specific
field in the union, but the same thing can be achieved with a single
write to a u64 'val' field.

Running the Perf tests with "-fsanitize=undefined -fno-sanitize-recover"
results in no new issues as a result of this change.

Signed-off-by: James Clark <james.clark@linaro.org>
---
tools/perf/util/evsel_config.h | 1 +
tools/perf/util/parse-events.c | 146 ++++++++++++++++++++++++-----------------
2 files changed, 86 insertions(+), 61 deletions(-)

diff --git a/tools/perf/util/evsel_config.h b/tools/perf/util/evsel_config.h
index bcd3a978f0c415a8829d3fa37e9dd6bf664b39f2..685fd8d5c4a88fb8ae601ded60c1fc36dde73403 100644
--- a/tools/perf/util/evsel_config.h
+++ b/tools/perf/util/evsel_config.h
@@ -50,6 +50,7 @@ struct evsel_config_term {
u64 cfg_chg;
char *str;
int cpu;
+ u64 val;
} val;
bool weak;
};
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 17c1c36a7bf9a3ec08812c4de700e3a3b3e547cc..46422286380f33a48087e7079a45bb21beb2d573 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1116,105 +1116,107 @@ static int config_attr(struct perf_event_attr *attr,
return 0;
}

-static int get_config_terms(const struct parse_events_terms *head_config,
- struct list_head *head_terms)
+static struct evsel_config_term *add_config_term(enum evsel_term_type type,
+ struct list_head *head_terms,
+ bool weak)
{
-#define ADD_CONFIG_TERM(__type, __weak) \
- struct evsel_config_term *__t; \
- \
- __t = zalloc(sizeof(*__t)); \
- if (!__t) \
- return -ENOMEM; \
- \
- INIT_LIST_HEAD(&__t->list); \
- __t->type = EVSEL__CONFIG_TERM_ ## __type; \
- __t->weak = __weak; \
- list_add_tail(&__t->list, head_terms)
-
-#define ADD_CONFIG_TERM_VAL(__type, __name, __val, __weak) \
-do { \
- ADD_CONFIG_TERM(__type, __weak); \
- __t->val.__name = __val; \
-} while (0)
+ struct evsel_config_term *t;

-#define ADD_CONFIG_TERM_STR(__type, __val, __weak) \
-do { \
- ADD_CONFIG_TERM(__type, __weak); \
- __t->val.str = strdup(__val); \
- if (!__t->val.str) { \
- zfree(&__t); \
- return -ENOMEM; \
- } \
- __t->free_str = true; \
-} while (0)
+ t = zalloc(sizeof(*t));
+ if (!t)
+ return NULL;
+
+ INIT_LIST_HEAD(&t->list);
+ t->type = type;
+ t->weak = weak;
+ list_add_tail(&t->list, head_terms);

+ return t;
+}
+
+static int get_config_terms(const struct parse_events_terms *head_config,
+ struct list_head *head_terms)
+{
struct parse_events_term *term;

list_for_each_entry(term, &head_config->terms, list) {
+ struct evsel_config_term *new_term;
+ enum evsel_term_type new_type;
+ bool str_type = false;
+ u64 val;
+
switch (term->type_term) {
case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
- ADD_CONFIG_TERM_VAL(PERIOD, period, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_PERIOD;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
- ADD_CONFIG_TERM_VAL(FREQ, freq, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_FREQ;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_TIME:
- ADD_CONFIG_TERM_VAL(TIME, time, term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_TIME;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_CALLGRAPH:
- ADD_CONFIG_TERM_STR(CALLGRAPH, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_CALLGRAPH;
+ str_type = true;
break;
case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
- ADD_CONFIG_TERM_STR(BRANCH, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_BRANCH;
+ str_type = true;
break;
case PARSE_EVENTS__TERM_TYPE_STACKSIZE:
- ADD_CONFIG_TERM_VAL(STACK_USER, stack_user,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_STACK_USER;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_INHERIT:
- ADD_CONFIG_TERM_VAL(INHERIT, inherit,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_INHERIT;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_NOINHERIT:
- ADD_CONFIG_TERM_VAL(INHERIT, inherit,
- term->val.num ? 0 : 1, term->weak);
+ new_type = EVSEL__CONFIG_TERM_INHERIT;
+ val = term->val.num ? 0 : 1;
break;
case PARSE_EVENTS__TERM_TYPE_MAX_STACK:
- ADD_CONFIG_TERM_VAL(MAX_STACK, max_stack,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_MAX_STACK;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_MAX_EVENTS:
- ADD_CONFIG_TERM_VAL(MAX_EVENTS, max_events,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_MAX_EVENTS;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_OVERWRITE:
- ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_OVERWRITE;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_NOOVERWRITE:
- ADD_CONFIG_TERM_VAL(OVERWRITE, overwrite,
- term->val.num ? 0 : 1, term->weak);
+ new_type = EVSEL__CONFIG_TERM_OVERWRITE;
+ val = term->val.num ? 0 : 1;
break;
case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
- ADD_CONFIG_TERM_STR(DRV_CFG, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_DRV_CFG;
+ str_type = true;
break;
case PARSE_EVENTS__TERM_TYPE_PERCORE:
- ADD_CONFIG_TERM_VAL(PERCORE, percore,
- term->val.num ? true : false, term->weak);
+ new_type = EVSEL__CONFIG_TERM_PERCORE;
+ val = term->val.num ? true : false;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT:
- ADD_CONFIG_TERM_VAL(AUX_OUTPUT, aux_output,
- term->val.num ? 1 : 0, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_OUTPUT;
+ val = term->val.num ? 1 : 0;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_ACTION:
- ADD_CONFIG_TERM_STR(AUX_ACTION, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_ACTION;
+ str_type = true;
break;
case PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE:
- ADD_CONFIG_TERM_VAL(AUX_SAMPLE_SIZE, aux_sample_size,
- term->val.num, term->weak);
+ new_type = EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE;
+ val = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_RATIO_TO_PREV:
- ADD_CONFIG_TERM_STR(RATIO_TO_PREV, term->val.str, term->weak);
+ new_type = EVSEL__CONFIG_TERM_RATIO_TO_PREV;
+ str_type = true;
break;
case PARSE_EVENTS__TERM_TYPE_USER:
case PARSE_EVENTS__TERM_TYPE_CONFIG:
@@ -1229,7 +1231,23 @@ do { \
case PARSE_EVENTS__TERM_TYPE_RAW:
case PARSE_EVENTS__TERM_TYPE_CPU:
default:
- break;
+ /* Don't add a new term for these ones */
+ continue;
+ }
+
+ new_term = add_config_term(new_type, head_terms, term->weak);
+ if (!new_term)
+ return -ENOMEM;
+
+ if (str_type) {
+ new_term->val.str = strdup(term->val.str);
+ if (!new_term->val.str) {
+ zfree(&new_term);
+ return -ENOMEM;
+ }
+ new_term->free_str = true;
+ } else {
+ new_term->val.val = val;
}
}
return 0;
@@ -1290,10 +1308,16 @@ static int get_config_chgs(struct perf_pmu *pmu, struct parse_events_terms *head
}
}

- if (bits)
- ADD_CONFIG_TERM_VAL(CFG_CHG, cfg_chg, bits, false);
+ if (bits) {
+ struct evsel_config_term *new_term;
+
+ new_term = add_config_term(EVSEL__CONFIG_TERM_CFG_CHG,
+ head_terms, false);
+ if (!new_term)
+ return -ENOMEM;
+ new_term->val.cfg_chg = bits;
+ }

-#undef ADD_CONFIG_TERM
return 0;
}

--
2.34.1