expr__get_id
if (expr__get_id(haystack, cur->pkey, &data))
if (expr__get_id(ctx, id, datap) || !*datap) {
int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
!expr__get_id(m->pctx, tool_pmu__event_to_str(i), &data))
if (!expr__get_id(left->pctx, tool_pmu__event_to_str(i), &data))
if (!expr__get_id(right->pctx, tool_pmu__event_to_str(i), &data))