in src/c/perf-map-agent.c [100:108]
void generate_unfolded_entry(jvmtiEnv *jvmti, jmethodID method, char *buffer, size_t buffer_size, const char *root_name) {
if (unfold_simple)
sig_string(jvmti, method, buffer, buffer_size);
else {
char entry_name[1000];
sig_string(jvmti, method, entry_name, sizeof(entry_name));
snprintf(buffer, buffer_size, "%s in %s", entry_name, root_name);
}
}