alloca_base      1255 ext/mbstring/oniguruma/regexec.c   char *alloca_base;
alloca_base      1268 ext/mbstring/oniguruma/regexec.c   STACK_INIT(alloca_base, n, INIT_MATCH_STACK_SIZE);
alloca_base      1271 ext/mbstring/oniguruma/regexec.c   repeat_stk = (OnigStackIndex* )alloca_base;