target_limit      297 gc/finalize.c      ptr_t target_limit = p + WORDS_TO_BYTES(hhdr -> hb_sz) - 1;
target_limit      302 gc/finalize.c         scan_limit = target_limit + 1 - sizeof(word);
target_limit      306 gc/finalize.c      	if (r < p || r > target_limit) {