op_head           460 tools/code_gen.c op *op_head, *op_tail, *cur_func;
op_head           522 tools/code_gen.c         op_head = p;
op_head          1181 tools/code_gen.c     op_head = op_tail = 0;
op_head          1214 tools/code_gen.c     op *p = op_head;