get_bound_block
bb_ret = get_bound_block(ep, stmt->ret);
struct basic_block *bb_return = get_bound_block(ep, ret);
struct basic_block *bb_case = get_bound_block(ep, sym);
add_goto(ep, get_bound_block(ep, stmt->goto_label));
add_goto(ep, get_bound_block(ep, expr->label_symbol));
struct basic_block *bb_computed = get_bound_block(ep, sym);