public void parse_sema_whi(Exp_whi whi) {
s++;
Exp_Operate opter = new Exp_Operate();
opter.op = type_op.LABEL;
opter.result = getLabel();
list_op.add(opter);
Exp_Operate opt = new Exp_Operate();
Exp_cond condition = whi.condition;
Exp_mark m1 = (Exp_mark) condition.left;
Exp_mark m2 = (Exp_mark) condition.right;
opt.op = get_compare_mark(condition.exp_comp);
opt.s = backString(m1, type_cal.NUM);
opt.d = backString(m2, type_cal.NUM);
opt.result = getLabel(); // 跳转标签
list_op.add(opt);
Exp_B exp = (Exp_B) whi.next;
exec_exp_B(exp, null);
Exp_Operate op1 = new Exp_Operate();
op1.op = type_op.JMP;
op1.result = opter.result;
list_op.add(op1);
Exp_Operate op2 = new Exp_Operate();
op2.op = type_op.LABEL;
op2.result = opt.result;
list_op.add(op2);
s--;
st.check_Dimension(s);
}
public void parse_sema_ife(Exp_ife ife) {
s++;
Exp_Operate opt = new Exp_Operate();
Exp_cond condition = ife.condition;
Exp_mark m1 = (Exp_mark) condition.left;
Exp_mark m2 = (Exp_mark) condition.right;
opt.op = get_compare_mark(condition.exp_comp);
if (m1 != null) {
opt.s = backString(m1, type_cal.NUM);
}
if (m2 != null) {
opt.d = backString(m2, type_cal.NUM);
}
opt.result = getLabel(); // 跳转标签
list_op.add(opt);
Exp_B exp_left = (Exp_B) ife.left;
Exp_B exp_right = (Exp_B) ife.right;
if (exp_left != null) {
exec_exp_B(exp_left, null);
}
// 如果有else
if (exp_right != null) {
exec_exp_B(exp_right, opt.result);
} else {
Exp_Operate operate = new Exp_Operate();
operate.op = type_op.LABEL;
operate.result = opt.result;
list_op.add(operate);
}
s--;
List<Integer> list = st.check_Dimension(s); // 返回那些引用数目为0的变量
// 优化部分
if (list != null) {
int i = 0;
while (i < list.size()) {
list_op.remove(list.get(i));
i++;
}
}
}
