seq.java

来自「用java实现的编译器. 包括语法分析」· Java 代码 · 共 23 行

package inter;
public class Seq extends Stmt {
	Stmt stmt1;
	Stmt stmt2;	
	public Seq(Stmt s1, Stmt s2) {
		stmt1 = s1;
		stmt2 = s2;
	}
	public void gen(int b, int a) {
		if(stmt1 == Stmt.Null)
			stmt2.gen(b, a);
		else if(stmt2 == Stmt.Null)
			stmt1.gen(b, a);
		else {
			int label = newlabel();
			stmt1.gen(b, label);
			emitlabel(label);
			stmt2.gen(label,a);
		}
	}

}