do.java

来自「用java实现的编译器. 包括语法分析」· Java 代码 · 共 21 行

package inter;
import symbols.*;
public class Do extends Stmt {
	Expr expr;
	Stmt stmt;
	public Do() { expr = null; stmt = null;}
	public void init(Stmt s, Expr x) {
		expr = x;
		stmt = s;
		if(expr.type != Type.Bool)
			expr.error("boolean required in do");
	}
	public void gen(int b, int a) {
		after = a;
		int label = newlabel();
		stmt.gen(b,label);
		emitlabel(label);
		expr.jumping(b, 0);
	}
}