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P8

姓名：田昊东 学号：211275022

编译原理作业 p 8

6.6.1 image.png

^690668

//产生式
S -> for(s1;B;S2)S3
//语义规则
B.true=newlable()
B.false=S.next
S1.next=newlable()
S2.next=S1.next
S3.next=newlable()
S.code=S1.code
    ||lable(S1.next)||B.code
    ||lable(B.true)||s3.code
    ||lable(s3.next)||s2.code
    ||gen('goto',s1.next)