Consider the following grammar for the if and while statements:

stmt $-->$ if$-$stmt $|$ while$-$stmt

if$-$stmt $-->$ if $($ exp $)$ stmt $|$ if $($exp $)$ stmt else stmt

while$-$stmt $-$ while $($exp$)$ stmt

exp $-->$ term relop term

term $-->$ id $|$ num

a$)(15$ marks$)$ Write an attribute grammar for generating three$-$address code for the above grammar

b$)(10$ marks$)$ Give the sequence of three$-$address code instructions corresponding to the following fragment:

while $($a$>$b$)$

if $|$:$=$exp$-=$exp,exp,expstmt$||$