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Consider the syntax directed definition shown below.$$\begin{array}{ll}
S \rightarrow \mathbf{ id :=} E&\qquad \{gen(\mathbf{ id}.place =;);\}\\
E \rightarrow E_1 + E_2 &\qquad \{t = newtemp();\\
&\qquad gen(t = +;);\\
&\qquad = t;\}\\
E \rightarrow id&\qquad \{ = \mathbf{id}.place;\}
\end{array}$$Here, $gen$ is a function that generates the output code, and $newtemp$ is a function that returns the name of a new temporary variable on every call. Assume that ti's are the temporary variable names generated by $newtemp$. For the statement ‘$X : = Y + Z$’, the $3$-address code sequence generated by this definition is

  1. $X = Y + Z$
  2. $t_1 = Y+Z; X=t_1$
  3. $t_1 =Y; t_2=t_1 +Z; X=t_2$
  4. $t_1 =Y; t_2=Z; t_3=t_1+t_2; X=t_3$
in Compiler Design by Veteran (52.1k points)
edited by | 2.3k views

3 Answers

+24 votes
Best answer

Answer (B)

using given semantic rules.

by Veteran (62.6k points)
edited by
prashant sir t1=y+z
+15 votes

three address code


operand op1 op2  result   

+           y      z      t1

=          t1              x



so ans is b
by Boss (31.2k points)
pooja mam u wrote operand in the place of operand and vice-versa
+6 votes
answer - B
by Loyal (8.6k points)

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