Evaluation of
Expressions: Example 9/16
Example for a + b, where a.value = 10, b.value = 20
T2
{Q2.i := Q1.i + T2.s}
Q2
{Q1.s
:= Q2.s}
{E.s
:= Q1.s}
$
Parser
pushdown:
Semantic
pushdown:
Input: i2 $
Rule: T2 ® F2 {R2.i := F2.s} R2 {T2.s := R2.s}
36/69
E
10
+
20
T1
Q1
F1
R1
i1
e
Illustration:
T2
Q2
+