Syntax Directed Translation
Syntax Directed Translation
Syntax Directed Translation
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Dependency Graphs (ASU Ch 5.1 Fig 5.7)<br />
8<br />
• Evaluation order is given by a<br />
topological sort - any TS<br />
gives a valid order of<br />
evaluation for the semantic<br />
rules<br />
• i.e. the dependent attributes<br />
c 1 , c 2 , c 3 , …, c k are known at<br />
the node before f is evaluated<br />
• rule sequence (see figure)<br />
a4 := real<br />
a5 := a4<br />
add_type(id3.entry, a5)<br />
a7 := a5<br />
add_type(id2.entry, a7)<br />
a9 := a7<br />
add_type(id1.entry, a9)<br />
Example directed graph<br />
real id 1 , id 2 , id 3<br />
D<br />
4<br />
T.type = real<br />
L.in = real<br />
real L.in = real , id 3<br />
9<br />
L.in = real , id 2<br />
10<br />
id 1<br />
14/10/2014 DFR - CC - SDT<br />
7<br />
1<br />
5<br />
8<br />
6<br />
2<br />
3
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