Syntax Directed Translation
Syntax Directed Translation
Syntax Directed Translation
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Top-Down <strong>Translation</strong> (ASU Ch 5.5 Fig 5.25)<br />
• Grammar<br />
• transformed translation scheme with right recursive<br />
grammar (i.e. grammar + interleaved semantic actions)<br />
1. E T R<br />
2. R + T R 1<br />
3. R - T R 1<br />
4. R ¤<br />
5. T ( E )<br />
6. T num<br />
1. E T { R.i := T.val } R { E.val := R.s }<br />
2. R + T { R 1 .i := R.i + T.val } R 1 { R.s := R 1 .s }<br />
3. R - T { R 1 .i := R.i - T.val } R 1 { R.s := R 1 .s }<br />
4. R ¤ { R.s := R.i }<br />
5. T ( E ) { T.val := E.val }<br />
6. T num { T.val := num.val }<br />
X.i - inherited attribute<br />
X.s - synthesised attribute<br />
20<br />
14/10/2014 DFR - CC - SDT
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