Apr03 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
CSE302: Compiler Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering Lehigh University April 3, 2007
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/03/07 Outline ± Recap ± Syntax-directed translation (Chapter 5) ± Summary and homework
Background image of page 2
Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/03/07 SDD’s ± For synthesized attributes ± Perform bottom-up tree traversal for attribute evaluation ± An SDD is S-attributed if every attribute is synthesized ± For SDD’s with both inherited and synthesized attributes ± Dependency graphs ± An SDD is L-attributed if in all of its dependency graphs the edges only go from left to right but not from right to left
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/03/07 Syntax-directed Translation Schemes ± Note that SDD is used for specifications ± SDD SDT ± SDT’s are implemented during parsing without building a parse tree ± S-attributed SDD based on LR-parsable grammar ± L-attributed SDD based on LL-parsable grammar
Background image of page 4
Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/03/07 S-attributed SDD’s Based on LR- parsable Grammars ± SDD SDT ± Construct an SDT where actions are placed at the end of the productions corresponding to semantic rules ± Postfix SDT’s ± SDD Production Semantic rules T T 1 * F T.val = T 1 .val * F.val T F T.val = F.val F digit F.val = digit .lexval ± SDT T T 1 * F { T.val = T 1 .val * F.val; } T F { T.val = F.val; } F digit { F.val = digit .lexval; } ± An action is executed along with the reduction of the body to the head of the associated production
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Instructor: Dr. Liang Cheng CSE302: Compiler Design 04/03/07 Parser-Stack Implementation of
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2008 for the course CSE 302 taught by Professor Cheng during the Spring '07 term at Lehigh University .

Page1 / 22

Apr03 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online