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Advanced Compilers

This course covers advanced techniques for program analyses and transformations in compilers. Topics include program representations, analysis and transformation algorithms, and applications of these techniques. No background in compilers necessary.

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Advanced Compilers

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  1. Advanced Compilers CSE 231 Instructor: Sorin Lerner

  2. if (…) { x := …; } else { y := …; } …; Compiler Exec Optimizer Parser Code Gen Let’s look at a compiler Compiler

  3. Compiler Compiler Parser Parser Code Gen Code Gen Let’s look at a compiler Optimizer

  4. Advanced Optimizers CSE 231 Instructor: Sorin Lerner

  5. Compiler Parser Code Gen What does an optimizer do? Optimizer

  6. Compiler Parser Code Gen What does an optimizer do? Optimizer • Compute information about a program • Use that information to perform program transformations (with the goal of improving some metric, e.g. performance)

  7. What do these tools have in common? • Bug finders • Program verifiers • Code refactoring tools • Garbage collectors • Runtime monitoring system • And… optimizers

  8. What do these tools have in common? • Bug finders • Program verifiers • Code refactoring tools • Garbage collectors • Runtime monitoring system • And… optimizers They all analyze and transform programs We will learn about the techniques underlying all these tools

  9. Program Analyses, Transformations,and Applications CSE 231 Instructor: Sorin Lerner

  10. Course goals • Understand basic techniques for doing program analyses and transformations • these techniques are the cornerstone of a variety of program analysis tools • they may come in handy, no matter what research you end up doing • Get a feeling for what research is like in the area by reading research papers, and getting your feet wet in a small research project • useful if you don’t have a research area picked • also useful if you have a research area picked: seeing what research is like in other fields will give you a broader perspective

  11. Course topics • Techniques for representing programs • Techniques for analyzing and transforming programs • Applications of these techniques

  12. Course topics (more details) • Representations • Abstract Syntax Tree • Control Flow Graph • Dataflow Graph • Static Single Assignment • Control Dependence Graph • Program Dependence Graph • Call Graph

  13. Course topics (more details) • Analysis/Transformation Algorithms • Dataflow Analysis • Interprocedural analysis • Pointer analysis • Abstract interpretation • Rule-based analyses and transformations • Constraint-based analysis • Interaction between transformations and analyses • Maintaining the program representation intact

  14. Course topics (more details) • Applications • Scalar optimizations • Loop optimizations • Object oriented optimizations • Program verification • Bug finding

  15. Course pre-requisites • No compilers background necessary • Some familiarity with lattices • I will review what is necessary in class, but it helps if you know it already • Some familiarity with functional programming and object-oriented programming • we will look at optimization techniques for these kinds of languages • A standard undergrad cs curriculum will most likely cover the above • Talk to me if you think you don’t have the pre-requisites

  16. Course work • Participation in class (10%) • Take-home midterm and final (45%) • Course project (45%)

  17. Course project • Goal of the project • Get some hands on experience with compilers and/or Get a feel for what research is like in PL • Two kinds of projects: • research-y: explore some interesting ideas and try them out. • implementation-y: pick some existing idea out there, and implement it • paper-y: read 10 good papers on a topic, and write a report summarizing and integrating

  18. Course project • Groups of 2-3 (1 ok in some cases) • I encourage you to pick something that (is related to)/(will advance) your research outside of this class • Milestones • Project proposal (due 2 weeks in) • Mid-point status report (5 weeks in) • Final presentation/written report (end of quarter)

  19. Administrative info • Class web page: • http://cseweb.ucsd.edu/classes/fa11/cse231-a/ • Will post lectures, project info, etc.

  20. Questions?

  21. Program Analyzer Issues (discuss) Input Output Program Analyzer

  22. Program Analyzer Issues (discuss) Input Output Program Analyzer

  23. Program Analyzer Issues (discuss) Input Output Program Analyzer

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