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Honors Compilers

This project involves writing a compiler for a subset of Algol-68 to target MMIX architecture. The compiler will be written in its own language and should be bootstrapped, meaning it can compile itself.

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Honors Compilers

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  1. Honors Compilers The Course Project Feb 28th 2002

  2. The Goal • Write a compiler for a subset of Algol-68 • The compiler to be written in its own language (i.e. in the chosen subset) • Targetted to MMIX • Bootstrapped (Compiler can compile itself)

  3. The Language to be Compiled • A subset of Algol-68 (roughly Algol-68S) • You get to choose the exact subset • Required elements • int, bool, char primitive modes • ref, [], struct, proc modes • Normal declaration and statement forms • Including if/endif and do/od loops • All ordinary expression forms • Compile a single procedure (acts as main)

  4. Optional Language Elements • 1-d arrays required, 2-d etc optional • Union modes optional • Floating-point processing optional • Garbage collection optional • Case/esac optional • Implement separately compiled modules • Good error messages

  5. Optimization • Aim for a reasonable level of code quality • At least minimal register allocation • Preferably attempt at least some global optimization

  6. Input/Output • You must be able to read and write files (treated as a sequence of char) • Exact provision of facilities is up to you

  7. Lexical Structure • Standard Algol-68 lexical elements • Use upper case for bold, lower case for non-bold. • Lexical structure to be defined by your second assignment.

  8. Third assignment • Due right after the break • Exact description of subset you will implement • Indicate possible optional additions • Provide BNF of language grammar

  9. Fourth Assignment • Take grammar you devised for your subset. • Modify grammar to be acceptable as bison input, and use output bison to parse a small program.

  10. Fifth Assignment • Provide complete design document for compiler • Exact details of what is to be implemented • Internal data structures • Format of intermediate files • Details of algorithms used

  11. Implementation Language • To be implemented in its own language • Final version must be able to compile itself • So you define the implementation language as well as the language to be compiled.

  12. The Target Language • Generate MMIX assembly language • To be assembled and run on MMIX assembler

  13. Compiler Organization • Organize compiler as set of separate programs, e.g. parser, semantic analyzer, optimizer, code generator. • Programs communicate by means of files • Carefully define format of these files

  14. Bootstrapping • Some different methods • Write crude translator from Algol-68 subset to C (e.g. PERL script) • Write crude translator from C to Algol-68 • Write in Algol-68 and use some existing A68 compiler or translator

  15. What to Hand In • Commented source code • Set of sample programs used to test compiler, with output from MMIX run, and MMIX assembly language. • Standard class bench mark (to be supplied later) run on instrumented MMIX simulator.

  16. Due Date • Last Day of the Exam Period • Extensions possible • But not if you want to use grade to avoid exam!

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