Peephole Template

An introduction to the basics of peephole optimization using Java Bytecode and JOOS.

Directory Structure

JOOS

• JOOSA-src/: Source code for the A+ JOOS compiler (excluding the A+ patterns). It is thus more complete than the A- compiler distributed previously. For example, it supports for loops, increment expressions, and proper computation of stack height
  • patterns.h: Source file containing all your patterns for this assignment. We have included a few sample patterns to get you started, but you should add many more!
• JOOSexterns/: The .joos files that define the external signatures. They are included by the scripts
• JOOSlib/: The .java files that serve as interfaces to Java functionality
• jasmin.jar: A copy of jasmin, used by the joosc.sh script
• jooslib.jar: A copy of the JOOS library
• joos.sh: Script that calls the joos compiler in JOOSA-src/ directory. It produces one .j file for each input .java file
• joosc.sh: Script that calls the joos compiler to generate the .j files and then calls jasmin to generate the .class files. You should be able to run those .class files with any Java system

Convenience

• PeepholeBenchmarks/: There are 6 benchmarks in this directory that you can use for testing your optimizations. Each benchmark contains a Makefile that you can use to compile. Optimizations are applied when invoking make opt. Note that you must set the $PEEPDIR environment variable to directly invoke the Makefile
• count.sh: Script that compiles all benchmarks with/without optimization and reports the bytecode size in both cases. This will likely be the sole command you run to compile and test