Project for CSC 255/455, Spring 2009

Introduction

In the project, you will add your own optimization passes in the Gnu C Compiler, GCC 4.2.2. It is not the most recent GCC, but should be sufficient for our project. You have to know the basic framework of GCC and how to manipulate the intermediate form, the gimple tree, for program analysis and transformation. This page includes many suggestions that will help you in the process. Please read the entire page and the pages about source browsing and debugging before you start.

Compilation, Installation and Run

  • Check out the code by using subversion, and install.
        mkdir gcc
        cd gcc
        svn co file:///p/compiler/repos/gcc-4.2.2/trunk gcc-4.2.2
           // if outside the firewall, use
           // svn co svn+ssh://usr_id@server_name.cs.rochester.edu/p/compiler/repos/gcc-4.2.2/trunk gcc-4.2.2
        mkdir obj
        cd obj
        ../gcc-4.2.2/configure --prefix=$INSTALL_DIR
          // $INSTALL_DIR is the directory you want to install your compiler
        make
        make install
  • For those who have no access to department research network, please download gcc-4.2.2.tar.bz2 and unzip it with the command tar -jxvf gcc-4.2.2.tar.bz2. There is also a copy on undergrad network at /home/hoover/u1/cs255/.
  • Use either our desktop or personal machine or one of the public use machines in the CS department. When using department machines, due to the shortage of space for the /home directory, it is better to put your code under /localdisk .
  • Invoke your pass: use -O2 -fcs255
  • Output gimple tree in c-like form: use option -fdump-tree-gimple
  • Output gimple tree in c-like form after the pass for cs255: use option -fdump-cs255-tree-gimple
  • Put your own code into gcc-4.2.2/gcc/cs255.c
  • Use make for your testing: see An Example for Makefile
  • How to turn in your code: see Turn in for cs255

Browsing GCC code

  • Gnu's wiki page on GCC getting started.
    • You can open in a web browser the following file /p/compiler/built/gcc-4.2.2/doxygen/ and start with index.html for a local copy of Gcc 4.2.2 documentation by doxygen. If you copy, the directory needs about 600MB disk space.
    • Installing and using Doxygen to generate your own documentation
    • Good Assorted Topics Page from developer site also has a decent overview.
  • Using Emacs (especially useful when you work remotely)
  • Using Eclipse (w/ CDT). You can download Eclipse IDE for C/C++ Developers (68 MB) from here.

Debugging

GCC Data Structures and Internal Representations

* Set ALLOWTOPICCHANGE = ChenDing, BinBao

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Topic revision: r11 - 2009-01-27 - BinBao
 
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