From MozillaWiki
Jump to: navigation, search

Pork is a set of tools built around the elsa C/C++ parser. The primary focus of pork is to provide automated refactoring (Gecko:DeCOMtamination) and static analysis tools for Mozilla2. Pork announcement.

To install the tools on your regular machine, follow Static Analysis/Installing the Oink Stack

Pork is a fork of oink. In the future pork should become a development branch for oink.

More info for pork can be found on Taras' blog.


  • GCC 3.4.x or older that can successfully build Mozilla. 64bit Ubuntu, 32bit RHEL/CentOS are known to work. 32bit Ubuntu/Debian feature a linker bug that prevents Mozilla from building with gcc 3.4.6. Note: Recent work on Pork's Elsa allows it to be used with GCC 4.2
  • MCPP is required for refactoring tools
  • SpiderMonkey is required by DeHydra
  • Bison and Flex
  • patchutils are recommended to manage manual and automatic patches
  • MQ extension for hg is recommended. Alternatively, quilt can be used instead.

Pork Tools

Pork is broken down into tools that focus on a specific tasks. The tools can rarely be combined and thus should be applied incrementally.

  • Prcheck is a static analysis tool which produces patches as output. It is useful for correcting bugs that resulting PRBool behaving more like an int than a C++ bool. Blog entry
  • Squash is now obsolete. It was primarily written to explore how elsa can be utilized to assist with Gecko:DeCOMtamination. Many rewriting strategies and patching code were first implemented in squash.
  • PorkVM is a CentOS virtual machine image with a presetup pork + moz checkout.
  • PorkBarrel is a multiplexer(ala make -j) for the pork tools. It can combine patch output for patch-producing tools and save per-file output for DeHydra. The repository also contains a frontend to do nightly runs of prcheck.

Differences from Mainstream

In addition to adding more oink tools, pork has some differences from Elsa and Elkhound.

  • Elkhound has been extended to provide end-of-node position information
  • Elsa mods:
    • Expression AST nodes were modified to include end-of-node info + associated bugfixes
    • Elsa has been extended to support MCPP's macro-undo(-K) mode. Additional APIs were added to convert post-preprocessing source coordinates into pre-preprocessing ones
    • Elsa has received bugfixes to work with recent GCC (4.2) headers