Aug 08

Meanwhile in a parallel universe

Someone else is developing their own app-specific rewrite tools. In this case app-specific refers to automating porting code from gtk2 to gtk3. The approach is similar in that patches are produced, but it doesn’t look like a patch aggregating tool is written yet. Instead of the elsa/mcpp magic sauce, clang is being used, so this is limited to C at the moment.

KDE folks are behind in automated code rewrites arms race, perhaps the trolls should try some pork to accelerate KDE3->4 transition 🙂

All kidding aside, it is awesome to see that less-manual-labour-through-compiler-assisted-refactoring approach is gaining mindshare.

Aug 08

This week in the Static Analysis Corner

New Static Analysis Toys

I have been catching up on my backlog of little bugs, here are some of the most notable ones.

Benjamin has been pushing the limits of what Dehydra can do for his DXR prototype which resulted in a couple of cool new features with one new feature breaking backwards compatibility. Sorry about that, it is for the greater good.

Dehydra now processes more declarations.

Dehydra uses JavaScript prototypes to distinguish between types and declarations.

Treehydra is now built by default when building with a plugin-enabled compiler.

Treehydra now exposes the C++ frontend’s verbose and as-close-as-gcc-gets-to-written-code syntax tree via process_cp_pre_genericize. Access to the early C++ AST should make it easier to automatically translate a certain class of C++ functions into JavaScript.

Coming soon: buildbot setup for Dehydra along with autobuilt debian packages.

Also, Benjamin’s GSoC student, Bo Yang, has been doing some awesome work making our static analysis toolchain work on mingw. In my mind, Bo sealed his awesomeness in not only getting Mozilla to build under mingw yet again, but also by fixing a couple of exciting compiler bugs on Win32.

Path to 1.0

For more information on these and other developments see the Dehydra 1.0 tracking bug.

I am not yet sure what the next release of Dehydra will be. My giant GTY patch to GCC is still awaiting review in a GCC developer’s inbox. Depending on whether that gets accepted I’ll continue releasing Dehydra 0.9.x with the current GCC patchset or delay a 1.0 release to work on getting the GCC plugin API reviewed and more or less finalized.

Plans for Near Future

I think I figured out the missing pieces needed to make outparamdel’s deCOMtamination patches acceptable, will work on that next. I’ll be continuing to clean up pork to be more developer-friendly. After the recent unhappyness involving bisection 10separate repositories at once, I’ve decided to merge pork into one giant repository and if someone just wants a couple smaller of pieces, those should be proken up at the package management level.

Additionally, I would like to start landing the SpiderMonkey analyses soon.

Aug 08

Oink testsuite within pork passes

I have never enjoyed the theory behind software engineering. It seems particularly depressing as it can be summarized as: “What can we learn from past software development experience in order to not repeat old mistakes such that we can come up with newer and shinier mistakes?”.

For that reason I haven’t been able to stick to any particular software development doctrine (paired, test-driven, OO, SOA, etc) and instead taken shortcuts to whatever is practical at the time.

One unfortunate result of such neglect is that the oink test suite ended up not being utilized. I tried it a couple of times while starting out with oink and it failed in many cumbersome ways. However, as pork evolved out of oink, I learned more about the “architecture” behind it, I fixed a couple of the issues that were causing funny make errors.

However one giant bug remained. Turned out other people were able to run the original oink testsuite, but not the equivalent one in pork. Fearing that I somehow screwed up Elsa, I spent way too long investigating the failure only to learn it wasn’t my fault. Pork users: rejoice, the testsuite should run as expected now.

PS. I may not be a SENG believer, but I do think that open source + good version control + testsuites result in better software.

Aug 08


The past week rocked. I was especially impressed with the localizers. The guys who bear through translating an entire browser with associated websites to expose their country to an awesome browsing experience are simply electrifying.

It was great to see the South American guys again and to meet hordes of Europeans.

The most exciting outcome of the summit in my neck of the static analysis woods is that DXR (a semantically aware successor to MXR) will be rewritten from scratch in Python. Another reason to rejoice is that a tracing spidermonkey should make Treehydra ridiculously fast without much (or any) effort on my part.