FUDCon 2009 DXR Talk

Introduction

“We’re able to use most of its features--there are too many of them. It’s probably got a better type system than Java. But we’re still screwing around with ‘70s debuggers and linkers, and it’s stupid. I don’t know why we put up with it.” --Mozilla CTO, Brendan Eich

“I'd rather eat glass.” --Mozilla Engineer, Graydon Hoare

“Adding more people to a late project only makes it later” --Fred Brooks

Mozilla Tools

• Mozilla Static Analysis Tools Overview
  • https://developer.mozilla.org/en/Dehydra
  • https://developer.mozilla.org/en/Treehydra
  • https://developer.mozilla.org/en/JSHydra
  • https://developer.mozilla.org/en/Pork
  • Taras Glek (Mozilla Corporation) Blog: http://blog.mozilla.com/tglek

Examples

• Web Based Dehydra, JSHydra
• 27,000 line patch written automatically
• Sample Dehydra Script
• Ehren Metcalfe's GCC/Treehydra Mozilla optimization

LXR, MXR and the Need for Semantic Data

• http://blog.mozilla.com/dmandelin/2008/03/03/mxr-your-dehydra/
• http://mxr.mozilla.org/firefox/source/accessible/src/html/nsHTMLImageAccessible.cpp#208
• http://mxr.mozilla.org/firefox/ident?i=SetParent

DXR

• http://scotland.proximity.on.ca/dxr/
• Same SetParent call, now in DXR
• Looking-up nsAccessible::SetParent
• Callers for nsAccessible::SetParent
• Figuring out who implements the nsIAccessible::SetParent interface
• Examining the nsIAccessible type
• Examining value of NS_ENSURE_SUCCESS macro