So you want to build a compiler for Flash? some links to explore.

[1] <http://en.wikipedia.org/wiki/Tamarin_(JIT)>
[2] <http://labs.adobe.com/technologies/flex/sdk/>
[3] <http://haxe.org/>
[4] <http://weblogs.mozillazine.org/roadmap/archives/2007/07/new_projects.html>
[5] <http://haxe.org/hxasm>
[6] <http://swfmill.org/trac/browser/trunk/src/codegen/source.xml> (1483ff)