Adobe have released the Flex SDK as open source. The trunk of the SDK repository contains the source to the ActionScript compiler and the GlobalOptimizer component that can be used for generating code used in Tamarin Tracing. To build the asc.jar required by Tamarin, first get a copy of the current source, change to the 'modules/asc/build/java/' directory and run 'ant' to build 'asc.jar':
$ svn checkout http://opensource.adobe.com/svn/opensource/flex/sdk/trunk flex-sdk $ cd flex-sdk/modules/asc/build/java $ ant clean main
The generated 'asc.jar' file will be in '/modules/asc/lib/asc.jar' and should be copied to the 'utils' directory of Tamarin Tracing to be picked up by the build tools.