Bindings, Platforms, and Innovation
This presentation focuses on the Internet and separating myth from fact, history from the future, and the mundane from the imaginative. Bob Frankston presents a vision of what could and should be.
Tracking change and innovation in the enterprise software development community
Posted by R.J. Lorimer on Sep 01, 2008 03:54 PM
John Rose has announced 'International InvokeDynamic Day', in celebration of the first successful method invocation via the 'invokedynamic' instruction:In the wee hours of this morning, the JVM has for the first time processed a full bootstrap cycle forThe 'invokedynamic' instruction is one of many efforts planned as part of the multi-language virtual machine dubbed the 'Da Vinci Machine'. All of the planned feature enhancements in Da Vinci are described on the sub-project section of the MLVM site. Dynamic invocation is also part of JSR-292, which has been previously discussed on InfoQ, and is an adaptation of some of the experimental Da Vinci work into the core Java VM. This announcement by John Rose is the first time that 'invokedynamic' has run on the OpenJDK hotspot virtual machine.invokedynamicinstructions, linking the constant pool entries, creating the reified call site object, finding and calling the per-class bootstrap method, linking the reified call site to a method handle, and then calling the linked call site 999 more times through the method handle, at full speed. The method names mentioned by the caller and the callee were different, though the signatures were the same. The linkage was done by random, hand-written Java code inside the bootstrap method.
Awesome...and with JRuby 1.1.4 coming out today or tomorrow I'll beGuillaume Laforge, project manager of Groovy, had more simple words of celebration, writing:
taking an invokdynamic vacation. Just in time to demo it for the fall
conference season!
Champaign! :-)There is still a long road left for dynamic invocation, however. Of course, dynamic languages (such as JRuby and Groovy) must adapt to utilize the new instruction. Rose also details that there is still work to be done in the core implementation:
As for the JVM code, it only works on x86/32; the next step is to move the assembler code into the right files, and finish the support for x86/64 and SPARC.
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