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From Jochen Theodorou <>
Subject Re: Old bytecode targets
Date Wed, 05 Sep 2018 10:44:45 GMT

Am 05.09.2018 um 12:36 schrieb Remi Forax:
> it's not free if you ask ASM (COMPUTE_FRAMES) to do the fix point algorithm (which is
not linear) and to infer the common supertype, if you generate the StackFrames in the groovy
compiler by calling explicitly visitFrame, the runtime cost is not big (but you need to modify
your compiler backend which has development a cost).

we cannot let asm just do this 100% for us. The classes under 
compilation are possibly not available through classloading, and asm 
might not even use the right classloader if they would. what we do then 
is using COMPUTE_FRAMES, but override

protected String getCommonSuperClass(String arg1, String arg2)

which does a not 100% correct calculation of the common super class. 
(not 100% correct means here to claim it is Object in some cases, where 
there would be a better fit)

bye Jochen

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