Any bytecode containing CONSTANT_Dynamic?

[Vicente Romero]

On 06/08/2018 06:39 AM, Remi Forax wrote:
>
> ------------------------------------------------------------------------
>
>     *De: *"Ess Kay" <s.2016.kay at gmail.com>
>     *À: *"compiler-dev" <compiler-dev at openjdk.java.net>
>     *Envoyé: *Vendredi 8 Juin 2018 02:13:10
>     *Objet: *Any bytecode containing CONSTANT_Dynamic?
>
>     We are needing to test our applications ability to correctly
>     handle the new |CONSTANT_Dynamic| constant pool entry.  Is there
>     any Java source code available anywhere that would result in the
>     Java 11 javac generating bytecode containing |CONSTANT_Dynamic|
>     pool entries?
>
>
> Constant lambdas are translated into constant dynamic at least by the 
> javac of Amber, but i do not know if the javac of the jdk11 does that too.

right you can clone the repo at [3] and move to the condy-folding 
branch. Once you build it you will have a JDK that is able to generate 
condy for non-capturing lambdas, also for lambdas that only capture 
constants:

Runnable r = () -> {}

--------------------------------

String prefix = "__";
Function <String, String> s -> prefix + s;

etc

Thanks,
Vicente

>
> Otherwise, if you look for classes containing constant dynamic, we use 
> this class [1] that was generated using the javac of Amber when 
> testing ASM.
> If you want a more complex example, you can play with cplisp which 
> encode lisp atoms into the constant pool using constant dynamic [2].
>
> regards,
> Rémi
>
> [1] 
> https://gitlab.ow2.org/asm/asm/blob/master/asm-test/src/main/resources/jdk11/LambdaCondy.class
> [2] https://github.com/forax/cplisp/blob/master/.travis.yml
>
[3] http://hg.openjdk.java.net/amber/amber
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