[10] RFR 8186046 Minimal ConstantDynamic support

Karen Kinnear karen.kinnear at oracle.com
Tue Nov 7 20:04:57 UTC 2017


Thank you for the explanations. Asking for your help in some test case construction at the end here:

>> 3. java/lang/invoke/package-info.java 128-134
>> Error handling could be clearer.
>> My understanding is that if a LinkageError or subclass is thrown, this will be rethrown
>> for all subsequent attempts. Other errors, e.g. VMError may retry resolution
I was WRONG here - this does match the JVMS. Apologies for the confusion.
>> 9. test/jdk/java/lang/invoke/common/test/java/lang/invoke/lib/InstructionHelper.java
>> How would I write an ldc CONSTANT_Dynamic which referred to a bootstrap method that
>> was not ACC_STATIC?
> https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.23 <https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.23>
> See the note under bootstrap_method_ref. The kind of method handle is constrained because of the arguments that are pushed on the stack before invocation. I believe it’s possible to have a constructor, but the declaring class would need to be a subtype of CallSite in the case of indy, and a subtype of the constant value type in the case of condy.
>> Or was not ACC_PUBLIC?
> That’s dependent on the accessibility between the lookup class the the BSM declaring class.
>> Or was 
>> Or did I read the invoke dynamic method incorrectly?
> By default, and for convenience, the InstructionHelper assumes the BSM is declared by the lookup class. I recently modified that to support the BSM being declared on another class, to test the minimal set of BSMs for condy (separate issue [1]). Note it’s always possible to use the bytecode API more directly.
> So we can easily add more -ve tests for non-accessible or non-static BSMs.
Thank you - that is what we were trying to do - test BSM declared in another class, test in-accessible
BSM and test non static method.

Could you help us figure out how to
1) invoke a constructor? 
2) invoke a virtual method? How do you pass the receiver? 


> Paul.
> [1] http://cr.openjdk.java.net/~psandoz/jdk10/JDK-8187742-condy-bootstraps/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk10/JDK-8187742-condy-bootstraps/webrev/>

More information about the core-libs-dev mailing list