[langtools] RFR (L): 8010319: Implementation of JEP 181: Nest-Based Access Control

[David Holmes]

Thanks Maurizio!

David

On 7/06/2018 9:42 PM, Maurizio Cimadamore wrote:
> Looks good
> 
> Thanks David
> 
> Maurizio
> 
> 
> On 07/06/18 11:02, David Holmes wrote:
>> Hi compiler-team,
>>
>> Was just getting ready to push this when I discovered a newly added 
>> test doesn't pass under nestmates:
>>
>> tools/javac/classfiles/attributes/Synthetic/AccessToPrivateInnerClassConstructorsTest.java 
>>
>>
>> webrev: 
>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.langtools.v5-incr/ 
>>
>>
>> Fix was to reduce expected number of synthetic methods from 2 to 0, 
>> and expected number of synthetic classes from 1 to 0. This is similar 
>> to a previous change:
>>
>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.langtools.v1/test/langtools/tools/javac/classfiles/attributes/Synthetic/AccessToPrivateInnerClassMembersTest.java.cdiff.html 
>>
>>
>> Thanks,
>> David
>>
>> On 15/05/2018 10:52 AM, David Holmes wrote:
>>> This review is being spread across four groups: langtools, core-libs, 
>>> hotspot and serviceability. This is the specific review thread for 
>>> langtools - webrev:
>>>
>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.langtools.v1/
>>>
>>> See below for full details - including annotated full webrev guiding 
>>> the review.
>>>
>>> The intent is to have JEP-181 targeted and integrated by the end of 
>>> this month.
>>>
>>> Thanks,
>>> David
>>> -----
>>>
>>> The nestmates project (JEP-181) introduces new classfile attributes 
>>> to identify classes and interfaces in the same nest, so that the VM 
>>> can perform access control based on those attributes and so allow 
>>> direct private access between nestmates without requiring javac to 
>>> generate synthetic accessor methods. These access control changes 
>>> also extend to core reflection and the MethodHandle.Lookup contexts.
>>>
>>> Direct private calls between nestmates requires a more general 
>>> calling context than is permitted by invokespecial, and so the JVMS 
>>> is updated to allow, and javac updated to use, invokevirtual and 
>>> invokeinterface for private class and interface method calls 
>>> respectively. These changed semantics also extend to MethodHandle 
>>> findXXX operations.
>>>
>>> At this time we are only concerned with static nest definitions, 
>>> which map to a top-level class/interface as the nest-host and all its 
>>> nested types as nest-members.
>>>
>>> Please see the JEP for further details.
>>>
>>> JEP: https://bugs.openjdk.java.net/browse/JDK-8046171
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8010319
>>> CSR: https://bugs.openjdk.java.net/browse/JDK-8197445
>>>
>>> All of the specification changes have been previously been worked out 
>>> by the Valhalla Project Expert Group, and the implementation reviewed 
>>> by the various contributors and discussed on the valhalla-dev mailing 
>>> list.
>>>
>>> Acknowledgments and contributions: Alex Buckley, Maurizio Cimadamore, 
>>> Mandy Chung, Tobias Hartmann, Vladimir Ivanov, Karen Kinnear, 
>>> Vladimir Kozlov, John Rose, Dan Smith, Serguei Spitsyn, Kumar Srinivasan
>>>
>>> Master webrev of all changes:
>>>
>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.full.v1/
>>>
>>> Annotated master webrev index:
>>>
>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/jep181-webrev.html
>>>
>>> Performance: this is expected to be performance neutral in a general 
>>> sense. Benchmarking and performance runs are about to start.
>>>
>>> Testing Discussion:
>>> ------------------
>>>
>>> The testing for nestmates can be broken into four main groups:
>>>
>>> -  New tests specifically related to nestmates and currently in the 
>>> runtime/Nestmates directory
>>>
>>> - New tests to complement existing tests by adding in testcases not 
>>> previously expressible.
>>>    -  For example java/lang/invoke/SpecialInterfaceCall.java tests 
>>> use of invokespecial for private interface methods and performing 
>>> receiver typechecks, so we add 
>>> java/lang/invoke/PrivateInterfaceCall.java to do similar tests for 
>>> invokeinterface.
>>>
>>> -  New JVM TI tests to verify the spec changes related to nest 
>>> attributes.
>>>
>>> -  Existing tests significantly affected by the nestmates changes, 
>>> primarily:
>>>     -  runtime/SelectionResolution
>>>
>>>     In most cases the nestmate changes makes certain invocations that 
>>> were illegal, legal (e.g. not requiring invokespecial to invoke 
>>> private interface methods; allowing access to private members via 
>>> reflection/Methodhandles that were previously not allowed).
>>>
>>> - Existing tests incidentally affected by the nestmate changes
>>>
>>>    This includes tests of things utilising class 
>>> redefinition/retransformation to alter nested types but which 
>>> unintentionally alter nest relationships (which is not permitted).
>>>
>>> There are still a number of tests problem-listed with issues filed 
>>> against them to have them adapted to work with nestmates. Some of 
>>> these are intended to be addressed in the short-term, while some 
>>> (such as the runtime/SelectionResolution test changes) may not 
>>> eventuate.
>>>
>>> - https://bugs.openjdk.java.net/browse/JDK-8203033
>>> - https://bugs.openjdk.java.net/browse/JDK-8199450
>>> - https://bugs.openjdk.java.net/browse/JDK-8196855
>>> - https://bugs.openjdk.java.net/browse/JDK-8194857
>>> - https://bugs.openjdk.java.net/browse/JDK-8187655
>>>
>>> There is also further test work still to be completed (the JNI and 
>>> JDI invocation tests):
>>> - https://bugs.openjdk.java.net/browse/JDK-8191117
>>> which will continue in parallel with the main RFR.
>>>
>>> Pre-integration Testing:
>>>   - General:
>>>      - Mach5: hs/jdk tier1,2
>>>      - Mach5: hs-nightly (tiers 1 -3)
>>>   - Targetted
>>>     - nashorn (for asm changes)
>>>     - hotspot: runtime/*
>>>                serviceability/*
>>>                compiler/*
>>>                vmTestbase/*
>>>     - jdk: java/lang/invoke/*
>>>            java/lang/reflect/*
>>>            java/lang/instrument/*
>>>            java/lang/Class/*
>>>            java/lang/management/*
>>>    - langtools: tools/javac
>>>                 tools/javap
>>>
>