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

David Holmes david.holmes at oracle.com
Tue Jun 19 23:30:23 UTC 2018 

Sorry another update is imminent ... stay tuned.

David

On 19/06/2018 2:41 PM, David Holmes wrote:
> Discussions on the CSR request have led to further changes to the 
> documentation involving nests and the new nest-related method. There are 
> no semantic changes here just clearer explanations.
> 
> Incremental webrev: 
> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v7-incr/
> 
> (don't worry if you don't see a v6, it didn't really exist).
> 
> Full webrev: 
> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.full.v7/
> 
> Specdiffs updated in place at: 
> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/specs/
> 
> Summary of changes:
> 
> - The definition of a nest etc is moved to the class-level javadoc of 
> java.lang.Class, along with some other edits provided by Alex Buckley to 
> pave the way for future updates
> - The nest-related methods are written in a more clear and consistent way
> 
> Thanks,
> David
> -----
> 
> On 12/06/2018 3:16 PM, David Holmes wrote:
>> Here is one further minor update from the CSR discussions:
>>
>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v5-incr/src/java.base/share/classes/java/lang/Class.java.cdiff.html 
>>
>>
>> Thanks,
>> David
>>
>> On 25/05/2018 3:52 PM, David Holmes wrote:
>>> Here are the further minor updates so far in response to all the 
>>> review comments.
>>>
>>> Incremental corelibs webrev:
>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v3-incr/ 
>>>
>>>
>>> Full corelibs webrev:
>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v3/
>>>
>>> Change summary:
>>>
>>> src/java.base/share/classes/jdk/internal/reflect/Reflection.java
>>> - remove inaccurate pseudo-assertion comment
>>>
>>> test/jdk/java/lang/reflect/Nestmates/SampleNest.java
>>> - code cleanup: <> operator
>>>
>>> test/jdk/java/lang/reflect/Nestmates/TestReflectionAPI.java
>>> - code cleanup: streamify duplicate removals
>>>
>>> test/jdk/java/lang/invoke/PrivateInterfaceCall.java
>>> - use consistent @bug number
>>>
>>> Thanks,
>>> David
>>>
>>> On 22/05/2018 8:15 PM, David Holmes wrote:
>>>> Here are the updates so far in response to all the review comments.
>>>>
>>>> Incremental webrev: 
>>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v2-incr/ 
>>>>
>>>>
>>>> Full webrev: 
>>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.v2/
>>>>
>>>> Change summary:
>>>>
>>>> src/java.base/share/classes/java/lang/Class.java
>>>> - getNesthost:
>>>>    - change "any error" -> "any linkage error" as runtime errors 
>>>> will propagate. [This needs ratifying by EG]
>>>>    - add clarification that primitive and array classes are not 
>>>> explicitly members of any nest and so form singleton nests
>>>>    - add clarification that all nestmates are in the same package
>>>>    - re-word @return text to exclude the "royal 'we'"
>>>> - fix javadoc cross references
>>>>
>>>> ---
>>>>
>>>> Moved reflection API tests from 
>>>> test/hotspot/jtreg/runtime/Nestmates/reflectionAPI/ to 
>>>> test/jdk/java/lang/reflect/Nestmates/
>>>>
>>>> ---
>>>>
>>>> java/lang/reflect/Nestmates/TestReflectionAPI.java
>>>>
>>>> Run tests twice to show that failure reasons remain the same.
>>>>
>>>> ---
>>>>
>>>> test/jdk/jdk/lambda/vm/InterfaceAccessFlagsTest.java
>>>>
>>>> Disable test via annotation rather than commenting out.
>>>>
>>>> ---
>>>>
>>>> src/java.base/share/classes/jdk/internal/reflect/Reflection.java
>>>>
>>>> - Fix indent for nestmate access check.
>>>> - Remove unnecessary local variable
>>>>
>>>> ---
>>>>
>>>> src/java.base/share/classes/sun/invoke/util/VerifyAccess.java
>>>>
>>>> - Replace myassert with proper assert
>>>>
>>>> ---
>>>>
>>>> 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 core-libs - webrev:
>>>>>
>>>>> http://cr.openjdk.java.net/~dholmes/8010319-JEP181/webrev.corelibs.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
>>>>>

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