RFR: JEP 359: Records (Preview) (full code)

David Holmes david.holmes at oracle.com
Tue Dec 3 00:36:35 UTC 2019

Hi Vicente,

I have also re-examined all the hotspot related code and everything 
looks fine - and very neat (kudos to you and Harold!).

A couple of nits:



+ //    u2 attributs_count;



You are using CHECK_0 in RecordComponent::create but that method returns 
oop. That seems wrong to me, but I see many other oop returning methods 
also use CHECK_0 so I'll take that up separately. (It's only a cosmetic 



27 // This test is an Record marked as abstract.




On 28/11/2019 2:37 pm, Vicente Romero wrote:
> Hi,
> Please review the code for the records feature at [1]. This webrev 
> includes all: APIs, runtime, compiler, serialization, javadoc, and more! 
> Must of the code has been reviewed but there have been some changes 
> since reviewers saw it. Also this is the first time an integral webrev 
> is sent out for review. Last changes on top of my mind since last review 
> iterations:
> On the compiler implementation:
> - it has been adapted to the last version of the language spec [2], as a 
> reference the JVM spec is at [3]. This implied some changes in 
> determining if a user defined constructor is the canonical or not. Now 
> if a constructor is override-equivalent to a signature derived from the 
> record components, then it is considered the canonical constructor. And 
> any canonical constructor should satisfy a set of restrictions, see 
> section 8.10.4 Record Constructor Declarations of the specification.
> - It was also added a check to make sure that accessors are not generic.
> - And that the canonical constructor, if user defined, is not explicitly 
> invoking any other constructor.
> - The list of forbidden record component names has also been updated.
> - new error messages have been added
> APIs:
> - there have been some API editing in java.lang.Record, 
> java.lang.runtime.ObjectMethods and java.lang.reflect.RecordComponent, 
> java.io.ObjectInputStream, javax.lang.model (some visitors were added)
> On the JVM implementation:
> - some logging capabilities have been added to classFileParser.cpp to 
> provide the reason for which the Record attribute has been ignored
> Reflection:
> - there are several new changes to the implementation of 
> java.lang.reflect.RecordComponent apart from the spec changes mentioned 
> before.
> bug fixes in
> - compiler
> - serialization,
> - JVM, etc
> As a reference the last iteration of the previous reviews can be found 
> at [4] under folders: compiler, hotspot_runtime, javadoc, reflection and 
> serialization,
> TIA,
> Vicente
> [1] http://cr.openjdk.java.net/~vromero/records.review/all_code/webrev.00/
> [2] 
> http://cr.openjdk.java.net/~gbierman/jep359/jep359-20191125/specs/records-jls.html 
> [3] 
> http://cr.openjdk.java.net/~gbierman/jep359/jep359-20191125/specs/records-jvms.html 
> [4] http://cr.openjdk.java.net/~vromero/records.review/

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