RFR(M): JDK-8165805 - [TESTBUG] CDS needs to support JVMTI CFLH - test development

serguei.spitsyn at oracle.com serguei.spitsyn at oracle.com
Thu Sep 15 03:47:40 UTC 2016


On 9/14/16 20:45, Jiangli Zhou wrote:
> Hi Misha,
>
>> On Sep 14, 2016, at 6:17 PM, Mikhailo Seledtsov <mikhailo.seledtsov at oracle.com> wrote:
>>
>> Hi Serguei,
>>
>> Thank you for second round of review. See my comments inline:
>>
>> On 9/14/16, 3:28 PM, serguei.spitsyn at oracle.com wrote:
>>> Hi Misha,
>>>
>>>
>>> Looks good in general.
>>>
>> Thank you.
>>> Few comments.
>>>
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/TransformInterfaceAndImplementor.java.html
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/TransformSuperAndSubClasses.java.html
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/TransformSuperSubTwoPckgs.java.html
>>>
>>>   Perhaps, the java.instrument must be added to the list of @modules.
>>>
>> OK, done.
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/myPkg1/SuperClazz.java.html
>>>
>>>   13         System.out.println("parent-transform-check: this-should-be-transformed");
>>>
>>>
>> This actually is a problem. Nothing that can not be solved, but as far as I know no simple solution for it.
>>
>> In summary, as far as I understand (and searched for it some, but correct me please if I am wrong): " It is a compile time error to import a type from the unnamed package."
>>
>> In detail:
>>   - traditionally all CDS tests (as many other hotpost JT-Reg tests) use default package. Not the best way, but it is what it is now.
>>   - the constants for "parent-transform-check" etc are defined in TransformUtil, which is assigned no package (hence it belongs to "default", or "unnamed" package).
>>   - most of tests using these constants also reside in "unnamed" package, so it works
>>   - however, this specific test requires for archived test classes to be in packages, as part of test scenario
>>   - AFAIK, it is not possible to import types from unnamed package into a named package
>>   - hence, I can not reference TransformUtil.ParentCheckPattern (and other pattern constants) from myPkg1.SuperClazz
>>
>> Well, given that, I can think of several solutions. Please let me know which one you prefer:
>>   - place TransformUtil in a package. Not sure how this will work out with all the tests dependent on this utility, I foresee some complications.
>>      Besides, there is a standing future plan to put JT-Reg tests in packages, which will have discussions on naming etc. Of course, I can pick a name for now, which we will   end up changing later.
>>
>>   - use reflection, something like:
>>      String parentCheckPattern = Class.forName("TransformUtil").getField(ParentCheckPattern)...
>>      Seems bit to complex for this case
>>   - leave it as is, and add a comment of where the constant is defined, and some explanation why it can not be accessed
> It doesn't seem worth using reflection in this case. I vote for leaving it as is.

Agreed.
It is better to leave it as it is - even no comments.
I'm against adding any kind of complexity.

Thanks,
Serguei


>
> Thanks,
> Jiangli
>
>>   - some other method I do not know about - suggestions welcome
>>
>> Let me know which one you'd like me to use.
>>>    Need to use the ParentCheckPattern and BeforePattern.
>>>
>>>
>>>
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/myPkg2/SubClass.java.html
>>>
>>>   18         System.out.println("child-transform-check: this-should-be-transformed");
>>>
>> Same as above.
>>>    Need to use the ChildCheckPattern and BeforePattern.
>>>
>>>
>>>
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/testlibrary/jvmti/TransformerAgent.java.html
>>>
>>>   68             int nrOfReplacements = TransformUtil.replace(buffer, "this-should-be-transformed", "this-has-been--transformed");
>>>
>> I can fix this.
>>>    Need to use the BeforePattern and AfterPattern.
>>>
>>>
>>> http://cr.openjdk.java.net/~mseledtsov/8165805.02/test/runtime/SharedArchiveFile/serviceability/transformRelatedClasses/TransformRelatedClasses.java.html
>>>
>>>   96         // Test Table
>>>   97         // testCaseId |  transformParent | tranformChild | isParentExpectedShared | isChildExpectedShared
>>>
>>>
>>>     For clarity, the comment above should list the test cases in the same order as they are executed below.
>>>     It seems, the test cases listed in the comment above do not match the test cases below.
>>>     I see just 4 test cases below, not 5 as listed above. Perhaps, the testCaseId above is not a test case?
>>>     Also, the base case below is not listed in the comment above.
>>>
>>>
>> Sorry if the comment is a bit confusing. The keywords delimited by the vertical line are supposed to list the columns of the test table. Kind of like a table header.
>> Not the list of the test cases.
>>
>> If you find it too confusing, please let me know - I will delete the comment altogether.
>>>   98         ArrayList<TestEntry> testTable = new ArrayList<>();
>>>   99
>>> 100         // base case - no tranformation - all expected to be shared
>>> 101         testTable.add(new TestEntry(0, false, false, true, true));
>>> 102
>>> 103         // transform parent only - both parent and child should not be shared
>>> 104         testTable.add(new TestEntry(1, true, false, false, false));
>>> 105
>>> 106         // transform parent and child - both parent and child should not be shared
>>> 107         testTable.add(new TestEntry(2, true, true, false, false));
>>> 108
>>> 109         // transform child only - parent should still be shared, but not child
>>> 110         testTable.add(new TestEntry(3, false, true, true, false));
>>> 111
>>> 112         // run the tests
>>> 113         for (TestEntry entry : testTable) {
>>> 114             test.runTest(entry);
>>> 115         }
>>>
>>>    Nit:
>>>      Not sure why the testTable is needed as it could be simplified as below:
>>>
>>>           // base case - no tranformation - all expected to be shared
>>>           test.runTest(new TestEntry(0, false, false, true, true));
>>>             // transform parent only - both parent and child should not be shared
>>>           test.runTest(new TestEntry(1, true, false, false, false));
>>>             // transform parent and child - both parent and child should not be shared
>>>           test.runTest(new TestEntry(2, true, true, false, false));
>>>             // transform child only - parent should still be shared, but not child
>>>           test.runTest(new TestEntry(3, false, true, true, false));
>>>
>> This is a pattern of data-driven testing. Just a matter of style in my opinion. The pattern is: fill out the table first, and then execute the tests based on the table.
>> It is not strictly necessary here, but there are some cases where tables are much bigger, and can be passed from somewhere else ("test definer") to the "test executor".
>> I would prefer to keep it, unless you have strong objection on this. We may expand these test cases in the future.
>>
>>
>>
>> Let me know what is your opinion on my questions/comments above. Once I have the answers, I will make the updates and post next webrev.
>>
>> Thank you,
>> Misha
>>> Thanks,
>>> Serguei
>>>
>>>
>>>
>>>
>>> On 9/13/16 22:08, Mikhailo Seledtsov wrote:
>>>> Thank you again for review. I have implemented all the review recommendations.
>>>> The update also contains new test case from Jiangli to test super/sub class pair, where super and sub classes belong to different packages.
>>>> Thank you Jiangli for the test case.
>>>>
>>>> Here is an updated webrev: http://cr.openjdk.java.net/~mseledtsov/8165805.02/
>>>>
>>>> Thank you,
>>>> Misha
>>>>
>>>> On 9/9/16, 7:31 PM, Mikhailo Seledtsov wrote:
>>>>>     Please review the tests that accompany the changes for
>>>>>     "JDK-8078644 - CDS needs to support JVMTI CFLH"
>>>>>
>>>>>     The tests include several test cases that are produced by combination
>>>>>     of transforming related classes: super/sub class and interface/implementor.
>>>>>     The classes reside in CDS archive. Tests check to ensure that correct
>>>>>     transformation is performed, classes are loaded from the archive only when appropriate,
>>>>>     and that test process using the archive completes w/o errors/crashes.
>>>>>
>>>>>
>>>>>     Details:
>>>>>
>>>>>     The main class is TransformRelatedClasses.java; start review with this class.
>>>>>     Other classes are:
>>>>>       - TransformSuperAndSubClasses.java, TransformInterfaceAndImplementor.java
>>>>>         the "actual tests", but really just test headers calling into TransformRelatedClasses.java
>>>>>
>>>>>       - TransformTestCommon.java - common methods for transformation tests
>>>>>
>>>>>       - TestEntry.java - an entry into combinatorial test table representing a single test case
>>>>>
>>>>>       - CDSTestUtils.java, TransformUtil.java - utility classes that are common  CDS
>>>>>         tests
>>>>>
>>>>>       - TransformerAgent.java - agent that performs transformation (comes with .mf file)
>>>>>
>>>>>
>>>>>     JBS: https://bugs.openjdk.java.net/browse/JDK-8165805
>>>>>     Webrev: http://cr.openjdk.java.net/~mseledtsov/8165805.00/
>>>>>     Testing:
>>>>>         Ran these tests on a standard set of platforms thru automated test system.
>>>>>
>>>>> Thank you,
>>>>> Misha
>>>>>



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