RFR: 8266330: itableMethodEntry::initialize() asserts with archived old classes

Coleen Phillimore coleenp at openjdk.java.net
Sat May 8 13:03:17 UTC 2021


On Fri, 7 May 2021 22:32:33 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> #ifdef ASSERT 
>   if (MetaspaceShared::is_in_shared_metaspace((void*)&_method) && 
>      !MetaspaceShared::remapped_readwrite() && 
>      !MetaspaceShared::is_old_class(m->method_holder())) { 
>     // At runtime initialize_itable is rerun as part of link_class_impl() 
>     // for a shared class loaded by the non-boot loader. 
>     // The dumptime itable method entry should be the same as the runtime entry. 
>     assert(_method == m, "sanity"); 
>   } 
> #endif
> 
> 
> The above includes the check for !MetaspaceShared::is_old_class(m->method_holder()).
> While the method_holder() is not an old class, the _klass in the klassITable could be an old class.
> The proposed fix is to have the caller of the above function pass in the _klass and add another check
> making sure the _klass is not an old class before the assert.
> 
> Testing:
> - [x] tiers 1 and 2 (including the new test)

Hi, the concept of 'old' class conflicts with the concept of 'old' methods which were ones that were redefined.  I looked at this to see how redefinition could have broken this. One of these should change their name.
In a future RFE, can you rename is_old_class to has_old_class_version(klass) ?

-------------

PR: https://git.openjdk.java.net/jdk/pull/3930


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