RFR(XS): 8187669: [MVT] ValueTypeHolder::unreflectWithers fails with ClassFormatError: Illegal method name

Lois Foltan lois.foltan at oracle.com
Tue Sep 19 15:23:52 UTC 2017


On 9/19/2017 7:52 AM, Tobias Hartmann wrote:
> Hi,
>
> I noticed that initialization of 
> test/compiler/valhalla/valuetypes/ValueCapableClass2.java fails with 
> "ClassFormatError: Illegal method name 
> "compiler.valhalla.valuetypes.ValueCapableClass2_unreflectWithers"" if 
> the verifier is enabled.
>
> The problem is that ValueCapableClass2 is declared in a package and 
> ValueTypeHolder::getOrLoad uses sourceClass().getName() for the method 
> name which contains the package path.

Hi Tobias,

Test hotspot/test/runtime/valhalla/valuetypes/ValueOops.java is hitting 
this issue as well and I was unable to remove the "-noverify" option for 
it.  I entered a bug suggesting that the fully qualified binary name 
should be translated from '.' to '/' before reaching the JVM.    See 
bug, https://bugs.openjdk.java.net/browse/JDK-8186874.  Due to JVM 
access checks that now involve checks for readability/exportability of a 
module & package a class is defined to, I suspect that it is important 
for the JVM to have the fully qualified name and not the simple name.

Thanks,
Lois

>
> We should use "getSimpleName":
>
> --- a/src/java.base/share/classes/valhalla/shady/ValueTypeHolder.java 
> Fri Sep 15 13:49:03 2017 -0700
> +++ b/src/java.base/share/classes/valhalla/shady/ValueTypeHolder.java 
> Tue Sep 19 13:51:32 2017 +0200
> @@ -495,7 +495,7 @@
>      private MethodHandle getOrLoad(Lookup lookup, ValueHandleKey key, 
> Supplier<MethodType> typeSupplier, Consumer<? super 
> MethodHandleCodeBuilder<?>> codeBuilder) {
>          MethodHandle result = handleMap.get(key);
>          if (result == null) {
> -            String handleDebugName = sourceClass().getName() + "_" + 
> key.kind.handleName();
> +            String handleDebugName = sourceClass().getSimpleName() + 
> "_" + key.kind.handleName();
>              result = MethodHandleBuilder.loadCode(lookup, 
> handleDebugName, typeSupplier.get(), codeBuilder);
>              handleMap.put(key, result);
>          }
>
> Thanks,
> Tobias



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