On 30/11/2020 5:08 pm, Remi Forax wrote:
I've forgotten a cast in an invokedynamic, hence a call to wrongTargetType,
but in order to create the error message, MethodType.toString(),
getSimpleName() is called and it fails because getDeclaringClass() verifies the
InnerClasses attribute.
For me InnerClasses was just an attribute for javac not something the VM should
take care of,
it seems that the VM strongly verifies this attribute and i wonder what is the
reason behind that ?
From the VM code - InstanceKlass::compute_enclosing_class:
// Throws an exception if outer klass has not declared k as an inner
klass
// We need evidence that each klass knows about the other, or else
// the system could allow a spoof of an inner class to gain access
rights.
Reflection::check_for_inner_class(outer_klass, this,
*inner_is_member, CHECK_NULL);
David
regards,
Rémi
Exception in thread "main" java.lang.IncompatibleClassChangeError:
fr.umlv.transmogrif.ImplMap and fr.umlv.transmogrif.ImplMap$Row/0x0000000801007400
disagree on InnerClasses attribute
at java.base/java.lang.Class.getDeclaringClass0(Native Method)
at java.base/java.lang.Class.isTopLevelClass(Class.java:1970)
at java.base/java.lang.Class.getSimpleBinaryName(Class.java:1955)
at java.base/java.lang.Class.getSimpleName0(Class.java:1835)
at java.base/java.lang.Class.getSimpleName(Class.java:1826)
at java.base/java.lang.Class.getSimpleName0(Class.java:1833)
at java.base/java.lang.Class.getSimpleName(Class.java:1826)
at java.base/java.lang.invoke.MethodType.toString(MethodType.java:895)
at java.base/java.lang.String.valueOf(String.java:3365)
at java.base/java.lang.StringBuilder.append(StringBuilder.java:169)
at
java.base/java.lang.invoke.MethodHandle.standardString(MethodHandle.java:1611)
at
java.base/java.lang.invoke.MethodHandle.toString(MethodHandle.java:1608)
at java.base/java.lang.String.valueOf(String.java:3365)
at
java.base/java.lang.invoke.CallSite.wrongTargetType(CallSite.java:203)
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:333)
at
java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:280)
at
java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:270)
at
fr.umlv.transmogrif.ImplMap/0x0000000801003c00.<init>(ImplMap.java:21)
at fr.umlv.transmogrif.Main.main(Main.java:7)
