Re: What's the precise definition of an "Internal Name"

1.a is the internal name, 1.b the descriptor.
2.a is both the internal name and the descriptor. The form 2.b is not used in .class files.

See https://docs.oracle.com/javase/specs/jvms/se10/html/jvms-4.html#jvms-4.4.1: "for such array classes, the name of the class is the descriptor of the array type" where "name" refers to the "name encoded in internal form" (from the "name_index" description).

> Hi,
> 
> 
> Sorry for bothering about this tiny matter, but answering these
> question would clear my queries:
> 
> 
> 1. which of these is the correct 'internal name' and which one is the
> correct 'type descriptor' for 'Object':
> 
> 
> a. java/lang/Object
> b. Ljava/lang/Object;
> 
> 
> 
> 
> 2. which of these is the correct 'internal name' and which one is the
> correct 'type descriptor' for an array of 'Object's:
> 
> 
> a. [Ljava/lang/Object;
> b. java/lang/Object[]
> 
> 
> 
> On Tue, May 22, 2018 at 8:34 PM Sagar Tewari < [email protected] >
> wrote:
> 
> 
> 
> The Type.getInternalName Method replaces dots with slashes in the
> output of Class.getName. It looks like the result of that would be a
> Field Descriptor . The table on this page, below the hierarchy
> diagram supports that.
> 
> 
> So does it mean that wherever the ASM library asks for an internal
> name to be passed, it actually expects a Field Descriptor (as
> defined by the jvm specs)?
> 
> 
> On Tue, May 22, 2018 at 3:10 PM Remi Forax < [email protected] >
> wrote:
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> De: "Sagar Tewari" < [email protected] >
> À: "asm" < [email protected] >
> Envoyé: Mardi 22 Mai 2018 09:05:51
> Objet: [asm] What's the precise definition of an "Internal Name"
> 
> 
> 
> 
> Hi,
> 
> 
> Hi
> 
> 
> 
> 
> 
> 
> 
> This test compares the output of
> 'Type.getInternalName(Object[].class)' to the string
> "[Ljava/lang/Object;", which is not an internal name as specified by
> the jvm specs . The correct internal name of 'Object[]' should be
> 'java/lang/Object[]', as it's binary name is 'java.lang.Object[]'(
> https://docs.oracle.com/javase/specs/jls/se10/html/jls-13.html#jls-13.1
> ), and the internal name equals binary name with '.'s replaced with
> '/'s. The implementation of this method just replaces '.'s with '/'s
> in the output of 'Class.getName'.
> 
> 
> I've always though that the section 4.1 was confusing, i believe it's
> because historically, prior to 1.5 i think, you were not able to use
> an array as an internal name, now you can do a ldc on an array or an
> invokevirtual clone().
> 
> 
> The section 5.1 is more precise of what is an internal name of an
> array
> 
> https://docs.oracle.com/javase/specs/jvms/se10/html/jvms-5.html#jvms-5.1
> 
> 
> 
> 
> 
> 
> 
> I suspect the reason to be difference in terminology used. Would
> appreciate if anyone could clarify the situation. Also, the method
> isn't used anywhere outside of tests.
> 
> 
> Type is a helper class, the ASM visitors API uses String to encode
> internal name (you can search for internal name on a ClassVisitor, a
> MethodVisitor, etc.
> 
> 
> 
> 
> 
> 
> 
> 
> --
> 
> 
> 
> Best Regards
> Sagar Tewari
> 
> 
> regards,
> 
> Rémi
> 
> 
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> 
> 
> --
> 
> 
> 
> Best Regards
> Sagar Tewari
> 
> 
> 
> --
> 
> 
> 
> Best Regards
> Sagar Tewari
> 
> 
> --
> You receive this message as a subscriber of the [email protected] mailing
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