signatures for public properties

[Steve Hannah]

I have a macro that is using method/property signatures to generate appropriate functionality.  I have a section of code like:

if method.kind_of? Member

          signature = Member(method).signature

          if signature 

            puts "Reading signature #{signature} for #{method.name}"

            reader = SignatureReader.new(signature.toString)

            visitor = BaseSignatureVisitor.new(1)

            reader.accept visitor

            signatureStruct = visitor.getParameters

          else

            puts "#{method.name} has no signature"

          end

          

        else

          puts "Method #{method.name} is of type #{method.getClass}"

          nil

        end

(In this example member is of type JVMMethod, and it may be a public property or getter method).  

With public properties Member(method).signature is always nil.  I haven't checked the actual bytecode to see if this is because of javac's output (i.e. the signature is actually retrievable) or if Mirah just isn't pulling this in.

Is there any way to pull in the signature for public properties?

Thanks for any pointers.

Best regards

Steve

--

Steve Hannah

Web Lite Solutions Corp.

[Nick Howard]

Hmm. Oh, I think I might know why that is: 

https://github.com/mirah/mirah/blob/7a4704857daeb3e0d2da704f5e82e5c047f2b7d1/src/org/mirah/jvm/mirrors/member.mirah#L47

signature is attr_accessor'd, but as far as I can tell, never written to, which is pretty weird. There's definitely logic that check's its value--probably all that is bugs.

I'm not sure, but I think that in the mirror compiler Member is just used for intrinsics / methods that you can't make direct literal mappings for eg <init>.

There's still quite a bit of code in the mirror type system I don't get.

That said, are you trying to interact with public fields of Java classes, or are you trying to create public fields in Mirah? If it's Java classes, I think you'll find that you'll want to look for bytecode mirrors, and not members.

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-Nick Howard
http://blog.baroquebobcat.com/

[Steve Hannah]

On Thu, Feb 26, 2015 at 9:35 AM, Nick Howard <n...@baroquebobcat.com> wrote:

Hmm. Oh, I think I might know why that is: 

https://github.com/mirah/mirah/blob/7a4704857daeb3e0d2da704f5e82e5c047f2b7d1/src/org/mirah/jvm/mirrors/member.mirah#L47

signature is attr_accessor'd, but as far as I can tell, never written to, which is pretty weird. There's definitely logic that check's its value--probably all that is bugs.

Thanks.  I think I found the issue.  I have created a pull request

https://github.com/mirah/mirah/pull/283

Best regards

Steve