RFR: 8004823: Add VM support for type annotation reflection

[Joel Borggrén-Franck]

Hi again,

I noticed that my editor replaced all tabs with spaces in 
make/bsd/makefiles/mapfile-vers-product

This was unintentional and I will fix this.

cheers
/Joel

On 12/17/2012 05:47 PM, Joel Borggrén-Franck wrote:
> Hi,
>
> Here is a webrev for adding VM support for type annotation reflection: http://cr.openjdk.java.net/~jfranck/8004823/webrev.v4/
>
> Type annotations are coming with JDK 8, the proposed language changes can be found from here: http://openjdk.java.net/projects/type-annotations/
>
> Since runtime visible type annotations probably won't  be that common I have tried to minimise overhead when there are no type annotations. This is done by adding a pointer to a type annotation Annotations instance from the regular annotations Annotations instance, see annotations.hpp. This means that if there are no runtime visible annotations there is no additional overhead with this patch since no Annotations instance will be allocated at all. If there is runtime visible annotations but no runtime visible type annotations there is an additional overhead of 1 pointer with this patch. If you use type annotations there will also be storage overhead, but that is to be expected.
>
> This patch also fixes  that Annotations were never deallocated when InstanceKlass::deallocate_contents() were called.
>
> There is currently no redefineClass support for type annotations. This will be added later. In order avoid ship possibly broken bytes to java-land, type annotations are nulled out and deallocated after a redefineClass.
>
> This patch also exports a new method from jvm.h, JVM_GetClassTypeAnnotations, so map files are updated. Build-dev are included for review.
>
> Testing done:
> - vm.quick.testlis both on b67 and on a jdk that is patched with the new fields to Field, Method and Constructor
> - jprt full forrest build
> - jdk_lang in both b67 and the patched jdk
> - manual tests that we get the correct bytes out from the VM. These tests can be added once some more changes have propagated from the jdk repo
>
> FYI, The initial set of jdk changes are being reviewed on core-libs-dev: http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-December/013016.html
>
> cheers
> /Joel
>