RFR: JDK-8080511 - Refresh of jimage support

[deven you]

Hi Jim,

I have one question. I see Hotspot already supports in decompressing
compressed resource and there is a method newCompressedResource in
jdk/src/java.base/share/classes/jdk/internal/jimage/ResourcePool.java
 for creating a compressed resource but I did not find any API uses this
method and not find there is any compressed resource in bootmodules.jimage.

What I want to know is 1. if I want to compress one resource in a certain
module what are the steps?  I assume I need write some code which first
gets the plugin and compressed buffer and then pass to
newCompressedResource? If there is some compressed zip or jar files in a
certain module how the relevant code deals with this condition?
                                  2. Any plan that bootmodules.jiamge or
other jimage files will contain such compressed resources?

Thanks a lot!

2015-06-18 8:08 GMT+08:00 Jim Laskey (Oracle) <james.laskey at oracle.com>:

> https://bugs.openjdk.java.net/browse/JDK-8080511
>
> This is an long overdue refresh of the jimage support in the JDK9-dev
> repo.  This includes native support for reading jimage files, improved
> jrt-fs (java runtime file system) support for retrieving modules and
> packages from the runtime, and improved performance for langtools in the
> presence of jrt-fs.
>
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-top <
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-top>
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-jdk <
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-jdk>
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-hotspot <
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-hotspot>
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-langtools <
> http://cr.openjdk.java.net/~jlaskey/hs-rt-jimage/webrev-langtools>
>
>
> Details:
>
> - jrt-fs provides access, via the nio FileSystem API, to the classes in a
> .jimage file, organized by module or by package.
> - Shared code for jimage support converted to native.  Currently residing
> in hotspot, but will migrate to it’s own jdk library
> https://bugs.openjdk.java.net/browse/JDK-8087181 <
> https://bugs.openjdk.java.net/browse/JDK-8087181>
> - A new archive abstraction for class/resource sources.
> - java based implementation layer for jimage reading to allow backport to
> JDK8 (jrt-fs.jar - IDE support.)
> - JNI support for jimage into hotspot.
> - White box tests written to exercise native jimage support.
>
>