RFR: Fix shark for latest Hotspot and LLVM (original) (raw)
Roman Kennke rkennke at redhat.com
Wed Nov 21 09:31:34 PST 2012
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Hi there,
during the last days I worked on fixing the Shark compiler for Hotspot to get it to build and run again, with the latest Hotspot code and LLVM. Here are some details:
- A lot of changes are just to make it build and the compiler happy. For example, I had to remove a lot of 'const' qualifiers because of API changes in LLVM.
- Most other changes have to do with the split of the oop and metadata class hierarchies in Hotspot.
- Then there have been a few changes caused by LLVM changes and improvements, most notably the LLVM intrinsics for atomic operations (memory barrier and cmpxchg) have been removed and now have a representation directly in LLVM's IR. This makes our code a little nicer.
I tested this by running a number of applications, most notably Eclipse (which is notoriously difficult on VMs), Java2Demo, SwingSet2 and a bunch of other stuff.
I would like to get this integrated into OpenJDK now if possible. You can find the full webrev here:
http://cr.openjdk.java.net/~rkennke/shark/webrev.00/
There are also a very minor change required in JDK:
http://cr.openjdk.java.net/~rkennke/shark/webrev-jdk-00/
In order to build it, apply the patches on hsx/hotspot-comp 's hotspot and jdk repositories respectivly. Find my build script here:
http://cr.openjdk.java.net/~rkennke/shark/Build8-zero-shark
(Review and adjust variables to your settings, most notably you will need to change LLVM_CONFIG to point to your LLVM 3.1 installation.)
Please let me know if there are any issues or how we can get this integrated into Hotspot.
Best regards, Roman
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