[Fwd: Request for review (S): CR 6889740 - G1: OpenDS fails with "unhandled exception in compiled code"]
john cuthbertson - Sun Microsystems
John.Cuthbertson at Sun.COM
Tue Oct 27 15:10:23 PDT 2009
I should have included the compiler alias on the attached review
request. Can someone look over the changes?
-------- Original Message --------
Subject: Request for review (S): CR 6889740 - G1: OpenDS fails with
"unhandled exception in compiled code"
Date: Tue, 27 Oct 2009 14:51:46 -0700
From: john cuthbertson - Sun Microsystems <John.Cuthbertson at Sun.COM>
To: hotspot-gc-dev at openjdk.java.net
Can I have a couple of volunteers to review the proposed fix for this
bug? The webrev can be found at
The issue is that bad code was being generated for the store operation
in the null case of the aastore bytecode template. The bad code was
caused by there being only one version of the store_heap_oop routine
that took a Register as the second argument. When the calling code
passed in NULL_WORD (0) to this routine the value was used as a Register
encoding and converted to Register(0), which is rax. Thus the generated
store was "mov (dst), $rax" instead of "mov (dst), $0x0". This is
normally not a problem as the preceding code in the template fetches the
value to be stored into rax. When the G1 pre-barrier code calls the
runtime, however, the value in rax can be overwritten and the heap can
Testing: OpenDS, jprt, refworkload, and the GC test suite.
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