Request for review 8005075: CDS archive with one alignment causes crash when run with different alignment

harold seigel harold.seigel at
Mon Dec 17 07:23:59 PST 2012

Please review the following change to fix bug 8005075.

Summary:  This change prevents a crash when a CDS archive is created 
with a value for -XX:+ObjectAlignmentInBytes that is smaller than the 
ObjectAlignmentInBytes value used when running with -Xshare:on.  This 
fix stores the ObjectAlignmentInBytes in the CDS archive so that when 
the archive is read, hotspot can compare the archive's alignment with 
the current alignment and issue the following diagnostic if the 
archive's alignment is too small:

    An error has occurred while processing the shared archive file.
    The shared archive file was created with a smaller Object Alignment

This webrev also cleans up some text in globals.hpp and fixes a small 
problem with -XX:SharedReadOnlySize.  The existing code was always 
setting SharedReadOnlySize to 14M regardless of what was requested.  
This prevented users from being able to expand the CDS archive's 
SharedReadOnly section.

Open webrev at 

Bug link at

The changes were tested with JCK, JPRT, JTREG, and UTE tests, and with 
hand-run tests using different ObjectAlignmentInBytes values.

Thanks, Harold
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