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8275527: Refactor forward pointer access #5955
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7ca9ca9
Initial implementation of MarkWordDecoder
b3640fa
Renames, cleanups
922a806
Move remaining forwarding methods to OopForwarding
8819343
Add missing file
e38a89b
Rename mwd -> fwd
a0e3a6a
Add missing includes
f22c211
Merge branch 'master' into optimize-fwdptr
5058cba
Add missing includes
ec0a4ba
Update some copyright headers
75fdec3
Revert unnecessary changes
a9f0c84
Fix Parallel GC mistake
9c2ed2f
Move forward impl into markWord and add assert
c83e404
Don't use forwarded terminology in markWord
d63962a
Merge branch 'master' into optimize-fwdptr
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Could you explain why this was removed?
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The G1 Full GC code decoded the fwdptr without checking if object is actually forwarded (i.e. by checking the lowest two mark word bits), and then compare the result with NULL. In order for this to work, it modifies the mark word of not forwarded objects to prototype mark. This is all quite messy and can be avoided by checking is_forwarded() before actually decoding the fwdptr.