Patch name: hotswap.patch
Description: hotswap.txt
Implementation Notes
Thomas Wuerthinger, Dynamic Code Evolution for the Java HotSpotVirtual Machine
General Design Decisions
- Arbitrary changes possible (including changes to subtype relationships)
- No performance penalty before or after the change
- No introduced indirections
- Continued execution of old active methods
- Only simple, comprehensible strategies for field matching or method transitions
- Change possible at any point when the VM is suspended
- Graceful handling of accesses to deleted fields or calls of deleted methods
Status
- General mechanisms including the modifications to the garbage collector implemented, however still stability issues.
- Missing critical feature: Determine safety of type narrowing changes.
- Next step: Stabilize using the hotswapping test suite.
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