[PROF-13913] Ensure opentelemetry-ebpf-profiler support for JDK 26#55
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Upstream PR: open-telemetry#1240
What does this PR do?
Adds JDK 26 support to the HotSpot JVM interpreter in the eBPF profiler. It handles breaking changes in the JDK 26 nmethod VM struct by adding new field mappings and adjusting immutable data size calculation to account for the new ref count trailer.
Key changes in interpreter/hotspot/:
data.go: AddedImmutableDataRefCountOfffield (JDK 26+), added_deopt_handler_entry_offsetas an alias forDeoptimizeOffset.instance.go: When_immutable_data_ref_count_offsetis present, use it to cap the immutable data region size.hotspot.go: Documented JDK 26 changes in the version history comment block.Motivation
JDK 26 introduces several changes in the HotSpot VM internals (renamed/removed fields in
nmethod, new_immutable_data_ref_count_offsetfield, renumberedPcDescflags). Without these fixes, the eBPF profiler cannot correctly unwind Java stacks on JDK 26.The objective is to identify the breaking changes introduced by this new JDK version and ensure they are properly handled.
Describe how you validated your changes
Additional Notes