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exit and exit_group never return to userspace, so their sys_exit
tracepoints can never fire. The generator previously emitted matching
EXIT_RET_EVENT handlers anyway, producing dead code in the generated BPF
program. classifySyscall now skips exit-handler emission for noreturn
syscalls via isNoreturnSyscall, and the regenerated artifacts drop the
sys_exit_exit / sys_exit_exit_group handlers (enter handlers are kept).
Tests updated to match the new reality:
- TestGenerateExitNoreturnHandlers asserts no exit handler is emitted.
- TestClassifySyscallPairEmitsAllFamilies exempts noreturn syscalls from
the exit-handler-required assertion while staying strict for all others.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Introduce kindregistry.go with a kindMeta struct (structName, enterAccepted)
and a kindRegistry map keyed by TracepointKind. Replace the switch in
isEnterRejected (codegen.go) and the switch in eventStructName (bpfhandler.go)
with lookupKind registry lookups. Adding a new TracepointKind now only
requires a single registry entry — no switch statements need to be touched.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Amp-Thread-ID: https://ampcode.com/threads/T-019c7f4e-cc5f-76f1-aaf0-dd7cbaabbb18
Co-authored-by: Amp <amp@ampcode.com>
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