Research Inlined Instance data

[stevemk14ebr]

https://github.com/elastic/otel-profiling-agent/blob/main/docs/gopclntab.md

speaks of Inlined Instance Data. Research how this can be utilized for RE purposed and labelling an IDA database better.

[stevemk14ebr]

struct runtime_inlinedCall {
  uint8_t funcID;
  uint8_t _[3];
  int32_t nameOff;
  int32_t parentPc;
  int32_t startLine;
};

From the document, parentPc can be used to locate the parent function, and startLine + nameOff can likely be used to annotate the specific VA where an inlined function starts (and ends) by name. I suspect startLine will need to be looked up in the line table to get the VA rather than line number.

[brigadier-general]

go src file with inlining logic, for reference -- https://github.com/golang/go/blob/go1.20.6/src/cmd/compile/internal/inline/inl.go

[brigadier-general]

explanation of how/why go compiler does leaf inlining -- https://dave.cheney.net/2020/04/25/inlining-optimisations-in-go

[kami922]

@stevemk14ebr Hello this seems smooth to fix can you please tell me why it was closed but not merged. Can I work on it if yes. can you please tell me what was the reason this branch was not merged last time was it incomplete or differences in approaches.

[stevemk14ebr]

The branch was incomplete and the contributor as well as myself did not have time to complete the work.

You can work on this, but I might suggest waiting and applying for GSoC and making this a work item for that. I'd also like to get your other PRs completed and over the finish line before opening another.