llvm / llvm/circt

[ESI][Runtime][Cosim] Terminate with "pure virtual called"

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ESI
Dominant language
C++
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Description

If a connected read port has incoming data while the accelerator connection is being closed, this exception is thrown in a deconstructor (and the program terminates since C++ has that behavior).

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the failure described when a connected read port receives data while the accelerator connection closes. Trace the co-simulation runtime's connection shutdown and destruction paths; done means that this sequence no longer terminates with a pure virtual call and the relevant behavior is covered by a regression test.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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