runtimeverification / runtimeverification/mir-semantics
Problems matching a symbolic stack (stacks ending in a list variable)
Nobody has claimed this yet.
- Dominant language
- Python
- Stars
- 52
- Forks
- 5
- PR merge metrics
- No merged PRs in 30d
Description
Rules for terminatorKindReturn and #setArgFromStack which access the top stack frame do not work (in HS backend running symbolic execution) when the stack ends in a list-sorted variable, like
<stack> StackFrame(_, _, _, _, _LOCALS) REST_OF_STACK </stack>
When replacing REST_OF_STACK with .List the rule is getting applied again.
- Analyse this further using a K claim with LHS having a stack with a variable
- Possibly a bug in HS backend (list matching weakness)
- It is not the call to
size(LIST)
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the terminatorKindReturn and #setArgFromStack rules and reproduce the symbolic-execution case using a K claim whose left-hand side has a stack variable. Compare the list-variable stack with the .List case in the HS backend, and determine whether the matching behavior is a backend bug; done means the cause and a focused resolution are established.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- haskell
- Domain
- backend, compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100