Add experimental API to generate arbitrary pointers #3538
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Pointer generator that can be used to generate an arbitrary pointer. This generator allows users to build pointers with different allocation status, initialization and alignemnt. It contains an internal buffer that it uses to generate `InBounds` and `OutBounds` pointers. In those cases, the pointers will have the same provenance as the generator, and the same lifetime.
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Appears to break std verification: |
tautschnig
reviewed
Sep 24, 2024
Make the type a parameter to the generator methods instead of the type.
Needed to change use order of test
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@tautschnig, hopefully I addressed all your comments. I also moved the pointer type to be an argument of the methods instead of the generator type. |
zhassan-aws
approved these changes
Oct 4, 2024
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This change adds a pointer generator that can non-deterministically generate a pointer with different properties.
This generator allows users to build pointers with different allocation status, initialization and alignment.
It contains an internal buffer that it uses to generate
InBoundsandOutOfBoundspointers.In those cases, the pointers will have the same provenance as the generator, and the same lifetime.
This approach is different than generating a pointer from an arbitrary
usize. Kani uses demonic non-determinism to trackallocation lifetimes, which makes hard to reason about during verification. I.e., one cannot assume a pointer is valid, and initialized, and this can only be accomplished by manually tracking the pointer status.
I added the new API under
-Z mem-predicatessince it allows reasoning about memory, and I was hoping this wouldn't need another unstable flag. 😄By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.