Verify safety of slice functions with VeriFast + Kani (Challenge 17)#559
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Verify safety of slice functions with VeriFast + Kani (Challenge 17)#559jrey8343 wants to merge 1 commit intomodel-checking:mainfrom
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Dual VeriFast + Kani approach covering all 37 required functions. ## VeriFast (14 functions, 68 statements verified) Separation logic proofs with pre/postconditions for functions that don't require const generics or complex trait bounds: **Unsafe (5):** swap_unchecked, split_at_unchecked, split_at_mut_unchecked, align_to, align_to_mut **Safe (9):** reverse, split_at_checked, split_at_mut_checked, rotate_left, rotate_right, copy_from_slice, copy_within, swap_with_slice, partition_dedup_by ## Kani (28 proof harnesses) Bounded model checking for const-generic, SIMD, and closure-based functions that VeriFast's translator cannot yet handle: - first_chunk, first_chunk_mut (N=0,1,2,4,8) - split_first_chunk, split_first_chunk_mut (N=0,1,4) - split_last_chunk, split_last_chunk_mut (N=0,1,4) - last_chunk, last_chunk_mut (N=0,1,4) - as_chunks, as_rchunks, as_chunks_mut (N=1,2,4,8) - as_chunks_unchecked, as_chunks_unchecked_mut (N=1,2,4) - as_flattened, as_flattened_mut (N=1,2,4) - as_simd, as_simd_mut (u8/u32 × LANES=2,4) - get_unchecked, get_unchecked_mut - get_disjoint_mut (N=2,3), get_disjoint_unchecked_mut (N=2) - get_disjoint_check_valid (N=2) - binary_search_by, copy_within ## Tools - VeriFast 25.11-slice-support (custom fork with &[T] support) - Kani (pinned version from tool_config/kani-version.toml) Resolves model-checking#281 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Dual VeriFast + Kani verification of all 37 required functions in
library/core/src/slice/mod.rs, covering both unsafe functions (with safety contracts) and safe functions containing unsafe code.VeriFast (14 functions, 68 statements verified)
Separation logic proofs using VeriFast 25.11-slice-support (custom fork with
&[T]support, upstream PR #1002):swap_unchecked,split_at_unchecked,split_at_mut_unchecked,align_to,align_to_mutreverse,split_at_checked,split_at_mut_checked,rotate_left,rotate_right,copy_from_slice,copy_within,swap_with_slice,partition_dedup_byKani (28 proof harnesses)
Bounded model checking for functions requiring const generics, SIMD types, or closure trait bounds:
first_chunk,first_chunk_mut,split_first_chunk,split_first_chunk_mut,split_last_chunk,split_last_chunk_mut,last_chunk,last_chunk_mutas_chunks,as_rchunks,as_chunks_mut,as_chunks_unchecked,as_chunks_unchecked_mutas_flattened,as_flattened_mutas_simd,as_simd_mutget_unchecked,get_unchecked_mut,get_disjoint_mut,get_disjoint_unchecked_mut,get_disjoint_check_validbinary_search_bycopy_withinWhy Two Tools?
VeriFast provides separation logic proofs (strongest guarantees) but currently lacks support for:
ConstKind::Param)FnMut,FnOnce::Output)SliceIndextrait dispatchThese limitations are being addressed upstream (PR #1002). Kani fills the gap for affected functions via bounded model checking with symbolic inputs.
Test plan
verifast-proofs/check-verifast-proofs.shpasses (4 proofs, 5778 statements)kani verify-std