Stub panics during MIR transformation #4169
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zhassan-aws
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Jun 19, 2025
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@zhassan-aws I just added a test that runs |
zhassan-aws
reviewed
Jun 20, 2025
to ensure that each test is stubbed and not just any of the 3
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Jul 3, 2025
Auto generated release notes: ## What's Changed * Edit quantifiers' documentation. by @thanhnguyen-aws in #4142 * Fix the bug of using multiple hidden variables for the prev of the same Expr by @thanhnguyen-aws in #4150 * Remove `assess` subcommand by @carolynzech in #4111 * Optimize goto binary exporting in `cprover_bindings` by @AlexanderPortland in #4148 * Add the option to generate performance flamegraphs by @AlexanderPortland in #4138 * Fix the bug: Static union values can panic Kani by @thanhnguyen-aws in #4112 * Update toolchain to 2025-06-13 by @carolynzech in #4152 * Automatic cargo update to 2025-06-16 by @github-actions in #4156 * Major-version update cargo dependencies by @tautschnig in #4158 * Upgrade Rust toolchain to 2025-06-16 by @tautschnig in #4157 * Bump tests/perf/s2n-quic from `3129ad5` to `c6e694e` by @dependabot in #4160 * Bump tests/perf/s2n-quic from `c6e694e` to `b1b5bf8` by @dependabot in #4164 * Upgrade Rust toolchain to 2025-06-17 by @tautschnig in #4163 * Automatic cargo update to 2025-06-23 by @github-actions in #4172 * Stub panics during MIR transformation by @AlexanderPortland in #4169 * Bump tests/perf/s2n-quic from `b1b5bf8` to `32ba87d` by @dependabot in #4175 * Handle enums with zero or one variants by @zhassan-aws in #4171 * Introduce compiler timing script & CI job by @AlexanderPortland in #4154 * Upgrade Rust toolchain to 2025-06-18 by @tautschnig in #4166 * Cache dependencies for CI jobs by @AlexanderPortland in #4181 * Autoharness: Derive `Arbitrary` for structs and enums by @carolynzech in #4167 * Upgrade Rust toolchain to 2025-06-27 by @tautschnig in #4182 * Include wget in dependencies by @zhassan-aws in #4183 * Automatic cargo update to 2025-06-30 by @github-actions in #4186 * Add support for loop assigns in loop contracts by @thanhnguyen-aws in #4174 * Upgrade toolchain to 06/30 by @carolynzech in #4188 * Optimize reachability with non-mutating global passes by @AlexanderPortland in #4177 * Bump tests/perf/s2n-quic from `32ba87d` to `b8f8cca` by @dependabot in #4190 * Bump ncipollo/release-action from 1.16.0 to 1.18.0 by @dependabot in #4191 * Upgrade toolchain to 07/02 by @carolynzech in #4195 * Automatic Derivation Fixes by @carolynzech in #4194 **Full Changelog**: kani-0.63.0...kani-0.64.0 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.
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Modifies the
RustcIntrinsicsPassto stub out panic functions during body transformation at the MIR level. This avoids having to bring in (and do transformation passes on) the large amounts of code they use for string formatting. Our panic hook has been modified to then detect these stubs during codegen and still generate the same Goto code for them.The results of this change on the MIR bloat of
panic!()and its callers is shown below:Option<usize>::unwrap()Option<usize>::expect()Result<usize, usize>::unwrap()Result<usize, usize>::expect()panic!("hello!")panic!("hello {x}!")(x being a&'static str)The lack of significant improvement on the two
Resultfunctions is elaborated on in #4168 and will take additional consideration to fix.Resolves #2835
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.