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Basic tests for size_of_val and min_alig_of_val #1101

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merged 5 commits into from
Apr 27, 2022

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Description of changes:

Adds two tests for size_of_val and min_align_of_val.

@celinval added tests for dynamically-sized types in #1089 , these ones just complement them by testing basic types.

Resolved issues:

Part of #727

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Testing:

  • How is this change tested? Adds two tests.

  • Is this a refactor change? No.

Checklist

  • Each commit message has a non-empty body, explaining why the change was made
  • Methods or procedures are documented
  • Regression or unit tests are included, or existing tests cover the modified code
  • My PR is restricted to a single feature or bugfix

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

@adpaco-aws adpaco-aws requested a review from a team as a code owner April 23, 2022 20:36
enum MyEnum {
Variant,
}

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Might be interesting to add a repr(C) struct which would require padding and make sure we get this right

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Added a repr(C) struct and assertions based on it. As far as I can tell, it's working as expected:

  • Size takes into account padding
  • Alignment is the max alignment for each field
    But let me know if you want to test specific cases and I will add them.

// SPDX-License-Identifier: Apache-2.0 OR MIT

// Check that we get the expected results for the `min_align_of_val` intrinsic
// with common data types
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Is this architecture specific, of do these min aligns come from the rust spec?

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My understanding is that min_align_of_val depends on min_global_align, which is an architecture option.
Please note that in #1054 we added checks to ensure that min_global_align is unspecified or equal to 1, otherwise Kani will stop there.

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Can you add a comment that the tests here assume x86, otherwise good to go.

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Approved modulo one comment

// SPDX-License-Identifier: Apache-2.0 OR MIT

// Check that we get the expected results for the `min_align_of_val` intrinsic
// with common data types
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Can you add a comment that the tests here assume x86, otherwise good to go.

@adpaco-aws adpaco-aws merged commit f7a9a59 into model-checking:main Apr 27, 2022
@adpaco-aws adpaco-aws mentioned this pull request Apr 27, 2022
tedinski pushed a commit that referenced this pull request Apr 27, 2022
* Basic tests for `size_of_val` and `min_alig_of_val`

* Fix format

* Add cases for `repr(C)` struct

* Add note
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2 participants