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Tracking issue for -Z randomize-layout #106764

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dtolnay opened this issue Jan 12, 2023 · 1 comment
Open
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Tracking issue for -Z randomize-layout #106764

dtolnay opened this issue Jan 12, 2023 · 1 comment
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-Zrandomize-layout Unstable option: Randomize the layout of types. A-CLI Area: Command-line interface (CLI) to the compiler A-layout Area: Memory layout of types C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@dtolnay
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dtolnay commented Jan 12, 2023 •
edited by the8472
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This is a tracking issue for the unstable rustc flag -Zrandomize-layout. (rust-lang/compiler-team#457)

About tracking issues

Tracking issues are used to record the overall progress of implementation. They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions. A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature. Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.

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@dtolnay dtolnay added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC A-layout Area: Memory layout of types labels Jan 12, 2023
This was referenced Jan 12, 2023
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@workingjubilee workingjubilee added A-CLI Area: Command-line interface (CLI) to the compiler -Zrandomize-layout Unstable option: Randomize the layout of types. labels Mar 5, 2023
This was referenced Aug 31, 2024
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@fasterthanlime fasterthanlime mentioned this issue Sep 17, 2024
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@the8472 the8472 mentioned this issue Nov 16, 2024
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bors added a commit to rust-lang-ci/rust that referenced this issue Nov 24, 2024
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Auto merge of rust-lang#133088 - the8472:randomize-me-harder, r=<try>
0e4cbcd 
`-Zrandomize-layout` harder. `Foo<T> != Foo<U>`

Tracking issue: rust-lang#106764

Previously randomize-layout only used a deterministic shuffle based on the seed stored in an Adt's ReprOptions, meaning that `Foo<T>`  and `Foo<U>` were shuffled by the same seed. This change adds a similar seed to each calculated LayoutData so that a struct can be randomized both based on the layout of its fields and its per-type seed.
Primitives start with simple seed derived from some of their properties. Though some types can no longer be distinguished at that point, e.g. usize and u64 will still be treated the same.
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Labels
-Zrandomize-layout Unstable option: Randomize the layout of types. A-CLI Area: Command-line interface (CLI) to the compiler A-layout Area: Memory layout of types C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@dtolnay @saethlin @workingjubilee