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interpret/memory: fix safety comment for large array memset optimization #120387

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merged 1 commit into from
Jan 30, 2024

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RalfJung
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Also fix the doc comment for check_and_deref_ptr.

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rustbot commented Jan 26, 2024

r? @oli-obk

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 26, 2024
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rustbot commented Jan 26, 2024

Some changes occurred to the CTFE / Miri engine

cc @rust-lang/miri

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oli-obk commented Jan 29, 2024

@bors r+ rollup

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bors commented Jan 29, 2024

📌 Commit bdfb917 has been approved by oli-obk

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 29, 2024
// that this read at type `u8` is OK -- it must be an initialized byte.
if size_in_bytes == 1 {
debug_assert!(num_copies >= 1); // we already handled the zero-sized cases above.
// SAFETY: `src_bytes` would be read from anyway by `copy` below (num_copies >= 1).
let value = *src_bytes;
dest_bytes.write_bytes(value, (size * num_copies).bytes_usize());
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This line seems more dangerous and we don't have a comment on it at all 😆 I'll try to add one this week

bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 30, 2024
…llaumeGomez

Rollup of 18 pull requests

Successful merges:

 - rust-lang#119123 (Add triagebot mentions entry for simd intrinsics)
 - rust-lang#119991 (Reject infinitely-sized reads from io::Repeat)
 - rust-lang#120172 (bootstrap: add more unit tests)
 - rust-lang#120250 (rustdoc: Prevent JS injection from localStorage)
 - rust-lang#120376 (Update codegen test for LLVM 18)
 - rust-lang#120387 (interpret/memory: fix safety comment for large array memset optimization)
 - rust-lang#120400 (Bound errors span label cleanup)
 - rust-lang#120402 (Make the coroutine def id of an async closure the child of the closure def id)
 - rust-lang#120403 (Add instructions of how to use pre-vendored 'rustc-src')
 - rust-lang#120424 (raw pointer metadata API: data address -> data pointer)
 - rust-lang#120425 (Remove unnecessary unit returns in query declarations)
 - rust-lang#120439 (Move UI issue tests to subdirectories)
 - rust-lang#120443 (Fixes footnote handling in rustdoc)
 - rust-lang#120452 (std: Update documentation of seek_write on Windows)
 - rust-lang#120460 (Be more careful about interpreting a label/lifetime as a mistyped char literal.)
 - rust-lang#120464 (Add matthewjasper to some review groups)
 - rust-lang#120467 (Update books)
 - rust-lang#120488 (Diagnostic lifetimes cleanups)

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`@rustbot` modify labels: rollup
@bors bors merged commit e0e96a1 into rust-lang:master Jan 30, 2024
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@rustbot rustbot added this to the 1.77.0 milestone Jan 30, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jan 30, 2024
Rollup merge of rust-lang#120387 - RalfJung:large-array-followup, r=oli-obk

interpret/memory: fix safety comment for large array memset optimization

Also fix the doc comment for `check_and_deref_ptr`.
@RalfJung RalfJung deleted the large-array-followup branch January 31, 2024 09:16
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4 participants