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Make intrinsics::write_bytes const #90081

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merged 1 commit into from
Dec 12, 2021
Merged

Make intrinsics::write_bytes const #90081

merged 1 commit into from
Dec 12, 2021

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lilasta
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@lilasta lilasta commented Oct 20, 2021 •
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This is required to constify MaybeUninit::zeroed and (*mut T)::write_bytes.

Tracking issue: #86302

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r? @joshtriplett

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 20, 2021
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oli-obk commented Oct 20, 2021

blocked on #90041

@oli-obk oli-obk added the S-blocked Status: Blocked on something else such as an RFC or other implementation work. label Oct 20, 2021
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@lilasta lilasta marked this pull request as draft October 24, 2021 10:08
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@lilasta lilasta marked this pull request as ready for review October 25, 2021 06:13
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oli-obk commented Oct 25, 2021

Should I create a tracking issue?

I think you can just point to the const_mut_refs tracking issue, as there is no reason not to stabilize write_bytes as const once we have mutable references

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lilasta commented Oct 25, 2021

I just found the const_ptr_write tracking issue (86302), so I changed to it.

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oli-obk commented Oct 25, 2021

@bors r+

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bors commented Oct 25, 2021

📌 Commit 15c2613a86a227937058a7d4ff68068cce5f4f1e has been approved by oli-obk

@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. S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Oct 25, 2021
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oli-obk commented Oct 25, 2021

@bors rollup

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blocked on #90041

Isn't it still blocked?

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oli-obk commented Oct 25, 2021

@bors r- uuuh gotta check. Sorry, thanks for the ping

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 25, 2021
@apiraino apiraino added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Oct 28, 2021
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bors commented Nov 13, 2021

☔ The latest upstream changes (presumably #90041) made this pull request unmergeable. Please resolve the merge conflicts.

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lilasta commented Nov 16, 2021

Rebased.

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library/core/src/intrinsics.rs Outdated
Comment on lines 2253 to 2256
#[cfg(not(bootstrap))]
const fn compiletime_check<T>(_ptr: *mut T) {
// The CTFE-engine checks if the pointer is correctly aligned and not null.
}
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similarly to the other PR, please just call this function nop and mention on the const_eval_select call that it's just a debug assertion and so it's not a problem if CTFE does not check it, even if it checks some of the rules

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ecstatic-morse commented Nov 23, 2021 •
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@woppopo MaybeUninit::zeroed was one of the functions that the Rust-for-Linux devs mentioned specifically in today's CTCFT as being useful in a const context. Any chance you'd be able to incorporate Oli's feedback in the near future? It would be nice to get this onto nightly now that it's unblocked.

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lilasta commented Nov 23, 2021 •
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Thank you for telling me. I added #[cfg(debug_assertions)] to the functions needed for checking, and unified with the same style as #90041.

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oli-obk commented Nov 23, 2021

@bors r+ rollup

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bors commented Nov 23, 2021

📌 Commit e8e02d9 has been approved by oli-obk

@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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 23, 2021
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Nov 23, 2021
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Rollup merge of rust-lang#90081 - woppopo:const_write_bytes, r=oli-obk
aa73065 
Make `intrinsics::write_bytes` const

This is required to constify `MaybeUninit::zeroed` and `(*mut T)::write_bytes`.

Tracking issue: rust-lang#86302
@matthiaskrgr matthiaskrgr mentioned this pull request Nov 23, 2021
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camelid commented Dec 10, 2021

It seems this branch was pushed to after the PR was approved, so it needs a new review.

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camelid commented Dec 10, 2021

@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Dec 10, 2021
@camelid camelid added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Dec 10, 2021
@camelid camelid assigned oli-obk and unassigned joshtriplett Dec 10, 2021
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oli-obk commented Dec 11, 2021

@bors r+

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bors commented Dec 11, 2021

📌 Commit 89b2e0c has been approved by oli-obk

@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 Dec 11, 2021
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Dec 11, 2021
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Rollup merge of rust-lang#90081 - woppopo:const_write_bytes, r=oli-obk
646af41 
Make `intrinsics::write_bytes` const

This is required to constify `MaybeUninit::zeroed` and `(*mut T)::write_bytes`.

Tracking issue: rust-lang#86302
@matthiaskrgr matthiaskrgr mentioned this pull request Dec 11, 2021
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@matthiaskrgr matthiaskrgr mentioned this pull request Dec 11, 2021
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bors added a commit to rust-lang-ci/rust that referenced this pull request Dec 12, 2021
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Auto merge of rust-lang#91813 - matthiaskrgr:rollup-nryyeyj, r=matthi…
e70e4d4 
…askrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#90081 (Make `intrinsics::write_bytes` const)
 - rust-lang#91643 (asm: Allow using r9 (ARM) and x18 (AArch64) if they are not reserved by the current target)
 - rust-lang#91737 (Make certain panicky stdlib functions behave better under panic_immediate_abort)
 - rust-lang#91750 (rustdoc: Add regression test for Iterator as notable trait on &T)
 - rust-lang#91764 (Do not ICE when suggesting elided lifetimes on non-existent spans.)
 - rust-lang#91780 (Remove hir::Node::hir_id.)
 - rust-lang#91797 (Fix zero-sized reference to deallocated memory)
 - rust-lang#91806 (Make `Unique`s methods `const`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 9383a49 into rust-lang:master Dec 12, 2021
@rustbot rustbot added this to the 1.59.0 milestone Dec 12, 2021
@lilasta lilasta deleted the const_write_bytes branch December 12, 2021 03:57
@lilasta lilasta mentioned this pull request Dec 13, 2021
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