closure field capturing: don't depend on alignment of packed fields #115315

RalfJung · 2023-08-28T13:46:17Z

This fixes the closure field capture part of #115305: field capturing always stops at projections into packed structs, no matter the alignment of the field. This means changing a private field type from u8 to u64 can never change how closures capture fields, which is probably what we want.

Here's an example where, before this PR, changing the type of a private field in a repr(Rust) struct can change the output of a program:

#![allow(dead_code)]

mod m {
    // before patch
    #[derive(Default)]
    pub struct S1(u8);
    // after patch
    #[derive(Default)]
    pub struct S2(u64);
}

struct NoisyDrop;
impl Drop for NoisyDrop {
    fn drop(&mut self) {
        eprintln!("dropped!");
    }
}

#[repr(packed)]
struct MyType {
    field: m::S1, // output changes when this becomes S2
    other_field: NoisyDrop,
    third_field: Vec<()>,
}

fn test(r: MyType) {
    let c = || {
        let _val = std::ptr::addr_of!(r.field);
        let _val = r.third_field;
    };
    drop(c);
    eprintln!("before dropping");
}

fn main() {
    test(MyType {
        field: Default::default(),
        other_field: NoisyDrop,
        third_field: Vec::new(),
    });
}

Of course this is a breaking change for the same reason that doing field capturing in the first place was a breaking change. Packed fields are relatively rare and depending on drop order is relatively rare, so I don't expect this to have much impact, but it's hard to be sure and even a crater run will only tell us so much.

Also see the nomination comment.

Cc @rust-lang/wg-rfc-2229 @ehuss

rustbot · 2023-08-28T13:46:22Z

r? @petrochenkov

(rustbot has picked a reviewer for you, use r? to override)

RalfJung · 2023-08-28T13:47:20Z

@bors try

bors · 2023-08-28T13:47:31Z

⌛ Trying commit e17af739d0ffdef2d40b093d9bedfa8f44205707 with merge 6c5b2f071bf9fe3a4b05942f31d42d076171aa61...

bors · 2023-08-28T14:58:21Z

☀️ Try build successful - checks-actions
Build commit: 6c5b2f071bf9fe3a4b05942f31d42d076171aa61 (6c5b2f071bf9fe3a4b05942f31d42d076171aa61)

RalfJung · 2023-08-28T16:24:47Z

@craterbot run mode=build-and-test

craterbot · 2023-08-28T16:24:58Z

👌 Experiment pr-115315 created and queued.
🤖 Automatically detected try build 6c5b2f071bf9fe3a4b05942f31d42d076171aa61
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2023-08-28T16:25:01Z

🚧 Experiment pr-115315 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2023-08-30T07:27:14Z

🎉 Experiment pr-115315 is completed!
📊 155 regressed and 103 fixed (356067 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

RalfJung · 2023-08-30T07:42:48Z

@craterbot run mode=build-and-test crates=https://crater-reports.s3.amazonaws.com/pr-115315/retry-regressed-list.txt

craterbot · 2023-08-30T07:42:53Z

👌 Experiment pr-115315-1 created and queued.
🤖 Automatically detected try build 6c5b2f071bf9fe3a4b05942f31d42d076171aa61
⚠️ Try build based on commit e17af739d0ffdef2d40b093d9bedfa8f44205707, but latest commit is a671127. Did you forget to make a new try build?
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2023-08-31T12:27:58Z

🚧 Experiment pr-115315-1 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2023-08-31T20:38:04Z

🎉 Experiment pr-115315-1 is completed!
📊 17 regressed and 11 fixed (155 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

RalfJung · 2023-08-31T20:58:30Z

None of these look like they would be caused by this PR... 🤷

@craterbot run mode=build-and-test crates=https://crater-reports.s3.amazonaws.com/pr-115315-1/retry-regressed-list.txt

craterbot · 2023-08-31T20:58:37Z

👌 Experiment pr-115315-2 created and queued.
🤖 Automatically detected try build 6c5b2f071bf9fe3a4b05942f31d42d076171aa61
⚠️ Try build based on commit e17af739d0ffdef2d40b093d9bedfa8f44205707, but latest commit is a671127. Did you forget to make a new try build?
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

rfcbot · 2023-09-15T18:41:12Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

RalfJung · 2023-09-15T20:54:48Z

r=me on the impl

@bors r=oli-obk

bors · 2023-09-15T20:54:50Z

📌 Commit a671127 has been approved by oli-obk

It is now in the queue for this repository.

RalfJung · 2023-09-15T20:56:12Z

I added the relnotes label because this is a breaking change that maybe should be announced in the release notes -- not sure of our exact policy here.

bors · 2023-09-15T23:31:36Z

⌛ Testing commit a671127 with merge 651b2ca...

…ent, r=oli-obk closure field capturing: don't depend on alignment of packed fields This fixes the closure field capture part of rust-lang#115305: field capturing always stops at projections into packed structs, no matter the alignment of the field. This means changing a private field type from `u8` to `u64` can never change how closures capture fields, which is probably what we want. Here's an example where, before this PR, changing the type of a private field in a repr(Rust) struct can change the output of a program: ```rust #![allow(dead_code)] mod m { // before patch #[derive(Default)] pub struct S1(u8); // after patch #[derive(Default)] pub struct S2(u64); } struct NoisyDrop; impl Drop for NoisyDrop { fn drop(&mut self) { eprintln!("dropped!"); } } #[repr(packed)] struct MyType { field: m::S1, // output changes when this becomes S2 other_field: NoisyDrop, third_field: Vec<()>, } fn test(r: MyType) { let c = || { let _val = std::ptr::addr_of!(r.field); let _val = r.third_field; }; drop(c); eprintln!("before dropping"); } fn main() { test(MyType { field: Default::default(), other_field: NoisyDrop, third_field: Vec::new(), }); } ``` Of course this is a breaking change for the same reason that doing field capturing in the first place was a breaking change. Packed fields are relatively rare and depending on drop order is relatively rare, so I don't expect this to have much impact, but it's hard to be sure and even a crater run will only tell us so much. Also see the [nomination comment](rust-lang#115315 (comment)). Cc `@rust-lang/wg-rfc-2229` `@ehuss`

rust-log-analyzer · 2023-09-16T00:02:06Z

The job aarch64-gnu failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

[RUSTC-TIMING] process_spawning test:true 1.334
[RUSTC-TIMING] env test:true 1.519
[RUSTC-TIMING] stdbenches test:true 2.923
[RUSTC-TIMING] test test:true 14.923
##[error]The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
##[group]Clock drift check
  local time: Sat Sep 16 00:01:50 UTC 2023
  local time: Sat Sep 16 00:01:50 UTC 2023
Session terminated, killing shell... ...killed.
##[error]The operation was canceled.
Cleaning up orphan processes

bors · 2023-09-16T00:02:36Z

💔 Test failed - checks-actions

RalfJung · 2023-09-16T05:23:36Z

@bors retry The runner has received a shutdown signal (aarch64-gnu)

bors · 2023-09-16T05:29:27Z

⌛ Testing commit a671127 with merge 790309b...

bors · 2023-09-16T07:17:14Z

☀️ Test successful - checks-actions
Approved by: oli-obk
Pushing 790309b to master...

rust-timer · 2023-09-16T08:39:18Z

Finished benchmarking commit (790309b): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.8%	[2.8%, 2.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.9%	[-2.9%, -2.9%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.3%	[-1.3%, -1.3%]	1
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 632.885s -> 632.342s (-0.09%)
Artifact size: 318.13 MiB -> 318.18 MiB (0.01%)

…i-obk closure field capturing: don't depend on alignment of packed fields This fixes the closure field capture part of rust-lang/rust#115305: field capturing always stops at projections into packed structs, no matter the alignment of the field. This means changing a private field type from `u8` to `u64` can never change how closures capture fields, which is probably what we want. Here's an example where, before this PR, changing the type of a private field in a repr(Rust) struct can change the output of a program: ```rust #![allow(dead_code)] mod m { // before patch #[derive(Default)] pub struct S1(u8); // after patch #[derive(Default)] pub struct S2(u64); } struct NoisyDrop; impl Drop for NoisyDrop { fn drop(&mut self) { eprintln!("dropped!"); } } #[repr(packed)] struct MyType { field: m::S1, // output changes when this becomes S2 other_field: NoisyDrop, third_field: Vec<()>, } fn test(r: MyType) { let c = || { let _val = std::ptr::addr_of!(r.field); let _val = r.third_field; }; drop(c); eprintln!("before dropping"); } fn main() { test(MyType { field: Default::default(), other_field: NoisyDrop, third_field: Vec::new(), }); } ``` Of course this is a breaking change for the same reason that doing field capturing in the first place was a breaking change. Packed fields are relatively rare and depending on drop order is relatively rare, so I don't expect this to have much impact, but it's hard to be sure and even a crater run will only tell us so much. Also see the [nomination comment](rust-lang/rust#115315 (comment)). Cc `@rust-lang/wg-rfc-2229` `@ehuss`

Pkgsrc changes: * Remove NetBSD-8 support (embedded LLVm requires newer C++ than what is in -8; it's conceivable that this could still build with an external LLVM) * undo powerpc 9.0 file naming tweak, since we no longer support -8. * Remove patch to LLVM for powerpc now included by upstream. * Minor adjustments, checksum changes etc. Upstream changes: Version 1.74.1 (2023-12-07) =========================== - [Resolved spurious STATUS_ACCESS_VIOLATIONs in LLVM] (rust-lang/rust#118464) - [Clarify guarantees for std::mem::discriminant] (rust-lang/rust#118006) - [Fix some subtyping-related regressions] (rust-lang/rust#116415) Version 1.74.0 (2023-11-16) ========================== Language -------- - [Codify that `std::mem::Discriminant<T>` does not depend on any lifetimes in T] (rust-lang/rust#104299) - [Replace `private_in_public` lint with `private_interfaces` and `private_bounds` per RFC 2145] (rust-lang/rust#113126) Read more in [RFC 2145](https://rust-lang.github.io/rfcs/2145-type-privacy.html). - [Allow explicit `#[repr(Rust)]`] (rust-lang/rust#114201) - [closure field capturing: don't depend on alignment of packed fields] (rust-lang/rust#115315) - [Enable MIR-based drop-tracking for `async` blocks] (rust-lang/rust#107421) Compiler -------- - [stabilize combining +bundle and +whole-archive link modifiers] (rust-lang/rust#113301) - [Stabilize `PATH` option for `--print KIND=PATH`] (rust-lang/rust#114183) - [Enable ASAN/LSAN/TSAN for `*-apple-ios-macabi`] (rust-lang/rust#115644) - [Promote loongarch64-unknown-none* to Tier 2] (rust-lang/rust#115368) - [Add `i686-pc-windows-gnullvm` as a tier 3 target] (rust-lang/rust#115687) Libraries --------- - [Implement `From<OwnedFd/Handle>` for ChildStdin/out/err] (rust-lang/rust#98704) - [Implement `From<{&,&mut} [T; N]>` for `Vec<T>` where `T: Clone`] (rust-lang/rust#111278) - [impl Step for IP addresses] (rust-lang/rust#113748) - [Implement `From<[T; N]>` for `Rc<[T]>` and `Arc<[T]>`] (rust-lang/rust#114041) - [`impl TryFrom<char> for u16`] (rust-lang/rust#114065) - [Stabilize `io_error_other` feature] (rust-lang/rust#115453) - [Stabilize the `Saturating` type] (rust-lang/rust#115477) - [Stabilize const_transmute_copy] (rust-lang/rust#115520) Stabilized APIs --------------- - [`core::num::Saturating`] (https://doc.rust-lang.org/stable/std/num/struct.Saturating.html) - [`impl From<io::Stdout> for std::process::Stdio`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CStdout%3E-for-Stdio) - [`impl From<io::Stderr> for std::process::Stdio`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CStderr%3E-for-Stdio) - [`impl From<OwnedHandle> for std::process::Child{Stdin, Stdout, Stderr}`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CStderr%3E-for-Stdio) - [`impl From<OwnedFd> for std::process::Child{Stdin, Stdout, Stderr}`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CStderr%3E-for-Stdio) - [`std::ffi::OsString::from_encoded_bytes_unchecked`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.from_encoded_bytes_unchecked) - [`std::ffi::OsString::into_encoded_bytes`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.into_encoded_bytes) - [`std::ffi::OsStr::from_encoded_bytes_unchecked`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.from_encoded_bytes_unchecked) - [`std::ffi::OsStr::as_encoded_bytes`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.as_encoded_bytes) - [`std::io::Error::other`] (https://doc.rust-lang.org/stable/std/io/struct.Error.html#method.other) - [`impl TryFrom<char> for u16`] (https://doc.rust-lang.org/stable/std/primitive.u16.html#impl-TryFrom%3Cchar%3E-for-u16) - [`impl<T: Clone, const N: usize> From<&[T; N]> for Vec<T>`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#impl-From%3C%26%5BT;+N%5D%3E-for-Vec%3CT,+Global%3E) - [`impl<T: Clone, const N: usize> From<&mut [T; N]> for Vec<T>`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#impl-From%3C%26mut+%5BT;+N%5D%3E-for-Vec%3CT,+Global%3E) - [`impl<T, const N: usize> From<[T; N]> for Arc<[T]>`] (https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3C%5BT;+N%5D%3E-for-Arc%3C%5BT%5D,+Global%3E) - [`impl<T, const N: usize> From<[T; N]> for Rc<[T]>`] (https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3C%5BT;+N%5D%3E-for-Rc%3C%5BT%5D,+Global%3E) These APIs are now stable in const contexts: - [`core::mem::transmute_copy`] (https://doc.rust-lang.org/beta/std/mem/fn.transmute_copy.html) - [`str::is_ascii`] (https://doc.rust-lang.org/beta/std/primitive.str.html#method.is_ascii) - [`[u8]::is_ascii`] (https://doc.rust-lang.org/beta/std/primitive.slice.html#method.is_ascii) Cargo ----- - [fix: Set MSRV for internal packages] (rust-lang/cargo#12381) - [config: merge lists in precedence order] (rust-lang/cargo#12515) - [fix(update): Clarify meaning of --aggressive as --recursive] (rust-lang/cargo#12544) - [fix(update): Make `-p` more convenient by being positional] (rust-lang/cargo#12545) - [feat(help): Add styling to help output ] (rust-lang/cargo#12578) - [feat(pkgid): Allow incomplete versions when unambigious] (rust-lang/cargo#12614) - [feat: stabilize credential-process and registry-auth] (rust-lang/cargo#12649) - [feat(cli): Add '-n' to dry-run] (rust-lang/cargo#12660) - [Add support for `target.'cfg(..)'.linker`] (rust-lang/cargo#12535) - [Stabilize `--keep-going`] (rust-lang/cargo#12568) - [feat: Stabilize lints] (rust-lang/cargo#12648) Rustdoc ------- - [Add warning block support in rustdoc] (rust-lang/rust#106561) - [Accept additional user-defined syntax classes in fenced code blocks] (rust-lang/rust#110800) - [rustdoc-search: add support for type parameters] (rust-lang/rust#112725) - [rustdoc: show inner enum and struct in type definition for concrete type] (rust-lang/rust#114855) Compatibility Notes ------------------- - [Raise minimum supported Apple OS versions] (rust-lang/rust#104385) - [make Cell::swap panic if the Cells partially overlap] (rust-lang/rust#114795) - [Reject invalid crate names in `--extern`] (rust-lang/rust#116001) - [Don't resolve generic impls that may be shadowed by dyn built-in impls] (rust-lang/rust#114941) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. None this cycle.

…i-obk closure field capturing: don't depend on alignment of packed fields This fixes the closure field capture part of rust-lang/rust#115305: field capturing always stops at projections into packed structs, no matter the alignment of the field. This means changing a private field type from `u8` to `u64` can never change how closures capture fields, which is probably what we want. Here's an example where, before this PR, changing the type of a private field in a repr(Rust) struct can change the output of a program: ```rust #![allow(dead_code)] mod m { // before patch #[derive(Default)] pub struct S1(u8); // after patch #[derive(Default)] pub struct S2(u64); } struct NoisyDrop; impl Drop for NoisyDrop { fn drop(&mut self) { eprintln!("dropped!"); } } #[repr(packed)] struct MyType { field: m::S1, // output changes when this becomes S2 other_field: NoisyDrop, third_field: Vec<()>, } fn test(r: MyType) { let c = || { let _val = std::ptr::addr_of!(r.field); let _val = r.third_field; }; drop(c); eprintln!("before dropping"); } fn main() { test(MyType { field: Default::default(), other_field: NoisyDrop, third_field: Vec::new(), }); } ``` Of course this is a breaking change for the same reason that doing field capturing in the first place was a breaking change. Packed fields are relatively rare and depending on drop order is relatively rare, so I don't expect this to have much impact, but it's hard to be sure and even a crater run will only tell us so much. Also see the [nomination comment](rust-lang/rust#115315 (comment)). Cc `@rust-lang/wg-rfc-2229` `@ehuss`

rustbot assigned petrochenkov Aug 28, 2023

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 Aug 28, 2023

RalfJung force-pushed the field-capture-packed-alignment branch from cbbb044 to e17af73 Compare August 28, 2023 13:46

RalfJung mentioned this pull request Aug 28, 2023

Handling of packed fields causes semver hazard: layout details from other crates affect type-checking #115305

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craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 28, 2023

closure field capturing: don't depend on alignment of packed fields

a671127

RalfJung force-pushed the field-capture-packed-alignment branch from e17af73 to a671127 Compare August 28, 2023 16:25

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bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Sep 16, 2023

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bors merged commit 790309b into rust-lang:master Sep 16, 2023
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RalfJung deleted the field-capture-packed-alignment branch September 16, 2023 20:38

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ehuss mentioned this pull request Jul 8, 2024

Update closures for edition 2021 disjoint closure capturing rust-lang/reference#1521

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closure field capturing: don't depend on alignment of packed fields #115315

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closure field capturing: don't depend on alignment of packed fields #115315

closure field capturing: don't depend on alignment of packed fields #115315

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Overall result: no relevant changes - no action needed

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