define copy_within on slices #53652

oconnor663 · 2018-08-23T23:45:12Z

This is a safe wrapper around ptr::copy, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of Vec::drain.

I've wanted this API a couple times in the past, and I figured I'd just whip up a PR to help discuss it. It's possible something like this exists elsewhere and I just missed it. It might also be a big enough addition to warrant an RFC, I'm not sure.

rust-highfive · 2018-08-23T23:45:15Z

r? @Kimundi

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rust-highfive · 2018-08-24T00:54:23Z

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:47:45] ....................................................................................................
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[01:06:16] failures:
[01:06:16] 
[01:06:16] ---- slice/mod.rs - slice::[T]::copy_in_place (line 1640) stdout ----
[01:06:16] ---- slice/mod.rs - slice::[T]::copy_in_place (line 1640) stdout ----
[01:06:16] error[E0658]: use of unstable library feature 'copy_in_place' (see issue #53652)
[01:06:16]  --> slice/mod.rs:1643:7
[01:06:16]   |
[01:06:16] 6 | slice.copy_in_place(1, 0, 2);
[01:06:16]   |
[01:06:16]   |
[01:06:16]   = help: add #![feature(copy_in_place)] to the crate attributes to enable
[01:06:16] thread 'slice/mod.rs - slice::[T]::copy_in_place (line 1640)' panicked at 'couldn't compile the test', librustdoc/test.rs:333:13
[01:06:16] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[01:06:16] 
[01:06:16] 
---
[01:06:16] 
[01:06:16] error: test failed, to rerun pass '--doc'
[01:06:16] 
[01:06:16] 
[01:06:16] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "x86_64-unknown-linux-gnu" "-j" "4" "--release" "--locked" "--color" "always" "--features" "panic-unwind jemalloc backtrace" "--manifest-path" "/checkout/src/libstd/Cargo.toml" "-p" "core" "--" "--quiet"
[01:06:16] 
[01:06:16] 
[01:06:16] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[01:06:16] Build completed unsuccessfully in 0:22:34
[01:06:16] Build completed unsuccessfully in 0:22:34
[01:06:16] make: *** [check] Error 1
travis_time:end:00b5a7e0:start=1535068081050544893,finish=1535072057765353580,duration=3976714808687

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:000ec932

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

oconnor663 · 2018-08-24T02:22:43Z

I added /// # #![feature(copy_in_place)] to the doc example to hopefully fix that build break, and I tweaked the example itself to hopefully be a little clearer.

BurntPizza · 2018-08-24T04:13:00Z

Seems like it needs get_unchecked* to get rid of the bounds checks despite the asserts, unless I'm missing something and that's not safe: https://godbolt.org/z/W3m1kv

oconnor663 · 2018-08-24T06:43:27Z

@BurntPizza thanks for catching that. I've amended and rebased.

oconnor663 · 2018-08-24T16:14:44Z

Safety question not necessarily specific to this PR: Indexing into a slice relies on ptr::offset, which says that its UB to use an offset/index larger than isize::MAX. As documented by ptr::offset, "memory acquired directly from allocators or memory mapped files may be too large to handle with this function." Does that mean that memory mapping a file larger than isize::MAX is unsound, because safe code can cause UB just by indexing into it? (Edit: I split this out into #53676.)

oconnor663 · 2018-08-26T05:46:43Z

I've published this function as a standalone crate in the meantime: https://crates.io/crates/copy_in_place

TimNN · 2018-09-04T17:28:36Z

Ping from triage @Kimundi / @rust-lang/libs: This PR requires your review.

alexcrichton · 2018-09-05T21:22:49Z

Thanks for the PR! The API here looks pretty good to me, although I might suggest copy_within perhaps to bikeshed the name? Other than that though with a tracking issue I think this should be good to go

SimonSapin · 2018-09-05T21:53:19Z

bytes.copy_in_place(1, 8, 4)

With three usize arguments I feel like I’d need to look up the docs every time in order to figure out which argument is which and what this call does. Maybe range syntax could make calls clearer?

pub fn copy_in_place(&mut self, src: Range<usize>, dest: RangeFrom<usize>) where T: Copy {
   assert!(src.end >= src.start);
   let count = src.end - src.start;
   // …
}

bytes.copy_in_place(1..5, 8..)

oconnor663 · 2018-09-06T18:44:23Z

The name: I noticed there was some precedent along the lines of drop_in_place and grow_in_place in the standard library. Otherwise I don't have any strong feelings.

The API: Agreed that it's hard to remember. I think the one major advantage that the current approach has going for it is that it's a pretty direct clone of ptr::copy(src, dest, count). I didn't think about using ranges before, but I wonder if that would lead users to expect that other types of ranges would work. If not, it could be a little frustrating. But if so, it could lead to other types of confusion, for example slice.copy_in_place(i.., j..) (the first presumably ending at the end of the slice, and the second then taking the length of the first, which isn't clear just from looking at it). One of the design thoughts I had, which you preserved, was to leave no room in the API to specify regions of different sizes, and so no need to check that particular condition and panic. But if we were willing to relax that, we could say template on any arg types implementing std::ops::RangeBounds. Upsides: Very easy to remember how to call. Downsides: Noisier to read if the caller is starting with a count and needs to compute both range ends. Also possibly more overhead if it's being called inside an exceptionally tight loop.

Tracking issue: @alexcrichton how does that work? Would I file one, or would someone on the core team? Before or after this PR lands?

oconnor663 · 2018-09-06T18:50:12Z

I guess another option would be to define some kind of arg struct, so that the caller is forced to name each field that it's passing in. That could help readability, but I don't know if there's precedent for it in the standard library. It would also be unnecessarily verbose in the case where the caller already has variables with decent names.

Or perhaps the src and dest args could live in a tuple, just to set them apart? That would be kind of quirky though.

SimonSapin · 2018-09-07T07:57:15Z

it's a pretty direct clone of ptr::copy(src, dest, count)

But ptr::copy has different types of arguments (two pointers and an integer), which conveys information about which argument is which. Compare copy(a.as_ptr(), b.as_mut_ptr(), 4) v.s. copy_in_place(1, 8, 4).

Regarding a generic parameter with RangeBounds, maybe only for src?

oconnor663 · 2018-09-10T14:29:53Z

I opened a PR on my crate implementation to take a look at what a range argument would look like. It seems viable. The upside is that the argument type's a lot more visible. The downside is that a caller with a count instead of a src_end needs to do one extra math step before calling (though this counts as an upside too if you already have a src_end, so maybe a wash). Also there's one more way to panic, if you supply an inverted range.

oconnor663 · 2018-09-12T19:17:43Z

@alexcrichton could you say more about how tracking issues work? Should I file one now, or wait until we have a little more consensus on the API here?

alexcrichton · 2018-09-13T22:20:26Z

@oconnor663 oh sure yeah, so for us a tracking issue is created whenever we merge an unstable feature. So to land this PR we'll want a tracking issue which lists out the various design questions and such.

oconnor663 · 2018-09-14T19:28:19Z

I've opened a tracking issue (#54236), updated the issue number referenced inline in this PR, and rebased.

scottmcm · 2018-09-17T04:28:57Z

src/libcore/slice/mod.rs

+        assert!(dest <= self.len() - count);
+        unsafe {
+            let src_ptr = self.get_unchecked(src) as *const T;
+            let dest_ptr = self.get_unchecked_mut(dest) as *mut T;


nit: You shouldn't need to cast these; they'll coerce just fine.

I think without the casts this fails the borrow checker.

Ah, yes, you're of course right. I was thinking of when they're not in variables:

ptr::copy( slice.get_unchecked(src), slice.get_unchecked_mut(dest), count, );

Oh gotcha. Do you think that version would be better style? I'd be happy with either.

I have no strong opinion, other than that I do like avoiding as, especially to *mut.

Maybe keep the variables, but coerce instead of casting?

let src_ptr: *const T = self.get_unchecked(src); let dest_ptr: *mut T = self.get_unchecked_mut(dest);

scottmcm · 2018-09-17T04:32:37Z

Previously, safe in-place copying was only available as a side effect of Vec::drain.

Would we only suggest this when things can overlap? Or would this replace using split_at_mut when the sides cannot overlap? If I'm reading it right, the one example in the docs doesn't need this method:

let (a, b) = bytes.split_at_mut(8);
b[..4].copy_from_slice(a[1..5]);

oconnor663 · 2018-09-17T05:24:30Z

Would we only suggest this when things can overlap?

I'm not sure. On the one hand, the two-liner above would become a one-liner:

bytes.copy_in_place(9, 0, 4);

// Or with the API SimonSapin suggested:
bytes.copy_in_place(9..13, 0);

On the other hand, I think copy_from_slice gets turned into a ptr::copy_nonoverlapping, which might have slightly better performance than ptr::copy. Is that a meaningful difference, in the disjoint case where both approaches are possible? Maybe someone who knows more about those perf details can weigh in.

oconnor663 · 2018-09-17T21:23:18Z

I've gotten rid of pointer casts as @scottmcm suggested, switched to @SimonSapin's suggested API, and rebased again.

rust-highfive · 2018-09-17T21:49:07Z

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.


[00:06:27] travis_fold:start:tidy
travis_time:start:tidy
tidy check
[00:06:27] tidy error: /checkout/src/libcore/slice/mod.rs:1647: line longer than 100 chars
[00:06:27] tidy error: /checkout/src/libcore/slice/mod.rs:1650: line longer than 100 chars
[00:06:27] tidy error: /checkout/src/libcore/slice/mod.rs:1654: line longer than 100 chars
[00:06:28] some tidy checks failed
[00:06:28] 
[00:06:28] 
[00:06:28] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor" "--quiet"
[00:06:28] 
[00:06:28] 
[00:06:28] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
[00:06:28] Build completed unsuccessfully in 0:00:49
[00:06:28] Build completed unsuccessfully in 0:00:49
[00:06:28] Makefile:79: recipe for target 'tidy' failed
[00:06:28] make: *** [tidy] Error 1

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:10bc0222
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)
---
travis_time:end:004e1dac:start=1537219812203413386,finish=1537219812208174642,duration=4761256
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$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
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$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
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$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

alexcrichton · 2018-09-18T00:34:27Z

Looks good to me! I think there's some tidy/style issues though?

oconnor663 · 2018-09-18T01:49:54Z

Line length should be fixed now.

rust-highfive · 2018-09-18T03:07:50Z

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

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/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading https://files.pythonhosted.org/packages/f8/ab/ab7b15a7a5524f47bb39279a59a7afdb1237162159ba7ff15cab28c96915/awscli-1.16.15-py2.py3-none-any.whl (1.3MB)
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131200 ./obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release
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129776 ./obj/build/x86_64-unknown-linux-gnu/stage0-bootstrap-tools/x86_64-unknown-linux-gnu/release

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oconnor663 · 2018-09-18T05:30:26Z

Very silly copy-paste-o on my part. Should be fixed. I also decided I like @alexcrichton's name suggestion copy_within more, so I'm going with that for now.

alexcrichton · 2018-09-18T22:01:55Z

Thanks! Sorry I forgot to mention earlier, but could some semi-exhaustive tests be added for this as well? With unsafe in play it's always good to have a good suite of tests to handle issues!

This is a safe wrapper around ptr::copy, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of Vec::drain.

oconnor663 · 2018-09-20T05:59:51Z

I've added some tests, which are hopefully about to pass Travis. I could add more?

alexcrichton · 2018-09-20T16:49:11Z

@bors: r+

Thanks!

bors · 2018-09-20T16:49:12Z

📌 Commit d0e59f5 has been approved by alexcrichton

…chton define copy_within on slices This is a safe wrapper around `ptr::copy`, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of `Vec::drain`. I've wanted this API a couple times in the past, and I figured I'd just whip up a PR to help discuss it. It's possible something like this exists elsewhere and I just missed it. It might also be a big enough addition to warrant an RFC, I'm not sure.

Rollup of 10 pull requests Successful merges: - #53652 (define copy_within on slices) - #54261 (Make `dyn` a keyword in the 2018 edition) - #54317 (Implement the dbg!(..) macro) - #54323 (rustbuild: drop color handling) - #54371 (add -Zui-testing to rustdoc) - #54374 (Make 'proc_macro::MultiSpan' public.) - #54402 (Use no_default_libraries for all NetBSD flavors) - #54412 (add applicability to span_suggestion call) - #54413 (Add UI test for deref recursion limit printing twice) - #54422 (Simplify slice's first(_mut) and last(_mut) with get)

…chton define copy_within on slices This is a safe wrapper around `ptr::copy`, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of `Vec::drain`. I've wanted this API a couple times in the past, and I figured I'd just whip up a PR to help discuss it. It's possible something like this exists elsewhere and I just missed it. It might also be a big enough addition to warrant an RFC, I'm not sure.

@ghost

Rollup of 16 pull requests Successful merges: - #53652 (define copy_within on slices) - #54261 (Make `dyn` a keyword in the 2018 edition) - #54280 (remove (more) CAS API from Atomic* types where not natively supported) - #54323 (rustbuild: drop color handling) - #54350 (Support specifying edition in doc test) - #54370 (Improve handling of type bounds in `bit_set.rs`.) - #54371 (add -Zui-testing to rustdoc) - #54374 (Make 'proc_macro::MultiSpan' public.) - #54402 (Use no_default_libraries for all NetBSD flavors) - #54409 (Detect `for _ in in bar {}` typo) - #54412 (add applicability to span_suggestion call) - #54413 (Add UI test for deref recursion limit printing twice) - #54415 (parser: Tweak function parameter parsing to avoid rollback on succesfull path) - #54420 (Compress `Liveness` data some more.) - #54422 (Simplify slice's first(_mut) and last(_mut) with get) - #54446 (Unify christianpoveda's emails) Failed merges: - #54058 (Introduce the partition_dedup/by/by_key methods for slices) r? @ghost

@ghost

Rollup of 16 pull requests Successful merges: - #53652 (define copy_within on slices) - #54261 (Make `dyn` a keyword in the 2018 edition) - #54280 (remove (more) CAS API from Atomic* types where not natively supported) - #54323 (rustbuild: drop color handling) - #54350 (Support specifying edition in doc test) - #54370 (Improve handling of type bounds in `bit_set.rs`.) - #54371 (add -Zui-testing to rustdoc) - #54374 (Make 'proc_macro::MultiSpan' public.) - #54402 (Use no_default_libraries for all NetBSD flavors) - #54409 (Detect `for _ in in bar {}` typo) - #54412 (add applicability to span_suggestion call) - #54413 (Add UI test for deref recursion limit printing twice) - #54415 (parser: Tweak function parameter parsing to avoid rollback on succesfull path) - #54420 (Compress `Liveness` data some more.) - #54422 (Simplify slice's first(_mut) and last(_mut) with get) - #54446 (Unify christianpoveda's emails) Failed merges: - #54058 (Introduce the partition_dedup/by/by_key methods for slices) r? @ghost

rust-highfive assigned Kimundi Aug 23, 2018

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Aug 23, 2018

oconnor663 force-pushed the copy_in_place branch from 6f3ee2d to 063bfa7 Compare August 23, 2018 23:45

oconnor663 force-pushed the copy_in_place branch from 063bfa7 to cd69d40 Compare August 24, 2018 02:21

oconnor663 force-pushed the copy_in_place branch from cd69d40 to 3c5de8e Compare August 24, 2018 06:42

oconnor663 force-pushed the copy_in_place branch from 3c5de8e to 76e3653 Compare August 24, 2018 06:55

oconnor663 force-pushed the copy_in_place branch from 76e3653 to bda5237 Compare August 26, 2018 05:27

oconnor663 mentioned this pull request Sep 10, 2018

make src into a range and get rid of count oconnor663/copy_in_place#1

Merged

oconnor663 mentioned this pull request Sep 14, 2018

Tracking issue for copy_within #54236

Closed

4 tasks

oconnor663 force-pushed the copy_in_place branch from bda5237 to c4ec3ae Compare September 14, 2018 19:27

scottmcm reviewed Sep 17, 2018

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oconnor663 force-pushed the copy_in_place branch from c4ec3ae to cd4de8f Compare September 17, 2018 21:22

oconnor663 force-pushed the copy_in_place branch from cd4de8f to 7dd3a24 Compare September 18, 2018 01:49

oconnor663 force-pushed the copy_in_place branch from 7dd3a24 to 0cc47aa Compare September 18, 2018 05:28

oconnor663 changed the title ~~define copy_in_place on slices~~ define copy_within on slices Sep 18, 2018

oconnor663 force-pushed the copy_in_place branch from 0cc47aa to 9e73b45 Compare September 18, 2018 17:09

define copy_within on slices

b3ffd33

This is a safe wrapper around ptr::copy, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of Vec::drain.

oconnor663 force-pushed the copy_in_place branch from 8037329 to bf834cc Compare September 20, 2018 04:57

add tests for copy_within

d0e59f5

oconnor663 force-pushed the copy_in_place branch from bf834cc to d0e59f5 Compare September 20, 2018 06:35

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 Sep 20, 2018

kennytm mentioned this pull request Sep 21, 2018

Rollup of 10 pull requests #54432

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pietroalbini mentioned this pull request Sep 22, 2018

Rollup of 16 pull requests #54457

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bors merged commit d0e59f5 into rust-lang:master Sep 22, 2018

kennytm mentioned this pull request May 31, 2019

Stabilize copy_within #61398

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define copy_within on slices #53652

define copy_within on slices #53652

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oconnor663 commented Aug 24, 2018 •

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oconnor663 commented Sep 6, 2018 •

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oconnor663 commented Sep 6, 2018 •

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