Always mark rust and rust-call abi's as unwind #65020

pnkfelix · 2019-10-02T19:59:20Z

PR #63909 identified a bug that had been injected by PR #55982. As discussed on #64655 (comment) , we started marking extern items as nounwind, even extern items that said they were using "Rust" or "rust-call" ABI.

This is a more targeted variant of PR #63909 that fixes the above bug.

Fix #64655

I personally suspect we will want PR #63909 to land in the long-term

But:

it is not certain that PR fix nounwind attribute logic #63909 will land,
more importantly, PR fix nounwind attribute logic #63909 almost certainly will not be backported to beta/stable.

The identified bug was more severe than I think anyone realized (apart from perhaps @gnzlbg, as noted here).

Thus, I was motivated to write this PR, which fixes just the issue with extern rust/rust-call functions, and deliberately avoids injecting further deviation from current behavior (you can see further notes on this in the comments of the code added here).

rust-highfive · 2019-10-02T19:59:24Z

r? @cramertj

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pnkfelix · 2019-10-02T20:00:53Z

nominating for beta backport once/if this actually lands.

src/librustc_codegen_llvm/attributes.rs

src/test/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs

src/test/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs

rust-highfive · 2019-10-02T20:37:56Z

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, 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.

2019-10-02T20:17:26.1669931Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-02T20:17:26.1962104Z ##[command]git config gc.auto 0
2019-10-02T20:17:26.2062446Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-02T20:17:26.2585518Z ##[command]git config --get-all http.proxy
2019-10-02T20:17:26.2787848Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/65020/merge:refs/remotes/pull/65020/merge
---
2019-10-02T20:24:38.4474612Z    Compiling serde_json v1.0.40
2019-10-02T20:24:40.4086005Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-10-02T20:24:52.4823649Z     Finished release [optimized] target(s) in 1m 36s
2019-10-02T20:24:52.4915599Z tidy check
2019-10-02T20:24:52.8055282Z tidy error: /checkout/src/test/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs: too many trailing newlines (2)
2019-10-02T20:24:54.5863050Z some tidy checks failed
2019-10-02T20:24:54.5865905Z 
2019-10-02T20:24:54.5865905Z 
2019-10-02T20:24:54.5867266Z 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"
2019-10-02T20:24:54.5867953Z 
2019-10-02T20:24:54.5868228Z 
2019-10-02T20:24:54.5873349Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-10-02T20:24:54.5873690Z Build completed unsuccessfully in 0:01:40
2019-10-02T20:24:54.5873690Z Build completed unsuccessfully in 0:01:40
2019-10-02T20:24:54.5932743Z == clock drift check ==
2019-10-02T20:24:54.5946382Z   local time: Wed Oct  2 20:24:54 UTC 2019
2019-10-02T20:24:54.6663343Z   network time: Wed, 02 Oct 2019 20:24:54 GMT
2019-10-02T20:24:54.6670013Z == end clock drift check ==
2019-10-02T20:24:56.0475069Z ##[error]Bash exited with code '1'.
2019-10-02T20:24:56.0511872Z ##[section]Starting: Checkout
2019-10-02T20:24:56.0514681Z ==============================================================================
2019-10-02T20:24:56.0514760Z Task         : Get sources
2019-10-02T20:24:56.0514809Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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)

cramertj · 2019-10-02T20:38:24Z

r? @alexcrichton

alexcrichton · 2019-10-02T23:31:41Z

r=me on this, thanks for the clear PR description and the clear comments in the code!

src/librustc_codegen_llvm/attributes.rs

RalfJung · 2019-10-03T02:05:13Z

Funny, I just today talked with @nikomatsakis about this. ;)

Yes, this PR is certainly a step in the right direction. I was not expecting my PR to be that controversial; that's the only reason why I did not split out this change to begin with.

Co-Authored-By: Mazdak Farrokhzad <[email protected]> Co-Authored-By: Ralf Jung <[email protected]>

rust-highfive · 2019-10-03T09:06:18Z

The job x86_64-gnu-llvm-6.0 of your PR failed (pretty log, 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.

2019-10-03T08:46:38.2947498Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-10-03T08:46:38.3149143Z ##[command]git config gc.auto 0
2019-10-03T08:46:38.3214588Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-10-03T08:46:38.3263542Z ##[command]git config --get-all http.proxy
2019-10-03T08:46:38.3424795Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/65020/merge:refs/remotes/pull/65020/merge
---
2019-10-03T08:53:38.3438362Z    Compiling serde_json v1.0.40
2019-10-03T08:53:40.1489854Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-10-03T08:53:51.4231551Z     Finished release [optimized] target(s) in 1m 30s
2019-10-03T08:53:51.4322676Z tidy check
2019-10-03T08:53:51.7129818Z tidy error: /checkout/src/test/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs: too many trailing newlines (2)
2019-10-03T08:53:53.4046066Z some tidy checks failed
2019-10-03T08:53:53.4051240Z 
2019-10-03T08:53:53.4051240Z 
2019-10-03T08:53:53.4052413Z 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"
2019-10-03T08:53:53.4053051Z 
2019-10-03T08:53:53.4053252Z 
2019-10-03T08:53:53.4058503Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-10-03T08:53:53.4058890Z Build completed unsuccessfully in 0:01:33
2019-10-03T08:53:53.4058890Z Build completed unsuccessfully in 0:01:33
2019-10-03T08:53:53.4111242Z == clock drift check ==
2019-10-03T08:53:53.4126455Z   local time: Thu Oct  3 08:53:53 UTC 2019
2019-10-03T08:53:53.5754572Z   network time: Thu, 03 Oct 2019 08:53:53 GMT
2019-10-03T08:53:53.5756887Z == end clock drift check ==
2019-10-03T08:53:54.9567336Z ##[error]Bash exited with code '1'.
2019-10-03T08:53:54.9598965Z ##[section]Starting: Checkout
2019-10-03T08:53:54.9601198Z ==============================================================================
2019-10-03T08:53:54.9601256Z Task         : Get sources
2019-10-03T08:53:54.9601303Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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)

Some comment refinements inspired by review feedback.

placate tidy

pnkfelix · 2019-10-03T11:13:45Z

@bors r=alexcrichton

bors · 2019-10-03T11:13:47Z

📌 Commit 71e5f78 has been approved by alexcrichton

nagisa · 2019-10-03T14:09:35Z

This needs a codegen test to verify that we never generate nounwind for extern calls like those.

pnkfelix · 2019-10-03T18:30:06Z

This needs a codegen test to verify that we never generate nounwind for extern calls like those.

(I will do this in a follow-up PR.)

RalfJung · 2019-10-11T12:58:46Z

Ah, missed another test.

@bors r=alexcrichton

bors · 2019-10-11T12:58:47Z

📌 Commit 028f53e has been approved by alexcrichton

bors · 2019-10-11T21:36:00Z

⌛ Testing commit 028f53e with merge d3077a768c8c64752034e2814c42ac030ec4bf25...

tmandry · 2019-10-11T22:12:06Z

@bors retry yielding to rollup

bors · 2019-10-12T02:31:10Z

⌛ Testing commit 028f53e with merge 4b42e91...

@gnzlbg

…-abi-unwind-issue-64655, r=alexcrichton Always mark rust and rust-call abi's as unwind PR #63909 identified a bug that had been injected by PR #55982. As discussed on #64655 (comment) , we started marking extern items as nounwind, *even* extern items that said they were using "Rust" or "rust-call" ABI. This is a more targeted variant of PR #63909 that fixes the above bug. Fix #64655 ---- I personally suspect we will want PR #63909 to land in the long-term But: * it is not certain that PR #63909 *will* land, * more importantly, PR #63909 almost certainly will not be backported to beta/stable. The identified bug was more severe than I think anyone realized (apart from perhaps @gnzlbg, as noted [here](#63909 (comment))). Thus, I was motivated to write this PR, which fixes *just* the issue with extern rust/rust-call functions, and deliberately avoids injecting further deviation from current behavior (you can see further notes on this in the comments of the code added here).

bors · 2019-10-12T06:24:59Z

☀️ Test successful - checks-azure
Approved by: alexcrichton
Pushing 4b42e91 to master...

@pnkfelix

nounwind tests and cleanup This is a follow-up to @pnkfelix' rust-lang#65020. In particular it adds some tests as @nagisa asked. It also does a cleanup that the original PR omitted to reduce backporting risks. I hope I finally managed to write an uncontroversial PR in this area. ;) This should not change any behavior, just test it better.

@pnkfelix

nounwind tests and cleanup This is a follow-up to @pnkfelix' rust-lang#65020. In particular it adds some tests as @nagisa asked. It also does a cleanup that the original PR omitted to reduce backporting risks. I hope I finally managed to write an uncontroversial PR in this area. ;) This should not change any behavior, just test it better.

@gnzlbg

…king-rust-abi-unwind-issue-64655, r=alexcrichton Always mark rust and rust-call abi's as unwind PR rust-lang#63909 identified a bug that had been injected by PR rust-lang#55982. As discussed on rust-lang#64655 (comment) , we started marking extern items as nounwind, *even* extern items that said they were using "Rust" or "rust-call" ABI. This is a more targeted variant of PR rust-lang#63909 that fixes the above bug. Fix rust-lang#64655 ---- I personally suspect we will want PR rust-lang#63909 to land in the long-term But: * it is not certain that PR rust-lang#63909 *will* land, * more importantly, PR rust-lang#63909 almost certainly will not be backported to beta/stable. The identified bug was more severe than I think anyone realized (apart from perhaps @gnzlbg, as noted [here](rust-lang#63909 (comment))). Thus, I was motivated to write this PR, which fixes *just* the issue with extern rust/rust-call functions, and deliberately avoids injecting further deviation from current behavior (you can see further notes on this in the comments of the code added here).

[beta] backport rollup This includes a bunch of PRs: * Fix redundant semicolon lint interaction with proc macro attributes #64387 * Upgrade async/await to "used" keywords. #64875 * syntax: fix dropping of attribute on first param of non-method assocated fn #64894 * async/await: improve not-send errors #64895 * Silence unreachable code lint from await desugaring #64930 * Always mark rust and rust-call abi's as unwind #65020 * Account for macro invocation in `let mut $pat` diagnostic. #65123 * Ensure that associated `async fn`s have unique fresh param names #65142 * Add troubleshooting section to PGO chapter in rustc book. #65402 * Upgrade GCC to 8.3.0, glibc to 1.17.0 and crosstool-ng to 1.24.0 for dist-armv7-linux #65302 * Optimize `try_expand_impl_trait_type` #65293 * use precalculated dominators in explain_borrow #65172 * Fix ICE #64964 #64989

[beta] backport rollup This includes a bunch of PRs: * Fix redundant semicolon lint interaction with proc macro attributes #64387 * Upgrade async/await to "used" keywords. #64875 * syntax: fix dropping of attribute on first param of non-method assocated fn #64894 * async/await: improve not-send errors #64895 * Silence unreachable code lint from await desugaring #64930 * Always mark rust and rust-call abi's as unwind #65020 * Account for macro invocation in `let mut $pat` diagnostic. #65123 * Ensure that associated `async fn`s have unique fresh param names #65142 * Add troubleshooting section to PGO chapter in rustc book. #65402 * Upgrade GCC to 8.3.0, glibc to 1.17.0 and crosstool-ng to 1.24.0 for dist-armv7-linux #65302 * Optimize `try_expand_impl_trait_type` #65293 * use precalculated dominators in explain_borrow #65172 * Fix ICE #64964 #64989 * [beta] Revert "Auto merge of #62948 - matklad:failable-file-loading, r=petro… #65273 * save-analysis: Don't ICE when resolving qualified type paths in struct members #65353 * save-analysis: Nest tables when processing impl block definitions #65511 * Avoid ICE when checking `Destination` of `break` inside a closure #65518 * Avoid ICE when adjusting bad self ty #65755 * workaround msys2 bug #65762

pnkfelix added 2 commits October 2, 2019 21:52

Fix missing calls to drop on unwind with lto=fat; issue 64655.

9fbb2a9

Regression tests for issue 64655.

a371972

rust-highfive assigned cramertj Oct 2, 2019

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 2, 2019

pnkfelix changed the title ~~Always marking rust and rust-call abi's as unwind~~ Always mark rust and rust-call abi's as unwind Oct 2, 2019

pnkfelix added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Oct 2, 2019

pnkfelix added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Oct 2, 2019

fix typo

3adcc3e

Centril reviewed Oct 2, 2019

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rust-highfive assigned alexcrichton and unassigned cramertj Oct 2, 2019

RalfJung reviewed Oct 3, 2019

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Co-Authored-By: Mazdak Farrokhzad <[email protected]> Co-Authored-By: Ralf Jung <[email protected]>

pnkfelix added 2 commits October 3, 2019 11:08

Update attributes.rs

5e7e8cd

Some comment refinements inspired by review feedback.

Update issue-64655-extern-rust-must-allow-unwind.rs

71e5f78

placate tidy

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 Oct 3, 2019

emcscripten: ignore another thread-using test

028f53e

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 Oct 11, 2019

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 12, 2019

bors merged commit 028f53e into rust-lang:master Oct 12, 2019

RalfJung mentioned this pull request Oct 12, 2019

nounwind tests and cleanup #65346

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[beta] backport rollup #65708

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Always mark rust and rust-call abi's as unwind #65020

Always mark rust and rust-call abi's as unwind #65020

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Always mark rust and rust-call abi's as unwind #65020

Always mark rust and rust-call abi's as unwind #65020

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