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rustdoc: Fix ICE report #92310

Merged
merged 1 commit into from
Feb 3, 2022
Merged

rustdoc: Fix ICE report #92310

merged 1 commit into from
Feb 3, 2022

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ehuss
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@ehuss ehuss commented Dec 27, 2021

The ICE report in rustdoc was confusing because it was returning an argument parse error:

thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

error: Unrecognized option: 'crate-version'

This is because the ICE reporter was trying to parse the arguments as rustc, not rustdoc. Since an argument error is a fatal error, it was early-exiting with the argument error due to unwinding.

This changes it to be a more primitive scan of the arguments. The arguments being checked are pretty simple, and only have a small handful of forms that are easy to check for.

It now looks like this:

thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.59.0-dev running on x86_64-apple-darwin

note: compiler flags: --crate-type lib -Z treat-err-as-bug

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack

It still says rustc, but I can live with that.

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r? @estebank

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@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Dec 27, 2021
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 27, 2021
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camelid commented Dec 27, 2021

I'd always wondered why it reported an argument error...

@JohnCSimon JohnCSimon added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 23, 2022
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ijackson commented Feb 2, 2022

Ah, cool, the strange behaviour in #93579 is explained :-). Thanks for fixing.

@estebank
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estebank commented Feb 2, 2022

@bors r+

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bors commented Feb 2, 2022

📌 Commit 4413141 has been approved by estebank

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 2, 2022
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Feb 3, 2022
rustdoc: Fix ICE report

The ICE report in rustdoc was confusing because it was returning an argument parse error:

```
thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

error: Unrecognized option: 'crate-version'
```

This is because the ICE reporter was trying to parse the arguments as rustc, not rustdoc.  Since an argument error is a fatal error, it was early-exiting with the argument error due to unwinding.

This changes it to be a more primitive scan of the arguments. The arguments being checked are pretty simple, and only have a small handful of forms that are easy to check for.

It now looks like this:

```
thread 'rustc' panicked at 'aborting due to `-Z treat-err-as-bug=1`', compiler/rustc_errors/src/lib.rs:1212:27
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.59.0-dev running on x86_64-apple-darwin

note: compiler flags: --crate-type lib -Z treat-err-as-bug

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
```

It still says `rustc`, but I can live with that.
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 3, 2022
Rollup of 7 pull requests

Successful merges:

 - rust-lang#92310 (rustdoc: Fix ICE report)
 - rust-lang#92802 (Deduplicate lines in long const-eval stack trace)
 - rust-lang#93515 (Factor convenience functions out of main printer implementation)
 - rust-lang#93566 (Make rustc use `RUST_BACKTRACE=full` by default)
 - rust-lang#93589 (Use Option::then in two places)
 - rust-lang#93600 (fix: Remove extra newlines from junit output)
 - rust-lang#93606 (Correct incorrect description of preorder traversals)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
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bors commented Feb 3, 2022

⌛ Testing commit 4413141 with merge 4e8fb74...

@bors bors merged commit 9298bd8 into rust-lang:master Feb 3, 2022
@rustbot rustbot added this to the 1.60.0 milestone Feb 3, 2022
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Sep 10, 2022
Fix ICE report flags display.

rust-lang#92310 made some changes to the ICE report that displays the rustc flags, but it introduced a bug where a flag like `-Z incremental-verify-ich=yes` was being treated as-if it was `-Cincremental`. This corrupted the output and made it confusing. The cause was using `starts_with` instead of properly splitting the option.

For example, with the command like `rustc foo.rs -Cincremental=/tmp/a -Zincremental-verify-ich=yes --crate-type lib` would previously look like:

```
note: compiler flags: -C incremental -Z incremental --crate-type lib
```

It now looks like:

```
note: compiler flags: -C incremental=[REDACTED] -Z incremental-verify-ich=yes --crate-type lib
```

I added a `[REDACTED]` marker for `-Cincremental` so it is a little less confusing that a value has been removed.

Fixes rust-lang#101588
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