Implement debugging output of the bootstrap Step graph into a DOT file #144779

Kobzol · 2025-08-01T13:06:42Z

There are already a bunch of ways how we can debug bootstrap, so why not add one more =D (ideally I'd like to consolidate these approaches somewhat, @Shourya742 is looking into that, but I think that this specific debugging tool is orthogonal to the rest of them, and is quite useful).

This PR adds the option to render the bootstrap step graph into the DOT format, in order to understand what steps were executed, along with their fields (Debug output).

Here you can see an example of the generated DOT files for the BOOTSTRAP_TRACING=1 ./x build compiler --stage 2 --dry-run command on x64 Linux. One is with cached deps (what this PR does), the other one without.

bootstrap-dot.zip

Visual example:

r? @jieyouxu

rustbot · 2025-08-01T13:06:47Z

jieyouxu is currently at their maximum review capacity.
They may take a while to respond.

rustbot · 2025-08-01T13:06:49Z

The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.

cc @BoxyUwU, @jieyouxu, @Kobzol, @tshepang

jieyouxu · 2025-08-01T13:07:45Z

Oo yes, this is very nice :D I ran out of bandwidth today, so I'll take a closer look tmrw.

jieyouxu

Thanks

jieyouxu · 2025-08-02T12:05:00Z

@bors r+ rollup

bors · 2025-08-02T12:05:03Z

📌 Commit ac9a689 has been approved by jieyouxu

It is now in the queue for this repository.

Implement debugging output of the bootstrap Step graph into a DOT file There are already a bunch of ways how we can debug bootstrap, so why not add one more =D (ideally I'd like to consolidate these approaches somewhat, `@Shourya742` is looking into that, but I think that this specific debugging tool is orthogonal to the rest of them, and is quite useful). This PR adds the option to render the bootstrap step graph into the DOT format, in order to understand what steps were executed, along with their fields (`Debug` output). Here you can see an example of the generated DOT files for the `BOOTSTRAP_TRACING=1 ./x build compiler --stage 2 --dry-run` command on x64 Linux. One is with cached deps (what this PR does), the other one without. [bootstrap-dot.zip](https://github.com/user-attachments/files/21548679/bootstrap-dot.zip) Visual example: <img width="1899" height="445" alt="image" src="https://github.com/user-attachments/assets/ae40e6d2-0ea8-48bb-b77e-6b21700b95ee" /> r? `@jieyouxu`

Rollup of 14 pull requests Successful merges: - #143857 (Port #[macro_export] to the new attribute parsing infrastructure) - #143900 ([rustdoc] Correctly handle `should_panic` doctest attribute and fix `--no-run` test flag on the 2024 edition) - #144070 (Implement `hash_map` macro ) - #144322 (Add lint against dangling pointers from local variables) - #144443 (Make target pointer width in target json an integer) - #144667 (`AlignmentEnum` should just be `repr(usize)` now) - #144779 (Implement debugging output of the bootstrap Step graph into a DOT file) - #144790 (Multiple bounds checking elision failures) - #144794 (Port `#[coroutine]` to the new attribute system) - #144808 (`Interner` arg to `EarlyBinder` does not affect auto traits) - #144816 (Update E0562 to account for the new impl trait positions) - #144822 (Return a struct with named fields from `hash_owner_nodes`) - #144824 (Updated test links in compiler) - #144829 (Use full flag name in strip command for Darwin) r? `@ghost` `@rustbot` modify labels: rollup

Zalathar · 2025-08-03T03:52:31Z

Failed in rollup: #144844 (comment)

@bors r-

Zalathar · 2025-08-03T04:00:11Z

@bors try jobs=aarch64-gnu-llvm-19-2

rust-bors · 2025-08-03T04:00:15Z

⌛ Trying commit ac9a689 with merge a3dee25…

To cancel the try build, run the command @bors try cancel.

Implement debugging output of the bootstrap Step graph into a DOT file try-job: aarch64-gnu-llvm-19-2

rust-bors · 2025-08-03T04:08:24Z

💔 Test failed (CI). Failed jobs:

bors build finished (web logs, extended logs)
try - aarch64-gnu-llvm-19-2 (web logs, extended logs)

Kobzol · 2025-08-03T05:54:14Z

Heh, a logical git conflict with another PR, doesn't happen that often.

Kobzol · 2025-08-04T06:29:44Z

Rebased to fix compilation error.

@bors r=jieyouxu

bors · 2025-08-04T06:29:46Z

📌 Commit 2f4b40f has been approved by jieyouxu

It is now in the queue for this repository.

Implement debugging output of the bootstrap Step graph into a DOT file There are already a bunch of ways how we can debug bootstrap, so why not add one more =D (ideally I'd like to consolidate these approaches somewhat, `@Shourya742` is looking into that, but I think that this specific debugging tool is orthogonal to the rest of them, and is quite useful). This PR adds the option to render the bootstrap step graph into the DOT format, in order to understand what steps were executed, along with their fields (`Debug` output). Here you can see an example of the generated DOT files for the `BOOTSTRAP_TRACING=1 ./x build compiler --stage 2 --dry-run` command on x64 Linux. One is with cached deps (what this PR does), the other one without. [bootstrap-dot.zip](https://github.com/user-attachments/files/21548679/bootstrap-dot.zip) Visual example: <img width="1899" height="445" alt="image" src="https://github.com/user-attachments/assets/ae40e6d2-0ea8-48bb-b77e-6b21700b95ee" /> r? `@jieyouxu`

Rollup of 5 pull requests Successful merges: - #144741 (fix: Error on illegal `[const]`s inside blocks within legal positions) - #144779 (Implement debugging output of the bootstrap Step graph into a DOT file) - #144813 (Add a tidy check to prevent adding UI tests directly under `tests/ui/`) - #144866 (Remove `SHOULD_EMIT_LINTS` in favor of `should_emit`) - #144887 (`rust-analyzer` subtree update) r? `@ghost` `@rustbot` modify labels: rollup

Implement debugging output of the bootstrap Step graph into a DOT file There are already a bunch of ways how we can debug bootstrap, so why not add one more =D (ideally I'd like to consolidate these approaches somewhat, ``@Shourya742`` is looking into that, but I think that this specific debugging tool is orthogonal to the rest of them, and is quite useful). This PR adds the option to render the bootstrap step graph into the DOT format, in order to understand what steps were executed, along with their fields (`Debug` output). Here you can see an example of the generated DOT files for the `BOOTSTRAP_TRACING=1 ./x build compiler --stage 2 --dry-run` command on x64 Linux. One is with cached deps (what this PR does), the other one without. [bootstrap-dot.zip](https://github.com/user-attachments/files/21548679/bootstrap-dot.zip) Visual example: <img width="1899" height="445" alt="image" src="https://github.com/user-attachments/assets/ae40e6d2-0ea8-48bb-b77e-6b21700b95ee" /> r? ``@jieyouxu``

Rollup of 18 pull requests Successful merges: - #144467 (rustdoc template font links only emit `crossorigin` when needed) - #144548 (Rehome 21 `tests/ui/issues/` tests to other subdirectories under `tests/ui/`) - #144596 (libtest: print the type of test being run) - #144741 (fix: Error on illegal `[const]`s inside blocks within legal positions) - #144776 (`Printer` cleanups) - #144779 (Implement debugging output of the bootstrap Step graph into a DOT file) - #144813 (Add a tidy check to prevent adding UI tests directly under `tests/ui/`) - #144817 (Properly reject tail calls to `&FnPtr` or `&FnDef`) - #144852 (Rename `rust_panic_without_hook` to `resume_unwind` ) - #144866 (Remove `SHOULD_EMIT_LINTS` in favor of `should_emit`) - #144867 (Use `as_array` in PartialEq for arrays) - #144872 (Document Poisoning in `LazyCell` and `LazyLock`) - #144877 (coverage: Various small cleanups) - #144887 (`rust-analyzer` subtree update) - #144890 (Add `InterpCx::project_fields`) - #144894 (Delete `tests/ui/threads-sendsync/tcp-stress.rs`) - #144905 (rustc-dev-guide subtree update) - #144920 (Dont print arg span in MIR dump for tail call) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 17 pull requests Successful merges: - #144467 (rustdoc template font links only emit `crossorigin` when needed) - #144548 (Rehome 21 `tests/ui/issues/` tests to other subdirectories under `tests/ui/`) - #144741 (fix: Error on illegal `[const]`s inside blocks within legal positions) - #144776 (`Printer` cleanups) - #144779 (Implement debugging output of the bootstrap Step graph into a DOT file) - #144813 (Add a tidy check to prevent adding UI tests directly under `tests/ui/`) - #144817 (Properly reject tail calls to `&FnPtr` or `&FnDef`) - #144852 (Rename `rust_panic_without_hook` to `resume_unwind` ) - #144866 (Remove `SHOULD_EMIT_LINTS` in favor of `should_emit`) - #144867 (Use `as_array` in PartialEq for arrays) - #144872 (Document Poisoning in `LazyCell` and `LazyLock`) - #144877 (coverage: Various small cleanups) - #144887 (`rust-analyzer` subtree update) - #144890 (Add `InterpCx::project_fields`) - #144894 (Delete `tests/ui/threads-sendsync/tcp-stress.rs`) - #144905 (rustc-dev-guide subtree update) - #144920 (Dont print arg span in MIR dump for tail call) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #144779 - Kobzol:bootstrap-dot, r=jieyouxu Implement debugging output of the bootstrap Step graph into a DOT file There are already a bunch of ways how we can debug bootstrap, so why not add one more =D (ideally I'd like to consolidate these approaches somewhat, ```@Shourya742``` is looking into that, but I think that this specific debugging tool is orthogonal to the rest of them, and is quite useful). This PR adds the option to render the bootstrap step graph into the DOT format, in order to understand what steps were executed, along with their fields (`Debug` output). Here you can see an example of the generated DOT files for the `BOOTSTRAP_TRACING=1 ./x build compiler --stage 2 --dry-run` command on x64 Linux. One is with cached deps (what this PR does), the other one without. [bootstrap-dot.zip](https://github.com/user-attachments/files/21548679/bootstrap-dot.zip) Visual example: <img width="1899" height="445" alt="image" src="https://github.com/user-attachments/assets/ae40e6d2-0ea8-48bb-b77e-6b21700b95ee" /> r? ```@jieyouxu```

Rollup of 17 pull requests Successful merges: - rust-lang/rust#144467 (rustdoc template font links only emit `crossorigin` when needed) - rust-lang/rust#144548 (Rehome 21 `tests/ui/issues/` tests to other subdirectories under `tests/ui/`) - rust-lang/rust#144741 (fix: Error on illegal `[const]`s inside blocks within legal positions) - rust-lang/rust#144776 (`Printer` cleanups) - rust-lang/rust#144779 (Implement debugging output of the bootstrap Step graph into a DOT file) - rust-lang/rust#144813 (Add a tidy check to prevent adding UI tests directly under `tests/ui/`) - rust-lang/rust#144817 (Properly reject tail calls to `&FnPtr` or `&FnDef`) - rust-lang/rust#144852 (Rename `rust_panic_without_hook` to `resume_unwind` ) - rust-lang/rust#144866 (Remove `SHOULD_EMIT_LINTS` in favor of `should_emit`) - rust-lang/rust#144867 (Use `as_array` in PartialEq for arrays) - rust-lang/rust#144872 (Document Poisoning in `LazyCell` and `LazyLock`) - rust-lang/rust#144877 (coverage: Various small cleanups) - rust-lang/rust#144887 (`rust-analyzer` subtree update) - rust-lang/rust#144890 (Add `InterpCx::project_fields`) - rust-lang/rust#144894 (Delete `tests/ui/threads-sendsync/tcp-stress.rs`) - rust-lang/rust#144905 (rustc-dev-guide subtree update) - rust-lang/rust#144920 (Dont print arg span in MIR dump for tail call) r? `@ghost` `@rustbot` modify labels: rollup

rustbot assigned jieyouxu Aug 1, 2025

rustbot added A-rustc-dev-guide Area: rustc-dev-guide S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Aug 1, 2025

jieyouxu approved these changes Aug 2, 2025

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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 Aug 2, 2025

Zalathar mentioned this pull request Aug 3, 2025

Rollup of 14 pull requests #144844

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bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 3, 2025

rust-bors bot added a commit that referenced this pull request Aug 3, 2025

Auto merge of #144779 - Kobzol:bootstrap-dot, r=<try>

a3dee25

Implement debugging output of the bootstrap Step graph into a DOT file try-job: aarch64-gnu-llvm-19-2

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Kobzol added 2 commits August 4, 2025 08:29

Implement debugging output of the bootstrap Step graph into a DOT file

450040f

Do not render both cached and uncached edge between two steps

2f4b40f

Kobzol force-pushed the bootstrap-dot branch from ac9a689 to 2f4b40f Compare August 4, 2025 06:29

bors removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Aug 4, 2025

bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Aug 4, 2025

Zalathar mentioned this pull request Aug 4, 2025

Rollup of 5 pull requests #144891

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samueltardieu mentioned this pull request Aug 4, 2025

Rollup of 18 pull requests #144929

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samueltardieu mentioned this pull request Aug 5, 2025

Rollup of 17 pull requests #144934

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bors merged commit 3ec8b67 into rust-lang:master Aug 5, 2025

rustbot added this to the 1.91.0 milestone Aug 5, 2025

Kobzol deleted the bootstrap-dot branch August 5, 2025 05:52

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