Extend `-Cdebuginfo` with new options and named aliases #83947

jdtatz · 2021-04-06T20:11:25Z

The -Cdebuginfo=1 option was never line tables only and can't be due to backwards compatibility issues. This was clarified and an option for emitting line tables only was added. Additionally an option for emitting line info directives only was added, which is needed for some targets, i.e. nvptx. The debug info options should now behave similarly to clang's debug info options.

Fix #60020
Fix #64405

rust-highfive · 2021-04-06T20:11:28Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @lcnr (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

lcnr · 2021-04-12T10:46:41Z

not something i am familiar with, maybe

r? @nagisa

compiler/rustc_session/src/options.rs

nagisa · 2021-04-12T20:45:23Z

This overall seems good to me, but it should be accompanied with some tests I think.

jdtatz · 2021-04-23T18:30:20Z

This overall seems good to me, but it should be accompanied with some tests I think.

One issue with at the moment is that debug-info tests are not being ran #47163

nagisa · 2021-04-24T13:58:09Z

The test could be a codegen test verifying the kind of settings LLVM receives and the kind of debug info statements that do or do not show up in the IR. I suspect, for instance, that the optimized IR does not need to contain any @llvm.dbg.declarecalls when just line-tables/directives are being emitted.

(Also see https://rustc-dev-guide.rust-lang.org/tests/intro.html if you haven't yet)

compiler/rustc_codegen_ssa/src/back/linker.rs

nagisa · 2021-05-26T22:29:49Z

Sorry for taking so long to take another look at this!

This looks great, but there is a test failure that needs to be fixed :(

Could you also squash the commits together into 1 or 2 while removing commits such as "Formatting"? Thanks!

nagisa · 2021-05-28T15:36:59Z

During the meeting we had on Thrusday a number of T-compiler members have expressed that they would like to see an MCP for this change. However given that this is already implemented, we could also run an FCP, wdyt @pnkfelix @michaelwoerister?

michaelwoerister · 2021-06-10T12:23:16Z

Question: What exactly is "line-directives-only"?

crlf0710 · 2021-06-26T16:39:35Z

@jdtatz Ping from triage, CI is still red. Would you mind fixing that? Thanks!

JohnCSimon · 2021-07-12T00:13:50Z

@jdtatz Ping again from triage, build is still broken.

rfcbot · 2021-08-19T18:00:26Z

🔔 This is now entering its final comment period, as per the review above. 🔔

apiraino · 2021-08-26T14:37:13Z

The main thing blocking this from landing, from the viewpoint of T-compiler, is the need for improvements to the documentation, especially user-facing stuff.

cc @jdtatz in case the previous notification went lost

@rustbot label -S-waiting-on-team +S-waiting-on-author

rfcbot · 2021-08-29T18:16:50Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

The RFC will be merged soon.

`-Cdebuginfo=1` was never line tables only and can't be due to backwards compatibility issues. This was clarified and an option for line tables only was added. Additionally an option for line info directives only was added, which is well needed for some targets. The debug info options should now behave the same as clang's debug info options.

nagisa · 2021-09-24T10:33:02Z

src/doc/rustc/src/codegen-options/index.md

-* `1`: line tables only.
-* `2`: full debug info.
+* `0` or `none`: no debug info at all (the default).
+* `line-directives-only`: line info directives only, (For the nvptx* targets this enables [profiling](https://reviews.llvm.org/D46061), but on other targets the behavior is unspecified).


Hm, claiming unspecified behaviour in our flags unnecessarily feels… bad? Could we just say "enables profiling for some targets" (also what kind of profiling? sampling? instrumented?) for now?

JohnCSimon · 2021-11-08T04:51:57Z

ping from triage:
@jdtatz Can you please address the comment from the reviewer?

bors · 2021-12-30T02:15:34Z

☔ The latest upstream changes (presumably #88354) made this pull request unmergeable. Please resolve the merge conflicts.

JohnCSimon · 2022-01-30T04:45:06Z

Ping from triage:
@jdtatz
I'm closing this due to inactivity, Please reopen when you are ready to continue with this. Thank you.

@rustbot label: +S-inactive

…oerister Extend -Cdebuginfo with new options and named aliases This is a rebase of rust-lang#83947, along with my best guess at what the new options mean. I tried to follow the LLVM source code to get a better idea but ran into quite a lot of trouble (https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/go-to-definition.20in.20src.2Fllvm-project.3F). The description for the original PR follows below. Note that the changes in this PR have already been through FCP: rust-lang#83947 (comment) Closes rust-lang#109311. Helps with rust-lang#104968. r? `@michaelwoerister` cc `@cuviper` --- The -Cdebuginfo=1 option was never line tables only and can't be due to backwards compatibility issues. This was clarified and an option for emitting line tables only was added. Additionally an option for emitting line info directives only was added, which is needed for some targets, i.e. nvptx. The debug info options should now behave similarly to clang's debug info options. Fix rust-lang#60020 Fix rust-lang#64405

Extend -Cdebuginfo with new options and named aliases This is a rebase of rust-lang/rust#83947, along with my best guess at what the new options mean. I tried to follow the LLVM source code to get a better idea but ran into quite a lot of trouble (https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/go-to-definition.20in.20src.2Fllvm-project.3F). The description for the original PR follows below. Note that the changes in this PR have already been through FCP: rust-lang/rust#83947 (comment) Closes rust-lang/rust#109311. Helps with rust-lang/rust#104968. r? `@michaelwoerister` cc `@cuviper` --- The -Cdebuginfo=1 option was never line tables only and can't be due to backwards compatibility issues. This was clarified and an option for emitting line tables only was added. Additionally an option for emitting line info directives only was added, which is needed for some targets, i.e. nvptx. The debug info options should now behave similarly to clang's debug info options. Fix rust-lang/rust#60020 Fix rust-lang/rust#64405

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jdtatz force-pushed the debuginfo-fix branch from a8dca88 to 8571677 Compare May 9, 2021 23:13

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jdtatz force-pushed the debuginfo-fix branch from 068c479 to c4f33f5 Compare September 3, 2021 15:21

jdtatz added 2 commits September 3, 2021 11:27

More in-depth documentation for the new debuginfo options

8bfc641

jdtatz force-pushed the debuginfo-fix branch from c4f33f5 to 8bfc641 Compare September 3, 2021 17:02

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jyn514 mentioned this pull request Mar 20, 2023

Add a new -Z force-full-debuginfo flag #109311

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jyn514 mentioned this pull request Mar 31, 2023

Extend -Cdebuginfo with new options and named aliases #109808

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Extend `-Cdebuginfo` with new options and named aliases #83947

Extend `-Cdebuginfo` with new options and named aliases #83947

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Extend -Cdebuginfo with new options and named aliases #83947

Extend -Cdebuginfo with new options and named aliases #83947

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Extend `-Cdebuginfo` with new options and named aliases #83947

Extend `-Cdebuginfo` with new options and named aliases #83947

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