Introduce debuginfo to statements in MIR #142771

dianqk · 2025-06-20T07:16:46Z

The PR introduces support for debug information within dead statements. Currently, only the reference statement is supported, which is sufficient to fix #128081.

I don't modify Stable MIR, as I don't think we need debug information when using it.

This PR represents the debug information for the dead reference statement via #dbg_value. For example, let _foo_b = &foo.b becomes #dbg_value(ptr %foo, !22, !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value), !26). You can see this here: https://rust.godbolt.org/z/d43js6adv.

The general principle for handling debug information is to never provide less debug information than the optimized LLVM IR.

The current rules for dropping debug information in this PR are:

If the LLVM IR cannot represent a reference address, it's replaced with poison or simply dropped. For example, see: https://rust.godbolt.org/z/shGqPec8W. I'm using poison in all such cases now.
All debuginfos is dropped when merging multiple successor BBs. An example is available here: https://rust.godbolt.org/z/TE1q3Wq6M.

I haven't drop debuginfos in MatchBranchSimplification, because LLVM also pick one branch for it.

For the perf result:

I expected this to introduce some regressions; however, the results mixed the effects of inlining. Looking at the doc profile, this is a clear optimization. One potential regression I'm investigating is serde-1.0.219-debug-full.

compiler/rustc_middle/src/mir/mod.rs

dianqk · 2025-06-20T10:52:57Z

@bors2 try @rust-timer queue

rust-bors · 2025-06-20T10:53:00Z

⌛ Trying commit 51576e7 with merge eb83156…

To cancel the try build, run the command @bors2 try cancel.

Introduce debuginfo to statements in MIR Not ready for reviewing. Something known: - [ ] Retain debuginfo when concatenating bbs - [ ] Document about when to drop debuginfos (don't be worse than the optimized LLVM IR) - [ ] Missing tests r? ghost

rust-bors · 2025-06-20T13:23:31Z

☀️ Try build successful (CI)
Build commit: eb83156 (eb83156169ae3bbdd1385d498455dbc44283f5ff, parent: 18491d5be00eb3ed2f1ccee2ac5b792694f2a7a0)

rust-timer · 2025-06-20T23:32:50Z

Finished benchmarking commit (eb83156): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.9%	[0.2%, 14.5%]	51
Regressions ❌ (secondary)	0.8%	[0.1%, 1.6%]	52
Improvements ✅ (primary)	-0.4%	[-2.1%, -0.2%]	35
Improvements ✅ (secondary)	-0.3%	[-0.5%, -0.2%]	39
All ❌✅ (primary)	0.4%	[-2.1%, 14.5%]	86

Max RSS (memory usage)

Results (primary 2.3%, secondary 3.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.3%	[0.8%, 4.7%]	54
Regressions ❌ (secondary)	3.6%	[0.7%, 7.4%]	38
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.3%	[-3.3%, -3.3%]	1
All ❌✅ (primary)	2.3%	[0.8%, 4.7%]	54

Cycles

Results (primary 3.2%, secondary 2.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.9%	[1.1%, 14.4%]	7
Regressions ❌ (secondary)	2.5%	[2.0%, 3.3%]	3
Improvements ✅ (primary)	-2.0%	[-2.0%, -2.0%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.2%	[-2.0%, 14.4%]	8

Binary size

Results (primary 0.5%, secondary 0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.0%, 2.2%]	123
Regressions ❌ (secondary)	1.1%	[0.0%, 3.5%]	59
Improvements ✅ (primary)	-0.9%	[-6.5%, -0.1%]	11
Improvements ✅ (secondary)	-0.5%	[-13.0%, -0.1%]	55
All ❌✅ (primary)	0.5%	[-6.5%, 2.2%]	134

Bootstrap: 691.482s -> 692.445s (0.14%)
Artifact size: 371.94 MiB -> 372.12 MiB (0.05%)

dianqk · 2025-06-21T02:59:42Z

@bors2 try @rust-timer queue

rust-bors · 2025-06-21T02:59:46Z

⌛ Trying commit e72c3ae with merge 77d5c6a…

To cancel the try build, run the command @bors2 try cancel.

Introduce debuginfo to statements in MIR Not ready for reviewing. Something known: - [ ] Retain debuginfo when concatenating bbs - [ ] Document about when to drop debuginfos (don't be worse than the optimized LLVM IR) - [ ] Missing tests r? ghost

rust-bors · 2025-06-21T05:28:30Z

☀️ Try build successful (CI)
Build commit: 77d5c6a (77d5c6a20a77fabdee3790a412618b82178e9ab4, parent: 15c701fbc995eb6c5b3a86021c18185f8eee020d)

rust-timer · 2025-06-21T09:26:06Z

Finished benchmarking commit (77d5c6a): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.9%	[0.1%, 14.5%]	53
Regressions ❌ (secondary)	0.8%	[0.1%, 1.6%]	50
Improvements ✅ (primary)	-0.4%	[-3.0%, -0.2%]	46
Improvements ✅ (secondary)	-0.3%	[-0.5%, -0.2%]	41
All ❌✅ (primary)	0.3%	[-3.0%, 14.5%]	99

Max RSS (memory usage)

Results (primary 2.4%, secondary 3.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.4%	[0.5%, 5.7%]	38
Regressions ❌ (secondary)	4.2%	[1.3%, 6.2%]	25
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.7%	[-3.0%, -1.1%]	4
All ❌✅ (primary)	2.4%	[0.5%, 5.7%]	38

Cycles

Results (primary 2.1%, secondary 0.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.0%	[0.8%, 14.1%]	10
Regressions ❌ (secondary)	3.3%	[2.3%, 4.3%]	2
Improvements ✅ (primary)	-2.3%	[-2.9%, -1.7%]	2
Improvements ✅ (secondary)	-2.2%	[-2.6%, -1.9%]	2
All ❌✅ (primary)	2.1%	[-2.9%, 14.1%]	12

Binary size

Results (primary 0.5%, secondary 0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.0%, 3.0%]	122
Regressions ❌ (secondary)	1.1%	[0.0%, 3.5%]	59
Improvements ✅ (primary)	-0.7%	[-4.9%, -0.0%]	15
Improvements ✅ (secondary)	-0.5%	[-12.7%, -0.0%]	55
All ❌✅ (primary)	0.5%	[-4.9%, 3.0%]	137

Bootstrap: 690.617s -> 691.47s (0.12%)
Artifact size: 371.83 MiB -> 372.01 MiB (0.05%)

bors · 2025-06-25T18:27:45Z

☔ The latest upstream changes (presumably #142870) made this pull request unmergeable. Please resolve the merge conflicts.

rust-timer · 2025-08-03T22:16:44Z

Finished benchmarking commit (61f71d4): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.5%	[0.1%, 2.7%]	27
Regressions ❌ (secondary)	0.5%	[0.0%, 0.9%]	37
Improvements ✅ (primary)	-0.3%	[-0.8%, -0.1%]	62
Improvements ✅ (secondary)	-0.3%	[-1.1%, -0.0%]	74
All ❌✅ (primary)	-0.1%	[-0.8%, 2.7%]	89

Max RSS (memory usage)

Results (primary 2.0%, secondary 4.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.1%	[0.7%, 5.2%]	71
Regressions ❌ (secondary)	4.0%	[1.7%, 5.8%]	38
Improvements ✅ (primary)	-3.5%	[-4.0%, -3.0%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.0%	[-4.0%, 5.2%]	73

Cycles

Results (primary -0.6%, secondary 3.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.7%	[2.7%, 2.7%]	1
Regressions ❌ (secondary)	5.0%	[2.3%, 7.3%]	8
Improvements ✅ (primary)	-2.3%	[-2.3%, -2.3%]	2
Improvements ✅ (secondary)	-5.2%	[-5.2%, -5.2%]	1
All ❌✅ (primary)	-0.6%	[-2.3%, 2.7%]	3

Binary size

Results (primary 0.5%, secondary 0.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.1%, 3.2%]	117
Regressions ❌ (secondary)	1.1%	[0.0%, 3.6%]	57
Improvements ✅ (primary)	-0.6%	[-6.6%, -0.1%]	19
Improvements ✅ (secondary)	-0.3%	[-6.6%, -0.1%]	55
All ❌✅ (primary)	0.5%	[-6.6%, 3.2%]	136

Bootstrap: 467.629s -> 469.243s (0.35%)
Artifact size: 376.97 MiB -> 376.97 MiB (-0.00%)

cjgillot · 2025-08-04T23:56:14Z

compiler/rustc_middle/src/mir/mod.rs

+            let retain = f(stmt);
+            if retain {
+                if !debuginfos.is_empty() {
+                    if !stmt.debuginfos.is_empty() {


Is this check worth it?

No. I have removed the second check.

cjgillot · 2025-08-04T23:56:45Z

compiler/rustc_middle/src/mir/mod.rs

+            self.statements.retain_mut(|stmt| f(stmt));
+            return;
+        }
+        let mut debuginfos = Vec::new();


Do you mind adding a comment saying so?

cjgillot · 2025-08-04T23:57:28Z

compiler/rustc_middle/src/mir/statement.rs

@@ -15,17 +15,33 @@ use crate::ty::CoroutineArgsExt;
 pub struct Statement<'tcx> {
    pub source_info: SourceInfo,
    pub kind: StatementKind<'tcx>,
+    pub debuginfos: Vec<StmtDebugInfo<'tcx>>,


Could you add a comment explaining that those debuginfo are executed before the primary statement?

Added:

/// Some debuginfos appearing before the primary statement.

cjgillot · 2025-08-05T00:14:11Z

compiler/rustc_middle/src/mir/visit.rs

+                location: Location
+            ) {
+                self.super_statement_debuginfos(stmt_debuginfo, location);
+            }


Do we really need this method?

I'm not sure but I removed.

cjgillot · 2025-08-05T00:15:47Z

compiler/rustc_middle/src/mir/mod.rs

@@ -1342,6 +1342,10 @@ pub struct BasicBlockData<'tcx> {
    /// List of statements in this block.
    pub statements: Vec<Statement<'tcx>>,

+    /// All debuginfos happen before the statement.
+    /// Put debuginfos here when the last statement is eliminated.
+    pub after_last_stmt_debuginfos: Vec<StmtDebugInfo<'tcx>>,


Is it after the last statement, or before the terminator? Why isn't it inside Terminator?

We have some passes that change the terminator, which means we also must hand debuginfos. I think this will make things more complicated.
I expect these debuginfos to be handled in simplifycfg as much as possible.

cjgillot · 2025-08-05T01:37:06Z

compiler/rustc_codegen_ssa/src/mir/statement.rs

-                    LocalRef::Operand(operand_ref) => match operand_ref.val {
-                        OperandValue::Immediate(v) => {
-                            Some(PlaceRef::new_sized(v, operand_ref.layout))
+                let assign_ref = if let Some(place) = place {


Use place.and_then(|place| to keep the previous logic?

I have removed the Option.

cjgillot · 2025-08-05T01:37:59Z

compiler/rustc_middle/src/mir/statement.rs

@@ -958,5 +969,5 @@ impl RawPtrKind {

 #[derive(Clone, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
 pub enum StmtDebugInfo<'tcx> {
-    AssignRef(Local, Place<'tcx>),
+    AssignRef(Local, Option<Place<'tcx>>),


I'm not convinced by the benefit of allowing None here. Do you mind splitting this change from other tweaks to DSE, so we can see what it does in isolation?

Is 048f7eb what you're looking for?

cjgillot · 2025-08-05T01:43:02Z

compiler/rustc_mir_transform/src/simplify.rs

+            self.always_used.contains(local)
+        );
+        // To keep things simple, we don't handle debugging information here, these are in DSE.
+        self.always_used.contains(local) || self.use_count[local] != 0


I'd rather keep handling debuginfo in this general SimplifyLocals. It runs much more often than DSE.

Perhaps, but I don't want to make this PR any more complicated, and I'm concerned about the compile time.

cjgillot · 2025-08-05T01:43:42Z

compiler/rustc_mir_transform/src/lib.rs

@@ -718,6 +717,7 @@ pub(crate) fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'
            &strip_debuginfo::StripDebugInfo,
            &copy_prop::CopyProp,
            &dead_store_elimination::DeadStoreElimination::Final,
+            &match_branches::MatchBranchSimplification,


Do you mind submitting this change in a separate PR?

I will drop this at the next update.

cjgillot · 2025-08-05T01:45:11Z

compiler/rustc_mir_transform/src/simplify.rs

@@ -254,20 +244,20 @@ impl<'a, 'tcx> CfgSimplifier<'a, 'tcx> {
            current = target;
        }
        let last = current;
+        *changed |= *start != last;


Do you mind submitting this bugfix in a standalone PR?

This may not be the best phase, but we do need a CFG simplification. A potential improvement would be to implement a trivial simplification.

Add a test case with the same local. ``` // DBG: _1 = &_2 _1 = &_3 ```

Add a test case with the same local.

Add a assertion for unsupported debug information.

Add a semicolon.

use `?` use `successors.all`

Add a test case for identical successors.

…buginfos Add a test case for a invalid place on debuginfos

…buginfos - duplicate the StmtDebugInfo arm, a None and a Some version - iter projections for invalid place

fix tidy checks failed

dianqk · 2025-08-06T13:10:16Z

I'll squash the fixups during the next rebase. 🙏

rust-log-analyzer · 2025-08-06T13:51:47Z

The job aarch64-gnu-llvm-19-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

---- [debuginfo-gdb] tests/debuginfo/opt/dead_refs.rs stdout ----

error: compilation failed!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/debuginfo/opt/dead_refs.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/debuginfo/opt/dead_refs.gdb/a" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-g" "-Copt-level=3"
stdout: none
--- stderr -------------------------------
error[E0557]: feature has been removed
##[error]  --> /checkout/tests/debuginfo/opt/dead_refs.rs:30:12
   |

…hain-changed, r=cjgillot simplifycfg: Mark as changed when start is modified in collapse goto chain Split from rust-lang#142771. r? cjgillot

mir: Do not modify NonUse in `super_projection_elem` Split from rust-lang#142771. r? cjgillot

Rollup merge of #144998 - dianqk:visit-no-use-proj, r=cjgillot mir: Do not modify NonUse in `super_projection_elem` Split from #142771. r? cjgillot

Rollup merge of #144996 - dianqk:simplifycfg-collapse_goto_chain-changed, r=cjgillot simplifycfg: Mark as changed when start is modified in collapse goto chain Split from #142771. r? cjgillot

rustbot added A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 20, 2025

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dianqk force-pushed the mir-stmt-debuginfo branch from 15c968a to 6b013d4 Compare June 20, 2025 08:01

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bjorn3 reviewed Jun 20, 2025

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compiler/rustc_middle/src/mir/mod.rs Outdated Show resolved Hide resolved

dianqk force-pushed the mir-stmt-debuginfo branch from 6b013d4 to 51576e7 Compare June 20, 2025 09:23

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rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jun 20, 2025

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rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Jun 20, 2025

dianqk force-pushed the mir-stmt-debuginfo branch from 51576e7 to e72c3ae Compare June 21, 2025 02:31

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rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jun 21, 2025

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jun 21, 2025

rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 3, 2025

cjgillot reviewed Aug 5, 2025

View reviewed changes

cjgillot self-assigned this Aug 5, 2025

dianqk added 15 commits August 5, 2025 20:13

mir-opt: Eliminate dead ref statements

3ee4f4f

codegen: Generate dbg_value for the ref statement

d44c31f

simplifycfg: Preserve debuginfos when merging bbs

f34299d

mir-opt: Eliminate dead statements even if they are used by debuginfos

048f7eb

mir-opt: Eliminate trivial unnecessary storage annotations

ec997fc

mir-opt: Postpone the MatchBranchSimplification to after the final DSE

8717385

This may not be the best phase, but we do need a CFG simplification. A potential improvement would be to implement a trivial simplification.

mir: Simplify the handling of debuginfos

e9a76fe

fixup! mir-opt: Eliminate dead ref statements

cd2784f

Add a test case with the same local. ``` // DBG: _1 = &_2 _1 = &_3 ```

fixup! codegen: Generate dbg_value for the ref statement

db8aee0

Add a test case with the same local.

fixup! mir-opt: Eliminate dead ref statements

6662f7d

Add a assertion for unsupported debug information.

fixup! mir-opt: Eliminate dead ref statements

06f5ac8

Add a semicolon.

fixup! simplifycfg: Preserve debuginfos when merging bbs

92cba20

use `?` use `successors.all`

fixup! simplifycfg: Preserve debuginfos when merging bbs

f7cb799

Add a test case for identical successors.

fixup! mir-opt: Eliminate dead statements even if they are used by de…

432d579

…buginfos Add a test case for a invalid place on debuginfos

fixup! mir-opt: Eliminate dead statements even if they are used by de…

224fbe9

…buginfos - duplicate the StmtDebugInfo arm, a None and a Some version - iter projections for invalid place

This was referenced Aug 6, 2025

simplifycfg: Mark as changed when start is modified in collapse goto chain #144996

Merged

mir: Do not modify NonUse in super_projection_elem #144998

Merged

dianqk force-pushed the mir-stmt-debuginfo branch from 94ddfe6 to 224fbe9 Compare August 6, 2025 12:43

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fixup! fixup! codegen: Generate dbg_value for the ref statement

5105df9

fix tidy checks failed

GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Aug 6, 2025

Rollup merge of rust-lang#144998 - dianqk:visit-no-use-proj, r=cjgillot

c152aa8

mir: Do not modify NonUse in `super_projection_elem` Split from rust-lang#142771. r? cjgillot

rust-timer added a commit that referenced this pull request Aug 7, 2025

Unrolled build for #144998

41b645e

Rollup merge of #144998 - dianqk:visit-no-use-proj, r=cjgillot mir: Do not modify NonUse in `super_projection_elem` Split from #142771. r? cjgillot

Introduce debuginfo to statements in MIR #142771

Are you sure you want to change the base?

Introduce debuginfo to statements in MIR #142771

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Overall result: ❌✅ regressions and improvements - please read the text below

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rust-timer commented Jun 21, 2025

Overall result: ❌✅ regressions and improvements - please read the text below

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Overall result: ❌✅ regressions and improvements - please read the text below

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dianqk commented Aug 6, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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dianqk commented Jun 20, 2025 •

edited by rustbot

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dianqk commented Aug 6, 2025 •

edited

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