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[llvm-dwarfdump][LineCov 1/3] Add variable coverage metrics #169646

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eeb5e62
Add line table coverage metrics
unexpectedlydefined Nov 4, 2025
2681aa5
fixup! Add line table coverage metrics
unexpectedlydefined Nov 26, 2025
b58fcac
fixup! Add line table coverage metrics
unexpectedlydefined Nov 26, 2025
c6121d4
fixup! Add line table coverage metrics
unexpectedlydefined Nov 26, 2025
68aaa55
fixup! Add line table coverage metrics
unexpectedlydefined Nov 26, 2025
99a9d93
fixup! Add line table coverage metrics
unexpectedlydefined Dec 5, 2025
fc4f4d7
fixup! Add line table coverage metrics
unexpectedlydefined Dec 11, 2025
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147 changes: 67 additions & 80 deletions llvm/test/tools/llvm-dwarfdump/X86/Inputs/coverage-opt.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -29,106 +29,93 @@

; ModuleID = 'test.c'
source_filename = "test.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: noinline nounwind uwtable
define dso_local void @fn1(i32 noundef %0, i32 noundef %1) local_unnamed_addr !dbg !9 {
call void @llvm.dbg.value(metadata i32 %0, metadata !14, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.value(metadata i32 %1, metadata !15, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.value(metadata !DIArgList(i32 %0, i32 %1), metadata !16, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value)), !dbg !18
call void @llvm.dbg.value(metadata i32 undef, metadata !16, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.value(metadata i32 undef, metadata !16, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.value(metadata i32 7, metadata !17, metadata !DIExpression()), !dbg !18
tail call void @fn2(i32 noundef 7), !dbg !19
call void @llvm.dbg.value(metadata i32 undef, metadata !16, metadata !DIExpression(DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value)), !dbg !18
ret void, !dbg !20
define dso_local void @fn1(i32 %0, i32 %1) local_unnamed_addr !dbg !10 {
#dbg_value(i32 poison, !15, !DIExpression(), !19)
#dbg_value(i32 poison, !16, !DIExpression(), !19)
#dbg_value(!DIArgList(i32 poison, i32 poison), !17, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_stack_value), !19)
#dbg_value(i32 poison, !17, !DIExpression(), !19)
#dbg_value(i32 poison, !17, !DIExpression(), !19)
#dbg_value(i32 7, !18, !DIExpression(), !19)
tail call void @fn2(i32 noundef 7) #3, !dbg !20
#dbg_value(i32 poison, !17, !DIExpression(DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value), !19)
Comment on lines +37 to +44
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@SLTozer SLTozer Dec 17, 2025

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Looks like all of the non-const arguments became poison, rather than just the ones that were previously undef. It's good to test at least one variable that's completely dead, so I'd recommend keeping at least one "fully dead" variable.

ret void, !dbg !21
}

; Function Attrs: argmemonly mustprogress nofree nosync nounwind willreturn
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)

declare !dbg !21 void @fn2(i32 noundef) local_unnamed_addr
declare !dbg !22 void @fn2(i32 noundef) local_unnamed_addr

; Function Attrs: argmemonly mustprogress nofree nosync nounwind willreturn
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)

; Function Attrs: noinline nounwind uwtable
define dso_local i32 @f() local_unnamed_addr !dbg !25 {
%1 = alloca i32, align 4
%2 = alloca i32, align 4
%3 = bitcast i32* %1 to i8*, !dbg !31
call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %3), !dbg !31
%4 = bitcast i32* %2 to i8*, !dbg !31
call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %4), !dbg !31
call void @llvm.dbg.value(metadata i32* %1, metadata !29, metadata !DIExpression(DW_OP_deref)), !dbg !32
call void @fn3(i32* noundef nonnull %1), !dbg !33
call void @llvm.dbg.value(metadata i32* %2, metadata !30, metadata !DIExpression(DW_OP_deref)), !dbg !32
call void @fn3(i32* noundef nonnull %2), !dbg !34
%5 = load i32, i32* %1, align 4, !dbg !35, !tbaa !36
call void @llvm.dbg.value(metadata i32 %5, metadata !29, metadata !DIExpression()), !dbg !32
%6 = load i32, i32* %2, align 4, !dbg !40, !tbaa !36
call void @llvm.dbg.value(metadata i32 %6, metadata !30, metadata !DIExpression()), !dbg !32
call void @fn1(i32 noundef %5, i32 noundef %6), !dbg !41
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %4), !dbg !42
call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %3), !dbg !42
ret i32 0, !dbg !43
define dso_local noundef i32 @f() local_unnamed_addr !dbg !25 {
%1 = alloca i32, align 4, !DIAssignID !31
#dbg_assign(i1 poison, !29, !DIExpression(), !31, ptr %1, !DIExpression(), !32)
%2 = alloca i32, align 4, !DIAssignID !33
#dbg_assign(i1 poison, !30, !DIExpression(), !33, ptr %2, !DIExpression(), !32)
call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #3, !dbg !34
call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #3, !dbg !34
call void @fn3(ptr noundef nonnull %1) #3, !dbg !35
call void @fn3(ptr noundef nonnull %2) #3, !dbg !36
call void @fn1(i32 poison, i32 poison), !dbg !37
call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #3, !dbg !38
call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #3, !dbg !38
ret i32 0, !dbg !39
}

declare !dbg !44 void @fn3(i32* noundef) local_unnamed_addr

; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
declare !dbg !40 void @fn3(ptr noundef) local_unnamed_addr

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
!llvm.ident = !{!8}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8}
!llvm.ident = !{!9}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.6", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 19.1.7", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 7, !"PIC Level", i32 2}
!5 = !{i32 8, !"PIC Level", i32 2}
!6 = !{i32 7, !"PIE Level", i32 2}
!7 = !{i32 7, !"uwtable", i32 1}
!8 = !{!"clang version 14.0.6"}
!9 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 5, type: !10, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
!10 = !DISubroutineType(types: !11)
!11 = !{null, !12, !12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14, !15, !16, !17}
!14 = !DILocalVariable(name: "x", arg: 1, scope: !9, file: !1, line: 5, type: !12)
!15 = !DILocalVariable(name: "y", arg: 2, scope: !9, file: !1, line: 5, type: !12)
!16 = !DILocalVariable(name: "u", scope: !9, file: !1, line: 7, type: !12)
!17 = !DILocalVariable(name: "a", scope: !9, file: !1, line: 14, type: !12)
!18 = !DILocation(line: 0, scope: !9)
!19 = !DILocation(line: 15, column: 3, scope: !9)
!20 = !DILocation(line: 17, column: 1, scope: !9)
!21 = !DISubprogram(name: "fn2", scope: !1, file: !1, line: 2, type: !22, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !24)
!22 = !DISubroutineType(types: !23)
!23 = !{null, !12}
!24 = !{}
!7 = !{i32 7, !"uwtable", i32 2}
!8 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
!9 = !{!"clang version 19.1.7"}
!10 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 5, type: !11, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14)
!11 = !DISubroutineType(types: !12)
!12 = !{null, !13, !13}
!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!14 = !{!15, !16, !17, !18}
!15 = !DILocalVariable(name: "x", arg: 1, scope: !10, file: !1, line: 5, type: !13)
!16 = !DILocalVariable(name: "y", arg: 2, scope: !10, file: !1, line: 5, type: !13)
!17 = !DILocalVariable(name: "u", scope: !10, file: !1, line: 7, type: !13)
!18 = !DILocalVariable(name: "a", scope: !10, file: !1, line: 14, type: !13)
!19 = !DILocation(line: 0, scope: !10)
!20 = !DILocation(line: 15, column: 3, scope: !10)
!21 = !DILocation(line: 17, column: 1, scope: !10)
!22 = !DISubprogram(name: "fn2", scope: !1, file: !1, line: 2, type: !23, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
!23 = !DISubroutineType(types: !24)
!24 = !{null, !13}
!25 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 20, type: !26, scopeLine: 21, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !28)
!26 = !DISubroutineType(types: !27)
!27 = !{!12}
!27 = !{!13}
!28 = !{!29, !30}
!29 = !DILocalVariable(name: "l", scope: !25, file: !1, line: 22, type: !12)
!30 = !DILocalVariable(name: "k", scope: !25, file: !1, line: 22, type: !12)
!31 = !DILocation(line: 22, column: 3, scope: !25)
!29 = !DILocalVariable(name: "l", scope: !25, file: !1, line: 22, type: !13)
!30 = !DILocalVariable(name: "k", scope: !25, file: !1, line: 22, type: !13)
!31 = distinct !DIAssignID()
!32 = !DILocation(line: 0, scope: !25)
!33 = !DILocation(line: 23, column: 3, scope: !25)
!34 = !DILocation(line: 24, column: 3, scope: !25)
!35 = !DILocation(line: 25, column: 8, scope: !25)
!36 = !{!37, !37, i64 0}
!37 = !{!"int", !38, i64 0}
!38 = !{!"omnipotent char", !39, i64 0}
!39 = !{!"Simple C/C++ TBAA"}
!40 = !DILocation(line: 25, column: 11, scope: !25)
!41 = !DILocation(line: 25, column: 3, scope: !25)
!42 = !DILocation(line: 27, column: 1, scope: !25)
!43 = !DILocation(line: 26, column: 3, scope: !25)
!44 = !DISubprogram(name: "fn3", scope: !1, file: !1, line: 1, type: !45, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !24)
!45 = !DISubroutineType(types: !46)
!46 = !{null, !47}
!47 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!33 = distinct !DIAssignID()
!34 = !DILocation(line: 22, column: 3, scope: !25)
!35 = !DILocation(line: 23, column: 3, scope: !25)
!36 = !DILocation(line: 24, column: 3, scope: !25)
!37 = !DILocation(line: 25, column: 3, scope: !25)
!38 = !DILocation(line: 27, column: 1, scope: !25)
!39 = !DILocation(line: 26, column: 3, scope: !25)
!40 = !DISubprogram(name: "fn3", scope: !1, file: !1, line: 1, type: !41, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
!41 = !DISubroutineType(types: !42)
!42 = !{null, !43}
!43 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
71 changes: 34 additions & 37 deletions llvm/test/tools/llvm-dwarfdump/X86/Inputs/coverage.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@

; ModuleID = 'test.c'
source_filename = "test.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: noinline nounwind optnone uwtable
Expand All @@ -38,89 +38,86 @@ define dso_local void @fn1(i32 noundef %0, i32 noundef %1) !dbg !10 {
%4 = alloca i32, align 4
%5 = alloca i32, align 4
%6 = alloca i32, align 4
store i32 %0, i32* %3, align 4
call void @llvm.dbg.declare(metadata i32* %3, metadata !15, metadata !DIExpression()), !dbg !16
store i32 %1, i32* %4, align 4
call void @llvm.dbg.declare(metadata i32* %4, metadata !17, metadata !DIExpression()), !dbg !18
call void @llvm.dbg.declare(metadata i32* %5, metadata !19, metadata !DIExpression()), !dbg !20
%7 = load i32, i32* %3, align 4, !dbg !21
%8 = load i32, i32* %4, align 4, !dbg !22
store i32 %0, ptr %3, align 4
#dbg_declare(ptr %3, !15, !DIExpression(), !16)
store i32 %1, ptr %4, align 4
#dbg_declare(ptr %4, !17, !DIExpression(), !18)
#dbg_declare(ptr %5, !19, !DIExpression(), !20)
%7 = load i32, ptr %3, align 4, !dbg !21
%8 = load i32, ptr %4, align 4, !dbg !22
%9 = add nsw i32 %7, %8, !dbg !23
store i32 %9, i32* %5, align 4, !dbg !20
%10 = load i32, i32* %3, align 4, !dbg !24
store i32 %9, ptr %5, align 4, !dbg !20
%10 = load i32, ptr %3, align 4, !dbg !24
%11 = icmp sgt i32 %10, 1, !dbg !26
br i1 %11, label %12, label %15, !dbg !27

12: ; preds = %2
%13 = load i32, i32* %5, align 4, !dbg !28
%13 = load i32, ptr %5, align 4, !dbg !28
%14 = add nsw i32 %13, 1, !dbg !28
store i32 %14, i32* %5, align 4, !dbg !28
store i32 %14, ptr %5, align 4, !dbg !28
br label %18, !dbg !29

15: ; preds = %2
%16 = load i32, i32* %5, align 4, !dbg !30
%16 = load i32, ptr %5, align 4, !dbg !30
%17 = add nsw i32 %16, 2, !dbg !30
store i32 %17, i32* %5, align 4, !dbg !30
store i32 %17, ptr %5, align 4, !dbg !30
br label %18

18: ; preds = %15, %12
%19 = load i32, i32* %4, align 4, !dbg !31
%19 = load i32, ptr %4, align 4, !dbg !31
%20 = icmp sgt i32 %19, 4, !dbg !33
br i1 %20, label %21, label %25, !dbg !34

21: ; preds = %18
%22 = load i32, i32* %3, align 4, !dbg !35
%23 = load i32, i32* %5, align 4, !dbg !36
%22 = load i32, ptr %3, align 4, !dbg !35
%23 = load i32, ptr %5, align 4, !dbg !36
%24 = add nsw i32 %23, %22, !dbg !36
store i32 %24, i32* %5, align 4, !dbg !36
store i32 %24, ptr %5, align 4, !dbg !36
br label %25, !dbg !37

25: ; preds = %21, %18
call void @llvm.dbg.declare(metadata i32* %6, metadata !38, metadata !DIExpression()), !dbg !39
store i32 7, i32* %6, align 4, !dbg !39
%26 = load i32, i32* %6, align 4, !dbg !40
#dbg_declare(ptr %6, !38, !DIExpression(), !39)
store i32 7, ptr %6, align 4, !dbg !39
%26 = load i32, ptr %6, align 4, !dbg !40
call void @fn2(i32 noundef %26), !dbg !41
%27 = load i32, i32* %5, align 4, !dbg !42
%27 = load i32, ptr %5, align 4, !dbg !42
%28 = add nsw i32 %27, -1, !dbg !42
store i32 %28, i32* %5, align 4, !dbg !42
store i32 %28, ptr %5, align 4, !dbg !42
ret void, !dbg !43
}

; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)

declare void @fn2(i32 noundef)

; Function Attrs: noinline nounwind optnone uwtable
define dso_local i32 @f() !dbg !44 {
%1 = alloca i32, align 4
%2 = alloca i32, align 4
call void @llvm.dbg.declare(metadata i32* %1, metadata !47, metadata !DIExpression()), !dbg !48
call void @llvm.dbg.declare(metadata i32* %2, metadata !49, metadata !DIExpression()), !dbg !50
call void @fn3(i32* noundef %1), !dbg !51
call void @fn3(i32* noundef %2), !dbg !52
%3 = load i32, i32* %1, align 4, !dbg !53
%4 = load i32, i32* %2, align 4, !dbg !54
#dbg_declare(ptr %1, !47, !DIExpression(), !48)
#dbg_declare(ptr %2, !49, !DIExpression(), !50)
call void @fn3(ptr noundef %1), !dbg !51
call void @fn3(ptr noundef %2), !dbg !52
%3 = load i32, ptr %1, align 4, !dbg !53
%4 = load i32, ptr %2, align 4, !dbg !54
call void @fn1(i32 noundef %3, i32 noundef %4), !dbg !55
ret i32 0, !dbg !56
}

declare void @fn3(i32* noundef)
declare void @fn3(ptr noundef)

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7, !8}
!llvm.ident = !{!9}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.6", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 19.1.7", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 7, !"PIC Level", i32 2}
!5 = !{i32 8, !"PIC Level", i32 2}
!6 = !{i32 7, !"PIE Level", i32 2}
!7 = !{i32 7, !"uwtable", i32 1}
!7 = !{i32 7, !"uwtable", i32 2}
!8 = !{i32 7, !"frame-pointer", i32 2}
!9 = !{!"clang version 14.0.6"}
!9 = !{!"clang version 19.1.7"}
!10 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 5, type: !11, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !14)
!11 = !DISubroutineType(types: !12)
!12 = !{null, !13, !13}
Expand Down
12 changes: 6 additions & 6 deletions llvm/test/tools/llvm-dwarfdump/X86/coverage.test
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Expand Up @@ -16,9 +16,9 @@ RUN: llvm-dwarfdump --show-variable-coverage --combine-inline-variable-instances

COMBINE: Variable coverage statistics:
COMBINE-NEXT: Function InstanceCount Variable Decl LinesCovered
COMBINE-NEXT: f 1 k test.c:22 2
COMBINE-NEXT: f 1 l test.c:22 3
COMBINE-NEXT: fn1 1 a test.c:14 1
COMBINE-NEXT: fn1 1 u test.c:7 1
COMBINE-NEXT: fn1 1 x test.c:5 1
COMBINE-NEXT: fn1 1 y test.c:5 1
COMBINE-NEXT: f 1 k test.c:22 5
COMBINE-NEXT: f 1 l test.c:22 5
COMBINE-NEXT: fn1 1 a test.c:14 0
COMBINE-NEXT: fn1 1 u test.c:7 0
COMBINE-NEXT: fn1 1 x test.c:5 0
COMBINE-NEXT: fn1 1 y test.c:5 0
Comment on lines +19 to +24
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@SLTozer SLTozer Dec 17, 2025 •
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Results here look a little odd; all the fn1 variables other than a were made fully undef in the most recent change, but even a has a 0 line coverage here even though it should have full coverage in fn1; is this happening because fn1 is ending up with 0 scope lines, or is there some problem with the logic for finding the scope lines? (Also k and l have changed results as well; possibly the fn1 results are being miscounted as being in f, and thus all the scope lines for fn1 are being counted for f variables? Something to look into either way).

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