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1; RUN: opt -passes=redundant-dbg-inst-elim -S %s -o - \2; RUN: | FileCheck %s --implicit-check-not="#dbg_"3 4;; Hand-written. Test how RemoveRedundantDbgInstrs interacts with dbg.assign5;; intrinsics. FileCehck directives are inline.6 7define dso_local void @_Z1fv() !dbg !7 {8entry:9 %test = alloca i32, align 4, !DIAssignID !2010; CHECK: alloca11;; Forward scan: This dbg.assign for Local2 contains an undef value component12;; in the entry block and is the first debug intrinsic for the variable, but is13;; linked to an instruction so should not be deleted.14; CHECK-NEXT: #dbg_assign(i1 undef, ![[Local2:[0-9]+]]15 call void @llvm.dbg.assign(metadata i1 undef, metadata !19, metadata !DIExpression(), metadata !20, metadata ptr %test, metadata !DIExpression()), !dbg !1416 17;; Forward scan: dbg.assign for Local unlinked with undef value component, in18;; the enrty bock and seen before any non-undefs; delete it.19; CHECK-NEXT: @step()20 call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1421 call void @step()22 23;; Forward scan: Repeat the previous test to check it works more than once.24; CHECK-NEXT: @step()25 call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1426 call void @step()27 28;; Backward scan: Check that a dbg.value made redundant by a dbg.assign is29;; removed.30;; CHECK-NEXT: #dbg_assign(i32 1, ![[Local:[0-9]+]]31;; CHECK-NEXT: @step()32 call void @llvm.dbg.value(metadata i32 0, metadata !11, metadata !DIExpression()), !dbg !1433 call void @llvm.dbg.assign(metadata i32 1, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1434 call void @step()35 36;; Backward scan: Check that a dbg.assign made redundant by a dbg.value is37;; removed.38;; CHECK-NEXT: #dbg_value(i32 3, ![[Local:[0-9]+]]39;; CHECK-NEXT: @step()40 call void @llvm.dbg.assign(metadata i32 2, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1441 call void @llvm.dbg.value(metadata i32 3, metadata !11, metadata !DIExpression()), !dbg !1442 call void @step()43 44;; Forward scan: This unlinked dbg.assign(3, ...) is shadowed by the45;; dbg.value(3,...) above. Check it is removed.46;; CHECK-NEXT: @step()47 call void @llvm.dbg.assign(metadata i32 3, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1448 call void @step()49 50;; Forward scan: Same as above except this dbg.assign is shadowed by51;; another dbg.assign rather than a dbg.value. Check it is removed.52;; CHECK-NEXT: @step()53 call void @llvm.dbg.assign(metadata i32 3, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1454 call void @step()55 56;; Forward scan: We've seen non-undef dbg intrinsics for Local in the entry57;; block so we shouldn't delete this undef.58; CHECK-NEXT: #dbg_assign(i32 undef, ![[Local]]59 call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !1460 br label %next61 62next:63;; Forward scan: Do not delete undef dbg.assigns from non-entry blocks.64; CHECK: #dbg_assign(i32 undef, ![[Local2]]65; CHECK-NEXT: @step()66 call void @llvm.dbg.assign(metadata i32 undef, metadata !19, metadata !DIExpression(), metadata !21, metadata ptr %test, metadata !DIExpression()), !dbg !1467 call void @step()68 69;; Forward scan: The next dbg.assign would be made redundant by this dbg.value70;; if it were not for the fact that it is linked to an instruction. Ensure it71;; isn't removed.72;; Backward scan: It (the next dbg.assign) is also followed by another for the73;; same variable - check it isn't remove (because it's linked).74; CHECK-NEXT: #dbg_value(i32 0, ![[Local2]]75; CHECK-NEXT: store76; CHECK-NEXT: store77; CHECK-NEXT: #dbg_assign(i32 0, ![[Local2]]78; CHECK-NEXT: #dbg_assign(i32 1, ![[Local2]]79 call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !1480 store i32 0, ptr %test, !DIAssignID !1781 store i32 1, ptr %test, !DIAssignID !1682 call void @llvm.dbg.assign(metadata i32 0, metadata !19, metadata !DIExpression(), metadata !17, metadata ptr %test, metadata !DIExpression()), !dbg !1483 call void @llvm.dbg.assign(metadata i32 1, metadata !19, metadata !DIExpression(), metadata !16, metadata ptr %test, metadata !DIExpression()), !dbg !1484 ret void, !dbg !1885}86 87; CHECK-DAG: ![[Local2]] = !DILocalVariable(name: "Local2",88; CHECK-DAG: ![[Local]] = !DILocalVariable(name: "Local",89 90declare dso_local void @step()91declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)92declare void @llvm.dbg.value(metadata, metadata, metadata)93 94!llvm.dbg.cu = !{!0}95!llvm.module.flags = !{!2, !3, !4, !5, !1000}96!llvm.ident = !{!6}97 98!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)99!1 = !DIFile(filename: "test.cpp", directory: "/")100!2 = !{i32 7, !"Dwarf Version", i32 5}101!3 = !{i32 2, !"Debug Info Version", i32 3}102!4 = !{i32 1, !"wchar_size", i32 4}103!5 = !{i32 7, !"uwtable", i32 1}104!6 = !{!"clang version 14.0.0"}105!7 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)106!8 = !DISubroutineType(types: !9)107!9 = !{null}108!10 = !{!11, !19}109!11 = !DILocalVariable(name: "Local", scope: !7, file: !1, line: 2, type: !12)110!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)111!13 = distinct !DIAssignID()112!14 = !DILocation(line: 0, scope: !7)113!15 = distinct !DIAssignID()114!16 = distinct !DIAssignID()115!17 = distinct !DIAssignID()116!18 = !DILocation(line: 6, column: 1, scope: !7)117!19 = !DILocalVariable(name: "Local2", scope: !7, file: !1, line: 2, type: !12)118!20 = distinct !DIAssignID()119!21 = distinct !DIAssignID()120!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}121