120 lines
6.4 KiB
LLVM
120 lines
6.4 KiB
LLVM
; RUN: opt -passes=redundant-dbg-inst-elim -S %s -o - -experimental-assignment-tracking \
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; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
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;; Hand-written. Test how RemoveRedundantDbgInstrs interacts with dbg.assign
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;; intrinsics. FileCehck directives are inline.
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define dso_local void @_Z1fv() !dbg !7 {
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entry:
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%test = alloca i32, align 4, !DIAssignID !20
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; CHECK: alloca
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;; Forward scan: This dbg.assign for Local2 contains an undef value component
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;; in the entry block and is the first debug intrinsic for the variable, but is
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;; linked to an instruction so should not be deleted.
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; CHECK-NEXT: call void @llvm.dbg.assign(metadata i1 undef, metadata ![[Local2:[0-9]+]]
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call void @llvm.dbg.assign(metadata i1 undef, metadata !19, metadata !DIExpression(), metadata !20, metadata ptr %test, metadata !DIExpression()), !dbg !14
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;; Forward scan: dbg.assign for Local unlinked with undef value component, in
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;; the enrty bock and seen before any non-undefs; delete it.
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; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Forward scan: Repeat the previous test to check it works more than once.
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; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Backward scan: Check that a dbg.value made redundant by a dbg.assign is
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;; removed.
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;; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 1, metadata ![[Local:[0-9]+]]
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;; CHECK-NEXT: @step()
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call void @llvm.dbg.value(metadata i32 0, metadata !11, metadata !DIExpression()), !dbg !14
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call void @llvm.dbg.assign(metadata i32 1, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Backward scan: Check that a dbg.assign made redundant by a dbg.value is
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;; removed.
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;; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 3, metadata ![[Local:[0-9]+]]
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;; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 2, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @llvm.dbg.value(metadata i32 3, metadata !11, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Forward scan: This unlinked dbg.assign(3, ...) is shadowed by the
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;; dbg.value(3,...) above. Check it is removed.
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;; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 3, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Forward scan: Same as above except this dbg.assign is shadowed by
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;; another dbg.assign rather than a dbg.value. Check it is removed.
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;; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 3, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Forward scan: We've seen non-undef dbg intrinsics for Local in the entry
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;; block so we shouldn't delete this undef.
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; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 undef, metadata ![[Local]]
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call void @llvm.dbg.assign(metadata i32 undef, metadata !11, metadata !DIExpression(), metadata !15, metadata ptr undef, metadata !DIExpression()), !dbg !14
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br label %next
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next:
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;; Forward scan: Do not delete undef dbg.assigns from non-entry blocks.
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; CHECK: call void @llvm.dbg.assign(metadata i32 undef, metadata ![[Local2]]
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; CHECK-NEXT: @step()
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call void @llvm.dbg.assign(metadata i32 undef, metadata !19, metadata !DIExpression(), metadata !21, metadata ptr %test, metadata !DIExpression()), !dbg !14
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call void @step()
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;; Forward scan: The next dbg.assign would be made redundant by this dbg.value
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;; if it were not for the fact that it is linked to an instruction. Ensure it
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;; isn't removed.
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;; Backward scan: It (the next dbg.assign) is also followed by another for the
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;; same variable - check it isn't remove (because it's linked).
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 0, metadata ![[Local2]]
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; CHECK-NEXT: store
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; CHECK-NEXT: store
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; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 0, metadata ![[Local2]]
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; CHECK-NEXT: call void @llvm.dbg.assign(metadata i32 1, metadata ![[Local2]]
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call void @llvm.dbg.value(metadata i32 0, metadata !19, metadata !DIExpression()), !dbg !14
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store i32 0, ptr %test, !DIAssignID !17
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store i32 1, ptr %test, !DIAssignID !16
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call void @llvm.dbg.assign(metadata i32 0, metadata !19, metadata !DIExpression(), metadata !17, metadata ptr %test, metadata !DIExpression()), !dbg !14
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call void @llvm.dbg.assign(metadata i32 1, metadata !19, metadata !DIExpression(), metadata !16, metadata ptr %test, metadata !DIExpression()), !dbg !14
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ret void, !dbg !18
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}
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; CHECK-DAG: ![[Local2]] = !DILocalVariable(name: "Local2",
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; CHECK-DAG: ![[Local]] = !DILocalVariable(name: "Local",
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declare dso_local void @step()
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5}
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!llvm.ident = !{!6}
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!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)
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!1 = !DIFile(filename: "test.cpp", directory: "/")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"uwtable", i32 1}
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!6 = !{!"clang version 14.0.0"}
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!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)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !{!11, !19}
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!11 = !DILocalVariable(name: "Local", scope: !7, file: !1, line: 2, type: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = distinct !DIAssignID()
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!14 = !DILocation(line: 0, scope: !7)
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!15 = distinct !DIAssignID()
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!16 = distinct !DIAssignID()
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!17 = distinct !DIAssignID()
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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!19 = !DILocalVariable(name: "Local2", scope: !7, file: !1, line: 2, type: !12)
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!20 = distinct !DIAssignID()
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!21 = distinct !DIAssignID()
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