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[DebugInfo] Add Verifier check for incorrectly-scoped retainedNodes #166855

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[DebugInfo] Add Verifier check for incorrectly-scoped retainedNodes #166855

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42ce245
[DebugInfo] Add Verifier check for incorrectly-scoped retainedNodes
dzhidzhoev Nov 3, 2025
4cddd97
No else after return
dzhidzhoev Nov 7, 2025
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4 changes: 2 additions & 2 deletions llvm/include/llvm/IR/DebugInfo.h
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Expand Up @@ -108,7 +108,7 @@ class DebugInfoFinder {
LLVM_ABI void processInstruction(const Module &M, const Instruction &I);

/// Process a DILocalVariable.
LLVM_ABI void processVariable(DILocalVariable *DVI);
LLVM_ABI void processVariable(const DILocalVariable *DVI);
/// Process debug info location.
LLVM_ABI void processLocation(const Module &M, const DILocation *Loc);
/// Process a DbgRecord.
Expand All @@ -124,7 +124,7 @@ class DebugInfoFinder {
void processCompileUnit(DICompileUnit *CU);
void processScope(DIScope *Scope);
void processType(DIType *DT);
void processImportedEntity(DIImportedEntity *Import);
void processImportedEntity(const DIImportedEntity *Import);
bool addCompileUnit(DICompileUnit *CU);
bool addGlobalVariable(DIGlobalVariableExpression *DIG);
bool addScope(DIScope *Scope);
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34 changes: 34 additions & 0 deletions llvm/include/llvm/IR/DebugInfoMetadata.h
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Expand Up @@ -2554,6 +2554,40 @@ class DISubprogram : public DILocalScope {
replaceOperandWith(7, N.get());
}

/// For the given retained node of DISubprogram, applies one of the
/// given functions depending on the type of the node.
template <typename T, typename FuncLVT, typename FuncLabelT,
typename FuncImportedEntityT, typename FuncUnknownT>
static T
visitRetainedNode(const Metadata *N, FuncLVT &&FuncLV, FuncLabelT &&FuncLabel,
FuncImportedEntityT &&FuncIE, FuncUnknownT &&FuncUnknown) {
if (const auto *LV = dyn_cast<DILocalVariable>(N))
return FuncLV(LV);
else if (const auto *L = dyn_cast<DILabel>(N))
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@arsenm arsenm Nov 6, 2025

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No else after return

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@dzhidzhoev dzhidzhoev Nov 7, 2025

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Fixed

return FuncLabel(L);
else if (const auto *IE = dyn_cast<DIImportedEntity>(N))
return FuncIE(IE);
else
return FuncUnknown(N);
}

/// Returns the scope of subprogram's retainedNodes.
static const DILocalScope *getRetainedNodeScope(const MDNode *N);
// For use in Verifier.
static const DIScope *getRawRetainedNodeScope(const MDNode *N);

/// For each retained node, applies one of the given functions depending
/// on the type of a node.
template <typename FuncLVT, typename FuncLabelT, typename FuncImportedEntityT>
void forEachRetainedNode(FuncLVT &&FuncLV, FuncLabelT &&FuncLabel,
FuncImportedEntityT &&FuncIE) const {
for (MDNode *N : getRetainedNodes())
visitRetainedNode<void>(N, FuncLV, FuncLabel, FuncIE,
[](const Metadata *N) {
llvm_unreachable("Unexpected retained node!");
});
}

/// Check if this subprogram describes the given function.
///
/// FIXME: Should this be looking through bitcasts?
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12 changes: 1 addition & 11 deletions llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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Expand Up @@ -1544,18 +1544,8 @@ void DwarfDebug::ensureAbstractEntityIsCreatedIfScoped(DwarfCompileUnit &CU,
}

static const DILocalScope *getRetainedNodeScope(const MDNode *N) {
const DIScope *S;
if (const auto *LV = dyn_cast<DILocalVariable>(N))
S = LV->getScope();
else if (const auto *L = dyn_cast<DILabel>(N))
S = L->getScope();
else if (const auto *IE = dyn_cast<DIImportedEntity>(N))
S = IE->getScope();
else
llvm_unreachable("Unexpected retained node!");

// Ensure the scope is not a DILexicalBlockFile.
return cast<DILocalScope>(S)->getNonLexicalBlockFileScope();
return DISubprogram::getRetainedNodeScope(N)->getNonLexicalBlockFileScope();
}

// Collect variable information from side table maintained by MF.
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14 changes: 6 additions & 8 deletions llvm/lib/IR/DebugInfo.cpp
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Expand Up @@ -247,7 +247,7 @@ void DebugInfoFinder::processType(DIType *DT) {
}
}

void DebugInfoFinder::processImportedEntity(DIImportedEntity *Import) {
void DebugInfoFinder::processImportedEntity(const DIImportedEntity *Import) {
auto *Entity = Import->getEntity();
if (auto *T = dyn_cast<DIType>(Entity))
processType(T);
Expand Down Expand Up @@ -307,15 +307,13 @@ void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
}
}

for (auto *N : SP->getRetainedNodes()) {
if (auto *Var = dyn_cast_or_null<DILocalVariable>(N))
processVariable(Var);
else if (auto *Import = dyn_cast_or_null<DIImportedEntity>(N))
processImportedEntity(Import);
}
SP->forEachRetainedNode(
[this](const DILocalVariable *LV) { processVariable(LV); },
[](const DILabel *L) {},
[this](const DIImportedEntity *IE) { processImportedEntity(IE); });
}

void DebugInfoFinder::processVariable(DILocalVariable *DV) {
void DebugInfoFinder::processVariable(const DILocalVariable *DV) {
if (!NodesSeen.insert(DV).second)
return;
processScope(DV->getScope());
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13 changes: 13 additions & 0 deletions llvm/lib/IR/DebugInfoMetadata.cpp
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Expand Up @@ -1441,6 +1441,19 @@ bool DISubprogram::describes(const Function *F) const {
assert(F && "Invalid function");
return F->getSubprogram() == this;
}

const DIScope *DISubprogram::getRawRetainedNodeScope(const MDNode *N) {
return visitRetainedNode<DIScope *>(
N, [](const DILocalVariable *LV) { return LV->getScope(); },
[](const DILabel *L) { return L->getScope(); },
[](const DIImportedEntity *IE) { return IE->getScope(); },
[](const Metadata *N) { return nullptr; });
}

const DILocalScope *DISubprogram::getRetainedNodeScope(const MDNode *N) {
return cast<DILocalScope>(getRawRetainedNodeScope(N));
}

DILexicalBlockBase::DILexicalBlockBase(LLVMContext &C, unsigned ID,
StorageType Storage,
ArrayRef<Metadata *> Ops)
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20 changes: 18 additions & 2 deletions llvm/lib/IR/Verifier.cpp
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Expand Up @@ -1559,11 +1559,27 @@ void Verifier::visitDISubprogram(const DISubprogram &N) {
auto *Node = dyn_cast<MDTuple>(RawNode);
CheckDI(Node, "invalid retained nodes list", &N, RawNode);
for (Metadata *Op : Node->operands()) {
CheckDI(Op && (isa<DILocalVariable>(Op) || isa<DILabel>(Op) ||
isa<DIImportedEntity>(Op)),
CheckDI(Op, "nullptr in retained nodes", &N, Node);

auto True = [](const Metadata *) { return true; };
auto False = [](const Metadata *) { return false; };
bool IsTypeCorrect =
DISubprogram::visitRetainedNode<bool>(Op, True, True, True, False);
CheckDI(IsTypeCorrect,
"invalid retained nodes, expected DILocalVariable, DILabel or "
"DIImportedEntity",
&N, Node, Op);

auto *RetainedNode = cast<DINode>(Op);
auto *RetainedNodeScope = dyn_cast_or_null<DILocalScope>(
DISubprogram::getRawRetainedNodeScope(RetainedNode));
CheckDI(RetainedNodeScope,
"invalid retained nodes, retained node is not local", &N, Node,
RetainedNode);
CheckDI(
RetainedNodeScope->getSubprogram() == &N,
"invalid retained nodes, retained node does not belong to subprogram",
&N, Node, RetainedNode, RetainedNodeScope);
}
}
CheckDI(!hasConflictingReferenceFlags(N.getFlags()),
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/X86/StackColoring-dbg-invariance.mir
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Expand Up @@ -55,7 +55,7 @@
!9 = !DILocalVariable(name: "4", scope: !5, file: !1, line: 4, type: !10)
!10 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
!11 = !DILocation(line: 4, column: 1, scope: !5)
!12 = distinct !DISubprogram(name: "test_2", linkageName: "test_2", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
!12 = distinct !DISubprogram(name: "test_2", linkageName: "test_2", scope: null, file: !1, line: 1, type: !6, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !7)

...
---
Expand Down
3 changes: 2 additions & 1 deletion llvm/test/DebugInfo/MIR/X86/clobbered-fragments.mir
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Expand Up @@ -85,10 +85,11 @@
!15 = !DISubrange(count: 3)
!16 = !DILocation(line: 8, scope: !8)
!17 = !DILocation(line: 9, scope: !8)
!18 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !11)
!18 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 7, type: !9, scopeLine: 7, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !1, retainedNodes: !22)
!19 = !DILocalVariable(name: "local", scope: !18, file: !2, line: 8, type: !13)
!20 = !DILocation(line: 15, scope: !18)
!21 = !DILocation(line: 16, scope: !18)
!22 = !{!19}

...
---
Expand Down
5 changes: 3 additions & 2 deletions llvm/test/DebugInfo/MIR/X86/machine-cse.mir
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Expand Up @@ -73,13 +73,14 @@
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "beards", isOptimized: true, runtimeVersion: 4, emissionKind: FullDebug)
!2 = !DIFile(filename: "bees.cpp", directory: "")
!3 = distinct !DISubprogram(name: "nope", scope: !1, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !8)
!33 = distinct !DISubprogram(name: "alsonope", scope: !1, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !8)
!3 = distinct !DISubprogram(name: "nope", scope: !1, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !9)
!33 = distinct !DISubprogram(name: "alsonope", scope: !1, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !9)
!4 = !DILocalVariable(name: "bees", scope: !3, type: !5)
!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !DILocation(line: 0, scope: !3)
!8 = !{!4}
!9 = !{}


; CHECK: ![[METAVAR:[0-9]+]] = !DILocalVariable(name: "bees",
Expand Down
10 changes: 5 additions & 5 deletions llvm/test/DebugInfo/MIR/X86/remove-redundant-dbg-vals.mir
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Expand Up @@ -139,15 +139,15 @@
!23 = !DISubprogram(name: "bar", scope: !1, file: !1, line: 1, type: !24, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
!24 = !DISubroutineType(types: !25)
!25 = !{null, !11}
!26 = distinct !DISubprogram(name: "foo2", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!26 = distinct !DISubprogram(name: "foo2", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!27 = !DILocation(line: 0, scope: !26)
!28 = distinct !DISubprogram(name: "foo3", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!28 = distinct !DISubprogram(name: "foo3", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!29 = !DILocation(line: 0, scope: !28)
!30 = distinct !DISubprogram(name: "foo4", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!30 = distinct !DISubprogram(name: "foo4", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!31 = !DILocation(line: 0, scope: !30)
!32 = distinct !DISubprogram(name: "foo5", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!32 = distinct !DISubprogram(name: "foo5", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!33 = !DILocation(line: 0, scope: !32)
!34 = distinct !DISubprogram(name: "foo6", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
!34 = distinct !DISubprogram(name: "foo6", scope: !1, file: !1, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!35 = !DILocation(line: 0, scope: !34)

...
Expand Down
12 changes: 8 additions & 4 deletions llvm/test/DebugInfo/X86/instr-ref-selectiondag.ll
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Expand Up @@ -281,15 +281,19 @@ lala:
!11 = !{!13}
!13 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 6, type: !10)
!14 = !DILocation(line: 1, scope: !7)
!20 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!20 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)
!21 = !DILocalVariable(name: "xyzzy", scope: !20, file: !1, line: 6, type: !10)
!22 = !DILocation(line: 1, scope: !20)
!30 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!23 = !{!21}
!30 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !33)
!31 = !DILocalVariable(name: "xyzzy", scope: !30, file: !1, line: 6, type: !10)
!32 = !DILocation(line: 1, scope: !30)
!40 = distinct !DISubprogram(name: "qux", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!33 = !{!31}
!40 = distinct !DISubprogram(name: "qux", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !46)
!41 = !DILocalVariable(name: "socks", scope: !40, file: !1, line: 6, type: !10)
!42 = !DILocation(line: 1, scope: !40)
!43 = distinct !DISubprogram(name: "inlined", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!43 = distinct !DISubprogram(name: "inlined", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !47)
!44 = !DILocation(line: 0, scope: !43, inlinedAt: !42)
!45 = !DILocalVariable(name: "knees", scope: !43, file: !1, line: 6, type: !10)
!46 = !{!41}
!47 = !{!45}
9 changes: 6 additions & 3 deletions llvm/test/DebugInfo/X86/live-debug-values-constprop.mir
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Expand Up @@ -82,15 +82,18 @@
!14 = !DISubroutineType(types: !15)
!15 = !{!16}
!16 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!40 = distinct !DISubprogram(name: "bar", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!40 = distinct !DISubprogram(name: "bar", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !43, type: !14, isDefinition: true)
!41 = !DILocalVariable(name: "towel", scope: !40, file: !2, line: 1, type: !16)
!42 = !DILocation(line: 40, scope: !40)
!80 = distinct !DISubprogram(name: "baz", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!43 = !{!41}
!80 = distinct !DISubprogram(name: "baz", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !83, type: !14, isDefinition: true)
!81 = !DILocalVariable(name: "socks", scope: !80, file: !2, line: 1, type: !16)
!82 = !DILocation(line: 40, scope: !80)
!120 = distinct !DISubprogram(name: "qux", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
!83 = !{!81}
!120 = distinct !DISubprogram(name: "qux", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !123, type: !14, isDefinition: true)
!121 = !DILocalVariable(name: "shoes", scope: !120, file: !2, line: 1, type: !16)
!122 = !DILocation(line: 40, scope: !120)
!123 = !{!121}

...
---
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/DebugInfo/X86/live-debug-values-remove-range.ll
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Expand Up @@ -108,6 +108,6 @@ exit:
!106 = !DILocation(line: 1, scope: !104)
!113 = !{!103}
!203 = !DILocalVariable(name: "teacake", scope: !204, file: !2, line: 1, type: !16)
!204 = distinct !DISubprogram(name: "toad", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !113, type: !14, isDefinition: true)
!204 = distinct !DISubprogram(name: "toad", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !213, type: !14, isDefinition: true)
!206 = !DILocation(line: 1, scope: !204)
!213 = !{!203}
2 changes: 1 addition & 1 deletion llvm/test/DebugInfo/X86/live-debug-vars-intervals.mir
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Expand Up @@ -91,7 +91,7 @@
!10 = !{!11}
!11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !1, line: 3, type: !9)
!12 = !DILocation(line: 3, column: 12, scope: !6)
!13 = distinct !DISubprogram(name: "f2", scope: !1, file: !1, line: 20, type: !7, scopeLine: 20, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
!13 = distinct !DISubprogram(name: "f2", scope: !1, file: !1, line: 20, type: !7, scopeLine: 20, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !{!14})
!14 = !DILocalVariable(name: "x", arg: 1, scope: !13, file: !1, line: 21, type: !9)
!15 = !DILocation(line: 23, column: 12, scope: !13)

Expand Down
4 changes: 2 additions & 2 deletions llvm/test/Linker/thinlto_funcimport_debug.ll
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Expand Up @@ -80,8 +80,8 @@ attributes #1 = { nounwind readnone }
!26 = !DILocation(line: 9, column: 3, scope: !4)
!27 = distinct !DISubprogram(name: "func3", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !28)
!28 = !{!29}
!29 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)
!29 = !DILocalVariable(name: "n", arg: 1, scope: !27, file: !1, line: 8, type: !33)
!30 = distinct !DISubprogram(name: "func4", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !31)
!31 = !{!32}
!32 = !DILocalVariable(name: "n", arg: 1, scope: !30, file: !1, line: 8, type: !7)

!33 = !DIDerivedType(tag: DW_TAG_typedef, name: "size_t", scope: !30, file: !1, line: 13, baseType: !7)
6 changes: 3 additions & 3 deletions llvm/test/Transforms/CodeExtractor/PartialInlineDebug.ll
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Expand Up @@ -96,11 +96,11 @@ entry:
!13 = !DILocalVariable(name: "v", arg: 1, scope: !8, file: !1, line: 3, type: !11)
!14 = !DILocation(line: 5, column: 10, scope: !8)
!15 = distinct !DILexicalBlock(scope: !16, file: !1, line: 9, column: 7)
!16 = distinct !DISubprogram(name: "callee", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!16 = distinct !DISubprogram(name: "callee", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
!17 = !DILocation(line: 10, column: 7, scope: !15)
!18 = distinct !DISubprogram(name: "callee2", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!18 = distinct !DISubprogram(name: "callee2", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
!19 = distinct !DILexicalBlock(scope: !18, file: !1, line: 100, column: 1)
!20 = !DILocation(line: 110, column: 17, scope: !19)
!21 = distinct !DISubprogram(name: "caller2", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!21 = distinct !DISubprogram(name: "caller2", scope: !1, file: !1, line: 8, type: !9, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
!22 = !DILocation(line: 110, column: 17, scope: !21)
!23 = !DILocation(line: 15, column: 7, scope: !15)
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