Author: Vladislav Dzhidzhoev
Date: 2025-09-23T19:36:33+02:00
New Revision: 0240295c21020e869f92c162ce80785f13dac358

URL: 
https://github.com/llvm/llvm-project/commit/0240295c21020e869f92c162ce80785f13dac358
DIFF: 
https://github.com/llvm/llvm-project/commit/0240295c21020e869f92c162ce80785f13dac358.diff

LOG: Revert "[DebugInfo][DwarfDebug] Separate creation and population of 
abstract …"

This reverts commit 432b58915ad7257c432a403efe194e5033a53ab0.

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/DebugHandlerBase.h
    llvm/include/llvm/CodeGen/LexicalScopes.h
    llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
    llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
    llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
    llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
    llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
    llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
    llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
    llvm/lib/CodeGen/LexicalScopes.cpp
    llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
    llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
    llvm/lib/CodeGen/LiveDebugVariables.cpp
    llvm/test/CodeGen/X86/dbg-distringtype-uint.ll
    llvm/unittests/CodeGen/InstrRefLDVTest.cpp
    llvm/unittests/CodeGen/LexicalScopesTest.cpp
    llvm/unittests/CodeGen/MFCommon.inc

Removed: 
    llvm/test/DebugInfo/AArch64/debug-types.ll
    llvm/test/DebugInfo/AArch64/populate-abstract-sp-once.ll
    llvm/test/DebugInfo/Generic/inlined-static-var.ll


################################################################################
diff  --git a/llvm/include/llvm/CodeGen/DebugHandlerBase.h 
b/llvm/include/llvm/CodeGen/DebugHandlerBase.h
index fee4bb116bb87..2849497f9a43e 100644
--- a/llvm/include/llvm/CodeGen/DebugHandlerBase.h
+++ b/llvm/include/llvm/CodeGen/DebugHandlerBase.h
@@ -144,8 +144,6 @@ class DebugHandlerBase : public AsmPrinterHandler {
   static bool isUnsignedDIType(const DIType *Ty);
 
   const InstructionOrdering &getInstOrdering() const { return InstOrdering; }
-
-  const LexicalScopes &getLexicalScopes() const { return LScopes; }
 };
 
 } // namespace llvm

diff  --git a/llvm/include/llvm/CodeGen/LexicalScopes.h 
b/llvm/include/llvm/CodeGen/LexicalScopes.h
index 993df54c05ad5..4172e90b4c1b9 100644
--- a/llvm/include/llvm/CodeGen/LexicalScopes.h
+++ b/llvm/include/llvm/CodeGen/LexicalScopes.h
@@ -141,18 +141,12 @@ class LexicalScopes {
 public:
   LexicalScopes() = default;
 
-  /// Scan module to build subprogram-to-function map.
-  LLVM_ABI void initialize(const Module &);
-
   /// Scan machine function and constuct lexical scope nest, resets
   /// the instance if necessary.
-  LLVM_ABI void scanFunction(const MachineFunction &);
-
-  /// Reset the instance so that it's prepared for another module.
-  LLVM_ABI void resetModule();
+  LLVM_ABI void initialize(const MachineFunction &);
 
-  /// Reset the instance so that it's prepared for another function.
-  LLVM_ABI void resetFunction();
+  /// Release memory.
+  LLVM_ABI void reset();
 
   /// Return true if there is any lexical scope information available.
   bool empty() { return CurrentFnLexicalScope == nullptr; }
@@ -202,11 +196,6 @@ class LexicalScopes {
   /// Find or create an abstract lexical scope.
   LLVM_ABI LexicalScope *getOrCreateAbstractScope(const DILocalScope *Scope);
 
-  /// Get function to which the given subprogram is attached, if exists.
-  const Function *getFunction(const DISubprogram *SP) const {
-    return FunctionMap.lookup(SP);
-  }
-
 private:
   /// Find lexical scope for the given Scope/IA. If not available
   /// then create new lexical scope.
@@ -236,9 +225,6 @@ class LexicalScopes {
 
   const MachineFunction *MF = nullptr;
 
-  /// Mapping between DISubprograms and IR functions.
-  DenseMap<const DISubprogram *, const Function *> FunctionMap;
-
   /// Tracks the scopes in the current function.
   // Use an unordered_map to ensure value pointer validity over insertion.
   std::unordered_map<const DILocalScope *, LexicalScope> LexicalScopeMap;

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp 
b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
index d98d18035ac6d..0f3ff985974ce 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
@@ -105,8 +105,6 @@ DebugHandlerBase::~DebugHandlerBase() = default;
 void DebugHandlerBase::beginModule(Module *M) {
   if (M->debug_compile_units().empty())
     Asm = nullptr;
-  else
-    LScopes.initialize(*M);
 }
 
 // Each LexicalScope has first instruction and last instruction to mark
@@ -271,7 +269,7 @@ void DebugHandlerBase::beginFunction(const MachineFunction 
*MF) {
 
   // Grab the lexical scopes for the function, if we don't have any of those
   // then we're not going to be able to do anything.
-  LScopes.scanFunction(*MF);
+  LScopes.initialize(*MF);
   if (LScopes.empty()) {
     beginFunctionImpl(MF);
     return;

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp 
b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 7ce014e9fac9a..67f526fe91464 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -537,9 +537,8 @@ void DwarfCompileUnit::addWasmRelocBaseGlobal(DIELoc *Loc, 
StringRef GlobalName,
 // and DW_AT_high_pc attributes. If there are global variables in this
 // scope then create and insert DIEs for these variables.
 DIE &DwarfCompileUnit::updateSubprogramScopeDIE(const DISubprogram *SP,
-                                                const Function &F,
                                                 MCSymbol *LineTableSym) {
-  DIE *SPDie = getOrCreateSubprogramDIE(SP, &F, includeMinimalInlineScopes());
+  DIE *SPDie = getOrCreateSubprogramDIE(SP, includeMinimalInlineScopes());
   SmallVector<RangeSpan, 2> BB_List;
   // If basic block sections are on, ranges for each basic block section has
   // to be emitted separately.
@@ -1123,10 +1122,9 @@ sortLocalVars(SmallVectorImpl<DbgVariable *> &Input) {
 }
 
 DIE &DwarfCompileUnit::constructSubprogramScopeDIE(const DISubprogram *Sub,
-                                                   const Function &F,
                                                    LexicalScope *Scope,
                                                    MCSymbol *LineTableSym) {
-  DIE &ScopeDIE = updateSubprogramScopeDIE(Sub, F, LineTableSym);
+  DIE &ScopeDIE = updateSubprogramScopeDIE(Sub, LineTableSym);
 
   if (Scope) {
     assert(!Scope->getInlinedAt());
@@ -1200,17 +1198,32 @@ DIE 
*DwarfCompileUnit::createAndAddScopeChildren(LexicalScope *Scope,
   return ObjectPointer;
 }
 
-DIE &DwarfCompileUnit::getOrCreateAbstractSubprogramDIE(
-    const DISubprogram *SP) {
-  if (auto *AbsDef = getAbstractScopeDIEs().lookup(SP))
-    return *AbsDef;
+void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
+    LexicalScope *Scope) {
+  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
+  if (getAbstractScopeDIEs().count(SP))
+    return;
 
-  auto [ContextDIE, ContextCU] = getOrCreateAbstractSubprogramContextDIE(SP);
-  return createAbstractSubprogramDIE(SP, ContextDIE, ContextCU);
-}
+  DIE *ContextDIE;
+  DwarfCompileUnit *ContextCU = this;
+
+  if (includeMinimalInlineScopes())
+    ContextDIE = &getUnitDie();
+  // Some of this is duplicated from DwarfUnit::getOrCreateSubprogramDIE, with
+  // the important distinction that the debug node is not associated with the
+  // DIE (since the debug node will be associated with the concrete DIE, if
+  // any). It could be refactored to some common utility function.
+  else if (auto *SPDecl = SP->getDeclaration()) {
+    ContextDIE = &getUnitDie();
+    getOrCreateSubprogramDIE(SPDecl);
+  } else {
+    ContextDIE = getOrCreateContextDIE(SP->getScope());
+    // The scope may be shared with a subprogram that has already been
+    // constructed in another CU, in which case we need to construct this
+    // subprogram in the same CU.
+    ContextCU = DD->lookupCU(ContextDIE->getUnitDie());
+  }
 
-DIE &DwarfCompileUnit::createAbstractSubprogramDIE(
-    const DISubprogram *SP, DIE *ContextDIE, DwarfCompileUnit *ContextCU) {
   // Passing null as the associated node because the abstract definition
   // shouldn't be found by lookup.
   DIE &AbsDef = ContextCU->createAndAddDIE(dwarf::DW_TAG_subprogram,
@@ -1224,45 +1237,8 @@ DIE &DwarfCompileUnit::createAbstractSubprogramDIE(
                      DD->getDwarfVersion() <= 4 ? std::optional<dwarf::Form>()
                                                 : 
dwarf::DW_FORM_implicit_const,
                      dwarf::DW_INL_inlined);
-
-  return AbsDef;
-}
-
-std::pair<DIE *, DwarfCompileUnit *>
-DwarfCompileUnit::getOrCreateAbstractSubprogramContextDIE(
-    const DISubprogram *SP) {
-  bool Minimal = includeMinimalInlineScopes();
-  bool IgnoreScope = shouldPlaceInUnitDIE(SP, Minimal);
-  DIE *ContextDIE = getOrCreateSubprogramContextDIE(SP, IgnoreScope);
-
-  if (auto *SPDecl = SP->getDeclaration())
-    if (!Minimal)
-      getOrCreateSubprogramDIE(SPDecl, nullptr);
-
-  // The scope may be shared with a subprogram that has already been
-  // constructed in another CU, in which case we need to construct this
-  // subprogram in the same CU.
-  auto *ContextCU = IgnoreScope ? this : 
DD->lookupCU(ContextDIE->getUnitDie());
-
-  return std::make_pair(ContextDIE, ContextCU);
-}
-
-void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
-    LexicalScope *Scope) {
-  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
-
-  // Populate subprogram DIE only once.
-  if (!getFinalizedAbstractSubprograms().insert(SP).second)
-    return;
-
-  auto [ContextDIE, ContextCU] = getOrCreateAbstractSubprogramContextDIE(SP);
-  DIE *AbsDef = getAbstractScopeDIEs().lookup(SP);
-  if (!AbsDef)
-    AbsDef = &createAbstractSubprogramDIE(SP, ContextDIE, ContextCU);
-
-  if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, 
*AbsDef))
-    ContextCU->addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer,
-                           *ObjectPointer);
+  if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, AbsDef))
+    ContextCU->addDIEEntry(AbsDef, dwarf::DW_AT_object_pointer, 
*ObjectPointer);
 }
 
 bool DwarfCompileUnit::useGNUAnalogForDwarf5Feature() const {
@@ -1317,9 +1293,9 @@ 
DwarfCompileUnit::getDwarf5OrGNULocationAtom(dwarf::LocationAtom Loc) const {
 }
 
 DIE &DwarfCompileUnit::constructCallSiteEntryDIE(
-    DIE &ScopeDIE, const DISubprogram *CalleeSP, const Function *CalleeF,
-    bool IsTail, const MCSymbol *PCAddr, const MCSymbol *CallAddr,
-    unsigned CallReg, DIType *AllocSiteTy) {
+    DIE &ScopeDIE, const DISubprogram *CalleeSP, bool IsTail,
+    const MCSymbol *PCAddr, const MCSymbol *CallAddr, unsigned CallReg,
+    DIType *AllocSiteTy) {
   // Insert a call site entry DIE within ScopeDIE.
   DIE &CallSiteDIE = 
createAndAddDIE(getDwarf5OrGNUTag(dwarf::DW_TAG_call_site),
                                      ScopeDIE, nullptr);
@@ -1329,7 +1305,7 @@ DIE &DwarfCompileUnit::constructCallSiteEntryDIE(
     addAddress(CallSiteDIE, getDwarf5OrGNUAttr(dwarf::DW_AT_call_target),
                MachineLocation(CallReg));
   } else if (CalleeSP) {
-    DIE *CalleeDIE = getOrCreateSubprogramDIE(CalleeSP, CalleeF);
+    DIE *CalleeDIE = getOrCreateSubprogramDIE(CalleeSP);
     assert(CalleeDIE && "Could not create DIE for call site entry origin");
     if (AddLinkageNamesToDeclCallOriginsForTuning(DD) &&
         !CalleeSP->isDefinition() &&
@@ -1420,7 +1396,7 @@ DIE *DwarfCompileUnit::constructImportedEntityDIE(
     if (auto *AbsSPDie = getAbstractScopeDIEs().lookup(SP))
       EntityDie = AbsSPDie;
     else
-      EntityDie = getOrCreateSubprogramDIE(SP, nullptr);
+      EntityDie = getOrCreateSubprogramDIE(SP);
   } else if (auto *T = dyn_cast<DIType>(Entity))
     EntityDie = getOrCreateTypeDIE(T);
   else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
@@ -1829,16 +1805,3 @@ DIE *DwarfCompileUnit::getOrCreateContextDIE(const 
DIScope *Context) {
   }
   return DwarfUnit::getOrCreateContextDIE(Context);
 }
-
-DIE *DwarfCompileUnit::getOrCreateSubprogramDIE(const DISubprogram *SP,
-                                                const Function *F,
-                                                bool Minimal) {
-  if (!F && SP->isDefinition()) {
-    F = DD->getLexicalScopes().getFunction(SP);
-
-    if (!F)
-      return &getCU().getOrCreateAbstractSubprogramDIE(SP);
-  }
-
-  return DwarfUnit::getOrCreateSubprogramDIE(SP, F, Minimal);
-}

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h 
b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index a3bbc8364599d..c2f6ca0913818 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -81,7 +81,6 @@ class DwarfCompileUnit final : public DwarfUnit {
 
   // List of abstract local scopes (either DISubprogram or DILexicalBlock).
   DenseMap<const DILocalScope *, DIE *> AbstractLocalScopeDIEs;
-  SmallPtrSet<const DISubprogram *, 8> FinalizedAbstractSubprograms;
 
   // List of inlined lexical block scopes that belong to subprograms within 
this
   // CU.
@@ -138,28 +137,12 @@ class DwarfCompileUnit final : public DwarfUnit {
     return DU->getAbstractEntities();
   }
 
-  auto &getFinalizedAbstractSubprograms() {
-    if (isDwoUnit() && !DD->shareAcrossDWOCUs())
-      return FinalizedAbstractSubprograms;
-    return DU->getFinalizedAbstractSubprograms();
-  }
-
   void finishNonUnitTypeDIE(DIE& D, const DICompositeType *CTy) override;
 
   /// Add info for Wasm-global-based relocation.
   void addWasmRelocBaseGlobal(DIELoc *Loc, StringRef GlobalName,
                               uint64_t GlobalIndex);
 
-  /// Create context DIE for abstract subprogram.
-  /// \returns The context DIE and the compile unit where abstract
-  ///          DIE should be constructed.
-  std::pair<DIE *, DwarfCompileUnit *>
-  getOrCreateAbstractSubprogramContextDIE(const DISubprogram *SP);
-
-  /// Create new DIE for abstract subprogram.
-  DIE &createAbstractSubprogramDIE(const DISubprogram *SP, DIE *ContextDIE,
-                                   DwarfCompileUnit *ContextCU);
-
 public:
   DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A,
                    DwarfDebug *DW, DwarfFile *DWU,
@@ -233,8 +216,7 @@ class DwarfCompileUnit final : public DwarfUnit {
   /// DW_AT_low_pc, DW_AT_high_pc and DW_AT_LLVM_stmt_sequence attributes.
   /// If there are global variables in this scope then create and insert DIEs
   /// for these variables.
-  DIE &updateSubprogramScopeDIE(const DISubprogram *SP, const Function &F,
-                                MCSymbol *LineTableSym);
+  DIE &updateSubprogramScopeDIE(const DISubprogram *SP, MCSymbol 
*LineTableSym);
 
   void constructScopeDIE(LexicalScope *Scope, DIE &ParentScopeDIE);
 
@@ -277,18 +259,12 @@ class DwarfCompileUnit final : public DwarfUnit {
   /// This instance of 'getOrCreateContextDIE()' can handle DILocalScope.
   DIE *getOrCreateContextDIE(const DIScope *Ty) override;
 
-  DIE *getOrCreateSubprogramDIE(const DISubprogram *SP, const Function *F,
-                                bool Minimal = false) override;
-
   /// Construct a DIE for this subprogram scope.
-  DIE &constructSubprogramScopeDIE(const DISubprogram *Sub, const Function &F,
-                                   LexicalScope *Scope, MCSymbol 
*LineTableSym);
+  DIE &constructSubprogramScopeDIE(const DISubprogram *Sub, LexicalScope 
*Scope,
+                                   MCSymbol *LineTableSym);
 
   DIE *createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE);
 
-  /// Create an abstract subprogram DIE, that should later be populated
-  /// by \ref constructAbstractSubprogramScopeDIE.
-  DIE &getOrCreateAbstractSubprogramDIE(const DISubprogram *SP);
   void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
 
   /// Whether to use the GNU analog for a DWARF5 tag, attribute, or location
@@ -305,15 +281,14 @@ class DwarfCompileUnit final : public DwarfUnit {
   dwarf::LocationAtom getDwarf5OrGNULocationAtom(dwarf::LocationAtom Loc) 
const;
 
   /// Construct a call site entry DIE describing a call within \p Scope to a
-  /// callee described by \p CalleeSP and \p CalleeF.
+  /// callee described by \p CalleeSP.
   /// \p IsTail specifies whether the call is a tail call.
   /// \p PCAddr points to the PC value after the call instruction.
   /// \p CallAddr points to the PC value at the call instruction (or is null).
   /// \p CallReg is a register location for an indirect call. For direct calls
   /// the \p CallReg is set to 0.
   DIE &constructCallSiteEntryDIE(DIE &ScopeDIE, const DISubprogram *CalleeSP,
-                                 const Function *CalleeF, bool IsTail,
-                                 const MCSymbol *PCAddr,
+                                 bool IsTail, const MCSymbol *PCAddr,
                                  const MCSymbol *CallAddr, unsigned CallReg,
                                  DIType *AllocSiteTy);
   /// Construct call site parameter DIEs for the \p CallSiteDIE. The \p Params

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp 
b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 8efc6f124a55d..05d3d18aa9557 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -997,9 +997,8 @@ void DwarfDebug::constructCallSiteEntryDIEs(const 
DISubprogram &SP,
                                                        ->getName(CallReg)))
                         << (IsTail ? " [IsTail]" : "") << "\n");
 
-      DIE &CallSiteDIE =
-          CU.constructCallSiteEntryDIE(ScopeDIE, CalleeSP, CalleeDecl, IsTail,
-                                       PCAddr, CallAddr, CallReg, AllocSiteTy);
+      DIE &CallSiteDIE = CU.constructCallSiteEntryDIE(
+          ScopeDIE, CalleeSP, IsTail, PCAddr, CallAddr, CallReg, AllocSiteTy);
 
       // Optionally emit call-site-param debug info.
       if (emitDebugEntryValues()) {
@@ -2708,8 +2707,7 @@ void DwarfDebug::skippedNonDebugFunction() {
 
 // Gather and emit post-function debug information.
 void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
-  const Function &F = MF->getFunction();
-  const DISubprogram *SP = F.getSubprogram();
+  const DISubprogram *SP = MF->getFunction().getSubprogram();
 
   assert(CurFn == MF &&
       "endFunction should be called with the same function as beginFunction");
@@ -2778,12 +2776,11 @@ void DwarfDebug::endFunctionImpl(const MachineFunction 
*MF) {
 
   ProcessedSPNodes.insert(SP);
   DIE &ScopeDIE =
-      TheCU.constructSubprogramScopeDIE(SP, F, FnScope, 
FunctionLineTableLabel);
+      TheCU.constructSubprogramScopeDIE(SP, FnScope, FunctionLineTableLabel);
   if (auto *SkelCU = TheCU.getSkeleton())
     if (!LScopes.getAbstractScopesList().empty() &&
         TheCU.getCUNode()->getSplitDebugInlining())
-      SkelCU->constructSubprogramScopeDIE(SP, F, FnScope,
-                                          FunctionLineTableLabel);
+      SkelCU->constructSubprogramScopeDIE(SP, FnScope, FunctionLineTableLabel);
 
   FunctionLineTableLabel = nullptr;
 

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h 
b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
index ef1524d875c84..0fc2b91ddfa91 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
@@ -11,7 +11,6 @@
 
 #include "DwarfStringPool.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/DIE.h"
@@ -28,7 +27,6 @@ class DbgVariable;
 class DbgLabel;
 class DINode;
 class DILocalScope;
-class DISubprogram;
 class DwarfCompileUnit;
 class DwarfUnit;
 class LexicalScope;
@@ -96,9 +94,6 @@ class DwarfFile {
   // Collection of abstract subprogram DIEs.
   DenseMap<const DILocalScope *, DIE *> AbstractLocalScopeDIEs;
   DenseMap<const DINode *, std::unique_ptr<DbgEntity>> AbstractEntities;
-  /// Keeps track of abstract subprograms to populate them only once.
-  // FIXME: merge creation and population of abstract scopes.
-  SmallPtrSet<const DISubprogram *, 8> FinalizedAbstractSubprograms;
 
   /// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
   /// be shared across CUs, that is why we keep the map here instead
@@ -179,10 +174,6 @@ class DwarfFile {
     return AbstractEntities;
   }
 
-  auto &getFinalizedAbstractSubprograms() {
-    return FinalizedAbstractSubprograms;
-  }
-
   void insertDIE(const MDNode *TypeMD, DIE *Die) {
     DITypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
   }

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp 
b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 62fb5eb011cf2..d76fd0c010209 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -573,7 +573,7 @@ DIE *DwarfUnit::getOrCreateContextDIE(const DIScope 
*Context) {
   if (auto *NS = dyn_cast<DINamespace>(Context))
     return getOrCreateNameSpace(NS);
   if (auto *SP = dyn_cast<DISubprogram>(Context))
-    return getOrCreateSubprogramDIE(SP, nullptr);
+    return getOrCreateSubprogramDIE(SP);
   if (auto *M = dyn_cast<DIModule>(Context))
     return getOrCreateModule(M);
   return getDIE(Context);
@@ -1066,7 +1066,7 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, const 
DICompositeType *CTy) {
       if (!Element)
         continue;
       if (auto *SP = dyn_cast<DISubprogram>(Element))
-        getOrCreateSubprogramDIE(SP, nullptr);
+        getOrCreateSubprogramDIE(SP);
       else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
         if (DDTy->getTag() == dwarf::DW_TAG_friend) {
           DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
@@ -1335,21 +1335,22 @@ DIE *DwarfUnit::getOrCreateModule(const DIModule *M) {
   return &MDie;
 }
 
-DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP,
-                                         const Function *FnHint, bool Minimal) 
{
+DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal) 
{
   // Construct the context before querying for the existence of the DIE in case
   // such construction creates the DIE (as is the case for member function
   // declarations).
   DIE *ContextDIE =
-      getOrCreateSubprogramContextDIE(SP, shouldPlaceInUnitDIE(SP, Minimal));
+      Minimal ? &getUnitDie() : getOrCreateContextDIE(SP->getScope());
 
   if (DIE *SPDie = getDIE(SP))
     return SPDie;
 
   if (auto *SPDecl = SP->getDeclaration()) {
     if (!Minimal) {
+      // Add subprogram definitions to the CU die directly.
+      ContextDIE = &getUnitDie();
       // Build the decl now to ensure it precedes the definition.
-      getOrCreateSubprogramDIE(SPDecl, nullptr);
+      getOrCreateSubprogramDIE(SPDecl);
       // Check whether the DIE for SP has already been created after the call
       // above.
       // FIXME: Should the creation of definition subprogram DIE during

diff  --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h 
b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
index bb00ec3af9782..fe05766cf36e1 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
@@ -256,9 +256,7 @@ class DwarfUnit : public DIEUnit {
 
   DIE *getOrCreateNameSpace(const DINamespace *NS);
   DIE *getOrCreateModule(const DIModule *M);
-  virtual DIE *getOrCreateSubprogramDIE(const DISubprogram *SP,
-                                        const Function *FnHint,
-                                        bool Minimal = false);
+  DIE *getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal = false);
 
   void applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
                                  bool SkipSPAttributes = false);
@@ -345,18 +343,6 @@ class DwarfUnit : public DIEUnit {
   /// Emit the common part of the header for this unit.
   void emitCommonHeader(bool UseOffsets, dwarf::UnitType UT);
 
-  bool shouldPlaceInUnitDIE(const DISubprogram *SP, bool Minimal) {
-    // Add subprogram declarations to the CU die directly.
-    return Minimal || SP->getDeclaration();
-  }
-
-  DIE *getOrCreateSubprogramContextDIE(const DISubprogram *SP,
-                                       bool IgnoreScope) {
-    if (IgnoreScope)
-      return &getUnitDie();
-    return getOrCreateContextDIE(SP->getScope());
-  }
-
 private:
   /// A helper to add a wide integer constant to a DIE using a block
   /// form.

diff  --git a/llvm/lib/CodeGen/LexicalScopes.cpp 
b/llvm/lib/CodeGen/LexicalScopes.cpp
index 9fc9ac9a66d41..5916f619537a4 100644
--- a/llvm/lib/CodeGen/LexicalScopes.cpp
+++ b/llvm/lib/CodeGen/LexicalScopes.cpp
@@ -23,7 +23,6 @@
 #include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Metadata.h"
-#include "llvm/IR/Module.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
@@ -37,16 +36,8 @@ using namespace llvm;
 
 #define DEBUG_TYPE "lexicalscopes"
 
-static bool skipUnit(const DICompileUnit *CU) {
-  return CU->getEmissionKind() == DICompileUnit::NoDebug;
-}
-
-void LexicalScopes::resetModule() {
-  FunctionMap.clear();
-  resetFunction();
-}
-
-void LexicalScopes::resetFunction() {
+/// reset - Reset the instance so that it's prepared for another function.
+void LexicalScopes::reset() {
   MF = nullptr;
   CurrentFnLexicalScope = nullptr;
   LexicalScopeMap.clear();
@@ -56,19 +47,12 @@ void LexicalScopes::resetFunction() {
   DominatedBlocks.clear();
 }
 
-void LexicalScopes::initialize(const Module &M) {
-  resetModule();
-  for (const Function &F : M) {
-    DISubprogram *SP = F.getSubprogram();
-    if (SP && (!SP->getUnit() || !skipUnit(SP->getUnit())))
-      FunctionMap[SP] = &F;
-  }
-}
-
-void LexicalScopes::scanFunction(const MachineFunction &Fn) {
-  resetFunction();
+/// initialize - Scan machine function and constuct lexical scope nest.
+void LexicalScopes::initialize(const MachineFunction &Fn) {
+  reset();
   // Don't attempt any lexical scope creation for a NoDebug compile unit.
-  if (skipUnit(Fn.getFunction().getSubprogram()->getUnit()))
+  if (Fn.getFunction().getSubprogram()->getUnit()->getEmissionKind() ==
+      DICompileUnit::NoDebug)
     return;
   MF = &Fn;
   SmallVector<InsnRange, 4> MIRanges;
@@ -159,7 +143,8 @@ LexicalScope *LexicalScopes::getOrCreateLexicalScope(const 
DILocalScope *Scope,
                                                      const DILocation *IA) {
   if (IA) {
     // Skip scopes inlined from a NoDebug compile unit.
-    if (skipUnit(Scope->getSubprogram()->getUnit()))
+    if (Scope->getSubprogram()->getUnit()->getEmissionKind() ==
+        DICompileUnit::NoDebug)
       return getOrCreateLexicalScope(IA);
     // Create an abstract scope for inlined function.
     getOrCreateAbstractScope(Scope);

diff  --git a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp 
b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
index 0037bdd270ff3..a8143bd8f4273 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@@ -3721,7 +3721,7 @@ bool InstrRefBasedLDV::ExtendRanges(MachineFunction &MF,
   TFI = MF.getSubtarget().getFrameLowering();
   TFI->getCalleeSaves(MF, CalleeSavedRegs);
   MFI = &MF.getFrameInfo();
-  LS.scanFunction(MF);
+  LS.initialize(MF);
 
   const auto &STI = MF.getSubtarget();
   AdjustsStackInCalls = MFI->adjustsStack() &&

diff  --git a/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp 
b/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
index b9ea03f949ef8..82e0c28f2f26c 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
@@ -2231,7 +2231,7 @@ bool VarLocBasedLDV::ExtendRanges(MachineFunction &MF,
   TFI->getCalleeSaves(MF, CalleeSavedRegs);
   this->ShouldEmitDebugEntryValues = ShouldEmitDebugEntryValues;
 
-  LS.scanFunction(MF);
+  LS.initialize(MF);
 
   bool Changed = false;
   bool OLChanged = false;

diff  --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp 
b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index 001ba5250f77e..84e9f030694bf 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp
@@ -1263,7 +1263,7 @@ void UserValue::computeIntervals(MachineRegisterInfo &MRI,
 
 void LiveDebugVariables::LDVImpl::computeIntervals() {
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
 
   for (const auto &UV : userValues) {
     UV->computeIntervals(MF->getRegInfo(), *TRI, *LIS, LS);

diff  --git a/llvm/test/CodeGen/X86/dbg-distringtype-uint.ll 
b/llvm/test/CodeGen/X86/dbg-distringtype-uint.ll
index 7542c1b8db327..638a65d4a8b0b 100644
--- a/llvm/test/CodeGen/X86/dbg-distringtype-uint.ll
+++ b/llvm/test/CodeGen/X86/dbg-distringtype-uint.ll
@@ -1,13 +1,5 @@
 ; RUN: llc -mtriple=x86_64 -filetype=obj < %s | llvm-dwarfdump -debug-info - | 
FileCheck %s
-
-; Ensure that static local variable elemnt is placed in abstract subprogram 
DIE.
-; CHECK:                   DW_TAG_subprogram
-; CHECK-NOT:               DW_TAG
-; CHECK:                     DW_AT_inline  (DW_INL_inlined)
-; CHECK-EMPTY:
-; CHECK-NEXT:                DW_TAG_variable
-; CHECK-NEXT:                  DW_AT_name  ("elemnt")
-
+;
 ; CHECK: [[SYM:[a-z0-9]+]]:  DW_TAG_formal_parameter
 ; CHECK:                     DW_AT_name        ("esym")
 ; CHECK:                     DW_AT_type        ([[TYPE:[a-z0-9]+]] 
"CHARACTER_1")

diff  --git a/llvm/test/DebugInfo/AArch64/debug-types.ll 
b/llvm/test/DebugInfo/AArch64/debug-types.ll
deleted file mode 100644
index 0d0fd33f49fdf..0000000000000
--- a/llvm/test/DebugInfo/AArch64/debug-types.ll
+++ /dev/null
@@ -1,59 +0,0 @@
-; Check that composite type DIEs go to debug_types section.
-
-; RUN: llc -generate-type-units -filetype=obj %s -o - | llvm-dwarfdump 
-debug-info -debug-types - | FileCheck %s
-
-; CHECK: .debug_info contents:
-; CHECK: DW_TAG_compile_unit
-; CHECK: DW_TAG_class_type
-; CHECK: DW_AT_signature ([[SIG_A:0x[0-9a-f]+]])
-; CHECK: DW_TAG_subprogram
-; CHECK: NULL
-; CHECK: DW_TAG_subprogram
-; CHECK: "_ZN1A6AppendEv"
-; CHECK: DW_TAG_class_type
-; CHECK: DW_AT_signature ([[SIG_LAMBDA:0x[0-9a-f]+]])
-; CHECK: DW_TAG_variable
-; CHECK: NULL
-; CHECK: DW_TAG_subprogram
-; CHECK: DW_TAG_inlined_subroutine
-; CHECK: NULL
-; CHECK: NULL
-
-; CHECK:      .debug_types contents:
-; CHECK:      Type Unit: {{.*}} type_signature = [[SIG_A]]
-; CHECK:      DW_TAG_class_type
-; CHECK-NOT:    DW_TAG
-; CHECK:        DW_AT_name ("A")
-; CHECK:      Type Unit: {{.*}} type_signature = [[SIG_LAMBDA]]
-; CHECK:      DW_TAG_class_type
-; CHECK:      DW_TAG_class_type
-; CHECK-NOT:    DW_TAG
-; CHECK:        DW_AT_decl_line (7)
-
-target triple = "aarch64-unknown-linux-gnu"
-
-define void @_Z1f1A() !dbg !4 {
-entry:
-  ret void, !dbg !8
-}
-
-!llvm.dbg.cu = !{!0}
-!llvm.module.flags = !{!3}
-
-!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, 
emissionKind: FullDebug, globals: !2)
-!1 = !DIFile(filename: "<stdin>", directory: "")
-!2 = !{}
-!3 = !{i32 2, !"Debug Info Version", i32 3}
-!4 = distinct !DISubprogram(name: "f", linkageName: "_Z1f1A", scope: !5, file: 
!5, line: 14, type: !6, scopeLine: 14, flags: DIFlagPrototyped, spFlags: 
DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
-!5 = !DIFile(filename: "repro.ii", directory: "")
-!6 = distinct !DISubroutineType(types: !7)
-!7 = !{null}
-!8 = !DILocation(line: 8, column: 12, scope: !9, inlinedAt: !16)
-!9 = distinct !DISubprogram(name: "Append", linkageName: "_ZN1A6AppendEv", 
scope: !10, file: !5, line: 6, type: !11, scopeLine: 6, flags: 
DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, 
declaration: !12, retainedNodes: !13)
-!10 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !5, 
line: 3, size: 32, flags: DIFlagTypePassByValue, elements: !2, identifier: 
"_ZTS1A")
-!11 = distinct !DISubroutineType(types: !7)
-!12 = !DISubprogram(name: "Append", linkageName: "_ZN1A6AppendEv", scope: !10, 
file: !5, line: 6, type: !11, scopeLine: 6, flags: DIFlagPublic | 
DIFlagPrototyped, spFlags: DISPFlagOptimized)
-!13 = !{!14}
-!14 = !DILocalVariable(name: "raw_append", scope: !9, file: !5, line: 7, type: 
!15)
-!15 = distinct !DICompositeType(tag: DW_TAG_class_type, scope: !9, file: !5, 
line: 7, size: 8, flags: DIFlagTypePassByValue | DIFlagNonTrivial, elements: 
!2, identifier: "_ZTSZN1A6AppendEvEUlvE_")
-!16 = distinct !DILocation(line: 14, column: 15, scope: !4)

diff  --git a/llvm/test/DebugInfo/AArch64/populate-abstract-sp-once.ll 
b/llvm/test/DebugInfo/AArch64/populate-abstract-sp-once.ll
deleted file mode 100644
index 20cc98a1bfdcd..0000000000000
--- a/llvm/test/DebugInfo/AArch64/populate-abstract-sp-once.ll
+++ /dev/null
@@ -1,67 +0,0 @@
-; Check that abstract DIEs for inlined subprograms and lexical scopes
-; are populated only once.
-
-; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump - -o - | FileCheck 
--implicit-check-not=DW_TAG_lexical_scope --implicit-check-not 
DW_TAG_subprogram %s
-
-; CHECK:  DW_TAG_compile_unit
-; CHECK:    DW_TAG_namespace
-; CHECK:      DW_TAG_subprogram
-; CHECK:        DW_AT_declaration (true)
-; CHECK:      DW_TAG_subprogram
-; CHECK:        DW_AT_declaration (true)
-; CHECK:      DW_TAG_subprogram
-; CHECK:        DW_AT_declaration (true)
-; CHECK:      NULL
-
-; CHECK:  [[ABSTRACT_SP:0x[0-9a-f]+]]: DW_TAG_subprogram
-; CHECK:    DW_AT_inline (DW_INL_inlined)
-
-; CHECK:    DW_TAG_lexical_block
-; CHECK:      DW_TAG_imported_module
-; CHECK:      NULL
-
-; CHECK:    NULL
-
-; CHECK:  DW_TAG_subprogram
-; CHECK:    DW_TAG_inlined_subroutine
-; CHECK:      DW_AT_abstract_origin ([[ABSTRACT_SP]]
-; CHECK:    NULL
-; CHECK:  DW_TAG_subprogram
-; CHECK:    DW_TAG_inlined_subroutine
-; CHECK:      DW_AT_abstract_origin ([[ABSTRACT_SP]]
-; CHECK:    NULL
-
-target triple = "aarch64-unknown-linux-gnu"
-
-define void 
@_ZN12_GLOBAL__N_117MapRegionCounters14TraverseIfStmtEPN5clang6IfStmtE() !dbg 
!4 {
-entry:
-  ret void, !dbg !8
-}
-
-define void @_ZN12_GLOBAL__N_117MapRegionCounters9VisitStmtEPN5clang4StmtE() 
!dbg !15 {
-entry:
-  ret void, !dbg !17
-}
-
-!llvm.dbg.cu = !{!0}
-!llvm.module.flags = !{!3}
-
-!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, 
isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, 
retainedTypes: !2, globals: !2, imports: !2)
-!1 = !DIFile(filename: "CodeGenPGO.cpp", directory: "/")
-!2 = !{}
-!3 = !{i32 2, !"Debug Info Version", i32 3}
-!4 = distinct !DISubprogram(name: "TraverseIfStmt", linkageName: 
"_ZN12_GLOBAL__N_117MapRegionCounters14TraverseIfStmtEPN5clang6IfStmtE", scope: 
!5, file: !1, line: 364, type: !6, scopeLine: 364, flags: DIFlagPrototyped | 
DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | 
DISPFlagOptimized, unit: !0, declaration: !7, retainedNodes: !2, 
keyInstructions: true)
-!5 = !DINamespace(name: "llvm", scope: null)
-!6 = distinct !DISubroutineType(types: !2)
-!7 = !DISubprogram(name: "TraverseIfStmt", linkageName: 
"_ZN12_GLOBAL__N_117MapRegionCounters14TraverseIfStmtEPN5clang6IfStmtE", scope: 
!5, file: !1, line: 364, type: !6, scopeLine: 364, flags: DIFlagPrototyped, 
spFlags: DISPFlagLocalToUnit | DISPFlagOptimized)
-!8 = !DILocation(line: 982, column: 39, scope: !9, inlinedAt: !14, atomGroup: 
6, atomRank: 2)
-!9 = distinct !DISubprogram(name: "combine", linkageName: 
"_ZN12_GLOBAL__N_17PGOHash7combineENS0_8HashTypeE", scope: !5, file: !1, line: 
966, type: !6, scopeLine: 966, flags: DIFlagPrototyped | 
DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | 
DISPFlagOptimized, unit: !0, declaration: !10, retainedNodes: !11, 
keyInstructions: true)
-!10 = !DISubprogram(name: "combine", linkageName: 
"_ZN12_GLOBAL__N_17PGOHash7combineENS0_8HashTypeE", scope: !5, file: !1, line: 
140, type: !6, scopeLine: 140, flags: DIFlagPublic | DIFlagPrototyped, spFlags: 
DISPFlagLocalToUnit | DISPFlagOptimized)
-!11 = !{!12}
-!12 = !DIImportedEntity(tag: DW_TAG_imported_module, scope: !13, entity: !5, 
file: !1, line: 973)
-!13 = distinct !DILexicalBlock(scope: !9, file: !1, line: 972, column: 7)
-!14 = distinct !DILocation(line: 393, column: 10, scope: !4)
-!15 = distinct !DISubprogram(name: "VisitStmt", linkageName: 
"_ZN12_GLOBAL__N_117MapRegionCounters9VisitStmtEPN5clang4StmtE", scope: !5, 
file: !1, line: 355, type: !6, scopeLine: 355, flags: DIFlagPrototyped | 
DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | 
DISPFlagOptimized, unit: !0, declaration: !16, retainedNodes: !2, 
keyInstructions: true)
-!16 = !DISubprogram(name: "VisitStmt", linkageName: 
"_ZN12_GLOBAL__N_117MapRegionCounters9VisitStmtEPN5clang4StmtE", scope: !5, 
file: !1, line: 355, type: !6, scopeLine: 355, flags: DIFlagPrototyped, 
spFlags: DISPFlagLocalToUnit | DISPFlagOptimized)
-!17 = !DILocation(line: 982, column: 13, scope: !9, inlinedAt: !18)
-!18 = distinct !DILocation(line: 360, column: 12, scope: !15)

diff  --git a/llvm/test/DebugInfo/Generic/inlined-static-var.ll 
b/llvm/test/DebugInfo/Generic/inlined-static-var.ll
deleted file mode 100644
index 1d24646896d80..0000000000000
--- a/llvm/test/DebugInfo/Generic/inlined-static-var.ll
+++ /dev/null
@@ -1,93 +0,0 @@
-; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-info - | 
FileCheck --implicit-check-not "{{DW_TAG|NULL}}" %s
-
-; inline __attribute__((always_inline))
-; int removed() { static int A; return A++; }
-;
-; __attribute__((always_inline))
-; int not_removed() { static int B; return B++; }
-;
-; int foo() { return removed() + not_removed(); }
-
-; Ensure that global variables belong to the correct subprograms even if those
-; subprograms are inlined.
-
-; CHECK: DW_TAG_compile_unit
-; CHECK:   DW_TAG_subprogram
-; CHECK:     DW_AT_abstract_origin {{.*}} "_Z11not_removedv"
-; TODO: This variable should be emitted in abstract subprogram DIE.
-; CHECK:     DW_TAG_variable
-; CHECK:       DW_AT_name     ("B")
-; CHECK:     NULL
-; CHECK:   DW_TAG_base_type
-; CHECK:   DW_TAG_subprogram
-; CHECK:     DW_AT_name       ("removed")
-; CHECK:     DW_TAG_variable
-; CHECK:       DW_AT_name     ("A")
-; CHECK:     NULL
-; CHECK:   DW_TAG_subprogram
-; CHECK:     DW_AT_name       ("not_removed")
-; CHECK:   DW_TAG_subprogram
-; CHECK:     DW_AT_name       ("foo")
-; CHECK:     DW_TAG_inlined_subroutine
-; CHECK:     DW_TAG_inlined_subroutine
-; CHECK:     NULL
-; CHECK:   NULL
-
-@_ZZ11not_removedvE1A = internal global i32 0, align 4, !dbg !0
-@_ZZ7removedvE1A = linkonce_odr dso_local global i32 0, align 4, !dbg !10
-
-define dso_local i32 @_Z11not_removedv() !dbg !2 {
-  %1 = load i32, i32* @_ZZ11not_removedvE1A, align 4, !dbg !24
-  %2 = add nsw i32 %1, 1, !dbg !24
-  store i32 %2, i32* @_ZZ11not_removedvE1A, align 4, !dbg !24
-  ret i32 %1, !dbg !25
-}
-
-define dso_local i32 @_Z3foov() !dbg !26 {
-  %1 = load i32, i32* @_ZZ7removedvE1A, align 4, !dbg !27
-  %2 = add nsw i32 %1, 1, !dbg !27
-  store i32 %2, i32* @_ZZ7removedvE1A, align 4, !dbg !27
-  %3 = load i32, i32* @_ZZ11not_removedvE1A, align 4, !dbg !29
-  %4 = add nsw i32 %3, 1, !dbg !29
-  store i32 %4, i32* @_ZZ11not_removedvE1A, align 4, !dbg !29
-  %5 = add nsw i32 %1, %3, !dbg !31
-  ret i32 %5, !dbg !32
-}
-
-!llvm.dbg.cu = !{!7}
-!llvm.module.flags = !{!14, !15, !16, !17, !18, !19, !20, !21, !22}
-!llvm.ident = !{!23}
-
-!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
-!1 = distinct !DIGlobalVariable(name: "B", scope: !2, file: !3, line: 5, type: 
!6, isLocal: true, isDefinition: true)
-!2 = distinct !DISubprogram(name: "not_removed", linkageName: 
"_Z11not_removedv", scope: !3, file: !3, line: 5, type: !4, scopeLine: 5, 
flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: 
!13)
-!3 = !DIFile(filename: "example.cpp", directory: "")
-!4 = !DISubroutineType(types: !5)
-!5 = !{!6}
-!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
-!7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !8, 
producer: "clang version 14.0.0", isOptimized: false, runtimeVersion: 0, 
emissionKind: FullDebug, globals: !9, splitDebugInlining: false, nameTableKind: 
None)
-!8 = !DIFile(filename: "example.cpp", directory: "")
-!9 = !{!0, !10}
-!10 = !DIGlobalVariableExpression(var: !11, expr: !DIExpression())
-!11 = distinct !DIGlobalVariable(name: "A", scope: !12, file: !3, line: 2, 
type: !6, isLocal: false, isDefinition: true)
-!12 = distinct !DISubprogram(name: "removed", linkageName: "_Z7removedv", 
scope: !3, file: !3, line: 2, type: !4, scopeLine: 2, flags: DIFlagPrototyped, 
spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !13)
-!13 = !{}
-!14 = !{i32 7, !"Dwarf Version", i32 4}
-!15 = !{i32 2, !"Debug Info Version", i32 3}
-!16 = !{i32 1, !"wchar_size", i32 4}
-!17 = !{i32 1, !"branch-target-enforcement", i32 0}
-!18 = !{i32 1, !"sign-return-address", i32 0}
-!19 = !{i32 1, !"sign-return-address-all", i32 0}
-!20 = !{i32 1, !"sign-return-address-with-bkey", i32 0}
-!21 = !{i32 7, !"uwtable", i32 1}
-!22 = !{i32 7, !"frame-pointer", i32 1}
-!23 = !{!"clang version 14.0.0"}
-!24 = !DILocation(line: 5, column: 43, scope: !2)
-!25 = !DILocation(line: 5, column: 35, scope: !2)
-!26 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !3, 
file: !3, line: 7, type: !4, scopeLine: 7, flags: DIFlagPrototyped, spFlags: 
DISPFlagDefinition, unit: !7, retainedNodes: !13)
-!27 = !DILocation(line: 2, column: 39, scope: !12, inlinedAt: !28)
-!28 = distinct !DILocation(line: 7, column: 20, scope: !26)
-!29 = !DILocation(line: 5, column: 43, scope: !2, inlinedAt: !30)
-!30 = distinct !DILocation(line: 7, column: 32, scope: !26)
-!31 = !DILocation(line: 7, column: 30, scope: !26)
-!32 = !DILocation(line: 7, column: 13, scope: !26)

diff  --git a/llvm/unittests/CodeGen/InstrRefLDVTest.cpp 
b/llvm/unittests/CodeGen/InstrRefLDVTest.cpp
index 3a625b299a96f..53bc0246c126e 100644
--- a/llvm/unittests/CodeGen/InstrRefLDVTest.cpp
+++ b/llvm/unittests/CodeGen/InstrRefLDVTest.cpp
@@ -159,7 +159,7 @@ class InstrRefLDVTest : public testing::Test {
     // Setup things like the artifical block map, and BlockNo <=> RPO Order
     // mappings.
     LDV->initialSetup(*MF);
-    LDV->LS.scanFunction(*MF);
+    LDV->LS.initialize(*MF);
     addMTracker(MF);
     return &*LDV;
   }

diff  --git a/llvm/unittests/CodeGen/LexicalScopesTest.cpp 
b/llvm/unittests/CodeGen/LexicalScopesTest.cpp
index 34bd37a4afdc2..563d496d1e600 100644
--- a/llvm/unittests/CodeGen/LexicalScopesTest.cpp
+++ b/llvm/unittests/CodeGen/LexicalScopesTest.cpp
@@ -44,7 +44,6 @@ class LexicalScopesTest : public testing::Test {
   std::unique_ptr<MachineFunction> MF;
   DICompileUnit *OurCU;
   DIFile *OurFile;
-  DISubroutineType *OurSubT;
   DISubprogram *OurFunc;
   DILexicalBlock *OurBlock, *AnotherBlock;
   DISubprogram *ToInlineFunc;
@@ -104,7 +103,7 @@ class LexicalScopesTest : public testing::Test {
     OurFile = DIB.createFile("xyzzy.c", "/cave");
     OurCU =
         DIB.createCompileUnit(dwarf::DW_LANG_C99, OurFile, "nou", false, "", 
0);
-    OurSubT = DIB.createSubroutineType(DIB.getOrCreateTypeArray({}));
+    auto OurSubT = DIB.createSubroutineType(DIB.getOrCreateTypeArray({}));
     OurFunc =
         DIB.createFunction(OurCU, "bees", "", OurFile, 1, OurSubT, 1,
                            DINode::FlagZero, DISubprogram::SPFlagDefinition);
@@ -137,10 +136,10 @@ TEST_F(LexicalScopesTest, FlatLayout) {
 
   LexicalScopes LS;
   EXPECT_TRUE(LS.empty());
-  LS.resetFunction();
+  LS.reset();
   EXPECT_EQ(LS.getCurrentFunctionScope(), nullptr);
 
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   EXPECT_FALSE(LS.empty());
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   EXPECT_EQ(FuncScope->getParent(), nullptr);
@@ -183,7 +182,7 @@ TEST_F(LexicalScopesTest, BlockScopes) {
   BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   EXPECT_EQ(FuncScope->getDesc(), OurFunc);
   auto &Children = FuncScope->getChildren();
@@ -218,7 +217,7 @@ TEST_F(LexicalScopesTest, InlinedScopes) {
   BuildMI(*MBB4, MBB4->end(), InlinedLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   auto &Children = FuncScope->getChildren();
   ASSERT_EQ(Children.size(), 1u);
@@ -253,7 +252,7 @@ TEST_F(LexicalScopesTest, FuncWithEmptyGap) {
   BuildMI(*MBB4, MBB4->end(), OutermostLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
 
   // A gap in a range that contains no other location, is not actually a
@@ -274,7 +273,7 @@ TEST_F(LexicalScopesTest, FuncWithRealGap) {
   MachineInstr *LastI = BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
   ASSERT_NE(BlockScope, nullptr);
 
@@ -307,7 +306,7 @@ TEST_F(LexicalScopesTest, NotNested) {
   MachineInstr *FourthI = BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
   LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
@@ -345,7 +344,7 @@ TEST_F(LexicalScopesTest, TestDominates) {
   BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
   LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
@@ -387,7 +386,7 @@ TEST_F(LexicalScopesTest, TestGetBlocks) {
   BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
   LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
@@ -444,7 +443,7 @@ TEST_F(LexicalScopesTest, TestMetaInst) {
   BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
 
   LexicalScopes LS;
-  LS.scanFunction(*MF);
+  LS.initialize(*MF);
   LexicalScope *FuncScope = LS.getCurrentFunctionScope();
   LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
   ASSERT_NE(FuncScope, nullptr);
@@ -460,24 +459,4 @@ TEST_F(LexicalScopesTest, TestMetaInst) {
   EXPECT_TRUE(LS.dominates(InBlockLoc.get(), MBB4));
 }
 
-// Test function map creation.
-TEST_F(LexicalScopesTest, TestFunctionScan) {
-  auto MF2 = createMachineFunction(Ctx, Mod, "Test2");
-  DIBuilder DIB(Mod, false, OurCU);
-  DISubprogram *Func2 =
-      DIB.createFunction(OurCU, "Func2", "", OurFile, 1, OurSubT, 1,
-                         DINode::FlagZero, DISubprogram::SPFlagDefinition);
-  DISubprogram *UnattachedFunc =
-      DIB.createFunction(OurCU, "UnattachedFunc", "", OurFile, 1, OurSubT, 1,
-                         DINode::FlagZero, DISubprogram::SPFlagDefinition);
-  MF2->getFunction().setSubprogram(Func2);
-  DIB.finalize();
-
-  LexicalScopes LS;
-  LS.initialize(Mod);
-  ASSERT_EQ(LS.getFunction(OurFunc), &MF->getFunction());
-  ASSERT_EQ(LS.getFunction(Func2), &MF2->getFunction());
-  ASSERT_EQ(LS.getFunction(UnattachedFunc), nullptr);
-}
-
 } // anonymous namespace

diff  --git a/llvm/unittests/CodeGen/MFCommon.inc 
b/llvm/unittests/CodeGen/MFCommon.inc
index a86a68cb4adf1..cb4a2410df08b 100644
--- a/llvm/unittests/CodeGen/MFCommon.inc
+++ b/llvm/unittests/CodeGen/MFCommon.inc
@@ -132,10 +132,10 @@ BogusTargetMachine *createTargetMachine() {
   return &BogusTM;
 }
 
-std::unique_ptr<MachineFunction>
-createMachineFunction(LLVMContext &Ctx, Module &M, const Twine &Name = "Test") 
{
+std::unique_ptr<MachineFunction> createMachineFunction(LLVMContext &Ctx,
+                                                       Module &M) {
   auto Type = FunctionType::get(Type::getVoidTy(Ctx), false);
-  auto F = Function::Create(Type, GlobalValue::ExternalLinkage, Name, &M);
+  auto F = Function::Create(Type, GlobalValue::ExternalLinkage, "Test", &M);
 
   auto TM = createTargetMachine();
   unsigned FunctionNum = 42;
@@ -145,3 +145,4 @@ createMachineFunction(LLVMContext &Ctx, Module &M, const 
Twine &Name = "Test") {
   return std::make_unique<MachineFunction>(*F, *TM, STI, MMI.getContext(),
                                            FunctionNum);
 }
+


        
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