[llvm] r203270 - [C++11] DwarfDebug: Use range-based for loops.

David Blaikie dblaikie at gmail.com
Fri Mar 7 11:27:30 PST 2014


On Fri, Mar 7, 2014 at 11:09 AM, Benjamin Kramer
<benny.kra at googlemail.com> wrote:
> Author: d0k
> Date: Fri Mar  7 13:09:39 2014
> New Revision: 203270
>
> URL: http://llvm.org/viewvc/llvm-project?rev=203270&view=rev
> Log:
> [C++11] DwarfDebug: Use range-based for loops.
>
> It has a lot of them with complex types. C++11 really shines here.

Thanks a bunch!

>
> Modified:
>     llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
>
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp?rev=203270&r1=203269&r2=203270&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp Fri Mar  7 13:09:39 2014
> @@ -236,9 +236,8 @@ static MCSymbol *emitSectionSym(AsmPrint
>  }
>
>  DwarfFile::~DwarfFile() {
> -  for (SmallVectorImpl<DwarfUnit *>::iterator I = CUs.begin(), E = CUs.end();
> -       I != E; ++I)
> -    delete *I;
> +  for (DwarfUnit *DU : CUs)
> +    delete DU;
>  }
>
>  MCSymbol *DwarfFile::getStringPoolSym() {
> @@ -464,11 +463,8 @@ void DwarfDebug::addScopeRangeList(Dwarf
>                    DwarfDebugRangeSectionSym);
>
>    RangeSpanList List(RangeSym);
> -  for (SmallVectorImpl<InsnRange>::const_iterator RI = Range.begin(),
> -                                                  RE = Range.end();
> -       RI != RE; ++RI) {
> -    RangeSpan Span(getLabelBeforeInsn(RI->first),
> -                   getLabelAfterInsn(RI->second));
> +  for (const InsnRange &R : Range) {
> +    RangeSpan Span(getLabelBeforeInsn(R.first), getLabelAfterInsn(R.second));
>      List.addRange(std::move(Span));
>    }
>
> @@ -573,8 +569,8 @@ DIE *DwarfDebug::createScopeChildrenDIE(
>
>    // Collect arguments for current function.
>    if (LScopes.isCurrentFunctionScope(Scope)) {
> -    for (unsigned i = 0, N = CurrentFnArguments.size(); i < N; ++i)
> -      if (DbgVariable *ArgDV = CurrentFnArguments[i])
> +    for (DbgVariable *ArgDV : CurrentFnArguments)
> +      if (ArgDV)
>          if (DIE *Arg =
>                  TheCU->constructVariableDIE(*ArgDV, Scope->isAbstractScope())) {
>            Children.push_back(Arg);
> @@ -593,18 +589,15 @@ DIE *DwarfDebug::createScopeChildrenDIE(
>    }
>
>    // Collect lexical scope children first.
> -  const SmallVectorImpl<DbgVariable *> &Variables =
> -      ScopeVariables.lookup(Scope);
> -  for (unsigned i = 0, N = Variables.size(); i < N; ++i)
> -    if (DIE *Variable = TheCU->constructVariableDIE(*Variables[i],
> +  for (DbgVariable *DV : ScopeVariables.lookup(Scope))
> +    if (DIE *Variable = TheCU->constructVariableDIE(*DV,
>                                                      Scope->isAbstractScope())) {
>        Children.push_back(Variable);
> -      if (Variables[i]->isObjectPointer())
> +      if (DV->isObjectPointer())
>          ObjectPointer = Variable;
>      }
> -  const SmallVectorImpl<LexicalScope *> &Scopes = Scope->getChildren();
> -  for (unsigned j = 0, M = Scopes.size(); j < M; ++j)
> -    if (DIE *Nested = constructScopeDIE(TheCU, Scopes[j]))
> +  for (LexicalScope *LS : Scope->getChildren())
> +    if (DIE *Nested = constructScopeDIE(TheCU, LS))
>        Children.push_back(Nested);
>    return ObjectPointer;
>  }
> @@ -673,10 +666,8 @@ DIE *DwarfDebug::constructScopeDIE(Dwarf
>      ObjectPointer = createScopeChildrenDIE(TheCU, Scope, Children);
>
>    // Add children
> -  for (SmallVectorImpl<DIE *>::iterator I = Children.begin(),
> -                                        E = Children.end();
> -       I != E; ++I)
> -    ScopeDIE->addChild(*I);
> +  for (DIE *I : Children)
> +    ScopeDIE->addChild(I);
>
>    if (DS.isSubprogram() && ObjectPointer != NULL)
>      TheCU->addDIEEntry(ScopeDIE, dwarf::DW_AT_object_pointer, ObjectPointer);
> @@ -879,8 +870,8 @@ void DwarfDebug::beginModule() {
>    // Emit initial sections so we can reference labels later.
>    emitSectionLabels();
>
> -  for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
> -    DICompileUnit CUNode(CU_Nodes->getOperand(i));
> +  for (MDNode *N : CU_Nodes->operands()) {
> +    DICompileUnit CUNode(N);
>      DwarfCompileUnit *CU = constructDwarfCompileUnit(CUNode);
>      DIArray ImportedEntities = CUNode.getImportedEntities();
>      for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
> @@ -917,16 +908,11 @@ void DwarfDebug::beginModule() {
>  // Attach DW_AT_inline attribute with inlined subprogram DIEs.
>  void DwarfDebug::computeInlinedDIEs() {
>    // Attach DW_AT_inline attribute with inlined subprogram DIEs.
> -  for (SmallPtrSet<DIE *, 4>::iterator AI = InlinedSubprogramDIEs.begin(),
> -                                       AE = InlinedSubprogramDIEs.end();
> -       AI != AE; ++AI) {
> -    DIE *ISP = *AI;
> +  for (DIE *ISP : InlinedSubprogramDIEs)
>      FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
> -  }
> -  for (DenseMap<const MDNode *, DIE *>::iterator AI = AbstractSPDies.begin(),
> -                                                 AE = AbstractSPDies.end();
> -       AI != AE; ++AI) {
> -    DIE *ISP = AI->second;
> +
> +  for (const auto &AI : AbstractSPDies) {
> +    DIE *ISP = AI.second;
>      if (InlinedSubprogramDIEs.count(ISP))
>        continue;
>      FirstCU->addUInt(ISP, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
> @@ -938,8 +924,8 @@ void DwarfDebug::collectDeadVariables()
>    const Module *M = MMI->getModule();
>
>    if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
> -    for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
> -      DICompileUnit TheCU(CU_Nodes->getOperand(i));
> +    for (MDNode *N : CU_Nodes->operands()) {
> +      DICompileUnit TheCU(N);
>        DIArray Subprograms = TheCU.getSubprograms();
>        for (unsigned i = 0, e = Subprograms.getNumElements(); i != e; ++i) {
>          DISubprogram SP(Subprograms.getElement(i));
> @@ -983,10 +969,7 @@ void DwarfDebug::finalizeModuleInfo() {
>
>    // Handle anything that needs to be done on a per-unit basis after
>    // all other generation.
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
> -                                                    E = getUnits().end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> +  for (DwarfUnit *TheU : getUnits()) {
>      // Emit DW_AT_containing_type attribute to connect types with their
>      // vtable holding type.
>      TheU->constructContainingTypeDIEs();
> @@ -1041,8 +1024,7 @@ void DwarfDebug::finalizeModuleInfo() {
>
>  void DwarfDebug::endSections() {
>    // Filter labels by section.
> -  for (size_t n = 0; n < ArangeLabels.size(); n++) {
> -    const SymbolCU &SCU = ArangeLabels[n];
> +  for (const SymbolCU &SCU : ArangeLabels) {
>      if (SCU.Sym->isInSection()) {
>        // Make a note of this symbol and it's section.
>        const MCSection *Section = &SCU.Sym->getSection();
> @@ -1058,9 +1040,8 @@ void DwarfDebug::endSections() {
>
>    // Build a list of sections used.
>    std::vector<const MCSection *> Sections;
> -  for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
> -       it++) {
> -    const MCSection *Section = it->first;
> +  for (const auto &it : SectionMap) {
> +    const MCSection *Section = it.first;
>      Sections.push_back(Section);
>    }
>
> @@ -1069,7 +1050,7 @@ void DwarfDebug::endSections() {
>    std::sort(Sections.begin(), Sections.end(), SectionSort);
>
>    // Add terminating symbols for each section.
> -  for (unsigned ID = 0; ID < Sections.size(); ID++) {
> +  for (unsigned ID = 0, E = Sections.size(); ID != E; ID++) {
>      const MCSection *Section = Sections[ID];
>      MCSymbol *Sym = NULL;
>
> @@ -1204,16 +1185,13 @@ bool DwarfDebug::addCurrentFnArgument(Db
>  // Collect variable information from side table maintained by MMI.
>  void DwarfDebug::collectVariableInfoFromMMITable(
>      SmallPtrSet<const MDNode *, 16> &Processed) {
> -  MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
> -  for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
> -                                                         VE = VMap.end();
> -       VI != VE; ++VI) {
> -    const MDNode *Var = VI->first;
> +  for (const auto &VI : MMI->getVariableDbgInfo()) {
> +    const MDNode *Var = VI.first;
>      if (!Var)
>        continue;
>      Processed.insert(Var);
>      DIVariable DV(Var);
> -    const std::pair<unsigned, DebugLoc> &VP = VI->second;
> +    const std::pair<unsigned, DebugLoc> &VP = VI.second;
>
>      LexicalScope *Scope = LScopes.findLexicalScope(VP.second);
>
> @@ -1276,11 +1254,7 @@ DwarfDebug::collectVariableInfo(SmallPtr
>    // Grab the variable info that was squirreled away in the MMI side-table.
>    collectVariableInfoFromMMITable(Processed);
>
> -  for (SmallVectorImpl<const MDNode *>::const_iterator
> -           UVI = UserVariables.begin(),
> -           UVE = UserVariables.end();
> -       UVI != UVE; ++UVI) {
> -    const MDNode *Var = *UVI;
> +  for (const MDNode *Var : UserVariables) {
>      if (Processed.count(Var))
>        continue;
>
> @@ -1472,25 +1446,16 @@ void DwarfDebug::identifyScopeMarkers()
>
>      const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
>      if (!Children.empty())
> -      for (SmallVectorImpl<LexicalScope *>::const_iterator
> -               SI = Children.begin(),
> -               SE = Children.end();
> -           SI != SE; ++SI)
> -        WorkList.push_back(*SI);
> +      WorkList.append(Children.begin(), Children.end());
>
>      if (S->isAbstractScope())
>        continue;
>
> -    const SmallVectorImpl<InsnRange> &Ranges = S->getRanges();
> -    if (Ranges.empty())
> -      continue;
> -    for (SmallVectorImpl<InsnRange>::const_iterator RI = Ranges.begin(),
> -                                                    RE = Ranges.end();
> -         RI != RE; ++RI) {
> -      assert(RI->first && "InsnRange does not have first instruction!");
> -      assert(RI->second && "InsnRange does not have second instruction!");
> -      requestLabelBeforeInsn(RI->first);
> -      requestLabelAfterInsn(RI->second);
> +    for (const InsnRange &R : S->getRanges()) {
> +      assert(R.first && "InsnRange does not have first instruction!");
> +      assert(R.second && "InsnRange does not have second instruction!");
> +      requestLabelBeforeInsn(R.first);
> +      requestLabelAfterInsn(R.second);
>      }
>    }
>  }
> @@ -1615,12 +1580,10 @@ void DwarfDebug::beginFunction(const Mac
>            PrologEndLoc = MI->getDebugLoc();
>
>          // Check if the instruction clobbers any registers with debug vars.
> -        for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
> -                                              MOE = MI->operands_end();
> -             MOI != MOE; ++MOI) {
> -          if (!MOI->isReg() || !MOI->isDef() || !MOI->getReg())
> +        for (const MachineOperand &MO : MI->operands()) {
> +          if (!MO.isReg() || !MO.isDef() || !MO.getReg())
>              continue;
> -          for (MCRegAliasIterator AI(MOI->getReg(), TRI, true); AI.isValid();
> +          for (MCRegAliasIterator AI(MO.getReg(), TRI, true); AI.isValid();
>                 ++AI) {
>              unsigned Reg = *AI;
>              const MDNode *Var = LiveUserVar[Reg];
> @@ -1653,9 +1616,8 @@ void DwarfDebug::beginFunction(const Mac
>      }
>    }
>
> -  for (DbgValueHistoryMap::iterator I = DbgValues.begin(), E = DbgValues.end();
> -       I != E; ++I) {
> -    SmallVectorImpl<const MachineInstr *> &History = I->second;
> +  for (auto &I : DbgValues) {
> +    SmallVectorImpl<const MachineInstr *> &History = I.second;
>      if (History.empty())
>        continue;
>
> @@ -1674,8 +1636,7 @@ void DwarfDebug::beginFunction(const Mac
>        }
>      }
>      // Request labels for the full history.
> -    for (unsigned i = 0, e = History.size(); i != e; ++i) {
> -      const MachineInstr *MI = History[i];
> +    for (const MachineInstr *MI : History) {
>        if (MI->isDebugValue())
>          requestLabelBeforeInsn(MI);
>        else
> @@ -1762,9 +1723,7 @@ void DwarfDebug::endFunction(const Machi
>    assert(TheCU && "Unable to find compile unit!");
>
>    // Construct abstract scopes.
> -  ArrayRef<LexicalScope *> AList = LScopes.getAbstractScopesList();
> -  for (unsigned i = 0, e = AList.size(); i != e; ++i) {
> -    LexicalScope *AScope = AList[i];
> +  for (LexicalScope *AScope : LScopes.getAbstractScopesList()) {
>      DISubprogram SP(AScope->getScopeNode());
>      if (SP.isSubprogram()) {
>        // Collect info for variables that were optimized out.
> @@ -1796,10 +1755,8 @@ void DwarfDebug::endFunction(const Machi
>    TheCU->addRange(std::move(Span));
>
>    // Clear debug info
> -  for (ScopeVariablesMap::iterator I = ScopeVariables.begin(),
> -                                   E = ScopeVariables.end();
> -       I != E; ++I)
> -    DeleteContainerPointers(I->second);
> +  for (auto &I : ScopeVariables)
> +    DeleteContainerPointers(I.second);
>    ScopeVariables.clear();
>    DeleteContainerPointers(CurrentFnArguments);
>    UserVariables.clear();
> @@ -1860,9 +1817,6 @@ void DwarfDebug::recordSourceLine(unsign
>  // Compute the size and offset of a DIE. The offset is relative to start of the
>  // CU. It returns the offset after laying out the DIE.
>  unsigned DwarfFile::computeSizeAndOffset(DIE *Die, unsigned Offset) {
> -  // Get the children.
> -  const std::vector<DIE *> &Children = Die->getChildren();
> -
>    // Record the abbreviation.
>    assignAbbrevNumber(Die->getAbbrev());
>
> @@ -1883,12 +1837,15 @@ unsigned DwarfFile::computeSizeAndOffset
>      // Size attribute value.
>      Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
>
> +  // Get the children.
> +  const std::vector<DIE *> &Children = Die->getChildren();
> +
>    // Size the DIE children if any.
>    if (!Children.empty()) {
>      assert(Abbrev.hasChildren() && "Children flag not set");
>
> -    for (unsigned j = 0, M = Children.size(); j < M; ++j)
> -      Offset = computeSizeAndOffset(Children[j], Offset);
> +    for (DIE *Child : Children)
> +      Offset = computeSizeAndOffset(Child, Offset);
>
>      // End of children marker.
>      Offset += sizeof(int8_t);
> @@ -1905,18 +1862,16 @@ void DwarfFile::computeSizeAndOffsets()
>
>    // Iterate over each compile unit and set the size and offsets for each
>    // DIE within each compile unit. All offsets are CU relative.
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = CUs.begin(),
> -                                                    E = CUs.end();
> -       I != E; ++I) {
> -    (*I)->setDebugInfoOffset(SecOffset);
> +  for (DwarfUnit *TheU : CUs) {
> +    TheU->setDebugInfoOffset(SecOffset);
>
>      // CU-relative offset is reset to 0 here.
>      unsigned Offset = sizeof(int32_t) +      // Length of Unit Info
> -                      (*I)->getHeaderSize(); // Unit-specific headers
> +                      TheU->getHeaderSize(); // Unit-specific headers
>
>      // EndOffset here is CU-relative, after laying out
>      // all of the CU DIE.
> -    unsigned EndOffset = computeSizeAndOffset((*I)->getUnitDie(), Offset);
> +    unsigned EndOffset = computeSizeAndOffset(TheU->getUnitDie(), Offset);
>      SecOffset += EndOffset;
>    }
>  }
> @@ -2004,8 +1959,8 @@ void DwarfDebug::emitDIE(DIE *Die) {
>    if (Abbrev.hasChildren()) {
>      const std::vector<DIE *> &Children = Die->getChildren();
>
> -    for (unsigned j = 0, M = Children.size(); j < M; ++j)
> -      emitDIE(Children[j]);
> +    for (DIE *Child : Children)
> +      emitDIE(Child);
>
>      Asm->OutStreamer.AddComment("End Of Children Mark");
>      Asm->EmitInt8(0);
> @@ -2016,9 +1971,7 @@ void DwarfDebug::emitDIE(DIE *Die) {
>  // the abbreviations going into ASection.
>  void DwarfFile::emitUnits(DwarfDebug *DD, const MCSection *ASection,
>                            const MCSymbol *ASectionSym) {
> -  for (SmallVectorImpl<DwarfUnit *>::iterator I = CUs.begin(), E = CUs.end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> +  for (DwarfUnit *TheU : CUs) {
>      DIE *Die = TheU->getUnitDie();
>      const MCSection *USection = TheU->getSection();
>      Asm->OutStreamer.SwitchSection(USection);
> @@ -2059,10 +2012,7 @@ void DwarfFile::emitAbbrevs(const MCSect
>      Asm->OutStreamer.SwitchSection(Section);
>
>      // For each abbrevation.
> -    for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
> -      // Get abbreviation data
> -      const DIEAbbrev *Abbrev = Abbreviations[i];
> -
> +    for (const DIEAbbrev *Abbrev : Abbreviations) {
>        // Emit the abbrevations code (base 1 index.)
>        Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
>
> @@ -2103,21 +2053,11 @@ void DwarfDebug::emitEndOfLineMatrix(uns
>  void DwarfDebug::emitAccelNames() {
>    DwarfAccelTable AT(
>        DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
> -                                                    E = getUnits().end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> -    const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelNames();
> -    for (StringMap<std::vector<const DIE *> >::const_iterator
> -             GI = Names.begin(),
> -             GE = Names.end();
> -         GI != GE; ++GI) {
> -      StringRef Name = GI->getKey();
> -      const std::vector<const DIE *> &Entities = GI->second;
> -      for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
> -                                                    DE = Entities.end();
> -           DI != DE; ++DI)
> -        AT.AddName(Name, *DI);
> +  for (DwarfUnit *TheU : getUnits()) {
> +    for (const auto &GI : TheU->getAccelNames()) {
> +      StringRef Name = GI.getKey();
> +      for (const DIE *D : GI.second)
> +        AT.AddName(Name, D);
>      }
>    }
>
> @@ -2136,21 +2076,11 @@ void DwarfDebug::emitAccelNames() {
>  void DwarfDebug::emitAccelObjC() {
>    DwarfAccelTable AT(
>        DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
> -                                                    E = getUnits().end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> -    const StringMap<std::vector<const DIE *> > &Names = TheU->getAccelObjC();
> -    for (StringMap<std::vector<const DIE *> >::const_iterator
> -             GI = Names.begin(),
> -             GE = Names.end();
> -         GI != GE; ++GI) {
> -      StringRef Name = GI->getKey();
> -      const std::vector<const DIE *> &Entities = GI->second;
> -      for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
> -                                                    DE = Entities.end();
> -           DI != DE; ++DI)
> -        AT.AddName(Name, *DI);
> +  for (DwarfUnit *TheU : getUnits()) {
> +    for (const auto &GI : TheU->getAccelObjC()) {
> +      StringRef Name = GI.getKey();
> +      for (const DIE *D : GI.second)
> +        AT.AddName(Name, D);
>      }
>    }
>
> @@ -2168,22 +2098,11 @@ void DwarfDebug::emitAccelObjC() {
>  void DwarfDebug::emitAccelNamespaces() {
>    DwarfAccelTable AT(
>        DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset, dwarf::DW_FORM_data4));
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
> -                                                    E = getUnits().end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> -    const StringMap<std::vector<const DIE *> > &Names =
> -        TheU->getAccelNamespace();
> -    for (StringMap<std::vector<const DIE *> >::const_iterator
> -             GI = Names.begin(),
> -             GE = Names.end();
> -         GI != GE; ++GI) {
> -      StringRef Name = GI->getKey();
> -      const std::vector<const DIE *> &Entities = GI->second;
> -      for (std::vector<const DIE *>::const_iterator DI = Entities.begin(),
> -                                                    DE = Entities.end();
> -           DI != DE; ++DI)
> -        AT.AddName(Name, *DI);
> +  for (DwarfUnit *TheU : getUnits()) {
> +    for (const auto &GI : TheU->getAccelNamespace()) {
> +      StringRef Name = GI.getKey();
> +      for (const DIE *D : GI.second)
> +        AT.AddName(Name, D);
>      }
>    }
>
> @@ -2207,25 +2126,11 @@ void DwarfDebug::emitAccelTypes() {
>    Atoms.push_back(
>        DwarfAccelTable::Atom(dwarf::DW_ATOM_type_flags, dwarf::DW_FORM_data1));
>    DwarfAccelTable AT(Atoms);
> -  for (SmallVectorImpl<DwarfUnit *>::const_iterator I = getUnits().begin(),
> -                                                    E = getUnits().end();
> -       I != E; ++I) {
> -    DwarfUnit *TheU = *I;
> -    const StringMap<std::vector<std::pair<const DIE *, unsigned> > > &Names =
> -        TheU->getAccelTypes();
> -    for (StringMap<
> -             std::vector<std::pair<const DIE *, unsigned> > >::const_iterator
> -             GI = Names.begin(),
> -             GE = Names.end();
> -         GI != GE; ++GI) {
> -      StringRef Name = GI->getKey();
> -      const std::vector<std::pair<const DIE *, unsigned> > &Entities =
> -          GI->second;
> -      for (std::vector<std::pair<const DIE *, unsigned> >::const_iterator
> -               DI = Entities.begin(),
> -               DE = Entities.end();
> -           DI != DE; ++DI)
> -        AT.AddName(Name, DI->first, DI->second);
> +  for (DwarfUnit *TheU : getUnits()) {
> +    for (const auto &GI : TheU->getAccelTypes()) {
> +      StringRef Name = GI.getKey();
> +      for (const auto &DI : GI.second)
> +        AT.AddName(Name, DI.first, DI.second);
>      }
>    }
>
> @@ -2334,12 +2239,9 @@ void DwarfDebug::emitDebugPubNames(bool
>      Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
>
>      // Emit the pubnames for this compilation unit.
> -    const StringMap<const DIE *> &Globals = getUnits()[ID]->getGlobalNames();
> -    for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
> -                                                GE = Globals.end();
> -         GI != GE; ++GI) {
> -      const char *Name = GI->getKeyData();
> -      const DIE *Entity = GI->second;
> +    for (const auto &GI : getUnits()[ID]->getGlobalNames()) {
> +      const char *Name = GI.getKeyData();
> +      const DIE *Entity = GI.second;
>
>        Asm->OutStreamer.AddComment("DIE offset");
>        Asm->EmitInt32(Entity->getOffset());
> @@ -2353,7 +2255,7 @@ void DwarfDebug::emitDebugPubNames(bool
>        }
>
>        Asm->OutStreamer.AddComment("External Name");
> -      Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
> +      Asm->OutStreamer.EmitBytes(StringRef(Name, GI.getKeyLength() + 1));
>      }
>
>      Asm->OutStreamer.AddComment("End Mark");
> @@ -2398,12 +2300,9 @@ void DwarfDebug::emitDebugPubTypes(bool
>      Asm->EmitLabelDifference(TheU->getLabelEnd(), TheU->getLabelBegin(), 4);
>
>      // Emit the pubtypes.
> -    const StringMap<const DIE *> &Globals = getUnits()[ID]->getGlobalTypes();
> -    for (StringMap<const DIE *>::const_iterator GI = Globals.begin(),
> -                                                GE = Globals.end();
> -         GI != GE; ++GI) {
> -      const char *Name = GI->getKeyData();
> -      const DIE *Entity = GI->second;
> +    for (const auto &GI : getUnits()[ID]->getGlobalTypes()) {
> +      const char *Name = GI.getKeyData();
> +      const DIE *Entity = GI.second;
>
>        Asm->OutStreamer.AddComment("DIE offset");
>        Asm->EmitInt32(Entity->getOffset());
> @@ -2419,7 +2318,7 @@ void DwarfDebug::emitDebugPubTypes(bool
>        Asm->OutStreamer.AddComment("External Name");
>
>        // Emit the name with a terminating null byte.
> -      Asm->OutStreamer.EmitBytes(StringRef(Name, GI->getKeyLength() + 1));
> +      Asm->OutStreamer.EmitBytes(StringRef(Name, GI.getKeyLength() + 1));
>      }
>
>      Asm->OutStreamer.AddComment("End Mark");
> @@ -2441,26 +2340,20 @@ void DwarfFile::emitStrings(const MCSect
>
>    // Get all of the string pool entries and put them in an array by their ID so
>    // we can sort them.
> -  SmallVector<
> -      std::pair<unsigned, StringMapEntry<std::pair<MCSymbol *, unsigned> > *>,
> -      64> Entries;
> -
> -  for (StringMap<std::pair<MCSymbol *, unsigned> >::iterator
> -           I = StringPool.begin(),
> -           E = StringPool.end();
> -       I != E; ++I)
> -    Entries.push_back(std::make_pair(I->second.second, &*I));
> +  SmallVector<std::pair<unsigned, const StrPool::value_type *>, 64 > Entries;
> +
> +  for (const auto &I : StringPool)
> +    Entries.push_back(std::make_pair(I.second.second, &I));
>
>    array_pod_sort(Entries.begin(), Entries.end());
>
> -  for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
> +  for (const auto &Entry : Entries) {
>      // Emit a label for reference from debug information entries.
> -    Asm->OutStreamer.EmitLabel(Entries[i].second->getValue().first);
> +    Asm->OutStreamer.EmitLabel(Entry.second->getValue().first);
>
>      // Emit the string itself with a terminating null byte.
> -    Asm->OutStreamer.EmitBytes(
> -        StringRef(Entries[i].second->getKeyData(),
> -                  Entries[i].second->getKeyLength() + 1));
> +    Asm->OutStreamer.EmitBytes(StringRef(Entry.second->getKeyData(),
> +                                         Entry.second->getKeyLength() + 1));
>    }
>
>    // If we've got an offset section go ahead and emit that now as well.
> @@ -2468,9 +2361,9 @@ void DwarfFile::emitStrings(const MCSect
>      Asm->OutStreamer.SwitchSection(OffsetSection);
>      unsigned offset = 0;
>      unsigned size = 4; // FIXME: DWARF64 is 8.
> -    for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
> +    for (const auto &Entry : Entries) {
>        Asm->OutStreamer.EmitIntValue(offset, size);
> -      offset += Entries[i].second->getKeyLength() + 1;
> +      offset += Entry.second->getKeyLength() + 1;
>      }
>    }
>  }
> @@ -2487,16 +2380,14 @@ void DwarfFile::emitAddresses(const MCSe
>    // Order the address pool entries by ID
>    SmallVector<const MCExpr *, 64> Entries(AddressPool.size());
>
> -  for (AddrPool::iterator I = AddressPool.begin(), E = AddressPool.end();
> -       I != E; ++I)
> -    Entries[I->second.Number] =
> -        I->second.TLS
> -            ? Asm->getObjFileLowering().getDebugThreadLocalSymbol(I->first)
> -            : MCSymbolRefExpr::Create(I->first, Asm->OutContext);
> -
> -  for (unsigned i = 0, e = Entries.size(); i != e; ++i)
> -    Asm->OutStreamer.EmitValue(Entries[i],
> -                               Asm->getDataLayout().getPointerSize());
> +  for (const auto &I : AddressPool)
> +    Entries[I.second.Number] =
> +        I.second.TLS
> +            ? Asm->getObjFileLowering().getDebugThreadLocalSymbol(I.first)
> +            : MCSymbolRefExpr::Create(I.first, Asm->OutContext);
> +
> +  for (const MCExpr *Entry : Entries)
> +    Asm->OutStreamer.EmitValue(Entry, Asm->getDataLayout().getPointerSize());
>  }
>
>  // Emit visible names into a debug str section.
> @@ -2646,9 +2537,8 @@ void DwarfDebug::emitDebugARanges() {
>
>    // Build a list of sections used.
>    std::vector<const MCSection *> Sections;
> -  for (SectionMapType::iterator it = SectionMap.begin(); it != SectionMap.end();
> -       it++) {
> -    const MCSection *Section = it->first;
> +  for (const auto &it : SectionMap) {
> +    const MCSection *Section = it.first;
>      Sections.push_back(Section);
>    }
>
> @@ -2657,8 +2547,7 @@ void DwarfDebug::emitDebugARanges() {
>    std::sort(Sections.begin(), Sections.end(), SectionSort);
>
>    // Build a set of address spans, sorted by CU.
> -  for (size_t SecIdx = 0; SecIdx < Sections.size(); SecIdx++) {
> -    const MCSection *Section = Sections[SecIdx];
> +  for (const MCSection *Section : Sections) {
>      SmallVector<SymbolCU, 8> &List = SectionMap[Section];
>      if (List.size() < 2)
>        continue;
> @@ -2670,9 +2559,7 @@ void DwarfDebug::emitDebugARanges() {
>      // If we have no section (e.g. common), just write out
>      // individual spans for each symbol.
>      if (Section == NULL) {
> -      for (size_t n = 0; n < List.size(); n++) {
> -        const SymbolCU &Cur = List[n];
> -
> +      for (const SymbolCU &Cur : List) {
>          ArangeSpan Span;
>          Span.Start = Cur.Sym;
>          Span.End = NULL;
> @@ -2682,7 +2569,7 @@ void DwarfDebug::emitDebugARanges() {
>      } else {
>        // Build spans between each label.
>        const MCSymbol *StartSym = List[0].Sym;
> -      for (size_t n = 1; n < List.size(); n++) {
> +      for (size_t n = 1, e = List.size(); n < e; n++) {
>          const SymbolCU &Prev = List[n - 1];
>          const SymbolCU &Cur = List[n];
>
> @@ -2702,8 +2589,8 @@ void DwarfDebug::emitDebugARanges() {
>
>    // Build a list of CUs used.
>    std::vector<DwarfCompileUnit *> CUs;
> -  for (SpansType::iterator it = Spans.begin(); it != Spans.end(); it++) {
> -    DwarfCompileUnit *CU = it->first;
> +  for (const auto &it : Spans) {
> +    DwarfCompileUnit *CU = it.first;
>      CUs.push_back(CU);
>    }
>
> @@ -2711,8 +2598,7 @@ void DwarfDebug::emitDebugARanges() {
>    std::sort(CUs.begin(), CUs.end(), CUSort);
>
>    // Emit an arange table for each CU we used.
> -  for (size_t CUIdx = 0; CUIdx < CUs.size(); CUIdx++) {
> -    DwarfCompileUnit *CU = CUs[CUIdx];
> +  for (DwarfCompileUnit *CU : CUs) {
>      std::vector<ArangeSpan> &List = Spans[CU];
>
>      // Emit size of content not including length itself.
> @@ -2745,8 +2631,7 @@ void DwarfDebug::emitDebugARanges() {
>
>      Asm->OutStreamer.EmitFill(Padding, 0xff);
>
> -    for (unsigned n = 0; n < List.size(); n++) {
> -      const ArangeSpan &Span = List[n];
> +    for (const ArangeSpan &Span : List) {
>        Asm->EmitLabelReference(Span.Start, PtrSize);
>
>        // Calculate the size as being from the span start to it's end.
> @@ -2779,30 +2664,18 @@ void DwarfDebug::emitDebugRanges() {
>    unsigned char Size = Asm->getDataLayout().getPointerSize();
>
>    // Grab the specific ranges for the compile units in the module.
> -  for (MapVector<const MDNode *, DwarfCompileUnit *>::iterator
> -           I = CUMap.begin(),
> -           E = CUMap.end();
> -       I != E; ++I) {
> -    DwarfCompileUnit *TheCU = I->second;
> +  for (const auto &I : CUMap) {
> +    DwarfCompileUnit *TheCU = I.second;
>
>      // Emit a symbol so we can find the beginning of our ranges.
>      Asm->OutStreamer.EmitLabel(TheCU->getLabelRange());
>
>      // Iterate over the misc ranges for the compile units in the module.
> -    const SmallVectorImpl<RangeSpanList> &RangeLists = TheCU->getRangeLists();
> -    for (SmallVectorImpl<RangeSpanList>::const_iterator I = RangeLists.begin(),
> -                                                        E = RangeLists.end();
> -         I != E; ++I) {
> -      const RangeSpanList &List = *I;
> -
> +    for (const RangeSpanList &List : TheCU->getRangeLists()) {
>        // Emit our symbol so we can find the beginning of the range.
>        Asm->OutStreamer.EmitLabel(List.getSym());
>
> -      for (SmallVectorImpl<RangeSpan>::const_iterator
> -               RI = List.getRanges().begin(),
> -               RE = List.getRanges().end();
> -           RI != RE; ++RI) {
> -        const RangeSpan &Range = *RI;
> +      for (const RangeSpan &Range : List.getRanges()) {
>          const MCSymbol *Begin = Range.getStart();
>          const MCSymbol *End = Range.getEnd();
>          assert(Begin && "Range without a begin symbol?");
> @@ -2820,9 +2693,7 @@ void DwarfDebug::emitDebugRanges() {
>      if (useCURanges() && TheCU->getRanges().size()) {
>        Asm->OutStreamer.EmitLabel(
>            Asm->GetTempSymbol("cu_ranges", TheCU->getUniqueID()));
> -      const SmallVectorImpl<RangeSpan> &Ranges = TheCU->getRanges();
> -      for (uint32_t i = 0, e = Ranges.size(); i != e; ++i) {
> -        RangeSpan Range = Ranges[i];
> +      for (const RangeSpan &Range : TheCU->getRanges()) {
>          const MCSymbol *Begin = Range.getStart();
>          const MCSymbol *End = Range.getEnd();
>          assert(Begin && "Range without a begin symbol?");
>
>
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