LCOV - code coverage report
Current view: top level - lib/CodeGen/AsmPrinter - DwarfDebug.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 40 40 100.0 %
Date: 2017-09-14 15:23:50 Functions: 7 7 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework --------*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains support for writing dwarf debug info into asm files.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
      15             : #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
      16             : 
      17             : #include "AddressPool.h"
      18             : #include "DbgValueHistoryCalculator.h"
      19             : #include "DebugHandlerBase.h"
      20             : #include "DebugLocStream.h"
      21             : #include "DwarfAccelTable.h"
      22             : #include "DwarfFile.h"
      23             : #include "llvm/ADT/ArrayRef.h"
      24             : #include "llvm/ADT/DenseMap.h"
      25             : #include "llvm/ADT/DenseSet.h"
      26             : #include "llvm/ADT/MapVector.h"
      27             : #include "llvm/ADT/STLExtras.h"
      28             : #include "llvm/ADT/SetVector.h"
      29             : #include "llvm/ADT/SmallPtrSet.h"
      30             : #include "llvm/ADT/SmallVector.h"
      31             : #include "llvm/ADT/StringMap.h"
      32             : #include "llvm/ADT/StringRef.h"
      33             : #include "llvm/BinaryFormat/Dwarf.h"
      34             : #include "llvm/CodeGen/MachineInstr.h"
      35             : #include "llvm/IR/DebugInfoMetadata.h"
      36             : #include "llvm/IR/DebugLoc.h"
      37             : #include "llvm/IR/Metadata.h"
      38             : #include "llvm/MC/MCDwarf.h"
      39             : #include "llvm/Support/Allocator.h"
      40             : #include "llvm/Target/TargetOptions.h"
      41             : #include <cassert>
      42             : #include <cstdint>
      43             : #include <limits>
      44             : #include <memory>
      45             : #include <utility>
      46             : #include <vector>
      47             : 
      48             : namespace llvm {
      49             : 
      50             : class AsmPrinter;
      51             : class ByteStreamer;
      52             : class DebugLocEntry;
      53             : class DIE;
      54             : class DwarfCompileUnit;
      55             : class DwarfTypeUnit;
      56             : class DwarfUnit;
      57             : class LexicalScope;
      58             : class MachineFunction;
      59             : class MCSection;
      60             : class MCSymbol;
      61             : class MDNode;
      62             : class Module;
      63             : 
      64             : //===----------------------------------------------------------------------===//
      65             : /// This class is used to track local variable information.
      66             : ///
      67             : /// Variables can be created from allocas, in which case they're generated from
      68             : /// the MMI table.  Such variables can have multiple expressions and frame
      69             : /// indices.
      70             : ///
      71             : /// Variables can be created from \c DBG_VALUE instructions.  Those whose
      72             : /// location changes over time use \a DebugLocListIndex, while those with a
      73             : /// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
      74             : ///
      75             : /// Variables that have been optimized out use none of these fields.
      76       32678 : class DbgVariable {
      77             :   const DILocalVariable *Var;                /// Variable Descriptor.
      78             :   const DILocation *IA;                      /// Inlined at location.
      79             :   DIE *TheDIE = nullptr;                     /// Variable DIE.
      80             :   unsigned DebugLocListIndex = ~0u;          /// Offset in DebugLocs.
      81             :   const MachineInstr *MInsn = nullptr;       /// DBG_VALUE instruction.
      82             : 
      83             :   struct FrameIndexExpr {
      84             :     int FI;
      85             :     const DIExpression *Expr;
      86             :   };
      87             :   mutable SmallVector<FrameIndexExpr, 1>
      88             :       FrameIndexExprs; /// Frame index + expression.
      89             : 
      90             : public:
      91             :   /// Construct a DbgVariable.
      92             :   ///
      93             :   /// Creates a variable without any DW_AT_location.  Call \a initializeMMI()
      94             :   /// for MMI entries, or \a initializeDbgValue() for DBG_VALUE instructions.
      95             :   DbgVariable(const DILocalVariable *V, const DILocation *IA)
      96       32678 :       : Var(V), IA(IA) {}
      97             : 
      98             :   /// Initialize from the MMI table.
      99             :   void initializeMMI(const DIExpression *E, int FI) {
     100             :     assert(FrameIndexExprs.empty() && "Already initialized?");
     101             :     assert(!MInsn && "Already initialized?");
     102             : 
     103             :     assert((!E || E->isValid()) && "Expected valid expression");
     104             :     assert(FI != std::numeric_limits<int>::max() && "Expected valid index");
     105             : 
     106         447 :     FrameIndexExprs.push_back({FI, E});
     107             :   }
     108             : 
     109             :   /// Initialize from a DBG_VALUE instruction.
     110        9732 :   void initializeDbgValue(const MachineInstr *DbgValue) {
     111             :     assert(FrameIndexExprs.empty() && "Already initialized?");
     112             :     assert(!MInsn && "Already initialized?");
     113             : 
     114             :     assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
     115             :     assert(IA == DbgValue->getDebugLoc()->getInlinedAt() && "Wrong inlined-at");
     116             : 
     117        9732 :     MInsn = DbgValue;
     118        9732 :     if (auto *E = DbgValue->getDebugExpression())
     119        9732 :       if (E->getNumElements())
     120        1077 :         FrameIndexExprs.push_back({0, E});
     121        9732 :   }
     122             : 
     123             :   // Accessors.
     124             :   const DILocalVariable *getVariable() const { return Var; }
     125             :   const DILocation *getInlinedAt() const { return IA; }
     126             : 
     127             :   const DIExpression *getSingleExpression() const {
     128             :     assert(MInsn && FrameIndexExprs.size() <= 1);
     129        1630 :     return FrameIndexExprs.size() ? FrameIndexExprs[0].Expr : nullptr;
     130             :   }
     131             : 
     132       16334 :   void setDIE(DIE &D) { TheDIE = &D; }
     133             :   DIE *getDIE() const { return TheDIE; }
     134        8760 :   void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
     135             :   unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
     136       16138 :   StringRef getName() const { return Var->getName(); }
     137             :   const MachineInstr *getMInsn() const { return MInsn; }
     138             :   /// Get the FI entries, sorted by fragment offset.
     139             :   ArrayRef<FrameIndexExpr> getFrameIndexExprs() const;
     140         887 :   bool hasFrameIndexExprs() const { return !FrameIndexExprs.empty(); }
     141             : 
     142           5 :   void addMMIEntry(const DbgVariable &V) {
     143             :     assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
     144             :     assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
     145             :     assert(V.Var == Var && "conflicting variable");
     146             :     assert(V.IA == IA && "conflicting inlined-at location");
     147             : 
     148             :     assert(!FrameIndexExprs.empty() && "Expected an MMI entry");
     149             :     assert(!V.FrameIndexExprs.empty() && "Expected an MMI entry");
     150             : 
     151          10 :     if (FrameIndexExprs.size()) {
     152          10 :       auto *Expr = FrameIndexExprs.back().Expr;
     153             :       // Get rid of duplicate non-fragment entries. More than one non-fragment
     154             :       // dbg.declare makes no sense so ignore all but the first.
     155          10 :       if (!Expr || !Expr->isFragment())
     156             :         return;
     157             :     }
     158           9 :     FrameIndexExprs.append(V.FrameIndexExprs.begin(), V.FrameIndexExprs.end());
     159             :     assert(llvm::all_of(FrameIndexExprs,
     160             :                         [](FrameIndexExpr &FIE) {
     161             :                           return FIE.Expr && FIE.Expr->isFragment();
     162             :                         }) &&
     163             :            "conflicting locations for variable");
     164             :   }
     165             : 
     166             :   // Translate tag to proper Dwarf tag.
     167             :   dwarf::Tag getTag() const {
     168             :     // FIXME: Why don't we just infer this tag and store it all along?
     169       32668 :     if (Var->isParameter())
     170             :       return dwarf::DW_TAG_formal_parameter;
     171             : 
     172             :     return dwarf::DW_TAG_variable;
     173             :   }
     174             : 
     175             :   /// Return true if DbgVariable is artificial.
     176        8048 :   bool isArtificial() const {
     177       16096 :     if (Var->isArtificial())
     178             :       return true;
     179       12476 :     if (getType()->isArtificial())
     180             :       return true;
     181        6230 :     return false;
     182             :   }
     183             : 
     184       16334 :   bool isObjectPointer() const {
     185       32668 :     if (Var->isObjectPointer())
     186             :       return true;
     187       25210 :     if (getType()->isObjectPointer())
     188             :       return true;
     189       12601 :     return false;
     190             :   }
     191             : 
     192             :   bool hasComplexAddress() const {
     193             :     assert(MInsn && "Expected DBG_VALUE, not MMI variable");
     194             :     assert((FrameIndexExprs.empty() ||
     195             :             (FrameIndexExprs.size() == 1 &&
     196             :              FrameIndexExprs[0].Expr->getNumElements())) &&
     197             :            "Invalid Expr for DBG_VALUE");
     198         204 :     return !FrameIndexExprs.empty();
     199             :   }
     200             : 
     201             :   bool isBlockByrefVariable() const;
     202             :   const DIType *getType() const;
     203             : 
     204             : private:
     205             :   template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
     206             :     return Ref.resolve();
     207             :   }
     208             : };
     209             : 
     210             : /// Helper used to pair up a symbol and its DWARF compile unit.
     211             : struct SymbolCU {
     212          10 :   SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
     213             : 
     214             :   const MCSymbol *Sym;
     215             :   DwarfCompileUnit *CU;
     216             : };
     217             : 
     218             : /// Collects and handles dwarf debug information.
     219      163780 : class DwarfDebug : public DebugHandlerBase {
     220             :   /// All DIEValues are allocated through this allocator.
     221             :   BumpPtrAllocator DIEValueAllocator;
     222             : 
     223             :   /// Maps MDNode with its corresponding DwarfCompileUnit.
     224             :   MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
     225             : 
     226             :   /// Maps a CU DIE with its corresponding DwarfCompileUnit.
     227             :   DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
     228             : 
     229             :   /// List of all labels used in aranges generation.
     230             :   std::vector<SymbolCU> ArangeLabels;
     231             : 
     232             :   /// Size of each symbol emitted (for those symbols that have a specific size).
     233             :   DenseMap<const MCSymbol *, uint64_t> SymSize;
     234             : 
     235             :   /// Collection of abstract variables.
     236             :   SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
     237             : 
     238             :   /// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
     239             :   /// can refer to them in spite of insertions into this list.
     240             :   DebugLocStream DebugLocs;
     241             : 
     242             :   /// This is a collection of subprogram MDNodes that are processed to
     243             :   /// create DIEs.
     244             :   SetVector<const DISubprogram *, SmallVector<const DISubprogram *, 16>,
     245             :             SmallPtrSet<const DISubprogram *, 16>>
     246             :       ProcessedSPNodes;
     247             : 
     248             :   /// If nonnull, stores the current machine function we're processing.
     249             :   const MachineFunction *CurFn = nullptr;
     250             : 
     251             :   /// If nonnull, stores the CU in which the previous subprogram was contained.
     252             :   const DwarfCompileUnit *PrevCU;
     253             : 
     254             :   /// As an optimization, there is no need to emit an entry in the directory
     255             :   /// table for the same directory as DW_AT_comp_dir.
     256             :   StringRef CompilationDir;
     257             : 
     258             :   /// Holder for the file specific debug information.
     259             :   DwarfFile InfoHolder;
     260             : 
     261             :   /// Holders for the various debug information flags that we might need to
     262             :   /// have exposed. See accessor functions below for description.
     263             : 
     264             :   /// Map from MDNodes for user-defined types to their type signatures. Also
     265             :   /// used to keep track of which types we have emitted type units for.
     266             :   DenseMap<const MDNode *, uint64_t> TypeSignatures;
     267             : 
     268             :   SmallVector<
     269             :       std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
     270             :       TypeUnitsUnderConstruction;
     271             : 
     272             :   /// Whether to use the GNU TLS opcode (instead of the standard opcode).
     273             :   bool UseGNUTLSOpcode;
     274             : 
     275             :   /// Whether to use DWARF 2 bitfields (instead of the DWARF 4 format).
     276             :   bool UseDWARF2Bitfields;
     277             : 
     278             :   /// Whether to emit all linkage names, or just abstract subprograms.
     279             :   bool UseAllLinkageNames;
     280             : 
     281             :   /// DWARF5 Experimental Options
     282             :   /// @{
     283             :   bool HasDwarfAccelTables;
     284             :   bool HasAppleExtensionAttributes;
     285             :   bool HasSplitDwarf;
     286             : 
     287             :   /// Separated Dwarf Variables
     288             :   /// In general these will all be for bits that are left in the
     289             :   /// original object file, rather than things that are meant
     290             :   /// to be in the .dwo sections.
     291             : 
     292             :   /// Holder for the skeleton information.
     293             :   DwarfFile SkeletonHolder;
     294             : 
     295             :   /// Store file names for type units under fission in a line table
     296             :   /// header that will be emitted into debug_line.dwo.
     297             :   // FIXME: replace this with a map from comp_dir to table so that we
     298             :   // can emit multiple tables during LTO each of which uses directory
     299             :   // 0, referencing the comp_dir of all the type units that use it.
     300             :   MCDwarfDwoLineTable SplitTypeUnitFileTable;
     301             :   /// @}
     302             :   
     303             :   /// True iff there are multiple CUs in this module.
     304             :   bool SingleCU;
     305             :   bool IsDarwin;
     306             : 
     307             :   AddressPool AddrPool;
     308             : 
     309             :   DwarfAccelTable AccelNames;
     310             :   DwarfAccelTable AccelObjC;
     311             :   DwarfAccelTable AccelNamespace;
     312             :   DwarfAccelTable AccelTypes;
     313             : 
     314             :   // Identify a debugger for "tuning" the debug info.
     315             :   DebuggerKind DebuggerTuning = DebuggerKind::Default;
     316             : 
     317             :   MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
     318             : 
     319             :   const SmallVectorImpl<std::unique_ptr<DwarfCompileUnit>> &getUnits() {
     320             :     return InfoHolder.getUnits();
     321             :   }
     322             : 
     323             :   using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
     324             : 
     325             :   void ensureAbstractVariableIsCreated(DwarfCompileUnit &CU, InlinedVariable Var,
     326             :                                        const MDNode *Scope);
     327             :   void ensureAbstractVariableIsCreatedIfScoped(DwarfCompileUnit &CU, InlinedVariable Var,
     328             :                                                const MDNode *Scope);
     329             : 
     330             :   DbgVariable *createConcreteVariable(DwarfCompileUnit &TheCU,
     331             :                                       LexicalScope &Scope, InlinedVariable IV);
     332             : 
     333             :   /// Construct a DIE for this abstract scope.
     334             :   void constructAbstractSubprogramScopeDIE(DwarfCompileUnit &SrcCU, LexicalScope *Scope);
     335             : 
     336             :   void finishVariableDefinitions();
     337             : 
     338             :   void finishSubprogramDefinitions();
     339             : 
     340             :   /// Finish off debug information after all functions have been
     341             :   /// processed.
     342             :   void finalizeModuleInfo();
     343             : 
     344             :   /// Emit the debug info section.
     345             :   void emitDebugInfo();
     346             : 
     347             :   /// Emit the abbreviation section.
     348             :   void emitAbbreviations();
     349             : 
     350             :   /// Emit a specified accelerator table.
     351             :   void emitAccel(DwarfAccelTable &Accel, MCSection *Section,
     352             :                  StringRef TableName);
     353             : 
     354             :   /// Emit visible names into a hashed accelerator table section.
     355             :   void emitAccelNames();
     356             : 
     357             :   /// Emit objective C classes and categories into a hashed
     358             :   /// accelerator table section.
     359             :   void emitAccelObjC();
     360             : 
     361             :   /// Emit namespace dies into a hashed accelerator table.
     362             :   void emitAccelNamespaces();
     363             : 
     364             :   /// Emit type dies into a hashed accelerator table.
     365             :   void emitAccelTypes();
     366             : 
     367             :   /// Emit visible names and types into debug pubnames and pubtypes sections.
     368             :   void emitDebugPubSections();
     369             : 
     370             :   void emitDebugPubSection(bool GnuStyle, StringRef Name,
     371             :                            DwarfCompileUnit *TheU,
     372             :                            const StringMap<const DIE *> &Globals);
     373             : 
     374             :   /// Emit null-terminated strings into a debug str section.
     375             :   void emitDebugStr();
     376             : 
     377             :   /// Emit variable locations into a debug loc section.
     378             :   void emitDebugLoc();
     379             : 
     380             :   /// Emit variable locations into a debug loc dwo section.
     381             :   void emitDebugLocDWO();
     382             : 
     383             :   /// Emit address ranges into a debug aranges section.
     384             :   void emitDebugARanges();
     385             : 
     386             :   /// Emit address ranges into a debug ranges section.
     387             :   void emitDebugRanges();
     388             : 
     389             :   /// Emit macros into a debug macinfo section.
     390             :   void emitDebugMacinfo();
     391             :   void emitMacro(DIMacro &M);
     392             :   void emitMacroFile(DIMacroFile &F, DwarfCompileUnit &U);
     393             :   void handleMacroNodes(DIMacroNodeArray Nodes, DwarfCompileUnit &U);
     394             : 
     395             :   /// DWARF 5 Experimental Split Dwarf Emitters
     396             : 
     397             :   /// Initialize common features of skeleton units.
     398             :   void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
     399             :                         std::unique_ptr<DwarfCompileUnit> NewU);
     400             : 
     401             :   /// Construct the split debug info compile unit for the debug info
     402             :   /// section.
     403             :   DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
     404             : 
     405             :   /// Emit the debug info dwo section.
     406             :   void emitDebugInfoDWO();
     407             : 
     408             :   /// Emit the debug abbrev dwo section.
     409             :   void emitDebugAbbrevDWO();
     410             : 
     411             :   /// Emit the debug line dwo section.
     412             :   void emitDebugLineDWO();
     413             : 
     414             :   /// Emit the debug str dwo section.
     415             :   void emitDebugStrDWO();
     416             : 
     417             :   /// Flags to let the linker know we have emitted new style pubnames. Only
     418             :   /// emit it here if we don't have a skeleton CU for split dwarf.
     419             :   void addGnuPubAttributes(DwarfCompileUnit &U, DIE &D) const;
     420             : 
     421             :   /// Create new DwarfCompileUnit for the given metadata node with tag
     422             :   /// DW_TAG_compile_unit.
     423             :   DwarfCompileUnit &getOrCreateDwarfCompileUnit(const DICompileUnit *DIUnit);
     424             : 
     425             :   /// Construct imported_module or imported_declaration DIE.
     426             :   void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
     427             :                                         const DIImportedEntity *N);
     428             : 
     429             :   /// Register a source line with debug info. Returns the unique
     430             :   /// label that was emitted and which provides correspondence to the
     431             :   /// source line list.
     432             :   void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
     433             :                         unsigned Flags);
     434             : 
     435             :   /// Populate LexicalScope entries with variables' info.
     436             :   void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
     437             :                            DenseSet<InlinedVariable> &ProcessedVars);
     438             : 
     439             :   /// Build the location list for all DBG_VALUEs in the
     440             :   /// function that describe the same variable.
     441             :   void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
     442             :                          const DbgValueHistoryMap::InstrRanges &Ranges);
     443             : 
     444             :   /// Collect variable information from the side table maintained by MF.
     445             :   void collectVariableInfoFromMFTable(DwarfCompileUnit &TheCU,
     446             :                                       DenseSet<InlinedVariable> &P);
     447             : 
     448             : protected:
     449             :   /// Gather pre-function debug information.
     450             :   void beginFunctionImpl(const MachineFunction *MF) override;
     451             : 
     452             :   /// Gather and emit post-function debug information.
     453             :   void endFunctionImpl(const MachineFunction *MF) override;
     454             : 
     455             :   void skippedNonDebugFunction() override;
     456             : 
     457             : public:
     458             :   //===--------------------------------------------------------------------===//
     459             :   // Main entry points.
     460             :   //
     461             :   DwarfDebug(AsmPrinter *A, Module *M);
     462             : 
     463             :   ~DwarfDebug() override;
     464             : 
     465             :   /// Emit all Dwarf sections that should come prior to the
     466             :   /// content.
     467             :   void beginModule();
     468             : 
     469             :   /// Emit all Dwarf sections that should come after the content.
     470             :   void endModule() override;
     471             : 
     472             :   /// Process beginning of an instruction.
     473             :   void beginInstruction(const MachineInstr *MI) override;
     474             : 
     475             :   /// Perform an MD5 checksum of \p Identifier and return the lower 64 bits.
     476             :   static uint64_t makeTypeSignature(StringRef Identifier);
     477             : 
     478             :   /// Add a DIE to the set of types that we're going to pull into
     479             :   /// type units.
     480             :   void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
     481             :                             DIE &Die, const DICompositeType *CTy);
     482             : 
     483             :   /// Add a label so that arange data can be generated for it.
     484       39507 :   void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
     485             : 
     486             :   /// For symbols that have a size designated (e.g. common symbols),
     487             :   /// this tracks that size.
     488       64762 :   void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
     489      129524 :     SymSize[Sym] = Size;
     490       64762 :   }
     491             : 
     492             :   /// Returns whether we should emit all DW_AT_[MIPS_]linkage_name.
     493             :   /// If not, we still might emit certain cases.
     494             :   bool useAllLinkageNames() const { return UseAllLinkageNames; }
     495             : 
     496             :   /// Returns whether to use DW_OP_GNU_push_tls_address, instead of the
     497             :   /// standard DW_OP_form_tls_address opcode
     498             :   bool useGNUTLSOpcode() const { return UseGNUTLSOpcode; }
     499             : 
     500             :   /// Returns whether to use the DWARF2 format for bitfields instyead of the
     501             :   /// DWARF4 format.
     502             :   bool useDWARF2Bitfields() const { return UseDWARF2Bitfields; }
     503             : 
     504             :   // Experimental DWARF5 features.
     505             : 
     506             :   /// Returns whether or not to emit tables that dwarf consumers can
     507             :   /// use to accelerate lookup.
     508             :   bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
     509             : 
     510             :   bool useAppleExtensionAttributes() const {
     511             :     return HasAppleExtensionAttributes;
     512             :   }
     513             : 
     514             :   /// Returns whether or not to change the current debug info for the
     515             :   /// split dwarf proposal support.
     516             :   bool useSplitDwarf() const { return HasSplitDwarf; }
     517             : 
     518             :   bool shareAcrossDWOCUs() const;
     519             : 
     520             :   /// Returns the Dwarf Version.
     521             :   uint16_t getDwarfVersion() const;
     522             : 
     523             :   /// Returns the previous CU that was being updated
     524             :   const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
     525        6093 :   void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
     526             : 
     527             :   /// Returns the entries for the .debug_loc section.
     528           1 :   const DebugLocStream &getDebugLocs() const { return DebugLocs; }
     529             : 
     530             :   /// Emit an entry for the debug loc section. This can be used to
     531             :   /// handle an entry that's going to be emitted into the debug loc section.
     532             :   void emitDebugLocEntry(ByteStreamer &Streamer,
     533             :                          const DebugLocStream::Entry &Entry);
     534             : 
     535             :   /// Emit the location for a debug loc entry, including the size header.
     536             :   void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
     537             : 
     538             :   /// Find the MDNode for the given reference.
     539             :   template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
     540        2120 :     return Ref.resolve();
     541             :   }
     542             : 
     543             :   void addSubprogramNames(const DISubprogram *SP, DIE &Die);
     544             : 
     545          71 :   AddressPool &getAddressPool() { return AddrPool; }
     546             : 
     547             :   void addAccelName(StringRef Name, const DIE &Die);
     548             : 
     549             :   void addAccelObjC(StringRef Name, const DIE &Die);
     550             : 
     551             :   void addAccelNamespace(StringRef Name, const DIE &Die);
     552             : 
     553             :   void addAccelType(StringRef Name, const DIE &Die, char Flags);
     554             : 
     555             :   const MachineFunction *getCurrentFunction() const { return CurFn; }
     556             : 
     557             :   /// A helper function to check whether the DIE for a given Scope is
     558             :   /// going to be null.
     559             :   bool isLexicalScopeDIENull(LexicalScope *Scope);
     560             : 
     561             :   /// \defgroup DebuggerTuning Predicates to tune DWARF for a given debugger.
     562             :   ///
     563             :   /// Returns whether we are "tuning" for a given debugger.
     564             :   /// @{
     565             :   bool tuneForGDB() const { return DebuggerTuning == DebuggerKind::GDB; }
     566       32943 :   bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
     567             :   bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
     568             :   /// @}
     569             : };
     570             : 
     571             : } // end namespace llvm
     572             : 
     573             : #endif // LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H

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