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      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 "AsmPrinterHandler.h"
     18 #include "DbgValueHistoryCalculator.h"
     19 #include "DebugLocStream.h"
     20 #include "DwarfAccelTable.h"
     21 #include "DwarfFile.h"
     22 #include "llvm/ADT/DenseMap.h"
     23 #include "llvm/ADT/DenseSet.h"
     24 #include "llvm/ADT/FoldingSet.h"
     25 #include "llvm/ADT/MapVector.h"
     26 #include "llvm/ADT/SmallPtrSet.h"
     27 #include "llvm/ADT/StringMap.h"
     28 #include "llvm/CodeGen/DIE.h"
     29 #include "llvm/CodeGen/LexicalScopes.h"
     30 #include "llvm/CodeGen/MachineInstr.h"
     31 #include "llvm/IR/DebugInfo.h"
     32 #include "llvm/IR/DebugLoc.h"
     33 #include "llvm/MC/MCDwarf.h"
     34 #include "llvm/MC/MachineLocation.h"
     35 #include "llvm/Support/Allocator.h"
     36 #include "llvm/Target/TargetOptions.h"
     37 #include <memory>
     38 
     39 namespace llvm {
     40 
     41 class AsmPrinter;
     42 class ByteStreamer;
     43 class ConstantInt;
     44 class ConstantFP;
     45 class DebugLocEntry;
     46 class DwarfCompileUnit;
     47 class DwarfDebug;
     48 class DwarfTypeUnit;
     49 class DwarfUnit;
     50 class MachineModuleInfo;
     51 
     52 //===----------------------------------------------------------------------===//
     53 /// This class is used to track local variable information.
     54 ///
     55 /// Variables can be created from allocas, in which case they're generated from
     56 /// the MMI table.  Such variables can have multiple expressions and frame
     57 /// indices.  The \a Expr and \a FrameIndices array must match.
     58 ///
     59 /// Variables can be created from \c DBG_VALUE instructions.  Those whose
     60 /// location changes over time use \a DebugLocListIndex, while those with a
     61 /// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
     62 ///
     63 /// Variables that have been optimized out use none of these fields.
     64 class DbgVariable {
     65   const DILocalVariable *Var;                /// Variable Descriptor.
     66   const DILocation *IA;                      /// Inlined at location.
     67   SmallVector<const DIExpression *, 1> Expr; /// Complex address.
     68   DIE *TheDIE = nullptr;                     /// Variable DIE.
     69   unsigned DebugLocListIndex = ~0u;          /// Offset in DebugLocs.
     70   const MachineInstr *MInsn = nullptr;       /// DBG_VALUE instruction.
     71   SmallVector<int, 1> FrameIndex;            /// Frame index.
     72   DwarfDebug *DD;
     73 
     74 public:
     75   /// Construct a DbgVariable.
     76   ///
     77   /// Creates a variable without any DW_AT_location.  Call \a initializeMMI()
     78   /// for MMI entries, or \a initializeDbgValue() for DBG_VALUE instructions.
     79   DbgVariable(const DILocalVariable *V, const DILocation *IA, DwarfDebug *DD)
     80       : Var(V), IA(IA), DD(DD) {}
     81 
     82   /// Initialize from the MMI table.
     83   void initializeMMI(const DIExpression *E, int FI) {
     84     assert(Expr.empty() && "Already initialized?");
     85     assert(FrameIndex.empty() && "Already initialized?");
     86     assert(!MInsn && "Already initialized?");
     87 
     88     assert((!E || E->isValid()) && "Expected valid expression");
     89     assert(~FI && "Expected valid index");
     90 
     91     Expr.push_back(E);
     92     FrameIndex.push_back(FI);
     93   }
     94 
     95   /// Initialize from a DBG_VALUE instruction.
     96   void initializeDbgValue(const MachineInstr *DbgValue) {
     97     assert(Expr.empty() && "Already initialized?");
     98     assert(FrameIndex.empty() && "Already initialized?");
     99     assert(!MInsn && "Already initialized?");
    100 
    101     assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
    102     assert(IA == DbgValue->getDebugLoc()->getInlinedAt() && "Wrong inlined-at");
    103 
    104     MInsn = DbgValue;
    105     if (auto *E = DbgValue->getDebugExpression())
    106       if (E->getNumElements())
    107         Expr.push_back(E);
    108   }
    109 
    110   // Accessors.
    111   const DILocalVariable *getVariable() const { return Var; }
    112   const DILocation *getInlinedAt() const { return IA; }
    113   ArrayRef<const DIExpression *> getExpression() const { return Expr; }
    114   void setDIE(DIE &D) { TheDIE = &D; }
    115   DIE *getDIE() const { return TheDIE; }
    116   void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
    117   unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
    118   StringRef getName() const { return Var->getName(); }
    119   const MachineInstr *getMInsn() const { return MInsn; }
    120   ArrayRef<int> getFrameIndex() const { return FrameIndex; }
    121 
    122   void addMMIEntry(const DbgVariable &V) {
    123     assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
    124     assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
    125     assert(V.Var == Var && "conflicting variable");
    126     assert(V.IA == IA && "conflicting inlined-at location");
    127 
    128     assert(!FrameIndex.empty() && "Expected an MMI entry");
    129     assert(!V.FrameIndex.empty() && "Expected an MMI entry");
    130     assert(Expr.size() == FrameIndex.size() && "Mismatched expressions");
    131     assert(V.Expr.size() == V.FrameIndex.size() && "Mismatched expressions");
    132 
    133     Expr.append(V.Expr.begin(), V.Expr.end());
    134     FrameIndex.append(V.FrameIndex.begin(), V.FrameIndex.end());
    135     assert(std::all_of(Expr.begin(), Expr.end(), [](const DIExpression *E) {
    136              return E && E->isBitPiece();
    137            }) && "conflicting locations for variable");
    138   }
    139 
    140   // Translate tag to proper Dwarf tag.
    141   dwarf::Tag getTag() const {
    142     // FIXME: Why don't we just infer this tag and store it all along?
    143     if (Var->isParameter())
    144       return dwarf::DW_TAG_formal_parameter;
    145 
    146     return dwarf::DW_TAG_variable;
    147   }
    148   /// Return true if DbgVariable is artificial.
    149   bool isArtificial() const {
    150     if (Var->isArtificial())
    151       return true;
    152     if (getType()->isArtificial())
    153       return true;
    154     return false;
    155   }
    156 
    157   bool isObjectPointer() const {
    158     if (Var->isObjectPointer())
    159       return true;
    160     if (getType()->isObjectPointer())
    161       return true;
    162     return false;
    163   }
    164 
    165   bool hasComplexAddress() const {
    166     assert(MInsn && "Expected DBG_VALUE, not MMI variable");
    167     assert(FrameIndex.empty() && "Expected DBG_VALUE, not MMI variable");
    168     assert(
    169         (Expr.empty() || (Expr.size() == 1 && Expr.back()->getNumElements())) &&
    170         "Invalid Expr for DBG_VALUE");
    171     return !Expr.empty();
    172   }
    173   bool isBlockByrefVariable() const;
    174   const DIType *getType() const;
    175 
    176 private:
    177   /// Look in the DwarfDebug map for the MDNode that
    178   /// corresponds to the reference.
    179   template <typename T> T *resolve(TypedDINodeRef<T> Ref) const;
    180 };
    181 
    182 
    183 /// Helper used to pair up a symbol and its DWARF compile unit.
    184 struct SymbolCU {
    185   SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}
    186   const MCSymbol *Sym;
    187   DwarfCompileUnit *CU;
    188 };
    189 
    190 /// Collects and handles dwarf debug information.
    191 class DwarfDebug : public AsmPrinterHandler {
    192   /// Target of Dwarf emission.
    193   AsmPrinter *Asm;
    194 
    195   /// Collected machine module information.
    196   MachineModuleInfo *MMI;
    197 
    198   /// All DIEValues are allocated through this allocator.
    199   BumpPtrAllocator DIEValueAllocator;
    200 
    201   /// Maps MDNode with its corresponding DwarfCompileUnit.
    202   MapVector<const MDNode *, DwarfCompileUnit *> CUMap;
    203 
    204   /// Maps subprogram MDNode with its corresponding DwarfCompileUnit.
    205   MapVector<const MDNode *, DwarfCompileUnit *> SPMap;
    206 
    207   /// Maps a CU DIE with its corresponding DwarfCompileUnit.
    208   DenseMap<const DIE *, DwarfCompileUnit *> CUDieMap;
    209 
    210   /// List of all labels used in aranges generation.
    211   std::vector<SymbolCU> ArangeLabels;
    212 
    213   /// Size of each symbol emitted (for those symbols that have a specific size).
    214   DenseMap<const MCSymbol *, uint64_t> SymSize;
    215 
    216   LexicalScopes LScopes;
    217 
    218   /// Collection of abstract variables.
    219   DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
    220   SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
    221 
    222   /// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
    223   /// can refer to them in spite of insertions into this list.
    224   DebugLocStream DebugLocs;
    225 
    226   /// This is a collection of subprogram MDNodes that are processed to
    227   /// create DIEs.
    228   SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
    229 
    230   /// Maps instruction with label emitted before instruction.
    231   DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
    232 
    233   /// Maps instruction with label emitted after instruction.
    234   DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
    235 
    236   /// History of DBG_VALUE and clobber instructions for each user
    237   /// variable.  Variables are listed in order of appearance.
    238   DbgValueHistoryMap DbgValues;
    239 
    240   /// Previous instruction's location information. This is used to
    241   /// determine label location to indicate scope boundries in dwarf
    242   /// debug info.
    243   DebugLoc PrevInstLoc;
    244   MCSymbol *PrevLabel;
    245 
    246   /// This location indicates end of function prologue and beginning of
    247   /// function body.
    248   DebugLoc PrologEndLoc;
    249 
    250   /// If nonnull, stores the current machine function we're processing.
    251   const MachineFunction *CurFn;
    252 
    253   /// If nonnull, stores the current machine instruction we're processing.
    254   const MachineInstr *CurMI;
    255 
    256   /// If nonnull, stores the CU in which the previous subprogram was contained.
    257   const DwarfCompileUnit *PrevCU;
    258 
    259   /// As an optimization, there is no need to emit an entry in the directory
    260   /// table for the same directory as DW_AT_comp_dir.
    261   StringRef CompilationDir;
    262 
    263   /// Holder for the file specific debug information.
    264   DwarfFile InfoHolder;
    265 
    266   /// Holders for the various debug information flags that we might need to
    267   /// have exposed. See accessor functions below for description.
    268 
    269   /// Map from MDNodes for user-defined types to the type units that
    270   /// describe them.
    271   DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
    272 
    273   SmallVector<
    274       std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
    275       TypeUnitsUnderConstruction;
    276 
    277   /// Whether to emit the pubnames/pubtypes sections.
    278   bool HasDwarfPubSections;
    279 
    280   /// Whether to use the GNU TLS opcode (instead of the standard opcode).
    281   bool UseGNUTLSOpcode;
    282 
    283   /// Whether to emit DW_AT_[MIPS_]linkage_name.
    284   bool UseLinkageNames;
    285 
    286   /// Version of dwarf we're emitting.
    287   unsigned DwarfVersion;
    288 
    289   /// Maps from a type identifier to the actual MDNode.
    290   DITypeIdentifierMap TypeIdentifierMap;
    291 
    292   /// DWARF5 Experimental Options
    293   /// @{
    294   bool HasDwarfAccelTables;
    295   bool HasSplitDwarf;
    296 
    297   /// Separated Dwarf Variables
    298   /// In general these will all be for bits that are left in the
    299   /// original object file, rather than things that are meant
    300   /// to be in the .dwo sections.
    301 
    302   /// Holder for the skeleton information.
    303   DwarfFile SkeletonHolder;
    304 
    305   /// Store file names for type units under fission in a line table
    306   /// header that will be emitted into debug_line.dwo.
    307   // FIXME: replace this with a map from comp_dir to table so that we
    308   // can emit multiple tables during LTO each of which uses directory
    309   // 0, referencing the comp_dir of all the type units that use it.
    310   MCDwarfDwoLineTable SplitTypeUnitFileTable;
    311   /// @}
    312 
    313   /// True iff there are multiple CUs in this module.
    314   bool SingleCU;
    315   bool IsDarwin;
    316 
    317   AddressPool AddrPool;
    318 
    319   DwarfAccelTable AccelNames;
    320   DwarfAccelTable AccelObjC;
    321   DwarfAccelTable AccelNamespace;
    322   DwarfAccelTable AccelTypes;
    323 
    324   // Identify a debugger for "tuning" the debug info.
    325   DebuggerKind DebuggerTuning;
    326 
    327   MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
    328 
    329   const SmallVectorImpl<std::unique_ptr<DwarfUnit>> &getUnits() {
    330     return InfoHolder.getUnits();
    331   }
    332 
    333   typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
    334 
    335   /// Find abstract variable associated with Var.
    336   DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
    337                                            const DILocalVariable *&Cleansed);
    338   DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
    339   void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
    340   void ensureAbstractVariableIsCreated(InlinedVariable Var,
    341                                        const MDNode *Scope);
    342   void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
    343                                                const MDNode *Scope);
    344 
    345   DbgVariable *createConcreteVariable(LexicalScope &Scope, InlinedVariable IV);
    346 
    347   /// Construct a DIE for this abstract scope.
    348   void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
    349 
    350   /// Collect info for variables that were optimized out.
    351   void collectDeadVariables();
    352 
    353   void finishVariableDefinitions();
    354 
    355   void finishSubprogramDefinitions();
    356 
    357   /// Finish off debug information after all functions have been
    358   /// processed.
    359   void finalizeModuleInfo();
    360 
    361   /// Emit the debug info section.
    362   void emitDebugInfo();
    363 
    364   /// Emit the abbreviation section.
    365   void emitAbbreviations();
    366 
    367   /// Emit a specified accelerator table.
    368   void emitAccel(DwarfAccelTable &Accel, MCSection *Section,
    369                  StringRef TableName);
    370 
    371   /// Emit visible names into a hashed accelerator table section.
    372   void emitAccelNames();
    373 
    374   /// Emit objective C classes and categories into a hashed
    375   /// accelerator table section.
    376   void emitAccelObjC();
    377 
    378   /// Emit namespace dies into a hashed accelerator table.
    379   void emitAccelNamespaces();
    380 
    381   /// Emit type dies into a hashed accelerator table.
    382   void emitAccelTypes();
    383 
    384   /// Emit visible names into a debug pubnames section.
    385   /// \param GnuStyle determines whether or not we want to emit
    386   /// additional information into the table ala newer gcc for gdb
    387   /// index.
    388   void emitDebugPubNames(bool GnuStyle = false);
    389 
    390   /// Emit visible types into a debug pubtypes section.
    391   /// \param GnuStyle determines whether or not we want to emit
    392   /// additional information into the table ala newer gcc for gdb
    393   /// index.
    394   void emitDebugPubTypes(bool GnuStyle = false);
    395 
    396   void emitDebugPubSection(
    397       bool GnuStyle, MCSection *PSec, StringRef Name,
    398       const StringMap<const DIE *> &(DwarfCompileUnit::*Accessor)() const);
    399 
    400   /// Emit visible names into a debug str section.
    401   void emitDebugStr();
    402 
    403   /// Emit visible names into a debug loc section.
    404   void emitDebugLoc();
    405 
    406   /// Emit visible names into a debug loc dwo section.
    407   void emitDebugLocDWO();
    408 
    409   /// Emit visible names into a debug aranges section.
    410   void emitDebugARanges();
    411 
    412   /// Emit visible names into a debug ranges section.
    413   void emitDebugRanges();
    414 
    415   /// DWARF 5 Experimental Split Dwarf Emitters
    416 
    417   /// Initialize common features of skeleton units.
    418   void initSkeletonUnit(const DwarfUnit &U, DIE &Die,
    419                         std::unique_ptr<DwarfUnit> NewU);
    420 
    421   /// Construct the split debug info compile unit for the debug info
    422   /// section.
    423   DwarfCompileUnit &constructSkeletonCU(const DwarfCompileUnit &CU);
    424 
    425   /// Emit the debug info dwo section.
    426   void emitDebugInfoDWO();
    427 
    428   /// Emit the debug abbrev dwo section.
    429   void emitDebugAbbrevDWO();
    430 
    431   /// Emit the debug line dwo section.
    432   void emitDebugLineDWO();
    433 
    434   /// Emit the debug str dwo section.
    435   void emitDebugStrDWO();
    436 
    437   /// Flags to let the linker know we have emitted new style pubnames. Only
    438   /// emit it here if we don't have a skeleton CU for split dwarf.
    439   void addGnuPubAttributes(DwarfUnit &U, DIE &D) const;
    440 
    441   /// Create new DwarfCompileUnit for the given metadata node with tag
    442   /// DW_TAG_compile_unit.
    443   DwarfCompileUnit &constructDwarfCompileUnit(const DICompileUnit *DIUnit);
    444 
    445   /// Construct imported_module or imported_declaration DIE.
    446   void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
    447                                         const DIImportedEntity *N);
    448 
    449   /// Register a source line with debug info. Returns the unique
    450   /// label that was emitted and which provides correspondence to the
    451   /// source line list.
    452   void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
    453                         unsigned Flags);
    454 
    455   /// Indentify instructions that are marking the beginning of or
    456   /// ending of a scope.
    457   void identifyScopeMarkers();
    458 
    459   /// Populate LexicalScope entries with variables' info.
    460   void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
    461                            DenseSet<InlinedVariable> &ProcessedVars);
    462 
    463   /// Build the location list for all DBG_VALUEs in the
    464   /// function that describe the same variable.
    465   void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
    466                          const DbgValueHistoryMap::InstrRanges &Ranges);
    467 
    468   /// Collect variable information from the side table maintained
    469   /// by MMI.
    470   void collectVariableInfoFromMMITable(DenseSet<InlinedVariable> &P);
    471 
    472   /// Ensure that a label will be emitted before MI.
    473   void requestLabelBeforeInsn(const MachineInstr *MI) {
    474     LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
    475   }
    476 
    477   /// Ensure that a label will be emitted after MI.
    478   void requestLabelAfterInsn(const MachineInstr *MI) {
    479     LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
    480   }
    481 
    482 public:
    483   //===--------------------------------------------------------------------===//
    484   // Main entry points.
    485   //
    486   DwarfDebug(AsmPrinter *A, Module *M);
    487 
    488   ~DwarfDebug() override;
    489 
    490   /// Emit all Dwarf sections that should come prior to the
    491   /// content.
    492   void beginModule();
    493 
    494   /// Emit all Dwarf sections that should come after the content.
    495   void endModule() override;
    496 
    497   /// Gather pre-function debug information.
    498   void beginFunction(const MachineFunction *MF) override;
    499 
    500   /// Gather and emit post-function debug information.
    501   void endFunction(const MachineFunction *MF) override;
    502 
    503   /// Process beginning of an instruction.
    504   void beginInstruction(const MachineInstr *MI) override;
    505 
    506   /// Process end of an instruction.
    507   void endInstruction() override;
    508 
    509   /// Perform an MD5 checksum of \p Identifier and return the lower 64 bits.
    510   static uint64_t makeTypeSignature(StringRef Identifier);
    511 
    512   /// Add a DIE to the set of types that we're going to pull into
    513   /// type units.
    514   void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
    515                             DIE &Die, const DICompositeType *CTy);
    516 
    517   /// Add a label so that arange data can be generated for it.
    518   void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
    519 
    520   /// For symbols that have a size designated (e.g. common symbols),
    521   /// this tracks that size.
    522   void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {
    523     SymSize[Sym] = Size;
    524   }
    525 
    526   /// Returns whether to emit DW_AT_[MIPS_]linkage_name.
    527   bool useLinkageNames() const { return UseLinkageNames; }
    528 
    529   /// Returns whether to use DW_OP_GNU_push_tls_address, instead of the
    530   /// standard DW_OP_form_tls_address opcode
    531   bool useGNUTLSOpcode() const { return UseGNUTLSOpcode; }
    532 
    533   /// \defgroup DebuggerTuning Predicates to tune DWARF for a given debugger.
    534   ///
    535   /// Returns whether we are "tuning" for a given debugger.
    536   /// @{
    537   bool tuneForGDB() const { return DebuggerTuning == DebuggerKind::GDB; }
    538   bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
    539   bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
    540   /// @}
    541 
    542   // Experimental DWARF5 features.
    543 
    544   /// Returns whether or not to emit tables that dwarf consumers can
    545   /// use to accelerate lookup.
    546   bool useDwarfAccelTables() const { return HasDwarfAccelTables; }
    547 
    548   /// Returns whether or not to change the current debug info for the
    549   /// split dwarf proposal support.
    550   bool useSplitDwarf() const { return HasSplitDwarf; }
    551 
    552   /// Returns the Dwarf Version.
    553   unsigned getDwarfVersion() const { return DwarfVersion; }
    554 
    555   /// Returns the previous CU that was being updated
    556   const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
    557   void setPrevCU(const DwarfCompileUnit *PrevCU) { this->PrevCU = PrevCU; }
    558 
    559   /// Returns the entries for the .debug_loc section.
    560   const DebugLocStream &getDebugLocs() const { return DebugLocs; }
    561 
    562   /// Emit an entry for the debug loc section. This can be used to
    563   /// handle an entry that's going to be emitted into the debug loc section.
    564   void emitDebugLocEntry(ByteStreamer &Streamer,
    565                          const DebugLocStream::Entry &Entry);
    566 
    567   /// Emit the location for a debug loc entry, including the size header.
    568   void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
    569 
    570   /// Find the MDNode for the given reference.
    571   template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
    572     return Ref.resolve(TypeIdentifierMap);
    573   }
    574 
    575   /// Return the TypeIdentifierMap.
    576   const DITypeIdentifierMap &getTypeIdentifierMap() const {
    577     return TypeIdentifierMap;
    578   }
    579 
    580   /// Find the DwarfCompileUnit for the given CU Die.
    581   DwarfCompileUnit *lookupUnit(const DIE *CU) const {
    582     return CUDieMap.lookup(CU);
    583   }
    584 
    585   void addSubprogramNames(const DISubprogram *SP, DIE &Die);
    586 
    587   AddressPool &getAddressPool() { return AddrPool; }
    588 
    589   void addAccelName(StringRef Name, const DIE &Die);
    590 
    591   void addAccelObjC(StringRef Name, const DIE &Die);
    592 
    593   void addAccelNamespace(StringRef Name, const DIE &Die);
    594 
    595   void addAccelType(StringRef Name, const DIE &Die, char Flags);
    596 
    597   const MachineFunction *getCurrentFunction() const { return CurFn; }
    598 
    599   /// A helper function to check whether the DIE for a given Scope is
    600   /// going to be null.
    601   bool isLexicalScopeDIENull(LexicalScope *Scope);
    602 
    603   /// Return Label preceding the instruction.
    604   MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
    605 
    606   /// Return Label immediately following the instruction.
    607   MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
    608 
    609   // FIXME: Sink these functions down into DwarfFile/Dwarf*Unit.
    610 
    611   SmallPtrSet<const MDNode *, 16> &getProcessedSPNodes() {
    612     return ProcessedSPNodes;
    613   }
    614 };
    615 } // End of namespace llvm
    616 
    617 #endif
    618