llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h

   1 //===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h --------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains support for writing Microsoft CodeView debug info.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
  14 #define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
  15
  16 #include "llvm/ADT/APSInt.h"
  17 #include "llvm/ADT/ArrayRef.h"
  18 #include "llvm/ADT/DenseMap.h"
  19 #include "llvm/ADT/DenseSet.h"
  20 #include "llvm/ADT/MapVector.h"
  21 #include "llvm/ADT/PointerUnion.h"
  22 #include "llvm/ADT/SetVector.h"
  23 #include "llvm/ADT/SmallSet.h"
  24 #include "llvm/ADT/SmallVector.h"
  25 #include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
  26 #include "llvm/CodeGen/DebugHandlerBase.h"
  27 #include "llvm/CodeGen/MachineJumpTableInfo.h"
  28 #include "llvm/DebugInfo/CodeView/CodeView.h"
  29 #include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
  30 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
  31 #include "llvm/IR/DebugLoc.h"
  32 #include "llvm/Support/Allocator.h"
  33 #include "llvm/Support/Compiler.h"
  34 #include <cstdint>
  35 #include <map>
  36 #include <string>
  37 #include <tuple>
  38 #include <unordered_map>
  39 #include <utility>
  40 #include <vector>
  41
  42 namespace llvm {
  43
  44 struct ClassInfo;
  45 class StringRef;
  46 class AsmPrinter;
  47 class Function;
  48 class GlobalVariable;
  49 class MCSectionCOFF;
  50 class MCStreamer;
  51 class MCSymbol;
  52 class MachineFunction;
  53
  54 /// Collects and handles line tables information in a CodeView format.
  55 class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
  56 public:
  57   struct LocalVarDef {
  58     /// Indicates that variable data is stored in memory relative to the
  59     /// specified register.
  60     int InMemory : 1;
  61
  62     /// Offset of variable data in memory.
  63     int DataOffset : 31;
  64
  65     /// Non-zero if this is a piece of an aggregate.
  66     uint16_t IsSubfield : 1;
  67
  68     /// Offset into aggregate.
  69     uint16_t StructOffset : 15;
  70
  71     /// Register containing the data or the register base of the memory
  72     /// location containing the data.
  73     uint16_t CVRegister;
  74
  75     uint64_t static toOpaqueValue(const LocalVarDef DR) {
  76       uint64_t Val = 0;
  77       std::memcpy(&Val, &DR, sizeof(Val));
  78       return Val;
  79     }
  80
  81     LocalVarDef static createFromOpaqueValue(uint64_t Val) {
  82       LocalVarDef DR;
  83       std::memcpy(&DR, &Val, sizeof(Val));
  84       return DR;
  85     }
  86   };
  87
  88   static_assert(sizeof(uint64_t) == sizeof(LocalVarDef));
  89
  90 private:
  91   MCStreamer &OS;
  92   BumpPtrAllocator Allocator;
  93   codeview::GlobalTypeTableBuilder TypeTable;
  94
  95   /// Whether to emit type record hashes into .debug$H.
  96   bool EmitDebugGlobalHashes = false;
  97
  98   /// The codeview CPU type used by the translation unit.
  99   codeview::CPUType TheCPU;
 100
 101   static LocalVarDef createDefRangeMem(uint16_t CVRegister, int Offset);
 102
 103   /// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
 104   struct LocalVariable {
 105     const DILocalVariable *DIVar = nullptr;
 106     MapVector<LocalVarDef,
 107               SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 1>>
 108         DefRanges;
 109     bool UseReferenceType = false;
 110     std::optional<APSInt> ConstantValue;
 111   };
 112
 113   struct CVGlobalVariable {
 114     const DIGlobalVariable *DIGV;
 115     PointerUnion<const GlobalVariable *, const DIExpression *> GVInfo;
 116   };
 117
 118   struct InlineSite {
 119     SmallVector<LocalVariable, 1> InlinedLocals;
 120     SmallVector<const DILocation *, 1> ChildSites;
 121     const DISubprogram *Inlinee = nullptr;
 122
 123     /// The ID of the inline site or function used with .cv_loc. Not a type
 124     /// index.
 125     unsigned SiteFuncId = 0;
 126   };
 127
 128   // Combines information from DILexicalBlock and LexicalScope.
 129   struct LexicalBlock {
 130     SmallVector<LocalVariable, 1> Locals;
 131     SmallVector<CVGlobalVariable, 1> Globals;
 132     SmallVector<LexicalBlock *, 1> Children;
 133     const MCSymbol *Begin;
 134     const MCSymbol *End;
 135     StringRef Name;
 136   };
 137
 138   struct JumpTableInfo {
 139     codeview::JumpTableEntrySize EntrySize;
 140     const MCSymbol *Base;
 141     uint64_t BaseOffset;
 142     const MCSymbol *Branch;
 143     const MCSymbol *Table;
 144     size_t TableSize;
 145   };
 146
 147   // For each function, store a vector of labels to its instructions, as well as
 148   // to the end of the function.
 149   struct FunctionInfo {
 150     FunctionInfo() = default;
 151
 152     // Uncopyable.
 153     FunctionInfo(const FunctionInfo &FI) = delete;
 154
 155     /// Map from inlined call site to inlined instructions and child inlined
 156     /// call sites. Listed in program order.
 157     std::unordered_map<const DILocation *, InlineSite> InlineSites;
 158
 159     /// Ordered list of top-level inlined call sites.
 160     SmallVector<const DILocation *, 1> ChildSites;
 161
 162     /// Set of all functions directly inlined into this one.
 163     SmallSet<codeview::TypeIndex, 1> Inlinees;
 164
 165     SmallVector<LocalVariable, 1> Locals;
 166     SmallVector<CVGlobalVariable, 1> Globals;
 167
 168     std::unordered_map<const DILexicalBlockBase*, LexicalBlock> LexicalBlocks;
 169
 170     // Lexical blocks containing local variables.
 171     SmallVector<LexicalBlock *, 1> ChildBlocks;
 172
 173     std::vector<std::pair<MCSymbol *, MDNode *>> Annotations;
 174     std::vector<std::tuple<const MCSymbol *, const MCSymbol *, const DIType *>>
 175         HeapAllocSites;
 176
 177     std::vector<JumpTableInfo> JumpTables;
 178
 179     const MCSymbol *Begin = nullptr;
 180     const MCSymbol *End = nullptr;
 181     unsigned FuncId = 0;
 182     unsigned LastFileId = 0;
 183
 184     /// Number of bytes allocated in the prologue for all local stack objects.
 185     unsigned FrameSize = 0;
 186
 187     /// Number of bytes of parameters on the stack.
 188     unsigned ParamSize = 0;
 189
 190     /// Number of bytes pushed to save CSRs.
 191     unsigned CSRSize = 0;
 192
 193     /// Adjustment to apply on x86 when using the VFRAME frame pointer.
 194     int OffsetAdjustment = 0;
 195
 196     /// Two-bit value indicating which register is the designated frame pointer
 197     /// register for local variables. Included in S_FRAMEPROC.
 198     codeview::EncodedFramePtrReg EncodedLocalFramePtrReg =
 199         codeview::EncodedFramePtrReg::None;
 200
 201     /// Two-bit value indicating which register is the designated frame pointer
 202     /// register for stack parameters. Included in S_FRAMEPROC.
 203     codeview::EncodedFramePtrReg EncodedParamFramePtrReg =
 204         codeview::EncodedFramePtrReg::None;
 205
 206     codeview::FrameProcedureOptions FrameProcOpts;
 207
 208     bool HasStackRealignment = false;
 209
 210     bool HaveLineInfo = false;
 211
 212     bool HasFramePointer = false;
 213   };
 214   FunctionInfo *CurFn = nullptr;
 215
 216   codeview::SourceLanguage CurrentSourceLanguage =
 217       codeview::SourceLanguage::Masm;
 218
 219   // This map records the constant offset in DIExpression of the
 220   // DIGlobalVariableExpression referencing the DIGlobalVariable.
 221   DenseMap<const DIGlobalVariable *, uint64_t> CVGlobalVariableOffsets;
 222
 223   // Map used to seperate variables according to the lexical scope they belong
 224   // in.  This is populated by recordLocalVariable() before
 225   // collectLexicalBlocks() separates the variables between the FunctionInfo
 226   // and LexicalBlocks.
 227   DenseMap<const LexicalScope *, SmallVector<LocalVariable, 1>> ScopeVariables;
 228
 229   // Map to separate global variables according to the lexical scope they
 230   // belong in. A null local scope represents the global scope.
 231   typedef SmallVector<CVGlobalVariable, 1> GlobalVariableList;
 232   DenseMap<const DIScope*, std::unique_ptr<GlobalVariableList> > ScopeGlobals;
 233
 234   // Array of global variables which  need to be emitted into a COMDAT section.
 235   SmallVector<CVGlobalVariable, 1> ComdatVariables;
 236
 237   // Array of non-COMDAT global variables.
 238   SmallVector<CVGlobalVariable, 1> GlobalVariables;
 239
 240   /// List of static const data members to be emitted as S_CONSTANTs.
 241   SmallVector<const DIDerivedType *, 4> StaticConstMembers;
 242
 243   /// The set of comdat .debug$S sections that we've seen so far. Each section
 244   /// must start with a magic version number that must only be emitted once.
 245   /// This set tracks which sections we've already opened.
 246   DenseSet<MCSectionCOFF *> ComdatDebugSections;
 247
 248   /// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
 249   /// of an emitted global value, is in a comdat COFF section, this will switch
 250   /// to a new .debug$S section in that comdat. This method ensures that the
 251   /// section starts with the magic version number on first use. If GVSym is
 252   /// null, uses the main .debug$S section.
 253   void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
 254
 255   /// The next available function index for use with our .cv_* directives. Not
 256   /// to be confused with type indices for LF_FUNC_ID records.
 257   unsigned NextFuncId = 0;
 258
 259   InlineSite &getInlineSite(const DILocation *InlinedAt,
 260                             const DISubprogram *Inlinee);
 261
 262   codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
 263
 264   void calculateRanges(LocalVariable &Var,
 265                        const DbgValueHistoryMap::Entries &Entries);
 266
 267   /// Remember some debug info about each function. Keep it in a stable order to
 268   /// emit at the end of the TU.
 269   MapVector<const Function *, std::unique_ptr<FunctionInfo>> FnDebugInfo;
 270
 271   /// Map from full file path to .cv_file id. Full paths are built from DIFiles
 272   /// and are stored in FileToFilepathMap;
 273   DenseMap<StringRef, unsigned> FileIdMap;
 274
 275   /// All inlined subprograms in the order they should be emitted.
 276   SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
 277
 278   /// Map from a pair of DI metadata nodes and its DI type (or scope) that can
 279   /// be nullptr, to CodeView type indices. Primarily indexed by
 280   /// {DIType*, DIType*} and {DISubprogram*, DIType*}.
 281   ///
 282   /// The second entry in the key is needed for methods as DISubroutineType
 283   /// representing static method type are shared with non-method function type.
 284   DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
 285       TypeIndices;
 286
 287   /// Map from DICompositeType* to complete type index. Non-record types are
 288   /// always looked up in the normal TypeIndices map.
 289   DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
 290
 291   /// Complete record types to emit after all active type lowerings are
 292   /// finished.
 293   SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
 294
 295   /// Number of type lowering frames active on the stack.
 296   unsigned TypeEmissionLevel = 0;
 297
 298   codeview::TypeIndex VBPType;
 299
 300   const DISubprogram *CurrentSubprogram = nullptr;
 301
 302   // The UDTs we have seen while processing types; each entry is a pair of type
 303   // index and type name.
 304   std::vector<std::pair<std::string, const DIType *>> LocalUDTs;
 305   std::vector<std::pair<std::string, const DIType *>> GlobalUDTs;
 306
 307   using FileToFilepathMapTy = std::map<const DIFile *, std::string>;
 308   FileToFilepathMapTy FileToFilepathMap;
 309
 310   StringRef getFullFilepath(const DIFile *File);
 311
 312   unsigned maybeRecordFile(const DIFile *F);
 313
 314   void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
 315
 316   void clear();
 317
 318   void setCurrentSubprogram(const DISubprogram *SP) {
 319     CurrentSubprogram = SP;
 320     LocalUDTs.clear();
 321   }
 322
 323   /// Emit the magic version number at the start of a CodeView type or symbol
 324   /// section. Appears at the front of every .debug$S or .debug$T or .debug$P
 325   /// section.
 326   void emitCodeViewMagicVersion();
 327
 328   void emitTypeInformation();
 329
 330   void emitTypeGlobalHashes();
 331
 332   void emitObjName();
 333
 334   void emitCompilerInformation();
 335
 336   void emitBuildInfo();
 337
 338   void emitInlineeLinesSubsection();
 339
 340   void emitDebugInfoForThunk(const Function *GV,
 341                              FunctionInfo &FI,
 342                              const MCSymbol *Fn);
 343
 344   void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
 345
 346   void emitDebugInfoForRetainedTypes();
 347
 348   void emitDebugInfoForUDTs(
 349       const std::vector<std::pair<std::string, const DIType *>> &UDTs);
 350
 351   void collectDebugInfoForGlobals();
 352   void emitDebugInfoForGlobals();
 353   void emitGlobalVariableList(ArrayRef<CVGlobalVariable> Globals);
 354   void emitConstantSymbolRecord(const DIType *DTy, APSInt &Value,
 355                                 const std::string &QualifiedName);
 356   void emitDebugInfoForGlobal(const CVGlobalVariable &CVGV);
 357   void emitStaticConstMemberList();
 358
 359   /// Opens a subsection of the given kind in a .debug$S codeview section.
 360   /// Returns an end label for use with endCVSubsection when the subsection is
 361   /// finished.
 362   MCSymbol *beginCVSubsection(codeview::DebugSubsectionKind Kind);
 363   void endCVSubsection(MCSymbol *EndLabel);
 364
 365   /// Opens a symbol record of the given kind. Returns an end label for use with
 366   /// endSymbolRecord.
 367   MCSymbol *beginSymbolRecord(codeview::SymbolKind Kind);
 368   void endSymbolRecord(MCSymbol *SymEnd);
 369
 370   /// Emits an S_END, S_INLINESITE_END, or S_PROC_ID_END record. These records
 371   /// are empty, so we emit them with a simpler assembly sequence that doesn't
 372   /// involve labels.
 373   void emitEndSymbolRecord(codeview::SymbolKind EndKind);
 374
 375   void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
 376                            const InlineSite &Site);
 377
 378   void emitInlinees(const SmallSet<codeview::TypeIndex, 1> &Inlinees);
 379
 380   using InlinedEntity = DbgValueHistoryMap::InlinedEntity;
 381
 382   void collectGlobalVariableInfo();
 383   void collectVariableInfo(const DISubprogram *SP);
 384
 385   void collectVariableInfoFromMFTable(DenseSet<InlinedEntity> &Processed);
 386
 387   // Construct the lexical block tree for a routine, pruning emptpy lexical
 388   // scopes, and populate it with local variables.
 389   void collectLexicalBlockInfo(SmallVectorImpl<LexicalScope *> &Scopes,
 390                                SmallVectorImpl<LexicalBlock *> &Blocks,
 391                                SmallVectorImpl<LocalVariable> &Locals,
 392                                SmallVectorImpl<CVGlobalVariable> &Globals);
 393   void collectLexicalBlockInfo(LexicalScope &Scope,
 394                                SmallVectorImpl<LexicalBlock *> &ParentBlocks,
 395                                SmallVectorImpl<LocalVariable> &ParentLocals,
 396                                SmallVectorImpl<CVGlobalVariable> &ParentGlobals);
 397
 398   /// Records information about a local variable in the appropriate scope. In
 399   /// particular, locals from inlined code live inside the inlining site.
 400   void recordLocalVariable(LocalVariable &&Var, const LexicalScope *LS);
 401
 402   /// Emits local variables in the appropriate order.
 403   void emitLocalVariableList(const FunctionInfo &FI,
 404                              ArrayRef<LocalVariable> Locals);
 405
 406   /// Emits an S_LOCAL record and its associated defined ranges.
 407   void emitLocalVariable(const FunctionInfo &FI, const LocalVariable &Var);
 408
 409   /// Emits a sequence of lexical block scopes and their children.
 410   void emitLexicalBlockList(ArrayRef<LexicalBlock *> Blocks,
 411                             const FunctionInfo& FI);
 412
 413   /// Emit a lexical block scope and its children.
 414   void emitLexicalBlock(const LexicalBlock &Block, const FunctionInfo& FI);
 415
 416   /// Translates the DIType to codeview if necessary and returns a type index
 417   /// for it.
 418   codeview::TypeIndex getTypeIndex(const DIType *Ty,
 419                                    const DIType *ClassTy = nullptr);
 420
 421   codeview::TypeIndex
 422   getTypeIndexForThisPtr(const DIDerivedType *PtrTy,
 423                          const DISubroutineType *SubroutineTy);
 424
 425   codeview::TypeIndex getTypeIndexForReferenceTo(const DIType *Ty);
 426
 427   codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
 428                                             const DICompositeType *Class);
 429
 430   codeview::TypeIndex getScopeIndex(const DIScope *Scope);
 431
 432   codeview::TypeIndex getVBPTypeIndex();
 433
 434   void addToUDTs(const DIType *Ty);
 435
 436   void addUDTSrcLine(const DIType *Ty, codeview::TypeIndex TI);
 437
 438   codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
 439   codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
 440   codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
 441   codeview::TypeIndex lowerTypeString(const DIStringType *Ty);
 442   codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
 443   codeview::TypeIndex lowerTypePointer(
 444       const DIDerivedType *Ty,
 445       codeview::PointerOptions PO = codeview::PointerOptions::None);
 446   codeview::TypeIndex lowerTypeMemberPointer(
 447       const DIDerivedType *Ty,
 448       codeview::PointerOptions PO = codeview::PointerOptions::None);
 449   codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
 450   codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
 451   codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
 452   codeview::TypeIndex lowerTypeMemberFunction(
 453       const DISubroutineType *Ty, const DIType *ClassTy, int ThisAdjustment,
 454       bool IsStaticMethod,
 455       codeview::FunctionOptions FO = codeview::FunctionOptions::None);
 456   codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
 457   codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
 458   codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
 459
 460   /// Symbol records should point to complete types, but type records should
 461   /// always point to incomplete types to avoid cycles in the type graph. Only
 462   /// use this entry point when generating symbol records. The complete and
 463   /// incomplete type indices only differ for record types. All other types use
 464   /// the same index.
 465   codeview::TypeIndex getCompleteTypeIndex(const DIType *Ty);
 466
 467   codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
 468   codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
 469
 470   struct TypeLoweringScope;
 471
 472   void emitDeferredCompleteTypes();
 473
 474   void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
 475   ClassInfo collectClassInfo(const DICompositeType *Ty);
 476
 477   /// Common record member lowering functionality for record types, which are
 478   /// structs, classes, and unions. Returns the field list index and the member
 479   /// count.
 480   std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
 481   lowerRecordFieldList(const DICompositeType *Ty);
 482
 483   /// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
 484   codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
 485                                                codeview::TypeIndex TI,
 486                                                const DIType *ClassTy = nullptr);
 487
 488   /// Collect the names of parent scopes, innermost to outermost. Return the
 489   /// innermost subprogram scope if present. Ensure that parent type scopes are
 490   /// inserted into the type table.
 491   const DISubprogram *
 492   collectParentScopeNames(const DIScope *Scope,
 493                           SmallVectorImpl<StringRef> &ParentScopeNames);
 494   std::string getFullyQualifiedName(const DIScope *Scope, StringRef Name);
 495   std::string getFullyQualifiedName(const DIScope *Scope);
 496
 497   unsigned getPointerSizeInBytes();
 498
 499   void discoverJumpTableBranches(const MachineFunction *MF, bool isThumb);
 500   void collectDebugInfoForJumpTables(const MachineFunction *MF, bool isThumb);
 501   void emitDebugInfoForJumpTables(const FunctionInfo &FI);
 502
 503 protected:
 504   /// Gather pre-function debug information.
 505   void beginFunctionImpl(const MachineFunction *MF) override;
 506
 507   /// Gather post-function debug information.
 508   void endFunctionImpl(const MachineFunction *) override;
 509
 510   /// Check if the current module is in Fortran.
 511   bool moduleIsInFortran() {
 512     return CurrentSourceLanguage == codeview::SourceLanguage::Fortran;
 513   }
 514
 515 public:
 516   CodeViewDebug(AsmPrinter *AP);
 517
 518   void beginModule(Module *M) override;
 519
 520   void setSymbolSize(const MCSymbol *, uint64_t) override {}
 521
 522   /// Emit the COFF section that holds the line table information.
 523   void endModule() override;
 524
 525   /// Process beginning of an instruction.
 526   void beginInstruction(const MachineInstr *MI) override;
 527 };
 528
 529 template <> struct DenseMapInfo<CodeViewDebug::LocalVarDef> {
 530
 531   static inline CodeViewDebug::LocalVarDef getEmptyKey() {
 532     return CodeViewDebug::LocalVarDef::createFromOpaqueValue(~0ULL);
 533   }
 534
 535   static inline CodeViewDebug::LocalVarDef getTombstoneKey() {
 536     return CodeViewDebug::LocalVarDef::createFromOpaqueValue(~0ULL - 1ULL);
 537   }
 538
 539   static unsigned getHashValue(const CodeViewDebug::LocalVarDef &DR) {
 540     return CodeViewDebug::LocalVarDef::toOpaqueValue(DR) * 37ULL;
 541   }
 542
 543   static bool isEqual(const CodeViewDebug::LocalVarDef &LHS,
 544                       const CodeViewDebug::LocalVarDef &RHS) {
 545     return CodeViewDebug::LocalVarDef::toOpaqueValue(LHS) ==
 546            CodeViewDebug::LocalVarDef::toOpaqueValue(RHS);
 547   }
 548 };
 549
 550 } // end namespace llvm
 551
 552 #endif // LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H