Home | History | Annotate | Download | only in Basic 
      1 //===--- IdentifierTable.cpp - Hash table for identifier lookup -----------===//
      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 implements the IdentifierInfo, IdentifierVisitor, and
     11 // IdentifierTable interfaces.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "clang/Basic/CharInfo.h"
     16 #include "clang/Basic/IdentifierTable.h"
     17 #include "clang/Basic/LangOptions.h"
     18 #include "clang/Basic/OperatorKinds.h"
     19 #include "llvm/ADT/DenseMap.h"
     20 #include "llvm/ADT/FoldingSet.h"
     21 #include "llvm/ADT/SmallString.h"
     22 #include "llvm/Support/ErrorHandling.h"
     23 #include "llvm/Support/raw_ostream.h"
     24 #include <cstdio>
     25 
     26 using namespace clang;
     27 
     28 //===----------------------------------------------------------------------===//
     29 // IdentifierInfo Implementation
     30 //===----------------------------------------------------------------------===//
     31 
     32 IdentifierInfo::IdentifierInfo() {
     33   TokenID = tok::identifier;
     34   ObjCOrBuiltinID = 0;
     35   HasMacro = false;
     36   HadMacro = false;
     37   IsExtension = false;
     38   IsCXX11CompatKeyword = false;
     39   IsPoisoned = false;
     40   IsCPPOperatorKeyword = false;
     41   NeedsHandleIdentifier = false;
     42   IsFromAST = false;
     43   ChangedAfterLoad = false;
     44   RevertedTokenID = false;
     45   OutOfDate = false;
     46   IsModulesImport = false;
     47   FETokenInfo = nullptr;
     48   Entry = nullptr;
     49 }
     50 
     51 //===----------------------------------------------------------------------===//
     52 // IdentifierTable Implementation
     53 //===----------------------------------------------------------------------===//
     54 
     55 IdentifierIterator::~IdentifierIterator() { }
     56 
     57 IdentifierInfoLookup::~IdentifierInfoLookup() {}
     58 
     59 namespace {
     60   /// \brief A simple identifier lookup iterator that represents an
     61   /// empty sequence of identifiers.
     62   class EmptyLookupIterator : public IdentifierIterator
     63   {
     64   public:
     65     StringRef Next() override { return StringRef(); }
     66   };
     67 }
     68 
     69 IdentifierIterator *IdentifierInfoLookup::getIdentifiers() {
     70   return new EmptyLookupIterator();
     71 }
     72 
     73 ExternalIdentifierLookup::~ExternalIdentifierLookup() {}
     74 
     75 IdentifierTable::IdentifierTable(const LangOptions &LangOpts,
     76                                  IdentifierInfoLookup* externalLookup)
     77   : HashTable(8192), // Start with space for 8K identifiers.
     78     ExternalLookup(externalLookup) {
     79 
     80   // Populate the identifier table with info about keywords for the current
     81   // language.
     82   AddKeywords(LangOpts);
     83 
     84 
     85   // Add the '_experimental_modules_import' contextual keyword.
     86   get("import").setModulesImport(true);
     87 }
     88 
     89 //===----------------------------------------------------------------------===//
     90 // Language Keyword Implementation
     91 //===----------------------------------------------------------------------===//
     92 
     93 // Constants for TokenKinds.def
     94 namespace {
     95   enum {
     96     KEYC99 = 0x1,
     97     KEYCXX = 0x2,
     98     KEYCXX11 = 0x4,
     99     KEYGNU = 0x8,
    100     KEYMS = 0x10,
    101     BOOLSUPPORT = 0x20,
    102     KEYALTIVEC = 0x40,
    103     KEYNOCXX = 0x80,
    104     KEYBORLAND = 0x100,
    105     KEYOPENCL = 0x200,
    106     KEYC11 = 0x400,
    107     KEYARC = 0x800,
    108     KEYNOMS = 0x01000,
    109     WCHARSUPPORT = 0x02000,
    110     HALFSUPPORT = 0x04000,
    111     KEYALL = (0xffff & ~KEYNOMS) // Because KEYNOMS is used to exclude.
    112   };
    113 }
    114 
    115 /// AddKeyword - This method is used to associate a token ID with specific
    116 /// identifiers because they are language keywords.  This causes the lexer to
    117 /// automatically map matching identifiers to specialized token codes.
    118 ///
    119 /// The C90/C99/CPP/CPP0x flags are set to 3 if the token is a keyword in a
    120 /// future language standard, set to 2 if the token should be enabled in the
    121 /// specified language, set to 1 if it is an extension in the specified
    122 /// language, and set to 0 if disabled in the specified language.
    123 static void AddKeyword(StringRef Keyword,
    124                        tok::TokenKind TokenCode, unsigned Flags,
    125                        const LangOptions &LangOpts, IdentifierTable &Table) {
    126   unsigned AddResult = 0;
    127   if (Flags == KEYALL) AddResult = 2;
    128   else if (LangOpts.CPlusPlus && (Flags & KEYCXX)) AddResult = 2;
    129   else if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) AddResult = 2;
    130   else if (LangOpts.C99 && (Flags & KEYC99)) AddResult = 2;
    131   else if (LangOpts.GNUKeywords && (Flags & KEYGNU)) AddResult = 1;
    132   else if (LangOpts.MicrosoftExt && (Flags & KEYMS)) AddResult = 1;
    133   else if (LangOpts.Borland && (Flags & KEYBORLAND)) AddResult = 1;
    134   else if (LangOpts.Bool && (Flags & BOOLSUPPORT)) AddResult = 2;
    135   else if (LangOpts.Half && (Flags & HALFSUPPORT)) AddResult = 2;
    136   else if (LangOpts.WChar && (Flags & WCHARSUPPORT)) AddResult = 2;
    137   else if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) AddResult = 2;
    138   else if (LangOpts.OpenCL && (Flags & KEYOPENCL)) AddResult = 2;
    139   else if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) AddResult = 2;
    140   else if (LangOpts.C11 && (Flags & KEYC11)) AddResult = 2;
    141   // We treat bridge casts as objective-C keywords so we can warn on them
    142   // in non-arc mode.
    143   else if (LangOpts.ObjC2 && (Flags & KEYARC)) AddResult = 2;
    144   else if (LangOpts.CPlusPlus && (Flags & KEYCXX11)) AddResult = 3;
    145 
    146   // Don't add this keyword under MSVCCompat.
    147   if (LangOpts.MSVCCompat && (Flags & KEYNOMS))
    148      return;
    149   // Don't add this keyword if disabled in this language.
    150   if (AddResult == 0) return;
    151 
    152   IdentifierInfo &Info =
    153       Table.get(Keyword, AddResult == 3 ? tok::identifier : TokenCode);
    154   Info.setIsExtensionToken(AddResult == 1);
    155   Info.setIsCXX11CompatKeyword(AddResult == 3);
    156 }
    157 
    158 /// AddCXXOperatorKeyword - Register a C++ operator keyword alternative
    159 /// representations.
    160 static void AddCXXOperatorKeyword(StringRef Keyword,
    161                                   tok::TokenKind TokenCode,
    162                                   IdentifierTable &Table) {
    163   IdentifierInfo &Info = Table.get(Keyword, TokenCode);
    164   Info.setIsCPlusPlusOperatorKeyword();
    165 }
    166 
    167 /// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector"
    168 /// or "property".
    169 static void AddObjCKeyword(StringRef Name,
    170                            tok::ObjCKeywordKind ObjCID,
    171                            IdentifierTable &Table) {
    172   Table.get(Name).setObjCKeywordID(ObjCID);
    173 }
    174 
    175 /// AddKeywords - Add all keywords to the symbol table.
    176 ///
    177 void IdentifierTable::AddKeywords(const LangOptions &LangOpts) {
    178   // Add keywords and tokens for the current language.
    179 #define KEYWORD(NAME, FLAGS) \
    180   AddKeyword(StringRef(#NAME), tok::kw_ ## NAME,  \
    181              FLAGS, LangOpts, *this);
    182 #define ALIAS(NAME, TOK, FLAGS) \
    183   AddKeyword(StringRef(NAME), tok::kw_ ## TOK,  \
    184              FLAGS, LangOpts, *this);
    185 #define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \
    186   if (LangOpts.CXXOperatorNames)          \
    187     AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this);
    188 #define OBJC1_AT_KEYWORD(NAME) \
    189   if (LangOpts.ObjC1)          \
    190     AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
    191 #define OBJC2_AT_KEYWORD(NAME) \
    192   if (LangOpts.ObjC2)          \
    193     AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
    194 #define TESTING_KEYWORD(NAME, FLAGS)
    195 #include "clang/Basic/TokenKinds.def"
    196 
    197   if (LangOpts.ParseUnknownAnytype)
    198     AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL,
    199                LangOpts, *this);
    200 }
    201 
    202 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
    203   // We use a perfect hash function here involving the length of the keyword,
    204   // the first and third character.  For preprocessor ID's there are no
    205   // collisions (if there were, the switch below would complain about duplicate
    206   // case values).  Note that this depends on 'if' being null terminated.
    207 
    208 #define HASH(LEN, FIRST, THIRD) \
    209   (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31)
    210 #define CASE(LEN, FIRST, THIRD, NAME) \
    211   case HASH(LEN, FIRST, THIRD): \
    212     return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME
    213 
    214   unsigned Len = getLength();
    215   if (Len < 2) return tok::pp_not_keyword;
    216   const char *Name = getNameStart();
    217   switch (HASH(Len, Name[0], Name[2])) {
    218   default: return tok::pp_not_keyword;
    219   CASE( 2, 'i', '\0', if);
    220   CASE( 4, 'e', 'i', elif);
    221   CASE( 4, 'e', 's', else);
    222   CASE( 4, 'l', 'n', line);
    223   CASE( 4, 's', 'c', sccs);
    224   CASE( 5, 'e', 'd', endif);
    225   CASE( 5, 'e', 'r', error);
    226   CASE( 5, 'i', 'e', ident);
    227   CASE( 5, 'i', 'd', ifdef);
    228   CASE( 5, 'u', 'd', undef);
    229 
    230   CASE( 6, 'a', 's', assert);
    231   CASE( 6, 'd', 'f', define);
    232   CASE( 6, 'i', 'n', ifndef);
    233   CASE( 6, 'i', 'p', import);
    234   CASE( 6, 'p', 'a', pragma);
    235 
    236   CASE( 7, 'd', 'f', defined);
    237   CASE( 7, 'i', 'c', include);
    238   CASE( 7, 'w', 'r', warning);
    239 
    240   CASE( 8, 'u', 'a', unassert);
    241   CASE(12, 'i', 'c', include_next);
    242 
    243   CASE(14, '_', 'p', __public_macro);
    244 
    245   CASE(15, '_', 'p', __private_macro);
    246 
    247   CASE(16, '_', 'i', __include_macros);
    248 #undef CASE
    249 #undef HASH
    250   }
    251 }
    252 
    253 //===----------------------------------------------------------------------===//
    254 // Stats Implementation
    255 //===----------------------------------------------------------------------===//
    256 
    257 /// PrintStats - Print statistics about how well the identifier table is doing
    258 /// at hashing identifiers.
    259 void IdentifierTable::PrintStats() const {
    260   unsigned NumBuckets = HashTable.getNumBuckets();
    261   unsigned NumIdentifiers = HashTable.getNumItems();
    262   unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers;
    263   unsigned AverageIdentifierSize = 0;
    264   unsigned MaxIdentifierLength = 0;
    265 
    266   // TODO: Figure out maximum times an identifier had to probe for -stats.
    267   for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator
    268        I = HashTable.begin(), E = HashTable.end(); I != E; ++I) {
    269     unsigned IdLen = I->getKeyLength();
    270     AverageIdentifierSize += IdLen;
    271     if (MaxIdentifierLength < IdLen)
    272       MaxIdentifierLength = IdLen;
    273   }
    274 
    275   fprintf(stderr, "\n*** Identifier Table Stats:\n");
    276   fprintf(stderr, "# Identifiers:   %d\n", NumIdentifiers);
    277   fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets);
    278   fprintf(stderr, "Hash density (#identifiers per bucket): %f\n",
    279           NumIdentifiers/(double)NumBuckets);
    280   fprintf(stderr, "Ave identifier length: %f\n",
    281           (AverageIdentifierSize/(double)NumIdentifiers));
    282   fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength);
    283 
    284   // Compute statistics about the memory allocated for identifiers.
    285   HashTable.getAllocator().PrintStats();
    286 }
    287 
    288 //===----------------------------------------------------------------------===//
    289 // SelectorTable Implementation
    290 //===----------------------------------------------------------------------===//
    291 
    292 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
    293   return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
    294 }
    295 
    296 namespace clang {
    297 /// MultiKeywordSelector - One of these variable length records is kept for each
    298 /// selector containing more than one keyword. We use a folding set
    299 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to
    300 /// this class is provided strictly through Selector.
    301 class MultiKeywordSelector
    302   : public DeclarationNameExtra, public llvm::FoldingSetNode {
    303   MultiKeywordSelector(unsigned nKeys) {
    304     ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
    305   }
    306 public:
    307   // Constructor for keyword selectors.
    308   MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) {
    309     assert((nKeys > 1) && "not a multi-keyword selector");
    310     ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
    311 
    312     // Fill in the trailing keyword array.
    313     IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this+1);
    314     for (unsigned i = 0; i != nKeys; ++i)
    315       KeyInfo[i] = IIV[i];
    316   }
    317 
    318   // getName - Derive the full selector name and return it.
    319   std::string getName() const;
    320 
    321   unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; }
    322 
    323   typedef IdentifierInfo *const *keyword_iterator;
    324   keyword_iterator keyword_begin() const {
    325     return reinterpret_cast<keyword_iterator>(this+1);
    326   }
    327   keyword_iterator keyword_end() const {
    328     return keyword_begin()+getNumArgs();
    329   }
    330   IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
    331     assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
    332     return keyword_begin()[i];
    333   }
    334   static void Profile(llvm::FoldingSetNodeID &ID,
    335                       keyword_iterator ArgTys, unsigned NumArgs) {
    336     ID.AddInteger(NumArgs);
    337     for (unsigned i = 0; i != NumArgs; ++i)
    338       ID.AddPointer(ArgTys[i]);
    339   }
    340   void Profile(llvm::FoldingSetNodeID &ID) {
    341     Profile(ID, keyword_begin(), getNumArgs());
    342   }
    343 };
    344 } // end namespace clang.
    345 
    346 unsigned Selector::getNumArgs() const {
    347   unsigned IIF = getIdentifierInfoFlag();
    348   if (IIF <= ZeroArg)
    349     return 0;
    350   if (IIF == OneArg)
    351     return 1;
    352   // We point to a MultiKeywordSelector.
    353   MultiKeywordSelector *SI = getMultiKeywordSelector();
    354   return SI->getNumArgs();
    355 }
    356 
    357 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const {
    358   if (getIdentifierInfoFlag() < MultiArg) {
    359     assert(argIndex == 0 && "illegal keyword index");
    360     return getAsIdentifierInfo();
    361   }
    362   // We point to a MultiKeywordSelector.
    363   MultiKeywordSelector *SI = getMultiKeywordSelector();
    364   return SI->getIdentifierInfoForSlot(argIndex);
    365 }
    366 
    367 StringRef Selector::getNameForSlot(unsigned int argIndex) const {
    368   IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
    369   return II? II->getName() : StringRef();
    370 }
    371 
    372 std::string MultiKeywordSelector::getName() const {
    373   SmallString<256> Str;
    374   llvm::raw_svector_ostream OS(Str);
    375   for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
    376     if (*I)
    377       OS << (*I)->getName();
    378     OS << ':';
    379   }
    380 
    381   return OS.str();
    382 }
    383 
    384 std::string Selector::getAsString() const {
    385   if (InfoPtr == 0)
    386     return "<null selector>";
    387 
    388   if (getIdentifierInfoFlag() < MultiArg) {
    389     IdentifierInfo *II = getAsIdentifierInfo();
    390 
    391     // If the number of arguments is 0 then II is guaranteed to not be null.
    392     if (getNumArgs() == 0)
    393       return II->getName();
    394 
    395     if (!II)
    396       return ":";
    397 
    398     return II->getName().str() + ":";
    399   }
    400 
    401   // We have a multiple keyword selector.
    402   return getMultiKeywordSelector()->getName();
    403 }
    404 
    405 void Selector::print(llvm::raw_ostream &OS) const {
    406   OS << getAsString();
    407 }
    408 
    409 /// Interpreting the given string using the normal CamelCase
    410 /// conventions, determine whether the given string starts with the
    411 /// given "word", which is assumed to end in a lowercase letter.
    412 static bool startsWithWord(StringRef name, StringRef word) {
    413   if (name.size() < word.size()) return false;
    414   return ((name.size() == word.size() || !isLowercase(name[word.size()])) &&
    415           name.startswith(word));
    416 }
    417 
    418 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) {
    419   IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
    420   if (!first) return OMF_None;
    421 
    422   StringRef name = first->getName();
    423   if (sel.isUnarySelector()) {
    424     if (name == "autorelease") return OMF_autorelease;
    425     if (name == "dealloc") return OMF_dealloc;
    426     if (name == "finalize") return OMF_finalize;
    427     if (name == "release") return OMF_release;
    428     if (name == "retain") return OMF_retain;
    429     if (name == "retainCount") return OMF_retainCount;
    430     if (name == "self") return OMF_self;
    431   }
    432 
    433   if (name == "performSelector") return OMF_performSelector;
    434 
    435   // The other method families may begin with a prefix of underscores.
    436   while (!name.empty() && name.front() == '_')
    437     name = name.substr(1);
    438 
    439   if (name.empty()) return OMF_None;
    440   switch (name.front()) {
    441   case 'a':
    442     if (startsWithWord(name, "alloc")) return OMF_alloc;
    443     break;
    444   case 'c':
    445     if (startsWithWord(name, "copy")) return OMF_copy;
    446     break;
    447   case 'i':
    448     if (startsWithWord(name, "init")) return OMF_init;
    449     break;
    450   case 'm':
    451     if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy;
    452     break;
    453   case 'n':
    454     if (startsWithWord(name, "new")) return OMF_new;
    455     break;
    456   default:
    457     break;
    458   }
    459 
    460   return OMF_None;
    461 }
    462 
    463 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) {
    464   IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
    465   if (!first) return OIT_None;
    466 
    467   StringRef name = first->getName();
    468 
    469   if (name.empty()) return OIT_None;
    470   switch (name.front()) {
    471     case 'a':
    472       if (startsWithWord(name, "array")) return OIT_Array;
    473       break;
    474     case 'd':
    475       if (startsWithWord(name, "default")) return OIT_ReturnsSelf;
    476       if (startsWithWord(name, "dictionary")) return OIT_Dictionary;
    477       break;
    478     case 's':
    479       if (startsWithWord(name, "shared")) return OIT_ReturnsSelf;
    480       if (startsWithWord(name, "standard")) return OIT_Singleton;
    481     case 'i':
    482       if (startsWithWord(name, "init")) return OIT_Init;
    483     default:
    484       break;
    485   }
    486   return OIT_None;
    487 }
    488 
    489 namespace {
    490   struct SelectorTableImpl {
    491     llvm::FoldingSet<MultiKeywordSelector> Table;
    492     llvm::BumpPtrAllocator Allocator;
    493   };
    494 } // end anonymous namespace.
    495 
    496 static SelectorTableImpl &getSelectorTableImpl(void *P) {
    497   return *static_cast<SelectorTableImpl*>(P);
    498 }
    499 
    500 SmallString<64>
    501 SelectorTable::constructSetterName(StringRef Name) {
    502   SmallString<64> SetterName("set");
    503   SetterName += Name;
    504   SetterName[3] = toUppercase(SetterName[3]);
    505   return SetterName;
    506 }
    507 
    508 Selector
    509 SelectorTable::constructSetterSelector(IdentifierTable &Idents,
    510                                        SelectorTable &SelTable,
    511                                        const IdentifierInfo *Name) {
    512   IdentifierInfo *SetterName =
    513     &Idents.get(constructSetterName(Name->getName()));
    514   return SelTable.getUnarySelector(SetterName);
    515 }
    516 
    517 size_t SelectorTable::getTotalMemory() const {
    518   SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
    519   return SelTabImpl.Allocator.getTotalMemory();
    520 }
    521 
    522 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) {
    523   if (nKeys < 2)
    524     return Selector(IIV[0], nKeys);
    525 
    526   SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
    527 
    528   // Unique selector, to guarantee there is one per name.
    529   llvm::FoldingSetNodeID ID;
    530   MultiKeywordSelector::Profile(ID, IIV, nKeys);
    531 
    532   void *InsertPos = nullptr;
    533   if (MultiKeywordSelector *SI =
    534         SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos))
    535     return Selector(SI);
    536 
    537   // MultiKeywordSelector objects are not allocated with new because they have a
    538   // variable size array (for parameter types) at the end of them.
    539   unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *);
    540   MultiKeywordSelector *SI =
    541     (MultiKeywordSelector*)SelTabImpl.Allocator.Allocate(Size,
    542                                          llvm::alignOf<MultiKeywordSelector>());
    543   new (SI) MultiKeywordSelector(nKeys, IIV);
    544   SelTabImpl.Table.InsertNode(SI, InsertPos);
    545   return Selector(SI);
    546 }
    547 
    548 SelectorTable::SelectorTable() {
    549   Impl = new SelectorTableImpl();
    550 }
    551 
    552 SelectorTable::~SelectorTable() {
    553   delete &getSelectorTableImpl(Impl);
    554 }
    555 
    556 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) {
    557   switch (Operator) {
    558   case OO_None:
    559   case NUM_OVERLOADED_OPERATORS:
    560     return nullptr;
    561 
    562 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
    563   case OO_##Name: return Spelling;
    564 #include "clang/Basic/OperatorKinds.def"
    565   }
    566 
    567   llvm_unreachable("Invalid OverloadedOperatorKind!");
    568 }
    569