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 "clang/Basic/Specifiers.h"
20#include "llvm/ADT/DenseMap.h"
21#include "llvm/ADT/FoldingSet.h"
22#include "llvm/ADT/SmallString.h"
23#include "llvm/Support/ErrorHandling.h"
24#include "llvm/Support/raw_ostream.h"
25#include <cstdio>
26
27using namespace clang;
28
29//===----------------------------------------------------------------------===//
30// IdentifierInfo Implementation
31//===----------------------------------------------------------------------===//
32
33IdentifierInfo::IdentifierInfo() {
34  TokenID = tok::identifier;
35  ObjCOrBuiltinID = 0;
36  HasMacro = false;
37  HadMacro = false;
38  IsExtension = false;
39  IsFutureCompatKeyword = false;
40  IsPoisoned = false;
41  IsCPPOperatorKeyword = false;
42  NeedsHandleIdentifier = false;
43  IsFromAST = false;
44  ChangedAfterLoad = false;
45  FEChangedAfterLoad = false;
46  RevertedTokenID = false;
47  OutOfDate = false;
48  IsModulesImport = false;
49  FETokenInfo = nullptr;
50  Entry = nullptr;
51}
52
53//===----------------------------------------------------------------------===//
54// IdentifierTable Implementation
55//===----------------------------------------------------------------------===//
56
57IdentifierIterator::~IdentifierIterator() { }
58
59IdentifierInfoLookup::~IdentifierInfoLookup() {}
60
61namespace {
62  /// \brief A simple identifier lookup iterator that represents an
63  /// empty sequence of identifiers.
64  class EmptyLookupIterator : public IdentifierIterator
65  {
66  public:
67    StringRef Next() override { return StringRef(); }
68  };
69}
70
71IdentifierIterator *IdentifierInfoLookup::getIdentifiers() {
72  return new EmptyLookupIterator();
73}
74
75IdentifierTable::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
94namespace {
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    KEYNOMS18 = 0x01000,
109    KEYNOOPENCL = 0x02000,
110    WCHARSUPPORT = 0x04000,
111    HALFSUPPORT = 0x08000,
112    KEYCONCEPTS = 0x10000,
113    KEYOBJC2    = 0x20000,
114    KEYZVECTOR  = 0x40000,
115    KEYCOROUTINES = 0x80000,
116    KEYALL = (0xfffff & ~KEYNOMS18 &
117              ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
118  };
119
120  /// \brief How a keyword is treated in the selected standard.
121  enum KeywordStatus {
122    KS_Disabled,    // Disabled
123    KS_Extension,   // Is an extension
124    KS_Enabled,     // Enabled
125    KS_Future       // Is a keyword in future standard
126  };
127}
128
129/// \brief Translates flags as specified in TokenKinds.def into keyword status
130/// in the given language standard.
131static KeywordStatus getKeywordStatus(const LangOptions &LangOpts,
132                                      unsigned Flags) {
133  if (Flags == KEYALL) return KS_Enabled;
134  if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled;
135  if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled;
136  if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled;
137  if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension;
138  if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension;
139  if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension;
140  if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled;
141  if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled;
142  if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled;
143  if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled;
144  if (LangOpts.OpenCL && (Flags & KEYOPENCL)) return KS_Enabled;
145  if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled;
146  if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled;
147  // We treat bridge casts as objective-C keywords so we can warn on them
148  // in non-arc mode.
149  if (LangOpts.ObjC2 && (Flags & KEYARC)) return KS_Enabled;
150  if (LangOpts.ConceptsTS && (Flags & KEYCONCEPTS)) return KS_Enabled;
151  if (LangOpts.ObjC2 && (Flags & KEYOBJC2)) return KS_Enabled;
152  if (LangOpts.Coroutines && (Flags & KEYCOROUTINES)) return KS_Enabled;
153  if (LangOpts.CPlusPlus && (Flags & KEYCXX11)) return KS_Future;
154  return KS_Disabled;
155}
156
157/// AddKeyword - This method is used to associate a token ID with specific
158/// identifiers because they are language keywords.  This causes the lexer to
159/// automatically map matching identifiers to specialized token codes.
160static void AddKeyword(StringRef Keyword,
161                       tok::TokenKind TokenCode, unsigned Flags,
162                       const LangOptions &LangOpts, IdentifierTable &Table) {
163  KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags);
164
165  // Don't add this keyword under MSVCCompat.
166  if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) &&
167      !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015))
168    return;
169
170  // Don't add this keyword under OpenCL.
171  if (LangOpts.OpenCL && (Flags & KEYNOOPENCL))
172    return;
173
174  // Don't add this keyword if disabled in this language.
175  if (AddResult == KS_Disabled) return;
176
177  IdentifierInfo &Info =
178      Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode);
179  Info.setIsExtensionToken(AddResult == KS_Extension);
180  Info.setIsFutureCompatKeyword(AddResult == KS_Future);
181}
182
183/// AddCXXOperatorKeyword - Register a C++ operator keyword alternative
184/// representations.
185static void AddCXXOperatorKeyword(StringRef Keyword,
186                                  tok::TokenKind TokenCode,
187                                  IdentifierTable &Table) {
188  IdentifierInfo &Info = Table.get(Keyword, TokenCode);
189  Info.setIsCPlusPlusOperatorKeyword();
190}
191
192/// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector"
193/// or "property".
194static void AddObjCKeyword(StringRef Name,
195                           tok::ObjCKeywordKind ObjCID,
196                           IdentifierTable &Table) {
197  Table.get(Name).setObjCKeywordID(ObjCID);
198}
199
200/// AddKeywords - Add all keywords to the symbol table.
201///
202void IdentifierTable::AddKeywords(const LangOptions &LangOpts) {
203  // Add keywords and tokens for the current language.
204#define KEYWORD(NAME, FLAGS) \
205  AddKeyword(StringRef(#NAME), tok::kw_ ## NAME,  \
206             FLAGS, LangOpts, *this);
207#define ALIAS(NAME, TOK, FLAGS) \
208  AddKeyword(StringRef(NAME), tok::kw_ ## TOK,  \
209             FLAGS, LangOpts, *this);
210#define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \
211  if (LangOpts.CXXOperatorNames)          \
212    AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this);
213#define OBJC1_AT_KEYWORD(NAME) \
214  if (LangOpts.ObjC1)          \
215    AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
216#define OBJC2_AT_KEYWORD(NAME) \
217  if (LangOpts.ObjC2)          \
218    AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
219#define TESTING_KEYWORD(NAME, FLAGS)
220#include "clang/Basic/TokenKinds.def"
221
222  if (LangOpts.ParseUnknownAnytype)
223    AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL,
224               LangOpts, *this);
225
226  if (LangOpts.DeclSpecKeyword)
227    AddKeyword("__declspec", tok::kw___declspec, KEYALL, LangOpts, *this);
228}
229
230/// \brief Checks if the specified token kind represents a keyword in the
231/// specified language.
232/// \returns Status of the keyword in the language.
233static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts,
234                                      tok::TokenKind K) {
235  switch (K) {
236#define KEYWORD(NAME, FLAGS) \
237  case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS);
238#include "clang/Basic/TokenKinds.def"
239  default: return KS_Disabled;
240  }
241}
242
243/// \brief Returns true if the identifier represents a keyword in the
244/// specified language.
245bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) {
246  switch (getTokenKwStatus(LangOpts, getTokenID())) {
247  case KS_Enabled:
248  case KS_Extension:
249    return true;
250  default:
251    return false;
252  }
253}
254
255tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
256  // We use a perfect hash function here involving the length of the keyword,
257  // the first and third character.  For preprocessor ID's there are no
258  // collisions (if there were, the switch below would complain about duplicate
259  // case values).  Note that this depends on 'if' being null terminated.
260
261#define HASH(LEN, FIRST, THIRD) \
262  (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31)
263#define CASE(LEN, FIRST, THIRD, NAME) \
264  case HASH(LEN, FIRST, THIRD): \
265    return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME
266
267  unsigned Len = getLength();
268  if (Len < 2) return tok::pp_not_keyword;
269  const char *Name = getNameStart();
270  switch (HASH(Len, Name[0], Name[2])) {
271  default: return tok::pp_not_keyword;
272  CASE( 2, 'i', '\0', if);
273  CASE( 4, 'e', 'i', elif);
274  CASE( 4, 'e', 's', else);
275  CASE( 4, 'l', 'n', line);
276  CASE( 4, 's', 'c', sccs);
277  CASE( 5, 'e', 'd', endif);
278  CASE( 5, 'e', 'r', error);
279  CASE( 5, 'i', 'e', ident);
280  CASE( 5, 'i', 'd', ifdef);
281  CASE( 5, 'u', 'd', undef);
282
283  CASE( 6, 'a', 's', assert);
284  CASE( 6, 'd', 'f', define);
285  CASE( 6, 'i', 'n', ifndef);
286  CASE( 6, 'i', 'p', import);
287  CASE( 6, 'p', 'a', pragma);
288
289  CASE( 7, 'd', 'f', defined);
290  CASE( 7, 'i', 'c', include);
291  CASE( 7, 'w', 'r', warning);
292
293  CASE( 8, 'u', 'a', unassert);
294  CASE(12, 'i', 'c', include_next);
295
296  CASE(14, '_', 'p', __public_macro);
297
298  CASE(15, '_', 'p', __private_macro);
299
300  CASE(16, '_', 'i', __include_macros);
301#undef CASE
302#undef HASH
303  }
304}
305
306//===----------------------------------------------------------------------===//
307// Stats Implementation
308//===----------------------------------------------------------------------===//
309
310/// PrintStats - Print statistics about how well the identifier table is doing
311/// at hashing identifiers.
312void IdentifierTable::PrintStats() const {
313  unsigned NumBuckets = HashTable.getNumBuckets();
314  unsigned NumIdentifiers = HashTable.getNumItems();
315  unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers;
316  unsigned AverageIdentifierSize = 0;
317  unsigned MaxIdentifierLength = 0;
318
319  // TODO: Figure out maximum times an identifier had to probe for -stats.
320  for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator
321       I = HashTable.begin(), E = HashTable.end(); I != E; ++I) {
322    unsigned IdLen = I->getKeyLength();
323    AverageIdentifierSize += IdLen;
324    if (MaxIdentifierLength < IdLen)
325      MaxIdentifierLength = IdLen;
326  }
327
328  fprintf(stderr, "\n*** Identifier Table Stats:\n");
329  fprintf(stderr, "# Identifiers:   %d\n", NumIdentifiers);
330  fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets);
331  fprintf(stderr, "Hash density (#identifiers per bucket): %f\n",
332          NumIdentifiers/(double)NumBuckets);
333  fprintf(stderr, "Ave identifier length: %f\n",
334          (AverageIdentifierSize/(double)NumIdentifiers));
335  fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength);
336
337  // Compute statistics about the memory allocated for identifiers.
338  HashTable.getAllocator().PrintStats();
339}
340
341//===----------------------------------------------------------------------===//
342// SelectorTable Implementation
343//===----------------------------------------------------------------------===//
344
345unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
346  return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
347}
348
349namespace clang {
350/// MultiKeywordSelector - One of these variable length records is kept for each
351/// selector containing more than one keyword. We use a folding set
352/// to unique aggregate names (keyword selectors in ObjC parlance). Access to
353/// this class is provided strictly through Selector.
354class MultiKeywordSelector
355  : public DeclarationNameExtra, public llvm::FoldingSetNode {
356  MultiKeywordSelector(unsigned nKeys) {
357    ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
358  }
359public:
360  // Constructor for keyword selectors.
361  MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) {
362    assert((nKeys > 1) && "not a multi-keyword selector");
363    ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
364
365    // Fill in the trailing keyword array.
366    IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this+1);
367    for (unsigned i = 0; i != nKeys; ++i)
368      KeyInfo[i] = IIV[i];
369  }
370
371  // getName - Derive the full selector name and return it.
372  std::string getName() const;
373
374  unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; }
375
376  typedef IdentifierInfo *const *keyword_iterator;
377  keyword_iterator keyword_begin() const {
378    return reinterpret_cast<keyword_iterator>(this+1);
379  }
380  keyword_iterator keyword_end() const {
381    return keyword_begin()+getNumArgs();
382  }
383  IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
384    assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
385    return keyword_begin()[i];
386  }
387  static void Profile(llvm::FoldingSetNodeID &ID,
388                      keyword_iterator ArgTys, unsigned NumArgs) {
389    ID.AddInteger(NumArgs);
390    for (unsigned i = 0; i != NumArgs; ++i)
391      ID.AddPointer(ArgTys[i]);
392  }
393  void Profile(llvm::FoldingSetNodeID &ID) {
394    Profile(ID, keyword_begin(), getNumArgs());
395  }
396};
397} // end namespace clang.
398
399unsigned Selector::getNumArgs() const {
400  unsigned IIF = getIdentifierInfoFlag();
401  if (IIF <= ZeroArg)
402    return 0;
403  if (IIF == OneArg)
404    return 1;
405  // We point to a MultiKeywordSelector.
406  MultiKeywordSelector *SI = getMultiKeywordSelector();
407  return SI->getNumArgs();
408}
409
410IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const {
411  if (getIdentifierInfoFlag() < MultiArg) {
412    assert(argIndex == 0 && "illegal keyword index");
413    return getAsIdentifierInfo();
414  }
415  // We point to a MultiKeywordSelector.
416  MultiKeywordSelector *SI = getMultiKeywordSelector();
417  return SI->getIdentifierInfoForSlot(argIndex);
418}
419
420StringRef Selector::getNameForSlot(unsigned int argIndex) const {
421  IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
422  return II? II->getName() : StringRef();
423}
424
425std::string MultiKeywordSelector::getName() const {
426  SmallString<256> Str;
427  llvm::raw_svector_ostream OS(Str);
428  for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
429    if (*I)
430      OS << (*I)->getName();
431    OS << ':';
432  }
433
434  return OS.str();
435}
436
437std::string Selector::getAsString() const {
438  if (InfoPtr == 0)
439    return "<null selector>";
440
441  if (getIdentifierInfoFlag() < MultiArg) {
442    IdentifierInfo *II = getAsIdentifierInfo();
443
444    // If the number of arguments is 0 then II is guaranteed to not be null.
445    if (getNumArgs() == 0)
446      return II->getName();
447
448    if (!II)
449      return ":";
450
451    return II->getName().str() + ":";
452  }
453
454  // We have a multiple keyword selector.
455  return getMultiKeywordSelector()->getName();
456}
457
458void Selector::print(llvm::raw_ostream &OS) const {
459  OS << getAsString();
460}
461
462/// Interpreting the given string using the normal CamelCase
463/// conventions, determine whether the given string starts with the
464/// given "word", which is assumed to end in a lowercase letter.
465static bool startsWithWord(StringRef name, StringRef word) {
466  if (name.size() < word.size()) return false;
467  return ((name.size() == word.size() || !isLowercase(name[word.size()])) &&
468          name.startswith(word));
469}
470
471ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) {
472  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
473  if (!first) return OMF_None;
474
475  StringRef name = first->getName();
476  if (sel.isUnarySelector()) {
477    if (name == "autorelease") return OMF_autorelease;
478    if (name == "dealloc") return OMF_dealloc;
479    if (name == "finalize") return OMF_finalize;
480    if (name == "release") return OMF_release;
481    if (name == "retain") return OMF_retain;
482    if (name == "retainCount") return OMF_retainCount;
483    if (name == "self") return OMF_self;
484    if (name == "initialize") return OMF_initialize;
485  }
486
487  if (name == "performSelector") return OMF_performSelector;
488
489  // The other method families may begin with a prefix of underscores.
490  while (!name.empty() && name.front() == '_')
491    name = name.substr(1);
492
493  if (name.empty()) return OMF_None;
494  switch (name.front()) {
495  case 'a':
496    if (startsWithWord(name, "alloc")) return OMF_alloc;
497    break;
498  case 'c':
499    if (startsWithWord(name, "copy")) return OMF_copy;
500    break;
501  case 'i':
502    if (startsWithWord(name, "init")) return OMF_init;
503    break;
504  case 'm':
505    if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy;
506    break;
507  case 'n':
508    if (startsWithWord(name, "new")) return OMF_new;
509    break;
510  default:
511    break;
512  }
513
514  return OMF_None;
515}
516
517ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) {
518  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
519  if (!first) return OIT_None;
520
521  StringRef name = first->getName();
522
523  if (name.empty()) return OIT_None;
524  switch (name.front()) {
525    case 'a':
526      if (startsWithWord(name, "array")) return OIT_Array;
527      break;
528    case 'd':
529      if (startsWithWord(name, "default")) return OIT_ReturnsSelf;
530      if (startsWithWord(name, "dictionary")) return OIT_Dictionary;
531      break;
532    case 's':
533      if (startsWithWord(name, "shared")) return OIT_ReturnsSelf;
534      if (startsWithWord(name, "standard")) return OIT_Singleton;
535    case 'i':
536      if (startsWithWord(name, "init")) return OIT_Init;
537    default:
538      break;
539  }
540  return OIT_None;
541}
542
543ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) {
544  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
545  if (!first) return SFF_None;
546
547  StringRef name = first->getName();
548
549  switch (name.front()) {
550    case 'a':
551      if (name == "appendFormat") return SFF_NSString;
552      break;
553
554    case 'i':
555      if (name == "initWithFormat") return SFF_NSString;
556      break;
557
558    case 'l':
559      if (name == "localizedStringWithFormat") return SFF_NSString;
560      break;
561
562    case 's':
563      if (name == "stringByAppendingFormat" ||
564          name == "stringWithFormat") return SFF_NSString;
565      break;
566  }
567  return SFF_None;
568}
569
570namespace {
571  struct SelectorTableImpl {
572    llvm::FoldingSet<MultiKeywordSelector> Table;
573    llvm::BumpPtrAllocator Allocator;
574  };
575} // end anonymous namespace.
576
577static SelectorTableImpl &getSelectorTableImpl(void *P) {
578  return *static_cast<SelectorTableImpl*>(P);
579}
580
581SmallString<64>
582SelectorTable::constructSetterName(StringRef Name) {
583  SmallString<64> SetterName("set");
584  SetterName += Name;
585  SetterName[3] = toUppercase(SetterName[3]);
586  return SetterName;
587}
588
589Selector
590SelectorTable::constructSetterSelector(IdentifierTable &Idents,
591                                       SelectorTable &SelTable,
592                                       const IdentifierInfo *Name) {
593  IdentifierInfo *SetterName =
594    &Idents.get(constructSetterName(Name->getName()));
595  return SelTable.getUnarySelector(SetterName);
596}
597
598size_t SelectorTable::getTotalMemory() const {
599  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
600  return SelTabImpl.Allocator.getTotalMemory();
601}
602
603Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) {
604  if (nKeys < 2)
605    return Selector(IIV[0], nKeys);
606
607  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
608
609  // Unique selector, to guarantee there is one per name.
610  llvm::FoldingSetNodeID ID;
611  MultiKeywordSelector::Profile(ID, IIV, nKeys);
612
613  void *InsertPos = nullptr;
614  if (MultiKeywordSelector *SI =
615        SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos))
616    return Selector(SI);
617
618  // MultiKeywordSelector objects are not allocated with new because they have a
619  // variable size array (for parameter types) at the end of them.
620  unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *);
621  MultiKeywordSelector *SI =
622    (MultiKeywordSelector*)SelTabImpl.Allocator.Allocate(Size,
623                                         llvm::alignOf<MultiKeywordSelector>());
624  new (SI) MultiKeywordSelector(nKeys, IIV);
625  SelTabImpl.Table.InsertNode(SI, InsertPos);
626  return Selector(SI);
627}
628
629SelectorTable::SelectorTable() {
630  Impl = new SelectorTableImpl();
631}
632
633SelectorTable::~SelectorTable() {
634  delete &getSelectorTableImpl(Impl);
635}
636
637const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) {
638  switch (Operator) {
639  case OO_None:
640  case NUM_OVERLOADED_OPERATORS:
641    return nullptr;
642
643#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
644  case OO_##Name: return Spelling;
645#include "clang/Basic/OperatorKinds.def"
646  }
647
648  llvm_unreachable("Invalid OverloadedOperatorKind!");
649}
650
651StringRef clang::getNullabilitySpelling(NullabilityKind kind,
652                                        bool isContextSensitive) {
653  switch (kind) {
654  case NullabilityKind::NonNull:
655    return isContextSensitive ? "nonnull" : "_Nonnull";
656
657  case NullabilityKind::Nullable:
658    return isContextSensitive ? "nullable" : "_Nullable";
659
660  case NullabilityKind::Unspecified:
661    return isContextSensitive ? "null_unspecified" : "_Null_unspecified";
662  }
663  llvm_unreachable("Unknown nullability kind.");
664}
665