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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 
27 using namespace clang;
28 
29 //===----------------------------------------------------------------------===//
30 // IdentifierInfo Implementation
31 //===----------------------------------------------------------------------===//
32 
IdentifierInfo()33 IdentifierInfo::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 
~IdentifierIterator()57 IdentifierIterator::~IdentifierIterator() { }
58 
~IdentifierInfoLookup()59 IdentifierInfoLookup::~IdentifierInfoLookup() {}
60 
61 namespace {
62   /// \brief A simple identifier lookup iterator that represents an
63   /// empty sequence of identifiers.
64   class EmptyLookupIterator : public IdentifierIterator
65   {
66   public:
Next()67     StringRef Next() override { return StringRef(); }
68   };
69 }
70 
getIdentifiers()71 IdentifierIterator *IdentifierInfoLookup::getIdentifiers() {
72   return new EmptyLookupIterator();
73 }
74 
IdentifierTable(const LangOptions & LangOpts,IdentifierInfoLookup * externalLookup)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     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.
getKeywordStatus(const LangOptions & LangOpts,unsigned Flags)131 static 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.
AddKeyword(StringRef Keyword,tok::TokenKind TokenCode,unsigned Flags,const LangOptions & LangOpts,IdentifierTable & Table)160 static 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.
AddCXXOperatorKeyword(StringRef Keyword,tok::TokenKind TokenCode,IdentifierTable & Table)185 static 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".
AddObjCKeyword(StringRef Name,tok::ObjCKeywordKind ObjCID,IdentifierTable & Table)194 static 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 ///
AddKeywords(const LangOptions & LangOpts)202 void 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.
getTokenKwStatus(const LangOptions & LangOpts,tok::TokenKind K)233 static 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.
isKeyword(const LangOptions & LangOpts)245 bool 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 
getPPKeywordID() const255 tok::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.
PrintStats() const312 void 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 
getHashValue(clang::Selector S)345 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
346   return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
347 }
348 
349 namespace 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.
354 class MultiKeywordSelector
355   : public DeclarationNameExtra, public llvm::FoldingSetNode {
MultiKeywordSelector(unsigned nKeys)356   MultiKeywordSelector(unsigned nKeys) {
357     ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
358   }
359 public:
360   // Constructor for keyword selectors.
MultiKeywordSelector(unsigned nKeys,IdentifierInfo ** IIV)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 
getNumArgs() const374   unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; }
375 
376   typedef IdentifierInfo *const *keyword_iterator;
keyword_begin() const377   keyword_iterator keyword_begin() const {
378     return reinterpret_cast<keyword_iterator>(this+1);
379   }
keyword_end() const380   keyword_iterator keyword_end() const {
381     return keyword_begin()+getNumArgs();
382   }
getIdentifierInfoForSlot(unsigned i) const383   IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
384     assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
385     return keyword_begin()[i];
386   }
Profile(llvm::FoldingSetNodeID & ID,keyword_iterator ArgTys,unsigned NumArgs)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   }
Profile(llvm::FoldingSetNodeID & ID)393   void Profile(llvm::FoldingSetNodeID &ID) {
394     Profile(ID, keyword_begin(), getNumArgs());
395   }
396 };
397 } // end namespace clang.
398 
getNumArgs() const399 unsigned 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 
getIdentifierInfoForSlot(unsigned argIndex) const410 IdentifierInfo *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 
getNameForSlot(unsigned int argIndex) const420 StringRef Selector::getNameForSlot(unsigned int argIndex) const {
421   IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
422   return II? II->getName() : StringRef();
423 }
424 
getName() const425 std::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 
getAsString() const437 std::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 
print(llvm::raw_ostream & OS) const458 void 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.
startsWithWord(StringRef name,StringRef word)465 static 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 
getMethodFamilyImpl(Selector sel)471 ObjCMethodFamily 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 
getInstTypeMethodFamily(Selector sel)517 ObjCInstanceTypeFamily 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 
getStringFormatFamilyImpl(Selector sel)543 ObjCStringFormatFamily 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 
570 namespace {
571   struct SelectorTableImpl {
572     llvm::FoldingSet<MultiKeywordSelector> Table;
573     llvm::BumpPtrAllocator Allocator;
574   };
575 } // end anonymous namespace.
576 
getSelectorTableImpl(void * P)577 static SelectorTableImpl &getSelectorTableImpl(void *P) {
578   return *static_cast<SelectorTableImpl*>(P);
579 }
580 
581 SmallString<64>
constructSetterName(StringRef Name)582 SelectorTable::constructSetterName(StringRef Name) {
583   SmallString<64> SetterName("set");
584   SetterName += Name;
585   SetterName[3] = toUppercase(SetterName[3]);
586   return SetterName;
587 }
588 
589 Selector
constructSetterSelector(IdentifierTable & Idents,SelectorTable & SelTable,const IdentifierInfo * Name)590 SelectorTable::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 
getTotalMemory() const598 size_t SelectorTable::getTotalMemory() const {
599   SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
600   return SelTabImpl.Allocator.getTotalMemory();
601 }
602 
getSelector(unsigned nKeys,IdentifierInfo ** IIV)603 Selector 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 
SelectorTable()629 SelectorTable::SelectorTable() {
630   Impl = new SelectorTableImpl();
631 }
632 
~SelectorTable()633 SelectorTable::~SelectorTable() {
634   delete &getSelectorTableImpl(Impl);
635 }
636 
getOperatorSpelling(OverloadedOperatorKind Operator)637 const 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 
getNullabilitySpelling(NullabilityKind kind,bool isContextSensitive)651 StringRef 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