1//===- IdentifierTable.cpp - Hash table for identifier lookup -------------===//
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 implements the IdentifierInfo, IdentifierVisitor, and
10// IdentifierTable interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Basic/IdentifierTable.h"
15#include "clang/Basic/CharInfo.h"
16#include "clang/Basic/LangOptions.h"
17#include "clang/Basic/OperatorKinds.h"
18#include "clang/Basic/Specifiers.h"
19#include "clang/Basic/TargetBuiltins.h"
20#include "clang/Basic/TokenKinds.h"
21#include "llvm/ADT/DenseMapInfo.h"
22#include "llvm/ADT/FoldingSet.h"
23#include "llvm/ADT/SmallString.h"
24#include "llvm/ADT/StringMap.h"
25#include "llvm/ADT/StringRef.h"
26#include "llvm/Support/Allocator.h"
27#include "llvm/Support/ErrorHandling.h"
28#include "llvm/Support/raw_ostream.h"
29#include <cassert>
30#include <cstdio>
31#include <cstring>
32#include <string>
33
34using namespace clang;
35
36// A check to make sure the ObjCOrBuiltinID has sufficient room to store the
37// largest possible target/aux-target combination. If we exceed this, we likely
38// need to just change the ObjCOrBuiltinIDBits value in IdentifierTable.h.
39static_assert(2 * LargestBuiltinID < (2 << (ObjCOrBuiltinIDBits - 1)),
40              "Insufficient ObjCOrBuiltinID Bits");
41
42//===----------------------------------------------------------------------===//
43// IdentifierTable Implementation
44//===----------------------------------------------------------------------===//
45
46IdentifierIterator::~IdentifierIterator() = default;
47
48IdentifierInfoLookup::~IdentifierInfoLookup() = default;
49
50namespace {
51
52/// A simple identifier lookup iterator that represents an
53/// empty sequence of identifiers.
54class EmptyLookupIterator : public IdentifierIterator
55{
56public:
57  StringRef Next() override { return StringRef(); }
58};
59
60} // namespace
61
62IdentifierIterator *IdentifierInfoLookup::getIdentifiers() {
63  return new EmptyLookupIterator();
64}
65
66IdentifierTable::IdentifierTable(IdentifierInfoLookup *ExternalLookup)
67    : HashTable(8192), // Start with space for 8K identifiers.
68      ExternalLookup(ExternalLookup) {}
69
70IdentifierTable::IdentifierTable(const LangOptions &LangOpts,
71                                 IdentifierInfoLookup *ExternalLookup)
72    : IdentifierTable(ExternalLookup) {
73  // Populate the identifier table with info about keywords for the current
74  // language.
75  AddKeywords(LangOpts);
76}
77
78//===----------------------------------------------------------------------===//
79// Language Keyword Implementation
80//===----------------------------------------------------------------------===//
81
82// Constants for TokenKinds.def
83namespace {
84
85  enum {
86    KEYC99        = 0x1,
87    KEYCXX        = 0x2,
88    KEYCXX11      = 0x4,
89    KEYGNU        = 0x8,
90    KEYMS         = 0x10,
91    BOOLSUPPORT   = 0x20,
92    KEYALTIVEC    = 0x40,
93    KEYNOCXX      = 0x80,
94    KEYBORLAND    = 0x100,
95    KEYOPENCLC    = 0x200,
96    KEYC11        = 0x400,
97    KEYNOMS18     = 0x800,
98    KEYNOOPENCL   = 0x1000,
99    WCHARSUPPORT  = 0x2000,
100    HALFSUPPORT   = 0x4000,
101    CHAR8SUPPORT  = 0x8000,
102    KEYCONCEPTS   = 0x10000,
103    KEYOBJC       = 0x20000,
104    KEYZVECTOR    = 0x40000,
105    KEYCOROUTINES = 0x80000,
106    KEYMODULES    = 0x100000,
107    KEYCXX20      = 0x200000,
108    KEYOPENCLCXX  = 0x400000,
109    KEYMSCOMPAT   = 0x800000,
110    KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX20,
111    KEYALL = (0xffffff & ~KEYNOMS18 &
112              ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
113  };
114
115  /// How a keyword is treated in the selected standard.
116  enum KeywordStatus {
117    KS_Disabled,    // Disabled
118    KS_Extension,   // Is an extension
119    KS_Enabled,     // Enabled
120    KS_Future       // Is a keyword in future standard
121  };
122
123} // namespace
124
125/// Translates flags as specified in TokenKinds.def into keyword status
126/// in the given language standard.
127static KeywordStatus getKeywordStatus(const LangOptions &LangOpts,
128                                      unsigned Flags) {
129  if (Flags == KEYALL) return KS_Enabled;
130  if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled;
131  if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled;
132  if (LangOpts.CPlusPlus20 && (Flags & KEYCXX20)) return KS_Enabled;
133  if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled;
134  if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension;
135  if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension;
136  if (LangOpts.MSVCCompat && (Flags & KEYMSCOMPAT)) return KS_Enabled;
137  if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension;
138  if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled;
139  if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled;
140  if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled;
141  if (LangOpts.Char8 && (Flags & CHAR8SUPPORT)) return KS_Enabled;
142  if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled;
143  if (LangOpts.ZVector && (Flags & KEYZVECTOR)) return KS_Enabled;
144  if (LangOpts.OpenCL && !LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLC))
145    return KS_Enabled;
146  if (LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLCXX)) return KS_Enabled;
147  if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled;
148  if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled;
149  // We treat bridge casts as objective-C keywords so we can warn on them
150  // in non-arc mode.
151  if (LangOpts.ObjC && (Flags & KEYOBJC)) return KS_Enabled;
152  if (LangOpts.CPlusPlus20 && (Flags & KEYCONCEPTS)) return KS_Enabled;
153  if (LangOpts.Coroutines && (Flags & KEYCOROUTINES)) return KS_Enabled;
154  if (LangOpts.ModulesTS && (Flags & KEYMODULES)) return KS_Enabled;
155  if (LangOpts.CPlusPlus && (Flags & KEYALLCXX)) return KS_Future;
156  if (LangOpts.CPlusPlus && !LangOpts.CPlusPlus20 && (Flags & CHAR8SUPPORT))
157    return KS_Future;
158  return KS_Disabled;
159}
160
161/// AddKeyword - This method is used to associate a token ID with specific
162/// identifiers because they are language keywords.  This causes the lexer to
163/// automatically map matching identifiers to specialized token codes.
164static void AddKeyword(StringRef Keyword,
165                       tok::TokenKind TokenCode, unsigned Flags,
166                       const LangOptions &LangOpts, IdentifierTable &Table) {
167  KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags);
168
169  // Don't add this keyword under MSVCCompat.
170  if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) &&
171      !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015))
172    return;
173
174  // Don't add this keyword under OpenCL.
175  if (LangOpts.OpenCL && (Flags & KEYNOOPENCL))
176    return;
177
178  // Don't add this keyword if disabled in this language.
179  if (AddResult == KS_Disabled) return;
180
181  IdentifierInfo &Info =
182      Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode);
183  Info.setIsExtensionToken(AddResult == KS_Extension);
184  Info.setIsFutureCompatKeyword(AddResult == KS_Future);
185}
186
187/// AddCXXOperatorKeyword - Register a C++ operator keyword alternative
188/// representations.
189static void AddCXXOperatorKeyword(StringRef Keyword,
190                                  tok::TokenKind TokenCode,
191                                  IdentifierTable &Table) {
192  IdentifierInfo &Info = Table.get(Keyword, TokenCode);
193  Info.setIsCPlusPlusOperatorKeyword();
194}
195
196/// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector"
197/// or "property".
198static void AddObjCKeyword(StringRef Name,
199                           tok::ObjCKeywordKind ObjCID,
200                           IdentifierTable &Table) {
201  Table.get(Name).setObjCKeywordID(ObjCID);
202}
203
204/// AddKeywords - Add all keywords to the symbol table.
205///
206void IdentifierTable::AddKeywords(const LangOptions &LangOpts) {
207  // Add keywords and tokens for the current language.
208#define KEYWORD(NAME, FLAGS) \
209  AddKeyword(StringRef(#NAME), tok::kw_ ## NAME,  \
210             FLAGS, LangOpts, *this);
211#define ALIAS(NAME, TOK, FLAGS) \
212  AddKeyword(StringRef(NAME), tok::kw_ ## TOK,  \
213             FLAGS, LangOpts, *this);
214#define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \
215  if (LangOpts.CXXOperatorNames)          \
216    AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this);
217#define OBJC_AT_KEYWORD(NAME)  \
218  if (LangOpts.ObjC)           \
219    AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
220#define TESTING_KEYWORD(NAME, FLAGS)
221#include "clang/Basic/TokenKinds.def"
222
223  if (LangOpts.ParseUnknownAnytype)
224    AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL,
225               LangOpts, *this);
226
227  if (LangOpts.DeclSpecKeyword)
228    AddKeyword("__declspec", tok::kw___declspec, KEYALL, LangOpts, *this);
229
230  // Add the 'import' contextual keyword.
231  get("import").setModulesImport(true);
232}
233
234/// Checks if the specified token kind represents a keyword in the
235/// specified language.
236/// \returns Status of the keyword in the language.
237static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts,
238                                      tok::TokenKind K) {
239  switch (K) {
240#define KEYWORD(NAME, FLAGS) \
241  case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS);
242#include "clang/Basic/TokenKinds.def"
243  default: return KS_Disabled;
244  }
245}
246
247/// Returns true if the identifier represents a keyword in the
248/// specified language.
249bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) const {
250  switch (getTokenKwStatus(LangOpts, getTokenID())) {
251  case KS_Enabled:
252  case KS_Extension:
253    return true;
254  default:
255    return false;
256  }
257}
258
259/// Returns true if the identifier represents a C++ keyword in the
260/// specified language.
261bool IdentifierInfo::isCPlusPlusKeyword(const LangOptions &LangOpts) const {
262  if (!LangOpts.CPlusPlus || !isKeyword(LangOpts))
263    return false;
264  // This is a C++ keyword if this identifier is not a keyword when checked
265  // using LangOptions without C++ support.
266  LangOptions LangOptsNoCPP = LangOpts;
267  LangOptsNoCPP.CPlusPlus = false;
268  LangOptsNoCPP.CPlusPlus11 = false;
269  LangOptsNoCPP.CPlusPlus20 = false;
270  return !isKeyword(LangOptsNoCPP);
271}
272
273tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
274  // We use a perfect hash function here involving the length of the keyword,
275  // the first and third character.  For preprocessor ID's there are no
276  // collisions (if there were, the switch below would complain about duplicate
277  // case values).  Note that this depends on 'if' being null terminated.
278
279#define HASH(LEN, FIRST, THIRD) \
280  (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31)
281#define CASE(LEN, FIRST, THIRD, NAME) \
282  case HASH(LEN, FIRST, THIRD): \
283    return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME
284
285  unsigned Len = getLength();
286  if (Len < 2) return tok::pp_not_keyword;
287  const char *Name = getNameStart();
288  switch (HASH(Len, Name[0], Name[2])) {
289  default: return tok::pp_not_keyword;
290  CASE( 2, 'i', '\0', if);
291  CASE( 4, 'e', 'i', elif);
292  CASE( 4, 'e', 's', else);
293  CASE( 4, 'l', 'n', line);
294  CASE( 4, 's', 'c', sccs);
295  CASE( 5, 'e', 'd', endif);
296  CASE( 5, 'e', 'r', error);
297  CASE( 5, 'i', 'e', ident);
298  CASE( 5, 'i', 'd', ifdef);
299  CASE( 5, 'u', 'd', undef);
300
301  CASE( 6, 'a', 's', assert);
302  CASE( 6, 'd', 'f', define);
303  CASE( 6, 'i', 'n', ifndef);
304  CASE( 6, 'i', 'p', import);
305  CASE( 6, 'p', 'a', pragma);
306
307  CASE( 7, 'd', 'f', defined);
308  CASE( 7, 'i', 'c', include);
309  CASE( 7, 'w', 'r', warning);
310
311  CASE( 8, 'u', 'a', unassert);
312  CASE(12, 'i', 'c', include_next);
313
314  CASE(14, '_', 'p', __public_macro);
315
316  CASE(15, '_', 'p', __private_macro);
317
318  CASE(16, '_', 'i', __include_macros);
319#undef CASE
320#undef HASH
321  }
322}
323
324//===----------------------------------------------------------------------===//
325// Stats Implementation
326//===----------------------------------------------------------------------===//
327
328/// PrintStats - Print statistics about how well the identifier table is doing
329/// at hashing identifiers.
330void IdentifierTable::PrintStats() const {
331  unsigned NumBuckets = HashTable.getNumBuckets();
332  unsigned NumIdentifiers = HashTable.getNumItems();
333  unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers;
334  unsigned AverageIdentifierSize = 0;
335  unsigned MaxIdentifierLength = 0;
336
337  // TODO: Figure out maximum times an identifier had to probe for -stats.
338  for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator
339       I = HashTable.begin(), E = HashTable.end(); I != E; ++I) {
340    unsigned IdLen = I->getKeyLength();
341    AverageIdentifierSize += IdLen;
342    if (MaxIdentifierLength < IdLen)
343      MaxIdentifierLength = IdLen;
344  }
345
346  fprintf(stderr, "\n*** Identifier Table Stats:\n");
347  fprintf(stderr, "# Identifiers:   %d\n", NumIdentifiers);
348  fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets);
349  fprintf(stderr, "Hash density (#identifiers per bucket): %f\n",
350          NumIdentifiers/(double)NumBuckets);
351  fprintf(stderr, "Ave identifier length: %f\n",
352          (AverageIdentifierSize/(double)NumIdentifiers));
353  fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength);
354
355  // Compute statistics about the memory allocated for identifiers.
356  HashTable.getAllocator().PrintStats();
357}
358
359//===----------------------------------------------------------------------===//
360// SelectorTable Implementation
361//===----------------------------------------------------------------------===//
362
363unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
364  return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
365}
366
367namespace clang {
368
369/// One of these variable length records is kept for each
370/// selector containing more than one keyword. We use a folding set
371/// to unique aggregate names (keyword selectors in ObjC parlance). Access to
372/// this class is provided strictly through Selector.
373class alignas(IdentifierInfoAlignment) MultiKeywordSelector
374    : public detail::DeclarationNameExtra,
375      public llvm::FoldingSetNode {
376  MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {}
377
378public:
379  // Constructor for keyword selectors.
380  MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV)
381      : DeclarationNameExtra(nKeys) {
382    assert((nKeys > 1) && "not a multi-keyword selector");
383
384    // Fill in the trailing keyword array.
385    IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1);
386    for (unsigned i = 0; i != nKeys; ++i)
387      KeyInfo[i] = IIV[i];
388  }
389
390  // getName - Derive the full selector name and return it.
391  std::string getName() const;
392
393  using DeclarationNameExtra::getNumArgs;
394
395  using keyword_iterator = IdentifierInfo *const *;
396
397  keyword_iterator keyword_begin() const {
398    return reinterpret_cast<keyword_iterator>(this + 1);
399  }
400
401  keyword_iterator keyword_end() const {
402    return keyword_begin() + getNumArgs();
403  }
404
405  IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
406    assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
407    return keyword_begin()[i];
408  }
409
410  static void Profile(llvm::FoldingSetNodeID &ID, keyword_iterator ArgTys,
411                      unsigned NumArgs) {
412    ID.AddInteger(NumArgs);
413    for (unsigned i = 0; i != NumArgs; ++i)
414      ID.AddPointer(ArgTys[i]);
415  }
416
417  void Profile(llvm::FoldingSetNodeID &ID) {
418    Profile(ID, keyword_begin(), getNumArgs());
419  }
420};
421
422} // namespace clang.
423
424bool Selector::isKeywordSelector(ArrayRef<StringRef> Names) const {
425  assert(!Names.empty() && "must have >= 1 selector slots");
426  if (getNumArgs() != Names.size())
427    return false;
428  for (unsigned I = 0, E = Names.size(); I != E; ++I) {
429    if (getNameForSlot(I) != Names[I])
430      return false;
431  }
432  return true;
433}
434
435bool Selector::isUnarySelector(StringRef Name) const {
436  return isUnarySelector() && getNameForSlot(0) == Name;
437}
438
439unsigned Selector::getNumArgs() const {
440  unsigned IIF = getIdentifierInfoFlag();
441  if (IIF <= ZeroArg)
442    return 0;
443  if (IIF == OneArg)
444    return 1;
445  // We point to a MultiKeywordSelector.
446  MultiKeywordSelector *SI = getMultiKeywordSelector();
447  return SI->getNumArgs();
448}
449
450IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const {
451  if (getIdentifierInfoFlag() < MultiArg) {
452    assert(argIndex == 0 && "illegal keyword index");
453    return getAsIdentifierInfo();
454  }
455
456  // We point to a MultiKeywordSelector.
457  MultiKeywordSelector *SI = getMultiKeywordSelector();
458  return SI->getIdentifierInfoForSlot(argIndex);
459}
460
461StringRef Selector::getNameForSlot(unsigned int argIndex) const {
462  IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
463  return II ? II->getName() : StringRef();
464}
465
466std::string MultiKeywordSelector::getName() const {
467  SmallString<256> Str;
468  llvm::raw_svector_ostream OS(Str);
469  for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
470    if (*I)
471      OS << (*I)->getName();
472    OS << ':';
473  }
474
475  return std::string(OS.str());
476}
477
478std::string Selector::getAsString() const {
479  if (InfoPtr == 0)
480    return "<null selector>";
481
482  if (getIdentifierInfoFlag() < MultiArg) {
483    IdentifierInfo *II = getAsIdentifierInfo();
484
485    if (getNumArgs() == 0) {
486      assert(II && "If the number of arguments is 0 then II is guaranteed to "
487                   "not be null.");
488      return std::string(II->getName());
489    }
490
491    if (!II)
492      return ":";
493
494    return II->getName().str() + ":";
495  }
496
497  // We have a multiple keyword selector.
498  return getMultiKeywordSelector()->getName();
499}
500
501void Selector::print(llvm::raw_ostream &OS) const {
502  OS << getAsString();
503}
504
505LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); }
506
507/// Interpreting the given string using the normal CamelCase
508/// conventions, determine whether the given string starts with the
509/// given "word", which is assumed to end in a lowercase letter.
510static bool startsWithWord(StringRef name, StringRef word) {
511  if (name.size() < word.size()) return false;
512  return ((name.size() == word.size() || !isLowercase(name[word.size()])) &&
513          name.startswith(word));
514}
515
516ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) {
517  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
518  if (!first) return OMF_None;
519
520  StringRef name = first->getName();
521  if (sel.isUnarySelector()) {
522    if (name == "autorelease") return OMF_autorelease;
523    if (name == "dealloc") return OMF_dealloc;
524    if (name == "finalize") return OMF_finalize;
525    if (name == "release") return OMF_release;
526    if (name == "retain") return OMF_retain;
527    if (name == "retainCount") return OMF_retainCount;
528    if (name == "self") return OMF_self;
529    if (name == "initialize") return OMF_initialize;
530  }
531
532  if (name == "performSelector" || name == "performSelectorInBackground" ||
533      name == "performSelectorOnMainThread")
534    return OMF_performSelector;
535
536  // The other method families may begin with a prefix of underscores.
537  while (!name.empty() && name.front() == '_')
538    name = name.substr(1);
539
540  if (name.empty()) return OMF_None;
541  switch (name.front()) {
542  case 'a':
543    if (startsWithWord(name, "alloc")) return OMF_alloc;
544    break;
545  case 'c':
546    if (startsWithWord(name, "copy")) return OMF_copy;
547    break;
548  case 'i':
549    if (startsWithWord(name, "init")) return OMF_init;
550    break;
551  case 'm':
552    if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy;
553    break;
554  case 'n':
555    if (startsWithWord(name, "new")) return OMF_new;
556    break;
557  default:
558    break;
559  }
560
561  return OMF_None;
562}
563
564ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) {
565  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
566  if (!first) return OIT_None;
567
568  StringRef name = first->getName();
569
570  if (name.empty()) return OIT_None;
571  switch (name.front()) {
572    case 'a':
573      if (startsWithWord(name, "array")) return OIT_Array;
574      break;
575    case 'd':
576      if (startsWithWord(name, "default")) return OIT_ReturnsSelf;
577      if (startsWithWord(name, "dictionary")) return OIT_Dictionary;
578      break;
579    case 's':
580      if (startsWithWord(name, "shared")) return OIT_ReturnsSelf;
581      if (startsWithWord(name, "standard")) return OIT_Singleton;
582      break;
583    case 'i':
584      if (startsWithWord(name, "init")) return OIT_Init;
585      break;
586    default:
587      break;
588  }
589  return OIT_None;
590}
591
592ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) {
593  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
594  if (!first) return SFF_None;
595
596  StringRef name = first->getName();
597
598  switch (name.front()) {
599    case 'a':
600      if (name == "appendFormat") return SFF_NSString;
601      break;
602
603    case 'i':
604      if (name == "initWithFormat") return SFF_NSString;
605      break;
606
607    case 'l':
608      if (name == "localizedStringWithFormat") return SFF_NSString;
609      break;
610
611    case 's':
612      if (name == "stringByAppendingFormat" ||
613          name == "stringWithFormat") return SFF_NSString;
614      break;
615  }
616  return SFF_None;
617}
618
619namespace {
620
621struct SelectorTableImpl {
622  llvm::FoldingSet<MultiKeywordSelector> Table;
623  llvm::BumpPtrAllocator Allocator;
624};
625
626} // namespace
627
628static SelectorTableImpl &getSelectorTableImpl(void *P) {
629  return *static_cast<SelectorTableImpl*>(P);
630}
631
632SmallString<64>
633SelectorTable::constructSetterName(StringRef Name) {
634  SmallString<64> SetterName("set");
635  SetterName += Name;
636  SetterName[3] = toUppercase(SetterName[3]);
637  return SetterName;
638}
639
640Selector
641SelectorTable::constructSetterSelector(IdentifierTable &Idents,
642                                       SelectorTable &SelTable,
643                                       const IdentifierInfo *Name) {
644  IdentifierInfo *SetterName =
645    &Idents.get(constructSetterName(Name->getName()));
646  return SelTable.getUnarySelector(SetterName);
647}
648
649std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) {
650  StringRef Name = Sel.getNameForSlot(0);
651  assert(Name.startswith("set") && "invalid setter name");
652  return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str();
653}
654
655size_t SelectorTable::getTotalMemory() const {
656  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
657  return SelTabImpl.Allocator.getTotalMemory();
658}
659
660Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) {
661  if (nKeys < 2)
662    return Selector(IIV[0], nKeys);
663
664  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
665
666  // Unique selector, to guarantee there is one per name.
667  llvm::FoldingSetNodeID ID;
668  MultiKeywordSelector::Profile(ID, IIV, nKeys);
669
670  void *InsertPos = nullptr;
671  if (MultiKeywordSelector *SI =
672        SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos))
673    return Selector(SI);
674
675  // MultiKeywordSelector objects are not allocated with new because they have a
676  // variable size array (for parameter types) at the end of them.
677  unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *);
678  MultiKeywordSelector *SI =
679      (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate(
680          Size, alignof(MultiKeywordSelector));
681  new (SI) MultiKeywordSelector(nKeys, IIV);
682  SelTabImpl.Table.InsertNode(SI, InsertPos);
683  return Selector(SI);
684}
685
686SelectorTable::SelectorTable() {
687  Impl = new SelectorTableImpl();
688}
689
690SelectorTable::~SelectorTable() {
691  delete &getSelectorTableImpl(Impl);
692}
693
694const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) {
695  switch (Operator) {
696  case OO_None:
697  case NUM_OVERLOADED_OPERATORS:
698    return nullptr;
699
700#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
701  case OO_##Name: return Spelling;
702#include "clang/Basic/OperatorKinds.def"
703  }
704
705  llvm_unreachable("Invalid OverloadedOperatorKind!");
706}
707
708StringRef clang::getNullabilitySpelling(NullabilityKind kind,
709                                        bool isContextSensitive) {
710  switch (kind) {
711  case NullabilityKind::NonNull:
712    return isContextSensitive ? "nonnull" : "_Nonnull";
713
714  case NullabilityKind::Nullable:
715    return isContextSensitive ? "nullable" : "_Nullable";
716
717  case NullabilityKind::Unspecified:
718    return isContextSensitive ? "null_unspecified" : "_Null_unspecified";
719  }
720  llvm_unreachable("Unknown nullability kind.");
721}
722