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/IdentifierTable.h" 16 #include "clang/Basic/CharInfo.h" 17 #include "clang/Basic/LangOptions.h" 18 #include "clang/Basic/OperatorKinds.h" 19 #include "clang/Basic/Specifiers.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 34 using namespace clang; 35 36 //===----------------------------------------------------------------------===// 37 // IdentifierInfo Implementation 38 //===----------------------------------------------------------------------===// 39 40 IdentifierInfo::IdentifierInfo() { 41 TokenID = tok::identifier; 42 ObjCOrBuiltinID = 0; 43 HasMacro = false; 44 HadMacro = false; 45 IsExtension = false; 46 IsFutureCompatKeyword = false; 47 IsPoisoned = false; 48 IsCPPOperatorKeyword = false; 49 NeedsHandleIdentifier = false; 50 IsFromAST = false; 51 ChangedAfterLoad = false; 52 FEChangedAfterLoad = false; 53 RevertedTokenID = false; 54 OutOfDate = false; 55 IsModulesImport = false; 56 } 57 58 //===----------------------------------------------------------------------===// 59 // IdentifierTable Implementation 60 //===----------------------------------------------------------------------===// 61 62 IdentifierIterator::~IdentifierIterator() = default; 63 64 IdentifierInfoLookup::~IdentifierInfoLookup() = default; 65 66 namespace { 67 68 /// A simple identifier lookup iterator that represents an 69 /// empty sequence of identifiers. 70 class EmptyLookupIterator : public IdentifierIterator 71 { 72 public: 73 StringRef Next() override { return StringRef(); } 74 }; 75 76 } // namespace 77 78 IdentifierIterator *IdentifierInfoLookup::getIdentifiers() { 79 return new EmptyLookupIterator(); 80 } 81 82 IdentifierTable::IdentifierTable(IdentifierInfoLookup *ExternalLookup) 83 : HashTable(8192), // Start with space for 8K identifiers. 84 ExternalLookup(ExternalLookup) {} 85 86 IdentifierTable::IdentifierTable(const LangOptions &LangOpts, 87 IdentifierInfoLookup *ExternalLookup) 88 : IdentifierTable(ExternalLookup) { 89 // Populate the identifier table with info about keywords for the current 90 // language. 91 AddKeywords(LangOpts); 92 } 93 94 //===----------------------------------------------------------------------===// 95 // Language Keyword Implementation 96 //===----------------------------------------------------------------------===// 97 98 // Constants for TokenKinds.def 99 namespace { 100 101 enum { 102 KEYC99 = 0x1, 103 KEYCXX = 0x2, 104 KEYCXX11 = 0x4, 105 KEYGNU = 0x8, 106 KEYMS = 0x10, 107 BOOLSUPPORT = 0x20, 108 KEYALTIVEC = 0x40, 109 KEYNOCXX = 0x80, 110 KEYBORLAND = 0x100, 111 KEYOPENCLC = 0x200, 112 KEYC11 = 0x400, 113 KEYARC = 0x800, 114 KEYNOMS18 = 0x01000, 115 KEYNOOPENCL = 0x02000, 116 WCHARSUPPORT = 0x04000, 117 HALFSUPPORT = 0x08000, 118 CHAR8SUPPORT = 0x10000, 119 KEYCONCEPTS = 0x20000, 120 KEYOBJC2 = 0x40000, 121 KEYZVECTOR = 0x80000, 122 KEYCOROUTINES = 0x100000, 123 KEYMODULES = 0x200000, 124 KEYCXX2A = 0x400000, 125 KEYOPENCLCXX = 0x800000, 126 KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX2A, 127 KEYALL = (0xffffff & ~KEYNOMS18 & 128 ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude. 129 }; 130 131 /// How a keyword is treated in the selected standard. 132 enum KeywordStatus { 133 KS_Disabled, // Disabled 134 KS_Extension, // Is an extension 135 KS_Enabled, // Enabled 136 KS_Future // Is a keyword in future standard 137 }; 138 139 } // namespace 140 141 /// Translates flags as specified in TokenKinds.def into keyword status 142 /// in the given language standard. 143 static KeywordStatus getKeywordStatus(const LangOptions &LangOpts, 144 unsigned Flags) { 145 if (Flags == KEYALL) return KS_Enabled; 146 if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled; 147 if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled; 148 if (LangOpts.CPlusPlus2a && (Flags & KEYCXX2A)) return KS_Enabled; 149 if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled; 150 if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension; 151 if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension; 152 if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension; 153 if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled; 154 if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled; 155 if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled; 156 if (LangOpts.Char8 && (Flags & CHAR8SUPPORT)) return KS_Enabled; 157 if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled; 158 if (LangOpts.OpenCL && !LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLC)) 159 return KS_Enabled; 160 if (LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLCXX)) return KS_Enabled; 161 if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled; 162 if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled; 163 // We treat bridge casts as objective-C keywords so we can warn on them 164 // in non-arc mode. 165 if (LangOpts.ObjC2 && (Flags & KEYARC)) return KS_Enabled; 166 if (LangOpts.ObjC2 && (Flags & KEYOBJC2)) return KS_Enabled; 167 if (LangOpts.ConceptsTS && (Flags & KEYCONCEPTS)) return KS_Enabled; 168 if (LangOpts.CoroutinesTS && (Flags & KEYCOROUTINES)) return KS_Enabled; 169 if (LangOpts.ModulesTS && (Flags & KEYMODULES)) return KS_Enabled; 170 if (LangOpts.CPlusPlus && (Flags & KEYALLCXX)) return KS_Future; 171 return KS_Disabled; 172 } 173 174 /// AddKeyword - This method is used to associate a token ID with specific 175 /// identifiers because they are language keywords. This causes the lexer to 176 /// automatically map matching identifiers to specialized token codes. 177 static void AddKeyword(StringRef Keyword, 178 tok::TokenKind TokenCode, unsigned Flags, 179 const LangOptions &LangOpts, IdentifierTable &Table) { 180 KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags); 181 182 // Don't add this keyword under MSVCCompat. 183 if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) && 184 !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015)) 185 return; 186 187 // Don't add this keyword under OpenCL. 188 if (LangOpts.OpenCL && (Flags & KEYNOOPENCL)) 189 return; 190 191 // Don't add this keyword if disabled in this language. 192 if (AddResult == KS_Disabled) return; 193 194 IdentifierInfo &Info = 195 Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode); 196 Info.setIsExtensionToken(AddResult == KS_Extension); 197 Info.setIsFutureCompatKeyword(AddResult == KS_Future); 198 } 199 200 /// AddCXXOperatorKeyword - Register a C++ operator keyword alternative 201 /// representations. 202 static void AddCXXOperatorKeyword(StringRef Keyword, 203 tok::TokenKind TokenCode, 204 IdentifierTable &Table) { 205 IdentifierInfo &Info = Table.get(Keyword, TokenCode); 206 Info.setIsCPlusPlusOperatorKeyword(); 207 } 208 209 /// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector" 210 /// or "property". 211 static void AddObjCKeyword(StringRef Name, 212 tok::ObjCKeywordKind ObjCID, 213 IdentifierTable &Table) { 214 Table.get(Name).setObjCKeywordID(ObjCID); 215 } 216 217 /// AddKeywords - Add all keywords to the symbol table. 218 /// 219 void IdentifierTable::AddKeywords(const LangOptions &LangOpts) { 220 // Add keywords and tokens for the current language. 221 #define KEYWORD(NAME, FLAGS) \ 222 AddKeyword(StringRef(#NAME), tok::kw_ ## NAME, \ 223 FLAGS, LangOpts, *this); 224 #define ALIAS(NAME, TOK, FLAGS) \ 225 AddKeyword(StringRef(NAME), tok::kw_ ## TOK, \ 226 FLAGS, LangOpts, *this); 227 #define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \ 228 if (LangOpts.CXXOperatorNames) \ 229 AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this); 230 #define OBJC1_AT_KEYWORD(NAME) \ 231 if (LangOpts.ObjC1) \ 232 AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this); 233 #define OBJC2_AT_KEYWORD(NAME) \ 234 if (LangOpts.ObjC2) \ 235 AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this); 236 #define TESTING_KEYWORD(NAME, FLAGS) 237 #include "clang/Basic/TokenKinds.def" 238 239 if (LangOpts.ParseUnknownAnytype) 240 AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL, 241 LangOpts, *this); 242 243 if (LangOpts.DeclSpecKeyword) 244 AddKeyword("__declspec", tok::kw___declspec, KEYALL, LangOpts, *this); 245 246 // Add the '_experimental_modules_import' contextual keyword. 247 get("import").setModulesImport(true); 248 } 249 250 /// Checks if the specified token kind represents a keyword in the 251 /// specified language. 252 /// \returns Status of the keyword in the language. 253 static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts, 254 tok::TokenKind K) { 255 switch (K) { 256 #define KEYWORD(NAME, FLAGS) \ 257 case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS); 258 #include "clang/Basic/TokenKinds.def" 259 default: return KS_Disabled; 260 } 261 } 262 263 /// Returns true if the identifier represents a keyword in the 264 /// specified language. 265 bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) const { 266 switch (getTokenKwStatus(LangOpts, getTokenID())) { 267 case KS_Enabled: 268 case KS_Extension: 269 return true; 270 default: 271 return false; 272 } 273 } 274 275 /// Returns true if the identifier represents a C++ keyword in the 276 /// specified language. 277 bool IdentifierInfo::isCPlusPlusKeyword(const LangOptions &LangOpts) const { 278 if (!LangOpts.CPlusPlus || !isKeyword(LangOpts)) 279 return false; 280 // This is a C++ keyword if this identifier is not a keyword when checked 281 // using LangOptions without C++ support. 282 LangOptions LangOptsNoCPP = LangOpts; 283 LangOptsNoCPP.CPlusPlus = false; 284 LangOptsNoCPP.CPlusPlus11 = false; 285 LangOptsNoCPP.CPlusPlus2a = false; 286 return !isKeyword(LangOptsNoCPP); 287 } 288 289 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { 290 // We use a perfect hash function here involving the length of the keyword, 291 // the first and third character. For preprocessor ID's there are no 292 // collisions (if there were, the switch below would complain about duplicate 293 // case values). Note that this depends on 'if' being null terminated. 294 295 #define HASH(LEN, FIRST, THIRD) \ 296 (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) 297 #define CASE(LEN, FIRST, THIRD, NAME) \ 298 case HASH(LEN, FIRST, THIRD): \ 299 return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME 300 301 unsigned Len = getLength(); 302 if (Len < 2) return tok::pp_not_keyword; 303 const char *Name = getNameStart(); 304 switch (HASH(Len, Name[0], Name[2])) { 305 default: return tok::pp_not_keyword; 306 CASE( 2, 'i', '\0', if); 307 CASE( 4, 'e', 'i', elif); 308 CASE( 4, 'e', 's', else); 309 CASE( 4, 'l', 'n', line); 310 CASE( 4, 's', 'c', sccs); 311 CASE( 5, 'e', 'd', endif); 312 CASE( 5, 'e', 'r', error); 313 CASE( 5, 'i', 'e', ident); 314 CASE( 5, 'i', 'd', ifdef); 315 CASE( 5, 'u', 'd', undef); 316 317 CASE( 6, 'a', 's', assert); 318 CASE( 6, 'd', 'f', define); 319 CASE( 6, 'i', 'n', ifndef); 320 CASE( 6, 'i', 'p', import); 321 CASE( 6, 'p', 'a', pragma); 322 323 CASE( 7, 'd', 'f', defined); 324 CASE( 7, 'i', 'c', include); 325 CASE( 7, 'w', 'r', warning); 326 327 CASE( 8, 'u', 'a', unassert); 328 CASE(12, 'i', 'c', include_next); 329 330 CASE(14, '_', 'p', __public_macro); 331 332 CASE(15, '_', 'p', __private_macro); 333 334 CASE(16, '_', 'i', __include_macros); 335 #undef CASE 336 #undef HASH 337 } 338 } 339 340 //===----------------------------------------------------------------------===// 341 // Stats Implementation 342 //===----------------------------------------------------------------------===// 343 344 /// PrintStats - Print statistics about how well the identifier table is doing 345 /// at hashing identifiers. 346 void IdentifierTable::PrintStats() const { 347 unsigned NumBuckets = HashTable.getNumBuckets(); 348 unsigned NumIdentifiers = HashTable.getNumItems(); 349 unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers; 350 unsigned AverageIdentifierSize = 0; 351 unsigned MaxIdentifierLength = 0; 352 353 // TODO: Figure out maximum times an identifier had to probe for -stats. 354 for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator 355 I = HashTable.begin(), E = HashTable.end(); I != E; ++I) { 356 unsigned IdLen = I->getKeyLength(); 357 AverageIdentifierSize += IdLen; 358 if (MaxIdentifierLength < IdLen) 359 MaxIdentifierLength = IdLen; 360 } 361 362 fprintf(stderr, "\n*** Identifier Table Stats:\n"); 363 fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers); 364 fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets); 365 fprintf(stderr, "Hash density (#identifiers per bucket): %f\n", 366 NumIdentifiers/(double)NumBuckets); 367 fprintf(stderr, "Ave identifier length: %f\n", 368 (AverageIdentifierSize/(double)NumIdentifiers)); 369 fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength); 370 371 // Compute statistics about the memory allocated for identifiers. 372 HashTable.getAllocator().PrintStats(); 373 } 374 375 //===----------------------------------------------------------------------===// 376 // SelectorTable Implementation 377 //===----------------------------------------------------------------------===// 378 379 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 380 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 381 } 382 383 namespace clang { 384 385 /// MultiKeywordSelector - One of these variable length records is kept for each 386 /// selector containing more than one keyword. We use a folding set 387 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to 388 /// this class is provided strictly through Selector. 389 class MultiKeywordSelector 390 : public DeclarationNameExtra, public llvm::FoldingSetNode { 391 MultiKeywordSelector(unsigned nKeys) { 392 ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys; 393 } 394 395 public: 396 // Constructor for keyword selectors. 397 MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) { 398 assert((nKeys > 1) && "not a multi-keyword selector"); 399 ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys; 400 401 // Fill in the trailing keyword array. 402 IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this+1); 403 for (unsigned i = 0; i != nKeys; ++i) 404 KeyInfo[i] = IIV[i]; 405 } 406 407 // getName - Derive the full selector name and return it. 408 std::string getName() const; 409 410 unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; } 411 412 using keyword_iterator = IdentifierInfo *const *; 413 414 keyword_iterator keyword_begin() const { 415 return reinterpret_cast<keyword_iterator>(this+1); 416 } 417 418 keyword_iterator keyword_end() const { 419 return keyword_begin()+getNumArgs(); 420 } 421 422 IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const { 423 assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index"); 424 return keyword_begin()[i]; 425 } 426 427 static void Profile(llvm::FoldingSetNodeID &ID, 428 keyword_iterator ArgTys, unsigned NumArgs) { 429 ID.AddInteger(NumArgs); 430 for (unsigned i = 0; i != NumArgs; ++i) 431 ID.AddPointer(ArgTys[i]); 432 } 433 434 void Profile(llvm::FoldingSetNodeID &ID) { 435 Profile(ID, keyword_begin(), getNumArgs()); 436 } 437 }; 438 439 } // namespace clang. 440 441 unsigned Selector::getNumArgs() const { 442 unsigned IIF = getIdentifierInfoFlag(); 443 if (IIF <= ZeroArg) 444 return 0; 445 if (IIF == OneArg) 446 return 1; 447 // We point to a MultiKeywordSelector. 448 MultiKeywordSelector *SI = getMultiKeywordSelector(); 449 return SI->getNumArgs(); 450 } 451 452 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const { 453 if (getIdentifierInfoFlag() < MultiArg) { 454 assert(argIndex == 0 && "illegal keyword index"); 455 return getAsIdentifierInfo(); 456 } 457 458 // We point to a MultiKeywordSelector. 459 MultiKeywordSelector *SI = getMultiKeywordSelector(); 460 return SI->getIdentifierInfoForSlot(argIndex); 461 } 462 463 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 464 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 465 return II? II->getName() : StringRef(); 466 } 467 468 std::string MultiKeywordSelector::getName() const { 469 SmallString<256> Str; 470 llvm::raw_svector_ostream OS(Str); 471 for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) { 472 if (*I) 473 OS << (*I)->getName(); 474 OS << ':'; 475 } 476 477 return OS.str(); 478 } 479 480 std::string Selector::getAsString() const { 481 if (InfoPtr == 0) 482 return "<null selector>"; 483 484 if (getIdentifierInfoFlag() < MultiArg) { 485 IdentifierInfo *II = getAsIdentifierInfo(); 486 487 if (getNumArgs() == 0) { 488 assert(II && "If the number of arguments is 0 then II is guaranteed to " 489 "not be null."); 490 return II->getName(); 491 } 492 493 if (!II) 494 return ":"; 495 496 return II->getName().str() + ":"; 497 } 498 499 // We have a multiple keyword selector. 500 return getMultiKeywordSelector()->getName(); 501 } 502 503 void Selector::print(llvm::raw_ostream &OS) const { 504 OS << getAsString(); 505 } 506 507 LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); } 508 509 /// Interpreting the given string using the normal CamelCase 510 /// conventions, determine whether the given string starts with the 511 /// given "word", which is assumed to end in a lowercase letter. 512 static bool startsWithWord(StringRef name, StringRef word) { 513 if (name.size() < word.size()) return false; 514 return ((name.size() == word.size() || !isLowercase(name[word.size()])) && 515 name.startswith(word)); 516 } 517 518 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) { 519 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 520 if (!first) return OMF_None; 521 522 StringRef name = first->getName(); 523 if (sel.isUnarySelector()) { 524 if (name == "autorelease") return OMF_autorelease; 525 if (name == "dealloc") return OMF_dealloc; 526 if (name == "finalize") return OMF_finalize; 527 if (name == "release") return OMF_release; 528 if (name == "retain") return OMF_retain; 529 if (name == "retainCount") return OMF_retainCount; 530 if (name == "self") return OMF_self; 531 if (name == "initialize") return OMF_initialize; 532 } 533 534 if (name == "performSelector" || name == "performSelectorInBackground" || 535 name == "performSelectorOnMainThread") 536 return OMF_performSelector; 537 538 // The other method families may begin with a prefix of underscores. 539 while (!name.empty() && name.front() == '_') 540 name = name.substr(1); 541 542 if (name.empty()) return OMF_None; 543 switch (name.front()) { 544 case 'a': 545 if (startsWithWord(name, "alloc")) return OMF_alloc; 546 break; 547 case 'c': 548 if (startsWithWord(name, "copy")) return OMF_copy; 549 break; 550 case 'i': 551 if (startsWithWord(name, "init")) return OMF_init; 552 break; 553 case 'm': 554 if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy; 555 break; 556 case 'n': 557 if (startsWithWord(name, "new")) return OMF_new; 558 break; 559 default: 560 break; 561 } 562 563 return OMF_None; 564 } 565 566 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) { 567 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 568 if (!first) return OIT_None; 569 570 StringRef name = first->getName(); 571 572 if (name.empty()) return OIT_None; 573 switch (name.front()) { 574 case 'a': 575 if (startsWithWord(name, "array")) return OIT_Array; 576 break; 577 case 'd': 578 if (startsWithWord(name, "default")) return OIT_ReturnsSelf; 579 if (startsWithWord(name, "dictionary")) return OIT_Dictionary; 580 break; 581 case 's': 582 if (startsWithWord(name, "shared")) return OIT_ReturnsSelf; 583 if (startsWithWord(name, "standard")) return OIT_Singleton; 584 break; 585 case 'i': 586 if (startsWithWord(name, "init")) return OIT_Init; 587 default: 588 break; 589 } 590 return OIT_None; 591 } 592 593 ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) { 594 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 595 if (!first) return SFF_None; 596 597 StringRef name = first->getName(); 598 599 switch (name.front()) { 600 case 'a': 601 if (name == "appendFormat") return SFF_NSString; 602 break; 603 604 case 'i': 605 if (name == "initWithFormat") return SFF_NSString; 606 break; 607 608 case 'l': 609 if (name == "localizedStringWithFormat") return SFF_NSString; 610 break; 611 612 case 's': 613 if (name == "stringByAppendingFormat" || 614 name == "stringWithFormat") return SFF_NSString; 615 break; 616 } 617 return SFF_None; 618 } 619 620 namespace { 621 622 struct SelectorTableImpl { 623 llvm::FoldingSet<MultiKeywordSelector> Table; 624 llvm::BumpPtrAllocator Allocator; 625 }; 626 627 } // namespace 628 629 static SelectorTableImpl &getSelectorTableImpl(void *P) { 630 return *static_cast<SelectorTableImpl*>(P); 631 } 632 633 SmallString<64> 634 SelectorTable::constructSetterName(StringRef Name) { 635 SmallString<64> SetterName("set"); 636 SetterName += Name; 637 SetterName[3] = toUppercase(SetterName[3]); 638 return SetterName; 639 } 640 641 Selector 642 SelectorTable::constructSetterSelector(IdentifierTable &Idents, 643 SelectorTable &SelTable, 644 const IdentifierInfo *Name) { 645 IdentifierInfo *SetterName = 646 &Idents.get(constructSetterName(Name->getName())); 647 return SelTable.getUnarySelector(SetterName); 648 } 649 650 std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) { 651 StringRef Name = Sel.getNameForSlot(0); 652 assert(Name.startswith("set") && "invalid setter name"); 653 return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str(); 654 } 655 656 size_t SelectorTable::getTotalMemory() const { 657 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 658 return SelTabImpl.Allocator.getTotalMemory(); 659 } 660 661 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) { 662 if (nKeys < 2) 663 return Selector(IIV[0], nKeys); 664 665 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 666 667 // Unique selector, to guarantee there is one per name. 668 llvm::FoldingSetNodeID ID; 669 MultiKeywordSelector::Profile(ID, IIV, nKeys); 670 671 void *InsertPos = nullptr; 672 if (MultiKeywordSelector *SI = 673 SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos)) 674 return Selector(SI); 675 676 // MultiKeywordSelector objects are not allocated with new because they have a 677 // variable size array (for parameter types) at the end of them. 678 unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *); 679 MultiKeywordSelector *SI = 680 (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate( 681 Size, alignof(MultiKeywordSelector)); 682 new (SI) MultiKeywordSelector(nKeys, IIV); 683 SelTabImpl.Table.InsertNode(SI, InsertPos); 684 return Selector(SI); 685 } 686 687 SelectorTable::SelectorTable() { 688 Impl = new SelectorTableImpl(); 689 } 690 691 SelectorTable::~SelectorTable() { 692 delete &getSelectorTableImpl(Impl); 693 } 694 695 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) { 696 switch (Operator) { 697 case OO_None: 698 case NUM_OVERLOADED_OPERATORS: 699 return nullptr; 700 701 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 702 case OO_##Name: return Spelling; 703 #include "clang/Basic/OperatorKinds.def" 704 } 705 706 llvm_unreachable("Invalid OverloadedOperatorKind!"); 707 } 708 709 StringRef clang::getNullabilitySpelling(NullabilityKind kind, 710 bool isContextSensitive) { 711 switch (kind) { 712 case NullabilityKind::NonNull: 713 return isContextSensitive ? "nonnull" : "_Nonnull"; 714 715 case NullabilityKind::Nullable: 716 return isContextSensitive ? "nullable" : "_Nullable"; 717 718 case NullabilityKind::Unspecified: 719 return isContextSensitive ? "null_unspecified" : "_Null_unspecified"; 720 } 721 llvm_unreachable("Unknown nullability kind."); 722 } 723