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/TokenKinds.h" 20 #include "llvm/ADT/DenseMapInfo.h" 21 #include "llvm/ADT/FoldingSet.h" 22 #include "llvm/ADT/SmallString.h" 23 #include "llvm/ADT/StringMap.h" 24 #include "llvm/ADT/StringRef.h" 25 #include "llvm/Support/Allocator.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include "llvm/Support/raw_ostream.h" 28 #include <cassert> 29 #include <cstdio> 30 #include <cstring> 31 #include <string> 32 33 using namespace clang; 34 35 //===----------------------------------------------------------------------===// 36 // IdentifierTable Implementation 37 //===----------------------------------------------------------------------===// 38 39 IdentifierIterator::~IdentifierIterator() = default; 40 41 IdentifierInfoLookup::~IdentifierInfoLookup() = default; 42 43 namespace { 44 45 /// A simple identifier lookup iterator that represents an 46 /// empty sequence of identifiers. 47 class EmptyLookupIterator : public IdentifierIterator 48 { 49 public: 50 StringRef Next() override { return StringRef(); } 51 }; 52 53 } // namespace 54 55 IdentifierIterator *IdentifierInfoLookup::getIdentifiers() { 56 return new EmptyLookupIterator(); 57 } 58 59 IdentifierTable::IdentifierTable(IdentifierInfoLookup *ExternalLookup) 60 : HashTable(8192), // Start with space for 8K identifiers. 61 ExternalLookup(ExternalLookup) {} 62 63 IdentifierTable::IdentifierTable(const LangOptions &LangOpts, 64 IdentifierInfoLookup *ExternalLookup) 65 : IdentifierTable(ExternalLookup) { 66 // Populate the identifier table with info about keywords for the current 67 // language. 68 AddKeywords(LangOpts); 69 } 70 71 //===----------------------------------------------------------------------===// 72 // Language Keyword Implementation 73 //===----------------------------------------------------------------------===// 74 75 // Constants for TokenKinds.def 76 namespace { 77 78 enum { 79 KEYC99 = 0x1, 80 KEYCXX = 0x2, 81 KEYCXX11 = 0x4, 82 KEYGNU = 0x8, 83 KEYMS = 0x10, 84 BOOLSUPPORT = 0x20, 85 KEYALTIVEC = 0x40, 86 KEYNOCXX = 0x80, 87 KEYBORLAND = 0x100, 88 KEYOPENCLC = 0x200, 89 KEYC11 = 0x400, 90 KEYNOMS18 = 0x800, 91 KEYNOOPENCL = 0x1000, 92 WCHARSUPPORT = 0x2000, 93 HALFSUPPORT = 0x4000, 94 CHAR8SUPPORT = 0x8000, 95 KEYCONCEPTS = 0x10000, 96 KEYOBJC = 0x20000, 97 KEYZVECTOR = 0x40000, 98 KEYCOROUTINES = 0x80000, 99 KEYMODULES = 0x100000, 100 KEYCXX2A = 0x200000, 101 KEYOPENCLCXX = 0x400000, 102 KEYMSCOMPAT = 0x800000, 103 KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX2A, 104 KEYALL = (0xffffff & ~KEYNOMS18 & 105 ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude. 106 }; 107 108 /// How a keyword is treated in the selected standard. 109 enum KeywordStatus { 110 KS_Disabled, // Disabled 111 KS_Extension, // Is an extension 112 KS_Enabled, // Enabled 113 KS_Future // Is a keyword in future standard 114 }; 115 116 } // namespace 117 118 /// Translates flags as specified in TokenKinds.def into keyword status 119 /// in the given language standard. 120 static KeywordStatus getKeywordStatus(const LangOptions &LangOpts, 121 unsigned Flags) { 122 if (Flags == KEYALL) return KS_Enabled; 123 if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled; 124 if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled; 125 if (LangOpts.CPlusPlus2a && (Flags & KEYCXX2A)) return KS_Enabled; 126 if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled; 127 if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension; 128 if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension; 129 if (LangOpts.MSVCCompat && (Flags & KEYMSCOMPAT)) return KS_Enabled; 130 if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension; 131 if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled; 132 if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled; 133 if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled; 134 if (LangOpts.Char8 && (Flags & CHAR8SUPPORT)) return KS_Enabled; 135 if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled; 136 if (LangOpts.ZVector && (Flags & KEYZVECTOR)) return KS_Enabled; 137 if (LangOpts.OpenCL && !LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLC)) 138 return KS_Enabled; 139 if (LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLCXX)) return KS_Enabled; 140 if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled; 141 if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled; 142 // We treat bridge casts as objective-C keywords so we can warn on them 143 // in non-arc mode. 144 if (LangOpts.ObjC && (Flags & KEYOBJC)) return KS_Enabled; 145 if (LangOpts.CPlusPlus2a && (Flags & KEYCONCEPTS)) return KS_Enabled; 146 if (LangOpts.Coroutines && (Flags & KEYCOROUTINES)) return KS_Enabled; 147 if (LangOpts.ModulesTS && (Flags & KEYMODULES)) return KS_Enabled; 148 if (LangOpts.CPlusPlus && (Flags & KEYALLCXX)) return KS_Future; 149 return KS_Disabled; 150 } 151 152 /// AddKeyword - This method is used to associate a token ID with specific 153 /// identifiers because they are language keywords. This causes the lexer to 154 /// automatically map matching identifiers to specialized token codes. 155 static void AddKeyword(StringRef Keyword, 156 tok::TokenKind TokenCode, unsigned Flags, 157 const LangOptions &LangOpts, IdentifierTable &Table) { 158 KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags); 159 160 // Don't add this keyword under MSVCCompat. 161 if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) && 162 !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015)) 163 return; 164 165 // Don't add this keyword under OpenCL. 166 if (LangOpts.OpenCL && (Flags & KEYNOOPENCL)) 167 return; 168 169 // Don't add this keyword if disabled in this language. 170 if (AddResult == KS_Disabled) return; 171 172 IdentifierInfo &Info = 173 Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode); 174 Info.setIsExtensionToken(AddResult == KS_Extension); 175 Info.setIsFutureCompatKeyword(AddResult == KS_Future); 176 } 177 178 /// AddCXXOperatorKeyword - Register a C++ operator keyword alternative 179 /// representations. 180 static void AddCXXOperatorKeyword(StringRef Keyword, 181 tok::TokenKind TokenCode, 182 IdentifierTable &Table) { 183 IdentifierInfo &Info = Table.get(Keyword, TokenCode); 184 Info.setIsCPlusPlusOperatorKeyword(); 185 } 186 187 /// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector" 188 /// or "property". 189 static void AddObjCKeyword(StringRef Name, 190 tok::ObjCKeywordKind ObjCID, 191 IdentifierTable &Table) { 192 Table.get(Name).setObjCKeywordID(ObjCID); 193 } 194 195 /// AddKeywords - Add all keywords to the symbol table. 196 /// 197 void IdentifierTable::AddKeywords(const LangOptions &LangOpts) { 198 // Add keywords and tokens for the current language. 199 #define KEYWORD(NAME, FLAGS) \ 200 AddKeyword(StringRef(#NAME), tok::kw_ ## NAME, \ 201 FLAGS, LangOpts, *this); 202 #define ALIAS(NAME, TOK, FLAGS) \ 203 AddKeyword(StringRef(NAME), tok::kw_ ## TOK, \ 204 FLAGS, LangOpts, *this); 205 #define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \ 206 if (LangOpts.CXXOperatorNames) \ 207 AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this); 208 #define OBJC_AT_KEYWORD(NAME) \ 209 if (LangOpts.ObjC) \ 210 AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this); 211 #define TESTING_KEYWORD(NAME, FLAGS) 212 #include "clang/Basic/TokenKinds.def" 213 214 if (LangOpts.ParseUnknownAnytype) 215 AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL, 216 LangOpts, *this); 217 218 if (LangOpts.DeclSpecKeyword) 219 AddKeyword("__declspec", tok::kw___declspec, KEYALL, LangOpts, *this); 220 221 // Add the 'import' contextual keyword. 222 get("import").setModulesImport(true); 223 } 224 225 /// Checks if the specified token kind represents a keyword in the 226 /// specified language. 227 /// \returns Status of the keyword in the language. 228 static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts, 229 tok::TokenKind K) { 230 switch (K) { 231 #define KEYWORD(NAME, FLAGS) \ 232 case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS); 233 #include "clang/Basic/TokenKinds.def" 234 default: return KS_Disabled; 235 } 236 } 237 238 /// Returns true if the identifier represents a keyword in the 239 /// specified language. 240 bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) const { 241 switch (getTokenKwStatus(LangOpts, getTokenID())) { 242 case KS_Enabled: 243 case KS_Extension: 244 return true; 245 default: 246 return false; 247 } 248 } 249 250 /// Returns true if the identifier represents a C++ keyword in the 251 /// specified language. 252 bool IdentifierInfo::isCPlusPlusKeyword(const LangOptions &LangOpts) const { 253 if (!LangOpts.CPlusPlus || !isKeyword(LangOpts)) 254 return false; 255 // This is a C++ keyword if this identifier is not a keyword when checked 256 // using LangOptions without C++ support. 257 LangOptions LangOptsNoCPP = LangOpts; 258 LangOptsNoCPP.CPlusPlus = false; 259 LangOptsNoCPP.CPlusPlus11 = false; 260 LangOptsNoCPP.CPlusPlus2a = false; 261 return !isKeyword(LangOptsNoCPP); 262 } 263 264 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { 265 // We use a perfect hash function here involving the length of the keyword, 266 // the first and third character. For preprocessor ID's there are no 267 // collisions (if there were, the switch below would complain about duplicate 268 // case values). Note that this depends on 'if' being null terminated. 269 270 #define HASH(LEN, FIRST, THIRD) \ 271 (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) 272 #define CASE(LEN, FIRST, THIRD, NAME) \ 273 case HASH(LEN, FIRST, THIRD): \ 274 return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME 275 276 unsigned Len = getLength(); 277 if (Len < 2) return tok::pp_not_keyword; 278 const char *Name = getNameStart(); 279 switch (HASH(Len, Name[0], Name[2])) { 280 default: return tok::pp_not_keyword; 281 CASE( 2, 'i', '\0', if); 282 CASE( 4, 'e', 'i', elif); 283 CASE( 4, 'e', 's', else); 284 CASE( 4, 'l', 'n', line); 285 CASE( 4, 's', 'c', sccs); 286 CASE( 5, 'e', 'd', endif); 287 CASE( 5, 'e', 'r', error); 288 CASE( 5, 'i', 'e', ident); 289 CASE( 5, 'i', 'd', ifdef); 290 CASE( 5, 'u', 'd', undef); 291 292 CASE( 6, 'a', 's', assert); 293 CASE( 6, 'd', 'f', define); 294 CASE( 6, 'i', 'n', ifndef); 295 CASE( 6, 'i', 'p', import); 296 CASE( 6, 'p', 'a', pragma); 297 298 CASE( 7, 'd', 'f', defined); 299 CASE( 7, 'i', 'c', include); 300 CASE( 7, 'w', 'r', warning); 301 302 CASE( 8, 'u', 'a', unassert); 303 CASE(12, 'i', 'c', include_next); 304 305 CASE(14, '_', 'p', __public_macro); 306 307 CASE(15, '_', 'p', __private_macro); 308 309 CASE(16, '_', 'i', __include_macros); 310 #undef CASE 311 #undef HASH 312 } 313 } 314 315 //===----------------------------------------------------------------------===// 316 // Stats Implementation 317 //===----------------------------------------------------------------------===// 318 319 /// PrintStats - Print statistics about how well the identifier table is doing 320 /// at hashing identifiers. 321 void IdentifierTable::PrintStats() const { 322 unsigned NumBuckets = HashTable.getNumBuckets(); 323 unsigned NumIdentifiers = HashTable.getNumItems(); 324 unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers; 325 unsigned AverageIdentifierSize = 0; 326 unsigned MaxIdentifierLength = 0; 327 328 // TODO: Figure out maximum times an identifier had to probe for -stats. 329 for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator 330 I = HashTable.begin(), E = HashTable.end(); I != E; ++I) { 331 unsigned IdLen = I->getKeyLength(); 332 AverageIdentifierSize += IdLen; 333 if (MaxIdentifierLength < IdLen) 334 MaxIdentifierLength = IdLen; 335 } 336 337 fprintf(stderr, "\n*** Identifier Table Stats:\n"); 338 fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers); 339 fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets); 340 fprintf(stderr, "Hash density (#identifiers per bucket): %f\n", 341 NumIdentifiers/(double)NumBuckets); 342 fprintf(stderr, "Ave identifier length: %f\n", 343 (AverageIdentifierSize/(double)NumIdentifiers)); 344 fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength); 345 346 // Compute statistics about the memory allocated for identifiers. 347 HashTable.getAllocator().PrintStats(); 348 } 349 350 //===----------------------------------------------------------------------===// 351 // SelectorTable Implementation 352 //===----------------------------------------------------------------------===// 353 354 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 355 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 356 } 357 358 namespace clang { 359 360 /// One of these variable length records is kept for each 361 /// selector containing more than one keyword. We use a folding set 362 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to 363 /// this class is provided strictly through Selector. 364 class alignas(IdentifierInfoAlignment) MultiKeywordSelector 365 : public detail::DeclarationNameExtra, 366 public llvm::FoldingSetNode { 367 MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {} 368 369 public: 370 // Constructor for keyword selectors. 371 MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) 372 : DeclarationNameExtra(nKeys) { 373 assert((nKeys > 1) && "not a multi-keyword selector"); 374 375 // Fill in the trailing keyword array. 376 IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1); 377 for (unsigned i = 0; i != nKeys; ++i) 378 KeyInfo[i] = IIV[i]; 379 } 380 381 // getName - Derive the full selector name and return it. 382 std::string getName() const; 383 384 using DeclarationNameExtra::getNumArgs; 385 386 using keyword_iterator = IdentifierInfo *const *; 387 388 keyword_iterator keyword_begin() const { 389 return reinterpret_cast<keyword_iterator>(this + 1); 390 } 391 392 keyword_iterator keyword_end() const { 393 return keyword_begin() + getNumArgs(); 394 } 395 396 IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const { 397 assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index"); 398 return keyword_begin()[i]; 399 } 400 401 static void Profile(llvm::FoldingSetNodeID &ID, keyword_iterator ArgTys, 402 unsigned NumArgs) { 403 ID.AddInteger(NumArgs); 404 for (unsigned i = 0; i != NumArgs; ++i) 405 ID.AddPointer(ArgTys[i]); 406 } 407 408 void Profile(llvm::FoldingSetNodeID &ID) { 409 Profile(ID, keyword_begin(), getNumArgs()); 410 } 411 }; 412 413 } // namespace clang. 414 415 bool Selector::isKeywordSelector(ArrayRef<StringRef> Names) const { 416 assert(!Names.empty() && "must have >= 1 selector slots"); 417 if (getNumArgs() != Names.size()) 418 return false; 419 for (unsigned I = 0, E = Names.size(); I != E; ++I) { 420 if (getNameForSlot(I) != Names[I]) 421 return false; 422 } 423 return true; 424 } 425 426 bool Selector::isUnarySelector(StringRef Name) const { 427 return isUnarySelector() && getNameForSlot(0) == Name; 428 } 429 430 unsigned Selector::getNumArgs() const { 431 unsigned IIF = getIdentifierInfoFlag(); 432 if (IIF <= ZeroArg) 433 return 0; 434 if (IIF == OneArg) 435 return 1; 436 // We point to a MultiKeywordSelector. 437 MultiKeywordSelector *SI = getMultiKeywordSelector(); 438 return SI->getNumArgs(); 439 } 440 441 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const { 442 if (getIdentifierInfoFlag() < MultiArg) { 443 assert(argIndex == 0 && "illegal keyword index"); 444 return getAsIdentifierInfo(); 445 } 446 447 // We point to a MultiKeywordSelector. 448 MultiKeywordSelector *SI = getMultiKeywordSelector(); 449 return SI->getIdentifierInfoForSlot(argIndex); 450 } 451 452 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 453 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 454 return II ? II->getName() : StringRef(); 455 } 456 457 std::string MultiKeywordSelector::getName() const { 458 SmallString<256> Str; 459 llvm::raw_svector_ostream OS(Str); 460 for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) { 461 if (*I) 462 OS << (*I)->getName(); 463 OS << ':'; 464 } 465 466 return OS.str(); 467 } 468 469 std::string Selector::getAsString() const { 470 if (InfoPtr == 0) 471 return "<null selector>"; 472 473 if (getIdentifierInfoFlag() < MultiArg) { 474 IdentifierInfo *II = getAsIdentifierInfo(); 475 476 if (getNumArgs() == 0) { 477 assert(II && "If the number of arguments is 0 then II is guaranteed to " 478 "not be null."); 479 return II->getName(); 480 } 481 482 if (!II) 483 return ":"; 484 485 return II->getName().str() + ":"; 486 } 487 488 // We have a multiple keyword selector. 489 return getMultiKeywordSelector()->getName(); 490 } 491 492 void Selector::print(llvm::raw_ostream &OS) const { 493 OS << getAsString(); 494 } 495 496 LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); } 497 498 /// Interpreting the given string using the normal CamelCase 499 /// conventions, determine whether the given string starts with the 500 /// given "word", which is assumed to end in a lowercase letter. 501 static bool startsWithWord(StringRef name, StringRef word) { 502 if (name.size() < word.size()) return false; 503 return ((name.size() == word.size() || !isLowercase(name[word.size()])) && 504 name.startswith(word)); 505 } 506 507 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) { 508 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 509 if (!first) return OMF_None; 510 511 StringRef name = first->getName(); 512 if (sel.isUnarySelector()) { 513 if (name == "autorelease") return OMF_autorelease; 514 if (name == "dealloc") return OMF_dealloc; 515 if (name == "finalize") return OMF_finalize; 516 if (name == "release") return OMF_release; 517 if (name == "retain") return OMF_retain; 518 if (name == "retainCount") return OMF_retainCount; 519 if (name == "self") return OMF_self; 520 if (name == "initialize") return OMF_initialize; 521 } 522 523 if (name == "performSelector" || name == "performSelectorInBackground" || 524 name == "performSelectorOnMainThread") 525 return OMF_performSelector; 526 527 // The other method families may begin with a prefix of underscores. 528 while (!name.empty() && name.front() == '_') 529 name = name.substr(1); 530 531 if (name.empty()) return OMF_None; 532 switch (name.front()) { 533 case 'a': 534 if (startsWithWord(name, "alloc")) return OMF_alloc; 535 break; 536 case 'c': 537 if (startsWithWord(name, "copy")) return OMF_copy; 538 break; 539 case 'i': 540 if (startsWithWord(name, "init")) return OMF_init; 541 break; 542 case 'm': 543 if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy; 544 break; 545 case 'n': 546 if (startsWithWord(name, "new")) return OMF_new; 547 break; 548 default: 549 break; 550 } 551 552 return OMF_None; 553 } 554 555 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) { 556 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 557 if (!first) return OIT_None; 558 559 StringRef name = first->getName(); 560 561 if (name.empty()) return OIT_None; 562 switch (name.front()) { 563 case 'a': 564 if (startsWithWord(name, "array")) return OIT_Array; 565 break; 566 case 'd': 567 if (startsWithWord(name, "default")) return OIT_ReturnsSelf; 568 if (startsWithWord(name, "dictionary")) return OIT_Dictionary; 569 break; 570 case 's': 571 if (startsWithWord(name, "shared")) return OIT_ReturnsSelf; 572 if (startsWithWord(name, "standard")) return OIT_Singleton; 573 break; 574 case 'i': 575 if (startsWithWord(name, "init")) return OIT_Init; 576 break; 577 default: 578 break; 579 } 580 return OIT_None; 581 } 582 583 ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) { 584 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 585 if (!first) return SFF_None; 586 587 StringRef name = first->getName(); 588 589 switch (name.front()) { 590 case 'a': 591 if (name == "appendFormat") return SFF_NSString; 592 break; 593 594 case 'i': 595 if (name == "initWithFormat") return SFF_NSString; 596 break; 597 598 case 'l': 599 if (name == "localizedStringWithFormat") return SFF_NSString; 600 break; 601 602 case 's': 603 if (name == "stringByAppendingFormat" || 604 name == "stringWithFormat") return SFF_NSString; 605 break; 606 } 607 return SFF_None; 608 } 609 610 namespace { 611 612 struct SelectorTableImpl { 613 llvm::FoldingSet<MultiKeywordSelector> Table; 614 llvm::BumpPtrAllocator Allocator; 615 }; 616 617 } // namespace 618 619 static SelectorTableImpl &getSelectorTableImpl(void *P) { 620 return *static_cast<SelectorTableImpl*>(P); 621 } 622 623 SmallString<64> 624 SelectorTable::constructSetterName(StringRef Name) { 625 SmallString<64> SetterName("set"); 626 SetterName += Name; 627 SetterName[3] = toUppercase(SetterName[3]); 628 return SetterName; 629 } 630 631 Selector 632 SelectorTable::constructSetterSelector(IdentifierTable &Idents, 633 SelectorTable &SelTable, 634 const IdentifierInfo *Name) { 635 IdentifierInfo *SetterName = 636 &Idents.get(constructSetterName(Name->getName())); 637 return SelTable.getUnarySelector(SetterName); 638 } 639 640 std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) { 641 StringRef Name = Sel.getNameForSlot(0); 642 assert(Name.startswith("set") && "invalid setter name"); 643 return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str(); 644 } 645 646 size_t SelectorTable::getTotalMemory() const { 647 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 648 return SelTabImpl.Allocator.getTotalMemory(); 649 } 650 651 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) { 652 if (nKeys < 2) 653 return Selector(IIV[0], nKeys); 654 655 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 656 657 // Unique selector, to guarantee there is one per name. 658 llvm::FoldingSetNodeID ID; 659 MultiKeywordSelector::Profile(ID, IIV, nKeys); 660 661 void *InsertPos = nullptr; 662 if (MultiKeywordSelector *SI = 663 SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos)) 664 return Selector(SI); 665 666 // MultiKeywordSelector objects are not allocated with new because they have a 667 // variable size array (for parameter types) at the end of them. 668 unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *); 669 MultiKeywordSelector *SI = 670 (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate( 671 Size, alignof(MultiKeywordSelector)); 672 new (SI) MultiKeywordSelector(nKeys, IIV); 673 SelTabImpl.Table.InsertNode(SI, InsertPos); 674 return Selector(SI); 675 } 676 677 SelectorTable::SelectorTable() { 678 Impl = new SelectorTableImpl(); 679 } 680 681 SelectorTable::~SelectorTable() { 682 delete &getSelectorTableImpl(Impl); 683 } 684 685 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) { 686 switch (Operator) { 687 case OO_None: 688 case NUM_OVERLOADED_OPERATORS: 689 return nullptr; 690 691 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 692 case OO_##Name: return Spelling; 693 #include "clang/Basic/OperatorKinds.def" 694 } 695 696 llvm_unreachable("Invalid OverloadedOperatorKind!"); 697 } 698 699 StringRef clang::getNullabilitySpelling(NullabilityKind kind, 700 bool isContextSensitive) { 701 switch (kind) { 702 case NullabilityKind::NonNull: 703 return isContextSensitive ? "nonnull" : "_Nonnull"; 704 705 case NullabilityKind::Nullable: 706 return isContextSensitive ? "nullable" : "_Nullable"; 707 708 case NullabilityKind::Unspecified: 709 return isContextSensitive ? "null_unspecified" : "_Null_unspecified"; 710 } 711 llvm_unreachable("Unknown nullability kind."); 712 } 713