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 34 using 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. 39 static_assert(2 * LargestBuiltinID < (2 << (ObjCOrBuiltinIDBits - 1)), 40 "Insufficient ObjCOrBuiltinID Bits"); 41 42 //===----------------------------------------------------------------------===// 43 // IdentifierTable Implementation 44 //===----------------------------------------------------------------------===// 45 46 IdentifierIterator::~IdentifierIterator() = default; 47 48 IdentifierInfoLookup::~IdentifierInfoLookup() = default; 49 50 namespace { 51 52 /// A simple identifier lookup iterator that represents an 53 /// empty sequence of identifiers. 54 class EmptyLookupIterator : public IdentifierIterator 55 { 56 public: 57 StringRef Next() override { return StringRef(); } 58 }; 59 60 } // namespace 61 62 IdentifierIterator *IdentifierInfoLookup::getIdentifiers() { 63 return new EmptyLookupIterator(); 64 } 65 66 IdentifierTable::IdentifierTable(IdentifierInfoLookup *ExternalLookup) 67 : HashTable(8192), // Start with space for 8K identifiers. 68 ExternalLookup(ExternalLookup) {} 69 70 IdentifierTable::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 83 namespace { 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. 127 static 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. 164 static 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. 189 static 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". 198 static 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 /// 206 void 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. 237 static 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. 249 bool 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. 261 bool 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 } 272 273 tok::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. 330 void 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 //===----------------------------------------------------------------------===// 362 363 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 364 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 365 } 366 367 namespace 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. 373 class alignas(IdentifierInfoAlignment) MultiKeywordSelector 374 : public detail::DeclarationNameExtra, 375 public llvm::FoldingSetNode { 376 MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {} 377 378 public: 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. 423 424 bool 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 } 434 435 bool Selector::isUnarySelector(StringRef Name) const { 436 return isUnarySelector() && getNameForSlot(0) == Name; 437 } 438 439 unsigned 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 } 449 450 IdentifierInfo *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 } 460 461 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 462 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 463 return II ? II->getName() : StringRef(); 464 } 465 466 std::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 } 477 478 std::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 } 500 501 void Selector::print(llvm::raw_ostream &OS) const { 502 OS << getAsString(); 503 } 504 505 LLVM_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. 510 static 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 } 515 516 ObjCMethodFamily 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 } 563 564 ObjCInstanceTypeFamily 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 } 591 592 ObjCStringFormatFamily 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 } 618 619 namespace { 620 621 struct SelectorTableImpl { 622 llvm::FoldingSet<MultiKeywordSelector> Table; 623 llvm::BumpPtrAllocator Allocator; 624 }; 625 626 } // namespace 627 628 static SelectorTableImpl &getSelectorTableImpl(void *P) { 629 return *static_cast<SelectorTableImpl*>(P); 630 } 631 632 SmallString<64> 633 SelectorTable::constructSetterName(StringRef Name) { 634 SmallString<64> SetterName("set"); 635 SetterName += Name; 636 SetterName[3] = toUppercase(SetterName[3]); 637 return SetterName; 638 } 639 640 Selector 641 SelectorTable::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 } 648 649 std::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 } 654 655 size_t SelectorTable::getTotalMemory() const { 656 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 657 return SelTabImpl.Allocator.getTotalMemory(); 658 } 659 660 Selector 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 } 685 686 SelectorTable::SelectorTable() { 687 Impl = new SelectorTableImpl(); 688 } 689 690 SelectorTable::~SelectorTable() { 691 delete &getSelectorTableImpl(Impl); 692 } 693 694 const 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 } 707 708 StringRef 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