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 if (LangOpts.IEEE128) 231 AddKeyword("__ieee128", tok::kw___float128, KEYALL, LangOpts, *this); 232 233 // Add the 'import' contextual keyword. 234 get("import").setModulesImport(true); 235 } 236 237 /// Checks if the specified token kind represents a keyword in the 238 /// specified language. 239 /// \returns Status of the keyword in the language. 240 static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts, 241 tok::TokenKind K) { 242 switch (K) { 243 #define KEYWORD(NAME, FLAGS) \ 244 case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS); 245 #include "clang/Basic/TokenKinds.def" 246 default: return KS_Disabled; 247 } 248 } 249 250 /// Returns true if the identifier represents a keyword in the 251 /// specified language. 252 bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) const { 253 switch (getTokenKwStatus(LangOpts, getTokenID())) { 254 case KS_Enabled: 255 case KS_Extension: 256 return true; 257 default: 258 return false; 259 } 260 } 261 262 /// Returns true if the identifier represents a C++ keyword in the 263 /// specified language. 264 bool IdentifierInfo::isCPlusPlusKeyword(const LangOptions &LangOpts) const { 265 if (!LangOpts.CPlusPlus || !isKeyword(LangOpts)) 266 return false; 267 // This is a C++ keyword if this identifier is not a keyword when checked 268 // using LangOptions without C++ support. 269 LangOptions LangOptsNoCPP = LangOpts; 270 LangOptsNoCPP.CPlusPlus = false; 271 LangOptsNoCPP.CPlusPlus11 = false; 272 LangOptsNoCPP.CPlusPlus20 = false; 273 return !isKeyword(LangOptsNoCPP); 274 } 275 276 ReservedIdentifierStatus 277 IdentifierInfo::isReserved(const LangOptions &LangOpts) const { 278 StringRef Name = getName(); 279 280 // '_' is a reserved identifier, but its use is so common (e.g. to store 281 // ignored values) that we don't warn on it. 282 if (Name.size() <= 1) 283 return ReservedIdentifierStatus::NotReserved; 284 285 // [lex.name] p3 286 if (Name[0] == '_') { 287 288 // Each name that begins with an underscore followed by an uppercase letter 289 // or another underscore is reserved. 290 if (Name[1] == '_') 291 return ReservedIdentifierStatus::StartsWithDoubleUnderscore; 292 293 if ('A' <= Name[1] && Name[1] <= 'Z') 294 return ReservedIdentifierStatus:: 295 StartsWithUnderscoreFollowedByCapitalLetter; 296 297 // This is a bit misleading: it actually means it's only reserved if we're 298 // at global scope because it starts with an underscore. 299 return ReservedIdentifierStatus::StartsWithUnderscoreAtGlobalScope; 300 } 301 302 // Each name that contains a double underscore (__) is reserved. 303 if (LangOpts.CPlusPlus && Name.contains("__")) 304 return ReservedIdentifierStatus::ContainsDoubleUnderscore; 305 306 return ReservedIdentifierStatus::NotReserved; 307 } 308 309 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { 310 // We use a perfect hash function here involving the length of the keyword, 311 // the first and third character. For preprocessor ID's there are no 312 // collisions (if there were, the switch below would complain about duplicate 313 // case values). Note that this depends on 'if' being null terminated. 314 315 #define HASH(LEN, FIRST, THIRD) \ 316 (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) 317 #define CASE(LEN, FIRST, THIRD, NAME) \ 318 case HASH(LEN, FIRST, THIRD): \ 319 return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME 320 321 unsigned Len = getLength(); 322 if (Len < 2) return tok::pp_not_keyword; 323 const char *Name = getNameStart(); 324 switch (HASH(Len, Name[0], Name[2])) { 325 default: return tok::pp_not_keyword; 326 CASE( 2, 'i', '\0', if); 327 CASE( 4, 'e', 'i', elif); 328 CASE( 4, 'e', 's', else); 329 CASE( 4, 'l', 'n', line); 330 CASE( 4, 's', 'c', sccs); 331 CASE( 5, 'e', 'd', endif); 332 CASE( 5, 'e', 'r', error); 333 CASE( 5, 'i', 'e', ident); 334 CASE( 5, 'i', 'd', ifdef); 335 CASE( 5, 'u', 'd', undef); 336 337 CASE( 6, 'a', 's', assert); 338 CASE( 6, 'd', 'f', define); 339 CASE( 6, 'i', 'n', ifndef); 340 CASE( 6, 'i', 'p', import); 341 CASE( 6, 'p', 'a', pragma); 342 343 CASE( 7, 'd', 'f', defined); 344 CASE( 7, 'i', 'c', include); 345 CASE( 7, 'w', 'r', warning); 346 347 CASE( 8, 'u', 'a', unassert); 348 CASE(12, 'i', 'c', include_next); 349 350 CASE(14, '_', 'p', __public_macro); 351 352 CASE(15, '_', 'p', __private_macro); 353 354 CASE(16, '_', 'i', __include_macros); 355 #undef CASE 356 #undef HASH 357 } 358 } 359 360 //===----------------------------------------------------------------------===// 361 // Stats Implementation 362 //===----------------------------------------------------------------------===// 363 364 /// PrintStats - Print statistics about how well the identifier table is doing 365 /// at hashing identifiers. 366 void IdentifierTable::PrintStats() const { 367 unsigned NumBuckets = HashTable.getNumBuckets(); 368 unsigned NumIdentifiers = HashTable.getNumItems(); 369 unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers; 370 unsigned AverageIdentifierSize = 0; 371 unsigned MaxIdentifierLength = 0; 372 373 // TODO: Figure out maximum times an identifier had to probe for -stats. 374 for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator 375 I = HashTable.begin(), E = HashTable.end(); I != E; ++I) { 376 unsigned IdLen = I->getKeyLength(); 377 AverageIdentifierSize += IdLen; 378 if (MaxIdentifierLength < IdLen) 379 MaxIdentifierLength = IdLen; 380 } 381 382 fprintf(stderr, "\n*** Identifier Table Stats:\n"); 383 fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers); 384 fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets); 385 fprintf(stderr, "Hash density (#identifiers per bucket): %f\n", 386 NumIdentifiers/(double)NumBuckets); 387 fprintf(stderr, "Ave identifier length: %f\n", 388 (AverageIdentifierSize/(double)NumIdentifiers)); 389 fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength); 390 391 // Compute statistics about the memory allocated for identifiers. 392 HashTable.getAllocator().PrintStats(); 393 } 394 395 //===----------------------------------------------------------------------===// 396 // SelectorTable Implementation 397 //===----------------------------------------------------------------------===// 398 399 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 400 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 401 } 402 403 namespace clang { 404 405 /// One of these variable length records is kept for each 406 /// selector containing more than one keyword. We use a folding set 407 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to 408 /// this class is provided strictly through Selector. 409 class alignas(IdentifierInfoAlignment) MultiKeywordSelector 410 : public detail::DeclarationNameExtra, 411 public llvm::FoldingSetNode { 412 MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {} 413 414 public: 415 // Constructor for keyword selectors. 416 MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) 417 : DeclarationNameExtra(nKeys) { 418 assert((nKeys > 1) && "not a multi-keyword selector"); 419 420 // Fill in the trailing keyword array. 421 IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1); 422 for (unsigned i = 0; i != nKeys; ++i) 423 KeyInfo[i] = IIV[i]; 424 } 425 426 // getName - Derive the full selector name and return it. 427 std::string getName() const; 428 429 using DeclarationNameExtra::getNumArgs; 430 431 using keyword_iterator = IdentifierInfo *const *; 432 433 keyword_iterator keyword_begin() const { 434 return reinterpret_cast<keyword_iterator>(this + 1); 435 } 436 437 keyword_iterator keyword_end() const { 438 return keyword_begin() + getNumArgs(); 439 } 440 441 IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const { 442 assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index"); 443 return keyword_begin()[i]; 444 } 445 446 static void Profile(llvm::FoldingSetNodeID &ID, keyword_iterator ArgTys, 447 unsigned NumArgs) { 448 ID.AddInteger(NumArgs); 449 for (unsigned i = 0; i != NumArgs; ++i) 450 ID.AddPointer(ArgTys[i]); 451 } 452 453 void Profile(llvm::FoldingSetNodeID &ID) { 454 Profile(ID, keyword_begin(), getNumArgs()); 455 } 456 }; 457 458 } // namespace clang. 459 460 bool Selector::isKeywordSelector(ArrayRef<StringRef> Names) const { 461 assert(!Names.empty() && "must have >= 1 selector slots"); 462 if (getNumArgs() != Names.size()) 463 return false; 464 for (unsigned I = 0, E = Names.size(); I != E; ++I) { 465 if (getNameForSlot(I) != Names[I]) 466 return false; 467 } 468 return true; 469 } 470 471 bool Selector::isUnarySelector(StringRef Name) const { 472 return isUnarySelector() && getNameForSlot(0) == Name; 473 } 474 475 unsigned Selector::getNumArgs() const { 476 unsigned IIF = getIdentifierInfoFlag(); 477 if (IIF <= ZeroArg) 478 return 0; 479 if (IIF == OneArg) 480 return 1; 481 // We point to a MultiKeywordSelector. 482 MultiKeywordSelector *SI = getMultiKeywordSelector(); 483 return SI->getNumArgs(); 484 } 485 486 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const { 487 if (getIdentifierInfoFlag() < MultiArg) { 488 assert(argIndex == 0 && "illegal keyword index"); 489 return getAsIdentifierInfo(); 490 } 491 492 // We point to a MultiKeywordSelector. 493 MultiKeywordSelector *SI = getMultiKeywordSelector(); 494 return SI->getIdentifierInfoForSlot(argIndex); 495 } 496 497 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 498 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 499 return II ? II->getName() : StringRef(); 500 } 501 502 std::string MultiKeywordSelector::getName() const { 503 SmallString<256> Str; 504 llvm::raw_svector_ostream OS(Str); 505 for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) { 506 if (*I) 507 OS << (*I)->getName(); 508 OS << ':'; 509 } 510 511 return std::string(OS.str()); 512 } 513 514 std::string Selector::getAsString() const { 515 if (InfoPtr == 0) 516 return "<null selector>"; 517 518 if (getIdentifierInfoFlag() < MultiArg) { 519 IdentifierInfo *II = getAsIdentifierInfo(); 520 521 if (getNumArgs() == 0) { 522 assert(II && "If the number of arguments is 0 then II is guaranteed to " 523 "not be null."); 524 return std::string(II->getName()); 525 } 526 527 if (!II) 528 return ":"; 529 530 return II->getName().str() + ":"; 531 } 532 533 // We have a multiple keyword selector. 534 return getMultiKeywordSelector()->getName(); 535 } 536 537 void Selector::print(llvm::raw_ostream &OS) const { 538 OS << getAsString(); 539 } 540 541 LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); } 542 543 /// Interpreting the given string using the normal CamelCase 544 /// conventions, determine whether the given string starts with the 545 /// given "word", which is assumed to end in a lowercase letter. 546 static bool startsWithWord(StringRef name, StringRef word) { 547 if (name.size() < word.size()) return false; 548 return ((name.size() == word.size() || !isLowercase(name[word.size()])) && 549 name.startswith(word)); 550 } 551 552 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) { 553 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 554 if (!first) return OMF_None; 555 556 StringRef name = first->getName(); 557 if (sel.isUnarySelector()) { 558 if (name == "autorelease") return OMF_autorelease; 559 if (name == "dealloc") return OMF_dealloc; 560 if (name == "finalize") return OMF_finalize; 561 if (name == "release") return OMF_release; 562 if (name == "retain") return OMF_retain; 563 if (name == "retainCount") return OMF_retainCount; 564 if (name == "self") return OMF_self; 565 if (name == "initialize") return OMF_initialize; 566 } 567 568 if (name == "performSelector" || name == "performSelectorInBackground" || 569 name == "performSelectorOnMainThread") 570 return OMF_performSelector; 571 572 // The other method families may begin with a prefix of underscores. 573 while (!name.empty() && name.front() == '_') 574 name = name.substr(1); 575 576 if (name.empty()) return OMF_None; 577 switch (name.front()) { 578 case 'a': 579 if (startsWithWord(name, "alloc")) return OMF_alloc; 580 break; 581 case 'c': 582 if (startsWithWord(name, "copy")) return OMF_copy; 583 break; 584 case 'i': 585 if (startsWithWord(name, "init")) return OMF_init; 586 break; 587 case 'm': 588 if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy; 589 break; 590 case 'n': 591 if (startsWithWord(name, "new")) return OMF_new; 592 break; 593 default: 594 break; 595 } 596 597 return OMF_None; 598 } 599 600 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) { 601 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 602 if (!first) return OIT_None; 603 604 StringRef name = first->getName(); 605 606 if (name.empty()) return OIT_None; 607 switch (name.front()) { 608 case 'a': 609 if (startsWithWord(name, "array")) return OIT_Array; 610 break; 611 case 'd': 612 if (startsWithWord(name, "default")) return OIT_ReturnsSelf; 613 if (startsWithWord(name, "dictionary")) return OIT_Dictionary; 614 break; 615 case 's': 616 if (startsWithWord(name, "shared")) return OIT_ReturnsSelf; 617 if (startsWithWord(name, "standard")) return OIT_Singleton; 618 break; 619 case 'i': 620 if (startsWithWord(name, "init")) return OIT_Init; 621 break; 622 default: 623 break; 624 } 625 return OIT_None; 626 } 627 628 ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) { 629 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 630 if (!first) return SFF_None; 631 632 StringRef name = first->getName(); 633 634 switch (name.front()) { 635 case 'a': 636 if (name == "appendFormat") return SFF_NSString; 637 break; 638 639 case 'i': 640 if (name == "initWithFormat") return SFF_NSString; 641 break; 642 643 case 'l': 644 if (name == "localizedStringWithFormat") return SFF_NSString; 645 break; 646 647 case 's': 648 if (name == "stringByAppendingFormat" || 649 name == "stringWithFormat") return SFF_NSString; 650 break; 651 } 652 return SFF_None; 653 } 654 655 namespace { 656 657 struct SelectorTableImpl { 658 llvm::FoldingSet<MultiKeywordSelector> Table; 659 llvm::BumpPtrAllocator Allocator; 660 }; 661 662 } // namespace 663 664 static SelectorTableImpl &getSelectorTableImpl(void *P) { 665 return *static_cast<SelectorTableImpl*>(P); 666 } 667 668 SmallString<64> 669 SelectorTable::constructSetterName(StringRef Name) { 670 SmallString<64> SetterName("set"); 671 SetterName += Name; 672 SetterName[3] = toUppercase(SetterName[3]); 673 return SetterName; 674 } 675 676 Selector 677 SelectorTable::constructSetterSelector(IdentifierTable &Idents, 678 SelectorTable &SelTable, 679 const IdentifierInfo *Name) { 680 IdentifierInfo *SetterName = 681 &Idents.get(constructSetterName(Name->getName())); 682 return SelTable.getUnarySelector(SetterName); 683 } 684 685 std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) { 686 StringRef Name = Sel.getNameForSlot(0); 687 assert(Name.startswith("set") && "invalid setter name"); 688 return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str(); 689 } 690 691 size_t SelectorTable::getTotalMemory() const { 692 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 693 return SelTabImpl.Allocator.getTotalMemory(); 694 } 695 696 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) { 697 if (nKeys < 2) 698 return Selector(IIV[0], nKeys); 699 700 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 701 702 // Unique selector, to guarantee there is one per name. 703 llvm::FoldingSetNodeID ID; 704 MultiKeywordSelector::Profile(ID, IIV, nKeys); 705 706 void *InsertPos = nullptr; 707 if (MultiKeywordSelector *SI = 708 SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos)) 709 return Selector(SI); 710 711 // MultiKeywordSelector objects are not allocated with new because they have a 712 // variable size array (for parameter types) at the end of them. 713 unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *); 714 MultiKeywordSelector *SI = 715 (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate( 716 Size, alignof(MultiKeywordSelector)); 717 new (SI) MultiKeywordSelector(nKeys, IIV); 718 SelTabImpl.Table.InsertNode(SI, InsertPos); 719 return Selector(SI); 720 } 721 722 SelectorTable::SelectorTable() { 723 Impl = new SelectorTableImpl(); 724 } 725 726 SelectorTable::~SelectorTable() { 727 delete &getSelectorTableImpl(Impl); 728 } 729 730 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) { 731 switch (Operator) { 732 case OO_None: 733 case NUM_OVERLOADED_OPERATORS: 734 return nullptr; 735 736 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 737 case OO_##Name: return Spelling; 738 #include "clang/Basic/OperatorKinds.def" 739 } 740 741 llvm_unreachable("Invalid OverloadedOperatorKind!"); 742 } 743 744 StringRef clang::getNullabilitySpelling(NullabilityKind kind, 745 bool isContextSensitive) { 746 switch (kind) { 747 case NullabilityKind::NonNull: 748 return isContextSensitive ? "nonnull" : "_Nonnull"; 749 750 case NullabilityKind::Nullable: 751 return isContextSensitive ? "nullable" : "_Nullable"; 752 753 case NullabilityKind::NullableResult: 754 assert(!isContextSensitive && 755 "_Nullable_result isn't supported as context-sensitive keyword"); 756 return "_Nullable_result"; 757 758 case NullabilityKind::Unspecified: 759 return isContextSensitive ? "null_unspecified" : "_Null_unspecified"; 760 } 761 llvm_unreachable("Unknown nullability kind."); 762 } 763
Indexes created Mon Jun 08 00:24:58 UTC 2026