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 KEYSYCL = 0x1000000, 111 KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX20, 112 KEYALL = (0x1ffffff & ~KEYNOMS18 & 113 ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude. 114 }; 115 116 /// How a keyword is treated in the selected standard. 117 enum KeywordStatus { 118 KS_Disabled, // Disabled 119 KS_Extension, // Is an extension 120 KS_Enabled, // Enabled 121 KS_Future // Is a keyword in future standard 122 }; 123 124 } // namespace 125 126 /// Translates flags as specified in TokenKinds.def into keyword status 127 /// in the given language standard. 128 static KeywordStatus getKeywordStatus(const LangOptions &LangOpts, 129 unsigned Flags) { 130 if (Flags == KEYALL) return KS_Enabled; 131 if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled; 132 if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled; 133 if (LangOpts.CPlusPlus20 && (Flags & KEYCXX20)) return KS_Enabled; 134 if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled; 135 if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension; 136 if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension; 137 if (LangOpts.MSVCCompat && (Flags & KEYMSCOMPAT)) return KS_Enabled; 138 if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension; 139 if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled; 140 if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled; 141 if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled; 142 if (LangOpts.Char8 && (Flags & CHAR8SUPPORT)) return KS_Enabled; 143 if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled; 144 if (LangOpts.ZVector && (Flags & KEYZVECTOR)) return KS_Enabled; 145 if (LangOpts.OpenCL && !LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLC)) 146 return KS_Enabled; 147 if (LangOpts.OpenCLCPlusPlus && (Flags & KEYOPENCLCXX)) return KS_Enabled; 148 if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled; 149 if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled; 150 // We treat bridge casts as objective-C keywords so we can warn on them 151 // in non-arc mode. 152 if (LangOpts.ObjC && (Flags & KEYOBJC)) return KS_Enabled; 153 if (LangOpts.CPlusPlus20 && (Flags & KEYCONCEPTS)) return KS_Enabled; 154 if (LangOpts.Coroutines && (Flags & KEYCOROUTINES)) return KS_Enabled; 155 if (LangOpts.ModulesTS && (Flags & KEYMODULES)) return KS_Enabled; 156 if (LangOpts.CPlusPlus && (Flags & KEYALLCXX)) return KS_Future; 157 if (LangOpts.CPlusPlus && !LangOpts.CPlusPlus20 && (Flags & CHAR8SUPPORT)) 158 return KS_Future; 159 if (LangOpts.isSYCL() && (Flags & KEYSYCL)) 160 return KS_Enabled; 161 return KS_Disabled; 162 } 163 164 /// AddKeyword - This method is used to associate a token ID with specific 165 /// identifiers because they are language keywords. This causes the lexer to 166 /// automatically map matching identifiers to specialized token codes. 167 static void AddKeyword(StringRef Keyword, 168 tok::TokenKind TokenCode, unsigned Flags, 169 const LangOptions &LangOpts, IdentifierTable &Table) { 170 KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags); 171 172 // Don't add this keyword under MSVCCompat. 173 if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) && 174 !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015)) 175 return; 176 177 // Don't add this keyword under OpenCL. 178 if (LangOpts.OpenCL && (Flags & KEYNOOPENCL)) 179 return; 180 181 // Don't add this keyword if disabled in this language. 182 if (AddResult == KS_Disabled) return; 183 184 IdentifierInfo &Info = 185 Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode); 186 Info.setIsExtensionToken(AddResult == KS_Extension); 187 Info.setIsFutureCompatKeyword(AddResult == KS_Future); 188 } 189 190 /// AddCXXOperatorKeyword - Register a C++ operator keyword alternative 191 /// representations. 192 static void AddCXXOperatorKeyword(StringRef Keyword, 193 tok::TokenKind TokenCode, 194 IdentifierTable &Table) { 195 IdentifierInfo &Info = Table.get(Keyword, TokenCode); 196 Info.setIsCPlusPlusOperatorKeyword(); 197 } 198 199 /// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector" 200 /// or "property". 201 static void AddObjCKeyword(StringRef Name, 202 tok::ObjCKeywordKind ObjCID, 203 IdentifierTable &Table) { 204 Table.get(Name).setObjCKeywordID(ObjCID); 205 } 206 207 /// AddKeywords - Add all keywords to the symbol table. 208 /// 209 void IdentifierTable::AddKeywords(const LangOptions &LangOpts) { 210 // Add keywords and tokens for the current language. 211 #define KEYWORD(NAME, FLAGS) \ 212 AddKeyword(StringRef(#NAME), tok::kw_ ## NAME, \ 213 FLAGS, LangOpts, *this); 214 #define ALIAS(NAME, TOK, FLAGS) \ 215 AddKeyword(StringRef(NAME), tok::kw_ ## TOK, \ 216 FLAGS, LangOpts, *this); 217 #define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \ 218 if (LangOpts.CXXOperatorNames) \ 219 AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this); 220 #define OBJC_AT_KEYWORD(NAME) \ 221 if (LangOpts.ObjC) \ 222 AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this); 223 #define TESTING_KEYWORD(NAME, FLAGS) 224 #include "clang/Basic/TokenKinds.def" 225 226 if (LangOpts.ParseUnknownAnytype) 227 AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL, 228 LangOpts, *this); 229 230 if (LangOpts.DeclSpecKeyword) 231 AddKeyword("__declspec", tok::kw___declspec, KEYALL, LangOpts, *this); 232 233 if (LangOpts.IEEE128) 234 AddKeyword("__ieee128", tok::kw___float128, KEYALL, LangOpts, *this); 235 236 // Add the 'import' contextual keyword. 237 get("import").setModulesImport(true); 238 } 239 240 /// Checks if the specified token kind represents a keyword in the 241 /// specified language. 242 /// \returns Status of the keyword in the language. 243 static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts, 244 tok::TokenKind K) { 245 switch (K) { 246 #define KEYWORD(NAME, FLAGS) \ 247 case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS); 248 #include "clang/Basic/TokenKinds.def" 249 default: return KS_Disabled; 250 } 251 } 252 253 /// Returns true if the identifier represents a keyword in the 254 /// specified language. 255 bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) const { 256 switch (getTokenKwStatus(LangOpts, getTokenID())) { 257 case KS_Enabled: 258 case KS_Extension: 259 return true; 260 default: 261 return false; 262 } 263 } 264 265 /// Returns true if the identifier represents a C++ keyword in the 266 /// specified language. 267 bool IdentifierInfo::isCPlusPlusKeyword(const LangOptions &LangOpts) const { 268 if (!LangOpts.CPlusPlus || !isKeyword(LangOpts)) 269 return false; 270 // This is a C++ keyword if this identifier is not a keyword when checked 271 // using LangOptions without C++ support. 272 LangOptions LangOptsNoCPP = LangOpts; 273 LangOptsNoCPP.CPlusPlus = false; 274 LangOptsNoCPP.CPlusPlus11 = false; 275 LangOptsNoCPP.CPlusPlus20 = false; 276 return !isKeyword(LangOptsNoCPP); 277 } 278 279 ReservedIdentifierStatus 280 IdentifierInfo::isReserved(const LangOptions &LangOpts) const { 281 StringRef Name = getName(); 282 283 // '_' is a reserved identifier, but its use is so common (e.g. to store 284 // ignored values) that we don't warn on it. 285 if (Name.size() <= 1) 286 return ReservedIdentifierStatus::NotReserved; 287 288 // [lex.name] p3 289 if (Name[0] == '_') { 290 291 // Each name that begins with an underscore followed by an uppercase letter 292 // or another underscore is reserved. 293 if (Name[1] == '_') 294 return ReservedIdentifierStatus::StartsWithDoubleUnderscore; 295 296 if ('A' <= Name[1] && Name[1] <= 'Z') 297 return ReservedIdentifierStatus:: 298 StartsWithUnderscoreFollowedByCapitalLetter; 299 300 // This is a bit misleading: it actually means it's only reserved if we're 301 // at global scope because it starts with an underscore. 302 return ReservedIdentifierStatus::StartsWithUnderscoreAtGlobalScope; 303 } 304 305 // Each name that contains a double underscore (__) is reserved. 306 if (LangOpts.CPlusPlus && Name.contains("__")) 307 return ReservedIdentifierStatus::ContainsDoubleUnderscore; 308 309 return ReservedIdentifierStatus::NotReserved; 310 } 311 312 StringRef IdentifierInfo::deuglifiedName() const { 313 StringRef Name = getName(); 314 if (Name.size() >= 2 && Name.front() == '_' && 315 (Name[1] == '_' || (Name[1] >= 'A' && Name[1] <= 'Z'))) 316 return Name.ltrim('_'); 317 return Name; 318 } 319 320 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { 321 // We use a perfect hash function here involving the length of the keyword, 322 // the first and third character. For preprocessor ID's there are no 323 // collisions (if there were, the switch below would complain about duplicate 324 // case values). Note that this depends on 'if' being null terminated. 325 326 #define HASH(LEN, FIRST, THIRD) \ 327 (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) 328 #define CASE(LEN, FIRST, THIRD, NAME) \ 329 case HASH(LEN, FIRST, THIRD): \ 330 return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME 331 332 unsigned Len = getLength(); 333 if (Len < 2) return tok::pp_not_keyword; 334 const char *Name = getNameStart(); 335 switch (HASH(Len, Name[0], Name[2])) { 336 default: return tok::pp_not_keyword; 337 CASE( 2, 'i', '\0', if); 338 CASE( 4, 'e', 'i', elif); 339 CASE( 4, 'e', 's', else); 340 CASE( 4, 'l', 'n', line); 341 CASE( 4, 's', 'c', sccs); 342 CASE( 5, 'e', 'd', endif); 343 CASE( 5, 'e', 'r', error); 344 CASE( 5, 'i', 'e', ident); 345 CASE( 5, 'i', 'd', ifdef); 346 CASE( 5, 'u', 'd', undef); 347 348 CASE( 6, 'a', 's', assert); 349 CASE( 6, 'd', 'f', define); 350 CASE( 6, 'i', 'n', ifndef); 351 CASE( 6, 'i', 'p', import); 352 CASE( 6, 'p', 'a', pragma); 353 354 CASE( 7, 'd', 'f', defined); 355 CASE( 7, 'e', 'i', elifdef); 356 CASE( 7, 'i', 'c', include); 357 CASE( 7, 'w', 'r', warning); 358 359 CASE( 8, 'e', 'i', elifndef); 360 CASE( 8, 'u', 'a', unassert); 361 CASE(12, 'i', 'c', include_next); 362 363 CASE(14, '_', 'p', __public_macro); 364 365 CASE(15, '_', 'p', __private_macro); 366 367 CASE(16, '_', 'i', __include_macros); 368 #undef CASE 369 #undef HASH 370 } 371 } 372 373 //===----------------------------------------------------------------------===// 374 // Stats Implementation 375 //===----------------------------------------------------------------------===// 376 377 /// PrintStats - Print statistics about how well the identifier table is doing 378 /// at hashing identifiers. 379 void IdentifierTable::PrintStats() const { 380 unsigned NumBuckets = HashTable.getNumBuckets(); 381 unsigned NumIdentifiers = HashTable.getNumItems(); 382 unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers; 383 unsigned AverageIdentifierSize = 0; 384 unsigned MaxIdentifierLength = 0; 385 386 // TODO: Figure out maximum times an identifier had to probe for -stats. 387 for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator 388 I = HashTable.begin(), E = HashTable.end(); I != E; ++I) { 389 unsigned IdLen = I->getKeyLength(); 390 AverageIdentifierSize += IdLen; 391 if (MaxIdentifierLength < IdLen) 392 MaxIdentifierLength = IdLen; 393 } 394 395 fprintf(stderr, "\n*** Identifier Table Stats:\n"); 396 fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers); 397 fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets); 398 fprintf(stderr, "Hash density (#identifiers per bucket): %f\n", 399 NumIdentifiers/(double)NumBuckets); 400 fprintf(stderr, "Ave identifier length: %f\n", 401 (AverageIdentifierSize/(double)NumIdentifiers)); 402 fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength); 403 404 // Compute statistics about the memory allocated for identifiers. 405 HashTable.getAllocator().PrintStats(); 406 } 407 408 //===----------------------------------------------------------------------===// 409 // SelectorTable Implementation 410 //===----------------------------------------------------------------------===// 411 412 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 413 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 414 } 415 416 namespace clang { 417 418 /// One of these variable length records is kept for each 419 /// selector containing more than one keyword. We use a folding set 420 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to 421 /// this class is provided strictly through Selector. 422 class alignas(IdentifierInfoAlignment) MultiKeywordSelector 423 : public detail::DeclarationNameExtra, 424 public llvm::FoldingSetNode { 425 MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {} 426 427 public: 428 // Constructor for keyword selectors. 429 MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) 430 : DeclarationNameExtra(nKeys) { 431 assert((nKeys > 1) && "not a multi-keyword selector"); 432 433 // Fill in the trailing keyword array. 434 IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1); 435 for (unsigned i = 0; i != nKeys; ++i) 436 KeyInfo[i] = IIV[i]; 437 } 438 439 // getName - Derive the full selector name and return it. 440 std::string getName() const; 441 442 using DeclarationNameExtra::getNumArgs; 443 444 using keyword_iterator = IdentifierInfo *const *; 445 446 keyword_iterator keyword_begin() const { 447 return reinterpret_cast<keyword_iterator>(this + 1); 448 } 449 450 keyword_iterator keyword_end() const { 451 return keyword_begin() + getNumArgs(); 452 } 453 454 IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const { 455 assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index"); 456 return keyword_begin()[i]; 457 } 458 459 static void Profile(llvm::FoldingSetNodeID &ID, keyword_iterator ArgTys, 460 unsigned NumArgs) { 461 ID.AddInteger(NumArgs); 462 for (unsigned i = 0; i != NumArgs; ++i) 463 ID.AddPointer(ArgTys[i]); 464 } 465 466 void Profile(llvm::FoldingSetNodeID &ID) { 467 Profile(ID, keyword_begin(), getNumArgs()); 468 } 469 }; 470 471 } // namespace clang. 472 473 bool Selector::isKeywordSelector(ArrayRef<StringRef> Names) const { 474 assert(!Names.empty() && "must have >= 1 selector slots"); 475 if (getNumArgs() != Names.size()) 476 return false; 477 for (unsigned I = 0, E = Names.size(); I != E; ++I) { 478 if (getNameForSlot(I) != Names[I]) 479 return false; 480 } 481 return true; 482 } 483 484 bool Selector::isUnarySelector(StringRef Name) const { 485 return isUnarySelector() && getNameForSlot(0) == Name; 486 } 487 488 unsigned Selector::getNumArgs() const { 489 unsigned IIF = getIdentifierInfoFlag(); 490 if (IIF <= ZeroArg) 491 return 0; 492 if (IIF == OneArg) 493 return 1; 494 // We point to a MultiKeywordSelector. 495 MultiKeywordSelector *SI = getMultiKeywordSelector(); 496 return SI->getNumArgs(); 497 } 498 499 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const { 500 if (getIdentifierInfoFlag() < MultiArg) { 501 assert(argIndex == 0 && "illegal keyword index"); 502 return getAsIdentifierInfo(); 503 } 504 505 // We point to a MultiKeywordSelector. 506 MultiKeywordSelector *SI = getMultiKeywordSelector(); 507 return SI->getIdentifierInfoForSlot(argIndex); 508 } 509 510 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 511 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 512 return II ? II->getName() : StringRef(); 513 } 514 515 std::string MultiKeywordSelector::getName() const { 516 SmallString<256> Str; 517 llvm::raw_svector_ostream OS(Str); 518 for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) { 519 if (*I) 520 OS << (*I)->getName(); 521 OS << ':'; 522 } 523 524 return std::string(OS.str()); 525 } 526 527 std::string Selector::getAsString() const { 528 if (InfoPtr == 0) 529 return "<null selector>"; 530 531 if (getIdentifierInfoFlag() < MultiArg) { 532 IdentifierInfo *II = getAsIdentifierInfo(); 533 534 if (getNumArgs() == 0) { 535 assert(II && "If the number of arguments is 0 then II is guaranteed to " 536 "not be null."); 537 return std::string(II->getName()); 538 } 539 540 if (!II) 541 return ":"; 542 543 return II->getName().str() + ":"; 544 } 545 546 // We have a multiple keyword selector. 547 return getMultiKeywordSelector()->getName(); 548 } 549 550 void Selector::print(llvm::raw_ostream &OS) const { 551 OS << getAsString(); 552 } 553 554 LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); } 555 556 /// Interpreting the given string using the normal CamelCase 557 /// conventions, determine whether the given string starts with the 558 /// given "word", which is assumed to end in a lowercase letter. 559 static bool startsWithWord(StringRef name, StringRef word) { 560 if (name.size() < word.size()) return false; 561 return ((name.size() == word.size() || !isLowercase(name[word.size()])) && 562 name.startswith(word)); 563 } 564 565 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) { 566 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 567 if (!first) return OMF_None; 568 569 StringRef name = first->getName(); 570 if (sel.isUnarySelector()) { 571 if (name == "autorelease") return OMF_autorelease; 572 if (name == "dealloc") return OMF_dealloc; 573 if (name == "finalize") return OMF_finalize; 574 if (name == "release") return OMF_release; 575 if (name == "retain") return OMF_retain; 576 if (name == "retainCount") return OMF_retainCount; 577 if (name == "self") return OMF_self; 578 if (name == "initialize") return OMF_initialize; 579 } 580 581 if (name == "performSelector" || name == "performSelectorInBackground" || 582 name == "performSelectorOnMainThread") 583 return OMF_performSelector; 584 585 // The other method families may begin with a prefix of underscores. 586 while (!name.empty() && name.front() == '_') 587 name = name.substr(1); 588 589 if (name.empty()) return OMF_None; 590 switch (name.front()) { 591 case 'a': 592 if (startsWithWord(name, "alloc")) return OMF_alloc; 593 break; 594 case 'c': 595 if (startsWithWord(name, "copy")) return OMF_copy; 596 break; 597 case 'i': 598 if (startsWithWord(name, "init")) return OMF_init; 599 break; 600 case 'm': 601 if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy; 602 break; 603 case 'n': 604 if (startsWithWord(name, "new")) return OMF_new; 605 break; 606 default: 607 break; 608 } 609 610 return OMF_None; 611 } 612 613 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) { 614 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 615 if (!first) return OIT_None; 616 617 StringRef name = first->getName(); 618 619 if (name.empty()) return OIT_None; 620 switch (name.front()) { 621 case 'a': 622 if (startsWithWord(name, "array")) return OIT_Array; 623 break; 624 case 'd': 625 if (startsWithWord(name, "default")) return OIT_ReturnsSelf; 626 if (startsWithWord(name, "dictionary")) return OIT_Dictionary; 627 break; 628 case 's': 629 if (startsWithWord(name, "shared")) return OIT_ReturnsSelf; 630 if (startsWithWord(name, "standard")) return OIT_Singleton; 631 break; 632 case 'i': 633 if (startsWithWord(name, "init")) return OIT_Init; 634 break; 635 default: 636 break; 637 } 638 return OIT_None; 639 } 640 641 ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) { 642 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 643 if (!first) return SFF_None; 644 645 StringRef name = first->getName(); 646 647 switch (name.front()) { 648 case 'a': 649 if (name == "appendFormat") return SFF_NSString; 650 break; 651 652 case 'i': 653 if (name == "initWithFormat") return SFF_NSString; 654 break; 655 656 case 'l': 657 if (name == "localizedStringWithFormat") return SFF_NSString; 658 break; 659 660 case 's': 661 if (name == "stringByAppendingFormat" || 662 name == "stringWithFormat") return SFF_NSString; 663 break; 664 } 665 return SFF_None; 666 } 667 668 namespace { 669 670 struct SelectorTableImpl { 671 llvm::FoldingSet<MultiKeywordSelector> Table; 672 llvm::BumpPtrAllocator Allocator; 673 }; 674 675 } // namespace 676 677 static SelectorTableImpl &getSelectorTableImpl(void *P) { 678 return *static_cast<SelectorTableImpl*>(P); 679 } 680 681 SmallString<64> 682 SelectorTable::constructSetterName(StringRef Name) { 683 SmallString<64> SetterName("set"); 684 SetterName += Name; 685 SetterName[3] = toUppercase(SetterName[3]); 686 return SetterName; 687 } 688 689 Selector 690 SelectorTable::constructSetterSelector(IdentifierTable &Idents, 691 SelectorTable &SelTable, 692 const IdentifierInfo *Name) { 693 IdentifierInfo *SetterName = 694 &Idents.get(constructSetterName(Name->getName())); 695 return SelTable.getUnarySelector(SetterName); 696 } 697 698 std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) { 699 StringRef Name = Sel.getNameForSlot(0); 700 assert(Name.startswith("set") && "invalid setter name"); 701 return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str(); 702 } 703 704 size_t SelectorTable::getTotalMemory() const { 705 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 706 return SelTabImpl.Allocator.getTotalMemory(); 707 } 708 709 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) { 710 if (nKeys < 2) 711 return Selector(IIV[0], nKeys); 712 713 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 714 715 // Unique selector, to guarantee there is one per name. 716 llvm::FoldingSetNodeID ID; 717 MultiKeywordSelector::Profile(ID, IIV, nKeys); 718 719 void *InsertPos = nullptr; 720 if (MultiKeywordSelector *SI = 721 SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos)) 722 return Selector(SI); 723 724 // MultiKeywordSelector objects are not allocated with new because they have a 725 // variable size array (for parameter types) at the end of them. 726 unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *); 727 MultiKeywordSelector *SI = 728 (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate( 729 Size, alignof(MultiKeywordSelector)); 730 new (SI) MultiKeywordSelector(nKeys, IIV); 731 SelTabImpl.Table.InsertNode(SI, InsertPos); 732 return Selector(SI); 733 } 734 735 SelectorTable::SelectorTable() { 736 Impl = new SelectorTableImpl(); 737 } 738 739 SelectorTable::~SelectorTable() { 740 delete &getSelectorTableImpl(Impl); 741 } 742 743 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) { 744 switch (Operator) { 745 case OO_None: 746 case NUM_OVERLOADED_OPERATORS: 747 return nullptr; 748 749 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 750 case OO_##Name: return Spelling; 751 #include "clang/Basic/OperatorKinds.def" 752 } 753 754 llvm_unreachable("Invalid OverloadedOperatorKind!"); 755 } 756 757 StringRef clang::getNullabilitySpelling(NullabilityKind kind, 758 bool isContextSensitive) { 759 switch (kind) { 760 case NullabilityKind::NonNull: 761 return isContextSensitive ? "nonnull" : "_Nonnull"; 762 763 case NullabilityKind::Nullable: 764 return isContextSensitive ? "nullable" : "_Nullable"; 765 766 case NullabilityKind::NullableResult: 767 assert(!isContextSensitive && 768 "_Nullable_result isn't supported as context-sensitive keyword"); 769 return "_Nullable_result"; 770 771 case NullabilityKind::Unspecified: 772 return isContextSensitive ? "null_unspecified" : "_Null_unspecified"; 773 } 774 llvm_unreachable("Unknown nullability kind."); 775 } 776