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 tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const { 313 // We use a perfect hash function here involving the length of the keyword, 314 // the first and third character. For preprocessor ID's there are no 315 // collisions (if there were, the switch below would complain about duplicate 316 // case values). Note that this depends on 'if' being null terminated. 317 318 #define HASH(LEN, FIRST, THIRD) \ 319 (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31) 320 #define CASE(LEN, FIRST, THIRD, NAME) \ 321 case HASH(LEN, FIRST, THIRD): \ 322 return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME 323 324 unsigned Len = getLength(); 325 if (Len < 2) return tok::pp_not_keyword; 326 const char *Name = getNameStart(); 327 switch (HASH(Len, Name[0], Name[2])) { 328 default: return tok::pp_not_keyword; 329 CASE( 2, 'i', '\0', if); 330 CASE( 4, 'e', 'i', elif); 331 CASE( 4, 'e', 's', else); 332 CASE( 4, 'l', 'n', line); 333 CASE( 4, 's', 'c', sccs); 334 CASE( 5, 'e', 'd', endif); 335 CASE( 5, 'e', 'r', error); 336 CASE( 5, 'i', 'e', ident); 337 CASE( 5, 'i', 'd', ifdef); 338 CASE( 5, 'u', 'd', undef); 339 340 CASE( 6, 'a', 's', assert); 341 CASE( 6, 'd', 'f', define); 342 CASE( 6, 'i', 'n', ifndef); 343 CASE( 6, 'i', 'p', import); 344 CASE( 6, 'p', 'a', pragma); 345 346 CASE( 7, 'd', 'f', defined); 347 CASE( 7, 'e', 'i', elifdef); 348 CASE( 7, 'i', 'c', include); 349 CASE( 7, 'w', 'r', warning); 350 351 CASE( 8, 'e', 'i', elifndef); 352 CASE( 8, 'u', 'a', unassert); 353 CASE(12, 'i', 'c', include_next); 354 355 CASE(14, '_', 'p', __public_macro); 356 357 CASE(15, '_', 'p', __private_macro); 358 359 CASE(16, '_', 'i', __include_macros); 360 #undef CASE 361 #undef HASH 362 } 363 } 364 365 //===----------------------------------------------------------------------===// 366 // Stats Implementation 367 //===----------------------------------------------------------------------===// 368 369 /// PrintStats - Print statistics about how well the identifier table is doing 370 /// at hashing identifiers. 371 void IdentifierTable::PrintStats() const { 372 unsigned NumBuckets = HashTable.getNumBuckets(); 373 unsigned NumIdentifiers = HashTable.getNumItems(); 374 unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers; 375 unsigned AverageIdentifierSize = 0; 376 unsigned MaxIdentifierLength = 0; 377 378 // TODO: Figure out maximum times an identifier had to probe for -stats. 379 for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator 380 I = HashTable.begin(), E = HashTable.end(); I != E; ++I) { 381 unsigned IdLen = I->getKeyLength(); 382 AverageIdentifierSize += IdLen; 383 if (MaxIdentifierLength < IdLen) 384 MaxIdentifierLength = IdLen; 385 } 386 387 fprintf(stderr, "\n*** Identifier Table Stats:\n"); 388 fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers); 389 fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets); 390 fprintf(stderr, "Hash density (#identifiers per bucket): %f\n", 391 NumIdentifiers/(double)NumBuckets); 392 fprintf(stderr, "Ave identifier length: %f\n", 393 (AverageIdentifierSize/(double)NumIdentifiers)); 394 fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength); 395 396 // Compute statistics about the memory allocated for identifiers. 397 HashTable.getAllocator().PrintStats(); 398 } 399 400 //===----------------------------------------------------------------------===// 401 // SelectorTable Implementation 402 //===----------------------------------------------------------------------===// 403 404 unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) { 405 return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr()); 406 } 407 408 namespace clang { 409 410 /// One of these variable length records is kept for each 411 /// selector containing more than one keyword. We use a folding set 412 /// to unique aggregate names (keyword selectors in ObjC parlance). Access to 413 /// this class is provided strictly through Selector. 414 class alignas(IdentifierInfoAlignment) MultiKeywordSelector 415 : public detail::DeclarationNameExtra, 416 public llvm::FoldingSetNode { 417 MultiKeywordSelector(unsigned nKeys) : DeclarationNameExtra(nKeys) {} 418 419 public: 420 // Constructor for keyword selectors. 421 MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) 422 : DeclarationNameExtra(nKeys) { 423 assert((nKeys > 1) && "not a multi-keyword selector"); 424 425 // Fill in the trailing keyword array. 426 IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1); 427 for (unsigned i = 0; i != nKeys; ++i) 428 KeyInfo[i] = IIV[i]; 429 } 430 431 // getName - Derive the full selector name and return it. 432 std::string getName() const; 433 434 using DeclarationNameExtra::getNumArgs; 435 436 using keyword_iterator = IdentifierInfo *const *; 437 438 keyword_iterator keyword_begin() const { 439 return reinterpret_cast<keyword_iterator>(this + 1); 440 } 441 442 keyword_iterator keyword_end() const { 443 return keyword_begin() + getNumArgs(); 444 } 445 446 IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const { 447 assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index"); 448 return keyword_begin()[i]; 449 } 450 451 static void Profile(llvm::FoldingSetNodeID &ID, keyword_iterator ArgTys, 452 unsigned NumArgs) { 453 ID.AddInteger(NumArgs); 454 for (unsigned i = 0; i != NumArgs; ++i) 455 ID.AddPointer(ArgTys[i]); 456 } 457 458 void Profile(llvm::FoldingSetNodeID &ID) { 459 Profile(ID, keyword_begin(), getNumArgs()); 460 } 461 }; 462 463 } // namespace clang. 464 465 bool Selector::isKeywordSelector(ArrayRef<StringRef> Names) const { 466 assert(!Names.empty() && "must have >= 1 selector slots"); 467 if (getNumArgs() != Names.size()) 468 return false; 469 for (unsigned I = 0, E = Names.size(); I != E; ++I) { 470 if (getNameForSlot(I) != Names[I]) 471 return false; 472 } 473 return true; 474 } 475 476 bool Selector::isUnarySelector(StringRef Name) const { 477 return isUnarySelector() && getNameForSlot(0) == Name; 478 } 479 480 unsigned Selector::getNumArgs() const { 481 unsigned IIF = getIdentifierInfoFlag(); 482 if (IIF <= ZeroArg) 483 return 0; 484 if (IIF == OneArg) 485 return 1; 486 // We point to a MultiKeywordSelector. 487 MultiKeywordSelector *SI = getMultiKeywordSelector(); 488 return SI->getNumArgs(); 489 } 490 491 IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const { 492 if (getIdentifierInfoFlag() < MultiArg) { 493 assert(argIndex == 0 && "illegal keyword index"); 494 return getAsIdentifierInfo(); 495 } 496 497 // We point to a MultiKeywordSelector. 498 MultiKeywordSelector *SI = getMultiKeywordSelector(); 499 return SI->getIdentifierInfoForSlot(argIndex); 500 } 501 502 StringRef Selector::getNameForSlot(unsigned int argIndex) const { 503 IdentifierInfo *II = getIdentifierInfoForSlot(argIndex); 504 return II ? II->getName() : StringRef(); 505 } 506 507 std::string MultiKeywordSelector::getName() const { 508 SmallString<256> Str; 509 llvm::raw_svector_ostream OS(Str); 510 for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) { 511 if (*I) 512 OS << (*I)->getName(); 513 OS << ':'; 514 } 515 516 return std::string(OS.str()); 517 } 518 519 std::string Selector::getAsString() const { 520 if (InfoPtr == 0) 521 return "<null selector>"; 522 523 if (getIdentifierInfoFlag() < MultiArg) { 524 IdentifierInfo *II = getAsIdentifierInfo(); 525 526 if (getNumArgs() == 0) { 527 assert(II && "If the number of arguments is 0 then II is guaranteed to " 528 "not be null."); 529 return std::string(II->getName()); 530 } 531 532 if (!II) 533 return ":"; 534 535 return II->getName().str() + ":"; 536 } 537 538 // We have a multiple keyword selector. 539 return getMultiKeywordSelector()->getName(); 540 } 541 542 void Selector::print(llvm::raw_ostream &OS) const { 543 OS << getAsString(); 544 } 545 546 LLVM_DUMP_METHOD void Selector::dump() const { print(llvm::errs()); } 547 548 /// Interpreting the given string using the normal CamelCase 549 /// conventions, determine whether the given string starts with the 550 /// given "word", which is assumed to end in a lowercase letter. 551 static bool startsWithWord(StringRef name, StringRef word) { 552 if (name.size() < word.size()) return false; 553 return ((name.size() == word.size() || !isLowercase(name[word.size()])) && 554 name.startswith(word)); 555 } 556 557 ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) { 558 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 559 if (!first) return OMF_None; 560 561 StringRef name = first->getName(); 562 if (sel.isUnarySelector()) { 563 if (name == "autorelease") return OMF_autorelease; 564 if (name == "dealloc") return OMF_dealloc; 565 if (name == "finalize") return OMF_finalize; 566 if (name == "release") return OMF_release; 567 if (name == "retain") return OMF_retain; 568 if (name == "retainCount") return OMF_retainCount; 569 if (name == "self") return OMF_self; 570 if (name == "initialize") return OMF_initialize; 571 } 572 573 if (name == "performSelector" || name == "performSelectorInBackground" || 574 name == "performSelectorOnMainThread") 575 return OMF_performSelector; 576 577 // The other method families may begin with a prefix of underscores. 578 while (!name.empty() && name.front() == '_') 579 name = name.substr(1); 580 581 if (name.empty()) return OMF_None; 582 switch (name.front()) { 583 case 'a': 584 if (startsWithWord(name, "alloc")) return OMF_alloc; 585 break; 586 case 'c': 587 if (startsWithWord(name, "copy")) return OMF_copy; 588 break; 589 case 'i': 590 if (startsWithWord(name, "init")) return OMF_init; 591 break; 592 case 'm': 593 if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy; 594 break; 595 case 'n': 596 if (startsWithWord(name, "new")) return OMF_new; 597 break; 598 default: 599 break; 600 } 601 602 return OMF_None; 603 } 604 605 ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) { 606 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 607 if (!first) return OIT_None; 608 609 StringRef name = first->getName(); 610 611 if (name.empty()) return OIT_None; 612 switch (name.front()) { 613 case 'a': 614 if (startsWithWord(name, "array")) return OIT_Array; 615 break; 616 case 'd': 617 if (startsWithWord(name, "default")) return OIT_ReturnsSelf; 618 if (startsWithWord(name, "dictionary")) return OIT_Dictionary; 619 break; 620 case 's': 621 if (startsWithWord(name, "shared")) return OIT_ReturnsSelf; 622 if (startsWithWord(name, "standard")) return OIT_Singleton; 623 break; 624 case 'i': 625 if (startsWithWord(name, "init")) return OIT_Init; 626 break; 627 default: 628 break; 629 } 630 return OIT_None; 631 } 632 633 ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) { 634 IdentifierInfo *first = sel.getIdentifierInfoForSlot(0); 635 if (!first) return SFF_None; 636 637 StringRef name = first->getName(); 638 639 switch (name.front()) { 640 case 'a': 641 if (name == "appendFormat") return SFF_NSString; 642 break; 643 644 case 'i': 645 if (name == "initWithFormat") return SFF_NSString; 646 break; 647 648 case 'l': 649 if (name == "localizedStringWithFormat") return SFF_NSString; 650 break; 651 652 case 's': 653 if (name == "stringByAppendingFormat" || 654 name == "stringWithFormat") return SFF_NSString; 655 break; 656 } 657 return SFF_None; 658 } 659 660 namespace { 661 662 struct SelectorTableImpl { 663 llvm::FoldingSet<MultiKeywordSelector> Table; 664 llvm::BumpPtrAllocator Allocator; 665 }; 666 667 } // namespace 668 669 static SelectorTableImpl &getSelectorTableImpl(void *P) { 670 return *static_cast<SelectorTableImpl*>(P); 671 } 672 673 SmallString<64> 674 SelectorTable::constructSetterName(StringRef Name) { 675 SmallString<64> SetterName("set"); 676 SetterName += Name; 677 SetterName[3] = toUppercase(SetterName[3]); 678 return SetterName; 679 } 680 681 Selector 682 SelectorTable::constructSetterSelector(IdentifierTable &Idents, 683 SelectorTable &SelTable, 684 const IdentifierInfo *Name) { 685 IdentifierInfo *SetterName = 686 &Idents.get(constructSetterName(Name->getName())); 687 return SelTable.getUnarySelector(SetterName); 688 } 689 690 std::string SelectorTable::getPropertyNameFromSetterSelector(Selector Sel) { 691 StringRef Name = Sel.getNameForSlot(0); 692 assert(Name.startswith("set") && "invalid setter name"); 693 return (Twine(toLowercase(Name[3])) + Name.drop_front(4)).str(); 694 } 695 696 size_t SelectorTable::getTotalMemory() const { 697 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 698 return SelTabImpl.Allocator.getTotalMemory(); 699 } 700 701 Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) { 702 if (nKeys < 2) 703 return Selector(IIV[0], nKeys); 704 705 SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl); 706 707 // Unique selector, to guarantee there is one per name. 708 llvm::FoldingSetNodeID ID; 709 MultiKeywordSelector::Profile(ID, IIV, nKeys); 710 711 void *InsertPos = nullptr; 712 if (MultiKeywordSelector *SI = 713 SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos)) 714 return Selector(SI); 715 716 // MultiKeywordSelector objects are not allocated with new because they have a 717 // variable size array (for parameter types) at the end of them. 718 unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *); 719 MultiKeywordSelector *SI = 720 (MultiKeywordSelector *)SelTabImpl.Allocator.Allocate( 721 Size, alignof(MultiKeywordSelector)); 722 new (SI) MultiKeywordSelector(nKeys, IIV); 723 SelTabImpl.Table.InsertNode(SI, InsertPos); 724 return Selector(SI); 725 } 726 727 SelectorTable::SelectorTable() { 728 Impl = new SelectorTableImpl(); 729 } 730 731 SelectorTable::~SelectorTable() { 732 delete &getSelectorTableImpl(Impl); 733 } 734 735 const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) { 736 switch (Operator) { 737 case OO_None: 738 case NUM_OVERLOADED_OPERATORS: 739 return nullptr; 740 741 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 742 case OO_##Name: return Spelling; 743 #include "clang/Basic/OperatorKinds.def" 744 } 745 746 llvm_unreachable("Invalid OverloadedOperatorKind!"); 747 } 748 749 StringRef clang::getNullabilitySpelling(NullabilityKind kind, 750 bool isContextSensitive) { 751 switch (kind) { 752 case NullabilityKind::NonNull: 753 return isContextSensitive ? "nonnull" : "_Nonnull"; 754 755 case NullabilityKind::Nullable: 756 return isContextSensitive ? "nullable" : "_Nullable"; 757 758 case NullabilityKind::NullableResult: 759 assert(!isContextSensitive && 760 "_Nullable_result isn't supported as context-sensitive keyword"); 761 return "_Nullable_result"; 762 763 case NullabilityKind::Unspecified: 764 return isContextSensitive ? "null_unspecified" : "_Null_unspecified"; 765 } 766 llvm_unreachable("Unknown nullability kind."); 767 } 768