1 //===--- SemaDeclAttr.cpp - Declaration Attribute Handling ----------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements decl-related attribute processing. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Sema/SemaInternal.h" 15 #include "TargetAttributesSema.h" 16 #include "clang/AST/ASTContext.h" 17 #include "clang/AST/DeclCXX.h" 18 #include "clang/AST/DeclTemplate.h" 19 #include "clang/AST/DeclObjC.h" 20 #include "clang/AST/Expr.h" 21 #include "clang/Basic/SourceManager.h" 22 #include "clang/Basic/TargetInfo.h" 23 #include "clang/Sema/DeclSpec.h" 24 #include "clang/Sema/DelayedDiagnostic.h" 25 #include "clang/Sema/Lookup.h" 26 #include "llvm/ADT/StringExtras.h" 27 using namespace clang; 28 using namespace sema; 29 30 /// These constants match the enumerated choices of 31 /// warn_attribute_wrong_decl_type and err_attribute_wrong_decl_type. 32 enum AttributeDeclKind { 33 ExpectedFunction, 34 ExpectedUnion, 35 ExpectedVariableOrFunction, 36 ExpectedFunctionOrMethod, 37 ExpectedParameter, 38 ExpectedParameterOrMethod, 39 ExpectedFunctionMethodOrBlock, 40 ExpectedClassOrVirtualMethod, 41 ExpectedFunctionMethodOrParameter, 42 ExpectedClass, 43 ExpectedVirtualMethod, 44 ExpectedClassMember, 45 ExpectedVariable, 46 ExpectedMethod, 47 ExpectedVariableFunctionOrLabel, 48 ExpectedFieldOrGlobalVar 49 }; 50 51 //===----------------------------------------------------------------------===// 52 // Helper functions 53 //===----------------------------------------------------------------------===// 54 55 static const FunctionType *getFunctionType(const Decl *D, 56 bool blocksToo = true) { 57 QualType Ty; 58 if (const ValueDecl *decl = dyn_cast<ValueDecl>(D)) 59 Ty = decl->getType(); 60 else if (const FieldDecl *decl = dyn_cast<FieldDecl>(D)) 61 Ty = decl->getType(); 62 else if (const TypedefNameDecl* decl = dyn_cast<TypedefNameDecl>(D)) 63 Ty = decl->getUnderlyingType(); 64 else 65 return 0; 66 67 if (Ty->isFunctionPointerType()) 68 Ty = Ty->getAs<PointerType>()->getPointeeType(); 69 else if (blocksToo && Ty->isBlockPointerType()) 70 Ty = Ty->getAs<BlockPointerType>()->getPointeeType(); 71 72 return Ty->getAs<FunctionType>(); 73 } 74 75 // FIXME: We should provide an abstraction around a method or function 76 // to provide the following bits of information. 77 78 /// isFunction - Return true if the given decl has function 79 /// type (function or function-typed variable). 80 static bool isFunction(const Decl *D) { 81 return getFunctionType(D, false) != NULL; 82 } 83 84 /// isFunctionOrMethod - Return true if the given decl has function 85 /// type (function or function-typed variable) or an Objective-C 86 /// method. 87 static bool isFunctionOrMethod(const Decl *D) { 88 return isFunction(D)|| isa<ObjCMethodDecl>(D); 89 } 90 91 /// isFunctionOrMethodOrBlock - Return true if the given decl has function 92 /// type (function or function-typed variable) or an Objective-C 93 /// method or a block. 94 static bool isFunctionOrMethodOrBlock(const Decl *D) { 95 if (isFunctionOrMethod(D)) 96 return true; 97 // check for block is more involved. 98 if (const VarDecl *V = dyn_cast<VarDecl>(D)) { 99 QualType Ty = V->getType(); 100 return Ty->isBlockPointerType(); 101 } 102 return isa<BlockDecl>(D); 103 } 104 105 /// Return true if the given decl has a declarator that should have 106 /// been processed by Sema::GetTypeForDeclarator. 107 static bool hasDeclarator(const Decl *D) { 108 // In some sense, TypedefDecl really *ought* to be a DeclaratorDecl. 109 return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) || isa<TypedefNameDecl>(D) || 110 isa<ObjCPropertyDecl>(D); 111 } 112 113 /// hasFunctionProto - Return true if the given decl has a argument 114 /// information. This decl should have already passed 115 /// isFunctionOrMethod or isFunctionOrMethodOrBlock. 116 static bool hasFunctionProto(const Decl *D) { 117 if (const FunctionType *FnTy = getFunctionType(D)) 118 return isa<FunctionProtoType>(FnTy); 119 else { 120 assert(isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D)); 121 return true; 122 } 123 } 124 125 /// getFunctionOrMethodNumArgs - Return number of function or method 126 /// arguments. It is an error to call this on a K&R function (use 127 /// hasFunctionProto first). 128 static unsigned getFunctionOrMethodNumArgs(const Decl *D) { 129 if (const FunctionType *FnTy = getFunctionType(D)) 130 return cast<FunctionProtoType>(FnTy)->getNumArgs(); 131 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) 132 return BD->getNumParams(); 133 return cast<ObjCMethodDecl>(D)->param_size(); 134 } 135 136 static QualType getFunctionOrMethodArgType(const Decl *D, unsigned Idx) { 137 if (const FunctionType *FnTy = getFunctionType(D)) 138 return cast<FunctionProtoType>(FnTy)->getArgType(Idx); 139 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) 140 return BD->getParamDecl(Idx)->getType(); 141 142 return cast<ObjCMethodDecl>(D)->param_begin()[Idx]->getType(); 143 } 144 145 static QualType getFunctionOrMethodResultType(const Decl *D) { 146 if (const FunctionType *FnTy = getFunctionType(D)) 147 return cast<FunctionProtoType>(FnTy)->getResultType(); 148 return cast<ObjCMethodDecl>(D)->getResultType(); 149 } 150 151 static bool isFunctionOrMethodVariadic(const Decl *D) { 152 if (const FunctionType *FnTy = getFunctionType(D)) { 153 const FunctionProtoType *proto = cast<FunctionProtoType>(FnTy); 154 return proto->isVariadic(); 155 } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) 156 return BD->isVariadic(); 157 else { 158 return cast<ObjCMethodDecl>(D)->isVariadic(); 159 } 160 } 161 162 static bool isInstanceMethod(const Decl *D) { 163 if (const CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) 164 return MethodDecl->isInstance(); 165 return false; 166 } 167 168 static inline bool isNSStringType(QualType T, ASTContext &Ctx) { 169 const ObjCObjectPointerType *PT = T->getAs<ObjCObjectPointerType>(); 170 if (!PT) 171 return false; 172 173 ObjCInterfaceDecl *Cls = PT->getObjectType()->getInterface(); 174 if (!Cls) 175 return false; 176 177 IdentifierInfo* ClsName = Cls->getIdentifier(); 178 179 // FIXME: Should we walk the chain of classes? 180 return ClsName == &Ctx.Idents.get("NSString") || 181 ClsName == &Ctx.Idents.get("NSMutableString"); 182 } 183 184 static inline bool isCFStringType(QualType T, ASTContext &Ctx) { 185 const PointerType *PT = T->getAs<PointerType>(); 186 if (!PT) 187 return false; 188 189 const RecordType *RT = PT->getPointeeType()->getAs<RecordType>(); 190 if (!RT) 191 return false; 192 193 const RecordDecl *RD = RT->getDecl(); 194 if (RD->getTagKind() != TTK_Struct) 195 return false; 196 197 return RD->getIdentifier() == &Ctx.Idents.get("__CFString"); 198 } 199 200 /// \brief Check if the attribute has exactly as many args as Num. May 201 /// output an error. 202 static bool checkAttributeNumArgs(Sema &S, const AttributeList &Attr, 203 unsigned int Num) { 204 if (Attr.getNumArgs() != Num) { 205 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Num; 206 return false; 207 } 208 209 return true; 210 } 211 212 213 /// \brief Check if the attribute has at least as many args as Num. May 214 /// output an error. 215 static bool checkAttributeAtLeastNumArgs(Sema &S, const AttributeList &Attr, 216 unsigned int Num) { 217 if (Attr.getNumArgs() < Num) { 218 S.Diag(Attr.getLoc(), diag::err_attribute_too_few_arguments) << Num; 219 return false; 220 } 221 222 return true; 223 } 224 225 /// 226 /// \brief Check if passed in Decl is a field or potentially shared global var 227 /// \return true if the Decl is a field or potentially shared global variable 228 /// 229 static bool mayBeSharedVariable(const Decl *D) { 230 if (isa<FieldDecl>(D)) 231 return true; 232 if (const VarDecl *vd = dyn_cast<VarDecl>(D)) 233 return (vd->hasGlobalStorage() && !(vd->isThreadSpecified())); 234 235 return false; 236 } 237 238 /// \brief Check if the passed-in expression is of type int or bool. 239 static bool isIntOrBool(Expr *Exp) { 240 QualType QT = Exp->getType(); 241 return QT->isBooleanType() || QT->isIntegerType(); 242 } 243 244 /// 245 /// \brief Check if passed in Decl is a pointer type. 246 /// Note that this function may produce an error message. 247 /// \return true if the Decl is a pointer type; false otherwise 248 /// 249 static bool checkIsPointer(Sema &S, const Decl *D, const AttributeList &Attr) { 250 if (const ValueDecl *vd = dyn_cast<ValueDecl>(D)) { 251 QualType QT = vd->getType(); 252 if (QT->isAnyPointerType()) 253 return true; 254 S.Diag(Attr.getLoc(), diag::warn_pointer_attribute_wrong_type) 255 << Attr.getName()->getName() << QT; 256 } else { 257 S.Diag(Attr.getLoc(), diag::err_attribute_can_be_applied_only_to_value_decl) 258 << Attr.getName(); 259 } 260 return false; 261 } 262 263 /// \brief Checks that the passed in QualType either is of RecordType or points 264 /// to RecordType. Returns the relevant RecordType, null if it does not exit. 265 static const RecordType *getRecordType(QualType QT) { 266 if (const RecordType *RT = QT->getAs<RecordType>()) 267 return RT; 268 269 // Now check if we point to record type. 270 if (const PointerType *PT = QT->getAs<PointerType>()) 271 return PT->getPointeeType()->getAs<RecordType>(); 272 273 return 0; 274 } 275 276 /// \brief Thread Safety Analysis: Checks that the passed in RecordType 277 /// resolves to a lockable object. May flag an error. 278 static bool checkForLockableRecord(Sema &S, Decl *D, const AttributeList &Attr, 279 const RecordType *RT) { 280 // Flag error if could not get record type for this argument. 281 if (!RT) { 282 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_class) 283 << Attr.getName(); 284 return false; 285 } 286 // Flag error if the type is not lockable. 287 if (!RT->getDecl()->getAttr<LockableAttr>()) { 288 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_lockable) 289 << Attr.getName(); 290 return false; 291 } 292 return true; 293 } 294 295 /// \brief Thread Safety Analysis: Checks that all attribute arguments, starting 296 /// from Sidx, resolve to a lockable object. May flag an error. 297 /// \param Sidx The attribute argument index to start checking with. 298 /// \param ParamIdxOk Whether an argument can be indexing into a function 299 /// parameter list. 300 static bool checkAttrArgsAreLockableObjs(Sema &S, Decl *D, 301 const AttributeList &Attr, 302 SmallVectorImpl<Expr*> &Args, 303 int Sidx = 0, 304 bool ParamIdxOk = false) { 305 for(unsigned Idx = Sidx; Idx < Attr.getNumArgs(); ++Idx) { 306 Expr *ArgExp = Attr.getArg(Idx); 307 308 if (ArgExp->isTypeDependent()) { 309 // FIXME -- need to processs this again on template instantiation 310 Args.push_back(ArgExp); 311 continue; 312 } 313 314 QualType ArgTy = ArgExp->getType(); 315 316 // First see if we can just cast to record type, or point to record type. 317 const RecordType *RT = getRecordType(ArgTy); 318 319 // Now check if we index into a record type function param. 320 if(!RT && ParamIdxOk) { 321 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 322 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(ArgExp); 323 if(FD && IL) { 324 unsigned int NumParams = FD->getNumParams(); 325 llvm::APInt ArgValue = IL->getValue(); 326 uint64_t ParamIdxFromOne = ArgValue.getZExtValue(); 327 uint64_t ParamIdxFromZero = ParamIdxFromOne - 1; 328 if(!ArgValue.isStrictlyPositive() || ParamIdxFromOne > NumParams) { 329 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_range) 330 << Attr.getName() << Idx + 1 << NumParams; 331 return false; 332 } 333 ArgTy = FD->getParamDecl(ParamIdxFromZero)->getType(); 334 RT = getRecordType(ArgTy); 335 } 336 } 337 338 if (!checkForLockableRecord(S, D, Attr, RT)) 339 return false; 340 341 Args.push_back(ArgExp); 342 } 343 return true; 344 } 345 346 //===----------------------------------------------------------------------===// 347 // Attribute Implementations 348 //===----------------------------------------------------------------------===// 349 350 // FIXME: All this manual attribute parsing code is gross. At the 351 // least add some helper functions to check most argument patterns (# 352 // and types of args). 353 354 static void handleGuardedVarAttr(Sema &S, Decl *D, const AttributeList &Attr, 355 bool pointer = false) { 356 assert(!Attr.isInvalid()); 357 358 if (!checkAttributeNumArgs(S, Attr, 0)) 359 return; 360 361 // D must be either a member field or global (potentially shared) variable. 362 if (!mayBeSharedVariable(D)) { 363 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 364 << Attr.getName() << ExpectedFieldOrGlobalVar; 365 return; 366 } 367 368 if (pointer && !checkIsPointer(S, D, Attr)) 369 return; 370 371 if (pointer) 372 D->addAttr(::new (S.Context) PtGuardedVarAttr(Attr.getRange(), S.Context)); 373 else 374 D->addAttr(::new (S.Context) GuardedVarAttr(Attr.getRange(), S.Context)); 375 } 376 377 static void handleGuardedByAttr(Sema &S, Decl *D, const AttributeList &Attr, 378 bool pointer = false) { 379 assert(!Attr.isInvalid()); 380 381 if (!checkAttributeNumArgs(S, Attr, 1)) 382 return; 383 384 Expr *Arg = Attr.getArg(0); 385 386 // D must be either a member field or global (potentially shared) variable. 387 if (!mayBeSharedVariable(D)) { 388 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 389 << Attr.getName() << ExpectedFieldOrGlobalVar; 390 return; 391 } 392 393 if (pointer && !checkIsPointer(S, D, Attr)) 394 return; 395 396 if (Arg->isTypeDependent()) 397 // FIXME: handle attributes with dependent types 398 return; 399 400 // check that the argument is lockable object 401 if (!checkForLockableRecord(S, D, Attr, getRecordType(Arg->getType()))) 402 return; 403 404 if (pointer) 405 D->addAttr(::new (S.Context) PtGuardedByAttr(Attr.getRange(), 406 S.Context, Arg)); 407 else 408 D->addAttr(::new (S.Context) GuardedByAttr(Attr.getRange(), S.Context, Arg)); 409 } 410 411 412 static void handleLockableAttr(Sema &S, Decl *D, const AttributeList &Attr, 413 bool scoped = false) { 414 assert(!Attr.isInvalid()); 415 416 if (!checkAttributeNumArgs(S, Attr, 0)) 417 return; 418 419 // FIXME: Lockable structs for C code. 420 if (!isa<CXXRecordDecl>(D)) { 421 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 422 << Attr.getName() << ExpectedClass; 423 return; 424 } 425 426 if (scoped) 427 D->addAttr(::new (S.Context) ScopedLockableAttr(Attr.getRange(), S.Context)); 428 else 429 D->addAttr(::new (S.Context) LockableAttr(Attr.getRange(), S.Context)); 430 } 431 432 static void handleNoThreadSafetyAttr(Sema &S, Decl *D, 433 const AttributeList &Attr) { 434 assert(!Attr.isInvalid()); 435 436 if (!checkAttributeNumArgs(S, Attr, 0)) 437 return; 438 439 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 440 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 441 << Attr.getName() << ExpectedFunctionOrMethod; 442 return; 443 } 444 445 D->addAttr(::new (S.Context) NoThreadSafetyAnalysisAttr(Attr.getRange(), 446 S.Context)); 447 } 448 449 static void handleAcquireOrderAttr(Sema &S, Decl *D, const AttributeList &Attr, 450 bool before) { 451 assert(!Attr.isInvalid()); 452 453 if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) 454 return; 455 456 // D must be either a member field or global (potentially shared) variable. 457 ValueDecl *VD = dyn_cast<ValueDecl>(D); 458 if (!VD || !mayBeSharedVariable(D)) { 459 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 460 << Attr.getName() << ExpectedFieldOrGlobalVar; 461 return; 462 } 463 464 // Check that this attribute only applies to lockable types 465 QualType QT = VD->getType(); 466 if (!QT->isDependentType()) { 467 const RecordType *RT = getRecordType(QT); 468 if (!RT || !RT->getDecl()->getAttr<LockableAttr>()) { 469 S.Diag(Attr.getLoc(), diag::err_attribute_decl_not_lockable) 470 << Attr.getName(); 471 return; 472 } 473 } 474 475 SmallVector<Expr*, 1> Args; 476 // check that all arguments are lockable objects 477 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args)) 478 return; 479 480 unsigned Size = Args.size(); 481 assert(Size == Attr.getNumArgs()); 482 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 483 484 if (before) 485 D->addAttr(::new (S.Context) AcquiredBeforeAttr(Attr.getRange(), S.Context, 486 StartArg, Size)); 487 else 488 D->addAttr(::new (S.Context) AcquiredAfterAttr(Attr.getRange(), S.Context, 489 StartArg, Size)); 490 } 491 492 static void handleLockFunAttr(Sema &S, Decl *D, const AttributeList &Attr, 493 bool exclusive = false) { 494 assert(!Attr.isInvalid()); 495 496 // zero or more arguments ok 497 498 // check that the attribute is applied to a function 499 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 500 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 501 << Attr.getName() << ExpectedFunctionOrMethod; 502 return; 503 } 504 505 // check that all arguments are lockable objects 506 SmallVector<Expr*, 1> Args; 507 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true)) 508 return; 509 510 unsigned Size = Args.size(); 511 assert(Size == Attr.getNumArgs()); 512 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 513 514 if (exclusive) 515 D->addAttr(::new (S.Context) ExclusiveLockFunctionAttr(Attr.getRange(), 516 S.Context, StartArg, 517 Size)); 518 else 519 D->addAttr(::new (S.Context) SharedLockFunctionAttr(Attr.getRange(), 520 S.Context, StartArg, 521 Size)); 522 } 523 524 static void handleTrylockFunAttr(Sema &S, Decl *D, const AttributeList &Attr, 525 bool exclusive = false) { 526 assert(!Attr.isInvalid()); 527 528 if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) 529 return; 530 531 532 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 533 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 534 << Attr.getName() << ExpectedFunctionOrMethod; 535 return; 536 } 537 538 if (!isIntOrBool(Attr.getArg(0))) { 539 S.Diag(Attr.getLoc(), diag::err_attribute_first_argument_not_int_or_bool) 540 << Attr.getName(); 541 return; 542 } 543 544 SmallVector<Expr*, 2> Args; 545 // check that all arguments are lockable objects 546 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 1)) 547 return; 548 549 unsigned Size = Args.size(); 550 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 551 552 if (exclusive) 553 D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(Attr.getRange(), 554 S.Context, 555 Attr.getArg(0), 556 StartArg, Size)); 557 else 558 D->addAttr(::new (S.Context) SharedTrylockFunctionAttr(Attr.getRange(), 559 S.Context, 560 Attr.getArg(0), 561 StartArg, Size)); 562 } 563 564 static void handleLocksRequiredAttr(Sema &S, Decl *D, const AttributeList &Attr, 565 bool exclusive = false) { 566 assert(!Attr.isInvalid()); 567 568 if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) 569 return; 570 571 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 572 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 573 << Attr.getName() << ExpectedFunctionOrMethod; 574 return; 575 } 576 577 // check that all arguments are lockable objects 578 SmallVector<Expr*, 1> Args; 579 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args)) 580 return; 581 582 unsigned Size = Args.size(); 583 assert(Size == Attr.getNumArgs()); 584 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 585 586 if (exclusive) 587 D->addAttr(::new (S.Context) ExclusiveLocksRequiredAttr(Attr.getRange(), 588 S.Context, StartArg, 589 Size)); 590 else 591 D->addAttr(::new (S.Context) SharedLocksRequiredAttr(Attr.getRange(), 592 S.Context, StartArg, 593 Size)); 594 } 595 596 static void handleUnlockFunAttr(Sema &S, Decl *D, 597 const AttributeList &Attr) { 598 assert(!Attr.isInvalid()); 599 600 // zero or more arguments ok 601 602 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 603 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 604 << Attr.getName() << ExpectedFunctionOrMethod; 605 return; 606 } 607 608 // check that all arguments are lockable objects 609 SmallVector<Expr*, 1> Args; 610 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args, 0, /*ParamIdxOk=*/true)) 611 return; 612 613 unsigned Size = Args.size(); 614 assert(Size == Attr.getNumArgs()); 615 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 616 617 D->addAttr(::new (S.Context) UnlockFunctionAttr(Attr.getRange(), S.Context, 618 StartArg, Size)); 619 } 620 621 static void handleLockReturnedAttr(Sema &S, Decl *D, 622 const AttributeList &Attr) { 623 assert(!Attr.isInvalid()); 624 625 if (!checkAttributeNumArgs(S, Attr, 1)) 626 return; 627 Expr *Arg = Attr.getArg(0); 628 629 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 630 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 631 << Attr.getName() << ExpectedFunctionOrMethod; 632 return; 633 } 634 635 if (Arg->isTypeDependent()) 636 return; 637 638 // check that the argument is lockable object 639 if (!checkForLockableRecord(S, D, Attr, getRecordType(Arg->getType()))) 640 return; 641 642 D->addAttr(::new (S.Context) LockReturnedAttr(Attr.getRange(), S.Context, Arg)); 643 } 644 645 static void handleLocksExcludedAttr(Sema &S, Decl *D, 646 const AttributeList &Attr) { 647 assert(!Attr.isInvalid()); 648 649 if (!checkAttributeAtLeastNumArgs(S, Attr, 1)) 650 return; 651 652 if (!isa<FunctionDecl>(D) && !isa<FunctionTemplateDecl>(D)) { 653 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 654 << Attr.getName() << ExpectedFunctionOrMethod; 655 return; 656 } 657 658 // check that all arguments are lockable objects 659 SmallVector<Expr*, 1> Args; 660 if (!checkAttrArgsAreLockableObjs(S, D, Attr, Args)) 661 return; 662 663 unsigned Size = Args.size(); 664 assert(Size == Attr.getNumArgs()); 665 Expr **StartArg = Size == 0 ? 0 : &Args[0]; 666 667 D->addAttr(::new (S.Context) LocksExcludedAttr(Attr.getRange(), S.Context, 668 StartArg, Size)); 669 } 670 671 672 static void handleExtVectorTypeAttr(Sema &S, Scope *scope, Decl *D, 673 const AttributeList &Attr) { 674 TypedefNameDecl *tDecl = dyn_cast<TypedefNameDecl>(D); 675 if (tDecl == 0) { 676 S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef); 677 return; 678 } 679 680 QualType curType = tDecl->getUnderlyingType(); 681 682 Expr *sizeExpr; 683 684 // Special case where the argument is a template id. 685 if (Attr.getParameterName()) { 686 CXXScopeSpec SS; 687 UnqualifiedId id; 688 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 689 690 ExprResult Size = S.ActOnIdExpression(scope, SS, id, false, false); 691 if (Size.isInvalid()) 692 return; 693 694 sizeExpr = Size.get(); 695 } else { 696 // check the attribute arguments. 697 if (!checkAttributeNumArgs(S, Attr, 1)) 698 return; 699 700 sizeExpr = Attr.getArg(0); 701 } 702 703 // Instantiate/Install the vector type, and let Sema build the type for us. 704 // This will run the reguired checks. 705 QualType T = S.BuildExtVectorType(curType, sizeExpr, Attr.getLoc()); 706 if (!T.isNull()) { 707 // FIXME: preserve the old source info. 708 tDecl->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(T)); 709 710 // Remember this typedef decl, we will need it later for diagnostics. 711 S.ExtVectorDecls.push_back(tDecl); 712 } 713 } 714 715 static void handlePackedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 716 // check the attribute arguments. 717 if (!checkAttributeNumArgs(S, Attr, 0)) 718 return; 719 720 if (TagDecl *TD = dyn_cast<TagDecl>(D)) 721 TD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context)); 722 else if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 723 // If the alignment is less than or equal to 8 bits, the packed attribute 724 // has no effect. 725 if (!FD->getType()->isIncompleteType() && 726 S.Context.getTypeAlign(FD->getType()) <= 8) 727 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type) 728 << Attr.getName() << FD->getType(); 729 else 730 FD->addAttr(::new (S.Context) PackedAttr(Attr.getRange(), S.Context)); 731 } else 732 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); 733 } 734 735 static void handleMsStructAttr(Sema &S, Decl *D, const AttributeList &Attr) { 736 if (TagDecl *TD = dyn_cast<TagDecl>(D)) 737 TD->addAttr(::new (S.Context) MsStructAttr(Attr.getRange(), S.Context)); 738 else 739 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); 740 } 741 742 static void handleIBAction(Sema &S, Decl *D, const AttributeList &Attr) { 743 // check the attribute arguments. 744 if (!checkAttributeNumArgs(S, Attr, 0)) 745 return; 746 747 // The IBAction attributes only apply to instance methods. 748 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) 749 if (MD->isInstanceMethod()) { 750 D->addAttr(::new (S.Context) IBActionAttr(Attr.getRange(), S.Context)); 751 return; 752 } 753 754 S.Diag(Attr.getLoc(), diag::warn_attribute_ibaction) << Attr.getName(); 755 } 756 757 static bool checkIBOutletCommon(Sema &S, Decl *D, const AttributeList &Attr) { 758 // The IBOutlet/IBOutletCollection attributes only apply to instance 759 // variables or properties of Objective-C classes. The outlet must also 760 // have an object reference type. 761 if (const ObjCIvarDecl *VD = dyn_cast<ObjCIvarDecl>(D)) { 762 if (!VD->getType()->getAs<ObjCObjectPointerType>()) { 763 S.Diag(Attr.getLoc(), diag::err_iboutlet_object_type) 764 << Attr.getName() << VD->getType() << 0; 765 return false; 766 } 767 } 768 else if (const ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) { 769 if (!PD->getType()->getAs<ObjCObjectPointerType>()) { 770 S.Diag(Attr.getLoc(), diag::err_iboutlet_object_type) 771 << Attr.getName() << PD->getType() << 1; 772 return false; 773 } 774 } 775 else { 776 S.Diag(Attr.getLoc(), diag::warn_attribute_iboutlet) << Attr.getName(); 777 return false; 778 } 779 780 return true; 781 } 782 783 static void handleIBOutlet(Sema &S, Decl *D, const AttributeList &Attr) { 784 // check the attribute arguments. 785 if (!checkAttributeNumArgs(S, Attr, 0)) 786 return; 787 788 if (!checkIBOutletCommon(S, D, Attr)) 789 return; 790 791 D->addAttr(::new (S.Context) IBOutletAttr(Attr.getRange(), S.Context)); 792 } 793 794 static void handleIBOutletCollection(Sema &S, Decl *D, 795 const AttributeList &Attr) { 796 797 // The iboutletcollection attribute can have zero or one arguments. 798 if (Attr.getParameterName() && Attr.getNumArgs() > 0) { 799 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 800 return; 801 } 802 803 if (!checkIBOutletCommon(S, D, Attr)) 804 return; 805 806 IdentifierInfo *II = Attr.getParameterName(); 807 if (!II) 808 II = &S.Context.Idents.get("NSObject"); 809 810 ParsedType TypeRep = S.getTypeName(*II, Attr.getLoc(), 811 S.getScopeForContext(D->getDeclContext()->getParent())); 812 if (!TypeRep) { 813 S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << II; 814 return; 815 } 816 QualType QT = TypeRep.get(); 817 // Diagnose use of non-object type in iboutletcollection attribute. 818 // FIXME. Gnu attribute extension ignores use of builtin types in 819 // attributes. So, __attribute__((iboutletcollection(char))) will be 820 // treated as __attribute__((iboutletcollection())). 821 if (!QT->isObjCIdType() && !QT->isObjCObjectType()) { 822 S.Diag(Attr.getLoc(), diag::err_iboutletcollection_type) << II; 823 return; 824 } 825 D->addAttr(::new (S.Context) IBOutletCollectionAttr(Attr.getRange(),S.Context, 826 QT, Attr.getParameterLoc())); 827 } 828 829 static void possibleTransparentUnionPointerType(QualType &T) { 830 if (const RecordType *UT = T->getAsUnionType()) 831 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) { 832 RecordDecl *UD = UT->getDecl(); 833 for (RecordDecl::field_iterator it = UD->field_begin(), 834 itend = UD->field_end(); it != itend; ++it) { 835 QualType QT = it->getType(); 836 if (QT->isAnyPointerType() || QT->isBlockPointerType()) { 837 T = QT; 838 return; 839 } 840 } 841 } 842 } 843 844 static void handleNonNullAttr(Sema &S, Decl *D, const AttributeList &Attr) { 845 // GCC ignores the nonnull attribute on K&R style function prototypes, so we 846 // ignore it as well 847 if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) { 848 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 849 << Attr.getName() << ExpectedFunction; 850 return; 851 } 852 853 // In C++ the implicit 'this' function parameter also counts, and they are 854 // counted from one. 855 bool HasImplicitThisParam = isInstanceMethod(D); 856 unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam; 857 858 // The nonnull attribute only applies to pointers. 859 SmallVector<unsigned, 10> NonNullArgs; 860 861 for (AttributeList::arg_iterator I=Attr.arg_begin(), 862 E=Attr.arg_end(); I!=E; ++I) { 863 864 865 // The argument must be an integer constant expression. 866 Expr *Ex = *I; 867 llvm::APSInt ArgNum(32); 868 if (Ex->isTypeDependent() || Ex->isValueDependent() || 869 !Ex->isIntegerConstantExpr(ArgNum, S.Context)) { 870 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 871 << "nonnull" << Ex->getSourceRange(); 872 return; 873 } 874 875 unsigned x = (unsigned) ArgNum.getZExtValue(); 876 877 if (x < 1 || x > NumArgs) { 878 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 879 << "nonnull" << I.getArgNum() << Ex->getSourceRange(); 880 return; 881 } 882 883 --x; 884 if (HasImplicitThisParam) { 885 if (x == 0) { 886 S.Diag(Attr.getLoc(), 887 diag::err_attribute_invalid_implicit_this_argument) 888 << "nonnull" << Ex->getSourceRange(); 889 return; 890 } 891 --x; 892 } 893 894 // Is the function argument a pointer type? 895 QualType T = getFunctionOrMethodArgType(D, x).getNonReferenceType(); 896 possibleTransparentUnionPointerType(T); 897 898 if (!T->isAnyPointerType() && !T->isBlockPointerType()) { 899 // FIXME: Should also highlight argument in decl. 900 S.Diag(Attr.getLoc(), diag::warn_nonnull_pointers_only) 901 << "nonnull" << Ex->getSourceRange(); 902 continue; 903 } 904 905 NonNullArgs.push_back(x); 906 } 907 908 // If no arguments were specified to __attribute__((nonnull)) then all pointer 909 // arguments have a nonnull attribute. 910 if (NonNullArgs.empty()) { 911 for (unsigned I = 0, E = getFunctionOrMethodNumArgs(D); I != E; ++I) { 912 QualType T = getFunctionOrMethodArgType(D, I).getNonReferenceType(); 913 possibleTransparentUnionPointerType(T); 914 if (T->isAnyPointerType() || T->isBlockPointerType()) 915 NonNullArgs.push_back(I); 916 } 917 918 // No pointer arguments? 919 if (NonNullArgs.empty()) { 920 // Warn the trivial case only if attribute is not coming from a 921 // macro instantiation. 922 if (Attr.getLoc().isFileID()) 923 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers); 924 return; 925 } 926 } 927 928 unsigned* start = &NonNullArgs[0]; 929 unsigned size = NonNullArgs.size(); 930 llvm::array_pod_sort(start, start + size); 931 D->addAttr(::new (S.Context) NonNullAttr(Attr.getRange(), S.Context, start, 932 size)); 933 } 934 935 static void handleOwnershipAttr(Sema &S, Decl *D, const AttributeList &AL) { 936 // This attribute must be applied to a function declaration. 937 // The first argument to the attribute must be a string, 938 // the name of the resource, for example "malloc". 939 // The following arguments must be argument indexes, the arguments must be 940 // of integer type for Returns, otherwise of pointer type. 941 // The difference between Holds and Takes is that a pointer may still be used 942 // after being held. free() should be __attribute((ownership_takes)), whereas 943 // a list append function may well be __attribute((ownership_holds)). 944 945 if (!AL.getParameterName()) { 946 S.Diag(AL.getLoc(), diag::err_attribute_argument_n_not_string) 947 << AL.getName()->getName() << 1; 948 return; 949 } 950 // Figure out our Kind, and check arguments while we're at it. 951 OwnershipAttr::OwnershipKind K; 952 switch (AL.getKind()) { 953 case AttributeList::AT_ownership_takes: 954 K = OwnershipAttr::Takes; 955 if (AL.getNumArgs() < 1) { 956 S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2; 957 return; 958 } 959 break; 960 case AttributeList::AT_ownership_holds: 961 K = OwnershipAttr::Holds; 962 if (AL.getNumArgs() < 1) { 963 S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2; 964 return; 965 } 966 break; 967 case AttributeList::AT_ownership_returns: 968 K = OwnershipAttr::Returns; 969 if (AL.getNumArgs() > 1) { 970 S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) 971 << AL.getNumArgs() + 1; 972 return; 973 } 974 break; 975 default: 976 // This should never happen given how we are called. 977 llvm_unreachable("Unknown ownership attribute"); 978 } 979 980 if (!isFunction(D) || !hasFunctionProto(D)) { 981 S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type) 982 << AL.getName() << ExpectedFunction; 983 return; 984 } 985 986 // In C++ the implicit 'this' function parameter also counts, and they are 987 // counted from one. 988 bool HasImplicitThisParam = isInstanceMethod(D); 989 unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam; 990 991 StringRef Module = AL.getParameterName()->getName(); 992 993 // Normalize the argument, __foo__ becomes foo. 994 if (Module.startswith("__") && Module.endswith("__")) 995 Module = Module.substr(2, Module.size() - 4); 996 997 SmallVector<unsigned, 10> OwnershipArgs; 998 999 for (AttributeList::arg_iterator I = AL.arg_begin(), E = AL.arg_end(); I != E; 1000 ++I) { 1001 1002 Expr *IdxExpr = *I; 1003 llvm::APSInt ArgNum(32); 1004 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() 1005 || !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) { 1006 S.Diag(AL.getLoc(), diag::err_attribute_argument_not_int) 1007 << AL.getName()->getName() << IdxExpr->getSourceRange(); 1008 continue; 1009 } 1010 1011 unsigned x = (unsigned) ArgNum.getZExtValue(); 1012 1013 if (x > NumArgs || x < 1) { 1014 S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds) 1015 << AL.getName()->getName() << x << IdxExpr->getSourceRange(); 1016 continue; 1017 } 1018 --x; 1019 if (HasImplicitThisParam) { 1020 if (x == 0) { 1021 S.Diag(AL.getLoc(), diag::err_attribute_invalid_implicit_this_argument) 1022 << "ownership" << IdxExpr->getSourceRange(); 1023 return; 1024 } 1025 --x; 1026 } 1027 1028 switch (K) { 1029 case OwnershipAttr::Takes: 1030 case OwnershipAttr::Holds: { 1031 // Is the function argument a pointer type? 1032 QualType T = getFunctionOrMethodArgType(D, x); 1033 if (!T->isAnyPointerType() && !T->isBlockPointerType()) { 1034 // FIXME: Should also highlight argument in decl. 1035 S.Diag(AL.getLoc(), diag::err_ownership_type) 1036 << ((K==OwnershipAttr::Takes)?"ownership_takes":"ownership_holds") 1037 << "pointer" 1038 << IdxExpr->getSourceRange(); 1039 continue; 1040 } 1041 break; 1042 } 1043 case OwnershipAttr::Returns: { 1044 if (AL.getNumArgs() > 1) { 1045 // Is the function argument an integer type? 1046 Expr *IdxExpr = AL.getArg(0); 1047 llvm::APSInt ArgNum(32); 1048 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() 1049 || !IdxExpr->isIntegerConstantExpr(ArgNum, S.Context)) { 1050 S.Diag(AL.getLoc(), diag::err_ownership_type) 1051 << "ownership_returns" << "integer" 1052 << IdxExpr->getSourceRange(); 1053 return; 1054 } 1055 } 1056 break; 1057 } 1058 default: 1059 llvm_unreachable("Unknown ownership attribute"); 1060 } // switch 1061 1062 // Check we don't have a conflict with another ownership attribute. 1063 for (specific_attr_iterator<OwnershipAttr> 1064 i = D->specific_attr_begin<OwnershipAttr>(), 1065 e = D->specific_attr_end<OwnershipAttr>(); 1066 i != e; ++i) { 1067 if ((*i)->getOwnKind() != K) { 1068 for (const unsigned *I = (*i)->args_begin(), *E = (*i)->args_end(); 1069 I!=E; ++I) { 1070 if (x == *I) { 1071 S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible) 1072 << AL.getName()->getName() << "ownership_*"; 1073 } 1074 } 1075 } 1076 } 1077 OwnershipArgs.push_back(x); 1078 } 1079 1080 unsigned* start = OwnershipArgs.data(); 1081 unsigned size = OwnershipArgs.size(); 1082 llvm::array_pod_sort(start, start + size); 1083 1084 if (K != OwnershipAttr::Returns && OwnershipArgs.empty()) { 1085 S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << 2; 1086 return; 1087 } 1088 1089 D->addAttr(::new (S.Context) OwnershipAttr(AL.getLoc(), S.Context, K, Module, 1090 start, size)); 1091 } 1092 1093 /// Whether this declaration has internal linkage for the purposes of 1094 /// things that want to complain about things not have internal linkage. 1095 static bool hasEffectivelyInternalLinkage(NamedDecl *D) { 1096 switch (D->getLinkage()) { 1097 case NoLinkage: 1098 case InternalLinkage: 1099 return true; 1100 1101 // Template instantiations that go from external to unique-external 1102 // shouldn't get diagnosed. 1103 case UniqueExternalLinkage: 1104 return true; 1105 1106 case ExternalLinkage: 1107 return false; 1108 } 1109 llvm_unreachable("unknown linkage kind!"); 1110 return false; 1111 } 1112 1113 static void handleWeakRefAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1114 // Check the attribute arguments. 1115 if (Attr.getNumArgs() > 1) { 1116 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1117 return; 1118 } 1119 1120 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) { 1121 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 1122 << Attr.getName() << ExpectedVariableOrFunction; 1123 return; 1124 } 1125 1126 NamedDecl *nd = cast<NamedDecl>(D); 1127 1128 // gcc rejects 1129 // class c { 1130 // static int a __attribute__((weakref ("v2"))); 1131 // static int b() __attribute__((weakref ("f3"))); 1132 // }; 1133 // and ignores the attributes of 1134 // void f(void) { 1135 // static int a __attribute__((weakref ("v2"))); 1136 // } 1137 // we reject them 1138 const DeclContext *Ctx = D->getDeclContext()->getRedeclContext(); 1139 if (!Ctx->isFileContext()) { 1140 S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_global_context) << 1141 nd->getNameAsString(); 1142 return; 1143 } 1144 1145 // The GCC manual says 1146 // 1147 // At present, a declaration to which `weakref' is attached can only 1148 // be `static'. 1149 // 1150 // It also says 1151 // 1152 // Without a TARGET, 1153 // given as an argument to `weakref' or to `alias', `weakref' is 1154 // equivalent to `weak'. 1155 // 1156 // gcc 4.4.1 will accept 1157 // int a7 __attribute__((weakref)); 1158 // as 1159 // int a7 __attribute__((weak)); 1160 // This looks like a bug in gcc. We reject that for now. We should revisit 1161 // it if this behaviour is actually used. 1162 1163 if (!hasEffectivelyInternalLinkage(nd)) { 1164 S.Diag(Attr.getLoc(), diag::err_attribute_weakref_not_static); 1165 return; 1166 } 1167 1168 // GCC rejects 1169 // static ((alias ("y"), weakref)). 1170 // Should we? How to check that weakref is before or after alias? 1171 1172 if (Attr.getNumArgs() == 1) { 1173 Expr *Arg = Attr.getArg(0); 1174 Arg = Arg->IgnoreParenCasts(); 1175 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 1176 1177 if (!Str || !Str->isAscii()) { 1178 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1179 << "weakref" << 1; 1180 return; 1181 } 1182 // GCC will accept anything as the argument of weakref. Should we 1183 // check for an existing decl? 1184 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, 1185 Str->getString())); 1186 } 1187 1188 D->addAttr(::new (S.Context) WeakRefAttr(Attr.getRange(), S.Context)); 1189 } 1190 1191 static void handleAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1192 // check the attribute arguments. 1193 if (Attr.getNumArgs() != 1) { 1194 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1195 return; 1196 } 1197 1198 Expr *Arg = Attr.getArg(0); 1199 Arg = Arg->IgnoreParenCasts(); 1200 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 1201 1202 if (!Str || !Str->isAscii()) { 1203 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1204 << "alias" << 1; 1205 return; 1206 } 1207 1208 if (S.Context.getTargetInfo().getTriple().isOSDarwin()) { 1209 S.Diag(Attr.getLoc(), diag::err_alias_not_supported_on_darwin); 1210 return; 1211 } 1212 1213 // FIXME: check if target symbol exists in current file 1214 1215 D->addAttr(::new (S.Context) AliasAttr(Attr.getRange(), S.Context, 1216 Str->getString())); 1217 } 1218 1219 static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1220 // Check the attribute arguments. 1221 if (!checkAttributeNumArgs(S, Attr, 0)) 1222 return; 1223 1224 if (!isa<FunctionDecl>(D)) { 1225 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1226 << Attr.getName() << ExpectedFunction; 1227 return; 1228 } 1229 1230 D->addAttr(::new (S.Context) NakedAttr(Attr.getRange(), S.Context)); 1231 } 1232 1233 static void handleAlwaysInlineAttr(Sema &S, Decl *D, 1234 const AttributeList &Attr) { 1235 // Check the attribute arguments. 1236 if (Attr.hasParameterOrArguments()) { 1237 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1238 return; 1239 } 1240 1241 if (!isa<FunctionDecl>(D)) { 1242 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1243 << Attr.getName() << ExpectedFunction; 1244 return; 1245 } 1246 1247 D->addAttr(::new (S.Context) AlwaysInlineAttr(Attr.getRange(), S.Context)); 1248 } 1249 1250 static void handleMallocAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1251 // Check the attribute arguments. 1252 if (Attr.hasParameterOrArguments()) { 1253 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1254 return; 1255 } 1256 1257 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1258 QualType RetTy = FD->getResultType(); 1259 if (RetTy->isAnyPointerType() || RetTy->isBlockPointerType()) { 1260 D->addAttr(::new (S.Context) MallocAttr(Attr.getRange(), S.Context)); 1261 return; 1262 } 1263 } 1264 1265 S.Diag(Attr.getLoc(), diag::warn_attribute_malloc_pointer_only); 1266 } 1267 1268 static void handleMayAliasAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1269 // check the attribute arguments. 1270 if (!checkAttributeNumArgs(S, Attr, 0)) 1271 return; 1272 1273 D->addAttr(::new (S.Context) MayAliasAttr(Attr.getRange(), S.Context)); 1274 } 1275 1276 static void handleNoCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1277 assert(!Attr.isInvalid()); 1278 if (isa<VarDecl>(D)) 1279 D->addAttr(::new (S.Context) NoCommonAttr(Attr.getRange(), S.Context)); 1280 else 1281 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1282 << Attr.getName() << ExpectedVariable; 1283 } 1284 1285 static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1286 assert(!Attr.isInvalid()); 1287 if (isa<VarDecl>(D)) 1288 D->addAttr(::new (S.Context) CommonAttr(Attr.getRange(), S.Context)); 1289 else 1290 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1291 << Attr.getName() << ExpectedVariable; 1292 } 1293 1294 static void handleNoReturnAttr(Sema &S, Decl *D, const AttributeList &attr) { 1295 if (hasDeclarator(D)) return; 1296 1297 if (S.CheckNoReturnAttr(attr)) return; 1298 1299 if (!isa<ObjCMethodDecl>(D)) { 1300 S.Diag(attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1301 << attr.getName() << ExpectedFunctionOrMethod; 1302 return; 1303 } 1304 1305 D->addAttr(::new (S.Context) NoReturnAttr(attr.getRange(), S.Context)); 1306 } 1307 1308 bool Sema::CheckNoReturnAttr(const AttributeList &attr) { 1309 if (attr.hasParameterOrArguments()) { 1310 Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1311 attr.setInvalid(); 1312 return true; 1313 } 1314 1315 return false; 1316 } 1317 1318 static void handleAnalyzerNoReturnAttr(Sema &S, Decl *D, 1319 const AttributeList &Attr) { 1320 1321 // The checking path for 'noreturn' and 'analyzer_noreturn' are different 1322 // because 'analyzer_noreturn' does not impact the type. 1323 1324 if(!checkAttributeNumArgs(S, Attr, 0)) 1325 return; 1326 1327 if (!isFunctionOrMethod(D) && !isa<BlockDecl>(D)) { 1328 ValueDecl *VD = dyn_cast<ValueDecl>(D); 1329 if (VD == 0 || (!VD->getType()->isBlockPointerType() 1330 && !VD->getType()->isFunctionPointerType())) { 1331 S.Diag(Attr.getLoc(), 1332 Attr.isCXX0XAttribute() ? diag::err_attribute_wrong_decl_type 1333 : diag::warn_attribute_wrong_decl_type) 1334 << Attr.getName() << ExpectedFunctionMethodOrBlock; 1335 return; 1336 } 1337 } 1338 1339 D->addAttr(::new (S.Context) AnalyzerNoReturnAttr(Attr.getRange(), S.Context)); 1340 } 1341 1342 // PS3 PPU-specific. 1343 static void handleVecReturnAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1344 /* 1345 Returning a Vector Class in Registers 1346 1347 According to the PPU ABI specifications, a class with a single member of 1348 vector type is returned in memory when used as the return value of a function. 1349 This results in inefficient code when implementing vector classes. To return 1350 the value in a single vector register, add the vecreturn attribute to the 1351 class definition. This attribute is also applicable to struct types. 1352 1353 Example: 1354 1355 struct Vector 1356 { 1357 __vector float xyzw; 1358 } __attribute__((vecreturn)); 1359 1360 Vector Add(Vector lhs, Vector rhs) 1361 { 1362 Vector result; 1363 result.xyzw = vec_add(lhs.xyzw, rhs.xyzw); 1364 return result; // This will be returned in a register 1365 } 1366 */ 1367 if (!isa<RecordDecl>(D)) { 1368 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 1369 << Attr.getName() << ExpectedClass; 1370 return; 1371 } 1372 1373 if (D->getAttr<VecReturnAttr>()) { 1374 S.Diag(Attr.getLoc(), diag::err_repeat_attribute) << "vecreturn"; 1375 return; 1376 } 1377 1378 RecordDecl *record = cast<RecordDecl>(D); 1379 int count = 0; 1380 1381 if (!isa<CXXRecordDecl>(record)) { 1382 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member); 1383 return; 1384 } 1385 1386 if (!cast<CXXRecordDecl>(record)->isPOD()) { 1387 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_pod_record); 1388 return; 1389 } 1390 1391 for (RecordDecl::field_iterator iter = record->field_begin(); 1392 iter != record->field_end(); iter++) { 1393 if ((count == 1) || !iter->getType()->isVectorType()) { 1394 S.Diag(Attr.getLoc(), diag::err_attribute_vecreturn_only_vector_member); 1395 return; 1396 } 1397 count++; 1398 } 1399 1400 D->addAttr(::new (S.Context) VecReturnAttr(Attr.getRange(), S.Context)); 1401 } 1402 1403 static void handleDependencyAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1404 if (!isFunctionOrMethod(D) && !isa<ParmVarDecl>(D)) { 1405 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 1406 << Attr.getName() << ExpectedFunctionMethodOrParameter; 1407 return; 1408 } 1409 // FIXME: Actually store the attribute on the declaration 1410 } 1411 1412 static void handleUnusedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1413 // check the attribute arguments. 1414 if (Attr.hasParameterOrArguments()) { 1415 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1416 return; 1417 } 1418 1419 if (!isa<VarDecl>(D) && !isa<ObjCIvarDecl>(D) && !isFunctionOrMethod(D) && 1420 !isa<TypeDecl>(D) && !isa<LabelDecl>(D)) { 1421 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1422 << Attr.getName() << ExpectedVariableFunctionOrLabel; 1423 return; 1424 } 1425 1426 D->addAttr(::new (S.Context) UnusedAttr(Attr.getRange(), S.Context)); 1427 } 1428 1429 static void handleReturnsTwiceAttr(Sema &S, Decl *D, 1430 const AttributeList &Attr) { 1431 // check the attribute arguments. 1432 if (Attr.hasParameterOrArguments()) { 1433 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1434 return; 1435 } 1436 1437 if (!isa<FunctionDecl>(D)) { 1438 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1439 << Attr.getName() << ExpectedFunction; 1440 return; 1441 } 1442 1443 D->addAttr(::new (S.Context) ReturnsTwiceAttr(Attr.getRange(), S.Context)); 1444 } 1445 1446 static void handleUsedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1447 // check the attribute arguments. 1448 if (Attr.hasParameterOrArguments()) { 1449 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1450 return; 1451 } 1452 1453 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1454 if (VD->hasLocalStorage() || VD->hasExternalStorage()) { 1455 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "used"; 1456 return; 1457 } 1458 } else if (!isFunctionOrMethod(D)) { 1459 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1460 << Attr.getName() << ExpectedVariableOrFunction; 1461 return; 1462 } 1463 1464 D->addAttr(::new (S.Context) UsedAttr(Attr.getRange(), S.Context)); 1465 } 1466 1467 static void handleConstructorAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1468 // check the attribute arguments. 1469 if (Attr.getNumArgs() > 1) { 1470 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1; 1471 return; 1472 } 1473 1474 int priority = 65535; // FIXME: Do not hardcode such constants. 1475 if (Attr.getNumArgs() > 0) { 1476 Expr *E = Attr.getArg(0); 1477 llvm::APSInt Idx(32); 1478 if (E->isTypeDependent() || E->isValueDependent() || 1479 !E->isIntegerConstantExpr(Idx, S.Context)) { 1480 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 1481 << "constructor" << 1 << E->getSourceRange(); 1482 return; 1483 } 1484 priority = Idx.getZExtValue(); 1485 } 1486 1487 if (!isa<FunctionDecl>(D)) { 1488 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1489 << Attr.getName() << ExpectedFunction; 1490 return; 1491 } 1492 1493 D->addAttr(::new (S.Context) ConstructorAttr(Attr.getRange(), S.Context, 1494 priority)); 1495 } 1496 1497 static void handleDestructorAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1498 // check the attribute arguments. 1499 if (Attr.getNumArgs() > 1) { 1500 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1; 1501 return; 1502 } 1503 1504 int priority = 65535; // FIXME: Do not hardcode such constants. 1505 if (Attr.getNumArgs() > 0) { 1506 Expr *E = Attr.getArg(0); 1507 llvm::APSInt Idx(32); 1508 if (E->isTypeDependent() || E->isValueDependent() || 1509 !E->isIntegerConstantExpr(Idx, S.Context)) { 1510 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 1511 << "destructor" << 1 << E->getSourceRange(); 1512 return; 1513 } 1514 priority = Idx.getZExtValue(); 1515 } 1516 1517 if (!isa<FunctionDecl>(D)) { 1518 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1519 << Attr.getName() << ExpectedFunction; 1520 return; 1521 } 1522 1523 D->addAttr(::new (S.Context) DestructorAttr(Attr.getRange(), S.Context, 1524 priority)); 1525 } 1526 1527 static void handleDeprecatedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1528 unsigned NumArgs = Attr.getNumArgs(); 1529 if (NumArgs > 1) { 1530 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1; 1531 return; 1532 } 1533 1534 // Handle the case where deprecated attribute has a text message. 1535 StringRef Str; 1536 if (NumArgs == 1) { 1537 StringLiteral *SE = dyn_cast<StringLiteral>(Attr.getArg(0)); 1538 if (!SE) { 1539 S.Diag(Attr.getArg(0)->getLocStart(), diag::err_attribute_not_string) 1540 << "deprecated"; 1541 return; 1542 } 1543 Str = SE->getString(); 1544 } 1545 1546 D->addAttr(::new (S.Context) DeprecatedAttr(Attr.getRange(), S.Context, Str)); 1547 } 1548 1549 static void handleUnavailableAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1550 unsigned NumArgs = Attr.getNumArgs(); 1551 if (NumArgs > 1) { 1552 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 1; 1553 return; 1554 } 1555 1556 // Handle the case where unavailable attribute has a text message. 1557 StringRef Str; 1558 if (NumArgs == 1) { 1559 StringLiteral *SE = dyn_cast<StringLiteral>(Attr.getArg(0)); 1560 if (!SE) { 1561 S.Diag(Attr.getArg(0)->getLocStart(), 1562 diag::err_attribute_not_string) << "unavailable"; 1563 return; 1564 } 1565 Str = SE->getString(); 1566 } 1567 D->addAttr(::new (S.Context) UnavailableAttr(Attr.getRange(), S.Context, Str)); 1568 } 1569 1570 static void handleArcWeakrefUnavailableAttr(Sema &S, Decl *D, 1571 const AttributeList &Attr) { 1572 unsigned NumArgs = Attr.getNumArgs(); 1573 if (NumArgs > 0) { 1574 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 0; 1575 return; 1576 } 1577 1578 D->addAttr(::new (S.Context) ArcWeakrefUnavailableAttr( 1579 Attr.getRange(), S.Context)); 1580 } 1581 1582 static void handleAvailabilityAttr(Sema &S, Decl *D, 1583 const AttributeList &Attr) { 1584 IdentifierInfo *Platform = Attr.getParameterName(); 1585 SourceLocation PlatformLoc = Attr.getParameterLoc(); 1586 1587 StringRef PlatformName 1588 = AvailabilityAttr::getPrettyPlatformName(Platform->getName()); 1589 if (PlatformName.empty()) { 1590 S.Diag(PlatformLoc, diag::warn_availability_unknown_platform) 1591 << Platform; 1592 1593 PlatformName = Platform->getName(); 1594 } 1595 1596 AvailabilityChange Introduced = Attr.getAvailabilityIntroduced(); 1597 AvailabilityChange Deprecated = Attr.getAvailabilityDeprecated(); 1598 AvailabilityChange Obsoleted = Attr.getAvailabilityObsoleted(); 1599 bool IsUnavailable = Attr.getUnavailableLoc().isValid(); 1600 1601 // Ensure that Introduced <= Deprecated <= Obsoleted (although not all 1602 // of these steps are needed). 1603 if (Introduced.isValid() && Deprecated.isValid() && 1604 !(Introduced.Version <= Deprecated.Version)) { 1605 S.Diag(Introduced.KeywordLoc, diag::warn_availability_version_ordering) 1606 << 1 << PlatformName << Deprecated.Version.getAsString() 1607 << 0 << Introduced.Version.getAsString(); 1608 return; 1609 } 1610 1611 if (Introduced.isValid() && Obsoleted.isValid() && 1612 !(Introduced.Version <= Obsoleted.Version)) { 1613 S.Diag(Introduced.KeywordLoc, diag::warn_availability_version_ordering) 1614 << 2 << PlatformName << Obsoleted.Version.getAsString() 1615 << 0 << Introduced.Version.getAsString(); 1616 return; 1617 } 1618 1619 if (Deprecated.isValid() && Obsoleted.isValid() && 1620 !(Deprecated.Version <= Obsoleted.Version)) { 1621 S.Diag(Deprecated.KeywordLoc, diag::warn_availability_version_ordering) 1622 << 2 << PlatformName << Obsoleted.Version.getAsString() 1623 << 1 << Deprecated.Version.getAsString(); 1624 return; 1625 } 1626 1627 D->addAttr(::new (S.Context) AvailabilityAttr(Attr.getRange(), S.Context, 1628 Platform, 1629 Introduced.Version, 1630 Deprecated.Version, 1631 Obsoleted.Version, 1632 IsUnavailable)); 1633 } 1634 1635 static void handleVisibilityAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1636 // check the attribute arguments. 1637 if(!checkAttributeNumArgs(S, Attr, 1)) 1638 return; 1639 1640 Expr *Arg = Attr.getArg(0); 1641 Arg = Arg->IgnoreParenCasts(); 1642 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 1643 1644 if (!Str || !Str->isAscii()) { 1645 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1646 << "visibility" << 1; 1647 return; 1648 } 1649 1650 StringRef TypeStr = Str->getString(); 1651 VisibilityAttr::VisibilityType type; 1652 1653 if (TypeStr == "default") 1654 type = VisibilityAttr::Default; 1655 else if (TypeStr == "hidden") 1656 type = VisibilityAttr::Hidden; 1657 else if (TypeStr == "internal") 1658 type = VisibilityAttr::Hidden; // FIXME 1659 else if (TypeStr == "protected") 1660 type = VisibilityAttr::Protected; 1661 else { 1662 S.Diag(Attr.getLoc(), diag::warn_attribute_unknown_visibility) << TypeStr; 1663 return; 1664 } 1665 1666 D->addAttr(::new (S.Context) VisibilityAttr(Attr.getRange(), S.Context, type)); 1667 } 1668 1669 static void handleObjCMethodFamilyAttr(Sema &S, Decl *decl, 1670 const AttributeList &Attr) { 1671 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(decl); 1672 if (!method) { 1673 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_decl_type) 1674 << ExpectedMethod; 1675 return; 1676 } 1677 1678 if (Attr.getNumArgs() != 0 || !Attr.getParameterName()) { 1679 if (!Attr.getParameterName() && Attr.getNumArgs() == 1) { 1680 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1681 << "objc_method_family" << 1; 1682 } else { 1683 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1684 } 1685 Attr.setInvalid(); 1686 return; 1687 } 1688 1689 StringRef param = Attr.getParameterName()->getName(); 1690 ObjCMethodFamilyAttr::FamilyKind family; 1691 if (param == "none") 1692 family = ObjCMethodFamilyAttr::OMF_None; 1693 else if (param == "alloc") 1694 family = ObjCMethodFamilyAttr::OMF_alloc; 1695 else if (param == "copy") 1696 family = ObjCMethodFamilyAttr::OMF_copy; 1697 else if (param == "init") 1698 family = ObjCMethodFamilyAttr::OMF_init; 1699 else if (param == "mutableCopy") 1700 family = ObjCMethodFamilyAttr::OMF_mutableCopy; 1701 else if (param == "new") 1702 family = ObjCMethodFamilyAttr::OMF_new; 1703 else { 1704 // Just warn and ignore it. This is future-proof against new 1705 // families being used in system headers. 1706 S.Diag(Attr.getParameterLoc(), diag::warn_unknown_method_family); 1707 return; 1708 } 1709 1710 if (family == ObjCMethodFamilyAttr::OMF_init && 1711 !method->getResultType()->isObjCObjectPointerType()) { 1712 S.Diag(method->getLocation(), diag::err_init_method_bad_return_type) 1713 << method->getResultType(); 1714 // Ignore the attribute. 1715 return; 1716 } 1717 1718 method->addAttr(new (S.Context) ObjCMethodFamilyAttr(Attr.getRange(), 1719 S.Context, family)); 1720 } 1721 1722 static void handleObjCExceptionAttr(Sema &S, Decl *D, 1723 const AttributeList &Attr) { 1724 if (!checkAttributeNumArgs(S, Attr, 0)) 1725 return; 1726 1727 ObjCInterfaceDecl *OCI = dyn_cast<ObjCInterfaceDecl>(D); 1728 if (OCI == 0) { 1729 S.Diag(Attr.getLoc(), diag::err_attribute_requires_objc_interface); 1730 return; 1731 } 1732 1733 D->addAttr(::new (S.Context) ObjCExceptionAttr(Attr.getRange(), S.Context)); 1734 } 1735 1736 static void handleObjCNSObject(Sema &S, Decl *D, const AttributeList &Attr) { 1737 if (Attr.getNumArgs() != 0) { 1738 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1739 return; 1740 } 1741 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) { 1742 QualType T = TD->getUnderlyingType(); 1743 if (!T->isPointerType() || 1744 !T->getAs<PointerType>()->getPointeeType()->isRecordType()) { 1745 S.Diag(TD->getLocation(), diag::err_nsobject_attribute); 1746 return; 1747 } 1748 } 1749 D->addAttr(::new (S.Context) ObjCNSObjectAttr(Attr.getRange(), S.Context)); 1750 } 1751 1752 static void 1753 handleOverloadableAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1754 if (Attr.getNumArgs() != 0) { 1755 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1756 return; 1757 } 1758 1759 if (!isa<FunctionDecl>(D)) { 1760 S.Diag(Attr.getLoc(), diag::err_attribute_overloadable_not_function); 1761 return; 1762 } 1763 1764 D->addAttr(::new (S.Context) OverloadableAttr(Attr.getRange(), S.Context)); 1765 } 1766 1767 static void handleBlocksAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1768 if (!Attr.getParameterName()) { 1769 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1770 << "blocks" << 1; 1771 return; 1772 } 1773 1774 if (Attr.getNumArgs() != 0) { 1775 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1776 return; 1777 } 1778 1779 BlocksAttr::BlockType type; 1780 if (Attr.getParameterName()->isStr("byref")) 1781 type = BlocksAttr::ByRef; 1782 else { 1783 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1784 << "blocks" << Attr.getParameterName(); 1785 return; 1786 } 1787 1788 D->addAttr(::new (S.Context) BlocksAttr(Attr.getRange(), S.Context, type)); 1789 } 1790 1791 static void handleSentinelAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1792 // check the attribute arguments. 1793 if (Attr.getNumArgs() > 2) { 1794 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 2; 1795 return; 1796 } 1797 1798 unsigned sentinel = 0; 1799 if (Attr.getNumArgs() > 0) { 1800 Expr *E = Attr.getArg(0); 1801 llvm::APSInt Idx(32); 1802 if (E->isTypeDependent() || E->isValueDependent() || 1803 !E->isIntegerConstantExpr(Idx, S.Context)) { 1804 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 1805 << "sentinel" << 1 << E->getSourceRange(); 1806 return; 1807 } 1808 1809 if (Idx.isSigned() && Idx.isNegative()) { 1810 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero) 1811 << E->getSourceRange(); 1812 return; 1813 } 1814 1815 sentinel = Idx.getZExtValue(); 1816 } 1817 1818 unsigned nullPos = 0; 1819 if (Attr.getNumArgs() > 1) { 1820 Expr *E = Attr.getArg(1); 1821 llvm::APSInt Idx(32); 1822 if (E->isTypeDependent() || E->isValueDependent() || 1823 !E->isIntegerConstantExpr(Idx, S.Context)) { 1824 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 1825 << "sentinel" << 2 << E->getSourceRange(); 1826 return; 1827 } 1828 nullPos = Idx.getZExtValue(); 1829 1830 if ((Idx.isSigned() && Idx.isNegative()) || nullPos > 1) { 1831 // FIXME: This error message could be improved, it would be nice 1832 // to say what the bounds actually are. 1833 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one) 1834 << E->getSourceRange(); 1835 return; 1836 } 1837 } 1838 1839 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1840 const FunctionType *FT = FD->getType()->castAs<FunctionType>(); 1841 if (isa<FunctionNoProtoType>(FT)) { 1842 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_named_arguments); 1843 return; 1844 } 1845 1846 if (!cast<FunctionProtoType>(FT)->isVariadic()) { 1847 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0; 1848 return; 1849 } 1850 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 1851 if (!MD->isVariadic()) { 1852 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << 0; 1853 return; 1854 } 1855 } else if (isa<BlockDecl>(D)) { 1856 // Note! BlockDecl is typeless. Variadic diagnostics will be issued by the 1857 // caller. 1858 ; 1859 } else if (const VarDecl *V = dyn_cast<VarDecl>(D)) { 1860 QualType Ty = V->getType(); 1861 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 1862 const FunctionType *FT = Ty->isFunctionPointerType() ? getFunctionType(D) 1863 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>(); 1864 if (!cast<FunctionProtoType>(FT)->isVariadic()) { 1865 int m = Ty->isFunctionPointerType() ? 0 : 1; 1866 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic) << m; 1867 return; 1868 } 1869 } else { 1870 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1871 << Attr.getName() << ExpectedFunctionMethodOrBlock; 1872 return; 1873 } 1874 } else { 1875 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1876 << Attr.getName() << ExpectedFunctionMethodOrBlock; 1877 return; 1878 } 1879 D->addAttr(::new (S.Context) SentinelAttr(Attr.getRange(), S.Context, sentinel, 1880 nullPos)); 1881 } 1882 1883 static void handleWarnUnusedResult(Sema &S, Decl *D, const AttributeList &Attr) { 1884 // check the attribute arguments. 1885 if (!checkAttributeNumArgs(S, Attr, 0)) 1886 return; 1887 1888 if (!isFunction(D) && !isa<ObjCMethodDecl>(D)) { 1889 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1890 << Attr.getName() << ExpectedFunctionOrMethod; 1891 return; 1892 } 1893 1894 if (isFunction(D) && getFunctionType(D)->getResultType()->isVoidType()) { 1895 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method) 1896 << Attr.getName() << 0; 1897 return; 1898 } 1899 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) 1900 if (MD->getResultType()->isVoidType()) { 1901 S.Diag(Attr.getLoc(), diag::warn_attribute_void_function_method) 1902 << Attr.getName() << 1; 1903 return; 1904 } 1905 1906 D->addAttr(::new (S.Context) WarnUnusedResultAttr(Attr.getRange(), S.Context)); 1907 } 1908 1909 static void handleWeakAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1910 // check the attribute arguments. 1911 if (Attr.hasParameterOrArguments()) { 1912 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1913 return; 1914 } 1915 1916 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) { 1917 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1918 << Attr.getName() << ExpectedVariableOrFunction; 1919 return; 1920 } 1921 1922 NamedDecl *nd = cast<NamedDecl>(D); 1923 1924 // 'weak' only applies to declarations with external linkage. 1925 if (hasEffectivelyInternalLinkage(nd)) { 1926 S.Diag(Attr.getLoc(), diag::err_attribute_weak_static); 1927 return; 1928 } 1929 1930 nd->addAttr(::new (S.Context) WeakAttr(Attr.getRange(), S.Context)); 1931 } 1932 1933 static void handleWeakImportAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1934 // check the attribute arguments. 1935 if (!checkAttributeNumArgs(S, Attr, 0)) 1936 return; 1937 1938 1939 // weak_import only applies to variable & function declarations. 1940 bool isDef = false; 1941 if (!D->canBeWeakImported(isDef)) { 1942 if (isDef) 1943 S.Diag(Attr.getLoc(), 1944 diag::warn_attribute_weak_import_invalid_on_definition) 1945 << "weak_import" << 2 /*variable and function*/; 1946 else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) || 1947 (S.Context.getTargetInfo().getTriple().isOSDarwin() && 1948 isa<ObjCInterfaceDecl>(D))) { 1949 // Nothing to warn about here. 1950 } else 1951 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1952 << Attr.getName() << ExpectedVariableOrFunction; 1953 1954 return; 1955 } 1956 1957 D->addAttr(::new (S.Context) WeakImportAttr(Attr.getRange(), S.Context)); 1958 } 1959 1960 static void handleReqdWorkGroupSize(Sema &S, Decl *D, 1961 const AttributeList &Attr) { 1962 // Attribute has 3 arguments. 1963 if (!checkAttributeNumArgs(S, Attr, 3)) 1964 return; 1965 1966 unsigned WGSize[3]; 1967 for (unsigned i = 0; i < 3; ++i) { 1968 Expr *E = Attr.getArg(i); 1969 llvm::APSInt ArgNum(32); 1970 if (E->isTypeDependent() || E->isValueDependent() || 1971 !E->isIntegerConstantExpr(ArgNum, S.Context)) { 1972 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1973 << "reqd_work_group_size" << E->getSourceRange(); 1974 return; 1975 } 1976 WGSize[i] = (unsigned) ArgNum.getZExtValue(); 1977 } 1978 D->addAttr(::new (S.Context) ReqdWorkGroupSizeAttr(Attr.getRange(), S.Context, 1979 WGSize[0], WGSize[1], 1980 WGSize[2])); 1981 } 1982 1983 static void handleSectionAttr(Sema &S, Decl *D, const AttributeList &Attr) { 1984 // Attribute has no arguments. 1985 if (!checkAttributeNumArgs(S, Attr, 1)) 1986 return; 1987 1988 // Make sure that there is a string literal as the sections's single 1989 // argument. 1990 Expr *ArgExpr = Attr.getArg(0); 1991 StringLiteral *SE = dyn_cast<StringLiteral>(ArgExpr); 1992 if (!SE) { 1993 S.Diag(ArgExpr->getLocStart(), diag::err_attribute_not_string) << "section"; 1994 return; 1995 } 1996 1997 // If the target wants to validate the section specifier, make it happen. 1998 std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(SE->getString()); 1999 if (!Error.empty()) { 2000 S.Diag(SE->getLocStart(), diag::err_attribute_section_invalid_for_target) 2001 << Error; 2002 return; 2003 } 2004 2005 // This attribute cannot be applied to local variables. 2006 if (isa<VarDecl>(D) && cast<VarDecl>(D)->hasLocalStorage()) { 2007 S.Diag(SE->getLocStart(), diag::err_attribute_section_local_variable); 2008 return; 2009 } 2010 2011 D->addAttr(::new (S.Context) SectionAttr(Attr.getRange(), S.Context, 2012 SE->getString())); 2013 } 2014 2015 2016 static void handleNothrowAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2017 // check the attribute arguments. 2018 if (Attr.hasParameterOrArguments()) { 2019 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 2020 return; 2021 } 2022 2023 if (NoThrowAttr *Existing = D->getAttr<NoThrowAttr>()) { 2024 if (Existing->getLocation().isInvalid()) 2025 Existing->setRange(Attr.getRange()); 2026 } else { 2027 D->addAttr(::new (S.Context) NoThrowAttr(Attr.getRange(), S.Context)); 2028 } 2029 } 2030 2031 static void handleConstAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2032 // check the attribute arguments. 2033 if (Attr.hasParameterOrArguments()) { 2034 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 2035 return; 2036 } 2037 2038 if (ConstAttr *Existing = D->getAttr<ConstAttr>()) { 2039 if (Existing->getLocation().isInvalid()) 2040 Existing->setRange(Attr.getRange()); 2041 } else { 2042 D->addAttr(::new (S.Context) ConstAttr(Attr.getRange(), S.Context)); 2043 } 2044 } 2045 2046 static void handlePureAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2047 // check the attribute arguments. 2048 if (!checkAttributeNumArgs(S, Attr, 0)) 2049 return; 2050 2051 D->addAttr(::new (S.Context) PureAttr(Attr.getRange(), S.Context)); 2052 } 2053 2054 static void handleCleanupAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2055 if (!Attr.getParameterName()) { 2056 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 2057 return; 2058 } 2059 2060 if (Attr.getNumArgs() != 0) { 2061 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 2062 return; 2063 } 2064 2065 VarDecl *VD = dyn_cast<VarDecl>(D); 2066 2067 if (!VD || !VD->hasLocalStorage()) { 2068 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "cleanup"; 2069 return; 2070 } 2071 2072 // Look up the function 2073 // FIXME: Lookup probably isn't looking in the right place 2074 NamedDecl *CleanupDecl 2075 = S.LookupSingleName(S.TUScope, Attr.getParameterName(), 2076 Attr.getParameterLoc(), Sema::LookupOrdinaryName); 2077 if (!CleanupDecl) { 2078 S.Diag(Attr.getParameterLoc(), diag::err_attribute_cleanup_arg_not_found) << 2079 Attr.getParameterName(); 2080 return; 2081 } 2082 2083 FunctionDecl *FD = dyn_cast<FunctionDecl>(CleanupDecl); 2084 if (!FD) { 2085 S.Diag(Attr.getParameterLoc(), 2086 diag::err_attribute_cleanup_arg_not_function) 2087 << Attr.getParameterName(); 2088 return; 2089 } 2090 2091 if (FD->getNumParams() != 1) { 2092 S.Diag(Attr.getParameterLoc(), 2093 diag::err_attribute_cleanup_func_must_take_one_arg) 2094 << Attr.getParameterName(); 2095 return; 2096 } 2097 2098 // We're currently more strict than GCC about what function types we accept. 2099 // If this ever proves to be a problem it should be easy to fix. 2100 QualType Ty = S.Context.getPointerType(VD->getType()); 2101 QualType ParamTy = FD->getParamDecl(0)->getType(); 2102 if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(), 2103 ParamTy, Ty) != Sema::Compatible) { 2104 S.Diag(Attr.getParameterLoc(), 2105 diag::err_attribute_cleanup_func_arg_incompatible_type) << 2106 Attr.getParameterName() << ParamTy << Ty; 2107 return; 2108 } 2109 2110 D->addAttr(::new (S.Context) CleanupAttr(Attr.getRange(), S.Context, FD)); 2111 S.MarkDeclarationReferenced(Attr.getParameterLoc(), FD); 2112 } 2113 2114 /// Handle __attribute__((format_arg((idx)))) attribute based on 2115 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2116 static void handleFormatArgAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2117 if (!checkAttributeNumArgs(S, Attr, 1)) 2118 return; 2119 2120 if (!isFunctionOrMethod(D) || !hasFunctionProto(D)) { 2121 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2122 << Attr.getName() << ExpectedFunction; 2123 return; 2124 } 2125 2126 // In C++ the implicit 'this' function parameter also counts, and they are 2127 // counted from one. 2128 bool HasImplicitThisParam = isInstanceMethod(D); 2129 unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam; 2130 unsigned FirstIdx = 1; 2131 2132 // checks for the 2nd argument 2133 Expr *IdxExpr = Attr.getArg(0); 2134 llvm::APSInt Idx(32); 2135 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() || 2136 !IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { 2137 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 2138 << "format" << 2 << IdxExpr->getSourceRange(); 2139 return; 2140 } 2141 2142 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2143 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 2144 << "format" << 2 << IdxExpr->getSourceRange(); 2145 return; 2146 } 2147 2148 unsigned ArgIdx = Idx.getZExtValue() - 1; 2149 2150 if (HasImplicitThisParam) { 2151 if (ArgIdx == 0) { 2152 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_implicit_this_argument) 2153 << "format_arg" << IdxExpr->getSourceRange(); 2154 return; 2155 } 2156 ArgIdx--; 2157 } 2158 2159 // make sure the format string is really a string 2160 QualType Ty = getFunctionOrMethodArgType(D, ArgIdx); 2161 2162 bool not_nsstring_type = !isNSStringType(Ty, S.Context); 2163 if (not_nsstring_type && 2164 !isCFStringType(Ty, S.Context) && 2165 (!Ty->isPointerType() || 2166 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) { 2167 // FIXME: Should highlight the actual expression that has the wrong type. 2168 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 2169 << (not_nsstring_type ? "a string type" : "an NSString") 2170 << IdxExpr->getSourceRange(); 2171 return; 2172 } 2173 Ty = getFunctionOrMethodResultType(D); 2174 if (!isNSStringType(Ty, S.Context) && 2175 !isCFStringType(Ty, S.Context) && 2176 (!Ty->isPointerType() || 2177 !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) { 2178 // FIXME: Should highlight the actual expression that has the wrong type. 2179 S.Diag(Attr.getLoc(), diag::err_format_attribute_result_not) 2180 << (not_nsstring_type ? "string type" : "NSString") 2181 << IdxExpr->getSourceRange(); 2182 return; 2183 } 2184 2185 D->addAttr(::new (S.Context) FormatArgAttr(Attr.getRange(), S.Context, 2186 Idx.getZExtValue())); 2187 } 2188 2189 enum FormatAttrKind { 2190 CFStringFormat, 2191 NSStringFormat, 2192 StrftimeFormat, 2193 SupportedFormat, 2194 IgnoredFormat, 2195 InvalidFormat 2196 }; 2197 2198 /// getFormatAttrKind - Map from format attribute names to supported format 2199 /// types. 2200 static FormatAttrKind getFormatAttrKind(StringRef Format) { 2201 // Check for formats that get handled specially. 2202 if (Format == "NSString") 2203 return NSStringFormat; 2204 if (Format == "CFString") 2205 return CFStringFormat; 2206 if (Format == "strftime") 2207 return StrftimeFormat; 2208 2209 // Otherwise, check for supported formats. 2210 if (Format == "scanf" || Format == "printf" || Format == "printf0" || 2211 Format == "strfmon" || Format == "cmn_err" || Format == "strftime" || 2212 Format == "NSString" || Format == "CFString" || Format == "vcmn_err" || 2213 Format == "zcmn_err" || 2214 Format == "kprintf") // OpenBSD. 2215 return SupportedFormat; 2216 2217 if (Format == "gcc_diag" || Format == "gcc_cdiag" || 2218 Format == "gcc_cxxdiag" || Format == "gcc_tdiag") 2219 return IgnoredFormat; 2220 2221 return InvalidFormat; 2222 } 2223 2224 /// Handle __attribute__((init_priority(priority))) attributes based on 2225 /// http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html 2226 static void handleInitPriorityAttr(Sema &S, Decl *D, 2227 const AttributeList &Attr) { 2228 if (!S.getLangOptions().CPlusPlus) { 2229 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); 2230 return; 2231 } 2232 2233 if (!isa<VarDecl>(D) || S.getCurFunctionOrMethodDecl()) { 2234 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr); 2235 Attr.setInvalid(); 2236 return; 2237 } 2238 QualType T = dyn_cast<VarDecl>(D)->getType(); 2239 if (S.Context.getAsArrayType(T)) 2240 T = S.Context.getBaseElementType(T); 2241 if (!T->getAs<RecordType>()) { 2242 S.Diag(Attr.getLoc(), diag::err_init_priority_object_attr); 2243 Attr.setInvalid(); 2244 return; 2245 } 2246 2247 if (Attr.getNumArgs() != 1) { 2248 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 2249 Attr.setInvalid(); 2250 return; 2251 } 2252 Expr *priorityExpr = Attr.getArg(0); 2253 2254 llvm::APSInt priority(32); 2255 if (priorityExpr->isTypeDependent() || priorityExpr->isValueDependent() || 2256 !priorityExpr->isIntegerConstantExpr(priority, S.Context)) { 2257 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 2258 << "init_priority" << priorityExpr->getSourceRange(); 2259 Attr.setInvalid(); 2260 return; 2261 } 2262 unsigned prioritynum = priority.getZExtValue(); 2263 if (prioritynum < 101 || prioritynum > 65535) { 2264 S.Diag(Attr.getLoc(), diag::err_attribute_argument_outof_range) 2265 << priorityExpr->getSourceRange(); 2266 Attr.setInvalid(); 2267 return; 2268 } 2269 D->addAttr(::new (S.Context) InitPriorityAttr(Attr.getRange(), S.Context, 2270 prioritynum)); 2271 } 2272 2273 /// Handle __attribute__((format(type,idx,firstarg))) attributes based on 2274 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2275 static void handleFormatAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2276 2277 if (!Attr.getParameterName()) { 2278 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 2279 << "format" << 1; 2280 return; 2281 } 2282 2283 if (Attr.getNumArgs() != 2) { 2284 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 3; 2285 return; 2286 } 2287 2288 if (!isFunctionOrMethodOrBlock(D) || !hasFunctionProto(D)) { 2289 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2290 << Attr.getName() << ExpectedFunction; 2291 return; 2292 } 2293 2294 // In C++ the implicit 'this' function parameter also counts, and they are 2295 // counted from one. 2296 bool HasImplicitThisParam = isInstanceMethod(D); 2297 unsigned NumArgs = getFunctionOrMethodNumArgs(D) + HasImplicitThisParam; 2298 unsigned FirstIdx = 1; 2299 2300 StringRef Format = Attr.getParameterName()->getName(); 2301 2302 // Normalize the argument, __foo__ becomes foo. 2303 if (Format.startswith("__") && Format.endswith("__")) 2304 Format = Format.substr(2, Format.size() - 4); 2305 2306 // Check for supported formats. 2307 FormatAttrKind Kind = getFormatAttrKind(Format); 2308 2309 if (Kind == IgnoredFormat) 2310 return; 2311 2312 if (Kind == InvalidFormat) { 2313 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 2314 << "format" << Attr.getParameterName()->getName(); 2315 return; 2316 } 2317 2318 // checks for the 2nd argument 2319 Expr *IdxExpr = Attr.getArg(0); 2320 llvm::APSInt Idx(32); 2321 if (IdxExpr->isTypeDependent() || IdxExpr->isValueDependent() || 2322 !IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { 2323 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 2324 << "format" << 2 << IdxExpr->getSourceRange(); 2325 return; 2326 } 2327 2328 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2329 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 2330 << "format" << 2 << IdxExpr->getSourceRange(); 2331 return; 2332 } 2333 2334 // FIXME: Do we need to bounds check? 2335 unsigned ArgIdx = Idx.getZExtValue() - 1; 2336 2337 if (HasImplicitThisParam) { 2338 if (ArgIdx == 0) { 2339 S.Diag(Attr.getLoc(), 2340 diag::err_format_attribute_implicit_this_format_string) 2341 << IdxExpr->getSourceRange(); 2342 return; 2343 } 2344 ArgIdx--; 2345 } 2346 2347 // make sure the format string is really a string 2348 QualType Ty = getFunctionOrMethodArgType(D, ArgIdx); 2349 2350 if (Kind == CFStringFormat) { 2351 if (!isCFStringType(Ty, S.Context)) { 2352 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 2353 << "a CFString" << IdxExpr->getSourceRange(); 2354 return; 2355 } 2356 } else if (Kind == NSStringFormat) { 2357 // FIXME: do we need to check if the type is NSString*? What are the 2358 // semantics? 2359 if (!isNSStringType(Ty, S.Context)) { 2360 // FIXME: Should highlight the actual expression that has the wrong type. 2361 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 2362 << "an NSString" << IdxExpr->getSourceRange(); 2363 return; 2364 } 2365 } else if (!Ty->isPointerType() || 2366 !Ty->getAs<PointerType>()->getPointeeType()->isCharType()) { 2367 // FIXME: Should highlight the actual expression that has the wrong type. 2368 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 2369 << "a string type" << IdxExpr->getSourceRange(); 2370 return; 2371 } 2372 2373 // check the 3rd argument 2374 Expr *FirstArgExpr = Attr.getArg(1); 2375 llvm::APSInt FirstArg(32); 2376 if (FirstArgExpr->isTypeDependent() || FirstArgExpr->isValueDependent() || 2377 !FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) { 2378 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 2379 << "format" << 3 << FirstArgExpr->getSourceRange(); 2380 return; 2381 } 2382 2383 // check if the function is variadic if the 3rd argument non-zero 2384 if (FirstArg != 0) { 2385 if (isFunctionOrMethodVariadic(D)) { 2386 ++NumArgs; // +1 for ... 2387 } else { 2388 S.Diag(D->getLocation(), diag::err_format_attribute_requires_variadic); 2389 return; 2390 } 2391 } 2392 2393 // strftime requires FirstArg to be 0 because it doesn't read from any 2394 // variable the input is just the current time + the format string. 2395 if (Kind == StrftimeFormat) { 2396 if (FirstArg != 0) { 2397 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter) 2398 << FirstArgExpr->getSourceRange(); 2399 return; 2400 } 2401 // if 0 it disables parameter checking (to use with e.g. va_list) 2402 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2403 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 2404 << "format" << 3 << FirstArgExpr->getSourceRange(); 2405 return; 2406 } 2407 2408 // Check whether we already have an equivalent format attribute. 2409 for (specific_attr_iterator<FormatAttr> 2410 i = D->specific_attr_begin<FormatAttr>(), 2411 e = D->specific_attr_end<FormatAttr>(); 2412 i != e ; ++i) { 2413 FormatAttr *f = *i; 2414 if (f->getType() == Format && 2415 f->getFormatIdx() == (int)Idx.getZExtValue() && 2416 f->getFirstArg() == (int)FirstArg.getZExtValue()) { 2417 // If we don't have a valid location for this attribute, adopt the 2418 // location. 2419 if (f->getLocation().isInvalid()) 2420 f->setRange(Attr.getRange()); 2421 return; 2422 } 2423 } 2424 2425 D->addAttr(::new (S.Context) FormatAttr(Attr.getRange(), S.Context, Format, 2426 Idx.getZExtValue(), 2427 FirstArg.getZExtValue())); 2428 } 2429 2430 static void handleTransparentUnionAttr(Sema &S, Decl *D, 2431 const AttributeList &Attr) { 2432 // check the attribute arguments. 2433 if (!checkAttributeNumArgs(S, Attr, 0)) 2434 return; 2435 2436 2437 // Try to find the underlying union declaration. 2438 RecordDecl *RD = 0; 2439 TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D); 2440 if (TD && TD->getUnderlyingType()->isUnionType()) 2441 RD = TD->getUnderlyingType()->getAsUnionType()->getDecl(); 2442 else 2443 RD = dyn_cast<RecordDecl>(D); 2444 2445 if (!RD || !RD->isUnion()) { 2446 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2447 << Attr.getName() << ExpectedUnion; 2448 return; 2449 } 2450 2451 if (!RD->isCompleteDefinition()) { 2452 S.Diag(Attr.getLoc(), 2453 diag::warn_transparent_union_attribute_not_definition); 2454 return; 2455 } 2456 2457 RecordDecl::field_iterator Field = RD->field_begin(), 2458 FieldEnd = RD->field_end(); 2459 if (Field == FieldEnd) { 2460 S.Diag(Attr.getLoc(), diag::warn_transparent_union_attribute_zero_fields); 2461 return; 2462 } 2463 2464 FieldDecl *FirstField = *Field; 2465 QualType FirstType = FirstField->getType(); 2466 if (FirstType->hasFloatingRepresentation() || FirstType->isVectorType()) { 2467 S.Diag(FirstField->getLocation(), 2468 diag::warn_transparent_union_attribute_floating) 2469 << FirstType->isVectorType() << FirstType; 2470 return; 2471 } 2472 2473 uint64_t FirstSize = S.Context.getTypeSize(FirstType); 2474 uint64_t FirstAlign = S.Context.getTypeAlign(FirstType); 2475 for (; Field != FieldEnd; ++Field) { 2476 QualType FieldType = Field->getType(); 2477 if (S.Context.getTypeSize(FieldType) != FirstSize || 2478 S.Context.getTypeAlign(FieldType) != FirstAlign) { 2479 // Warn if we drop the attribute. 2480 bool isSize = S.Context.getTypeSize(FieldType) != FirstSize; 2481 unsigned FieldBits = isSize? S.Context.getTypeSize(FieldType) 2482 : S.Context.getTypeAlign(FieldType); 2483 S.Diag(Field->getLocation(), 2484 diag::warn_transparent_union_attribute_field_size_align) 2485 << isSize << Field->getDeclName() << FieldBits; 2486 unsigned FirstBits = isSize? FirstSize : FirstAlign; 2487 S.Diag(FirstField->getLocation(), 2488 diag::note_transparent_union_first_field_size_align) 2489 << isSize << FirstBits; 2490 return; 2491 } 2492 } 2493 2494 RD->addAttr(::new (S.Context) TransparentUnionAttr(Attr.getRange(), S.Context)); 2495 } 2496 2497 static void handleAnnotateAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2498 // check the attribute arguments. 2499 if (!checkAttributeNumArgs(S, Attr, 1)) 2500 return; 2501 2502 Expr *ArgExpr = Attr.getArg(0); 2503 StringLiteral *SE = dyn_cast<StringLiteral>(ArgExpr); 2504 2505 // Make sure that there is a string literal as the annotation's single 2506 // argument. 2507 if (!SE) { 2508 S.Diag(ArgExpr->getLocStart(), diag::err_attribute_not_string) <<"annotate"; 2509 return; 2510 } 2511 2512 // Don't duplicate annotations that are already set. 2513 for (specific_attr_iterator<AnnotateAttr> 2514 i = D->specific_attr_begin<AnnotateAttr>(), 2515 e = D->specific_attr_end<AnnotateAttr>(); i != e; ++i) { 2516 if ((*i)->getAnnotation() == SE->getString()) 2517 return; 2518 } 2519 D->addAttr(::new (S.Context) AnnotateAttr(Attr.getRange(), S.Context, 2520 SE->getString())); 2521 } 2522 2523 static void handleAlignedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2524 // check the attribute arguments. 2525 if (Attr.getNumArgs() > 1) { 2526 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 2527 return; 2528 } 2529 2530 //FIXME: The C++0x version of this attribute has more limited applicabilty 2531 // than GNU's, and should error out when it is used to specify a 2532 // weaker alignment, rather than being silently ignored. 2533 2534 if (Attr.getNumArgs() == 0) { 2535 D->addAttr(::new (S.Context) AlignedAttr(Attr.getRange(), S.Context, true, 0)); 2536 return; 2537 } 2538 2539 S.AddAlignedAttr(Attr.getRange(), D, Attr.getArg(0)); 2540 } 2541 2542 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E) { 2543 if (E->isTypeDependent() || E->isValueDependent()) { 2544 // Save dependent expressions in the AST to be instantiated. 2545 D->addAttr(::new (Context) AlignedAttr(AttrRange, Context, true, E)); 2546 return; 2547 } 2548 2549 SourceLocation AttrLoc = AttrRange.getBegin(); 2550 // FIXME: Cache the number on the Attr object? 2551 llvm::APSInt Alignment(32); 2552 if (!E->isIntegerConstantExpr(Alignment, Context)) { 2553 Diag(AttrLoc, diag::err_attribute_argument_not_int) 2554 << "aligned" << E->getSourceRange(); 2555 return; 2556 } 2557 if (!llvm::isPowerOf2_64(Alignment.getZExtValue())) { 2558 Diag(AttrLoc, diag::err_attribute_aligned_not_power_of_two) 2559 << E->getSourceRange(); 2560 return; 2561 } 2562 2563 D->addAttr(::new (Context) AlignedAttr(AttrRange, Context, true, E)); 2564 } 2565 2566 void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS) { 2567 // FIXME: Cache the number on the Attr object if non-dependent? 2568 // FIXME: Perform checking of type validity 2569 D->addAttr(::new (Context) AlignedAttr(AttrRange, Context, false, TS)); 2570 return; 2571 } 2572 2573 /// handleModeAttr - This attribute modifies the width of a decl with primitive 2574 /// type. 2575 /// 2576 /// Despite what would be logical, the mode attribute is a decl attribute, not a 2577 /// type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 'G' be 2578 /// HImode, not an intermediate pointer. 2579 static void handleModeAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2580 // This attribute isn't documented, but glibc uses it. It changes 2581 // the width of an int or unsigned int to the specified size. 2582 2583 // Check that there aren't any arguments 2584 if (!checkAttributeNumArgs(S, Attr, 0)) 2585 return; 2586 2587 2588 IdentifierInfo *Name = Attr.getParameterName(); 2589 if (!Name) { 2590 S.Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name); 2591 return; 2592 } 2593 2594 StringRef Str = Attr.getParameterName()->getName(); 2595 2596 // Normalize the attribute name, __foo__ becomes foo. 2597 if (Str.startswith("__") && Str.endswith("__")) 2598 Str = Str.substr(2, Str.size() - 4); 2599 2600 unsigned DestWidth = 0; 2601 bool IntegerMode = true; 2602 bool ComplexMode = false; 2603 switch (Str.size()) { 2604 case 2: 2605 switch (Str[0]) { 2606 case 'Q': DestWidth = 8; break; 2607 case 'H': DestWidth = 16; break; 2608 case 'S': DestWidth = 32; break; 2609 case 'D': DestWidth = 64; break; 2610 case 'X': DestWidth = 96; break; 2611 case 'T': DestWidth = 128; break; 2612 } 2613 if (Str[1] == 'F') { 2614 IntegerMode = false; 2615 } else if (Str[1] == 'C') { 2616 IntegerMode = false; 2617 ComplexMode = true; 2618 } else if (Str[1] != 'I') { 2619 DestWidth = 0; 2620 } 2621 break; 2622 case 4: 2623 // FIXME: glibc uses 'word' to define register_t; this is narrower than a 2624 // pointer on PIC16 and other embedded platforms. 2625 if (Str == "word") 2626 DestWidth = S.Context.getTargetInfo().getPointerWidth(0); 2627 else if (Str == "byte") 2628 DestWidth = S.Context.getTargetInfo().getCharWidth(); 2629 break; 2630 case 7: 2631 if (Str == "pointer") 2632 DestWidth = S.Context.getTargetInfo().getPointerWidth(0); 2633 break; 2634 } 2635 2636 QualType OldTy; 2637 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) 2638 OldTy = TD->getUnderlyingType(); 2639 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) 2640 OldTy = VD->getType(); 2641 else { 2642 S.Diag(D->getLocation(), diag::err_attr_wrong_decl) 2643 << "mode" << Attr.getRange(); 2644 return; 2645 } 2646 2647 if (!OldTy->getAs<BuiltinType>() && !OldTy->isComplexType()) 2648 S.Diag(Attr.getLoc(), diag::err_mode_not_primitive); 2649 else if (IntegerMode) { 2650 if (!OldTy->isIntegralOrEnumerationType()) 2651 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); 2652 } else if (ComplexMode) { 2653 if (!OldTy->isComplexType()) 2654 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); 2655 } else { 2656 if (!OldTy->isFloatingType()) 2657 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); 2658 } 2659 2660 // FIXME: Sync this with InitializePredefinedMacros; we need to match int8_t 2661 // and friends, at least with glibc. 2662 // FIXME: Make sure 32/64-bit integers don't get defined to types of the wrong 2663 // width on unusual platforms. 2664 // FIXME: Make sure floating-point mappings are accurate 2665 // FIXME: Support XF and TF types 2666 QualType NewTy; 2667 switch (DestWidth) { 2668 case 0: 2669 S.Diag(Attr.getLoc(), diag::err_unknown_machine_mode) << Name; 2670 return; 2671 default: 2672 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 2673 return; 2674 case 8: 2675 if (!IntegerMode) { 2676 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 2677 return; 2678 } 2679 if (OldTy->isSignedIntegerType()) 2680 NewTy = S.Context.SignedCharTy; 2681 else 2682 NewTy = S.Context.UnsignedCharTy; 2683 break; 2684 case 16: 2685 if (!IntegerMode) { 2686 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 2687 return; 2688 } 2689 if (OldTy->isSignedIntegerType()) 2690 NewTy = S.Context.ShortTy; 2691 else 2692 NewTy = S.Context.UnsignedShortTy; 2693 break; 2694 case 32: 2695 if (!IntegerMode) 2696 NewTy = S.Context.FloatTy; 2697 else if (OldTy->isSignedIntegerType()) 2698 NewTy = S.Context.IntTy; 2699 else 2700 NewTy = S.Context.UnsignedIntTy; 2701 break; 2702 case 64: 2703 if (!IntegerMode) 2704 NewTy = S.Context.DoubleTy; 2705 else if (OldTy->isSignedIntegerType()) 2706 if (S.Context.getTargetInfo().getLongWidth() == 64) 2707 NewTy = S.Context.LongTy; 2708 else 2709 NewTy = S.Context.LongLongTy; 2710 else 2711 if (S.Context.getTargetInfo().getLongWidth() == 64) 2712 NewTy = S.Context.UnsignedLongTy; 2713 else 2714 NewTy = S.Context.UnsignedLongLongTy; 2715 break; 2716 case 96: 2717 NewTy = S.Context.LongDoubleTy; 2718 break; 2719 case 128: 2720 if (!IntegerMode) { 2721 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 2722 return; 2723 } 2724 if (OldTy->isSignedIntegerType()) 2725 NewTy = S.Context.Int128Ty; 2726 else 2727 NewTy = S.Context.UnsignedInt128Ty; 2728 break; 2729 } 2730 2731 if (ComplexMode) { 2732 NewTy = S.Context.getComplexType(NewTy); 2733 } 2734 2735 // Install the new type. 2736 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) { 2737 // FIXME: preserve existing source info. 2738 TD->setTypeSourceInfo(S.Context.getTrivialTypeSourceInfo(NewTy)); 2739 } else 2740 cast<ValueDecl>(D)->setType(NewTy); 2741 } 2742 2743 static void handleNoDebugAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2744 // check the attribute arguments. 2745 if (!checkAttributeNumArgs(S, Attr, 0)) 2746 return; 2747 2748 if (!isFunctionOrMethod(D)) { 2749 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2750 << Attr.getName() << ExpectedFunction; 2751 return; 2752 } 2753 2754 D->addAttr(::new (S.Context) NoDebugAttr(Attr.getRange(), S.Context)); 2755 } 2756 2757 static void handleNoInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2758 // check the attribute arguments. 2759 if (!checkAttributeNumArgs(S, Attr, 0)) 2760 return; 2761 2762 2763 if (!isa<FunctionDecl>(D)) { 2764 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2765 << Attr.getName() << ExpectedFunction; 2766 return; 2767 } 2768 2769 D->addAttr(::new (S.Context) NoInlineAttr(Attr.getRange(), S.Context)); 2770 } 2771 2772 static void handleNoInstrumentFunctionAttr(Sema &S, Decl *D, 2773 const AttributeList &Attr) { 2774 // check the attribute arguments. 2775 if (!checkAttributeNumArgs(S, Attr, 0)) 2776 return; 2777 2778 2779 if (!isa<FunctionDecl>(D)) { 2780 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2781 << Attr.getName() << ExpectedFunction; 2782 return; 2783 } 2784 2785 D->addAttr(::new (S.Context) NoInstrumentFunctionAttr(Attr.getRange(), 2786 S.Context)); 2787 } 2788 2789 static void handleConstantAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2790 if (S.LangOpts.CUDA) { 2791 // check the attribute arguments. 2792 if (Attr.hasParameterOrArguments()) { 2793 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 2794 return; 2795 } 2796 2797 if (!isa<VarDecl>(D)) { 2798 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2799 << Attr.getName() << ExpectedVariable; 2800 return; 2801 } 2802 2803 D->addAttr(::new (S.Context) CUDAConstantAttr(Attr.getRange(), S.Context)); 2804 } else { 2805 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "constant"; 2806 } 2807 } 2808 2809 static void handleDeviceAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2810 if (S.LangOpts.CUDA) { 2811 // check the attribute arguments. 2812 if (Attr.getNumArgs() != 0) { 2813 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 2814 return; 2815 } 2816 2817 if (!isa<FunctionDecl>(D) && !isa<VarDecl>(D)) { 2818 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2819 << Attr.getName() << ExpectedVariableOrFunction; 2820 return; 2821 } 2822 2823 D->addAttr(::new (S.Context) CUDADeviceAttr(Attr.getRange(), S.Context)); 2824 } else { 2825 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "device"; 2826 } 2827 } 2828 2829 static void handleGlobalAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2830 if (S.LangOpts.CUDA) { 2831 // check the attribute arguments. 2832 if (!checkAttributeNumArgs(S, Attr, 0)) 2833 return; 2834 2835 if (!isa<FunctionDecl>(D)) { 2836 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2837 << Attr.getName() << ExpectedFunction; 2838 return; 2839 } 2840 2841 FunctionDecl *FD = cast<FunctionDecl>(D); 2842 if (!FD->getResultType()->isVoidType()) { 2843 TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc().IgnoreParens(); 2844 if (FunctionTypeLoc* FTL = dyn_cast<FunctionTypeLoc>(&TL)) { 2845 S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return) 2846 << FD->getType() 2847 << FixItHint::CreateReplacement(FTL->getResultLoc().getSourceRange(), 2848 "void"); 2849 } else { 2850 S.Diag(FD->getTypeSpecStartLoc(), diag::err_kern_type_not_void_return) 2851 << FD->getType(); 2852 } 2853 return; 2854 } 2855 2856 D->addAttr(::new (S.Context) CUDAGlobalAttr(Attr.getRange(), S.Context)); 2857 } else { 2858 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "global"; 2859 } 2860 } 2861 2862 static void handleHostAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2863 if (S.LangOpts.CUDA) { 2864 // check the attribute arguments. 2865 if (!checkAttributeNumArgs(S, Attr, 0)) 2866 return; 2867 2868 2869 if (!isa<FunctionDecl>(D)) { 2870 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2871 << Attr.getName() << ExpectedFunction; 2872 return; 2873 } 2874 2875 D->addAttr(::new (S.Context) CUDAHostAttr(Attr.getRange(), S.Context)); 2876 } else { 2877 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "host"; 2878 } 2879 } 2880 2881 static void handleSharedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2882 if (S.LangOpts.CUDA) { 2883 // check the attribute arguments. 2884 if (!checkAttributeNumArgs(S, Attr, 0)) 2885 return; 2886 2887 2888 if (!isa<VarDecl>(D)) { 2889 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2890 << Attr.getName() << ExpectedVariable; 2891 return; 2892 } 2893 2894 D->addAttr(::new (S.Context) CUDASharedAttr(Attr.getRange(), S.Context)); 2895 } else { 2896 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "shared"; 2897 } 2898 } 2899 2900 static void handleGNUInlineAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2901 // check the attribute arguments. 2902 if (!checkAttributeNumArgs(S, Attr, 0)) 2903 return; 2904 2905 FunctionDecl *Fn = dyn_cast<FunctionDecl>(D); 2906 if (Fn == 0) { 2907 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2908 << Attr.getName() << ExpectedFunction; 2909 return; 2910 } 2911 2912 if (!Fn->isInlineSpecified()) { 2913 S.Diag(Attr.getLoc(), diag::warn_gnu_inline_attribute_requires_inline); 2914 return; 2915 } 2916 2917 D->addAttr(::new (S.Context) GNUInlineAttr(Attr.getRange(), S.Context)); 2918 } 2919 2920 static void handleCallConvAttr(Sema &S, Decl *D, const AttributeList &Attr) { 2921 if (hasDeclarator(D)) return; 2922 2923 // Diagnostic is emitted elsewhere: here we store the (valid) Attr 2924 // in the Decl node for syntactic reasoning, e.g., pretty-printing. 2925 CallingConv CC; 2926 if (S.CheckCallingConvAttr(Attr, CC)) 2927 return; 2928 2929 if (!isa<ObjCMethodDecl>(D)) { 2930 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 2931 << Attr.getName() << ExpectedFunctionOrMethod; 2932 return; 2933 } 2934 2935 switch (Attr.getKind()) { 2936 case AttributeList::AT_fastcall: 2937 D->addAttr(::new (S.Context) FastCallAttr(Attr.getRange(), S.Context)); 2938 return; 2939 case AttributeList::AT_stdcall: 2940 D->addAttr(::new (S.Context) StdCallAttr(Attr.getRange(), S.Context)); 2941 return; 2942 case AttributeList::AT_thiscall: 2943 D->addAttr(::new (S.Context) ThisCallAttr(Attr.getRange(), S.Context)); 2944 return; 2945 case AttributeList::AT_cdecl: 2946 D->addAttr(::new (S.Context) CDeclAttr(Attr.getRange(), S.Context)); 2947 return; 2948 case AttributeList::AT_pascal: 2949 D->addAttr(::new (S.Context) PascalAttr(Attr.getRange(), S.Context)); 2950 return; 2951 case AttributeList::AT_pcs: { 2952 Expr *Arg = Attr.getArg(0); 2953 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2954 if (!Str || !Str->isAscii()) { 2955 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 2956 << "pcs" << 1; 2957 Attr.setInvalid(); 2958 return; 2959 } 2960 2961 StringRef StrRef = Str->getString(); 2962 PcsAttr::PCSType PCS; 2963 if (StrRef == "aapcs") 2964 PCS = PcsAttr::AAPCS; 2965 else if (StrRef == "aapcs-vfp") 2966 PCS = PcsAttr::AAPCS_VFP; 2967 else { 2968 S.Diag(Attr.getLoc(), diag::err_invalid_pcs); 2969 Attr.setInvalid(); 2970 return; 2971 } 2972 2973 D->addAttr(::new (S.Context) PcsAttr(Attr.getRange(), S.Context, PCS)); 2974 } 2975 default: 2976 llvm_unreachable("unexpected attribute kind"); 2977 return; 2978 } 2979 } 2980 2981 static void handleOpenCLKernelAttr(Sema &S, Decl *D, const AttributeList &Attr){ 2982 assert(!Attr.isInvalid()); 2983 D->addAttr(::new (S.Context) OpenCLKernelAttr(Attr.getRange(), S.Context)); 2984 } 2985 2986 bool Sema::CheckCallingConvAttr(const AttributeList &attr, CallingConv &CC) { 2987 if (attr.isInvalid()) 2988 return true; 2989 2990 if ((attr.getNumArgs() != 0 && 2991 !(attr.getKind() == AttributeList::AT_pcs && attr.getNumArgs() == 1)) || 2992 attr.getParameterName()) { 2993 Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 2994 attr.setInvalid(); 2995 return true; 2996 } 2997 2998 // TODO: diagnose uses of these conventions on the wrong target. Or, better 2999 // move to TargetAttributesSema one day. 3000 switch (attr.getKind()) { 3001 case AttributeList::AT_cdecl: CC = CC_C; break; 3002 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 3003 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 3004 case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break; 3005 case AttributeList::AT_pascal: CC = CC_X86Pascal; break; 3006 case AttributeList::AT_pcs: { 3007 Expr *Arg = attr.getArg(0); 3008 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 3009 if (!Str || !Str->isAscii()) { 3010 Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3011 << "pcs" << 1; 3012 attr.setInvalid(); 3013 return true; 3014 } 3015 3016 StringRef StrRef = Str->getString(); 3017 if (StrRef == "aapcs") { 3018 CC = CC_AAPCS; 3019 break; 3020 } else if (StrRef == "aapcs-vfp") { 3021 CC = CC_AAPCS_VFP; 3022 break; 3023 } 3024 // FALLS THROUGH 3025 } 3026 default: llvm_unreachable("unexpected attribute kind"); return true; 3027 } 3028 3029 return false; 3030 } 3031 3032 static void handleRegparmAttr(Sema &S, Decl *D, const AttributeList &Attr) { 3033 if (hasDeclarator(D)) return; 3034 3035 unsigned numParams; 3036 if (S.CheckRegparmAttr(Attr, numParams)) 3037 return; 3038 3039 if (!isa<ObjCMethodDecl>(D)) { 3040 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 3041 << Attr.getName() << ExpectedFunctionOrMethod; 3042 return; 3043 } 3044 3045 D->addAttr(::new (S.Context) RegparmAttr(Attr.getRange(), S.Context, numParams)); 3046 } 3047 3048 /// Checks a regparm attribute, returning true if it is ill-formed and 3049 /// otherwise setting numParams to the appropriate value. 3050 bool Sema::CheckRegparmAttr(const AttributeList &Attr, unsigned &numParams) { 3051 if (Attr.isInvalid()) 3052 return true; 3053 3054 if (Attr.getNumArgs() != 1) { 3055 Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3056 Attr.setInvalid(); 3057 return true; 3058 } 3059 3060 Expr *NumParamsExpr = Attr.getArg(0); 3061 llvm::APSInt NumParams(32); 3062 if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || 3063 !NumParamsExpr->isIntegerConstantExpr(NumParams, Context)) { 3064 Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3065 << "regparm" << NumParamsExpr->getSourceRange(); 3066 Attr.setInvalid(); 3067 return true; 3068 } 3069 3070 if (Context.getTargetInfo().getRegParmMax() == 0) { 3071 Diag(Attr.getLoc(), diag::err_attribute_regparm_wrong_platform) 3072 << NumParamsExpr->getSourceRange(); 3073 Attr.setInvalid(); 3074 return true; 3075 } 3076 3077 numParams = NumParams.getZExtValue(); 3078 if (numParams > Context.getTargetInfo().getRegParmMax()) { 3079 Diag(Attr.getLoc(), diag::err_attribute_regparm_invalid_number) 3080 << Context.getTargetInfo().getRegParmMax() << NumParamsExpr->getSourceRange(); 3081 Attr.setInvalid(); 3082 return true; 3083 } 3084 3085 return false; 3086 } 3087 3088 static void handleLaunchBoundsAttr(Sema &S, Decl *D, const AttributeList &Attr){ 3089 if (S.LangOpts.CUDA) { 3090 // check the attribute arguments. 3091 if (Attr.getNumArgs() != 1 && Attr.getNumArgs() != 2) { 3092 // FIXME: 0 is not okay. 3093 S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments) << 2; 3094 return; 3095 } 3096 3097 if (!isFunctionOrMethod(D)) { 3098 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 3099 << Attr.getName() << ExpectedFunctionOrMethod; 3100 return; 3101 } 3102 3103 Expr *MaxThreadsExpr = Attr.getArg(0); 3104 llvm::APSInt MaxThreads(32); 3105 if (MaxThreadsExpr->isTypeDependent() || 3106 MaxThreadsExpr->isValueDependent() || 3107 !MaxThreadsExpr->isIntegerConstantExpr(MaxThreads, S.Context)) { 3108 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 3109 << "launch_bounds" << 1 << MaxThreadsExpr->getSourceRange(); 3110 return; 3111 } 3112 3113 llvm::APSInt MinBlocks(32); 3114 if (Attr.getNumArgs() > 1) { 3115 Expr *MinBlocksExpr = Attr.getArg(1); 3116 if (MinBlocksExpr->isTypeDependent() || 3117 MinBlocksExpr->isValueDependent() || 3118 !MinBlocksExpr->isIntegerConstantExpr(MinBlocks, S.Context)) { 3119 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 3120 << "launch_bounds" << 2 << MinBlocksExpr->getSourceRange(); 3121 return; 3122 } 3123 } 3124 3125 D->addAttr(::new (S.Context) CUDALaunchBoundsAttr(Attr.getRange(), S.Context, 3126 MaxThreads.getZExtValue(), 3127 MinBlocks.getZExtValue())); 3128 } else { 3129 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "launch_bounds"; 3130 } 3131 } 3132 3133 //===----------------------------------------------------------------------===// 3134 // Checker-specific attribute handlers. 3135 //===----------------------------------------------------------------------===// 3136 3137 static bool isValidSubjectOfNSAttribute(Sema &S, QualType type) { 3138 return type->isDependentType() || 3139 type->isObjCObjectPointerType() || 3140 S.Context.isObjCNSObjectType(type); 3141 } 3142 static bool isValidSubjectOfCFAttribute(Sema &S, QualType type) { 3143 return type->isDependentType() || 3144 type->isPointerType() || 3145 isValidSubjectOfNSAttribute(S, type); 3146 } 3147 3148 static void handleNSConsumedAttr(Sema &S, Decl *D, const AttributeList &Attr) { 3149 ParmVarDecl *param = dyn_cast<ParmVarDecl>(D); 3150 if (!param) { 3151 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) 3152 << Attr.getRange() << Attr.getName() << ExpectedParameter; 3153 return; 3154 } 3155 3156 bool typeOK, cf; 3157 if (Attr.getKind() == AttributeList::AT_ns_consumed) { 3158 typeOK = isValidSubjectOfNSAttribute(S, param->getType()); 3159 cf = false; 3160 } else { 3161 typeOK = isValidSubjectOfCFAttribute(S, param->getType()); 3162 cf = true; 3163 } 3164 3165 if (!typeOK) { 3166 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_parameter_type) 3167 << Attr.getRange() << Attr.getName() << cf; 3168 return; 3169 } 3170 3171 if (cf) 3172 param->addAttr(::new (S.Context) CFConsumedAttr(Attr.getRange(), S.Context)); 3173 else 3174 param->addAttr(::new (S.Context) NSConsumedAttr(Attr.getRange(), S.Context)); 3175 } 3176 3177 static void handleNSConsumesSelfAttr(Sema &S, Decl *D, 3178 const AttributeList &Attr) { 3179 if (!isa<ObjCMethodDecl>(D)) { 3180 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) 3181 << Attr.getRange() << Attr.getName() << ExpectedMethod; 3182 return; 3183 } 3184 3185 D->addAttr(::new (S.Context) NSConsumesSelfAttr(Attr.getRange(), S.Context)); 3186 } 3187 3188 static void handleNSReturnsRetainedAttr(Sema &S, Decl *D, 3189 const AttributeList &Attr) { 3190 3191 QualType returnType; 3192 3193 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) 3194 returnType = MD->getResultType(); 3195 else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(D)) 3196 returnType = PD->getType(); 3197 else if (S.getLangOptions().ObjCAutoRefCount && hasDeclarator(D) && 3198 (Attr.getKind() == AttributeList::AT_ns_returns_retained)) 3199 return; // ignore: was handled as a type attribute 3200 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) 3201 returnType = FD->getResultType(); 3202 else { 3203 S.Diag(D->getLocStart(), diag::warn_attribute_wrong_decl_type) 3204 << Attr.getRange() << Attr.getName() 3205 << ExpectedFunctionOrMethod; 3206 return; 3207 } 3208 3209 bool typeOK; 3210 bool cf; 3211 switch (Attr.getKind()) { 3212 default: llvm_unreachable("invalid ownership attribute"); return; 3213 case AttributeList::AT_ns_returns_autoreleased: 3214 case AttributeList::AT_ns_returns_retained: 3215 case AttributeList::AT_ns_returns_not_retained: 3216 typeOK = isValidSubjectOfNSAttribute(S, returnType); 3217 cf = false; 3218 break; 3219 3220 case AttributeList::AT_cf_returns_retained: 3221 case AttributeList::AT_cf_returns_not_retained: 3222 typeOK = isValidSubjectOfCFAttribute(S, returnType); 3223 cf = true; 3224 break; 3225 } 3226 3227 if (!typeOK) { 3228 S.Diag(D->getLocStart(), diag::warn_ns_attribute_wrong_return_type) 3229 << Attr.getRange() << Attr.getName() << isa<ObjCMethodDecl>(D) << cf; 3230 return; 3231 } 3232 3233 switch (Attr.getKind()) { 3234 default: 3235 llvm_unreachable("invalid ownership attribute"); 3236 case AttributeList::AT_ns_returns_autoreleased: 3237 D->addAttr(::new (S.Context) NSReturnsAutoreleasedAttr(Attr.getRange(), 3238 S.Context)); 3239 return; 3240 case AttributeList::AT_cf_returns_not_retained: 3241 D->addAttr(::new (S.Context) CFReturnsNotRetainedAttr(Attr.getRange(), 3242 S.Context)); 3243 return; 3244 case AttributeList::AT_ns_returns_not_retained: 3245 D->addAttr(::new (S.Context) NSReturnsNotRetainedAttr(Attr.getRange(), 3246 S.Context)); 3247 return; 3248 case AttributeList::AT_cf_returns_retained: 3249 D->addAttr(::new (S.Context) CFReturnsRetainedAttr(Attr.getRange(), 3250 S.Context)); 3251 return; 3252 case AttributeList::AT_ns_returns_retained: 3253 D->addAttr(::new (S.Context) NSReturnsRetainedAttr(Attr.getRange(), 3254 S.Context)); 3255 return; 3256 }; 3257 } 3258 3259 static void handleObjCReturnsInnerPointerAttr(Sema &S, Decl *D, 3260 const AttributeList &attr) { 3261 SourceLocation loc = attr.getLoc(); 3262 3263 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(D); 3264 3265 if (!isa<ObjCMethodDecl>(method)) { 3266 S.Diag(method->getLocStart(), diag::err_attribute_wrong_decl_type) 3267 << SourceRange(loc, loc) << attr.getName() << 13 /* methods */; 3268 return; 3269 } 3270 3271 // Check that the method returns a normal pointer. 3272 QualType resultType = method->getResultType(); 3273 3274 if (!resultType->isReferenceType() && 3275 (!resultType->isPointerType() || resultType->isObjCRetainableType())) { 3276 S.Diag(method->getLocStart(), diag::warn_ns_attribute_wrong_return_type) 3277 << SourceRange(loc) 3278 << attr.getName() << /*method*/ 1 << /*non-retainable pointer*/ 2; 3279 3280 // Drop the attribute. 3281 return; 3282 } 3283 3284 method->addAttr( 3285 ::new (S.Context) ObjCReturnsInnerPointerAttr(attr.getRange(), S.Context)); 3286 } 3287 3288 /// Handle cf_audited_transfer and cf_unknown_transfer. 3289 static void handleCFTransferAttr(Sema &S, Decl *D, const AttributeList &A) { 3290 if (!isa<FunctionDecl>(D)) { 3291 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) 3292 << A.getRange() << A.getName() << 0 /*function*/; 3293 return; 3294 } 3295 3296 bool IsAudited = (A.getKind() == AttributeList::AT_cf_audited_transfer); 3297 3298 // Check whether there's a conflicting attribute already present. 3299 Attr *Existing; 3300 if (IsAudited) { 3301 Existing = D->getAttr<CFUnknownTransferAttr>(); 3302 } else { 3303 Existing = D->getAttr<CFAuditedTransferAttr>(); 3304 } 3305 if (Existing) { 3306 S.Diag(D->getLocStart(), diag::err_attributes_are_not_compatible) 3307 << A.getName() 3308 << (IsAudited ? "cf_unknown_transfer" : "cf_audited_transfer") 3309 << A.getRange() << Existing->getRange(); 3310 return; 3311 } 3312 3313 // All clear; add the attribute. 3314 if (IsAudited) { 3315 D->addAttr( 3316 ::new (S.Context) CFAuditedTransferAttr(A.getRange(), S.Context)); 3317 } else { 3318 D->addAttr( 3319 ::new (S.Context) CFUnknownTransferAttr(A.getRange(), S.Context)); 3320 } 3321 } 3322 3323 static void handleNSBridgedAttr(Sema &S, Scope *Sc, Decl *D, 3324 const AttributeList &Attr) { 3325 RecordDecl *RD = dyn_cast<RecordDecl>(D); 3326 if (!RD || RD->isUnion()) { 3327 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) 3328 << Attr.getRange() << Attr.getName() << 14 /*struct */; 3329 } 3330 3331 IdentifierInfo *ParmName = Attr.getParameterName(); 3332 3333 // In Objective-C, verify that the type names an Objective-C type. 3334 // We don't want to check this outside of ObjC because people sometimes 3335 // do crazy C declarations of Objective-C types. 3336 if (ParmName && S.getLangOptions().ObjC1) { 3337 // Check for an existing type with this name. 3338 LookupResult R(S, DeclarationName(ParmName), Attr.getParameterLoc(), 3339 Sema::LookupOrdinaryName); 3340 if (S.LookupName(R, Sc)) { 3341 NamedDecl *Target = R.getFoundDecl(); 3342 if (Target && !isa<ObjCInterfaceDecl>(Target)) { 3343 S.Diag(D->getLocStart(), diag::err_ns_bridged_not_interface); 3344 S.Diag(Target->getLocStart(), diag::note_declared_at); 3345 } 3346 } 3347 } 3348 3349 D->addAttr(::new (S.Context) NSBridgedAttr(Attr.getRange(), S.Context, 3350 ParmName)); 3351 } 3352 3353 static void handleObjCOwnershipAttr(Sema &S, Decl *D, 3354 const AttributeList &Attr) { 3355 if (hasDeclarator(D)) return; 3356 3357 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) 3358 << Attr.getRange() << Attr.getName() << 12 /* variable */; 3359 } 3360 3361 static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D, 3362 const AttributeList &Attr) { 3363 if (!isa<VarDecl>(D) && !isa<FieldDecl>(D)) { 3364 S.Diag(D->getLocStart(), diag::err_attribute_wrong_decl_type) 3365 << Attr.getRange() << Attr.getName() << 12 /* variable */; 3366 return; 3367 } 3368 3369 ValueDecl *vd = cast<ValueDecl>(D); 3370 QualType type = vd->getType(); 3371 3372 if (!type->isDependentType() && 3373 !type->isObjCLifetimeType()) { 3374 S.Diag(Attr.getLoc(), diag::err_objc_precise_lifetime_bad_type) 3375 << type; 3376 return; 3377 } 3378 3379 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3380 3381 // If we have no lifetime yet, check the lifetime we're presumably 3382 // going to infer. 3383 if (lifetime == Qualifiers::OCL_None && !type->isDependentType()) 3384 lifetime = type->getObjCARCImplicitLifetime(); 3385 3386 switch (lifetime) { 3387 case Qualifiers::OCL_None: 3388 assert(type->isDependentType() && 3389 "didn't infer lifetime for non-dependent type?"); 3390 break; 3391 3392 case Qualifiers::OCL_Weak: // meaningful 3393 case Qualifiers::OCL_Strong: // meaningful 3394 break; 3395 3396 case Qualifiers::OCL_ExplicitNone: 3397 case Qualifiers::OCL_Autoreleasing: 3398 S.Diag(Attr.getLoc(), diag::warn_objc_precise_lifetime_meaningless) 3399 << (lifetime == Qualifiers::OCL_Autoreleasing); 3400 break; 3401 } 3402 3403 D->addAttr(::new (S.Context) 3404 ObjCPreciseLifetimeAttr(Attr.getRange(), S.Context)); 3405 } 3406 3407 static bool isKnownDeclSpecAttr(const AttributeList &Attr) { 3408 return Attr.getKind() == AttributeList::AT_dllimport || 3409 Attr.getKind() == AttributeList::AT_dllexport || 3410 Attr.getKind() == AttributeList::AT_uuid; 3411 } 3412 3413 //===----------------------------------------------------------------------===// 3414 // Microsoft specific attribute handlers. 3415 //===----------------------------------------------------------------------===// 3416 3417 static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) { 3418 if (S.LangOpts.MicrosoftExt || S.LangOpts.Borland) { 3419 // check the attribute arguments. 3420 if (!checkAttributeNumArgs(S, Attr, 1)) 3421 return; 3422 3423 Expr *Arg = Attr.getArg(0); 3424 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 3425 if (!Str || !Str->isAscii()) { 3426 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 3427 << "uuid" << 1; 3428 return; 3429 } 3430 3431 StringRef StrRef = Str->getString(); 3432 3433 bool IsCurly = StrRef.size() > 1 && StrRef.front() == '{' && 3434 StrRef.back() == '}'; 3435 3436 // Validate GUID length. 3437 if (IsCurly && StrRef.size() != 38) { 3438 S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid); 3439 return; 3440 } 3441 if (!IsCurly && StrRef.size() != 36) { 3442 S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid); 3443 return; 3444 } 3445 3446 // GUID format is "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" or 3447 // "{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}" 3448 StringRef::iterator I = StrRef.begin(); 3449 if (IsCurly) // Skip the optional '{' 3450 ++I; 3451 3452 for (int i = 0; i < 36; ++i) { 3453 if (i == 8 || i == 13 || i == 18 || i == 23) { 3454 if (*I != '-') { 3455 S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid); 3456 return; 3457 } 3458 } else if (!isxdigit(*I)) { 3459 S.Diag(Attr.getLoc(), diag::err_attribute_uuid_malformed_guid); 3460 return; 3461 } 3462 I++; 3463 } 3464 3465 D->addAttr(::new (S.Context) UuidAttr(Attr.getRange(), S.Context, 3466 Str->getString())); 3467 } else 3468 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "uuid"; 3469 } 3470 3471 //===----------------------------------------------------------------------===// 3472 // Top Level Sema Entry Points 3473 //===----------------------------------------------------------------------===// 3474 3475 static void ProcessNonInheritableDeclAttr(Sema &S, Scope *scope, Decl *D, 3476 const AttributeList &Attr) { 3477 switch (Attr.getKind()) { 3478 case AttributeList::AT_device: handleDeviceAttr (S, D, Attr); break; 3479 case AttributeList::AT_host: handleHostAttr (S, D, Attr); break; 3480 case AttributeList::AT_overloadable:handleOverloadableAttr(S, D, Attr); break; 3481 default: 3482 break; 3483 } 3484 } 3485 3486 static void ProcessInheritableDeclAttr(Sema &S, Scope *scope, Decl *D, 3487 const AttributeList &Attr) { 3488 switch (Attr.getKind()) { 3489 case AttributeList::AT_IBAction: handleIBAction(S, D, Attr); break; 3490 case AttributeList::AT_IBOutlet: handleIBOutlet(S, D, Attr); break; 3491 case AttributeList::AT_IBOutletCollection: 3492 handleIBOutletCollection(S, D, Attr); break; 3493 case AttributeList::AT_address_space: 3494 case AttributeList::AT_opencl_image_access: 3495 case AttributeList::AT_objc_gc: 3496 case AttributeList::AT_vector_size: 3497 case AttributeList::AT_neon_vector_type: 3498 case AttributeList::AT_neon_polyvector_type: 3499 // Ignore these, these are type attributes, handled by 3500 // ProcessTypeAttributes. 3501 break; 3502 case AttributeList::AT_device: 3503 case AttributeList::AT_host: 3504 case AttributeList::AT_overloadable: 3505 // Ignore, this is a non-inheritable attribute, handled 3506 // by ProcessNonInheritableDeclAttr. 3507 break; 3508 case AttributeList::AT_alias: handleAliasAttr (S, D, Attr); break; 3509 case AttributeList::AT_aligned: handleAlignedAttr (S, D, Attr); break; 3510 case AttributeList::AT_always_inline: 3511 handleAlwaysInlineAttr (S, D, Attr); break; 3512 case AttributeList::AT_analyzer_noreturn: 3513 handleAnalyzerNoReturnAttr (S, D, Attr); break; 3514 case AttributeList::AT_annotate: handleAnnotateAttr (S, D, Attr); break; 3515 case AttributeList::AT_availability:handleAvailabilityAttr(S, D, Attr); break; 3516 case AttributeList::AT_carries_dependency: 3517 handleDependencyAttr (S, D, Attr); break; 3518 case AttributeList::AT_common: handleCommonAttr (S, D, Attr); break; 3519 case AttributeList::AT_constant: handleConstantAttr (S, D, Attr); break; 3520 case AttributeList::AT_constructor: handleConstructorAttr (S, D, Attr); break; 3521 case AttributeList::AT_deprecated: handleDeprecatedAttr (S, D, Attr); break; 3522 case AttributeList::AT_destructor: handleDestructorAttr (S, D, Attr); break; 3523 case AttributeList::AT_ext_vector_type: 3524 handleExtVectorTypeAttr(S, scope, D, Attr); 3525 break; 3526 case AttributeList::AT_format: handleFormatAttr (S, D, Attr); break; 3527 case AttributeList::AT_format_arg: handleFormatArgAttr (S, D, Attr); break; 3528 case AttributeList::AT_global: handleGlobalAttr (S, D, Attr); break; 3529 case AttributeList::AT_gnu_inline: handleGNUInlineAttr (S, D, Attr); break; 3530 case AttributeList::AT_launch_bounds: 3531 handleLaunchBoundsAttr(S, D, Attr); 3532 break; 3533 case AttributeList::AT_mode: handleModeAttr (S, D, Attr); break; 3534 case AttributeList::AT_malloc: handleMallocAttr (S, D, Attr); break; 3535 case AttributeList::AT_may_alias: handleMayAliasAttr (S, D, Attr); break; 3536 case AttributeList::AT_nocommon: handleNoCommonAttr (S, D, Attr); break; 3537 case AttributeList::AT_nonnull: handleNonNullAttr (S, D, Attr); break; 3538 case AttributeList::AT_ownership_returns: 3539 case AttributeList::AT_ownership_takes: 3540 case AttributeList::AT_ownership_holds: 3541 handleOwnershipAttr (S, D, Attr); break; 3542 case AttributeList::AT_naked: handleNakedAttr (S, D, Attr); break; 3543 case AttributeList::AT_noreturn: handleNoReturnAttr (S, D, Attr); break; 3544 case AttributeList::AT_nothrow: handleNothrowAttr (S, D, Attr); break; 3545 case AttributeList::AT_shared: handleSharedAttr (S, D, Attr); break; 3546 case AttributeList::AT_vecreturn: handleVecReturnAttr (S, D, Attr); break; 3547 3548 case AttributeList::AT_objc_ownership: 3549 handleObjCOwnershipAttr(S, D, Attr); break; 3550 case AttributeList::AT_objc_precise_lifetime: 3551 handleObjCPreciseLifetimeAttr(S, D, Attr); break; 3552 3553 case AttributeList::AT_objc_returns_inner_pointer: 3554 handleObjCReturnsInnerPointerAttr(S, D, Attr); break; 3555 3556 case AttributeList::AT_ns_bridged: 3557 handleNSBridgedAttr(S, scope, D, Attr); break; 3558 3559 case AttributeList::AT_cf_audited_transfer: 3560 case AttributeList::AT_cf_unknown_transfer: 3561 handleCFTransferAttr(S, D, Attr); break; 3562 3563 // Checker-specific. 3564 case AttributeList::AT_cf_consumed: 3565 case AttributeList::AT_ns_consumed: handleNSConsumedAttr (S, D, Attr); break; 3566 case AttributeList::AT_ns_consumes_self: 3567 handleNSConsumesSelfAttr(S, D, Attr); break; 3568 3569 case AttributeList::AT_ns_returns_autoreleased: 3570 case AttributeList::AT_ns_returns_not_retained: 3571 case AttributeList::AT_cf_returns_not_retained: 3572 case AttributeList::AT_ns_returns_retained: 3573 case AttributeList::AT_cf_returns_retained: 3574 handleNSReturnsRetainedAttr(S, D, Attr); break; 3575 3576 case AttributeList::AT_reqd_wg_size: 3577 handleReqdWorkGroupSize(S, D, Attr); break; 3578 3579 case AttributeList::AT_init_priority: 3580 handleInitPriorityAttr(S, D, Attr); break; 3581 3582 case AttributeList::AT_packed: handlePackedAttr (S, D, Attr); break; 3583 case AttributeList::AT_MsStruct: handleMsStructAttr (S, D, Attr); break; 3584 case AttributeList::AT_section: handleSectionAttr (S, D, Attr); break; 3585 case AttributeList::AT_unavailable: handleUnavailableAttr (S, D, Attr); break; 3586 case AttributeList::AT_arc_weakref_unavailable: 3587 handleArcWeakrefUnavailableAttr (S, D, Attr); 3588 break; 3589 case AttributeList::AT_unused: handleUnusedAttr (S, D, Attr); break; 3590 case AttributeList::AT_returns_twice: 3591 handleReturnsTwiceAttr(S, D, Attr); 3592 break; 3593 case AttributeList::AT_used: handleUsedAttr (S, D, Attr); break; 3594 case AttributeList::AT_visibility: handleVisibilityAttr (S, D, Attr); break; 3595 case AttributeList::AT_warn_unused_result: handleWarnUnusedResult(S, D, Attr); 3596 break; 3597 case AttributeList::AT_weak: handleWeakAttr (S, D, Attr); break; 3598 case AttributeList::AT_weakref: handleWeakRefAttr (S, D, Attr); break; 3599 case AttributeList::AT_weak_import: handleWeakImportAttr (S, D, Attr); break; 3600 case AttributeList::AT_transparent_union: 3601 handleTransparentUnionAttr(S, D, Attr); 3602 break; 3603 case AttributeList::AT_objc_exception: 3604 handleObjCExceptionAttr(S, D, Attr); 3605 break; 3606 case AttributeList::AT_objc_method_family: 3607 handleObjCMethodFamilyAttr(S, D, Attr); 3608 break; 3609 case AttributeList::AT_nsobject: handleObjCNSObject (S, D, Attr); break; 3610 case AttributeList::AT_blocks: handleBlocksAttr (S, D, Attr); break; 3611 case AttributeList::AT_sentinel: handleSentinelAttr (S, D, Attr); break; 3612 case AttributeList::AT_const: handleConstAttr (S, D, Attr); break; 3613 case AttributeList::AT_pure: handlePureAttr (S, D, Attr); break; 3614 case AttributeList::AT_cleanup: handleCleanupAttr (S, D, Attr); break; 3615 case AttributeList::AT_nodebug: handleNoDebugAttr (S, D, Attr); break; 3616 case AttributeList::AT_noinline: handleNoInlineAttr (S, D, Attr); break; 3617 case AttributeList::AT_regparm: handleRegparmAttr (S, D, Attr); break; 3618 case AttributeList::IgnoredAttribute: 3619 // Just ignore 3620 break; 3621 case AttributeList::AT_no_instrument_function: // Interacts with -pg. 3622 handleNoInstrumentFunctionAttr(S, D, Attr); 3623 break; 3624 case AttributeList::AT_stdcall: 3625 case AttributeList::AT_cdecl: 3626 case AttributeList::AT_fastcall: 3627 case AttributeList::AT_thiscall: 3628 case AttributeList::AT_pascal: 3629 case AttributeList::AT_pcs: 3630 handleCallConvAttr(S, D, Attr); 3631 break; 3632 case AttributeList::AT_opencl_kernel_function: 3633 handleOpenCLKernelAttr(S, D, Attr); 3634 break; 3635 case AttributeList::AT_uuid: 3636 handleUuidAttr(S, D, Attr); 3637 break; 3638 3639 // Thread safety attributes: 3640 case AttributeList::AT_guarded_var: 3641 handleGuardedVarAttr(S, D, Attr); 3642 break; 3643 case AttributeList::AT_pt_guarded_var: 3644 handleGuardedVarAttr(S, D, Attr, /*pointer = */true); 3645 break; 3646 case AttributeList::AT_scoped_lockable: 3647 handleLockableAttr(S, D, Attr, /*scoped = */true); 3648 break; 3649 case AttributeList::AT_no_thread_safety_analysis: 3650 handleNoThreadSafetyAttr(S, D, Attr); 3651 break; 3652 case AttributeList::AT_lockable: 3653 handleLockableAttr(S, D, Attr); 3654 break; 3655 case AttributeList::AT_guarded_by: 3656 handleGuardedByAttr(S, D, Attr); 3657 break; 3658 case AttributeList::AT_pt_guarded_by: 3659 handleGuardedByAttr(S, D, Attr, /*pointer = */true); 3660 break; 3661 case AttributeList::AT_exclusive_lock_function: 3662 handleLockFunAttr(S, D, Attr, /*exclusive = */true); 3663 break; 3664 case AttributeList::AT_exclusive_locks_required: 3665 handleLocksRequiredAttr(S, D, Attr, /*exclusive = */true); 3666 break; 3667 case AttributeList::AT_exclusive_trylock_function: 3668 handleTrylockFunAttr(S, D, Attr, /*exclusive = */true); 3669 break; 3670 case AttributeList::AT_lock_returned: 3671 handleLockReturnedAttr(S, D, Attr); 3672 break; 3673 case AttributeList::AT_locks_excluded: 3674 handleLocksExcludedAttr(S, D, Attr); 3675 break; 3676 case AttributeList::AT_shared_lock_function: 3677 handleLockFunAttr(S, D, Attr); 3678 break; 3679 case AttributeList::AT_shared_locks_required: 3680 handleLocksRequiredAttr(S, D, Attr); 3681 break; 3682 case AttributeList::AT_shared_trylock_function: 3683 handleTrylockFunAttr(S, D, Attr); 3684 break; 3685 case AttributeList::AT_unlock_function: 3686 handleUnlockFunAttr(S, D, Attr); 3687 break; 3688 case AttributeList::AT_acquired_before: 3689 handleAcquireOrderAttr(S, D, Attr, /*before = */true); 3690 break; 3691 case AttributeList::AT_acquired_after: 3692 handleAcquireOrderAttr(S, D, Attr, /*before = */false); 3693 break; 3694 3695 default: 3696 // Ask target about the attribute. 3697 const TargetAttributesSema &TargetAttrs = S.getTargetAttributesSema(); 3698 if (!TargetAttrs.ProcessDeclAttribute(scope, D, Attr, S)) 3699 S.Diag(Attr.getLoc(), diag::warn_unknown_attribute_ignored) 3700 << Attr.getName(); 3701 break; 3702 } 3703 } 3704 3705 /// ProcessDeclAttribute - Apply the specific attribute to the specified decl if 3706 /// the attribute applies to decls. If the attribute is a type attribute, just 3707 /// silently ignore it if a GNU attribute. FIXME: Applying a C++0x attribute to 3708 /// the wrong thing is illegal (C++0x [dcl.attr.grammar]/4). 3709 static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D, 3710 const AttributeList &Attr, 3711 bool NonInheritable, bool Inheritable) { 3712 if (Attr.isInvalid()) 3713 return; 3714 3715 if (Attr.isDeclspecAttribute() && !isKnownDeclSpecAttr(Attr)) 3716 // FIXME: Try to deal with other __declspec attributes! 3717 return; 3718 3719 if (NonInheritable) 3720 ProcessNonInheritableDeclAttr(S, scope, D, Attr); 3721 3722 if (Inheritable) 3723 ProcessInheritableDeclAttr(S, scope, D, Attr); 3724 } 3725 3726 /// ProcessDeclAttributeList - Apply all the decl attributes in the specified 3727 /// attribute list to the specified decl, ignoring any type attributes. 3728 void Sema::ProcessDeclAttributeList(Scope *S, Decl *D, 3729 const AttributeList *AttrList, 3730 bool NonInheritable, bool Inheritable) { 3731 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 3732 ProcessDeclAttribute(*this, S, D, *l, NonInheritable, Inheritable); 3733 } 3734 3735 // GCC accepts 3736 // static int a9 __attribute__((weakref)); 3737 // but that looks really pointless. We reject it. 3738 if (Inheritable && D->hasAttr<WeakRefAttr>() && !D->hasAttr<AliasAttr>()) { 3739 Diag(AttrList->getLoc(), diag::err_attribute_weakref_without_alias) << 3740 dyn_cast<NamedDecl>(D)->getNameAsString(); 3741 return; 3742 } 3743 } 3744 3745 // Annotation attributes are the only attributes allowed after an access 3746 // specifier. 3747 bool Sema::ProcessAccessDeclAttributeList(AccessSpecDecl *ASDecl, 3748 const AttributeList *AttrList) { 3749 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 3750 if (l->getKind() == AttributeList::AT_annotate) { 3751 handleAnnotateAttr(*this, ASDecl, *l); 3752 } else { 3753 Diag(l->getLoc(), diag::err_only_annotate_after_access_spec); 3754 return true; 3755 } 3756 } 3757 3758 return false; 3759 } 3760 3761 /// checkUnusedDeclAttributes - Check a list of attributes to see if it 3762 /// contains any decl attributes that we should warn about. 3763 static void checkUnusedDeclAttributes(Sema &S, const AttributeList *A) { 3764 for ( ; A; A = A->getNext()) { 3765 // Only warn if the attribute is an unignored, non-type attribute. 3766 if (A->isUsedAsTypeAttr()) continue; 3767 if (A->getKind() == AttributeList::IgnoredAttribute) continue; 3768 3769 if (A->getKind() == AttributeList::UnknownAttribute) { 3770 S.Diag(A->getLoc(), diag::warn_unknown_attribute_ignored) 3771 << A->getName() << A->getRange(); 3772 } else { 3773 S.Diag(A->getLoc(), diag::warn_attribute_not_on_decl) 3774 << A->getName() << A->getRange(); 3775 } 3776 } 3777 } 3778 3779 /// checkUnusedDeclAttributes - Given a declarator which is not being 3780 /// used to build a declaration, complain about any decl attributes 3781 /// which might be lying around on it. 3782 void Sema::checkUnusedDeclAttributes(Declarator &D) { 3783 ::checkUnusedDeclAttributes(*this, D.getDeclSpec().getAttributes().getList()); 3784 ::checkUnusedDeclAttributes(*this, D.getAttributes()); 3785 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) 3786 ::checkUnusedDeclAttributes(*this, D.getTypeObject(i).getAttrs()); 3787 } 3788 3789 /// DeclClonePragmaWeak - clone existing decl (maybe definition), 3790 /// #pragma weak needs a non-definition decl and source may not have one 3791 NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II, 3792 SourceLocation Loc) { 3793 assert(isa<FunctionDecl>(ND) || isa<VarDecl>(ND)); 3794 NamedDecl *NewD = 0; 3795 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) { 3796 FunctionDecl *NewFD; 3797 // FIXME: Missing call to CheckFunctionDeclaration(). 3798 // FIXME: Mangling? 3799 // FIXME: Is the qualifier info correct? 3800 // FIXME: Is the DeclContext correct? 3801 NewFD = FunctionDecl::Create(FD->getASTContext(), FD->getDeclContext(), 3802 Loc, Loc, DeclarationName(II), 3803 FD->getType(), FD->getTypeSourceInfo(), 3804 SC_None, SC_None, 3805 false/*isInlineSpecified*/, 3806 FD->hasPrototype(), 3807 false/*isConstexprSpecified*/); 3808 NewD = NewFD; 3809 3810 if (FD->getQualifier()) 3811 NewFD->setQualifierInfo(FD->getQualifierLoc()); 3812 3813 // Fake up parameter variables; they are declared as if this were 3814 // a typedef. 3815 QualType FDTy = FD->getType(); 3816 if (const FunctionProtoType *FT = FDTy->getAs<FunctionProtoType>()) { 3817 SmallVector<ParmVarDecl*, 16> Params; 3818 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3819 AE = FT->arg_type_end(); AI != AE; ++AI) { 3820 ParmVarDecl *Param = BuildParmVarDeclForTypedef(NewFD, Loc, *AI); 3821 Param->setScopeInfo(0, Params.size()); 3822 Params.push_back(Param); 3823 } 3824 NewFD->setParams(Params); 3825 } 3826 } else if (VarDecl *VD = dyn_cast<VarDecl>(ND)) { 3827 NewD = VarDecl::Create(VD->getASTContext(), VD->getDeclContext(), 3828 VD->getInnerLocStart(), VD->getLocation(), II, 3829 VD->getType(), VD->getTypeSourceInfo(), 3830 VD->getStorageClass(), 3831 VD->getStorageClassAsWritten()); 3832 if (VD->getQualifier()) { 3833 VarDecl *NewVD = cast<VarDecl>(NewD); 3834 NewVD->setQualifierInfo(VD->getQualifierLoc()); 3835 } 3836 } 3837 return NewD; 3838 } 3839 3840 /// DeclApplyPragmaWeak - A declaration (maybe definition) needs #pragma weak 3841 /// applied to it, possibly with an alias. 3842 void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) { 3843 if (W.getUsed()) return; // only do this once 3844 W.setUsed(true); 3845 if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...)) 3846 IdentifierInfo *NDId = ND->getIdentifier(); 3847 NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation()); 3848 NewD->addAttr(::new (Context) AliasAttr(W.getLocation(), Context, 3849 NDId->getName())); 3850 NewD->addAttr(::new (Context) WeakAttr(W.getLocation(), Context)); 3851 WeakTopLevelDecl.push_back(NewD); 3852 // FIXME: "hideous" code from Sema::LazilyCreateBuiltin 3853 // to insert Decl at TU scope, sorry. 3854 DeclContext *SavedContext = CurContext; 3855 CurContext = Context.getTranslationUnitDecl(); 3856 PushOnScopeChains(NewD, S); 3857 CurContext = SavedContext; 3858 } else { // just add weak to existing 3859 ND->addAttr(::new (Context) WeakAttr(W.getLocation(), Context)); 3860 } 3861 } 3862 3863 /// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in 3864 /// it, apply them to D. This is a bit tricky because PD can have attributes 3865 /// specified in many different places, and we need to find and apply them all. 3866 void Sema::ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD, 3867 bool NonInheritable, bool Inheritable) { 3868 // It's valid to "forward-declare" #pragma weak, in which case we 3869 // have to do this. 3870 if (Inheritable) { 3871 LoadExternalWeakUndeclaredIdentifiers(); 3872 if (!WeakUndeclaredIdentifiers.empty()) { 3873 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) { 3874 if (IdentifierInfo *Id = ND->getIdentifier()) { 3875 llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator I 3876 = WeakUndeclaredIdentifiers.find(Id); 3877 if (I != WeakUndeclaredIdentifiers.end() && ND->hasLinkage()) { 3878 WeakInfo W = I->second; 3879 DeclApplyPragmaWeak(S, ND, W); 3880 WeakUndeclaredIdentifiers[Id] = W; 3881 } 3882 } 3883 } 3884 } 3885 } 3886 3887 // Apply decl attributes from the DeclSpec if present. 3888 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes().getList()) 3889 ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable); 3890 3891 // Walk the declarator structure, applying decl attributes that were in a type 3892 // position to the decl itself. This handles cases like: 3893 // int *__attr__(x)** D; 3894 // when X is a decl attribute. 3895 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i) 3896 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs()) 3897 ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable); 3898 3899 // Finally, apply any attributes on the decl itself. 3900 if (const AttributeList *Attrs = PD.getAttributes()) 3901 ProcessDeclAttributeList(S, D, Attrs, NonInheritable, Inheritable); 3902 } 3903 3904 /// Is the given declaration allowed to use a forbidden type? 3905 static bool isForbiddenTypeAllowed(Sema &S, Decl *decl) { 3906 // Private ivars are always okay. Unfortunately, people don't 3907 // always properly make their ivars private, even in system headers. 3908 // Plus we need to make fields okay, too. 3909 // Function declarations in sys headers will be marked unavailable. 3910 if (!isa<FieldDecl>(decl) && !isa<ObjCPropertyDecl>(decl) && 3911 !isa<FunctionDecl>(decl)) 3912 return false; 3913 3914 // Require it to be declared in a system header. 3915 return S.Context.getSourceManager().isInSystemHeader(decl->getLocation()); 3916 } 3917 3918 /// Handle a delayed forbidden-type diagnostic. 3919 static void handleDelayedForbiddenType(Sema &S, DelayedDiagnostic &diag, 3920 Decl *decl) { 3921 if (decl && isForbiddenTypeAllowed(S, decl)) { 3922 decl->addAttr(new (S.Context) UnavailableAttr(diag.Loc, S.Context, 3923 "this system declaration uses an unsupported type")); 3924 return; 3925 } 3926 if (S.getLangOptions().ObjCAutoRefCount) 3927 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(decl)) { 3928 // FIXME. we may want to supress diagnostics for all 3929 // kind of forbidden type messages on unavailable functions. 3930 if (FD->hasAttr<UnavailableAttr>() && 3931 diag.getForbiddenTypeDiagnostic() == 3932 diag::err_arc_array_param_no_ownership) { 3933 diag.Triggered = true; 3934 return; 3935 } 3936 } 3937 3938 S.Diag(diag.Loc, diag.getForbiddenTypeDiagnostic()) 3939 << diag.getForbiddenTypeOperand() << diag.getForbiddenTypeArgument(); 3940 diag.Triggered = true; 3941 } 3942 3943 // This duplicates a vector push_back but hides the need to know the 3944 // size of the type. 3945 void Sema::DelayedDiagnostics::add(const DelayedDiagnostic &diag) { 3946 assert(StackSize <= StackCapacity); 3947 3948 // Grow the stack if necessary. 3949 if (StackSize == StackCapacity) { 3950 unsigned newCapacity = 2 * StackCapacity + 2; 3951 char *newBuffer = new char[newCapacity * sizeof(DelayedDiagnostic)]; 3952 const char *oldBuffer = (const char*) Stack; 3953 3954 if (StackCapacity) 3955 memcpy(newBuffer, oldBuffer, StackCapacity * sizeof(DelayedDiagnostic)); 3956 3957 delete[] oldBuffer; 3958 Stack = reinterpret_cast<sema::DelayedDiagnostic*>(newBuffer); 3959 StackCapacity = newCapacity; 3960 } 3961 3962 assert(StackSize < StackCapacity); 3963 new (&Stack[StackSize++]) DelayedDiagnostic(diag); 3964 } 3965 3966 void Sema::DelayedDiagnostics::popParsingDecl(Sema &S, ParsingDeclState state, 3967 Decl *decl) { 3968 DelayedDiagnostics &DD = S.DelayedDiagnostics; 3969 3970 // Check the invariants. 3971 assert(DD.StackSize >= state.SavedStackSize); 3972 assert(state.SavedStackSize >= DD.ActiveStackBase); 3973 assert(DD.ParsingDepth > 0); 3974 3975 // Drop the parsing depth. 3976 DD.ParsingDepth--; 3977 3978 // If there are no active diagnostics, we're done. 3979 if (DD.StackSize == DD.ActiveStackBase) 3980 return; 3981 3982 // We only want to actually emit delayed diagnostics when we 3983 // successfully parsed a decl. 3984 if (decl && !decl->isInvalidDecl()) { 3985 // We emit all the active diagnostics, not just those starting 3986 // from the saved state. The idea is this: we get one push for a 3987 // decl spec and another for each declarator; in a decl group like: 3988 // deprecated_typedef foo, *bar, baz(); 3989 // only the declarator pops will be passed decls. This is correct; 3990 // we really do need to consider delayed diagnostics from the decl spec 3991 // for each of the different declarations. 3992 for (unsigned i = DD.ActiveStackBase, e = DD.StackSize; i != e; ++i) { 3993 DelayedDiagnostic &diag = DD.Stack[i]; 3994 if (diag.Triggered) 3995 continue; 3996 3997 switch (diag.Kind) { 3998 case DelayedDiagnostic::Deprecation: 3999 S.HandleDelayedDeprecationCheck(diag, decl); 4000 break; 4001 4002 case DelayedDiagnostic::Access: 4003 S.HandleDelayedAccessCheck(diag, decl); 4004 break; 4005 4006 case DelayedDiagnostic::ForbiddenType: 4007 handleDelayedForbiddenType(S, diag, decl); 4008 break; 4009 } 4010 } 4011 } 4012 4013 // Destroy all the delayed diagnostics we're about to pop off. 4014 for (unsigned i = state.SavedStackSize, e = DD.StackSize; i != e; ++i) 4015 DD.Stack[i].Destroy(); 4016 4017 DD.StackSize = state.SavedStackSize; 4018 } 4019 4020 static bool isDeclDeprecated(Decl *D) { 4021 do { 4022 if (D->isDeprecated()) 4023 return true; 4024 // A category implicitly has the availability of the interface. 4025 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 4026 return CatD->getClassInterface()->isDeprecated(); 4027 } while ((D = cast_or_null<Decl>(D->getDeclContext()))); 4028 return false; 4029 } 4030 4031 void Sema::HandleDelayedDeprecationCheck(DelayedDiagnostic &DD, 4032 Decl *Ctx) { 4033 if (isDeclDeprecated(Ctx)) 4034 return; 4035 4036 DD.Triggered = true; 4037 if (!DD.getDeprecationMessage().empty()) 4038 Diag(DD.Loc, diag::warn_deprecated_message) 4039 << DD.getDeprecationDecl()->getDeclName() 4040 << DD.getDeprecationMessage(); 4041 else 4042 Diag(DD.Loc, diag::warn_deprecated) 4043 << DD.getDeprecationDecl()->getDeclName(); 4044 } 4045 4046 void Sema::EmitDeprecationWarning(NamedDecl *D, StringRef Message, 4047 SourceLocation Loc, 4048 const ObjCInterfaceDecl *UnknownObjCClass) { 4049 // Delay if we're currently parsing a declaration. 4050 if (DelayedDiagnostics.shouldDelayDiagnostics()) { 4051 DelayedDiagnostics.add(DelayedDiagnostic::makeDeprecation(Loc, D, Message)); 4052 return; 4053 } 4054 4055 // Otherwise, don't warn if our current context is deprecated. 4056 if (isDeclDeprecated(cast<Decl>(getCurLexicalContext()))) 4057 return; 4058 if (!Message.empty()) 4059 Diag(Loc, diag::warn_deprecated_message) << D->getDeclName() 4060 << Message; 4061 else { 4062 if (!UnknownObjCClass) 4063 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 4064 else { 4065 Diag(Loc, diag::warn_deprecated_fwdclass_message) << D->getDeclName(); 4066 Diag(UnknownObjCClass->getLocation(), diag::note_forward_class); 4067 } 4068 } 4069 } 4070