SemaDeclAttr.cpp revision 6e67d9b883bea0ae19b94e7fd43719fde984782f
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 "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/Expr.h" 18#include "clang/Basic/Diagnostic.h" 19#include "clang/Basic/TargetInfo.h" 20#include "clang/Parse/DeclSpec.h" 21#include <llvm/ADT/StringExtras.h> 22using namespace clang; 23 24//===----------------------------------------------------------------------===// 25// Helper functions 26//===----------------------------------------------------------------------===// 27 28static const FunctionType *getFunctionType(Decl *d) { 29 QualType Ty; 30 if (ValueDecl *decl = dyn_cast<ValueDecl>(d)) 31 Ty = decl->getType(); 32 else if (FieldDecl *decl = dyn_cast<FieldDecl>(d)) 33 Ty = decl->getType(); 34 else if (TypedefDecl* decl = dyn_cast<TypedefDecl>(d)) 35 Ty = decl->getUnderlyingType(); 36 else 37 return 0; 38 39 if (Ty->isFunctionPointerType()) 40 Ty = Ty->getAsPointerType()->getPointeeType(); 41 42 return Ty->getAsFunctionType(); 43} 44 45// FIXME: We should provide an abstraction around a method or function 46// to provide the following bits of information. 47 48/// isFunctionOrMethod - Return true if the given decl has function 49/// type (function or function-typed variable) or an Objective-C 50/// method. 51static bool isFunctionOrMethod(Decl *d) { 52 return getFunctionType(d) || isa<ObjCMethodDecl>(d); 53} 54 55/// hasFunctionProto - Return true if the given decl has a argument 56/// information. This decl should have already passed 57/// isFunctionOrMethod. 58static bool hasFunctionProto(Decl *d) { 59 if (const FunctionType *FnTy = getFunctionType(d)) { 60 return isa<FunctionTypeProto>(FnTy); 61 } else { 62 assert(isa<ObjCMethodDecl>(d)); 63 return true; 64 } 65} 66 67/// getFunctionOrMethodNumArgs - Return number of function or method 68/// arguments. It is an error to call this on a K&R function (use 69/// hasFunctionProto first). 70static unsigned getFunctionOrMethodNumArgs(Decl *d) { 71 if (const FunctionType *FnTy = getFunctionType(d)) { 72 const FunctionTypeProto *proto = cast<FunctionTypeProto>(FnTy); 73 return proto->getNumArgs(); 74 } else { 75 return cast<ObjCMethodDecl>(d)->getNumParams(); 76 } 77} 78 79static QualType getFunctionOrMethodArgType(Decl *d, unsigned Idx) { 80 if (const FunctionType *FnTy = getFunctionType(d)) { 81 const FunctionTypeProto *proto = cast<FunctionTypeProto>(FnTy); 82 return proto->getArgType(Idx); 83 } else { 84 return cast<ObjCMethodDecl>(d)->getParamDecl(Idx)->getType(); 85 } 86} 87 88static bool isFunctionOrMethodVariadic(Decl *d) { 89 if (const FunctionType *FnTy = getFunctionType(d)) { 90 const FunctionTypeProto *proto = cast<FunctionTypeProto>(FnTy); 91 return proto->isVariadic(); 92 } else { 93 return cast<ObjCMethodDecl>(d)->isVariadic(); 94 } 95} 96 97static inline bool isNSStringType(QualType T, ASTContext &Ctx) { 98 const PointerType *PT = T->getAsPointerType(); 99 if (!PT) 100 return false; 101 102 const ObjCInterfaceType *ClsT =PT->getPointeeType()->getAsObjCInterfaceType(); 103 if (!ClsT) 104 return false; 105 106 IdentifierInfo* ClsName = ClsT->getDecl()->getIdentifier(); 107 108 // FIXME: Should we walk the chain of classes? 109 return ClsName == &Ctx.Idents.get("NSString") || 110 ClsName == &Ctx.Idents.get("NSMutableString"); 111} 112 113static inline bool isCFStringType(QualType T, ASTContext &Ctx) { 114 const PointerType *PT = T->getAsPointerType(); 115 if (!PT) 116 return false; 117 118 const RecordType *RT = PT->getPointeeType()->getAsRecordType(); 119 if (!RT) 120 return false; 121 122 const RecordDecl *RD = RT->getDecl(); 123 if (RD->getTagKind() != TagDecl::TK_struct) 124 return false; 125 126 return RD->getIdentifier() == &Ctx.Idents.get("__CFString"); 127} 128 129//===----------------------------------------------------------------------===// 130// Attribute Implementations 131//===----------------------------------------------------------------------===// 132 133// FIXME: All this manual attribute parsing code is gross. At the 134// least add some helper functions to check most argument patterns (# 135// and types of args). 136 137static void HandleExtVectorTypeAttr(Decl *d, const AttributeList &Attr, 138 Sema &S) { 139 TypedefDecl *tDecl = dyn_cast<TypedefDecl>(d); 140 if (tDecl == 0) { 141 S.Diag(Attr.getLoc(), diag::err_typecheck_ext_vector_not_typedef); 142 return; 143 } 144 145 QualType curType = tDecl->getUnderlyingType(); 146 // check the attribute arguments. 147 if (Attr.getNumArgs() != 1) { 148 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 149 return; 150 } 151 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 152 llvm::APSInt vecSize(32); 153 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 154 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 155 << "ext_vector_type" << sizeExpr->getSourceRange(); 156 return; 157 } 158 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 159 // in conjunction with complex types (pointers, arrays, functions, etc.). 160 if (!curType->isIntegerType() && !curType->isRealFloatingType()) { 161 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << curType; 162 return; 163 } 164 // unlike gcc's vector_size attribute, the size is specified as the 165 // number of elements, not the number of bytes. 166 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 167 168 if (vectorSize == 0) { 169 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 170 << sizeExpr->getSourceRange(); 171 return; 172 } 173 // Instantiate/Install the vector type, the number of elements is > 0. 174 tDecl->setUnderlyingType(S.Context.getExtVectorType(curType, vectorSize)); 175 // Remember this typedef decl, we will need it later for diagnostics. 176 S.ExtVectorDecls.push_back(tDecl); 177} 178 179 180/// HandleVectorSizeAttribute - this attribute is only applicable to 181/// integral and float scalars, although arrays, pointers, and function 182/// return values are allowed in conjunction with this construct. Aggregates 183/// with this attribute are invalid, even if they are of the same size as a 184/// corresponding scalar. 185/// The raw attribute should contain precisely 1 argument, the vector size 186/// for the variable, measured in bytes. If curType and rawAttr are well 187/// formed, this routine will return a new vector type. 188static void HandleVectorSizeAttr(Decl *D, const AttributeList &Attr, Sema &S) { 189 QualType CurType; 190 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) 191 CurType = VD->getType(); 192 else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) 193 CurType = TD->getUnderlyingType(); 194 else { 195 S.Diag(D->getLocation(), diag::err_attr_wrong_decl) 196 << "vector_size" << SourceRange(Attr.getLoc(), Attr.getLoc()); 197 return; 198 } 199 200 // Check the attribute arugments. 201 if (Attr.getNumArgs() != 1) { 202 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 203 return; 204 } 205 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 206 llvm::APSInt vecSize(32); 207 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 208 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 209 << "vector_size" << sizeExpr->getSourceRange(); 210 return; 211 } 212 // navigate to the base type - we need to provide for vector pointers, 213 // vector arrays, and functions returning vectors. 214 if (CurType->isPointerType() || CurType->isArrayType() || 215 CurType->isFunctionType()) { 216 assert(0 && "HandleVector(): Complex type construction unimplemented"); 217 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 218 do { 219 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 220 canonType = PT->getPointeeType().getTypePtr(); 221 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 222 canonType = AT->getElementType().getTypePtr(); 223 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 224 canonType = FT->getResultType().getTypePtr(); 225 } while (canonType->isPointerType() || canonType->isArrayType() || 226 canonType->isFunctionType()); 227 */ 228 } 229 // the base type must be integer or float. 230 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 231 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 232 return; 233 } 234 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 235 // vecSize is specified in bytes - convert to bits. 236 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 237 238 // the vector size needs to be an integral multiple of the type size. 239 if (vectorSize % typeSize) { 240 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 241 << sizeExpr->getSourceRange(); 242 return; 243 } 244 if (vectorSize == 0) { 245 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 246 << sizeExpr->getSourceRange(); 247 return; 248 } 249 250 // Success! Instantiate the vector type, the number of elements is > 0, and 251 // not required to be a power of 2, unlike GCC. 252 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize); 253 254 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) 255 VD->setType(CurType); 256 else 257 cast<TypedefDecl>(D)->setUnderlyingType(CurType); 258} 259 260static void HandlePackedAttr(Decl *d, const AttributeList &Attr, Sema &S) { 261 // check the attribute arguments. 262 if (Attr.getNumArgs() > 0) { 263 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 264 return; 265 } 266 267 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 268 TD->addAttr(new PackedAttr(1)); 269 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 270 // If the alignment is less than or equal to 8 bits, the packed attribute 271 // has no effect. 272 if (!FD->getType()->isIncompleteType() && 273 S.Context.getTypeAlign(FD->getType()) <= 8) 274 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored_for_field_of_type) 275 << Attr.getName() << FD->getType(); 276 else 277 FD->addAttr(new PackedAttr(1)); 278 } else 279 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName(); 280} 281 282static void HandleIBOutletAttr(Decl *d, const AttributeList &Attr, Sema &S) { 283 // check the attribute arguments. 284 if (Attr.getNumArgs() > 0) { 285 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 286 return; 287 } 288 289 // The IBOutlet attribute only applies to instance variables of Objective-C 290 // classes. 291 if (ObjCIvarDecl *ID = dyn_cast<ObjCIvarDecl>(d)) 292 ID->addAttr(new IBOutletAttr()); 293 else 294 S.Diag(Attr.getLoc(), diag::err_attribute_iboutlet_non_ivar); 295} 296 297static void HandleNonNullAttr(Decl *d, const AttributeList &Attr, Sema &S) { 298 // GCC ignores the nonnull attribute on K&R style function 299 // prototypes, so we ignore it as well 300 if (!isFunctionOrMethod(d) || !hasFunctionProto(d)) { 301 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 302 << "nonnull" << "function"; 303 return; 304 } 305 306 unsigned NumArgs = getFunctionOrMethodNumArgs(d); 307 308 // The nonnull attribute only applies to pointers. 309 llvm::SmallVector<unsigned, 10> NonNullArgs; 310 311 for (AttributeList::arg_iterator I=Attr.arg_begin(), 312 E=Attr.arg_end(); I!=E; ++I) { 313 314 315 // The argument must be an integer constant expression. 316 Expr *Ex = static_cast<Expr *>(*I); 317 llvm::APSInt ArgNum(32); 318 if (!Ex->isIntegerConstantExpr(ArgNum, S.Context)) { 319 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 320 << "nonnull" << Ex->getSourceRange(); 321 return; 322 } 323 324 unsigned x = (unsigned) ArgNum.getZExtValue(); 325 326 if (x < 1 || x > NumArgs) { 327 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 328 << "nonnull" << I.getArgNum() << Ex->getSourceRange(); 329 return; 330 } 331 332 --x; 333 334 // Is the function argument a pointer type? 335 QualType T = getFunctionOrMethodArgType(d, x); 336 if (!T->isPointerType() && !T->isBlockPointerType()) { 337 // FIXME: Should also highlight argument in decl. 338 S.Diag(Attr.getLoc(), diag::err_nonnull_pointers_only) 339 << "nonnull" << Ex->getSourceRange(); 340 continue; 341 } 342 343 NonNullArgs.push_back(x); 344 } 345 346 // If no arguments were specified to __attribute__((nonnull)) then all 347 // pointer arguments have a nonnull attribute. 348 if (NonNullArgs.empty()) { 349 for (unsigned I = 0, E = getFunctionOrMethodNumArgs(d); I != E; ++I) { 350 QualType T = getFunctionOrMethodArgType(d, I); 351 if (T->isPointerType() || T->isBlockPointerType()) 352 NonNullArgs.push_back(I); 353 } 354 355 if (NonNullArgs.empty()) { 356 S.Diag(Attr.getLoc(), diag::warn_attribute_nonnull_no_pointers); 357 return; 358 } 359 } 360 361 unsigned* start = &NonNullArgs[0]; 362 unsigned size = NonNullArgs.size(); 363 std::sort(start, start + size); 364 d->addAttr(new NonNullAttr(start, size)); 365} 366 367static void HandleAliasAttr(Decl *d, const AttributeList &Attr, Sema &S) { 368 // check the attribute arguments. 369 if (Attr.getNumArgs() != 1) { 370 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 371 return; 372 } 373 374 Expr *Arg = static_cast<Expr*>(Attr.getArg(0)); 375 Arg = Arg->IgnoreParenCasts(); 376 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 377 378 if (Str == 0 || Str->isWide()) { 379 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 380 << "alias" << 1; 381 return; 382 } 383 384 const char *Alias = Str->getStrData(); 385 unsigned AliasLen = Str->getByteLength(); 386 387 // FIXME: check if target symbol exists in current file 388 389 d->addAttr(new AliasAttr(std::string(Alias, AliasLen))); 390} 391 392static void HandleAlwaysInlineAttr(Decl *d, const AttributeList &Attr, 393 Sema &S) { 394 // check the attribute arguments. 395 if (Attr.getNumArgs() != 0) { 396 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 397 return; 398 } 399 400 d->addAttr(new AlwaysInlineAttr()); 401} 402 403static void HandleNoReturnAttr(Decl *d, const AttributeList &Attr, Sema &S) { 404 // check the attribute arguments. 405 if (Attr.getNumArgs() != 0) { 406 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 407 return; 408 } 409 410 if (!isFunctionOrMethod(d)) { 411 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 412 << "noreturn" << "function"; 413 return; 414 } 415 416 d->addAttr(new NoReturnAttr()); 417} 418 419static void HandleUnusedAttr(Decl *d, const AttributeList &Attr, Sema &S) { 420 // check the attribute arguments. 421 if (Attr.getNumArgs() != 0) { 422 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 423 return; 424 } 425 426 if (!isa<VarDecl>(d) && !isFunctionOrMethod(d)) { 427 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 428 << "unused" << "variable and function"; 429 return; 430 } 431 432 d->addAttr(new UnusedAttr()); 433} 434 435static void HandleConstructorAttr(Decl *d, const AttributeList &Attr, Sema &S) { 436 // check the attribute arguments. 437 if (Attr.getNumArgs() != 0 && Attr.getNumArgs() != 1) { 438 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 439 << "0 or 1"; 440 return; 441 } 442 443 int priority = 65535; // FIXME: Do not hardcode such constants. 444 if (Attr.getNumArgs() > 0) { 445 Expr *E = static_cast<Expr *>(Attr.getArg(0)); 446 llvm::APSInt Idx(32); 447 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 448 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 449 << "constructor" << 1 << E->getSourceRange(); 450 return; 451 } 452 priority = Idx.getZExtValue(); 453 } 454 455 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 456 if (!Fn) { 457 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 458 << "constructor" << "function"; 459 return; 460 } 461 462 d->addAttr(new ConstructorAttr(priority)); 463} 464 465static void HandleDestructorAttr(Decl *d, const AttributeList &Attr, Sema &S) { 466 // check the attribute arguments. 467 if (Attr.getNumArgs() != 0 && Attr.getNumArgs() != 1) { 468 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 469 << "0 or 1"; 470 return; 471 } 472 473 int priority = 65535; // FIXME: Do not hardcode such constants. 474 if (Attr.getNumArgs() > 0) { 475 Expr *E = static_cast<Expr *>(Attr.getArg(0)); 476 llvm::APSInt Idx(32); 477 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 478 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 479 << "destructor" << 1 << E->getSourceRange(); 480 return; 481 } 482 priority = Idx.getZExtValue(); 483 } 484 485 if (!isa<FunctionDecl>(d)) { 486 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 487 << "destructor" << "function"; 488 return; 489 } 490 491 d->addAttr(new DestructorAttr(priority)); 492} 493 494static void HandleDeprecatedAttr(Decl *d, const AttributeList &Attr, Sema &S) { 495 // check the attribute arguments. 496 if (Attr.getNumArgs() != 0) { 497 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 498 return; 499 } 500 501 d->addAttr(new DeprecatedAttr()); 502} 503 504static void HandleUnavailableAttr(Decl *d, const AttributeList &Attr, Sema &S) { 505 // check the attribute arguments. 506 if (Attr.getNumArgs() != 0) { 507 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 508 return; 509 } 510 511 d->addAttr(new UnavailableAttr()); 512} 513 514static void HandleVisibilityAttr(Decl *d, const AttributeList &Attr, Sema &S) { 515 // check the attribute arguments. 516 if (Attr.getNumArgs() != 1) { 517 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 518 return; 519 } 520 521 Expr *Arg = static_cast<Expr*>(Attr.getArg(0)); 522 Arg = Arg->IgnoreParenCasts(); 523 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 524 525 if (Str == 0 || Str->isWide()) { 526 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 527 << "visibility" << 1; 528 return; 529 } 530 531 const char *TypeStr = Str->getStrData(); 532 unsigned TypeLen = Str->getByteLength(); 533 VisibilityAttr::VisibilityTypes type; 534 535 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 536 type = VisibilityAttr::DefaultVisibility; 537 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 538 type = VisibilityAttr::HiddenVisibility; 539 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 540 type = VisibilityAttr::HiddenVisibility; // FIXME 541 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 542 type = VisibilityAttr::ProtectedVisibility; 543 else { 544 S.Diag(Attr.getLoc(), diag::warn_attribute_unknown_visibility) << TypeStr; 545 return; 546 } 547 548 d->addAttr(new VisibilityAttr(type)); 549} 550 551static void HandleObjCGCAttr(Decl *d, const AttributeList &Attr, Sema &S) { 552 if (!Attr.getParameterName()) { 553 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 554 << "objc_gc" << 1; 555 return; 556 } 557 558 if (Attr.getNumArgs() != 0) { 559 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 560 return; 561 } 562 563 564 ObjCGCAttr::GCAttrTypes type; 565 if (Attr.getParameterName()->isStr("weak")) { 566 if (isa<FieldDecl>(d) && !isa<ObjCIvarDecl>(d)) 567 S.Diag(Attr.getLoc(), diag::warn_attribute_weak_on_field); 568 type = ObjCGCAttr::Weak; 569 } 570 else if (Attr.getParameterName()->isStr("strong")) 571 type = ObjCGCAttr::Strong; 572 else { 573 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 574 << "objc_gc" << Attr.getParameterName(); 575 return; 576 } 577 578 d->addAttr(new ObjCGCAttr(type)); 579} 580 581static void HandleBlocksAttr(Decl *d, const AttributeList &Attr, Sema &S) { 582 if (!Attr.getParameterName()) { 583 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 584 << "blocks" << 1; 585 return; 586 } 587 588 if (Attr.getNumArgs() != 0) { 589 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 590 return; 591 } 592 593 BlocksAttr::BlocksAttrTypes type; 594 if (Attr.getParameterName()->isStr("byref")) 595 type = BlocksAttr::ByRef; 596 else { 597 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 598 << "blocks" << Attr.getParameterName(); 599 return; 600 } 601 602 d->addAttr(new BlocksAttr(type)); 603} 604 605static void HandleSentinelAttr(Decl *d, const AttributeList &Attr, Sema &S) { 606 // check the attribute arguments. 607 if (Attr.getNumArgs() > 2) { 608 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 609 << "0, 1 or 2"; 610 return; 611 } 612 613 int sentinel = 0; 614 if (Attr.getNumArgs() > 0) { 615 Expr *E = static_cast<Expr *>(Attr.getArg(0)); 616 llvm::APSInt Idx(32); 617 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 618 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 619 << "sentinel" << 1 << E->getSourceRange(); 620 return; 621 } 622 sentinel = Idx.getZExtValue(); 623 624 if (sentinel < 0) { 625 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero) 626 << E->getSourceRange(); 627 return; 628 } 629 } 630 631 int nullPos = 0; 632 if (Attr.getNumArgs() > 1) { 633 Expr *E = static_cast<Expr *>(Attr.getArg(1)); 634 llvm::APSInt Idx(32); 635 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 636 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 637 << "sentinel" << 2 << E->getSourceRange(); 638 return; 639 } 640 nullPos = Idx.getZExtValue(); 641 642 if (nullPos > 1 || nullPos < 0) { 643 // FIXME: This error message could be improved, it would be nice 644 // to say what the bounds actually are. 645 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one) 646 << E->getSourceRange(); 647 return; 648 } 649 } 650 651 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(d)) { 652 QualType FT = FD->getType(); 653 if (!FT->getAsFunctionTypeProto()->isVariadic()) { 654 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic); 655 return; 656 } 657 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(d)) { 658 if (!MD->isVariadic()) { 659 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic); 660 return; 661 } 662 } else { 663 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 664 << "sentinel" << "function or method"; 665 return; 666 } 667 668 // FIXME: Actually create the attribute. 669} 670 671static void HandleWeakAttr(Decl *d, const AttributeList &Attr, Sema &S) { 672 // check the attribute arguments. 673 if (Attr.getNumArgs() != 0) { 674 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 675 return; 676 } 677 678 d->addAttr(new WeakAttr()); 679} 680 681static void HandleDLLImportAttr(Decl *d, const AttributeList &Attr, Sema &S) { 682 // check the attribute arguments. 683 if (Attr.getNumArgs() != 0) { 684 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 685 return; 686 } 687 688 d->addAttr(new DLLImportAttr()); 689} 690 691static void HandleDLLExportAttr(Decl *d, const AttributeList &Attr, Sema &S) { 692 // check the attribute arguments. 693 if (Attr.getNumArgs() != 0) { 694 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 695 return; 696 } 697 698 d->addAttr(new DLLExportAttr()); 699} 700 701static void HandleStdCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { 702 // check the attribute arguments. 703 if (Attr.getNumArgs() != 0) { 704 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 705 return; 706 } 707 708 d->addAttr(new StdCallAttr()); 709} 710 711static void HandleFastCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { 712 // check the attribute arguments. 713 if (Attr.getNumArgs() != 0) { 714 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 715 return; 716 } 717 718 d->addAttr(new FastCallAttr()); 719} 720 721static void HandleNothrowAttr(Decl *d, const AttributeList &Attr, Sema &S) { 722 // check the attribute arguments. 723 if (Attr.getNumArgs() != 0) { 724 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 725 return; 726 } 727 728 d->addAttr(new NoThrowAttr()); 729} 730 731static void HandleConstAttr(Decl *d, const AttributeList &Attr, Sema &S) { 732 // check the attribute arguments. 733 if (Attr.getNumArgs() != 0) { 734 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 735 return; 736 } 737 738 d->addAttr(new ConstAttr()); 739} 740 741static void HandlePureAttr(Decl *d, const AttributeList &Attr, Sema &S) { 742 // check the attribute arguments. 743 if (Attr.getNumArgs() != 0) { 744 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 745 return; 746 } 747 748 d->addAttr(new PureAttr()); 749} 750 751/// Handle __attribute__((format(type,idx,firstarg))) attributes 752/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 753static void HandleFormatAttr(Decl *d, const AttributeList &Attr, Sema &S) { 754 755 if (!Attr.getParameterName()) { 756 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 757 << "format" << 1; 758 return; 759 } 760 761 if (Attr.getNumArgs() != 2) { 762 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 3; 763 return; 764 } 765 766 if (!isFunctionOrMethod(d) || !hasFunctionProto(d)) { 767 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 768 << "format" << "function"; 769 return; 770 } 771 772 // FIXME: in C++ the implicit 'this' function parameter also counts. 773 // this is needed in order to be compatible with GCC 774 // the index must start in 1 and the limit is numargs+1 775 unsigned NumArgs = getFunctionOrMethodNumArgs(d); 776 unsigned FirstIdx = 1; 777 778 const char *Format = Attr.getParameterName()->getName(); 779 unsigned FormatLen = Attr.getParameterName()->getLength(); 780 781 // Normalize the argument, __foo__ becomes foo. 782 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 783 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 784 Format += 2; 785 FormatLen -= 4; 786 } 787 788 bool Supported = false; 789 bool is_NSString = false; 790 bool is_strftime = false; 791 bool is_CFString = false; 792 793 switch (FormatLen) { 794 default: break; 795 case 5: Supported = !memcmp(Format, "scanf", 5); break; 796 case 6: Supported = !memcmp(Format, "printf", 6); break; 797 case 7: Supported = !memcmp(Format, "strfmon", 7); break; 798 case 8: 799 Supported = (is_strftime = !memcmp(Format, "strftime", 8)) || 800 (is_NSString = !memcmp(Format, "NSString", 8)) || 801 (is_CFString = !memcmp(Format, "CFString", 8)); 802 break; 803 } 804 805 if (!Supported) { 806 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 807 << "format" << Attr.getParameterName()->getName(); 808 return; 809 } 810 811 // checks for the 2nd argument 812 Expr *IdxExpr = static_cast<Expr *>(Attr.getArg(0)); 813 llvm::APSInt Idx(32); 814 if (!IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { 815 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 816 << "format" << 2 << IdxExpr->getSourceRange(); 817 return; 818 } 819 820 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 821 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 822 << "format" << 2 << IdxExpr->getSourceRange(); 823 return; 824 } 825 826 // FIXME: Do we need to bounds check? 827 unsigned ArgIdx = Idx.getZExtValue() - 1; 828 829 // make sure the format string is really a string 830 QualType Ty = getFunctionOrMethodArgType(d, ArgIdx); 831 832 if (is_CFString) { 833 if (!isCFStringType(Ty, S.Context)) { 834 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 835 << "a CFString" << IdxExpr->getSourceRange(); 836 return; 837 } 838 } else if (is_NSString) { 839 // FIXME: do we need to check if the type is NSString*? What are 840 // the semantics? 841 if (!isNSStringType(Ty, S.Context)) { 842 // FIXME: Should highlight the actual expression that has the 843 // wrong type. 844 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 845 << "an NSString" << IdxExpr->getSourceRange(); 846 return; 847 } 848 } else if (!Ty->isPointerType() || 849 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 850 // FIXME: Should highlight the actual expression that has the 851 // wrong type. 852 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 853 << "a string type" << IdxExpr->getSourceRange(); 854 return; 855 } 856 857 // check the 3rd argument 858 Expr *FirstArgExpr = static_cast<Expr *>(Attr.getArg(1)); 859 llvm::APSInt FirstArg(32); 860 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) { 861 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 862 << "format" << 3 << FirstArgExpr->getSourceRange(); 863 return; 864 } 865 866 // check if the function is variadic if the 3rd argument non-zero 867 if (FirstArg != 0) { 868 if (isFunctionOrMethodVariadic(d)) { 869 ++NumArgs; // +1 for ... 870 } else { 871 S.Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 872 return; 873 } 874 } 875 876 // strftime requires FirstArg to be 0 because it doesn't read from any 877 // variable the input is just the current time + the format string. 878 if (is_strftime) { 879 if (FirstArg != 0) { 880 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter) 881 << FirstArgExpr->getSourceRange(); 882 return; 883 } 884 // if 0 it disables parameter checking (to use with e.g. va_list) 885 } else if (FirstArg != 0 && FirstArg != NumArgs) { 886 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 887 << "format" << 3 << FirstArgExpr->getSourceRange(); 888 return; 889 } 890 891 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 892 Idx.getZExtValue(), FirstArg.getZExtValue())); 893} 894 895static void HandleTransparentUnionAttr(Decl *d, const AttributeList &Attr, 896 Sema &S) { 897 // check the attribute arguments. 898 if (Attr.getNumArgs() != 0) { 899 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 900 return; 901 } 902 903 // FIXME: This shouldn't be restricted to typedefs 904 TypedefDecl *TD = dyn_cast<TypedefDecl>(d); 905 if (!TD || !TD->getUnderlyingType()->isUnionType()) { 906 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 907 << "transparent_union" << "union"; 908 return; 909 } 910 911 RecordDecl* RD = TD->getUnderlyingType()->getAsUnionType()->getDecl(); 912 913 // FIXME: Should we do a check for RD->isDefinition()? 914 915 // FIXME: This isn't supposed to be restricted to pointers, but otherwise 916 // we might silently generate incorrect code; see following code 917 for (RecordDecl::field_iterator Field = RD->field_begin(), 918 FieldEnd = RD->field_end(); 919 Field != FieldEnd; ++Field) { 920 if (!Field->getType()->isPointerType()) { 921 S.Diag(Attr.getLoc(), diag::warn_transparent_union_nonpointer); 922 return; 923 } 924 } 925 926 // FIXME: This is a complete hack; we should be properly propagating 927 // transparent_union through Sema. That said, this is close enough to 928 // correctly compile all the common cases of transparent_union without 929 // errors or warnings 930 QualType NewTy = S.Context.VoidPtrTy; 931 NewTy.addConst(); 932 TD->setUnderlyingType(NewTy); 933} 934 935static void HandleAnnotateAttr(Decl *d, const AttributeList &Attr, Sema &S) { 936 // check the attribute arguments. 937 if (Attr.getNumArgs() != 1) { 938 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 939 return; 940 } 941 Expr *argExpr = static_cast<Expr *>(Attr.getArg(0)); 942 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 943 944 // Make sure that there is a string literal as the annotation's single 945 // argument. 946 if (!SE) { 947 S.Diag(Attr.getLoc(), diag::err_attribute_annotate_no_string); 948 return; 949 } 950 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 951 SE->getByteLength()))); 952} 953 954static void HandleAlignedAttr(Decl *d, const AttributeList &Attr, Sema &S) { 955 // check the attribute arguments. 956 if (Attr.getNumArgs() > 1) { 957 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 958 return; 959 } 960 961 unsigned Align = 0; 962 if (Attr.getNumArgs() == 0) { 963 // FIXME: This should be the target specific maximum alignment. 964 // (For now we just use 128 bits which is the maximum on X86. 965 Align = 128; 966 return; 967 } 968 969 Expr *alignmentExpr = static_cast<Expr *>(Attr.getArg(0)); 970 llvm::APSInt Alignment(32); 971 if (!alignmentExpr->isIntegerConstantExpr(Alignment, S.Context)) { 972 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 973 << "aligned" << alignmentExpr->getSourceRange(); 974 return; 975 } 976 d->addAttr(new AlignedAttr(Alignment.getZExtValue() * 8)); 977} 978 979/// HandleModeAttr - This attribute modifies the width of a decl with 980/// primitive type. 981/// 982/// Despite what would be logical, the mode attribute is a decl attribute, 983/// not a type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 984/// 'G' be HImode, not an intermediate pointer. 985/// 986static void HandleModeAttr(Decl *D, const AttributeList &Attr, Sema &S) { 987 // This attribute isn't documented, but glibc uses it. It changes 988 // the width of an int or unsigned int to the specified size. 989 990 // Check that there aren't any arguments 991 if (Attr.getNumArgs() != 0) { 992 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 993 return; 994 } 995 996 IdentifierInfo *Name = Attr.getParameterName(); 997 if (!Name) { 998 S.Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name); 999 return; 1000 } 1001 const char *Str = Name->getName(); 1002 unsigned Len = Name->getLength(); 1003 1004 // Normalize the attribute name, __foo__ becomes foo. 1005 if (Len > 4 && Str[0] == '_' && Str[1] == '_' && 1006 Str[Len - 2] == '_' && Str[Len - 1] == '_') { 1007 Str += 2; 1008 Len -= 4; 1009 } 1010 1011 unsigned DestWidth = 0; 1012 bool IntegerMode = true; 1013 switch (Len) { 1014 case 2: 1015 if (!memcmp(Str, "QI", 2)) { DestWidth = 8; break; } 1016 if (!memcmp(Str, "HI", 2)) { DestWidth = 16; break; } 1017 if (!memcmp(Str, "SI", 2)) { DestWidth = 32; break; } 1018 if (!memcmp(Str, "DI", 2)) { DestWidth = 64; break; } 1019 if (!memcmp(Str, "TI", 2)) { DestWidth = 128; break; } 1020 if (!memcmp(Str, "SF", 2)) { DestWidth = 32; IntegerMode = false; break; } 1021 if (!memcmp(Str, "DF", 2)) { DestWidth = 64; IntegerMode = false; break; } 1022 if (!memcmp(Str, "XF", 2)) { DestWidth = 96; IntegerMode = false; break; } 1023 if (!memcmp(Str, "TF", 2)) { DestWidth = 128; IntegerMode = false; break; } 1024 break; 1025 case 4: 1026 // FIXME: glibc uses 'word' to define register_t; this is narrower than a 1027 // pointer on PIC16 and other embedded platforms. 1028 if (!memcmp(Str, "word", 4)) 1029 DestWidth = S.Context.Target.getPointerWidth(0); 1030 if (!memcmp(Str, "byte", 4)) 1031 DestWidth = S.Context.Target.getCharWidth(); 1032 break; 1033 case 7: 1034 if (!memcmp(Str, "pointer", 7)) 1035 DestWidth = S.Context.Target.getPointerWidth(0); 1036 break; 1037 } 1038 1039 QualType OldTy; 1040 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) 1041 OldTy = TD->getUnderlyingType(); 1042 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) 1043 OldTy = VD->getType(); 1044 else { 1045 S.Diag(D->getLocation(), diag::err_attr_wrong_decl) 1046 << "mode" << SourceRange(Attr.getLoc(), Attr.getLoc()); 1047 return; 1048 } 1049 1050 // FIXME: Need proper fixed-width types 1051 QualType NewTy; 1052 switch (DestWidth) { 1053 case 0: 1054 S.Diag(Attr.getLoc(), diag::err_unknown_machine_mode) << Name; 1055 return; 1056 default: 1057 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 1058 return; 1059 case 8: 1060 assert(IntegerMode); 1061 if (OldTy->isSignedIntegerType()) 1062 NewTy = S.Context.SignedCharTy; 1063 else 1064 NewTy = S.Context.UnsignedCharTy; 1065 break; 1066 case 16: 1067 assert(IntegerMode); 1068 if (OldTy->isSignedIntegerType()) 1069 NewTy = S.Context.ShortTy; 1070 else 1071 NewTy = S.Context.UnsignedShortTy; 1072 break; 1073 case 32: 1074 if (!IntegerMode) 1075 NewTy = S.Context.FloatTy; 1076 else if (OldTy->isSignedIntegerType()) 1077 NewTy = S.Context.IntTy; 1078 else 1079 NewTy = S.Context.UnsignedIntTy; 1080 break; 1081 case 64: 1082 if (!IntegerMode) 1083 NewTy = S.Context.DoubleTy; 1084 else if (OldTy->isSignedIntegerType()) 1085 NewTy = S.Context.LongLongTy; 1086 else 1087 NewTy = S.Context.UnsignedLongLongTy; 1088 break; 1089 } 1090 1091 if (!OldTy->getAsBuiltinType()) 1092 S.Diag(Attr.getLoc(), diag::err_mode_not_primitive); 1093 else if (!(IntegerMode && OldTy->isIntegerType()) && 1094 !(!IntegerMode && OldTy->isFloatingType())) { 1095 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); 1096 } 1097 1098 // Install the new type. 1099 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) 1100 TD->setUnderlyingType(NewTy); 1101 else 1102 cast<ValueDecl>(D)->setType(NewTy); 1103} 1104 1105//===----------------------------------------------------------------------===// 1106// Top Level Sema Entry Points 1107//===----------------------------------------------------------------------===// 1108 1109/// ProcessDeclAttribute - Apply the specific attribute to the specified decl if 1110/// the attribute applies to decls. If the attribute is a type attribute, just 1111/// silently ignore it. 1112static void ProcessDeclAttribute(Decl *D, const AttributeList &Attr, Sema &S) { 1113 switch (Attr.getKind()) { 1114 case AttributeList::AT_IBOutlet: HandleIBOutletAttr (D, Attr, S); break; 1115 case AttributeList::AT_address_space: 1116 // Ignore this, this is a type attribute, handled by ProcessTypeAttributes. 1117 break; 1118 case AttributeList::AT_alias: HandleAliasAttr (D, Attr, S); break; 1119 case AttributeList::AT_aligned: HandleAlignedAttr (D, Attr, S); break; 1120 case AttributeList::AT_always_inline: 1121 HandleAlwaysInlineAttr (D, Attr, S); break; 1122 case AttributeList::AT_annotate: HandleAnnotateAttr (D, Attr, S); break; 1123 case AttributeList::AT_constructor: HandleConstructorAttr(D, Attr, S); break; 1124 case AttributeList::AT_deprecated: HandleDeprecatedAttr(D, Attr, S); break; 1125 case AttributeList::AT_destructor: HandleDestructorAttr(D, Attr, S); break; 1126 case AttributeList::AT_dllexport: HandleDLLExportAttr (D, Attr, S); break; 1127 case AttributeList::AT_dllimport: HandleDLLImportAttr (D, Attr, S); break; 1128 case AttributeList::AT_ext_vector_type: 1129 HandleExtVectorTypeAttr(D, Attr, S); 1130 break; 1131 case AttributeList::AT_fastcall: HandleFastCallAttr (D, Attr, S); break; 1132 case AttributeList::AT_format: HandleFormatAttr (D, Attr, S); break; 1133 case AttributeList::AT_mode: HandleModeAttr (D, Attr, S); break; 1134 case AttributeList::AT_nonnull: HandleNonNullAttr (D, Attr, S); break; 1135 case AttributeList::AT_noreturn: HandleNoReturnAttr (D, Attr, S); break; 1136 case AttributeList::AT_nothrow: HandleNothrowAttr (D, Attr, S); break; 1137 case AttributeList::AT_packed: HandlePackedAttr (D, Attr, S); break; 1138 case AttributeList::AT_stdcall: HandleStdCallAttr (D, Attr, S); break; 1139 case AttributeList::AT_unavailable: HandleUnavailableAttr(D, Attr, S); break; 1140 case AttributeList::AT_unused: HandleUnusedAttr (D, Attr, S); break; 1141 case AttributeList::AT_vector_size: HandleVectorSizeAttr(D, Attr, S); break; 1142 case AttributeList::AT_visibility: HandleVisibilityAttr(D, Attr, S); break; 1143 case AttributeList::AT_weak: HandleWeakAttr (D, Attr, S); break; 1144 case AttributeList::AT_transparent_union: 1145 HandleTransparentUnionAttr(D, Attr, S); 1146 break; 1147 case AttributeList::AT_objc_gc: HandleObjCGCAttr (D, Attr, S); break; 1148 case AttributeList::AT_blocks: HandleBlocksAttr (D, Attr, S); break; 1149 case AttributeList::AT_sentinel: HandleSentinelAttr (D, Attr, S); break; 1150 case AttributeList::AT_const: HandleConstAttr (D, Attr, S); break; 1151 case AttributeList::AT_pure: HandlePureAttr (D, Attr, S); break; 1152 default: 1153#if 0 1154 // TODO: when we have the full set of attributes, warn about unknown ones. 1155 S.Diag(Attr->getLoc(), diag::warn_attribute_ignored) << Attr->getName(); 1156#endif 1157 break; 1158 } 1159} 1160 1161/// ProcessDeclAttributeList - Apply all the decl attributes in the specified 1162/// attribute list to the specified decl, ignoring any type attributes. 1163void Sema::ProcessDeclAttributeList(Decl *D, const AttributeList *AttrList) { 1164 while (AttrList) { 1165 ProcessDeclAttribute(D, *AttrList, *this); 1166 AttrList = AttrList->getNext(); 1167 } 1168} 1169 1170 1171/// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in 1172/// it, apply them to D. This is a bit tricky because PD can have attributes 1173/// specified in many different places, and we need to find and apply them all. 1174void Sema::ProcessDeclAttributes(Decl *D, const Declarator &PD) { 1175 // Apply decl attributes from the DeclSpec if present. 1176 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes()) 1177 ProcessDeclAttributeList(D, Attrs); 1178 1179 // Walk the declarator structure, applying decl attributes that were in a type 1180 // position to the decl itself. This handles cases like: 1181 // int *__attr__(x)** D; 1182 // when X is a decl attribute. 1183 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i) 1184 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs()) 1185 ProcessDeclAttributeList(D, Attrs); 1186 1187 // Finally, apply any attributes on the decl itself. 1188 if (const AttributeList *Attrs = PD.getAttributes()) 1189 ProcessDeclAttributeList(D, Attrs); 1190} 1191 1192