SemaDeclAttr.cpp revision 52a425b852e4641d46073a697a48a457c8f655e2
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/DiagnosticSema.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 HandleObjCNSObject(Decl *d, const AttributeList &Attr, Sema &S) { 582 if (Attr.getNumArgs() != 0) { 583 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 584 return; 585 } 586 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(d)) { 587 QualType T = TD->getUnderlyingType(); 588 if (!T->isPointerType() || 589 !T->getAsPointerType()->getPointeeType()->isRecordType()) { 590 S.Diag(TD->getLocation(), diag::err_nsobject_attribute); 591 return; 592 } 593 } 594 d->addAttr(new ObjCNSObjectAttr); 595} 596 597static void HandleBlocksAttr(Decl *d, const AttributeList &Attr, Sema &S) { 598 if (!Attr.getParameterName()) { 599 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 600 << "blocks" << 1; 601 return; 602 } 603 604 if (Attr.getNumArgs() != 0) { 605 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 606 return; 607 } 608 609 BlocksAttr::BlocksAttrTypes type; 610 if (Attr.getParameterName()->isStr("byref")) 611 type = BlocksAttr::ByRef; 612 else { 613 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 614 << "blocks" << Attr.getParameterName(); 615 return; 616 } 617 618 d->addAttr(new BlocksAttr(type)); 619} 620 621static void HandleSentinelAttr(Decl *d, const AttributeList &Attr, Sema &S) { 622 // check the attribute arguments. 623 if (Attr.getNumArgs() > 2) { 624 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 625 << "0, 1 or 2"; 626 return; 627 } 628 629 int sentinel = 0; 630 if (Attr.getNumArgs() > 0) { 631 Expr *E = static_cast<Expr *>(Attr.getArg(0)); 632 llvm::APSInt Idx(32); 633 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 634 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 635 << "sentinel" << 1 << E->getSourceRange(); 636 return; 637 } 638 sentinel = Idx.getZExtValue(); 639 640 if (sentinel < 0) { 641 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_less_than_zero) 642 << E->getSourceRange(); 643 return; 644 } 645 } 646 647 int nullPos = 0; 648 if (Attr.getNumArgs() > 1) { 649 Expr *E = static_cast<Expr *>(Attr.getArg(1)); 650 llvm::APSInt Idx(32); 651 if (!E->isIntegerConstantExpr(Idx, S.Context)) { 652 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 653 << "sentinel" << 2 << E->getSourceRange(); 654 return; 655 } 656 nullPos = Idx.getZExtValue(); 657 658 if (nullPos > 1 || nullPos < 0) { 659 // FIXME: This error message could be improved, it would be nice 660 // to say what the bounds actually are. 661 S.Diag(Attr.getLoc(), diag::err_attribute_sentinel_not_zero_or_one) 662 << E->getSourceRange(); 663 return; 664 } 665 } 666 667 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(d)) { 668 QualType FT = FD->getType(); 669 if (!FT->getAsFunctionTypeProto()->isVariadic()) { 670 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic); 671 return; 672 } 673 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(d)) { 674 if (!MD->isVariadic()) { 675 S.Diag(Attr.getLoc(), diag::warn_attribute_sentinel_not_variadic); 676 return; 677 } 678 } else { 679 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 680 << "sentinel" << "function or method"; 681 return; 682 } 683 684 // FIXME: Actually create the attribute. 685} 686 687static void HandleWeakAttr(Decl *d, const AttributeList &Attr, Sema &S) { 688 // check the attribute arguments. 689 if (Attr.getNumArgs() != 0) { 690 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 691 return; 692 } 693 694 d->addAttr(new WeakAttr()); 695} 696 697static void HandleDLLImportAttr(Decl *d, const AttributeList &Attr, Sema &S) { 698 // check the attribute arguments. 699 if (Attr.getNumArgs() != 0) { 700 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 701 return; 702 } 703 704 // Attribute can be applied only to functions or variables. 705 if (isa<VarDecl>(d)) { 706 d->addAttr(new DLLImportAttr()); 707 return; 708 } 709 710 FunctionDecl *FD = dyn_cast<FunctionDecl>(d); 711 if (!FD) { 712 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 713 << "dllimport" << "function or variable"; 714 return; 715 } 716 717 // Currently, the dllimport attribute is ignored for inlined functions. 718 // Warning is emitted. 719 if (FD->isInline()) { 720 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; 721 return; 722 } 723 724 // The attribute is also overridden by a subsequent declaration as dllexport. 725 // Warning is emitted. 726 for (AttributeList *nextAttr = Attr.getNext(); nextAttr; 727 nextAttr = nextAttr->getNext()) { 728 if (nextAttr->getKind() == AttributeList::AT_dllexport) { 729 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; 730 return; 731 } 732 } 733 734 if (d->getAttr<DLLExportAttr>()) { 735 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllimport"; 736 return; 737 } 738 739 d->addAttr(new DLLImportAttr()); 740} 741 742static void HandleDLLExportAttr(Decl *d, const AttributeList &Attr, Sema &S) { 743 // check the attribute arguments. 744 if (Attr.getNumArgs() != 0) { 745 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 746 return; 747 } 748 749 // Attribute can be applied only to functions or variables. 750 if (isa<VarDecl>(d)) { 751 d->addAttr(new DLLExportAttr()); 752 return; 753 } 754 755 FunctionDecl *FD = dyn_cast<FunctionDecl>(d); 756 if (!FD) { 757 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 758 << "dllexport" << "function or variable"; 759 return; 760 } 761 762 // Currently, the dllexport attribute is ignored for inlined functions, 763 // unless the -fkeep-inline-functions flag has been used. Warning is emitted; 764 if (FD->isInline()) { 765 // FIXME: ... unless the -fkeep-inline-functions flag has been used. 766 S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "dllexport"; 767 return; 768 } 769 770 d->addAttr(new DLLExportAttr()); 771} 772 773static void HandleStdCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { 774 // Attribute has no arguments. 775 if (Attr.getNumArgs() != 0) { 776 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 777 return; 778 } 779 780 // Attribute can be applied only to functions. 781 if (!isa<FunctionDecl>(d)) { 782 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 783 << "stdcall" << "function"; 784 return; 785 } 786 787 // stdcall and fastcall attributes are mutually incompatible. 788 if (d->getAttr<FastCallAttr>()) { 789 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 790 << "stdcall" << "fastcall"; 791 return; 792 } 793 794 d->addAttr(new StdCallAttr()); 795} 796 797static void HandleFastCallAttr(Decl *d, const AttributeList &Attr, Sema &S) { 798 // Attribute has no arguments. 799 if (Attr.getNumArgs() != 0) { 800 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 801 return; 802 } 803 804 if (!isa<FunctionDecl>(d)) { 805 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 806 << "fastcall" << "function"; 807 return; 808 } 809 810 // stdcall and fastcall attributes are mutually incompatible. 811 if (d->getAttr<StdCallAttr>()) { 812 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 813 << "fastcall" << "stdcall"; 814 return; 815 } 816 817 d->addAttr(new FastCallAttr()); 818} 819 820static void HandleNothrowAttr(Decl *d, const AttributeList &Attr, Sema &S) { 821 // check the attribute arguments. 822 if (Attr.getNumArgs() != 0) { 823 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 824 return; 825 } 826 827 d->addAttr(new NoThrowAttr()); 828} 829 830static void HandleConstAttr(Decl *d, const AttributeList &Attr, Sema &S) { 831 // check the attribute arguments. 832 if (Attr.getNumArgs() != 0) { 833 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 834 return; 835 } 836 837 d->addAttr(new ConstAttr()); 838} 839 840static void HandlePureAttr(Decl *d, const AttributeList &Attr, Sema &S) { 841 // check the attribute arguments. 842 if (Attr.getNumArgs() != 0) { 843 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 844 return; 845 } 846 847 d->addAttr(new PureAttr()); 848} 849 850/// Handle __attribute__((format(type,idx,firstarg))) attributes 851/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 852static void HandleFormatAttr(Decl *d, const AttributeList &Attr, Sema &S) { 853 854 if (!Attr.getParameterName()) { 855 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 856 << "format" << 1; 857 return; 858 } 859 860 if (Attr.getNumArgs() != 2) { 861 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 3; 862 return; 863 } 864 865 if (!isFunctionOrMethod(d) || !hasFunctionProto(d)) { 866 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 867 << "format" << "function"; 868 return; 869 } 870 871 // FIXME: in C++ the implicit 'this' function parameter also counts. 872 // this is needed in order to be compatible with GCC 873 // the index must start in 1 and the limit is numargs+1 874 unsigned NumArgs = getFunctionOrMethodNumArgs(d); 875 unsigned FirstIdx = 1; 876 877 const char *Format = Attr.getParameterName()->getName(); 878 unsigned FormatLen = Attr.getParameterName()->getLength(); 879 880 // Normalize the argument, __foo__ becomes foo. 881 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 882 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 883 Format += 2; 884 FormatLen -= 4; 885 } 886 887 bool Supported = false; 888 bool is_NSString = false; 889 bool is_strftime = false; 890 bool is_CFString = false; 891 892 switch (FormatLen) { 893 default: break; 894 case 5: Supported = !memcmp(Format, "scanf", 5); break; 895 case 6: Supported = !memcmp(Format, "printf", 6); break; 896 case 7: Supported = !memcmp(Format, "strfmon", 7); break; 897 case 8: 898 Supported = (is_strftime = !memcmp(Format, "strftime", 8)) || 899 (is_NSString = !memcmp(Format, "NSString", 8)) || 900 (is_CFString = !memcmp(Format, "CFString", 8)); 901 break; 902 } 903 904 if (!Supported) { 905 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 906 << "format" << Attr.getParameterName()->getName(); 907 return; 908 } 909 910 // checks for the 2nd argument 911 Expr *IdxExpr = static_cast<Expr *>(Attr.getArg(0)); 912 llvm::APSInt Idx(32); 913 if (!IdxExpr->isIntegerConstantExpr(Idx, S.Context)) { 914 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 915 << "format" << 2 << IdxExpr->getSourceRange(); 916 return; 917 } 918 919 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 920 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 921 << "format" << 2 << IdxExpr->getSourceRange(); 922 return; 923 } 924 925 // FIXME: Do we need to bounds check? 926 unsigned ArgIdx = Idx.getZExtValue() - 1; 927 928 // make sure the format string is really a string 929 QualType Ty = getFunctionOrMethodArgType(d, ArgIdx); 930 931 if (is_CFString) { 932 if (!isCFStringType(Ty, S.Context)) { 933 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 934 << "a CFString" << IdxExpr->getSourceRange(); 935 return; 936 } 937 } else if (is_NSString) { 938 // FIXME: do we need to check if the type is NSString*? What are 939 // the semantics? 940 if (!isNSStringType(Ty, S.Context)) { 941 // FIXME: Should highlight the actual expression that has the 942 // wrong type. 943 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 944 << "an NSString" << IdxExpr->getSourceRange(); 945 return; 946 } 947 } else if (!Ty->isPointerType() || 948 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 949 // FIXME: Should highlight the actual expression that has the 950 // wrong type. 951 S.Diag(Attr.getLoc(), diag::err_format_attribute_not) 952 << "a string type" << IdxExpr->getSourceRange(); 953 return; 954 } 955 956 // check the 3rd argument 957 Expr *FirstArgExpr = static_cast<Expr *>(Attr.getArg(1)); 958 llvm::APSInt FirstArg(32); 959 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, S.Context)) { 960 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_int) 961 << "format" << 3 << FirstArgExpr->getSourceRange(); 962 return; 963 } 964 965 // check if the function is variadic if the 3rd argument non-zero 966 if (FirstArg != 0) { 967 if (isFunctionOrMethodVariadic(d)) { 968 ++NumArgs; // +1 for ... 969 } else { 970 S.Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 971 return; 972 } 973 } 974 975 // strftime requires FirstArg to be 0 because it doesn't read from any 976 // variable the input is just the current time + the format string. 977 if (is_strftime) { 978 if (FirstArg != 0) { 979 S.Diag(Attr.getLoc(), diag::err_format_strftime_third_parameter) 980 << FirstArgExpr->getSourceRange(); 981 return; 982 } 983 // if 0 it disables parameter checking (to use with e.g. va_list) 984 } else if (FirstArg != 0 && FirstArg != NumArgs) { 985 S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds) 986 << "format" << 3 << FirstArgExpr->getSourceRange(); 987 return; 988 } 989 990 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 991 Idx.getZExtValue(), FirstArg.getZExtValue())); 992} 993 994static void HandleTransparentUnionAttr(Decl *d, const AttributeList &Attr, 995 Sema &S) { 996 // check the attribute arguments. 997 if (Attr.getNumArgs() != 0) { 998 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 999 return; 1000 } 1001 1002 // FIXME: This shouldn't be restricted to typedefs 1003 TypedefDecl *TD = dyn_cast<TypedefDecl>(d); 1004 if (!TD || !TD->getUnderlyingType()->isUnionType()) { 1005 S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type) 1006 << "transparent_union" << "union"; 1007 return; 1008 } 1009 1010 RecordDecl* RD = TD->getUnderlyingType()->getAsUnionType()->getDecl(); 1011 1012 // FIXME: Should we do a check for RD->isDefinition()? 1013 1014 // FIXME: This isn't supposed to be restricted to pointers, but otherwise 1015 // we might silently generate incorrect code; see following code 1016 for (RecordDecl::field_iterator Field = RD->field_begin(), 1017 FieldEnd = RD->field_end(); 1018 Field != FieldEnd; ++Field) { 1019 if (!Field->getType()->isPointerType()) { 1020 S.Diag(Attr.getLoc(), diag::warn_transparent_union_nonpointer); 1021 return; 1022 } 1023 } 1024 1025 // FIXME: This is a complete hack; we should be properly propagating 1026 // transparent_union through Sema. That said, this is close enough to 1027 // correctly compile all the common cases of transparent_union without 1028 // errors or warnings 1029 QualType NewTy = S.Context.VoidPtrTy; 1030 NewTy.addConst(); 1031 TD->setUnderlyingType(NewTy); 1032} 1033 1034static void HandleAnnotateAttr(Decl *d, const AttributeList &Attr, Sema &S) { 1035 // check the attribute arguments. 1036 if (Attr.getNumArgs() != 1) { 1037 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1038 return; 1039 } 1040 Expr *argExpr = static_cast<Expr *>(Attr.getArg(0)); 1041 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 1042 1043 // Make sure that there is a string literal as the annotation's single 1044 // argument. 1045 if (!SE) { 1046 S.Diag(Attr.getLoc(), diag::err_attribute_annotate_no_string); 1047 return; 1048 } 1049 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 1050 SE->getByteLength()))); 1051} 1052 1053static void HandleAlignedAttr(Decl *d, const AttributeList &Attr, Sema &S) { 1054 // check the attribute arguments. 1055 if (Attr.getNumArgs() > 1) { 1056 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1057 return; 1058 } 1059 1060 unsigned Align = 0; 1061 if (Attr.getNumArgs() == 0) { 1062 // FIXME: This should be the target specific maximum alignment. 1063 // (For now we just use 128 bits which is the maximum on X86. 1064 Align = 128; 1065 return; 1066 } 1067 1068 Expr *alignmentExpr = static_cast<Expr *>(Attr.getArg(0)); 1069 llvm::APSInt Alignment(32); 1070 if (!alignmentExpr->isIntegerConstantExpr(Alignment, S.Context)) { 1071 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1072 << "aligned" << alignmentExpr->getSourceRange(); 1073 return; 1074 } 1075 d->addAttr(new AlignedAttr(Alignment.getZExtValue() * 8)); 1076} 1077 1078/// HandleModeAttr - This attribute modifies the width of a decl with 1079/// primitive type. 1080/// 1081/// Despite what would be logical, the mode attribute is a decl attribute, 1082/// not a type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make 1083/// 'G' be HImode, not an intermediate pointer. 1084/// 1085static void HandleModeAttr(Decl *D, const AttributeList &Attr, Sema &S) { 1086 // This attribute isn't documented, but glibc uses it. It changes 1087 // the width of an int or unsigned int to the specified size. 1088 1089 // Check that there aren't any arguments 1090 if (Attr.getNumArgs() != 0) { 1091 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1092 return; 1093 } 1094 1095 IdentifierInfo *Name = Attr.getParameterName(); 1096 if (!Name) { 1097 S.Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name); 1098 return; 1099 } 1100 const char *Str = Name->getName(); 1101 unsigned Len = Name->getLength(); 1102 1103 // Normalize the attribute name, __foo__ becomes foo. 1104 if (Len > 4 && Str[0] == '_' && Str[1] == '_' && 1105 Str[Len - 2] == '_' && Str[Len - 1] == '_') { 1106 Str += 2; 1107 Len -= 4; 1108 } 1109 1110 unsigned DestWidth = 0; 1111 bool IntegerMode = true; 1112 switch (Len) { 1113 case 2: 1114 if (!memcmp(Str, "QI", 2)) { DestWidth = 8; break; } 1115 if (!memcmp(Str, "HI", 2)) { DestWidth = 16; break; } 1116 if (!memcmp(Str, "SI", 2)) { DestWidth = 32; break; } 1117 if (!memcmp(Str, "DI", 2)) { DestWidth = 64; break; } 1118 if (!memcmp(Str, "TI", 2)) { DestWidth = 128; break; } 1119 if (!memcmp(Str, "SF", 2)) { DestWidth = 32; IntegerMode = false; break; } 1120 if (!memcmp(Str, "DF", 2)) { DestWidth = 64; IntegerMode = false; break; } 1121 if (!memcmp(Str, "XF", 2)) { DestWidth = 96; IntegerMode = false; break; } 1122 if (!memcmp(Str, "TF", 2)) { DestWidth = 128; IntegerMode = false; break; } 1123 break; 1124 case 4: 1125 // FIXME: glibc uses 'word' to define register_t; this is narrower than a 1126 // pointer on PIC16 and other embedded platforms. 1127 if (!memcmp(Str, "word", 4)) 1128 DestWidth = S.Context.Target.getPointerWidth(0); 1129 if (!memcmp(Str, "byte", 4)) 1130 DestWidth = S.Context.Target.getCharWidth(); 1131 break; 1132 case 7: 1133 if (!memcmp(Str, "pointer", 7)) 1134 DestWidth = S.Context.Target.getPointerWidth(0); 1135 break; 1136 } 1137 1138 QualType OldTy; 1139 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) 1140 OldTy = TD->getUnderlyingType(); 1141 else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) 1142 OldTy = VD->getType(); 1143 else { 1144 S.Diag(D->getLocation(), diag::err_attr_wrong_decl) 1145 << "mode" << SourceRange(Attr.getLoc(), Attr.getLoc()); 1146 return; 1147 } 1148 1149 // FIXME: Need proper fixed-width types 1150 QualType NewTy; 1151 switch (DestWidth) { 1152 case 0: 1153 S.Diag(Attr.getLoc(), diag::err_unknown_machine_mode) << Name; 1154 return; 1155 default: 1156 S.Diag(Attr.getLoc(), diag::err_unsupported_machine_mode) << Name; 1157 return; 1158 case 8: 1159 assert(IntegerMode); 1160 if (OldTy->isSignedIntegerType()) 1161 NewTy = S.Context.SignedCharTy; 1162 else 1163 NewTy = S.Context.UnsignedCharTy; 1164 break; 1165 case 16: 1166 assert(IntegerMode); 1167 if (OldTy->isSignedIntegerType()) 1168 NewTy = S.Context.ShortTy; 1169 else 1170 NewTy = S.Context.UnsignedShortTy; 1171 break; 1172 case 32: 1173 if (!IntegerMode) 1174 NewTy = S.Context.FloatTy; 1175 else if (OldTy->isSignedIntegerType()) 1176 NewTy = S.Context.IntTy; 1177 else 1178 NewTy = S.Context.UnsignedIntTy; 1179 break; 1180 case 64: 1181 if (!IntegerMode) 1182 NewTy = S.Context.DoubleTy; 1183 else if (OldTy->isSignedIntegerType()) 1184 NewTy = S.Context.LongLongTy; 1185 else 1186 NewTy = S.Context.UnsignedLongLongTy; 1187 break; 1188 } 1189 1190 if (!OldTy->getAsBuiltinType()) 1191 S.Diag(Attr.getLoc(), diag::err_mode_not_primitive); 1192 else if (!(IntegerMode && OldTy->isIntegerType()) && 1193 !(!IntegerMode && OldTy->isFloatingType())) { 1194 S.Diag(Attr.getLoc(), diag::err_mode_wrong_type); 1195 } 1196 1197 // Install the new type. 1198 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) 1199 TD->setUnderlyingType(NewTy); 1200 else 1201 cast<ValueDecl>(D)->setType(NewTy); 1202} 1203 1204//===----------------------------------------------------------------------===// 1205// Top Level Sema Entry Points 1206//===----------------------------------------------------------------------===// 1207 1208/// ProcessDeclAttribute - Apply the specific attribute to the specified decl if 1209/// the attribute applies to decls. If the attribute is a type attribute, just 1210/// silently ignore it. 1211static void ProcessDeclAttribute(Decl *D, const AttributeList &Attr, Sema &S) { 1212 switch (Attr.getKind()) { 1213 case AttributeList::AT_IBOutlet: HandleIBOutletAttr (D, Attr, S); break; 1214 case AttributeList::AT_address_space: 1215 // Ignore this, this is a type attribute, handled by ProcessTypeAttributes. 1216 break; 1217 case AttributeList::AT_alias: HandleAliasAttr (D, Attr, S); break; 1218 case AttributeList::AT_aligned: HandleAlignedAttr (D, Attr, S); break; 1219 case AttributeList::AT_always_inline: 1220 HandleAlwaysInlineAttr (D, Attr, S); break; 1221 case AttributeList::AT_annotate: HandleAnnotateAttr (D, Attr, S); break; 1222 case AttributeList::AT_constructor: HandleConstructorAttr(D, Attr, S); break; 1223 case AttributeList::AT_deprecated: HandleDeprecatedAttr(D, Attr, S); break; 1224 case AttributeList::AT_destructor: HandleDestructorAttr(D, Attr, S); break; 1225 case AttributeList::AT_dllexport: HandleDLLExportAttr (D, Attr, S); break; 1226 case AttributeList::AT_dllimport: HandleDLLImportAttr (D, Attr, S); break; 1227 case AttributeList::AT_ext_vector_type: 1228 HandleExtVectorTypeAttr(D, Attr, S); 1229 break; 1230 case AttributeList::AT_fastcall: HandleFastCallAttr (D, Attr, S); break; 1231 case AttributeList::AT_format: HandleFormatAttr (D, Attr, S); break; 1232 case AttributeList::AT_mode: HandleModeAttr (D, Attr, S); break; 1233 case AttributeList::AT_nonnull: HandleNonNullAttr (D, Attr, S); break; 1234 case AttributeList::AT_noreturn: HandleNoReturnAttr (D, Attr, S); break; 1235 case AttributeList::AT_nothrow: HandleNothrowAttr (D, Attr, S); break; 1236 case AttributeList::AT_packed: HandlePackedAttr (D, Attr, S); break; 1237 case AttributeList::AT_stdcall: HandleStdCallAttr (D, Attr, S); break; 1238 case AttributeList::AT_unavailable: HandleUnavailableAttr(D, Attr, S); break; 1239 case AttributeList::AT_unused: HandleUnusedAttr (D, Attr, S); break; 1240 case AttributeList::AT_vector_size: HandleVectorSizeAttr(D, Attr, S); break; 1241 case AttributeList::AT_visibility: HandleVisibilityAttr(D, Attr, S); break; 1242 case AttributeList::AT_weak: HandleWeakAttr (D, Attr, S); break; 1243 case AttributeList::AT_transparent_union: 1244 HandleTransparentUnionAttr(D, Attr, S); 1245 break; 1246 case AttributeList::AT_objc_gc: HandleObjCGCAttr (D, Attr, S); break; 1247 case AttributeList::AT_nsobject: HandleObjCNSObject (D, Attr, S); break; 1248 case AttributeList::AT_blocks: HandleBlocksAttr (D, Attr, S); break; 1249 case AttributeList::AT_sentinel: HandleSentinelAttr (D, Attr, S); break; 1250 case AttributeList::AT_const: HandleConstAttr (D, Attr, S); break; 1251 case AttributeList::AT_pure: HandlePureAttr (D, Attr, S); break; 1252 default: 1253#if 0 1254 // TODO: when we have the full set of attributes, warn about unknown ones. 1255 S.Diag(Attr->getLoc(), diag::warn_attribute_ignored) << Attr->getName(); 1256#endif 1257 break; 1258 } 1259} 1260 1261/// ProcessDeclAttributeList - Apply all the decl attributes in the specified 1262/// attribute list to the specified decl, ignoring any type attributes. 1263void Sema::ProcessDeclAttributeList(Decl *D, const AttributeList *AttrList) { 1264 while (AttrList) { 1265 ProcessDeclAttribute(D, *AttrList, *this); 1266 AttrList = AttrList->getNext(); 1267 } 1268} 1269 1270 1271/// ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in 1272/// it, apply them to D. This is a bit tricky because PD can have attributes 1273/// specified in many different places, and we need to find and apply them all. 1274void Sema::ProcessDeclAttributes(Decl *D, const Declarator &PD) { 1275 // Apply decl attributes from the DeclSpec if present. 1276 if (const AttributeList *Attrs = PD.getDeclSpec().getAttributes()) 1277 ProcessDeclAttributeList(D, Attrs); 1278 1279 // Walk the declarator structure, applying decl attributes that were in a type 1280 // position to the decl itself. This handles cases like: 1281 // int *__attr__(x)** D; 1282 // when X is a decl attribute. 1283 for (unsigned i = 0, e = PD.getNumTypeObjects(); i != e; ++i) 1284 if (const AttributeList *Attrs = PD.getTypeObject(i).getAttrs()) 1285 ProcessDeclAttributeList(D, Attrs); 1286 1287 // Finally, apply any attributes on the decl itself. 1288 if (const AttributeList *Attrs = PD.getAttributes()) 1289 ProcessDeclAttributeList(D, Attrs); 1290} 1291 1292