Chris Lattner | 6b6b537 | 2008-06-26 18:38:35 +0000 | [diff] [blame] | 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" |
Chris Lattner | fbf1347 | 2008-06-27 22:18:37 +0000 | [diff] [blame^] | 16 | #include "clang/Basic/TargetInfo.h" |
Chris Lattner | 6b6b537 | 2008-06-26 18:38:35 +0000 | [diff] [blame] | 17 | using namespace clang; |
| 18 | |
| 19 | static const FunctionTypeProto *getFunctionProto(Decl *d) { |
| 20 | QualType Ty; |
| 21 | |
| 22 | if (ValueDecl *decl = dyn_cast<ValueDecl>(d)) |
| 23 | Ty = decl->getType(); |
| 24 | else if (FieldDecl *decl = dyn_cast<FieldDecl>(d)) |
| 25 | Ty = decl->getType(); |
| 26 | else if (TypedefDecl* decl = dyn_cast<TypedefDecl>(d)) |
| 27 | Ty = decl->getUnderlyingType(); |
| 28 | else |
| 29 | return 0; |
| 30 | |
| 31 | if (Ty->isFunctionPointerType()) |
| 32 | Ty = Ty->getAsPointerType()->getPointeeType(); |
| 33 | |
| 34 | if (const FunctionType *FnTy = Ty->getAsFunctionType()) |
| 35 | return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static inline bool isNSStringType(QualType T, ASTContext &Ctx) { |
| 41 | if (!T->isPointerType()) |
| 42 | return false; |
| 43 | |
| 44 | T = T->getAsPointerType()->getPointeeType().getCanonicalType(); |
| 45 | ObjCInterfaceType* ClsT = dyn_cast<ObjCInterfaceType>(T.getTypePtr()); |
| 46 | |
| 47 | if (!ClsT) |
| 48 | return false; |
| 49 | |
| 50 | IdentifierInfo* ClsName = ClsT->getDecl()->getIdentifier(); |
| 51 | |
| 52 | // FIXME: Should we walk the chain of classes? |
| 53 | return ClsName == &Ctx.Idents.get("NSString") || |
| 54 | ClsName == &Ctx.Idents.get("NSMutableString"); |
| 55 | } |
| 56 | |
| 57 | void Sema::HandleDeclAttribute(Decl *New, const AttributeList *Attr) { |
| 58 | |
| 59 | switch (Attr->getKind()) { |
| 60 | case AttributeList::AT_vector_size: |
| 61 | if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { |
| 62 | QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); |
| 63 | if (!newType.isNull()) // install the new vector type into the decl |
| 64 | vDecl->setType(newType); |
| 65 | } |
| 66 | if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { |
| 67 | QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), |
| 68 | Attr); |
| 69 | if (!newType.isNull()) // install the new vector type into the decl |
| 70 | tDecl->setUnderlyingType(newType); |
| 71 | } |
| 72 | break; |
| 73 | case AttributeList::AT_ext_vector_type: |
| 74 | if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) |
| 75 | HandleExtVectorTypeAttribute(tDecl, Attr); |
| 76 | else |
| 77 | Diag(Attr->getLoc(), |
| 78 | diag::err_typecheck_ext_vector_not_typedef); |
| 79 | break; |
| 80 | case AttributeList::AT_address_space: |
| 81 | // Ignore this, this is a type attribute, handled by ProcessTypeAttributes. |
| 82 | break; |
Chris Lattner | fbf1347 | 2008-06-27 22:18:37 +0000 | [diff] [blame^] | 83 | case AttributeList::AT_mode: HandleModeAttribute(New, *Attr); break; |
Chris Lattner | 6b6b537 | 2008-06-26 18:38:35 +0000 | [diff] [blame] | 84 | case AttributeList::AT_alias: HandleAliasAttribute(New, Attr); break; |
| 85 | case AttributeList::AT_deprecated: HandleDeprecatedAttribute(New, Attr);break; |
| 86 | case AttributeList::AT_visibility: HandleVisibilityAttribute(New, Attr);break; |
| 87 | case AttributeList::AT_weak: HandleWeakAttribute(New, Attr); break; |
| 88 | case AttributeList::AT_dllimport: HandleDLLImportAttribute(New, Attr); break; |
| 89 | case AttributeList::AT_dllexport: HandleDLLExportAttribute(New, Attr); break; |
| 90 | case AttributeList::AT_nothrow: HandleNothrowAttribute(New, Attr); break; |
| 91 | case AttributeList::AT_stdcall: HandleStdCallAttribute(New, Attr); break; |
| 92 | case AttributeList::AT_fastcall: HandleFastCallAttribute(New, Attr); break; |
| 93 | case AttributeList::AT_aligned: HandleAlignedAttribute(New, Attr); break; |
| 94 | case AttributeList::AT_packed: HandlePackedAttribute(New, Attr); break; |
| 95 | case AttributeList::AT_annotate: HandleAnnotateAttribute(New, Attr); break; |
| 96 | case AttributeList::AT_noreturn: HandleNoReturnAttribute(New, Attr); break; |
| 97 | case AttributeList::AT_format: HandleFormatAttribute(New, Attr); break; |
| 98 | case AttributeList::AT_transparent_union: |
| 99 | HandleTransparentUnionAttribute(New, Attr); |
| 100 | break; |
| 101 | default: |
| 102 | #if 0 |
| 103 | // TODO: when we have the full set of attributes, warn about unknown ones. |
| 104 | Diag(Attr->getLoc(), diag::warn_attribute_ignored, |
| 105 | Attr->getName()->getName()); |
| 106 | #endif |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | void Sema::HandleDeclAttributes(Decl *New, const AttributeList *DeclSpecAttrs, |
| 112 | const AttributeList *DeclaratorAttrs) { |
| 113 | if (DeclSpecAttrs == 0 && DeclaratorAttrs == 0) return; |
| 114 | |
| 115 | while (DeclSpecAttrs) { |
| 116 | HandleDeclAttribute(New, DeclSpecAttrs); |
| 117 | DeclSpecAttrs = DeclSpecAttrs->getNext(); |
| 118 | } |
| 119 | |
| 120 | // If there are any type attributes that were in the declarator, apply them to |
| 121 | // its top level type. |
| 122 | if (ValueDecl *VD = dyn_cast<ValueDecl>(New)) { |
| 123 | QualType DT = VD->getType(); |
| 124 | ProcessTypeAttributes(DT, DeclaratorAttrs); |
| 125 | VD->setType(DT); |
| 126 | } else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(New)) { |
| 127 | QualType DT = TD->getUnderlyingType(); |
| 128 | ProcessTypeAttributes(DT, DeclaratorAttrs); |
| 129 | TD->setUnderlyingType(DT); |
| 130 | } |
| 131 | |
| 132 | while (DeclaratorAttrs) { |
| 133 | HandleDeclAttribute(New, DeclaratorAttrs); |
| 134 | DeclaratorAttrs = DeclaratorAttrs->getNext(); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | void Sema::HandleExtVectorTypeAttribute(TypedefDecl *tDecl, |
| 139 | const AttributeList *rawAttr) { |
| 140 | QualType curType = tDecl->getUnderlyingType(); |
| 141 | // check the attribute arguments. |
| 142 | if (rawAttr->getNumArgs() != 1) { |
| 143 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 144 | std::string("1")); |
| 145 | return; |
| 146 | } |
| 147 | Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); |
| 148 | llvm::APSInt vecSize(32); |
| 149 | if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { |
| 150 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, |
| 151 | "ext_vector_type", sizeExpr->getSourceRange()); |
| 152 | return; |
| 153 | } |
| 154 | // unlike gcc's vector_size attribute, we do not allow vectors to be defined |
| 155 | // in conjunction with complex types (pointers, arrays, functions, etc.). |
| 156 | Type *canonType = curType.getCanonicalType().getTypePtr(); |
| 157 | if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { |
| 158 | Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, |
| 159 | curType.getCanonicalType().getAsString()); |
| 160 | return; |
| 161 | } |
| 162 | // unlike gcc's vector_size attribute, the size is specified as the |
| 163 | // number of elements, not the number of bytes. |
| 164 | unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); |
| 165 | |
| 166 | if (vectorSize == 0) { |
| 167 | Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, |
| 168 | sizeExpr->getSourceRange()); |
| 169 | return; |
| 170 | } |
| 171 | // Instantiate/Install the vector type, the number of elements is > 0. |
| 172 | tDecl->setUnderlyingType(Context.getExtVectorType(curType, vectorSize)); |
| 173 | // Remember this typedef decl, we will need it later for diagnostics. |
| 174 | ExtVectorDecls.push_back(tDecl); |
| 175 | } |
| 176 | |
| 177 | QualType Sema::HandleVectorTypeAttribute(QualType curType, |
| 178 | const AttributeList *rawAttr) { |
| 179 | // check the attribute arugments. |
| 180 | if (rawAttr->getNumArgs() != 1) { |
| 181 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 182 | std::string("1")); |
| 183 | return QualType(); |
| 184 | } |
| 185 | Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); |
| 186 | llvm::APSInt vecSize(32); |
| 187 | if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { |
| 188 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, |
| 189 | "vector_size", sizeExpr->getSourceRange()); |
| 190 | return QualType(); |
| 191 | } |
| 192 | // navigate to the base type - we need to provide for vector pointers, |
| 193 | // vector arrays, and functions returning vectors. |
| 194 | Type *canonType = curType.getCanonicalType().getTypePtr(); |
| 195 | |
| 196 | if (canonType->isPointerType() || canonType->isArrayType() || |
| 197 | canonType->isFunctionType()) { |
| 198 | assert(0 && "HandleVector(): Complex type construction unimplemented"); |
| 199 | /* FIXME: rebuild the type from the inside out, vectorizing the inner type. |
| 200 | do { |
| 201 | if (PointerType *PT = dyn_cast<PointerType>(canonType)) |
| 202 | canonType = PT->getPointeeType().getTypePtr(); |
| 203 | else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) |
| 204 | canonType = AT->getElementType().getTypePtr(); |
| 205 | else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) |
| 206 | canonType = FT->getResultType().getTypePtr(); |
| 207 | } while (canonType->isPointerType() || canonType->isArrayType() || |
| 208 | canonType->isFunctionType()); |
| 209 | */ |
| 210 | } |
| 211 | // the base type must be integer or float. |
| 212 | if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { |
| 213 | Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, |
| 214 | curType.getCanonicalType().getAsString()); |
| 215 | return QualType(); |
| 216 | } |
| 217 | unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); |
| 218 | // vecSize is specified in bytes - convert to bits. |
| 219 | unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); |
| 220 | |
| 221 | // the vector size needs to be an integral multiple of the type size. |
| 222 | if (vectorSize % typeSize) { |
| 223 | Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, |
| 224 | sizeExpr->getSourceRange()); |
| 225 | return QualType(); |
| 226 | } |
| 227 | if (vectorSize == 0) { |
| 228 | Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, |
| 229 | sizeExpr->getSourceRange()); |
| 230 | return QualType(); |
| 231 | } |
| 232 | // Instantiate the vector type, the number of elements is > 0, and not |
| 233 | // required to be a power of 2, unlike GCC. |
| 234 | return Context.getVectorType(curType, vectorSize/typeSize); |
| 235 | } |
| 236 | |
| 237 | void Sema::HandlePackedAttribute(Decl *d, const AttributeList *rawAttr) { |
| 238 | // check the attribute arguments. |
| 239 | if (rawAttr->getNumArgs() > 0) { |
| 240 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 241 | std::string("0")); |
| 242 | return; |
| 243 | } |
| 244 | |
| 245 | if (TagDecl *TD = dyn_cast<TagDecl>(d)) |
| 246 | TD->addAttr(new PackedAttr); |
| 247 | else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { |
| 248 | // If the alignment is less than or equal to 8 bits, the packed attribute |
| 249 | // has no effect. |
| 250 | if (!FD->getType()->isIncompleteType() && |
| 251 | Context.getTypeAlign(FD->getType()) <= 8) |
| 252 | Diag(rawAttr->getLoc(), |
| 253 | diag::warn_attribute_ignored_for_field_of_type, |
| 254 | rawAttr->getName()->getName(), FD->getType().getAsString()); |
| 255 | else |
| 256 | FD->addAttr(new PackedAttr); |
| 257 | } else |
| 258 | Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, |
| 259 | rawAttr->getName()->getName()); |
| 260 | } |
| 261 | |
| 262 | void Sema::HandleAliasAttribute(Decl *d, const AttributeList *rawAttr) { |
| 263 | // check the attribute arguments. |
| 264 | if (rawAttr->getNumArgs() != 1) { |
| 265 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 266 | std::string("1")); |
| 267 | return; |
| 268 | } |
| 269 | |
| 270 | Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); |
| 271 | Arg = Arg->IgnoreParenCasts(); |
| 272 | StringLiteral *Str = dyn_cast<StringLiteral>(Arg); |
| 273 | |
| 274 | if (Str == 0 || Str->isWide()) { |
| 275 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, |
| 276 | "alias", std::string("1")); |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | const char *Alias = Str->getStrData(); |
| 281 | unsigned AliasLen = Str->getByteLength(); |
| 282 | |
| 283 | // FIXME: check if target symbol exists in current file |
| 284 | |
| 285 | d->addAttr(new AliasAttr(std::string(Alias, AliasLen))); |
| 286 | } |
| 287 | |
| 288 | void Sema::HandleNoReturnAttribute(Decl *d, const AttributeList *rawAttr) { |
| 289 | // check the attribute arguments. |
| 290 | if (rawAttr->getNumArgs() != 0) { |
| 291 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 292 | std::string("0")); |
| 293 | return; |
| 294 | } |
| 295 | |
| 296 | FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); |
| 297 | |
| 298 | if (!Fn) { |
| 299 | Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, |
| 300 | "noreturn", "function"); |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | d->addAttr(new NoReturnAttr()); |
| 305 | } |
| 306 | |
| 307 | void Sema::HandleDeprecatedAttribute(Decl *d, const AttributeList *rawAttr) { |
| 308 | // check the attribute arguments. |
| 309 | if (rawAttr->getNumArgs() != 0) { |
| 310 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 311 | std::string("0")); |
| 312 | return; |
| 313 | } |
| 314 | |
| 315 | d->addAttr(new DeprecatedAttr()); |
| 316 | } |
| 317 | |
| 318 | void Sema::HandleVisibilityAttribute(Decl *d, const AttributeList *rawAttr) { |
| 319 | // check the attribute arguments. |
| 320 | if (rawAttr->getNumArgs() != 1) { |
| 321 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 322 | std::string("1")); |
| 323 | return; |
| 324 | } |
| 325 | |
| 326 | Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); |
| 327 | Arg = Arg->IgnoreParenCasts(); |
| 328 | StringLiteral *Str = dyn_cast<StringLiteral>(Arg); |
| 329 | |
| 330 | if (Str == 0 || Str->isWide()) { |
| 331 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, |
| 332 | "visibility", std::string("1")); |
| 333 | return; |
| 334 | } |
| 335 | |
| 336 | const char *TypeStr = Str->getStrData(); |
| 337 | unsigned TypeLen = Str->getByteLength(); |
| 338 | VisibilityAttr::VisibilityTypes type; |
| 339 | |
| 340 | if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) |
| 341 | type = VisibilityAttr::DefaultVisibility; |
| 342 | else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) |
| 343 | type = VisibilityAttr::HiddenVisibility; |
| 344 | else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) |
| 345 | type = VisibilityAttr::HiddenVisibility; // FIXME |
| 346 | else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) |
| 347 | type = VisibilityAttr::ProtectedVisibility; |
| 348 | else { |
| 349 | Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, |
| 350 | "visibility", TypeStr); |
| 351 | return; |
| 352 | } |
| 353 | |
| 354 | d->addAttr(new VisibilityAttr(type)); |
| 355 | } |
| 356 | |
| 357 | void Sema::HandleWeakAttribute(Decl *d, const AttributeList *rawAttr) { |
| 358 | // check the attribute arguments. |
| 359 | if (rawAttr->getNumArgs() != 0) { |
| 360 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 361 | std::string("0")); |
| 362 | return; |
| 363 | } |
| 364 | |
| 365 | d->addAttr(new WeakAttr()); |
| 366 | } |
| 367 | |
| 368 | void Sema::HandleDLLImportAttribute(Decl *d, const AttributeList *rawAttr) { |
| 369 | // check the attribute arguments. |
| 370 | if (rawAttr->getNumArgs() != 0) { |
| 371 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 372 | std::string("0")); |
| 373 | return; |
| 374 | } |
| 375 | |
| 376 | d->addAttr(new DLLImportAttr()); |
| 377 | } |
| 378 | |
| 379 | void Sema::HandleDLLExportAttribute(Decl *d, const AttributeList *rawAttr) { |
| 380 | // check the attribute arguments. |
| 381 | if (rawAttr->getNumArgs() != 0) { |
| 382 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 383 | std::string("0")); |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | d->addAttr(new DLLExportAttr()); |
| 388 | } |
| 389 | |
| 390 | void Sema::HandleStdCallAttribute(Decl *d, const AttributeList *rawAttr) { |
| 391 | // check the attribute arguments. |
| 392 | if (rawAttr->getNumArgs() != 0) { |
| 393 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 394 | std::string("0")); |
| 395 | return; |
| 396 | } |
| 397 | |
| 398 | d->addAttr(new StdCallAttr()); |
| 399 | } |
| 400 | |
| 401 | void Sema::HandleFastCallAttribute(Decl *d, const AttributeList *rawAttr) { |
| 402 | // check the attribute arguments. |
| 403 | if (rawAttr->getNumArgs() != 0) { |
| 404 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 405 | std::string("0")); |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | d->addAttr(new FastCallAttr()); |
| 410 | } |
| 411 | |
| 412 | void Sema::HandleNothrowAttribute(Decl *d, const AttributeList *rawAttr) { |
| 413 | // check the attribute arguments. |
| 414 | if (rawAttr->getNumArgs() != 0) { |
| 415 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 416 | std::string("0")); |
| 417 | return; |
| 418 | } |
| 419 | |
| 420 | d->addAttr(new NoThrowAttr()); |
| 421 | } |
| 422 | |
| 423 | /// Handle __attribute__((format(type,idx,firstarg))) attributes |
| 424 | /// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html |
| 425 | void Sema::HandleFormatAttribute(Decl *d, const AttributeList *rawAttr) { |
| 426 | |
| 427 | if (!rawAttr->getParameterName()) { |
| 428 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, |
| 429 | "format", std::string("1")); |
| 430 | return; |
| 431 | } |
| 432 | |
| 433 | if (rawAttr->getNumArgs() != 2) { |
| 434 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 435 | std::string("3")); |
| 436 | return; |
| 437 | } |
| 438 | |
| 439 | // GCC ignores the format attribute on K&R style function |
| 440 | // prototypes, so we ignore it as well |
| 441 | const FunctionTypeProto *proto = getFunctionProto(d); |
| 442 | |
| 443 | if (!proto) { |
| 444 | Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, |
| 445 | "format", "function"); |
| 446 | return; |
| 447 | } |
| 448 | |
| 449 | // FIXME: in C++ the implicit 'this' function parameter also counts. |
| 450 | // this is needed in order to be compatible with GCC |
| 451 | // the index must start in 1 and the limit is numargs+1 |
| 452 | unsigned NumArgs = proto->getNumArgs(); |
| 453 | unsigned FirstIdx = 1; |
| 454 | |
| 455 | const char *Format = rawAttr->getParameterName()->getName(); |
| 456 | unsigned FormatLen = rawAttr->getParameterName()->getLength(); |
| 457 | |
| 458 | // Normalize the argument, __foo__ becomes foo. |
| 459 | if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && |
| 460 | Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { |
| 461 | Format += 2; |
| 462 | FormatLen -= 4; |
| 463 | } |
| 464 | |
| 465 | bool Supported = false; |
| 466 | bool is_NSString = false; |
| 467 | bool is_strftime = false; |
| 468 | |
| 469 | switch (FormatLen) { |
| 470 | default: break; |
| 471 | case 5: |
| 472 | Supported = !memcmp(Format, "scanf", 5); |
| 473 | break; |
| 474 | case 6: |
| 475 | Supported = !memcmp(Format, "printf", 6); |
| 476 | break; |
| 477 | case 7: |
| 478 | Supported = !memcmp(Format, "strfmon", 7); |
| 479 | break; |
| 480 | case 8: |
| 481 | Supported = (is_strftime = !memcmp(Format, "strftime", 8)) || |
| 482 | (is_NSString = !memcmp(Format, "NSString", 8)); |
| 483 | break; |
| 484 | } |
| 485 | |
| 486 | if (!Supported) { |
| 487 | Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, |
| 488 | "format", rawAttr->getParameterName()->getName()); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | // checks for the 2nd argument |
| 493 | Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); |
| 494 | llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); |
| 495 | if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { |
| 496 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, |
| 497 | "format", std::string("2"), IdxExpr->getSourceRange()); |
| 498 | return; |
| 499 | } |
| 500 | |
| 501 | if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { |
| 502 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, |
| 503 | "format", std::string("2"), IdxExpr->getSourceRange()); |
| 504 | return; |
| 505 | } |
| 506 | |
| 507 | // FIXME: Do we need to bounds check? |
| 508 | unsigned ArgIdx = Idx.getZExtValue() - 1; |
| 509 | |
| 510 | // make sure the format string is really a string |
| 511 | QualType Ty = proto->getArgType(ArgIdx); |
| 512 | |
| 513 | if (is_NSString) { |
| 514 | // FIXME: do we need to check if the type is NSString*? What are |
| 515 | // the semantics? |
| 516 | if (!isNSStringType(Ty, Context)) { |
| 517 | // FIXME: Should highlight the actual expression that has the |
| 518 | // wrong type. |
| 519 | Diag(rawAttr->getLoc(), diag::err_format_attribute_not_NSString, |
| 520 | IdxExpr->getSourceRange()); |
| 521 | return; |
| 522 | } |
| 523 | } else if (!Ty->isPointerType() || |
| 524 | !Ty->getAsPointerType()->getPointeeType()->isCharType()) { |
| 525 | // FIXME: Should highlight the actual expression that has the |
| 526 | // wrong type. |
| 527 | Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, |
| 528 | IdxExpr->getSourceRange()); |
| 529 | return; |
| 530 | } |
| 531 | |
| 532 | // check the 3rd argument |
| 533 | Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); |
| 534 | llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); |
| 535 | if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { |
| 536 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, |
| 537 | "format", std::string("3"), FirstArgExpr->getSourceRange()); |
| 538 | return; |
| 539 | } |
| 540 | |
| 541 | // check if the function is variadic if the 3rd argument non-zero |
| 542 | if (FirstArg != 0) { |
| 543 | if (proto->isVariadic()) { |
| 544 | ++NumArgs; // +1 for ... |
| 545 | } else { |
| 546 | Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); |
| 547 | return; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | // strftime requires FirstArg to be 0 because it doesn't read from any variable |
| 552 | // the input is just the current time + the format string |
| 553 | if (is_strftime) { |
| 554 | if (FirstArg != 0) { |
| 555 | Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, |
| 556 | FirstArgExpr->getSourceRange()); |
| 557 | return; |
| 558 | } |
| 559 | // if 0 it disables parameter checking (to use with e.g. va_list) |
| 560 | } else if (FirstArg != 0 && FirstArg != NumArgs) { |
| 561 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, |
| 562 | "format", std::string("3"), FirstArgExpr->getSourceRange()); |
| 563 | return; |
| 564 | } |
| 565 | |
| 566 | d->addAttr(new FormatAttr(std::string(Format, FormatLen), |
| 567 | Idx.getZExtValue(), FirstArg.getZExtValue())); |
| 568 | } |
| 569 | |
| 570 | void Sema::HandleTransparentUnionAttribute(Decl *d, |
| 571 | const AttributeList *rawAttr) { |
| 572 | // check the attribute arguments. |
| 573 | if (rawAttr->getNumArgs() != 0) { |
| 574 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 575 | std::string("0")); |
| 576 | return; |
| 577 | } |
| 578 | |
| 579 | TypeDecl *decl = dyn_cast<TypeDecl>(d); |
| 580 | |
| 581 | if (!decl || !Context.getTypeDeclType(decl)->isUnionType()) { |
| 582 | Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, |
| 583 | "transparent_union", "union"); |
| 584 | return; |
| 585 | } |
| 586 | |
| 587 | //QualType QTy = Context.getTypeDeclType(decl); |
| 588 | //const RecordType *Ty = QTy->getAsUnionType(); |
| 589 | |
| 590 | // FIXME |
| 591 | // Ty->addAttr(new TransparentUnionAttr()); |
| 592 | } |
| 593 | |
| 594 | void Sema::HandleAnnotateAttribute(Decl *d, const AttributeList *rawAttr) { |
| 595 | // check the attribute arguments. |
| 596 | if (rawAttr->getNumArgs() != 1) { |
| 597 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 598 | std::string("1")); |
| 599 | return; |
| 600 | } |
| 601 | Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); |
| 602 | StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); |
| 603 | |
| 604 | // Make sure that there is a string literal as the annotation's single |
| 605 | // argument. |
| 606 | if (!SE) { |
| 607 | Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); |
| 608 | return; |
| 609 | } |
| 610 | d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), |
| 611 | SE->getByteLength()))); |
| 612 | } |
| 613 | |
| 614 | void Sema::HandleAlignedAttribute(Decl *d, const AttributeList *rawAttr) { |
| 615 | // check the attribute arguments. |
| 616 | if (rawAttr->getNumArgs() > 1) { |
| 617 | Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, |
| 618 | std::string("1")); |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | unsigned Align = 0; |
| 623 | |
| 624 | if (rawAttr->getNumArgs() == 0) { |
| 625 | // FIXME: This should be the target specific maximum alignment. |
| 626 | // (For now we just use 128 bits which is the maximum on X86. |
| 627 | Align = 128; |
| 628 | return; |
| 629 | } else { |
| 630 | Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); |
| 631 | llvm::APSInt alignment(32); |
| 632 | if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { |
| 633 | Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, |
| 634 | "aligned", alignmentExpr->getSourceRange()); |
| 635 | return; |
| 636 | } |
| 637 | |
| 638 | Align = alignment.getZExtValue() * 8; |
| 639 | } |
| 640 | |
| 641 | d->addAttr(new AlignedAttr(Align)); |
| 642 | } |
Chris Lattner | fbf1347 | 2008-06-27 22:18:37 +0000 | [diff] [blame^] | 643 | |
| 644 | /// HandleModeAttribute - Process a mode attribute on the specified decl. |
| 645 | /// |
| 646 | /// Despite what would be logical, the mode attribute is a decl attribute, |
| 647 | /// not a type attribute: 'int ** __attribute((mode(HI))) *G;' tries to make |
| 648 | /// 'G' be HImode, not an intermediate pointer. |
| 649 | /// |
| 650 | void Sema::HandleModeAttribute(Decl *D, const AttributeList &Attr) { |
| 651 | // This attribute isn't documented, but glibc uses it. It changes |
| 652 | // the width of an int or unsigned int to the specified size. |
| 653 | |
| 654 | // Check that there aren't any arguments |
| 655 | if (Attr.getNumArgs() != 0) { |
| 656 | Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments, |
| 657 | std::string("0")); |
| 658 | return; |
| 659 | } |
| 660 | |
| 661 | IdentifierInfo *Name = Attr.getParameterName(); |
| 662 | if (!Name) { |
| 663 | Diag(Attr.getLoc(), diag::err_attribute_missing_parameter_name); |
| 664 | return; |
| 665 | } |
| 666 | const char *Str = Name->getName(); |
| 667 | unsigned Len = Name->getLength(); |
| 668 | |
| 669 | // Normalize the attribute name, __foo__ becomes foo. |
| 670 | if (Len > 4 && Str[0] == '_' && Str[1] == '_' && |
| 671 | Str[Len - 2] == '_' && Str[Len - 1] == '_') { |
| 672 | Str += 2; |
| 673 | Len -= 4; |
| 674 | } |
| 675 | |
| 676 | unsigned DestWidth = 0; |
| 677 | bool IntegerMode = true; |
| 678 | switch (Len) { |
| 679 | case 2: |
| 680 | if (!memcmp(Str, "QI", 2)) { DestWidth = 8; break; } |
| 681 | if (!memcmp(Str, "HI", 2)) { DestWidth = 16; break; } |
| 682 | if (!memcmp(Str, "SI", 2)) { DestWidth = 32; break; } |
| 683 | if (!memcmp(Str, "DI", 2)) { DestWidth = 64; break; } |
| 684 | if (!memcmp(Str, "TI", 2)) { DestWidth = 128; break; } |
| 685 | if (!memcmp(Str, "SF", 2)) { DestWidth = 32; IntegerMode = false; break; } |
| 686 | if (!memcmp(Str, "DF", 2)) { DestWidth = 64; IntegerMode = false; break; } |
| 687 | if (!memcmp(Str, "XF", 2)) { DestWidth = 96; IntegerMode = false; break; } |
| 688 | if (!memcmp(Str, "TF", 2)) { DestWidth = 128; IntegerMode = false; break; } |
| 689 | break; |
| 690 | case 4: |
| 691 | // FIXME: glibc uses 'word' to define register_t; this is narrower than a |
| 692 | // pointer on PIC16 and other embedded platforms. |
| 693 | if (!memcmp(Str, "word", 4)) |
| 694 | DestWidth = Context.Target.getPointerWidth(0); |
| 695 | if (!memcmp(Str, "byte", 4)) |
| 696 | DestWidth = Context.Target.getCharWidth(); |
| 697 | break; |
| 698 | case 7: |
| 699 | if (!memcmp(Str, "pointer", 7)) |
| 700 | DestWidth = Context.Target.getPointerWidth(0); |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | QualType OldTy; |
| 705 | if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) |
| 706 | OldTy = TD->getUnderlyingType(); |
| 707 | else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) |
| 708 | OldTy = VD->getType(); |
| 709 | else { |
| 710 | Diag(D->getLocation(), diag::err_mode_wrong_decl, |
| 711 | SourceRange(Attr.getLoc(), Attr.getLoc())); |
| 712 | return; |
| 713 | } |
| 714 | |
| 715 | // FIXME: Need proper fixed-width types |
| 716 | QualType NewTy; |
| 717 | switch (DestWidth) { |
| 718 | case 0: |
| 719 | Diag(Attr.getLoc(), diag::err_unknown_machine_mode, Name->getName()); |
| 720 | return; |
| 721 | default: |
| 722 | Diag(Attr.getLoc(), diag::err_unsupported_machine_mode, Name->getName()); |
| 723 | return; |
| 724 | case 8: |
| 725 | assert(IntegerMode); |
| 726 | if (OldTy->isSignedIntegerType()) |
| 727 | NewTy = Context.SignedCharTy; |
| 728 | else |
| 729 | NewTy = Context.UnsignedCharTy; |
| 730 | break; |
| 731 | case 16: |
| 732 | assert(IntegerMode); |
| 733 | if (OldTy->isSignedIntegerType()) |
| 734 | NewTy = Context.ShortTy; |
| 735 | else |
| 736 | NewTy = Context.UnsignedShortTy; |
| 737 | break; |
| 738 | case 32: |
| 739 | if (!IntegerMode) |
| 740 | NewTy = Context.FloatTy; |
| 741 | else if (OldTy->isSignedIntegerType()) |
| 742 | NewTy = Context.IntTy; |
| 743 | else |
| 744 | NewTy = Context.UnsignedIntTy; |
| 745 | break; |
| 746 | case 64: |
| 747 | if (!IntegerMode) |
| 748 | NewTy = Context.DoubleTy; |
| 749 | else if (OldTy->isSignedIntegerType()) |
| 750 | NewTy = Context.LongLongTy; |
| 751 | else |
| 752 | NewTy = Context.UnsignedLongLongTy; |
| 753 | break; |
| 754 | } |
| 755 | |
| 756 | if (!OldTy->getAsBuiltinType()) |
| 757 | Diag(Attr.getLoc(), diag::err_mode_not_primitive); |
| 758 | else if (!(IntegerMode && OldTy->isIntegerType()) && |
| 759 | !(!IntegerMode && OldTy->isFloatingType())) { |
| 760 | Diag(Attr.getLoc(), diag::err_mode_wrong_type); |
| 761 | } |
| 762 | |
| 763 | // Install the new type. |
| 764 | if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) |
| 765 | TD->setUnderlyingType(NewTy); |
| 766 | else |
| 767 | cast<ValueDecl>(D)->setType(NewTy); |
| 768 | } |