SemaDecl.cpp revision ef177820100ab583b08fd3056e2a5a52ee4b1629
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 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 semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/Attr.h" 18#include "clang/AST/Builtins.h" 19#include "clang/AST/Decl.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/Type.h" 22#include "clang/Parse/DeclSpec.h" 23#include "clang/Parse/Scope.h" 24#include "clang/Basic/LangOptions.h" 25#include "clang/Basic/TargetInfo.h" 26#include "clang/Basic/SourceManager.h" 27// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 28#include "clang/Lex/Preprocessor.h" 29#include "clang/Lex/HeaderSearch.h" 30#include "llvm/ADT/SmallString.h" 31#include "llvm/ADT/SmallSet.h" 32#include "llvm/ADT/DenseSet.h" 33using namespace clang; 34 35Sema::DeclTy *Sema::isTypeName(const IdentifierInfo &II, Scope *S) { 36 Decl *IIDecl = LookupDecl(&II, Decl::IDNS_Ordinary, S, false); 37 38 if (IIDecl && (isa<TypedefDecl>(IIDecl) || 39 isa<ObjCInterfaceDecl>(IIDecl) || 40 isa<TagDecl>(IIDecl))) 41 return IIDecl; 42 return 0; 43} 44 45void Sema::PushDeclContext(DeclContext *CD) { 46 assert( ( (CD->isFunctionOrMethod() && isa<TranslationUnitDecl>(CurContext)) 47 || CD->getParent() == CurContext ) && 48 "The next DeclContext should be directly contained in the current one."); 49 CurContext = CD; 50} 51 52void Sema::PopDeclContext() { 53 assert(CurContext && "DeclContext imbalance!"); 54 // If CurContext is a ObjC method, getParent() will return NULL. 55 CurContext = CurContext->isFunctionOrMethod() 56 ? Context.getTranslationUnitDecl() 57 : CurContext->getParent(); 58} 59 60/// Add this decl to the scope shadowed decl chains. 61void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 62 IdResolver.AddDecl(D, S); 63 S->AddDecl(D); 64} 65 66void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 67 if (S->decl_empty()) return; 68 assert((S->getFlags() & Scope::DeclScope) &&"Scope shouldn't contain decls!"); 69 70 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 71 I != E; ++I) { 72 Decl *TmpD = static_cast<Decl*>(*I); 73 assert(TmpD && "This decl didn't get pushed??"); 74 ScopedDecl *D = dyn_cast<ScopedDecl>(TmpD); 75 assert(D && "This decl isn't a ScopedDecl?"); 76 77 IdentifierInfo *II = D->getIdentifier(); 78 if (!II) continue; 79 80 // Unlink this decl from the identifier. 81 IdResolver.RemoveDecl(D); 82 83 // This will have to be revisited for C++: there we want to nest stuff in 84 // namespace decls etc. Even for C, we might want a top-level translation 85 // unit decl or something. 86 if (!CurFunctionDecl) 87 continue; 88 89 // Chain this decl to the containing function, it now owns the memory for 90 // the decl. 91 D->setNext(CurFunctionDecl->getDeclChain()); 92 CurFunctionDecl->setDeclChain(D); 93 } 94} 95 96/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 97/// return 0 if one not found. 98ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 99 // The third "scope" argument is 0 since we aren't enabling lazy built-in 100 // creation from this context. 101 Decl *IDecl = LookupDecl(Id, Decl::IDNS_Ordinary, 0, false); 102 103 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 104} 105 106/// LookupDecl - Look up the inner-most declaration in the specified 107/// namespace. 108Decl *Sema::LookupDecl(const IdentifierInfo *II, unsigned NSI, 109 Scope *S, bool enableLazyBuiltinCreation) { 110 if (II == 0) return 0; 111 unsigned NS = NSI; 112 if (getLangOptions().CPlusPlus && (NS & Decl::IDNS_Ordinary)) 113 NS |= Decl::IDNS_Tag; 114 115 // Scan up the scope chain looking for a decl that matches this identifier 116 // that is in the appropriate namespace. This search should not take long, as 117 // shadowing of names is uncommon, and deep shadowing is extremely uncommon. 118 NamedDecl *ND = IdResolver.Lookup(II, NS); 119 if (ND) return ND; 120 121 // If we didn't find a use of this identifier, and if the identifier 122 // corresponds to a compiler builtin, create the decl object for the builtin 123 // now, injecting it into translation unit scope, and return it. 124 if (NS & Decl::IDNS_Ordinary) { 125 if (enableLazyBuiltinCreation) { 126 // If this is a builtin on this (or all) targets, create the decl. 127 if (unsigned BuiltinID = II->getBuiltinID()) 128 return LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID, S); 129 } 130 if (getLangOptions().ObjC1) { 131 // @interface and @compatibility_alias introduce typedef-like names. 132 // Unlike typedef's, they can only be introduced at file-scope (and are 133 // therefore not scoped decls). They can, however, be shadowed by 134 // other names in IDNS_Ordinary. 135 ObjCInterfaceDeclsTy::iterator IDI = ObjCInterfaceDecls.find(II); 136 if (IDI != ObjCInterfaceDecls.end()) 137 return IDI->second; 138 ObjCAliasTy::iterator I = ObjCAliasDecls.find(II); 139 if (I != ObjCAliasDecls.end()) 140 return I->second->getClassInterface(); 141 } 142 } 143 return 0; 144} 145 146void Sema::InitBuiltinVaListType() 147{ 148 if (!Context.getBuiltinVaListType().isNull()) 149 return; 150 151 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 152 Decl *VaDecl = LookupDecl(VaIdent, Decl::IDNS_Ordinary, TUScope); 153 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 154 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 155} 156 157/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 158/// lazily create a decl for it. 159ScopedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 160 Scope *S) { 161 Builtin::ID BID = (Builtin::ID)bid; 162 163 if (BID == Builtin::BI__builtin_va_start || 164 BID == Builtin::BI__builtin_va_copy || 165 BID == Builtin::BI__builtin_va_end) 166 InitBuiltinVaListType(); 167 168 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 169 FunctionDecl *New = FunctionDecl::Create(Context, CurContext, 170 SourceLocation(), II, R, 171 FunctionDecl::Extern, false, 0); 172 173 // TUScope is the translation-unit scope to insert this function into. 174 TUScope->AddDecl(New); 175 176 // Add this decl to the end of the identifier info. 177 IdResolver.AddGlobalDecl(New); 178 179 return New; 180} 181 182/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 183/// and scope as a previous declaration 'Old'. Figure out how to resolve this 184/// situation, merging decls or emitting diagnostics as appropriate. 185/// 186TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 187 // Verify the old decl was also a typedef. 188 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 189 if (!Old) { 190 Diag(New->getLocation(), diag::err_redefinition_different_kind, 191 New->getName()); 192 Diag(OldD->getLocation(), diag::err_previous_definition); 193 return New; 194 } 195 196 // Allow multiple definitions for ObjC built-in typedefs. 197 // FIXME: Verify the underlying types are equivalent! 198 if (getLangOptions().ObjC1 && isBuiltinObjCType(New)) 199 return Old; 200 201 // Redeclaration of a type is a constraint violation (6.7.2.3p1). 202 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 203 // *either* declaration is in a system header. The code below implements 204 // this adhoc compatibility rule. FIXME: The following code will not 205 // work properly when compiling ".i" files (containing preprocessed output). 206 SourceManager &SrcMgr = Context.getSourceManager(); 207 const FileEntry *OldDeclFile = SrcMgr.getFileEntryForLoc(Old->getLocation()); 208 const FileEntry *NewDeclFile = SrcMgr.getFileEntryForLoc(New->getLocation()); 209 HeaderSearch &HdrInfo = PP.getHeaderSearchInfo(); 210 DirectoryLookup::DirType OldDirType = HdrInfo.getFileDirFlavor(OldDeclFile); 211 DirectoryLookup::DirType NewDirType = HdrInfo.getFileDirFlavor(NewDeclFile); 212 213 // Allow reclarations in both SystemHeaderDir and ExternCSystemHeaderDir. 214 if ((OldDirType != DirectoryLookup::NormalHeaderDir || 215 NewDirType != DirectoryLookup::NormalHeaderDir) || 216 getLangOptions().Microsoft) 217 return New; 218 219 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 220 // TODO: This is totally simplistic. It should handle merging functions 221 // together etc, merging extern int X; int X; ... 222 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 223 Diag(Old->getLocation(), diag::err_previous_definition); 224 return New; 225} 226 227/// DeclhasAttr - returns true if decl Declaration already has the target attribute. 228static bool DeclHasAttr(const Decl *decl, const Attr *target) { 229 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 230 if (attr->getKind() == target->getKind()) 231 return true; 232 233 return false; 234} 235 236/// MergeAttributes - append attributes from the Old decl to the New one. 237static void MergeAttributes(Decl *New, Decl *Old) { 238 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 239 240// FIXME: fix this code to cleanup the Old attrs correctly 241 while (attr) { 242 tmp = attr; 243 attr = attr->getNext(); 244 245 if (!DeclHasAttr(New, tmp)) { 246 New->addAttr(tmp); 247 } else { 248 tmp->setNext(0); 249 delete(tmp); 250 } 251 } 252} 253 254/// MergeFunctionDecl - We just parsed a function 'New' from 255/// declarator D which has the same name and scope as a previous 256/// declaration 'Old'. Figure out how to resolve this situation, 257/// merging decls or emitting diagnostics as appropriate. 258/// 259FunctionDecl *Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 260 // Verify the old decl was also a function. 261 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 262 if (!Old) { 263 Diag(New->getLocation(), diag::err_redefinition_different_kind, 264 New->getName()); 265 Diag(OldD->getLocation(), diag::err_previous_definition); 266 return New; 267 } 268 269 MergeAttributes(New, Old); 270 271 QualType OldQType = Context.getCanonicalType(Old->getType()); 272 QualType NewQType = Context.getCanonicalType(New->getType()); 273 274 // C++ [dcl.fct]p3: 275 // All declarations for a function shall agree exactly in both the 276 // return type and the parameter-type-list. 277 if (getLangOptions().CPlusPlus && OldQType == NewQType) 278 return MergeCXXFunctionDecl(New, Old); 279 280 // C: Function types need to be compatible, not identical. This handles 281 // duplicate function decls like "void f(int); void f(enum X);" properly. 282 if (!getLangOptions().CPlusPlus && 283 Context.functionTypesAreCompatible(OldQType, NewQType)) { 284 return New; 285 } 286 287 // A function that has already been declared has been redeclared or defined 288 // with a different type- show appropriate diagnostic 289 diag::kind PrevDiag; 290 if (Old->getBody()) 291 PrevDiag = diag::err_previous_definition; 292 else if (Old->isImplicit()) 293 PrevDiag = diag::err_previous_implicit_declaration; 294 else 295 PrevDiag = diag::err_previous_declaration; 296 297 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 298 // TODO: This is totally simplistic. It should handle merging functions 299 // together etc, merging extern int X; int X; ... 300 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 301 Diag(Old->getLocation(), PrevDiag); 302 return New; 303} 304 305/// equivalentArrayTypes - Used to determine whether two array types are 306/// equivalent. 307/// We need to check this explicitly as an incomplete array definition is 308/// considered a VariableArrayType, so will not match a complete array 309/// definition that would be otherwise equivalent. 310static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 311 const ArrayType *NewAT = NewQType->getAsArrayType(); 312 const ArrayType *OldAT = OldQType->getAsArrayType(); 313 314 if (!NewAT || !OldAT) 315 return false; 316 317 // If either (or both) array types in incomplete we need to strip off the 318 // outer VariableArrayType. Once the outer VAT is removed the remaining 319 // types must be identical if the array types are to be considered 320 // equivalent. 321 // eg. int[][1] and int[1][1] become 322 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 323 // removing the outermost VAT gives 324 // CAT(1, int) and CAT(1, int) 325 // which are equal, therefore the array types are equivalent. 326 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 327 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 328 return false; 329 NewQType = NewAT->getElementType().getCanonicalType(); 330 OldQType = OldAT->getElementType().getCanonicalType(); 331 } 332 333 return NewQType == OldQType; 334} 335 336/// MergeVarDecl - We just parsed a variable 'New' which has the same name 337/// and scope as a previous declaration 'Old'. Figure out how to resolve this 338/// situation, merging decls or emitting diagnostics as appropriate. 339/// 340/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 341/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 342/// 343VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 344 // Verify the old decl was also a variable. 345 VarDecl *Old = dyn_cast<VarDecl>(OldD); 346 if (!Old) { 347 Diag(New->getLocation(), diag::err_redefinition_different_kind, 348 New->getName()); 349 Diag(OldD->getLocation(), diag::err_previous_definition); 350 return New; 351 } 352 353 MergeAttributes(New, Old); 354 355 // Verify the types match. 356 QualType OldCType = Context.getCanonicalType(Old->getType()); 357 QualType NewCType = Context.getCanonicalType(New->getType()); 358 if (OldCType != NewCType && !areEquivalentArrayTypes(NewCType, OldCType)) { 359 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 360 Diag(Old->getLocation(), diag::err_previous_definition); 361 return New; 362 } 363 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 364 if (New->getStorageClass() == VarDecl::Static && 365 (Old->getStorageClass() == VarDecl::None || 366 Old->getStorageClass() == VarDecl::Extern)) { 367 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 368 Diag(Old->getLocation(), diag::err_previous_definition); 369 return New; 370 } 371 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 372 if (New->getStorageClass() != VarDecl::Static && 373 Old->getStorageClass() == VarDecl::Static) { 374 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 375 Diag(Old->getLocation(), diag::err_previous_definition); 376 return New; 377 } 378 // We've verified the types match, now handle "tentative" definitions. 379 if (Old->isFileVarDecl() && New->isFileVarDecl()) { 380 // Handle C "tentative" external object definitions (C99 6.9.2). 381 bool OldIsTentative = false; 382 bool NewIsTentative = false; 383 384 if (!Old->getInit() && 385 (Old->getStorageClass() == VarDecl::None || 386 Old->getStorageClass() == VarDecl::Static)) 387 OldIsTentative = true; 388 389 // FIXME: this check doesn't work (since the initializer hasn't been 390 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 391 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 392 // thrown out the old decl. 393 if (!New->getInit() && 394 (New->getStorageClass() == VarDecl::None || 395 New->getStorageClass() == VarDecl::Static)) 396 ; // change to NewIsTentative = true; once the code is moved. 397 398 if (NewIsTentative || OldIsTentative) 399 return New; 400 } 401 if (Old->getStorageClass() != VarDecl::Extern && 402 New->getStorageClass() != VarDecl::Extern) { 403 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 404 Diag(Old->getLocation(), diag::err_previous_definition); 405 } 406 return New; 407} 408 409/// CheckParmsForFunctionDef - Check that the parameters of the given 410/// function are appropriate for the definition of a function. This 411/// takes care of any checks that cannot be performed on the 412/// declaration itself, e.g., that the types of each of the function 413/// parameters are complete. 414bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 415 bool HasInvalidParm = false; 416 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 417 ParmVarDecl *Param = FD->getParamDecl(p); 418 419 // C99 6.7.5.3p4: the parameters in a parameter type list in a 420 // function declarator that is part of a function definition of 421 // that function shall not have incomplete type. 422 if (Param->getType()->isIncompleteType() && 423 !Param->isInvalidDecl()) { 424 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type, 425 Param->getType().getAsString()); 426 Param->setInvalidDecl(); 427 HasInvalidParm = true; 428 } 429 } 430 431 return HasInvalidParm; 432} 433 434/// CreateImplicitParameter - Creates an implicit function parameter 435/// in the scope S and with the given type. This routine is used, for 436/// example, to create the implicit "self" parameter in an Objective-C 437/// method. 438ParmVarDecl * 439Sema::CreateImplicitParameter(Scope *S, IdentifierInfo *Id, 440 SourceLocation IdLoc, QualType Type) { 441 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, IdLoc, Id, Type, 442 VarDecl::None, 0, 0); 443 if (Id) 444 PushOnScopeChains(New, S); 445 446 return New; 447} 448 449/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 450/// no declarator (e.g. "struct foo;") is parsed. 451Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 452 // TODO: emit error on 'int;' or 'const enum foo;'. 453 // TODO: emit error on 'typedef int;' 454 // if (!DS.isMissingDeclaratorOk()) Diag(...); 455 456 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 457} 458 459bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 460 // Get the type before calling CheckSingleAssignmentConstraints(), since 461 // it can promote the expression. 462 QualType InitType = Init->getType(); 463 464 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 465 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 466 InitType, Init, "initializing"); 467} 468 469bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 470 QualType ElementType) { 471 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 472 if (CheckSingleInitializer(expr, ElementType)) 473 return true; // types weren't compatible. 474 475 if (savExpr != expr) // The type was promoted, update initializer list. 476 IList->setInit(slot, expr); 477 return false; 478} 479 480bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 481 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 482 // C99 6.7.8p14. We have an array of character type with unknown size 483 // being initialized to a string literal. 484 llvm::APSInt ConstVal(32); 485 ConstVal = strLiteral->getByteLength() + 1; 486 // Return a new array type (C99 6.7.8p22). 487 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 488 ArrayType::Normal, 0); 489 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 490 // C99 6.7.8p14. We have an array of character type with known size. 491 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 492 Diag(strLiteral->getSourceRange().getBegin(), 493 diag::warn_initializer_string_for_char_array_too_long, 494 strLiteral->getSourceRange()); 495 } else { 496 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 497 } 498 // Set type from "char *" to "constant array of char". 499 strLiteral->setType(DeclT); 500 // For now, we always return false (meaning success). 501 return false; 502} 503 504StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 505 const ArrayType *AT = DeclType->getAsArrayType(); 506 if (AT && AT->getElementType()->isCharType()) { 507 return dyn_cast<StringLiteral>(Init); 508 } 509 return 0; 510} 511 512// CheckInitializerListTypes - Checks the types of elements of an initializer 513// list. This function is recursive: it calls itself to initialize subelements 514// of aggregate types. Note that the topLevel parameter essentially refers to 515// whether this expression "owns" the initializer list passed in, or if this 516// initialization is taking elements out of a parent initializer. Each 517// call to this function adds zero or more to startIndex, reports any errors, 518// and returns true if it found any inconsistent types. 519bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 520 bool topLevel, unsigned& startIndex) { 521 bool hadError = false; 522 523 if (DeclType->isScalarType()) { 524 // The simplest case: initializing a single scalar 525 if (topLevel) { 526 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 527 IList->getSourceRange()); 528 } 529 if (startIndex < IList->getNumInits()) { 530 Expr* expr = IList->getInit(startIndex); 531 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 532 // FIXME: Should an error be reported here instead? 533 unsigned newIndex = 0; 534 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 535 } else { 536 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 537 } 538 ++startIndex; 539 } 540 // FIXME: Should an error be reported for empty initializer list + scalar? 541 } else if (DeclType->isVectorType()) { 542 if (startIndex < IList->getNumInits()) { 543 const VectorType *VT = DeclType->getAsVectorType(); 544 int maxElements = VT->getNumElements(); 545 QualType elementType = VT->getElementType(); 546 547 for (int i = 0; i < maxElements; ++i) { 548 // Don't attempt to go past the end of the init list 549 if (startIndex >= IList->getNumInits()) 550 break; 551 Expr* expr = IList->getInit(startIndex); 552 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 553 unsigned newIndex = 0; 554 hadError |= CheckInitializerListTypes(SubInitList, elementType, 555 true, newIndex); 556 ++startIndex; 557 } else { 558 hadError |= CheckInitializerListTypes(IList, elementType, 559 false, startIndex); 560 } 561 } 562 } 563 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 564 if (DeclType->isStructureType() || DeclType->isUnionType()) { 565 if (startIndex < IList->getNumInits() && !topLevel && 566 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 567 DeclType)) { 568 // We found a compatible struct; per the standard, this initializes the 569 // struct. (The C standard technically says that this only applies for 570 // initializers for declarations with automatic scope; however, this 571 // construct is unambiguous anyway because a struct cannot contain 572 // a type compatible with itself. We'll output an error when we check 573 // if the initializer is constant.) 574 // FIXME: Is a call to CheckSingleInitializer required here? 575 ++startIndex; 576 } else { 577 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 578 579 // If the record is invalid, some of it's members are invalid. To avoid 580 // confusion, we forgo checking the intializer for the entire record. 581 if (structDecl->isInvalidDecl()) 582 return true; 583 584 // If structDecl is a forward declaration, this loop won't do anything; 585 // That's okay, because an error should get printed out elsewhere. It 586 // might be worthwhile to skip over the rest of the initializer, though. 587 int numMembers = structDecl->getNumMembers() - 588 structDecl->hasFlexibleArrayMember(); 589 for (int i = 0; i < numMembers; i++) { 590 // Don't attempt to go past the end of the init list 591 if (startIndex >= IList->getNumInits()) 592 break; 593 FieldDecl * curField = structDecl->getMember(i); 594 if (!curField->getIdentifier()) { 595 // Don't initialize unnamed fields, e.g. "int : 20;" 596 continue; 597 } 598 QualType fieldType = curField->getType(); 599 Expr* expr = IList->getInit(startIndex); 600 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 601 unsigned newStart = 0; 602 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 603 true, newStart); 604 ++startIndex; 605 } else { 606 hadError |= CheckInitializerListTypes(IList, fieldType, 607 false, startIndex); 608 } 609 if (DeclType->isUnionType()) 610 break; 611 } 612 // FIXME: Implement flexible array initialization GCC extension (it's a 613 // really messy extension to implement, unfortunately...the necessary 614 // information isn't actually even here!) 615 } 616 } else if (DeclType->isArrayType()) { 617 // Check for the special-case of initializing an array with a string. 618 if (startIndex < IList->getNumInits()) { 619 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 620 DeclType)) { 621 CheckStringLiteralInit(lit, DeclType); 622 ++startIndex; 623 if (topLevel && startIndex < IList->getNumInits()) { 624 // We have leftover initializers; warn 625 Diag(IList->getInit(startIndex)->getLocStart(), 626 diag::err_excess_initializers_in_char_array_initializer, 627 IList->getInit(startIndex)->getSourceRange()); 628 } 629 return false; 630 } 631 } 632 int maxElements; 633 if (DeclType->isIncompleteArrayType()) { 634 // FIXME: use a proper constant 635 maxElements = 0x7FFFFFFF; 636 } else if (const VariableArrayType *VAT = 637 DeclType->getAsVariableArrayType()) { 638 // Check for VLAs; in standard C it would be possible to check this 639 // earlier, but I don't know where clang accepts VLAs (gcc accepts 640 // them in all sorts of strange places). 641 Diag(VAT->getSizeExpr()->getLocStart(), 642 diag::err_variable_object_no_init, 643 VAT->getSizeExpr()->getSourceRange()); 644 hadError = true; 645 maxElements = 0x7FFFFFFF; 646 } else { 647 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 648 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 649 } 650 QualType elementType = DeclType->getAsArrayType()->getElementType(); 651 int numElements = 0; 652 for (int i = 0; i < maxElements; ++i, ++numElements) { 653 // Don't attempt to go past the end of the init list 654 if (startIndex >= IList->getNumInits()) 655 break; 656 Expr* expr = IList->getInit(startIndex); 657 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 658 unsigned newIndex = 0; 659 hadError |= CheckInitializerListTypes(SubInitList, elementType, 660 true, newIndex); 661 ++startIndex; 662 } else { 663 hadError |= CheckInitializerListTypes(IList, elementType, 664 false, startIndex); 665 } 666 } 667 if (DeclType->isIncompleteArrayType()) { 668 // If this is an incomplete array type, the actual type needs to 669 // be calculated here 670 if (numElements == 0) { 671 // Sizing an array implicitly to zero is not allowed 672 // (It could in theory be allowed, but it doesn't really matter.) 673 Diag(IList->getLocStart(), 674 diag::err_at_least_one_initializer_needed_to_size_array); 675 hadError = true; 676 } else { 677 llvm::APSInt ConstVal(32); 678 ConstVal = numElements; 679 DeclType = Context.getConstantArrayType(elementType, ConstVal, 680 ArrayType::Normal, 0); 681 } 682 } 683 } else { 684 assert(0 && "Aggregate that isn't a function or array?!"); 685 } 686 } else { 687 // In C, all types are either scalars or aggregates, but 688 // additional handling is needed here for C++ (and possibly others?). 689 assert(0 && "Unsupported initializer type"); 690 } 691 692 // If this init list is a base list, we set the type; an initializer doesn't 693 // fundamentally have a type, but this makes the ASTs a bit easier to read 694 if (topLevel) 695 IList->setType(DeclType); 696 697 if (topLevel && startIndex < IList->getNumInits()) { 698 // We have leftover initializers; warn 699 Diag(IList->getInit(startIndex)->getLocStart(), 700 diag::warn_excess_initializers, 701 IList->getInit(startIndex)->getSourceRange()); 702 } 703 return hadError; 704} 705 706bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 707 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 708 // of unknown size ("[]") or an object type that is not a variable array type. 709 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 710 return Diag(VAT->getSizeExpr()->getLocStart(), 711 diag::err_variable_object_no_init, 712 VAT->getSizeExpr()->getSourceRange()); 713 714 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 715 if (!InitList) { 716 // FIXME: Handle wide strings 717 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 718 return CheckStringLiteralInit(strLiteral, DeclType); 719 720 if (DeclType->isArrayType()) 721 return Diag(Init->getLocStart(), 722 diag::err_array_init_list_required, 723 Init->getSourceRange()); 724 725 return CheckSingleInitializer(Init, DeclType); 726 } 727 unsigned newIndex = 0; 728 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 729} 730 731Sema::DeclTy * 732Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 733 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 734 IdentifierInfo *II = D.getIdentifier(); 735 736 // All of these full declarators require an identifier. If it doesn't have 737 // one, the ParsedFreeStandingDeclSpec action should be used. 738 if (II == 0) { 739 Diag(D.getDeclSpec().getSourceRange().getBegin(), 740 diag::err_declarator_need_ident, 741 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 742 return 0; 743 } 744 745 // The scope passed in may not be a decl scope. Zip up the scope tree until 746 // we find one that is. 747 while ((S->getFlags() & Scope::DeclScope) == 0) 748 S = S->getParent(); 749 750 // See if this is a redefinition of a variable in the same scope. 751 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 752 ScopedDecl *New; 753 bool InvalidDecl = false; 754 755 // In C++, the previous declaration we find might be a tag type 756 // (class or enum). In this case, the new declaration will hide the 757 // tag type. 758 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 759 PrevDecl = 0; 760 761 QualType R = GetTypeForDeclarator(D, S); 762 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 763 764 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 765 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 766 if (!NewTD) return 0; 767 768 // Handle attributes prior to checking for duplicates in MergeVarDecl 769 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 770 D.getAttributes()); 771 // Merge the decl with the existing one if appropriate. If the decl is 772 // in an outer scope, it isn't the same thing. 773 if (PrevDecl && S->isDeclScope(PrevDecl)) { 774 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 775 if (NewTD == 0) return 0; 776 } 777 New = NewTD; 778 if (S->getParent() == 0) { 779 // C99 6.7.7p2: If a typedef name specifies a variably modified type 780 // then it shall have block scope. 781 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 782 // FIXME: Diagnostic needs to be fixed. 783 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 784 InvalidDecl = true; 785 } 786 } 787 } else if (R.getTypePtr()->isFunctionType()) { 788 FunctionDecl::StorageClass SC = FunctionDecl::None; 789 switch (D.getDeclSpec().getStorageClassSpec()) { 790 default: assert(0 && "Unknown storage class!"); 791 case DeclSpec::SCS_auto: 792 case DeclSpec::SCS_register: 793 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 794 R.getAsString()); 795 InvalidDecl = true; 796 break; 797 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 798 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 799 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 800 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 801 } 802 803 bool isInline = D.getDeclSpec().isInlineSpecified(); 804 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 805 D.getIdentifierLoc(), 806 II, R, SC, isInline, 807 LastDeclarator); 808 // Handle attributes. 809 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 810 D.getAttributes()); 811 812 // Copy the parameter declarations from the declarator D to 813 // the function declaration NewFD, if they are available. 814 if (D.getNumTypeObjects() > 0 && 815 D.getTypeObject(0).Fun.hasPrototype) { 816 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 817 818 // Create Decl objects for each parameter, adding them to the 819 // FunctionDecl. 820 llvm::SmallVector<ParmVarDecl*, 16> Params; 821 822 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 823 // function that takes no arguments, not a function that takes a 824 // single void argument. 825 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 826 FTI.ArgInfo[0].Param && 827 !((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 828 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 829 // empty arg list, don't push any params. 830 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 831 832 // In C++, the empty parameter-type-list must be spelled "void"; a 833 // typedef of void is not permitted. 834 if (getLangOptions().CPlusPlus && 835 Param->getType() != Context.VoidTy) { 836 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 837 } 838 839 } else { 840 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 841 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 842 } 843 844 NewFD->setParams(&Params[0], Params.size()); 845 } 846 847 // Merge the decl with the existing one if appropriate. Since C functions 848 // are in a flat namespace, make sure we consider decls in outer scopes. 849 if (PrevDecl) { 850 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 851 if (NewFD == 0) return 0; 852 } 853 New = NewFD; 854 855 // In C++, check default arguments now that we have merged decls. 856 if (getLangOptions().CPlusPlus) 857 CheckCXXDefaultArguments(NewFD); 858 } else { 859 if (R.getTypePtr()->isObjCInterfaceType()) { 860 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 861 D.getIdentifier()->getName()); 862 InvalidDecl = true; 863 } 864 865 VarDecl *NewVD; 866 VarDecl::StorageClass SC; 867 switch (D.getDeclSpec().getStorageClassSpec()) { 868 default: assert(0 && "Unknown storage class!"); 869 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 870 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 871 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 872 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 873 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 874 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 875 } 876 if (S->getParent() == 0) { 877 // C99 6.9p2: The storage-class specifiers auto and register shall not 878 // appear in the declaration specifiers in an external declaration. 879 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 880 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 881 R.getAsString()); 882 InvalidDecl = true; 883 } 884 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 885 II, R, SC, LastDeclarator); 886 } else { 887 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 888 II, R, SC, LastDeclarator); 889 } 890 // Handle attributes prior to checking for duplicates in MergeVarDecl 891 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 892 D.getAttributes()); 893 894 // Emit an error if an address space was applied to decl with local storage. 895 // This includes arrays of objects with address space qualifiers, but not 896 // automatic variables that point to other address spaces. 897 // ISO/IEC TR 18037 S5.1.2 898 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 899 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 900 InvalidDecl = true; 901 } 902 // Merge the decl with the existing one if appropriate. If the decl is 903 // in an outer scope, it isn't the same thing. 904 if (PrevDecl && S->isDeclScope(PrevDecl)) { 905 NewVD = MergeVarDecl(NewVD, PrevDecl); 906 if (NewVD == 0) return 0; 907 } 908 New = NewVD; 909 } 910 911 // If this has an identifier, add it to the scope stack. 912 if (II) 913 PushOnScopeChains(New, S); 914 // If any semantic error occurred, mark the decl as invalid. 915 if (D.getInvalidType() || InvalidDecl) 916 New->setInvalidDecl(); 917 918 return New; 919} 920 921bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 922 SourceLocation loc; 923 // FIXME: Remove the isReference check and handle assignment to a reference. 924 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 925 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 926 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 927 return true; 928 } 929 return false; 930} 931 932void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 933 Decl *RealDecl = static_cast<Decl *>(dcl); 934 Expr *Init = static_cast<Expr *>(init); 935 assert(Init && "missing initializer"); 936 937 // If there is no declaration, there was an error parsing it. Just ignore 938 // the initializer. 939 if (RealDecl == 0) { 940 delete Init; 941 return; 942 } 943 944 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 945 if (!VDecl) { 946 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 947 diag::err_illegal_initializer); 948 RealDecl->setInvalidDecl(); 949 return; 950 } 951 // Get the decls type and save a reference for later, since 952 // CheckInitializerTypes may change it. 953 QualType DclT = VDecl->getType(), SavT = DclT; 954 if (VDecl->isBlockVarDecl()) { 955 VarDecl::StorageClass SC = VDecl->getStorageClass(); 956 if (SC == VarDecl::Extern) { // C99 6.7.8p5 957 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 958 VDecl->setInvalidDecl(); 959 } else if (!VDecl->isInvalidDecl()) { 960 if (CheckInitializerTypes(Init, DclT)) 961 VDecl->setInvalidDecl(); 962 if (SC == VarDecl::Static) // C99 6.7.8p4. 963 CheckForConstantInitializer(Init, DclT); 964 } 965 } else if (VDecl->isFileVarDecl()) { 966 if (VDecl->getStorageClass() == VarDecl::Extern) 967 Diag(VDecl->getLocation(), diag::warn_extern_init); 968 if (!VDecl->isInvalidDecl()) 969 if (CheckInitializerTypes(Init, DclT)) 970 VDecl->setInvalidDecl(); 971 972 // C99 6.7.8p4. All file scoped initializers need to be constant. 973 CheckForConstantInitializer(Init, DclT); 974 } 975 // If the type changed, it means we had an incomplete type that was 976 // completed by the initializer. For example: 977 // int ary[] = { 1, 3, 5 }; 978 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 979 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 980 VDecl->setType(DclT); 981 Init->setType(DclT); 982 } 983 984 // Attach the initializer to the decl. 985 VDecl->setInit(Init); 986 return; 987} 988 989/// The declarators are chained together backwards, reverse the list. 990Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 991 // Often we have single declarators, handle them quickly. 992 Decl *GroupDecl = static_cast<Decl*>(group); 993 if (GroupDecl == 0) 994 return 0; 995 996 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 997 ScopedDecl *NewGroup = 0; 998 if (Group->getNextDeclarator() == 0) 999 NewGroup = Group; 1000 else { // reverse the list. 1001 while (Group) { 1002 ScopedDecl *Next = Group->getNextDeclarator(); 1003 Group->setNextDeclarator(NewGroup); 1004 NewGroup = Group; 1005 Group = Next; 1006 } 1007 } 1008 // Perform semantic analysis that depends on having fully processed both 1009 // the declarator and initializer. 1010 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 1011 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 1012 if (!IDecl) 1013 continue; 1014 QualType T = IDecl->getType(); 1015 1016 // C99 6.7.5.2p2: If an identifier is declared to be an object with 1017 // static storage duration, it shall not have a variable length array. 1018 if ((IDecl->isFileVarDecl() || IDecl->isBlockVarDecl()) && 1019 IDecl->getStorageClass() == VarDecl::Static) { 1020 if (T->getAsVariableArrayType()) { 1021 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 1022 IDecl->setInvalidDecl(); 1023 } 1024 } 1025 // Block scope. C99 6.7p7: If an identifier for an object is declared with 1026 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 1027 if (IDecl->isBlockVarDecl() && 1028 IDecl->getStorageClass() != VarDecl::Extern) { 1029 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1030 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1031 T.getAsString()); 1032 IDecl->setInvalidDecl(); 1033 } 1034 } 1035 // File scope. C99 6.9.2p2: A declaration of an identifier for and 1036 // object that has file scope without an initializer, and without a 1037 // storage-class specifier or with the storage-class specifier "static", 1038 // constitutes a tentative definition. Note: A tentative definition with 1039 // external linkage is valid (C99 6.2.2p5). 1040 if (IDecl && !IDecl->getInit() && 1041 (IDecl->getStorageClass() == VarDecl::Static || 1042 IDecl->getStorageClass() == VarDecl::None)) { 1043 if (T->isIncompleteArrayType()) { 1044 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 1045 // array to be completed. Don't issue a diagnostic. 1046 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1047 // C99 6.9.2p3: If the declaration of an identifier for an object is 1048 // a tentative definition and has internal linkage (C99 6.2.2p3), the 1049 // declared type shall not be an incomplete type. 1050 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1051 T.getAsString()); 1052 IDecl->setInvalidDecl(); 1053 } 1054 } 1055 } 1056 return NewGroup; 1057} 1058 1059/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 1060/// to introduce parameters into function prototype scope. 1061Sema::DeclTy * 1062Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 1063 DeclSpec &DS = D.getDeclSpec(); 1064 1065 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 1066 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1067 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 1068 Diag(DS.getStorageClassSpecLoc(), 1069 diag::err_invalid_storage_class_in_func_decl); 1070 DS.ClearStorageClassSpecs(); 1071 } 1072 if (DS.isThreadSpecified()) { 1073 Diag(DS.getThreadSpecLoc(), 1074 diag::err_invalid_storage_class_in_func_decl); 1075 DS.ClearStorageClassSpecs(); 1076 } 1077 1078 1079 // In this context, we *do not* check D.getInvalidType(). If the declarator 1080 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 1081 // though it will not reflect the user specified type. 1082 QualType parmDeclType = GetTypeForDeclarator(D, S); 1083 1084 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 1085 1086 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 1087 // Can this happen for params? We already checked that they don't conflict 1088 // among each other. Here they can only shadow globals, which is ok. 1089 IdentifierInfo *II = D.getIdentifier(); 1090 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 1091 if (S->isDeclScope(PrevDecl)) { 1092 Diag(D.getIdentifierLoc(), diag::err_param_redefinition, 1093 dyn_cast<NamedDecl>(PrevDecl)->getName()); 1094 1095 // Recover by removing the name 1096 II = 0; 1097 D.SetIdentifier(0, D.getIdentifierLoc()); 1098 } 1099 } 1100 1101 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 1102 // Doing the promotion here has a win and a loss. The win is the type for 1103 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 1104 // code generator). The loss is the orginal type isn't preserved. For example: 1105 // 1106 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1107 // int blockvardecl[5]; 1108 // sizeof(parmvardecl); // size == 4 1109 // sizeof(blockvardecl); // size == 20 1110 // } 1111 // 1112 // For expressions, all implicit conversions are captured using the 1113 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1114 // 1115 // FIXME: If a source translation tool needs to see the original type, then 1116 // we need to consider storing both types (in ParmVarDecl)... 1117 // 1118 if (parmDeclType->isArrayType()) { 1119 // int x[restrict 4] -> int *restrict 1120 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1121 } else if (parmDeclType->isFunctionType()) 1122 parmDeclType = Context.getPointerType(parmDeclType); 1123 1124 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 1125 D.getIdentifierLoc(), II, 1126 parmDeclType, VarDecl::None, 1127 0, 0); 1128 1129 if (D.getInvalidType()) 1130 New->setInvalidDecl(); 1131 1132 if (II) 1133 PushOnScopeChains(New, S); 1134 1135 HandleDeclAttributes(New, D.getAttributes(), 0); 1136 return New; 1137 1138} 1139 1140Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1141 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1142 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1143 "Not a function declarator!"); 1144 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1145 1146 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1147 // for a K&R function. 1148 if (!FTI.hasPrototype) { 1149 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1150 if (FTI.ArgInfo[i].Param == 0) { 1151 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1152 FTI.ArgInfo[i].Ident->getName()); 1153 // Implicitly declare the argument as type 'int' for lack of a better 1154 // type. 1155 DeclSpec DS; 1156 const char* PrevSpec; // unused 1157 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 1158 PrevSpec); 1159 Declarator ParamD(DS, Declarator::KNRTypeListContext); 1160 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 1161 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 1162 } 1163 } 1164 1165 // Since this is a function definition, act as though we have information 1166 // about the arguments. 1167 if (FTI.NumArgs) 1168 FTI.hasPrototype = true; 1169 } else { 1170 // FIXME: Diagnose arguments without names in C. 1171 } 1172 1173 Scope *GlobalScope = FnBodyScope->getParent(); 1174 1175 // See if this is a redefinition. 1176 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1177 GlobalScope); 1178 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1179 if (FD->getBody()) { 1180 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1181 D.getIdentifier()->getName()); 1182 Diag(FD->getLocation(), diag::err_previous_definition); 1183 } 1184 } 1185 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1186 FunctionDecl *FD = cast<FunctionDecl>(decl); 1187 CurFunctionDecl = FD; 1188 PushDeclContext(FD); 1189 1190 // Check the validity of our function parameters 1191 CheckParmsForFunctionDef(FD); 1192 1193 // Introduce our parameters into the function scope 1194 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1195 ParmVarDecl *Param = FD->getParamDecl(p); 1196 // If this has an identifier, add it to the scope stack. 1197 if (Param->getIdentifier()) 1198 PushOnScopeChains(Param, FnBodyScope); 1199 } 1200 1201 return FD; 1202} 1203 1204Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1205 Decl *dcl = static_cast<Decl *>(D); 1206 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1207 FD->setBody((Stmt*)Body); 1208 assert(FD == CurFunctionDecl && "Function parsing confused"); 1209 CurFunctionDecl = 0; 1210 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1211 MD->setBody((Stmt*)Body); 1212 CurMethodDecl = 0; 1213 } 1214 PopDeclContext(); 1215 // Verify and clean out per-function state. 1216 1217 // Check goto/label use. 1218 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1219 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1220 // Verify that we have no forward references left. If so, there was a goto 1221 // or address of a label taken, but no definition of it. Label fwd 1222 // definitions are indicated with a null substmt. 1223 if (I->second->getSubStmt() == 0) { 1224 LabelStmt *L = I->second; 1225 // Emit error. 1226 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1227 1228 // At this point, we have gotos that use the bogus label. Stitch it into 1229 // the function body so that they aren't leaked and that the AST is well 1230 // formed. 1231 if (Body) { 1232 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1233 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1234 } else { 1235 // The whole function wasn't parsed correctly, just delete this. 1236 delete L; 1237 } 1238 } 1239 } 1240 LabelMap.clear(); 1241 1242 return D; 1243} 1244 1245/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1246/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1247ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1248 IdentifierInfo &II, Scope *S) { 1249 if (getLangOptions().C99) // Extension in C99. 1250 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1251 else // Legal in C90, but warn about it. 1252 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1253 1254 // FIXME: handle stuff like: 1255 // void foo() { extern float X(); } 1256 // void bar() { X(); } <-- implicit decl for X in another scope. 1257 1258 // Set a Declarator for the implicit definition: int foo(); 1259 const char *Dummy; 1260 DeclSpec DS; 1261 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1262 Error = Error; // Silence warning. 1263 assert(!Error && "Error setting up implicit decl!"); 1264 Declarator D(DS, Declarator::BlockContext); 1265 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1266 D.SetIdentifier(&II, Loc); 1267 1268 // Find translation-unit scope to insert this function into. 1269 if (Scope *FnS = S->getFnParent()) 1270 S = FnS->getParent(); // Skip all scopes in a function at once. 1271 while (S->getParent()) 1272 S = S->getParent(); 1273 1274 FunctionDecl *FD = 1275 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1276 FD->setImplicit(); 1277 return FD; 1278} 1279 1280 1281TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1282 ScopedDecl *LastDeclarator) { 1283 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1284 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1285 1286 // Scope manipulation handled by caller. 1287 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1288 D.getIdentifierLoc(), 1289 D.getIdentifier(), 1290 T, LastDeclarator); 1291 if (D.getInvalidType()) 1292 NewTD->setInvalidDecl(); 1293 return NewTD; 1294} 1295 1296/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1297/// former case, Name will be non-null. In the later case, Name will be null. 1298/// TagType indicates what kind of tag this is. TK indicates whether this is a 1299/// reference/declaration/definition of a tag. 1300Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1301 SourceLocation KWLoc, IdentifierInfo *Name, 1302 SourceLocation NameLoc, AttributeList *Attr) { 1303 // If this is a use of an existing tag, it must have a name. 1304 assert((Name != 0 || TK == TK_Definition) && 1305 "Nameless record must be a definition!"); 1306 1307 Decl::Kind Kind; 1308 switch (TagType) { 1309 default: assert(0 && "Unknown tag type!"); 1310 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1311 case DeclSpec::TST_union: Kind = Decl::Union; break; 1312 case DeclSpec::TST_class: Kind = Decl::Class; break; 1313 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1314 } 1315 1316 // If this is a named struct, check to see if there was a previous forward 1317 // declaration or definition. 1318 if (TagDecl *PrevDecl = 1319 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1320 1321 // If this is a use of a previous tag, or if the tag is already declared in 1322 // the same scope (so that the definition/declaration completes or 1323 // rementions the tag), reuse the decl. 1324 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1325 // Make sure that this wasn't declared as an enum and now used as a struct 1326 // or something similar. 1327 if (PrevDecl->getKind() != Kind) { 1328 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1329 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1330 } 1331 1332 // If this is a use or a forward declaration, we're good. 1333 if (TK != TK_Definition) 1334 return PrevDecl; 1335 1336 // Diagnose attempts to redefine a tag. 1337 if (PrevDecl->isDefinition()) { 1338 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1339 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1340 // If this is a redefinition, recover by making this struct be 1341 // anonymous, which will make any later references get the previous 1342 // definition. 1343 Name = 0; 1344 } else { 1345 // Okay, this is definition of a previously declared or referenced tag. 1346 // Move the location of the decl to be the definition site. 1347 PrevDecl->setLocation(NameLoc); 1348 return PrevDecl; 1349 } 1350 } 1351 // If we get here, this is a definition of a new struct type in a nested 1352 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1353 // type. 1354 } 1355 1356 // If there is an identifier, use the location of the identifier as the 1357 // location of the decl, otherwise use the location of the struct/union 1358 // keyword. 1359 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1360 1361 // Otherwise, if this is the first time we've seen this tag, create the decl. 1362 TagDecl *New; 1363 switch (Kind) { 1364 default: assert(0 && "Unknown tag kind!"); 1365 case Decl::Enum: 1366 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1367 // enum X { A, B, C } D; D should chain to X. 1368 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1369 // If this is an undefined enum, warn. 1370 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1371 break; 1372 case Decl::Union: 1373 case Decl::Struct: 1374 case Decl::Class: 1375 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1376 // struct X { int A; } D; D should chain to X. 1377 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1378 break; 1379 } 1380 1381 // If this has an identifier, add it to the scope stack. 1382 if (Name) { 1383 // The scope passed in may not be a decl scope. Zip up the scope tree until 1384 // we find one that is. 1385 while ((S->getFlags() & Scope::DeclScope) == 0) 1386 S = S->getParent(); 1387 1388 // Add it to the decl chain. 1389 PushOnScopeChains(New, S); 1390 } 1391 1392 HandleDeclAttributes(New, Attr, 0); 1393 return New; 1394} 1395 1396/// ActOnField - Each field of a struct/union/class is passed into this in order 1397/// to create a FieldDecl object for it. 1398Sema::DeclTy *Sema::ActOnField(Scope *S, 1399 SourceLocation DeclStart, 1400 Declarator &D, ExprTy *BitfieldWidth) { 1401 IdentifierInfo *II = D.getIdentifier(); 1402 Expr *BitWidth = (Expr*)BitfieldWidth; 1403 SourceLocation Loc = DeclStart; 1404 if (II) Loc = D.getIdentifierLoc(); 1405 1406 // FIXME: Unnamed fields can be handled in various different ways, for 1407 // example, unnamed unions inject all members into the struct namespace! 1408 1409 1410 if (BitWidth) { 1411 // TODO: Validate. 1412 //printf("WARNING: BITFIELDS IGNORED!\n"); 1413 1414 // 6.7.2.1p3 1415 // 6.7.2.1p4 1416 1417 } else { 1418 // Not a bitfield. 1419 1420 // validate II. 1421 1422 } 1423 1424 QualType T = GetTypeForDeclarator(D, S); 1425 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1426 bool InvalidDecl = false; 1427 1428 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1429 // than a variably modified type. 1430 if (T->isVariablyModifiedType()) { 1431 // FIXME: This diagnostic needs work 1432 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1433 InvalidDecl = true; 1434 } 1435 // FIXME: Chain fielddecls together. 1436 FieldDecl *NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1437 1438 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1439 D.getAttributes()); 1440 1441 if (D.getInvalidType() || InvalidDecl) 1442 NewFD->setInvalidDecl(); 1443 return NewFD; 1444} 1445 1446/// TranslateIvarVisibility - Translate visibility from a token ID to an 1447/// AST enum value. 1448static ObjCIvarDecl::AccessControl 1449TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1450 switch (ivarVisibility) { 1451 case tok::objc_private: return ObjCIvarDecl::Private; 1452 case tok::objc_public: return ObjCIvarDecl::Public; 1453 case tok::objc_protected: return ObjCIvarDecl::Protected; 1454 case tok::objc_package: return ObjCIvarDecl::Package; 1455 default: assert(false && "Unknown visitibility kind"); 1456 } 1457} 1458 1459/// ActOnIvar - Each ivar field of an objective-c class is passed into this 1460/// in order to create an IvarDecl object for it. 1461Sema::DeclTy *Sema::ActOnIvar(Scope *S, 1462 SourceLocation DeclStart, 1463 Declarator &D, ExprTy *BitfieldWidth, 1464 tok::ObjCKeywordKind Visibility) { 1465 IdentifierInfo *II = D.getIdentifier(); 1466 Expr *BitWidth = (Expr*)BitfieldWidth; 1467 SourceLocation Loc = DeclStart; 1468 if (II) Loc = D.getIdentifierLoc(); 1469 1470 // FIXME: Unnamed fields can be handled in various different ways, for 1471 // example, unnamed unions inject all members into the struct namespace! 1472 1473 1474 if (BitWidth) { 1475 // TODO: Validate. 1476 //printf("WARNING: BITFIELDS IGNORED!\n"); 1477 1478 // 6.7.2.1p3 1479 // 6.7.2.1p4 1480 1481 } else { 1482 // Not a bitfield. 1483 1484 // validate II. 1485 1486 } 1487 1488 QualType T = GetTypeForDeclarator(D, S); 1489 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1490 bool InvalidDecl = false; 1491 1492 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1493 // than a variably modified type. 1494 if (T->isVariablyModifiedType()) { 1495 // FIXME: This diagnostic needs work 1496 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1497 InvalidDecl = true; 1498 } 1499 1500 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T); 1501 1502 HandleDeclAttributes(NewID, D.getDeclSpec().getAttributes(), 1503 D.getAttributes()); 1504 1505 if (D.getInvalidType() || InvalidDecl) 1506 NewID->setInvalidDecl(); 1507 // If we have visibility info, make sure the AST is set accordingly. 1508 if (Visibility != tok::objc_not_keyword) 1509 NewID->setAccessControl(TranslateIvarVisibility(Visibility)); 1510 return NewID; 1511} 1512 1513void Sema::ActOnFields(Scope* S, 1514 SourceLocation RecLoc, DeclTy *RecDecl, 1515 DeclTy **Fields, unsigned NumFields, 1516 SourceLocation LBrac, SourceLocation RBrac) { 1517 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1518 assert(EnclosingDecl && "missing record or interface decl"); 1519 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1520 1521 if (Record && Record->isDefinition()) { 1522 // Diagnose code like: 1523 // struct S { struct S {} X; }; 1524 // We discover this when we complete the outer S. Reject and ignore the 1525 // outer S. 1526 Diag(Record->getLocation(), diag::err_nested_redefinition, 1527 Record->getKindName()); 1528 Diag(RecLoc, diag::err_previous_definition); 1529 Record->setInvalidDecl(); 1530 return; 1531 } 1532 // Verify that all the fields are okay. 1533 unsigned NumNamedMembers = 0; 1534 llvm::SmallVector<FieldDecl*, 32> RecFields; 1535 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1536 1537 for (unsigned i = 0; i != NumFields; ++i) { 1538 1539 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1540 assert(FD && "missing field decl"); 1541 1542 // Remember all fields. 1543 RecFields.push_back(FD); 1544 1545 // Get the type for the field. 1546 Type *FDTy = FD->getType().getTypePtr(); 1547 1548 // C99 6.7.2.1p2 - A field may not be a function type. 1549 if (FDTy->isFunctionType()) { 1550 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1551 FD->getName()); 1552 FD->setInvalidDecl(); 1553 EnclosingDecl->setInvalidDecl(); 1554 continue; 1555 } 1556 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1557 if (FDTy->isIncompleteType()) { 1558 if (!Record) { // Incomplete ivar type is always an error. 1559 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1560 FD->setInvalidDecl(); 1561 EnclosingDecl->setInvalidDecl(); 1562 continue; 1563 } 1564 if (i != NumFields-1 || // ... that the last member ... 1565 Record->getKind() != Decl::Struct || // ... of a structure ... 1566 !FDTy->isArrayType()) { //... may have incomplete array type. 1567 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1568 FD->setInvalidDecl(); 1569 EnclosingDecl->setInvalidDecl(); 1570 continue; 1571 } 1572 if (NumNamedMembers < 1) { //... must have more than named member ... 1573 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1574 FD->getName()); 1575 FD->setInvalidDecl(); 1576 EnclosingDecl->setInvalidDecl(); 1577 continue; 1578 } 1579 // Okay, we have a legal flexible array member at the end of the struct. 1580 if (Record) 1581 Record->setHasFlexibleArrayMember(true); 1582 } 1583 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1584 /// field of another structure or the element of an array. 1585 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1586 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1587 // If this is a member of a union, then entire union becomes "flexible". 1588 if (Record && Record->getKind() == Decl::Union) { 1589 Record->setHasFlexibleArrayMember(true); 1590 } else { 1591 // If this is a struct/class and this is not the last element, reject 1592 // it. Note that GCC supports variable sized arrays in the middle of 1593 // structures. 1594 if (i != NumFields-1) { 1595 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1596 FD->getName()); 1597 FD->setInvalidDecl(); 1598 EnclosingDecl->setInvalidDecl(); 1599 continue; 1600 } 1601 // We support flexible arrays at the end of structs in other structs 1602 // as an extension. 1603 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1604 FD->getName()); 1605 if (Record) 1606 Record->setHasFlexibleArrayMember(true); 1607 } 1608 } 1609 } 1610 /// A field cannot be an Objective-c object 1611 if (FDTy->isObjCInterfaceType()) { 1612 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1613 FD->getName()); 1614 FD->setInvalidDecl(); 1615 EnclosingDecl->setInvalidDecl(); 1616 continue; 1617 } 1618 // Keep track of the number of named members. 1619 if (IdentifierInfo *II = FD->getIdentifier()) { 1620 // Detect duplicate member names. 1621 if (!FieldIDs.insert(II)) { 1622 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1623 // Find the previous decl. 1624 SourceLocation PrevLoc; 1625 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1626 assert(i != e && "Didn't find previous def!"); 1627 if (RecFields[i]->getIdentifier() == II) { 1628 PrevLoc = RecFields[i]->getLocation(); 1629 break; 1630 } 1631 } 1632 Diag(PrevLoc, diag::err_previous_definition); 1633 FD->setInvalidDecl(); 1634 EnclosingDecl->setInvalidDecl(); 1635 continue; 1636 } 1637 ++NumNamedMembers; 1638 } 1639 } 1640 1641 // Okay, we successfully defined 'Record'. 1642 if (Record) { 1643 Record->defineBody(&RecFields[0], RecFields.size()); 1644 Consumer.HandleTagDeclDefinition(Record); 1645 } else { 1646 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1647 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1648 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1649 else if (ObjCImplementationDecl *IMPDecl = 1650 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1651 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1652 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1653 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1654 } 1655 } 1656} 1657 1658Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1659 DeclTy *lastEnumConst, 1660 SourceLocation IdLoc, IdentifierInfo *Id, 1661 SourceLocation EqualLoc, ExprTy *val) { 1662 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1663 EnumConstantDecl *LastEnumConst = 1664 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1665 Expr *Val = static_cast<Expr*>(val); 1666 1667 // The scope passed in may not be a decl scope. Zip up the scope tree until 1668 // we find one that is. 1669 while ((S->getFlags() & Scope::DeclScope) == 0) 1670 S = S->getParent(); 1671 1672 // Verify that there isn't already something declared with this name in this 1673 // scope. 1674 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1675 if (S->isDeclScope(PrevDecl)) { 1676 if (isa<EnumConstantDecl>(PrevDecl)) 1677 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1678 else 1679 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1680 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1681 delete Val; 1682 return 0; 1683 } 1684 } 1685 1686 llvm::APSInt EnumVal(32); 1687 QualType EltTy; 1688 if (Val) { 1689 // Make sure to promote the operand type to int. 1690 UsualUnaryConversions(Val); 1691 1692 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1693 SourceLocation ExpLoc; 1694 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1695 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1696 Id->getName()); 1697 delete Val; 1698 Val = 0; // Just forget about it. 1699 } else { 1700 EltTy = Val->getType(); 1701 } 1702 } 1703 1704 if (!Val) { 1705 if (LastEnumConst) { 1706 // Assign the last value + 1. 1707 EnumVal = LastEnumConst->getInitVal(); 1708 ++EnumVal; 1709 1710 // Check for overflow on increment. 1711 if (EnumVal < LastEnumConst->getInitVal()) 1712 Diag(IdLoc, diag::warn_enum_value_overflow); 1713 1714 EltTy = LastEnumConst->getType(); 1715 } else { 1716 // First value, set to zero. 1717 EltTy = Context.IntTy; 1718 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1719 } 1720 } 1721 1722 EnumConstantDecl *New = 1723 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1724 Val, EnumVal, 1725 LastEnumConst); 1726 1727 // Register this decl in the current scope stack. 1728 PushOnScopeChains(New, S); 1729 return New; 1730} 1731 1732void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1733 DeclTy **Elements, unsigned NumElements) { 1734 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1735 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1736 1737 // TODO: If the result value doesn't fit in an int, it must be a long or long 1738 // long value. ISO C does not support this, but GCC does as an extension, 1739 // emit a warning. 1740 unsigned IntWidth = Context.Target.getIntWidth(); 1741 1742 // Verify that all the values are okay, compute the size of the values, and 1743 // reverse the list. 1744 unsigned NumNegativeBits = 0; 1745 unsigned NumPositiveBits = 0; 1746 1747 // Keep track of whether all elements have type int. 1748 bool AllElementsInt = true; 1749 1750 EnumConstantDecl *EltList = 0; 1751 for (unsigned i = 0; i != NumElements; ++i) { 1752 EnumConstantDecl *ECD = 1753 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1754 if (!ECD) continue; // Already issued a diagnostic. 1755 1756 // If the enum value doesn't fit in an int, emit an extension warning. 1757 const llvm::APSInt &InitVal = ECD->getInitVal(); 1758 assert(InitVal.getBitWidth() >= IntWidth && 1759 "Should have promoted value to int"); 1760 if (InitVal.getBitWidth() > IntWidth) { 1761 llvm::APSInt V(InitVal); 1762 V.trunc(IntWidth); 1763 V.extend(InitVal.getBitWidth()); 1764 if (V != InitVal) 1765 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1766 InitVal.toString()); 1767 } 1768 1769 // Keep track of the size of positive and negative values. 1770 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1771 NumPositiveBits = std::max(NumPositiveBits, 1772 (unsigned)InitVal.getActiveBits()); 1773 else 1774 NumNegativeBits = std::max(NumNegativeBits, 1775 (unsigned)InitVal.getMinSignedBits()); 1776 1777 // Keep track of whether every enum element has type int (very commmon). 1778 if (AllElementsInt) 1779 AllElementsInt = ECD->getType() == Context.IntTy; 1780 1781 ECD->setNextDeclarator(EltList); 1782 EltList = ECD; 1783 } 1784 1785 // Figure out the type that should be used for this enum. 1786 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1787 QualType BestType; 1788 unsigned BestWidth; 1789 1790 if (NumNegativeBits) { 1791 // If there is a negative value, figure out the smallest integer type (of 1792 // int/long/longlong) that fits. 1793 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1794 BestType = Context.IntTy; 1795 BestWidth = IntWidth; 1796 } else { 1797 BestWidth = Context.Target.getLongWidth(); 1798 1799 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1800 BestType = Context.LongTy; 1801 else { 1802 BestWidth = Context.Target.getLongLongWidth(); 1803 1804 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1805 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1806 BestType = Context.LongLongTy; 1807 } 1808 } 1809 } else { 1810 // If there is no negative value, figure out which of uint, ulong, ulonglong 1811 // fits. 1812 if (NumPositiveBits <= IntWidth) { 1813 BestType = Context.UnsignedIntTy; 1814 BestWidth = IntWidth; 1815 } else if (NumPositiveBits <= 1816 (BestWidth = Context.Target.getLongWidth())) { 1817 BestType = Context.UnsignedLongTy; 1818 } else { 1819 BestWidth = Context.Target.getLongLongWidth(); 1820 assert(NumPositiveBits <= BestWidth && 1821 "How could an initializer get larger than ULL?"); 1822 BestType = Context.UnsignedLongLongTy; 1823 } 1824 } 1825 1826 // Loop over all of the enumerator constants, changing their types to match 1827 // the type of the enum if needed. 1828 for (unsigned i = 0; i != NumElements; ++i) { 1829 EnumConstantDecl *ECD = 1830 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1831 if (!ECD) continue; // Already issued a diagnostic. 1832 1833 // Standard C says the enumerators have int type, but we allow, as an 1834 // extension, the enumerators to be larger than int size. If each 1835 // enumerator value fits in an int, type it as an int, otherwise type it the 1836 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1837 // that X has type 'int', not 'unsigned'. 1838 if (ECD->getType() == Context.IntTy) { 1839 // Make sure the init value is signed. 1840 llvm::APSInt IV = ECD->getInitVal(); 1841 IV.setIsSigned(true); 1842 ECD->setInitVal(IV); 1843 continue; // Already int type. 1844 } 1845 1846 // Determine whether the value fits into an int. 1847 llvm::APSInt InitVal = ECD->getInitVal(); 1848 bool FitsInInt; 1849 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1850 FitsInInt = InitVal.getActiveBits() < IntWidth; 1851 else 1852 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1853 1854 // If it fits into an integer type, force it. Otherwise force it to match 1855 // the enum decl type. 1856 QualType NewTy; 1857 unsigned NewWidth; 1858 bool NewSign; 1859 if (FitsInInt) { 1860 NewTy = Context.IntTy; 1861 NewWidth = IntWidth; 1862 NewSign = true; 1863 } else if (ECD->getType() == BestType) { 1864 // Already the right type! 1865 continue; 1866 } else { 1867 NewTy = BestType; 1868 NewWidth = BestWidth; 1869 NewSign = BestType->isSignedIntegerType(); 1870 } 1871 1872 // Adjust the APSInt value. 1873 InitVal.extOrTrunc(NewWidth); 1874 InitVal.setIsSigned(NewSign); 1875 ECD->setInitVal(InitVal); 1876 1877 // Adjust the Expr initializer and type. 1878 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1879 ECD->setType(NewTy); 1880 } 1881 1882 Enum->defineElements(EltList, BestType); 1883 Consumer.HandleTagDeclDefinition(Enum); 1884} 1885 1886Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1887 ExprTy *expr) { 1888 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1889 1890 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1891} 1892 1893Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1894 SourceLocation LBrace, 1895 SourceLocation RBrace, 1896 const char *Lang, 1897 unsigned StrSize, 1898 DeclTy *D) { 1899 LinkageSpecDecl::LanguageIDs Language; 1900 Decl *dcl = static_cast<Decl *>(D); 1901 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1902 Language = LinkageSpecDecl::lang_c; 1903 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1904 Language = LinkageSpecDecl::lang_cxx; 1905 else { 1906 Diag(Loc, diag::err_bad_language); 1907 return 0; 1908 } 1909 1910 // FIXME: Add all the various semantics of linkage specifications 1911 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1912} 1913 1914void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1915 1916 switch (Attr->getKind()) { 1917 case AttributeList::AT_vector_size: 1918 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1919 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1920 if (!newType.isNull()) // install the new vector type into the decl 1921 vDecl->setType(newType); 1922 } 1923 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1924 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1925 Attr); 1926 if (!newType.isNull()) // install the new vector type into the decl 1927 tDecl->setUnderlyingType(newType); 1928 } 1929 break; 1930 case AttributeList::AT_ocu_vector_type: 1931 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1932 HandleOCUVectorTypeAttribute(tDecl, Attr); 1933 else 1934 Diag(Attr->getLoc(), 1935 diag::err_typecheck_ocu_vector_not_typedef); 1936 break; 1937 case AttributeList::AT_address_space: 1938 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1939 QualType newType = HandleAddressSpaceTypeAttribute( 1940 tDecl->getUnderlyingType(), 1941 Attr); 1942 tDecl->setUnderlyingType(newType); 1943 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1944 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1945 Attr); 1946 // install the new addr spaced type into the decl 1947 vDecl->setType(newType); 1948 } 1949 break; 1950 case AttributeList::AT_deprecated: 1951 HandleDeprecatedAttribute(New, Attr); 1952 break; 1953 case AttributeList::AT_visibility: 1954 HandleVisibilityAttribute(New, Attr); 1955 break; 1956 case AttributeList::AT_weak: 1957 HandleWeakAttribute(New, Attr); 1958 break; 1959 case AttributeList::AT_dllimport: 1960 HandleDLLImportAttribute(New, Attr); 1961 break; 1962 case AttributeList::AT_dllexport: 1963 HandleDLLExportAttribute(New, Attr); 1964 break; 1965 case AttributeList::AT_nothrow: 1966 HandleNothrowAttribute(New, Attr); 1967 break; 1968 case AttributeList::AT_stdcall: 1969 HandleStdCallAttribute(New, Attr); 1970 break; 1971 case AttributeList::AT_fastcall: 1972 HandleFastCallAttribute(New, Attr); 1973 break; 1974 case AttributeList::AT_aligned: 1975 HandleAlignedAttribute(New, Attr); 1976 break; 1977 case AttributeList::AT_packed: 1978 HandlePackedAttribute(New, Attr); 1979 break; 1980 case AttributeList::AT_annotate: 1981 HandleAnnotateAttribute(New, Attr); 1982 break; 1983 case AttributeList::AT_noreturn: 1984 HandleNoReturnAttribute(New, Attr); 1985 break; 1986 case AttributeList::AT_format: 1987 HandleFormatAttribute(New, Attr); 1988 break; 1989 default: 1990#if 0 1991 // TODO: when we have the full set of attributes, warn about unknown ones. 1992 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1993 Attr->getName()->getName()); 1994#endif 1995 break; 1996 } 1997} 1998 1999void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 2000 AttributeList *declarator_postfix) { 2001 while (declspec_prefix) { 2002 HandleDeclAttribute(New, declspec_prefix); 2003 declspec_prefix = declspec_prefix->getNext(); 2004 } 2005 while (declarator_postfix) { 2006 HandleDeclAttribute(New, declarator_postfix); 2007 declarator_postfix = declarator_postfix->getNext(); 2008 } 2009} 2010 2011void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 2012 AttributeList *rawAttr) { 2013 QualType curType = tDecl->getUnderlyingType(); 2014 // check the attribute arguments. 2015 if (rawAttr->getNumArgs() != 1) { 2016 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2017 std::string("1")); 2018 return; 2019 } 2020 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2021 llvm::APSInt vecSize(32); 2022 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2023 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2024 "ocu_vector_type", sizeExpr->getSourceRange()); 2025 return; 2026 } 2027 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 2028 // in conjunction with complex types (pointers, arrays, functions, etc.). 2029 Type *canonType = curType.getCanonicalType().getTypePtr(); 2030 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2031 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2032 curType.getCanonicalType().getAsString()); 2033 return; 2034 } 2035 // unlike gcc's vector_size attribute, the size is specified as the 2036 // number of elements, not the number of bytes. 2037 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 2038 2039 if (vectorSize == 0) { 2040 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2041 sizeExpr->getSourceRange()); 2042 return; 2043 } 2044 // Instantiate/Install the vector type, the number of elements is > 0. 2045 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 2046 // Remember this typedef decl, we will need it later for diagnostics. 2047 OCUVectorDecls.push_back(tDecl); 2048} 2049 2050QualType Sema::HandleVectorTypeAttribute(QualType curType, 2051 AttributeList *rawAttr) { 2052 // check the attribute arugments. 2053 if (rawAttr->getNumArgs() != 1) { 2054 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2055 std::string("1")); 2056 return QualType(); 2057 } 2058 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2059 llvm::APSInt vecSize(32); 2060 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2061 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2062 "vector_size", sizeExpr->getSourceRange()); 2063 return QualType(); 2064 } 2065 // navigate to the base type - we need to provide for vector pointers, 2066 // vector arrays, and functions returning vectors. 2067 Type *canonType = curType.getCanonicalType().getTypePtr(); 2068 2069 if (canonType->isPointerType() || canonType->isArrayType() || 2070 canonType->isFunctionType()) { 2071 assert(0 && "HandleVector(): Complex type construction unimplemented"); 2072 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 2073 do { 2074 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 2075 canonType = PT->getPointeeType().getTypePtr(); 2076 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 2077 canonType = AT->getElementType().getTypePtr(); 2078 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 2079 canonType = FT->getResultType().getTypePtr(); 2080 } while (canonType->isPointerType() || canonType->isArrayType() || 2081 canonType->isFunctionType()); 2082 */ 2083 } 2084 // the base type must be integer or float. 2085 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2086 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2087 curType.getCanonicalType().getAsString()); 2088 return QualType(); 2089 } 2090 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 2091 // vecSize is specified in bytes - convert to bits. 2092 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 2093 2094 // the vector size needs to be an integral multiple of the type size. 2095 if (vectorSize % typeSize) { 2096 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 2097 sizeExpr->getSourceRange()); 2098 return QualType(); 2099 } 2100 if (vectorSize == 0) { 2101 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2102 sizeExpr->getSourceRange()); 2103 return QualType(); 2104 } 2105 // Instantiate the vector type, the number of elements is > 0, and not 2106 // required to be a power of 2, unlike GCC. 2107 return Context.getVectorType(curType, vectorSize/typeSize); 2108} 2109 2110void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 2111 // check the attribute arguments. 2112 if (rawAttr->getNumArgs() > 0) { 2113 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2114 std::string("0")); 2115 return; 2116 } 2117 2118 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 2119 TD->addAttr(new PackedAttr); 2120 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 2121 // If the alignment is less than or equal to 8 bits, the packed attribute 2122 // has no effect. 2123 if (Context.getTypeAlign(FD->getType()) <= 8) 2124 Diag(rawAttr->getLoc(), 2125 diag::warn_attribute_ignored_for_field_of_type, 2126 rawAttr->getName()->getName(), FD->getType().getAsString()); 2127 else 2128 FD->addAttr(new PackedAttr); 2129 } else 2130 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2131 rawAttr->getName()->getName()); 2132} 2133 2134void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2135 // check the attribute arguments. 2136 if (rawAttr->getNumArgs() != 0) { 2137 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2138 std::string("0")); 2139 return; 2140 } 2141 2142 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2143 2144 if (!Fn) { 2145 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2146 "noreturn", "function"); 2147 return; 2148 } 2149 2150 d->addAttr(new NoReturnAttr()); 2151} 2152 2153void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2154 // check the attribute arguments. 2155 if (rawAttr->getNumArgs() != 0) { 2156 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2157 std::string("0")); 2158 return; 2159 } 2160 2161 d->addAttr(new DeprecatedAttr()); 2162} 2163 2164void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2165 // check the attribute arguments. 2166 if (rawAttr->getNumArgs() != 1) { 2167 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2168 std::string("1")); 2169 return; 2170 } 2171 2172 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2173 Arg = Arg->IgnoreParenCasts(); 2174 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2175 2176 if (Str == 0 || Str->isWide()) { 2177 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2178 "visibility", std::string("1")); 2179 return; 2180 } 2181 2182 const char *TypeStr = Str->getStrData(); 2183 unsigned TypeLen = Str->getByteLength(); 2184 llvm::GlobalValue::VisibilityTypes type; 2185 2186 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2187 type = llvm::GlobalValue::DefaultVisibility; 2188 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2189 type = llvm::GlobalValue::HiddenVisibility; 2190 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2191 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2192 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2193 type = llvm::GlobalValue::ProtectedVisibility; 2194 else { 2195 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2196 "visibility", TypeStr); 2197 return; 2198 } 2199 2200 d->addAttr(new VisibilityAttr(type)); 2201} 2202 2203void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2204 // check the attribute arguments. 2205 if (rawAttr->getNumArgs() != 0) { 2206 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2207 std::string("0")); 2208 return; 2209 } 2210 2211 d->addAttr(new WeakAttr()); 2212} 2213 2214void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2215 // check the attribute arguments. 2216 if (rawAttr->getNumArgs() != 0) { 2217 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2218 std::string("0")); 2219 return; 2220 } 2221 2222 d->addAttr(new DLLImportAttr()); 2223} 2224 2225void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2226 // check the attribute arguments. 2227 if (rawAttr->getNumArgs() != 0) { 2228 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2229 std::string("0")); 2230 return; 2231 } 2232 2233 d->addAttr(new DLLExportAttr()); 2234} 2235 2236void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2237 // check the attribute arguments. 2238 if (rawAttr->getNumArgs() != 0) { 2239 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2240 std::string("0")); 2241 return; 2242 } 2243 2244 d->addAttr(new StdCallAttr()); 2245} 2246 2247void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2248 // check the attribute arguments. 2249 if (rawAttr->getNumArgs() != 0) { 2250 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2251 std::string("0")); 2252 return; 2253 } 2254 2255 d->addAttr(new FastCallAttr()); 2256} 2257 2258void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2259 // check the attribute arguments. 2260 if (rawAttr->getNumArgs() != 0) { 2261 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2262 std::string("0")); 2263 return; 2264 } 2265 2266 d->addAttr(new NoThrowAttr()); 2267} 2268 2269static const FunctionTypeProto *getFunctionProto(Decl *d) { 2270 ValueDecl *decl = dyn_cast<ValueDecl>(d); 2271 if (!decl) return 0; 2272 2273 QualType Ty = decl->getType(); 2274 2275 if (Ty->isFunctionPointerType()) { 2276 const PointerType *PtrTy = Ty->getAsPointerType(); 2277 Ty = PtrTy->getPointeeType(); 2278 } 2279 2280 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2281 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2282 2283 return 0; 2284} 2285 2286 2287/// Handle __attribute__((format(type,idx,firstarg))) attributes 2288/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2289void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2290 2291 if (!rawAttr->getParameterName()) { 2292 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2293 "format", std::string("1")); 2294 return; 2295 } 2296 2297 if (rawAttr->getNumArgs() != 2) { 2298 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2299 std::string("3")); 2300 return; 2301 } 2302 2303 // GCC ignores the format attribute on K&R style function 2304 // prototypes, so we ignore it as well 2305 const FunctionTypeProto *proto = getFunctionProto(d); 2306 2307 if (!proto) { 2308 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2309 "format", "function"); 2310 return; 2311 } 2312 2313 // FIXME: in C++ the implicit 'this' function parameter also counts. 2314 // this is needed in order to be compatible with GCC 2315 // the index must start in 1 and the limit is numargs+1 2316 unsigned NumArgs = proto->getNumArgs(); 2317 unsigned FirstIdx = 1; 2318 2319 const char *Format = rawAttr->getParameterName()->getName(); 2320 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2321 2322 // Normalize the argument, __foo__ becomes foo. 2323 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2324 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2325 Format += 2; 2326 FormatLen -= 4; 2327 } 2328 2329 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2330 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2331 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2332 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2333 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2334 "format", rawAttr->getParameterName()->getName()); 2335 return; 2336 } 2337 2338 // checks for the 2nd argument 2339 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2340 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2341 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2342 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2343 "format", std::string("2"), IdxExpr->getSourceRange()); 2344 return; 2345 } 2346 2347 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2348 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2349 "format", std::string("2"), IdxExpr->getSourceRange()); 2350 return; 2351 } 2352 2353 // make sure the format string is really a string 2354 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2355 if (!Ty->isPointerType() || 2356 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2357 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2358 IdxExpr->getSourceRange()); 2359 return; 2360 } 2361 2362 2363 // check the 3rd argument 2364 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2365 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2366 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2367 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2368 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2369 return; 2370 } 2371 2372 // check if the function is variadic if the 3rd argument non-zero 2373 if (FirstArg != 0) { 2374 if (proto->isVariadic()) { 2375 ++NumArgs; // +1 for ... 2376 } else { 2377 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2378 return; 2379 } 2380 } 2381 2382 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2383 // the input is just the current time + the format string 2384 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2385 if (FirstArg != 0) { 2386 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2387 FirstArgExpr->getSourceRange()); 2388 return; 2389 } 2390 // if 0 it disables parameter checking (to use with e.g. va_list) 2391 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2392 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2393 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2394 return; 2395 } 2396 2397 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2398 Idx.getZExtValue(), FirstArg.getZExtValue())); 2399} 2400 2401void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2402 // check the attribute arguments. 2403 if (rawAttr->getNumArgs() != 1) { 2404 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2405 std::string("1")); 2406 return; 2407 } 2408 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2409 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2410 2411 // Make sure that there is a string literal as the annotation's single 2412 // argument. 2413 if (!SE) { 2414 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2415 return; 2416 } 2417 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2418 SE->getByteLength()))); 2419} 2420 2421void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2422{ 2423 // check the attribute arguments. 2424 if (rawAttr->getNumArgs() > 1) { 2425 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2426 std::string("1")); 2427 return; 2428 } 2429 2430 unsigned Align = 0; 2431 2432 if (rawAttr->getNumArgs() == 0) { 2433 // FIXME: This should be the target specific maximum alignment. 2434 // (For now we just use 128 bits which is the maximum on X86. 2435 Align = 128; 2436 return; 2437 } else { 2438 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2439 llvm::APSInt alignment(32); 2440 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2441 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2442 "aligned", alignmentExpr->getSourceRange()); 2443 return; 2444 } 2445 2446 Align = alignment.getZExtValue() * 8; 2447 } 2448 2449 d->addAttr(new AlignedAttr(Align)); 2450} 2451