SemaDecl.cpp revision ff898cd0b0c9fcbad1033e0278b54a4cc7108d05
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, 170 Context.getTranslationUnitDecl(), 171 SourceLocation(), II, R, 172 FunctionDecl::Extern, false, 0); 173 174 // TUScope is the translation-unit scope to insert this function into. 175 TUScope->AddDecl(New); 176 177 // Add this decl to the end of the identifier info. 178 IdResolver.AddGlobalDecl(New); 179 180 return New; 181} 182 183/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 184/// and scope as a previous declaration 'Old'. Figure out how to resolve this 185/// situation, merging decls or emitting diagnostics as appropriate. 186/// 187TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 188 // Verify the old decl was also a typedef. 189 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 190 if (!Old) { 191 Diag(New->getLocation(), diag::err_redefinition_different_kind, 192 New->getName()); 193 Diag(OldD->getLocation(), diag::err_previous_definition); 194 return New; 195 } 196 197 // Allow multiple definitions for ObjC built-in typedefs. 198 // FIXME: Verify the underlying types are equivalent! 199 if (getLangOptions().ObjC1 && isBuiltinObjCType(New)) 200 return Old; 201 202 // Redeclaration of a type is a constraint violation (6.7.2.3p1). 203 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 204 // *either* declaration is in a system header. The code below implements 205 // this adhoc compatibility rule. FIXME: The following code will not 206 // work properly when compiling ".i" files (containing preprocessed output). 207 SourceManager &SrcMgr = Context.getSourceManager(); 208 const FileEntry *OldDeclFile = SrcMgr.getFileEntryForLoc(Old->getLocation()); 209 const FileEntry *NewDeclFile = SrcMgr.getFileEntryForLoc(New->getLocation()); 210 HeaderSearch &HdrInfo = PP.getHeaderSearchInfo(); 211 DirectoryLookup::DirType OldDirType = HdrInfo.getFileDirFlavor(OldDeclFile); 212 DirectoryLookup::DirType NewDirType = HdrInfo.getFileDirFlavor(NewDeclFile); 213 214 // Allow reclarations in both SystemHeaderDir and ExternCSystemHeaderDir. 215 if ((OldDirType != DirectoryLookup::NormalHeaderDir || 216 NewDirType != DirectoryLookup::NormalHeaderDir) || 217 getLangOptions().Microsoft) 218 return New; 219 220 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 221 // TODO: This is totally simplistic. It should handle merging functions 222 // together etc, merging extern int X; int X; ... 223 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 224 Diag(Old->getLocation(), diag::err_previous_definition); 225 return New; 226} 227 228/// DeclhasAttr - returns true if decl Declaration already has the target attribute. 229static bool DeclHasAttr(const Decl *decl, const Attr *target) { 230 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 231 if (attr->getKind() == target->getKind()) 232 return true; 233 234 return false; 235} 236 237/// MergeAttributes - append attributes from the Old decl to the New one. 238static void MergeAttributes(Decl *New, Decl *Old) { 239 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 240 241// FIXME: fix this code to cleanup the Old attrs correctly 242 while (attr) { 243 tmp = attr; 244 attr = attr->getNext(); 245 246 if (!DeclHasAttr(New, tmp)) { 247 New->addAttr(tmp); 248 } else { 249 tmp->setNext(0); 250 delete(tmp); 251 } 252 } 253} 254 255/// MergeFunctionDecl - We just parsed a function 'New' from 256/// declarator D which has the same name and scope as a previous 257/// declaration 'Old'. Figure out how to resolve this situation, 258/// merging decls or emitting diagnostics as appropriate. 259/// 260FunctionDecl *Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 261 // Verify the old decl was also a function. 262 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 263 if (!Old) { 264 Diag(New->getLocation(), diag::err_redefinition_different_kind, 265 New->getName()); 266 Diag(OldD->getLocation(), diag::err_previous_definition); 267 return New; 268 } 269 270 MergeAttributes(New, Old); 271 272 QualType OldQType = Context.getCanonicalType(Old->getType()); 273 QualType NewQType = Context.getCanonicalType(New->getType()); 274 275 // C++ [dcl.fct]p3: 276 // All declarations for a function shall agree exactly in both the 277 // return type and the parameter-type-list. 278 if (getLangOptions().CPlusPlus && OldQType == NewQType) 279 return MergeCXXFunctionDecl(New, Old); 280 281 // C: Function types need to be compatible, not identical. This handles 282 // duplicate function decls like "void f(int); void f(enum X);" properly. 283 if (!getLangOptions().CPlusPlus && 284 Context.functionTypesAreCompatible(OldQType, NewQType)) { 285 return New; 286 } 287 288 // A function that has already been declared has been redeclared or defined 289 // with a different type- show appropriate diagnostic 290 diag::kind PrevDiag; 291 if (Old->getBody()) 292 PrevDiag = diag::err_previous_definition; 293 else if (Old->isImplicit()) 294 PrevDiag = diag::err_previous_implicit_declaration; 295 else 296 PrevDiag = diag::err_previous_declaration; 297 298 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 299 // TODO: This is totally simplistic. It should handle merging functions 300 // together etc, merging extern int X; int X; ... 301 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 302 Diag(Old->getLocation(), PrevDiag); 303 return New; 304} 305 306/// equivalentArrayTypes - Used to determine whether two array types are 307/// equivalent. 308/// We need to check this explicitly as an incomplete array definition is 309/// considered a VariableArrayType, so will not match a complete array 310/// definition that would be otherwise equivalent. 311static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 312 const ArrayType *NewAT = NewQType->getAsArrayType(); 313 const ArrayType *OldAT = OldQType->getAsArrayType(); 314 315 if (!NewAT || !OldAT) 316 return false; 317 318 // If either (or both) array types in incomplete we need to strip off the 319 // outer VariableArrayType. Once the outer VAT is removed the remaining 320 // types must be identical if the array types are to be considered 321 // equivalent. 322 // eg. int[][1] and int[1][1] become 323 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 324 // removing the outermost VAT gives 325 // CAT(1, int) and CAT(1, int) 326 // which are equal, therefore the array types are equivalent. 327 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 328 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 329 return false; 330 NewQType = NewAT->getElementType().getCanonicalType(); 331 OldQType = OldAT->getElementType().getCanonicalType(); 332 } 333 334 return NewQType == OldQType; 335} 336 337/// MergeVarDecl - We just parsed a variable 'New' which has the same name 338/// and scope as a previous declaration 'Old'. Figure out how to resolve this 339/// situation, merging decls or emitting diagnostics as appropriate. 340/// 341/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 342/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 343/// 344VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 345 // Verify the old decl was also a variable. 346 VarDecl *Old = dyn_cast<VarDecl>(OldD); 347 if (!Old) { 348 Diag(New->getLocation(), diag::err_redefinition_different_kind, 349 New->getName()); 350 Diag(OldD->getLocation(), diag::err_previous_definition); 351 return New; 352 } 353 354 MergeAttributes(New, Old); 355 356 // Verify the types match. 357 QualType OldCType = Context.getCanonicalType(Old->getType()); 358 QualType NewCType = Context.getCanonicalType(New->getType()); 359 if (OldCType != NewCType && !areEquivalentArrayTypes(NewCType, OldCType)) { 360 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 361 Diag(Old->getLocation(), diag::err_previous_definition); 362 return New; 363 } 364 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 365 if (New->getStorageClass() == VarDecl::Static && 366 (Old->getStorageClass() == VarDecl::None || 367 Old->getStorageClass() == VarDecl::Extern)) { 368 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 369 Diag(Old->getLocation(), diag::err_previous_definition); 370 return New; 371 } 372 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 373 if (New->getStorageClass() != VarDecl::Static && 374 Old->getStorageClass() == VarDecl::Static) { 375 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 376 Diag(Old->getLocation(), diag::err_previous_definition); 377 return New; 378 } 379 // We've verified the types match, now handle "tentative" definitions. 380 if (Old->isFileVarDecl() && New->isFileVarDecl()) { 381 // Handle C "tentative" external object definitions (C99 6.9.2). 382 bool OldIsTentative = false; 383 bool NewIsTentative = false; 384 385 if (!Old->getInit() && 386 (Old->getStorageClass() == VarDecl::None || 387 Old->getStorageClass() == VarDecl::Static)) 388 OldIsTentative = true; 389 390 // FIXME: this check doesn't work (since the initializer hasn't been 391 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 392 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 393 // thrown out the old decl. 394 if (!New->getInit() && 395 (New->getStorageClass() == VarDecl::None || 396 New->getStorageClass() == VarDecl::Static)) 397 ; // change to NewIsTentative = true; once the code is moved. 398 399 if (NewIsTentative || OldIsTentative) 400 return New; 401 } 402 if (Old->getStorageClass() != VarDecl::Extern && 403 New->getStorageClass() != VarDecl::Extern) { 404 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 405 Diag(Old->getLocation(), diag::err_previous_definition); 406 } 407 return New; 408} 409 410/// CheckParmsForFunctionDef - Check that the parameters of the given 411/// function are appropriate for the definition of a function. This 412/// takes care of any checks that cannot be performed on the 413/// declaration itself, e.g., that the types of each of the function 414/// parameters are complete. 415bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 416 bool HasInvalidParm = false; 417 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 418 ParmVarDecl *Param = FD->getParamDecl(p); 419 420 // C99 6.7.5.3p4: the parameters in a parameter type list in a 421 // function declarator that is part of a function definition of 422 // that function shall not have incomplete type. 423 if (Param->getType()->isIncompleteType() && 424 !Param->isInvalidDecl()) { 425 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type, 426 Param->getType().getAsString()); 427 Param->setInvalidDecl(); 428 HasInvalidParm = true; 429 } 430 } 431 432 return HasInvalidParm; 433} 434 435/// CreateImplicitParameter - Creates an implicit function parameter 436/// in the scope S and with the given type. This routine is used, for 437/// example, to create the implicit "self" parameter in an Objective-C 438/// method. 439ParmVarDecl * 440Sema::CreateImplicitParameter(Scope *S, IdentifierInfo *Id, 441 SourceLocation IdLoc, QualType Type) { 442 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, IdLoc, Id, Type, 443 VarDecl::None, 0, 0); 444 if (Id) 445 PushOnScopeChains(New, S); 446 447 return New; 448} 449 450/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 451/// no declarator (e.g. "struct foo;") is parsed. 452Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 453 // TODO: emit error on 'int;' or 'const enum foo;'. 454 // TODO: emit error on 'typedef int;' 455 // if (!DS.isMissingDeclaratorOk()) Diag(...); 456 457 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 458} 459 460bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 461 // Get the type before calling CheckSingleAssignmentConstraints(), since 462 // it can promote the expression. 463 QualType InitType = Init->getType(); 464 465 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 466 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 467 InitType, Init, "initializing"); 468} 469 470bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 471 QualType ElementType) { 472 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 473 if (CheckSingleInitializer(expr, ElementType)) 474 return true; // types weren't compatible. 475 476 if (savExpr != expr) // The type was promoted, update initializer list. 477 IList->setInit(slot, expr); 478 return false; 479} 480 481bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 482 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 483 // C99 6.7.8p14. We have an array of character type with unknown size 484 // being initialized to a string literal. 485 llvm::APSInt ConstVal(32); 486 ConstVal = strLiteral->getByteLength() + 1; 487 // Return a new array type (C99 6.7.8p22). 488 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 489 ArrayType::Normal, 0); 490 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 491 // C99 6.7.8p14. We have an array of character type with known size. 492 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 493 Diag(strLiteral->getSourceRange().getBegin(), 494 diag::warn_initializer_string_for_char_array_too_long, 495 strLiteral->getSourceRange()); 496 } else { 497 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 498 } 499 // Set type from "char *" to "constant array of char". 500 strLiteral->setType(DeclT); 501 // For now, we always return false (meaning success). 502 return false; 503} 504 505StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 506 const ArrayType *AT = DeclType->getAsArrayType(); 507 if (AT && AT->getElementType()->isCharType()) { 508 return dyn_cast<StringLiteral>(Init); 509 } 510 return 0; 511} 512 513// CheckInitializerListTypes - Checks the types of elements of an initializer 514// list. This function is recursive: it calls itself to initialize subelements 515// of aggregate types. Note that the topLevel parameter essentially refers to 516// whether this expression "owns" the initializer list passed in, or if this 517// initialization is taking elements out of a parent initializer. Each 518// call to this function adds zero or more to startIndex, reports any errors, 519// and returns true if it found any inconsistent types. 520bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 521 bool topLevel, unsigned& startIndex) { 522 bool hadError = false; 523 524 if (DeclType->isScalarType()) { 525 // The simplest case: initializing a single scalar 526 if (topLevel) { 527 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 528 IList->getSourceRange()); 529 } 530 if (startIndex < IList->getNumInits()) { 531 Expr* expr = IList->getInit(startIndex); 532 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 533 // FIXME: Should an error be reported here instead? 534 unsigned newIndex = 0; 535 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 536 } else { 537 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 538 } 539 ++startIndex; 540 } 541 // FIXME: Should an error be reported for empty initializer list + scalar? 542 } else if (DeclType->isVectorType()) { 543 if (startIndex < IList->getNumInits()) { 544 const VectorType *VT = DeclType->getAsVectorType(); 545 int maxElements = VT->getNumElements(); 546 QualType elementType = VT->getElementType(); 547 548 for (int i = 0; i < maxElements; ++i) { 549 // Don't attempt to go past the end of the init list 550 if (startIndex >= IList->getNumInits()) 551 break; 552 Expr* expr = IList->getInit(startIndex); 553 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 554 unsigned newIndex = 0; 555 hadError |= CheckInitializerListTypes(SubInitList, elementType, 556 true, newIndex); 557 ++startIndex; 558 } else { 559 hadError |= CheckInitializerListTypes(IList, elementType, 560 false, startIndex); 561 } 562 } 563 } 564 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 565 if (DeclType->isStructureType() || DeclType->isUnionType()) { 566 if (startIndex < IList->getNumInits() && !topLevel && 567 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 568 DeclType)) { 569 // We found a compatible struct; per the standard, this initializes the 570 // struct. (The C standard technically says that this only applies for 571 // initializers for declarations with automatic scope; however, this 572 // construct is unambiguous anyway because a struct cannot contain 573 // a type compatible with itself. We'll output an error when we check 574 // if the initializer is constant.) 575 // FIXME: Is a call to CheckSingleInitializer required here? 576 ++startIndex; 577 } else { 578 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 579 580 // If the record is invalid, some of it's members are invalid. To avoid 581 // confusion, we forgo checking the intializer for the entire record. 582 if (structDecl->isInvalidDecl()) 583 return true; 584 585 // If structDecl is a forward declaration, this loop won't do anything; 586 // That's okay, because an error should get printed out elsewhere. It 587 // might be worthwhile to skip over the rest of the initializer, though. 588 int numMembers = structDecl->getNumMembers() - 589 structDecl->hasFlexibleArrayMember(); 590 for (int i = 0; i < numMembers; i++) { 591 // Don't attempt to go past the end of the init list 592 if (startIndex >= IList->getNumInits()) 593 break; 594 FieldDecl * curField = structDecl->getMember(i); 595 if (!curField->getIdentifier()) { 596 // Don't initialize unnamed fields, e.g. "int : 20;" 597 continue; 598 } 599 QualType fieldType = curField->getType(); 600 Expr* expr = IList->getInit(startIndex); 601 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 602 unsigned newStart = 0; 603 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 604 true, newStart); 605 ++startIndex; 606 } else { 607 hadError |= CheckInitializerListTypes(IList, fieldType, 608 false, startIndex); 609 } 610 if (DeclType->isUnionType()) 611 break; 612 } 613 // FIXME: Implement flexible array initialization GCC extension (it's a 614 // really messy extension to implement, unfortunately...the necessary 615 // information isn't actually even here!) 616 } 617 } else if (DeclType->isArrayType()) { 618 // Check for the special-case of initializing an array with a string. 619 if (startIndex < IList->getNumInits()) { 620 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 621 DeclType)) { 622 CheckStringLiteralInit(lit, DeclType); 623 ++startIndex; 624 if (topLevel && startIndex < IList->getNumInits()) { 625 // We have leftover initializers; warn 626 Diag(IList->getInit(startIndex)->getLocStart(), 627 diag::err_excess_initializers_in_char_array_initializer, 628 IList->getInit(startIndex)->getSourceRange()); 629 } 630 return false; 631 } 632 } 633 int maxElements; 634 if (DeclType->isIncompleteArrayType()) { 635 // FIXME: use a proper constant 636 maxElements = 0x7FFFFFFF; 637 } else if (const VariableArrayType *VAT = 638 DeclType->getAsVariableArrayType()) { 639 // Check for VLAs; in standard C it would be possible to check this 640 // earlier, but I don't know where clang accepts VLAs (gcc accepts 641 // them in all sorts of strange places). 642 Diag(VAT->getSizeExpr()->getLocStart(), 643 diag::err_variable_object_no_init, 644 VAT->getSizeExpr()->getSourceRange()); 645 hadError = true; 646 maxElements = 0x7FFFFFFF; 647 } else { 648 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 649 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 650 } 651 QualType elementType = DeclType->getAsArrayType()->getElementType(); 652 int numElements = 0; 653 for (int i = 0; i < maxElements; ++i, ++numElements) { 654 // Don't attempt to go past the end of the init list 655 if (startIndex >= IList->getNumInits()) 656 break; 657 Expr* expr = IList->getInit(startIndex); 658 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 659 unsigned newIndex = 0; 660 hadError |= CheckInitializerListTypes(SubInitList, elementType, 661 true, newIndex); 662 ++startIndex; 663 } else { 664 hadError |= CheckInitializerListTypes(IList, elementType, 665 false, startIndex); 666 } 667 } 668 if (DeclType->isIncompleteArrayType()) { 669 // If this is an incomplete array type, the actual type needs to 670 // be calculated here 671 if (numElements == 0) { 672 // Sizing an array implicitly to zero is not allowed 673 // (It could in theory be allowed, but it doesn't really matter.) 674 Diag(IList->getLocStart(), 675 diag::err_at_least_one_initializer_needed_to_size_array); 676 hadError = true; 677 } else { 678 llvm::APSInt ConstVal(32); 679 ConstVal = numElements; 680 DeclType = Context.getConstantArrayType(elementType, ConstVal, 681 ArrayType::Normal, 0); 682 } 683 } 684 } else { 685 assert(0 && "Aggregate that isn't a function or array?!"); 686 } 687 } else { 688 // In C, all types are either scalars or aggregates, but 689 // additional handling is needed here for C++ (and possibly others?). 690 assert(0 && "Unsupported initializer type"); 691 } 692 693 // If this init list is a base list, we set the type; an initializer doesn't 694 // fundamentally have a type, but this makes the ASTs a bit easier to read 695 if (topLevel) 696 IList->setType(DeclType); 697 698 if (topLevel && startIndex < IList->getNumInits()) { 699 // We have leftover initializers; warn 700 Diag(IList->getInit(startIndex)->getLocStart(), 701 diag::warn_excess_initializers, 702 IList->getInit(startIndex)->getSourceRange()); 703 } 704 return hadError; 705} 706 707bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 708 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 709 // of unknown size ("[]") or an object type that is not a variable array type. 710 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 711 return Diag(VAT->getSizeExpr()->getLocStart(), 712 diag::err_variable_object_no_init, 713 VAT->getSizeExpr()->getSourceRange()); 714 715 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 716 if (!InitList) { 717 // FIXME: Handle wide strings 718 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 719 return CheckStringLiteralInit(strLiteral, DeclType); 720 721 if (DeclType->isArrayType()) 722 return Diag(Init->getLocStart(), 723 diag::err_array_init_list_required, 724 Init->getSourceRange()); 725 726 return CheckSingleInitializer(Init, DeclType); 727 } 728 unsigned newIndex = 0; 729 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 730} 731 732Sema::DeclTy * 733Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 734 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 735 IdentifierInfo *II = D.getIdentifier(); 736 737 // All of these full declarators require an identifier. If it doesn't have 738 // one, the ParsedFreeStandingDeclSpec action should be used. 739 if (II == 0) { 740 Diag(D.getDeclSpec().getSourceRange().getBegin(), 741 diag::err_declarator_need_ident, 742 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 743 return 0; 744 } 745 746 // The scope passed in may not be a decl scope. Zip up the scope tree until 747 // we find one that is. 748 while ((S->getFlags() & Scope::DeclScope) == 0) 749 S = S->getParent(); 750 751 // See if this is a redefinition of a variable in the same scope. 752 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 753 ScopedDecl *New; 754 bool InvalidDecl = false; 755 756 // In C++, the previous declaration we find might be a tag type 757 // (class or enum). In this case, the new declaration will hide the 758 // tag type. 759 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 760 PrevDecl = 0; 761 762 QualType R = GetTypeForDeclarator(D, S); 763 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 764 765 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 766 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 767 if (!NewTD) return 0; 768 769 // Handle attributes prior to checking for duplicates in MergeVarDecl 770 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 771 D.getAttributes()); 772 // Merge the decl with the existing one if appropriate. If the decl is 773 // in an outer scope, it isn't the same thing. 774 if (PrevDecl && S->isDeclScope(PrevDecl)) { 775 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 776 if (NewTD == 0) return 0; 777 } 778 New = NewTD; 779 if (S->getParent() == 0) { 780 // C99 6.7.7p2: If a typedef name specifies a variably modified type 781 // then it shall have block scope. 782 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 783 // FIXME: Diagnostic needs to be fixed. 784 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 785 InvalidDecl = true; 786 } 787 } 788 } else if (R.getTypePtr()->isFunctionType()) { 789 FunctionDecl::StorageClass SC = FunctionDecl::None; 790 switch (D.getDeclSpec().getStorageClassSpec()) { 791 default: assert(0 && "Unknown storage class!"); 792 case DeclSpec::SCS_auto: 793 case DeclSpec::SCS_register: 794 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 795 R.getAsString()); 796 InvalidDecl = true; 797 break; 798 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 799 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 800 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 801 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 802 } 803 804 bool isInline = D.getDeclSpec().isInlineSpecified(); 805 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 806 D.getIdentifierLoc(), 807 II, R, SC, isInline, 808 LastDeclarator); 809 // Handle attributes. 810 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 811 D.getAttributes()); 812 813 // Copy the parameter declarations from the declarator D to 814 // the function declaration NewFD, if they are available. 815 if (D.getNumTypeObjects() > 0 && 816 D.getTypeObject(0).Fun.hasPrototype) { 817 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 818 819 // Create Decl objects for each parameter, adding them to the 820 // FunctionDecl. 821 llvm::SmallVector<ParmVarDecl*, 16> Params; 822 823 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 824 // function that takes no arguments, not a function that takes a 825 // single void argument. 826 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 827 FTI.ArgInfo[0].Param && 828 !((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 829 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 830 // empty arg list, don't push any params. 831 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 832 833 // In C++, the empty parameter-type-list must be spelled "void"; a 834 // typedef of void is not permitted. 835 if (getLangOptions().CPlusPlus && 836 Param->getType() != Context.VoidTy) { 837 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 838 } 839 840 } else { 841 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 842 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 843 } 844 845 NewFD->setParams(&Params[0], Params.size()); 846 } 847 848 // Merge the decl with the existing one if appropriate. Since C functions 849 // are in a flat namespace, make sure we consider decls in outer scopes. 850 if (PrevDecl) { 851 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 852 if (NewFD == 0) return 0; 853 } 854 New = NewFD; 855 856 // In C++, check default arguments now that we have merged decls. 857 if (getLangOptions().CPlusPlus) 858 CheckCXXDefaultArguments(NewFD); 859 } else { 860 if (R.getTypePtr()->isObjCInterfaceType()) { 861 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 862 D.getIdentifier()->getName()); 863 InvalidDecl = true; 864 } 865 866 VarDecl *NewVD; 867 VarDecl::StorageClass SC; 868 switch (D.getDeclSpec().getStorageClassSpec()) { 869 default: assert(0 && "Unknown storage class!"); 870 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 871 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 872 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 873 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 874 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 875 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 876 } 877 if (S->getParent() == 0) { 878 // C99 6.9p2: The storage-class specifiers auto and register shall not 879 // appear in the declaration specifiers in an external declaration. 880 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 881 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 882 R.getAsString()); 883 InvalidDecl = true; 884 } 885 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 886 II, R, SC, LastDeclarator); 887 } else { 888 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 889 II, R, SC, LastDeclarator); 890 } 891 // Handle attributes prior to checking for duplicates in MergeVarDecl 892 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 893 D.getAttributes()); 894 895 // Emit an error if an address space was applied to decl with local storage. 896 // This includes arrays of objects with address space qualifiers, but not 897 // automatic variables that point to other address spaces. 898 // ISO/IEC TR 18037 S5.1.2 899 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 900 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 901 InvalidDecl = true; 902 } 903 // Merge the decl with the existing one if appropriate. If the decl is 904 // in an outer scope, it isn't the same thing. 905 if (PrevDecl && S->isDeclScope(PrevDecl)) { 906 NewVD = MergeVarDecl(NewVD, PrevDecl); 907 if (NewVD == 0) return 0; 908 } 909 New = NewVD; 910 } 911 912 // If this has an identifier, add it to the scope stack. 913 if (II) 914 PushOnScopeChains(New, S); 915 // If any semantic error occurred, mark the decl as invalid. 916 if (D.getInvalidType() || InvalidDecl) 917 New->setInvalidDecl(); 918 919 return New; 920} 921 922bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 923 SourceLocation loc; 924 // FIXME: Remove the isReference check and handle assignment to a reference. 925 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 926 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 927 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 928 return true; 929 } 930 return false; 931} 932 933void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 934 Decl *RealDecl = static_cast<Decl *>(dcl); 935 Expr *Init = static_cast<Expr *>(init); 936 assert(Init && "missing initializer"); 937 938 // If there is no declaration, there was an error parsing it. Just ignore 939 // the initializer. 940 if (RealDecl == 0) { 941 delete Init; 942 return; 943 } 944 945 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 946 if (!VDecl) { 947 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 948 diag::err_illegal_initializer); 949 RealDecl->setInvalidDecl(); 950 return; 951 } 952 // Get the decls type and save a reference for later, since 953 // CheckInitializerTypes may change it. 954 QualType DclT = VDecl->getType(), SavT = DclT; 955 if (VDecl->isBlockVarDecl()) { 956 VarDecl::StorageClass SC = VDecl->getStorageClass(); 957 if (SC == VarDecl::Extern) { // C99 6.7.8p5 958 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 959 VDecl->setInvalidDecl(); 960 } else if (!VDecl->isInvalidDecl()) { 961 if (CheckInitializerTypes(Init, DclT)) 962 VDecl->setInvalidDecl(); 963 if (SC == VarDecl::Static) // C99 6.7.8p4. 964 CheckForConstantInitializer(Init, DclT); 965 } 966 } else if (VDecl->isFileVarDecl()) { 967 if (VDecl->getStorageClass() == VarDecl::Extern) 968 Diag(VDecl->getLocation(), diag::warn_extern_init); 969 if (!VDecl->isInvalidDecl()) 970 if (CheckInitializerTypes(Init, DclT)) 971 VDecl->setInvalidDecl(); 972 973 // C99 6.7.8p4. All file scoped initializers need to be constant. 974 CheckForConstantInitializer(Init, DclT); 975 } 976 // If the type changed, it means we had an incomplete type that was 977 // completed by the initializer. For example: 978 // int ary[] = { 1, 3, 5 }; 979 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 980 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 981 VDecl->setType(DclT); 982 Init->setType(DclT); 983 } 984 985 // Attach the initializer to the decl. 986 VDecl->setInit(Init); 987 return; 988} 989 990/// The declarators are chained together backwards, reverse the list. 991Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 992 // Often we have single declarators, handle them quickly. 993 Decl *GroupDecl = static_cast<Decl*>(group); 994 if (GroupDecl == 0) 995 return 0; 996 997 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 998 ScopedDecl *NewGroup = 0; 999 if (Group->getNextDeclarator() == 0) 1000 NewGroup = Group; 1001 else { // reverse the list. 1002 while (Group) { 1003 ScopedDecl *Next = Group->getNextDeclarator(); 1004 Group->setNextDeclarator(NewGroup); 1005 NewGroup = Group; 1006 Group = Next; 1007 } 1008 } 1009 // Perform semantic analysis that depends on having fully processed both 1010 // the declarator and initializer. 1011 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 1012 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 1013 if (!IDecl) 1014 continue; 1015 QualType T = IDecl->getType(); 1016 1017 // C99 6.7.5.2p2: If an identifier is declared to be an object with 1018 // static storage duration, it shall not have a variable length array. 1019 if ((IDecl->isFileVarDecl() || IDecl->isBlockVarDecl()) && 1020 IDecl->getStorageClass() == VarDecl::Static) { 1021 if (T->getAsVariableArrayType()) { 1022 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 1023 IDecl->setInvalidDecl(); 1024 } 1025 } 1026 // Block scope. C99 6.7p7: If an identifier for an object is declared with 1027 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 1028 if (IDecl->isBlockVarDecl() && 1029 IDecl->getStorageClass() != VarDecl::Extern) { 1030 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1031 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1032 T.getAsString()); 1033 IDecl->setInvalidDecl(); 1034 } 1035 } 1036 // File scope. C99 6.9.2p2: A declaration of an identifier for and 1037 // object that has file scope without an initializer, and without a 1038 // storage-class specifier or with the storage-class specifier "static", 1039 // constitutes a tentative definition. Note: A tentative definition with 1040 // external linkage is valid (C99 6.2.2p5). 1041 if (IDecl && !IDecl->getInit() && 1042 (IDecl->getStorageClass() == VarDecl::Static || 1043 IDecl->getStorageClass() == VarDecl::None)) { 1044 if (T->isIncompleteArrayType()) { 1045 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 1046 // array to be completed. Don't issue a diagnostic. 1047 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1048 // C99 6.9.2p3: If the declaration of an identifier for an object is 1049 // a tentative definition and has internal linkage (C99 6.2.2p3), the 1050 // declared type shall not be an incomplete type. 1051 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1052 T.getAsString()); 1053 IDecl->setInvalidDecl(); 1054 } 1055 } 1056 } 1057 return NewGroup; 1058} 1059 1060/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 1061/// to introduce parameters into function prototype scope. 1062Sema::DeclTy * 1063Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 1064 DeclSpec &DS = D.getDeclSpec(); 1065 1066 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 1067 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1068 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 1069 Diag(DS.getStorageClassSpecLoc(), 1070 diag::err_invalid_storage_class_in_func_decl); 1071 DS.ClearStorageClassSpecs(); 1072 } 1073 if (DS.isThreadSpecified()) { 1074 Diag(DS.getThreadSpecLoc(), 1075 diag::err_invalid_storage_class_in_func_decl); 1076 DS.ClearStorageClassSpecs(); 1077 } 1078 1079 1080 // In this context, we *do not* check D.getInvalidType(). If the declarator 1081 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 1082 // though it will not reflect the user specified type. 1083 QualType parmDeclType = GetTypeForDeclarator(D, S); 1084 1085 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 1086 1087 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 1088 // Can this happen for params? We already checked that they don't conflict 1089 // among each other. Here they can only shadow globals, which is ok. 1090 IdentifierInfo *II = D.getIdentifier(); 1091 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 1092 if (S->isDeclScope(PrevDecl)) { 1093 Diag(D.getIdentifierLoc(), diag::err_param_redefinition, 1094 dyn_cast<NamedDecl>(PrevDecl)->getName()); 1095 1096 // Recover by removing the name 1097 II = 0; 1098 D.SetIdentifier(0, D.getIdentifierLoc()); 1099 } 1100 } 1101 1102 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 1103 // Doing the promotion here has a win and a loss. The win is the type for 1104 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 1105 // code generator). The loss is the orginal type isn't preserved. For example: 1106 // 1107 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1108 // int blockvardecl[5]; 1109 // sizeof(parmvardecl); // size == 4 1110 // sizeof(blockvardecl); // size == 20 1111 // } 1112 // 1113 // For expressions, all implicit conversions are captured using the 1114 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1115 // 1116 // FIXME: If a source translation tool needs to see the original type, then 1117 // we need to consider storing both types (in ParmVarDecl)... 1118 // 1119 if (parmDeclType->isArrayType()) { 1120 // int x[restrict 4] -> int *restrict 1121 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1122 } else if (parmDeclType->isFunctionType()) 1123 parmDeclType = Context.getPointerType(parmDeclType); 1124 1125 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 1126 D.getIdentifierLoc(), II, 1127 parmDeclType, VarDecl::None, 1128 0, 0); 1129 1130 if (D.getInvalidType()) 1131 New->setInvalidDecl(); 1132 1133 if (II) 1134 PushOnScopeChains(New, S); 1135 1136 HandleDeclAttributes(New, D.getAttributes(), 0); 1137 return New; 1138 1139} 1140 1141Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1142 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1143 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1144 "Not a function declarator!"); 1145 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1146 1147 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1148 // for a K&R function. 1149 if (!FTI.hasPrototype) { 1150 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1151 if (FTI.ArgInfo[i].Param == 0) { 1152 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1153 FTI.ArgInfo[i].Ident->getName()); 1154 // Implicitly declare the argument as type 'int' for lack of a better 1155 // type. 1156 DeclSpec DS; 1157 const char* PrevSpec; // unused 1158 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 1159 PrevSpec); 1160 Declarator ParamD(DS, Declarator::KNRTypeListContext); 1161 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 1162 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 1163 } 1164 } 1165 1166 // Since this is a function definition, act as though we have information 1167 // about the arguments. 1168 if (FTI.NumArgs) 1169 FTI.hasPrototype = true; 1170 } else { 1171 // FIXME: Diagnose arguments without names in C. 1172 } 1173 1174 Scope *GlobalScope = FnBodyScope->getParent(); 1175 1176 // See if this is a redefinition. 1177 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1178 GlobalScope); 1179 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1180 if (FD->getBody()) { 1181 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1182 D.getIdentifier()->getName()); 1183 Diag(FD->getLocation(), diag::err_previous_definition); 1184 } 1185 } 1186 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1187 FunctionDecl *FD = cast<FunctionDecl>(decl); 1188 CurFunctionDecl = FD; 1189 PushDeclContext(FD); 1190 1191 // Check the validity of our function parameters 1192 CheckParmsForFunctionDef(FD); 1193 1194 // Introduce our parameters into the function scope 1195 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1196 ParmVarDecl *Param = FD->getParamDecl(p); 1197 // If this has an identifier, add it to the scope stack. 1198 if (Param->getIdentifier()) 1199 PushOnScopeChains(Param, FnBodyScope); 1200 } 1201 1202 return FD; 1203} 1204 1205Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1206 Decl *dcl = static_cast<Decl *>(D); 1207 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1208 FD->setBody((Stmt*)Body); 1209 assert(FD == CurFunctionDecl && "Function parsing confused"); 1210 CurFunctionDecl = 0; 1211 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1212 MD->setBody((Stmt*)Body); 1213 CurMethodDecl = 0; 1214 } 1215 PopDeclContext(); 1216 // Verify and clean out per-function state. 1217 1218 // Check goto/label use. 1219 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1220 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1221 // Verify that we have no forward references left. If so, there was a goto 1222 // or address of a label taken, but no definition of it. Label fwd 1223 // definitions are indicated with a null substmt. 1224 if (I->second->getSubStmt() == 0) { 1225 LabelStmt *L = I->second; 1226 // Emit error. 1227 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1228 1229 // At this point, we have gotos that use the bogus label. Stitch it into 1230 // the function body so that they aren't leaked and that the AST is well 1231 // formed. 1232 if (Body) { 1233 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1234 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1235 } else { 1236 // The whole function wasn't parsed correctly, just delete this. 1237 delete L; 1238 } 1239 } 1240 } 1241 LabelMap.clear(); 1242 1243 return D; 1244} 1245 1246/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1247/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1248ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1249 IdentifierInfo &II, Scope *S) { 1250 if (getLangOptions().C99) // Extension in C99. 1251 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1252 else // Legal in C90, but warn about it. 1253 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1254 1255 // FIXME: handle stuff like: 1256 // void foo() { extern float X(); } 1257 // void bar() { X(); } <-- implicit decl for X in another scope. 1258 1259 // Set a Declarator for the implicit definition: int foo(); 1260 const char *Dummy; 1261 DeclSpec DS; 1262 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1263 Error = Error; // Silence warning. 1264 assert(!Error && "Error setting up implicit decl!"); 1265 Declarator D(DS, Declarator::BlockContext); 1266 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1267 D.SetIdentifier(&II, Loc); 1268 1269 // Find translation-unit scope to insert this function into. 1270 if (Scope *FnS = S->getFnParent()) 1271 S = FnS->getParent(); // Skip all scopes in a function at once. 1272 while (S->getParent()) 1273 S = S->getParent(); 1274 1275 FunctionDecl *FD = 1276 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1277 FD->setImplicit(); 1278 return FD; 1279} 1280 1281 1282TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1283 ScopedDecl *LastDeclarator) { 1284 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1285 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1286 1287 // Scope manipulation handled by caller. 1288 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1289 D.getIdentifierLoc(), 1290 D.getIdentifier(), 1291 T, LastDeclarator); 1292 if (D.getInvalidType()) 1293 NewTD->setInvalidDecl(); 1294 return NewTD; 1295} 1296 1297/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1298/// former case, Name will be non-null. In the later case, Name will be null. 1299/// TagType indicates what kind of tag this is. TK indicates whether this is a 1300/// reference/declaration/definition of a tag. 1301Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1302 SourceLocation KWLoc, IdentifierInfo *Name, 1303 SourceLocation NameLoc, AttributeList *Attr) { 1304 // If this is a use of an existing tag, it must have a name. 1305 assert((Name != 0 || TK == TK_Definition) && 1306 "Nameless record must be a definition!"); 1307 1308 Decl::Kind Kind; 1309 switch (TagType) { 1310 default: assert(0 && "Unknown tag type!"); 1311 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1312 case DeclSpec::TST_union: Kind = Decl::Union; break; 1313 case DeclSpec::TST_class: Kind = Decl::Class; break; 1314 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1315 } 1316 1317 // If this is a named struct, check to see if there was a previous forward 1318 // declaration or definition. 1319 if (TagDecl *PrevDecl = 1320 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1321 1322 // If this is a use of a previous tag, or if the tag is already declared in 1323 // the same scope (so that the definition/declaration completes or 1324 // rementions the tag), reuse the decl. 1325 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1326 // Make sure that this wasn't declared as an enum and now used as a struct 1327 // or something similar. 1328 if (PrevDecl->getKind() != Kind) { 1329 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1330 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1331 } 1332 1333 // If this is a use or a forward declaration, we're good. 1334 if (TK != TK_Definition) 1335 return PrevDecl; 1336 1337 // Diagnose attempts to redefine a tag. 1338 if (PrevDecl->isDefinition()) { 1339 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1340 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1341 // If this is a redefinition, recover by making this struct be 1342 // anonymous, which will make any later references get the previous 1343 // definition. 1344 Name = 0; 1345 } else { 1346 // Okay, this is definition of a previously declared or referenced tag. 1347 // Move the location of the decl to be the definition site. 1348 PrevDecl->setLocation(NameLoc); 1349 return PrevDecl; 1350 } 1351 } 1352 // If we get here, this is a definition of a new struct type in a nested 1353 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1354 // type. 1355 } 1356 1357 // If there is an identifier, use the location of the identifier as the 1358 // location of the decl, otherwise use the location of the struct/union 1359 // keyword. 1360 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1361 1362 // Otherwise, if this is the first time we've seen this tag, create the decl. 1363 TagDecl *New; 1364 switch (Kind) { 1365 default: assert(0 && "Unknown tag kind!"); 1366 case Decl::Enum: 1367 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1368 // enum X { A, B, C } D; D should chain to X. 1369 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1370 // If this is an undefined enum, warn. 1371 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1372 break; 1373 case Decl::Union: 1374 case Decl::Struct: 1375 case Decl::Class: 1376 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1377 // struct X { int A; } D; D should chain to X. 1378 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1379 break; 1380 } 1381 1382 // If this has an identifier, add it to the scope stack. 1383 if (Name) { 1384 // The scope passed in may not be a decl scope. Zip up the scope tree until 1385 // we find one that is. 1386 while ((S->getFlags() & Scope::DeclScope) == 0) 1387 S = S->getParent(); 1388 1389 // Add it to the decl chain. 1390 PushOnScopeChains(New, S); 1391 } 1392 1393 HandleDeclAttributes(New, Attr, 0); 1394 return New; 1395} 1396 1397/// ActOnField - Each field of a struct/union/class is passed into this in order 1398/// to create a FieldDecl object for it. 1399Sema::DeclTy *Sema::ActOnField(Scope *S, 1400 SourceLocation DeclStart, 1401 Declarator &D, ExprTy *BitfieldWidth) { 1402 IdentifierInfo *II = D.getIdentifier(); 1403 Expr *BitWidth = (Expr*)BitfieldWidth; 1404 SourceLocation Loc = DeclStart; 1405 if (II) Loc = D.getIdentifierLoc(); 1406 1407 // FIXME: Unnamed fields can be handled in various different ways, for 1408 // example, unnamed unions inject all members into the struct namespace! 1409 1410 1411 if (BitWidth) { 1412 // TODO: Validate. 1413 //printf("WARNING: BITFIELDS IGNORED!\n"); 1414 1415 // 6.7.2.1p3 1416 // 6.7.2.1p4 1417 1418 } else { 1419 // Not a bitfield. 1420 1421 // validate II. 1422 1423 } 1424 1425 QualType T = GetTypeForDeclarator(D, S); 1426 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1427 bool InvalidDecl = false; 1428 1429 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1430 // than a variably modified type. 1431 if (T->isVariablyModifiedType()) { 1432 // FIXME: This diagnostic needs work 1433 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1434 InvalidDecl = true; 1435 } 1436 // FIXME: Chain fielddecls together. 1437 FieldDecl *NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1438 1439 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1440 D.getAttributes()); 1441 1442 if (D.getInvalidType() || InvalidDecl) 1443 NewFD->setInvalidDecl(); 1444 return NewFD; 1445} 1446 1447/// TranslateIvarVisibility - Translate visibility from a token ID to an 1448/// AST enum value. 1449static ObjCIvarDecl::AccessControl 1450TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1451 switch (ivarVisibility) { 1452 case tok::objc_private: return ObjCIvarDecl::Private; 1453 case tok::objc_public: return ObjCIvarDecl::Public; 1454 case tok::objc_protected: return ObjCIvarDecl::Protected; 1455 case tok::objc_package: return ObjCIvarDecl::Package; 1456 default: assert(false && "Unknown visitibility kind"); 1457 } 1458} 1459 1460/// ActOnIvar - Each ivar field of an objective-c class is passed into this 1461/// in order to create an IvarDecl object for it. 1462Sema::DeclTy *Sema::ActOnIvar(Scope *S, 1463 SourceLocation DeclStart, 1464 Declarator &D, ExprTy *BitfieldWidth, 1465 tok::ObjCKeywordKind Visibility) { 1466 IdentifierInfo *II = D.getIdentifier(); 1467 Expr *BitWidth = (Expr*)BitfieldWidth; 1468 SourceLocation Loc = DeclStart; 1469 if (II) Loc = D.getIdentifierLoc(); 1470 1471 // FIXME: Unnamed fields can be handled in various different ways, for 1472 // example, unnamed unions inject all members into the struct namespace! 1473 1474 1475 if (BitWidth) { 1476 // TODO: Validate. 1477 //printf("WARNING: BITFIELDS IGNORED!\n"); 1478 1479 // 6.7.2.1p3 1480 // 6.7.2.1p4 1481 1482 } else { 1483 // Not a bitfield. 1484 1485 // validate II. 1486 1487 } 1488 1489 QualType T = GetTypeForDeclarator(D, S); 1490 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1491 bool InvalidDecl = false; 1492 1493 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1494 // than a variably modified type. 1495 if (T->isVariablyModifiedType()) { 1496 // FIXME: This diagnostic needs work 1497 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1498 InvalidDecl = true; 1499 } 1500 1501 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T); 1502 1503 HandleDeclAttributes(NewID, D.getDeclSpec().getAttributes(), 1504 D.getAttributes()); 1505 1506 if (D.getInvalidType() || InvalidDecl) 1507 NewID->setInvalidDecl(); 1508 // If we have visibility info, make sure the AST is set accordingly. 1509 if (Visibility != tok::objc_not_keyword) 1510 NewID->setAccessControl(TranslateIvarVisibility(Visibility)); 1511 return NewID; 1512} 1513 1514void Sema::ActOnFields(Scope* S, 1515 SourceLocation RecLoc, DeclTy *RecDecl, 1516 DeclTy **Fields, unsigned NumFields, 1517 SourceLocation LBrac, SourceLocation RBrac) { 1518 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1519 assert(EnclosingDecl && "missing record or interface decl"); 1520 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1521 1522 if (Record && Record->isDefinition()) { 1523 // Diagnose code like: 1524 // struct S { struct S {} X; }; 1525 // We discover this when we complete the outer S. Reject and ignore the 1526 // outer S. 1527 Diag(Record->getLocation(), diag::err_nested_redefinition, 1528 Record->getKindName()); 1529 Diag(RecLoc, diag::err_previous_definition); 1530 Record->setInvalidDecl(); 1531 return; 1532 } 1533 // Verify that all the fields are okay. 1534 unsigned NumNamedMembers = 0; 1535 llvm::SmallVector<FieldDecl*, 32> RecFields; 1536 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1537 1538 for (unsigned i = 0; i != NumFields; ++i) { 1539 1540 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1541 assert(FD && "missing field decl"); 1542 1543 // Remember all fields. 1544 RecFields.push_back(FD); 1545 1546 // Get the type for the field. 1547 Type *FDTy = FD->getType().getTypePtr(); 1548 1549 // C99 6.7.2.1p2 - A field may not be a function type. 1550 if (FDTy->isFunctionType()) { 1551 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1552 FD->getName()); 1553 FD->setInvalidDecl(); 1554 EnclosingDecl->setInvalidDecl(); 1555 continue; 1556 } 1557 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1558 if (FDTy->isIncompleteType()) { 1559 if (!Record) { // Incomplete ivar type is always an error. 1560 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1561 FD->setInvalidDecl(); 1562 EnclosingDecl->setInvalidDecl(); 1563 continue; 1564 } 1565 if (i != NumFields-1 || // ... that the last member ... 1566 Record->getKind() != Decl::Struct || // ... of a structure ... 1567 !FDTy->isArrayType()) { //... may have incomplete array type. 1568 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1569 FD->setInvalidDecl(); 1570 EnclosingDecl->setInvalidDecl(); 1571 continue; 1572 } 1573 if (NumNamedMembers < 1) { //... must have more than named member ... 1574 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1575 FD->getName()); 1576 FD->setInvalidDecl(); 1577 EnclosingDecl->setInvalidDecl(); 1578 continue; 1579 } 1580 // Okay, we have a legal flexible array member at the end of the struct. 1581 if (Record) 1582 Record->setHasFlexibleArrayMember(true); 1583 } 1584 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1585 /// field of another structure or the element of an array. 1586 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1587 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1588 // If this is a member of a union, then entire union becomes "flexible". 1589 if (Record && Record->getKind() == Decl::Union) { 1590 Record->setHasFlexibleArrayMember(true); 1591 } else { 1592 // If this is a struct/class and this is not the last element, reject 1593 // it. Note that GCC supports variable sized arrays in the middle of 1594 // structures. 1595 if (i != NumFields-1) { 1596 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1597 FD->getName()); 1598 FD->setInvalidDecl(); 1599 EnclosingDecl->setInvalidDecl(); 1600 continue; 1601 } 1602 // We support flexible arrays at the end of structs in other structs 1603 // as an extension. 1604 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1605 FD->getName()); 1606 if (Record) 1607 Record->setHasFlexibleArrayMember(true); 1608 } 1609 } 1610 } 1611 /// A field cannot be an Objective-c object 1612 if (FDTy->isObjCInterfaceType()) { 1613 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1614 FD->getName()); 1615 FD->setInvalidDecl(); 1616 EnclosingDecl->setInvalidDecl(); 1617 continue; 1618 } 1619 // Keep track of the number of named members. 1620 if (IdentifierInfo *II = FD->getIdentifier()) { 1621 // Detect duplicate member names. 1622 if (!FieldIDs.insert(II)) { 1623 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1624 // Find the previous decl. 1625 SourceLocation PrevLoc; 1626 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1627 assert(i != e && "Didn't find previous def!"); 1628 if (RecFields[i]->getIdentifier() == II) { 1629 PrevLoc = RecFields[i]->getLocation(); 1630 break; 1631 } 1632 } 1633 Diag(PrevLoc, diag::err_previous_definition); 1634 FD->setInvalidDecl(); 1635 EnclosingDecl->setInvalidDecl(); 1636 continue; 1637 } 1638 ++NumNamedMembers; 1639 } 1640 } 1641 1642 // Okay, we successfully defined 'Record'. 1643 if (Record) { 1644 Record->defineBody(&RecFields[0], RecFields.size()); 1645 Consumer.HandleTagDeclDefinition(Record); 1646 } else { 1647 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1648 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1649 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1650 else if (ObjCImplementationDecl *IMPDecl = 1651 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1652 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1653 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1654 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1655 } 1656 } 1657} 1658 1659Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1660 DeclTy *lastEnumConst, 1661 SourceLocation IdLoc, IdentifierInfo *Id, 1662 SourceLocation EqualLoc, ExprTy *val) { 1663 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1664 EnumConstantDecl *LastEnumConst = 1665 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1666 Expr *Val = static_cast<Expr*>(val); 1667 1668 // The scope passed in may not be a decl scope. Zip up the scope tree until 1669 // we find one that is. 1670 while ((S->getFlags() & Scope::DeclScope) == 0) 1671 S = S->getParent(); 1672 1673 // Verify that there isn't already something declared with this name in this 1674 // scope. 1675 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1676 if (S->isDeclScope(PrevDecl)) { 1677 if (isa<EnumConstantDecl>(PrevDecl)) 1678 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1679 else 1680 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1681 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1682 delete Val; 1683 return 0; 1684 } 1685 } 1686 1687 llvm::APSInt EnumVal(32); 1688 QualType EltTy; 1689 if (Val) { 1690 // Make sure to promote the operand type to int. 1691 UsualUnaryConversions(Val); 1692 1693 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1694 SourceLocation ExpLoc; 1695 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1696 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1697 Id->getName()); 1698 delete Val; 1699 Val = 0; // Just forget about it. 1700 } else { 1701 EltTy = Val->getType(); 1702 } 1703 } 1704 1705 if (!Val) { 1706 if (LastEnumConst) { 1707 // Assign the last value + 1. 1708 EnumVal = LastEnumConst->getInitVal(); 1709 ++EnumVal; 1710 1711 // Check for overflow on increment. 1712 if (EnumVal < LastEnumConst->getInitVal()) 1713 Diag(IdLoc, diag::warn_enum_value_overflow); 1714 1715 EltTy = LastEnumConst->getType(); 1716 } else { 1717 // First value, set to zero. 1718 EltTy = Context.IntTy; 1719 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1720 } 1721 } 1722 1723 EnumConstantDecl *New = 1724 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1725 Val, EnumVal, 1726 LastEnumConst); 1727 1728 // Register this decl in the current scope stack. 1729 PushOnScopeChains(New, S); 1730 return New; 1731} 1732 1733void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1734 DeclTy **Elements, unsigned NumElements) { 1735 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1736 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1737 1738 // TODO: If the result value doesn't fit in an int, it must be a long or long 1739 // long value. ISO C does not support this, but GCC does as an extension, 1740 // emit a warning. 1741 unsigned IntWidth = Context.Target.getIntWidth(); 1742 1743 // Verify that all the values are okay, compute the size of the values, and 1744 // reverse the list. 1745 unsigned NumNegativeBits = 0; 1746 unsigned NumPositiveBits = 0; 1747 1748 // Keep track of whether all elements have type int. 1749 bool AllElementsInt = true; 1750 1751 EnumConstantDecl *EltList = 0; 1752 for (unsigned i = 0; i != NumElements; ++i) { 1753 EnumConstantDecl *ECD = 1754 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1755 if (!ECD) continue; // Already issued a diagnostic. 1756 1757 // If the enum value doesn't fit in an int, emit an extension warning. 1758 const llvm::APSInt &InitVal = ECD->getInitVal(); 1759 assert(InitVal.getBitWidth() >= IntWidth && 1760 "Should have promoted value to int"); 1761 if (InitVal.getBitWidth() > IntWidth) { 1762 llvm::APSInt V(InitVal); 1763 V.trunc(IntWidth); 1764 V.extend(InitVal.getBitWidth()); 1765 if (V != InitVal) 1766 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1767 InitVal.toString()); 1768 } 1769 1770 // Keep track of the size of positive and negative values. 1771 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1772 NumPositiveBits = std::max(NumPositiveBits, 1773 (unsigned)InitVal.getActiveBits()); 1774 else 1775 NumNegativeBits = std::max(NumNegativeBits, 1776 (unsigned)InitVal.getMinSignedBits()); 1777 1778 // Keep track of whether every enum element has type int (very commmon). 1779 if (AllElementsInt) 1780 AllElementsInt = ECD->getType() == Context.IntTy; 1781 1782 ECD->setNextDeclarator(EltList); 1783 EltList = ECD; 1784 } 1785 1786 // Figure out the type that should be used for this enum. 1787 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1788 QualType BestType; 1789 unsigned BestWidth; 1790 1791 if (NumNegativeBits) { 1792 // If there is a negative value, figure out the smallest integer type (of 1793 // int/long/longlong) that fits. 1794 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1795 BestType = Context.IntTy; 1796 BestWidth = IntWidth; 1797 } else { 1798 BestWidth = Context.Target.getLongWidth(); 1799 1800 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1801 BestType = Context.LongTy; 1802 else { 1803 BestWidth = Context.Target.getLongLongWidth(); 1804 1805 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1806 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1807 BestType = Context.LongLongTy; 1808 } 1809 } 1810 } else { 1811 // If there is no negative value, figure out which of uint, ulong, ulonglong 1812 // fits. 1813 if (NumPositiveBits <= IntWidth) { 1814 BestType = Context.UnsignedIntTy; 1815 BestWidth = IntWidth; 1816 } else if (NumPositiveBits <= 1817 (BestWidth = Context.Target.getLongWidth())) { 1818 BestType = Context.UnsignedLongTy; 1819 } else { 1820 BestWidth = Context.Target.getLongLongWidth(); 1821 assert(NumPositiveBits <= BestWidth && 1822 "How could an initializer get larger than ULL?"); 1823 BestType = Context.UnsignedLongLongTy; 1824 } 1825 } 1826 1827 // Loop over all of the enumerator constants, changing their types to match 1828 // the type of the enum if needed. 1829 for (unsigned i = 0; i != NumElements; ++i) { 1830 EnumConstantDecl *ECD = 1831 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1832 if (!ECD) continue; // Already issued a diagnostic. 1833 1834 // Standard C says the enumerators have int type, but we allow, as an 1835 // extension, the enumerators to be larger than int size. If each 1836 // enumerator value fits in an int, type it as an int, otherwise type it the 1837 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1838 // that X has type 'int', not 'unsigned'. 1839 if (ECD->getType() == Context.IntTy) { 1840 // Make sure the init value is signed. 1841 llvm::APSInt IV = ECD->getInitVal(); 1842 IV.setIsSigned(true); 1843 ECD->setInitVal(IV); 1844 continue; // Already int type. 1845 } 1846 1847 // Determine whether the value fits into an int. 1848 llvm::APSInt InitVal = ECD->getInitVal(); 1849 bool FitsInInt; 1850 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1851 FitsInInt = InitVal.getActiveBits() < IntWidth; 1852 else 1853 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1854 1855 // If it fits into an integer type, force it. Otherwise force it to match 1856 // the enum decl type. 1857 QualType NewTy; 1858 unsigned NewWidth; 1859 bool NewSign; 1860 if (FitsInInt) { 1861 NewTy = Context.IntTy; 1862 NewWidth = IntWidth; 1863 NewSign = true; 1864 } else if (ECD->getType() == BestType) { 1865 // Already the right type! 1866 continue; 1867 } else { 1868 NewTy = BestType; 1869 NewWidth = BestWidth; 1870 NewSign = BestType->isSignedIntegerType(); 1871 } 1872 1873 // Adjust the APSInt value. 1874 InitVal.extOrTrunc(NewWidth); 1875 InitVal.setIsSigned(NewSign); 1876 ECD->setInitVal(InitVal); 1877 1878 // Adjust the Expr initializer and type. 1879 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1880 ECD->setType(NewTy); 1881 } 1882 1883 Enum->defineElements(EltList, BestType); 1884 Consumer.HandleTagDeclDefinition(Enum); 1885} 1886 1887Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1888 ExprTy *expr) { 1889 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1890 1891 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1892} 1893 1894Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1895 SourceLocation LBrace, 1896 SourceLocation RBrace, 1897 const char *Lang, 1898 unsigned StrSize, 1899 DeclTy *D) { 1900 LinkageSpecDecl::LanguageIDs Language; 1901 Decl *dcl = static_cast<Decl *>(D); 1902 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1903 Language = LinkageSpecDecl::lang_c; 1904 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1905 Language = LinkageSpecDecl::lang_cxx; 1906 else { 1907 Diag(Loc, diag::err_bad_language); 1908 return 0; 1909 } 1910 1911 // FIXME: Add all the various semantics of linkage specifications 1912 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1913} 1914 1915void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1916 1917 switch (Attr->getKind()) { 1918 case AttributeList::AT_vector_size: 1919 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1920 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1921 if (!newType.isNull()) // install the new vector type into the decl 1922 vDecl->setType(newType); 1923 } 1924 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1925 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1926 Attr); 1927 if (!newType.isNull()) // install the new vector type into the decl 1928 tDecl->setUnderlyingType(newType); 1929 } 1930 break; 1931 case AttributeList::AT_ocu_vector_type: 1932 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1933 HandleOCUVectorTypeAttribute(tDecl, Attr); 1934 else 1935 Diag(Attr->getLoc(), 1936 diag::err_typecheck_ocu_vector_not_typedef); 1937 break; 1938 case AttributeList::AT_address_space: 1939 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1940 QualType newType = HandleAddressSpaceTypeAttribute( 1941 tDecl->getUnderlyingType(), 1942 Attr); 1943 tDecl->setUnderlyingType(newType); 1944 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1945 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1946 Attr); 1947 // install the new addr spaced type into the decl 1948 vDecl->setType(newType); 1949 } 1950 break; 1951 case AttributeList::AT_deprecated: 1952 HandleDeprecatedAttribute(New, Attr); 1953 break; 1954 case AttributeList::AT_visibility: 1955 HandleVisibilityAttribute(New, Attr); 1956 break; 1957 case AttributeList::AT_weak: 1958 HandleWeakAttribute(New, Attr); 1959 break; 1960 case AttributeList::AT_dllimport: 1961 HandleDLLImportAttribute(New, Attr); 1962 break; 1963 case AttributeList::AT_dllexport: 1964 HandleDLLExportAttribute(New, Attr); 1965 break; 1966 case AttributeList::AT_nothrow: 1967 HandleNothrowAttribute(New, Attr); 1968 break; 1969 case AttributeList::AT_stdcall: 1970 HandleStdCallAttribute(New, Attr); 1971 break; 1972 case AttributeList::AT_fastcall: 1973 HandleFastCallAttribute(New, Attr); 1974 break; 1975 case AttributeList::AT_aligned: 1976 HandleAlignedAttribute(New, Attr); 1977 break; 1978 case AttributeList::AT_packed: 1979 HandlePackedAttribute(New, Attr); 1980 break; 1981 case AttributeList::AT_annotate: 1982 HandleAnnotateAttribute(New, Attr); 1983 break; 1984 case AttributeList::AT_noreturn: 1985 HandleNoReturnAttribute(New, Attr); 1986 break; 1987 case AttributeList::AT_format: 1988 HandleFormatAttribute(New, Attr); 1989 break; 1990 default: 1991#if 0 1992 // TODO: when we have the full set of attributes, warn about unknown ones. 1993 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1994 Attr->getName()->getName()); 1995#endif 1996 break; 1997 } 1998} 1999 2000void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 2001 AttributeList *declarator_postfix) { 2002 while (declspec_prefix) { 2003 HandleDeclAttribute(New, declspec_prefix); 2004 declspec_prefix = declspec_prefix->getNext(); 2005 } 2006 while (declarator_postfix) { 2007 HandleDeclAttribute(New, declarator_postfix); 2008 declarator_postfix = declarator_postfix->getNext(); 2009 } 2010} 2011 2012void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 2013 AttributeList *rawAttr) { 2014 QualType curType = tDecl->getUnderlyingType(); 2015 // check the attribute arguments. 2016 if (rawAttr->getNumArgs() != 1) { 2017 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2018 std::string("1")); 2019 return; 2020 } 2021 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2022 llvm::APSInt vecSize(32); 2023 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2024 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2025 "ocu_vector_type", sizeExpr->getSourceRange()); 2026 return; 2027 } 2028 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 2029 // in conjunction with complex types (pointers, arrays, functions, etc.). 2030 Type *canonType = curType.getCanonicalType().getTypePtr(); 2031 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2032 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2033 curType.getCanonicalType().getAsString()); 2034 return; 2035 } 2036 // unlike gcc's vector_size attribute, the size is specified as the 2037 // number of elements, not the number of bytes. 2038 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 2039 2040 if (vectorSize == 0) { 2041 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2042 sizeExpr->getSourceRange()); 2043 return; 2044 } 2045 // Instantiate/Install the vector type, the number of elements is > 0. 2046 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 2047 // Remember this typedef decl, we will need it later for diagnostics. 2048 OCUVectorDecls.push_back(tDecl); 2049} 2050 2051QualType Sema::HandleVectorTypeAttribute(QualType curType, 2052 AttributeList *rawAttr) { 2053 // check the attribute arugments. 2054 if (rawAttr->getNumArgs() != 1) { 2055 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2056 std::string("1")); 2057 return QualType(); 2058 } 2059 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2060 llvm::APSInt vecSize(32); 2061 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2062 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2063 "vector_size", sizeExpr->getSourceRange()); 2064 return QualType(); 2065 } 2066 // navigate to the base type - we need to provide for vector pointers, 2067 // vector arrays, and functions returning vectors. 2068 Type *canonType = curType.getCanonicalType().getTypePtr(); 2069 2070 if (canonType->isPointerType() || canonType->isArrayType() || 2071 canonType->isFunctionType()) { 2072 assert(0 && "HandleVector(): Complex type construction unimplemented"); 2073 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 2074 do { 2075 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 2076 canonType = PT->getPointeeType().getTypePtr(); 2077 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 2078 canonType = AT->getElementType().getTypePtr(); 2079 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 2080 canonType = FT->getResultType().getTypePtr(); 2081 } while (canonType->isPointerType() || canonType->isArrayType() || 2082 canonType->isFunctionType()); 2083 */ 2084 } 2085 // the base type must be integer or float. 2086 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2087 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2088 curType.getCanonicalType().getAsString()); 2089 return QualType(); 2090 } 2091 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 2092 // vecSize is specified in bytes - convert to bits. 2093 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 2094 2095 // the vector size needs to be an integral multiple of the type size. 2096 if (vectorSize % typeSize) { 2097 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 2098 sizeExpr->getSourceRange()); 2099 return QualType(); 2100 } 2101 if (vectorSize == 0) { 2102 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2103 sizeExpr->getSourceRange()); 2104 return QualType(); 2105 } 2106 // Instantiate the vector type, the number of elements is > 0, and not 2107 // required to be a power of 2, unlike GCC. 2108 return Context.getVectorType(curType, vectorSize/typeSize); 2109} 2110 2111void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 2112 // check the attribute arguments. 2113 if (rawAttr->getNumArgs() > 0) { 2114 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2115 std::string("0")); 2116 return; 2117 } 2118 2119 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 2120 TD->addAttr(new PackedAttr); 2121 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 2122 // If the alignment is less than or equal to 8 bits, the packed attribute 2123 // has no effect. 2124 if (Context.getTypeAlign(FD->getType()) <= 8) 2125 Diag(rawAttr->getLoc(), 2126 diag::warn_attribute_ignored_for_field_of_type, 2127 rawAttr->getName()->getName(), FD->getType().getAsString()); 2128 else 2129 FD->addAttr(new PackedAttr); 2130 } else 2131 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2132 rawAttr->getName()->getName()); 2133} 2134 2135void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2136 // check the attribute arguments. 2137 if (rawAttr->getNumArgs() != 0) { 2138 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2139 std::string("0")); 2140 return; 2141 } 2142 2143 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2144 2145 if (!Fn) { 2146 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2147 "noreturn", "function"); 2148 return; 2149 } 2150 2151 d->addAttr(new NoReturnAttr()); 2152} 2153 2154void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2155 // check the attribute arguments. 2156 if (rawAttr->getNumArgs() != 0) { 2157 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2158 std::string("0")); 2159 return; 2160 } 2161 2162 d->addAttr(new DeprecatedAttr()); 2163} 2164 2165void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2166 // check the attribute arguments. 2167 if (rawAttr->getNumArgs() != 1) { 2168 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2169 std::string("1")); 2170 return; 2171 } 2172 2173 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2174 Arg = Arg->IgnoreParenCasts(); 2175 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2176 2177 if (Str == 0 || Str->isWide()) { 2178 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2179 "visibility", std::string("1")); 2180 return; 2181 } 2182 2183 const char *TypeStr = Str->getStrData(); 2184 unsigned TypeLen = Str->getByteLength(); 2185 llvm::GlobalValue::VisibilityTypes type; 2186 2187 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2188 type = llvm::GlobalValue::DefaultVisibility; 2189 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2190 type = llvm::GlobalValue::HiddenVisibility; 2191 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2192 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2193 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2194 type = llvm::GlobalValue::ProtectedVisibility; 2195 else { 2196 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2197 "visibility", TypeStr); 2198 return; 2199 } 2200 2201 d->addAttr(new VisibilityAttr(type)); 2202} 2203 2204void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2205 // check the attribute arguments. 2206 if (rawAttr->getNumArgs() != 0) { 2207 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2208 std::string("0")); 2209 return; 2210 } 2211 2212 d->addAttr(new WeakAttr()); 2213} 2214 2215void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2216 // check the attribute arguments. 2217 if (rawAttr->getNumArgs() != 0) { 2218 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2219 std::string("0")); 2220 return; 2221 } 2222 2223 d->addAttr(new DLLImportAttr()); 2224} 2225 2226void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2227 // check the attribute arguments. 2228 if (rawAttr->getNumArgs() != 0) { 2229 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2230 std::string("0")); 2231 return; 2232 } 2233 2234 d->addAttr(new DLLExportAttr()); 2235} 2236 2237void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2238 // check the attribute arguments. 2239 if (rawAttr->getNumArgs() != 0) { 2240 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2241 std::string("0")); 2242 return; 2243 } 2244 2245 d->addAttr(new StdCallAttr()); 2246} 2247 2248void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2249 // check the attribute arguments. 2250 if (rawAttr->getNumArgs() != 0) { 2251 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2252 std::string("0")); 2253 return; 2254 } 2255 2256 d->addAttr(new FastCallAttr()); 2257} 2258 2259void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2260 // check the attribute arguments. 2261 if (rawAttr->getNumArgs() != 0) { 2262 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2263 std::string("0")); 2264 return; 2265 } 2266 2267 d->addAttr(new NoThrowAttr()); 2268} 2269 2270static const FunctionTypeProto *getFunctionProto(Decl *d) { 2271 ValueDecl *decl = dyn_cast<ValueDecl>(d); 2272 if (!decl) return 0; 2273 2274 QualType Ty = decl->getType(); 2275 2276 if (Ty->isFunctionPointerType()) { 2277 const PointerType *PtrTy = Ty->getAsPointerType(); 2278 Ty = PtrTy->getPointeeType(); 2279 } 2280 2281 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2282 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2283 2284 return 0; 2285} 2286 2287 2288/// Handle __attribute__((format(type,idx,firstarg))) attributes 2289/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2290void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2291 2292 if (!rawAttr->getParameterName()) { 2293 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2294 "format", std::string("1")); 2295 return; 2296 } 2297 2298 if (rawAttr->getNumArgs() != 2) { 2299 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2300 std::string("3")); 2301 return; 2302 } 2303 2304 // GCC ignores the format attribute on K&R style function 2305 // prototypes, so we ignore it as well 2306 const FunctionTypeProto *proto = getFunctionProto(d); 2307 2308 if (!proto) { 2309 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2310 "format", "function"); 2311 return; 2312 } 2313 2314 // FIXME: in C++ the implicit 'this' function parameter also counts. 2315 // this is needed in order to be compatible with GCC 2316 // the index must start in 1 and the limit is numargs+1 2317 unsigned NumArgs = proto->getNumArgs(); 2318 unsigned FirstIdx = 1; 2319 2320 const char *Format = rawAttr->getParameterName()->getName(); 2321 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2322 2323 // Normalize the argument, __foo__ becomes foo. 2324 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2325 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2326 Format += 2; 2327 FormatLen -= 4; 2328 } 2329 2330 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2331 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2332 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2333 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2334 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2335 "format", rawAttr->getParameterName()->getName()); 2336 return; 2337 } 2338 2339 // checks for the 2nd argument 2340 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2341 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2342 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2343 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2344 "format", std::string("2"), IdxExpr->getSourceRange()); 2345 return; 2346 } 2347 2348 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2349 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2350 "format", std::string("2"), IdxExpr->getSourceRange()); 2351 return; 2352 } 2353 2354 // make sure the format string is really a string 2355 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2356 if (!Ty->isPointerType() || 2357 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2358 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2359 IdxExpr->getSourceRange()); 2360 return; 2361 } 2362 2363 2364 // check the 3rd argument 2365 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2366 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2367 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2368 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2369 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2370 return; 2371 } 2372 2373 // check if the function is variadic if the 3rd argument non-zero 2374 if (FirstArg != 0) { 2375 if (proto->isVariadic()) { 2376 ++NumArgs; // +1 for ... 2377 } else { 2378 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2379 return; 2380 } 2381 } 2382 2383 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2384 // the input is just the current time + the format string 2385 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2386 if (FirstArg != 0) { 2387 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2388 FirstArgExpr->getSourceRange()); 2389 return; 2390 } 2391 // if 0 it disables parameter checking (to use with e.g. va_list) 2392 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2393 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2394 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2395 return; 2396 } 2397 2398 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2399 Idx.getZExtValue(), FirstArg.getZExtValue())); 2400} 2401 2402void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2403 // check the attribute arguments. 2404 if (rawAttr->getNumArgs() != 1) { 2405 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2406 std::string("1")); 2407 return; 2408 } 2409 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2410 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2411 2412 // Make sure that there is a string literal as the annotation's single 2413 // argument. 2414 if (!SE) { 2415 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2416 return; 2417 } 2418 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2419 SE->getByteLength()))); 2420} 2421 2422void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2423{ 2424 // check the attribute arguments. 2425 if (rawAttr->getNumArgs() > 1) { 2426 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2427 std::string("1")); 2428 return; 2429 } 2430 2431 unsigned Align = 0; 2432 2433 if (rawAttr->getNumArgs() == 0) { 2434 // FIXME: This should be the target specific maximum alignment. 2435 // (For now we just use 128 bits which is the maximum on X86. 2436 Align = 128; 2437 return; 2438 } else { 2439 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2440 llvm::APSInt alignment(32); 2441 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2442 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2443 "aligned", alignmentExpr->getSourceRange()); 2444 return; 2445 } 2446 2447 Align = alignment.getZExtValue() * 8; 2448 } 2449 2450 d->addAttr(new AlignedAttr(Align)); 2451} 2452