SemaDecl.cpp revision f009795057dc8ca254f5618c80a0a90f07cd44b4
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/// Redeclaration will be set true if thisNew is a redeclaration OldD. 260FunctionDecl * 261Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, bool &Redeclaration) { 262 Redeclaration = false; 263 // Verify the old decl was also a function. 264 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 265 if (!Old) { 266 Diag(New->getLocation(), diag::err_redefinition_different_kind, 267 New->getName()); 268 Diag(OldD->getLocation(), diag::err_previous_definition); 269 return New; 270 } 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 MergeAttributes(New, Old); 280 Redeclaration = true; 281 return MergeCXXFunctionDecl(New, Old); 282 } 283 284 // C: Function types need to be compatible, not identical. This handles 285 // duplicate function decls like "void f(int); void f(enum X);" properly. 286 if (!getLangOptions().CPlusPlus && 287 Context.functionTypesAreCompatible(OldQType, NewQType)) { 288 MergeAttributes(New, Old); 289 Redeclaration = true; 290 return New; 291 } 292 293 // A function that has already been declared has been redeclared or defined 294 // with a different type- show appropriate diagnostic 295 diag::kind PrevDiag; 296 if (Old->isThisDeclarationADefinition()) 297 PrevDiag = diag::err_previous_definition; 298 else if (Old->isImplicit()) 299 PrevDiag = diag::err_previous_implicit_declaration; 300 else 301 PrevDiag = diag::err_previous_declaration; 302 303 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 304 // TODO: This is totally simplistic. It should handle merging functions 305 // together etc, merging extern int X; int X; ... 306 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 307 Diag(Old->getLocation(), PrevDiag); 308 return New; 309} 310 311/// equivalentArrayTypes - Used to determine whether two array types are 312/// equivalent. 313/// We need to check this explicitly as an incomplete array definition is 314/// considered a VariableArrayType, so will not match a complete array 315/// definition that would be otherwise equivalent. 316static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 317 const ArrayType *NewAT = NewQType->getAsArrayType(); 318 const ArrayType *OldAT = OldQType->getAsArrayType(); 319 320 if (!NewAT || !OldAT) 321 return false; 322 323 // If either (or both) array types in incomplete we need to strip off the 324 // outer VariableArrayType. Once the outer VAT is removed the remaining 325 // types must be identical if the array types are to be considered 326 // equivalent. 327 // eg. int[][1] and int[1][1] become 328 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 329 // removing the outermost VAT gives 330 // CAT(1, int) and CAT(1, int) 331 // which are equal, therefore the array types are equivalent. 332 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 333 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 334 return false; 335 NewQType = NewAT->getElementType().getCanonicalType(); 336 OldQType = OldAT->getElementType().getCanonicalType(); 337 } 338 339 return NewQType == OldQType; 340} 341 342/// MergeVarDecl - We just parsed a variable 'New' which has the same name 343/// and scope as a previous declaration 'Old'. Figure out how to resolve this 344/// situation, merging decls or emitting diagnostics as appropriate. 345/// 346/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 347/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 348/// 349VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 350 // Verify the old decl was also a variable. 351 VarDecl *Old = dyn_cast<VarDecl>(OldD); 352 if (!Old) { 353 Diag(New->getLocation(), diag::err_redefinition_different_kind, 354 New->getName()); 355 Diag(OldD->getLocation(), diag::err_previous_definition); 356 return New; 357 } 358 359 MergeAttributes(New, Old); 360 361 // Verify the types match. 362 QualType OldCType = Context.getCanonicalType(Old->getType()); 363 QualType NewCType = Context.getCanonicalType(New->getType()); 364 if (OldCType != NewCType && !areEquivalentArrayTypes(NewCType, OldCType)) { 365 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 366 Diag(Old->getLocation(), diag::err_previous_definition); 367 return New; 368 } 369 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 370 if (New->getStorageClass() == VarDecl::Static && 371 (Old->getStorageClass() == VarDecl::None || 372 Old->getStorageClass() == VarDecl::Extern)) { 373 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 374 Diag(Old->getLocation(), diag::err_previous_definition); 375 return New; 376 } 377 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 378 if (New->getStorageClass() != VarDecl::Static && 379 Old->getStorageClass() == VarDecl::Static) { 380 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 381 Diag(Old->getLocation(), diag::err_previous_definition); 382 return New; 383 } 384 // We've verified the types match, now handle "tentative" definitions. 385 if (Old->isFileVarDecl() && New->isFileVarDecl()) { 386 // Handle C "tentative" external object definitions (C99 6.9.2). 387 bool OldIsTentative = false; 388 bool NewIsTentative = false; 389 390 if (!Old->getInit() && 391 (Old->getStorageClass() == VarDecl::None || 392 Old->getStorageClass() == VarDecl::Static)) 393 OldIsTentative = true; 394 395 // FIXME: this check doesn't work (since the initializer hasn't been 396 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 397 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 398 // thrown out the old decl. 399 if (!New->getInit() && 400 (New->getStorageClass() == VarDecl::None || 401 New->getStorageClass() == VarDecl::Static)) 402 ; // change to NewIsTentative = true; once the code is moved. 403 404 if (NewIsTentative || OldIsTentative) 405 return New; 406 } 407 if (Old->getStorageClass() != VarDecl::Extern && 408 New->getStorageClass() != VarDecl::Extern) { 409 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 410 Diag(Old->getLocation(), diag::err_previous_definition); 411 } 412 return New; 413} 414 415/// CheckParmsForFunctionDef - Check that the parameters of the given 416/// function are appropriate for the definition of a function. This 417/// takes care of any checks that cannot be performed on the 418/// declaration itself, e.g., that the types of each of the function 419/// parameters are complete. 420bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 421 bool HasInvalidParm = false; 422 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 423 ParmVarDecl *Param = FD->getParamDecl(p); 424 425 // C99 6.7.5.3p4: the parameters in a parameter type list in a 426 // function declarator that is part of a function definition of 427 // that function shall not have incomplete type. 428 if (Param->getType()->isIncompleteType() && 429 !Param->isInvalidDecl()) { 430 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type, 431 Param->getType().getAsString()); 432 Param->setInvalidDecl(); 433 HasInvalidParm = true; 434 } 435 } 436 437 return HasInvalidParm; 438} 439 440/// CreateImplicitParameter - Creates an implicit function parameter 441/// in the scope S and with the given type. This routine is used, for 442/// example, to create the implicit "self" parameter in an Objective-C 443/// method. 444ParmVarDecl * 445Sema::CreateImplicitParameter(Scope *S, IdentifierInfo *Id, 446 SourceLocation IdLoc, QualType Type) { 447 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, IdLoc, Id, Type, 448 VarDecl::None, 0, 0); 449 if (Id) 450 PushOnScopeChains(New, S); 451 452 return New; 453} 454 455/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 456/// no declarator (e.g. "struct foo;") is parsed. 457Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 458 // TODO: emit error on 'int;' or 'const enum foo;'. 459 // TODO: emit error on 'typedef int;' 460 // if (!DS.isMissingDeclaratorOk()) Diag(...); 461 462 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 463} 464 465bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 466 // Get the type before calling CheckSingleAssignmentConstraints(), since 467 // it can promote the expression. 468 QualType InitType = Init->getType(); 469 470 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 471 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 472 InitType, Init, "initializing"); 473} 474 475bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 476 QualType ElementType) { 477 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 478 if (CheckSingleInitializer(expr, ElementType)) 479 return true; // types weren't compatible. 480 481 if (savExpr != expr) // The type was promoted, update initializer list. 482 IList->setInit(slot, expr); 483 return false; 484} 485 486bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 487 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 488 // C99 6.7.8p14. We have an array of character type with unknown size 489 // being initialized to a string literal. 490 llvm::APSInt ConstVal(32); 491 ConstVal = strLiteral->getByteLength() + 1; 492 // Return a new array type (C99 6.7.8p22). 493 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 494 ArrayType::Normal, 0); 495 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 496 // C99 6.7.8p14. We have an array of character type with known size. 497 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 498 Diag(strLiteral->getSourceRange().getBegin(), 499 diag::warn_initializer_string_for_char_array_too_long, 500 strLiteral->getSourceRange()); 501 } else { 502 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 503 } 504 // Set type from "char *" to "constant array of char". 505 strLiteral->setType(DeclT); 506 // For now, we always return false (meaning success). 507 return false; 508} 509 510StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 511 const ArrayType *AT = DeclType->getAsArrayType(); 512 if (AT && AT->getElementType()->isCharType()) { 513 return dyn_cast<StringLiteral>(Init); 514 } 515 return 0; 516} 517 518// CheckInitializerListTypes - Checks the types of elements of an initializer 519// list. This function is recursive: it calls itself to initialize subelements 520// of aggregate types. Note that the topLevel parameter essentially refers to 521// whether this expression "owns" the initializer list passed in, or if this 522// initialization is taking elements out of a parent initializer. Each 523// call to this function adds zero or more to startIndex, reports any errors, 524// and returns true if it found any inconsistent types. 525bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 526 bool topLevel, unsigned& startIndex) { 527 bool hadError = false; 528 529 if (DeclType->isScalarType()) { 530 // The simplest case: initializing a single scalar 531 if (topLevel) { 532 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 533 IList->getSourceRange()); 534 } 535 if (startIndex < IList->getNumInits()) { 536 Expr* expr = IList->getInit(startIndex); 537 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 538 // FIXME: Should an error be reported here instead? 539 unsigned newIndex = 0; 540 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 541 } else { 542 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 543 } 544 ++startIndex; 545 } 546 // FIXME: Should an error be reported for empty initializer list + scalar? 547 } else if (DeclType->isVectorType()) { 548 if (startIndex < IList->getNumInits()) { 549 const VectorType *VT = DeclType->getAsVectorType(); 550 int maxElements = VT->getNumElements(); 551 QualType elementType = VT->getElementType(); 552 553 for (int i = 0; i < maxElements; ++i) { 554 // Don't attempt to go past the end of the init list 555 if (startIndex >= IList->getNumInits()) 556 break; 557 Expr* expr = IList->getInit(startIndex); 558 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 559 unsigned newIndex = 0; 560 hadError |= CheckInitializerListTypes(SubInitList, elementType, 561 true, newIndex); 562 ++startIndex; 563 } else { 564 hadError |= CheckInitializerListTypes(IList, elementType, 565 false, startIndex); 566 } 567 } 568 } 569 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 570 if (DeclType->isStructureType() || DeclType->isUnionType()) { 571 if (startIndex < IList->getNumInits() && !topLevel && 572 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 573 DeclType)) { 574 // We found a compatible struct; per the standard, this initializes the 575 // struct. (The C standard technically says that this only applies for 576 // initializers for declarations with automatic scope; however, this 577 // construct is unambiguous anyway because a struct cannot contain 578 // a type compatible with itself. We'll output an error when we check 579 // if the initializer is constant.) 580 // FIXME: Is a call to CheckSingleInitializer required here? 581 ++startIndex; 582 } else { 583 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 584 585 // If the record is invalid, some of it's members are invalid. To avoid 586 // confusion, we forgo checking the intializer for the entire record. 587 if (structDecl->isInvalidDecl()) 588 return true; 589 590 // If structDecl is a forward declaration, this loop won't do anything; 591 // That's okay, because an error should get printed out elsewhere. It 592 // might be worthwhile to skip over the rest of the initializer, though. 593 int numMembers = structDecl->getNumMembers() - 594 structDecl->hasFlexibleArrayMember(); 595 for (int i = 0; i < numMembers; i++) { 596 // Don't attempt to go past the end of the init list 597 if (startIndex >= IList->getNumInits()) 598 break; 599 FieldDecl * curField = structDecl->getMember(i); 600 if (!curField->getIdentifier()) { 601 // Don't initialize unnamed fields, e.g. "int : 20;" 602 continue; 603 } 604 QualType fieldType = curField->getType(); 605 Expr* expr = IList->getInit(startIndex); 606 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 607 unsigned newStart = 0; 608 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 609 true, newStart); 610 ++startIndex; 611 } else { 612 hadError |= CheckInitializerListTypes(IList, fieldType, 613 false, startIndex); 614 } 615 if (DeclType->isUnionType()) 616 break; 617 } 618 // FIXME: Implement flexible array initialization GCC extension (it's a 619 // really messy extension to implement, unfortunately...the necessary 620 // information isn't actually even here!) 621 } 622 } else if (DeclType->isArrayType()) { 623 // Check for the special-case of initializing an array with a string. 624 if (startIndex < IList->getNumInits()) { 625 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 626 DeclType)) { 627 CheckStringLiteralInit(lit, DeclType); 628 ++startIndex; 629 if (topLevel && startIndex < IList->getNumInits()) { 630 // We have leftover initializers; warn 631 Diag(IList->getInit(startIndex)->getLocStart(), 632 diag::err_excess_initializers_in_char_array_initializer, 633 IList->getInit(startIndex)->getSourceRange()); 634 } 635 return false; 636 } 637 } 638 int maxElements; 639 if (DeclType->isIncompleteArrayType()) { 640 // FIXME: use a proper constant 641 maxElements = 0x7FFFFFFF; 642 } else if (const VariableArrayType *VAT = 643 DeclType->getAsVariableArrayType()) { 644 // Check for VLAs; in standard C it would be possible to check this 645 // earlier, but I don't know where clang accepts VLAs (gcc accepts 646 // them in all sorts of strange places). 647 Diag(VAT->getSizeExpr()->getLocStart(), 648 diag::err_variable_object_no_init, 649 VAT->getSizeExpr()->getSourceRange()); 650 hadError = true; 651 maxElements = 0x7FFFFFFF; 652 } else { 653 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 654 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 655 } 656 QualType elementType = DeclType->getAsArrayType()->getElementType(); 657 int numElements = 0; 658 for (int i = 0; i < maxElements; ++i, ++numElements) { 659 // Don't attempt to go past the end of the init list 660 if (startIndex >= IList->getNumInits()) 661 break; 662 Expr* expr = IList->getInit(startIndex); 663 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 664 unsigned newIndex = 0; 665 hadError |= CheckInitializerListTypes(SubInitList, elementType, 666 true, newIndex); 667 ++startIndex; 668 } else { 669 hadError |= CheckInitializerListTypes(IList, elementType, 670 false, startIndex); 671 } 672 } 673 if (DeclType->isIncompleteArrayType()) { 674 // If this is an incomplete array type, the actual type needs to 675 // be calculated here 676 if (numElements == 0) { 677 // Sizing an array implicitly to zero is not allowed 678 // (It could in theory be allowed, but it doesn't really matter.) 679 Diag(IList->getLocStart(), 680 diag::err_at_least_one_initializer_needed_to_size_array); 681 hadError = true; 682 } else { 683 llvm::APSInt ConstVal(32); 684 ConstVal = numElements; 685 DeclType = Context.getConstantArrayType(elementType, ConstVal, 686 ArrayType::Normal, 0); 687 } 688 } 689 } else { 690 assert(0 && "Aggregate that isn't a function or array?!"); 691 } 692 } else { 693 // In C, all types are either scalars or aggregates, but 694 // additional handling is needed here for C++ (and possibly others?). 695 assert(0 && "Unsupported initializer type"); 696 } 697 698 // If this init list is a base list, we set the type; an initializer doesn't 699 // fundamentally have a type, but this makes the ASTs a bit easier to read 700 if (topLevel) 701 IList->setType(DeclType); 702 703 if (topLevel && startIndex < IList->getNumInits()) { 704 // We have leftover initializers; warn 705 Diag(IList->getInit(startIndex)->getLocStart(), 706 diag::warn_excess_initializers, 707 IList->getInit(startIndex)->getSourceRange()); 708 } 709 return hadError; 710} 711 712bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 713 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 714 // of unknown size ("[]") or an object type that is not a variable array type. 715 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 716 return Diag(VAT->getSizeExpr()->getLocStart(), 717 diag::err_variable_object_no_init, 718 VAT->getSizeExpr()->getSourceRange()); 719 720 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 721 if (!InitList) { 722 // FIXME: Handle wide strings 723 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 724 return CheckStringLiteralInit(strLiteral, DeclType); 725 726 if (DeclType->isArrayType()) 727 return Diag(Init->getLocStart(), 728 diag::err_array_init_list_required, 729 Init->getSourceRange()); 730 731 return CheckSingleInitializer(Init, DeclType); 732 } 733 unsigned newIndex = 0; 734 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 735} 736 737Sema::DeclTy * 738Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 739 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 740 IdentifierInfo *II = D.getIdentifier(); 741 742 // All of these full declarators require an identifier. If it doesn't have 743 // one, the ParsedFreeStandingDeclSpec action should be used. 744 if (II == 0) { 745 Diag(D.getDeclSpec().getSourceRange().getBegin(), 746 diag::err_declarator_need_ident, 747 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 748 return 0; 749 } 750 751 // The scope passed in may not be a decl scope. Zip up the scope tree until 752 // we find one that is. 753 while ((S->getFlags() & Scope::DeclScope) == 0) 754 S = S->getParent(); 755 756 // See if this is a redefinition of a variable in the same scope. 757 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 758 ScopedDecl *New; 759 bool InvalidDecl = false; 760 761 // In C++, the previous declaration we find might be a tag type 762 // (class or enum). In this case, the new declaration will hide the 763 // tag type. 764 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 765 PrevDecl = 0; 766 767 QualType R = GetTypeForDeclarator(D, S); 768 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 769 770 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 771 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 772 if (!NewTD) return 0; 773 774 // Handle attributes prior to checking for duplicates in MergeVarDecl 775 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 776 D.getAttributes()); 777 // Merge the decl with the existing one if appropriate. If the decl is 778 // in an outer scope, it isn't the same thing. 779 if (PrevDecl && S->isDeclScope(PrevDecl)) { 780 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 781 if (NewTD == 0) return 0; 782 } 783 New = NewTD; 784 if (S->getParent() == 0) { 785 // C99 6.7.7p2: If a typedef name specifies a variably modified type 786 // then it shall have block scope. 787 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 788 // FIXME: Diagnostic needs to be fixed. 789 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 790 InvalidDecl = true; 791 } 792 } 793 } else if (R.getTypePtr()->isFunctionType()) { 794 FunctionDecl::StorageClass SC = FunctionDecl::None; 795 switch (D.getDeclSpec().getStorageClassSpec()) { 796 default: assert(0 && "Unknown storage class!"); 797 case DeclSpec::SCS_auto: 798 case DeclSpec::SCS_register: 799 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 800 R.getAsString()); 801 InvalidDecl = true; 802 break; 803 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 804 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 805 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 806 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 807 } 808 809 bool isInline = D.getDeclSpec().isInlineSpecified(); 810 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 811 D.getIdentifierLoc(), 812 II, R, SC, isInline, 813 LastDeclarator); 814 // Handle attributes. 815 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 816 D.getAttributes()); 817 818 // Copy the parameter declarations from the declarator D to 819 // the function declaration NewFD, if they are available. 820 if (D.getNumTypeObjects() > 0 && 821 D.getTypeObject(0).Fun.hasPrototype) { 822 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 823 824 // Create Decl objects for each parameter, adding them to the 825 // FunctionDecl. 826 llvm::SmallVector<ParmVarDecl*, 16> Params; 827 828 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 829 // function that takes no arguments, not a function that takes a 830 // single void argument. 831 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 832 FTI.ArgInfo[0].Param && 833 !((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 834 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 835 // empty arg list, don't push any params. 836 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 837 838 // In C++, the empty parameter-type-list must be spelled "void"; a 839 // typedef of void is not permitted. 840 if (getLangOptions().CPlusPlus && 841 Param->getType() != Context.VoidTy) { 842 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 843 } 844 845 } else { 846 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 847 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 848 } 849 850 NewFD->setParams(&Params[0], Params.size()); 851 } 852 853 // Merge the decl with the existing one if appropriate. Since C functions 854 // are in a flat namespace, make sure we consider decls in outer scopes. 855 if (PrevDecl) { 856 bool Redeclaration = false; 857 NewFD = MergeFunctionDecl(NewFD, PrevDecl, Redeclaration); 858 if (NewFD == 0) return 0; 859 if (Redeclaration) { 860 // Note that the new declaration is a redeclaration of the 861 // older declaration. Then return the older declaration: the 862 // new one is only kept within the set of previous 863 // declarations for this function. 864 FunctionDecl *OldFD = (FunctionDecl *)PrevDecl; 865 OldFD->AddRedeclaration(NewFD); 866 return OldFD; 867 } 868 } 869 New = NewFD; 870 871 // In C++, check default arguments now that we have merged decls. 872 if (getLangOptions().CPlusPlus) 873 CheckCXXDefaultArguments(NewFD); 874 } else { 875 if (R.getTypePtr()->isObjCInterfaceType()) { 876 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 877 D.getIdentifier()->getName()); 878 InvalidDecl = true; 879 } 880 881 VarDecl *NewVD; 882 VarDecl::StorageClass SC; 883 switch (D.getDeclSpec().getStorageClassSpec()) { 884 default: assert(0 && "Unknown storage class!"); 885 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 886 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 887 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 888 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 889 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 890 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 891 } 892 if (S->getParent() == 0) { 893 // C99 6.9p2: The storage-class specifiers auto and register shall not 894 // appear in the declaration specifiers in an external declaration. 895 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 896 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 897 R.getAsString()); 898 InvalidDecl = true; 899 } 900 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 901 II, R, SC, LastDeclarator); 902 } else { 903 NewVD = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 904 II, R, SC, LastDeclarator); 905 } 906 // Handle attributes prior to checking for duplicates in MergeVarDecl 907 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 908 D.getAttributes()); 909 910 // Emit an error if an address space was applied to decl with local storage. 911 // This includes arrays of objects with address space qualifiers, but not 912 // automatic variables that point to other address spaces. 913 // ISO/IEC TR 18037 S5.1.2 914 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 915 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 916 InvalidDecl = true; 917 } 918 // Merge the decl with the existing one if appropriate. If the decl is 919 // in an outer scope, it isn't the same thing. 920 if (PrevDecl && S->isDeclScope(PrevDecl)) { 921 NewVD = MergeVarDecl(NewVD, PrevDecl); 922 if (NewVD == 0) return 0; 923 } 924 New = NewVD; 925 } 926 927 // If this has an identifier, add it to the scope stack. 928 if (II) 929 PushOnScopeChains(New, S); 930 // If any semantic error occurred, mark the decl as invalid. 931 if (D.getInvalidType() || InvalidDecl) 932 New->setInvalidDecl(); 933 934 return New; 935} 936 937bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 938 SourceLocation loc; 939 // FIXME: Remove the isReference check and handle assignment to a reference. 940 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 941 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 942 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 943 return true; 944 } 945 return false; 946} 947 948void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 949 Decl *RealDecl = static_cast<Decl *>(dcl); 950 Expr *Init = static_cast<Expr *>(init); 951 assert(Init && "missing initializer"); 952 953 // If there is no declaration, there was an error parsing it. Just ignore 954 // the initializer. 955 if (RealDecl == 0) { 956 delete Init; 957 return; 958 } 959 960 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 961 if (!VDecl) { 962 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 963 diag::err_illegal_initializer); 964 RealDecl->setInvalidDecl(); 965 return; 966 } 967 // Get the decls type and save a reference for later, since 968 // CheckInitializerTypes may change it. 969 QualType DclT = VDecl->getType(), SavT = DclT; 970 if (VDecl->isBlockVarDecl()) { 971 VarDecl::StorageClass SC = VDecl->getStorageClass(); 972 if (SC == VarDecl::Extern) { // C99 6.7.8p5 973 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 974 VDecl->setInvalidDecl(); 975 } else if (!VDecl->isInvalidDecl()) { 976 if (CheckInitializerTypes(Init, DclT)) 977 VDecl->setInvalidDecl(); 978 if (SC == VarDecl::Static) // C99 6.7.8p4. 979 CheckForConstantInitializer(Init, DclT); 980 } 981 } else if (VDecl->isFileVarDecl()) { 982 if (VDecl->getStorageClass() == VarDecl::Extern) 983 Diag(VDecl->getLocation(), diag::warn_extern_init); 984 if (!VDecl->isInvalidDecl()) 985 if (CheckInitializerTypes(Init, DclT)) 986 VDecl->setInvalidDecl(); 987 988 // C99 6.7.8p4. All file scoped initializers need to be constant. 989 CheckForConstantInitializer(Init, DclT); 990 } 991 // If the type changed, it means we had an incomplete type that was 992 // completed by the initializer. For example: 993 // int ary[] = { 1, 3, 5 }; 994 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 995 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 996 VDecl->setType(DclT); 997 Init->setType(DclT); 998 } 999 1000 // Attach the initializer to the decl. 1001 VDecl->setInit(Init); 1002 return; 1003} 1004 1005/// The declarators are chained together backwards, reverse the list. 1006Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 1007 // Often we have single declarators, handle them quickly. 1008 Decl *GroupDecl = static_cast<Decl*>(group); 1009 if (GroupDecl == 0) 1010 return 0; 1011 1012 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 1013 ScopedDecl *NewGroup = 0; 1014 if (Group->getNextDeclarator() == 0) 1015 NewGroup = Group; 1016 else { // reverse the list. 1017 while (Group) { 1018 ScopedDecl *Next = Group->getNextDeclarator(); 1019 Group->setNextDeclarator(NewGroup); 1020 NewGroup = Group; 1021 Group = Next; 1022 } 1023 } 1024 // Perform semantic analysis that depends on having fully processed both 1025 // the declarator and initializer. 1026 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 1027 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 1028 if (!IDecl) 1029 continue; 1030 QualType T = IDecl->getType(); 1031 1032 // C99 6.7.5.2p2: If an identifier is declared to be an object with 1033 // static storage duration, it shall not have a variable length array. 1034 if ((IDecl->isFileVarDecl() || IDecl->isBlockVarDecl()) && 1035 IDecl->getStorageClass() == VarDecl::Static) { 1036 if (T->getAsVariableArrayType()) { 1037 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 1038 IDecl->setInvalidDecl(); 1039 } 1040 } 1041 // Block scope. C99 6.7p7: If an identifier for an object is declared with 1042 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 1043 if (IDecl->isBlockVarDecl() && 1044 IDecl->getStorageClass() != VarDecl::Extern) { 1045 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1046 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1047 T.getAsString()); 1048 IDecl->setInvalidDecl(); 1049 } 1050 } 1051 // File scope. C99 6.9.2p2: A declaration of an identifier for and 1052 // object that has file scope without an initializer, and without a 1053 // storage-class specifier or with the storage-class specifier "static", 1054 // constitutes a tentative definition. Note: A tentative definition with 1055 // external linkage is valid (C99 6.2.2p5). 1056 if (IDecl && !IDecl->getInit() && 1057 (IDecl->getStorageClass() == VarDecl::Static || 1058 IDecl->getStorageClass() == VarDecl::None)) { 1059 if (T->isIncompleteArrayType()) { 1060 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 1061 // array to be completed. Don't issue a diagnostic. 1062 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1063 // C99 6.9.2p3: If the declaration of an identifier for an object is 1064 // a tentative definition and has internal linkage (C99 6.2.2p3), the 1065 // declared type shall not be an incomplete type. 1066 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1067 T.getAsString()); 1068 IDecl->setInvalidDecl(); 1069 } 1070 } 1071 } 1072 return NewGroup; 1073} 1074 1075/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 1076/// to introduce parameters into function prototype scope. 1077Sema::DeclTy * 1078Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 1079 DeclSpec &DS = D.getDeclSpec(); 1080 1081 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 1082 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1083 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 1084 Diag(DS.getStorageClassSpecLoc(), 1085 diag::err_invalid_storage_class_in_func_decl); 1086 DS.ClearStorageClassSpecs(); 1087 } 1088 if (DS.isThreadSpecified()) { 1089 Diag(DS.getThreadSpecLoc(), 1090 diag::err_invalid_storage_class_in_func_decl); 1091 DS.ClearStorageClassSpecs(); 1092 } 1093 1094 1095 // In this context, we *do not* check D.getInvalidType(). If the declarator 1096 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 1097 // though it will not reflect the user specified type. 1098 QualType parmDeclType = GetTypeForDeclarator(D, S); 1099 1100 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 1101 1102 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 1103 // Can this happen for params? We already checked that they don't conflict 1104 // among each other. Here they can only shadow globals, which is ok. 1105 IdentifierInfo *II = D.getIdentifier(); 1106 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 1107 if (S->isDeclScope(PrevDecl)) { 1108 Diag(D.getIdentifierLoc(), diag::err_param_redefinition, 1109 dyn_cast<NamedDecl>(PrevDecl)->getName()); 1110 1111 // Recover by removing the name 1112 II = 0; 1113 D.SetIdentifier(0, D.getIdentifierLoc()); 1114 } 1115 } 1116 1117 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 1118 // Doing the promotion here has a win and a loss. The win is the type for 1119 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 1120 // code generator). The loss is the orginal type isn't preserved. For example: 1121 // 1122 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1123 // int blockvardecl[5]; 1124 // sizeof(parmvardecl); // size == 4 1125 // sizeof(blockvardecl); // size == 20 1126 // } 1127 // 1128 // For expressions, all implicit conversions are captured using the 1129 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1130 // 1131 // FIXME: If a source translation tool needs to see the original type, then 1132 // we need to consider storing both types (in ParmVarDecl)... 1133 // 1134 if (parmDeclType->isArrayType()) { 1135 // int x[restrict 4] -> int *restrict 1136 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1137 } else if (parmDeclType->isFunctionType()) 1138 parmDeclType = Context.getPointerType(parmDeclType); 1139 1140 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 1141 D.getIdentifierLoc(), II, 1142 parmDeclType, VarDecl::None, 1143 0, 0); 1144 1145 if (D.getInvalidType()) 1146 New->setInvalidDecl(); 1147 1148 if (II) 1149 PushOnScopeChains(New, S); 1150 1151 HandleDeclAttributes(New, D.getAttributes(), 0); 1152 return New; 1153 1154} 1155 1156Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1157 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1158 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1159 "Not a function declarator!"); 1160 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1161 1162 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1163 // for a K&R function. 1164 if (!FTI.hasPrototype) { 1165 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1166 if (FTI.ArgInfo[i].Param == 0) { 1167 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1168 FTI.ArgInfo[i].Ident->getName()); 1169 // Implicitly declare the argument as type 'int' for lack of a better 1170 // type. 1171 DeclSpec DS; 1172 const char* PrevSpec; // unused 1173 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 1174 PrevSpec); 1175 Declarator ParamD(DS, Declarator::KNRTypeListContext); 1176 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 1177 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 1178 } 1179 } 1180 1181 // Since this is a function definition, act as though we have information 1182 // about the arguments. 1183 if (FTI.NumArgs) 1184 FTI.hasPrototype = true; 1185 } else { 1186 // FIXME: Diagnose arguments without names in C. 1187 } 1188 1189 Scope *GlobalScope = FnBodyScope->getParent(); 1190 1191 // See if this is a redefinition. 1192 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1193 GlobalScope); 1194 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1195 const FunctionDecl *Definition; 1196 if (FD->getBody(Definition)) { 1197 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1198 D.getIdentifier()->getName()); 1199 Diag(Definition->getLocation(), diag::err_previous_definition); 1200 } 1201 } 1202 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1203 FunctionDecl *FD = cast<FunctionDecl>(decl); 1204 CurFunctionDecl = FD; 1205 PushDeclContext(FD); 1206 1207 // Check the validity of our function parameters 1208 CheckParmsForFunctionDef(FD); 1209 1210 // Introduce our parameters into the function scope 1211 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1212 ParmVarDecl *Param = FD->getParamDecl(p); 1213 // If this has an identifier, add it to the scope stack. 1214 if (Param->getIdentifier()) 1215 PushOnScopeChains(Param, FnBodyScope); 1216 } 1217 1218 return FD; 1219} 1220 1221Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1222 Decl *dcl = static_cast<Decl *>(D); 1223 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1224 FD->setBody((Stmt*)Body); 1225 assert(FD == CurFunctionDecl && "Function parsing confused"); 1226 CurFunctionDecl = 0; 1227 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1228 MD->setBody((Stmt*)Body); 1229 CurMethodDecl = 0; 1230 } 1231 PopDeclContext(); 1232 // Verify and clean out per-function state. 1233 1234 // Check goto/label use. 1235 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1236 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1237 // Verify that we have no forward references left. If so, there was a goto 1238 // or address of a label taken, but no definition of it. Label fwd 1239 // definitions are indicated with a null substmt. 1240 if (I->second->getSubStmt() == 0) { 1241 LabelStmt *L = I->second; 1242 // Emit error. 1243 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1244 1245 // At this point, we have gotos that use the bogus label. Stitch it into 1246 // the function body so that they aren't leaked and that the AST is well 1247 // formed. 1248 if (Body) { 1249 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1250 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1251 } else { 1252 // The whole function wasn't parsed correctly, just delete this. 1253 delete L; 1254 } 1255 } 1256 } 1257 LabelMap.clear(); 1258 1259 return D; 1260} 1261 1262/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1263/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1264ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1265 IdentifierInfo &II, Scope *S) { 1266 if (getLangOptions().C99) // Extension in C99. 1267 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1268 else // Legal in C90, but warn about it. 1269 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1270 1271 // FIXME: handle stuff like: 1272 // void foo() { extern float X(); } 1273 // void bar() { X(); } <-- implicit decl for X in another scope. 1274 1275 // Set a Declarator for the implicit definition: int foo(); 1276 const char *Dummy; 1277 DeclSpec DS; 1278 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1279 Error = Error; // Silence warning. 1280 assert(!Error && "Error setting up implicit decl!"); 1281 Declarator D(DS, Declarator::BlockContext); 1282 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1283 D.SetIdentifier(&II, Loc); 1284 1285 // Find translation-unit scope to insert this function into. 1286 if (Scope *FnS = S->getFnParent()) 1287 S = FnS->getParent(); // Skip all scopes in a function at once. 1288 while (S->getParent()) 1289 S = S->getParent(); 1290 1291 FunctionDecl *FD = 1292 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1293 FD->setImplicit(); 1294 return FD; 1295} 1296 1297 1298TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1299 ScopedDecl *LastDeclarator) { 1300 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1301 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1302 1303 // Scope manipulation handled by caller. 1304 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1305 D.getIdentifierLoc(), 1306 D.getIdentifier(), 1307 T, LastDeclarator); 1308 if (D.getInvalidType()) 1309 NewTD->setInvalidDecl(); 1310 return NewTD; 1311} 1312 1313/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1314/// former case, Name will be non-null. In the later case, Name will be null. 1315/// TagType indicates what kind of tag this is. TK indicates whether this is a 1316/// reference/declaration/definition of a tag. 1317Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1318 SourceLocation KWLoc, IdentifierInfo *Name, 1319 SourceLocation NameLoc, AttributeList *Attr) { 1320 // If this is a use of an existing tag, it must have a name. 1321 assert((Name != 0 || TK == TK_Definition) && 1322 "Nameless record must be a definition!"); 1323 1324 Decl::Kind Kind; 1325 switch (TagType) { 1326 default: assert(0 && "Unknown tag type!"); 1327 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1328 case DeclSpec::TST_union: Kind = Decl::Union; break; 1329 case DeclSpec::TST_class: Kind = Decl::Class; break; 1330 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1331 } 1332 1333 // If this is a named struct, check to see if there was a previous forward 1334 // declaration or definition. 1335 if (TagDecl *PrevDecl = 1336 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1337 1338 // If this is a use of a previous tag, or if the tag is already declared in 1339 // the same scope (so that the definition/declaration completes or 1340 // rementions the tag), reuse the decl. 1341 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1342 // Make sure that this wasn't declared as an enum and now used as a struct 1343 // or something similar. 1344 if (PrevDecl->getKind() != Kind) { 1345 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1346 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1347 } 1348 1349 // If this is a use or a forward declaration, we're good. 1350 if (TK != TK_Definition) 1351 return PrevDecl; 1352 1353 // Diagnose attempts to redefine a tag. 1354 if (PrevDecl->isDefinition()) { 1355 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1356 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1357 // If this is a redefinition, recover by making this struct be 1358 // anonymous, which will make any later references get the previous 1359 // definition. 1360 Name = 0; 1361 } else { 1362 // Okay, this is definition of a previously declared or referenced tag. 1363 // Move the location of the decl to be the definition site. 1364 PrevDecl->setLocation(NameLoc); 1365 return PrevDecl; 1366 } 1367 } 1368 // If we get here, this is a definition of a new struct type in a nested 1369 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1370 // type. 1371 } 1372 1373 // If there is an identifier, use the location of the identifier as the 1374 // location of the decl, otherwise use the location of the struct/union 1375 // keyword. 1376 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1377 1378 // Otherwise, if this is the first time we've seen this tag, create the decl. 1379 TagDecl *New; 1380 switch (Kind) { 1381 default: assert(0 && "Unknown tag kind!"); 1382 case Decl::Enum: 1383 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1384 // enum X { A, B, C } D; D should chain to X. 1385 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1386 // If this is an undefined enum, warn. 1387 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1388 break; 1389 case Decl::Union: 1390 case Decl::Struct: 1391 case Decl::Class: 1392 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1393 // struct X { int A; } D; D should chain to X. 1394 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1395 break; 1396 } 1397 1398 // If this has an identifier, add it to the scope stack. 1399 if (Name) { 1400 // The scope passed in may not be a decl scope. Zip up the scope tree until 1401 // we find one that is. 1402 while ((S->getFlags() & Scope::DeclScope) == 0) 1403 S = S->getParent(); 1404 1405 // Add it to the decl chain. 1406 PushOnScopeChains(New, S); 1407 } 1408 1409 HandleDeclAttributes(New, Attr, 0); 1410 return New; 1411} 1412 1413/// ActOnField - Each field of a struct/union/class is passed into this in order 1414/// to create a FieldDecl object for it. 1415Sema::DeclTy *Sema::ActOnField(Scope *S, 1416 SourceLocation DeclStart, 1417 Declarator &D, ExprTy *BitfieldWidth) { 1418 IdentifierInfo *II = D.getIdentifier(); 1419 Expr *BitWidth = (Expr*)BitfieldWidth; 1420 SourceLocation Loc = DeclStart; 1421 if (II) Loc = D.getIdentifierLoc(); 1422 1423 // FIXME: Unnamed fields can be handled in various different ways, for 1424 // example, unnamed unions inject all members into the struct namespace! 1425 1426 1427 if (BitWidth) { 1428 // TODO: Validate. 1429 //printf("WARNING: BITFIELDS IGNORED!\n"); 1430 1431 // 6.7.2.1p3 1432 // 6.7.2.1p4 1433 1434 } else { 1435 // Not a bitfield. 1436 1437 // validate II. 1438 1439 } 1440 1441 QualType T = GetTypeForDeclarator(D, S); 1442 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1443 bool InvalidDecl = false; 1444 1445 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1446 // than a variably modified type. 1447 if (T->isVariablyModifiedType()) { 1448 // FIXME: This diagnostic needs work 1449 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1450 InvalidDecl = true; 1451 } 1452 // FIXME: Chain fielddecls together. 1453 FieldDecl *NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1454 1455 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1456 D.getAttributes()); 1457 1458 if (D.getInvalidType() || InvalidDecl) 1459 NewFD->setInvalidDecl(); 1460 return NewFD; 1461} 1462 1463/// TranslateIvarVisibility - Translate visibility from a token ID to an 1464/// AST enum value. 1465static ObjCIvarDecl::AccessControl 1466TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1467 switch (ivarVisibility) { 1468 case tok::objc_private: return ObjCIvarDecl::Private; 1469 case tok::objc_public: return ObjCIvarDecl::Public; 1470 case tok::objc_protected: return ObjCIvarDecl::Protected; 1471 case tok::objc_package: return ObjCIvarDecl::Package; 1472 default: assert(false && "Unknown visitibility kind"); 1473 } 1474} 1475 1476/// ActOnIvar - Each ivar field of an objective-c class is passed into this 1477/// in order to create an IvarDecl object for it. 1478Sema::DeclTy *Sema::ActOnIvar(Scope *S, 1479 SourceLocation DeclStart, 1480 Declarator &D, ExprTy *BitfieldWidth, 1481 tok::ObjCKeywordKind Visibility) { 1482 IdentifierInfo *II = D.getIdentifier(); 1483 Expr *BitWidth = (Expr*)BitfieldWidth; 1484 SourceLocation Loc = DeclStart; 1485 if (II) Loc = D.getIdentifierLoc(); 1486 1487 // FIXME: Unnamed fields can be handled in various different ways, for 1488 // example, unnamed unions inject all members into the struct namespace! 1489 1490 1491 if (BitWidth) { 1492 // TODO: Validate. 1493 //printf("WARNING: BITFIELDS IGNORED!\n"); 1494 1495 // 6.7.2.1p3 1496 // 6.7.2.1p4 1497 1498 } else { 1499 // Not a bitfield. 1500 1501 // validate II. 1502 1503 } 1504 1505 QualType T = GetTypeForDeclarator(D, S); 1506 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1507 bool InvalidDecl = false; 1508 1509 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1510 // than a variably modified type. 1511 if (T->isVariablyModifiedType()) { 1512 // FIXME: This diagnostic needs work 1513 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1514 InvalidDecl = true; 1515 } 1516 1517 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T); 1518 1519 HandleDeclAttributes(NewID, D.getDeclSpec().getAttributes(), 1520 D.getAttributes()); 1521 1522 if (D.getInvalidType() || InvalidDecl) 1523 NewID->setInvalidDecl(); 1524 // If we have visibility info, make sure the AST is set accordingly. 1525 if (Visibility != tok::objc_not_keyword) 1526 NewID->setAccessControl(TranslateIvarVisibility(Visibility)); 1527 return NewID; 1528} 1529 1530void Sema::ActOnFields(Scope* S, 1531 SourceLocation RecLoc, DeclTy *RecDecl, 1532 DeclTy **Fields, unsigned NumFields, 1533 SourceLocation LBrac, SourceLocation RBrac) { 1534 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1535 assert(EnclosingDecl && "missing record or interface decl"); 1536 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1537 1538 if (Record && Record->isDefinition()) { 1539 // Diagnose code like: 1540 // struct S { struct S {} X; }; 1541 // We discover this when we complete the outer S. Reject and ignore the 1542 // outer S. 1543 Diag(Record->getLocation(), diag::err_nested_redefinition, 1544 Record->getKindName()); 1545 Diag(RecLoc, diag::err_previous_definition); 1546 Record->setInvalidDecl(); 1547 return; 1548 } 1549 // Verify that all the fields are okay. 1550 unsigned NumNamedMembers = 0; 1551 llvm::SmallVector<FieldDecl*, 32> RecFields; 1552 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1553 1554 for (unsigned i = 0; i != NumFields; ++i) { 1555 1556 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1557 assert(FD && "missing field decl"); 1558 1559 // Remember all fields. 1560 RecFields.push_back(FD); 1561 1562 // Get the type for the field. 1563 Type *FDTy = FD->getType().getTypePtr(); 1564 1565 // C99 6.7.2.1p2 - A field may not be a function type. 1566 if (FDTy->isFunctionType()) { 1567 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1568 FD->getName()); 1569 FD->setInvalidDecl(); 1570 EnclosingDecl->setInvalidDecl(); 1571 continue; 1572 } 1573 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1574 if (FDTy->isIncompleteType()) { 1575 if (!Record) { // Incomplete ivar type is always an error. 1576 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1577 FD->setInvalidDecl(); 1578 EnclosingDecl->setInvalidDecl(); 1579 continue; 1580 } 1581 if (i != NumFields-1 || // ... that the last member ... 1582 Record->getKind() != Decl::Struct || // ... of a structure ... 1583 !FDTy->isArrayType()) { //... may have incomplete array type. 1584 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1585 FD->setInvalidDecl(); 1586 EnclosingDecl->setInvalidDecl(); 1587 continue; 1588 } 1589 if (NumNamedMembers < 1) { //... must have more than named member ... 1590 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1591 FD->getName()); 1592 FD->setInvalidDecl(); 1593 EnclosingDecl->setInvalidDecl(); 1594 continue; 1595 } 1596 // Okay, we have a legal flexible array member at the end of the struct. 1597 if (Record) 1598 Record->setHasFlexibleArrayMember(true); 1599 } 1600 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1601 /// field of another structure or the element of an array. 1602 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1603 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1604 // If this is a member of a union, then entire union becomes "flexible". 1605 if (Record && Record->getKind() == Decl::Union) { 1606 Record->setHasFlexibleArrayMember(true); 1607 } else { 1608 // If this is a struct/class and this is not the last element, reject 1609 // it. Note that GCC supports variable sized arrays in the middle of 1610 // structures. 1611 if (i != NumFields-1) { 1612 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1613 FD->getName()); 1614 FD->setInvalidDecl(); 1615 EnclosingDecl->setInvalidDecl(); 1616 continue; 1617 } 1618 // We support flexible arrays at the end of structs in other structs 1619 // as an extension. 1620 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1621 FD->getName()); 1622 if (Record) 1623 Record->setHasFlexibleArrayMember(true); 1624 } 1625 } 1626 } 1627 /// A field cannot be an Objective-c object 1628 if (FDTy->isObjCInterfaceType()) { 1629 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1630 FD->getName()); 1631 FD->setInvalidDecl(); 1632 EnclosingDecl->setInvalidDecl(); 1633 continue; 1634 } 1635 // Keep track of the number of named members. 1636 if (IdentifierInfo *II = FD->getIdentifier()) { 1637 // Detect duplicate member names. 1638 if (!FieldIDs.insert(II)) { 1639 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1640 // Find the previous decl. 1641 SourceLocation PrevLoc; 1642 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1643 assert(i != e && "Didn't find previous def!"); 1644 if (RecFields[i]->getIdentifier() == II) { 1645 PrevLoc = RecFields[i]->getLocation(); 1646 break; 1647 } 1648 } 1649 Diag(PrevLoc, diag::err_previous_definition); 1650 FD->setInvalidDecl(); 1651 EnclosingDecl->setInvalidDecl(); 1652 continue; 1653 } 1654 ++NumNamedMembers; 1655 } 1656 } 1657 1658 // Okay, we successfully defined 'Record'. 1659 if (Record) { 1660 Record->defineBody(&RecFields[0], RecFields.size()); 1661 Consumer.HandleTagDeclDefinition(Record); 1662 } else { 1663 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1664 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1665 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1666 else if (ObjCImplementationDecl *IMPDecl = 1667 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1668 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1669 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1670 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1671 } 1672 } 1673} 1674 1675Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1676 DeclTy *lastEnumConst, 1677 SourceLocation IdLoc, IdentifierInfo *Id, 1678 SourceLocation EqualLoc, ExprTy *val) { 1679 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1680 EnumConstantDecl *LastEnumConst = 1681 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1682 Expr *Val = static_cast<Expr*>(val); 1683 1684 // The scope passed in may not be a decl scope. Zip up the scope tree until 1685 // we find one that is. 1686 while ((S->getFlags() & Scope::DeclScope) == 0) 1687 S = S->getParent(); 1688 1689 // Verify that there isn't already something declared with this name in this 1690 // scope. 1691 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1692 if (S->isDeclScope(PrevDecl)) { 1693 if (isa<EnumConstantDecl>(PrevDecl)) 1694 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1695 else 1696 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1697 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1698 delete Val; 1699 return 0; 1700 } 1701 } 1702 1703 llvm::APSInt EnumVal(32); 1704 QualType EltTy; 1705 if (Val) { 1706 // Make sure to promote the operand type to int. 1707 UsualUnaryConversions(Val); 1708 1709 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1710 SourceLocation ExpLoc; 1711 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1712 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1713 Id->getName()); 1714 delete Val; 1715 Val = 0; // Just forget about it. 1716 } else { 1717 EltTy = Val->getType(); 1718 } 1719 } 1720 1721 if (!Val) { 1722 if (LastEnumConst) { 1723 // Assign the last value + 1. 1724 EnumVal = LastEnumConst->getInitVal(); 1725 ++EnumVal; 1726 1727 // Check for overflow on increment. 1728 if (EnumVal < LastEnumConst->getInitVal()) 1729 Diag(IdLoc, diag::warn_enum_value_overflow); 1730 1731 EltTy = LastEnumConst->getType(); 1732 } else { 1733 // First value, set to zero. 1734 EltTy = Context.IntTy; 1735 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1736 } 1737 } 1738 1739 EnumConstantDecl *New = 1740 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1741 Val, EnumVal, 1742 LastEnumConst); 1743 1744 // Register this decl in the current scope stack. 1745 PushOnScopeChains(New, S); 1746 return New; 1747} 1748 1749void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1750 DeclTy **Elements, unsigned NumElements) { 1751 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1752 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1753 1754 // TODO: If the result value doesn't fit in an int, it must be a long or long 1755 // long value. ISO C does not support this, but GCC does as an extension, 1756 // emit a warning. 1757 unsigned IntWidth = Context.Target.getIntWidth(); 1758 1759 // Verify that all the values are okay, compute the size of the values, and 1760 // reverse the list. 1761 unsigned NumNegativeBits = 0; 1762 unsigned NumPositiveBits = 0; 1763 1764 // Keep track of whether all elements have type int. 1765 bool AllElementsInt = true; 1766 1767 EnumConstantDecl *EltList = 0; 1768 for (unsigned i = 0; i != NumElements; ++i) { 1769 EnumConstantDecl *ECD = 1770 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1771 if (!ECD) continue; // Already issued a diagnostic. 1772 1773 // If the enum value doesn't fit in an int, emit an extension warning. 1774 const llvm::APSInt &InitVal = ECD->getInitVal(); 1775 assert(InitVal.getBitWidth() >= IntWidth && 1776 "Should have promoted value to int"); 1777 if (InitVal.getBitWidth() > IntWidth) { 1778 llvm::APSInt V(InitVal); 1779 V.trunc(IntWidth); 1780 V.extend(InitVal.getBitWidth()); 1781 if (V != InitVal) 1782 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1783 InitVal.toString()); 1784 } 1785 1786 // Keep track of the size of positive and negative values. 1787 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1788 NumPositiveBits = std::max(NumPositiveBits, 1789 (unsigned)InitVal.getActiveBits()); 1790 else 1791 NumNegativeBits = std::max(NumNegativeBits, 1792 (unsigned)InitVal.getMinSignedBits()); 1793 1794 // Keep track of whether every enum element has type int (very commmon). 1795 if (AllElementsInt) 1796 AllElementsInt = ECD->getType() == Context.IntTy; 1797 1798 ECD->setNextDeclarator(EltList); 1799 EltList = ECD; 1800 } 1801 1802 // Figure out the type that should be used for this enum. 1803 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1804 QualType BestType; 1805 unsigned BestWidth; 1806 1807 if (NumNegativeBits) { 1808 // If there is a negative value, figure out the smallest integer type (of 1809 // int/long/longlong) that fits. 1810 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1811 BestType = Context.IntTy; 1812 BestWidth = IntWidth; 1813 } else { 1814 BestWidth = Context.Target.getLongWidth(); 1815 1816 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1817 BestType = Context.LongTy; 1818 else { 1819 BestWidth = Context.Target.getLongLongWidth(); 1820 1821 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1822 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1823 BestType = Context.LongLongTy; 1824 } 1825 } 1826 } else { 1827 // If there is no negative value, figure out which of uint, ulong, ulonglong 1828 // fits. 1829 if (NumPositiveBits <= IntWidth) { 1830 BestType = Context.UnsignedIntTy; 1831 BestWidth = IntWidth; 1832 } else if (NumPositiveBits <= 1833 (BestWidth = Context.Target.getLongWidth())) { 1834 BestType = Context.UnsignedLongTy; 1835 } else { 1836 BestWidth = Context.Target.getLongLongWidth(); 1837 assert(NumPositiveBits <= BestWidth && 1838 "How could an initializer get larger than ULL?"); 1839 BestType = Context.UnsignedLongLongTy; 1840 } 1841 } 1842 1843 // Loop over all of the enumerator constants, changing their types to match 1844 // the type of the enum if needed. 1845 for (unsigned i = 0; i != NumElements; ++i) { 1846 EnumConstantDecl *ECD = 1847 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1848 if (!ECD) continue; // Already issued a diagnostic. 1849 1850 // Standard C says the enumerators have int type, but we allow, as an 1851 // extension, the enumerators to be larger than int size. If each 1852 // enumerator value fits in an int, type it as an int, otherwise type it the 1853 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1854 // that X has type 'int', not 'unsigned'. 1855 if (ECD->getType() == Context.IntTy) { 1856 // Make sure the init value is signed. 1857 llvm::APSInt IV = ECD->getInitVal(); 1858 IV.setIsSigned(true); 1859 ECD->setInitVal(IV); 1860 continue; // Already int type. 1861 } 1862 1863 // Determine whether the value fits into an int. 1864 llvm::APSInt InitVal = ECD->getInitVal(); 1865 bool FitsInInt; 1866 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1867 FitsInInt = InitVal.getActiveBits() < IntWidth; 1868 else 1869 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1870 1871 // If it fits into an integer type, force it. Otherwise force it to match 1872 // the enum decl type. 1873 QualType NewTy; 1874 unsigned NewWidth; 1875 bool NewSign; 1876 if (FitsInInt) { 1877 NewTy = Context.IntTy; 1878 NewWidth = IntWidth; 1879 NewSign = true; 1880 } else if (ECD->getType() == BestType) { 1881 // Already the right type! 1882 continue; 1883 } else { 1884 NewTy = BestType; 1885 NewWidth = BestWidth; 1886 NewSign = BestType->isSignedIntegerType(); 1887 } 1888 1889 // Adjust the APSInt value. 1890 InitVal.extOrTrunc(NewWidth); 1891 InitVal.setIsSigned(NewSign); 1892 ECD->setInitVal(InitVal); 1893 1894 // Adjust the Expr initializer and type. 1895 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1896 ECD->setType(NewTy); 1897 } 1898 1899 Enum->defineElements(EltList, BestType); 1900 Consumer.HandleTagDeclDefinition(Enum); 1901} 1902 1903Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1904 ExprTy *expr) { 1905 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1906 1907 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1908} 1909 1910Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1911 SourceLocation LBrace, 1912 SourceLocation RBrace, 1913 const char *Lang, 1914 unsigned StrSize, 1915 DeclTy *D) { 1916 LinkageSpecDecl::LanguageIDs Language; 1917 Decl *dcl = static_cast<Decl *>(D); 1918 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1919 Language = LinkageSpecDecl::lang_c; 1920 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1921 Language = LinkageSpecDecl::lang_cxx; 1922 else { 1923 Diag(Loc, diag::err_bad_language); 1924 return 0; 1925 } 1926 1927 // FIXME: Add all the various semantics of linkage specifications 1928 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1929} 1930 1931void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1932 1933 switch (Attr->getKind()) { 1934 case AttributeList::AT_vector_size: 1935 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1936 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1937 if (!newType.isNull()) // install the new vector type into the decl 1938 vDecl->setType(newType); 1939 } 1940 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1941 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1942 Attr); 1943 if (!newType.isNull()) // install the new vector type into the decl 1944 tDecl->setUnderlyingType(newType); 1945 } 1946 break; 1947 case AttributeList::AT_ext_vector_type: 1948 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1949 HandleExtVectorTypeAttribute(tDecl, Attr); 1950 else 1951 Diag(Attr->getLoc(), 1952 diag::err_typecheck_ext_vector_not_typedef); 1953 break; 1954 case AttributeList::AT_address_space: 1955 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1956 QualType newType = HandleAddressSpaceTypeAttribute( 1957 tDecl->getUnderlyingType(), 1958 Attr); 1959 tDecl->setUnderlyingType(newType); 1960 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1961 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1962 Attr); 1963 // install the new addr spaced type into the decl 1964 vDecl->setType(newType); 1965 } 1966 break; 1967 case AttributeList::AT_deprecated: 1968 HandleDeprecatedAttribute(New, Attr); 1969 break; 1970 case AttributeList::AT_visibility: 1971 HandleVisibilityAttribute(New, Attr); 1972 break; 1973 case AttributeList::AT_weak: 1974 HandleWeakAttribute(New, Attr); 1975 break; 1976 case AttributeList::AT_dllimport: 1977 HandleDLLImportAttribute(New, Attr); 1978 break; 1979 case AttributeList::AT_dllexport: 1980 HandleDLLExportAttribute(New, Attr); 1981 break; 1982 case AttributeList::AT_nothrow: 1983 HandleNothrowAttribute(New, Attr); 1984 break; 1985 case AttributeList::AT_stdcall: 1986 HandleStdCallAttribute(New, Attr); 1987 break; 1988 case AttributeList::AT_fastcall: 1989 HandleFastCallAttribute(New, Attr); 1990 break; 1991 case AttributeList::AT_aligned: 1992 HandleAlignedAttribute(New, Attr); 1993 break; 1994 case AttributeList::AT_packed: 1995 HandlePackedAttribute(New, Attr); 1996 break; 1997 case AttributeList::AT_annotate: 1998 HandleAnnotateAttribute(New, Attr); 1999 break; 2000 case AttributeList::AT_noreturn: 2001 HandleNoReturnAttribute(New, Attr); 2002 break; 2003 case AttributeList::AT_format: 2004 HandleFormatAttribute(New, Attr); 2005 break; 2006 default: 2007#if 0 2008 // TODO: when we have the full set of attributes, warn about unknown ones. 2009 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 2010 Attr->getName()->getName()); 2011#endif 2012 break; 2013 } 2014} 2015 2016void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 2017 AttributeList *declarator_postfix) { 2018 while (declspec_prefix) { 2019 HandleDeclAttribute(New, declspec_prefix); 2020 declspec_prefix = declspec_prefix->getNext(); 2021 } 2022 while (declarator_postfix) { 2023 HandleDeclAttribute(New, declarator_postfix); 2024 declarator_postfix = declarator_postfix->getNext(); 2025 } 2026} 2027 2028void Sema::HandleExtVectorTypeAttribute(TypedefDecl *tDecl, 2029 AttributeList *rawAttr) { 2030 QualType curType = tDecl->getUnderlyingType(); 2031 // check the attribute arguments. 2032 if (rawAttr->getNumArgs() != 1) { 2033 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2034 std::string("1")); 2035 return; 2036 } 2037 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2038 llvm::APSInt vecSize(32); 2039 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2040 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2041 "ext_vector_type", sizeExpr->getSourceRange()); 2042 return; 2043 } 2044 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 2045 // in conjunction with complex types (pointers, arrays, functions, etc.). 2046 Type *canonType = curType.getCanonicalType().getTypePtr(); 2047 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2048 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2049 curType.getCanonicalType().getAsString()); 2050 return; 2051 } 2052 // unlike gcc's vector_size attribute, the size is specified as the 2053 // number of elements, not the number of bytes. 2054 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 2055 2056 if (vectorSize == 0) { 2057 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2058 sizeExpr->getSourceRange()); 2059 return; 2060 } 2061 // Instantiate/Install the vector type, the number of elements is > 0. 2062 tDecl->setUnderlyingType(Context.getExtVectorType(curType, vectorSize)); 2063 // Remember this typedef decl, we will need it later for diagnostics. 2064 ExtVectorDecls.push_back(tDecl); 2065} 2066 2067QualType Sema::HandleVectorTypeAttribute(QualType curType, 2068 AttributeList *rawAttr) { 2069 // check the attribute arugments. 2070 if (rawAttr->getNumArgs() != 1) { 2071 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2072 std::string("1")); 2073 return QualType(); 2074 } 2075 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2076 llvm::APSInt vecSize(32); 2077 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2078 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2079 "vector_size", sizeExpr->getSourceRange()); 2080 return QualType(); 2081 } 2082 // navigate to the base type - we need to provide for vector pointers, 2083 // vector arrays, and functions returning vectors. 2084 Type *canonType = curType.getCanonicalType().getTypePtr(); 2085 2086 if (canonType->isPointerType() || canonType->isArrayType() || 2087 canonType->isFunctionType()) { 2088 assert(0 && "HandleVector(): Complex type construction unimplemented"); 2089 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 2090 do { 2091 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 2092 canonType = PT->getPointeeType().getTypePtr(); 2093 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 2094 canonType = AT->getElementType().getTypePtr(); 2095 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 2096 canonType = FT->getResultType().getTypePtr(); 2097 } while (canonType->isPointerType() || canonType->isArrayType() || 2098 canonType->isFunctionType()); 2099 */ 2100 } 2101 // the base type must be integer or float. 2102 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2103 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2104 curType.getCanonicalType().getAsString()); 2105 return QualType(); 2106 } 2107 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 2108 // vecSize is specified in bytes - convert to bits. 2109 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 2110 2111 // the vector size needs to be an integral multiple of the type size. 2112 if (vectorSize % typeSize) { 2113 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 2114 sizeExpr->getSourceRange()); 2115 return QualType(); 2116 } 2117 if (vectorSize == 0) { 2118 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2119 sizeExpr->getSourceRange()); 2120 return QualType(); 2121 } 2122 // Instantiate the vector type, the number of elements is > 0, and not 2123 // required to be a power of 2, unlike GCC. 2124 return Context.getVectorType(curType, vectorSize/typeSize); 2125} 2126 2127void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 2128 // check the attribute arguments. 2129 if (rawAttr->getNumArgs() > 0) { 2130 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2131 std::string("0")); 2132 return; 2133 } 2134 2135 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 2136 TD->addAttr(new PackedAttr); 2137 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 2138 // If the alignment is less than or equal to 8 bits, the packed attribute 2139 // has no effect. 2140 if (Context.getTypeAlign(FD->getType()) <= 8) 2141 Diag(rawAttr->getLoc(), 2142 diag::warn_attribute_ignored_for_field_of_type, 2143 rawAttr->getName()->getName(), FD->getType().getAsString()); 2144 else 2145 FD->addAttr(new PackedAttr); 2146 } else 2147 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2148 rawAttr->getName()->getName()); 2149} 2150 2151void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2152 // check the attribute arguments. 2153 if (rawAttr->getNumArgs() != 0) { 2154 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2155 std::string("0")); 2156 return; 2157 } 2158 2159 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2160 2161 if (!Fn) { 2162 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2163 "noreturn", "function"); 2164 return; 2165 } 2166 2167 d->addAttr(new NoReturnAttr()); 2168} 2169 2170void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2171 // check the attribute arguments. 2172 if (rawAttr->getNumArgs() != 0) { 2173 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2174 std::string("0")); 2175 return; 2176 } 2177 2178 d->addAttr(new DeprecatedAttr()); 2179} 2180 2181void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2182 // check the attribute arguments. 2183 if (rawAttr->getNumArgs() != 1) { 2184 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2185 std::string("1")); 2186 return; 2187 } 2188 2189 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2190 Arg = Arg->IgnoreParenCasts(); 2191 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2192 2193 if (Str == 0 || Str->isWide()) { 2194 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2195 "visibility", std::string("1")); 2196 return; 2197 } 2198 2199 const char *TypeStr = Str->getStrData(); 2200 unsigned TypeLen = Str->getByteLength(); 2201 llvm::GlobalValue::VisibilityTypes type; 2202 2203 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2204 type = llvm::GlobalValue::DefaultVisibility; 2205 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2206 type = llvm::GlobalValue::HiddenVisibility; 2207 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2208 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2209 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2210 type = llvm::GlobalValue::ProtectedVisibility; 2211 else { 2212 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2213 "visibility", TypeStr); 2214 return; 2215 } 2216 2217 d->addAttr(new VisibilityAttr(type)); 2218} 2219 2220void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2221 // check the attribute arguments. 2222 if (rawAttr->getNumArgs() != 0) { 2223 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2224 std::string("0")); 2225 return; 2226 } 2227 2228 d->addAttr(new WeakAttr()); 2229} 2230 2231void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2232 // check the attribute arguments. 2233 if (rawAttr->getNumArgs() != 0) { 2234 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2235 std::string("0")); 2236 return; 2237 } 2238 2239 d->addAttr(new DLLImportAttr()); 2240} 2241 2242void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2243 // check the attribute arguments. 2244 if (rawAttr->getNumArgs() != 0) { 2245 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2246 std::string("0")); 2247 return; 2248 } 2249 2250 d->addAttr(new DLLExportAttr()); 2251} 2252 2253void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2254 // check the attribute arguments. 2255 if (rawAttr->getNumArgs() != 0) { 2256 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2257 std::string("0")); 2258 return; 2259 } 2260 2261 d->addAttr(new StdCallAttr()); 2262} 2263 2264void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2265 // check the attribute arguments. 2266 if (rawAttr->getNumArgs() != 0) { 2267 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2268 std::string("0")); 2269 return; 2270 } 2271 2272 d->addAttr(new FastCallAttr()); 2273} 2274 2275void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2276 // check the attribute arguments. 2277 if (rawAttr->getNumArgs() != 0) { 2278 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2279 std::string("0")); 2280 return; 2281 } 2282 2283 d->addAttr(new NoThrowAttr()); 2284} 2285 2286static const FunctionTypeProto *getFunctionProto(Decl *d) { 2287 QualType Ty; 2288 2289 if (ValueDecl *decl = dyn_cast<ValueDecl>(d)) 2290 Ty = decl->getType(); 2291 else if (FieldDecl *decl = dyn_cast<FieldDecl>(d)) 2292 Ty = decl->getType(); 2293 else 2294 return 0; 2295 2296 if (Ty->isFunctionPointerType()) { 2297 const PointerType *PtrTy = Ty->getAsPointerType(); 2298 Ty = PtrTy->getPointeeType(); 2299 } 2300 2301 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2302 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2303 2304 return 0; 2305} 2306 2307 2308/// Handle __attribute__((format(type,idx,firstarg))) attributes 2309/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2310void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2311 2312 if (!rawAttr->getParameterName()) { 2313 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2314 "format", std::string("1")); 2315 return; 2316 } 2317 2318 if (rawAttr->getNumArgs() != 2) { 2319 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2320 std::string("3")); 2321 return; 2322 } 2323 2324 // GCC ignores the format attribute on K&R style function 2325 // prototypes, so we ignore it as well 2326 const FunctionTypeProto *proto = getFunctionProto(d); 2327 2328 if (!proto) { 2329 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2330 "format", "function"); 2331 return; 2332 } 2333 2334 // FIXME: in C++ the implicit 'this' function parameter also counts. 2335 // this is needed in order to be compatible with GCC 2336 // the index must start in 1 and the limit is numargs+1 2337 unsigned NumArgs = proto->getNumArgs(); 2338 unsigned FirstIdx = 1; 2339 2340 const char *Format = rawAttr->getParameterName()->getName(); 2341 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2342 2343 // Normalize the argument, __foo__ becomes foo. 2344 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2345 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2346 Format += 2; 2347 FormatLen -= 4; 2348 } 2349 2350 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2351 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2352 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2353 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2354 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2355 "format", rawAttr->getParameterName()->getName()); 2356 return; 2357 } 2358 2359 // checks for the 2nd argument 2360 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2361 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2362 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2363 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2364 "format", std::string("2"), IdxExpr->getSourceRange()); 2365 return; 2366 } 2367 2368 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2369 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2370 "format", std::string("2"), IdxExpr->getSourceRange()); 2371 return; 2372 } 2373 2374 // make sure the format string is really a string 2375 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2376 if (!Ty->isPointerType() || 2377 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2378 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2379 IdxExpr->getSourceRange()); 2380 return; 2381 } 2382 2383 2384 // check the 3rd argument 2385 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2386 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2387 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2388 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2389 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2390 return; 2391 } 2392 2393 // check if the function is variadic if the 3rd argument non-zero 2394 if (FirstArg != 0) { 2395 if (proto->isVariadic()) { 2396 ++NumArgs; // +1 for ... 2397 } else { 2398 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2399 return; 2400 } 2401 } 2402 2403 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2404 // the input is just the current time + the format string 2405 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2406 if (FirstArg != 0) { 2407 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2408 FirstArgExpr->getSourceRange()); 2409 return; 2410 } 2411 // if 0 it disables parameter checking (to use with e.g. va_list) 2412 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2413 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2414 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2415 return; 2416 } 2417 2418 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2419 Idx.getZExtValue(), FirstArg.getZExtValue())); 2420} 2421 2422void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2423 // check the attribute arguments. 2424 if (rawAttr->getNumArgs() != 1) { 2425 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2426 std::string("1")); 2427 return; 2428 } 2429 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2430 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2431 2432 // Make sure that there is a string literal as the annotation's single 2433 // argument. 2434 if (!SE) { 2435 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2436 return; 2437 } 2438 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2439 SE->getByteLength()))); 2440} 2441 2442void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2443{ 2444 // check the attribute arguments. 2445 if (rawAttr->getNumArgs() > 1) { 2446 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2447 std::string("1")); 2448 return; 2449 } 2450 2451 unsigned Align = 0; 2452 2453 if (rawAttr->getNumArgs() == 0) { 2454 // FIXME: This should be the target specific maximum alignment. 2455 // (For now we just use 128 bits which is the maximum on X86. 2456 Align = 128; 2457 return; 2458 } else { 2459 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2460 llvm::APSInt alignment(32); 2461 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2462 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2463 "aligned", alignmentExpr->getSourceRange()); 2464 return; 2465 } 2466 2467 Align = alignment.getZExtValue() * 8; 2468 } 2469 2470 d->addAttr(new AlignedAttr(Align)); 2471} 2472