SemaDecl.cpp revision 04421087832a031c90bd58f128c7c0e741db8dd2
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) || isa<ObjCInterfaceDecl>(IIDecl))) 39 return IIDecl; 40 return 0; 41} 42 43void Sema::PushDeclContext(DeclContext *CD) { 44 assert(CD->getParent() == CurContext && 45 "The next DeclContext should be directly contained in the current one."); 46 CurContext = CD; 47} 48 49void Sema::PopDeclContext() { 50 assert(CurContext && "DeclContext imbalance!"); 51 CurContext = CurContext->getParent(); 52} 53 54void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 55 if (S->decl_empty()) return; 56 assert((S->getFlags() & Scope::DeclScope) &&"Scope shouldn't contain decls!"); 57 58 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 59 I != E; ++I) { 60 Decl *TmpD = static_cast<Decl*>(*I); 61 assert(TmpD && "This decl didn't get pushed??"); 62 ScopedDecl *D = dyn_cast<ScopedDecl>(TmpD); 63 assert(D && "This decl isn't a ScopedDecl?"); 64 65 IdentifierInfo *II = D->getIdentifier(); 66 if (!II) continue; 67 68 // Unlink this decl from the identifier. Because the scope contains decls 69 // in an unordered collection, and because we have multiple identifier 70 // namespaces (e.g. tag, normal, label),the decl may not be the first entry. 71 if (II->getFETokenInfo<Decl>() == D) { 72 // Normal case, no multiple decls in different namespaces. 73 II->setFETokenInfo(D->getNext()); 74 } else { 75 // Scan ahead. There are only three namespaces in C, so this loop can 76 // never execute more than 3 times. 77 ScopedDecl *SomeDecl = II->getFETokenInfo<ScopedDecl>(); 78 while (SomeDecl->getNext() != D) { 79 SomeDecl = SomeDecl->getNext(); 80 assert(SomeDecl && "Didn't find this decl on its identifier's chain!"); 81 } 82 SomeDecl->setNext(D->getNext()); 83 } 84 85 // This will have to be revisited for C++: there we want to nest stuff in 86 // namespace decls etc. Even for C, we might want a top-level translation 87 // unit decl or something. 88 if (!CurFunctionDecl) 89 continue; 90 91 // Chain this decl to the containing function, it now owns the memory for 92 // the decl. 93 D->setNext(CurFunctionDecl->getDeclChain()); 94 CurFunctionDecl->setDeclChain(D); 95 } 96} 97 98/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 99/// return 0 if one not found. 100ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 101 // The third "scope" argument is 0 since we aren't enabling lazy built-in 102 // creation from this context. 103 Decl *IDecl = LookupDecl(Id, Decl::IDNS_Ordinary, 0, false); 104 105 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 106} 107 108/// LookupDecl - Look up the inner-most declaration in the specified 109/// namespace. 110Decl *Sema::LookupDecl(const IdentifierInfo *II, unsigned NSI, 111 Scope *S, bool enableLazyBuiltinCreation) { 112 if (II == 0) return 0; 113 Decl::IdentifierNamespace NS = (Decl::IdentifierNamespace)NSI; 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 for (ScopedDecl *D = II->getFETokenInfo<ScopedDecl>(); D; D = D->getNext()) 119 if (D->getIdentifierNamespace() == NS) 120 return D; 121 122 // If we didn't find a use of this identifier, and if the identifier 123 // corresponds to a compiler builtin, create the decl object for the builtin 124 // now, injecting it into translation unit scope, and return it. 125 if (NS == Decl::IDNS_Ordinary) { 126 if (enableLazyBuiltinCreation) { 127 // If this is a builtin on this (or all) targets, create the decl. 128 if (unsigned BuiltinID = II->getBuiltinID()) 129 return LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID, S); 130 } 131 if (getLangOptions().ObjC1) { 132 // @interface and @compatibility_alias introduce typedef-like names. 133 // Unlike typedef's, they can only be introduced at file-scope (and are 134 // therefore not scoped decls). They can, however, be shadowed by 135 // other names in IDNS_Ordinary. 136 ObjCInterfaceDeclsTy::iterator IDI = ObjCInterfaceDecls.find(II); 137 if (IDI != ObjCInterfaceDecls.end()) 138 return IDI->second; 139 ObjCAliasTy::iterator I = ObjCAliasDecls.find(II); 140 if (I != ObjCAliasDecls.end()) 141 return I->second->getClassInterface(); 142 } 143 } 144 return 0; 145} 146 147void Sema::InitBuiltinVaListType() 148{ 149 if (!Context.getBuiltinVaListType().isNull()) 150 return; 151 152 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 153 Decl *VaDecl = LookupDecl(VaIdent, Decl::IDNS_Ordinary, TUScope); 154 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 155 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 156} 157 158/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 159/// lazily create a decl for it. 160ScopedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 161 Scope *S) { 162 Builtin::ID BID = (Builtin::ID)bid; 163 164 if (BID == Builtin::BI__builtin_va_start || 165 BID == Builtin::BI__builtin_va_copy || 166 BID == Builtin::BI__builtin_va_end) 167 InitBuiltinVaListType(); 168 169 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 170 FunctionDecl *New = FunctionDecl::Create(Context, CurContext, 171 SourceLocation(), II, R, 172 FunctionDecl::Extern, false, 0); 173 174 // Find translation-unit scope to insert this function into. 175 if (Scope *FnS = S->getFnParent()) 176 S = FnS->getParent(); // Skip all scopes in a function at once. 177 while (S->getParent()) 178 S = S->getParent(); 179 S->AddDecl(New); 180 181 // Add this decl to the end of the identifier info. 182 if (ScopedDecl *LastDecl = II->getFETokenInfo<ScopedDecl>()) { 183 // Scan until we find the last (outermost) decl in the id chain. 184 while (LastDecl->getNext()) 185 LastDecl = LastDecl->getNext(); 186 // Insert before (outside) it. 187 LastDecl->setNext(New); 188 } else { 189 II->setFETokenInfo(New); 190 } 191 return New; 192} 193 194/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 195/// and scope as a previous declaration 'Old'. Figure out how to resolve this 196/// situation, merging decls or emitting diagnostics as appropriate. 197/// 198TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 199 // Verify the old decl was also a typedef. 200 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 201 if (!Old) { 202 Diag(New->getLocation(), diag::err_redefinition_different_kind, 203 New->getName()); 204 Diag(OldD->getLocation(), diag::err_previous_definition); 205 return New; 206 } 207 208 // Allow multiple definitions for ObjC built-in typedefs. 209 // FIXME: Verify the underlying types are equivalent! 210 if (getLangOptions().ObjC1 && isBuiltinObjCType(New)) 211 return Old; 212 213 // Redeclaration of a type is a constraint violation (6.7.2.3p1). 214 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 215 // *either* declaration is in a system header. The code below implements 216 // this adhoc compatibility rule. FIXME: The following code will not 217 // work properly when compiling ".i" files (containing preprocessed output). 218 SourceManager &SrcMgr = Context.getSourceManager(); 219 const FileEntry *OldDeclFile = SrcMgr.getFileEntryForLoc(Old->getLocation()); 220 const FileEntry *NewDeclFile = SrcMgr.getFileEntryForLoc(New->getLocation()); 221 HeaderSearch &HdrInfo = PP.getHeaderSearchInfo(); 222 DirectoryLookup::DirType OldDirType = HdrInfo.getFileDirFlavor(OldDeclFile); 223 DirectoryLookup::DirType NewDirType = HdrInfo.getFileDirFlavor(NewDeclFile); 224 225 // Allow reclarations in both SystemHeaderDir and ExternCSystemHeaderDir. 226 if ((OldDirType != DirectoryLookup::NormalHeaderDir || 227 NewDirType != DirectoryLookup::NormalHeaderDir) || 228 getLangOptions().Microsoft) 229 return New; 230 231 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 232 // TODO: This is totally simplistic. It should handle merging functions 233 // together etc, merging extern int X; int X; ... 234 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 235 Diag(Old->getLocation(), diag::err_previous_definition); 236 return New; 237} 238 239/// DeclhasAttr - returns true if decl Declaration already has the target attribute. 240static bool DeclHasAttr(const Decl *decl, const Attr *target) { 241 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 242 if (attr->getKind() == target->getKind()) 243 return true; 244 245 return false; 246} 247 248/// MergeAttributes - append attributes from the Old decl to the New one. 249static void MergeAttributes(Decl *New, Decl *Old) { 250 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 251 252// FIXME: fix this code to cleanup the Old attrs correctly 253 while (attr) { 254 tmp = attr; 255 attr = attr->getNext(); 256 257 if (!DeclHasAttr(New, tmp)) { 258 New->addAttr(tmp); 259 } else { 260 tmp->setNext(0); 261 delete(tmp); 262 } 263 } 264} 265 266/// MergeFunctionDecl - We just parsed a function 'New' from 267/// declarator D which has the same name and scope as a previous 268/// declaration 'Old'. Figure out how to resolve this situation, 269/// merging decls or emitting diagnostics as appropriate. 270/// 271FunctionDecl *Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 272 // Verify the old decl was also a function. 273 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 274 if (!Old) { 275 Diag(New->getLocation(), diag::err_redefinition_different_kind, 276 New->getName()); 277 Diag(OldD->getLocation(), diag::err_previous_definition); 278 return New; 279 } 280 281 MergeAttributes(New, Old); 282 283 QualType OldQType = Context.getCanonicalType(Old->getType()); 284 QualType NewQType = Context.getCanonicalType(New->getType()); 285 286 // C++ [dcl.fct]p3: 287 // All declarations for a function shall agree exactly in both the 288 // return type and the parameter-type-list. 289 if (getLangOptions().CPlusPlus && OldQType == NewQType) 290 return MergeCXXFunctionDecl(New, Old); 291 292 // C: Function types need to be compatible, not identical. This handles 293 // duplicate function decls like "void f(int); void f(enum X);" properly. 294 if (!getLangOptions().CPlusPlus && 295 Context.functionTypesAreCompatible(OldQType, NewQType)) { 296 return New; 297 } 298 299 // A function that has already been declared has been redeclared or defined 300 // with a different type- show appropriate diagnostic 301 diag::kind PrevDiag; 302 if (Old->getBody()) 303 PrevDiag = diag::err_previous_definition; 304 else if (Old->isImplicit()) 305 PrevDiag = diag::err_previous_implicit_declaration; 306 else 307 PrevDiag = diag::err_previous_declaration; 308 309 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 310 // TODO: This is totally simplistic. It should handle merging functions 311 // together etc, merging extern int X; int X; ... 312 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 313 Diag(Old->getLocation(), PrevDiag); 314 return New; 315} 316 317/// equivalentArrayTypes - Used to determine whether two array types are 318/// equivalent. 319/// We need to check this explicitly as an incomplete array definition is 320/// considered a VariableArrayType, so will not match a complete array 321/// definition that would be otherwise equivalent. 322static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 323 const ArrayType *NewAT = NewQType->getAsArrayType(); 324 const ArrayType *OldAT = OldQType->getAsArrayType(); 325 326 if (!NewAT || !OldAT) 327 return false; 328 329 // If either (or both) array types in incomplete we need to strip off the 330 // outer VariableArrayType. Once the outer VAT is removed the remaining 331 // types must be identical if the array types are to be considered 332 // equivalent. 333 // eg. int[][1] and int[1][1] become 334 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 335 // removing the outermost VAT gives 336 // CAT(1, int) and CAT(1, int) 337 // which are equal, therefore the array types are equivalent. 338 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 339 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 340 return false; 341 NewQType = NewAT->getElementType().getCanonicalType(); 342 OldQType = OldAT->getElementType().getCanonicalType(); 343 } 344 345 return NewQType == OldQType; 346} 347 348/// MergeVarDecl - We just parsed a variable 'New' which has the same name 349/// and scope as a previous declaration 'Old'. Figure out how to resolve this 350/// situation, merging decls or emitting diagnostics as appropriate. 351/// 352/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 353/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 354/// 355VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 356 // Verify the old decl was also a variable. 357 VarDecl *Old = dyn_cast<VarDecl>(OldD); 358 if (!Old) { 359 Diag(New->getLocation(), diag::err_redefinition_different_kind, 360 New->getName()); 361 Diag(OldD->getLocation(), diag::err_previous_definition); 362 return New; 363 } 364 365 MergeAttributes(New, Old); 366 367 // Verify the types match. 368 QualType OldCType = Context.getCanonicalType(Old->getType()); 369 QualType NewCType = Context.getCanonicalType(New->getType()); 370 if (OldCType != NewCType && !areEquivalentArrayTypes(NewCType, OldCType)) { 371 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 372 Diag(Old->getLocation(), diag::err_previous_definition); 373 return New; 374 } 375 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 376 if (New->getStorageClass() == VarDecl::Static && 377 (Old->getStorageClass() == VarDecl::None || 378 Old->getStorageClass() == VarDecl::Extern)) { 379 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 380 Diag(Old->getLocation(), diag::err_previous_definition); 381 return New; 382 } 383 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 384 if (New->getStorageClass() != VarDecl::Static && 385 Old->getStorageClass() == VarDecl::Static) { 386 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 387 Diag(Old->getLocation(), diag::err_previous_definition); 388 return New; 389 } 390 // We've verified the types match, now handle "tentative" definitions. 391 FileVarDecl *OldFSDecl = dyn_cast<FileVarDecl>(Old); 392 FileVarDecl *NewFSDecl = dyn_cast<FileVarDecl>(New); 393 394 if (OldFSDecl && NewFSDecl) { 395 // Handle C "tentative" external object definitions (C99 6.9.2). 396 bool OldIsTentative = false; 397 bool NewIsTentative = false; 398 399 if (!OldFSDecl->getInit() && 400 (OldFSDecl->getStorageClass() == VarDecl::None || 401 OldFSDecl->getStorageClass() == VarDecl::Static)) 402 OldIsTentative = true; 403 404 // FIXME: this check doesn't work (since the initializer hasn't been 405 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 406 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 407 // thrown out the old decl. 408 if (!NewFSDecl->getInit() && 409 (NewFSDecl->getStorageClass() == VarDecl::None || 410 NewFSDecl->getStorageClass() == VarDecl::Static)) 411 ; // change to NewIsTentative = true; once the code is moved. 412 413 if (NewIsTentative || OldIsTentative) 414 return New; 415 } 416 if (Old->getStorageClass() != VarDecl::Extern && 417 New->getStorageClass() != VarDecl::Extern) { 418 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 419 Diag(Old->getLocation(), diag::err_previous_definition); 420 } 421 return New; 422} 423 424/// CheckParmsForFunctionDef - Check that the parameters of the given 425/// function are appropriate for the definition of a function. This 426/// takes care of any checks that cannot be performed on the 427/// declaration itself, e.g., that the types of each of the function 428/// parameters are complete. 429bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 430 bool HasInvalidParm = false; 431 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 432 ParmVarDecl *Param = FD->getParamDecl(p); 433 434 // C99 6.7.5.3p4: the parameters in a parameter type list in a 435 // function declarator that is part of a function definition of 436 // that function shall not have incomplete type. 437 if (Param->getType()->isIncompleteType() && 438 !Param->isInvalidDecl()) { 439 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type, 440 Param->getType().getAsString()); 441 Param->setInvalidDecl(); 442 HasInvalidParm = true; 443 } 444 } 445 446 return HasInvalidParm; 447} 448 449/// CreateImplicitParameter - Creates an implicit function parameter 450/// in the scope S and with the given type. This routine is used, for 451/// example, to create the implicit "self" parameter in an Objective-C 452/// method. 453ParmVarDecl * 454Sema::CreateImplicitParameter(Scope *S, IdentifierInfo *Id, 455 SourceLocation IdLoc, QualType Type) { 456 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, IdLoc, Id, Type, 457 VarDecl::None, 0, 0); 458 if (Id) { 459 New->setNext(Id->getFETokenInfo<ScopedDecl>()); 460 Id->setFETokenInfo(New); 461 S->AddDecl(New); 462 } 463 464 return New; 465} 466 467/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 468/// no declarator (e.g. "struct foo;") is parsed. 469Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 470 // TODO: emit error on 'int;' or 'const enum foo;'. 471 // TODO: emit error on 'typedef int;' 472 // if (!DS.isMissingDeclaratorOk()) Diag(...); 473 474 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 475} 476 477bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 478 // Get the type before calling CheckSingleAssignmentConstraints(), since 479 // it can promote the expression. 480 QualType InitType = Init->getType(); 481 482 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 483 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 484 InitType, Init, "initializing"); 485} 486 487bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 488 QualType ElementType) { 489 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 490 if (CheckSingleInitializer(expr, ElementType)) 491 return true; // types weren't compatible. 492 493 if (savExpr != expr) // The type was promoted, update initializer list. 494 IList->setInit(slot, expr); 495 return false; 496} 497 498bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 499 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 500 // C99 6.7.8p14. We have an array of character type with unknown size 501 // being initialized to a string literal. 502 llvm::APSInt ConstVal(32); 503 ConstVal = strLiteral->getByteLength() + 1; 504 // Return a new array type (C99 6.7.8p22). 505 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 506 ArrayType::Normal, 0); 507 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 508 // C99 6.7.8p14. We have an array of character type with known size. 509 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 510 Diag(strLiteral->getSourceRange().getBegin(), 511 diag::warn_initializer_string_for_char_array_too_long, 512 strLiteral->getSourceRange()); 513 } else { 514 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 515 } 516 // Set type from "char *" to "constant array of char". 517 strLiteral->setType(DeclT); 518 // For now, we always return false (meaning success). 519 return false; 520} 521 522StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 523 const ArrayType *AT = DeclType->getAsArrayType(); 524 if (AT && AT->getElementType()->isCharType()) { 525 return dyn_cast<StringLiteral>(Init); 526 } 527 return 0; 528} 529 530// CheckInitializerListTypes - Checks the types of elements of an initializer 531// list. This function is recursive: it calls itself to initialize subelements 532// of aggregate types. Note that the topLevel parameter essentially refers to 533// whether this expression "owns" the initializer list passed in, or if this 534// initialization is taking elements out of a parent initializer. Each 535// call to this function adds zero or more to startIndex, reports any errors, 536// and returns true if it found any inconsistent types. 537bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 538 bool topLevel, unsigned& startIndex) { 539 bool hadError = false; 540 541 if (DeclType->isScalarType()) { 542 // The simplest case: initializing a single scalar 543 if (topLevel) { 544 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 545 IList->getSourceRange()); 546 } 547 if (startIndex < IList->getNumInits()) { 548 Expr* expr = IList->getInit(startIndex); 549 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 550 // FIXME: Should an error be reported here instead? 551 unsigned newIndex = 0; 552 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 553 } else { 554 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 555 } 556 ++startIndex; 557 } 558 // FIXME: Should an error be reported for empty initializer list + scalar? 559 } else if (DeclType->isVectorType()) { 560 if (startIndex < IList->getNumInits()) { 561 const VectorType *VT = DeclType->getAsVectorType(); 562 int maxElements = VT->getNumElements(); 563 QualType elementType = VT->getElementType(); 564 565 for (int i = 0; i < maxElements; ++i) { 566 // Don't attempt to go past the end of the init list 567 if (startIndex >= IList->getNumInits()) 568 break; 569 Expr* expr = IList->getInit(startIndex); 570 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 571 unsigned newIndex = 0; 572 hadError |= CheckInitializerListTypes(SubInitList, elementType, 573 true, newIndex); 574 ++startIndex; 575 } else { 576 hadError |= CheckInitializerListTypes(IList, elementType, 577 false, startIndex); 578 } 579 } 580 } 581 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 582 if (DeclType->isStructureType() || DeclType->isUnionType()) { 583 if (startIndex < IList->getNumInits() && !topLevel && 584 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 585 DeclType)) { 586 // We found a compatible struct; per the standard, this initializes the 587 // struct. (The C standard technically says that this only applies for 588 // initializers for declarations with automatic scope; however, this 589 // construct is unambiguous anyway because a struct cannot contain 590 // a type compatible with itself. We'll output an error when we check 591 // if the initializer is constant.) 592 // FIXME: Is a call to CheckSingleInitializer required here? 593 ++startIndex; 594 } else { 595 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 596 597 // If the record is invalid, some of it's members are invalid. To avoid 598 // confusion, we forgo checking the intializer for the entire record. 599 if (structDecl->isInvalidDecl()) 600 return true; 601 602 // If structDecl is a forward declaration, this loop won't do anything; 603 // That's okay, because an error should get printed out elsewhere. It 604 // might be worthwhile to skip over the rest of the initializer, though. 605 int numMembers = structDecl->getNumMembers() - 606 structDecl->hasFlexibleArrayMember(); 607 for (int i = 0; i < numMembers; i++) { 608 // Don't attempt to go past the end of the init list 609 if (startIndex >= IList->getNumInits()) 610 break; 611 FieldDecl * curField = structDecl->getMember(i); 612 if (!curField->getIdentifier()) { 613 // Don't initialize unnamed fields, e.g. "int : 20;" 614 continue; 615 } 616 QualType fieldType = curField->getType(); 617 Expr* expr = IList->getInit(startIndex); 618 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 619 unsigned newStart = 0; 620 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 621 true, newStart); 622 ++startIndex; 623 } else { 624 hadError |= CheckInitializerListTypes(IList, fieldType, 625 false, startIndex); 626 } 627 if (DeclType->isUnionType()) 628 break; 629 } 630 // FIXME: Implement flexible array initialization GCC extension (it's a 631 // really messy extension to implement, unfortunately...the necessary 632 // information isn't actually even here!) 633 } 634 } else if (DeclType->isArrayType()) { 635 // Check for the special-case of initializing an array with a string. 636 if (startIndex < IList->getNumInits()) { 637 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 638 DeclType)) { 639 CheckStringLiteralInit(lit, DeclType); 640 ++startIndex; 641 if (topLevel && startIndex < IList->getNumInits()) { 642 // We have leftover initializers; warn 643 Diag(IList->getInit(startIndex)->getLocStart(), 644 diag::err_excess_initializers_in_char_array_initializer, 645 IList->getInit(startIndex)->getSourceRange()); 646 } 647 return false; 648 } 649 } 650 int maxElements; 651 if (DeclType->isIncompleteArrayType()) { 652 // FIXME: use a proper constant 653 maxElements = 0x7FFFFFFF; 654 } else if (const VariableArrayType *VAT = 655 DeclType->getAsVariableArrayType()) { 656 // Check for VLAs; in standard C it would be possible to check this 657 // earlier, but I don't know where clang accepts VLAs (gcc accepts 658 // them in all sorts of strange places). 659 Diag(VAT->getSizeExpr()->getLocStart(), 660 diag::err_variable_object_no_init, 661 VAT->getSizeExpr()->getSourceRange()); 662 hadError = true; 663 maxElements = 0x7FFFFFFF; 664 } else { 665 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 666 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 667 } 668 QualType elementType = DeclType->getAsArrayType()->getElementType(); 669 int numElements = 0; 670 for (int i = 0; i < maxElements; ++i, ++numElements) { 671 // Don't attempt to go past the end of the init list 672 if (startIndex >= IList->getNumInits()) 673 break; 674 Expr* expr = IList->getInit(startIndex); 675 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 676 unsigned newIndex = 0; 677 hadError |= CheckInitializerListTypes(SubInitList, elementType, 678 true, newIndex); 679 ++startIndex; 680 } else { 681 hadError |= CheckInitializerListTypes(IList, elementType, 682 false, startIndex); 683 } 684 } 685 if (DeclType->isIncompleteArrayType()) { 686 // If this is an incomplete array type, the actual type needs to 687 // be calculated here 688 if (numElements == 0) { 689 // Sizing an array implicitly to zero is not allowed 690 // (It could in theory be allowed, but it doesn't really matter.) 691 Diag(IList->getLocStart(), 692 diag::err_at_least_one_initializer_needed_to_size_array); 693 hadError = true; 694 } else { 695 llvm::APSInt ConstVal(32); 696 ConstVal = numElements; 697 DeclType = Context.getConstantArrayType(elementType, ConstVal, 698 ArrayType::Normal, 0); 699 } 700 } 701 } else { 702 assert(0 && "Aggregate that isn't a function or array?!"); 703 } 704 } else { 705 // In C, all types are either scalars or aggregates, but 706 // additional handling is needed here for C++ (and possibly others?). 707 assert(0 && "Unsupported initializer type"); 708 } 709 710 // If this init list is a base list, we set the type; an initializer doesn't 711 // fundamentally have a type, but this makes the ASTs a bit easier to read 712 if (topLevel) 713 IList->setType(DeclType); 714 715 if (topLevel && startIndex < IList->getNumInits()) { 716 // We have leftover initializers; warn 717 Diag(IList->getInit(startIndex)->getLocStart(), 718 diag::warn_excess_initializers, 719 IList->getInit(startIndex)->getSourceRange()); 720 } 721 return hadError; 722} 723 724bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 725 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 726 // of unknown size ("[]") or an object type that is not a variable array type. 727 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 728 return Diag(VAT->getSizeExpr()->getLocStart(), 729 diag::err_variable_object_no_init, 730 VAT->getSizeExpr()->getSourceRange()); 731 732 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 733 if (!InitList) { 734 // FIXME: Handle wide strings 735 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 736 return CheckStringLiteralInit(strLiteral, DeclType); 737 738 if (DeclType->isArrayType()) 739 return Diag(Init->getLocStart(), 740 diag::err_array_init_list_required, 741 Init->getSourceRange()); 742 743 return CheckSingleInitializer(Init, DeclType); 744 } 745 unsigned newIndex = 0; 746 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 747} 748 749Sema::DeclTy * 750Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 751 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 752 IdentifierInfo *II = D.getIdentifier(); 753 754 // All of these full declarators require an identifier. If it doesn't have 755 // one, the ParsedFreeStandingDeclSpec action should be used. 756 if (II == 0) { 757 Diag(D.getDeclSpec().getSourceRange().getBegin(), 758 diag::err_declarator_need_ident, 759 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 760 return 0; 761 } 762 763 // The scope passed in may not be a decl scope. Zip up the scope tree until 764 // we find one that is. 765 while ((S->getFlags() & Scope::DeclScope) == 0) 766 S = S->getParent(); 767 768 // See if this is a redefinition of a variable in the same scope. 769 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 770 ScopedDecl *New; 771 bool InvalidDecl = false; 772 773 QualType R = GetTypeForDeclarator(D, S); 774 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 775 776 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 777 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 778 if (!NewTD) return 0; 779 780 // Handle attributes prior to checking for duplicates in MergeVarDecl 781 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 782 D.getAttributes()); 783 // Merge the decl with the existing one if appropriate. If the decl is 784 // in an outer scope, it isn't the same thing. 785 if (PrevDecl && S->isDeclScope(PrevDecl)) { 786 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 787 if (NewTD == 0) return 0; 788 } 789 New = NewTD; 790 if (S->getParent() == 0) { 791 // C99 6.7.7p2: If a typedef name specifies a variably modified type 792 // then it shall have block scope. 793 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 794 // FIXME: Diagnostic needs to be fixed. 795 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 796 InvalidDecl = true; 797 } 798 } 799 } else if (R.getTypePtr()->isFunctionType()) { 800 FunctionDecl::StorageClass SC = FunctionDecl::None; 801 switch (D.getDeclSpec().getStorageClassSpec()) { 802 default: assert(0 && "Unknown storage class!"); 803 case DeclSpec::SCS_auto: 804 case DeclSpec::SCS_register: 805 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 806 R.getAsString()); 807 InvalidDecl = true; 808 break; 809 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 810 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 811 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 812 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 813 } 814 815 bool isInline = D.getDeclSpec().isInlineSpecified(); 816 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 817 D.getIdentifierLoc(), 818 II, R, SC, isInline, 819 LastDeclarator); 820 // Handle attributes. 821 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 822 D.getAttributes()); 823 824 // Copy the parameter declarations from the declarator D to 825 // the function declaration NewFD, if they are available. 826 if (D.getNumTypeObjects() > 0 && 827 D.getTypeObject(0).Fun.hasPrototype) { 828 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 829 830 // Create Decl objects for each parameter, adding them to the 831 // FunctionDecl. 832 llvm::SmallVector<ParmVarDecl*, 16> Params; 833 834 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 835 // function that takes no arguments, not a function that takes a 836 // single void argument. FIXME: Is this really the right place 837 // to check for this? C++ says that the parameter list (void) is 838 // the same as an empty parameter list, whereas the parameter 839 // list (T) (with T typedef'd to void) is not. For C++, this 840 // should be handled in the parser. Check C89 and C99 standards 841 // to see what the correct behavior is. 842 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 843 FTI.ArgInfo[0].Param && 844 !((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 845 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 846 // empty arg list, don't push any params. 847 } else { 848 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 849 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 850 } 851 852 NewFD->setParams(&Params[0], Params.size()); 853 } 854 855 // Merge the decl with the existing one if appropriate. Since C functions 856 // are in a flat namespace, make sure we consider decls in outer scopes. 857 if (PrevDecl) { 858 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 859 if (NewFD == 0) return 0; 860 } 861 New = NewFD; 862 863 // In C++, check default arguments now that we have merged decls. 864 if (getLangOptions().CPlusPlus) 865 CheckCXXDefaultArguments(NewFD); 866 } else { 867 if (R.getTypePtr()->isObjCInterfaceType()) { 868 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 869 D.getIdentifier()->getName()); 870 InvalidDecl = true; 871 } 872 873 VarDecl *NewVD; 874 VarDecl::StorageClass SC; 875 switch (D.getDeclSpec().getStorageClassSpec()) { 876 default: assert(0 && "Unknown storage class!"); 877 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 878 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 879 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 880 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 881 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 882 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 883 } 884 if (S->getParent() == 0) { 885 // C99 6.9p2: The storage-class specifiers auto and register shall not 886 // appear in the declaration specifiers in an external declaration. 887 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 888 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 889 R.getAsString()); 890 InvalidDecl = true; 891 } 892 NewVD = FileVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 893 II, R, SC, 894 LastDeclarator); 895 } else { 896 NewVD = BlockVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 897 II, R, SC, 898 LastDeclarator); 899 } 900 // Handle attributes prior to checking for duplicates in MergeVarDecl 901 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 902 D.getAttributes()); 903 904 // Emit an error if an address space was applied to decl with local storage. 905 // This includes arrays of objects with address space qualifiers, but not 906 // automatic variables that point to other address spaces. 907 // ISO/IEC TR 18037 S5.1.2 908 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 909 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 910 InvalidDecl = true; 911 } 912 // Merge the decl with the existing one if appropriate. If the decl is 913 // in an outer scope, it isn't the same thing. 914 if (PrevDecl && S->isDeclScope(PrevDecl)) { 915 NewVD = MergeVarDecl(NewVD, PrevDecl); 916 if (NewVD == 0) return 0; 917 } 918 New = NewVD; 919 } 920 921 // If this has an identifier, add it to the scope stack. 922 if (II) { 923 New->setNext(II->getFETokenInfo<ScopedDecl>()); 924 II->setFETokenInfo(New); 925 S->AddDecl(New); 926 } 927 // If any semantic error occurred, mark the decl as invalid. 928 if (D.getInvalidType() || InvalidDecl) 929 New->setInvalidDecl(); 930 931 return New; 932} 933 934bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 935 SourceLocation loc; 936 // FIXME: Remove the isReference check and handle assignment to a reference. 937 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 938 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 939 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 940 return true; 941 } 942 return false; 943} 944 945void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 946 Decl *RealDecl = static_cast<Decl *>(dcl); 947 Expr *Init = static_cast<Expr *>(init); 948 assert(Init && "missing initializer"); 949 950 // If there is no declaration, there was an error parsing it. Just ignore 951 // the initializer. 952 if (RealDecl == 0) { 953 delete Init; 954 return; 955 } 956 957 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 958 if (!VDecl) { 959 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 960 diag::err_illegal_initializer); 961 RealDecl->setInvalidDecl(); 962 return; 963 } 964 // Get the decls type and save a reference for later, since 965 // CheckInitializerTypes may change it. 966 QualType DclT = VDecl->getType(), SavT = DclT; 967 if (BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(VDecl)) { 968 VarDecl::StorageClass SC = BVD->getStorageClass(); 969 if (SC == VarDecl::Extern) { // C99 6.7.8p5 970 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 971 BVD->setInvalidDecl(); 972 } else if (!BVD->isInvalidDecl()) { 973 if (CheckInitializerTypes(Init, DclT)) 974 BVD->setInvalidDecl(); 975 if (SC == VarDecl::Static) // C99 6.7.8p4. 976 CheckForConstantInitializer(Init, DclT); 977 } 978 } else if (FileVarDecl *FVD = dyn_cast<FileVarDecl>(VDecl)) { 979 if (FVD->getStorageClass() == VarDecl::Extern) 980 Diag(VDecl->getLocation(), diag::warn_extern_init); 981 if (!FVD->isInvalidDecl()) 982 if (CheckInitializerTypes(Init, DclT)) 983 FVD->setInvalidDecl(); 984 985 // C99 6.7.8p4. All file scoped initializers need to be constant. 986 CheckForConstantInitializer(Init, DclT); 987 } 988 // If the type changed, it means we had an incomplete type that was 989 // completed by the initializer. For example: 990 // int ary[] = { 1, 3, 5 }; 991 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 992 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 993 VDecl->setType(DclT); 994 Init->setType(DclT); 995 } 996 997 // Attach the initializer to the decl. 998 VDecl->setInit(Init); 999 return; 1000} 1001 1002/// The declarators are chained together backwards, reverse the list. 1003Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 1004 // Often we have single declarators, handle them quickly. 1005 Decl *GroupDecl = static_cast<Decl*>(group); 1006 if (GroupDecl == 0) 1007 return 0; 1008 1009 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 1010 ScopedDecl *NewGroup = 0; 1011 if (Group->getNextDeclarator() == 0) 1012 NewGroup = Group; 1013 else { // reverse the list. 1014 while (Group) { 1015 ScopedDecl *Next = Group->getNextDeclarator(); 1016 Group->setNextDeclarator(NewGroup); 1017 NewGroup = Group; 1018 Group = Next; 1019 } 1020 } 1021 // Perform semantic analysis that depends on having fully processed both 1022 // the declarator and initializer. 1023 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 1024 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 1025 if (!IDecl) 1026 continue; 1027 FileVarDecl *FVD = dyn_cast<FileVarDecl>(IDecl); 1028 BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(IDecl); 1029 QualType T = IDecl->getType(); 1030 1031 // C99 6.7.5.2p2: If an identifier is declared to be an object with 1032 // static storage duration, it shall not have a variable length array. 1033 if ((FVD || BVD) && IDecl->getStorageClass() == VarDecl::Static) { 1034 if (T->getAsVariableArrayType()) { 1035 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 1036 IDecl->setInvalidDecl(); 1037 } 1038 } 1039 // Block scope. C99 6.7p7: If an identifier for an object is declared with 1040 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 1041 if (BVD && IDecl->getStorageClass() != VarDecl::Extern) { 1042 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1043 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1044 T.getAsString()); 1045 IDecl->setInvalidDecl(); 1046 } 1047 } 1048 // File scope. C99 6.9.2p2: A declaration of an identifier for and 1049 // object that has file scope without an initializer, and without a 1050 // storage-class specifier or with the storage-class specifier "static", 1051 // constitutes a tentative definition. Note: A tentative definition with 1052 // external linkage is valid (C99 6.2.2p5). 1053 if (FVD && !FVD->getInit() && (FVD->getStorageClass() == VarDecl::Static || 1054 FVD->getStorageClass() == VarDecl::None)) { 1055 if (T->isIncompleteArrayType()) { 1056 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 1057 // array to be completed. Don't issue a diagnostic. 1058 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 1059 // C99 6.9.2p3: If the declaration of an identifier for an object is 1060 // a tentative definition and has internal linkage (C99 6.2.2p3), the 1061 // declared type shall not be an incomplete type. 1062 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1063 T.getAsString()); 1064 IDecl->setInvalidDecl(); 1065 } 1066 } 1067 } 1068 return NewGroup; 1069} 1070 1071/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 1072/// to introduce parameters into function prototype scope. 1073Sema::DeclTy * 1074Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 1075 DeclSpec &DS = D.getDeclSpec(); 1076 1077 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 1078 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1079 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 1080 Diag(DS.getStorageClassSpecLoc(), 1081 diag::err_invalid_storage_class_in_func_decl); 1082 DS.ClearStorageClassSpecs(); 1083 } 1084 if (DS.isThreadSpecified()) { 1085 Diag(DS.getThreadSpecLoc(), 1086 diag::err_invalid_storage_class_in_func_decl); 1087 DS.ClearStorageClassSpecs(); 1088 } 1089 1090 1091 // In this context, we *do not* check D.getInvalidType(). If the declarator 1092 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 1093 // though it will not reflect the user specified type. 1094 QualType parmDeclType = GetTypeForDeclarator(D, S); 1095 1096 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 1097 1098 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 1099 // Can this happen for params? We already checked that they don't conflict 1100 // among each other. Here they can only shadow globals, which is ok. 1101 IdentifierInfo *II = D.getIdentifier(); 1102 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 1103 if (S->isDeclScope(PrevDecl)) { 1104 Diag(D.getIdentifierLoc(), diag::err_param_redefinition, 1105 dyn_cast<NamedDecl>(PrevDecl)->getName()); 1106 1107 // Recover by removing the name 1108 II = 0; 1109 D.SetIdentifier(0, D.getIdentifierLoc()); 1110 } 1111 } 1112 1113 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 1114 // Doing the promotion here has a win and a loss. The win is the type for 1115 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 1116 // code generator). The loss is the orginal type isn't preserved. For example: 1117 // 1118 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1119 // int blockvardecl[5]; 1120 // sizeof(parmvardecl); // size == 4 1121 // sizeof(blockvardecl); // size == 20 1122 // } 1123 // 1124 // For expressions, all implicit conversions are captured using the 1125 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1126 // 1127 // FIXME: If a source translation tool needs to see the original type, then 1128 // we need to consider storing both types (in ParmVarDecl)... 1129 // 1130 if (parmDeclType->isArrayType()) { 1131 // int x[restrict 4] -> int *restrict 1132 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1133 } else if (parmDeclType->isFunctionType()) 1134 parmDeclType = Context.getPointerType(parmDeclType); 1135 1136 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 1137 D.getIdentifierLoc(), II, 1138 parmDeclType, VarDecl::None, 1139 0, 0); 1140 1141 if (D.getInvalidType()) 1142 New->setInvalidDecl(); 1143 1144 if (II) { 1145 New->setNext(II->getFETokenInfo<ScopedDecl>()); 1146 II->setFETokenInfo(New); 1147 S->AddDecl(New); 1148 } 1149 1150 HandleDeclAttributes(New, D.getAttributes(), 0); 1151 return New; 1152 1153} 1154 1155Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1156 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1157 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1158 "Not a function declarator!"); 1159 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1160 1161 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1162 // for a K&R function. 1163 if (!FTI.hasPrototype) { 1164 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1165 if (FTI.ArgInfo[i].Param == 0) { 1166 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1167 FTI.ArgInfo[i].Ident->getName()); 1168 // Implicitly declare the argument as type 'int' for lack of a better 1169 // type. 1170 DeclSpec DS; 1171 const char* PrevSpec; // unused 1172 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 1173 PrevSpec); 1174 Declarator ParamD(DS, Declarator::KNRTypeListContext); 1175 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 1176 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 1177 } 1178 } 1179 1180 // Since this is a function definition, act as though we have information 1181 // about the arguments. 1182 if (FTI.NumArgs) 1183 FTI.hasPrototype = true; 1184 } else { 1185 // FIXME: Diagnose arguments without names in C. 1186 } 1187 1188 Scope *GlobalScope = FnBodyScope->getParent(); 1189 1190 // See if this is a redefinition. 1191 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1192 GlobalScope); 1193 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1194 if (FD->getBody()) { 1195 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1196 D.getIdentifier()->getName()); 1197 Diag(FD->getLocation(), diag::err_previous_definition); 1198 } 1199 } 1200 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1201 FunctionDecl *FD = cast<FunctionDecl>(decl); 1202 CurFunctionDecl = FD; 1203 PushDeclContext(FD); 1204 1205 // Check the validity of our function parameters 1206 CheckParmsForFunctionDef(FD); 1207 1208 // Introduce our parameters into the function scope 1209 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1210 ParmVarDecl *Param = FD->getParamDecl(p); 1211 // If this has an identifier, add it to the scope stack. 1212 if (IdentifierInfo *II = Param->getIdentifier()) { 1213 Param->setNext(II->getFETokenInfo<ScopedDecl>()); 1214 II->setFETokenInfo(Param); 1215 FnBodyScope->AddDecl(Param); 1216 } 1217 } 1218 1219 return FD; 1220} 1221 1222Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1223 Decl *dcl = static_cast<Decl *>(D); 1224 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1225 FD->setBody((Stmt*)Body); 1226 assert(FD == CurFunctionDecl && "Function parsing confused"); 1227 CurFunctionDecl = 0; 1228 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1229 MD->setBody((Stmt*)Body); 1230 CurMethodDecl = 0; 1231 } 1232 PopDeclContext(); 1233 // Verify and clean out per-function state. 1234 1235 // Check goto/label use. 1236 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1237 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1238 // Verify that we have no forward references left. If so, there was a goto 1239 // or address of a label taken, but no definition of it. Label fwd 1240 // definitions are indicated with a null substmt. 1241 if (I->second->getSubStmt() == 0) { 1242 LabelStmt *L = I->second; 1243 // Emit error. 1244 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1245 1246 // At this point, we have gotos that use the bogus label. Stitch it into 1247 // the function body so that they aren't leaked and that the AST is well 1248 // formed. 1249 if (Body) { 1250 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1251 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1252 } else { 1253 // The whole function wasn't parsed correctly, just delete this. 1254 delete L; 1255 } 1256 } 1257 } 1258 LabelMap.clear(); 1259 1260 return D; 1261} 1262 1263/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1264/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1265ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1266 IdentifierInfo &II, Scope *S) { 1267 if (getLangOptions().C99) // Extension in C99. 1268 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1269 else // Legal in C90, but warn about it. 1270 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1271 1272 // FIXME: handle stuff like: 1273 // void foo() { extern float X(); } 1274 // void bar() { X(); } <-- implicit decl for X in another scope. 1275 1276 // Set a Declarator for the implicit definition: int foo(); 1277 const char *Dummy; 1278 DeclSpec DS; 1279 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1280 Error = Error; // Silence warning. 1281 assert(!Error && "Error setting up implicit decl!"); 1282 Declarator D(DS, Declarator::BlockContext); 1283 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1284 D.SetIdentifier(&II, Loc); 1285 1286 // Find translation-unit scope to insert this function into. 1287 if (Scope *FnS = S->getFnParent()) 1288 S = FnS->getParent(); // Skip all scopes in a function at once. 1289 while (S->getParent()) 1290 S = S->getParent(); 1291 1292 FunctionDecl *FD = 1293 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1294 FD->setImplicit(); 1295 return FD; 1296} 1297 1298 1299TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1300 ScopedDecl *LastDeclarator) { 1301 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1302 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1303 1304 // Scope manipulation handled by caller. 1305 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1306 D.getIdentifierLoc(), 1307 D.getIdentifier(), 1308 T, LastDeclarator); 1309 if (D.getInvalidType()) 1310 NewTD->setInvalidDecl(); 1311 return NewTD; 1312} 1313 1314/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1315/// former case, Name will be non-null. In the later case, Name will be null. 1316/// TagType indicates what kind of tag this is. TK indicates whether this is a 1317/// reference/declaration/definition of a tag. 1318Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1319 SourceLocation KWLoc, IdentifierInfo *Name, 1320 SourceLocation NameLoc, AttributeList *Attr) { 1321 // If this is a use of an existing tag, it must have a name. 1322 assert((Name != 0 || TK == TK_Definition) && 1323 "Nameless record must be a definition!"); 1324 1325 Decl::Kind Kind; 1326 switch (TagType) { 1327 default: assert(0 && "Unknown tag type!"); 1328 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1329 case DeclSpec::TST_union: Kind = Decl::Union; break; 1330//case DeclSpec::TST_class: Kind = Decl::Class; break; 1331 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1332 } 1333 1334 // If this is a named struct, check to see if there was a previous forward 1335 // declaration or definition. 1336 if (TagDecl *PrevDecl = 1337 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1338 1339 // If this is a use of a previous tag, or if the tag is already declared in 1340 // the same scope (so that the definition/declaration completes or 1341 // rementions the tag), reuse the decl. 1342 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1343 // Make sure that this wasn't declared as an enum and now used as a struct 1344 // or something similar. 1345 if (PrevDecl->getKind() != Kind) { 1346 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1347 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1348 } 1349 1350 // If this is a use or a forward declaration, we're good. 1351 if (TK != TK_Definition) 1352 return PrevDecl; 1353 1354 // Diagnose attempts to redefine a tag. 1355 if (PrevDecl->isDefinition()) { 1356 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1357 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1358 // If this is a redefinition, recover by making this struct be 1359 // anonymous, which will make any later references get the previous 1360 // definition. 1361 Name = 0; 1362 } else { 1363 // Okay, this is definition of a previously declared or referenced tag. 1364 // Move the location of the decl to be the definition site. 1365 PrevDecl->setLocation(NameLoc); 1366 return PrevDecl; 1367 } 1368 } 1369 // If we get here, this is a definition of a new struct type in a nested 1370 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1371 // type. 1372 } 1373 1374 // If there is an identifier, use the location of the identifier as the 1375 // location of the decl, otherwise use the location of the struct/union 1376 // keyword. 1377 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1378 1379 // Otherwise, if this is the first time we've seen this tag, create the decl. 1380 TagDecl *New; 1381 switch (Kind) { 1382 default: assert(0 && "Unknown tag kind!"); 1383 case Decl::Enum: 1384 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1385 // enum X { A, B, C } D; D should chain to X. 1386 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1387 // If this is an undefined enum, warn. 1388 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1389 break; 1390 case Decl::Union: 1391 case Decl::Struct: 1392 case Decl::Class: 1393 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1394 // struct X { int A; } D; D should chain to X. 1395 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1396 break; 1397 } 1398 1399 // If this has an identifier, add it to the scope stack. 1400 if (Name) { 1401 // The scope passed in may not be a decl scope. Zip up the scope tree until 1402 // we find one that is. 1403 while ((S->getFlags() & Scope::DeclScope) == 0) 1404 S = S->getParent(); 1405 1406 // Add it to the decl chain. 1407 New->setNext(Name->getFETokenInfo<ScopedDecl>()); 1408 Name->setFETokenInfo(New); 1409 S->AddDecl(New); 1410 } 1411 1412 HandleDeclAttributes(New, Attr, 0); 1413 return New; 1414} 1415 1416/// ActOnField - Each field of a struct/union/class is passed into this in order 1417/// to create a FieldDecl object for it. 1418Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *tagDecl, 1419 SourceLocation DeclStart, 1420 Declarator &D, ExprTy *BitfieldWidth) { 1421 IdentifierInfo *II = D.getIdentifier(); 1422 Expr *BitWidth = (Expr*)BitfieldWidth; 1423 Decl *TagDecl = static_cast<Decl *>(tagDecl); 1424 SourceLocation Loc = DeclStart; 1425 if (II) Loc = D.getIdentifierLoc(); 1426 1427 // FIXME: Unnamed fields can be handled in various different ways, for 1428 // example, unnamed unions inject all members into the struct namespace! 1429 1430 1431 if (BitWidth) { 1432 // TODO: Validate. 1433 //printf("WARNING: BITFIELDS IGNORED!\n"); 1434 1435 // 6.7.2.1p3 1436 // 6.7.2.1p4 1437 1438 } else { 1439 // Not a bitfield. 1440 1441 // validate II. 1442 1443 } 1444 1445 QualType T = GetTypeForDeclarator(D, S); 1446 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1447 bool InvalidDecl = false; 1448 1449 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1450 // than a variably modified type. 1451 if (T->isVariablyModifiedType()) { 1452 // FIXME: This diagnostic needs work 1453 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1454 InvalidDecl = true; 1455 } 1456 // FIXME: Chain fielddecls together. 1457 FieldDecl *NewFD; 1458 1459 if (isa<RecordDecl>(TagDecl)) 1460 NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1461 else if (isa<ObjCInterfaceDecl>(TagDecl) || 1462 isa<ObjCImplementationDecl>(TagDecl) || 1463 isa<ObjCCategoryDecl>(TagDecl) || 1464 // FIXME: ivars are currently used to model properties, and 1465 // properties can appear within a protocol. 1466 // See corresponding FIXME in DeclObjC.h:ObjCPropertyDecl. 1467 isa<ObjCProtocolDecl>(TagDecl)) 1468 NewFD = ObjCIvarDecl::Create(Context, Loc, II, T); 1469 else 1470 assert(0 && "Sema::ActOnField(): Unknown TagDecl"); 1471 1472 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1473 D.getAttributes()); 1474 1475 if (D.getInvalidType() || InvalidDecl) 1476 NewFD->setInvalidDecl(); 1477 return NewFD; 1478} 1479 1480/// TranslateIvarVisibility - Translate visibility from a token ID to an 1481/// AST enum value. 1482static ObjCIvarDecl::AccessControl 1483TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1484 switch (ivarVisibility) { 1485 case tok::objc_private: return ObjCIvarDecl::Private; 1486 case tok::objc_public: return ObjCIvarDecl::Public; 1487 case tok::objc_protected: return ObjCIvarDecl::Protected; 1488 case tok::objc_package: return ObjCIvarDecl::Package; 1489 default: assert(false && "Unknown visitibility kind"); 1490 } 1491} 1492 1493void Sema::ActOnFields(Scope* S, 1494 SourceLocation RecLoc, DeclTy *RecDecl, 1495 DeclTy **Fields, unsigned NumFields, 1496 SourceLocation LBrac, SourceLocation RBrac, 1497 tok::ObjCKeywordKind *visibility) { 1498 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1499 assert(EnclosingDecl && "missing record or interface decl"); 1500 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1501 1502 if (Record && Record->isDefinition()) { 1503 // Diagnose code like: 1504 // struct S { struct S {} X; }; 1505 // We discover this when we complete the outer S. Reject and ignore the 1506 // outer S. 1507 Diag(Record->getLocation(), diag::err_nested_redefinition, 1508 Record->getKindName()); 1509 Diag(RecLoc, diag::err_previous_definition); 1510 Record->setInvalidDecl(); 1511 return; 1512 } 1513 // Verify that all the fields are okay. 1514 unsigned NumNamedMembers = 0; 1515 llvm::SmallVector<FieldDecl*, 32> RecFields; 1516 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1517 1518 for (unsigned i = 0; i != NumFields; ++i) { 1519 1520 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1521 assert(FD && "missing field decl"); 1522 1523 // Remember all fields. 1524 RecFields.push_back(FD); 1525 1526 // Get the type for the field. 1527 Type *FDTy = FD->getType().getTypePtr(); 1528 1529 // If we have visibility info, make sure the AST is set accordingly. 1530 if (visibility) 1531 cast<ObjCIvarDecl>(FD)->setAccessControl( 1532 TranslateIvarVisibility(visibility[i])); 1533 1534 // C99 6.7.2.1p2 - A field may not be a function type. 1535 if (FDTy->isFunctionType()) { 1536 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1537 FD->getName()); 1538 FD->setInvalidDecl(); 1539 EnclosingDecl->setInvalidDecl(); 1540 continue; 1541 } 1542 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1543 if (FDTy->isIncompleteType()) { 1544 if (!Record) { // Incomplete ivar type is always an error. 1545 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1546 FD->setInvalidDecl(); 1547 EnclosingDecl->setInvalidDecl(); 1548 continue; 1549 } 1550 if (i != NumFields-1 || // ... that the last member ... 1551 Record->getKind() != Decl::Struct || // ... of a structure ... 1552 !FDTy->isArrayType()) { //... may have incomplete array type. 1553 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1554 FD->setInvalidDecl(); 1555 EnclosingDecl->setInvalidDecl(); 1556 continue; 1557 } 1558 if (NumNamedMembers < 1) { //... must have more than named member ... 1559 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1560 FD->getName()); 1561 FD->setInvalidDecl(); 1562 EnclosingDecl->setInvalidDecl(); 1563 continue; 1564 } 1565 // Okay, we have a legal flexible array member at the end of the struct. 1566 if (Record) 1567 Record->setHasFlexibleArrayMember(true); 1568 } 1569 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1570 /// field of another structure or the element of an array. 1571 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1572 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1573 // If this is a member of a union, then entire union becomes "flexible". 1574 if (Record && Record->getKind() == Decl::Union) { 1575 Record->setHasFlexibleArrayMember(true); 1576 } else { 1577 // If this is a struct/class and this is not the last element, reject 1578 // it. Note that GCC supports variable sized arrays in the middle of 1579 // structures. 1580 if (i != NumFields-1) { 1581 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1582 FD->getName()); 1583 FD->setInvalidDecl(); 1584 EnclosingDecl->setInvalidDecl(); 1585 continue; 1586 } 1587 // We support flexible arrays at the end of structs in other structs 1588 // as an extension. 1589 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1590 FD->getName()); 1591 if (Record) 1592 Record->setHasFlexibleArrayMember(true); 1593 } 1594 } 1595 } 1596 /// A field cannot be an Objective-c object 1597 if (FDTy->isObjCInterfaceType()) { 1598 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1599 FD->getName()); 1600 FD->setInvalidDecl(); 1601 EnclosingDecl->setInvalidDecl(); 1602 continue; 1603 } 1604 // Keep track of the number of named members. 1605 if (IdentifierInfo *II = FD->getIdentifier()) { 1606 // Detect duplicate member names. 1607 if (!FieldIDs.insert(II)) { 1608 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1609 // Find the previous decl. 1610 SourceLocation PrevLoc; 1611 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1612 assert(i != e && "Didn't find previous def!"); 1613 if (RecFields[i]->getIdentifier() == II) { 1614 PrevLoc = RecFields[i]->getLocation(); 1615 break; 1616 } 1617 } 1618 Diag(PrevLoc, diag::err_previous_definition); 1619 FD->setInvalidDecl(); 1620 EnclosingDecl->setInvalidDecl(); 1621 continue; 1622 } 1623 ++NumNamedMembers; 1624 } 1625 } 1626 1627 // Okay, we successfully defined 'Record'. 1628 if (Record) { 1629 Record->defineBody(&RecFields[0], RecFields.size()); 1630 Consumer.HandleTagDeclDefinition(Record); 1631 } else { 1632 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1633 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1634 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1635 else if (ObjCImplementationDecl *IMPDecl = 1636 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1637 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1638 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1639 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1640 } 1641 } 1642} 1643 1644Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1645 DeclTy *lastEnumConst, 1646 SourceLocation IdLoc, IdentifierInfo *Id, 1647 SourceLocation EqualLoc, ExprTy *val) { 1648 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1649 EnumConstantDecl *LastEnumConst = 1650 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1651 Expr *Val = static_cast<Expr*>(val); 1652 1653 // The scope passed in may not be a decl scope. Zip up the scope tree until 1654 // we find one that is. 1655 while ((S->getFlags() & Scope::DeclScope) == 0) 1656 S = S->getParent(); 1657 1658 // Verify that there isn't already something declared with this name in this 1659 // scope. 1660 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1661 if (S->isDeclScope(PrevDecl)) { 1662 if (isa<EnumConstantDecl>(PrevDecl)) 1663 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1664 else 1665 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1666 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1667 delete Val; 1668 return 0; 1669 } 1670 } 1671 1672 llvm::APSInt EnumVal(32); 1673 QualType EltTy; 1674 if (Val) { 1675 // Make sure to promote the operand type to int. 1676 UsualUnaryConversions(Val); 1677 1678 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1679 SourceLocation ExpLoc; 1680 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1681 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1682 Id->getName()); 1683 delete Val; 1684 Val = 0; // Just forget about it. 1685 } else { 1686 EltTy = Val->getType(); 1687 } 1688 } 1689 1690 if (!Val) { 1691 if (LastEnumConst) { 1692 // Assign the last value + 1. 1693 EnumVal = LastEnumConst->getInitVal(); 1694 ++EnumVal; 1695 1696 // Check for overflow on increment. 1697 if (EnumVal < LastEnumConst->getInitVal()) 1698 Diag(IdLoc, diag::warn_enum_value_overflow); 1699 1700 EltTy = LastEnumConst->getType(); 1701 } else { 1702 // First value, set to zero. 1703 EltTy = Context.IntTy; 1704 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1705 } 1706 } 1707 1708 EnumConstantDecl *New = 1709 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1710 Val, EnumVal, 1711 LastEnumConst); 1712 1713 // Register this decl in the current scope stack. 1714 New->setNext(Id->getFETokenInfo<ScopedDecl>()); 1715 Id->setFETokenInfo(New); 1716 S->AddDecl(New); 1717 return New; 1718} 1719 1720void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1721 DeclTy **Elements, unsigned NumElements) { 1722 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1723 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1724 1725 // TODO: If the result value doesn't fit in an int, it must be a long or long 1726 // long value. ISO C does not support this, but GCC does as an extension, 1727 // emit a warning. 1728 unsigned IntWidth = Context.Target.getIntWidth(); 1729 1730 // Verify that all the values are okay, compute the size of the values, and 1731 // reverse the list. 1732 unsigned NumNegativeBits = 0; 1733 unsigned NumPositiveBits = 0; 1734 1735 // Keep track of whether all elements have type int. 1736 bool AllElementsInt = true; 1737 1738 EnumConstantDecl *EltList = 0; 1739 for (unsigned i = 0; i != NumElements; ++i) { 1740 EnumConstantDecl *ECD = 1741 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1742 if (!ECD) continue; // Already issued a diagnostic. 1743 1744 // If the enum value doesn't fit in an int, emit an extension warning. 1745 const llvm::APSInt &InitVal = ECD->getInitVal(); 1746 assert(InitVal.getBitWidth() >= IntWidth && 1747 "Should have promoted value to int"); 1748 if (InitVal.getBitWidth() > IntWidth) { 1749 llvm::APSInt V(InitVal); 1750 V.trunc(IntWidth); 1751 V.extend(InitVal.getBitWidth()); 1752 if (V != InitVal) 1753 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1754 InitVal.toString()); 1755 } 1756 1757 // Keep track of the size of positive and negative values. 1758 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1759 NumPositiveBits = std::max(NumPositiveBits, 1760 (unsigned)InitVal.getActiveBits()); 1761 else 1762 NumNegativeBits = std::max(NumNegativeBits, 1763 (unsigned)InitVal.getMinSignedBits()); 1764 1765 // Keep track of whether every enum element has type int (very commmon). 1766 if (AllElementsInt) 1767 AllElementsInt = ECD->getType() == Context.IntTy; 1768 1769 ECD->setNextDeclarator(EltList); 1770 EltList = ECD; 1771 } 1772 1773 // Figure out the type that should be used for this enum. 1774 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1775 QualType BestType; 1776 unsigned BestWidth; 1777 1778 if (NumNegativeBits) { 1779 // If there is a negative value, figure out the smallest integer type (of 1780 // int/long/longlong) that fits. 1781 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1782 BestType = Context.IntTy; 1783 BestWidth = IntWidth; 1784 } else { 1785 BestWidth = Context.Target.getLongWidth(); 1786 1787 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1788 BestType = Context.LongTy; 1789 else { 1790 BestWidth = Context.Target.getLongLongWidth(); 1791 1792 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1793 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1794 BestType = Context.LongLongTy; 1795 } 1796 } 1797 } else { 1798 // If there is no negative value, figure out which of uint, ulong, ulonglong 1799 // fits. 1800 if (NumPositiveBits <= IntWidth) { 1801 BestType = Context.UnsignedIntTy; 1802 BestWidth = IntWidth; 1803 } else if (NumPositiveBits <= 1804 (BestWidth = Context.Target.getLongWidth())) { 1805 BestType = Context.UnsignedLongTy; 1806 } else { 1807 BestWidth = Context.Target.getLongLongWidth(); 1808 assert(NumPositiveBits <= BestWidth && 1809 "How could an initializer get larger than ULL?"); 1810 BestType = Context.UnsignedLongLongTy; 1811 } 1812 } 1813 1814 // Loop over all of the enumerator constants, changing their types to match 1815 // the type of the enum if needed. 1816 for (unsigned i = 0; i != NumElements; ++i) { 1817 EnumConstantDecl *ECD = 1818 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1819 if (!ECD) continue; // Already issued a diagnostic. 1820 1821 // Standard C says the enumerators have int type, but we allow, as an 1822 // extension, the enumerators to be larger than int size. If each 1823 // enumerator value fits in an int, type it as an int, otherwise type it the 1824 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1825 // that X has type 'int', not 'unsigned'. 1826 if (ECD->getType() == Context.IntTy) { 1827 // Make sure the init value is signed. 1828 llvm::APSInt IV = ECD->getInitVal(); 1829 IV.setIsSigned(true); 1830 ECD->setInitVal(IV); 1831 continue; // Already int type. 1832 } 1833 1834 // Determine whether the value fits into an int. 1835 llvm::APSInt InitVal = ECD->getInitVal(); 1836 bool FitsInInt; 1837 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1838 FitsInInt = InitVal.getActiveBits() < IntWidth; 1839 else 1840 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1841 1842 // If it fits into an integer type, force it. Otherwise force it to match 1843 // the enum decl type. 1844 QualType NewTy; 1845 unsigned NewWidth; 1846 bool NewSign; 1847 if (FitsInInt) { 1848 NewTy = Context.IntTy; 1849 NewWidth = IntWidth; 1850 NewSign = true; 1851 } else if (ECD->getType() == BestType) { 1852 // Already the right type! 1853 continue; 1854 } else { 1855 NewTy = BestType; 1856 NewWidth = BestWidth; 1857 NewSign = BestType->isSignedIntegerType(); 1858 } 1859 1860 // Adjust the APSInt value. 1861 InitVal.extOrTrunc(NewWidth); 1862 InitVal.setIsSigned(NewSign); 1863 ECD->setInitVal(InitVal); 1864 1865 // Adjust the Expr initializer and type. 1866 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1867 ECD->setType(NewTy); 1868 } 1869 1870 Enum->defineElements(EltList, BestType); 1871 Consumer.HandleTagDeclDefinition(Enum); 1872} 1873 1874Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1875 ExprTy *expr) { 1876 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1877 1878 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1879} 1880 1881Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1882 SourceLocation LBrace, 1883 SourceLocation RBrace, 1884 const char *Lang, 1885 unsigned StrSize, 1886 DeclTy *D) { 1887 LinkageSpecDecl::LanguageIDs Language; 1888 Decl *dcl = static_cast<Decl *>(D); 1889 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1890 Language = LinkageSpecDecl::lang_c; 1891 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1892 Language = LinkageSpecDecl::lang_cxx; 1893 else { 1894 Diag(Loc, diag::err_bad_language); 1895 return 0; 1896 } 1897 1898 // FIXME: Add all the various semantics of linkage specifications 1899 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1900} 1901 1902void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1903 1904 switch (Attr->getKind()) { 1905 case AttributeList::AT_vector_size: 1906 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1907 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1908 if (!newType.isNull()) // install the new vector type into the decl 1909 vDecl->setType(newType); 1910 } 1911 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1912 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1913 Attr); 1914 if (!newType.isNull()) // install the new vector type into the decl 1915 tDecl->setUnderlyingType(newType); 1916 } 1917 break; 1918 case AttributeList::AT_ocu_vector_type: 1919 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1920 HandleOCUVectorTypeAttribute(tDecl, Attr); 1921 else 1922 Diag(Attr->getLoc(), 1923 diag::err_typecheck_ocu_vector_not_typedef); 1924 break; 1925 case AttributeList::AT_address_space: 1926 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1927 QualType newType = HandleAddressSpaceTypeAttribute( 1928 tDecl->getUnderlyingType(), 1929 Attr); 1930 tDecl->setUnderlyingType(newType); 1931 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1932 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1933 Attr); 1934 // install the new addr spaced type into the decl 1935 vDecl->setType(newType); 1936 } 1937 break; 1938 case AttributeList::AT_deprecated: 1939 HandleDeprecatedAttribute(New, Attr); 1940 break; 1941 case AttributeList::AT_visibility: 1942 HandleVisibilityAttribute(New, Attr); 1943 break; 1944 case AttributeList::AT_weak: 1945 HandleWeakAttribute(New, Attr); 1946 break; 1947 case AttributeList::AT_dllimport: 1948 HandleDLLImportAttribute(New, Attr); 1949 break; 1950 case AttributeList::AT_dllexport: 1951 HandleDLLExportAttribute(New, Attr); 1952 break; 1953 case AttributeList::AT_nothrow: 1954 HandleNothrowAttribute(New, Attr); 1955 break; 1956 case AttributeList::AT_stdcall: 1957 HandleStdCallAttribute(New, Attr); 1958 break; 1959 case AttributeList::AT_fastcall: 1960 HandleFastCallAttribute(New, Attr); 1961 break; 1962 case AttributeList::AT_aligned: 1963 HandleAlignedAttribute(New, Attr); 1964 break; 1965 case AttributeList::AT_packed: 1966 HandlePackedAttribute(New, Attr); 1967 break; 1968 case AttributeList::AT_annotate: 1969 HandleAnnotateAttribute(New, Attr); 1970 break; 1971 case AttributeList::AT_noreturn: 1972 HandleNoReturnAttribute(New, Attr); 1973 break; 1974 case AttributeList::AT_format: 1975 HandleFormatAttribute(New, Attr); 1976 break; 1977 default: 1978#if 0 1979 // TODO: when we have the full set of attributes, warn about unknown ones. 1980 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1981 Attr->getName()->getName()); 1982#endif 1983 break; 1984 } 1985} 1986 1987void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 1988 AttributeList *declarator_postfix) { 1989 while (declspec_prefix) { 1990 HandleDeclAttribute(New, declspec_prefix); 1991 declspec_prefix = declspec_prefix->getNext(); 1992 } 1993 while (declarator_postfix) { 1994 HandleDeclAttribute(New, declarator_postfix); 1995 declarator_postfix = declarator_postfix->getNext(); 1996 } 1997} 1998 1999void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 2000 AttributeList *rawAttr) { 2001 QualType curType = tDecl->getUnderlyingType(); 2002 // check the attribute arguments. 2003 if (rawAttr->getNumArgs() != 1) { 2004 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2005 std::string("1")); 2006 return; 2007 } 2008 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2009 llvm::APSInt vecSize(32); 2010 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2011 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2012 "ocu_vector_type", sizeExpr->getSourceRange()); 2013 return; 2014 } 2015 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 2016 // in conjunction with complex types (pointers, arrays, functions, etc.). 2017 Type *canonType = curType.getCanonicalType().getTypePtr(); 2018 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2019 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2020 curType.getCanonicalType().getAsString()); 2021 return; 2022 } 2023 // unlike gcc's vector_size attribute, the size is specified as the 2024 // number of elements, not the number of bytes. 2025 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 2026 2027 if (vectorSize == 0) { 2028 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2029 sizeExpr->getSourceRange()); 2030 return; 2031 } 2032 // Instantiate/Install the vector type, the number of elements is > 0. 2033 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 2034 // Remember this typedef decl, we will need it later for diagnostics. 2035 OCUVectorDecls.push_back(tDecl); 2036} 2037 2038QualType Sema::HandleVectorTypeAttribute(QualType curType, 2039 AttributeList *rawAttr) { 2040 // check the attribute arugments. 2041 if (rawAttr->getNumArgs() != 1) { 2042 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2043 std::string("1")); 2044 return QualType(); 2045 } 2046 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2047 llvm::APSInt vecSize(32); 2048 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 2049 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2050 "vector_size", sizeExpr->getSourceRange()); 2051 return QualType(); 2052 } 2053 // navigate to the base type - we need to provide for vector pointers, 2054 // vector arrays, and functions returning vectors. 2055 Type *canonType = curType.getCanonicalType().getTypePtr(); 2056 2057 if (canonType->isPointerType() || canonType->isArrayType() || 2058 canonType->isFunctionType()) { 2059 assert(0 && "HandleVector(): Complex type construction unimplemented"); 2060 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 2061 do { 2062 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 2063 canonType = PT->getPointeeType().getTypePtr(); 2064 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 2065 canonType = AT->getElementType().getTypePtr(); 2066 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 2067 canonType = FT->getResultType().getTypePtr(); 2068 } while (canonType->isPointerType() || canonType->isArrayType() || 2069 canonType->isFunctionType()); 2070 */ 2071 } 2072 // the base type must be integer or float. 2073 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 2074 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 2075 curType.getCanonicalType().getAsString()); 2076 return QualType(); 2077 } 2078 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 2079 // vecSize is specified in bytes - convert to bits. 2080 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 2081 2082 // the vector size needs to be an integral multiple of the type size. 2083 if (vectorSize % typeSize) { 2084 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 2085 sizeExpr->getSourceRange()); 2086 return QualType(); 2087 } 2088 if (vectorSize == 0) { 2089 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 2090 sizeExpr->getSourceRange()); 2091 return QualType(); 2092 } 2093 // Instantiate the vector type, the number of elements is > 0, and not 2094 // required to be a power of 2, unlike GCC. 2095 return Context.getVectorType(curType, vectorSize/typeSize); 2096} 2097 2098void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 2099 // check the attribute arguments. 2100 if (rawAttr->getNumArgs() > 0) { 2101 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2102 std::string("0")); 2103 return; 2104 } 2105 2106 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 2107 TD->addAttr(new PackedAttr); 2108 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 2109 // If the alignment is less than or equal to 8 bits, the packed attribute 2110 // has no effect. 2111 if (Context.getTypeAlign(FD->getType()) <= 8) 2112 Diag(rawAttr->getLoc(), 2113 diag::warn_attribute_ignored_for_field_of_type, 2114 rawAttr->getName()->getName(), FD->getType().getAsString()); 2115 else 2116 FD->addAttr(new PackedAttr); 2117 } else 2118 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2119 rawAttr->getName()->getName()); 2120} 2121 2122void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2123 // check the attribute arguments. 2124 if (rawAttr->getNumArgs() != 0) { 2125 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2126 std::string("0")); 2127 return; 2128 } 2129 2130 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2131 2132 if (!Fn) { 2133 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2134 "noreturn", "function"); 2135 return; 2136 } 2137 2138 d->addAttr(new NoReturnAttr()); 2139} 2140 2141void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2142 // check the attribute arguments. 2143 if (rawAttr->getNumArgs() != 0) { 2144 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2145 std::string("0")); 2146 return; 2147 } 2148 2149 d->addAttr(new DeprecatedAttr()); 2150} 2151 2152void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2153 // check the attribute arguments. 2154 if (rawAttr->getNumArgs() != 1) { 2155 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2156 std::string("1")); 2157 return; 2158 } 2159 2160 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2161 Arg = Arg->IgnoreParenCasts(); 2162 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2163 2164 if (Str == 0 || Str->isWide()) { 2165 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2166 "visibility", std::string("1")); 2167 return; 2168 } 2169 2170 const char *TypeStr = Str->getStrData(); 2171 unsigned TypeLen = Str->getByteLength(); 2172 llvm::GlobalValue::VisibilityTypes type; 2173 2174 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2175 type = llvm::GlobalValue::DefaultVisibility; 2176 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2177 type = llvm::GlobalValue::HiddenVisibility; 2178 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2179 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2180 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2181 type = llvm::GlobalValue::ProtectedVisibility; 2182 else { 2183 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2184 "visibility", TypeStr); 2185 return; 2186 } 2187 2188 d->addAttr(new VisibilityAttr(type)); 2189} 2190 2191void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2192 // check the attribute arguments. 2193 if (rawAttr->getNumArgs() != 0) { 2194 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2195 std::string("0")); 2196 return; 2197 } 2198 2199 d->addAttr(new WeakAttr()); 2200} 2201 2202void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2203 // check the attribute arguments. 2204 if (rawAttr->getNumArgs() != 0) { 2205 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2206 std::string("0")); 2207 return; 2208 } 2209 2210 d->addAttr(new DLLImportAttr()); 2211} 2212 2213void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2214 // check the attribute arguments. 2215 if (rawAttr->getNumArgs() != 0) { 2216 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2217 std::string("0")); 2218 return; 2219 } 2220 2221 d->addAttr(new DLLExportAttr()); 2222} 2223 2224void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2225 // check the attribute arguments. 2226 if (rawAttr->getNumArgs() != 0) { 2227 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2228 std::string("0")); 2229 return; 2230 } 2231 2232 d->addAttr(new StdCallAttr()); 2233} 2234 2235void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2236 // check the attribute arguments. 2237 if (rawAttr->getNumArgs() != 0) { 2238 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2239 std::string("0")); 2240 return; 2241 } 2242 2243 d->addAttr(new FastCallAttr()); 2244} 2245 2246void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2247 // check the attribute arguments. 2248 if (rawAttr->getNumArgs() != 0) { 2249 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2250 std::string("0")); 2251 return; 2252 } 2253 2254 d->addAttr(new NoThrowAttr()); 2255} 2256 2257static const FunctionTypeProto *getFunctionProto(Decl *d) { 2258 ValueDecl *decl = dyn_cast<ValueDecl>(d); 2259 if (!decl) return 0; 2260 2261 QualType Ty = decl->getType(); 2262 2263 if (Ty->isFunctionPointerType()) { 2264 const PointerType *PtrTy = Ty->getAsPointerType(); 2265 Ty = PtrTy->getPointeeType(); 2266 } 2267 2268 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2269 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2270 2271 return 0; 2272} 2273 2274 2275/// Handle __attribute__((format(type,idx,firstarg))) attributes 2276/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2277void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2278 2279 if (!rawAttr->getParameterName()) { 2280 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2281 "format", std::string("1")); 2282 return; 2283 } 2284 2285 if (rawAttr->getNumArgs() != 2) { 2286 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2287 std::string("3")); 2288 return; 2289 } 2290 2291 // GCC ignores the format attribute on K&R style function 2292 // prototypes, so we ignore it as well 2293 const FunctionTypeProto *proto = getFunctionProto(d); 2294 2295 if (!proto) { 2296 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2297 "format", "function"); 2298 return; 2299 } 2300 2301 // FIXME: in C++ the implicit 'this' function parameter also counts. 2302 // this is needed in order to be compatible with GCC 2303 // the index must start in 1 and the limit is numargs+1 2304 unsigned NumArgs = proto->getNumArgs(); 2305 unsigned FirstIdx = 1; 2306 2307 const char *Format = rawAttr->getParameterName()->getName(); 2308 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2309 2310 // Normalize the argument, __foo__ becomes foo. 2311 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2312 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2313 Format += 2; 2314 FormatLen -= 4; 2315 } 2316 2317 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2318 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2319 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2320 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2321 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2322 "format", rawAttr->getParameterName()->getName()); 2323 return; 2324 } 2325 2326 // checks for the 2nd argument 2327 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2328 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2329 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2330 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2331 "format", std::string("2"), IdxExpr->getSourceRange()); 2332 return; 2333 } 2334 2335 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2336 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2337 "format", std::string("2"), IdxExpr->getSourceRange()); 2338 return; 2339 } 2340 2341 // make sure the format string is really a string 2342 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2343 if (!Ty->isPointerType() || 2344 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2345 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2346 IdxExpr->getSourceRange()); 2347 return; 2348 } 2349 2350 2351 // check the 3rd argument 2352 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2353 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2354 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2355 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2356 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2357 return; 2358 } 2359 2360 // check if the function is variadic if the 3rd argument non-zero 2361 if (FirstArg != 0) { 2362 if (proto->isVariadic()) { 2363 ++NumArgs; // +1 for ... 2364 } else { 2365 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2366 return; 2367 } 2368 } 2369 2370 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2371 // the input is just the current time + the format string 2372 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2373 if (FirstArg != 0) { 2374 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2375 FirstArgExpr->getSourceRange()); 2376 return; 2377 } 2378 // if 0 it disables parameter checking (to use with e.g. va_list) 2379 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2380 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2381 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2382 return; 2383 } 2384 2385 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2386 Idx.getZExtValue(), FirstArg.getZExtValue())); 2387} 2388 2389void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2390 // check the attribute arguments. 2391 if (rawAttr->getNumArgs() != 1) { 2392 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2393 std::string("1")); 2394 return; 2395 } 2396 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2397 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2398 2399 // Make sure that there is a string literal as the annotation's single 2400 // argument. 2401 if (!SE) { 2402 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2403 return; 2404 } 2405 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2406 SE->getByteLength()))); 2407} 2408 2409void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2410{ 2411 // check the attribute arguments. 2412 if (rawAttr->getNumArgs() > 1) { 2413 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2414 std::string("1")); 2415 return; 2416 } 2417 2418 unsigned Align = 0; 2419 2420 if (rawAttr->getNumArgs() == 0) { 2421 // FIXME: This should be the target specific maximum alignment. 2422 // (For now we just use 128 bits which is the maximum on X86. 2423 Align = 128; 2424 return; 2425 } else { 2426 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2427 llvm::APSInt alignment(32); 2428 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2429 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2430 "aligned", alignmentExpr->getSourceRange()); 2431 return; 2432 } 2433 2434 Align = alignment.getZExtValue() * 8; 2435 } 2436 2437 d->addAttr(new AlignedAttr(Align)); 2438} 2439