SemaDecl.cpp revision 8bcfc5bef434d7052e28d0ce45182855659ebd3d
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' which has the same name 267/// and scope as a previous declaration 'Old'. Figure out how to resolve this 268/// situation, merging decls or emitting diagnostics as appropriate. 269/// 270FunctionDecl *Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 271 // Verify the old decl was also a function. 272 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 273 if (!Old) { 274 Diag(New->getLocation(), diag::err_redefinition_different_kind, 275 New->getName()); 276 Diag(OldD->getLocation(), diag::err_previous_definition); 277 return New; 278 } 279 280 MergeAttributes(New, Old); 281 282 283 QualType OldQType = Context.getCanonicalType(Old->getType()); 284 QualType NewQType = Context.getCanonicalType(New->getType()); 285 286 // Function types need to be compatible, not identical. This handles 287 // duplicate function decls like "void f(int); void f(enum X);" properly. 288 if (Context.functionTypesAreCompatible(OldQType, NewQType)) 289 return New; 290 291 // A function that has already been declared has been redeclared or defined 292 // with a different type- show appropriate diagnostic 293 diag::kind PrevDiag; 294 if (Old->getBody()) 295 PrevDiag = diag::err_previous_definition; 296 else if (Old->isImplicit()) 297 PrevDiag = diag::err_previous_implicit_declaration; 298 else 299 PrevDiag = diag::err_previous_declaration; 300 301 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 302 // TODO: This is totally simplistic. It should handle merging functions 303 // together etc, merging extern int X; int X; ... 304 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 305 Diag(Old->getLocation(), PrevDiag); 306 return New; 307} 308 309/// equivalentArrayTypes - Used to determine whether two array types are 310/// equivalent. 311/// We need to check this explicitly as an incomplete array definition is 312/// considered a VariableArrayType, so will not match a complete array 313/// definition that would be otherwise equivalent. 314static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 315 const ArrayType *NewAT = NewQType->getAsArrayType(); 316 const ArrayType *OldAT = OldQType->getAsArrayType(); 317 318 if (!NewAT || !OldAT) 319 return false; 320 321 // If either (or both) array types in incomplete we need to strip off the 322 // outer VariableArrayType. Once the outer VAT is removed the remaining 323 // types must be identical if the array types are to be considered 324 // equivalent. 325 // eg. int[][1] and int[1][1] become 326 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 327 // removing the outermost VAT gives 328 // CAT(1, int) and CAT(1, int) 329 // which are equal, therefore the array types are equivalent. 330 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 331 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 332 return false; 333 NewQType = NewAT->getElementType().getCanonicalType(); 334 OldQType = OldAT->getElementType().getCanonicalType(); 335 } 336 337 return NewQType == OldQType; 338} 339 340/// MergeVarDecl - We just parsed a variable 'New' which has the same name 341/// and scope as a previous declaration 'Old'. Figure out how to resolve this 342/// situation, merging decls or emitting diagnostics as appropriate. 343/// 344/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 345/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 346/// 347VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 348 // Verify the old decl was also a variable. 349 VarDecl *Old = dyn_cast<VarDecl>(OldD); 350 if (!Old) { 351 Diag(New->getLocation(), diag::err_redefinition_different_kind, 352 New->getName()); 353 Diag(OldD->getLocation(), diag::err_previous_definition); 354 return New; 355 } 356 357 MergeAttributes(New, Old); 358 359 // Verify the types match. 360 QualType OldCType = Context.getCanonicalType(Old->getType()); 361 QualType NewCType = Context.getCanonicalType(New->getType()); 362 if (OldCType != NewCType && !areEquivalentArrayTypes(NewCType, OldCType)) { 363 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 364 Diag(Old->getLocation(), diag::err_previous_definition); 365 return New; 366 } 367 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 368 if (New->getStorageClass() == VarDecl::Static && 369 (Old->getStorageClass() == VarDecl::None || 370 Old->getStorageClass() == VarDecl::Extern)) { 371 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 372 Diag(Old->getLocation(), diag::err_previous_definition); 373 return New; 374 } 375 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 376 if (New->getStorageClass() != VarDecl::Static && 377 Old->getStorageClass() == VarDecl::Static) { 378 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 379 Diag(Old->getLocation(), diag::err_previous_definition); 380 return New; 381 } 382 // We've verified the types match, now handle "tentative" definitions. 383 FileVarDecl *OldFSDecl = dyn_cast<FileVarDecl>(Old); 384 FileVarDecl *NewFSDecl = dyn_cast<FileVarDecl>(New); 385 386 if (OldFSDecl && NewFSDecl) { 387 // Handle C "tentative" external object definitions (C99 6.9.2). 388 bool OldIsTentative = false; 389 bool NewIsTentative = false; 390 391 if (!OldFSDecl->getInit() && 392 (OldFSDecl->getStorageClass() == VarDecl::None || 393 OldFSDecl->getStorageClass() == VarDecl::Static)) 394 OldIsTentative = true; 395 396 // FIXME: this check doesn't work (since the initializer hasn't been 397 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 398 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 399 // thrown out the old decl. 400 if (!NewFSDecl->getInit() && 401 (NewFSDecl->getStorageClass() == VarDecl::None || 402 NewFSDecl->getStorageClass() == VarDecl::Static)) 403 ; // change to NewIsTentative = true; once the code is moved. 404 405 if (NewIsTentative || OldIsTentative) 406 return New; 407 } 408 if (Old->getStorageClass() != VarDecl::Extern && 409 New->getStorageClass() != VarDecl::Extern) { 410 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 411 Diag(Old->getLocation(), diag::err_previous_definition); 412 } 413 return New; 414} 415 416/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 417/// no declarator (e.g. "struct foo;") is parsed. 418Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 419 // TODO: emit error on 'int;' or 'const enum foo;'. 420 // TODO: emit error on 'typedef int;' 421 // if (!DS.isMissingDeclaratorOk()) Diag(...); 422 423 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 424} 425 426bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 427 // Get the type before calling CheckSingleAssignmentConstraints(), since 428 // it can promote the expression. 429 QualType InitType = Init->getType(); 430 431 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 432 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 433 InitType, Init, "initializing"); 434} 435 436bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 437 QualType ElementType) { 438 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 439 if (CheckSingleInitializer(expr, ElementType)) 440 return true; // types weren't compatible. 441 442 if (savExpr != expr) // The type was promoted, update initializer list. 443 IList->setInit(slot, expr); 444 return false; 445} 446 447bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 448 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 449 // C99 6.7.8p14. We have an array of character type with unknown size 450 // being initialized to a string literal. 451 llvm::APSInt ConstVal(32); 452 ConstVal = strLiteral->getByteLength() + 1; 453 // Return a new array type (C99 6.7.8p22). 454 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 455 ArrayType::Normal, 0); 456 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 457 // C99 6.7.8p14. We have an array of character type with known size. 458 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 459 Diag(strLiteral->getSourceRange().getBegin(), 460 diag::warn_initializer_string_for_char_array_too_long, 461 strLiteral->getSourceRange()); 462 } else { 463 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 464 } 465 // Set type from "char *" to "constant array of char". 466 strLiteral->setType(DeclT); 467 // For now, we always return false (meaning success). 468 return false; 469} 470 471StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 472 const ArrayType *AT = DeclType->getAsArrayType(); 473 if (AT && AT->getElementType()->isCharType()) { 474 return dyn_cast<StringLiteral>(Init); 475 } 476 return 0; 477} 478 479// CheckInitializerListTypes - Checks the types of elements of an initializer 480// list. This function is recursive: it calls itself to initialize subelements 481// of aggregate types. Note that the topLevel parameter essentially refers to 482// whether this expression "owns" the initializer list passed in, or if this 483// initialization is taking elements out of a parent initializer. Each 484// call to this function adds zero or more to startIndex, reports any errors, 485// and returns true if it found any inconsistent types. 486bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 487 bool topLevel, unsigned& startIndex) { 488 bool hadError = false; 489 490 if (DeclType->isScalarType()) { 491 // The simplest case: initializing a single scalar 492 if (topLevel) { 493 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 494 IList->getSourceRange()); 495 } 496 if (startIndex < IList->getNumInits()) { 497 Expr* expr = IList->getInit(startIndex); 498 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 499 // FIXME: Should an error be reported here instead? 500 unsigned newIndex = 0; 501 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 502 } else { 503 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 504 } 505 ++startIndex; 506 } 507 // FIXME: Should an error be reported for empty initializer list + scalar? 508 } else if (DeclType->isVectorType()) { 509 if (startIndex < IList->getNumInits()) { 510 const VectorType *VT = DeclType->getAsVectorType(); 511 int maxElements = VT->getNumElements(); 512 QualType elementType = VT->getElementType(); 513 514 for (int i = 0; i < maxElements; ++i) { 515 // Don't attempt to go past the end of the init list 516 if (startIndex >= IList->getNumInits()) 517 break; 518 Expr* expr = IList->getInit(startIndex); 519 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 520 unsigned newIndex = 0; 521 hadError |= CheckInitializerListTypes(SubInitList, elementType, 522 true, newIndex); 523 ++startIndex; 524 } else { 525 hadError |= CheckInitializerListTypes(IList, elementType, 526 false, startIndex); 527 } 528 } 529 } 530 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 531 if (DeclType->isStructureType() || DeclType->isUnionType()) { 532 if (startIndex < IList->getNumInits() && !topLevel && 533 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 534 DeclType)) { 535 // We found a compatible struct; per the standard, this initializes the 536 // struct. (The C standard technically says that this only applies for 537 // initializers for declarations with automatic scope; however, this 538 // construct is unambiguous anyway because a struct cannot contain 539 // a type compatible with itself. We'll output an error when we check 540 // if the initializer is constant.) 541 // FIXME: Is a call to CheckSingleInitializer required here? 542 ++startIndex; 543 } else { 544 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 545 546 // If the record is invalid, some of it's members are invalid. To avoid 547 // confusion, we forgo checking the intializer for the entire record. 548 if (structDecl->isInvalidDecl()) 549 return true; 550 551 // If structDecl is a forward declaration, this loop won't do anything; 552 // That's okay, because an error should get printed out elsewhere. It 553 // might be worthwhile to skip over the rest of the initializer, though. 554 int numMembers = structDecl->getNumMembers() - 555 structDecl->hasFlexibleArrayMember(); 556 for (int i = 0; i < numMembers; i++) { 557 // Don't attempt to go past the end of the init list 558 if (startIndex >= IList->getNumInits()) 559 break; 560 FieldDecl * curField = structDecl->getMember(i); 561 if (!curField->getIdentifier()) { 562 // Don't initialize unnamed fields, e.g. "int : 20;" 563 continue; 564 } 565 QualType fieldType = curField->getType(); 566 Expr* expr = IList->getInit(startIndex); 567 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 568 unsigned newStart = 0; 569 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 570 true, newStart); 571 ++startIndex; 572 } else { 573 hadError |= CheckInitializerListTypes(IList, fieldType, 574 false, startIndex); 575 } 576 if (DeclType->isUnionType()) 577 break; 578 } 579 // FIXME: Implement flexible array initialization GCC extension (it's a 580 // really messy extension to implement, unfortunately...the necessary 581 // information isn't actually even here!) 582 } 583 } else if (DeclType->isArrayType()) { 584 // Check for the special-case of initializing an array with a string. 585 if (startIndex < IList->getNumInits()) { 586 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 587 DeclType)) { 588 CheckStringLiteralInit(lit, DeclType); 589 ++startIndex; 590 if (topLevel && startIndex < IList->getNumInits()) { 591 // We have leftover initializers; warn 592 Diag(IList->getInit(startIndex)->getLocStart(), 593 diag::err_excess_initializers_in_char_array_initializer, 594 IList->getInit(startIndex)->getSourceRange()); 595 } 596 return false; 597 } 598 } 599 int maxElements; 600 if (DeclType->isIncompleteArrayType()) { 601 // FIXME: use a proper constant 602 maxElements = 0x7FFFFFFF; 603 } else if (const VariableArrayType *VAT = 604 DeclType->getAsVariableArrayType()) { 605 // Check for VLAs; in standard C it would be possible to check this 606 // earlier, but I don't know where clang accepts VLAs (gcc accepts 607 // them in all sorts of strange places). 608 Diag(VAT->getSizeExpr()->getLocStart(), 609 diag::err_variable_object_no_init, 610 VAT->getSizeExpr()->getSourceRange()); 611 hadError = true; 612 maxElements = 0x7FFFFFFF; 613 } else { 614 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 615 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 616 } 617 QualType elementType = DeclType->getAsArrayType()->getElementType(); 618 int numElements = 0; 619 for (int i = 0; i < maxElements; ++i, ++numElements) { 620 // Don't attempt to go past the end of the init list 621 if (startIndex >= IList->getNumInits()) 622 break; 623 Expr* expr = IList->getInit(startIndex); 624 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 625 unsigned newIndex = 0; 626 hadError |= CheckInitializerListTypes(SubInitList, elementType, 627 true, newIndex); 628 ++startIndex; 629 } else { 630 hadError |= CheckInitializerListTypes(IList, elementType, 631 false, startIndex); 632 } 633 } 634 if (DeclType->isIncompleteArrayType()) { 635 // If this is an incomplete array type, the actual type needs to 636 // be calculated here 637 if (numElements == 0) { 638 // Sizing an array implicitly to zero is not allowed 639 // (It could in theory be allowed, but it doesn't really matter.) 640 Diag(IList->getLocStart(), 641 diag::err_at_least_one_initializer_needed_to_size_array); 642 hadError = true; 643 } else { 644 llvm::APSInt ConstVal(32); 645 ConstVal = numElements; 646 DeclType = Context.getConstantArrayType(elementType, ConstVal, 647 ArrayType::Normal, 0); 648 } 649 } 650 } else { 651 assert(0 && "Aggregate that isn't a function or array?!"); 652 } 653 } else { 654 // In C, all types are either scalars or aggregates, but 655 // additional handling is needed here for C++ (and possibly others?). 656 assert(0 && "Unsupported initializer type"); 657 } 658 659 // If this init list is a base list, we set the type; an initializer doesn't 660 // fundamentally have a type, but this makes the ASTs a bit easier to read 661 if (topLevel) 662 IList->setType(DeclType); 663 664 if (topLevel && startIndex < IList->getNumInits()) { 665 // We have leftover initializers; warn 666 Diag(IList->getInit(startIndex)->getLocStart(), 667 diag::warn_excess_initializers, 668 IList->getInit(startIndex)->getSourceRange()); 669 } 670 return hadError; 671} 672 673bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 674 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 675 // of unknown size ("[]") or an object type that is not a variable array type. 676 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 677 return Diag(VAT->getSizeExpr()->getLocStart(), 678 diag::err_variable_object_no_init, 679 VAT->getSizeExpr()->getSourceRange()); 680 681 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 682 if (!InitList) { 683 // FIXME: Handle wide strings 684 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 685 return CheckStringLiteralInit(strLiteral, DeclType); 686 687 if (DeclType->isArrayType()) 688 return Diag(Init->getLocStart(), 689 diag::err_array_init_list_required, 690 Init->getSourceRange()); 691 692 return CheckSingleInitializer(Init, DeclType); 693 } 694 unsigned newIndex = 0; 695 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 696} 697 698Sema::DeclTy * 699Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 700 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 701 IdentifierInfo *II = D.getIdentifier(); 702 703 // All of these full declarators require an identifier. If it doesn't have 704 // one, the ParsedFreeStandingDeclSpec action should be used. 705 if (II == 0) { 706 Diag(D.getDeclSpec().getSourceRange().getBegin(), 707 diag::err_declarator_need_ident, 708 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 709 return 0; 710 } 711 712 // The scope passed in may not be a decl scope. Zip up the scope tree until 713 // we find one that is. 714 while ((S->getFlags() & Scope::DeclScope) == 0) 715 S = S->getParent(); 716 717 // See if this is a redefinition of a variable in the same scope. 718 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 719 ScopedDecl *New; 720 bool InvalidDecl = false; 721 722 QualType R = GetTypeForDeclarator(D, S); 723 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 724 725 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 726 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 727 if (!NewTD) return 0; 728 729 // Handle attributes prior to checking for duplicates in MergeVarDecl 730 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 731 D.getAttributes()); 732 // Merge the decl with the existing one if appropriate. If the decl is 733 // in an outer scope, it isn't the same thing. 734 if (PrevDecl && S->isDeclScope(PrevDecl)) { 735 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 736 if (NewTD == 0) return 0; 737 } 738 New = NewTD; 739 if (S->getParent() == 0) { 740 // C99 6.7.7p2: If a typedef name specifies a variably modified type 741 // then it shall have block scope. 742 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 743 // FIXME: Diagnostic needs to be fixed. 744 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 745 InvalidDecl = true; 746 } 747 } 748 } else if (R.getTypePtr()->isFunctionType()) { 749 FunctionDecl::StorageClass SC = FunctionDecl::None; 750 switch (D.getDeclSpec().getStorageClassSpec()) { 751 default: assert(0 && "Unknown storage class!"); 752 case DeclSpec::SCS_auto: 753 case DeclSpec::SCS_register: 754 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 755 R.getAsString()); 756 InvalidDecl = true; 757 break; 758 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 759 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 760 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 761 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 762 } 763 764 bool isInline = D.getDeclSpec().isInlineSpecified(); 765 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 766 D.getIdentifierLoc(), 767 II, R, SC, isInline, 768 LastDeclarator); 769 // Handle attributes. 770 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 771 D.getAttributes()); 772 773 // Merge the decl with the existing one if appropriate. Since C functions 774 // are in a flat namespace, make sure we consider decls in outer scopes. 775 if (PrevDecl) { 776 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 777 if (NewFD == 0) return 0; 778 } 779 New = NewFD; 780 } else { 781 if (R.getTypePtr()->isObjCInterfaceType()) { 782 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 783 D.getIdentifier()->getName()); 784 InvalidDecl = true; 785 } 786 787 VarDecl *NewVD; 788 VarDecl::StorageClass SC; 789 switch (D.getDeclSpec().getStorageClassSpec()) { 790 default: assert(0 && "Unknown storage class!"); 791 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 792 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 793 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 794 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 795 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 796 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 797 } 798 if (S->getParent() == 0) { 799 // C99 6.9p2: The storage-class specifiers auto and register shall not 800 // appear in the declaration specifiers in an external declaration. 801 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 802 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 803 R.getAsString()); 804 InvalidDecl = true; 805 } 806 NewVD = FileVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 807 II, R, SC, 808 LastDeclarator); 809 } else { 810 NewVD = BlockVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 811 II, R, SC, 812 LastDeclarator); 813 } 814 // Handle attributes prior to checking for duplicates in MergeVarDecl 815 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 816 D.getAttributes()); 817 818 // Emit an error if an address space was applied to decl with local storage. 819 // This includes arrays of objects with address space qualifiers, but not 820 // automatic variables that point to other address spaces. 821 // ISO/IEC TR 18037 S5.1.2 822 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 823 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 824 InvalidDecl = true; 825 } 826 // Merge the decl with the existing one if appropriate. If the decl is 827 // in an outer scope, it isn't the same thing. 828 if (PrevDecl && S->isDeclScope(PrevDecl)) { 829 NewVD = MergeVarDecl(NewVD, PrevDecl); 830 if (NewVD == 0) return 0; 831 } 832 New = NewVD; 833 } 834 835 // If this has an identifier, add it to the scope stack. 836 if (II) { 837 New->setNext(II->getFETokenInfo<ScopedDecl>()); 838 II->setFETokenInfo(New); 839 S->AddDecl(New); 840 } 841 // If any semantic error occurred, mark the decl as invalid. 842 if (D.getInvalidType() || InvalidDecl) 843 New->setInvalidDecl(); 844 845 return New; 846} 847 848bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 849 SourceLocation loc; 850 // FIXME: Remove the isReference check and handle assignment to a reference. 851 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 852 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 853 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 854 return true; 855 } 856 return false; 857} 858 859void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 860 Decl *RealDecl = static_cast<Decl *>(dcl); 861 Expr *Init = static_cast<Expr *>(init); 862 assert(Init && "missing initializer"); 863 864 // If there is no declaration, there was an error parsing it. Just ignore 865 // the initializer. 866 if (RealDecl == 0) { 867 delete Init; 868 return; 869 } 870 871 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 872 if (!VDecl) { 873 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 874 diag::err_illegal_initializer); 875 RealDecl->setInvalidDecl(); 876 return; 877 } 878 // Get the decls type and save a reference for later, since 879 // CheckInitializerTypes may change it. 880 QualType DclT = VDecl->getType(), SavT = DclT; 881 if (BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(VDecl)) { 882 VarDecl::StorageClass SC = BVD->getStorageClass(); 883 if (SC == VarDecl::Extern) { // C99 6.7.8p5 884 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 885 BVD->setInvalidDecl(); 886 } else if (!BVD->isInvalidDecl()) { 887 if (CheckInitializerTypes(Init, DclT)) 888 BVD->setInvalidDecl(); 889 if (SC == VarDecl::Static) // C99 6.7.8p4. 890 CheckForConstantInitializer(Init, DclT); 891 } 892 } else if (FileVarDecl *FVD = dyn_cast<FileVarDecl>(VDecl)) { 893 if (FVD->getStorageClass() == VarDecl::Extern) 894 Diag(VDecl->getLocation(), diag::warn_extern_init); 895 if (!FVD->isInvalidDecl()) 896 if (CheckInitializerTypes(Init, DclT)) 897 FVD->setInvalidDecl(); 898 899 // C99 6.7.8p4. All file scoped initializers need to be constant. 900 CheckForConstantInitializer(Init, DclT); 901 } 902 // If the type changed, it means we had an incomplete type that was 903 // completed by the initializer. For example: 904 // int ary[] = { 1, 3, 5 }; 905 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 906 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 907 VDecl->setType(DclT); 908 Init->setType(DclT); 909 } 910 911 // Attach the initializer to the decl. 912 VDecl->setInit(Init); 913 return; 914} 915 916/// The declarators are chained together backwards, reverse the list. 917Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 918 // Often we have single declarators, handle them quickly. 919 Decl *GroupDecl = static_cast<Decl*>(group); 920 if (GroupDecl == 0) 921 return 0; 922 923 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 924 ScopedDecl *NewGroup = 0; 925 if (Group->getNextDeclarator() == 0) 926 NewGroup = Group; 927 else { // reverse the list. 928 while (Group) { 929 ScopedDecl *Next = Group->getNextDeclarator(); 930 Group->setNextDeclarator(NewGroup); 931 NewGroup = Group; 932 Group = Next; 933 } 934 } 935 // Perform semantic analysis that depends on having fully processed both 936 // the declarator and initializer. 937 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 938 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 939 if (!IDecl) 940 continue; 941 FileVarDecl *FVD = dyn_cast<FileVarDecl>(IDecl); 942 BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(IDecl); 943 QualType T = IDecl->getType(); 944 945 // C99 6.7.5.2p2: If an identifier is declared to be an object with 946 // static storage duration, it shall not have a variable length array. 947 if ((FVD || BVD) && IDecl->getStorageClass() == VarDecl::Static) { 948 if (T->getAsVariableArrayType()) { 949 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 950 IDecl->setInvalidDecl(); 951 } 952 } 953 // Block scope. C99 6.7p7: If an identifier for an object is declared with 954 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 955 if (BVD && IDecl->getStorageClass() != VarDecl::Extern) { 956 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 957 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 958 T.getAsString()); 959 IDecl->setInvalidDecl(); 960 } 961 } 962 // File scope. C99 6.9.2p2: A declaration of an identifier for and 963 // object that has file scope without an initializer, and without a 964 // storage-class specifier or with the storage-class specifier "static", 965 // constitutes a tentative definition. Note: A tentative definition with 966 // external linkage is valid (C99 6.2.2p5). 967 if (FVD && !FVD->getInit() && (FVD->getStorageClass() == VarDecl::Static || 968 FVD->getStorageClass() == VarDecl::None)) { 969 if (T->isIncompleteArrayType()) { 970 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 971 // array to be completed. Don't issue a diagnostic. 972 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 973 // C99 6.9.2p3: If the declaration of an identifier for an object is 974 // a tentative definition and has internal linkage (C99 6.2.2p3), the 975 // declared type shall not be an incomplete type. 976 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 977 T.getAsString()); 978 IDecl->setInvalidDecl(); 979 } 980 } 981 } 982 return NewGroup; 983} 984 985// Called from Sema::ParseStartOfFunctionDef(). 986ParmVarDecl * 987Sema::ActOnParamDeclarator(struct DeclaratorChunk::ParamInfo &PI, 988 Scope *FnScope) { 989 IdentifierInfo *II = PI.Ident; 990 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 991 // Can this happen for params? We already checked that they don't conflict 992 // among each other. Here they can only shadow globals, which is ok. 993 if (/*Decl *PrevDecl = */LookupDecl(II, Decl::IDNS_Ordinary, FnScope)) { 994 995 } 996 997 // FIXME: Handle storage class (auto, register). No declarator? 998 // TODO: Chain to previous parameter with the prevdeclarator chain? 999 1000 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 1001 // Doing the promotion here has a win and a loss. The win is the type for 1002 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 1003 // code generator). The loss is the orginal type isn't preserved. For example: 1004 // 1005 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1006 // int blockvardecl[5]; 1007 // sizeof(parmvardecl); // size == 4 1008 // sizeof(blockvardecl); // size == 20 1009 // } 1010 // 1011 // For expressions, all implicit conversions are captured using the 1012 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1013 // 1014 // FIXME: If a source translation tool needs to see the original type, then 1015 // we need to consider storing both types (in ParmVarDecl)... 1016 // 1017 QualType parmDeclType = QualType::getFromOpaquePtr(PI.TypeInfo); 1018 if (parmDeclType->isArrayType()) { 1019 // int x[restrict 4] -> int *restrict 1020 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1021 } else if (parmDeclType->isFunctionType()) 1022 parmDeclType = Context.getPointerType(parmDeclType); 1023 1024 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, PI.IdentLoc, II, 1025 parmDeclType, 1026 VarDecl::None, 0); 1027 1028 if (PI.InvalidType) 1029 New->setInvalidDecl(); 1030 1031 // If this has an identifier, add it to the scope stack. 1032 if (II) { 1033 New->setNext(II->getFETokenInfo<ScopedDecl>()); 1034 II->setFETokenInfo(New); 1035 FnScope->AddDecl(New); 1036 } 1037 1038 HandleDeclAttributes(New, PI.AttrList, 0); 1039 return New; 1040} 1041 1042Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1043 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1044 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1045 "Not a function declarator!"); 1046 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1047 1048 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1049 // for a K&R function. 1050 if (!FTI.hasPrototype) { 1051 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1052 if (FTI.ArgInfo[i].TypeInfo == 0) { 1053 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1054 FTI.ArgInfo[i].Ident->getName()); 1055 // Implicitly declare the argument as type 'int' for lack of a better 1056 // type. 1057 FTI.ArgInfo[i].TypeInfo = Context.IntTy.getAsOpaquePtr(); 1058 } 1059 } 1060 1061 // Since this is a function definition, act as though we have information 1062 // about the arguments. 1063 if (FTI.NumArgs) 1064 FTI.hasPrototype = true; 1065 } else { 1066 // FIXME: Diagnose arguments without names in C. 1067 1068 } 1069 1070 Scope *GlobalScope = FnBodyScope->getParent(); 1071 1072 // See if this is a redefinition. 1073 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1074 GlobalScope); 1075 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1076 if (FD->getBody()) { 1077 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1078 D.getIdentifier()->getName()); 1079 Diag(FD->getLocation(), diag::err_previous_definition); 1080 } 1081 } 1082 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1083 FunctionDecl *FD = cast<FunctionDecl>(decl); 1084 CurFunctionDecl = FD; 1085 PushDeclContext(FD); 1086 1087 // Create Decl objects for each parameter, adding them to the FunctionDecl. 1088 llvm::SmallVector<ParmVarDecl*, 16> Params; 1089 1090 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 1091 // no arguments, not a function that takes a single void argument. 1092 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1093 !QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo).getCVRQualifiers() && 1094 QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo)->isVoidType()) { 1095 // empty arg list, don't push any params. 1096 } else { 1097 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1098 ParmVarDecl *parmDecl; 1099 1100 parmDecl = ActOnParamDeclarator(D.getTypeObject(0).Fun.ArgInfo[i], 1101 FnBodyScope); 1102 // C99 6.7.5.3p4: the parameters in a parameter type list in a function 1103 // declarator that is part of a function definition of that function 1104 // shall not have incomplete type. 1105 if (parmDecl->getType()->isIncompleteType() && 1106 !parmDecl->isInvalidDecl()) { 1107 Diag(parmDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1108 parmDecl->getType().getAsString()); 1109 parmDecl->setInvalidDecl(); 1110 } 1111 Params.push_back(parmDecl); 1112 } 1113 } 1114 1115 FD->setParams(&Params[0], Params.size()); 1116 1117 return FD; 1118} 1119 1120Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1121 Decl *dcl = static_cast<Decl *>(D); 1122 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1123 FD->setBody((Stmt*)Body); 1124 assert(FD == CurFunctionDecl && "Function parsing confused"); 1125 CurFunctionDecl = 0; 1126 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1127 MD->setBody((Stmt*)Body); 1128 CurMethodDecl = 0; 1129 } 1130 PopDeclContext(); 1131 // Verify and clean out per-function state. 1132 1133 // Check goto/label use. 1134 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1135 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1136 // Verify that we have no forward references left. If so, there was a goto 1137 // or address of a label taken, but no definition of it. Label fwd 1138 // definitions are indicated with a null substmt. 1139 if (I->second->getSubStmt() == 0) { 1140 LabelStmt *L = I->second; 1141 // Emit error. 1142 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1143 1144 // At this point, we have gotos that use the bogus label. Stitch it into 1145 // the function body so that they aren't leaked and that the AST is well 1146 // formed. 1147 if (Body) { 1148 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1149 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1150 } else { 1151 // The whole function wasn't parsed correctly, just delete this. 1152 delete L; 1153 } 1154 } 1155 } 1156 LabelMap.clear(); 1157 1158 return D; 1159} 1160 1161/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1162/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1163ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1164 IdentifierInfo &II, Scope *S) { 1165 if (getLangOptions().C99) // Extension in C99. 1166 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1167 else // Legal in C90, but warn about it. 1168 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1169 1170 // FIXME: handle stuff like: 1171 // void foo() { extern float X(); } 1172 // void bar() { X(); } <-- implicit decl for X in another scope. 1173 1174 // Set a Declarator for the implicit definition: int foo(); 1175 const char *Dummy; 1176 DeclSpec DS; 1177 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1178 Error = Error; // Silence warning. 1179 assert(!Error && "Error setting up implicit decl!"); 1180 Declarator D(DS, Declarator::BlockContext); 1181 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1182 D.SetIdentifier(&II, Loc); 1183 1184 // Find translation-unit scope to insert this function into. 1185 if (Scope *FnS = S->getFnParent()) 1186 S = FnS->getParent(); // Skip all scopes in a function at once. 1187 while (S->getParent()) 1188 S = S->getParent(); 1189 1190 FunctionDecl *FD = 1191 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1192 FD->setImplicit(); 1193 return FD; 1194} 1195 1196 1197TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1198 ScopedDecl *LastDeclarator) { 1199 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1200 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1201 1202 // Scope manipulation handled by caller. 1203 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1204 D.getIdentifierLoc(), 1205 D.getIdentifier(), 1206 T, LastDeclarator); 1207 if (D.getInvalidType()) 1208 NewTD->setInvalidDecl(); 1209 return NewTD; 1210} 1211 1212/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1213/// former case, Name will be non-null. In the later case, Name will be null. 1214/// TagType indicates what kind of tag this is. TK indicates whether this is a 1215/// reference/declaration/definition of a tag. 1216Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1217 SourceLocation KWLoc, IdentifierInfo *Name, 1218 SourceLocation NameLoc, AttributeList *Attr) { 1219 // If this is a use of an existing tag, it must have a name. 1220 assert((Name != 0 || TK == TK_Definition) && 1221 "Nameless record must be a definition!"); 1222 1223 Decl::Kind Kind; 1224 switch (TagType) { 1225 default: assert(0 && "Unknown tag type!"); 1226 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1227 case DeclSpec::TST_union: Kind = Decl::Union; break; 1228//case DeclSpec::TST_class: Kind = Decl::Class; break; 1229 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1230 } 1231 1232 // If this is a named struct, check to see if there was a previous forward 1233 // declaration or definition. 1234 if (TagDecl *PrevDecl = 1235 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1236 1237 // If this is a use of a previous tag, or if the tag is already declared in 1238 // the same scope (so that the definition/declaration completes or 1239 // rementions the tag), reuse the decl. 1240 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1241 // Make sure that this wasn't declared as an enum and now used as a struct 1242 // or something similar. 1243 if (PrevDecl->getKind() != Kind) { 1244 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1245 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1246 } 1247 1248 // If this is a use or a forward declaration, we're good. 1249 if (TK != TK_Definition) 1250 return PrevDecl; 1251 1252 // Diagnose attempts to redefine a tag. 1253 if (PrevDecl->isDefinition()) { 1254 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1255 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1256 // If this is a redefinition, recover by making this struct be 1257 // anonymous, which will make any later references get the previous 1258 // definition. 1259 Name = 0; 1260 } else { 1261 // Okay, this is definition of a previously declared or referenced tag. 1262 // Move the location of the decl to be the definition site. 1263 PrevDecl->setLocation(NameLoc); 1264 return PrevDecl; 1265 } 1266 } 1267 // If we get here, this is a definition of a new struct type in a nested 1268 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1269 // type. 1270 } 1271 1272 // If there is an identifier, use the location of the identifier as the 1273 // location of the decl, otherwise use the location of the struct/union 1274 // keyword. 1275 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1276 1277 // Otherwise, if this is the first time we've seen this tag, create the decl. 1278 TagDecl *New; 1279 switch (Kind) { 1280 default: assert(0 && "Unknown tag kind!"); 1281 case Decl::Enum: 1282 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1283 // enum X { A, B, C } D; D should chain to X. 1284 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1285 // If this is an undefined enum, warn. 1286 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1287 break; 1288 case Decl::Union: 1289 case Decl::Struct: 1290 case Decl::Class: 1291 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1292 // struct X { int A; } D; D should chain to X. 1293 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1294 break; 1295 } 1296 1297 // If this has an identifier, add it to the scope stack. 1298 if (Name) { 1299 // The scope passed in may not be a decl scope. Zip up the scope tree until 1300 // we find one that is. 1301 while ((S->getFlags() & Scope::DeclScope) == 0) 1302 S = S->getParent(); 1303 1304 // Add it to the decl chain. 1305 New->setNext(Name->getFETokenInfo<ScopedDecl>()); 1306 Name->setFETokenInfo(New); 1307 S->AddDecl(New); 1308 } 1309 1310 HandleDeclAttributes(New, Attr, 0); 1311 return New; 1312} 1313 1314/// ActOnField - Each field of a struct/union/class is passed into this in order 1315/// to create a FieldDecl object for it. 1316Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *tagDecl, 1317 SourceLocation DeclStart, 1318 Declarator &D, ExprTy *BitfieldWidth) { 1319 IdentifierInfo *II = D.getIdentifier(); 1320 Expr *BitWidth = (Expr*)BitfieldWidth; 1321 Decl *TagDecl = static_cast<Decl *>(tagDecl); 1322 SourceLocation Loc = DeclStart; 1323 if (II) Loc = D.getIdentifierLoc(); 1324 1325 // FIXME: Unnamed fields can be handled in various different ways, for 1326 // example, unnamed unions inject all members into the struct namespace! 1327 1328 1329 if (BitWidth) { 1330 // TODO: Validate. 1331 //printf("WARNING: BITFIELDS IGNORED!\n"); 1332 1333 // 6.7.2.1p3 1334 // 6.7.2.1p4 1335 1336 } else { 1337 // Not a bitfield. 1338 1339 // validate II. 1340 1341 } 1342 1343 QualType T = GetTypeForDeclarator(D, S); 1344 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1345 bool InvalidDecl = false; 1346 1347 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1348 // than a variably modified type. 1349 if (T->isVariablyModifiedType()) { 1350 // FIXME: This diagnostic needs work 1351 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1352 InvalidDecl = true; 1353 } 1354 // FIXME: Chain fielddecls together. 1355 FieldDecl *NewFD; 1356 1357 if (isa<RecordDecl>(TagDecl)) 1358 NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1359 else if (isa<ObjCInterfaceDecl>(TagDecl) || 1360 isa<ObjCImplementationDecl>(TagDecl) || 1361 isa<ObjCCategoryDecl>(TagDecl) || 1362 // FIXME: ivars are currently used to model properties, and 1363 // properties can appear within a protocol. 1364 // See corresponding FIXME in DeclObjC.h:ObjCPropertyDecl. 1365 isa<ObjCProtocolDecl>(TagDecl)) 1366 NewFD = ObjCIvarDecl::Create(Context, Loc, II, T); 1367 else 1368 assert(0 && "Sema::ActOnField(): Unknown TagDecl"); 1369 1370 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1371 D.getAttributes()); 1372 1373 if (D.getInvalidType() || InvalidDecl) 1374 NewFD->setInvalidDecl(); 1375 return NewFD; 1376} 1377 1378/// TranslateIvarVisibility - Translate visibility from a token ID to an 1379/// AST enum value. 1380static ObjCIvarDecl::AccessControl 1381TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1382 switch (ivarVisibility) { 1383 case tok::objc_private: return ObjCIvarDecl::Private; 1384 case tok::objc_public: return ObjCIvarDecl::Public; 1385 case tok::objc_protected: return ObjCIvarDecl::Protected; 1386 case tok::objc_package: return ObjCIvarDecl::Package; 1387 default: assert(false && "Unknown visitibility kind"); 1388 } 1389} 1390 1391void Sema::ActOnFields(Scope* S, 1392 SourceLocation RecLoc, DeclTy *RecDecl, 1393 DeclTy **Fields, unsigned NumFields, 1394 SourceLocation LBrac, SourceLocation RBrac, 1395 tok::ObjCKeywordKind *visibility) { 1396 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1397 assert(EnclosingDecl && "missing record or interface decl"); 1398 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1399 1400 if (Record && Record->isDefinition()) { 1401 // Diagnose code like: 1402 // struct S { struct S {} X; }; 1403 // We discover this when we complete the outer S. Reject and ignore the 1404 // outer S. 1405 Diag(Record->getLocation(), diag::err_nested_redefinition, 1406 Record->getKindName()); 1407 Diag(RecLoc, diag::err_previous_definition); 1408 Record->setInvalidDecl(); 1409 return; 1410 } 1411 // Verify that all the fields are okay. 1412 unsigned NumNamedMembers = 0; 1413 llvm::SmallVector<FieldDecl*, 32> RecFields; 1414 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1415 1416 for (unsigned i = 0; i != NumFields; ++i) { 1417 1418 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1419 assert(FD && "missing field decl"); 1420 1421 // Remember all fields. 1422 RecFields.push_back(FD); 1423 1424 // Get the type for the field. 1425 Type *FDTy = FD->getType().getTypePtr(); 1426 1427 // If we have visibility info, make sure the AST is set accordingly. 1428 if (visibility) 1429 cast<ObjCIvarDecl>(FD)->setAccessControl( 1430 TranslateIvarVisibility(visibility[i])); 1431 1432 // C99 6.7.2.1p2 - A field may not be a function type. 1433 if (FDTy->isFunctionType()) { 1434 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1435 FD->getName()); 1436 FD->setInvalidDecl(); 1437 EnclosingDecl->setInvalidDecl(); 1438 continue; 1439 } 1440 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1441 if (FDTy->isIncompleteType()) { 1442 if (!Record) { // Incomplete ivar type is always an error. 1443 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1444 FD->setInvalidDecl(); 1445 EnclosingDecl->setInvalidDecl(); 1446 continue; 1447 } 1448 if (i != NumFields-1 || // ... that the last member ... 1449 Record->getKind() != Decl::Struct || // ... of a structure ... 1450 !FDTy->isArrayType()) { //... may have incomplete array type. 1451 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1452 FD->setInvalidDecl(); 1453 EnclosingDecl->setInvalidDecl(); 1454 continue; 1455 } 1456 if (NumNamedMembers < 1) { //... must have more than named member ... 1457 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1458 FD->getName()); 1459 FD->setInvalidDecl(); 1460 EnclosingDecl->setInvalidDecl(); 1461 continue; 1462 } 1463 // Okay, we have a legal flexible array member at the end of the struct. 1464 if (Record) 1465 Record->setHasFlexibleArrayMember(true); 1466 } 1467 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1468 /// field of another structure or the element of an array. 1469 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1470 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1471 // If this is a member of a union, then entire union becomes "flexible". 1472 if (Record && Record->getKind() == Decl::Union) { 1473 Record->setHasFlexibleArrayMember(true); 1474 } else { 1475 // If this is a struct/class and this is not the last element, reject 1476 // it. Note that GCC supports variable sized arrays in the middle of 1477 // structures. 1478 if (i != NumFields-1) { 1479 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1480 FD->getName()); 1481 FD->setInvalidDecl(); 1482 EnclosingDecl->setInvalidDecl(); 1483 continue; 1484 } 1485 // We support flexible arrays at the end of structs in other structs 1486 // as an extension. 1487 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1488 FD->getName()); 1489 if (Record) 1490 Record->setHasFlexibleArrayMember(true); 1491 } 1492 } 1493 } 1494 /// A field cannot be an Objective-c object 1495 if (FDTy->isObjCInterfaceType()) { 1496 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1497 FD->getName()); 1498 FD->setInvalidDecl(); 1499 EnclosingDecl->setInvalidDecl(); 1500 continue; 1501 } 1502 // Keep track of the number of named members. 1503 if (IdentifierInfo *II = FD->getIdentifier()) { 1504 // Detect duplicate member names. 1505 if (!FieldIDs.insert(II)) { 1506 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1507 // Find the previous decl. 1508 SourceLocation PrevLoc; 1509 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1510 assert(i != e && "Didn't find previous def!"); 1511 if (RecFields[i]->getIdentifier() == II) { 1512 PrevLoc = RecFields[i]->getLocation(); 1513 break; 1514 } 1515 } 1516 Diag(PrevLoc, diag::err_previous_definition); 1517 FD->setInvalidDecl(); 1518 EnclosingDecl->setInvalidDecl(); 1519 continue; 1520 } 1521 ++NumNamedMembers; 1522 } 1523 } 1524 1525 // Okay, we successfully defined 'Record'. 1526 if (Record) { 1527 Record->defineBody(&RecFields[0], RecFields.size()); 1528 Consumer.HandleTagDeclDefinition(Record); 1529 } else { 1530 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1531 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1532 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1533 else if (ObjCImplementationDecl *IMPDecl = 1534 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1535 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1536 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1537 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1538 } 1539 } 1540} 1541 1542Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1543 DeclTy *lastEnumConst, 1544 SourceLocation IdLoc, IdentifierInfo *Id, 1545 SourceLocation EqualLoc, ExprTy *val) { 1546 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1547 EnumConstantDecl *LastEnumConst = 1548 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1549 Expr *Val = static_cast<Expr*>(val); 1550 1551 // The scope passed in may not be a decl scope. Zip up the scope tree until 1552 // we find one that is. 1553 while ((S->getFlags() & Scope::DeclScope) == 0) 1554 S = S->getParent(); 1555 1556 // Verify that there isn't already something declared with this name in this 1557 // scope. 1558 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1559 if (S->isDeclScope(PrevDecl)) { 1560 if (isa<EnumConstantDecl>(PrevDecl)) 1561 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1562 else 1563 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1564 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1565 delete Val; 1566 return 0; 1567 } 1568 } 1569 1570 llvm::APSInt EnumVal(32); 1571 QualType EltTy; 1572 if (Val) { 1573 // Make sure to promote the operand type to int. 1574 UsualUnaryConversions(Val); 1575 1576 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1577 SourceLocation ExpLoc; 1578 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1579 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1580 Id->getName()); 1581 delete Val; 1582 Val = 0; // Just forget about it. 1583 } else { 1584 EltTy = Val->getType(); 1585 } 1586 } 1587 1588 if (!Val) { 1589 if (LastEnumConst) { 1590 // Assign the last value + 1. 1591 EnumVal = LastEnumConst->getInitVal(); 1592 ++EnumVal; 1593 1594 // Check for overflow on increment. 1595 if (EnumVal < LastEnumConst->getInitVal()) 1596 Diag(IdLoc, diag::warn_enum_value_overflow); 1597 1598 EltTy = LastEnumConst->getType(); 1599 } else { 1600 // First value, set to zero. 1601 EltTy = Context.IntTy; 1602 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1603 } 1604 } 1605 1606 EnumConstantDecl *New = 1607 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1608 Val, EnumVal, 1609 LastEnumConst); 1610 1611 // Register this decl in the current scope stack. 1612 New->setNext(Id->getFETokenInfo<ScopedDecl>()); 1613 Id->setFETokenInfo(New); 1614 S->AddDecl(New); 1615 return New; 1616} 1617 1618void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1619 DeclTy **Elements, unsigned NumElements) { 1620 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1621 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1622 1623 // TODO: If the result value doesn't fit in an int, it must be a long or long 1624 // long value. ISO C does not support this, but GCC does as an extension, 1625 // emit a warning. 1626 unsigned IntWidth = Context.Target.getIntWidth(); 1627 1628 // Verify that all the values are okay, compute the size of the values, and 1629 // reverse the list. 1630 unsigned NumNegativeBits = 0; 1631 unsigned NumPositiveBits = 0; 1632 1633 // Keep track of whether all elements have type int. 1634 bool AllElementsInt = true; 1635 1636 EnumConstantDecl *EltList = 0; 1637 for (unsigned i = 0; i != NumElements; ++i) { 1638 EnumConstantDecl *ECD = 1639 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1640 if (!ECD) continue; // Already issued a diagnostic. 1641 1642 // If the enum value doesn't fit in an int, emit an extension warning. 1643 const llvm::APSInt &InitVal = ECD->getInitVal(); 1644 assert(InitVal.getBitWidth() >= IntWidth && 1645 "Should have promoted value to int"); 1646 if (InitVal.getBitWidth() > IntWidth) { 1647 llvm::APSInt V(InitVal); 1648 V.trunc(IntWidth); 1649 V.extend(InitVal.getBitWidth()); 1650 if (V != InitVal) 1651 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1652 InitVal.toString()); 1653 } 1654 1655 // Keep track of the size of positive and negative values. 1656 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1657 NumPositiveBits = std::max(NumPositiveBits, 1658 (unsigned)InitVal.getActiveBits()); 1659 else 1660 NumNegativeBits = std::max(NumNegativeBits, 1661 (unsigned)InitVal.getMinSignedBits()); 1662 1663 // Keep track of whether every enum element has type int (very commmon). 1664 if (AllElementsInt) 1665 AllElementsInt = ECD->getType() == Context.IntTy; 1666 1667 ECD->setNextDeclarator(EltList); 1668 EltList = ECD; 1669 } 1670 1671 // Figure out the type that should be used for this enum. 1672 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1673 QualType BestType; 1674 unsigned BestWidth; 1675 1676 if (NumNegativeBits) { 1677 // If there is a negative value, figure out the smallest integer type (of 1678 // int/long/longlong) that fits. 1679 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1680 BestType = Context.IntTy; 1681 BestWidth = IntWidth; 1682 } else { 1683 BestWidth = Context.Target.getLongWidth(); 1684 1685 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1686 BestType = Context.LongTy; 1687 else { 1688 BestWidth = Context.Target.getLongLongWidth(); 1689 1690 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1691 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1692 BestType = Context.LongLongTy; 1693 } 1694 } 1695 } else { 1696 // If there is no negative value, figure out which of uint, ulong, ulonglong 1697 // fits. 1698 if (NumPositiveBits <= IntWidth) { 1699 BestType = Context.UnsignedIntTy; 1700 BestWidth = IntWidth; 1701 } else if (NumPositiveBits <= 1702 (BestWidth = Context.Target.getLongWidth())) { 1703 BestType = Context.UnsignedLongTy; 1704 } else { 1705 BestWidth = Context.Target.getLongLongWidth(); 1706 assert(NumPositiveBits <= BestWidth && 1707 "How could an initializer get larger than ULL?"); 1708 BestType = Context.UnsignedLongLongTy; 1709 } 1710 } 1711 1712 // Loop over all of the enumerator constants, changing their types to match 1713 // the type of the enum if needed. 1714 for (unsigned i = 0; i != NumElements; ++i) { 1715 EnumConstantDecl *ECD = 1716 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1717 if (!ECD) continue; // Already issued a diagnostic. 1718 1719 // Standard C says the enumerators have int type, but we allow, as an 1720 // extension, the enumerators to be larger than int size. If each 1721 // enumerator value fits in an int, type it as an int, otherwise type it the 1722 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1723 // that X has type 'int', not 'unsigned'. 1724 if (ECD->getType() == Context.IntTy) { 1725 // Make sure the init value is signed. 1726 llvm::APSInt IV = ECD->getInitVal(); 1727 IV.setIsSigned(true); 1728 ECD->setInitVal(IV); 1729 continue; // Already int type. 1730 } 1731 1732 // Determine whether the value fits into an int. 1733 llvm::APSInt InitVal = ECD->getInitVal(); 1734 bool FitsInInt; 1735 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1736 FitsInInt = InitVal.getActiveBits() < IntWidth; 1737 else 1738 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1739 1740 // If it fits into an integer type, force it. Otherwise force it to match 1741 // the enum decl type. 1742 QualType NewTy; 1743 unsigned NewWidth; 1744 bool NewSign; 1745 if (FitsInInt) { 1746 NewTy = Context.IntTy; 1747 NewWidth = IntWidth; 1748 NewSign = true; 1749 } else if (ECD->getType() == BestType) { 1750 // Already the right type! 1751 continue; 1752 } else { 1753 NewTy = BestType; 1754 NewWidth = BestWidth; 1755 NewSign = BestType->isSignedIntegerType(); 1756 } 1757 1758 // Adjust the APSInt value. 1759 InitVal.extOrTrunc(NewWidth); 1760 InitVal.setIsSigned(NewSign); 1761 ECD->setInitVal(InitVal); 1762 1763 // Adjust the Expr initializer and type. 1764 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1765 ECD->setType(NewTy); 1766 } 1767 1768 Enum->defineElements(EltList, BestType); 1769 Consumer.HandleTagDeclDefinition(Enum); 1770} 1771 1772Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1773 ExprTy *expr) { 1774 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1775 1776 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1777} 1778 1779Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1780 SourceLocation LBrace, 1781 SourceLocation RBrace, 1782 const char *Lang, 1783 unsigned StrSize, 1784 DeclTy *D) { 1785 LinkageSpecDecl::LanguageIDs Language; 1786 Decl *dcl = static_cast<Decl *>(D); 1787 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1788 Language = LinkageSpecDecl::lang_c; 1789 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1790 Language = LinkageSpecDecl::lang_cxx; 1791 else { 1792 Diag(Loc, diag::err_bad_language); 1793 return 0; 1794 } 1795 1796 // FIXME: Add all the various semantics of linkage specifications 1797 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1798} 1799 1800void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1801 1802 switch (Attr->getKind()) { 1803 case AttributeList::AT_vector_size: 1804 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1805 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1806 if (!newType.isNull()) // install the new vector type into the decl 1807 vDecl->setType(newType); 1808 } 1809 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1810 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1811 Attr); 1812 if (!newType.isNull()) // install the new vector type into the decl 1813 tDecl->setUnderlyingType(newType); 1814 } 1815 break; 1816 case AttributeList::AT_ocu_vector_type: 1817 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1818 HandleOCUVectorTypeAttribute(tDecl, Attr); 1819 else 1820 Diag(Attr->getLoc(), 1821 diag::err_typecheck_ocu_vector_not_typedef); 1822 break; 1823 case AttributeList::AT_address_space: 1824 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1825 QualType newType = HandleAddressSpaceTypeAttribute( 1826 tDecl->getUnderlyingType(), 1827 Attr); 1828 tDecl->setUnderlyingType(newType); 1829 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1830 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1831 Attr); 1832 // install the new addr spaced type into the decl 1833 vDecl->setType(newType); 1834 } 1835 break; 1836 case AttributeList::AT_deprecated: 1837 HandleDeprecatedAttribute(New, Attr); 1838 break; 1839 case AttributeList::AT_visibility: 1840 HandleVisibilityAttribute(New, Attr); 1841 break; 1842 case AttributeList::AT_weak: 1843 HandleWeakAttribute(New, Attr); 1844 break; 1845 case AttributeList::AT_dllimport: 1846 HandleDLLImportAttribute(New, Attr); 1847 break; 1848 case AttributeList::AT_dllexport: 1849 HandleDLLExportAttribute(New, Attr); 1850 break; 1851 case AttributeList::AT_nothrow: 1852 HandleNothrowAttribute(New, Attr); 1853 break; 1854 case AttributeList::AT_stdcall: 1855 HandleStdCallAttribute(New, Attr); 1856 break; 1857 case AttributeList::AT_fastcall: 1858 HandleFastCallAttribute(New, Attr); 1859 break; 1860 case AttributeList::AT_aligned: 1861 HandleAlignedAttribute(New, Attr); 1862 break; 1863 case AttributeList::AT_packed: 1864 HandlePackedAttribute(New, Attr); 1865 break; 1866 case AttributeList::AT_annotate: 1867 HandleAnnotateAttribute(New, Attr); 1868 break; 1869 case AttributeList::AT_noreturn: 1870 HandleNoReturnAttribute(New, Attr); 1871 break; 1872 case AttributeList::AT_format: 1873 HandleFormatAttribute(New, Attr); 1874 break; 1875 default: 1876#if 0 1877 // TODO: when we have the full set of attributes, warn about unknown ones. 1878 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1879 Attr->getName()->getName()); 1880#endif 1881 break; 1882 } 1883} 1884 1885void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 1886 AttributeList *declarator_postfix) { 1887 while (declspec_prefix) { 1888 HandleDeclAttribute(New, declspec_prefix); 1889 declspec_prefix = declspec_prefix->getNext(); 1890 } 1891 while (declarator_postfix) { 1892 HandleDeclAttribute(New, declarator_postfix); 1893 declarator_postfix = declarator_postfix->getNext(); 1894 } 1895} 1896 1897void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 1898 AttributeList *rawAttr) { 1899 QualType curType = tDecl->getUnderlyingType(); 1900 // check the attribute arguments. 1901 if (rawAttr->getNumArgs() != 1) { 1902 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1903 std::string("1")); 1904 return; 1905 } 1906 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1907 llvm::APSInt vecSize(32); 1908 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1909 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1910 "ocu_vector_type", sizeExpr->getSourceRange()); 1911 return; 1912 } 1913 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1914 // in conjunction with complex types (pointers, arrays, functions, etc.). 1915 Type *canonType = curType.getCanonicalType().getTypePtr(); 1916 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1917 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1918 curType.getCanonicalType().getAsString()); 1919 return; 1920 } 1921 // unlike gcc's vector_size attribute, the size is specified as the 1922 // number of elements, not the number of bytes. 1923 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1924 1925 if (vectorSize == 0) { 1926 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1927 sizeExpr->getSourceRange()); 1928 return; 1929 } 1930 // Instantiate/Install the vector type, the number of elements is > 0. 1931 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 1932 // Remember this typedef decl, we will need it later for diagnostics. 1933 OCUVectorDecls.push_back(tDecl); 1934} 1935 1936QualType Sema::HandleVectorTypeAttribute(QualType curType, 1937 AttributeList *rawAttr) { 1938 // check the attribute arugments. 1939 if (rawAttr->getNumArgs() != 1) { 1940 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1941 std::string("1")); 1942 return QualType(); 1943 } 1944 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1945 llvm::APSInt vecSize(32); 1946 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1947 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1948 "vector_size", sizeExpr->getSourceRange()); 1949 return QualType(); 1950 } 1951 // navigate to the base type - we need to provide for vector pointers, 1952 // vector arrays, and functions returning vectors. 1953 Type *canonType = curType.getCanonicalType().getTypePtr(); 1954 1955 if (canonType->isPointerType() || canonType->isArrayType() || 1956 canonType->isFunctionType()) { 1957 assert(0 && "HandleVector(): Complex type construction unimplemented"); 1958 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 1959 do { 1960 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 1961 canonType = PT->getPointeeType().getTypePtr(); 1962 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 1963 canonType = AT->getElementType().getTypePtr(); 1964 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 1965 canonType = FT->getResultType().getTypePtr(); 1966 } while (canonType->isPointerType() || canonType->isArrayType() || 1967 canonType->isFunctionType()); 1968 */ 1969 } 1970 // the base type must be integer or float. 1971 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1972 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1973 curType.getCanonicalType().getAsString()); 1974 return QualType(); 1975 } 1976 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 1977 // vecSize is specified in bytes - convert to bits. 1978 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1979 1980 // the vector size needs to be an integral multiple of the type size. 1981 if (vectorSize % typeSize) { 1982 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 1983 sizeExpr->getSourceRange()); 1984 return QualType(); 1985 } 1986 if (vectorSize == 0) { 1987 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1988 sizeExpr->getSourceRange()); 1989 return QualType(); 1990 } 1991 // Instantiate the vector type, the number of elements is > 0, and not 1992 // required to be a power of 2, unlike GCC. 1993 return Context.getVectorType(curType, vectorSize/typeSize); 1994} 1995 1996void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 1997 // check the attribute arguments. 1998 if (rawAttr->getNumArgs() > 0) { 1999 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2000 std::string("0")); 2001 return; 2002 } 2003 2004 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 2005 TD->addAttr(new PackedAttr); 2006 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 2007 // If the alignment is less than or equal to 8 bits, the packed attribute 2008 // has no effect. 2009 if (Context.getTypeAlign(FD->getType()) <= 8) 2010 Diag(rawAttr->getLoc(), 2011 diag::warn_attribute_ignored_for_field_of_type, 2012 rawAttr->getName()->getName(), FD->getType().getAsString()); 2013 else 2014 FD->addAttr(new PackedAttr); 2015 } else 2016 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2017 rawAttr->getName()->getName()); 2018} 2019 2020void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2021 // check the attribute arguments. 2022 if (rawAttr->getNumArgs() != 0) { 2023 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2024 std::string("0")); 2025 return; 2026 } 2027 2028 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2029 2030 if (!Fn) { 2031 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2032 "noreturn", "function"); 2033 return; 2034 } 2035 2036 d->addAttr(new NoReturnAttr()); 2037} 2038 2039void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2040 // check the attribute arguments. 2041 if (rawAttr->getNumArgs() != 0) { 2042 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2043 std::string("0")); 2044 return; 2045 } 2046 2047 d->addAttr(new DeprecatedAttr()); 2048} 2049 2050void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2051 // check the attribute arguments. 2052 if (rawAttr->getNumArgs() != 1) { 2053 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2054 std::string("1")); 2055 return; 2056 } 2057 2058 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2059 Arg = Arg->IgnoreParenCasts(); 2060 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2061 2062 if (Str == 0 || Str->isWide()) { 2063 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2064 "visibility", std::string("1")); 2065 return; 2066 } 2067 2068 const char *TypeStr = Str->getStrData(); 2069 unsigned TypeLen = Str->getByteLength(); 2070 llvm::GlobalValue::VisibilityTypes type; 2071 2072 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2073 type = llvm::GlobalValue::DefaultVisibility; 2074 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2075 type = llvm::GlobalValue::HiddenVisibility; 2076 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2077 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2078 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2079 type = llvm::GlobalValue::ProtectedVisibility; 2080 else { 2081 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2082 "visibility", TypeStr); 2083 return; 2084 } 2085 2086 d->addAttr(new VisibilityAttr(type)); 2087} 2088 2089void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2090 // check the attribute arguments. 2091 if (rawAttr->getNumArgs() != 0) { 2092 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2093 std::string("0")); 2094 return; 2095 } 2096 2097 d->addAttr(new WeakAttr()); 2098} 2099 2100void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2101 // check the attribute arguments. 2102 if (rawAttr->getNumArgs() != 0) { 2103 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2104 std::string("0")); 2105 return; 2106 } 2107 2108 d->addAttr(new DLLImportAttr()); 2109} 2110 2111void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2112 // check the attribute arguments. 2113 if (rawAttr->getNumArgs() != 0) { 2114 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2115 std::string("0")); 2116 return; 2117 } 2118 2119 d->addAttr(new DLLExportAttr()); 2120} 2121 2122void Sema::HandleStdCallAttribute(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 d->addAttr(new StdCallAttr()); 2131} 2132 2133void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2134 // check the attribute arguments. 2135 if (rawAttr->getNumArgs() != 0) { 2136 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2137 std::string("0")); 2138 return; 2139 } 2140 2141 d->addAttr(new FastCallAttr()); 2142} 2143 2144void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2145 // check the attribute arguments. 2146 if (rawAttr->getNumArgs() != 0) { 2147 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2148 std::string("0")); 2149 return; 2150 } 2151 2152 d->addAttr(new NoThrowAttr()); 2153} 2154 2155static const FunctionTypeProto *getFunctionProto(Decl *d) { 2156 ValueDecl *decl = dyn_cast<ValueDecl>(d); 2157 if (!decl) return 0; 2158 2159 QualType Ty = decl->getType(); 2160 2161 if (Ty->isFunctionPointerType()) { 2162 const PointerType *PtrTy = Ty->getAsPointerType(); 2163 Ty = PtrTy->getPointeeType(); 2164 } 2165 2166 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2167 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2168 2169 return 0; 2170} 2171 2172 2173/// Handle __attribute__((format(type,idx,firstarg))) attributes 2174/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2175void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2176 2177 if (!rawAttr->getParameterName()) { 2178 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2179 "format", std::string("1")); 2180 return; 2181 } 2182 2183 if (rawAttr->getNumArgs() != 2) { 2184 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2185 std::string("3")); 2186 return; 2187 } 2188 2189 // GCC ignores the format attribute on K&R style function 2190 // prototypes, so we ignore it as well 2191 const FunctionTypeProto *proto = getFunctionProto(d); 2192 2193 if (!proto) { 2194 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2195 "format", "function"); 2196 return; 2197 } 2198 2199 // FIXME: in C++ the implicit 'this' function parameter also counts. 2200 // this is needed in order to be compatible with GCC 2201 // the index must start in 1 and the limit is numargs+1 2202 unsigned NumArgs = proto->getNumArgs(); 2203 unsigned FirstIdx = 1; 2204 2205 const char *Format = rawAttr->getParameterName()->getName(); 2206 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2207 2208 // Normalize the argument, __foo__ becomes foo. 2209 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2210 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2211 Format += 2; 2212 FormatLen -= 4; 2213 } 2214 2215 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2216 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2217 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2218 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2219 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2220 "format", rawAttr->getParameterName()->getName()); 2221 return; 2222 } 2223 2224 // checks for the 2nd argument 2225 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2226 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2227 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2228 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2229 "format", std::string("2"), IdxExpr->getSourceRange()); 2230 return; 2231 } 2232 2233 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2234 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2235 "format", std::string("2"), IdxExpr->getSourceRange()); 2236 return; 2237 } 2238 2239 // make sure the format string is really a string 2240 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2241 if (!Ty->isPointerType() || 2242 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2243 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2244 IdxExpr->getSourceRange()); 2245 return; 2246 } 2247 2248 2249 // check the 3rd argument 2250 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2251 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2252 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2253 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2254 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2255 return; 2256 } 2257 2258 // check if the function is variadic if the 3rd argument non-zero 2259 if (FirstArg != 0) { 2260 if (proto->isVariadic()) { 2261 ++NumArgs; // +1 for ... 2262 } else { 2263 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2264 return; 2265 } 2266 } 2267 2268 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2269 // the input is just the current time + the format string 2270 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2271 if (FirstArg != 0) { 2272 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2273 FirstArgExpr->getSourceRange()); 2274 return; 2275 } 2276 // if 0 it disables parameter checking (to use with e.g. va_list) 2277 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2278 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2279 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2280 return; 2281 } 2282 2283 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2284 Idx.getZExtValue(), FirstArg.getZExtValue())); 2285} 2286 2287void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2288 // check the attribute arguments. 2289 if (rawAttr->getNumArgs() != 1) { 2290 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2291 std::string("1")); 2292 return; 2293 } 2294 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2295 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2296 2297 // Make sure that there is a string literal as the annotation's single 2298 // argument. 2299 if (!SE) { 2300 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2301 return; 2302 } 2303 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2304 SE->getByteLength()))); 2305} 2306 2307void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2308{ 2309 // check the attribute arguments. 2310 if (rawAttr->getNumArgs() > 1) { 2311 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2312 std::string("1")); 2313 return; 2314 } 2315 2316 unsigned Align = 0; 2317 2318 if (rawAttr->getNumArgs() == 0) { 2319 // FIXME: This should be the target specific maximum alignment. 2320 // (For now we just use 128 bits which is the maximum on X86. 2321 Align = 128; 2322 return; 2323 } else { 2324 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2325 llvm::APSInt alignment(32); 2326 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2327 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2328 "aligned", alignmentExpr->getSourceRange()); 2329 return; 2330 } 2331 2332 Align = alignment.getZExtValue() * 8; 2333 } 2334 2335 d->addAttr(new AlignedAttr(Align)); 2336} 2337