SemaDecl.cpp revision 0ed844b04ea4387caa4e1cf3dc375d269657536b
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::PushContextDecl(ContextDecl *CD) { 44 assert(CD->getParent() == CurContext && 45 "The next ContextDecl should be directly contained in the current one."); 46 CurContext = CD; 47} 48 49void Sema::PopContextDecl() { 50 assert(CurContext && "ContextDecl 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 = Old->getCanonicalType(); 284 QualType NewQType = New->getCanonicalType(); 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 = Old->getBody() ? diag::err_previous_definition : 294 diag::err_previous_declaration; 295 296 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 297 // TODO: This is totally simplistic. It should handle merging functions 298 // together etc, merging extern int X; int X; ... 299 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 300 Diag(Old->getLocation(), PrevDiag); 301 return New; 302} 303 304/// equivalentArrayTypes - Used to determine whether two array types are 305/// equivalent. 306/// We need to check this explicitly as an incomplete array definition is 307/// considered a VariableArrayType, so will not match a complete array 308/// definition that would be otherwise equivalent. 309static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 310 const ArrayType *NewAT = NewQType->getAsArrayType(); 311 const ArrayType *OldAT = OldQType->getAsArrayType(); 312 313 if (!NewAT || !OldAT) 314 return false; 315 316 // If either (or both) array types in incomplete we need to strip off the 317 // outer VariableArrayType. Once the outer VAT is removed the remaining 318 // types must be identical if the array types are to be considered 319 // equivalent. 320 // eg. int[][1] and int[1][1] become 321 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 322 // removing the outermost VAT gives 323 // CAT(1, int) and CAT(1, int) 324 // which are equal, therefore the array types are equivalent. 325 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 326 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 327 return false; 328 NewQType = NewAT->getElementType().getCanonicalType(); 329 OldQType = OldAT->getElementType().getCanonicalType(); 330 } 331 332 return NewQType == OldQType; 333} 334 335/// MergeVarDecl - We just parsed a variable 'New' which has the same name 336/// and scope as a previous declaration 'Old'. Figure out how to resolve this 337/// situation, merging decls or emitting diagnostics as appropriate. 338/// 339/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 340/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 341/// 342VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 343 // Verify the old decl was also a variable. 344 VarDecl *Old = dyn_cast<VarDecl>(OldD); 345 if (!Old) { 346 Diag(New->getLocation(), diag::err_redefinition_different_kind, 347 New->getName()); 348 Diag(OldD->getLocation(), diag::err_previous_definition); 349 return New; 350 } 351 352 MergeAttributes(New, Old); 353 354 // Verify the types match. 355 if (Old->getCanonicalType() != New->getCanonicalType() && 356 !areEquivalentArrayTypes(New->getCanonicalType(), Old->getCanonicalType())) { 357 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 358 Diag(Old->getLocation(), diag::err_previous_definition); 359 return New; 360 } 361 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 362 if (New->getStorageClass() == VarDecl::Static && 363 (Old->getStorageClass() == VarDecl::None || 364 Old->getStorageClass() == VarDecl::Extern)) { 365 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 366 Diag(Old->getLocation(), diag::err_previous_definition); 367 return New; 368 } 369 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 370 if (New->getStorageClass() != VarDecl::Static && 371 Old->getStorageClass() == VarDecl::Static) { 372 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 373 Diag(Old->getLocation(), diag::err_previous_definition); 374 return New; 375 } 376 // We've verified the types match, now handle "tentative" definitions. 377 FileVarDecl *OldFSDecl = dyn_cast<FileVarDecl>(Old); 378 FileVarDecl *NewFSDecl = dyn_cast<FileVarDecl>(New); 379 380 if (OldFSDecl && NewFSDecl) { 381 // Handle C "tentative" external object definitions (C99 6.9.2). 382 bool OldIsTentative = false; 383 bool NewIsTentative = false; 384 385 if (!OldFSDecl->getInit() && 386 (OldFSDecl->getStorageClass() == VarDecl::None || 387 OldFSDecl->getStorageClass() == VarDecl::Static)) 388 OldIsTentative = true; 389 390 // FIXME: this check doesn't work (since the initializer hasn't been 391 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 392 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 393 // thrown out the old decl. 394 if (!NewFSDecl->getInit() && 395 (NewFSDecl->getStorageClass() == VarDecl::None || 396 NewFSDecl->getStorageClass() == VarDecl::Static)) 397 ; // change to NewIsTentative = true; once the code is moved. 398 399 if (NewIsTentative || OldIsTentative) 400 return New; 401 } 402 if (Old->getStorageClass() != VarDecl::Extern && 403 New->getStorageClass() != VarDecl::Extern) { 404 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 405 Diag(Old->getLocation(), diag::err_previous_definition); 406 } 407 return New; 408} 409 410/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 411/// no declarator (e.g. "struct foo;") is parsed. 412Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 413 // TODO: emit error on 'int;' or 'const enum foo;'. 414 // TODO: emit error on 'typedef int;' 415 // if (!DS.isMissingDeclaratorOk()) Diag(...); 416 417 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 418} 419 420bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 421 // Get the type before calling CheckSingleAssignmentConstraints(), since 422 // it can promote the expression. 423 QualType InitType = Init->getType(); 424 425 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 426 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 427 InitType, Init, "initializing"); 428} 429 430bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 431 QualType ElementType) { 432 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 433 if (CheckSingleInitializer(expr, ElementType)) 434 return true; // types weren't compatible. 435 436 if (savExpr != expr) // The type was promoted, update initializer list. 437 IList->setInit(slot, expr); 438 return false; 439} 440 441bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 442 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 443 // C99 6.7.8p14. We have an array of character type with unknown size 444 // being initialized to a string literal. 445 llvm::APSInt ConstVal(32); 446 ConstVal = strLiteral->getByteLength() + 1; 447 // Return a new array type (C99 6.7.8p22). 448 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 449 ArrayType::Normal, 0); 450 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 451 // C99 6.7.8p14. We have an array of character type with known size. 452 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 453 Diag(strLiteral->getSourceRange().getBegin(), 454 diag::warn_initializer_string_for_char_array_too_long, 455 strLiteral->getSourceRange()); 456 } else { 457 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 458 } 459 // Set type from "char *" to "constant array of char". 460 strLiteral->setType(DeclT); 461 // For now, we always return false (meaning success). 462 return false; 463} 464 465StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 466 const ArrayType *AT = DeclType->getAsArrayType(); 467 if (AT && AT->getElementType()->isCharType()) { 468 return dyn_cast<StringLiteral>(Init); 469 } 470 return 0; 471} 472 473// CheckInitializerListTypes - Checks the types of elements of an initializer 474// list. This function is recursive: it calls itself to initialize subelements 475// of aggregate types. Note that the topLevel parameter essentially refers to 476// whether this expression "owns" the initializer list passed in, or if this 477// initialization is taking elements out of a parent initializer. Each 478// call to this function adds zero or more to startIndex, reports any errors, 479// and returns true if it found any inconsistent types. 480bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 481 bool topLevel, unsigned& startIndex) { 482 bool hadError = false; 483 484 if (DeclType->isScalarType()) { 485 // The simplest case: initializing a single scalar 486 if (topLevel) { 487 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 488 IList->getSourceRange()); 489 } 490 if (startIndex < IList->getNumInits()) { 491 Expr* expr = IList->getInit(startIndex); 492 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 493 // FIXME: Should an error be reported here instead? 494 unsigned newIndex = 0; 495 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 496 } else { 497 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 498 } 499 ++startIndex; 500 } 501 // FIXME: Should an error be reported for empty initializer list + scalar? 502 } else if (DeclType->isVectorType()) { 503 if (startIndex < IList->getNumInits()) { 504 const VectorType *VT = DeclType->getAsVectorType(); 505 int maxElements = VT->getNumElements(); 506 QualType elementType = VT->getElementType(); 507 508 for (int i = 0; i < maxElements; ++i) { 509 // Don't attempt to go past the end of the init list 510 if (startIndex >= IList->getNumInits()) 511 break; 512 Expr* expr = IList->getInit(startIndex); 513 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 514 unsigned newIndex = 0; 515 hadError |= CheckInitializerListTypes(SubInitList, elementType, 516 true, newIndex); 517 ++startIndex; 518 } else { 519 hadError |= CheckInitializerListTypes(IList, elementType, 520 false, startIndex); 521 } 522 } 523 } 524 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 525 if (DeclType->isStructureType() || DeclType->isUnionType()) { 526 if (startIndex < IList->getNumInits() && !topLevel && 527 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 528 DeclType)) { 529 // We found a compatible struct; per the standard, this initializes the 530 // struct. (The C standard technically says that this only applies for 531 // initializers for declarations with automatic scope; however, this 532 // construct is unambiguous anyway because a struct cannot contain 533 // a type compatible with itself. We'll output an error when we check 534 // if the initializer is constant.) 535 // FIXME: Is a call to CheckSingleInitializer required here? 536 ++startIndex; 537 } else { 538 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 539 540 // If the record is invalid, some of it's members are invalid. To avoid 541 // confusion, we forgo checking the intializer for the entire record. 542 if (structDecl->isInvalidDecl()) 543 return true; 544 545 // If structDecl is a forward declaration, this loop won't do anything; 546 // That's okay, because an error should get printed out elsewhere. It 547 // might be worthwhile to skip over the rest of the initializer, though. 548 int numMembers = structDecl->getNumMembers() - 549 structDecl->hasFlexibleArrayMember(); 550 for (int i = 0; i < numMembers; i++) { 551 // Don't attempt to go past the end of the init list 552 if (startIndex >= IList->getNumInits()) 553 break; 554 FieldDecl * curField = structDecl->getMember(i); 555 if (!curField->getIdentifier()) { 556 // Don't initialize unnamed fields, e.g. "int : 20;" 557 continue; 558 } 559 QualType fieldType = curField->getType(); 560 Expr* expr = IList->getInit(startIndex); 561 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 562 unsigned newStart = 0; 563 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 564 true, newStart); 565 ++startIndex; 566 } else { 567 hadError |= CheckInitializerListTypes(IList, fieldType, 568 false, startIndex); 569 } 570 if (DeclType->isUnionType()) 571 break; 572 } 573 // FIXME: Implement flexible array initialization GCC extension (it's a 574 // really messy extension to implement, unfortunately...the necessary 575 // information isn't actually even here!) 576 } 577 } else if (DeclType->isArrayType()) { 578 // Check for the special-case of initializing an array with a string. 579 if (startIndex < IList->getNumInits()) { 580 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 581 DeclType)) { 582 CheckStringLiteralInit(lit, DeclType); 583 ++startIndex; 584 if (topLevel && startIndex < IList->getNumInits()) { 585 // We have leftover initializers; warn 586 Diag(IList->getInit(startIndex)->getLocStart(), 587 diag::err_excess_initializers_in_char_array_initializer, 588 IList->getInit(startIndex)->getSourceRange()); 589 } 590 return false; 591 } 592 } 593 int maxElements; 594 if (DeclType->isIncompleteArrayType()) { 595 // FIXME: use a proper constant 596 maxElements = 0x7FFFFFFF; 597 } else if (const VariableArrayType *VAT = 598 DeclType->getAsVariableArrayType()) { 599 // Check for VLAs; in standard C it would be possible to check this 600 // earlier, but I don't know where clang accepts VLAs (gcc accepts 601 // them in all sorts of strange places). 602 Diag(VAT->getSizeExpr()->getLocStart(), 603 diag::err_variable_object_no_init, 604 VAT->getSizeExpr()->getSourceRange()); 605 hadError = true; 606 maxElements = 0x7FFFFFFF; 607 } else { 608 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 609 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 610 } 611 QualType elementType = DeclType->getAsArrayType()->getElementType(); 612 int numElements = 0; 613 for (int i = 0; i < maxElements; ++i, ++numElements) { 614 // Don't attempt to go past the end of the init list 615 if (startIndex >= IList->getNumInits()) 616 break; 617 Expr* expr = IList->getInit(startIndex); 618 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 619 unsigned newIndex = 0; 620 hadError |= CheckInitializerListTypes(SubInitList, elementType, 621 true, newIndex); 622 ++startIndex; 623 } else { 624 hadError |= CheckInitializerListTypes(IList, elementType, 625 false, startIndex); 626 } 627 } 628 if (DeclType->isIncompleteArrayType()) { 629 // If this is an incomplete array type, the actual type needs to 630 // be calculated here 631 if (numElements == 0) { 632 // Sizing an array implicitly to zero is not allowed 633 // (It could in theory be allowed, but it doesn't really matter.) 634 Diag(IList->getLocStart(), 635 diag::err_at_least_one_initializer_needed_to_size_array); 636 hadError = true; 637 } else { 638 llvm::APSInt ConstVal(32); 639 ConstVal = numElements; 640 DeclType = Context.getConstantArrayType(elementType, ConstVal, 641 ArrayType::Normal, 0); 642 } 643 } 644 } else { 645 assert(0 && "Aggregate that isn't a function or array?!"); 646 } 647 } else { 648 // In C, all types are either scalars or aggregates, but 649 // additional handling is needed here for C++ (and possibly others?). 650 assert(0 && "Unsupported initializer type"); 651 } 652 653 // If this init list is a base list, we set the type; an initializer doesn't 654 // fundamentally have a type, but this makes the ASTs a bit easier to read 655 if (topLevel) 656 IList->setType(DeclType); 657 658 if (topLevel && startIndex < IList->getNumInits()) { 659 // We have leftover initializers; warn 660 Diag(IList->getInit(startIndex)->getLocStart(), 661 diag::warn_excess_initializers, 662 IList->getInit(startIndex)->getSourceRange()); 663 } 664 return hadError; 665} 666 667bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 668 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 669 // of unknown size ("[]") or an object type that is not a variable array type. 670 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 671 return Diag(VAT->getSizeExpr()->getLocStart(), 672 diag::err_variable_object_no_init, 673 VAT->getSizeExpr()->getSourceRange()); 674 675 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 676 if (!InitList) { 677 // FIXME: Handle wide strings 678 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 679 return CheckStringLiteralInit(strLiteral, DeclType); 680 681 if (DeclType->isArrayType()) 682 return Diag(Init->getLocStart(), 683 diag::err_array_init_list_required, 684 Init->getSourceRange()); 685 686 return CheckSingleInitializer(Init, DeclType); 687 } 688 unsigned newIndex = 0; 689 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 690} 691 692Sema::DeclTy * 693Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 694 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 695 IdentifierInfo *II = D.getIdentifier(); 696 697 // All of these full declarators require an identifier. If it doesn't have 698 // one, the ParsedFreeStandingDeclSpec action should be used. 699 if (II == 0) { 700 Diag(D.getDeclSpec().getSourceRange().getBegin(), 701 diag::err_declarator_need_ident, 702 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 703 return 0; 704 } 705 706 // The scope passed in may not be a decl scope. Zip up the scope tree until 707 // we find one that is. 708 while ((S->getFlags() & Scope::DeclScope) == 0) 709 S = S->getParent(); 710 711 // See if this is a redefinition of a variable in the same scope. 712 Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S); 713 ScopedDecl *New; 714 bool InvalidDecl = false; 715 716 QualType R = GetTypeForDeclarator(D, S); 717 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 718 719 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 720 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 721 if (!NewTD) return 0; 722 723 // Handle attributes prior to checking for duplicates in MergeVarDecl 724 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 725 D.getAttributes()); 726 // Merge the decl with the existing one if appropriate. If the decl is 727 // in an outer scope, it isn't the same thing. 728 if (PrevDecl && S->isDeclScope(PrevDecl)) { 729 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 730 if (NewTD == 0) return 0; 731 } 732 New = NewTD; 733 if (S->getParent() == 0) { 734 // C99 6.7.7p2: If a typedef name specifies a variably modified type 735 // then it shall have block scope. 736 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 737 // FIXME: Diagnostic needs to be fixed. 738 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 739 InvalidDecl = true; 740 } 741 } 742 } else if (R.getTypePtr()->isFunctionType()) { 743 FunctionDecl::StorageClass SC = FunctionDecl::None; 744 switch (D.getDeclSpec().getStorageClassSpec()) { 745 default: assert(0 && "Unknown storage class!"); 746 case DeclSpec::SCS_auto: 747 case DeclSpec::SCS_register: 748 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 749 R.getAsString()); 750 InvalidDecl = true; 751 break; 752 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 753 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 754 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 755 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 756 } 757 758 bool isInline = D.getDeclSpec().isInlineSpecified(); 759 FunctionDecl *NewFD = FunctionDecl::Create(Context, CurContext, 760 D.getIdentifierLoc(), 761 II, R, SC, isInline, 762 LastDeclarator); 763 // Handle attributes. 764 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 765 D.getAttributes()); 766 767 // Merge the decl with the existing one if appropriate. Since C functions 768 // are in a flat namespace, make sure we consider decls in outer scopes. 769 if (PrevDecl) { 770 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 771 if (NewFD == 0) return 0; 772 } 773 New = NewFD; 774 } else { 775 if (R.getTypePtr()->isObjCInterfaceType()) { 776 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 777 D.getIdentifier()->getName()); 778 InvalidDecl = true; 779 } 780 781 VarDecl *NewVD; 782 VarDecl::StorageClass SC; 783 switch (D.getDeclSpec().getStorageClassSpec()) { 784 default: assert(0 && "Unknown storage class!"); 785 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 786 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 787 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 788 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 789 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 790 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 791 } 792 if (S->getParent() == 0) { 793 // C99 6.9p2: The storage-class specifiers auto and register shall not 794 // appear in the declaration specifiers in an external declaration. 795 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 796 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 797 R.getAsString()); 798 InvalidDecl = true; 799 } 800 NewVD = FileVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 801 II, R, SC, 802 LastDeclarator); 803 } else { 804 NewVD = BlockVarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 805 II, R, SC, 806 LastDeclarator); 807 } 808 // Handle attributes prior to checking for duplicates in MergeVarDecl 809 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 810 D.getAttributes()); 811 812 // Emit an error if an address space was applied to decl with local storage. 813 // This includes arrays of objects with address space qualifiers, but not 814 // automatic variables that point to other address spaces. 815 // ISO/IEC TR 18037 S5.1.2 816 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 817 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 818 InvalidDecl = true; 819 } 820 // Merge the decl with the existing one if appropriate. If the decl is 821 // in an outer scope, it isn't the same thing. 822 if (PrevDecl && S->isDeclScope(PrevDecl)) { 823 NewVD = MergeVarDecl(NewVD, PrevDecl); 824 if (NewVD == 0) return 0; 825 } 826 New = NewVD; 827 } 828 829 // If this has an identifier, add it to the scope stack. 830 if (II) { 831 New->setNext(II->getFETokenInfo<ScopedDecl>()); 832 II->setFETokenInfo(New); 833 S->AddDecl(New); 834 } 835 // If any semantic error occurred, mark the decl as invalid. 836 if (D.getInvalidType() || InvalidDecl) 837 New->setInvalidDecl(); 838 839 return New; 840} 841 842bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 843 SourceLocation loc; 844 // FIXME: Remove the isReference check and handle assignment to a reference. 845 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 846 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 847 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 848 return true; 849 } 850 return false; 851} 852 853void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 854 Decl *RealDecl = static_cast<Decl *>(dcl); 855 Expr *Init = static_cast<Expr *>(init); 856 assert(Init && "missing initializer"); 857 858 // If there is no declaration, there was an error parsing it. Just ignore 859 // the initializer. 860 if (RealDecl == 0) { 861 delete Init; 862 return; 863 } 864 865 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 866 if (!VDecl) { 867 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 868 diag::err_illegal_initializer); 869 RealDecl->setInvalidDecl(); 870 return; 871 } 872 // Get the decls type and save a reference for later, since 873 // CheckInitializerTypes may change it. 874 QualType DclT = VDecl->getType(), SavT = DclT; 875 if (BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(VDecl)) { 876 VarDecl::StorageClass SC = BVD->getStorageClass(); 877 if (SC == VarDecl::Extern) { // C99 6.7.8p5 878 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 879 BVD->setInvalidDecl(); 880 } else if (!BVD->isInvalidDecl()) { 881 if (CheckInitializerTypes(Init, DclT)) 882 BVD->setInvalidDecl(); 883 if (SC == VarDecl::Static) // C99 6.7.8p4. 884 CheckForConstantInitializer(Init, DclT); 885 } 886 } else if (FileVarDecl *FVD = dyn_cast<FileVarDecl>(VDecl)) { 887 if (FVD->getStorageClass() == VarDecl::Extern) 888 Diag(VDecl->getLocation(), diag::warn_extern_init); 889 if (!FVD->isInvalidDecl()) 890 if (CheckInitializerTypes(Init, DclT)) 891 FVD->setInvalidDecl(); 892 893 // C99 6.7.8p4. All file scoped initializers need to be constant. 894 CheckForConstantInitializer(Init, DclT); 895 } 896 // If the type changed, it means we had an incomplete type that was 897 // completed by the initializer. For example: 898 // int ary[] = { 1, 3, 5 }; 899 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 900 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 901 VDecl->setType(DclT); 902 Init->setType(DclT); 903 } 904 905 // Attach the initializer to the decl. 906 VDecl->setInit(Init); 907 return; 908} 909 910/// The declarators are chained together backwards, reverse the list. 911Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 912 // Often we have single declarators, handle them quickly. 913 Decl *GroupDecl = static_cast<Decl*>(group); 914 if (GroupDecl == 0) 915 return 0; 916 917 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 918 ScopedDecl *NewGroup = 0; 919 if (Group->getNextDeclarator() == 0) 920 NewGroup = Group; 921 else { // reverse the list. 922 while (Group) { 923 ScopedDecl *Next = Group->getNextDeclarator(); 924 Group->setNextDeclarator(NewGroup); 925 NewGroup = Group; 926 Group = Next; 927 } 928 } 929 // Perform semantic analysis that depends on having fully processed both 930 // the declarator and initializer. 931 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 932 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 933 if (!IDecl) 934 continue; 935 FileVarDecl *FVD = dyn_cast<FileVarDecl>(IDecl); 936 BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(IDecl); 937 QualType T = IDecl->getType(); 938 939 // C99 6.7.5.2p2: If an identifier is declared to be an object with 940 // static storage duration, it shall not have a variable length array. 941 if ((FVD || BVD) && IDecl->getStorageClass() == VarDecl::Static) { 942 if (T->getAsVariableArrayType()) { 943 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 944 IDecl->setInvalidDecl(); 945 } 946 } 947 // Block scope. C99 6.7p7: If an identifier for an object is declared with 948 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 949 if (BVD && IDecl->getStorageClass() != VarDecl::Extern) { 950 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 951 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 952 T.getAsString()); 953 IDecl->setInvalidDecl(); 954 } 955 } 956 // File scope. C99 6.9.2p2: A declaration of an identifier for and 957 // object that has file scope without an initializer, and without a 958 // storage-class specifier or with the storage-class specifier "static", 959 // constitutes a tentative definition. Note: A tentative definition with 960 // external linkage is valid (C99 6.2.2p5). 961 if (FVD && !FVD->getInit() && (FVD->getStorageClass() == VarDecl::Static || 962 FVD->getStorageClass() == VarDecl::None)) { 963 if (T->isIncompleteArrayType()) { 964 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 965 // array to be completed. Don't issue a diagnostic. 966 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 967 // C99 6.9.2p3: If the declaration of an identifier for an object is 968 // a tentative definition and has internal linkage (C99 6.2.2p3), the 969 // declared type shall not be an incomplete type. 970 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 971 T.getAsString()); 972 IDecl->setInvalidDecl(); 973 } 974 } 975 } 976 return NewGroup; 977} 978 979// Called from Sema::ParseStartOfFunctionDef(). 980ParmVarDecl * 981Sema::ActOnParamDeclarator(struct DeclaratorChunk::ParamInfo &PI, 982 Scope *FnScope) { 983 IdentifierInfo *II = PI.Ident; 984 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 985 // Can this happen for params? We already checked that they don't conflict 986 // among each other. Here they can only shadow globals, which is ok. 987 if (/*Decl *PrevDecl = */LookupDecl(II, Decl::IDNS_Ordinary, FnScope)) { 988 989 } 990 991 // FIXME: Handle storage class (auto, register). No declarator? 992 // TODO: Chain to previous parameter with the prevdeclarator chain? 993 994 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 995 // Doing the promotion here has a win and a loss. The win is the type for 996 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 997 // code generator). The loss is the orginal type isn't preserved. For example: 998 // 999 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 1000 // int blockvardecl[5]; 1001 // sizeof(parmvardecl); // size == 4 1002 // sizeof(blockvardecl); // size == 20 1003 // } 1004 // 1005 // For expressions, all implicit conversions are captured using the 1006 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1007 // 1008 // FIXME: If a source translation tool needs to see the original type, then 1009 // we need to consider storing both types (in ParmVarDecl)... 1010 // 1011 QualType parmDeclType = QualType::getFromOpaquePtr(PI.TypeInfo); 1012 if (parmDeclType->isArrayType()) { 1013 // int x[restrict 4] -> int *restrict 1014 parmDeclType = Context.getArrayDecayedType(parmDeclType); 1015 } else if (parmDeclType->isFunctionType()) 1016 parmDeclType = Context.getPointerType(parmDeclType); 1017 1018 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, PI.IdentLoc, II, 1019 parmDeclType, 1020 VarDecl::None, 0); 1021 1022 if (PI.InvalidType) 1023 New->setInvalidDecl(); 1024 1025 // If this has an identifier, add it to the scope stack. 1026 if (II) { 1027 New->setNext(II->getFETokenInfo<ScopedDecl>()); 1028 II->setFETokenInfo(New); 1029 FnScope->AddDecl(New); 1030 } 1031 1032 HandleDeclAttributes(New, PI.AttrList, 0); 1033 return New; 1034} 1035 1036Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1037 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1038 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1039 "Not a function declarator!"); 1040 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1041 1042 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1043 // for a K&R function. 1044 if (!FTI.hasPrototype) { 1045 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1046 if (FTI.ArgInfo[i].TypeInfo == 0) { 1047 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1048 FTI.ArgInfo[i].Ident->getName()); 1049 // Implicitly declare the argument as type 'int' for lack of a better 1050 // type. 1051 FTI.ArgInfo[i].TypeInfo = Context.IntTy.getAsOpaquePtr(); 1052 } 1053 } 1054 1055 // Since this is a function definition, act as though we have information 1056 // about the arguments. 1057 if (FTI.NumArgs) 1058 FTI.hasPrototype = true; 1059 } else { 1060 // FIXME: Diagnose arguments without names in C. 1061 1062 } 1063 1064 Scope *GlobalScope = FnBodyScope->getParent(); 1065 1066 // See if this is a redefinition. 1067 Decl *PrevDcl = LookupDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1068 GlobalScope); 1069 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1070 if (FD->getBody()) { 1071 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1072 D.getIdentifier()->getName()); 1073 Diag(FD->getLocation(), diag::err_previous_definition); 1074 } 1075 } 1076 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1077 FunctionDecl *FD = cast<FunctionDecl>(decl); 1078 CurFunctionDecl = FD; 1079 PushContextDecl(FD); 1080 1081 // Create Decl objects for each parameter, adding them to the FunctionDecl. 1082 llvm::SmallVector<ParmVarDecl*, 16> Params; 1083 1084 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 1085 // no arguments, not a function that takes a single void argument. 1086 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1087 !QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo).getCVRQualifiers() && 1088 QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo)->isVoidType()) { 1089 // empty arg list, don't push any params. 1090 } else { 1091 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1092 ParmVarDecl *parmDecl; 1093 1094 parmDecl = ActOnParamDeclarator(D.getTypeObject(0).Fun.ArgInfo[i], 1095 FnBodyScope); 1096 // C99 6.7.5.3p4: the parameters in a parameter type list in a function 1097 // declarator that is part of a function definition of that function 1098 // shall not have incomplete type. 1099 if (parmDecl->getType()->isIncompleteType() && 1100 !parmDecl->isInvalidDecl()) { 1101 Diag(parmDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1102 parmDecl->getType().getAsString()); 1103 parmDecl->setInvalidDecl(); 1104 } 1105 Params.push_back(parmDecl); 1106 } 1107 } 1108 1109 FD->setParams(&Params[0], Params.size()); 1110 1111 return FD; 1112} 1113 1114Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1115 Decl *dcl = static_cast<Decl *>(D); 1116 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1117 FD->setBody((Stmt*)Body); 1118 assert(FD == CurFunctionDecl && "Function parsing confused"); 1119 CurFunctionDecl = 0; 1120 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1121 MD->setBody((Stmt*)Body); 1122 CurMethodDecl = 0; 1123 } 1124 PopContextDecl(); 1125 // Verify and clean out per-function state. 1126 1127 // Check goto/label use. 1128 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1129 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1130 // Verify that we have no forward references left. If so, there was a goto 1131 // or address of a label taken, but no definition of it. Label fwd 1132 // definitions are indicated with a null substmt. 1133 if (I->second->getSubStmt() == 0) { 1134 LabelStmt *L = I->second; 1135 // Emit error. 1136 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1137 1138 // At this point, we have gotos that use the bogus label. Stitch it into 1139 // the function body so that they aren't leaked and that the AST is well 1140 // formed. 1141 if (Body) { 1142 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1143 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1144 } else { 1145 // The whole function wasn't parsed correctly, just delete this. 1146 delete L; 1147 } 1148 } 1149 } 1150 LabelMap.clear(); 1151 1152 return D; 1153} 1154 1155/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1156/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1157ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1158 IdentifierInfo &II, Scope *S) { 1159 if (getLangOptions().C99) // Extension in C99. 1160 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1161 else // Legal in C90, but warn about it. 1162 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1163 1164 // FIXME: handle stuff like: 1165 // void foo() { extern float X(); } 1166 // void bar() { X(); } <-- implicit decl for X in another scope. 1167 1168 // Set a Declarator for the implicit definition: int foo(); 1169 const char *Dummy; 1170 DeclSpec DS; 1171 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1172 Error = Error; // Silence warning. 1173 assert(!Error && "Error setting up implicit decl!"); 1174 Declarator D(DS, Declarator::BlockContext); 1175 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1176 D.SetIdentifier(&II, Loc); 1177 1178 // Find translation-unit scope to insert this function into. 1179 if (Scope *FnS = S->getFnParent()) 1180 S = FnS->getParent(); // Skip all scopes in a function at once. 1181 while (S->getParent()) 1182 S = S->getParent(); 1183 1184 return dyn_cast<ScopedDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1185} 1186 1187 1188TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1189 ScopedDecl *LastDeclarator) { 1190 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1191 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1192 1193 // Scope manipulation handled by caller. 1194 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 1195 D.getIdentifierLoc(), 1196 D.getIdentifier(), 1197 T, LastDeclarator); 1198 if (D.getInvalidType()) 1199 NewTD->setInvalidDecl(); 1200 return NewTD; 1201} 1202 1203/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1204/// former case, Name will be non-null. In the later case, Name will be null. 1205/// TagType indicates what kind of tag this is. TK indicates whether this is a 1206/// reference/declaration/definition of a tag. 1207Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1208 SourceLocation KWLoc, IdentifierInfo *Name, 1209 SourceLocation NameLoc, AttributeList *Attr) { 1210 // If this is a use of an existing tag, it must have a name. 1211 assert((Name != 0 || TK == TK_Definition) && 1212 "Nameless record must be a definition!"); 1213 1214 Decl::Kind Kind; 1215 switch (TagType) { 1216 default: assert(0 && "Unknown tag type!"); 1217 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1218 case DeclSpec::TST_union: Kind = Decl::Union; break; 1219//case DeclSpec::TST_class: Kind = Decl::Class; break; 1220 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1221 } 1222 1223 // If this is a named struct, check to see if there was a previous forward 1224 // declaration or definition. 1225 if (TagDecl *PrevDecl = 1226 dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag, S))) { 1227 1228 // If this is a use of a previous tag, or if the tag is already declared in 1229 // the same scope (so that the definition/declaration completes or 1230 // rementions the tag), reuse the decl. 1231 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1232 // Make sure that this wasn't declared as an enum and now used as a struct 1233 // or something similar. 1234 if (PrevDecl->getKind() != Kind) { 1235 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1236 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1237 } 1238 1239 // If this is a use or a forward declaration, we're good. 1240 if (TK != TK_Definition) 1241 return PrevDecl; 1242 1243 // Diagnose attempts to redefine a tag. 1244 if (PrevDecl->isDefinition()) { 1245 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1246 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1247 // If this is a redefinition, recover by making this struct be 1248 // anonymous, which will make any later references get the previous 1249 // definition. 1250 Name = 0; 1251 } else { 1252 // Okay, this is definition of a previously declared or referenced tag. 1253 // Move the location of the decl to be the definition site. 1254 PrevDecl->setLocation(NameLoc); 1255 return PrevDecl; 1256 } 1257 } 1258 // If we get here, this is a definition of a new struct type in a nested 1259 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1260 // type. 1261 } 1262 1263 // If there is an identifier, use the location of the identifier as the 1264 // location of the decl, otherwise use the location of the struct/union 1265 // keyword. 1266 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1267 1268 // Otherwise, if this is the first time we've seen this tag, create the decl. 1269 TagDecl *New; 1270 switch (Kind) { 1271 default: assert(0 && "Unknown tag kind!"); 1272 case Decl::Enum: 1273 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1274 // enum X { A, B, C } D; D should chain to X. 1275 New = EnumDecl::Create(Context, CurContext, Loc, Name, 0); 1276 // If this is an undefined enum, warn. 1277 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1278 break; 1279 case Decl::Union: 1280 case Decl::Struct: 1281 case Decl::Class: 1282 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1283 // struct X { int A; } D; D should chain to X. 1284 New = RecordDecl::Create(Context, Kind, CurContext, Loc, Name, 0); 1285 break; 1286 } 1287 1288 // If this has an identifier, add it to the scope stack. 1289 if (Name) { 1290 // The scope passed in may not be a decl scope. Zip up the scope tree until 1291 // we find one that is. 1292 while ((S->getFlags() & Scope::DeclScope) == 0) 1293 S = S->getParent(); 1294 1295 // Add it to the decl chain. 1296 New->setNext(Name->getFETokenInfo<ScopedDecl>()); 1297 Name->setFETokenInfo(New); 1298 S->AddDecl(New); 1299 } 1300 1301 HandleDeclAttributes(New, Attr, 0); 1302 return New; 1303} 1304 1305/// ActOnField - Each field of a struct/union/class is passed into this in order 1306/// to create a FieldDecl object for it. 1307Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *tagDecl, 1308 SourceLocation DeclStart, 1309 Declarator &D, ExprTy *BitfieldWidth) { 1310 IdentifierInfo *II = D.getIdentifier(); 1311 Expr *BitWidth = (Expr*)BitfieldWidth; 1312 Decl *TagDecl = static_cast<Decl *>(tagDecl); 1313 SourceLocation Loc = DeclStart; 1314 if (II) Loc = D.getIdentifierLoc(); 1315 1316 // FIXME: Unnamed fields can be handled in various different ways, for 1317 // example, unnamed unions inject all members into the struct namespace! 1318 1319 1320 if (BitWidth) { 1321 // TODO: Validate. 1322 //printf("WARNING: BITFIELDS IGNORED!\n"); 1323 1324 // 6.7.2.1p3 1325 // 6.7.2.1p4 1326 1327 } else { 1328 // Not a bitfield. 1329 1330 // validate II. 1331 1332 } 1333 1334 QualType T = GetTypeForDeclarator(D, S); 1335 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1336 bool InvalidDecl = false; 1337 1338 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1339 // than a variably modified type. 1340 if (T->isVariablyModifiedType()) { 1341 // FIXME: This diagnostic needs work 1342 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1343 InvalidDecl = true; 1344 } 1345 // FIXME: Chain fielddecls together. 1346 FieldDecl *NewFD; 1347 1348 if (RecordDecl *RD = dyn_cast<RecordDecl>(TagDecl)) 1349 NewFD = FieldDecl::Create(Context, RD, Loc, II, T, BitWidth); 1350 else if (isa<ObjCInterfaceDecl>(TagDecl) || 1351 isa<ObjCImplementationDecl>(TagDecl) || 1352 isa<ObjCCategoryDecl>(TagDecl) || 1353 // FIXME: ivars are currently used to model properties, and 1354 // properties can appear within a protocol. 1355 // See corresponding FIXME in DeclObjC.h:ObjCPropertyDecl. 1356 isa<ObjCProtocolDecl>(TagDecl)) 1357 NewFD = ObjCIvarDecl::Create(Context, dyn_cast<ObjCInterfaceDecl>(TagDecl), Loc, II, T); 1358 else 1359 assert(0 && "Sema::ActOnField(): Unknown TagDecl"); 1360 1361 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1362 D.getAttributes()); 1363 1364 if (D.getInvalidType() || InvalidDecl) 1365 NewFD->setInvalidDecl(); 1366 return NewFD; 1367} 1368 1369/// TranslateIvarVisibility - Translate visibility from a token ID to an 1370/// AST enum value. 1371static ObjCIvarDecl::AccessControl 1372TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1373 switch (ivarVisibility) { 1374 case tok::objc_private: return ObjCIvarDecl::Private; 1375 case tok::objc_public: return ObjCIvarDecl::Public; 1376 case tok::objc_protected: return ObjCIvarDecl::Protected; 1377 case tok::objc_package: return ObjCIvarDecl::Package; 1378 default: assert(false && "Unknown visitibility kind"); 1379 } 1380} 1381 1382void Sema::ActOnFields(Scope* S, 1383 SourceLocation RecLoc, DeclTy *RecDecl, 1384 DeclTy **Fields, unsigned NumFields, 1385 SourceLocation LBrac, SourceLocation RBrac, 1386 tok::ObjCKeywordKind *visibility) { 1387 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1388 assert(EnclosingDecl && "missing record or interface decl"); 1389 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1390 1391 if (Record && Record->isDefinition()) { 1392 // Diagnose code like: 1393 // struct S { struct S {} X; }; 1394 // We discover this when we complete the outer S. Reject and ignore the 1395 // outer S. 1396 Diag(Record->getLocation(), diag::err_nested_redefinition, 1397 Record->getKindName()); 1398 Diag(RecLoc, diag::err_previous_definition); 1399 Record->setInvalidDecl(); 1400 return; 1401 } 1402 // Verify that all the fields are okay. 1403 unsigned NumNamedMembers = 0; 1404 llvm::SmallVector<FieldDecl*, 32> RecFields; 1405 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1406 1407 for (unsigned i = 0; i != NumFields; ++i) { 1408 1409 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1410 assert(FD && "missing field decl"); 1411 1412 // Remember all fields. 1413 RecFields.push_back(FD); 1414 1415 // Get the type for the field. 1416 Type *FDTy = FD->getType().getTypePtr(); 1417 1418 // If we have visibility info, make sure the AST is set accordingly. 1419 if (visibility) 1420 cast<ObjCIvarDecl>(FD)->setAccessControl( 1421 TranslateIvarVisibility(visibility[i])); 1422 1423 // C99 6.7.2.1p2 - A field may not be a function type. 1424 if (FDTy->isFunctionType()) { 1425 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1426 FD->getName()); 1427 FD->setInvalidDecl(); 1428 EnclosingDecl->setInvalidDecl(); 1429 continue; 1430 } 1431 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1432 if (FDTy->isIncompleteType()) { 1433 if (!Record) { // Incomplete ivar type is always an error. 1434 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1435 FD->setInvalidDecl(); 1436 EnclosingDecl->setInvalidDecl(); 1437 continue; 1438 } 1439 if (i != NumFields-1 || // ... that the last member ... 1440 Record->getKind() != Decl::Struct || // ... of a structure ... 1441 !FDTy->isArrayType()) { //... may have incomplete array type. 1442 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1443 FD->setInvalidDecl(); 1444 EnclosingDecl->setInvalidDecl(); 1445 continue; 1446 } 1447 if (NumNamedMembers < 1) { //... must have more than named member ... 1448 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1449 FD->getName()); 1450 FD->setInvalidDecl(); 1451 EnclosingDecl->setInvalidDecl(); 1452 continue; 1453 } 1454 // Okay, we have a legal flexible array member at the end of the struct. 1455 if (Record) 1456 Record->setHasFlexibleArrayMember(true); 1457 } 1458 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1459 /// field of another structure or the element of an array. 1460 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1461 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1462 // If this is a member of a union, then entire union becomes "flexible". 1463 if (Record && Record->getKind() == Decl::Union) { 1464 Record->setHasFlexibleArrayMember(true); 1465 } else { 1466 // If this is a struct/class and this is not the last element, reject 1467 // it. Note that GCC supports variable sized arrays in the middle of 1468 // structures. 1469 if (i != NumFields-1) { 1470 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1471 FD->getName()); 1472 FD->setInvalidDecl(); 1473 EnclosingDecl->setInvalidDecl(); 1474 continue; 1475 } 1476 // We support flexible arrays at the end of structs in other structs 1477 // as an extension. 1478 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1479 FD->getName()); 1480 if (Record) 1481 Record->setHasFlexibleArrayMember(true); 1482 } 1483 } 1484 } 1485 /// A field cannot be an Objective-c object 1486 if (FDTy->isObjCInterfaceType()) { 1487 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1488 FD->getName()); 1489 FD->setInvalidDecl(); 1490 EnclosingDecl->setInvalidDecl(); 1491 continue; 1492 } 1493 // Keep track of the number of named members. 1494 if (IdentifierInfo *II = FD->getIdentifier()) { 1495 // Detect duplicate member names. 1496 if (!FieldIDs.insert(II)) { 1497 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1498 // Find the previous decl. 1499 SourceLocation PrevLoc; 1500 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1501 assert(i != e && "Didn't find previous def!"); 1502 if (RecFields[i]->getIdentifier() == II) { 1503 PrevLoc = RecFields[i]->getLocation(); 1504 break; 1505 } 1506 } 1507 Diag(PrevLoc, diag::err_previous_definition); 1508 FD->setInvalidDecl(); 1509 EnclosingDecl->setInvalidDecl(); 1510 continue; 1511 } 1512 ++NumNamedMembers; 1513 } 1514 } 1515 1516 // Okay, we successfully defined 'Record'. 1517 if (Record) { 1518 Record->defineBody(&RecFields[0], RecFields.size()); 1519 Consumer.HandleTagDeclDefinition(Record); 1520 } else { 1521 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1522 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1523 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1524 else if (ObjCImplementationDecl *IMPDecl = 1525 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1526 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1527 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1528 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1529 } 1530 } 1531} 1532 1533Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1534 DeclTy *lastEnumConst, 1535 SourceLocation IdLoc, IdentifierInfo *Id, 1536 SourceLocation EqualLoc, ExprTy *val) { 1537 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 1538 EnumConstantDecl *LastEnumConst = 1539 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1540 Expr *Val = static_cast<Expr*>(val); 1541 1542 // The scope passed in may not be a decl scope. Zip up the scope tree until 1543 // we find one that is. 1544 while ((S->getFlags() & Scope::DeclScope) == 0) 1545 S = S->getParent(); 1546 1547 // Verify that there isn't already something declared with this name in this 1548 // scope. 1549 if (Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S)) { 1550 if (S->isDeclScope(PrevDecl)) { 1551 if (isa<EnumConstantDecl>(PrevDecl)) 1552 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1553 else 1554 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1555 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1556 delete Val; 1557 return 0; 1558 } 1559 } 1560 1561 llvm::APSInt EnumVal(32); 1562 QualType EltTy; 1563 if (Val) { 1564 // Make sure to promote the operand type to int. 1565 UsualUnaryConversions(Val); 1566 1567 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1568 SourceLocation ExpLoc; 1569 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1570 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1571 Id->getName()); 1572 delete Val; 1573 Val = 0; // Just forget about it. 1574 } else { 1575 EltTy = Val->getType(); 1576 } 1577 } 1578 1579 if (!Val) { 1580 if (LastEnumConst) { 1581 // Assign the last value + 1. 1582 EnumVal = LastEnumConst->getInitVal(); 1583 ++EnumVal; 1584 1585 // Check for overflow on increment. 1586 if (EnumVal < LastEnumConst->getInitVal()) 1587 Diag(IdLoc, diag::warn_enum_value_overflow); 1588 1589 EltTy = LastEnumConst->getType(); 1590 } else { 1591 // First value, set to zero. 1592 EltTy = Context.IntTy; 1593 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1594 } 1595 } 1596 1597 EnumConstantDecl *New = 1598 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 1599 Val, EnumVal, 1600 LastEnumConst); 1601 1602 // Register this decl in the current scope stack. 1603 New->setNext(Id->getFETokenInfo<ScopedDecl>()); 1604 Id->setFETokenInfo(New); 1605 S->AddDecl(New); 1606 return New; 1607} 1608 1609void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1610 DeclTy **Elements, unsigned NumElements) { 1611 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1612 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1613 1614 // TODO: If the result value doesn't fit in an int, it must be a long or long 1615 // long value. ISO C does not support this, but GCC does as an extension, 1616 // emit a warning. 1617 unsigned IntWidth = Context.Target.getIntWidth(); 1618 1619 // Verify that all the values are okay, compute the size of the values, and 1620 // reverse the list. 1621 unsigned NumNegativeBits = 0; 1622 unsigned NumPositiveBits = 0; 1623 1624 // Keep track of whether all elements have type int. 1625 bool AllElementsInt = true; 1626 1627 EnumConstantDecl *EltList = 0; 1628 for (unsigned i = 0; i != NumElements; ++i) { 1629 EnumConstantDecl *ECD = 1630 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1631 if (!ECD) continue; // Already issued a diagnostic. 1632 1633 // If the enum value doesn't fit in an int, emit an extension warning. 1634 const llvm::APSInt &InitVal = ECD->getInitVal(); 1635 assert(InitVal.getBitWidth() >= IntWidth && 1636 "Should have promoted value to int"); 1637 if (InitVal.getBitWidth() > IntWidth) { 1638 llvm::APSInt V(InitVal); 1639 V.trunc(IntWidth); 1640 V.extend(InitVal.getBitWidth()); 1641 if (V != InitVal) 1642 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1643 InitVal.toString()); 1644 } 1645 1646 // Keep track of the size of positive and negative values. 1647 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1648 NumPositiveBits = std::max(NumPositiveBits, 1649 (unsigned)InitVal.getActiveBits()); 1650 else 1651 NumNegativeBits = std::max(NumNegativeBits, 1652 (unsigned)InitVal.getMinSignedBits()); 1653 1654 // Keep track of whether every enum element has type int (very commmon). 1655 if (AllElementsInt) 1656 AllElementsInt = ECD->getType() == Context.IntTy; 1657 1658 ECD->setNextDeclarator(EltList); 1659 EltList = ECD; 1660 } 1661 1662 // Figure out the type that should be used for this enum. 1663 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1664 QualType BestType; 1665 unsigned BestWidth; 1666 1667 if (NumNegativeBits) { 1668 // If there is a negative value, figure out the smallest integer type (of 1669 // int/long/longlong) that fits. 1670 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1671 BestType = Context.IntTy; 1672 BestWidth = IntWidth; 1673 } else { 1674 BestWidth = Context.Target.getLongWidth(); 1675 1676 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1677 BestType = Context.LongTy; 1678 else { 1679 BestWidth = Context.Target.getLongLongWidth(); 1680 1681 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1682 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1683 BestType = Context.LongLongTy; 1684 } 1685 } 1686 } else { 1687 // If there is no negative value, figure out which of uint, ulong, ulonglong 1688 // fits. 1689 if (NumPositiveBits <= IntWidth) { 1690 BestType = Context.UnsignedIntTy; 1691 BestWidth = IntWidth; 1692 } else if (NumPositiveBits <= 1693 (BestWidth = Context.Target.getLongWidth())) { 1694 BestType = Context.UnsignedLongTy; 1695 } else { 1696 BestWidth = Context.Target.getLongLongWidth(); 1697 assert(NumPositiveBits <= BestWidth && 1698 "How could an initializer get larger than ULL?"); 1699 BestType = Context.UnsignedLongLongTy; 1700 } 1701 } 1702 1703 // Loop over all of the enumerator constants, changing their types to match 1704 // the type of the enum if needed. 1705 for (unsigned i = 0; i != NumElements; ++i) { 1706 EnumConstantDecl *ECD = 1707 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1708 if (!ECD) continue; // Already issued a diagnostic. 1709 1710 // Standard C says the enumerators have int type, but we allow, as an 1711 // extension, the enumerators to be larger than int size. If each 1712 // enumerator value fits in an int, type it as an int, otherwise type it the 1713 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1714 // that X has type 'int', not 'unsigned'. 1715 if (ECD->getType() == Context.IntTy) { 1716 // Make sure the init value is signed. 1717 llvm::APSInt IV = ECD->getInitVal(); 1718 IV.setIsSigned(true); 1719 ECD->setInitVal(IV); 1720 continue; // Already int type. 1721 } 1722 1723 // Determine whether the value fits into an int. 1724 llvm::APSInt InitVal = ECD->getInitVal(); 1725 bool FitsInInt; 1726 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1727 FitsInInt = InitVal.getActiveBits() < IntWidth; 1728 else 1729 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1730 1731 // If it fits into an integer type, force it. Otherwise force it to match 1732 // the enum decl type. 1733 QualType NewTy; 1734 unsigned NewWidth; 1735 bool NewSign; 1736 if (FitsInInt) { 1737 NewTy = Context.IntTy; 1738 NewWidth = IntWidth; 1739 NewSign = true; 1740 } else if (ECD->getType() == BestType) { 1741 // Already the right type! 1742 continue; 1743 } else { 1744 NewTy = BestType; 1745 NewWidth = BestWidth; 1746 NewSign = BestType->isSignedIntegerType(); 1747 } 1748 1749 // Adjust the APSInt value. 1750 InitVal.extOrTrunc(NewWidth); 1751 InitVal.setIsSigned(NewSign); 1752 ECD->setInitVal(InitVal); 1753 1754 // Adjust the Expr initializer and type. 1755 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1756 ECD->setType(NewTy); 1757 } 1758 1759 Enum->defineElements(EltList, BestType); 1760 Consumer.HandleTagDeclDefinition(Enum); 1761} 1762 1763Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1764 ExprTy *expr) { 1765 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1766 1767 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1768} 1769 1770Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1771 SourceLocation LBrace, 1772 SourceLocation RBrace, 1773 const char *Lang, 1774 unsigned StrSize, 1775 DeclTy *D) { 1776 LinkageSpecDecl::LanguageIDs Language; 1777 Decl *dcl = static_cast<Decl *>(D); 1778 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1779 Language = LinkageSpecDecl::lang_c; 1780 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1781 Language = LinkageSpecDecl::lang_cxx; 1782 else { 1783 Diag(Loc, diag::err_bad_language); 1784 return 0; 1785 } 1786 1787 // FIXME: Add all the various semantics of linkage specifications 1788 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1789} 1790 1791void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1792 1793 switch (Attr->getKind()) { 1794 case AttributeList::AT_vector_size: 1795 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1796 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1797 if (!newType.isNull()) // install the new vector type into the decl 1798 vDecl->setType(newType); 1799 } 1800 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1801 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1802 Attr); 1803 if (!newType.isNull()) // install the new vector type into the decl 1804 tDecl->setUnderlyingType(newType); 1805 } 1806 break; 1807 case AttributeList::AT_ocu_vector_type: 1808 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1809 HandleOCUVectorTypeAttribute(tDecl, Attr); 1810 else 1811 Diag(Attr->getLoc(), 1812 diag::err_typecheck_ocu_vector_not_typedef); 1813 break; 1814 case AttributeList::AT_address_space: 1815 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1816 QualType newType = HandleAddressSpaceTypeAttribute( 1817 tDecl->getUnderlyingType(), 1818 Attr); 1819 tDecl->setUnderlyingType(newType); 1820 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1821 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1822 Attr); 1823 // install the new addr spaced type into the decl 1824 vDecl->setType(newType); 1825 } 1826 break; 1827 case AttributeList::AT_deprecated: 1828 HandleDeprecatedAttribute(New, Attr); 1829 break; 1830 case AttributeList::AT_visibility: 1831 HandleVisibilityAttribute(New, Attr); 1832 break; 1833 case AttributeList::AT_weak: 1834 HandleWeakAttribute(New, Attr); 1835 break; 1836 case AttributeList::AT_dllimport: 1837 HandleDLLImportAttribute(New, Attr); 1838 break; 1839 case AttributeList::AT_dllexport: 1840 HandleDLLExportAttribute(New, Attr); 1841 break; 1842 case AttributeList::AT_nothrow: 1843 HandleNothrowAttribute(New, Attr); 1844 break; 1845 case AttributeList::AT_stdcall: 1846 HandleStdCallAttribute(New, Attr); 1847 break; 1848 case AttributeList::AT_fastcall: 1849 HandleFastCallAttribute(New, Attr); 1850 break; 1851 case AttributeList::AT_aligned: 1852 HandleAlignedAttribute(New, Attr); 1853 break; 1854 case AttributeList::AT_packed: 1855 HandlePackedAttribute(New, Attr); 1856 break; 1857 case AttributeList::AT_annotate: 1858 HandleAnnotateAttribute(New, Attr); 1859 break; 1860 case AttributeList::AT_noreturn: 1861 HandleNoReturnAttribute(New, Attr); 1862 break; 1863 case AttributeList::AT_format: 1864 HandleFormatAttribute(New, Attr); 1865 break; 1866 default: 1867#if 0 1868 // TODO: when we have the full set of attributes, warn about unknown ones. 1869 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1870 Attr->getName()->getName()); 1871#endif 1872 break; 1873 } 1874} 1875 1876void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 1877 AttributeList *declarator_postfix) { 1878 while (declspec_prefix) { 1879 HandleDeclAttribute(New, declspec_prefix); 1880 declspec_prefix = declspec_prefix->getNext(); 1881 } 1882 while (declarator_postfix) { 1883 HandleDeclAttribute(New, declarator_postfix); 1884 declarator_postfix = declarator_postfix->getNext(); 1885 } 1886} 1887 1888void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 1889 AttributeList *rawAttr) { 1890 QualType curType = tDecl->getUnderlyingType(); 1891 // check the attribute arguments. 1892 if (rawAttr->getNumArgs() != 1) { 1893 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1894 std::string("1")); 1895 return; 1896 } 1897 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1898 llvm::APSInt vecSize(32); 1899 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1900 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1901 "ocu_vector_type", sizeExpr->getSourceRange()); 1902 return; 1903 } 1904 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1905 // in conjunction with complex types (pointers, arrays, functions, etc.). 1906 Type *canonType = curType.getCanonicalType().getTypePtr(); 1907 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1908 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1909 curType.getCanonicalType().getAsString()); 1910 return; 1911 } 1912 // unlike gcc's vector_size attribute, the size is specified as the 1913 // number of elements, not the number of bytes. 1914 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1915 1916 if (vectorSize == 0) { 1917 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1918 sizeExpr->getSourceRange()); 1919 return; 1920 } 1921 // Instantiate/Install the vector type, the number of elements is > 0. 1922 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 1923 // Remember this typedef decl, we will need it later for diagnostics. 1924 OCUVectorDecls.push_back(tDecl); 1925} 1926 1927QualType Sema::HandleVectorTypeAttribute(QualType curType, 1928 AttributeList *rawAttr) { 1929 // check the attribute arugments. 1930 if (rawAttr->getNumArgs() != 1) { 1931 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1932 std::string("1")); 1933 return QualType(); 1934 } 1935 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1936 llvm::APSInt vecSize(32); 1937 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1938 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1939 "vector_size", sizeExpr->getSourceRange()); 1940 return QualType(); 1941 } 1942 // navigate to the base type - we need to provide for vector pointers, 1943 // vector arrays, and functions returning vectors. 1944 Type *canonType = curType.getCanonicalType().getTypePtr(); 1945 1946 if (canonType->isPointerType() || canonType->isArrayType() || 1947 canonType->isFunctionType()) { 1948 assert(0 && "HandleVector(): Complex type construction unimplemented"); 1949 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 1950 do { 1951 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 1952 canonType = PT->getPointeeType().getTypePtr(); 1953 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 1954 canonType = AT->getElementType().getTypePtr(); 1955 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 1956 canonType = FT->getResultType().getTypePtr(); 1957 } while (canonType->isPointerType() || canonType->isArrayType() || 1958 canonType->isFunctionType()); 1959 */ 1960 } 1961 // the base type must be integer or float. 1962 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1963 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1964 curType.getCanonicalType().getAsString()); 1965 return QualType(); 1966 } 1967 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 1968 // vecSize is specified in bytes - convert to bits. 1969 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1970 1971 // the vector size needs to be an integral multiple of the type size. 1972 if (vectorSize % typeSize) { 1973 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 1974 sizeExpr->getSourceRange()); 1975 return QualType(); 1976 } 1977 if (vectorSize == 0) { 1978 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1979 sizeExpr->getSourceRange()); 1980 return QualType(); 1981 } 1982 // Instantiate the vector type, the number of elements is > 0, and not 1983 // required to be a power of 2, unlike GCC. 1984 return Context.getVectorType(curType, vectorSize/typeSize); 1985} 1986 1987void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 1988 // check the attribute arguments. 1989 if (rawAttr->getNumArgs() > 0) { 1990 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1991 std::string("0")); 1992 return; 1993 } 1994 1995 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 1996 TD->addAttr(new PackedAttr); 1997 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 1998 // If the alignment is less than or equal to 8 bits, the packed attribute 1999 // has no effect. 2000 if (Context.getTypeAlign(FD->getType()) <= 8) 2001 Diag(rawAttr->getLoc(), 2002 diag::warn_attribute_ignored_for_field_of_type, 2003 rawAttr->getName()->getName(), FD->getType().getAsString()); 2004 else 2005 FD->addAttr(new PackedAttr); 2006 } else 2007 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2008 rawAttr->getName()->getName()); 2009} 2010 2011void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2012 // check the attribute arguments. 2013 if (rawAttr->getNumArgs() != 0) { 2014 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2015 std::string("0")); 2016 return; 2017 } 2018 2019 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2020 2021 if (!Fn) { 2022 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2023 "noreturn", "function"); 2024 return; 2025 } 2026 2027 d->addAttr(new NoReturnAttr()); 2028} 2029 2030void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2031 // check the attribute arguments. 2032 if (rawAttr->getNumArgs() != 0) { 2033 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2034 std::string("0")); 2035 return; 2036 } 2037 2038 d->addAttr(new DeprecatedAttr()); 2039} 2040 2041void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2042 // check the attribute arguments. 2043 if (rawAttr->getNumArgs() != 1) { 2044 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2045 std::string("1")); 2046 return; 2047 } 2048 2049 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2050 Arg = Arg->IgnoreParenCasts(); 2051 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2052 2053 if (Str == 0 || Str->isWide()) { 2054 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2055 "visibility", std::string("1")); 2056 return; 2057 } 2058 2059 const char *TypeStr = Str->getStrData(); 2060 unsigned TypeLen = Str->getByteLength(); 2061 llvm::GlobalValue::VisibilityTypes type; 2062 2063 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2064 type = llvm::GlobalValue::DefaultVisibility; 2065 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2066 type = llvm::GlobalValue::HiddenVisibility; 2067 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2068 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2069 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2070 type = llvm::GlobalValue::ProtectedVisibility; 2071 else { 2072 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2073 "visibility", TypeStr); 2074 return; 2075 } 2076 2077 d->addAttr(new VisibilityAttr(type)); 2078} 2079 2080void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2081 // check the attribute arguments. 2082 if (rawAttr->getNumArgs() != 0) { 2083 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2084 std::string("0")); 2085 return; 2086 } 2087 2088 d->addAttr(new WeakAttr()); 2089} 2090 2091void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2092 // check the attribute arguments. 2093 if (rawAttr->getNumArgs() != 0) { 2094 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2095 std::string("0")); 2096 return; 2097 } 2098 2099 d->addAttr(new DLLImportAttr()); 2100} 2101 2102void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2103 // check the attribute arguments. 2104 if (rawAttr->getNumArgs() != 0) { 2105 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2106 std::string("0")); 2107 return; 2108 } 2109 2110 d->addAttr(new DLLExportAttr()); 2111} 2112 2113void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2114 // check the attribute arguments. 2115 if (rawAttr->getNumArgs() != 0) { 2116 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2117 std::string("0")); 2118 return; 2119 } 2120 2121 d->addAttr(new StdCallAttr()); 2122} 2123 2124void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2125 // check the attribute arguments. 2126 if (rawAttr->getNumArgs() != 0) { 2127 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2128 std::string("0")); 2129 return; 2130 } 2131 2132 d->addAttr(new FastCallAttr()); 2133} 2134 2135void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2136 // check the attribute arguments. 2137 if (rawAttr->getNumArgs() != 0) { 2138 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2139 std::string("0")); 2140 return; 2141 } 2142 2143 d->addAttr(new NoThrowAttr()); 2144} 2145 2146static const FunctionTypeProto *getFunctionProto(Decl *d) { 2147 ValueDecl *decl = dyn_cast<ValueDecl>(d); 2148 if (!decl) return 0; 2149 2150 QualType Ty = decl->getType(); 2151 2152 if (Ty->isFunctionPointerType()) { 2153 const PointerType *PtrTy = Ty->getAsPointerType(); 2154 Ty = PtrTy->getPointeeType(); 2155 } 2156 2157 if (const FunctionType *FnTy = Ty->getAsFunctionType()) 2158 return dyn_cast<FunctionTypeProto>(FnTy->getAsFunctionType()); 2159 2160 return 0; 2161} 2162 2163 2164/// Handle __attribute__((format(type,idx,firstarg))) attributes 2165/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2166void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2167 2168 if (!rawAttr->getParameterName()) { 2169 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2170 "format", std::string("1")); 2171 return; 2172 } 2173 2174 if (rawAttr->getNumArgs() != 2) { 2175 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2176 std::string("3")); 2177 return; 2178 } 2179 2180 // GCC ignores the format attribute on K&R style function 2181 // prototypes, so we ignore it as well 2182 const FunctionTypeProto *proto = getFunctionProto(d); 2183 2184 if (!proto) { 2185 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2186 "format", "function"); 2187 return; 2188 } 2189 2190 // FIXME: in C++ the implicit 'this' function parameter also counts. 2191 // this is needed in order to be compatible with GCC 2192 // the index must start in 1 and the limit is numargs+1 2193 unsigned NumArgs = proto->getNumArgs(); 2194 unsigned FirstIdx = 1; 2195 2196 const char *Format = rawAttr->getParameterName()->getName(); 2197 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2198 2199 // Normalize the argument, __foo__ becomes foo. 2200 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2201 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2202 Format += 2; 2203 FormatLen -= 4; 2204 } 2205 2206 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2207 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2208 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2209 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2210 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2211 "format", rawAttr->getParameterName()->getName()); 2212 return; 2213 } 2214 2215 // checks for the 2nd argument 2216 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2217 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2218 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2219 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2220 "format", std::string("2"), IdxExpr->getSourceRange()); 2221 return; 2222 } 2223 2224 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2225 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2226 "format", std::string("2"), IdxExpr->getSourceRange()); 2227 return; 2228 } 2229 2230 // make sure the format string is really a string 2231 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2232 if (!Ty->isPointerType() || 2233 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2234 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2235 IdxExpr->getSourceRange()); 2236 return; 2237 } 2238 2239 2240 // check the 3rd argument 2241 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2242 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2243 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2244 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2245 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2246 return; 2247 } 2248 2249 // check if the function is variadic if the 3rd argument non-zero 2250 if (FirstArg != 0) { 2251 if (proto->isVariadic()) { 2252 ++NumArgs; // +1 for ... 2253 } else { 2254 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2255 return; 2256 } 2257 } 2258 2259 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2260 // the input is just the current time + the format string 2261 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2262 if (FirstArg != 0) { 2263 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2264 FirstArgExpr->getSourceRange()); 2265 return; 2266 } 2267 // if 0 it disables parameter checking (to use with e.g. va_list) 2268 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2269 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2270 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2271 return; 2272 } 2273 2274 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2275 Idx.getZExtValue(), FirstArg.getZExtValue())); 2276} 2277 2278void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2279 // check the attribute arguments. 2280 if (rawAttr->getNumArgs() != 1) { 2281 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2282 std::string("1")); 2283 return; 2284 } 2285 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2286 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2287 2288 // Make sure that there is a string literal as the annotation's single 2289 // argument. 2290 if (!SE) { 2291 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2292 return; 2293 } 2294 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2295 SE->getByteLength()))); 2296} 2297 2298void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2299{ 2300 // check the attribute arguments. 2301 if (rawAttr->getNumArgs() > 1) { 2302 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2303 std::string("1")); 2304 return; 2305 } 2306 2307 unsigned Align = 0; 2308 2309 if (rawAttr->getNumArgs() == 0) { 2310 // FIXME: This should be the target specific maximum alignment. 2311 // (For now we just use 128 bits which is the maximum on X86. 2312 Align = 128; 2313 return; 2314 } else { 2315 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2316 llvm::APSInt alignment(32); 2317 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2318 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2319 "aligned", alignmentExpr->getSourceRange()); 2320 return; 2321 } 2322 2323 Align = alignment.getZExtValue() * 8; 2324 } 2325 2326 d->addAttr(new AlignedAttr(Align)); 2327} 2328