SemaDecl.cpp revision 8e7dafec4b70303dfaff95151cd06bfc5532720c
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) const { 36 Decl *IIDecl = II.getFETokenInfo<Decl>(); 37 // Find first occurance of none-tagged declaration 38 while(IIDecl && IIDecl->getIdentifierNamespace() != Decl::IDNS_Ordinary) 39 IIDecl = cast<ScopedDecl>(IIDecl)->getNext(); 40 if (!IIDecl) 41 return 0; 42 if (isa<TypedefDecl>(IIDecl) || isa<ObjCInterfaceDecl>(IIDecl)) 43 return IIDecl; 44 if (ObjCCompatibleAliasDecl *ADecl = 45 dyn_cast<ObjCCompatibleAliasDecl>(IIDecl)) 46 return ADecl->getClassInterface(); 47 return 0; 48} 49 50void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 51 if (S->decl_empty()) return; 52 assert((S->getFlags() & Scope::DeclScope) &&"Scope shouldn't contain decls!"); 53 54 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 55 I != E; ++I) { 56 Decl *TmpD = static_cast<Decl*>(*I); 57 assert(TmpD && "This decl didn't get pushed??"); 58 ScopedDecl *D = dyn_cast<ScopedDecl>(TmpD); 59 assert(D && "This decl isn't a ScopedDecl?"); 60 61 IdentifierInfo *II = D->getIdentifier(); 62 if (!II) continue; 63 64 // Unlink this decl from the identifier. Because the scope contains decls 65 // in an unordered collection, and because we have multiple identifier 66 // namespaces (e.g. tag, normal, label),the decl may not be the first entry. 67 if (II->getFETokenInfo<Decl>() == D) { 68 // Normal case, no multiple decls in different namespaces. 69 II->setFETokenInfo(D->getNext()); 70 } else { 71 // Scan ahead. There are only three namespaces in C, so this loop can 72 // never execute more than 3 times. 73 ScopedDecl *SomeDecl = II->getFETokenInfo<ScopedDecl>(); 74 while (SomeDecl->getNext() != D) { 75 SomeDecl = SomeDecl->getNext(); 76 assert(SomeDecl && "Didn't find this decl on its identifier's chain!"); 77 } 78 SomeDecl->setNext(D->getNext()); 79 } 80 81 // This will have to be revisited for C++: there we want to nest stuff in 82 // namespace decls etc. Even for C, we might want a top-level translation 83 // unit decl or something. 84 if (!CurFunctionDecl) 85 continue; 86 87 // Chain this decl to the containing function, it now owns the memory for 88 // the decl. 89 D->setNext(CurFunctionDecl->getDeclChain()); 90 CurFunctionDecl->setDeclChain(D); 91 } 92} 93 94/// LookupInterfaceDecl - Lookup interface declaration in the scope chain. 95/// Return the first declaration found (which may or may not be a class 96/// declaration. Caller is responsible for handling the none-class case. 97/// Bypassing the alias of a class by returning the aliased class. 98ScopedDecl *Sema::LookupInterfaceDecl(IdentifierInfo *ClassName) { 99 ScopedDecl *IDecl; 100 // Scan up the scope chain looking for a decl that matches this identifier 101 // that is in the appropriate namespace. 102 for (IDecl = ClassName->getFETokenInfo<ScopedDecl>(); IDecl; 103 IDecl = IDecl->getNext()) 104 if (IDecl->getIdentifierNamespace() == Decl::IDNS_Ordinary) 105 break; 106 107 if (ObjCCompatibleAliasDecl *ADecl = 108 dyn_cast_or_null<ObjCCompatibleAliasDecl>(IDecl)) 109 return ADecl->getClassInterface(); 110 return IDecl; 111} 112 113/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 114/// return 0 if one not found. 115ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 116 ScopedDecl *IdDecl = LookupInterfaceDecl(Id); 117 return cast_or_null<ObjCInterfaceDecl>(IdDecl); 118} 119 120/// LookupScopedDecl - Look up the inner-most declaration in the specified 121/// namespace. 122ScopedDecl *Sema::LookupScopedDecl(IdentifierInfo *II, unsigned NSI, 123 SourceLocation IdLoc, Scope *S) { 124 if (II == 0) return 0; 125 Decl::IdentifierNamespace NS = (Decl::IdentifierNamespace)NSI; 126 127 // Scan up the scope chain looking for a decl that matches this identifier 128 // that is in the appropriate namespace. This search should not take long, as 129 // shadowing of names is uncommon, and deep shadowing is extremely uncommon. 130 for (ScopedDecl *D = II->getFETokenInfo<ScopedDecl>(); D; D = D->getNext()) 131 if (D->getIdentifierNamespace() == NS) 132 return D; 133 134 // If we didn't find a use of this identifier, and if the identifier 135 // corresponds to a compiler builtin, create the decl object for the builtin 136 // now, injecting it into translation unit scope, and return it. 137 if (NS == Decl::IDNS_Ordinary) { 138 // If this is a builtin on this (or all) targets, create the decl. 139 if (unsigned BuiltinID = II->getBuiltinID()) 140 return LazilyCreateBuiltin(II, BuiltinID, S); 141 } 142 return 0; 143} 144 145void Sema::InitBuiltinVaListType() 146{ 147 if (!Context.getBuiltinVaListType().isNull()) 148 return; 149 150 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 151 ScopedDecl *VaDecl = LookupScopedDecl(VaIdent, Decl::IDNS_Ordinary, 152 SourceLocation(), TUScope); 153 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 154 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 155} 156 157/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 158/// lazily create a decl for it. 159ScopedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 160 Scope *S) { 161 Builtin::ID BID = (Builtin::ID)bid; 162 163 if (BID == Builtin::BI__builtin_va_start || 164 BID == Builtin::BI__builtin_va_copy || 165 BID == Builtin::BI__builtin_va_end) 166 InitBuiltinVaListType(); 167 168 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 169 FunctionDecl *New = FunctionDecl::Create(Context, SourceLocation(), II, R, 170 FunctionDecl::Extern, false, 0); 171 172 // Find translation-unit scope to insert this function into. 173 if (Scope *FnS = S->getFnParent()) 174 S = FnS->getParent(); // Skip all scopes in a function at once. 175 while (S->getParent()) 176 S = S->getParent(); 177 S->AddDecl(New); 178 179 // Add this decl to the end of the identifier info. 180 if (ScopedDecl *LastDecl = II->getFETokenInfo<ScopedDecl>()) { 181 // Scan until we find the last (outermost) decl in the id chain. 182 while (LastDecl->getNext()) 183 LastDecl = LastDecl->getNext(); 184 // Insert before (outside) it. 185 LastDecl->setNext(New); 186 } else { 187 II->setFETokenInfo(New); 188 } 189 return New; 190} 191 192/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 193/// and scope as a previous declaration 'Old'. Figure out how to resolve this 194/// situation, merging decls or emitting diagnostics as appropriate. 195/// 196TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, ScopedDecl *OldD) { 197 // Verify the old decl was also a typedef. 198 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 199 if (!Old) { 200 Diag(New->getLocation(), diag::err_redefinition_different_kind, 201 New->getName()); 202 Diag(OldD->getLocation(), diag::err_previous_definition); 203 return New; 204 } 205 206 // Allow multiple definitions for ObjC built-in typedefs. 207 // FIXME: Verify the underlying types are equivalent! 208 if (getLangOptions().ObjC1 && isBuiltinObjCType(New)) 209 return Old; 210 211 // Redeclaration of a type is a constraint violation (6.7.2.3p1). 212 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 213 // *either* declaration is in a system header. The code below implements 214 // this adhoc compatibility rule. FIXME: The following code will not 215 // work properly when compiling ".i" files (containing preprocessed output). 216 SourceManager &SrcMgr = Context.getSourceManager(); 217 const FileEntry *OldDeclFile = SrcMgr.getFileEntryForLoc(Old->getLocation()); 218 const FileEntry *NewDeclFile = SrcMgr.getFileEntryForLoc(New->getLocation()); 219 HeaderSearch &HdrInfo = PP.getHeaderSearchInfo(); 220 DirectoryLookup::DirType OldDirType = HdrInfo.getFileDirFlavor(OldDeclFile); 221 DirectoryLookup::DirType NewDirType = HdrInfo.getFileDirFlavor(NewDeclFile); 222 223 if ((OldDirType == DirectoryLookup::ExternCSystemHeaderDir || 224 NewDirType == DirectoryLookup::ExternCSystemHeaderDir) || 225 getLangOptions().Microsoft) 226 return New; 227 228 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 229 // TODO: This is totally simplistic. It should handle merging functions 230 // together etc, merging extern int X; int X; ... 231 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 232 Diag(Old->getLocation(), diag::err_previous_definition); 233 return New; 234} 235 236/// DeclhasAttr - returns true if decl Declaration already has the target attribute. 237static bool DeclHasAttr(const Decl *decl, const Attr *target) { 238 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 239 if (attr->getKind() == target->getKind()) 240 return true; 241 242 return false; 243} 244 245/// MergeAttributes - append attributes from the Old decl to the New one. 246static void MergeAttributes(Decl *New, Decl *Old) { 247 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 248 249// FIXME: fix this code to cleanup the Old attrs correctly 250 while (attr) { 251 tmp = attr; 252 attr = attr->getNext(); 253 254 if (!DeclHasAttr(New, tmp)) { 255 New->addAttr(tmp); 256 } else { 257 tmp->setNext(0); 258 delete(tmp); 259 } 260 } 261} 262 263/// MergeFunctionDecl - We just parsed a function 'New' which has the same name 264/// and scope as a previous declaration 'Old'. Figure out how to resolve this 265/// situation, merging decls or emitting diagnostics as appropriate. 266/// 267FunctionDecl *Sema::MergeFunctionDecl(FunctionDecl *New, ScopedDecl *OldD) { 268 // Verify the old decl was also a function. 269 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 270 if (!Old) { 271 Diag(New->getLocation(), diag::err_redefinition_different_kind, 272 New->getName()); 273 Diag(OldD->getLocation(), diag::err_previous_definition); 274 return New; 275 } 276 277 MergeAttributes(New, Old); 278 279 280 QualType OldQType = Old->getCanonicalType(); 281 QualType NewQType = New->getCanonicalType(); 282 283 // Function types need to be compatible, not identical. This handles 284 // duplicate function decls like "void f(int); void f(enum X);" properly. 285 if (Context.functionTypesAreCompatible(OldQType, NewQType)) 286 return New; 287 288 // A function that has already been declared has been redeclared or defined 289 // with a different type- show appropriate diagnostic 290 diag::kind PrevDiag = Old->getBody() ? diag::err_previous_definition : 291 diag::err_previous_declaration; 292 293 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 294 // TODO: This is totally simplistic. It should handle merging functions 295 // together etc, merging extern int X; int X; ... 296 Diag(New->getLocation(), diag::err_conflicting_types, New->getName()); 297 Diag(Old->getLocation(), PrevDiag); 298 return New; 299} 300 301/// equivalentArrayTypes - Used to determine whether two array types are 302/// equivalent. 303/// We need to check this explicitly as an incomplete array definition is 304/// considered a VariableArrayType, so will not match a complete array 305/// definition that would be otherwise equivalent. 306static bool areEquivalentArrayTypes(QualType NewQType, QualType OldQType) { 307 const ArrayType *NewAT = NewQType->getAsArrayType(); 308 const ArrayType *OldAT = OldQType->getAsArrayType(); 309 310 if (!NewAT || !OldAT) 311 return false; 312 313 // If either (or both) array types in incomplete we need to strip off the 314 // outer VariableArrayType. Once the outer VAT is removed the remaining 315 // types must be identical if the array types are to be considered 316 // equivalent. 317 // eg. int[][1] and int[1][1] become 318 // VAT(null, CAT(1, int)) and CAT(1, CAT(1, int)) 319 // removing the outermost VAT gives 320 // CAT(1, int) and CAT(1, int) 321 // which are equal, therefore the array types are equivalent. 322 if (NewAT->isIncompleteArrayType() || OldAT->isIncompleteArrayType()) { 323 if (NewAT->getIndexTypeQualifier() != OldAT->getIndexTypeQualifier()) 324 return false; 325 NewQType = NewAT->getElementType().getCanonicalType(); 326 OldQType = OldAT->getElementType().getCanonicalType(); 327 } 328 329 return NewQType == OldQType; 330} 331 332/// MergeVarDecl - We just parsed a variable 'New' which has the same name 333/// and scope as a previous declaration 'Old'. Figure out how to resolve this 334/// situation, merging decls or emitting diagnostics as appropriate. 335/// 336/// FIXME: Need to carefully consider tentative definition rules (C99 6.9.2p2). 337/// For example, we incorrectly complain about i1, i4 from C99 6.9.2p4. 338/// 339VarDecl *Sema::MergeVarDecl(VarDecl *New, ScopedDecl *OldD) { 340 // Verify the old decl was also a variable. 341 VarDecl *Old = dyn_cast<VarDecl>(OldD); 342 if (!Old) { 343 Diag(New->getLocation(), diag::err_redefinition_different_kind, 344 New->getName()); 345 Diag(OldD->getLocation(), diag::err_previous_definition); 346 return New; 347 } 348 349 MergeAttributes(New, Old); 350 351 // Verify the types match. 352 if (Old->getCanonicalType() != New->getCanonicalType() && 353 !areEquivalentArrayTypes(New->getCanonicalType(), Old->getCanonicalType())) { 354 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 355 Diag(Old->getLocation(), diag::err_previous_definition); 356 return New; 357 } 358 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 359 if (New->getStorageClass() == VarDecl::Static && 360 (Old->getStorageClass() == VarDecl::None || 361 Old->getStorageClass() == VarDecl::Extern)) { 362 Diag(New->getLocation(), diag::err_static_non_static, New->getName()); 363 Diag(Old->getLocation(), diag::err_previous_definition); 364 return New; 365 } 366 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 367 if (New->getStorageClass() != VarDecl::Static && 368 Old->getStorageClass() == VarDecl::Static) { 369 Diag(New->getLocation(), diag::err_non_static_static, New->getName()); 370 Diag(Old->getLocation(), diag::err_previous_definition); 371 return New; 372 } 373 // We've verified the types match, now handle "tentative" definitions. 374 FileVarDecl *OldFSDecl = dyn_cast<FileVarDecl>(Old); 375 FileVarDecl *NewFSDecl = dyn_cast<FileVarDecl>(New); 376 377 if (OldFSDecl && NewFSDecl) { 378 // Handle C "tentative" external object definitions (C99 6.9.2). 379 bool OldIsTentative = false; 380 bool NewIsTentative = false; 381 382 if (!OldFSDecl->getInit() && 383 (OldFSDecl->getStorageClass() == VarDecl::None || 384 OldFSDecl->getStorageClass() == VarDecl::Static)) 385 OldIsTentative = true; 386 387 // FIXME: this check doesn't work (since the initializer hasn't been 388 // attached yet). This check should be moved to FinalizeDeclaratorGroup. 389 // Unfortunately, by the time we get to FinializeDeclaratorGroup, we've 390 // thrown out the old decl. 391 if (!NewFSDecl->getInit() && 392 (NewFSDecl->getStorageClass() == VarDecl::None || 393 NewFSDecl->getStorageClass() == VarDecl::Static)) 394 ; // change to NewIsTentative = true; once the code is moved. 395 396 if (NewIsTentative || OldIsTentative) 397 return New; 398 } 399 if (Old->getStorageClass() != VarDecl::Extern && 400 New->getStorageClass() != VarDecl::Extern) { 401 Diag(New->getLocation(), diag::err_redefinition, New->getName()); 402 Diag(Old->getLocation(), diag::err_previous_definition); 403 } 404 return New; 405} 406 407/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 408/// no declarator (e.g. "struct foo;") is parsed. 409Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 410 // TODO: emit error on 'int;' or 'const enum foo;'. 411 // TODO: emit error on 'typedef int;' 412 // if (!DS.isMissingDeclaratorOk()) Diag(...); 413 414 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 415} 416 417bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 418 // Get the type before calling CheckSingleAssignmentConstraints(), since 419 // it can promote the expression. 420 QualType InitType = Init->getType(); 421 422 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 423 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 424 InitType, Init, "initializing"); 425} 426 427bool Sema::CheckInitExpr(Expr *expr, InitListExpr *IList, unsigned slot, 428 QualType ElementType) { 429 Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer. 430 if (CheckSingleInitializer(expr, ElementType)) 431 return true; // types weren't compatible. 432 433 if (savExpr != expr) // The type was promoted, update initializer list. 434 IList->setInit(slot, expr); 435 return false; 436} 437 438bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 439 if (const IncompleteArrayType *IAT = DeclT->getAsIncompleteArrayType()) { 440 // C99 6.7.8p14. We have an array of character type with unknown size 441 // being initialized to a string literal. 442 llvm::APSInt ConstVal(32); 443 ConstVal = strLiteral->getByteLength() + 1; 444 // Return a new array type (C99 6.7.8p22). 445 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 446 ArrayType::Normal, 0); 447 } else if (const ConstantArrayType *CAT = DeclT->getAsConstantArrayType()) { 448 // C99 6.7.8p14. We have an array of character type with known size. 449 if (strLiteral->getByteLength() > (unsigned)CAT->getMaximumElements()) 450 Diag(strLiteral->getSourceRange().getBegin(), 451 diag::warn_initializer_string_for_char_array_too_long, 452 strLiteral->getSourceRange()); 453 } else { 454 assert(0 && "HandleStringLiteralInit(): Invalid array type"); 455 } 456 // Set type from "char *" to "constant array of char". 457 strLiteral->setType(DeclT); 458 // For now, we always return false (meaning success). 459 return false; 460} 461 462StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 463 const ArrayType *AT = DeclType->getAsArrayType(); 464 if (AT && AT->getElementType()->isCharType()) { 465 return dyn_cast<StringLiteral>(Init); 466 } 467 return 0; 468} 469 470// CheckInitializerListTypes - Checks the types of elements of an initializer 471// list. This function is recursive: it calls itself to initialize subelements 472// of aggregate types. Note that the topLevel parameter essentially refers to 473// whether this expression "owns" the initializer list passed in, or if this 474// initialization is taking elements out of a parent initializer. Each 475// call to this function adds zero or more to startIndex, reports any errors, 476// and returns true if it found any inconsistent types. 477bool Sema::CheckInitializerListTypes(InitListExpr*& IList, QualType &DeclType, 478 bool topLevel, unsigned& startIndex) { 479 bool hadError = false; 480 481 if (DeclType->isScalarType()) { 482 // The simplest case: initializing a single scalar 483 if (topLevel) { 484 Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init, 485 IList->getSourceRange()); 486 } 487 if (startIndex < IList->getNumInits()) { 488 Expr* expr = IList->getInit(startIndex); 489 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 490 // FIXME: Should an error be reported here instead? 491 unsigned newIndex = 0; 492 CheckInitializerListTypes(SubInitList, DeclType, true, newIndex); 493 } else { 494 hadError |= CheckInitExpr(expr, IList, startIndex, DeclType); 495 } 496 ++startIndex; 497 } 498 // FIXME: Should an error be reported for empty initializer list + scalar? 499 } else if (DeclType->isVectorType()) { 500 if (startIndex < IList->getNumInits()) { 501 const VectorType *VT = DeclType->getAsVectorType(); 502 int maxElements = VT->getNumElements(); 503 QualType elementType = VT->getElementType(); 504 505 for (int i = 0; i < maxElements; ++i) { 506 // Don't attempt to go past the end of the init list 507 if (startIndex >= IList->getNumInits()) 508 break; 509 Expr* expr = IList->getInit(startIndex); 510 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 511 unsigned newIndex = 0; 512 hadError |= CheckInitializerListTypes(SubInitList, elementType, 513 true, newIndex); 514 ++startIndex; 515 } else { 516 hadError |= CheckInitializerListTypes(IList, elementType, 517 false, startIndex); 518 } 519 } 520 } 521 } else if (DeclType->isAggregateType() || DeclType->isUnionType()) { 522 if (DeclType->isStructureType() || DeclType->isUnionType()) { 523 if (startIndex < IList->getNumInits() && !topLevel && 524 Context.typesAreCompatible(IList->getInit(startIndex)->getType(), 525 DeclType)) { 526 // We found a compatible struct; per the standard, this initializes the 527 // struct. (The C standard technically says that this only applies for 528 // initializers for declarations with automatic scope; however, this 529 // construct is unambiguous anyway because a struct cannot contain 530 // a type compatible with itself. We'll output an error when we check 531 // if the initializer is constant.) 532 // FIXME: Is a call to CheckSingleInitializer required here? 533 ++startIndex; 534 } else { 535 RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl(); 536 537 // If the record is invalid, some of it's members are invalid. To avoid 538 // confusion, we forgo checking the intializer for the entire record. 539 if (structDecl->isInvalidDecl()) 540 return true; 541 542 // If structDecl is a forward declaration, this loop won't do anything; 543 // That's okay, because an error should get printed out elsewhere. It 544 // might be worthwhile to skip over the rest of the initializer, though. 545 int numMembers = structDecl->getNumMembers() - 546 structDecl->hasFlexibleArrayMember(); 547 for (int i = 0; i < numMembers; i++) { 548 // Don't attempt to go past the end of the init list 549 if (startIndex >= IList->getNumInits()) 550 break; 551 FieldDecl * curField = structDecl->getMember(i); 552 if (!curField->getIdentifier()) { 553 // Don't initialize unnamed fields, e.g. "int : 20;" 554 continue; 555 } 556 QualType fieldType = curField->getType(); 557 Expr* expr = IList->getInit(startIndex); 558 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 559 unsigned newStart = 0; 560 hadError |= CheckInitializerListTypes(SubInitList, fieldType, 561 true, newStart); 562 ++startIndex; 563 } else { 564 hadError |= CheckInitializerListTypes(IList, fieldType, 565 false, startIndex); 566 } 567 if (DeclType->isUnionType()) 568 break; 569 } 570 // FIXME: Implement flexible array initialization GCC extension (it's a 571 // really messy extension to implement, unfortunately...the necessary 572 // information isn't actually even here!) 573 } 574 } else if (DeclType->isArrayType()) { 575 // Check for the special-case of initializing an array with a string. 576 if (startIndex < IList->getNumInits()) { 577 if (StringLiteral *lit = IsStringLiteralInit(IList->getInit(startIndex), 578 DeclType)) { 579 CheckStringLiteralInit(lit, DeclType); 580 ++startIndex; 581 if (topLevel && startIndex < IList->getNumInits()) { 582 // We have leftover initializers; warn 583 Diag(IList->getInit(startIndex)->getLocStart(), 584 diag::err_excess_initializers_in_char_array_initializer, 585 IList->getInit(startIndex)->getSourceRange()); 586 } 587 return false; 588 } 589 } 590 int maxElements; 591 if (DeclType->isIncompleteArrayType()) { 592 // FIXME: use a proper constant 593 maxElements = 0x7FFFFFFF; 594 } else if (const VariableArrayType *VAT = 595 DeclType->getAsVariableArrayType()) { 596 // Check for VLAs; in standard C it would be possible to check this 597 // earlier, but I don't know where clang accepts VLAs (gcc accepts 598 // them in all sorts of strange places). 599 Diag(VAT->getSizeExpr()->getLocStart(), 600 diag::err_variable_object_no_init, 601 VAT->getSizeExpr()->getSourceRange()); 602 hadError = true; 603 maxElements = 0x7FFFFFFF; 604 } else { 605 const ConstantArrayType *CAT = DeclType->getAsConstantArrayType(); 606 maxElements = static_cast<int>(CAT->getSize().getZExtValue()); 607 } 608 QualType elementType = DeclType->getAsArrayType()->getElementType(); 609 int numElements = 0; 610 for (int i = 0; i < maxElements; ++i, ++numElements) { 611 // Don't attempt to go past the end of the init list 612 if (startIndex >= IList->getNumInits()) 613 break; 614 Expr* expr = IList->getInit(startIndex); 615 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { 616 unsigned newIndex = 0; 617 hadError |= CheckInitializerListTypes(SubInitList, elementType, 618 true, newIndex); 619 ++startIndex; 620 } else { 621 hadError |= CheckInitializerListTypes(IList, elementType, 622 false, startIndex); 623 } 624 } 625 if (DeclType->isIncompleteArrayType()) { 626 // If this is an incomplete array type, the actual type needs to 627 // be calculated here 628 if (numElements == 0) { 629 // Sizing an array implicitly to zero is not allowed 630 // (It could in theory be allowed, but it doesn't really matter.) 631 Diag(IList->getLocStart(), 632 diag::err_at_least_one_initializer_needed_to_size_array); 633 hadError = true; 634 } else { 635 llvm::APSInt ConstVal(32); 636 ConstVal = numElements; 637 DeclType = Context.getConstantArrayType(elementType, ConstVal, 638 ArrayType::Normal, 0); 639 } 640 } 641 } else { 642 assert(0 && "Aggregate that isn't a function or array?!"); 643 } 644 } else { 645 // In C, all types are either scalars or aggregates, but 646 // additional handling is needed here for C++ (and possibly others?). 647 assert(0 && "Unsupported initializer type"); 648 } 649 650 // If this init list is a base list, we set the type; an initializer doesn't 651 // fundamentally have a type, but this makes the ASTs a bit easier to read 652 if (topLevel) 653 IList->setType(DeclType); 654 655 if (topLevel && startIndex < IList->getNumInits()) { 656 // We have leftover initializers; warn 657 Diag(IList->getInit(startIndex)->getLocStart(), 658 diag::warn_excess_initializers, 659 IList->getInit(startIndex)->getSourceRange()); 660 } 661 return hadError; 662} 663 664bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType) { 665 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 666 // of unknown size ("[]") or an object type that is not a variable array type. 667 if (const VariableArrayType *VAT = DeclType->getAsVariableArrayType()) 668 return Diag(VAT->getSizeExpr()->getLocStart(), 669 diag::err_variable_object_no_init, 670 VAT->getSizeExpr()->getSourceRange()); 671 672 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 673 if (!InitList) { 674 // FIXME: Handle wide strings 675 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 676 return CheckStringLiteralInit(strLiteral, DeclType); 677 678 if (DeclType->isArrayType()) 679 return Diag(Init->getLocStart(), 680 diag::err_array_init_list_required, 681 Init->getSourceRange()); 682 683 return CheckSingleInitializer(Init, DeclType); 684 } 685 unsigned newIndex = 0; 686 return CheckInitializerListTypes(InitList, DeclType, true, newIndex); 687} 688 689Sema::DeclTy * 690Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl) { 691 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 692 IdentifierInfo *II = D.getIdentifier(); 693 694 // All of these full declarators require an identifier. If it doesn't have 695 // one, the ParsedFreeStandingDeclSpec action should be used. 696 if (II == 0) { 697 Diag(D.getDeclSpec().getSourceRange().getBegin(), 698 diag::err_declarator_need_ident, 699 D.getDeclSpec().getSourceRange(), D.getSourceRange()); 700 return 0; 701 } 702 703 // The scope passed in may not be a decl scope. Zip up the scope tree until 704 // we find one that is. 705 while ((S->getFlags() & Scope::DeclScope) == 0) 706 S = S->getParent(); 707 708 // See if this is a redefinition of a variable in the same scope. 709 ScopedDecl *PrevDecl = LookupScopedDecl(II, Decl::IDNS_Ordinary, 710 D.getIdentifierLoc(), S); 711 ScopedDecl *New; 712 bool InvalidDecl = false; 713 714 QualType R = GetTypeForDeclarator(D, S); 715 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 716 717 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 718 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 719 if (!NewTD) return 0; 720 721 // Handle attributes prior to checking for duplicates in MergeVarDecl 722 HandleDeclAttributes(NewTD, D.getDeclSpec().getAttributes(), 723 D.getAttributes()); 724 // Merge the decl with the existing one if appropriate. If the decl is 725 // in an outer scope, it isn't the same thing. 726 if (PrevDecl && S->isDeclScope(PrevDecl)) { 727 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 728 if (NewTD == 0) return 0; 729 } 730 New = NewTD; 731 if (S->getParent() == 0) { 732 // C99 6.7.7p2: If a typedef name specifies a variably modified type 733 // then it shall have block scope. 734 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 735 // FIXME: Diagnostic needs to be fixed. 736 Diag(D.getIdentifierLoc(), diag::err_typecheck_illegal_vla); 737 InvalidDecl = true; 738 } 739 } 740 } else if (R.getTypePtr()->isFunctionType()) { 741 FunctionDecl::StorageClass SC = FunctionDecl::None; 742 switch (D.getDeclSpec().getStorageClassSpec()) { 743 default: assert(0 && "Unknown storage class!"); 744 case DeclSpec::SCS_auto: 745 case DeclSpec::SCS_register: 746 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func, 747 R.getAsString()); 748 InvalidDecl = true; 749 break; 750 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 751 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 752 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 753 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 754 } 755 756 bool isInline = D.getDeclSpec().isInlineSpecified(); 757 FunctionDecl *NewFD = FunctionDecl::Create(Context, D.getIdentifierLoc(), 758 II, R, SC, isInline, 759 LastDeclarator); 760 // Handle attributes. 761 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 762 D.getAttributes()); 763 764 // Merge the decl with the existing one if appropriate. Since C functions 765 // are in a flat namespace, make sure we consider decls in outer scopes. 766 if (PrevDecl) { 767 NewFD = MergeFunctionDecl(NewFD, PrevDecl); 768 if (NewFD == 0) return 0; 769 } 770 New = NewFD; 771 } else { 772 if (R.getTypePtr()->isObjCInterfaceType()) { 773 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object, 774 D.getIdentifier()->getName()); 775 InvalidDecl = true; 776 } 777 778 VarDecl *NewVD; 779 VarDecl::StorageClass SC; 780 switch (D.getDeclSpec().getStorageClassSpec()) { 781 default: assert(0 && "Unknown storage class!"); 782 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 783 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 784 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 785 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 786 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 787 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 788 } 789 if (S->getParent() == 0) { 790 // C99 6.9p2: The storage-class specifiers auto and register shall not 791 // appear in the declaration specifiers in an external declaration. 792 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 793 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope, 794 R.getAsString()); 795 InvalidDecl = true; 796 } 797 NewVD = FileVarDecl::Create(Context, D.getIdentifierLoc(), II, R, SC, 798 LastDeclarator); 799 } else { 800 NewVD = BlockVarDecl::Create(Context, D.getIdentifierLoc(), II, R, SC, 801 LastDeclarator); 802 } 803 // Handle attributes prior to checking for duplicates in MergeVarDecl 804 HandleDeclAttributes(NewVD, D.getDeclSpec().getAttributes(), 805 D.getAttributes()); 806 807 // Emit an error if an address space was applied to decl with local storage. 808 // This includes arrays of objects with address space qualifiers, but not 809 // automatic variables that point to other address spaces. 810 // ISO/IEC TR 18037 S5.1.2 811 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 812 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 813 InvalidDecl = true; 814 } 815 // Merge the decl with the existing one if appropriate. If the decl is 816 // in an outer scope, it isn't the same thing. 817 if (PrevDecl && S->isDeclScope(PrevDecl)) { 818 NewVD = MergeVarDecl(NewVD, PrevDecl); 819 if (NewVD == 0) return 0; 820 } 821 New = NewVD; 822 } 823 824 // If this has an identifier, add it to the scope stack. 825 if (II) { 826 New->setNext(II->getFETokenInfo<ScopedDecl>()); 827 II->setFETokenInfo(New); 828 S->AddDecl(New); 829 } 830 // If any semantic error occurred, mark the decl as invalid. 831 if (D.getInvalidType() || InvalidDecl) 832 New->setInvalidDecl(); 833 834 return New; 835} 836 837bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 838 SourceLocation loc; 839 // FIXME: Remove the isReference check and handle assignment to a reference. 840 if (!DclT->isReferenceType() && !Init->isConstantExpr(Context, &loc)) { 841 assert(loc.isValid() && "isConstantExpr didn't return a loc!"); 842 Diag(loc, diag::err_init_element_not_constant, Init->getSourceRange()); 843 return true; 844 } 845 return false; 846} 847 848void Sema::AddInitializerToDecl(DeclTy *dcl, ExprTy *init) { 849 Decl *RealDecl = static_cast<Decl *>(dcl); 850 Expr *Init = static_cast<Expr *>(init); 851 assert(Init && "missing initializer"); 852 853 // If there is no declaration, there was an error parsing it. Just ignore 854 // the initializer. 855 if (RealDecl == 0) { 856 delete Init; 857 return; 858 } 859 860 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 861 if (!VDecl) { 862 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 863 diag::err_illegal_initializer); 864 RealDecl->setInvalidDecl(); 865 return; 866 } 867 // Get the decls type and save a reference for later, since 868 // CheckInitializerTypes may change it. 869 QualType DclT = VDecl->getType(), SavT = DclT; 870 if (BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(VDecl)) { 871 VarDecl::StorageClass SC = BVD->getStorageClass(); 872 if (SC == VarDecl::Extern) { // C99 6.7.8p5 873 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 874 BVD->setInvalidDecl(); 875 } else if (!BVD->isInvalidDecl()) { 876 if (CheckInitializerTypes(Init, DclT)) 877 BVD->setInvalidDecl(); 878 if (SC == VarDecl::Static) // C99 6.7.8p4. 879 CheckForConstantInitializer(Init, DclT); 880 } 881 } else if (FileVarDecl *FVD = dyn_cast<FileVarDecl>(VDecl)) { 882 if (FVD->getStorageClass() == VarDecl::Extern) 883 Diag(VDecl->getLocation(), diag::warn_extern_init); 884 if (!FVD->isInvalidDecl()) 885 if (CheckInitializerTypes(Init, DclT)) 886 FVD->setInvalidDecl(); 887 888 // C99 6.7.8p4. All file scoped initializers need to be constant. 889 CheckForConstantInitializer(Init, DclT); 890 } 891 // If the type changed, it means we had an incomplete type that was 892 // completed by the initializer. For example: 893 // int ary[] = { 1, 3, 5 }; 894 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 895 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 896 VDecl->setType(DclT); 897 Init->setType(DclT); 898 } 899 900 // Attach the initializer to the decl. 901 VDecl->setInit(Init); 902 return; 903} 904 905/// The declarators are chained together backwards, reverse the list. 906Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 907 // Often we have single declarators, handle them quickly. 908 Decl *GroupDecl = static_cast<Decl*>(group); 909 if (GroupDecl == 0) 910 return 0; 911 912 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 913 ScopedDecl *NewGroup = 0; 914 if (Group->getNextDeclarator() == 0) 915 NewGroup = Group; 916 else { // reverse the list. 917 while (Group) { 918 ScopedDecl *Next = Group->getNextDeclarator(); 919 Group->setNextDeclarator(NewGroup); 920 NewGroup = Group; 921 Group = Next; 922 } 923 } 924 // Perform semantic analysis that depends on having fully processed both 925 // the declarator and initializer. 926 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 927 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 928 if (!IDecl) 929 continue; 930 FileVarDecl *FVD = dyn_cast<FileVarDecl>(IDecl); 931 BlockVarDecl *BVD = dyn_cast<BlockVarDecl>(IDecl); 932 QualType T = IDecl->getType(); 933 934 // C99 6.7.5.2p2: If an identifier is declared to be an object with 935 // static storage duration, it shall not have a variable length array. 936 if ((FVD || BVD) && IDecl->getStorageClass() == VarDecl::Static) { 937 if (T->getAsVariableArrayType()) { 938 Diag(IDecl->getLocation(), diag::err_typecheck_illegal_vla); 939 IDecl->setInvalidDecl(); 940 } 941 } 942 // Block scope. C99 6.7p7: If an identifier for an object is declared with 943 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 944 if (BVD && IDecl->getStorageClass() != VarDecl::Extern) { 945 if (T->isIncompleteType()) { 946 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 947 T.getAsString()); 948 IDecl->setInvalidDecl(); 949 } 950 } 951 // File scope. C99 6.9.2p2: A declaration of an identifier for and 952 // object that has file scope without an initializer, and without a 953 // storage-class specifier or with the storage-class specifier "static", 954 // constitutes a tentative definition. Note: A tentative definition with 955 // external linkage is valid (C99 6.2.2p5). 956 if (FVD && !FVD->getInit() && (FVD->getStorageClass() == VarDecl::Static || 957 FVD->getStorageClass() == VarDecl::None)) { 958 if (T->isIncompleteArrayType()) { 959 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 960 // array to be completed. Don't issue a diagnostic. 961 } else if (T->isIncompleteType()) { 962 // C99 6.9.2p3: If the declaration of an identifier for an object is 963 // a tentative definition and has internal linkage (C99 6.2.2p3), the 964 // declared type shall not be an incomplete type. 965 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 966 T.getAsString()); 967 IDecl->setInvalidDecl(); 968 } 969 } 970 } 971 return NewGroup; 972} 973 974// Called from Sema::ParseStartOfFunctionDef(). 975ParmVarDecl * 976Sema::ActOnParamDeclarator(struct DeclaratorChunk::ParamInfo &PI, 977 Scope *FnScope) { 978 IdentifierInfo *II = PI.Ident; 979 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 980 // Can this happen for params? We already checked that they don't conflict 981 // among each other. Here they can only shadow globals, which is ok. 982 if (/*Decl *PrevDecl = */LookupScopedDecl(II, Decl::IDNS_Ordinary, 983 PI.IdentLoc, FnScope)) { 984 985 } 986 987 // FIXME: Handle storage class (auto, register). No declarator? 988 // TODO: Chain to previous parameter with the prevdeclarator chain? 989 990 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 991 // Doing the promotion here has a win and a loss. The win is the type for 992 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 993 // code generator). The loss is the orginal type isn't preserved. For example: 994 // 995 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 996 // int blockvardecl[5]; 997 // sizeof(parmvardecl); // size == 4 998 // sizeof(blockvardecl); // size == 20 999 // } 1000 // 1001 // For expressions, all implicit conversions are captured using the 1002 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 1003 // 1004 // FIXME: If a source translation tool needs to see the original type, then 1005 // we need to consider storing both types (in ParmVarDecl)... 1006 // 1007 QualType parmDeclType = QualType::getFromOpaquePtr(PI.TypeInfo); 1008 if (const ArrayType *AT = parmDeclType->getAsArrayType()) { 1009 // int x[restrict 4] -> int *restrict 1010 parmDeclType = Context.getPointerType(AT->getElementType()); 1011 parmDeclType = parmDeclType.getQualifiedType(AT->getIndexTypeQualifier()); 1012 } else if (parmDeclType->isFunctionType()) 1013 parmDeclType = Context.getPointerType(parmDeclType); 1014 1015 ParmVarDecl *New = ParmVarDecl::Create(Context, PI.IdentLoc, II, parmDeclType, 1016 VarDecl::None, 0); 1017 1018 if (PI.InvalidType) 1019 New->setInvalidDecl(); 1020 1021 // If this has an identifier, add it to the scope stack. 1022 if (II) { 1023 New->setNext(II->getFETokenInfo<ScopedDecl>()); 1024 II->setFETokenInfo(New); 1025 FnScope->AddDecl(New); 1026 } 1027 1028 HandleDeclAttributes(New, PI.AttrList, 0); 1029 return New; 1030} 1031 1032Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 1033 assert(CurFunctionDecl == 0 && "Function parsing confused"); 1034 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 1035 "Not a function declarator!"); 1036 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1037 1038 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 1039 // for a K&R function. 1040 if (!FTI.hasPrototype) { 1041 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1042 if (FTI.ArgInfo[i].TypeInfo == 0) { 1043 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared, 1044 FTI.ArgInfo[i].Ident->getName()); 1045 // Implicitly declare the argument as type 'int' for lack of a better 1046 // type. 1047 FTI.ArgInfo[i].TypeInfo = Context.IntTy.getAsOpaquePtr(); 1048 } 1049 } 1050 1051 // Since this is a function definition, act as though we have information 1052 // about the arguments. 1053 if (FTI.NumArgs) 1054 FTI.hasPrototype = true; 1055 } else { 1056 // FIXME: Diagnose arguments without names in C. 1057 1058 } 1059 1060 Scope *GlobalScope = FnBodyScope->getParent(); 1061 1062 // See if this is a redefinition. 1063 ScopedDecl *PrevDcl = LookupScopedDecl(D.getIdentifier(), Decl::IDNS_Ordinary, 1064 D.getIdentifierLoc(), GlobalScope); 1065 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(PrevDcl)) { 1066 if (FD->getBody()) { 1067 Diag(D.getIdentifierLoc(), diag::err_redefinition, 1068 D.getIdentifier()->getName()); 1069 Diag(FD->getLocation(), diag::err_previous_definition); 1070 } 1071 } 1072 Decl *decl = static_cast<Decl*>(ActOnDeclarator(GlobalScope, D, 0)); 1073 FunctionDecl *FD = cast<FunctionDecl>(decl); 1074 CurFunctionDecl = FD; 1075 1076 // Create Decl objects for each parameter, adding them to the FunctionDecl. 1077 llvm::SmallVector<ParmVarDecl*, 16> Params; 1078 1079 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 1080 // no arguments, not a function that takes a single void argument. 1081 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1082 !QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo).getCVRQualifiers() && 1083 QualType::getFromOpaquePtr(FTI.ArgInfo[0].TypeInfo)->isVoidType()) { 1084 // empty arg list, don't push any params. 1085 } else { 1086 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1087 ParmVarDecl *parmDecl; 1088 1089 parmDecl = ActOnParamDeclarator(D.getTypeObject(0).Fun.ArgInfo[i], 1090 FnBodyScope); 1091 // C99 6.7.5.3p4: the parameters in a parameter type list in a function 1092 // declarator that is part of a function definition of that function 1093 // shall not have incomplete type. 1094 if (parmDecl->getType()->isIncompleteType()) { 1095 Diag(parmDecl->getLocation(), diag::err_typecheck_decl_incomplete_type, 1096 parmDecl->getType().getAsString()); 1097 parmDecl->setInvalidDecl(); 1098 } 1099 Params.push_back(parmDecl); 1100 } 1101 } 1102 1103 FD->setParams(&Params[0], Params.size()); 1104 1105 return FD; 1106} 1107 1108Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtTy *Body) { 1109 Decl *dcl = static_cast<Decl *>(D); 1110 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 1111 FD->setBody((Stmt*)Body); 1112 assert(FD == CurFunctionDecl && "Function parsing confused"); 1113 CurFunctionDecl = 0; 1114 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(dcl)) { 1115 MD->setBody((Stmt*)Body); 1116 CurMethodDecl = 0; 1117 } 1118 // Verify and clean out per-function state. 1119 1120 // Check goto/label use. 1121 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 1122 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 1123 // Verify that we have no forward references left. If so, there was a goto 1124 // or address of a label taken, but no definition of it. Label fwd 1125 // definitions are indicated with a null substmt. 1126 if (I->second->getSubStmt() == 0) { 1127 LabelStmt *L = I->second; 1128 // Emit error. 1129 Diag(L->getIdentLoc(), diag::err_undeclared_label_use, L->getName()); 1130 1131 // At this point, we have gotos that use the bogus label. Stitch it into 1132 // the function body so that they aren't leaked and that the AST is well 1133 // formed. 1134 if (Body) { 1135 L->setSubStmt(new NullStmt(L->getIdentLoc())); 1136 cast<CompoundStmt>((Stmt*)Body)->push_back(L); 1137 } else { 1138 // The whole function wasn't parsed correctly, just delete this. 1139 delete L; 1140 } 1141 } 1142 } 1143 LabelMap.clear(); 1144 1145 return D; 1146} 1147 1148/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 1149/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 1150ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 1151 IdentifierInfo &II, Scope *S) { 1152 if (getLangOptions().C99) // Extension in C99. 1153 Diag(Loc, diag::ext_implicit_function_decl, II.getName()); 1154 else // Legal in C90, but warn about it. 1155 Diag(Loc, diag::warn_implicit_function_decl, II.getName()); 1156 1157 // FIXME: handle stuff like: 1158 // void foo() { extern float X(); } 1159 // void bar() { X(); } <-- implicit decl for X in another scope. 1160 1161 // Set a Declarator for the implicit definition: int foo(); 1162 const char *Dummy; 1163 DeclSpec DS; 1164 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 1165 Error = Error; // Silence warning. 1166 assert(!Error && "Error setting up implicit decl!"); 1167 Declarator D(DS, Declarator::BlockContext); 1168 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, Loc)); 1169 D.SetIdentifier(&II, Loc); 1170 1171 // Find translation-unit scope to insert this function into. 1172 if (Scope *FnS = S->getFnParent()) 1173 S = FnS->getParent(); // Skip all scopes in a function at once. 1174 while (S->getParent()) 1175 S = S->getParent(); 1176 1177 return dyn_cast<ScopedDecl>(static_cast<Decl*>(ActOnDeclarator(S, D, 0))); 1178} 1179 1180 1181TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 1182 ScopedDecl *LastDeclarator) { 1183 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 1184 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1185 1186 // Scope manipulation handled by caller. 1187 TypedefDecl *NewTD = TypedefDecl::Create(Context, D.getIdentifierLoc(), 1188 D.getIdentifier(), 1189 T, LastDeclarator); 1190 if (D.getInvalidType()) 1191 NewTD->setInvalidDecl(); 1192 return NewTD; 1193} 1194 1195/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 1196/// former case, Name will be non-null. In the later case, Name will be null. 1197/// TagType indicates what kind of tag this is. TK indicates whether this is a 1198/// reference/declaration/definition of a tag. 1199Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 1200 SourceLocation KWLoc, IdentifierInfo *Name, 1201 SourceLocation NameLoc, AttributeList *Attr) { 1202 // If this is a use of an existing tag, it must have a name. 1203 assert((Name != 0 || TK == TK_Definition) && 1204 "Nameless record must be a definition!"); 1205 1206 Decl::Kind Kind; 1207 switch (TagType) { 1208 default: assert(0 && "Unknown tag type!"); 1209 case DeclSpec::TST_struct: Kind = Decl::Struct; break; 1210 case DeclSpec::TST_union: Kind = Decl::Union; break; 1211//case DeclSpec::TST_class: Kind = Decl::Class; break; 1212 case DeclSpec::TST_enum: Kind = Decl::Enum; break; 1213 } 1214 1215 // If this is a named struct, check to see if there was a previous forward 1216 // declaration or definition. 1217 if (TagDecl *PrevDecl = 1218 dyn_cast_or_null<TagDecl>(LookupScopedDecl(Name, Decl::IDNS_Tag, 1219 NameLoc, S))) { 1220 1221 // If this is a use of a previous tag, or if the tag is already declared in 1222 // the same scope (so that the definition/declaration completes or 1223 // rementions the tag), reuse the decl. 1224 if (TK == TK_Reference || S->isDeclScope(PrevDecl)) { 1225 // Make sure that this wasn't declared as an enum and now used as a struct 1226 // or something similar. 1227 if (PrevDecl->getKind() != Kind) { 1228 Diag(KWLoc, diag::err_use_with_wrong_tag, Name->getName()); 1229 Diag(PrevDecl->getLocation(), diag::err_previous_use); 1230 } 1231 1232 // If this is a use or a forward declaration, we're good. 1233 if (TK != TK_Definition) 1234 return PrevDecl; 1235 1236 // Diagnose attempts to redefine a tag. 1237 if (PrevDecl->isDefinition()) { 1238 Diag(NameLoc, diag::err_redefinition, Name->getName()); 1239 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1240 // If this is a redefinition, recover by making this struct be 1241 // anonymous, which will make any later references get the previous 1242 // definition. 1243 Name = 0; 1244 } else { 1245 // Okay, this is definition of a previously declared or referenced tag. 1246 // Move the location of the decl to be the definition site. 1247 PrevDecl->setLocation(NameLoc); 1248 return PrevDecl; 1249 } 1250 } 1251 // If we get here, this is a definition of a new struct type in a nested 1252 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a new 1253 // type. 1254 } 1255 1256 // If there is an identifier, use the location of the identifier as the 1257 // location of the decl, otherwise use the location of the struct/union 1258 // keyword. 1259 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 1260 1261 // Otherwise, if this is the first time we've seen this tag, create the decl. 1262 TagDecl *New; 1263 switch (Kind) { 1264 default: assert(0 && "Unknown tag kind!"); 1265 case Decl::Enum: 1266 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1267 // enum X { A, B, C } D; D should chain to X. 1268 New = EnumDecl::Create(Context, Loc, Name, 0); 1269 // If this is an undefined enum, warn. 1270 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 1271 break; 1272 case Decl::Union: 1273 case Decl::Struct: 1274 case Decl::Class: 1275 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 1276 // struct X { int A; } D; D should chain to X. 1277 New = RecordDecl::Create(Context, Kind, Loc, Name, 0); 1278 break; 1279 } 1280 1281 // If this has an identifier, add it to the scope stack. 1282 if (Name) { 1283 // The scope passed in may not be a decl scope. Zip up the scope tree until 1284 // we find one that is. 1285 while ((S->getFlags() & Scope::DeclScope) == 0) 1286 S = S->getParent(); 1287 1288 // Add it to the decl chain. 1289 New->setNext(Name->getFETokenInfo<ScopedDecl>()); 1290 Name->setFETokenInfo(New); 1291 S->AddDecl(New); 1292 } 1293 1294 HandleDeclAttributes(New, Attr, 0); 1295 return New; 1296} 1297 1298/// ActOnField - Each field of a struct/union/class is passed into this in order 1299/// to create a FieldDecl object for it. 1300Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *tagDecl, 1301 SourceLocation DeclStart, 1302 Declarator &D, ExprTy *BitfieldWidth) { 1303 IdentifierInfo *II = D.getIdentifier(); 1304 Expr *BitWidth = (Expr*)BitfieldWidth; 1305 Decl *TagDecl = static_cast<Decl *>(tagDecl); 1306 SourceLocation Loc = DeclStart; 1307 if (II) Loc = D.getIdentifierLoc(); 1308 1309 // FIXME: Unnamed fields can be handled in various different ways, for 1310 // example, unnamed unions inject all members into the struct namespace! 1311 1312 1313 if (BitWidth) { 1314 // TODO: Validate. 1315 //printf("WARNING: BITFIELDS IGNORED!\n"); 1316 1317 // 6.7.2.1p3 1318 // 6.7.2.1p4 1319 1320 } else { 1321 // Not a bitfield. 1322 1323 // validate II. 1324 1325 } 1326 1327 QualType T = GetTypeForDeclarator(D, S); 1328 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 1329 bool InvalidDecl = false; 1330 1331 // C99 6.7.2.1p8: A member of a structure or union may have any type other 1332 // than a variably modified type. 1333 if (T->isVariablyModifiedType()) { 1334 // FIXME: This diagnostic needs work 1335 Diag(Loc, diag::err_typecheck_illegal_vla, Loc); 1336 InvalidDecl = true; 1337 } 1338 // FIXME: Chain fielddecls together. 1339 FieldDecl *NewFD; 1340 1341 if (isa<RecordDecl>(TagDecl)) 1342 NewFD = FieldDecl::Create(Context, Loc, II, T, BitWidth); 1343 else if (isa<ObjCInterfaceDecl>(TagDecl) || 1344 isa<ObjCImplementationDecl>(TagDecl) || 1345 isa<ObjCCategoryDecl>(TagDecl) || 1346 // FIXME: ivars are currently used to model properties, and 1347 // properties can appear within a protocol. 1348 // See corresponding FIXME in DeclObjC.h:ObjCPropertyDecl. 1349 isa<ObjCProtocolDecl>(TagDecl)) 1350 NewFD = ObjCIvarDecl::Create(Context, Loc, II, T); 1351 else 1352 assert(0 && "Sema::ActOnField(): Unknown TagDecl"); 1353 1354 HandleDeclAttributes(NewFD, D.getDeclSpec().getAttributes(), 1355 D.getAttributes()); 1356 1357 if (D.getInvalidType() || InvalidDecl) 1358 NewFD->setInvalidDecl(); 1359 return NewFD; 1360} 1361 1362/// TranslateIvarVisibility - Translate visibility from a token ID to an 1363/// AST enum value. 1364static ObjCIvarDecl::AccessControl 1365TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 1366 switch (ivarVisibility) { 1367 case tok::objc_private: return ObjCIvarDecl::Private; 1368 case tok::objc_public: return ObjCIvarDecl::Public; 1369 case tok::objc_protected: return ObjCIvarDecl::Protected; 1370 case tok::objc_package: return ObjCIvarDecl::Package; 1371 default: assert(false && "Unknown visitibility kind"); 1372 } 1373} 1374 1375void Sema::ActOnFields(Scope* S, 1376 SourceLocation RecLoc, DeclTy *RecDecl, 1377 DeclTy **Fields, unsigned NumFields, 1378 SourceLocation LBrac, SourceLocation RBrac, 1379 tok::ObjCKeywordKind *visibility) { 1380 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 1381 assert(EnclosingDecl && "missing record or interface decl"); 1382 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 1383 1384 if (Record && Record->isDefinition()) { 1385 // Diagnose code like: 1386 // struct S { struct S {} X; }; 1387 // We discover this when we complete the outer S. Reject and ignore the 1388 // outer S. 1389 Diag(Record->getLocation(), diag::err_nested_redefinition, 1390 Record->getKindName()); 1391 Diag(RecLoc, diag::err_previous_definition); 1392 Record->setInvalidDecl(); 1393 return; 1394 } 1395 // Verify that all the fields are okay. 1396 unsigned NumNamedMembers = 0; 1397 llvm::SmallVector<FieldDecl*, 32> RecFields; 1398 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 1399 1400 for (unsigned i = 0; i != NumFields; ++i) { 1401 1402 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 1403 assert(FD && "missing field decl"); 1404 1405 // Remember all fields. 1406 RecFields.push_back(FD); 1407 1408 // Get the type for the field. 1409 Type *FDTy = FD->getType().getTypePtr(); 1410 1411 // If we have visibility info, make sure the AST is set accordingly. 1412 if (visibility) 1413 cast<ObjCIvarDecl>(FD)->setAccessControl( 1414 TranslateIvarVisibility(visibility[i])); 1415 1416 // C99 6.7.2.1p2 - A field may not be a function type. 1417 if (FDTy->isFunctionType()) { 1418 Diag(FD->getLocation(), diag::err_field_declared_as_function, 1419 FD->getName()); 1420 FD->setInvalidDecl(); 1421 EnclosingDecl->setInvalidDecl(); 1422 continue; 1423 } 1424 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 1425 if (FDTy->isIncompleteType()) { 1426 if (!Record) { // Incomplete ivar type is always an error. 1427 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1428 FD->setInvalidDecl(); 1429 EnclosingDecl->setInvalidDecl(); 1430 continue; 1431 } 1432 if (i != NumFields-1 || // ... that the last member ... 1433 Record->getKind() != Decl::Struct || // ... of a structure ... 1434 !FDTy->isArrayType()) { //... may have incomplete array type. 1435 Diag(FD->getLocation(), diag::err_field_incomplete, FD->getName()); 1436 FD->setInvalidDecl(); 1437 EnclosingDecl->setInvalidDecl(); 1438 continue; 1439 } 1440 if (NumNamedMembers < 1) { //... must have more than named member ... 1441 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct, 1442 FD->getName()); 1443 FD->setInvalidDecl(); 1444 EnclosingDecl->setInvalidDecl(); 1445 continue; 1446 } 1447 // Okay, we have a legal flexible array member at the end of the struct. 1448 if (Record) 1449 Record->setHasFlexibleArrayMember(true); 1450 } 1451 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 1452 /// field of another structure or the element of an array. 1453 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 1454 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 1455 // If this is a member of a union, then entire union becomes "flexible". 1456 if (Record && Record->getKind() == Decl::Union) { 1457 Record->setHasFlexibleArrayMember(true); 1458 } else { 1459 // If this is a struct/class and this is not the last element, reject 1460 // it. Note that GCC supports variable sized arrays in the middle of 1461 // structures. 1462 if (i != NumFields-1) { 1463 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct, 1464 FD->getName()); 1465 FD->setInvalidDecl(); 1466 EnclosingDecl->setInvalidDecl(); 1467 continue; 1468 } 1469 // We support flexible arrays at the end of structs in other structs 1470 // as an extension. 1471 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct, 1472 FD->getName()); 1473 if (Record) 1474 Record->setHasFlexibleArrayMember(true); 1475 } 1476 } 1477 } 1478 /// A field cannot be an Objective-c object 1479 if (FDTy->isObjCInterfaceType()) { 1480 Diag(FD->getLocation(), diag::err_statically_allocated_object, 1481 FD->getName()); 1482 FD->setInvalidDecl(); 1483 EnclosingDecl->setInvalidDecl(); 1484 continue; 1485 } 1486 // Keep track of the number of named members. 1487 if (IdentifierInfo *II = FD->getIdentifier()) { 1488 // Detect duplicate member names. 1489 if (!FieldIDs.insert(II)) { 1490 Diag(FD->getLocation(), diag::err_duplicate_member, II->getName()); 1491 // Find the previous decl. 1492 SourceLocation PrevLoc; 1493 for (unsigned i = 0, e = RecFields.size(); ; ++i) { 1494 assert(i != e && "Didn't find previous def!"); 1495 if (RecFields[i]->getIdentifier() == II) { 1496 PrevLoc = RecFields[i]->getLocation(); 1497 break; 1498 } 1499 } 1500 Diag(PrevLoc, diag::err_previous_definition); 1501 FD->setInvalidDecl(); 1502 EnclosingDecl->setInvalidDecl(); 1503 continue; 1504 } 1505 ++NumNamedMembers; 1506 } 1507 } 1508 1509 // Okay, we successfully defined 'Record'. 1510 if (Record) { 1511 Record->defineBody(&RecFields[0], RecFields.size()); 1512 Consumer.HandleTagDeclDefinition(Record); 1513 } else { 1514 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 1515 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) 1516 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 1517 else if (ObjCImplementationDecl *IMPDecl = 1518 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 1519 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 1520 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 1521 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 1522 } 1523 } 1524} 1525 1526Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 1527 DeclTy *lastEnumConst, 1528 SourceLocation IdLoc, IdentifierInfo *Id, 1529 SourceLocation EqualLoc, ExprTy *val) { 1530 theEnumDecl = theEnumDecl; // silence unused warning. 1531 EnumConstantDecl *LastEnumConst = 1532 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 1533 Expr *Val = static_cast<Expr*>(val); 1534 1535 // The scope passed in may not be a decl scope. Zip up the scope tree until 1536 // we find one that is. 1537 while ((S->getFlags() & Scope::DeclScope) == 0) 1538 S = S->getParent(); 1539 1540 // Verify that there isn't already something declared with this name in this 1541 // scope. 1542 if (ScopedDecl *PrevDecl = LookupScopedDecl(Id, Decl::IDNS_Ordinary, 1543 IdLoc, S)) { 1544 if (S->isDeclScope(PrevDecl)) { 1545 if (isa<EnumConstantDecl>(PrevDecl)) 1546 Diag(IdLoc, diag::err_redefinition_of_enumerator, Id->getName()); 1547 else 1548 Diag(IdLoc, diag::err_redefinition, Id->getName()); 1549 Diag(PrevDecl->getLocation(), diag::err_previous_definition); 1550 delete Val; 1551 return 0; 1552 } 1553 } 1554 1555 llvm::APSInt EnumVal(32); 1556 QualType EltTy; 1557 if (Val) { 1558 // Make sure to promote the operand type to int. 1559 UsualUnaryConversions(Val); 1560 1561 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 1562 SourceLocation ExpLoc; 1563 if (!Val->isIntegerConstantExpr(EnumVal, Context, &ExpLoc)) { 1564 Diag(ExpLoc, diag::err_enum_value_not_integer_constant_expr, 1565 Id->getName()); 1566 delete Val; 1567 Val = 0; // Just forget about it. 1568 } else { 1569 EltTy = Val->getType(); 1570 } 1571 } 1572 1573 if (!Val) { 1574 if (LastEnumConst) { 1575 // Assign the last value + 1. 1576 EnumVal = LastEnumConst->getInitVal(); 1577 ++EnumVal; 1578 1579 // Check for overflow on increment. 1580 if (EnumVal < LastEnumConst->getInitVal()) 1581 Diag(IdLoc, diag::warn_enum_value_overflow); 1582 1583 EltTy = LastEnumConst->getType(); 1584 } else { 1585 // First value, set to zero. 1586 EltTy = Context.IntTy; 1587 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 1588 } 1589 } 1590 1591 EnumConstantDecl *New = 1592 EnumConstantDecl::Create(Context, IdLoc, Id, EltTy, Val, EnumVal, 1593 LastEnumConst); 1594 1595 // Register this decl in the current scope stack. 1596 New->setNext(Id->getFETokenInfo<ScopedDecl>()); 1597 Id->setFETokenInfo(New); 1598 S->AddDecl(New); 1599 return New; 1600} 1601 1602void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 1603 DeclTy **Elements, unsigned NumElements) { 1604 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 1605 assert(!Enum->isDefinition() && "Enum redefinitions can't reach here"); 1606 1607 // TODO: If the result value doesn't fit in an int, it must be a long or long 1608 // long value. ISO C does not support this, but GCC does as an extension, 1609 // emit a warning. 1610 unsigned IntWidth = Context.Target.getIntWidth(); 1611 1612 // Verify that all the values are okay, compute the size of the values, and 1613 // reverse the list. 1614 unsigned NumNegativeBits = 0; 1615 unsigned NumPositiveBits = 0; 1616 1617 // Keep track of whether all elements have type int. 1618 bool AllElementsInt = true; 1619 1620 EnumConstantDecl *EltList = 0; 1621 for (unsigned i = 0; i != NumElements; ++i) { 1622 EnumConstantDecl *ECD = 1623 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1624 if (!ECD) continue; // Already issued a diagnostic. 1625 1626 // If the enum value doesn't fit in an int, emit an extension warning. 1627 const llvm::APSInt &InitVal = ECD->getInitVal(); 1628 assert(InitVal.getBitWidth() >= IntWidth && 1629 "Should have promoted value to int"); 1630 if (InitVal.getBitWidth() > IntWidth) { 1631 llvm::APSInt V(InitVal); 1632 V.trunc(IntWidth); 1633 V.extend(InitVal.getBitWidth()); 1634 if (V != InitVal) 1635 Diag(ECD->getLocation(), diag::ext_enum_value_not_int, 1636 InitVal.toString()); 1637 } 1638 1639 // Keep track of the size of positive and negative values. 1640 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 1641 NumPositiveBits = std::max(NumPositiveBits, 1642 (unsigned)InitVal.getActiveBits()); 1643 else 1644 NumNegativeBits = std::max(NumNegativeBits, 1645 (unsigned)InitVal.getMinSignedBits()); 1646 1647 // Keep track of whether every enum element has type int (very commmon). 1648 if (AllElementsInt) 1649 AllElementsInt = ECD->getType() == Context.IntTy; 1650 1651 ECD->setNextDeclarator(EltList); 1652 EltList = ECD; 1653 } 1654 1655 // Figure out the type that should be used for this enum. 1656 // FIXME: Support attribute(packed) on enums and -fshort-enums. 1657 QualType BestType; 1658 unsigned BestWidth; 1659 1660 if (NumNegativeBits) { 1661 // If there is a negative value, figure out the smallest integer type (of 1662 // int/long/longlong) that fits. 1663 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 1664 BestType = Context.IntTy; 1665 BestWidth = IntWidth; 1666 } else { 1667 BestWidth = Context.Target.getLongWidth(); 1668 1669 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 1670 BestType = Context.LongTy; 1671 else { 1672 BestWidth = Context.Target.getLongLongWidth(); 1673 1674 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 1675 Diag(Enum->getLocation(), diag::warn_enum_too_large); 1676 BestType = Context.LongLongTy; 1677 } 1678 } 1679 } else { 1680 // If there is no negative value, figure out which of uint, ulong, ulonglong 1681 // fits. 1682 if (NumPositiveBits <= IntWidth) { 1683 BestType = Context.UnsignedIntTy; 1684 BestWidth = IntWidth; 1685 } else if (NumPositiveBits <= 1686 (BestWidth = Context.Target.getLongWidth())) { 1687 BestType = Context.UnsignedLongTy; 1688 } else { 1689 BestWidth = Context.Target.getLongLongWidth(); 1690 assert(NumPositiveBits <= BestWidth && 1691 "How could an initializer get larger than ULL?"); 1692 BestType = Context.UnsignedLongLongTy; 1693 } 1694 } 1695 1696 // Loop over all of the enumerator constants, changing their types to match 1697 // the type of the enum if needed. 1698 for (unsigned i = 0; i != NumElements; ++i) { 1699 EnumConstantDecl *ECD = 1700 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 1701 if (!ECD) continue; // Already issued a diagnostic. 1702 1703 // Standard C says the enumerators have int type, but we allow, as an 1704 // extension, the enumerators to be larger than int size. If each 1705 // enumerator value fits in an int, type it as an int, otherwise type it the 1706 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 1707 // that X has type 'int', not 'unsigned'. 1708 if (ECD->getType() == Context.IntTy) { 1709 // Make sure the init value is signed. 1710 llvm::APSInt IV = ECD->getInitVal(); 1711 IV.setIsSigned(true); 1712 ECD->setInitVal(IV); 1713 continue; // Already int type. 1714 } 1715 1716 // Determine whether the value fits into an int. 1717 llvm::APSInt InitVal = ECD->getInitVal(); 1718 bool FitsInInt; 1719 if (InitVal.isUnsigned() || !InitVal.isNegative()) 1720 FitsInInt = InitVal.getActiveBits() < IntWidth; 1721 else 1722 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 1723 1724 // If it fits into an integer type, force it. Otherwise force it to match 1725 // the enum decl type. 1726 QualType NewTy; 1727 unsigned NewWidth; 1728 bool NewSign; 1729 if (FitsInInt) { 1730 NewTy = Context.IntTy; 1731 NewWidth = IntWidth; 1732 NewSign = true; 1733 } else if (ECD->getType() == BestType) { 1734 // Already the right type! 1735 continue; 1736 } else { 1737 NewTy = BestType; 1738 NewWidth = BestWidth; 1739 NewSign = BestType->isSignedIntegerType(); 1740 } 1741 1742 // Adjust the APSInt value. 1743 InitVal.extOrTrunc(NewWidth); 1744 InitVal.setIsSigned(NewSign); 1745 ECD->setInitVal(InitVal); 1746 1747 // Adjust the Expr initializer and type. 1748 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr())); 1749 ECD->setType(NewTy); 1750 } 1751 1752 Enum->defineElements(EltList, BestType); 1753 Consumer.HandleTagDeclDefinition(Enum); 1754} 1755 1756Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 1757 ExprTy *expr) { 1758 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr); 1759 1760 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 1761} 1762 1763Sema::DeclTy* Sema::ActOnLinkageSpec(SourceLocation Loc, 1764 SourceLocation LBrace, 1765 SourceLocation RBrace, 1766 const char *Lang, 1767 unsigned StrSize, 1768 DeclTy *D) { 1769 LinkageSpecDecl::LanguageIDs Language; 1770 Decl *dcl = static_cast<Decl *>(D); 1771 if (strncmp(Lang, "\"C\"", StrSize) == 0) 1772 Language = LinkageSpecDecl::lang_c; 1773 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 1774 Language = LinkageSpecDecl::lang_cxx; 1775 else { 1776 Diag(Loc, diag::err_bad_language); 1777 return 0; 1778 } 1779 1780 // FIXME: Add all the various semantics of linkage specifications 1781 return LinkageSpecDecl::Create(Context, Loc, Language, dcl); 1782} 1783 1784void Sema::HandleDeclAttribute(Decl *New, AttributeList *Attr) { 1785 1786 switch (Attr->getKind()) { 1787 case AttributeList::AT_vector_size: 1788 if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1789 QualType newType = HandleVectorTypeAttribute(vDecl->getType(), Attr); 1790 if (!newType.isNull()) // install the new vector type into the decl 1791 vDecl->setType(newType); 1792 } 1793 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1794 QualType newType = HandleVectorTypeAttribute(tDecl->getUnderlyingType(), 1795 Attr); 1796 if (!newType.isNull()) // install the new vector type into the decl 1797 tDecl->setUnderlyingType(newType); 1798 } 1799 break; 1800 case AttributeList::AT_ocu_vector_type: 1801 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) 1802 HandleOCUVectorTypeAttribute(tDecl, Attr); 1803 else 1804 Diag(Attr->getLoc(), 1805 diag::err_typecheck_ocu_vector_not_typedef); 1806 break; 1807 case AttributeList::AT_address_space: 1808 if (TypedefDecl *tDecl = dyn_cast<TypedefDecl>(New)) { 1809 QualType newType = HandleAddressSpaceTypeAttribute( 1810 tDecl->getUnderlyingType(), 1811 Attr); 1812 tDecl->setUnderlyingType(newType); 1813 } else if (ValueDecl *vDecl = dyn_cast<ValueDecl>(New)) { 1814 QualType newType = HandleAddressSpaceTypeAttribute(vDecl->getType(), 1815 Attr); 1816 // install the new addr spaced type into the decl 1817 vDecl->setType(newType); 1818 } 1819 break; 1820 case AttributeList::AT_deprecated: 1821 HandleDeprecatedAttribute(New, Attr); 1822 break; 1823 case AttributeList::AT_visibility: 1824 HandleVisibilityAttribute(New, Attr); 1825 break; 1826 case AttributeList::AT_weak: 1827 HandleWeakAttribute(New, Attr); 1828 break; 1829 case AttributeList::AT_dllimport: 1830 HandleDLLImportAttribute(New, Attr); 1831 break; 1832 case AttributeList::AT_dllexport: 1833 HandleDLLExportAttribute(New, Attr); 1834 break; 1835 case AttributeList::AT_nothrow: 1836 HandleNothrowAttribute(New, Attr); 1837 break; 1838 case AttributeList::AT_stdcall: 1839 HandleStdCallAttribute(New, Attr); 1840 break; 1841 case AttributeList::AT_fastcall: 1842 HandleFastCallAttribute(New, Attr); 1843 break; 1844 case AttributeList::AT_aligned: 1845 HandleAlignedAttribute(New, Attr); 1846 break; 1847 case AttributeList::AT_packed: 1848 HandlePackedAttribute(New, Attr); 1849 break; 1850 case AttributeList::AT_annotate: 1851 HandleAnnotateAttribute(New, Attr); 1852 break; 1853 case AttributeList::AT_noreturn: 1854 HandleNoReturnAttribute(New, Attr); 1855 break; 1856 case AttributeList::AT_format: 1857 HandleFormatAttribute(New, Attr); 1858 break; 1859 default: 1860#if 0 1861 // TODO: when we have the full set of attributes, warn about unknown ones. 1862 Diag(Attr->getLoc(), diag::warn_attribute_ignored, 1863 Attr->getName()->getName()); 1864#endif 1865 break; 1866 } 1867} 1868 1869void Sema::HandleDeclAttributes(Decl *New, AttributeList *declspec_prefix, 1870 AttributeList *declarator_postfix) { 1871 while (declspec_prefix) { 1872 HandleDeclAttribute(New, declspec_prefix); 1873 declspec_prefix = declspec_prefix->getNext(); 1874 } 1875 while (declarator_postfix) { 1876 HandleDeclAttribute(New, declarator_postfix); 1877 declarator_postfix = declarator_postfix->getNext(); 1878 } 1879} 1880 1881void Sema::HandleOCUVectorTypeAttribute(TypedefDecl *tDecl, 1882 AttributeList *rawAttr) { 1883 QualType curType = tDecl->getUnderlyingType(); 1884 // check the attribute arguments. 1885 if (rawAttr->getNumArgs() != 1) { 1886 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1887 std::string("1")); 1888 return; 1889 } 1890 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1891 llvm::APSInt vecSize(32); 1892 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1893 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1894 "ocu_vector_type", sizeExpr->getSourceRange()); 1895 return; 1896 } 1897 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1898 // in conjunction with complex types (pointers, arrays, functions, etc.). 1899 Type *canonType = curType.getCanonicalType().getTypePtr(); 1900 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1901 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1902 curType.getCanonicalType().getAsString()); 1903 return; 1904 } 1905 // unlike gcc's vector_size attribute, the size is specified as the 1906 // number of elements, not the number of bytes. 1907 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1908 1909 if (vectorSize == 0) { 1910 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1911 sizeExpr->getSourceRange()); 1912 return; 1913 } 1914 // Instantiate/Install the vector type, the number of elements is > 0. 1915 tDecl->setUnderlyingType(Context.getOCUVectorType(curType, vectorSize)); 1916 // Remember this typedef decl, we will need it later for diagnostics. 1917 OCUVectorDecls.push_back(tDecl); 1918} 1919 1920QualType Sema::HandleVectorTypeAttribute(QualType curType, 1921 AttributeList *rawAttr) { 1922 // check the attribute arugments. 1923 if (rawAttr->getNumArgs() != 1) { 1924 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1925 std::string("1")); 1926 return QualType(); 1927 } 1928 Expr *sizeExpr = static_cast<Expr *>(rawAttr->getArg(0)); 1929 llvm::APSInt vecSize(32); 1930 if (!sizeExpr->isIntegerConstantExpr(vecSize, Context)) { 1931 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 1932 "vector_size", sizeExpr->getSourceRange()); 1933 return QualType(); 1934 } 1935 // navigate to the base type - we need to provide for vector pointers, 1936 // vector arrays, and functions returning vectors. 1937 Type *canonType = curType.getCanonicalType().getTypePtr(); 1938 1939 if (canonType->isPointerType() || canonType->isArrayType() || 1940 canonType->isFunctionType()) { 1941 assert(0 && "HandleVector(): Complex type construction unimplemented"); 1942 /* FIXME: rebuild the type from the inside out, vectorizing the inner type. 1943 do { 1944 if (PointerType *PT = dyn_cast<PointerType>(canonType)) 1945 canonType = PT->getPointeeType().getTypePtr(); 1946 else if (ArrayType *AT = dyn_cast<ArrayType>(canonType)) 1947 canonType = AT->getElementType().getTypePtr(); 1948 else if (FunctionType *FT = dyn_cast<FunctionType>(canonType)) 1949 canonType = FT->getResultType().getTypePtr(); 1950 } while (canonType->isPointerType() || canonType->isArrayType() || 1951 canonType->isFunctionType()); 1952 */ 1953 } 1954 // the base type must be integer or float. 1955 if (!(canonType->isIntegerType() || canonType->isRealFloatingType())) { 1956 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_vector_type, 1957 curType.getCanonicalType().getAsString()); 1958 return QualType(); 1959 } 1960 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(curType)); 1961 // vecSize is specified in bytes - convert to bits. 1962 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1963 1964 // the vector size needs to be an integral multiple of the type size. 1965 if (vectorSize % typeSize) { 1966 Diag(rawAttr->getLoc(), diag::err_attribute_invalid_size, 1967 sizeExpr->getSourceRange()); 1968 return QualType(); 1969 } 1970 if (vectorSize == 0) { 1971 Diag(rawAttr->getLoc(), diag::err_attribute_zero_size, 1972 sizeExpr->getSourceRange()); 1973 return QualType(); 1974 } 1975 // Instantiate the vector type, the number of elements is > 0, and not 1976 // required to be a power of 2, unlike GCC. 1977 return Context.getVectorType(curType, vectorSize/typeSize); 1978} 1979 1980void Sema::HandlePackedAttribute(Decl *d, AttributeList *rawAttr) { 1981 // check the attribute arguments. 1982 if (rawAttr->getNumArgs() > 0) { 1983 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 1984 std::string("0")); 1985 return; 1986 } 1987 1988 if (TagDecl *TD = dyn_cast<TagDecl>(d)) 1989 TD->addAttr(new PackedAttr); 1990 else if (FieldDecl *FD = dyn_cast<FieldDecl>(d)) { 1991 // If the alignment is less than or equal to 8 bits, the packed attribute 1992 // has no effect. 1993 if (Context.getTypeAlign(FD->getType()) <= 8) 1994 Diag(rawAttr->getLoc(), 1995 diag::warn_attribute_ignored_for_field_of_type, 1996 rawAttr->getName()->getName(), FD->getType().getAsString()); 1997 else 1998 FD->addAttr(new PackedAttr); 1999 } else 2000 Diag(rawAttr->getLoc(), diag::warn_attribute_ignored, 2001 rawAttr->getName()->getName()); 2002} 2003 2004void Sema::HandleNoReturnAttribute(Decl *d, AttributeList *rawAttr) { 2005 // check the attribute arguments. 2006 if (rawAttr->getNumArgs() != 0) { 2007 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2008 std::string("0")); 2009 return; 2010 } 2011 2012 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2013 2014 if (!Fn) { 2015 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2016 "noreturn", "function"); 2017 return; 2018 } 2019 2020 d->addAttr(new NoReturnAttr()); 2021} 2022 2023void Sema::HandleDeprecatedAttribute(Decl *d, AttributeList *rawAttr) { 2024 // check the attribute arguments. 2025 if (rawAttr->getNumArgs() != 0) { 2026 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2027 std::string("0")); 2028 return; 2029 } 2030 2031 d->addAttr(new DeprecatedAttr()); 2032} 2033 2034void Sema::HandleVisibilityAttribute(Decl *d, AttributeList *rawAttr) { 2035 // check the attribute arguments. 2036 if (rawAttr->getNumArgs() != 1) { 2037 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2038 std::string("1")); 2039 return; 2040 } 2041 2042 Expr *Arg = static_cast<Expr*>(rawAttr->getArg(0)); 2043 Arg = Arg->IgnoreParenCasts(); 2044 StringLiteral *Str = dyn_cast<StringLiteral>(Arg); 2045 2046 if (Str == 0 || Str->isWide()) { 2047 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2048 "visibility", std::string("1")); 2049 return; 2050 } 2051 2052 const char *TypeStr = Str->getStrData(); 2053 unsigned TypeLen = Str->getByteLength(); 2054 llvm::GlobalValue::VisibilityTypes type; 2055 2056 if (TypeLen == 7 && !memcmp(TypeStr, "default", 7)) 2057 type = llvm::GlobalValue::DefaultVisibility; 2058 else if (TypeLen == 6 && !memcmp(TypeStr, "hidden", 6)) 2059 type = llvm::GlobalValue::HiddenVisibility; 2060 else if (TypeLen == 8 && !memcmp(TypeStr, "internal", 8)) 2061 type = llvm::GlobalValue::HiddenVisibility; // FIXME 2062 else if (TypeLen == 9 && !memcmp(TypeStr, "protected", 9)) 2063 type = llvm::GlobalValue::ProtectedVisibility; 2064 else { 2065 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2066 "visibility", TypeStr); 2067 return; 2068 } 2069 2070 d->addAttr(new VisibilityAttr(type)); 2071} 2072 2073void Sema::HandleWeakAttribute(Decl *d, AttributeList *rawAttr) { 2074 // check the attribute arguments. 2075 if (rawAttr->getNumArgs() != 0) { 2076 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2077 std::string("0")); 2078 return; 2079 } 2080 2081 d->addAttr(new WeakAttr()); 2082} 2083 2084void Sema::HandleDLLImportAttribute(Decl *d, AttributeList *rawAttr) { 2085 // check the attribute arguments. 2086 if (rawAttr->getNumArgs() != 0) { 2087 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2088 std::string("0")); 2089 return; 2090 } 2091 2092 d->addAttr(new DLLImportAttr()); 2093} 2094 2095void Sema::HandleDLLExportAttribute(Decl *d, AttributeList *rawAttr) { 2096 // check the attribute arguments. 2097 if (rawAttr->getNumArgs() != 0) { 2098 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2099 std::string("0")); 2100 return; 2101 } 2102 2103 d->addAttr(new DLLExportAttr()); 2104} 2105 2106void Sema::HandleStdCallAttribute(Decl *d, AttributeList *rawAttr) { 2107 // check the attribute arguments. 2108 if (rawAttr->getNumArgs() != 0) { 2109 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2110 std::string("0")); 2111 return; 2112 } 2113 2114 d->addAttr(new StdCallAttr()); 2115} 2116 2117void Sema::HandleFastCallAttribute(Decl *d, AttributeList *rawAttr) { 2118 // check the attribute arguments. 2119 if (rawAttr->getNumArgs() != 0) { 2120 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2121 std::string("0")); 2122 return; 2123 } 2124 2125 d->addAttr(new FastCallAttr()); 2126} 2127 2128void Sema::HandleNothrowAttribute(Decl *d, AttributeList *rawAttr) { 2129 // check the attribute arguments. 2130 if (rawAttr->getNumArgs() != 0) { 2131 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2132 std::string("0")); 2133 return; 2134 } 2135 2136 d->addAttr(new NoThrowAttr()); 2137} 2138 2139/// Handle __attribute__((format(type,idx,firstarg))) attributes 2140/// based on http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 2141void Sema::HandleFormatAttribute(Decl *d, AttributeList *rawAttr) { 2142 2143 if (!rawAttr->getParameterName()) { 2144 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_string, 2145 "format", std::string("1")); 2146 return; 2147 } 2148 2149 if (rawAttr->getNumArgs() != 2) { 2150 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2151 std::string("3")); 2152 return; 2153 } 2154 2155 FunctionDecl *Fn = dyn_cast<FunctionDecl>(d); 2156 if (!Fn) { 2157 Diag(rawAttr->getLoc(), diag::warn_attribute_wrong_decl_type, 2158 "format", "function"); 2159 return; 2160 } 2161 2162 const FunctionTypeProto *proto = 2163 dyn_cast<FunctionTypeProto>(Fn->getType()->getAsFunctionType()); 2164 if (!proto) 2165 return; 2166 2167 // FIXME: in C++ the implicit 'this' function parameter also counts. 2168 // this is needed in order to be compatible with GCC 2169 // the index must start in 1 and the limit is numargs+1 2170 unsigned NumArgs = Fn->getNumParams(); 2171 unsigned FirstIdx = 1; 2172 2173 const char *Format = rawAttr->getParameterName()->getName(); 2174 unsigned FormatLen = rawAttr->getParameterName()->getLength(); 2175 2176 // Normalize the argument, __foo__ becomes foo. 2177 if (FormatLen > 4 && Format[0] == '_' && Format[1] == '_' && 2178 Format[FormatLen - 2] == '_' && Format[FormatLen - 1] == '_') { 2179 Format += 2; 2180 FormatLen -= 4; 2181 } 2182 2183 if (!((FormatLen == 5 && !memcmp(Format, "scanf", 5)) 2184 || (FormatLen == 6 && !memcmp(Format, "printf", 6)) 2185 || (FormatLen == 7 && !memcmp(Format, "strfmon", 7)) 2186 || (FormatLen == 8 && !memcmp(Format, "strftime", 8)))) { 2187 Diag(rawAttr->getLoc(), diag::warn_attribute_type_not_supported, 2188 "format", rawAttr->getParameterName()->getName()); 2189 return; 2190 } 2191 2192 // checks for the 2nd argument 2193 Expr *IdxExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2194 llvm::APSInt Idx(Context.getTypeSize(IdxExpr->getType())); 2195 if (!IdxExpr->isIntegerConstantExpr(Idx, Context)) { 2196 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2197 "format", std::string("2"), IdxExpr->getSourceRange()); 2198 return; 2199 } 2200 2201 if (Idx.getZExtValue() < FirstIdx || Idx.getZExtValue() > NumArgs) { 2202 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2203 "format", std::string("2"), IdxExpr->getSourceRange()); 2204 return; 2205 } 2206 2207 // make sure the format string is really a string 2208 QualType Ty = proto->getArgType(Idx.getZExtValue()-1); 2209 if (!Ty->isPointerType() || 2210 !Ty->getAsPointerType()->getPointeeType()->isCharType()) { 2211 Diag(rawAttr->getLoc(), diag::err_format_attribute_not_string, 2212 IdxExpr->getSourceRange()); 2213 return; 2214 } 2215 2216 2217 // check the 3rd argument 2218 Expr *FirstArgExpr = static_cast<Expr *>(rawAttr->getArg(1)); 2219 llvm::APSInt FirstArg(Context.getTypeSize(FirstArgExpr->getType())); 2220 if (!FirstArgExpr->isIntegerConstantExpr(FirstArg, Context)) { 2221 Diag(rawAttr->getLoc(), diag::err_attribute_argument_n_not_int, 2222 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2223 return; 2224 } 2225 2226 // check if the function is variadic if the 3rd argument non-zero 2227 if (FirstArg != 0) { 2228 if (proto->isVariadic()) { 2229 ++NumArgs; // +1 for ... 2230 } else { 2231 Diag(d->getLocation(), diag::err_format_attribute_requires_variadic); 2232 return; 2233 } 2234 } 2235 2236 // strftime requires FirstArg to be 0 because it doesn't read from any variable 2237 // the input is just the current time + the format string 2238 if (FormatLen == 8 && !memcmp(Format, "strftime", 8)) { 2239 if (FirstArg != 0) { 2240 Diag(rawAttr->getLoc(), diag::err_format_strftime_third_parameter, 2241 FirstArgExpr->getSourceRange()); 2242 return; 2243 } 2244 // if 0 it disables parameter checking (to use with e.g. va_list) 2245 } else if (FirstArg != 0 && FirstArg != NumArgs) { 2246 Diag(rawAttr->getLoc(), diag::err_attribute_argument_out_of_bounds, 2247 "format", std::string("3"), FirstArgExpr->getSourceRange()); 2248 return; 2249 } 2250 2251 d->addAttr(new FormatAttr(std::string(Format, FormatLen), 2252 Idx.getZExtValue(), FirstArg.getZExtValue())); 2253} 2254 2255void Sema::HandleAnnotateAttribute(Decl *d, AttributeList *rawAttr) { 2256 // check the attribute arguments. 2257 if (rawAttr->getNumArgs() != 1) { 2258 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2259 std::string("1")); 2260 return; 2261 } 2262 Expr *argExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2263 StringLiteral *SE = dyn_cast<StringLiteral>(argExpr); 2264 2265 // Make sure that there is a string literal as the annotation's single 2266 // argument. 2267 if (!SE) { 2268 Diag(rawAttr->getLoc(), diag::err_attribute_annotate_no_string); 2269 return; 2270 } 2271 d->addAttr(new AnnotateAttr(std::string(SE->getStrData(), 2272 SE->getByteLength()))); 2273} 2274 2275void Sema::HandleAlignedAttribute(Decl *d, AttributeList *rawAttr) 2276{ 2277 // check the attribute arguments. 2278 if (rawAttr->getNumArgs() > 1) { 2279 Diag(rawAttr->getLoc(), diag::err_attribute_wrong_number_arguments, 2280 std::string("1")); 2281 return; 2282 } 2283 2284 unsigned Align = 0; 2285 2286 if (rawAttr->getNumArgs() == 0) { 2287 // FIXME: This should be the target specific maximum alignment. 2288 // (For now we just use 128 bits which is the maximum on X86. 2289 Align = 128; 2290 return; 2291 } else { 2292 Expr *alignmentExpr = static_cast<Expr *>(rawAttr->getArg(0)); 2293 llvm::APSInt alignment(32); 2294 if (!alignmentExpr->isIntegerConstantExpr(alignment, Context)) { 2295 Diag(rawAttr->getLoc(), diag::err_attribute_argument_not_int, 2296 "aligned", alignmentExpr->getSourceRange()); 2297 return; 2298 } 2299 2300 Align = alignment.getZExtValue() * 8; 2301 } 2302 2303 d->addAttr(new AlignedAttr(Align)); 2304} 2305