SemaExpr.cpp revision cf13d4ad85bceb69c8dfb2fc9f2b4276ccd3a130
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 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 expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29 30/// \brief Determine whether the use of this declaration is valid, and 31/// emit any corresponding diagnostics. 32/// 33/// This routine diagnoses various problems with referencing 34/// declarations that can occur when using a declaration. For example, 35/// it might warn if a deprecated or unavailable declaration is being 36/// used, or produce an error (and return true) if a C++0x deleted 37/// function is being used. 38/// 39/// \returns true if there was an error (this declaration cannot be 40/// referenced), false otherwise. 41bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 42 // See if the decl is deprecated. 43 if (D->getAttr<DeprecatedAttr>()) { 44 // Implementing deprecated stuff requires referencing deprecated 45 // stuff. Don't warn if we are implementing a deprecated 46 // construct. 47 bool isSilenced = false; 48 49 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 50 // If this reference happens *in* a deprecated function or method, don't 51 // warn. 52 isSilenced = ND->getAttr<DeprecatedAttr>(); 53 54 // If this is an Objective-C method implementation, check to see if the 55 // method was deprecated on the declaration, not the definition. 56 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 57 // The semantic decl context of a ObjCMethodDecl is the 58 // ObjCImplementationDecl. 59 if (ObjCImplementationDecl *Impl 60 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 61 62 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 63 MD->isInstanceMethod()); 64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 65 } 66 } 67 } 68 69 if (!isSilenced) 70 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 71 } 72 73 // See if this is a deleted function. 74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 75 if (FD->isDeleted()) { 76 Diag(Loc, diag::err_deleted_function_use); 77 Diag(D->getLocation(), diag::note_unavailable_here) << true; 78 return true; 79 } 80 } 81 82 // See if the decl is unavailable 83 if (D->getAttr<UnavailableAttr>()) { 84 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 85 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 86 } 87 88 return false; 89} 90 91/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 92/// (and other functions in future), which have been declared with sentinel 93/// attribute. It warns if call does not have the sentinel argument. 94/// 95void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 96 Expr **Args, unsigned NumArgs) 97{ 98 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 99 if (!attr) 100 return; 101 int sentinelPos = attr->getSentinel(); 102 int nullPos = attr->getNullPos(); 103 104 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 105 // base class. Then we won't be needing two versions of the same code. 106 unsigned int i = 0; 107 bool warnNotEnoughArgs = false; 108 int isMethod = 0; 109 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 110 // skip over named parameters. 111 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 112 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 113 if (nullPos) 114 --nullPos; 115 else 116 ++i; 117 } 118 warnNotEnoughArgs = (P != E || i >= NumArgs); 119 isMethod = 1; 120 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 121 // skip over named parameters. 122 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 123 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 124 if (nullPos) 125 --nullPos; 126 else 127 ++i; 128 } 129 warnNotEnoughArgs = (P != E || i >= NumArgs); 130 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 131 // block or function pointer call. 132 QualType Ty = V->getType(); 133 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 134 const FunctionType *FT = Ty->isFunctionPointerType() 135 ? Ty->getAs<PointerType>()->getPointeeType()->getAsFunctionType() 136 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAsFunctionType(); 137 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 138 unsigned NumArgsInProto = Proto->getNumArgs(); 139 unsigned k; 140 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 141 if (nullPos) 142 --nullPos; 143 else 144 ++i; 145 } 146 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 147 } 148 if (Ty->isBlockPointerType()) 149 isMethod = 2; 150 } else 151 return; 152 } else 153 return; 154 155 if (warnNotEnoughArgs) { 156 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 157 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 158 return; 159 } 160 int sentinel = i; 161 while (sentinelPos > 0 && i < NumArgs-1) { 162 --sentinelPos; 163 ++i; 164 } 165 if (sentinelPos > 0) { 166 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 167 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 168 return; 169 } 170 while (i < NumArgs-1) { 171 ++i; 172 ++sentinel; 173 } 174 Expr *sentinelExpr = Args[sentinel]; 175 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 176 !sentinelExpr->isNullPointerConstant(Context))) { 177 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 178 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 179 } 180 return; 181} 182 183SourceRange Sema::getExprRange(ExprTy *E) const { 184 Expr *Ex = (Expr *)E; 185 return Ex? Ex->getSourceRange() : SourceRange(); 186} 187 188//===----------------------------------------------------------------------===// 189// Standard Promotions and Conversions 190//===----------------------------------------------------------------------===// 191 192/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 193void Sema::DefaultFunctionArrayConversion(Expr *&E) { 194 QualType Ty = E->getType(); 195 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 196 197 if (Ty->isFunctionType()) 198 ImpCastExprToType(E, Context.getPointerType(Ty)); 199 else if (Ty->isArrayType()) { 200 // In C90 mode, arrays only promote to pointers if the array expression is 201 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 202 // type 'array of type' is converted to an expression that has type 'pointer 203 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 204 // that has type 'array of type' ...". The relevant change is "an lvalue" 205 // (C90) to "an expression" (C99). 206 // 207 // C++ 4.2p1: 208 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 209 // T" can be converted to an rvalue of type "pointer to T". 210 // 211 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 212 E->isLvalue(Context) == Expr::LV_Valid) 213 ImpCastExprToType(E, Context.getArrayDecayedType(Ty), 214 CastExpr::CK_ArrayToPointerDecay); 215 } 216} 217 218/// UsualUnaryConversions - Performs various conversions that are common to most 219/// operators (C99 6.3). The conversions of array and function types are 220/// sometimes surpressed. For example, the array->pointer conversion doesn't 221/// apply if the array is an argument to the sizeof or address (&) operators. 222/// In these instances, this routine should *not* be called. 223Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 224 QualType Ty = Expr->getType(); 225 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 226 227 // C99 6.3.1.1p2: 228 // 229 // The following may be used in an expression wherever an int or 230 // unsigned int may be used: 231 // - an object or expression with an integer type whose integer 232 // conversion rank is less than or equal to the rank of int 233 // and unsigned int. 234 // - A bit-field of type _Bool, int, signed int, or unsigned int. 235 // 236 // If an int can represent all values of the original type, the 237 // value is converted to an int; otherwise, it is converted to an 238 // unsigned int. These are called the integer promotions. All 239 // other types are unchanged by the integer promotions. 240 QualType PTy = Context.isPromotableBitField(Expr); 241 if (!PTy.isNull()) { 242 ImpCastExprToType(Expr, PTy); 243 return Expr; 244 } 245 if (Ty->isPromotableIntegerType()) { 246 QualType PT = Context.getPromotedIntegerType(Ty); 247 ImpCastExprToType(Expr, PT); 248 return Expr; 249 } 250 251 DefaultFunctionArrayConversion(Expr); 252 return Expr; 253} 254 255/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 256/// do not have a prototype. Arguments that have type float are promoted to 257/// double. All other argument types are converted by UsualUnaryConversions(). 258void Sema::DefaultArgumentPromotion(Expr *&Expr) { 259 QualType Ty = Expr->getType(); 260 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 261 262 // If this is a 'float' (CVR qualified or typedef) promote to double. 263 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 264 if (BT->getKind() == BuiltinType::Float) 265 return ImpCastExprToType(Expr, Context.DoubleTy); 266 267 UsualUnaryConversions(Expr); 268} 269 270/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 271/// will warn if the resulting type is not a POD type, and rejects ObjC 272/// interfaces passed by value. This returns true if the argument type is 273/// completely illegal. 274bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 275 DefaultArgumentPromotion(Expr); 276 277 if (Expr->getType()->isObjCInterfaceType()) { 278 Diag(Expr->getLocStart(), 279 diag::err_cannot_pass_objc_interface_to_vararg) 280 << Expr->getType() << CT; 281 return true; 282 } 283 284 if (!Expr->getType()->isPODType()) 285 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 286 << Expr->getType() << CT; 287 288 return false; 289} 290 291 292/// UsualArithmeticConversions - Performs various conversions that are common to 293/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 294/// routine returns the first non-arithmetic type found. The client is 295/// responsible for emitting appropriate error diagnostics. 296/// FIXME: verify the conversion rules for "complex int" are consistent with 297/// GCC. 298QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 299 bool isCompAssign) { 300 if (!isCompAssign) 301 UsualUnaryConversions(lhsExpr); 302 303 UsualUnaryConversions(rhsExpr); 304 305 // For conversion purposes, we ignore any qualifiers. 306 // For example, "const float" and "float" are equivalent. 307 QualType lhs = 308 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 309 QualType rhs = 310 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 311 312 // If both types are identical, no conversion is needed. 313 if (lhs == rhs) 314 return lhs; 315 316 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 317 // The caller can deal with this (e.g. pointer + int). 318 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 319 return lhs; 320 321 // Perform bitfield promotions. 322 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr); 323 if (!LHSBitfieldPromoteTy.isNull()) 324 lhs = LHSBitfieldPromoteTy; 325 QualType RHSBitfieldPromoteTy = Context.isPromotableBitField(rhsExpr); 326 if (!RHSBitfieldPromoteTy.isNull()) 327 rhs = RHSBitfieldPromoteTy; 328 329 QualType destType = Context.UsualArithmeticConversionsType(lhs, rhs); 330 if (!isCompAssign) 331 ImpCastExprToType(lhsExpr, destType); 332 ImpCastExprToType(rhsExpr, destType); 333 return destType; 334} 335 336//===----------------------------------------------------------------------===// 337// Semantic Analysis for various Expression Types 338//===----------------------------------------------------------------------===// 339 340 341/// ActOnStringLiteral - The specified tokens were lexed as pasted string 342/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 343/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 344/// multiple tokens. However, the common case is that StringToks points to one 345/// string. 346/// 347Action::OwningExprResult 348Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 349 assert(NumStringToks && "Must have at least one string!"); 350 351 StringLiteralParser Literal(StringToks, NumStringToks, PP); 352 if (Literal.hadError) 353 return ExprError(); 354 355 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 356 for (unsigned i = 0; i != NumStringToks; ++i) 357 StringTokLocs.push_back(StringToks[i].getLocation()); 358 359 QualType StrTy = Context.CharTy; 360 if (Literal.AnyWide) StrTy = Context.getWCharType(); 361 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 362 363 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 364 if (getLangOptions().CPlusPlus) 365 StrTy.addConst(); 366 367 // Get an array type for the string, according to C99 6.4.5. This includes 368 // the nul terminator character as well as the string length for pascal 369 // strings. 370 StrTy = Context.getConstantArrayType(StrTy, 371 llvm::APInt(32, Literal.GetNumStringChars()+1), 372 ArrayType::Normal, 0); 373 374 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 375 return Owned(StringLiteral::Create(Context, Literal.GetString(), 376 Literal.GetStringLength(), 377 Literal.AnyWide, StrTy, 378 &StringTokLocs[0], 379 StringTokLocs.size())); 380} 381 382/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 383/// CurBlock to VD should cause it to be snapshotted (as we do for auto 384/// variables defined outside the block) or false if this is not needed (e.g. 385/// for values inside the block or for globals). 386/// 387/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 388/// up-to-date. 389/// 390static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 391 ValueDecl *VD) { 392 // If the value is defined inside the block, we couldn't snapshot it even if 393 // we wanted to. 394 if (CurBlock->TheDecl == VD->getDeclContext()) 395 return false; 396 397 // If this is an enum constant or function, it is constant, don't snapshot. 398 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 399 return false; 400 401 // If this is a reference to an extern, static, or global variable, no need to 402 // snapshot it. 403 // FIXME: What about 'const' variables in C++? 404 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 405 if (!Var->hasLocalStorage()) 406 return false; 407 408 // Blocks that have these can't be constant. 409 CurBlock->hasBlockDeclRefExprs = true; 410 411 // If we have nested blocks, the decl may be declared in an outer block (in 412 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 413 // be defined outside all of the current blocks (in which case the blocks do 414 // all get the bit). Walk the nesting chain. 415 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 416 NextBlock = NextBlock->PrevBlockInfo) { 417 // If we found the defining block for the variable, don't mark the block as 418 // having a reference outside it. 419 if (NextBlock->TheDecl == VD->getDeclContext()) 420 break; 421 422 // Otherwise, the DeclRef from the inner block causes the outer one to need 423 // a snapshot as well. 424 NextBlock->hasBlockDeclRefExprs = true; 425 } 426 427 return true; 428} 429 430 431 432/// ActOnIdentifierExpr - The parser read an identifier in expression context, 433/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 434/// identifier is used in a function call context. 435/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 436/// class or namespace that the identifier must be a member of. 437Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 438 IdentifierInfo &II, 439 bool HasTrailingLParen, 440 const CXXScopeSpec *SS, 441 bool isAddressOfOperand) { 442 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 443 isAddressOfOperand); 444} 445 446/// BuildDeclRefExpr - Build either a DeclRefExpr or a 447/// QualifiedDeclRefExpr based on whether or not SS is a 448/// nested-name-specifier. 449Sema::OwningExprResult 450Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 451 bool TypeDependent, bool ValueDependent, 452 const CXXScopeSpec *SS) { 453 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 454 Diag(Loc, 455 diag::err_auto_variable_cannot_appear_in_own_initializer) 456 << D->getDeclName(); 457 return ExprError(); 458 } 459 460 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 461 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 462 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 463 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 464 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 465 << D->getIdentifier() << FD->getDeclName(); 466 Diag(D->getLocation(), diag::note_local_variable_declared_here) 467 << D->getIdentifier(); 468 return ExprError(); 469 } 470 } 471 } 472 } 473 474 MarkDeclarationReferenced(Loc, D); 475 476 Expr *E; 477 if (SS && !SS->isEmpty()) { 478 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 479 ValueDependent, SS->getRange(), 480 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 481 } else 482 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 483 484 return Owned(E); 485} 486 487/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 488/// variable corresponding to the anonymous union or struct whose type 489/// is Record. 490static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 491 RecordDecl *Record) { 492 assert(Record->isAnonymousStructOrUnion() && 493 "Record must be an anonymous struct or union!"); 494 495 // FIXME: Once Decls are directly linked together, this will be an O(1) 496 // operation rather than a slow walk through DeclContext's vector (which 497 // itself will be eliminated). DeclGroups might make this even better. 498 DeclContext *Ctx = Record->getDeclContext(); 499 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 500 DEnd = Ctx->decls_end(); 501 D != DEnd; ++D) { 502 if (*D == Record) { 503 // The object for the anonymous struct/union directly 504 // follows its type in the list of declarations. 505 ++D; 506 assert(D != DEnd && "Missing object for anonymous record"); 507 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 508 return *D; 509 } 510 } 511 512 assert(false && "Missing object for anonymous record"); 513 return 0; 514} 515 516/// \brief Given a field that represents a member of an anonymous 517/// struct/union, build the path from that field's context to the 518/// actual member. 519/// 520/// Construct the sequence of field member references we'll have to 521/// perform to get to the field in the anonymous union/struct. The 522/// list of members is built from the field outward, so traverse it 523/// backwards to go from an object in the current context to the field 524/// we found. 525/// 526/// \returns The variable from which the field access should begin, 527/// for an anonymous struct/union that is not a member of another 528/// class. Otherwise, returns NULL. 529VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 530 llvm::SmallVectorImpl<FieldDecl *> &Path) { 531 assert(Field->getDeclContext()->isRecord() && 532 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 533 && "Field must be stored inside an anonymous struct or union"); 534 535 Path.push_back(Field); 536 VarDecl *BaseObject = 0; 537 DeclContext *Ctx = Field->getDeclContext(); 538 do { 539 RecordDecl *Record = cast<RecordDecl>(Ctx); 540 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 541 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 542 Path.push_back(AnonField); 543 else { 544 BaseObject = cast<VarDecl>(AnonObject); 545 break; 546 } 547 Ctx = Ctx->getParent(); 548 } while (Ctx->isRecord() && 549 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 550 551 return BaseObject; 552} 553 554Sema::OwningExprResult 555Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 556 FieldDecl *Field, 557 Expr *BaseObjectExpr, 558 SourceLocation OpLoc) { 559 llvm::SmallVector<FieldDecl *, 4> AnonFields; 560 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 561 AnonFields); 562 563 // Build the expression that refers to the base object, from 564 // which we will build a sequence of member references to each 565 // of the anonymous union objects and, eventually, the field we 566 // found via name lookup. 567 bool BaseObjectIsPointer = false; 568 unsigned ExtraQuals = 0; 569 if (BaseObject) { 570 // BaseObject is an anonymous struct/union variable (and is, 571 // therefore, not part of another non-anonymous record). 572 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 573 MarkDeclarationReferenced(Loc, BaseObject); 574 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 575 SourceLocation()); 576 ExtraQuals 577 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 578 } else if (BaseObjectExpr) { 579 // The caller provided the base object expression. Determine 580 // whether its a pointer and whether it adds any qualifiers to the 581 // anonymous struct/union fields we're looking into. 582 QualType ObjectType = BaseObjectExpr->getType(); 583 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) { 584 BaseObjectIsPointer = true; 585 ObjectType = ObjectPtr->getPointeeType(); 586 } 587 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 588 } else { 589 // We've found a member of an anonymous struct/union that is 590 // inside a non-anonymous struct/union, so in a well-formed 591 // program our base object expression is "this". 592 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 593 if (!MD->isStatic()) { 594 QualType AnonFieldType 595 = Context.getTagDeclType( 596 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 597 QualType ThisType = Context.getTagDeclType(MD->getParent()); 598 if ((Context.getCanonicalType(AnonFieldType) 599 == Context.getCanonicalType(ThisType)) || 600 IsDerivedFrom(ThisType, AnonFieldType)) { 601 // Our base object expression is "this". 602 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 603 MD->getThisType(Context)); 604 BaseObjectIsPointer = true; 605 } 606 } else { 607 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 608 << Field->getDeclName()); 609 } 610 ExtraQuals = MD->getTypeQualifiers(); 611 } 612 613 if (!BaseObjectExpr) 614 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 615 << Field->getDeclName()); 616 } 617 618 // Build the implicit member references to the field of the 619 // anonymous struct/union. 620 Expr *Result = BaseObjectExpr; 621 unsigned BaseAddrSpace = BaseObjectExpr->getType().getAddressSpace(); 622 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 623 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 624 FI != FIEnd; ++FI) { 625 QualType MemberType = (*FI)->getType(); 626 if (!(*FI)->isMutable()) { 627 unsigned combinedQualifiers 628 = MemberType.getCVRQualifiers() | ExtraQuals; 629 MemberType = MemberType.getQualifiedType(combinedQualifiers); 630 } 631 if (BaseAddrSpace != MemberType.getAddressSpace()) 632 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 633 MarkDeclarationReferenced(Loc, *FI); 634 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 635 OpLoc, MemberType); 636 BaseObjectIsPointer = false; 637 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 638 } 639 640 return Owned(Result); 641} 642 643/// ActOnDeclarationNameExpr - The parser has read some kind of name 644/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 645/// performs lookup on that name and returns an expression that refers 646/// to that name. This routine isn't directly called from the parser, 647/// because the parser doesn't know about DeclarationName. Rather, 648/// this routine is called by ActOnIdentifierExpr, 649/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 650/// which form the DeclarationName from the corresponding syntactic 651/// forms. 652/// 653/// HasTrailingLParen indicates whether this identifier is used in a 654/// function call context. LookupCtx is only used for a C++ 655/// qualified-id (foo::bar) to indicate the class or namespace that 656/// the identifier must be a member of. 657/// 658/// isAddressOfOperand means that this expression is the direct operand 659/// of an address-of operator. This matters because this is the only 660/// situation where a qualified name referencing a non-static member may 661/// appear outside a member function of this class. 662Sema::OwningExprResult 663Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 664 DeclarationName Name, bool HasTrailingLParen, 665 const CXXScopeSpec *SS, 666 bool isAddressOfOperand) { 667 // Could be enum-constant, value decl, instance variable, etc. 668 if (SS && SS->isInvalid()) 669 return ExprError(); 670 671 // C++ [temp.dep.expr]p3: 672 // An id-expression is type-dependent if it contains: 673 // -- a nested-name-specifier that contains a class-name that 674 // names a dependent type. 675 // FIXME: Member of the current instantiation. 676 if (SS && isDependentScopeSpecifier(*SS)) { 677 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 678 Loc, SS->getRange(), 679 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 680 isAddressOfOperand)); 681 } 682 683 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 684 false, true, Loc); 685 686 if (Lookup.isAmbiguous()) { 687 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 688 SS && SS->isSet() ? SS->getRange() 689 : SourceRange()); 690 return ExprError(); 691 } 692 693 NamedDecl *D = Lookup.getAsDecl(); 694 695 // If this reference is in an Objective-C method, then ivar lookup happens as 696 // well. 697 IdentifierInfo *II = Name.getAsIdentifierInfo(); 698 if (II && getCurMethodDecl()) { 699 // There are two cases to handle here. 1) scoped lookup could have failed, 700 // in which case we should look for an ivar. 2) scoped lookup could have 701 // found a decl, but that decl is outside the current instance method (i.e. 702 // a global variable). In these two cases, we do a lookup for an ivar with 703 // this name, if the lookup sucedes, we replace it our current decl. 704 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 705 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 706 ObjCInterfaceDecl *ClassDeclared; 707 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 708 // Check if referencing a field with __attribute__((deprecated)). 709 if (DiagnoseUseOfDecl(IV, Loc)) 710 return ExprError(); 711 712 // If we're referencing an invalid decl, just return this as a silent 713 // error node. The error diagnostic was already emitted on the decl. 714 if (IV->isInvalidDecl()) 715 return ExprError(); 716 717 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 718 // If a class method attemps to use a free standing ivar, this is 719 // an error. 720 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 721 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 722 << IV->getDeclName()); 723 // If a class method uses a global variable, even if an ivar with 724 // same name exists, use the global. 725 if (!IsClsMethod) { 726 if (IV->getAccessControl() == ObjCIvarDecl::Private && 727 ClassDeclared != IFace) 728 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 729 // FIXME: This should use a new expr for a direct reference, don't 730 // turn this into Self->ivar, just return a BareIVarExpr or something. 731 IdentifierInfo &II = Context.Idents.get("self"); 732 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 733 II, false); 734 MarkDeclarationReferenced(Loc, IV); 735 return Owned(new (Context) 736 ObjCIvarRefExpr(IV, IV->getType(), Loc, 737 SelfExpr.takeAs<Expr>(), true, true)); 738 } 739 } 740 } else if (getCurMethodDecl()->isInstanceMethod()) { 741 // We should warn if a local variable hides an ivar. 742 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 743 ObjCInterfaceDecl *ClassDeclared; 744 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 745 if (IV->getAccessControl() != ObjCIvarDecl::Private || 746 IFace == ClassDeclared) 747 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 748 } 749 } 750 // Needed to implement property "super.method" notation. 751 if (D == 0 && II->isStr("super")) { 752 QualType T; 753 754 if (getCurMethodDecl()->isInstanceMethod()) 755 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 756 getCurMethodDecl()->getClassInterface())); 757 else 758 T = Context.getObjCClassType(); 759 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 760 } 761 } 762 763 // Determine whether this name might be a candidate for 764 // argument-dependent lookup. 765 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 766 HasTrailingLParen; 767 768 if (ADL && D == 0) { 769 // We've seen something of the form 770 // 771 // identifier( 772 // 773 // and we did not find any entity by the name 774 // "identifier". However, this identifier is still subject to 775 // argument-dependent lookup, so keep track of the name. 776 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 777 Context.OverloadTy, 778 Loc)); 779 } 780 781 if (D == 0) { 782 // Otherwise, this could be an implicitly declared function reference (legal 783 // in C90, extension in C99). 784 if (HasTrailingLParen && II && 785 !getLangOptions().CPlusPlus) // Not in C++. 786 D = ImplicitlyDefineFunction(Loc, *II, S); 787 else { 788 // If this name wasn't predeclared and if this is not a function call, 789 // diagnose the problem. 790 if (SS && !SS->isEmpty()) 791 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 792 << Name << SS->getRange()); 793 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 794 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 795 return ExprError(Diag(Loc, diag::err_undeclared_use) 796 << Name.getAsString()); 797 else 798 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 799 } 800 } 801 802 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 803 // Warn about constructs like: 804 // if (void *X = foo()) { ... } else { X }. 805 // In the else block, the pointer is always false. 806 807 // FIXME: In a template instantiation, we don't have scope 808 // information to check this property. 809 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 810 Scope *CheckS = S; 811 while (CheckS) { 812 if (CheckS->isWithinElse() && 813 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 814 if (Var->getType()->isBooleanType()) 815 ExprError(Diag(Loc, diag::warn_value_always_false) 816 << Var->getDeclName()); 817 else 818 ExprError(Diag(Loc, diag::warn_value_always_zero) 819 << Var->getDeclName()); 820 break; 821 } 822 823 // Move up one more control parent to check again. 824 CheckS = CheckS->getControlParent(); 825 if (CheckS) 826 CheckS = CheckS->getParent(); 827 } 828 } 829 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 830 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 831 // C99 DR 316 says that, if a function type comes from a 832 // function definition (without a prototype), that type is only 833 // used for checking compatibility. Therefore, when referencing 834 // the function, we pretend that we don't have the full function 835 // type. 836 if (DiagnoseUseOfDecl(Func, Loc)) 837 return ExprError(); 838 839 QualType T = Func->getType(); 840 QualType NoProtoType = T; 841 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 842 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 843 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 844 } 845 } 846 847 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 848} 849/// \brief Cast member's object to its own class if necessary. 850bool 851Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 852 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 853 if (CXXRecordDecl *RD = 854 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 855 QualType DestType = 856 Context.getCanonicalType(Context.getTypeDeclType(RD)); 857 if (DestType->isDependentType() || From->getType()->isDependentType()) 858 return false; 859 QualType FromRecordType = From->getType(); 860 QualType DestRecordType = DestType; 861 if (FromRecordType->getAs<PointerType>()) { 862 DestType = Context.getPointerType(DestType); 863 FromRecordType = FromRecordType->getPointeeType(); 864 } 865 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 866 CheckDerivedToBaseConversion(FromRecordType, 867 DestRecordType, 868 From->getSourceRange().getBegin(), 869 From->getSourceRange())) 870 return true; 871 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 872 /*isLvalue=*/true); 873 } 874 return false; 875} 876 877/// \brief Complete semantic analysis for a reference to the given declaration. 878Sema::OwningExprResult 879Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 880 bool HasTrailingLParen, 881 const CXXScopeSpec *SS, 882 bool isAddressOfOperand) { 883 assert(D && "Cannot refer to a NULL declaration"); 884 DeclarationName Name = D->getDeclName(); 885 886 // If this is an expression of the form &Class::member, don't build an 887 // implicit member ref, because we want a pointer to the member in general, 888 // not any specific instance's member. 889 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 890 DeclContext *DC = computeDeclContext(*SS); 891 if (D && isa<CXXRecordDecl>(DC)) { 892 QualType DType; 893 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 894 DType = FD->getType().getNonReferenceType(); 895 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 896 DType = Method->getType(); 897 } else if (isa<OverloadedFunctionDecl>(D)) { 898 DType = Context.OverloadTy; 899 } 900 // Could be an inner type. That's diagnosed below, so ignore it here. 901 if (!DType.isNull()) { 902 // The pointer is type- and value-dependent if it points into something 903 // dependent. 904 bool Dependent = DC->isDependentContext(); 905 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 906 } 907 } 908 } 909 910 // We may have found a field within an anonymous union or struct 911 // (C++ [class.union]). 912 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 913 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 914 return BuildAnonymousStructUnionMemberReference(Loc, FD); 915 916 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 917 if (!MD->isStatic()) { 918 // C++ [class.mfct.nonstatic]p2: 919 // [...] if name lookup (3.4.1) resolves the name in the 920 // id-expression to a nonstatic nontype member of class X or of 921 // a base class of X, the id-expression is transformed into a 922 // class member access expression (5.2.5) using (*this) (9.3.2) 923 // as the postfix-expression to the left of the '.' operator. 924 DeclContext *Ctx = 0; 925 QualType MemberType; 926 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 927 Ctx = FD->getDeclContext(); 928 MemberType = FD->getType(); 929 930 if (const ReferenceType *RefType = MemberType->getAs<ReferenceType>()) 931 MemberType = RefType->getPointeeType(); 932 else if (!FD->isMutable()) { 933 unsigned combinedQualifiers 934 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 935 MemberType = MemberType.getQualifiedType(combinedQualifiers); 936 } 937 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 938 if (!Method->isStatic()) { 939 Ctx = Method->getParent(); 940 MemberType = Method->getType(); 941 } 942 } else if (FunctionTemplateDecl *FunTmpl 943 = dyn_cast<FunctionTemplateDecl>(D)) { 944 if (CXXMethodDecl *Method 945 = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())) { 946 if (!Method->isStatic()) { 947 Ctx = Method->getParent(); 948 MemberType = Context.OverloadTy; 949 } 950 } 951 } else if (OverloadedFunctionDecl *Ovl 952 = dyn_cast<OverloadedFunctionDecl>(D)) { 953 // FIXME: We need an abstraction for iterating over one or more function 954 // templates or functions. This code is far too repetitive! 955 for (OverloadedFunctionDecl::function_iterator 956 Func = Ovl->function_begin(), 957 FuncEnd = Ovl->function_end(); 958 Func != FuncEnd; ++Func) { 959 CXXMethodDecl *DMethod = 0; 960 if (FunctionTemplateDecl *FunTmpl 961 = dyn_cast<FunctionTemplateDecl>(*Func)) 962 DMethod = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 963 else 964 DMethod = dyn_cast<CXXMethodDecl>(*Func); 965 966 if (DMethod && !DMethod->isStatic()) { 967 Ctx = DMethod->getDeclContext(); 968 MemberType = Context.OverloadTy; 969 break; 970 } 971 } 972 } 973 974 if (Ctx && Ctx->isRecord()) { 975 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 976 QualType ThisType = Context.getTagDeclType(MD->getParent()); 977 if ((Context.getCanonicalType(CtxType) 978 == Context.getCanonicalType(ThisType)) || 979 IsDerivedFrom(ThisType, CtxType)) { 980 // Build the implicit member access expression. 981 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 982 MD->getThisType(Context)); 983 MarkDeclarationReferenced(Loc, D); 984 if (PerformObjectMemberConversion(This, D)) 985 return ExprError(); 986 if (DiagnoseUseOfDecl(D, Loc)) 987 return ExprError(); 988 return Owned(new (Context) MemberExpr(This, true, D, 989 Loc, MemberType)); 990 } 991 } 992 } 993 } 994 995 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 996 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 997 if (MD->isStatic()) 998 // "invalid use of member 'x' in static member function" 999 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1000 << FD->getDeclName()); 1001 } 1002 1003 // Any other ways we could have found the field in a well-formed 1004 // program would have been turned into implicit member expressions 1005 // above. 1006 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1007 << FD->getDeclName()); 1008 } 1009 1010 if (isa<TypedefDecl>(D)) 1011 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1012 if (isa<ObjCInterfaceDecl>(D)) 1013 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1014 if (isa<NamespaceDecl>(D)) 1015 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1016 1017 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1018 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1019 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1020 false, false, SS); 1021 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1022 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1023 false, false, SS); 1024 ValueDecl *VD = cast<ValueDecl>(D); 1025 1026 // Check whether this declaration can be used. Note that we suppress 1027 // this check when we're going to perform argument-dependent lookup 1028 // on this function name, because this might not be the function 1029 // that overload resolution actually selects. 1030 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1031 HasTrailingLParen; 1032 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1033 return ExprError(); 1034 1035 // Only create DeclRefExpr's for valid Decl's. 1036 if (VD->isInvalidDecl()) 1037 return ExprError(); 1038 1039 // If the identifier reference is inside a block, and it refers to a value 1040 // that is outside the block, create a BlockDeclRefExpr instead of a 1041 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1042 // the block is formed. 1043 // 1044 // We do not do this for things like enum constants, global variables, etc, 1045 // as they do not get snapshotted. 1046 // 1047 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1048 MarkDeclarationReferenced(Loc, VD); 1049 QualType ExprTy = VD->getType().getNonReferenceType(); 1050 // The BlocksAttr indicates the variable is bound by-reference. 1051 if (VD->getAttr<BlocksAttr>()) 1052 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1053 // This is to record that a 'const' was actually synthesize and added. 1054 bool constAdded = !ExprTy.isConstQualified(); 1055 // Variable will be bound by-copy, make it const within the closure. 1056 1057 ExprTy.addConst(); 1058 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1059 constAdded)); 1060 } 1061 // If this reference is not in a block or if the referenced variable is 1062 // within the block, create a normal DeclRefExpr. 1063 1064 bool TypeDependent = false; 1065 bool ValueDependent = false; 1066 if (getLangOptions().CPlusPlus) { 1067 // C++ [temp.dep.expr]p3: 1068 // An id-expression is type-dependent if it contains: 1069 // - an identifier that was declared with a dependent type, 1070 if (VD->getType()->isDependentType()) 1071 TypeDependent = true; 1072 // - FIXME: a template-id that is dependent, 1073 // - a conversion-function-id that specifies a dependent type, 1074 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1075 Name.getCXXNameType()->isDependentType()) 1076 TypeDependent = true; 1077 // - a nested-name-specifier that contains a class-name that 1078 // names a dependent type. 1079 else if (SS && !SS->isEmpty()) { 1080 for (DeclContext *DC = computeDeclContext(*SS); 1081 DC; DC = DC->getParent()) { 1082 // FIXME: could stop early at namespace scope. 1083 if (DC->isRecord()) { 1084 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1085 if (Context.getTypeDeclType(Record)->isDependentType()) { 1086 TypeDependent = true; 1087 break; 1088 } 1089 } 1090 } 1091 } 1092 1093 // C++ [temp.dep.constexpr]p2: 1094 // 1095 // An identifier is value-dependent if it is: 1096 // - a name declared with a dependent type, 1097 if (TypeDependent) 1098 ValueDependent = true; 1099 // - the name of a non-type template parameter, 1100 else if (isa<NonTypeTemplateParmDecl>(VD)) 1101 ValueDependent = true; 1102 // - a constant with integral or enumeration type and is 1103 // initialized with an expression that is value-dependent 1104 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1105 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1106 Dcl->getInit()) { 1107 ValueDependent = Dcl->getInit()->isValueDependent(); 1108 } 1109 } 1110 } 1111 1112 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1113 TypeDependent, ValueDependent, SS); 1114} 1115 1116Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1117 tok::TokenKind Kind) { 1118 PredefinedExpr::IdentType IT; 1119 1120 switch (Kind) { 1121 default: assert(0 && "Unknown simple primary expr!"); 1122 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1123 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1124 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1125 } 1126 1127 // Pre-defined identifiers are of type char[x], where x is the length of the 1128 // string. 1129 unsigned Length; 1130 if (FunctionDecl *FD = getCurFunctionDecl()) 1131 Length = FD->getIdentifier()->getLength(); 1132 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1133 Length = MD->getSynthesizedMethodSize(); 1134 else { 1135 Diag(Loc, diag::ext_predef_outside_function); 1136 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1137 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1138 } 1139 1140 1141 llvm::APInt LengthI(32, Length + 1); 1142 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1143 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1144 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1145} 1146 1147Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1148 llvm::SmallString<16> CharBuffer; 1149 CharBuffer.resize(Tok.getLength()); 1150 const char *ThisTokBegin = &CharBuffer[0]; 1151 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1152 1153 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1154 Tok.getLocation(), PP); 1155 if (Literal.hadError()) 1156 return ExprError(); 1157 1158 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1159 1160 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1161 Literal.isWide(), 1162 type, Tok.getLocation())); 1163} 1164 1165Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1166 // Fast path for a single digit (which is quite common). A single digit 1167 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1168 if (Tok.getLength() == 1) { 1169 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1170 unsigned IntSize = Context.Target.getIntWidth(); 1171 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1172 Context.IntTy, Tok.getLocation())); 1173 } 1174 1175 llvm::SmallString<512> IntegerBuffer; 1176 // Add padding so that NumericLiteralParser can overread by one character. 1177 IntegerBuffer.resize(Tok.getLength()+1); 1178 const char *ThisTokBegin = &IntegerBuffer[0]; 1179 1180 // Get the spelling of the token, which eliminates trigraphs, etc. 1181 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1182 1183 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1184 Tok.getLocation(), PP); 1185 if (Literal.hadError) 1186 return ExprError(); 1187 1188 Expr *Res; 1189 1190 if (Literal.isFloatingLiteral()) { 1191 QualType Ty; 1192 if (Literal.isFloat) 1193 Ty = Context.FloatTy; 1194 else if (!Literal.isLong) 1195 Ty = Context.DoubleTy; 1196 else 1197 Ty = Context.LongDoubleTy; 1198 1199 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1200 1201 // isExact will be set by GetFloatValue(). 1202 bool isExact = false; 1203 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1204 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1205 1206 } else if (!Literal.isIntegerLiteral()) { 1207 return ExprError(); 1208 } else { 1209 QualType Ty; 1210 1211 // long long is a C99 feature. 1212 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1213 Literal.isLongLong) 1214 Diag(Tok.getLocation(), diag::ext_longlong); 1215 1216 // Get the value in the widest-possible width. 1217 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1218 1219 if (Literal.GetIntegerValue(ResultVal)) { 1220 // If this value didn't fit into uintmax_t, warn and force to ull. 1221 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1222 Ty = Context.UnsignedLongLongTy; 1223 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1224 "long long is not intmax_t?"); 1225 } else { 1226 // If this value fits into a ULL, try to figure out what else it fits into 1227 // according to the rules of C99 6.4.4.1p5. 1228 1229 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1230 // be an unsigned int. 1231 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1232 1233 // Check from smallest to largest, picking the smallest type we can. 1234 unsigned Width = 0; 1235 if (!Literal.isLong && !Literal.isLongLong) { 1236 // Are int/unsigned possibilities? 1237 unsigned IntSize = Context.Target.getIntWidth(); 1238 1239 // Does it fit in a unsigned int? 1240 if (ResultVal.isIntN(IntSize)) { 1241 // Does it fit in a signed int? 1242 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1243 Ty = Context.IntTy; 1244 else if (AllowUnsigned) 1245 Ty = Context.UnsignedIntTy; 1246 Width = IntSize; 1247 } 1248 } 1249 1250 // Are long/unsigned long possibilities? 1251 if (Ty.isNull() && !Literal.isLongLong) { 1252 unsigned LongSize = Context.Target.getLongWidth(); 1253 1254 // Does it fit in a unsigned long? 1255 if (ResultVal.isIntN(LongSize)) { 1256 // Does it fit in a signed long? 1257 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1258 Ty = Context.LongTy; 1259 else if (AllowUnsigned) 1260 Ty = Context.UnsignedLongTy; 1261 Width = LongSize; 1262 } 1263 } 1264 1265 // Finally, check long long if needed. 1266 if (Ty.isNull()) { 1267 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1268 1269 // Does it fit in a unsigned long long? 1270 if (ResultVal.isIntN(LongLongSize)) { 1271 // Does it fit in a signed long long? 1272 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1273 Ty = Context.LongLongTy; 1274 else if (AllowUnsigned) 1275 Ty = Context.UnsignedLongLongTy; 1276 Width = LongLongSize; 1277 } 1278 } 1279 1280 // If we still couldn't decide a type, we probably have something that 1281 // does not fit in a signed long long, but has no U suffix. 1282 if (Ty.isNull()) { 1283 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1284 Ty = Context.UnsignedLongLongTy; 1285 Width = Context.Target.getLongLongWidth(); 1286 } 1287 1288 if (ResultVal.getBitWidth() != Width) 1289 ResultVal.trunc(Width); 1290 } 1291 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1292 } 1293 1294 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1295 if (Literal.isImaginary) 1296 Res = new (Context) ImaginaryLiteral(Res, 1297 Context.getComplexType(Res->getType())); 1298 1299 return Owned(Res); 1300} 1301 1302Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1303 SourceLocation R, ExprArg Val) { 1304 Expr *E = Val.takeAs<Expr>(); 1305 assert((E != 0) && "ActOnParenExpr() missing expr"); 1306 return Owned(new (Context) ParenExpr(L, R, E)); 1307} 1308 1309/// The UsualUnaryConversions() function is *not* called by this routine. 1310/// See C99 6.3.2.1p[2-4] for more details. 1311bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1312 SourceLocation OpLoc, 1313 const SourceRange &ExprRange, 1314 bool isSizeof) { 1315 if (exprType->isDependentType()) 1316 return false; 1317 1318 // C99 6.5.3.4p1: 1319 if (isa<FunctionType>(exprType)) { 1320 // alignof(function) is allowed as an extension. 1321 if (isSizeof) 1322 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1323 return false; 1324 } 1325 1326 // Allow sizeof(void)/alignof(void) as an extension. 1327 if (exprType->isVoidType()) { 1328 Diag(OpLoc, diag::ext_sizeof_void_type) 1329 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1330 return false; 1331 } 1332 1333 if (RequireCompleteType(OpLoc, exprType, 1334 isSizeof ? diag::err_sizeof_incomplete_type : 1335 diag::err_alignof_incomplete_type, 1336 ExprRange)) 1337 return true; 1338 1339 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1340 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1341 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1342 << exprType << isSizeof << ExprRange; 1343 return true; 1344 } 1345 1346 return false; 1347} 1348 1349bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1350 const SourceRange &ExprRange) { 1351 E = E->IgnoreParens(); 1352 1353 // alignof decl is always ok. 1354 if (isa<DeclRefExpr>(E)) 1355 return false; 1356 1357 // Cannot know anything else if the expression is dependent. 1358 if (E->isTypeDependent()) 1359 return false; 1360 1361 if (E->getBitField()) { 1362 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1363 return true; 1364 } 1365 1366 // Alignment of a field access is always okay, so long as it isn't a 1367 // bit-field. 1368 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1369 if (isa<FieldDecl>(ME->getMemberDecl())) 1370 return false; 1371 1372 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1373} 1374 1375/// \brief Build a sizeof or alignof expression given a type operand. 1376Action::OwningExprResult 1377Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1378 bool isSizeOf, SourceRange R) { 1379 if (T.isNull()) 1380 return ExprError(); 1381 1382 if (!T->isDependentType() && 1383 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1384 return ExprError(); 1385 1386 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1387 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1388 Context.getSizeType(), OpLoc, 1389 R.getEnd())); 1390} 1391 1392/// \brief Build a sizeof or alignof expression given an expression 1393/// operand. 1394Action::OwningExprResult 1395Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1396 bool isSizeOf, SourceRange R) { 1397 // Verify that the operand is valid. 1398 bool isInvalid = false; 1399 if (E->isTypeDependent()) { 1400 // Delay type-checking for type-dependent expressions. 1401 } else if (!isSizeOf) { 1402 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1403 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1404 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1405 isInvalid = true; 1406 } else { 1407 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1408 } 1409 1410 if (isInvalid) 1411 return ExprError(); 1412 1413 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1414 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1415 Context.getSizeType(), OpLoc, 1416 R.getEnd())); 1417} 1418 1419/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1420/// the same for @c alignof and @c __alignof 1421/// Note that the ArgRange is invalid if isType is false. 1422Action::OwningExprResult 1423Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1424 void *TyOrEx, const SourceRange &ArgRange) { 1425 // If error parsing type, ignore. 1426 if (TyOrEx == 0) return ExprError(); 1427 1428 if (isType) { 1429 // FIXME: Preserve type source info. 1430 QualType ArgTy = GetTypeFromParser(TyOrEx); 1431 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1432 } 1433 1434 // Get the end location. 1435 Expr *ArgEx = (Expr *)TyOrEx; 1436 Action::OwningExprResult Result 1437 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1438 1439 if (Result.isInvalid()) 1440 DeleteExpr(ArgEx); 1441 1442 return move(Result); 1443} 1444 1445QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1446 if (V->isTypeDependent()) 1447 return Context.DependentTy; 1448 1449 // These operators return the element type of a complex type. 1450 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1451 return CT->getElementType(); 1452 1453 // Otherwise they pass through real integer and floating point types here. 1454 if (V->getType()->isArithmeticType()) 1455 return V->getType(); 1456 1457 // Reject anything else. 1458 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1459 << (isReal ? "__real" : "__imag"); 1460 return QualType(); 1461} 1462 1463 1464 1465Action::OwningExprResult 1466Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1467 tok::TokenKind Kind, ExprArg Input) { 1468 // Since this might be a postfix expression, get rid of ParenListExprs. 1469 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1470 Expr *Arg = (Expr *)Input.get(); 1471 1472 UnaryOperator::Opcode Opc; 1473 switch (Kind) { 1474 default: assert(0 && "Unknown unary op!"); 1475 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1476 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1477 } 1478 1479 if (getLangOptions().CPlusPlus && 1480 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1481 // Which overloaded operator? 1482 OverloadedOperatorKind OverOp = 1483 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1484 1485 // C++ [over.inc]p1: 1486 // 1487 // [...] If the function is a member function with one 1488 // parameter (which shall be of type int) or a non-member 1489 // function with two parameters (the second of which shall be 1490 // of type int), it defines the postfix increment operator ++ 1491 // for objects of that type. When the postfix increment is 1492 // called as a result of using the ++ operator, the int 1493 // argument will have value zero. 1494 Expr *Args[2] = { 1495 Arg, 1496 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1497 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1498 }; 1499 1500 // Build the candidate set for overloading 1501 OverloadCandidateSet CandidateSet; 1502 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1503 1504 // Perform overload resolution. 1505 OverloadCandidateSet::iterator Best; 1506 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1507 case OR_Success: { 1508 // We found a built-in operator or an overloaded operator. 1509 FunctionDecl *FnDecl = Best->Function; 1510 1511 if (FnDecl) { 1512 // We matched an overloaded operator. Build a call to that 1513 // operator. 1514 1515 // Convert the arguments. 1516 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1517 if (PerformObjectArgumentInitialization(Arg, Method)) 1518 return ExprError(); 1519 } else { 1520 // Convert the arguments. 1521 if (PerformCopyInitialization(Arg, 1522 FnDecl->getParamDecl(0)->getType(), 1523 "passing")) 1524 return ExprError(); 1525 } 1526 1527 // Determine the result type 1528 QualType ResultTy 1529 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1530 ResultTy = ResultTy.getNonReferenceType(); 1531 1532 // Build the actual expression node. 1533 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1534 SourceLocation()); 1535 UsualUnaryConversions(FnExpr); 1536 1537 Input.release(); 1538 Args[0] = Arg; 1539 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1540 Args, 2, ResultTy, 1541 OpLoc)); 1542 } else { 1543 // We matched a built-in operator. Convert the arguments, then 1544 // break out so that we will build the appropriate built-in 1545 // operator node. 1546 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1547 "passing")) 1548 return ExprError(); 1549 1550 break; 1551 } 1552 } 1553 1554 case OR_No_Viable_Function: 1555 // No viable function; fall through to handling this as a 1556 // built-in operator, which will produce an error message for us. 1557 break; 1558 1559 case OR_Ambiguous: 1560 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1561 << UnaryOperator::getOpcodeStr(Opc) 1562 << Arg->getSourceRange(); 1563 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1564 return ExprError(); 1565 1566 case OR_Deleted: 1567 Diag(OpLoc, diag::err_ovl_deleted_oper) 1568 << Best->Function->isDeleted() 1569 << UnaryOperator::getOpcodeStr(Opc) 1570 << Arg->getSourceRange(); 1571 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1572 return ExprError(); 1573 } 1574 1575 // Either we found no viable overloaded operator or we matched a 1576 // built-in operator. In either case, fall through to trying to 1577 // build a built-in operation. 1578 } 1579 1580 Input.release(); 1581 Input = Arg; 1582 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1583} 1584 1585Action::OwningExprResult 1586Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1587 ExprArg Idx, SourceLocation RLoc) { 1588 // Since this might be a postfix expression, get rid of ParenListExprs. 1589 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1590 1591 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1592 *RHSExp = static_cast<Expr*>(Idx.get()); 1593 1594 if (getLangOptions().CPlusPlus && 1595 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1596 Base.release(); 1597 Idx.release(); 1598 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1599 Context.DependentTy, RLoc)); 1600 } 1601 1602 if (getLangOptions().CPlusPlus && 1603 (LHSExp->getType()->isRecordType() || 1604 LHSExp->getType()->isEnumeralType() || 1605 RHSExp->getType()->isRecordType() || 1606 RHSExp->getType()->isEnumeralType())) { 1607 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1608 // to the candidate set. 1609 OverloadCandidateSet CandidateSet; 1610 Expr *Args[2] = { LHSExp, RHSExp }; 1611 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1612 SourceRange(LLoc, RLoc)); 1613 1614 // Perform overload resolution. 1615 OverloadCandidateSet::iterator Best; 1616 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1617 case OR_Success: { 1618 // We found a built-in operator or an overloaded operator. 1619 FunctionDecl *FnDecl = Best->Function; 1620 1621 if (FnDecl) { 1622 // We matched an overloaded operator. Build a call to that 1623 // operator. 1624 1625 // Convert the arguments. 1626 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1627 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1628 PerformCopyInitialization(RHSExp, 1629 FnDecl->getParamDecl(0)->getType(), 1630 "passing")) 1631 return ExprError(); 1632 } else { 1633 // Convert the arguments. 1634 if (PerformCopyInitialization(LHSExp, 1635 FnDecl->getParamDecl(0)->getType(), 1636 "passing") || 1637 PerformCopyInitialization(RHSExp, 1638 FnDecl->getParamDecl(1)->getType(), 1639 "passing")) 1640 return ExprError(); 1641 } 1642 1643 // Determine the result type 1644 QualType ResultTy 1645 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1646 ResultTy = ResultTy.getNonReferenceType(); 1647 1648 // Build the actual expression node. 1649 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1650 SourceLocation()); 1651 UsualUnaryConversions(FnExpr); 1652 1653 Base.release(); 1654 Idx.release(); 1655 Args[0] = LHSExp; 1656 Args[1] = RHSExp; 1657 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1658 FnExpr, Args, 2, 1659 ResultTy, LLoc)); 1660 } else { 1661 // We matched a built-in operator. Convert the arguments, then 1662 // break out so that we will build the appropriate built-in 1663 // operator node. 1664 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1665 "passing") || 1666 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1667 "passing")) 1668 return ExprError(); 1669 1670 break; 1671 } 1672 } 1673 1674 case OR_No_Viable_Function: 1675 // No viable function; fall through to handling this as a 1676 // built-in operator, which will produce an error message for us. 1677 break; 1678 1679 case OR_Ambiguous: 1680 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1681 << "[]" 1682 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1683 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1684 return ExprError(); 1685 1686 case OR_Deleted: 1687 Diag(LLoc, diag::err_ovl_deleted_oper) 1688 << Best->Function->isDeleted() 1689 << "[]" 1690 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1691 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1692 return ExprError(); 1693 } 1694 1695 // Either we found no viable overloaded operator or we matched a 1696 // built-in operator. In either case, fall through to trying to 1697 // build a built-in operation. 1698 } 1699 1700 // Perform default conversions. 1701 DefaultFunctionArrayConversion(LHSExp); 1702 DefaultFunctionArrayConversion(RHSExp); 1703 1704 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1705 1706 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1707 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1708 // in the subscript position. As a result, we need to derive the array base 1709 // and index from the expression types. 1710 Expr *BaseExpr, *IndexExpr; 1711 QualType ResultType; 1712 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1713 BaseExpr = LHSExp; 1714 IndexExpr = RHSExp; 1715 ResultType = Context.DependentTy; 1716 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1717 BaseExpr = LHSExp; 1718 IndexExpr = RHSExp; 1719 ResultType = PTy->getPointeeType(); 1720 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1721 // Handle the uncommon case of "123[Ptr]". 1722 BaseExpr = RHSExp; 1723 IndexExpr = LHSExp; 1724 ResultType = PTy->getPointeeType(); 1725 } else if (const ObjCObjectPointerType *PTy = 1726 LHSTy->getAsObjCObjectPointerType()) { 1727 BaseExpr = LHSExp; 1728 IndexExpr = RHSExp; 1729 ResultType = PTy->getPointeeType(); 1730 } else if (const ObjCObjectPointerType *PTy = 1731 RHSTy->getAsObjCObjectPointerType()) { 1732 // Handle the uncommon case of "123[Ptr]". 1733 BaseExpr = RHSExp; 1734 IndexExpr = LHSExp; 1735 ResultType = PTy->getPointeeType(); 1736 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1737 BaseExpr = LHSExp; // vectors: V[123] 1738 IndexExpr = RHSExp; 1739 1740 // FIXME: need to deal with const... 1741 ResultType = VTy->getElementType(); 1742 } else if (LHSTy->isArrayType()) { 1743 // If we see an array that wasn't promoted by 1744 // DefaultFunctionArrayConversion, it must be an array that 1745 // wasn't promoted because of the C90 rule that doesn't 1746 // allow promoting non-lvalue arrays. Warn, then 1747 // force the promotion here. 1748 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1749 LHSExp->getSourceRange(); 1750 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1751 LHSTy = LHSExp->getType(); 1752 1753 BaseExpr = LHSExp; 1754 IndexExpr = RHSExp; 1755 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1756 } else if (RHSTy->isArrayType()) { 1757 // Same as previous, except for 123[f().a] case 1758 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1759 RHSExp->getSourceRange(); 1760 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1761 RHSTy = RHSExp->getType(); 1762 1763 BaseExpr = RHSExp; 1764 IndexExpr = LHSExp; 1765 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1766 } else { 1767 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1768 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1769 } 1770 // C99 6.5.2.1p1 1771 if (!(IndexExpr->getType()->isIntegerType() && 1772 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1773 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1774 << IndexExpr->getSourceRange()); 1775 1776 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1777 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1778 // type. Note that Functions are not objects, and that (in C99 parlance) 1779 // incomplete types are not object types. 1780 if (ResultType->isFunctionType()) { 1781 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1782 << ResultType << BaseExpr->getSourceRange(); 1783 return ExprError(); 1784 } 1785 1786 if (!ResultType->isDependentType() && 1787 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1788 BaseExpr->getSourceRange())) 1789 return ExprError(); 1790 1791 // Diagnose bad cases where we step over interface counts. 1792 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1793 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1794 << ResultType << BaseExpr->getSourceRange(); 1795 return ExprError(); 1796 } 1797 1798 Base.release(); 1799 Idx.release(); 1800 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1801 ResultType, RLoc)); 1802} 1803 1804QualType Sema:: 1805CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1806 const IdentifierInfo *CompName, 1807 SourceLocation CompLoc) { 1808 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1809 1810 // The vector accessor can't exceed the number of elements. 1811 const char *compStr = CompName->getName(); 1812 1813 // This flag determines whether or not the component is one of the four 1814 // special names that indicate a subset of exactly half the elements are 1815 // to be selected. 1816 bool HalvingSwizzle = false; 1817 1818 // This flag determines whether or not CompName has an 's' char prefix, 1819 // indicating that it is a string of hex values to be used as vector indices. 1820 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1821 1822 // Check that we've found one of the special components, or that the component 1823 // names must come from the same set. 1824 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1825 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1826 HalvingSwizzle = true; 1827 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1828 do 1829 compStr++; 1830 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1831 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1832 do 1833 compStr++; 1834 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1835 } 1836 1837 if (!HalvingSwizzle && *compStr) { 1838 // We didn't get to the end of the string. This means the component names 1839 // didn't come from the same set *or* we encountered an illegal name. 1840 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1841 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1842 return QualType(); 1843 } 1844 1845 // Ensure no component accessor exceeds the width of the vector type it 1846 // operates on. 1847 if (!HalvingSwizzle) { 1848 compStr = CompName->getName(); 1849 1850 if (HexSwizzle) 1851 compStr++; 1852 1853 while (*compStr) { 1854 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1855 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1856 << baseType << SourceRange(CompLoc); 1857 return QualType(); 1858 } 1859 } 1860 } 1861 1862 // If this is a halving swizzle, verify that the base type has an even 1863 // number of elements. 1864 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1865 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1866 << baseType << SourceRange(CompLoc); 1867 return QualType(); 1868 } 1869 1870 // The component accessor looks fine - now we need to compute the actual type. 1871 // The vector type is implied by the component accessor. For example, 1872 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1873 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1874 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1875 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1876 : CompName->getLength(); 1877 if (HexSwizzle) 1878 CompSize--; 1879 1880 if (CompSize == 1) 1881 return vecType->getElementType(); 1882 1883 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1884 // Now look up the TypeDefDecl from the vector type. Without this, 1885 // diagostics look bad. We want extended vector types to appear built-in. 1886 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1887 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1888 return Context.getTypedefType(ExtVectorDecls[i]); 1889 } 1890 return VT; // should never get here (a typedef type should always be found). 1891} 1892 1893static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1894 IdentifierInfo *Member, 1895 const Selector &Sel, 1896 ASTContext &Context) { 1897 1898 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1899 return PD; 1900 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1901 return OMD; 1902 1903 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1904 E = PDecl->protocol_end(); I != E; ++I) { 1905 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1906 Context)) 1907 return D; 1908 } 1909 return 0; 1910} 1911 1912static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1913 IdentifierInfo *Member, 1914 const Selector &Sel, 1915 ASTContext &Context) { 1916 // Check protocols on qualified interfaces. 1917 Decl *GDecl = 0; 1918 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1919 E = QIdTy->qual_end(); I != E; ++I) { 1920 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1921 GDecl = PD; 1922 break; 1923 } 1924 // Also must look for a getter name which uses property syntax. 1925 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1926 GDecl = OMD; 1927 break; 1928 } 1929 } 1930 if (!GDecl) { 1931 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1932 E = QIdTy->qual_end(); I != E; ++I) { 1933 // Search in the protocol-qualifier list of current protocol. 1934 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1935 if (GDecl) 1936 return GDecl; 1937 } 1938 } 1939 return GDecl; 1940} 1941 1942/// FindMethodInNestedImplementations - Look up a method in current and 1943/// all base class implementations. 1944/// 1945ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1946 const ObjCInterfaceDecl *IFace, 1947 const Selector &Sel) { 1948 ObjCMethodDecl *Method = 0; 1949 if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation()) 1950 Method = ImpDecl->getInstanceMethod(Sel); 1951 1952 if (!Method && IFace->getSuperClass()) 1953 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1954 return Method; 1955} 1956 1957Action::OwningExprResult 1958Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1959 tok::TokenKind OpKind, SourceLocation MemberLoc, 1960 DeclarationName MemberName, 1961 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 1962 if (SS && SS->isInvalid()) 1963 return ExprError(); 1964 1965 // Since this might be a postfix expression, get rid of ParenListExprs. 1966 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1967 1968 Expr *BaseExpr = Base.takeAs<Expr>(); 1969 assert(BaseExpr && "no record expression"); 1970 1971 // Perform default conversions. 1972 DefaultFunctionArrayConversion(BaseExpr); 1973 1974 QualType BaseType = BaseExpr->getType(); 1975 // If this is an Objective-C pseudo-builtin and a definition is provided then 1976 // use that. 1977 if (BaseType->isObjCIdType()) { 1978 // We have an 'id' type. Rather than fall through, we check if this 1979 // is a reference to 'isa'. 1980 if (BaseType != Context.ObjCIdRedefinitionType) { 1981 BaseType = Context.ObjCIdRedefinitionType; 1982 ImpCastExprToType(BaseExpr, BaseType); 1983 } 1984 } else if (BaseType->isObjCClassType() && 1985 BaseType != Context.ObjCClassRedefinitionType) { 1986 BaseType = Context.ObjCClassRedefinitionType; 1987 ImpCastExprToType(BaseExpr, BaseType); 1988 } 1989 assert(!BaseType.isNull() && "no type for member expression"); 1990 1991 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1992 // must have pointer type, and the accessed type is the pointee. 1993 if (OpKind == tok::arrow) { 1994 if (BaseType->isDependentType()) 1995 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 1996 BaseExpr, true, 1997 OpLoc, 1998 MemberName, 1999 MemberLoc)); 2000 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2001 BaseType = PT->getPointeeType(); 2002 else if (BaseType->isObjCObjectPointerType()) 2003 ; 2004 else 2005 return ExprError(Diag(MemberLoc, 2006 diag::err_typecheck_member_reference_arrow) 2007 << BaseType << BaseExpr->getSourceRange()); 2008 } else { 2009 if (BaseType->isDependentType()) { 2010 // Require that the base type isn't a pointer type 2011 // (so we'll report an error for) 2012 // T* t; 2013 // t.f; 2014 // 2015 // In Obj-C++, however, the above expression is valid, since it could be 2016 // accessing the 'f' property if T is an Obj-C interface. The extra check 2017 // allows this, while still reporting an error if T is a struct pointer. 2018 const PointerType *PT = BaseType->getAs<PointerType>(); 2019 2020 if (!PT || (getLangOptions().ObjC1 && 2021 !PT->getPointeeType()->isRecordType())) 2022 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2023 BaseExpr, false, 2024 OpLoc, 2025 MemberName, 2026 MemberLoc)); 2027 } 2028 } 2029 2030 // Handle field access to simple records. This also handles access to fields 2031 // of the ObjC 'id' struct. 2032 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2033 RecordDecl *RDecl = RTy->getDecl(); 2034 if (RequireCompleteType(OpLoc, BaseType, 2035 diag::err_typecheck_incomplete_tag, 2036 BaseExpr->getSourceRange())) 2037 return ExprError(); 2038 2039 DeclContext *DC = RDecl; 2040 if (SS && SS->isSet()) { 2041 // If the member name was a qualified-id, look into the 2042 // nested-name-specifier. 2043 DC = computeDeclContext(*SS, false); 2044 2045 // FIXME: If DC is not computable, we should build a 2046 // CXXUnresolvedMemberExpr. 2047 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2048 } 2049 2050 // The record definition is complete, now make sure the member is valid. 2051 LookupResult Result 2052 = LookupQualifiedName(DC, MemberName, LookupMemberName, false); 2053 2054 if (SS && SS->isSet()) { 2055 QualType BaseTypeCanon 2056 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2057 QualType MemberTypeCanon 2058 = Context.getCanonicalType( 2059 Context.getTypeDeclType( 2060 dyn_cast<TypeDecl>(Result.getAsDecl()->getDeclContext()))); 2061 2062 if (BaseTypeCanon != MemberTypeCanon && 2063 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2064 return ExprError(Diag(SS->getBeginLoc(), 2065 diag::err_not_direct_base_or_virtual) 2066 << MemberTypeCanon << BaseTypeCanon); 2067 } 2068 2069 if (!Result) 2070 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2071 << MemberName << BaseExpr->getSourceRange()); 2072 if (Result.isAmbiguous()) { 2073 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2074 BaseExpr->getSourceRange()); 2075 return ExprError(); 2076 } 2077 2078 NamedDecl *MemberDecl = Result; 2079 2080 // If the decl being referenced had an error, return an error for this 2081 // sub-expr without emitting another error, in order to avoid cascading 2082 // error cases. 2083 if (MemberDecl->isInvalidDecl()) 2084 return ExprError(); 2085 2086 // Check the use of this field 2087 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2088 return ExprError(); 2089 2090 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2091 // We may have found a field within an anonymous union or struct 2092 // (C++ [class.union]). 2093 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2094 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2095 BaseExpr, OpLoc); 2096 2097 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2098 QualType MemberType = FD->getType(); 2099 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2100 MemberType = Ref->getPointeeType(); 2101 else { 2102 unsigned BaseAddrSpace = BaseType.getAddressSpace(); 2103 unsigned combinedQualifiers = 2104 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2105 if (FD->isMutable()) 2106 combinedQualifiers &= ~QualType::Const; 2107 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2108 if (BaseAddrSpace != MemberType.getAddressSpace()) 2109 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 2110 } 2111 2112 MarkDeclarationReferenced(MemberLoc, FD); 2113 if (PerformObjectMemberConversion(BaseExpr, FD)) 2114 return ExprError(); 2115 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2116 MemberLoc, MemberType)); 2117 } 2118 2119 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2120 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2121 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2122 Var, MemberLoc, 2123 Var->getType().getNonReferenceType())); 2124 } 2125 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2126 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2127 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2128 MemberFn, MemberLoc, 2129 MemberFn->getType())); 2130 } 2131 if (FunctionTemplateDecl *FunTmpl 2132 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2133 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2134 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2135 FunTmpl, MemberLoc, 2136 Context.OverloadTy)); 2137 } 2138 if (OverloadedFunctionDecl *Ovl 2139 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2140 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2141 MemberLoc, Context.OverloadTy)); 2142 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2143 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2144 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2145 Enum, MemberLoc, Enum->getType())); 2146 } 2147 if (isa<TypeDecl>(MemberDecl)) 2148 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2149 << MemberName << int(OpKind == tok::arrow)); 2150 2151 // We found a declaration kind that we didn't expect. This is a 2152 // generic error message that tells the user that she can't refer 2153 // to this member with '.' or '->'. 2154 return ExprError(Diag(MemberLoc, 2155 diag::err_typecheck_member_reference_unknown) 2156 << MemberName << int(OpKind == tok::arrow)); 2157 } 2158 2159 // Handle properties on ObjC 'Class' types. 2160 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2161 // Also must look for a getter name which uses property syntax. 2162 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2163 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2164 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2165 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2166 ObjCMethodDecl *Getter; 2167 // FIXME: need to also look locally in the implementation. 2168 if ((Getter = IFace->lookupClassMethod(Sel))) { 2169 // Check the use of this method. 2170 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2171 return ExprError(); 2172 } 2173 // If we found a getter then this may be a valid dot-reference, we 2174 // will look for the matching setter, in case it is needed. 2175 Selector SetterSel = 2176 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2177 PP.getSelectorTable(), Member); 2178 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2179 if (!Setter) { 2180 // If this reference is in an @implementation, also check for 'private' 2181 // methods. 2182 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2183 } 2184 // Look through local category implementations associated with the class. 2185 if (!Setter) 2186 Setter = IFace->getCategoryClassMethod(SetterSel); 2187 2188 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2189 return ExprError(); 2190 2191 if (Getter || Setter) { 2192 QualType PType; 2193 2194 if (Getter) 2195 PType = Getter->getResultType(); 2196 else 2197 // Get the expression type from Setter's incoming parameter. 2198 PType = (*(Setter->param_end() -1))->getType(); 2199 // FIXME: we must check that the setter has property type. 2200 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2201 Setter, MemberLoc, BaseExpr)); 2202 } 2203 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2204 << MemberName << BaseType); 2205 } 2206 } 2207 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2208 // (*Obj).ivar. 2209 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2210 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2211 const ObjCObjectPointerType *OPT = BaseType->getAsObjCObjectPointerType(); 2212 const ObjCInterfaceType *IFaceT = 2213 OPT ? OPT->getInterfaceType() : BaseType->getAsObjCInterfaceType(); 2214 if (IFaceT) { 2215 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2216 2217 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2218 ObjCInterfaceDecl *ClassDeclared; 2219 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2220 2221 if (IV) { 2222 // If the decl being referenced had an error, return an error for this 2223 // sub-expr without emitting another error, in order to avoid cascading 2224 // error cases. 2225 if (IV->isInvalidDecl()) 2226 return ExprError(); 2227 2228 // Check whether we can reference this field. 2229 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2230 return ExprError(); 2231 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2232 IV->getAccessControl() != ObjCIvarDecl::Package) { 2233 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2234 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2235 ClassOfMethodDecl = MD->getClassInterface(); 2236 else if (ObjCImpDecl && getCurFunctionDecl()) { 2237 // Case of a c-function declared inside an objc implementation. 2238 // FIXME: For a c-style function nested inside an objc implementation 2239 // class, there is no implementation context available, so we pass 2240 // down the context as argument to this routine. Ideally, this context 2241 // need be passed down in the AST node and somehow calculated from the 2242 // AST for a function decl. 2243 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2244 if (ObjCImplementationDecl *IMPD = 2245 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2246 ClassOfMethodDecl = IMPD->getClassInterface(); 2247 else if (ObjCCategoryImplDecl* CatImplClass = 2248 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2249 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2250 } 2251 2252 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2253 if (ClassDeclared != IDecl || 2254 ClassOfMethodDecl != ClassDeclared) 2255 Diag(MemberLoc, diag::error_private_ivar_access) 2256 << IV->getDeclName(); 2257 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2258 // @protected 2259 Diag(MemberLoc, diag::error_protected_ivar_access) 2260 << IV->getDeclName(); 2261 } 2262 2263 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2264 MemberLoc, BaseExpr, 2265 OpKind == tok::arrow)); 2266 } 2267 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2268 << IDecl->getDeclName() << MemberName 2269 << BaseExpr->getSourceRange()); 2270 } 2271 } 2272 // Handle properties on 'id' and qualified "id". 2273 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2274 BaseType->isObjCQualifiedIdType())) { 2275 const ObjCObjectPointerType *QIdTy = BaseType->getAsObjCObjectPointerType(); 2276 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2277 2278 // Check protocols on qualified interfaces. 2279 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2280 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2281 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2282 // Check the use of this declaration 2283 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2284 return ExprError(); 2285 2286 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2287 MemberLoc, BaseExpr)); 2288 } 2289 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2290 // Check the use of this method. 2291 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2292 return ExprError(); 2293 2294 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2295 OMD->getResultType(), 2296 OMD, OpLoc, MemberLoc, 2297 NULL, 0)); 2298 } 2299 } 2300 2301 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2302 << MemberName << BaseType); 2303 } 2304 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2305 // pointer to a (potentially qualified) interface type. 2306 const ObjCObjectPointerType *OPT; 2307 if (OpKind == tok::period && 2308 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2309 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2310 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2311 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2312 2313 // Search for a declared property first. 2314 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2315 // Check whether we can reference this property. 2316 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2317 return ExprError(); 2318 QualType ResTy = PD->getType(); 2319 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2320 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2321 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2322 ResTy = Getter->getResultType(); 2323 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2324 MemberLoc, BaseExpr)); 2325 } 2326 // Check protocols on qualified interfaces. 2327 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2328 E = OPT->qual_end(); I != E; ++I) 2329 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2330 // Check whether we can reference this property. 2331 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2332 return ExprError(); 2333 2334 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2335 MemberLoc, BaseExpr)); 2336 } 2337 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2338 E = OPT->qual_end(); I != E; ++I) 2339 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2340 // Check whether we can reference this property. 2341 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2342 return ExprError(); 2343 2344 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2345 MemberLoc, BaseExpr)); 2346 } 2347 // If that failed, look for an "implicit" property by seeing if the nullary 2348 // selector is implemented. 2349 2350 // FIXME: The logic for looking up nullary and unary selectors should be 2351 // shared with the code in ActOnInstanceMessage. 2352 2353 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2354 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2355 2356 // If this reference is in an @implementation, check for 'private' methods. 2357 if (!Getter) 2358 Getter = FindMethodInNestedImplementations(IFace, Sel); 2359 2360 // Look through local category implementations associated with the class. 2361 if (!Getter) 2362 Getter = IFace->getCategoryInstanceMethod(Sel); 2363 if (Getter) { 2364 // Check if we can reference this property. 2365 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2366 return ExprError(); 2367 } 2368 // If we found a getter then this may be a valid dot-reference, we 2369 // will look for the matching setter, in case it is needed. 2370 Selector SetterSel = 2371 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2372 PP.getSelectorTable(), Member); 2373 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2374 if (!Setter) { 2375 // If this reference is in an @implementation, also check for 'private' 2376 // methods. 2377 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2378 } 2379 // Look through local category implementations associated with the class. 2380 if (!Setter) 2381 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2382 2383 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2384 return ExprError(); 2385 2386 if (Getter || Setter) { 2387 QualType PType; 2388 2389 if (Getter) 2390 PType = Getter->getResultType(); 2391 else 2392 // Get the expression type from Setter's incoming parameter. 2393 PType = (*(Setter->param_end() -1))->getType(); 2394 // FIXME: we must check that the setter has property type. 2395 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2396 Setter, MemberLoc, BaseExpr)); 2397 } 2398 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2399 << MemberName << BaseType); 2400 } 2401 2402 // Handle the following exceptional case (*Obj).isa. 2403 if (OpKind == tok::period && 2404 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2405 MemberName.getAsIdentifierInfo()->isStr("isa")) 2406 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2407 Context.getObjCIdType())); 2408 2409 // Handle 'field access' to vectors, such as 'V.xx'. 2410 if (BaseType->isExtVectorType()) { 2411 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2412 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2413 if (ret.isNull()) 2414 return ExprError(); 2415 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2416 MemberLoc)); 2417 } 2418 2419 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2420 << BaseType << BaseExpr->getSourceRange(); 2421 2422 // If the user is trying to apply -> or . to a function or function 2423 // pointer, it's probably because they forgot parentheses to call 2424 // the function. Suggest the addition of those parentheses. 2425 if (BaseType == Context.OverloadTy || 2426 BaseType->isFunctionType() || 2427 (BaseType->isPointerType() && 2428 BaseType->getAs<PointerType>()->isFunctionType())) { 2429 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2430 Diag(Loc, diag::note_member_reference_needs_call) 2431 << CodeModificationHint::CreateInsertion(Loc, "()"); 2432 } 2433 2434 return ExprError(); 2435} 2436 2437Action::OwningExprResult 2438Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2439 tok::TokenKind OpKind, SourceLocation MemberLoc, 2440 IdentifierInfo &Member, 2441 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2442 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2443 DeclarationName(&Member), ObjCImpDecl, SS); 2444} 2445 2446Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2447 FunctionDecl *FD, 2448 ParmVarDecl *Param) { 2449 if (Param->hasUnparsedDefaultArg()) { 2450 Diag (CallLoc, 2451 diag::err_use_of_default_argument_to_function_declared_later) << 2452 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2453 Diag(UnparsedDefaultArgLocs[Param], 2454 diag::note_default_argument_declared_here); 2455 } else { 2456 if (Param->hasUninstantiatedDefaultArg()) { 2457 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2458 2459 // Instantiate the expression. 2460 const TemplateArgumentList &ArgList = getTemplateInstantiationArgs(FD); 2461 2462 // FIXME: We should really make a new InstantiatingTemplate ctor 2463 // that has a better message - right now we're just piggy-backing 2464 // off the "default template argument" error message. 2465 InstantiatingTemplate Inst(*this, CallLoc, FD->getPrimaryTemplate(), 2466 ArgList.getFlatArgumentList(), 2467 ArgList.flat_size()); 2468 2469 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2470 if (Result.isInvalid()) 2471 return ExprError(); 2472 2473 if (SetParamDefaultArgument(Param, move(Result), 2474 /*FIXME:EqualLoc*/ 2475 UninstExpr->getSourceRange().getBegin())) 2476 return ExprError(); 2477 } 2478 2479 Expr *DefaultExpr = Param->getDefaultArg(); 2480 2481 // If the default expression creates temporaries, we need to 2482 // push them to the current stack of expression temporaries so they'll 2483 // be properly destroyed. 2484 if (CXXExprWithTemporaries *E 2485 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2486 assert(!E->shouldDestroyTemporaries() && 2487 "Can't destroy temporaries in a default argument expr!"); 2488 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2489 ExprTemporaries.push_back(E->getTemporary(I)); 2490 } 2491 } 2492 2493 // We already type-checked the argument, so we know it works. 2494 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2495} 2496 2497/// ConvertArgumentsForCall - Converts the arguments specified in 2498/// Args/NumArgs to the parameter types of the function FDecl with 2499/// function prototype Proto. Call is the call expression itself, and 2500/// Fn is the function expression. For a C++ member function, this 2501/// routine does not attempt to convert the object argument. Returns 2502/// true if the call is ill-formed. 2503bool 2504Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2505 FunctionDecl *FDecl, 2506 const FunctionProtoType *Proto, 2507 Expr **Args, unsigned NumArgs, 2508 SourceLocation RParenLoc) { 2509 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2510 // assignment, to the types of the corresponding parameter, ... 2511 unsigned NumArgsInProto = Proto->getNumArgs(); 2512 unsigned NumArgsToCheck = NumArgs; 2513 bool Invalid = false; 2514 2515 // If too few arguments are available (and we don't have default 2516 // arguments for the remaining parameters), don't make the call. 2517 if (NumArgs < NumArgsInProto) { 2518 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2519 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2520 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2521 // Use default arguments for missing arguments 2522 NumArgsToCheck = NumArgsInProto; 2523 Call->setNumArgs(Context, NumArgsInProto); 2524 } 2525 2526 // If too many are passed and not variadic, error on the extras and drop 2527 // them. 2528 if (NumArgs > NumArgsInProto) { 2529 if (!Proto->isVariadic()) { 2530 Diag(Args[NumArgsInProto]->getLocStart(), 2531 diag::err_typecheck_call_too_many_args) 2532 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2533 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2534 Args[NumArgs-1]->getLocEnd()); 2535 // This deletes the extra arguments. 2536 Call->setNumArgs(Context, NumArgsInProto); 2537 Invalid = true; 2538 } 2539 NumArgsToCheck = NumArgsInProto; 2540 } 2541 2542 // Continue to check argument types (even if we have too few/many args). 2543 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2544 QualType ProtoArgType = Proto->getArgType(i); 2545 2546 Expr *Arg; 2547 if (i < NumArgs) { 2548 Arg = Args[i]; 2549 2550 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2551 ProtoArgType, 2552 diag::err_call_incomplete_argument, 2553 Arg->getSourceRange())) 2554 return true; 2555 2556 // Pass the argument. 2557 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2558 return true; 2559 } else { 2560 ParmVarDecl *Param = FDecl->getParamDecl(i); 2561 2562 OwningExprResult ArgExpr = 2563 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2564 FDecl, Param); 2565 if (ArgExpr.isInvalid()) 2566 return true; 2567 2568 Arg = ArgExpr.takeAs<Expr>(); 2569 } 2570 2571 Call->setArg(i, Arg); 2572 } 2573 2574 // If this is a variadic call, handle args passed through "...". 2575 if (Proto->isVariadic()) { 2576 VariadicCallType CallType = VariadicFunction; 2577 if (Fn->getType()->isBlockPointerType()) 2578 CallType = VariadicBlock; // Block 2579 else if (isa<MemberExpr>(Fn)) 2580 CallType = VariadicMethod; 2581 2582 // Promote the arguments (C99 6.5.2.2p7). 2583 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2584 Expr *Arg = Args[i]; 2585 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2586 Call->setArg(i, Arg); 2587 } 2588 } 2589 2590 return Invalid; 2591} 2592 2593/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2594/// This provides the location of the left/right parens and a list of comma 2595/// locations. 2596Action::OwningExprResult 2597Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2598 MultiExprArg args, 2599 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2600 unsigned NumArgs = args.size(); 2601 2602 // Since this might be a postfix expression, get rid of ParenListExprs. 2603 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2604 2605 Expr *Fn = fn.takeAs<Expr>(); 2606 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2607 assert(Fn && "no function call expression"); 2608 FunctionDecl *FDecl = NULL; 2609 NamedDecl *NDecl = NULL; 2610 DeclarationName UnqualifiedName; 2611 2612 if (getLangOptions().CPlusPlus) { 2613 // Determine whether this is a dependent call inside a C++ template, 2614 // in which case we won't do any semantic analysis now. 2615 // FIXME: Will need to cache the results of name lookup (including ADL) in 2616 // Fn. 2617 bool Dependent = false; 2618 if (Fn->isTypeDependent()) 2619 Dependent = true; 2620 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2621 Dependent = true; 2622 2623 if (Dependent) 2624 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2625 Context.DependentTy, RParenLoc)); 2626 2627 // Determine whether this is a call to an object (C++ [over.call.object]). 2628 if (Fn->getType()->isRecordType()) 2629 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2630 CommaLocs, RParenLoc)); 2631 2632 // Determine whether this is a call to a member function. 2633 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2634 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2635 if (isa<OverloadedFunctionDecl>(MemDecl) || 2636 isa<CXXMethodDecl>(MemDecl) || 2637 (isa<FunctionTemplateDecl>(MemDecl) && 2638 isa<CXXMethodDecl>( 2639 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2640 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2641 CommaLocs, RParenLoc)); 2642 } 2643 } 2644 2645 // If we're directly calling a function, get the appropriate declaration. 2646 // Also, in C++, keep track of whether we should perform argument-dependent 2647 // lookup and whether there were any explicitly-specified template arguments. 2648 Expr *FnExpr = Fn; 2649 bool ADL = true; 2650 bool HasExplicitTemplateArgs = 0; 2651 const TemplateArgument *ExplicitTemplateArgs = 0; 2652 unsigned NumExplicitTemplateArgs = 0; 2653 while (true) { 2654 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2655 FnExpr = IcExpr->getSubExpr(); 2656 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2657 // Parentheses around a function disable ADL 2658 // (C++0x [basic.lookup.argdep]p1). 2659 ADL = false; 2660 FnExpr = PExpr->getSubExpr(); 2661 } else if (isa<UnaryOperator>(FnExpr) && 2662 cast<UnaryOperator>(FnExpr)->getOpcode() 2663 == UnaryOperator::AddrOf) { 2664 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2665 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2666 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2667 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2668 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2669 break; 2670 } else if (UnresolvedFunctionNameExpr *DepName 2671 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2672 UnqualifiedName = DepName->getName(); 2673 break; 2674 } else if (TemplateIdRefExpr *TemplateIdRef 2675 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2676 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2677 if (!NDecl) 2678 NDecl = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2679 HasExplicitTemplateArgs = true; 2680 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2681 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2682 2683 // C++ [temp.arg.explicit]p6: 2684 // [Note: For simple function names, argument dependent lookup (3.4.2) 2685 // applies even when the function name is not visible within the 2686 // scope of the call. This is because the call still has the syntactic 2687 // form of a function call (3.4.1). But when a function template with 2688 // explicit template arguments is used, the call does not have the 2689 // correct syntactic form unless there is a function template with 2690 // that name visible at the point of the call. If no such name is 2691 // visible, the call is not syntactically well-formed and 2692 // argument-dependent lookup does not apply. If some such name is 2693 // visible, argument dependent lookup applies and additional function 2694 // templates may be found in other namespaces. 2695 // 2696 // The summary of this paragraph is that, if we get to this point and the 2697 // template-id was not a qualified name, then argument-dependent lookup 2698 // is still possible. 2699 if (TemplateIdRef->getQualifier()) 2700 ADL = false; 2701 break; 2702 } else { 2703 // Any kind of name that does not refer to a declaration (or 2704 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2705 ADL = false; 2706 break; 2707 } 2708 } 2709 2710 OverloadedFunctionDecl *Ovl = 0; 2711 FunctionTemplateDecl *FunctionTemplate = 0; 2712 if (NDecl) { 2713 FDecl = dyn_cast<FunctionDecl>(NDecl); 2714 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2715 FDecl = FunctionTemplate->getTemplatedDecl(); 2716 else 2717 FDecl = dyn_cast<FunctionDecl>(NDecl); 2718 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2719 } 2720 2721 if (Ovl || FunctionTemplate || 2722 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2723 // We don't perform ADL for implicit declarations of builtins. 2724 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2725 ADL = false; 2726 2727 // We don't perform ADL in C. 2728 if (!getLangOptions().CPlusPlus) 2729 ADL = false; 2730 2731 if (Ovl || FunctionTemplate || ADL) { 2732 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2733 HasExplicitTemplateArgs, 2734 ExplicitTemplateArgs, 2735 NumExplicitTemplateArgs, 2736 LParenLoc, Args, NumArgs, CommaLocs, 2737 RParenLoc, ADL); 2738 if (!FDecl) 2739 return ExprError(); 2740 2741 // Update Fn to refer to the actual function selected. 2742 Expr *NewFn = 0; 2743 if (QualifiedDeclRefExpr *QDRExpr 2744 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2745 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2746 QDRExpr->getLocation(), 2747 false, false, 2748 QDRExpr->getQualifierRange(), 2749 QDRExpr->getQualifier()); 2750 else 2751 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2752 Fn->getSourceRange().getBegin()); 2753 Fn->Destroy(Context); 2754 Fn = NewFn; 2755 } 2756 } 2757 2758 // Promote the function operand. 2759 UsualUnaryConversions(Fn); 2760 2761 // Make the call expr early, before semantic checks. This guarantees cleanup 2762 // of arguments and function on error. 2763 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2764 Args, NumArgs, 2765 Context.BoolTy, 2766 RParenLoc)); 2767 2768 const FunctionType *FuncT; 2769 if (!Fn->getType()->isBlockPointerType()) { 2770 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2771 // have type pointer to function". 2772 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 2773 if (PT == 0) 2774 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2775 << Fn->getType() << Fn->getSourceRange()); 2776 FuncT = PT->getPointeeType()->getAsFunctionType(); 2777 } else { // This is a block call. 2778 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 2779 getAsFunctionType(); 2780 } 2781 if (FuncT == 0) 2782 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2783 << Fn->getType() << Fn->getSourceRange()); 2784 2785 // Check for a valid return type 2786 if (!FuncT->getResultType()->isVoidType() && 2787 RequireCompleteType(Fn->getSourceRange().getBegin(), 2788 FuncT->getResultType(), 2789 diag::err_call_incomplete_return, 2790 TheCall->getSourceRange())) 2791 return ExprError(); 2792 2793 // We know the result type of the call, set it. 2794 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2795 2796 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2797 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2798 RParenLoc)) 2799 return ExprError(); 2800 } else { 2801 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2802 2803 if (FDecl) { 2804 // Check if we have too few/too many template arguments, based 2805 // on our knowledge of the function definition. 2806 const FunctionDecl *Def = 0; 2807 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2808 const FunctionProtoType *Proto = 2809 Def->getType()->getAsFunctionProtoType(); 2810 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2811 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2812 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2813 } 2814 } 2815 } 2816 2817 // Promote the arguments (C99 6.5.2.2p6). 2818 for (unsigned i = 0; i != NumArgs; i++) { 2819 Expr *Arg = Args[i]; 2820 DefaultArgumentPromotion(Arg); 2821 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2822 Arg->getType(), 2823 diag::err_call_incomplete_argument, 2824 Arg->getSourceRange())) 2825 return ExprError(); 2826 TheCall->setArg(i, Arg); 2827 } 2828 } 2829 2830 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2831 if (!Method->isStatic()) 2832 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2833 << Fn->getSourceRange()); 2834 2835 // Check for sentinels 2836 if (NDecl) 2837 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2838 2839 // Do special checking on direct calls to functions. 2840 if (FDecl) { 2841 if (CheckFunctionCall(FDecl, TheCall.get())) 2842 return ExprError(); 2843 2844 if (unsigned BuiltinID = FDecl->getBuiltinID(Context)) 2845 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 2846 } else if (NDecl) { 2847 if (CheckBlockCall(NDecl, TheCall.get())) 2848 return ExprError(); 2849 } 2850 2851 return MaybeBindToTemporary(TheCall.take()); 2852} 2853 2854Action::OwningExprResult 2855Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2856 SourceLocation RParenLoc, ExprArg InitExpr) { 2857 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2858 //FIXME: Preserve type source info. 2859 QualType literalType = GetTypeFromParser(Ty); 2860 // FIXME: put back this assert when initializers are worked out. 2861 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2862 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2863 2864 if (literalType->isArrayType()) { 2865 if (literalType->isVariableArrayType()) 2866 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2867 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2868 } else if (!literalType->isDependentType() && 2869 RequireCompleteType(LParenLoc, literalType, 2870 diag::err_typecheck_decl_incomplete_type, 2871 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2872 return ExprError(); 2873 2874 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2875 DeclarationName(), /*FIXME:DirectInit=*/false)) 2876 return ExprError(); 2877 2878 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2879 if (isFileScope) { // 6.5.2.5p3 2880 if (CheckForConstantInitializer(literalExpr, literalType)) 2881 return ExprError(); 2882 } 2883 InitExpr.release(); 2884 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2885 literalExpr, isFileScope)); 2886} 2887 2888Action::OwningExprResult 2889Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2890 SourceLocation RBraceLoc) { 2891 unsigned NumInit = initlist.size(); 2892 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2893 2894 // Semantic analysis for initializers is done by ActOnDeclarator() and 2895 // CheckInitializer() - it requires knowledge of the object being intialized. 2896 2897 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2898 RBraceLoc); 2899 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2900 return Owned(E); 2901} 2902 2903/// CheckCastTypes - Check type constraints for casting between types. 2904bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 2905 CastExpr::CastKind& Kind, 2906 CXXMethodDecl *& ConversionDecl, 2907 bool FunctionalStyle) { 2908 if (getLangOptions().CPlusPlus) 2909 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 2910 ConversionDecl); 2911 2912 DefaultFunctionArrayConversion(castExpr); 2913 2914 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2915 // type needs to be scalar. 2916 if (castType->isVoidType()) { 2917 // Cast to void allows any expr type. 2918 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2919 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2920 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2921 (castType->isStructureType() || castType->isUnionType())) { 2922 // GCC struct/union extension: allow cast to self. 2923 // FIXME: Check that the cast destination type is complete. 2924 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2925 << castType << castExpr->getSourceRange(); 2926 Kind = CastExpr::CK_NoOp; 2927 } else if (castType->isUnionType()) { 2928 // GCC cast to union extension 2929 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 2930 RecordDecl::field_iterator Field, FieldEnd; 2931 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2932 Field != FieldEnd; ++Field) { 2933 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2934 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2935 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2936 << castExpr->getSourceRange(); 2937 break; 2938 } 2939 } 2940 if (Field == FieldEnd) 2941 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2942 << castExpr->getType() << castExpr->getSourceRange(); 2943 Kind = CastExpr::CK_ToUnion; 2944 } else { 2945 // Reject any other conversions to non-scalar types. 2946 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2947 << castType << castExpr->getSourceRange(); 2948 } 2949 } else if (!castExpr->getType()->isScalarType() && 2950 !castExpr->getType()->isVectorType()) { 2951 return Diag(castExpr->getLocStart(), 2952 diag::err_typecheck_expect_scalar_operand) 2953 << castExpr->getType() << castExpr->getSourceRange(); 2954 } else if (castType->isExtVectorType()) { 2955 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 2956 return true; 2957 } else if (castType->isVectorType()) { 2958 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2959 return true; 2960 } else if (castExpr->getType()->isVectorType()) { 2961 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2962 return true; 2963 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2964 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2965 } else if (!castType->isArithmeticType()) { 2966 QualType castExprType = castExpr->getType(); 2967 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2968 return Diag(castExpr->getLocStart(), 2969 diag::err_cast_pointer_from_non_pointer_int) 2970 << castExprType << castExpr->getSourceRange(); 2971 } else if (!castExpr->getType()->isArithmeticType()) { 2972 if (!castType->isIntegralType() && castType->isArithmeticType()) 2973 return Diag(castExpr->getLocStart(), 2974 diag::err_cast_pointer_to_non_pointer_int) 2975 << castType << castExpr->getSourceRange(); 2976 } 2977 if (isa<ObjCSelectorExpr>(castExpr)) 2978 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2979 return false; 2980} 2981 2982bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2983 assert(VectorTy->isVectorType() && "Not a vector type!"); 2984 2985 if (Ty->isVectorType() || Ty->isIntegerType()) { 2986 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2987 return Diag(R.getBegin(), 2988 Ty->isVectorType() ? 2989 diag::err_invalid_conversion_between_vectors : 2990 diag::err_invalid_conversion_between_vector_and_integer) 2991 << VectorTy << Ty << R; 2992 } else 2993 return Diag(R.getBegin(), 2994 diag::err_invalid_conversion_between_vector_and_scalar) 2995 << VectorTy << Ty << R; 2996 2997 return false; 2998} 2999 3000bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3001 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3002 3003 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3004 // an ExtVectorType. 3005 if (SrcTy->isVectorType()) { 3006 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3007 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3008 << DestTy << SrcTy << R; 3009 return false; 3010 } 3011 3012 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3013 // conversion will take place first from scalar to elt type, and then 3014 // splat from elt type to vector. 3015 if (SrcTy->isPointerType()) 3016 return Diag(R.getBegin(), 3017 diag::err_invalid_conversion_between_vector_and_scalar) 3018 << DestTy << SrcTy << R; 3019 return false; 3020} 3021 3022Action::OwningExprResult 3023Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3024 SourceLocation RParenLoc, ExprArg Op) { 3025 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3026 3027 assert((Ty != 0) && (Op.get() != 0) && 3028 "ActOnCastExpr(): missing type or expr"); 3029 3030 Expr *castExpr = (Expr *)Op.get(); 3031 //FIXME: Preserve type source info. 3032 QualType castType = GetTypeFromParser(Ty); 3033 3034 // If the Expr being casted is a ParenListExpr, handle it specially. 3035 if (isa<ParenListExpr>(castExpr)) 3036 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3037 CXXMethodDecl *ConversionDecl = 0; 3038 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3039 Kind, ConversionDecl)) 3040 return ExprError(); 3041 3042 Op.release(); 3043 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3044 Kind, castExpr, castType, 3045 LParenLoc, RParenLoc)); 3046} 3047 3048/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3049/// of comma binary operators. 3050Action::OwningExprResult 3051Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3052 Expr *expr = EA.takeAs<Expr>(); 3053 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3054 if (!E) 3055 return Owned(expr); 3056 3057 OwningExprResult Result(*this, E->getExpr(0)); 3058 3059 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3060 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3061 Owned(E->getExpr(i))); 3062 3063 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3064} 3065 3066Action::OwningExprResult 3067Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3068 SourceLocation RParenLoc, ExprArg Op, 3069 QualType Ty) { 3070 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3071 3072 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3073 // then handle it as such. 3074 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3075 if (PE->getNumExprs() == 0) { 3076 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3077 return ExprError(); 3078 } 3079 3080 llvm::SmallVector<Expr *, 8> initExprs; 3081 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3082 initExprs.push_back(PE->getExpr(i)); 3083 3084 // FIXME: This means that pretty-printing the final AST will produce curly 3085 // braces instead of the original commas. 3086 Op.release(); 3087 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3088 initExprs.size(), RParenLoc); 3089 E->setType(Ty); 3090 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3091 Owned(E)); 3092 } else { 3093 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3094 // sequence of BinOp comma operators. 3095 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3096 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3097 } 3098} 3099 3100Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3101 SourceLocation R, 3102 MultiExprArg Val) { 3103 unsigned nexprs = Val.size(); 3104 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3105 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3106 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3107 return Owned(expr); 3108} 3109 3110/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3111/// In that case, lhs = cond. 3112/// C99 6.5.15 3113QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3114 SourceLocation QuestionLoc) { 3115 // C++ is sufficiently different to merit its own checker. 3116 if (getLangOptions().CPlusPlus) 3117 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3118 3119 UsualUnaryConversions(Cond); 3120 UsualUnaryConversions(LHS); 3121 UsualUnaryConversions(RHS); 3122 QualType CondTy = Cond->getType(); 3123 QualType LHSTy = LHS->getType(); 3124 QualType RHSTy = RHS->getType(); 3125 3126 // first, check the condition. 3127 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3128 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3129 << CondTy; 3130 return QualType(); 3131 } 3132 3133 // Now check the two expressions. 3134 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3135 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3136 3137 // If both operands have arithmetic type, do the usual arithmetic conversions 3138 // to find a common type: C99 6.5.15p3,5. 3139 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3140 UsualArithmeticConversions(LHS, RHS); 3141 return LHS->getType(); 3142 } 3143 3144 // If both operands are the same structure or union type, the result is that 3145 // type. 3146 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3147 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3148 if (LHSRT->getDecl() == RHSRT->getDecl()) 3149 // "If both the operands have structure or union type, the result has 3150 // that type." This implies that CV qualifiers are dropped. 3151 return LHSTy.getUnqualifiedType(); 3152 // FIXME: Type of conditional expression must be complete in C mode. 3153 } 3154 3155 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3156 // The following || allows only one side to be void (a GCC-ism). 3157 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3158 if (!LHSTy->isVoidType()) 3159 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3160 << RHS->getSourceRange(); 3161 if (!RHSTy->isVoidType()) 3162 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3163 << LHS->getSourceRange(); 3164 ImpCastExprToType(LHS, Context.VoidTy); 3165 ImpCastExprToType(RHS, Context.VoidTy); 3166 return Context.VoidTy; 3167 } 3168 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3169 // the type of the other operand." 3170 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3171 RHS->isNullPointerConstant(Context)) { 3172 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3173 return LHSTy; 3174 } 3175 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3176 LHS->isNullPointerConstant(Context)) { 3177 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3178 return RHSTy; 3179 } 3180 // Handle things like Class and struct objc_class*. Here we case the result 3181 // to the pseudo-builtin, because that will be implicitly cast back to the 3182 // redefinition type if an attempt is made to access its fields. 3183 if (LHSTy->isObjCClassType() && 3184 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3185 ImpCastExprToType(RHS, LHSTy); 3186 return LHSTy; 3187 } 3188 if (RHSTy->isObjCClassType() && 3189 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3190 ImpCastExprToType(LHS, RHSTy); 3191 return RHSTy; 3192 } 3193 // And the same for struct objc_object* / id 3194 if (LHSTy->isObjCIdType() && 3195 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3196 ImpCastExprToType(RHS, LHSTy); 3197 return LHSTy; 3198 } 3199 if (RHSTy->isObjCIdType() && 3200 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3201 ImpCastExprToType(LHS, RHSTy); 3202 return RHSTy; 3203 } 3204 // Handle block pointer types. 3205 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3206 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3207 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3208 QualType destType = Context.getPointerType(Context.VoidTy); 3209 ImpCastExprToType(LHS, destType); 3210 ImpCastExprToType(RHS, destType); 3211 return destType; 3212 } 3213 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3214 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3215 return QualType(); 3216 } 3217 // We have 2 block pointer types. 3218 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3219 // Two identical block pointer types are always compatible. 3220 return LHSTy; 3221 } 3222 // The block pointer types aren't identical, continue checking. 3223 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3224 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3225 3226 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3227 rhptee.getUnqualifiedType())) { 3228 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3229 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3230 // In this situation, we assume void* type. No especially good 3231 // reason, but this is what gcc does, and we do have to pick 3232 // to get a consistent AST. 3233 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3234 ImpCastExprToType(LHS, incompatTy); 3235 ImpCastExprToType(RHS, incompatTy); 3236 return incompatTy; 3237 } 3238 // The block pointer types are compatible. 3239 ImpCastExprToType(LHS, LHSTy); 3240 ImpCastExprToType(RHS, LHSTy); 3241 return LHSTy; 3242 } 3243 // Check constraints for Objective-C object pointers types. 3244 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3245 3246 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3247 // Two identical object pointer types are always compatible. 3248 return LHSTy; 3249 } 3250 const ObjCObjectPointerType *LHSOPT = LHSTy->getAsObjCObjectPointerType(); 3251 const ObjCObjectPointerType *RHSOPT = RHSTy->getAsObjCObjectPointerType(); 3252 QualType compositeType = LHSTy; 3253 3254 // If both operands are interfaces and either operand can be 3255 // assigned to the other, use that type as the composite 3256 // type. This allows 3257 // xxx ? (A*) a : (B*) b 3258 // where B is a subclass of A. 3259 // 3260 // Additionally, as for assignment, if either type is 'id' 3261 // allow silent coercion. Finally, if the types are 3262 // incompatible then make sure to use 'id' as the composite 3263 // type so the result is acceptable for sending messages to. 3264 3265 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3266 // It could return the composite type. 3267 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3268 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3269 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3270 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3271 } else if ((LHSTy->isObjCQualifiedIdType() || 3272 RHSTy->isObjCQualifiedIdType()) && 3273 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3274 // Need to handle "id<xx>" explicitly. 3275 // GCC allows qualified id and any Objective-C type to devolve to 3276 // id. Currently localizing to here until clear this should be 3277 // part of ObjCQualifiedIdTypesAreCompatible. 3278 compositeType = Context.getObjCIdType(); 3279 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3280 compositeType = Context.getObjCIdType(); 3281 } else { 3282 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3283 << LHSTy << RHSTy 3284 << LHS->getSourceRange() << RHS->getSourceRange(); 3285 QualType incompatTy = Context.getObjCIdType(); 3286 ImpCastExprToType(LHS, incompatTy); 3287 ImpCastExprToType(RHS, incompatTy); 3288 return incompatTy; 3289 } 3290 // The object pointer types are compatible. 3291 ImpCastExprToType(LHS, compositeType); 3292 ImpCastExprToType(RHS, compositeType); 3293 return compositeType; 3294 } 3295 // Check Objective-C object pointer types and 'void *' 3296 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3297 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3298 QualType rhptee = RHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3299 QualType destPointee = lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3300 QualType destType = Context.getPointerType(destPointee); 3301 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3302 ImpCastExprToType(RHS, destType); // promote to void* 3303 return destType; 3304 } 3305 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3306 QualType lhptee = LHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3307 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3308 QualType destPointee = rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3309 QualType destType = Context.getPointerType(destPointee); 3310 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3311 ImpCastExprToType(LHS, destType); // promote to void* 3312 return destType; 3313 } 3314 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3315 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3316 // get the "pointed to" types 3317 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3318 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3319 3320 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3321 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3322 // Figure out necessary qualifiers (C99 6.5.15p6) 3323 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3324 QualType destType = Context.getPointerType(destPointee); 3325 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3326 ImpCastExprToType(RHS, destType); // promote to void* 3327 return destType; 3328 } 3329 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3330 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3331 QualType destType = Context.getPointerType(destPointee); 3332 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3333 ImpCastExprToType(RHS, destType); // promote to void* 3334 return destType; 3335 } 3336 3337 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3338 // Two identical pointer types are always compatible. 3339 return LHSTy; 3340 } 3341 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3342 rhptee.getUnqualifiedType())) { 3343 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3344 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3345 // In this situation, we assume void* type. No especially good 3346 // reason, but this is what gcc does, and we do have to pick 3347 // to get a consistent AST. 3348 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3349 ImpCastExprToType(LHS, incompatTy); 3350 ImpCastExprToType(RHS, incompatTy); 3351 return incompatTy; 3352 } 3353 // The pointer types are compatible. 3354 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3355 // differently qualified versions of compatible types, the result type is 3356 // a pointer to an appropriately qualified version of the *composite* 3357 // type. 3358 // FIXME: Need to calculate the composite type. 3359 // FIXME: Need to add qualifiers 3360 ImpCastExprToType(LHS, LHSTy); 3361 ImpCastExprToType(RHS, LHSTy); 3362 return LHSTy; 3363 } 3364 3365 // GCC compatibility: soften pointer/integer mismatch. 3366 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3367 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3368 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3369 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3370 return RHSTy; 3371 } 3372 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3373 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3374 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3375 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3376 return LHSTy; 3377 } 3378 3379 // Otherwise, the operands are not compatible. 3380 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3381 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3382 return QualType(); 3383} 3384 3385/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3386/// in the case of a the GNU conditional expr extension. 3387Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3388 SourceLocation ColonLoc, 3389 ExprArg Cond, ExprArg LHS, 3390 ExprArg RHS) { 3391 Expr *CondExpr = (Expr *) Cond.get(); 3392 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3393 3394 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3395 // was the condition. 3396 bool isLHSNull = LHSExpr == 0; 3397 if (isLHSNull) 3398 LHSExpr = CondExpr; 3399 3400 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3401 RHSExpr, QuestionLoc); 3402 if (result.isNull()) 3403 return ExprError(); 3404 3405 Cond.release(); 3406 LHS.release(); 3407 RHS.release(); 3408 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3409 isLHSNull ? 0 : LHSExpr, 3410 ColonLoc, RHSExpr, result)); 3411} 3412 3413// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3414// being closely modeled after the C99 spec:-). The odd characteristic of this 3415// routine is it effectively iqnores the qualifiers on the top level pointee. 3416// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3417// FIXME: add a couple examples in this comment. 3418Sema::AssignConvertType 3419Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3420 QualType lhptee, rhptee; 3421 3422 if ((lhsType->isObjCClassType() && 3423 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3424 (rhsType->isObjCClassType() && 3425 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3426 return Compatible; 3427 } 3428 3429 // get the "pointed to" type (ignoring qualifiers at the top level) 3430 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3431 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3432 3433 // make sure we operate on the canonical type 3434 lhptee = Context.getCanonicalType(lhptee); 3435 rhptee = Context.getCanonicalType(rhptee); 3436 3437 AssignConvertType ConvTy = Compatible; 3438 3439 // C99 6.5.16.1p1: This following citation is common to constraints 3440 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3441 // qualifiers of the type *pointed to* by the right; 3442 // FIXME: Handle ExtQualType 3443 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3444 ConvTy = CompatiblePointerDiscardsQualifiers; 3445 3446 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3447 // incomplete type and the other is a pointer to a qualified or unqualified 3448 // version of void... 3449 if (lhptee->isVoidType()) { 3450 if (rhptee->isIncompleteOrObjectType()) 3451 return ConvTy; 3452 3453 // As an extension, we allow cast to/from void* to function pointer. 3454 assert(rhptee->isFunctionType()); 3455 return FunctionVoidPointer; 3456 } 3457 3458 if (rhptee->isVoidType()) { 3459 if (lhptee->isIncompleteOrObjectType()) 3460 return ConvTy; 3461 3462 // As an extension, we allow cast to/from void* to function pointer. 3463 assert(lhptee->isFunctionType()); 3464 return FunctionVoidPointer; 3465 } 3466 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3467 // unqualified versions of compatible types, ... 3468 lhptee = lhptee.getUnqualifiedType(); 3469 rhptee = rhptee.getUnqualifiedType(); 3470 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3471 // Check if the pointee types are compatible ignoring the sign. 3472 // We explicitly check for char so that we catch "char" vs 3473 // "unsigned char" on systems where "char" is unsigned. 3474 if (lhptee->isCharType()) { 3475 lhptee = Context.UnsignedCharTy; 3476 } else if (lhptee->isSignedIntegerType()) { 3477 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3478 } 3479 if (rhptee->isCharType()) { 3480 rhptee = Context.UnsignedCharTy; 3481 } else if (rhptee->isSignedIntegerType()) { 3482 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3483 } 3484 if (lhptee == rhptee) { 3485 // Types are compatible ignoring the sign. Qualifier incompatibility 3486 // takes priority over sign incompatibility because the sign 3487 // warning can be disabled. 3488 if (ConvTy != Compatible) 3489 return ConvTy; 3490 return IncompatiblePointerSign; 3491 } 3492 // General pointer incompatibility takes priority over qualifiers. 3493 return IncompatiblePointer; 3494 } 3495 return ConvTy; 3496} 3497 3498/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3499/// block pointer types are compatible or whether a block and normal pointer 3500/// are compatible. It is more restrict than comparing two function pointer 3501// types. 3502Sema::AssignConvertType 3503Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3504 QualType rhsType) { 3505 QualType lhptee, rhptee; 3506 3507 // get the "pointed to" type (ignoring qualifiers at the top level) 3508 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3509 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3510 3511 // make sure we operate on the canonical type 3512 lhptee = Context.getCanonicalType(lhptee); 3513 rhptee = Context.getCanonicalType(rhptee); 3514 3515 AssignConvertType ConvTy = Compatible; 3516 3517 // For blocks we enforce that qualifiers are identical. 3518 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3519 ConvTy = CompatiblePointerDiscardsQualifiers; 3520 3521 if (!Context.typesAreCompatible(lhptee, rhptee)) 3522 return IncompatibleBlockPointer; 3523 return ConvTy; 3524} 3525 3526/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3527/// has code to accommodate several GCC extensions when type checking 3528/// pointers. Here are some objectionable examples that GCC considers warnings: 3529/// 3530/// int a, *pint; 3531/// short *pshort; 3532/// struct foo *pfoo; 3533/// 3534/// pint = pshort; // warning: assignment from incompatible pointer type 3535/// a = pint; // warning: assignment makes integer from pointer without a cast 3536/// pint = a; // warning: assignment makes pointer from integer without a cast 3537/// pint = pfoo; // warning: assignment from incompatible pointer type 3538/// 3539/// As a result, the code for dealing with pointers is more complex than the 3540/// C99 spec dictates. 3541/// 3542Sema::AssignConvertType 3543Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3544 // Get canonical types. We're not formatting these types, just comparing 3545 // them. 3546 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3547 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3548 3549 if (lhsType == rhsType) 3550 return Compatible; // Common case: fast path an exact match. 3551 3552 if ((lhsType->isObjCClassType() && 3553 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3554 (rhsType->isObjCClassType() && 3555 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3556 return Compatible; 3557 } 3558 3559 // If the left-hand side is a reference type, then we are in a 3560 // (rare!) case where we've allowed the use of references in C, 3561 // e.g., as a parameter type in a built-in function. In this case, 3562 // just make sure that the type referenced is compatible with the 3563 // right-hand side type. The caller is responsible for adjusting 3564 // lhsType so that the resulting expression does not have reference 3565 // type. 3566 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3567 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3568 return Compatible; 3569 return Incompatible; 3570 } 3571 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3572 // to the same ExtVector type. 3573 if (lhsType->isExtVectorType()) { 3574 if (rhsType->isExtVectorType()) 3575 return lhsType == rhsType ? Compatible : Incompatible; 3576 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3577 return Compatible; 3578 } 3579 3580 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3581 // If we are allowing lax vector conversions, and LHS and RHS are both 3582 // vectors, the total size only needs to be the same. This is a bitcast; 3583 // no bits are changed but the result type is different. 3584 if (getLangOptions().LaxVectorConversions && 3585 lhsType->isVectorType() && rhsType->isVectorType()) { 3586 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3587 return IncompatibleVectors; 3588 } 3589 return Incompatible; 3590 } 3591 3592 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3593 return Compatible; 3594 3595 if (isa<PointerType>(lhsType)) { 3596 if (rhsType->isIntegerType()) 3597 return IntToPointer; 3598 3599 if (isa<PointerType>(rhsType)) 3600 return CheckPointerTypesForAssignment(lhsType, rhsType); 3601 3602 // In general, C pointers are not compatible with ObjC object pointers. 3603 if (isa<ObjCObjectPointerType>(rhsType)) { 3604 if (lhsType->isVoidPointerType()) // an exception to the rule. 3605 return Compatible; 3606 return IncompatiblePointer; 3607 } 3608 if (rhsType->getAs<BlockPointerType>()) { 3609 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3610 return Compatible; 3611 3612 // Treat block pointers as objects. 3613 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3614 return Compatible; 3615 } 3616 return Incompatible; 3617 } 3618 3619 if (isa<BlockPointerType>(lhsType)) { 3620 if (rhsType->isIntegerType()) 3621 return IntToBlockPointer; 3622 3623 // Treat block pointers as objects. 3624 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3625 return Compatible; 3626 3627 if (rhsType->isBlockPointerType()) 3628 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3629 3630 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3631 if (RHSPT->getPointeeType()->isVoidType()) 3632 return Compatible; 3633 } 3634 return Incompatible; 3635 } 3636 3637 if (isa<ObjCObjectPointerType>(lhsType)) { 3638 if (rhsType->isIntegerType()) 3639 return IntToPointer; 3640 3641 // In general, C pointers are not compatible with ObjC object pointers. 3642 if (isa<PointerType>(rhsType)) { 3643 if (rhsType->isVoidPointerType()) // an exception to the rule. 3644 return Compatible; 3645 return IncompatiblePointer; 3646 } 3647 if (rhsType->isObjCObjectPointerType()) { 3648 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3649 return Compatible; 3650 if (Context.typesAreCompatible(lhsType, rhsType)) 3651 return Compatible; 3652 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3653 return IncompatibleObjCQualifiedId; 3654 return IncompatiblePointer; 3655 } 3656 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3657 if (RHSPT->getPointeeType()->isVoidType()) 3658 return Compatible; 3659 } 3660 // Treat block pointers as objects. 3661 if (rhsType->isBlockPointerType()) 3662 return Compatible; 3663 return Incompatible; 3664 } 3665 if (isa<PointerType>(rhsType)) { 3666 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3667 if (lhsType == Context.BoolTy) 3668 return Compatible; 3669 3670 if (lhsType->isIntegerType()) 3671 return PointerToInt; 3672 3673 if (isa<PointerType>(lhsType)) 3674 return CheckPointerTypesForAssignment(lhsType, rhsType); 3675 3676 if (isa<BlockPointerType>(lhsType) && 3677 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3678 return Compatible; 3679 return Incompatible; 3680 } 3681 if (isa<ObjCObjectPointerType>(rhsType)) { 3682 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3683 if (lhsType == Context.BoolTy) 3684 return Compatible; 3685 3686 if (lhsType->isIntegerType()) 3687 return PointerToInt; 3688 3689 // In general, C pointers are not compatible with ObjC object pointers. 3690 if (isa<PointerType>(lhsType)) { 3691 if (lhsType->isVoidPointerType()) // an exception to the rule. 3692 return Compatible; 3693 return IncompatiblePointer; 3694 } 3695 if (isa<BlockPointerType>(lhsType) && 3696 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3697 return Compatible; 3698 return Incompatible; 3699 } 3700 3701 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3702 if (Context.typesAreCompatible(lhsType, rhsType)) 3703 return Compatible; 3704 } 3705 return Incompatible; 3706} 3707 3708/// \brief Constructs a transparent union from an expression that is 3709/// used to initialize the transparent union. 3710static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3711 QualType UnionType, FieldDecl *Field) { 3712 // Build an initializer list that designates the appropriate member 3713 // of the transparent union. 3714 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3715 &E, 1, 3716 SourceLocation()); 3717 Initializer->setType(UnionType); 3718 Initializer->setInitializedFieldInUnion(Field); 3719 3720 // Build a compound literal constructing a value of the transparent 3721 // union type from this initializer list. 3722 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3723 false); 3724} 3725 3726Sema::AssignConvertType 3727Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3728 QualType FromType = rExpr->getType(); 3729 3730 // If the ArgType is a Union type, we want to handle a potential 3731 // transparent_union GCC extension. 3732 const RecordType *UT = ArgType->getAsUnionType(); 3733 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3734 return Incompatible; 3735 3736 // The field to initialize within the transparent union. 3737 RecordDecl *UD = UT->getDecl(); 3738 FieldDecl *InitField = 0; 3739 // It's compatible if the expression matches any of the fields. 3740 for (RecordDecl::field_iterator it = UD->field_begin(), 3741 itend = UD->field_end(); 3742 it != itend; ++it) { 3743 if (it->getType()->isPointerType()) { 3744 // If the transparent union contains a pointer type, we allow: 3745 // 1) void pointer 3746 // 2) null pointer constant 3747 if (FromType->isPointerType()) 3748 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 3749 ImpCastExprToType(rExpr, it->getType()); 3750 InitField = *it; 3751 break; 3752 } 3753 3754 if (rExpr->isNullPointerConstant(Context)) { 3755 ImpCastExprToType(rExpr, it->getType()); 3756 InitField = *it; 3757 break; 3758 } 3759 } 3760 3761 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3762 == Compatible) { 3763 InitField = *it; 3764 break; 3765 } 3766 } 3767 3768 if (!InitField) 3769 return Incompatible; 3770 3771 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3772 return Compatible; 3773} 3774 3775Sema::AssignConvertType 3776Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3777 if (getLangOptions().CPlusPlus) { 3778 if (!lhsType->isRecordType()) { 3779 // C++ 5.17p3: If the left operand is not of class type, the 3780 // expression is implicitly converted (C++ 4) to the 3781 // cv-unqualified type of the left operand. 3782 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3783 "assigning")) 3784 return Incompatible; 3785 return Compatible; 3786 } 3787 3788 // FIXME: Currently, we fall through and treat C++ classes like C 3789 // structures. 3790 } 3791 3792 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3793 // a null pointer constant. 3794 if ((lhsType->isPointerType() || 3795 lhsType->isObjCObjectPointerType() || 3796 lhsType->isBlockPointerType()) 3797 && rExpr->isNullPointerConstant(Context)) { 3798 ImpCastExprToType(rExpr, lhsType); 3799 return Compatible; 3800 } 3801 3802 // This check seems unnatural, however it is necessary to ensure the proper 3803 // conversion of functions/arrays. If the conversion were done for all 3804 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3805 // expressions that surpress this implicit conversion (&, sizeof). 3806 // 3807 // Suppress this for references: C++ 8.5.3p5. 3808 if (!lhsType->isReferenceType()) 3809 DefaultFunctionArrayConversion(rExpr); 3810 3811 Sema::AssignConvertType result = 3812 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3813 3814 // C99 6.5.16.1p2: The value of the right operand is converted to the 3815 // type of the assignment expression. 3816 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3817 // so that we can use references in built-in functions even in C. 3818 // The getNonReferenceType() call makes sure that the resulting expression 3819 // does not have reference type. 3820 if (result != Incompatible && rExpr->getType() != lhsType) 3821 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3822 return result; 3823} 3824 3825QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3826 Diag(Loc, diag::err_typecheck_invalid_operands) 3827 << lex->getType() << rex->getType() 3828 << lex->getSourceRange() << rex->getSourceRange(); 3829 return QualType(); 3830} 3831 3832inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3833 Expr *&rex) { 3834 // For conversion purposes, we ignore any qualifiers. 3835 // For example, "const float" and "float" are equivalent. 3836 QualType lhsType = 3837 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3838 QualType rhsType = 3839 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3840 3841 // If the vector types are identical, return. 3842 if (lhsType == rhsType) 3843 return lhsType; 3844 3845 // Handle the case of a vector & extvector type of the same size and element 3846 // type. It would be nice if we only had one vector type someday. 3847 if (getLangOptions().LaxVectorConversions) { 3848 // FIXME: Should we warn here? 3849 if (const VectorType *LV = lhsType->getAsVectorType()) { 3850 if (const VectorType *RV = rhsType->getAsVectorType()) 3851 if (LV->getElementType() == RV->getElementType() && 3852 LV->getNumElements() == RV->getNumElements()) { 3853 return lhsType->isExtVectorType() ? lhsType : rhsType; 3854 } 3855 } 3856 } 3857 3858 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 3859 // swap back (so that we don't reverse the inputs to a subtract, for instance. 3860 bool swapped = false; 3861 if (rhsType->isExtVectorType()) { 3862 swapped = true; 3863 std::swap(rex, lex); 3864 std::swap(rhsType, lhsType); 3865 } 3866 3867 // Handle the case of an ext vector and scalar. 3868 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 3869 QualType EltTy = LV->getElementType(); 3870 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 3871 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 3872 ImpCastExprToType(rex, lhsType); 3873 if (swapped) std::swap(rex, lex); 3874 return lhsType; 3875 } 3876 } 3877 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 3878 rhsType->isRealFloatingType()) { 3879 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 3880 ImpCastExprToType(rex, lhsType); 3881 if (swapped) std::swap(rex, lex); 3882 return lhsType; 3883 } 3884 } 3885 } 3886 3887 // Vectors of different size or scalar and non-ext-vector are errors. 3888 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3889 << lex->getType() << rex->getType() 3890 << lex->getSourceRange() << rex->getSourceRange(); 3891 return QualType(); 3892} 3893 3894inline QualType Sema::CheckMultiplyDivideOperands( 3895 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3896{ 3897 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3898 return CheckVectorOperands(Loc, lex, rex); 3899 3900 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3901 3902 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3903 return compType; 3904 return InvalidOperands(Loc, lex, rex); 3905} 3906 3907inline QualType Sema::CheckRemainderOperands( 3908 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3909{ 3910 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3911 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3912 return CheckVectorOperands(Loc, lex, rex); 3913 return InvalidOperands(Loc, lex, rex); 3914 } 3915 3916 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3917 3918 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3919 return compType; 3920 return InvalidOperands(Loc, lex, rex); 3921} 3922 3923inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3924 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3925{ 3926 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3927 QualType compType = CheckVectorOperands(Loc, lex, rex); 3928 if (CompLHSTy) *CompLHSTy = compType; 3929 return compType; 3930 } 3931 3932 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3933 3934 // handle the common case first (both operands are arithmetic). 3935 if (lex->getType()->isArithmeticType() && 3936 rex->getType()->isArithmeticType()) { 3937 if (CompLHSTy) *CompLHSTy = compType; 3938 return compType; 3939 } 3940 3941 // Put any potential pointer into PExp 3942 Expr* PExp = lex, *IExp = rex; 3943 if (IExp->getType()->isAnyPointerType()) 3944 std::swap(PExp, IExp); 3945 3946 if (PExp->getType()->isAnyPointerType()) { 3947 3948 if (IExp->getType()->isIntegerType()) { 3949 QualType PointeeTy = PExp->getType()->getPointeeType(); 3950 3951 // Check for arithmetic on pointers to incomplete types. 3952 if (PointeeTy->isVoidType()) { 3953 if (getLangOptions().CPlusPlus) { 3954 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3955 << lex->getSourceRange() << rex->getSourceRange(); 3956 return QualType(); 3957 } 3958 3959 // GNU extension: arithmetic on pointer to void 3960 Diag(Loc, diag::ext_gnu_void_ptr) 3961 << lex->getSourceRange() << rex->getSourceRange(); 3962 } else if (PointeeTy->isFunctionType()) { 3963 if (getLangOptions().CPlusPlus) { 3964 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3965 << lex->getType() << lex->getSourceRange(); 3966 return QualType(); 3967 } 3968 3969 // GNU extension: arithmetic on pointer to function 3970 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3971 << lex->getType() << lex->getSourceRange(); 3972 } else { 3973 // Check if we require a complete type. 3974 if (((PExp->getType()->isPointerType() && 3975 !PExp->getType()->isDependentType()) || 3976 PExp->getType()->isObjCObjectPointerType()) && 3977 RequireCompleteType(Loc, PointeeTy, 3978 diag::err_typecheck_arithmetic_incomplete_type, 3979 PExp->getSourceRange(), SourceRange(), 3980 PExp->getType())) 3981 return QualType(); 3982 } 3983 // Diagnose bad cases where we step over interface counts. 3984 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3985 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3986 << PointeeTy << PExp->getSourceRange(); 3987 return QualType(); 3988 } 3989 3990 if (CompLHSTy) { 3991 QualType LHSTy = Context.isPromotableBitField(lex); 3992 if (LHSTy.isNull()) { 3993 LHSTy = lex->getType(); 3994 if (LHSTy->isPromotableIntegerType()) 3995 LHSTy = Context.getPromotedIntegerType(LHSTy); 3996 } 3997 *CompLHSTy = LHSTy; 3998 } 3999 return PExp->getType(); 4000 } 4001 } 4002 4003 return InvalidOperands(Loc, lex, rex); 4004} 4005 4006// C99 6.5.6 4007QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4008 SourceLocation Loc, QualType* CompLHSTy) { 4009 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4010 QualType compType = CheckVectorOperands(Loc, lex, rex); 4011 if (CompLHSTy) *CompLHSTy = compType; 4012 return compType; 4013 } 4014 4015 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4016 4017 // Enforce type constraints: C99 6.5.6p3. 4018 4019 // Handle the common case first (both operands are arithmetic). 4020 if (lex->getType()->isArithmeticType() 4021 && rex->getType()->isArithmeticType()) { 4022 if (CompLHSTy) *CompLHSTy = compType; 4023 return compType; 4024 } 4025 4026 // Either ptr - int or ptr - ptr. 4027 if (lex->getType()->isAnyPointerType()) { 4028 QualType lpointee = lex->getType()->getPointeeType(); 4029 4030 // The LHS must be an completely-defined object type. 4031 4032 bool ComplainAboutVoid = false; 4033 Expr *ComplainAboutFunc = 0; 4034 if (lpointee->isVoidType()) { 4035 if (getLangOptions().CPlusPlus) { 4036 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4037 << lex->getSourceRange() << rex->getSourceRange(); 4038 return QualType(); 4039 } 4040 4041 // GNU C extension: arithmetic on pointer to void 4042 ComplainAboutVoid = true; 4043 } else if (lpointee->isFunctionType()) { 4044 if (getLangOptions().CPlusPlus) { 4045 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4046 << lex->getType() << lex->getSourceRange(); 4047 return QualType(); 4048 } 4049 4050 // GNU C extension: arithmetic on pointer to function 4051 ComplainAboutFunc = lex; 4052 } else if (!lpointee->isDependentType() && 4053 RequireCompleteType(Loc, lpointee, 4054 diag::err_typecheck_sub_ptr_object, 4055 lex->getSourceRange(), 4056 SourceRange(), 4057 lex->getType())) 4058 return QualType(); 4059 4060 // Diagnose bad cases where we step over interface counts. 4061 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4062 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4063 << lpointee << lex->getSourceRange(); 4064 return QualType(); 4065 } 4066 4067 // The result type of a pointer-int computation is the pointer type. 4068 if (rex->getType()->isIntegerType()) { 4069 if (ComplainAboutVoid) 4070 Diag(Loc, diag::ext_gnu_void_ptr) 4071 << lex->getSourceRange() << rex->getSourceRange(); 4072 if (ComplainAboutFunc) 4073 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4074 << ComplainAboutFunc->getType() 4075 << ComplainAboutFunc->getSourceRange(); 4076 4077 if (CompLHSTy) *CompLHSTy = lex->getType(); 4078 return lex->getType(); 4079 } 4080 4081 // Handle pointer-pointer subtractions. 4082 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4083 QualType rpointee = RHSPTy->getPointeeType(); 4084 4085 // RHS must be a completely-type object type. 4086 // Handle the GNU void* extension. 4087 if (rpointee->isVoidType()) { 4088 if (getLangOptions().CPlusPlus) { 4089 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4090 << lex->getSourceRange() << rex->getSourceRange(); 4091 return QualType(); 4092 } 4093 4094 ComplainAboutVoid = true; 4095 } else if (rpointee->isFunctionType()) { 4096 if (getLangOptions().CPlusPlus) { 4097 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4098 << rex->getType() << rex->getSourceRange(); 4099 return QualType(); 4100 } 4101 4102 // GNU extension: arithmetic on pointer to function 4103 if (!ComplainAboutFunc) 4104 ComplainAboutFunc = rex; 4105 } else if (!rpointee->isDependentType() && 4106 RequireCompleteType(Loc, rpointee, 4107 diag::err_typecheck_sub_ptr_object, 4108 rex->getSourceRange(), 4109 SourceRange(), 4110 rex->getType())) 4111 return QualType(); 4112 4113 if (getLangOptions().CPlusPlus) { 4114 // Pointee types must be the same: C++ [expr.add] 4115 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4116 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4117 << lex->getType() << rex->getType() 4118 << lex->getSourceRange() << rex->getSourceRange(); 4119 return QualType(); 4120 } 4121 } else { 4122 // Pointee types must be compatible C99 6.5.6p3 4123 if (!Context.typesAreCompatible( 4124 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4125 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4126 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4127 << lex->getType() << rex->getType() 4128 << lex->getSourceRange() << rex->getSourceRange(); 4129 return QualType(); 4130 } 4131 } 4132 4133 if (ComplainAboutVoid) 4134 Diag(Loc, diag::ext_gnu_void_ptr) 4135 << lex->getSourceRange() << rex->getSourceRange(); 4136 if (ComplainAboutFunc) 4137 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4138 << ComplainAboutFunc->getType() 4139 << ComplainAboutFunc->getSourceRange(); 4140 4141 if (CompLHSTy) *CompLHSTy = lex->getType(); 4142 return Context.getPointerDiffType(); 4143 } 4144 } 4145 4146 return InvalidOperands(Loc, lex, rex); 4147} 4148 4149// C99 6.5.7 4150QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4151 bool isCompAssign) { 4152 // C99 6.5.7p2: Each of the operands shall have integer type. 4153 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4154 return InvalidOperands(Loc, lex, rex); 4155 4156 // Shifts don't perform usual arithmetic conversions, they just do integer 4157 // promotions on each operand. C99 6.5.7p3 4158 QualType LHSTy = Context.isPromotableBitField(lex); 4159 if (LHSTy.isNull()) { 4160 LHSTy = lex->getType(); 4161 if (LHSTy->isPromotableIntegerType()) 4162 LHSTy = Context.getPromotedIntegerType(LHSTy); 4163 } 4164 if (!isCompAssign) 4165 ImpCastExprToType(lex, LHSTy); 4166 4167 UsualUnaryConversions(rex); 4168 4169 // Sanity-check shift operands 4170 llvm::APSInt Right; 4171 // Check right/shifter operand 4172 if (rex->isIntegerConstantExpr(Right, Context)) { 4173 if (Right.isNegative()) 4174 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4175 else { 4176 llvm::APInt LeftBits(Right.getBitWidth(), 4177 Context.getTypeSize(lex->getType())); 4178 if (Right.uge(LeftBits)) 4179 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4180 } 4181 } 4182 4183 // "The type of the result is that of the promoted left operand." 4184 return LHSTy; 4185} 4186 4187// C99 6.5.8, C++ [expr.rel] 4188QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4189 unsigned OpaqueOpc, bool isRelational) { 4190 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4191 4192 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4193 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4194 4195 // C99 6.5.8p3 / C99 6.5.9p4 4196 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4197 UsualArithmeticConversions(lex, rex); 4198 else { 4199 UsualUnaryConversions(lex); 4200 UsualUnaryConversions(rex); 4201 } 4202 QualType lType = lex->getType(); 4203 QualType rType = rex->getType(); 4204 4205 if (!lType->isFloatingType() 4206 && !(lType->isBlockPointerType() && isRelational)) { 4207 // For non-floating point types, check for self-comparisons of the form 4208 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4209 // often indicate logic errors in the program. 4210 // NOTE: Don't warn about comparisons of enum constants. These can arise 4211 // from macro expansions, and are usually quite deliberate. 4212 Expr *LHSStripped = lex->IgnoreParens(); 4213 Expr *RHSStripped = rex->IgnoreParens(); 4214 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4215 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4216 if (DRL->getDecl() == DRR->getDecl() && 4217 !isa<EnumConstantDecl>(DRL->getDecl())) 4218 Diag(Loc, diag::warn_selfcomparison); 4219 4220 if (isa<CastExpr>(LHSStripped)) 4221 LHSStripped = LHSStripped->IgnoreParenCasts(); 4222 if (isa<CastExpr>(RHSStripped)) 4223 RHSStripped = RHSStripped->IgnoreParenCasts(); 4224 4225 // Warn about comparisons against a string constant (unless the other 4226 // operand is null), the user probably wants strcmp. 4227 Expr *literalString = 0; 4228 Expr *literalStringStripped = 0; 4229 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4230 !RHSStripped->isNullPointerConstant(Context)) { 4231 literalString = lex; 4232 literalStringStripped = LHSStripped; 4233 } else if ((isa<StringLiteral>(RHSStripped) || 4234 isa<ObjCEncodeExpr>(RHSStripped)) && 4235 !LHSStripped->isNullPointerConstant(Context)) { 4236 literalString = rex; 4237 literalStringStripped = RHSStripped; 4238 } 4239 4240 if (literalString) { 4241 std::string resultComparison; 4242 switch (Opc) { 4243 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4244 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4245 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4246 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4247 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4248 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4249 default: assert(false && "Invalid comparison operator"); 4250 } 4251 Diag(Loc, diag::warn_stringcompare) 4252 << isa<ObjCEncodeExpr>(literalStringStripped) 4253 << literalString->getSourceRange() 4254 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4255 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4256 "strcmp(") 4257 << CodeModificationHint::CreateInsertion( 4258 PP.getLocForEndOfToken(rex->getLocEnd()), 4259 resultComparison); 4260 } 4261 } 4262 4263 // The result of comparisons is 'bool' in C++, 'int' in C. 4264 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4265 4266 if (isRelational) { 4267 if (lType->isRealType() && rType->isRealType()) 4268 return ResultTy; 4269 } else { 4270 // Check for comparisons of floating point operands using != and ==. 4271 if (lType->isFloatingType()) { 4272 assert(rType->isFloatingType()); 4273 CheckFloatComparison(Loc,lex,rex); 4274 } 4275 4276 if (lType->isArithmeticType() && rType->isArithmeticType()) 4277 return ResultTy; 4278 } 4279 4280 bool LHSIsNull = lex->isNullPointerConstant(Context); 4281 bool RHSIsNull = rex->isNullPointerConstant(Context); 4282 4283 // All of the following pointer related warnings are GCC extensions, except 4284 // when handling null pointer constants. One day, we can consider making them 4285 // errors (when -pedantic-errors is enabled). 4286 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4287 QualType LCanPointeeTy = 4288 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4289 QualType RCanPointeeTy = 4290 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4291 4292 if (getLangOptions().CPlusPlus) { 4293 if (LCanPointeeTy == RCanPointeeTy) 4294 return ResultTy; 4295 4296 // C++ [expr.rel]p2: 4297 // [...] Pointer conversions (4.10) and qualification 4298 // conversions (4.4) are performed on pointer operands (or on 4299 // a pointer operand and a null pointer constant) to bring 4300 // them to their composite pointer type. [...] 4301 // 4302 // C++ [expr.eq]p1 uses the same notion for (in)equality 4303 // comparisons of pointers. 4304 QualType T = FindCompositePointerType(lex, rex); 4305 if (T.isNull()) { 4306 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4307 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4308 return QualType(); 4309 } 4310 4311 ImpCastExprToType(lex, T); 4312 ImpCastExprToType(rex, T); 4313 return ResultTy; 4314 } 4315 // C99 6.5.9p2 and C99 6.5.8p2 4316 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4317 RCanPointeeTy.getUnqualifiedType())) { 4318 // Valid unless a relational comparison of function pointers 4319 if (isRelational && LCanPointeeTy->isFunctionType()) { 4320 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4321 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4322 } 4323 } else if (!isRelational && 4324 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4325 // Valid unless comparison between non-null pointer and function pointer 4326 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4327 && !LHSIsNull && !RHSIsNull) { 4328 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4329 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4330 } 4331 } else { 4332 // Invalid 4333 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4334 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4335 } 4336 if (LCanPointeeTy != RCanPointeeTy) 4337 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4338 return ResultTy; 4339 } 4340 4341 if (getLangOptions().CPlusPlus) { 4342 // Comparison of pointers with null pointer constants and equality 4343 // comparisons of member pointers to null pointer constants. 4344 if (RHSIsNull && 4345 (lType->isPointerType() || 4346 (!isRelational && lType->isMemberPointerType()))) { 4347 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4348 return ResultTy; 4349 } 4350 if (LHSIsNull && 4351 (rType->isPointerType() || 4352 (!isRelational && rType->isMemberPointerType()))) { 4353 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4354 return ResultTy; 4355 } 4356 4357 // Comparison of member pointers. 4358 if (!isRelational && 4359 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4360 // C++ [expr.eq]p2: 4361 // In addition, pointers to members can be compared, or a pointer to 4362 // member and a null pointer constant. Pointer to member conversions 4363 // (4.11) and qualification conversions (4.4) are performed to bring 4364 // them to a common type. If one operand is a null pointer constant, 4365 // the common type is the type of the other operand. Otherwise, the 4366 // common type is a pointer to member type similar (4.4) to the type 4367 // of one of the operands, with a cv-qualification signature (4.4) 4368 // that is the union of the cv-qualification signatures of the operand 4369 // types. 4370 QualType T = FindCompositePointerType(lex, rex); 4371 if (T.isNull()) { 4372 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4373 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4374 return QualType(); 4375 } 4376 4377 ImpCastExprToType(lex, T); 4378 ImpCastExprToType(rex, T); 4379 return ResultTy; 4380 } 4381 4382 // Comparison of nullptr_t with itself. 4383 if (lType->isNullPtrType() && rType->isNullPtrType()) 4384 return ResultTy; 4385 } 4386 4387 // Handle block pointer types. 4388 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4389 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4390 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4391 4392 if (!LHSIsNull && !RHSIsNull && 4393 !Context.typesAreCompatible(lpointee, rpointee)) { 4394 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4395 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4396 } 4397 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4398 return ResultTy; 4399 } 4400 // Allow block pointers to be compared with null pointer constants. 4401 if (!isRelational 4402 && ((lType->isBlockPointerType() && rType->isPointerType()) 4403 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4404 if (!LHSIsNull && !RHSIsNull) { 4405 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4406 ->getPointeeType()->isVoidType()) 4407 || (lType->isPointerType() && lType->getAs<PointerType>() 4408 ->getPointeeType()->isVoidType()))) 4409 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4410 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4411 } 4412 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4413 return ResultTy; 4414 } 4415 4416 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4417 if (lType->isPointerType() || rType->isPointerType()) { 4418 const PointerType *LPT = lType->getAs<PointerType>(); 4419 const PointerType *RPT = rType->getAs<PointerType>(); 4420 bool LPtrToVoid = LPT ? 4421 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4422 bool RPtrToVoid = RPT ? 4423 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4424 4425 if (!LPtrToVoid && !RPtrToVoid && 4426 !Context.typesAreCompatible(lType, rType)) { 4427 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4428 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4429 } 4430 ImpCastExprToType(rex, lType); 4431 return ResultTy; 4432 } 4433 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4434 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4435 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4436 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4437 ImpCastExprToType(rex, lType); 4438 return ResultTy; 4439 } 4440 } 4441 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4442 unsigned DiagID = 0; 4443 if (RHSIsNull) { 4444 if (isRelational) 4445 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4446 } else if (isRelational) 4447 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4448 else 4449 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4450 4451 if (DiagID) { 4452 Diag(Loc, DiagID) 4453 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4454 } 4455 ImpCastExprToType(rex, lType); // promote the integer to pointer 4456 return ResultTy; 4457 } 4458 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4459 unsigned DiagID = 0; 4460 if (LHSIsNull) { 4461 if (isRelational) 4462 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4463 } else if (isRelational) 4464 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4465 else 4466 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4467 4468 if (DiagID) { 4469 Diag(Loc, DiagID) 4470 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4471 } 4472 ImpCastExprToType(lex, rType); // promote the integer to pointer 4473 return ResultTy; 4474 } 4475 // Handle block pointers. 4476 if (!isRelational && RHSIsNull 4477 && lType->isBlockPointerType() && rType->isIntegerType()) { 4478 ImpCastExprToType(rex, lType); // promote the integer to pointer 4479 return ResultTy; 4480 } 4481 if (!isRelational && LHSIsNull 4482 && lType->isIntegerType() && rType->isBlockPointerType()) { 4483 ImpCastExprToType(lex, rType); // promote the integer to pointer 4484 return ResultTy; 4485 } 4486 return InvalidOperands(Loc, lex, rex); 4487} 4488 4489/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4490/// operates on extended vector types. Instead of producing an IntTy result, 4491/// like a scalar comparison, a vector comparison produces a vector of integer 4492/// types. 4493QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4494 SourceLocation Loc, 4495 bool isRelational) { 4496 // Check to make sure we're operating on vectors of the same type and width, 4497 // Allowing one side to be a scalar of element type. 4498 QualType vType = CheckVectorOperands(Loc, lex, rex); 4499 if (vType.isNull()) 4500 return vType; 4501 4502 QualType lType = lex->getType(); 4503 QualType rType = rex->getType(); 4504 4505 // For non-floating point types, check for self-comparisons of the form 4506 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4507 // often indicate logic errors in the program. 4508 if (!lType->isFloatingType()) { 4509 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4510 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4511 if (DRL->getDecl() == DRR->getDecl()) 4512 Diag(Loc, diag::warn_selfcomparison); 4513 } 4514 4515 // Check for comparisons of floating point operands using != and ==. 4516 if (!isRelational && lType->isFloatingType()) { 4517 assert (rType->isFloatingType()); 4518 CheckFloatComparison(Loc,lex,rex); 4519 } 4520 4521 // Return the type for the comparison, which is the same as vector type for 4522 // integer vectors, or an integer type of identical size and number of 4523 // elements for floating point vectors. 4524 if (lType->isIntegerType()) 4525 return lType; 4526 4527 const VectorType *VTy = lType->getAsVectorType(); 4528 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4529 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4530 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4531 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4532 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4533 4534 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4535 "Unhandled vector element size in vector compare"); 4536 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4537} 4538 4539inline QualType Sema::CheckBitwiseOperands( 4540 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4541{ 4542 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4543 return CheckVectorOperands(Loc, lex, rex); 4544 4545 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4546 4547 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4548 return compType; 4549 return InvalidOperands(Loc, lex, rex); 4550} 4551 4552inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4553 Expr *&lex, Expr *&rex, SourceLocation Loc) 4554{ 4555 UsualUnaryConversions(lex); 4556 UsualUnaryConversions(rex); 4557 4558 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4559 return Context.IntTy; 4560 return InvalidOperands(Loc, lex, rex); 4561} 4562 4563/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4564/// is a read-only property; return true if so. A readonly property expression 4565/// depends on various declarations and thus must be treated specially. 4566/// 4567static bool IsReadonlyProperty(Expr *E, Sema &S) 4568{ 4569 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4570 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4571 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4572 QualType BaseType = PropExpr->getBase()->getType(); 4573 if (const ObjCObjectPointerType *OPT = 4574 BaseType->getAsObjCInterfacePointerType()) 4575 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4576 if (S.isPropertyReadonly(PDecl, IFace)) 4577 return true; 4578 } 4579 } 4580 return false; 4581} 4582 4583/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4584/// emit an error and return true. If so, return false. 4585static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4586 SourceLocation OrigLoc = Loc; 4587 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4588 &Loc); 4589 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4590 IsLV = Expr::MLV_ReadonlyProperty; 4591 if (IsLV == Expr::MLV_Valid) 4592 return false; 4593 4594 unsigned Diag = 0; 4595 bool NeedType = false; 4596 switch (IsLV) { // C99 6.5.16p2 4597 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4598 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4599 case Expr::MLV_ArrayType: 4600 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4601 NeedType = true; 4602 break; 4603 case Expr::MLV_NotObjectType: 4604 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4605 NeedType = true; 4606 break; 4607 case Expr::MLV_LValueCast: 4608 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4609 break; 4610 case Expr::MLV_InvalidExpression: 4611 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4612 break; 4613 case Expr::MLV_IncompleteType: 4614 case Expr::MLV_IncompleteVoidType: 4615 return S.RequireCompleteType(Loc, E->getType(), 4616 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4617 E->getSourceRange()); 4618 case Expr::MLV_DuplicateVectorComponents: 4619 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4620 break; 4621 case Expr::MLV_NotBlockQualified: 4622 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4623 break; 4624 case Expr::MLV_ReadonlyProperty: 4625 Diag = diag::error_readonly_property_assignment; 4626 break; 4627 case Expr::MLV_NoSetterProperty: 4628 Diag = diag::error_nosetter_property_assignment; 4629 break; 4630 } 4631 4632 SourceRange Assign; 4633 if (Loc != OrigLoc) 4634 Assign = SourceRange(OrigLoc, OrigLoc); 4635 if (NeedType) 4636 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4637 else 4638 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4639 return true; 4640} 4641 4642 4643 4644// C99 6.5.16.1 4645QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4646 SourceLocation Loc, 4647 QualType CompoundType) { 4648 // Verify that LHS is a modifiable lvalue, and emit error if not. 4649 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4650 return QualType(); 4651 4652 QualType LHSType = LHS->getType(); 4653 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4654 4655 AssignConvertType ConvTy; 4656 if (CompoundType.isNull()) { 4657 // Simple assignment "x = y". 4658 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4659 // Special case of NSObject attributes on c-style pointer types. 4660 if (ConvTy == IncompatiblePointer && 4661 ((Context.isObjCNSObjectType(LHSType) && 4662 RHSType->isObjCObjectPointerType()) || 4663 (Context.isObjCNSObjectType(RHSType) && 4664 LHSType->isObjCObjectPointerType()))) 4665 ConvTy = Compatible; 4666 4667 // If the RHS is a unary plus or minus, check to see if they = and + are 4668 // right next to each other. If so, the user may have typo'd "x =+ 4" 4669 // instead of "x += 4". 4670 Expr *RHSCheck = RHS; 4671 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4672 RHSCheck = ICE->getSubExpr(); 4673 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4674 if ((UO->getOpcode() == UnaryOperator::Plus || 4675 UO->getOpcode() == UnaryOperator::Minus) && 4676 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4677 // Only if the two operators are exactly adjacent. 4678 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4679 // And there is a space or other character before the subexpr of the 4680 // unary +/-. We don't want to warn on "x=-1". 4681 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4682 UO->getSubExpr()->getLocStart().isFileID()) { 4683 Diag(Loc, diag::warn_not_compound_assign) 4684 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4685 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4686 } 4687 } 4688 } else { 4689 // Compound assignment "x += y" 4690 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4691 } 4692 4693 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4694 RHS, "assigning")) 4695 return QualType(); 4696 4697 // C99 6.5.16p3: The type of an assignment expression is the type of the 4698 // left operand unless the left operand has qualified type, in which case 4699 // it is the unqualified version of the type of the left operand. 4700 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4701 // is converted to the type of the assignment expression (above). 4702 // C++ 5.17p1: the type of the assignment expression is that of its left 4703 // operand. 4704 return LHSType.getUnqualifiedType(); 4705} 4706 4707// C99 6.5.17 4708QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4709 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4710 DefaultFunctionArrayConversion(RHS); 4711 4712 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4713 // incomplete in C++). 4714 4715 return RHS->getType(); 4716} 4717 4718/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4719/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4720QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4721 bool isInc) { 4722 if (Op->isTypeDependent()) 4723 return Context.DependentTy; 4724 4725 QualType ResType = Op->getType(); 4726 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4727 4728 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4729 // Decrement of bool is not allowed. 4730 if (!isInc) { 4731 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4732 return QualType(); 4733 } 4734 // Increment of bool sets it to true, but is deprecated. 4735 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4736 } else if (ResType->isRealType()) { 4737 // OK! 4738 } else if (ResType->isAnyPointerType()) { 4739 QualType PointeeTy = ResType->getPointeeType(); 4740 4741 // C99 6.5.2.4p2, 6.5.6p2 4742 if (PointeeTy->isVoidType()) { 4743 if (getLangOptions().CPlusPlus) { 4744 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4745 << Op->getSourceRange(); 4746 return QualType(); 4747 } 4748 4749 // Pointer to void is a GNU extension in C. 4750 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4751 } else if (PointeeTy->isFunctionType()) { 4752 if (getLangOptions().CPlusPlus) { 4753 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4754 << Op->getType() << Op->getSourceRange(); 4755 return QualType(); 4756 } 4757 4758 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4759 << ResType << Op->getSourceRange(); 4760 } else if (RequireCompleteType(OpLoc, PointeeTy, 4761 diag::err_typecheck_arithmetic_incomplete_type, 4762 Op->getSourceRange(), SourceRange(), 4763 ResType)) 4764 return QualType(); 4765 // Diagnose bad cases where we step over interface counts. 4766 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4767 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 4768 << PointeeTy << Op->getSourceRange(); 4769 return QualType(); 4770 } 4771 } else if (ResType->isComplexType()) { 4772 // C99 does not support ++/-- on complex types, we allow as an extension. 4773 Diag(OpLoc, diag::ext_integer_increment_complex) 4774 << ResType << Op->getSourceRange(); 4775 } else { 4776 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4777 << ResType << Op->getSourceRange(); 4778 return QualType(); 4779 } 4780 // At this point, we know we have a real, complex or pointer type. 4781 // Now make sure the operand is a modifiable lvalue. 4782 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4783 return QualType(); 4784 return ResType; 4785} 4786 4787/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4788/// This routine allows us to typecheck complex/recursive expressions 4789/// where the declaration is needed for type checking. We only need to 4790/// handle cases when the expression references a function designator 4791/// or is an lvalue. Here are some examples: 4792/// - &(x) => x 4793/// - &*****f => f for f a function designator. 4794/// - &s.xx => s 4795/// - &s.zz[1].yy -> s, if zz is an array 4796/// - *(x + 1) -> x, if x is an array 4797/// - &"123"[2] -> 0 4798/// - & __real__ x -> x 4799static NamedDecl *getPrimaryDecl(Expr *E) { 4800 switch (E->getStmtClass()) { 4801 case Stmt::DeclRefExprClass: 4802 case Stmt::QualifiedDeclRefExprClass: 4803 return cast<DeclRefExpr>(E)->getDecl(); 4804 case Stmt::MemberExprClass: 4805 // If this is an arrow operator, the address is an offset from 4806 // the base's value, so the object the base refers to is 4807 // irrelevant. 4808 if (cast<MemberExpr>(E)->isArrow()) 4809 return 0; 4810 // Otherwise, the expression refers to a part of the base 4811 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4812 case Stmt::ArraySubscriptExprClass: { 4813 // FIXME: This code shouldn't be necessary! We should catch the implicit 4814 // promotion of register arrays earlier. 4815 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4816 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4817 if (ICE->getSubExpr()->getType()->isArrayType()) 4818 return getPrimaryDecl(ICE->getSubExpr()); 4819 } 4820 return 0; 4821 } 4822 case Stmt::UnaryOperatorClass: { 4823 UnaryOperator *UO = cast<UnaryOperator>(E); 4824 4825 switch(UO->getOpcode()) { 4826 case UnaryOperator::Real: 4827 case UnaryOperator::Imag: 4828 case UnaryOperator::Extension: 4829 return getPrimaryDecl(UO->getSubExpr()); 4830 default: 4831 return 0; 4832 } 4833 } 4834 case Stmt::ParenExprClass: 4835 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4836 case Stmt::ImplicitCastExprClass: 4837 // If the result of an implicit cast is an l-value, we care about 4838 // the sub-expression; otherwise, the result here doesn't matter. 4839 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4840 default: 4841 return 0; 4842 } 4843} 4844 4845/// CheckAddressOfOperand - The operand of & must be either a function 4846/// designator or an lvalue designating an object. If it is an lvalue, the 4847/// object cannot be declared with storage class register or be a bit field. 4848/// Note: The usual conversions are *not* applied to the operand of the & 4849/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4850/// In C++, the operand might be an overloaded function name, in which case 4851/// we allow the '&' but retain the overloaded-function type. 4852QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4853 // Make sure to ignore parentheses in subsequent checks 4854 op = op->IgnoreParens(); 4855 4856 if (op->isTypeDependent()) 4857 return Context.DependentTy; 4858 4859 if (getLangOptions().C99) { 4860 // Implement C99-only parts of addressof rules. 4861 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4862 if (uOp->getOpcode() == UnaryOperator::Deref) 4863 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4864 // (assuming the deref expression is valid). 4865 return uOp->getSubExpr()->getType(); 4866 } 4867 // Technically, there should be a check for array subscript 4868 // expressions here, but the result of one is always an lvalue anyway. 4869 } 4870 NamedDecl *dcl = getPrimaryDecl(op); 4871 Expr::isLvalueResult lval = op->isLvalue(Context); 4872 4873 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4874 // C99 6.5.3.2p1 4875 // The operand must be either an l-value or a function designator 4876 if (!op->getType()->isFunctionType()) { 4877 // FIXME: emit more specific diag... 4878 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4879 << op->getSourceRange(); 4880 return QualType(); 4881 } 4882 } else if (op->getBitField()) { // C99 6.5.3.2p1 4883 // The operand cannot be a bit-field 4884 Diag(OpLoc, diag::err_typecheck_address_of) 4885 << "bit-field" << op->getSourceRange(); 4886 return QualType(); 4887 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4888 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4889 // The operand cannot be an element of a vector 4890 Diag(OpLoc, diag::err_typecheck_address_of) 4891 << "vector element" << op->getSourceRange(); 4892 return QualType(); 4893 } else if (isa<ObjCPropertyRefExpr>(op)) { 4894 // cannot take address of a property expression. 4895 Diag(OpLoc, diag::err_typecheck_address_of) 4896 << "property expression" << op->getSourceRange(); 4897 return QualType(); 4898 } else if (dcl) { // C99 6.5.3.2p1 4899 // We have an lvalue with a decl. Make sure the decl is not declared 4900 // with the register storage-class specifier. 4901 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4902 if (vd->getStorageClass() == VarDecl::Register) { 4903 Diag(OpLoc, diag::err_typecheck_address_of) 4904 << "register variable" << op->getSourceRange(); 4905 return QualType(); 4906 } 4907 } else if (isa<OverloadedFunctionDecl>(dcl) || 4908 isa<FunctionTemplateDecl>(dcl)) { 4909 return Context.OverloadTy; 4910 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 4911 // Okay: we can take the address of a field. 4912 // Could be a pointer to member, though, if there is an explicit 4913 // scope qualifier for the class. 4914 if (isa<QualifiedDeclRefExpr>(op)) { 4915 DeclContext *Ctx = dcl->getDeclContext(); 4916 if (Ctx && Ctx->isRecord()) { 4917 if (FD->getType()->isReferenceType()) { 4918 Diag(OpLoc, 4919 diag::err_cannot_form_pointer_to_member_of_reference_type) 4920 << FD->getDeclName() << FD->getType(); 4921 return QualType(); 4922 } 4923 4924 return Context.getMemberPointerType(op->getType(), 4925 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4926 } 4927 } 4928 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4929 // Okay: we can take the address of a function. 4930 // As above. 4931 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4932 return Context.getMemberPointerType(op->getType(), 4933 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4934 } else if (!isa<FunctionDecl>(dcl)) 4935 assert(0 && "Unknown/unexpected decl type"); 4936 } 4937 4938 if (lval == Expr::LV_IncompleteVoidType) { 4939 // Taking the address of a void variable is technically illegal, but we 4940 // allow it in cases which are otherwise valid. 4941 // Example: "extern void x; void* y = &x;". 4942 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4943 } 4944 4945 // If the operand has type "type", the result has type "pointer to type". 4946 return Context.getPointerType(op->getType()); 4947} 4948 4949QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4950 if (Op->isTypeDependent()) 4951 return Context.DependentTy; 4952 4953 UsualUnaryConversions(Op); 4954 QualType Ty = Op->getType(); 4955 4956 // Note that per both C89 and C99, this is always legal, even if ptype is an 4957 // incomplete type or void. It would be possible to warn about dereferencing 4958 // a void pointer, but it's completely well-defined, and such a warning is 4959 // unlikely to catch any mistakes. 4960 if (const PointerType *PT = Ty->getAs<PointerType>()) 4961 return PT->getPointeeType(); 4962 4963 if (const ObjCObjectPointerType *OPT = Ty->getAsObjCObjectPointerType()) 4964 return OPT->getPointeeType(); 4965 4966 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4967 << Ty << Op->getSourceRange(); 4968 return QualType(); 4969} 4970 4971static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4972 tok::TokenKind Kind) { 4973 BinaryOperator::Opcode Opc; 4974 switch (Kind) { 4975 default: assert(0 && "Unknown binop!"); 4976 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4977 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4978 case tok::star: Opc = BinaryOperator::Mul; break; 4979 case tok::slash: Opc = BinaryOperator::Div; break; 4980 case tok::percent: Opc = BinaryOperator::Rem; break; 4981 case tok::plus: Opc = BinaryOperator::Add; break; 4982 case tok::minus: Opc = BinaryOperator::Sub; break; 4983 case tok::lessless: Opc = BinaryOperator::Shl; break; 4984 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4985 case tok::lessequal: Opc = BinaryOperator::LE; break; 4986 case tok::less: Opc = BinaryOperator::LT; break; 4987 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4988 case tok::greater: Opc = BinaryOperator::GT; break; 4989 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4990 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4991 case tok::amp: Opc = BinaryOperator::And; break; 4992 case tok::caret: Opc = BinaryOperator::Xor; break; 4993 case tok::pipe: Opc = BinaryOperator::Or; break; 4994 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4995 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4996 case tok::equal: Opc = BinaryOperator::Assign; break; 4997 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4998 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4999 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5000 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5001 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5002 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5003 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5004 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5005 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5006 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5007 case tok::comma: Opc = BinaryOperator::Comma; break; 5008 } 5009 return Opc; 5010} 5011 5012static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5013 tok::TokenKind Kind) { 5014 UnaryOperator::Opcode Opc; 5015 switch (Kind) { 5016 default: assert(0 && "Unknown unary op!"); 5017 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5018 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5019 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5020 case tok::star: Opc = UnaryOperator::Deref; break; 5021 case tok::plus: Opc = UnaryOperator::Plus; break; 5022 case tok::minus: Opc = UnaryOperator::Minus; break; 5023 case tok::tilde: Opc = UnaryOperator::Not; break; 5024 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5025 case tok::kw___real: Opc = UnaryOperator::Real; break; 5026 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5027 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5028 } 5029 return Opc; 5030} 5031 5032/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5033/// operator @p Opc at location @c TokLoc. This routine only supports 5034/// built-in operations; ActOnBinOp handles overloaded operators. 5035Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5036 unsigned Op, 5037 Expr *lhs, Expr *rhs) { 5038 QualType ResultTy; // Result type of the binary operator. 5039 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5040 // The following two variables are used for compound assignment operators 5041 QualType CompLHSTy; // Type of LHS after promotions for computation 5042 QualType CompResultTy; // Type of computation result 5043 5044 switch (Opc) { 5045 case BinaryOperator::Assign: 5046 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5047 break; 5048 case BinaryOperator::PtrMemD: 5049 case BinaryOperator::PtrMemI: 5050 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5051 Opc == BinaryOperator::PtrMemI); 5052 break; 5053 case BinaryOperator::Mul: 5054 case BinaryOperator::Div: 5055 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5056 break; 5057 case BinaryOperator::Rem: 5058 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5059 break; 5060 case BinaryOperator::Add: 5061 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5062 break; 5063 case BinaryOperator::Sub: 5064 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5065 break; 5066 case BinaryOperator::Shl: 5067 case BinaryOperator::Shr: 5068 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5069 break; 5070 case BinaryOperator::LE: 5071 case BinaryOperator::LT: 5072 case BinaryOperator::GE: 5073 case BinaryOperator::GT: 5074 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5075 break; 5076 case BinaryOperator::EQ: 5077 case BinaryOperator::NE: 5078 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5079 break; 5080 case BinaryOperator::And: 5081 case BinaryOperator::Xor: 5082 case BinaryOperator::Or: 5083 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5084 break; 5085 case BinaryOperator::LAnd: 5086 case BinaryOperator::LOr: 5087 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5088 break; 5089 case BinaryOperator::MulAssign: 5090 case BinaryOperator::DivAssign: 5091 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5092 CompLHSTy = CompResultTy; 5093 if (!CompResultTy.isNull()) 5094 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5095 break; 5096 case BinaryOperator::RemAssign: 5097 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5098 CompLHSTy = CompResultTy; 5099 if (!CompResultTy.isNull()) 5100 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5101 break; 5102 case BinaryOperator::AddAssign: 5103 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5104 if (!CompResultTy.isNull()) 5105 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5106 break; 5107 case BinaryOperator::SubAssign: 5108 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5109 if (!CompResultTy.isNull()) 5110 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5111 break; 5112 case BinaryOperator::ShlAssign: 5113 case BinaryOperator::ShrAssign: 5114 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5115 CompLHSTy = CompResultTy; 5116 if (!CompResultTy.isNull()) 5117 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5118 break; 5119 case BinaryOperator::AndAssign: 5120 case BinaryOperator::XorAssign: 5121 case BinaryOperator::OrAssign: 5122 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5123 CompLHSTy = CompResultTy; 5124 if (!CompResultTy.isNull()) 5125 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5126 break; 5127 case BinaryOperator::Comma: 5128 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5129 break; 5130 } 5131 if (ResultTy.isNull()) 5132 return ExprError(); 5133 if (CompResultTy.isNull()) 5134 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5135 else 5136 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5137 CompLHSTy, CompResultTy, 5138 OpLoc)); 5139} 5140 5141// Binary Operators. 'Tok' is the token for the operator. 5142Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5143 tok::TokenKind Kind, 5144 ExprArg LHS, ExprArg RHS) { 5145 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5146 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5147 5148 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5149 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5150 5151 if (getLangOptions().CPlusPlus && 5152 (lhs->getType()->isOverloadableType() || 5153 rhs->getType()->isOverloadableType())) { 5154 // Find all of the overloaded operators visible from this 5155 // point. We perform both an operator-name lookup from the local 5156 // scope and an argument-dependent lookup based on the types of 5157 // the arguments. 5158 FunctionSet Functions; 5159 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5160 if (OverOp != OO_None) { 5161 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5162 Functions); 5163 Expr *Args[2] = { lhs, rhs }; 5164 DeclarationName OpName 5165 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5166 ArgumentDependentLookup(OpName, Args, 2, Functions); 5167 } 5168 5169 // Build the (potentially-overloaded, potentially-dependent) 5170 // binary operation. 5171 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5172 } 5173 5174 // Build a built-in binary operation. 5175 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5176} 5177 5178Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5179 unsigned OpcIn, 5180 ExprArg InputArg) { 5181 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5182 5183 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5184 Expr *Input = (Expr *)InputArg.get(); 5185 QualType resultType; 5186 switch (Opc) { 5187 case UnaryOperator::OffsetOf: 5188 assert(false && "Invalid unary operator"); 5189 break; 5190 5191 case UnaryOperator::PreInc: 5192 case UnaryOperator::PreDec: 5193 case UnaryOperator::PostInc: 5194 case UnaryOperator::PostDec: 5195 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5196 Opc == UnaryOperator::PreInc || 5197 Opc == UnaryOperator::PostInc); 5198 break; 5199 case UnaryOperator::AddrOf: 5200 resultType = CheckAddressOfOperand(Input, OpLoc); 5201 break; 5202 case UnaryOperator::Deref: 5203 DefaultFunctionArrayConversion(Input); 5204 resultType = CheckIndirectionOperand(Input, OpLoc); 5205 break; 5206 case UnaryOperator::Plus: 5207 case UnaryOperator::Minus: 5208 UsualUnaryConversions(Input); 5209 resultType = Input->getType(); 5210 if (resultType->isDependentType()) 5211 break; 5212 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5213 break; 5214 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5215 resultType->isEnumeralType()) 5216 break; 5217 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5218 Opc == UnaryOperator::Plus && 5219 resultType->isPointerType()) 5220 break; 5221 5222 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5223 << resultType << Input->getSourceRange()); 5224 case UnaryOperator::Not: // bitwise complement 5225 UsualUnaryConversions(Input); 5226 resultType = Input->getType(); 5227 if (resultType->isDependentType()) 5228 break; 5229 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5230 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5231 // C99 does not support '~' for complex conjugation. 5232 Diag(OpLoc, diag::ext_integer_complement_complex) 5233 << resultType << Input->getSourceRange(); 5234 else if (!resultType->isIntegerType()) 5235 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5236 << resultType << Input->getSourceRange()); 5237 break; 5238 case UnaryOperator::LNot: // logical negation 5239 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5240 DefaultFunctionArrayConversion(Input); 5241 resultType = Input->getType(); 5242 if (resultType->isDependentType()) 5243 break; 5244 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5245 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5246 << resultType << Input->getSourceRange()); 5247 // LNot always has type int. C99 6.5.3.3p5. 5248 // In C++, it's bool. C++ 5.3.1p8 5249 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5250 break; 5251 case UnaryOperator::Real: 5252 case UnaryOperator::Imag: 5253 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5254 break; 5255 case UnaryOperator::Extension: 5256 resultType = Input->getType(); 5257 break; 5258 } 5259 if (resultType.isNull()) 5260 return ExprError(); 5261 5262 InputArg.release(); 5263 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5264} 5265 5266// Unary Operators. 'Tok' is the token for the operator. 5267Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5268 tok::TokenKind Op, ExprArg input) { 5269 Expr *Input = (Expr*)input.get(); 5270 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5271 5272 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5273 // Find all of the overloaded operators visible from this 5274 // point. We perform both an operator-name lookup from the local 5275 // scope and an argument-dependent lookup based on the types of 5276 // the arguments. 5277 FunctionSet Functions; 5278 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5279 if (OverOp != OO_None) { 5280 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5281 Functions); 5282 DeclarationName OpName 5283 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5284 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5285 } 5286 5287 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5288 } 5289 5290 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5291} 5292 5293/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5294Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5295 SourceLocation LabLoc, 5296 IdentifierInfo *LabelII) { 5297 // Look up the record for this label identifier. 5298 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5299 5300 // If we haven't seen this label yet, create a forward reference. It 5301 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5302 if (LabelDecl == 0) 5303 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5304 5305 // Create the AST node. The address of a label always has type 'void*'. 5306 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5307 Context.getPointerType(Context.VoidTy))); 5308} 5309 5310Sema::OwningExprResult 5311Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5312 SourceLocation RPLoc) { // "({..})" 5313 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5314 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5315 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5316 5317 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5318 if (isFileScope) 5319 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5320 5321 // FIXME: there are a variety of strange constraints to enforce here, for 5322 // example, it is not possible to goto into a stmt expression apparently. 5323 // More semantic analysis is needed. 5324 5325 // If there are sub stmts in the compound stmt, take the type of the last one 5326 // as the type of the stmtexpr. 5327 QualType Ty = Context.VoidTy; 5328 5329 if (!Compound->body_empty()) { 5330 Stmt *LastStmt = Compound->body_back(); 5331 // If LastStmt is a label, skip down through into the body. 5332 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5333 LastStmt = Label->getSubStmt(); 5334 5335 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5336 Ty = LastExpr->getType(); 5337 } 5338 5339 // FIXME: Check that expression type is complete/non-abstract; statement 5340 // expressions are not lvalues. 5341 5342 substmt.release(); 5343 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5344} 5345 5346Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5347 SourceLocation BuiltinLoc, 5348 SourceLocation TypeLoc, 5349 TypeTy *argty, 5350 OffsetOfComponent *CompPtr, 5351 unsigned NumComponents, 5352 SourceLocation RPLoc) { 5353 // FIXME: This function leaks all expressions in the offset components on 5354 // error. 5355 // FIXME: Preserve type source info. 5356 QualType ArgTy = GetTypeFromParser(argty); 5357 assert(!ArgTy.isNull() && "Missing type argument!"); 5358 5359 bool Dependent = ArgTy->isDependentType(); 5360 5361 // We must have at least one component that refers to the type, and the first 5362 // one is known to be a field designator. Verify that the ArgTy represents 5363 // a struct/union/class. 5364 if (!Dependent && !ArgTy->isRecordType()) 5365 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5366 5367 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5368 // with an incomplete type would be illegal. 5369 5370 // Otherwise, create a null pointer as the base, and iteratively process 5371 // the offsetof designators. 5372 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5373 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5374 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5375 ArgTy, SourceLocation()); 5376 5377 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5378 // GCC extension, diagnose them. 5379 // FIXME: This diagnostic isn't actually visible because the location is in 5380 // a system header! 5381 if (NumComponents != 1) 5382 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5383 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5384 5385 if (!Dependent) { 5386 bool DidWarnAboutNonPOD = false; 5387 5388 // FIXME: Dependent case loses a lot of information here. And probably 5389 // leaks like a sieve. 5390 for (unsigned i = 0; i != NumComponents; ++i) { 5391 const OffsetOfComponent &OC = CompPtr[i]; 5392 if (OC.isBrackets) { 5393 // Offset of an array sub-field. TODO: Should we allow vector elements? 5394 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5395 if (!AT) { 5396 Res->Destroy(Context); 5397 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5398 << Res->getType()); 5399 } 5400 5401 // FIXME: C++: Verify that operator[] isn't overloaded. 5402 5403 // Promote the array so it looks more like a normal array subscript 5404 // expression. 5405 DefaultFunctionArrayConversion(Res); 5406 5407 // C99 6.5.2.1p1 5408 Expr *Idx = static_cast<Expr*>(OC.U.E); 5409 // FIXME: Leaks Res 5410 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5411 return ExprError(Diag(Idx->getLocStart(), 5412 diag::err_typecheck_subscript_not_integer) 5413 << Idx->getSourceRange()); 5414 5415 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5416 OC.LocEnd); 5417 continue; 5418 } 5419 5420 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5421 if (!RC) { 5422 Res->Destroy(Context); 5423 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5424 << Res->getType()); 5425 } 5426 5427 // Get the decl corresponding to this. 5428 RecordDecl *RD = RC->getDecl(); 5429 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5430 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5431 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5432 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5433 << Res->getType()); 5434 DidWarnAboutNonPOD = true; 5435 } 5436 } 5437 5438 FieldDecl *MemberDecl 5439 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5440 LookupMemberName) 5441 .getAsDecl()); 5442 // FIXME: Leaks Res 5443 if (!MemberDecl) 5444 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5445 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5446 5447 // FIXME: C++: Verify that MemberDecl isn't a static field. 5448 // FIXME: Verify that MemberDecl isn't a bitfield. 5449 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5450 Res = BuildAnonymousStructUnionMemberReference( 5451 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5452 } else { 5453 // MemberDecl->getType() doesn't get the right qualifiers, but it 5454 // doesn't matter here. 5455 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5456 MemberDecl->getType().getNonReferenceType()); 5457 } 5458 } 5459 } 5460 5461 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5462 Context.getSizeType(), BuiltinLoc)); 5463} 5464 5465 5466Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5467 TypeTy *arg1,TypeTy *arg2, 5468 SourceLocation RPLoc) { 5469 // FIXME: Preserve type source info. 5470 QualType argT1 = GetTypeFromParser(arg1); 5471 QualType argT2 = GetTypeFromParser(arg2); 5472 5473 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5474 5475 if (getLangOptions().CPlusPlus) { 5476 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5477 << SourceRange(BuiltinLoc, RPLoc); 5478 return ExprError(); 5479 } 5480 5481 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5482 argT1, argT2, RPLoc)); 5483} 5484 5485Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5486 ExprArg cond, 5487 ExprArg expr1, ExprArg expr2, 5488 SourceLocation RPLoc) { 5489 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5490 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5491 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5492 5493 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5494 5495 QualType resType; 5496 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5497 resType = Context.DependentTy; 5498 } else { 5499 // The conditional expression is required to be a constant expression. 5500 llvm::APSInt condEval(32); 5501 SourceLocation ExpLoc; 5502 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5503 return ExprError(Diag(ExpLoc, 5504 diag::err_typecheck_choose_expr_requires_constant) 5505 << CondExpr->getSourceRange()); 5506 5507 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5508 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5509 } 5510 5511 cond.release(); expr1.release(); expr2.release(); 5512 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5513 resType, RPLoc)); 5514} 5515 5516//===----------------------------------------------------------------------===// 5517// Clang Extensions. 5518//===----------------------------------------------------------------------===// 5519 5520/// ActOnBlockStart - This callback is invoked when a block literal is started. 5521void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5522 // Analyze block parameters. 5523 BlockSemaInfo *BSI = new BlockSemaInfo(); 5524 5525 // Add BSI to CurBlock. 5526 BSI->PrevBlockInfo = CurBlock; 5527 CurBlock = BSI; 5528 5529 BSI->ReturnType = QualType(); 5530 BSI->TheScope = BlockScope; 5531 BSI->hasBlockDeclRefExprs = false; 5532 BSI->hasPrototype = false; 5533 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5534 CurFunctionNeedsScopeChecking = false; 5535 5536 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5537 PushDeclContext(BlockScope, BSI->TheDecl); 5538} 5539 5540void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5541 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5542 5543 if (ParamInfo.getNumTypeObjects() == 0 5544 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5545 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5546 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5547 5548 if (T->isArrayType()) { 5549 Diag(ParamInfo.getSourceRange().getBegin(), 5550 diag::err_block_returns_array); 5551 return; 5552 } 5553 5554 // The parameter list is optional, if there was none, assume (). 5555 if (!T->isFunctionType()) 5556 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5557 5558 CurBlock->hasPrototype = true; 5559 CurBlock->isVariadic = false; 5560 // Check for a valid sentinel attribute on this block. 5561 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5562 Diag(ParamInfo.getAttributes()->getLoc(), 5563 diag::warn_attribute_sentinel_not_variadic) << 1; 5564 // FIXME: remove the attribute. 5565 } 5566 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5567 5568 // Do not allow returning a objc interface by-value. 5569 if (RetTy->isObjCInterfaceType()) { 5570 Diag(ParamInfo.getSourceRange().getBegin(), 5571 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5572 return; 5573 } 5574 return; 5575 } 5576 5577 // Analyze arguments to block. 5578 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5579 "Not a function declarator!"); 5580 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5581 5582 CurBlock->hasPrototype = FTI.hasPrototype; 5583 CurBlock->isVariadic = true; 5584 5585 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5586 // no arguments, not a function that takes a single void argument. 5587 if (FTI.hasPrototype && 5588 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5589 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5590 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5591 // empty arg list, don't push any params. 5592 CurBlock->isVariadic = false; 5593 } else if (FTI.hasPrototype) { 5594 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5595 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5596 CurBlock->isVariadic = FTI.isVariadic; 5597 } 5598 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5599 CurBlock->Params.size()); 5600 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5601 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5602 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5603 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5604 // If this has an identifier, add it to the scope stack. 5605 if ((*AI)->getIdentifier()) 5606 PushOnScopeChains(*AI, CurBlock->TheScope); 5607 5608 // Check for a valid sentinel attribute on this block. 5609 if (!CurBlock->isVariadic && 5610 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5611 Diag(ParamInfo.getAttributes()->getLoc(), 5612 diag::warn_attribute_sentinel_not_variadic) << 1; 5613 // FIXME: remove the attribute. 5614 } 5615 5616 // Analyze the return type. 5617 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5618 QualType RetTy = T->getAsFunctionType()->getResultType(); 5619 5620 // Do not allow returning a objc interface by-value. 5621 if (RetTy->isObjCInterfaceType()) { 5622 Diag(ParamInfo.getSourceRange().getBegin(), 5623 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5624 } else if (!RetTy->isDependentType()) 5625 CurBlock->ReturnType = RetTy; 5626} 5627 5628/// ActOnBlockError - If there is an error parsing a block, this callback 5629/// is invoked to pop the information about the block from the action impl. 5630void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5631 // Ensure that CurBlock is deleted. 5632 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5633 5634 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5635 5636 // Pop off CurBlock, handle nested blocks. 5637 PopDeclContext(); 5638 CurBlock = CurBlock->PrevBlockInfo; 5639 // FIXME: Delete the ParmVarDecl objects as well??? 5640} 5641 5642/// ActOnBlockStmtExpr - This is called when the body of a block statement 5643/// literal was successfully completed. ^(int x){...} 5644Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5645 StmtArg body, Scope *CurScope) { 5646 // If blocks are disabled, emit an error. 5647 if (!LangOpts.Blocks) 5648 Diag(CaretLoc, diag::err_blocks_disable); 5649 5650 // Ensure that CurBlock is deleted. 5651 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5652 5653 PopDeclContext(); 5654 5655 // Pop off CurBlock, handle nested blocks. 5656 CurBlock = CurBlock->PrevBlockInfo; 5657 5658 QualType RetTy = Context.VoidTy; 5659 if (!BSI->ReturnType.isNull()) 5660 RetTy = BSI->ReturnType; 5661 5662 llvm::SmallVector<QualType, 8> ArgTypes; 5663 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5664 ArgTypes.push_back(BSI->Params[i]->getType()); 5665 5666 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5667 QualType BlockTy; 5668 if (!BSI->hasPrototype) 5669 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5670 NoReturn); 5671 else 5672 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5673 BSI->isVariadic, 0, false, false, 0, 0, 5674 NoReturn); 5675 5676 // FIXME: Check that return/parameter types are complete/non-abstract 5677 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5678 BlockTy = Context.getBlockPointerType(BlockTy); 5679 5680 // If needed, diagnose invalid gotos and switches in the block. 5681 if (CurFunctionNeedsScopeChecking) 5682 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5683 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5684 5685 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5686 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5687 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5688 BSI->hasBlockDeclRefExprs)); 5689} 5690 5691Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5692 ExprArg expr, TypeTy *type, 5693 SourceLocation RPLoc) { 5694 QualType T = GetTypeFromParser(type); 5695 Expr *E = static_cast<Expr*>(expr.get()); 5696 Expr *OrigExpr = E; 5697 5698 InitBuiltinVaListType(); 5699 5700 // Get the va_list type 5701 QualType VaListType = Context.getBuiltinVaListType(); 5702 if (VaListType->isArrayType()) { 5703 // Deal with implicit array decay; for example, on x86-64, 5704 // va_list is an array, but it's supposed to decay to 5705 // a pointer for va_arg. 5706 VaListType = Context.getArrayDecayedType(VaListType); 5707 // Make sure the input expression also decays appropriately. 5708 UsualUnaryConversions(E); 5709 } else { 5710 // Otherwise, the va_list argument must be an l-value because 5711 // it is modified by va_arg. 5712 if (!E->isTypeDependent() && 5713 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5714 return ExprError(); 5715 } 5716 5717 if (!E->isTypeDependent() && 5718 !Context.hasSameType(VaListType, E->getType())) { 5719 return ExprError(Diag(E->getLocStart(), 5720 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5721 << OrigExpr->getType() << E->getSourceRange()); 5722 } 5723 5724 // FIXME: Check that type is complete/non-abstract 5725 // FIXME: Warn if a non-POD type is passed in. 5726 5727 expr.release(); 5728 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5729 RPLoc)); 5730} 5731 5732Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5733 // The type of __null will be int or long, depending on the size of 5734 // pointers on the target. 5735 QualType Ty; 5736 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5737 Ty = Context.IntTy; 5738 else 5739 Ty = Context.LongTy; 5740 5741 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5742} 5743 5744bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5745 SourceLocation Loc, 5746 QualType DstType, QualType SrcType, 5747 Expr *SrcExpr, const char *Flavor) { 5748 // Decode the result (notice that AST's are still created for extensions). 5749 bool isInvalid = false; 5750 unsigned DiagKind; 5751 switch (ConvTy) { 5752 default: assert(0 && "Unknown conversion type"); 5753 case Compatible: return false; 5754 case PointerToInt: 5755 DiagKind = diag::ext_typecheck_convert_pointer_int; 5756 break; 5757 case IntToPointer: 5758 DiagKind = diag::ext_typecheck_convert_int_pointer; 5759 break; 5760 case IncompatiblePointer: 5761 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5762 break; 5763 case IncompatiblePointerSign: 5764 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5765 break; 5766 case FunctionVoidPointer: 5767 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5768 break; 5769 case CompatiblePointerDiscardsQualifiers: 5770 // If the qualifiers lost were because we were applying the 5771 // (deprecated) C++ conversion from a string literal to a char* 5772 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5773 // Ideally, this check would be performed in 5774 // CheckPointerTypesForAssignment. However, that would require a 5775 // bit of refactoring (so that the second argument is an 5776 // expression, rather than a type), which should be done as part 5777 // of a larger effort to fix CheckPointerTypesForAssignment for 5778 // C++ semantics. 5779 if (getLangOptions().CPlusPlus && 5780 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5781 return false; 5782 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5783 break; 5784 case IntToBlockPointer: 5785 DiagKind = diag::err_int_to_block_pointer; 5786 break; 5787 case IncompatibleBlockPointer: 5788 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5789 break; 5790 case IncompatibleObjCQualifiedId: 5791 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5792 // it can give a more specific diagnostic. 5793 DiagKind = diag::warn_incompatible_qualified_id; 5794 break; 5795 case IncompatibleVectors: 5796 DiagKind = diag::warn_incompatible_vectors; 5797 break; 5798 case Incompatible: 5799 DiagKind = diag::err_typecheck_convert_incompatible; 5800 isInvalid = true; 5801 break; 5802 } 5803 5804 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5805 << SrcExpr->getSourceRange(); 5806 return isInvalid; 5807} 5808 5809bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5810 llvm::APSInt ICEResult; 5811 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5812 if (Result) 5813 *Result = ICEResult; 5814 return false; 5815 } 5816 5817 Expr::EvalResult EvalResult; 5818 5819 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5820 EvalResult.HasSideEffects) { 5821 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5822 5823 if (EvalResult.Diag) { 5824 // We only show the note if it's not the usual "invalid subexpression" 5825 // or if it's actually in a subexpression. 5826 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5827 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5828 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5829 } 5830 5831 return true; 5832 } 5833 5834 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5835 E->getSourceRange(); 5836 5837 if (EvalResult.Diag && 5838 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5839 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5840 5841 if (Result) 5842 *Result = EvalResult.Val.getInt(); 5843 return false; 5844} 5845 5846Sema::ExpressionEvaluationContext 5847Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5848 // Introduce a new set of potentially referenced declarations to the stack. 5849 if (NewContext == PotentiallyPotentiallyEvaluated) 5850 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5851 5852 std::swap(ExprEvalContext, NewContext); 5853 return NewContext; 5854} 5855 5856void 5857Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5858 ExpressionEvaluationContext NewContext) { 5859 ExprEvalContext = NewContext; 5860 5861 if (OldContext == PotentiallyPotentiallyEvaluated) { 5862 // Mark any remaining declarations in the current position of the stack 5863 // as "referenced". If they were not meant to be referenced, semantic 5864 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5865 PotentiallyReferencedDecls RemainingDecls; 5866 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5867 PotentiallyReferencedDeclStack.pop_back(); 5868 5869 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5870 IEnd = RemainingDecls.end(); 5871 I != IEnd; ++I) 5872 MarkDeclarationReferenced(I->first, I->second); 5873 } 5874} 5875 5876/// \brief Note that the given declaration was referenced in the source code. 5877/// 5878/// This routine should be invoke whenever a given declaration is referenced 5879/// in the source code, and where that reference occurred. If this declaration 5880/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5881/// C99 6.9p3), then the declaration will be marked as used. 5882/// 5883/// \param Loc the location where the declaration was referenced. 5884/// 5885/// \param D the declaration that has been referenced by the source code. 5886void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5887 assert(D && "No declaration?"); 5888 5889 if (D->isUsed()) 5890 return; 5891 5892 // Mark a parameter declaration "used", regardless of whether we're in a 5893 // template or not. 5894 if (isa<ParmVarDecl>(D)) 5895 D->setUsed(true); 5896 5897 // Do not mark anything as "used" within a dependent context; wait for 5898 // an instantiation. 5899 if (CurContext->isDependentContext()) 5900 return; 5901 5902 switch (ExprEvalContext) { 5903 case Unevaluated: 5904 // We are in an expression that is not potentially evaluated; do nothing. 5905 return; 5906 5907 case PotentiallyEvaluated: 5908 // We are in a potentially-evaluated expression, so this declaration is 5909 // "used"; handle this below. 5910 break; 5911 5912 case PotentiallyPotentiallyEvaluated: 5913 // We are in an expression that may be potentially evaluated; queue this 5914 // declaration reference until we know whether the expression is 5915 // potentially evaluated. 5916 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5917 return; 5918 } 5919 5920 // Note that this declaration has been used. 5921 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5922 unsigned TypeQuals; 5923 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5924 if (!Constructor->isUsed()) 5925 DefineImplicitDefaultConstructor(Loc, Constructor); 5926 } else if (Constructor->isImplicit() && 5927 Constructor->isCopyConstructor(Context, TypeQuals)) { 5928 if (!Constructor->isUsed()) 5929 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5930 } 5931 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 5932 if (Destructor->isImplicit() && !Destructor->isUsed()) 5933 DefineImplicitDestructor(Loc, Destructor); 5934 5935 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 5936 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 5937 MethodDecl->getOverloadedOperator() == OO_Equal) { 5938 if (!MethodDecl->isUsed()) 5939 DefineImplicitOverloadedAssign(Loc, MethodDecl); 5940 } 5941 } 5942 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5943 // Implicit instantiation of function templates and member functions of 5944 // class templates. 5945 if (!Function->getBody()) { 5946 // FIXME: distinguish between implicit instantiations of function 5947 // templates and explicit specializations (the latter don't get 5948 // instantiated, naturally). 5949 if (Function->getInstantiatedFromMemberFunction() || 5950 Function->getPrimaryTemplate()) 5951 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 5952 } 5953 5954 5955 // FIXME: keep track of references to static functions 5956 Function->setUsed(true); 5957 return; 5958 } 5959 5960 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5961 // Implicit instantiation of static data members of class templates. 5962 // FIXME: distinguish between implicit instantiations (which we need to 5963 // actually instantiate) and explicit specializations. 5964 if (Var->isStaticDataMember() && 5965 Var->getInstantiatedFromStaticDataMember()) 5966 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 5967 5968 // FIXME: keep track of references to static data? 5969 5970 D->setUsed(true); 5971 return; 5972} 5973} 5974 5975