SemaExpr.cpp revision 73c39abdbb79927605d740c93dd9629e3e4f9bfe
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/DeclTemplate.h" 18#include "clang/AST/ExprCXX.h" 19#include "clang/AST/ExprObjC.h" 20#include "clang/Basic/PartialDiagnostic.h" 21#include "clang/Basic/SourceManager.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Lex/LiteralSupport.h" 24#include "clang/Lex/Preprocessor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Designator.h" 27#include "clang/Parse/Scope.h" 28using namespace clang; 29 30 31/// \brief Determine whether the use of this declaration is valid, and 32/// emit any corresponding diagnostics. 33/// 34/// This routine diagnoses various problems with referencing 35/// declarations that can occur when using a declaration. For example, 36/// it might warn if a deprecated or unavailable declaration is being 37/// used, or produce an error (and return true) if a C++0x deleted 38/// function is being used. 39/// 40/// \returns true if there was an error (this declaration cannot be 41/// referenced), false otherwise. 42bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 43 // See if the decl is deprecated. 44 if (D->getAttr<DeprecatedAttr>()) { 45 // Implementing deprecated stuff requires referencing deprecated 46 // stuff. Don't warn if we are implementing a deprecated 47 // construct. 48 bool isSilenced = false; 49 50 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 51 // If this reference happens *in* a deprecated function or method, don't 52 // warn. 53 isSilenced = ND->getAttr<DeprecatedAttr>(); 54 55 // If this is an Objective-C method implementation, check to see if the 56 // method was deprecated on the declaration, not the definition. 57 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 58 // The semantic decl context of a ObjCMethodDecl is the 59 // ObjCImplementationDecl. 60 if (ObjCImplementationDecl *Impl 61 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 62 63 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 64 MD->isInstanceMethod()); 65 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 66 } 67 } 68 } 69 70 if (!isSilenced) 71 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 72 } 73 74 // See if this is a deleted function. 75 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 76 if (FD->isDeleted()) { 77 Diag(Loc, diag::err_deleted_function_use); 78 Diag(D->getLocation(), diag::note_unavailable_here) << true; 79 return true; 80 } 81 } 82 83 // See if the decl is unavailable 84 if (D->getAttr<UnavailableAttr>()) { 85 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 86 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 87 } 88 89 return false; 90} 91 92/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 93/// (and other functions in future), which have been declared with sentinel 94/// attribute. It warns if call does not have the sentinel argument. 95/// 96void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 97 Expr **Args, unsigned NumArgs) { 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()->getAs<FunctionType>() 136 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>(); 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 Expr::NPC_ValueDependentIsNull))) { 178 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 179 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 180 } 181 return; 182} 183 184SourceRange Sema::getExprRange(ExprTy *E) const { 185 Expr *Ex = (Expr *)E; 186 return Ex? Ex->getSourceRange() : SourceRange(); 187} 188 189//===----------------------------------------------------------------------===// 190// Standard Promotions and Conversions 191//===----------------------------------------------------------------------===// 192 193/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 194void Sema::DefaultFunctionArrayConversion(Expr *&E) { 195 QualType Ty = E->getType(); 196 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 197 198 if (Ty->isFunctionType()) 199 ImpCastExprToType(E, Context.getPointerType(Ty), 200 CastExpr::CK_FunctionToPointerDecay); 201 else if (Ty->isArrayType()) { 202 // In C90 mode, arrays only promote to pointers if the array expression is 203 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 204 // type 'array of type' is converted to an expression that has type 'pointer 205 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 206 // that has type 'array of type' ...". The relevant change is "an lvalue" 207 // (C90) to "an expression" (C99). 208 // 209 // C++ 4.2p1: 210 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 211 // T" can be converted to an rvalue of type "pointer to T". 212 // 213 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 214 E->isLvalue(Context) == Expr::LV_Valid) 215 ImpCastExprToType(E, Context.getArrayDecayedType(Ty), 216 CastExpr::CK_ArrayToPointerDecay); 217 } 218} 219 220/// UsualUnaryConversions - Performs various conversions that are common to most 221/// operators (C99 6.3). The conversions of array and function types are 222/// sometimes surpressed. For example, the array->pointer conversion doesn't 223/// apply if the array is an argument to the sizeof or address (&) operators. 224/// In these instances, this routine should *not* be called. 225Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 226 QualType Ty = Expr->getType(); 227 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 228 229 // C99 6.3.1.1p2: 230 // 231 // The following may be used in an expression wherever an int or 232 // unsigned int may be used: 233 // - an object or expression with an integer type whose integer 234 // conversion rank is less than or equal to the rank of int 235 // and unsigned int. 236 // - A bit-field of type _Bool, int, signed int, or unsigned int. 237 // 238 // If an int can represent all values of the original type, the 239 // value is converted to an int; otherwise, it is converted to an 240 // unsigned int. These are called the integer promotions. All 241 // other types are unchanged by the integer promotions. 242 QualType PTy = Context.isPromotableBitField(Expr); 243 if (!PTy.isNull()) { 244 ImpCastExprToType(Expr, PTy, CastExpr::CK_IntegralCast); 245 return Expr; 246 } 247 if (Ty->isPromotableIntegerType()) { 248 QualType PT = Context.getPromotedIntegerType(Ty); 249 ImpCastExprToType(Expr, PT, CastExpr::CK_IntegralCast); 250 return Expr; 251 } 252 253 DefaultFunctionArrayConversion(Expr); 254 return Expr; 255} 256 257/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 258/// do not have a prototype. Arguments that have type float are promoted to 259/// double. All other argument types are converted by UsualUnaryConversions(). 260void Sema::DefaultArgumentPromotion(Expr *&Expr) { 261 QualType Ty = Expr->getType(); 262 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 263 264 // If this is a 'float' (CVR qualified or typedef) promote to double. 265 if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) 266 if (BT->getKind() == BuiltinType::Float) 267 return ImpCastExprToType(Expr, Context.DoubleTy, 268 CastExpr::CK_FloatingCast); 269 270 UsualUnaryConversions(Expr); 271} 272 273/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 274/// will warn if the resulting type is not a POD type, and rejects ObjC 275/// interfaces passed by value. This returns true if the argument type is 276/// completely illegal. 277bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 278 DefaultArgumentPromotion(Expr); 279 280 if (Expr->getType()->isObjCInterfaceType()) { 281 Diag(Expr->getLocStart(), 282 diag::err_cannot_pass_objc_interface_to_vararg) 283 << Expr->getType() << CT; 284 return true; 285 } 286 287 if (!Expr->getType()->isPODType()) 288 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 289 << Expr->getType() << CT; 290 291 return false; 292} 293 294 295/// UsualArithmeticConversions - Performs various conversions that are common to 296/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 297/// routine returns the first non-arithmetic type found. The client is 298/// responsible for emitting appropriate error diagnostics. 299/// FIXME: verify the conversion rules for "complex int" are consistent with 300/// GCC. 301QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 302 bool isCompAssign) { 303 if (!isCompAssign) 304 UsualUnaryConversions(lhsExpr); 305 306 UsualUnaryConversions(rhsExpr); 307 308 // For conversion purposes, we ignore any qualifiers. 309 // For example, "const float" and "float" are equivalent. 310 QualType lhs = 311 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 312 QualType rhs = 313 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 314 315 // If both types are identical, no conversion is needed. 316 if (lhs == rhs) 317 return lhs; 318 319 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 320 // The caller can deal with this (e.g. pointer + int). 321 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 322 return lhs; 323 324 // Perform bitfield promotions. 325 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr); 326 if (!LHSBitfieldPromoteTy.isNull()) 327 lhs = LHSBitfieldPromoteTy; 328 QualType RHSBitfieldPromoteTy = Context.isPromotableBitField(rhsExpr); 329 if (!RHSBitfieldPromoteTy.isNull()) 330 rhs = RHSBitfieldPromoteTy; 331 332 QualType destType = Context.UsualArithmeticConversionsType(lhs, rhs); 333 if (!isCompAssign) 334 ImpCastExprToType(lhsExpr, destType, CastExpr::CK_Unknown); 335 ImpCastExprToType(rhsExpr, destType, CastExpr::CK_Unknown); 336 return destType; 337} 338 339//===----------------------------------------------------------------------===// 340// Semantic Analysis for various Expression Types 341//===----------------------------------------------------------------------===// 342 343 344/// ActOnStringLiteral - The specified tokens were lexed as pasted string 345/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 346/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 347/// multiple tokens. However, the common case is that StringToks points to one 348/// string. 349/// 350Action::OwningExprResult 351Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 352 assert(NumStringToks && "Must have at least one string!"); 353 354 StringLiteralParser Literal(StringToks, NumStringToks, PP); 355 if (Literal.hadError) 356 return ExprError(); 357 358 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 359 for (unsigned i = 0; i != NumStringToks; ++i) 360 StringTokLocs.push_back(StringToks[i].getLocation()); 361 362 QualType StrTy = Context.CharTy; 363 if (Literal.AnyWide) StrTy = Context.getWCharType(); 364 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 365 366 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 367 if (getLangOptions().CPlusPlus) 368 StrTy.addConst(); 369 370 // Get an array type for the string, according to C99 6.4.5. This includes 371 // the nul terminator character as well as the string length for pascal 372 // strings. 373 StrTy = Context.getConstantArrayType(StrTy, 374 llvm::APInt(32, Literal.GetNumStringChars()+1), 375 ArrayType::Normal, 0); 376 377 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 378 return Owned(StringLiteral::Create(Context, Literal.GetString(), 379 Literal.GetStringLength(), 380 Literal.AnyWide, StrTy, 381 &StringTokLocs[0], 382 StringTokLocs.size())); 383} 384 385/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 386/// CurBlock to VD should cause it to be snapshotted (as we do for auto 387/// variables defined outside the block) or false if this is not needed (e.g. 388/// for values inside the block or for globals). 389/// 390/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 391/// up-to-date. 392/// 393static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 394 ValueDecl *VD) { 395 // If the value is defined inside the block, we couldn't snapshot it even if 396 // we wanted to. 397 if (CurBlock->TheDecl == VD->getDeclContext()) 398 return false; 399 400 // If this is an enum constant or function, it is constant, don't snapshot. 401 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 402 return false; 403 404 // If this is a reference to an extern, static, or global variable, no need to 405 // snapshot it. 406 // FIXME: What about 'const' variables in C++? 407 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 408 if (!Var->hasLocalStorage()) 409 return false; 410 411 // Blocks that have these can't be constant. 412 CurBlock->hasBlockDeclRefExprs = true; 413 414 // If we have nested blocks, the decl may be declared in an outer block (in 415 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 416 // be defined outside all of the current blocks (in which case the blocks do 417 // all get the bit). Walk the nesting chain. 418 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 419 NextBlock = NextBlock->PrevBlockInfo) { 420 // If we found the defining block for the variable, don't mark the block as 421 // having a reference outside it. 422 if (NextBlock->TheDecl == VD->getDeclContext()) 423 break; 424 425 // Otherwise, the DeclRef from the inner block causes the outer one to need 426 // a snapshot as well. 427 NextBlock->hasBlockDeclRefExprs = true; 428 } 429 430 return true; 431} 432 433 434 435/// ActOnIdentifierExpr - The parser read an identifier in expression context, 436/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 437/// identifier is used in a function call context. 438/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 439/// class or namespace that the identifier must be a member of. 440Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 441 IdentifierInfo &II, 442 bool HasTrailingLParen, 443 const CXXScopeSpec *SS, 444 bool isAddressOfOperand) { 445 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 446 isAddressOfOperand); 447} 448 449/// BuildDeclRefExpr - Build either a DeclRefExpr or a 450/// QualifiedDeclRefExpr based on whether or not SS is a 451/// nested-name-specifier. 452Sema::OwningExprResult 453Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 454 bool TypeDependent, bool ValueDependent, 455 const CXXScopeSpec *SS) { 456 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 457 Diag(Loc, 458 diag::err_auto_variable_cannot_appear_in_own_initializer) 459 << D->getDeclName(); 460 return ExprError(); 461 } 462 463 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 464 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 465 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 466 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 467 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 468 << D->getIdentifier() << FD->getDeclName(); 469 Diag(D->getLocation(), diag::note_local_variable_declared_here) 470 << D->getIdentifier(); 471 return ExprError(); 472 } 473 } 474 } 475 } 476 477 MarkDeclarationReferenced(Loc, D); 478 479 Expr *E; 480 if (SS && !SS->isEmpty()) { 481 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 482 ValueDependent, SS->getRange(), 483 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 484 } else 485 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 486 487 return Owned(E); 488} 489 490/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 491/// variable corresponding to the anonymous union or struct whose type 492/// is Record. 493static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 494 RecordDecl *Record) { 495 assert(Record->isAnonymousStructOrUnion() && 496 "Record must be an anonymous struct or union!"); 497 498 // FIXME: Once Decls are directly linked together, this will be an O(1) 499 // operation rather than a slow walk through DeclContext's vector (which 500 // itself will be eliminated). DeclGroups might make this even better. 501 DeclContext *Ctx = Record->getDeclContext(); 502 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 503 DEnd = Ctx->decls_end(); 504 D != DEnd; ++D) { 505 if (*D == Record) { 506 // The object for the anonymous struct/union directly 507 // follows its type in the list of declarations. 508 ++D; 509 assert(D != DEnd && "Missing object for anonymous record"); 510 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 511 return *D; 512 } 513 } 514 515 assert(false && "Missing object for anonymous record"); 516 return 0; 517} 518 519/// \brief Given a field that represents a member of an anonymous 520/// struct/union, build the path from that field's context to the 521/// actual member. 522/// 523/// Construct the sequence of field member references we'll have to 524/// perform to get to the field in the anonymous union/struct. The 525/// list of members is built from the field outward, so traverse it 526/// backwards to go from an object in the current context to the field 527/// we found. 528/// 529/// \returns The variable from which the field access should begin, 530/// for an anonymous struct/union that is not a member of another 531/// class. Otherwise, returns NULL. 532VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 533 llvm::SmallVectorImpl<FieldDecl *> &Path) { 534 assert(Field->getDeclContext()->isRecord() && 535 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 536 && "Field must be stored inside an anonymous struct or union"); 537 538 Path.push_back(Field); 539 VarDecl *BaseObject = 0; 540 DeclContext *Ctx = Field->getDeclContext(); 541 do { 542 RecordDecl *Record = cast<RecordDecl>(Ctx); 543 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 544 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 545 Path.push_back(AnonField); 546 else { 547 BaseObject = cast<VarDecl>(AnonObject); 548 break; 549 } 550 Ctx = Ctx->getParent(); 551 } while (Ctx->isRecord() && 552 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 553 554 return BaseObject; 555} 556 557Sema::OwningExprResult 558Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 559 FieldDecl *Field, 560 Expr *BaseObjectExpr, 561 SourceLocation OpLoc) { 562 llvm::SmallVector<FieldDecl *, 4> AnonFields; 563 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 564 AnonFields); 565 566 // Build the expression that refers to the base object, from 567 // which we will build a sequence of member references to each 568 // of the anonymous union objects and, eventually, the field we 569 // found via name lookup. 570 bool BaseObjectIsPointer = false; 571 Qualifiers BaseQuals; 572 if (BaseObject) { 573 // BaseObject is an anonymous struct/union variable (and is, 574 // therefore, not part of another non-anonymous record). 575 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 576 MarkDeclarationReferenced(Loc, BaseObject); 577 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 578 SourceLocation()); 579 BaseQuals 580 = Context.getCanonicalType(BaseObject->getType()).getQualifiers(); 581 } else if (BaseObjectExpr) { 582 // The caller provided the base object expression. Determine 583 // whether its a pointer and whether it adds any qualifiers to the 584 // anonymous struct/union fields we're looking into. 585 QualType ObjectType = BaseObjectExpr->getType(); 586 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) { 587 BaseObjectIsPointer = true; 588 ObjectType = ObjectPtr->getPointeeType(); 589 } 590 BaseQuals 591 = Context.getCanonicalType(ObjectType).getQualifiers(); 592 } else { 593 // We've found a member of an anonymous struct/union that is 594 // inside a non-anonymous struct/union, so in a well-formed 595 // program our base object expression is "this". 596 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 597 if (!MD->isStatic()) { 598 QualType AnonFieldType 599 = Context.getTagDeclType( 600 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 601 QualType ThisType = Context.getTagDeclType(MD->getParent()); 602 if ((Context.getCanonicalType(AnonFieldType) 603 == Context.getCanonicalType(ThisType)) || 604 IsDerivedFrom(ThisType, AnonFieldType)) { 605 // Our base object expression is "this". 606 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 607 MD->getThisType(Context)); 608 BaseObjectIsPointer = true; 609 } 610 } else { 611 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 612 << Field->getDeclName()); 613 } 614 BaseQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 615 } 616 617 if (!BaseObjectExpr) 618 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 619 << Field->getDeclName()); 620 } 621 622 // Build the implicit member references to the field of the 623 // anonymous struct/union. 624 Expr *Result = BaseObjectExpr; 625 Qualifiers ResultQuals = BaseQuals; 626 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 627 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 628 FI != FIEnd; ++FI) { 629 QualType MemberType = (*FI)->getType(); 630 Qualifiers MemberTypeQuals = 631 Context.getCanonicalType(MemberType).getQualifiers(); 632 633 // CVR attributes from the base are picked up by members, 634 // except that 'mutable' members don't pick up 'const'. 635 if ((*FI)->isMutable()) 636 ResultQuals.removeConst(); 637 638 // GC attributes are never picked up by members. 639 ResultQuals.removeObjCGCAttr(); 640 641 // TR 18037 does not allow fields to be declared with address spaces. 642 assert(!MemberTypeQuals.hasAddressSpace()); 643 644 Qualifiers NewQuals = ResultQuals + MemberTypeQuals; 645 if (NewQuals != MemberTypeQuals) 646 MemberType = Context.getQualifiedType(MemberType, NewQuals); 647 648 MarkDeclarationReferenced(Loc, *FI); 649 // FIXME: Might this end up being a qualified name? 650 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 651 OpLoc, MemberType); 652 BaseObjectIsPointer = false; 653 ResultQuals = NewQuals; 654 } 655 656 return Owned(Result); 657} 658 659/// ActOnDeclarationNameExpr - The parser has read some kind of name 660/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 661/// performs lookup on that name and returns an expression that refers 662/// to that name. This routine isn't directly called from the parser, 663/// because the parser doesn't know about DeclarationName. Rather, 664/// this routine is called by ActOnIdentifierExpr, 665/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 666/// which form the DeclarationName from the corresponding syntactic 667/// forms. 668/// 669/// HasTrailingLParen indicates whether this identifier is used in a 670/// function call context. LookupCtx is only used for a C++ 671/// qualified-id (foo::bar) to indicate the class or namespace that 672/// the identifier must be a member of. 673/// 674/// isAddressOfOperand means that this expression is the direct operand 675/// of an address-of operator. This matters because this is the only 676/// situation where a qualified name referencing a non-static member may 677/// appear outside a member function of this class. 678Sema::OwningExprResult 679Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 680 DeclarationName Name, bool HasTrailingLParen, 681 const CXXScopeSpec *SS, 682 bool isAddressOfOperand) { 683 // Could be enum-constant, value decl, instance variable, etc. 684 if (SS && SS->isInvalid()) 685 return ExprError(); 686 687 // C++ [temp.dep.expr]p3: 688 // An id-expression is type-dependent if it contains: 689 // -- a nested-name-specifier that contains a class-name that 690 // names a dependent type. 691 // FIXME: Member of the current instantiation. 692 if (SS && isDependentScopeSpecifier(*SS)) { 693 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 694 Loc, SS->getRange(), 695 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 696 isAddressOfOperand)); 697 } 698 699 LookupResult Lookup; 700 LookupParsedName(Lookup, S, SS, Name, LookupOrdinaryName, false, true, Loc); 701 702 if (Lookup.isAmbiguous()) { 703 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 704 SS && SS->isSet() ? SS->getRange() 705 : SourceRange()); 706 return ExprError(); 707 } 708 709 NamedDecl *D = Lookup.getAsSingleDecl(Context); 710 711 // If this reference is in an Objective-C method, then ivar lookup happens as 712 // well. 713 IdentifierInfo *II = Name.getAsIdentifierInfo(); 714 if (II && getCurMethodDecl()) { 715 // There are two cases to handle here. 1) scoped lookup could have failed, 716 // in which case we should look for an ivar. 2) scoped lookup could have 717 // found a decl, but that decl is outside the current instance method (i.e. 718 // a global variable). In these two cases, we do a lookup for an ivar with 719 // this name, if the lookup sucedes, we replace it our current decl. 720 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 721 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 722 ObjCInterfaceDecl *ClassDeclared; 723 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 724 // Check if referencing a field with __attribute__((deprecated)). 725 if (DiagnoseUseOfDecl(IV, Loc)) 726 return ExprError(); 727 728 // If we're referencing an invalid decl, just return this as a silent 729 // error node. The error diagnostic was already emitted on the decl. 730 if (IV->isInvalidDecl()) 731 return ExprError(); 732 733 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 734 // If a class method attemps to use a free standing ivar, this is 735 // an error. 736 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 737 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 738 << IV->getDeclName()); 739 // If a class method uses a global variable, even if an ivar with 740 // same name exists, use the global. 741 if (!IsClsMethod) { 742 if (IV->getAccessControl() == ObjCIvarDecl::Private && 743 ClassDeclared != IFace) 744 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 745 // FIXME: This should use a new expr for a direct reference, don't 746 // turn this into Self->ivar, just return a BareIVarExpr or something. 747 IdentifierInfo &II = Context.Idents.get("self"); 748 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 749 II, false); 750 MarkDeclarationReferenced(Loc, IV); 751 return Owned(new (Context) 752 ObjCIvarRefExpr(IV, IV->getType(), Loc, 753 SelfExpr.takeAs<Expr>(), true, true)); 754 } 755 } 756 } else if (getCurMethodDecl()->isInstanceMethod()) { 757 // We should warn if a local variable hides an ivar. 758 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 759 ObjCInterfaceDecl *ClassDeclared; 760 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 761 if (IV->getAccessControl() != ObjCIvarDecl::Private || 762 IFace == ClassDeclared) 763 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 764 } 765 } 766 // Needed to implement property "super.method" notation. 767 if (D == 0 && II->isStr("super")) { 768 QualType T; 769 770 if (getCurMethodDecl()->isInstanceMethod()) 771 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 772 getCurMethodDecl()->getClassInterface())); 773 else 774 T = Context.getObjCClassType(); 775 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 776 } 777 } 778 779 // Determine whether this name might be a candidate for 780 // argument-dependent lookup. 781 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 782 HasTrailingLParen; 783 784 if (ADL && D == 0) { 785 // We've seen something of the form 786 // 787 // identifier( 788 // 789 // and we did not find any entity by the name 790 // "identifier". However, this identifier is still subject to 791 // argument-dependent lookup, so keep track of the name. 792 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 793 Context.OverloadTy, 794 Loc)); 795 } 796 797 if (D == 0) { 798 // Otherwise, this could be an implicitly declared function reference (legal 799 // in C90, extension in C99). 800 if (HasTrailingLParen && II && 801 !getLangOptions().CPlusPlus) // Not in C++. 802 D = ImplicitlyDefineFunction(Loc, *II, S); 803 else { 804 // If this name wasn't predeclared and if this is not a function call, 805 // diagnose the problem. 806 if (SS && !SS->isEmpty()) 807 return ExprError(Diag(Loc, diag::err_no_member) 808 << Name << computeDeclContext(*SS, false) 809 << SS->getRange()); 810 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 811 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 812 return ExprError(Diag(Loc, diag::err_undeclared_use) 813 << Name.getAsString()); 814 else 815 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 816 } 817 } 818 819 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 820 // Warn about constructs like: 821 // if (void *X = foo()) { ... } else { X }. 822 // In the else block, the pointer is always false. 823 824 // FIXME: In a template instantiation, we don't have scope 825 // information to check this property. 826 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 827 Scope *CheckS = S; 828 while (CheckS) { 829 if (CheckS->isWithinElse() && 830 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 831 if (Var->getType()->isBooleanType()) 832 ExprError(Diag(Loc, diag::warn_value_always_false) 833 << Var->getDeclName()); 834 else 835 ExprError(Diag(Loc, diag::warn_value_always_zero) 836 << Var->getDeclName()); 837 break; 838 } 839 840 // Move up one more control parent to check again. 841 CheckS = CheckS->getControlParent(); 842 if (CheckS) 843 CheckS = CheckS->getParent(); 844 } 845 } 846 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 847 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 848 // C99 DR 316 says that, if a function type comes from a 849 // function definition (without a prototype), that type is only 850 // used for checking compatibility. Therefore, when referencing 851 // the function, we pretend that we don't have the full function 852 // type. 853 if (DiagnoseUseOfDecl(Func, Loc)) 854 return ExprError(); 855 856 QualType T = Func->getType(); 857 QualType NoProtoType = T; 858 if (const FunctionProtoType *Proto = T->getAs<FunctionProtoType>()) 859 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 860 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 861 } 862 } 863 864 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 865} 866/// \brief Cast member's object to its own class if necessary. 867bool 868Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 869 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 870 if (CXXRecordDecl *RD = 871 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 872 QualType DestType = 873 Context.getCanonicalType(Context.getTypeDeclType(RD)); 874 if (DestType->isDependentType() || From->getType()->isDependentType()) 875 return false; 876 QualType FromRecordType = From->getType(); 877 QualType DestRecordType = DestType; 878 if (FromRecordType->getAs<PointerType>()) { 879 DestType = Context.getPointerType(DestType); 880 FromRecordType = FromRecordType->getPointeeType(); 881 } 882 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 883 CheckDerivedToBaseConversion(FromRecordType, 884 DestRecordType, 885 From->getSourceRange().getBegin(), 886 From->getSourceRange())) 887 return true; 888 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 889 /*isLvalue=*/true); 890 } 891 return false; 892} 893 894/// \brief Build a MemberExpr AST node. 895static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, 896 const CXXScopeSpec *SS, NamedDecl *Member, 897 SourceLocation Loc, QualType Ty) { 898 if (SS && SS->isSet()) 899 return MemberExpr::Create(C, Base, isArrow, 900 (NestedNameSpecifier *)SS->getScopeRep(), 901 SS->getRange(), Member, Loc, 902 // FIXME: Explicit template argument lists 903 false, SourceLocation(), 0, 0, SourceLocation(), 904 Ty); 905 906 return new (C) MemberExpr(Base, isArrow, Member, Loc, Ty); 907} 908 909/// \brief Complete semantic analysis for a reference to the given declaration. 910Sema::OwningExprResult 911Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 912 bool HasTrailingLParen, 913 const CXXScopeSpec *SS, 914 bool isAddressOfOperand) { 915 assert(D && "Cannot refer to a NULL declaration"); 916 DeclarationName Name = D->getDeclName(); 917 918 // If this is an expression of the form &Class::member, don't build an 919 // implicit member ref, because we want a pointer to the member in general, 920 // not any specific instance's member. 921 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 922 DeclContext *DC = computeDeclContext(*SS); 923 if (D && isa<CXXRecordDecl>(DC)) { 924 QualType DType; 925 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 926 DType = FD->getType().getNonReferenceType(); 927 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 928 DType = Method->getType(); 929 } else if (isa<OverloadedFunctionDecl>(D)) { 930 DType = Context.OverloadTy; 931 } 932 // Could be an inner type. That's diagnosed below, so ignore it here. 933 if (!DType.isNull()) { 934 // The pointer is type- and value-dependent if it points into something 935 // dependent. 936 bool Dependent = DC->isDependentContext(); 937 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 938 } 939 } 940 } 941 942 // We may have found a field within an anonymous union or struct 943 // (C++ [class.union]). 944 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 945 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 946 return BuildAnonymousStructUnionMemberReference(Loc, FD); 947 948 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 949 if (!MD->isStatic()) { 950 // C++ [class.mfct.nonstatic]p2: 951 // [...] if name lookup (3.4.1) resolves the name in the 952 // id-expression to a nonstatic nontype member of class X or of 953 // a base class of X, the id-expression is transformed into a 954 // class member access expression (5.2.5) using (*this) (9.3.2) 955 // as the postfix-expression to the left of the '.' operator. 956 DeclContext *Ctx = 0; 957 QualType MemberType; 958 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 959 Ctx = FD->getDeclContext(); 960 MemberType = FD->getType(); 961 962 if (const ReferenceType *RefType = MemberType->getAs<ReferenceType>()) 963 MemberType = RefType->getPointeeType(); 964 else if (!FD->isMutable()) 965 MemberType 966 = Context.getQualifiedType(MemberType, 967 Qualifiers::fromCVRMask(MD->getTypeQualifiers())); 968 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 969 if (!Method->isStatic()) { 970 Ctx = Method->getParent(); 971 MemberType = Method->getType(); 972 } 973 } else if (FunctionTemplateDecl *FunTmpl 974 = dyn_cast<FunctionTemplateDecl>(D)) { 975 if (CXXMethodDecl *Method 976 = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())) { 977 if (!Method->isStatic()) { 978 Ctx = Method->getParent(); 979 MemberType = Context.OverloadTy; 980 } 981 } 982 } else if (OverloadedFunctionDecl *Ovl 983 = dyn_cast<OverloadedFunctionDecl>(D)) { 984 // FIXME: We need an abstraction for iterating over one or more function 985 // templates or functions. This code is far too repetitive! 986 for (OverloadedFunctionDecl::function_iterator 987 Func = Ovl->function_begin(), 988 FuncEnd = Ovl->function_end(); 989 Func != FuncEnd; ++Func) { 990 CXXMethodDecl *DMethod = 0; 991 if (FunctionTemplateDecl *FunTmpl 992 = dyn_cast<FunctionTemplateDecl>(*Func)) 993 DMethod = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 994 else 995 DMethod = dyn_cast<CXXMethodDecl>(*Func); 996 997 if (DMethod && !DMethod->isStatic()) { 998 Ctx = DMethod->getDeclContext(); 999 MemberType = Context.OverloadTy; 1000 break; 1001 } 1002 } 1003 } 1004 1005 if (Ctx && Ctx->isRecord()) { 1006 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1007 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1008 if ((Context.getCanonicalType(CtxType) 1009 == Context.getCanonicalType(ThisType)) || 1010 IsDerivedFrom(ThisType, CtxType)) { 1011 // Build the implicit member access expression. 1012 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1013 MD->getThisType(Context)); 1014 MarkDeclarationReferenced(Loc, D); 1015 if (PerformObjectMemberConversion(This, D)) 1016 return ExprError(); 1017 1018 bool ShouldCheckUse = true; 1019 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1020 // Don't diagnose the use of a virtual member function unless it's 1021 // explicitly qualified. 1022 if (MD->isVirtual() && (!SS || !SS->isSet())) 1023 ShouldCheckUse = false; 1024 } 1025 1026 if (ShouldCheckUse && DiagnoseUseOfDecl(D, Loc)) 1027 return ExprError(); 1028 return Owned(BuildMemberExpr(Context, This, true, SS, D, 1029 Loc, MemberType)); 1030 } 1031 } 1032 } 1033 } 1034 1035 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1036 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1037 if (MD->isStatic()) 1038 // "invalid use of member 'x' in static member function" 1039 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1040 << FD->getDeclName()); 1041 } 1042 1043 // Any other ways we could have found the field in a well-formed 1044 // program would have been turned into implicit member expressions 1045 // above. 1046 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1047 << FD->getDeclName()); 1048 } 1049 1050 if (isa<TypedefDecl>(D)) 1051 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1052 if (isa<ObjCInterfaceDecl>(D)) 1053 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1054 if (isa<NamespaceDecl>(D)) 1055 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1056 1057 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1058 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1059 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1060 false, false, SS); 1061 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1062 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1063 false, false, SS); 1064 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 1065 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 1066 /*TypeDependent=*/true, 1067 /*ValueDependent=*/true, SS); 1068 1069 ValueDecl *VD = cast<ValueDecl>(D); 1070 1071 // Check whether this declaration can be used. Note that we suppress 1072 // this check when we're going to perform argument-dependent lookup 1073 // on this function name, because this might not be the function 1074 // that overload resolution actually selects. 1075 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1076 HasTrailingLParen; 1077 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1078 return ExprError(); 1079 1080 // Only create DeclRefExpr's for valid Decl's. 1081 if (VD->isInvalidDecl()) 1082 return ExprError(); 1083 1084 // If the identifier reference is inside a block, and it refers to a value 1085 // that is outside the block, create a BlockDeclRefExpr instead of a 1086 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1087 // the block is formed. 1088 // 1089 // We do not do this for things like enum constants, global variables, etc, 1090 // as they do not get snapshotted. 1091 // 1092 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1093 MarkDeclarationReferenced(Loc, VD); 1094 QualType ExprTy = VD->getType().getNonReferenceType(); 1095 // The BlocksAttr indicates the variable is bound by-reference. 1096 if (VD->getAttr<BlocksAttr>()) 1097 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1098 // This is to record that a 'const' was actually synthesize and added. 1099 bool constAdded = !ExprTy.isConstQualified(); 1100 // Variable will be bound by-copy, make it const within the closure. 1101 1102 ExprTy.addConst(); 1103 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1104 constAdded)); 1105 } 1106 // If this reference is not in a block or if the referenced variable is 1107 // within the block, create a normal DeclRefExpr. 1108 1109 bool TypeDependent = false; 1110 bool ValueDependent = false; 1111 if (getLangOptions().CPlusPlus) { 1112 // C++ [temp.dep.expr]p3: 1113 // An id-expression is type-dependent if it contains: 1114 // - an identifier that was declared with a dependent type, 1115 if (VD->getType()->isDependentType()) 1116 TypeDependent = true; 1117 // - FIXME: a template-id that is dependent, 1118 // - a conversion-function-id that specifies a dependent type, 1119 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1120 Name.getCXXNameType()->isDependentType()) 1121 TypeDependent = true; 1122 // - a nested-name-specifier that contains a class-name that 1123 // names a dependent type. 1124 else if (SS && !SS->isEmpty()) { 1125 for (DeclContext *DC = computeDeclContext(*SS); 1126 DC; DC = DC->getParent()) { 1127 // FIXME: could stop early at namespace scope. 1128 if (DC->isRecord()) { 1129 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1130 if (Context.getTypeDeclType(Record)->isDependentType()) { 1131 TypeDependent = true; 1132 break; 1133 } 1134 } 1135 } 1136 } 1137 1138 // C++ [temp.dep.constexpr]p2: 1139 // 1140 // An identifier is value-dependent if it is: 1141 // - a name declared with a dependent type, 1142 if (TypeDependent) 1143 ValueDependent = true; 1144 // - the name of a non-type template parameter, 1145 else if (isa<NonTypeTemplateParmDecl>(VD)) 1146 ValueDependent = true; 1147 // - a constant with integral or enumeration type and is 1148 // initialized with an expression that is value-dependent 1149 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1150 if (Dcl->getType().getCVRQualifiers() == Qualifiers::Const && 1151 Dcl->getInit()) { 1152 ValueDependent = Dcl->getInit()->isValueDependent(); 1153 } 1154 } 1155 } 1156 1157 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1158 TypeDependent, ValueDependent, SS); 1159} 1160 1161Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1162 tok::TokenKind Kind) { 1163 PredefinedExpr::IdentType IT; 1164 1165 switch (Kind) { 1166 default: assert(0 && "Unknown simple primary expr!"); 1167 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1168 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1169 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1170 } 1171 1172 // Pre-defined identifiers are of type char[x], where x is the length of the 1173 // string. 1174 1175 Decl *currentDecl = getCurFunctionOrMethodDecl(); 1176 if (!currentDecl) { 1177 Diag(Loc, diag::ext_predef_outside_function); 1178 currentDecl = Context.getTranslationUnitDecl(); 1179 } 1180 1181 QualType ResTy; 1182 if (cast<DeclContext>(currentDecl)->isDependentContext()) { 1183 ResTy = Context.DependentTy; 1184 } else { 1185 unsigned Length = 1186 PredefinedExpr::ComputeName(Context, IT, currentDecl).length(); 1187 1188 llvm::APInt LengthI(32, Length + 1); 1189 ResTy = Context.CharTy.withConst(); 1190 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1191 } 1192 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1193} 1194 1195Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1196 llvm::SmallString<16> CharBuffer; 1197 CharBuffer.resize(Tok.getLength()); 1198 const char *ThisTokBegin = &CharBuffer[0]; 1199 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1200 1201 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1202 Tok.getLocation(), PP); 1203 if (Literal.hadError()) 1204 return ExprError(); 1205 1206 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1207 1208 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1209 Literal.isWide(), 1210 type, Tok.getLocation())); 1211} 1212 1213Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1214 // Fast path for a single digit (which is quite common). A single digit 1215 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1216 if (Tok.getLength() == 1) { 1217 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1218 unsigned IntSize = Context.Target.getIntWidth(); 1219 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1220 Context.IntTy, Tok.getLocation())); 1221 } 1222 1223 llvm::SmallString<512> IntegerBuffer; 1224 // Add padding so that NumericLiteralParser can overread by one character. 1225 IntegerBuffer.resize(Tok.getLength()+1); 1226 const char *ThisTokBegin = &IntegerBuffer[0]; 1227 1228 // Get the spelling of the token, which eliminates trigraphs, etc. 1229 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1230 1231 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1232 Tok.getLocation(), PP); 1233 if (Literal.hadError) 1234 return ExprError(); 1235 1236 Expr *Res; 1237 1238 if (Literal.isFloatingLiteral()) { 1239 QualType Ty; 1240 if (Literal.isFloat) 1241 Ty = Context.FloatTy; 1242 else if (!Literal.isLong) 1243 Ty = Context.DoubleTy; 1244 else 1245 Ty = Context.LongDoubleTy; 1246 1247 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1248 1249 // isExact will be set by GetFloatValue(). 1250 bool isExact = false; 1251 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1252 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1253 1254 } else if (!Literal.isIntegerLiteral()) { 1255 return ExprError(); 1256 } else { 1257 QualType Ty; 1258 1259 // long long is a C99 feature. 1260 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1261 Literal.isLongLong) 1262 Diag(Tok.getLocation(), diag::ext_longlong); 1263 1264 // Get the value in the widest-possible width. 1265 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1266 1267 if (Literal.GetIntegerValue(ResultVal)) { 1268 // If this value didn't fit into uintmax_t, warn and force to ull. 1269 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1270 Ty = Context.UnsignedLongLongTy; 1271 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1272 "long long is not intmax_t?"); 1273 } else { 1274 // If this value fits into a ULL, try to figure out what else it fits into 1275 // according to the rules of C99 6.4.4.1p5. 1276 1277 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1278 // be an unsigned int. 1279 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1280 1281 // Check from smallest to largest, picking the smallest type we can. 1282 unsigned Width = 0; 1283 if (!Literal.isLong && !Literal.isLongLong) { 1284 // Are int/unsigned possibilities? 1285 unsigned IntSize = Context.Target.getIntWidth(); 1286 1287 // Does it fit in a unsigned int? 1288 if (ResultVal.isIntN(IntSize)) { 1289 // Does it fit in a signed int? 1290 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1291 Ty = Context.IntTy; 1292 else if (AllowUnsigned) 1293 Ty = Context.UnsignedIntTy; 1294 Width = IntSize; 1295 } 1296 } 1297 1298 // Are long/unsigned long possibilities? 1299 if (Ty.isNull() && !Literal.isLongLong) { 1300 unsigned LongSize = Context.Target.getLongWidth(); 1301 1302 // Does it fit in a unsigned long? 1303 if (ResultVal.isIntN(LongSize)) { 1304 // Does it fit in a signed long? 1305 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1306 Ty = Context.LongTy; 1307 else if (AllowUnsigned) 1308 Ty = Context.UnsignedLongTy; 1309 Width = LongSize; 1310 } 1311 } 1312 1313 // Finally, check long long if needed. 1314 if (Ty.isNull()) { 1315 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1316 1317 // Does it fit in a unsigned long long? 1318 if (ResultVal.isIntN(LongLongSize)) { 1319 // Does it fit in a signed long long? 1320 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1321 Ty = Context.LongLongTy; 1322 else if (AllowUnsigned) 1323 Ty = Context.UnsignedLongLongTy; 1324 Width = LongLongSize; 1325 } 1326 } 1327 1328 // If we still couldn't decide a type, we probably have something that 1329 // does not fit in a signed long long, but has no U suffix. 1330 if (Ty.isNull()) { 1331 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1332 Ty = Context.UnsignedLongLongTy; 1333 Width = Context.Target.getLongLongWidth(); 1334 } 1335 1336 if (ResultVal.getBitWidth() != Width) 1337 ResultVal.trunc(Width); 1338 } 1339 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1340 } 1341 1342 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1343 if (Literal.isImaginary) 1344 Res = new (Context) ImaginaryLiteral(Res, 1345 Context.getComplexType(Res->getType())); 1346 1347 return Owned(Res); 1348} 1349 1350Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1351 SourceLocation R, ExprArg Val) { 1352 Expr *E = Val.takeAs<Expr>(); 1353 assert((E != 0) && "ActOnParenExpr() missing expr"); 1354 return Owned(new (Context) ParenExpr(L, R, E)); 1355} 1356 1357/// The UsualUnaryConversions() function is *not* called by this routine. 1358/// See C99 6.3.2.1p[2-4] for more details. 1359bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1360 SourceLocation OpLoc, 1361 const SourceRange &ExprRange, 1362 bool isSizeof) { 1363 if (exprType->isDependentType()) 1364 return false; 1365 1366 // C99 6.5.3.4p1: 1367 if (isa<FunctionType>(exprType)) { 1368 // alignof(function) is allowed as an extension. 1369 if (isSizeof) 1370 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1371 return false; 1372 } 1373 1374 // Allow sizeof(void)/alignof(void) as an extension. 1375 if (exprType->isVoidType()) { 1376 Diag(OpLoc, diag::ext_sizeof_void_type) 1377 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1378 return false; 1379 } 1380 1381 if (RequireCompleteType(OpLoc, exprType, 1382 isSizeof ? diag::err_sizeof_incomplete_type : 1383 PDiag(diag::err_alignof_incomplete_type) 1384 << ExprRange)) 1385 return true; 1386 1387 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1388 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1389 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1390 << exprType << isSizeof << ExprRange; 1391 return true; 1392 } 1393 1394 return false; 1395} 1396 1397bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1398 const SourceRange &ExprRange) { 1399 E = E->IgnoreParens(); 1400 1401 // alignof decl is always ok. 1402 if (isa<DeclRefExpr>(E)) 1403 return false; 1404 1405 // Cannot know anything else if the expression is dependent. 1406 if (E->isTypeDependent()) 1407 return false; 1408 1409 if (E->getBitField()) { 1410 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1411 return true; 1412 } 1413 1414 // Alignment of a field access is always okay, so long as it isn't a 1415 // bit-field. 1416 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1417 if (isa<FieldDecl>(ME->getMemberDecl())) 1418 return false; 1419 1420 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1421} 1422 1423/// \brief Build a sizeof or alignof expression given a type operand. 1424Action::OwningExprResult 1425Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1426 bool isSizeOf, SourceRange R) { 1427 if (T.isNull()) 1428 return ExprError(); 1429 1430 if (!T->isDependentType() && 1431 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1432 return ExprError(); 1433 1434 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1435 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1436 Context.getSizeType(), OpLoc, 1437 R.getEnd())); 1438} 1439 1440/// \brief Build a sizeof or alignof expression given an expression 1441/// operand. 1442Action::OwningExprResult 1443Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1444 bool isSizeOf, SourceRange R) { 1445 // Verify that the operand is valid. 1446 bool isInvalid = false; 1447 if (E->isTypeDependent()) { 1448 // Delay type-checking for type-dependent expressions. 1449 } else if (!isSizeOf) { 1450 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1451 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1452 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1453 isInvalid = true; 1454 } else { 1455 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1456 } 1457 1458 if (isInvalid) 1459 return ExprError(); 1460 1461 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1462 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1463 Context.getSizeType(), OpLoc, 1464 R.getEnd())); 1465} 1466 1467/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1468/// the same for @c alignof and @c __alignof 1469/// Note that the ArgRange is invalid if isType is false. 1470Action::OwningExprResult 1471Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1472 void *TyOrEx, const SourceRange &ArgRange) { 1473 // If error parsing type, ignore. 1474 if (TyOrEx == 0) return ExprError(); 1475 1476 if (isType) { 1477 // FIXME: Preserve type source info. 1478 QualType ArgTy = GetTypeFromParser(TyOrEx); 1479 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1480 } 1481 1482 // Get the end location. 1483 Expr *ArgEx = (Expr *)TyOrEx; 1484 Action::OwningExprResult Result 1485 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1486 1487 if (Result.isInvalid()) 1488 DeleteExpr(ArgEx); 1489 1490 return move(Result); 1491} 1492 1493QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1494 if (V->isTypeDependent()) 1495 return Context.DependentTy; 1496 1497 // These operators return the element type of a complex type. 1498 if (const ComplexType *CT = V->getType()->getAs<ComplexType>()) 1499 return CT->getElementType(); 1500 1501 // Otherwise they pass through real integer and floating point types here. 1502 if (V->getType()->isArithmeticType()) 1503 return V->getType(); 1504 1505 // Reject anything else. 1506 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1507 << (isReal ? "__real" : "__imag"); 1508 return QualType(); 1509} 1510 1511 1512 1513Action::OwningExprResult 1514Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1515 tok::TokenKind Kind, ExprArg Input) { 1516 // Since this might be a postfix expression, get rid of ParenListExprs. 1517 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1518 Expr *Arg = (Expr *)Input.get(); 1519 1520 UnaryOperator::Opcode Opc; 1521 switch (Kind) { 1522 default: assert(0 && "Unknown unary op!"); 1523 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1524 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1525 } 1526 1527 if (getLangOptions().CPlusPlus && 1528 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1529 // Which overloaded operator? 1530 OverloadedOperatorKind OverOp = 1531 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1532 1533 // C++ [over.inc]p1: 1534 // 1535 // [...] If the function is a member function with one 1536 // parameter (which shall be of type int) or a non-member 1537 // function with two parameters (the second of which shall be 1538 // of type int), it defines the postfix increment operator ++ 1539 // for objects of that type. When the postfix increment is 1540 // called as a result of using the ++ operator, the int 1541 // argument will have value zero. 1542 Expr *Args[2] = { 1543 Arg, 1544 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1545 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1546 }; 1547 1548 // Build the candidate set for overloading 1549 OverloadCandidateSet CandidateSet; 1550 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1551 1552 // Perform overload resolution. 1553 OverloadCandidateSet::iterator Best; 1554 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1555 case OR_Success: { 1556 // We found a built-in operator or an overloaded operator. 1557 FunctionDecl *FnDecl = Best->Function; 1558 1559 if (FnDecl) { 1560 // We matched an overloaded operator. Build a call to that 1561 // operator. 1562 1563 // Convert the arguments. 1564 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1565 if (PerformObjectArgumentInitialization(Arg, Method)) 1566 return ExprError(); 1567 } else { 1568 // Convert the arguments. 1569 if (PerformCopyInitialization(Arg, 1570 FnDecl->getParamDecl(0)->getType(), 1571 "passing")) 1572 return ExprError(); 1573 } 1574 1575 // Determine the result type 1576 QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 1577 1578 // Build the actual expression node. 1579 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1580 SourceLocation()); 1581 UsualUnaryConversions(FnExpr); 1582 1583 Input.release(); 1584 Args[0] = Arg; 1585 1586 ExprOwningPtr<CXXOperatorCallExpr> 1587 TheCall(this, new (Context) CXXOperatorCallExpr(Context, OverOp, 1588 FnExpr, Args, 2, 1589 ResultTy, OpLoc)); 1590 1591 if (CheckCallReturnType(FnDecl->getResultType(), OpLoc, TheCall.get(), 1592 FnDecl)) 1593 return ExprError(); 1594 return Owned(TheCall.release()); 1595 1596 } else { 1597 // We matched a built-in operator. Convert the arguments, then 1598 // break out so that we will build the appropriate built-in 1599 // operator node. 1600 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1601 "passing")) 1602 return ExprError(); 1603 1604 break; 1605 } 1606 } 1607 1608 case OR_No_Viable_Function: { 1609 // No viable function; try checking this as a built-in operator, which 1610 // will fail and provide a diagnostic. Then, print the overload 1611 // candidates. 1612 OwningExprResult Result = CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1613 assert(Result.isInvalid() && 1614 "C++ postfix-unary operator overloading is missing candidates!"); 1615 if (Result.isInvalid()) 1616 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1617 1618 return move(Result); 1619 } 1620 1621 case OR_Ambiguous: 1622 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1623 << UnaryOperator::getOpcodeStr(Opc) 1624 << Arg->getSourceRange(); 1625 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1626 return ExprError(); 1627 1628 case OR_Deleted: 1629 Diag(OpLoc, diag::err_ovl_deleted_oper) 1630 << Best->Function->isDeleted() 1631 << UnaryOperator::getOpcodeStr(Opc) 1632 << Arg->getSourceRange(); 1633 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1634 return ExprError(); 1635 } 1636 1637 // Either we found no viable overloaded operator or we matched a 1638 // built-in operator. In either case, fall through to trying to 1639 // build a built-in operation. 1640 } 1641 1642 Input.release(); 1643 Input = Arg; 1644 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1645} 1646 1647Action::OwningExprResult 1648Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1649 ExprArg Idx, SourceLocation RLoc) { 1650 // Since this might be a postfix expression, get rid of ParenListExprs. 1651 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1652 1653 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1654 *RHSExp = static_cast<Expr*>(Idx.get()); 1655 1656 if (getLangOptions().CPlusPlus && 1657 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1658 Base.release(); 1659 Idx.release(); 1660 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1661 Context.DependentTy, RLoc)); 1662 } 1663 1664 if (getLangOptions().CPlusPlus && 1665 (LHSExp->getType()->isRecordType() || 1666 LHSExp->getType()->isEnumeralType() || 1667 RHSExp->getType()->isRecordType() || 1668 RHSExp->getType()->isEnumeralType())) { 1669 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1670 // to the candidate set. 1671 OverloadCandidateSet CandidateSet; 1672 Expr *Args[2] = { LHSExp, RHSExp }; 1673 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1674 SourceRange(LLoc, RLoc)); 1675 1676 // Perform overload resolution. 1677 OverloadCandidateSet::iterator Best; 1678 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1679 case OR_Success: { 1680 // We found a built-in operator or an overloaded operator. 1681 FunctionDecl *FnDecl = Best->Function; 1682 1683 if (FnDecl) { 1684 // We matched an overloaded operator. Build a call to that 1685 // operator. 1686 1687 // Convert the arguments. 1688 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1689 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1690 PerformCopyInitialization(RHSExp, 1691 FnDecl->getParamDecl(0)->getType(), 1692 "passing")) 1693 return ExprError(); 1694 } else { 1695 // Convert the arguments. 1696 if (PerformCopyInitialization(LHSExp, 1697 FnDecl->getParamDecl(0)->getType(), 1698 "passing") || 1699 PerformCopyInitialization(RHSExp, 1700 FnDecl->getParamDecl(1)->getType(), 1701 "passing")) 1702 return ExprError(); 1703 } 1704 1705 // Determine the result type 1706 QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 1707 1708 // Build the actual expression node. 1709 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1710 SourceLocation()); 1711 UsualUnaryConversions(FnExpr); 1712 1713 Base.release(); 1714 Idx.release(); 1715 Args[0] = LHSExp; 1716 Args[1] = RHSExp; 1717 1718 ExprOwningPtr<CXXOperatorCallExpr> 1719 TheCall(this, new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1720 FnExpr, Args, 2, 1721 ResultTy, RLoc)); 1722 if (CheckCallReturnType(FnDecl->getResultType(), LLoc, TheCall.get(), 1723 FnDecl)) 1724 return ExprError(); 1725 1726 return Owned(TheCall.release()); 1727 } else { 1728 // We matched a built-in operator. Convert the arguments, then 1729 // break out so that we will build the appropriate built-in 1730 // operator node. 1731 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1732 "passing") || 1733 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1734 "passing")) 1735 return ExprError(); 1736 1737 break; 1738 } 1739 } 1740 1741 case OR_No_Viable_Function: 1742 // No viable function; fall through to handling this as a 1743 // built-in operator, which will produce an error message for us. 1744 break; 1745 1746 case OR_Ambiguous: 1747 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1748 << "[]" 1749 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1750 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1751 return ExprError(); 1752 1753 case OR_Deleted: 1754 Diag(LLoc, diag::err_ovl_deleted_oper) 1755 << Best->Function->isDeleted() 1756 << "[]" 1757 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1758 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1759 return ExprError(); 1760 } 1761 1762 // Either we found no viable overloaded operator or we matched a 1763 // built-in operator. In either case, fall through to trying to 1764 // build a built-in operation. 1765 } 1766 1767 // Perform default conversions. 1768 DefaultFunctionArrayConversion(LHSExp); 1769 DefaultFunctionArrayConversion(RHSExp); 1770 1771 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1772 1773 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1774 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1775 // in the subscript position. As a result, we need to derive the array base 1776 // and index from the expression types. 1777 Expr *BaseExpr, *IndexExpr; 1778 QualType ResultType; 1779 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1780 BaseExpr = LHSExp; 1781 IndexExpr = RHSExp; 1782 ResultType = Context.DependentTy; 1783 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1784 BaseExpr = LHSExp; 1785 IndexExpr = RHSExp; 1786 ResultType = PTy->getPointeeType(); 1787 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1788 // Handle the uncommon case of "123[Ptr]". 1789 BaseExpr = RHSExp; 1790 IndexExpr = LHSExp; 1791 ResultType = PTy->getPointeeType(); 1792 } else if (const ObjCObjectPointerType *PTy = 1793 LHSTy->getAs<ObjCObjectPointerType>()) { 1794 BaseExpr = LHSExp; 1795 IndexExpr = RHSExp; 1796 ResultType = PTy->getPointeeType(); 1797 } else if (const ObjCObjectPointerType *PTy = 1798 RHSTy->getAs<ObjCObjectPointerType>()) { 1799 // Handle the uncommon case of "123[Ptr]". 1800 BaseExpr = RHSExp; 1801 IndexExpr = LHSExp; 1802 ResultType = PTy->getPointeeType(); 1803 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) { 1804 BaseExpr = LHSExp; // vectors: V[123] 1805 IndexExpr = RHSExp; 1806 1807 // FIXME: need to deal with const... 1808 ResultType = VTy->getElementType(); 1809 } else if (LHSTy->isArrayType()) { 1810 // If we see an array that wasn't promoted by 1811 // DefaultFunctionArrayConversion, it must be an array that 1812 // wasn't promoted because of the C90 rule that doesn't 1813 // allow promoting non-lvalue arrays. Warn, then 1814 // force the promotion here. 1815 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1816 LHSExp->getSourceRange(); 1817 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy), 1818 CastExpr::CK_ArrayToPointerDecay); 1819 LHSTy = LHSExp->getType(); 1820 1821 BaseExpr = LHSExp; 1822 IndexExpr = RHSExp; 1823 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1824 } else if (RHSTy->isArrayType()) { 1825 // Same as previous, except for 123[f().a] case 1826 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1827 RHSExp->getSourceRange(); 1828 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy), 1829 CastExpr::CK_ArrayToPointerDecay); 1830 RHSTy = RHSExp->getType(); 1831 1832 BaseExpr = RHSExp; 1833 IndexExpr = LHSExp; 1834 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1835 } else { 1836 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1837 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1838 } 1839 // C99 6.5.2.1p1 1840 if (!(IndexExpr->getType()->isIntegerType() && 1841 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1842 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1843 << IndexExpr->getSourceRange()); 1844 1845 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || 1846 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) 1847 && !IndexExpr->isTypeDependent()) 1848 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange(); 1849 1850 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1851 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1852 // type. Note that Functions are not objects, and that (in C99 parlance) 1853 // incomplete types are not object types. 1854 if (ResultType->isFunctionType()) { 1855 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1856 << ResultType << BaseExpr->getSourceRange(); 1857 return ExprError(); 1858 } 1859 1860 if (!ResultType->isDependentType() && 1861 RequireCompleteType(LLoc, ResultType, 1862 PDiag(diag::err_subscript_incomplete_type) 1863 << BaseExpr->getSourceRange())) 1864 return ExprError(); 1865 1866 // Diagnose bad cases where we step over interface counts. 1867 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1868 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1869 << ResultType << BaseExpr->getSourceRange(); 1870 return ExprError(); 1871 } 1872 1873 Base.release(); 1874 Idx.release(); 1875 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1876 ResultType, RLoc)); 1877} 1878 1879QualType Sema:: 1880CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1881 const IdentifierInfo *CompName, 1882 SourceLocation CompLoc) { 1883 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements, 1884 // see FIXME there. 1885 // 1886 // FIXME: This logic can be greatly simplified by splitting it along 1887 // halving/not halving and reworking the component checking. 1888 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>(); 1889 1890 // The vector accessor can't exceed the number of elements. 1891 const char *compStr = CompName->getNameStart(); 1892 1893 // This flag determines whether or not the component is one of the four 1894 // special names that indicate a subset of exactly half the elements are 1895 // to be selected. 1896 bool HalvingSwizzle = false; 1897 1898 // This flag determines whether or not CompName has an 's' char prefix, 1899 // indicating that it is a string of hex values to be used as vector indices. 1900 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1901 1902 // Check that we've found one of the special components, or that the component 1903 // names must come from the same set. 1904 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1905 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1906 HalvingSwizzle = true; 1907 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1908 do 1909 compStr++; 1910 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1911 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1912 do 1913 compStr++; 1914 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1915 } 1916 1917 if (!HalvingSwizzle && *compStr) { 1918 // We didn't get to the end of the string. This means the component names 1919 // didn't come from the same set *or* we encountered an illegal name. 1920 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1921 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1922 return QualType(); 1923 } 1924 1925 // Ensure no component accessor exceeds the width of the vector type it 1926 // operates on. 1927 if (!HalvingSwizzle) { 1928 compStr = CompName->getNameStart(); 1929 1930 if (HexSwizzle) 1931 compStr++; 1932 1933 while (*compStr) { 1934 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1935 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1936 << baseType << SourceRange(CompLoc); 1937 return QualType(); 1938 } 1939 } 1940 } 1941 1942 // If this is a halving swizzle, verify that the base type has an even 1943 // number of elements. 1944 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1945 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1946 << baseType << SourceRange(CompLoc); 1947 return QualType(); 1948 } 1949 1950 // The component accessor looks fine - now we need to compute the actual type. 1951 // The vector type is implied by the component accessor. For example, 1952 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1953 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1954 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1955 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1956 : CompName->getLength(); 1957 if (HexSwizzle) 1958 CompSize--; 1959 1960 if (CompSize == 1) 1961 return vecType->getElementType(); 1962 1963 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1964 // Now look up the TypeDefDecl from the vector type. Without this, 1965 // diagostics look bad. We want extended vector types to appear built-in. 1966 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1967 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1968 return Context.getTypedefType(ExtVectorDecls[i]); 1969 } 1970 return VT; // should never get here (a typedef type should always be found). 1971} 1972 1973static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1974 IdentifierInfo *Member, 1975 const Selector &Sel, 1976 ASTContext &Context) { 1977 1978 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1979 return PD; 1980 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1981 return OMD; 1982 1983 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1984 E = PDecl->protocol_end(); I != E; ++I) { 1985 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1986 Context)) 1987 return D; 1988 } 1989 return 0; 1990} 1991 1992static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1993 IdentifierInfo *Member, 1994 const Selector &Sel, 1995 ASTContext &Context) { 1996 // Check protocols on qualified interfaces. 1997 Decl *GDecl = 0; 1998 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1999 E = QIdTy->qual_end(); I != E; ++I) { 2000 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2001 GDecl = PD; 2002 break; 2003 } 2004 // Also must look for a getter name which uses property syntax. 2005 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 2006 GDecl = OMD; 2007 break; 2008 } 2009 } 2010 if (!GDecl) { 2011 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2012 E = QIdTy->qual_end(); I != E; ++I) { 2013 // Search in the protocol-qualifier list of current protocol. 2014 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2015 if (GDecl) 2016 return GDecl; 2017 } 2018 } 2019 return GDecl; 2020} 2021 2022Action::OwningExprResult 2023Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2024 tok::TokenKind OpKind, SourceLocation MemberLoc, 2025 DeclarationName MemberName, 2026 bool HasExplicitTemplateArgs, 2027 SourceLocation LAngleLoc, 2028 const TemplateArgument *ExplicitTemplateArgs, 2029 unsigned NumExplicitTemplateArgs, 2030 SourceLocation RAngleLoc, 2031 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 2032 NamedDecl *FirstQualifierInScope) { 2033 if (SS && SS->isInvalid()) 2034 return ExprError(); 2035 2036 // Since this might be a postfix expression, get rid of ParenListExprs. 2037 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 2038 2039 Expr *BaseExpr = Base.takeAs<Expr>(); 2040 assert(BaseExpr && "no base expression"); 2041 2042 // Perform default conversions. 2043 DefaultFunctionArrayConversion(BaseExpr); 2044 2045 QualType BaseType = BaseExpr->getType(); 2046 // If this is an Objective-C pseudo-builtin and a definition is provided then 2047 // use that. 2048 if (BaseType->isObjCIdType()) { 2049 // We have an 'id' type. Rather than fall through, we check if this 2050 // is a reference to 'isa'. 2051 if (BaseType != Context.ObjCIdRedefinitionType) { 2052 BaseType = Context.ObjCIdRedefinitionType; 2053 ImpCastExprToType(BaseExpr, BaseType, CastExpr::CK_BitCast); 2054 } 2055 } 2056 assert(!BaseType.isNull() && "no type for member expression"); 2057 2058 // Handle properties on ObjC 'Class' types. 2059 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2060 // Also must look for a getter name which uses property syntax. 2061 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2062 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2063 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2064 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2065 ObjCMethodDecl *Getter; 2066 // FIXME: need to also look locally in the implementation. 2067 if ((Getter = IFace->lookupClassMethod(Sel))) { 2068 // Check the use of this method. 2069 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2070 return ExprError(); 2071 } 2072 // If we found a getter then this may be a valid dot-reference, we 2073 // will look for the matching setter, in case it is needed. 2074 Selector SetterSel = 2075 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2076 PP.getSelectorTable(), Member); 2077 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2078 if (!Setter) { 2079 // If this reference is in an @implementation, also check for 'private' 2080 // methods. 2081 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 2082 } 2083 // Look through local category implementations associated with the class. 2084 if (!Setter) 2085 Setter = IFace->getCategoryClassMethod(SetterSel); 2086 2087 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2088 return ExprError(); 2089 2090 if (Getter || Setter) { 2091 QualType PType; 2092 2093 if (Getter) 2094 PType = Getter->getResultType(); 2095 else 2096 // Get the expression type from Setter's incoming parameter. 2097 PType = (*(Setter->param_end() -1))->getType(); 2098 // FIXME: we must check that the setter has property type. 2099 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, 2100 PType, 2101 Setter, MemberLoc, BaseExpr)); 2102 } 2103 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2104 << MemberName << BaseType); 2105 } 2106 } 2107 2108 if (BaseType->isObjCClassType() && 2109 BaseType != Context.ObjCClassRedefinitionType) { 2110 BaseType = Context.ObjCClassRedefinitionType; 2111 ImpCastExprToType(BaseExpr, BaseType, CastExpr::CK_BitCast); 2112 } 2113 2114 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2115 // must have pointer type, and the accessed type is the pointee. 2116 if (OpKind == tok::arrow) { 2117 if (BaseType->isDependentType()) { 2118 NestedNameSpecifier *Qualifier = 0; 2119 if (SS) { 2120 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2121 if (!FirstQualifierInScope) 2122 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2123 } 2124 2125 return Owned(CXXUnresolvedMemberExpr::Create(Context, BaseExpr, true, 2126 OpLoc, Qualifier, 2127 SS? SS->getRange() : SourceRange(), 2128 FirstQualifierInScope, 2129 MemberName, 2130 MemberLoc, 2131 HasExplicitTemplateArgs, 2132 LAngleLoc, 2133 ExplicitTemplateArgs, 2134 NumExplicitTemplateArgs, 2135 RAngleLoc)); 2136 } 2137 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2138 BaseType = PT->getPointeeType(); 2139 else if (BaseType->isObjCObjectPointerType()) 2140 ; 2141 else 2142 return ExprError(Diag(MemberLoc, 2143 diag::err_typecheck_member_reference_arrow) 2144 << BaseType << BaseExpr->getSourceRange()); 2145 } else if (BaseType->isDependentType()) { 2146 // Require that the base type isn't a pointer type 2147 // (so we'll report an error for) 2148 // T* t; 2149 // t.f; 2150 // 2151 // In Obj-C++, however, the above expression is valid, since it could be 2152 // accessing the 'f' property if T is an Obj-C interface. The extra check 2153 // allows this, while still reporting an error if T is a struct pointer. 2154 const PointerType *PT = BaseType->getAs<PointerType>(); 2155 2156 if (!PT || (getLangOptions().ObjC1 && 2157 !PT->getPointeeType()->isRecordType())) { 2158 NestedNameSpecifier *Qualifier = 0; 2159 if (SS) { 2160 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2161 if (!FirstQualifierInScope) 2162 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2163 } 2164 2165 return Owned(CXXUnresolvedMemberExpr::Create(Context, 2166 BaseExpr, false, 2167 OpLoc, 2168 Qualifier, 2169 SS? SS->getRange() : SourceRange(), 2170 FirstQualifierInScope, 2171 MemberName, 2172 MemberLoc, 2173 HasExplicitTemplateArgs, 2174 LAngleLoc, 2175 ExplicitTemplateArgs, 2176 NumExplicitTemplateArgs, 2177 RAngleLoc)); 2178 } 2179 } 2180 2181 // Handle field access to simple records. This also handles access to fields 2182 // of the ObjC 'id' struct. 2183 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2184 RecordDecl *RDecl = RTy->getDecl(); 2185 if (RequireCompleteType(OpLoc, BaseType, 2186 PDiag(diag::err_typecheck_incomplete_tag) 2187 << BaseExpr->getSourceRange())) 2188 return ExprError(); 2189 2190 DeclContext *DC = RDecl; 2191 if (SS && SS->isSet()) { 2192 // If the member name was a qualified-id, look into the 2193 // nested-name-specifier. 2194 DC = computeDeclContext(*SS, false); 2195 2196 if (!isa<TypeDecl>(DC)) { 2197 Diag(MemberLoc, diag::err_qualified_member_nonclass) 2198 << DC << SS->getRange(); 2199 return ExprError(); 2200 } 2201 2202 // FIXME: If DC is not computable, we should build a 2203 // CXXUnresolvedMemberExpr. 2204 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2205 } 2206 2207 // The record definition is complete, now make sure the member is valid. 2208 LookupResult Result; 2209 LookupQualifiedName(Result, DC, MemberName, LookupMemberName, false); 2210 2211 if (Result.empty()) 2212 return ExprError(Diag(MemberLoc, diag::err_no_member) 2213 << MemberName << DC << BaseExpr->getSourceRange()); 2214 if (Result.isAmbiguous()) { 2215 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2216 BaseExpr->getSourceRange()); 2217 return ExprError(); 2218 } 2219 2220 NamedDecl *MemberDecl = Result.getAsSingleDecl(Context); 2221 2222 if (SS && SS->isSet()) { 2223 TypeDecl* TyD = cast<TypeDecl>(MemberDecl->getDeclContext()); 2224 QualType BaseTypeCanon 2225 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2226 QualType MemberTypeCanon 2227 = Context.getCanonicalType(Context.getTypeDeclType(TyD)); 2228 2229 if (BaseTypeCanon != MemberTypeCanon && 2230 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2231 return ExprError(Diag(SS->getBeginLoc(), 2232 diag::err_not_direct_base_or_virtual) 2233 << MemberTypeCanon << BaseTypeCanon); 2234 } 2235 2236 // If the decl being referenced had an error, return an error for this 2237 // sub-expr without emitting another error, in order to avoid cascading 2238 // error cases. 2239 if (MemberDecl->isInvalidDecl()) 2240 return ExprError(); 2241 2242 bool ShouldCheckUse = true; 2243 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { 2244 // Don't diagnose the use of a virtual member function unless it's 2245 // explicitly qualified. 2246 if (MD->isVirtual() && (!SS || !SS->isSet())) 2247 ShouldCheckUse = false; 2248 } 2249 2250 // Check the use of this field 2251 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2252 return ExprError(); 2253 2254 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2255 // We may have found a field within an anonymous union or struct 2256 // (C++ [class.union]). 2257 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2258 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2259 BaseExpr, OpLoc); 2260 2261 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2262 QualType MemberType = FD->getType(); 2263 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2264 MemberType = Ref->getPointeeType(); 2265 else { 2266 Qualifiers BaseQuals = BaseType.getQualifiers(); 2267 BaseQuals.removeObjCGCAttr(); 2268 if (FD->isMutable()) BaseQuals.removeConst(); 2269 2270 Qualifiers MemberQuals 2271 = Context.getCanonicalType(MemberType).getQualifiers(); 2272 2273 Qualifiers Combined = BaseQuals + MemberQuals; 2274 if (Combined != MemberQuals) 2275 MemberType = Context.getQualifiedType(MemberType, Combined); 2276 } 2277 2278 MarkDeclarationReferenced(MemberLoc, FD); 2279 if (PerformObjectMemberConversion(BaseExpr, FD)) 2280 return ExprError(); 2281 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2282 FD, MemberLoc, MemberType)); 2283 } 2284 2285 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2286 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2287 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2288 Var, MemberLoc, 2289 Var->getType().getNonReferenceType())); 2290 } 2291 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2292 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2293 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2294 MemberFn, MemberLoc, 2295 MemberFn->getType())); 2296 } 2297 if (FunctionTemplateDecl *FunTmpl 2298 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2299 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2300 2301 if (HasExplicitTemplateArgs) 2302 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2303 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2304 SS? SS->getRange() : SourceRange(), 2305 FunTmpl, MemberLoc, true, 2306 LAngleLoc, ExplicitTemplateArgs, 2307 NumExplicitTemplateArgs, RAngleLoc, 2308 Context.OverloadTy)); 2309 2310 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2311 FunTmpl, MemberLoc, 2312 Context.OverloadTy)); 2313 } 2314 if (OverloadedFunctionDecl *Ovl 2315 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2316 if (HasExplicitTemplateArgs) 2317 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2318 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2319 SS? SS->getRange() : SourceRange(), 2320 Ovl, MemberLoc, true, 2321 LAngleLoc, ExplicitTemplateArgs, 2322 NumExplicitTemplateArgs, RAngleLoc, 2323 Context.OverloadTy)); 2324 2325 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2326 Ovl, MemberLoc, Context.OverloadTy)); 2327 } 2328 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2329 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2330 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2331 Enum, MemberLoc, Enum->getType())); 2332 } 2333 if (isa<TypeDecl>(MemberDecl)) 2334 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2335 << MemberName << int(OpKind == tok::arrow)); 2336 2337 // We found a declaration kind that we didn't expect. This is a 2338 // generic error message that tells the user that she can't refer 2339 // to this member with '.' or '->'. 2340 return ExprError(Diag(MemberLoc, 2341 diag::err_typecheck_member_reference_unknown) 2342 << MemberName << int(OpKind == tok::arrow)); 2343 } 2344 2345 // Handle pseudo-destructors (C++ [expr.pseudo]). Since anything referring 2346 // into a record type was handled above, any destructor we see here is a 2347 // pseudo-destructor. 2348 if (MemberName.getNameKind() == DeclarationName::CXXDestructorName) { 2349 // C++ [expr.pseudo]p2: 2350 // The left hand side of the dot operator shall be of scalar type. The 2351 // left hand side of the arrow operator shall be of pointer to scalar 2352 // type. 2353 if (!BaseType->isScalarType()) 2354 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 2355 << BaseType << BaseExpr->getSourceRange()); 2356 2357 // [...] The type designated by the pseudo-destructor-name shall be the 2358 // same as the object type. 2359 if (!MemberName.getCXXNameType()->isDependentType() && 2360 !Context.hasSameUnqualifiedType(BaseType, MemberName.getCXXNameType())) 2361 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_type_mismatch) 2362 << BaseType << MemberName.getCXXNameType() 2363 << BaseExpr->getSourceRange() << SourceRange(MemberLoc)); 2364 2365 // [...] Furthermore, the two type-names in a pseudo-destructor-name of 2366 // the form 2367 // 2368 // ::[opt] nested-name-specifier[opt] type-name :: ̃ type-name 2369 // 2370 // shall designate the same scalar type. 2371 // 2372 // FIXME: DPG can't see any way to trigger this particular clause, so it 2373 // isn't checked here. 2374 2375 // FIXME: We've lost the precise spelling of the type by going through 2376 // DeclarationName. Can we do better? 2377 return Owned(new (Context) CXXPseudoDestructorExpr(Context, BaseExpr, 2378 OpKind == tok::arrow, 2379 OpLoc, 2380 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2381 SS? SS->getRange() : SourceRange(), 2382 MemberName.getCXXNameType(), 2383 MemberLoc)); 2384 } 2385 2386 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2387 // (*Obj).ivar. 2388 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2389 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2390 const ObjCObjectPointerType *OPT = BaseType->getAs<ObjCObjectPointerType>(); 2391 const ObjCInterfaceType *IFaceT = 2392 OPT ? OPT->getInterfaceType() : BaseType->getAs<ObjCInterfaceType>(); 2393 if (IFaceT) { 2394 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2395 2396 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2397 ObjCInterfaceDecl *ClassDeclared; 2398 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2399 2400 if (IV) { 2401 // If the decl being referenced had an error, return an error for this 2402 // sub-expr without emitting another error, in order to avoid cascading 2403 // error cases. 2404 if (IV->isInvalidDecl()) 2405 return ExprError(); 2406 2407 // Check whether we can reference this field. 2408 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2409 return ExprError(); 2410 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2411 IV->getAccessControl() != ObjCIvarDecl::Package) { 2412 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2413 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2414 ClassOfMethodDecl = MD->getClassInterface(); 2415 else if (ObjCImpDecl && getCurFunctionDecl()) { 2416 // Case of a c-function declared inside an objc implementation. 2417 // FIXME: For a c-style function nested inside an objc implementation 2418 // class, there is no implementation context available, so we pass 2419 // down the context as argument to this routine. Ideally, this context 2420 // need be passed down in the AST node and somehow calculated from the 2421 // AST for a function decl. 2422 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2423 if (ObjCImplementationDecl *IMPD = 2424 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2425 ClassOfMethodDecl = IMPD->getClassInterface(); 2426 else if (ObjCCategoryImplDecl* CatImplClass = 2427 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2428 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2429 } 2430 2431 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2432 if (ClassDeclared != IDecl || 2433 ClassOfMethodDecl != ClassDeclared) 2434 Diag(MemberLoc, diag::error_private_ivar_access) 2435 << IV->getDeclName(); 2436 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2437 // @protected 2438 Diag(MemberLoc, diag::error_protected_ivar_access) 2439 << IV->getDeclName(); 2440 } 2441 2442 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2443 MemberLoc, BaseExpr, 2444 OpKind == tok::arrow)); 2445 } 2446 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2447 << IDecl->getDeclName() << MemberName 2448 << BaseExpr->getSourceRange()); 2449 } 2450 } 2451 // Handle properties on 'id' and qualified "id". 2452 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2453 BaseType->isObjCQualifiedIdType())) { 2454 const ObjCObjectPointerType *QIdTy = BaseType->getAs<ObjCObjectPointerType>(); 2455 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2456 2457 // Check protocols on qualified interfaces. 2458 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2459 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2460 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2461 // Check the use of this declaration 2462 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2463 return ExprError(); 2464 2465 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2466 MemberLoc, BaseExpr)); 2467 } 2468 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2469 // Check the use of this method. 2470 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2471 return ExprError(); 2472 2473 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2474 OMD->getResultType(), 2475 OMD, OpLoc, MemberLoc, 2476 NULL, 0)); 2477 } 2478 } 2479 2480 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2481 << MemberName << BaseType); 2482 } 2483 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2484 // pointer to a (potentially qualified) interface type. 2485 const ObjCObjectPointerType *OPT; 2486 if (OpKind == tok::period && 2487 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2488 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2489 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2490 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2491 2492 // Search for a declared property first. 2493 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2494 // Check whether we can reference this property. 2495 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2496 return ExprError(); 2497 QualType ResTy = PD->getType(); 2498 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2499 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2500 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2501 ResTy = Getter->getResultType(); 2502 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2503 MemberLoc, BaseExpr)); 2504 } 2505 // Check protocols on qualified interfaces. 2506 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2507 E = OPT->qual_end(); I != E; ++I) 2508 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2509 // Check whether we can reference this property. 2510 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2511 return ExprError(); 2512 2513 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2514 MemberLoc, BaseExpr)); 2515 } 2516 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2517 E = OPT->qual_end(); I != E; ++I) 2518 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2519 // Check whether we can reference this property. 2520 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2521 return ExprError(); 2522 2523 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2524 MemberLoc, BaseExpr)); 2525 } 2526 // If that failed, look for an "implicit" property by seeing if the nullary 2527 // selector is implemented. 2528 2529 // FIXME: The logic for looking up nullary and unary selectors should be 2530 // shared with the code in ActOnInstanceMessage. 2531 2532 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2533 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2534 2535 // If this reference is in an @implementation, check for 'private' methods. 2536 if (!Getter) 2537 Getter = IFace->lookupPrivateInstanceMethod(Sel); 2538 2539 // Look through local category implementations associated with the class. 2540 if (!Getter) 2541 Getter = IFace->getCategoryInstanceMethod(Sel); 2542 if (Getter) { 2543 // Check if we can reference this property. 2544 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2545 return ExprError(); 2546 } 2547 // If we found a getter then this may be a valid dot-reference, we 2548 // will look for the matching setter, in case it is needed. 2549 Selector SetterSel = 2550 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2551 PP.getSelectorTable(), Member); 2552 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2553 if (!Setter) { 2554 // If this reference is in an @implementation, also check for 'private' 2555 // methods. 2556 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 2557 } 2558 // Look through local category implementations associated with the class. 2559 if (!Setter) 2560 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2561 2562 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2563 return ExprError(); 2564 2565 if (Getter || Setter) { 2566 QualType PType; 2567 2568 if (Getter) 2569 PType = Getter->getResultType(); 2570 else 2571 // Get the expression type from Setter's incoming parameter. 2572 PType = (*(Setter->param_end() -1))->getType(); 2573 // FIXME: we must check that the setter has property type. 2574 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2575 Setter, MemberLoc, BaseExpr)); 2576 } 2577 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2578 << MemberName << BaseType); 2579 } 2580 2581 // Handle the following exceptional case (*Obj).isa. 2582 if (OpKind == tok::period && 2583 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2584 MemberName.getAsIdentifierInfo()->isStr("isa")) 2585 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2586 Context.getObjCIdType())); 2587 2588 // Handle 'field access' to vectors, such as 'V.xx'. 2589 if (BaseType->isExtVectorType()) { 2590 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2591 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2592 if (ret.isNull()) 2593 return ExprError(); 2594 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2595 MemberLoc)); 2596 } 2597 2598 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2599 << BaseType << BaseExpr->getSourceRange(); 2600 2601 // If the user is trying to apply -> or . to a function or function 2602 // pointer, it's probably because they forgot parentheses to call 2603 // the function. Suggest the addition of those parentheses. 2604 if (BaseType == Context.OverloadTy || 2605 BaseType->isFunctionType() || 2606 (BaseType->isPointerType() && 2607 BaseType->getAs<PointerType>()->isFunctionType())) { 2608 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2609 Diag(Loc, diag::note_member_reference_needs_call) 2610 << CodeModificationHint::CreateInsertion(Loc, "()"); 2611 } 2612 2613 return ExprError(); 2614} 2615 2616Action::OwningExprResult 2617Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2618 tok::TokenKind OpKind, SourceLocation MemberLoc, 2619 IdentifierInfo &Member, 2620 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2621 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2622 DeclarationName(&Member), ObjCImpDecl, SS); 2623} 2624 2625Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2626 FunctionDecl *FD, 2627 ParmVarDecl *Param) { 2628 if (Param->hasUnparsedDefaultArg()) { 2629 Diag (CallLoc, 2630 diag::err_use_of_default_argument_to_function_declared_later) << 2631 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2632 Diag(UnparsedDefaultArgLocs[Param], 2633 diag::note_default_argument_declared_here); 2634 } else { 2635 if (Param->hasUninstantiatedDefaultArg()) { 2636 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2637 2638 // Instantiate the expression. 2639 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2640 2641 InstantiatingTemplate Inst(*this, CallLoc, Param, 2642 ArgList.getInnermost().getFlatArgumentList(), 2643 ArgList.getInnermost().flat_size()); 2644 2645 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2646 if (Result.isInvalid()) 2647 return ExprError(); 2648 2649 if (SetParamDefaultArgument(Param, move(Result), 2650 /*FIXME:EqualLoc*/ 2651 UninstExpr->getSourceRange().getBegin())) 2652 return ExprError(); 2653 } 2654 2655 Expr *DefaultExpr = Param->getDefaultArg(); 2656 2657 // If the default expression creates temporaries, we need to 2658 // push them to the current stack of expression temporaries so they'll 2659 // be properly destroyed. 2660 if (CXXExprWithTemporaries *E 2661 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2662 assert(!E->shouldDestroyTemporaries() && 2663 "Can't destroy temporaries in a default argument expr!"); 2664 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2665 ExprTemporaries.push_back(E->getTemporary(I)); 2666 } 2667 } 2668 2669 // We already type-checked the argument, so we know it works. 2670 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2671} 2672 2673/// ConvertArgumentsForCall - Converts the arguments specified in 2674/// Args/NumArgs to the parameter types of the function FDecl with 2675/// function prototype Proto. Call is the call expression itself, and 2676/// Fn is the function expression. For a C++ member function, this 2677/// routine does not attempt to convert the object argument. Returns 2678/// true if the call is ill-formed. 2679bool 2680Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2681 FunctionDecl *FDecl, 2682 const FunctionProtoType *Proto, 2683 Expr **Args, unsigned NumArgs, 2684 SourceLocation RParenLoc) { 2685 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2686 // assignment, to the types of the corresponding parameter, ... 2687 unsigned NumArgsInProto = Proto->getNumArgs(); 2688 unsigned NumArgsToCheck = NumArgs; 2689 bool Invalid = false; 2690 2691 // If too few arguments are available (and we don't have default 2692 // arguments for the remaining parameters), don't make the call. 2693 if (NumArgs < NumArgsInProto) { 2694 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2695 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2696 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2697 // Use default arguments for missing arguments 2698 NumArgsToCheck = NumArgsInProto; 2699 Call->setNumArgs(Context, NumArgsInProto); 2700 } 2701 2702 // If too many are passed and not variadic, error on the extras and drop 2703 // them. 2704 if (NumArgs > NumArgsInProto) { 2705 if (!Proto->isVariadic()) { 2706 Diag(Args[NumArgsInProto]->getLocStart(), 2707 diag::err_typecheck_call_too_many_args) 2708 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2709 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2710 Args[NumArgs-1]->getLocEnd()); 2711 // This deletes the extra arguments. 2712 Call->setNumArgs(Context, NumArgsInProto); 2713 Invalid = true; 2714 } 2715 NumArgsToCheck = NumArgsInProto; 2716 } 2717 2718 // Continue to check argument types (even if we have too few/many args). 2719 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2720 QualType ProtoArgType = Proto->getArgType(i); 2721 2722 Expr *Arg; 2723 if (i < NumArgs) { 2724 Arg = Args[i]; 2725 2726 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2727 ProtoArgType, 2728 PDiag(diag::err_call_incomplete_argument) 2729 << Arg->getSourceRange())) 2730 return true; 2731 2732 // Pass the argument. 2733 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2734 return true; 2735 } else { 2736 ParmVarDecl *Param = FDecl->getParamDecl(i); 2737 2738 OwningExprResult ArgExpr = 2739 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2740 FDecl, Param); 2741 if (ArgExpr.isInvalid()) 2742 return true; 2743 2744 Arg = ArgExpr.takeAs<Expr>(); 2745 } 2746 2747 Call->setArg(i, Arg); 2748 } 2749 2750 // If this is a variadic call, handle args passed through "...". 2751 if (Proto->isVariadic()) { 2752 VariadicCallType CallType = VariadicFunction; 2753 if (Fn->getType()->isBlockPointerType()) 2754 CallType = VariadicBlock; // Block 2755 else if (isa<MemberExpr>(Fn)) 2756 CallType = VariadicMethod; 2757 2758 // Promote the arguments (C99 6.5.2.2p7). 2759 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2760 Expr *Arg = Args[i]; 2761 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2762 Call->setArg(i, Arg); 2763 } 2764 } 2765 2766 return Invalid; 2767} 2768 2769/// \brief "Deconstruct" the function argument of a call expression to find 2770/// the underlying declaration (if any), the name of the called function, 2771/// whether argument-dependent lookup is available, whether it has explicit 2772/// template arguments, etc. 2773void Sema::DeconstructCallFunction(Expr *FnExpr, 2774 NamedDecl *&Function, 2775 DeclarationName &Name, 2776 NestedNameSpecifier *&Qualifier, 2777 SourceRange &QualifierRange, 2778 bool &ArgumentDependentLookup, 2779 bool &HasExplicitTemplateArguments, 2780 const TemplateArgument *&ExplicitTemplateArgs, 2781 unsigned &NumExplicitTemplateArgs) { 2782 // Set defaults for all of the output parameters. 2783 Function = 0; 2784 Name = DeclarationName(); 2785 Qualifier = 0; 2786 QualifierRange = SourceRange(); 2787 ArgumentDependentLookup = getLangOptions().CPlusPlus; 2788 HasExplicitTemplateArguments = false; 2789 2790 // If we're directly calling a function, get the appropriate declaration. 2791 // Also, in C++, keep track of whether we should perform argument-dependent 2792 // lookup and whether there were any explicitly-specified template arguments. 2793 while (true) { 2794 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2795 FnExpr = IcExpr->getSubExpr(); 2796 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2797 // Parentheses around a function disable ADL 2798 // (C++0x [basic.lookup.argdep]p1). 2799 ArgumentDependentLookup = false; 2800 FnExpr = PExpr->getSubExpr(); 2801 } else if (isa<UnaryOperator>(FnExpr) && 2802 cast<UnaryOperator>(FnExpr)->getOpcode() 2803 == UnaryOperator::AddrOf) { 2804 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2805 } else if (QualifiedDeclRefExpr *QDRExpr 2806 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) { 2807 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2808 ArgumentDependentLookup = false; 2809 Qualifier = QDRExpr->getQualifier(); 2810 QualifierRange = QDRExpr->getQualifierRange(); 2811 Function = dyn_cast<NamedDecl>(QDRExpr->getDecl()); 2812 break; 2813 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2814 Function = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2815 break; 2816 } else if (UnresolvedFunctionNameExpr *DepName 2817 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2818 Name = DepName->getName(); 2819 break; 2820 } else if (TemplateIdRefExpr *TemplateIdRef 2821 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2822 Function = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2823 if (!Function) 2824 Function = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2825 HasExplicitTemplateArguments = true; 2826 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2827 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2828 2829 // C++ [temp.arg.explicit]p6: 2830 // [Note: For simple function names, argument dependent lookup (3.4.2) 2831 // applies even when the function name is not visible within the 2832 // scope of the call. This is because the call still has the syntactic 2833 // form of a function call (3.4.1). But when a function template with 2834 // explicit template arguments is used, the call does not have the 2835 // correct syntactic form unless there is a function template with 2836 // that name visible at the point of the call. If no such name is 2837 // visible, the call is not syntactically well-formed and 2838 // argument-dependent lookup does not apply. If some such name is 2839 // visible, argument dependent lookup applies and additional function 2840 // templates may be found in other namespaces. 2841 // 2842 // The summary of this paragraph is that, if we get to this point and the 2843 // template-id was not a qualified name, then argument-dependent lookup 2844 // is still possible. 2845 if ((Qualifier = TemplateIdRef->getQualifier())) { 2846 ArgumentDependentLookup = false; 2847 QualifierRange = TemplateIdRef->getQualifierRange(); 2848 } 2849 break; 2850 } else { 2851 // Any kind of name that does not refer to a declaration (or 2852 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2853 ArgumentDependentLookup = false; 2854 break; 2855 } 2856 } 2857} 2858 2859/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2860/// This provides the location of the left/right parens and a list of comma 2861/// locations. 2862Action::OwningExprResult 2863Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2864 MultiExprArg args, 2865 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2866 unsigned NumArgs = args.size(); 2867 2868 // Since this might be a postfix expression, get rid of ParenListExprs. 2869 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2870 2871 Expr *Fn = fn.takeAs<Expr>(); 2872 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2873 assert(Fn && "no function call expression"); 2874 FunctionDecl *FDecl = NULL; 2875 NamedDecl *NDecl = NULL; 2876 DeclarationName UnqualifiedName; 2877 2878 if (getLangOptions().CPlusPlus) { 2879 // If this is a pseudo-destructor expression, build the call immediately. 2880 if (isa<CXXPseudoDestructorExpr>(Fn)) { 2881 if (NumArgs > 0) { 2882 // Pseudo-destructor calls should not have any arguments. 2883 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args) 2884 << CodeModificationHint::CreateRemoval( 2885 SourceRange(Args[0]->getLocStart(), 2886 Args[NumArgs-1]->getLocEnd())); 2887 2888 for (unsigned I = 0; I != NumArgs; ++I) 2889 Args[I]->Destroy(Context); 2890 2891 NumArgs = 0; 2892 } 2893 2894 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy, 2895 RParenLoc)); 2896 } 2897 2898 // Determine whether this is a dependent call inside a C++ template, 2899 // in which case we won't do any semantic analysis now. 2900 // FIXME: Will need to cache the results of name lookup (including ADL) in 2901 // Fn. 2902 bool Dependent = false; 2903 if (Fn->isTypeDependent()) 2904 Dependent = true; 2905 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2906 Dependent = true; 2907 2908 if (Dependent) 2909 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2910 Context.DependentTy, RParenLoc)); 2911 2912 // Determine whether this is a call to an object (C++ [over.call.object]). 2913 if (Fn->getType()->isRecordType()) 2914 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2915 CommaLocs, RParenLoc)); 2916 2917 // Determine whether this is a call to a member function. 2918 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2919 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2920 if (isa<OverloadedFunctionDecl>(MemDecl) || 2921 isa<CXXMethodDecl>(MemDecl) || 2922 (isa<FunctionTemplateDecl>(MemDecl) && 2923 isa<CXXMethodDecl>( 2924 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2925 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2926 CommaLocs, RParenLoc)); 2927 } 2928 2929 // Determine whether this is a call to a pointer-to-member function. 2930 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Fn->IgnoreParens())) { 2931 if (BO->getOpcode() == BinaryOperator::PtrMemD || 2932 BO->getOpcode() == BinaryOperator::PtrMemI) { 2933 const FunctionProtoType *FPT = cast<FunctionProtoType>(BO->getType()); 2934 QualType ResultTy = FPT->getResultType().getNonReferenceType(); 2935 2936 ExprOwningPtr<CXXMemberCallExpr> 2937 TheCall(this, new (Context) CXXMemberCallExpr(Context, BO, Args, 2938 NumArgs, ResultTy, 2939 RParenLoc)); 2940 2941 if (CheckCallReturnType(FPT->getResultType(), 2942 BO->getRHS()->getSourceRange().getBegin(), 2943 TheCall.get(), 0)) 2944 return ExprError(); 2945 2946 if (ConvertArgumentsForCall(&*TheCall, BO, 0, FPT, Args, NumArgs, 2947 RParenLoc)) 2948 return ExprError(); 2949 2950 return Owned(MaybeBindToTemporary(TheCall.release()).release()); 2951 } 2952 } 2953 } 2954 2955 // If we're directly calling a function, get the appropriate declaration. 2956 // Also, in C++, keep track of whether we should perform argument-dependent 2957 // lookup and whether there were any explicitly-specified template arguments. 2958 bool ADL = true; 2959 bool HasExplicitTemplateArgs = 0; 2960 const TemplateArgument *ExplicitTemplateArgs = 0; 2961 unsigned NumExplicitTemplateArgs = 0; 2962 NestedNameSpecifier *Qualifier = 0; 2963 SourceRange QualifierRange; 2964 DeconstructCallFunction(Fn, NDecl, UnqualifiedName, Qualifier, QualifierRange, 2965 ADL,HasExplicitTemplateArgs, ExplicitTemplateArgs, 2966 NumExplicitTemplateArgs); 2967 2968 OverloadedFunctionDecl *Ovl = 0; 2969 FunctionTemplateDecl *FunctionTemplate = 0; 2970 if (NDecl) { 2971 FDecl = dyn_cast<FunctionDecl>(NDecl); 2972 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2973 FDecl = FunctionTemplate->getTemplatedDecl(); 2974 else 2975 FDecl = dyn_cast<FunctionDecl>(NDecl); 2976 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2977 } 2978 2979 if (Ovl || FunctionTemplate || 2980 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2981 // We don't perform ADL for implicit declarations of builtins. 2982 if (FDecl && FDecl->getBuiltinID() && FDecl->isImplicit()) 2983 ADL = false; 2984 2985 // We don't perform ADL in C. 2986 if (!getLangOptions().CPlusPlus) 2987 ADL = false; 2988 2989 if (Ovl || FunctionTemplate || ADL) { 2990 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2991 HasExplicitTemplateArgs, 2992 ExplicitTemplateArgs, 2993 NumExplicitTemplateArgs, 2994 LParenLoc, Args, NumArgs, CommaLocs, 2995 RParenLoc, ADL); 2996 if (!FDecl) 2997 return ExprError(); 2998 2999 // Update Fn to refer to the actual function selected. 3000 Expr *NewFn = 0; 3001 if (Qualifier) 3002 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 3003 Fn->getLocStart(), 3004 false, false, 3005 QualifierRange, 3006 Qualifier); 3007 else 3008 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 3009 Fn->getLocStart()); 3010 Fn->Destroy(Context); 3011 Fn = NewFn; 3012 } 3013 } 3014 3015 // Promote the function operand. 3016 UsualUnaryConversions(Fn); 3017 3018 // Make the call expr early, before semantic checks. This guarantees cleanup 3019 // of arguments and function on error. 3020 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 3021 Args, NumArgs, 3022 Context.BoolTy, 3023 RParenLoc)); 3024 3025 const FunctionType *FuncT; 3026 if (!Fn->getType()->isBlockPointerType()) { 3027 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 3028 // have type pointer to function". 3029 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 3030 if (PT == 0) 3031 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 3032 << Fn->getType() << Fn->getSourceRange()); 3033 FuncT = PT->getPointeeType()->getAs<FunctionType>(); 3034 } else { // This is a block call. 3035 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 3036 getAs<FunctionType>(); 3037 } 3038 if (FuncT == 0) 3039 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 3040 << Fn->getType() << Fn->getSourceRange()); 3041 3042 // Check for a valid return type 3043 if (CheckCallReturnType(FuncT->getResultType(), 3044 Fn->getSourceRange().getBegin(), TheCall.get(), 3045 FDecl)) 3046 return ExprError(); 3047 3048 // We know the result type of the call, set it. 3049 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 3050 3051 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 3052 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 3053 RParenLoc)) 3054 return ExprError(); 3055 } else { 3056 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 3057 3058 if (FDecl) { 3059 // Check if we have too few/too many template arguments, based 3060 // on our knowledge of the function definition. 3061 const FunctionDecl *Def = 0; 3062 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 3063 const FunctionProtoType *Proto = 3064 Def->getType()->getAs<FunctionProtoType>(); 3065 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 3066 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 3067 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 3068 } 3069 } 3070 } 3071 3072 // Promote the arguments (C99 6.5.2.2p6). 3073 for (unsigned i = 0; i != NumArgs; i++) { 3074 Expr *Arg = Args[i]; 3075 DefaultArgumentPromotion(Arg); 3076 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 3077 Arg->getType(), 3078 PDiag(diag::err_call_incomplete_argument) 3079 << Arg->getSourceRange())) 3080 return ExprError(); 3081 TheCall->setArg(i, Arg); 3082 } 3083 } 3084 3085 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 3086 if (!Method->isStatic()) 3087 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 3088 << Fn->getSourceRange()); 3089 3090 // Check for sentinels 3091 if (NDecl) 3092 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 3093 3094 // Do special checking on direct calls to functions. 3095 if (FDecl) { 3096 if (CheckFunctionCall(FDecl, TheCall.get())) 3097 return ExprError(); 3098 3099 if (unsigned BuiltinID = FDecl->getBuiltinID()) 3100 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 3101 } else if (NDecl) { 3102 if (CheckBlockCall(NDecl, TheCall.get())) 3103 return ExprError(); 3104 } 3105 3106 return MaybeBindToTemporary(TheCall.take()); 3107} 3108 3109Action::OwningExprResult 3110Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 3111 SourceLocation RParenLoc, ExprArg InitExpr) { 3112 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 3113 //FIXME: Preserve type source info. 3114 QualType literalType = GetTypeFromParser(Ty); 3115 // FIXME: put back this assert when initializers are worked out. 3116 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 3117 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 3118 3119 if (literalType->isArrayType()) { 3120 if (literalType->isVariableArrayType()) 3121 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 3122 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 3123 } else if (!literalType->isDependentType() && 3124 RequireCompleteType(LParenLoc, literalType, 3125 PDiag(diag::err_typecheck_decl_incomplete_type) 3126 << SourceRange(LParenLoc, 3127 literalExpr->getSourceRange().getEnd()))) 3128 return ExprError(); 3129 3130 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 3131 DeclarationName(), /*FIXME:DirectInit=*/false)) 3132 return ExprError(); 3133 3134 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 3135 if (isFileScope) { // 6.5.2.5p3 3136 if (CheckForConstantInitializer(literalExpr, literalType)) 3137 return ExprError(); 3138 } 3139 InitExpr.release(); 3140 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 3141 literalExpr, isFileScope)); 3142} 3143 3144Action::OwningExprResult 3145Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 3146 SourceLocation RBraceLoc) { 3147 unsigned NumInit = initlist.size(); 3148 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 3149 3150 // Semantic analysis for initializers is done by ActOnDeclarator() and 3151 // CheckInitializer() - it requires knowledge of the object being intialized. 3152 3153 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 3154 RBraceLoc); 3155 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 3156 return Owned(E); 3157} 3158 3159static CastExpr::CastKind getScalarCastKind(ASTContext &Context, 3160 QualType SrcTy, QualType DestTy) { 3161 if (Context.getCanonicalType(SrcTy).getUnqualifiedType() == 3162 Context.getCanonicalType(DestTy).getUnqualifiedType()) 3163 return CastExpr::CK_NoOp; 3164 3165 if (SrcTy->hasPointerRepresentation()) { 3166 if (DestTy->hasPointerRepresentation()) 3167 return CastExpr::CK_BitCast; 3168 if (DestTy->isIntegerType()) 3169 return CastExpr::CK_PointerToIntegral; 3170 } 3171 3172 if (SrcTy->isIntegerType()) { 3173 if (DestTy->isIntegerType()) 3174 return CastExpr::CK_IntegralCast; 3175 if (DestTy->hasPointerRepresentation()) 3176 return CastExpr::CK_IntegralToPointer; 3177 if (DestTy->isRealFloatingType()) 3178 return CastExpr::CK_IntegralToFloating; 3179 } 3180 3181 if (SrcTy->isRealFloatingType()) { 3182 if (DestTy->isRealFloatingType()) 3183 return CastExpr::CK_FloatingCast; 3184 if (DestTy->isIntegerType()) 3185 return CastExpr::CK_FloatingToIntegral; 3186 } 3187 3188 // FIXME: Assert here. 3189 // assert(false && "Unhandled cast combination!"); 3190 return CastExpr::CK_Unknown; 3191} 3192 3193/// CheckCastTypes - Check type constraints for casting between types. 3194bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 3195 CastExpr::CastKind& Kind, 3196 CXXMethodDecl *& ConversionDecl, 3197 bool FunctionalStyle) { 3198 if (getLangOptions().CPlusPlus) 3199 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 3200 ConversionDecl); 3201 3202 DefaultFunctionArrayConversion(castExpr); 3203 3204 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 3205 // type needs to be scalar. 3206 if (castType->isVoidType()) { 3207 // Cast to void allows any expr type. 3208 Kind = CastExpr::CK_ToVoid; 3209 return false; 3210 } 3211 3212 if (!castType->isScalarType() && !castType->isVectorType()) { 3213 if (Context.getCanonicalType(castType).getUnqualifiedType() == 3214 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 3215 (castType->isStructureType() || castType->isUnionType())) { 3216 // GCC struct/union extension: allow cast to self. 3217 // FIXME: Check that the cast destination type is complete. 3218 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3219 << castType << castExpr->getSourceRange(); 3220 Kind = CastExpr::CK_NoOp; 3221 return false; 3222 } 3223 3224 if (castType->isUnionType()) { 3225 // GCC cast to union extension 3226 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3227 RecordDecl::field_iterator Field, FieldEnd; 3228 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3229 Field != FieldEnd; ++Field) { 3230 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3231 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3232 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3233 << castExpr->getSourceRange(); 3234 break; 3235 } 3236 } 3237 if (Field == FieldEnd) 3238 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3239 << castExpr->getType() << castExpr->getSourceRange(); 3240 Kind = CastExpr::CK_ToUnion; 3241 return false; 3242 } 3243 3244 // Reject any other conversions to non-scalar types. 3245 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3246 << castType << castExpr->getSourceRange(); 3247 } 3248 3249 if (!castExpr->getType()->isScalarType() && 3250 !castExpr->getType()->isVectorType()) { 3251 return Diag(castExpr->getLocStart(), 3252 diag::err_typecheck_expect_scalar_operand) 3253 << castExpr->getType() << castExpr->getSourceRange(); 3254 } 3255 3256 if (castType->isExtVectorType()) 3257 return CheckExtVectorCast(TyR, castType, castExpr, Kind); 3258 3259 if (castType->isVectorType()) 3260 return CheckVectorCast(TyR, castType, castExpr->getType(), Kind); 3261 if (castExpr->getType()->isVectorType()) 3262 return CheckVectorCast(TyR, castExpr->getType(), castType, Kind); 3263 3264 if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) 3265 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3266 3267 if (isa<ObjCSelectorExpr>(castExpr)) 3268 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3269 3270 if (!castType->isArithmeticType()) { 3271 QualType castExprType = castExpr->getType(); 3272 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3273 return Diag(castExpr->getLocStart(), 3274 diag::err_cast_pointer_from_non_pointer_int) 3275 << castExprType << castExpr->getSourceRange(); 3276 } else if (!castExpr->getType()->isArithmeticType()) { 3277 if (!castType->isIntegralType() && castType->isArithmeticType()) 3278 return Diag(castExpr->getLocStart(), 3279 diag::err_cast_pointer_to_non_pointer_int) 3280 << castType << castExpr->getSourceRange(); 3281 } 3282 3283 Kind = getScalarCastKind(Context, castExpr->getType(), castType); 3284 return false; 3285} 3286 3287bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty, 3288 CastExpr::CastKind &Kind) { 3289 assert(VectorTy->isVectorType() && "Not a vector type!"); 3290 3291 if (Ty->isVectorType() || Ty->isIntegerType()) { 3292 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3293 return Diag(R.getBegin(), 3294 Ty->isVectorType() ? 3295 diag::err_invalid_conversion_between_vectors : 3296 diag::err_invalid_conversion_between_vector_and_integer) 3297 << VectorTy << Ty << R; 3298 } else 3299 return Diag(R.getBegin(), 3300 diag::err_invalid_conversion_between_vector_and_scalar) 3301 << VectorTy << Ty << R; 3302 3303 Kind = CastExpr::CK_BitCast; 3304 return false; 3305} 3306 3307bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *&CastExpr, 3308 CastExpr::CastKind &Kind) { 3309 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3310 3311 QualType SrcTy = CastExpr->getType(); 3312 3313 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3314 // an ExtVectorType. 3315 if (SrcTy->isVectorType()) { 3316 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3317 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3318 << DestTy << SrcTy << R; 3319 Kind = CastExpr::CK_BitCast; 3320 return false; 3321 } 3322 3323 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3324 // conversion will take place first from scalar to elt type, and then 3325 // splat from elt type to vector. 3326 if (SrcTy->isPointerType()) 3327 return Diag(R.getBegin(), 3328 diag::err_invalid_conversion_between_vector_and_scalar) 3329 << DestTy << SrcTy << R; 3330 3331 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType(); 3332 ImpCastExprToType(CastExpr, DestElemTy, 3333 getScalarCastKind(Context, SrcTy, DestElemTy)); 3334 3335 Kind = CastExpr::CK_VectorSplat; 3336 return false; 3337} 3338 3339Action::OwningExprResult 3340Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3341 SourceLocation RParenLoc, ExprArg Op) { 3342 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3343 3344 assert((Ty != 0) && (Op.get() != 0) && 3345 "ActOnCastExpr(): missing type or expr"); 3346 3347 Expr *castExpr = (Expr *)Op.get(); 3348 //FIXME: Preserve type source info. 3349 QualType castType = GetTypeFromParser(Ty); 3350 3351 // If the Expr being casted is a ParenListExpr, handle it specially. 3352 if (isa<ParenListExpr>(castExpr)) 3353 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3354 CXXMethodDecl *Method = 0; 3355 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3356 Kind, Method)) 3357 return ExprError(); 3358 3359 if (Method) { 3360 OwningExprResult CastArg = BuildCXXCastArgument(LParenLoc, castType, Kind, 3361 Method, move(Op)); 3362 3363 if (CastArg.isInvalid()) 3364 return ExprError(); 3365 3366 castExpr = CastArg.takeAs<Expr>(); 3367 } else { 3368 Op.release(); 3369 } 3370 3371 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3372 Kind, castExpr, castType, 3373 LParenLoc, RParenLoc)); 3374} 3375 3376/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3377/// of comma binary operators. 3378Action::OwningExprResult 3379Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3380 Expr *expr = EA.takeAs<Expr>(); 3381 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3382 if (!E) 3383 return Owned(expr); 3384 3385 OwningExprResult Result(*this, E->getExpr(0)); 3386 3387 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3388 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3389 Owned(E->getExpr(i))); 3390 3391 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3392} 3393 3394Action::OwningExprResult 3395Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3396 SourceLocation RParenLoc, ExprArg Op, 3397 QualType Ty) { 3398 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3399 3400 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3401 // then handle it as such. 3402 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3403 if (PE->getNumExprs() == 0) { 3404 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3405 return ExprError(); 3406 } 3407 3408 llvm::SmallVector<Expr *, 8> initExprs; 3409 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3410 initExprs.push_back(PE->getExpr(i)); 3411 3412 // FIXME: This means that pretty-printing the final AST will produce curly 3413 // braces instead of the original commas. 3414 Op.release(); 3415 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3416 initExprs.size(), RParenLoc); 3417 E->setType(Ty); 3418 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3419 Owned(E)); 3420 } else { 3421 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3422 // sequence of BinOp comma operators. 3423 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3424 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3425 } 3426} 3427 3428Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3429 SourceLocation R, 3430 MultiExprArg Val) { 3431 unsigned nexprs = Val.size(); 3432 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3433 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3434 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3435 return Owned(expr); 3436} 3437 3438/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3439/// In that case, lhs = cond. 3440/// C99 6.5.15 3441QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3442 SourceLocation QuestionLoc) { 3443 // C++ is sufficiently different to merit its own checker. 3444 if (getLangOptions().CPlusPlus) 3445 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3446 3447 UsualUnaryConversions(Cond); 3448 UsualUnaryConversions(LHS); 3449 UsualUnaryConversions(RHS); 3450 QualType CondTy = Cond->getType(); 3451 QualType LHSTy = LHS->getType(); 3452 QualType RHSTy = RHS->getType(); 3453 3454 // first, check the condition. 3455 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3456 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3457 << CondTy; 3458 return QualType(); 3459 } 3460 3461 // Now check the two expressions. 3462 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3463 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3464 3465 // If both operands have arithmetic type, do the usual arithmetic conversions 3466 // to find a common type: C99 6.5.15p3,5. 3467 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3468 UsualArithmeticConversions(LHS, RHS); 3469 return LHS->getType(); 3470 } 3471 3472 // If both operands are the same structure or union type, the result is that 3473 // type. 3474 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3475 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3476 if (LHSRT->getDecl() == RHSRT->getDecl()) 3477 // "If both the operands have structure or union type, the result has 3478 // that type." This implies that CV qualifiers are dropped. 3479 return LHSTy.getUnqualifiedType(); 3480 // FIXME: Type of conditional expression must be complete in C mode. 3481 } 3482 3483 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3484 // The following || allows only one side to be void (a GCC-ism). 3485 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3486 if (!LHSTy->isVoidType()) 3487 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3488 << RHS->getSourceRange(); 3489 if (!RHSTy->isVoidType()) 3490 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3491 << LHS->getSourceRange(); 3492 ImpCastExprToType(LHS, Context.VoidTy, CastExpr::CK_ToVoid); 3493 ImpCastExprToType(RHS, Context.VoidTy, CastExpr::CK_ToVoid); 3494 return Context.VoidTy; 3495 } 3496 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3497 // the type of the other operand." 3498 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3499 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3500 // promote the null to a pointer. 3501 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_Unknown); 3502 return LHSTy; 3503 } 3504 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3505 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3506 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_Unknown); 3507 return RHSTy; 3508 } 3509 // Handle things like Class and struct objc_class*. Here we case the result 3510 // to the pseudo-builtin, because that will be implicitly cast back to the 3511 // redefinition type if an attempt is made to access its fields. 3512 if (LHSTy->isObjCClassType() && 3513 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3514 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3515 return LHSTy; 3516 } 3517 if (RHSTy->isObjCClassType() && 3518 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3519 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast); 3520 return RHSTy; 3521 } 3522 // And the same for struct objc_object* / id 3523 if (LHSTy->isObjCIdType() && 3524 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3525 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3526 return LHSTy; 3527 } 3528 if (RHSTy->isObjCIdType() && 3529 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3530 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast); 3531 return RHSTy; 3532 } 3533 // Handle block pointer types. 3534 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3535 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3536 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3537 QualType destType = Context.getPointerType(Context.VoidTy); 3538 ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast); 3539 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3540 return destType; 3541 } 3542 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3543 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3544 return QualType(); 3545 } 3546 // We have 2 block pointer types. 3547 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3548 // Two identical block pointer types are always compatible. 3549 return LHSTy; 3550 } 3551 // The block pointer types aren't identical, continue checking. 3552 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3553 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3554 3555 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3556 rhptee.getUnqualifiedType())) { 3557 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3558 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3559 // In this situation, we assume void* type. No especially good 3560 // reason, but this is what gcc does, and we do have to pick 3561 // to get a consistent AST. 3562 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3563 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3564 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3565 return incompatTy; 3566 } 3567 // The block pointer types are compatible. 3568 ImpCastExprToType(LHS, LHSTy, CastExpr::CK_BitCast); 3569 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3570 return LHSTy; 3571 } 3572 // Check constraints for Objective-C object pointers types. 3573 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3574 3575 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3576 // Two identical object pointer types are always compatible. 3577 return LHSTy; 3578 } 3579 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>(); 3580 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>(); 3581 QualType compositeType = LHSTy; 3582 3583 // If both operands are interfaces and either operand can be 3584 // assigned to the other, use that type as the composite 3585 // type. This allows 3586 // xxx ? (A*) a : (B*) b 3587 // where B is a subclass of A. 3588 // 3589 // Additionally, as for assignment, if either type is 'id' 3590 // allow silent coercion. Finally, if the types are 3591 // incompatible then make sure to use 'id' as the composite 3592 // type so the result is acceptable for sending messages to. 3593 3594 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3595 // It could return the composite type. 3596 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3597 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3598 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3599 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3600 } else if ((LHSTy->isObjCQualifiedIdType() || 3601 RHSTy->isObjCQualifiedIdType()) && 3602 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3603 // Need to handle "id<xx>" explicitly. 3604 // GCC allows qualified id and any Objective-C type to devolve to 3605 // id. Currently localizing to here until clear this should be 3606 // part of ObjCQualifiedIdTypesAreCompatible. 3607 compositeType = Context.getObjCIdType(); 3608 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3609 compositeType = Context.getObjCIdType(); 3610 } else { 3611 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3612 << LHSTy << RHSTy 3613 << LHS->getSourceRange() << RHS->getSourceRange(); 3614 QualType incompatTy = Context.getObjCIdType(); 3615 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3616 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3617 return incompatTy; 3618 } 3619 // The object pointer types are compatible. 3620 ImpCastExprToType(LHS, compositeType, CastExpr::CK_BitCast); 3621 ImpCastExprToType(RHS, compositeType, CastExpr::CK_BitCast); 3622 return compositeType; 3623 } 3624 // Check Objective-C object pointer types and 'void *' 3625 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3626 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3627 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3628 QualType destPointee 3629 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3630 QualType destType = Context.getPointerType(destPointee); 3631 // Add qualifiers if necessary. 3632 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3633 // Promote to void*. 3634 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3635 return destType; 3636 } 3637 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3638 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3639 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3640 QualType destPointee 3641 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3642 QualType destType = Context.getPointerType(destPointee); 3643 // Add qualifiers if necessary. 3644 ImpCastExprToType(RHS, destType, CastExpr::CK_NoOp); 3645 // Promote to void*. 3646 ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast); 3647 return destType; 3648 } 3649 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3650 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3651 // get the "pointed to" types 3652 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3653 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3654 3655 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3656 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3657 // Figure out necessary qualifiers (C99 6.5.15p6) 3658 QualType destPointee 3659 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3660 QualType destType = Context.getPointerType(destPointee); 3661 // Add qualifiers if necessary. 3662 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3663 // Promote to void*. 3664 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3665 return destType; 3666 } 3667 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3668 QualType destPointee 3669 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3670 QualType destType = Context.getPointerType(destPointee); 3671 // Add qualifiers if necessary. 3672 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3673 // Promote to void*. 3674 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3675 return destType; 3676 } 3677 3678 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3679 // Two identical pointer types are always compatible. 3680 return LHSTy; 3681 } 3682 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3683 rhptee.getUnqualifiedType())) { 3684 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3685 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3686 // In this situation, we assume void* type. No especially good 3687 // reason, but this is what gcc does, and we do have to pick 3688 // to get a consistent AST. 3689 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3690 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3691 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3692 return incompatTy; 3693 } 3694 // The pointer types are compatible. 3695 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3696 // differently qualified versions of compatible types, the result type is 3697 // a pointer to an appropriately qualified version of the *composite* 3698 // type. 3699 // FIXME: Need to calculate the composite type. 3700 // FIXME: Need to add qualifiers 3701 ImpCastExprToType(LHS, LHSTy, CastExpr::CK_BitCast); 3702 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3703 return LHSTy; 3704 } 3705 3706 // GCC compatibility: soften pointer/integer mismatch. 3707 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3708 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3709 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3710 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_IntegralToPointer); 3711 return RHSTy; 3712 } 3713 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3714 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3715 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3716 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_IntegralToPointer); 3717 return LHSTy; 3718 } 3719 3720 // Otherwise, the operands are not compatible. 3721 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3722 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3723 return QualType(); 3724} 3725 3726/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3727/// in the case of a the GNU conditional expr extension. 3728Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3729 SourceLocation ColonLoc, 3730 ExprArg Cond, ExprArg LHS, 3731 ExprArg RHS) { 3732 Expr *CondExpr = (Expr *) Cond.get(); 3733 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3734 3735 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3736 // was the condition. 3737 bool isLHSNull = LHSExpr == 0; 3738 if (isLHSNull) 3739 LHSExpr = CondExpr; 3740 3741 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3742 RHSExpr, QuestionLoc); 3743 if (result.isNull()) 3744 return ExprError(); 3745 3746 Cond.release(); 3747 LHS.release(); 3748 RHS.release(); 3749 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3750 isLHSNull ? 0 : LHSExpr, 3751 ColonLoc, RHSExpr, result)); 3752} 3753 3754// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3755// being closely modeled after the C99 spec:-). The odd characteristic of this 3756// routine is it effectively iqnores the qualifiers on the top level pointee. 3757// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3758// FIXME: add a couple examples in this comment. 3759Sema::AssignConvertType 3760Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3761 QualType lhptee, rhptee; 3762 3763 if ((lhsType->isObjCClassType() && 3764 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3765 (rhsType->isObjCClassType() && 3766 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3767 return Compatible; 3768 } 3769 3770 // get the "pointed to" type (ignoring qualifiers at the top level) 3771 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3772 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3773 3774 // make sure we operate on the canonical type 3775 lhptee = Context.getCanonicalType(lhptee); 3776 rhptee = Context.getCanonicalType(rhptee); 3777 3778 AssignConvertType ConvTy = Compatible; 3779 3780 // C99 6.5.16.1p1: This following citation is common to constraints 3781 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3782 // qualifiers of the type *pointed to* by the right; 3783 // FIXME: Handle ExtQualType 3784 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3785 ConvTy = CompatiblePointerDiscardsQualifiers; 3786 3787 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3788 // incomplete type and the other is a pointer to a qualified or unqualified 3789 // version of void... 3790 if (lhptee->isVoidType()) { 3791 if (rhptee->isIncompleteOrObjectType()) 3792 return ConvTy; 3793 3794 // As an extension, we allow cast to/from void* to function pointer. 3795 assert(rhptee->isFunctionType()); 3796 return FunctionVoidPointer; 3797 } 3798 3799 if (rhptee->isVoidType()) { 3800 if (lhptee->isIncompleteOrObjectType()) 3801 return ConvTy; 3802 3803 // As an extension, we allow cast to/from void* to function pointer. 3804 assert(lhptee->isFunctionType()); 3805 return FunctionVoidPointer; 3806 } 3807 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3808 // unqualified versions of compatible types, ... 3809 lhptee = lhptee.getUnqualifiedType(); 3810 rhptee = rhptee.getUnqualifiedType(); 3811 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3812 // Check if the pointee types are compatible ignoring the sign. 3813 // We explicitly check for char so that we catch "char" vs 3814 // "unsigned char" on systems where "char" is unsigned. 3815 if (lhptee->isCharType()) 3816 lhptee = Context.UnsignedCharTy; 3817 else if (lhptee->isSignedIntegerType()) 3818 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3819 3820 if (rhptee->isCharType()) 3821 rhptee = Context.UnsignedCharTy; 3822 else if (rhptee->isSignedIntegerType()) 3823 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3824 3825 if (lhptee == rhptee) { 3826 // Types are compatible ignoring the sign. Qualifier incompatibility 3827 // takes priority over sign incompatibility because the sign 3828 // warning can be disabled. 3829 if (ConvTy != Compatible) 3830 return ConvTy; 3831 return IncompatiblePointerSign; 3832 } 3833 // General pointer incompatibility takes priority over qualifiers. 3834 return IncompatiblePointer; 3835 } 3836 return ConvTy; 3837} 3838 3839/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3840/// block pointer types are compatible or whether a block and normal pointer 3841/// are compatible. It is more restrict than comparing two function pointer 3842// types. 3843Sema::AssignConvertType 3844Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3845 QualType rhsType) { 3846 QualType lhptee, rhptee; 3847 3848 // get the "pointed to" type (ignoring qualifiers at the top level) 3849 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3850 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3851 3852 // make sure we operate on the canonical type 3853 lhptee = Context.getCanonicalType(lhptee); 3854 rhptee = Context.getCanonicalType(rhptee); 3855 3856 AssignConvertType ConvTy = Compatible; 3857 3858 // For blocks we enforce that qualifiers are identical. 3859 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3860 ConvTy = CompatiblePointerDiscardsQualifiers; 3861 3862 if (!Context.typesAreCompatible(lhptee, rhptee)) 3863 return IncompatibleBlockPointer; 3864 return ConvTy; 3865} 3866 3867/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3868/// has code to accommodate several GCC extensions when type checking 3869/// pointers. Here are some objectionable examples that GCC considers warnings: 3870/// 3871/// int a, *pint; 3872/// short *pshort; 3873/// struct foo *pfoo; 3874/// 3875/// pint = pshort; // warning: assignment from incompatible pointer type 3876/// a = pint; // warning: assignment makes integer from pointer without a cast 3877/// pint = a; // warning: assignment makes pointer from integer without a cast 3878/// pint = pfoo; // warning: assignment from incompatible pointer type 3879/// 3880/// As a result, the code for dealing with pointers is more complex than the 3881/// C99 spec dictates. 3882/// 3883Sema::AssignConvertType 3884Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3885 // Get canonical types. We're not formatting these types, just comparing 3886 // them. 3887 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3888 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3889 3890 if (lhsType == rhsType) 3891 return Compatible; // Common case: fast path an exact match. 3892 3893 if ((lhsType->isObjCClassType() && 3894 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3895 (rhsType->isObjCClassType() && 3896 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3897 return Compatible; 3898 } 3899 3900 // If the left-hand side is a reference type, then we are in a 3901 // (rare!) case where we've allowed the use of references in C, 3902 // e.g., as a parameter type in a built-in function. In this case, 3903 // just make sure that the type referenced is compatible with the 3904 // right-hand side type. The caller is responsible for adjusting 3905 // lhsType so that the resulting expression does not have reference 3906 // type. 3907 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3908 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3909 return Compatible; 3910 return Incompatible; 3911 } 3912 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3913 // to the same ExtVector type. 3914 if (lhsType->isExtVectorType()) { 3915 if (rhsType->isExtVectorType()) 3916 return lhsType == rhsType ? Compatible : Incompatible; 3917 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3918 return Compatible; 3919 } 3920 3921 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3922 // If we are allowing lax vector conversions, and LHS and RHS are both 3923 // vectors, the total size only needs to be the same. This is a bitcast; 3924 // no bits are changed but the result type is different. 3925 if (getLangOptions().LaxVectorConversions && 3926 lhsType->isVectorType() && rhsType->isVectorType()) { 3927 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3928 return IncompatibleVectors; 3929 } 3930 return Incompatible; 3931 } 3932 3933 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3934 return Compatible; 3935 3936 if (isa<PointerType>(lhsType)) { 3937 if (rhsType->isIntegerType()) 3938 return IntToPointer; 3939 3940 if (isa<PointerType>(rhsType)) 3941 return CheckPointerTypesForAssignment(lhsType, rhsType); 3942 3943 // In general, C pointers are not compatible with ObjC object pointers. 3944 if (isa<ObjCObjectPointerType>(rhsType)) { 3945 if (lhsType->isVoidPointerType()) // an exception to the rule. 3946 return Compatible; 3947 return IncompatiblePointer; 3948 } 3949 if (rhsType->getAs<BlockPointerType>()) { 3950 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3951 return Compatible; 3952 3953 // Treat block pointers as objects. 3954 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3955 return Compatible; 3956 } 3957 return Incompatible; 3958 } 3959 3960 if (isa<BlockPointerType>(lhsType)) { 3961 if (rhsType->isIntegerType()) 3962 return IntToBlockPointer; 3963 3964 // Treat block pointers as objects. 3965 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3966 return Compatible; 3967 3968 if (rhsType->isBlockPointerType()) 3969 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3970 3971 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3972 if (RHSPT->getPointeeType()->isVoidType()) 3973 return Compatible; 3974 } 3975 return Incompatible; 3976 } 3977 3978 if (isa<ObjCObjectPointerType>(lhsType)) { 3979 if (rhsType->isIntegerType()) 3980 return IntToPointer; 3981 3982 // In general, C pointers are not compatible with ObjC object pointers. 3983 if (isa<PointerType>(rhsType)) { 3984 if (rhsType->isVoidPointerType()) // an exception to the rule. 3985 return Compatible; 3986 return IncompatiblePointer; 3987 } 3988 if (rhsType->isObjCObjectPointerType()) { 3989 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3990 return Compatible; 3991 if (Context.typesAreCompatible(lhsType, rhsType)) 3992 return Compatible; 3993 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3994 return IncompatibleObjCQualifiedId; 3995 return IncompatiblePointer; 3996 } 3997 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3998 if (RHSPT->getPointeeType()->isVoidType()) 3999 return Compatible; 4000 } 4001 // Treat block pointers as objects. 4002 if (rhsType->isBlockPointerType()) 4003 return Compatible; 4004 return Incompatible; 4005 } 4006 if (isa<PointerType>(rhsType)) { 4007 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 4008 if (lhsType == Context.BoolTy) 4009 return Compatible; 4010 4011 if (lhsType->isIntegerType()) 4012 return PointerToInt; 4013 4014 if (isa<PointerType>(lhsType)) 4015 return CheckPointerTypesForAssignment(lhsType, rhsType); 4016 4017 if (isa<BlockPointerType>(lhsType) && 4018 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 4019 return Compatible; 4020 return Incompatible; 4021 } 4022 if (isa<ObjCObjectPointerType>(rhsType)) { 4023 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 4024 if (lhsType == Context.BoolTy) 4025 return Compatible; 4026 4027 if (lhsType->isIntegerType()) 4028 return PointerToInt; 4029 4030 // In general, C pointers are not compatible with ObjC object pointers. 4031 if (isa<PointerType>(lhsType)) { 4032 if (lhsType->isVoidPointerType()) // an exception to the rule. 4033 return Compatible; 4034 return IncompatiblePointer; 4035 } 4036 if (isa<BlockPointerType>(lhsType) && 4037 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 4038 return Compatible; 4039 return Incompatible; 4040 } 4041 4042 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 4043 if (Context.typesAreCompatible(lhsType, rhsType)) 4044 return Compatible; 4045 } 4046 return Incompatible; 4047} 4048 4049/// \brief Constructs a transparent union from an expression that is 4050/// used to initialize the transparent union. 4051static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 4052 QualType UnionType, FieldDecl *Field) { 4053 // Build an initializer list that designates the appropriate member 4054 // of the transparent union. 4055 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 4056 &E, 1, 4057 SourceLocation()); 4058 Initializer->setType(UnionType); 4059 Initializer->setInitializedFieldInUnion(Field); 4060 4061 // Build a compound literal constructing a value of the transparent 4062 // union type from this initializer list. 4063 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 4064 false); 4065} 4066 4067Sema::AssignConvertType 4068Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 4069 QualType FromType = rExpr->getType(); 4070 4071 // If the ArgType is a Union type, we want to handle a potential 4072 // transparent_union GCC extension. 4073 const RecordType *UT = ArgType->getAsUnionType(); 4074 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 4075 return Incompatible; 4076 4077 // The field to initialize within the transparent union. 4078 RecordDecl *UD = UT->getDecl(); 4079 FieldDecl *InitField = 0; 4080 // It's compatible if the expression matches any of the fields. 4081 for (RecordDecl::field_iterator it = UD->field_begin(), 4082 itend = UD->field_end(); 4083 it != itend; ++it) { 4084 if (it->getType()->isPointerType()) { 4085 // If the transparent union contains a pointer type, we allow: 4086 // 1) void pointer 4087 // 2) null pointer constant 4088 if (FromType->isPointerType()) 4089 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 4090 ImpCastExprToType(rExpr, it->getType(), CastExpr::CK_BitCast); 4091 InitField = *it; 4092 break; 4093 } 4094 4095 if (rExpr->isNullPointerConstant(Context, 4096 Expr::NPC_ValueDependentIsNull)) { 4097 ImpCastExprToType(rExpr, it->getType(), CastExpr::CK_IntegralToPointer); 4098 InitField = *it; 4099 break; 4100 } 4101 } 4102 4103 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 4104 == Compatible) { 4105 InitField = *it; 4106 break; 4107 } 4108 } 4109 4110 if (!InitField) 4111 return Incompatible; 4112 4113 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 4114 return Compatible; 4115} 4116 4117Sema::AssignConvertType 4118Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 4119 if (getLangOptions().CPlusPlus) { 4120 if (!lhsType->isRecordType()) { 4121 // C++ 5.17p3: If the left operand is not of class type, the 4122 // expression is implicitly converted (C++ 4) to the 4123 // cv-unqualified type of the left operand. 4124 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 4125 "assigning")) 4126 return Incompatible; 4127 return Compatible; 4128 } 4129 4130 // FIXME: Currently, we fall through and treat C++ classes like C 4131 // structures. 4132 } 4133 4134 // C99 6.5.16.1p1: the left operand is a pointer and the right is 4135 // a null pointer constant. 4136 if ((lhsType->isPointerType() || 4137 lhsType->isObjCObjectPointerType() || 4138 lhsType->isBlockPointerType()) 4139 && rExpr->isNullPointerConstant(Context, 4140 Expr::NPC_ValueDependentIsNull)) { 4141 ImpCastExprToType(rExpr, lhsType, CastExpr::CK_Unknown); 4142 return Compatible; 4143 } 4144 4145 // This check seems unnatural, however it is necessary to ensure the proper 4146 // conversion of functions/arrays. If the conversion were done for all 4147 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 4148 // expressions that surpress this implicit conversion (&, sizeof). 4149 // 4150 // Suppress this for references: C++ 8.5.3p5. 4151 if (!lhsType->isReferenceType()) 4152 DefaultFunctionArrayConversion(rExpr); 4153 4154 Sema::AssignConvertType result = 4155 CheckAssignmentConstraints(lhsType, rExpr->getType()); 4156 4157 // C99 6.5.16.1p2: The value of the right operand is converted to the 4158 // type of the assignment expression. 4159 // CheckAssignmentConstraints allows the left-hand side to be a reference, 4160 // so that we can use references in built-in functions even in C. 4161 // The getNonReferenceType() call makes sure that the resulting expression 4162 // does not have reference type. 4163 if (result != Incompatible && rExpr->getType() != lhsType) 4164 ImpCastExprToType(rExpr, lhsType.getNonReferenceType(), 4165 CastExpr::CK_Unknown); 4166 return result; 4167} 4168 4169QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 4170 Diag(Loc, diag::err_typecheck_invalid_operands) 4171 << lex->getType() << rex->getType() 4172 << lex->getSourceRange() << rex->getSourceRange(); 4173 return QualType(); 4174} 4175 4176inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 4177 Expr *&rex) { 4178 // For conversion purposes, we ignore any qualifiers. 4179 // For example, "const float" and "float" are equivalent. 4180 QualType lhsType = 4181 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 4182 QualType rhsType = 4183 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 4184 4185 // If the vector types are identical, return. 4186 if (lhsType == rhsType) 4187 return lhsType; 4188 4189 // Handle the case of a vector & extvector type of the same size and element 4190 // type. It would be nice if we only had one vector type someday. 4191 if (getLangOptions().LaxVectorConversions) { 4192 // FIXME: Should we warn here? 4193 if (const VectorType *LV = lhsType->getAs<VectorType>()) { 4194 if (const VectorType *RV = rhsType->getAs<VectorType>()) 4195 if (LV->getElementType() == RV->getElementType() && 4196 LV->getNumElements() == RV->getNumElements()) { 4197 return lhsType->isExtVectorType() ? lhsType : rhsType; 4198 } 4199 } 4200 } 4201 4202 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 4203 // swap back (so that we don't reverse the inputs to a subtract, for instance. 4204 bool swapped = false; 4205 if (rhsType->isExtVectorType()) { 4206 swapped = true; 4207 std::swap(rex, lex); 4208 std::swap(rhsType, lhsType); 4209 } 4210 4211 // Handle the case of an ext vector and scalar. 4212 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) { 4213 QualType EltTy = LV->getElementType(); 4214 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 4215 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 4216 ImpCastExprToType(rex, lhsType, CastExpr::CK_IntegralCast); 4217 if (swapped) std::swap(rex, lex); 4218 return lhsType; 4219 } 4220 } 4221 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 4222 rhsType->isRealFloatingType()) { 4223 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 4224 ImpCastExprToType(rex, lhsType, CastExpr::CK_FloatingCast); 4225 if (swapped) std::swap(rex, lex); 4226 return lhsType; 4227 } 4228 } 4229 } 4230 4231 // Vectors of different size or scalar and non-ext-vector are errors. 4232 Diag(Loc, diag::err_typecheck_vector_not_convertable) 4233 << lex->getType() << rex->getType() 4234 << lex->getSourceRange() << rex->getSourceRange(); 4235 return QualType(); 4236} 4237 4238inline QualType Sema::CheckMultiplyDivideOperands( 4239 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4240 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4241 return CheckVectorOperands(Loc, lex, rex); 4242 4243 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4244 4245 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4246 return compType; 4247 return InvalidOperands(Loc, lex, rex); 4248} 4249 4250inline QualType Sema::CheckRemainderOperands( 4251 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4252 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4253 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4254 return CheckVectorOperands(Loc, lex, rex); 4255 return InvalidOperands(Loc, lex, rex); 4256 } 4257 4258 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4259 4260 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4261 return compType; 4262 return InvalidOperands(Loc, lex, rex); 4263} 4264 4265inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4266 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) { 4267 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4268 QualType compType = CheckVectorOperands(Loc, lex, rex); 4269 if (CompLHSTy) *CompLHSTy = compType; 4270 return compType; 4271 } 4272 4273 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4274 4275 // handle the common case first (both operands are arithmetic). 4276 if (lex->getType()->isArithmeticType() && 4277 rex->getType()->isArithmeticType()) { 4278 if (CompLHSTy) *CompLHSTy = compType; 4279 return compType; 4280 } 4281 4282 // Put any potential pointer into PExp 4283 Expr* PExp = lex, *IExp = rex; 4284 if (IExp->getType()->isAnyPointerType()) 4285 std::swap(PExp, IExp); 4286 4287 if (PExp->getType()->isAnyPointerType()) { 4288 4289 if (IExp->getType()->isIntegerType()) { 4290 QualType PointeeTy = PExp->getType()->getPointeeType(); 4291 4292 // Check for arithmetic on pointers to incomplete types. 4293 if (PointeeTy->isVoidType()) { 4294 if (getLangOptions().CPlusPlus) { 4295 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4296 << lex->getSourceRange() << rex->getSourceRange(); 4297 return QualType(); 4298 } 4299 4300 // GNU extension: arithmetic on pointer to void 4301 Diag(Loc, diag::ext_gnu_void_ptr) 4302 << lex->getSourceRange() << rex->getSourceRange(); 4303 } else if (PointeeTy->isFunctionType()) { 4304 if (getLangOptions().CPlusPlus) { 4305 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4306 << lex->getType() << lex->getSourceRange(); 4307 return QualType(); 4308 } 4309 4310 // GNU extension: arithmetic on pointer to function 4311 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4312 << lex->getType() << lex->getSourceRange(); 4313 } else { 4314 // Check if we require a complete type. 4315 if (((PExp->getType()->isPointerType() && 4316 !PExp->getType()->isDependentType()) || 4317 PExp->getType()->isObjCObjectPointerType()) && 4318 RequireCompleteType(Loc, PointeeTy, 4319 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4320 << PExp->getSourceRange() 4321 << PExp->getType())) 4322 return QualType(); 4323 } 4324 // Diagnose bad cases where we step over interface counts. 4325 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4326 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4327 << PointeeTy << PExp->getSourceRange(); 4328 return QualType(); 4329 } 4330 4331 if (CompLHSTy) { 4332 QualType LHSTy = Context.isPromotableBitField(lex); 4333 if (LHSTy.isNull()) { 4334 LHSTy = lex->getType(); 4335 if (LHSTy->isPromotableIntegerType()) 4336 LHSTy = Context.getPromotedIntegerType(LHSTy); 4337 } 4338 *CompLHSTy = LHSTy; 4339 } 4340 return PExp->getType(); 4341 } 4342 } 4343 4344 return InvalidOperands(Loc, lex, rex); 4345} 4346 4347// C99 6.5.6 4348QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4349 SourceLocation Loc, QualType* CompLHSTy) { 4350 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4351 QualType compType = CheckVectorOperands(Loc, lex, rex); 4352 if (CompLHSTy) *CompLHSTy = compType; 4353 return compType; 4354 } 4355 4356 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4357 4358 // Enforce type constraints: C99 6.5.6p3. 4359 4360 // Handle the common case first (both operands are arithmetic). 4361 if (lex->getType()->isArithmeticType() 4362 && rex->getType()->isArithmeticType()) { 4363 if (CompLHSTy) *CompLHSTy = compType; 4364 return compType; 4365 } 4366 4367 // Either ptr - int or ptr - ptr. 4368 if (lex->getType()->isAnyPointerType()) { 4369 QualType lpointee = lex->getType()->getPointeeType(); 4370 4371 // The LHS must be an completely-defined object type. 4372 4373 bool ComplainAboutVoid = false; 4374 Expr *ComplainAboutFunc = 0; 4375 if (lpointee->isVoidType()) { 4376 if (getLangOptions().CPlusPlus) { 4377 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4378 << lex->getSourceRange() << rex->getSourceRange(); 4379 return QualType(); 4380 } 4381 4382 // GNU C extension: arithmetic on pointer to void 4383 ComplainAboutVoid = true; 4384 } else if (lpointee->isFunctionType()) { 4385 if (getLangOptions().CPlusPlus) { 4386 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4387 << lex->getType() << lex->getSourceRange(); 4388 return QualType(); 4389 } 4390 4391 // GNU C extension: arithmetic on pointer to function 4392 ComplainAboutFunc = lex; 4393 } else if (!lpointee->isDependentType() && 4394 RequireCompleteType(Loc, lpointee, 4395 PDiag(diag::err_typecheck_sub_ptr_object) 4396 << lex->getSourceRange() 4397 << lex->getType())) 4398 return QualType(); 4399 4400 // Diagnose bad cases where we step over interface counts. 4401 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4402 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4403 << lpointee << lex->getSourceRange(); 4404 return QualType(); 4405 } 4406 4407 // The result type of a pointer-int computation is the pointer type. 4408 if (rex->getType()->isIntegerType()) { 4409 if (ComplainAboutVoid) 4410 Diag(Loc, diag::ext_gnu_void_ptr) 4411 << lex->getSourceRange() << rex->getSourceRange(); 4412 if (ComplainAboutFunc) 4413 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4414 << ComplainAboutFunc->getType() 4415 << ComplainAboutFunc->getSourceRange(); 4416 4417 if (CompLHSTy) *CompLHSTy = lex->getType(); 4418 return lex->getType(); 4419 } 4420 4421 // Handle pointer-pointer subtractions. 4422 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4423 QualType rpointee = RHSPTy->getPointeeType(); 4424 4425 // RHS must be a completely-type object type. 4426 // Handle the GNU void* extension. 4427 if (rpointee->isVoidType()) { 4428 if (getLangOptions().CPlusPlus) { 4429 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4430 << lex->getSourceRange() << rex->getSourceRange(); 4431 return QualType(); 4432 } 4433 4434 ComplainAboutVoid = true; 4435 } else if (rpointee->isFunctionType()) { 4436 if (getLangOptions().CPlusPlus) { 4437 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4438 << rex->getType() << rex->getSourceRange(); 4439 return QualType(); 4440 } 4441 4442 // GNU extension: arithmetic on pointer to function 4443 if (!ComplainAboutFunc) 4444 ComplainAboutFunc = rex; 4445 } else if (!rpointee->isDependentType() && 4446 RequireCompleteType(Loc, rpointee, 4447 PDiag(diag::err_typecheck_sub_ptr_object) 4448 << rex->getSourceRange() 4449 << rex->getType())) 4450 return QualType(); 4451 4452 if (getLangOptions().CPlusPlus) { 4453 // Pointee types must be the same: C++ [expr.add] 4454 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4455 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4456 << lex->getType() << rex->getType() 4457 << lex->getSourceRange() << rex->getSourceRange(); 4458 return QualType(); 4459 } 4460 } else { 4461 // Pointee types must be compatible C99 6.5.6p3 4462 if (!Context.typesAreCompatible( 4463 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4464 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4465 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4466 << lex->getType() << rex->getType() 4467 << lex->getSourceRange() << rex->getSourceRange(); 4468 return QualType(); 4469 } 4470 } 4471 4472 if (ComplainAboutVoid) 4473 Diag(Loc, diag::ext_gnu_void_ptr) 4474 << lex->getSourceRange() << rex->getSourceRange(); 4475 if (ComplainAboutFunc) 4476 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4477 << ComplainAboutFunc->getType() 4478 << ComplainAboutFunc->getSourceRange(); 4479 4480 if (CompLHSTy) *CompLHSTy = lex->getType(); 4481 return Context.getPointerDiffType(); 4482 } 4483 } 4484 4485 return InvalidOperands(Loc, lex, rex); 4486} 4487 4488// C99 6.5.7 4489QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4490 bool isCompAssign) { 4491 // C99 6.5.7p2: Each of the operands shall have integer type. 4492 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4493 return InvalidOperands(Loc, lex, rex); 4494 4495 // Shifts don't perform usual arithmetic conversions, they just do integer 4496 // promotions on each operand. C99 6.5.7p3 4497 QualType LHSTy = Context.isPromotableBitField(lex); 4498 if (LHSTy.isNull()) { 4499 LHSTy = lex->getType(); 4500 if (LHSTy->isPromotableIntegerType()) 4501 LHSTy = Context.getPromotedIntegerType(LHSTy); 4502 } 4503 if (!isCompAssign) 4504 ImpCastExprToType(lex, LHSTy, CastExpr::CK_IntegralCast); 4505 4506 UsualUnaryConversions(rex); 4507 4508 // Sanity-check shift operands 4509 llvm::APSInt Right; 4510 // Check right/shifter operand 4511 if (!rex->isValueDependent() && 4512 rex->isIntegerConstantExpr(Right, Context)) { 4513 if (Right.isNegative()) 4514 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4515 else { 4516 llvm::APInt LeftBits(Right.getBitWidth(), 4517 Context.getTypeSize(lex->getType())); 4518 if (Right.uge(LeftBits)) 4519 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4520 } 4521 } 4522 4523 // "The type of the result is that of the promoted left operand." 4524 return LHSTy; 4525} 4526 4527// C99 6.5.8, C++ [expr.rel] 4528QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4529 unsigned OpaqueOpc, bool isRelational) { 4530 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4531 4532 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4533 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4534 4535 // C99 6.5.8p3 / C99 6.5.9p4 4536 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4537 UsualArithmeticConversions(lex, rex); 4538 else { 4539 UsualUnaryConversions(lex); 4540 UsualUnaryConversions(rex); 4541 } 4542 QualType lType = lex->getType(); 4543 QualType rType = rex->getType(); 4544 4545 if (!lType->isFloatingType() 4546 && !(lType->isBlockPointerType() && isRelational)) { 4547 // For non-floating point types, check for self-comparisons of the form 4548 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4549 // often indicate logic errors in the program. 4550 // NOTE: Don't warn about comparisons of enum constants. These can arise 4551 // from macro expansions, and are usually quite deliberate. 4552 Expr *LHSStripped = lex->IgnoreParens(); 4553 Expr *RHSStripped = rex->IgnoreParens(); 4554 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4555 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4556 if (DRL->getDecl() == DRR->getDecl() && 4557 !isa<EnumConstantDecl>(DRL->getDecl())) 4558 Diag(Loc, diag::warn_selfcomparison); 4559 4560 if (isa<CastExpr>(LHSStripped)) 4561 LHSStripped = LHSStripped->IgnoreParenCasts(); 4562 if (isa<CastExpr>(RHSStripped)) 4563 RHSStripped = RHSStripped->IgnoreParenCasts(); 4564 4565 // Warn about comparisons against a string constant (unless the other 4566 // operand is null), the user probably wants strcmp. 4567 Expr *literalString = 0; 4568 Expr *literalStringStripped = 0; 4569 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4570 !RHSStripped->isNullPointerConstant(Context, 4571 Expr::NPC_ValueDependentIsNull)) { 4572 literalString = lex; 4573 literalStringStripped = LHSStripped; 4574 } else if ((isa<StringLiteral>(RHSStripped) || 4575 isa<ObjCEncodeExpr>(RHSStripped)) && 4576 !LHSStripped->isNullPointerConstant(Context, 4577 Expr::NPC_ValueDependentIsNull)) { 4578 literalString = rex; 4579 literalStringStripped = RHSStripped; 4580 } 4581 4582 if (literalString) { 4583 std::string resultComparison; 4584 switch (Opc) { 4585 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4586 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4587 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4588 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4589 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4590 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4591 default: assert(false && "Invalid comparison operator"); 4592 } 4593 Diag(Loc, diag::warn_stringcompare) 4594 << isa<ObjCEncodeExpr>(literalStringStripped) 4595 << literalString->getSourceRange() 4596 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4597 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4598 "strcmp(") 4599 << CodeModificationHint::CreateInsertion( 4600 PP.getLocForEndOfToken(rex->getLocEnd()), 4601 resultComparison); 4602 } 4603 } 4604 4605 // The result of comparisons is 'bool' in C++, 'int' in C. 4606 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4607 4608 if (isRelational) { 4609 if (lType->isRealType() && rType->isRealType()) 4610 return ResultTy; 4611 } else { 4612 // Check for comparisons of floating point operands using != and ==. 4613 if (lType->isFloatingType()) { 4614 assert(rType->isFloatingType()); 4615 CheckFloatComparison(Loc,lex,rex); 4616 } 4617 4618 if (lType->isArithmeticType() && rType->isArithmeticType()) 4619 return ResultTy; 4620 } 4621 4622 bool LHSIsNull = lex->isNullPointerConstant(Context, 4623 Expr::NPC_ValueDependentIsNull); 4624 bool RHSIsNull = rex->isNullPointerConstant(Context, 4625 Expr::NPC_ValueDependentIsNull); 4626 4627 // All of the following pointer related warnings are GCC extensions, except 4628 // when handling null pointer constants. One day, we can consider making them 4629 // errors (when -pedantic-errors is enabled). 4630 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4631 QualType LCanPointeeTy = 4632 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4633 QualType RCanPointeeTy = 4634 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4635 4636 if (getLangOptions().CPlusPlus) { 4637 if (LCanPointeeTy == RCanPointeeTy) 4638 return ResultTy; 4639 4640 // C++ [expr.rel]p2: 4641 // [...] Pointer conversions (4.10) and qualification 4642 // conversions (4.4) are performed on pointer operands (or on 4643 // a pointer operand and a null pointer constant) to bring 4644 // them to their composite pointer type. [...] 4645 // 4646 // C++ [expr.eq]p1 uses the same notion for (in)equality 4647 // comparisons of pointers. 4648 QualType T = FindCompositePointerType(lex, rex); 4649 if (T.isNull()) { 4650 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4651 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4652 return QualType(); 4653 } 4654 4655 ImpCastExprToType(lex, T, CastExpr::CK_BitCast); 4656 ImpCastExprToType(rex, T, CastExpr::CK_BitCast); 4657 return ResultTy; 4658 } 4659 // C99 6.5.9p2 and C99 6.5.8p2 4660 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4661 RCanPointeeTy.getUnqualifiedType())) { 4662 // Valid unless a relational comparison of function pointers 4663 if (isRelational && LCanPointeeTy->isFunctionType()) { 4664 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4665 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4666 } 4667 } else if (!isRelational && 4668 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4669 // Valid unless comparison between non-null pointer and function pointer 4670 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4671 && !LHSIsNull && !RHSIsNull) { 4672 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4673 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4674 } 4675 } else { 4676 // Invalid 4677 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4678 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4679 } 4680 if (LCanPointeeTy != RCanPointeeTy) 4681 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4682 return ResultTy; 4683 } 4684 4685 if (getLangOptions().CPlusPlus) { 4686 // Comparison of pointers with null pointer constants and equality 4687 // comparisons of member pointers to null pointer constants. 4688 if (RHSIsNull && 4689 (lType->isPointerType() || 4690 (!isRelational && lType->isMemberPointerType()))) { 4691 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4692 return ResultTy; 4693 } 4694 if (LHSIsNull && 4695 (rType->isPointerType() || 4696 (!isRelational && rType->isMemberPointerType()))) { 4697 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4698 return ResultTy; 4699 } 4700 4701 // Comparison of member pointers. 4702 if (!isRelational && 4703 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4704 // C++ [expr.eq]p2: 4705 // In addition, pointers to members can be compared, or a pointer to 4706 // member and a null pointer constant. Pointer to member conversions 4707 // (4.11) and qualification conversions (4.4) are performed to bring 4708 // them to a common type. If one operand is a null pointer constant, 4709 // the common type is the type of the other operand. Otherwise, the 4710 // common type is a pointer to member type similar (4.4) to the type 4711 // of one of the operands, with a cv-qualification signature (4.4) 4712 // that is the union of the cv-qualification signatures of the operand 4713 // types. 4714 QualType T = FindCompositePointerType(lex, rex); 4715 if (T.isNull()) { 4716 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4717 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4718 return QualType(); 4719 } 4720 4721 ImpCastExprToType(lex, T, CastExpr::CK_BitCast); 4722 ImpCastExprToType(rex, T, CastExpr::CK_BitCast); 4723 return ResultTy; 4724 } 4725 4726 // Comparison of nullptr_t with itself. 4727 if (lType->isNullPtrType() && rType->isNullPtrType()) 4728 return ResultTy; 4729 } 4730 4731 // Handle block pointer types. 4732 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4733 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4734 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4735 4736 if (!LHSIsNull && !RHSIsNull && 4737 !Context.typesAreCompatible(lpointee, rpointee)) { 4738 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4739 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4740 } 4741 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4742 return ResultTy; 4743 } 4744 // Allow block pointers to be compared with null pointer constants. 4745 if (!isRelational 4746 && ((lType->isBlockPointerType() && rType->isPointerType()) 4747 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4748 if (!LHSIsNull && !RHSIsNull) { 4749 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4750 ->getPointeeType()->isVoidType()) 4751 || (lType->isPointerType() && lType->getAs<PointerType>() 4752 ->getPointeeType()->isVoidType()))) 4753 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4754 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4755 } 4756 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4757 return ResultTy; 4758 } 4759 4760 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4761 if (lType->isPointerType() || rType->isPointerType()) { 4762 const PointerType *LPT = lType->getAs<PointerType>(); 4763 const PointerType *RPT = rType->getAs<PointerType>(); 4764 bool LPtrToVoid = LPT ? 4765 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4766 bool RPtrToVoid = RPT ? 4767 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4768 4769 if (!LPtrToVoid && !RPtrToVoid && 4770 !Context.typesAreCompatible(lType, rType)) { 4771 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4772 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4773 } 4774 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4775 return ResultTy; 4776 } 4777 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4778 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4779 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4780 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4781 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4782 return ResultTy; 4783 } 4784 } 4785 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4786 unsigned DiagID = 0; 4787 if (RHSIsNull) { 4788 if (isRelational) 4789 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4790 } else if (isRelational) 4791 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4792 else 4793 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4794 4795 if (DiagID) { 4796 Diag(Loc, DiagID) 4797 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4798 } 4799 ImpCastExprToType(rex, lType, CastExpr::CK_IntegralToPointer); 4800 return ResultTy; 4801 } 4802 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4803 unsigned DiagID = 0; 4804 if (LHSIsNull) { 4805 if (isRelational) 4806 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4807 } else if (isRelational) 4808 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4809 else 4810 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4811 4812 if (DiagID) { 4813 Diag(Loc, DiagID) 4814 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4815 } 4816 ImpCastExprToType(lex, rType, CastExpr::CK_IntegralToPointer); 4817 return ResultTy; 4818 } 4819 // Handle block pointers. 4820 if (!isRelational && RHSIsNull 4821 && lType->isBlockPointerType() && rType->isIntegerType()) { 4822 ImpCastExprToType(rex, lType, CastExpr::CK_IntegralToPointer); 4823 return ResultTy; 4824 } 4825 if (!isRelational && LHSIsNull 4826 && lType->isIntegerType() && rType->isBlockPointerType()) { 4827 ImpCastExprToType(lex, rType, CastExpr::CK_IntegralToPointer); 4828 return ResultTy; 4829 } 4830 return InvalidOperands(Loc, lex, rex); 4831} 4832 4833/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4834/// operates on extended vector types. Instead of producing an IntTy result, 4835/// like a scalar comparison, a vector comparison produces a vector of integer 4836/// types. 4837QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4838 SourceLocation Loc, 4839 bool isRelational) { 4840 // Check to make sure we're operating on vectors of the same type and width, 4841 // Allowing one side to be a scalar of element type. 4842 QualType vType = CheckVectorOperands(Loc, lex, rex); 4843 if (vType.isNull()) 4844 return vType; 4845 4846 QualType lType = lex->getType(); 4847 QualType rType = rex->getType(); 4848 4849 // For non-floating point types, check for self-comparisons of the form 4850 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4851 // often indicate logic errors in the program. 4852 if (!lType->isFloatingType()) { 4853 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4854 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4855 if (DRL->getDecl() == DRR->getDecl()) 4856 Diag(Loc, diag::warn_selfcomparison); 4857 } 4858 4859 // Check for comparisons of floating point operands using != and ==. 4860 if (!isRelational && lType->isFloatingType()) { 4861 assert (rType->isFloatingType()); 4862 CheckFloatComparison(Loc,lex,rex); 4863 } 4864 4865 // Return the type for the comparison, which is the same as vector type for 4866 // integer vectors, or an integer type of identical size and number of 4867 // elements for floating point vectors. 4868 if (lType->isIntegerType()) 4869 return lType; 4870 4871 const VectorType *VTy = lType->getAs<VectorType>(); 4872 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4873 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4874 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4875 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4876 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4877 4878 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4879 "Unhandled vector element size in vector compare"); 4880 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4881} 4882 4883inline QualType Sema::CheckBitwiseOperands( 4884 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4885 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4886 return CheckVectorOperands(Loc, lex, rex); 4887 4888 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4889 4890 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4891 return compType; 4892 return InvalidOperands(Loc, lex, rex); 4893} 4894 4895inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4896 Expr *&lex, Expr *&rex, SourceLocation Loc) { 4897 UsualUnaryConversions(lex); 4898 UsualUnaryConversions(rex); 4899 4900 if (!lex->getType()->isScalarType() || !rex->getType()->isScalarType()) 4901 return InvalidOperands(Loc, lex, rex); 4902 4903 if (Context.getLangOptions().CPlusPlus) { 4904 // C++ [expr.log.and]p2 4905 // C++ [expr.log.or]p2 4906 return Context.BoolTy; 4907 } 4908 4909 return Context.IntTy; 4910} 4911 4912/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4913/// is a read-only property; return true if so. A readonly property expression 4914/// depends on various declarations and thus must be treated specially. 4915/// 4916static bool IsReadonlyProperty(Expr *E, Sema &S) { 4917 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4918 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4919 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4920 QualType BaseType = PropExpr->getBase()->getType(); 4921 if (const ObjCObjectPointerType *OPT = 4922 BaseType->getAsObjCInterfacePointerType()) 4923 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4924 if (S.isPropertyReadonly(PDecl, IFace)) 4925 return true; 4926 } 4927 } 4928 return false; 4929} 4930 4931/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4932/// emit an error and return true. If so, return false. 4933static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4934 SourceLocation OrigLoc = Loc; 4935 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4936 &Loc); 4937 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4938 IsLV = Expr::MLV_ReadonlyProperty; 4939 if (IsLV == Expr::MLV_Valid) 4940 return false; 4941 4942 unsigned Diag = 0; 4943 bool NeedType = false; 4944 switch (IsLV) { // C99 6.5.16p2 4945 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4946 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4947 case Expr::MLV_ArrayType: 4948 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4949 NeedType = true; 4950 break; 4951 case Expr::MLV_NotObjectType: 4952 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4953 NeedType = true; 4954 break; 4955 case Expr::MLV_LValueCast: 4956 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4957 break; 4958 case Expr::MLV_InvalidExpression: 4959 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4960 break; 4961 case Expr::MLV_IncompleteType: 4962 case Expr::MLV_IncompleteVoidType: 4963 return S.RequireCompleteType(Loc, E->getType(), 4964 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4965 << E->getSourceRange()); 4966 case Expr::MLV_DuplicateVectorComponents: 4967 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4968 break; 4969 case Expr::MLV_NotBlockQualified: 4970 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4971 break; 4972 case Expr::MLV_ReadonlyProperty: 4973 Diag = diag::error_readonly_property_assignment; 4974 break; 4975 case Expr::MLV_NoSetterProperty: 4976 Diag = diag::error_nosetter_property_assignment; 4977 break; 4978 } 4979 4980 SourceRange Assign; 4981 if (Loc != OrigLoc) 4982 Assign = SourceRange(OrigLoc, OrigLoc); 4983 if (NeedType) 4984 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4985 else 4986 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4987 return true; 4988} 4989 4990 4991 4992// C99 6.5.16.1 4993QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4994 SourceLocation Loc, 4995 QualType CompoundType) { 4996 // Verify that LHS is a modifiable lvalue, and emit error if not. 4997 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4998 return QualType(); 4999 5000 QualType LHSType = LHS->getType(); 5001 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 5002 5003 AssignConvertType ConvTy; 5004 if (CompoundType.isNull()) { 5005 // Simple assignment "x = y". 5006 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 5007 // Special case of NSObject attributes on c-style pointer types. 5008 if (ConvTy == IncompatiblePointer && 5009 ((Context.isObjCNSObjectType(LHSType) && 5010 RHSType->isObjCObjectPointerType()) || 5011 (Context.isObjCNSObjectType(RHSType) && 5012 LHSType->isObjCObjectPointerType()))) 5013 ConvTy = Compatible; 5014 5015 // If the RHS is a unary plus or minus, check to see if they = and + are 5016 // right next to each other. If so, the user may have typo'd "x =+ 4" 5017 // instead of "x += 4". 5018 Expr *RHSCheck = RHS; 5019 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 5020 RHSCheck = ICE->getSubExpr(); 5021 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 5022 if ((UO->getOpcode() == UnaryOperator::Plus || 5023 UO->getOpcode() == UnaryOperator::Minus) && 5024 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 5025 // Only if the two operators are exactly adjacent. 5026 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 5027 // And there is a space or other character before the subexpr of the 5028 // unary +/-. We don't want to warn on "x=-1". 5029 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 5030 UO->getSubExpr()->getLocStart().isFileID()) { 5031 Diag(Loc, diag::warn_not_compound_assign) 5032 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 5033 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 5034 } 5035 } 5036 } else { 5037 // Compound assignment "x += y" 5038 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 5039 } 5040 5041 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 5042 RHS, "assigning")) 5043 return QualType(); 5044 5045 // C99 6.5.16p3: The type of an assignment expression is the type of the 5046 // left operand unless the left operand has qualified type, in which case 5047 // it is the unqualified version of the type of the left operand. 5048 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 5049 // is converted to the type of the assignment expression (above). 5050 // C++ 5.17p1: the type of the assignment expression is that of its left 5051 // operand. 5052 return LHSType.getUnqualifiedType(); 5053} 5054 5055// C99 6.5.17 5056QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 5057 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 5058 DefaultFunctionArrayConversion(RHS); 5059 5060 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 5061 // incomplete in C++). 5062 5063 return RHS->getType(); 5064} 5065 5066/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 5067/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 5068QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 5069 bool isInc) { 5070 if (Op->isTypeDependent()) 5071 return Context.DependentTy; 5072 5073 QualType ResType = Op->getType(); 5074 assert(!ResType.isNull() && "no type for increment/decrement expression"); 5075 5076 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 5077 // Decrement of bool is not allowed. 5078 if (!isInc) { 5079 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 5080 return QualType(); 5081 } 5082 // Increment of bool sets it to true, but is deprecated. 5083 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 5084 } else if (ResType->isRealType()) { 5085 // OK! 5086 } else if (ResType->isAnyPointerType()) { 5087 QualType PointeeTy = ResType->getPointeeType(); 5088 5089 // C99 6.5.2.4p2, 6.5.6p2 5090 if (PointeeTy->isVoidType()) { 5091 if (getLangOptions().CPlusPlus) { 5092 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 5093 << Op->getSourceRange(); 5094 return QualType(); 5095 } 5096 5097 // Pointer to void is a GNU extension in C. 5098 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 5099 } else if (PointeeTy->isFunctionType()) { 5100 if (getLangOptions().CPlusPlus) { 5101 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 5102 << Op->getType() << Op->getSourceRange(); 5103 return QualType(); 5104 } 5105 5106 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 5107 << ResType << Op->getSourceRange(); 5108 } else if (RequireCompleteType(OpLoc, PointeeTy, 5109 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 5110 << Op->getSourceRange() 5111 << ResType)) 5112 return QualType(); 5113 // Diagnose bad cases where we step over interface counts. 5114 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 5115 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 5116 << PointeeTy << Op->getSourceRange(); 5117 return QualType(); 5118 } 5119 } else if (ResType->isComplexType()) { 5120 // C99 does not support ++/-- on complex types, we allow as an extension. 5121 Diag(OpLoc, diag::ext_integer_increment_complex) 5122 << ResType << Op->getSourceRange(); 5123 } else { 5124 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 5125 << ResType << Op->getSourceRange(); 5126 return QualType(); 5127 } 5128 // At this point, we know we have a real, complex or pointer type. 5129 // Now make sure the operand is a modifiable lvalue. 5130 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 5131 return QualType(); 5132 return ResType; 5133} 5134 5135/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 5136/// This routine allows us to typecheck complex/recursive expressions 5137/// where the declaration is needed for type checking. We only need to 5138/// handle cases when the expression references a function designator 5139/// or is an lvalue. Here are some examples: 5140/// - &(x) => x 5141/// - &*****f => f for f a function designator. 5142/// - &s.xx => s 5143/// - &s.zz[1].yy -> s, if zz is an array 5144/// - *(x + 1) -> x, if x is an array 5145/// - &"123"[2] -> 0 5146/// - & __real__ x -> x 5147static NamedDecl *getPrimaryDecl(Expr *E) { 5148 switch (E->getStmtClass()) { 5149 case Stmt::DeclRefExprClass: 5150 case Stmt::QualifiedDeclRefExprClass: 5151 return cast<DeclRefExpr>(E)->getDecl(); 5152 case Stmt::MemberExprClass: 5153 // If this is an arrow operator, the address is an offset from 5154 // the base's value, so the object the base refers to is 5155 // irrelevant. 5156 if (cast<MemberExpr>(E)->isArrow()) 5157 return 0; 5158 // Otherwise, the expression refers to a part of the base 5159 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 5160 case Stmt::ArraySubscriptExprClass: { 5161 // FIXME: This code shouldn't be necessary! We should catch the implicit 5162 // promotion of register arrays earlier. 5163 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 5164 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 5165 if (ICE->getSubExpr()->getType()->isArrayType()) 5166 return getPrimaryDecl(ICE->getSubExpr()); 5167 } 5168 return 0; 5169 } 5170 case Stmt::UnaryOperatorClass: { 5171 UnaryOperator *UO = cast<UnaryOperator>(E); 5172 5173 switch(UO->getOpcode()) { 5174 case UnaryOperator::Real: 5175 case UnaryOperator::Imag: 5176 case UnaryOperator::Extension: 5177 return getPrimaryDecl(UO->getSubExpr()); 5178 default: 5179 return 0; 5180 } 5181 } 5182 case Stmt::ParenExprClass: 5183 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 5184 case Stmt::ImplicitCastExprClass: 5185 // If the result of an implicit cast is an l-value, we care about 5186 // the sub-expression; otherwise, the result here doesn't matter. 5187 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 5188 default: 5189 return 0; 5190 } 5191} 5192 5193/// CheckAddressOfOperand - The operand of & must be either a function 5194/// designator or an lvalue designating an object. If it is an lvalue, the 5195/// object cannot be declared with storage class register or be a bit field. 5196/// Note: The usual conversions are *not* applied to the operand of the & 5197/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 5198/// In C++, the operand might be an overloaded function name, in which case 5199/// we allow the '&' but retain the overloaded-function type. 5200QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 5201 // Make sure to ignore parentheses in subsequent checks 5202 op = op->IgnoreParens(); 5203 5204 if (op->isTypeDependent()) 5205 return Context.DependentTy; 5206 5207 if (getLangOptions().C99) { 5208 // Implement C99-only parts of addressof rules. 5209 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 5210 if (uOp->getOpcode() == UnaryOperator::Deref) 5211 // Per C99 6.5.3.2, the address of a deref always returns a valid result 5212 // (assuming the deref expression is valid). 5213 return uOp->getSubExpr()->getType(); 5214 } 5215 // Technically, there should be a check for array subscript 5216 // expressions here, but the result of one is always an lvalue anyway. 5217 } 5218 NamedDecl *dcl = getPrimaryDecl(op); 5219 Expr::isLvalueResult lval = op->isLvalue(Context); 5220 5221 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 5222 // C99 6.5.3.2p1 5223 // The operand must be either an l-value or a function designator 5224 if (!op->getType()->isFunctionType()) { 5225 // FIXME: emit more specific diag... 5226 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 5227 << op->getSourceRange(); 5228 return QualType(); 5229 } 5230 } else if (op->getBitField()) { // C99 6.5.3.2p1 5231 // The operand cannot be a bit-field 5232 Diag(OpLoc, diag::err_typecheck_address_of) 5233 << "bit-field" << op->getSourceRange(); 5234 return QualType(); 5235 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 5236 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 5237 // The operand cannot be an element of a vector 5238 Diag(OpLoc, diag::err_typecheck_address_of) 5239 << "vector element" << op->getSourceRange(); 5240 return QualType(); 5241 } else if (isa<ObjCPropertyRefExpr>(op)) { 5242 // cannot take address of a property expression. 5243 Diag(OpLoc, diag::err_typecheck_address_of) 5244 << "property expression" << op->getSourceRange(); 5245 return QualType(); 5246 } else if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(op)) { 5247 // FIXME: Can LHS ever be null here? 5248 if (!CheckAddressOfOperand(CO->getTrueExpr(), OpLoc).isNull()) 5249 return CheckAddressOfOperand(CO->getFalseExpr(), OpLoc); 5250 } else if (dcl) { // C99 6.5.3.2p1 5251 // We have an lvalue with a decl. Make sure the decl is not declared 5252 // with the register storage-class specifier. 5253 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 5254 if (vd->getStorageClass() == VarDecl::Register) { 5255 Diag(OpLoc, diag::err_typecheck_address_of) 5256 << "register variable" << op->getSourceRange(); 5257 return QualType(); 5258 } 5259 } else if (isa<OverloadedFunctionDecl>(dcl) || 5260 isa<FunctionTemplateDecl>(dcl)) { 5261 return Context.OverloadTy; 5262 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 5263 // Okay: we can take the address of a field. 5264 // Could be a pointer to member, though, if there is an explicit 5265 // scope qualifier for the class. 5266 if (isa<QualifiedDeclRefExpr>(op)) { 5267 DeclContext *Ctx = dcl->getDeclContext(); 5268 if (Ctx && Ctx->isRecord()) { 5269 if (FD->getType()->isReferenceType()) { 5270 Diag(OpLoc, 5271 diag::err_cannot_form_pointer_to_member_of_reference_type) 5272 << FD->getDeclName() << FD->getType(); 5273 return QualType(); 5274 } 5275 5276 return Context.getMemberPointerType(op->getType(), 5277 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5278 } 5279 } 5280 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5281 // Okay: we can take the address of a function. 5282 // As above. 5283 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 5284 return Context.getMemberPointerType(op->getType(), 5285 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5286 } else if (!isa<FunctionDecl>(dcl)) 5287 assert(0 && "Unknown/unexpected decl type"); 5288 } 5289 5290 if (lval == Expr::LV_IncompleteVoidType) { 5291 // Taking the address of a void variable is technically illegal, but we 5292 // allow it in cases which are otherwise valid. 5293 // Example: "extern void x; void* y = &x;". 5294 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5295 } 5296 5297 // If the operand has type "type", the result has type "pointer to type". 5298 return Context.getPointerType(op->getType()); 5299} 5300 5301QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5302 if (Op->isTypeDependent()) 5303 return Context.DependentTy; 5304 5305 UsualUnaryConversions(Op); 5306 QualType Ty = Op->getType(); 5307 5308 // Note that per both C89 and C99, this is always legal, even if ptype is an 5309 // incomplete type or void. It would be possible to warn about dereferencing 5310 // a void pointer, but it's completely well-defined, and such a warning is 5311 // unlikely to catch any mistakes. 5312 if (const PointerType *PT = Ty->getAs<PointerType>()) 5313 return PT->getPointeeType(); 5314 5315 if (const ObjCObjectPointerType *OPT = Ty->getAs<ObjCObjectPointerType>()) 5316 return OPT->getPointeeType(); 5317 5318 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5319 << Ty << Op->getSourceRange(); 5320 return QualType(); 5321} 5322 5323static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5324 tok::TokenKind Kind) { 5325 BinaryOperator::Opcode Opc; 5326 switch (Kind) { 5327 default: assert(0 && "Unknown binop!"); 5328 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5329 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5330 case tok::star: Opc = BinaryOperator::Mul; break; 5331 case tok::slash: Opc = BinaryOperator::Div; break; 5332 case tok::percent: Opc = BinaryOperator::Rem; break; 5333 case tok::plus: Opc = BinaryOperator::Add; break; 5334 case tok::minus: Opc = BinaryOperator::Sub; break; 5335 case tok::lessless: Opc = BinaryOperator::Shl; break; 5336 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5337 case tok::lessequal: Opc = BinaryOperator::LE; break; 5338 case tok::less: Opc = BinaryOperator::LT; break; 5339 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5340 case tok::greater: Opc = BinaryOperator::GT; break; 5341 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5342 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5343 case tok::amp: Opc = BinaryOperator::And; break; 5344 case tok::caret: Opc = BinaryOperator::Xor; break; 5345 case tok::pipe: Opc = BinaryOperator::Or; break; 5346 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5347 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5348 case tok::equal: Opc = BinaryOperator::Assign; break; 5349 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5350 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5351 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5352 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5353 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5354 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5355 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5356 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5357 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5358 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5359 case tok::comma: Opc = BinaryOperator::Comma; break; 5360 } 5361 return Opc; 5362} 5363 5364static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5365 tok::TokenKind Kind) { 5366 UnaryOperator::Opcode Opc; 5367 switch (Kind) { 5368 default: assert(0 && "Unknown unary op!"); 5369 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5370 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5371 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5372 case tok::star: Opc = UnaryOperator::Deref; break; 5373 case tok::plus: Opc = UnaryOperator::Plus; break; 5374 case tok::minus: Opc = UnaryOperator::Minus; break; 5375 case tok::tilde: Opc = UnaryOperator::Not; break; 5376 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5377 case tok::kw___real: Opc = UnaryOperator::Real; break; 5378 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5379 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5380 } 5381 return Opc; 5382} 5383 5384/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5385/// operator @p Opc at location @c TokLoc. This routine only supports 5386/// built-in operations; ActOnBinOp handles overloaded operators. 5387Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5388 unsigned Op, 5389 Expr *lhs, Expr *rhs) { 5390 QualType ResultTy; // Result type of the binary operator. 5391 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5392 // The following two variables are used for compound assignment operators 5393 QualType CompLHSTy; // Type of LHS after promotions for computation 5394 QualType CompResultTy; // Type of computation result 5395 5396 switch (Opc) { 5397 case BinaryOperator::Assign: 5398 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5399 break; 5400 case BinaryOperator::PtrMemD: 5401 case BinaryOperator::PtrMemI: 5402 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5403 Opc == BinaryOperator::PtrMemI); 5404 break; 5405 case BinaryOperator::Mul: 5406 case BinaryOperator::Div: 5407 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5408 break; 5409 case BinaryOperator::Rem: 5410 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5411 break; 5412 case BinaryOperator::Add: 5413 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5414 break; 5415 case BinaryOperator::Sub: 5416 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5417 break; 5418 case BinaryOperator::Shl: 5419 case BinaryOperator::Shr: 5420 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5421 break; 5422 case BinaryOperator::LE: 5423 case BinaryOperator::LT: 5424 case BinaryOperator::GE: 5425 case BinaryOperator::GT: 5426 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5427 break; 5428 case BinaryOperator::EQ: 5429 case BinaryOperator::NE: 5430 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5431 break; 5432 case BinaryOperator::And: 5433 case BinaryOperator::Xor: 5434 case BinaryOperator::Or: 5435 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5436 break; 5437 case BinaryOperator::LAnd: 5438 case BinaryOperator::LOr: 5439 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5440 break; 5441 case BinaryOperator::MulAssign: 5442 case BinaryOperator::DivAssign: 5443 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5444 CompLHSTy = CompResultTy; 5445 if (!CompResultTy.isNull()) 5446 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5447 break; 5448 case BinaryOperator::RemAssign: 5449 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5450 CompLHSTy = CompResultTy; 5451 if (!CompResultTy.isNull()) 5452 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5453 break; 5454 case BinaryOperator::AddAssign: 5455 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5456 if (!CompResultTy.isNull()) 5457 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5458 break; 5459 case BinaryOperator::SubAssign: 5460 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5461 if (!CompResultTy.isNull()) 5462 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5463 break; 5464 case BinaryOperator::ShlAssign: 5465 case BinaryOperator::ShrAssign: 5466 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5467 CompLHSTy = CompResultTy; 5468 if (!CompResultTy.isNull()) 5469 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5470 break; 5471 case BinaryOperator::AndAssign: 5472 case BinaryOperator::XorAssign: 5473 case BinaryOperator::OrAssign: 5474 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5475 CompLHSTy = CompResultTy; 5476 if (!CompResultTy.isNull()) 5477 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5478 break; 5479 case BinaryOperator::Comma: 5480 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5481 break; 5482 } 5483 if (ResultTy.isNull()) 5484 return ExprError(); 5485 if (CompResultTy.isNull()) 5486 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5487 else 5488 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5489 CompLHSTy, CompResultTy, 5490 OpLoc)); 5491} 5492 5493// Binary Operators. 'Tok' is the token for the operator. 5494Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5495 tok::TokenKind Kind, 5496 ExprArg LHS, ExprArg RHS) { 5497 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5498 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5499 5500 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5501 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5502 5503 if (getLangOptions().CPlusPlus && 5504 (lhs->getType()->isOverloadableType() || 5505 rhs->getType()->isOverloadableType())) { 5506 // Find all of the overloaded operators visible from this 5507 // point. We perform both an operator-name lookup from the local 5508 // scope and an argument-dependent lookup based on the types of 5509 // the arguments. 5510 FunctionSet Functions; 5511 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5512 if (OverOp != OO_None) { 5513 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5514 Functions); 5515 Expr *Args[2] = { lhs, rhs }; 5516 DeclarationName OpName 5517 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5518 ArgumentDependentLookup(OpName, Args, 2, Functions); 5519 } 5520 5521 // Build the (potentially-overloaded, potentially-dependent) 5522 // binary operation. 5523 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5524 } 5525 5526 // Build a built-in binary operation. 5527 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5528} 5529 5530Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5531 unsigned OpcIn, 5532 ExprArg InputArg) { 5533 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5534 5535 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5536 Expr *Input = (Expr *)InputArg.get(); 5537 QualType resultType; 5538 switch (Opc) { 5539 case UnaryOperator::OffsetOf: 5540 assert(false && "Invalid unary operator"); 5541 break; 5542 5543 case UnaryOperator::PreInc: 5544 case UnaryOperator::PreDec: 5545 case UnaryOperator::PostInc: 5546 case UnaryOperator::PostDec: 5547 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5548 Opc == UnaryOperator::PreInc || 5549 Opc == UnaryOperator::PostInc); 5550 break; 5551 case UnaryOperator::AddrOf: 5552 resultType = CheckAddressOfOperand(Input, OpLoc); 5553 break; 5554 case UnaryOperator::Deref: 5555 DefaultFunctionArrayConversion(Input); 5556 resultType = CheckIndirectionOperand(Input, OpLoc); 5557 break; 5558 case UnaryOperator::Plus: 5559 case UnaryOperator::Minus: 5560 UsualUnaryConversions(Input); 5561 resultType = Input->getType(); 5562 if (resultType->isDependentType()) 5563 break; 5564 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5565 break; 5566 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5567 resultType->isEnumeralType()) 5568 break; 5569 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5570 Opc == UnaryOperator::Plus && 5571 resultType->isPointerType()) 5572 break; 5573 5574 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5575 << resultType << Input->getSourceRange()); 5576 case UnaryOperator::Not: // bitwise complement 5577 UsualUnaryConversions(Input); 5578 resultType = Input->getType(); 5579 if (resultType->isDependentType()) 5580 break; 5581 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5582 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5583 // C99 does not support '~' for complex conjugation. 5584 Diag(OpLoc, diag::ext_integer_complement_complex) 5585 << resultType << Input->getSourceRange(); 5586 else if (!resultType->isIntegerType()) 5587 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5588 << resultType << Input->getSourceRange()); 5589 break; 5590 case UnaryOperator::LNot: // logical negation 5591 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5592 DefaultFunctionArrayConversion(Input); 5593 resultType = Input->getType(); 5594 if (resultType->isDependentType()) 5595 break; 5596 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5597 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5598 << resultType << Input->getSourceRange()); 5599 // LNot always has type int. C99 6.5.3.3p5. 5600 // In C++, it's bool. C++ 5.3.1p8 5601 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5602 break; 5603 case UnaryOperator::Real: 5604 case UnaryOperator::Imag: 5605 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5606 break; 5607 case UnaryOperator::Extension: 5608 resultType = Input->getType(); 5609 break; 5610 } 5611 if (resultType.isNull()) 5612 return ExprError(); 5613 5614 InputArg.release(); 5615 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5616} 5617 5618// Unary Operators. 'Tok' is the token for the operator. 5619Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5620 tok::TokenKind Op, ExprArg input) { 5621 Expr *Input = (Expr*)input.get(); 5622 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5623 5624 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5625 // Find all of the overloaded operators visible from this 5626 // point. We perform both an operator-name lookup from the local 5627 // scope and an argument-dependent lookup based on the types of 5628 // the arguments. 5629 FunctionSet Functions; 5630 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5631 if (OverOp != OO_None) { 5632 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5633 Functions); 5634 DeclarationName OpName 5635 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5636 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5637 } 5638 5639 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5640 } 5641 5642 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5643} 5644 5645/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5646Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5647 SourceLocation LabLoc, 5648 IdentifierInfo *LabelII) { 5649 // Look up the record for this label identifier. 5650 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5651 5652 // If we haven't seen this label yet, create a forward reference. It 5653 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5654 if (LabelDecl == 0) 5655 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5656 5657 // Create the AST node. The address of a label always has type 'void*'. 5658 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5659 Context.getPointerType(Context.VoidTy))); 5660} 5661 5662Sema::OwningExprResult 5663Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5664 SourceLocation RPLoc) { // "({..})" 5665 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5666 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5667 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5668 5669 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5670 if (isFileScope) 5671 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5672 5673 // FIXME: there are a variety of strange constraints to enforce here, for 5674 // example, it is not possible to goto into a stmt expression apparently. 5675 // More semantic analysis is needed. 5676 5677 // If there are sub stmts in the compound stmt, take the type of the last one 5678 // as the type of the stmtexpr. 5679 QualType Ty = Context.VoidTy; 5680 5681 if (!Compound->body_empty()) { 5682 Stmt *LastStmt = Compound->body_back(); 5683 // If LastStmt is a label, skip down through into the body. 5684 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5685 LastStmt = Label->getSubStmt(); 5686 5687 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5688 Ty = LastExpr->getType(); 5689 } 5690 5691 // FIXME: Check that expression type is complete/non-abstract; statement 5692 // expressions are not lvalues. 5693 5694 substmt.release(); 5695 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5696} 5697 5698Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5699 SourceLocation BuiltinLoc, 5700 SourceLocation TypeLoc, 5701 TypeTy *argty, 5702 OffsetOfComponent *CompPtr, 5703 unsigned NumComponents, 5704 SourceLocation RPLoc) { 5705 // FIXME: This function leaks all expressions in the offset components on 5706 // error. 5707 // FIXME: Preserve type source info. 5708 QualType ArgTy = GetTypeFromParser(argty); 5709 assert(!ArgTy.isNull() && "Missing type argument!"); 5710 5711 bool Dependent = ArgTy->isDependentType(); 5712 5713 // We must have at least one component that refers to the type, and the first 5714 // one is known to be a field designator. Verify that the ArgTy represents 5715 // a struct/union/class. 5716 if (!Dependent && !ArgTy->isRecordType()) 5717 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5718 5719 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5720 // with an incomplete type would be illegal. 5721 5722 // Otherwise, create a null pointer as the base, and iteratively process 5723 // the offsetof designators. 5724 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5725 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5726 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5727 ArgTy, SourceLocation()); 5728 5729 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5730 // GCC extension, diagnose them. 5731 // FIXME: This diagnostic isn't actually visible because the location is in 5732 // a system header! 5733 if (NumComponents != 1) 5734 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5735 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5736 5737 if (!Dependent) { 5738 bool DidWarnAboutNonPOD = false; 5739 5740 // FIXME: Dependent case loses a lot of information here. And probably 5741 // leaks like a sieve. 5742 for (unsigned i = 0; i != NumComponents; ++i) { 5743 const OffsetOfComponent &OC = CompPtr[i]; 5744 if (OC.isBrackets) { 5745 // Offset of an array sub-field. TODO: Should we allow vector elements? 5746 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5747 if (!AT) { 5748 Res->Destroy(Context); 5749 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5750 << Res->getType()); 5751 } 5752 5753 // FIXME: C++: Verify that operator[] isn't overloaded. 5754 5755 // Promote the array so it looks more like a normal array subscript 5756 // expression. 5757 DefaultFunctionArrayConversion(Res); 5758 5759 // C99 6.5.2.1p1 5760 Expr *Idx = static_cast<Expr*>(OC.U.E); 5761 // FIXME: Leaks Res 5762 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5763 return ExprError(Diag(Idx->getLocStart(), 5764 diag::err_typecheck_subscript_not_integer) 5765 << Idx->getSourceRange()); 5766 5767 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5768 OC.LocEnd); 5769 continue; 5770 } 5771 5772 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5773 if (!RC) { 5774 Res->Destroy(Context); 5775 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5776 << Res->getType()); 5777 } 5778 5779 // Get the decl corresponding to this. 5780 RecordDecl *RD = RC->getDecl(); 5781 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5782 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5783 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5784 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5785 << Res->getType()); 5786 DidWarnAboutNonPOD = true; 5787 } 5788 } 5789 5790 LookupResult R; 5791 LookupQualifiedName(R, RD, OC.U.IdentInfo, LookupMemberName); 5792 5793 FieldDecl *MemberDecl 5794 = dyn_cast_or_null<FieldDecl>(R.getAsSingleDecl(Context)); 5795 // FIXME: Leaks Res 5796 if (!MemberDecl) 5797 return ExprError(Diag(BuiltinLoc, diag::err_no_member) 5798 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart, OC.LocEnd)); 5799 5800 // FIXME: C++: Verify that MemberDecl isn't a static field. 5801 // FIXME: Verify that MemberDecl isn't a bitfield. 5802 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5803 Res = BuildAnonymousStructUnionMemberReference( 5804 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5805 } else { 5806 // MemberDecl->getType() doesn't get the right qualifiers, but it 5807 // doesn't matter here. 5808 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5809 MemberDecl->getType().getNonReferenceType()); 5810 } 5811 } 5812 } 5813 5814 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5815 Context.getSizeType(), BuiltinLoc)); 5816} 5817 5818 5819Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5820 TypeTy *arg1,TypeTy *arg2, 5821 SourceLocation RPLoc) { 5822 // FIXME: Preserve type source info. 5823 QualType argT1 = GetTypeFromParser(arg1); 5824 QualType argT2 = GetTypeFromParser(arg2); 5825 5826 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5827 5828 if (getLangOptions().CPlusPlus) { 5829 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5830 << SourceRange(BuiltinLoc, RPLoc); 5831 return ExprError(); 5832 } 5833 5834 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5835 argT1, argT2, RPLoc)); 5836} 5837 5838Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5839 ExprArg cond, 5840 ExprArg expr1, ExprArg expr2, 5841 SourceLocation RPLoc) { 5842 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5843 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5844 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5845 5846 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5847 5848 QualType resType; 5849 bool ValueDependent = false; 5850 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5851 resType = Context.DependentTy; 5852 ValueDependent = true; 5853 } else { 5854 // The conditional expression is required to be a constant expression. 5855 llvm::APSInt condEval(32); 5856 SourceLocation ExpLoc; 5857 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5858 return ExprError(Diag(ExpLoc, 5859 diag::err_typecheck_choose_expr_requires_constant) 5860 << CondExpr->getSourceRange()); 5861 5862 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5863 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5864 ValueDependent = condEval.getZExtValue() ? LHSExpr->isValueDependent() 5865 : RHSExpr->isValueDependent(); 5866 } 5867 5868 cond.release(); expr1.release(); expr2.release(); 5869 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5870 resType, RPLoc, 5871 resType->isDependentType(), 5872 ValueDependent)); 5873} 5874 5875//===----------------------------------------------------------------------===// 5876// Clang Extensions. 5877//===----------------------------------------------------------------------===// 5878 5879/// ActOnBlockStart - This callback is invoked when a block literal is started. 5880void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5881 // Analyze block parameters. 5882 BlockSemaInfo *BSI = new BlockSemaInfo(); 5883 5884 // Add BSI to CurBlock. 5885 BSI->PrevBlockInfo = CurBlock; 5886 CurBlock = BSI; 5887 5888 BSI->ReturnType = QualType(); 5889 BSI->TheScope = BlockScope; 5890 BSI->hasBlockDeclRefExprs = false; 5891 BSI->hasPrototype = false; 5892 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5893 CurFunctionNeedsScopeChecking = false; 5894 5895 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5896 PushDeclContext(BlockScope, BSI->TheDecl); 5897} 5898 5899void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5900 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5901 5902 if (ParamInfo.getNumTypeObjects() == 0 5903 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5904 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5905 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5906 5907 if (T->isArrayType()) { 5908 Diag(ParamInfo.getSourceRange().getBegin(), 5909 diag::err_block_returns_array); 5910 return; 5911 } 5912 5913 // The parameter list is optional, if there was none, assume (). 5914 if (!T->isFunctionType()) 5915 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5916 5917 CurBlock->hasPrototype = true; 5918 CurBlock->isVariadic = false; 5919 // Check for a valid sentinel attribute on this block. 5920 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5921 Diag(ParamInfo.getAttributes()->getLoc(), 5922 diag::warn_attribute_sentinel_not_variadic) << 1; 5923 // FIXME: remove the attribute. 5924 } 5925 QualType RetTy = T.getTypePtr()->getAs<FunctionType>()->getResultType(); 5926 5927 // Do not allow returning a objc interface by-value. 5928 if (RetTy->isObjCInterfaceType()) { 5929 Diag(ParamInfo.getSourceRange().getBegin(), 5930 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5931 return; 5932 } 5933 return; 5934 } 5935 5936 // Analyze arguments to block. 5937 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5938 "Not a function declarator!"); 5939 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5940 5941 CurBlock->hasPrototype = FTI.hasPrototype; 5942 CurBlock->isVariadic = true; 5943 5944 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5945 // no arguments, not a function that takes a single void argument. 5946 if (FTI.hasPrototype && 5947 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5948 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5949 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5950 // empty arg list, don't push any params. 5951 CurBlock->isVariadic = false; 5952 } else if (FTI.hasPrototype) { 5953 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5954 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5955 CurBlock->isVariadic = FTI.isVariadic; 5956 } 5957 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5958 CurBlock->Params.size()); 5959 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5960 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5961 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5962 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5963 // If this has an identifier, add it to the scope stack. 5964 if ((*AI)->getIdentifier()) 5965 PushOnScopeChains(*AI, CurBlock->TheScope); 5966 5967 // Check for a valid sentinel attribute on this block. 5968 if (!CurBlock->isVariadic && 5969 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5970 Diag(ParamInfo.getAttributes()->getLoc(), 5971 diag::warn_attribute_sentinel_not_variadic) << 1; 5972 // FIXME: remove the attribute. 5973 } 5974 5975 // Analyze the return type. 5976 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5977 QualType RetTy = T->getAs<FunctionType>()->getResultType(); 5978 5979 // Do not allow returning a objc interface by-value. 5980 if (RetTy->isObjCInterfaceType()) { 5981 Diag(ParamInfo.getSourceRange().getBegin(), 5982 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5983 } else if (!RetTy->isDependentType()) 5984 CurBlock->ReturnType = RetTy; 5985} 5986 5987/// ActOnBlockError - If there is an error parsing a block, this callback 5988/// is invoked to pop the information about the block from the action impl. 5989void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5990 // Ensure that CurBlock is deleted. 5991 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5992 5993 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5994 5995 // Pop off CurBlock, handle nested blocks. 5996 PopDeclContext(); 5997 CurBlock = CurBlock->PrevBlockInfo; 5998 // FIXME: Delete the ParmVarDecl objects as well??? 5999} 6000 6001/// ActOnBlockStmtExpr - This is called when the body of a block statement 6002/// literal was successfully completed. ^(int x){...} 6003Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 6004 StmtArg body, Scope *CurScope) { 6005 // If blocks are disabled, emit an error. 6006 if (!LangOpts.Blocks) 6007 Diag(CaretLoc, diag::err_blocks_disable); 6008 6009 // Ensure that CurBlock is deleted. 6010 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 6011 6012 PopDeclContext(); 6013 6014 // Pop off CurBlock, handle nested blocks. 6015 CurBlock = CurBlock->PrevBlockInfo; 6016 6017 QualType RetTy = Context.VoidTy; 6018 if (!BSI->ReturnType.isNull()) 6019 RetTy = BSI->ReturnType; 6020 6021 llvm::SmallVector<QualType, 8> ArgTypes; 6022 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 6023 ArgTypes.push_back(BSI->Params[i]->getType()); 6024 6025 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 6026 QualType BlockTy; 6027 if (!BSI->hasPrototype) 6028 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 6029 NoReturn); 6030 else 6031 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 6032 BSI->isVariadic, 0, false, false, 0, 0, 6033 NoReturn); 6034 6035 // FIXME: Check that return/parameter types are complete/non-abstract 6036 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 6037 BlockTy = Context.getBlockPointerType(BlockTy); 6038 6039 // If needed, diagnose invalid gotos and switches in the block. 6040 if (CurFunctionNeedsScopeChecking) 6041 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 6042 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 6043 6044 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 6045 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 6046 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 6047 BSI->hasBlockDeclRefExprs)); 6048} 6049 6050Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 6051 ExprArg expr, TypeTy *type, 6052 SourceLocation RPLoc) { 6053 QualType T = GetTypeFromParser(type); 6054 Expr *E = static_cast<Expr*>(expr.get()); 6055 Expr *OrigExpr = E; 6056 6057 InitBuiltinVaListType(); 6058 6059 // Get the va_list type 6060 QualType VaListType = Context.getBuiltinVaListType(); 6061 if (VaListType->isArrayType()) { 6062 // Deal with implicit array decay; for example, on x86-64, 6063 // va_list is an array, but it's supposed to decay to 6064 // a pointer for va_arg. 6065 VaListType = Context.getArrayDecayedType(VaListType); 6066 // Make sure the input expression also decays appropriately. 6067 UsualUnaryConversions(E); 6068 } else { 6069 // Otherwise, the va_list argument must be an l-value because 6070 // it is modified by va_arg. 6071 if (!E->isTypeDependent() && 6072 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 6073 return ExprError(); 6074 } 6075 6076 if (!E->isTypeDependent() && 6077 !Context.hasSameType(VaListType, E->getType())) { 6078 return ExprError(Diag(E->getLocStart(), 6079 diag::err_first_argument_to_va_arg_not_of_type_va_list) 6080 << OrigExpr->getType() << E->getSourceRange()); 6081 } 6082 6083 // FIXME: Check that type is complete/non-abstract 6084 // FIXME: Warn if a non-POD type is passed in. 6085 6086 expr.release(); 6087 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 6088 RPLoc)); 6089} 6090 6091Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 6092 // The type of __null will be int or long, depending on the size of 6093 // pointers on the target. 6094 QualType Ty; 6095 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 6096 Ty = Context.IntTy; 6097 else 6098 Ty = Context.LongTy; 6099 6100 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 6101} 6102 6103bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 6104 SourceLocation Loc, 6105 QualType DstType, QualType SrcType, 6106 Expr *SrcExpr, const char *Flavor) { 6107 // Decode the result (notice that AST's are still created for extensions). 6108 bool isInvalid = false; 6109 unsigned DiagKind; 6110 switch (ConvTy) { 6111 default: assert(0 && "Unknown conversion type"); 6112 case Compatible: return false; 6113 case PointerToInt: 6114 DiagKind = diag::ext_typecheck_convert_pointer_int; 6115 break; 6116 case IntToPointer: 6117 DiagKind = diag::ext_typecheck_convert_int_pointer; 6118 break; 6119 case IncompatiblePointer: 6120 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 6121 break; 6122 case IncompatiblePointerSign: 6123 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 6124 break; 6125 case FunctionVoidPointer: 6126 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 6127 break; 6128 case CompatiblePointerDiscardsQualifiers: 6129 // If the qualifiers lost were because we were applying the 6130 // (deprecated) C++ conversion from a string literal to a char* 6131 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 6132 // Ideally, this check would be performed in 6133 // CheckPointerTypesForAssignment. However, that would require a 6134 // bit of refactoring (so that the second argument is an 6135 // expression, rather than a type), which should be done as part 6136 // of a larger effort to fix CheckPointerTypesForAssignment for 6137 // C++ semantics. 6138 if (getLangOptions().CPlusPlus && 6139 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 6140 return false; 6141 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 6142 break; 6143 case IntToBlockPointer: 6144 DiagKind = diag::err_int_to_block_pointer; 6145 break; 6146 case IncompatibleBlockPointer: 6147 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 6148 break; 6149 case IncompatibleObjCQualifiedId: 6150 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 6151 // it can give a more specific diagnostic. 6152 DiagKind = diag::warn_incompatible_qualified_id; 6153 break; 6154 case IncompatibleVectors: 6155 DiagKind = diag::warn_incompatible_vectors; 6156 break; 6157 case Incompatible: 6158 DiagKind = diag::err_typecheck_convert_incompatible; 6159 isInvalid = true; 6160 break; 6161 } 6162 6163 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 6164 << SrcExpr->getSourceRange(); 6165 return isInvalid; 6166} 6167 6168bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 6169 llvm::APSInt ICEResult; 6170 if (E->isIntegerConstantExpr(ICEResult, Context)) { 6171 if (Result) 6172 *Result = ICEResult; 6173 return false; 6174 } 6175 6176 Expr::EvalResult EvalResult; 6177 6178 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 6179 EvalResult.HasSideEffects) { 6180 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 6181 6182 if (EvalResult.Diag) { 6183 // We only show the note if it's not the usual "invalid subexpression" 6184 // or if it's actually in a subexpression. 6185 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 6186 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 6187 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6188 } 6189 6190 return true; 6191 } 6192 6193 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 6194 E->getSourceRange(); 6195 6196 if (EvalResult.Diag && 6197 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 6198 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6199 6200 if (Result) 6201 *Result = EvalResult.Val.getInt(); 6202 return false; 6203} 6204 6205Sema::ExpressionEvaluationContext 6206Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 6207 // Introduce a new set of potentially referenced declarations to the stack. 6208 if (NewContext == PotentiallyPotentiallyEvaluated) 6209 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 6210 6211 std::swap(ExprEvalContext, NewContext); 6212 return NewContext; 6213} 6214 6215void 6216Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 6217 ExpressionEvaluationContext NewContext) { 6218 ExprEvalContext = NewContext; 6219 6220 if (OldContext == PotentiallyPotentiallyEvaluated) { 6221 // Mark any remaining declarations in the current position of the stack 6222 // as "referenced". If they were not meant to be referenced, semantic 6223 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 6224 PotentiallyReferencedDecls RemainingDecls; 6225 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 6226 PotentiallyReferencedDeclStack.pop_back(); 6227 6228 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 6229 IEnd = RemainingDecls.end(); 6230 I != IEnd; ++I) 6231 MarkDeclarationReferenced(I->first, I->second); 6232 } 6233} 6234 6235/// \brief Note that the given declaration was referenced in the source code. 6236/// 6237/// This routine should be invoke whenever a given declaration is referenced 6238/// in the source code, and where that reference occurred. If this declaration 6239/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 6240/// C99 6.9p3), then the declaration will be marked as used. 6241/// 6242/// \param Loc the location where the declaration was referenced. 6243/// 6244/// \param D the declaration that has been referenced by the source code. 6245void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 6246 assert(D && "No declaration?"); 6247 6248 if (D->isUsed()) 6249 return; 6250 6251 // Mark a parameter or variable declaration "used", regardless of whether we're in a 6252 // template or not. The reason for this is that unevaluated expressions 6253 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and 6254 // -Wunused-parameters) 6255 if (isa<ParmVarDecl>(D) || 6256 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) 6257 D->setUsed(true); 6258 6259 // Do not mark anything as "used" within a dependent context; wait for 6260 // an instantiation. 6261 if (CurContext->isDependentContext()) 6262 return; 6263 6264 switch (ExprEvalContext) { 6265 case Unevaluated: 6266 // We are in an expression that is not potentially evaluated; do nothing. 6267 return; 6268 6269 case PotentiallyEvaluated: 6270 // We are in a potentially-evaluated expression, so this declaration is 6271 // "used"; handle this below. 6272 break; 6273 6274 case PotentiallyPotentiallyEvaluated: 6275 // We are in an expression that may be potentially evaluated; queue this 6276 // declaration reference until we know whether the expression is 6277 // potentially evaluated. 6278 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6279 return; 6280 } 6281 6282 // Note that this declaration has been used. 6283 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6284 unsigned TypeQuals; 6285 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6286 if (!Constructor->isUsed()) 6287 DefineImplicitDefaultConstructor(Loc, Constructor); 6288 } else if (Constructor->isImplicit() && 6289 Constructor->isCopyConstructor(Context, TypeQuals)) { 6290 if (!Constructor->isUsed()) 6291 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6292 } 6293 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6294 if (Destructor->isImplicit() && !Destructor->isUsed()) 6295 DefineImplicitDestructor(Loc, Destructor); 6296 6297 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6298 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6299 MethodDecl->getOverloadedOperator() == OO_Equal) { 6300 if (!MethodDecl->isUsed()) 6301 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6302 } 6303 } 6304 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6305 // Implicit instantiation of function templates and member functions of 6306 // class templates. 6307 if (!Function->getBody() && 6308 Function->getTemplateSpecializationKind() 6309 == TSK_ImplicitInstantiation) { 6310 bool AlreadyInstantiated = false; 6311 if (FunctionTemplateSpecializationInfo *SpecInfo 6312 = Function->getTemplateSpecializationInfo()) { 6313 if (SpecInfo->getPointOfInstantiation().isInvalid()) 6314 SpecInfo->setPointOfInstantiation(Loc); 6315 else 6316 AlreadyInstantiated = true; 6317 } else if (MemberSpecializationInfo *MSInfo 6318 = Function->getMemberSpecializationInfo()) { 6319 if (MSInfo->getPointOfInstantiation().isInvalid()) 6320 MSInfo->setPointOfInstantiation(Loc); 6321 else 6322 AlreadyInstantiated = true; 6323 } 6324 6325 if (!AlreadyInstantiated) 6326 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6327 } 6328 6329 // FIXME: keep track of references to static functions 6330 Function->setUsed(true); 6331 return; 6332 } 6333 6334 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6335 // Implicit instantiation of static data members of class templates. 6336 if (Var->isStaticDataMember() && 6337 Var->getInstantiatedFromStaticDataMember()) { 6338 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 6339 assert(MSInfo && "Missing member specialization information?"); 6340 if (MSInfo->getPointOfInstantiation().isInvalid() && 6341 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) { 6342 MSInfo->setPointOfInstantiation(Loc); 6343 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6344 } 6345 } 6346 6347 // FIXME: keep track of references to static data? 6348 6349 D->setUsed(true); 6350 return; 6351 } 6352} 6353 6354bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc, 6355 CallExpr *CE, FunctionDecl *FD) { 6356 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType()) 6357 return false; 6358 6359 PartialDiagnostic Note = 6360 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here) 6361 << FD->getDeclName() : PDiag(); 6362 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation(); 6363 6364 if (RequireCompleteType(Loc, ReturnType, 6365 FD ? 6366 PDiag(diag::err_call_function_incomplete_return) 6367 << CE->getSourceRange() << FD->getDeclName() : 6368 PDiag(diag::err_call_incomplete_return) 6369 << CE->getSourceRange(), 6370 std::make_pair(NoteLoc, Note))) 6371 return true; 6372 6373 return false; 6374} 6375 6376// Diagnose the common s/=/==/ typo. Note that adding parentheses 6377// will prevent this condition from triggering, which is what we want. 6378void Sema::DiagnoseAssignmentAsCondition(Expr *E) { 6379 SourceLocation Loc; 6380 6381 if (isa<BinaryOperator>(E)) { 6382 BinaryOperator *Op = cast<BinaryOperator>(E); 6383 if (Op->getOpcode() != BinaryOperator::Assign) 6384 return; 6385 6386 Loc = Op->getOperatorLoc(); 6387 } else if (isa<CXXOperatorCallExpr>(E)) { 6388 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E); 6389 if (Op->getOperator() != OO_Equal) 6390 return; 6391 6392 Loc = Op->getOperatorLoc(); 6393 } else { 6394 // Not an assignment. 6395 return; 6396 } 6397 6398 SourceLocation Open = E->getSourceRange().getBegin(); 6399 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd()); 6400 6401 Diag(Loc, diag::warn_condition_is_assignment) 6402 << E->getSourceRange() 6403 << CodeModificationHint::CreateInsertion(Open, "(") 6404 << CodeModificationHint::CreateInsertion(Close, ")"); 6405} 6406 6407bool Sema::CheckBooleanCondition(Expr *&E, SourceLocation Loc) { 6408 DiagnoseAssignmentAsCondition(E); 6409 6410 if (!E->isTypeDependent()) { 6411 DefaultFunctionArrayConversion(E); 6412 6413 QualType T = E->getType(); 6414 6415 if (getLangOptions().CPlusPlus) { 6416 if (CheckCXXBooleanCondition(E)) // C++ 6.4p4 6417 return true; 6418 } else if (!T->isScalarType()) { // C99 6.8.4.1p1 6419 Diag(Loc, diag::err_typecheck_statement_requires_scalar) 6420 << T << E->getSourceRange(); 6421 return true; 6422 } 6423 } 6424 6425 return false; 6426} 6427