SemaExpr.cpp revision 8d6d90d5499d4248761251811ebed0ae77665ed7
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); 245 return Expr; 246 } 247 if (Ty->isPromotableIntegerType()) { 248 QualType PT = Context.getPromotedIntegerType(Ty); 249 ImpCastExprToType(Expr, PT); 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); 268 269 UsualUnaryConversions(Expr); 270} 271 272/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 273/// will warn if the resulting type is not a POD type, and rejects ObjC 274/// interfaces passed by value. This returns true if the argument type is 275/// completely illegal. 276bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 277 DefaultArgumentPromotion(Expr); 278 279 if (Expr->getType()->isObjCInterfaceType()) { 280 Diag(Expr->getLocStart(), 281 diag::err_cannot_pass_objc_interface_to_vararg) 282 << Expr->getType() << CT; 283 return true; 284 } 285 286 if (!Expr->getType()->isPODType()) 287 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 288 << Expr->getType() << CT; 289 290 return false; 291} 292 293 294/// UsualArithmeticConversions - Performs various conversions that are common to 295/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 296/// routine returns the first non-arithmetic type found. The client is 297/// responsible for emitting appropriate error diagnostics. 298/// FIXME: verify the conversion rules for "complex int" are consistent with 299/// GCC. 300QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 301 bool isCompAssign) { 302 if (!isCompAssign) 303 UsualUnaryConversions(lhsExpr); 304 305 UsualUnaryConversions(rhsExpr); 306 307 // For conversion purposes, we ignore any qualifiers. 308 // For example, "const float" and "float" are equivalent. 309 QualType lhs = 310 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 311 QualType rhs = 312 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 313 314 // If both types are identical, no conversion is needed. 315 if (lhs == rhs) 316 return lhs; 317 318 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 319 // The caller can deal with this (e.g. pointer + int). 320 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 321 return lhs; 322 323 // Perform bitfield promotions. 324 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr); 325 if (!LHSBitfieldPromoteTy.isNull()) 326 lhs = LHSBitfieldPromoteTy; 327 QualType RHSBitfieldPromoteTy = Context.isPromotableBitField(rhsExpr); 328 if (!RHSBitfieldPromoteTy.isNull()) 329 rhs = RHSBitfieldPromoteTy; 330 331 QualType destType = Context.UsualArithmeticConversionsType(lhs, rhs); 332 if (!isCompAssign) 333 ImpCastExprToType(lhsExpr, destType); 334 ImpCastExprToType(rhsExpr, destType); 335 return destType; 336} 337 338//===----------------------------------------------------------------------===// 339// Semantic Analysis for various Expression Types 340//===----------------------------------------------------------------------===// 341 342 343/// ActOnStringLiteral - The specified tokens were lexed as pasted string 344/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 345/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 346/// multiple tokens. However, the common case is that StringToks points to one 347/// string. 348/// 349Action::OwningExprResult 350Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 351 assert(NumStringToks && "Must have at least one string!"); 352 353 StringLiteralParser Literal(StringToks, NumStringToks, PP); 354 if (Literal.hadError) 355 return ExprError(); 356 357 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 358 for (unsigned i = 0; i != NumStringToks; ++i) 359 StringTokLocs.push_back(StringToks[i].getLocation()); 360 361 QualType StrTy = Context.CharTy; 362 if (Literal.AnyWide) StrTy = Context.getWCharType(); 363 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 364 365 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 366 if (getLangOptions().CPlusPlus) 367 StrTy.addConst(); 368 369 // Get an array type for the string, according to C99 6.4.5. This includes 370 // the nul terminator character as well as the string length for pascal 371 // strings. 372 StrTy = Context.getConstantArrayType(StrTy, 373 llvm::APInt(32, Literal.GetNumStringChars()+1), 374 ArrayType::Normal, 0); 375 376 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 377 return Owned(StringLiteral::Create(Context, Literal.GetString(), 378 Literal.GetStringLength(), 379 Literal.AnyWide, StrTy, 380 &StringTokLocs[0], 381 StringTokLocs.size())); 382} 383 384/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 385/// CurBlock to VD should cause it to be snapshotted (as we do for auto 386/// variables defined outside the block) or false if this is not needed (e.g. 387/// for values inside the block or for globals). 388/// 389/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 390/// up-to-date. 391/// 392static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 393 ValueDecl *VD) { 394 // If the value is defined inside the block, we couldn't snapshot it even if 395 // we wanted to. 396 if (CurBlock->TheDecl == VD->getDeclContext()) 397 return false; 398 399 // If this is an enum constant or function, it is constant, don't snapshot. 400 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 401 return false; 402 403 // If this is a reference to an extern, static, or global variable, no need to 404 // snapshot it. 405 // FIXME: What about 'const' variables in C++? 406 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 407 if (!Var->hasLocalStorage()) 408 return false; 409 410 // Blocks that have these can't be constant. 411 CurBlock->hasBlockDeclRefExprs = true; 412 413 // If we have nested blocks, the decl may be declared in an outer block (in 414 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 415 // be defined outside all of the current blocks (in which case the blocks do 416 // all get the bit). Walk the nesting chain. 417 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 418 NextBlock = NextBlock->PrevBlockInfo) { 419 // If we found the defining block for the variable, don't mark the block as 420 // having a reference outside it. 421 if (NextBlock->TheDecl == VD->getDeclContext()) 422 break; 423 424 // Otherwise, the DeclRef from the inner block causes the outer one to need 425 // a snapshot as well. 426 NextBlock->hasBlockDeclRefExprs = true; 427 } 428 429 return true; 430} 431 432 433 434/// ActOnIdentifierExpr - The parser read an identifier in expression context, 435/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 436/// identifier is used in a function call context. 437/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 438/// class or namespace that the identifier must be a member of. 439Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 440 IdentifierInfo &II, 441 bool HasTrailingLParen, 442 const CXXScopeSpec *SS, 443 bool isAddressOfOperand) { 444 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 445 isAddressOfOperand); 446} 447 448/// BuildDeclRefExpr - Build either a DeclRefExpr or a 449/// QualifiedDeclRefExpr based on whether or not SS is a 450/// nested-name-specifier. 451Sema::OwningExprResult 452Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 453 bool TypeDependent, bool ValueDependent, 454 const CXXScopeSpec *SS) { 455 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 456 Diag(Loc, 457 diag::err_auto_variable_cannot_appear_in_own_initializer) 458 << D->getDeclName(); 459 return ExprError(); 460 } 461 462 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 463 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 464 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 465 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 466 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 467 << D->getIdentifier() << FD->getDeclName(); 468 Diag(D->getLocation(), diag::note_local_variable_declared_here) 469 << D->getIdentifier(); 470 return ExprError(); 471 } 472 } 473 } 474 } 475 476 MarkDeclarationReferenced(Loc, D); 477 478 Expr *E; 479 if (SS && !SS->isEmpty()) { 480 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 481 ValueDependent, SS->getRange(), 482 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 483 } else 484 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 485 486 return Owned(E); 487} 488 489/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 490/// variable corresponding to the anonymous union or struct whose type 491/// is Record. 492static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 493 RecordDecl *Record) { 494 assert(Record->isAnonymousStructOrUnion() && 495 "Record must be an anonymous struct or union!"); 496 497 // FIXME: Once Decls are directly linked together, this will be an O(1) 498 // operation rather than a slow walk through DeclContext's vector (which 499 // itself will be eliminated). DeclGroups might make this even better. 500 DeclContext *Ctx = Record->getDeclContext(); 501 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 502 DEnd = Ctx->decls_end(); 503 D != DEnd; ++D) { 504 if (*D == Record) { 505 // The object for the anonymous struct/union directly 506 // follows its type in the list of declarations. 507 ++D; 508 assert(D != DEnd && "Missing object for anonymous record"); 509 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 510 return *D; 511 } 512 } 513 514 assert(false && "Missing object for anonymous record"); 515 return 0; 516} 517 518/// \brief Given a field that represents a member of an anonymous 519/// struct/union, build the path from that field's context to the 520/// actual member. 521/// 522/// Construct the sequence of field member references we'll have to 523/// perform to get to the field in the anonymous union/struct. The 524/// list of members is built from the field outward, so traverse it 525/// backwards to go from an object in the current context to the field 526/// we found. 527/// 528/// \returns The variable from which the field access should begin, 529/// for an anonymous struct/union that is not a member of another 530/// class. Otherwise, returns NULL. 531VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 532 llvm::SmallVectorImpl<FieldDecl *> &Path) { 533 assert(Field->getDeclContext()->isRecord() && 534 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 535 && "Field must be stored inside an anonymous struct or union"); 536 537 Path.push_back(Field); 538 VarDecl *BaseObject = 0; 539 DeclContext *Ctx = Field->getDeclContext(); 540 do { 541 RecordDecl *Record = cast<RecordDecl>(Ctx); 542 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 543 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 544 Path.push_back(AnonField); 545 else { 546 BaseObject = cast<VarDecl>(AnonObject); 547 break; 548 } 549 Ctx = Ctx->getParent(); 550 } while (Ctx->isRecord() && 551 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 552 553 return BaseObject; 554} 555 556Sema::OwningExprResult 557Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 558 FieldDecl *Field, 559 Expr *BaseObjectExpr, 560 SourceLocation OpLoc) { 561 llvm::SmallVector<FieldDecl *, 4> AnonFields; 562 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 563 AnonFields); 564 565 // Build the expression that refers to the base object, from 566 // which we will build a sequence of member references to each 567 // of the anonymous union objects and, eventually, the field we 568 // found via name lookup. 569 bool BaseObjectIsPointer = false; 570 Qualifiers BaseQuals; 571 if (BaseObject) { 572 // BaseObject is an anonymous struct/union variable (and is, 573 // therefore, not part of another non-anonymous record). 574 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 575 MarkDeclarationReferenced(Loc, BaseObject); 576 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 577 SourceLocation()); 578 BaseQuals 579 = Context.getCanonicalType(BaseObject->getType()).getQualifiers(); 580 } else if (BaseObjectExpr) { 581 // The caller provided the base object expression. Determine 582 // whether its a pointer and whether it adds any qualifiers to the 583 // anonymous struct/union fields we're looking into. 584 QualType ObjectType = BaseObjectExpr->getType(); 585 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) { 586 BaseObjectIsPointer = true; 587 ObjectType = ObjectPtr->getPointeeType(); 588 } 589 BaseQuals 590 = Context.getCanonicalType(ObjectType).getQualifiers(); 591 } else { 592 // We've found a member of an anonymous struct/union that is 593 // inside a non-anonymous struct/union, so in a well-formed 594 // program our base object expression is "this". 595 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 596 if (!MD->isStatic()) { 597 QualType AnonFieldType 598 = Context.getTagDeclType( 599 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 600 QualType ThisType = Context.getTagDeclType(MD->getParent()); 601 if ((Context.getCanonicalType(AnonFieldType) 602 == Context.getCanonicalType(ThisType)) || 603 IsDerivedFrom(ThisType, AnonFieldType)) { 604 // Our base object expression is "this". 605 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 606 MD->getThisType(Context)); 607 BaseObjectIsPointer = true; 608 } 609 } else { 610 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 611 << Field->getDeclName()); 612 } 613 BaseQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 614 } 615 616 if (!BaseObjectExpr) 617 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 618 << Field->getDeclName()); 619 } 620 621 // Build the implicit member references to the field of the 622 // anonymous struct/union. 623 Expr *Result = BaseObjectExpr; 624 Qualifiers ResultQuals = BaseQuals; 625 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 626 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 627 FI != FIEnd; ++FI) { 628 QualType MemberType = (*FI)->getType(); 629 Qualifiers MemberTypeQuals = 630 Context.getCanonicalType(MemberType).getQualifiers(); 631 632 // CVR attributes from the base are picked up by members, 633 // except that 'mutable' members don't pick up 'const'. 634 if ((*FI)->isMutable()) 635 ResultQuals.removeConst(); 636 637 // GC attributes are never picked up by members. 638 ResultQuals.removeObjCGCAttr(); 639 640 // TR 18037 does not allow fields to be declared with address spaces. 641 assert(!MemberTypeQuals.hasAddressSpace()); 642 643 Qualifiers NewQuals = ResultQuals + MemberTypeQuals; 644 if (NewQuals != MemberTypeQuals) 645 MemberType = Context.getQualifiedType(MemberType, NewQuals); 646 647 MarkDeclarationReferenced(Loc, *FI); 648 // FIXME: Might this end up being a qualified name? 649 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 650 OpLoc, MemberType); 651 BaseObjectIsPointer = false; 652 ResultQuals = NewQuals; 653 } 654 655 return Owned(Result); 656} 657 658/// ActOnDeclarationNameExpr - The parser has read some kind of name 659/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 660/// performs lookup on that name and returns an expression that refers 661/// to that name. This routine isn't directly called from the parser, 662/// because the parser doesn't know about DeclarationName. Rather, 663/// this routine is called by ActOnIdentifierExpr, 664/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 665/// which form the DeclarationName from the corresponding syntactic 666/// forms. 667/// 668/// HasTrailingLParen indicates whether this identifier is used in a 669/// function call context. LookupCtx is only used for a C++ 670/// qualified-id (foo::bar) to indicate the class or namespace that 671/// the identifier must be a member of. 672/// 673/// isAddressOfOperand means that this expression is the direct operand 674/// of an address-of operator. This matters because this is the only 675/// situation where a qualified name referencing a non-static member may 676/// appear outside a member function of this class. 677Sema::OwningExprResult 678Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 679 DeclarationName Name, bool HasTrailingLParen, 680 const CXXScopeSpec *SS, 681 bool isAddressOfOperand) { 682 // Could be enum-constant, value decl, instance variable, etc. 683 if (SS && SS->isInvalid()) 684 return ExprError(); 685 686 // C++ [temp.dep.expr]p3: 687 // An id-expression is type-dependent if it contains: 688 // -- a nested-name-specifier that contains a class-name that 689 // names a dependent type. 690 // FIXME: Member of the current instantiation. 691 if (SS && isDependentScopeSpecifier(*SS)) { 692 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 693 Loc, SS->getRange(), 694 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 695 isAddressOfOperand)); 696 } 697 698 LookupResult Lookup; 699 LookupParsedName(Lookup, S, SS, Name, LookupOrdinaryName, false, true, Loc); 700 701 if (Lookup.isAmbiguous()) { 702 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 703 SS && SS->isSet() ? SS->getRange() 704 : SourceRange()); 705 return ExprError(); 706 } 707 708 NamedDecl *D = Lookup.getAsSingleDecl(Context); 709 710 // If this reference is in an Objective-C method, then ivar lookup happens as 711 // well. 712 IdentifierInfo *II = Name.getAsIdentifierInfo(); 713 if (II && getCurMethodDecl()) { 714 // There are two cases to handle here. 1) scoped lookup could have failed, 715 // in which case we should look for an ivar. 2) scoped lookup could have 716 // found a decl, but that decl is outside the current instance method (i.e. 717 // a global variable). In these two cases, we do a lookup for an ivar with 718 // this name, if the lookup sucedes, we replace it our current decl. 719 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 720 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 721 ObjCInterfaceDecl *ClassDeclared; 722 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 723 // Check if referencing a field with __attribute__((deprecated)). 724 if (DiagnoseUseOfDecl(IV, Loc)) 725 return ExprError(); 726 727 // If we're referencing an invalid decl, just return this as a silent 728 // error node. The error diagnostic was already emitted on the decl. 729 if (IV->isInvalidDecl()) 730 return ExprError(); 731 732 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 733 // If a class method attemps to use a free standing ivar, this is 734 // an error. 735 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 736 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 737 << IV->getDeclName()); 738 // If a class method uses a global variable, even if an ivar with 739 // same name exists, use the global. 740 if (!IsClsMethod) { 741 if (IV->getAccessControl() == ObjCIvarDecl::Private && 742 ClassDeclared != IFace) 743 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 744 // FIXME: This should use a new expr for a direct reference, don't 745 // turn this into Self->ivar, just return a BareIVarExpr or something. 746 IdentifierInfo &II = Context.Idents.get("self"); 747 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 748 II, false); 749 MarkDeclarationReferenced(Loc, IV); 750 return Owned(new (Context) 751 ObjCIvarRefExpr(IV, IV->getType(), Loc, 752 SelfExpr.takeAs<Expr>(), true, true)); 753 } 754 } 755 } else if (getCurMethodDecl()->isInstanceMethod()) { 756 // We should warn if a local variable hides an ivar. 757 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 758 ObjCInterfaceDecl *ClassDeclared; 759 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 760 if (IV->getAccessControl() != ObjCIvarDecl::Private || 761 IFace == ClassDeclared) 762 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 763 } 764 } 765 // Needed to implement property "super.method" notation. 766 if (D == 0 && II->isStr("super")) { 767 QualType T; 768 769 if (getCurMethodDecl()->isInstanceMethod()) 770 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 771 getCurMethodDecl()->getClassInterface())); 772 else 773 T = Context.getObjCClassType(); 774 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 775 } 776 } 777 778 // Determine whether this name might be a candidate for 779 // argument-dependent lookup. 780 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 781 HasTrailingLParen; 782 783 if (ADL && D == 0) { 784 // We've seen something of the form 785 // 786 // identifier( 787 // 788 // and we did not find any entity by the name 789 // "identifier". However, this identifier is still subject to 790 // argument-dependent lookup, so keep track of the name. 791 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 792 Context.OverloadTy, 793 Loc)); 794 } 795 796 if (D == 0) { 797 // Otherwise, this could be an implicitly declared function reference (legal 798 // in C90, extension in C99). 799 if (HasTrailingLParen && II && 800 !getLangOptions().CPlusPlus) // Not in C++. 801 D = ImplicitlyDefineFunction(Loc, *II, S); 802 else { 803 // If this name wasn't predeclared and if this is not a function call, 804 // diagnose the problem. 805 if (SS && !SS->isEmpty()) 806 return ExprError(Diag(Loc, diag::err_no_member) 807 << Name << computeDeclContext(*SS, false) 808 << SS->getRange()); 809 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 810 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 811 return ExprError(Diag(Loc, diag::err_undeclared_use) 812 << Name.getAsString()); 813 else 814 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 815 } 816 } 817 818 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 819 // Warn about constructs like: 820 // if (void *X = foo()) { ... } else { X }. 821 // In the else block, the pointer is always false. 822 823 // FIXME: In a template instantiation, we don't have scope 824 // information to check this property. 825 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 826 Scope *CheckS = S; 827 while (CheckS) { 828 if (CheckS->isWithinElse() && 829 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 830 if (Var->getType()->isBooleanType()) 831 ExprError(Diag(Loc, diag::warn_value_always_false) 832 << Var->getDeclName()); 833 else 834 ExprError(Diag(Loc, diag::warn_value_always_zero) 835 << Var->getDeclName()); 836 break; 837 } 838 839 // Move up one more control parent to check again. 840 CheckS = CheckS->getControlParent(); 841 if (CheckS) 842 CheckS = CheckS->getParent(); 843 } 844 } 845 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 846 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 847 // C99 DR 316 says that, if a function type comes from a 848 // function definition (without a prototype), that type is only 849 // used for checking compatibility. Therefore, when referencing 850 // the function, we pretend that we don't have the full function 851 // type. 852 if (DiagnoseUseOfDecl(Func, Loc)) 853 return ExprError(); 854 855 QualType T = Func->getType(); 856 QualType NoProtoType = T; 857 if (const FunctionProtoType *Proto = T->getAs<FunctionProtoType>()) 858 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 859 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 860 } 861 } 862 863 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 864} 865/// \brief Cast member's object to its own class if necessary. 866bool 867Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 868 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 869 if (CXXRecordDecl *RD = 870 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 871 QualType DestType = 872 Context.getCanonicalType(Context.getTypeDeclType(RD)); 873 if (DestType->isDependentType() || From->getType()->isDependentType()) 874 return false; 875 QualType FromRecordType = From->getType(); 876 QualType DestRecordType = DestType; 877 if (FromRecordType->getAs<PointerType>()) { 878 DestType = Context.getPointerType(DestType); 879 FromRecordType = FromRecordType->getPointeeType(); 880 } 881 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 882 CheckDerivedToBaseConversion(FromRecordType, 883 DestRecordType, 884 From->getSourceRange().getBegin(), 885 From->getSourceRange())) 886 return true; 887 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 888 /*isLvalue=*/true); 889 } 890 return false; 891} 892 893/// \brief Build a MemberExpr AST node. 894static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, 895 const CXXScopeSpec *SS, NamedDecl *Member, 896 SourceLocation Loc, QualType Ty) { 897 if (SS && SS->isSet()) 898 return MemberExpr::Create(C, Base, isArrow, 899 (NestedNameSpecifier *)SS->getScopeRep(), 900 SS->getRange(), Member, Loc, 901 // FIXME: Explicit template argument lists 902 false, SourceLocation(), 0, 0, SourceLocation(), 903 Ty); 904 905 return new (C) MemberExpr(Base, isArrow, Member, Loc, Ty); 906} 907 908/// \brief Complete semantic analysis for a reference to the given declaration. 909Sema::OwningExprResult 910Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 911 bool HasTrailingLParen, 912 const CXXScopeSpec *SS, 913 bool isAddressOfOperand) { 914 assert(D && "Cannot refer to a NULL declaration"); 915 DeclarationName Name = D->getDeclName(); 916 917 // If this is an expression of the form &Class::member, don't build an 918 // implicit member ref, because we want a pointer to the member in general, 919 // not any specific instance's member. 920 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 921 DeclContext *DC = computeDeclContext(*SS); 922 if (D && isa<CXXRecordDecl>(DC)) { 923 QualType DType; 924 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 925 DType = FD->getType().getNonReferenceType(); 926 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 927 DType = Method->getType(); 928 } else if (isa<OverloadedFunctionDecl>(D)) { 929 DType = Context.OverloadTy; 930 } 931 // Could be an inner type. That's diagnosed below, so ignore it here. 932 if (!DType.isNull()) { 933 // The pointer is type- and value-dependent if it points into something 934 // dependent. 935 bool Dependent = DC->isDependentContext(); 936 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 937 } 938 } 939 } 940 941 // We may have found a field within an anonymous union or struct 942 // (C++ [class.union]). 943 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 944 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 945 return BuildAnonymousStructUnionMemberReference(Loc, FD); 946 947 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 948 if (!MD->isStatic()) { 949 // C++ [class.mfct.nonstatic]p2: 950 // [...] if name lookup (3.4.1) resolves the name in the 951 // id-expression to a nonstatic nontype member of class X or of 952 // a base class of X, the id-expression is transformed into a 953 // class member access expression (5.2.5) using (*this) (9.3.2) 954 // as the postfix-expression to the left of the '.' operator. 955 DeclContext *Ctx = 0; 956 QualType MemberType; 957 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 958 Ctx = FD->getDeclContext(); 959 MemberType = FD->getType(); 960 961 if (const ReferenceType *RefType = MemberType->getAs<ReferenceType>()) 962 MemberType = RefType->getPointeeType(); 963 else if (!FD->isMutable()) 964 MemberType 965 = Context.getQualifiedType(MemberType, 966 Qualifiers::fromCVRMask(MD->getTypeQualifiers())); 967 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 968 if (!Method->isStatic()) { 969 Ctx = Method->getParent(); 970 MemberType = Method->getType(); 971 } 972 } else if (FunctionTemplateDecl *FunTmpl 973 = dyn_cast<FunctionTemplateDecl>(D)) { 974 if (CXXMethodDecl *Method 975 = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())) { 976 if (!Method->isStatic()) { 977 Ctx = Method->getParent(); 978 MemberType = Context.OverloadTy; 979 } 980 } 981 } else if (OverloadedFunctionDecl *Ovl 982 = dyn_cast<OverloadedFunctionDecl>(D)) { 983 // FIXME: We need an abstraction for iterating over one or more function 984 // templates or functions. This code is far too repetitive! 985 for (OverloadedFunctionDecl::function_iterator 986 Func = Ovl->function_begin(), 987 FuncEnd = Ovl->function_end(); 988 Func != FuncEnd; ++Func) { 989 CXXMethodDecl *DMethod = 0; 990 if (FunctionTemplateDecl *FunTmpl 991 = dyn_cast<FunctionTemplateDecl>(*Func)) 992 DMethod = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 993 else 994 DMethod = dyn_cast<CXXMethodDecl>(*Func); 995 996 if (DMethod && !DMethod->isStatic()) { 997 Ctx = DMethod->getDeclContext(); 998 MemberType = Context.OverloadTy; 999 break; 1000 } 1001 } 1002 } 1003 1004 if (Ctx && Ctx->isRecord()) { 1005 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1006 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1007 if ((Context.getCanonicalType(CtxType) 1008 == Context.getCanonicalType(ThisType)) || 1009 IsDerivedFrom(ThisType, CtxType)) { 1010 // Build the implicit member access expression. 1011 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1012 MD->getThisType(Context)); 1013 MarkDeclarationReferenced(Loc, D); 1014 if (PerformObjectMemberConversion(This, D)) 1015 return ExprError(); 1016 1017 bool ShouldCheckUse = true; 1018 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1019 // Don't diagnose the use of a virtual member function unless it's 1020 // explicitly qualified. 1021 if (MD->isVirtual() && (!SS || !SS->isSet())) 1022 ShouldCheckUse = false; 1023 } 1024 1025 if (ShouldCheckUse && DiagnoseUseOfDecl(D, Loc)) 1026 return ExprError(); 1027 return Owned(BuildMemberExpr(Context, This, true, SS, D, 1028 Loc, MemberType)); 1029 } 1030 } 1031 } 1032 } 1033 1034 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1035 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1036 if (MD->isStatic()) 1037 // "invalid use of member 'x' in static member function" 1038 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1039 << FD->getDeclName()); 1040 } 1041 1042 // Any other ways we could have found the field in a well-formed 1043 // program would have been turned into implicit member expressions 1044 // above. 1045 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1046 << FD->getDeclName()); 1047 } 1048 1049 if (isa<TypedefDecl>(D)) 1050 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1051 if (isa<ObjCInterfaceDecl>(D)) 1052 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1053 if (isa<NamespaceDecl>(D)) 1054 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1055 1056 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1057 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1058 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1059 false, false, SS); 1060 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1061 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1062 false, false, SS); 1063 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 1064 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 1065 /*TypeDependent=*/true, 1066 /*ValueDependent=*/true, SS); 1067 1068 ValueDecl *VD = cast<ValueDecl>(D); 1069 1070 // Check whether this declaration can be used. Note that we suppress 1071 // this check when we're going to perform argument-dependent lookup 1072 // on this function name, because this might not be the function 1073 // that overload resolution actually selects. 1074 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1075 HasTrailingLParen; 1076 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1077 return ExprError(); 1078 1079 // Only create DeclRefExpr's for valid Decl's. 1080 if (VD->isInvalidDecl()) 1081 return ExprError(); 1082 1083 // If the identifier reference is inside a block, and it refers to a value 1084 // that is outside the block, create a BlockDeclRefExpr instead of a 1085 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1086 // the block is formed. 1087 // 1088 // We do not do this for things like enum constants, global variables, etc, 1089 // as they do not get snapshotted. 1090 // 1091 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1092 MarkDeclarationReferenced(Loc, VD); 1093 QualType ExprTy = VD->getType().getNonReferenceType(); 1094 // The BlocksAttr indicates the variable is bound by-reference. 1095 if (VD->getAttr<BlocksAttr>()) 1096 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1097 // This is to record that a 'const' was actually synthesize and added. 1098 bool constAdded = !ExprTy.isConstQualified(); 1099 // Variable will be bound by-copy, make it const within the closure. 1100 1101 ExprTy.addConst(); 1102 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1103 constAdded)); 1104 } 1105 // If this reference is not in a block or if the referenced variable is 1106 // within the block, create a normal DeclRefExpr. 1107 1108 bool TypeDependent = false; 1109 bool ValueDependent = false; 1110 if (getLangOptions().CPlusPlus) { 1111 // C++ [temp.dep.expr]p3: 1112 // An id-expression is type-dependent if it contains: 1113 // - an identifier that was declared with a dependent type, 1114 if (VD->getType()->isDependentType()) 1115 TypeDependent = true; 1116 // - FIXME: a template-id that is dependent, 1117 // - a conversion-function-id that specifies a dependent type, 1118 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1119 Name.getCXXNameType()->isDependentType()) 1120 TypeDependent = true; 1121 // - a nested-name-specifier that contains a class-name that 1122 // names a dependent type. 1123 else if (SS && !SS->isEmpty()) { 1124 for (DeclContext *DC = computeDeclContext(*SS); 1125 DC; DC = DC->getParent()) { 1126 // FIXME: could stop early at namespace scope. 1127 if (DC->isRecord()) { 1128 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1129 if (Context.getTypeDeclType(Record)->isDependentType()) { 1130 TypeDependent = true; 1131 break; 1132 } 1133 } 1134 } 1135 } 1136 1137 // C++ [temp.dep.constexpr]p2: 1138 // 1139 // An identifier is value-dependent if it is: 1140 // - a name declared with a dependent type, 1141 if (TypeDependent) 1142 ValueDependent = true; 1143 // - the name of a non-type template parameter, 1144 else if (isa<NonTypeTemplateParmDecl>(VD)) 1145 ValueDependent = true; 1146 // - a constant with integral or enumeration type and is 1147 // initialized with an expression that is value-dependent 1148 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1149 if (Dcl->getType().getCVRQualifiers() == Qualifiers::Const && 1150 Dcl->getInit()) { 1151 ValueDependent = Dcl->getInit()->isValueDependent(); 1152 } 1153 } 1154 } 1155 1156 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1157 TypeDependent, ValueDependent, SS); 1158} 1159 1160Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1161 tok::TokenKind Kind) { 1162 PredefinedExpr::IdentType IT; 1163 1164 switch (Kind) { 1165 default: assert(0 && "Unknown simple primary expr!"); 1166 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1167 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1168 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1169 } 1170 1171 // Pre-defined identifiers are of type char[x], where x is the length of the 1172 // string. 1173 1174 Decl *currentDecl = getCurFunctionOrMethodDecl(); 1175 if (!currentDecl) { 1176 Diag(Loc, diag::ext_predef_outside_function); 1177 currentDecl = Context.getTranslationUnitDecl(); 1178 } 1179 1180 QualType ResTy; 1181 if (cast<DeclContext>(currentDecl)->isDependentContext()) { 1182 ResTy = Context.DependentTy; 1183 } else { 1184 unsigned Length = 1185 PredefinedExpr::ComputeName(Context, IT, currentDecl).length(); 1186 1187 llvm::APInt LengthI(32, Length + 1); 1188 ResTy = Context.CharTy.withConst(); 1189 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1190 } 1191 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1192} 1193 1194Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1195 llvm::SmallString<16> CharBuffer; 1196 CharBuffer.resize(Tok.getLength()); 1197 const char *ThisTokBegin = &CharBuffer[0]; 1198 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1199 1200 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1201 Tok.getLocation(), PP); 1202 if (Literal.hadError()) 1203 return ExprError(); 1204 1205 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1206 1207 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1208 Literal.isWide(), 1209 type, Tok.getLocation())); 1210} 1211 1212Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1213 // Fast path for a single digit (which is quite common). A single digit 1214 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1215 if (Tok.getLength() == 1) { 1216 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1217 unsigned IntSize = Context.Target.getIntWidth(); 1218 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1219 Context.IntTy, Tok.getLocation())); 1220 } 1221 1222 llvm::SmallString<512> IntegerBuffer; 1223 // Add padding so that NumericLiteralParser can overread by one character. 1224 IntegerBuffer.resize(Tok.getLength()+1); 1225 const char *ThisTokBegin = &IntegerBuffer[0]; 1226 1227 // Get the spelling of the token, which eliminates trigraphs, etc. 1228 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1229 1230 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1231 Tok.getLocation(), PP); 1232 if (Literal.hadError) 1233 return ExprError(); 1234 1235 Expr *Res; 1236 1237 if (Literal.isFloatingLiteral()) { 1238 QualType Ty; 1239 if (Literal.isFloat) 1240 Ty = Context.FloatTy; 1241 else if (!Literal.isLong) 1242 Ty = Context.DoubleTy; 1243 else 1244 Ty = Context.LongDoubleTy; 1245 1246 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1247 1248 // isExact will be set by GetFloatValue(). 1249 bool isExact = false; 1250 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1251 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1252 1253 } else if (!Literal.isIntegerLiteral()) { 1254 return ExprError(); 1255 } else { 1256 QualType Ty; 1257 1258 // long long is a C99 feature. 1259 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1260 Literal.isLongLong) 1261 Diag(Tok.getLocation(), diag::ext_longlong); 1262 1263 // Get the value in the widest-possible width. 1264 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1265 1266 if (Literal.GetIntegerValue(ResultVal)) { 1267 // If this value didn't fit into uintmax_t, warn and force to ull. 1268 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1269 Ty = Context.UnsignedLongLongTy; 1270 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1271 "long long is not intmax_t?"); 1272 } else { 1273 // If this value fits into a ULL, try to figure out what else it fits into 1274 // according to the rules of C99 6.4.4.1p5. 1275 1276 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1277 // be an unsigned int. 1278 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1279 1280 // Check from smallest to largest, picking the smallest type we can. 1281 unsigned Width = 0; 1282 if (!Literal.isLong && !Literal.isLongLong) { 1283 // Are int/unsigned possibilities? 1284 unsigned IntSize = Context.Target.getIntWidth(); 1285 1286 // Does it fit in a unsigned int? 1287 if (ResultVal.isIntN(IntSize)) { 1288 // Does it fit in a signed int? 1289 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1290 Ty = Context.IntTy; 1291 else if (AllowUnsigned) 1292 Ty = Context.UnsignedIntTy; 1293 Width = IntSize; 1294 } 1295 } 1296 1297 // Are long/unsigned long possibilities? 1298 if (Ty.isNull() && !Literal.isLongLong) { 1299 unsigned LongSize = Context.Target.getLongWidth(); 1300 1301 // Does it fit in a unsigned long? 1302 if (ResultVal.isIntN(LongSize)) { 1303 // Does it fit in a signed long? 1304 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1305 Ty = Context.LongTy; 1306 else if (AllowUnsigned) 1307 Ty = Context.UnsignedLongTy; 1308 Width = LongSize; 1309 } 1310 } 1311 1312 // Finally, check long long if needed. 1313 if (Ty.isNull()) { 1314 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1315 1316 // Does it fit in a unsigned long long? 1317 if (ResultVal.isIntN(LongLongSize)) { 1318 // Does it fit in a signed long long? 1319 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1320 Ty = Context.LongLongTy; 1321 else if (AllowUnsigned) 1322 Ty = Context.UnsignedLongLongTy; 1323 Width = LongLongSize; 1324 } 1325 } 1326 1327 // If we still couldn't decide a type, we probably have something that 1328 // does not fit in a signed long long, but has no U suffix. 1329 if (Ty.isNull()) { 1330 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1331 Ty = Context.UnsignedLongLongTy; 1332 Width = Context.Target.getLongLongWidth(); 1333 } 1334 1335 if (ResultVal.getBitWidth() != Width) 1336 ResultVal.trunc(Width); 1337 } 1338 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1339 } 1340 1341 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1342 if (Literal.isImaginary) 1343 Res = new (Context) ImaginaryLiteral(Res, 1344 Context.getComplexType(Res->getType())); 1345 1346 return Owned(Res); 1347} 1348 1349Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1350 SourceLocation R, ExprArg Val) { 1351 Expr *E = Val.takeAs<Expr>(); 1352 assert((E != 0) && "ActOnParenExpr() missing expr"); 1353 return Owned(new (Context) ParenExpr(L, R, E)); 1354} 1355 1356/// The UsualUnaryConversions() function is *not* called by this routine. 1357/// See C99 6.3.2.1p[2-4] for more details. 1358bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1359 SourceLocation OpLoc, 1360 const SourceRange &ExprRange, 1361 bool isSizeof) { 1362 if (exprType->isDependentType()) 1363 return false; 1364 1365 // C99 6.5.3.4p1: 1366 if (isa<FunctionType>(exprType)) { 1367 // alignof(function) is allowed as an extension. 1368 if (isSizeof) 1369 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1370 return false; 1371 } 1372 1373 // Allow sizeof(void)/alignof(void) as an extension. 1374 if (exprType->isVoidType()) { 1375 Diag(OpLoc, diag::ext_sizeof_void_type) 1376 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1377 return false; 1378 } 1379 1380 if (RequireCompleteType(OpLoc, exprType, 1381 isSizeof ? diag::err_sizeof_incomplete_type : 1382 PDiag(diag::err_alignof_incomplete_type) 1383 << ExprRange)) 1384 return true; 1385 1386 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1387 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1388 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1389 << exprType << isSizeof << ExprRange; 1390 return true; 1391 } 1392 1393 return false; 1394} 1395 1396bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1397 const SourceRange &ExprRange) { 1398 E = E->IgnoreParens(); 1399 1400 // alignof decl is always ok. 1401 if (isa<DeclRefExpr>(E)) 1402 return false; 1403 1404 // Cannot know anything else if the expression is dependent. 1405 if (E->isTypeDependent()) 1406 return false; 1407 1408 if (E->getBitField()) { 1409 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1410 return true; 1411 } 1412 1413 // Alignment of a field access is always okay, so long as it isn't a 1414 // bit-field. 1415 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1416 if (isa<FieldDecl>(ME->getMemberDecl())) 1417 return false; 1418 1419 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1420} 1421 1422/// \brief Build a sizeof or alignof expression given a type operand. 1423Action::OwningExprResult 1424Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1425 bool isSizeOf, SourceRange R) { 1426 if (T.isNull()) 1427 return ExprError(); 1428 1429 if (!T->isDependentType() && 1430 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1431 return ExprError(); 1432 1433 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1434 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1435 Context.getSizeType(), OpLoc, 1436 R.getEnd())); 1437} 1438 1439/// \brief Build a sizeof or alignof expression given an expression 1440/// operand. 1441Action::OwningExprResult 1442Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1443 bool isSizeOf, SourceRange R) { 1444 // Verify that the operand is valid. 1445 bool isInvalid = false; 1446 if (E->isTypeDependent()) { 1447 // Delay type-checking for type-dependent expressions. 1448 } else if (!isSizeOf) { 1449 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1450 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1451 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1452 isInvalid = true; 1453 } else { 1454 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1455 } 1456 1457 if (isInvalid) 1458 return ExprError(); 1459 1460 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1461 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1462 Context.getSizeType(), OpLoc, 1463 R.getEnd())); 1464} 1465 1466/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1467/// the same for @c alignof and @c __alignof 1468/// Note that the ArgRange is invalid if isType is false. 1469Action::OwningExprResult 1470Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1471 void *TyOrEx, const SourceRange &ArgRange) { 1472 // If error parsing type, ignore. 1473 if (TyOrEx == 0) return ExprError(); 1474 1475 if (isType) { 1476 // FIXME: Preserve type source info. 1477 QualType ArgTy = GetTypeFromParser(TyOrEx); 1478 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1479 } 1480 1481 // Get the end location. 1482 Expr *ArgEx = (Expr *)TyOrEx; 1483 Action::OwningExprResult Result 1484 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1485 1486 if (Result.isInvalid()) 1487 DeleteExpr(ArgEx); 1488 1489 return move(Result); 1490} 1491 1492QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1493 if (V->isTypeDependent()) 1494 return Context.DependentTy; 1495 1496 // These operators return the element type of a complex type. 1497 if (const ComplexType *CT = V->getType()->getAs<ComplexType>()) 1498 return CT->getElementType(); 1499 1500 // Otherwise they pass through real integer and floating point types here. 1501 if (V->getType()->isArithmeticType()) 1502 return V->getType(); 1503 1504 // Reject anything else. 1505 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1506 << (isReal ? "__real" : "__imag"); 1507 return QualType(); 1508} 1509 1510 1511 1512Action::OwningExprResult 1513Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1514 tok::TokenKind Kind, ExprArg Input) { 1515 // Since this might be a postfix expression, get rid of ParenListExprs. 1516 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1517 Expr *Arg = (Expr *)Input.get(); 1518 1519 UnaryOperator::Opcode Opc; 1520 switch (Kind) { 1521 default: assert(0 && "Unknown unary op!"); 1522 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1523 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1524 } 1525 1526 if (getLangOptions().CPlusPlus && 1527 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1528 // Which overloaded operator? 1529 OverloadedOperatorKind OverOp = 1530 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1531 1532 // C++ [over.inc]p1: 1533 // 1534 // [...] If the function is a member function with one 1535 // parameter (which shall be of type int) or a non-member 1536 // function with two parameters (the second of which shall be 1537 // of type int), it defines the postfix increment operator ++ 1538 // for objects of that type. When the postfix increment is 1539 // called as a result of using the ++ operator, the int 1540 // argument will have value zero. 1541 Expr *Args[2] = { 1542 Arg, 1543 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1544 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1545 }; 1546 1547 // Build the candidate set for overloading 1548 OverloadCandidateSet CandidateSet; 1549 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1550 1551 // Perform overload resolution. 1552 OverloadCandidateSet::iterator Best; 1553 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1554 case OR_Success: { 1555 // We found a built-in operator or an overloaded operator. 1556 FunctionDecl *FnDecl = Best->Function; 1557 1558 if (FnDecl) { 1559 // We matched an overloaded operator. Build a call to that 1560 // operator. 1561 1562 // Convert the arguments. 1563 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1564 if (PerformObjectArgumentInitialization(Arg, Method)) 1565 return ExprError(); 1566 } else { 1567 // Convert the arguments. 1568 if (PerformCopyInitialization(Arg, 1569 FnDecl->getParamDecl(0)->getType(), 1570 "passing")) 1571 return ExprError(); 1572 } 1573 1574 // Determine the result type 1575 QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 1576 1577 // Build the actual expression node. 1578 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1579 SourceLocation()); 1580 UsualUnaryConversions(FnExpr); 1581 1582 Input.release(); 1583 Args[0] = Arg; 1584 1585 ExprOwningPtr<CXXOperatorCallExpr> 1586 TheCall(this, new (Context) CXXOperatorCallExpr(Context, OverOp, 1587 FnExpr, Args, 2, 1588 ResultTy, OpLoc)); 1589 1590 if (CheckCallReturnType(FnDecl->getResultType(), OpLoc, TheCall.get(), 1591 FnDecl)) 1592 return ExprError(); 1593 return Owned(TheCall.release()); 1594 1595 } else { 1596 // We matched a built-in operator. Convert the arguments, then 1597 // break out so that we will build the appropriate built-in 1598 // operator node. 1599 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1600 "passing")) 1601 return ExprError(); 1602 1603 break; 1604 } 1605 } 1606 1607 case OR_No_Viable_Function: { 1608 // No viable function; try checking this as a built-in operator, which 1609 // will fail and provide a diagnostic. Then, print the overload 1610 // candidates. 1611 OwningExprResult Result = CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1612 assert(Result.isInvalid() && 1613 "C++ postfix-unary operator overloading is missing candidates!"); 1614 if (Result.isInvalid()) 1615 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1616 1617 return move(Result); 1618 } 1619 1620 case OR_Ambiguous: 1621 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1622 << UnaryOperator::getOpcodeStr(Opc) 1623 << Arg->getSourceRange(); 1624 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1625 return ExprError(); 1626 1627 case OR_Deleted: 1628 Diag(OpLoc, diag::err_ovl_deleted_oper) 1629 << Best->Function->isDeleted() 1630 << UnaryOperator::getOpcodeStr(Opc) 1631 << Arg->getSourceRange(); 1632 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1633 return ExprError(); 1634 } 1635 1636 // Either we found no viable overloaded operator or we matched a 1637 // built-in operator. In either case, fall through to trying to 1638 // build a built-in operation. 1639 } 1640 1641 Input.release(); 1642 Input = Arg; 1643 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1644} 1645 1646Action::OwningExprResult 1647Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1648 ExprArg Idx, SourceLocation RLoc) { 1649 // Since this might be a postfix expression, get rid of ParenListExprs. 1650 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1651 1652 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1653 *RHSExp = static_cast<Expr*>(Idx.get()); 1654 1655 if (getLangOptions().CPlusPlus && 1656 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1657 Base.release(); 1658 Idx.release(); 1659 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1660 Context.DependentTy, RLoc)); 1661 } 1662 1663 if (getLangOptions().CPlusPlus && 1664 (LHSExp->getType()->isRecordType() || 1665 LHSExp->getType()->isEnumeralType() || 1666 RHSExp->getType()->isRecordType() || 1667 RHSExp->getType()->isEnumeralType())) { 1668 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1669 // to the candidate set. 1670 OverloadCandidateSet CandidateSet; 1671 Expr *Args[2] = { LHSExp, RHSExp }; 1672 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1673 SourceRange(LLoc, RLoc)); 1674 1675 // Perform overload resolution. 1676 OverloadCandidateSet::iterator Best; 1677 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1678 case OR_Success: { 1679 // We found a built-in operator or an overloaded operator. 1680 FunctionDecl *FnDecl = Best->Function; 1681 1682 if (FnDecl) { 1683 // We matched an overloaded operator. Build a call to that 1684 // operator. 1685 1686 // Convert the arguments. 1687 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1688 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1689 PerformCopyInitialization(RHSExp, 1690 FnDecl->getParamDecl(0)->getType(), 1691 "passing")) 1692 return ExprError(); 1693 } else { 1694 // Convert the arguments. 1695 if (PerformCopyInitialization(LHSExp, 1696 FnDecl->getParamDecl(0)->getType(), 1697 "passing") || 1698 PerformCopyInitialization(RHSExp, 1699 FnDecl->getParamDecl(1)->getType(), 1700 "passing")) 1701 return ExprError(); 1702 } 1703 1704 // Determine the result type 1705 QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 1706 1707 // Build the actual expression node. 1708 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1709 SourceLocation()); 1710 UsualUnaryConversions(FnExpr); 1711 1712 Base.release(); 1713 Idx.release(); 1714 Args[0] = LHSExp; 1715 Args[1] = RHSExp; 1716 1717 ExprOwningPtr<CXXOperatorCallExpr> 1718 TheCall(this, new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1719 FnExpr, Args, 2, 1720 ResultTy, RLoc)); 1721 if (CheckCallReturnType(FnDecl->getResultType(), LLoc, TheCall.get(), 1722 FnDecl)) 1723 return ExprError(); 1724 1725 return Owned(TheCall.release()); 1726 } else { 1727 // We matched a built-in operator. Convert the arguments, then 1728 // break out so that we will build the appropriate built-in 1729 // operator node. 1730 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1731 "passing") || 1732 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1733 "passing")) 1734 return ExprError(); 1735 1736 break; 1737 } 1738 } 1739 1740 case OR_No_Viable_Function: 1741 // No viable function; fall through to handling this as a 1742 // built-in operator, which will produce an error message for us. 1743 break; 1744 1745 case OR_Ambiguous: 1746 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1747 << "[]" 1748 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1749 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1750 return ExprError(); 1751 1752 case OR_Deleted: 1753 Diag(LLoc, diag::err_ovl_deleted_oper) 1754 << Best->Function->isDeleted() 1755 << "[]" 1756 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1757 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1758 return ExprError(); 1759 } 1760 1761 // Either we found no viable overloaded operator or we matched a 1762 // built-in operator. In either case, fall through to trying to 1763 // build a built-in operation. 1764 } 1765 1766 // Perform default conversions. 1767 DefaultFunctionArrayConversion(LHSExp); 1768 DefaultFunctionArrayConversion(RHSExp); 1769 1770 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1771 1772 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1773 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1774 // in the subscript position. As a result, we need to derive the array base 1775 // and index from the expression types. 1776 Expr *BaseExpr, *IndexExpr; 1777 QualType ResultType; 1778 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1779 BaseExpr = LHSExp; 1780 IndexExpr = RHSExp; 1781 ResultType = Context.DependentTy; 1782 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1783 BaseExpr = LHSExp; 1784 IndexExpr = RHSExp; 1785 ResultType = PTy->getPointeeType(); 1786 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1787 // Handle the uncommon case of "123[Ptr]". 1788 BaseExpr = RHSExp; 1789 IndexExpr = LHSExp; 1790 ResultType = PTy->getPointeeType(); 1791 } else if (const ObjCObjectPointerType *PTy = 1792 LHSTy->getAs<ObjCObjectPointerType>()) { 1793 BaseExpr = LHSExp; 1794 IndexExpr = RHSExp; 1795 ResultType = PTy->getPointeeType(); 1796 } else if (const ObjCObjectPointerType *PTy = 1797 RHSTy->getAs<ObjCObjectPointerType>()) { 1798 // Handle the uncommon case of "123[Ptr]". 1799 BaseExpr = RHSExp; 1800 IndexExpr = LHSExp; 1801 ResultType = PTy->getPointeeType(); 1802 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) { 1803 BaseExpr = LHSExp; // vectors: V[123] 1804 IndexExpr = RHSExp; 1805 1806 // FIXME: need to deal with const... 1807 ResultType = VTy->getElementType(); 1808 } else if (LHSTy->isArrayType()) { 1809 // If we see an array that wasn't promoted by 1810 // DefaultFunctionArrayConversion, it must be an array that 1811 // wasn't promoted because of the C90 rule that doesn't 1812 // allow promoting non-lvalue arrays. Warn, then 1813 // force the promotion here. 1814 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1815 LHSExp->getSourceRange(); 1816 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1817 LHSTy = LHSExp->getType(); 1818 1819 BaseExpr = LHSExp; 1820 IndexExpr = RHSExp; 1821 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1822 } else if (RHSTy->isArrayType()) { 1823 // Same as previous, except for 123[f().a] case 1824 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1825 RHSExp->getSourceRange(); 1826 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1827 RHSTy = RHSExp->getType(); 1828 1829 BaseExpr = RHSExp; 1830 IndexExpr = LHSExp; 1831 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1832 } else { 1833 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1834 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1835 } 1836 // C99 6.5.2.1p1 1837 if (!(IndexExpr->getType()->isIntegerType() && 1838 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1839 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1840 << IndexExpr->getSourceRange()); 1841 1842 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || 1843 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) 1844 && !IndexExpr->isTypeDependent()) 1845 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange(); 1846 1847 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1848 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1849 // type. Note that Functions are not objects, and that (in C99 parlance) 1850 // incomplete types are not object types. 1851 if (ResultType->isFunctionType()) { 1852 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1853 << ResultType << BaseExpr->getSourceRange(); 1854 return ExprError(); 1855 } 1856 1857 if (!ResultType->isDependentType() && 1858 RequireCompleteType(LLoc, ResultType, 1859 PDiag(diag::err_subscript_incomplete_type) 1860 << BaseExpr->getSourceRange())) 1861 return ExprError(); 1862 1863 // Diagnose bad cases where we step over interface counts. 1864 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1865 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1866 << ResultType << BaseExpr->getSourceRange(); 1867 return ExprError(); 1868 } 1869 1870 Base.release(); 1871 Idx.release(); 1872 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1873 ResultType, RLoc)); 1874} 1875 1876QualType Sema:: 1877CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1878 const IdentifierInfo *CompName, 1879 SourceLocation CompLoc) { 1880 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>(); 1881 1882 // The vector accessor can't exceed the number of elements. 1883 const char *compStr = CompName->getName(); 1884 1885 // This flag determines whether or not the component is one of the four 1886 // special names that indicate a subset of exactly half the elements are 1887 // to be selected. 1888 bool HalvingSwizzle = false; 1889 1890 // This flag determines whether or not CompName has an 's' char prefix, 1891 // indicating that it is a string of hex values to be used as vector indices. 1892 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1893 1894 // Check that we've found one of the special components, or that the component 1895 // names must come from the same set. 1896 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1897 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1898 HalvingSwizzle = true; 1899 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1900 do 1901 compStr++; 1902 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1903 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1904 do 1905 compStr++; 1906 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1907 } 1908 1909 if (!HalvingSwizzle && *compStr) { 1910 // We didn't get to the end of the string. This means the component names 1911 // didn't come from the same set *or* we encountered an illegal name. 1912 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1913 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1914 return QualType(); 1915 } 1916 1917 // Ensure no component accessor exceeds the width of the vector type it 1918 // operates on. 1919 if (!HalvingSwizzle) { 1920 compStr = CompName->getName(); 1921 1922 if (HexSwizzle) 1923 compStr++; 1924 1925 while (*compStr) { 1926 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1927 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1928 << baseType << SourceRange(CompLoc); 1929 return QualType(); 1930 } 1931 } 1932 } 1933 1934 // If this is a halving swizzle, verify that the base type has an even 1935 // number of elements. 1936 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1937 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1938 << baseType << SourceRange(CompLoc); 1939 return QualType(); 1940 } 1941 1942 // The component accessor looks fine - now we need to compute the actual type. 1943 // The vector type is implied by the component accessor. For example, 1944 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1945 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1946 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1947 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1948 : CompName->getLength(); 1949 if (HexSwizzle) 1950 CompSize--; 1951 1952 if (CompSize == 1) 1953 return vecType->getElementType(); 1954 1955 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1956 // Now look up the TypeDefDecl from the vector type. Without this, 1957 // diagostics look bad. We want extended vector types to appear built-in. 1958 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1959 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1960 return Context.getTypedefType(ExtVectorDecls[i]); 1961 } 1962 return VT; // should never get here (a typedef type should always be found). 1963} 1964 1965static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1966 IdentifierInfo *Member, 1967 const Selector &Sel, 1968 ASTContext &Context) { 1969 1970 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1971 return PD; 1972 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1973 return OMD; 1974 1975 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1976 E = PDecl->protocol_end(); I != E; ++I) { 1977 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1978 Context)) 1979 return D; 1980 } 1981 return 0; 1982} 1983 1984static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1985 IdentifierInfo *Member, 1986 const Selector &Sel, 1987 ASTContext &Context) { 1988 // Check protocols on qualified interfaces. 1989 Decl *GDecl = 0; 1990 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1991 E = QIdTy->qual_end(); I != E; ++I) { 1992 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1993 GDecl = PD; 1994 break; 1995 } 1996 // Also must look for a getter name which uses property syntax. 1997 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1998 GDecl = OMD; 1999 break; 2000 } 2001 } 2002 if (!GDecl) { 2003 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2004 E = QIdTy->qual_end(); I != E; ++I) { 2005 // Search in the protocol-qualifier list of current protocol. 2006 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2007 if (GDecl) 2008 return GDecl; 2009 } 2010 } 2011 return GDecl; 2012} 2013 2014Action::OwningExprResult 2015Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2016 tok::TokenKind OpKind, SourceLocation MemberLoc, 2017 DeclarationName MemberName, 2018 bool HasExplicitTemplateArgs, 2019 SourceLocation LAngleLoc, 2020 const TemplateArgument *ExplicitTemplateArgs, 2021 unsigned NumExplicitTemplateArgs, 2022 SourceLocation RAngleLoc, 2023 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 2024 NamedDecl *FirstQualifierInScope) { 2025 if (SS && SS->isInvalid()) 2026 return ExprError(); 2027 2028 // Since this might be a postfix expression, get rid of ParenListExprs. 2029 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 2030 2031 Expr *BaseExpr = Base.takeAs<Expr>(); 2032 assert(BaseExpr && "no base expression"); 2033 2034 // Perform default conversions. 2035 DefaultFunctionArrayConversion(BaseExpr); 2036 2037 QualType BaseType = BaseExpr->getType(); 2038 // If this is an Objective-C pseudo-builtin and a definition is provided then 2039 // use that. 2040 if (BaseType->isObjCIdType()) { 2041 // We have an 'id' type. Rather than fall through, we check if this 2042 // is a reference to 'isa'. 2043 if (BaseType != Context.ObjCIdRedefinitionType) { 2044 BaseType = Context.ObjCIdRedefinitionType; 2045 ImpCastExprToType(BaseExpr, BaseType); 2046 } 2047 } 2048 assert(!BaseType.isNull() && "no type for member expression"); 2049 2050 // Handle properties on ObjC 'Class' types. 2051 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2052 // Also must look for a getter name which uses property syntax. 2053 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2054 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2055 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2056 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2057 ObjCMethodDecl *Getter; 2058 // FIXME: need to also look locally in the implementation. 2059 if ((Getter = IFace->lookupClassMethod(Sel))) { 2060 // Check the use of this method. 2061 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2062 return ExprError(); 2063 } 2064 // If we found a getter then this may be a valid dot-reference, we 2065 // will look for the matching setter, in case it is needed. 2066 Selector SetterSel = 2067 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2068 PP.getSelectorTable(), Member); 2069 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2070 if (!Setter) { 2071 // If this reference is in an @implementation, also check for 'private' 2072 // methods. 2073 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 2074 } 2075 // Look through local category implementations associated with the class. 2076 if (!Setter) 2077 Setter = IFace->getCategoryClassMethod(SetterSel); 2078 2079 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2080 return ExprError(); 2081 2082 if (Getter || Setter) { 2083 QualType PType; 2084 2085 if (Getter) 2086 PType = Getter->getResultType(); 2087 else 2088 // Get the expression type from Setter's incoming parameter. 2089 PType = (*(Setter->param_end() -1))->getType(); 2090 // FIXME: we must check that the setter has property type. 2091 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, 2092 PType, 2093 Setter, MemberLoc, BaseExpr)); 2094 } 2095 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2096 << MemberName << BaseType); 2097 } 2098 } 2099 2100 if (BaseType->isObjCClassType() && 2101 BaseType != Context.ObjCClassRedefinitionType) { 2102 BaseType = Context.ObjCClassRedefinitionType; 2103 ImpCastExprToType(BaseExpr, BaseType); 2104 } 2105 2106 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2107 // must have pointer type, and the accessed type is the pointee. 2108 if (OpKind == tok::arrow) { 2109 if (BaseType->isDependentType()) { 2110 NestedNameSpecifier *Qualifier = 0; 2111 if (SS) { 2112 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2113 if (!FirstQualifierInScope) 2114 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2115 } 2116 2117 return Owned(CXXUnresolvedMemberExpr::Create(Context, BaseExpr, true, 2118 OpLoc, Qualifier, 2119 SS? SS->getRange() : SourceRange(), 2120 FirstQualifierInScope, 2121 MemberName, 2122 MemberLoc, 2123 HasExplicitTemplateArgs, 2124 LAngleLoc, 2125 ExplicitTemplateArgs, 2126 NumExplicitTemplateArgs, 2127 RAngleLoc)); 2128 } 2129 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2130 BaseType = PT->getPointeeType(); 2131 else if (BaseType->isObjCObjectPointerType()) 2132 ; 2133 else 2134 return ExprError(Diag(MemberLoc, 2135 diag::err_typecheck_member_reference_arrow) 2136 << BaseType << BaseExpr->getSourceRange()); 2137 } else if (BaseType->isDependentType()) { 2138 // Require that the base type isn't a pointer type 2139 // (so we'll report an error for) 2140 // T* t; 2141 // t.f; 2142 // 2143 // In Obj-C++, however, the above expression is valid, since it could be 2144 // accessing the 'f' property if T is an Obj-C interface. The extra check 2145 // allows this, while still reporting an error if T is a struct pointer. 2146 const PointerType *PT = BaseType->getAs<PointerType>(); 2147 2148 if (!PT || (getLangOptions().ObjC1 && 2149 !PT->getPointeeType()->isRecordType())) { 2150 NestedNameSpecifier *Qualifier = 0; 2151 if (SS) { 2152 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2153 if (!FirstQualifierInScope) 2154 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2155 } 2156 2157 return Owned(CXXUnresolvedMemberExpr::Create(Context, 2158 BaseExpr, false, 2159 OpLoc, 2160 Qualifier, 2161 SS? SS->getRange() : SourceRange(), 2162 FirstQualifierInScope, 2163 MemberName, 2164 MemberLoc, 2165 HasExplicitTemplateArgs, 2166 LAngleLoc, 2167 ExplicitTemplateArgs, 2168 NumExplicitTemplateArgs, 2169 RAngleLoc)); 2170 } 2171 } 2172 2173 // Handle field access to simple records. This also handles access to fields 2174 // of the ObjC 'id' struct. 2175 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2176 RecordDecl *RDecl = RTy->getDecl(); 2177 if (RequireCompleteType(OpLoc, BaseType, 2178 PDiag(diag::err_typecheck_incomplete_tag) 2179 << BaseExpr->getSourceRange())) 2180 return ExprError(); 2181 2182 DeclContext *DC = RDecl; 2183 if (SS && SS->isSet()) { 2184 // If the member name was a qualified-id, look into the 2185 // nested-name-specifier. 2186 DC = computeDeclContext(*SS, false); 2187 2188 // FIXME: If DC is not computable, we should build a 2189 // CXXUnresolvedMemberExpr. 2190 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2191 } 2192 2193 // The record definition is complete, now make sure the member is valid. 2194 LookupResult Result; 2195 LookupQualifiedName(Result, DC, MemberName, LookupMemberName, false); 2196 2197 if (Result.empty()) 2198 return ExprError(Diag(MemberLoc, diag::err_no_member) 2199 << MemberName << DC << BaseExpr->getSourceRange()); 2200 if (Result.isAmbiguous()) { 2201 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2202 BaseExpr->getSourceRange()); 2203 return ExprError(); 2204 } 2205 2206 NamedDecl *MemberDecl = Result.getAsSingleDecl(Context); 2207 2208 if (SS && SS->isSet()) { 2209 TypeDecl* TyD = cast<TypeDecl>(MemberDecl->getDeclContext()); 2210 QualType BaseTypeCanon 2211 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2212 QualType MemberTypeCanon 2213 = Context.getCanonicalType(Context.getTypeDeclType(TyD)); 2214 2215 if (BaseTypeCanon != MemberTypeCanon && 2216 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2217 return ExprError(Diag(SS->getBeginLoc(), 2218 diag::err_not_direct_base_or_virtual) 2219 << MemberTypeCanon << BaseTypeCanon); 2220 } 2221 2222 // If the decl being referenced had an error, return an error for this 2223 // sub-expr without emitting another error, in order to avoid cascading 2224 // error cases. 2225 if (MemberDecl->isInvalidDecl()) 2226 return ExprError(); 2227 2228 bool ShouldCheckUse = true; 2229 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { 2230 // Don't diagnose the use of a virtual member function unless it's 2231 // explicitly qualified. 2232 if (MD->isVirtual() && (!SS || !SS->isSet())) 2233 ShouldCheckUse = false; 2234 } 2235 2236 // Check the use of this field 2237 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2238 return ExprError(); 2239 2240 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2241 // We may have found a field within an anonymous union or struct 2242 // (C++ [class.union]). 2243 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2244 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2245 BaseExpr, OpLoc); 2246 2247 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2248 QualType MemberType = FD->getType(); 2249 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2250 MemberType = Ref->getPointeeType(); 2251 else { 2252 Qualifiers BaseQuals = BaseType.getQualifiers(); 2253 BaseQuals.removeObjCGCAttr(); 2254 if (FD->isMutable()) BaseQuals.removeConst(); 2255 2256 Qualifiers MemberQuals 2257 = Context.getCanonicalType(MemberType).getQualifiers(); 2258 2259 Qualifiers Combined = BaseQuals + MemberQuals; 2260 if (Combined != MemberQuals) 2261 MemberType = Context.getQualifiedType(MemberType, Combined); 2262 } 2263 2264 MarkDeclarationReferenced(MemberLoc, FD); 2265 if (PerformObjectMemberConversion(BaseExpr, FD)) 2266 return ExprError(); 2267 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2268 FD, MemberLoc, MemberType)); 2269 } 2270 2271 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2272 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2273 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2274 Var, MemberLoc, 2275 Var->getType().getNonReferenceType())); 2276 } 2277 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2278 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2279 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2280 MemberFn, MemberLoc, 2281 MemberFn->getType())); 2282 } 2283 if (FunctionTemplateDecl *FunTmpl 2284 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2285 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2286 2287 if (HasExplicitTemplateArgs) 2288 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2289 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2290 SS? SS->getRange() : SourceRange(), 2291 FunTmpl, MemberLoc, true, 2292 LAngleLoc, ExplicitTemplateArgs, 2293 NumExplicitTemplateArgs, RAngleLoc, 2294 Context.OverloadTy)); 2295 2296 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2297 FunTmpl, MemberLoc, 2298 Context.OverloadTy)); 2299 } 2300 if (OverloadedFunctionDecl *Ovl 2301 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2302 if (HasExplicitTemplateArgs) 2303 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2304 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2305 SS? SS->getRange() : SourceRange(), 2306 Ovl, MemberLoc, true, 2307 LAngleLoc, ExplicitTemplateArgs, 2308 NumExplicitTemplateArgs, RAngleLoc, 2309 Context.OverloadTy)); 2310 2311 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2312 Ovl, MemberLoc, Context.OverloadTy)); 2313 } 2314 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2315 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2316 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2317 Enum, MemberLoc, Enum->getType())); 2318 } 2319 if (isa<TypeDecl>(MemberDecl)) 2320 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2321 << MemberName << int(OpKind == tok::arrow)); 2322 2323 // We found a declaration kind that we didn't expect. This is a 2324 // generic error message that tells the user that she can't refer 2325 // to this member with '.' or '->'. 2326 return ExprError(Diag(MemberLoc, 2327 diag::err_typecheck_member_reference_unknown) 2328 << MemberName << int(OpKind == tok::arrow)); 2329 } 2330 2331 // Handle pseudo-destructors (C++ [expr.pseudo]). Since anything referring 2332 // into a record type was handled above, any destructor we see here is a 2333 // pseudo-destructor. 2334 if (MemberName.getNameKind() == DeclarationName::CXXDestructorName) { 2335 // C++ [expr.pseudo]p2: 2336 // The left hand side of the dot operator shall be of scalar type. The 2337 // left hand side of the arrow operator shall be of pointer to scalar 2338 // type. 2339 if (!BaseType->isScalarType()) 2340 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 2341 << BaseType << BaseExpr->getSourceRange()); 2342 2343 // [...] The type designated by the pseudo-destructor-name shall be the 2344 // same as the object type. 2345 if (!MemberName.getCXXNameType()->isDependentType() && 2346 !Context.hasSameUnqualifiedType(BaseType, MemberName.getCXXNameType())) 2347 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_type_mismatch) 2348 << BaseType << MemberName.getCXXNameType() 2349 << BaseExpr->getSourceRange() << SourceRange(MemberLoc)); 2350 2351 // [...] Furthermore, the two type-names in a pseudo-destructor-name of 2352 // the form 2353 // 2354 // ::[opt] nested-name-specifier[opt] type-name :: ̃ type-name 2355 // 2356 // shall designate the same scalar type. 2357 // 2358 // FIXME: DPG can't see any way to trigger this particular clause, so it 2359 // isn't checked here. 2360 2361 // FIXME: We've lost the precise spelling of the type by going through 2362 // DeclarationName. Can we do better? 2363 return Owned(new (Context) CXXPseudoDestructorExpr(Context, BaseExpr, 2364 OpKind == tok::arrow, 2365 OpLoc, 2366 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2367 SS? SS->getRange() : SourceRange(), 2368 MemberName.getCXXNameType(), 2369 MemberLoc)); 2370 } 2371 2372 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2373 // (*Obj).ivar. 2374 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2375 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2376 const ObjCObjectPointerType *OPT = BaseType->getAs<ObjCObjectPointerType>(); 2377 const ObjCInterfaceType *IFaceT = 2378 OPT ? OPT->getInterfaceType() : BaseType->getAs<ObjCInterfaceType>(); 2379 if (IFaceT) { 2380 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2381 2382 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2383 ObjCInterfaceDecl *ClassDeclared; 2384 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2385 2386 if (IV) { 2387 // If the decl being referenced had an error, return an error for this 2388 // sub-expr without emitting another error, in order to avoid cascading 2389 // error cases. 2390 if (IV->isInvalidDecl()) 2391 return ExprError(); 2392 2393 // Check whether we can reference this field. 2394 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2395 return ExprError(); 2396 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2397 IV->getAccessControl() != ObjCIvarDecl::Package) { 2398 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2399 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2400 ClassOfMethodDecl = MD->getClassInterface(); 2401 else if (ObjCImpDecl && getCurFunctionDecl()) { 2402 // Case of a c-function declared inside an objc implementation. 2403 // FIXME: For a c-style function nested inside an objc implementation 2404 // class, there is no implementation context available, so we pass 2405 // down the context as argument to this routine. Ideally, this context 2406 // need be passed down in the AST node and somehow calculated from the 2407 // AST for a function decl. 2408 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2409 if (ObjCImplementationDecl *IMPD = 2410 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2411 ClassOfMethodDecl = IMPD->getClassInterface(); 2412 else if (ObjCCategoryImplDecl* CatImplClass = 2413 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2414 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2415 } 2416 2417 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2418 if (ClassDeclared != IDecl || 2419 ClassOfMethodDecl != ClassDeclared) 2420 Diag(MemberLoc, diag::error_private_ivar_access) 2421 << IV->getDeclName(); 2422 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2423 // @protected 2424 Diag(MemberLoc, diag::error_protected_ivar_access) 2425 << IV->getDeclName(); 2426 } 2427 2428 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2429 MemberLoc, BaseExpr, 2430 OpKind == tok::arrow)); 2431 } 2432 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2433 << IDecl->getDeclName() << MemberName 2434 << BaseExpr->getSourceRange()); 2435 } 2436 } 2437 // Handle properties on 'id' and qualified "id". 2438 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2439 BaseType->isObjCQualifiedIdType())) { 2440 const ObjCObjectPointerType *QIdTy = BaseType->getAs<ObjCObjectPointerType>(); 2441 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2442 2443 // Check protocols on qualified interfaces. 2444 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2445 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2446 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2447 // Check the use of this declaration 2448 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2449 return ExprError(); 2450 2451 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2452 MemberLoc, BaseExpr)); 2453 } 2454 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2455 // Check the use of this method. 2456 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2457 return ExprError(); 2458 2459 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2460 OMD->getResultType(), 2461 OMD, OpLoc, MemberLoc, 2462 NULL, 0)); 2463 } 2464 } 2465 2466 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2467 << MemberName << BaseType); 2468 } 2469 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2470 // pointer to a (potentially qualified) interface type. 2471 const ObjCObjectPointerType *OPT; 2472 if (OpKind == tok::period && 2473 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2474 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2475 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2476 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2477 2478 // Search for a declared property first. 2479 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2480 // Check whether we can reference this property. 2481 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2482 return ExprError(); 2483 QualType ResTy = PD->getType(); 2484 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2485 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2486 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2487 ResTy = Getter->getResultType(); 2488 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2489 MemberLoc, BaseExpr)); 2490 } 2491 // Check protocols on qualified interfaces. 2492 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2493 E = OPT->qual_end(); I != E; ++I) 2494 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2495 // Check whether we can reference this property. 2496 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2497 return ExprError(); 2498 2499 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2500 MemberLoc, BaseExpr)); 2501 } 2502 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2503 E = OPT->qual_end(); I != E; ++I) 2504 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2505 // Check whether we can reference this property. 2506 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2507 return ExprError(); 2508 2509 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2510 MemberLoc, BaseExpr)); 2511 } 2512 // If that failed, look for an "implicit" property by seeing if the nullary 2513 // selector is implemented. 2514 2515 // FIXME: The logic for looking up nullary and unary selectors should be 2516 // shared with the code in ActOnInstanceMessage. 2517 2518 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2519 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2520 2521 // If this reference is in an @implementation, check for 'private' methods. 2522 if (!Getter) 2523 Getter = IFace->lookupPrivateInstanceMethod(Sel); 2524 2525 // Look through local category implementations associated with the class. 2526 if (!Getter) 2527 Getter = IFace->getCategoryInstanceMethod(Sel); 2528 if (Getter) { 2529 // Check if we can reference this property. 2530 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2531 return ExprError(); 2532 } 2533 // If we found a getter then this may be a valid dot-reference, we 2534 // will look for the matching setter, in case it is needed. 2535 Selector SetterSel = 2536 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2537 PP.getSelectorTable(), Member); 2538 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2539 if (!Setter) { 2540 // If this reference is in an @implementation, also check for 'private' 2541 // methods. 2542 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 2543 } 2544 // Look through local category implementations associated with the class. 2545 if (!Setter) 2546 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2547 2548 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2549 return ExprError(); 2550 2551 if (Getter || Setter) { 2552 QualType PType; 2553 2554 if (Getter) 2555 PType = Getter->getResultType(); 2556 else 2557 // Get the expression type from Setter's incoming parameter. 2558 PType = (*(Setter->param_end() -1))->getType(); 2559 // FIXME: we must check that the setter has property type. 2560 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2561 Setter, MemberLoc, BaseExpr)); 2562 } 2563 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2564 << MemberName << BaseType); 2565 } 2566 2567 // Handle the following exceptional case (*Obj).isa. 2568 if (OpKind == tok::period && 2569 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2570 MemberName.getAsIdentifierInfo()->isStr("isa")) 2571 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2572 Context.getObjCIdType())); 2573 2574 // Handle 'field access' to vectors, such as 'V.xx'. 2575 if (BaseType->isExtVectorType()) { 2576 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2577 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2578 if (ret.isNull()) 2579 return ExprError(); 2580 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2581 MemberLoc)); 2582 } 2583 2584 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2585 << BaseType << BaseExpr->getSourceRange(); 2586 2587 // If the user is trying to apply -> or . to a function or function 2588 // pointer, it's probably because they forgot parentheses to call 2589 // the function. Suggest the addition of those parentheses. 2590 if (BaseType == Context.OverloadTy || 2591 BaseType->isFunctionType() || 2592 (BaseType->isPointerType() && 2593 BaseType->getAs<PointerType>()->isFunctionType())) { 2594 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2595 Diag(Loc, diag::note_member_reference_needs_call) 2596 << CodeModificationHint::CreateInsertion(Loc, "()"); 2597 } 2598 2599 return ExprError(); 2600} 2601 2602Action::OwningExprResult 2603Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2604 tok::TokenKind OpKind, SourceLocation MemberLoc, 2605 IdentifierInfo &Member, 2606 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2607 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2608 DeclarationName(&Member), ObjCImpDecl, SS); 2609} 2610 2611Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2612 FunctionDecl *FD, 2613 ParmVarDecl *Param) { 2614 if (Param->hasUnparsedDefaultArg()) { 2615 Diag (CallLoc, 2616 diag::err_use_of_default_argument_to_function_declared_later) << 2617 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2618 Diag(UnparsedDefaultArgLocs[Param], 2619 diag::note_default_argument_declared_here); 2620 } else { 2621 if (Param->hasUninstantiatedDefaultArg()) { 2622 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2623 2624 // Instantiate the expression. 2625 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2626 2627 InstantiatingTemplate Inst(*this, CallLoc, Param, 2628 ArgList.getInnermost().getFlatArgumentList(), 2629 ArgList.getInnermost().flat_size()); 2630 2631 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2632 if (Result.isInvalid()) 2633 return ExprError(); 2634 2635 if (SetParamDefaultArgument(Param, move(Result), 2636 /*FIXME:EqualLoc*/ 2637 UninstExpr->getSourceRange().getBegin())) 2638 return ExprError(); 2639 } 2640 2641 Expr *DefaultExpr = Param->getDefaultArg(); 2642 2643 // If the default expression creates temporaries, we need to 2644 // push them to the current stack of expression temporaries so they'll 2645 // be properly destroyed. 2646 if (CXXExprWithTemporaries *E 2647 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2648 assert(!E->shouldDestroyTemporaries() && 2649 "Can't destroy temporaries in a default argument expr!"); 2650 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2651 ExprTemporaries.push_back(E->getTemporary(I)); 2652 } 2653 } 2654 2655 // We already type-checked the argument, so we know it works. 2656 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2657} 2658 2659/// ConvertArgumentsForCall - Converts the arguments specified in 2660/// Args/NumArgs to the parameter types of the function FDecl with 2661/// function prototype Proto. Call is the call expression itself, and 2662/// Fn is the function expression. For a C++ member function, this 2663/// routine does not attempt to convert the object argument. Returns 2664/// true if the call is ill-formed. 2665bool 2666Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2667 FunctionDecl *FDecl, 2668 const FunctionProtoType *Proto, 2669 Expr **Args, unsigned NumArgs, 2670 SourceLocation RParenLoc) { 2671 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2672 // assignment, to the types of the corresponding parameter, ... 2673 unsigned NumArgsInProto = Proto->getNumArgs(); 2674 unsigned NumArgsToCheck = NumArgs; 2675 bool Invalid = false; 2676 2677 // If too few arguments are available (and we don't have default 2678 // arguments for the remaining parameters), don't make the call. 2679 if (NumArgs < NumArgsInProto) { 2680 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2681 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2682 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2683 // Use default arguments for missing arguments 2684 NumArgsToCheck = NumArgsInProto; 2685 Call->setNumArgs(Context, NumArgsInProto); 2686 } 2687 2688 // If too many are passed and not variadic, error on the extras and drop 2689 // them. 2690 if (NumArgs > NumArgsInProto) { 2691 if (!Proto->isVariadic()) { 2692 Diag(Args[NumArgsInProto]->getLocStart(), 2693 diag::err_typecheck_call_too_many_args) 2694 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2695 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2696 Args[NumArgs-1]->getLocEnd()); 2697 // This deletes the extra arguments. 2698 Call->setNumArgs(Context, NumArgsInProto); 2699 Invalid = true; 2700 } 2701 NumArgsToCheck = NumArgsInProto; 2702 } 2703 2704 // Continue to check argument types (even if we have too few/many args). 2705 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2706 QualType ProtoArgType = Proto->getArgType(i); 2707 2708 Expr *Arg; 2709 if (i < NumArgs) { 2710 Arg = Args[i]; 2711 2712 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2713 ProtoArgType, 2714 PDiag(diag::err_call_incomplete_argument) 2715 << Arg->getSourceRange())) 2716 return true; 2717 2718 // Pass the argument. 2719 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2720 return true; 2721 } else { 2722 ParmVarDecl *Param = FDecl->getParamDecl(i); 2723 2724 OwningExprResult ArgExpr = 2725 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2726 FDecl, Param); 2727 if (ArgExpr.isInvalid()) 2728 return true; 2729 2730 Arg = ArgExpr.takeAs<Expr>(); 2731 } 2732 2733 Call->setArg(i, Arg); 2734 } 2735 2736 // If this is a variadic call, handle args passed through "...". 2737 if (Proto->isVariadic()) { 2738 VariadicCallType CallType = VariadicFunction; 2739 if (Fn->getType()->isBlockPointerType()) 2740 CallType = VariadicBlock; // Block 2741 else if (isa<MemberExpr>(Fn)) 2742 CallType = VariadicMethod; 2743 2744 // Promote the arguments (C99 6.5.2.2p7). 2745 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2746 Expr *Arg = Args[i]; 2747 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2748 Call->setArg(i, Arg); 2749 } 2750 } 2751 2752 return Invalid; 2753} 2754 2755/// \brief "Deconstruct" the function argument of a call expression to find 2756/// the underlying declaration (if any), the name of the called function, 2757/// whether argument-dependent lookup is available, whether it has explicit 2758/// template arguments, etc. 2759void Sema::DeconstructCallFunction(Expr *FnExpr, 2760 NamedDecl *&Function, 2761 DeclarationName &Name, 2762 NestedNameSpecifier *&Qualifier, 2763 SourceRange &QualifierRange, 2764 bool &ArgumentDependentLookup, 2765 bool &HasExplicitTemplateArguments, 2766 const TemplateArgument *&ExplicitTemplateArgs, 2767 unsigned &NumExplicitTemplateArgs) { 2768 // Set defaults for all of the output parameters. 2769 Function = 0; 2770 Name = DeclarationName(); 2771 Qualifier = 0; 2772 QualifierRange = SourceRange(); 2773 ArgumentDependentLookup = getLangOptions().CPlusPlus; 2774 HasExplicitTemplateArguments = false; 2775 2776 // If we're directly calling a function, get the appropriate declaration. 2777 // Also, in C++, keep track of whether we should perform argument-dependent 2778 // lookup and whether there were any explicitly-specified template arguments. 2779 while (true) { 2780 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2781 FnExpr = IcExpr->getSubExpr(); 2782 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2783 // Parentheses around a function disable ADL 2784 // (C++0x [basic.lookup.argdep]p1). 2785 ArgumentDependentLookup = false; 2786 FnExpr = PExpr->getSubExpr(); 2787 } else if (isa<UnaryOperator>(FnExpr) && 2788 cast<UnaryOperator>(FnExpr)->getOpcode() 2789 == UnaryOperator::AddrOf) { 2790 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2791 } else if (QualifiedDeclRefExpr *QDRExpr 2792 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) { 2793 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2794 ArgumentDependentLookup = false; 2795 Qualifier = QDRExpr->getQualifier(); 2796 QualifierRange = QDRExpr->getQualifierRange(); 2797 Function = dyn_cast<NamedDecl>(QDRExpr->getDecl()); 2798 break; 2799 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2800 Function = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2801 break; 2802 } else if (UnresolvedFunctionNameExpr *DepName 2803 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2804 Name = DepName->getName(); 2805 break; 2806 } else if (TemplateIdRefExpr *TemplateIdRef 2807 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2808 Function = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2809 if (!Function) 2810 Function = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2811 HasExplicitTemplateArguments = true; 2812 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2813 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2814 2815 // C++ [temp.arg.explicit]p6: 2816 // [Note: For simple function names, argument dependent lookup (3.4.2) 2817 // applies even when the function name is not visible within the 2818 // scope of the call. This is because the call still has the syntactic 2819 // form of a function call (3.4.1). But when a function template with 2820 // explicit template arguments is used, the call does not have the 2821 // correct syntactic form unless there is a function template with 2822 // that name visible at the point of the call. If no such name is 2823 // visible, the call is not syntactically well-formed and 2824 // argument-dependent lookup does not apply. If some such name is 2825 // visible, argument dependent lookup applies and additional function 2826 // templates may be found in other namespaces. 2827 // 2828 // The summary of this paragraph is that, if we get to this point and the 2829 // template-id was not a qualified name, then argument-dependent lookup 2830 // is still possible. 2831 if ((Qualifier = TemplateIdRef->getQualifier())) { 2832 ArgumentDependentLookup = false; 2833 QualifierRange = TemplateIdRef->getQualifierRange(); 2834 } 2835 break; 2836 } else { 2837 // Any kind of name that does not refer to a declaration (or 2838 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2839 ArgumentDependentLookup = false; 2840 break; 2841 } 2842 } 2843} 2844 2845/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2846/// This provides the location of the left/right parens and a list of comma 2847/// locations. 2848Action::OwningExprResult 2849Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2850 MultiExprArg args, 2851 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2852 unsigned NumArgs = args.size(); 2853 2854 // Since this might be a postfix expression, get rid of ParenListExprs. 2855 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2856 2857 Expr *Fn = fn.takeAs<Expr>(); 2858 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2859 assert(Fn && "no function call expression"); 2860 FunctionDecl *FDecl = NULL; 2861 NamedDecl *NDecl = NULL; 2862 DeclarationName UnqualifiedName; 2863 2864 if (getLangOptions().CPlusPlus) { 2865 // If this is a pseudo-destructor expression, build the call immediately. 2866 if (isa<CXXPseudoDestructorExpr>(Fn)) { 2867 if (NumArgs > 0) { 2868 // Pseudo-destructor calls should not have any arguments. 2869 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args) 2870 << CodeModificationHint::CreateRemoval( 2871 SourceRange(Args[0]->getLocStart(), 2872 Args[NumArgs-1]->getLocEnd())); 2873 2874 for (unsigned I = 0; I != NumArgs; ++I) 2875 Args[I]->Destroy(Context); 2876 2877 NumArgs = 0; 2878 } 2879 2880 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy, 2881 RParenLoc)); 2882 } 2883 2884 // Determine whether this is a dependent call inside a C++ template, 2885 // in which case we won't do any semantic analysis now. 2886 // FIXME: Will need to cache the results of name lookup (including ADL) in 2887 // Fn. 2888 bool Dependent = false; 2889 if (Fn->isTypeDependent()) 2890 Dependent = true; 2891 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2892 Dependent = true; 2893 2894 if (Dependent) 2895 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2896 Context.DependentTy, RParenLoc)); 2897 2898 // Determine whether this is a call to an object (C++ [over.call.object]). 2899 if (Fn->getType()->isRecordType()) 2900 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2901 CommaLocs, RParenLoc)); 2902 2903 // Determine whether this is a call to a member function. 2904 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2905 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2906 if (isa<OverloadedFunctionDecl>(MemDecl) || 2907 isa<CXXMethodDecl>(MemDecl) || 2908 (isa<FunctionTemplateDecl>(MemDecl) && 2909 isa<CXXMethodDecl>( 2910 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2911 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2912 CommaLocs, RParenLoc)); 2913 } 2914 2915 // Determine whether this is a call to a pointer-to-member function. 2916 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Fn->IgnoreParens())) { 2917 if (BO->getOpcode() == BinaryOperator::PtrMemD || 2918 BO->getOpcode() == BinaryOperator::PtrMemI) { 2919 const FunctionProtoType *FPT = cast<FunctionProtoType>(BO->getType()); 2920 QualType ResultTy = FPT->getResultType().getNonReferenceType(); 2921 2922 ExprOwningPtr<CXXMemberCallExpr> 2923 TheCall(this, new (Context) CXXMemberCallExpr(Context, BO, Args, 2924 NumArgs, ResultTy, 2925 RParenLoc)); 2926 2927 if (CheckCallReturnType(FPT->getResultType(), 2928 BO->getRHS()->getSourceRange().getBegin(), 2929 TheCall.get(), 0)) 2930 return ExprError(); 2931 2932 if (ConvertArgumentsForCall(&*TheCall, BO, 0, FPT, Args, NumArgs, 2933 RParenLoc)) 2934 return ExprError(); 2935 2936 return Owned(MaybeBindToTemporary(TheCall.release()).release()); 2937 } 2938 } 2939 } 2940 2941 // If we're directly calling a function, get the appropriate declaration. 2942 // Also, in C++, keep track of whether we should perform argument-dependent 2943 // lookup and whether there were any explicitly-specified template arguments. 2944 bool ADL = true; 2945 bool HasExplicitTemplateArgs = 0; 2946 const TemplateArgument *ExplicitTemplateArgs = 0; 2947 unsigned NumExplicitTemplateArgs = 0; 2948 NestedNameSpecifier *Qualifier = 0; 2949 SourceRange QualifierRange; 2950 DeconstructCallFunction(Fn, NDecl, UnqualifiedName, Qualifier, QualifierRange, 2951 ADL,HasExplicitTemplateArgs, ExplicitTemplateArgs, 2952 NumExplicitTemplateArgs); 2953 2954 OverloadedFunctionDecl *Ovl = 0; 2955 FunctionTemplateDecl *FunctionTemplate = 0; 2956 if (NDecl) { 2957 FDecl = dyn_cast<FunctionDecl>(NDecl); 2958 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2959 FDecl = FunctionTemplate->getTemplatedDecl(); 2960 else 2961 FDecl = dyn_cast<FunctionDecl>(NDecl); 2962 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2963 } 2964 2965 if (Ovl || FunctionTemplate || 2966 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2967 // We don't perform ADL for implicit declarations of builtins. 2968 if (FDecl && FDecl->getBuiltinID() && FDecl->isImplicit()) 2969 ADL = false; 2970 2971 // We don't perform ADL in C. 2972 if (!getLangOptions().CPlusPlus) 2973 ADL = false; 2974 2975 if (Ovl || FunctionTemplate || ADL) { 2976 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2977 HasExplicitTemplateArgs, 2978 ExplicitTemplateArgs, 2979 NumExplicitTemplateArgs, 2980 LParenLoc, Args, NumArgs, CommaLocs, 2981 RParenLoc, ADL); 2982 if (!FDecl) 2983 return ExprError(); 2984 2985 // Update Fn to refer to the actual function selected. 2986 Expr *NewFn = 0; 2987 if (Qualifier) 2988 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2989 Fn->getLocStart(), 2990 false, false, 2991 QualifierRange, 2992 Qualifier); 2993 else 2994 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2995 Fn->getLocStart()); 2996 Fn->Destroy(Context); 2997 Fn = NewFn; 2998 } 2999 } 3000 3001 // Promote the function operand. 3002 UsualUnaryConversions(Fn); 3003 3004 // Make the call expr early, before semantic checks. This guarantees cleanup 3005 // of arguments and function on error. 3006 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 3007 Args, NumArgs, 3008 Context.BoolTy, 3009 RParenLoc)); 3010 3011 const FunctionType *FuncT; 3012 if (!Fn->getType()->isBlockPointerType()) { 3013 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 3014 // have type pointer to function". 3015 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 3016 if (PT == 0) 3017 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 3018 << Fn->getType() << Fn->getSourceRange()); 3019 FuncT = PT->getPointeeType()->getAs<FunctionType>(); 3020 } else { // This is a block call. 3021 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 3022 getAs<FunctionType>(); 3023 } 3024 if (FuncT == 0) 3025 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 3026 << Fn->getType() << Fn->getSourceRange()); 3027 3028 // Check for a valid return type 3029 if (CheckCallReturnType(FuncT->getResultType(), 3030 Fn->getSourceRange().getBegin(), TheCall.get(), 3031 FDecl)) 3032 return ExprError(); 3033 3034 // We know the result type of the call, set it. 3035 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 3036 3037 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 3038 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 3039 RParenLoc)) 3040 return ExprError(); 3041 } else { 3042 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 3043 3044 if (FDecl) { 3045 // Check if we have too few/too many template arguments, based 3046 // on our knowledge of the function definition. 3047 const FunctionDecl *Def = 0; 3048 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 3049 const FunctionProtoType *Proto = 3050 Def->getType()->getAs<FunctionProtoType>(); 3051 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 3052 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 3053 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 3054 } 3055 } 3056 } 3057 3058 // Promote the arguments (C99 6.5.2.2p6). 3059 for (unsigned i = 0; i != NumArgs; i++) { 3060 Expr *Arg = Args[i]; 3061 DefaultArgumentPromotion(Arg); 3062 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 3063 Arg->getType(), 3064 PDiag(diag::err_call_incomplete_argument) 3065 << Arg->getSourceRange())) 3066 return ExprError(); 3067 TheCall->setArg(i, Arg); 3068 } 3069 } 3070 3071 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 3072 if (!Method->isStatic()) 3073 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 3074 << Fn->getSourceRange()); 3075 3076 // Check for sentinels 3077 if (NDecl) 3078 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 3079 3080 // Do special checking on direct calls to functions. 3081 if (FDecl) { 3082 if (CheckFunctionCall(FDecl, TheCall.get())) 3083 return ExprError(); 3084 3085 if (unsigned BuiltinID = FDecl->getBuiltinID()) 3086 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 3087 } else if (NDecl) { 3088 if (CheckBlockCall(NDecl, TheCall.get())) 3089 return ExprError(); 3090 } 3091 3092 return MaybeBindToTemporary(TheCall.take()); 3093} 3094 3095Action::OwningExprResult 3096Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 3097 SourceLocation RParenLoc, ExprArg InitExpr) { 3098 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 3099 //FIXME: Preserve type source info. 3100 QualType literalType = GetTypeFromParser(Ty); 3101 // FIXME: put back this assert when initializers are worked out. 3102 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 3103 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 3104 3105 if (literalType->isArrayType()) { 3106 if (literalType->isVariableArrayType()) 3107 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 3108 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 3109 } else if (!literalType->isDependentType() && 3110 RequireCompleteType(LParenLoc, literalType, 3111 PDiag(diag::err_typecheck_decl_incomplete_type) 3112 << SourceRange(LParenLoc, 3113 literalExpr->getSourceRange().getEnd()))) 3114 return ExprError(); 3115 3116 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 3117 DeclarationName(), /*FIXME:DirectInit=*/false)) 3118 return ExprError(); 3119 3120 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 3121 if (isFileScope) { // 6.5.2.5p3 3122 if (CheckForConstantInitializer(literalExpr, literalType)) 3123 return ExprError(); 3124 } 3125 InitExpr.release(); 3126 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 3127 literalExpr, isFileScope)); 3128} 3129 3130Action::OwningExprResult 3131Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 3132 SourceLocation RBraceLoc) { 3133 unsigned NumInit = initlist.size(); 3134 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 3135 3136 // Semantic analysis for initializers is done by ActOnDeclarator() and 3137 // CheckInitializer() - it requires knowledge of the object being intialized. 3138 3139 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 3140 RBraceLoc); 3141 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 3142 return Owned(E); 3143} 3144 3145/// CheckCastTypes - Check type constraints for casting between types. 3146bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 3147 CastExpr::CastKind& Kind, 3148 CXXMethodDecl *& ConversionDecl, 3149 bool FunctionalStyle) { 3150 if (getLangOptions().CPlusPlus) 3151 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 3152 ConversionDecl); 3153 3154 DefaultFunctionArrayConversion(castExpr); 3155 3156 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 3157 // type needs to be scalar. 3158 if (castType->isVoidType()) { 3159 // Cast to void allows any expr type. 3160 } else if (!castType->isScalarType() && !castType->isVectorType()) { 3161 if (Context.getCanonicalType(castType).getUnqualifiedType() == 3162 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 3163 (castType->isStructureType() || castType->isUnionType())) { 3164 // GCC struct/union extension: allow cast to self. 3165 // FIXME: Check that the cast destination type is complete. 3166 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3167 << castType << castExpr->getSourceRange(); 3168 Kind = CastExpr::CK_NoOp; 3169 } else if (castType->isUnionType()) { 3170 // GCC cast to union extension 3171 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3172 RecordDecl::field_iterator Field, FieldEnd; 3173 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3174 Field != FieldEnd; ++Field) { 3175 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3176 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3177 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3178 << castExpr->getSourceRange(); 3179 break; 3180 } 3181 } 3182 if (Field == FieldEnd) 3183 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3184 << castExpr->getType() << castExpr->getSourceRange(); 3185 Kind = CastExpr::CK_ToUnion; 3186 } else { 3187 // Reject any other conversions to non-scalar types. 3188 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3189 << castType << castExpr->getSourceRange(); 3190 } 3191 } else if (!castExpr->getType()->isScalarType() && 3192 !castExpr->getType()->isVectorType()) { 3193 return Diag(castExpr->getLocStart(), 3194 diag::err_typecheck_expect_scalar_operand) 3195 << castExpr->getType() << castExpr->getSourceRange(); 3196 } else if (castType->isExtVectorType()) { 3197 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 3198 return true; 3199 } else if (castType->isVectorType()) { 3200 if (CheckVectorCast(TyR, castType, castExpr->getType())) 3201 return true; 3202 } else if (castExpr->getType()->isVectorType()) { 3203 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 3204 return true; 3205 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 3206 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3207 } else if (!castType->isArithmeticType()) { 3208 QualType castExprType = castExpr->getType(); 3209 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3210 return Diag(castExpr->getLocStart(), 3211 diag::err_cast_pointer_from_non_pointer_int) 3212 << castExprType << castExpr->getSourceRange(); 3213 } else if (!castExpr->getType()->isArithmeticType()) { 3214 if (!castType->isIntegralType() && castType->isArithmeticType()) 3215 return Diag(castExpr->getLocStart(), 3216 diag::err_cast_pointer_to_non_pointer_int) 3217 << castType << castExpr->getSourceRange(); 3218 } 3219 if (isa<ObjCSelectorExpr>(castExpr)) 3220 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3221 return false; 3222} 3223 3224bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 3225 assert(VectorTy->isVectorType() && "Not a vector type!"); 3226 3227 if (Ty->isVectorType() || Ty->isIntegerType()) { 3228 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3229 return Diag(R.getBegin(), 3230 Ty->isVectorType() ? 3231 diag::err_invalid_conversion_between_vectors : 3232 diag::err_invalid_conversion_between_vector_and_integer) 3233 << VectorTy << Ty << R; 3234 } else 3235 return Diag(R.getBegin(), 3236 diag::err_invalid_conversion_between_vector_and_scalar) 3237 << VectorTy << Ty << R; 3238 3239 return false; 3240} 3241 3242bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3243 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3244 3245 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3246 // an ExtVectorType. 3247 if (SrcTy->isVectorType()) { 3248 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3249 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3250 << DestTy << SrcTy << R; 3251 return false; 3252 } 3253 3254 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3255 // conversion will take place first from scalar to elt type, and then 3256 // splat from elt type to vector. 3257 if (SrcTy->isPointerType()) 3258 return Diag(R.getBegin(), 3259 diag::err_invalid_conversion_between_vector_and_scalar) 3260 << DestTy << SrcTy << R; 3261 return false; 3262} 3263 3264Action::OwningExprResult 3265Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3266 SourceLocation RParenLoc, ExprArg Op) { 3267 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3268 3269 assert((Ty != 0) && (Op.get() != 0) && 3270 "ActOnCastExpr(): missing type or expr"); 3271 3272 Expr *castExpr = (Expr *)Op.get(); 3273 //FIXME: Preserve type source info. 3274 QualType castType = GetTypeFromParser(Ty); 3275 3276 // If the Expr being casted is a ParenListExpr, handle it specially. 3277 if (isa<ParenListExpr>(castExpr)) 3278 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3279 CXXMethodDecl *Method = 0; 3280 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3281 Kind, Method)) 3282 return ExprError(); 3283 3284 if (Method) { 3285 OwningExprResult CastArg = BuildCXXCastArgument(LParenLoc, castType, Kind, 3286 Method, move(Op)); 3287 3288 if (CastArg.isInvalid()) 3289 return ExprError(); 3290 3291 castExpr = CastArg.takeAs<Expr>(); 3292 } else { 3293 Op.release(); 3294 } 3295 3296 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3297 Kind, castExpr, castType, 3298 LParenLoc, RParenLoc)); 3299} 3300 3301/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3302/// of comma binary operators. 3303Action::OwningExprResult 3304Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3305 Expr *expr = EA.takeAs<Expr>(); 3306 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3307 if (!E) 3308 return Owned(expr); 3309 3310 OwningExprResult Result(*this, E->getExpr(0)); 3311 3312 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3313 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3314 Owned(E->getExpr(i))); 3315 3316 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3317} 3318 3319Action::OwningExprResult 3320Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3321 SourceLocation RParenLoc, ExprArg Op, 3322 QualType Ty) { 3323 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3324 3325 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3326 // then handle it as such. 3327 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3328 if (PE->getNumExprs() == 0) { 3329 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3330 return ExprError(); 3331 } 3332 3333 llvm::SmallVector<Expr *, 8> initExprs; 3334 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3335 initExprs.push_back(PE->getExpr(i)); 3336 3337 // FIXME: This means that pretty-printing the final AST will produce curly 3338 // braces instead of the original commas. 3339 Op.release(); 3340 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3341 initExprs.size(), RParenLoc); 3342 E->setType(Ty); 3343 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3344 Owned(E)); 3345 } else { 3346 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3347 // sequence of BinOp comma operators. 3348 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3349 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3350 } 3351} 3352 3353Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3354 SourceLocation R, 3355 MultiExprArg Val) { 3356 unsigned nexprs = Val.size(); 3357 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3358 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3359 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3360 return Owned(expr); 3361} 3362 3363/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3364/// In that case, lhs = cond. 3365/// C99 6.5.15 3366QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3367 SourceLocation QuestionLoc) { 3368 // C++ is sufficiently different to merit its own checker. 3369 if (getLangOptions().CPlusPlus) 3370 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3371 3372 UsualUnaryConversions(Cond); 3373 UsualUnaryConversions(LHS); 3374 UsualUnaryConversions(RHS); 3375 QualType CondTy = Cond->getType(); 3376 QualType LHSTy = LHS->getType(); 3377 QualType RHSTy = RHS->getType(); 3378 3379 // first, check the condition. 3380 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3381 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3382 << CondTy; 3383 return QualType(); 3384 } 3385 3386 // Now check the two expressions. 3387 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3388 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3389 3390 // If both operands have arithmetic type, do the usual arithmetic conversions 3391 // to find a common type: C99 6.5.15p3,5. 3392 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3393 UsualArithmeticConversions(LHS, RHS); 3394 return LHS->getType(); 3395 } 3396 3397 // If both operands are the same structure or union type, the result is that 3398 // type. 3399 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3400 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3401 if (LHSRT->getDecl() == RHSRT->getDecl()) 3402 // "If both the operands have structure or union type, the result has 3403 // that type." This implies that CV qualifiers are dropped. 3404 return LHSTy.getUnqualifiedType(); 3405 // FIXME: Type of conditional expression must be complete in C mode. 3406 } 3407 3408 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3409 // The following || allows only one side to be void (a GCC-ism). 3410 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3411 if (!LHSTy->isVoidType()) 3412 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3413 << RHS->getSourceRange(); 3414 if (!RHSTy->isVoidType()) 3415 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3416 << LHS->getSourceRange(); 3417 ImpCastExprToType(LHS, Context.VoidTy); 3418 ImpCastExprToType(RHS, Context.VoidTy); 3419 return Context.VoidTy; 3420 } 3421 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3422 // the type of the other operand." 3423 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3424 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3425 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3426 return LHSTy; 3427 } 3428 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3429 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3430 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3431 return RHSTy; 3432 } 3433 // Handle things like Class and struct objc_class*. Here we case the result 3434 // to the pseudo-builtin, because that will be implicitly cast back to the 3435 // redefinition type if an attempt is made to access its fields. 3436 if (LHSTy->isObjCClassType() && 3437 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3438 ImpCastExprToType(RHS, LHSTy); 3439 return LHSTy; 3440 } 3441 if (RHSTy->isObjCClassType() && 3442 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3443 ImpCastExprToType(LHS, RHSTy); 3444 return RHSTy; 3445 } 3446 // And the same for struct objc_object* / id 3447 if (LHSTy->isObjCIdType() && 3448 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3449 ImpCastExprToType(RHS, LHSTy); 3450 return LHSTy; 3451 } 3452 if (RHSTy->isObjCIdType() && 3453 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3454 ImpCastExprToType(LHS, RHSTy); 3455 return RHSTy; 3456 } 3457 // Handle block pointer types. 3458 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3459 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3460 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3461 QualType destType = Context.getPointerType(Context.VoidTy); 3462 ImpCastExprToType(LHS, destType); 3463 ImpCastExprToType(RHS, destType); 3464 return destType; 3465 } 3466 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3467 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3468 return QualType(); 3469 } 3470 // We have 2 block pointer types. 3471 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3472 // Two identical block pointer types are always compatible. 3473 return LHSTy; 3474 } 3475 // The block pointer types aren't identical, continue checking. 3476 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3477 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3478 3479 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3480 rhptee.getUnqualifiedType())) { 3481 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3482 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3483 // In this situation, we assume void* type. No especially good 3484 // reason, but this is what gcc does, and we do have to pick 3485 // to get a consistent AST. 3486 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3487 ImpCastExprToType(LHS, incompatTy); 3488 ImpCastExprToType(RHS, incompatTy); 3489 return incompatTy; 3490 } 3491 // The block pointer types are compatible. 3492 ImpCastExprToType(LHS, LHSTy); 3493 ImpCastExprToType(RHS, LHSTy); 3494 return LHSTy; 3495 } 3496 // Check constraints for Objective-C object pointers types. 3497 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3498 3499 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3500 // Two identical object pointer types are always compatible. 3501 return LHSTy; 3502 } 3503 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>(); 3504 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>(); 3505 QualType compositeType = LHSTy; 3506 3507 // If both operands are interfaces and either operand can be 3508 // assigned to the other, use that type as the composite 3509 // type. This allows 3510 // xxx ? (A*) a : (B*) b 3511 // where B is a subclass of A. 3512 // 3513 // Additionally, as for assignment, if either type is 'id' 3514 // allow silent coercion. Finally, if the types are 3515 // incompatible then make sure to use 'id' as the composite 3516 // type so the result is acceptable for sending messages to. 3517 3518 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3519 // It could return the composite type. 3520 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3521 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3522 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3523 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3524 } else if ((LHSTy->isObjCQualifiedIdType() || 3525 RHSTy->isObjCQualifiedIdType()) && 3526 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3527 // Need to handle "id<xx>" explicitly. 3528 // GCC allows qualified id and any Objective-C type to devolve to 3529 // id. Currently localizing to here until clear this should be 3530 // part of ObjCQualifiedIdTypesAreCompatible. 3531 compositeType = Context.getObjCIdType(); 3532 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3533 compositeType = Context.getObjCIdType(); 3534 } else { 3535 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3536 << LHSTy << RHSTy 3537 << LHS->getSourceRange() << RHS->getSourceRange(); 3538 QualType incompatTy = Context.getObjCIdType(); 3539 ImpCastExprToType(LHS, incompatTy); 3540 ImpCastExprToType(RHS, incompatTy); 3541 return incompatTy; 3542 } 3543 // The object pointer types are compatible. 3544 ImpCastExprToType(LHS, compositeType); 3545 ImpCastExprToType(RHS, compositeType); 3546 return compositeType; 3547 } 3548 // Check Objective-C object pointer types and 'void *' 3549 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3550 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3551 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3552 QualType destPointee 3553 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3554 QualType destType = Context.getPointerType(destPointee); 3555 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3556 ImpCastExprToType(RHS, destType); // promote to void* 3557 return destType; 3558 } 3559 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3560 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3561 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3562 QualType destPointee 3563 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3564 QualType destType = Context.getPointerType(destPointee); 3565 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3566 ImpCastExprToType(LHS, destType); // promote to void* 3567 return destType; 3568 } 3569 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3570 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3571 // get the "pointed to" types 3572 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3573 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3574 3575 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3576 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3577 // Figure out necessary qualifiers (C99 6.5.15p6) 3578 QualType destPointee 3579 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3580 QualType destType = Context.getPointerType(destPointee); 3581 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3582 ImpCastExprToType(RHS, destType); // promote to void* 3583 return destType; 3584 } 3585 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3586 QualType destPointee 3587 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3588 QualType destType = Context.getPointerType(destPointee); 3589 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3590 ImpCastExprToType(RHS, destType); // promote to void* 3591 return destType; 3592 } 3593 3594 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3595 // Two identical pointer types are always compatible. 3596 return LHSTy; 3597 } 3598 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3599 rhptee.getUnqualifiedType())) { 3600 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3601 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3602 // In this situation, we assume void* type. No especially good 3603 // reason, but this is what gcc does, and we do have to pick 3604 // to get a consistent AST. 3605 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3606 ImpCastExprToType(LHS, incompatTy); 3607 ImpCastExprToType(RHS, incompatTy); 3608 return incompatTy; 3609 } 3610 // The pointer types are compatible. 3611 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3612 // differently qualified versions of compatible types, the result type is 3613 // a pointer to an appropriately qualified version of the *composite* 3614 // type. 3615 // FIXME: Need to calculate the composite type. 3616 // FIXME: Need to add qualifiers 3617 ImpCastExprToType(LHS, LHSTy); 3618 ImpCastExprToType(RHS, LHSTy); 3619 return LHSTy; 3620 } 3621 3622 // GCC compatibility: soften pointer/integer mismatch. 3623 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3624 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3625 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3626 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3627 return RHSTy; 3628 } 3629 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3630 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3631 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3632 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3633 return LHSTy; 3634 } 3635 3636 // Otherwise, the operands are not compatible. 3637 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3638 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3639 return QualType(); 3640} 3641 3642/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3643/// in the case of a the GNU conditional expr extension. 3644Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3645 SourceLocation ColonLoc, 3646 ExprArg Cond, ExprArg LHS, 3647 ExprArg RHS) { 3648 Expr *CondExpr = (Expr *) Cond.get(); 3649 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3650 3651 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3652 // was the condition. 3653 bool isLHSNull = LHSExpr == 0; 3654 if (isLHSNull) 3655 LHSExpr = CondExpr; 3656 3657 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3658 RHSExpr, QuestionLoc); 3659 if (result.isNull()) 3660 return ExprError(); 3661 3662 Cond.release(); 3663 LHS.release(); 3664 RHS.release(); 3665 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3666 isLHSNull ? 0 : LHSExpr, 3667 ColonLoc, RHSExpr, result)); 3668} 3669 3670// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3671// being closely modeled after the C99 spec:-). The odd characteristic of this 3672// routine is it effectively iqnores the qualifiers on the top level pointee. 3673// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3674// FIXME: add a couple examples in this comment. 3675Sema::AssignConvertType 3676Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3677 QualType lhptee, rhptee; 3678 3679 if ((lhsType->isObjCClassType() && 3680 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3681 (rhsType->isObjCClassType() && 3682 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3683 return Compatible; 3684 } 3685 3686 // get the "pointed to" type (ignoring qualifiers at the top level) 3687 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3688 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3689 3690 // make sure we operate on the canonical type 3691 lhptee = Context.getCanonicalType(lhptee); 3692 rhptee = Context.getCanonicalType(rhptee); 3693 3694 AssignConvertType ConvTy = Compatible; 3695 3696 // C99 6.5.16.1p1: This following citation is common to constraints 3697 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3698 // qualifiers of the type *pointed to* by the right; 3699 // FIXME: Handle ExtQualType 3700 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3701 ConvTy = CompatiblePointerDiscardsQualifiers; 3702 3703 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3704 // incomplete type and the other is a pointer to a qualified or unqualified 3705 // version of void... 3706 if (lhptee->isVoidType()) { 3707 if (rhptee->isIncompleteOrObjectType()) 3708 return ConvTy; 3709 3710 // As an extension, we allow cast to/from void* to function pointer. 3711 assert(rhptee->isFunctionType()); 3712 return FunctionVoidPointer; 3713 } 3714 3715 if (rhptee->isVoidType()) { 3716 if (lhptee->isIncompleteOrObjectType()) 3717 return ConvTy; 3718 3719 // As an extension, we allow cast to/from void* to function pointer. 3720 assert(lhptee->isFunctionType()); 3721 return FunctionVoidPointer; 3722 } 3723 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3724 // unqualified versions of compatible types, ... 3725 lhptee = lhptee.getUnqualifiedType(); 3726 rhptee = rhptee.getUnqualifiedType(); 3727 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3728 // Check if the pointee types are compatible ignoring the sign. 3729 // We explicitly check for char so that we catch "char" vs 3730 // "unsigned char" on systems where "char" is unsigned. 3731 if (lhptee->isCharType()) { 3732 lhptee = Context.UnsignedCharTy; 3733 } else if (lhptee->isSignedIntegerType()) { 3734 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3735 } 3736 if (rhptee->isCharType()) { 3737 rhptee = Context.UnsignedCharTy; 3738 } else if (rhptee->isSignedIntegerType()) { 3739 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3740 } 3741 if (lhptee == rhptee) { 3742 // Types are compatible ignoring the sign. Qualifier incompatibility 3743 // takes priority over sign incompatibility because the sign 3744 // warning can be disabled. 3745 if (ConvTy != Compatible) 3746 return ConvTy; 3747 return IncompatiblePointerSign; 3748 } 3749 // General pointer incompatibility takes priority over qualifiers. 3750 return IncompatiblePointer; 3751 } 3752 return ConvTy; 3753} 3754 3755/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3756/// block pointer types are compatible or whether a block and normal pointer 3757/// are compatible. It is more restrict than comparing two function pointer 3758// types. 3759Sema::AssignConvertType 3760Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3761 QualType rhsType) { 3762 QualType lhptee, rhptee; 3763 3764 // get the "pointed to" type (ignoring qualifiers at the top level) 3765 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3766 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3767 3768 // make sure we operate on the canonical type 3769 lhptee = Context.getCanonicalType(lhptee); 3770 rhptee = Context.getCanonicalType(rhptee); 3771 3772 AssignConvertType ConvTy = Compatible; 3773 3774 // For blocks we enforce that qualifiers are identical. 3775 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3776 ConvTy = CompatiblePointerDiscardsQualifiers; 3777 3778 if (!Context.typesAreCompatible(lhptee, rhptee)) 3779 return IncompatibleBlockPointer; 3780 return ConvTy; 3781} 3782 3783/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3784/// has code to accommodate several GCC extensions when type checking 3785/// pointers. Here are some objectionable examples that GCC considers warnings: 3786/// 3787/// int a, *pint; 3788/// short *pshort; 3789/// struct foo *pfoo; 3790/// 3791/// pint = pshort; // warning: assignment from incompatible pointer type 3792/// a = pint; // warning: assignment makes integer from pointer without a cast 3793/// pint = a; // warning: assignment makes pointer from integer without a cast 3794/// pint = pfoo; // warning: assignment from incompatible pointer type 3795/// 3796/// As a result, the code for dealing with pointers is more complex than the 3797/// C99 spec dictates. 3798/// 3799Sema::AssignConvertType 3800Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3801 // Get canonical types. We're not formatting these types, just comparing 3802 // them. 3803 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3804 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3805 3806 if (lhsType == rhsType) 3807 return Compatible; // Common case: fast path an exact match. 3808 3809 if ((lhsType->isObjCClassType() && 3810 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3811 (rhsType->isObjCClassType() && 3812 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3813 return Compatible; 3814 } 3815 3816 // If the left-hand side is a reference type, then we are in a 3817 // (rare!) case where we've allowed the use of references in C, 3818 // e.g., as a parameter type in a built-in function. In this case, 3819 // just make sure that the type referenced is compatible with the 3820 // right-hand side type. The caller is responsible for adjusting 3821 // lhsType so that the resulting expression does not have reference 3822 // type. 3823 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3824 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3825 return Compatible; 3826 return Incompatible; 3827 } 3828 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3829 // to the same ExtVector type. 3830 if (lhsType->isExtVectorType()) { 3831 if (rhsType->isExtVectorType()) 3832 return lhsType == rhsType ? Compatible : Incompatible; 3833 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3834 return Compatible; 3835 } 3836 3837 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3838 // If we are allowing lax vector conversions, and LHS and RHS are both 3839 // vectors, the total size only needs to be the same. This is a bitcast; 3840 // no bits are changed but the result type is different. 3841 if (getLangOptions().LaxVectorConversions && 3842 lhsType->isVectorType() && rhsType->isVectorType()) { 3843 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3844 return IncompatibleVectors; 3845 } 3846 return Incompatible; 3847 } 3848 3849 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3850 return Compatible; 3851 3852 if (isa<PointerType>(lhsType)) { 3853 if (rhsType->isIntegerType()) 3854 return IntToPointer; 3855 3856 if (isa<PointerType>(rhsType)) 3857 return CheckPointerTypesForAssignment(lhsType, rhsType); 3858 3859 // In general, C pointers are not compatible with ObjC object pointers. 3860 if (isa<ObjCObjectPointerType>(rhsType)) { 3861 if (lhsType->isVoidPointerType()) // an exception to the rule. 3862 return Compatible; 3863 return IncompatiblePointer; 3864 } 3865 if (rhsType->getAs<BlockPointerType>()) { 3866 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3867 return Compatible; 3868 3869 // Treat block pointers as objects. 3870 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3871 return Compatible; 3872 } 3873 return Incompatible; 3874 } 3875 3876 if (isa<BlockPointerType>(lhsType)) { 3877 if (rhsType->isIntegerType()) 3878 return IntToBlockPointer; 3879 3880 // Treat block pointers as objects. 3881 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3882 return Compatible; 3883 3884 if (rhsType->isBlockPointerType()) 3885 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3886 3887 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3888 if (RHSPT->getPointeeType()->isVoidType()) 3889 return Compatible; 3890 } 3891 return Incompatible; 3892 } 3893 3894 if (isa<ObjCObjectPointerType>(lhsType)) { 3895 if (rhsType->isIntegerType()) 3896 return IntToPointer; 3897 3898 // In general, C pointers are not compatible with ObjC object pointers. 3899 if (isa<PointerType>(rhsType)) { 3900 if (rhsType->isVoidPointerType()) // an exception to the rule. 3901 return Compatible; 3902 return IncompatiblePointer; 3903 } 3904 if (rhsType->isObjCObjectPointerType()) { 3905 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3906 return Compatible; 3907 if (Context.typesAreCompatible(lhsType, rhsType)) 3908 return Compatible; 3909 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3910 return IncompatibleObjCQualifiedId; 3911 return IncompatiblePointer; 3912 } 3913 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3914 if (RHSPT->getPointeeType()->isVoidType()) 3915 return Compatible; 3916 } 3917 // Treat block pointers as objects. 3918 if (rhsType->isBlockPointerType()) 3919 return Compatible; 3920 return Incompatible; 3921 } 3922 if (isa<PointerType>(rhsType)) { 3923 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3924 if (lhsType == Context.BoolTy) 3925 return Compatible; 3926 3927 if (lhsType->isIntegerType()) 3928 return PointerToInt; 3929 3930 if (isa<PointerType>(lhsType)) 3931 return CheckPointerTypesForAssignment(lhsType, rhsType); 3932 3933 if (isa<BlockPointerType>(lhsType) && 3934 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3935 return Compatible; 3936 return Incompatible; 3937 } 3938 if (isa<ObjCObjectPointerType>(rhsType)) { 3939 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3940 if (lhsType == Context.BoolTy) 3941 return Compatible; 3942 3943 if (lhsType->isIntegerType()) 3944 return PointerToInt; 3945 3946 // In general, C pointers are not compatible with ObjC object pointers. 3947 if (isa<PointerType>(lhsType)) { 3948 if (lhsType->isVoidPointerType()) // an exception to the rule. 3949 return Compatible; 3950 return IncompatiblePointer; 3951 } 3952 if (isa<BlockPointerType>(lhsType) && 3953 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3954 return Compatible; 3955 return Incompatible; 3956 } 3957 3958 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3959 if (Context.typesAreCompatible(lhsType, rhsType)) 3960 return Compatible; 3961 } 3962 return Incompatible; 3963} 3964 3965/// \brief Constructs a transparent union from an expression that is 3966/// used to initialize the transparent union. 3967static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3968 QualType UnionType, FieldDecl *Field) { 3969 // Build an initializer list that designates the appropriate member 3970 // of the transparent union. 3971 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3972 &E, 1, 3973 SourceLocation()); 3974 Initializer->setType(UnionType); 3975 Initializer->setInitializedFieldInUnion(Field); 3976 3977 // Build a compound literal constructing a value of the transparent 3978 // union type from this initializer list. 3979 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3980 false); 3981} 3982 3983Sema::AssignConvertType 3984Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3985 QualType FromType = rExpr->getType(); 3986 3987 // If the ArgType is a Union type, we want to handle a potential 3988 // transparent_union GCC extension. 3989 const RecordType *UT = ArgType->getAsUnionType(); 3990 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3991 return Incompatible; 3992 3993 // The field to initialize within the transparent union. 3994 RecordDecl *UD = UT->getDecl(); 3995 FieldDecl *InitField = 0; 3996 // It's compatible if the expression matches any of the fields. 3997 for (RecordDecl::field_iterator it = UD->field_begin(), 3998 itend = UD->field_end(); 3999 it != itend; ++it) { 4000 if (it->getType()->isPointerType()) { 4001 // If the transparent union contains a pointer type, we allow: 4002 // 1) void pointer 4003 // 2) null pointer constant 4004 if (FromType->isPointerType()) 4005 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 4006 ImpCastExprToType(rExpr, it->getType()); 4007 InitField = *it; 4008 break; 4009 } 4010 4011 if (rExpr->isNullPointerConstant(Context, 4012 Expr::NPC_ValueDependentIsNull)) { 4013 ImpCastExprToType(rExpr, it->getType()); 4014 InitField = *it; 4015 break; 4016 } 4017 } 4018 4019 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 4020 == Compatible) { 4021 InitField = *it; 4022 break; 4023 } 4024 } 4025 4026 if (!InitField) 4027 return Incompatible; 4028 4029 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 4030 return Compatible; 4031} 4032 4033Sema::AssignConvertType 4034Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 4035 if (getLangOptions().CPlusPlus) { 4036 if (!lhsType->isRecordType()) { 4037 // C++ 5.17p3: If the left operand is not of class type, the 4038 // expression is implicitly converted (C++ 4) to the 4039 // cv-unqualified type of the left operand. 4040 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 4041 "assigning")) 4042 return Incompatible; 4043 return Compatible; 4044 } 4045 4046 // FIXME: Currently, we fall through and treat C++ classes like C 4047 // structures. 4048 } 4049 4050 // C99 6.5.16.1p1: the left operand is a pointer and the right is 4051 // a null pointer constant. 4052 if ((lhsType->isPointerType() || 4053 lhsType->isObjCObjectPointerType() || 4054 lhsType->isBlockPointerType()) 4055 && rExpr->isNullPointerConstant(Context, 4056 Expr::NPC_ValueDependentIsNull)) { 4057 ImpCastExprToType(rExpr, lhsType); 4058 return Compatible; 4059 } 4060 4061 // This check seems unnatural, however it is necessary to ensure the proper 4062 // conversion of functions/arrays. If the conversion were done for all 4063 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 4064 // expressions that surpress this implicit conversion (&, sizeof). 4065 // 4066 // Suppress this for references: C++ 8.5.3p5. 4067 if (!lhsType->isReferenceType()) 4068 DefaultFunctionArrayConversion(rExpr); 4069 4070 Sema::AssignConvertType result = 4071 CheckAssignmentConstraints(lhsType, rExpr->getType()); 4072 4073 // C99 6.5.16.1p2: The value of the right operand is converted to the 4074 // type of the assignment expression. 4075 // CheckAssignmentConstraints allows the left-hand side to be a reference, 4076 // so that we can use references in built-in functions even in C. 4077 // The getNonReferenceType() call makes sure that the resulting expression 4078 // does not have reference type. 4079 if (result != Incompatible && rExpr->getType() != lhsType) 4080 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 4081 return result; 4082} 4083 4084QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 4085 Diag(Loc, diag::err_typecheck_invalid_operands) 4086 << lex->getType() << rex->getType() 4087 << lex->getSourceRange() << rex->getSourceRange(); 4088 return QualType(); 4089} 4090 4091inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 4092 Expr *&rex) { 4093 // For conversion purposes, we ignore any qualifiers. 4094 // For example, "const float" and "float" are equivalent. 4095 QualType lhsType = 4096 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 4097 QualType rhsType = 4098 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 4099 4100 // If the vector types are identical, return. 4101 if (lhsType == rhsType) 4102 return lhsType; 4103 4104 // Handle the case of a vector & extvector type of the same size and element 4105 // type. It would be nice if we only had one vector type someday. 4106 if (getLangOptions().LaxVectorConversions) { 4107 // FIXME: Should we warn here? 4108 if (const VectorType *LV = lhsType->getAs<VectorType>()) { 4109 if (const VectorType *RV = rhsType->getAs<VectorType>()) 4110 if (LV->getElementType() == RV->getElementType() && 4111 LV->getNumElements() == RV->getNumElements()) { 4112 return lhsType->isExtVectorType() ? lhsType : rhsType; 4113 } 4114 } 4115 } 4116 4117 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 4118 // swap back (so that we don't reverse the inputs to a subtract, for instance. 4119 bool swapped = false; 4120 if (rhsType->isExtVectorType()) { 4121 swapped = true; 4122 std::swap(rex, lex); 4123 std::swap(rhsType, lhsType); 4124 } 4125 4126 // Handle the case of an ext vector and scalar. 4127 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) { 4128 QualType EltTy = LV->getElementType(); 4129 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 4130 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 4131 ImpCastExprToType(rex, lhsType); 4132 if (swapped) std::swap(rex, lex); 4133 return lhsType; 4134 } 4135 } 4136 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 4137 rhsType->isRealFloatingType()) { 4138 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 4139 ImpCastExprToType(rex, lhsType); 4140 if (swapped) std::swap(rex, lex); 4141 return lhsType; 4142 } 4143 } 4144 } 4145 4146 // Vectors of different size or scalar and non-ext-vector are errors. 4147 Diag(Loc, diag::err_typecheck_vector_not_convertable) 4148 << lex->getType() << rex->getType() 4149 << lex->getSourceRange() << rex->getSourceRange(); 4150 return QualType(); 4151} 4152 4153inline QualType Sema::CheckMultiplyDivideOperands( 4154 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4155 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4156 return CheckVectorOperands(Loc, lex, rex); 4157 4158 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4159 4160 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4161 return compType; 4162 return InvalidOperands(Loc, lex, rex); 4163} 4164 4165inline QualType Sema::CheckRemainderOperands( 4166 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4167 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4168 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4169 return CheckVectorOperands(Loc, lex, rex); 4170 return InvalidOperands(Loc, lex, rex); 4171 } 4172 4173 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4174 4175 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4176 return compType; 4177 return InvalidOperands(Loc, lex, rex); 4178} 4179 4180inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4181 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) { 4182 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4183 QualType compType = CheckVectorOperands(Loc, lex, rex); 4184 if (CompLHSTy) *CompLHSTy = compType; 4185 return compType; 4186 } 4187 4188 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4189 4190 // handle the common case first (both operands are arithmetic). 4191 if (lex->getType()->isArithmeticType() && 4192 rex->getType()->isArithmeticType()) { 4193 if (CompLHSTy) *CompLHSTy = compType; 4194 return compType; 4195 } 4196 4197 // Put any potential pointer into PExp 4198 Expr* PExp = lex, *IExp = rex; 4199 if (IExp->getType()->isAnyPointerType()) 4200 std::swap(PExp, IExp); 4201 4202 if (PExp->getType()->isAnyPointerType()) { 4203 4204 if (IExp->getType()->isIntegerType()) { 4205 QualType PointeeTy = PExp->getType()->getPointeeType(); 4206 4207 // Check for arithmetic on pointers to incomplete types. 4208 if (PointeeTy->isVoidType()) { 4209 if (getLangOptions().CPlusPlus) { 4210 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4211 << lex->getSourceRange() << rex->getSourceRange(); 4212 return QualType(); 4213 } 4214 4215 // GNU extension: arithmetic on pointer to void 4216 Diag(Loc, diag::ext_gnu_void_ptr) 4217 << lex->getSourceRange() << rex->getSourceRange(); 4218 } else if (PointeeTy->isFunctionType()) { 4219 if (getLangOptions().CPlusPlus) { 4220 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4221 << lex->getType() << lex->getSourceRange(); 4222 return QualType(); 4223 } 4224 4225 // GNU extension: arithmetic on pointer to function 4226 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4227 << lex->getType() << lex->getSourceRange(); 4228 } else { 4229 // Check if we require a complete type. 4230 if (((PExp->getType()->isPointerType() && 4231 !PExp->getType()->isDependentType()) || 4232 PExp->getType()->isObjCObjectPointerType()) && 4233 RequireCompleteType(Loc, PointeeTy, 4234 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4235 << PExp->getSourceRange() 4236 << PExp->getType())) 4237 return QualType(); 4238 } 4239 // Diagnose bad cases where we step over interface counts. 4240 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4241 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4242 << PointeeTy << PExp->getSourceRange(); 4243 return QualType(); 4244 } 4245 4246 if (CompLHSTy) { 4247 QualType LHSTy = Context.isPromotableBitField(lex); 4248 if (LHSTy.isNull()) { 4249 LHSTy = lex->getType(); 4250 if (LHSTy->isPromotableIntegerType()) 4251 LHSTy = Context.getPromotedIntegerType(LHSTy); 4252 } 4253 *CompLHSTy = LHSTy; 4254 } 4255 return PExp->getType(); 4256 } 4257 } 4258 4259 return InvalidOperands(Loc, lex, rex); 4260} 4261 4262// C99 6.5.6 4263QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4264 SourceLocation Loc, QualType* CompLHSTy) { 4265 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4266 QualType compType = CheckVectorOperands(Loc, lex, rex); 4267 if (CompLHSTy) *CompLHSTy = compType; 4268 return compType; 4269 } 4270 4271 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4272 4273 // Enforce type constraints: C99 6.5.6p3. 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 // Either ptr - int or ptr - ptr. 4283 if (lex->getType()->isAnyPointerType()) { 4284 QualType lpointee = lex->getType()->getPointeeType(); 4285 4286 // The LHS must be an completely-defined object type. 4287 4288 bool ComplainAboutVoid = false; 4289 Expr *ComplainAboutFunc = 0; 4290 if (lpointee->isVoidType()) { 4291 if (getLangOptions().CPlusPlus) { 4292 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4293 << lex->getSourceRange() << rex->getSourceRange(); 4294 return QualType(); 4295 } 4296 4297 // GNU C extension: arithmetic on pointer to void 4298 ComplainAboutVoid = true; 4299 } else if (lpointee->isFunctionType()) { 4300 if (getLangOptions().CPlusPlus) { 4301 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4302 << lex->getType() << lex->getSourceRange(); 4303 return QualType(); 4304 } 4305 4306 // GNU C extension: arithmetic on pointer to function 4307 ComplainAboutFunc = lex; 4308 } else if (!lpointee->isDependentType() && 4309 RequireCompleteType(Loc, lpointee, 4310 PDiag(diag::err_typecheck_sub_ptr_object) 4311 << lex->getSourceRange() 4312 << lex->getType())) 4313 return QualType(); 4314 4315 // Diagnose bad cases where we step over interface counts. 4316 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4317 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4318 << lpointee << lex->getSourceRange(); 4319 return QualType(); 4320 } 4321 4322 // The result type of a pointer-int computation is the pointer type. 4323 if (rex->getType()->isIntegerType()) { 4324 if (ComplainAboutVoid) 4325 Diag(Loc, diag::ext_gnu_void_ptr) 4326 << lex->getSourceRange() << rex->getSourceRange(); 4327 if (ComplainAboutFunc) 4328 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4329 << ComplainAboutFunc->getType() 4330 << ComplainAboutFunc->getSourceRange(); 4331 4332 if (CompLHSTy) *CompLHSTy = lex->getType(); 4333 return lex->getType(); 4334 } 4335 4336 // Handle pointer-pointer subtractions. 4337 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4338 QualType rpointee = RHSPTy->getPointeeType(); 4339 4340 // RHS must be a completely-type object type. 4341 // Handle the GNU void* extension. 4342 if (rpointee->isVoidType()) { 4343 if (getLangOptions().CPlusPlus) { 4344 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4345 << lex->getSourceRange() << rex->getSourceRange(); 4346 return QualType(); 4347 } 4348 4349 ComplainAboutVoid = true; 4350 } else if (rpointee->isFunctionType()) { 4351 if (getLangOptions().CPlusPlus) { 4352 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4353 << rex->getType() << rex->getSourceRange(); 4354 return QualType(); 4355 } 4356 4357 // GNU extension: arithmetic on pointer to function 4358 if (!ComplainAboutFunc) 4359 ComplainAboutFunc = rex; 4360 } else if (!rpointee->isDependentType() && 4361 RequireCompleteType(Loc, rpointee, 4362 PDiag(diag::err_typecheck_sub_ptr_object) 4363 << rex->getSourceRange() 4364 << rex->getType())) 4365 return QualType(); 4366 4367 if (getLangOptions().CPlusPlus) { 4368 // Pointee types must be the same: C++ [expr.add] 4369 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4370 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4371 << lex->getType() << rex->getType() 4372 << lex->getSourceRange() << rex->getSourceRange(); 4373 return QualType(); 4374 } 4375 } else { 4376 // Pointee types must be compatible C99 6.5.6p3 4377 if (!Context.typesAreCompatible( 4378 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4379 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4380 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4381 << lex->getType() << rex->getType() 4382 << lex->getSourceRange() << rex->getSourceRange(); 4383 return QualType(); 4384 } 4385 } 4386 4387 if (ComplainAboutVoid) 4388 Diag(Loc, diag::ext_gnu_void_ptr) 4389 << lex->getSourceRange() << rex->getSourceRange(); 4390 if (ComplainAboutFunc) 4391 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4392 << ComplainAboutFunc->getType() 4393 << ComplainAboutFunc->getSourceRange(); 4394 4395 if (CompLHSTy) *CompLHSTy = lex->getType(); 4396 return Context.getPointerDiffType(); 4397 } 4398 } 4399 4400 return InvalidOperands(Loc, lex, rex); 4401} 4402 4403// C99 6.5.7 4404QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4405 bool isCompAssign) { 4406 // C99 6.5.7p2: Each of the operands shall have integer type. 4407 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4408 return InvalidOperands(Loc, lex, rex); 4409 4410 // Shifts don't perform usual arithmetic conversions, they just do integer 4411 // promotions on each operand. C99 6.5.7p3 4412 QualType LHSTy = Context.isPromotableBitField(lex); 4413 if (LHSTy.isNull()) { 4414 LHSTy = lex->getType(); 4415 if (LHSTy->isPromotableIntegerType()) 4416 LHSTy = Context.getPromotedIntegerType(LHSTy); 4417 } 4418 if (!isCompAssign) 4419 ImpCastExprToType(lex, LHSTy); 4420 4421 UsualUnaryConversions(rex); 4422 4423 // Sanity-check shift operands 4424 llvm::APSInt Right; 4425 // Check right/shifter operand 4426 if (!rex->isValueDependent() && 4427 rex->isIntegerConstantExpr(Right, Context)) { 4428 if (Right.isNegative()) 4429 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4430 else { 4431 llvm::APInt LeftBits(Right.getBitWidth(), 4432 Context.getTypeSize(lex->getType())); 4433 if (Right.uge(LeftBits)) 4434 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4435 } 4436 } 4437 4438 // "The type of the result is that of the promoted left operand." 4439 return LHSTy; 4440} 4441 4442// C99 6.5.8, C++ [expr.rel] 4443QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4444 unsigned OpaqueOpc, bool isRelational) { 4445 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4446 4447 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4448 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4449 4450 // C99 6.5.8p3 / C99 6.5.9p4 4451 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4452 UsualArithmeticConversions(lex, rex); 4453 else { 4454 UsualUnaryConversions(lex); 4455 UsualUnaryConversions(rex); 4456 } 4457 QualType lType = lex->getType(); 4458 QualType rType = rex->getType(); 4459 4460 if (!lType->isFloatingType() 4461 && !(lType->isBlockPointerType() && isRelational)) { 4462 // For non-floating point types, check for self-comparisons of the form 4463 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4464 // often indicate logic errors in the program. 4465 // NOTE: Don't warn about comparisons of enum constants. These can arise 4466 // from macro expansions, and are usually quite deliberate. 4467 Expr *LHSStripped = lex->IgnoreParens(); 4468 Expr *RHSStripped = rex->IgnoreParens(); 4469 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4470 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4471 if (DRL->getDecl() == DRR->getDecl() && 4472 !isa<EnumConstantDecl>(DRL->getDecl())) 4473 Diag(Loc, diag::warn_selfcomparison); 4474 4475 if (isa<CastExpr>(LHSStripped)) 4476 LHSStripped = LHSStripped->IgnoreParenCasts(); 4477 if (isa<CastExpr>(RHSStripped)) 4478 RHSStripped = RHSStripped->IgnoreParenCasts(); 4479 4480 // Warn about comparisons against a string constant (unless the other 4481 // operand is null), the user probably wants strcmp. 4482 Expr *literalString = 0; 4483 Expr *literalStringStripped = 0; 4484 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4485 !RHSStripped->isNullPointerConstant(Context, 4486 Expr::NPC_ValueDependentIsNull)) { 4487 literalString = lex; 4488 literalStringStripped = LHSStripped; 4489 } else if ((isa<StringLiteral>(RHSStripped) || 4490 isa<ObjCEncodeExpr>(RHSStripped)) && 4491 !LHSStripped->isNullPointerConstant(Context, 4492 Expr::NPC_ValueDependentIsNull)) { 4493 literalString = rex; 4494 literalStringStripped = RHSStripped; 4495 } 4496 4497 if (literalString) { 4498 std::string resultComparison; 4499 switch (Opc) { 4500 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4501 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4502 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4503 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4504 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4505 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4506 default: assert(false && "Invalid comparison operator"); 4507 } 4508 Diag(Loc, diag::warn_stringcompare) 4509 << isa<ObjCEncodeExpr>(literalStringStripped) 4510 << literalString->getSourceRange() 4511 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4512 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4513 "strcmp(") 4514 << CodeModificationHint::CreateInsertion( 4515 PP.getLocForEndOfToken(rex->getLocEnd()), 4516 resultComparison); 4517 } 4518 } 4519 4520 // The result of comparisons is 'bool' in C++, 'int' in C. 4521 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4522 4523 if (isRelational) { 4524 if (lType->isRealType() && rType->isRealType()) 4525 return ResultTy; 4526 } else { 4527 // Check for comparisons of floating point operands using != and ==. 4528 if (lType->isFloatingType()) { 4529 assert(rType->isFloatingType()); 4530 CheckFloatComparison(Loc,lex,rex); 4531 } 4532 4533 if (lType->isArithmeticType() && rType->isArithmeticType()) 4534 return ResultTy; 4535 } 4536 4537 bool LHSIsNull = lex->isNullPointerConstant(Context, 4538 Expr::NPC_ValueDependentIsNull); 4539 bool RHSIsNull = rex->isNullPointerConstant(Context, 4540 Expr::NPC_ValueDependentIsNull); 4541 4542 // All of the following pointer related warnings are GCC extensions, except 4543 // when handling null pointer constants. One day, we can consider making them 4544 // errors (when -pedantic-errors is enabled). 4545 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4546 QualType LCanPointeeTy = 4547 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4548 QualType RCanPointeeTy = 4549 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4550 4551 if (getLangOptions().CPlusPlus) { 4552 if (LCanPointeeTy == RCanPointeeTy) 4553 return ResultTy; 4554 4555 // C++ [expr.rel]p2: 4556 // [...] Pointer conversions (4.10) and qualification 4557 // conversions (4.4) are performed on pointer operands (or on 4558 // a pointer operand and a null pointer constant) to bring 4559 // them to their composite pointer type. [...] 4560 // 4561 // C++ [expr.eq]p1 uses the same notion for (in)equality 4562 // comparisons of pointers. 4563 QualType T = FindCompositePointerType(lex, rex); 4564 if (T.isNull()) { 4565 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4566 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4567 return QualType(); 4568 } 4569 4570 ImpCastExprToType(lex, T); 4571 ImpCastExprToType(rex, T); 4572 return ResultTy; 4573 } 4574 // C99 6.5.9p2 and C99 6.5.8p2 4575 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4576 RCanPointeeTy.getUnqualifiedType())) { 4577 // Valid unless a relational comparison of function pointers 4578 if (isRelational && LCanPointeeTy->isFunctionType()) { 4579 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4580 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4581 } 4582 } else if (!isRelational && 4583 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4584 // Valid unless comparison between non-null pointer and function pointer 4585 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4586 && !LHSIsNull && !RHSIsNull) { 4587 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4588 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4589 } 4590 } else { 4591 // Invalid 4592 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4593 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4594 } 4595 if (LCanPointeeTy != RCanPointeeTy) 4596 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4597 return ResultTy; 4598 } 4599 4600 if (getLangOptions().CPlusPlus) { 4601 // Comparison of pointers with null pointer constants and equality 4602 // comparisons of member pointers to null pointer constants. 4603 if (RHSIsNull && 4604 (lType->isPointerType() || 4605 (!isRelational && lType->isMemberPointerType()))) { 4606 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4607 return ResultTy; 4608 } 4609 if (LHSIsNull && 4610 (rType->isPointerType() || 4611 (!isRelational && rType->isMemberPointerType()))) { 4612 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4613 return ResultTy; 4614 } 4615 4616 // Comparison of member pointers. 4617 if (!isRelational && 4618 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4619 // C++ [expr.eq]p2: 4620 // In addition, pointers to members can be compared, or a pointer to 4621 // member and a null pointer constant. Pointer to member conversions 4622 // (4.11) and qualification conversions (4.4) are performed to bring 4623 // them to a common type. If one operand is a null pointer constant, 4624 // the common type is the type of the other operand. Otherwise, the 4625 // common type is a pointer to member type similar (4.4) to the type 4626 // of one of the operands, with a cv-qualification signature (4.4) 4627 // that is the union of the cv-qualification signatures of the operand 4628 // types. 4629 QualType T = FindCompositePointerType(lex, rex); 4630 if (T.isNull()) { 4631 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4632 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4633 return QualType(); 4634 } 4635 4636 ImpCastExprToType(lex, T); 4637 ImpCastExprToType(rex, T); 4638 return ResultTy; 4639 } 4640 4641 // Comparison of nullptr_t with itself. 4642 if (lType->isNullPtrType() && rType->isNullPtrType()) 4643 return ResultTy; 4644 } 4645 4646 // Handle block pointer types. 4647 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4648 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4649 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4650 4651 if (!LHSIsNull && !RHSIsNull && 4652 !Context.typesAreCompatible(lpointee, rpointee)) { 4653 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4654 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4655 } 4656 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4657 return ResultTy; 4658 } 4659 // Allow block pointers to be compared with null pointer constants. 4660 if (!isRelational 4661 && ((lType->isBlockPointerType() && rType->isPointerType()) 4662 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4663 if (!LHSIsNull && !RHSIsNull) { 4664 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4665 ->getPointeeType()->isVoidType()) 4666 || (lType->isPointerType() && lType->getAs<PointerType>() 4667 ->getPointeeType()->isVoidType()))) 4668 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4669 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4670 } 4671 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4672 return ResultTy; 4673 } 4674 4675 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4676 if (lType->isPointerType() || rType->isPointerType()) { 4677 const PointerType *LPT = lType->getAs<PointerType>(); 4678 const PointerType *RPT = rType->getAs<PointerType>(); 4679 bool LPtrToVoid = LPT ? 4680 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4681 bool RPtrToVoid = RPT ? 4682 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4683 4684 if (!LPtrToVoid && !RPtrToVoid && 4685 !Context.typesAreCompatible(lType, rType)) { 4686 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4687 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4688 } 4689 ImpCastExprToType(rex, lType); 4690 return ResultTy; 4691 } 4692 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4693 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4694 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4695 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4696 ImpCastExprToType(rex, lType); 4697 return ResultTy; 4698 } 4699 } 4700 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4701 unsigned DiagID = 0; 4702 if (RHSIsNull) { 4703 if (isRelational) 4704 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4705 } else if (isRelational) 4706 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4707 else 4708 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4709 4710 if (DiagID) { 4711 Diag(Loc, DiagID) 4712 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4713 } 4714 ImpCastExprToType(rex, lType); // promote the integer to pointer 4715 return ResultTy; 4716 } 4717 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4718 unsigned DiagID = 0; 4719 if (LHSIsNull) { 4720 if (isRelational) 4721 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4722 } else if (isRelational) 4723 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4724 else 4725 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4726 4727 if (DiagID) { 4728 Diag(Loc, DiagID) 4729 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4730 } 4731 ImpCastExprToType(lex, rType); // promote the integer to pointer 4732 return ResultTy; 4733 } 4734 // Handle block pointers. 4735 if (!isRelational && RHSIsNull 4736 && lType->isBlockPointerType() && rType->isIntegerType()) { 4737 ImpCastExprToType(rex, lType); // promote the integer to pointer 4738 return ResultTy; 4739 } 4740 if (!isRelational && LHSIsNull 4741 && lType->isIntegerType() && rType->isBlockPointerType()) { 4742 ImpCastExprToType(lex, rType); // promote the integer to pointer 4743 return ResultTy; 4744 } 4745 return InvalidOperands(Loc, lex, rex); 4746} 4747 4748/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4749/// operates on extended vector types. Instead of producing an IntTy result, 4750/// like a scalar comparison, a vector comparison produces a vector of integer 4751/// types. 4752QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4753 SourceLocation Loc, 4754 bool isRelational) { 4755 // Check to make sure we're operating on vectors of the same type and width, 4756 // Allowing one side to be a scalar of element type. 4757 QualType vType = CheckVectorOperands(Loc, lex, rex); 4758 if (vType.isNull()) 4759 return vType; 4760 4761 QualType lType = lex->getType(); 4762 QualType rType = rex->getType(); 4763 4764 // For non-floating point types, check for self-comparisons of the form 4765 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4766 // often indicate logic errors in the program. 4767 if (!lType->isFloatingType()) { 4768 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4769 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4770 if (DRL->getDecl() == DRR->getDecl()) 4771 Diag(Loc, diag::warn_selfcomparison); 4772 } 4773 4774 // Check for comparisons of floating point operands using != and ==. 4775 if (!isRelational && lType->isFloatingType()) { 4776 assert (rType->isFloatingType()); 4777 CheckFloatComparison(Loc,lex,rex); 4778 } 4779 4780 // Return the type for the comparison, which is the same as vector type for 4781 // integer vectors, or an integer type of identical size and number of 4782 // elements for floating point vectors. 4783 if (lType->isIntegerType()) 4784 return lType; 4785 4786 const VectorType *VTy = lType->getAs<VectorType>(); 4787 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4788 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4789 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4790 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4791 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4792 4793 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4794 "Unhandled vector element size in vector compare"); 4795 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4796} 4797 4798inline QualType Sema::CheckBitwiseOperands( 4799 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4800 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4801 return CheckVectorOperands(Loc, lex, rex); 4802 4803 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4804 4805 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4806 return compType; 4807 return InvalidOperands(Loc, lex, rex); 4808} 4809 4810inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4811 Expr *&lex, Expr *&rex, SourceLocation Loc) { 4812 UsualUnaryConversions(lex); 4813 UsualUnaryConversions(rex); 4814 4815 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4816 return Context.IntTy; 4817 return InvalidOperands(Loc, lex, rex); 4818} 4819 4820/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4821/// is a read-only property; return true if so. A readonly property expression 4822/// depends on various declarations and thus must be treated specially. 4823/// 4824static bool IsReadonlyProperty(Expr *E, Sema &S) { 4825 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4826 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4827 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4828 QualType BaseType = PropExpr->getBase()->getType(); 4829 if (const ObjCObjectPointerType *OPT = 4830 BaseType->getAsObjCInterfacePointerType()) 4831 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4832 if (S.isPropertyReadonly(PDecl, IFace)) 4833 return true; 4834 } 4835 } 4836 return false; 4837} 4838 4839/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4840/// emit an error and return true. If so, return false. 4841static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4842 SourceLocation OrigLoc = Loc; 4843 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4844 &Loc); 4845 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4846 IsLV = Expr::MLV_ReadonlyProperty; 4847 if (IsLV == Expr::MLV_Valid) 4848 return false; 4849 4850 unsigned Diag = 0; 4851 bool NeedType = false; 4852 switch (IsLV) { // C99 6.5.16p2 4853 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4854 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4855 case Expr::MLV_ArrayType: 4856 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4857 NeedType = true; 4858 break; 4859 case Expr::MLV_NotObjectType: 4860 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4861 NeedType = true; 4862 break; 4863 case Expr::MLV_LValueCast: 4864 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4865 break; 4866 case Expr::MLV_InvalidExpression: 4867 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4868 break; 4869 case Expr::MLV_IncompleteType: 4870 case Expr::MLV_IncompleteVoidType: 4871 return S.RequireCompleteType(Loc, E->getType(), 4872 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4873 << E->getSourceRange()); 4874 case Expr::MLV_DuplicateVectorComponents: 4875 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4876 break; 4877 case Expr::MLV_NotBlockQualified: 4878 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4879 break; 4880 case Expr::MLV_ReadonlyProperty: 4881 Diag = diag::error_readonly_property_assignment; 4882 break; 4883 case Expr::MLV_NoSetterProperty: 4884 Diag = diag::error_nosetter_property_assignment; 4885 break; 4886 } 4887 4888 SourceRange Assign; 4889 if (Loc != OrigLoc) 4890 Assign = SourceRange(OrigLoc, OrigLoc); 4891 if (NeedType) 4892 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4893 else 4894 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4895 return true; 4896} 4897 4898 4899 4900// C99 6.5.16.1 4901QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4902 SourceLocation Loc, 4903 QualType CompoundType) { 4904 // Verify that LHS is a modifiable lvalue, and emit error if not. 4905 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4906 return QualType(); 4907 4908 QualType LHSType = LHS->getType(); 4909 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4910 4911 AssignConvertType ConvTy; 4912 if (CompoundType.isNull()) { 4913 // Simple assignment "x = y". 4914 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4915 // Special case of NSObject attributes on c-style pointer types. 4916 if (ConvTy == IncompatiblePointer && 4917 ((Context.isObjCNSObjectType(LHSType) && 4918 RHSType->isObjCObjectPointerType()) || 4919 (Context.isObjCNSObjectType(RHSType) && 4920 LHSType->isObjCObjectPointerType()))) 4921 ConvTy = Compatible; 4922 4923 // If the RHS is a unary plus or minus, check to see if they = and + are 4924 // right next to each other. If so, the user may have typo'd "x =+ 4" 4925 // instead of "x += 4". 4926 Expr *RHSCheck = RHS; 4927 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4928 RHSCheck = ICE->getSubExpr(); 4929 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4930 if ((UO->getOpcode() == UnaryOperator::Plus || 4931 UO->getOpcode() == UnaryOperator::Minus) && 4932 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4933 // Only if the two operators are exactly adjacent. 4934 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4935 // And there is a space or other character before the subexpr of the 4936 // unary +/-. We don't want to warn on "x=-1". 4937 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4938 UO->getSubExpr()->getLocStart().isFileID()) { 4939 Diag(Loc, diag::warn_not_compound_assign) 4940 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4941 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4942 } 4943 } 4944 } else { 4945 // Compound assignment "x += y" 4946 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4947 } 4948 4949 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4950 RHS, "assigning")) 4951 return QualType(); 4952 4953 // C99 6.5.16p3: The type of an assignment expression is the type of the 4954 // left operand unless the left operand has qualified type, in which case 4955 // it is the unqualified version of the type of the left operand. 4956 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4957 // is converted to the type of the assignment expression (above). 4958 // C++ 5.17p1: the type of the assignment expression is that of its left 4959 // operand. 4960 return LHSType.getUnqualifiedType(); 4961} 4962 4963// C99 6.5.17 4964QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4965 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4966 DefaultFunctionArrayConversion(RHS); 4967 4968 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4969 // incomplete in C++). 4970 4971 return RHS->getType(); 4972} 4973 4974/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4975/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4976QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4977 bool isInc) { 4978 if (Op->isTypeDependent()) 4979 return Context.DependentTy; 4980 4981 QualType ResType = Op->getType(); 4982 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4983 4984 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4985 // Decrement of bool is not allowed. 4986 if (!isInc) { 4987 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4988 return QualType(); 4989 } 4990 // Increment of bool sets it to true, but is deprecated. 4991 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4992 } else if (ResType->isRealType()) { 4993 // OK! 4994 } else if (ResType->isAnyPointerType()) { 4995 QualType PointeeTy = ResType->getPointeeType(); 4996 4997 // C99 6.5.2.4p2, 6.5.6p2 4998 if (PointeeTy->isVoidType()) { 4999 if (getLangOptions().CPlusPlus) { 5000 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 5001 << Op->getSourceRange(); 5002 return QualType(); 5003 } 5004 5005 // Pointer to void is a GNU extension in C. 5006 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 5007 } else if (PointeeTy->isFunctionType()) { 5008 if (getLangOptions().CPlusPlus) { 5009 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 5010 << Op->getType() << Op->getSourceRange(); 5011 return QualType(); 5012 } 5013 5014 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 5015 << ResType << Op->getSourceRange(); 5016 } else if (RequireCompleteType(OpLoc, PointeeTy, 5017 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 5018 << Op->getSourceRange() 5019 << ResType)) 5020 return QualType(); 5021 // Diagnose bad cases where we step over interface counts. 5022 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 5023 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 5024 << PointeeTy << Op->getSourceRange(); 5025 return QualType(); 5026 } 5027 } else if (ResType->isComplexType()) { 5028 // C99 does not support ++/-- on complex types, we allow as an extension. 5029 Diag(OpLoc, diag::ext_integer_increment_complex) 5030 << ResType << Op->getSourceRange(); 5031 } else { 5032 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 5033 << ResType << Op->getSourceRange(); 5034 return QualType(); 5035 } 5036 // At this point, we know we have a real, complex or pointer type. 5037 // Now make sure the operand is a modifiable lvalue. 5038 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 5039 return QualType(); 5040 return ResType; 5041} 5042 5043/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 5044/// This routine allows us to typecheck complex/recursive expressions 5045/// where the declaration is needed for type checking. We only need to 5046/// handle cases when the expression references a function designator 5047/// or is an lvalue. Here are some examples: 5048/// - &(x) => x 5049/// - &*****f => f for f a function designator. 5050/// - &s.xx => s 5051/// - &s.zz[1].yy -> s, if zz is an array 5052/// - *(x + 1) -> x, if x is an array 5053/// - &"123"[2] -> 0 5054/// - & __real__ x -> x 5055static NamedDecl *getPrimaryDecl(Expr *E) { 5056 switch (E->getStmtClass()) { 5057 case Stmt::DeclRefExprClass: 5058 case Stmt::QualifiedDeclRefExprClass: 5059 return cast<DeclRefExpr>(E)->getDecl(); 5060 case Stmt::MemberExprClass: 5061 // If this is an arrow operator, the address is an offset from 5062 // the base's value, so the object the base refers to is 5063 // irrelevant. 5064 if (cast<MemberExpr>(E)->isArrow()) 5065 return 0; 5066 // Otherwise, the expression refers to a part of the base 5067 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 5068 case Stmt::ArraySubscriptExprClass: { 5069 // FIXME: This code shouldn't be necessary! We should catch the implicit 5070 // promotion of register arrays earlier. 5071 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 5072 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 5073 if (ICE->getSubExpr()->getType()->isArrayType()) 5074 return getPrimaryDecl(ICE->getSubExpr()); 5075 } 5076 return 0; 5077 } 5078 case Stmt::UnaryOperatorClass: { 5079 UnaryOperator *UO = cast<UnaryOperator>(E); 5080 5081 switch(UO->getOpcode()) { 5082 case UnaryOperator::Real: 5083 case UnaryOperator::Imag: 5084 case UnaryOperator::Extension: 5085 return getPrimaryDecl(UO->getSubExpr()); 5086 default: 5087 return 0; 5088 } 5089 } 5090 case Stmt::ParenExprClass: 5091 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 5092 case Stmt::ImplicitCastExprClass: 5093 // If the result of an implicit cast is an l-value, we care about 5094 // the sub-expression; otherwise, the result here doesn't matter. 5095 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 5096 default: 5097 return 0; 5098 } 5099} 5100 5101/// CheckAddressOfOperand - The operand of & must be either a function 5102/// designator or an lvalue designating an object. If it is an lvalue, the 5103/// object cannot be declared with storage class register or be a bit field. 5104/// Note: The usual conversions are *not* applied to the operand of the & 5105/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 5106/// In C++, the operand might be an overloaded function name, in which case 5107/// we allow the '&' but retain the overloaded-function type. 5108QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 5109 // Make sure to ignore parentheses in subsequent checks 5110 op = op->IgnoreParens(); 5111 5112 if (op->isTypeDependent()) 5113 return Context.DependentTy; 5114 5115 if (getLangOptions().C99) { 5116 // Implement C99-only parts of addressof rules. 5117 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 5118 if (uOp->getOpcode() == UnaryOperator::Deref) 5119 // Per C99 6.5.3.2, the address of a deref always returns a valid result 5120 // (assuming the deref expression is valid). 5121 return uOp->getSubExpr()->getType(); 5122 } 5123 // Technically, there should be a check for array subscript 5124 // expressions here, but the result of one is always an lvalue anyway. 5125 } 5126 NamedDecl *dcl = getPrimaryDecl(op); 5127 Expr::isLvalueResult lval = op->isLvalue(Context); 5128 5129 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 5130 // C99 6.5.3.2p1 5131 // The operand must be either an l-value or a function designator 5132 if (!op->getType()->isFunctionType()) { 5133 // FIXME: emit more specific diag... 5134 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 5135 << op->getSourceRange(); 5136 return QualType(); 5137 } 5138 } else if (op->getBitField()) { // C99 6.5.3.2p1 5139 // The operand cannot be a bit-field 5140 Diag(OpLoc, diag::err_typecheck_address_of) 5141 << "bit-field" << op->getSourceRange(); 5142 return QualType(); 5143 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 5144 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 5145 // The operand cannot be an element of a vector 5146 Diag(OpLoc, diag::err_typecheck_address_of) 5147 << "vector element" << op->getSourceRange(); 5148 return QualType(); 5149 } else if (isa<ObjCPropertyRefExpr>(op)) { 5150 // cannot take address of a property expression. 5151 Diag(OpLoc, diag::err_typecheck_address_of) 5152 << "property expression" << op->getSourceRange(); 5153 return QualType(); 5154 } else if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(op)) { 5155 // FIXME: Can LHS ever be null here? 5156 if (!CheckAddressOfOperand(CO->getTrueExpr(), OpLoc).isNull()) 5157 return CheckAddressOfOperand(CO->getFalseExpr(), OpLoc); 5158 } else if (dcl) { // C99 6.5.3.2p1 5159 // We have an lvalue with a decl. Make sure the decl is not declared 5160 // with the register storage-class specifier. 5161 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 5162 if (vd->getStorageClass() == VarDecl::Register) { 5163 Diag(OpLoc, diag::err_typecheck_address_of) 5164 << "register variable" << op->getSourceRange(); 5165 return QualType(); 5166 } 5167 } else if (isa<OverloadedFunctionDecl>(dcl) || 5168 isa<FunctionTemplateDecl>(dcl)) { 5169 return Context.OverloadTy; 5170 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 5171 // Okay: we can take the address of a field. 5172 // Could be a pointer to member, though, if there is an explicit 5173 // scope qualifier for the class. 5174 if (isa<QualifiedDeclRefExpr>(op)) { 5175 DeclContext *Ctx = dcl->getDeclContext(); 5176 if (Ctx && Ctx->isRecord()) { 5177 if (FD->getType()->isReferenceType()) { 5178 Diag(OpLoc, 5179 diag::err_cannot_form_pointer_to_member_of_reference_type) 5180 << FD->getDeclName() << FD->getType(); 5181 return QualType(); 5182 } 5183 5184 return Context.getMemberPointerType(op->getType(), 5185 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5186 } 5187 } 5188 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5189 // Okay: we can take the address of a function. 5190 // As above. 5191 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 5192 return Context.getMemberPointerType(op->getType(), 5193 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5194 } else if (!isa<FunctionDecl>(dcl)) 5195 assert(0 && "Unknown/unexpected decl type"); 5196 } 5197 5198 if (lval == Expr::LV_IncompleteVoidType) { 5199 // Taking the address of a void variable is technically illegal, but we 5200 // allow it in cases which are otherwise valid. 5201 // Example: "extern void x; void* y = &x;". 5202 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5203 } 5204 5205 // If the operand has type "type", the result has type "pointer to type". 5206 return Context.getPointerType(op->getType()); 5207} 5208 5209QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5210 if (Op->isTypeDependent()) 5211 return Context.DependentTy; 5212 5213 UsualUnaryConversions(Op); 5214 QualType Ty = Op->getType(); 5215 5216 // Note that per both C89 and C99, this is always legal, even if ptype is an 5217 // incomplete type or void. It would be possible to warn about dereferencing 5218 // a void pointer, but it's completely well-defined, and such a warning is 5219 // unlikely to catch any mistakes. 5220 if (const PointerType *PT = Ty->getAs<PointerType>()) 5221 return PT->getPointeeType(); 5222 5223 if (const ObjCObjectPointerType *OPT = Ty->getAs<ObjCObjectPointerType>()) 5224 return OPT->getPointeeType(); 5225 5226 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5227 << Ty << Op->getSourceRange(); 5228 return QualType(); 5229} 5230 5231static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5232 tok::TokenKind Kind) { 5233 BinaryOperator::Opcode Opc; 5234 switch (Kind) { 5235 default: assert(0 && "Unknown binop!"); 5236 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5237 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5238 case tok::star: Opc = BinaryOperator::Mul; break; 5239 case tok::slash: Opc = BinaryOperator::Div; break; 5240 case tok::percent: Opc = BinaryOperator::Rem; break; 5241 case tok::plus: Opc = BinaryOperator::Add; break; 5242 case tok::minus: Opc = BinaryOperator::Sub; break; 5243 case tok::lessless: Opc = BinaryOperator::Shl; break; 5244 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5245 case tok::lessequal: Opc = BinaryOperator::LE; break; 5246 case tok::less: Opc = BinaryOperator::LT; break; 5247 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5248 case tok::greater: Opc = BinaryOperator::GT; break; 5249 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5250 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5251 case tok::amp: Opc = BinaryOperator::And; break; 5252 case tok::caret: Opc = BinaryOperator::Xor; break; 5253 case tok::pipe: Opc = BinaryOperator::Or; break; 5254 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5255 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5256 case tok::equal: Opc = BinaryOperator::Assign; break; 5257 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5258 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5259 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5260 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5261 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5262 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5263 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5264 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5265 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5266 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5267 case tok::comma: Opc = BinaryOperator::Comma; break; 5268 } 5269 return Opc; 5270} 5271 5272static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5273 tok::TokenKind Kind) { 5274 UnaryOperator::Opcode Opc; 5275 switch (Kind) { 5276 default: assert(0 && "Unknown unary op!"); 5277 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5278 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5279 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5280 case tok::star: Opc = UnaryOperator::Deref; break; 5281 case tok::plus: Opc = UnaryOperator::Plus; break; 5282 case tok::minus: Opc = UnaryOperator::Minus; break; 5283 case tok::tilde: Opc = UnaryOperator::Not; break; 5284 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5285 case tok::kw___real: Opc = UnaryOperator::Real; break; 5286 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5287 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5288 } 5289 return Opc; 5290} 5291 5292/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5293/// operator @p Opc at location @c TokLoc. This routine only supports 5294/// built-in operations; ActOnBinOp handles overloaded operators. 5295Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5296 unsigned Op, 5297 Expr *lhs, Expr *rhs) { 5298 QualType ResultTy; // Result type of the binary operator. 5299 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5300 // The following two variables are used for compound assignment operators 5301 QualType CompLHSTy; // Type of LHS after promotions for computation 5302 QualType CompResultTy; // Type of computation result 5303 5304 switch (Opc) { 5305 case BinaryOperator::Assign: 5306 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5307 break; 5308 case BinaryOperator::PtrMemD: 5309 case BinaryOperator::PtrMemI: 5310 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5311 Opc == BinaryOperator::PtrMemI); 5312 break; 5313 case BinaryOperator::Mul: 5314 case BinaryOperator::Div: 5315 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5316 break; 5317 case BinaryOperator::Rem: 5318 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5319 break; 5320 case BinaryOperator::Add: 5321 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5322 break; 5323 case BinaryOperator::Sub: 5324 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5325 break; 5326 case BinaryOperator::Shl: 5327 case BinaryOperator::Shr: 5328 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5329 break; 5330 case BinaryOperator::LE: 5331 case BinaryOperator::LT: 5332 case BinaryOperator::GE: 5333 case BinaryOperator::GT: 5334 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5335 break; 5336 case BinaryOperator::EQ: 5337 case BinaryOperator::NE: 5338 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5339 break; 5340 case BinaryOperator::And: 5341 case BinaryOperator::Xor: 5342 case BinaryOperator::Or: 5343 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5344 break; 5345 case BinaryOperator::LAnd: 5346 case BinaryOperator::LOr: 5347 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5348 break; 5349 case BinaryOperator::MulAssign: 5350 case BinaryOperator::DivAssign: 5351 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5352 CompLHSTy = CompResultTy; 5353 if (!CompResultTy.isNull()) 5354 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5355 break; 5356 case BinaryOperator::RemAssign: 5357 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5358 CompLHSTy = CompResultTy; 5359 if (!CompResultTy.isNull()) 5360 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5361 break; 5362 case BinaryOperator::AddAssign: 5363 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5364 if (!CompResultTy.isNull()) 5365 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5366 break; 5367 case BinaryOperator::SubAssign: 5368 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5369 if (!CompResultTy.isNull()) 5370 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5371 break; 5372 case BinaryOperator::ShlAssign: 5373 case BinaryOperator::ShrAssign: 5374 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5375 CompLHSTy = CompResultTy; 5376 if (!CompResultTy.isNull()) 5377 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5378 break; 5379 case BinaryOperator::AndAssign: 5380 case BinaryOperator::XorAssign: 5381 case BinaryOperator::OrAssign: 5382 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5383 CompLHSTy = CompResultTy; 5384 if (!CompResultTy.isNull()) 5385 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5386 break; 5387 case BinaryOperator::Comma: 5388 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5389 break; 5390 } 5391 if (ResultTy.isNull()) 5392 return ExprError(); 5393 if (CompResultTy.isNull()) 5394 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5395 else 5396 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5397 CompLHSTy, CompResultTy, 5398 OpLoc)); 5399} 5400 5401// Binary Operators. 'Tok' is the token for the operator. 5402Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5403 tok::TokenKind Kind, 5404 ExprArg LHS, ExprArg RHS) { 5405 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5406 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5407 5408 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5409 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5410 5411 if (getLangOptions().CPlusPlus && 5412 (lhs->getType()->isOverloadableType() || 5413 rhs->getType()->isOverloadableType())) { 5414 // Find all of the overloaded operators visible from this 5415 // point. We perform both an operator-name lookup from the local 5416 // scope and an argument-dependent lookup based on the types of 5417 // the arguments. 5418 FunctionSet Functions; 5419 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5420 if (OverOp != OO_None) { 5421 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5422 Functions); 5423 Expr *Args[2] = { lhs, rhs }; 5424 DeclarationName OpName 5425 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5426 ArgumentDependentLookup(OpName, Args, 2, Functions); 5427 } 5428 5429 // Build the (potentially-overloaded, potentially-dependent) 5430 // binary operation. 5431 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5432 } 5433 5434 // Build a built-in binary operation. 5435 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5436} 5437 5438Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5439 unsigned OpcIn, 5440 ExprArg InputArg) { 5441 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5442 5443 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5444 Expr *Input = (Expr *)InputArg.get(); 5445 QualType resultType; 5446 switch (Opc) { 5447 case UnaryOperator::OffsetOf: 5448 assert(false && "Invalid unary operator"); 5449 break; 5450 5451 case UnaryOperator::PreInc: 5452 case UnaryOperator::PreDec: 5453 case UnaryOperator::PostInc: 5454 case UnaryOperator::PostDec: 5455 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5456 Opc == UnaryOperator::PreInc || 5457 Opc == UnaryOperator::PostInc); 5458 break; 5459 case UnaryOperator::AddrOf: 5460 resultType = CheckAddressOfOperand(Input, OpLoc); 5461 break; 5462 case UnaryOperator::Deref: 5463 DefaultFunctionArrayConversion(Input); 5464 resultType = CheckIndirectionOperand(Input, OpLoc); 5465 break; 5466 case UnaryOperator::Plus: 5467 case UnaryOperator::Minus: 5468 UsualUnaryConversions(Input); 5469 resultType = Input->getType(); 5470 if (resultType->isDependentType()) 5471 break; 5472 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5473 break; 5474 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5475 resultType->isEnumeralType()) 5476 break; 5477 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5478 Opc == UnaryOperator::Plus && 5479 resultType->isPointerType()) 5480 break; 5481 5482 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5483 << resultType << Input->getSourceRange()); 5484 case UnaryOperator::Not: // bitwise complement 5485 UsualUnaryConversions(Input); 5486 resultType = Input->getType(); 5487 if (resultType->isDependentType()) 5488 break; 5489 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5490 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5491 // C99 does not support '~' for complex conjugation. 5492 Diag(OpLoc, diag::ext_integer_complement_complex) 5493 << resultType << Input->getSourceRange(); 5494 else if (!resultType->isIntegerType()) 5495 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5496 << resultType << Input->getSourceRange()); 5497 break; 5498 case UnaryOperator::LNot: // logical negation 5499 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5500 DefaultFunctionArrayConversion(Input); 5501 resultType = Input->getType(); 5502 if (resultType->isDependentType()) 5503 break; 5504 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5505 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5506 << resultType << Input->getSourceRange()); 5507 // LNot always has type int. C99 6.5.3.3p5. 5508 // In C++, it's bool. C++ 5.3.1p8 5509 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5510 break; 5511 case UnaryOperator::Real: 5512 case UnaryOperator::Imag: 5513 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5514 break; 5515 case UnaryOperator::Extension: 5516 resultType = Input->getType(); 5517 break; 5518 } 5519 if (resultType.isNull()) 5520 return ExprError(); 5521 5522 InputArg.release(); 5523 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5524} 5525 5526// Unary Operators. 'Tok' is the token for the operator. 5527Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5528 tok::TokenKind Op, ExprArg input) { 5529 Expr *Input = (Expr*)input.get(); 5530 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5531 5532 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5533 // Find all of the overloaded operators visible from this 5534 // point. We perform both an operator-name lookup from the local 5535 // scope and an argument-dependent lookup based on the types of 5536 // the arguments. 5537 FunctionSet Functions; 5538 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5539 if (OverOp != OO_None) { 5540 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5541 Functions); 5542 DeclarationName OpName 5543 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5544 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5545 } 5546 5547 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5548 } 5549 5550 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5551} 5552 5553/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5554Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5555 SourceLocation LabLoc, 5556 IdentifierInfo *LabelII) { 5557 // Look up the record for this label identifier. 5558 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5559 5560 // If we haven't seen this label yet, create a forward reference. It 5561 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5562 if (LabelDecl == 0) 5563 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5564 5565 // Create the AST node. The address of a label always has type 'void*'. 5566 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5567 Context.getPointerType(Context.VoidTy))); 5568} 5569 5570Sema::OwningExprResult 5571Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5572 SourceLocation RPLoc) { // "({..})" 5573 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5574 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5575 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5576 5577 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5578 if (isFileScope) 5579 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5580 5581 // FIXME: there are a variety of strange constraints to enforce here, for 5582 // example, it is not possible to goto into a stmt expression apparently. 5583 // More semantic analysis is needed. 5584 5585 // If there are sub stmts in the compound stmt, take the type of the last one 5586 // as the type of the stmtexpr. 5587 QualType Ty = Context.VoidTy; 5588 5589 if (!Compound->body_empty()) { 5590 Stmt *LastStmt = Compound->body_back(); 5591 // If LastStmt is a label, skip down through into the body. 5592 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5593 LastStmt = Label->getSubStmt(); 5594 5595 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5596 Ty = LastExpr->getType(); 5597 } 5598 5599 // FIXME: Check that expression type is complete/non-abstract; statement 5600 // expressions are not lvalues. 5601 5602 substmt.release(); 5603 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5604} 5605 5606Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5607 SourceLocation BuiltinLoc, 5608 SourceLocation TypeLoc, 5609 TypeTy *argty, 5610 OffsetOfComponent *CompPtr, 5611 unsigned NumComponents, 5612 SourceLocation RPLoc) { 5613 // FIXME: This function leaks all expressions in the offset components on 5614 // error. 5615 // FIXME: Preserve type source info. 5616 QualType ArgTy = GetTypeFromParser(argty); 5617 assert(!ArgTy.isNull() && "Missing type argument!"); 5618 5619 bool Dependent = ArgTy->isDependentType(); 5620 5621 // We must have at least one component that refers to the type, and the first 5622 // one is known to be a field designator. Verify that the ArgTy represents 5623 // a struct/union/class. 5624 if (!Dependent && !ArgTy->isRecordType()) 5625 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5626 5627 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5628 // with an incomplete type would be illegal. 5629 5630 // Otherwise, create a null pointer as the base, and iteratively process 5631 // the offsetof designators. 5632 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5633 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5634 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5635 ArgTy, SourceLocation()); 5636 5637 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5638 // GCC extension, diagnose them. 5639 // FIXME: This diagnostic isn't actually visible because the location is in 5640 // a system header! 5641 if (NumComponents != 1) 5642 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5643 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5644 5645 if (!Dependent) { 5646 bool DidWarnAboutNonPOD = false; 5647 5648 // FIXME: Dependent case loses a lot of information here. And probably 5649 // leaks like a sieve. 5650 for (unsigned i = 0; i != NumComponents; ++i) { 5651 const OffsetOfComponent &OC = CompPtr[i]; 5652 if (OC.isBrackets) { 5653 // Offset of an array sub-field. TODO: Should we allow vector elements? 5654 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5655 if (!AT) { 5656 Res->Destroy(Context); 5657 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5658 << Res->getType()); 5659 } 5660 5661 // FIXME: C++: Verify that operator[] isn't overloaded. 5662 5663 // Promote the array so it looks more like a normal array subscript 5664 // expression. 5665 DefaultFunctionArrayConversion(Res); 5666 5667 // C99 6.5.2.1p1 5668 Expr *Idx = static_cast<Expr*>(OC.U.E); 5669 // FIXME: Leaks Res 5670 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5671 return ExprError(Diag(Idx->getLocStart(), 5672 diag::err_typecheck_subscript_not_integer) 5673 << Idx->getSourceRange()); 5674 5675 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5676 OC.LocEnd); 5677 continue; 5678 } 5679 5680 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5681 if (!RC) { 5682 Res->Destroy(Context); 5683 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5684 << Res->getType()); 5685 } 5686 5687 // Get the decl corresponding to this. 5688 RecordDecl *RD = RC->getDecl(); 5689 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5690 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5691 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5692 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5693 << Res->getType()); 5694 DidWarnAboutNonPOD = true; 5695 } 5696 } 5697 5698 LookupResult R; 5699 LookupQualifiedName(R, RD, OC.U.IdentInfo, LookupMemberName); 5700 5701 FieldDecl *MemberDecl 5702 = dyn_cast_or_null<FieldDecl>(R.getAsSingleDecl(Context)); 5703 // FIXME: Leaks Res 5704 if (!MemberDecl) 5705 return ExprError(Diag(BuiltinLoc, diag::err_no_member) 5706 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart, OC.LocEnd)); 5707 5708 // FIXME: C++: Verify that MemberDecl isn't a static field. 5709 // FIXME: Verify that MemberDecl isn't a bitfield. 5710 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5711 Res = BuildAnonymousStructUnionMemberReference( 5712 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5713 } else { 5714 // MemberDecl->getType() doesn't get the right qualifiers, but it 5715 // doesn't matter here. 5716 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5717 MemberDecl->getType().getNonReferenceType()); 5718 } 5719 } 5720 } 5721 5722 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5723 Context.getSizeType(), BuiltinLoc)); 5724} 5725 5726 5727Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5728 TypeTy *arg1,TypeTy *arg2, 5729 SourceLocation RPLoc) { 5730 // FIXME: Preserve type source info. 5731 QualType argT1 = GetTypeFromParser(arg1); 5732 QualType argT2 = GetTypeFromParser(arg2); 5733 5734 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5735 5736 if (getLangOptions().CPlusPlus) { 5737 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5738 << SourceRange(BuiltinLoc, RPLoc); 5739 return ExprError(); 5740 } 5741 5742 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5743 argT1, argT2, RPLoc)); 5744} 5745 5746Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5747 ExprArg cond, 5748 ExprArg expr1, ExprArg expr2, 5749 SourceLocation RPLoc) { 5750 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5751 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5752 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5753 5754 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5755 5756 QualType resType; 5757 bool ValueDependent = false; 5758 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5759 resType = Context.DependentTy; 5760 ValueDependent = true; 5761 } else { 5762 // The conditional expression is required to be a constant expression. 5763 llvm::APSInt condEval(32); 5764 SourceLocation ExpLoc; 5765 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5766 return ExprError(Diag(ExpLoc, 5767 diag::err_typecheck_choose_expr_requires_constant) 5768 << CondExpr->getSourceRange()); 5769 5770 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5771 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5772 ValueDependent = condEval.getZExtValue() ? LHSExpr->isValueDependent() 5773 : RHSExpr->isValueDependent(); 5774 } 5775 5776 cond.release(); expr1.release(); expr2.release(); 5777 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5778 resType, RPLoc, 5779 resType->isDependentType(), 5780 ValueDependent)); 5781} 5782 5783//===----------------------------------------------------------------------===// 5784// Clang Extensions. 5785//===----------------------------------------------------------------------===// 5786 5787/// ActOnBlockStart - This callback is invoked when a block literal is started. 5788void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5789 // Analyze block parameters. 5790 BlockSemaInfo *BSI = new BlockSemaInfo(); 5791 5792 // Add BSI to CurBlock. 5793 BSI->PrevBlockInfo = CurBlock; 5794 CurBlock = BSI; 5795 5796 BSI->ReturnType = QualType(); 5797 BSI->TheScope = BlockScope; 5798 BSI->hasBlockDeclRefExprs = false; 5799 BSI->hasPrototype = false; 5800 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5801 CurFunctionNeedsScopeChecking = false; 5802 5803 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5804 PushDeclContext(BlockScope, BSI->TheDecl); 5805} 5806 5807void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5808 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5809 5810 if (ParamInfo.getNumTypeObjects() == 0 5811 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5812 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5813 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5814 5815 if (T->isArrayType()) { 5816 Diag(ParamInfo.getSourceRange().getBegin(), 5817 diag::err_block_returns_array); 5818 return; 5819 } 5820 5821 // The parameter list is optional, if there was none, assume (). 5822 if (!T->isFunctionType()) 5823 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5824 5825 CurBlock->hasPrototype = true; 5826 CurBlock->isVariadic = false; 5827 // Check for a valid sentinel attribute on this block. 5828 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5829 Diag(ParamInfo.getAttributes()->getLoc(), 5830 diag::warn_attribute_sentinel_not_variadic) << 1; 5831 // FIXME: remove the attribute. 5832 } 5833 QualType RetTy = T.getTypePtr()->getAs<FunctionType>()->getResultType(); 5834 5835 // Do not allow returning a objc interface by-value. 5836 if (RetTy->isObjCInterfaceType()) { 5837 Diag(ParamInfo.getSourceRange().getBegin(), 5838 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5839 return; 5840 } 5841 return; 5842 } 5843 5844 // Analyze arguments to block. 5845 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5846 "Not a function declarator!"); 5847 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5848 5849 CurBlock->hasPrototype = FTI.hasPrototype; 5850 CurBlock->isVariadic = true; 5851 5852 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5853 // no arguments, not a function that takes a single void argument. 5854 if (FTI.hasPrototype && 5855 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5856 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5857 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5858 // empty arg list, don't push any params. 5859 CurBlock->isVariadic = false; 5860 } else if (FTI.hasPrototype) { 5861 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5862 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5863 CurBlock->isVariadic = FTI.isVariadic; 5864 } 5865 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5866 CurBlock->Params.size()); 5867 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5868 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5869 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5870 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5871 // If this has an identifier, add it to the scope stack. 5872 if ((*AI)->getIdentifier()) 5873 PushOnScopeChains(*AI, CurBlock->TheScope); 5874 5875 // Check for a valid sentinel attribute on this block. 5876 if (!CurBlock->isVariadic && 5877 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5878 Diag(ParamInfo.getAttributes()->getLoc(), 5879 diag::warn_attribute_sentinel_not_variadic) << 1; 5880 // FIXME: remove the attribute. 5881 } 5882 5883 // Analyze the return type. 5884 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5885 QualType RetTy = T->getAs<FunctionType>()->getResultType(); 5886 5887 // Do not allow returning a objc interface by-value. 5888 if (RetTy->isObjCInterfaceType()) { 5889 Diag(ParamInfo.getSourceRange().getBegin(), 5890 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5891 } else if (!RetTy->isDependentType()) 5892 CurBlock->ReturnType = RetTy; 5893} 5894 5895/// ActOnBlockError - If there is an error parsing a block, this callback 5896/// is invoked to pop the information about the block from the action impl. 5897void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5898 // Ensure that CurBlock is deleted. 5899 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5900 5901 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5902 5903 // Pop off CurBlock, handle nested blocks. 5904 PopDeclContext(); 5905 CurBlock = CurBlock->PrevBlockInfo; 5906 // FIXME: Delete the ParmVarDecl objects as well??? 5907} 5908 5909/// ActOnBlockStmtExpr - This is called when the body of a block statement 5910/// literal was successfully completed. ^(int x){...} 5911Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5912 StmtArg body, Scope *CurScope) { 5913 // If blocks are disabled, emit an error. 5914 if (!LangOpts.Blocks) 5915 Diag(CaretLoc, diag::err_blocks_disable); 5916 5917 // Ensure that CurBlock is deleted. 5918 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5919 5920 PopDeclContext(); 5921 5922 // Pop off CurBlock, handle nested blocks. 5923 CurBlock = CurBlock->PrevBlockInfo; 5924 5925 QualType RetTy = Context.VoidTy; 5926 if (!BSI->ReturnType.isNull()) 5927 RetTy = BSI->ReturnType; 5928 5929 llvm::SmallVector<QualType, 8> ArgTypes; 5930 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5931 ArgTypes.push_back(BSI->Params[i]->getType()); 5932 5933 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5934 QualType BlockTy; 5935 if (!BSI->hasPrototype) 5936 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5937 NoReturn); 5938 else 5939 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5940 BSI->isVariadic, 0, false, false, 0, 0, 5941 NoReturn); 5942 5943 // FIXME: Check that return/parameter types are complete/non-abstract 5944 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5945 BlockTy = Context.getBlockPointerType(BlockTy); 5946 5947 // If needed, diagnose invalid gotos and switches in the block. 5948 if (CurFunctionNeedsScopeChecking) 5949 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5950 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5951 5952 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5953 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5954 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5955 BSI->hasBlockDeclRefExprs)); 5956} 5957 5958Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5959 ExprArg expr, TypeTy *type, 5960 SourceLocation RPLoc) { 5961 QualType T = GetTypeFromParser(type); 5962 Expr *E = static_cast<Expr*>(expr.get()); 5963 Expr *OrigExpr = E; 5964 5965 InitBuiltinVaListType(); 5966 5967 // Get the va_list type 5968 QualType VaListType = Context.getBuiltinVaListType(); 5969 if (VaListType->isArrayType()) { 5970 // Deal with implicit array decay; for example, on x86-64, 5971 // va_list is an array, but it's supposed to decay to 5972 // a pointer for va_arg. 5973 VaListType = Context.getArrayDecayedType(VaListType); 5974 // Make sure the input expression also decays appropriately. 5975 UsualUnaryConversions(E); 5976 } else { 5977 // Otherwise, the va_list argument must be an l-value because 5978 // it is modified by va_arg. 5979 if (!E->isTypeDependent() && 5980 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5981 return ExprError(); 5982 } 5983 5984 if (!E->isTypeDependent() && 5985 !Context.hasSameType(VaListType, E->getType())) { 5986 return ExprError(Diag(E->getLocStart(), 5987 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5988 << OrigExpr->getType() << E->getSourceRange()); 5989 } 5990 5991 // FIXME: Check that type is complete/non-abstract 5992 // FIXME: Warn if a non-POD type is passed in. 5993 5994 expr.release(); 5995 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5996 RPLoc)); 5997} 5998 5999Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 6000 // The type of __null will be int or long, depending on the size of 6001 // pointers on the target. 6002 QualType Ty; 6003 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 6004 Ty = Context.IntTy; 6005 else 6006 Ty = Context.LongTy; 6007 6008 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 6009} 6010 6011bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 6012 SourceLocation Loc, 6013 QualType DstType, QualType SrcType, 6014 Expr *SrcExpr, const char *Flavor) { 6015 // Decode the result (notice that AST's are still created for extensions). 6016 bool isInvalid = false; 6017 unsigned DiagKind; 6018 switch (ConvTy) { 6019 default: assert(0 && "Unknown conversion type"); 6020 case Compatible: return false; 6021 case PointerToInt: 6022 DiagKind = diag::ext_typecheck_convert_pointer_int; 6023 break; 6024 case IntToPointer: 6025 DiagKind = diag::ext_typecheck_convert_int_pointer; 6026 break; 6027 case IncompatiblePointer: 6028 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 6029 break; 6030 case IncompatiblePointerSign: 6031 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 6032 break; 6033 case FunctionVoidPointer: 6034 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 6035 break; 6036 case CompatiblePointerDiscardsQualifiers: 6037 // If the qualifiers lost were because we were applying the 6038 // (deprecated) C++ conversion from a string literal to a char* 6039 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 6040 // Ideally, this check would be performed in 6041 // CheckPointerTypesForAssignment. However, that would require a 6042 // bit of refactoring (so that the second argument is an 6043 // expression, rather than a type), which should be done as part 6044 // of a larger effort to fix CheckPointerTypesForAssignment for 6045 // C++ semantics. 6046 if (getLangOptions().CPlusPlus && 6047 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 6048 return false; 6049 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 6050 break; 6051 case IntToBlockPointer: 6052 DiagKind = diag::err_int_to_block_pointer; 6053 break; 6054 case IncompatibleBlockPointer: 6055 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 6056 break; 6057 case IncompatibleObjCQualifiedId: 6058 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 6059 // it can give a more specific diagnostic. 6060 DiagKind = diag::warn_incompatible_qualified_id; 6061 break; 6062 case IncompatibleVectors: 6063 DiagKind = diag::warn_incompatible_vectors; 6064 break; 6065 case Incompatible: 6066 DiagKind = diag::err_typecheck_convert_incompatible; 6067 isInvalid = true; 6068 break; 6069 } 6070 6071 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 6072 << SrcExpr->getSourceRange(); 6073 return isInvalid; 6074} 6075 6076bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 6077 llvm::APSInt ICEResult; 6078 if (E->isIntegerConstantExpr(ICEResult, Context)) { 6079 if (Result) 6080 *Result = ICEResult; 6081 return false; 6082 } 6083 6084 Expr::EvalResult EvalResult; 6085 6086 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 6087 EvalResult.HasSideEffects) { 6088 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 6089 6090 if (EvalResult.Diag) { 6091 // We only show the note if it's not the usual "invalid subexpression" 6092 // or if it's actually in a subexpression. 6093 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 6094 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 6095 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6096 } 6097 6098 return true; 6099 } 6100 6101 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 6102 E->getSourceRange(); 6103 6104 if (EvalResult.Diag && 6105 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 6106 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6107 6108 if (Result) 6109 *Result = EvalResult.Val.getInt(); 6110 return false; 6111} 6112 6113Sema::ExpressionEvaluationContext 6114Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 6115 // Introduce a new set of potentially referenced declarations to the stack. 6116 if (NewContext == PotentiallyPotentiallyEvaluated) 6117 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 6118 6119 std::swap(ExprEvalContext, NewContext); 6120 return NewContext; 6121} 6122 6123void 6124Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 6125 ExpressionEvaluationContext NewContext) { 6126 ExprEvalContext = NewContext; 6127 6128 if (OldContext == PotentiallyPotentiallyEvaluated) { 6129 // Mark any remaining declarations in the current position of the stack 6130 // as "referenced". If they were not meant to be referenced, semantic 6131 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 6132 PotentiallyReferencedDecls RemainingDecls; 6133 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 6134 PotentiallyReferencedDeclStack.pop_back(); 6135 6136 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 6137 IEnd = RemainingDecls.end(); 6138 I != IEnd; ++I) 6139 MarkDeclarationReferenced(I->first, I->second); 6140 } 6141} 6142 6143/// \brief Note that the given declaration was referenced in the source code. 6144/// 6145/// This routine should be invoke whenever a given declaration is referenced 6146/// in the source code, and where that reference occurred. If this declaration 6147/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 6148/// C99 6.9p3), then the declaration will be marked as used. 6149/// 6150/// \param Loc the location where the declaration was referenced. 6151/// 6152/// \param D the declaration that has been referenced by the source code. 6153void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 6154 assert(D && "No declaration?"); 6155 6156 if (D->isUsed()) 6157 return; 6158 6159 // Mark a parameter or variable declaration "used", regardless of whether we're in a 6160 // template or not. The reason for this is that unevaluated expressions 6161 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and 6162 // -Wunused-parameters) 6163 if (isa<ParmVarDecl>(D) || 6164 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) 6165 D->setUsed(true); 6166 6167 // Do not mark anything as "used" within a dependent context; wait for 6168 // an instantiation. 6169 if (CurContext->isDependentContext()) 6170 return; 6171 6172 switch (ExprEvalContext) { 6173 case Unevaluated: 6174 // We are in an expression that is not potentially evaluated; do nothing. 6175 return; 6176 6177 case PotentiallyEvaluated: 6178 // We are in a potentially-evaluated expression, so this declaration is 6179 // "used"; handle this below. 6180 break; 6181 6182 case PotentiallyPotentiallyEvaluated: 6183 // We are in an expression that may be potentially evaluated; queue this 6184 // declaration reference until we know whether the expression is 6185 // potentially evaluated. 6186 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6187 return; 6188 } 6189 6190 // Note that this declaration has been used. 6191 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6192 unsigned TypeQuals; 6193 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6194 if (!Constructor->isUsed()) 6195 DefineImplicitDefaultConstructor(Loc, Constructor); 6196 } else if (Constructor->isImplicit() && 6197 Constructor->isCopyConstructor(Context, TypeQuals)) { 6198 if (!Constructor->isUsed()) 6199 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6200 } 6201 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6202 if (Destructor->isImplicit() && !Destructor->isUsed()) 6203 DefineImplicitDestructor(Loc, Destructor); 6204 6205 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6206 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6207 MethodDecl->getOverloadedOperator() == OO_Equal) { 6208 if (!MethodDecl->isUsed()) 6209 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6210 } 6211 } 6212 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6213 // Implicit instantiation of function templates and member functions of 6214 // class templates. 6215 if (!Function->getBody() && 6216 Function->getTemplateSpecializationKind() 6217 == TSK_ImplicitInstantiation) { 6218 bool AlreadyInstantiated = false; 6219 if (FunctionTemplateSpecializationInfo *SpecInfo 6220 = Function->getTemplateSpecializationInfo()) { 6221 if (SpecInfo->getPointOfInstantiation().isInvalid()) 6222 SpecInfo->setPointOfInstantiation(Loc); 6223 else 6224 AlreadyInstantiated = true; 6225 } else if (MemberSpecializationInfo *MSInfo 6226 = Function->getMemberSpecializationInfo()) { 6227 if (MSInfo->getPointOfInstantiation().isInvalid()) 6228 MSInfo->setPointOfInstantiation(Loc); 6229 else 6230 AlreadyInstantiated = true; 6231 } 6232 6233 if (!AlreadyInstantiated) 6234 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6235 } 6236 6237 // FIXME: keep track of references to static functions 6238 Function->setUsed(true); 6239 return; 6240 } 6241 6242 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6243 // Implicit instantiation of static data members of class templates. 6244 if (Var->isStaticDataMember() && 6245 Var->getInstantiatedFromStaticDataMember()) { 6246 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 6247 assert(MSInfo && "Missing member specialization information?"); 6248 if (MSInfo->getPointOfInstantiation().isInvalid() && 6249 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) { 6250 MSInfo->setPointOfInstantiation(Loc); 6251 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6252 } 6253 } 6254 6255 // FIXME: keep track of references to static data? 6256 6257 D->setUsed(true); 6258 return; 6259 } 6260} 6261 6262bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc, 6263 CallExpr *CE, FunctionDecl *FD) { 6264 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType()) 6265 return false; 6266 6267 PartialDiagnostic Note = 6268 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here) 6269 << FD->getDeclName() : PDiag(); 6270 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation(); 6271 6272 if (RequireCompleteType(Loc, ReturnType, 6273 FD ? 6274 PDiag(diag::err_call_function_incomplete_return) 6275 << CE->getSourceRange() << FD->getDeclName() : 6276 PDiag(diag::err_call_incomplete_return) 6277 << CE->getSourceRange(), 6278 std::make_pair(NoteLoc, Note))) 6279 return true; 6280 6281 return false; 6282} 6283 6284// Diagnose the common s/=/==/ typo. Note that adding parentheses 6285// will prevent this condition from triggering, which is what we want. 6286void Sema::DiagnoseAssignmentAsCondition(Expr *E) { 6287 SourceLocation Loc; 6288 6289 if (isa<BinaryOperator>(E)) { 6290 BinaryOperator *Op = cast<BinaryOperator>(E); 6291 if (Op->getOpcode() != BinaryOperator::Assign) 6292 return; 6293 6294 Loc = Op->getOperatorLoc(); 6295 } else if (isa<CXXOperatorCallExpr>(E)) { 6296 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E); 6297 if (Op->getOperator() != OO_Equal) 6298 return; 6299 6300 Loc = Op->getOperatorLoc(); 6301 } else { 6302 // Not an assignment. 6303 return; 6304 } 6305 6306 SourceLocation Open = E->getSourceRange().getBegin(); 6307 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd()); 6308 6309 Diag(Loc, diag::warn_condition_is_assignment) 6310 << E->getSourceRange() 6311 << CodeModificationHint::CreateInsertion(Open, "(") 6312 << CodeModificationHint::CreateInsertion(Close, ")"); 6313} 6314 6315bool Sema::CheckBooleanCondition(Expr *&E, SourceLocation Loc) { 6316 DiagnoseAssignmentAsCondition(E); 6317 6318 if (!E->isTypeDependent()) { 6319 DefaultFunctionArrayConversion(E); 6320 6321 QualType T = E->getType(); 6322 6323 if (getLangOptions().CPlusPlus) { 6324 if (CheckCXXBooleanCondition(E)) // C++ 6.4p4 6325 return true; 6326 } else if (!T->isScalarType()) { // C99 6.8.4.1p1 6327 Diag(Loc, diag::err_typecheck_statement_requires_scalar) 6328 << T << E->getSourceRange(); 6329 return true; 6330 } 6331 } 6332 6333 return false; 6334} 6335