SemaExpr.cpp revision bc2fb7fd319e8beaf899395ffa5b44ea833a648e
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{ 99 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 100 if (!attr) 101 return; 102 int sentinelPos = attr->getSentinel(); 103 int nullPos = attr->getNullPos(); 104 105 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 106 // base class. Then we won't be needing two versions of the same code. 107 unsigned int i = 0; 108 bool warnNotEnoughArgs = false; 109 int isMethod = 0; 110 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 111 // skip over named parameters. 112 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 113 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 114 if (nullPos) 115 --nullPos; 116 else 117 ++i; 118 } 119 warnNotEnoughArgs = (P != E || i >= NumArgs); 120 isMethod = 1; 121 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 122 // skip over named parameters. 123 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 124 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 125 if (nullPos) 126 --nullPos; 127 else 128 ++i; 129 } 130 warnNotEnoughArgs = (P != E || i >= NumArgs); 131 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 132 // block or function pointer call. 133 QualType Ty = V->getType(); 134 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 135 const FunctionType *FT = Ty->isFunctionPointerType() 136 ? Ty->getAs<PointerType>()->getPointeeType()->getAsFunctionType() 137 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAsFunctionType(); 138 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 139 unsigned NumArgsInProto = Proto->getNumArgs(); 140 unsigned k; 141 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 142 if (nullPos) 143 --nullPos; 144 else 145 ++i; 146 } 147 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 148 } 149 if (Ty->isBlockPointerType()) 150 isMethod = 2; 151 } else 152 return; 153 } else 154 return; 155 156 if (warnNotEnoughArgs) { 157 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 158 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 159 return; 160 } 161 int sentinel = i; 162 while (sentinelPos > 0 && i < NumArgs-1) { 163 --sentinelPos; 164 ++i; 165 } 166 if (sentinelPos > 0) { 167 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 168 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 169 return; 170 } 171 while (i < NumArgs-1) { 172 ++i; 173 ++sentinel; 174 } 175 Expr *sentinelExpr = Args[sentinel]; 176 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 177 !sentinelExpr->isNullPointerConstant(Context))) { 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->getAsBuiltinType()) 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 unsigned ExtraQuals = 0; 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 ExtraQuals 579 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 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 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 590 } else { 591 // We've found a member of an anonymous struct/union that is 592 // inside a non-anonymous struct/union, so in a well-formed 593 // program our base object expression is "this". 594 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 595 if (!MD->isStatic()) { 596 QualType AnonFieldType 597 = Context.getTagDeclType( 598 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 599 QualType ThisType = Context.getTagDeclType(MD->getParent()); 600 if ((Context.getCanonicalType(AnonFieldType) 601 == Context.getCanonicalType(ThisType)) || 602 IsDerivedFrom(ThisType, AnonFieldType)) { 603 // Our base object expression is "this". 604 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 605 MD->getThisType(Context)); 606 BaseObjectIsPointer = true; 607 } 608 } else { 609 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 610 << Field->getDeclName()); 611 } 612 ExtraQuals = MD->getTypeQualifiers(); 613 } 614 615 if (!BaseObjectExpr) 616 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 617 << Field->getDeclName()); 618 } 619 620 // Build the implicit member references to the field of the 621 // anonymous struct/union. 622 Expr *Result = BaseObjectExpr; 623 unsigned BaseAddrSpace = BaseObjectExpr->getType().getAddressSpace(); 624 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 625 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 626 FI != FIEnd; ++FI) { 627 QualType MemberType = (*FI)->getType(); 628 if (!(*FI)->isMutable()) { 629 unsigned combinedQualifiers 630 = MemberType.getCVRQualifiers() | ExtraQuals; 631 MemberType = MemberType.getQualifiedType(combinedQualifiers); 632 } 633 if (BaseAddrSpace != MemberType.getAddressSpace()) 634 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 635 MarkDeclarationReferenced(Loc, *FI); 636 // FIXME: Might this end up being a qualified name? 637 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 638 OpLoc, MemberType); 639 BaseObjectIsPointer = false; 640 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 641 } 642 643 return Owned(Result); 644} 645 646/// ActOnDeclarationNameExpr - The parser has read some kind of name 647/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 648/// performs lookup on that name and returns an expression that refers 649/// to that name. This routine isn't directly called from the parser, 650/// because the parser doesn't know about DeclarationName. Rather, 651/// this routine is called by ActOnIdentifierExpr, 652/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 653/// which form the DeclarationName from the corresponding syntactic 654/// forms. 655/// 656/// HasTrailingLParen indicates whether this identifier is used in a 657/// function call context. LookupCtx is only used for a C++ 658/// qualified-id (foo::bar) to indicate the class or namespace that 659/// the identifier must be a member of. 660/// 661/// isAddressOfOperand means that this expression is the direct operand 662/// of an address-of operator. This matters because this is the only 663/// situation where a qualified name referencing a non-static member may 664/// appear outside a member function of this class. 665Sema::OwningExprResult 666Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 667 DeclarationName Name, bool HasTrailingLParen, 668 const CXXScopeSpec *SS, 669 bool isAddressOfOperand) { 670 // Could be enum-constant, value decl, instance variable, etc. 671 if (SS && SS->isInvalid()) 672 return ExprError(); 673 674 // C++ [temp.dep.expr]p3: 675 // An id-expression is type-dependent if it contains: 676 // -- a nested-name-specifier that contains a class-name that 677 // names a dependent type. 678 // FIXME: Member of the current instantiation. 679 if (SS && isDependentScopeSpecifier(*SS)) { 680 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 681 Loc, SS->getRange(), 682 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 683 isAddressOfOperand)); 684 } 685 686 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 687 false, true, Loc); 688 689 if (Lookup.isAmbiguous()) { 690 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 691 SS && SS->isSet() ? SS->getRange() 692 : SourceRange()); 693 return ExprError(); 694 } 695 696 NamedDecl *D = Lookup.getAsDecl(); 697 698 // If this reference is in an Objective-C method, then ivar lookup happens as 699 // well. 700 IdentifierInfo *II = Name.getAsIdentifierInfo(); 701 if (II && getCurMethodDecl()) { 702 // There are two cases to handle here. 1) scoped lookup could have failed, 703 // in which case we should look for an ivar. 2) scoped lookup could have 704 // found a decl, but that decl is outside the current instance method (i.e. 705 // a global variable). In these two cases, we do a lookup for an ivar with 706 // this name, if the lookup sucedes, we replace it our current decl. 707 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 708 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 709 ObjCInterfaceDecl *ClassDeclared; 710 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 711 // Check if referencing a field with __attribute__((deprecated)). 712 if (DiagnoseUseOfDecl(IV, Loc)) 713 return ExprError(); 714 715 // If we're referencing an invalid decl, just return this as a silent 716 // error node. The error diagnostic was already emitted on the decl. 717 if (IV->isInvalidDecl()) 718 return ExprError(); 719 720 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 721 // If a class method attemps to use a free standing ivar, this is 722 // an error. 723 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 724 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 725 << IV->getDeclName()); 726 // If a class method uses a global variable, even if an ivar with 727 // same name exists, use the global. 728 if (!IsClsMethod) { 729 if (IV->getAccessControl() == ObjCIvarDecl::Private && 730 ClassDeclared != IFace) 731 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 732 // FIXME: This should use a new expr for a direct reference, don't 733 // turn this into Self->ivar, just return a BareIVarExpr or something. 734 IdentifierInfo &II = Context.Idents.get("self"); 735 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 736 II, false); 737 MarkDeclarationReferenced(Loc, IV); 738 return Owned(new (Context) 739 ObjCIvarRefExpr(IV, IV->getType(), Loc, 740 SelfExpr.takeAs<Expr>(), true, true)); 741 } 742 } 743 } else if (getCurMethodDecl()->isInstanceMethod()) { 744 // We should warn if a local variable hides an ivar. 745 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 746 ObjCInterfaceDecl *ClassDeclared; 747 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 748 if (IV->getAccessControl() != ObjCIvarDecl::Private || 749 IFace == ClassDeclared) 750 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 751 } 752 } 753 // Needed to implement property "super.method" notation. 754 if (D == 0 && II->isStr("super")) { 755 QualType T; 756 757 if (getCurMethodDecl()->isInstanceMethod()) 758 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 759 getCurMethodDecl()->getClassInterface())); 760 else 761 T = Context.getObjCClassType(); 762 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 763 } 764 } 765 766 // Determine whether this name might be a candidate for 767 // argument-dependent lookup. 768 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 769 HasTrailingLParen; 770 771 if (ADL && D == 0) { 772 // We've seen something of the form 773 // 774 // identifier( 775 // 776 // and we did not find any entity by the name 777 // "identifier". However, this identifier is still subject to 778 // argument-dependent lookup, so keep track of the name. 779 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 780 Context.OverloadTy, 781 Loc)); 782 } 783 784 if (D == 0) { 785 // Otherwise, this could be an implicitly declared function reference (legal 786 // in C90, extension in C99). 787 if (HasTrailingLParen && II && 788 !getLangOptions().CPlusPlus) // Not in C++. 789 D = ImplicitlyDefineFunction(Loc, *II, S); 790 else { 791 // If this name wasn't predeclared and if this is not a function call, 792 // diagnose the problem. 793 if (SS && !SS->isEmpty()) { 794 DiagnoseMissingMember(Loc, Name, 795 (NestedNameSpecifier *)SS->getScopeRep(), 796 SS->getRange()); 797 return ExprError(); 798 } else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 799 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 800 return ExprError(Diag(Loc, diag::err_undeclared_use) 801 << Name.getAsString()); 802 else 803 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 804 } 805 } 806 807 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 808 // Warn about constructs like: 809 // if (void *X = foo()) { ... } else { X }. 810 // In the else block, the pointer is always false. 811 812 // FIXME: In a template instantiation, we don't have scope 813 // information to check this property. 814 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 815 Scope *CheckS = S; 816 while (CheckS) { 817 if (CheckS->isWithinElse() && 818 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 819 if (Var->getType()->isBooleanType()) 820 ExprError(Diag(Loc, diag::warn_value_always_false) 821 << Var->getDeclName()); 822 else 823 ExprError(Diag(Loc, diag::warn_value_always_zero) 824 << Var->getDeclName()); 825 break; 826 } 827 828 // Move up one more control parent to check again. 829 CheckS = CheckS->getControlParent(); 830 if (CheckS) 831 CheckS = CheckS->getParent(); 832 } 833 } 834 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 835 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 836 // C99 DR 316 says that, if a function type comes from a 837 // function definition (without a prototype), that type is only 838 // used for checking compatibility. Therefore, when referencing 839 // the function, we pretend that we don't have the full function 840 // type. 841 if (DiagnoseUseOfDecl(Func, Loc)) 842 return ExprError(); 843 844 QualType T = Func->getType(); 845 QualType NoProtoType = T; 846 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 847 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 848 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 849 } 850 } 851 852 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 853} 854/// \brief Cast member's object to its own class if necessary. 855bool 856Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 857 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 858 if (CXXRecordDecl *RD = 859 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 860 QualType DestType = 861 Context.getCanonicalType(Context.getTypeDeclType(RD)); 862 if (DestType->isDependentType() || From->getType()->isDependentType()) 863 return false; 864 QualType FromRecordType = From->getType(); 865 QualType DestRecordType = DestType; 866 if (FromRecordType->getAs<PointerType>()) { 867 DestType = Context.getPointerType(DestType); 868 FromRecordType = FromRecordType->getPointeeType(); 869 } 870 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 871 CheckDerivedToBaseConversion(FromRecordType, 872 DestRecordType, 873 From->getSourceRange().getBegin(), 874 From->getSourceRange())) 875 return true; 876 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 877 /*isLvalue=*/true); 878 } 879 return false; 880} 881 882/// \brief Build a MemberExpr AST node. 883static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, 884 const CXXScopeSpec *SS, NamedDecl *Member, 885 SourceLocation Loc, QualType Ty) { 886 if (SS && SS->isSet()) 887 return MemberExpr::Create(C, Base, isArrow, 888 (NestedNameSpecifier *)SS->getScopeRep(), 889 SS->getRange(), Member, Loc, 890 // FIXME: Explicit template argument lists 891 false, SourceLocation(), 0, 0, SourceLocation(), 892 Ty); 893 894 return new (C) MemberExpr(Base, isArrow, Member, Loc, Ty); 895} 896 897/// \brief Complete semantic analysis for a reference to the given declaration. 898Sema::OwningExprResult 899Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 900 bool HasTrailingLParen, 901 const CXXScopeSpec *SS, 902 bool isAddressOfOperand) { 903 assert(D && "Cannot refer to a NULL declaration"); 904 DeclarationName Name = D->getDeclName(); 905 906 // If this is an expression of the form &Class::member, don't build an 907 // implicit member ref, because we want a pointer to the member in general, 908 // not any specific instance's member. 909 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 910 DeclContext *DC = computeDeclContext(*SS); 911 if (D && isa<CXXRecordDecl>(DC)) { 912 QualType DType; 913 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 914 DType = FD->getType().getNonReferenceType(); 915 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 916 DType = Method->getType(); 917 } else if (isa<OverloadedFunctionDecl>(D)) { 918 DType = Context.OverloadTy; 919 } 920 // Could be an inner type. That's diagnosed below, so ignore it here. 921 if (!DType.isNull()) { 922 // The pointer is type- and value-dependent if it points into something 923 // dependent. 924 bool Dependent = DC->isDependentContext(); 925 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 926 } 927 } 928 } 929 930 // We may have found a field within an anonymous union or struct 931 // (C++ [class.union]). 932 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 933 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 934 return BuildAnonymousStructUnionMemberReference(Loc, FD); 935 936 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 937 if (!MD->isStatic()) { 938 // C++ [class.mfct.nonstatic]p2: 939 // [...] if name lookup (3.4.1) resolves the name in the 940 // id-expression to a nonstatic nontype member of class X or of 941 // a base class of X, the id-expression is transformed into a 942 // class member access expression (5.2.5) using (*this) (9.3.2) 943 // as the postfix-expression to the left of the '.' operator. 944 DeclContext *Ctx = 0; 945 QualType MemberType; 946 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 947 Ctx = FD->getDeclContext(); 948 MemberType = FD->getType(); 949 950 if (const ReferenceType *RefType = MemberType->getAs<ReferenceType>()) 951 MemberType = RefType->getPointeeType(); 952 else if (!FD->isMutable()) { 953 unsigned combinedQualifiers 954 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 955 MemberType = MemberType.getQualifiedType(combinedQualifiers); 956 } 957 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 958 if (!Method->isStatic()) { 959 Ctx = Method->getParent(); 960 MemberType = Method->getType(); 961 } 962 } else if (FunctionTemplateDecl *FunTmpl 963 = dyn_cast<FunctionTemplateDecl>(D)) { 964 if (CXXMethodDecl *Method 965 = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())) { 966 if (!Method->isStatic()) { 967 Ctx = Method->getParent(); 968 MemberType = Context.OverloadTy; 969 } 970 } 971 } else if (OverloadedFunctionDecl *Ovl 972 = dyn_cast<OverloadedFunctionDecl>(D)) { 973 // FIXME: We need an abstraction for iterating over one or more function 974 // templates or functions. This code is far too repetitive! 975 for (OverloadedFunctionDecl::function_iterator 976 Func = Ovl->function_begin(), 977 FuncEnd = Ovl->function_end(); 978 Func != FuncEnd; ++Func) { 979 CXXMethodDecl *DMethod = 0; 980 if (FunctionTemplateDecl *FunTmpl 981 = dyn_cast<FunctionTemplateDecl>(*Func)) 982 DMethod = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 983 else 984 DMethod = dyn_cast<CXXMethodDecl>(*Func); 985 986 if (DMethod && !DMethod->isStatic()) { 987 Ctx = DMethod->getDeclContext(); 988 MemberType = Context.OverloadTy; 989 break; 990 } 991 } 992 } 993 994 if (Ctx && Ctx->isRecord()) { 995 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 996 QualType ThisType = Context.getTagDeclType(MD->getParent()); 997 if ((Context.getCanonicalType(CtxType) 998 == Context.getCanonicalType(ThisType)) || 999 IsDerivedFrom(ThisType, CtxType)) { 1000 // Build the implicit member access expression. 1001 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1002 MD->getThisType(Context)); 1003 MarkDeclarationReferenced(Loc, D); 1004 if (PerformObjectMemberConversion(This, D)) 1005 return ExprError(); 1006 if (DiagnoseUseOfDecl(D, Loc)) 1007 return ExprError(); 1008 return Owned(BuildMemberExpr(Context, This, true, SS, D, 1009 Loc, MemberType)); 1010 } 1011 } 1012 } 1013 } 1014 1015 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1016 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1017 if (MD->isStatic()) 1018 // "invalid use of member 'x' in static member function" 1019 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1020 << FD->getDeclName()); 1021 } 1022 1023 // Any other ways we could have found the field in a well-formed 1024 // program would have been turned into implicit member expressions 1025 // above. 1026 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1027 << FD->getDeclName()); 1028 } 1029 1030 if (isa<TypedefDecl>(D)) 1031 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1032 if (isa<ObjCInterfaceDecl>(D)) 1033 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1034 if (isa<NamespaceDecl>(D)) 1035 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1036 1037 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1038 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1039 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1040 false, false, SS); 1041 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1042 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1043 false, false, SS); 1044 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 1045 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 1046 /*TypeDependent=*/true, 1047 /*ValueDependent=*/true, SS); 1048 1049 ValueDecl *VD = cast<ValueDecl>(D); 1050 1051 // Check whether this declaration can be used. Note that we suppress 1052 // this check when we're going to perform argument-dependent lookup 1053 // on this function name, because this might not be the function 1054 // that overload resolution actually selects. 1055 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1056 HasTrailingLParen; 1057 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1058 return ExprError(); 1059 1060 // Only create DeclRefExpr's for valid Decl's. 1061 if (VD->isInvalidDecl()) 1062 return ExprError(); 1063 1064 // If the identifier reference is inside a block, and it refers to a value 1065 // that is outside the block, create a BlockDeclRefExpr instead of a 1066 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1067 // the block is formed. 1068 // 1069 // We do not do this for things like enum constants, global variables, etc, 1070 // as they do not get snapshotted. 1071 // 1072 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1073 MarkDeclarationReferenced(Loc, VD); 1074 QualType ExprTy = VD->getType().getNonReferenceType(); 1075 // The BlocksAttr indicates the variable is bound by-reference. 1076 if (VD->getAttr<BlocksAttr>()) 1077 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1078 // This is to record that a 'const' was actually synthesize and added. 1079 bool constAdded = !ExprTy.isConstQualified(); 1080 // Variable will be bound by-copy, make it const within the closure. 1081 1082 ExprTy.addConst(); 1083 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1084 constAdded)); 1085 } 1086 // If this reference is not in a block or if the referenced variable is 1087 // within the block, create a normal DeclRefExpr. 1088 1089 bool TypeDependent = false; 1090 bool ValueDependent = false; 1091 if (getLangOptions().CPlusPlus) { 1092 // C++ [temp.dep.expr]p3: 1093 // An id-expression is type-dependent if it contains: 1094 // - an identifier that was declared with a dependent type, 1095 if (VD->getType()->isDependentType()) 1096 TypeDependent = true; 1097 // - FIXME: a template-id that is dependent, 1098 // - a conversion-function-id that specifies a dependent type, 1099 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1100 Name.getCXXNameType()->isDependentType()) 1101 TypeDependent = true; 1102 // - a nested-name-specifier that contains a class-name that 1103 // names a dependent type. 1104 else if (SS && !SS->isEmpty()) { 1105 for (DeclContext *DC = computeDeclContext(*SS); 1106 DC; DC = DC->getParent()) { 1107 // FIXME: could stop early at namespace scope. 1108 if (DC->isRecord()) { 1109 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1110 if (Context.getTypeDeclType(Record)->isDependentType()) { 1111 TypeDependent = true; 1112 break; 1113 } 1114 } 1115 } 1116 } 1117 1118 // C++ [temp.dep.constexpr]p2: 1119 // 1120 // An identifier is value-dependent if it is: 1121 // - a name declared with a dependent type, 1122 if (TypeDependent) 1123 ValueDependent = true; 1124 // - the name of a non-type template parameter, 1125 else if (isa<NonTypeTemplateParmDecl>(VD)) 1126 ValueDependent = true; 1127 // - a constant with integral or enumeration type and is 1128 // initialized with an expression that is value-dependent 1129 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1130 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1131 Dcl->getInit()) { 1132 ValueDependent = Dcl->getInit()->isValueDependent(); 1133 } 1134 } 1135 } 1136 1137 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1138 TypeDependent, ValueDependent, SS); 1139} 1140 1141Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1142 tok::TokenKind Kind) { 1143 PredefinedExpr::IdentType IT; 1144 1145 switch (Kind) { 1146 default: assert(0 && "Unknown simple primary expr!"); 1147 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1148 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1149 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1150 } 1151 1152 // Pre-defined identifiers are of type char[x], where x is the length of the 1153 // string. 1154 unsigned Length; 1155 if (FunctionDecl *FD = getCurFunctionDecl()) 1156 Length = FD->getIdentifier()->getLength(); 1157 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1158 Length = MD->getSynthesizedMethodSize(); 1159 else { 1160 Diag(Loc, diag::ext_predef_outside_function); 1161 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1162 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1163 } 1164 1165 1166 llvm::APInt LengthI(32, Length + 1); 1167 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1168 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1169 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1170} 1171 1172Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1173 llvm::SmallString<16> CharBuffer; 1174 CharBuffer.resize(Tok.getLength()); 1175 const char *ThisTokBegin = &CharBuffer[0]; 1176 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1177 1178 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1179 Tok.getLocation(), PP); 1180 if (Literal.hadError()) 1181 return ExprError(); 1182 1183 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1184 1185 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1186 Literal.isWide(), 1187 type, Tok.getLocation())); 1188} 1189 1190Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1191 // Fast path for a single digit (which is quite common). A single digit 1192 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1193 if (Tok.getLength() == 1) { 1194 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1195 unsigned IntSize = Context.Target.getIntWidth(); 1196 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1197 Context.IntTy, Tok.getLocation())); 1198 } 1199 1200 llvm::SmallString<512> IntegerBuffer; 1201 // Add padding so that NumericLiteralParser can overread by one character. 1202 IntegerBuffer.resize(Tok.getLength()+1); 1203 const char *ThisTokBegin = &IntegerBuffer[0]; 1204 1205 // Get the spelling of the token, which eliminates trigraphs, etc. 1206 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1207 1208 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1209 Tok.getLocation(), PP); 1210 if (Literal.hadError) 1211 return ExprError(); 1212 1213 Expr *Res; 1214 1215 if (Literal.isFloatingLiteral()) { 1216 QualType Ty; 1217 if (Literal.isFloat) 1218 Ty = Context.FloatTy; 1219 else if (!Literal.isLong) 1220 Ty = Context.DoubleTy; 1221 else 1222 Ty = Context.LongDoubleTy; 1223 1224 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1225 1226 // isExact will be set by GetFloatValue(). 1227 bool isExact = false; 1228 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1229 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1230 1231 } else if (!Literal.isIntegerLiteral()) { 1232 return ExprError(); 1233 } else { 1234 QualType Ty; 1235 1236 // long long is a C99 feature. 1237 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1238 Literal.isLongLong) 1239 Diag(Tok.getLocation(), diag::ext_longlong); 1240 1241 // Get the value in the widest-possible width. 1242 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1243 1244 if (Literal.GetIntegerValue(ResultVal)) { 1245 // If this value didn't fit into uintmax_t, warn and force to ull. 1246 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1247 Ty = Context.UnsignedLongLongTy; 1248 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1249 "long long is not intmax_t?"); 1250 } else { 1251 // If this value fits into a ULL, try to figure out what else it fits into 1252 // according to the rules of C99 6.4.4.1p5. 1253 1254 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1255 // be an unsigned int. 1256 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1257 1258 // Check from smallest to largest, picking the smallest type we can. 1259 unsigned Width = 0; 1260 if (!Literal.isLong && !Literal.isLongLong) { 1261 // Are int/unsigned possibilities? 1262 unsigned IntSize = Context.Target.getIntWidth(); 1263 1264 // Does it fit in a unsigned int? 1265 if (ResultVal.isIntN(IntSize)) { 1266 // Does it fit in a signed int? 1267 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1268 Ty = Context.IntTy; 1269 else if (AllowUnsigned) 1270 Ty = Context.UnsignedIntTy; 1271 Width = IntSize; 1272 } 1273 } 1274 1275 // Are long/unsigned long possibilities? 1276 if (Ty.isNull() && !Literal.isLongLong) { 1277 unsigned LongSize = Context.Target.getLongWidth(); 1278 1279 // Does it fit in a unsigned long? 1280 if (ResultVal.isIntN(LongSize)) { 1281 // Does it fit in a signed long? 1282 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1283 Ty = Context.LongTy; 1284 else if (AllowUnsigned) 1285 Ty = Context.UnsignedLongTy; 1286 Width = LongSize; 1287 } 1288 } 1289 1290 // Finally, check long long if needed. 1291 if (Ty.isNull()) { 1292 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1293 1294 // Does it fit in a unsigned long long? 1295 if (ResultVal.isIntN(LongLongSize)) { 1296 // Does it fit in a signed long long? 1297 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1298 Ty = Context.LongLongTy; 1299 else if (AllowUnsigned) 1300 Ty = Context.UnsignedLongLongTy; 1301 Width = LongLongSize; 1302 } 1303 } 1304 1305 // If we still couldn't decide a type, we probably have something that 1306 // does not fit in a signed long long, but has no U suffix. 1307 if (Ty.isNull()) { 1308 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1309 Ty = Context.UnsignedLongLongTy; 1310 Width = Context.Target.getLongLongWidth(); 1311 } 1312 1313 if (ResultVal.getBitWidth() != Width) 1314 ResultVal.trunc(Width); 1315 } 1316 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1317 } 1318 1319 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1320 if (Literal.isImaginary) 1321 Res = new (Context) ImaginaryLiteral(Res, 1322 Context.getComplexType(Res->getType())); 1323 1324 return Owned(Res); 1325} 1326 1327Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1328 SourceLocation R, ExprArg Val) { 1329 Expr *E = Val.takeAs<Expr>(); 1330 assert((E != 0) && "ActOnParenExpr() missing expr"); 1331 return Owned(new (Context) ParenExpr(L, R, E)); 1332} 1333 1334/// The UsualUnaryConversions() function is *not* called by this routine. 1335/// See C99 6.3.2.1p[2-4] for more details. 1336bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1337 SourceLocation OpLoc, 1338 const SourceRange &ExprRange, 1339 bool isSizeof) { 1340 if (exprType->isDependentType()) 1341 return false; 1342 1343 // C99 6.5.3.4p1: 1344 if (isa<FunctionType>(exprType)) { 1345 // alignof(function) is allowed as an extension. 1346 if (isSizeof) 1347 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1348 return false; 1349 } 1350 1351 // Allow sizeof(void)/alignof(void) as an extension. 1352 if (exprType->isVoidType()) { 1353 Diag(OpLoc, diag::ext_sizeof_void_type) 1354 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1355 return false; 1356 } 1357 1358 if (RequireCompleteType(OpLoc, exprType, 1359 isSizeof ? diag::err_sizeof_incomplete_type : 1360 PDiag(diag::err_alignof_incomplete_type) 1361 << ExprRange)) 1362 return true; 1363 1364 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1365 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1366 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1367 << exprType << isSizeof << ExprRange; 1368 return true; 1369 } 1370 1371 return false; 1372} 1373 1374bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1375 const SourceRange &ExprRange) { 1376 E = E->IgnoreParens(); 1377 1378 // alignof decl is always ok. 1379 if (isa<DeclRefExpr>(E)) 1380 return false; 1381 1382 // Cannot know anything else if the expression is dependent. 1383 if (E->isTypeDependent()) 1384 return false; 1385 1386 if (E->getBitField()) { 1387 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1388 return true; 1389 } 1390 1391 // Alignment of a field access is always okay, so long as it isn't a 1392 // bit-field. 1393 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1394 if (isa<FieldDecl>(ME->getMemberDecl())) 1395 return false; 1396 1397 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1398} 1399 1400/// \brief Build a sizeof or alignof expression given a type operand. 1401Action::OwningExprResult 1402Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1403 bool isSizeOf, SourceRange R) { 1404 if (T.isNull()) 1405 return ExprError(); 1406 1407 if (!T->isDependentType() && 1408 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1409 return ExprError(); 1410 1411 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1412 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1413 Context.getSizeType(), OpLoc, 1414 R.getEnd())); 1415} 1416 1417/// \brief Build a sizeof or alignof expression given an expression 1418/// operand. 1419Action::OwningExprResult 1420Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1421 bool isSizeOf, SourceRange R) { 1422 // Verify that the operand is valid. 1423 bool isInvalid = false; 1424 if (E->isTypeDependent()) { 1425 // Delay type-checking for type-dependent expressions. 1426 } else if (!isSizeOf) { 1427 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1428 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1429 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1430 isInvalid = true; 1431 } else { 1432 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1433 } 1434 1435 if (isInvalid) 1436 return ExprError(); 1437 1438 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1439 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1440 Context.getSizeType(), OpLoc, 1441 R.getEnd())); 1442} 1443 1444/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1445/// the same for @c alignof and @c __alignof 1446/// Note that the ArgRange is invalid if isType is false. 1447Action::OwningExprResult 1448Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1449 void *TyOrEx, const SourceRange &ArgRange) { 1450 // If error parsing type, ignore. 1451 if (TyOrEx == 0) return ExprError(); 1452 1453 if (isType) { 1454 // FIXME: Preserve type source info. 1455 QualType ArgTy = GetTypeFromParser(TyOrEx); 1456 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1457 } 1458 1459 // Get the end location. 1460 Expr *ArgEx = (Expr *)TyOrEx; 1461 Action::OwningExprResult Result 1462 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1463 1464 if (Result.isInvalid()) 1465 DeleteExpr(ArgEx); 1466 1467 return move(Result); 1468} 1469 1470QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1471 if (V->isTypeDependent()) 1472 return Context.DependentTy; 1473 1474 // These operators return the element type of a complex type. 1475 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1476 return CT->getElementType(); 1477 1478 // Otherwise they pass through real integer and floating point types here. 1479 if (V->getType()->isArithmeticType()) 1480 return V->getType(); 1481 1482 // Reject anything else. 1483 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1484 << (isReal ? "__real" : "__imag"); 1485 return QualType(); 1486} 1487 1488 1489 1490Action::OwningExprResult 1491Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1492 tok::TokenKind Kind, ExprArg Input) { 1493 // Since this might be a postfix expression, get rid of ParenListExprs. 1494 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1495 Expr *Arg = (Expr *)Input.get(); 1496 1497 UnaryOperator::Opcode Opc; 1498 switch (Kind) { 1499 default: assert(0 && "Unknown unary op!"); 1500 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1501 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1502 } 1503 1504 if (getLangOptions().CPlusPlus && 1505 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1506 // Which overloaded operator? 1507 OverloadedOperatorKind OverOp = 1508 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1509 1510 // C++ [over.inc]p1: 1511 // 1512 // [...] If the function is a member function with one 1513 // parameter (which shall be of type int) or a non-member 1514 // function with two parameters (the second of which shall be 1515 // of type int), it defines the postfix increment operator ++ 1516 // for objects of that type. When the postfix increment is 1517 // called as a result of using the ++ operator, the int 1518 // argument will have value zero. 1519 Expr *Args[2] = { 1520 Arg, 1521 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1522 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1523 }; 1524 1525 // Build the candidate set for overloading 1526 OverloadCandidateSet CandidateSet; 1527 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1528 1529 // Perform overload resolution. 1530 OverloadCandidateSet::iterator Best; 1531 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1532 case OR_Success: { 1533 // We found a built-in operator or an overloaded operator. 1534 FunctionDecl *FnDecl = Best->Function; 1535 1536 if (FnDecl) { 1537 // We matched an overloaded operator. Build a call to that 1538 // operator. 1539 1540 // Convert the arguments. 1541 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1542 if (PerformObjectArgumentInitialization(Arg, Method)) 1543 return ExprError(); 1544 } else { 1545 // Convert the arguments. 1546 if (PerformCopyInitialization(Arg, 1547 FnDecl->getParamDecl(0)->getType(), 1548 "passing")) 1549 return ExprError(); 1550 } 1551 1552 // Determine the result type 1553 QualType ResultTy 1554 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1555 ResultTy = ResultTy.getNonReferenceType(); 1556 1557 // Build the actual expression node. 1558 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1559 SourceLocation()); 1560 UsualUnaryConversions(FnExpr); 1561 1562 Input.release(); 1563 Args[0] = Arg; 1564 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1565 Args, 2, ResultTy, 1566 OpLoc)); 1567 } else { 1568 // We matched a built-in operator. Convert the arguments, then 1569 // break out so that we will build the appropriate built-in 1570 // operator node. 1571 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1572 "passing")) 1573 return ExprError(); 1574 1575 break; 1576 } 1577 } 1578 1579 case OR_No_Viable_Function: 1580 // No viable function; fall through to handling this as a 1581 // built-in operator, which will produce an error message for us. 1582 break; 1583 1584 case OR_Ambiguous: 1585 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1586 << UnaryOperator::getOpcodeStr(Opc) 1587 << Arg->getSourceRange(); 1588 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1589 return ExprError(); 1590 1591 case OR_Deleted: 1592 Diag(OpLoc, diag::err_ovl_deleted_oper) 1593 << Best->Function->isDeleted() 1594 << UnaryOperator::getOpcodeStr(Opc) 1595 << Arg->getSourceRange(); 1596 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1597 return ExprError(); 1598 } 1599 1600 // Either we found no viable overloaded operator or we matched a 1601 // built-in operator. In either case, fall through to trying to 1602 // build a built-in operation. 1603 } 1604 1605 Input.release(); 1606 Input = Arg; 1607 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1608} 1609 1610Action::OwningExprResult 1611Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1612 ExprArg Idx, SourceLocation RLoc) { 1613 // Since this might be a postfix expression, get rid of ParenListExprs. 1614 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1615 1616 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1617 *RHSExp = static_cast<Expr*>(Idx.get()); 1618 1619 if (getLangOptions().CPlusPlus && 1620 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1621 Base.release(); 1622 Idx.release(); 1623 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1624 Context.DependentTy, RLoc)); 1625 } 1626 1627 if (getLangOptions().CPlusPlus && 1628 (LHSExp->getType()->isRecordType() || 1629 LHSExp->getType()->isEnumeralType() || 1630 RHSExp->getType()->isRecordType() || 1631 RHSExp->getType()->isEnumeralType())) { 1632 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1633 // to the candidate set. 1634 OverloadCandidateSet CandidateSet; 1635 Expr *Args[2] = { LHSExp, RHSExp }; 1636 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1637 SourceRange(LLoc, RLoc)); 1638 1639 // Perform overload resolution. 1640 OverloadCandidateSet::iterator Best; 1641 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1642 case OR_Success: { 1643 // We found a built-in operator or an overloaded operator. 1644 FunctionDecl *FnDecl = Best->Function; 1645 1646 if (FnDecl) { 1647 // We matched an overloaded operator. Build a call to that 1648 // operator. 1649 1650 // Convert the arguments. 1651 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1652 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1653 PerformCopyInitialization(RHSExp, 1654 FnDecl->getParamDecl(0)->getType(), 1655 "passing")) 1656 return ExprError(); 1657 } else { 1658 // Convert the arguments. 1659 if (PerformCopyInitialization(LHSExp, 1660 FnDecl->getParamDecl(0)->getType(), 1661 "passing") || 1662 PerformCopyInitialization(RHSExp, 1663 FnDecl->getParamDecl(1)->getType(), 1664 "passing")) 1665 return ExprError(); 1666 } 1667 1668 // Determine the result type 1669 QualType ResultTy 1670 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1671 ResultTy = ResultTy.getNonReferenceType(); 1672 1673 // Build the actual expression node. 1674 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1675 SourceLocation()); 1676 UsualUnaryConversions(FnExpr); 1677 1678 Base.release(); 1679 Idx.release(); 1680 Args[0] = LHSExp; 1681 Args[1] = RHSExp; 1682 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1683 FnExpr, Args, 2, 1684 ResultTy, LLoc)); 1685 } else { 1686 // We matched a built-in operator. Convert the arguments, then 1687 // break out so that we will build the appropriate built-in 1688 // operator node. 1689 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1690 "passing") || 1691 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1692 "passing")) 1693 return ExprError(); 1694 1695 break; 1696 } 1697 } 1698 1699 case OR_No_Viable_Function: 1700 // No viable function; fall through to handling this as a 1701 // built-in operator, which will produce an error message for us. 1702 break; 1703 1704 case OR_Ambiguous: 1705 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1706 << "[]" 1707 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1708 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1709 return ExprError(); 1710 1711 case OR_Deleted: 1712 Diag(LLoc, diag::err_ovl_deleted_oper) 1713 << Best->Function->isDeleted() 1714 << "[]" 1715 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1716 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1717 return ExprError(); 1718 } 1719 1720 // Either we found no viable overloaded operator or we matched a 1721 // built-in operator. In either case, fall through to trying to 1722 // build a built-in operation. 1723 } 1724 1725 // Perform default conversions. 1726 DefaultFunctionArrayConversion(LHSExp); 1727 DefaultFunctionArrayConversion(RHSExp); 1728 1729 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1730 1731 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1732 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1733 // in the subscript position. As a result, we need to derive the array base 1734 // and index from the expression types. 1735 Expr *BaseExpr, *IndexExpr; 1736 QualType ResultType; 1737 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1738 BaseExpr = LHSExp; 1739 IndexExpr = RHSExp; 1740 ResultType = Context.DependentTy; 1741 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1742 BaseExpr = LHSExp; 1743 IndexExpr = RHSExp; 1744 ResultType = PTy->getPointeeType(); 1745 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1746 // Handle the uncommon case of "123[Ptr]". 1747 BaseExpr = RHSExp; 1748 IndexExpr = LHSExp; 1749 ResultType = PTy->getPointeeType(); 1750 } else if (const ObjCObjectPointerType *PTy = 1751 LHSTy->getAsObjCObjectPointerType()) { 1752 BaseExpr = LHSExp; 1753 IndexExpr = RHSExp; 1754 ResultType = PTy->getPointeeType(); 1755 } else if (const ObjCObjectPointerType *PTy = 1756 RHSTy->getAsObjCObjectPointerType()) { 1757 // Handle the uncommon case of "123[Ptr]". 1758 BaseExpr = RHSExp; 1759 IndexExpr = LHSExp; 1760 ResultType = PTy->getPointeeType(); 1761 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1762 BaseExpr = LHSExp; // vectors: V[123] 1763 IndexExpr = RHSExp; 1764 1765 // FIXME: need to deal with const... 1766 ResultType = VTy->getElementType(); 1767 } else if (LHSTy->isArrayType()) { 1768 // If we see an array that wasn't promoted by 1769 // DefaultFunctionArrayConversion, it must be an array that 1770 // wasn't promoted because of the C90 rule that doesn't 1771 // allow promoting non-lvalue arrays. Warn, then 1772 // force the promotion here. 1773 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1774 LHSExp->getSourceRange(); 1775 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1776 LHSTy = LHSExp->getType(); 1777 1778 BaseExpr = LHSExp; 1779 IndexExpr = RHSExp; 1780 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1781 } else if (RHSTy->isArrayType()) { 1782 // Same as previous, except for 123[f().a] case 1783 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1784 RHSExp->getSourceRange(); 1785 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1786 RHSTy = RHSExp->getType(); 1787 1788 BaseExpr = RHSExp; 1789 IndexExpr = LHSExp; 1790 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1791 } else { 1792 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1793 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1794 } 1795 // C99 6.5.2.1p1 1796 if (!(IndexExpr->getType()->isIntegerType() && 1797 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1798 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1799 << IndexExpr->getSourceRange()); 1800 1801 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1802 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1803 // type. Note that Functions are not objects, and that (in C99 parlance) 1804 // incomplete types are not object types. 1805 if (ResultType->isFunctionType()) { 1806 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1807 << ResultType << BaseExpr->getSourceRange(); 1808 return ExprError(); 1809 } 1810 1811 if (!ResultType->isDependentType() && 1812 RequireCompleteType(LLoc, ResultType, 1813 PDiag(diag::err_subscript_incomplete_type) 1814 << BaseExpr->getSourceRange())) 1815 return ExprError(); 1816 1817 // Diagnose bad cases where we step over interface counts. 1818 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1819 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1820 << ResultType << BaseExpr->getSourceRange(); 1821 return ExprError(); 1822 } 1823 1824 Base.release(); 1825 Idx.release(); 1826 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1827 ResultType, RLoc)); 1828} 1829 1830QualType Sema:: 1831CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1832 const IdentifierInfo *CompName, 1833 SourceLocation CompLoc) { 1834 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1835 1836 // The vector accessor can't exceed the number of elements. 1837 const char *compStr = CompName->getName(); 1838 1839 // This flag determines whether or not the component is one of the four 1840 // special names that indicate a subset of exactly half the elements are 1841 // to be selected. 1842 bool HalvingSwizzle = false; 1843 1844 // This flag determines whether or not CompName has an 's' char prefix, 1845 // indicating that it is a string of hex values to be used as vector indices. 1846 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1847 1848 // Check that we've found one of the special components, or that the component 1849 // names must come from the same set. 1850 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1851 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1852 HalvingSwizzle = true; 1853 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1854 do 1855 compStr++; 1856 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1857 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1858 do 1859 compStr++; 1860 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1861 } 1862 1863 if (!HalvingSwizzle && *compStr) { 1864 // We didn't get to the end of the string. This means the component names 1865 // didn't come from the same set *or* we encountered an illegal name. 1866 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1867 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1868 return QualType(); 1869 } 1870 1871 // Ensure no component accessor exceeds the width of the vector type it 1872 // operates on. 1873 if (!HalvingSwizzle) { 1874 compStr = CompName->getName(); 1875 1876 if (HexSwizzle) 1877 compStr++; 1878 1879 while (*compStr) { 1880 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1881 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1882 << baseType << SourceRange(CompLoc); 1883 return QualType(); 1884 } 1885 } 1886 } 1887 1888 // If this is a halving swizzle, verify that the base type has an even 1889 // number of elements. 1890 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1891 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1892 << baseType << SourceRange(CompLoc); 1893 return QualType(); 1894 } 1895 1896 // The component accessor looks fine - now we need to compute the actual type. 1897 // The vector type is implied by the component accessor. For example, 1898 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1899 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1900 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1901 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1902 : CompName->getLength(); 1903 if (HexSwizzle) 1904 CompSize--; 1905 1906 if (CompSize == 1) 1907 return vecType->getElementType(); 1908 1909 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1910 // Now look up the TypeDefDecl from the vector type. Without this, 1911 // diagostics look bad. We want extended vector types to appear built-in. 1912 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1913 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1914 return Context.getTypedefType(ExtVectorDecls[i]); 1915 } 1916 return VT; // should never get here (a typedef type should always be found). 1917} 1918 1919static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1920 IdentifierInfo *Member, 1921 const Selector &Sel, 1922 ASTContext &Context) { 1923 1924 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1925 return PD; 1926 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1927 return OMD; 1928 1929 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1930 E = PDecl->protocol_end(); I != E; ++I) { 1931 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1932 Context)) 1933 return D; 1934 } 1935 return 0; 1936} 1937 1938static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1939 IdentifierInfo *Member, 1940 const Selector &Sel, 1941 ASTContext &Context) { 1942 // Check protocols on qualified interfaces. 1943 Decl *GDecl = 0; 1944 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1945 E = QIdTy->qual_end(); I != E; ++I) { 1946 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1947 GDecl = PD; 1948 break; 1949 } 1950 // Also must look for a getter name which uses property syntax. 1951 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1952 GDecl = OMD; 1953 break; 1954 } 1955 } 1956 if (!GDecl) { 1957 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1958 E = QIdTy->qual_end(); I != E; ++I) { 1959 // Search in the protocol-qualifier list of current protocol. 1960 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1961 if (GDecl) 1962 return GDecl; 1963 } 1964 } 1965 return GDecl; 1966} 1967 1968/// FindMethodInNestedImplementations - Look up a method in current and 1969/// all base class implementations. 1970/// 1971ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1972 const ObjCInterfaceDecl *IFace, 1973 const Selector &Sel) { 1974 ObjCMethodDecl *Method = 0; 1975 if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation()) 1976 Method = ImpDecl->getInstanceMethod(Sel); 1977 1978 if (!Method && IFace->getSuperClass()) 1979 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1980 return Method; 1981} 1982 1983Action::OwningExprResult 1984Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1985 tok::TokenKind OpKind, SourceLocation MemberLoc, 1986 DeclarationName MemberName, 1987 bool HasExplicitTemplateArgs, 1988 SourceLocation LAngleLoc, 1989 const TemplateArgument *ExplicitTemplateArgs, 1990 unsigned NumExplicitTemplateArgs, 1991 SourceLocation RAngleLoc, 1992 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 1993 NamedDecl *FirstQualifierInScope) { 1994 if (SS && SS->isInvalid()) 1995 return ExprError(); 1996 1997 // Since this might be a postfix expression, get rid of ParenListExprs. 1998 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1999 2000 Expr *BaseExpr = Base.takeAs<Expr>(); 2001 assert(BaseExpr && "no record expression"); 2002 2003 // Perform default conversions. 2004 DefaultFunctionArrayConversion(BaseExpr); 2005 2006 QualType BaseType = BaseExpr->getType(); 2007 // If this is an Objective-C pseudo-builtin and a definition is provided then 2008 // use that. 2009 if (BaseType->isObjCIdType()) { 2010 // We have an 'id' type. Rather than fall through, we check if this 2011 // is a reference to 'isa'. 2012 if (BaseType != Context.ObjCIdRedefinitionType) { 2013 BaseType = Context.ObjCIdRedefinitionType; 2014 ImpCastExprToType(BaseExpr, BaseType); 2015 } 2016 } else if (BaseType->isObjCClassType() && 2017 BaseType != Context.ObjCClassRedefinitionType) { 2018 BaseType = Context.ObjCClassRedefinitionType; 2019 ImpCastExprToType(BaseExpr, BaseType); 2020 } 2021 assert(!BaseType.isNull() && "no type for member expression"); 2022 2023 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2024 // must have pointer type, and the accessed type is the pointee. 2025 if (OpKind == tok::arrow) { 2026 if (BaseType->isDependentType()) { 2027 NestedNameSpecifier *Qualifier = 0; 2028 if (SS) { 2029 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2030 if (!FirstQualifierInScope) 2031 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2032 } 2033 2034 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2035 BaseExpr, true, 2036 OpLoc, 2037 Qualifier, 2038 SS? SS->getRange() : SourceRange(), 2039 FirstQualifierInScope, 2040 MemberName, 2041 MemberLoc)); 2042 } 2043 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2044 BaseType = PT->getPointeeType(); 2045 else if (BaseType->isObjCObjectPointerType()) 2046 ; 2047 else 2048 return ExprError(Diag(MemberLoc, 2049 diag::err_typecheck_member_reference_arrow) 2050 << BaseType << BaseExpr->getSourceRange()); 2051 } else { 2052 if (BaseType->isDependentType()) { 2053 // Require that the base type isn't a pointer type 2054 // (so we'll report an error for) 2055 // T* t; 2056 // t.f; 2057 // 2058 // In Obj-C++, however, the above expression is valid, since it could be 2059 // accessing the 'f' property if T is an Obj-C interface. The extra check 2060 // allows this, while still reporting an error if T is a struct pointer. 2061 const PointerType *PT = BaseType->getAs<PointerType>(); 2062 2063 if (!PT || (getLangOptions().ObjC1 && 2064 !PT->getPointeeType()->isRecordType())) { 2065 NestedNameSpecifier *Qualifier = 0; 2066 if (SS) { 2067 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2068 if (!FirstQualifierInScope) 2069 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2070 } 2071 2072 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2073 BaseExpr, false, 2074 OpLoc, 2075 Qualifier, 2076 SS? SS->getRange() : SourceRange(), 2077 FirstQualifierInScope, 2078 MemberName, 2079 MemberLoc)); 2080 } 2081 } 2082 } 2083 2084 // Handle field access to simple records. This also handles access to fields 2085 // of the ObjC 'id' struct. 2086 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2087 RecordDecl *RDecl = RTy->getDecl(); 2088 if (RequireCompleteType(OpLoc, BaseType, 2089 PDiag(diag::err_typecheck_incomplete_tag) 2090 << BaseExpr->getSourceRange())) 2091 return ExprError(); 2092 2093 DeclContext *DC = RDecl; 2094 if (SS && SS->isSet()) { 2095 // If the member name was a qualified-id, look into the 2096 // nested-name-specifier. 2097 DC = computeDeclContext(*SS, false); 2098 2099 // FIXME: If DC is not computable, we should build a 2100 // CXXUnresolvedMemberExpr. 2101 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2102 } 2103 2104 // The record definition is complete, now make sure the member is valid. 2105 LookupResult Result 2106 = LookupQualifiedName(DC, MemberName, LookupMemberName, false); 2107 2108 if (!Result) 2109 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member_deprecated) 2110 << MemberName << BaseExpr->getSourceRange()); 2111 if (Result.isAmbiguous()) { 2112 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2113 BaseExpr->getSourceRange()); 2114 return ExprError(); 2115 } 2116 2117 if (SS && SS->isSet()) { 2118 QualType BaseTypeCanon 2119 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2120 QualType MemberTypeCanon 2121 = Context.getCanonicalType( 2122 Context.getTypeDeclType( 2123 dyn_cast<TypeDecl>(Result.getAsDecl()->getDeclContext()))); 2124 2125 if (BaseTypeCanon != MemberTypeCanon && 2126 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2127 return ExprError(Diag(SS->getBeginLoc(), 2128 diag::err_not_direct_base_or_virtual) 2129 << MemberTypeCanon << BaseTypeCanon); 2130 } 2131 2132 NamedDecl *MemberDecl = Result; 2133 2134 // If the decl being referenced had an error, return an error for this 2135 // sub-expr without emitting another error, in order to avoid cascading 2136 // error cases. 2137 if (MemberDecl->isInvalidDecl()) 2138 return ExprError(); 2139 2140 // Check the use of this field 2141 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2142 return ExprError(); 2143 2144 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2145 // We may have found a field within an anonymous union or struct 2146 // (C++ [class.union]). 2147 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2148 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2149 BaseExpr, OpLoc); 2150 2151 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2152 QualType MemberType = FD->getType(); 2153 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2154 MemberType = Ref->getPointeeType(); 2155 else { 2156 unsigned BaseAddrSpace = BaseType.getAddressSpace(); 2157 unsigned combinedQualifiers = 2158 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2159 if (FD->isMutable()) 2160 combinedQualifiers &= ~QualType::Const; 2161 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2162 if (BaseAddrSpace != MemberType.getAddressSpace()) 2163 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 2164 } 2165 2166 MarkDeclarationReferenced(MemberLoc, FD); 2167 if (PerformObjectMemberConversion(BaseExpr, FD)) 2168 return ExprError(); 2169 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2170 FD, MemberLoc, MemberType)); 2171 } 2172 2173 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2174 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2175 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2176 Var, MemberLoc, 2177 Var->getType().getNonReferenceType())); 2178 } 2179 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2180 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2181 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2182 MemberFn, MemberLoc, 2183 MemberFn->getType())); 2184 } 2185 if (FunctionTemplateDecl *FunTmpl 2186 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2187 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2188 2189 if (HasExplicitTemplateArgs) 2190 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2191 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2192 SS? SS->getRange() : SourceRange(), 2193 FunTmpl, MemberLoc, true, 2194 LAngleLoc, ExplicitTemplateArgs, 2195 NumExplicitTemplateArgs, RAngleLoc, 2196 Context.OverloadTy)); 2197 2198 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2199 FunTmpl, MemberLoc, 2200 Context.OverloadTy)); 2201 } 2202 if (OverloadedFunctionDecl *Ovl 2203 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2204 if (HasExplicitTemplateArgs) 2205 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2206 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2207 SS? SS->getRange() : SourceRange(), 2208 Ovl, MemberLoc, true, 2209 LAngleLoc, ExplicitTemplateArgs, 2210 NumExplicitTemplateArgs, RAngleLoc, 2211 Context.OverloadTy)); 2212 2213 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2214 Ovl, MemberLoc, Context.OverloadTy)); 2215 } 2216 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2217 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2218 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2219 Enum, MemberLoc, Enum->getType())); 2220 } 2221 if (isa<TypeDecl>(MemberDecl)) 2222 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2223 << MemberName << int(OpKind == tok::arrow)); 2224 2225 // We found a declaration kind that we didn't expect. This is a 2226 // generic error message that tells the user that she can't refer 2227 // to this member with '.' or '->'. 2228 return ExprError(Diag(MemberLoc, 2229 diag::err_typecheck_member_reference_unknown) 2230 << MemberName << int(OpKind == tok::arrow)); 2231 } 2232 2233 // Handle properties on ObjC 'Class' types. 2234 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2235 // Also must look for a getter name which uses property syntax. 2236 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2237 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2238 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2239 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2240 ObjCMethodDecl *Getter; 2241 // FIXME: need to also look locally in the implementation. 2242 if ((Getter = IFace->lookupClassMethod(Sel))) { 2243 // Check the use of this method. 2244 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2245 return ExprError(); 2246 } 2247 // If we found a getter then this may be a valid dot-reference, we 2248 // will look for the matching setter, in case it is needed. 2249 Selector SetterSel = 2250 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2251 PP.getSelectorTable(), Member); 2252 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2253 if (!Setter) { 2254 // If this reference is in an @implementation, also check for 'private' 2255 // methods. 2256 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2257 } 2258 // Look through local category implementations associated with the class. 2259 if (!Setter) 2260 Setter = IFace->getCategoryClassMethod(SetterSel); 2261 2262 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2263 return ExprError(); 2264 2265 if (Getter || Setter) { 2266 QualType PType; 2267 2268 if (Getter) 2269 PType = Getter->getResultType(); 2270 else 2271 // Get the expression type from Setter's incoming parameter. 2272 PType = (*(Setter->param_end() -1))->getType(); 2273 // FIXME: we must check that the setter has property type. 2274 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2275 Setter, MemberLoc, BaseExpr)); 2276 } 2277 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2278 << MemberName << BaseType); 2279 } 2280 } 2281 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2282 // (*Obj).ivar. 2283 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2284 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2285 const ObjCObjectPointerType *OPT = BaseType->getAsObjCObjectPointerType(); 2286 const ObjCInterfaceType *IFaceT = 2287 OPT ? OPT->getInterfaceType() : BaseType->getAsObjCInterfaceType(); 2288 if (IFaceT) { 2289 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2290 2291 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2292 ObjCInterfaceDecl *ClassDeclared; 2293 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2294 2295 if (IV) { 2296 // If the decl being referenced had an error, return an error for this 2297 // sub-expr without emitting another error, in order to avoid cascading 2298 // error cases. 2299 if (IV->isInvalidDecl()) 2300 return ExprError(); 2301 2302 // Check whether we can reference this field. 2303 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2304 return ExprError(); 2305 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2306 IV->getAccessControl() != ObjCIvarDecl::Package) { 2307 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2308 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2309 ClassOfMethodDecl = MD->getClassInterface(); 2310 else if (ObjCImpDecl && getCurFunctionDecl()) { 2311 // Case of a c-function declared inside an objc implementation. 2312 // FIXME: For a c-style function nested inside an objc implementation 2313 // class, there is no implementation context available, so we pass 2314 // down the context as argument to this routine. Ideally, this context 2315 // need be passed down in the AST node and somehow calculated from the 2316 // AST for a function decl. 2317 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2318 if (ObjCImplementationDecl *IMPD = 2319 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2320 ClassOfMethodDecl = IMPD->getClassInterface(); 2321 else if (ObjCCategoryImplDecl* CatImplClass = 2322 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2323 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2324 } 2325 2326 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2327 if (ClassDeclared != IDecl || 2328 ClassOfMethodDecl != ClassDeclared) 2329 Diag(MemberLoc, diag::error_private_ivar_access) 2330 << IV->getDeclName(); 2331 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2332 // @protected 2333 Diag(MemberLoc, diag::error_protected_ivar_access) 2334 << IV->getDeclName(); 2335 } 2336 2337 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2338 MemberLoc, BaseExpr, 2339 OpKind == tok::arrow)); 2340 } 2341 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2342 << IDecl->getDeclName() << MemberName 2343 << BaseExpr->getSourceRange()); 2344 } 2345 } 2346 // Handle properties on 'id' and qualified "id". 2347 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2348 BaseType->isObjCQualifiedIdType())) { 2349 const ObjCObjectPointerType *QIdTy = BaseType->getAsObjCObjectPointerType(); 2350 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2351 2352 // Check protocols on qualified interfaces. 2353 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2354 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2355 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2356 // Check the use of this declaration 2357 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2358 return ExprError(); 2359 2360 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2361 MemberLoc, BaseExpr)); 2362 } 2363 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2364 // Check the use of this method. 2365 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2366 return ExprError(); 2367 2368 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2369 OMD->getResultType(), 2370 OMD, OpLoc, MemberLoc, 2371 NULL, 0)); 2372 } 2373 } 2374 2375 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2376 << MemberName << BaseType); 2377 } 2378 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2379 // pointer to a (potentially qualified) interface type. 2380 const ObjCObjectPointerType *OPT; 2381 if (OpKind == tok::period && 2382 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2383 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2384 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2385 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2386 2387 // Search for a declared property first. 2388 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2389 // Check whether we can reference this property. 2390 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2391 return ExprError(); 2392 QualType ResTy = PD->getType(); 2393 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2394 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2395 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2396 ResTy = Getter->getResultType(); 2397 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2398 MemberLoc, BaseExpr)); 2399 } 2400 // Check protocols on qualified interfaces. 2401 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2402 E = OPT->qual_end(); I != E; ++I) 2403 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2404 // Check whether we can reference this property. 2405 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2406 return ExprError(); 2407 2408 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2409 MemberLoc, BaseExpr)); 2410 } 2411 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2412 E = OPT->qual_end(); I != E; ++I) 2413 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2414 // Check whether we can reference this property. 2415 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2416 return ExprError(); 2417 2418 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2419 MemberLoc, BaseExpr)); 2420 } 2421 // If that failed, look for an "implicit" property by seeing if the nullary 2422 // selector is implemented. 2423 2424 // FIXME: The logic for looking up nullary and unary selectors should be 2425 // shared with the code in ActOnInstanceMessage. 2426 2427 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2428 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2429 2430 // If this reference is in an @implementation, check for 'private' methods. 2431 if (!Getter) 2432 Getter = FindMethodInNestedImplementations(IFace, Sel); 2433 2434 // Look through local category implementations associated with the class. 2435 if (!Getter) 2436 Getter = IFace->getCategoryInstanceMethod(Sel); 2437 if (Getter) { 2438 // Check if we can reference this property. 2439 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2440 return ExprError(); 2441 } 2442 // If we found a getter then this may be a valid dot-reference, we 2443 // will look for the matching setter, in case it is needed. 2444 Selector SetterSel = 2445 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2446 PP.getSelectorTable(), Member); 2447 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2448 if (!Setter) { 2449 // If this reference is in an @implementation, also check for 'private' 2450 // methods. 2451 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2452 } 2453 // Look through local category implementations associated with the class. 2454 if (!Setter) 2455 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2456 2457 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2458 return ExprError(); 2459 2460 if (Getter || Setter) { 2461 QualType PType; 2462 2463 if (Getter) 2464 PType = Getter->getResultType(); 2465 else 2466 // Get the expression type from Setter's incoming parameter. 2467 PType = (*(Setter->param_end() -1))->getType(); 2468 // FIXME: we must check that the setter has property type. 2469 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2470 Setter, MemberLoc, BaseExpr)); 2471 } 2472 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2473 << MemberName << BaseType); 2474 } 2475 2476 // Handle the following exceptional case (*Obj).isa. 2477 if (OpKind == tok::period && 2478 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2479 MemberName.getAsIdentifierInfo()->isStr("isa")) 2480 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2481 Context.getObjCIdType())); 2482 2483 // Handle 'field access' to vectors, such as 'V.xx'. 2484 if (BaseType->isExtVectorType()) { 2485 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2486 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2487 if (ret.isNull()) 2488 return ExprError(); 2489 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2490 MemberLoc)); 2491 } 2492 2493 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2494 << BaseType << BaseExpr->getSourceRange(); 2495 2496 // If the user is trying to apply -> or . to a function or function 2497 // pointer, it's probably because they forgot parentheses to call 2498 // the function. Suggest the addition of those parentheses. 2499 if (BaseType == Context.OverloadTy || 2500 BaseType->isFunctionType() || 2501 (BaseType->isPointerType() && 2502 BaseType->getAs<PointerType>()->isFunctionType())) { 2503 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2504 Diag(Loc, diag::note_member_reference_needs_call) 2505 << CodeModificationHint::CreateInsertion(Loc, "()"); 2506 } 2507 2508 return ExprError(); 2509} 2510 2511Action::OwningExprResult 2512Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2513 tok::TokenKind OpKind, SourceLocation MemberLoc, 2514 IdentifierInfo &Member, 2515 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2516 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2517 DeclarationName(&Member), ObjCImpDecl, SS); 2518} 2519 2520Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2521 FunctionDecl *FD, 2522 ParmVarDecl *Param) { 2523 if (Param->hasUnparsedDefaultArg()) { 2524 Diag (CallLoc, 2525 diag::err_use_of_default_argument_to_function_declared_later) << 2526 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2527 Diag(UnparsedDefaultArgLocs[Param], 2528 diag::note_default_argument_declared_here); 2529 } else { 2530 if (Param->hasUninstantiatedDefaultArg()) { 2531 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2532 2533 // Instantiate the expression. 2534 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2535 2536 // FIXME: We should really make a new InstantiatingTemplate ctor 2537 // that has a better message - right now we're just piggy-backing 2538 // off the "default template argument" error message. 2539 InstantiatingTemplate Inst(*this, CallLoc, FD->getPrimaryTemplate(), 2540 ArgList.getInnermost().getFlatArgumentList(), 2541 ArgList.getInnermost().flat_size()); 2542 2543 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2544 if (Result.isInvalid()) 2545 return ExprError(); 2546 2547 if (SetParamDefaultArgument(Param, move(Result), 2548 /*FIXME:EqualLoc*/ 2549 UninstExpr->getSourceRange().getBegin())) 2550 return ExprError(); 2551 } 2552 2553 Expr *DefaultExpr = Param->getDefaultArg(); 2554 2555 // If the default expression creates temporaries, we need to 2556 // push them to the current stack of expression temporaries so they'll 2557 // be properly destroyed. 2558 if (CXXExprWithTemporaries *E 2559 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2560 assert(!E->shouldDestroyTemporaries() && 2561 "Can't destroy temporaries in a default argument expr!"); 2562 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2563 ExprTemporaries.push_back(E->getTemporary(I)); 2564 } 2565 } 2566 2567 // We already type-checked the argument, so we know it works. 2568 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2569} 2570 2571/// ConvertArgumentsForCall - Converts the arguments specified in 2572/// Args/NumArgs to the parameter types of the function FDecl with 2573/// function prototype Proto. Call is the call expression itself, and 2574/// Fn is the function expression. For a C++ member function, this 2575/// routine does not attempt to convert the object argument. Returns 2576/// true if the call is ill-formed. 2577bool 2578Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2579 FunctionDecl *FDecl, 2580 const FunctionProtoType *Proto, 2581 Expr **Args, unsigned NumArgs, 2582 SourceLocation RParenLoc) { 2583 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2584 // assignment, to the types of the corresponding parameter, ... 2585 unsigned NumArgsInProto = Proto->getNumArgs(); 2586 unsigned NumArgsToCheck = NumArgs; 2587 bool Invalid = false; 2588 2589 // If too few arguments are available (and we don't have default 2590 // arguments for the remaining parameters), don't make the call. 2591 if (NumArgs < NumArgsInProto) { 2592 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2593 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2594 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2595 // Use default arguments for missing arguments 2596 NumArgsToCheck = NumArgsInProto; 2597 Call->setNumArgs(Context, NumArgsInProto); 2598 } 2599 2600 // If too many are passed and not variadic, error on the extras and drop 2601 // them. 2602 if (NumArgs > NumArgsInProto) { 2603 if (!Proto->isVariadic()) { 2604 Diag(Args[NumArgsInProto]->getLocStart(), 2605 diag::err_typecheck_call_too_many_args) 2606 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2607 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2608 Args[NumArgs-1]->getLocEnd()); 2609 // This deletes the extra arguments. 2610 Call->setNumArgs(Context, NumArgsInProto); 2611 Invalid = true; 2612 } 2613 NumArgsToCheck = NumArgsInProto; 2614 } 2615 2616 // Continue to check argument types (even if we have too few/many args). 2617 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2618 QualType ProtoArgType = Proto->getArgType(i); 2619 2620 Expr *Arg; 2621 if (i < NumArgs) { 2622 Arg = Args[i]; 2623 2624 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2625 ProtoArgType, 2626 PDiag(diag::err_call_incomplete_argument) 2627 << Arg->getSourceRange())) 2628 return true; 2629 2630 // Pass the argument. 2631 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2632 return true; 2633 } else { 2634 ParmVarDecl *Param = FDecl->getParamDecl(i); 2635 2636 OwningExprResult ArgExpr = 2637 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2638 FDecl, Param); 2639 if (ArgExpr.isInvalid()) 2640 return true; 2641 2642 Arg = ArgExpr.takeAs<Expr>(); 2643 } 2644 2645 Call->setArg(i, Arg); 2646 } 2647 2648 // If this is a variadic call, handle args passed through "...". 2649 if (Proto->isVariadic()) { 2650 VariadicCallType CallType = VariadicFunction; 2651 if (Fn->getType()->isBlockPointerType()) 2652 CallType = VariadicBlock; // Block 2653 else if (isa<MemberExpr>(Fn)) 2654 CallType = VariadicMethod; 2655 2656 // Promote the arguments (C99 6.5.2.2p7). 2657 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2658 Expr *Arg = Args[i]; 2659 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2660 Call->setArg(i, Arg); 2661 } 2662 } 2663 2664 return Invalid; 2665} 2666 2667/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2668/// This provides the location of the left/right parens and a list of comma 2669/// locations. 2670Action::OwningExprResult 2671Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2672 MultiExprArg args, 2673 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2674 unsigned NumArgs = args.size(); 2675 2676 // Since this might be a postfix expression, get rid of ParenListExprs. 2677 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2678 2679 Expr *Fn = fn.takeAs<Expr>(); 2680 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2681 assert(Fn && "no function call expression"); 2682 FunctionDecl *FDecl = NULL; 2683 NamedDecl *NDecl = NULL; 2684 DeclarationName UnqualifiedName; 2685 2686 if (getLangOptions().CPlusPlus) { 2687 // Determine whether this is a dependent call inside a C++ template, 2688 // in which case we won't do any semantic analysis now. 2689 // FIXME: Will need to cache the results of name lookup (including ADL) in 2690 // Fn. 2691 bool Dependent = false; 2692 if (Fn->isTypeDependent()) 2693 Dependent = true; 2694 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2695 Dependent = true; 2696 2697 if (Dependent) 2698 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2699 Context.DependentTy, RParenLoc)); 2700 2701 // Determine whether this is a call to an object (C++ [over.call.object]). 2702 if (Fn->getType()->isRecordType()) 2703 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2704 CommaLocs, RParenLoc)); 2705 2706 // Determine whether this is a call to a member function. 2707 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2708 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2709 if (isa<OverloadedFunctionDecl>(MemDecl) || 2710 isa<CXXMethodDecl>(MemDecl) || 2711 (isa<FunctionTemplateDecl>(MemDecl) && 2712 isa<CXXMethodDecl>( 2713 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2714 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2715 CommaLocs, RParenLoc)); 2716 } 2717 } 2718 2719 // If we're directly calling a function, get the appropriate declaration. 2720 // Also, in C++, keep track of whether we should perform argument-dependent 2721 // lookup and whether there were any explicitly-specified template arguments. 2722 Expr *FnExpr = Fn; 2723 bool ADL = true; 2724 bool HasExplicitTemplateArgs = 0; 2725 const TemplateArgument *ExplicitTemplateArgs = 0; 2726 unsigned NumExplicitTemplateArgs = 0; 2727 while (true) { 2728 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2729 FnExpr = IcExpr->getSubExpr(); 2730 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2731 // Parentheses around a function disable ADL 2732 // (C++0x [basic.lookup.argdep]p1). 2733 ADL = false; 2734 FnExpr = PExpr->getSubExpr(); 2735 } else if (isa<UnaryOperator>(FnExpr) && 2736 cast<UnaryOperator>(FnExpr)->getOpcode() 2737 == UnaryOperator::AddrOf) { 2738 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2739 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2740 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2741 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2742 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2743 break; 2744 } else if (UnresolvedFunctionNameExpr *DepName 2745 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2746 UnqualifiedName = DepName->getName(); 2747 break; 2748 } else if (TemplateIdRefExpr *TemplateIdRef 2749 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2750 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2751 if (!NDecl) 2752 NDecl = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2753 HasExplicitTemplateArgs = true; 2754 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2755 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2756 2757 // C++ [temp.arg.explicit]p6: 2758 // [Note: For simple function names, argument dependent lookup (3.4.2) 2759 // applies even when the function name is not visible within the 2760 // scope of the call. This is because the call still has the syntactic 2761 // form of a function call (3.4.1). But when a function template with 2762 // explicit template arguments is used, the call does not have the 2763 // correct syntactic form unless there is a function template with 2764 // that name visible at the point of the call. If no such name is 2765 // visible, the call is not syntactically well-formed and 2766 // argument-dependent lookup does not apply. If some such name is 2767 // visible, argument dependent lookup applies and additional function 2768 // templates may be found in other namespaces. 2769 // 2770 // The summary of this paragraph is that, if we get to this point and the 2771 // template-id was not a qualified name, then argument-dependent lookup 2772 // is still possible. 2773 if (TemplateIdRef->getQualifier()) 2774 ADL = false; 2775 break; 2776 } else { 2777 // Any kind of name that does not refer to a declaration (or 2778 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2779 ADL = false; 2780 break; 2781 } 2782 } 2783 2784 OverloadedFunctionDecl *Ovl = 0; 2785 FunctionTemplateDecl *FunctionTemplate = 0; 2786 if (NDecl) { 2787 FDecl = dyn_cast<FunctionDecl>(NDecl); 2788 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2789 FDecl = FunctionTemplate->getTemplatedDecl(); 2790 else 2791 FDecl = dyn_cast<FunctionDecl>(NDecl); 2792 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2793 } 2794 2795 if (Ovl || FunctionTemplate || 2796 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2797 // We don't perform ADL for implicit declarations of builtins. 2798 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2799 ADL = false; 2800 2801 // We don't perform ADL in C. 2802 if (!getLangOptions().CPlusPlus) 2803 ADL = false; 2804 2805 if (Ovl || FunctionTemplate || ADL) { 2806 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2807 HasExplicitTemplateArgs, 2808 ExplicitTemplateArgs, 2809 NumExplicitTemplateArgs, 2810 LParenLoc, Args, NumArgs, CommaLocs, 2811 RParenLoc, ADL); 2812 if (!FDecl) 2813 return ExprError(); 2814 2815 // Update Fn to refer to the actual function selected. 2816 Expr *NewFn = 0; 2817 if (QualifiedDeclRefExpr *QDRExpr 2818 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2819 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2820 QDRExpr->getLocation(), 2821 false, false, 2822 QDRExpr->getQualifierRange(), 2823 QDRExpr->getQualifier()); 2824 else 2825 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2826 Fn->getSourceRange().getBegin()); 2827 Fn->Destroy(Context); 2828 Fn = NewFn; 2829 } 2830 } 2831 2832 // Promote the function operand. 2833 UsualUnaryConversions(Fn); 2834 2835 // Make the call expr early, before semantic checks. This guarantees cleanup 2836 // of arguments and function on error. 2837 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2838 Args, NumArgs, 2839 Context.BoolTy, 2840 RParenLoc)); 2841 2842 const FunctionType *FuncT; 2843 if (!Fn->getType()->isBlockPointerType()) { 2844 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2845 // have type pointer to function". 2846 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 2847 if (PT == 0) 2848 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2849 << Fn->getType() << Fn->getSourceRange()); 2850 FuncT = PT->getPointeeType()->getAsFunctionType(); 2851 } else { // This is a block call. 2852 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 2853 getAsFunctionType(); 2854 } 2855 if (FuncT == 0) 2856 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2857 << Fn->getType() << Fn->getSourceRange()); 2858 2859 // Check for a valid return type 2860 if (!FuncT->getResultType()->isVoidType() && 2861 RequireCompleteType(Fn->getSourceRange().getBegin(), 2862 FuncT->getResultType(), 2863 PDiag(diag::err_call_incomplete_return) 2864 << TheCall->getSourceRange())) 2865 return ExprError(); 2866 2867 // We know the result type of the call, set it. 2868 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2869 2870 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2871 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2872 RParenLoc)) 2873 return ExprError(); 2874 } else { 2875 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2876 2877 if (FDecl) { 2878 // Check if we have too few/too many template arguments, based 2879 // on our knowledge of the function definition. 2880 const FunctionDecl *Def = 0; 2881 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2882 const FunctionProtoType *Proto = 2883 Def->getType()->getAsFunctionProtoType(); 2884 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2885 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2886 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2887 } 2888 } 2889 } 2890 2891 // Promote the arguments (C99 6.5.2.2p6). 2892 for (unsigned i = 0; i != NumArgs; i++) { 2893 Expr *Arg = Args[i]; 2894 DefaultArgumentPromotion(Arg); 2895 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2896 Arg->getType(), 2897 PDiag(diag::err_call_incomplete_argument) 2898 << Arg->getSourceRange())) 2899 return ExprError(); 2900 TheCall->setArg(i, Arg); 2901 } 2902 } 2903 2904 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2905 if (!Method->isStatic()) 2906 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2907 << Fn->getSourceRange()); 2908 2909 // Check for sentinels 2910 if (NDecl) 2911 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2912 2913 // Do special checking on direct calls to functions. 2914 if (FDecl) { 2915 if (CheckFunctionCall(FDecl, TheCall.get())) 2916 return ExprError(); 2917 2918 if (unsigned BuiltinID = FDecl->getBuiltinID(Context)) 2919 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 2920 } else if (NDecl) { 2921 if (CheckBlockCall(NDecl, TheCall.get())) 2922 return ExprError(); 2923 } 2924 2925 return MaybeBindToTemporary(TheCall.take()); 2926} 2927 2928Action::OwningExprResult 2929Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2930 SourceLocation RParenLoc, ExprArg InitExpr) { 2931 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2932 //FIXME: Preserve type source info. 2933 QualType literalType = GetTypeFromParser(Ty); 2934 // FIXME: put back this assert when initializers are worked out. 2935 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2936 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2937 2938 if (literalType->isArrayType()) { 2939 if (literalType->isVariableArrayType()) 2940 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2941 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2942 } else if (!literalType->isDependentType() && 2943 RequireCompleteType(LParenLoc, literalType, 2944 PDiag(diag::err_typecheck_decl_incomplete_type) 2945 << SourceRange(LParenLoc, 2946 literalExpr->getSourceRange().getEnd()))) 2947 return ExprError(); 2948 2949 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2950 DeclarationName(), /*FIXME:DirectInit=*/false)) 2951 return ExprError(); 2952 2953 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2954 if (isFileScope) { // 6.5.2.5p3 2955 if (CheckForConstantInitializer(literalExpr, literalType)) 2956 return ExprError(); 2957 } 2958 InitExpr.release(); 2959 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2960 literalExpr, isFileScope)); 2961} 2962 2963Action::OwningExprResult 2964Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2965 SourceLocation RBraceLoc) { 2966 unsigned NumInit = initlist.size(); 2967 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2968 2969 // Semantic analysis for initializers is done by ActOnDeclarator() and 2970 // CheckInitializer() - it requires knowledge of the object being intialized. 2971 2972 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2973 RBraceLoc); 2974 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2975 return Owned(E); 2976} 2977 2978/// CheckCastTypes - Check type constraints for casting between types. 2979bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 2980 CastExpr::CastKind& Kind, 2981 CXXMethodDecl *& ConversionDecl, 2982 bool FunctionalStyle) { 2983 if (getLangOptions().CPlusPlus) 2984 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 2985 ConversionDecl); 2986 2987 DefaultFunctionArrayConversion(castExpr); 2988 2989 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2990 // type needs to be scalar. 2991 if (castType->isVoidType()) { 2992 // Cast to void allows any expr type. 2993 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2994 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2995 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2996 (castType->isStructureType() || castType->isUnionType())) { 2997 // GCC struct/union extension: allow cast to self. 2998 // FIXME: Check that the cast destination type is complete. 2999 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3000 << castType << castExpr->getSourceRange(); 3001 Kind = CastExpr::CK_NoOp; 3002 } else if (castType->isUnionType()) { 3003 // GCC cast to union extension 3004 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3005 RecordDecl::field_iterator Field, FieldEnd; 3006 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3007 Field != FieldEnd; ++Field) { 3008 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3009 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3010 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3011 << castExpr->getSourceRange(); 3012 break; 3013 } 3014 } 3015 if (Field == FieldEnd) 3016 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3017 << castExpr->getType() << castExpr->getSourceRange(); 3018 Kind = CastExpr::CK_ToUnion; 3019 } else { 3020 // Reject any other conversions to non-scalar types. 3021 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3022 << castType << castExpr->getSourceRange(); 3023 } 3024 } else if (!castExpr->getType()->isScalarType() && 3025 !castExpr->getType()->isVectorType()) { 3026 return Diag(castExpr->getLocStart(), 3027 diag::err_typecheck_expect_scalar_operand) 3028 << castExpr->getType() << castExpr->getSourceRange(); 3029 } else if (castType->isExtVectorType()) { 3030 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 3031 return true; 3032 } else if (castType->isVectorType()) { 3033 if (CheckVectorCast(TyR, castType, castExpr->getType())) 3034 return true; 3035 } else if (castExpr->getType()->isVectorType()) { 3036 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 3037 return true; 3038 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 3039 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3040 } else if (!castType->isArithmeticType()) { 3041 QualType castExprType = castExpr->getType(); 3042 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3043 return Diag(castExpr->getLocStart(), 3044 diag::err_cast_pointer_from_non_pointer_int) 3045 << castExprType << castExpr->getSourceRange(); 3046 } else if (!castExpr->getType()->isArithmeticType()) { 3047 if (!castType->isIntegralType() && castType->isArithmeticType()) 3048 return Diag(castExpr->getLocStart(), 3049 diag::err_cast_pointer_to_non_pointer_int) 3050 << castType << castExpr->getSourceRange(); 3051 } 3052 if (isa<ObjCSelectorExpr>(castExpr)) 3053 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3054 return false; 3055} 3056 3057bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 3058 assert(VectorTy->isVectorType() && "Not a vector type!"); 3059 3060 if (Ty->isVectorType() || Ty->isIntegerType()) { 3061 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3062 return Diag(R.getBegin(), 3063 Ty->isVectorType() ? 3064 diag::err_invalid_conversion_between_vectors : 3065 diag::err_invalid_conversion_between_vector_and_integer) 3066 << VectorTy << Ty << R; 3067 } else 3068 return Diag(R.getBegin(), 3069 diag::err_invalid_conversion_between_vector_and_scalar) 3070 << VectorTy << Ty << R; 3071 3072 return false; 3073} 3074 3075bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3076 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3077 3078 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3079 // an ExtVectorType. 3080 if (SrcTy->isVectorType()) { 3081 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3082 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3083 << DestTy << SrcTy << R; 3084 return false; 3085 } 3086 3087 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3088 // conversion will take place first from scalar to elt type, and then 3089 // splat from elt type to vector. 3090 if (SrcTy->isPointerType()) 3091 return Diag(R.getBegin(), 3092 diag::err_invalid_conversion_between_vector_and_scalar) 3093 << DestTy << SrcTy << R; 3094 return false; 3095} 3096 3097Action::OwningExprResult 3098Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3099 SourceLocation RParenLoc, ExprArg Op) { 3100 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3101 3102 assert((Ty != 0) && (Op.get() != 0) && 3103 "ActOnCastExpr(): missing type or expr"); 3104 3105 Expr *castExpr = (Expr *)Op.get(); 3106 //FIXME: Preserve type source info. 3107 QualType castType = GetTypeFromParser(Ty); 3108 3109 // If the Expr being casted is a ParenListExpr, handle it specially. 3110 if (isa<ParenListExpr>(castExpr)) 3111 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3112 CXXMethodDecl *ConversionDecl = 0; 3113 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3114 Kind, ConversionDecl)) 3115 return ExprError(); 3116 if (ConversionDecl) { 3117 // encounterred a c-style cast requiring a conversion function. 3118 if (CXXConversionDecl *CD = dyn_cast<CXXConversionDecl>(ConversionDecl)) { 3119 castExpr = 3120 new (Context) CXXFunctionalCastExpr(castType.getNonReferenceType(), 3121 castType, LParenLoc, 3122 CastExpr::CK_UserDefinedConversion, 3123 castExpr, CD, 3124 RParenLoc); 3125 Kind = CastExpr::CK_UserDefinedConversion; 3126 } 3127 // FIXME. AST for when dealing with conversion functions (FunctionDecl). 3128 } 3129 3130 Op.release(); 3131 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3132 Kind, castExpr, castType, 3133 LParenLoc, RParenLoc)); 3134} 3135 3136/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3137/// of comma binary operators. 3138Action::OwningExprResult 3139Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3140 Expr *expr = EA.takeAs<Expr>(); 3141 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3142 if (!E) 3143 return Owned(expr); 3144 3145 OwningExprResult Result(*this, E->getExpr(0)); 3146 3147 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3148 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3149 Owned(E->getExpr(i))); 3150 3151 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3152} 3153 3154Action::OwningExprResult 3155Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3156 SourceLocation RParenLoc, ExprArg Op, 3157 QualType Ty) { 3158 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3159 3160 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3161 // then handle it as such. 3162 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3163 if (PE->getNumExprs() == 0) { 3164 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3165 return ExprError(); 3166 } 3167 3168 llvm::SmallVector<Expr *, 8> initExprs; 3169 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3170 initExprs.push_back(PE->getExpr(i)); 3171 3172 // FIXME: This means that pretty-printing the final AST will produce curly 3173 // braces instead of the original commas. 3174 Op.release(); 3175 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3176 initExprs.size(), RParenLoc); 3177 E->setType(Ty); 3178 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3179 Owned(E)); 3180 } else { 3181 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3182 // sequence of BinOp comma operators. 3183 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3184 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3185 } 3186} 3187 3188Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3189 SourceLocation R, 3190 MultiExprArg Val) { 3191 unsigned nexprs = Val.size(); 3192 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3193 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3194 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3195 return Owned(expr); 3196} 3197 3198/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3199/// In that case, lhs = cond. 3200/// C99 6.5.15 3201QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3202 SourceLocation QuestionLoc) { 3203 // C++ is sufficiently different to merit its own checker. 3204 if (getLangOptions().CPlusPlus) 3205 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3206 3207 UsualUnaryConversions(Cond); 3208 UsualUnaryConversions(LHS); 3209 UsualUnaryConversions(RHS); 3210 QualType CondTy = Cond->getType(); 3211 QualType LHSTy = LHS->getType(); 3212 QualType RHSTy = RHS->getType(); 3213 3214 // first, check the condition. 3215 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3216 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3217 << CondTy; 3218 return QualType(); 3219 } 3220 3221 // Now check the two expressions. 3222 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3223 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3224 3225 // If both operands have arithmetic type, do the usual arithmetic conversions 3226 // to find a common type: C99 6.5.15p3,5. 3227 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3228 UsualArithmeticConversions(LHS, RHS); 3229 return LHS->getType(); 3230 } 3231 3232 // If both operands are the same structure or union type, the result is that 3233 // type. 3234 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3235 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3236 if (LHSRT->getDecl() == RHSRT->getDecl()) 3237 // "If both the operands have structure or union type, the result has 3238 // that type." This implies that CV qualifiers are dropped. 3239 return LHSTy.getUnqualifiedType(); 3240 // FIXME: Type of conditional expression must be complete in C mode. 3241 } 3242 3243 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3244 // The following || allows only one side to be void (a GCC-ism). 3245 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3246 if (!LHSTy->isVoidType()) 3247 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3248 << RHS->getSourceRange(); 3249 if (!RHSTy->isVoidType()) 3250 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3251 << LHS->getSourceRange(); 3252 ImpCastExprToType(LHS, Context.VoidTy); 3253 ImpCastExprToType(RHS, Context.VoidTy); 3254 return Context.VoidTy; 3255 } 3256 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3257 // the type of the other operand." 3258 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3259 RHS->isNullPointerConstant(Context)) { 3260 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3261 return LHSTy; 3262 } 3263 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3264 LHS->isNullPointerConstant(Context)) { 3265 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3266 return RHSTy; 3267 } 3268 // Handle things like Class and struct objc_class*. Here we case the result 3269 // to the pseudo-builtin, because that will be implicitly cast back to the 3270 // redefinition type if an attempt is made to access its fields. 3271 if (LHSTy->isObjCClassType() && 3272 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3273 ImpCastExprToType(RHS, LHSTy); 3274 return LHSTy; 3275 } 3276 if (RHSTy->isObjCClassType() && 3277 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3278 ImpCastExprToType(LHS, RHSTy); 3279 return RHSTy; 3280 } 3281 // And the same for struct objc_object* / id 3282 if (LHSTy->isObjCIdType() && 3283 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3284 ImpCastExprToType(RHS, LHSTy); 3285 return LHSTy; 3286 } 3287 if (RHSTy->isObjCIdType() && 3288 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3289 ImpCastExprToType(LHS, RHSTy); 3290 return RHSTy; 3291 } 3292 // Handle block pointer types. 3293 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3294 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3295 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3296 QualType destType = Context.getPointerType(Context.VoidTy); 3297 ImpCastExprToType(LHS, destType); 3298 ImpCastExprToType(RHS, destType); 3299 return destType; 3300 } 3301 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3302 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3303 return QualType(); 3304 } 3305 // We have 2 block pointer types. 3306 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3307 // Two identical block pointer types are always compatible. 3308 return LHSTy; 3309 } 3310 // The block pointer types aren't identical, continue checking. 3311 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3312 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3313 3314 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3315 rhptee.getUnqualifiedType())) { 3316 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3317 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3318 // In this situation, we assume void* type. No especially good 3319 // reason, but this is what gcc does, and we do have to pick 3320 // to get a consistent AST. 3321 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3322 ImpCastExprToType(LHS, incompatTy); 3323 ImpCastExprToType(RHS, incompatTy); 3324 return incompatTy; 3325 } 3326 // The block pointer types are compatible. 3327 ImpCastExprToType(LHS, LHSTy); 3328 ImpCastExprToType(RHS, LHSTy); 3329 return LHSTy; 3330 } 3331 // Check constraints for Objective-C object pointers types. 3332 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3333 3334 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3335 // Two identical object pointer types are always compatible. 3336 return LHSTy; 3337 } 3338 const ObjCObjectPointerType *LHSOPT = LHSTy->getAsObjCObjectPointerType(); 3339 const ObjCObjectPointerType *RHSOPT = RHSTy->getAsObjCObjectPointerType(); 3340 QualType compositeType = LHSTy; 3341 3342 // If both operands are interfaces and either operand can be 3343 // assigned to the other, use that type as the composite 3344 // type. This allows 3345 // xxx ? (A*) a : (B*) b 3346 // where B is a subclass of A. 3347 // 3348 // Additionally, as for assignment, if either type is 'id' 3349 // allow silent coercion. Finally, if the types are 3350 // incompatible then make sure to use 'id' as the composite 3351 // type so the result is acceptable for sending messages to. 3352 3353 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3354 // It could return the composite type. 3355 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3356 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3357 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3358 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3359 } else if ((LHSTy->isObjCQualifiedIdType() || 3360 RHSTy->isObjCQualifiedIdType()) && 3361 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3362 // Need to handle "id<xx>" explicitly. 3363 // GCC allows qualified id and any Objective-C type to devolve to 3364 // id. Currently localizing to here until clear this should be 3365 // part of ObjCQualifiedIdTypesAreCompatible. 3366 compositeType = Context.getObjCIdType(); 3367 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3368 compositeType = Context.getObjCIdType(); 3369 } else { 3370 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3371 << LHSTy << RHSTy 3372 << LHS->getSourceRange() << RHS->getSourceRange(); 3373 QualType incompatTy = Context.getObjCIdType(); 3374 ImpCastExprToType(LHS, incompatTy); 3375 ImpCastExprToType(RHS, incompatTy); 3376 return incompatTy; 3377 } 3378 // The object pointer types are compatible. 3379 ImpCastExprToType(LHS, compositeType); 3380 ImpCastExprToType(RHS, compositeType); 3381 return compositeType; 3382 } 3383 // Check Objective-C object pointer types and 'void *' 3384 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3385 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3386 QualType rhptee = RHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3387 QualType destPointee = lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3388 QualType destType = Context.getPointerType(destPointee); 3389 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3390 ImpCastExprToType(RHS, destType); // promote to void* 3391 return destType; 3392 } 3393 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3394 QualType lhptee = LHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3395 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3396 QualType destPointee = rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3397 QualType destType = Context.getPointerType(destPointee); 3398 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3399 ImpCastExprToType(LHS, destType); // promote to void* 3400 return destType; 3401 } 3402 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3403 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3404 // get the "pointed to" types 3405 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3406 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3407 3408 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3409 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3410 // Figure out necessary qualifiers (C99 6.5.15p6) 3411 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3412 QualType destType = Context.getPointerType(destPointee); 3413 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3414 ImpCastExprToType(RHS, destType); // promote to void* 3415 return destType; 3416 } 3417 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3418 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3419 QualType destType = Context.getPointerType(destPointee); 3420 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3421 ImpCastExprToType(RHS, destType); // promote to void* 3422 return destType; 3423 } 3424 3425 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3426 // Two identical pointer types are always compatible. 3427 return LHSTy; 3428 } 3429 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3430 rhptee.getUnqualifiedType())) { 3431 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3432 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3433 // In this situation, we assume void* type. No especially good 3434 // reason, but this is what gcc does, and we do have to pick 3435 // to get a consistent AST. 3436 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3437 ImpCastExprToType(LHS, incompatTy); 3438 ImpCastExprToType(RHS, incompatTy); 3439 return incompatTy; 3440 } 3441 // The pointer types are compatible. 3442 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3443 // differently qualified versions of compatible types, the result type is 3444 // a pointer to an appropriately qualified version of the *composite* 3445 // type. 3446 // FIXME: Need to calculate the composite type. 3447 // FIXME: Need to add qualifiers 3448 ImpCastExprToType(LHS, LHSTy); 3449 ImpCastExprToType(RHS, LHSTy); 3450 return LHSTy; 3451 } 3452 3453 // GCC compatibility: soften pointer/integer mismatch. 3454 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3455 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3456 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3457 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3458 return RHSTy; 3459 } 3460 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3461 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3462 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3463 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3464 return LHSTy; 3465 } 3466 3467 // Otherwise, the operands are not compatible. 3468 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3469 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3470 return QualType(); 3471} 3472 3473/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3474/// in the case of a the GNU conditional expr extension. 3475Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3476 SourceLocation ColonLoc, 3477 ExprArg Cond, ExprArg LHS, 3478 ExprArg RHS) { 3479 Expr *CondExpr = (Expr *) Cond.get(); 3480 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3481 3482 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3483 // was the condition. 3484 bool isLHSNull = LHSExpr == 0; 3485 if (isLHSNull) 3486 LHSExpr = CondExpr; 3487 3488 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3489 RHSExpr, QuestionLoc); 3490 if (result.isNull()) 3491 return ExprError(); 3492 3493 Cond.release(); 3494 LHS.release(); 3495 RHS.release(); 3496 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3497 isLHSNull ? 0 : LHSExpr, 3498 ColonLoc, RHSExpr, result)); 3499} 3500 3501// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3502// being closely modeled after the C99 spec:-). The odd characteristic of this 3503// routine is it effectively iqnores the qualifiers on the top level pointee. 3504// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3505// FIXME: add a couple examples in this comment. 3506Sema::AssignConvertType 3507Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3508 QualType lhptee, rhptee; 3509 3510 if ((lhsType->isObjCClassType() && 3511 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3512 (rhsType->isObjCClassType() && 3513 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3514 return Compatible; 3515 } 3516 3517 // get the "pointed to" type (ignoring qualifiers at the top level) 3518 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3519 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3520 3521 // make sure we operate on the canonical type 3522 lhptee = Context.getCanonicalType(lhptee); 3523 rhptee = Context.getCanonicalType(rhptee); 3524 3525 AssignConvertType ConvTy = Compatible; 3526 3527 // C99 6.5.16.1p1: This following citation is common to constraints 3528 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3529 // qualifiers of the type *pointed to* by the right; 3530 // FIXME: Handle ExtQualType 3531 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3532 ConvTy = CompatiblePointerDiscardsQualifiers; 3533 3534 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3535 // incomplete type and the other is a pointer to a qualified or unqualified 3536 // version of void... 3537 if (lhptee->isVoidType()) { 3538 if (rhptee->isIncompleteOrObjectType()) 3539 return ConvTy; 3540 3541 // As an extension, we allow cast to/from void* to function pointer. 3542 assert(rhptee->isFunctionType()); 3543 return FunctionVoidPointer; 3544 } 3545 3546 if (rhptee->isVoidType()) { 3547 if (lhptee->isIncompleteOrObjectType()) 3548 return ConvTy; 3549 3550 // As an extension, we allow cast to/from void* to function pointer. 3551 assert(lhptee->isFunctionType()); 3552 return FunctionVoidPointer; 3553 } 3554 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3555 // unqualified versions of compatible types, ... 3556 lhptee = lhptee.getUnqualifiedType(); 3557 rhptee = rhptee.getUnqualifiedType(); 3558 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3559 // Check if the pointee types are compatible ignoring the sign. 3560 // We explicitly check for char so that we catch "char" vs 3561 // "unsigned char" on systems where "char" is unsigned. 3562 if (lhptee->isCharType()) { 3563 lhptee = Context.UnsignedCharTy; 3564 } else if (lhptee->isSignedIntegerType()) { 3565 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3566 } 3567 if (rhptee->isCharType()) { 3568 rhptee = Context.UnsignedCharTy; 3569 } else if (rhptee->isSignedIntegerType()) { 3570 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3571 } 3572 if (lhptee == rhptee) { 3573 // Types are compatible ignoring the sign. Qualifier incompatibility 3574 // takes priority over sign incompatibility because the sign 3575 // warning can be disabled. 3576 if (ConvTy != Compatible) 3577 return ConvTy; 3578 return IncompatiblePointerSign; 3579 } 3580 // General pointer incompatibility takes priority over qualifiers. 3581 return IncompatiblePointer; 3582 } 3583 return ConvTy; 3584} 3585 3586/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3587/// block pointer types are compatible or whether a block and normal pointer 3588/// are compatible. It is more restrict than comparing two function pointer 3589// types. 3590Sema::AssignConvertType 3591Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3592 QualType rhsType) { 3593 QualType lhptee, rhptee; 3594 3595 // get the "pointed to" type (ignoring qualifiers at the top level) 3596 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3597 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3598 3599 // make sure we operate on the canonical type 3600 lhptee = Context.getCanonicalType(lhptee); 3601 rhptee = Context.getCanonicalType(rhptee); 3602 3603 AssignConvertType ConvTy = Compatible; 3604 3605 // For blocks we enforce that qualifiers are identical. 3606 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3607 ConvTy = CompatiblePointerDiscardsQualifiers; 3608 3609 if (!Context.typesAreCompatible(lhptee, rhptee)) 3610 return IncompatibleBlockPointer; 3611 return ConvTy; 3612} 3613 3614/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3615/// has code to accommodate several GCC extensions when type checking 3616/// pointers. Here are some objectionable examples that GCC considers warnings: 3617/// 3618/// int a, *pint; 3619/// short *pshort; 3620/// struct foo *pfoo; 3621/// 3622/// pint = pshort; // warning: assignment from incompatible pointer type 3623/// a = pint; // warning: assignment makes integer from pointer without a cast 3624/// pint = a; // warning: assignment makes pointer from integer without a cast 3625/// pint = pfoo; // warning: assignment from incompatible pointer type 3626/// 3627/// As a result, the code for dealing with pointers is more complex than the 3628/// C99 spec dictates. 3629/// 3630Sema::AssignConvertType 3631Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3632 // Get canonical types. We're not formatting these types, just comparing 3633 // them. 3634 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3635 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3636 3637 if (lhsType == rhsType) 3638 return Compatible; // Common case: fast path an exact match. 3639 3640 if ((lhsType->isObjCClassType() && 3641 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3642 (rhsType->isObjCClassType() && 3643 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3644 return Compatible; 3645 } 3646 3647 // If the left-hand side is a reference type, then we are in a 3648 // (rare!) case where we've allowed the use of references in C, 3649 // e.g., as a parameter type in a built-in function. In this case, 3650 // just make sure that the type referenced is compatible with the 3651 // right-hand side type. The caller is responsible for adjusting 3652 // lhsType so that the resulting expression does not have reference 3653 // type. 3654 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3655 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3656 return Compatible; 3657 return Incompatible; 3658 } 3659 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3660 // to the same ExtVector type. 3661 if (lhsType->isExtVectorType()) { 3662 if (rhsType->isExtVectorType()) 3663 return lhsType == rhsType ? Compatible : Incompatible; 3664 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3665 return Compatible; 3666 } 3667 3668 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3669 // If we are allowing lax vector conversions, and LHS and RHS are both 3670 // vectors, the total size only needs to be the same. This is a bitcast; 3671 // no bits are changed but the result type is different. 3672 if (getLangOptions().LaxVectorConversions && 3673 lhsType->isVectorType() && rhsType->isVectorType()) { 3674 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3675 return IncompatibleVectors; 3676 } 3677 return Incompatible; 3678 } 3679 3680 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3681 return Compatible; 3682 3683 if (isa<PointerType>(lhsType)) { 3684 if (rhsType->isIntegerType()) 3685 return IntToPointer; 3686 3687 if (isa<PointerType>(rhsType)) 3688 return CheckPointerTypesForAssignment(lhsType, rhsType); 3689 3690 // In general, C pointers are not compatible with ObjC object pointers. 3691 if (isa<ObjCObjectPointerType>(rhsType)) { 3692 if (lhsType->isVoidPointerType()) // an exception to the rule. 3693 return Compatible; 3694 return IncompatiblePointer; 3695 } 3696 if (rhsType->getAs<BlockPointerType>()) { 3697 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3698 return Compatible; 3699 3700 // Treat block pointers as objects. 3701 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3702 return Compatible; 3703 } 3704 return Incompatible; 3705 } 3706 3707 if (isa<BlockPointerType>(lhsType)) { 3708 if (rhsType->isIntegerType()) 3709 return IntToBlockPointer; 3710 3711 // Treat block pointers as objects. 3712 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3713 return Compatible; 3714 3715 if (rhsType->isBlockPointerType()) 3716 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3717 3718 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3719 if (RHSPT->getPointeeType()->isVoidType()) 3720 return Compatible; 3721 } 3722 return Incompatible; 3723 } 3724 3725 if (isa<ObjCObjectPointerType>(lhsType)) { 3726 if (rhsType->isIntegerType()) 3727 return IntToPointer; 3728 3729 // In general, C pointers are not compatible with ObjC object pointers. 3730 if (isa<PointerType>(rhsType)) { 3731 if (rhsType->isVoidPointerType()) // an exception to the rule. 3732 return Compatible; 3733 return IncompatiblePointer; 3734 } 3735 if (rhsType->isObjCObjectPointerType()) { 3736 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3737 return Compatible; 3738 if (Context.typesAreCompatible(lhsType, rhsType)) 3739 return Compatible; 3740 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3741 return IncompatibleObjCQualifiedId; 3742 return IncompatiblePointer; 3743 } 3744 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3745 if (RHSPT->getPointeeType()->isVoidType()) 3746 return Compatible; 3747 } 3748 // Treat block pointers as objects. 3749 if (rhsType->isBlockPointerType()) 3750 return Compatible; 3751 return Incompatible; 3752 } 3753 if (isa<PointerType>(rhsType)) { 3754 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3755 if (lhsType == Context.BoolTy) 3756 return Compatible; 3757 3758 if (lhsType->isIntegerType()) 3759 return PointerToInt; 3760 3761 if (isa<PointerType>(lhsType)) 3762 return CheckPointerTypesForAssignment(lhsType, rhsType); 3763 3764 if (isa<BlockPointerType>(lhsType) && 3765 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3766 return Compatible; 3767 return Incompatible; 3768 } 3769 if (isa<ObjCObjectPointerType>(rhsType)) { 3770 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3771 if (lhsType == Context.BoolTy) 3772 return Compatible; 3773 3774 if (lhsType->isIntegerType()) 3775 return PointerToInt; 3776 3777 // In general, C pointers are not compatible with ObjC object pointers. 3778 if (isa<PointerType>(lhsType)) { 3779 if (lhsType->isVoidPointerType()) // an exception to the rule. 3780 return Compatible; 3781 return IncompatiblePointer; 3782 } 3783 if (isa<BlockPointerType>(lhsType) && 3784 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3785 return Compatible; 3786 return Incompatible; 3787 } 3788 3789 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3790 if (Context.typesAreCompatible(lhsType, rhsType)) 3791 return Compatible; 3792 } 3793 return Incompatible; 3794} 3795 3796/// \brief Constructs a transparent union from an expression that is 3797/// used to initialize the transparent union. 3798static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3799 QualType UnionType, FieldDecl *Field) { 3800 // Build an initializer list that designates the appropriate member 3801 // of the transparent union. 3802 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3803 &E, 1, 3804 SourceLocation()); 3805 Initializer->setType(UnionType); 3806 Initializer->setInitializedFieldInUnion(Field); 3807 3808 // Build a compound literal constructing a value of the transparent 3809 // union type from this initializer list. 3810 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3811 false); 3812} 3813 3814Sema::AssignConvertType 3815Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3816 QualType FromType = rExpr->getType(); 3817 3818 // If the ArgType is a Union type, we want to handle a potential 3819 // transparent_union GCC extension. 3820 const RecordType *UT = ArgType->getAsUnionType(); 3821 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3822 return Incompatible; 3823 3824 // The field to initialize within the transparent union. 3825 RecordDecl *UD = UT->getDecl(); 3826 FieldDecl *InitField = 0; 3827 // It's compatible if the expression matches any of the fields. 3828 for (RecordDecl::field_iterator it = UD->field_begin(), 3829 itend = UD->field_end(); 3830 it != itend; ++it) { 3831 if (it->getType()->isPointerType()) { 3832 // If the transparent union contains a pointer type, we allow: 3833 // 1) void pointer 3834 // 2) null pointer constant 3835 if (FromType->isPointerType()) 3836 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 3837 ImpCastExprToType(rExpr, it->getType()); 3838 InitField = *it; 3839 break; 3840 } 3841 3842 if (rExpr->isNullPointerConstant(Context)) { 3843 ImpCastExprToType(rExpr, it->getType()); 3844 InitField = *it; 3845 break; 3846 } 3847 } 3848 3849 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3850 == Compatible) { 3851 InitField = *it; 3852 break; 3853 } 3854 } 3855 3856 if (!InitField) 3857 return Incompatible; 3858 3859 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3860 return Compatible; 3861} 3862 3863Sema::AssignConvertType 3864Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3865 if (getLangOptions().CPlusPlus) { 3866 if (!lhsType->isRecordType()) { 3867 // C++ 5.17p3: If the left operand is not of class type, the 3868 // expression is implicitly converted (C++ 4) to the 3869 // cv-unqualified type of the left operand. 3870 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3871 "assigning")) 3872 return Incompatible; 3873 return Compatible; 3874 } 3875 3876 // FIXME: Currently, we fall through and treat C++ classes like C 3877 // structures. 3878 } 3879 3880 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3881 // a null pointer constant. 3882 if ((lhsType->isPointerType() || 3883 lhsType->isObjCObjectPointerType() || 3884 lhsType->isBlockPointerType()) 3885 && rExpr->isNullPointerConstant(Context)) { 3886 ImpCastExprToType(rExpr, lhsType); 3887 return Compatible; 3888 } 3889 3890 // This check seems unnatural, however it is necessary to ensure the proper 3891 // conversion of functions/arrays. If the conversion were done for all 3892 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3893 // expressions that surpress this implicit conversion (&, sizeof). 3894 // 3895 // Suppress this for references: C++ 8.5.3p5. 3896 if (!lhsType->isReferenceType()) 3897 DefaultFunctionArrayConversion(rExpr); 3898 3899 Sema::AssignConvertType result = 3900 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3901 3902 // C99 6.5.16.1p2: The value of the right operand is converted to the 3903 // type of the assignment expression. 3904 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3905 // so that we can use references in built-in functions even in C. 3906 // The getNonReferenceType() call makes sure that the resulting expression 3907 // does not have reference type. 3908 if (result != Incompatible && rExpr->getType() != lhsType) 3909 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3910 return result; 3911} 3912 3913QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3914 Diag(Loc, diag::err_typecheck_invalid_operands) 3915 << lex->getType() << rex->getType() 3916 << lex->getSourceRange() << rex->getSourceRange(); 3917 return QualType(); 3918} 3919 3920inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3921 Expr *&rex) { 3922 // For conversion purposes, we ignore any qualifiers. 3923 // For example, "const float" and "float" are equivalent. 3924 QualType lhsType = 3925 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3926 QualType rhsType = 3927 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3928 3929 // If the vector types are identical, return. 3930 if (lhsType == rhsType) 3931 return lhsType; 3932 3933 // Handle the case of a vector & extvector type of the same size and element 3934 // type. It would be nice if we only had one vector type someday. 3935 if (getLangOptions().LaxVectorConversions) { 3936 // FIXME: Should we warn here? 3937 if (const VectorType *LV = lhsType->getAsVectorType()) { 3938 if (const VectorType *RV = rhsType->getAsVectorType()) 3939 if (LV->getElementType() == RV->getElementType() && 3940 LV->getNumElements() == RV->getNumElements()) { 3941 return lhsType->isExtVectorType() ? lhsType : rhsType; 3942 } 3943 } 3944 } 3945 3946 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 3947 // swap back (so that we don't reverse the inputs to a subtract, for instance. 3948 bool swapped = false; 3949 if (rhsType->isExtVectorType()) { 3950 swapped = true; 3951 std::swap(rex, lex); 3952 std::swap(rhsType, lhsType); 3953 } 3954 3955 // Handle the case of an ext vector and scalar. 3956 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 3957 QualType EltTy = LV->getElementType(); 3958 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 3959 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 3960 ImpCastExprToType(rex, lhsType); 3961 if (swapped) std::swap(rex, lex); 3962 return lhsType; 3963 } 3964 } 3965 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 3966 rhsType->isRealFloatingType()) { 3967 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 3968 ImpCastExprToType(rex, lhsType); 3969 if (swapped) std::swap(rex, lex); 3970 return lhsType; 3971 } 3972 } 3973 } 3974 3975 // Vectors of different size or scalar and non-ext-vector are errors. 3976 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3977 << lex->getType() << rex->getType() 3978 << lex->getSourceRange() << rex->getSourceRange(); 3979 return QualType(); 3980} 3981 3982inline QualType Sema::CheckMultiplyDivideOperands( 3983 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3984{ 3985 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3986 return CheckVectorOperands(Loc, lex, rex); 3987 3988 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3989 3990 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3991 return compType; 3992 return InvalidOperands(Loc, lex, rex); 3993} 3994 3995inline QualType Sema::CheckRemainderOperands( 3996 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3997{ 3998 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3999 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4000 return CheckVectorOperands(Loc, lex, rex); 4001 return InvalidOperands(Loc, lex, rex); 4002 } 4003 4004 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4005 4006 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4007 return compType; 4008 return InvalidOperands(Loc, lex, rex); 4009} 4010 4011inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4012 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 4013{ 4014 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4015 QualType compType = CheckVectorOperands(Loc, lex, rex); 4016 if (CompLHSTy) *CompLHSTy = compType; 4017 return compType; 4018 } 4019 4020 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4021 4022 // handle the common case first (both operands are arithmetic). 4023 if (lex->getType()->isArithmeticType() && 4024 rex->getType()->isArithmeticType()) { 4025 if (CompLHSTy) *CompLHSTy = compType; 4026 return compType; 4027 } 4028 4029 // Put any potential pointer into PExp 4030 Expr* PExp = lex, *IExp = rex; 4031 if (IExp->getType()->isAnyPointerType()) 4032 std::swap(PExp, IExp); 4033 4034 if (PExp->getType()->isAnyPointerType()) { 4035 4036 if (IExp->getType()->isIntegerType()) { 4037 QualType PointeeTy = PExp->getType()->getPointeeType(); 4038 4039 // Check for arithmetic on pointers to incomplete types. 4040 if (PointeeTy->isVoidType()) { 4041 if (getLangOptions().CPlusPlus) { 4042 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4043 << lex->getSourceRange() << rex->getSourceRange(); 4044 return QualType(); 4045 } 4046 4047 // GNU extension: arithmetic on pointer to void 4048 Diag(Loc, diag::ext_gnu_void_ptr) 4049 << lex->getSourceRange() << rex->getSourceRange(); 4050 } else if (PointeeTy->isFunctionType()) { 4051 if (getLangOptions().CPlusPlus) { 4052 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4053 << lex->getType() << lex->getSourceRange(); 4054 return QualType(); 4055 } 4056 4057 // GNU extension: arithmetic on pointer to function 4058 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4059 << lex->getType() << lex->getSourceRange(); 4060 } else { 4061 // Check if we require a complete type. 4062 if (((PExp->getType()->isPointerType() && 4063 !PExp->getType()->isDependentType()) || 4064 PExp->getType()->isObjCObjectPointerType()) && 4065 RequireCompleteType(Loc, PointeeTy, 4066 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4067 << PExp->getSourceRange() 4068 << PExp->getType())) 4069 return QualType(); 4070 } 4071 // Diagnose bad cases where we step over interface counts. 4072 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4073 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4074 << PointeeTy << PExp->getSourceRange(); 4075 return QualType(); 4076 } 4077 4078 if (CompLHSTy) { 4079 QualType LHSTy = Context.isPromotableBitField(lex); 4080 if (LHSTy.isNull()) { 4081 LHSTy = lex->getType(); 4082 if (LHSTy->isPromotableIntegerType()) 4083 LHSTy = Context.getPromotedIntegerType(LHSTy); 4084 } 4085 *CompLHSTy = LHSTy; 4086 } 4087 return PExp->getType(); 4088 } 4089 } 4090 4091 return InvalidOperands(Loc, lex, rex); 4092} 4093 4094// C99 6.5.6 4095QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4096 SourceLocation Loc, QualType* CompLHSTy) { 4097 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4098 QualType compType = CheckVectorOperands(Loc, lex, rex); 4099 if (CompLHSTy) *CompLHSTy = compType; 4100 return compType; 4101 } 4102 4103 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4104 4105 // Enforce type constraints: C99 6.5.6p3. 4106 4107 // Handle the common case first (both operands are arithmetic). 4108 if (lex->getType()->isArithmeticType() 4109 && rex->getType()->isArithmeticType()) { 4110 if (CompLHSTy) *CompLHSTy = compType; 4111 return compType; 4112 } 4113 4114 // Either ptr - int or ptr - ptr. 4115 if (lex->getType()->isAnyPointerType()) { 4116 QualType lpointee = lex->getType()->getPointeeType(); 4117 4118 // The LHS must be an completely-defined object type. 4119 4120 bool ComplainAboutVoid = false; 4121 Expr *ComplainAboutFunc = 0; 4122 if (lpointee->isVoidType()) { 4123 if (getLangOptions().CPlusPlus) { 4124 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4125 << lex->getSourceRange() << rex->getSourceRange(); 4126 return QualType(); 4127 } 4128 4129 // GNU C extension: arithmetic on pointer to void 4130 ComplainAboutVoid = true; 4131 } else if (lpointee->isFunctionType()) { 4132 if (getLangOptions().CPlusPlus) { 4133 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4134 << lex->getType() << lex->getSourceRange(); 4135 return QualType(); 4136 } 4137 4138 // GNU C extension: arithmetic on pointer to function 4139 ComplainAboutFunc = lex; 4140 } else if (!lpointee->isDependentType() && 4141 RequireCompleteType(Loc, lpointee, 4142 PDiag(diag::err_typecheck_sub_ptr_object) 4143 << lex->getSourceRange() 4144 << lex->getType())) 4145 return QualType(); 4146 4147 // Diagnose bad cases where we step over interface counts. 4148 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4149 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4150 << lpointee << lex->getSourceRange(); 4151 return QualType(); 4152 } 4153 4154 // The result type of a pointer-int computation is the pointer type. 4155 if (rex->getType()->isIntegerType()) { 4156 if (ComplainAboutVoid) 4157 Diag(Loc, diag::ext_gnu_void_ptr) 4158 << lex->getSourceRange() << rex->getSourceRange(); 4159 if (ComplainAboutFunc) 4160 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4161 << ComplainAboutFunc->getType() 4162 << ComplainAboutFunc->getSourceRange(); 4163 4164 if (CompLHSTy) *CompLHSTy = lex->getType(); 4165 return lex->getType(); 4166 } 4167 4168 // Handle pointer-pointer subtractions. 4169 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4170 QualType rpointee = RHSPTy->getPointeeType(); 4171 4172 // RHS must be a completely-type object type. 4173 // Handle the GNU void* extension. 4174 if (rpointee->isVoidType()) { 4175 if (getLangOptions().CPlusPlus) { 4176 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4177 << lex->getSourceRange() << rex->getSourceRange(); 4178 return QualType(); 4179 } 4180 4181 ComplainAboutVoid = true; 4182 } else if (rpointee->isFunctionType()) { 4183 if (getLangOptions().CPlusPlus) { 4184 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4185 << rex->getType() << rex->getSourceRange(); 4186 return QualType(); 4187 } 4188 4189 // GNU extension: arithmetic on pointer to function 4190 if (!ComplainAboutFunc) 4191 ComplainAboutFunc = rex; 4192 } else if (!rpointee->isDependentType() && 4193 RequireCompleteType(Loc, rpointee, 4194 PDiag(diag::err_typecheck_sub_ptr_object) 4195 << rex->getSourceRange() 4196 << rex->getType())) 4197 return QualType(); 4198 4199 if (getLangOptions().CPlusPlus) { 4200 // Pointee types must be the same: C++ [expr.add] 4201 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4202 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4203 << lex->getType() << rex->getType() 4204 << lex->getSourceRange() << rex->getSourceRange(); 4205 return QualType(); 4206 } 4207 } else { 4208 // Pointee types must be compatible C99 6.5.6p3 4209 if (!Context.typesAreCompatible( 4210 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4211 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4212 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4213 << lex->getType() << rex->getType() 4214 << lex->getSourceRange() << rex->getSourceRange(); 4215 return QualType(); 4216 } 4217 } 4218 4219 if (ComplainAboutVoid) 4220 Diag(Loc, diag::ext_gnu_void_ptr) 4221 << lex->getSourceRange() << rex->getSourceRange(); 4222 if (ComplainAboutFunc) 4223 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4224 << ComplainAboutFunc->getType() 4225 << ComplainAboutFunc->getSourceRange(); 4226 4227 if (CompLHSTy) *CompLHSTy = lex->getType(); 4228 return Context.getPointerDiffType(); 4229 } 4230 } 4231 4232 return InvalidOperands(Loc, lex, rex); 4233} 4234 4235// C99 6.5.7 4236QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4237 bool isCompAssign) { 4238 // C99 6.5.7p2: Each of the operands shall have integer type. 4239 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4240 return InvalidOperands(Loc, lex, rex); 4241 4242 // Shifts don't perform usual arithmetic conversions, they just do integer 4243 // promotions on each operand. C99 6.5.7p3 4244 QualType LHSTy = Context.isPromotableBitField(lex); 4245 if (LHSTy.isNull()) { 4246 LHSTy = lex->getType(); 4247 if (LHSTy->isPromotableIntegerType()) 4248 LHSTy = Context.getPromotedIntegerType(LHSTy); 4249 } 4250 if (!isCompAssign) 4251 ImpCastExprToType(lex, LHSTy); 4252 4253 UsualUnaryConversions(rex); 4254 4255 // Sanity-check shift operands 4256 llvm::APSInt Right; 4257 // Check right/shifter operand 4258 if (rex->isIntegerConstantExpr(Right, Context)) { 4259 if (Right.isNegative()) 4260 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4261 else { 4262 llvm::APInt LeftBits(Right.getBitWidth(), 4263 Context.getTypeSize(lex->getType())); 4264 if (Right.uge(LeftBits)) 4265 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4266 } 4267 } 4268 4269 // "The type of the result is that of the promoted left operand." 4270 return LHSTy; 4271} 4272 4273// C99 6.5.8, C++ [expr.rel] 4274QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4275 unsigned OpaqueOpc, bool isRelational) { 4276 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4277 4278 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4279 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4280 4281 // C99 6.5.8p3 / C99 6.5.9p4 4282 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4283 UsualArithmeticConversions(lex, rex); 4284 else { 4285 UsualUnaryConversions(lex); 4286 UsualUnaryConversions(rex); 4287 } 4288 QualType lType = lex->getType(); 4289 QualType rType = rex->getType(); 4290 4291 if (!lType->isFloatingType() 4292 && !(lType->isBlockPointerType() && isRelational)) { 4293 // For non-floating point types, check for self-comparisons of the form 4294 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4295 // often indicate logic errors in the program. 4296 // NOTE: Don't warn about comparisons of enum constants. These can arise 4297 // from macro expansions, and are usually quite deliberate. 4298 Expr *LHSStripped = lex->IgnoreParens(); 4299 Expr *RHSStripped = rex->IgnoreParens(); 4300 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4301 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4302 if (DRL->getDecl() == DRR->getDecl() && 4303 !isa<EnumConstantDecl>(DRL->getDecl())) 4304 Diag(Loc, diag::warn_selfcomparison); 4305 4306 if (isa<CastExpr>(LHSStripped)) 4307 LHSStripped = LHSStripped->IgnoreParenCasts(); 4308 if (isa<CastExpr>(RHSStripped)) 4309 RHSStripped = RHSStripped->IgnoreParenCasts(); 4310 4311 // Warn about comparisons against a string constant (unless the other 4312 // operand is null), the user probably wants strcmp. 4313 Expr *literalString = 0; 4314 Expr *literalStringStripped = 0; 4315 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4316 !RHSStripped->isNullPointerConstant(Context)) { 4317 literalString = lex; 4318 literalStringStripped = LHSStripped; 4319 } else if ((isa<StringLiteral>(RHSStripped) || 4320 isa<ObjCEncodeExpr>(RHSStripped)) && 4321 !LHSStripped->isNullPointerConstant(Context)) { 4322 literalString = rex; 4323 literalStringStripped = RHSStripped; 4324 } 4325 4326 if (literalString) { 4327 std::string resultComparison; 4328 switch (Opc) { 4329 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4330 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4331 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4332 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4333 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4334 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4335 default: assert(false && "Invalid comparison operator"); 4336 } 4337 Diag(Loc, diag::warn_stringcompare) 4338 << isa<ObjCEncodeExpr>(literalStringStripped) 4339 << literalString->getSourceRange() 4340 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4341 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4342 "strcmp(") 4343 << CodeModificationHint::CreateInsertion( 4344 PP.getLocForEndOfToken(rex->getLocEnd()), 4345 resultComparison); 4346 } 4347 } 4348 4349 // The result of comparisons is 'bool' in C++, 'int' in C. 4350 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4351 4352 if (isRelational) { 4353 if (lType->isRealType() && rType->isRealType()) 4354 return ResultTy; 4355 } else { 4356 // Check for comparisons of floating point operands using != and ==. 4357 if (lType->isFloatingType()) { 4358 assert(rType->isFloatingType()); 4359 CheckFloatComparison(Loc,lex,rex); 4360 } 4361 4362 if (lType->isArithmeticType() && rType->isArithmeticType()) 4363 return ResultTy; 4364 } 4365 4366 bool LHSIsNull = lex->isNullPointerConstant(Context); 4367 bool RHSIsNull = rex->isNullPointerConstant(Context); 4368 4369 // All of the following pointer related warnings are GCC extensions, except 4370 // when handling null pointer constants. One day, we can consider making them 4371 // errors (when -pedantic-errors is enabled). 4372 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4373 QualType LCanPointeeTy = 4374 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4375 QualType RCanPointeeTy = 4376 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4377 4378 if (getLangOptions().CPlusPlus) { 4379 if (LCanPointeeTy == RCanPointeeTy) 4380 return ResultTy; 4381 4382 // C++ [expr.rel]p2: 4383 // [...] Pointer conversions (4.10) and qualification 4384 // conversions (4.4) are performed on pointer operands (or on 4385 // a pointer operand and a null pointer constant) to bring 4386 // them to their composite pointer type. [...] 4387 // 4388 // C++ [expr.eq]p1 uses the same notion for (in)equality 4389 // comparisons of pointers. 4390 QualType T = FindCompositePointerType(lex, rex); 4391 if (T.isNull()) { 4392 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4393 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4394 return QualType(); 4395 } 4396 4397 ImpCastExprToType(lex, T); 4398 ImpCastExprToType(rex, T); 4399 return ResultTy; 4400 } 4401 // C99 6.5.9p2 and C99 6.5.8p2 4402 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4403 RCanPointeeTy.getUnqualifiedType())) { 4404 // Valid unless a relational comparison of function pointers 4405 if (isRelational && LCanPointeeTy->isFunctionType()) { 4406 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4407 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4408 } 4409 } else if (!isRelational && 4410 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4411 // Valid unless comparison between non-null pointer and function pointer 4412 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4413 && !LHSIsNull && !RHSIsNull) { 4414 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4415 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4416 } 4417 } else { 4418 // Invalid 4419 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4420 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4421 } 4422 if (LCanPointeeTy != RCanPointeeTy) 4423 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4424 return ResultTy; 4425 } 4426 4427 if (getLangOptions().CPlusPlus) { 4428 // Comparison of pointers with null pointer constants and equality 4429 // comparisons of member pointers to null pointer constants. 4430 if (RHSIsNull && 4431 (lType->isPointerType() || 4432 (!isRelational && lType->isMemberPointerType()))) { 4433 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4434 return ResultTy; 4435 } 4436 if (LHSIsNull && 4437 (rType->isPointerType() || 4438 (!isRelational && rType->isMemberPointerType()))) { 4439 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4440 return ResultTy; 4441 } 4442 4443 // Comparison of member pointers. 4444 if (!isRelational && 4445 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4446 // C++ [expr.eq]p2: 4447 // In addition, pointers to members can be compared, or a pointer to 4448 // member and a null pointer constant. Pointer to member conversions 4449 // (4.11) and qualification conversions (4.4) are performed to bring 4450 // them to a common type. If one operand is a null pointer constant, 4451 // the common type is the type of the other operand. Otherwise, the 4452 // common type is a pointer to member type similar (4.4) to the type 4453 // of one of the operands, with a cv-qualification signature (4.4) 4454 // that is the union of the cv-qualification signatures of the operand 4455 // types. 4456 QualType T = FindCompositePointerType(lex, rex); 4457 if (T.isNull()) { 4458 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4459 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4460 return QualType(); 4461 } 4462 4463 ImpCastExprToType(lex, T); 4464 ImpCastExprToType(rex, T); 4465 return ResultTy; 4466 } 4467 4468 // Comparison of nullptr_t with itself. 4469 if (lType->isNullPtrType() && rType->isNullPtrType()) 4470 return ResultTy; 4471 } 4472 4473 // Handle block pointer types. 4474 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4475 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4476 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4477 4478 if (!LHSIsNull && !RHSIsNull && 4479 !Context.typesAreCompatible(lpointee, rpointee)) { 4480 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4481 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4482 } 4483 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4484 return ResultTy; 4485 } 4486 // Allow block pointers to be compared with null pointer constants. 4487 if (!isRelational 4488 && ((lType->isBlockPointerType() && rType->isPointerType()) 4489 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4490 if (!LHSIsNull && !RHSIsNull) { 4491 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4492 ->getPointeeType()->isVoidType()) 4493 || (lType->isPointerType() && lType->getAs<PointerType>() 4494 ->getPointeeType()->isVoidType()))) 4495 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4496 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4497 } 4498 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4499 return ResultTy; 4500 } 4501 4502 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4503 if (lType->isPointerType() || rType->isPointerType()) { 4504 const PointerType *LPT = lType->getAs<PointerType>(); 4505 const PointerType *RPT = rType->getAs<PointerType>(); 4506 bool LPtrToVoid = LPT ? 4507 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4508 bool RPtrToVoid = RPT ? 4509 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4510 4511 if (!LPtrToVoid && !RPtrToVoid && 4512 !Context.typesAreCompatible(lType, rType)) { 4513 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4514 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4515 } 4516 ImpCastExprToType(rex, lType); 4517 return ResultTy; 4518 } 4519 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4520 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4521 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4522 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4523 ImpCastExprToType(rex, lType); 4524 return ResultTy; 4525 } 4526 } 4527 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4528 unsigned DiagID = 0; 4529 if (RHSIsNull) { 4530 if (isRelational) 4531 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4532 } else if (isRelational) 4533 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4534 else 4535 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4536 4537 if (DiagID) { 4538 Diag(Loc, DiagID) 4539 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4540 } 4541 ImpCastExprToType(rex, lType); // promote the integer to pointer 4542 return ResultTy; 4543 } 4544 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4545 unsigned DiagID = 0; 4546 if (LHSIsNull) { 4547 if (isRelational) 4548 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4549 } else if (isRelational) 4550 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4551 else 4552 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4553 4554 if (DiagID) { 4555 Diag(Loc, DiagID) 4556 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4557 } 4558 ImpCastExprToType(lex, rType); // promote the integer to pointer 4559 return ResultTy; 4560 } 4561 // Handle block pointers. 4562 if (!isRelational && RHSIsNull 4563 && lType->isBlockPointerType() && rType->isIntegerType()) { 4564 ImpCastExprToType(rex, lType); // promote the integer to pointer 4565 return ResultTy; 4566 } 4567 if (!isRelational && LHSIsNull 4568 && lType->isIntegerType() && rType->isBlockPointerType()) { 4569 ImpCastExprToType(lex, rType); // promote the integer to pointer 4570 return ResultTy; 4571 } 4572 return InvalidOperands(Loc, lex, rex); 4573} 4574 4575/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4576/// operates on extended vector types. Instead of producing an IntTy result, 4577/// like a scalar comparison, a vector comparison produces a vector of integer 4578/// types. 4579QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4580 SourceLocation Loc, 4581 bool isRelational) { 4582 // Check to make sure we're operating on vectors of the same type and width, 4583 // Allowing one side to be a scalar of element type. 4584 QualType vType = CheckVectorOperands(Loc, lex, rex); 4585 if (vType.isNull()) 4586 return vType; 4587 4588 QualType lType = lex->getType(); 4589 QualType rType = rex->getType(); 4590 4591 // For non-floating point types, check for self-comparisons of the form 4592 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4593 // often indicate logic errors in the program. 4594 if (!lType->isFloatingType()) { 4595 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4596 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4597 if (DRL->getDecl() == DRR->getDecl()) 4598 Diag(Loc, diag::warn_selfcomparison); 4599 } 4600 4601 // Check for comparisons of floating point operands using != and ==. 4602 if (!isRelational && lType->isFloatingType()) { 4603 assert (rType->isFloatingType()); 4604 CheckFloatComparison(Loc,lex,rex); 4605 } 4606 4607 // Return the type for the comparison, which is the same as vector type for 4608 // integer vectors, or an integer type of identical size and number of 4609 // elements for floating point vectors. 4610 if (lType->isIntegerType()) 4611 return lType; 4612 4613 const VectorType *VTy = lType->getAsVectorType(); 4614 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4615 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4616 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4617 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4618 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4619 4620 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4621 "Unhandled vector element size in vector compare"); 4622 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4623} 4624 4625inline QualType Sema::CheckBitwiseOperands( 4626 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4627{ 4628 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4629 return CheckVectorOperands(Loc, lex, rex); 4630 4631 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4632 4633 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4634 return compType; 4635 return InvalidOperands(Loc, lex, rex); 4636} 4637 4638inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4639 Expr *&lex, Expr *&rex, SourceLocation Loc) 4640{ 4641 UsualUnaryConversions(lex); 4642 UsualUnaryConversions(rex); 4643 4644 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4645 return Context.IntTy; 4646 return InvalidOperands(Loc, lex, rex); 4647} 4648 4649/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4650/// is a read-only property; return true if so. A readonly property expression 4651/// depends on various declarations and thus must be treated specially. 4652/// 4653static bool IsReadonlyProperty(Expr *E, Sema &S) 4654{ 4655 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4656 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4657 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4658 QualType BaseType = PropExpr->getBase()->getType(); 4659 if (const ObjCObjectPointerType *OPT = 4660 BaseType->getAsObjCInterfacePointerType()) 4661 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4662 if (S.isPropertyReadonly(PDecl, IFace)) 4663 return true; 4664 } 4665 } 4666 return false; 4667} 4668 4669/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4670/// emit an error and return true. If so, return false. 4671static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4672 SourceLocation OrigLoc = Loc; 4673 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4674 &Loc); 4675 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4676 IsLV = Expr::MLV_ReadonlyProperty; 4677 if (IsLV == Expr::MLV_Valid) 4678 return false; 4679 4680 unsigned Diag = 0; 4681 bool NeedType = false; 4682 switch (IsLV) { // C99 6.5.16p2 4683 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4684 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4685 case Expr::MLV_ArrayType: 4686 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4687 NeedType = true; 4688 break; 4689 case Expr::MLV_NotObjectType: 4690 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4691 NeedType = true; 4692 break; 4693 case Expr::MLV_LValueCast: 4694 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4695 break; 4696 case Expr::MLV_InvalidExpression: 4697 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4698 break; 4699 case Expr::MLV_IncompleteType: 4700 case Expr::MLV_IncompleteVoidType: 4701 return S.RequireCompleteType(Loc, E->getType(), 4702 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4703 << E->getSourceRange()); 4704 case Expr::MLV_DuplicateVectorComponents: 4705 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4706 break; 4707 case Expr::MLV_NotBlockQualified: 4708 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4709 break; 4710 case Expr::MLV_ReadonlyProperty: 4711 Diag = diag::error_readonly_property_assignment; 4712 break; 4713 case Expr::MLV_NoSetterProperty: 4714 Diag = diag::error_nosetter_property_assignment; 4715 break; 4716 } 4717 4718 SourceRange Assign; 4719 if (Loc != OrigLoc) 4720 Assign = SourceRange(OrigLoc, OrigLoc); 4721 if (NeedType) 4722 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4723 else 4724 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4725 return true; 4726} 4727 4728 4729 4730// C99 6.5.16.1 4731QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4732 SourceLocation Loc, 4733 QualType CompoundType) { 4734 // Verify that LHS is a modifiable lvalue, and emit error if not. 4735 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4736 return QualType(); 4737 4738 QualType LHSType = LHS->getType(); 4739 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4740 4741 AssignConvertType ConvTy; 4742 if (CompoundType.isNull()) { 4743 // Simple assignment "x = y". 4744 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4745 // Special case of NSObject attributes on c-style pointer types. 4746 if (ConvTy == IncompatiblePointer && 4747 ((Context.isObjCNSObjectType(LHSType) && 4748 RHSType->isObjCObjectPointerType()) || 4749 (Context.isObjCNSObjectType(RHSType) && 4750 LHSType->isObjCObjectPointerType()))) 4751 ConvTy = Compatible; 4752 4753 // If the RHS is a unary plus or minus, check to see if they = and + are 4754 // right next to each other. If so, the user may have typo'd "x =+ 4" 4755 // instead of "x += 4". 4756 Expr *RHSCheck = RHS; 4757 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4758 RHSCheck = ICE->getSubExpr(); 4759 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4760 if ((UO->getOpcode() == UnaryOperator::Plus || 4761 UO->getOpcode() == UnaryOperator::Minus) && 4762 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4763 // Only if the two operators are exactly adjacent. 4764 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4765 // And there is a space or other character before the subexpr of the 4766 // unary +/-. We don't want to warn on "x=-1". 4767 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4768 UO->getSubExpr()->getLocStart().isFileID()) { 4769 Diag(Loc, diag::warn_not_compound_assign) 4770 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4771 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4772 } 4773 } 4774 } else { 4775 // Compound assignment "x += y" 4776 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4777 } 4778 4779 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4780 RHS, "assigning")) 4781 return QualType(); 4782 4783 // C99 6.5.16p3: The type of an assignment expression is the type of the 4784 // left operand unless the left operand has qualified type, in which case 4785 // it is the unqualified version of the type of the left operand. 4786 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4787 // is converted to the type of the assignment expression (above). 4788 // C++ 5.17p1: the type of the assignment expression is that of its left 4789 // operand. 4790 return LHSType.getUnqualifiedType(); 4791} 4792 4793// C99 6.5.17 4794QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4795 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4796 DefaultFunctionArrayConversion(RHS); 4797 4798 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4799 // incomplete in C++). 4800 4801 return RHS->getType(); 4802} 4803 4804/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4805/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4806QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4807 bool isInc) { 4808 if (Op->isTypeDependent()) 4809 return Context.DependentTy; 4810 4811 QualType ResType = Op->getType(); 4812 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4813 4814 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4815 // Decrement of bool is not allowed. 4816 if (!isInc) { 4817 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4818 return QualType(); 4819 } 4820 // Increment of bool sets it to true, but is deprecated. 4821 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4822 } else if (ResType->isRealType()) { 4823 // OK! 4824 } else if (ResType->isAnyPointerType()) { 4825 QualType PointeeTy = ResType->getPointeeType(); 4826 4827 // C99 6.5.2.4p2, 6.5.6p2 4828 if (PointeeTy->isVoidType()) { 4829 if (getLangOptions().CPlusPlus) { 4830 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4831 << Op->getSourceRange(); 4832 return QualType(); 4833 } 4834 4835 // Pointer to void is a GNU extension in C. 4836 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4837 } else if (PointeeTy->isFunctionType()) { 4838 if (getLangOptions().CPlusPlus) { 4839 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4840 << Op->getType() << Op->getSourceRange(); 4841 return QualType(); 4842 } 4843 4844 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4845 << ResType << Op->getSourceRange(); 4846 } else if (RequireCompleteType(OpLoc, PointeeTy, 4847 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4848 << Op->getSourceRange() 4849 << ResType)) 4850 return QualType(); 4851 // Diagnose bad cases where we step over interface counts. 4852 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4853 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 4854 << PointeeTy << Op->getSourceRange(); 4855 return QualType(); 4856 } 4857 } else if (ResType->isComplexType()) { 4858 // C99 does not support ++/-- on complex types, we allow as an extension. 4859 Diag(OpLoc, diag::ext_integer_increment_complex) 4860 << ResType << Op->getSourceRange(); 4861 } else { 4862 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4863 << ResType << Op->getSourceRange(); 4864 return QualType(); 4865 } 4866 // At this point, we know we have a real, complex or pointer type. 4867 // Now make sure the operand is a modifiable lvalue. 4868 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4869 return QualType(); 4870 return ResType; 4871} 4872 4873/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4874/// This routine allows us to typecheck complex/recursive expressions 4875/// where the declaration is needed for type checking. We only need to 4876/// handle cases when the expression references a function designator 4877/// or is an lvalue. Here are some examples: 4878/// - &(x) => x 4879/// - &*****f => f for f a function designator. 4880/// - &s.xx => s 4881/// - &s.zz[1].yy -> s, if zz is an array 4882/// - *(x + 1) -> x, if x is an array 4883/// - &"123"[2] -> 0 4884/// - & __real__ x -> x 4885static NamedDecl *getPrimaryDecl(Expr *E) { 4886 switch (E->getStmtClass()) { 4887 case Stmt::DeclRefExprClass: 4888 case Stmt::QualifiedDeclRefExprClass: 4889 return cast<DeclRefExpr>(E)->getDecl(); 4890 case Stmt::MemberExprClass: 4891 // If this is an arrow operator, the address is an offset from 4892 // the base's value, so the object the base refers to is 4893 // irrelevant. 4894 if (cast<MemberExpr>(E)->isArrow()) 4895 return 0; 4896 // Otherwise, the expression refers to a part of the base 4897 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4898 case Stmt::ArraySubscriptExprClass: { 4899 // FIXME: This code shouldn't be necessary! We should catch the implicit 4900 // promotion of register arrays earlier. 4901 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4902 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4903 if (ICE->getSubExpr()->getType()->isArrayType()) 4904 return getPrimaryDecl(ICE->getSubExpr()); 4905 } 4906 return 0; 4907 } 4908 case Stmt::UnaryOperatorClass: { 4909 UnaryOperator *UO = cast<UnaryOperator>(E); 4910 4911 switch(UO->getOpcode()) { 4912 case UnaryOperator::Real: 4913 case UnaryOperator::Imag: 4914 case UnaryOperator::Extension: 4915 return getPrimaryDecl(UO->getSubExpr()); 4916 default: 4917 return 0; 4918 } 4919 } 4920 case Stmt::ParenExprClass: 4921 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4922 case Stmt::ImplicitCastExprClass: 4923 // If the result of an implicit cast is an l-value, we care about 4924 // the sub-expression; otherwise, the result here doesn't matter. 4925 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4926 default: 4927 return 0; 4928 } 4929} 4930 4931/// CheckAddressOfOperand - The operand of & must be either a function 4932/// designator or an lvalue designating an object. If it is an lvalue, the 4933/// object cannot be declared with storage class register or be a bit field. 4934/// Note: The usual conversions are *not* applied to the operand of the & 4935/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4936/// In C++, the operand might be an overloaded function name, in which case 4937/// we allow the '&' but retain the overloaded-function type. 4938QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4939 // Make sure to ignore parentheses in subsequent checks 4940 op = op->IgnoreParens(); 4941 4942 if (op->isTypeDependent()) 4943 return Context.DependentTy; 4944 4945 if (getLangOptions().C99) { 4946 // Implement C99-only parts of addressof rules. 4947 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4948 if (uOp->getOpcode() == UnaryOperator::Deref) 4949 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4950 // (assuming the deref expression is valid). 4951 return uOp->getSubExpr()->getType(); 4952 } 4953 // Technically, there should be a check for array subscript 4954 // expressions here, but the result of one is always an lvalue anyway. 4955 } 4956 NamedDecl *dcl = getPrimaryDecl(op); 4957 Expr::isLvalueResult lval = op->isLvalue(Context); 4958 4959 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4960 // C99 6.5.3.2p1 4961 // The operand must be either an l-value or a function designator 4962 if (!op->getType()->isFunctionType()) { 4963 // FIXME: emit more specific diag... 4964 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4965 << op->getSourceRange(); 4966 return QualType(); 4967 } 4968 } else if (op->getBitField()) { // C99 6.5.3.2p1 4969 // The operand cannot be a bit-field 4970 Diag(OpLoc, diag::err_typecheck_address_of) 4971 << "bit-field" << op->getSourceRange(); 4972 return QualType(); 4973 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4974 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4975 // The operand cannot be an element of a vector 4976 Diag(OpLoc, diag::err_typecheck_address_of) 4977 << "vector element" << op->getSourceRange(); 4978 return QualType(); 4979 } else if (isa<ObjCPropertyRefExpr>(op)) { 4980 // cannot take address of a property expression. 4981 Diag(OpLoc, diag::err_typecheck_address_of) 4982 << "property expression" << op->getSourceRange(); 4983 return QualType(); 4984 } else if (dcl) { // C99 6.5.3.2p1 4985 // We have an lvalue with a decl. Make sure the decl is not declared 4986 // with the register storage-class specifier. 4987 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4988 if (vd->getStorageClass() == VarDecl::Register) { 4989 Diag(OpLoc, diag::err_typecheck_address_of) 4990 << "register variable" << op->getSourceRange(); 4991 return QualType(); 4992 } 4993 } else if (isa<OverloadedFunctionDecl>(dcl) || 4994 isa<FunctionTemplateDecl>(dcl)) { 4995 return Context.OverloadTy; 4996 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 4997 // Okay: we can take the address of a field. 4998 // Could be a pointer to member, though, if there is an explicit 4999 // scope qualifier for the class. 5000 if (isa<QualifiedDeclRefExpr>(op)) { 5001 DeclContext *Ctx = dcl->getDeclContext(); 5002 if (Ctx && Ctx->isRecord()) { 5003 if (FD->getType()->isReferenceType()) { 5004 Diag(OpLoc, 5005 diag::err_cannot_form_pointer_to_member_of_reference_type) 5006 << FD->getDeclName() << FD->getType(); 5007 return QualType(); 5008 } 5009 5010 return Context.getMemberPointerType(op->getType(), 5011 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5012 } 5013 } 5014 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5015 // Okay: we can take the address of a function. 5016 // As above. 5017 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 5018 return Context.getMemberPointerType(op->getType(), 5019 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5020 } else if (!isa<FunctionDecl>(dcl)) 5021 assert(0 && "Unknown/unexpected decl type"); 5022 } 5023 5024 if (lval == Expr::LV_IncompleteVoidType) { 5025 // Taking the address of a void variable is technically illegal, but we 5026 // allow it in cases which are otherwise valid. 5027 // Example: "extern void x; void* y = &x;". 5028 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5029 } 5030 5031 // If the operand has type "type", the result has type "pointer to type". 5032 return Context.getPointerType(op->getType()); 5033} 5034 5035QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5036 if (Op->isTypeDependent()) 5037 return Context.DependentTy; 5038 5039 UsualUnaryConversions(Op); 5040 QualType Ty = Op->getType(); 5041 5042 // Note that per both C89 and C99, this is always legal, even if ptype is an 5043 // incomplete type or void. It would be possible to warn about dereferencing 5044 // a void pointer, but it's completely well-defined, and such a warning is 5045 // unlikely to catch any mistakes. 5046 if (const PointerType *PT = Ty->getAs<PointerType>()) 5047 return PT->getPointeeType(); 5048 5049 if (const ObjCObjectPointerType *OPT = Ty->getAsObjCObjectPointerType()) 5050 return OPT->getPointeeType(); 5051 5052 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5053 << Ty << Op->getSourceRange(); 5054 return QualType(); 5055} 5056 5057static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5058 tok::TokenKind Kind) { 5059 BinaryOperator::Opcode Opc; 5060 switch (Kind) { 5061 default: assert(0 && "Unknown binop!"); 5062 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5063 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5064 case tok::star: Opc = BinaryOperator::Mul; break; 5065 case tok::slash: Opc = BinaryOperator::Div; break; 5066 case tok::percent: Opc = BinaryOperator::Rem; break; 5067 case tok::plus: Opc = BinaryOperator::Add; break; 5068 case tok::minus: Opc = BinaryOperator::Sub; break; 5069 case tok::lessless: Opc = BinaryOperator::Shl; break; 5070 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5071 case tok::lessequal: Opc = BinaryOperator::LE; break; 5072 case tok::less: Opc = BinaryOperator::LT; break; 5073 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5074 case tok::greater: Opc = BinaryOperator::GT; break; 5075 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5076 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5077 case tok::amp: Opc = BinaryOperator::And; break; 5078 case tok::caret: Opc = BinaryOperator::Xor; break; 5079 case tok::pipe: Opc = BinaryOperator::Or; break; 5080 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5081 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5082 case tok::equal: Opc = BinaryOperator::Assign; break; 5083 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5084 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5085 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5086 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5087 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5088 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5089 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5090 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5091 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5092 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5093 case tok::comma: Opc = BinaryOperator::Comma; break; 5094 } 5095 return Opc; 5096} 5097 5098static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5099 tok::TokenKind Kind) { 5100 UnaryOperator::Opcode Opc; 5101 switch (Kind) { 5102 default: assert(0 && "Unknown unary op!"); 5103 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5104 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5105 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5106 case tok::star: Opc = UnaryOperator::Deref; break; 5107 case tok::plus: Opc = UnaryOperator::Plus; break; 5108 case tok::minus: Opc = UnaryOperator::Minus; break; 5109 case tok::tilde: Opc = UnaryOperator::Not; break; 5110 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5111 case tok::kw___real: Opc = UnaryOperator::Real; break; 5112 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5113 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5114 } 5115 return Opc; 5116} 5117 5118/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5119/// operator @p Opc at location @c TokLoc. This routine only supports 5120/// built-in operations; ActOnBinOp handles overloaded operators. 5121Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5122 unsigned Op, 5123 Expr *lhs, Expr *rhs) { 5124 QualType ResultTy; // Result type of the binary operator. 5125 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5126 // The following two variables are used for compound assignment operators 5127 QualType CompLHSTy; // Type of LHS after promotions for computation 5128 QualType CompResultTy; // Type of computation result 5129 5130 switch (Opc) { 5131 case BinaryOperator::Assign: 5132 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5133 break; 5134 case BinaryOperator::PtrMemD: 5135 case BinaryOperator::PtrMemI: 5136 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5137 Opc == BinaryOperator::PtrMemI); 5138 break; 5139 case BinaryOperator::Mul: 5140 case BinaryOperator::Div: 5141 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5142 break; 5143 case BinaryOperator::Rem: 5144 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5145 break; 5146 case BinaryOperator::Add: 5147 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5148 break; 5149 case BinaryOperator::Sub: 5150 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5151 break; 5152 case BinaryOperator::Shl: 5153 case BinaryOperator::Shr: 5154 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5155 break; 5156 case BinaryOperator::LE: 5157 case BinaryOperator::LT: 5158 case BinaryOperator::GE: 5159 case BinaryOperator::GT: 5160 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5161 break; 5162 case BinaryOperator::EQ: 5163 case BinaryOperator::NE: 5164 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5165 break; 5166 case BinaryOperator::And: 5167 case BinaryOperator::Xor: 5168 case BinaryOperator::Or: 5169 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5170 break; 5171 case BinaryOperator::LAnd: 5172 case BinaryOperator::LOr: 5173 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5174 break; 5175 case BinaryOperator::MulAssign: 5176 case BinaryOperator::DivAssign: 5177 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5178 CompLHSTy = CompResultTy; 5179 if (!CompResultTy.isNull()) 5180 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5181 break; 5182 case BinaryOperator::RemAssign: 5183 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5184 CompLHSTy = CompResultTy; 5185 if (!CompResultTy.isNull()) 5186 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5187 break; 5188 case BinaryOperator::AddAssign: 5189 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5190 if (!CompResultTy.isNull()) 5191 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5192 break; 5193 case BinaryOperator::SubAssign: 5194 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5195 if (!CompResultTy.isNull()) 5196 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5197 break; 5198 case BinaryOperator::ShlAssign: 5199 case BinaryOperator::ShrAssign: 5200 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5201 CompLHSTy = CompResultTy; 5202 if (!CompResultTy.isNull()) 5203 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5204 break; 5205 case BinaryOperator::AndAssign: 5206 case BinaryOperator::XorAssign: 5207 case BinaryOperator::OrAssign: 5208 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5209 CompLHSTy = CompResultTy; 5210 if (!CompResultTy.isNull()) 5211 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5212 break; 5213 case BinaryOperator::Comma: 5214 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5215 break; 5216 } 5217 if (ResultTy.isNull()) 5218 return ExprError(); 5219 if (CompResultTy.isNull()) 5220 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5221 else 5222 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5223 CompLHSTy, CompResultTy, 5224 OpLoc)); 5225} 5226 5227// Binary Operators. 'Tok' is the token for the operator. 5228Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5229 tok::TokenKind Kind, 5230 ExprArg LHS, ExprArg RHS) { 5231 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5232 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5233 5234 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5235 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5236 5237 if (getLangOptions().CPlusPlus && 5238 (lhs->getType()->isOverloadableType() || 5239 rhs->getType()->isOverloadableType())) { 5240 // Find all of the overloaded operators visible from this 5241 // point. We perform both an operator-name lookup from the local 5242 // scope and an argument-dependent lookup based on the types of 5243 // the arguments. 5244 FunctionSet Functions; 5245 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5246 if (OverOp != OO_None) { 5247 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5248 Functions); 5249 Expr *Args[2] = { lhs, rhs }; 5250 DeclarationName OpName 5251 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5252 ArgumentDependentLookup(OpName, Args, 2, Functions); 5253 } 5254 5255 // Build the (potentially-overloaded, potentially-dependent) 5256 // binary operation. 5257 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5258 } 5259 5260 // Build a built-in binary operation. 5261 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5262} 5263 5264Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5265 unsigned OpcIn, 5266 ExprArg InputArg) { 5267 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5268 5269 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5270 Expr *Input = (Expr *)InputArg.get(); 5271 QualType resultType; 5272 switch (Opc) { 5273 case UnaryOperator::OffsetOf: 5274 assert(false && "Invalid unary operator"); 5275 break; 5276 5277 case UnaryOperator::PreInc: 5278 case UnaryOperator::PreDec: 5279 case UnaryOperator::PostInc: 5280 case UnaryOperator::PostDec: 5281 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5282 Opc == UnaryOperator::PreInc || 5283 Opc == UnaryOperator::PostInc); 5284 break; 5285 case UnaryOperator::AddrOf: 5286 resultType = CheckAddressOfOperand(Input, OpLoc); 5287 break; 5288 case UnaryOperator::Deref: 5289 DefaultFunctionArrayConversion(Input); 5290 resultType = CheckIndirectionOperand(Input, OpLoc); 5291 break; 5292 case UnaryOperator::Plus: 5293 case UnaryOperator::Minus: 5294 UsualUnaryConversions(Input); 5295 resultType = Input->getType(); 5296 if (resultType->isDependentType()) 5297 break; 5298 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5299 break; 5300 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5301 resultType->isEnumeralType()) 5302 break; 5303 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5304 Opc == UnaryOperator::Plus && 5305 resultType->isPointerType()) 5306 break; 5307 5308 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5309 << resultType << Input->getSourceRange()); 5310 case UnaryOperator::Not: // bitwise complement 5311 UsualUnaryConversions(Input); 5312 resultType = Input->getType(); 5313 if (resultType->isDependentType()) 5314 break; 5315 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5316 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5317 // C99 does not support '~' for complex conjugation. 5318 Diag(OpLoc, diag::ext_integer_complement_complex) 5319 << resultType << Input->getSourceRange(); 5320 else if (!resultType->isIntegerType()) 5321 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5322 << resultType << Input->getSourceRange()); 5323 break; 5324 case UnaryOperator::LNot: // logical negation 5325 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5326 DefaultFunctionArrayConversion(Input); 5327 resultType = Input->getType(); 5328 if (resultType->isDependentType()) 5329 break; 5330 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5331 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5332 << resultType << Input->getSourceRange()); 5333 // LNot always has type int. C99 6.5.3.3p5. 5334 // In C++, it's bool. C++ 5.3.1p8 5335 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5336 break; 5337 case UnaryOperator::Real: 5338 case UnaryOperator::Imag: 5339 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5340 break; 5341 case UnaryOperator::Extension: 5342 resultType = Input->getType(); 5343 break; 5344 } 5345 if (resultType.isNull()) 5346 return ExprError(); 5347 5348 InputArg.release(); 5349 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5350} 5351 5352// Unary Operators. 'Tok' is the token for the operator. 5353Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5354 tok::TokenKind Op, ExprArg input) { 5355 Expr *Input = (Expr*)input.get(); 5356 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5357 5358 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5359 // Find all of the overloaded operators visible from this 5360 // point. We perform both an operator-name lookup from the local 5361 // scope and an argument-dependent lookup based on the types of 5362 // the arguments. 5363 FunctionSet Functions; 5364 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5365 if (OverOp != OO_None) { 5366 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5367 Functions); 5368 DeclarationName OpName 5369 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5370 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5371 } 5372 5373 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5374 } 5375 5376 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5377} 5378 5379/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5380Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5381 SourceLocation LabLoc, 5382 IdentifierInfo *LabelII) { 5383 // Look up the record for this label identifier. 5384 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5385 5386 // If we haven't seen this label yet, create a forward reference. It 5387 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5388 if (LabelDecl == 0) 5389 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5390 5391 // Create the AST node. The address of a label always has type 'void*'. 5392 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5393 Context.getPointerType(Context.VoidTy))); 5394} 5395 5396Sema::OwningExprResult 5397Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5398 SourceLocation RPLoc) { // "({..})" 5399 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5400 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5401 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5402 5403 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5404 if (isFileScope) 5405 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5406 5407 // FIXME: there are a variety of strange constraints to enforce here, for 5408 // example, it is not possible to goto into a stmt expression apparently. 5409 // More semantic analysis is needed. 5410 5411 // If there are sub stmts in the compound stmt, take the type of the last one 5412 // as the type of the stmtexpr. 5413 QualType Ty = Context.VoidTy; 5414 5415 if (!Compound->body_empty()) { 5416 Stmt *LastStmt = Compound->body_back(); 5417 // If LastStmt is a label, skip down through into the body. 5418 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5419 LastStmt = Label->getSubStmt(); 5420 5421 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5422 Ty = LastExpr->getType(); 5423 } 5424 5425 // FIXME: Check that expression type is complete/non-abstract; statement 5426 // expressions are not lvalues. 5427 5428 substmt.release(); 5429 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5430} 5431 5432Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5433 SourceLocation BuiltinLoc, 5434 SourceLocation TypeLoc, 5435 TypeTy *argty, 5436 OffsetOfComponent *CompPtr, 5437 unsigned NumComponents, 5438 SourceLocation RPLoc) { 5439 // FIXME: This function leaks all expressions in the offset components on 5440 // error. 5441 // FIXME: Preserve type source info. 5442 QualType ArgTy = GetTypeFromParser(argty); 5443 assert(!ArgTy.isNull() && "Missing type argument!"); 5444 5445 bool Dependent = ArgTy->isDependentType(); 5446 5447 // We must have at least one component that refers to the type, and the first 5448 // one is known to be a field designator. Verify that the ArgTy represents 5449 // a struct/union/class. 5450 if (!Dependent && !ArgTy->isRecordType()) 5451 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5452 5453 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5454 // with an incomplete type would be illegal. 5455 5456 // Otherwise, create a null pointer as the base, and iteratively process 5457 // the offsetof designators. 5458 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5459 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5460 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5461 ArgTy, SourceLocation()); 5462 5463 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5464 // GCC extension, diagnose them. 5465 // FIXME: This diagnostic isn't actually visible because the location is in 5466 // a system header! 5467 if (NumComponents != 1) 5468 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5469 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5470 5471 if (!Dependent) { 5472 bool DidWarnAboutNonPOD = false; 5473 5474 // FIXME: Dependent case loses a lot of information here. And probably 5475 // leaks like a sieve. 5476 for (unsigned i = 0; i != NumComponents; ++i) { 5477 const OffsetOfComponent &OC = CompPtr[i]; 5478 if (OC.isBrackets) { 5479 // Offset of an array sub-field. TODO: Should we allow vector elements? 5480 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5481 if (!AT) { 5482 Res->Destroy(Context); 5483 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5484 << Res->getType()); 5485 } 5486 5487 // FIXME: C++: Verify that operator[] isn't overloaded. 5488 5489 // Promote the array so it looks more like a normal array subscript 5490 // expression. 5491 DefaultFunctionArrayConversion(Res); 5492 5493 // C99 6.5.2.1p1 5494 Expr *Idx = static_cast<Expr*>(OC.U.E); 5495 // FIXME: Leaks Res 5496 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5497 return ExprError(Diag(Idx->getLocStart(), 5498 diag::err_typecheck_subscript_not_integer) 5499 << Idx->getSourceRange()); 5500 5501 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5502 OC.LocEnd); 5503 continue; 5504 } 5505 5506 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5507 if (!RC) { 5508 Res->Destroy(Context); 5509 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5510 << Res->getType()); 5511 } 5512 5513 // Get the decl corresponding to this. 5514 RecordDecl *RD = RC->getDecl(); 5515 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5516 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5517 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5518 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5519 << Res->getType()); 5520 DidWarnAboutNonPOD = true; 5521 } 5522 } 5523 5524 FieldDecl *MemberDecl 5525 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5526 LookupMemberName) 5527 .getAsDecl()); 5528 // FIXME: Leaks Res 5529 if (!MemberDecl) 5530 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member_deprecated) 5531 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5532 5533 // FIXME: C++: Verify that MemberDecl isn't a static field. 5534 // FIXME: Verify that MemberDecl isn't a bitfield. 5535 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5536 Res = BuildAnonymousStructUnionMemberReference( 5537 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5538 } else { 5539 // MemberDecl->getType() doesn't get the right qualifiers, but it 5540 // doesn't matter here. 5541 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5542 MemberDecl->getType().getNonReferenceType()); 5543 } 5544 } 5545 } 5546 5547 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5548 Context.getSizeType(), BuiltinLoc)); 5549} 5550 5551 5552Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5553 TypeTy *arg1,TypeTy *arg2, 5554 SourceLocation RPLoc) { 5555 // FIXME: Preserve type source info. 5556 QualType argT1 = GetTypeFromParser(arg1); 5557 QualType argT2 = GetTypeFromParser(arg2); 5558 5559 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5560 5561 if (getLangOptions().CPlusPlus) { 5562 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5563 << SourceRange(BuiltinLoc, RPLoc); 5564 return ExprError(); 5565 } 5566 5567 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5568 argT1, argT2, RPLoc)); 5569} 5570 5571Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5572 ExprArg cond, 5573 ExprArg expr1, ExprArg expr2, 5574 SourceLocation RPLoc) { 5575 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5576 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5577 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5578 5579 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5580 5581 QualType resType; 5582 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5583 resType = Context.DependentTy; 5584 } else { 5585 // The conditional expression is required to be a constant expression. 5586 llvm::APSInt condEval(32); 5587 SourceLocation ExpLoc; 5588 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5589 return ExprError(Diag(ExpLoc, 5590 diag::err_typecheck_choose_expr_requires_constant) 5591 << CondExpr->getSourceRange()); 5592 5593 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5594 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5595 } 5596 5597 cond.release(); expr1.release(); expr2.release(); 5598 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5599 resType, RPLoc)); 5600} 5601 5602//===----------------------------------------------------------------------===// 5603// Clang Extensions. 5604//===----------------------------------------------------------------------===// 5605 5606/// ActOnBlockStart - This callback is invoked when a block literal is started. 5607void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5608 // Analyze block parameters. 5609 BlockSemaInfo *BSI = new BlockSemaInfo(); 5610 5611 // Add BSI to CurBlock. 5612 BSI->PrevBlockInfo = CurBlock; 5613 CurBlock = BSI; 5614 5615 BSI->ReturnType = QualType(); 5616 BSI->TheScope = BlockScope; 5617 BSI->hasBlockDeclRefExprs = false; 5618 BSI->hasPrototype = false; 5619 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5620 CurFunctionNeedsScopeChecking = false; 5621 5622 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5623 PushDeclContext(BlockScope, BSI->TheDecl); 5624} 5625 5626void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5627 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5628 5629 if (ParamInfo.getNumTypeObjects() == 0 5630 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5631 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5632 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5633 5634 if (T->isArrayType()) { 5635 Diag(ParamInfo.getSourceRange().getBegin(), 5636 diag::err_block_returns_array); 5637 return; 5638 } 5639 5640 // The parameter list is optional, if there was none, assume (). 5641 if (!T->isFunctionType()) 5642 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5643 5644 CurBlock->hasPrototype = true; 5645 CurBlock->isVariadic = false; 5646 // Check for a valid sentinel attribute on this block. 5647 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5648 Diag(ParamInfo.getAttributes()->getLoc(), 5649 diag::warn_attribute_sentinel_not_variadic) << 1; 5650 // FIXME: remove the attribute. 5651 } 5652 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5653 5654 // Do not allow returning a objc interface by-value. 5655 if (RetTy->isObjCInterfaceType()) { 5656 Diag(ParamInfo.getSourceRange().getBegin(), 5657 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5658 return; 5659 } 5660 return; 5661 } 5662 5663 // Analyze arguments to block. 5664 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5665 "Not a function declarator!"); 5666 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5667 5668 CurBlock->hasPrototype = FTI.hasPrototype; 5669 CurBlock->isVariadic = true; 5670 5671 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5672 // no arguments, not a function that takes a single void argument. 5673 if (FTI.hasPrototype && 5674 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5675 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5676 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5677 // empty arg list, don't push any params. 5678 CurBlock->isVariadic = false; 5679 } else if (FTI.hasPrototype) { 5680 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5681 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5682 CurBlock->isVariadic = FTI.isVariadic; 5683 } 5684 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5685 CurBlock->Params.size()); 5686 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5687 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5688 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5689 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5690 // If this has an identifier, add it to the scope stack. 5691 if ((*AI)->getIdentifier()) 5692 PushOnScopeChains(*AI, CurBlock->TheScope); 5693 5694 // Check for a valid sentinel attribute on this block. 5695 if (!CurBlock->isVariadic && 5696 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5697 Diag(ParamInfo.getAttributes()->getLoc(), 5698 diag::warn_attribute_sentinel_not_variadic) << 1; 5699 // FIXME: remove the attribute. 5700 } 5701 5702 // Analyze the return type. 5703 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5704 QualType RetTy = T->getAsFunctionType()->getResultType(); 5705 5706 // Do not allow returning a objc interface by-value. 5707 if (RetTy->isObjCInterfaceType()) { 5708 Diag(ParamInfo.getSourceRange().getBegin(), 5709 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5710 } else if (!RetTy->isDependentType()) 5711 CurBlock->ReturnType = RetTy; 5712} 5713 5714/// ActOnBlockError - If there is an error parsing a block, this callback 5715/// is invoked to pop the information about the block from the action impl. 5716void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5717 // Ensure that CurBlock is deleted. 5718 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5719 5720 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5721 5722 // Pop off CurBlock, handle nested blocks. 5723 PopDeclContext(); 5724 CurBlock = CurBlock->PrevBlockInfo; 5725 // FIXME: Delete the ParmVarDecl objects as well??? 5726} 5727 5728/// ActOnBlockStmtExpr - This is called when the body of a block statement 5729/// literal was successfully completed. ^(int x){...} 5730Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5731 StmtArg body, Scope *CurScope) { 5732 // If blocks are disabled, emit an error. 5733 if (!LangOpts.Blocks) 5734 Diag(CaretLoc, diag::err_blocks_disable); 5735 5736 // Ensure that CurBlock is deleted. 5737 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5738 5739 PopDeclContext(); 5740 5741 // Pop off CurBlock, handle nested blocks. 5742 CurBlock = CurBlock->PrevBlockInfo; 5743 5744 QualType RetTy = Context.VoidTy; 5745 if (!BSI->ReturnType.isNull()) 5746 RetTy = BSI->ReturnType; 5747 5748 llvm::SmallVector<QualType, 8> ArgTypes; 5749 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5750 ArgTypes.push_back(BSI->Params[i]->getType()); 5751 5752 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5753 QualType BlockTy; 5754 if (!BSI->hasPrototype) 5755 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5756 NoReturn); 5757 else 5758 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5759 BSI->isVariadic, 0, false, false, 0, 0, 5760 NoReturn); 5761 5762 // FIXME: Check that return/parameter types are complete/non-abstract 5763 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5764 BlockTy = Context.getBlockPointerType(BlockTy); 5765 5766 // If needed, diagnose invalid gotos and switches in the block. 5767 if (CurFunctionNeedsScopeChecking) 5768 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5769 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5770 5771 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5772 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5773 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5774 BSI->hasBlockDeclRefExprs)); 5775} 5776 5777Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5778 ExprArg expr, TypeTy *type, 5779 SourceLocation RPLoc) { 5780 QualType T = GetTypeFromParser(type); 5781 Expr *E = static_cast<Expr*>(expr.get()); 5782 Expr *OrigExpr = E; 5783 5784 InitBuiltinVaListType(); 5785 5786 // Get the va_list type 5787 QualType VaListType = Context.getBuiltinVaListType(); 5788 if (VaListType->isArrayType()) { 5789 // Deal with implicit array decay; for example, on x86-64, 5790 // va_list is an array, but it's supposed to decay to 5791 // a pointer for va_arg. 5792 VaListType = Context.getArrayDecayedType(VaListType); 5793 // Make sure the input expression also decays appropriately. 5794 UsualUnaryConversions(E); 5795 } else { 5796 // Otherwise, the va_list argument must be an l-value because 5797 // it is modified by va_arg. 5798 if (!E->isTypeDependent() && 5799 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5800 return ExprError(); 5801 } 5802 5803 if (!E->isTypeDependent() && 5804 !Context.hasSameType(VaListType, E->getType())) { 5805 return ExprError(Diag(E->getLocStart(), 5806 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5807 << OrigExpr->getType() << E->getSourceRange()); 5808 } 5809 5810 // FIXME: Check that type is complete/non-abstract 5811 // FIXME: Warn if a non-POD type is passed in. 5812 5813 expr.release(); 5814 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5815 RPLoc)); 5816} 5817 5818Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5819 // The type of __null will be int or long, depending on the size of 5820 // pointers on the target. 5821 QualType Ty; 5822 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5823 Ty = Context.IntTy; 5824 else 5825 Ty = Context.LongTy; 5826 5827 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5828} 5829 5830bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5831 SourceLocation Loc, 5832 QualType DstType, QualType SrcType, 5833 Expr *SrcExpr, const char *Flavor) { 5834 // Decode the result (notice that AST's are still created for extensions). 5835 bool isInvalid = false; 5836 unsigned DiagKind; 5837 switch (ConvTy) { 5838 default: assert(0 && "Unknown conversion type"); 5839 case Compatible: return false; 5840 case PointerToInt: 5841 DiagKind = diag::ext_typecheck_convert_pointer_int; 5842 break; 5843 case IntToPointer: 5844 DiagKind = diag::ext_typecheck_convert_int_pointer; 5845 break; 5846 case IncompatiblePointer: 5847 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5848 break; 5849 case IncompatiblePointerSign: 5850 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5851 break; 5852 case FunctionVoidPointer: 5853 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5854 break; 5855 case CompatiblePointerDiscardsQualifiers: 5856 // If the qualifiers lost were because we were applying the 5857 // (deprecated) C++ conversion from a string literal to a char* 5858 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5859 // Ideally, this check would be performed in 5860 // CheckPointerTypesForAssignment. However, that would require a 5861 // bit of refactoring (so that the second argument is an 5862 // expression, rather than a type), which should be done as part 5863 // of a larger effort to fix CheckPointerTypesForAssignment for 5864 // C++ semantics. 5865 if (getLangOptions().CPlusPlus && 5866 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5867 return false; 5868 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5869 break; 5870 case IntToBlockPointer: 5871 DiagKind = diag::err_int_to_block_pointer; 5872 break; 5873 case IncompatibleBlockPointer: 5874 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5875 break; 5876 case IncompatibleObjCQualifiedId: 5877 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5878 // it can give a more specific diagnostic. 5879 DiagKind = diag::warn_incompatible_qualified_id; 5880 break; 5881 case IncompatibleVectors: 5882 DiagKind = diag::warn_incompatible_vectors; 5883 break; 5884 case Incompatible: 5885 DiagKind = diag::err_typecheck_convert_incompatible; 5886 isInvalid = true; 5887 break; 5888 } 5889 5890 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5891 << SrcExpr->getSourceRange(); 5892 return isInvalid; 5893} 5894 5895bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5896 llvm::APSInt ICEResult; 5897 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5898 if (Result) 5899 *Result = ICEResult; 5900 return false; 5901 } 5902 5903 Expr::EvalResult EvalResult; 5904 5905 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5906 EvalResult.HasSideEffects) { 5907 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5908 5909 if (EvalResult.Diag) { 5910 // We only show the note if it's not the usual "invalid subexpression" 5911 // or if it's actually in a subexpression. 5912 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5913 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5914 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5915 } 5916 5917 return true; 5918 } 5919 5920 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5921 E->getSourceRange(); 5922 5923 if (EvalResult.Diag && 5924 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5925 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5926 5927 if (Result) 5928 *Result = EvalResult.Val.getInt(); 5929 return false; 5930} 5931 5932Sema::ExpressionEvaluationContext 5933Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5934 // Introduce a new set of potentially referenced declarations to the stack. 5935 if (NewContext == PotentiallyPotentiallyEvaluated) 5936 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5937 5938 std::swap(ExprEvalContext, NewContext); 5939 return NewContext; 5940} 5941 5942void 5943Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5944 ExpressionEvaluationContext NewContext) { 5945 ExprEvalContext = NewContext; 5946 5947 if (OldContext == PotentiallyPotentiallyEvaluated) { 5948 // Mark any remaining declarations in the current position of the stack 5949 // as "referenced". If they were not meant to be referenced, semantic 5950 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5951 PotentiallyReferencedDecls RemainingDecls; 5952 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5953 PotentiallyReferencedDeclStack.pop_back(); 5954 5955 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5956 IEnd = RemainingDecls.end(); 5957 I != IEnd; ++I) 5958 MarkDeclarationReferenced(I->first, I->second); 5959 } 5960} 5961 5962/// \brief Note that the given declaration was referenced in the source code. 5963/// 5964/// This routine should be invoke whenever a given declaration is referenced 5965/// in the source code, and where that reference occurred. If this declaration 5966/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5967/// C99 6.9p3), then the declaration will be marked as used. 5968/// 5969/// \param Loc the location where the declaration was referenced. 5970/// 5971/// \param D the declaration that has been referenced by the source code. 5972void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5973 assert(D && "No declaration?"); 5974 5975 if (D->isUsed()) 5976 return; 5977 5978 // Mark a parameter declaration "used", regardless of whether we're in a 5979 // template or not. 5980 if (isa<ParmVarDecl>(D)) 5981 D->setUsed(true); 5982 5983 // Do not mark anything as "used" within a dependent context; wait for 5984 // an instantiation. 5985 if (CurContext->isDependentContext()) 5986 return; 5987 5988 switch (ExprEvalContext) { 5989 case Unevaluated: 5990 // We are in an expression that is not potentially evaluated; do nothing. 5991 return; 5992 5993 case PotentiallyEvaluated: 5994 // We are in a potentially-evaluated expression, so this declaration is 5995 // "used"; handle this below. 5996 break; 5997 5998 case PotentiallyPotentiallyEvaluated: 5999 // We are in an expression that may be potentially evaluated; queue this 6000 // declaration reference until we know whether the expression is 6001 // potentially evaluated. 6002 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6003 return; 6004 } 6005 6006 // Note that this declaration has been used. 6007 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6008 unsigned TypeQuals; 6009 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6010 if (!Constructor->isUsed()) 6011 DefineImplicitDefaultConstructor(Loc, Constructor); 6012 } else if (Constructor->isImplicit() && 6013 Constructor->isCopyConstructor(Context, TypeQuals)) { 6014 if (!Constructor->isUsed()) 6015 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6016 } 6017 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6018 if (Destructor->isImplicit() && !Destructor->isUsed()) 6019 DefineImplicitDestructor(Loc, Destructor); 6020 6021 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6022 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6023 MethodDecl->getOverloadedOperator() == OO_Equal) { 6024 if (!MethodDecl->isUsed()) 6025 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6026 } 6027 } 6028 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6029 // Implicit instantiation of function templates and member functions of 6030 // class templates. 6031 if (!Function->getBody()) { 6032 // FIXME: distinguish between implicit instantiations of function 6033 // templates and explicit specializations (the latter don't get 6034 // instantiated, naturally). 6035 if (Function->getInstantiatedFromMemberFunction() || 6036 Function->getPrimaryTemplate()) 6037 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6038 } 6039 6040 6041 // FIXME: keep track of references to static functions 6042 Function->setUsed(true); 6043 return; 6044 } 6045 6046 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6047 // Implicit instantiation of static data members of class templates. 6048 // FIXME: distinguish between implicit instantiations (which we need to 6049 // actually instantiate) and explicit specializations. 6050 if (Var->isStaticDataMember() && 6051 Var->getInstantiatedFromStaticDataMember()) 6052 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6053 6054 // FIXME: keep track of references to static data? 6055 6056 D->setUsed(true); 6057 return; 6058} 6059} 6060 6061