SemaExpr.cpp revision 62e8676ce94d29cbb14b5f14321d4c75fe620caa
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/ExprCXX.h" 19#include "clang/AST/ExprObjC.h" 20#include "clang/Basic/PartialDiagnostic.h" 21#include "clang/Basic/SourceManager.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Lex/LiteralSupport.h" 24#include "clang/Lex/Preprocessor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Designator.h" 27#include "clang/Parse/Scope.h" 28using namespace clang; 29 30 31/// \brief Determine whether the use of this declaration is valid, and 32/// emit any corresponding diagnostics. 33/// 34/// This routine diagnoses various problems with referencing 35/// declarations that can occur when using a declaration. For example, 36/// it might warn if a deprecated or unavailable declaration is being 37/// used, or produce an error (and return true) if a C++0x deleted 38/// function is being used. 39/// 40/// \returns true if there was an error (this declaration cannot be 41/// referenced), false otherwise. 42bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 43 // See if the decl is deprecated. 44 if (D->getAttr<DeprecatedAttr>()) { 45 // Implementing deprecated stuff requires referencing deprecated 46 // stuff. Don't warn if we are implementing a deprecated 47 // construct. 48 bool isSilenced = false; 49 50 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 51 // If this reference happens *in* a deprecated function or method, don't 52 // warn. 53 isSilenced = ND->getAttr<DeprecatedAttr>(); 54 55 // If this is an Objective-C method implementation, check to see if the 56 // method was deprecated on the declaration, not the definition. 57 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 58 // The semantic decl context of a ObjCMethodDecl is the 59 // ObjCImplementationDecl. 60 if (ObjCImplementationDecl *Impl 61 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 62 63 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 64 MD->isInstanceMethod()); 65 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 66 } 67 } 68 } 69 70 if (!isSilenced) 71 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 72 } 73 74 // See if this is a deleted function. 75 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 76 if (FD->isDeleted()) { 77 Diag(Loc, diag::err_deleted_function_use); 78 Diag(D->getLocation(), diag::note_unavailable_here) << true; 79 return true; 80 } 81 } 82 83 // See if the decl is unavailable 84 if (D->getAttr<UnavailableAttr>()) { 85 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 86 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 87 } 88 89 return false; 90} 91 92/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 93/// (and other functions in future), which have been declared with sentinel 94/// attribute. It warns if call does not have the sentinel argument. 95/// 96void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 97 Expr **Args, unsigned NumArgs) { 98 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 99 if (!attr) 100 return; 101 int sentinelPos = attr->getSentinel(); 102 int nullPos = attr->getNullPos(); 103 104 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 105 // base class. Then we won't be needing two versions of the same code. 106 unsigned int i = 0; 107 bool warnNotEnoughArgs = false; 108 int isMethod = 0; 109 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 110 // skip over named parameters. 111 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 112 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 113 if (nullPos) 114 --nullPos; 115 else 116 ++i; 117 } 118 warnNotEnoughArgs = (P != E || i >= NumArgs); 119 isMethod = 1; 120 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 121 // skip over named parameters. 122 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 123 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 124 if (nullPos) 125 --nullPos; 126 else 127 ++i; 128 } 129 warnNotEnoughArgs = (P != E || i >= NumArgs); 130 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 131 // block or function pointer call. 132 QualType Ty = V->getType(); 133 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 134 const FunctionType *FT = Ty->isFunctionPointerType() 135 ? Ty->getAs<PointerType>()->getPointeeType()->getAsFunctionType() 136 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAsFunctionType(); 137 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 138 unsigned NumArgsInProto = Proto->getNumArgs(); 139 unsigned k; 140 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 141 if (nullPos) 142 --nullPos; 143 else 144 ++i; 145 } 146 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 147 } 148 if (Ty->isBlockPointerType()) 149 isMethod = 2; 150 } else 151 return; 152 } else 153 return; 154 155 if (warnNotEnoughArgs) { 156 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 157 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 158 return; 159 } 160 int sentinel = i; 161 while (sentinelPos > 0 && i < NumArgs-1) { 162 --sentinelPos; 163 ++i; 164 } 165 if (sentinelPos > 0) { 166 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 167 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 168 return; 169 } 170 while (i < NumArgs-1) { 171 ++i; 172 ++sentinel; 173 } 174 Expr *sentinelExpr = Args[sentinel]; 175 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 176 !sentinelExpr->isNullPointerConstant(Context))) { 177 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 178 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 179 } 180 return; 181} 182 183SourceRange Sema::getExprRange(ExprTy *E) const { 184 Expr *Ex = (Expr *)E; 185 return Ex? Ex->getSourceRange() : SourceRange(); 186} 187 188//===----------------------------------------------------------------------===// 189// Standard Promotions and Conversions 190//===----------------------------------------------------------------------===// 191 192/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 193void Sema::DefaultFunctionArrayConversion(Expr *&E) { 194 QualType Ty = E->getType(); 195 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 196 197 if (Ty->isFunctionType()) 198 ImpCastExprToType(E, Context.getPointerType(Ty), 199 CastExpr::CK_FunctionToPointerDecay); 200 else if (Ty->isArrayType()) { 201 // In C90 mode, arrays only promote to pointers if the array expression is 202 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 203 // type 'array of type' is converted to an expression that has type 'pointer 204 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 205 // that has type 'array of type' ...". The relevant change is "an lvalue" 206 // (C90) to "an expression" (C99). 207 // 208 // C++ 4.2p1: 209 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 210 // T" can be converted to an rvalue of type "pointer to T". 211 // 212 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 213 E->isLvalue(Context) == Expr::LV_Valid) 214 ImpCastExprToType(E, Context.getArrayDecayedType(Ty), 215 CastExpr::CK_ArrayToPointerDecay); 216 } 217} 218 219/// UsualUnaryConversions - Performs various conversions that are common to most 220/// operators (C99 6.3). The conversions of array and function types are 221/// sometimes surpressed. For example, the array->pointer conversion doesn't 222/// apply if the array is an argument to the sizeof or address (&) operators. 223/// In these instances, this routine should *not* be called. 224Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 225 QualType Ty = Expr->getType(); 226 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 227 228 // C99 6.3.1.1p2: 229 // 230 // The following may be used in an expression wherever an int or 231 // unsigned int may be used: 232 // - an object or expression with an integer type whose integer 233 // conversion rank is less than or equal to the rank of int 234 // and unsigned int. 235 // - A bit-field of type _Bool, int, signed int, or unsigned int. 236 // 237 // If an int can represent all values of the original type, the 238 // value is converted to an int; otherwise, it is converted to an 239 // unsigned int. These are called the integer promotions. All 240 // other types are unchanged by the integer promotions. 241 QualType PTy = Context.isPromotableBitField(Expr); 242 if (!PTy.isNull()) { 243 ImpCastExprToType(Expr, PTy); 244 return Expr; 245 } 246 if (Ty->isPromotableIntegerType()) { 247 QualType PT = Context.getPromotedIntegerType(Ty); 248 ImpCastExprToType(Expr, PT); 249 return Expr; 250 } 251 252 DefaultFunctionArrayConversion(Expr); 253 return Expr; 254} 255 256/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 257/// do not have a prototype. Arguments that have type float are promoted to 258/// double. All other argument types are converted by UsualUnaryConversions(). 259void Sema::DefaultArgumentPromotion(Expr *&Expr) { 260 QualType Ty = Expr->getType(); 261 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 262 263 // If this is a 'float' (CVR qualified or typedef) promote to double. 264 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 265 if (BT->getKind() == BuiltinType::Float) 266 return ImpCastExprToType(Expr, Context.DoubleTy); 267 268 UsualUnaryConversions(Expr); 269} 270 271/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 272/// will warn if the resulting type is not a POD type, and rejects ObjC 273/// interfaces passed by value. This returns true if the argument type is 274/// completely illegal. 275bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 276 DefaultArgumentPromotion(Expr); 277 278 if (Expr->getType()->isObjCInterfaceType()) { 279 Diag(Expr->getLocStart(), 280 diag::err_cannot_pass_objc_interface_to_vararg) 281 << Expr->getType() << CT; 282 return true; 283 } 284 285 if (!Expr->getType()->isPODType()) 286 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 287 << Expr->getType() << CT; 288 289 return false; 290} 291 292 293/// UsualArithmeticConversions - Performs various conversions that are common to 294/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 295/// routine returns the first non-arithmetic type found. The client is 296/// responsible for emitting appropriate error diagnostics. 297/// FIXME: verify the conversion rules for "complex int" are consistent with 298/// GCC. 299QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 300 bool isCompAssign) { 301 if (!isCompAssign) 302 UsualUnaryConversions(lhsExpr); 303 304 UsualUnaryConversions(rhsExpr); 305 306 // For conversion purposes, we ignore any qualifiers. 307 // For example, "const float" and "float" are equivalent. 308 QualType lhs = 309 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 310 QualType rhs = 311 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 312 313 // If both types are identical, no conversion is needed. 314 if (lhs == rhs) 315 return lhs; 316 317 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 318 // The caller can deal with this (e.g. pointer + int). 319 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 320 return lhs; 321 322 // Perform bitfield promotions. 323 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr); 324 if (!LHSBitfieldPromoteTy.isNull()) 325 lhs = LHSBitfieldPromoteTy; 326 QualType RHSBitfieldPromoteTy = Context.isPromotableBitField(rhsExpr); 327 if (!RHSBitfieldPromoteTy.isNull()) 328 rhs = RHSBitfieldPromoteTy; 329 330 QualType destType = Context.UsualArithmeticConversionsType(lhs, rhs); 331 if (!isCompAssign) 332 ImpCastExprToType(lhsExpr, destType); 333 ImpCastExprToType(rhsExpr, destType); 334 return destType; 335} 336 337//===----------------------------------------------------------------------===// 338// Semantic Analysis for various Expression Types 339//===----------------------------------------------------------------------===// 340 341 342/// ActOnStringLiteral - The specified tokens were lexed as pasted string 343/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 344/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 345/// multiple tokens. However, the common case is that StringToks points to one 346/// string. 347/// 348Action::OwningExprResult 349Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 350 assert(NumStringToks && "Must have at least one string!"); 351 352 StringLiteralParser Literal(StringToks, NumStringToks, PP); 353 if (Literal.hadError) 354 return ExprError(); 355 356 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 357 for (unsigned i = 0; i != NumStringToks; ++i) 358 StringTokLocs.push_back(StringToks[i].getLocation()); 359 360 QualType StrTy = Context.CharTy; 361 if (Literal.AnyWide) StrTy = Context.getWCharType(); 362 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 363 364 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 365 if (getLangOptions().CPlusPlus) 366 StrTy.addConst(); 367 368 // Get an array type for the string, according to C99 6.4.5. This includes 369 // the nul terminator character as well as the string length for pascal 370 // strings. 371 StrTy = Context.getConstantArrayType(StrTy, 372 llvm::APInt(32, Literal.GetNumStringChars()+1), 373 ArrayType::Normal, 0); 374 375 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 376 return Owned(StringLiteral::Create(Context, Literal.GetString(), 377 Literal.GetStringLength(), 378 Literal.AnyWide, StrTy, 379 &StringTokLocs[0], 380 StringTokLocs.size())); 381} 382 383/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 384/// CurBlock to VD should cause it to be snapshotted (as we do for auto 385/// variables defined outside the block) or false if this is not needed (e.g. 386/// for values inside the block or for globals). 387/// 388/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 389/// up-to-date. 390/// 391static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 392 ValueDecl *VD) { 393 // If the value is defined inside the block, we couldn't snapshot it even if 394 // we wanted to. 395 if (CurBlock->TheDecl == VD->getDeclContext()) 396 return false; 397 398 // If this is an enum constant or function, it is constant, don't snapshot. 399 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 400 return false; 401 402 // If this is a reference to an extern, static, or global variable, no need to 403 // snapshot it. 404 // FIXME: What about 'const' variables in C++? 405 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 406 if (!Var->hasLocalStorage()) 407 return false; 408 409 // Blocks that have these can't be constant. 410 CurBlock->hasBlockDeclRefExprs = true; 411 412 // If we have nested blocks, the decl may be declared in an outer block (in 413 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 414 // be defined outside all of the current blocks (in which case the blocks do 415 // all get the bit). Walk the nesting chain. 416 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 417 NextBlock = NextBlock->PrevBlockInfo) { 418 // If we found the defining block for the variable, don't mark the block as 419 // having a reference outside it. 420 if (NextBlock->TheDecl == VD->getDeclContext()) 421 break; 422 423 // Otherwise, the DeclRef from the inner block causes the outer one to need 424 // a snapshot as well. 425 NextBlock->hasBlockDeclRefExprs = true; 426 } 427 428 return true; 429} 430 431 432 433/// ActOnIdentifierExpr - The parser read an identifier in expression context, 434/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 435/// identifier is used in a function call context. 436/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 437/// class or namespace that the identifier must be a member of. 438Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 439 IdentifierInfo &II, 440 bool HasTrailingLParen, 441 const CXXScopeSpec *SS, 442 bool isAddressOfOperand) { 443 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 444 isAddressOfOperand); 445} 446 447/// BuildDeclRefExpr - Build either a DeclRefExpr or a 448/// QualifiedDeclRefExpr based on whether or not SS is a 449/// nested-name-specifier. 450Sema::OwningExprResult 451Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 452 bool TypeDependent, bool ValueDependent, 453 const CXXScopeSpec *SS) { 454 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 455 Diag(Loc, 456 diag::err_auto_variable_cannot_appear_in_own_initializer) 457 << D->getDeclName(); 458 return ExprError(); 459 } 460 461 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 462 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 463 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 464 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 465 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 466 << D->getIdentifier() << FD->getDeclName(); 467 Diag(D->getLocation(), diag::note_local_variable_declared_here) 468 << D->getIdentifier(); 469 return ExprError(); 470 } 471 } 472 } 473 } 474 475 MarkDeclarationReferenced(Loc, D); 476 477 Expr *E; 478 if (SS && !SS->isEmpty()) { 479 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 480 ValueDependent, SS->getRange(), 481 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 482 } else 483 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 484 485 return Owned(E); 486} 487 488/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 489/// variable corresponding to the anonymous union or struct whose type 490/// is Record. 491static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 492 RecordDecl *Record) { 493 assert(Record->isAnonymousStructOrUnion() && 494 "Record must be an anonymous struct or union!"); 495 496 // FIXME: Once Decls are directly linked together, this will be an O(1) 497 // operation rather than a slow walk through DeclContext's vector (which 498 // itself will be eliminated). DeclGroups might make this even better. 499 DeclContext *Ctx = Record->getDeclContext(); 500 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 501 DEnd = Ctx->decls_end(); 502 D != DEnd; ++D) { 503 if (*D == Record) { 504 // The object for the anonymous struct/union directly 505 // follows its type in the list of declarations. 506 ++D; 507 assert(D != DEnd && "Missing object for anonymous record"); 508 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 509 return *D; 510 } 511 } 512 513 assert(false && "Missing object for anonymous record"); 514 return 0; 515} 516 517/// \brief Given a field that represents a member of an anonymous 518/// struct/union, build the path from that field's context to the 519/// actual member. 520/// 521/// Construct the sequence of field member references we'll have to 522/// perform to get to the field in the anonymous union/struct. The 523/// list of members is built from the field outward, so traverse it 524/// backwards to go from an object in the current context to the field 525/// we found. 526/// 527/// \returns The variable from which the field access should begin, 528/// for an anonymous struct/union that is not a member of another 529/// class. Otherwise, returns NULL. 530VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 531 llvm::SmallVectorImpl<FieldDecl *> &Path) { 532 assert(Field->getDeclContext()->isRecord() && 533 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 534 && "Field must be stored inside an anonymous struct or union"); 535 536 Path.push_back(Field); 537 VarDecl *BaseObject = 0; 538 DeclContext *Ctx = Field->getDeclContext(); 539 do { 540 RecordDecl *Record = cast<RecordDecl>(Ctx); 541 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 542 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 543 Path.push_back(AnonField); 544 else { 545 BaseObject = cast<VarDecl>(AnonObject); 546 break; 547 } 548 Ctx = Ctx->getParent(); 549 } while (Ctx->isRecord() && 550 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 551 552 return BaseObject; 553} 554 555Sema::OwningExprResult 556Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 557 FieldDecl *Field, 558 Expr *BaseObjectExpr, 559 SourceLocation OpLoc) { 560 llvm::SmallVector<FieldDecl *, 4> AnonFields; 561 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 562 AnonFields); 563 564 // Build the expression that refers to the base object, from 565 // which we will build a sequence of member references to each 566 // of the anonymous union objects and, eventually, the field we 567 // found via name lookup. 568 bool BaseObjectIsPointer = false; 569 unsigned ExtraQuals = 0; 570 if (BaseObject) { 571 // BaseObject is an anonymous struct/union variable (and is, 572 // therefore, not part of another non-anonymous record). 573 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 574 MarkDeclarationReferenced(Loc, BaseObject); 575 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 576 SourceLocation()); 577 ExtraQuals 578 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 579 } else if (BaseObjectExpr) { 580 // The caller provided the base object expression. Determine 581 // whether its a pointer and whether it adds any qualifiers to the 582 // anonymous struct/union fields we're looking into. 583 QualType ObjectType = BaseObjectExpr->getType(); 584 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) { 585 BaseObjectIsPointer = true; 586 ObjectType = ObjectPtr->getPointeeType(); 587 } 588 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 589 } else { 590 // We've found a member of an anonymous struct/union that is 591 // inside a non-anonymous struct/union, so in a well-formed 592 // program our base object expression is "this". 593 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 594 if (!MD->isStatic()) { 595 QualType AnonFieldType 596 = Context.getTagDeclType( 597 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 598 QualType ThisType = Context.getTagDeclType(MD->getParent()); 599 if ((Context.getCanonicalType(AnonFieldType) 600 == Context.getCanonicalType(ThisType)) || 601 IsDerivedFrom(ThisType, AnonFieldType)) { 602 // Our base object expression is "this". 603 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 604 MD->getThisType(Context)); 605 BaseObjectIsPointer = true; 606 } 607 } else { 608 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 609 << Field->getDeclName()); 610 } 611 ExtraQuals = MD->getTypeQualifiers(); 612 } 613 614 if (!BaseObjectExpr) 615 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 616 << Field->getDeclName()); 617 } 618 619 // Build the implicit member references to the field of the 620 // anonymous struct/union. 621 Expr *Result = BaseObjectExpr; 622 unsigned BaseAddrSpace = BaseObjectExpr->getType().getAddressSpace(); 623 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 624 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 625 FI != FIEnd; ++FI) { 626 QualType MemberType = (*FI)->getType(); 627 if (!(*FI)->isMutable()) { 628 unsigned combinedQualifiers 629 = MemberType.getCVRQualifiers() | ExtraQuals; 630 MemberType = MemberType.getQualifiedType(combinedQualifiers); 631 } 632 if (BaseAddrSpace != MemberType.getAddressSpace()) 633 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 634 MarkDeclarationReferenced(Loc, *FI); 635 // FIXME: Might this end up being a qualified name? 636 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 637 OpLoc, MemberType); 638 BaseObjectIsPointer = false; 639 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 640 } 641 642 return Owned(Result); 643} 644 645/// ActOnDeclarationNameExpr - The parser has read some kind of name 646/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 647/// performs lookup on that name and returns an expression that refers 648/// to that name. This routine isn't directly called from the parser, 649/// because the parser doesn't know about DeclarationName. Rather, 650/// this routine is called by ActOnIdentifierExpr, 651/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 652/// which form the DeclarationName from the corresponding syntactic 653/// forms. 654/// 655/// HasTrailingLParen indicates whether this identifier is used in a 656/// function call context. LookupCtx is only used for a C++ 657/// qualified-id (foo::bar) to indicate the class or namespace that 658/// the identifier must be a member of. 659/// 660/// isAddressOfOperand means that this expression is the direct operand 661/// of an address-of operator. This matters because this is the only 662/// situation where a qualified name referencing a non-static member may 663/// appear outside a member function of this class. 664Sema::OwningExprResult 665Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 666 DeclarationName Name, bool HasTrailingLParen, 667 const CXXScopeSpec *SS, 668 bool isAddressOfOperand) { 669 // Could be enum-constant, value decl, instance variable, etc. 670 if (SS && SS->isInvalid()) 671 return ExprError(); 672 673 // C++ [temp.dep.expr]p3: 674 // An id-expression is type-dependent if it contains: 675 // -- a nested-name-specifier that contains a class-name that 676 // names a dependent type. 677 // FIXME: Member of the current instantiation. 678 if (SS && isDependentScopeSpecifier(*SS)) { 679 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 680 Loc, SS->getRange(), 681 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 682 isAddressOfOperand)); 683 } 684 685 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 686 false, true, Loc); 687 688 if (Lookup.isAmbiguous()) { 689 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 690 SS && SS->isSet() ? SS->getRange() 691 : SourceRange()); 692 return ExprError(); 693 } 694 695 NamedDecl *D = Lookup.getAsDecl(); 696 697 // If this reference is in an Objective-C method, then ivar lookup happens as 698 // well. 699 IdentifierInfo *II = Name.getAsIdentifierInfo(); 700 if (II && getCurMethodDecl()) { 701 // There are two cases to handle here. 1) scoped lookup could have failed, 702 // in which case we should look for an ivar. 2) scoped lookup could have 703 // found a decl, but that decl is outside the current instance method (i.e. 704 // a global variable). In these two cases, we do a lookup for an ivar with 705 // this name, if the lookup sucedes, we replace it our current decl. 706 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 707 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 708 ObjCInterfaceDecl *ClassDeclared; 709 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 710 // Check if referencing a field with __attribute__((deprecated)). 711 if (DiagnoseUseOfDecl(IV, Loc)) 712 return ExprError(); 713 714 // If we're referencing an invalid decl, just return this as a silent 715 // error node. The error diagnostic was already emitted on the decl. 716 if (IV->isInvalidDecl()) 717 return ExprError(); 718 719 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 720 // If a class method attemps to use a free standing ivar, this is 721 // an error. 722 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 723 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 724 << IV->getDeclName()); 725 // If a class method uses a global variable, even if an ivar with 726 // same name exists, use the global. 727 if (!IsClsMethod) { 728 if (IV->getAccessControl() == ObjCIvarDecl::Private && 729 ClassDeclared != IFace) 730 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 731 // FIXME: This should use a new expr for a direct reference, don't 732 // turn this into Self->ivar, just return a BareIVarExpr or something. 733 IdentifierInfo &II = Context.Idents.get("self"); 734 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 735 II, false); 736 MarkDeclarationReferenced(Loc, IV); 737 return Owned(new (Context) 738 ObjCIvarRefExpr(IV, IV->getType(), Loc, 739 SelfExpr.takeAs<Expr>(), true, true)); 740 } 741 } 742 } else if (getCurMethodDecl()->isInstanceMethod()) { 743 // We should warn if a local variable hides an ivar. 744 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 745 ObjCInterfaceDecl *ClassDeclared; 746 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 747 if (IV->getAccessControl() != ObjCIvarDecl::Private || 748 IFace == ClassDeclared) 749 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 750 } 751 } 752 // Needed to implement property "super.method" notation. 753 if (D == 0 && II->isStr("super")) { 754 QualType T; 755 756 if (getCurMethodDecl()->isInstanceMethod()) 757 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 758 getCurMethodDecl()->getClassInterface())); 759 else 760 T = Context.getObjCClassType(); 761 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 762 } 763 } 764 765 // Determine whether this name might be a candidate for 766 // argument-dependent lookup. 767 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 768 HasTrailingLParen; 769 770 if (ADL && D == 0) { 771 // We've seen something of the form 772 // 773 // identifier( 774 // 775 // and we did not find any entity by the name 776 // "identifier". However, this identifier is still subject to 777 // argument-dependent lookup, so keep track of the name. 778 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 779 Context.OverloadTy, 780 Loc)); 781 } 782 783 if (D == 0) { 784 // Otherwise, this could be an implicitly declared function reference (legal 785 // in C90, extension in C99). 786 if (HasTrailingLParen && II && 787 !getLangOptions().CPlusPlus) // Not in C++. 788 D = ImplicitlyDefineFunction(Loc, *II, S); 789 else { 790 // If this name wasn't predeclared and if this is not a function call, 791 // diagnose the problem. 792 if (SS && !SS->isEmpty()) { 793 DiagnoseMissingMember(Loc, Name, 794 (NestedNameSpecifier *)SS->getScopeRep(), 795 SS->getRange()); 796 return ExprError(); 797 } else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 798 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 799 return ExprError(Diag(Loc, diag::err_undeclared_use) 800 << Name.getAsString()); 801 else 802 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 803 } 804 } 805 806 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 807 // Warn about constructs like: 808 // if (void *X = foo()) { ... } else { X }. 809 // In the else block, the pointer is always false. 810 811 // FIXME: In a template instantiation, we don't have scope 812 // information to check this property. 813 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 814 Scope *CheckS = S; 815 while (CheckS) { 816 if (CheckS->isWithinElse() && 817 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 818 if (Var->getType()->isBooleanType()) 819 ExprError(Diag(Loc, diag::warn_value_always_false) 820 << Var->getDeclName()); 821 else 822 ExprError(Diag(Loc, diag::warn_value_always_zero) 823 << Var->getDeclName()); 824 break; 825 } 826 827 // Move up one more control parent to check again. 828 CheckS = CheckS->getControlParent(); 829 if (CheckS) 830 CheckS = CheckS->getParent(); 831 } 832 } 833 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 834 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 835 // C99 DR 316 says that, if a function type comes from a 836 // function definition (without a prototype), that type is only 837 // used for checking compatibility. Therefore, when referencing 838 // the function, we pretend that we don't have the full function 839 // type. 840 if (DiagnoseUseOfDecl(Func, Loc)) 841 return ExprError(); 842 843 QualType T = Func->getType(); 844 QualType NoProtoType = T; 845 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 846 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 847 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 848 } 849 } 850 851 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 852} 853/// \brief Cast member's object to its own class if necessary. 854bool 855Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 856 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 857 if (CXXRecordDecl *RD = 858 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 859 QualType DestType = 860 Context.getCanonicalType(Context.getTypeDeclType(RD)); 861 if (DestType->isDependentType() || From->getType()->isDependentType()) 862 return false; 863 QualType FromRecordType = From->getType(); 864 QualType DestRecordType = DestType; 865 if (FromRecordType->getAs<PointerType>()) { 866 DestType = Context.getPointerType(DestType); 867 FromRecordType = FromRecordType->getPointeeType(); 868 } 869 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 870 CheckDerivedToBaseConversion(FromRecordType, 871 DestRecordType, 872 From->getSourceRange().getBegin(), 873 From->getSourceRange())) 874 return true; 875 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 876 /*isLvalue=*/true); 877 } 878 return false; 879} 880 881/// \brief Build a MemberExpr AST node. 882static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, 883 const CXXScopeSpec *SS, NamedDecl *Member, 884 SourceLocation Loc, QualType Ty) { 885 if (SS && SS->isSet()) 886 return MemberExpr::Create(C, Base, isArrow, 887 (NestedNameSpecifier *)SS->getScopeRep(), 888 SS->getRange(), Member, Loc, 889 // FIXME: Explicit template argument lists 890 false, SourceLocation(), 0, 0, SourceLocation(), 891 Ty); 892 893 return new (C) MemberExpr(Base, isArrow, Member, Loc, Ty); 894} 895 896/// \brief Complete semantic analysis for a reference to the given declaration. 897Sema::OwningExprResult 898Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 899 bool HasTrailingLParen, 900 const CXXScopeSpec *SS, 901 bool isAddressOfOperand) { 902 assert(D && "Cannot refer to a NULL declaration"); 903 DeclarationName Name = D->getDeclName(); 904 905 // If this is an expression of the form &Class::member, don't build an 906 // implicit member ref, because we want a pointer to the member in general, 907 // not any specific instance's member. 908 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 909 DeclContext *DC = computeDeclContext(*SS); 910 if (D && isa<CXXRecordDecl>(DC)) { 911 QualType DType; 912 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 913 DType = FD->getType().getNonReferenceType(); 914 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 915 DType = Method->getType(); 916 } else if (isa<OverloadedFunctionDecl>(D)) { 917 DType = Context.OverloadTy; 918 } 919 // Could be an inner type. That's diagnosed below, so ignore it here. 920 if (!DType.isNull()) { 921 // The pointer is type- and value-dependent if it points into something 922 // dependent. 923 bool Dependent = DC->isDependentContext(); 924 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 925 } 926 } 927 } 928 929 // We may have found a field within an anonymous union or struct 930 // (C++ [class.union]). 931 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 932 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 933 return BuildAnonymousStructUnionMemberReference(Loc, FD); 934 935 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 936 if (!MD->isStatic()) { 937 // C++ [class.mfct.nonstatic]p2: 938 // [...] if name lookup (3.4.1) resolves the name in the 939 // id-expression to a nonstatic nontype member of class X or of 940 // a base class of X, the id-expression is transformed into a 941 // class member access expression (5.2.5) using (*this) (9.3.2) 942 // as the postfix-expression to the left of the '.' operator. 943 DeclContext *Ctx = 0; 944 QualType MemberType; 945 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 946 Ctx = FD->getDeclContext(); 947 MemberType = FD->getType(); 948 949 if (const ReferenceType *RefType = MemberType->getAs<ReferenceType>()) 950 MemberType = RefType->getPointeeType(); 951 else if (!FD->isMutable()) { 952 unsigned combinedQualifiers 953 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 954 MemberType = MemberType.getQualifiedType(combinedQualifiers); 955 } 956 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 957 if (!Method->isStatic()) { 958 Ctx = Method->getParent(); 959 MemberType = Method->getType(); 960 } 961 } else if (FunctionTemplateDecl *FunTmpl 962 = dyn_cast<FunctionTemplateDecl>(D)) { 963 if (CXXMethodDecl *Method 964 = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())) { 965 if (!Method->isStatic()) { 966 Ctx = Method->getParent(); 967 MemberType = Context.OverloadTy; 968 } 969 } 970 } else if (OverloadedFunctionDecl *Ovl 971 = dyn_cast<OverloadedFunctionDecl>(D)) { 972 // FIXME: We need an abstraction for iterating over one or more function 973 // templates or functions. This code is far too repetitive! 974 for (OverloadedFunctionDecl::function_iterator 975 Func = Ovl->function_begin(), 976 FuncEnd = Ovl->function_end(); 977 Func != FuncEnd; ++Func) { 978 CXXMethodDecl *DMethod = 0; 979 if (FunctionTemplateDecl *FunTmpl 980 = dyn_cast<FunctionTemplateDecl>(*Func)) 981 DMethod = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); 982 else 983 DMethod = dyn_cast<CXXMethodDecl>(*Func); 984 985 if (DMethod && !DMethod->isStatic()) { 986 Ctx = DMethod->getDeclContext(); 987 MemberType = Context.OverloadTy; 988 break; 989 } 990 } 991 } 992 993 if (Ctx && Ctx->isRecord()) { 994 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 995 QualType ThisType = Context.getTagDeclType(MD->getParent()); 996 if ((Context.getCanonicalType(CtxType) 997 == Context.getCanonicalType(ThisType)) || 998 IsDerivedFrom(ThisType, CtxType)) { 999 // Build the implicit member access expression. 1000 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1001 MD->getThisType(Context)); 1002 MarkDeclarationReferenced(Loc, D); 1003 if (PerformObjectMemberConversion(This, D)) 1004 return ExprError(); 1005 1006 bool ShouldCheckUse = true; 1007 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 1008 // Don't diagnose the use of a virtual member function unless it's 1009 // explicitly qualified. 1010 if (MD->isVirtual() && (!SS || !SS->isSet())) 1011 ShouldCheckUse = false; 1012 } 1013 1014 if (ShouldCheckUse && DiagnoseUseOfDecl(D, Loc)) 1015 return ExprError(); 1016 return Owned(BuildMemberExpr(Context, This, true, SS, D, 1017 Loc, MemberType)); 1018 } 1019 } 1020 } 1021 } 1022 1023 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1024 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1025 if (MD->isStatic()) 1026 // "invalid use of member 'x' in static member function" 1027 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1028 << FD->getDeclName()); 1029 } 1030 1031 // Any other ways we could have found the field in a well-formed 1032 // program would have been turned into implicit member expressions 1033 // above. 1034 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1035 << FD->getDeclName()); 1036 } 1037 1038 if (isa<TypedefDecl>(D)) 1039 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1040 if (isa<ObjCInterfaceDecl>(D)) 1041 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1042 if (isa<NamespaceDecl>(D)) 1043 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1044 1045 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1046 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1047 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1048 false, false, SS); 1049 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1050 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1051 false, false, SS); 1052 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 1053 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 1054 /*TypeDependent=*/true, 1055 /*ValueDependent=*/true, SS); 1056 1057 ValueDecl *VD = cast<ValueDecl>(D); 1058 1059 // Check whether this declaration can be used. Note that we suppress 1060 // this check when we're going to perform argument-dependent lookup 1061 // on this function name, because this might not be the function 1062 // that overload resolution actually selects. 1063 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1064 HasTrailingLParen; 1065 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1066 return ExprError(); 1067 1068 // Only create DeclRefExpr's for valid Decl's. 1069 if (VD->isInvalidDecl()) 1070 return ExprError(); 1071 1072 // If the identifier reference is inside a block, and it refers to a value 1073 // that is outside the block, create a BlockDeclRefExpr instead of a 1074 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1075 // the block is formed. 1076 // 1077 // We do not do this for things like enum constants, global variables, etc, 1078 // as they do not get snapshotted. 1079 // 1080 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1081 MarkDeclarationReferenced(Loc, VD); 1082 QualType ExprTy = VD->getType().getNonReferenceType(); 1083 // The BlocksAttr indicates the variable is bound by-reference. 1084 if (VD->getAttr<BlocksAttr>()) 1085 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1086 // This is to record that a 'const' was actually synthesize and added. 1087 bool constAdded = !ExprTy.isConstQualified(); 1088 // Variable will be bound by-copy, make it const within the closure. 1089 1090 ExprTy.addConst(); 1091 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1092 constAdded)); 1093 } 1094 // If this reference is not in a block or if the referenced variable is 1095 // within the block, create a normal DeclRefExpr. 1096 1097 bool TypeDependent = false; 1098 bool ValueDependent = false; 1099 if (getLangOptions().CPlusPlus) { 1100 // C++ [temp.dep.expr]p3: 1101 // An id-expression is type-dependent if it contains: 1102 // - an identifier that was declared with a dependent type, 1103 if (VD->getType()->isDependentType()) 1104 TypeDependent = true; 1105 // - FIXME: a template-id that is dependent, 1106 // - a conversion-function-id that specifies a dependent type, 1107 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1108 Name.getCXXNameType()->isDependentType()) 1109 TypeDependent = true; 1110 // - a nested-name-specifier that contains a class-name that 1111 // names a dependent type. 1112 else if (SS && !SS->isEmpty()) { 1113 for (DeclContext *DC = computeDeclContext(*SS); 1114 DC; DC = DC->getParent()) { 1115 // FIXME: could stop early at namespace scope. 1116 if (DC->isRecord()) { 1117 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1118 if (Context.getTypeDeclType(Record)->isDependentType()) { 1119 TypeDependent = true; 1120 break; 1121 } 1122 } 1123 } 1124 } 1125 1126 // C++ [temp.dep.constexpr]p2: 1127 // 1128 // An identifier is value-dependent if it is: 1129 // - a name declared with a dependent type, 1130 if (TypeDependent) 1131 ValueDependent = true; 1132 // - the name of a non-type template parameter, 1133 else if (isa<NonTypeTemplateParmDecl>(VD)) 1134 ValueDependent = true; 1135 // - a constant with integral or enumeration type and is 1136 // initialized with an expression that is value-dependent 1137 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1138 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1139 Dcl->getInit()) { 1140 ValueDependent = Dcl->getInit()->isValueDependent(); 1141 } 1142 } 1143 } 1144 1145 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1146 TypeDependent, ValueDependent, SS); 1147} 1148 1149Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1150 tok::TokenKind Kind) { 1151 PredefinedExpr::IdentType IT; 1152 1153 switch (Kind) { 1154 default: assert(0 && "Unknown simple primary expr!"); 1155 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1156 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1157 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1158 } 1159 1160 // Pre-defined identifiers are of type char[x], where x is the length of the 1161 // string. 1162 1163 Decl *currentDecl = getCurFunctionOrMethodDecl(); 1164 if (!currentDecl) { 1165 Diag(Loc, diag::ext_predef_outside_function); 1166 currentDecl = Context.getTranslationUnitDecl(); 1167 } 1168 1169 QualType ResTy; 1170 if (cast<DeclContext>(currentDecl)->isDependentContext()) { 1171 ResTy = Context.DependentTy; 1172 } else { 1173 unsigned Length = 1174 PredefinedExpr::ComputeName(Context, IT, currentDecl).length(); 1175 1176 llvm::APInt LengthI(32, Length + 1); 1177 ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1178 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1179 } 1180 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1181} 1182 1183Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1184 llvm::SmallString<16> CharBuffer; 1185 CharBuffer.resize(Tok.getLength()); 1186 const char *ThisTokBegin = &CharBuffer[0]; 1187 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1188 1189 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1190 Tok.getLocation(), PP); 1191 if (Literal.hadError()) 1192 return ExprError(); 1193 1194 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1195 1196 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1197 Literal.isWide(), 1198 type, Tok.getLocation())); 1199} 1200 1201Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1202 // Fast path for a single digit (which is quite common). A single digit 1203 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1204 if (Tok.getLength() == 1) { 1205 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1206 unsigned IntSize = Context.Target.getIntWidth(); 1207 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1208 Context.IntTy, Tok.getLocation())); 1209 } 1210 1211 llvm::SmallString<512> IntegerBuffer; 1212 // Add padding so that NumericLiteralParser can overread by one character. 1213 IntegerBuffer.resize(Tok.getLength()+1); 1214 const char *ThisTokBegin = &IntegerBuffer[0]; 1215 1216 // Get the spelling of the token, which eliminates trigraphs, etc. 1217 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1218 1219 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1220 Tok.getLocation(), PP); 1221 if (Literal.hadError) 1222 return ExprError(); 1223 1224 Expr *Res; 1225 1226 if (Literal.isFloatingLiteral()) { 1227 QualType Ty; 1228 if (Literal.isFloat) 1229 Ty = Context.FloatTy; 1230 else if (!Literal.isLong) 1231 Ty = Context.DoubleTy; 1232 else 1233 Ty = Context.LongDoubleTy; 1234 1235 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1236 1237 // isExact will be set by GetFloatValue(). 1238 bool isExact = false; 1239 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1240 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1241 1242 } else if (!Literal.isIntegerLiteral()) { 1243 return ExprError(); 1244 } else { 1245 QualType Ty; 1246 1247 // long long is a C99 feature. 1248 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1249 Literal.isLongLong) 1250 Diag(Tok.getLocation(), diag::ext_longlong); 1251 1252 // Get the value in the widest-possible width. 1253 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1254 1255 if (Literal.GetIntegerValue(ResultVal)) { 1256 // If this value didn't fit into uintmax_t, warn and force to ull. 1257 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1258 Ty = Context.UnsignedLongLongTy; 1259 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1260 "long long is not intmax_t?"); 1261 } else { 1262 // If this value fits into a ULL, try to figure out what else it fits into 1263 // according to the rules of C99 6.4.4.1p5. 1264 1265 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1266 // be an unsigned int. 1267 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1268 1269 // Check from smallest to largest, picking the smallest type we can. 1270 unsigned Width = 0; 1271 if (!Literal.isLong && !Literal.isLongLong) { 1272 // Are int/unsigned possibilities? 1273 unsigned IntSize = Context.Target.getIntWidth(); 1274 1275 // Does it fit in a unsigned int? 1276 if (ResultVal.isIntN(IntSize)) { 1277 // Does it fit in a signed int? 1278 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1279 Ty = Context.IntTy; 1280 else if (AllowUnsigned) 1281 Ty = Context.UnsignedIntTy; 1282 Width = IntSize; 1283 } 1284 } 1285 1286 // Are long/unsigned long possibilities? 1287 if (Ty.isNull() && !Literal.isLongLong) { 1288 unsigned LongSize = Context.Target.getLongWidth(); 1289 1290 // Does it fit in a unsigned long? 1291 if (ResultVal.isIntN(LongSize)) { 1292 // Does it fit in a signed long? 1293 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1294 Ty = Context.LongTy; 1295 else if (AllowUnsigned) 1296 Ty = Context.UnsignedLongTy; 1297 Width = LongSize; 1298 } 1299 } 1300 1301 // Finally, check long long if needed. 1302 if (Ty.isNull()) { 1303 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1304 1305 // Does it fit in a unsigned long long? 1306 if (ResultVal.isIntN(LongLongSize)) { 1307 // Does it fit in a signed long long? 1308 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1309 Ty = Context.LongLongTy; 1310 else if (AllowUnsigned) 1311 Ty = Context.UnsignedLongLongTy; 1312 Width = LongLongSize; 1313 } 1314 } 1315 1316 // If we still couldn't decide a type, we probably have something that 1317 // does not fit in a signed long long, but has no U suffix. 1318 if (Ty.isNull()) { 1319 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1320 Ty = Context.UnsignedLongLongTy; 1321 Width = Context.Target.getLongLongWidth(); 1322 } 1323 1324 if (ResultVal.getBitWidth() != Width) 1325 ResultVal.trunc(Width); 1326 } 1327 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1328 } 1329 1330 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1331 if (Literal.isImaginary) 1332 Res = new (Context) ImaginaryLiteral(Res, 1333 Context.getComplexType(Res->getType())); 1334 1335 return Owned(Res); 1336} 1337 1338Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1339 SourceLocation R, ExprArg Val) { 1340 Expr *E = Val.takeAs<Expr>(); 1341 assert((E != 0) && "ActOnParenExpr() missing expr"); 1342 return Owned(new (Context) ParenExpr(L, R, E)); 1343} 1344 1345/// The UsualUnaryConversions() function is *not* called by this routine. 1346/// See C99 6.3.2.1p[2-4] for more details. 1347bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1348 SourceLocation OpLoc, 1349 const SourceRange &ExprRange, 1350 bool isSizeof) { 1351 if (exprType->isDependentType()) 1352 return false; 1353 1354 // C99 6.5.3.4p1: 1355 if (isa<FunctionType>(exprType)) { 1356 // alignof(function) is allowed as an extension. 1357 if (isSizeof) 1358 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1359 return false; 1360 } 1361 1362 // Allow sizeof(void)/alignof(void) as an extension. 1363 if (exprType->isVoidType()) { 1364 Diag(OpLoc, diag::ext_sizeof_void_type) 1365 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1366 return false; 1367 } 1368 1369 if (RequireCompleteType(OpLoc, exprType, 1370 isSizeof ? diag::err_sizeof_incomplete_type : 1371 PDiag(diag::err_alignof_incomplete_type) 1372 << ExprRange)) 1373 return true; 1374 1375 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1376 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1377 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1378 << exprType << isSizeof << ExprRange; 1379 return true; 1380 } 1381 1382 return false; 1383} 1384 1385bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1386 const SourceRange &ExprRange) { 1387 E = E->IgnoreParens(); 1388 1389 // alignof decl is always ok. 1390 if (isa<DeclRefExpr>(E)) 1391 return false; 1392 1393 // Cannot know anything else if the expression is dependent. 1394 if (E->isTypeDependent()) 1395 return false; 1396 1397 if (E->getBitField()) { 1398 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1399 return true; 1400 } 1401 1402 // Alignment of a field access is always okay, so long as it isn't a 1403 // bit-field. 1404 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1405 if (isa<FieldDecl>(ME->getMemberDecl())) 1406 return false; 1407 1408 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1409} 1410 1411/// \brief Build a sizeof or alignof expression given a type operand. 1412Action::OwningExprResult 1413Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1414 bool isSizeOf, SourceRange R) { 1415 if (T.isNull()) 1416 return ExprError(); 1417 1418 if (!T->isDependentType() && 1419 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1420 return ExprError(); 1421 1422 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1423 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1424 Context.getSizeType(), OpLoc, 1425 R.getEnd())); 1426} 1427 1428/// \brief Build a sizeof or alignof expression given an expression 1429/// operand. 1430Action::OwningExprResult 1431Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1432 bool isSizeOf, SourceRange R) { 1433 // Verify that the operand is valid. 1434 bool isInvalid = false; 1435 if (E->isTypeDependent()) { 1436 // Delay type-checking for type-dependent expressions. 1437 } else if (!isSizeOf) { 1438 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1439 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1440 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1441 isInvalid = true; 1442 } else { 1443 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1444 } 1445 1446 if (isInvalid) 1447 return ExprError(); 1448 1449 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1450 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1451 Context.getSizeType(), OpLoc, 1452 R.getEnd())); 1453} 1454 1455/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1456/// the same for @c alignof and @c __alignof 1457/// Note that the ArgRange is invalid if isType is false. 1458Action::OwningExprResult 1459Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1460 void *TyOrEx, const SourceRange &ArgRange) { 1461 // If error parsing type, ignore. 1462 if (TyOrEx == 0) return ExprError(); 1463 1464 if (isType) { 1465 // FIXME: Preserve type source info. 1466 QualType ArgTy = GetTypeFromParser(TyOrEx); 1467 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1468 } 1469 1470 // Get the end location. 1471 Expr *ArgEx = (Expr *)TyOrEx; 1472 Action::OwningExprResult Result 1473 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1474 1475 if (Result.isInvalid()) 1476 DeleteExpr(ArgEx); 1477 1478 return move(Result); 1479} 1480 1481QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1482 if (V->isTypeDependent()) 1483 return Context.DependentTy; 1484 1485 // These operators return the element type of a complex type. 1486 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1487 return CT->getElementType(); 1488 1489 // Otherwise they pass through real integer and floating point types here. 1490 if (V->getType()->isArithmeticType()) 1491 return V->getType(); 1492 1493 // Reject anything else. 1494 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1495 << (isReal ? "__real" : "__imag"); 1496 return QualType(); 1497} 1498 1499 1500 1501Action::OwningExprResult 1502Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1503 tok::TokenKind Kind, ExprArg Input) { 1504 // Since this might be a postfix expression, get rid of ParenListExprs. 1505 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1506 Expr *Arg = (Expr *)Input.get(); 1507 1508 UnaryOperator::Opcode Opc; 1509 switch (Kind) { 1510 default: assert(0 && "Unknown unary op!"); 1511 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1512 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1513 } 1514 1515 if (getLangOptions().CPlusPlus && 1516 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1517 // Which overloaded operator? 1518 OverloadedOperatorKind OverOp = 1519 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1520 1521 // C++ [over.inc]p1: 1522 // 1523 // [...] If the function is a member function with one 1524 // parameter (which shall be of type int) or a non-member 1525 // function with two parameters (the second of which shall be 1526 // of type int), it defines the postfix increment operator ++ 1527 // for objects of that type. When the postfix increment is 1528 // called as a result of using the ++ operator, the int 1529 // argument will have value zero. 1530 Expr *Args[2] = { 1531 Arg, 1532 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1533 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1534 }; 1535 1536 // Build the candidate set for overloading 1537 OverloadCandidateSet CandidateSet; 1538 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1539 1540 // Perform overload resolution. 1541 OverloadCandidateSet::iterator Best; 1542 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1543 case OR_Success: { 1544 // We found a built-in operator or an overloaded operator. 1545 FunctionDecl *FnDecl = Best->Function; 1546 1547 if (FnDecl) { 1548 // We matched an overloaded operator. Build a call to that 1549 // operator. 1550 1551 // Convert the arguments. 1552 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1553 if (PerformObjectArgumentInitialization(Arg, Method)) 1554 return ExprError(); 1555 } else { 1556 // Convert the arguments. 1557 if (PerformCopyInitialization(Arg, 1558 FnDecl->getParamDecl(0)->getType(), 1559 "passing")) 1560 return ExprError(); 1561 } 1562 1563 // Determine the result type 1564 QualType ResultTy 1565 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1566 ResultTy = ResultTy.getNonReferenceType(); 1567 1568 // Build the actual expression node. 1569 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1570 SourceLocation()); 1571 UsualUnaryConversions(FnExpr); 1572 1573 Input.release(); 1574 Args[0] = Arg; 1575 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1576 Args, 2, ResultTy, 1577 OpLoc)); 1578 } else { 1579 // We matched a built-in operator. Convert the arguments, then 1580 // break out so that we will build the appropriate built-in 1581 // operator node. 1582 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1583 "passing")) 1584 return ExprError(); 1585 1586 break; 1587 } 1588 } 1589 1590 case OR_No_Viable_Function: 1591 // No viable function; fall through to handling this as a 1592 // built-in operator, which will produce an error message for us. 1593 break; 1594 1595 case OR_Ambiguous: 1596 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1597 << UnaryOperator::getOpcodeStr(Opc) 1598 << Arg->getSourceRange(); 1599 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1600 return ExprError(); 1601 1602 case OR_Deleted: 1603 Diag(OpLoc, diag::err_ovl_deleted_oper) 1604 << Best->Function->isDeleted() 1605 << UnaryOperator::getOpcodeStr(Opc) 1606 << Arg->getSourceRange(); 1607 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1608 return ExprError(); 1609 } 1610 1611 // Either we found no viable overloaded operator or we matched a 1612 // built-in operator. In either case, fall through to trying to 1613 // build a built-in operation. 1614 } 1615 1616 Input.release(); 1617 Input = Arg; 1618 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1619} 1620 1621Action::OwningExprResult 1622Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1623 ExprArg Idx, SourceLocation RLoc) { 1624 // Since this might be a postfix expression, get rid of ParenListExprs. 1625 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1626 1627 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1628 *RHSExp = static_cast<Expr*>(Idx.get()); 1629 1630 if (getLangOptions().CPlusPlus && 1631 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1632 Base.release(); 1633 Idx.release(); 1634 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1635 Context.DependentTy, RLoc)); 1636 } 1637 1638 if (getLangOptions().CPlusPlus && 1639 (LHSExp->getType()->isRecordType() || 1640 LHSExp->getType()->isEnumeralType() || 1641 RHSExp->getType()->isRecordType() || 1642 RHSExp->getType()->isEnumeralType())) { 1643 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1644 // to the candidate set. 1645 OverloadCandidateSet CandidateSet; 1646 Expr *Args[2] = { LHSExp, RHSExp }; 1647 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1648 SourceRange(LLoc, RLoc)); 1649 1650 // Perform overload resolution. 1651 OverloadCandidateSet::iterator Best; 1652 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1653 case OR_Success: { 1654 // We found a built-in operator or an overloaded operator. 1655 FunctionDecl *FnDecl = Best->Function; 1656 1657 if (FnDecl) { 1658 // We matched an overloaded operator. Build a call to that 1659 // operator. 1660 1661 // Convert the arguments. 1662 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1663 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1664 PerformCopyInitialization(RHSExp, 1665 FnDecl->getParamDecl(0)->getType(), 1666 "passing")) 1667 return ExprError(); 1668 } else { 1669 // Convert the arguments. 1670 if (PerformCopyInitialization(LHSExp, 1671 FnDecl->getParamDecl(0)->getType(), 1672 "passing") || 1673 PerformCopyInitialization(RHSExp, 1674 FnDecl->getParamDecl(1)->getType(), 1675 "passing")) 1676 return ExprError(); 1677 } 1678 1679 // Determine the result type 1680 QualType ResultTy 1681 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1682 ResultTy = ResultTy.getNonReferenceType(); 1683 1684 // Build the actual expression node. 1685 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1686 SourceLocation()); 1687 UsualUnaryConversions(FnExpr); 1688 1689 Base.release(); 1690 Idx.release(); 1691 Args[0] = LHSExp; 1692 Args[1] = RHSExp; 1693 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1694 FnExpr, Args, 2, 1695 ResultTy, LLoc)); 1696 } else { 1697 // We matched a built-in operator. Convert the arguments, then 1698 // break out so that we will build the appropriate built-in 1699 // operator node. 1700 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1701 "passing") || 1702 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1703 "passing")) 1704 return ExprError(); 1705 1706 break; 1707 } 1708 } 1709 1710 case OR_No_Viable_Function: 1711 // No viable function; fall through to handling this as a 1712 // built-in operator, which will produce an error message for us. 1713 break; 1714 1715 case OR_Ambiguous: 1716 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1717 << "[]" 1718 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1719 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1720 return ExprError(); 1721 1722 case OR_Deleted: 1723 Diag(LLoc, diag::err_ovl_deleted_oper) 1724 << Best->Function->isDeleted() 1725 << "[]" 1726 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1727 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1728 return ExprError(); 1729 } 1730 1731 // Either we found no viable overloaded operator or we matched a 1732 // built-in operator. In either case, fall through to trying to 1733 // build a built-in operation. 1734 } 1735 1736 // Perform default conversions. 1737 DefaultFunctionArrayConversion(LHSExp); 1738 DefaultFunctionArrayConversion(RHSExp); 1739 1740 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1741 1742 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1743 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1744 // in the subscript position. As a result, we need to derive the array base 1745 // and index from the expression types. 1746 Expr *BaseExpr, *IndexExpr; 1747 QualType ResultType; 1748 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1749 BaseExpr = LHSExp; 1750 IndexExpr = RHSExp; 1751 ResultType = Context.DependentTy; 1752 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1753 BaseExpr = LHSExp; 1754 IndexExpr = RHSExp; 1755 ResultType = PTy->getPointeeType(); 1756 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1757 // Handle the uncommon case of "123[Ptr]". 1758 BaseExpr = RHSExp; 1759 IndexExpr = LHSExp; 1760 ResultType = PTy->getPointeeType(); 1761 } else if (const ObjCObjectPointerType *PTy = 1762 LHSTy->getAsObjCObjectPointerType()) { 1763 BaseExpr = LHSExp; 1764 IndexExpr = RHSExp; 1765 ResultType = PTy->getPointeeType(); 1766 } else if (const ObjCObjectPointerType *PTy = 1767 RHSTy->getAsObjCObjectPointerType()) { 1768 // Handle the uncommon case of "123[Ptr]". 1769 BaseExpr = RHSExp; 1770 IndexExpr = LHSExp; 1771 ResultType = PTy->getPointeeType(); 1772 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1773 BaseExpr = LHSExp; // vectors: V[123] 1774 IndexExpr = RHSExp; 1775 1776 // FIXME: need to deal with const... 1777 ResultType = VTy->getElementType(); 1778 } else if (LHSTy->isArrayType()) { 1779 // If we see an array that wasn't promoted by 1780 // DefaultFunctionArrayConversion, it must be an array that 1781 // wasn't promoted because of the C90 rule that doesn't 1782 // allow promoting non-lvalue arrays. Warn, then 1783 // force the promotion here. 1784 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1785 LHSExp->getSourceRange(); 1786 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1787 LHSTy = LHSExp->getType(); 1788 1789 BaseExpr = LHSExp; 1790 IndexExpr = RHSExp; 1791 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1792 } else if (RHSTy->isArrayType()) { 1793 // Same as previous, except for 123[f().a] case 1794 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1795 RHSExp->getSourceRange(); 1796 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1797 RHSTy = RHSExp->getType(); 1798 1799 BaseExpr = RHSExp; 1800 IndexExpr = LHSExp; 1801 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1802 } else { 1803 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1804 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1805 } 1806 // C99 6.5.2.1p1 1807 if (!(IndexExpr->getType()->isIntegerType() && 1808 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1809 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1810 << IndexExpr->getSourceRange()); 1811 1812 QualType IndexTy = Context.getCanonicalType(IndexExpr->getType()); 1813 if ((IndexTy == Context.CharTy || IndexTy == Context.SignedCharTy) 1814 && !IndexExpr->isTypeDependent()) 1815 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange(); 1816 1817 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1818 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1819 // type. Note that Functions are not objects, and that (in C99 parlance) 1820 // incomplete types are not object types. 1821 if (ResultType->isFunctionType()) { 1822 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1823 << ResultType << BaseExpr->getSourceRange(); 1824 return ExprError(); 1825 } 1826 1827 if (!ResultType->isDependentType() && 1828 RequireCompleteType(LLoc, ResultType, 1829 PDiag(diag::err_subscript_incomplete_type) 1830 << BaseExpr->getSourceRange())) 1831 return ExprError(); 1832 1833 // Diagnose bad cases where we step over interface counts. 1834 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1835 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1836 << ResultType << BaseExpr->getSourceRange(); 1837 return ExprError(); 1838 } 1839 1840 Base.release(); 1841 Idx.release(); 1842 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1843 ResultType, RLoc)); 1844} 1845 1846QualType Sema:: 1847CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1848 const IdentifierInfo *CompName, 1849 SourceLocation CompLoc) { 1850 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1851 1852 // The vector accessor can't exceed the number of elements. 1853 const char *compStr = CompName->getName(); 1854 1855 // This flag determines whether or not the component is one of the four 1856 // special names that indicate a subset of exactly half the elements are 1857 // to be selected. 1858 bool HalvingSwizzle = false; 1859 1860 // This flag determines whether or not CompName has an 's' char prefix, 1861 // indicating that it is a string of hex values to be used as vector indices. 1862 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1863 1864 // Check that we've found one of the special components, or that the component 1865 // names must come from the same set. 1866 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1867 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1868 HalvingSwizzle = true; 1869 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1870 do 1871 compStr++; 1872 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1873 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1874 do 1875 compStr++; 1876 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1877 } 1878 1879 if (!HalvingSwizzle && *compStr) { 1880 // We didn't get to the end of the string. This means the component names 1881 // didn't come from the same set *or* we encountered an illegal name. 1882 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1883 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1884 return QualType(); 1885 } 1886 1887 // Ensure no component accessor exceeds the width of the vector type it 1888 // operates on. 1889 if (!HalvingSwizzle) { 1890 compStr = CompName->getName(); 1891 1892 if (HexSwizzle) 1893 compStr++; 1894 1895 while (*compStr) { 1896 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1897 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1898 << baseType << SourceRange(CompLoc); 1899 return QualType(); 1900 } 1901 } 1902 } 1903 1904 // If this is a halving swizzle, verify that the base type has an even 1905 // number of elements. 1906 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1907 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1908 << baseType << SourceRange(CompLoc); 1909 return QualType(); 1910 } 1911 1912 // The component accessor looks fine - now we need to compute the actual type. 1913 // The vector type is implied by the component accessor. For example, 1914 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1915 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1916 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1917 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1918 : CompName->getLength(); 1919 if (HexSwizzle) 1920 CompSize--; 1921 1922 if (CompSize == 1) 1923 return vecType->getElementType(); 1924 1925 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1926 // Now look up the TypeDefDecl from the vector type. Without this, 1927 // diagostics look bad. We want extended vector types to appear built-in. 1928 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1929 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1930 return Context.getTypedefType(ExtVectorDecls[i]); 1931 } 1932 return VT; // should never get here (a typedef type should always be found). 1933} 1934 1935static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1936 IdentifierInfo *Member, 1937 const Selector &Sel, 1938 ASTContext &Context) { 1939 1940 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1941 return PD; 1942 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1943 return OMD; 1944 1945 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1946 E = PDecl->protocol_end(); I != E; ++I) { 1947 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1948 Context)) 1949 return D; 1950 } 1951 return 0; 1952} 1953 1954static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1955 IdentifierInfo *Member, 1956 const Selector &Sel, 1957 ASTContext &Context) { 1958 // Check protocols on qualified interfaces. 1959 Decl *GDecl = 0; 1960 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1961 E = QIdTy->qual_end(); I != E; ++I) { 1962 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1963 GDecl = PD; 1964 break; 1965 } 1966 // Also must look for a getter name which uses property syntax. 1967 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1968 GDecl = OMD; 1969 break; 1970 } 1971 } 1972 if (!GDecl) { 1973 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1974 E = QIdTy->qual_end(); I != E; ++I) { 1975 // Search in the protocol-qualifier list of current protocol. 1976 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1977 if (GDecl) 1978 return GDecl; 1979 } 1980 } 1981 return GDecl; 1982} 1983 1984/// FindMethodInNestedImplementations - Look up a method in current and 1985/// all base class implementations. 1986/// 1987ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1988 const ObjCInterfaceDecl *IFace, 1989 const Selector &Sel) { 1990 ObjCMethodDecl *Method = 0; 1991 if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation()) 1992 Method = ImpDecl->getInstanceMethod(Sel); 1993 1994 if (!Method && IFace->getSuperClass()) 1995 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1996 return Method; 1997} 1998 1999Action::OwningExprResult 2000Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2001 tok::TokenKind OpKind, SourceLocation MemberLoc, 2002 DeclarationName MemberName, 2003 bool HasExplicitTemplateArgs, 2004 SourceLocation LAngleLoc, 2005 const TemplateArgument *ExplicitTemplateArgs, 2006 unsigned NumExplicitTemplateArgs, 2007 SourceLocation RAngleLoc, 2008 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 2009 NamedDecl *FirstQualifierInScope) { 2010 if (SS && SS->isInvalid()) 2011 return ExprError(); 2012 2013 // Since this might be a postfix expression, get rid of ParenListExprs. 2014 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 2015 2016 Expr *BaseExpr = Base.takeAs<Expr>(); 2017 assert(BaseExpr && "no base expression"); 2018 2019 // Perform default conversions. 2020 DefaultFunctionArrayConversion(BaseExpr); 2021 2022 QualType BaseType = BaseExpr->getType(); 2023 // If this is an Objective-C pseudo-builtin and a definition is provided then 2024 // use that. 2025 if (BaseType->isObjCIdType()) { 2026 // We have an 'id' type. Rather than fall through, we check if this 2027 // is a reference to 'isa'. 2028 if (BaseType != Context.ObjCIdRedefinitionType) { 2029 BaseType = Context.ObjCIdRedefinitionType; 2030 ImpCastExprToType(BaseExpr, BaseType); 2031 } 2032 } else if (BaseType->isObjCClassType() && 2033 BaseType != Context.ObjCClassRedefinitionType) { 2034 BaseType = Context.ObjCClassRedefinitionType; 2035 ImpCastExprToType(BaseExpr, BaseType); 2036 } 2037 assert(!BaseType.isNull() && "no type for member expression"); 2038 2039 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2040 // must have pointer type, and the accessed type is the pointee. 2041 if (OpKind == tok::arrow) { 2042 if (BaseType->isDependentType()) { 2043 NestedNameSpecifier *Qualifier = 0; 2044 if (SS) { 2045 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2046 if (!FirstQualifierInScope) 2047 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2048 } 2049 2050 return Owned(CXXUnresolvedMemberExpr::Create(Context, BaseExpr, true, 2051 OpLoc, Qualifier, 2052 SS? SS->getRange() : SourceRange(), 2053 FirstQualifierInScope, 2054 MemberName, 2055 MemberLoc, 2056 HasExplicitTemplateArgs, 2057 LAngleLoc, 2058 ExplicitTemplateArgs, 2059 NumExplicitTemplateArgs, 2060 RAngleLoc)); 2061 } 2062 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2063 BaseType = PT->getPointeeType(); 2064 else if (BaseType->isObjCObjectPointerType()) 2065 ; 2066 else 2067 return ExprError(Diag(MemberLoc, 2068 diag::err_typecheck_member_reference_arrow) 2069 << BaseType << BaseExpr->getSourceRange()); 2070 } else { 2071 if (BaseType->isDependentType()) { 2072 // Require that the base type isn't a pointer type 2073 // (so we'll report an error for) 2074 // T* t; 2075 // t.f; 2076 // 2077 // In Obj-C++, however, the above expression is valid, since it could be 2078 // accessing the 'f' property if T is an Obj-C interface. The extra check 2079 // allows this, while still reporting an error if T is a struct pointer. 2080 const PointerType *PT = BaseType->getAs<PointerType>(); 2081 2082 if (!PT || (getLangOptions().ObjC1 && 2083 !PT->getPointeeType()->isRecordType())) { 2084 NestedNameSpecifier *Qualifier = 0; 2085 if (SS) { 2086 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2087 if (!FirstQualifierInScope) 2088 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2089 } 2090 2091 return Owned(CXXUnresolvedMemberExpr::Create(Context, 2092 BaseExpr, false, 2093 OpLoc, 2094 Qualifier, 2095 SS? SS->getRange() : SourceRange(), 2096 FirstQualifierInScope, 2097 MemberName, 2098 MemberLoc, 2099 HasExplicitTemplateArgs, 2100 LAngleLoc, 2101 ExplicitTemplateArgs, 2102 NumExplicitTemplateArgs, 2103 RAngleLoc)); 2104 } 2105 } 2106 } 2107 2108 // Handle field access to simple records. This also handles access to fields 2109 // of the ObjC 'id' struct. 2110 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2111 RecordDecl *RDecl = RTy->getDecl(); 2112 if (RequireCompleteType(OpLoc, BaseType, 2113 PDiag(diag::err_typecheck_incomplete_tag) 2114 << BaseExpr->getSourceRange())) 2115 return ExprError(); 2116 2117 DeclContext *DC = RDecl; 2118 if (SS && SS->isSet()) { 2119 // If the member name was a qualified-id, look into the 2120 // nested-name-specifier. 2121 DC = computeDeclContext(*SS, false); 2122 2123 // FIXME: If DC is not computable, we should build a 2124 // CXXUnresolvedMemberExpr. 2125 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2126 } 2127 2128 // The record definition is complete, now make sure the member is valid. 2129 LookupResult Result 2130 = LookupQualifiedName(DC, MemberName, LookupMemberName, false); 2131 2132 if (!Result) 2133 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member_deprecated) 2134 << MemberName << BaseExpr->getSourceRange()); 2135 if (Result.isAmbiguous()) { 2136 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2137 BaseExpr->getSourceRange()); 2138 return ExprError(); 2139 } 2140 2141 if (SS && SS->isSet()) { 2142 QualType BaseTypeCanon 2143 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2144 QualType MemberTypeCanon 2145 = Context.getCanonicalType( 2146 Context.getTypeDeclType( 2147 dyn_cast<TypeDecl>(Result.getAsDecl()->getDeclContext()))); 2148 2149 if (BaseTypeCanon != MemberTypeCanon && 2150 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2151 return ExprError(Diag(SS->getBeginLoc(), 2152 diag::err_not_direct_base_or_virtual) 2153 << MemberTypeCanon << BaseTypeCanon); 2154 } 2155 2156 NamedDecl *MemberDecl = Result; 2157 2158 // If the decl being referenced had an error, return an error for this 2159 // sub-expr without emitting another error, in order to avoid cascading 2160 // error cases. 2161 if (MemberDecl->isInvalidDecl()) 2162 return ExprError(); 2163 2164 bool ShouldCheckUse = true; 2165 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { 2166 // Don't diagnose the use of a virtual member function unless it's 2167 // explicitly qualified. 2168 if (MD->isVirtual() && (!SS || !SS->isSet())) 2169 ShouldCheckUse = false; 2170 } 2171 2172 // Check the use of this field 2173 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2174 return ExprError(); 2175 2176 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2177 // We may have found a field within an anonymous union or struct 2178 // (C++ [class.union]). 2179 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2180 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2181 BaseExpr, OpLoc); 2182 2183 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2184 QualType MemberType = FD->getType(); 2185 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2186 MemberType = Ref->getPointeeType(); 2187 else { 2188 unsigned BaseAddrSpace = BaseType.getAddressSpace(); 2189 unsigned combinedQualifiers = 2190 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2191 if (FD->isMutable()) 2192 combinedQualifiers &= ~QualType::Const; 2193 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2194 if (BaseAddrSpace != MemberType.getAddressSpace()) 2195 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 2196 } 2197 2198 MarkDeclarationReferenced(MemberLoc, FD); 2199 if (PerformObjectMemberConversion(BaseExpr, FD)) 2200 return ExprError(); 2201 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2202 FD, MemberLoc, MemberType)); 2203 } 2204 2205 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2206 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2207 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2208 Var, MemberLoc, 2209 Var->getType().getNonReferenceType())); 2210 } 2211 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2212 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2213 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2214 MemberFn, MemberLoc, 2215 MemberFn->getType())); 2216 } 2217 if (FunctionTemplateDecl *FunTmpl 2218 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2219 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2220 2221 if (HasExplicitTemplateArgs) 2222 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2223 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2224 SS? SS->getRange() : SourceRange(), 2225 FunTmpl, MemberLoc, true, 2226 LAngleLoc, ExplicitTemplateArgs, 2227 NumExplicitTemplateArgs, RAngleLoc, 2228 Context.OverloadTy)); 2229 2230 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2231 FunTmpl, MemberLoc, 2232 Context.OverloadTy)); 2233 } 2234 if (OverloadedFunctionDecl *Ovl 2235 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2236 if (HasExplicitTemplateArgs) 2237 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2238 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2239 SS? SS->getRange() : SourceRange(), 2240 Ovl, MemberLoc, true, 2241 LAngleLoc, ExplicitTemplateArgs, 2242 NumExplicitTemplateArgs, RAngleLoc, 2243 Context.OverloadTy)); 2244 2245 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2246 Ovl, MemberLoc, Context.OverloadTy)); 2247 } 2248 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2249 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2250 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2251 Enum, MemberLoc, Enum->getType())); 2252 } 2253 if (isa<TypeDecl>(MemberDecl)) 2254 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2255 << MemberName << int(OpKind == tok::arrow)); 2256 2257 // We found a declaration kind that we didn't expect. This is a 2258 // generic error message that tells the user that she can't refer 2259 // to this member with '.' or '->'. 2260 return ExprError(Diag(MemberLoc, 2261 diag::err_typecheck_member_reference_unknown) 2262 << MemberName << int(OpKind == tok::arrow)); 2263 } 2264 2265 // Handle pseudo-destructors (C++ [expr.pseudo]). Since anything referring 2266 // into a record type was handled above, any destructor we see here is a 2267 // pseudo-destructor. 2268 if (MemberName.getNameKind() == DeclarationName::CXXDestructorName) { 2269 // C++ [expr.pseudo]p2: 2270 // The left hand side of the dot operator shall be of scalar type. The 2271 // left hand side of the arrow operator shall be of pointer to scalar 2272 // type. 2273 if (!BaseType->isScalarType()) 2274 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 2275 << BaseType << BaseExpr->getSourceRange()); 2276 2277 // [...] The type designated by the pseudo-destructor-name shall be the 2278 // same as the object type. 2279 if (!MemberName.getCXXNameType()->isDependentType() && 2280 !Context.hasSameUnqualifiedType(BaseType, MemberName.getCXXNameType())) 2281 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_type_mismatch) 2282 << BaseType << MemberName.getCXXNameType() 2283 << BaseExpr->getSourceRange() << SourceRange(MemberLoc)); 2284 2285 // [...] Furthermore, the two type-names in a pseudo-destructor-name of 2286 // the form 2287 // 2288 // ::[opt] nested-name-specifier[opt] type-name :: ̃ type-name 2289 // 2290 // shall designate the same scalar type. 2291 // 2292 // FIXME: DPG can't see any way to trigger this particular clause, so it 2293 // isn't checked here. 2294 2295 // FIXME: We've lost the precise spelling of the type by going through 2296 // DeclarationName. Can we do better? 2297 return Owned(new (Context) CXXPseudoDestructorExpr(Context, BaseExpr, 2298 OpKind == tok::arrow, 2299 OpLoc, 2300 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2301 SS? SS->getRange() : SourceRange(), 2302 MemberName.getCXXNameType(), 2303 MemberLoc)); 2304 } 2305 2306 // Handle properties on ObjC 'Class' types. 2307 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2308 // Also must look for a getter name which uses property syntax. 2309 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2310 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2311 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2312 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2313 ObjCMethodDecl *Getter; 2314 // FIXME: need to also look locally in the implementation. 2315 if ((Getter = IFace->lookupClassMethod(Sel))) { 2316 // Check the use of this method. 2317 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2318 return ExprError(); 2319 } 2320 // If we found a getter then this may be a valid dot-reference, we 2321 // will look for the matching setter, in case it is needed. 2322 Selector SetterSel = 2323 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2324 PP.getSelectorTable(), Member); 2325 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2326 if (!Setter) { 2327 // If this reference is in an @implementation, also check for 'private' 2328 // methods. 2329 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2330 } 2331 // Look through local category implementations associated with the class. 2332 if (!Setter) 2333 Setter = IFace->getCategoryClassMethod(SetterSel); 2334 2335 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2336 return ExprError(); 2337 2338 if (Getter || Setter) { 2339 QualType PType; 2340 2341 if (Getter) 2342 PType = Getter->getResultType(); 2343 else 2344 // Get the expression type from Setter's incoming parameter. 2345 PType = (*(Setter->param_end() -1))->getType(); 2346 // FIXME: we must check that the setter has property type. 2347 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2348 Setter, MemberLoc, BaseExpr)); 2349 } 2350 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2351 << MemberName << BaseType); 2352 } 2353 } 2354 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2355 // (*Obj).ivar. 2356 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2357 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2358 const ObjCObjectPointerType *OPT = BaseType->getAsObjCObjectPointerType(); 2359 const ObjCInterfaceType *IFaceT = 2360 OPT ? OPT->getInterfaceType() : BaseType->getAsObjCInterfaceType(); 2361 if (IFaceT) { 2362 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2363 2364 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2365 ObjCInterfaceDecl *ClassDeclared; 2366 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2367 2368 if (IV) { 2369 // If the decl being referenced had an error, return an error for this 2370 // sub-expr without emitting another error, in order to avoid cascading 2371 // error cases. 2372 if (IV->isInvalidDecl()) 2373 return ExprError(); 2374 2375 // Check whether we can reference this field. 2376 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2377 return ExprError(); 2378 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2379 IV->getAccessControl() != ObjCIvarDecl::Package) { 2380 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2381 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2382 ClassOfMethodDecl = MD->getClassInterface(); 2383 else if (ObjCImpDecl && getCurFunctionDecl()) { 2384 // Case of a c-function declared inside an objc implementation. 2385 // FIXME: For a c-style function nested inside an objc implementation 2386 // class, there is no implementation context available, so we pass 2387 // down the context as argument to this routine. Ideally, this context 2388 // need be passed down in the AST node and somehow calculated from the 2389 // AST for a function decl. 2390 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2391 if (ObjCImplementationDecl *IMPD = 2392 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2393 ClassOfMethodDecl = IMPD->getClassInterface(); 2394 else if (ObjCCategoryImplDecl* CatImplClass = 2395 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2396 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2397 } 2398 2399 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2400 if (ClassDeclared != IDecl || 2401 ClassOfMethodDecl != ClassDeclared) 2402 Diag(MemberLoc, diag::error_private_ivar_access) 2403 << IV->getDeclName(); 2404 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2405 // @protected 2406 Diag(MemberLoc, diag::error_protected_ivar_access) 2407 << IV->getDeclName(); 2408 } 2409 2410 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2411 MemberLoc, BaseExpr, 2412 OpKind == tok::arrow)); 2413 } 2414 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2415 << IDecl->getDeclName() << MemberName 2416 << BaseExpr->getSourceRange()); 2417 } 2418 } 2419 // Handle properties on 'id' and qualified "id". 2420 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2421 BaseType->isObjCQualifiedIdType())) { 2422 const ObjCObjectPointerType *QIdTy = BaseType->getAsObjCObjectPointerType(); 2423 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2424 2425 // Check protocols on qualified interfaces. 2426 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2427 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2428 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2429 // Check the use of this declaration 2430 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2431 return ExprError(); 2432 2433 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2434 MemberLoc, BaseExpr)); 2435 } 2436 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2437 // Check the use of this method. 2438 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2439 return ExprError(); 2440 2441 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2442 OMD->getResultType(), 2443 OMD, OpLoc, MemberLoc, 2444 NULL, 0)); 2445 } 2446 } 2447 2448 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2449 << MemberName << BaseType); 2450 } 2451 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2452 // pointer to a (potentially qualified) interface type. 2453 const ObjCObjectPointerType *OPT; 2454 if (OpKind == tok::period && 2455 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2456 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2457 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2458 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2459 2460 // Search for a declared property first. 2461 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2462 // Check whether we can reference this property. 2463 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2464 return ExprError(); 2465 QualType ResTy = PD->getType(); 2466 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2467 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2468 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2469 ResTy = Getter->getResultType(); 2470 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2471 MemberLoc, BaseExpr)); 2472 } 2473 // Check protocols on qualified interfaces. 2474 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2475 E = OPT->qual_end(); I != E; ++I) 2476 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2477 // Check whether we can reference this property. 2478 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2479 return ExprError(); 2480 2481 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2482 MemberLoc, BaseExpr)); 2483 } 2484 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2485 E = OPT->qual_end(); I != E; ++I) 2486 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2487 // Check whether we can reference this property. 2488 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2489 return ExprError(); 2490 2491 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2492 MemberLoc, BaseExpr)); 2493 } 2494 // If that failed, look for an "implicit" property by seeing if the nullary 2495 // selector is implemented. 2496 2497 // FIXME: The logic for looking up nullary and unary selectors should be 2498 // shared with the code in ActOnInstanceMessage. 2499 2500 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2501 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2502 2503 // If this reference is in an @implementation, check for 'private' methods. 2504 if (!Getter) 2505 Getter = FindMethodInNestedImplementations(IFace, Sel); 2506 2507 // Look through local category implementations associated with the class. 2508 if (!Getter) 2509 Getter = IFace->getCategoryInstanceMethod(Sel); 2510 if (Getter) { 2511 // Check if we can reference this property. 2512 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2513 return ExprError(); 2514 } 2515 // If we found a getter then this may be a valid dot-reference, we 2516 // will look for the matching setter, in case it is needed. 2517 Selector SetterSel = 2518 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2519 PP.getSelectorTable(), Member); 2520 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2521 if (!Setter) { 2522 // If this reference is in an @implementation, also check for 'private' 2523 // methods. 2524 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2525 } 2526 // Look through local category implementations associated with the class. 2527 if (!Setter) 2528 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2529 2530 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2531 return ExprError(); 2532 2533 if (Getter || Setter) { 2534 QualType PType; 2535 2536 if (Getter) 2537 PType = Getter->getResultType(); 2538 else 2539 // Get the expression type from Setter's incoming parameter. 2540 PType = (*(Setter->param_end() -1))->getType(); 2541 // FIXME: we must check that the setter has property type. 2542 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2543 Setter, MemberLoc, BaseExpr)); 2544 } 2545 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2546 << MemberName << BaseType); 2547 } 2548 2549 // Handle the following exceptional case (*Obj).isa. 2550 if (OpKind == tok::period && 2551 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2552 MemberName.getAsIdentifierInfo()->isStr("isa")) 2553 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2554 Context.getObjCIdType())); 2555 2556 // Handle 'field access' to vectors, such as 'V.xx'. 2557 if (BaseType->isExtVectorType()) { 2558 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2559 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2560 if (ret.isNull()) 2561 return ExprError(); 2562 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2563 MemberLoc)); 2564 } 2565 2566 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2567 << BaseType << BaseExpr->getSourceRange(); 2568 2569 // If the user is trying to apply -> or . to a function or function 2570 // pointer, it's probably because they forgot parentheses to call 2571 // the function. Suggest the addition of those parentheses. 2572 if (BaseType == Context.OverloadTy || 2573 BaseType->isFunctionType() || 2574 (BaseType->isPointerType() && 2575 BaseType->getAs<PointerType>()->isFunctionType())) { 2576 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2577 Diag(Loc, diag::note_member_reference_needs_call) 2578 << CodeModificationHint::CreateInsertion(Loc, "()"); 2579 } 2580 2581 return ExprError(); 2582} 2583 2584Action::OwningExprResult 2585Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2586 tok::TokenKind OpKind, SourceLocation MemberLoc, 2587 IdentifierInfo &Member, 2588 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2589 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2590 DeclarationName(&Member), ObjCImpDecl, SS); 2591} 2592 2593Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2594 FunctionDecl *FD, 2595 ParmVarDecl *Param) { 2596 if (Param->hasUnparsedDefaultArg()) { 2597 Diag (CallLoc, 2598 diag::err_use_of_default_argument_to_function_declared_later) << 2599 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2600 Diag(UnparsedDefaultArgLocs[Param], 2601 diag::note_default_argument_declared_here); 2602 } else { 2603 if (Param->hasUninstantiatedDefaultArg()) { 2604 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2605 2606 // Instantiate the expression. 2607 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2608 2609 InstantiatingTemplate Inst(*this, CallLoc, Param, 2610 ArgList.getInnermost().getFlatArgumentList(), 2611 ArgList.getInnermost().flat_size()); 2612 2613 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2614 if (Result.isInvalid()) 2615 return ExprError(); 2616 2617 if (SetParamDefaultArgument(Param, move(Result), 2618 /*FIXME:EqualLoc*/ 2619 UninstExpr->getSourceRange().getBegin())) 2620 return ExprError(); 2621 } 2622 2623 Expr *DefaultExpr = Param->getDefaultArg(); 2624 2625 // If the default expression creates temporaries, we need to 2626 // push them to the current stack of expression temporaries so they'll 2627 // be properly destroyed. 2628 if (CXXExprWithTemporaries *E 2629 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2630 assert(!E->shouldDestroyTemporaries() && 2631 "Can't destroy temporaries in a default argument expr!"); 2632 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2633 ExprTemporaries.push_back(E->getTemporary(I)); 2634 } 2635 } 2636 2637 // We already type-checked the argument, so we know it works. 2638 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2639} 2640 2641/// ConvertArgumentsForCall - Converts the arguments specified in 2642/// Args/NumArgs to the parameter types of the function FDecl with 2643/// function prototype Proto. Call is the call expression itself, and 2644/// Fn is the function expression. For a C++ member function, this 2645/// routine does not attempt to convert the object argument. Returns 2646/// true if the call is ill-formed. 2647bool 2648Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2649 FunctionDecl *FDecl, 2650 const FunctionProtoType *Proto, 2651 Expr **Args, unsigned NumArgs, 2652 SourceLocation RParenLoc) { 2653 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2654 // assignment, to the types of the corresponding parameter, ... 2655 unsigned NumArgsInProto = Proto->getNumArgs(); 2656 unsigned NumArgsToCheck = NumArgs; 2657 bool Invalid = false; 2658 2659 // If too few arguments are available (and we don't have default 2660 // arguments for the remaining parameters), don't make the call. 2661 if (NumArgs < NumArgsInProto) { 2662 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2663 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2664 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2665 // Use default arguments for missing arguments 2666 NumArgsToCheck = NumArgsInProto; 2667 Call->setNumArgs(Context, NumArgsInProto); 2668 } 2669 2670 // If too many are passed and not variadic, error on the extras and drop 2671 // them. 2672 if (NumArgs > NumArgsInProto) { 2673 if (!Proto->isVariadic()) { 2674 Diag(Args[NumArgsInProto]->getLocStart(), 2675 diag::err_typecheck_call_too_many_args) 2676 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2677 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2678 Args[NumArgs-1]->getLocEnd()); 2679 // This deletes the extra arguments. 2680 Call->setNumArgs(Context, NumArgsInProto); 2681 Invalid = true; 2682 } 2683 NumArgsToCheck = NumArgsInProto; 2684 } 2685 2686 // Continue to check argument types (even if we have too few/many args). 2687 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2688 QualType ProtoArgType = Proto->getArgType(i); 2689 2690 Expr *Arg; 2691 if (i < NumArgs) { 2692 Arg = Args[i]; 2693 2694 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2695 ProtoArgType, 2696 PDiag(diag::err_call_incomplete_argument) 2697 << Arg->getSourceRange())) 2698 return true; 2699 2700 // Pass the argument. 2701 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2702 return true; 2703 } else { 2704 ParmVarDecl *Param = FDecl->getParamDecl(i); 2705 2706 OwningExprResult ArgExpr = 2707 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2708 FDecl, Param); 2709 if (ArgExpr.isInvalid()) 2710 return true; 2711 2712 Arg = ArgExpr.takeAs<Expr>(); 2713 } 2714 2715 Call->setArg(i, Arg); 2716 } 2717 2718 // If this is a variadic call, handle args passed through "...". 2719 if (Proto->isVariadic()) { 2720 VariadicCallType CallType = VariadicFunction; 2721 if (Fn->getType()->isBlockPointerType()) 2722 CallType = VariadicBlock; // Block 2723 else if (isa<MemberExpr>(Fn)) 2724 CallType = VariadicMethod; 2725 2726 // Promote the arguments (C99 6.5.2.2p7). 2727 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2728 Expr *Arg = Args[i]; 2729 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2730 Call->setArg(i, Arg); 2731 } 2732 } 2733 2734 return Invalid; 2735} 2736 2737/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2738/// This provides the location of the left/right parens and a list of comma 2739/// locations. 2740Action::OwningExprResult 2741Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2742 MultiExprArg args, 2743 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2744 unsigned NumArgs = args.size(); 2745 2746 // Since this might be a postfix expression, get rid of ParenListExprs. 2747 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2748 2749 Expr *Fn = fn.takeAs<Expr>(); 2750 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2751 assert(Fn && "no function call expression"); 2752 FunctionDecl *FDecl = NULL; 2753 NamedDecl *NDecl = NULL; 2754 DeclarationName UnqualifiedName; 2755 2756 if (getLangOptions().CPlusPlus) { 2757 // If this is a pseudo-destructor expression, build the call immediately. 2758 if (isa<CXXPseudoDestructorExpr>(Fn)) { 2759 if (NumArgs > 0) { 2760 // Pseudo-destructor calls should not have any arguments. 2761 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args) 2762 << CodeModificationHint::CreateRemoval( 2763 SourceRange(Args[0]->getLocStart(), 2764 Args[NumArgs-1]->getLocEnd())); 2765 2766 for (unsigned I = 0; I != NumArgs; ++I) 2767 Args[I]->Destroy(Context); 2768 2769 NumArgs = 0; 2770 } 2771 2772 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy, 2773 RParenLoc)); 2774 } 2775 2776 // Determine whether this is a dependent call inside a C++ template, 2777 // in which case we won't do any semantic analysis now. 2778 // FIXME: Will need to cache the results of name lookup (including ADL) in 2779 // Fn. 2780 bool Dependent = false; 2781 if (Fn->isTypeDependent()) 2782 Dependent = true; 2783 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2784 Dependent = true; 2785 2786 if (Dependent) 2787 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2788 Context.DependentTy, RParenLoc)); 2789 2790 // Determine whether this is a call to an object (C++ [over.call.object]). 2791 if (Fn->getType()->isRecordType()) 2792 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2793 CommaLocs, RParenLoc)); 2794 2795 // Determine whether this is a call to a member function. 2796 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2797 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2798 if (isa<OverloadedFunctionDecl>(MemDecl) || 2799 isa<CXXMethodDecl>(MemDecl) || 2800 (isa<FunctionTemplateDecl>(MemDecl) && 2801 isa<CXXMethodDecl>( 2802 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2803 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2804 CommaLocs, RParenLoc)); 2805 } 2806 } 2807 2808 // If we're directly calling a function, get the appropriate declaration. 2809 // Also, in C++, keep track of whether we should perform argument-dependent 2810 // lookup and whether there were any explicitly-specified template arguments. 2811 Expr *FnExpr = Fn; 2812 bool ADL = true; 2813 bool HasExplicitTemplateArgs = 0; 2814 const TemplateArgument *ExplicitTemplateArgs = 0; 2815 unsigned NumExplicitTemplateArgs = 0; 2816 while (true) { 2817 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2818 FnExpr = IcExpr->getSubExpr(); 2819 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2820 // Parentheses around a function disable ADL 2821 // (C++0x [basic.lookup.argdep]p1). 2822 ADL = false; 2823 FnExpr = PExpr->getSubExpr(); 2824 } else if (isa<UnaryOperator>(FnExpr) && 2825 cast<UnaryOperator>(FnExpr)->getOpcode() 2826 == UnaryOperator::AddrOf) { 2827 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2828 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2829 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2830 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2831 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2832 break; 2833 } else if (UnresolvedFunctionNameExpr *DepName 2834 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2835 UnqualifiedName = DepName->getName(); 2836 break; 2837 } else if (TemplateIdRefExpr *TemplateIdRef 2838 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2839 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2840 if (!NDecl) 2841 NDecl = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2842 HasExplicitTemplateArgs = true; 2843 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2844 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2845 2846 // C++ [temp.arg.explicit]p6: 2847 // [Note: For simple function names, argument dependent lookup (3.4.2) 2848 // applies even when the function name is not visible within the 2849 // scope of the call. This is because the call still has the syntactic 2850 // form of a function call (3.4.1). But when a function template with 2851 // explicit template arguments is used, the call does not have the 2852 // correct syntactic form unless there is a function template with 2853 // that name visible at the point of the call. If no such name is 2854 // visible, the call is not syntactically well-formed and 2855 // argument-dependent lookup does not apply. If some such name is 2856 // visible, argument dependent lookup applies and additional function 2857 // templates may be found in other namespaces. 2858 // 2859 // The summary of this paragraph is that, if we get to this point and the 2860 // template-id was not a qualified name, then argument-dependent lookup 2861 // is still possible. 2862 if (TemplateIdRef->getQualifier()) 2863 ADL = false; 2864 break; 2865 } else { 2866 // Any kind of name that does not refer to a declaration (or 2867 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2868 ADL = false; 2869 break; 2870 } 2871 } 2872 2873 OverloadedFunctionDecl *Ovl = 0; 2874 FunctionTemplateDecl *FunctionTemplate = 0; 2875 if (NDecl) { 2876 FDecl = dyn_cast<FunctionDecl>(NDecl); 2877 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2878 FDecl = FunctionTemplate->getTemplatedDecl(); 2879 else 2880 FDecl = dyn_cast<FunctionDecl>(NDecl); 2881 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2882 } 2883 2884 if (Ovl || FunctionTemplate || 2885 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2886 // We don't perform ADL for implicit declarations of builtins. 2887 if (FDecl && FDecl->getBuiltinID() && FDecl->isImplicit()) 2888 ADL = false; 2889 2890 // We don't perform ADL in C. 2891 if (!getLangOptions().CPlusPlus) 2892 ADL = false; 2893 2894 if (Ovl || FunctionTemplate || ADL) { 2895 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2896 HasExplicitTemplateArgs, 2897 ExplicitTemplateArgs, 2898 NumExplicitTemplateArgs, 2899 LParenLoc, Args, NumArgs, CommaLocs, 2900 RParenLoc, ADL); 2901 if (!FDecl) 2902 return ExprError(); 2903 2904 // Update Fn to refer to the actual function selected. 2905 Expr *NewFn = 0; 2906 if (QualifiedDeclRefExpr *QDRExpr 2907 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2908 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2909 QDRExpr->getLocation(), 2910 false, false, 2911 QDRExpr->getQualifierRange(), 2912 QDRExpr->getQualifier()); 2913 else 2914 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2915 Fn->getSourceRange().getBegin()); 2916 Fn->Destroy(Context); 2917 Fn = NewFn; 2918 } 2919 } 2920 2921 // Promote the function operand. 2922 UsualUnaryConversions(Fn); 2923 2924 // Make the call expr early, before semantic checks. This guarantees cleanup 2925 // of arguments and function on error. 2926 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2927 Args, NumArgs, 2928 Context.BoolTy, 2929 RParenLoc)); 2930 2931 const FunctionType *FuncT; 2932 if (!Fn->getType()->isBlockPointerType()) { 2933 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2934 // have type pointer to function". 2935 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 2936 if (PT == 0) 2937 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2938 << Fn->getType() << Fn->getSourceRange()); 2939 FuncT = PT->getPointeeType()->getAsFunctionType(); 2940 } else { // This is a block call. 2941 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 2942 getAsFunctionType(); 2943 } 2944 if (FuncT == 0) 2945 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2946 << Fn->getType() << Fn->getSourceRange()); 2947 2948 // Check for a valid return type 2949 if (!FuncT->getResultType()->isVoidType() && 2950 RequireCompleteType(Fn->getSourceRange().getBegin(), 2951 FuncT->getResultType(), 2952 PDiag(diag::err_call_incomplete_return) 2953 << TheCall->getSourceRange())) 2954 return ExprError(); 2955 2956 // We know the result type of the call, set it. 2957 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2958 2959 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2960 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2961 RParenLoc)) 2962 return ExprError(); 2963 } else { 2964 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2965 2966 if (FDecl) { 2967 // Check if we have too few/too many template arguments, based 2968 // on our knowledge of the function definition. 2969 const FunctionDecl *Def = 0; 2970 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2971 const FunctionProtoType *Proto = 2972 Def->getType()->getAsFunctionProtoType(); 2973 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2974 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2975 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2976 } 2977 } 2978 } 2979 2980 // Promote the arguments (C99 6.5.2.2p6). 2981 for (unsigned i = 0; i != NumArgs; i++) { 2982 Expr *Arg = Args[i]; 2983 DefaultArgumentPromotion(Arg); 2984 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2985 Arg->getType(), 2986 PDiag(diag::err_call_incomplete_argument) 2987 << Arg->getSourceRange())) 2988 return ExprError(); 2989 TheCall->setArg(i, Arg); 2990 } 2991 } 2992 2993 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2994 if (!Method->isStatic()) 2995 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2996 << Fn->getSourceRange()); 2997 2998 // Check for sentinels 2999 if (NDecl) 3000 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 3001 3002 // Do special checking on direct calls to functions. 3003 if (FDecl) { 3004 if (CheckFunctionCall(FDecl, TheCall.get())) 3005 return ExprError(); 3006 3007 if (unsigned BuiltinID = FDecl->getBuiltinID()) 3008 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 3009 } else if (NDecl) { 3010 if (CheckBlockCall(NDecl, TheCall.get())) 3011 return ExprError(); 3012 } 3013 3014 return MaybeBindToTemporary(TheCall.take()); 3015} 3016 3017Action::OwningExprResult 3018Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 3019 SourceLocation RParenLoc, ExprArg InitExpr) { 3020 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 3021 //FIXME: Preserve type source info. 3022 QualType literalType = GetTypeFromParser(Ty); 3023 // FIXME: put back this assert when initializers are worked out. 3024 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 3025 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 3026 3027 if (literalType->isArrayType()) { 3028 if (literalType->isVariableArrayType()) 3029 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 3030 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 3031 } else if (!literalType->isDependentType() && 3032 RequireCompleteType(LParenLoc, literalType, 3033 PDiag(diag::err_typecheck_decl_incomplete_type) 3034 << SourceRange(LParenLoc, 3035 literalExpr->getSourceRange().getEnd()))) 3036 return ExprError(); 3037 3038 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 3039 DeclarationName(), /*FIXME:DirectInit=*/false)) 3040 return ExprError(); 3041 3042 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 3043 if (isFileScope) { // 6.5.2.5p3 3044 if (CheckForConstantInitializer(literalExpr, literalType)) 3045 return ExprError(); 3046 } 3047 InitExpr.release(); 3048 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 3049 literalExpr, isFileScope)); 3050} 3051 3052Action::OwningExprResult 3053Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 3054 SourceLocation RBraceLoc) { 3055 unsigned NumInit = initlist.size(); 3056 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 3057 3058 // Semantic analysis for initializers is done by ActOnDeclarator() and 3059 // CheckInitializer() - it requires knowledge of the object being intialized. 3060 3061 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 3062 RBraceLoc); 3063 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 3064 return Owned(E); 3065} 3066 3067/// CheckCastTypes - Check type constraints for casting between types. 3068bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 3069 CastExpr::CastKind& Kind, 3070 CXXMethodDecl *& ConversionDecl, 3071 bool FunctionalStyle) { 3072 if (getLangOptions().CPlusPlus) 3073 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 3074 ConversionDecl); 3075 3076 DefaultFunctionArrayConversion(castExpr); 3077 3078 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 3079 // type needs to be scalar. 3080 if (castType->isVoidType()) { 3081 // Cast to void allows any expr type. 3082 } else if (!castType->isScalarType() && !castType->isVectorType()) { 3083 if (Context.getCanonicalType(castType).getUnqualifiedType() == 3084 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 3085 (castType->isStructureType() || castType->isUnionType())) { 3086 // GCC struct/union extension: allow cast to self. 3087 // FIXME: Check that the cast destination type is complete. 3088 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3089 << castType << castExpr->getSourceRange(); 3090 Kind = CastExpr::CK_NoOp; 3091 } else if (castType->isUnionType()) { 3092 // GCC cast to union extension 3093 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3094 RecordDecl::field_iterator Field, FieldEnd; 3095 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3096 Field != FieldEnd; ++Field) { 3097 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3098 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3099 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3100 << castExpr->getSourceRange(); 3101 break; 3102 } 3103 } 3104 if (Field == FieldEnd) 3105 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3106 << castExpr->getType() << castExpr->getSourceRange(); 3107 Kind = CastExpr::CK_ToUnion; 3108 } else { 3109 // Reject any other conversions to non-scalar types. 3110 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3111 << castType << castExpr->getSourceRange(); 3112 } 3113 } else if (!castExpr->getType()->isScalarType() && 3114 !castExpr->getType()->isVectorType()) { 3115 return Diag(castExpr->getLocStart(), 3116 diag::err_typecheck_expect_scalar_operand) 3117 << castExpr->getType() << castExpr->getSourceRange(); 3118 } else if (castType->isExtVectorType()) { 3119 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 3120 return true; 3121 } else if (castType->isVectorType()) { 3122 if (CheckVectorCast(TyR, castType, castExpr->getType())) 3123 return true; 3124 } else if (castExpr->getType()->isVectorType()) { 3125 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 3126 return true; 3127 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 3128 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3129 } else if (!castType->isArithmeticType()) { 3130 QualType castExprType = castExpr->getType(); 3131 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3132 return Diag(castExpr->getLocStart(), 3133 diag::err_cast_pointer_from_non_pointer_int) 3134 << castExprType << castExpr->getSourceRange(); 3135 } else if (!castExpr->getType()->isArithmeticType()) { 3136 if (!castType->isIntegralType() && castType->isArithmeticType()) 3137 return Diag(castExpr->getLocStart(), 3138 diag::err_cast_pointer_to_non_pointer_int) 3139 << castType << castExpr->getSourceRange(); 3140 } 3141 if (isa<ObjCSelectorExpr>(castExpr)) 3142 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3143 return false; 3144} 3145 3146bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 3147 assert(VectorTy->isVectorType() && "Not a vector type!"); 3148 3149 if (Ty->isVectorType() || Ty->isIntegerType()) { 3150 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3151 return Diag(R.getBegin(), 3152 Ty->isVectorType() ? 3153 diag::err_invalid_conversion_between_vectors : 3154 diag::err_invalid_conversion_between_vector_and_integer) 3155 << VectorTy << Ty << R; 3156 } else 3157 return Diag(R.getBegin(), 3158 diag::err_invalid_conversion_between_vector_and_scalar) 3159 << VectorTy << Ty << R; 3160 3161 return false; 3162} 3163 3164bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3165 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3166 3167 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3168 // an ExtVectorType. 3169 if (SrcTy->isVectorType()) { 3170 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3171 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3172 << DestTy << SrcTy << R; 3173 return false; 3174 } 3175 3176 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3177 // conversion will take place first from scalar to elt type, and then 3178 // splat from elt type to vector. 3179 if (SrcTy->isPointerType()) 3180 return Diag(R.getBegin(), 3181 diag::err_invalid_conversion_between_vector_and_scalar) 3182 << DestTy << SrcTy << R; 3183 return false; 3184} 3185 3186Action::OwningExprResult 3187Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3188 SourceLocation RParenLoc, ExprArg Op) { 3189 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3190 3191 assert((Ty != 0) && (Op.get() != 0) && 3192 "ActOnCastExpr(): missing type or expr"); 3193 3194 Expr *castExpr = (Expr *)Op.get(); 3195 //FIXME: Preserve type source info. 3196 QualType castType = GetTypeFromParser(Ty); 3197 3198 // If the Expr being casted is a ParenListExpr, handle it specially. 3199 if (isa<ParenListExpr>(castExpr)) 3200 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3201 CXXMethodDecl *Method = 0; 3202 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3203 Kind, Method)) 3204 return ExprError(); 3205 3206 if (Method) { 3207 OwningExprResult CastArg = BuildCXXCastArgument(LParenLoc, castType, Kind, 3208 Method, move(Op)); 3209 3210 if (CastArg.isInvalid()) 3211 return ExprError(); 3212 3213 castExpr = CastArg.takeAs<Expr>(); 3214 } else { 3215 Op.release(); 3216 } 3217 3218 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3219 Kind, castExpr, castType, 3220 LParenLoc, RParenLoc)); 3221} 3222 3223/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3224/// of comma binary operators. 3225Action::OwningExprResult 3226Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3227 Expr *expr = EA.takeAs<Expr>(); 3228 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3229 if (!E) 3230 return Owned(expr); 3231 3232 OwningExprResult Result(*this, E->getExpr(0)); 3233 3234 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3235 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3236 Owned(E->getExpr(i))); 3237 3238 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3239} 3240 3241Action::OwningExprResult 3242Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3243 SourceLocation RParenLoc, ExprArg Op, 3244 QualType Ty) { 3245 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3246 3247 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3248 // then handle it as such. 3249 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3250 if (PE->getNumExprs() == 0) { 3251 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3252 return ExprError(); 3253 } 3254 3255 llvm::SmallVector<Expr *, 8> initExprs; 3256 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3257 initExprs.push_back(PE->getExpr(i)); 3258 3259 // FIXME: This means that pretty-printing the final AST will produce curly 3260 // braces instead of the original commas. 3261 Op.release(); 3262 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3263 initExprs.size(), RParenLoc); 3264 E->setType(Ty); 3265 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3266 Owned(E)); 3267 } else { 3268 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3269 // sequence of BinOp comma operators. 3270 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3271 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3272 } 3273} 3274 3275Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3276 SourceLocation R, 3277 MultiExprArg Val) { 3278 unsigned nexprs = Val.size(); 3279 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3280 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3281 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3282 return Owned(expr); 3283} 3284 3285/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3286/// In that case, lhs = cond. 3287/// C99 6.5.15 3288QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3289 SourceLocation QuestionLoc) { 3290 // C++ is sufficiently different to merit its own checker. 3291 if (getLangOptions().CPlusPlus) 3292 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3293 3294 UsualUnaryConversions(Cond); 3295 UsualUnaryConversions(LHS); 3296 UsualUnaryConversions(RHS); 3297 QualType CondTy = Cond->getType(); 3298 QualType LHSTy = LHS->getType(); 3299 QualType RHSTy = RHS->getType(); 3300 3301 // first, check the condition. 3302 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3303 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3304 << CondTy; 3305 return QualType(); 3306 } 3307 3308 // Now check the two expressions. 3309 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3310 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3311 3312 // If both operands have arithmetic type, do the usual arithmetic conversions 3313 // to find a common type: C99 6.5.15p3,5. 3314 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3315 UsualArithmeticConversions(LHS, RHS); 3316 return LHS->getType(); 3317 } 3318 3319 // If both operands are the same structure or union type, the result is that 3320 // type. 3321 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3322 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3323 if (LHSRT->getDecl() == RHSRT->getDecl()) 3324 // "If both the operands have structure or union type, the result has 3325 // that type." This implies that CV qualifiers are dropped. 3326 return LHSTy.getUnqualifiedType(); 3327 // FIXME: Type of conditional expression must be complete in C mode. 3328 } 3329 3330 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3331 // The following || allows only one side to be void (a GCC-ism). 3332 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3333 if (!LHSTy->isVoidType()) 3334 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3335 << RHS->getSourceRange(); 3336 if (!RHSTy->isVoidType()) 3337 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3338 << LHS->getSourceRange(); 3339 ImpCastExprToType(LHS, Context.VoidTy); 3340 ImpCastExprToType(RHS, Context.VoidTy); 3341 return Context.VoidTy; 3342 } 3343 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3344 // the type of the other operand." 3345 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3346 RHS->isNullPointerConstant(Context)) { 3347 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3348 return LHSTy; 3349 } 3350 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3351 LHS->isNullPointerConstant(Context)) { 3352 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3353 return RHSTy; 3354 } 3355 // Handle things like Class and struct objc_class*. Here we case the result 3356 // to the pseudo-builtin, because that will be implicitly cast back to the 3357 // redefinition type if an attempt is made to access its fields. 3358 if (LHSTy->isObjCClassType() && 3359 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3360 ImpCastExprToType(RHS, LHSTy); 3361 return LHSTy; 3362 } 3363 if (RHSTy->isObjCClassType() && 3364 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3365 ImpCastExprToType(LHS, RHSTy); 3366 return RHSTy; 3367 } 3368 // And the same for struct objc_object* / id 3369 if (LHSTy->isObjCIdType() && 3370 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3371 ImpCastExprToType(RHS, LHSTy); 3372 return LHSTy; 3373 } 3374 if (RHSTy->isObjCIdType() && 3375 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3376 ImpCastExprToType(LHS, RHSTy); 3377 return RHSTy; 3378 } 3379 // Handle block pointer types. 3380 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3381 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3382 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3383 QualType destType = Context.getPointerType(Context.VoidTy); 3384 ImpCastExprToType(LHS, destType); 3385 ImpCastExprToType(RHS, destType); 3386 return destType; 3387 } 3388 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3389 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3390 return QualType(); 3391 } 3392 // We have 2 block pointer types. 3393 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3394 // Two identical block pointer types are always compatible. 3395 return LHSTy; 3396 } 3397 // The block pointer types aren't identical, continue checking. 3398 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3399 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3400 3401 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3402 rhptee.getUnqualifiedType())) { 3403 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3404 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3405 // In this situation, we assume void* type. No especially good 3406 // reason, but this is what gcc does, and we do have to pick 3407 // to get a consistent AST. 3408 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3409 ImpCastExprToType(LHS, incompatTy); 3410 ImpCastExprToType(RHS, incompatTy); 3411 return incompatTy; 3412 } 3413 // The block pointer types are compatible. 3414 ImpCastExprToType(LHS, LHSTy); 3415 ImpCastExprToType(RHS, LHSTy); 3416 return LHSTy; 3417 } 3418 // Check constraints for Objective-C object pointers types. 3419 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3420 3421 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3422 // Two identical object pointer types are always compatible. 3423 return LHSTy; 3424 } 3425 const ObjCObjectPointerType *LHSOPT = LHSTy->getAsObjCObjectPointerType(); 3426 const ObjCObjectPointerType *RHSOPT = RHSTy->getAsObjCObjectPointerType(); 3427 QualType compositeType = LHSTy; 3428 3429 // If both operands are interfaces and either operand can be 3430 // assigned to the other, use that type as the composite 3431 // type. This allows 3432 // xxx ? (A*) a : (B*) b 3433 // where B is a subclass of A. 3434 // 3435 // Additionally, as for assignment, if either type is 'id' 3436 // allow silent coercion. Finally, if the types are 3437 // incompatible then make sure to use 'id' as the composite 3438 // type so the result is acceptable for sending messages to. 3439 3440 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3441 // It could return the composite type. 3442 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3443 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3444 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3445 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3446 } else if ((LHSTy->isObjCQualifiedIdType() || 3447 RHSTy->isObjCQualifiedIdType()) && 3448 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3449 // Need to handle "id<xx>" explicitly. 3450 // GCC allows qualified id and any Objective-C type to devolve to 3451 // id. Currently localizing to here until clear this should be 3452 // part of ObjCQualifiedIdTypesAreCompatible. 3453 compositeType = Context.getObjCIdType(); 3454 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3455 compositeType = Context.getObjCIdType(); 3456 } else { 3457 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3458 << LHSTy << RHSTy 3459 << LHS->getSourceRange() << RHS->getSourceRange(); 3460 QualType incompatTy = Context.getObjCIdType(); 3461 ImpCastExprToType(LHS, incompatTy); 3462 ImpCastExprToType(RHS, incompatTy); 3463 return incompatTy; 3464 } 3465 // The object pointer types are compatible. 3466 ImpCastExprToType(LHS, compositeType); 3467 ImpCastExprToType(RHS, compositeType); 3468 return compositeType; 3469 } 3470 // Check Objective-C object pointer types and 'void *' 3471 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3472 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3473 QualType rhptee = RHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3474 QualType destPointee = lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3475 QualType destType = Context.getPointerType(destPointee); 3476 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3477 ImpCastExprToType(RHS, destType); // promote to void* 3478 return destType; 3479 } 3480 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3481 QualType lhptee = LHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3482 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3483 QualType destPointee = rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3484 QualType destType = Context.getPointerType(destPointee); 3485 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3486 ImpCastExprToType(LHS, destType); // promote to void* 3487 return destType; 3488 } 3489 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3490 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3491 // get the "pointed to" types 3492 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3493 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3494 3495 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3496 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3497 // Figure out necessary qualifiers (C99 6.5.15p6) 3498 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3499 QualType destType = Context.getPointerType(destPointee); 3500 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3501 ImpCastExprToType(RHS, destType); // promote to void* 3502 return destType; 3503 } 3504 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3505 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3506 QualType destType = Context.getPointerType(destPointee); 3507 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3508 ImpCastExprToType(RHS, destType); // promote to void* 3509 return destType; 3510 } 3511 3512 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3513 // Two identical pointer types are always compatible. 3514 return LHSTy; 3515 } 3516 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3517 rhptee.getUnqualifiedType())) { 3518 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3519 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3520 // In this situation, we assume void* type. No especially good 3521 // reason, but this is what gcc does, and we do have to pick 3522 // to get a consistent AST. 3523 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3524 ImpCastExprToType(LHS, incompatTy); 3525 ImpCastExprToType(RHS, incompatTy); 3526 return incompatTy; 3527 } 3528 // The pointer types are compatible. 3529 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3530 // differently qualified versions of compatible types, the result type is 3531 // a pointer to an appropriately qualified version of the *composite* 3532 // type. 3533 // FIXME: Need to calculate the composite type. 3534 // FIXME: Need to add qualifiers 3535 ImpCastExprToType(LHS, LHSTy); 3536 ImpCastExprToType(RHS, LHSTy); 3537 return LHSTy; 3538 } 3539 3540 // GCC compatibility: soften pointer/integer mismatch. 3541 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3542 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3543 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3544 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3545 return RHSTy; 3546 } 3547 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3548 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3549 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3550 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3551 return LHSTy; 3552 } 3553 3554 // Otherwise, the operands are not compatible. 3555 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3556 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3557 return QualType(); 3558} 3559 3560/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3561/// in the case of a the GNU conditional expr extension. 3562Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3563 SourceLocation ColonLoc, 3564 ExprArg Cond, ExprArg LHS, 3565 ExprArg RHS) { 3566 Expr *CondExpr = (Expr *) Cond.get(); 3567 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3568 3569 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3570 // was the condition. 3571 bool isLHSNull = LHSExpr == 0; 3572 if (isLHSNull) 3573 LHSExpr = CondExpr; 3574 3575 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3576 RHSExpr, QuestionLoc); 3577 if (result.isNull()) 3578 return ExprError(); 3579 3580 Cond.release(); 3581 LHS.release(); 3582 RHS.release(); 3583 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3584 isLHSNull ? 0 : LHSExpr, 3585 ColonLoc, RHSExpr, result)); 3586} 3587 3588// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3589// being closely modeled after the C99 spec:-). The odd characteristic of this 3590// routine is it effectively iqnores the qualifiers on the top level pointee. 3591// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3592// FIXME: add a couple examples in this comment. 3593Sema::AssignConvertType 3594Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3595 QualType lhptee, rhptee; 3596 3597 if ((lhsType->isObjCClassType() && 3598 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3599 (rhsType->isObjCClassType() && 3600 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3601 return Compatible; 3602 } 3603 3604 // get the "pointed to" type (ignoring qualifiers at the top level) 3605 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3606 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3607 3608 // make sure we operate on the canonical type 3609 lhptee = Context.getCanonicalType(lhptee); 3610 rhptee = Context.getCanonicalType(rhptee); 3611 3612 AssignConvertType ConvTy = Compatible; 3613 3614 // C99 6.5.16.1p1: This following citation is common to constraints 3615 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3616 // qualifiers of the type *pointed to* by the right; 3617 // FIXME: Handle ExtQualType 3618 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3619 ConvTy = CompatiblePointerDiscardsQualifiers; 3620 3621 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3622 // incomplete type and the other is a pointer to a qualified or unqualified 3623 // version of void... 3624 if (lhptee->isVoidType()) { 3625 if (rhptee->isIncompleteOrObjectType()) 3626 return ConvTy; 3627 3628 // As an extension, we allow cast to/from void* to function pointer. 3629 assert(rhptee->isFunctionType()); 3630 return FunctionVoidPointer; 3631 } 3632 3633 if (rhptee->isVoidType()) { 3634 if (lhptee->isIncompleteOrObjectType()) 3635 return ConvTy; 3636 3637 // As an extension, we allow cast to/from void* to function pointer. 3638 assert(lhptee->isFunctionType()); 3639 return FunctionVoidPointer; 3640 } 3641 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3642 // unqualified versions of compatible types, ... 3643 lhptee = lhptee.getUnqualifiedType(); 3644 rhptee = rhptee.getUnqualifiedType(); 3645 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3646 // Check if the pointee types are compatible ignoring the sign. 3647 // We explicitly check for char so that we catch "char" vs 3648 // "unsigned char" on systems where "char" is unsigned. 3649 if (lhptee->isCharType()) { 3650 lhptee = Context.UnsignedCharTy; 3651 } else if (lhptee->isSignedIntegerType()) { 3652 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3653 } 3654 if (rhptee->isCharType()) { 3655 rhptee = Context.UnsignedCharTy; 3656 } else if (rhptee->isSignedIntegerType()) { 3657 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3658 } 3659 if (lhptee == rhptee) { 3660 // Types are compatible ignoring the sign. Qualifier incompatibility 3661 // takes priority over sign incompatibility because the sign 3662 // warning can be disabled. 3663 if (ConvTy != Compatible) 3664 return ConvTy; 3665 return IncompatiblePointerSign; 3666 } 3667 // General pointer incompatibility takes priority over qualifiers. 3668 return IncompatiblePointer; 3669 } 3670 return ConvTy; 3671} 3672 3673/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3674/// block pointer types are compatible or whether a block and normal pointer 3675/// are compatible. It is more restrict than comparing two function pointer 3676// types. 3677Sema::AssignConvertType 3678Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3679 QualType rhsType) { 3680 QualType lhptee, rhptee; 3681 3682 // get the "pointed to" type (ignoring qualifiers at the top level) 3683 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3684 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3685 3686 // make sure we operate on the canonical type 3687 lhptee = Context.getCanonicalType(lhptee); 3688 rhptee = Context.getCanonicalType(rhptee); 3689 3690 AssignConvertType ConvTy = Compatible; 3691 3692 // For blocks we enforce that qualifiers are identical. 3693 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3694 ConvTy = CompatiblePointerDiscardsQualifiers; 3695 3696 if (!Context.typesAreCompatible(lhptee, rhptee)) 3697 return IncompatibleBlockPointer; 3698 return ConvTy; 3699} 3700 3701/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3702/// has code to accommodate several GCC extensions when type checking 3703/// pointers. Here are some objectionable examples that GCC considers warnings: 3704/// 3705/// int a, *pint; 3706/// short *pshort; 3707/// struct foo *pfoo; 3708/// 3709/// pint = pshort; // warning: assignment from incompatible pointer type 3710/// a = pint; // warning: assignment makes integer from pointer without a cast 3711/// pint = a; // warning: assignment makes pointer from integer without a cast 3712/// pint = pfoo; // warning: assignment from incompatible pointer type 3713/// 3714/// As a result, the code for dealing with pointers is more complex than the 3715/// C99 spec dictates. 3716/// 3717Sema::AssignConvertType 3718Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3719 // Get canonical types. We're not formatting these types, just comparing 3720 // them. 3721 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3722 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3723 3724 if (lhsType == rhsType) 3725 return Compatible; // Common case: fast path an exact match. 3726 3727 if ((lhsType->isObjCClassType() && 3728 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3729 (rhsType->isObjCClassType() && 3730 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3731 return Compatible; 3732 } 3733 3734 // If the left-hand side is a reference type, then we are in a 3735 // (rare!) case where we've allowed the use of references in C, 3736 // e.g., as a parameter type in a built-in function. In this case, 3737 // just make sure that the type referenced is compatible with the 3738 // right-hand side type. The caller is responsible for adjusting 3739 // lhsType so that the resulting expression does not have reference 3740 // type. 3741 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3742 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3743 return Compatible; 3744 return Incompatible; 3745 } 3746 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3747 // to the same ExtVector type. 3748 if (lhsType->isExtVectorType()) { 3749 if (rhsType->isExtVectorType()) 3750 return lhsType == rhsType ? Compatible : Incompatible; 3751 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3752 return Compatible; 3753 } 3754 3755 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3756 // If we are allowing lax vector conversions, and LHS and RHS are both 3757 // vectors, the total size only needs to be the same. This is a bitcast; 3758 // no bits are changed but the result type is different. 3759 if (getLangOptions().LaxVectorConversions && 3760 lhsType->isVectorType() && rhsType->isVectorType()) { 3761 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3762 return IncompatibleVectors; 3763 } 3764 return Incompatible; 3765 } 3766 3767 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3768 return Compatible; 3769 3770 if (isa<PointerType>(lhsType)) { 3771 if (rhsType->isIntegerType()) 3772 return IntToPointer; 3773 3774 if (isa<PointerType>(rhsType)) 3775 return CheckPointerTypesForAssignment(lhsType, rhsType); 3776 3777 // In general, C pointers are not compatible with ObjC object pointers. 3778 if (isa<ObjCObjectPointerType>(rhsType)) { 3779 if (lhsType->isVoidPointerType()) // an exception to the rule. 3780 return Compatible; 3781 return IncompatiblePointer; 3782 } 3783 if (rhsType->getAs<BlockPointerType>()) { 3784 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3785 return Compatible; 3786 3787 // Treat block pointers as objects. 3788 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3789 return Compatible; 3790 } 3791 return Incompatible; 3792 } 3793 3794 if (isa<BlockPointerType>(lhsType)) { 3795 if (rhsType->isIntegerType()) 3796 return IntToBlockPointer; 3797 3798 // Treat block pointers as objects. 3799 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3800 return Compatible; 3801 3802 if (rhsType->isBlockPointerType()) 3803 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3804 3805 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3806 if (RHSPT->getPointeeType()->isVoidType()) 3807 return Compatible; 3808 } 3809 return Incompatible; 3810 } 3811 3812 if (isa<ObjCObjectPointerType>(lhsType)) { 3813 if (rhsType->isIntegerType()) 3814 return IntToPointer; 3815 3816 // In general, C pointers are not compatible with ObjC object pointers. 3817 if (isa<PointerType>(rhsType)) { 3818 if (rhsType->isVoidPointerType()) // an exception to the rule. 3819 return Compatible; 3820 return IncompatiblePointer; 3821 } 3822 if (rhsType->isObjCObjectPointerType()) { 3823 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3824 return Compatible; 3825 if (Context.typesAreCompatible(lhsType, rhsType)) 3826 return Compatible; 3827 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3828 return IncompatibleObjCQualifiedId; 3829 return IncompatiblePointer; 3830 } 3831 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3832 if (RHSPT->getPointeeType()->isVoidType()) 3833 return Compatible; 3834 } 3835 // Treat block pointers as objects. 3836 if (rhsType->isBlockPointerType()) 3837 return Compatible; 3838 return Incompatible; 3839 } 3840 if (isa<PointerType>(rhsType)) { 3841 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3842 if (lhsType == Context.BoolTy) 3843 return Compatible; 3844 3845 if (lhsType->isIntegerType()) 3846 return PointerToInt; 3847 3848 if (isa<PointerType>(lhsType)) 3849 return CheckPointerTypesForAssignment(lhsType, rhsType); 3850 3851 if (isa<BlockPointerType>(lhsType) && 3852 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3853 return Compatible; 3854 return Incompatible; 3855 } 3856 if (isa<ObjCObjectPointerType>(rhsType)) { 3857 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3858 if (lhsType == Context.BoolTy) 3859 return Compatible; 3860 3861 if (lhsType->isIntegerType()) 3862 return PointerToInt; 3863 3864 // In general, C pointers are not compatible with ObjC object pointers. 3865 if (isa<PointerType>(lhsType)) { 3866 if (lhsType->isVoidPointerType()) // an exception to the rule. 3867 return Compatible; 3868 return IncompatiblePointer; 3869 } 3870 if (isa<BlockPointerType>(lhsType) && 3871 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3872 return Compatible; 3873 return Incompatible; 3874 } 3875 3876 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3877 if (Context.typesAreCompatible(lhsType, rhsType)) 3878 return Compatible; 3879 } 3880 return Incompatible; 3881} 3882 3883/// \brief Constructs a transparent union from an expression that is 3884/// used to initialize the transparent union. 3885static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3886 QualType UnionType, FieldDecl *Field) { 3887 // Build an initializer list that designates the appropriate member 3888 // of the transparent union. 3889 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3890 &E, 1, 3891 SourceLocation()); 3892 Initializer->setType(UnionType); 3893 Initializer->setInitializedFieldInUnion(Field); 3894 3895 // Build a compound literal constructing a value of the transparent 3896 // union type from this initializer list. 3897 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3898 false); 3899} 3900 3901Sema::AssignConvertType 3902Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3903 QualType FromType = rExpr->getType(); 3904 3905 // If the ArgType is a Union type, we want to handle a potential 3906 // transparent_union GCC extension. 3907 const RecordType *UT = ArgType->getAsUnionType(); 3908 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3909 return Incompatible; 3910 3911 // The field to initialize within the transparent union. 3912 RecordDecl *UD = UT->getDecl(); 3913 FieldDecl *InitField = 0; 3914 // It's compatible if the expression matches any of the fields. 3915 for (RecordDecl::field_iterator it = UD->field_begin(), 3916 itend = UD->field_end(); 3917 it != itend; ++it) { 3918 if (it->getType()->isPointerType()) { 3919 // If the transparent union contains a pointer type, we allow: 3920 // 1) void pointer 3921 // 2) null pointer constant 3922 if (FromType->isPointerType()) 3923 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 3924 ImpCastExprToType(rExpr, it->getType()); 3925 InitField = *it; 3926 break; 3927 } 3928 3929 if (rExpr->isNullPointerConstant(Context)) { 3930 ImpCastExprToType(rExpr, it->getType()); 3931 InitField = *it; 3932 break; 3933 } 3934 } 3935 3936 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3937 == Compatible) { 3938 InitField = *it; 3939 break; 3940 } 3941 } 3942 3943 if (!InitField) 3944 return Incompatible; 3945 3946 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3947 return Compatible; 3948} 3949 3950Sema::AssignConvertType 3951Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3952 if (getLangOptions().CPlusPlus) { 3953 if (!lhsType->isRecordType()) { 3954 // C++ 5.17p3: If the left operand is not of class type, the 3955 // expression is implicitly converted (C++ 4) to the 3956 // cv-unqualified type of the left operand. 3957 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3958 "assigning")) 3959 return Incompatible; 3960 return Compatible; 3961 } 3962 3963 // FIXME: Currently, we fall through and treat C++ classes like C 3964 // structures. 3965 } 3966 3967 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3968 // a null pointer constant. 3969 if ((lhsType->isPointerType() || 3970 lhsType->isObjCObjectPointerType() || 3971 lhsType->isBlockPointerType()) 3972 && rExpr->isNullPointerConstant(Context)) { 3973 ImpCastExprToType(rExpr, lhsType); 3974 return Compatible; 3975 } 3976 3977 // This check seems unnatural, however it is necessary to ensure the proper 3978 // conversion of functions/arrays. If the conversion were done for all 3979 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3980 // expressions that surpress this implicit conversion (&, sizeof). 3981 // 3982 // Suppress this for references: C++ 8.5.3p5. 3983 if (!lhsType->isReferenceType()) 3984 DefaultFunctionArrayConversion(rExpr); 3985 3986 Sema::AssignConvertType result = 3987 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3988 3989 // C99 6.5.16.1p2: The value of the right operand is converted to the 3990 // type of the assignment expression. 3991 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3992 // so that we can use references in built-in functions even in C. 3993 // The getNonReferenceType() call makes sure that the resulting expression 3994 // does not have reference type. 3995 if (result != Incompatible && rExpr->getType() != lhsType) 3996 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3997 return result; 3998} 3999 4000QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 4001 Diag(Loc, diag::err_typecheck_invalid_operands) 4002 << lex->getType() << rex->getType() 4003 << lex->getSourceRange() << rex->getSourceRange(); 4004 return QualType(); 4005} 4006 4007inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 4008 Expr *&rex) { 4009 // For conversion purposes, we ignore any qualifiers. 4010 // For example, "const float" and "float" are equivalent. 4011 QualType lhsType = 4012 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 4013 QualType rhsType = 4014 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 4015 4016 // If the vector types are identical, return. 4017 if (lhsType == rhsType) 4018 return lhsType; 4019 4020 // Handle the case of a vector & extvector type of the same size and element 4021 // type. It would be nice if we only had one vector type someday. 4022 if (getLangOptions().LaxVectorConversions) { 4023 // FIXME: Should we warn here? 4024 if (const VectorType *LV = lhsType->getAsVectorType()) { 4025 if (const VectorType *RV = rhsType->getAsVectorType()) 4026 if (LV->getElementType() == RV->getElementType() && 4027 LV->getNumElements() == RV->getNumElements()) { 4028 return lhsType->isExtVectorType() ? lhsType : rhsType; 4029 } 4030 } 4031 } 4032 4033 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 4034 // swap back (so that we don't reverse the inputs to a subtract, for instance. 4035 bool swapped = false; 4036 if (rhsType->isExtVectorType()) { 4037 swapped = true; 4038 std::swap(rex, lex); 4039 std::swap(rhsType, lhsType); 4040 } 4041 4042 // Handle the case of an ext vector and scalar. 4043 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 4044 QualType EltTy = LV->getElementType(); 4045 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 4046 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 4047 ImpCastExprToType(rex, lhsType); 4048 if (swapped) std::swap(rex, lex); 4049 return lhsType; 4050 } 4051 } 4052 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 4053 rhsType->isRealFloatingType()) { 4054 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 4055 ImpCastExprToType(rex, lhsType); 4056 if (swapped) std::swap(rex, lex); 4057 return lhsType; 4058 } 4059 } 4060 } 4061 4062 // Vectors of different size or scalar and non-ext-vector are errors. 4063 Diag(Loc, diag::err_typecheck_vector_not_convertable) 4064 << lex->getType() << rex->getType() 4065 << lex->getSourceRange() << rex->getSourceRange(); 4066 return QualType(); 4067} 4068 4069inline QualType Sema::CheckMultiplyDivideOperands( 4070 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4071 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4072 return CheckVectorOperands(Loc, lex, rex); 4073 4074 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4075 4076 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4077 return compType; 4078 return InvalidOperands(Loc, lex, rex); 4079} 4080 4081inline QualType Sema::CheckRemainderOperands( 4082 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4083 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4084 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4085 return CheckVectorOperands(Loc, lex, rex); 4086 return InvalidOperands(Loc, lex, rex); 4087 } 4088 4089 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4090 4091 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4092 return compType; 4093 return InvalidOperands(Loc, lex, rex); 4094} 4095 4096inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4097 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) { 4098 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4099 QualType compType = CheckVectorOperands(Loc, lex, rex); 4100 if (CompLHSTy) *CompLHSTy = compType; 4101 return compType; 4102 } 4103 4104 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4105 4106 // handle the common case first (both operands are arithmetic). 4107 if (lex->getType()->isArithmeticType() && 4108 rex->getType()->isArithmeticType()) { 4109 if (CompLHSTy) *CompLHSTy = compType; 4110 return compType; 4111 } 4112 4113 // Put any potential pointer into PExp 4114 Expr* PExp = lex, *IExp = rex; 4115 if (IExp->getType()->isAnyPointerType()) 4116 std::swap(PExp, IExp); 4117 4118 if (PExp->getType()->isAnyPointerType()) { 4119 4120 if (IExp->getType()->isIntegerType()) { 4121 QualType PointeeTy = PExp->getType()->getPointeeType(); 4122 4123 // Check for arithmetic on pointers to incomplete types. 4124 if (PointeeTy->isVoidType()) { 4125 if (getLangOptions().CPlusPlus) { 4126 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4127 << lex->getSourceRange() << rex->getSourceRange(); 4128 return QualType(); 4129 } 4130 4131 // GNU extension: arithmetic on pointer to void 4132 Diag(Loc, diag::ext_gnu_void_ptr) 4133 << lex->getSourceRange() << rex->getSourceRange(); 4134 } else if (PointeeTy->isFunctionType()) { 4135 if (getLangOptions().CPlusPlus) { 4136 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4137 << lex->getType() << lex->getSourceRange(); 4138 return QualType(); 4139 } 4140 4141 // GNU extension: arithmetic on pointer to function 4142 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4143 << lex->getType() << lex->getSourceRange(); 4144 } else { 4145 // Check if we require a complete type. 4146 if (((PExp->getType()->isPointerType() && 4147 !PExp->getType()->isDependentType()) || 4148 PExp->getType()->isObjCObjectPointerType()) && 4149 RequireCompleteType(Loc, PointeeTy, 4150 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4151 << PExp->getSourceRange() 4152 << PExp->getType())) 4153 return QualType(); 4154 } 4155 // Diagnose bad cases where we step over interface counts. 4156 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4157 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4158 << PointeeTy << PExp->getSourceRange(); 4159 return QualType(); 4160 } 4161 4162 if (CompLHSTy) { 4163 QualType LHSTy = Context.isPromotableBitField(lex); 4164 if (LHSTy.isNull()) { 4165 LHSTy = lex->getType(); 4166 if (LHSTy->isPromotableIntegerType()) 4167 LHSTy = Context.getPromotedIntegerType(LHSTy); 4168 } 4169 *CompLHSTy = LHSTy; 4170 } 4171 return PExp->getType(); 4172 } 4173 } 4174 4175 return InvalidOperands(Loc, lex, rex); 4176} 4177 4178// C99 6.5.6 4179QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4180 SourceLocation Loc, QualType* CompLHSTy) { 4181 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4182 QualType compType = CheckVectorOperands(Loc, lex, rex); 4183 if (CompLHSTy) *CompLHSTy = compType; 4184 return compType; 4185 } 4186 4187 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4188 4189 // Enforce type constraints: C99 6.5.6p3. 4190 4191 // Handle the common case first (both operands are arithmetic). 4192 if (lex->getType()->isArithmeticType() 4193 && rex->getType()->isArithmeticType()) { 4194 if (CompLHSTy) *CompLHSTy = compType; 4195 return compType; 4196 } 4197 4198 // Either ptr - int or ptr - ptr. 4199 if (lex->getType()->isAnyPointerType()) { 4200 QualType lpointee = lex->getType()->getPointeeType(); 4201 4202 // The LHS must be an completely-defined object type. 4203 4204 bool ComplainAboutVoid = false; 4205 Expr *ComplainAboutFunc = 0; 4206 if (lpointee->isVoidType()) { 4207 if (getLangOptions().CPlusPlus) { 4208 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4209 << lex->getSourceRange() << rex->getSourceRange(); 4210 return QualType(); 4211 } 4212 4213 // GNU C extension: arithmetic on pointer to void 4214 ComplainAboutVoid = true; 4215 } else if (lpointee->isFunctionType()) { 4216 if (getLangOptions().CPlusPlus) { 4217 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4218 << lex->getType() << lex->getSourceRange(); 4219 return QualType(); 4220 } 4221 4222 // GNU C extension: arithmetic on pointer to function 4223 ComplainAboutFunc = lex; 4224 } else if (!lpointee->isDependentType() && 4225 RequireCompleteType(Loc, lpointee, 4226 PDiag(diag::err_typecheck_sub_ptr_object) 4227 << lex->getSourceRange() 4228 << lex->getType())) 4229 return QualType(); 4230 4231 // Diagnose bad cases where we step over interface counts. 4232 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4233 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4234 << lpointee << lex->getSourceRange(); 4235 return QualType(); 4236 } 4237 4238 // The result type of a pointer-int computation is the pointer type. 4239 if (rex->getType()->isIntegerType()) { 4240 if (ComplainAboutVoid) 4241 Diag(Loc, diag::ext_gnu_void_ptr) 4242 << lex->getSourceRange() << rex->getSourceRange(); 4243 if (ComplainAboutFunc) 4244 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4245 << ComplainAboutFunc->getType() 4246 << ComplainAboutFunc->getSourceRange(); 4247 4248 if (CompLHSTy) *CompLHSTy = lex->getType(); 4249 return lex->getType(); 4250 } 4251 4252 // Handle pointer-pointer subtractions. 4253 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4254 QualType rpointee = RHSPTy->getPointeeType(); 4255 4256 // RHS must be a completely-type object type. 4257 // Handle the GNU void* extension. 4258 if (rpointee->isVoidType()) { 4259 if (getLangOptions().CPlusPlus) { 4260 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4261 << lex->getSourceRange() << rex->getSourceRange(); 4262 return QualType(); 4263 } 4264 4265 ComplainAboutVoid = true; 4266 } else if (rpointee->isFunctionType()) { 4267 if (getLangOptions().CPlusPlus) { 4268 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4269 << rex->getType() << rex->getSourceRange(); 4270 return QualType(); 4271 } 4272 4273 // GNU extension: arithmetic on pointer to function 4274 if (!ComplainAboutFunc) 4275 ComplainAboutFunc = rex; 4276 } else if (!rpointee->isDependentType() && 4277 RequireCompleteType(Loc, rpointee, 4278 PDiag(diag::err_typecheck_sub_ptr_object) 4279 << rex->getSourceRange() 4280 << rex->getType())) 4281 return QualType(); 4282 4283 if (getLangOptions().CPlusPlus) { 4284 // Pointee types must be the same: C++ [expr.add] 4285 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4286 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4287 << lex->getType() << rex->getType() 4288 << lex->getSourceRange() << rex->getSourceRange(); 4289 return QualType(); 4290 } 4291 } else { 4292 // Pointee types must be compatible C99 6.5.6p3 4293 if (!Context.typesAreCompatible( 4294 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4295 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4296 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4297 << lex->getType() << rex->getType() 4298 << lex->getSourceRange() << rex->getSourceRange(); 4299 return QualType(); 4300 } 4301 } 4302 4303 if (ComplainAboutVoid) 4304 Diag(Loc, diag::ext_gnu_void_ptr) 4305 << lex->getSourceRange() << rex->getSourceRange(); 4306 if (ComplainAboutFunc) 4307 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4308 << ComplainAboutFunc->getType() 4309 << ComplainAboutFunc->getSourceRange(); 4310 4311 if (CompLHSTy) *CompLHSTy = lex->getType(); 4312 return Context.getPointerDiffType(); 4313 } 4314 } 4315 4316 return InvalidOperands(Loc, lex, rex); 4317} 4318 4319// C99 6.5.7 4320QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4321 bool isCompAssign) { 4322 // C99 6.5.7p2: Each of the operands shall have integer type. 4323 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4324 return InvalidOperands(Loc, lex, rex); 4325 4326 // Shifts don't perform usual arithmetic conversions, they just do integer 4327 // promotions on each operand. C99 6.5.7p3 4328 QualType LHSTy = Context.isPromotableBitField(lex); 4329 if (LHSTy.isNull()) { 4330 LHSTy = lex->getType(); 4331 if (LHSTy->isPromotableIntegerType()) 4332 LHSTy = Context.getPromotedIntegerType(LHSTy); 4333 } 4334 if (!isCompAssign) 4335 ImpCastExprToType(lex, LHSTy); 4336 4337 UsualUnaryConversions(rex); 4338 4339 // Sanity-check shift operands 4340 llvm::APSInt Right; 4341 // Check right/shifter operand 4342 if (rex->isIntegerConstantExpr(Right, Context)) { 4343 if (Right.isNegative()) 4344 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4345 else { 4346 llvm::APInt LeftBits(Right.getBitWidth(), 4347 Context.getTypeSize(lex->getType())); 4348 if (Right.uge(LeftBits)) 4349 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4350 } 4351 } 4352 4353 // "The type of the result is that of the promoted left operand." 4354 return LHSTy; 4355} 4356 4357// C99 6.5.8, C++ [expr.rel] 4358QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4359 unsigned OpaqueOpc, bool isRelational) { 4360 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4361 4362 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4363 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4364 4365 // C99 6.5.8p3 / C99 6.5.9p4 4366 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4367 UsualArithmeticConversions(lex, rex); 4368 else { 4369 UsualUnaryConversions(lex); 4370 UsualUnaryConversions(rex); 4371 } 4372 QualType lType = lex->getType(); 4373 QualType rType = rex->getType(); 4374 4375 if (!lType->isFloatingType() 4376 && !(lType->isBlockPointerType() && isRelational)) { 4377 // For non-floating point types, check for self-comparisons of the form 4378 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4379 // often indicate logic errors in the program. 4380 // NOTE: Don't warn about comparisons of enum constants. These can arise 4381 // from macro expansions, and are usually quite deliberate. 4382 Expr *LHSStripped = lex->IgnoreParens(); 4383 Expr *RHSStripped = rex->IgnoreParens(); 4384 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4385 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4386 if (DRL->getDecl() == DRR->getDecl() && 4387 !isa<EnumConstantDecl>(DRL->getDecl())) 4388 Diag(Loc, diag::warn_selfcomparison); 4389 4390 if (isa<CastExpr>(LHSStripped)) 4391 LHSStripped = LHSStripped->IgnoreParenCasts(); 4392 if (isa<CastExpr>(RHSStripped)) 4393 RHSStripped = RHSStripped->IgnoreParenCasts(); 4394 4395 // Warn about comparisons against a string constant (unless the other 4396 // operand is null), the user probably wants strcmp. 4397 Expr *literalString = 0; 4398 Expr *literalStringStripped = 0; 4399 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4400 !RHSStripped->isNullPointerConstant(Context)) { 4401 literalString = lex; 4402 literalStringStripped = LHSStripped; 4403 } else if ((isa<StringLiteral>(RHSStripped) || 4404 isa<ObjCEncodeExpr>(RHSStripped)) && 4405 !LHSStripped->isNullPointerConstant(Context)) { 4406 literalString = rex; 4407 literalStringStripped = RHSStripped; 4408 } 4409 4410 if (literalString) { 4411 std::string resultComparison; 4412 switch (Opc) { 4413 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4414 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4415 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4416 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4417 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4418 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4419 default: assert(false && "Invalid comparison operator"); 4420 } 4421 Diag(Loc, diag::warn_stringcompare) 4422 << isa<ObjCEncodeExpr>(literalStringStripped) 4423 << literalString->getSourceRange() 4424 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4425 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4426 "strcmp(") 4427 << CodeModificationHint::CreateInsertion( 4428 PP.getLocForEndOfToken(rex->getLocEnd()), 4429 resultComparison); 4430 } 4431 } 4432 4433 // The result of comparisons is 'bool' in C++, 'int' in C. 4434 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4435 4436 if (isRelational) { 4437 if (lType->isRealType() && rType->isRealType()) 4438 return ResultTy; 4439 } else { 4440 // Check for comparisons of floating point operands using != and ==. 4441 if (lType->isFloatingType()) { 4442 assert(rType->isFloatingType()); 4443 CheckFloatComparison(Loc,lex,rex); 4444 } 4445 4446 if (lType->isArithmeticType() && rType->isArithmeticType()) 4447 return ResultTy; 4448 } 4449 4450 bool LHSIsNull = lex->isNullPointerConstant(Context); 4451 bool RHSIsNull = rex->isNullPointerConstant(Context); 4452 4453 // All of the following pointer related warnings are GCC extensions, except 4454 // when handling null pointer constants. One day, we can consider making them 4455 // errors (when -pedantic-errors is enabled). 4456 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4457 QualType LCanPointeeTy = 4458 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4459 QualType RCanPointeeTy = 4460 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4461 4462 if (getLangOptions().CPlusPlus) { 4463 if (LCanPointeeTy == RCanPointeeTy) 4464 return ResultTy; 4465 4466 // C++ [expr.rel]p2: 4467 // [...] Pointer conversions (4.10) and qualification 4468 // conversions (4.4) are performed on pointer operands (or on 4469 // a pointer operand and a null pointer constant) to bring 4470 // them to their composite pointer type. [...] 4471 // 4472 // C++ [expr.eq]p1 uses the same notion for (in)equality 4473 // comparisons of pointers. 4474 QualType T = FindCompositePointerType(lex, rex); 4475 if (T.isNull()) { 4476 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4477 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4478 return QualType(); 4479 } 4480 4481 ImpCastExprToType(lex, T); 4482 ImpCastExprToType(rex, T); 4483 return ResultTy; 4484 } 4485 // C99 6.5.9p2 and C99 6.5.8p2 4486 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4487 RCanPointeeTy.getUnqualifiedType())) { 4488 // Valid unless a relational comparison of function pointers 4489 if (isRelational && LCanPointeeTy->isFunctionType()) { 4490 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4491 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4492 } 4493 } else if (!isRelational && 4494 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4495 // Valid unless comparison between non-null pointer and function pointer 4496 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4497 && !LHSIsNull && !RHSIsNull) { 4498 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4499 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4500 } 4501 } else { 4502 // Invalid 4503 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4504 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4505 } 4506 if (LCanPointeeTy != RCanPointeeTy) 4507 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4508 return ResultTy; 4509 } 4510 4511 if (getLangOptions().CPlusPlus) { 4512 // Comparison of pointers with null pointer constants and equality 4513 // comparisons of member pointers to null pointer constants. 4514 if (RHSIsNull && 4515 (lType->isPointerType() || 4516 (!isRelational && lType->isMemberPointerType()))) { 4517 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4518 return ResultTy; 4519 } 4520 if (LHSIsNull && 4521 (rType->isPointerType() || 4522 (!isRelational && rType->isMemberPointerType()))) { 4523 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4524 return ResultTy; 4525 } 4526 4527 // Comparison of member pointers. 4528 if (!isRelational && 4529 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4530 // C++ [expr.eq]p2: 4531 // In addition, pointers to members can be compared, or a pointer to 4532 // member and a null pointer constant. Pointer to member conversions 4533 // (4.11) and qualification conversions (4.4) are performed to bring 4534 // them to a common type. If one operand is a null pointer constant, 4535 // the common type is the type of the other operand. Otherwise, the 4536 // common type is a pointer to member type similar (4.4) to the type 4537 // of one of the operands, with a cv-qualification signature (4.4) 4538 // that is the union of the cv-qualification signatures of the operand 4539 // types. 4540 QualType T = FindCompositePointerType(lex, rex); 4541 if (T.isNull()) { 4542 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4543 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4544 return QualType(); 4545 } 4546 4547 ImpCastExprToType(lex, T); 4548 ImpCastExprToType(rex, T); 4549 return ResultTy; 4550 } 4551 4552 // Comparison of nullptr_t with itself. 4553 if (lType->isNullPtrType() && rType->isNullPtrType()) 4554 return ResultTy; 4555 } 4556 4557 // Handle block pointer types. 4558 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4559 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4560 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4561 4562 if (!LHSIsNull && !RHSIsNull && 4563 !Context.typesAreCompatible(lpointee, rpointee)) { 4564 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4565 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4566 } 4567 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4568 return ResultTy; 4569 } 4570 // Allow block pointers to be compared with null pointer constants. 4571 if (!isRelational 4572 && ((lType->isBlockPointerType() && rType->isPointerType()) 4573 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4574 if (!LHSIsNull && !RHSIsNull) { 4575 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4576 ->getPointeeType()->isVoidType()) 4577 || (lType->isPointerType() && lType->getAs<PointerType>() 4578 ->getPointeeType()->isVoidType()))) 4579 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4580 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4581 } 4582 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4583 return ResultTy; 4584 } 4585 4586 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4587 if (lType->isPointerType() || rType->isPointerType()) { 4588 const PointerType *LPT = lType->getAs<PointerType>(); 4589 const PointerType *RPT = rType->getAs<PointerType>(); 4590 bool LPtrToVoid = LPT ? 4591 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4592 bool RPtrToVoid = RPT ? 4593 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4594 4595 if (!LPtrToVoid && !RPtrToVoid && 4596 !Context.typesAreCompatible(lType, rType)) { 4597 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4598 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4599 } 4600 ImpCastExprToType(rex, lType); 4601 return ResultTy; 4602 } 4603 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4604 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4605 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4606 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4607 ImpCastExprToType(rex, lType); 4608 return ResultTy; 4609 } 4610 } 4611 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4612 unsigned DiagID = 0; 4613 if (RHSIsNull) { 4614 if (isRelational) 4615 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4616 } else if (isRelational) 4617 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4618 else 4619 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4620 4621 if (DiagID) { 4622 Diag(Loc, DiagID) 4623 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4624 } 4625 ImpCastExprToType(rex, lType); // promote the integer to pointer 4626 return ResultTy; 4627 } 4628 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4629 unsigned DiagID = 0; 4630 if (LHSIsNull) { 4631 if (isRelational) 4632 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4633 } else if (isRelational) 4634 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4635 else 4636 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4637 4638 if (DiagID) { 4639 Diag(Loc, DiagID) 4640 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4641 } 4642 ImpCastExprToType(lex, rType); // promote the integer to pointer 4643 return ResultTy; 4644 } 4645 // Handle block pointers. 4646 if (!isRelational && RHSIsNull 4647 && lType->isBlockPointerType() && rType->isIntegerType()) { 4648 ImpCastExprToType(rex, lType); // promote the integer to pointer 4649 return ResultTy; 4650 } 4651 if (!isRelational && LHSIsNull 4652 && lType->isIntegerType() && rType->isBlockPointerType()) { 4653 ImpCastExprToType(lex, rType); // promote the integer to pointer 4654 return ResultTy; 4655 } 4656 return InvalidOperands(Loc, lex, rex); 4657} 4658 4659/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4660/// operates on extended vector types. Instead of producing an IntTy result, 4661/// like a scalar comparison, a vector comparison produces a vector of integer 4662/// types. 4663QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4664 SourceLocation Loc, 4665 bool isRelational) { 4666 // Check to make sure we're operating on vectors of the same type and width, 4667 // Allowing one side to be a scalar of element type. 4668 QualType vType = CheckVectorOperands(Loc, lex, rex); 4669 if (vType.isNull()) 4670 return vType; 4671 4672 QualType lType = lex->getType(); 4673 QualType rType = rex->getType(); 4674 4675 // For non-floating point types, check for self-comparisons of the form 4676 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4677 // often indicate logic errors in the program. 4678 if (!lType->isFloatingType()) { 4679 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4680 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4681 if (DRL->getDecl() == DRR->getDecl()) 4682 Diag(Loc, diag::warn_selfcomparison); 4683 } 4684 4685 // Check for comparisons of floating point operands using != and ==. 4686 if (!isRelational && lType->isFloatingType()) { 4687 assert (rType->isFloatingType()); 4688 CheckFloatComparison(Loc,lex,rex); 4689 } 4690 4691 // Return the type for the comparison, which is the same as vector type for 4692 // integer vectors, or an integer type of identical size and number of 4693 // elements for floating point vectors. 4694 if (lType->isIntegerType()) 4695 return lType; 4696 4697 const VectorType *VTy = lType->getAsVectorType(); 4698 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4699 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4700 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4701 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4702 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4703 4704 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4705 "Unhandled vector element size in vector compare"); 4706 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4707} 4708 4709inline QualType Sema::CheckBitwiseOperands( 4710 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4711 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4712 return CheckVectorOperands(Loc, lex, rex); 4713 4714 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4715 4716 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4717 return compType; 4718 return InvalidOperands(Loc, lex, rex); 4719} 4720 4721inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4722 Expr *&lex, Expr *&rex, SourceLocation Loc) { 4723 UsualUnaryConversions(lex); 4724 UsualUnaryConversions(rex); 4725 4726 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4727 return Context.IntTy; 4728 return InvalidOperands(Loc, lex, rex); 4729} 4730 4731/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4732/// is a read-only property; return true if so. A readonly property expression 4733/// depends on various declarations and thus must be treated specially. 4734/// 4735static bool IsReadonlyProperty(Expr *E, Sema &S) { 4736 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4737 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4738 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4739 QualType BaseType = PropExpr->getBase()->getType(); 4740 if (const ObjCObjectPointerType *OPT = 4741 BaseType->getAsObjCInterfacePointerType()) 4742 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4743 if (S.isPropertyReadonly(PDecl, IFace)) 4744 return true; 4745 } 4746 } 4747 return false; 4748} 4749 4750/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4751/// emit an error and return true. If so, return false. 4752static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4753 SourceLocation OrigLoc = Loc; 4754 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4755 &Loc); 4756 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4757 IsLV = Expr::MLV_ReadonlyProperty; 4758 if (IsLV == Expr::MLV_Valid) 4759 return false; 4760 4761 unsigned Diag = 0; 4762 bool NeedType = false; 4763 switch (IsLV) { // C99 6.5.16p2 4764 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4765 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4766 case Expr::MLV_ArrayType: 4767 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4768 NeedType = true; 4769 break; 4770 case Expr::MLV_NotObjectType: 4771 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4772 NeedType = true; 4773 break; 4774 case Expr::MLV_LValueCast: 4775 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4776 break; 4777 case Expr::MLV_InvalidExpression: 4778 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4779 break; 4780 case Expr::MLV_IncompleteType: 4781 case Expr::MLV_IncompleteVoidType: 4782 return S.RequireCompleteType(Loc, E->getType(), 4783 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4784 << E->getSourceRange()); 4785 case Expr::MLV_DuplicateVectorComponents: 4786 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4787 break; 4788 case Expr::MLV_NotBlockQualified: 4789 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4790 break; 4791 case Expr::MLV_ReadonlyProperty: 4792 Diag = diag::error_readonly_property_assignment; 4793 break; 4794 case Expr::MLV_NoSetterProperty: 4795 Diag = diag::error_nosetter_property_assignment; 4796 break; 4797 } 4798 4799 SourceRange Assign; 4800 if (Loc != OrigLoc) 4801 Assign = SourceRange(OrigLoc, OrigLoc); 4802 if (NeedType) 4803 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4804 else 4805 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4806 return true; 4807} 4808 4809 4810 4811// C99 6.5.16.1 4812QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4813 SourceLocation Loc, 4814 QualType CompoundType) { 4815 // Verify that LHS is a modifiable lvalue, and emit error if not. 4816 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4817 return QualType(); 4818 4819 QualType LHSType = LHS->getType(); 4820 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4821 4822 AssignConvertType ConvTy; 4823 if (CompoundType.isNull()) { 4824 // Simple assignment "x = y". 4825 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4826 // Special case of NSObject attributes on c-style pointer types. 4827 if (ConvTy == IncompatiblePointer && 4828 ((Context.isObjCNSObjectType(LHSType) && 4829 RHSType->isObjCObjectPointerType()) || 4830 (Context.isObjCNSObjectType(RHSType) && 4831 LHSType->isObjCObjectPointerType()))) 4832 ConvTy = Compatible; 4833 4834 // If the RHS is a unary plus or minus, check to see if they = and + are 4835 // right next to each other. If so, the user may have typo'd "x =+ 4" 4836 // instead of "x += 4". 4837 Expr *RHSCheck = RHS; 4838 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4839 RHSCheck = ICE->getSubExpr(); 4840 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4841 if ((UO->getOpcode() == UnaryOperator::Plus || 4842 UO->getOpcode() == UnaryOperator::Minus) && 4843 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4844 // Only if the two operators are exactly adjacent. 4845 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4846 // And there is a space or other character before the subexpr of the 4847 // unary +/-. We don't want to warn on "x=-1". 4848 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4849 UO->getSubExpr()->getLocStart().isFileID()) { 4850 Diag(Loc, diag::warn_not_compound_assign) 4851 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4852 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4853 } 4854 } 4855 } else { 4856 // Compound assignment "x += y" 4857 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4858 } 4859 4860 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4861 RHS, "assigning")) 4862 return QualType(); 4863 4864 // C99 6.5.16p3: The type of an assignment expression is the type of the 4865 // left operand unless the left operand has qualified type, in which case 4866 // it is the unqualified version of the type of the left operand. 4867 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4868 // is converted to the type of the assignment expression (above). 4869 // C++ 5.17p1: the type of the assignment expression is that of its left 4870 // operand. 4871 return LHSType.getUnqualifiedType(); 4872} 4873 4874// C99 6.5.17 4875QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4876 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4877 DefaultFunctionArrayConversion(RHS); 4878 4879 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4880 // incomplete in C++). 4881 4882 return RHS->getType(); 4883} 4884 4885/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4886/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4887QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4888 bool isInc) { 4889 if (Op->isTypeDependent()) 4890 return Context.DependentTy; 4891 4892 QualType ResType = Op->getType(); 4893 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4894 4895 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4896 // Decrement of bool is not allowed. 4897 if (!isInc) { 4898 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4899 return QualType(); 4900 } 4901 // Increment of bool sets it to true, but is deprecated. 4902 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4903 } else if (ResType->isRealType()) { 4904 // OK! 4905 } else if (ResType->isAnyPointerType()) { 4906 QualType PointeeTy = ResType->getPointeeType(); 4907 4908 // C99 6.5.2.4p2, 6.5.6p2 4909 if (PointeeTy->isVoidType()) { 4910 if (getLangOptions().CPlusPlus) { 4911 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4912 << Op->getSourceRange(); 4913 return QualType(); 4914 } 4915 4916 // Pointer to void is a GNU extension in C. 4917 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4918 } else if (PointeeTy->isFunctionType()) { 4919 if (getLangOptions().CPlusPlus) { 4920 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4921 << Op->getType() << Op->getSourceRange(); 4922 return QualType(); 4923 } 4924 4925 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4926 << ResType << Op->getSourceRange(); 4927 } else if (RequireCompleteType(OpLoc, PointeeTy, 4928 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4929 << Op->getSourceRange() 4930 << ResType)) 4931 return QualType(); 4932 // Diagnose bad cases where we step over interface counts. 4933 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4934 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 4935 << PointeeTy << Op->getSourceRange(); 4936 return QualType(); 4937 } 4938 } else if (ResType->isComplexType()) { 4939 // C99 does not support ++/-- on complex types, we allow as an extension. 4940 Diag(OpLoc, diag::ext_integer_increment_complex) 4941 << ResType << Op->getSourceRange(); 4942 } else { 4943 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4944 << ResType << Op->getSourceRange(); 4945 return QualType(); 4946 } 4947 // At this point, we know we have a real, complex or pointer type. 4948 // Now make sure the operand is a modifiable lvalue. 4949 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4950 return QualType(); 4951 return ResType; 4952} 4953 4954/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4955/// This routine allows us to typecheck complex/recursive expressions 4956/// where the declaration is needed for type checking. We only need to 4957/// handle cases when the expression references a function designator 4958/// or is an lvalue. Here are some examples: 4959/// - &(x) => x 4960/// - &*****f => f for f a function designator. 4961/// - &s.xx => s 4962/// - &s.zz[1].yy -> s, if zz is an array 4963/// - *(x + 1) -> x, if x is an array 4964/// - &"123"[2] -> 0 4965/// - & __real__ x -> x 4966static NamedDecl *getPrimaryDecl(Expr *E) { 4967 switch (E->getStmtClass()) { 4968 case Stmt::DeclRefExprClass: 4969 case Stmt::QualifiedDeclRefExprClass: 4970 return cast<DeclRefExpr>(E)->getDecl(); 4971 case Stmt::MemberExprClass: 4972 // If this is an arrow operator, the address is an offset from 4973 // the base's value, so the object the base refers to is 4974 // irrelevant. 4975 if (cast<MemberExpr>(E)->isArrow()) 4976 return 0; 4977 // Otherwise, the expression refers to a part of the base 4978 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4979 case Stmt::ArraySubscriptExprClass: { 4980 // FIXME: This code shouldn't be necessary! We should catch the implicit 4981 // promotion of register arrays earlier. 4982 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4983 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4984 if (ICE->getSubExpr()->getType()->isArrayType()) 4985 return getPrimaryDecl(ICE->getSubExpr()); 4986 } 4987 return 0; 4988 } 4989 case Stmt::UnaryOperatorClass: { 4990 UnaryOperator *UO = cast<UnaryOperator>(E); 4991 4992 switch(UO->getOpcode()) { 4993 case UnaryOperator::Real: 4994 case UnaryOperator::Imag: 4995 case UnaryOperator::Extension: 4996 return getPrimaryDecl(UO->getSubExpr()); 4997 default: 4998 return 0; 4999 } 5000 } 5001 case Stmt::ParenExprClass: 5002 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 5003 case Stmt::ImplicitCastExprClass: 5004 // If the result of an implicit cast is an l-value, we care about 5005 // the sub-expression; otherwise, the result here doesn't matter. 5006 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 5007 default: 5008 return 0; 5009 } 5010} 5011 5012/// CheckAddressOfOperand - The operand of & must be either a function 5013/// designator or an lvalue designating an object. If it is an lvalue, the 5014/// object cannot be declared with storage class register or be a bit field. 5015/// Note: The usual conversions are *not* applied to the operand of the & 5016/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 5017/// In C++, the operand might be an overloaded function name, in which case 5018/// we allow the '&' but retain the overloaded-function type. 5019QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 5020 // Make sure to ignore parentheses in subsequent checks 5021 op = op->IgnoreParens(); 5022 5023 if (op->isTypeDependent()) 5024 return Context.DependentTy; 5025 5026 if (getLangOptions().C99) { 5027 // Implement C99-only parts of addressof rules. 5028 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 5029 if (uOp->getOpcode() == UnaryOperator::Deref) 5030 // Per C99 6.5.3.2, the address of a deref always returns a valid result 5031 // (assuming the deref expression is valid). 5032 return uOp->getSubExpr()->getType(); 5033 } 5034 // Technically, there should be a check for array subscript 5035 // expressions here, but the result of one is always an lvalue anyway. 5036 } 5037 NamedDecl *dcl = getPrimaryDecl(op); 5038 Expr::isLvalueResult lval = op->isLvalue(Context); 5039 5040 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 5041 // C99 6.5.3.2p1 5042 // The operand must be either an l-value or a function designator 5043 if (!op->getType()->isFunctionType()) { 5044 // FIXME: emit more specific diag... 5045 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 5046 << op->getSourceRange(); 5047 return QualType(); 5048 } 5049 } else if (op->getBitField()) { // C99 6.5.3.2p1 5050 // The operand cannot be a bit-field 5051 Diag(OpLoc, diag::err_typecheck_address_of) 5052 << "bit-field" << op->getSourceRange(); 5053 return QualType(); 5054 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 5055 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 5056 // The operand cannot be an element of a vector 5057 Diag(OpLoc, diag::err_typecheck_address_of) 5058 << "vector element" << op->getSourceRange(); 5059 return QualType(); 5060 } else if (isa<ObjCPropertyRefExpr>(op)) { 5061 // cannot take address of a property expression. 5062 Diag(OpLoc, diag::err_typecheck_address_of) 5063 << "property expression" << op->getSourceRange(); 5064 return QualType(); 5065 } else if (dcl) { // C99 6.5.3.2p1 5066 // We have an lvalue with a decl. Make sure the decl is not declared 5067 // with the register storage-class specifier. 5068 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 5069 if (vd->getStorageClass() == VarDecl::Register) { 5070 Diag(OpLoc, diag::err_typecheck_address_of) 5071 << "register variable" << op->getSourceRange(); 5072 return QualType(); 5073 } 5074 } else if (isa<OverloadedFunctionDecl>(dcl) || 5075 isa<FunctionTemplateDecl>(dcl)) { 5076 return Context.OverloadTy; 5077 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 5078 // Okay: we can take the address of a field. 5079 // Could be a pointer to member, though, if there is an explicit 5080 // scope qualifier for the class. 5081 if (isa<QualifiedDeclRefExpr>(op)) { 5082 DeclContext *Ctx = dcl->getDeclContext(); 5083 if (Ctx && Ctx->isRecord()) { 5084 if (FD->getType()->isReferenceType()) { 5085 Diag(OpLoc, 5086 diag::err_cannot_form_pointer_to_member_of_reference_type) 5087 << FD->getDeclName() << FD->getType(); 5088 return QualType(); 5089 } 5090 5091 return Context.getMemberPointerType(op->getType(), 5092 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5093 } 5094 } 5095 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5096 // Okay: we can take the address of a function. 5097 // As above. 5098 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 5099 return Context.getMemberPointerType(op->getType(), 5100 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5101 } else if (!isa<FunctionDecl>(dcl)) 5102 assert(0 && "Unknown/unexpected decl type"); 5103 } 5104 5105 if (lval == Expr::LV_IncompleteVoidType) { 5106 // Taking the address of a void variable is technically illegal, but we 5107 // allow it in cases which are otherwise valid. 5108 // Example: "extern void x; void* y = &x;". 5109 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5110 } 5111 5112 // If the operand has type "type", the result has type "pointer to type". 5113 return Context.getPointerType(op->getType()); 5114} 5115 5116QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5117 if (Op->isTypeDependent()) 5118 return Context.DependentTy; 5119 5120 UsualUnaryConversions(Op); 5121 QualType Ty = Op->getType(); 5122 5123 // Note that per both C89 and C99, this is always legal, even if ptype is an 5124 // incomplete type or void. It would be possible to warn about dereferencing 5125 // a void pointer, but it's completely well-defined, and such a warning is 5126 // unlikely to catch any mistakes. 5127 if (const PointerType *PT = Ty->getAs<PointerType>()) 5128 return PT->getPointeeType(); 5129 5130 if (const ObjCObjectPointerType *OPT = Ty->getAsObjCObjectPointerType()) 5131 return OPT->getPointeeType(); 5132 5133 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5134 << Ty << Op->getSourceRange(); 5135 return QualType(); 5136} 5137 5138static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5139 tok::TokenKind Kind) { 5140 BinaryOperator::Opcode Opc; 5141 switch (Kind) { 5142 default: assert(0 && "Unknown binop!"); 5143 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5144 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5145 case tok::star: Opc = BinaryOperator::Mul; break; 5146 case tok::slash: Opc = BinaryOperator::Div; break; 5147 case tok::percent: Opc = BinaryOperator::Rem; break; 5148 case tok::plus: Opc = BinaryOperator::Add; break; 5149 case tok::minus: Opc = BinaryOperator::Sub; break; 5150 case tok::lessless: Opc = BinaryOperator::Shl; break; 5151 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5152 case tok::lessequal: Opc = BinaryOperator::LE; break; 5153 case tok::less: Opc = BinaryOperator::LT; break; 5154 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5155 case tok::greater: Opc = BinaryOperator::GT; break; 5156 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5157 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5158 case tok::amp: Opc = BinaryOperator::And; break; 5159 case tok::caret: Opc = BinaryOperator::Xor; break; 5160 case tok::pipe: Opc = BinaryOperator::Or; break; 5161 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5162 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5163 case tok::equal: Opc = BinaryOperator::Assign; break; 5164 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5165 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5166 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5167 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5168 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5169 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5170 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5171 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5172 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5173 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5174 case tok::comma: Opc = BinaryOperator::Comma; break; 5175 } 5176 return Opc; 5177} 5178 5179static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5180 tok::TokenKind Kind) { 5181 UnaryOperator::Opcode Opc; 5182 switch (Kind) { 5183 default: assert(0 && "Unknown unary op!"); 5184 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5185 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5186 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5187 case tok::star: Opc = UnaryOperator::Deref; break; 5188 case tok::plus: Opc = UnaryOperator::Plus; break; 5189 case tok::minus: Opc = UnaryOperator::Minus; break; 5190 case tok::tilde: Opc = UnaryOperator::Not; break; 5191 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5192 case tok::kw___real: Opc = UnaryOperator::Real; break; 5193 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5194 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5195 } 5196 return Opc; 5197} 5198 5199/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5200/// operator @p Opc at location @c TokLoc. This routine only supports 5201/// built-in operations; ActOnBinOp handles overloaded operators. 5202Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5203 unsigned Op, 5204 Expr *lhs, Expr *rhs) { 5205 QualType ResultTy; // Result type of the binary operator. 5206 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5207 // The following two variables are used for compound assignment operators 5208 QualType CompLHSTy; // Type of LHS after promotions for computation 5209 QualType CompResultTy; // Type of computation result 5210 5211 switch (Opc) { 5212 case BinaryOperator::Assign: 5213 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5214 break; 5215 case BinaryOperator::PtrMemD: 5216 case BinaryOperator::PtrMemI: 5217 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5218 Opc == BinaryOperator::PtrMemI); 5219 break; 5220 case BinaryOperator::Mul: 5221 case BinaryOperator::Div: 5222 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5223 break; 5224 case BinaryOperator::Rem: 5225 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5226 break; 5227 case BinaryOperator::Add: 5228 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5229 break; 5230 case BinaryOperator::Sub: 5231 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5232 break; 5233 case BinaryOperator::Shl: 5234 case BinaryOperator::Shr: 5235 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5236 break; 5237 case BinaryOperator::LE: 5238 case BinaryOperator::LT: 5239 case BinaryOperator::GE: 5240 case BinaryOperator::GT: 5241 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5242 break; 5243 case BinaryOperator::EQ: 5244 case BinaryOperator::NE: 5245 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5246 break; 5247 case BinaryOperator::And: 5248 case BinaryOperator::Xor: 5249 case BinaryOperator::Or: 5250 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5251 break; 5252 case BinaryOperator::LAnd: 5253 case BinaryOperator::LOr: 5254 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5255 break; 5256 case BinaryOperator::MulAssign: 5257 case BinaryOperator::DivAssign: 5258 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5259 CompLHSTy = CompResultTy; 5260 if (!CompResultTy.isNull()) 5261 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5262 break; 5263 case BinaryOperator::RemAssign: 5264 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5265 CompLHSTy = CompResultTy; 5266 if (!CompResultTy.isNull()) 5267 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5268 break; 5269 case BinaryOperator::AddAssign: 5270 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5271 if (!CompResultTy.isNull()) 5272 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5273 break; 5274 case BinaryOperator::SubAssign: 5275 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5276 if (!CompResultTy.isNull()) 5277 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5278 break; 5279 case BinaryOperator::ShlAssign: 5280 case BinaryOperator::ShrAssign: 5281 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5282 CompLHSTy = CompResultTy; 5283 if (!CompResultTy.isNull()) 5284 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5285 break; 5286 case BinaryOperator::AndAssign: 5287 case BinaryOperator::XorAssign: 5288 case BinaryOperator::OrAssign: 5289 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5290 CompLHSTy = CompResultTy; 5291 if (!CompResultTy.isNull()) 5292 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5293 break; 5294 case BinaryOperator::Comma: 5295 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5296 break; 5297 } 5298 if (ResultTy.isNull()) 5299 return ExprError(); 5300 if (CompResultTy.isNull()) 5301 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5302 else 5303 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5304 CompLHSTy, CompResultTy, 5305 OpLoc)); 5306} 5307 5308// Binary Operators. 'Tok' is the token for the operator. 5309Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5310 tok::TokenKind Kind, 5311 ExprArg LHS, ExprArg RHS) { 5312 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5313 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5314 5315 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5316 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5317 5318 if (getLangOptions().CPlusPlus && 5319 (lhs->getType()->isOverloadableType() || 5320 rhs->getType()->isOverloadableType())) { 5321 // Find all of the overloaded operators visible from this 5322 // point. We perform both an operator-name lookup from the local 5323 // scope and an argument-dependent lookup based on the types of 5324 // the arguments. 5325 FunctionSet Functions; 5326 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5327 if (OverOp != OO_None) { 5328 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5329 Functions); 5330 Expr *Args[2] = { lhs, rhs }; 5331 DeclarationName OpName 5332 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5333 ArgumentDependentLookup(OpName, Args, 2, Functions); 5334 } 5335 5336 // Build the (potentially-overloaded, potentially-dependent) 5337 // binary operation. 5338 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5339 } 5340 5341 // Build a built-in binary operation. 5342 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5343} 5344 5345Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5346 unsigned OpcIn, 5347 ExprArg InputArg) { 5348 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5349 5350 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5351 Expr *Input = (Expr *)InputArg.get(); 5352 QualType resultType; 5353 switch (Opc) { 5354 case UnaryOperator::OffsetOf: 5355 assert(false && "Invalid unary operator"); 5356 break; 5357 5358 case UnaryOperator::PreInc: 5359 case UnaryOperator::PreDec: 5360 case UnaryOperator::PostInc: 5361 case UnaryOperator::PostDec: 5362 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5363 Opc == UnaryOperator::PreInc || 5364 Opc == UnaryOperator::PostInc); 5365 break; 5366 case UnaryOperator::AddrOf: 5367 resultType = CheckAddressOfOperand(Input, OpLoc); 5368 break; 5369 case UnaryOperator::Deref: 5370 DefaultFunctionArrayConversion(Input); 5371 resultType = CheckIndirectionOperand(Input, OpLoc); 5372 break; 5373 case UnaryOperator::Plus: 5374 case UnaryOperator::Minus: 5375 UsualUnaryConversions(Input); 5376 resultType = Input->getType(); 5377 if (resultType->isDependentType()) 5378 break; 5379 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5380 break; 5381 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5382 resultType->isEnumeralType()) 5383 break; 5384 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5385 Opc == UnaryOperator::Plus && 5386 resultType->isPointerType()) 5387 break; 5388 5389 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5390 << resultType << Input->getSourceRange()); 5391 case UnaryOperator::Not: // bitwise complement 5392 UsualUnaryConversions(Input); 5393 resultType = Input->getType(); 5394 if (resultType->isDependentType()) 5395 break; 5396 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5397 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5398 // C99 does not support '~' for complex conjugation. 5399 Diag(OpLoc, diag::ext_integer_complement_complex) 5400 << resultType << Input->getSourceRange(); 5401 else if (!resultType->isIntegerType()) 5402 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5403 << resultType << Input->getSourceRange()); 5404 break; 5405 case UnaryOperator::LNot: // logical negation 5406 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5407 DefaultFunctionArrayConversion(Input); 5408 resultType = Input->getType(); 5409 if (resultType->isDependentType()) 5410 break; 5411 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5412 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5413 << resultType << Input->getSourceRange()); 5414 // LNot always has type int. C99 6.5.3.3p5. 5415 // In C++, it's bool. C++ 5.3.1p8 5416 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5417 break; 5418 case UnaryOperator::Real: 5419 case UnaryOperator::Imag: 5420 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5421 break; 5422 case UnaryOperator::Extension: 5423 resultType = Input->getType(); 5424 break; 5425 } 5426 if (resultType.isNull()) 5427 return ExprError(); 5428 5429 InputArg.release(); 5430 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5431} 5432 5433// Unary Operators. 'Tok' is the token for the operator. 5434Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5435 tok::TokenKind Op, ExprArg input) { 5436 Expr *Input = (Expr*)input.get(); 5437 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5438 5439 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5440 // Find all of the overloaded operators visible from this 5441 // point. We perform both an operator-name lookup from the local 5442 // scope and an argument-dependent lookup based on the types of 5443 // the arguments. 5444 FunctionSet Functions; 5445 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5446 if (OverOp != OO_None) { 5447 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5448 Functions); 5449 DeclarationName OpName 5450 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5451 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5452 } 5453 5454 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5455 } 5456 5457 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5458} 5459 5460/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5461Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5462 SourceLocation LabLoc, 5463 IdentifierInfo *LabelII) { 5464 // Look up the record for this label identifier. 5465 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5466 5467 // If we haven't seen this label yet, create a forward reference. It 5468 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5469 if (LabelDecl == 0) 5470 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5471 5472 // Create the AST node. The address of a label always has type 'void*'. 5473 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5474 Context.getPointerType(Context.VoidTy))); 5475} 5476 5477Sema::OwningExprResult 5478Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5479 SourceLocation RPLoc) { // "({..})" 5480 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5481 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5482 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5483 5484 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5485 if (isFileScope) 5486 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5487 5488 // FIXME: there are a variety of strange constraints to enforce here, for 5489 // example, it is not possible to goto into a stmt expression apparently. 5490 // More semantic analysis is needed. 5491 5492 // If there are sub stmts in the compound stmt, take the type of the last one 5493 // as the type of the stmtexpr. 5494 QualType Ty = Context.VoidTy; 5495 5496 if (!Compound->body_empty()) { 5497 Stmt *LastStmt = Compound->body_back(); 5498 // If LastStmt is a label, skip down through into the body. 5499 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5500 LastStmt = Label->getSubStmt(); 5501 5502 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5503 Ty = LastExpr->getType(); 5504 } 5505 5506 // FIXME: Check that expression type is complete/non-abstract; statement 5507 // expressions are not lvalues. 5508 5509 substmt.release(); 5510 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5511} 5512 5513Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5514 SourceLocation BuiltinLoc, 5515 SourceLocation TypeLoc, 5516 TypeTy *argty, 5517 OffsetOfComponent *CompPtr, 5518 unsigned NumComponents, 5519 SourceLocation RPLoc) { 5520 // FIXME: This function leaks all expressions in the offset components on 5521 // error. 5522 // FIXME: Preserve type source info. 5523 QualType ArgTy = GetTypeFromParser(argty); 5524 assert(!ArgTy.isNull() && "Missing type argument!"); 5525 5526 bool Dependent = ArgTy->isDependentType(); 5527 5528 // We must have at least one component that refers to the type, and the first 5529 // one is known to be a field designator. Verify that the ArgTy represents 5530 // a struct/union/class. 5531 if (!Dependent && !ArgTy->isRecordType()) 5532 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5533 5534 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5535 // with an incomplete type would be illegal. 5536 5537 // Otherwise, create a null pointer as the base, and iteratively process 5538 // the offsetof designators. 5539 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5540 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5541 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5542 ArgTy, SourceLocation()); 5543 5544 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5545 // GCC extension, diagnose them. 5546 // FIXME: This diagnostic isn't actually visible because the location is in 5547 // a system header! 5548 if (NumComponents != 1) 5549 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5550 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5551 5552 if (!Dependent) { 5553 bool DidWarnAboutNonPOD = false; 5554 5555 // FIXME: Dependent case loses a lot of information here. And probably 5556 // leaks like a sieve. 5557 for (unsigned i = 0; i != NumComponents; ++i) { 5558 const OffsetOfComponent &OC = CompPtr[i]; 5559 if (OC.isBrackets) { 5560 // Offset of an array sub-field. TODO: Should we allow vector elements? 5561 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5562 if (!AT) { 5563 Res->Destroy(Context); 5564 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5565 << Res->getType()); 5566 } 5567 5568 // FIXME: C++: Verify that operator[] isn't overloaded. 5569 5570 // Promote the array so it looks more like a normal array subscript 5571 // expression. 5572 DefaultFunctionArrayConversion(Res); 5573 5574 // C99 6.5.2.1p1 5575 Expr *Idx = static_cast<Expr*>(OC.U.E); 5576 // FIXME: Leaks Res 5577 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5578 return ExprError(Diag(Idx->getLocStart(), 5579 diag::err_typecheck_subscript_not_integer) 5580 << Idx->getSourceRange()); 5581 5582 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5583 OC.LocEnd); 5584 continue; 5585 } 5586 5587 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5588 if (!RC) { 5589 Res->Destroy(Context); 5590 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5591 << Res->getType()); 5592 } 5593 5594 // Get the decl corresponding to this. 5595 RecordDecl *RD = RC->getDecl(); 5596 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5597 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5598 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5599 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5600 << Res->getType()); 5601 DidWarnAboutNonPOD = true; 5602 } 5603 } 5604 5605 FieldDecl *MemberDecl 5606 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5607 LookupMemberName) 5608 .getAsDecl()); 5609 // FIXME: Leaks Res 5610 if (!MemberDecl) 5611 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member_deprecated) 5612 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5613 5614 // FIXME: C++: Verify that MemberDecl isn't a static field. 5615 // FIXME: Verify that MemberDecl isn't a bitfield. 5616 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5617 Res = BuildAnonymousStructUnionMemberReference( 5618 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5619 } else { 5620 // MemberDecl->getType() doesn't get the right qualifiers, but it 5621 // doesn't matter here. 5622 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5623 MemberDecl->getType().getNonReferenceType()); 5624 } 5625 } 5626 } 5627 5628 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5629 Context.getSizeType(), BuiltinLoc)); 5630} 5631 5632 5633Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5634 TypeTy *arg1,TypeTy *arg2, 5635 SourceLocation RPLoc) { 5636 // FIXME: Preserve type source info. 5637 QualType argT1 = GetTypeFromParser(arg1); 5638 QualType argT2 = GetTypeFromParser(arg2); 5639 5640 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5641 5642 if (getLangOptions().CPlusPlus) { 5643 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5644 << SourceRange(BuiltinLoc, RPLoc); 5645 return ExprError(); 5646 } 5647 5648 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5649 argT1, argT2, RPLoc)); 5650} 5651 5652Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5653 ExprArg cond, 5654 ExprArg expr1, ExprArg expr2, 5655 SourceLocation RPLoc) { 5656 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5657 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5658 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5659 5660 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5661 5662 QualType resType; 5663 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5664 resType = Context.DependentTy; 5665 } else { 5666 // The conditional expression is required to be a constant expression. 5667 llvm::APSInt condEval(32); 5668 SourceLocation ExpLoc; 5669 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5670 return ExprError(Diag(ExpLoc, 5671 diag::err_typecheck_choose_expr_requires_constant) 5672 << CondExpr->getSourceRange()); 5673 5674 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5675 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5676 } 5677 5678 cond.release(); expr1.release(); expr2.release(); 5679 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5680 resType, RPLoc)); 5681} 5682 5683//===----------------------------------------------------------------------===// 5684// Clang Extensions. 5685//===----------------------------------------------------------------------===// 5686 5687/// ActOnBlockStart - This callback is invoked when a block literal is started. 5688void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5689 // Analyze block parameters. 5690 BlockSemaInfo *BSI = new BlockSemaInfo(); 5691 5692 // Add BSI to CurBlock. 5693 BSI->PrevBlockInfo = CurBlock; 5694 CurBlock = BSI; 5695 5696 BSI->ReturnType = QualType(); 5697 BSI->TheScope = BlockScope; 5698 BSI->hasBlockDeclRefExprs = false; 5699 BSI->hasPrototype = false; 5700 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5701 CurFunctionNeedsScopeChecking = false; 5702 5703 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5704 PushDeclContext(BlockScope, BSI->TheDecl); 5705} 5706 5707void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5708 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5709 5710 if (ParamInfo.getNumTypeObjects() == 0 5711 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5712 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5713 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5714 5715 if (T->isArrayType()) { 5716 Diag(ParamInfo.getSourceRange().getBegin(), 5717 diag::err_block_returns_array); 5718 return; 5719 } 5720 5721 // The parameter list is optional, if there was none, assume (). 5722 if (!T->isFunctionType()) 5723 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5724 5725 CurBlock->hasPrototype = true; 5726 CurBlock->isVariadic = false; 5727 // Check for a valid sentinel attribute on this block. 5728 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5729 Diag(ParamInfo.getAttributes()->getLoc(), 5730 diag::warn_attribute_sentinel_not_variadic) << 1; 5731 // FIXME: remove the attribute. 5732 } 5733 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5734 5735 // Do not allow returning a objc interface by-value. 5736 if (RetTy->isObjCInterfaceType()) { 5737 Diag(ParamInfo.getSourceRange().getBegin(), 5738 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5739 return; 5740 } 5741 return; 5742 } 5743 5744 // Analyze arguments to block. 5745 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5746 "Not a function declarator!"); 5747 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5748 5749 CurBlock->hasPrototype = FTI.hasPrototype; 5750 CurBlock->isVariadic = true; 5751 5752 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5753 // no arguments, not a function that takes a single void argument. 5754 if (FTI.hasPrototype && 5755 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5756 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5757 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5758 // empty arg list, don't push any params. 5759 CurBlock->isVariadic = false; 5760 } else if (FTI.hasPrototype) { 5761 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5762 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5763 CurBlock->isVariadic = FTI.isVariadic; 5764 } 5765 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5766 CurBlock->Params.size()); 5767 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5768 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5769 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5770 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5771 // If this has an identifier, add it to the scope stack. 5772 if ((*AI)->getIdentifier()) 5773 PushOnScopeChains(*AI, CurBlock->TheScope); 5774 5775 // Check for a valid sentinel attribute on this block. 5776 if (!CurBlock->isVariadic && 5777 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5778 Diag(ParamInfo.getAttributes()->getLoc(), 5779 diag::warn_attribute_sentinel_not_variadic) << 1; 5780 // FIXME: remove the attribute. 5781 } 5782 5783 // Analyze the return type. 5784 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5785 QualType RetTy = T->getAsFunctionType()->getResultType(); 5786 5787 // Do not allow returning a objc interface by-value. 5788 if (RetTy->isObjCInterfaceType()) { 5789 Diag(ParamInfo.getSourceRange().getBegin(), 5790 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5791 } else if (!RetTy->isDependentType()) 5792 CurBlock->ReturnType = RetTy; 5793} 5794 5795/// ActOnBlockError - If there is an error parsing a block, this callback 5796/// is invoked to pop the information about the block from the action impl. 5797void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5798 // Ensure that CurBlock is deleted. 5799 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5800 5801 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5802 5803 // Pop off CurBlock, handle nested blocks. 5804 PopDeclContext(); 5805 CurBlock = CurBlock->PrevBlockInfo; 5806 // FIXME: Delete the ParmVarDecl objects as well??? 5807} 5808 5809/// ActOnBlockStmtExpr - This is called when the body of a block statement 5810/// literal was successfully completed. ^(int x){...} 5811Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5812 StmtArg body, Scope *CurScope) { 5813 // If blocks are disabled, emit an error. 5814 if (!LangOpts.Blocks) 5815 Diag(CaretLoc, diag::err_blocks_disable); 5816 5817 // Ensure that CurBlock is deleted. 5818 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5819 5820 PopDeclContext(); 5821 5822 // Pop off CurBlock, handle nested blocks. 5823 CurBlock = CurBlock->PrevBlockInfo; 5824 5825 QualType RetTy = Context.VoidTy; 5826 if (!BSI->ReturnType.isNull()) 5827 RetTy = BSI->ReturnType; 5828 5829 llvm::SmallVector<QualType, 8> ArgTypes; 5830 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5831 ArgTypes.push_back(BSI->Params[i]->getType()); 5832 5833 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5834 QualType BlockTy; 5835 if (!BSI->hasPrototype) 5836 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5837 NoReturn); 5838 else 5839 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5840 BSI->isVariadic, 0, false, false, 0, 0, 5841 NoReturn); 5842 5843 // FIXME: Check that return/parameter types are complete/non-abstract 5844 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5845 BlockTy = Context.getBlockPointerType(BlockTy); 5846 5847 // If needed, diagnose invalid gotos and switches in the block. 5848 if (CurFunctionNeedsScopeChecking) 5849 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5850 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5851 5852 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5853 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5854 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5855 BSI->hasBlockDeclRefExprs)); 5856} 5857 5858Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5859 ExprArg expr, TypeTy *type, 5860 SourceLocation RPLoc) { 5861 QualType T = GetTypeFromParser(type); 5862 Expr *E = static_cast<Expr*>(expr.get()); 5863 Expr *OrigExpr = E; 5864 5865 InitBuiltinVaListType(); 5866 5867 // Get the va_list type 5868 QualType VaListType = Context.getBuiltinVaListType(); 5869 if (VaListType->isArrayType()) { 5870 // Deal with implicit array decay; for example, on x86-64, 5871 // va_list is an array, but it's supposed to decay to 5872 // a pointer for va_arg. 5873 VaListType = Context.getArrayDecayedType(VaListType); 5874 // Make sure the input expression also decays appropriately. 5875 UsualUnaryConversions(E); 5876 } else { 5877 // Otherwise, the va_list argument must be an l-value because 5878 // it is modified by va_arg. 5879 if (!E->isTypeDependent() && 5880 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5881 return ExprError(); 5882 } 5883 5884 if (!E->isTypeDependent() && 5885 !Context.hasSameType(VaListType, E->getType())) { 5886 return ExprError(Diag(E->getLocStart(), 5887 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5888 << OrigExpr->getType() << E->getSourceRange()); 5889 } 5890 5891 // FIXME: Check that type is complete/non-abstract 5892 // FIXME: Warn if a non-POD type is passed in. 5893 5894 expr.release(); 5895 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5896 RPLoc)); 5897} 5898 5899Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5900 // The type of __null will be int or long, depending on the size of 5901 // pointers on the target. 5902 QualType Ty; 5903 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5904 Ty = Context.IntTy; 5905 else 5906 Ty = Context.LongTy; 5907 5908 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5909} 5910 5911bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5912 SourceLocation Loc, 5913 QualType DstType, QualType SrcType, 5914 Expr *SrcExpr, const char *Flavor) { 5915 // Decode the result (notice that AST's are still created for extensions). 5916 bool isInvalid = false; 5917 unsigned DiagKind; 5918 switch (ConvTy) { 5919 default: assert(0 && "Unknown conversion type"); 5920 case Compatible: return false; 5921 case PointerToInt: 5922 DiagKind = diag::ext_typecheck_convert_pointer_int; 5923 break; 5924 case IntToPointer: 5925 DiagKind = diag::ext_typecheck_convert_int_pointer; 5926 break; 5927 case IncompatiblePointer: 5928 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5929 break; 5930 case IncompatiblePointerSign: 5931 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5932 break; 5933 case FunctionVoidPointer: 5934 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5935 break; 5936 case CompatiblePointerDiscardsQualifiers: 5937 // If the qualifiers lost were because we were applying the 5938 // (deprecated) C++ conversion from a string literal to a char* 5939 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5940 // Ideally, this check would be performed in 5941 // CheckPointerTypesForAssignment. However, that would require a 5942 // bit of refactoring (so that the second argument is an 5943 // expression, rather than a type), which should be done as part 5944 // of a larger effort to fix CheckPointerTypesForAssignment for 5945 // C++ semantics. 5946 if (getLangOptions().CPlusPlus && 5947 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5948 return false; 5949 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5950 break; 5951 case IntToBlockPointer: 5952 DiagKind = diag::err_int_to_block_pointer; 5953 break; 5954 case IncompatibleBlockPointer: 5955 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5956 break; 5957 case IncompatibleObjCQualifiedId: 5958 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5959 // it can give a more specific diagnostic. 5960 DiagKind = diag::warn_incompatible_qualified_id; 5961 break; 5962 case IncompatibleVectors: 5963 DiagKind = diag::warn_incompatible_vectors; 5964 break; 5965 case Incompatible: 5966 DiagKind = diag::err_typecheck_convert_incompatible; 5967 isInvalid = true; 5968 break; 5969 } 5970 5971 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5972 << SrcExpr->getSourceRange(); 5973 return isInvalid; 5974} 5975 5976bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5977 llvm::APSInt ICEResult; 5978 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5979 if (Result) 5980 *Result = ICEResult; 5981 return false; 5982 } 5983 5984 Expr::EvalResult EvalResult; 5985 5986 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5987 EvalResult.HasSideEffects) { 5988 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5989 5990 if (EvalResult.Diag) { 5991 // We only show the note if it's not the usual "invalid subexpression" 5992 // or if it's actually in a subexpression. 5993 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5994 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5995 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5996 } 5997 5998 return true; 5999 } 6000 6001 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 6002 E->getSourceRange(); 6003 6004 if (EvalResult.Diag && 6005 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 6006 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6007 6008 if (Result) 6009 *Result = EvalResult.Val.getInt(); 6010 return false; 6011} 6012 6013Sema::ExpressionEvaluationContext 6014Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 6015 // Introduce a new set of potentially referenced declarations to the stack. 6016 if (NewContext == PotentiallyPotentiallyEvaluated) 6017 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 6018 6019 std::swap(ExprEvalContext, NewContext); 6020 return NewContext; 6021} 6022 6023void 6024Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 6025 ExpressionEvaluationContext NewContext) { 6026 ExprEvalContext = NewContext; 6027 6028 if (OldContext == PotentiallyPotentiallyEvaluated) { 6029 // Mark any remaining declarations in the current position of the stack 6030 // as "referenced". If they were not meant to be referenced, semantic 6031 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 6032 PotentiallyReferencedDecls RemainingDecls; 6033 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 6034 PotentiallyReferencedDeclStack.pop_back(); 6035 6036 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 6037 IEnd = RemainingDecls.end(); 6038 I != IEnd; ++I) 6039 MarkDeclarationReferenced(I->first, I->second); 6040 } 6041} 6042 6043/// \brief Note that the given declaration was referenced in the source code. 6044/// 6045/// This routine should be invoke whenever a given declaration is referenced 6046/// in the source code, and where that reference occurred. If this declaration 6047/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 6048/// C99 6.9p3), then the declaration will be marked as used. 6049/// 6050/// \param Loc the location where the declaration was referenced. 6051/// 6052/// \param D the declaration that has been referenced by the source code. 6053void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 6054 assert(D && "No declaration?"); 6055 6056 if (D->isUsed()) 6057 return; 6058 6059 // Mark a parameter declaration "used", regardless of whether we're in a 6060 // template or not. 6061 if (isa<ParmVarDecl>(D)) 6062 D->setUsed(true); 6063 6064 // Do not mark anything as "used" within a dependent context; wait for 6065 // an instantiation. 6066 if (CurContext->isDependentContext()) 6067 return; 6068 6069 switch (ExprEvalContext) { 6070 case Unevaluated: 6071 // We are in an expression that is not potentially evaluated; do nothing. 6072 return; 6073 6074 case PotentiallyEvaluated: 6075 // We are in a potentially-evaluated expression, so this declaration is 6076 // "used"; handle this below. 6077 break; 6078 6079 case PotentiallyPotentiallyEvaluated: 6080 // We are in an expression that may be potentially evaluated; queue this 6081 // declaration reference until we know whether the expression is 6082 // potentially evaluated. 6083 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6084 return; 6085 } 6086 6087 // Note that this declaration has been used. 6088 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6089 unsigned TypeQuals; 6090 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6091 if (!Constructor->isUsed()) 6092 DefineImplicitDefaultConstructor(Loc, Constructor); 6093 } else if (Constructor->isImplicit() && 6094 Constructor->isCopyConstructor(Context, TypeQuals)) { 6095 if (!Constructor->isUsed()) 6096 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6097 } 6098 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6099 if (Destructor->isImplicit() && !Destructor->isUsed()) 6100 DefineImplicitDestructor(Loc, Destructor); 6101 6102 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6103 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6104 MethodDecl->getOverloadedOperator() == OO_Equal) { 6105 if (!MethodDecl->isUsed()) 6106 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6107 } 6108 } 6109 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6110 // Implicit instantiation of function templates and member functions of 6111 // class templates. 6112 if (!Function->getBody()) { 6113 // FIXME: distinguish between implicit instantiations of function 6114 // templates and explicit specializations (the latter don't get 6115 // instantiated, naturally). 6116 if (Function->getInstantiatedFromMemberFunction() || 6117 Function->getPrimaryTemplate()) 6118 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6119 } 6120 6121 6122 // FIXME: keep track of references to static functions 6123 Function->setUsed(true); 6124 return; 6125 } 6126 6127 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6128 // Implicit instantiation of static data members of class templates. 6129 // FIXME: distinguish between implicit instantiations (which we need to 6130 // actually instantiate) and explicit specializations. 6131 // FIXME: extern templates 6132 if (Var->isStaticDataMember() && 6133 Var->getInstantiatedFromStaticDataMember()) 6134 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6135 6136 // FIXME: keep track of references to static data? 6137 6138 D->setUsed(true); 6139 return; 6140 } 6141} 6142 6143