SemaExpr.cpp revision 7d2326b31c20bea66ed0bf3426f9d62d360134de
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 if (DiagnoseUseOfDecl(D, Loc)) 1006 return ExprError(); 1007 return Owned(BuildMemberExpr(Context, This, true, SS, D, 1008 Loc, MemberType)); 1009 } 1010 } 1011 } 1012 } 1013 1014 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1015 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1016 if (MD->isStatic()) 1017 // "invalid use of member 'x' in static member function" 1018 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1019 << FD->getDeclName()); 1020 } 1021 1022 // Any other ways we could have found the field in a well-formed 1023 // program would have been turned into implicit member expressions 1024 // above. 1025 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1026 << FD->getDeclName()); 1027 } 1028 1029 if (isa<TypedefDecl>(D)) 1030 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1031 if (isa<ObjCInterfaceDecl>(D)) 1032 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1033 if (isa<NamespaceDecl>(D)) 1034 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1035 1036 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1037 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1038 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1039 false, false, SS); 1040 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1041 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1042 false, false, SS); 1043 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 1044 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 1045 /*TypeDependent=*/true, 1046 /*ValueDependent=*/true, SS); 1047 1048 ValueDecl *VD = cast<ValueDecl>(D); 1049 1050 // Check whether this declaration can be used. Note that we suppress 1051 // this check when we're going to perform argument-dependent lookup 1052 // on this function name, because this might not be the function 1053 // that overload resolution actually selects. 1054 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1055 HasTrailingLParen; 1056 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1057 return ExprError(); 1058 1059 // Only create DeclRefExpr's for valid Decl's. 1060 if (VD->isInvalidDecl()) 1061 return ExprError(); 1062 1063 // If the identifier reference is inside a block, and it refers to a value 1064 // that is outside the block, create a BlockDeclRefExpr instead of a 1065 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1066 // the block is formed. 1067 // 1068 // We do not do this for things like enum constants, global variables, etc, 1069 // as they do not get snapshotted. 1070 // 1071 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1072 MarkDeclarationReferenced(Loc, VD); 1073 QualType ExprTy = VD->getType().getNonReferenceType(); 1074 // The BlocksAttr indicates the variable is bound by-reference. 1075 if (VD->getAttr<BlocksAttr>()) 1076 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1077 // This is to record that a 'const' was actually synthesize and added. 1078 bool constAdded = !ExprTy.isConstQualified(); 1079 // Variable will be bound by-copy, make it const within the closure. 1080 1081 ExprTy.addConst(); 1082 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1083 constAdded)); 1084 } 1085 // If this reference is not in a block or if the referenced variable is 1086 // within the block, create a normal DeclRefExpr. 1087 1088 bool TypeDependent = false; 1089 bool ValueDependent = false; 1090 if (getLangOptions().CPlusPlus) { 1091 // C++ [temp.dep.expr]p3: 1092 // An id-expression is type-dependent if it contains: 1093 // - an identifier that was declared with a dependent type, 1094 if (VD->getType()->isDependentType()) 1095 TypeDependent = true; 1096 // - FIXME: a template-id that is dependent, 1097 // - a conversion-function-id that specifies a dependent type, 1098 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1099 Name.getCXXNameType()->isDependentType()) 1100 TypeDependent = true; 1101 // - a nested-name-specifier that contains a class-name that 1102 // names a dependent type. 1103 else if (SS && !SS->isEmpty()) { 1104 for (DeclContext *DC = computeDeclContext(*SS); 1105 DC; DC = DC->getParent()) { 1106 // FIXME: could stop early at namespace scope. 1107 if (DC->isRecord()) { 1108 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1109 if (Context.getTypeDeclType(Record)->isDependentType()) { 1110 TypeDependent = true; 1111 break; 1112 } 1113 } 1114 } 1115 } 1116 1117 // C++ [temp.dep.constexpr]p2: 1118 // 1119 // An identifier is value-dependent if it is: 1120 // - a name declared with a dependent type, 1121 if (TypeDependent) 1122 ValueDependent = true; 1123 // - the name of a non-type template parameter, 1124 else if (isa<NonTypeTemplateParmDecl>(VD)) 1125 ValueDependent = true; 1126 // - a constant with integral or enumeration type and is 1127 // initialized with an expression that is value-dependent 1128 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1129 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1130 Dcl->getInit()) { 1131 ValueDependent = Dcl->getInit()->isValueDependent(); 1132 } 1133 } 1134 } 1135 1136 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1137 TypeDependent, ValueDependent, SS); 1138} 1139 1140Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1141 tok::TokenKind Kind) { 1142 PredefinedExpr::IdentType IT; 1143 1144 switch (Kind) { 1145 default: assert(0 && "Unknown simple primary expr!"); 1146 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1147 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1148 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1149 } 1150 1151 // Pre-defined identifiers are of type char[x], where x is the length of the 1152 // string. 1153 1154 Decl *currentDecl = getCurFunctionOrMethodDecl(); 1155 if (!currentDecl) { 1156 Diag(Loc, diag::ext_predef_outside_function); 1157 currentDecl = Context.getTranslationUnitDecl(); 1158 } 1159 1160 QualType ResTy; 1161 if (cast<DeclContext>(currentDecl)->isDependentContext()) { 1162 ResTy = Context.DependentTy; 1163 } else { 1164 unsigned Length = 1165 PredefinedExpr::ComputeName(Context, IT, currentDecl).length(); 1166 1167 llvm::APInt LengthI(32, Length + 1); 1168 ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1169 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1170 } 1171 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1172} 1173 1174Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1175 llvm::SmallString<16> CharBuffer; 1176 CharBuffer.resize(Tok.getLength()); 1177 const char *ThisTokBegin = &CharBuffer[0]; 1178 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1179 1180 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1181 Tok.getLocation(), PP); 1182 if (Literal.hadError()) 1183 return ExprError(); 1184 1185 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1186 1187 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1188 Literal.isWide(), 1189 type, Tok.getLocation())); 1190} 1191 1192Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1193 // Fast path for a single digit (which is quite common). A single digit 1194 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1195 if (Tok.getLength() == 1) { 1196 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1197 unsigned IntSize = Context.Target.getIntWidth(); 1198 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1199 Context.IntTy, Tok.getLocation())); 1200 } 1201 1202 llvm::SmallString<512> IntegerBuffer; 1203 // Add padding so that NumericLiteralParser can overread by one character. 1204 IntegerBuffer.resize(Tok.getLength()+1); 1205 const char *ThisTokBegin = &IntegerBuffer[0]; 1206 1207 // Get the spelling of the token, which eliminates trigraphs, etc. 1208 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1209 1210 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1211 Tok.getLocation(), PP); 1212 if (Literal.hadError) 1213 return ExprError(); 1214 1215 Expr *Res; 1216 1217 if (Literal.isFloatingLiteral()) { 1218 QualType Ty; 1219 if (Literal.isFloat) 1220 Ty = Context.FloatTy; 1221 else if (!Literal.isLong) 1222 Ty = Context.DoubleTy; 1223 else 1224 Ty = Context.LongDoubleTy; 1225 1226 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1227 1228 // isExact will be set by GetFloatValue(). 1229 bool isExact = false; 1230 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1231 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1232 1233 } else if (!Literal.isIntegerLiteral()) { 1234 return ExprError(); 1235 } else { 1236 QualType Ty; 1237 1238 // long long is a C99 feature. 1239 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1240 Literal.isLongLong) 1241 Diag(Tok.getLocation(), diag::ext_longlong); 1242 1243 // Get the value in the widest-possible width. 1244 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1245 1246 if (Literal.GetIntegerValue(ResultVal)) { 1247 // If this value didn't fit into uintmax_t, warn and force to ull. 1248 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1249 Ty = Context.UnsignedLongLongTy; 1250 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1251 "long long is not intmax_t?"); 1252 } else { 1253 // If this value fits into a ULL, try to figure out what else it fits into 1254 // according to the rules of C99 6.4.4.1p5. 1255 1256 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1257 // be an unsigned int. 1258 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1259 1260 // Check from smallest to largest, picking the smallest type we can. 1261 unsigned Width = 0; 1262 if (!Literal.isLong && !Literal.isLongLong) { 1263 // Are int/unsigned possibilities? 1264 unsigned IntSize = Context.Target.getIntWidth(); 1265 1266 // Does it fit in a unsigned int? 1267 if (ResultVal.isIntN(IntSize)) { 1268 // Does it fit in a signed int? 1269 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1270 Ty = Context.IntTy; 1271 else if (AllowUnsigned) 1272 Ty = Context.UnsignedIntTy; 1273 Width = IntSize; 1274 } 1275 } 1276 1277 // Are long/unsigned long possibilities? 1278 if (Ty.isNull() && !Literal.isLongLong) { 1279 unsigned LongSize = Context.Target.getLongWidth(); 1280 1281 // Does it fit in a unsigned long? 1282 if (ResultVal.isIntN(LongSize)) { 1283 // Does it fit in a signed long? 1284 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1285 Ty = Context.LongTy; 1286 else if (AllowUnsigned) 1287 Ty = Context.UnsignedLongTy; 1288 Width = LongSize; 1289 } 1290 } 1291 1292 // Finally, check long long if needed. 1293 if (Ty.isNull()) { 1294 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1295 1296 // Does it fit in a unsigned long long? 1297 if (ResultVal.isIntN(LongLongSize)) { 1298 // Does it fit in a signed long long? 1299 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1300 Ty = Context.LongLongTy; 1301 else if (AllowUnsigned) 1302 Ty = Context.UnsignedLongLongTy; 1303 Width = LongLongSize; 1304 } 1305 } 1306 1307 // If we still couldn't decide a type, we probably have something that 1308 // does not fit in a signed long long, but has no U suffix. 1309 if (Ty.isNull()) { 1310 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1311 Ty = Context.UnsignedLongLongTy; 1312 Width = Context.Target.getLongLongWidth(); 1313 } 1314 1315 if (ResultVal.getBitWidth() != Width) 1316 ResultVal.trunc(Width); 1317 } 1318 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1319 } 1320 1321 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1322 if (Literal.isImaginary) 1323 Res = new (Context) ImaginaryLiteral(Res, 1324 Context.getComplexType(Res->getType())); 1325 1326 return Owned(Res); 1327} 1328 1329Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1330 SourceLocation R, ExprArg Val) { 1331 Expr *E = Val.takeAs<Expr>(); 1332 assert((E != 0) && "ActOnParenExpr() missing expr"); 1333 return Owned(new (Context) ParenExpr(L, R, E)); 1334} 1335 1336/// The UsualUnaryConversions() function is *not* called by this routine. 1337/// See C99 6.3.2.1p[2-4] for more details. 1338bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1339 SourceLocation OpLoc, 1340 const SourceRange &ExprRange, 1341 bool isSizeof) { 1342 if (exprType->isDependentType()) 1343 return false; 1344 1345 // C99 6.5.3.4p1: 1346 if (isa<FunctionType>(exprType)) { 1347 // alignof(function) is allowed as an extension. 1348 if (isSizeof) 1349 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1350 return false; 1351 } 1352 1353 // Allow sizeof(void)/alignof(void) as an extension. 1354 if (exprType->isVoidType()) { 1355 Diag(OpLoc, diag::ext_sizeof_void_type) 1356 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1357 return false; 1358 } 1359 1360 if (RequireCompleteType(OpLoc, exprType, 1361 isSizeof ? diag::err_sizeof_incomplete_type : 1362 PDiag(diag::err_alignof_incomplete_type) 1363 << ExprRange)) 1364 return true; 1365 1366 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1367 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1368 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1369 << exprType << isSizeof << ExprRange; 1370 return true; 1371 } 1372 1373 return false; 1374} 1375 1376bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1377 const SourceRange &ExprRange) { 1378 E = E->IgnoreParens(); 1379 1380 // alignof decl is always ok. 1381 if (isa<DeclRefExpr>(E)) 1382 return false; 1383 1384 // Cannot know anything else if the expression is dependent. 1385 if (E->isTypeDependent()) 1386 return false; 1387 1388 if (E->getBitField()) { 1389 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1390 return true; 1391 } 1392 1393 // Alignment of a field access is always okay, so long as it isn't a 1394 // bit-field. 1395 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1396 if (isa<FieldDecl>(ME->getMemberDecl())) 1397 return false; 1398 1399 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1400} 1401 1402/// \brief Build a sizeof or alignof expression given a type operand. 1403Action::OwningExprResult 1404Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1405 bool isSizeOf, SourceRange R) { 1406 if (T.isNull()) 1407 return ExprError(); 1408 1409 if (!T->isDependentType() && 1410 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1411 return ExprError(); 1412 1413 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1414 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1415 Context.getSizeType(), OpLoc, 1416 R.getEnd())); 1417} 1418 1419/// \brief Build a sizeof or alignof expression given an expression 1420/// operand. 1421Action::OwningExprResult 1422Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1423 bool isSizeOf, SourceRange R) { 1424 // Verify that the operand is valid. 1425 bool isInvalid = false; 1426 if (E->isTypeDependent()) { 1427 // Delay type-checking for type-dependent expressions. 1428 } else if (!isSizeOf) { 1429 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1430 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1431 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1432 isInvalid = true; 1433 } else { 1434 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1435 } 1436 1437 if (isInvalid) 1438 return ExprError(); 1439 1440 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1441 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1442 Context.getSizeType(), OpLoc, 1443 R.getEnd())); 1444} 1445 1446/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1447/// the same for @c alignof and @c __alignof 1448/// Note that the ArgRange is invalid if isType is false. 1449Action::OwningExprResult 1450Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1451 void *TyOrEx, const SourceRange &ArgRange) { 1452 // If error parsing type, ignore. 1453 if (TyOrEx == 0) return ExprError(); 1454 1455 if (isType) { 1456 // FIXME: Preserve type source info. 1457 QualType ArgTy = GetTypeFromParser(TyOrEx); 1458 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1459 } 1460 1461 // Get the end location. 1462 Expr *ArgEx = (Expr *)TyOrEx; 1463 Action::OwningExprResult Result 1464 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1465 1466 if (Result.isInvalid()) 1467 DeleteExpr(ArgEx); 1468 1469 return move(Result); 1470} 1471 1472QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1473 if (V->isTypeDependent()) 1474 return Context.DependentTy; 1475 1476 // These operators return the element type of a complex type. 1477 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1478 return CT->getElementType(); 1479 1480 // Otherwise they pass through real integer and floating point types here. 1481 if (V->getType()->isArithmeticType()) 1482 return V->getType(); 1483 1484 // Reject anything else. 1485 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1486 << (isReal ? "__real" : "__imag"); 1487 return QualType(); 1488} 1489 1490 1491 1492Action::OwningExprResult 1493Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1494 tok::TokenKind Kind, ExprArg Input) { 1495 // Since this might be a postfix expression, get rid of ParenListExprs. 1496 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1497 Expr *Arg = (Expr *)Input.get(); 1498 1499 UnaryOperator::Opcode Opc; 1500 switch (Kind) { 1501 default: assert(0 && "Unknown unary op!"); 1502 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1503 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1504 } 1505 1506 if (getLangOptions().CPlusPlus && 1507 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1508 // Which overloaded operator? 1509 OverloadedOperatorKind OverOp = 1510 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1511 1512 // C++ [over.inc]p1: 1513 // 1514 // [...] If the function is a member function with one 1515 // parameter (which shall be of type int) or a non-member 1516 // function with two parameters (the second of which shall be 1517 // of type int), it defines the postfix increment operator ++ 1518 // for objects of that type. When the postfix increment is 1519 // called as a result of using the ++ operator, the int 1520 // argument will have value zero. 1521 Expr *Args[2] = { 1522 Arg, 1523 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1524 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1525 }; 1526 1527 // Build the candidate set for overloading 1528 OverloadCandidateSet CandidateSet; 1529 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1530 1531 // Perform overload resolution. 1532 OverloadCandidateSet::iterator Best; 1533 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1534 case OR_Success: { 1535 // We found a built-in operator or an overloaded operator. 1536 FunctionDecl *FnDecl = Best->Function; 1537 1538 if (FnDecl) { 1539 // We matched an overloaded operator. Build a call to that 1540 // operator. 1541 1542 // Convert the arguments. 1543 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1544 if (PerformObjectArgumentInitialization(Arg, Method)) 1545 return ExprError(); 1546 } else { 1547 // Convert the arguments. 1548 if (PerformCopyInitialization(Arg, 1549 FnDecl->getParamDecl(0)->getType(), 1550 "passing")) 1551 return ExprError(); 1552 } 1553 1554 // Determine the result type 1555 QualType ResultTy 1556 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1557 ResultTy = ResultTy.getNonReferenceType(); 1558 1559 // Build the actual expression node. 1560 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1561 SourceLocation()); 1562 UsualUnaryConversions(FnExpr); 1563 1564 Input.release(); 1565 Args[0] = Arg; 1566 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1567 Args, 2, ResultTy, 1568 OpLoc)); 1569 } else { 1570 // We matched a built-in operator. Convert the arguments, then 1571 // break out so that we will build the appropriate built-in 1572 // operator node. 1573 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1574 "passing")) 1575 return ExprError(); 1576 1577 break; 1578 } 1579 } 1580 1581 case OR_No_Viable_Function: 1582 // No viable function; fall through to handling this as a 1583 // built-in operator, which will produce an error message for us. 1584 break; 1585 1586 case OR_Ambiguous: 1587 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1588 << UnaryOperator::getOpcodeStr(Opc) 1589 << Arg->getSourceRange(); 1590 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1591 return ExprError(); 1592 1593 case OR_Deleted: 1594 Diag(OpLoc, diag::err_ovl_deleted_oper) 1595 << Best->Function->isDeleted() 1596 << UnaryOperator::getOpcodeStr(Opc) 1597 << Arg->getSourceRange(); 1598 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1599 return ExprError(); 1600 } 1601 1602 // Either we found no viable overloaded operator or we matched a 1603 // built-in operator. In either case, fall through to trying to 1604 // build a built-in operation. 1605 } 1606 1607 Input.release(); 1608 Input = Arg; 1609 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1610} 1611 1612Action::OwningExprResult 1613Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1614 ExprArg Idx, SourceLocation RLoc) { 1615 // Since this might be a postfix expression, get rid of ParenListExprs. 1616 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1617 1618 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1619 *RHSExp = static_cast<Expr*>(Idx.get()); 1620 1621 if (getLangOptions().CPlusPlus && 1622 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1623 Base.release(); 1624 Idx.release(); 1625 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1626 Context.DependentTy, RLoc)); 1627 } 1628 1629 if (getLangOptions().CPlusPlus && 1630 (LHSExp->getType()->isRecordType() || 1631 LHSExp->getType()->isEnumeralType() || 1632 RHSExp->getType()->isRecordType() || 1633 RHSExp->getType()->isEnumeralType())) { 1634 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1635 // to the candidate set. 1636 OverloadCandidateSet CandidateSet; 1637 Expr *Args[2] = { LHSExp, RHSExp }; 1638 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1639 SourceRange(LLoc, RLoc)); 1640 1641 // Perform overload resolution. 1642 OverloadCandidateSet::iterator Best; 1643 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1644 case OR_Success: { 1645 // We found a built-in operator or an overloaded operator. 1646 FunctionDecl *FnDecl = Best->Function; 1647 1648 if (FnDecl) { 1649 // We matched an overloaded operator. Build a call to that 1650 // operator. 1651 1652 // Convert the arguments. 1653 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1654 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1655 PerformCopyInitialization(RHSExp, 1656 FnDecl->getParamDecl(0)->getType(), 1657 "passing")) 1658 return ExprError(); 1659 } else { 1660 // Convert the arguments. 1661 if (PerformCopyInitialization(LHSExp, 1662 FnDecl->getParamDecl(0)->getType(), 1663 "passing") || 1664 PerformCopyInitialization(RHSExp, 1665 FnDecl->getParamDecl(1)->getType(), 1666 "passing")) 1667 return ExprError(); 1668 } 1669 1670 // Determine the result type 1671 QualType ResultTy 1672 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1673 ResultTy = ResultTy.getNonReferenceType(); 1674 1675 // Build the actual expression node. 1676 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1677 SourceLocation()); 1678 UsualUnaryConversions(FnExpr); 1679 1680 Base.release(); 1681 Idx.release(); 1682 Args[0] = LHSExp; 1683 Args[1] = RHSExp; 1684 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1685 FnExpr, Args, 2, 1686 ResultTy, LLoc)); 1687 } else { 1688 // We matched a built-in operator. Convert the arguments, then 1689 // break out so that we will build the appropriate built-in 1690 // operator node. 1691 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1692 "passing") || 1693 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1694 "passing")) 1695 return ExprError(); 1696 1697 break; 1698 } 1699 } 1700 1701 case OR_No_Viable_Function: 1702 // No viable function; fall through to handling this as a 1703 // built-in operator, which will produce an error message for us. 1704 break; 1705 1706 case OR_Ambiguous: 1707 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1708 << "[]" 1709 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1710 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1711 return ExprError(); 1712 1713 case OR_Deleted: 1714 Diag(LLoc, diag::err_ovl_deleted_oper) 1715 << Best->Function->isDeleted() 1716 << "[]" 1717 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1718 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1719 return ExprError(); 1720 } 1721 1722 // Either we found no viable overloaded operator or we matched a 1723 // built-in operator. In either case, fall through to trying to 1724 // build a built-in operation. 1725 } 1726 1727 // Perform default conversions. 1728 DefaultFunctionArrayConversion(LHSExp); 1729 DefaultFunctionArrayConversion(RHSExp); 1730 1731 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1732 1733 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1734 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1735 // in the subscript position. As a result, we need to derive the array base 1736 // and index from the expression types. 1737 Expr *BaseExpr, *IndexExpr; 1738 QualType ResultType; 1739 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1740 BaseExpr = LHSExp; 1741 IndexExpr = RHSExp; 1742 ResultType = Context.DependentTy; 1743 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1744 BaseExpr = LHSExp; 1745 IndexExpr = RHSExp; 1746 ResultType = PTy->getPointeeType(); 1747 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1748 // Handle the uncommon case of "123[Ptr]". 1749 BaseExpr = RHSExp; 1750 IndexExpr = LHSExp; 1751 ResultType = PTy->getPointeeType(); 1752 } else if (const ObjCObjectPointerType *PTy = 1753 LHSTy->getAsObjCObjectPointerType()) { 1754 BaseExpr = LHSExp; 1755 IndexExpr = RHSExp; 1756 ResultType = PTy->getPointeeType(); 1757 } else if (const ObjCObjectPointerType *PTy = 1758 RHSTy->getAsObjCObjectPointerType()) { 1759 // Handle the uncommon case of "123[Ptr]". 1760 BaseExpr = RHSExp; 1761 IndexExpr = LHSExp; 1762 ResultType = PTy->getPointeeType(); 1763 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1764 BaseExpr = LHSExp; // vectors: V[123] 1765 IndexExpr = RHSExp; 1766 1767 // FIXME: need to deal with const... 1768 ResultType = VTy->getElementType(); 1769 } else if (LHSTy->isArrayType()) { 1770 // If we see an array that wasn't promoted by 1771 // DefaultFunctionArrayConversion, it must be an array that 1772 // wasn't promoted because of the C90 rule that doesn't 1773 // allow promoting non-lvalue arrays. Warn, then 1774 // force the promotion here. 1775 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1776 LHSExp->getSourceRange(); 1777 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1778 LHSTy = LHSExp->getType(); 1779 1780 BaseExpr = LHSExp; 1781 IndexExpr = RHSExp; 1782 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1783 } else if (RHSTy->isArrayType()) { 1784 // Same as previous, except for 123[f().a] case 1785 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1786 RHSExp->getSourceRange(); 1787 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1788 RHSTy = RHSExp->getType(); 1789 1790 BaseExpr = RHSExp; 1791 IndexExpr = LHSExp; 1792 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1793 } else { 1794 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1795 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1796 } 1797 // C99 6.5.2.1p1 1798 if (!(IndexExpr->getType()->isIntegerType() && 1799 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1800 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1801 << IndexExpr->getSourceRange()); 1802 1803 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1804 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1805 // type. Note that Functions are not objects, and that (in C99 parlance) 1806 // incomplete types are not object types. 1807 if (ResultType->isFunctionType()) { 1808 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1809 << ResultType << BaseExpr->getSourceRange(); 1810 return ExprError(); 1811 } 1812 1813 if (!ResultType->isDependentType() && 1814 RequireCompleteType(LLoc, ResultType, 1815 PDiag(diag::err_subscript_incomplete_type) 1816 << BaseExpr->getSourceRange())) 1817 return ExprError(); 1818 1819 // Diagnose bad cases where we step over interface counts. 1820 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1821 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1822 << ResultType << BaseExpr->getSourceRange(); 1823 return ExprError(); 1824 } 1825 1826 Base.release(); 1827 Idx.release(); 1828 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1829 ResultType, RLoc)); 1830} 1831 1832QualType Sema:: 1833CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1834 const IdentifierInfo *CompName, 1835 SourceLocation CompLoc) { 1836 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1837 1838 // The vector accessor can't exceed the number of elements. 1839 const char *compStr = CompName->getName(); 1840 1841 // This flag determines whether or not the component is one of the four 1842 // special names that indicate a subset of exactly half the elements are 1843 // to be selected. 1844 bool HalvingSwizzle = false; 1845 1846 // This flag determines whether or not CompName has an 's' char prefix, 1847 // indicating that it is a string of hex values to be used as vector indices. 1848 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1849 1850 // Check that we've found one of the special components, or that the component 1851 // names must come from the same set. 1852 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1853 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1854 HalvingSwizzle = true; 1855 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1856 do 1857 compStr++; 1858 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1859 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1860 do 1861 compStr++; 1862 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1863 } 1864 1865 if (!HalvingSwizzle && *compStr) { 1866 // We didn't get to the end of the string. This means the component names 1867 // didn't come from the same set *or* we encountered an illegal name. 1868 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1869 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1870 return QualType(); 1871 } 1872 1873 // Ensure no component accessor exceeds the width of the vector type it 1874 // operates on. 1875 if (!HalvingSwizzle) { 1876 compStr = CompName->getName(); 1877 1878 if (HexSwizzle) 1879 compStr++; 1880 1881 while (*compStr) { 1882 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1883 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1884 << baseType << SourceRange(CompLoc); 1885 return QualType(); 1886 } 1887 } 1888 } 1889 1890 // If this is a halving swizzle, verify that the base type has an even 1891 // number of elements. 1892 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1893 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1894 << baseType << SourceRange(CompLoc); 1895 return QualType(); 1896 } 1897 1898 // The component accessor looks fine - now we need to compute the actual type. 1899 // The vector type is implied by the component accessor. For example, 1900 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1901 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1902 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1903 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1904 : CompName->getLength(); 1905 if (HexSwizzle) 1906 CompSize--; 1907 1908 if (CompSize == 1) 1909 return vecType->getElementType(); 1910 1911 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1912 // Now look up the TypeDefDecl from the vector type. Without this, 1913 // diagostics look bad. We want extended vector types to appear built-in. 1914 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1915 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1916 return Context.getTypedefType(ExtVectorDecls[i]); 1917 } 1918 return VT; // should never get here (a typedef type should always be found). 1919} 1920 1921static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1922 IdentifierInfo *Member, 1923 const Selector &Sel, 1924 ASTContext &Context) { 1925 1926 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1927 return PD; 1928 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1929 return OMD; 1930 1931 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1932 E = PDecl->protocol_end(); I != E; ++I) { 1933 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1934 Context)) 1935 return D; 1936 } 1937 return 0; 1938} 1939 1940static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1941 IdentifierInfo *Member, 1942 const Selector &Sel, 1943 ASTContext &Context) { 1944 // Check protocols on qualified interfaces. 1945 Decl *GDecl = 0; 1946 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1947 E = QIdTy->qual_end(); I != E; ++I) { 1948 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1949 GDecl = PD; 1950 break; 1951 } 1952 // Also must look for a getter name which uses property syntax. 1953 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1954 GDecl = OMD; 1955 break; 1956 } 1957 } 1958 if (!GDecl) { 1959 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1960 E = QIdTy->qual_end(); I != E; ++I) { 1961 // Search in the protocol-qualifier list of current protocol. 1962 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1963 if (GDecl) 1964 return GDecl; 1965 } 1966 } 1967 return GDecl; 1968} 1969 1970/// FindMethodInNestedImplementations - Look up a method in current and 1971/// all base class implementations. 1972/// 1973ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1974 const ObjCInterfaceDecl *IFace, 1975 const Selector &Sel) { 1976 ObjCMethodDecl *Method = 0; 1977 if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation()) 1978 Method = ImpDecl->getInstanceMethod(Sel); 1979 1980 if (!Method && IFace->getSuperClass()) 1981 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1982 return Method; 1983} 1984 1985Action::OwningExprResult 1986Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1987 tok::TokenKind OpKind, SourceLocation MemberLoc, 1988 DeclarationName MemberName, 1989 bool HasExplicitTemplateArgs, 1990 SourceLocation LAngleLoc, 1991 const TemplateArgument *ExplicitTemplateArgs, 1992 unsigned NumExplicitTemplateArgs, 1993 SourceLocation RAngleLoc, 1994 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 1995 NamedDecl *FirstQualifierInScope) { 1996 if (SS && SS->isInvalid()) 1997 return ExprError(); 1998 1999 // Since this might be a postfix expression, get rid of ParenListExprs. 2000 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 2001 2002 Expr *BaseExpr = Base.takeAs<Expr>(); 2003 assert(BaseExpr && "no base expression"); 2004 2005 // Perform default conversions. 2006 DefaultFunctionArrayConversion(BaseExpr); 2007 2008 QualType BaseType = BaseExpr->getType(); 2009 // If this is an Objective-C pseudo-builtin and a definition is provided then 2010 // use that. 2011 if (BaseType->isObjCIdType()) { 2012 // We have an 'id' type. Rather than fall through, we check if this 2013 // is a reference to 'isa'. 2014 if (BaseType != Context.ObjCIdRedefinitionType) { 2015 BaseType = Context.ObjCIdRedefinitionType; 2016 ImpCastExprToType(BaseExpr, BaseType); 2017 } 2018 } else if (BaseType->isObjCClassType() && 2019 BaseType != Context.ObjCClassRedefinitionType) { 2020 BaseType = Context.ObjCClassRedefinitionType; 2021 ImpCastExprToType(BaseExpr, BaseType); 2022 } 2023 assert(!BaseType.isNull() && "no type for member expression"); 2024 2025 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2026 // must have pointer type, and the accessed type is the pointee. 2027 if (OpKind == tok::arrow) { 2028 if (BaseType->isDependentType()) { 2029 NestedNameSpecifier *Qualifier = 0; 2030 if (SS) { 2031 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2032 if (!FirstQualifierInScope) 2033 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2034 } 2035 2036 return Owned(CXXUnresolvedMemberExpr::Create(Context, BaseExpr, true, 2037 OpLoc, Qualifier, 2038 SS? SS->getRange() : SourceRange(), 2039 FirstQualifierInScope, 2040 MemberName, 2041 MemberLoc, 2042 HasExplicitTemplateArgs, 2043 LAngleLoc, 2044 ExplicitTemplateArgs, 2045 NumExplicitTemplateArgs, 2046 RAngleLoc)); 2047 } 2048 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 2049 BaseType = PT->getPointeeType(); 2050 else if (BaseType->isObjCObjectPointerType()) 2051 ; 2052 else 2053 return ExprError(Diag(MemberLoc, 2054 diag::err_typecheck_member_reference_arrow) 2055 << BaseType << BaseExpr->getSourceRange()); 2056 } else { 2057 if (BaseType->isDependentType()) { 2058 // Require that the base type isn't a pointer type 2059 // (so we'll report an error for) 2060 // T* t; 2061 // t.f; 2062 // 2063 // In Obj-C++, however, the above expression is valid, since it could be 2064 // accessing the 'f' property if T is an Obj-C interface. The extra check 2065 // allows this, while still reporting an error if T is a struct pointer. 2066 const PointerType *PT = BaseType->getAs<PointerType>(); 2067 2068 if (!PT || (getLangOptions().ObjC1 && 2069 !PT->getPointeeType()->isRecordType())) { 2070 NestedNameSpecifier *Qualifier = 0; 2071 if (SS) { 2072 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2073 if (!FirstQualifierInScope) 2074 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2075 } 2076 2077 return Owned(CXXUnresolvedMemberExpr::Create(Context, 2078 BaseExpr, false, 2079 OpLoc, 2080 Qualifier, 2081 SS? SS->getRange() : SourceRange(), 2082 FirstQualifierInScope, 2083 MemberName, 2084 MemberLoc, 2085 HasExplicitTemplateArgs, 2086 LAngleLoc, 2087 ExplicitTemplateArgs, 2088 NumExplicitTemplateArgs, 2089 RAngleLoc)); 2090 } 2091 } 2092 } 2093 2094 // Handle field access to simple records. This also handles access to fields 2095 // of the ObjC 'id' struct. 2096 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2097 RecordDecl *RDecl = RTy->getDecl(); 2098 if (RequireCompleteType(OpLoc, BaseType, 2099 PDiag(diag::err_typecheck_incomplete_tag) 2100 << BaseExpr->getSourceRange())) 2101 return ExprError(); 2102 2103 DeclContext *DC = RDecl; 2104 if (SS && SS->isSet()) { 2105 // If the member name was a qualified-id, look into the 2106 // nested-name-specifier. 2107 DC = computeDeclContext(*SS, false); 2108 2109 // FIXME: If DC is not computable, we should build a 2110 // CXXUnresolvedMemberExpr. 2111 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2112 } 2113 2114 // The record definition is complete, now make sure the member is valid. 2115 LookupResult Result 2116 = LookupQualifiedName(DC, MemberName, LookupMemberName, false); 2117 2118 if (!Result) 2119 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member_deprecated) 2120 << MemberName << BaseExpr->getSourceRange()); 2121 if (Result.isAmbiguous()) { 2122 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2123 BaseExpr->getSourceRange()); 2124 return ExprError(); 2125 } 2126 2127 if (SS && SS->isSet()) { 2128 QualType BaseTypeCanon 2129 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2130 QualType MemberTypeCanon 2131 = Context.getCanonicalType( 2132 Context.getTypeDeclType( 2133 dyn_cast<TypeDecl>(Result.getAsDecl()->getDeclContext()))); 2134 2135 if (BaseTypeCanon != MemberTypeCanon && 2136 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2137 return ExprError(Diag(SS->getBeginLoc(), 2138 diag::err_not_direct_base_or_virtual) 2139 << MemberTypeCanon << BaseTypeCanon); 2140 } 2141 2142 NamedDecl *MemberDecl = Result; 2143 2144 // If the decl being referenced had an error, return an error for this 2145 // sub-expr without emitting another error, in order to avoid cascading 2146 // error cases. 2147 if (MemberDecl->isInvalidDecl()) 2148 return ExprError(); 2149 2150 bool ShouldCheckUse = true; 2151 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { 2152 // Don't diagnose the use of a virtual member function unless it's 2153 // explicitly qualified. 2154 if (MD->isVirtual() && (!SS || !SS->isSet())) 2155 ShouldCheckUse = false; 2156 } 2157 2158 // Check the use of this field 2159 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2160 return ExprError(); 2161 2162 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2163 // We may have found a field within an anonymous union or struct 2164 // (C++ [class.union]). 2165 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2166 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2167 BaseExpr, OpLoc); 2168 2169 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2170 QualType MemberType = FD->getType(); 2171 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2172 MemberType = Ref->getPointeeType(); 2173 else { 2174 unsigned BaseAddrSpace = BaseType.getAddressSpace(); 2175 unsigned combinedQualifiers = 2176 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2177 if (FD->isMutable()) 2178 combinedQualifiers &= ~QualType::Const; 2179 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2180 if (BaseAddrSpace != MemberType.getAddressSpace()) 2181 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 2182 } 2183 2184 MarkDeclarationReferenced(MemberLoc, FD); 2185 if (PerformObjectMemberConversion(BaseExpr, FD)) 2186 return ExprError(); 2187 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2188 FD, MemberLoc, MemberType)); 2189 } 2190 2191 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2192 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2193 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2194 Var, MemberLoc, 2195 Var->getType().getNonReferenceType())); 2196 } 2197 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2198 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2199 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2200 MemberFn, MemberLoc, 2201 MemberFn->getType())); 2202 } 2203 if (FunctionTemplateDecl *FunTmpl 2204 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2205 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2206 2207 if (HasExplicitTemplateArgs) 2208 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2209 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2210 SS? SS->getRange() : SourceRange(), 2211 FunTmpl, MemberLoc, true, 2212 LAngleLoc, ExplicitTemplateArgs, 2213 NumExplicitTemplateArgs, RAngleLoc, 2214 Context.OverloadTy)); 2215 2216 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2217 FunTmpl, MemberLoc, 2218 Context.OverloadTy)); 2219 } 2220 if (OverloadedFunctionDecl *Ovl 2221 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2222 if (HasExplicitTemplateArgs) 2223 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2224 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2225 SS? SS->getRange() : SourceRange(), 2226 Ovl, MemberLoc, true, 2227 LAngleLoc, ExplicitTemplateArgs, 2228 NumExplicitTemplateArgs, RAngleLoc, 2229 Context.OverloadTy)); 2230 2231 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2232 Ovl, MemberLoc, Context.OverloadTy)); 2233 } 2234 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2235 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2236 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2237 Enum, MemberLoc, Enum->getType())); 2238 } 2239 if (isa<TypeDecl>(MemberDecl)) 2240 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2241 << MemberName << int(OpKind == tok::arrow)); 2242 2243 // We found a declaration kind that we didn't expect. This is a 2244 // generic error message that tells the user that she can't refer 2245 // to this member with '.' or '->'. 2246 return ExprError(Diag(MemberLoc, 2247 diag::err_typecheck_member_reference_unknown) 2248 << MemberName << int(OpKind == tok::arrow)); 2249 } 2250 2251 // Handle pseudo-destructors (C++ [expr.pseudo]). Since anything referring 2252 // into a record type was handled above, any destructor we see here is a 2253 // pseudo-destructor. 2254 if (MemberName.getNameKind() == DeclarationName::CXXDestructorName) { 2255 // C++ [expr.pseudo]p2: 2256 // The left hand side of the dot operator shall be of scalar type. The 2257 // left hand side of the arrow operator shall be of pointer to scalar 2258 // type. 2259 if (!BaseType->isScalarType()) 2260 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 2261 << BaseType << BaseExpr->getSourceRange()); 2262 2263 // [...] The type designated by the pseudo-destructor-name shall be the 2264 // same as the object type. 2265 if (!MemberName.getCXXNameType()->isDependentType() && 2266 !Context.hasSameUnqualifiedType(BaseType, MemberName.getCXXNameType())) 2267 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_type_mismatch) 2268 << BaseType << MemberName.getCXXNameType() 2269 << BaseExpr->getSourceRange() << SourceRange(MemberLoc)); 2270 2271 // [...] Furthermore, the two type-names in a pseudo-destructor-name of 2272 // the form 2273 // 2274 // ::[opt] nested-name-specifier[opt] type-name :: ̃ type-name 2275 // 2276 // shall designate the same scalar type. 2277 // 2278 // FIXME: DPG can't see any way to trigger this particular clause, so it 2279 // isn't checked here. 2280 2281 // FIXME: We've lost the precise spelling of the type by going through 2282 // DeclarationName. Can we do better? 2283 return Owned(new (Context) CXXPseudoDestructorExpr(Context, BaseExpr, 2284 OpKind == tok::arrow, 2285 OpLoc, 2286 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2287 SS? SS->getRange() : SourceRange(), 2288 MemberName.getCXXNameType(), 2289 MemberLoc)); 2290 } 2291 2292 // Handle properties on ObjC 'Class' types. 2293 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2294 // Also must look for a getter name which uses property syntax. 2295 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2296 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2297 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2298 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2299 ObjCMethodDecl *Getter; 2300 // FIXME: need to also look locally in the implementation. 2301 if ((Getter = IFace->lookupClassMethod(Sel))) { 2302 // Check the use of this method. 2303 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2304 return ExprError(); 2305 } 2306 // If we found a getter then this may be a valid dot-reference, we 2307 // will look for the matching setter, in case it is needed. 2308 Selector SetterSel = 2309 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2310 PP.getSelectorTable(), Member); 2311 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2312 if (!Setter) { 2313 // If this reference is in an @implementation, also check for 'private' 2314 // methods. 2315 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2316 } 2317 // Look through local category implementations associated with the class. 2318 if (!Setter) 2319 Setter = IFace->getCategoryClassMethod(SetterSel); 2320 2321 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2322 return ExprError(); 2323 2324 if (Getter || Setter) { 2325 QualType PType; 2326 2327 if (Getter) 2328 PType = Getter->getResultType(); 2329 else 2330 // Get the expression type from Setter's incoming parameter. 2331 PType = (*(Setter->param_end() -1))->getType(); 2332 // FIXME: we must check that the setter has property type. 2333 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2334 Setter, MemberLoc, BaseExpr)); 2335 } 2336 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2337 << MemberName << BaseType); 2338 } 2339 } 2340 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2341 // (*Obj).ivar. 2342 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2343 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2344 const ObjCObjectPointerType *OPT = BaseType->getAsObjCObjectPointerType(); 2345 const ObjCInterfaceType *IFaceT = 2346 OPT ? OPT->getInterfaceType() : BaseType->getAsObjCInterfaceType(); 2347 if (IFaceT) { 2348 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2349 2350 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2351 ObjCInterfaceDecl *ClassDeclared; 2352 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2353 2354 if (IV) { 2355 // If the decl being referenced had an error, return an error for this 2356 // sub-expr without emitting another error, in order to avoid cascading 2357 // error cases. 2358 if (IV->isInvalidDecl()) 2359 return ExprError(); 2360 2361 // Check whether we can reference this field. 2362 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2363 return ExprError(); 2364 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2365 IV->getAccessControl() != ObjCIvarDecl::Package) { 2366 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2367 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2368 ClassOfMethodDecl = MD->getClassInterface(); 2369 else if (ObjCImpDecl && getCurFunctionDecl()) { 2370 // Case of a c-function declared inside an objc implementation. 2371 // FIXME: For a c-style function nested inside an objc implementation 2372 // class, there is no implementation context available, so we pass 2373 // down the context as argument to this routine. Ideally, this context 2374 // need be passed down in the AST node and somehow calculated from the 2375 // AST for a function decl. 2376 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2377 if (ObjCImplementationDecl *IMPD = 2378 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2379 ClassOfMethodDecl = IMPD->getClassInterface(); 2380 else if (ObjCCategoryImplDecl* CatImplClass = 2381 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2382 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2383 } 2384 2385 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2386 if (ClassDeclared != IDecl || 2387 ClassOfMethodDecl != ClassDeclared) 2388 Diag(MemberLoc, diag::error_private_ivar_access) 2389 << IV->getDeclName(); 2390 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2391 // @protected 2392 Diag(MemberLoc, diag::error_protected_ivar_access) 2393 << IV->getDeclName(); 2394 } 2395 2396 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2397 MemberLoc, BaseExpr, 2398 OpKind == tok::arrow)); 2399 } 2400 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2401 << IDecl->getDeclName() << MemberName 2402 << BaseExpr->getSourceRange()); 2403 } 2404 } 2405 // Handle properties on 'id' and qualified "id". 2406 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2407 BaseType->isObjCQualifiedIdType())) { 2408 const ObjCObjectPointerType *QIdTy = BaseType->getAsObjCObjectPointerType(); 2409 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2410 2411 // Check protocols on qualified interfaces. 2412 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2413 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2414 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2415 // Check the use of this declaration 2416 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2417 return ExprError(); 2418 2419 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2420 MemberLoc, BaseExpr)); 2421 } 2422 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2423 // Check the use of this method. 2424 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2425 return ExprError(); 2426 2427 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2428 OMD->getResultType(), 2429 OMD, OpLoc, MemberLoc, 2430 NULL, 0)); 2431 } 2432 } 2433 2434 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2435 << MemberName << BaseType); 2436 } 2437 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2438 // pointer to a (potentially qualified) interface type. 2439 const ObjCObjectPointerType *OPT; 2440 if (OpKind == tok::period && 2441 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2442 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2443 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2444 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2445 2446 // Search for a declared property first. 2447 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2448 // Check whether we can reference this property. 2449 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2450 return ExprError(); 2451 QualType ResTy = PD->getType(); 2452 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2453 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2454 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2455 ResTy = Getter->getResultType(); 2456 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2457 MemberLoc, BaseExpr)); 2458 } 2459 // Check protocols on qualified interfaces. 2460 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2461 E = OPT->qual_end(); I != E; ++I) 2462 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2463 // Check whether we can reference this property. 2464 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2465 return ExprError(); 2466 2467 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2468 MemberLoc, BaseExpr)); 2469 } 2470 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2471 E = OPT->qual_end(); I != E; ++I) 2472 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2473 // Check whether we can reference this property. 2474 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2475 return ExprError(); 2476 2477 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2478 MemberLoc, BaseExpr)); 2479 } 2480 // If that failed, look for an "implicit" property by seeing if the nullary 2481 // selector is implemented. 2482 2483 // FIXME: The logic for looking up nullary and unary selectors should be 2484 // shared with the code in ActOnInstanceMessage. 2485 2486 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2487 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2488 2489 // If this reference is in an @implementation, check for 'private' methods. 2490 if (!Getter) 2491 Getter = FindMethodInNestedImplementations(IFace, Sel); 2492 2493 // Look through local category implementations associated with the class. 2494 if (!Getter) 2495 Getter = IFace->getCategoryInstanceMethod(Sel); 2496 if (Getter) { 2497 // Check if we can reference this property. 2498 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2499 return ExprError(); 2500 } 2501 // If we found a getter then this may be a valid dot-reference, we 2502 // will look for the matching setter, in case it is needed. 2503 Selector SetterSel = 2504 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2505 PP.getSelectorTable(), Member); 2506 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2507 if (!Setter) { 2508 // If this reference is in an @implementation, also check for 'private' 2509 // methods. 2510 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2511 } 2512 // Look through local category implementations associated with the class. 2513 if (!Setter) 2514 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2515 2516 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2517 return ExprError(); 2518 2519 if (Getter || Setter) { 2520 QualType PType; 2521 2522 if (Getter) 2523 PType = Getter->getResultType(); 2524 else 2525 // Get the expression type from Setter's incoming parameter. 2526 PType = (*(Setter->param_end() -1))->getType(); 2527 // FIXME: we must check that the setter has property type. 2528 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2529 Setter, MemberLoc, BaseExpr)); 2530 } 2531 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2532 << MemberName << BaseType); 2533 } 2534 2535 // Handle the following exceptional case (*Obj).isa. 2536 if (OpKind == tok::period && 2537 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2538 MemberName.getAsIdentifierInfo()->isStr("isa")) 2539 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2540 Context.getObjCIdType())); 2541 2542 // Handle 'field access' to vectors, such as 'V.xx'. 2543 if (BaseType->isExtVectorType()) { 2544 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2545 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2546 if (ret.isNull()) 2547 return ExprError(); 2548 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2549 MemberLoc)); 2550 } 2551 2552 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2553 << BaseType << BaseExpr->getSourceRange(); 2554 2555 // If the user is trying to apply -> or . to a function or function 2556 // pointer, it's probably because they forgot parentheses to call 2557 // the function. Suggest the addition of those parentheses. 2558 if (BaseType == Context.OverloadTy || 2559 BaseType->isFunctionType() || 2560 (BaseType->isPointerType() && 2561 BaseType->getAs<PointerType>()->isFunctionType())) { 2562 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2563 Diag(Loc, diag::note_member_reference_needs_call) 2564 << CodeModificationHint::CreateInsertion(Loc, "()"); 2565 } 2566 2567 return ExprError(); 2568} 2569 2570Action::OwningExprResult 2571Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2572 tok::TokenKind OpKind, SourceLocation MemberLoc, 2573 IdentifierInfo &Member, 2574 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS) { 2575 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, MemberLoc, 2576 DeclarationName(&Member), ObjCImpDecl, SS); 2577} 2578 2579Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2580 FunctionDecl *FD, 2581 ParmVarDecl *Param) { 2582 if (Param->hasUnparsedDefaultArg()) { 2583 Diag (CallLoc, 2584 diag::err_use_of_default_argument_to_function_declared_later) << 2585 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2586 Diag(UnparsedDefaultArgLocs[Param], 2587 diag::note_default_argument_declared_here); 2588 } else { 2589 if (Param->hasUninstantiatedDefaultArg()) { 2590 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2591 2592 // Instantiate the expression. 2593 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2594 2595 InstantiatingTemplate Inst(*this, CallLoc, Param, 2596 ArgList.getInnermost().getFlatArgumentList(), 2597 ArgList.getInnermost().flat_size()); 2598 2599 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2600 if (Result.isInvalid()) 2601 return ExprError(); 2602 2603 if (SetParamDefaultArgument(Param, move(Result), 2604 /*FIXME:EqualLoc*/ 2605 UninstExpr->getSourceRange().getBegin())) 2606 return ExprError(); 2607 } 2608 2609 Expr *DefaultExpr = Param->getDefaultArg(); 2610 2611 // If the default expression creates temporaries, we need to 2612 // push them to the current stack of expression temporaries so they'll 2613 // be properly destroyed. 2614 if (CXXExprWithTemporaries *E 2615 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2616 assert(!E->shouldDestroyTemporaries() && 2617 "Can't destroy temporaries in a default argument expr!"); 2618 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2619 ExprTemporaries.push_back(E->getTemporary(I)); 2620 } 2621 } 2622 2623 // We already type-checked the argument, so we know it works. 2624 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2625} 2626 2627/// ConvertArgumentsForCall - Converts the arguments specified in 2628/// Args/NumArgs to the parameter types of the function FDecl with 2629/// function prototype Proto. Call is the call expression itself, and 2630/// Fn is the function expression. For a C++ member function, this 2631/// routine does not attempt to convert the object argument. Returns 2632/// true if the call is ill-formed. 2633bool 2634Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2635 FunctionDecl *FDecl, 2636 const FunctionProtoType *Proto, 2637 Expr **Args, unsigned NumArgs, 2638 SourceLocation RParenLoc) { 2639 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2640 // assignment, to the types of the corresponding parameter, ... 2641 unsigned NumArgsInProto = Proto->getNumArgs(); 2642 unsigned NumArgsToCheck = NumArgs; 2643 bool Invalid = false; 2644 2645 // If too few arguments are available (and we don't have default 2646 // arguments for the remaining parameters), don't make the call. 2647 if (NumArgs < NumArgsInProto) { 2648 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2649 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2650 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2651 // Use default arguments for missing arguments 2652 NumArgsToCheck = NumArgsInProto; 2653 Call->setNumArgs(Context, NumArgsInProto); 2654 } 2655 2656 // If too many are passed and not variadic, error on the extras and drop 2657 // them. 2658 if (NumArgs > NumArgsInProto) { 2659 if (!Proto->isVariadic()) { 2660 Diag(Args[NumArgsInProto]->getLocStart(), 2661 diag::err_typecheck_call_too_many_args) 2662 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2663 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2664 Args[NumArgs-1]->getLocEnd()); 2665 // This deletes the extra arguments. 2666 Call->setNumArgs(Context, NumArgsInProto); 2667 Invalid = true; 2668 } 2669 NumArgsToCheck = NumArgsInProto; 2670 } 2671 2672 // Continue to check argument types (even if we have too few/many args). 2673 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2674 QualType ProtoArgType = Proto->getArgType(i); 2675 2676 Expr *Arg; 2677 if (i < NumArgs) { 2678 Arg = Args[i]; 2679 2680 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2681 ProtoArgType, 2682 PDiag(diag::err_call_incomplete_argument) 2683 << Arg->getSourceRange())) 2684 return true; 2685 2686 // Pass the argument. 2687 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2688 return true; 2689 } else { 2690 ParmVarDecl *Param = FDecl->getParamDecl(i); 2691 2692 OwningExprResult ArgExpr = 2693 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2694 FDecl, Param); 2695 if (ArgExpr.isInvalid()) 2696 return true; 2697 2698 Arg = ArgExpr.takeAs<Expr>(); 2699 } 2700 2701 Call->setArg(i, Arg); 2702 } 2703 2704 // If this is a variadic call, handle args passed through "...". 2705 if (Proto->isVariadic()) { 2706 VariadicCallType CallType = VariadicFunction; 2707 if (Fn->getType()->isBlockPointerType()) 2708 CallType = VariadicBlock; // Block 2709 else if (isa<MemberExpr>(Fn)) 2710 CallType = VariadicMethod; 2711 2712 // Promote the arguments (C99 6.5.2.2p7). 2713 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2714 Expr *Arg = Args[i]; 2715 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2716 Call->setArg(i, Arg); 2717 } 2718 } 2719 2720 return Invalid; 2721} 2722 2723/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2724/// This provides the location of the left/right parens and a list of comma 2725/// locations. 2726Action::OwningExprResult 2727Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2728 MultiExprArg args, 2729 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2730 unsigned NumArgs = args.size(); 2731 2732 // Since this might be a postfix expression, get rid of ParenListExprs. 2733 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2734 2735 Expr *Fn = fn.takeAs<Expr>(); 2736 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2737 assert(Fn && "no function call expression"); 2738 FunctionDecl *FDecl = NULL; 2739 NamedDecl *NDecl = NULL; 2740 DeclarationName UnqualifiedName; 2741 2742 if (getLangOptions().CPlusPlus) { 2743 // If this is a pseudo-destructor expression, build the call immediately. 2744 if (isa<CXXPseudoDestructorExpr>(Fn)) { 2745 if (NumArgs > 0) { 2746 // Pseudo-destructor calls should not have any arguments. 2747 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args) 2748 << CodeModificationHint::CreateRemoval( 2749 SourceRange(Args[0]->getLocStart(), 2750 Args[NumArgs-1]->getLocEnd())); 2751 2752 for (unsigned I = 0; I != NumArgs; ++I) 2753 Args[I]->Destroy(Context); 2754 2755 NumArgs = 0; 2756 } 2757 2758 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy, 2759 RParenLoc)); 2760 } 2761 2762 // Determine whether this is a dependent call inside a C++ template, 2763 // in which case we won't do any semantic analysis now. 2764 // FIXME: Will need to cache the results of name lookup (including ADL) in 2765 // Fn. 2766 bool Dependent = false; 2767 if (Fn->isTypeDependent()) 2768 Dependent = true; 2769 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2770 Dependent = true; 2771 2772 if (Dependent) 2773 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2774 Context.DependentTy, RParenLoc)); 2775 2776 // Determine whether this is a call to an object (C++ [over.call.object]). 2777 if (Fn->getType()->isRecordType()) 2778 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2779 CommaLocs, RParenLoc)); 2780 2781 // Determine whether this is a call to a member function. 2782 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2783 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2784 if (isa<OverloadedFunctionDecl>(MemDecl) || 2785 isa<CXXMethodDecl>(MemDecl) || 2786 (isa<FunctionTemplateDecl>(MemDecl) && 2787 isa<CXXMethodDecl>( 2788 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2789 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2790 CommaLocs, RParenLoc)); 2791 } 2792 } 2793 2794 // If we're directly calling a function, get the appropriate declaration. 2795 // Also, in C++, keep track of whether we should perform argument-dependent 2796 // lookup and whether there were any explicitly-specified template arguments. 2797 Expr *FnExpr = Fn; 2798 bool ADL = true; 2799 bool HasExplicitTemplateArgs = 0; 2800 const TemplateArgument *ExplicitTemplateArgs = 0; 2801 unsigned NumExplicitTemplateArgs = 0; 2802 while (true) { 2803 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2804 FnExpr = IcExpr->getSubExpr(); 2805 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2806 // Parentheses around a function disable ADL 2807 // (C++0x [basic.lookup.argdep]p1). 2808 ADL = false; 2809 FnExpr = PExpr->getSubExpr(); 2810 } else if (isa<UnaryOperator>(FnExpr) && 2811 cast<UnaryOperator>(FnExpr)->getOpcode() 2812 == UnaryOperator::AddrOf) { 2813 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2814 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2815 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2816 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2817 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2818 break; 2819 } else if (UnresolvedFunctionNameExpr *DepName 2820 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2821 UnqualifiedName = DepName->getName(); 2822 break; 2823 } else if (TemplateIdRefExpr *TemplateIdRef 2824 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2825 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2826 if (!NDecl) 2827 NDecl = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2828 HasExplicitTemplateArgs = true; 2829 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2830 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2831 2832 // C++ [temp.arg.explicit]p6: 2833 // [Note: For simple function names, argument dependent lookup (3.4.2) 2834 // applies even when the function name is not visible within the 2835 // scope of the call. This is because the call still has the syntactic 2836 // form of a function call (3.4.1). But when a function template with 2837 // explicit template arguments is used, the call does not have the 2838 // correct syntactic form unless there is a function template with 2839 // that name visible at the point of the call. If no such name is 2840 // visible, the call is not syntactically well-formed and 2841 // argument-dependent lookup does not apply. If some such name is 2842 // visible, argument dependent lookup applies and additional function 2843 // templates may be found in other namespaces. 2844 // 2845 // The summary of this paragraph is that, if we get to this point and the 2846 // template-id was not a qualified name, then argument-dependent lookup 2847 // is still possible. 2848 if (TemplateIdRef->getQualifier()) 2849 ADL = false; 2850 break; 2851 } else { 2852 // Any kind of name that does not refer to a declaration (or 2853 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2854 ADL = false; 2855 break; 2856 } 2857 } 2858 2859 OverloadedFunctionDecl *Ovl = 0; 2860 FunctionTemplateDecl *FunctionTemplate = 0; 2861 if (NDecl) { 2862 FDecl = dyn_cast<FunctionDecl>(NDecl); 2863 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2864 FDecl = FunctionTemplate->getTemplatedDecl(); 2865 else 2866 FDecl = dyn_cast<FunctionDecl>(NDecl); 2867 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2868 } 2869 2870 if (Ovl || FunctionTemplate || 2871 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2872 // We don't perform ADL for implicit declarations of builtins. 2873 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2874 ADL = false; 2875 2876 // We don't perform ADL in C. 2877 if (!getLangOptions().CPlusPlus) 2878 ADL = false; 2879 2880 if (Ovl || FunctionTemplate || ADL) { 2881 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2882 HasExplicitTemplateArgs, 2883 ExplicitTemplateArgs, 2884 NumExplicitTemplateArgs, 2885 LParenLoc, Args, NumArgs, CommaLocs, 2886 RParenLoc, ADL); 2887 if (!FDecl) 2888 return ExprError(); 2889 2890 // Update Fn to refer to the actual function selected. 2891 Expr *NewFn = 0; 2892 if (QualifiedDeclRefExpr *QDRExpr 2893 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2894 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2895 QDRExpr->getLocation(), 2896 false, false, 2897 QDRExpr->getQualifierRange(), 2898 QDRExpr->getQualifier()); 2899 else 2900 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2901 Fn->getSourceRange().getBegin()); 2902 Fn->Destroy(Context); 2903 Fn = NewFn; 2904 } 2905 } 2906 2907 // Promote the function operand. 2908 UsualUnaryConversions(Fn); 2909 2910 // Make the call expr early, before semantic checks. This guarantees cleanup 2911 // of arguments and function on error. 2912 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2913 Args, NumArgs, 2914 Context.BoolTy, 2915 RParenLoc)); 2916 2917 const FunctionType *FuncT; 2918 if (!Fn->getType()->isBlockPointerType()) { 2919 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2920 // have type pointer to function". 2921 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 2922 if (PT == 0) 2923 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2924 << Fn->getType() << Fn->getSourceRange()); 2925 FuncT = PT->getPointeeType()->getAsFunctionType(); 2926 } else { // This is a block call. 2927 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 2928 getAsFunctionType(); 2929 } 2930 if (FuncT == 0) 2931 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2932 << Fn->getType() << Fn->getSourceRange()); 2933 2934 // Check for a valid return type 2935 if (!FuncT->getResultType()->isVoidType() && 2936 RequireCompleteType(Fn->getSourceRange().getBegin(), 2937 FuncT->getResultType(), 2938 PDiag(diag::err_call_incomplete_return) 2939 << TheCall->getSourceRange())) 2940 return ExprError(); 2941 2942 // We know the result type of the call, set it. 2943 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2944 2945 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2946 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2947 RParenLoc)) 2948 return ExprError(); 2949 } else { 2950 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2951 2952 if (FDecl) { 2953 // Check if we have too few/too many template arguments, based 2954 // on our knowledge of the function definition. 2955 const FunctionDecl *Def = 0; 2956 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2957 const FunctionProtoType *Proto = 2958 Def->getType()->getAsFunctionProtoType(); 2959 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2960 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2961 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2962 } 2963 } 2964 } 2965 2966 // Promote the arguments (C99 6.5.2.2p6). 2967 for (unsigned i = 0; i != NumArgs; i++) { 2968 Expr *Arg = Args[i]; 2969 DefaultArgumentPromotion(Arg); 2970 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2971 Arg->getType(), 2972 PDiag(diag::err_call_incomplete_argument) 2973 << Arg->getSourceRange())) 2974 return ExprError(); 2975 TheCall->setArg(i, Arg); 2976 } 2977 } 2978 2979 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2980 if (!Method->isStatic()) 2981 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2982 << Fn->getSourceRange()); 2983 2984 // Check for sentinels 2985 if (NDecl) 2986 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2987 2988 // Do special checking on direct calls to functions. 2989 if (FDecl) { 2990 if (CheckFunctionCall(FDecl, TheCall.get())) 2991 return ExprError(); 2992 2993 if (unsigned BuiltinID = FDecl->getBuiltinID(Context)) 2994 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 2995 } else if (NDecl) { 2996 if (CheckBlockCall(NDecl, TheCall.get())) 2997 return ExprError(); 2998 } 2999 3000 return MaybeBindToTemporary(TheCall.take()); 3001} 3002 3003Action::OwningExprResult 3004Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 3005 SourceLocation RParenLoc, ExprArg InitExpr) { 3006 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 3007 //FIXME: Preserve type source info. 3008 QualType literalType = GetTypeFromParser(Ty); 3009 // FIXME: put back this assert when initializers are worked out. 3010 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 3011 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 3012 3013 if (literalType->isArrayType()) { 3014 if (literalType->isVariableArrayType()) 3015 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 3016 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 3017 } else if (!literalType->isDependentType() && 3018 RequireCompleteType(LParenLoc, literalType, 3019 PDiag(diag::err_typecheck_decl_incomplete_type) 3020 << SourceRange(LParenLoc, 3021 literalExpr->getSourceRange().getEnd()))) 3022 return ExprError(); 3023 3024 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 3025 DeclarationName(), /*FIXME:DirectInit=*/false)) 3026 return ExprError(); 3027 3028 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 3029 if (isFileScope) { // 6.5.2.5p3 3030 if (CheckForConstantInitializer(literalExpr, literalType)) 3031 return ExprError(); 3032 } 3033 InitExpr.release(); 3034 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 3035 literalExpr, isFileScope)); 3036} 3037 3038Action::OwningExprResult 3039Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 3040 SourceLocation RBraceLoc) { 3041 unsigned NumInit = initlist.size(); 3042 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 3043 3044 // Semantic analysis for initializers is done by ActOnDeclarator() and 3045 // CheckInitializer() - it requires knowledge of the object being intialized. 3046 3047 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 3048 RBraceLoc); 3049 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 3050 return Owned(E); 3051} 3052 3053/// CheckCastTypes - Check type constraints for casting between types. 3054bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 3055 CastExpr::CastKind& Kind, 3056 CXXMethodDecl *& ConversionDecl, 3057 bool FunctionalStyle) { 3058 if (getLangOptions().CPlusPlus) 3059 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 3060 ConversionDecl); 3061 3062 DefaultFunctionArrayConversion(castExpr); 3063 3064 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 3065 // type needs to be scalar. 3066 if (castType->isVoidType()) { 3067 // Cast to void allows any expr type. 3068 } else if (!castType->isScalarType() && !castType->isVectorType()) { 3069 if (Context.getCanonicalType(castType).getUnqualifiedType() == 3070 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 3071 (castType->isStructureType() || castType->isUnionType())) { 3072 // GCC struct/union extension: allow cast to self. 3073 // FIXME: Check that the cast destination type is complete. 3074 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3075 << castType << castExpr->getSourceRange(); 3076 Kind = CastExpr::CK_NoOp; 3077 } else if (castType->isUnionType()) { 3078 // GCC cast to union extension 3079 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3080 RecordDecl::field_iterator Field, FieldEnd; 3081 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3082 Field != FieldEnd; ++Field) { 3083 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3084 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3085 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3086 << castExpr->getSourceRange(); 3087 break; 3088 } 3089 } 3090 if (Field == FieldEnd) 3091 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3092 << castExpr->getType() << castExpr->getSourceRange(); 3093 Kind = CastExpr::CK_ToUnion; 3094 } else { 3095 // Reject any other conversions to non-scalar types. 3096 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3097 << castType << castExpr->getSourceRange(); 3098 } 3099 } else if (!castExpr->getType()->isScalarType() && 3100 !castExpr->getType()->isVectorType()) { 3101 return Diag(castExpr->getLocStart(), 3102 diag::err_typecheck_expect_scalar_operand) 3103 << castExpr->getType() << castExpr->getSourceRange(); 3104 } else if (castType->isExtVectorType()) { 3105 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 3106 return true; 3107 } else if (castType->isVectorType()) { 3108 if (CheckVectorCast(TyR, castType, castExpr->getType())) 3109 return true; 3110 } else if (castExpr->getType()->isVectorType()) { 3111 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 3112 return true; 3113 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 3114 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3115 } else if (!castType->isArithmeticType()) { 3116 QualType castExprType = castExpr->getType(); 3117 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3118 return Diag(castExpr->getLocStart(), 3119 diag::err_cast_pointer_from_non_pointer_int) 3120 << castExprType << castExpr->getSourceRange(); 3121 } else if (!castExpr->getType()->isArithmeticType()) { 3122 if (!castType->isIntegralType() && castType->isArithmeticType()) 3123 return Diag(castExpr->getLocStart(), 3124 diag::err_cast_pointer_to_non_pointer_int) 3125 << castType << castExpr->getSourceRange(); 3126 } 3127 if (isa<ObjCSelectorExpr>(castExpr)) 3128 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3129 return false; 3130} 3131 3132bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 3133 assert(VectorTy->isVectorType() && "Not a vector type!"); 3134 3135 if (Ty->isVectorType() || Ty->isIntegerType()) { 3136 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3137 return Diag(R.getBegin(), 3138 Ty->isVectorType() ? 3139 diag::err_invalid_conversion_between_vectors : 3140 diag::err_invalid_conversion_between_vector_and_integer) 3141 << VectorTy << Ty << R; 3142 } else 3143 return Diag(R.getBegin(), 3144 diag::err_invalid_conversion_between_vector_and_scalar) 3145 << VectorTy << Ty << R; 3146 3147 return false; 3148} 3149 3150bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3151 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3152 3153 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3154 // an ExtVectorType. 3155 if (SrcTy->isVectorType()) { 3156 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3157 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3158 << DestTy << SrcTy << R; 3159 return false; 3160 } 3161 3162 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3163 // conversion will take place first from scalar to elt type, and then 3164 // splat from elt type to vector. 3165 if (SrcTy->isPointerType()) 3166 return Diag(R.getBegin(), 3167 diag::err_invalid_conversion_between_vector_and_scalar) 3168 << DestTy << SrcTy << R; 3169 return false; 3170} 3171 3172Action::OwningExprResult 3173Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3174 SourceLocation RParenLoc, ExprArg Op) { 3175 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3176 3177 assert((Ty != 0) && (Op.get() != 0) && 3178 "ActOnCastExpr(): missing type or expr"); 3179 3180 Expr *castExpr = (Expr *)Op.get(); 3181 //FIXME: Preserve type source info. 3182 QualType castType = GetTypeFromParser(Ty); 3183 3184 // If the Expr being casted is a ParenListExpr, handle it specially. 3185 if (isa<ParenListExpr>(castExpr)) 3186 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3187 CXXMethodDecl *Method = 0; 3188 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3189 Kind, Method)) 3190 return ExprError(); 3191 3192 if (Method) { 3193 OwningExprResult CastArg = BuildCXXCastArgument(LParenLoc, castType, Kind, 3194 Method, move(Op)); 3195 3196 if (CastArg.isInvalid()) 3197 return ExprError(); 3198 3199 castExpr = CastArg.takeAs<Expr>(); 3200 } else { 3201 Op.release(); 3202 } 3203 3204 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3205 Kind, castExpr, castType, 3206 LParenLoc, RParenLoc)); 3207} 3208 3209/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3210/// of comma binary operators. 3211Action::OwningExprResult 3212Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3213 Expr *expr = EA.takeAs<Expr>(); 3214 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3215 if (!E) 3216 return Owned(expr); 3217 3218 OwningExprResult Result(*this, E->getExpr(0)); 3219 3220 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3221 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3222 Owned(E->getExpr(i))); 3223 3224 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3225} 3226 3227Action::OwningExprResult 3228Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3229 SourceLocation RParenLoc, ExprArg Op, 3230 QualType Ty) { 3231 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3232 3233 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3234 // then handle it as such. 3235 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3236 if (PE->getNumExprs() == 0) { 3237 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3238 return ExprError(); 3239 } 3240 3241 llvm::SmallVector<Expr *, 8> initExprs; 3242 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3243 initExprs.push_back(PE->getExpr(i)); 3244 3245 // FIXME: This means that pretty-printing the final AST will produce curly 3246 // braces instead of the original commas. 3247 Op.release(); 3248 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3249 initExprs.size(), RParenLoc); 3250 E->setType(Ty); 3251 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3252 Owned(E)); 3253 } else { 3254 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3255 // sequence of BinOp comma operators. 3256 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3257 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3258 } 3259} 3260 3261Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3262 SourceLocation R, 3263 MultiExprArg Val) { 3264 unsigned nexprs = Val.size(); 3265 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3266 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3267 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3268 return Owned(expr); 3269} 3270 3271/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3272/// In that case, lhs = cond. 3273/// C99 6.5.15 3274QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3275 SourceLocation QuestionLoc) { 3276 // C++ is sufficiently different to merit its own checker. 3277 if (getLangOptions().CPlusPlus) 3278 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3279 3280 UsualUnaryConversions(Cond); 3281 UsualUnaryConversions(LHS); 3282 UsualUnaryConversions(RHS); 3283 QualType CondTy = Cond->getType(); 3284 QualType LHSTy = LHS->getType(); 3285 QualType RHSTy = RHS->getType(); 3286 3287 // first, check the condition. 3288 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3289 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3290 << CondTy; 3291 return QualType(); 3292 } 3293 3294 // Now check the two expressions. 3295 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3296 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3297 3298 // If both operands have arithmetic type, do the usual arithmetic conversions 3299 // to find a common type: C99 6.5.15p3,5. 3300 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3301 UsualArithmeticConversions(LHS, RHS); 3302 return LHS->getType(); 3303 } 3304 3305 // If both operands are the same structure or union type, the result is that 3306 // type. 3307 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3308 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3309 if (LHSRT->getDecl() == RHSRT->getDecl()) 3310 // "If both the operands have structure or union type, the result has 3311 // that type." This implies that CV qualifiers are dropped. 3312 return LHSTy.getUnqualifiedType(); 3313 // FIXME: Type of conditional expression must be complete in C mode. 3314 } 3315 3316 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3317 // The following || allows only one side to be void (a GCC-ism). 3318 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3319 if (!LHSTy->isVoidType()) 3320 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3321 << RHS->getSourceRange(); 3322 if (!RHSTy->isVoidType()) 3323 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3324 << LHS->getSourceRange(); 3325 ImpCastExprToType(LHS, Context.VoidTy); 3326 ImpCastExprToType(RHS, Context.VoidTy); 3327 return Context.VoidTy; 3328 } 3329 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3330 // the type of the other operand." 3331 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3332 RHS->isNullPointerConstant(Context)) { 3333 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3334 return LHSTy; 3335 } 3336 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3337 LHS->isNullPointerConstant(Context)) { 3338 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3339 return RHSTy; 3340 } 3341 // Handle things like Class and struct objc_class*. Here we case the result 3342 // to the pseudo-builtin, because that will be implicitly cast back to the 3343 // redefinition type if an attempt is made to access its fields. 3344 if (LHSTy->isObjCClassType() && 3345 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3346 ImpCastExprToType(RHS, LHSTy); 3347 return LHSTy; 3348 } 3349 if (RHSTy->isObjCClassType() && 3350 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3351 ImpCastExprToType(LHS, RHSTy); 3352 return RHSTy; 3353 } 3354 // And the same for struct objc_object* / id 3355 if (LHSTy->isObjCIdType() && 3356 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3357 ImpCastExprToType(RHS, LHSTy); 3358 return LHSTy; 3359 } 3360 if (RHSTy->isObjCIdType() && 3361 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3362 ImpCastExprToType(LHS, RHSTy); 3363 return RHSTy; 3364 } 3365 // Handle block pointer types. 3366 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3367 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3368 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3369 QualType destType = Context.getPointerType(Context.VoidTy); 3370 ImpCastExprToType(LHS, destType); 3371 ImpCastExprToType(RHS, destType); 3372 return destType; 3373 } 3374 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3375 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3376 return QualType(); 3377 } 3378 // We have 2 block pointer types. 3379 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3380 // Two identical block pointer types are always compatible. 3381 return LHSTy; 3382 } 3383 // The block pointer types aren't identical, continue checking. 3384 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3385 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3386 3387 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3388 rhptee.getUnqualifiedType())) { 3389 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3390 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3391 // In this situation, we assume void* type. No especially good 3392 // reason, but this is what gcc does, and we do have to pick 3393 // to get a consistent AST. 3394 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3395 ImpCastExprToType(LHS, incompatTy); 3396 ImpCastExprToType(RHS, incompatTy); 3397 return incompatTy; 3398 } 3399 // The block pointer types are compatible. 3400 ImpCastExprToType(LHS, LHSTy); 3401 ImpCastExprToType(RHS, LHSTy); 3402 return LHSTy; 3403 } 3404 // Check constraints for Objective-C object pointers types. 3405 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3406 3407 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3408 // Two identical object pointer types are always compatible. 3409 return LHSTy; 3410 } 3411 const ObjCObjectPointerType *LHSOPT = LHSTy->getAsObjCObjectPointerType(); 3412 const ObjCObjectPointerType *RHSOPT = RHSTy->getAsObjCObjectPointerType(); 3413 QualType compositeType = LHSTy; 3414 3415 // If both operands are interfaces and either operand can be 3416 // assigned to the other, use that type as the composite 3417 // type. This allows 3418 // xxx ? (A*) a : (B*) b 3419 // where B is a subclass of A. 3420 // 3421 // Additionally, as for assignment, if either type is 'id' 3422 // allow silent coercion. Finally, if the types are 3423 // incompatible then make sure to use 'id' as the composite 3424 // type so the result is acceptable for sending messages to. 3425 3426 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3427 // It could return the composite type. 3428 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3429 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3430 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3431 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3432 } else if ((LHSTy->isObjCQualifiedIdType() || 3433 RHSTy->isObjCQualifiedIdType()) && 3434 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3435 // Need to handle "id<xx>" explicitly. 3436 // GCC allows qualified id and any Objective-C type to devolve to 3437 // id. Currently localizing to here until clear this should be 3438 // part of ObjCQualifiedIdTypesAreCompatible. 3439 compositeType = Context.getObjCIdType(); 3440 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3441 compositeType = Context.getObjCIdType(); 3442 } else { 3443 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3444 << LHSTy << RHSTy 3445 << LHS->getSourceRange() << RHS->getSourceRange(); 3446 QualType incompatTy = Context.getObjCIdType(); 3447 ImpCastExprToType(LHS, incompatTy); 3448 ImpCastExprToType(RHS, incompatTy); 3449 return incompatTy; 3450 } 3451 // The object pointer types are compatible. 3452 ImpCastExprToType(LHS, compositeType); 3453 ImpCastExprToType(RHS, compositeType); 3454 return compositeType; 3455 } 3456 // Check Objective-C object pointer types and 'void *' 3457 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3458 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3459 QualType rhptee = RHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3460 QualType destPointee = lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3461 QualType destType = Context.getPointerType(destPointee); 3462 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3463 ImpCastExprToType(RHS, destType); // promote to void* 3464 return destType; 3465 } 3466 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3467 QualType lhptee = LHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3468 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3469 QualType destPointee = rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3470 QualType destType = Context.getPointerType(destPointee); 3471 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3472 ImpCastExprToType(LHS, destType); // promote to void* 3473 return destType; 3474 } 3475 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3476 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3477 // get the "pointed to" types 3478 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3479 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3480 3481 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3482 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3483 // Figure out necessary qualifiers (C99 6.5.15p6) 3484 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3485 QualType destType = Context.getPointerType(destPointee); 3486 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3487 ImpCastExprToType(RHS, destType); // promote to void* 3488 return destType; 3489 } 3490 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3491 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3492 QualType destType = Context.getPointerType(destPointee); 3493 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3494 ImpCastExprToType(RHS, destType); // promote to void* 3495 return destType; 3496 } 3497 3498 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3499 // Two identical pointer types are always compatible. 3500 return LHSTy; 3501 } 3502 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3503 rhptee.getUnqualifiedType())) { 3504 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3505 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3506 // In this situation, we assume void* type. No especially good 3507 // reason, but this is what gcc does, and we do have to pick 3508 // to get a consistent AST. 3509 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3510 ImpCastExprToType(LHS, incompatTy); 3511 ImpCastExprToType(RHS, incompatTy); 3512 return incompatTy; 3513 } 3514 // The pointer types are compatible. 3515 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3516 // differently qualified versions of compatible types, the result type is 3517 // a pointer to an appropriately qualified version of the *composite* 3518 // type. 3519 // FIXME: Need to calculate the composite type. 3520 // FIXME: Need to add qualifiers 3521 ImpCastExprToType(LHS, LHSTy); 3522 ImpCastExprToType(RHS, LHSTy); 3523 return LHSTy; 3524 } 3525 3526 // GCC compatibility: soften pointer/integer mismatch. 3527 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3528 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3529 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3530 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3531 return RHSTy; 3532 } 3533 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3534 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3535 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3536 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3537 return LHSTy; 3538 } 3539 3540 // Otherwise, the operands are not compatible. 3541 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3542 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3543 return QualType(); 3544} 3545 3546/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3547/// in the case of a the GNU conditional expr extension. 3548Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3549 SourceLocation ColonLoc, 3550 ExprArg Cond, ExprArg LHS, 3551 ExprArg RHS) { 3552 Expr *CondExpr = (Expr *) Cond.get(); 3553 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3554 3555 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3556 // was the condition. 3557 bool isLHSNull = LHSExpr == 0; 3558 if (isLHSNull) 3559 LHSExpr = CondExpr; 3560 3561 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3562 RHSExpr, QuestionLoc); 3563 if (result.isNull()) 3564 return ExprError(); 3565 3566 Cond.release(); 3567 LHS.release(); 3568 RHS.release(); 3569 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3570 isLHSNull ? 0 : LHSExpr, 3571 ColonLoc, RHSExpr, result)); 3572} 3573 3574// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3575// being closely modeled after the C99 spec:-). The odd characteristic of this 3576// routine is it effectively iqnores the qualifiers on the top level pointee. 3577// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3578// FIXME: add a couple examples in this comment. 3579Sema::AssignConvertType 3580Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3581 QualType lhptee, rhptee; 3582 3583 if ((lhsType->isObjCClassType() && 3584 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3585 (rhsType->isObjCClassType() && 3586 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3587 return Compatible; 3588 } 3589 3590 // get the "pointed to" type (ignoring qualifiers at the top level) 3591 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3592 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3593 3594 // make sure we operate on the canonical type 3595 lhptee = Context.getCanonicalType(lhptee); 3596 rhptee = Context.getCanonicalType(rhptee); 3597 3598 AssignConvertType ConvTy = Compatible; 3599 3600 // C99 6.5.16.1p1: This following citation is common to constraints 3601 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3602 // qualifiers of the type *pointed to* by the right; 3603 // FIXME: Handle ExtQualType 3604 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3605 ConvTy = CompatiblePointerDiscardsQualifiers; 3606 3607 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3608 // incomplete type and the other is a pointer to a qualified or unqualified 3609 // version of void... 3610 if (lhptee->isVoidType()) { 3611 if (rhptee->isIncompleteOrObjectType()) 3612 return ConvTy; 3613 3614 // As an extension, we allow cast to/from void* to function pointer. 3615 assert(rhptee->isFunctionType()); 3616 return FunctionVoidPointer; 3617 } 3618 3619 if (rhptee->isVoidType()) { 3620 if (lhptee->isIncompleteOrObjectType()) 3621 return ConvTy; 3622 3623 // As an extension, we allow cast to/from void* to function pointer. 3624 assert(lhptee->isFunctionType()); 3625 return FunctionVoidPointer; 3626 } 3627 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3628 // unqualified versions of compatible types, ... 3629 lhptee = lhptee.getUnqualifiedType(); 3630 rhptee = rhptee.getUnqualifiedType(); 3631 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3632 // Check if the pointee types are compatible ignoring the sign. 3633 // We explicitly check for char so that we catch "char" vs 3634 // "unsigned char" on systems where "char" is unsigned. 3635 if (lhptee->isCharType()) { 3636 lhptee = Context.UnsignedCharTy; 3637 } else if (lhptee->isSignedIntegerType()) { 3638 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3639 } 3640 if (rhptee->isCharType()) { 3641 rhptee = Context.UnsignedCharTy; 3642 } else if (rhptee->isSignedIntegerType()) { 3643 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3644 } 3645 if (lhptee == rhptee) { 3646 // Types are compatible ignoring the sign. Qualifier incompatibility 3647 // takes priority over sign incompatibility because the sign 3648 // warning can be disabled. 3649 if (ConvTy != Compatible) 3650 return ConvTy; 3651 return IncompatiblePointerSign; 3652 } 3653 // General pointer incompatibility takes priority over qualifiers. 3654 return IncompatiblePointer; 3655 } 3656 return ConvTy; 3657} 3658 3659/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3660/// block pointer types are compatible or whether a block and normal pointer 3661/// are compatible. It is more restrict than comparing two function pointer 3662// types. 3663Sema::AssignConvertType 3664Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3665 QualType rhsType) { 3666 QualType lhptee, rhptee; 3667 3668 // get the "pointed to" type (ignoring qualifiers at the top level) 3669 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3670 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3671 3672 // make sure we operate on the canonical type 3673 lhptee = Context.getCanonicalType(lhptee); 3674 rhptee = Context.getCanonicalType(rhptee); 3675 3676 AssignConvertType ConvTy = Compatible; 3677 3678 // For blocks we enforce that qualifiers are identical. 3679 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3680 ConvTy = CompatiblePointerDiscardsQualifiers; 3681 3682 if (!Context.typesAreCompatible(lhptee, rhptee)) 3683 return IncompatibleBlockPointer; 3684 return ConvTy; 3685} 3686 3687/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3688/// has code to accommodate several GCC extensions when type checking 3689/// pointers. Here are some objectionable examples that GCC considers warnings: 3690/// 3691/// int a, *pint; 3692/// short *pshort; 3693/// struct foo *pfoo; 3694/// 3695/// pint = pshort; // warning: assignment from incompatible pointer type 3696/// a = pint; // warning: assignment makes integer from pointer without a cast 3697/// pint = a; // warning: assignment makes pointer from integer without a cast 3698/// pint = pfoo; // warning: assignment from incompatible pointer type 3699/// 3700/// As a result, the code for dealing with pointers is more complex than the 3701/// C99 spec dictates. 3702/// 3703Sema::AssignConvertType 3704Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3705 // Get canonical types. We're not formatting these types, just comparing 3706 // them. 3707 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3708 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3709 3710 if (lhsType == rhsType) 3711 return Compatible; // Common case: fast path an exact match. 3712 3713 if ((lhsType->isObjCClassType() && 3714 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3715 (rhsType->isObjCClassType() && 3716 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3717 return Compatible; 3718 } 3719 3720 // If the left-hand side is a reference type, then we are in a 3721 // (rare!) case where we've allowed the use of references in C, 3722 // e.g., as a parameter type in a built-in function. In this case, 3723 // just make sure that the type referenced is compatible with the 3724 // right-hand side type. The caller is responsible for adjusting 3725 // lhsType so that the resulting expression does not have reference 3726 // type. 3727 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3728 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3729 return Compatible; 3730 return Incompatible; 3731 } 3732 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3733 // to the same ExtVector type. 3734 if (lhsType->isExtVectorType()) { 3735 if (rhsType->isExtVectorType()) 3736 return lhsType == rhsType ? Compatible : Incompatible; 3737 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3738 return Compatible; 3739 } 3740 3741 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3742 // If we are allowing lax vector conversions, and LHS and RHS are both 3743 // vectors, the total size only needs to be the same. This is a bitcast; 3744 // no bits are changed but the result type is different. 3745 if (getLangOptions().LaxVectorConversions && 3746 lhsType->isVectorType() && rhsType->isVectorType()) { 3747 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3748 return IncompatibleVectors; 3749 } 3750 return Incompatible; 3751 } 3752 3753 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3754 return Compatible; 3755 3756 if (isa<PointerType>(lhsType)) { 3757 if (rhsType->isIntegerType()) 3758 return IntToPointer; 3759 3760 if (isa<PointerType>(rhsType)) 3761 return CheckPointerTypesForAssignment(lhsType, rhsType); 3762 3763 // In general, C pointers are not compatible with ObjC object pointers. 3764 if (isa<ObjCObjectPointerType>(rhsType)) { 3765 if (lhsType->isVoidPointerType()) // an exception to the rule. 3766 return Compatible; 3767 return IncompatiblePointer; 3768 } 3769 if (rhsType->getAs<BlockPointerType>()) { 3770 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3771 return Compatible; 3772 3773 // Treat block pointers as objects. 3774 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3775 return Compatible; 3776 } 3777 return Incompatible; 3778 } 3779 3780 if (isa<BlockPointerType>(lhsType)) { 3781 if (rhsType->isIntegerType()) 3782 return IntToBlockPointer; 3783 3784 // Treat block pointers as objects. 3785 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3786 return Compatible; 3787 3788 if (rhsType->isBlockPointerType()) 3789 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3790 3791 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3792 if (RHSPT->getPointeeType()->isVoidType()) 3793 return Compatible; 3794 } 3795 return Incompatible; 3796 } 3797 3798 if (isa<ObjCObjectPointerType>(lhsType)) { 3799 if (rhsType->isIntegerType()) 3800 return IntToPointer; 3801 3802 // In general, C pointers are not compatible with ObjC object pointers. 3803 if (isa<PointerType>(rhsType)) { 3804 if (rhsType->isVoidPointerType()) // an exception to the rule. 3805 return Compatible; 3806 return IncompatiblePointer; 3807 } 3808 if (rhsType->isObjCObjectPointerType()) { 3809 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3810 return Compatible; 3811 if (Context.typesAreCompatible(lhsType, rhsType)) 3812 return Compatible; 3813 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3814 return IncompatibleObjCQualifiedId; 3815 return IncompatiblePointer; 3816 } 3817 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3818 if (RHSPT->getPointeeType()->isVoidType()) 3819 return Compatible; 3820 } 3821 // Treat block pointers as objects. 3822 if (rhsType->isBlockPointerType()) 3823 return Compatible; 3824 return Incompatible; 3825 } 3826 if (isa<PointerType>(rhsType)) { 3827 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3828 if (lhsType == Context.BoolTy) 3829 return Compatible; 3830 3831 if (lhsType->isIntegerType()) 3832 return PointerToInt; 3833 3834 if (isa<PointerType>(lhsType)) 3835 return CheckPointerTypesForAssignment(lhsType, rhsType); 3836 3837 if (isa<BlockPointerType>(lhsType) && 3838 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3839 return Compatible; 3840 return Incompatible; 3841 } 3842 if (isa<ObjCObjectPointerType>(rhsType)) { 3843 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3844 if (lhsType == Context.BoolTy) 3845 return Compatible; 3846 3847 if (lhsType->isIntegerType()) 3848 return PointerToInt; 3849 3850 // In general, C pointers are not compatible with ObjC object pointers. 3851 if (isa<PointerType>(lhsType)) { 3852 if (lhsType->isVoidPointerType()) // an exception to the rule. 3853 return Compatible; 3854 return IncompatiblePointer; 3855 } 3856 if (isa<BlockPointerType>(lhsType) && 3857 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3858 return Compatible; 3859 return Incompatible; 3860 } 3861 3862 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3863 if (Context.typesAreCompatible(lhsType, rhsType)) 3864 return Compatible; 3865 } 3866 return Incompatible; 3867} 3868 3869/// \brief Constructs a transparent union from an expression that is 3870/// used to initialize the transparent union. 3871static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3872 QualType UnionType, FieldDecl *Field) { 3873 // Build an initializer list that designates the appropriate member 3874 // of the transparent union. 3875 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3876 &E, 1, 3877 SourceLocation()); 3878 Initializer->setType(UnionType); 3879 Initializer->setInitializedFieldInUnion(Field); 3880 3881 // Build a compound literal constructing a value of the transparent 3882 // union type from this initializer list. 3883 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3884 false); 3885} 3886 3887Sema::AssignConvertType 3888Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3889 QualType FromType = rExpr->getType(); 3890 3891 // If the ArgType is a Union type, we want to handle a potential 3892 // transparent_union GCC extension. 3893 const RecordType *UT = ArgType->getAsUnionType(); 3894 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3895 return Incompatible; 3896 3897 // The field to initialize within the transparent union. 3898 RecordDecl *UD = UT->getDecl(); 3899 FieldDecl *InitField = 0; 3900 // It's compatible if the expression matches any of the fields. 3901 for (RecordDecl::field_iterator it = UD->field_begin(), 3902 itend = UD->field_end(); 3903 it != itend; ++it) { 3904 if (it->getType()->isPointerType()) { 3905 // If the transparent union contains a pointer type, we allow: 3906 // 1) void pointer 3907 // 2) null pointer constant 3908 if (FromType->isPointerType()) 3909 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 3910 ImpCastExprToType(rExpr, it->getType()); 3911 InitField = *it; 3912 break; 3913 } 3914 3915 if (rExpr->isNullPointerConstant(Context)) { 3916 ImpCastExprToType(rExpr, it->getType()); 3917 InitField = *it; 3918 break; 3919 } 3920 } 3921 3922 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3923 == Compatible) { 3924 InitField = *it; 3925 break; 3926 } 3927 } 3928 3929 if (!InitField) 3930 return Incompatible; 3931 3932 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3933 return Compatible; 3934} 3935 3936Sema::AssignConvertType 3937Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3938 if (getLangOptions().CPlusPlus) { 3939 if (!lhsType->isRecordType()) { 3940 // C++ 5.17p3: If the left operand is not of class type, the 3941 // expression is implicitly converted (C++ 4) to the 3942 // cv-unqualified type of the left operand. 3943 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3944 "assigning")) 3945 return Incompatible; 3946 return Compatible; 3947 } 3948 3949 // FIXME: Currently, we fall through and treat C++ classes like C 3950 // structures. 3951 } 3952 3953 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3954 // a null pointer constant. 3955 if ((lhsType->isPointerType() || 3956 lhsType->isObjCObjectPointerType() || 3957 lhsType->isBlockPointerType()) 3958 && rExpr->isNullPointerConstant(Context)) { 3959 ImpCastExprToType(rExpr, lhsType); 3960 return Compatible; 3961 } 3962 3963 // This check seems unnatural, however it is necessary to ensure the proper 3964 // conversion of functions/arrays. If the conversion were done for all 3965 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3966 // expressions that surpress this implicit conversion (&, sizeof). 3967 // 3968 // Suppress this for references: C++ 8.5.3p5. 3969 if (!lhsType->isReferenceType()) 3970 DefaultFunctionArrayConversion(rExpr); 3971 3972 Sema::AssignConvertType result = 3973 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3974 3975 // C99 6.5.16.1p2: The value of the right operand is converted to the 3976 // type of the assignment expression. 3977 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3978 // so that we can use references in built-in functions even in C. 3979 // The getNonReferenceType() call makes sure that the resulting expression 3980 // does not have reference type. 3981 if (result != Incompatible && rExpr->getType() != lhsType) 3982 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3983 return result; 3984} 3985 3986QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3987 Diag(Loc, diag::err_typecheck_invalid_operands) 3988 << lex->getType() << rex->getType() 3989 << lex->getSourceRange() << rex->getSourceRange(); 3990 return QualType(); 3991} 3992 3993inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3994 Expr *&rex) { 3995 // For conversion purposes, we ignore any qualifiers. 3996 // For example, "const float" and "float" are equivalent. 3997 QualType lhsType = 3998 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3999 QualType rhsType = 4000 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 4001 4002 // If the vector types are identical, return. 4003 if (lhsType == rhsType) 4004 return lhsType; 4005 4006 // Handle the case of a vector & extvector type of the same size and element 4007 // type. It would be nice if we only had one vector type someday. 4008 if (getLangOptions().LaxVectorConversions) { 4009 // FIXME: Should we warn here? 4010 if (const VectorType *LV = lhsType->getAsVectorType()) { 4011 if (const VectorType *RV = rhsType->getAsVectorType()) 4012 if (LV->getElementType() == RV->getElementType() && 4013 LV->getNumElements() == RV->getNumElements()) { 4014 return lhsType->isExtVectorType() ? lhsType : rhsType; 4015 } 4016 } 4017 } 4018 4019 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 4020 // swap back (so that we don't reverse the inputs to a subtract, for instance. 4021 bool swapped = false; 4022 if (rhsType->isExtVectorType()) { 4023 swapped = true; 4024 std::swap(rex, lex); 4025 std::swap(rhsType, lhsType); 4026 } 4027 4028 // Handle the case of an ext vector and scalar. 4029 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 4030 QualType EltTy = LV->getElementType(); 4031 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 4032 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 4033 ImpCastExprToType(rex, lhsType); 4034 if (swapped) std::swap(rex, lex); 4035 return lhsType; 4036 } 4037 } 4038 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 4039 rhsType->isRealFloatingType()) { 4040 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 4041 ImpCastExprToType(rex, lhsType); 4042 if (swapped) std::swap(rex, lex); 4043 return lhsType; 4044 } 4045 } 4046 } 4047 4048 // Vectors of different size or scalar and non-ext-vector are errors. 4049 Diag(Loc, diag::err_typecheck_vector_not_convertable) 4050 << lex->getType() << rex->getType() 4051 << lex->getSourceRange() << rex->getSourceRange(); 4052 return QualType(); 4053} 4054 4055inline QualType Sema::CheckMultiplyDivideOperands( 4056 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4057 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4058 return CheckVectorOperands(Loc, lex, rex); 4059 4060 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4061 4062 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4063 return compType; 4064 return InvalidOperands(Loc, lex, rex); 4065} 4066 4067inline QualType Sema::CheckRemainderOperands( 4068 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4069 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4070 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4071 return CheckVectorOperands(Loc, lex, rex); 4072 return InvalidOperands(Loc, lex, rex); 4073 } 4074 4075 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4076 4077 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4078 return compType; 4079 return InvalidOperands(Loc, lex, rex); 4080} 4081 4082inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4083 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) { 4084 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4085 QualType compType = CheckVectorOperands(Loc, lex, rex); 4086 if (CompLHSTy) *CompLHSTy = compType; 4087 return compType; 4088 } 4089 4090 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4091 4092 // handle the common case first (both operands are arithmetic). 4093 if (lex->getType()->isArithmeticType() && 4094 rex->getType()->isArithmeticType()) { 4095 if (CompLHSTy) *CompLHSTy = compType; 4096 return compType; 4097 } 4098 4099 // Put any potential pointer into PExp 4100 Expr* PExp = lex, *IExp = rex; 4101 if (IExp->getType()->isAnyPointerType()) 4102 std::swap(PExp, IExp); 4103 4104 if (PExp->getType()->isAnyPointerType()) { 4105 4106 if (IExp->getType()->isIntegerType()) { 4107 QualType PointeeTy = PExp->getType()->getPointeeType(); 4108 4109 // Check for arithmetic on pointers to incomplete types. 4110 if (PointeeTy->isVoidType()) { 4111 if (getLangOptions().CPlusPlus) { 4112 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4113 << lex->getSourceRange() << rex->getSourceRange(); 4114 return QualType(); 4115 } 4116 4117 // GNU extension: arithmetic on pointer to void 4118 Diag(Loc, diag::ext_gnu_void_ptr) 4119 << lex->getSourceRange() << rex->getSourceRange(); 4120 } else if (PointeeTy->isFunctionType()) { 4121 if (getLangOptions().CPlusPlus) { 4122 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4123 << lex->getType() << lex->getSourceRange(); 4124 return QualType(); 4125 } 4126 4127 // GNU extension: arithmetic on pointer to function 4128 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4129 << lex->getType() << lex->getSourceRange(); 4130 } else { 4131 // Check if we require a complete type. 4132 if (((PExp->getType()->isPointerType() && 4133 !PExp->getType()->isDependentType()) || 4134 PExp->getType()->isObjCObjectPointerType()) && 4135 RequireCompleteType(Loc, PointeeTy, 4136 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4137 << PExp->getSourceRange() 4138 << PExp->getType())) 4139 return QualType(); 4140 } 4141 // Diagnose bad cases where we step over interface counts. 4142 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4143 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4144 << PointeeTy << PExp->getSourceRange(); 4145 return QualType(); 4146 } 4147 4148 if (CompLHSTy) { 4149 QualType LHSTy = Context.isPromotableBitField(lex); 4150 if (LHSTy.isNull()) { 4151 LHSTy = lex->getType(); 4152 if (LHSTy->isPromotableIntegerType()) 4153 LHSTy = Context.getPromotedIntegerType(LHSTy); 4154 } 4155 *CompLHSTy = LHSTy; 4156 } 4157 return PExp->getType(); 4158 } 4159 } 4160 4161 return InvalidOperands(Loc, lex, rex); 4162} 4163 4164// C99 6.5.6 4165QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4166 SourceLocation Loc, QualType* CompLHSTy) { 4167 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4168 QualType compType = CheckVectorOperands(Loc, lex, rex); 4169 if (CompLHSTy) *CompLHSTy = compType; 4170 return compType; 4171 } 4172 4173 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4174 4175 // Enforce type constraints: C99 6.5.6p3. 4176 4177 // Handle the common case first (both operands are arithmetic). 4178 if (lex->getType()->isArithmeticType() 4179 && rex->getType()->isArithmeticType()) { 4180 if (CompLHSTy) *CompLHSTy = compType; 4181 return compType; 4182 } 4183 4184 // Either ptr - int or ptr - ptr. 4185 if (lex->getType()->isAnyPointerType()) { 4186 QualType lpointee = lex->getType()->getPointeeType(); 4187 4188 // The LHS must be an completely-defined object type. 4189 4190 bool ComplainAboutVoid = false; 4191 Expr *ComplainAboutFunc = 0; 4192 if (lpointee->isVoidType()) { 4193 if (getLangOptions().CPlusPlus) { 4194 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4195 << lex->getSourceRange() << rex->getSourceRange(); 4196 return QualType(); 4197 } 4198 4199 // GNU C extension: arithmetic on pointer to void 4200 ComplainAboutVoid = true; 4201 } else if (lpointee->isFunctionType()) { 4202 if (getLangOptions().CPlusPlus) { 4203 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4204 << lex->getType() << lex->getSourceRange(); 4205 return QualType(); 4206 } 4207 4208 // GNU C extension: arithmetic on pointer to function 4209 ComplainAboutFunc = lex; 4210 } else if (!lpointee->isDependentType() && 4211 RequireCompleteType(Loc, lpointee, 4212 PDiag(diag::err_typecheck_sub_ptr_object) 4213 << lex->getSourceRange() 4214 << lex->getType())) 4215 return QualType(); 4216 4217 // Diagnose bad cases where we step over interface counts. 4218 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4219 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4220 << lpointee << lex->getSourceRange(); 4221 return QualType(); 4222 } 4223 4224 // The result type of a pointer-int computation is the pointer type. 4225 if (rex->getType()->isIntegerType()) { 4226 if (ComplainAboutVoid) 4227 Diag(Loc, diag::ext_gnu_void_ptr) 4228 << lex->getSourceRange() << rex->getSourceRange(); 4229 if (ComplainAboutFunc) 4230 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4231 << ComplainAboutFunc->getType() 4232 << ComplainAboutFunc->getSourceRange(); 4233 4234 if (CompLHSTy) *CompLHSTy = lex->getType(); 4235 return lex->getType(); 4236 } 4237 4238 // Handle pointer-pointer subtractions. 4239 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4240 QualType rpointee = RHSPTy->getPointeeType(); 4241 4242 // RHS must be a completely-type object type. 4243 // Handle the GNU void* extension. 4244 if (rpointee->isVoidType()) { 4245 if (getLangOptions().CPlusPlus) { 4246 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4247 << lex->getSourceRange() << rex->getSourceRange(); 4248 return QualType(); 4249 } 4250 4251 ComplainAboutVoid = true; 4252 } else if (rpointee->isFunctionType()) { 4253 if (getLangOptions().CPlusPlus) { 4254 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4255 << rex->getType() << rex->getSourceRange(); 4256 return QualType(); 4257 } 4258 4259 // GNU extension: arithmetic on pointer to function 4260 if (!ComplainAboutFunc) 4261 ComplainAboutFunc = rex; 4262 } else if (!rpointee->isDependentType() && 4263 RequireCompleteType(Loc, rpointee, 4264 PDiag(diag::err_typecheck_sub_ptr_object) 4265 << rex->getSourceRange() 4266 << rex->getType())) 4267 return QualType(); 4268 4269 if (getLangOptions().CPlusPlus) { 4270 // Pointee types must be the same: C++ [expr.add] 4271 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4272 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4273 << lex->getType() << rex->getType() 4274 << lex->getSourceRange() << rex->getSourceRange(); 4275 return QualType(); 4276 } 4277 } else { 4278 // Pointee types must be compatible C99 6.5.6p3 4279 if (!Context.typesAreCompatible( 4280 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4281 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4282 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4283 << lex->getType() << rex->getType() 4284 << lex->getSourceRange() << rex->getSourceRange(); 4285 return QualType(); 4286 } 4287 } 4288 4289 if (ComplainAboutVoid) 4290 Diag(Loc, diag::ext_gnu_void_ptr) 4291 << lex->getSourceRange() << rex->getSourceRange(); 4292 if (ComplainAboutFunc) 4293 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4294 << ComplainAboutFunc->getType() 4295 << ComplainAboutFunc->getSourceRange(); 4296 4297 if (CompLHSTy) *CompLHSTy = lex->getType(); 4298 return Context.getPointerDiffType(); 4299 } 4300 } 4301 4302 return InvalidOperands(Loc, lex, rex); 4303} 4304 4305// C99 6.5.7 4306QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4307 bool isCompAssign) { 4308 // C99 6.5.7p2: Each of the operands shall have integer type. 4309 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4310 return InvalidOperands(Loc, lex, rex); 4311 4312 // Shifts don't perform usual arithmetic conversions, they just do integer 4313 // promotions on each operand. C99 6.5.7p3 4314 QualType LHSTy = Context.isPromotableBitField(lex); 4315 if (LHSTy.isNull()) { 4316 LHSTy = lex->getType(); 4317 if (LHSTy->isPromotableIntegerType()) 4318 LHSTy = Context.getPromotedIntegerType(LHSTy); 4319 } 4320 if (!isCompAssign) 4321 ImpCastExprToType(lex, LHSTy); 4322 4323 UsualUnaryConversions(rex); 4324 4325 // Sanity-check shift operands 4326 llvm::APSInt Right; 4327 // Check right/shifter operand 4328 if (rex->isIntegerConstantExpr(Right, Context)) { 4329 if (Right.isNegative()) 4330 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4331 else { 4332 llvm::APInt LeftBits(Right.getBitWidth(), 4333 Context.getTypeSize(lex->getType())); 4334 if (Right.uge(LeftBits)) 4335 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4336 } 4337 } 4338 4339 // "The type of the result is that of the promoted left operand." 4340 return LHSTy; 4341} 4342 4343// C99 6.5.8, C++ [expr.rel] 4344QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4345 unsigned OpaqueOpc, bool isRelational) { 4346 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4347 4348 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4349 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4350 4351 // C99 6.5.8p3 / C99 6.5.9p4 4352 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4353 UsualArithmeticConversions(lex, rex); 4354 else { 4355 UsualUnaryConversions(lex); 4356 UsualUnaryConversions(rex); 4357 } 4358 QualType lType = lex->getType(); 4359 QualType rType = rex->getType(); 4360 4361 if (!lType->isFloatingType() 4362 && !(lType->isBlockPointerType() && isRelational)) { 4363 // For non-floating point types, check for self-comparisons of the form 4364 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4365 // often indicate logic errors in the program. 4366 // NOTE: Don't warn about comparisons of enum constants. These can arise 4367 // from macro expansions, and are usually quite deliberate. 4368 Expr *LHSStripped = lex->IgnoreParens(); 4369 Expr *RHSStripped = rex->IgnoreParens(); 4370 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4371 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4372 if (DRL->getDecl() == DRR->getDecl() && 4373 !isa<EnumConstantDecl>(DRL->getDecl())) 4374 Diag(Loc, diag::warn_selfcomparison); 4375 4376 if (isa<CastExpr>(LHSStripped)) 4377 LHSStripped = LHSStripped->IgnoreParenCasts(); 4378 if (isa<CastExpr>(RHSStripped)) 4379 RHSStripped = RHSStripped->IgnoreParenCasts(); 4380 4381 // Warn about comparisons against a string constant (unless the other 4382 // operand is null), the user probably wants strcmp. 4383 Expr *literalString = 0; 4384 Expr *literalStringStripped = 0; 4385 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4386 !RHSStripped->isNullPointerConstant(Context)) { 4387 literalString = lex; 4388 literalStringStripped = LHSStripped; 4389 } else if ((isa<StringLiteral>(RHSStripped) || 4390 isa<ObjCEncodeExpr>(RHSStripped)) && 4391 !LHSStripped->isNullPointerConstant(Context)) { 4392 literalString = rex; 4393 literalStringStripped = RHSStripped; 4394 } 4395 4396 if (literalString) { 4397 std::string resultComparison; 4398 switch (Opc) { 4399 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4400 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4401 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4402 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4403 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4404 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4405 default: assert(false && "Invalid comparison operator"); 4406 } 4407 Diag(Loc, diag::warn_stringcompare) 4408 << isa<ObjCEncodeExpr>(literalStringStripped) 4409 << literalString->getSourceRange() 4410 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4411 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4412 "strcmp(") 4413 << CodeModificationHint::CreateInsertion( 4414 PP.getLocForEndOfToken(rex->getLocEnd()), 4415 resultComparison); 4416 } 4417 } 4418 4419 // The result of comparisons is 'bool' in C++, 'int' in C. 4420 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4421 4422 if (isRelational) { 4423 if (lType->isRealType() && rType->isRealType()) 4424 return ResultTy; 4425 } else { 4426 // Check for comparisons of floating point operands using != and ==. 4427 if (lType->isFloatingType()) { 4428 assert(rType->isFloatingType()); 4429 CheckFloatComparison(Loc,lex,rex); 4430 } 4431 4432 if (lType->isArithmeticType() && rType->isArithmeticType()) 4433 return ResultTy; 4434 } 4435 4436 bool LHSIsNull = lex->isNullPointerConstant(Context); 4437 bool RHSIsNull = rex->isNullPointerConstant(Context); 4438 4439 // All of the following pointer related warnings are GCC extensions, except 4440 // when handling null pointer constants. One day, we can consider making them 4441 // errors (when -pedantic-errors is enabled). 4442 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4443 QualType LCanPointeeTy = 4444 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4445 QualType RCanPointeeTy = 4446 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4447 4448 if (getLangOptions().CPlusPlus) { 4449 if (LCanPointeeTy == RCanPointeeTy) 4450 return ResultTy; 4451 4452 // C++ [expr.rel]p2: 4453 // [...] Pointer conversions (4.10) and qualification 4454 // conversions (4.4) are performed on pointer operands (or on 4455 // a pointer operand and a null pointer constant) to bring 4456 // them to their composite pointer type. [...] 4457 // 4458 // C++ [expr.eq]p1 uses the same notion for (in)equality 4459 // comparisons of pointers. 4460 QualType T = FindCompositePointerType(lex, rex); 4461 if (T.isNull()) { 4462 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4463 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4464 return QualType(); 4465 } 4466 4467 ImpCastExprToType(lex, T); 4468 ImpCastExprToType(rex, T); 4469 return ResultTy; 4470 } 4471 // C99 6.5.9p2 and C99 6.5.8p2 4472 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4473 RCanPointeeTy.getUnqualifiedType())) { 4474 // Valid unless a relational comparison of function pointers 4475 if (isRelational && LCanPointeeTy->isFunctionType()) { 4476 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4477 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4478 } 4479 } else if (!isRelational && 4480 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4481 // Valid unless comparison between non-null pointer and function pointer 4482 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4483 && !LHSIsNull && !RHSIsNull) { 4484 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4485 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4486 } 4487 } else { 4488 // Invalid 4489 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4490 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4491 } 4492 if (LCanPointeeTy != RCanPointeeTy) 4493 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4494 return ResultTy; 4495 } 4496 4497 if (getLangOptions().CPlusPlus) { 4498 // Comparison of pointers with null pointer constants and equality 4499 // comparisons of member pointers to null pointer constants. 4500 if (RHSIsNull && 4501 (lType->isPointerType() || 4502 (!isRelational && lType->isMemberPointerType()))) { 4503 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4504 return ResultTy; 4505 } 4506 if (LHSIsNull && 4507 (rType->isPointerType() || 4508 (!isRelational && rType->isMemberPointerType()))) { 4509 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4510 return ResultTy; 4511 } 4512 4513 // Comparison of member pointers. 4514 if (!isRelational && 4515 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4516 // C++ [expr.eq]p2: 4517 // In addition, pointers to members can be compared, or a pointer to 4518 // member and a null pointer constant. Pointer to member conversions 4519 // (4.11) and qualification conversions (4.4) are performed to bring 4520 // them to a common type. If one operand is a null pointer constant, 4521 // the common type is the type of the other operand. Otherwise, the 4522 // common type is a pointer to member type similar (4.4) to the type 4523 // of one of the operands, with a cv-qualification signature (4.4) 4524 // that is the union of the cv-qualification signatures of the operand 4525 // types. 4526 QualType T = FindCompositePointerType(lex, rex); 4527 if (T.isNull()) { 4528 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4529 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4530 return QualType(); 4531 } 4532 4533 ImpCastExprToType(lex, T); 4534 ImpCastExprToType(rex, T); 4535 return ResultTy; 4536 } 4537 4538 // Comparison of nullptr_t with itself. 4539 if (lType->isNullPtrType() && rType->isNullPtrType()) 4540 return ResultTy; 4541 } 4542 4543 // Handle block pointer types. 4544 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4545 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4546 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4547 4548 if (!LHSIsNull && !RHSIsNull && 4549 !Context.typesAreCompatible(lpointee, rpointee)) { 4550 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4551 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4552 } 4553 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4554 return ResultTy; 4555 } 4556 // Allow block pointers to be compared with null pointer constants. 4557 if (!isRelational 4558 && ((lType->isBlockPointerType() && rType->isPointerType()) 4559 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4560 if (!LHSIsNull && !RHSIsNull) { 4561 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4562 ->getPointeeType()->isVoidType()) 4563 || (lType->isPointerType() && lType->getAs<PointerType>() 4564 ->getPointeeType()->isVoidType()))) 4565 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4566 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4567 } 4568 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4569 return ResultTy; 4570 } 4571 4572 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4573 if (lType->isPointerType() || rType->isPointerType()) { 4574 const PointerType *LPT = lType->getAs<PointerType>(); 4575 const PointerType *RPT = rType->getAs<PointerType>(); 4576 bool LPtrToVoid = LPT ? 4577 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4578 bool RPtrToVoid = RPT ? 4579 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4580 4581 if (!LPtrToVoid && !RPtrToVoid && 4582 !Context.typesAreCompatible(lType, rType)) { 4583 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4584 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4585 } 4586 ImpCastExprToType(rex, lType); 4587 return ResultTy; 4588 } 4589 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4590 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4591 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4592 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4593 ImpCastExprToType(rex, lType); 4594 return ResultTy; 4595 } 4596 } 4597 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4598 unsigned DiagID = 0; 4599 if (RHSIsNull) { 4600 if (isRelational) 4601 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4602 } else if (isRelational) 4603 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4604 else 4605 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4606 4607 if (DiagID) { 4608 Diag(Loc, DiagID) 4609 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4610 } 4611 ImpCastExprToType(rex, lType); // promote the integer to pointer 4612 return ResultTy; 4613 } 4614 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4615 unsigned DiagID = 0; 4616 if (LHSIsNull) { 4617 if (isRelational) 4618 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4619 } else if (isRelational) 4620 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4621 else 4622 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4623 4624 if (DiagID) { 4625 Diag(Loc, DiagID) 4626 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4627 } 4628 ImpCastExprToType(lex, rType); // promote the integer to pointer 4629 return ResultTy; 4630 } 4631 // Handle block pointers. 4632 if (!isRelational && RHSIsNull 4633 && lType->isBlockPointerType() && rType->isIntegerType()) { 4634 ImpCastExprToType(rex, lType); // promote the integer to pointer 4635 return ResultTy; 4636 } 4637 if (!isRelational && LHSIsNull 4638 && lType->isIntegerType() && rType->isBlockPointerType()) { 4639 ImpCastExprToType(lex, rType); // promote the integer to pointer 4640 return ResultTy; 4641 } 4642 return InvalidOperands(Loc, lex, rex); 4643} 4644 4645/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4646/// operates on extended vector types. Instead of producing an IntTy result, 4647/// like a scalar comparison, a vector comparison produces a vector of integer 4648/// types. 4649QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4650 SourceLocation Loc, 4651 bool isRelational) { 4652 // Check to make sure we're operating on vectors of the same type and width, 4653 // Allowing one side to be a scalar of element type. 4654 QualType vType = CheckVectorOperands(Loc, lex, rex); 4655 if (vType.isNull()) 4656 return vType; 4657 4658 QualType lType = lex->getType(); 4659 QualType rType = rex->getType(); 4660 4661 // For non-floating point types, check for self-comparisons of the form 4662 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4663 // often indicate logic errors in the program. 4664 if (!lType->isFloatingType()) { 4665 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4666 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4667 if (DRL->getDecl() == DRR->getDecl()) 4668 Diag(Loc, diag::warn_selfcomparison); 4669 } 4670 4671 // Check for comparisons of floating point operands using != and ==. 4672 if (!isRelational && lType->isFloatingType()) { 4673 assert (rType->isFloatingType()); 4674 CheckFloatComparison(Loc,lex,rex); 4675 } 4676 4677 // Return the type for the comparison, which is the same as vector type for 4678 // integer vectors, or an integer type of identical size and number of 4679 // elements for floating point vectors. 4680 if (lType->isIntegerType()) 4681 return lType; 4682 4683 const VectorType *VTy = lType->getAsVectorType(); 4684 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4685 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4686 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4687 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4688 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4689 4690 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4691 "Unhandled vector element size in vector compare"); 4692 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4693} 4694 4695inline QualType Sema::CheckBitwiseOperands( 4696 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4697 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4698 return CheckVectorOperands(Loc, lex, rex); 4699 4700 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4701 4702 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4703 return compType; 4704 return InvalidOperands(Loc, lex, rex); 4705} 4706 4707inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4708 Expr *&lex, Expr *&rex, SourceLocation Loc) { 4709 UsualUnaryConversions(lex); 4710 UsualUnaryConversions(rex); 4711 4712 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4713 return Context.IntTy; 4714 return InvalidOperands(Loc, lex, rex); 4715} 4716 4717/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4718/// is a read-only property; return true if so. A readonly property expression 4719/// depends on various declarations and thus must be treated specially. 4720/// 4721static bool IsReadonlyProperty(Expr *E, Sema &S) { 4722 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4723 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4724 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4725 QualType BaseType = PropExpr->getBase()->getType(); 4726 if (const ObjCObjectPointerType *OPT = 4727 BaseType->getAsObjCInterfacePointerType()) 4728 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4729 if (S.isPropertyReadonly(PDecl, IFace)) 4730 return true; 4731 } 4732 } 4733 return false; 4734} 4735 4736/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4737/// emit an error and return true. If so, return false. 4738static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4739 SourceLocation OrigLoc = Loc; 4740 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4741 &Loc); 4742 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4743 IsLV = Expr::MLV_ReadonlyProperty; 4744 if (IsLV == Expr::MLV_Valid) 4745 return false; 4746 4747 unsigned Diag = 0; 4748 bool NeedType = false; 4749 switch (IsLV) { // C99 6.5.16p2 4750 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4751 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4752 case Expr::MLV_ArrayType: 4753 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4754 NeedType = true; 4755 break; 4756 case Expr::MLV_NotObjectType: 4757 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4758 NeedType = true; 4759 break; 4760 case Expr::MLV_LValueCast: 4761 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4762 break; 4763 case Expr::MLV_InvalidExpression: 4764 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4765 break; 4766 case Expr::MLV_IncompleteType: 4767 case Expr::MLV_IncompleteVoidType: 4768 return S.RequireCompleteType(Loc, E->getType(), 4769 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4770 << E->getSourceRange()); 4771 case Expr::MLV_DuplicateVectorComponents: 4772 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4773 break; 4774 case Expr::MLV_NotBlockQualified: 4775 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4776 break; 4777 case Expr::MLV_ReadonlyProperty: 4778 Diag = diag::error_readonly_property_assignment; 4779 break; 4780 case Expr::MLV_NoSetterProperty: 4781 Diag = diag::error_nosetter_property_assignment; 4782 break; 4783 } 4784 4785 SourceRange Assign; 4786 if (Loc != OrigLoc) 4787 Assign = SourceRange(OrigLoc, OrigLoc); 4788 if (NeedType) 4789 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4790 else 4791 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4792 return true; 4793} 4794 4795 4796 4797// C99 6.5.16.1 4798QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4799 SourceLocation Loc, 4800 QualType CompoundType) { 4801 // Verify that LHS is a modifiable lvalue, and emit error if not. 4802 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4803 return QualType(); 4804 4805 QualType LHSType = LHS->getType(); 4806 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4807 4808 AssignConvertType ConvTy; 4809 if (CompoundType.isNull()) { 4810 // Simple assignment "x = y". 4811 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4812 // Special case of NSObject attributes on c-style pointer types. 4813 if (ConvTy == IncompatiblePointer && 4814 ((Context.isObjCNSObjectType(LHSType) && 4815 RHSType->isObjCObjectPointerType()) || 4816 (Context.isObjCNSObjectType(RHSType) && 4817 LHSType->isObjCObjectPointerType()))) 4818 ConvTy = Compatible; 4819 4820 // If the RHS is a unary plus or minus, check to see if they = and + are 4821 // right next to each other. If so, the user may have typo'd "x =+ 4" 4822 // instead of "x += 4". 4823 Expr *RHSCheck = RHS; 4824 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4825 RHSCheck = ICE->getSubExpr(); 4826 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4827 if ((UO->getOpcode() == UnaryOperator::Plus || 4828 UO->getOpcode() == UnaryOperator::Minus) && 4829 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4830 // Only if the two operators are exactly adjacent. 4831 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4832 // And there is a space or other character before the subexpr of the 4833 // unary +/-. We don't want to warn on "x=-1". 4834 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4835 UO->getSubExpr()->getLocStart().isFileID()) { 4836 Diag(Loc, diag::warn_not_compound_assign) 4837 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4838 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4839 } 4840 } 4841 } else { 4842 // Compound assignment "x += y" 4843 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4844 } 4845 4846 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4847 RHS, "assigning")) 4848 return QualType(); 4849 4850 // C99 6.5.16p3: The type of an assignment expression is the type of the 4851 // left operand unless the left operand has qualified type, in which case 4852 // it is the unqualified version of the type of the left operand. 4853 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4854 // is converted to the type of the assignment expression (above). 4855 // C++ 5.17p1: the type of the assignment expression is that of its left 4856 // operand. 4857 return LHSType.getUnqualifiedType(); 4858} 4859 4860// C99 6.5.17 4861QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4862 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4863 DefaultFunctionArrayConversion(RHS); 4864 4865 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4866 // incomplete in C++). 4867 4868 return RHS->getType(); 4869} 4870 4871/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4872/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4873QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4874 bool isInc) { 4875 if (Op->isTypeDependent()) 4876 return Context.DependentTy; 4877 4878 QualType ResType = Op->getType(); 4879 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4880 4881 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4882 // Decrement of bool is not allowed. 4883 if (!isInc) { 4884 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4885 return QualType(); 4886 } 4887 // Increment of bool sets it to true, but is deprecated. 4888 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4889 } else if (ResType->isRealType()) { 4890 // OK! 4891 } else if (ResType->isAnyPointerType()) { 4892 QualType PointeeTy = ResType->getPointeeType(); 4893 4894 // C99 6.5.2.4p2, 6.5.6p2 4895 if (PointeeTy->isVoidType()) { 4896 if (getLangOptions().CPlusPlus) { 4897 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4898 << Op->getSourceRange(); 4899 return QualType(); 4900 } 4901 4902 // Pointer to void is a GNU extension in C. 4903 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4904 } else if (PointeeTy->isFunctionType()) { 4905 if (getLangOptions().CPlusPlus) { 4906 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4907 << Op->getType() << Op->getSourceRange(); 4908 return QualType(); 4909 } 4910 4911 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4912 << ResType << Op->getSourceRange(); 4913 } else if (RequireCompleteType(OpLoc, PointeeTy, 4914 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4915 << Op->getSourceRange() 4916 << ResType)) 4917 return QualType(); 4918 // Diagnose bad cases where we step over interface counts. 4919 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4920 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 4921 << PointeeTy << Op->getSourceRange(); 4922 return QualType(); 4923 } 4924 } else if (ResType->isComplexType()) { 4925 // C99 does not support ++/-- on complex types, we allow as an extension. 4926 Diag(OpLoc, diag::ext_integer_increment_complex) 4927 << ResType << Op->getSourceRange(); 4928 } else { 4929 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4930 << ResType << Op->getSourceRange(); 4931 return QualType(); 4932 } 4933 // At this point, we know we have a real, complex or pointer type. 4934 // Now make sure the operand is a modifiable lvalue. 4935 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4936 return QualType(); 4937 return ResType; 4938} 4939 4940/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4941/// This routine allows us to typecheck complex/recursive expressions 4942/// where the declaration is needed for type checking. We only need to 4943/// handle cases when the expression references a function designator 4944/// or is an lvalue. Here are some examples: 4945/// - &(x) => x 4946/// - &*****f => f for f a function designator. 4947/// - &s.xx => s 4948/// - &s.zz[1].yy -> s, if zz is an array 4949/// - *(x + 1) -> x, if x is an array 4950/// - &"123"[2] -> 0 4951/// - & __real__ x -> x 4952static NamedDecl *getPrimaryDecl(Expr *E) { 4953 switch (E->getStmtClass()) { 4954 case Stmt::DeclRefExprClass: 4955 case Stmt::QualifiedDeclRefExprClass: 4956 return cast<DeclRefExpr>(E)->getDecl(); 4957 case Stmt::MemberExprClass: 4958 // If this is an arrow operator, the address is an offset from 4959 // the base's value, so the object the base refers to is 4960 // irrelevant. 4961 if (cast<MemberExpr>(E)->isArrow()) 4962 return 0; 4963 // Otherwise, the expression refers to a part of the base 4964 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4965 case Stmt::ArraySubscriptExprClass: { 4966 // FIXME: This code shouldn't be necessary! We should catch the implicit 4967 // promotion of register arrays earlier. 4968 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4969 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4970 if (ICE->getSubExpr()->getType()->isArrayType()) 4971 return getPrimaryDecl(ICE->getSubExpr()); 4972 } 4973 return 0; 4974 } 4975 case Stmt::UnaryOperatorClass: { 4976 UnaryOperator *UO = cast<UnaryOperator>(E); 4977 4978 switch(UO->getOpcode()) { 4979 case UnaryOperator::Real: 4980 case UnaryOperator::Imag: 4981 case UnaryOperator::Extension: 4982 return getPrimaryDecl(UO->getSubExpr()); 4983 default: 4984 return 0; 4985 } 4986 } 4987 case Stmt::ParenExprClass: 4988 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4989 case Stmt::ImplicitCastExprClass: 4990 // If the result of an implicit cast is an l-value, we care about 4991 // the sub-expression; otherwise, the result here doesn't matter. 4992 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4993 default: 4994 return 0; 4995 } 4996} 4997 4998/// CheckAddressOfOperand - The operand of & must be either a function 4999/// designator or an lvalue designating an object. If it is an lvalue, the 5000/// object cannot be declared with storage class register or be a bit field. 5001/// Note: The usual conversions are *not* applied to the operand of the & 5002/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 5003/// In C++, the operand might be an overloaded function name, in which case 5004/// we allow the '&' but retain the overloaded-function type. 5005QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 5006 // Make sure to ignore parentheses in subsequent checks 5007 op = op->IgnoreParens(); 5008 5009 if (op->isTypeDependent()) 5010 return Context.DependentTy; 5011 5012 if (getLangOptions().C99) { 5013 // Implement C99-only parts of addressof rules. 5014 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 5015 if (uOp->getOpcode() == UnaryOperator::Deref) 5016 // Per C99 6.5.3.2, the address of a deref always returns a valid result 5017 // (assuming the deref expression is valid). 5018 return uOp->getSubExpr()->getType(); 5019 } 5020 // Technically, there should be a check for array subscript 5021 // expressions here, but the result of one is always an lvalue anyway. 5022 } 5023 NamedDecl *dcl = getPrimaryDecl(op); 5024 Expr::isLvalueResult lval = op->isLvalue(Context); 5025 5026 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 5027 // C99 6.5.3.2p1 5028 // The operand must be either an l-value or a function designator 5029 if (!op->getType()->isFunctionType()) { 5030 // FIXME: emit more specific diag... 5031 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 5032 << op->getSourceRange(); 5033 return QualType(); 5034 } 5035 } else if (op->getBitField()) { // C99 6.5.3.2p1 5036 // The operand cannot be a bit-field 5037 Diag(OpLoc, diag::err_typecheck_address_of) 5038 << "bit-field" << op->getSourceRange(); 5039 return QualType(); 5040 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 5041 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 5042 // The operand cannot be an element of a vector 5043 Diag(OpLoc, diag::err_typecheck_address_of) 5044 << "vector element" << op->getSourceRange(); 5045 return QualType(); 5046 } else if (isa<ObjCPropertyRefExpr>(op)) { 5047 // cannot take address of a property expression. 5048 Diag(OpLoc, diag::err_typecheck_address_of) 5049 << "property expression" << op->getSourceRange(); 5050 return QualType(); 5051 } else if (dcl) { // C99 6.5.3.2p1 5052 // We have an lvalue with a decl. Make sure the decl is not declared 5053 // with the register storage-class specifier. 5054 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 5055 if (vd->getStorageClass() == VarDecl::Register) { 5056 Diag(OpLoc, diag::err_typecheck_address_of) 5057 << "register variable" << op->getSourceRange(); 5058 return QualType(); 5059 } 5060 } else if (isa<OverloadedFunctionDecl>(dcl) || 5061 isa<FunctionTemplateDecl>(dcl)) { 5062 return Context.OverloadTy; 5063 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 5064 // Okay: we can take the address of a field. 5065 // Could be a pointer to member, though, if there is an explicit 5066 // scope qualifier for the class. 5067 if (isa<QualifiedDeclRefExpr>(op)) { 5068 DeclContext *Ctx = dcl->getDeclContext(); 5069 if (Ctx && Ctx->isRecord()) { 5070 if (FD->getType()->isReferenceType()) { 5071 Diag(OpLoc, 5072 diag::err_cannot_form_pointer_to_member_of_reference_type) 5073 << FD->getDeclName() << FD->getType(); 5074 return QualType(); 5075 } 5076 5077 return Context.getMemberPointerType(op->getType(), 5078 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5079 } 5080 } 5081 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5082 // Okay: we can take the address of a function. 5083 // As above. 5084 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 5085 return Context.getMemberPointerType(op->getType(), 5086 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5087 } else if (!isa<FunctionDecl>(dcl)) 5088 assert(0 && "Unknown/unexpected decl type"); 5089 } 5090 5091 if (lval == Expr::LV_IncompleteVoidType) { 5092 // Taking the address of a void variable is technically illegal, but we 5093 // allow it in cases which are otherwise valid. 5094 // Example: "extern void x; void* y = &x;". 5095 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5096 } 5097 5098 // If the operand has type "type", the result has type "pointer to type". 5099 return Context.getPointerType(op->getType()); 5100} 5101 5102QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5103 if (Op->isTypeDependent()) 5104 return Context.DependentTy; 5105 5106 UsualUnaryConversions(Op); 5107 QualType Ty = Op->getType(); 5108 5109 // Note that per both C89 and C99, this is always legal, even if ptype is an 5110 // incomplete type or void. It would be possible to warn about dereferencing 5111 // a void pointer, but it's completely well-defined, and such a warning is 5112 // unlikely to catch any mistakes. 5113 if (const PointerType *PT = Ty->getAs<PointerType>()) 5114 return PT->getPointeeType(); 5115 5116 if (const ObjCObjectPointerType *OPT = Ty->getAsObjCObjectPointerType()) 5117 return OPT->getPointeeType(); 5118 5119 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5120 << Ty << Op->getSourceRange(); 5121 return QualType(); 5122} 5123 5124static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5125 tok::TokenKind Kind) { 5126 BinaryOperator::Opcode Opc; 5127 switch (Kind) { 5128 default: assert(0 && "Unknown binop!"); 5129 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5130 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5131 case tok::star: Opc = BinaryOperator::Mul; break; 5132 case tok::slash: Opc = BinaryOperator::Div; break; 5133 case tok::percent: Opc = BinaryOperator::Rem; break; 5134 case tok::plus: Opc = BinaryOperator::Add; break; 5135 case tok::minus: Opc = BinaryOperator::Sub; break; 5136 case tok::lessless: Opc = BinaryOperator::Shl; break; 5137 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5138 case tok::lessequal: Opc = BinaryOperator::LE; break; 5139 case tok::less: Opc = BinaryOperator::LT; break; 5140 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5141 case tok::greater: Opc = BinaryOperator::GT; break; 5142 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5143 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5144 case tok::amp: Opc = BinaryOperator::And; break; 5145 case tok::caret: Opc = BinaryOperator::Xor; break; 5146 case tok::pipe: Opc = BinaryOperator::Or; break; 5147 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5148 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5149 case tok::equal: Opc = BinaryOperator::Assign; break; 5150 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5151 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5152 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5153 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5154 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5155 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5156 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5157 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5158 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5159 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5160 case tok::comma: Opc = BinaryOperator::Comma; break; 5161 } 5162 return Opc; 5163} 5164 5165static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5166 tok::TokenKind Kind) { 5167 UnaryOperator::Opcode Opc; 5168 switch (Kind) { 5169 default: assert(0 && "Unknown unary op!"); 5170 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5171 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5172 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5173 case tok::star: Opc = UnaryOperator::Deref; break; 5174 case tok::plus: Opc = UnaryOperator::Plus; break; 5175 case tok::minus: Opc = UnaryOperator::Minus; break; 5176 case tok::tilde: Opc = UnaryOperator::Not; break; 5177 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5178 case tok::kw___real: Opc = UnaryOperator::Real; break; 5179 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5180 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5181 } 5182 return Opc; 5183} 5184 5185/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5186/// operator @p Opc at location @c TokLoc. This routine only supports 5187/// built-in operations; ActOnBinOp handles overloaded operators. 5188Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5189 unsigned Op, 5190 Expr *lhs, Expr *rhs) { 5191 QualType ResultTy; // Result type of the binary operator. 5192 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5193 // The following two variables are used for compound assignment operators 5194 QualType CompLHSTy; // Type of LHS after promotions for computation 5195 QualType CompResultTy; // Type of computation result 5196 5197 switch (Opc) { 5198 case BinaryOperator::Assign: 5199 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5200 break; 5201 case BinaryOperator::PtrMemD: 5202 case BinaryOperator::PtrMemI: 5203 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5204 Opc == BinaryOperator::PtrMemI); 5205 break; 5206 case BinaryOperator::Mul: 5207 case BinaryOperator::Div: 5208 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5209 break; 5210 case BinaryOperator::Rem: 5211 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5212 break; 5213 case BinaryOperator::Add: 5214 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5215 break; 5216 case BinaryOperator::Sub: 5217 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5218 break; 5219 case BinaryOperator::Shl: 5220 case BinaryOperator::Shr: 5221 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5222 break; 5223 case BinaryOperator::LE: 5224 case BinaryOperator::LT: 5225 case BinaryOperator::GE: 5226 case BinaryOperator::GT: 5227 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5228 break; 5229 case BinaryOperator::EQ: 5230 case BinaryOperator::NE: 5231 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5232 break; 5233 case BinaryOperator::And: 5234 case BinaryOperator::Xor: 5235 case BinaryOperator::Or: 5236 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5237 break; 5238 case BinaryOperator::LAnd: 5239 case BinaryOperator::LOr: 5240 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5241 break; 5242 case BinaryOperator::MulAssign: 5243 case BinaryOperator::DivAssign: 5244 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5245 CompLHSTy = CompResultTy; 5246 if (!CompResultTy.isNull()) 5247 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5248 break; 5249 case BinaryOperator::RemAssign: 5250 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5251 CompLHSTy = CompResultTy; 5252 if (!CompResultTy.isNull()) 5253 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5254 break; 5255 case BinaryOperator::AddAssign: 5256 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5257 if (!CompResultTy.isNull()) 5258 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5259 break; 5260 case BinaryOperator::SubAssign: 5261 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5262 if (!CompResultTy.isNull()) 5263 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5264 break; 5265 case BinaryOperator::ShlAssign: 5266 case BinaryOperator::ShrAssign: 5267 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5268 CompLHSTy = CompResultTy; 5269 if (!CompResultTy.isNull()) 5270 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5271 break; 5272 case BinaryOperator::AndAssign: 5273 case BinaryOperator::XorAssign: 5274 case BinaryOperator::OrAssign: 5275 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5276 CompLHSTy = CompResultTy; 5277 if (!CompResultTy.isNull()) 5278 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5279 break; 5280 case BinaryOperator::Comma: 5281 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5282 break; 5283 } 5284 if (ResultTy.isNull()) 5285 return ExprError(); 5286 if (CompResultTy.isNull()) 5287 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5288 else 5289 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5290 CompLHSTy, CompResultTy, 5291 OpLoc)); 5292} 5293 5294// Binary Operators. 'Tok' is the token for the operator. 5295Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5296 tok::TokenKind Kind, 5297 ExprArg LHS, ExprArg RHS) { 5298 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5299 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5300 5301 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5302 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5303 5304 if (getLangOptions().CPlusPlus && 5305 (lhs->getType()->isOverloadableType() || 5306 rhs->getType()->isOverloadableType())) { 5307 // Find all of the overloaded operators visible from this 5308 // point. We perform both an operator-name lookup from the local 5309 // scope and an argument-dependent lookup based on the types of 5310 // the arguments. 5311 FunctionSet Functions; 5312 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5313 if (OverOp != OO_None) { 5314 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5315 Functions); 5316 Expr *Args[2] = { lhs, rhs }; 5317 DeclarationName OpName 5318 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5319 ArgumentDependentLookup(OpName, Args, 2, Functions); 5320 } 5321 5322 // Build the (potentially-overloaded, potentially-dependent) 5323 // binary operation. 5324 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5325 } 5326 5327 // Build a built-in binary operation. 5328 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5329} 5330 5331Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5332 unsigned OpcIn, 5333 ExprArg InputArg) { 5334 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5335 5336 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5337 Expr *Input = (Expr *)InputArg.get(); 5338 QualType resultType; 5339 switch (Opc) { 5340 case UnaryOperator::OffsetOf: 5341 assert(false && "Invalid unary operator"); 5342 break; 5343 5344 case UnaryOperator::PreInc: 5345 case UnaryOperator::PreDec: 5346 case UnaryOperator::PostInc: 5347 case UnaryOperator::PostDec: 5348 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5349 Opc == UnaryOperator::PreInc || 5350 Opc == UnaryOperator::PostInc); 5351 break; 5352 case UnaryOperator::AddrOf: 5353 resultType = CheckAddressOfOperand(Input, OpLoc); 5354 break; 5355 case UnaryOperator::Deref: 5356 DefaultFunctionArrayConversion(Input); 5357 resultType = CheckIndirectionOperand(Input, OpLoc); 5358 break; 5359 case UnaryOperator::Plus: 5360 case UnaryOperator::Minus: 5361 UsualUnaryConversions(Input); 5362 resultType = Input->getType(); 5363 if (resultType->isDependentType()) 5364 break; 5365 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5366 break; 5367 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5368 resultType->isEnumeralType()) 5369 break; 5370 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5371 Opc == UnaryOperator::Plus && 5372 resultType->isPointerType()) 5373 break; 5374 5375 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5376 << resultType << Input->getSourceRange()); 5377 case UnaryOperator::Not: // bitwise complement 5378 UsualUnaryConversions(Input); 5379 resultType = Input->getType(); 5380 if (resultType->isDependentType()) 5381 break; 5382 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5383 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5384 // C99 does not support '~' for complex conjugation. 5385 Diag(OpLoc, diag::ext_integer_complement_complex) 5386 << resultType << Input->getSourceRange(); 5387 else if (!resultType->isIntegerType()) 5388 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5389 << resultType << Input->getSourceRange()); 5390 break; 5391 case UnaryOperator::LNot: // logical negation 5392 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5393 DefaultFunctionArrayConversion(Input); 5394 resultType = Input->getType(); 5395 if (resultType->isDependentType()) 5396 break; 5397 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5398 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5399 << resultType << Input->getSourceRange()); 5400 // LNot always has type int. C99 6.5.3.3p5. 5401 // In C++, it's bool. C++ 5.3.1p8 5402 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5403 break; 5404 case UnaryOperator::Real: 5405 case UnaryOperator::Imag: 5406 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5407 break; 5408 case UnaryOperator::Extension: 5409 resultType = Input->getType(); 5410 break; 5411 } 5412 if (resultType.isNull()) 5413 return ExprError(); 5414 5415 InputArg.release(); 5416 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5417} 5418 5419// Unary Operators. 'Tok' is the token for the operator. 5420Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5421 tok::TokenKind Op, ExprArg input) { 5422 Expr *Input = (Expr*)input.get(); 5423 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5424 5425 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5426 // Find all of the overloaded operators visible from this 5427 // point. We perform both an operator-name lookup from the local 5428 // scope and an argument-dependent lookup based on the types of 5429 // the arguments. 5430 FunctionSet Functions; 5431 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5432 if (OverOp != OO_None) { 5433 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5434 Functions); 5435 DeclarationName OpName 5436 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5437 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5438 } 5439 5440 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5441 } 5442 5443 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5444} 5445 5446/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5447Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5448 SourceLocation LabLoc, 5449 IdentifierInfo *LabelII) { 5450 // Look up the record for this label identifier. 5451 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5452 5453 // If we haven't seen this label yet, create a forward reference. It 5454 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5455 if (LabelDecl == 0) 5456 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5457 5458 // Create the AST node. The address of a label always has type 'void*'. 5459 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5460 Context.getPointerType(Context.VoidTy))); 5461} 5462 5463Sema::OwningExprResult 5464Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5465 SourceLocation RPLoc) { // "({..})" 5466 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5467 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5468 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5469 5470 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5471 if (isFileScope) 5472 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5473 5474 // FIXME: there are a variety of strange constraints to enforce here, for 5475 // example, it is not possible to goto into a stmt expression apparently. 5476 // More semantic analysis is needed. 5477 5478 // If there are sub stmts in the compound stmt, take the type of the last one 5479 // as the type of the stmtexpr. 5480 QualType Ty = Context.VoidTy; 5481 5482 if (!Compound->body_empty()) { 5483 Stmt *LastStmt = Compound->body_back(); 5484 // If LastStmt is a label, skip down through into the body. 5485 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5486 LastStmt = Label->getSubStmt(); 5487 5488 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5489 Ty = LastExpr->getType(); 5490 } 5491 5492 // FIXME: Check that expression type is complete/non-abstract; statement 5493 // expressions are not lvalues. 5494 5495 substmt.release(); 5496 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5497} 5498 5499Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5500 SourceLocation BuiltinLoc, 5501 SourceLocation TypeLoc, 5502 TypeTy *argty, 5503 OffsetOfComponent *CompPtr, 5504 unsigned NumComponents, 5505 SourceLocation RPLoc) { 5506 // FIXME: This function leaks all expressions in the offset components on 5507 // error. 5508 // FIXME: Preserve type source info. 5509 QualType ArgTy = GetTypeFromParser(argty); 5510 assert(!ArgTy.isNull() && "Missing type argument!"); 5511 5512 bool Dependent = ArgTy->isDependentType(); 5513 5514 // We must have at least one component that refers to the type, and the first 5515 // one is known to be a field designator. Verify that the ArgTy represents 5516 // a struct/union/class. 5517 if (!Dependent && !ArgTy->isRecordType()) 5518 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5519 5520 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5521 // with an incomplete type would be illegal. 5522 5523 // Otherwise, create a null pointer as the base, and iteratively process 5524 // the offsetof designators. 5525 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5526 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5527 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5528 ArgTy, SourceLocation()); 5529 5530 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5531 // GCC extension, diagnose them. 5532 // FIXME: This diagnostic isn't actually visible because the location is in 5533 // a system header! 5534 if (NumComponents != 1) 5535 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5536 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5537 5538 if (!Dependent) { 5539 bool DidWarnAboutNonPOD = false; 5540 5541 // FIXME: Dependent case loses a lot of information here. And probably 5542 // leaks like a sieve. 5543 for (unsigned i = 0; i != NumComponents; ++i) { 5544 const OffsetOfComponent &OC = CompPtr[i]; 5545 if (OC.isBrackets) { 5546 // Offset of an array sub-field. TODO: Should we allow vector elements? 5547 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5548 if (!AT) { 5549 Res->Destroy(Context); 5550 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5551 << Res->getType()); 5552 } 5553 5554 // FIXME: C++: Verify that operator[] isn't overloaded. 5555 5556 // Promote the array so it looks more like a normal array subscript 5557 // expression. 5558 DefaultFunctionArrayConversion(Res); 5559 5560 // C99 6.5.2.1p1 5561 Expr *Idx = static_cast<Expr*>(OC.U.E); 5562 // FIXME: Leaks Res 5563 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5564 return ExprError(Diag(Idx->getLocStart(), 5565 diag::err_typecheck_subscript_not_integer) 5566 << Idx->getSourceRange()); 5567 5568 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5569 OC.LocEnd); 5570 continue; 5571 } 5572 5573 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5574 if (!RC) { 5575 Res->Destroy(Context); 5576 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5577 << Res->getType()); 5578 } 5579 5580 // Get the decl corresponding to this. 5581 RecordDecl *RD = RC->getDecl(); 5582 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5583 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5584 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5585 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5586 << Res->getType()); 5587 DidWarnAboutNonPOD = true; 5588 } 5589 } 5590 5591 FieldDecl *MemberDecl 5592 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5593 LookupMemberName) 5594 .getAsDecl()); 5595 // FIXME: Leaks Res 5596 if (!MemberDecl) 5597 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member_deprecated) 5598 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5599 5600 // FIXME: C++: Verify that MemberDecl isn't a static field. 5601 // FIXME: Verify that MemberDecl isn't a bitfield. 5602 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5603 Res = BuildAnonymousStructUnionMemberReference( 5604 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5605 } else { 5606 // MemberDecl->getType() doesn't get the right qualifiers, but it 5607 // doesn't matter here. 5608 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5609 MemberDecl->getType().getNonReferenceType()); 5610 } 5611 } 5612 } 5613 5614 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5615 Context.getSizeType(), BuiltinLoc)); 5616} 5617 5618 5619Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5620 TypeTy *arg1,TypeTy *arg2, 5621 SourceLocation RPLoc) { 5622 // FIXME: Preserve type source info. 5623 QualType argT1 = GetTypeFromParser(arg1); 5624 QualType argT2 = GetTypeFromParser(arg2); 5625 5626 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5627 5628 if (getLangOptions().CPlusPlus) { 5629 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5630 << SourceRange(BuiltinLoc, RPLoc); 5631 return ExprError(); 5632 } 5633 5634 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5635 argT1, argT2, RPLoc)); 5636} 5637 5638Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5639 ExprArg cond, 5640 ExprArg expr1, ExprArg expr2, 5641 SourceLocation RPLoc) { 5642 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5643 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5644 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5645 5646 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5647 5648 QualType resType; 5649 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5650 resType = Context.DependentTy; 5651 } else { 5652 // The conditional expression is required to be a constant expression. 5653 llvm::APSInt condEval(32); 5654 SourceLocation ExpLoc; 5655 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5656 return ExprError(Diag(ExpLoc, 5657 diag::err_typecheck_choose_expr_requires_constant) 5658 << CondExpr->getSourceRange()); 5659 5660 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5661 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5662 } 5663 5664 cond.release(); expr1.release(); expr2.release(); 5665 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5666 resType, RPLoc)); 5667} 5668 5669//===----------------------------------------------------------------------===// 5670// Clang Extensions. 5671//===----------------------------------------------------------------------===// 5672 5673/// ActOnBlockStart - This callback is invoked when a block literal is started. 5674void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5675 // Analyze block parameters. 5676 BlockSemaInfo *BSI = new BlockSemaInfo(); 5677 5678 // Add BSI to CurBlock. 5679 BSI->PrevBlockInfo = CurBlock; 5680 CurBlock = BSI; 5681 5682 BSI->ReturnType = QualType(); 5683 BSI->TheScope = BlockScope; 5684 BSI->hasBlockDeclRefExprs = false; 5685 BSI->hasPrototype = false; 5686 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5687 CurFunctionNeedsScopeChecking = false; 5688 5689 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5690 PushDeclContext(BlockScope, BSI->TheDecl); 5691} 5692 5693void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5694 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5695 5696 if (ParamInfo.getNumTypeObjects() == 0 5697 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5698 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5699 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5700 5701 if (T->isArrayType()) { 5702 Diag(ParamInfo.getSourceRange().getBegin(), 5703 diag::err_block_returns_array); 5704 return; 5705 } 5706 5707 // The parameter list is optional, if there was none, assume (). 5708 if (!T->isFunctionType()) 5709 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5710 5711 CurBlock->hasPrototype = true; 5712 CurBlock->isVariadic = false; 5713 // Check for a valid sentinel attribute on this block. 5714 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5715 Diag(ParamInfo.getAttributes()->getLoc(), 5716 diag::warn_attribute_sentinel_not_variadic) << 1; 5717 // FIXME: remove the attribute. 5718 } 5719 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5720 5721 // Do not allow returning a objc interface by-value. 5722 if (RetTy->isObjCInterfaceType()) { 5723 Diag(ParamInfo.getSourceRange().getBegin(), 5724 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5725 return; 5726 } 5727 return; 5728 } 5729 5730 // Analyze arguments to block. 5731 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5732 "Not a function declarator!"); 5733 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5734 5735 CurBlock->hasPrototype = FTI.hasPrototype; 5736 CurBlock->isVariadic = true; 5737 5738 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5739 // no arguments, not a function that takes a single void argument. 5740 if (FTI.hasPrototype && 5741 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5742 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5743 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5744 // empty arg list, don't push any params. 5745 CurBlock->isVariadic = false; 5746 } else if (FTI.hasPrototype) { 5747 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5748 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5749 CurBlock->isVariadic = FTI.isVariadic; 5750 } 5751 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5752 CurBlock->Params.size()); 5753 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5754 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5755 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5756 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5757 // If this has an identifier, add it to the scope stack. 5758 if ((*AI)->getIdentifier()) 5759 PushOnScopeChains(*AI, CurBlock->TheScope); 5760 5761 // Check for a valid sentinel attribute on this block. 5762 if (!CurBlock->isVariadic && 5763 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5764 Diag(ParamInfo.getAttributes()->getLoc(), 5765 diag::warn_attribute_sentinel_not_variadic) << 1; 5766 // FIXME: remove the attribute. 5767 } 5768 5769 // Analyze the return type. 5770 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5771 QualType RetTy = T->getAsFunctionType()->getResultType(); 5772 5773 // Do not allow returning a objc interface by-value. 5774 if (RetTy->isObjCInterfaceType()) { 5775 Diag(ParamInfo.getSourceRange().getBegin(), 5776 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5777 } else if (!RetTy->isDependentType()) 5778 CurBlock->ReturnType = RetTy; 5779} 5780 5781/// ActOnBlockError - If there is an error parsing a block, this callback 5782/// is invoked to pop the information about the block from the action impl. 5783void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5784 // Ensure that CurBlock is deleted. 5785 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5786 5787 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5788 5789 // Pop off CurBlock, handle nested blocks. 5790 PopDeclContext(); 5791 CurBlock = CurBlock->PrevBlockInfo; 5792 // FIXME: Delete the ParmVarDecl objects as well??? 5793} 5794 5795/// ActOnBlockStmtExpr - This is called when the body of a block statement 5796/// literal was successfully completed. ^(int x){...} 5797Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5798 StmtArg body, Scope *CurScope) { 5799 // If blocks are disabled, emit an error. 5800 if (!LangOpts.Blocks) 5801 Diag(CaretLoc, diag::err_blocks_disable); 5802 5803 // Ensure that CurBlock is deleted. 5804 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5805 5806 PopDeclContext(); 5807 5808 // Pop off CurBlock, handle nested blocks. 5809 CurBlock = CurBlock->PrevBlockInfo; 5810 5811 QualType RetTy = Context.VoidTy; 5812 if (!BSI->ReturnType.isNull()) 5813 RetTy = BSI->ReturnType; 5814 5815 llvm::SmallVector<QualType, 8> ArgTypes; 5816 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5817 ArgTypes.push_back(BSI->Params[i]->getType()); 5818 5819 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5820 QualType BlockTy; 5821 if (!BSI->hasPrototype) 5822 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5823 NoReturn); 5824 else 5825 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5826 BSI->isVariadic, 0, false, false, 0, 0, 5827 NoReturn); 5828 5829 // FIXME: Check that return/parameter types are complete/non-abstract 5830 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5831 BlockTy = Context.getBlockPointerType(BlockTy); 5832 5833 // If needed, diagnose invalid gotos and switches in the block. 5834 if (CurFunctionNeedsScopeChecking) 5835 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5836 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5837 5838 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5839 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5840 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5841 BSI->hasBlockDeclRefExprs)); 5842} 5843 5844Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5845 ExprArg expr, TypeTy *type, 5846 SourceLocation RPLoc) { 5847 QualType T = GetTypeFromParser(type); 5848 Expr *E = static_cast<Expr*>(expr.get()); 5849 Expr *OrigExpr = E; 5850 5851 InitBuiltinVaListType(); 5852 5853 // Get the va_list type 5854 QualType VaListType = Context.getBuiltinVaListType(); 5855 if (VaListType->isArrayType()) { 5856 // Deal with implicit array decay; for example, on x86-64, 5857 // va_list is an array, but it's supposed to decay to 5858 // a pointer for va_arg. 5859 VaListType = Context.getArrayDecayedType(VaListType); 5860 // Make sure the input expression also decays appropriately. 5861 UsualUnaryConversions(E); 5862 } else { 5863 // Otherwise, the va_list argument must be an l-value because 5864 // it is modified by va_arg. 5865 if (!E->isTypeDependent() && 5866 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5867 return ExprError(); 5868 } 5869 5870 if (!E->isTypeDependent() && 5871 !Context.hasSameType(VaListType, E->getType())) { 5872 return ExprError(Diag(E->getLocStart(), 5873 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5874 << OrigExpr->getType() << E->getSourceRange()); 5875 } 5876 5877 // FIXME: Check that type is complete/non-abstract 5878 // FIXME: Warn if a non-POD type is passed in. 5879 5880 expr.release(); 5881 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5882 RPLoc)); 5883} 5884 5885Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5886 // The type of __null will be int or long, depending on the size of 5887 // pointers on the target. 5888 QualType Ty; 5889 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5890 Ty = Context.IntTy; 5891 else 5892 Ty = Context.LongTy; 5893 5894 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5895} 5896 5897bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5898 SourceLocation Loc, 5899 QualType DstType, QualType SrcType, 5900 Expr *SrcExpr, const char *Flavor) { 5901 // Decode the result (notice that AST's are still created for extensions). 5902 bool isInvalid = false; 5903 unsigned DiagKind; 5904 switch (ConvTy) { 5905 default: assert(0 && "Unknown conversion type"); 5906 case Compatible: return false; 5907 case PointerToInt: 5908 DiagKind = diag::ext_typecheck_convert_pointer_int; 5909 break; 5910 case IntToPointer: 5911 DiagKind = diag::ext_typecheck_convert_int_pointer; 5912 break; 5913 case IncompatiblePointer: 5914 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5915 break; 5916 case IncompatiblePointerSign: 5917 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5918 break; 5919 case FunctionVoidPointer: 5920 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5921 break; 5922 case CompatiblePointerDiscardsQualifiers: 5923 // If the qualifiers lost were because we were applying the 5924 // (deprecated) C++ conversion from a string literal to a char* 5925 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5926 // Ideally, this check would be performed in 5927 // CheckPointerTypesForAssignment. However, that would require a 5928 // bit of refactoring (so that the second argument is an 5929 // expression, rather than a type), which should be done as part 5930 // of a larger effort to fix CheckPointerTypesForAssignment for 5931 // C++ semantics. 5932 if (getLangOptions().CPlusPlus && 5933 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5934 return false; 5935 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5936 break; 5937 case IntToBlockPointer: 5938 DiagKind = diag::err_int_to_block_pointer; 5939 break; 5940 case IncompatibleBlockPointer: 5941 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5942 break; 5943 case IncompatibleObjCQualifiedId: 5944 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5945 // it can give a more specific diagnostic. 5946 DiagKind = diag::warn_incompatible_qualified_id; 5947 break; 5948 case IncompatibleVectors: 5949 DiagKind = diag::warn_incompatible_vectors; 5950 break; 5951 case Incompatible: 5952 DiagKind = diag::err_typecheck_convert_incompatible; 5953 isInvalid = true; 5954 break; 5955 } 5956 5957 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5958 << SrcExpr->getSourceRange(); 5959 return isInvalid; 5960} 5961 5962bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5963 llvm::APSInt ICEResult; 5964 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5965 if (Result) 5966 *Result = ICEResult; 5967 return false; 5968 } 5969 5970 Expr::EvalResult EvalResult; 5971 5972 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5973 EvalResult.HasSideEffects) { 5974 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5975 5976 if (EvalResult.Diag) { 5977 // We only show the note if it's not the usual "invalid subexpression" 5978 // or if it's actually in a subexpression. 5979 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5980 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5981 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5982 } 5983 5984 return true; 5985 } 5986 5987 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5988 E->getSourceRange(); 5989 5990 if (EvalResult.Diag && 5991 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5992 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5993 5994 if (Result) 5995 *Result = EvalResult.Val.getInt(); 5996 return false; 5997} 5998 5999Sema::ExpressionEvaluationContext 6000Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 6001 // Introduce a new set of potentially referenced declarations to the stack. 6002 if (NewContext == PotentiallyPotentiallyEvaluated) 6003 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 6004 6005 std::swap(ExprEvalContext, NewContext); 6006 return NewContext; 6007} 6008 6009void 6010Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 6011 ExpressionEvaluationContext NewContext) { 6012 ExprEvalContext = NewContext; 6013 6014 if (OldContext == PotentiallyPotentiallyEvaluated) { 6015 // Mark any remaining declarations in the current position of the stack 6016 // as "referenced". If they were not meant to be referenced, semantic 6017 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 6018 PotentiallyReferencedDecls RemainingDecls; 6019 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 6020 PotentiallyReferencedDeclStack.pop_back(); 6021 6022 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 6023 IEnd = RemainingDecls.end(); 6024 I != IEnd; ++I) 6025 MarkDeclarationReferenced(I->first, I->second); 6026 } 6027} 6028 6029/// \brief Note that the given declaration was referenced in the source code. 6030/// 6031/// This routine should be invoke whenever a given declaration is referenced 6032/// in the source code, and where that reference occurred. If this declaration 6033/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 6034/// C99 6.9p3), then the declaration will be marked as used. 6035/// 6036/// \param Loc the location where the declaration was referenced. 6037/// 6038/// \param D the declaration that has been referenced by the source code. 6039void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 6040 assert(D && "No declaration?"); 6041 6042 if (D->isUsed()) 6043 return; 6044 6045 // Mark a parameter declaration "used", regardless of whether we're in a 6046 // template or not. 6047 if (isa<ParmVarDecl>(D)) 6048 D->setUsed(true); 6049 6050 // Do not mark anything as "used" within a dependent context; wait for 6051 // an instantiation. 6052 if (CurContext->isDependentContext()) 6053 return; 6054 6055 switch (ExprEvalContext) { 6056 case Unevaluated: 6057 // We are in an expression that is not potentially evaluated; do nothing. 6058 return; 6059 6060 case PotentiallyEvaluated: 6061 // We are in a potentially-evaluated expression, so this declaration is 6062 // "used"; handle this below. 6063 break; 6064 6065 case PotentiallyPotentiallyEvaluated: 6066 // We are in an expression that may be potentially evaluated; queue this 6067 // declaration reference until we know whether the expression is 6068 // potentially evaluated. 6069 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6070 return; 6071 } 6072 6073 // Note that this declaration has been used. 6074 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6075 unsigned TypeQuals; 6076 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6077 if (!Constructor->isUsed()) 6078 DefineImplicitDefaultConstructor(Loc, Constructor); 6079 } else if (Constructor->isImplicit() && 6080 Constructor->isCopyConstructor(Context, TypeQuals)) { 6081 if (!Constructor->isUsed()) 6082 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6083 } 6084 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6085 if (Destructor->isImplicit() && !Destructor->isUsed()) 6086 DefineImplicitDestructor(Loc, Destructor); 6087 6088 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6089 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6090 MethodDecl->getOverloadedOperator() == OO_Equal) { 6091 if (!MethodDecl->isUsed()) 6092 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6093 } 6094 } 6095 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6096 // Implicit instantiation of function templates and member functions of 6097 // class templates. 6098 if (!Function->getBody()) { 6099 // FIXME: distinguish between implicit instantiations of function 6100 // templates and explicit specializations (the latter don't get 6101 // instantiated, naturally). 6102 if (Function->getInstantiatedFromMemberFunction() || 6103 Function->getPrimaryTemplate()) 6104 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6105 } 6106 6107 6108 // FIXME: keep track of references to static functions 6109 Function->setUsed(true); 6110 return; 6111 } 6112 6113 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6114 // Implicit instantiation of static data members of class templates. 6115 // FIXME: distinguish between implicit instantiations (which we need to 6116 // actually instantiate) and explicit specializations. 6117 if (Var->isStaticDataMember() && 6118 Var->getInstantiatedFromStaticDataMember()) 6119 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6120 6121 // FIXME: keep track of references to static data? 6122 6123 D->setUsed(true); 6124 return; 6125 } 6126} 6127 6128