SemaExpr.cpp revision c0d600c83a91b200616616f3982553c0ff42fcf3
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/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(Context, 62 MD->getSelector(), 63 MD->isInstanceMethod()); 64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 65 } 66 } 67 } 68 69 if (!isSilenced) 70 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 71 } 72 73 // See if this is a deleted function. 74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 75 if (FD->isDeleted()) { 76 Diag(Loc, diag::err_deleted_function_use); 77 Diag(D->getLocation(), diag::note_unavailable_here) << true; 78 return true; 79 } 80 } 81 82 // See if the decl is unavailable 83 if (D->getAttr<UnavailableAttr>()) { 84 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 85 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 86 } 87 88 return false; 89} 90 91SourceRange Sema::getExprRange(ExprTy *E) const { 92 Expr *Ex = (Expr *)E; 93 return Ex? Ex->getSourceRange() : SourceRange(); 94} 95 96//===----------------------------------------------------------------------===// 97// Standard Promotions and Conversions 98//===----------------------------------------------------------------------===// 99 100/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 101void Sema::DefaultFunctionArrayConversion(Expr *&E) { 102 QualType Ty = E->getType(); 103 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 104 105 if (Ty->isFunctionType()) 106 ImpCastExprToType(E, Context.getPointerType(Ty)); 107 else if (Ty->isArrayType()) { 108 // In C90 mode, arrays only promote to pointers if the array expression is 109 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 110 // type 'array of type' is converted to an expression that has type 'pointer 111 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 112 // that has type 'array of type' ...". The relevant change is "an lvalue" 113 // (C90) to "an expression" (C99). 114 // 115 // C++ 4.2p1: 116 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 117 // T" can be converted to an rvalue of type "pointer to T". 118 // 119 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 120 E->isLvalue(Context) == Expr::LV_Valid) 121 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 122 } 123} 124 125/// \brief Whether this is a promotable bitfield reference according 126/// to C99 6.3.1.1p2, bullet 2. 127/// 128/// \returns the type this bit-field will promote to, or NULL if no 129/// promotion occurs. 130static QualType isPromotableBitField(Expr *E, ASTContext &Context) { 131 FieldDecl *Field = E->getBitField(); 132 if (!Field) 133 return QualType(); 134 135 const BuiltinType *BT = Field->getType()->getAsBuiltinType(); 136 if (!BT) 137 return QualType(); 138 139 if (BT->getKind() != BuiltinType::Bool && 140 BT->getKind() != BuiltinType::Int && 141 BT->getKind() != BuiltinType::UInt) 142 return QualType(); 143 144 llvm::APSInt BitWidthAP; 145 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) 146 return QualType(); 147 148 uint64_t BitWidth = BitWidthAP.getZExtValue(); 149 uint64_t IntSize = Context.getTypeSize(Context.IntTy); 150 if (BitWidth < IntSize || 151 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) 152 return Context.IntTy; 153 154 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) 155 return Context.UnsignedIntTy; 156 157 return QualType(); 158} 159 160/// UsualUnaryConversions - Performs various conversions that are common to most 161/// operators (C99 6.3). The conversions of array and function types are 162/// sometimes surpressed. For example, the array->pointer conversion doesn't 163/// apply if the array is an argument to the sizeof or address (&) operators. 164/// In these instances, this routine should *not* be called. 165Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 166 QualType Ty = Expr->getType(); 167 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 168 169 // C99 6.3.1.1p2: 170 // 171 // The following may be used in an expression wherever an int or 172 // unsigned int may be used: 173 // - an object or expression with an integer type whose integer 174 // conversion rank is less than or equal to the rank of int 175 // and unsigned int. 176 // - A bit-field of type _Bool, int, signed int, or unsigned int. 177 // 178 // If an int can represent all values of the original type, the 179 // value is converted to an int; otherwise, it is converted to an 180 // unsigned int. These are called the integer promotions. All 181 // other types are unchanged by the integer promotions. 182 if (Ty->isPromotableIntegerType()) { 183 ImpCastExprToType(Expr, Context.IntTy); 184 return Expr; 185 } else { 186 QualType T = isPromotableBitField(Expr, Context); 187 if (!T.isNull()) { 188 ImpCastExprToType(Expr, T); 189 return Expr; 190 } 191 } 192 193 DefaultFunctionArrayConversion(Expr); 194 return Expr; 195} 196 197/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 198/// do not have a prototype. Arguments that have type float are promoted to 199/// double. All other argument types are converted by UsualUnaryConversions(). 200void Sema::DefaultArgumentPromotion(Expr *&Expr) { 201 QualType Ty = Expr->getType(); 202 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 203 204 // If this is a 'float' (CVR qualified or typedef) promote to double. 205 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 206 if (BT->getKind() == BuiltinType::Float) 207 return ImpCastExprToType(Expr, Context.DoubleTy); 208 209 UsualUnaryConversions(Expr); 210} 211 212/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 213/// will warn if the resulting type is not a POD type, and rejects ObjC 214/// interfaces passed by value. This returns true if the argument type is 215/// completely illegal. 216bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 217 DefaultArgumentPromotion(Expr); 218 219 if (Expr->getType()->isObjCInterfaceType()) { 220 Diag(Expr->getLocStart(), 221 diag::err_cannot_pass_objc_interface_to_vararg) 222 << Expr->getType() << CT; 223 return true; 224 } 225 226 if (!Expr->getType()->isPODType()) 227 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 228 << Expr->getType() << CT; 229 230 return false; 231} 232 233 234/// UsualArithmeticConversions - Performs various conversions that are common to 235/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 236/// routine returns the first non-arithmetic type found. The client is 237/// responsible for emitting appropriate error diagnostics. 238/// FIXME: verify the conversion rules for "complex int" are consistent with 239/// GCC. 240QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 241 bool isCompAssign) { 242 if (!isCompAssign) 243 UsualUnaryConversions(lhsExpr); 244 245 UsualUnaryConversions(rhsExpr); 246 247 // For conversion purposes, we ignore any qualifiers. 248 // For example, "const float" and "float" are equivalent. 249 QualType lhs = 250 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 251 QualType rhs = 252 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 253 254 // If both types are identical, no conversion is needed. 255 if (lhs == rhs) 256 return lhs; 257 258 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 259 // The caller can deal with this (e.g. pointer + int). 260 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 261 return lhs; 262 263 // Perform bitfield promotions. 264 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); 265 if (!LHSBitfieldPromoteTy.isNull()) 266 lhs = LHSBitfieldPromoteTy; 267 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); 268 if (!RHSBitfieldPromoteTy.isNull()) 269 rhs = RHSBitfieldPromoteTy; 270 271 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 272 if (!isCompAssign) 273 ImpCastExprToType(lhsExpr, destType); 274 ImpCastExprToType(rhsExpr, destType); 275 return destType; 276} 277 278QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 279 // Perform the usual unary conversions. We do this early so that 280 // integral promotions to "int" can allow us to exit early, in the 281 // lhs == rhs check. Also, for conversion purposes, we ignore any 282 // qualifiers. For example, "const float" and "float" are 283 // equivalent. 284 if (lhs->isPromotableIntegerType()) 285 lhs = Context.IntTy; 286 else 287 lhs = lhs.getUnqualifiedType(); 288 if (rhs->isPromotableIntegerType()) 289 rhs = Context.IntTy; 290 else 291 rhs = rhs.getUnqualifiedType(); 292 293 // If both types are identical, no conversion is needed. 294 if (lhs == rhs) 295 return lhs; 296 297 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 298 // The caller can deal with this (e.g. pointer + int). 299 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 300 return lhs; 301 302 // At this point, we have two different arithmetic types. 303 304 // Handle complex types first (C99 6.3.1.8p1). 305 if (lhs->isComplexType() || rhs->isComplexType()) { 306 // if we have an integer operand, the result is the complex type. 307 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 308 // convert the rhs to the lhs complex type. 309 return lhs; 310 } 311 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 312 // convert the lhs to the rhs complex type. 313 return rhs; 314 } 315 // This handles complex/complex, complex/float, or float/complex. 316 // When both operands are complex, the shorter operand is converted to the 317 // type of the longer, and that is the type of the result. This corresponds 318 // to what is done when combining two real floating-point operands. 319 // The fun begins when size promotion occur across type domains. 320 // From H&S 6.3.4: When one operand is complex and the other is a real 321 // floating-point type, the less precise type is converted, within it's 322 // real or complex domain, to the precision of the other type. For example, 323 // when combining a "long double" with a "double _Complex", the 324 // "double _Complex" is promoted to "long double _Complex". 325 int result = Context.getFloatingTypeOrder(lhs, rhs); 326 327 if (result > 0) { // The left side is bigger, convert rhs. 328 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 329 } else if (result < 0) { // The right side is bigger, convert lhs. 330 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 331 } 332 // At this point, lhs and rhs have the same rank/size. Now, make sure the 333 // domains match. This is a requirement for our implementation, C99 334 // does not require this promotion. 335 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 336 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 337 return rhs; 338 } else { // handle "_Complex double, double". 339 return lhs; 340 } 341 } 342 return lhs; // The domain/size match exactly. 343 } 344 // Now handle "real" floating types (i.e. float, double, long double). 345 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 346 // if we have an integer operand, the result is the real floating type. 347 if (rhs->isIntegerType()) { 348 // convert rhs to the lhs floating point type. 349 return lhs; 350 } 351 if (rhs->isComplexIntegerType()) { 352 // convert rhs to the complex floating point type. 353 return Context.getComplexType(lhs); 354 } 355 if (lhs->isIntegerType()) { 356 // convert lhs to the rhs floating point type. 357 return rhs; 358 } 359 if (lhs->isComplexIntegerType()) { 360 // convert lhs to the complex floating point type. 361 return Context.getComplexType(rhs); 362 } 363 // We have two real floating types, float/complex combos were handled above. 364 // Convert the smaller operand to the bigger result. 365 int result = Context.getFloatingTypeOrder(lhs, rhs); 366 if (result > 0) // convert the rhs 367 return lhs; 368 assert(result < 0 && "illegal float comparison"); 369 return rhs; // convert the lhs 370 } 371 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 372 // Handle GCC complex int extension. 373 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 374 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 375 376 if (lhsComplexInt && rhsComplexInt) { 377 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 378 rhsComplexInt->getElementType()) >= 0) 379 return lhs; // convert the rhs 380 return rhs; 381 } else if (lhsComplexInt && rhs->isIntegerType()) { 382 // convert the rhs to the lhs complex type. 383 return lhs; 384 } else if (rhsComplexInt && lhs->isIntegerType()) { 385 // convert the lhs to the rhs complex type. 386 return rhs; 387 } 388 } 389 // Finally, we have two differing integer types. 390 // The rules for this case are in C99 6.3.1.8 391 int compare = Context.getIntegerTypeOrder(lhs, rhs); 392 bool lhsSigned = lhs->isSignedIntegerType(), 393 rhsSigned = rhs->isSignedIntegerType(); 394 QualType destType; 395 if (lhsSigned == rhsSigned) { 396 // Same signedness; use the higher-ranked type 397 destType = compare >= 0 ? lhs : rhs; 398 } else if (compare != (lhsSigned ? 1 : -1)) { 399 // The unsigned type has greater than or equal rank to the 400 // signed type, so use the unsigned type 401 destType = lhsSigned ? rhs : lhs; 402 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 403 // The two types are different widths; if we are here, that 404 // means the signed type is larger than the unsigned type, so 405 // use the signed type. 406 destType = lhsSigned ? lhs : rhs; 407 } else { 408 // The signed type is higher-ranked than the unsigned type, 409 // but isn't actually any bigger (like unsigned int and long 410 // on most 32-bit systems). Use the unsigned type corresponding 411 // to the signed type. 412 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 413 } 414 return destType; 415} 416 417//===----------------------------------------------------------------------===// 418// Semantic Analysis for various Expression Types 419//===----------------------------------------------------------------------===// 420 421 422/// ActOnStringLiteral - The specified tokens were lexed as pasted string 423/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 424/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 425/// multiple tokens. However, the common case is that StringToks points to one 426/// string. 427/// 428Action::OwningExprResult 429Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 430 assert(NumStringToks && "Must have at least one string!"); 431 432 StringLiteralParser Literal(StringToks, NumStringToks, PP); 433 if (Literal.hadError) 434 return ExprError(); 435 436 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 437 for (unsigned i = 0; i != NumStringToks; ++i) 438 StringTokLocs.push_back(StringToks[i].getLocation()); 439 440 QualType StrTy = Context.CharTy; 441 if (Literal.AnyWide) StrTy = Context.getWCharType(); 442 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 443 444 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 445 if (getLangOptions().CPlusPlus) 446 StrTy.addConst(); 447 448 // Get an array type for the string, according to C99 6.4.5. This includes 449 // the nul terminator character as well as the string length for pascal 450 // strings. 451 StrTy = Context.getConstantArrayType(StrTy, 452 llvm::APInt(32, Literal.GetNumStringChars()+1), 453 ArrayType::Normal, 0); 454 455 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 456 return Owned(StringLiteral::Create(Context, Literal.GetString(), 457 Literal.GetStringLength(), 458 Literal.AnyWide, StrTy, 459 &StringTokLocs[0], 460 StringTokLocs.size())); 461} 462 463/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 464/// CurBlock to VD should cause it to be snapshotted (as we do for auto 465/// variables defined outside the block) or false if this is not needed (e.g. 466/// for values inside the block or for globals). 467/// 468/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 469/// up-to-date. 470/// 471static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 472 ValueDecl *VD) { 473 // If the value is defined inside the block, we couldn't snapshot it even if 474 // we wanted to. 475 if (CurBlock->TheDecl == VD->getDeclContext()) 476 return false; 477 478 // If this is an enum constant or function, it is constant, don't snapshot. 479 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 480 return false; 481 482 // If this is a reference to an extern, static, or global variable, no need to 483 // snapshot it. 484 // FIXME: What about 'const' variables in C++? 485 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 486 if (!Var->hasLocalStorage()) 487 return false; 488 489 // Blocks that have these can't be constant. 490 CurBlock->hasBlockDeclRefExprs = true; 491 492 // If we have nested blocks, the decl may be declared in an outer block (in 493 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 494 // be defined outside all of the current blocks (in which case the blocks do 495 // all get the bit). Walk the nesting chain. 496 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 497 NextBlock = NextBlock->PrevBlockInfo) { 498 // If we found the defining block for the variable, don't mark the block as 499 // having a reference outside it. 500 if (NextBlock->TheDecl == VD->getDeclContext()) 501 break; 502 503 // Otherwise, the DeclRef from the inner block causes the outer one to need 504 // a snapshot as well. 505 NextBlock->hasBlockDeclRefExprs = true; 506 } 507 508 return true; 509} 510 511 512 513/// ActOnIdentifierExpr - The parser read an identifier in expression context, 514/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 515/// identifier is used in a function call context. 516/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 517/// class or namespace that the identifier must be a member of. 518Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 519 IdentifierInfo &II, 520 bool HasTrailingLParen, 521 const CXXScopeSpec *SS, 522 bool isAddressOfOperand) { 523 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 524 isAddressOfOperand); 525} 526 527/// BuildDeclRefExpr - Build either a DeclRefExpr or a 528/// QualifiedDeclRefExpr based on whether or not SS is a 529/// nested-name-specifier. 530DeclRefExpr * 531Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 532 bool TypeDependent, bool ValueDependent, 533 const CXXScopeSpec *SS) { 534 if (SS && !SS->isEmpty()) { 535 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 536 ValueDependent, SS->getRange(), 537 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 538 } else 539 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 540} 541 542/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 543/// variable corresponding to the anonymous union or struct whose type 544/// is Record. 545static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 546 RecordDecl *Record) { 547 assert(Record->isAnonymousStructOrUnion() && 548 "Record must be an anonymous struct or union!"); 549 550 // FIXME: Once Decls are directly linked together, this will 551 // be an O(1) operation rather than a slow walk through DeclContext's 552 // vector (which itself will be eliminated). DeclGroups might make 553 // this even better. 554 DeclContext *Ctx = Record->getDeclContext(); 555 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 556 DEnd = Ctx->decls_end(Context); 557 D != DEnd; ++D) { 558 if (*D == Record) { 559 // The object for the anonymous struct/union directly 560 // follows its type in the list of declarations. 561 ++D; 562 assert(D != DEnd && "Missing object for anonymous record"); 563 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 564 return *D; 565 } 566 } 567 568 assert(false && "Missing object for anonymous record"); 569 return 0; 570} 571 572/// \brief Given a field that represents a member of an anonymous 573/// struct/union, build the path from that field's context to the 574/// actual member. 575/// 576/// Construct the sequence of field member references we'll have to 577/// perform to get to the field in the anonymous union/struct. The 578/// list of members is built from the field outward, so traverse it 579/// backwards to go from an object in the current context to the field 580/// we found. 581/// 582/// \returns The variable from which the field access should begin, 583/// for an anonymous struct/union that is not a member of another 584/// class. Otherwise, returns NULL. 585VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 586 llvm::SmallVectorImpl<FieldDecl *> &Path) { 587 assert(Field->getDeclContext()->isRecord() && 588 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 589 && "Field must be stored inside an anonymous struct or union"); 590 591 Path.push_back(Field); 592 VarDecl *BaseObject = 0; 593 DeclContext *Ctx = Field->getDeclContext(); 594 do { 595 RecordDecl *Record = cast<RecordDecl>(Ctx); 596 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 597 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 598 Path.push_back(AnonField); 599 else { 600 BaseObject = cast<VarDecl>(AnonObject); 601 break; 602 } 603 Ctx = Ctx->getParent(); 604 } while (Ctx->isRecord() && 605 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 606 607 return BaseObject; 608} 609 610Sema::OwningExprResult 611Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 612 FieldDecl *Field, 613 Expr *BaseObjectExpr, 614 SourceLocation OpLoc) { 615 llvm::SmallVector<FieldDecl *, 4> AnonFields; 616 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 617 AnonFields); 618 619 // Build the expression that refers to the base object, from 620 // which we will build a sequence of member references to each 621 // of the anonymous union objects and, eventually, the field we 622 // found via name lookup. 623 bool BaseObjectIsPointer = false; 624 unsigned ExtraQuals = 0; 625 if (BaseObject) { 626 // BaseObject is an anonymous struct/union variable (and is, 627 // therefore, not part of another non-anonymous record). 628 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 629 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 630 SourceLocation()); 631 ExtraQuals 632 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 633 } else if (BaseObjectExpr) { 634 // The caller provided the base object expression. Determine 635 // whether its a pointer and whether it adds any qualifiers to the 636 // anonymous struct/union fields we're looking into. 637 QualType ObjectType = BaseObjectExpr->getType(); 638 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 639 BaseObjectIsPointer = true; 640 ObjectType = ObjectPtr->getPointeeType(); 641 } 642 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 643 } else { 644 // We've found a member of an anonymous struct/union that is 645 // inside a non-anonymous struct/union, so in a well-formed 646 // program our base object expression is "this". 647 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 648 if (!MD->isStatic()) { 649 QualType AnonFieldType 650 = Context.getTagDeclType( 651 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 652 QualType ThisType = Context.getTagDeclType(MD->getParent()); 653 if ((Context.getCanonicalType(AnonFieldType) 654 == Context.getCanonicalType(ThisType)) || 655 IsDerivedFrom(ThisType, AnonFieldType)) { 656 // Our base object expression is "this". 657 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 658 MD->getThisType(Context)); 659 BaseObjectIsPointer = true; 660 } 661 } else { 662 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 663 << Field->getDeclName()); 664 } 665 ExtraQuals = MD->getTypeQualifiers(); 666 } 667 668 if (!BaseObjectExpr) 669 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 670 << Field->getDeclName()); 671 } 672 673 // Build the implicit member references to the field of the 674 // anonymous struct/union. 675 Expr *Result = BaseObjectExpr; 676 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 677 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 678 FI != FIEnd; ++FI) { 679 QualType MemberType = (*FI)->getType(); 680 if (!(*FI)->isMutable()) { 681 unsigned combinedQualifiers 682 = MemberType.getCVRQualifiers() | ExtraQuals; 683 MemberType = MemberType.getQualifiedType(combinedQualifiers); 684 } 685 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 686 OpLoc, MemberType); 687 BaseObjectIsPointer = false; 688 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 689 } 690 691 return Owned(Result); 692} 693 694/// ActOnDeclarationNameExpr - The parser has read some kind of name 695/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 696/// performs lookup on that name and returns an expression that refers 697/// to that name. This routine isn't directly called from the parser, 698/// because the parser doesn't know about DeclarationName. Rather, 699/// this routine is called by ActOnIdentifierExpr, 700/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 701/// which form the DeclarationName from the corresponding syntactic 702/// forms. 703/// 704/// HasTrailingLParen indicates whether this identifier is used in a 705/// function call context. LookupCtx is only used for a C++ 706/// qualified-id (foo::bar) to indicate the class or namespace that 707/// the identifier must be a member of. 708/// 709/// isAddressOfOperand means that this expression is the direct operand 710/// of an address-of operator. This matters because this is the only 711/// situation where a qualified name referencing a non-static member may 712/// appear outside a member function of this class. 713Sema::OwningExprResult 714Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 715 DeclarationName Name, bool HasTrailingLParen, 716 const CXXScopeSpec *SS, 717 bool isAddressOfOperand) { 718 // Could be enum-constant, value decl, instance variable, etc. 719 if (SS && SS->isInvalid()) 720 return ExprError(); 721 722 // C++ [temp.dep.expr]p3: 723 // An id-expression is type-dependent if it contains: 724 // -- a nested-name-specifier that contains a class-name that 725 // names a dependent type. 726 if (SS && isDependentScopeSpecifier(*SS)) { 727 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 728 Loc, SS->getRange(), 729 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 730 } 731 732 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 733 false, true, Loc); 734 735 if (Lookup.isAmbiguous()) { 736 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 737 SS && SS->isSet() ? SS->getRange() 738 : SourceRange()); 739 return ExprError(); 740 } 741 742 NamedDecl *D = Lookup.getAsDecl(); 743 744 // If this reference is in an Objective-C method, then ivar lookup happens as 745 // well. 746 IdentifierInfo *II = Name.getAsIdentifierInfo(); 747 if (II && getCurMethodDecl()) { 748 // There are two cases to handle here. 1) scoped lookup could have failed, 749 // in which case we should look for an ivar. 2) scoped lookup could have 750 // found a decl, but that decl is outside the current instance method (i.e. 751 // a global variable). In these two cases, we do a lookup for an ivar with 752 // this name, if the lookup sucedes, we replace it our current decl. 753 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 754 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 755 ObjCInterfaceDecl *ClassDeclared; 756 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 757 ClassDeclared)) { 758 // Check if referencing a field with __attribute__((deprecated)). 759 if (DiagnoseUseOfDecl(IV, Loc)) 760 return ExprError(); 761 762 // If we're referencing an invalid decl, just return this as a silent 763 // error node. The error diagnostic was already emitted on the decl. 764 if (IV->isInvalidDecl()) 765 return ExprError(); 766 767 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 768 // If a class method attemps to use a free standing ivar, this is 769 // an error. 770 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 771 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 772 << IV->getDeclName()); 773 // If a class method uses a global variable, even if an ivar with 774 // same name exists, use the global. 775 if (!IsClsMethod) { 776 if (IV->getAccessControl() == ObjCIvarDecl::Private && 777 ClassDeclared != IFace) 778 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 779 // FIXME: This should use a new expr for a direct reference, don't turn 780 // this into Self->ivar, just return a BareIVarExpr or something. 781 IdentifierInfo &II = Context.Idents.get("self"); 782 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 783 return Owned(new (Context) 784 ObjCIvarRefExpr(IV, IV->getType(), Loc, 785 SelfExpr.takeAs<Expr>(), true, true)); 786 } 787 } 788 } 789 else if (getCurMethodDecl()->isInstanceMethod()) { 790 // We should warn if a local variable hides an ivar. 791 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 792 ObjCInterfaceDecl *ClassDeclared; 793 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 794 ClassDeclared)) { 795 if (IV->getAccessControl() != ObjCIvarDecl::Private || 796 IFace == ClassDeclared) 797 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 798 } 799 } 800 // Needed to implement property "super.method" notation. 801 if (D == 0 && II->isStr("super")) { 802 QualType T; 803 804 if (getCurMethodDecl()->isInstanceMethod()) 805 T = Context.getPointerType(Context.getObjCInterfaceType( 806 getCurMethodDecl()->getClassInterface())); 807 else 808 T = Context.getObjCClassType(); 809 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 810 } 811 } 812 813 // Determine whether this name might be a candidate for 814 // argument-dependent lookup. 815 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 816 HasTrailingLParen; 817 818 if (ADL && D == 0) { 819 // We've seen something of the form 820 // 821 // identifier( 822 // 823 // and we did not find any entity by the name 824 // "identifier". However, this identifier is still subject to 825 // argument-dependent lookup, so keep track of the name. 826 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 827 Context.OverloadTy, 828 Loc)); 829 } 830 831 if (D == 0) { 832 // Otherwise, this could be an implicitly declared function reference (legal 833 // in C90, extension in C99). 834 if (HasTrailingLParen && II && 835 !getLangOptions().CPlusPlus) // Not in C++. 836 D = ImplicitlyDefineFunction(Loc, *II, S); 837 else { 838 // If this name wasn't predeclared and if this is not a function call, 839 // diagnose the problem. 840 if (SS && !SS->isEmpty()) 841 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 842 << Name << SS->getRange()); 843 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 844 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 845 return ExprError(Diag(Loc, diag::err_undeclared_use) 846 << Name.getAsString()); 847 else 848 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 849 } 850 } 851 852 // If this is an expression of the form &Class::member, don't build an 853 // implicit member ref, because we want a pointer to the member in general, 854 // not any specific instance's member. 855 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 856 DeclContext *DC = computeDeclContext(*SS); 857 if (D && isa<CXXRecordDecl>(DC)) { 858 QualType DType; 859 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 860 DType = FD->getType().getNonReferenceType(); 861 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 862 DType = Method->getType(); 863 } else if (isa<OverloadedFunctionDecl>(D)) { 864 DType = Context.OverloadTy; 865 } 866 // Could be an inner type. That's diagnosed below, so ignore it here. 867 if (!DType.isNull()) { 868 // The pointer is type- and value-dependent if it points into something 869 // dependent. 870 bool Dependent = false; 871 for (; DC; DC = DC->getParent()) { 872 // FIXME: could stop early at namespace scope. 873 if (DC->isRecord()) { 874 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 875 if (Context.getTypeDeclType(Record)->isDependentType()) { 876 Dependent = true; 877 break; 878 } 879 } 880 } 881 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 882 } 883 } 884 } 885 886 // We may have found a field within an anonymous union or struct 887 // (C++ [class.union]). 888 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 889 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 890 return BuildAnonymousStructUnionMemberReference(Loc, FD); 891 892 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 893 if (!MD->isStatic()) { 894 // C++ [class.mfct.nonstatic]p2: 895 // [...] if name lookup (3.4.1) resolves the name in the 896 // id-expression to a nonstatic nontype member of class X or of 897 // a base class of X, the id-expression is transformed into a 898 // class member access expression (5.2.5) using (*this) (9.3.2) 899 // as the postfix-expression to the left of the '.' operator. 900 DeclContext *Ctx = 0; 901 QualType MemberType; 902 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 903 Ctx = FD->getDeclContext(); 904 MemberType = FD->getType(); 905 906 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 907 MemberType = RefType->getPointeeType(); 908 else if (!FD->isMutable()) { 909 unsigned combinedQualifiers 910 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 911 MemberType = MemberType.getQualifiedType(combinedQualifiers); 912 } 913 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 914 if (!Method->isStatic()) { 915 Ctx = Method->getParent(); 916 MemberType = Method->getType(); 917 } 918 } else if (OverloadedFunctionDecl *Ovl 919 = dyn_cast<OverloadedFunctionDecl>(D)) { 920 for (OverloadedFunctionDecl::function_iterator 921 Func = Ovl->function_begin(), 922 FuncEnd = Ovl->function_end(); 923 Func != FuncEnd; ++Func) { 924 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 925 if (!DMethod->isStatic()) { 926 Ctx = Ovl->getDeclContext(); 927 MemberType = Context.OverloadTy; 928 break; 929 } 930 } 931 } 932 933 if (Ctx && Ctx->isRecord()) { 934 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 935 QualType ThisType = Context.getTagDeclType(MD->getParent()); 936 if ((Context.getCanonicalType(CtxType) 937 == Context.getCanonicalType(ThisType)) || 938 IsDerivedFrom(ThisType, CtxType)) { 939 // Build the implicit member access expression. 940 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 941 MD->getThisType(Context)); 942 return Owned(new (Context) MemberExpr(This, true, D, 943 Loc, MemberType)); 944 } 945 } 946 } 947 } 948 949 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 950 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 951 if (MD->isStatic()) 952 // "invalid use of member 'x' in static member function" 953 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 954 << FD->getDeclName()); 955 } 956 957 // Any other ways we could have found the field in a well-formed 958 // program would have been turned into implicit member expressions 959 // above. 960 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 961 << FD->getDeclName()); 962 } 963 964 if (isa<TypedefDecl>(D)) 965 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 966 if (isa<ObjCInterfaceDecl>(D)) 967 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 968 if (isa<NamespaceDecl>(D)) 969 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 970 971 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 972 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 973 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 974 false, false, SS)); 975 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 976 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 977 false, false, SS)); 978 ValueDecl *VD = cast<ValueDecl>(D); 979 980 // Check whether this declaration can be used. Note that we suppress 981 // this check when we're going to perform argument-dependent lookup 982 // on this function name, because this might not be the function 983 // that overload resolution actually selects. 984 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 985 return ExprError(); 986 987 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 988 // Warn about constructs like: 989 // if (void *X = foo()) { ... } else { X }. 990 // In the else block, the pointer is always false. 991 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 992 Scope *CheckS = S; 993 while (CheckS) { 994 if (CheckS->isWithinElse() && 995 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 996 if (Var->getType()->isBooleanType()) 997 ExprError(Diag(Loc, diag::warn_value_always_false) 998 << Var->getDeclName()); 999 else 1000 ExprError(Diag(Loc, diag::warn_value_always_zero) 1001 << Var->getDeclName()); 1002 break; 1003 } 1004 1005 // Move up one more control parent to check again. 1006 CheckS = CheckS->getControlParent(); 1007 if (CheckS) 1008 CheckS = CheckS->getParent(); 1009 } 1010 } 1011 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 1012 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1013 // C99 DR 316 says that, if a function type comes from a 1014 // function definition (without a prototype), that type is only 1015 // used for checking compatibility. Therefore, when referencing 1016 // the function, we pretend that we don't have the full function 1017 // type. 1018 QualType T = Func->getType(); 1019 QualType NoProtoType = T; 1020 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1021 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1022 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 1023 } 1024 } 1025 1026 // Only create DeclRefExpr's for valid Decl's. 1027 if (VD->isInvalidDecl()) 1028 return ExprError(); 1029 1030 // If the identifier reference is inside a block, and it refers to a value 1031 // that is outside the block, create a BlockDeclRefExpr instead of a 1032 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1033 // the block is formed. 1034 // 1035 // We do not do this for things like enum constants, global variables, etc, 1036 // as they do not get snapshotted. 1037 // 1038 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1039 QualType ExprTy = VD->getType().getNonReferenceType(); 1040 // The BlocksAttr indicates the variable is bound by-reference. 1041 if (VD->getAttr<BlocksAttr>()) 1042 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1043 1044 // Variable will be bound by-copy, make it const within the closure. 1045 ExprTy.addConst(); 1046 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 1047 } 1048 // If this reference is not in a block or if the referenced variable is 1049 // within the block, create a normal DeclRefExpr. 1050 1051 bool TypeDependent = false; 1052 bool ValueDependent = false; 1053 if (getLangOptions().CPlusPlus) { 1054 // C++ [temp.dep.expr]p3: 1055 // An id-expression is type-dependent if it contains: 1056 // - an identifier that was declared with a dependent type, 1057 if (VD->getType()->isDependentType()) 1058 TypeDependent = true; 1059 // - FIXME: a template-id that is dependent, 1060 // - a conversion-function-id that specifies a dependent type, 1061 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1062 Name.getCXXNameType()->isDependentType()) 1063 TypeDependent = true; 1064 // - a nested-name-specifier that contains a class-name that 1065 // names a dependent type. 1066 else if (SS && !SS->isEmpty()) { 1067 for (DeclContext *DC = computeDeclContext(*SS); 1068 DC; DC = DC->getParent()) { 1069 // FIXME: could stop early at namespace scope. 1070 if (DC->isRecord()) { 1071 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1072 if (Context.getTypeDeclType(Record)->isDependentType()) { 1073 TypeDependent = true; 1074 break; 1075 } 1076 } 1077 } 1078 } 1079 1080 // C++ [temp.dep.constexpr]p2: 1081 // 1082 // An identifier is value-dependent if it is: 1083 // - a name declared with a dependent type, 1084 if (TypeDependent) 1085 ValueDependent = true; 1086 // - the name of a non-type template parameter, 1087 else if (isa<NonTypeTemplateParmDecl>(VD)) 1088 ValueDependent = true; 1089 // - a constant with integral or enumeration type and is 1090 // initialized with an expression that is value-dependent 1091 // (FIXME!). 1092 } 1093 1094 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1095 TypeDependent, ValueDependent, SS)); 1096} 1097 1098Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1099 tok::TokenKind Kind) { 1100 PredefinedExpr::IdentType IT; 1101 1102 switch (Kind) { 1103 default: assert(0 && "Unknown simple primary expr!"); 1104 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1105 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1106 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1107 } 1108 1109 // Pre-defined identifiers are of type char[x], where x is the length of the 1110 // string. 1111 unsigned Length; 1112 if (FunctionDecl *FD = getCurFunctionDecl()) 1113 Length = FD->getIdentifier()->getLength(); 1114 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1115 Length = MD->getSynthesizedMethodSize(); 1116 else { 1117 Diag(Loc, diag::ext_predef_outside_function); 1118 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1119 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1120 } 1121 1122 1123 llvm::APInt LengthI(32, Length + 1); 1124 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1125 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1126 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1127} 1128 1129Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1130 llvm::SmallString<16> CharBuffer; 1131 CharBuffer.resize(Tok.getLength()); 1132 const char *ThisTokBegin = &CharBuffer[0]; 1133 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1134 1135 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1136 Tok.getLocation(), PP); 1137 if (Literal.hadError()) 1138 return ExprError(); 1139 1140 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1141 1142 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1143 Literal.isWide(), 1144 type, Tok.getLocation())); 1145} 1146 1147Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1148 // Fast path for a single digit (which is quite common). A single digit 1149 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1150 if (Tok.getLength() == 1) { 1151 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1152 unsigned IntSize = Context.Target.getIntWidth(); 1153 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1154 Context.IntTy, Tok.getLocation())); 1155 } 1156 1157 llvm::SmallString<512> IntegerBuffer; 1158 // Add padding so that NumericLiteralParser can overread by one character. 1159 IntegerBuffer.resize(Tok.getLength()+1); 1160 const char *ThisTokBegin = &IntegerBuffer[0]; 1161 1162 // Get the spelling of the token, which eliminates trigraphs, etc. 1163 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1164 1165 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1166 Tok.getLocation(), PP); 1167 if (Literal.hadError) 1168 return ExprError(); 1169 1170 Expr *Res; 1171 1172 if (Literal.isFloatingLiteral()) { 1173 QualType Ty; 1174 if (Literal.isFloat) 1175 Ty = Context.FloatTy; 1176 else if (!Literal.isLong) 1177 Ty = Context.DoubleTy; 1178 else 1179 Ty = Context.LongDoubleTy; 1180 1181 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1182 1183 // isExact will be set by GetFloatValue(). 1184 bool isExact = false; 1185 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1186 &isExact, Ty, Tok.getLocation()); 1187 1188 } else if (!Literal.isIntegerLiteral()) { 1189 return ExprError(); 1190 } else { 1191 QualType Ty; 1192 1193 // long long is a C99 feature. 1194 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1195 Literal.isLongLong) 1196 Diag(Tok.getLocation(), diag::ext_longlong); 1197 1198 // Get the value in the widest-possible width. 1199 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1200 1201 if (Literal.GetIntegerValue(ResultVal)) { 1202 // If this value didn't fit into uintmax_t, warn and force to ull. 1203 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1204 Ty = Context.UnsignedLongLongTy; 1205 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1206 "long long is not intmax_t?"); 1207 } else { 1208 // If this value fits into a ULL, try to figure out what else it fits into 1209 // according to the rules of C99 6.4.4.1p5. 1210 1211 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1212 // be an unsigned int. 1213 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1214 1215 // Check from smallest to largest, picking the smallest type we can. 1216 unsigned Width = 0; 1217 if (!Literal.isLong && !Literal.isLongLong) { 1218 // Are int/unsigned possibilities? 1219 unsigned IntSize = Context.Target.getIntWidth(); 1220 1221 // Does it fit in a unsigned int? 1222 if (ResultVal.isIntN(IntSize)) { 1223 // Does it fit in a signed int? 1224 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1225 Ty = Context.IntTy; 1226 else if (AllowUnsigned) 1227 Ty = Context.UnsignedIntTy; 1228 Width = IntSize; 1229 } 1230 } 1231 1232 // Are long/unsigned long possibilities? 1233 if (Ty.isNull() && !Literal.isLongLong) { 1234 unsigned LongSize = Context.Target.getLongWidth(); 1235 1236 // Does it fit in a unsigned long? 1237 if (ResultVal.isIntN(LongSize)) { 1238 // Does it fit in a signed long? 1239 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1240 Ty = Context.LongTy; 1241 else if (AllowUnsigned) 1242 Ty = Context.UnsignedLongTy; 1243 Width = LongSize; 1244 } 1245 } 1246 1247 // Finally, check long long if needed. 1248 if (Ty.isNull()) { 1249 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1250 1251 // Does it fit in a unsigned long long? 1252 if (ResultVal.isIntN(LongLongSize)) { 1253 // Does it fit in a signed long long? 1254 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1255 Ty = Context.LongLongTy; 1256 else if (AllowUnsigned) 1257 Ty = Context.UnsignedLongLongTy; 1258 Width = LongLongSize; 1259 } 1260 } 1261 1262 // If we still couldn't decide a type, we probably have something that 1263 // does not fit in a signed long long, but has no U suffix. 1264 if (Ty.isNull()) { 1265 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1266 Ty = Context.UnsignedLongLongTy; 1267 Width = Context.Target.getLongLongWidth(); 1268 } 1269 1270 if (ResultVal.getBitWidth() != Width) 1271 ResultVal.trunc(Width); 1272 } 1273 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1274 } 1275 1276 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1277 if (Literal.isImaginary) 1278 Res = new (Context) ImaginaryLiteral(Res, 1279 Context.getComplexType(Res->getType())); 1280 1281 return Owned(Res); 1282} 1283 1284Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1285 SourceLocation R, ExprArg Val) { 1286 Expr *E = Val.takeAs<Expr>(); 1287 assert((E != 0) && "ActOnParenExpr() missing expr"); 1288 return Owned(new (Context) ParenExpr(L, R, E)); 1289} 1290 1291/// The UsualUnaryConversions() function is *not* called by this routine. 1292/// See C99 6.3.2.1p[2-4] for more details. 1293bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1294 SourceLocation OpLoc, 1295 const SourceRange &ExprRange, 1296 bool isSizeof) { 1297 if (exprType->isDependentType()) 1298 return false; 1299 1300 // C99 6.5.3.4p1: 1301 if (isa<FunctionType>(exprType)) { 1302 // alignof(function) is allowed as an extension. 1303 if (isSizeof) 1304 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1305 return false; 1306 } 1307 1308 // Allow sizeof(void)/alignof(void) as an extension. 1309 if (exprType->isVoidType()) { 1310 Diag(OpLoc, diag::ext_sizeof_void_type) 1311 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1312 return false; 1313 } 1314 1315 if (RequireCompleteType(OpLoc, exprType, 1316 isSizeof ? diag::err_sizeof_incomplete_type : 1317 diag::err_alignof_incomplete_type, 1318 ExprRange)) 1319 return true; 1320 1321 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1322 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1323 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1324 << exprType << isSizeof << ExprRange; 1325 return true; 1326 } 1327 1328 return false; 1329} 1330 1331bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1332 const SourceRange &ExprRange) { 1333 E = E->IgnoreParens(); 1334 1335 // alignof decl is always ok. 1336 if (isa<DeclRefExpr>(E)) 1337 return false; 1338 1339 // Cannot know anything else if the expression is dependent. 1340 if (E->isTypeDependent()) 1341 return false; 1342 1343 if (E->getBitField()) { 1344 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1345 return true; 1346 } 1347 1348 // Alignment of a field access is always okay, so long as it isn't a 1349 // bit-field. 1350 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1351 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1352 return false; 1353 1354 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1355} 1356 1357/// \brief Build a sizeof or alignof expression given a type operand. 1358Action::OwningExprResult 1359Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1360 bool isSizeOf, SourceRange R) { 1361 if (T.isNull()) 1362 return ExprError(); 1363 1364 if (!T->isDependentType() && 1365 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1366 return ExprError(); 1367 1368 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1369 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1370 Context.getSizeType(), OpLoc, 1371 R.getEnd())); 1372} 1373 1374/// \brief Build a sizeof or alignof expression given an expression 1375/// operand. 1376Action::OwningExprResult 1377Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1378 bool isSizeOf, SourceRange R) { 1379 // Verify that the operand is valid. 1380 bool isInvalid = false; 1381 if (E->isTypeDependent()) { 1382 // Delay type-checking for type-dependent expressions. 1383 } else if (!isSizeOf) { 1384 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1385 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1386 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1387 isInvalid = true; 1388 } else { 1389 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1390 } 1391 1392 if (isInvalid) 1393 return ExprError(); 1394 1395 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1396 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1397 Context.getSizeType(), OpLoc, 1398 R.getEnd())); 1399} 1400 1401/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1402/// the same for @c alignof and @c __alignof 1403/// Note that the ArgRange is invalid if isType is false. 1404Action::OwningExprResult 1405Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1406 void *TyOrEx, const SourceRange &ArgRange) { 1407 // If error parsing type, ignore. 1408 if (TyOrEx == 0) return ExprError(); 1409 1410 if (isType) { 1411 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1412 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1413 } 1414 1415 // Get the end location. 1416 Expr *ArgEx = (Expr *)TyOrEx; 1417 Action::OwningExprResult Result 1418 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1419 1420 if (Result.isInvalid()) 1421 DeleteExpr(ArgEx); 1422 1423 return move(Result); 1424} 1425 1426QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1427 if (V->isTypeDependent()) 1428 return Context.DependentTy; 1429 1430 // These operators return the element type of a complex type. 1431 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1432 return CT->getElementType(); 1433 1434 // Otherwise they pass through real integer and floating point types here. 1435 if (V->getType()->isArithmeticType()) 1436 return V->getType(); 1437 1438 // Reject anything else. 1439 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1440 << (isReal ? "__real" : "__imag"); 1441 return QualType(); 1442} 1443 1444 1445 1446Action::OwningExprResult 1447Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1448 tok::TokenKind Kind, ExprArg Input) { 1449 Expr *Arg = (Expr *)Input.get(); 1450 1451 UnaryOperator::Opcode Opc; 1452 switch (Kind) { 1453 default: assert(0 && "Unknown unary op!"); 1454 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1455 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1456 } 1457 1458 if (getLangOptions().CPlusPlus && 1459 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1460 // Which overloaded operator? 1461 OverloadedOperatorKind OverOp = 1462 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1463 1464 // C++ [over.inc]p1: 1465 // 1466 // [...] If the function is a member function with one 1467 // parameter (which shall be of type int) or a non-member 1468 // function with two parameters (the second of which shall be 1469 // of type int), it defines the postfix increment operator ++ 1470 // for objects of that type. When the postfix increment is 1471 // called as a result of using the ++ operator, the int 1472 // argument will have value zero. 1473 Expr *Args[2] = { 1474 Arg, 1475 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1476 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1477 }; 1478 1479 // Build the candidate set for overloading 1480 OverloadCandidateSet CandidateSet; 1481 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1482 1483 // Perform overload resolution. 1484 OverloadCandidateSet::iterator Best; 1485 switch (BestViableFunction(CandidateSet, Best)) { 1486 case OR_Success: { 1487 // We found a built-in operator or an overloaded operator. 1488 FunctionDecl *FnDecl = Best->Function; 1489 1490 if (FnDecl) { 1491 // We matched an overloaded operator. Build a call to that 1492 // operator. 1493 1494 // Convert the arguments. 1495 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1496 if (PerformObjectArgumentInitialization(Arg, Method)) 1497 return ExprError(); 1498 } else { 1499 // Convert the arguments. 1500 if (PerformCopyInitialization(Arg, 1501 FnDecl->getParamDecl(0)->getType(), 1502 "passing")) 1503 return ExprError(); 1504 } 1505 1506 // Determine the result type 1507 QualType ResultTy 1508 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1509 ResultTy = ResultTy.getNonReferenceType(); 1510 1511 // Build the actual expression node. 1512 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1513 SourceLocation()); 1514 UsualUnaryConversions(FnExpr); 1515 1516 Input.release(); 1517 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1518 Args, 2, ResultTy, 1519 OpLoc)); 1520 } else { 1521 // We matched a built-in operator. Convert the arguments, then 1522 // break out so that we will build the appropriate built-in 1523 // operator node. 1524 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1525 "passing")) 1526 return ExprError(); 1527 1528 break; 1529 } 1530 } 1531 1532 case OR_No_Viable_Function: 1533 // No viable function; fall through to handling this as a 1534 // built-in operator, which will produce an error message for us. 1535 break; 1536 1537 case OR_Ambiguous: 1538 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1539 << UnaryOperator::getOpcodeStr(Opc) 1540 << Arg->getSourceRange(); 1541 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1542 return ExprError(); 1543 1544 case OR_Deleted: 1545 Diag(OpLoc, diag::err_ovl_deleted_oper) 1546 << Best->Function->isDeleted() 1547 << UnaryOperator::getOpcodeStr(Opc) 1548 << Arg->getSourceRange(); 1549 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1550 return ExprError(); 1551 } 1552 1553 // Either we found no viable overloaded operator or we matched a 1554 // built-in operator. In either case, fall through to trying to 1555 // build a built-in operation. 1556 } 1557 1558 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1559 Opc == UnaryOperator::PostInc); 1560 if (result.isNull()) 1561 return ExprError(); 1562 Input.release(); 1563 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1564} 1565 1566Action::OwningExprResult 1567Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1568 ExprArg Idx, SourceLocation RLoc) { 1569 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1570 *RHSExp = static_cast<Expr*>(Idx.get()); 1571 1572 if (getLangOptions().CPlusPlus && 1573 (LHSExp->getType()->isRecordType() || 1574 LHSExp->getType()->isEnumeralType() || 1575 RHSExp->getType()->isRecordType() || 1576 RHSExp->getType()->isEnumeralType())) { 1577 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1578 // to the candidate set. 1579 OverloadCandidateSet CandidateSet; 1580 Expr *Args[2] = { LHSExp, RHSExp }; 1581 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1582 SourceRange(LLoc, RLoc)); 1583 1584 // Perform overload resolution. 1585 OverloadCandidateSet::iterator Best; 1586 switch (BestViableFunction(CandidateSet, Best)) { 1587 case OR_Success: { 1588 // We found a built-in operator or an overloaded operator. 1589 FunctionDecl *FnDecl = Best->Function; 1590 1591 if (FnDecl) { 1592 // We matched an overloaded operator. Build a call to that 1593 // operator. 1594 1595 // Convert the arguments. 1596 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1597 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1598 PerformCopyInitialization(RHSExp, 1599 FnDecl->getParamDecl(0)->getType(), 1600 "passing")) 1601 return ExprError(); 1602 } else { 1603 // Convert the arguments. 1604 if (PerformCopyInitialization(LHSExp, 1605 FnDecl->getParamDecl(0)->getType(), 1606 "passing") || 1607 PerformCopyInitialization(RHSExp, 1608 FnDecl->getParamDecl(1)->getType(), 1609 "passing")) 1610 return ExprError(); 1611 } 1612 1613 // Determine the result type 1614 QualType ResultTy 1615 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1616 ResultTy = ResultTy.getNonReferenceType(); 1617 1618 // Build the actual expression node. 1619 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1620 SourceLocation()); 1621 UsualUnaryConversions(FnExpr); 1622 1623 Base.release(); 1624 Idx.release(); 1625 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1626 FnExpr, Args, 2, 1627 ResultTy, LLoc)); 1628 } else { 1629 // We matched a built-in operator. Convert the arguments, then 1630 // break out so that we will build the appropriate built-in 1631 // operator node. 1632 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1633 "passing") || 1634 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1635 "passing")) 1636 return ExprError(); 1637 1638 break; 1639 } 1640 } 1641 1642 case OR_No_Viable_Function: 1643 // No viable function; fall through to handling this as a 1644 // built-in operator, which will produce an error message for us. 1645 break; 1646 1647 case OR_Ambiguous: 1648 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1649 << "[]" 1650 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1651 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1652 return ExprError(); 1653 1654 case OR_Deleted: 1655 Diag(LLoc, diag::err_ovl_deleted_oper) 1656 << Best->Function->isDeleted() 1657 << "[]" 1658 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1659 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1660 return ExprError(); 1661 } 1662 1663 // Either we found no viable overloaded operator or we matched a 1664 // built-in operator. In either case, fall through to trying to 1665 // build a built-in operation. 1666 } 1667 1668 // Perform default conversions. 1669 DefaultFunctionArrayConversion(LHSExp); 1670 DefaultFunctionArrayConversion(RHSExp); 1671 1672 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1673 1674 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1675 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1676 // in the subscript position. As a result, we need to derive the array base 1677 // and index from the expression types. 1678 Expr *BaseExpr, *IndexExpr; 1679 QualType ResultType; 1680 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1681 BaseExpr = LHSExp; 1682 IndexExpr = RHSExp; 1683 ResultType = Context.DependentTy; 1684 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1685 BaseExpr = LHSExp; 1686 IndexExpr = RHSExp; 1687 ResultType = PTy->getPointeeType(); 1688 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1689 // Handle the uncommon case of "123[Ptr]". 1690 BaseExpr = RHSExp; 1691 IndexExpr = LHSExp; 1692 ResultType = PTy->getPointeeType(); 1693 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1694 BaseExpr = LHSExp; // vectors: V[123] 1695 IndexExpr = RHSExp; 1696 1697 // FIXME: need to deal with const... 1698 ResultType = VTy->getElementType(); 1699 } else if (LHSTy->isArrayType()) { 1700 // If we see an array that wasn't promoted by 1701 // DefaultFunctionArrayConversion, it must be an array that 1702 // wasn't promoted because of the C90 rule that doesn't 1703 // allow promoting non-lvalue arrays. Warn, then 1704 // force the promotion here. 1705 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1706 LHSExp->getSourceRange(); 1707 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1708 LHSTy = LHSExp->getType(); 1709 1710 BaseExpr = LHSExp; 1711 IndexExpr = RHSExp; 1712 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1713 } else if (RHSTy->isArrayType()) { 1714 // Same as previous, except for 123[f().a] case 1715 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1716 RHSExp->getSourceRange(); 1717 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1718 RHSTy = RHSExp->getType(); 1719 1720 BaseExpr = RHSExp; 1721 IndexExpr = LHSExp; 1722 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1723 } else { 1724 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1725 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1726 } 1727 // C99 6.5.2.1p1 1728 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1729 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1730 << IndexExpr->getSourceRange()); 1731 1732 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1733 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1734 // type. Note that Functions are not objects, and that (in C99 parlance) 1735 // incomplete types are not object types. 1736 if (ResultType->isFunctionType()) { 1737 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1738 << ResultType << BaseExpr->getSourceRange(); 1739 return ExprError(); 1740 } 1741 1742 if (!ResultType->isDependentType() && 1743 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1744 BaseExpr->getSourceRange())) 1745 return ExprError(); 1746 1747 // Diagnose bad cases where we step over interface counts. 1748 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1749 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1750 << ResultType << BaseExpr->getSourceRange(); 1751 return ExprError(); 1752 } 1753 1754 Base.release(); 1755 Idx.release(); 1756 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1757 ResultType, RLoc)); 1758} 1759 1760QualType Sema:: 1761CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1762 IdentifierInfo &CompName, SourceLocation CompLoc) { 1763 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1764 1765 // The vector accessor can't exceed the number of elements. 1766 const char *compStr = CompName.getName(); 1767 1768 // This flag determines whether or not the component is one of the four 1769 // special names that indicate a subset of exactly half the elements are 1770 // to be selected. 1771 bool HalvingSwizzle = false; 1772 1773 // This flag determines whether or not CompName has an 's' char prefix, 1774 // indicating that it is a string of hex values to be used as vector indices. 1775 bool HexSwizzle = *compStr == 's'; 1776 1777 // Check that we've found one of the special components, or that the component 1778 // names must come from the same set. 1779 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1780 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1781 HalvingSwizzle = true; 1782 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1783 do 1784 compStr++; 1785 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1786 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1787 do 1788 compStr++; 1789 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1790 } 1791 1792 if (!HalvingSwizzle && *compStr) { 1793 // We didn't get to the end of the string. This means the component names 1794 // didn't come from the same set *or* we encountered an illegal name. 1795 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1796 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1797 return QualType(); 1798 } 1799 1800 // Ensure no component accessor exceeds the width of the vector type it 1801 // operates on. 1802 if (!HalvingSwizzle) { 1803 compStr = CompName.getName(); 1804 1805 if (HexSwizzle) 1806 compStr++; 1807 1808 while (*compStr) { 1809 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1810 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1811 << baseType << SourceRange(CompLoc); 1812 return QualType(); 1813 } 1814 } 1815 } 1816 1817 // If this is a halving swizzle, verify that the base type has an even 1818 // number of elements. 1819 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1820 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1821 << baseType << SourceRange(CompLoc); 1822 return QualType(); 1823 } 1824 1825 // The component accessor looks fine - now we need to compute the actual type. 1826 // The vector type is implied by the component accessor. For example, 1827 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1828 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1829 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1830 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1831 : CompName.getLength(); 1832 if (HexSwizzle) 1833 CompSize--; 1834 1835 if (CompSize == 1) 1836 return vecType->getElementType(); 1837 1838 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1839 // Now look up the TypeDefDecl from the vector type. Without this, 1840 // diagostics look bad. We want extended vector types to appear built-in. 1841 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1842 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1843 return Context.getTypedefType(ExtVectorDecls[i]); 1844 } 1845 return VT; // should never get here (a typedef type should always be found). 1846} 1847 1848static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1849 IdentifierInfo &Member, 1850 const Selector &Sel, 1851 ASTContext &Context) { 1852 1853 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1854 return PD; 1855 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1856 return OMD; 1857 1858 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1859 E = PDecl->protocol_end(); I != E; ++I) { 1860 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1861 Context)) 1862 return D; 1863 } 1864 return 0; 1865} 1866 1867static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1868 IdentifierInfo &Member, 1869 const Selector &Sel, 1870 ASTContext &Context) { 1871 // Check protocols on qualified interfaces. 1872 Decl *GDecl = 0; 1873 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1874 E = QIdTy->qual_end(); I != E; ++I) { 1875 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1876 GDecl = PD; 1877 break; 1878 } 1879 // Also must look for a getter name which uses property syntax. 1880 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1881 GDecl = OMD; 1882 break; 1883 } 1884 } 1885 if (!GDecl) { 1886 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1887 E = QIdTy->qual_end(); I != E; ++I) { 1888 // Search in the protocol-qualifier list of current protocol. 1889 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1890 if (GDecl) 1891 return GDecl; 1892 } 1893 } 1894 return GDecl; 1895} 1896 1897/// FindMethodInNestedImplementations - Look up a method in current and 1898/// all base class implementations. 1899/// 1900ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1901 const ObjCInterfaceDecl *IFace, 1902 const Selector &Sel) { 1903 ObjCMethodDecl *Method = 0; 1904 if (ObjCImplementationDecl *ImpDecl 1905 = LookupObjCImplementation(IFace->getIdentifier())) 1906 Method = ImpDecl->getInstanceMethod(Context, Sel); 1907 1908 if (!Method && IFace->getSuperClass()) 1909 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1910 return Method; 1911} 1912 1913Action::OwningExprResult 1914Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1915 tok::TokenKind OpKind, SourceLocation MemberLoc, 1916 IdentifierInfo &Member, 1917 DeclPtrTy ObjCImpDecl) { 1918 Expr *BaseExpr = Base.takeAs<Expr>(); 1919 assert(BaseExpr && "no record expression"); 1920 1921 // Perform default conversions. 1922 DefaultFunctionArrayConversion(BaseExpr); 1923 1924 QualType BaseType = BaseExpr->getType(); 1925 assert(!BaseType.isNull() && "no type for member expression"); 1926 1927 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1928 // must have pointer type, and the accessed type is the pointee. 1929 if (OpKind == tok::arrow) { 1930 if (const PointerType *PT = BaseType->getAsPointerType()) 1931 BaseType = PT->getPointeeType(); 1932 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1933 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1934 MemberLoc, Member)); 1935 else 1936 return ExprError(Diag(MemberLoc, 1937 diag::err_typecheck_member_reference_arrow) 1938 << BaseType << BaseExpr->getSourceRange()); 1939 } 1940 1941 // Handle field access to simple records. This also handles access to fields 1942 // of the ObjC 'id' struct. 1943 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1944 RecordDecl *RDecl = RTy->getDecl(); 1945 if (RequireCompleteType(OpLoc, BaseType, 1946 diag::err_typecheck_incomplete_tag, 1947 BaseExpr->getSourceRange())) 1948 return ExprError(); 1949 1950 // The record definition is complete, now make sure the member is valid. 1951 // FIXME: Qualified name lookup for C++ is a bit more complicated 1952 // than this. 1953 LookupResult Result 1954 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1955 LookupMemberName, false); 1956 1957 if (!Result) 1958 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1959 << &Member << BaseExpr->getSourceRange()); 1960 if (Result.isAmbiguous()) { 1961 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1962 MemberLoc, BaseExpr->getSourceRange()); 1963 return ExprError(); 1964 } 1965 1966 NamedDecl *MemberDecl = Result; 1967 1968 // If the decl being referenced had an error, return an error for this 1969 // sub-expr without emitting another error, in order to avoid cascading 1970 // error cases. 1971 if (MemberDecl->isInvalidDecl()) 1972 return ExprError(); 1973 1974 // Check the use of this field 1975 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1976 return ExprError(); 1977 1978 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1979 // We may have found a field within an anonymous union or struct 1980 // (C++ [class.union]). 1981 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1982 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1983 BaseExpr, OpLoc); 1984 1985 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1986 // FIXME: Handle address space modifiers 1987 QualType MemberType = FD->getType(); 1988 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1989 MemberType = Ref->getPointeeType(); 1990 else { 1991 unsigned combinedQualifiers = 1992 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1993 if (FD->isMutable()) 1994 combinedQualifiers &= ~QualType::Const; 1995 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1996 } 1997 1998 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1999 MemberLoc, MemberType)); 2000 } 2001 2002 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 2003 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2004 Var, MemberLoc, 2005 Var->getType().getNonReferenceType())); 2006 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 2007 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2008 MemberFn, MemberLoc, 2009 MemberFn->getType())); 2010 if (OverloadedFunctionDecl *Ovl 2011 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2012 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2013 MemberLoc, Context.OverloadTy)); 2014 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 2015 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2016 Enum, MemberLoc, Enum->getType())); 2017 if (isa<TypeDecl>(MemberDecl)) 2018 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2019 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2020 2021 // We found a declaration kind that we didn't expect. This is a 2022 // generic error message that tells the user that she can't refer 2023 // to this member with '.' or '->'. 2024 return ExprError(Diag(MemberLoc, 2025 diag::err_typecheck_member_reference_unknown) 2026 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2027 } 2028 2029 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2030 // (*Obj).ivar. 2031 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2032 ObjCInterfaceDecl *ClassDeclared; 2033 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2034 &Member, 2035 ClassDeclared)) { 2036 // If the decl being referenced had an error, return an error for this 2037 // sub-expr without emitting another error, in order to avoid cascading 2038 // error cases. 2039 if (IV->isInvalidDecl()) 2040 return ExprError(); 2041 2042 // Check whether we can reference this field. 2043 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2044 return ExprError(); 2045 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2046 IV->getAccessControl() != ObjCIvarDecl::Package) { 2047 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2048 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2049 ClassOfMethodDecl = MD->getClassInterface(); 2050 else if (ObjCImpDecl && getCurFunctionDecl()) { 2051 // Case of a c-function declared inside an objc implementation. 2052 // FIXME: For a c-style function nested inside an objc implementation 2053 // class, there is no implementation context available, so we pass down 2054 // the context as argument to this routine. Ideally, this context need 2055 // be passed down in the AST node and somehow calculated from the AST 2056 // for a function decl. 2057 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2058 if (ObjCImplementationDecl *IMPD = 2059 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2060 ClassOfMethodDecl = IMPD->getClassInterface(); 2061 else if (ObjCCategoryImplDecl* CatImplClass = 2062 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2063 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2064 } 2065 2066 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2067 if (ClassDeclared != IFTy->getDecl() || 2068 ClassOfMethodDecl != ClassDeclared) 2069 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2070 } 2071 // @protected 2072 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2073 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2074 } 2075 2076 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2077 MemberLoc, BaseExpr, 2078 OpKind == tok::arrow)); 2079 } 2080 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2081 << IFTy->getDecl()->getDeclName() << &Member 2082 << BaseExpr->getSourceRange()); 2083 } 2084 2085 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2086 // pointer to a (potentially qualified) interface type. 2087 const PointerType *PTy; 2088 const ObjCInterfaceType *IFTy; 2089 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2090 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2091 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2092 2093 // Search for a declared property first. 2094 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2095 &Member)) { 2096 // Check whether we can reference this property. 2097 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2098 return ExprError(); 2099 2100 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2101 MemberLoc, BaseExpr)); 2102 } 2103 2104 // Check protocols on qualified interfaces. 2105 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2106 E = IFTy->qual_end(); I != E; ++I) 2107 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2108 &Member)) { 2109 // Check whether we can reference this property. 2110 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2111 return ExprError(); 2112 2113 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2114 MemberLoc, BaseExpr)); 2115 } 2116 2117 // If that failed, look for an "implicit" property by seeing if the nullary 2118 // selector is implemented. 2119 2120 // FIXME: The logic for looking up nullary and unary selectors should be 2121 // shared with the code in ActOnInstanceMessage. 2122 2123 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2124 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2125 2126 // If this reference is in an @implementation, check for 'private' methods. 2127 if (!Getter) 2128 Getter = FindMethodInNestedImplementations(IFace, Sel); 2129 2130 // Look through local category implementations associated with the class. 2131 if (!Getter) { 2132 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2133 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2134 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2135 } 2136 } 2137 if (Getter) { 2138 // Check if we can reference this property. 2139 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2140 return ExprError(); 2141 } 2142 // If we found a getter then this may be a valid dot-reference, we 2143 // will look for the matching setter, in case it is needed. 2144 Selector SetterSel = 2145 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2146 PP.getSelectorTable(), &Member); 2147 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2148 if (!Setter) { 2149 // If this reference is in an @implementation, also check for 'private' 2150 // methods. 2151 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2152 } 2153 // Look through local category implementations associated with the class. 2154 if (!Setter) { 2155 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2156 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2157 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2158 } 2159 } 2160 2161 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2162 return ExprError(); 2163 2164 if (Getter || Setter) { 2165 QualType PType; 2166 2167 if (Getter) 2168 PType = Getter->getResultType(); 2169 else { 2170 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2171 E = Setter->param_end(); PI != E; ++PI) 2172 PType = (*PI)->getType(); 2173 } 2174 // FIXME: we must check that the setter has property type. 2175 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2176 Setter, MemberLoc, BaseExpr)); 2177 } 2178 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2179 << &Member << BaseType); 2180 } 2181 // Handle properties on qualified "id" protocols. 2182 const ObjCQualifiedIdType *QIdTy; 2183 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2184 // Check protocols on qualified interfaces. 2185 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2186 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2187 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2188 // Check the use of this declaration 2189 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2190 return ExprError(); 2191 2192 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2193 MemberLoc, BaseExpr)); 2194 } 2195 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2196 // Check the use of this method. 2197 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2198 return ExprError(); 2199 2200 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2201 OMD->getResultType(), 2202 OMD, OpLoc, MemberLoc, 2203 NULL, 0)); 2204 } 2205 } 2206 2207 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2208 << &Member << BaseType); 2209 } 2210 // Handle properties on ObjC 'Class' types. 2211 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2212 // Also must look for a getter name which uses property syntax. 2213 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2214 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2215 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2216 ObjCMethodDecl *Getter; 2217 // FIXME: need to also look locally in the implementation. 2218 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2219 // Check the use of this method. 2220 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2221 return ExprError(); 2222 } 2223 // If we found a getter then this may be a valid dot-reference, we 2224 // will look for the matching setter, in case it is needed. 2225 Selector SetterSel = 2226 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2227 PP.getSelectorTable(), &Member); 2228 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2229 if (!Setter) { 2230 // If this reference is in an @implementation, also check for 'private' 2231 // methods. 2232 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2233 } 2234 // Look through local category implementations associated with the class. 2235 if (!Setter) { 2236 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2237 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2238 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2239 } 2240 } 2241 2242 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2243 return ExprError(); 2244 2245 if (Getter || Setter) { 2246 QualType PType; 2247 2248 if (Getter) 2249 PType = Getter->getResultType(); 2250 else { 2251 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2252 E = Setter->param_end(); PI != E; ++PI) 2253 PType = (*PI)->getType(); 2254 } 2255 // FIXME: we must check that the setter has property type. 2256 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2257 Setter, MemberLoc, BaseExpr)); 2258 } 2259 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2260 << &Member << BaseType); 2261 } 2262 } 2263 2264 // Handle 'field access' to vectors, such as 'V.xx'. 2265 if (BaseType->isExtVectorType()) { 2266 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2267 if (ret.isNull()) 2268 return ExprError(); 2269 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2270 MemberLoc)); 2271 } 2272 2273 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2274 << BaseType << BaseExpr->getSourceRange(); 2275 2276 // If the user is trying to apply -> or . to a function or function 2277 // pointer, it's probably because they forgot parentheses to call 2278 // the function. Suggest the addition of those parentheses. 2279 if (BaseType == Context.OverloadTy || 2280 BaseType->isFunctionType() || 2281 (BaseType->isPointerType() && 2282 BaseType->getAsPointerType()->isFunctionType())) { 2283 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2284 Diag(Loc, diag::note_member_reference_needs_call) 2285 << CodeModificationHint::CreateInsertion(Loc, "()"); 2286 } 2287 2288 return ExprError(); 2289} 2290 2291/// ConvertArgumentsForCall - Converts the arguments specified in 2292/// Args/NumArgs to the parameter types of the function FDecl with 2293/// function prototype Proto. Call is the call expression itself, and 2294/// Fn is the function expression. For a C++ member function, this 2295/// routine does not attempt to convert the object argument. Returns 2296/// true if the call is ill-formed. 2297bool 2298Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2299 FunctionDecl *FDecl, 2300 const FunctionProtoType *Proto, 2301 Expr **Args, unsigned NumArgs, 2302 SourceLocation RParenLoc) { 2303 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2304 // assignment, to the types of the corresponding parameter, ... 2305 unsigned NumArgsInProto = Proto->getNumArgs(); 2306 unsigned NumArgsToCheck = NumArgs; 2307 bool Invalid = false; 2308 2309 // If too few arguments are available (and we don't have default 2310 // arguments for the remaining parameters), don't make the call. 2311 if (NumArgs < NumArgsInProto) { 2312 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2313 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2314 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2315 // Use default arguments for missing arguments 2316 NumArgsToCheck = NumArgsInProto; 2317 Call->setNumArgs(Context, NumArgsInProto); 2318 } 2319 2320 // If too many are passed and not variadic, error on the extras and drop 2321 // them. 2322 if (NumArgs > NumArgsInProto) { 2323 if (!Proto->isVariadic()) { 2324 Diag(Args[NumArgsInProto]->getLocStart(), 2325 diag::err_typecheck_call_too_many_args) 2326 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2327 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2328 Args[NumArgs-1]->getLocEnd()); 2329 // This deletes the extra arguments. 2330 Call->setNumArgs(Context, NumArgsInProto); 2331 Invalid = true; 2332 } 2333 NumArgsToCheck = NumArgsInProto; 2334 } 2335 2336 // Continue to check argument types (even if we have too few/many args). 2337 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2338 QualType ProtoArgType = Proto->getArgType(i); 2339 2340 Expr *Arg; 2341 if (i < NumArgs) { 2342 Arg = Args[i]; 2343 2344 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2345 ProtoArgType, 2346 diag::err_call_incomplete_argument, 2347 Arg->getSourceRange())) 2348 return true; 2349 2350 // Pass the argument. 2351 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2352 return true; 2353 } else 2354 // We already type-checked the argument, so we know it works. 2355 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2356 QualType ArgType = Arg->getType(); 2357 2358 Call->setArg(i, Arg); 2359 } 2360 2361 // If this is a variadic call, handle args passed through "...". 2362 if (Proto->isVariadic()) { 2363 VariadicCallType CallType = VariadicFunction; 2364 if (Fn->getType()->isBlockPointerType()) 2365 CallType = VariadicBlock; // Block 2366 else if (isa<MemberExpr>(Fn)) 2367 CallType = VariadicMethod; 2368 2369 // Promote the arguments (C99 6.5.2.2p7). 2370 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2371 Expr *Arg = Args[i]; 2372 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2373 Call->setArg(i, Arg); 2374 } 2375 } 2376 2377 return Invalid; 2378} 2379 2380/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2381/// This provides the location of the left/right parens and a list of comma 2382/// locations. 2383Action::OwningExprResult 2384Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2385 MultiExprArg args, 2386 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2387 unsigned NumArgs = args.size(); 2388 Expr *Fn = fn.takeAs<Expr>(); 2389 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2390 assert(Fn && "no function call expression"); 2391 FunctionDecl *FDecl = NULL; 2392 DeclarationName UnqualifiedName; 2393 2394 if (getLangOptions().CPlusPlus) { 2395 // Determine whether this is a dependent call inside a C++ template, 2396 // in which case we won't do any semantic analysis now. 2397 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2398 bool Dependent = false; 2399 if (Fn->isTypeDependent()) 2400 Dependent = true; 2401 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2402 Dependent = true; 2403 2404 if (Dependent) 2405 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2406 Context.DependentTy, RParenLoc)); 2407 2408 // Determine whether this is a call to an object (C++ [over.call.object]). 2409 if (Fn->getType()->isRecordType()) 2410 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2411 CommaLocs, RParenLoc)); 2412 2413 // Determine whether this is a call to a member function. 2414 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2415 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2416 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2417 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2418 CommaLocs, RParenLoc)); 2419 } 2420 2421 // If we're directly calling a function, get the appropriate declaration. 2422 DeclRefExpr *DRExpr = NULL; 2423 Expr *FnExpr = Fn; 2424 bool ADL = true; 2425 while (true) { 2426 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2427 FnExpr = IcExpr->getSubExpr(); 2428 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2429 // Parentheses around a function disable ADL 2430 // (C++0x [basic.lookup.argdep]p1). 2431 ADL = false; 2432 FnExpr = PExpr->getSubExpr(); 2433 } else if (isa<UnaryOperator>(FnExpr) && 2434 cast<UnaryOperator>(FnExpr)->getOpcode() 2435 == UnaryOperator::AddrOf) { 2436 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2437 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2438 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2439 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2440 break; 2441 } else if (UnresolvedFunctionNameExpr *DepName 2442 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2443 UnqualifiedName = DepName->getName(); 2444 break; 2445 } else { 2446 // Any kind of name that does not refer to a declaration (or 2447 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2448 ADL = false; 2449 break; 2450 } 2451 } 2452 2453 OverloadedFunctionDecl *Ovl = 0; 2454 if (DRExpr) { 2455 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2456 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2457 } 2458 2459 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2460 // We don't perform ADL for implicit declarations of builtins. 2461 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2462 ADL = false; 2463 2464 // We don't perform ADL in C. 2465 if (!getLangOptions().CPlusPlus) 2466 ADL = false; 2467 2468 if (Ovl || ADL) { 2469 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2470 UnqualifiedName, LParenLoc, Args, 2471 NumArgs, CommaLocs, RParenLoc, ADL); 2472 if (!FDecl) 2473 return ExprError(); 2474 2475 // Update Fn to refer to the actual function selected. 2476 Expr *NewFn = 0; 2477 if (QualifiedDeclRefExpr *QDRExpr 2478 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2479 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2480 QDRExpr->getLocation(), 2481 false, false, 2482 QDRExpr->getQualifierRange(), 2483 QDRExpr->getQualifier()); 2484 else 2485 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2486 Fn->getSourceRange().getBegin()); 2487 Fn->Destroy(Context); 2488 Fn = NewFn; 2489 } 2490 } 2491 2492 // Promote the function operand. 2493 UsualUnaryConversions(Fn); 2494 2495 // Make the call expr early, before semantic checks. This guarantees cleanup 2496 // of arguments and function on error. 2497 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2498 Args, NumArgs, 2499 Context.BoolTy, 2500 RParenLoc)); 2501 2502 const FunctionType *FuncT; 2503 if (!Fn->getType()->isBlockPointerType()) { 2504 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2505 // have type pointer to function". 2506 const PointerType *PT = Fn->getType()->getAsPointerType(); 2507 if (PT == 0) 2508 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2509 << Fn->getType() << Fn->getSourceRange()); 2510 FuncT = PT->getPointeeType()->getAsFunctionType(); 2511 } else { // This is a block call. 2512 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2513 getAsFunctionType(); 2514 } 2515 if (FuncT == 0) 2516 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2517 << Fn->getType() << Fn->getSourceRange()); 2518 2519 // Check for a valid return type 2520 if (!FuncT->getResultType()->isVoidType() && 2521 RequireCompleteType(Fn->getSourceRange().getBegin(), 2522 FuncT->getResultType(), 2523 diag::err_call_incomplete_return, 2524 TheCall->getSourceRange())) 2525 return ExprError(); 2526 2527 // We know the result type of the call, set it. 2528 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2529 2530 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2531 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2532 RParenLoc)) 2533 return ExprError(); 2534 } else { 2535 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2536 2537 if (FDecl) { 2538 // Check if we have too few/too many template arguments, based 2539 // on our knowledge of the function definition. 2540 const FunctionDecl *Def = 0; 2541 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) 2542 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2543 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2544 } 2545 2546 // Promote the arguments (C99 6.5.2.2p6). 2547 for (unsigned i = 0; i != NumArgs; i++) { 2548 Expr *Arg = Args[i]; 2549 DefaultArgumentPromotion(Arg); 2550 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2551 Arg->getType(), 2552 diag::err_call_incomplete_argument, 2553 Arg->getSourceRange())) 2554 return ExprError(); 2555 TheCall->setArg(i, Arg); 2556 } 2557 } 2558 2559 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2560 if (!Method->isStatic()) 2561 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2562 << Fn->getSourceRange()); 2563 2564 // Do special checking on direct calls to functions. 2565 if (FDecl) 2566 return CheckFunctionCall(FDecl, TheCall.take()); 2567 2568 return Owned(TheCall.take()); 2569} 2570 2571Action::OwningExprResult 2572Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2573 SourceLocation RParenLoc, ExprArg InitExpr) { 2574 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2575 QualType literalType = QualType::getFromOpaquePtr(Ty); 2576 // FIXME: put back this assert when initializers are worked out. 2577 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2578 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2579 2580 if (literalType->isArrayType()) { 2581 if (literalType->isVariableArrayType()) 2582 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2583 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2584 } else if (RequireCompleteType(LParenLoc, literalType, 2585 diag::err_typecheck_decl_incomplete_type, 2586 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2587 return ExprError(); 2588 2589 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2590 DeclarationName(), /*FIXME:DirectInit=*/false)) 2591 return ExprError(); 2592 2593 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2594 if (isFileScope) { // 6.5.2.5p3 2595 if (CheckForConstantInitializer(literalExpr, literalType)) 2596 return ExprError(); 2597 } 2598 InitExpr.release(); 2599 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2600 literalExpr, isFileScope)); 2601} 2602 2603Action::OwningExprResult 2604Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2605 SourceLocation RBraceLoc) { 2606 unsigned NumInit = initlist.size(); 2607 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2608 2609 // Semantic analysis for initializers is done by ActOnDeclarator() and 2610 // CheckInitializer() - it requires knowledge of the object being intialized. 2611 2612 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2613 RBraceLoc); 2614 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2615 return Owned(E); 2616} 2617 2618/// CheckCastTypes - Check type constraints for casting between types. 2619bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2620 UsualUnaryConversions(castExpr); 2621 2622 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2623 // type needs to be scalar. 2624 if (castType->isVoidType()) { 2625 // Cast to void allows any expr type. 2626 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2627 // We can't check any more until template instantiation time. 2628 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2629 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2630 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2631 (castType->isStructureType() || castType->isUnionType())) { 2632 // GCC struct/union extension: allow cast to self. 2633 // FIXME: Check that the cast destination type is complete. 2634 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2635 << castType << castExpr->getSourceRange(); 2636 } else if (castType->isUnionType()) { 2637 // GCC cast to union extension 2638 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2639 RecordDecl::field_iterator Field, FieldEnd; 2640 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2641 Field != FieldEnd; ++Field) { 2642 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2643 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2644 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2645 << castExpr->getSourceRange(); 2646 break; 2647 } 2648 } 2649 if (Field == FieldEnd) 2650 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2651 << castExpr->getType() << castExpr->getSourceRange(); 2652 } else { 2653 // Reject any other conversions to non-scalar types. 2654 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2655 << castType << castExpr->getSourceRange(); 2656 } 2657 } else if (!castExpr->getType()->isScalarType() && 2658 !castExpr->getType()->isVectorType()) { 2659 return Diag(castExpr->getLocStart(), 2660 diag::err_typecheck_expect_scalar_operand) 2661 << castExpr->getType() << castExpr->getSourceRange(); 2662 } else if (castExpr->getType()->isVectorType()) { 2663 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2664 return true; 2665 } else if (castType->isVectorType()) { 2666 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2667 return true; 2668 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2669 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2670 } else if (!castType->isArithmeticType()) { 2671 QualType castExprType = castExpr->getType(); 2672 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2673 return Diag(castExpr->getLocStart(), 2674 diag::err_cast_pointer_from_non_pointer_int) 2675 << castExprType << castExpr->getSourceRange(); 2676 } else if (!castExpr->getType()->isArithmeticType()) { 2677 if (!castType->isIntegralType() && castType->isArithmeticType()) 2678 return Diag(castExpr->getLocStart(), 2679 diag::err_cast_pointer_to_non_pointer_int) 2680 << castType << castExpr->getSourceRange(); 2681 } 2682 return false; 2683} 2684 2685bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2686 assert(VectorTy->isVectorType() && "Not a vector type!"); 2687 2688 if (Ty->isVectorType() || Ty->isIntegerType()) { 2689 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2690 return Diag(R.getBegin(), 2691 Ty->isVectorType() ? 2692 diag::err_invalid_conversion_between_vectors : 2693 diag::err_invalid_conversion_between_vector_and_integer) 2694 << VectorTy << Ty << R; 2695 } else 2696 return Diag(R.getBegin(), 2697 diag::err_invalid_conversion_between_vector_and_scalar) 2698 << VectorTy << Ty << R; 2699 2700 return false; 2701} 2702 2703Action::OwningExprResult 2704Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2705 SourceLocation RParenLoc, ExprArg Op) { 2706 assert((Ty != 0) && (Op.get() != 0) && 2707 "ActOnCastExpr(): missing type or expr"); 2708 2709 Expr *castExpr = Op.takeAs<Expr>(); 2710 QualType castType = QualType::getFromOpaquePtr(Ty); 2711 2712 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2713 return ExprError(); 2714 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2715 LParenLoc, RParenLoc)); 2716} 2717 2718/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2719/// In that case, lhs = cond. 2720/// C99 6.5.15 2721QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2722 SourceLocation QuestionLoc) { 2723 // C++ is sufficiently different to merit its own checker. 2724 if (getLangOptions().CPlusPlus) 2725 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2726 2727 UsualUnaryConversions(Cond); 2728 UsualUnaryConversions(LHS); 2729 UsualUnaryConversions(RHS); 2730 QualType CondTy = Cond->getType(); 2731 QualType LHSTy = LHS->getType(); 2732 QualType RHSTy = RHS->getType(); 2733 2734 // first, check the condition. 2735 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2736 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2737 << CondTy; 2738 return QualType(); 2739 } 2740 2741 // Now check the two expressions. 2742 2743 // If both operands have arithmetic type, do the usual arithmetic conversions 2744 // to find a common type: C99 6.5.15p3,5. 2745 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2746 UsualArithmeticConversions(LHS, RHS); 2747 return LHS->getType(); 2748 } 2749 2750 // If both operands are the same structure or union type, the result is that 2751 // type. 2752 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2753 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2754 if (LHSRT->getDecl() == RHSRT->getDecl()) 2755 // "If both the operands have structure or union type, the result has 2756 // that type." This implies that CV qualifiers are dropped. 2757 return LHSTy.getUnqualifiedType(); 2758 // FIXME: Type of conditional expression must be complete in C mode. 2759 } 2760 2761 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2762 // The following || allows only one side to be void (a GCC-ism). 2763 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2764 if (!LHSTy->isVoidType()) 2765 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2766 << RHS->getSourceRange(); 2767 if (!RHSTy->isVoidType()) 2768 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2769 << LHS->getSourceRange(); 2770 ImpCastExprToType(LHS, Context.VoidTy); 2771 ImpCastExprToType(RHS, Context.VoidTy); 2772 return Context.VoidTy; 2773 } 2774 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2775 // the type of the other operand." 2776 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2777 Context.isObjCObjectPointerType(LHSTy)) && 2778 RHS->isNullPointerConstant(Context)) { 2779 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2780 return LHSTy; 2781 } 2782 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2783 Context.isObjCObjectPointerType(RHSTy)) && 2784 LHS->isNullPointerConstant(Context)) { 2785 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2786 return RHSTy; 2787 } 2788 2789 // Handle the case where both operands are pointers before we handle null 2790 // pointer constants in case both operands are null pointer constants. 2791 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2792 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2793 // get the "pointed to" types 2794 QualType lhptee = LHSPT->getPointeeType(); 2795 QualType rhptee = RHSPT->getPointeeType(); 2796 2797 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2798 if (lhptee->isVoidType() && 2799 rhptee->isIncompleteOrObjectType()) { 2800 // Figure out necessary qualifiers (C99 6.5.15p6) 2801 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2802 QualType destType = Context.getPointerType(destPointee); 2803 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2804 ImpCastExprToType(RHS, destType); // promote to void* 2805 return destType; 2806 } 2807 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2808 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2809 QualType destType = Context.getPointerType(destPointee); 2810 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2811 ImpCastExprToType(RHS, destType); // promote to void* 2812 return destType; 2813 } 2814 2815 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2816 // Two identical pointer types are always compatible. 2817 return LHSTy; 2818 } 2819 2820 QualType compositeType = LHSTy; 2821 2822 // If either type is an Objective-C object type then check 2823 // compatibility according to Objective-C. 2824 if (Context.isObjCObjectPointerType(LHSTy) || 2825 Context.isObjCObjectPointerType(RHSTy)) { 2826 // If both operands are interfaces and either operand can be 2827 // assigned to the other, use that type as the composite 2828 // type. This allows 2829 // xxx ? (A*) a : (B*) b 2830 // where B is a subclass of A. 2831 // 2832 // Additionally, as for assignment, if either type is 'id' 2833 // allow silent coercion. Finally, if the types are 2834 // incompatible then make sure to use 'id' as the composite 2835 // type so the result is acceptable for sending messages to. 2836 2837 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2838 // It could return the composite type. 2839 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2840 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2841 if (LHSIface && RHSIface && 2842 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2843 compositeType = LHSTy; 2844 } else if (LHSIface && RHSIface && 2845 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2846 compositeType = RHSTy; 2847 } else if (Context.isObjCIdStructType(lhptee) || 2848 Context.isObjCIdStructType(rhptee)) { 2849 compositeType = Context.getObjCIdType(); 2850 } else { 2851 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2852 << LHSTy << RHSTy 2853 << LHS->getSourceRange() << RHS->getSourceRange(); 2854 QualType incompatTy = Context.getObjCIdType(); 2855 ImpCastExprToType(LHS, incompatTy); 2856 ImpCastExprToType(RHS, incompatTy); 2857 return incompatTy; 2858 } 2859 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2860 rhptee.getUnqualifiedType())) { 2861 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2862 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2863 // In this situation, we assume void* type. No especially good 2864 // reason, but this is what gcc does, and we do have to pick 2865 // to get a consistent AST. 2866 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2867 ImpCastExprToType(LHS, incompatTy); 2868 ImpCastExprToType(RHS, incompatTy); 2869 return incompatTy; 2870 } 2871 // The pointer types are compatible. 2872 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2873 // differently qualified versions of compatible types, the result type is 2874 // a pointer to an appropriately qualified version of the *composite* 2875 // type. 2876 // FIXME: Need to calculate the composite type. 2877 // FIXME: Need to add qualifiers 2878 ImpCastExprToType(LHS, compositeType); 2879 ImpCastExprToType(RHS, compositeType); 2880 return compositeType; 2881 } 2882 } 2883 2884 // GCC compatibility: soften pointer/integer mismatch. 2885 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 2886 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2887 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2888 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 2889 return RHSTy; 2890 } 2891 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 2892 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2893 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2894 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 2895 return LHSTy; 2896 } 2897 2898 // Selection between block pointer types is ok as long as they are the same. 2899 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2900 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2901 return LHSTy; 2902 2903 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2904 // evaluates to "struct objc_object *" (and is handled above when comparing 2905 // id with statically typed objects). 2906 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2907 // GCC allows qualified id and any Objective-C type to devolve to 2908 // id. Currently localizing to here until clear this should be 2909 // part of ObjCQualifiedIdTypesAreCompatible. 2910 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2911 (LHSTy->isObjCQualifiedIdType() && 2912 Context.isObjCObjectPointerType(RHSTy)) || 2913 (RHSTy->isObjCQualifiedIdType() && 2914 Context.isObjCObjectPointerType(LHSTy))) { 2915 // FIXME: This is not the correct composite type. This only 2916 // happens to work because id can more or less be used anywhere, 2917 // however this may change the type of method sends. 2918 // FIXME: gcc adds some type-checking of the arguments and emits 2919 // (confusing) incompatible comparison warnings in some 2920 // cases. Investigate. 2921 QualType compositeType = Context.getObjCIdType(); 2922 ImpCastExprToType(LHS, compositeType); 2923 ImpCastExprToType(RHS, compositeType); 2924 return compositeType; 2925 } 2926 } 2927 2928 // Otherwise, the operands are not compatible. 2929 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2930 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2931 return QualType(); 2932} 2933 2934/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2935/// in the case of a the GNU conditional expr extension. 2936Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2937 SourceLocation ColonLoc, 2938 ExprArg Cond, ExprArg LHS, 2939 ExprArg RHS) { 2940 Expr *CondExpr = (Expr *) Cond.get(); 2941 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2942 2943 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2944 // was the condition. 2945 bool isLHSNull = LHSExpr == 0; 2946 if (isLHSNull) 2947 LHSExpr = CondExpr; 2948 2949 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2950 RHSExpr, QuestionLoc); 2951 if (result.isNull()) 2952 return ExprError(); 2953 2954 Cond.release(); 2955 LHS.release(); 2956 RHS.release(); 2957 return Owned(new (Context) ConditionalOperator(CondExpr, 2958 isLHSNull ? 0 : LHSExpr, 2959 RHSExpr, result)); 2960} 2961 2962 2963// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2964// being closely modeled after the C99 spec:-). The odd characteristic of this 2965// routine is it effectively iqnores the qualifiers on the top level pointee. 2966// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2967// FIXME: add a couple examples in this comment. 2968Sema::AssignConvertType 2969Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2970 QualType lhptee, rhptee; 2971 2972 // get the "pointed to" type (ignoring qualifiers at the top level) 2973 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2974 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2975 2976 // make sure we operate on the canonical type 2977 lhptee = Context.getCanonicalType(lhptee); 2978 rhptee = Context.getCanonicalType(rhptee); 2979 2980 AssignConvertType ConvTy = Compatible; 2981 2982 // C99 6.5.16.1p1: This following citation is common to constraints 2983 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2984 // qualifiers of the type *pointed to* by the right; 2985 // FIXME: Handle ExtQualType 2986 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2987 ConvTy = CompatiblePointerDiscardsQualifiers; 2988 2989 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2990 // incomplete type and the other is a pointer to a qualified or unqualified 2991 // version of void... 2992 if (lhptee->isVoidType()) { 2993 if (rhptee->isIncompleteOrObjectType()) 2994 return ConvTy; 2995 2996 // As an extension, we allow cast to/from void* to function pointer. 2997 assert(rhptee->isFunctionType()); 2998 return FunctionVoidPointer; 2999 } 3000 3001 if (rhptee->isVoidType()) { 3002 if (lhptee->isIncompleteOrObjectType()) 3003 return ConvTy; 3004 3005 // As an extension, we allow cast to/from void* to function pointer. 3006 assert(lhptee->isFunctionType()); 3007 return FunctionVoidPointer; 3008 } 3009 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3010 // unqualified versions of compatible types, ... 3011 lhptee = lhptee.getUnqualifiedType(); 3012 rhptee = rhptee.getUnqualifiedType(); 3013 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3014 // Check if the pointee types are compatible ignoring the sign. 3015 // We explicitly check for char so that we catch "char" vs 3016 // "unsigned char" on systems where "char" is unsigned. 3017 if (lhptee->isCharType()) { 3018 lhptee = Context.UnsignedCharTy; 3019 } else if (lhptee->isSignedIntegerType()) { 3020 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3021 } 3022 if (rhptee->isCharType()) { 3023 rhptee = Context.UnsignedCharTy; 3024 } else if (rhptee->isSignedIntegerType()) { 3025 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3026 } 3027 if (lhptee == rhptee) { 3028 // Types are compatible ignoring the sign. Qualifier incompatibility 3029 // takes priority over sign incompatibility because the sign 3030 // warning can be disabled. 3031 if (ConvTy != Compatible) 3032 return ConvTy; 3033 return IncompatiblePointerSign; 3034 } 3035 // General pointer incompatibility takes priority over qualifiers. 3036 return IncompatiblePointer; 3037 } 3038 return ConvTy; 3039} 3040 3041/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3042/// block pointer types are compatible or whether a block and normal pointer 3043/// are compatible. It is more restrict than comparing two function pointer 3044// types. 3045Sema::AssignConvertType 3046Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3047 QualType rhsType) { 3048 QualType lhptee, rhptee; 3049 3050 // get the "pointed to" type (ignoring qualifiers at the top level) 3051 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3052 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3053 3054 // make sure we operate on the canonical type 3055 lhptee = Context.getCanonicalType(lhptee); 3056 rhptee = Context.getCanonicalType(rhptee); 3057 3058 AssignConvertType ConvTy = Compatible; 3059 3060 // For blocks we enforce that qualifiers are identical. 3061 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3062 ConvTy = CompatiblePointerDiscardsQualifiers; 3063 3064 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 3065 return IncompatibleBlockPointer; 3066 return ConvTy; 3067} 3068 3069/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3070/// has code to accommodate several GCC extensions when type checking 3071/// pointers. Here are some objectionable examples that GCC considers warnings: 3072/// 3073/// int a, *pint; 3074/// short *pshort; 3075/// struct foo *pfoo; 3076/// 3077/// pint = pshort; // warning: assignment from incompatible pointer type 3078/// a = pint; // warning: assignment makes integer from pointer without a cast 3079/// pint = a; // warning: assignment makes pointer from integer without a cast 3080/// pint = pfoo; // warning: assignment from incompatible pointer type 3081/// 3082/// As a result, the code for dealing with pointers is more complex than the 3083/// C99 spec dictates. 3084/// 3085Sema::AssignConvertType 3086Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3087 // Get canonical types. We're not formatting these types, just comparing 3088 // them. 3089 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3090 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3091 3092 if (lhsType == rhsType) 3093 return Compatible; // Common case: fast path an exact match. 3094 3095 // If the left-hand side is a reference type, then we are in a 3096 // (rare!) case where we've allowed the use of references in C, 3097 // e.g., as a parameter type in a built-in function. In this case, 3098 // just make sure that the type referenced is compatible with the 3099 // right-hand side type. The caller is responsible for adjusting 3100 // lhsType so that the resulting expression does not have reference 3101 // type. 3102 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3103 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3104 return Compatible; 3105 return Incompatible; 3106 } 3107 3108 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3109 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3110 return Compatible; 3111 // Relax integer conversions like we do for pointers below. 3112 if (rhsType->isIntegerType()) 3113 return IntToPointer; 3114 if (lhsType->isIntegerType()) 3115 return PointerToInt; 3116 return IncompatibleObjCQualifiedId; 3117 } 3118 3119 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3120 // For ExtVector, allow vector splats; float -> <n x float> 3121 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3122 if (LV->getElementType() == rhsType) 3123 return Compatible; 3124 3125 // If we are allowing lax vector conversions, and LHS and RHS are both 3126 // vectors, the total size only needs to be the same. This is a bitcast; 3127 // no bits are changed but the result type is different. 3128 if (getLangOptions().LaxVectorConversions && 3129 lhsType->isVectorType() && rhsType->isVectorType()) { 3130 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3131 return IncompatibleVectors; 3132 } 3133 return Incompatible; 3134 } 3135 3136 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3137 return Compatible; 3138 3139 if (isa<PointerType>(lhsType)) { 3140 if (rhsType->isIntegerType()) 3141 return IntToPointer; 3142 3143 if (isa<PointerType>(rhsType)) 3144 return CheckPointerTypesForAssignment(lhsType, rhsType); 3145 3146 if (rhsType->getAsBlockPointerType()) { 3147 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3148 return Compatible; 3149 3150 // Treat block pointers as objects. 3151 if (getLangOptions().ObjC1 && 3152 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3153 return Compatible; 3154 } 3155 return Incompatible; 3156 } 3157 3158 if (isa<BlockPointerType>(lhsType)) { 3159 if (rhsType->isIntegerType()) 3160 return IntToBlockPointer; 3161 3162 // Treat block pointers as objects. 3163 if (getLangOptions().ObjC1 && 3164 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3165 return Compatible; 3166 3167 if (rhsType->isBlockPointerType()) 3168 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3169 3170 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3171 if (RHSPT->getPointeeType()->isVoidType()) 3172 return Compatible; 3173 } 3174 return Incompatible; 3175 } 3176 3177 if (isa<PointerType>(rhsType)) { 3178 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3179 if (lhsType == Context.BoolTy) 3180 return Compatible; 3181 3182 if (lhsType->isIntegerType()) 3183 return PointerToInt; 3184 3185 if (isa<PointerType>(lhsType)) 3186 return CheckPointerTypesForAssignment(lhsType, rhsType); 3187 3188 if (isa<BlockPointerType>(lhsType) && 3189 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3190 return Compatible; 3191 return Incompatible; 3192 } 3193 3194 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3195 if (Context.typesAreCompatible(lhsType, rhsType)) 3196 return Compatible; 3197 } 3198 return Incompatible; 3199} 3200 3201/// \brief Constructs a transparent union from an expression that is 3202/// used to initialize the transparent union. 3203static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3204 QualType UnionType, FieldDecl *Field) { 3205 // Build an initializer list that designates the appropriate member 3206 // of the transparent union. 3207 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3208 &E, 1, 3209 SourceLocation()); 3210 Initializer->setType(UnionType); 3211 Initializer->setInitializedFieldInUnion(Field); 3212 3213 // Build a compound literal constructing a value of the transparent 3214 // union type from this initializer list. 3215 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3216 false); 3217} 3218 3219Sema::AssignConvertType 3220Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3221 QualType FromType = rExpr->getType(); 3222 3223 // If the ArgType is a Union type, we want to handle a potential 3224 // transparent_union GCC extension. 3225 const RecordType *UT = ArgType->getAsUnionType(); 3226 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3227 return Incompatible; 3228 3229 // The field to initialize within the transparent union. 3230 RecordDecl *UD = UT->getDecl(); 3231 FieldDecl *InitField = 0; 3232 // It's compatible if the expression matches any of the fields. 3233 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3234 itend = UD->field_end(Context); 3235 it != itend; ++it) { 3236 if (it->getType()->isPointerType()) { 3237 // If the transparent union contains a pointer type, we allow: 3238 // 1) void pointer 3239 // 2) null pointer constant 3240 if (FromType->isPointerType()) 3241 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3242 ImpCastExprToType(rExpr, it->getType()); 3243 InitField = *it; 3244 break; 3245 } 3246 3247 if (rExpr->isNullPointerConstant(Context)) { 3248 ImpCastExprToType(rExpr, it->getType()); 3249 InitField = *it; 3250 break; 3251 } 3252 } 3253 3254 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3255 == Compatible) { 3256 InitField = *it; 3257 break; 3258 } 3259 } 3260 3261 if (!InitField) 3262 return Incompatible; 3263 3264 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3265 return Compatible; 3266} 3267 3268Sema::AssignConvertType 3269Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3270 if (getLangOptions().CPlusPlus) { 3271 if (!lhsType->isRecordType()) { 3272 // C++ 5.17p3: If the left operand is not of class type, the 3273 // expression is implicitly converted (C++ 4) to the 3274 // cv-unqualified type of the left operand. 3275 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3276 "assigning")) 3277 return Incompatible; 3278 return Compatible; 3279 } 3280 3281 // FIXME: Currently, we fall through and treat C++ classes like C 3282 // structures. 3283 } 3284 3285 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3286 // a null pointer constant. 3287 if ((lhsType->isPointerType() || 3288 lhsType->isObjCQualifiedIdType() || 3289 lhsType->isBlockPointerType()) 3290 && rExpr->isNullPointerConstant(Context)) { 3291 ImpCastExprToType(rExpr, lhsType); 3292 return Compatible; 3293 } 3294 3295 // This check seems unnatural, however it is necessary to ensure the proper 3296 // conversion of functions/arrays. If the conversion were done for all 3297 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3298 // expressions that surpress this implicit conversion (&, sizeof). 3299 // 3300 // Suppress this for references: C++ 8.5.3p5. 3301 if (!lhsType->isReferenceType()) 3302 DefaultFunctionArrayConversion(rExpr); 3303 3304 Sema::AssignConvertType result = 3305 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3306 3307 // C99 6.5.16.1p2: The value of the right operand is converted to the 3308 // type of the assignment expression. 3309 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3310 // so that we can use references in built-in functions even in C. 3311 // The getNonReferenceType() call makes sure that the resulting expression 3312 // does not have reference type. 3313 if (result != Incompatible && rExpr->getType() != lhsType) 3314 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3315 return result; 3316} 3317 3318Sema::AssignConvertType 3319Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3320 return CheckAssignmentConstraints(lhsType, rhsType); 3321} 3322 3323QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3324 Diag(Loc, diag::err_typecheck_invalid_operands) 3325 << lex->getType() << rex->getType() 3326 << lex->getSourceRange() << rex->getSourceRange(); 3327 return QualType(); 3328} 3329 3330inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3331 Expr *&rex) { 3332 // For conversion purposes, we ignore any qualifiers. 3333 // For example, "const float" and "float" are equivalent. 3334 QualType lhsType = 3335 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3336 QualType rhsType = 3337 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3338 3339 // If the vector types are identical, return. 3340 if (lhsType == rhsType) 3341 return lhsType; 3342 3343 // Handle the case of a vector & extvector type of the same size and element 3344 // type. It would be nice if we only had one vector type someday. 3345 if (getLangOptions().LaxVectorConversions) { 3346 // FIXME: Should we warn here? 3347 if (const VectorType *LV = lhsType->getAsVectorType()) { 3348 if (const VectorType *RV = rhsType->getAsVectorType()) 3349 if (LV->getElementType() == RV->getElementType() && 3350 LV->getNumElements() == RV->getNumElements()) { 3351 return lhsType->isExtVectorType() ? lhsType : rhsType; 3352 } 3353 } 3354 } 3355 3356 // If the lhs is an extended vector and the rhs is a scalar of the same type 3357 // or a literal, promote the rhs to the vector type. 3358 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3359 QualType eltType = V->getElementType(); 3360 3361 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3362 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3363 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3364 ImpCastExprToType(rex, lhsType); 3365 return lhsType; 3366 } 3367 } 3368 3369 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3370 // promote the lhs to the vector type. 3371 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3372 QualType eltType = V->getElementType(); 3373 3374 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3375 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3376 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3377 ImpCastExprToType(lex, rhsType); 3378 return rhsType; 3379 } 3380 } 3381 3382 // You cannot convert between vector values of different size. 3383 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3384 << lex->getType() << rex->getType() 3385 << lex->getSourceRange() << rex->getSourceRange(); 3386 return QualType(); 3387} 3388 3389inline QualType Sema::CheckMultiplyDivideOperands( 3390 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3391{ 3392 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3393 return CheckVectorOperands(Loc, lex, rex); 3394 3395 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3396 3397 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3398 return compType; 3399 return InvalidOperands(Loc, lex, rex); 3400} 3401 3402inline QualType Sema::CheckRemainderOperands( 3403 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3404{ 3405 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3406 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3407 return CheckVectorOperands(Loc, lex, rex); 3408 return InvalidOperands(Loc, lex, rex); 3409 } 3410 3411 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3412 3413 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3414 return compType; 3415 return InvalidOperands(Loc, lex, rex); 3416} 3417 3418inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3419 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3420{ 3421 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3422 QualType compType = CheckVectorOperands(Loc, lex, rex); 3423 if (CompLHSTy) *CompLHSTy = compType; 3424 return compType; 3425 } 3426 3427 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3428 3429 // handle the common case first (both operands are arithmetic). 3430 if (lex->getType()->isArithmeticType() && 3431 rex->getType()->isArithmeticType()) { 3432 if (CompLHSTy) *CompLHSTy = compType; 3433 return compType; 3434 } 3435 3436 // Put any potential pointer into PExp 3437 Expr* PExp = lex, *IExp = rex; 3438 if (IExp->getType()->isPointerType()) 3439 std::swap(PExp, IExp); 3440 3441 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3442 if (IExp->getType()->isIntegerType()) { 3443 QualType PointeeTy = PTy->getPointeeType(); 3444 // Check for arithmetic on pointers to incomplete types. 3445 if (PointeeTy->isVoidType()) { 3446 if (getLangOptions().CPlusPlus) { 3447 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3448 << lex->getSourceRange() << rex->getSourceRange(); 3449 return QualType(); 3450 } 3451 3452 // GNU extension: arithmetic on pointer to void 3453 Diag(Loc, diag::ext_gnu_void_ptr) 3454 << lex->getSourceRange() << rex->getSourceRange(); 3455 } else if (PointeeTy->isFunctionType()) { 3456 if (getLangOptions().CPlusPlus) { 3457 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3458 << lex->getType() << lex->getSourceRange(); 3459 return QualType(); 3460 } 3461 3462 // GNU extension: arithmetic on pointer to function 3463 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3464 << lex->getType() << lex->getSourceRange(); 3465 } else if (!PTy->isDependentType() && 3466 RequireCompleteType(Loc, PointeeTy, 3467 diag::err_typecheck_arithmetic_incomplete_type, 3468 PExp->getSourceRange(), SourceRange(), 3469 PExp->getType())) 3470 return QualType(); 3471 3472 // Diagnose bad cases where we step over interface counts. 3473 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3474 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3475 << PointeeTy << PExp->getSourceRange(); 3476 return QualType(); 3477 } 3478 3479 if (CompLHSTy) { 3480 QualType LHSTy = lex->getType(); 3481 if (LHSTy->isPromotableIntegerType()) 3482 LHSTy = Context.IntTy; 3483 else { 3484 QualType T = isPromotableBitField(lex, Context); 3485 if (!T.isNull()) 3486 LHSTy = T; 3487 } 3488 3489 *CompLHSTy = LHSTy; 3490 } 3491 return PExp->getType(); 3492 } 3493 } 3494 3495 return InvalidOperands(Loc, lex, rex); 3496} 3497 3498// C99 6.5.6 3499QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3500 SourceLocation Loc, QualType* CompLHSTy) { 3501 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3502 QualType compType = CheckVectorOperands(Loc, lex, rex); 3503 if (CompLHSTy) *CompLHSTy = compType; 3504 return compType; 3505 } 3506 3507 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3508 3509 // Enforce type constraints: C99 6.5.6p3. 3510 3511 // Handle the common case first (both operands are arithmetic). 3512 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) { 3513 if (CompLHSTy) *CompLHSTy = compType; 3514 return compType; 3515 } 3516 3517 // Either ptr - int or ptr - ptr. 3518 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3519 QualType lpointee = LHSPTy->getPointeeType(); 3520 3521 // The LHS must be an completely-defined object type. 3522 3523 bool ComplainAboutVoid = false; 3524 Expr *ComplainAboutFunc = 0; 3525 if (lpointee->isVoidType()) { 3526 if (getLangOptions().CPlusPlus) { 3527 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3528 << lex->getSourceRange() << rex->getSourceRange(); 3529 return QualType(); 3530 } 3531 3532 // GNU C extension: arithmetic on pointer to void 3533 ComplainAboutVoid = true; 3534 } else if (lpointee->isFunctionType()) { 3535 if (getLangOptions().CPlusPlus) { 3536 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3537 << lex->getType() << lex->getSourceRange(); 3538 return QualType(); 3539 } 3540 3541 // GNU C extension: arithmetic on pointer to function 3542 ComplainAboutFunc = lex; 3543 } else if (!lpointee->isDependentType() && 3544 RequireCompleteType(Loc, lpointee, 3545 diag::err_typecheck_sub_ptr_object, 3546 lex->getSourceRange(), 3547 SourceRange(), 3548 lex->getType())) 3549 return QualType(); 3550 3551 // Diagnose bad cases where we step over interface counts. 3552 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3553 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3554 << lpointee << lex->getSourceRange(); 3555 return QualType(); 3556 } 3557 3558 // The result type of a pointer-int computation is the pointer type. 3559 if (rex->getType()->isIntegerType()) { 3560 if (ComplainAboutVoid) 3561 Diag(Loc, diag::ext_gnu_void_ptr) 3562 << lex->getSourceRange() << rex->getSourceRange(); 3563 if (ComplainAboutFunc) 3564 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3565 << ComplainAboutFunc->getType() 3566 << ComplainAboutFunc->getSourceRange(); 3567 3568 if (CompLHSTy) *CompLHSTy = lex->getType(); 3569 return lex->getType(); 3570 } 3571 3572 // Handle pointer-pointer subtractions. 3573 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3574 QualType rpointee = RHSPTy->getPointeeType(); 3575 3576 // RHS must be a completely-type object type. 3577 // Handle the GNU void* extension. 3578 if (rpointee->isVoidType()) { 3579 if (getLangOptions().CPlusPlus) { 3580 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3581 << lex->getSourceRange() << rex->getSourceRange(); 3582 return QualType(); 3583 } 3584 3585 ComplainAboutVoid = true; 3586 } else if (rpointee->isFunctionType()) { 3587 if (getLangOptions().CPlusPlus) { 3588 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3589 << rex->getType() << rex->getSourceRange(); 3590 return QualType(); 3591 } 3592 3593 // GNU extension: arithmetic on pointer to function 3594 if (!ComplainAboutFunc) 3595 ComplainAboutFunc = rex; 3596 } else if (!rpointee->isDependentType() && 3597 RequireCompleteType(Loc, rpointee, 3598 diag::err_typecheck_sub_ptr_object, 3599 rex->getSourceRange(), 3600 SourceRange(), 3601 rex->getType())) 3602 return QualType(); 3603 3604 // Pointee types must be compatible. 3605 if (!Context.typesAreCompatible( 3606 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3607 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3608 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3609 << lex->getType() << rex->getType() 3610 << lex->getSourceRange() << rex->getSourceRange(); 3611 return QualType(); 3612 } 3613 3614 if (ComplainAboutVoid) 3615 Diag(Loc, diag::ext_gnu_void_ptr) 3616 << lex->getSourceRange() << rex->getSourceRange(); 3617 if (ComplainAboutFunc) 3618 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3619 << ComplainAboutFunc->getType() 3620 << ComplainAboutFunc->getSourceRange(); 3621 3622 if (CompLHSTy) *CompLHSTy = lex->getType(); 3623 return Context.getPointerDiffType(); 3624 } 3625 } 3626 3627 return InvalidOperands(Loc, lex, rex); 3628} 3629 3630// C99 6.5.7 3631QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3632 bool isCompAssign) { 3633 // C99 6.5.7p2: Each of the operands shall have integer type. 3634 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3635 return InvalidOperands(Loc, lex, rex); 3636 3637 // Shifts don't perform usual arithmetic conversions, they just do integer 3638 // promotions on each operand. C99 6.5.7p3 3639 QualType LHSTy; 3640 if (lex->getType()->isPromotableIntegerType()) 3641 LHSTy = Context.IntTy; 3642 else { 3643 LHSTy = isPromotableBitField(lex, Context); 3644 if (LHSTy.isNull()) 3645 LHSTy = lex->getType(); 3646 } 3647 if (!isCompAssign) 3648 ImpCastExprToType(lex, LHSTy); 3649 3650 UsualUnaryConversions(rex); 3651 3652 // "The type of the result is that of the promoted left operand." 3653 return LHSTy; 3654} 3655 3656// C99 6.5.8 3657QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3658 unsigned OpaqueOpc, bool isRelational) { 3659 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3660 3661 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3662 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3663 3664 // C99 6.5.8p3 / C99 6.5.9p4 3665 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3666 UsualArithmeticConversions(lex, rex); 3667 else { 3668 UsualUnaryConversions(lex); 3669 UsualUnaryConversions(rex); 3670 } 3671 QualType lType = lex->getType(); 3672 QualType rType = rex->getType(); 3673 3674 if (!lType->isFloatingType()) { 3675 // For non-floating point types, check for self-comparisons of the form 3676 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3677 // often indicate logic errors in the program. 3678 // NOTE: Don't warn about comparisons of enum constants. These can arise 3679 // from macro expansions, and are usually quite deliberate. 3680 Expr *LHSStripped = lex->IgnoreParens(); 3681 Expr *RHSStripped = rex->IgnoreParens(); 3682 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3683 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3684 if (DRL->getDecl() == DRR->getDecl() && 3685 !isa<EnumConstantDecl>(DRL->getDecl())) 3686 Diag(Loc, diag::warn_selfcomparison); 3687 3688 if (isa<CastExpr>(LHSStripped)) 3689 LHSStripped = LHSStripped->IgnoreParenCasts(); 3690 if (isa<CastExpr>(RHSStripped)) 3691 RHSStripped = RHSStripped->IgnoreParenCasts(); 3692 3693 // Warn about comparisons against a string constant (unless the other 3694 // operand is null), the user probably wants strcmp. 3695 Expr *literalString = 0; 3696 Expr *literalStringStripped = 0; 3697 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3698 !RHSStripped->isNullPointerConstant(Context)) { 3699 literalString = lex; 3700 literalStringStripped = LHSStripped; 3701 } 3702 else if ((isa<StringLiteral>(RHSStripped) || 3703 isa<ObjCEncodeExpr>(RHSStripped)) && 3704 !LHSStripped->isNullPointerConstant(Context)) { 3705 literalString = rex; 3706 literalStringStripped = RHSStripped; 3707 } 3708 3709 if (literalString) { 3710 std::string resultComparison; 3711 switch (Opc) { 3712 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3713 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3714 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3715 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3716 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3717 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3718 default: assert(false && "Invalid comparison operator"); 3719 } 3720 Diag(Loc, diag::warn_stringcompare) 3721 << isa<ObjCEncodeExpr>(literalStringStripped) 3722 << literalString->getSourceRange() 3723 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3724 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3725 "strcmp(") 3726 << CodeModificationHint::CreateInsertion( 3727 PP.getLocForEndOfToken(rex->getLocEnd()), 3728 resultComparison); 3729 } 3730 } 3731 3732 // The result of comparisons is 'bool' in C++, 'int' in C. 3733 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3734 3735 if (isRelational) { 3736 if (lType->isRealType() && rType->isRealType()) 3737 return ResultTy; 3738 } else { 3739 // Check for comparisons of floating point operands using != and ==. 3740 if (lType->isFloatingType()) { 3741 assert(rType->isFloatingType()); 3742 CheckFloatComparison(Loc,lex,rex); 3743 } 3744 3745 if (lType->isArithmeticType() && rType->isArithmeticType()) 3746 return ResultTy; 3747 } 3748 3749 bool LHSIsNull = lex->isNullPointerConstant(Context); 3750 bool RHSIsNull = rex->isNullPointerConstant(Context); 3751 3752 // All of the following pointer related warnings are GCC extensions, except 3753 // when handling null pointer constants. One day, we can consider making them 3754 // errors (when -pedantic-errors is enabled). 3755 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3756 QualType LCanPointeeTy = 3757 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3758 QualType RCanPointeeTy = 3759 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3760 3761 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3762 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3763 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3764 RCanPointeeTy.getUnqualifiedType()) && 3765 !Context.areComparableObjCPointerTypes(lType, rType)) { 3766 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3767 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3768 } 3769 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3770 return ResultTy; 3771 } 3772 // Handle block pointer types. 3773 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3774 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3775 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3776 3777 if (!LHSIsNull && !RHSIsNull && 3778 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3779 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3780 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3781 } 3782 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3783 return ResultTy; 3784 } 3785 // Allow block pointers to be compared with null pointer constants. 3786 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3787 (lType->isPointerType() && rType->isBlockPointerType())) { 3788 if (!LHSIsNull && !RHSIsNull) { 3789 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3790 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3791 } 3792 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3793 return ResultTy; 3794 } 3795 3796 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3797 if (lType->isPointerType() || rType->isPointerType()) { 3798 const PointerType *LPT = lType->getAsPointerType(); 3799 const PointerType *RPT = rType->getAsPointerType(); 3800 bool LPtrToVoid = LPT ? 3801 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3802 bool RPtrToVoid = RPT ? 3803 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3804 3805 if (!LPtrToVoid && !RPtrToVoid && 3806 !Context.typesAreCompatible(lType, rType)) { 3807 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3808 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3809 ImpCastExprToType(rex, lType); 3810 return ResultTy; 3811 } 3812 ImpCastExprToType(rex, lType); 3813 return ResultTy; 3814 } 3815 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3816 ImpCastExprToType(rex, lType); 3817 return ResultTy; 3818 } else { 3819 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3820 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3821 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3822 ImpCastExprToType(rex, lType); 3823 return ResultTy; 3824 } 3825 } 3826 } 3827 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3828 rType->isIntegerType()) { 3829 if (!RHSIsNull) 3830 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3831 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3832 ImpCastExprToType(rex, lType); // promote the integer to pointer 3833 return ResultTy; 3834 } 3835 if (lType->isIntegerType() && 3836 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3837 if (!LHSIsNull) 3838 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3839 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3840 ImpCastExprToType(lex, rType); // promote the integer to pointer 3841 return ResultTy; 3842 } 3843 // Handle block pointers. 3844 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3845 if (!RHSIsNull) 3846 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3847 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3848 ImpCastExprToType(rex, lType); // promote the integer to pointer 3849 return ResultTy; 3850 } 3851 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3852 if (!LHSIsNull) 3853 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3854 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3855 ImpCastExprToType(lex, rType); // promote the integer to pointer 3856 return ResultTy; 3857 } 3858 return InvalidOperands(Loc, lex, rex); 3859} 3860 3861/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3862/// operates on extended vector types. Instead of producing an IntTy result, 3863/// like a scalar comparison, a vector comparison produces a vector of integer 3864/// types. 3865QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3866 SourceLocation Loc, 3867 bool isRelational) { 3868 // Check to make sure we're operating on vectors of the same type and width, 3869 // Allowing one side to be a scalar of element type. 3870 QualType vType = CheckVectorOperands(Loc, lex, rex); 3871 if (vType.isNull()) 3872 return vType; 3873 3874 QualType lType = lex->getType(); 3875 QualType rType = rex->getType(); 3876 3877 // For non-floating point types, check for self-comparisons of the form 3878 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3879 // often indicate logic errors in the program. 3880 if (!lType->isFloatingType()) { 3881 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3882 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3883 if (DRL->getDecl() == DRR->getDecl()) 3884 Diag(Loc, diag::warn_selfcomparison); 3885 } 3886 3887 // Check for comparisons of floating point operands using != and ==. 3888 if (!isRelational && lType->isFloatingType()) { 3889 assert (rType->isFloatingType()); 3890 CheckFloatComparison(Loc,lex,rex); 3891 } 3892 3893 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 3894 // just reject all vector comparisons for now. 3895 if (1) { 3896 Diag(Loc, diag::err_typecheck_vector_comparison) 3897 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3898 return QualType(); 3899 } 3900 3901 // Return the type for the comparison, which is the same as vector type for 3902 // integer vectors, or an integer type of identical size and number of 3903 // elements for floating point vectors. 3904 if (lType->isIntegerType()) 3905 return lType; 3906 3907 const VectorType *VTy = lType->getAsVectorType(); 3908 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3909 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3910 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3911 if (TypeSize == Context.getTypeSize(Context.LongTy)) 3912 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3913 3914 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3915 "Unhandled vector element size in vector compare"); 3916 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3917} 3918 3919inline QualType Sema::CheckBitwiseOperands( 3920 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3921{ 3922 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3923 return CheckVectorOperands(Loc, lex, rex); 3924 3925 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3926 3927 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3928 return compType; 3929 return InvalidOperands(Loc, lex, rex); 3930} 3931 3932inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3933 Expr *&lex, Expr *&rex, SourceLocation Loc) 3934{ 3935 UsualUnaryConversions(lex); 3936 UsualUnaryConversions(rex); 3937 3938 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3939 return Context.IntTy; 3940 return InvalidOperands(Loc, lex, rex); 3941} 3942 3943/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3944/// is a read-only property; return true if so. A readonly property expression 3945/// depends on various declarations and thus must be treated specially. 3946/// 3947static bool IsReadonlyProperty(Expr *E, Sema &S) 3948{ 3949 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3950 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3951 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3952 QualType BaseType = PropExpr->getBase()->getType(); 3953 if (const PointerType *PTy = BaseType->getAsPointerType()) 3954 if (const ObjCInterfaceType *IFTy = 3955 PTy->getPointeeType()->getAsObjCInterfaceType()) 3956 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3957 if (S.isPropertyReadonly(PDecl, IFace)) 3958 return true; 3959 } 3960 } 3961 return false; 3962} 3963 3964/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3965/// emit an error and return true. If so, return false. 3966static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3967 SourceLocation OrigLoc = Loc; 3968 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 3969 &Loc); 3970 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3971 IsLV = Expr::MLV_ReadonlyProperty; 3972 if (IsLV == Expr::MLV_Valid) 3973 return false; 3974 3975 unsigned Diag = 0; 3976 bool NeedType = false; 3977 switch (IsLV) { // C99 6.5.16p2 3978 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3979 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3980 case Expr::MLV_ArrayType: 3981 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3982 NeedType = true; 3983 break; 3984 case Expr::MLV_NotObjectType: 3985 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3986 NeedType = true; 3987 break; 3988 case Expr::MLV_LValueCast: 3989 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3990 break; 3991 case Expr::MLV_InvalidExpression: 3992 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3993 break; 3994 case Expr::MLV_IncompleteType: 3995 case Expr::MLV_IncompleteVoidType: 3996 return S.RequireCompleteType(Loc, E->getType(), 3997 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3998 E->getSourceRange()); 3999 case Expr::MLV_DuplicateVectorComponents: 4000 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4001 break; 4002 case Expr::MLV_NotBlockQualified: 4003 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4004 break; 4005 case Expr::MLV_ReadonlyProperty: 4006 Diag = diag::error_readonly_property_assignment; 4007 break; 4008 case Expr::MLV_NoSetterProperty: 4009 Diag = diag::error_nosetter_property_assignment; 4010 break; 4011 } 4012 4013 SourceRange Assign; 4014 if (Loc != OrigLoc) 4015 Assign = SourceRange(OrigLoc, OrigLoc); 4016 if (NeedType) 4017 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4018 else 4019 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4020 return true; 4021} 4022 4023 4024 4025// C99 6.5.16.1 4026QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4027 SourceLocation Loc, 4028 QualType CompoundType) { 4029 // Verify that LHS is a modifiable lvalue, and emit error if not. 4030 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4031 return QualType(); 4032 4033 QualType LHSType = LHS->getType(); 4034 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4035 4036 AssignConvertType ConvTy; 4037 if (CompoundType.isNull()) { 4038 // Simple assignment "x = y". 4039 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4040 // Special case of NSObject attributes on c-style pointer types. 4041 if (ConvTy == IncompatiblePointer && 4042 ((Context.isObjCNSObjectType(LHSType) && 4043 Context.isObjCObjectPointerType(RHSType)) || 4044 (Context.isObjCNSObjectType(RHSType) && 4045 Context.isObjCObjectPointerType(LHSType)))) 4046 ConvTy = Compatible; 4047 4048 // If the RHS is a unary plus or minus, check to see if they = and + are 4049 // right next to each other. If so, the user may have typo'd "x =+ 4" 4050 // instead of "x += 4". 4051 Expr *RHSCheck = RHS; 4052 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4053 RHSCheck = ICE->getSubExpr(); 4054 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4055 if ((UO->getOpcode() == UnaryOperator::Plus || 4056 UO->getOpcode() == UnaryOperator::Minus) && 4057 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4058 // Only if the two operators are exactly adjacent. 4059 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4060 // And there is a space or other character before the subexpr of the 4061 // unary +/-. We don't want to warn on "x=-1". 4062 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4063 UO->getSubExpr()->getLocStart().isFileID()) { 4064 Diag(Loc, diag::warn_not_compound_assign) 4065 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4066 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4067 } 4068 } 4069 } else { 4070 // Compound assignment "x += y" 4071 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 4072 } 4073 4074 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4075 RHS, "assigning")) 4076 return QualType(); 4077 4078 // C99 6.5.16p3: The type of an assignment expression is the type of the 4079 // left operand unless the left operand has qualified type, in which case 4080 // it is the unqualified version of the type of the left operand. 4081 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4082 // is converted to the type of the assignment expression (above). 4083 // C++ 5.17p1: the type of the assignment expression is that of its left 4084 // operand. 4085 return LHSType.getUnqualifiedType(); 4086} 4087 4088// C99 6.5.17 4089QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4090 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4091 DefaultFunctionArrayConversion(RHS); 4092 4093 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4094 // incomplete in C++). 4095 4096 return RHS->getType(); 4097} 4098 4099/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4100/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4101QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4102 bool isInc) { 4103 if (Op->isTypeDependent()) 4104 return Context.DependentTy; 4105 4106 QualType ResType = Op->getType(); 4107 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4108 4109 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4110 // Decrement of bool is not allowed. 4111 if (!isInc) { 4112 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4113 return QualType(); 4114 } 4115 // Increment of bool sets it to true, but is deprecated. 4116 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4117 } else if (ResType->isRealType()) { 4118 // OK! 4119 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4120 // C99 6.5.2.4p2, 6.5.6p2 4121 if (PT->getPointeeType()->isVoidType()) { 4122 if (getLangOptions().CPlusPlus) { 4123 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4124 << Op->getSourceRange(); 4125 return QualType(); 4126 } 4127 4128 // Pointer to void is a GNU extension in C. 4129 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4130 } else if (PT->getPointeeType()->isFunctionType()) { 4131 if (getLangOptions().CPlusPlus) { 4132 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4133 << Op->getType() << Op->getSourceRange(); 4134 return QualType(); 4135 } 4136 4137 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4138 << ResType << Op->getSourceRange(); 4139 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4140 diag::err_typecheck_arithmetic_incomplete_type, 4141 Op->getSourceRange(), SourceRange(), 4142 ResType)) 4143 return QualType(); 4144 } else if (ResType->isComplexType()) { 4145 // C99 does not support ++/-- on complex types, we allow as an extension. 4146 Diag(OpLoc, diag::ext_integer_increment_complex) 4147 << ResType << Op->getSourceRange(); 4148 } else { 4149 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4150 << ResType << Op->getSourceRange(); 4151 return QualType(); 4152 } 4153 // At this point, we know we have a real, complex or pointer type. 4154 // Now make sure the operand is a modifiable lvalue. 4155 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4156 return QualType(); 4157 return ResType; 4158} 4159 4160/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4161/// This routine allows us to typecheck complex/recursive expressions 4162/// where the declaration is needed for type checking. We only need to 4163/// handle cases when the expression references a function designator 4164/// or is an lvalue. Here are some examples: 4165/// - &(x) => x 4166/// - &*****f => f for f a function designator. 4167/// - &s.xx => s 4168/// - &s.zz[1].yy -> s, if zz is an array 4169/// - *(x + 1) -> x, if x is an array 4170/// - &"123"[2] -> 0 4171/// - & __real__ x -> x 4172static NamedDecl *getPrimaryDecl(Expr *E) { 4173 switch (E->getStmtClass()) { 4174 case Stmt::DeclRefExprClass: 4175 case Stmt::QualifiedDeclRefExprClass: 4176 return cast<DeclRefExpr>(E)->getDecl(); 4177 case Stmt::MemberExprClass: 4178 // If this is an arrow operator, the address is an offset from 4179 // the base's value, so the object the base refers to is 4180 // irrelevant. 4181 if (cast<MemberExpr>(E)->isArrow()) 4182 return 0; 4183 // Otherwise, the expression refers to a part of the base 4184 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4185 case Stmt::ArraySubscriptExprClass: { 4186 // FIXME: This code shouldn't be necessary! We should catch the 4187 // implicit promotion of register arrays earlier. 4188 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4189 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4190 if (ICE->getSubExpr()->getType()->isArrayType()) 4191 return getPrimaryDecl(ICE->getSubExpr()); 4192 } 4193 return 0; 4194 } 4195 case Stmt::UnaryOperatorClass: { 4196 UnaryOperator *UO = cast<UnaryOperator>(E); 4197 4198 switch(UO->getOpcode()) { 4199 case UnaryOperator::Real: 4200 case UnaryOperator::Imag: 4201 case UnaryOperator::Extension: 4202 return getPrimaryDecl(UO->getSubExpr()); 4203 default: 4204 return 0; 4205 } 4206 } 4207 case Stmt::ParenExprClass: 4208 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4209 case Stmt::ImplicitCastExprClass: 4210 // If the result of an implicit cast is an l-value, we care about 4211 // the sub-expression; otherwise, the result here doesn't matter. 4212 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4213 default: 4214 return 0; 4215 } 4216} 4217 4218/// CheckAddressOfOperand - The operand of & must be either a function 4219/// designator or an lvalue designating an object. If it is an lvalue, the 4220/// object cannot be declared with storage class register or be a bit field. 4221/// Note: The usual conversions are *not* applied to the operand of the & 4222/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4223/// In C++, the operand might be an overloaded function name, in which case 4224/// we allow the '&' but retain the overloaded-function type. 4225QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4226 // Make sure to ignore parentheses in subsequent checks 4227 op = op->IgnoreParens(); 4228 4229 if (op->isTypeDependent()) 4230 return Context.DependentTy; 4231 4232 if (getLangOptions().C99) { 4233 // Implement C99-only parts of addressof rules. 4234 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4235 if (uOp->getOpcode() == UnaryOperator::Deref) 4236 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4237 // (assuming the deref expression is valid). 4238 return uOp->getSubExpr()->getType(); 4239 } 4240 // Technically, there should be a check for array subscript 4241 // expressions here, but the result of one is always an lvalue anyway. 4242 } 4243 NamedDecl *dcl = getPrimaryDecl(op); 4244 Expr::isLvalueResult lval = op->isLvalue(Context); 4245 4246 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 4247 // The operand must be either an l-value or a function designator 4248 if (!op->getType()->isFunctionType()) { 4249 // FIXME: emit more specific diag... 4250 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4251 << op->getSourceRange(); 4252 return QualType(); 4253 } 4254 } else if (op->getBitField()) { // C99 6.5.3.2p1 4255 // The operand cannot be a bit-field 4256 Diag(OpLoc, diag::err_typecheck_address_of) 4257 << "bit-field" << op->getSourceRange(); 4258 return QualType(); 4259 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4260 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4261 // The operand cannot be an element of a vector 4262 Diag(OpLoc, diag::err_typecheck_address_of) 4263 << "vector element" << op->getSourceRange(); 4264 return QualType(); 4265 } else if (dcl) { // C99 6.5.3.2p1 4266 // We have an lvalue with a decl. Make sure the decl is not declared 4267 // with the register storage-class specifier. 4268 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4269 if (vd->getStorageClass() == VarDecl::Register) { 4270 Diag(OpLoc, diag::err_typecheck_address_of) 4271 << "register variable" << op->getSourceRange(); 4272 return QualType(); 4273 } 4274 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4275 return Context.OverloadTy; 4276 } else if (isa<FieldDecl>(dcl)) { 4277 // Okay: we can take the address of a field. 4278 // Could be a pointer to member, though, if there is an explicit 4279 // scope qualifier for the class. 4280 if (isa<QualifiedDeclRefExpr>(op)) { 4281 DeclContext *Ctx = dcl->getDeclContext(); 4282 if (Ctx && Ctx->isRecord()) 4283 return Context.getMemberPointerType(op->getType(), 4284 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4285 } 4286 } else if (isa<FunctionDecl>(dcl)) { 4287 // Okay: we can take the address of a function. 4288 // As above. 4289 if (isa<QualifiedDeclRefExpr>(op)) { 4290 DeclContext *Ctx = dcl->getDeclContext(); 4291 if (Ctx && Ctx->isRecord()) 4292 return Context.getMemberPointerType(op->getType(), 4293 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4294 } 4295 } 4296 else 4297 assert(0 && "Unknown/unexpected decl type"); 4298 } 4299 4300 // If the operand has type "type", the result has type "pointer to type". 4301 return Context.getPointerType(op->getType()); 4302} 4303 4304QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4305 if (Op->isTypeDependent()) 4306 return Context.DependentTy; 4307 4308 UsualUnaryConversions(Op); 4309 QualType Ty = Op->getType(); 4310 4311 // Note that per both C89 and C99, this is always legal, even if ptype is an 4312 // incomplete type or void. It would be possible to warn about dereferencing 4313 // a void pointer, but it's completely well-defined, and such a warning is 4314 // unlikely to catch any mistakes. 4315 if (const PointerType *PT = Ty->getAsPointerType()) 4316 return PT->getPointeeType(); 4317 4318 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4319 << Ty << Op->getSourceRange(); 4320 return QualType(); 4321} 4322 4323static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4324 tok::TokenKind Kind) { 4325 BinaryOperator::Opcode Opc; 4326 switch (Kind) { 4327 default: assert(0 && "Unknown binop!"); 4328 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4329 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4330 case tok::star: Opc = BinaryOperator::Mul; break; 4331 case tok::slash: Opc = BinaryOperator::Div; break; 4332 case tok::percent: Opc = BinaryOperator::Rem; break; 4333 case tok::plus: Opc = BinaryOperator::Add; break; 4334 case tok::minus: Opc = BinaryOperator::Sub; break; 4335 case tok::lessless: Opc = BinaryOperator::Shl; break; 4336 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4337 case tok::lessequal: Opc = BinaryOperator::LE; break; 4338 case tok::less: Opc = BinaryOperator::LT; break; 4339 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4340 case tok::greater: Opc = BinaryOperator::GT; break; 4341 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4342 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4343 case tok::amp: Opc = BinaryOperator::And; break; 4344 case tok::caret: Opc = BinaryOperator::Xor; break; 4345 case tok::pipe: Opc = BinaryOperator::Or; break; 4346 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4347 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4348 case tok::equal: Opc = BinaryOperator::Assign; break; 4349 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4350 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4351 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4352 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4353 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4354 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4355 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4356 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4357 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4358 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4359 case tok::comma: Opc = BinaryOperator::Comma; break; 4360 } 4361 return Opc; 4362} 4363 4364static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4365 tok::TokenKind Kind) { 4366 UnaryOperator::Opcode Opc; 4367 switch (Kind) { 4368 default: assert(0 && "Unknown unary op!"); 4369 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4370 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4371 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4372 case tok::star: Opc = UnaryOperator::Deref; break; 4373 case tok::plus: Opc = UnaryOperator::Plus; break; 4374 case tok::minus: Opc = UnaryOperator::Minus; break; 4375 case tok::tilde: Opc = UnaryOperator::Not; break; 4376 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4377 case tok::kw___real: Opc = UnaryOperator::Real; break; 4378 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4379 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4380 } 4381 return Opc; 4382} 4383 4384/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4385/// operator @p Opc at location @c TokLoc. This routine only supports 4386/// built-in operations; ActOnBinOp handles overloaded operators. 4387Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4388 unsigned Op, 4389 Expr *lhs, Expr *rhs) { 4390 QualType ResultTy; // Result type of the binary operator. 4391 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4392 // The following two variables are used for compound assignment operators 4393 QualType CompLHSTy; // Type of LHS after promotions for computation 4394 QualType CompResultTy; // Type of computation result 4395 4396 switch (Opc) { 4397 case BinaryOperator::Assign: 4398 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4399 break; 4400 case BinaryOperator::PtrMemD: 4401 case BinaryOperator::PtrMemI: 4402 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4403 Opc == BinaryOperator::PtrMemI); 4404 break; 4405 case BinaryOperator::Mul: 4406 case BinaryOperator::Div: 4407 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4408 break; 4409 case BinaryOperator::Rem: 4410 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4411 break; 4412 case BinaryOperator::Add: 4413 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4414 break; 4415 case BinaryOperator::Sub: 4416 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4417 break; 4418 case BinaryOperator::Shl: 4419 case BinaryOperator::Shr: 4420 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4421 break; 4422 case BinaryOperator::LE: 4423 case BinaryOperator::LT: 4424 case BinaryOperator::GE: 4425 case BinaryOperator::GT: 4426 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4427 break; 4428 case BinaryOperator::EQ: 4429 case BinaryOperator::NE: 4430 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4431 break; 4432 case BinaryOperator::And: 4433 case BinaryOperator::Xor: 4434 case BinaryOperator::Or: 4435 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4436 break; 4437 case BinaryOperator::LAnd: 4438 case BinaryOperator::LOr: 4439 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4440 break; 4441 case BinaryOperator::MulAssign: 4442 case BinaryOperator::DivAssign: 4443 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4444 CompLHSTy = CompResultTy; 4445 if (!CompResultTy.isNull()) 4446 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4447 break; 4448 case BinaryOperator::RemAssign: 4449 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4450 CompLHSTy = CompResultTy; 4451 if (!CompResultTy.isNull()) 4452 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4453 break; 4454 case BinaryOperator::AddAssign: 4455 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4456 if (!CompResultTy.isNull()) 4457 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4458 break; 4459 case BinaryOperator::SubAssign: 4460 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4461 if (!CompResultTy.isNull()) 4462 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4463 break; 4464 case BinaryOperator::ShlAssign: 4465 case BinaryOperator::ShrAssign: 4466 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4467 CompLHSTy = CompResultTy; 4468 if (!CompResultTy.isNull()) 4469 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4470 break; 4471 case BinaryOperator::AndAssign: 4472 case BinaryOperator::XorAssign: 4473 case BinaryOperator::OrAssign: 4474 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4475 CompLHSTy = CompResultTy; 4476 if (!CompResultTy.isNull()) 4477 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4478 break; 4479 case BinaryOperator::Comma: 4480 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4481 break; 4482 } 4483 if (ResultTy.isNull()) 4484 return ExprError(); 4485 if (CompResultTy.isNull()) 4486 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4487 else 4488 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4489 CompLHSTy, CompResultTy, 4490 OpLoc)); 4491} 4492 4493// Binary Operators. 'Tok' is the token for the operator. 4494Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4495 tok::TokenKind Kind, 4496 ExprArg LHS, ExprArg RHS) { 4497 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4498 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4499 4500 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4501 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4502 4503 if (getLangOptions().CPlusPlus && 4504 (lhs->getType()->isOverloadableType() || 4505 rhs->getType()->isOverloadableType())) { 4506 // Find all of the overloaded operators visible from this 4507 // point. We perform both an operator-name lookup from the local 4508 // scope and an argument-dependent lookup based on the types of 4509 // the arguments. 4510 FunctionSet Functions; 4511 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4512 if (OverOp != OO_None) { 4513 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4514 Functions); 4515 Expr *Args[2] = { lhs, rhs }; 4516 DeclarationName OpName 4517 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4518 ArgumentDependentLookup(OpName, Args, 2, Functions); 4519 } 4520 4521 // Build the (potentially-overloaded, potentially-dependent) 4522 // binary operation. 4523 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4524 } 4525 4526 // Build a built-in binary operation. 4527 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4528} 4529 4530Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4531 unsigned OpcIn, 4532 ExprArg InputArg) { 4533 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4534 4535 // FIXME: Input is modified below, but InputArg is not updated 4536 // appropriately. 4537 Expr *Input = (Expr *)InputArg.get(); 4538 QualType resultType; 4539 switch (Opc) { 4540 case UnaryOperator::PostInc: 4541 case UnaryOperator::PostDec: 4542 case UnaryOperator::OffsetOf: 4543 assert(false && "Invalid unary operator"); 4544 break; 4545 4546 case UnaryOperator::PreInc: 4547 case UnaryOperator::PreDec: 4548 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4549 Opc == UnaryOperator::PreInc); 4550 break; 4551 case UnaryOperator::AddrOf: 4552 resultType = CheckAddressOfOperand(Input, OpLoc); 4553 break; 4554 case UnaryOperator::Deref: 4555 DefaultFunctionArrayConversion(Input); 4556 resultType = CheckIndirectionOperand(Input, OpLoc); 4557 break; 4558 case UnaryOperator::Plus: 4559 case UnaryOperator::Minus: 4560 UsualUnaryConversions(Input); 4561 resultType = Input->getType(); 4562 if (resultType->isDependentType()) 4563 break; 4564 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4565 break; 4566 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4567 resultType->isEnumeralType()) 4568 break; 4569 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4570 Opc == UnaryOperator::Plus && 4571 resultType->isPointerType()) 4572 break; 4573 4574 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4575 << resultType << Input->getSourceRange()); 4576 case UnaryOperator::Not: // bitwise complement 4577 UsualUnaryConversions(Input); 4578 resultType = Input->getType(); 4579 if (resultType->isDependentType()) 4580 break; 4581 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4582 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4583 // C99 does not support '~' for complex conjugation. 4584 Diag(OpLoc, diag::ext_integer_complement_complex) 4585 << resultType << Input->getSourceRange(); 4586 else if (!resultType->isIntegerType()) 4587 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4588 << resultType << Input->getSourceRange()); 4589 break; 4590 case UnaryOperator::LNot: // logical negation 4591 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4592 DefaultFunctionArrayConversion(Input); 4593 resultType = Input->getType(); 4594 if (resultType->isDependentType()) 4595 break; 4596 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4597 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4598 << resultType << Input->getSourceRange()); 4599 // LNot always has type int. C99 6.5.3.3p5. 4600 // In C++, it's bool. C++ 5.3.1p8 4601 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4602 break; 4603 case UnaryOperator::Real: 4604 case UnaryOperator::Imag: 4605 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4606 break; 4607 case UnaryOperator::Extension: 4608 resultType = Input->getType(); 4609 break; 4610 } 4611 if (resultType.isNull()) 4612 return ExprError(); 4613 4614 InputArg.release(); 4615 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4616} 4617 4618// Unary Operators. 'Tok' is the token for the operator. 4619Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4620 tok::TokenKind Op, ExprArg input) { 4621 Expr *Input = (Expr*)input.get(); 4622 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4623 4624 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4625 // Find all of the overloaded operators visible from this 4626 // point. We perform both an operator-name lookup from the local 4627 // scope and an argument-dependent lookup based on the types of 4628 // the arguments. 4629 FunctionSet Functions; 4630 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4631 if (OverOp != OO_None) { 4632 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4633 Functions); 4634 DeclarationName OpName 4635 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4636 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4637 } 4638 4639 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4640 } 4641 4642 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4643} 4644 4645/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4646Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4647 SourceLocation LabLoc, 4648 IdentifierInfo *LabelII) { 4649 // Look up the record for this label identifier. 4650 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4651 4652 // If we haven't seen this label yet, create a forward reference. It 4653 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4654 if (LabelDecl == 0) 4655 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4656 4657 // Create the AST node. The address of a label always has type 'void*'. 4658 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4659 Context.getPointerType(Context.VoidTy))); 4660} 4661 4662Sema::OwningExprResult 4663Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4664 SourceLocation RPLoc) { // "({..})" 4665 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4666 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4667 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4668 4669 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4670 if (isFileScope) 4671 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4672 4673 // FIXME: there are a variety of strange constraints to enforce here, for 4674 // example, it is not possible to goto into a stmt expression apparently. 4675 // More semantic analysis is needed. 4676 4677 // If there are sub stmts in the compound stmt, take the type of the last one 4678 // as the type of the stmtexpr. 4679 QualType Ty = Context.VoidTy; 4680 4681 if (!Compound->body_empty()) { 4682 Stmt *LastStmt = Compound->body_back(); 4683 // If LastStmt is a label, skip down through into the body. 4684 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4685 LastStmt = Label->getSubStmt(); 4686 4687 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4688 Ty = LastExpr->getType(); 4689 } 4690 4691 // FIXME: Check that expression type is complete/non-abstract; statement 4692 // expressions are not lvalues. 4693 4694 substmt.release(); 4695 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4696} 4697 4698Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4699 SourceLocation BuiltinLoc, 4700 SourceLocation TypeLoc, 4701 TypeTy *argty, 4702 OffsetOfComponent *CompPtr, 4703 unsigned NumComponents, 4704 SourceLocation RPLoc) { 4705 // FIXME: This function leaks all expressions in the offset components on 4706 // error. 4707 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4708 assert(!ArgTy.isNull() && "Missing type argument!"); 4709 4710 bool Dependent = ArgTy->isDependentType(); 4711 4712 // We must have at least one component that refers to the type, and the first 4713 // one is known to be a field designator. Verify that the ArgTy represents 4714 // a struct/union/class. 4715 if (!Dependent && !ArgTy->isRecordType()) 4716 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4717 4718 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4719 // with an incomplete type would be illegal. 4720 4721 // Otherwise, create a null pointer as the base, and iteratively process 4722 // the offsetof designators. 4723 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4724 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4725 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4726 ArgTy, SourceLocation()); 4727 4728 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4729 // GCC extension, diagnose them. 4730 // FIXME: This diagnostic isn't actually visible because the location is in 4731 // a system header! 4732 if (NumComponents != 1) 4733 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4734 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4735 4736 if (!Dependent) { 4737 bool DidWarnAboutNonPOD = false; 4738 4739 // FIXME: Dependent case loses a lot of information here. And probably 4740 // leaks like a sieve. 4741 for (unsigned i = 0; i != NumComponents; ++i) { 4742 const OffsetOfComponent &OC = CompPtr[i]; 4743 if (OC.isBrackets) { 4744 // Offset of an array sub-field. TODO: Should we allow vector elements? 4745 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4746 if (!AT) { 4747 Res->Destroy(Context); 4748 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4749 << Res->getType()); 4750 } 4751 4752 // FIXME: C++: Verify that operator[] isn't overloaded. 4753 4754 // Promote the array so it looks more like a normal array subscript 4755 // expression. 4756 DefaultFunctionArrayConversion(Res); 4757 4758 // C99 6.5.2.1p1 4759 Expr *Idx = static_cast<Expr*>(OC.U.E); 4760 // FIXME: Leaks Res 4761 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4762 return ExprError(Diag(Idx->getLocStart(), 4763 diag::err_typecheck_subscript_not_integer) 4764 << Idx->getSourceRange()); 4765 4766 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4767 OC.LocEnd); 4768 continue; 4769 } 4770 4771 const RecordType *RC = Res->getType()->getAsRecordType(); 4772 if (!RC) { 4773 Res->Destroy(Context); 4774 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4775 << Res->getType()); 4776 } 4777 4778 // Get the decl corresponding to this. 4779 RecordDecl *RD = RC->getDecl(); 4780 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 4781 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 4782 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 4783 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 4784 << Res->getType()); 4785 DidWarnAboutNonPOD = true; 4786 } 4787 } 4788 4789 FieldDecl *MemberDecl 4790 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4791 LookupMemberName) 4792 .getAsDecl()); 4793 // FIXME: Leaks Res 4794 if (!MemberDecl) 4795 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4796 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4797 4798 // FIXME: C++: Verify that MemberDecl isn't a static field. 4799 // FIXME: Verify that MemberDecl isn't a bitfield. 4800 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 4801 Res = BuildAnonymousStructUnionMemberReference( 4802 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 4803 } else { 4804 // MemberDecl->getType() doesn't get the right qualifiers, but it 4805 // doesn't matter here. 4806 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4807 MemberDecl->getType().getNonReferenceType()); 4808 } 4809 } 4810 } 4811 4812 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4813 Context.getSizeType(), BuiltinLoc)); 4814} 4815 4816 4817Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4818 TypeTy *arg1,TypeTy *arg2, 4819 SourceLocation RPLoc) { 4820 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4821 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4822 4823 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4824 4825 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4826 argT1, argT2, RPLoc)); 4827} 4828 4829Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4830 ExprArg cond, 4831 ExprArg expr1, ExprArg expr2, 4832 SourceLocation RPLoc) { 4833 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4834 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4835 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4836 4837 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4838 4839 QualType resType; 4840 if (CondExpr->isValueDependent()) { 4841 resType = Context.DependentTy; 4842 } else { 4843 // The conditional expression is required to be a constant expression. 4844 llvm::APSInt condEval(32); 4845 SourceLocation ExpLoc; 4846 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4847 return ExprError(Diag(ExpLoc, 4848 diag::err_typecheck_choose_expr_requires_constant) 4849 << CondExpr->getSourceRange()); 4850 4851 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4852 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4853 } 4854 4855 cond.release(); expr1.release(); expr2.release(); 4856 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4857 resType, RPLoc)); 4858} 4859 4860//===----------------------------------------------------------------------===// 4861// Clang Extensions. 4862//===----------------------------------------------------------------------===// 4863 4864/// ActOnBlockStart - This callback is invoked when a block literal is started. 4865void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4866 // Analyze block parameters. 4867 BlockSemaInfo *BSI = new BlockSemaInfo(); 4868 4869 // Add BSI to CurBlock. 4870 BSI->PrevBlockInfo = CurBlock; 4871 CurBlock = BSI; 4872 4873 BSI->ReturnType = 0; 4874 BSI->TheScope = BlockScope; 4875 BSI->hasBlockDeclRefExprs = false; 4876 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 4877 CurFunctionNeedsScopeChecking = false; 4878 4879 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4880 PushDeclContext(BlockScope, BSI->TheDecl); 4881} 4882 4883void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4884 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4885 4886 ProcessDeclAttributes(CurBlock->TheDecl, ParamInfo); 4887 4888 if (ParamInfo.getNumTypeObjects() == 0 4889 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4890 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4891 4892 if (T->isArrayType()) { 4893 Diag(ParamInfo.getSourceRange().getBegin(), 4894 diag::err_block_returns_array); 4895 return; 4896 } 4897 4898 // The parameter list is optional, if there was none, assume (). 4899 if (!T->isFunctionType()) 4900 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4901 4902 CurBlock->hasPrototype = true; 4903 CurBlock->isVariadic = false; 4904 4905 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 4906 4907 // Do not allow returning a objc interface by-value. 4908 if (RetTy->isObjCInterfaceType()) { 4909 Diag(ParamInfo.getSourceRange().getBegin(), 4910 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4911 return; 4912 } 4913 return; 4914 } 4915 4916 // Analyze arguments to block. 4917 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4918 "Not a function declarator!"); 4919 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4920 4921 CurBlock->hasPrototype = FTI.hasPrototype; 4922 CurBlock->isVariadic = true; 4923 4924 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4925 // no arguments, not a function that takes a single void argument. 4926 if (FTI.hasPrototype && 4927 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4928 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 4929 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 4930 // empty arg list, don't push any params. 4931 CurBlock->isVariadic = false; 4932 } else if (FTI.hasPrototype) { 4933 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4934 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 4935 CurBlock->isVariadic = FTI.isVariadic; 4936 } 4937 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4938 CurBlock->Params.size()); 4939 4940 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4941 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4942 // If this has an identifier, add it to the scope stack. 4943 if ((*AI)->getIdentifier()) 4944 PushOnScopeChains(*AI, CurBlock->TheScope); 4945 4946 // Analyze the return type. 4947 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4948 QualType RetTy = T->getAsFunctionType()->getResultType(); 4949 4950 // Do not allow returning a objc interface by-value. 4951 if (RetTy->isObjCInterfaceType()) { 4952 Diag(ParamInfo.getSourceRange().getBegin(), 4953 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4954 } else if (!RetTy->isDependentType()) 4955 CurBlock->ReturnType = RetTy.getTypePtr(); 4956} 4957 4958/// ActOnBlockError - If there is an error parsing a block, this callback 4959/// is invoked to pop the information about the block from the action impl. 4960void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4961 // Ensure that CurBlock is deleted. 4962 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4963 4964 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 4965 4966 // Pop off CurBlock, handle nested blocks. 4967 PopDeclContext(); 4968 CurBlock = CurBlock->PrevBlockInfo; 4969 // FIXME: Delete the ParmVarDecl objects as well??? 4970} 4971 4972/// ActOnBlockStmtExpr - This is called when the body of a block statement 4973/// literal was successfully completed. ^(int x){...} 4974Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4975 StmtArg body, Scope *CurScope) { 4976 // If blocks are disabled, emit an error. 4977 if (!LangOpts.Blocks) 4978 Diag(CaretLoc, diag::err_blocks_disable); 4979 4980 // Ensure that CurBlock is deleted. 4981 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4982 4983 PopDeclContext(); 4984 4985 // Pop off CurBlock, handle nested blocks. 4986 CurBlock = CurBlock->PrevBlockInfo; 4987 4988 QualType RetTy = Context.VoidTy; 4989 if (BSI->ReturnType) 4990 RetTy = QualType(BSI->ReturnType, 0); 4991 4992 llvm::SmallVector<QualType, 8> ArgTypes; 4993 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4994 ArgTypes.push_back(BSI->Params[i]->getType()); 4995 4996 QualType BlockTy; 4997 if (!BSI->hasPrototype) 4998 BlockTy = Context.getFunctionNoProtoType(RetTy); 4999 else 5000 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 5001 BSI->isVariadic, 0); 5002 5003 // FIXME: Check that return/parameter types are complete/non-abstract 5004 5005 BlockTy = Context.getBlockPointerType(BlockTy); 5006 5007 // If needed, diagnose invalid gotos and switches in the block. 5008 if (CurFunctionNeedsScopeChecking) 5009 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5010 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5011 5012 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5013 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5014 BSI->hasBlockDeclRefExprs)); 5015} 5016 5017Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5018 ExprArg expr, TypeTy *type, 5019 SourceLocation RPLoc) { 5020 QualType T = QualType::getFromOpaquePtr(type); 5021 Expr *E = static_cast<Expr*>(expr.get()); 5022 Expr *OrigExpr = E; 5023 5024 InitBuiltinVaListType(); 5025 5026 // Get the va_list type 5027 QualType VaListType = Context.getBuiltinVaListType(); 5028 // Deal with implicit array decay; for example, on x86-64, 5029 // va_list is an array, but it's supposed to decay to 5030 // a pointer for va_arg. 5031 if (VaListType->isArrayType()) 5032 VaListType = Context.getArrayDecayedType(VaListType); 5033 // Make sure the input expression also decays appropriately. 5034 UsualUnaryConversions(E); 5035 5036 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) { 5037 return ExprError(Diag(E->getLocStart(), 5038 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5039 << OrigExpr->getType() << E->getSourceRange()); 5040 } 5041 5042 // FIXME: Check that type is complete/non-abstract 5043 // FIXME: Warn if a non-POD type is passed in. 5044 5045 expr.release(); 5046 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5047 RPLoc)); 5048} 5049 5050Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5051 // The type of __null will be int or long, depending on the size of 5052 // pointers on the target. 5053 QualType Ty; 5054 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5055 Ty = Context.IntTy; 5056 else 5057 Ty = Context.LongTy; 5058 5059 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5060} 5061 5062bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5063 SourceLocation Loc, 5064 QualType DstType, QualType SrcType, 5065 Expr *SrcExpr, const char *Flavor) { 5066 // Decode the result (notice that AST's are still created for extensions). 5067 bool isInvalid = false; 5068 unsigned DiagKind; 5069 switch (ConvTy) { 5070 default: assert(0 && "Unknown conversion type"); 5071 case Compatible: return false; 5072 case PointerToInt: 5073 DiagKind = diag::ext_typecheck_convert_pointer_int; 5074 break; 5075 case IntToPointer: 5076 DiagKind = diag::ext_typecheck_convert_int_pointer; 5077 break; 5078 case IncompatiblePointer: 5079 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5080 break; 5081 case IncompatiblePointerSign: 5082 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5083 break; 5084 case FunctionVoidPointer: 5085 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5086 break; 5087 case CompatiblePointerDiscardsQualifiers: 5088 // If the qualifiers lost were because we were applying the 5089 // (deprecated) C++ conversion from a string literal to a char* 5090 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5091 // Ideally, this check would be performed in 5092 // CheckPointerTypesForAssignment. However, that would require a 5093 // bit of refactoring (so that the second argument is an 5094 // expression, rather than a type), which should be done as part 5095 // of a larger effort to fix CheckPointerTypesForAssignment for 5096 // C++ semantics. 5097 if (getLangOptions().CPlusPlus && 5098 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5099 return false; 5100 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5101 break; 5102 case IntToBlockPointer: 5103 DiagKind = diag::err_int_to_block_pointer; 5104 break; 5105 case IncompatibleBlockPointer: 5106 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5107 break; 5108 case IncompatibleObjCQualifiedId: 5109 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5110 // it can give a more specific diagnostic. 5111 DiagKind = diag::warn_incompatible_qualified_id; 5112 break; 5113 case IncompatibleVectors: 5114 DiagKind = diag::warn_incompatible_vectors; 5115 break; 5116 case Incompatible: 5117 DiagKind = diag::err_typecheck_convert_incompatible; 5118 isInvalid = true; 5119 break; 5120 } 5121 5122 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5123 << SrcExpr->getSourceRange(); 5124 return isInvalid; 5125} 5126 5127bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5128 llvm::APSInt ICEResult; 5129 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5130 if (Result) 5131 *Result = ICEResult; 5132 return false; 5133 } 5134 5135 Expr::EvalResult EvalResult; 5136 5137 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5138 EvalResult.HasSideEffects) { 5139 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5140 5141 if (EvalResult.Diag) { 5142 // We only show the note if it's not the usual "invalid subexpression" 5143 // or if it's actually in a subexpression. 5144 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5145 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5146 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5147 } 5148 5149 return true; 5150 } 5151 5152 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5153 E->getSourceRange(); 5154 5155 if (EvalResult.Diag && 5156 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5157 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5158 5159 if (Result) 5160 *Result = EvalResult.Val.getInt(); 5161 return false; 5162} 5163