SemaExpr.cpp revision 45b1e22a0aeb450188be75c8ea07ea70a757ce20
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 91/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 92/// (and other functions in future), which have been declared with sentinel 93/// attribute. It warns if call does not have the sentinel argument. 94/// 95void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 96 Expr **Args, unsigned NumArgs) 97{ 98 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 99 if (!attr) 100 return; 101 int sentinelPos = attr->getSentinel(); 102 int nullPos = attr->getNullPos(); 103 104 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 105 // base class. Then we won't be needing two versions of the same code. 106 unsigned int i = 0; 107 bool warnNotEnoughArgs = false; 108 int isMethod = 0; 109 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 110 // skip over named parameters. 111 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 112 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 113 if (nullPos) 114 --nullPos; 115 else 116 ++i; 117 } 118 warnNotEnoughArgs = (P != E || i >= NumArgs); 119 isMethod = 1; 120 } 121 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 122 // skip over named parameters. 123 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 124 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 125 if (nullPos) 126 --nullPos; 127 else 128 ++i; 129 } 130 warnNotEnoughArgs = (P != E || i >= NumArgs); 131 } 132 else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 133 // block or function pointer call. 134 QualType Ty = V->getType(); 135 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 136 const FunctionType *FT = Ty->isFunctionPointerType() 137 ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType() 138 : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); 139 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 140 unsigned NumArgsInProto = Proto->getNumArgs(); 141 unsigned k; 142 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 143 if (nullPos) 144 --nullPos; 145 else 146 ++i; 147 } 148 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 149 } 150 if (Ty->isBlockPointerType()) 151 isMethod = 2; 152 } 153 else 154 return; 155 } 156 else 157 return; 158 159 if (warnNotEnoughArgs) { 160 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 161 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 162 return; 163 } 164 int sentinel = i; 165 while (sentinelPos > 0 && i < NumArgs-1) { 166 --sentinelPos; 167 ++i; 168 } 169 if (sentinelPos > 0) { 170 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 171 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 172 return; 173 } 174 while (i < NumArgs-1) { 175 ++i; 176 ++sentinel; 177 } 178 Expr *sentinelExpr = Args[sentinel]; 179 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 180 !sentinelExpr->isNullPointerConstant(Context))) { 181 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 182 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 183 } 184 return; 185} 186 187SourceRange Sema::getExprRange(ExprTy *E) const { 188 Expr *Ex = (Expr *)E; 189 return Ex? Ex->getSourceRange() : SourceRange(); 190} 191 192//===----------------------------------------------------------------------===// 193// Standard Promotions and Conversions 194//===----------------------------------------------------------------------===// 195 196/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 197void Sema::DefaultFunctionArrayConversion(Expr *&E) { 198 QualType Ty = E->getType(); 199 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 200 201 if (Ty->isFunctionType()) 202 ImpCastExprToType(E, Context.getPointerType(Ty)); 203 else if (Ty->isArrayType()) { 204 // In C90 mode, arrays only promote to pointers if the array expression is 205 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 206 // type 'array of type' is converted to an expression that has type 'pointer 207 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 208 // that has type 'array of type' ...". The relevant change is "an lvalue" 209 // (C90) to "an expression" (C99). 210 // 211 // C++ 4.2p1: 212 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 213 // T" can be converted to an rvalue of type "pointer to T". 214 // 215 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 216 E->isLvalue(Context) == Expr::LV_Valid) 217 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 218 } 219} 220 221/// \brief Whether this is a promotable bitfield reference according 222/// to C99 6.3.1.1p2, bullet 2. 223/// 224/// \returns the type this bit-field will promote to, or NULL if no 225/// promotion occurs. 226static QualType isPromotableBitField(Expr *E, ASTContext &Context) { 227 FieldDecl *Field = E->getBitField(); 228 if (!Field) 229 return QualType(); 230 231 const BuiltinType *BT = Field->getType()->getAsBuiltinType(); 232 if (!BT) 233 return QualType(); 234 235 if (BT->getKind() != BuiltinType::Bool && 236 BT->getKind() != BuiltinType::Int && 237 BT->getKind() != BuiltinType::UInt) 238 return QualType(); 239 240 llvm::APSInt BitWidthAP; 241 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) 242 return QualType(); 243 244 uint64_t BitWidth = BitWidthAP.getZExtValue(); 245 uint64_t IntSize = Context.getTypeSize(Context.IntTy); 246 if (BitWidth < IntSize || 247 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) 248 return Context.IntTy; 249 250 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) 251 return Context.UnsignedIntTy; 252 253 return QualType(); 254} 255 256/// UsualUnaryConversions - Performs various conversions that are common to most 257/// operators (C99 6.3). The conversions of array and function types are 258/// sometimes surpressed. For example, the array->pointer conversion doesn't 259/// apply if the array is an argument to the sizeof or address (&) operators. 260/// In these instances, this routine should *not* be called. 261Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 262 QualType Ty = Expr->getType(); 263 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 264 265 // C99 6.3.1.1p2: 266 // 267 // The following may be used in an expression wherever an int or 268 // unsigned int may be used: 269 // - an object or expression with an integer type whose integer 270 // conversion rank is less than or equal to the rank of int 271 // and unsigned int. 272 // - A bit-field of type _Bool, int, signed int, or unsigned int. 273 // 274 // If an int can represent all values of the original type, the 275 // value is converted to an int; otherwise, it is converted to an 276 // unsigned int. These are called the integer promotions. All 277 // other types are unchanged by the integer promotions. 278 if (Ty->isPromotableIntegerType()) { 279 ImpCastExprToType(Expr, Context.IntTy); 280 return Expr; 281 } else { 282 QualType T = isPromotableBitField(Expr, Context); 283 if (!T.isNull()) { 284 ImpCastExprToType(Expr, T); 285 return Expr; 286 } 287 } 288 289 DefaultFunctionArrayConversion(Expr); 290 return Expr; 291} 292 293/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 294/// do not have a prototype. Arguments that have type float are promoted to 295/// double. All other argument types are converted by UsualUnaryConversions(). 296void Sema::DefaultArgumentPromotion(Expr *&Expr) { 297 QualType Ty = Expr->getType(); 298 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 299 300 // If this is a 'float' (CVR qualified or typedef) promote to double. 301 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 302 if (BT->getKind() == BuiltinType::Float) 303 return ImpCastExprToType(Expr, Context.DoubleTy); 304 305 UsualUnaryConversions(Expr); 306} 307 308/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 309/// will warn if the resulting type is not a POD type, and rejects ObjC 310/// interfaces passed by value. This returns true if the argument type is 311/// completely illegal. 312bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 313 DefaultArgumentPromotion(Expr); 314 315 if (Expr->getType()->isObjCInterfaceType()) { 316 Diag(Expr->getLocStart(), 317 diag::err_cannot_pass_objc_interface_to_vararg) 318 << Expr->getType() << CT; 319 return true; 320 } 321 322 if (!Expr->getType()->isPODType()) 323 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 324 << Expr->getType() << CT; 325 326 return false; 327} 328 329 330/// UsualArithmeticConversions - Performs various conversions that are common to 331/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 332/// routine returns the first non-arithmetic type found. The client is 333/// responsible for emitting appropriate error diagnostics. 334/// FIXME: verify the conversion rules for "complex int" are consistent with 335/// GCC. 336QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 337 bool isCompAssign) { 338 if (!isCompAssign) 339 UsualUnaryConversions(lhsExpr); 340 341 UsualUnaryConversions(rhsExpr); 342 343 // For conversion purposes, we ignore any qualifiers. 344 // For example, "const float" and "float" are equivalent. 345 QualType lhs = 346 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 347 QualType rhs = 348 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 349 350 // If both types are identical, no conversion is needed. 351 if (lhs == rhs) 352 return lhs; 353 354 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 355 // The caller can deal with this (e.g. pointer + int). 356 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 357 return lhs; 358 359 // Perform bitfield promotions. 360 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); 361 if (!LHSBitfieldPromoteTy.isNull()) 362 lhs = LHSBitfieldPromoteTy; 363 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); 364 if (!RHSBitfieldPromoteTy.isNull()) 365 rhs = RHSBitfieldPromoteTy; 366 367 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 368 if (!isCompAssign) 369 ImpCastExprToType(lhsExpr, destType); 370 ImpCastExprToType(rhsExpr, destType); 371 return destType; 372} 373 374QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 375 // Perform the usual unary conversions. We do this early so that 376 // integral promotions to "int" can allow us to exit early, in the 377 // lhs == rhs check. Also, for conversion purposes, we ignore any 378 // qualifiers. For example, "const float" and "float" are 379 // equivalent. 380 if (lhs->isPromotableIntegerType()) 381 lhs = Context.IntTy; 382 else 383 lhs = lhs.getUnqualifiedType(); 384 if (rhs->isPromotableIntegerType()) 385 rhs = Context.IntTy; 386 else 387 rhs = rhs.getUnqualifiedType(); 388 389 // If both types are identical, no conversion is needed. 390 if (lhs == rhs) 391 return lhs; 392 393 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 394 // The caller can deal with this (e.g. pointer + int). 395 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 396 return lhs; 397 398 // At this point, we have two different arithmetic types. 399 400 // Handle complex types first (C99 6.3.1.8p1). 401 if (lhs->isComplexType() || rhs->isComplexType()) { 402 // if we have an integer operand, the result is the complex type. 403 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 404 // convert the rhs to the lhs complex type. 405 return lhs; 406 } 407 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 408 // convert the lhs to the rhs complex type. 409 return rhs; 410 } 411 // This handles complex/complex, complex/float, or float/complex. 412 // When both operands are complex, the shorter operand is converted to the 413 // type of the longer, and that is the type of the result. This corresponds 414 // to what is done when combining two real floating-point operands. 415 // The fun begins when size promotion occur across type domains. 416 // From H&S 6.3.4: When one operand is complex and the other is a real 417 // floating-point type, the less precise type is converted, within it's 418 // real or complex domain, to the precision of the other type. For example, 419 // when combining a "long double" with a "double _Complex", the 420 // "double _Complex" is promoted to "long double _Complex". 421 int result = Context.getFloatingTypeOrder(lhs, rhs); 422 423 if (result > 0) { // The left side is bigger, convert rhs. 424 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 425 } else if (result < 0) { // The right side is bigger, convert lhs. 426 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 427 } 428 // At this point, lhs and rhs have the same rank/size. Now, make sure the 429 // domains match. This is a requirement for our implementation, C99 430 // does not require this promotion. 431 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 432 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 433 return rhs; 434 } else { // handle "_Complex double, double". 435 return lhs; 436 } 437 } 438 return lhs; // The domain/size match exactly. 439 } 440 // Now handle "real" floating types (i.e. float, double, long double). 441 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 442 // if we have an integer operand, the result is the real floating type. 443 if (rhs->isIntegerType()) { 444 // convert rhs to the lhs floating point type. 445 return lhs; 446 } 447 if (rhs->isComplexIntegerType()) { 448 // convert rhs to the complex floating point type. 449 return Context.getComplexType(lhs); 450 } 451 if (lhs->isIntegerType()) { 452 // convert lhs to the rhs floating point type. 453 return rhs; 454 } 455 if (lhs->isComplexIntegerType()) { 456 // convert lhs to the complex floating point type. 457 return Context.getComplexType(rhs); 458 } 459 // We have two real floating types, float/complex combos were handled above. 460 // Convert the smaller operand to the bigger result. 461 int result = Context.getFloatingTypeOrder(lhs, rhs); 462 if (result > 0) // convert the rhs 463 return lhs; 464 assert(result < 0 && "illegal float comparison"); 465 return rhs; // convert the lhs 466 } 467 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 468 // Handle GCC complex int extension. 469 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 470 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 471 472 if (lhsComplexInt && rhsComplexInt) { 473 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 474 rhsComplexInt->getElementType()) >= 0) 475 return lhs; // convert the rhs 476 return rhs; 477 } else if (lhsComplexInt && rhs->isIntegerType()) { 478 // convert the rhs to the lhs complex type. 479 return lhs; 480 } else if (rhsComplexInt && lhs->isIntegerType()) { 481 // convert the lhs to the rhs complex type. 482 return rhs; 483 } 484 } 485 // Finally, we have two differing integer types. 486 // The rules for this case are in C99 6.3.1.8 487 int compare = Context.getIntegerTypeOrder(lhs, rhs); 488 bool lhsSigned = lhs->isSignedIntegerType(), 489 rhsSigned = rhs->isSignedIntegerType(); 490 QualType destType; 491 if (lhsSigned == rhsSigned) { 492 // Same signedness; use the higher-ranked type 493 destType = compare >= 0 ? lhs : rhs; 494 } else if (compare != (lhsSigned ? 1 : -1)) { 495 // The unsigned type has greater than or equal rank to the 496 // signed type, so use the unsigned type 497 destType = lhsSigned ? rhs : lhs; 498 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 499 // The two types are different widths; if we are here, that 500 // means the signed type is larger than the unsigned type, so 501 // use the signed type. 502 destType = lhsSigned ? lhs : rhs; 503 } else { 504 // The signed type is higher-ranked than the unsigned type, 505 // but isn't actually any bigger (like unsigned int and long 506 // on most 32-bit systems). Use the unsigned type corresponding 507 // to the signed type. 508 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 509 } 510 return destType; 511} 512 513//===----------------------------------------------------------------------===// 514// Semantic Analysis for various Expression Types 515//===----------------------------------------------------------------------===// 516 517 518/// ActOnStringLiteral - The specified tokens were lexed as pasted string 519/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 520/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 521/// multiple tokens. However, the common case is that StringToks points to one 522/// string. 523/// 524Action::OwningExprResult 525Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 526 assert(NumStringToks && "Must have at least one string!"); 527 528 StringLiteralParser Literal(StringToks, NumStringToks, PP); 529 if (Literal.hadError) 530 return ExprError(); 531 532 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 533 for (unsigned i = 0; i != NumStringToks; ++i) 534 StringTokLocs.push_back(StringToks[i].getLocation()); 535 536 QualType StrTy = Context.CharTy; 537 if (Literal.AnyWide) StrTy = Context.getWCharType(); 538 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 539 540 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 541 if (getLangOptions().CPlusPlus) 542 StrTy.addConst(); 543 544 // Get an array type for the string, according to C99 6.4.5. This includes 545 // the nul terminator character as well as the string length for pascal 546 // strings. 547 StrTy = Context.getConstantArrayType(StrTy, 548 llvm::APInt(32, Literal.GetNumStringChars()+1), 549 ArrayType::Normal, 0); 550 551 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 552 return Owned(StringLiteral::Create(Context, Literal.GetString(), 553 Literal.GetStringLength(), 554 Literal.AnyWide, StrTy, 555 &StringTokLocs[0], 556 StringTokLocs.size())); 557} 558 559/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 560/// CurBlock to VD should cause it to be snapshotted (as we do for auto 561/// variables defined outside the block) or false if this is not needed (e.g. 562/// for values inside the block or for globals). 563/// 564/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 565/// up-to-date. 566/// 567static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 568 ValueDecl *VD) { 569 // If the value is defined inside the block, we couldn't snapshot it even if 570 // we wanted to. 571 if (CurBlock->TheDecl == VD->getDeclContext()) 572 return false; 573 574 // If this is an enum constant or function, it is constant, don't snapshot. 575 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 576 return false; 577 578 // If this is a reference to an extern, static, or global variable, no need to 579 // snapshot it. 580 // FIXME: What about 'const' variables in C++? 581 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 582 if (!Var->hasLocalStorage()) 583 return false; 584 585 // Blocks that have these can't be constant. 586 CurBlock->hasBlockDeclRefExprs = true; 587 588 // If we have nested blocks, the decl may be declared in an outer block (in 589 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 590 // be defined outside all of the current blocks (in which case the blocks do 591 // all get the bit). Walk the nesting chain. 592 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 593 NextBlock = NextBlock->PrevBlockInfo) { 594 // If we found the defining block for the variable, don't mark the block as 595 // having a reference outside it. 596 if (NextBlock->TheDecl == VD->getDeclContext()) 597 break; 598 599 // Otherwise, the DeclRef from the inner block causes the outer one to need 600 // a snapshot as well. 601 NextBlock->hasBlockDeclRefExprs = true; 602 } 603 604 return true; 605} 606 607 608 609/// ActOnIdentifierExpr - The parser read an identifier in expression context, 610/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 611/// identifier is used in a function call context. 612/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 613/// class or namespace that the identifier must be a member of. 614Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 615 IdentifierInfo &II, 616 bool HasTrailingLParen, 617 const CXXScopeSpec *SS, 618 bool isAddressOfOperand) { 619 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 620 isAddressOfOperand); 621} 622 623/// BuildDeclRefExpr - Build either a DeclRefExpr or a 624/// QualifiedDeclRefExpr based on whether or not SS is a 625/// nested-name-specifier. 626DeclRefExpr * 627Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 628 bool TypeDependent, bool ValueDependent, 629 const CXXScopeSpec *SS) { 630 if (SS && !SS->isEmpty()) { 631 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 632 ValueDependent, SS->getRange(), 633 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 634 } else 635 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 636} 637 638/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 639/// variable corresponding to the anonymous union or struct whose type 640/// is Record. 641static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 642 RecordDecl *Record) { 643 assert(Record->isAnonymousStructOrUnion() && 644 "Record must be an anonymous struct or union!"); 645 646 // FIXME: Once Decls are directly linked together, this will be an O(1) 647 // operation rather than a slow walk through DeclContext's vector (which 648 // itself will be eliminated). DeclGroups might make this even better. 649 DeclContext *Ctx = Record->getDeclContext(); 650 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 651 DEnd = Ctx->decls_end(Context); 652 D != DEnd; ++D) { 653 if (*D == Record) { 654 // The object for the anonymous struct/union directly 655 // follows its type in the list of declarations. 656 ++D; 657 assert(D != DEnd && "Missing object for anonymous record"); 658 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 659 return *D; 660 } 661 } 662 663 assert(false && "Missing object for anonymous record"); 664 return 0; 665} 666 667/// \brief Given a field that represents a member of an anonymous 668/// struct/union, build the path from that field's context to the 669/// actual member. 670/// 671/// Construct the sequence of field member references we'll have to 672/// perform to get to the field in the anonymous union/struct. The 673/// list of members is built from the field outward, so traverse it 674/// backwards to go from an object in the current context to the field 675/// we found. 676/// 677/// \returns The variable from which the field access should begin, 678/// for an anonymous struct/union that is not a member of another 679/// class. Otherwise, returns NULL. 680VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 681 llvm::SmallVectorImpl<FieldDecl *> &Path) { 682 assert(Field->getDeclContext()->isRecord() && 683 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 684 && "Field must be stored inside an anonymous struct or union"); 685 686 Path.push_back(Field); 687 VarDecl *BaseObject = 0; 688 DeclContext *Ctx = Field->getDeclContext(); 689 do { 690 RecordDecl *Record = cast<RecordDecl>(Ctx); 691 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 692 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 693 Path.push_back(AnonField); 694 else { 695 BaseObject = cast<VarDecl>(AnonObject); 696 break; 697 } 698 Ctx = Ctx->getParent(); 699 } while (Ctx->isRecord() && 700 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 701 702 return BaseObject; 703} 704 705Sema::OwningExprResult 706Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 707 FieldDecl *Field, 708 Expr *BaseObjectExpr, 709 SourceLocation OpLoc) { 710 llvm::SmallVector<FieldDecl *, 4> AnonFields; 711 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 712 AnonFields); 713 714 // Build the expression that refers to the base object, from 715 // which we will build a sequence of member references to each 716 // of the anonymous union objects and, eventually, the field we 717 // found via name lookup. 718 bool BaseObjectIsPointer = false; 719 unsigned ExtraQuals = 0; 720 if (BaseObject) { 721 // BaseObject is an anonymous struct/union variable (and is, 722 // therefore, not part of another non-anonymous record). 723 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 724 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 725 SourceLocation()); 726 ExtraQuals 727 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 728 } else if (BaseObjectExpr) { 729 // The caller provided the base object expression. Determine 730 // whether its a pointer and whether it adds any qualifiers to the 731 // anonymous struct/union fields we're looking into. 732 QualType ObjectType = BaseObjectExpr->getType(); 733 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 734 BaseObjectIsPointer = true; 735 ObjectType = ObjectPtr->getPointeeType(); 736 } 737 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 738 } else { 739 // We've found a member of an anonymous struct/union that is 740 // inside a non-anonymous struct/union, so in a well-formed 741 // program our base object expression is "this". 742 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 743 if (!MD->isStatic()) { 744 QualType AnonFieldType 745 = Context.getTagDeclType( 746 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 747 QualType ThisType = Context.getTagDeclType(MD->getParent()); 748 if ((Context.getCanonicalType(AnonFieldType) 749 == Context.getCanonicalType(ThisType)) || 750 IsDerivedFrom(ThisType, AnonFieldType)) { 751 // Our base object expression is "this". 752 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 753 MD->getThisType(Context)); 754 BaseObjectIsPointer = true; 755 } 756 } else { 757 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 758 << Field->getDeclName()); 759 } 760 ExtraQuals = MD->getTypeQualifiers(); 761 } 762 763 if (!BaseObjectExpr) 764 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 765 << Field->getDeclName()); 766 } 767 768 // Build the implicit member references to the field of the 769 // anonymous struct/union. 770 Expr *Result = BaseObjectExpr; 771 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 772 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 773 FI != FIEnd; ++FI) { 774 QualType MemberType = (*FI)->getType(); 775 if (!(*FI)->isMutable()) { 776 unsigned combinedQualifiers 777 = MemberType.getCVRQualifiers() | ExtraQuals; 778 MemberType = MemberType.getQualifiedType(combinedQualifiers); 779 } 780 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 781 OpLoc, MemberType); 782 BaseObjectIsPointer = false; 783 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 784 } 785 786 return Owned(Result); 787} 788 789/// ActOnDeclarationNameExpr - The parser has read some kind of name 790/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 791/// performs lookup on that name and returns an expression that refers 792/// to that name. This routine isn't directly called from the parser, 793/// because the parser doesn't know about DeclarationName. Rather, 794/// this routine is called by ActOnIdentifierExpr, 795/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 796/// which form the DeclarationName from the corresponding syntactic 797/// forms. 798/// 799/// HasTrailingLParen indicates whether this identifier is used in a 800/// function call context. LookupCtx is only used for a C++ 801/// qualified-id (foo::bar) to indicate the class or namespace that 802/// the identifier must be a member of. 803/// 804/// isAddressOfOperand means that this expression is the direct operand 805/// of an address-of operator. This matters because this is the only 806/// situation where a qualified name referencing a non-static member may 807/// appear outside a member function of this class. 808Sema::OwningExprResult 809Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 810 DeclarationName Name, bool HasTrailingLParen, 811 const CXXScopeSpec *SS, 812 bool isAddressOfOperand) { 813 // Could be enum-constant, value decl, instance variable, etc. 814 if (SS && SS->isInvalid()) 815 return ExprError(); 816 817 // C++ [temp.dep.expr]p3: 818 // An id-expression is type-dependent if it contains: 819 // -- a nested-name-specifier that contains a class-name that 820 // names a dependent type. 821 // FIXME: Member of the current instantiation. 822 if (SS && isDependentScopeSpecifier(*SS)) { 823 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 824 Loc, SS->getRange(), 825 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 826 } 827 828 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 829 false, true, Loc); 830 831 if (Lookup.isAmbiguous()) { 832 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 833 SS && SS->isSet() ? SS->getRange() 834 : SourceRange()); 835 return ExprError(); 836 } 837 838 NamedDecl *D = Lookup.getAsDecl(); 839 840 // If this reference is in an Objective-C method, then ivar lookup happens as 841 // well. 842 IdentifierInfo *II = Name.getAsIdentifierInfo(); 843 if (II && getCurMethodDecl()) { 844 // There are two cases to handle here. 1) scoped lookup could have failed, 845 // in which case we should look for an ivar. 2) scoped lookup could have 846 // found a decl, but that decl is outside the current instance method (i.e. 847 // a global variable). In these two cases, we do a lookup for an ivar with 848 // this name, if the lookup sucedes, we replace it our current decl. 849 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 850 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 851 ObjCInterfaceDecl *ClassDeclared; 852 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 853 ClassDeclared)) { 854 // Check if referencing a field with __attribute__((deprecated)). 855 if (DiagnoseUseOfDecl(IV, Loc)) 856 return ExprError(); 857 858 // If we're referencing an invalid decl, just return this as a silent 859 // error node. The error diagnostic was already emitted on the decl. 860 if (IV->isInvalidDecl()) 861 return ExprError(); 862 863 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 864 // If a class method attemps to use a free standing ivar, this is 865 // an error. 866 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 867 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 868 << IV->getDeclName()); 869 // If a class method uses a global variable, even if an ivar with 870 // same name exists, use the global. 871 if (!IsClsMethod) { 872 if (IV->getAccessControl() == ObjCIvarDecl::Private && 873 ClassDeclared != IFace) 874 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 875 // FIXME: This should use a new expr for a direct reference, don't 876 // turn this into Self->ivar, just return a BareIVarExpr or something. 877 IdentifierInfo &II = Context.Idents.get("self"); 878 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 879 return Owned(new (Context) 880 ObjCIvarRefExpr(IV, IV->getType(), Loc, 881 SelfExpr.takeAs<Expr>(), true, true)); 882 } 883 } 884 } 885 else if (getCurMethodDecl()->isInstanceMethod()) { 886 // We should warn if a local variable hides an ivar. 887 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 888 ObjCInterfaceDecl *ClassDeclared; 889 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 890 ClassDeclared)) { 891 if (IV->getAccessControl() != ObjCIvarDecl::Private || 892 IFace == ClassDeclared) 893 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 894 } 895 } 896 // Needed to implement property "super.method" notation. 897 if (D == 0 && II->isStr("super")) { 898 QualType T; 899 900 if (getCurMethodDecl()->isInstanceMethod()) 901 T = Context.getPointerType(Context.getObjCInterfaceType( 902 getCurMethodDecl()->getClassInterface())); 903 else 904 T = Context.getObjCClassType(); 905 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 906 } 907 } 908 909 // Determine whether this name might be a candidate for 910 // argument-dependent lookup. 911 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 912 HasTrailingLParen; 913 914 if (ADL && D == 0) { 915 // We've seen something of the form 916 // 917 // identifier( 918 // 919 // and we did not find any entity by the name 920 // "identifier". However, this identifier is still subject to 921 // argument-dependent lookup, so keep track of the name. 922 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 923 Context.OverloadTy, 924 Loc)); 925 } 926 927 if (D == 0) { 928 // Otherwise, this could be an implicitly declared function reference (legal 929 // in C90, extension in C99). 930 if (HasTrailingLParen && II && 931 !getLangOptions().CPlusPlus) // Not in C++. 932 D = ImplicitlyDefineFunction(Loc, *II, S); 933 else { 934 // If this name wasn't predeclared and if this is not a function call, 935 // diagnose the problem. 936 if (SS && !SS->isEmpty()) 937 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 938 << Name << SS->getRange()); 939 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 940 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 941 return ExprError(Diag(Loc, diag::err_undeclared_use) 942 << Name.getAsString()); 943 else 944 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 945 } 946 } 947 948 // If this is an expression of the form &Class::member, don't build an 949 // implicit member ref, because we want a pointer to the member in general, 950 // not any specific instance's member. 951 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 952 DeclContext *DC = computeDeclContext(*SS); 953 if (D && isa<CXXRecordDecl>(DC)) { 954 QualType DType; 955 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 956 DType = FD->getType().getNonReferenceType(); 957 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 958 DType = Method->getType(); 959 } else if (isa<OverloadedFunctionDecl>(D)) { 960 DType = Context.OverloadTy; 961 } 962 // Could be an inner type. That's diagnosed below, so ignore it here. 963 if (!DType.isNull()) { 964 // The pointer is type- and value-dependent if it points into something 965 // dependent. 966 bool Dependent = DC->isDependentContext(); 967 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 968 } 969 } 970 } 971 972 // We may have found a field within an anonymous union or struct 973 // (C++ [class.union]). 974 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 975 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 976 return BuildAnonymousStructUnionMemberReference(Loc, FD); 977 978 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 979 if (!MD->isStatic()) { 980 // C++ [class.mfct.nonstatic]p2: 981 // [...] if name lookup (3.4.1) resolves the name in the 982 // id-expression to a nonstatic nontype member of class X or of 983 // a base class of X, the id-expression is transformed into a 984 // class member access expression (5.2.5) using (*this) (9.3.2) 985 // as the postfix-expression to the left of the '.' operator. 986 DeclContext *Ctx = 0; 987 QualType MemberType; 988 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 989 Ctx = FD->getDeclContext(); 990 MemberType = FD->getType(); 991 992 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 993 MemberType = RefType->getPointeeType(); 994 else if (!FD->isMutable()) { 995 unsigned combinedQualifiers 996 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 997 MemberType = MemberType.getQualifiedType(combinedQualifiers); 998 } 999 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1000 if (!Method->isStatic()) { 1001 Ctx = Method->getParent(); 1002 MemberType = Method->getType(); 1003 } 1004 } else if (OverloadedFunctionDecl *Ovl 1005 = dyn_cast<OverloadedFunctionDecl>(D)) { 1006 for (OverloadedFunctionDecl::function_iterator 1007 Func = Ovl->function_begin(), 1008 FuncEnd = Ovl->function_end(); 1009 Func != FuncEnd; ++Func) { 1010 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1011 if (!DMethod->isStatic()) { 1012 Ctx = Ovl->getDeclContext(); 1013 MemberType = Context.OverloadTy; 1014 break; 1015 } 1016 } 1017 } 1018 1019 if (Ctx && Ctx->isRecord()) { 1020 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1021 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1022 if ((Context.getCanonicalType(CtxType) 1023 == Context.getCanonicalType(ThisType)) || 1024 IsDerivedFrom(ThisType, CtxType)) { 1025 // Build the implicit member access expression. 1026 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1027 MD->getThisType(Context)); 1028 return Owned(new (Context) MemberExpr(This, true, D, 1029 Loc, MemberType)); 1030 } 1031 } 1032 } 1033 } 1034 1035 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1036 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1037 if (MD->isStatic()) 1038 // "invalid use of member 'x' in static member function" 1039 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1040 << FD->getDeclName()); 1041 } 1042 1043 // Any other ways we could have found the field in a well-formed 1044 // program would have been turned into implicit member expressions 1045 // above. 1046 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1047 << FD->getDeclName()); 1048 } 1049 1050 if (isa<TypedefDecl>(D)) 1051 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1052 if (isa<ObjCInterfaceDecl>(D)) 1053 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1054 if (isa<NamespaceDecl>(D)) 1055 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1056 1057 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1058 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1059 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1060 false, false, SS)); 1061 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1062 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1063 false, false, SS)); 1064 ValueDecl *VD = cast<ValueDecl>(D); 1065 1066 // Check whether this declaration can be used. Note that we suppress 1067 // this check when we're going to perform argument-dependent lookup 1068 // on this function name, because this might not be the function 1069 // that overload resolution actually selects. 1070 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1071 return ExprError(); 1072 1073 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 1074 // Warn about constructs like: 1075 // if (void *X = foo()) { ... } else { X }. 1076 // In the else block, the pointer is always false. 1077 1078 // FIXME: In a template instantiation, we don't have scope 1079 // information to check this property. 1080 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 1081 Scope *CheckS = S; 1082 while (CheckS) { 1083 if (CheckS->isWithinElse() && 1084 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 1085 if (Var->getType()->isBooleanType()) 1086 ExprError(Diag(Loc, diag::warn_value_always_false) 1087 << Var->getDeclName()); 1088 else 1089 ExprError(Diag(Loc, diag::warn_value_always_zero) 1090 << Var->getDeclName()); 1091 break; 1092 } 1093 1094 // Move up one more control parent to check again. 1095 CheckS = CheckS->getControlParent(); 1096 if (CheckS) 1097 CheckS = CheckS->getParent(); 1098 } 1099 } 1100 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 1101 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1102 // C99 DR 316 says that, if a function type comes from a 1103 // function definition (without a prototype), that type is only 1104 // used for checking compatibility. Therefore, when referencing 1105 // the function, we pretend that we don't have the full function 1106 // type. 1107 QualType T = Func->getType(); 1108 QualType NoProtoType = T; 1109 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1110 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1111 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 1112 } 1113 } 1114 1115 // Only create DeclRefExpr's for valid Decl's. 1116 if (VD->isInvalidDecl()) 1117 return ExprError(); 1118 1119 // If the identifier reference is inside a block, and it refers to a value 1120 // that is outside the block, create a BlockDeclRefExpr instead of a 1121 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1122 // the block is formed. 1123 // 1124 // We do not do this for things like enum constants, global variables, etc, 1125 // as they do not get snapshotted. 1126 // 1127 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1128 QualType ExprTy = VD->getType().getNonReferenceType(); 1129 // The BlocksAttr indicates the variable is bound by-reference. 1130 if (VD->getAttr<BlocksAttr>()) 1131 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1132 1133 // Variable will be bound by-copy, make it const within the closure. 1134 ExprTy.addConst(); 1135 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 1136 } 1137 // If this reference is not in a block or if the referenced variable is 1138 // within the block, create a normal DeclRefExpr. 1139 1140 bool TypeDependent = false; 1141 bool ValueDependent = false; 1142 if (getLangOptions().CPlusPlus) { 1143 // C++ [temp.dep.expr]p3: 1144 // An id-expression is type-dependent if it contains: 1145 // - an identifier that was declared with a dependent type, 1146 if (VD->getType()->isDependentType()) 1147 TypeDependent = true; 1148 // - FIXME: a template-id that is dependent, 1149 // - a conversion-function-id that specifies a dependent type, 1150 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1151 Name.getCXXNameType()->isDependentType()) 1152 TypeDependent = true; 1153 // - a nested-name-specifier that contains a class-name that 1154 // names a dependent type. 1155 else if (SS && !SS->isEmpty()) { 1156 for (DeclContext *DC = computeDeclContext(*SS); 1157 DC; DC = DC->getParent()) { 1158 // FIXME: could stop early at namespace scope. 1159 if (DC->isRecord()) { 1160 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1161 if (Context.getTypeDeclType(Record)->isDependentType()) { 1162 TypeDependent = true; 1163 break; 1164 } 1165 } 1166 } 1167 } 1168 1169 // C++ [temp.dep.constexpr]p2: 1170 // 1171 // An identifier is value-dependent if it is: 1172 // - a name declared with a dependent type, 1173 if (TypeDependent) 1174 ValueDependent = true; 1175 // - the name of a non-type template parameter, 1176 else if (isa<NonTypeTemplateParmDecl>(VD)) 1177 ValueDependent = true; 1178 // - a constant with integral or enumeration type and is 1179 // initialized with an expression that is value-dependent 1180 // (FIXME!). 1181 } 1182 1183 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1184 TypeDependent, ValueDependent, SS)); 1185} 1186 1187Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1188 tok::TokenKind Kind) { 1189 PredefinedExpr::IdentType IT; 1190 1191 switch (Kind) { 1192 default: assert(0 && "Unknown simple primary expr!"); 1193 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1194 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1195 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1196 } 1197 1198 // Pre-defined identifiers are of type char[x], where x is the length of the 1199 // string. 1200 unsigned Length; 1201 if (FunctionDecl *FD = getCurFunctionDecl()) 1202 Length = FD->getIdentifier()->getLength(); 1203 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1204 Length = MD->getSynthesizedMethodSize(); 1205 else { 1206 Diag(Loc, diag::ext_predef_outside_function); 1207 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1208 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1209 } 1210 1211 1212 llvm::APInt LengthI(32, Length + 1); 1213 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1214 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1215 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1216} 1217 1218Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1219 llvm::SmallString<16> CharBuffer; 1220 CharBuffer.resize(Tok.getLength()); 1221 const char *ThisTokBegin = &CharBuffer[0]; 1222 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1223 1224 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1225 Tok.getLocation(), PP); 1226 if (Literal.hadError()) 1227 return ExprError(); 1228 1229 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1230 1231 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1232 Literal.isWide(), 1233 type, Tok.getLocation())); 1234} 1235 1236Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1237 // Fast path for a single digit (which is quite common). A single digit 1238 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1239 if (Tok.getLength() == 1) { 1240 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1241 unsigned IntSize = Context.Target.getIntWidth(); 1242 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1243 Context.IntTy, Tok.getLocation())); 1244 } 1245 1246 llvm::SmallString<512> IntegerBuffer; 1247 // Add padding so that NumericLiteralParser can overread by one character. 1248 IntegerBuffer.resize(Tok.getLength()+1); 1249 const char *ThisTokBegin = &IntegerBuffer[0]; 1250 1251 // Get the spelling of the token, which eliminates trigraphs, etc. 1252 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1253 1254 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1255 Tok.getLocation(), PP); 1256 if (Literal.hadError) 1257 return ExprError(); 1258 1259 Expr *Res; 1260 1261 if (Literal.isFloatingLiteral()) { 1262 QualType Ty; 1263 if (Literal.isFloat) 1264 Ty = Context.FloatTy; 1265 else if (!Literal.isLong) 1266 Ty = Context.DoubleTy; 1267 else 1268 Ty = Context.LongDoubleTy; 1269 1270 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1271 1272 // isExact will be set by GetFloatValue(). 1273 bool isExact = false; 1274 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1275 &isExact, Ty, Tok.getLocation()); 1276 1277 } else if (!Literal.isIntegerLiteral()) { 1278 return ExprError(); 1279 } else { 1280 QualType Ty; 1281 1282 // long long is a C99 feature. 1283 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1284 Literal.isLongLong) 1285 Diag(Tok.getLocation(), diag::ext_longlong); 1286 1287 // Get the value in the widest-possible width. 1288 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1289 1290 if (Literal.GetIntegerValue(ResultVal)) { 1291 // If this value didn't fit into uintmax_t, warn and force to ull. 1292 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1293 Ty = Context.UnsignedLongLongTy; 1294 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1295 "long long is not intmax_t?"); 1296 } else { 1297 // If this value fits into a ULL, try to figure out what else it fits into 1298 // according to the rules of C99 6.4.4.1p5. 1299 1300 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1301 // be an unsigned int. 1302 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1303 1304 // Check from smallest to largest, picking the smallest type we can. 1305 unsigned Width = 0; 1306 if (!Literal.isLong && !Literal.isLongLong) { 1307 // Are int/unsigned possibilities? 1308 unsigned IntSize = Context.Target.getIntWidth(); 1309 1310 // Does it fit in a unsigned int? 1311 if (ResultVal.isIntN(IntSize)) { 1312 // Does it fit in a signed int? 1313 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1314 Ty = Context.IntTy; 1315 else if (AllowUnsigned) 1316 Ty = Context.UnsignedIntTy; 1317 Width = IntSize; 1318 } 1319 } 1320 1321 // Are long/unsigned long possibilities? 1322 if (Ty.isNull() && !Literal.isLongLong) { 1323 unsigned LongSize = Context.Target.getLongWidth(); 1324 1325 // Does it fit in a unsigned long? 1326 if (ResultVal.isIntN(LongSize)) { 1327 // Does it fit in a signed long? 1328 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1329 Ty = Context.LongTy; 1330 else if (AllowUnsigned) 1331 Ty = Context.UnsignedLongTy; 1332 Width = LongSize; 1333 } 1334 } 1335 1336 // Finally, check long long if needed. 1337 if (Ty.isNull()) { 1338 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1339 1340 // Does it fit in a unsigned long long? 1341 if (ResultVal.isIntN(LongLongSize)) { 1342 // Does it fit in a signed long long? 1343 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1344 Ty = Context.LongLongTy; 1345 else if (AllowUnsigned) 1346 Ty = Context.UnsignedLongLongTy; 1347 Width = LongLongSize; 1348 } 1349 } 1350 1351 // If we still couldn't decide a type, we probably have something that 1352 // does not fit in a signed long long, but has no U suffix. 1353 if (Ty.isNull()) { 1354 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1355 Ty = Context.UnsignedLongLongTy; 1356 Width = Context.Target.getLongLongWidth(); 1357 } 1358 1359 if (ResultVal.getBitWidth() != Width) 1360 ResultVal.trunc(Width); 1361 } 1362 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1363 } 1364 1365 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1366 if (Literal.isImaginary) 1367 Res = new (Context) ImaginaryLiteral(Res, 1368 Context.getComplexType(Res->getType())); 1369 1370 return Owned(Res); 1371} 1372 1373Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1374 SourceLocation R, ExprArg Val) { 1375 Expr *E = Val.takeAs<Expr>(); 1376 assert((E != 0) && "ActOnParenExpr() missing expr"); 1377 return Owned(new (Context) ParenExpr(L, R, E)); 1378} 1379 1380/// The UsualUnaryConversions() function is *not* called by this routine. 1381/// See C99 6.3.2.1p[2-4] for more details. 1382bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1383 SourceLocation OpLoc, 1384 const SourceRange &ExprRange, 1385 bool isSizeof) { 1386 if (exprType->isDependentType()) 1387 return false; 1388 1389 // C99 6.5.3.4p1: 1390 if (isa<FunctionType>(exprType)) { 1391 // alignof(function) is allowed as an extension. 1392 if (isSizeof) 1393 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1394 return false; 1395 } 1396 1397 // Allow sizeof(void)/alignof(void) as an extension. 1398 if (exprType->isVoidType()) { 1399 Diag(OpLoc, diag::ext_sizeof_void_type) 1400 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1401 return false; 1402 } 1403 1404 if (RequireCompleteType(OpLoc, exprType, 1405 isSizeof ? diag::err_sizeof_incomplete_type : 1406 diag::err_alignof_incomplete_type, 1407 ExprRange)) 1408 return true; 1409 1410 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1411 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1412 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1413 << exprType << isSizeof << ExprRange; 1414 return true; 1415 } 1416 1417 return false; 1418} 1419 1420bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1421 const SourceRange &ExprRange) { 1422 E = E->IgnoreParens(); 1423 1424 // alignof decl is always ok. 1425 if (isa<DeclRefExpr>(E)) 1426 return false; 1427 1428 // Cannot know anything else if the expression is dependent. 1429 if (E->isTypeDependent()) 1430 return false; 1431 1432 if (E->getBitField()) { 1433 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1434 return true; 1435 } 1436 1437 // Alignment of a field access is always okay, so long as it isn't a 1438 // bit-field. 1439 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1440 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1441 return false; 1442 1443 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1444} 1445 1446/// \brief Build a sizeof or alignof expression given a type operand. 1447Action::OwningExprResult 1448Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1449 bool isSizeOf, SourceRange R) { 1450 if (T.isNull()) 1451 return ExprError(); 1452 1453 if (!T->isDependentType() && 1454 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1455 return ExprError(); 1456 1457 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1458 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1459 Context.getSizeType(), OpLoc, 1460 R.getEnd())); 1461} 1462 1463/// \brief Build a sizeof or alignof expression given an expression 1464/// operand. 1465Action::OwningExprResult 1466Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1467 bool isSizeOf, SourceRange R) { 1468 // Verify that the operand is valid. 1469 bool isInvalid = false; 1470 if (E->isTypeDependent()) { 1471 // Delay type-checking for type-dependent expressions. 1472 } else if (!isSizeOf) { 1473 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1474 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1475 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1476 isInvalid = true; 1477 } else { 1478 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1479 } 1480 1481 if (isInvalid) 1482 return ExprError(); 1483 1484 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1485 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1486 Context.getSizeType(), OpLoc, 1487 R.getEnd())); 1488} 1489 1490/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1491/// the same for @c alignof and @c __alignof 1492/// Note that the ArgRange is invalid if isType is false. 1493Action::OwningExprResult 1494Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1495 void *TyOrEx, const SourceRange &ArgRange) { 1496 // If error parsing type, ignore. 1497 if (TyOrEx == 0) return ExprError(); 1498 1499 if (isType) { 1500 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1501 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1502 } 1503 1504 // Get the end location. 1505 Expr *ArgEx = (Expr *)TyOrEx; 1506 Action::OwningExprResult Result 1507 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1508 1509 if (Result.isInvalid()) 1510 DeleteExpr(ArgEx); 1511 1512 return move(Result); 1513} 1514 1515QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1516 if (V->isTypeDependent()) 1517 return Context.DependentTy; 1518 1519 // These operators return the element type of a complex type. 1520 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1521 return CT->getElementType(); 1522 1523 // Otherwise they pass through real integer and floating point types here. 1524 if (V->getType()->isArithmeticType()) 1525 return V->getType(); 1526 1527 // Reject anything else. 1528 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1529 << (isReal ? "__real" : "__imag"); 1530 return QualType(); 1531} 1532 1533 1534 1535Action::OwningExprResult 1536Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1537 tok::TokenKind Kind, ExprArg Input) { 1538 Expr *Arg = (Expr *)Input.get(); 1539 1540 UnaryOperator::Opcode Opc; 1541 switch (Kind) { 1542 default: assert(0 && "Unknown unary op!"); 1543 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1544 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1545 } 1546 1547 if (getLangOptions().CPlusPlus && 1548 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1549 // Which overloaded operator? 1550 OverloadedOperatorKind OverOp = 1551 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1552 1553 // C++ [over.inc]p1: 1554 // 1555 // [...] If the function is a member function with one 1556 // parameter (which shall be of type int) or a non-member 1557 // function with two parameters (the second of which shall be 1558 // of type int), it defines the postfix increment operator ++ 1559 // for objects of that type. When the postfix increment is 1560 // called as a result of using the ++ operator, the int 1561 // argument will have value zero. 1562 Expr *Args[2] = { 1563 Arg, 1564 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1565 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1566 }; 1567 1568 // Build the candidate set for overloading 1569 OverloadCandidateSet CandidateSet; 1570 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1571 1572 // Perform overload resolution. 1573 OverloadCandidateSet::iterator Best; 1574 switch (BestViableFunction(CandidateSet, Best)) { 1575 case OR_Success: { 1576 // We found a built-in operator or an overloaded operator. 1577 FunctionDecl *FnDecl = Best->Function; 1578 1579 if (FnDecl) { 1580 // We matched an overloaded operator. Build a call to that 1581 // operator. 1582 1583 // Convert the arguments. 1584 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1585 if (PerformObjectArgumentInitialization(Arg, Method)) 1586 return ExprError(); 1587 } else { 1588 // Convert the arguments. 1589 if (PerformCopyInitialization(Arg, 1590 FnDecl->getParamDecl(0)->getType(), 1591 "passing")) 1592 return ExprError(); 1593 } 1594 1595 // Determine the result type 1596 QualType ResultTy 1597 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1598 ResultTy = ResultTy.getNonReferenceType(); 1599 1600 // Build the actual expression node. 1601 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1602 SourceLocation()); 1603 UsualUnaryConversions(FnExpr); 1604 1605 Input.release(); 1606 Args[0] = Arg; 1607 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1608 Args, 2, ResultTy, 1609 OpLoc)); 1610 } else { 1611 // We matched a built-in operator. Convert the arguments, then 1612 // break out so that we will build the appropriate built-in 1613 // operator node. 1614 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1615 "passing")) 1616 return ExprError(); 1617 1618 break; 1619 } 1620 } 1621 1622 case OR_No_Viable_Function: 1623 // No viable function; fall through to handling this as a 1624 // built-in operator, which will produce an error message for us. 1625 break; 1626 1627 case OR_Ambiguous: 1628 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1629 << UnaryOperator::getOpcodeStr(Opc) 1630 << Arg->getSourceRange(); 1631 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1632 return ExprError(); 1633 1634 case OR_Deleted: 1635 Diag(OpLoc, diag::err_ovl_deleted_oper) 1636 << Best->Function->isDeleted() 1637 << UnaryOperator::getOpcodeStr(Opc) 1638 << Arg->getSourceRange(); 1639 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1640 return ExprError(); 1641 } 1642 1643 // Either we found no viable overloaded operator or we matched a 1644 // built-in operator. In either case, fall through to trying to 1645 // build a built-in operation. 1646 } 1647 1648 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1649 Opc == UnaryOperator::PostInc); 1650 if (result.isNull()) 1651 return ExprError(); 1652 Input.release(); 1653 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1654} 1655 1656Action::OwningExprResult 1657Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1658 ExprArg Idx, SourceLocation RLoc) { 1659 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1660 *RHSExp = static_cast<Expr*>(Idx.get()); 1661 1662 if (getLangOptions().CPlusPlus && 1663 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1664 Base.release(); 1665 Idx.release(); 1666 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1667 Context.DependentTy, RLoc)); 1668 } 1669 1670 if (getLangOptions().CPlusPlus && 1671 (LHSExp->getType()->isRecordType() || 1672 LHSExp->getType()->isEnumeralType() || 1673 RHSExp->getType()->isRecordType() || 1674 RHSExp->getType()->isEnumeralType())) { 1675 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1676 // to the candidate set. 1677 OverloadCandidateSet CandidateSet; 1678 Expr *Args[2] = { LHSExp, RHSExp }; 1679 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1680 SourceRange(LLoc, RLoc)); 1681 1682 // Perform overload resolution. 1683 OverloadCandidateSet::iterator Best; 1684 switch (BestViableFunction(CandidateSet, Best)) { 1685 case OR_Success: { 1686 // We found a built-in operator or an overloaded operator. 1687 FunctionDecl *FnDecl = Best->Function; 1688 1689 if (FnDecl) { 1690 // We matched an overloaded operator. Build a call to that 1691 // operator. 1692 1693 // Convert the arguments. 1694 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1695 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1696 PerformCopyInitialization(RHSExp, 1697 FnDecl->getParamDecl(0)->getType(), 1698 "passing")) 1699 return ExprError(); 1700 } else { 1701 // Convert the arguments. 1702 if (PerformCopyInitialization(LHSExp, 1703 FnDecl->getParamDecl(0)->getType(), 1704 "passing") || 1705 PerformCopyInitialization(RHSExp, 1706 FnDecl->getParamDecl(1)->getType(), 1707 "passing")) 1708 return ExprError(); 1709 } 1710 1711 // Determine the result type 1712 QualType ResultTy 1713 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1714 ResultTy = ResultTy.getNonReferenceType(); 1715 1716 // Build the actual expression node. 1717 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1718 SourceLocation()); 1719 UsualUnaryConversions(FnExpr); 1720 1721 Base.release(); 1722 Idx.release(); 1723 Args[0] = LHSExp; 1724 Args[1] = RHSExp; 1725 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1726 FnExpr, Args, 2, 1727 ResultTy, LLoc)); 1728 } else { 1729 // We matched a built-in operator. Convert the arguments, then 1730 // break out so that we will build the appropriate built-in 1731 // operator node. 1732 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1733 "passing") || 1734 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1735 "passing")) 1736 return ExprError(); 1737 1738 break; 1739 } 1740 } 1741 1742 case OR_No_Viable_Function: 1743 // No viable function; fall through to handling this as a 1744 // built-in operator, which will produce an error message for us. 1745 break; 1746 1747 case OR_Ambiguous: 1748 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1749 << "[]" 1750 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1751 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1752 return ExprError(); 1753 1754 case OR_Deleted: 1755 Diag(LLoc, diag::err_ovl_deleted_oper) 1756 << Best->Function->isDeleted() 1757 << "[]" 1758 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1759 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1760 return ExprError(); 1761 } 1762 1763 // Either we found no viable overloaded operator or we matched a 1764 // built-in operator. In either case, fall through to trying to 1765 // build a built-in operation. 1766 } 1767 1768 // Perform default conversions. 1769 DefaultFunctionArrayConversion(LHSExp); 1770 DefaultFunctionArrayConversion(RHSExp); 1771 1772 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1773 1774 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1775 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1776 // in the subscript position. As a result, we need to derive the array base 1777 // and index from the expression types. 1778 Expr *BaseExpr, *IndexExpr; 1779 QualType ResultType; 1780 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1781 BaseExpr = LHSExp; 1782 IndexExpr = RHSExp; 1783 ResultType = Context.DependentTy; 1784 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1785 BaseExpr = LHSExp; 1786 IndexExpr = RHSExp; 1787 ResultType = PTy->getPointeeType(); 1788 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1789 // Handle the uncommon case of "123[Ptr]". 1790 BaseExpr = RHSExp; 1791 IndexExpr = LHSExp; 1792 ResultType = PTy->getPointeeType(); 1793 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1794 BaseExpr = LHSExp; // vectors: V[123] 1795 IndexExpr = RHSExp; 1796 1797 // FIXME: need to deal with const... 1798 ResultType = VTy->getElementType(); 1799 } else if (LHSTy->isArrayType()) { 1800 // If we see an array that wasn't promoted by 1801 // DefaultFunctionArrayConversion, it must be an array that 1802 // wasn't promoted because of the C90 rule that doesn't 1803 // allow promoting non-lvalue arrays. Warn, then 1804 // force the promotion here. 1805 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1806 LHSExp->getSourceRange(); 1807 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1808 LHSTy = LHSExp->getType(); 1809 1810 BaseExpr = LHSExp; 1811 IndexExpr = RHSExp; 1812 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1813 } else if (RHSTy->isArrayType()) { 1814 // Same as previous, except for 123[f().a] case 1815 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1816 RHSExp->getSourceRange(); 1817 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1818 RHSTy = RHSExp->getType(); 1819 1820 BaseExpr = RHSExp; 1821 IndexExpr = LHSExp; 1822 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1823 } else { 1824 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1825 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1826 } 1827 // C99 6.5.2.1p1 1828 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1829 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1830 << IndexExpr->getSourceRange()); 1831 1832 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1833 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1834 // type. Note that Functions are not objects, and that (in C99 parlance) 1835 // incomplete types are not object types. 1836 if (ResultType->isFunctionType()) { 1837 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1838 << ResultType << BaseExpr->getSourceRange(); 1839 return ExprError(); 1840 } 1841 1842 if (!ResultType->isDependentType() && 1843 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1844 BaseExpr->getSourceRange())) 1845 return ExprError(); 1846 1847 // Diagnose bad cases where we step over interface counts. 1848 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1849 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1850 << ResultType << BaseExpr->getSourceRange(); 1851 return ExprError(); 1852 } 1853 1854 Base.release(); 1855 Idx.release(); 1856 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1857 ResultType, RLoc)); 1858} 1859 1860QualType Sema:: 1861CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1862 IdentifierInfo &CompName, SourceLocation CompLoc) { 1863 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1864 1865 // The vector accessor can't exceed the number of elements. 1866 const char *compStr = CompName.getName(); 1867 1868 // This flag determines whether or not the component is one of the four 1869 // special names that indicate a subset of exactly half the elements are 1870 // to be selected. 1871 bool HalvingSwizzle = false; 1872 1873 // This flag determines whether or not CompName has an 's' char prefix, 1874 // indicating that it is a string of hex values to be used as vector indices. 1875 bool HexSwizzle = *compStr == 's'; 1876 1877 // Check that we've found one of the special components, or that the component 1878 // names must come from the same set. 1879 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1880 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1881 HalvingSwizzle = true; 1882 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1883 do 1884 compStr++; 1885 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1886 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1887 do 1888 compStr++; 1889 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1890 } 1891 1892 if (!HalvingSwizzle && *compStr) { 1893 // We didn't get to the end of the string. This means the component names 1894 // didn't come from the same set *or* we encountered an illegal name. 1895 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1896 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1897 return QualType(); 1898 } 1899 1900 // Ensure no component accessor exceeds the width of the vector type it 1901 // operates on. 1902 if (!HalvingSwizzle) { 1903 compStr = CompName.getName(); 1904 1905 if (HexSwizzle) 1906 compStr++; 1907 1908 while (*compStr) { 1909 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1910 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1911 << baseType << SourceRange(CompLoc); 1912 return QualType(); 1913 } 1914 } 1915 } 1916 1917 // If this is a halving swizzle, verify that the base type has an even 1918 // number of elements. 1919 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1920 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1921 << baseType << SourceRange(CompLoc); 1922 return QualType(); 1923 } 1924 1925 // The component accessor looks fine - now we need to compute the actual type. 1926 // The vector type is implied by the component accessor. For example, 1927 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1928 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1929 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1930 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1931 : CompName.getLength(); 1932 if (HexSwizzle) 1933 CompSize--; 1934 1935 if (CompSize == 1) 1936 return vecType->getElementType(); 1937 1938 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1939 // Now look up the TypeDefDecl from the vector type. Without this, 1940 // diagostics look bad. We want extended vector types to appear built-in. 1941 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1942 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1943 return Context.getTypedefType(ExtVectorDecls[i]); 1944 } 1945 return VT; // should never get here (a typedef type should always be found). 1946} 1947 1948static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1949 IdentifierInfo &Member, 1950 const Selector &Sel, 1951 ASTContext &Context) { 1952 1953 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1954 return PD; 1955 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1956 return OMD; 1957 1958 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1959 E = PDecl->protocol_end(); I != E; ++I) { 1960 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1961 Context)) 1962 return D; 1963 } 1964 return 0; 1965} 1966 1967static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1968 IdentifierInfo &Member, 1969 const Selector &Sel, 1970 ASTContext &Context) { 1971 // Check protocols on qualified interfaces. 1972 Decl *GDecl = 0; 1973 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1974 E = QIdTy->qual_end(); I != E; ++I) { 1975 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1976 GDecl = PD; 1977 break; 1978 } 1979 // Also must look for a getter name which uses property syntax. 1980 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1981 GDecl = OMD; 1982 break; 1983 } 1984 } 1985 if (!GDecl) { 1986 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1987 E = QIdTy->qual_end(); I != E; ++I) { 1988 // Search in the protocol-qualifier list of current protocol. 1989 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1990 if (GDecl) 1991 return GDecl; 1992 } 1993 } 1994 return GDecl; 1995} 1996 1997/// FindMethodInNestedImplementations - Look up a method in current and 1998/// all base class implementations. 1999/// 2000ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2001 const ObjCInterfaceDecl *IFace, 2002 const Selector &Sel) { 2003 ObjCMethodDecl *Method = 0; 2004 if (ObjCImplementationDecl *ImpDecl 2005 = LookupObjCImplementation(IFace->getIdentifier())) 2006 Method = ImpDecl->getInstanceMethod(Context, Sel); 2007 2008 if (!Method && IFace->getSuperClass()) 2009 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2010 return Method; 2011} 2012 2013Action::OwningExprResult 2014Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2015 tok::TokenKind OpKind, SourceLocation MemberLoc, 2016 IdentifierInfo &Member, 2017 DeclPtrTy ObjCImpDecl) { 2018 Expr *BaseExpr = Base.takeAs<Expr>(); 2019 assert(BaseExpr && "no record expression"); 2020 2021 // Perform default conversions. 2022 DefaultFunctionArrayConversion(BaseExpr); 2023 2024 QualType BaseType = BaseExpr->getType(); 2025 assert(!BaseType.isNull() && "no type for member expression"); 2026 2027 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2028 // must have pointer type, and the accessed type is the pointee. 2029 if (OpKind == tok::arrow) { 2030 if (BaseType->isDependentType()) 2031 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2032 BaseExpr, true, 2033 OpLoc, 2034 DeclarationName(&Member), 2035 MemberLoc)); 2036 else if (const PointerType *PT = BaseType->getAsPointerType()) 2037 BaseType = PT->getPointeeType(); 2038 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2039 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2040 MemberLoc, Member)); 2041 else 2042 return ExprError(Diag(MemberLoc, 2043 diag::err_typecheck_member_reference_arrow) 2044 << BaseType << BaseExpr->getSourceRange()); 2045 } else { 2046 if (BaseType->isDependentType()) { 2047 // Require that the base type isn't a pointer type 2048 // (so we'll report an error for) 2049 // T* t; 2050 // t.f; 2051 // 2052 // In Obj-C++, however, the above expression is valid, since it could be 2053 // accessing the 'f' property if T is an Obj-C interface. The extra check 2054 // allows this, while still reporting an error if T is a struct pointer. 2055 const PointerType *PT = BaseType->getAsPointerType(); 2056 2057 if (!PT || (getLangOptions().ObjC1 && 2058 !PT->getPointeeType()->isRecordType())) 2059 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2060 BaseExpr, false, 2061 OpLoc, 2062 DeclarationName(&Member), 2063 MemberLoc)); 2064 } 2065 } 2066 2067 // Handle field access to simple records. This also handles access to fields 2068 // of the ObjC 'id' struct. 2069 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2070 RecordDecl *RDecl = RTy->getDecl(); 2071 if (RequireCompleteType(OpLoc, BaseType, 2072 diag::err_typecheck_incomplete_tag, 2073 BaseExpr->getSourceRange())) 2074 return ExprError(); 2075 2076 // The record definition is complete, now make sure the member is valid. 2077 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2078 LookupResult Result 2079 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2080 LookupMemberName, false); 2081 2082 if (!Result) 2083 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2084 << &Member << BaseExpr->getSourceRange()); 2085 if (Result.isAmbiguous()) { 2086 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2087 MemberLoc, BaseExpr->getSourceRange()); 2088 return ExprError(); 2089 } 2090 2091 NamedDecl *MemberDecl = Result; 2092 2093 // If the decl being referenced had an error, return an error for this 2094 // sub-expr without emitting another error, in order to avoid cascading 2095 // error cases. 2096 if (MemberDecl->isInvalidDecl()) 2097 return ExprError(); 2098 2099 // Check the use of this field 2100 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2101 return ExprError(); 2102 2103 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2104 // We may have found a field within an anonymous union or struct 2105 // (C++ [class.union]). 2106 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2107 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2108 BaseExpr, OpLoc); 2109 2110 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2111 // FIXME: Handle address space modifiers 2112 QualType MemberType = FD->getType(); 2113 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2114 MemberType = Ref->getPointeeType(); 2115 else { 2116 unsigned combinedQualifiers = 2117 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2118 if (FD->isMutable()) 2119 combinedQualifiers &= ~QualType::Const; 2120 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2121 } 2122 2123 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2124 MemberLoc, MemberType)); 2125 } 2126 2127 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 2128 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2129 Var, MemberLoc, 2130 Var->getType().getNonReferenceType())); 2131 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 2132 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2133 MemberFn, MemberLoc, 2134 MemberFn->getType())); 2135 if (OverloadedFunctionDecl *Ovl 2136 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2137 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2138 MemberLoc, Context.OverloadTy)); 2139 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 2140 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2141 Enum, MemberLoc, Enum->getType())); 2142 if (isa<TypeDecl>(MemberDecl)) 2143 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2144 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2145 2146 // We found a declaration kind that we didn't expect. This is a 2147 // generic error message that tells the user that she can't refer 2148 // to this member with '.' or '->'. 2149 return ExprError(Diag(MemberLoc, 2150 diag::err_typecheck_member_reference_unknown) 2151 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2152 } 2153 2154 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2155 // (*Obj).ivar. 2156 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2157 ObjCInterfaceDecl *ClassDeclared; 2158 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2159 &Member, 2160 ClassDeclared)) { 2161 // If the decl being referenced had an error, return an error for this 2162 // sub-expr without emitting another error, in order to avoid cascading 2163 // error cases. 2164 if (IV->isInvalidDecl()) 2165 return ExprError(); 2166 2167 // Check whether we can reference this field. 2168 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2169 return ExprError(); 2170 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2171 IV->getAccessControl() != ObjCIvarDecl::Package) { 2172 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2173 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2174 ClassOfMethodDecl = MD->getClassInterface(); 2175 else if (ObjCImpDecl && getCurFunctionDecl()) { 2176 // Case of a c-function declared inside an objc implementation. 2177 // FIXME: For a c-style function nested inside an objc implementation 2178 // class, there is no implementation context available, so we pass 2179 // down the context as argument to this routine. Ideally, this context 2180 // need be passed down in the AST node and somehow calculated from the 2181 // AST for a function decl. 2182 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2183 if (ObjCImplementationDecl *IMPD = 2184 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2185 ClassOfMethodDecl = IMPD->getClassInterface(); 2186 else if (ObjCCategoryImplDecl* CatImplClass = 2187 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2188 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2189 } 2190 2191 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2192 if (ClassDeclared != IFTy->getDecl() || 2193 ClassOfMethodDecl != ClassDeclared) 2194 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2195 } 2196 // @protected 2197 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2198 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2199 } 2200 2201 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2202 MemberLoc, BaseExpr, 2203 OpKind == tok::arrow)); 2204 } 2205 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2206 << IFTy->getDecl()->getDeclName() << &Member 2207 << BaseExpr->getSourceRange()); 2208 } 2209 2210 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2211 // pointer to a (potentially qualified) interface type. 2212 const PointerType *PTy; 2213 const ObjCInterfaceType *IFTy; 2214 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2215 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2216 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2217 2218 // Search for a declared property first. 2219 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2220 &Member)) { 2221 // Check whether we can reference this property. 2222 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2223 return ExprError(); 2224 QualType ResTy = PD->getType(); 2225 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2226 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2227 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2228 ResTy = Getter->getResultType(); 2229 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2230 MemberLoc, BaseExpr)); 2231 } 2232 2233 // Check protocols on qualified interfaces. 2234 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2235 E = IFTy->qual_end(); I != E; ++I) 2236 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2237 &Member)) { 2238 // Check whether we can reference this property. 2239 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2240 return ExprError(); 2241 2242 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2243 MemberLoc, BaseExpr)); 2244 } 2245 2246 // If that failed, look for an "implicit" property by seeing if the nullary 2247 // selector is implemented. 2248 2249 // FIXME: The logic for looking up nullary and unary selectors should be 2250 // shared with the code in ActOnInstanceMessage. 2251 2252 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2253 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2254 2255 // If this reference is in an @implementation, check for 'private' methods. 2256 if (!Getter) 2257 Getter = FindMethodInNestedImplementations(IFace, Sel); 2258 2259 // Look through local category implementations associated with the class. 2260 if (!Getter) { 2261 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2262 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2263 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2264 } 2265 } 2266 if (Getter) { 2267 // Check if we can reference this property. 2268 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2269 return ExprError(); 2270 } 2271 // If we found a getter then this may be a valid dot-reference, we 2272 // will look for the matching setter, in case it is needed. 2273 Selector SetterSel = 2274 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2275 PP.getSelectorTable(), &Member); 2276 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2277 if (!Setter) { 2278 // If this reference is in an @implementation, also check for 'private' 2279 // methods. 2280 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2281 } 2282 // Look through local category implementations associated with the class. 2283 if (!Setter) { 2284 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2285 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2286 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2287 } 2288 } 2289 2290 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2291 return ExprError(); 2292 2293 if (Getter || Setter) { 2294 QualType PType; 2295 2296 if (Getter) 2297 PType = Getter->getResultType(); 2298 else { 2299 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2300 E = Setter->param_end(); PI != E; ++PI) 2301 PType = (*PI)->getType(); 2302 } 2303 // FIXME: we must check that the setter has property type. 2304 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2305 Setter, MemberLoc, BaseExpr)); 2306 } 2307 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2308 << &Member << BaseType); 2309 } 2310 // Handle properties on qualified "id" protocols. 2311 const ObjCQualifiedIdType *QIdTy; 2312 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2313 // Check protocols on qualified interfaces. 2314 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2315 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2316 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2317 // Check the use of this declaration 2318 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2319 return ExprError(); 2320 2321 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2322 MemberLoc, BaseExpr)); 2323 } 2324 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2325 // Check the use of this method. 2326 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2327 return ExprError(); 2328 2329 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2330 OMD->getResultType(), 2331 OMD, OpLoc, MemberLoc, 2332 NULL, 0)); 2333 } 2334 } 2335 2336 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2337 << &Member << BaseType); 2338 } 2339 // Handle properties on ObjC 'Class' types. 2340 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2341 // Also must look for a getter name which uses property syntax. 2342 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2343 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2344 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2345 ObjCMethodDecl *Getter; 2346 // FIXME: need to also look locally in the implementation. 2347 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2348 // Check the use of this method. 2349 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2350 return ExprError(); 2351 } 2352 // If we found a getter then this may be a valid dot-reference, we 2353 // will look for the matching setter, in case it is needed. 2354 Selector SetterSel = 2355 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2356 PP.getSelectorTable(), &Member); 2357 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2358 if (!Setter) { 2359 // If this reference is in an @implementation, also check for 'private' 2360 // methods. 2361 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2362 } 2363 // Look through local category implementations associated with the class. 2364 if (!Setter) { 2365 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2366 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2367 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2368 } 2369 } 2370 2371 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2372 return ExprError(); 2373 2374 if (Getter || Setter) { 2375 QualType PType; 2376 2377 if (Getter) 2378 PType = Getter->getResultType(); 2379 else { 2380 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2381 E = Setter->param_end(); PI != E; ++PI) 2382 PType = (*PI)->getType(); 2383 } 2384 // FIXME: we must check that the setter has property type. 2385 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2386 Setter, MemberLoc, BaseExpr)); 2387 } 2388 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2389 << &Member << BaseType); 2390 } 2391 } 2392 2393 // Handle 'field access' to vectors, such as 'V.xx'. 2394 if (BaseType->isExtVectorType()) { 2395 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2396 if (ret.isNull()) 2397 return ExprError(); 2398 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2399 MemberLoc)); 2400 } 2401 2402 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2403 << BaseType << BaseExpr->getSourceRange(); 2404 2405 // If the user is trying to apply -> or . to a function or function 2406 // pointer, it's probably because they forgot parentheses to call 2407 // the function. Suggest the addition of those parentheses. 2408 if (BaseType == Context.OverloadTy || 2409 BaseType->isFunctionType() || 2410 (BaseType->isPointerType() && 2411 BaseType->getAsPointerType()->isFunctionType())) { 2412 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2413 Diag(Loc, diag::note_member_reference_needs_call) 2414 << CodeModificationHint::CreateInsertion(Loc, "()"); 2415 } 2416 2417 return ExprError(); 2418} 2419 2420/// ConvertArgumentsForCall - Converts the arguments specified in 2421/// Args/NumArgs to the parameter types of the function FDecl with 2422/// function prototype Proto. Call is the call expression itself, and 2423/// Fn is the function expression. For a C++ member function, this 2424/// routine does not attempt to convert the object argument. Returns 2425/// true if the call is ill-formed. 2426bool 2427Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2428 FunctionDecl *FDecl, 2429 const FunctionProtoType *Proto, 2430 Expr **Args, unsigned NumArgs, 2431 SourceLocation RParenLoc) { 2432 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2433 // assignment, to the types of the corresponding parameter, ... 2434 unsigned NumArgsInProto = Proto->getNumArgs(); 2435 unsigned NumArgsToCheck = NumArgs; 2436 bool Invalid = false; 2437 2438 // If too few arguments are available (and we don't have default 2439 // arguments for the remaining parameters), don't make the call. 2440 if (NumArgs < NumArgsInProto) { 2441 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2442 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2443 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2444 // Use default arguments for missing arguments 2445 NumArgsToCheck = NumArgsInProto; 2446 Call->setNumArgs(Context, NumArgsInProto); 2447 } 2448 2449 // If too many are passed and not variadic, error on the extras and drop 2450 // them. 2451 if (NumArgs > NumArgsInProto) { 2452 if (!Proto->isVariadic()) { 2453 Diag(Args[NumArgsInProto]->getLocStart(), 2454 diag::err_typecheck_call_too_many_args) 2455 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2456 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2457 Args[NumArgs-1]->getLocEnd()); 2458 // This deletes the extra arguments. 2459 Call->setNumArgs(Context, NumArgsInProto); 2460 Invalid = true; 2461 } 2462 NumArgsToCheck = NumArgsInProto; 2463 } 2464 2465 // Continue to check argument types (even if we have too few/many args). 2466 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2467 QualType ProtoArgType = Proto->getArgType(i); 2468 2469 Expr *Arg; 2470 if (i < NumArgs) { 2471 Arg = Args[i]; 2472 2473 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2474 ProtoArgType, 2475 diag::err_call_incomplete_argument, 2476 Arg->getSourceRange())) 2477 return true; 2478 2479 // Pass the argument. 2480 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2481 return true; 2482 } else 2483 // We already type-checked the argument, so we know it works. 2484 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2485 QualType ArgType = Arg->getType(); 2486 2487 Call->setArg(i, Arg); 2488 } 2489 2490 // If this is a variadic call, handle args passed through "...". 2491 if (Proto->isVariadic()) { 2492 VariadicCallType CallType = VariadicFunction; 2493 if (Fn->getType()->isBlockPointerType()) 2494 CallType = VariadicBlock; // Block 2495 else if (isa<MemberExpr>(Fn)) 2496 CallType = VariadicMethod; 2497 2498 // Promote the arguments (C99 6.5.2.2p7). 2499 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2500 Expr *Arg = Args[i]; 2501 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2502 Call->setArg(i, Arg); 2503 } 2504 } 2505 2506 return Invalid; 2507} 2508 2509/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2510/// This provides the location of the left/right parens and a list of comma 2511/// locations. 2512Action::OwningExprResult 2513Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2514 MultiExprArg args, 2515 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2516 unsigned NumArgs = args.size(); 2517 Expr *Fn = fn.takeAs<Expr>(); 2518 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2519 assert(Fn && "no function call expression"); 2520 FunctionDecl *FDecl = NULL; 2521 NamedDecl *NDecl = NULL; 2522 DeclarationName UnqualifiedName; 2523 2524 if (getLangOptions().CPlusPlus) { 2525 // Determine whether this is a dependent call inside a C++ template, 2526 // in which case we won't do any semantic analysis now. 2527 // FIXME: Will need to cache the results of name lookup (including ADL) in 2528 // Fn. 2529 bool Dependent = false; 2530 if (Fn->isTypeDependent()) 2531 Dependent = true; 2532 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2533 Dependent = true; 2534 2535 if (Dependent) 2536 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2537 Context.DependentTy, RParenLoc)); 2538 2539 // Determine whether this is a call to an object (C++ [over.call.object]). 2540 if (Fn->getType()->isRecordType()) 2541 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2542 CommaLocs, RParenLoc)); 2543 2544 // Determine whether this is a call to a member function. 2545 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2546 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2547 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2548 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2549 CommaLocs, RParenLoc)); 2550 } 2551 2552 // If we're directly calling a function, get the appropriate declaration. 2553 DeclRefExpr *DRExpr = NULL; 2554 Expr *FnExpr = Fn; 2555 bool ADL = true; 2556 while (true) { 2557 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2558 FnExpr = IcExpr->getSubExpr(); 2559 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2560 // Parentheses around a function disable ADL 2561 // (C++0x [basic.lookup.argdep]p1). 2562 ADL = false; 2563 FnExpr = PExpr->getSubExpr(); 2564 } else if (isa<UnaryOperator>(FnExpr) && 2565 cast<UnaryOperator>(FnExpr)->getOpcode() 2566 == UnaryOperator::AddrOf) { 2567 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2568 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2569 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2570 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2571 break; 2572 } else if (UnresolvedFunctionNameExpr *DepName 2573 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2574 UnqualifiedName = DepName->getName(); 2575 break; 2576 } else { 2577 // Any kind of name that does not refer to a declaration (or 2578 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2579 ADL = false; 2580 break; 2581 } 2582 } 2583 2584 OverloadedFunctionDecl *Ovl = 0; 2585 if (DRExpr) { 2586 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2587 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2588 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2589 } 2590 2591 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2592 // We don't perform ADL for implicit declarations of builtins. 2593 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2594 ADL = false; 2595 2596 // We don't perform ADL in C. 2597 if (!getLangOptions().CPlusPlus) 2598 ADL = false; 2599 2600 if (Ovl || ADL) { 2601 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2602 UnqualifiedName, LParenLoc, Args, 2603 NumArgs, CommaLocs, RParenLoc, ADL); 2604 if (!FDecl) 2605 return ExprError(); 2606 2607 // Update Fn to refer to the actual function selected. 2608 Expr *NewFn = 0; 2609 if (QualifiedDeclRefExpr *QDRExpr 2610 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2611 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2612 QDRExpr->getLocation(), 2613 false, false, 2614 QDRExpr->getQualifierRange(), 2615 QDRExpr->getQualifier()); 2616 else 2617 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2618 Fn->getSourceRange().getBegin()); 2619 Fn->Destroy(Context); 2620 Fn = NewFn; 2621 } 2622 } 2623 2624 // Promote the function operand. 2625 UsualUnaryConversions(Fn); 2626 2627 // Make the call expr early, before semantic checks. This guarantees cleanup 2628 // of arguments and function on error. 2629 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2630 Args, NumArgs, 2631 Context.BoolTy, 2632 RParenLoc)); 2633 2634 const FunctionType *FuncT; 2635 if (!Fn->getType()->isBlockPointerType()) { 2636 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2637 // have type pointer to function". 2638 const PointerType *PT = Fn->getType()->getAsPointerType(); 2639 if (PT == 0) 2640 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2641 << Fn->getType() << Fn->getSourceRange()); 2642 FuncT = PT->getPointeeType()->getAsFunctionType(); 2643 } else { // This is a block call. 2644 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2645 getAsFunctionType(); 2646 } 2647 if (FuncT == 0) 2648 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2649 << Fn->getType() << Fn->getSourceRange()); 2650 2651 // Check for a valid return type 2652 if (!FuncT->getResultType()->isVoidType() && 2653 RequireCompleteType(Fn->getSourceRange().getBegin(), 2654 FuncT->getResultType(), 2655 diag::err_call_incomplete_return, 2656 TheCall->getSourceRange())) 2657 return ExprError(); 2658 2659 // We know the result type of the call, set it. 2660 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2661 2662 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2663 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2664 RParenLoc)) 2665 return ExprError(); 2666 } else { 2667 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2668 2669 if (FDecl) { 2670 // Check if we have too few/too many template arguments, based 2671 // on our knowledge of the function definition. 2672 const FunctionDecl *Def = 0; 2673 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) { 2674 const FunctionProtoType *Proto = 2675 Def->getType()->getAsFunctionProtoType(); 2676 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2677 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2678 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2679 } 2680 } 2681 } 2682 2683 // Promote the arguments (C99 6.5.2.2p6). 2684 for (unsigned i = 0; i != NumArgs; i++) { 2685 Expr *Arg = Args[i]; 2686 DefaultArgumentPromotion(Arg); 2687 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2688 Arg->getType(), 2689 diag::err_call_incomplete_argument, 2690 Arg->getSourceRange())) 2691 return ExprError(); 2692 TheCall->setArg(i, Arg); 2693 } 2694 } 2695 2696 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2697 if (!Method->isStatic()) 2698 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2699 << Fn->getSourceRange()); 2700 2701 // Check for sentinels 2702 if (NDecl) 2703 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2704 // Do special checking on direct calls to functions. 2705 if (FDecl) 2706 return CheckFunctionCall(FDecl, TheCall.take()); 2707 if (NDecl) 2708 return CheckBlockCall(NDecl, TheCall.take()); 2709 2710 return Owned(TheCall.take()); 2711} 2712 2713Action::OwningExprResult 2714Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2715 SourceLocation RParenLoc, ExprArg InitExpr) { 2716 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2717 QualType literalType = QualType::getFromOpaquePtr(Ty); 2718 // FIXME: put back this assert when initializers are worked out. 2719 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2720 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2721 2722 if (literalType->isArrayType()) { 2723 if (literalType->isVariableArrayType()) 2724 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2725 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2726 } else if (!literalType->isDependentType() && 2727 RequireCompleteType(LParenLoc, literalType, 2728 diag::err_typecheck_decl_incomplete_type, 2729 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2730 return ExprError(); 2731 2732 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2733 DeclarationName(), /*FIXME:DirectInit=*/false)) 2734 return ExprError(); 2735 2736 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2737 if (isFileScope) { // 6.5.2.5p3 2738 if (CheckForConstantInitializer(literalExpr, literalType)) 2739 return ExprError(); 2740 } 2741 InitExpr.release(); 2742 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2743 literalExpr, isFileScope)); 2744} 2745 2746Action::OwningExprResult 2747Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2748 SourceLocation RBraceLoc) { 2749 unsigned NumInit = initlist.size(); 2750 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2751 2752 // Semantic analysis for initializers is done by ActOnDeclarator() and 2753 // CheckInitializer() - it requires knowledge of the object being intialized. 2754 2755 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2756 RBraceLoc); 2757 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2758 return Owned(E); 2759} 2760 2761/// CheckCastTypes - Check type constraints for casting between types. 2762bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2763 UsualUnaryConversions(castExpr); 2764 2765 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2766 // type needs to be scalar. 2767 if (castType->isVoidType()) { 2768 // Cast to void allows any expr type. 2769 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2770 // We can't check any more until template instantiation time. 2771 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2772 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2773 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2774 (castType->isStructureType() || castType->isUnionType())) { 2775 // GCC struct/union extension: allow cast to self. 2776 // FIXME: Check that the cast destination type is complete. 2777 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2778 << castType << castExpr->getSourceRange(); 2779 } else if (castType->isUnionType()) { 2780 // GCC cast to union extension 2781 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2782 RecordDecl::field_iterator Field, FieldEnd; 2783 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2784 Field != FieldEnd; ++Field) { 2785 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2786 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2787 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2788 << castExpr->getSourceRange(); 2789 break; 2790 } 2791 } 2792 if (Field == FieldEnd) 2793 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2794 << castExpr->getType() << castExpr->getSourceRange(); 2795 } else { 2796 // Reject any other conversions to non-scalar types. 2797 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2798 << castType << castExpr->getSourceRange(); 2799 } 2800 } else if (!castExpr->getType()->isScalarType() && 2801 !castExpr->getType()->isVectorType()) { 2802 return Diag(castExpr->getLocStart(), 2803 diag::err_typecheck_expect_scalar_operand) 2804 << castExpr->getType() << castExpr->getSourceRange(); 2805 } else if (castExpr->getType()->isVectorType()) { 2806 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2807 return true; 2808 } else if (castType->isVectorType()) { 2809 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2810 return true; 2811 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2812 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2813 } else if (!castType->isArithmeticType()) { 2814 QualType castExprType = castExpr->getType(); 2815 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2816 return Diag(castExpr->getLocStart(), 2817 diag::err_cast_pointer_from_non_pointer_int) 2818 << castExprType << castExpr->getSourceRange(); 2819 } else if (!castExpr->getType()->isArithmeticType()) { 2820 if (!castType->isIntegralType() && castType->isArithmeticType()) 2821 return Diag(castExpr->getLocStart(), 2822 diag::err_cast_pointer_to_non_pointer_int) 2823 << castType << castExpr->getSourceRange(); 2824 } 2825 if (isa<ObjCSelectorExpr>(castExpr)) 2826 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2827 return false; 2828} 2829 2830bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2831 assert(VectorTy->isVectorType() && "Not a vector type!"); 2832 2833 if (Ty->isVectorType() || Ty->isIntegerType()) { 2834 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2835 return Diag(R.getBegin(), 2836 Ty->isVectorType() ? 2837 diag::err_invalid_conversion_between_vectors : 2838 diag::err_invalid_conversion_between_vector_and_integer) 2839 << VectorTy << Ty << R; 2840 } else 2841 return Diag(R.getBegin(), 2842 diag::err_invalid_conversion_between_vector_and_scalar) 2843 << VectorTy << Ty << R; 2844 2845 return false; 2846} 2847 2848Action::OwningExprResult 2849Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2850 SourceLocation RParenLoc, ExprArg Op) { 2851 assert((Ty != 0) && (Op.get() != 0) && 2852 "ActOnCastExpr(): missing type or expr"); 2853 2854 Expr *castExpr = Op.takeAs<Expr>(); 2855 QualType castType = QualType::getFromOpaquePtr(Ty); 2856 2857 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2858 return ExprError(); 2859 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2860 LParenLoc, RParenLoc)); 2861} 2862 2863/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2864/// In that case, lhs = cond. 2865/// C99 6.5.15 2866QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2867 SourceLocation QuestionLoc) { 2868 // C++ is sufficiently different to merit its own checker. 2869 if (getLangOptions().CPlusPlus) 2870 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2871 2872 UsualUnaryConversions(Cond); 2873 UsualUnaryConversions(LHS); 2874 UsualUnaryConversions(RHS); 2875 QualType CondTy = Cond->getType(); 2876 QualType LHSTy = LHS->getType(); 2877 QualType RHSTy = RHS->getType(); 2878 2879 // first, check the condition. 2880 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2881 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2882 << CondTy; 2883 return QualType(); 2884 } 2885 2886 // Now check the two expressions. 2887 2888 // If both operands have arithmetic type, do the usual arithmetic conversions 2889 // to find a common type: C99 6.5.15p3,5. 2890 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2891 UsualArithmeticConversions(LHS, RHS); 2892 return LHS->getType(); 2893 } 2894 2895 // If both operands are the same structure or union type, the result is that 2896 // type. 2897 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2898 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2899 if (LHSRT->getDecl() == RHSRT->getDecl()) 2900 // "If both the operands have structure or union type, the result has 2901 // that type." This implies that CV qualifiers are dropped. 2902 return LHSTy.getUnqualifiedType(); 2903 // FIXME: Type of conditional expression must be complete in C mode. 2904 } 2905 2906 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2907 // The following || allows only one side to be void (a GCC-ism). 2908 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2909 if (!LHSTy->isVoidType()) 2910 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2911 << RHS->getSourceRange(); 2912 if (!RHSTy->isVoidType()) 2913 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2914 << LHS->getSourceRange(); 2915 ImpCastExprToType(LHS, Context.VoidTy); 2916 ImpCastExprToType(RHS, Context.VoidTy); 2917 return Context.VoidTy; 2918 } 2919 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2920 // the type of the other operand." 2921 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2922 Context.isObjCObjectPointerType(LHSTy)) && 2923 RHS->isNullPointerConstant(Context)) { 2924 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2925 return LHSTy; 2926 } 2927 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2928 Context.isObjCObjectPointerType(RHSTy)) && 2929 LHS->isNullPointerConstant(Context)) { 2930 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2931 return RHSTy; 2932 } 2933 2934 const PointerType *LHSPT = LHSTy->getAsPointerType(); 2935 const PointerType *RHSPT = RHSTy->getAsPointerType(); 2936 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 2937 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); 2938 2939 // Handle the case where both operands are pointers before we handle null 2940 // pointer constants in case both operands are null pointer constants. 2941 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 2942 // get the "pointed to" types 2943 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 2944 : LHSBPT->getPointeeType()); 2945 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 2946 : RHSBPT->getPointeeType()); 2947 2948 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2949 if (lhptee->isVoidType() 2950 && (RHSBPT || rhptee->isIncompleteOrObjectType())) { 2951 // Figure out necessary qualifiers (C99 6.5.15p6) 2952 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2953 QualType destType = Context.getPointerType(destPointee); 2954 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2955 ImpCastExprToType(RHS, destType); // promote to void* 2956 return destType; 2957 } 2958 if (rhptee->isVoidType() 2959 && (LHSBPT || lhptee->isIncompleteOrObjectType())) { 2960 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2961 QualType destType = Context.getPointerType(destPointee); 2962 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2963 ImpCastExprToType(RHS, destType); // promote to void* 2964 return destType; 2965 } 2966 2967 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 2968 if (sameKind 2969 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2970 // Two identical pointer types are always compatible. 2971 return LHSTy; 2972 } 2973 2974 QualType compositeType = LHSTy; 2975 2976 // If either type is an Objective-C object type then check 2977 // compatibility according to Objective-C. 2978 if (Context.isObjCObjectPointerType(LHSTy) || 2979 Context.isObjCObjectPointerType(RHSTy)) { 2980 // If both operands are interfaces and either operand can be 2981 // assigned to the other, use that type as the composite 2982 // type. This allows 2983 // xxx ? (A*) a : (B*) b 2984 // where B is a subclass of A. 2985 // 2986 // Additionally, as for assignment, if either type is 'id' 2987 // allow silent coercion. Finally, if the types are 2988 // incompatible then make sure to use 'id' as the composite 2989 // type so the result is acceptable for sending messages to. 2990 2991 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2992 // It could return the composite type. 2993 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2994 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2995 if (LHSIface && RHSIface && 2996 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2997 compositeType = LHSTy; 2998 } else if (LHSIface && RHSIface && 2999 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3000 compositeType = RHSTy; 3001 } else if (Context.isObjCIdStructType(lhptee) || 3002 Context.isObjCIdStructType(rhptee)) { 3003 compositeType = Context.getObjCIdType(); 3004 } else if (LHSBPT || RHSBPT) { 3005 if (!sameKind 3006 || !Context.typesAreBlockCompatible(lhptee.getUnqualifiedType(), 3007 rhptee.getUnqualifiedType())) 3008 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3009 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3010 return QualType(); 3011 } else { 3012 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3013 << LHSTy << RHSTy 3014 << LHS->getSourceRange() << RHS->getSourceRange(); 3015 QualType incompatTy = Context.getObjCIdType(); 3016 ImpCastExprToType(LHS, incompatTy); 3017 ImpCastExprToType(RHS, incompatTy); 3018 return incompatTy; 3019 } 3020 } else if (!sameKind 3021 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3022 rhptee.getUnqualifiedType())) { 3023 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3024 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3025 // In this situation, we assume void* type. No especially good 3026 // reason, but this is what gcc does, and we do have to pick 3027 // to get a consistent AST. 3028 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3029 ImpCastExprToType(LHS, incompatTy); 3030 ImpCastExprToType(RHS, incompatTy); 3031 return incompatTy; 3032 } 3033 // The pointer types are compatible. 3034 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3035 // differently qualified versions of compatible types, the result type is 3036 // a pointer to an appropriately qualified version of the *composite* 3037 // type. 3038 // FIXME: Need to calculate the composite type. 3039 // FIXME: Need to add qualifiers 3040 ImpCastExprToType(LHS, compositeType); 3041 ImpCastExprToType(RHS, compositeType); 3042 return compositeType; 3043 } 3044 3045 // GCC compatibility: soften pointer/integer mismatch. 3046 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3047 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3048 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3049 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3050 return RHSTy; 3051 } 3052 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3053 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3054 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3055 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3056 return LHSTy; 3057 } 3058 3059 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3060 // evaluates to "struct objc_object *" (and is handled above when comparing 3061 // id with statically typed objects). 3062 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3063 // GCC allows qualified id and any Objective-C type to devolve to 3064 // id. Currently localizing to here until clear this should be 3065 // part of ObjCQualifiedIdTypesAreCompatible. 3066 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3067 (LHSTy->isObjCQualifiedIdType() && 3068 Context.isObjCObjectPointerType(RHSTy)) || 3069 (RHSTy->isObjCQualifiedIdType() && 3070 Context.isObjCObjectPointerType(LHSTy))) { 3071 // FIXME: This is not the correct composite type. This only happens to 3072 // work because id can more or less be used anywhere, however this may 3073 // change the type of method sends. 3074 3075 // FIXME: gcc adds some type-checking of the arguments and emits 3076 // (confusing) incompatible comparison warnings in some 3077 // cases. Investigate. 3078 QualType compositeType = Context.getObjCIdType(); 3079 ImpCastExprToType(LHS, compositeType); 3080 ImpCastExprToType(RHS, compositeType); 3081 return compositeType; 3082 } 3083 } 3084 3085 // Otherwise, the operands are not compatible. 3086 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3087 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3088 return QualType(); 3089} 3090 3091/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3092/// in the case of a the GNU conditional expr extension. 3093Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3094 SourceLocation ColonLoc, 3095 ExprArg Cond, ExprArg LHS, 3096 ExprArg RHS) { 3097 Expr *CondExpr = (Expr *) Cond.get(); 3098 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3099 3100 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3101 // was the condition. 3102 bool isLHSNull = LHSExpr == 0; 3103 if (isLHSNull) 3104 LHSExpr = CondExpr; 3105 3106 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3107 RHSExpr, QuestionLoc); 3108 if (result.isNull()) 3109 return ExprError(); 3110 3111 Cond.release(); 3112 LHS.release(); 3113 RHS.release(); 3114 return Owned(new (Context) ConditionalOperator(CondExpr, 3115 isLHSNull ? 0 : LHSExpr, 3116 RHSExpr, result)); 3117} 3118 3119 3120// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3121// being closely modeled after the C99 spec:-). The odd characteristic of this 3122// routine is it effectively iqnores the qualifiers on the top level pointee. 3123// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3124// FIXME: add a couple examples in this comment. 3125Sema::AssignConvertType 3126Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3127 QualType lhptee, rhptee; 3128 3129 // get the "pointed to" type (ignoring qualifiers at the top level) 3130 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3131 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3132 3133 // make sure we operate on the canonical type 3134 lhptee = Context.getCanonicalType(lhptee); 3135 rhptee = Context.getCanonicalType(rhptee); 3136 3137 AssignConvertType ConvTy = Compatible; 3138 3139 // C99 6.5.16.1p1: This following citation is common to constraints 3140 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3141 // qualifiers of the type *pointed to* by the right; 3142 // FIXME: Handle ExtQualType 3143 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3144 ConvTy = CompatiblePointerDiscardsQualifiers; 3145 3146 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3147 // incomplete type and the other is a pointer to a qualified or unqualified 3148 // version of void... 3149 if (lhptee->isVoidType()) { 3150 if (rhptee->isIncompleteOrObjectType()) 3151 return ConvTy; 3152 3153 // As an extension, we allow cast to/from void* to function pointer. 3154 assert(rhptee->isFunctionType()); 3155 return FunctionVoidPointer; 3156 } 3157 3158 if (rhptee->isVoidType()) { 3159 if (lhptee->isIncompleteOrObjectType()) 3160 return ConvTy; 3161 3162 // As an extension, we allow cast to/from void* to function pointer. 3163 assert(lhptee->isFunctionType()); 3164 return FunctionVoidPointer; 3165 } 3166 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3167 // unqualified versions of compatible types, ... 3168 lhptee = lhptee.getUnqualifiedType(); 3169 rhptee = rhptee.getUnqualifiedType(); 3170 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3171 // Check if the pointee types are compatible ignoring the sign. 3172 // We explicitly check for char so that we catch "char" vs 3173 // "unsigned char" on systems where "char" is unsigned. 3174 if (lhptee->isCharType()) { 3175 lhptee = Context.UnsignedCharTy; 3176 } else if (lhptee->isSignedIntegerType()) { 3177 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3178 } 3179 if (rhptee->isCharType()) { 3180 rhptee = Context.UnsignedCharTy; 3181 } else if (rhptee->isSignedIntegerType()) { 3182 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3183 } 3184 if (lhptee == rhptee) { 3185 // Types are compatible ignoring the sign. Qualifier incompatibility 3186 // takes priority over sign incompatibility because the sign 3187 // warning can be disabled. 3188 if (ConvTy != Compatible) 3189 return ConvTy; 3190 return IncompatiblePointerSign; 3191 } 3192 // General pointer incompatibility takes priority over qualifiers. 3193 return IncompatiblePointer; 3194 } 3195 return ConvTy; 3196} 3197 3198/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3199/// block pointer types are compatible or whether a block and normal pointer 3200/// are compatible. It is more restrict than comparing two function pointer 3201// types. 3202Sema::AssignConvertType 3203Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3204 QualType rhsType) { 3205 QualType lhptee, rhptee; 3206 3207 // get the "pointed to" type (ignoring qualifiers at the top level) 3208 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3209 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3210 3211 // make sure we operate on the canonical type 3212 lhptee = Context.getCanonicalType(lhptee); 3213 rhptee = Context.getCanonicalType(rhptee); 3214 3215 AssignConvertType ConvTy = Compatible; 3216 3217 // For blocks we enforce that qualifiers are identical. 3218 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3219 ConvTy = CompatiblePointerDiscardsQualifiers; 3220 3221 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 3222 return IncompatibleBlockPointer; 3223 return ConvTy; 3224} 3225 3226/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3227/// has code to accommodate several GCC extensions when type checking 3228/// pointers. Here are some objectionable examples that GCC considers warnings: 3229/// 3230/// int a, *pint; 3231/// short *pshort; 3232/// struct foo *pfoo; 3233/// 3234/// pint = pshort; // warning: assignment from incompatible pointer type 3235/// a = pint; // warning: assignment makes integer from pointer without a cast 3236/// pint = a; // warning: assignment makes pointer from integer without a cast 3237/// pint = pfoo; // warning: assignment from incompatible pointer type 3238/// 3239/// As a result, the code for dealing with pointers is more complex than the 3240/// C99 spec dictates. 3241/// 3242Sema::AssignConvertType 3243Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3244 // Get canonical types. We're not formatting these types, just comparing 3245 // them. 3246 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3247 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3248 3249 if (lhsType == rhsType) 3250 return Compatible; // Common case: fast path an exact match. 3251 3252 // If the left-hand side is a reference type, then we are in a 3253 // (rare!) case where we've allowed the use of references in C, 3254 // e.g., as a parameter type in a built-in function. In this case, 3255 // just make sure that the type referenced is compatible with the 3256 // right-hand side type. The caller is responsible for adjusting 3257 // lhsType so that the resulting expression does not have reference 3258 // type. 3259 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3260 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3261 return Compatible; 3262 return Incompatible; 3263 } 3264 3265 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3266 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3267 return Compatible; 3268 // Relax integer conversions like we do for pointers below. 3269 if (rhsType->isIntegerType()) 3270 return IntToPointer; 3271 if (lhsType->isIntegerType()) 3272 return PointerToInt; 3273 return IncompatibleObjCQualifiedId; 3274 } 3275 3276 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3277 // For ExtVector, allow vector splats; float -> <n x float> 3278 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3279 if (LV->getElementType() == rhsType) 3280 return Compatible; 3281 3282 // If we are allowing lax vector conversions, and LHS and RHS are both 3283 // vectors, the total size only needs to be the same. This is a bitcast; 3284 // no bits are changed but the result type is different. 3285 if (getLangOptions().LaxVectorConversions && 3286 lhsType->isVectorType() && rhsType->isVectorType()) { 3287 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3288 return IncompatibleVectors; 3289 } 3290 return Incompatible; 3291 } 3292 3293 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3294 return Compatible; 3295 3296 if (isa<PointerType>(lhsType)) { 3297 if (rhsType->isIntegerType()) 3298 return IntToPointer; 3299 3300 if (isa<PointerType>(rhsType)) 3301 return CheckPointerTypesForAssignment(lhsType, rhsType); 3302 3303 if (rhsType->getAsBlockPointerType()) { 3304 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3305 return Compatible; 3306 3307 // Treat block pointers as objects. 3308 if (getLangOptions().ObjC1 && 3309 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3310 return Compatible; 3311 } 3312 return Incompatible; 3313 } 3314 3315 if (isa<BlockPointerType>(lhsType)) { 3316 if (rhsType->isIntegerType()) 3317 return IntToBlockPointer; 3318 3319 // Treat block pointers as objects. 3320 if (getLangOptions().ObjC1 && 3321 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3322 return Compatible; 3323 3324 if (rhsType->isBlockPointerType()) 3325 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3326 3327 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3328 if (RHSPT->getPointeeType()->isVoidType()) 3329 return Compatible; 3330 } 3331 return Incompatible; 3332 } 3333 3334 if (isa<PointerType>(rhsType)) { 3335 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3336 if (lhsType == Context.BoolTy) 3337 return Compatible; 3338 3339 if (lhsType->isIntegerType()) 3340 return PointerToInt; 3341 3342 if (isa<PointerType>(lhsType)) 3343 return CheckPointerTypesForAssignment(lhsType, rhsType); 3344 3345 if (isa<BlockPointerType>(lhsType) && 3346 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3347 return Compatible; 3348 return Incompatible; 3349 } 3350 3351 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3352 if (Context.typesAreCompatible(lhsType, rhsType)) 3353 return Compatible; 3354 } 3355 return Incompatible; 3356} 3357 3358/// \brief Constructs a transparent union from an expression that is 3359/// used to initialize the transparent union. 3360static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3361 QualType UnionType, FieldDecl *Field) { 3362 // Build an initializer list that designates the appropriate member 3363 // of the transparent union. 3364 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3365 &E, 1, 3366 SourceLocation()); 3367 Initializer->setType(UnionType); 3368 Initializer->setInitializedFieldInUnion(Field); 3369 3370 // Build a compound literal constructing a value of the transparent 3371 // union type from this initializer list. 3372 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3373 false); 3374} 3375 3376Sema::AssignConvertType 3377Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3378 QualType FromType = rExpr->getType(); 3379 3380 // If the ArgType is a Union type, we want to handle a potential 3381 // transparent_union GCC extension. 3382 const RecordType *UT = ArgType->getAsUnionType(); 3383 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3384 return Incompatible; 3385 3386 // The field to initialize within the transparent union. 3387 RecordDecl *UD = UT->getDecl(); 3388 FieldDecl *InitField = 0; 3389 // It's compatible if the expression matches any of the fields. 3390 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3391 itend = UD->field_end(Context); 3392 it != itend; ++it) { 3393 if (it->getType()->isPointerType()) { 3394 // If the transparent union contains a pointer type, we allow: 3395 // 1) void pointer 3396 // 2) null pointer constant 3397 if (FromType->isPointerType()) 3398 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3399 ImpCastExprToType(rExpr, it->getType()); 3400 InitField = *it; 3401 break; 3402 } 3403 3404 if (rExpr->isNullPointerConstant(Context)) { 3405 ImpCastExprToType(rExpr, it->getType()); 3406 InitField = *it; 3407 break; 3408 } 3409 } 3410 3411 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3412 == Compatible) { 3413 InitField = *it; 3414 break; 3415 } 3416 } 3417 3418 if (!InitField) 3419 return Incompatible; 3420 3421 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3422 return Compatible; 3423} 3424 3425Sema::AssignConvertType 3426Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3427 if (getLangOptions().CPlusPlus) { 3428 if (!lhsType->isRecordType()) { 3429 // C++ 5.17p3: If the left operand is not of class type, the 3430 // expression is implicitly converted (C++ 4) to the 3431 // cv-unqualified type of the left operand. 3432 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3433 "assigning")) 3434 return Incompatible; 3435 return Compatible; 3436 } 3437 3438 // FIXME: Currently, we fall through and treat C++ classes like C 3439 // structures. 3440 } 3441 3442 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3443 // a null pointer constant. 3444 if ((lhsType->isPointerType() || 3445 lhsType->isObjCQualifiedIdType() || 3446 lhsType->isBlockPointerType()) 3447 && rExpr->isNullPointerConstant(Context)) { 3448 ImpCastExprToType(rExpr, lhsType); 3449 return Compatible; 3450 } 3451 3452 // This check seems unnatural, however it is necessary to ensure the proper 3453 // conversion of functions/arrays. If the conversion were done for all 3454 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3455 // expressions that surpress this implicit conversion (&, sizeof). 3456 // 3457 // Suppress this for references: C++ 8.5.3p5. 3458 if (!lhsType->isReferenceType()) 3459 DefaultFunctionArrayConversion(rExpr); 3460 3461 Sema::AssignConvertType result = 3462 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3463 3464 // C99 6.5.16.1p2: The value of the right operand is converted to the 3465 // type of the assignment expression. 3466 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3467 // so that we can use references in built-in functions even in C. 3468 // The getNonReferenceType() call makes sure that the resulting expression 3469 // does not have reference type. 3470 if (result != Incompatible && rExpr->getType() != lhsType) 3471 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3472 return result; 3473} 3474 3475QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3476 Diag(Loc, diag::err_typecheck_invalid_operands) 3477 << lex->getType() << rex->getType() 3478 << lex->getSourceRange() << rex->getSourceRange(); 3479 return QualType(); 3480} 3481 3482inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3483 Expr *&rex) { 3484 // For conversion purposes, we ignore any qualifiers. 3485 // For example, "const float" and "float" are equivalent. 3486 QualType lhsType = 3487 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3488 QualType rhsType = 3489 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3490 3491 // If the vector types are identical, return. 3492 if (lhsType == rhsType) 3493 return lhsType; 3494 3495 // Handle the case of a vector & extvector type of the same size and element 3496 // type. It would be nice if we only had one vector type someday. 3497 if (getLangOptions().LaxVectorConversions) { 3498 // FIXME: Should we warn here? 3499 if (const VectorType *LV = lhsType->getAsVectorType()) { 3500 if (const VectorType *RV = rhsType->getAsVectorType()) 3501 if (LV->getElementType() == RV->getElementType() && 3502 LV->getNumElements() == RV->getNumElements()) { 3503 return lhsType->isExtVectorType() ? lhsType : rhsType; 3504 } 3505 } 3506 } 3507 3508 // If the lhs is an extended vector and the rhs is a scalar of the same type 3509 // or a literal, promote the rhs to the vector type. 3510 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3511 QualType eltType = V->getElementType(); 3512 3513 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3514 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3515 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3516 ImpCastExprToType(rex, lhsType); 3517 return lhsType; 3518 } 3519 } 3520 3521 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3522 // promote the lhs to the vector type. 3523 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3524 QualType eltType = V->getElementType(); 3525 3526 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3527 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3528 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3529 ImpCastExprToType(lex, rhsType); 3530 return rhsType; 3531 } 3532 } 3533 3534 // You cannot convert between vector values of different size. 3535 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3536 << lex->getType() << rex->getType() 3537 << lex->getSourceRange() << rex->getSourceRange(); 3538 return QualType(); 3539} 3540 3541inline QualType Sema::CheckMultiplyDivideOperands( 3542 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3543{ 3544 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3545 return CheckVectorOperands(Loc, lex, rex); 3546 3547 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3548 3549 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3550 return compType; 3551 return InvalidOperands(Loc, lex, rex); 3552} 3553 3554inline QualType Sema::CheckRemainderOperands( 3555 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3556{ 3557 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3558 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3559 return CheckVectorOperands(Loc, lex, rex); 3560 return InvalidOperands(Loc, lex, rex); 3561 } 3562 3563 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3564 3565 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3566 return compType; 3567 return InvalidOperands(Loc, lex, rex); 3568} 3569 3570inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3571 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3572{ 3573 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3574 QualType compType = CheckVectorOperands(Loc, lex, rex); 3575 if (CompLHSTy) *CompLHSTy = compType; 3576 return compType; 3577 } 3578 3579 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3580 3581 // handle the common case first (both operands are arithmetic). 3582 if (lex->getType()->isArithmeticType() && 3583 rex->getType()->isArithmeticType()) { 3584 if (CompLHSTy) *CompLHSTy = compType; 3585 return compType; 3586 } 3587 3588 // Put any potential pointer into PExp 3589 Expr* PExp = lex, *IExp = rex; 3590 if (IExp->getType()->isPointerType()) 3591 std::swap(PExp, IExp); 3592 3593 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3594 if (IExp->getType()->isIntegerType()) { 3595 QualType PointeeTy = PTy->getPointeeType(); 3596 // Check for arithmetic on pointers to incomplete types. 3597 if (PointeeTy->isVoidType()) { 3598 if (getLangOptions().CPlusPlus) { 3599 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3600 << lex->getSourceRange() << rex->getSourceRange(); 3601 return QualType(); 3602 } 3603 3604 // GNU extension: arithmetic on pointer to void 3605 Diag(Loc, diag::ext_gnu_void_ptr) 3606 << lex->getSourceRange() << rex->getSourceRange(); 3607 } else if (PointeeTy->isFunctionType()) { 3608 if (getLangOptions().CPlusPlus) { 3609 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3610 << lex->getType() << lex->getSourceRange(); 3611 return QualType(); 3612 } 3613 3614 // GNU extension: arithmetic on pointer to function 3615 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3616 << lex->getType() << lex->getSourceRange(); 3617 } else if (!PTy->isDependentType() && 3618 RequireCompleteType(Loc, PointeeTy, 3619 diag::err_typecheck_arithmetic_incomplete_type, 3620 PExp->getSourceRange(), SourceRange(), 3621 PExp->getType())) 3622 return QualType(); 3623 3624 // Diagnose bad cases where we step over interface counts. 3625 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3626 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3627 << PointeeTy << PExp->getSourceRange(); 3628 return QualType(); 3629 } 3630 3631 if (CompLHSTy) { 3632 QualType LHSTy = lex->getType(); 3633 if (LHSTy->isPromotableIntegerType()) 3634 LHSTy = Context.IntTy; 3635 else { 3636 QualType T = isPromotableBitField(lex, Context); 3637 if (!T.isNull()) 3638 LHSTy = T; 3639 } 3640 3641 *CompLHSTy = LHSTy; 3642 } 3643 return PExp->getType(); 3644 } 3645 } 3646 3647 return InvalidOperands(Loc, lex, rex); 3648} 3649 3650// C99 6.5.6 3651QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3652 SourceLocation Loc, QualType* CompLHSTy) { 3653 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3654 QualType compType = CheckVectorOperands(Loc, lex, rex); 3655 if (CompLHSTy) *CompLHSTy = compType; 3656 return compType; 3657 } 3658 3659 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3660 3661 // Enforce type constraints: C99 6.5.6p3. 3662 3663 // Handle the common case first (both operands are arithmetic). 3664 if (lex->getType()->isArithmeticType() 3665 && rex->getType()->isArithmeticType()) { 3666 if (CompLHSTy) *CompLHSTy = compType; 3667 return compType; 3668 } 3669 3670 // Either ptr - int or ptr - ptr. 3671 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3672 QualType lpointee = LHSPTy->getPointeeType(); 3673 3674 // The LHS must be an completely-defined object type. 3675 3676 bool ComplainAboutVoid = false; 3677 Expr *ComplainAboutFunc = 0; 3678 if (lpointee->isVoidType()) { 3679 if (getLangOptions().CPlusPlus) { 3680 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3681 << lex->getSourceRange() << rex->getSourceRange(); 3682 return QualType(); 3683 } 3684 3685 // GNU C extension: arithmetic on pointer to void 3686 ComplainAboutVoid = true; 3687 } else if (lpointee->isFunctionType()) { 3688 if (getLangOptions().CPlusPlus) { 3689 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3690 << lex->getType() << lex->getSourceRange(); 3691 return QualType(); 3692 } 3693 3694 // GNU C extension: arithmetic on pointer to function 3695 ComplainAboutFunc = lex; 3696 } else if (!lpointee->isDependentType() && 3697 RequireCompleteType(Loc, lpointee, 3698 diag::err_typecheck_sub_ptr_object, 3699 lex->getSourceRange(), 3700 SourceRange(), 3701 lex->getType())) 3702 return QualType(); 3703 3704 // Diagnose bad cases where we step over interface counts. 3705 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3706 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3707 << lpointee << lex->getSourceRange(); 3708 return QualType(); 3709 } 3710 3711 // The result type of a pointer-int computation is the pointer type. 3712 if (rex->getType()->isIntegerType()) { 3713 if (ComplainAboutVoid) 3714 Diag(Loc, diag::ext_gnu_void_ptr) 3715 << lex->getSourceRange() << rex->getSourceRange(); 3716 if (ComplainAboutFunc) 3717 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3718 << ComplainAboutFunc->getType() 3719 << ComplainAboutFunc->getSourceRange(); 3720 3721 if (CompLHSTy) *CompLHSTy = lex->getType(); 3722 return lex->getType(); 3723 } 3724 3725 // Handle pointer-pointer subtractions. 3726 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3727 QualType rpointee = RHSPTy->getPointeeType(); 3728 3729 // RHS must be a completely-type object type. 3730 // Handle the GNU void* extension. 3731 if (rpointee->isVoidType()) { 3732 if (getLangOptions().CPlusPlus) { 3733 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3734 << lex->getSourceRange() << rex->getSourceRange(); 3735 return QualType(); 3736 } 3737 3738 ComplainAboutVoid = true; 3739 } else if (rpointee->isFunctionType()) { 3740 if (getLangOptions().CPlusPlus) { 3741 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3742 << rex->getType() << rex->getSourceRange(); 3743 return QualType(); 3744 } 3745 3746 // GNU extension: arithmetic on pointer to function 3747 if (!ComplainAboutFunc) 3748 ComplainAboutFunc = rex; 3749 } else if (!rpointee->isDependentType() && 3750 RequireCompleteType(Loc, rpointee, 3751 diag::err_typecheck_sub_ptr_object, 3752 rex->getSourceRange(), 3753 SourceRange(), 3754 rex->getType())) 3755 return QualType(); 3756 3757 if (getLangOptions().CPlusPlus) { 3758 // Pointee types must be the same: C++ [expr.add] 3759 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3760 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3761 << lex->getType() << rex->getType() 3762 << lex->getSourceRange() << rex->getSourceRange(); 3763 return QualType(); 3764 } 3765 } else { 3766 // Pointee types must be compatible C99 6.5.6p3 3767 if (!Context.typesAreCompatible( 3768 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3769 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3770 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3771 << lex->getType() << rex->getType() 3772 << lex->getSourceRange() << rex->getSourceRange(); 3773 return QualType(); 3774 } 3775 } 3776 3777 if (ComplainAboutVoid) 3778 Diag(Loc, diag::ext_gnu_void_ptr) 3779 << lex->getSourceRange() << rex->getSourceRange(); 3780 if (ComplainAboutFunc) 3781 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3782 << ComplainAboutFunc->getType() 3783 << ComplainAboutFunc->getSourceRange(); 3784 3785 if (CompLHSTy) *CompLHSTy = lex->getType(); 3786 return Context.getPointerDiffType(); 3787 } 3788 } 3789 3790 return InvalidOperands(Loc, lex, rex); 3791} 3792 3793// C99 6.5.7 3794QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3795 bool isCompAssign) { 3796 // C99 6.5.7p2: Each of the operands shall have integer type. 3797 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3798 return InvalidOperands(Loc, lex, rex); 3799 3800 // Shifts don't perform usual arithmetic conversions, they just do integer 3801 // promotions on each operand. C99 6.5.7p3 3802 QualType LHSTy; 3803 if (lex->getType()->isPromotableIntegerType()) 3804 LHSTy = Context.IntTy; 3805 else { 3806 LHSTy = isPromotableBitField(lex, Context); 3807 if (LHSTy.isNull()) 3808 LHSTy = lex->getType(); 3809 } 3810 if (!isCompAssign) 3811 ImpCastExprToType(lex, LHSTy); 3812 3813 UsualUnaryConversions(rex); 3814 3815 // "The type of the result is that of the promoted left operand." 3816 return LHSTy; 3817} 3818 3819// C99 6.5.8, C++ [expr.rel] 3820QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3821 unsigned OpaqueOpc, bool isRelational) { 3822 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3823 3824 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3825 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3826 3827 // C99 6.5.8p3 / C99 6.5.9p4 3828 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3829 UsualArithmeticConversions(lex, rex); 3830 else { 3831 UsualUnaryConversions(lex); 3832 UsualUnaryConversions(rex); 3833 } 3834 QualType lType = lex->getType(); 3835 QualType rType = rex->getType(); 3836 3837 if (!lType->isFloatingType() 3838 && !(lType->isBlockPointerType() && isRelational)) { 3839 // For non-floating point types, check for self-comparisons of the form 3840 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3841 // often indicate logic errors in the program. 3842 // NOTE: Don't warn about comparisons of enum constants. These can arise 3843 // from macro expansions, and are usually quite deliberate. 3844 Expr *LHSStripped = lex->IgnoreParens(); 3845 Expr *RHSStripped = rex->IgnoreParens(); 3846 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3847 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3848 if (DRL->getDecl() == DRR->getDecl() && 3849 !isa<EnumConstantDecl>(DRL->getDecl())) 3850 Diag(Loc, diag::warn_selfcomparison); 3851 3852 if (isa<CastExpr>(LHSStripped)) 3853 LHSStripped = LHSStripped->IgnoreParenCasts(); 3854 if (isa<CastExpr>(RHSStripped)) 3855 RHSStripped = RHSStripped->IgnoreParenCasts(); 3856 3857 // Warn about comparisons against a string constant (unless the other 3858 // operand is null), the user probably wants strcmp. 3859 Expr *literalString = 0; 3860 Expr *literalStringStripped = 0; 3861 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3862 !RHSStripped->isNullPointerConstant(Context)) { 3863 literalString = lex; 3864 literalStringStripped = LHSStripped; 3865 } 3866 else if ((isa<StringLiteral>(RHSStripped) || 3867 isa<ObjCEncodeExpr>(RHSStripped)) && 3868 !LHSStripped->isNullPointerConstant(Context)) { 3869 literalString = rex; 3870 literalStringStripped = RHSStripped; 3871 } 3872 3873 if (literalString) { 3874 std::string resultComparison; 3875 switch (Opc) { 3876 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3877 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3878 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3879 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3880 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3881 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3882 default: assert(false && "Invalid comparison operator"); 3883 } 3884 Diag(Loc, diag::warn_stringcompare) 3885 << isa<ObjCEncodeExpr>(literalStringStripped) 3886 << literalString->getSourceRange() 3887 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3888 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3889 "strcmp(") 3890 << CodeModificationHint::CreateInsertion( 3891 PP.getLocForEndOfToken(rex->getLocEnd()), 3892 resultComparison); 3893 } 3894 } 3895 3896 // The result of comparisons is 'bool' in C++, 'int' in C. 3897 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3898 3899 if (isRelational) { 3900 if (lType->isRealType() && rType->isRealType()) 3901 return ResultTy; 3902 } else { 3903 // Check for comparisons of floating point operands using != and ==. 3904 if (lType->isFloatingType()) { 3905 assert(rType->isFloatingType()); 3906 CheckFloatComparison(Loc,lex,rex); 3907 } 3908 3909 if (lType->isArithmeticType() && rType->isArithmeticType()) 3910 return ResultTy; 3911 } 3912 3913 bool LHSIsNull = lex->isNullPointerConstant(Context); 3914 bool RHSIsNull = rex->isNullPointerConstant(Context); 3915 3916 // All of the following pointer related warnings are GCC extensions, except 3917 // when handling null pointer constants. One day, we can consider making them 3918 // errors (when -pedantic-errors is enabled). 3919 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3920 QualType LCanPointeeTy = 3921 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3922 QualType RCanPointeeTy = 3923 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3924 3925 // Simple check: if the pointee types are identical, we're done. 3926 if (LCanPointeeTy == RCanPointeeTy) 3927 return ResultTy; 3928 3929 if (getLangOptions().CPlusPlus) { 3930 // C++ [expr.rel]p2: 3931 // [...] Pointer conversions (4.10) and qualification 3932 // conversions (4.4) are performed on pointer operands (or on 3933 // a pointer operand and a null pointer constant) to bring 3934 // them to their composite pointer type. [...] 3935 // 3936 // C++ [expr.eq]p2 uses the same notion for (in)equality 3937 // comparisons of pointers. 3938 QualType T = FindCompositePointerType(lex, rex); 3939 if (T.isNull()) { 3940 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 3941 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3942 return QualType(); 3943 } 3944 3945 ImpCastExprToType(lex, T); 3946 ImpCastExprToType(rex, T); 3947 return ResultTy; 3948 } 3949 3950 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3951 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3952 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3953 RCanPointeeTy.getUnqualifiedType()) && 3954 !Context.areComparableObjCPointerTypes(lType, rType)) { 3955 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3956 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3957 } 3958 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3959 return ResultTy; 3960 } 3961 // C++ allows comparison of pointers with null pointer constants. 3962 if (getLangOptions().CPlusPlus) { 3963 if (lType->isPointerType() && RHSIsNull) { 3964 ImpCastExprToType(rex, lType); 3965 return ResultTy; 3966 } 3967 if (rType->isPointerType() && LHSIsNull) { 3968 ImpCastExprToType(lex, rType); 3969 return ResultTy; 3970 } 3971 // And comparison of nullptr_t with itself. 3972 if (lType->isNullPtrType() && rType->isNullPtrType()) 3973 return ResultTy; 3974 } 3975 // Handle block pointer types. 3976 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 3977 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3978 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3979 3980 if (!LHSIsNull && !RHSIsNull && 3981 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3982 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3983 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3984 } 3985 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3986 return ResultTy; 3987 } 3988 // Allow block pointers to be compared with null pointer constants. 3989 if (!isRelational 3990 && ((lType->isBlockPointerType() && rType->isPointerType()) 3991 || (lType->isPointerType() && rType->isBlockPointerType()))) { 3992 if (!LHSIsNull && !RHSIsNull) { 3993 if (!((rType->isPointerType() && rType->getAsPointerType() 3994 ->getPointeeType()->isVoidType()) 3995 || (lType->isPointerType() && lType->getAsPointerType() 3996 ->getPointeeType()->isVoidType()))) 3997 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3998 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3999 } 4000 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4001 return ResultTy; 4002 } 4003 4004 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4005 if (lType->isPointerType() || rType->isPointerType()) { 4006 const PointerType *LPT = lType->getAsPointerType(); 4007 const PointerType *RPT = rType->getAsPointerType(); 4008 bool LPtrToVoid = LPT ? 4009 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4010 bool RPtrToVoid = RPT ? 4011 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4012 4013 if (!LPtrToVoid && !RPtrToVoid && 4014 !Context.typesAreCompatible(lType, rType)) { 4015 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4016 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4017 ImpCastExprToType(rex, lType); 4018 return ResultTy; 4019 } 4020 ImpCastExprToType(rex, lType); 4021 return ResultTy; 4022 } 4023 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4024 ImpCastExprToType(rex, lType); 4025 return ResultTy; 4026 } else { 4027 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4028 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4029 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4030 ImpCastExprToType(rex, lType); 4031 return ResultTy; 4032 } 4033 } 4034 } 4035 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4036 rType->isIntegerType()) { 4037 if (!RHSIsNull) 4038 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4039 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4040 ImpCastExprToType(rex, lType); // promote the integer to pointer 4041 return ResultTy; 4042 } 4043 if (lType->isIntegerType() && 4044 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 4045 if (!LHSIsNull) 4046 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4047 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4048 ImpCastExprToType(lex, rType); // promote the integer to pointer 4049 return ResultTy; 4050 } 4051 // Handle block pointers. 4052 if (!isRelational && RHSIsNull 4053 && lType->isBlockPointerType() && rType->isIntegerType()) { 4054 ImpCastExprToType(rex, lType); // promote the integer to pointer 4055 return ResultTy; 4056 } 4057 if (!isRelational && LHSIsNull 4058 && lType->isIntegerType() && rType->isBlockPointerType()) { 4059 ImpCastExprToType(lex, rType); // promote the integer to pointer 4060 return ResultTy; 4061 } 4062 return InvalidOperands(Loc, lex, rex); 4063} 4064 4065/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4066/// operates on extended vector types. Instead of producing an IntTy result, 4067/// like a scalar comparison, a vector comparison produces a vector of integer 4068/// types. 4069QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4070 SourceLocation Loc, 4071 bool isRelational) { 4072 // Check to make sure we're operating on vectors of the same type and width, 4073 // Allowing one side to be a scalar of element type. 4074 QualType vType = CheckVectorOperands(Loc, lex, rex); 4075 if (vType.isNull()) 4076 return vType; 4077 4078 QualType lType = lex->getType(); 4079 QualType rType = rex->getType(); 4080 4081 // For non-floating point types, check for self-comparisons of the form 4082 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4083 // often indicate logic errors in the program. 4084 if (!lType->isFloatingType()) { 4085 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4086 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4087 if (DRL->getDecl() == DRR->getDecl()) 4088 Diag(Loc, diag::warn_selfcomparison); 4089 } 4090 4091 // Check for comparisons of floating point operands using != and ==. 4092 if (!isRelational && lType->isFloatingType()) { 4093 assert (rType->isFloatingType()); 4094 CheckFloatComparison(Loc,lex,rex); 4095 } 4096 4097 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4098 // just reject all vector comparisons for now. 4099 if (1) { 4100 Diag(Loc, diag::err_typecheck_vector_comparison) 4101 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4102 return QualType(); 4103 } 4104 4105 // Return the type for the comparison, which is the same as vector type for 4106 // integer vectors, or an integer type of identical size and number of 4107 // elements for floating point vectors. 4108 if (lType->isIntegerType()) 4109 return lType; 4110 4111 const VectorType *VTy = lType->getAsVectorType(); 4112 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4113 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4114 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4115 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4116 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4117 4118 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4119 "Unhandled vector element size in vector compare"); 4120 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4121} 4122 4123inline QualType Sema::CheckBitwiseOperands( 4124 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4125{ 4126 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4127 return CheckVectorOperands(Loc, lex, rex); 4128 4129 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4130 4131 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4132 return compType; 4133 return InvalidOperands(Loc, lex, rex); 4134} 4135 4136inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4137 Expr *&lex, Expr *&rex, SourceLocation Loc) 4138{ 4139 UsualUnaryConversions(lex); 4140 UsualUnaryConversions(rex); 4141 4142 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4143 return Context.IntTy; 4144 return InvalidOperands(Loc, lex, rex); 4145} 4146 4147/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4148/// is a read-only property; return true if so. A readonly property expression 4149/// depends on various declarations and thus must be treated specially. 4150/// 4151static bool IsReadonlyProperty(Expr *E, Sema &S) 4152{ 4153 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4154 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4155 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4156 QualType BaseType = PropExpr->getBase()->getType(); 4157 if (const PointerType *PTy = BaseType->getAsPointerType()) 4158 if (const ObjCInterfaceType *IFTy = 4159 PTy->getPointeeType()->getAsObjCInterfaceType()) 4160 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4161 if (S.isPropertyReadonly(PDecl, IFace)) 4162 return true; 4163 } 4164 } 4165 return false; 4166} 4167 4168/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4169/// emit an error and return true. If so, return false. 4170static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4171 SourceLocation OrigLoc = Loc; 4172 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4173 &Loc); 4174 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4175 IsLV = Expr::MLV_ReadonlyProperty; 4176 if (IsLV == Expr::MLV_Valid) 4177 return false; 4178 4179 unsigned Diag = 0; 4180 bool NeedType = false; 4181 switch (IsLV) { // C99 6.5.16p2 4182 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4183 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4184 case Expr::MLV_ArrayType: 4185 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4186 NeedType = true; 4187 break; 4188 case Expr::MLV_NotObjectType: 4189 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4190 NeedType = true; 4191 break; 4192 case Expr::MLV_LValueCast: 4193 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4194 break; 4195 case Expr::MLV_InvalidExpression: 4196 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4197 break; 4198 case Expr::MLV_IncompleteType: 4199 case Expr::MLV_IncompleteVoidType: 4200 return S.RequireCompleteType(Loc, E->getType(), 4201 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4202 E->getSourceRange()); 4203 case Expr::MLV_DuplicateVectorComponents: 4204 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4205 break; 4206 case Expr::MLV_NotBlockQualified: 4207 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4208 break; 4209 case Expr::MLV_ReadonlyProperty: 4210 Diag = diag::error_readonly_property_assignment; 4211 break; 4212 case Expr::MLV_NoSetterProperty: 4213 Diag = diag::error_nosetter_property_assignment; 4214 break; 4215 } 4216 4217 SourceRange Assign; 4218 if (Loc != OrigLoc) 4219 Assign = SourceRange(OrigLoc, OrigLoc); 4220 if (NeedType) 4221 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4222 else 4223 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4224 return true; 4225} 4226 4227 4228 4229// C99 6.5.16.1 4230QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4231 SourceLocation Loc, 4232 QualType CompoundType) { 4233 // Verify that LHS is a modifiable lvalue, and emit error if not. 4234 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4235 return QualType(); 4236 4237 QualType LHSType = LHS->getType(); 4238 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4239 4240 AssignConvertType ConvTy; 4241 if (CompoundType.isNull()) { 4242 // Simple assignment "x = y". 4243 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4244 // Special case of NSObject attributes on c-style pointer types. 4245 if (ConvTy == IncompatiblePointer && 4246 ((Context.isObjCNSObjectType(LHSType) && 4247 Context.isObjCObjectPointerType(RHSType)) || 4248 (Context.isObjCNSObjectType(RHSType) && 4249 Context.isObjCObjectPointerType(LHSType)))) 4250 ConvTy = Compatible; 4251 4252 // If the RHS is a unary plus or minus, check to see if they = and + are 4253 // right next to each other. If so, the user may have typo'd "x =+ 4" 4254 // instead of "x += 4". 4255 Expr *RHSCheck = RHS; 4256 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4257 RHSCheck = ICE->getSubExpr(); 4258 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4259 if ((UO->getOpcode() == UnaryOperator::Plus || 4260 UO->getOpcode() == UnaryOperator::Minus) && 4261 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4262 // Only if the two operators are exactly adjacent. 4263 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4264 // And there is a space or other character before the subexpr of the 4265 // unary +/-. We don't want to warn on "x=-1". 4266 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4267 UO->getSubExpr()->getLocStart().isFileID()) { 4268 Diag(Loc, diag::warn_not_compound_assign) 4269 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4270 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4271 } 4272 } 4273 } else { 4274 // Compound assignment "x += y" 4275 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4276 } 4277 4278 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4279 RHS, "assigning")) 4280 return QualType(); 4281 4282 // C99 6.5.16p3: The type of an assignment expression is the type of the 4283 // left operand unless the left operand has qualified type, in which case 4284 // it is the unqualified version of the type of the left operand. 4285 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4286 // is converted to the type of the assignment expression (above). 4287 // C++ 5.17p1: the type of the assignment expression is that of its left 4288 // operand. 4289 return LHSType.getUnqualifiedType(); 4290} 4291 4292// C99 6.5.17 4293QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4294 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4295 DefaultFunctionArrayConversion(RHS); 4296 4297 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4298 // incomplete in C++). 4299 4300 return RHS->getType(); 4301} 4302 4303/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4304/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4305QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4306 bool isInc) { 4307 if (Op->isTypeDependent()) 4308 return Context.DependentTy; 4309 4310 QualType ResType = Op->getType(); 4311 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4312 4313 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4314 // Decrement of bool is not allowed. 4315 if (!isInc) { 4316 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4317 return QualType(); 4318 } 4319 // Increment of bool sets it to true, but is deprecated. 4320 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4321 } else if (ResType->isRealType()) { 4322 // OK! 4323 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4324 // C99 6.5.2.4p2, 6.5.6p2 4325 if (PT->getPointeeType()->isVoidType()) { 4326 if (getLangOptions().CPlusPlus) { 4327 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4328 << Op->getSourceRange(); 4329 return QualType(); 4330 } 4331 4332 // Pointer to void is a GNU extension in C. 4333 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4334 } else if (PT->getPointeeType()->isFunctionType()) { 4335 if (getLangOptions().CPlusPlus) { 4336 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4337 << Op->getType() << Op->getSourceRange(); 4338 return QualType(); 4339 } 4340 4341 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4342 << ResType << Op->getSourceRange(); 4343 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4344 diag::err_typecheck_arithmetic_incomplete_type, 4345 Op->getSourceRange(), SourceRange(), 4346 ResType)) 4347 return QualType(); 4348 } else if (ResType->isComplexType()) { 4349 // C99 does not support ++/-- on complex types, we allow as an extension. 4350 Diag(OpLoc, diag::ext_integer_increment_complex) 4351 << ResType << Op->getSourceRange(); 4352 } else { 4353 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4354 << ResType << Op->getSourceRange(); 4355 return QualType(); 4356 } 4357 // At this point, we know we have a real, complex or pointer type. 4358 // Now make sure the operand is a modifiable lvalue. 4359 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4360 return QualType(); 4361 return ResType; 4362} 4363 4364/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4365/// This routine allows us to typecheck complex/recursive expressions 4366/// where the declaration is needed for type checking. We only need to 4367/// handle cases when the expression references a function designator 4368/// or is an lvalue. Here are some examples: 4369/// - &(x) => x 4370/// - &*****f => f for f a function designator. 4371/// - &s.xx => s 4372/// - &s.zz[1].yy -> s, if zz is an array 4373/// - *(x + 1) -> x, if x is an array 4374/// - &"123"[2] -> 0 4375/// - & __real__ x -> x 4376static NamedDecl *getPrimaryDecl(Expr *E) { 4377 switch (E->getStmtClass()) { 4378 case Stmt::DeclRefExprClass: 4379 case Stmt::QualifiedDeclRefExprClass: 4380 return cast<DeclRefExpr>(E)->getDecl(); 4381 case Stmt::MemberExprClass: 4382 // If this is an arrow operator, the address is an offset from 4383 // the base's value, so the object the base refers to is 4384 // irrelevant. 4385 if (cast<MemberExpr>(E)->isArrow()) 4386 return 0; 4387 // Otherwise, the expression refers to a part of the base 4388 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4389 case Stmt::ArraySubscriptExprClass: { 4390 // FIXME: This code shouldn't be necessary! We should catch the implicit 4391 // promotion of register arrays earlier. 4392 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4393 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4394 if (ICE->getSubExpr()->getType()->isArrayType()) 4395 return getPrimaryDecl(ICE->getSubExpr()); 4396 } 4397 return 0; 4398 } 4399 case Stmt::UnaryOperatorClass: { 4400 UnaryOperator *UO = cast<UnaryOperator>(E); 4401 4402 switch(UO->getOpcode()) { 4403 case UnaryOperator::Real: 4404 case UnaryOperator::Imag: 4405 case UnaryOperator::Extension: 4406 return getPrimaryDecl(UO->getSubExpr()); 4407 default: 4408 return 0; 4409 } 4410 } 4411 case Stmt::ParenExprClass: 4412 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4413 case Stmt::ImplicitCastExprClass: 4414 // If the result of an implicit cast is an l-value, we care about 4415 // the sub-expression; otherwise, the result here doesn't matter. 4416 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4417 default: 4418 return 0; 4419 } 4420} 4421 4422/// CheckAddressOfOperand - The operand of & must be either a function 4423/// designator or an lvalue designating an object. If it is an lvalue, the 4424/// object cannot be declared with storage class register or be a bit field. 4425/// Note: The usual conversions are *not* applied to the operand of the & 4426/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4427/// In C++, the operand might be an overloaded function name, in which case 4428/// we allow the '&' but retain the overloaded-function type. 4429QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4430 // Make sure to ignore parentheses in subsequent checks 4431 op = op->IgnoreParens(); 4432 4433 if (op->isTypeDependent()) 4434 return Context.DependentTy; 4435 4436 if (getLangOptions().C99) { 4437 // Implement C99-only parts of addressof rules. 4438 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4439 if (uOp->getOpcode() == UnaryOperator::Deref) 4440 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4441 // (assuming the deref expression is valid). 4442 return uOp->getSubExpr()->getType(); 4443 } 4444 // Technically, there should be a check for array subscript 4445 // expressions here, but the result of one is always an lvalue anyway. 4446 } 4447 NamedDecl *dcl = getPrimaryDecl(op); 4448 Expr::isLvalueResult lval = op->isLvalue(Context); 4449 4450 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4451 // C99 6.5.3.2p1 4452 // The operand must be either an l-value or a function designator 4453 if (!op->getType()->isFunctionType()) { 4454 // FIXME: emit more specific diag... 4455 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4456 << op->getSourceRange(); 4457 return QualType(); 4458 } 4459 } else if (op->getBitField()) { // C99 6.5.3.2p1 4460 // The operand cannot be a bit-field 4461 Diag(OpLoc, diag::err_typecheck_address_of) 4462 << "bit-field" << op->getSourceRange(); 4463 return QualType(); 4464 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4465 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4466 // The operand cannot be an element of a vector 4467 Diag(OpLoc, diag::err_typecheck_address_of) 4468 << "vector element" << op->getSourceRange(); 4469 return QualType(); 4470 } else if (dcl) { // C99 6.5.3.2p1 4471 // We have an lvalue with a decl. Make sure the decl is not declared 4472 // with the register storage-class specifier. 4473 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4474 if (vd->getStorageClass() == VarDecl::Register) { 4475 Diag(OpLoc, diag::err_typecheck_address_of) 4476 << "register variable" << op->getSourceRange(); 4477 return QualType(); 4478 } 4479 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4480 return Context.OverloadTy; 4481 } else if (isa<FieldDecl>(dcl)) { 4482 // Okay: we can take the address of a field. 4483 // Could be a pointer to member, though, if there is an explicit 4484 // scope qualifier for the class. 4485 if (isa<QualifiedDeclRefExpr>(op)) { 4486 DeclContext *Ctx = dcl->getDeclContext(); 4487 if (Ctx && Ctx->isRecord()) 4488 return Context.getMemberPointerType(op->getType(), 4489 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4490 } 4491 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4492 // Okay: we can take the address of a function. 4493 // As above. 4494 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4495 return Context.getMemberPointerType(op->getType(), 4496 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4497 } else if (!isa<FunctionDecl>(dcl)) 4498 assert(0 && "Unknown/unexpected decl type"); 4499 } 4500 4501 if (lval == Expr::LV_IncompleteVoidType) { 4502 // Taking the address of a void variable is technically illegal, but we 4503 // allow it in cases which are otherwise valid. 4504 // Example: "extern void x; void* y = &x;". 4505 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4506 } 4507 4508 // If the operand has type "type", the result has type "pointer to type". 4509 return Context.getPointerType(op->getType()); 4510} 4511 4512QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4513 if (Op->isTypeDependent()) 4514 return Context.DependentTy; 4515 4516 UsualUnaryConversions(Op); 4517 QualType Ty = Op->getType(); 4518 4519 // Note that per both C89 and C99, this is always legal, even if ptype is an 4520 // incomplete type or void. It would be possible to warn about dereferencing 4521 // a void pointer, but it's completely well-defined, and such a warning is 4522 // unlikely to catch any mistakes. 4523 if (const PointerType *PT = Ty->getAsPointerType()) 4524 return PT->getPointeeType(); 4525 4526 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4527 << Ty << Op->getSourceRange(); 4528 return QualType(); 4529} 4530 4531static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4532 tok::TokenKind Kind) { 4533 BinaryOperator::Opcode Opc; 4534 switch (Kind) { 4535 default: assert(0 && "Unknown binop!"); 4536 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4537 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4538 case tok::star: Opc = BinaryOperator::Mul; break; 4539 case tok::slash: Opc = BinaryOperator::Div; break; 4540 case tok::percent: Opc = BinaryOperator::Rem; break; 4541 case tok::plus: Opc = BinaryOperator::Add; break; 4542 case tok::minus: Opc = BinaryOperator::Sub; break; 4543 case tok::lessless: Opc = BinaryOperator::Shl; break; 4544 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4545 case tok::lessequal: Opc = BinaryOperator::LE; break; 4546 case tok::less: Opc = BinaryOperator::LT; break; 4547 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4548 case tok::greater: Opc = BinaryOperator::GT; break; 4549 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4550 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4551 case tok::amp: Opc = BinaryOperator::And; break; 4552 case tok::caret: Opc = BinaryOperator::Xor; break; 4553 case tok::pipe: Opc = BinaryOperator::Or; break; 4554 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4555 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4556 case tok::equal: Opc = BinaryOperator::Assign; break; 4557 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4558 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4559 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4560 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4561 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4562 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4563 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4564 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4565 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4566 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4567 case tok::comma: Opc = BinaryOperator::Comma; break; 4568 } 4569 return Opc; 4570} 4571 4572static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4573 tok::TokenKind Kind) { 4574 UnaryOperator::Opcode Opc; 4575 switch (Kind) { 4576 default: assert(0 && "Unknown unary op!"); 4577 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4578 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4579 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4580 case tok::star: Opc = UnaryOperator::Deref; break; 4581 case tok::plus: Opc = UnaryOperator::Plus; break; 4582 case tok::minus: Opc = UnaryOperator::Minus; break; 4583 case tok::tilde: Opc = UnaryOperator::Not; break; 4584 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4585 case tok::kw___real: Opc = UnaryOperator::Real; break; 4586 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4587 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4588 } 4589 return Opc; 4590} 4591 4592/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4593/// operator @p Opc at location @c TokLoc. This routine only supports 4594/// built-in operations; ActOnBinOp handles overloaded operators. 4595Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4596 unsigned Op, 4597 Expr *lhs, Expr *rhs) { 4598 QualType ResultTy; // Result type of the binary operator. 4599 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4600 // The following two variables are used for compound assignment operators 4601 QualType CompLHSTy; // Type of LHS after promotions for computation 4602 QualType CompResultTy; // Type of computation result 4603 4604 switch (Opc) { 4605 case BinaryOperator::Assign: 4606 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4607 break; 4608 case BinaryOperator::PtrMemD: 4609 case BinaryOperator::PtrMemI: 4610 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4611 Opc == BinaryOperator::PtrMemI); 4612 break; 4613 case BinaryOperator::Mul: 4614 case BinaryOperator::Div: 4615 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4616 break; 4617 case BinaryOperator::Rem: 4618 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4619 break; 4620 case BinaryOperator::Add: 4621 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4622 break; 4623 case BinaryOperator::Sub: 4624 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4625 break; 4626 case BinaryOperator::Shl: 4627 case BinaryOperator::Shr: 4628 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4629 break; 4630 case BinaryOperator::LE: 4631 case BinaryOperator::LT: 4632 case BinaryOperator::GE: 4633 case BinaryOperator::GT: 4634 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4635 break; 4636 case BinaryOperator::EQ: 4637 case BinaryOperator::NE: 4638 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4639 break; 4640 case BinaryOperator::And: 4641 case BinaryOperator::Xor: 4642 case BinaryOperator::Or: 4643 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4644 break; 4645 case BinaryOperator::LAnd: 4646 case BinaryOperator::LOr: 4647 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4648 break; 4649 case BinaryOperator::MulAssign: 4650 case BinaryOperator::DivAssign: 4651 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4652 CompLHSTy = CompResultTy; 4653 if (!CompResultTy.isNull()) 4654 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4655 break; 4656 case BinaryOperator::RemAssign: 4657 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4658 CompLHSTy = CompResultTy; 4659 if (!CompResultTy.isNull()) 4660 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4661 break; 4662 case BinaryOperator::AddAssign: 4663 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4664 if (!CompResultTy.isNull()) 4665 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4666 break; 4667 case BinaryOperator::SubAssign: 4668 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4669 if (!CompResultTy.isNull()) 4670 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4671 break; 4672 case BinaryOperator::ShlAssign: 4673 case BinaryOperator::ShrAssign: 4674 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4675 CompLHSTy = CompResultTy; 4676 if (!CompResultTy.isNull()) 4677 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4678 break; 4679 case BinaryOperator::AndAssign: 4680 case BinaryOperator::XorAssign: 4681 case BinaryOperator::OrAssign: 4682 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4683 CompLHSTy = CompResultTy; 4684 if (!CompResultTy.isNull()) 4685 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4686 break; 4687 case BinaryOperator::Comma: 4688 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4689 break; 4690 } 4691 if (ResultTy.isNull()) 4692 return ExprError(); 4693 if (CompResultTy.isNull()) 4694 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4695 else 4696 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4697 CompLHSTy, CompResultTy, 4698 OpLoc)); 4699} 4700 4701// Binary Operators. 'Tok' is the token for the operator. 4702Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4703 tok::TokenKind Kind, 4704 ExprArg LHS, ExprArg RHS) { 4705 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4706 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4707 4708 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4709 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4710 4711 if (getLangOptions().CPlusPlus && 4712 (lhs->getType()->isOverloadableType() || 4713 rhs->getType()->isOverloadableType())) { 4714 // Find all of the overloaded operators visible from this 4715 // point. We perform both an operator-name lookup from the local 4716 // scope and an argument-dependent lookup based on the types of 4717 // the arguments. 4718 FunctionSet Functions; 4719 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4720 if (OverOp != OO_None) { 4721 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4722 Functions); 4723 Expr *Args[2] = { lhs, rhs }; 4724 DeclarationName OpName 4725 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4726 ArgumentDependentLookup(OpName, Args, 2, Functions); 4727 } 4728 4729 // Build the (potentially-overloaded, potentially-dependent) 4730 // binary operation. 4731 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4732 } 4733 4734 // Build a built-in binary operation. 4735 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4736} 4737 4738Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4739 unsigned OpcIn, 4740 ExprArg InputArg) { 4741 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4742 4743 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4744 Expr *Input = (Expr *)InputArg.get(); 4745 QualType resultType; 4746 switch (Opc) { 4747 case UnaryOperator::PostInc: 4748 case UnaryOperator::PostDec: 4749 case UnaryOperator::OffsetOf: 4750 assert(false && "Invalid unary operator"); 4751 break; 4752 4753 case UnaryOperator::PreInc: 4754 case UnaryOperator::PreDec: 4755 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4756 Opc == UnaryOperator::PreInc); 4757 break; 4758 case UnaryOperator::AddrOf: 4759 resultType = CheckAddressOfOperand(Input, OpLoc); 4760 break; 4761 case UnaryOperator::Deref: 4762 DefaultFunctionArrayConversion(Input); 4763 resultType = CheckIndirectionOperand(Input, OpLoc); 4764 break; 4765 case UnaryOperator::Plus: 4766 case UnaryOperator::Minus: 4767 UsualUnaryConversions(Input); 4768 resultType = Input->getType(); 4769 if (resultType->isDependentType()) 4770 break; 4771 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4772 break; 4773 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4774 resultType->isEnumeralType()) 4775 break; 4776 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4777 Opc == UnaryOperator::Plus && 4778 resultType->isPointerType()) 4779 break; 4780 4781 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4782 << resultType << Input->getSourceRange()); 4783 case UnaryOperator::Not: // bitwise complement 4784 UsualUnaryConversions(Input); 4785 resultType = Input->getType(); 4786 if (resultType->isDependentType()) 4787 break; 4788 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4789 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4790 // C99 does not support '~' for complex conjugation. 4791 Diag(OpLoc, diag::ext_integer_complement_complex) 4792 << resultType << Input->getSourceRange(); 4793 else if (!resultType->isIntegerType()) 4794 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4795 << resultType << Input->getSourceRange()); 4796 break; 4797 case UnaryOperator::LNot: // logical negation 4798 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4799 DefaultFunctionArrayConversion(Input); 4800 resultType = Input->getType(); 4801 if (resultType->isDependentType()) 4802 break; 4803 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4804 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4805 << resultType << Input->getSourceRange()); 4806 // LNot always has type int. C99 6.5.3.3p5. 4807 // In C++, it's bool. C++ 5.3.1p8 4808 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4809 break; 4810 case UnaryOperator::Real: 4811 case UnaryOperator::Imag: 4812 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4813 break; 4814 case UnaryOperator::Extension: 4815 resultType = Input->getType(); 4816 break; 4817 } 4818 if (resultType.isNull()) 4819 return ExprError(); 4820 4821 InputArg.release(); 4822 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4823} 4824 4825// Unary Operators. 'Tok' is the token for the operator. 4826Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4827 tok::TokenKind Op, ExprArg input) { 4828 Expr *Input = (Expr*)input.get(); 4829 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4830 4831 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4832 // Find all of the overloaded operators visible from this 4833 // point. We perform both an operator-name lookup from the local 4834 // scope and an argument-dependent lookup based on the types of 4835 // the arguments. 4836 FunctionSet Functions; 4837 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4838 if (OverOp != OO_None) { 4839 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4840 Functions); 4841 DeclarationName OpName 4842 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4843 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4844 } 4845 4846 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4847 } 4848 4849 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4850} 4851 4852/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4853Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4854 SourceLocation LabLoc, 4855 IdentifierInfo *LabelII) { 4856 // Look up the record for this label identifier. 4857 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4858 4859 // If we haven't seen this label yet, create a forward reference. It 4860 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4861 if (LabelDecl == 0) 4862 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4863 4864 // Create the AST node. The address of a label always has type 'void*'. 4865 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4866 Context.getPointerType(Context.VoidTy))); 4867} 4868 4869Sema::OwningExprResult 4870Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4871 SourceLocation RPLoc) { // "({..})" 4872 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4873 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4874 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4875 4876 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4877 if (isFileScope) 4878 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4879 4880 // FIXME: there are a variety of strange constraints to enforce here, for 4881 // example, it is not possible to goto into a stmt expression apparently. 4882 // More semantic analysis is needed. 4883 4884 // If there are sub stmts in the compound stmt, take the type of the last one 4885 // as the type of the stmtexpr. 4886 QualType Ty = Context.VoidTy; 4887 4888 if (!Compound->body_empty()) { 4889 Stmt *LastStmt = Compound->body_back(); 4890 // If LastStmt is a label, skip down through into the body. 4891 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4892 LastStmt = Label->getSubStmt(); 4893 4894 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4895 Ty = LastExpr->getType(); 4896 } 4897 4898 // FIXME: Check that expression type is complete/non-abstract; statement 4899 // expressions are not lvalues. 4900 4901 substmt.release(); 4902 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4903} 4904 4905Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4906 SourceLocation BuiltinLoc, 4907 SourceLocation TypeLoc, 4908 TypeTy *argty, 4909 OffsetOfComponent *CompPtr, 4910 unsigned NumComponents, 4911 SourceLocation RPLoc) { 4912 // FIXME: This function leaks all expressions in the offset components on 4913 // error. 4914 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4915 assert(!ArgTy.isNull() && "Missing type argument!"); 4916 4917 bool Dependent = ArgTy->isDependentType(); 4918 4919 // We must have at least one component that refers to the type, and the first 4920 // one is known to be a field designator. Verify that the ArgTy represents 4921 // a struct/union/class. 4922 if (!Dependent && !ArgTy->isRecordType()) 4923 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4924 4925 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4926 // with an incomplete type would be illegal. 4927 4928 // Otherwise, create a null pointer as the base, and iteratively process 4929 // the offsetof designators. 4930 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4931 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4932 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4933 ArgTy, SourceLocation()); 4934 4935 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4936 // GCC extension, diagnose them. 4937 // FIXME: This diagnostic isn't actually visible because the location is in 4938 // a system header! 4939 if (NumComponents != 1) 4940 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4941 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4942 4943 if (!Dependent) { 4944 bool DidWarnAboutNonPOD = false; 4945 4946 // FIXME: Dependent case loses a lot of information here. And probably 4947 // leaks like a sieve. 4948 for (unsigned i = 0; i != NumComponents; ++i) { 4949 const OffsetOfComponent &OC = CompPtr[i]; 4950 if (OC.isBrackets) { 4951 // Offset of an array sub-field. TODO: Should we allow vector elements? 4952 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4953 if (!AT) { 4954 Res->Destroy(Context); 4955 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4956 << Res->getType()); 4957 } 4958 4959 // FIXME: C++: Verify that operator[] isn't overloaded. 4960 4961 // Promote the array so it looks more like a normal array subscript 4962 // expression. 4963 DefaultFunctionArrayConversion(Res); 4964 4965 // C99 6.5.2.1p1 4966 Expr *Idx = static_cast<Expr*>(OC.U.E); 4967 // FIXME: Leaks Res 4968 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4969 return ExprError(Diag(Idx->getLocStart(), 4970 diag::err_typecheck_subscript_not_integer) 4971 << Idx->getSourceRange()); 4972 4973 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4974 OC.LocEnd); 4975 continue; 4976 } 4977 4978 const RecordType *RC = Res->getType()->getAsRecordType(); 4979 if (!RC) { 4980 Res->Destroy(Context); 4981 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4982 << Res->getType()); 4983 } 4984 4985 // Get the decl corresponding to this. 4986 RecordDecl *RD = RC->getDecl(); 4987 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 4988 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 4989 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 4990 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 4991 << Res->getType()); 4992 DidWarnAboutNonPOD = true; 4993 } 4994 } 4995 4996 FieldDecl *MemberDecl 4997 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4998 LookupMemberName) 4999 .getAsDecl()); 5000 // FIXME: Leaks Res 5001 if (!MemberDecl) 5002 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5003 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5004 5005 // FIXME: C++: Verify that MemberDecl isn't a static field. 5006 // FIXME: Verify that MemberDecl isn't a bitfield. 5007 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5008 Res = BuildAnonymousStructUnionMemberReference( 5009 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5010 } else { 5011 // MemberDecl->getType() doesn't get the right qualifiers, but it 5012 // doesn't matter here. 5013 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5014 MemberDecl->getType().getNonReferenceType()); 5015 } 5016 } 5017 } 5018 5019 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5020 Context.getSizeType(), BuiltinLoc)); 5021} 5022 5023 5024Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5025 TypeTy *arg1,TypeTy *arg2, 5026 SourceLocation RPLoc) { 5027 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5028 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5029 5030 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5031 5032 if (getLangOptions().CPlusPlus) { 5033 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5034 << SourceRange(BuiltinLoc, RPLoc); 5035 return ExprError(); 5036 } 5037 5038 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5039 argT1, argT2, RPLoc)); 5040} 5041 5042Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5043 ExprArg cond, 5044 ExprArg expr1, ExprArg expr2, 5045 SourceLocation RPLoc) { 5046 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5047 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5048 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5049 5050 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5051 5052 QualType resType; 5053 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5054 resType = Context.DependentTy; 5055 } else { 5056 // The conditional expression is required to be a constant expression. 5057 llvm::APSInt condEval(32); 5058 SourceLocation ExpLoc; 5059 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5060 return ExprError(Diag(ExpLoc, 5061 diag::err_typecheck_choose_expr_requires_constant) 5062 << CondExpr->getSourceRange()); 5063 5064 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5065 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5066 } 5067 5068 cond.release(); expr1.release(); expr2.release(); 5069 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5070 resType, RPLoc)); 5071} 5072 5073//===----------------------------------------------------------------------===// 5074// Clang Extensions. 5075//===----------------------------------------------------------------------===// 5076 5077/// ActOnBlockStart - This callback is invoked when a block literal is started. 5078void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5079 // Analyze block parameters. 5080 BlockSemaInfo *BSI = new BlockSemaInfo(); 5081 5082 // Add BSI to CurBlock. 5083 BSI->PrevBlockInfo = CurBlock; 5084 CurBlock = BSI; 5085 5086 BSI->ReturnType = 0; 5087 BSI->TheScope = BlockScope; 5088 BSI->hasBlockDeclRefExprs = false; 5089 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5090 CurFunctionNeedsScopeChecking = false; 5091 5092 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5093 PushDeclContext(BlockScope, BSI->TheDecl); 5094} 5095 5096void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5097 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5098 5099 if (ParamInfo.getNumTypeObjects() == 0 5100 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5101 ProcessDeclAttributes(CurBlock->TheDecl, ParamInfo); 5102 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5103 5104 if (T->isArrayType()) { 5105 Diag(ParamInfo.getSourceRange().getBegin(), 5106 diag::err_block_returns_array); 5107 return; 5108 } 5109 5110 // The parameter list is optional, if there was none, assume (). 5111 if (!T->isFunctionType()) 5112 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5113 5114 CurBlock->hasPrototype = true; 5115 CurBlock->isVariadic = false; 5116 // Check for a valid sentinel attribute on this block. 5117 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5118 Diag(ParamInfo.getAttributes()->getLoc(), 5119 diag::warn_attribute_sentinel_not_variadic) << 1; 5120 // FIXME: remove the attribute. 5121 } 5122 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5123 5124 // Do not allow returning a objc interface by-value. 5125 if (RetTy->isObjCInterfaceType()) { 5126 Diag(ParamInfo.getSourceRange().getBegin(), 5127 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5128 return; 5129 } 5130 return; 5131 } 5132 5133 // Analyze arguments to block. 5134 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5135 "Not a function declarator!"); 5136 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5137 5138 CurBlock->hasPrototype = FTI.hasPrototype; 5139 CurBlock->isVariadic = true; 5140 5141 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5142 // no arguments, not a function that takes a single void argument. 5143 if (FTI.hasPrototype && 5144 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5145 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5146 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5147 // empty arg list, don't push any params. 5148 CurBlock->isVariadic = false; 5149 } else if (FTI.hasPrototype) { 5150 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5151 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5152 CurBlock->isVariadic = FTI.isVariadic; 5153 } 5154 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5155 CurBlock->Params.size()); 5156 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5157 ProcessDeclAttributes(CurBlock->TheDecl, ParamInfo); 5158 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5159 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5160 // If this has an identifier, add it to the scope stack. 5161 if ((*AI)->getIdentifier()) 5162 PushOnScopeChains(*AI, CurBlock->TheScope); 5163 5164 // Check for a valid sentinel attribute on this block. 5165 if (!CurBlock->isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5166 Diag(ParamInfo.getAttributes()->getLoc(), 5167 diag::warn_attribute_sentinel_not_variadic) << 1; 5168 // FIXME: remove the attribute. 5169 } 5170 5171 // Analyze the return type. 5172 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5173 QualType RetTy = T->getAsFunctionType()->getResultType(); 5174 5175 // Do not allow returning a objc interface by-value. 5176 if (RetTy->isObjCInterfaceType()) { 5177 Diag(ParamInfo.getSourceRange().getBegin(), 5178 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5179 } else if (!RetTy->isDependentType()) 5180 CurBlock->ReturnType = RetTy.getTypePtr(); 5181} 5182 5183/// ActOnBlockError - If there is an error parsing a block, this callback 5184/// is invoked to pop the information about the block from the action impl. 5185void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5186 // Ensure that CurBlock is deleted. 5187 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5188 5189 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5190 5191 // Pop off CurBlock, handle nested blocks. 5192 PopDeclContext(); 5193 CurBlock = CurBlock->PrevBlockInfo; 5194 // FIXME: Delete the ParmVarDecl objects as well??? 5195} 5196 5197/// ActOnBlockStmtExpr - This is called when the body of a block statement 5198/// literal was successfully completed. ^(int x){...} 5199Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5200 StmtArg body, Scope *CurScope) { 5201 // If blocks are disabled, emit an error. 5202 if (!LangOpts.Blocks) 5203 Diag(CaretLoc, diag::err_blocks_disable); 5204 5205 // Ensure that CurBlock is deleted. 5206 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5207 5208 PopDeclContext(); 5209 5210 // Pop off CurBlock, handle nested blocks. 5211 CurBlock = CurBlock->PrevBlockInfo; 5212 5213 QualType RetTy = Context.VoidTy; 5214 if (BSI->ReturnType) 5215 RetTy = QualType(BSI->ReturnType, 0); 5216 5217 llvm::SmallVector<QualType, 8> ArgTypes; 5218 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5219 ArgTypes.push_back(BSI->Params[i]->getType()); 5220 5221 QualType BlockTy; 5222 if (!BSI->hasPrototype) 5223 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5224 else 5225 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5226 BSI->isVariadic, 0); 5227 5228 // FIXME: Check that return/parameter types are complete/non-abstract 5229 5230 BlockTy = Context.getBlockPointerType(BlockTy); 5231 5232 // If needed, diagnose invalid gotos and switches in the block. 5233 if (CurFunctionNeedsScopeChecking) 5234 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5235 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5236 5237 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5238 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5239 BSI->hasBlockDeclRefExprs)); 5240} 5241 5242Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5243 ExprArg expr, TypeTy *type, 5244 SourceLocation RPLoc) { 5245 QualType T = QualType::getFromOpaquePtr(type); 5246 Expr *E = static_cast<Expr*>(expr.get()); 5247 Expr *OrigExpr = E; 5248 5249 InitBuiltinVaListType(); 5250 5251 // Get the va_list type 5252 QualType VaListType = Context.getBuiltinVaListType(); 5253 if (VaListType->isArrayType()) { 5254 // Deal with implicit array decay; for example, on x86-64, 5255 // va_list is an array, but it's supposed to decay to 5256 // a pointer for va_arg. 5257 VaListType = Context.getArrayDecayedType(VaListType); 5258 // Make sure the input expression also decays appropriately. 5259 UsualUnaryConversions(E); 5260 } else { 5261 // Otherwise, the va_list argument must be an l-value because 5262 // it is modified by va_arg. 5263 if (!E->isTypeDependent() && 5264 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5265 return ExprError(); 5266 } 5267 5268 if (!E->isTypeDependent() && 5269 !Context.hasSameType(VaListType, E->getType())) { 5270 return ExprError(Diag(E->getLocStart(), 5271 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5272 << OrigExpr->getType() << E->getSourceRange()); 5273 } 5274 5275 // FIXME: Check that type is complete/non-abstract 5276 // FIXME: Warn if a non-POD type is passed in. 5277 5278 expr.release(); 5279 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5280 RPLoc)); 5281} 5282 5283Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5284 // The type of __null will be int or long, depending on the size of 5285 // pointers on the target. 5286 QualType Ty; 5287 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5288 Ty = Context.IntTy; 5289 else 5290 Ty = Context.LongTy; 5291 5292 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5293} 5294 5295bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5296 SourceLocation Loc, 5297 QualType DstType, QualType SrcType, 5298 Expr *SrcExpr, const char *Flavor) { 5299 // Decode the result (notice that AST's are still created for extensions). 5300 bool isInvalid = false; 5301 unsigned DiagKind; 5302 switch (ConvTy) { 5303 default: assert(0 && "Unknown conversion type"); 5304 case Compatible: return false; 5305 case PointerToInt: 5306 DiagKind = diag::ext_typecheck_convert_pointer_int; 5307 break; 5308 case IntToPointer: 5309 DiagKind = diag::ext_typecheck_convert_int_pointer; 5310 break; 5311 case IncompatiblePointer: 5312 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5313 break; 5314 case IncompatiblePointerSign: 5315 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5316 break; 5317 case FunctionVoidPointer: 5318 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5319 break; 5320 case CompatiblePointerDiscardsQualifiers: 5321 // If the qualifiers lost were because we were applying the 5322 // (deprecated) C++ conversion from a string literal to a char* 5323 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5324 // Ideally, this check would be performed in 5325 // CheckPointerTypesForAssignment. However, that would require a 5326 // bit of refactoring (so that the second argument is an 5327 // expression, rather than a type), which should be done as part 5328 // of a larger effort to fix CheckPointerTypesForAssignment for 5329 // C++ semantics. 5330 if (getLangOptions().CPlusPlus && 5331 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5332 return false; 5333 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5334 break; 5335 case IntToBlockPointer: 5336 DiagKind = diag::err_int_to_block_pointer; 5337 break; 5338 case IncompatibleBlockPointer: 5339 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5340 break; 5341 case IncompatibleObjCQualifiedId: 5342 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5343 // it can give a more specific diagnostic. 5344 DiagKind = diag::warn_incompatible_qualified_id; 5345 break; 5346 case IncompatibleVectors: 5347 DiagKind = diag::warn_incompatible_vectors; 5348 break; 5349 case Incompatible: 5350 DiagKind = diag::err_typecheck_convert_incompatible; 5351 isInvalid = true; 5352 break; 5353 } 5354 5355 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5356 << SrcExpr->getSourceRange(); 5357 return isInvalid; 5358} 5359 5360bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5361 llvm::APSInt ICEResult; 5362 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5363 if (Result) 5364 *Result = ICEResult; 5365 return false; 5366 } 5367 5368 Expr::EvalResult EvalResult; 5369 5370 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5371 EvalResult.HasSideEffects) { 5372 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5373 5374 if (EvalResult.Diag) { 5375 // We only show the note if it's not the usual "invalid subexpression" 5376 // or if it's actually in a subexpression. 5377 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5378 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5379 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5380 } 5381 5382 return true; 5383 } 5384 5385 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5386 E->getSourceRange(); 5387 5388 if (EvalResult.Diag && 5389 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5390 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5391 5392 if (Result) 5393 *Result = EvalResult.Val.getInt(); 5394 return false; 5395} 5396