SemaExpr.cpp revision 194711
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>(Context)) { 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>(Context); 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>(Context); 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>(Context)) { 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>(Context); 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 MarkDeclarationReferenced(Loc, D); 631 if (SS && !SS->isEmpty()) { 632 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 633 ValueDependent, SS->getRange(), 634 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 635 } else 636 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 637} 638 639/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 640/// variable corresponding to the anonymous union or struct whose type 641/// is Record. 642static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 643 RecordDecl *Record) { 644 assert(Record->isAnonymousStructOrUnion() && 645 "Record must be an anonymous struct or union!"); 646 647 // FIXME: Once Decls are directly linked together, this will be an O(1) 648 // operation rather than a slow walk through DeclContext's vector (which 649 // itself will be eliminated). DeclGroups might make this even better. 650 DeclContext *Ctx = Record->getDeclContext(); 651 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 652 DEnd = Ctx->decls_end(Context); 653 D != DEnd; ++D) { 654 if (*D == Record) { 655 // The object for the anonymous struct/union directly 656 // follows its type in the list of declarations. 657 ++D; 658 assert(D != DEnd && "Missing object for anonymous record"); 659 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 660 return *D; 661 } 662 } 663 664 assert(false && "Missing object for anonymous record"); 665 return 0; 666} 667 668/// \brief Given a field that represents a member of an anonymous 669/// struct/union, build the path from that field's context to the 670/// actual member. 671/// 672/// Construct the sequence of field member references we'll have to 673/// perform to get to the field in the anonymous union/struct. The 674/// list of members is built from the field outward, so traverse it 675/// backwards to go from an object in the current context to the field 676/// we found. 677/// 678/// \returns The variable from which the field access should begin, 679/// for an anonymous struct/union that is not a member of another 680/// class. Otherwise, returns NULL. 681VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 682 llvm::SmallVectorImpl<FieldDecl *> &Path) { 683 assert(Field->getDeclContext()->isRecord() && 684 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 685 && "Field must be stored inside an anonymous struct or union"); 686 687 Path.push_back(Field); 688 VarDecl *BaseObject = 0; 689 DeclContext *Ctx = Field->getDeclContext(); 690 do { 691 RecordDecl *Record = cast<RecordDecl>(Ctx); 692 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 693 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 694 Path.push_back(AnonField); 695 else { 696 BaseObject = cast<VarDecl>(AnonObject); 697 break; 698 } 699 Ctx = Ctx->getParent(); 700 } while (Ctx->isRecord() && 701 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 702 703 return BaseObject; 704} 705 706Sema::OwningExprResult 707Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 708 FieldDecl *Field, 709 Expr *BaseObjectExpr, 710 SourceLocation OpLoc) { 711 llvm::SmallVector<FieldDecl *, 4> AnonFields; 712 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 713 AnonFields); 714 715 // Build the expression that refers to the base object, from 716 // which we will build a sequence of member references to each 717 // of the anonymous union objects and, eventually, the field we 718 // found via name lookup. 719 bool BaseObjectIsPointer = false; 720 unsigned ExtraQuals = 0; 721 if (BaseObject) { 722 // BaseObject is an anonymous struct/union variable (and is, 723 // therefore, not part of another non-anonymous record). 724 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 725 MarkDeclarationReferenced(Loc, BaseObject); 726 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 727 SourceLocation()); 728 ExtraQuals 729 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 730 } else if (BaseObjectExpr) { 731 // The caller provided the base object expression. Determine 732 // whether its a pointer and whether it adds any qualifiers to the 733 // anonymous struct/union fields we're looking into. 734 QualType ObjectType = BaseObjectExpr->getType(); 735 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 736 BaseObjectIsPointer = true; 737 ObjectType = ObjectPtr->getPointeeType(); 738 } 739 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 740 } else { 741 // We've found a member of an anonymous struct/union that is 742 // inside a non-anonymous struct/union, so in a well-formed 743 // program our base object expression is "this". 744 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 745 if (!MD->isStatic()) { 746 QualType AnonFieldType 747 = Context.getTagDeclType( 748 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 749 QualType ThisType = Context.getTagDeclType(MD->getParent()); 750 if ((Context.getCanonicalType(AnonFieldType) 751 == Context.getCanonicalType(ThisType)) || 752 IsDerivedFrom(ThisType, AnonFieldType)) { 753 // Our base object expression is "this". 754 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 755 MD->getThisType(Context)); 756 BaseObjectIsPointer = true; 757 } 758 } else { 759 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 760 << Field->getDeclName()); 761 } 762 ExtraQuals = MD->getTypeQualifiers(); 763 } 764 765 if (!BaseObjectExpr) 766 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 767 << Field->getDeclName()); 768 } 769 770 // Build the implicit member references to the field of the 771 // anonymous struct/union. 772 Expr *Result = BaseObjectExpr; 773 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 774 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 775 FI != FIEnd; ++FI) { 776 QualType MemberType = (*FI)->getType(); 777 if (!(*FI)->isMutable()) { 778 unsigned combinedQualifiers 779 = MemberType.getCVRQualifiers() | ExtraQuals; 780 MemberType = MemberType.getQualifiedType(combinedQualifiers); 781 } 782 MarkDeclarationReferenced(Loc, *FI); 783 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 784 OpLoc, MemberType); 785 BaseObjectIsPointer = false; 786 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 787 } 788 789 return Owned(Result); 790} 791 792/// ActOnDeclarationNameExpr - The parser has read some kind of name 793/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 794/// performs lookup on that name and returns an expression that refers 795/// to that name. This routine isn't directly called from the parser, 796/// because the parser doesn't know about DeclarationName. Rather, 797/// this routine is called by ActOnIdentifierExpr, 798/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 799/// which form the DeclarationName from the corresponding syntactic 800/// forms. 801/// 802/// HasTrailingLParen indicates whether this identifier is used in a 803/// function call context. LookupCtx is only used for a C++ 804/// qualified-id (foo::bar) to indicate the class or namespace that 805/// the identifier must be a member of. 806/// 807/// isAddressOfOperand means that this expression is the direct operand 808/// of an address-of operator. This matters because this is the only 809/// situation where a qualified name referencing a non-static member may 810/// appear outside a member function of this class. 811Sema::OwningExprResult 812Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 813 DeclarationName Name, bool HasTrailingLParen, 814 const CXXScopeSpec *SS, 815 bool isAddressOfOperand) { 816 // Could be enum-constant, value decl, instance variable, etc. 817 if (SS && SS->isInvalid()) 818 return ExprError(); 819 820 // C++ [temp.dep.expr]p3: 821 // An id-expression is type-dependent if it contains: 822 // -- a nested-name-specifier that contains a class-name that 823 // names a dependent type. 824 // FIXME: Member of the current instantiation. 825 if (SS && isDependentScopeSpecifier(*SS)) { 826 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 827 Loc, SS->getRange(), 828 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 829 } 830 831 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 832 false, true, Loc); 833 834 if (Lookup.isAmbiguous()) { 835 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 836 SS && SS->isSet() ? SS->getRange() 837 : SourceRange()); 838 return ExprError(); 839 } 840 841 NamedDecl *D = Lookup.getAsDecl(); 842 843 // If this reference is in an Objective-C method, then ivar lookup happens as 844 // well. 845 IdentifierInfo *II = Name.getAsIdentifierInfo(); 846 if (II && getCurMethodDecl()) { 847 // There are two cases to handle here. 1) scoped lookup could have failed, 848 // in which case we should look for an ivar. 2) scoped lookup could have 849 // found a decl, but that decl is outside the current instance method (i.e. 850 // a global variable). In these two cases, we do a lookup for an ivar with 851 // this name, if the lookup sucedes, we replace it our current decl. 852 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 853 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 854 ObjCInterfaceDecl *ClassDeclared; 855 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 856 ClassDeclared)) { 857 // Check if referencing a field with __attribute__((deprecated)). 858 if (DiagnoseUseOfDecl(IV, Loc)) 859 return ExprError(); 860 861 // If we're referencing an invalid decl, just return this as a silent 862 // error node. The error diagnostic was already emitted on the decl. 863 if (IV->isInvalidDecl()) 864 return ExprError(); 865 866 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 867 // If a class method attemps to use a free standing ivar, this is 868 // an error. 869 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 870 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 871 << IV->getDeclName()); 872 // If a class method uses a global variable, even if an ivar with 873 // same name exists, use the global. 874 if (!IsClsMethod) { 875 if (IV->getAccessControl() == ObjCIvarDecl::Private && 876 ClassDeclared != IFace) 877 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 878 // FIXME: This should use a new expr for a direct reference, don't 879 // turn this into Self->ivar, just return a BareIVarExpr or something. 880 IdentifierInfo &II = Context.Idents.get("self"); 881 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 882 MarkDeclarationReferenced(Loc, IV); 883 return Owned(new (Context) 884 ObjCIvarRefExpr(IV, IV->getType(), Loc, 885 SelfExpr.takeAs<Expr>(), true, true)); 886 } 887 } 888 } 889 else if (getCurMethodDecl()->isInstanceMethod()) { 890 // We should warn if a local variable hides an ivar. 891 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 892 ObjCInterfaceDecl *ClassDeclared; 893 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 894 ClassDeclared)) { 895 if (IV->getAccessControl() != ObjCIvarDecl::Private || 896 IFace == ClassDeclared) 897 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 898 } 899 } 900 // Needed to implement property "super.method" notation. 901 if (D == 0 && II->isStr("super")) { 902 QualType T; 903 904 if (getCurMethodDecl()->isInstanceMethod()) 905 T = Context.getPointerType(Context.getObjCInterfaceType( 906 getCurMethodDecl()->getClassInterface())); 907 else 908 T = Context.getObjCClassType(); 909 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 910 } 911 } 912 913 // Determine whether this name might be a candidate for 914 // argument-dependent lookup. 915 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 916 HasTrailingLParen; 917 918 if (ADL && D == 0) { 919 // We've seen something of the form 920 // 921 // identifier( 922 // 923 // and we did not find any entity by the name 924 // "identifier". However, this identifier is still subject to 925 // argument-dependent lookup, so keep track of the name. 926 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 927 Context.OverloadTy, 928 Loc)); 929 } 930 931 if (D == 0) { 932 // Otherwise, this could be an implicitly declared function reference (legal 933 // in C90, extension in C99). 934 if (HasTrailingLParen && II && 935 !getLangOptions().CPlusPlus) // Not in C++. 936 D = ImplicitlyDefineFunction(Loc, *II, S); 937 else { 938 // If this name wasn't predeclared and if this is not a function call, 939 // diagnose the problem. 940 if (SS && !SS->isEmpty()) 941 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 942 << Name << SS->getRange()); 943 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 944 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 945 return ExprError(Diag(Loc, diag::err_undeclared_use) 946 << Name.getAsString()); 947 else 948 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 949 } 950 } 951 952 // If this is an expression of the form &Class::member, don't build an 953 // implicit member ref, because we want a pointer to the member in general, 954 // not any specific instance's member. 955 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 956 DeclContext *DC = computeDeclContext(*SS); 957 if (D && isa<CXXRecordDecl>(DC)) { 958 QualType DType; 959 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 960 DType = FD->getType().getNonReferenceType(); 961 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 962 DType = Method->getType(); 963 } else if (isa<OverloadedFunctionDecl>(D)) { 964 DType = Context.OverloadTy; 965 } 966 // Could be an inner type. That's diagnosed below, so ignore it here. 967 if (!DType.isNull()) { 968 // The pointer is type- and value-dependent if it points into something 969 // dependent. 970 bool Dependent = DC->isDependentContext(); 971 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 972 } 973 } 974 } 975 976 // We may have found a field within an anonymous union or struct 977 // (C++ [class.union]). 978 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 979 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 980 return BuildAnonymousStructUnionMemberReference(Loc, FD); 981 982 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 983 if (!MD->isStatic()) { 984 // C++ [class.mfct.nonstatic]p2: 985 // [...] if name lookup (3.4.1) resolves the name in the 986 // id-expression to a nonstatic nontype member of class X or of 987 // a base class of X, the id-expression is transformed into a 988 // class member access expression (5.2.5) using (*this) (9.3.2) 989 // as the postfix-expression to the left of the '.' operator. 990 DeclContext *Ctx = 0; 991 QualType MemberType; 992 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 993 Ctx = FD->getDeclContext(); 994 MemberType = FD->getType(); 995 996 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 997 MemberType = RefType->getPointeeType(); 998 else if (!FD->isMutable()) { 999 unsigned combinedQualifiers 1000 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1001 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1002 } 1003 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1004 if (!Method->isStatic()) { 1005 Ctx = Method->getParent(); 1006 MemberType = Method->getType(); 1007 } 1008 } else if (OverloadedFunctionDecl *Ovl 1009 = dyn_cast<OverloadedFunctionDecl>(D)) { 1010 for (OverloadedFunctionDecl::function_iterator 1011 Func = Ovl->function_begin(), 1012 FuncEnd = Ovl->function_end(); 1013 Func != FuncEnd; ++Func) { 1014 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1015 if (!DMethod->isStatic()) { 1016 Ctx = Ovl->getDeclContext(); 1017 MemberType = Context.OverloadTy; 1018 break; 1019 } 1020 } 1021 } 1022 1023 if (Ctx && Ctx->isRecord()) { 1024 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1025 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1026 if ((Context.getCanonicalType(CtxType) 1027 == Context.getCanonicalType(ThisType)) || 1028 IsDerivedFrom(ThisType, CtxType)) { 1029 // Build the implicit member access expression. 1030 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1031 MD->getThisType(Context)); 1032 MarkDeclarationReferenced(Loc, D); 1033 return Owned(new (Context) MemberExpr(This, true, D, 1034 Loc, MemberType)); 1035 } 1036 } 1037 } 1038 } 1039 1040 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1041 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1042 if (MD->isStatic()) 1043 // "invalid use of member 'x' in static member function" 1044 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1045 << FD->getDeclName()); 1046 } 1047 1048 // Any other ways we could have found the field in a well-formed 1049 // program would have been turned into implicit member expressions 1050 // above. 1051 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1052 << FD->getDeclName()); 1053 } 1054 1055 if (isa<TypedefDecl>(D)) 1056 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1057 if (isa<ObjCInterfaceDecl>(D)) 1058 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1059 if (isa<NamespaceDecl>(D)) 1060 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1061 1062 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1063 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1064 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1065 false, false, SS)); 1066 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1067 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1068 false, false, SS)); 1069 ValueDecl *VD = cast<ValueDecl>(D); 1070 1071 // Check whether this declaration can be used. Note that we suppress 1072 // this check when we're going to perform argument-dependent lookup 1073 // on this function name, because this might not be the function 1074 // that overload resolution actually selects. 1075 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1076 return ExprError(); 1077 1078 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 1079 // Warn about constructs like: 1080 // if (void *X = foo()) { ... } else { X }. 1081 // In the else block, the pointer is always false. 1082 1083 // FIXME: In a template instantiation, we don't have scope 1084 // information to check this property. 1085 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 1086 Scope *CheckS = S; 1087 while (CheckS) { 1088 if (CheckS->isWithinElse() && 1089 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 1090 if (Var->getType()->isBooleanType()) 1091 ExprError(Diag(Loc, diag::warn_value_always_false) 1092 << Var->getDeclName()); 1093 else 1094 ExprError(Diag(Loc, diag::warn_value_always_zero) 1095 << Var->getDeclName()); 1096 break; 1097 } 1098 1099 // Move up one more control parent to check again. 1100 CheckS = CheckS->getControlParent(); 1101 if (CheckS) 1102 CheckS = CheckS->getParent(); 1103 } 1104 } 1105 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 1106 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1107 // C99 DR 316 says that, if a function type comes from a 1108 // function definition (without a prototype), that type is only 1109 // used for checking compatibility. Therefore, when referencing 1110 // the function, we pretend that we don't have the full function 1111 // type. 1112 QualType T = Func->getType(); 1113 QualType NoProtoType = T; 1114 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1115 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1116 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 1117 } 1118 } 1119 1120 // Only create DeclRefExpr's for valid Decl's. 1121 if (VD->isInvalidDecl()) 1122 return ExprError(); 1123 1124 // If the identifier reference is inside a block, and it refers to a value 1125 // that is outside the block, create a BlockDeclRefExpr instead of a 1126 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1127 // the block is formed. 1128 // 1129 // We do not do this for things like enum constants, global variables, etc, 1130 // as they do not get snapshotted. 1131 // 1132 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1133 MarkDeclarationReferenced(Loc, VD); 1134 QualType ExprTy = VD->getType().getNonReferenceType(); 1135 // The BlocksAttr indicates the variable is bound by-reference. 1136 if (VD->getAttr<BlocksAttr>(Context)) 1137 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1138 // This is to record that a 'const' was actually synthesize and added. 1139 bool constAdded = !ExprTy.isConstQualified(); 1140 // Variable will be bound by-copy, make it const within the closure. 1141 1142 ExprTy.addConst(); 1143 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1144 constAdded)); 1145 } 1146 // If this reference is not in a block or if the referenced variable is 1147 // within the block, create a normal DeclRefExpr. 1148 1149 bool TypeDependent = false; 1150 bool ValueDependent = false; 1151 if (getLangOptions().CPlusPlus) { 1152 // C++ [temp.dep.expr]p3: 1153 // An id-expression is type-dependent if it contains: 1154 // - an identifier that was declared with a dependent type, 1155 if (VD->getType()->isDependentType()) 1156 TypeDependent = true; 1157 // - FIXME: a template-id that is dependent, 1158 // - a conversion-function-id that specifies a dependent type, 1159 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1160 Name.getCXXNameType()->isDependentType()) 1161 TypeDependent = true; 1162 // - a nested-name-specifier that contains a class-name that 1163 // names a dependent type. 1164 else if (SS && !SS->isEmpty()) { 1165 for (DeclContext *DC = computeDeclContext(*SS); 1166 DC; DC = DC->getParent()) { 1167 // FIXME: could stop early at namespace scope. 1168 if (DC->isRecord()) { 1169 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1170 if (Context.getTypeDeclType(Record)->isDependentType()) { 1171 TypeDependent = true; 1172 break; 1173 } 1174 } 1175 } 1176 } 1177 1178 // C++ [temp.dep.constexpr]p2: 1179 // 1180 // An identifier is value-dependent if it is: 1181 // - a name declared with a dependent type, 1182 if (TypeDependent) 1183 ValueDependent = true; 1184 // - the name of a non-type template parameter, 1185 else if (isa<NonTypeTemplateParmDecl>(VD)) 1186 ValueDependent = true; 1187 // - a constant with integral or enumeration type and is 1188 // initialized with an expression that is value-dependent 1189 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1190 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1191 Dcl->getInit()) { 1192 ValueDependent = Dcl->getInit()->isValueDependent(); 1193 } 1194 } 1195 } 1196 1197 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1198 TypeDependent, ValueDependent, SS)); 1199} 1200 1201Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1202 tok::TokenKind Kind) { 1203 PredefinedExpr::IdentType IT; 1204 1205 switch (Kind) { 1206 default: assert(0 && "Unknown simple primary expr!"); 1207 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1208 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1209 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1210 } 1211 1212 // Pre-defined identifiers are of type char[x], where x is the length of the 1213 // string. 1214 unsigned Length; 1215 if (FunctionDecl *FD = getCurFunctionDecl()) 1216 Length = FD->getIdentifier()->getLength(); 1217 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1218 Length = MD->getSynthesizedMethodSize(); 1219 else { 1220 Diag(Loc, diag::ext_predef_outside_function); 1221 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1222 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1223 } 1224 1225 1226 llvm::APInt LengthI(32, Length + 1); 1227 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1228 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1229 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1230} 1231 1232Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1233 llvm::SmallString<16> CharBuffer; 1234 CharBuffer.resize(Tok.getLength()); 1235 const char *ThisTokBegin = &CharBuffer[0]; 1236 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1237 1238 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1239 Tok.getLocation(), PP); 1240 if (Literal.hadError()) 1241 return ExprError(); 1242 1243 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1244 1245 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1246 Literal.isWide(), 1247 type, Tok.getLocation())); 1248} 1249 1250Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1251 // Fast path for a single digit (which is quite common). A single digit 1252 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1253 if (Tok.getLength() == 1) { 1254 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1255 unsigned IntSize = Context.Target.getIntWidth(); 1256 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1257 Context.IntTy, Tok.getLocation())); 1258 } 1259 1260 llvm::SmallString<512> IntegerBuffer; 1261 // Add padding so that NumericLiteralParser can overread by one character. 1262 IntegerBuffer.resize(Tok.getLength()+1); 1263 const char *ThisTokBegin = &IntegerBuffer[0]; 1264 1265 // Get the spelling of the token, which eliminates trigraphs, etc. 1266 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1267 1268 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1269 Tok.getLocation(), PP); 1270 if (Literal.hadError) 1271 return ExprError(); 1272 1273 Expr *Res; 1274 1275 if (Literal.isFloatingLiteral()) { 1276 QualType Ty; 1277 if (Literal.isFloat) 1278 Ty = Context.FloatTy; 1279 else if (!Literal.isLong) 1280 Ty = Context.DoubleTy; 1281 else 1282 Ty = Context.LongDoubleTy; 1283 1284 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1285 1286 // isExact will be set by GetFloatValue(). 1287 bool isExact = false; 1288 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1289 &isExact, Ty, Tok.getLocation()); 1290 1291 } else if (!Literal.isIntegerLiteral()) { 1292 return ExprError(); 1293 } else { 1294 QualType Ty; 1295 1296 // long long is a C99 feature. 1297 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1298 Literal.isLongLong) 1299 Diag(Tok.getLocation(), diag::ext_longlong); 1300 1301 // Get the value in the widest-possible width. 1302 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1303 1304 if (Literal.GetIntegerValue(ResultVal)) { 1305 // If this value didn't fit into uintmax_t, warn and force to ull. 1306 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1307 Ty = Context.UnsignedLongLongTy; 1308 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1309 "long long is not intmax_t?"); 1310 } else { 1311 // If this value fits into a ULL, try to figure out what else it fits into 1312 // according to the rules of C99 6.4.4.1p5. 1313 1314 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1315 // be an unsigned int. 1316 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1317 1318 // Check from smallest to largest, picking the smallest type we can. 1319 unsigned Width = 0; 1320 if (!Literal.isLong && !Literal.isLongLong) { 1321 // Are int/unsigned possibilities? 1322 unsigned IntSize = Context.Target.getIntWidth(); 1323 1324 // Does it fit in a unsigned int? 1325 if (ResultVal.isIntN(IntSize)) { 1326 // Does it fit in a signed int? 1327 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1328 Ty = Context.IntTy; 1329 else if (AllowUnsigned) 1330 Ty = Context.UnsignedIntTy; 1331 Width = IntSize; 1332 } 1333 } 1334 1335 // Are long/unsigned long possibilities? 1336 if (Ty.isNull() && !Literal.isLongLong) { 1337 unsigned LongSize = Context.Target.getLongWidth(); 1338 1339 // Does it fit in a unsigned long? 1340 if (ResultVal.isIntN(LongSize)) { 1341 // Does it fit in a signed long? 1342 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1343 Ty = Context.LongTy; 1344 else if (AllowUnsigned) 1345 Ty = Context.UnsignedLongTy; 1346 Width = LongSize; 1347 } 1348 } 1349 1350 // Finally, check long long if needed. 1351 if (Ty.isNull()) { 1352 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1353 1354 // Does it fit in a unsigned long long? 1355 if (ResultVal.isIntN(LongLongSize)) { 1356 // Does it fit in a signed long long? 1357 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1358 Ty = Context.LongLongTy; 1359 else if (AllowUnsigned) 1360 Ty = Context.UnsignedLongLongTy; 1361 Width = LongLongSize; 1362 } 1363 } 1364 1365 // If we still couldn't decide a type, we probably have something that 1366 // does not fit in a signed long long, but has no U suffix. 1367 if (Ty.isNull()) { 1368 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1369 Ty = Context.UnsignedLongLongTy; 1370 Width = Context.Target.getLongLongWidth(); 1371 } 1372 1373 if (ResultVal.getBitWidth() != Width) 1374 ResultVal.trunc(Width); 1375 } 1376 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1377 } 1378 1379 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1380 if (Literal.isImaginary) 1381 Res = new (Context) ImaginaryLiteral(Res, 1382 Context.getComplexType(Res->getType())); 1383 1384 return Owned(Res); 1385} 1386 1387Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1388 SourceLocation R, ExprArg Val) { 1389 Expr *E = Val.takeAs<Expr>(); 1390 assert((E != 0) && "ActOnParenExpr() missing expr"); 1391 return Owned(new (Context) ParenExpr(L, R, E)); 1392} 1393 1394/// The UsualUnaryConversions() function is *not* called by this routine. 1395/// See C99 6.3.2.1p[2-4] for more details. 1396bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1397 SourceLocation OpLoc, 1398 const SourceRange &ExprRange, 1399 bool isSizeof) { 1400 if (exprType->isDependentType()) 1401 return false; 1402 1403 // C99 6.5.3.4p1: 1404 if (isa<FunctionType>(exprType)) { 1405 // alignof(function) is allowed as an extension. 1406 if (isSizeof) 1407 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1408 return false; 1409 } 1410 1411 // Allow sizeof(void)/alignof(void) as an extension. 1412 if (exprType->isVoidType()) { 1413 Diag(OpLoc, diag::ext_sizeof_void_type) 1414 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1415 return false; 1416 } 1417 1418 if (RequireCompleteType(OpLoc, exprType, 1419 isSizeof ? diag::err_sizeof_incomplete_type : 1420 diag::err_alignof_incomplete_type, 1421 ExprRange)) 1422 return true; 1423 1424 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1425 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1426 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1427 << exprType << isSizeof << ExprRange; 1428 return true; 1429 } 1430 1431 return false; 1432} 1433 1434bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1435 const SourceRange &ExprRange) { 1436 E = E->IgnoreParens(); 1437 1438 // alignof decl is always ok. 1439 if (isa<DeclRefExpr>(E)) 1440 return false; 1441 1442 // Cannot know anything else if the expression is dependent. 1443 if (E->isTypeDependent()) 1444 return false; 1445 1446 if (E->getBitField()) { 1447 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1448 return true; 1449 } 1450 1451 // Alignment of a field access is always okay, so long as it isn't a 1452 // bit-field. 1453 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1454 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1455 return false; 1456 1457 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1458} 1459 1460/// \brief Build a sizeof or alignof expression given a type operand. 1461Action::OwningExprResult 1462Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1463 bool isSizeOf, SourceRange R) { 1464 if (T.isNull()) 1465 return ExprError(); 1466 1467 if (!T->isDependentType() && 1468 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1469 return ExprError(); 1470 1471 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1472 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1473 Context.getSizeType(), OpLoc, 1474 R.getEnd())); 1475} 1476 1477/// \brief Build a sizeof or alignof expression given an expression 1478/// operand. 1479Action::OwningExprResult 1480Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1481 bool isSizeOf, SourceRange R) { 1482 // Verify that the operand is valid. 1483 bool isInvalid = false; 1484 if (E->isTypeDependent()) { 1485 // Delay type-checking for type-dependent expressions. 1486 } else if (!isSizeOf) { 1487 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1488 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1489 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1490 isInvalid = true; 1491 } else { 1492 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1493 } 1494 1495 if (isInvalid) 1496 return ExprError(); 1497 1498 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1499 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1500 Context.getSizeType(), OpLoc, 1501 R.getEnd())); 1502} 1503 1504/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1505/// the same for @c alignof and @c __alignof 1506/// Note that the ArgRange is invalid if isType is false. 1507Action::OwningExprResult 1508Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1509 void *TyOrEx, const SourceRange &ArgRange) { 1510 // If error parsing type, ignore. 1511 if (TyOrEx == 0) return ExprError(); 1512 1513 if (isType) { 1514 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1515 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1516 } 1517 1518 // Get the end location. 1519 Expr *ArgEx = (Expr *)TyOrEx; 1520 Action::OwningExprResult Result 1521 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1522 1523 if (Result.isInvalid()) 1524 DeleteExpr(ArgEx); 1525 1526 return move(Result); 1527} 1528 1529QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1530 if (V->isTypeDependent()) 1531 return Context.DependentTy; 1532 1533 // These operators return the element type of a complex type. 1534 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1535 return CT->getElementType(); 1536 1537 // Otherwise they pass through real integer and floating point types here. 1538 if (V->getType()->isArithmeticType()) 1539 return V->getType(); 1540 1541 // Reject anything else. 1542 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1543 << (isReal ? "__real" : "__imag"); 1544 return QualType(); 1545} 1546 1547 1548 1549Action::OwningExprResult 1550Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1551 tok::TokenKind Kind, ExprArg Input) { 1552 Expr *Arg = (Expr *)Input.get(); 1553 1554 UnaryOperator::Opcode Opc; 1555 switch (Kind) { 1556 default: assert(0 && "Unknown unary op!"); 1557 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1558 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1559 } 1560 1561 if (getLangOptions().CPlusPlus && 1562 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1563 // Which overloaded operator? 1564 OverloadedOperatorKind OverOp = 1565 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1566 1567 // C++ [over.inc]p1: 1568 // 1569 // [...] If the function is a member function with one 1570 // parameter (which shall be of type int) or a non-member 1571 // function with two parameters (the second of which shall be 1572 // of type int), it defines the postfix increment operator ++ 1573 // for objects of that type. When the postfix increment is 1574 // called as a result of using the ++ operator, the int 1575 // argument will have value zero. 1576 Expr *Args[2] = { 1577 Arg, 1578 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1579 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1580 }; 1581 1582 // Build the candidate set for overloading 1583 OverloadCandidateSet CandidateSet; 1584 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1585 1586 // Perform overload resolution. 1587 OverloadCandidateSet::iterator Best; 1588 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1589 case OR_Success: { 1590 // We found a built-in operator or an overloaded operator. 1591 FunctionDecl *FnDecl = Best->Function; 1592 1593 if (FnDecl) { 1594 // We matched an overloaded operator. Build a call to that 1595 // operator. 1596 1597 // Convert the arguments. 1598 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1599 if (PerformObjectArgumentInitialization(Arg, Method)) 1600 return ExprError(); 1601 } else { 1602 // Convert the arguments. 1603 if (PerformCopyInitialization(Arg, 1604 FnDecl->getParamDecl(0)->getType(), 1605 "passing")) 1606 return ExprError(); 1607 } 1608 1609 // Determine the result type 1610 QualType ResultTy 1611 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1612 ResultTy = ResultTy.getNonReferenceType(); 1613 1614 // Build the actual expression node. 1615 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1616 SourceLocation()); 1617 UsualUnaryConversions(FnExpr); 1618 1619 Input.release(); 1620 Args[0] = Arg; 1621 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1622 Args, 2, ResultTy, 1623 OpLoc)); 1624 } else { 1625 // We matched a built-in operator. Convert the arguments, then 1626 // break out so that we will build the appropriate built-in 1627 // operator node. 1628 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1629 "passing")) 1630 return ExprError(); 1631 1632 break; 1633 } 1634 } 1635 1636 case OR_No_Viable_Function: 1637 // No viable function; fall through to handling this as a 1638 // built-in operator, which will produce an error message for us. 1639 break; 1640 1641 case OR_Ambiguous: 1642 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1643 << UnaryOperator::getOpcodeStr(Opc) 1644 << Arg->getSourceRange(); 1645 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1646 return ExprError(); 1647 1648 case OR_Deleted: 1649 Diag(OpLoc, diag::err_ovl_deleted_oper) 1650 << Best->Function->isDeleted() 1651 << UnaryOperator::getOpcodeStr(Opc) 1652 << Arg->getSourceRange(); 1653 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1654 return ExprError(); 1655 } 1656 1657 // Either we found no viable overloaded operator or we matched a 1658 // built-in operator. In either case, fall through to trying to 1659 // build a built-in operation. 1660 } 1661 1662 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1663 Opc == UnaryOperator::PostInc); 1664 if (result.isNull()) 1665 return ExprError(); 1666 Input.release(); 1667 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1668} 1669 1670Action::OwningExprResult 1671Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1672 ExprArg Idx, SourceLocation RLoc) { 1673 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1674 *RHSExp = static_cast<Expr*>(Idx.get()); 1675 1676 if (getLangOptions().CPlusPlus && 1677 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1678 Base.release(); 1679 Idx.release(); 1680 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1681 Context.DependentTy, RLoc)); 1682 } 1683 1684 if (getLangOptions().CPlusPlus && 1685 (LHSExp->getType()->isRecordType() || 1686 LHSExp->getType()->isEnumeralType() || 1687 RHSExp->getType()->isRecordType() || 1688 RHSExp->getType()->isEnumeralType())) { 1689 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1690 // to the candidate set. 1691 OverloadCandidateSet CandidateSet; 1692 Expr *Args[2] = { LHSExp, RHSExp }; 1693 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1694 SourceRange(LLoc, RLoc)); 1695 1696 // Perform overload resolution. 1697 OverloadCandidateSet::iterator Best; 1698 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1699 case OR_Success: { 1700 // We found a built-in operator or an overloaded operator. 1701 FunctionDecl *FnDecl = Best->Function; 1702 1703 if (FnDecl) { 1704 // We matched an overloaded operator. Build a call to that 1705 // operator. 1706 1707 // Convert the arguments. 1708 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1709 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1710 PerformCopyInitialization(RHSExp, 1711 FnDecl->getParamDecl(0)->getType(), 1712 "passing")) 1713 return ExprError(); 1714 } else { 1715 // Convert the arguments. 1716 if (PerformCopyInitialization(LHSExp, 1717 FnDecl->getParamDecl(0)->getType(), 1718 "passing") || 1719 PerformCopyInitialization(RHSExp, 1720 FnDecl->getParamDecl(1)->getType(), 1721 "passing")) 1722 return ExprError(); 1723 } 1724 1725 // Determine the result type 1726 QualType ResultTy 1727 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1728 ResultTy = ResultTy.getNonReferenceType(); 1729 1730 // Build the actual expression node. 1731 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1732 SourceLocation()); 1733 UsualUnaryConversions(FnExpr); 1734 1735 Base.release(); 1736 Idx.release(); 1737 Args[0] = LHSExp; 1738 Args[1] = RHSExp; 1739 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1740 FnExpr, Args, 2, 1741 ResultTy, LLoc)); 1742 } else { 1743 // We matched a built-in operator. Convert the arguments, then 1744 // break out so that we will build the appropriate built-in 1745 // operator node. 1746 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1747 "passing") || 1748 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1749 "passing")) 1750 return ExprError(); 1751 1752 break; 1753 } 1754 } 1755 1756 case OR_No_Viable_Function: 1757 // No viable function; fall through to handling this as a 1758 // built-in operator, which will produce an error message for us. 1759 break; 1760 1761 case OR_Ambiguous: 1762 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1763 << "[]" 1764 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1765 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1766 return ExprError(); 1767 1768 case OR_Deleted: 1769 Diag(LLoc, diag::err_ovl_deleted_oper) 1770 << Best->Function->isDeleted() 1771 << "[]" 1772 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1773 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1774 return ExprError(); 1775 } 1776 1777 // Either we found no viable overloaded operator or we matched a 1778 // built-in operator. In either case, fall through to trying to 1779 // build a built-in operation. 1780 } 1781 1782 // Perform default conversions. 1783 DefaultFunctionArrayConversion(LHSExp); 1784 DefaultFunctionArrayConversion(RHSExp); 1785 1786 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1787 1788 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1789 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1790 // in the subscript position. As a result, we need to derive the array base 1791 // and index from the expression types. 1792 Expr *BaseExpr, *IndexExpr; 1793 QualType ResultType; 1794 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1795 BaseExpr = LHSExp; 1796 IndexExpr = RHSExp; 1797 ResultType = Context.DependentTy; 1798 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1799 BaseExpr = LHSExp; 1800 IndexExpr = RHSExp; 1801 ResultType = PTy->getPointeeType(); 1802 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1803 // Handle the uncommon case of "123[Ptr]". 1804 BaseExpr = RHSExp; 1805 IndexExpr = LHSExp; 1806 ResultType = PTy->getPointeeType(); 1807 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1808 BaseExpr = LHSExp; // vectors: V[123] 1809 IndexExpr = RHSExp; 1810 1811 // FIXME: need to deal with const... 1812 ResultType = VTy->getElementType(); 1813 } else if (LHSTy->isArrayType()) { 1814 // If we see an array that wasn't promoted by 1815 // DefaultFunctionArrayConversion, it must be an array that 1816 // wasn't promoted because of the C90 rule that doesn't 1817 // allow promoting non-lvalue arrays. Warn, then 1818 // force the promotion here. 1819 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1820 LHSExp->getSourceRange(); 1821 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1822 LHSTy = LHSExp->getType(); 1823 1824 BaseExpr = LHSExp; 1825 IndexExpr = RHSExp; 1826 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1827 } else if (RHSTy->isArrayType()) { 1828 // Same as previous, except for 123[f().a] case 1829 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1830 RHSExp->getSourceRange(); 1831 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1832 RHSTy = RHSExp->getType(); 1833 1834 BaseExpr = RHSExp; 1835 IndexExpr = LHSExp; 1836 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1837 } else { 1838 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1839 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1840 } 1841 // C99 6.5.2.1p1 1842 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1843 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1844 << IndexExpr->getSourceRange()); 1845 1846 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1847 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1848 // type. Note that Functions are not objects, and that (in C99 parlance) 1849 // incomplete types are not object types. 1850 if (ResultType->isFunctionType()) { 1851 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1852 << ResultType << BaseExpr->getSourceRange(); 1853 return ExprError(); 1854 } 1855 1856 if (!ResultType->isDependentType() && 1857 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1858 BaseExpr->getSourceRange())) 1859 return ExprError(); 1860 1861 // Diagnose bad cases where we step over interface counts. 1862 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1863 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1864 << ResultType << BaseExpr->getSourceRange(); 1865 return ExprError(); 1866 } 1867 1868 Base.release(); 1869 Idx.release(); 1870 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1871 ResultType, RLoc)); 1872} 1873 1874QualType Sema:: 1875CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1876 IdentifierInfo &CompName, SourceLocation CompLoc) { 1877 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1878 1879 // The vector accessor can't exceed the number of elements. 1880 const char *compStr = CompName.getName(); 1881 1882 // This flag determines whether or not the component is one of the four 1883 // special names that indicate a subset of exactly half the elements are 1884 // to be selected. 1885 bool HalvingSwizzle = false; 1886 1887 // This flag determines whether or not CompName has an 's' char prefix, 1888 // indicating that it is a string of hex values to be used as vector indices. 1889 bool HexSwizzle = *compStr == 's'; 1890 1891 // Check that we've found one of the special components, or that the component 1892 // names must come from the same set. 1893 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1894 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1895 HalvingSwizzle = true; 1896 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1897 do 1898 compStr++; 1899 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1900 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1901 do 1902 compStr++; 1903 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1904 } 1905 1906 if (!HalvingSwizzle && *compStr) { 1907 // We didn't get to the end of the string. This means the component names 1908 // didn't come from the same set *or* we encountered an illegal name. 1909 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1910 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1911 return QualType(); 1912 } 1913 1914 // Ensure no component accessor exceeds the width of the vector type it 1915 // operates on. 1916 if (!HalvingSwizzle) { 1917 compStr = CompName.getName(); 1918 1919 if (HexSwizzle) 1920 compStr++; 1921 1922 while (*compStr) { 1923 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1924 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1925 << baseType << SourceRange(CompLoc); 1926 return QualType(); 1927 } 1928 } 1929 } 1930 1931 // If this is a halving swizzle, verify that the base type has an even 1932 // number of elements. 1933 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1934 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1935 << baseType << SourceRange(CompLoc); 1936 return QualType(); 1937 } 1938 1939 // The component accessor looks fine - now we need to compute the actual type. 1940 // The vector type is implied by the component accessor. For example, 1941 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1942 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1943 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1944 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1945 : CompName.getLength(); 1946 if (HexSwizzle) 1947 CompSize--; 1948 1949 if (CompSize == 1) 1950 return vecType->getElementType(); 1951 1952 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1953 // Now look up the TypeDefDecl from the vector type. Without this, 1954 // diagostics look bad. We want extended vector types to appear built-in. 1955 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1956 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1957 return Context.getTypedefType(ExtVectorDecls[i]); 1958 } 1959 return VT; // should never get here (a typedef type should always be found). 1960} 1961 1962static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1963 IdentifierInfo &Member, 1964 const Selector &Sel, 1965 ASTContext &Context) { 1966 1967 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1968 return PD; 1969 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1970 return OMD; 1971 1972 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1973 E = PDecl->protocol_end(); I != E; ++I) { 1974 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1975 Context)) 1976 return D; 1977 } 1978 return 0; 1979} 1980 1981static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1982 IdentifierInfo &Member, 1983 const Selector &Sel, 1984 ASTContext &Context) { 1985 // Check protocols on qualified interfaces. 1986 Decl *GDecl = 0; 1987 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1988 E = QIdTy->qual_end(); I != E; ++I) { 1989 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1990 GDecl = PD; 1991 break; 1992 } 1993 // Also must look for a getter name which uses property syntax. 1994 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1995 GDecl = OMD; 1996 break; 1997 } 1998 } 1999 if (!GDecl) { 2000 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2001 E = QIdTy->qual_end(); I != E; ++I) { 2002 // Search in the protocol-qualifier list of current protocol. 2003 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2004 if (GDecl) 2005 return GDecl; 2006 } 2007 } 2008 return GDecl; 2009} 2010 2011/// FindMethodInNestedImplementations - Look up a method in current and 2012/// all base class implementations. 2013/// 2014ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2015 const ObjCInterfaceDecl *IFace, 2016 const Selector &Sel) { 2017 ObjCMethodDecl *Method = 0; 2018 if (ObjCImplementationDecl *ImpDecl 2019 = LookupObjCImplementation(IFace->getIdentifier())) 2020 Method = ImpDecl->getInstanceMethod(Context, Sel); 2021 2022 if (!Method && IFace->getSuperClass()) 2023 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2024 return Method; 2025} 2026 2027Action::OwningExprResult 2028Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2029 tok::TokenKind OpKind, SourceLocation MemberLoc, 2030 IdentifierInfo &Member, 2031 DeclPtrTy ObjCImpDecl) { 2032 Expr *BaseExpr = Base.takeAs<Expr>(); 2033 assert(BaseExpr && "no record expression"); 2034 2035 // Perform default conversions. 2036 DefaultFunctionArrayConversion(BaseExpr); 2037 2038 QualType BaseType = BaseExpr->getType(); 2039 assert(!BaseType.isNull() && "no type for member expression"); 2040 2041 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2042 // must have pointer type, and the accessed type is the pointee. 2043 if (OpKind == tok::arrow) { 2044 if (BaseType->isDependentType()) 2045 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2046 BaseExpr, true, 2047 OpLoc, 2048 DeclarationName(&Member), 2049 MemberLoc)); 2050 else if (const PointerType *PT = BaseType->getAsPointerType()) 2051 BaseType = PT->getPointeeType(); 2052 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2053 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2054 MemberLoc, Member)); 2055 else 2056 return ExprError(Diag(MemberLoc, 2057 diag::err_typecheck_member_reference_arrow) 2058 << BaseType << BaseExpr->getSourceRange()); 2059 } else { 2060 if (BaseType->isDependentType()) { 2061 // Require that the base type isn't a pointer type 2062 // (so we'll report an error for) 2063 // T* t; 2064 // t.f; 2065 // 2066 // In Obj-C++, however, the above expression is valid, since it could be 2067 // accessing the 'f' property if T is an Obj-C interface. The extra check 2068 // allows this, while still reporting an error if T is a struct pointer. 2069 const PointerType *PT = BaseType->getAsPointerType(); 2070 2071 if (!PT || (getLangOptions().ObjC1 && 2072 !PT->getPointeeType()->isRecordType())) 2073 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2074 BaseExpr, false, 2075 OpLoc, 2076 DeclarationName(&Member), 2077 MemberLoc)); 2078 } 2079 } 2080 2081 // Handle field access to simple records. This also handles access to fields 2082 // of the ObjC 'id' struct. 2083 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2084 RecordDecl *RDecl = RTy->getDecl(); 2085 if (RequireCompleteType(OpLoc, BaseType, 2086 diag::err_typecheck_incomplete_tag, 2087 BaseExpr->getSourceRange())) 2088 return ExprError(); 2089 2090 // The record definition is complete, now make sure the member is valid. 2091 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2092 LookupResult Result 2093 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2094 LookupMemberName, false); 2095 2096 if (!Result) 2097 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2098 << &Member << BaseExpr->getSourceRange()); 2099 if (Result.isAmbiguous()) { 2100 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2101 MemberLoc, BaseExpr->getSourceRange()); 2102 return ExprError(); 2103 } 2104 2105 NamedDecl *MemberDecl = Result; 2106 2107 // If the decl being referenced had an error, return an error for this 2108 // sub-expr without emitting another error, in order to avoid cascading 2109 // error cases. 2110 if (MemberDecl->isInvalidDecl()) 2111 return ExprError(); 2112 2113 // Check the use of this field 2114 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2115 return ExprError(); 2116 2117 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2118 // We may have found a field within an anonymous union or struct 2119 // (C++ [class.union]). 2120 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2121 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2122 BaseExpr, OpLoc); 2123 2124 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2125 // FIXME: Handle address space modifiers 2126 QualType MemberType = FD->getType(); 2127 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2128 MemberType = Ref->getPointeeType(); 2129 else { 2130 unsigned combinedQualifiers = 2131 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2132 if (FD->isMutable()) 2133 combinedQualifiers &= ~QualType::Const; 2134 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2135 } 2136 2137 MarkDeclarationReferenced(MemberLoc, FD); 2138 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2139 MemberLoc, MemberType)); 2140 } 2141 2142 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2143 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2144 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2145 Var, MemberLoc, 2146 Var->getType().getNonReferenceType())); 2147 } 2148 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2149 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2150 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2151 MemberFn, MemberLoc, 2152 MemberFn->getType())); 2153 } 2154 if (OverloadedFunctionDecl *Ovl 2155 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2156 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2157 MemberLoc, Context.OverloadTy)); 2158 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2159 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2160 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2161 Enum, MemberLoc, Enum->getType())); 2162 } 2163 if (isa<TypeDecl>(MemberDecl)) 2164 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2165 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2166 2167 // We found a declaration kind that we didn't expect. This is a 2168 // generic error message that tells the user that she can't refer 2169 // to this member with '.' or '->'. 2170 return ExprError(Diag(MemberLoc, 2171 diag::err_typecheck_member_reference_unknown) 2172 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2173 } 2174 2175 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2176 // (*Obj).ivar. 2177 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2178 ObjCInterfaceDecl *ClassDeclared; 2179 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2180 &Member, 2181 ClassDeclared)) { 2182 // If the decl being referenced had an error, return an error for this 2183 // sub-expr without emitting another error, in order to avoid cascading 2184 // error cases. 2185 if (IV->isInvalidDecl()) 2186 return ExprError(); 2187 2188 // Check whether we can reference this field. 2189 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2190 return ExprError(); 2191 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2192 IV->getAccessControl() != ObjCIvarDecl::Package) { 2193 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2194 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2195 ClassOfMethodDecl = MD->getClassInterface(); 2196 else if (ObjCImpDecl && getCurFunctionDecl()) { 2197 // Case of a c-function declared inside an objc implementation. 2198 // FIXME: For a c-style function nested inside an objc implementation 2199 // class, there is no implementation context available, so we pass 2200 // down the context as argument to this routine. Ideally, this context 2201 // need be passed down in the AST node and somehow calculated from the 2202 // AST for a function decl. 2203 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2204 if (ObjCImplementationDecl *IMPD = 2205 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2206 ClassOfMethodDecl = IMPD->getClassInterface(); 2207 else if (ObjCCategoryImplDecl* CatImplClass = 2208 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2209 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2210 } 2211 2212 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2213 if (ClassDeclared != IFTy->getDecl() || 2214 ClassOfMethodDecl != ClassDeclared) 2215 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2216 } 2217 // @protected 2218 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2219 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2220 } 2221 2222 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2223 MemberLoc, BaseExpr, 2224 OpKind == tok::arrow)); 2225 } 2226 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2227 << IFTy->getDecl()->getDeclName() << &Member 2228 << BaseExpr->getSourceRange()); 2229 } 2230 2231 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2232 // pointer to a (potentially qualified) interface type. 2233 const PointerType *PTy; 2234 const ObjCInterfaceType *IFTy; 2235 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2236 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2237 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2238 2239 // Search for a declared property first. 2240 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2241 &Member)) { 2242 // Check whether we can reference this property. 2243 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2244 return ExprError(); 2245 QualType ResTy = PD->getType(); 2246 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2247 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2248 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2249 ResTy = Getter->getResultType(); 2250 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2251 MemberLoc, BaseExpr)); 2252 } 2253 2254 // Check protocols on qualified interfaces. 2255 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2256 E = IFTy->qual_end(); I != E; ++I) 2257 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2258 &Member)) { 2259 // Check whether we can reference this property. 2260 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2261 return ExprError(); 2262 2263 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2264 MemberLoc, BaseExpr)); 2265 } 2266 2267 // If that failed, look for an "implicit" property by seeing if the nullary 2268 // selector is implemented. 2269 2270 // FIXME: The logic for looking up nullary and unary selectors should be 2271 // shared with the code in ActOnInstanceMessage. 2272 2273 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2274 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2275 2276 // If this reference is in an @implementation, check for 'private' methods. 2277 if (!Getter) 2278 Getter = FindMethodInNestedImplementations(IFace, Sel); 2279 2280 // Look through local category implementations associated with the class. 2281 if (!Getter) { 2282 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2283 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2284 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2285 } 2286 } 2287 if (Getter) { 2288 // Check if we can reference this property. 2289 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2290 return ExprError(); 2291 } 2292 // If we found a getter then this may be a valid dot-reference, we 2293 // will look for the matching setter, in case it is needed. 2294 Selector SetterSel = 2295 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2296 PP.getSelectorTable(), &Member); 2297 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2298 if (!Setter) { 2299 // If this reference is in an @implementation, also check for 'private' 2300 // methods. 2301 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2302 } 2303 // Look through local category implementations associated with the class. 2304 if (!Setter) { 2305 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2306 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2307 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2308 } 2309 } 2310 2311 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2312 return ExprError(); 2313 2314 if (Getter || Setter) { 2315 QualType PType; 2316 2317 if (Getter) 2318 PType = Getter->getResultType(); 2319 else { 2320 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2321 E = Setter->param_end(); PI != E; ++PI) 2322 PType = (*PI)->getType(); 2323 } 2324 // FIXME: we must check that the setter has property type. 2325 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2326 Setter, MemberLoc, BaseExpr)); 2327 } 2328 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2329 << &Member << BaseType); 2330 } 2331 // Handle properties on qualified "id" protocols. 2332 const ObjCObjectPointerType *QIdTy; 2333 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2334 // Check protocols on qualified interfaces. 2335 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2336 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2337 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2338 // Check the use of this declaration 2339 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2340 return ExprError(); 2341 2342 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2343 MemberLoc, BaseExpr)); 2344 } 2345 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2346 // Check the use of this method. 2347 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2348 return ExprError(); 2349 2350 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2351 OMD->getResultType(), 2352 OMD, OpLoc, MemberLoc, 2353 NULL, 0)); 2354 } 2355 } 2356 2357 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2358 << &Member << BaseType); 2359 } 2360 // Handle properties on ObjC 'Class' types. 2361 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2362 // Also must look for a getter name which uses property syntax. 2363 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2364 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2365 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2366 ObjCMethodDecl *Getter; 2367 // FIXME: need to also look locally in the implementation. 2368 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2369 // Check the use of this method. 2370 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2371 return ExprError(); 2372 } 2373 // If we found a getter then this may be a valid dot-reference, we 2374 // will look for the matching setter, in case it is needed. 2375 Selector SetterSel = 2376 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2377 PP.getSelectorTable(), &Member); 2378 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2379 if (!Setter) { 2380 // If this reference is in an @implementation, also check for 'private' 2381 // methods. 2382 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2383 } 2384 // Look through local category implementations associated with the class. 2385 if (!Setter) { 2386 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2387 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2388 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2389 } 2390 } 2391 2392 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2393 return ExprError(); 2394 2395 if (Getter || Setter) { 2396 QualType PType; 2397 2398 if (Getter) 2399 PType = Getter->getResultType(); 2400 else { 2401 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2402 E = Setter->param_end(); PI != E; ++PI) 2403 PType = (*PI)->getType(); 2404 } 2405 // FIXME: we must check that the setter has property type. 2406 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2407 Setter, MemberLoc, BaseExpr)); 2408 } 2409 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2410 << &Member << BaseType); 2411 } 2412 } 2413 2414 // Handle 'field access' to vectors, such as 'V.xx'. 2415 if (BaseType->isExtVectorType()) { 2416 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2417 if (ret.isNull()) 2418 return ExprError(); 2419 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2420 MemberLoc)); 2421 } 2422 2423 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2424 << BaseType << BaseExpr->getSourceRange(); 2425 2426 // If the user is trying to apply -> or . to a function or function 2427 // pointer, it's probably because they forgot parentheses to call 2428 // the function. Suggest the addition of those parentheses. 2429 if (BaseType == Context.OverloadTy || 2430 BaseType->isFunctionType() || 2431 (BaseType->isPointerType() && 2432 BaseType->getAsPointerType()->isFunctionType())) { 2433 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2434 Diag(Loc, diag::note_member_reference_needs_call) 2435 << CodeModificationHint::CreateInsertion(Loc, "()"); 2436 } 2437 2438 return ExprError(); 2439} 2440 2441/// ConvertArgumentsForCall - Converts the arguments specified in 2442/// Args/NumArgs to the parameter types of the function FDecl with 2443/// function prototype Proto. Call is the call expression itself, and 2444/// Fn is the function expression. For a C++ member function, this 2445/// routine does not attempt to convert the object argument. Returns 2446/// true if the call is ill-formed. 2447bool 2448Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2449 FunctionDecl *FDecl, 2450 const FunctionProtoType *Proto, 2451 Expr **Args, unsigned NumArgs, 2452 SourceLocation RParenLoc) { 2453 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2454 // assignment, to the types of the corresponding parameter, ... 2455 unsigned NumArgsInProto = Proto->getNumArgs(); 2456 unsigned NumArgsToCheck = NumArgs; 2457 bool Invalid = false; 2458 2459 // If too few arguments are available (and we don't have default 2460 // arguments for the remaining parameters), don't make the call. 2461 if (NumArgs < NumArgsInProto) { 2462 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2463 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2464 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2465 // Use default arguments for missing arguments 2466 NumArgsToCheck = NumArgsInProto; 2467 Call->setNumArgs(Context, NumArgsInProto); 2468 } 2469 2470 // If too many are passed and not variadic, error on the extras and drop 2471 // them. 2472 if (NumArgs > NumArgsInProto) { 2473 if (!Proto->isVariadic()) { 2474 Diag(Args[NumArgsInProto]->getLocStart(), 2475 diag::err_typecheck_call_too_many_args) 2476 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2477 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2478 Args[NumArgs-1]->getLocEnd()); 2479 // This deletes the extra arguments. 2480 Call->setNumArgs(Context, NumArgsInProto); 2481 Invalid = true; 2482 } 2483 NumArgsToCheck = NumArgsInProto; 2484 } 2485 2486 // Continue to check argument types (even if we have too few/many args). 2487 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2488 QualType ProtoArgType = Proto->getArgType(i); 2489 2490 Expr *Arg; 2491 if (i < NumArgs) { 2492 Arg = Args[i]; 2493 2494 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2495 ProtoArgType, 2496 diag::err_call_incomplete_argument, 2497 Arg->getSourceRange())) 2498 return true; 2499 2500 // Pass the argument. 2501 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2502 return true; 2503 } else { 2504 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2505 Diag (Call->getSourceRange().getBegin(), 2506 diag::err_use_of_default_argument_to_function_declared_later) << 2507 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2508 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2509 diag::note_default_argument_declared_here); 2510 } else { 2511 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2512 2513 // If the default expression creates temporaries, we need to 2514 // push them to the current stack of expression temporaries so they'll 2515 // be properly destroyed. 2516 if (CXXExprWithTemporaries *E 2517 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2518 assert(!E->shouldDestroyTemporaries() && 2519 "Can't destroy temporaries in a default argument expr!"); 2520 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2521 ExprTemporaries.push_back(E->getTemporary(I)); 2522 } 2523 } 2524 2525 // We already type-checked the argument, so we know it works. 2526 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2527 } 2528 2529 QualType ArgType = Arg->getType(); 2530 2531 Call->setArg(i, Arg); 2532 } 2533 2534 // If this is a variadic call, handle args passed through "...". 2535 if (Proto->isVariadic()) { 2536 VariadicCallType CallType = VariadicFunction; 2537 if (Fn->getType()->isBlockPointerType()) 2538 CallType = VariadicBlock; // Block 2539 else if (isa<MemberExpr>(Fn)) 2540 CallType = VariadicMethod; 2541 2542 // Promote the arguments (C99 6.5.2.2p7). 2543 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2544 Expr *Arg = Args[i]; 2545 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2546 Call->setArg(i, Arg); 2547 } 2548 } 2549 2550 return Invalid; 2551} 2552 2553/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2554/// This provides the location of the left/right parens and a list of comma 2555/// locations. 2556Action::OwningExprResult 2557Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2558 MultiExprArg args, 2559 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2560 unsigned NumArgs = args.size(); 2561 Expr *Fn = fn.takeAs<Expr>(); 2562 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2563 assert(Fn && "no function call expression"); 2564 FunctionDecl *FDecl = NULL; 2565 NamedDecl *NDecl = NULL; 2566 DeclarationName UnqualifiedName; 2567 2568 if (getLangOptions().CPlusPlus) { 2569 // Determine whether this is a dependent call inside a C++ template, 2570 // in which case we won't do any semantic analysis now. 2571 // FIXME: Will need to cache the results of name lookup (including ADL) in 2572 // Fn. 2573 bool Dependent = false; 2574 if (Fn->isTypeDependent()) 2575 Dependent = true; 2576 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2577 Dependent = true; 2578 2579 if (Dependent) 2580 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2581 Context.DependentTy, RParenLoc)); 2582 2583 // Determine whether this is a call to an object (C++ [over.call.object]). 2584 if (Fn->getType()->isRecordType()) 2585 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2586 CommaLocs, RParenLoc)); 2587 2588 // Determine whether this is a call to a member function. 2589 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2590 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2591 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2592 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2593 CommaLocs, RParenLoc)); 2594 } 2595 2596 // If we're directly calling a function, get the appropriate declaration. 2597 DeclRefExpr *DRExpr = NULL; 2598 Expr *FnExpr = Fn; 2599 bool ADL = true; 2600 while (true) { 2601 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2602 FnExpr = IcExpr->getSubExpr(); 2603 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2604 // Parentheses around a function disable ADL 2605 // (C++0x [basic.lookup.argdep]p1). 2606 ADL = false; 2607 FnExpr = PExpr->getSubExpr(); 2608 } else if (isa<UnaryOperator>(FnExpr) && 2609 cast<UnaryOperator>(FnExpr)->getOpcode() 2610 == UnaryOperator::AddrOf) { 2611 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2612 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2613 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2614 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2615 break; 2616 } else if (UnresolvedFunctionNameExpr *DepName 2617 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2618 UnqualifiedName = DepName->getName(); 2619 break; 2620 } else { 2621 // Any kind of name that does not refer to a declaration (or 2622 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2623 ADL = false; 2624 break; 2625 } 2626 } 2627 2628 OverloadedFunctionDecl *Ovl = 0; 2629 if (DRExpr) { 2630 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2631 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2632 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2633 } 2634 2635 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2636 // We don't perform ADL for implicit declarations of builtins. 2637 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2638 ADL = false; 2639 2640 // We don't perform ADL in C. 2641 if (!getLangOptions().CPlusPlus) 2642 ADL = false; 2643 2644 if (Ovl || ADL) { 2645 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2646 UnqualifiedName, LParenLoc, Args, 2647 NumArgs, CommaLocs, RParenLoc, ADL); 2648 if (!FDecl) 2649 return ExprError(); 2650 2651 // Update Fn to refer to the actual function selected. 2652 Expr *NewFn = 0; 2653 if (QualifiedDeclRefExpr *QDRExpr 2654 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2655 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2656 QDRExpr->getLocation(), 2657 false, false, 2658 QDRExpr->getQualifierRange(), 2659 QDRExpr->getQualifier()); 2660 else 2661 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2662 Fn->getSourceRange().getBegin()); 2663 Fn->Destroy(Context); 2664 Fn = NewFn; 2665 } 2666 } 2667 2668 // Promote the function operand. 2669 UsualUnaryConversions(Fn); 2670 2671 // Make the call expr early, before semantic checks. This guarantees cleanup 2672 // of arguments and function on error. 2673 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2674 Args, NumArgs, 2675 Context.BoolTy, 2676 RParenLoc)); 2677 2678 const FunctionType *FuncT; 2679 if (!Fn->getType()->isBlockPointerType()) { 2680 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2681 // have type pointer to function". 2682 const PointerType *PT = Fn->getType()->getAsPointerType(); 2683 if (PT == 0) 2684 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2685 << Fn->getType() << Fn->getSourceRange()); 2686 FuncT = PT->getPointeeType()->getAsFunctionType(); 2687 } else { // This is a block call. 2688 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2689 getAsFunctionType(); 2690 } 2691 if (FuncT == 0) 2692 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2693 << Fn->getType() << Fn->getSourceRange()); 2694 2695 // Check for a valid return type 2696 if (!FuncT->getResultType()->isVoidType() && 2697 RequireCompleteType(Fn->getSourceRange().getBegin(), 2698 FuncT->getResultType(), 2699 diag::err_call_incomplete_return, 2700 TheCall->getSourceRange())) 2701 return ExprError(); 2702 2703 // We know the result type of the call, set it. 2704 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2705 2706 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2707 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2708 RParenLoc)) 2709 return ExprError(); 2710 } else { 2711 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2712 2713 if (FDecl) { 2714 // Check if we have too few/too many template arguments, based 2715 // on our knowledge of the function definition. 2716 const FunctionDecl *Def = 0; 2717 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) { 2718 const FunctionProtoType *Proto = 2719 Def->getType()->getAsFunctionProtoType(); 2720 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2721 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2722 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2723 } 2724 } 2725 } 2726 2727 // Promote the arguments (C99 6.5.2.2p6). 2728 for (unsigned i = 0; i != NumArgs; i++) { 2729 Expr *Arg = Args[i]; 2730 DefaultArgumentPromotion(Arg); 2731 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2732 Arg->getType(), 2733 diag::err_call_incomplete_argument, 2734 Arg->getSourceRange())) 2735 return ExprError(); 2736 TheCall->setArg(i, Arg); 2737 } 2738 } 2739 2740 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2741 if (!Method->isStatic()) 2742 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2743 << Fn->getSourceRange()); 2744 2745 // Check for sentinels 2746 if (NDecl) 2747 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2748 // Do special checking on direct calls to functions. 2749 if (FDecl) 2750 return CheckFunctionCall(FDecl, TheCall.take()); 2751 if (NDecl) 2752 return CheckBlockCall(NDecl, TheCall.take()); 2753 2754 return Owned(TheCall.take()); 2755} 2756 2757Action::OwningExprResult 2758Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2759 SourceLocation RParenLoc, ExprArg InitExpr) { 2760 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2761 QualType literalType = QualType::getFromOpaquePtr(Ty); 2762 // FIXME: put back this assert when initializers are worked out. 2763 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2764 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2765 2766 if (literalType->isArrayType()) { 2767 if (literalType->isVariableArrayType()) 2768 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2769 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2770 } else if (!literalType->isDependentType() && 2771 RequireCompleteType(LParenLoc, literalType, 2772 diag::err_typecheck_decl_incomplete_type, 2773 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2774 return ExprError(); 2775 2776 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2777 DeclarationName(), /*FIXME:DirectInit=*/false)) 2778 return ExprError(); 2779 2780 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2781 if (isFileScope) { // 6.5.2.5p3 2782 if (CheckForConstantInitializer(literalExpr, literalType)) 2783 return ExprError(); 2784 } 2785 InitExpr.release(); 2786 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2787 literalExpr, isFileScope)); 2788} 2789 2790Action::OwningExprResult 2791Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2792 SourceLocation RBraceLoc) { 2793 unsigned NumInit = initlist.size(); 2794 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2795 2796 // Semantic analysis for initializers is done by ActOnDeclarator() and 2797 // CheckInitializer() - it requires knowledge of the object being intialized. 2798 2799 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2800 RBraceLoc); 2801 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2802 return Owned(E); 2803} 2804 2805/// CheckCastTypes - Check type constraints for casting between types. 2806bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2807 UsualUnaryConversions(castExpr); 2808 2809 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2810 // type needs to be scalar. 2811 if (castType->isVoidType()) { 2812 // Cast to void allows any expr type. 2813 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2814 // We can't check any more until template instantiation time. 2815 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2816 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2817 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2818 (castType->isStructureType() || castType->isUnionType())) { 2819 // GCC struct/union extension: allow cast to self. 2820 // FIXME: Check that the cast destination type is complete. 2821 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2822 << castType << castExpr->getSourceRange(); 2823 } else if (castType->isUnionType()) { 2824 // GCC cast to union extension 2825 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2826 RecordDecl::field_iterator Field, FieldEnd; 2827 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2828 Field != FieldEnd; ++Field) { 2829 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2830 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2831 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2832 << castExpr->getSourceRange(); 2833 break; 2834 } 2835 } 2836 if (Field == FieldEnd) 2837 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2838 << castExpr->getType() << castExpr->getSourceRange(); 2839 } else { 2840 // Reject any other conversions to non-scalar types. 2841 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2842 << castType << castExpr->getSourceRange(); 2843 } 2844 } else if (!castExpr->getType()->isScalarType() && 2845 !castExpr->getType()->isVectorType()) { 2846 return Diag(castExpr->getLocStart(), 2847 diag::err_typecheck_expect_scalar_operand) 2848 << castExpr->getType() << castExpr->getSourceRange(); 2849 } else if (castExpr->getType()->isVectorType()) { 2850 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2851 return true; 2852 } else if (castType->isVectorType()) { 2853 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2854 return true; 2855 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2856 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2857 } else if (!castType->isArithmeticType()) { 2858 QualType castExprType = castExpr->getType(); 2859 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2860 return Diag(castExpr->getLocStart(), 2861 diag::err_cast_pointer_from_non_pointer_int) 2862 << castExprType << castExpr->getSourceRange(); 2863 } else if (!castExpr->getType()->isArithmeticType()) { 2864 if (!castType->isIntegralType() && castType->isArithmeticType()) 2865 return Diag(castExpr->getLocStart(), 2866 diag::err_cast_pointer_to_non_pointer_int) 2867 << castType << castExpr->getSourceRange(); 2868 } 2869 if (isa<ObjCSelectorExpr>(castExpr)) 2870 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2871 return false; 2872} 2873 2874bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2875 assert(VectorTy->isVectorType() && "Not a vector type!"); 2876 2877 if (Ty->isVectorType() || Ty->isIntegerType()) { 2878 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2879 return Diag(R.getBegin(), 2880 Ty->isVectorType() ? 2881 diag::err_invalid_conversion_between_vectors : 2882 diag::err_invalid_conversion_between_vector_and_integer) 2883 << VectorTy << Ty << R; 2884 } else 2885 return Diag(R.getBegin(), 2886 diag::err_invalid_conversion_between_vector_and_scalar) 2887 << VectorTy << Ty << R; 2888 2889 return false; 2890} 2891 2892Action::OwningExprResult 2893Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2894 SourceLocation RParenLoc, ExprArg Op) { 2895 assert((Ty != 0) && (Op.get() != 0) && 2896 "ActOnCastExpr(): missing type or expr"); 2897 2898 Expr *castExpr = Op.takeAs<Expr>(); 2899 QualType castType = QualType::getFromOpaquePtr(Ty); 2900 2901 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2902 return ExprError(); 2903 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2904 LParenLoc, RParenLoc)); 2905} 2906 2907/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2908/// In that case, lhs = cond. 2909/// C99 6.5.15 2910QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2911 SourceLocation QuestionLoc) { 2912 // C++ is sufficiently different to merit its own checker. 2913 if (getLangOptions().CPlusPlus) 2914 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2915 2916 UsualUnaryConversions(Cond); 2917 UsualUnaryConversions(LHS); 2918 UsualUnaryConversions(RHS); 2919 QualType CondTy = Cond->getType(); 2920 QualType LHSTy = LHS->getType(); 2921 QualType RHSTy = RHS->getType(); 2922 2923 // first, check the condition. 2924 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2925 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2926 << CondTy; 2927 return QualType(); 2928 } 2929 2930 // Now check the two expressions. 2931 2932 // If both operands have arithmetic type, do the usual arithmetic conversions 2933 // to find a common type: C99 6.5.15p3,5. 2934 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2935 UsualArithmeticConversions(LHS, RHS); 2936 return LHS->getType(); 2937 } 2938 2939 // If both operands are the same structure or union type, the result is that 2940 // type. 2941 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2942 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2943 if (LHSRT->getDecl() == RHSRT->getDecl()) 2944 // "If both the operands have structure or union type, the result has 2945 // that type." This implies that CV qualifiers are dropped. 2946 return LHSTy.getUnqualifiedType(); 2947 // FIXME: Type of conditional expression must be complete in C mode. 2948 } 2949 2950 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2951 // The following || allows only one side to be void (a GCC-ism). 2952 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2953 if (!LHSTy->isVoidType()) 2954 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2955 << RHS->getSourceRange(); 2956 if (!RHSTy->isVoidType()) 2957 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2958 << LHS->getSourceRange(); 2959 ImpCastExprToType(LHS, Context.VoidTy); 2960 ImpCastExprToType(RHS, Context.VoidTy); 2961 return Context.VoidTy; 2962 } 2963 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2964 // the type of the other operand." 2965 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2966 Context.isObjCObjectPointerType(LHSTy)) && 2967 RHS->isNullPointerConstant(Context)) { 2968 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2969 return LHSTy; 2970 } 2971 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2972 Context.isObjCObjectPointerType(RHSTy)) && 2973 LHS->isNullPointerConstant(Context)) { 2974 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2975 return RHSTy; 2976 } 2977 2978 const PointerType *LHSPT = LHSTy->getAsPointerType(); 2979 const PointerType *RHSPT = RHSTy->getAsPointerType(); 2980 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 2981 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); 2982 2983 // Handle the case where both operands are pointers before we handle null 2984 // pointer constants in case both operands are null pointer constants. 2985 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 2986 // get the "pointed to" types 2987 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 2988 : LHSBPT->getPointeeType()); 2989 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 2990 : RHSBPT->getPointeeType()); 2991 2992 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2993 if (lhptee->isVoidType() 2994 && (RHSBPT || rhptee->isIncompleteOrObjectType())) { 2995 // Figure out necessary qualifiers (C99 6.5.15p6) 2996 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2997 QualType destType = Context.getPointerType(destPointee); 2998 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2999 ImpCastExprToType(RHS, destType); // promote to void* 3000 return destType; 3001 } 3002 if (rhptee->isVoidType() 3003 && (LHSBPT || lhptee->isIncompleteOrObjectType())) { 3004 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3005 QualType destType = Context.getPointerType(destPointee); 3006 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3007 ImpCastExprToType(RHS, destType); // promote to void* 3008 return destType; 3009 } 3010 3011 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 3012 if (sameKind 3013 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3014 // Two identical pointer types are always compatible. 3015 return LHSTy; 3016 } 3017 3018 QualType compositeType = LHSTy; 3019 3020 // If either type is an Objective-C object type then check 3021 // compatibility according to Objective-C. 3022 if (Context.isObjCObjectPointerType(LHSTy) || 3023 Context.isObjCObjectPointerType(RHSTy)) { 3024 // If both operands are interfaces and either operand can be 3025 // assigned to the other, use that type as the composite 3026 // type. This allows 3027 // xxx ? (A*) a : (B*) b 3028 // where B is a subclass of A. 3029 // 3030 // Additionally, as for assignment, if either type is 'id' 3031 // allow silent coercion. Finally, if the types are 3032 // incompatible then make sure to use 'id' as the composite 3033 // type so the result is acceptable for sending messages to. 3034 3035 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3036 // It could return the composite type. 3037 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3038 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3039 if (LHSIface && RHSIface && 3040 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3041 compositeType = LHSTy; 3042 } else if (LHSIface && RHSIface && 3043 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3044 compositeType = RHSTy; 3045 } else if (Context.isObjCIdStructType(lhptee) || 3046 Context.isObjCIdStructType(rhptee)) { 3047 compositeType = Context.getObjCIdType(); 3048 } else if (LHSBPT || RHSBPT) { 3049 if (!sameKind 3050 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3051 rhptee.getUnqualifiedType())) 3052 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3053 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3054 return QualType(); 3055 } else { 3056 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3057 << LHSTy << RHSTy 3058 << LHS->getSourceRange() << RHS->getSourceRange(); 3059 QualType incompatTy = Context.getObjCIdType(); 3060 ImpCastExprToType(LHS, incompatTy); 3061 ImpCastExprToType(RHS, incompatTy); 3062 return incompatTy; 3063 } 3064 } else if (!sameKind 3065 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3066 rhptee.getUnqualifiedType())) { 3067 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3068 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3069 // In this situation, we assume void* type. No especially good 3070 // reason, but this is what gcc does, and we do have to pick 3071 // to get a consistent AST. 3072 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3073 ImpCastExprToType(LHS, incompatTy); 3074 ImpCastExprToType(RHS, incompatTy); 3075 return incompatTy; 3076 } 3077 // The pointer types are compatible. 3078 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3079 // differently qualified versions of compatible types, the result type is 3080 // a pointer to an appropriately qualified version of the *composite* 3081 // type. 3082 // FIXME: Need to calculate the composite type. 3083 // FIXME: Need to add qualifiers 3084 ImpCastExprToType(LHS, compositeType); 3085 ImpCastExprToType(RHS, compositeType); 3086 return compositeType; 3087 } 3088 3089 // GCC compatibility: soften pointer/integer mismatch. 3090 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3091 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3092 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3093 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3094 return RHSTy; 3095 } 3096 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3097 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3098 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3099 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3100 return LHSTy; 3101 } 3102 3103 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3104 // evaluates to "struct objc_object *" (and is handled above when comparing 3105 // id with statically typed objects). 3106 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3107 // GCC allows qualified id and any Objective-C type to devolve to 3108 // id. Currently localizing to here until clear this should be 3109 // part of ObjCQualifiedIdTypesAreCompatible. 3110 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3111 (LHSTy->isObjCQualifiedIdType() && 3112 Context.isObjCObjectPointerType(RHSTy)) || 3113 (RHSTy->isObjCQualifiedIdType() && 3114 Context.isObjCObjectPointerType(LHSTy))) { 3115 // FIXME: This is not the correct composite type. This only happens to 3116 // work because id can more or less be used anywhere, however this may 3117 // change the type of method sends. 3118 3119 // FIXME: gcc adds some type-checking of the arguments and emits 3120 // (confusing) incompatible comparison warnings in some 3121 // cases. Investigate. 3122 QualType compositeType = Context.getObjCIdType(); 3123 ImpCastExprToType(LHS, compositeType); 3124 ImpCastExprToType(RHS, compositeType); 3125 return compositeType; 3126 } 3127 } 3128 3129 // Otherwise, the operands are not compatible. 3130 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3131 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3132 return QualType(); 3133} 3134 3135/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3136/// in the case of a the GNU conditional expr extension. 3137Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3138 SourceLocation ColonLoc, 3139 ExprArg Cond, ExprArg LHS, 3140 ExprArg RHS) { 3141 Expr *CondExpr = (Expr *) Cond.get(); 3142 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3143 3144 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3145 // was the condition. 3146 bool isLHSNull = LHSExpr == 0; 3147 if (isLHSNull) 3148 LHSExpr = CondExpr; 3149 3150 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3151 RHSExpr, QuestionLoc); 3152 if (result.isNull()) 3153 return ExprError(); 3154 3155 Cond.release(); 3156 LHS.release(); 3157 RHS.release(); 3158 return Owned(new (Context) ConditionalOperator(CondExpr, 3159 isLHSNull ? 0 : LHSExpr, 3160 RHSExpr, result)); 3161} 3162 3163 3164// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3165// being closely modeled after the C99 spec:-). The odd characteristic of this 3166// routine is it effectively iqnores the qualifiers on the top level pointee. 3167// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3168// FIXME: add a couple examples in this comment. 3169Sema::AssignConvertType 3170Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3171 QualType lhptee, rhptee; 3172 3173 // get the "pointed to" type (ignoring qualifiers at the top level) 3174 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3175 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3176 3177 // make sure we operate on the canonical type 3178 lhptee = Context.getCanonicalType(lhptee); 3179 rhptee = Context.getCanonicalType(rhptee); 3180 3181 AssignConvertType ConvTy = Compatible; 3182 3183 // C99 6.5.16.1p1: This following citation is common to constraints 3184 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3185 // qualifiers of the type *pointed to* by the right; 3186 // FIXME: Handle ExtQualType 3187 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3188 ConvTy = CompatiblePointerDiscardsQualifiers; 3189 3190 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3191 // incomplete type and the other is a pointer to a qualified or unqualified 3192 // version of void... 3193 if (lhptee->isVoidType()) { 3194 if (rhptee->isIncompleteOrObjectType()) 3195 return ConvTy; 3196 3197 // As an extension, we allow cast to/from void* to function pointer. 3198 assert(rhptee->isFunctionType()); 3199 return FunctionVoidPointer; 3200 } 3201 3202 if (rhptee->isVoidType()) { 3203 if (lhptee->isIncompleteOrObjectType()) 3204 return ConvTy; 3205 3206 // As an extension, we allow cast to/from void* to function pointer. 3207 assert(lhptee->isFunctionType()); 3208 return FunctionVoidPointer; 3209 } 3210 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3211 // unqualified versions of compatible types, ... 3212 lhptee = lhptee.getUnqualifiedType(); 3213 rhptee = rhptee.getUnqualifiedType(); 3214 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3215 // Check if the pointee types are compatible ignoring the sign. 3216 // We explicitly check for char so that we catch "char" vs 3217 // "unsigned char" on systems where "char" is unsigned. 3218 if (lhptee->isCharType()) { 3219 lhptee = Context.UnsignedCharTy; 3220 } else if (lhptee->isSignedIntegerType()) { 3221 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3222 } 3223 if (rhptee->isCharType()) { 3224 rhptee = Context.UnsignedCharTy; 3225 } else if (rhptee->isSignedIntegerType()) { 3226 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3227 } 3228 if (lhptee == rhptee) { 3229 // Types are compatible ignoring the sign. Qualifier incompatibility 3230 // takes priority over sign incompatibility because the sign 3231 // warning can be disabled. 3232 if (ConvTy != Compatible) 3233 return ConvTy; 3234 return IncompatiblePointerSign; 3235 } 3236 // General pointer incompatibility takes priority over qualifiers. 3237 return IncompatiblePointer; 3238 } 3239 return ConvTy; 3240} 3241 3242/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3243/// block pointer types are compatible or whether a block and normal pointer 3244/// are compatible. It is more restrict than comparing two function pointer 3245// types. 3246Sema::AssignConvertType 3247Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3248 QualType rhsType) { 3249 QualType lhptee, rhptee; 3250 3251 // get the "pointed to" type (ignoring qualifiers at the top level) 3252 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3253 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3254 3255 // make sure we operate on the canonical type 3256 lhptee = Context.getCanonicalType(lhptee); 3257 rhptee = Context.getCanonicalType(rhptee); 3258 3259 AssignConvertType ConvTy = Compatible; 3260 3261 // For blocks we enforce that qualifiers are identical. 3262 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3263 ConvTy = CompatiblePointerDiscardsQualifiers; 3264 3265 if (!Context.typesAreCompatible(lhptee, rhptee)) 3266 return IncompatibleBlockPointer; 3267 return ConvTy; 3268} 3269 3270/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3271/// has code to accommodate several GCC extensions when type checking 3272/// pointers. Here are some objectionable examples that GCC considers warnings: 3273/// 3274/// int a, *pint; 3275/// short *pshort; 3276/// struct foo *pfoo; 3277/// 3278/// pint = pshort; // warning: assignment from incompatible pointer type 3279/// a = pint; // warning: assignment makes integer from pointer without a cast 3280/// pint = a; // warning: assignment makes pointer from integer without a cast 3281/// pint = pfoo; // warning: assignment from incompatible pointer type 3282/// 3283/// As a result, the code for dealing with pointers is more complex than the 3284/// C99 spec dictates. 3285/// 3286Sema::AssignConvertType 3287Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3288 // Get canonical types. We're not formatting these types, just comparing 3289 // them. 3290 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3291 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3292 3293 if (lhsType == rhsType) 3294 return Compatible; // Common case: fast path an exact match. 3295 3296 // If the left-hand side is a reference type, then we are in a 3297 // (rare!) case where we've allowed the use of references in C, 3298 // e.g., as a parameter type in a built-in function. In this case, 3299 // just make sure that the type referenced is compatible with the 3300 // right-hand side type. The caller is responsible for adjusting 3301 // lhsType so that the resulting expression does not have reference 3302 // type. 3303 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3304 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3305 return Compatible; 3306 return Incompatible; 3307 } 3308 3309 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3310 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3311 return Compatible; 3312 // Relax integer conversions like we do for pointers below. 3313 if (rhsType->isIntegerType()) 3314 return IntToPointer; 3315 if (lhsType->isIntegerType()) 3316 return PointerToInt; 3317 return IncompatibleObjCQualifiedId; 3318 } 3319 3320 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3321 // For ExtVector, allow vector splats; float -> <n x float> 3322 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3323 if (LV->getElementType() == rhsType) 3324 return Compatible; 3325 3326 // If we are allowing lax vector conversions, and LHS and RHS are both 3327 // vectors, the total size only needs to be the same. This is a bitcast; 3328 // no bits are changed but the result type is different. 3329 if (getLangOptions().LaxVectorConversions && 3330 lhsType->isVectorType() && rhsType->isVectorType()) { 3331 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3332 return IncompatibleVectors; 3333 } 3334 return Incompatible; 3335 } 3336 3337 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3338 return Compatible; 3339 3340 if (isa<PointerType>(lhsType)) { 3341 if (rhsType->isIntegerType()) 3342 return IntToPointer; 3343 3344 if (isa<PointerType>(rhsType)) 3345 return CheckPointerTypesForAssignment(lhsType, rhsType); 3346 3347 if (rhsType->getAsBlockPointerType()) { 3348 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3349 return Compatible; 3350 3351 // Treat block pointers as objects. 3352 if (getLangOptions().ObjC1 && 3353 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3354 return Compatible; 3355 } 3356 return Incompatible; 3357 } 3358 3359 if (isa<BlockPointerType>(lhsType)) { 3360 if (rhsType->isIntegerType()) 3361 return IntToBlockPointer; 3362 3363 // Treat block pointers as objects. 3364 if (getLangOptions().ObjC1 && 3365 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3366 return Compatible; 3367 3368 if (rhsType->isBlockPointerType()) 3369 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3370 3371 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3372 if (RHSPT->getPointeeType()->isVoidType()) 3373 return Compatible; 3374 } 3375 return Incompatible; 3376 } 3377 3378 if (isa<PointerType>(rhsType)) { 3379 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3380 if (lhsType == Context.BoolTy) 3381 return Compatible; 3382 3383 if (lhsType->isIntegerType()) 3384 return PointerToInt; 3385 3386 if (isa<PointerType>(lhsType)) 3387 return CheckPointerTypesForAssignment(lhsType, rhsType); 3388 3389 if (isa<BlockPointerType>(lhsType) && 3390 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3391 return Compatible; 3392 return Incompatible; 3393 } 3394 3395 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3396 if (Context.typesAreCompatible(lhsType, rhsType)) 3397 return Compatible; 3398 } 3399 return Incompatible; 3400} 3401 3402/// \brief Constructs a transparent union from an expression that is 3403/// used to initialize the transparent union. 3404static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3405 QualType UnionType, FieldDecl *Field) { 3406 // Build an initializer list that designates the appropriate member 3407 // of the transparent union. 3408 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3409 &E, 1, 3410 SourceLocation()); 3411 Initializer->setType(UnionType); 3412 Initializer->setInitializedFieldInUnion(Field); 3413 3414 // Build a compound literal constructing a value of the transparent 3415 // union type from this initializer list. 3416 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3417 false); 3418} 3419 3420Sema::AssignConvertType 3421Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3422 QualType FromType = rExpr->getType(); 3423 3424 // If the ArgType is a Union type, we want to handle a potential 3425 // transparent_union GCC extension. 3426 const RecordType *UT = ArgType->getAsUnionType(); 3427 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>(Context)) 3428 return Incompatible; 3429 3430 // The field to initialize within the transparent union. 3431 RecordDecl *UD = UT->getDecl(); 3432 FieldDecl *InitField = 0; 3433 // It's compatible if the expression matches any of the fields. 3434 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3435 itend = UD->field_end(Context); 3436 it != itend; ++it) { 3437 if (it->getType()->isPointerType()) { 3438 // If the transparent union contains a pointer type, we allow: 3439 // 1) void pointer 3440 // 2) null pointer constant 3441 if (FromType->isPointerType()) 3442 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3443 ImpCastExprToType(rExpr, it->getType()); 3444 InitField = *it; 3445 break; 3446 } 3447 3448 if (rExpr->isNullPointerConstant(Context)) { 3449 ImpCastExprToType(rExpr, it->getType()); 3450 InitField = *it; 3451 break; 3452 } 3453 } 3454 3455 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3456 == Compatible) { 3457 InitField = *it; 3458 break; 3459 } 3460 } 3461 3462 if (!InitField) 3463 return Incompatible; 3464 3465 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3466 return Compatible; 3467} 3468 3469Sema::AssignConvertType 3470Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3471 if (getLangOptions().CPlusPlus) { 3472 if (!lhsType->isRecordType()) { 3473 // C++ 5.17p3: If the left operand is not of class type, the 3474 // expression is implicitly converted (C++ 4) to the 3475 // cv-unqualified type of the left operand. 3476 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3477 "assigning")) 3478 return Incompatible; 3479 return Compatible; 3480 } 3481 3482 // FIXME: Currently, we fall through and treat C++ classes like C 3483 // structures. 3484 } 3485 3486 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3487 // a null pointer constant. 3488 if ((lhsType->isPointerType() || 3489 lhsType->isObjCQualifiedIdType() || 3490 lhsType->isBlockPointerType()) 3491 && rExpr->isNullPointerConstant(Context)) { 3492 ImpCastExprToType(rExpr, lhsType); 3493 return Compatible; 3494 } 3495 3496 // This check seems unnatural, however it is necessary to ensure the proper 3497 // conversion of functions/arrays. If the conversion were done for all 3498 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3499 // expressions that surpress this implicit conversion (&, sizeof). 3500 // 3501 // Suppress this for references: C++ 8.5.3p5. 3502 if (!lhsType->isReferenceType()) 3503 DefaultFunctionArrayConversion(rExpr); 3504 3505 Sema::AssignConvertType result = 3506 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3507 3508 // C99 6.5.16.1p2: The value of the right operand is converted to the 3509 // type of the assignment expression. 3510 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3511 // so that we can use references in built-in functions even in C. 3512 // The getNonReferenceType() call makes sure that the resulting expression 3513 // does not have reference type. 3514 if (result != Incompatible && rExpr->getType() != lhsType) 3515 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3516 return result; 3517} 3518 3519QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3520 Diag(Loc, diag::err_typecheck_invalid_operands) 3521 << lex->getType() << rex->getType() 3522 << lex->getSourceRange() << rex->getSourceRange(); 3523 return QualType(); 3524} 3525 3526inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3527 Expr *&rex) { 3528 // For conversion purposes, we ignore any qualifiers. 3529 // For example, "const float" and "float" are equivalent. 3530 QualType lhsType = 3531 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3532 QualType rhsType = 3533 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3534 3535 // If the vector types are identical, return. 3536 if (lhsType == rhsType) 3537 return lhsType; 3538 3539 // Handle the case of a vector & extvector type of the same size and element 3540 // type. It would be nice if we only had one vector type someday. 3541 if (getLangOptions().LaxVectorConversions) { 3542 // FIXME: Should we warn here? 3543 if (const VectorType *LV = lhsType->getAsVectorType()) { 3544 if (const VectorType *RV = rhsType->getAsVectorType()) 3545 if (LV->getElementType() == RV->getElementType() && 3546 LV->getNumElements() == RV->getNumElements()) { 3547 return lhsType->isExtVectorType() ? lhsType : rhsType; 3548 } 3549 } 3550 } 3551 3552 // If the lhs is an extended vector and the rhs is a scalar of the same type 3553 // or a literal, promote the rhs to the vector type. 3554 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3555 QualType eltType = V->getElementType(); 3556 3557 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3558 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3559 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3560 ImpCastExprToType(rex, lhsType); 3561 return lhsType; 3562 } 3563 } 3564 3565 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3566 // promote the lhs to the vector type. 3567 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3568 QualType eltType = V->getElementType(); 3569 3570 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3571 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3572 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3573 ImpCastExprToType(lex, rhsType); 3574 return rhsType; 3575 } 3576 } 3577 3578 // You cannot convert between vector values of different size. 3579 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3580 << lex->getType() << rex->getType() 3581 << lex->getSourceRange() << rex->getSourceRange(); 3582 return QualType(); 3583} 3584 3585inline QualType Sema::CheckMultiplyDivideOperands( 3586 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3587{ 3588 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3589 return CheckVectorOperands(Loc, lex, rex); 3590 3591 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3592 3593 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3594 return compType; 3595 return InvalidOperands(Loc, lex, rex); 3596} 3597 3598inline QualType Sema::CheckRemainderOperands( 3599 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3600{ 3601 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3602 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3603 return CheckVectorOperands(Loc, lex, rex); 3604 return InvalidOperands(Loc, lex, rex); 3605 } 3606 3607 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3608 3609 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3610 return compType; 3611 return InvalidOperands(Loc, lex, rex); 3612} 3613 3614inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3615 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3616{ 3617 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3618 QualType compType = CheckVectorOperands(Loc, lex, rex); 3619 if (CompLHSTy) *CompLHSTy = compType; 3620 return compType; 3621 } 3622 3623 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3624 3625 // handle the common case first (both operands are arithmetic). 3626 if (lex->getType()->isArithmeticType() && 3627 rex->getType()->isArithmeticType()) { 3628 if (CompLHSTy) *CompLHSTy = compType; 3629 return compType; 3630 } 3631 3632 // Put any potential pointer into PExp 3633 Expr* PExp = lex, *IExp = rex; 3634 if (IExp->getType()->isPointerType()) 3635 std::swap(PExp, IExp); 3636 3637 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3638 if (IExp->getType()->isIntegerType()) { 3639 QualType PointeeTy = PTy->getPointeeType(); 3640 // Check for arithmetic on pointers to incomplete types. 3641 if (PointeeTy->isVoidType()) { 3642 if (getLangOptions().CPlusPlus) { 3643 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3644 << lex->getSourceRange() << rex->getSourceRange(); 3645 return QualType(); 3646 } 3647 3648 // GNU extension: arithmetic on pointer to void 3649 Diag(Loc, diag::ext_gnu_void_ptr) 3650 << lex->getSourceRange() << rex->getSourceRange(); 3651 } else if (PointeeTy->isFunctionType()) { 3652 if (getLangOptions().CPlusPlus) { 3653 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3654 << lex->getType() << lex->getSourceRange(); 3655 return QualType(); 3656 } 3657 3658 // GNU extension: arithmetic on pointer to function 3659 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3660 << lex->getType() << lex->getSourceRange(); 3661 } else if (!PTy->isDependentType() && 3662 RequireCompleteType(Loc, PointeeTy, 3663 diag::err_typecheck_arithmetic_incomplete_type, 3664 PExp->getSourceRange(), SourceRange(), 3665 PExp->getType())) 3666 return QualType(); 3667 3668 // Diagnose bad cases where we step over interface counts. 3669 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3670 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3671 << PointeeTy << PExp->getSourceRange(); 3672 return QualType(); 3673 } 3674 3675 if (CompLHSTy) { 3676 QualType LHSTy = lex->getType(); 3677 if (LHSTy->isPromotableIntegerType()) 3678 LHSTy = Context.IntTy; 3679 else { 3680 QualType T = isPromotableBitField(lex, Context); 3681 if (!T.isNull()) 3682 LHSTy = T; 3683 } 3684 3685 *CompLHSTy = LHSTy; 3686 } 3687 return PExp->getType(); 3688 } 3689 } 3690 3691 return InvalidOperands(Loc, lex, rex); 3692} 3693 3694// C99 6.5.6 3695QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3696 SourceLocation Loc, QualType* CompLHSTy) { 3697 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3698 QualType compType = CheckVectorOperands(Loc, lex, rex); 3699 if (CompLHSTy) *CompLHSTy = compType; 3700 return compType; 3701 } 3702 3703 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3704 3705 // Enforce type constraints: C99 6.5.6p3. 3706 3707 // Handle the common case first (both operands are arithmetic). 3708 if (lex->getType()->isArithmeticType() 3709 && rex->getType()->isArithmeticType()) { 3710 if (CompLHSTy) *CompLHSTy = compType; 3711 return compType; 3712 } 3713 3714 // Either ptr - int or ptr - ptr. 3715 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3716 QualType lpointee = LHSPTy->getPointeeType(); 3717 3718 // The LHS must be an completely-defined object type. 3719 3720 bool ComplainAboutVoid = false; 3721 Expr *ComplainAboutFunc = 0; 3722 if (lpointee->isVoidType()) { 3723 if (getLangOptions().CPlusPlus) { 3724 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3725 << lex->getSourceRange() << rex->getSourceRange(); 3726 return QualType(); 3727 } 3728 3729 // GNU C extension: arithmetic on pointer to void 3730 ComplainAboutVoid = true; 3731 } else if (lpointee->isFunctionType()) { 3732 if (getLangOptions().CPlusPlus) { 3733 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3734 << lex->getType() << lex->getSourceRange(); 3735 return QualType(); 3736 } 3737 3738 // GNU C extension: arithmetic on pointer to function 3739 ComplainAboutFunc = lex; 3740 } else if (!lpointee->isDependentType() && 3741 RequireCompleteType(Loc, lpointee, 3742 diag::err_typecheck_sub_ptr_object, 3743 lex->getSourceRange(), 3744 SourceRange(), 3745 lex->getType())) 3746 return QualType(); 3747 3748 // Diagnose bad cases where we step over interface counts. 3749 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3750 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3751 << lpointee << lex->getSourceRange(); 3752 return QualType(); 3753 } 3754 3755 // The result type of a pointer-int computation is the pointer type. 3756 if (rex->getType()->isIntegerType()) { 3757 if (ComplainAboutVoid) 3758 Diag(Loc, diag::ext_gnu_void_ptr) 3759 << lex->getSourceRange() << rex->getSourceRange(); 3760 if (ComplainAboutFunc) 3761 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3762 << ComplainAboutFunc->getType() 3763 << ComplainAboutFunc->getSourceRange(); 3764 3765 if (CompLHSTy) *CompLHSTy = lex->getType(); 3766 return lex->getType(); 3767 } 3768 3769 // Handle pointer-pointer subtractions. 3770 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3771 QualType rpointee = RHSPTy->getPointeeType(); 3772 3773 // RHS must be a completely-type object type. 3774 // Handle the GNU void* extension. 3775 if (rpointee->isVoidType()) { 3776 if (getLangOptions().CPlusPlus) { 3777 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3778 << lex->getSourceRange() << rex->getSourceRange(); 3779 return QualType(); 3780 } 3781 3782 ComplainAboutVoid = true; 3783 } else if (rpointee->isFunctionType()) { 3784 if (getLangOptions().CPlusPlus) { 3785 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3786 << rex->getType() << rex->getSourceRange(); 3787 return QualType(); 3788 } 3789 3790 // GNU extension: arithmetic on pointer to function 3791 if (!ComplainAboutFunc) 3792 ComplainAboutFunc = rex; 3793 } else if (!rpointee->isDependentType() && 3794 RequireCompleteType(Loc, rpointee, 3795 diag::err_typecheck_sub_ptr_object, 3796 rex->getSourceRange(), 3797 SourceRange(), 3798 rex->getType())) 3799 return QualType(); 3800 3801 if (getLangOptions().CPlusPlus) { 3802 // Pointee types must be the same: C++ [expr.add] 3803 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3804 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3805 << lex->getType() << rex->getType() 3806 << lex->getSourceRange() << rex->getSourceRange(); 3807 return QualType(); 3808 } 3809 } else { 3810 // Pointee types must be compatible C99 6.5.6p3 3811 if (!Context.typesAreCompatible( 3812 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3813 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3814 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3815 << lex->getType() << rex->getType() 3816 << lex->getSourceRange() << rex->getSourceRange(); 3817 return QualType(); 3818 } 3819 } 3820 3821 if (ComplainAboutVoid) 3822 Diag(Loc, diag::ext_gnu_void_ptr) 3823 << lex->getSourceRange() << rex->getSourceRange(); 3824 if (ComplainAboutFunc) 3825 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3826 << ComplainAboutFunc->getType() 3827 << ComplainAboutFunc->getSourceRange(); 3828 3829 if (CompLHSTy) *CompLHSTy = lex->getType(); 3830 return Context.getPointerDiffType(); 3831 } 3832 } 3833 3834 return InvalidOperands(Loc, lex, rex); 3835} 3836 3837// C99 6.5.7 3838QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3839 bool isCompAssign) { 3840 // C99 6.5.7p2: Each of the operands shall have integer type. 3841 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3842 return InvalidOperands(Loc, lex, rex); 3843 3844 // Shifts don't perform usual arithmetic conversions, they just do integer 3845 // promotions on each operand. C99 6.5.7p3 3846 QualType LHSTy; 3847 if (lex->getType()->isPromotableIntegerType()) 3848 LHSTy = Context.IntTy; 3849 else { 3850 LHSTy = isPromotableBitField(lex, Context); 3851 if (LHSTy.isNull()) 3852 LHSTy = lex->getType(); 3853 } 3854 if (!isCompAssign) 3855 ImpCastExprToType(lex, LHSTy); 3856 3857 UsualUnaryConversions(rex); 3858 3859 // "The type of the result is that of the promoted left operand." 3860 return LHSTy; 3861} 3862 3863// C99 6.5.8, C++ [expr.rel] 3864QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3865 unsigned OpaqueOpc, bool isRelational) { 3866 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3867 3868 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3869 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3870 3871 // C99 6.5.8p3 / C99 6.5.9p4 3872 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3873 UsualArithmeticConversions(lex, rex); 3874 else { 3875 UsualUnaryConversions(lex); 3876 UsualUnaryConversions(rex); 3877 } 3878 QualType lType = lex->getType(); 3879 QualType rType = rex->getType(); 3880 3881 if (!lType->isFloatingType() 3882 && !(lType->isBlockPointerType() && isRelational)) { 3883 // For non-floating point types, check for self-comparisons of the form 3884 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3885 // often indicate logic errors in the program. 3886 // NOTE: Don't warn about comparisons of enum constants. These can arise 3887 // from macro expansions, and are usually quite deliberate. 3888 Expr *LHSStripped = lex->IgnoreParens(); 3889 Expr *RHSStripped = rex->IgnoreParens(); 3890 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3891 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3892 if (DRL->getDecl() == DRR->getDecl() && 3893 !isa<EnumConstantDecl>(DRL->getDecl())) 3894 Diag(Loc, diag::warn_selfcomparison); 3895 3896 if (isa<CastExpr>(LHSStripped)) 3897 LHSStripped = LHSStripped->IgnoreParenCasts(); 3898 if (isa<CastExpr>(RHSStripped)) 3899 RHSStripped = RHSStripped->IgnoreParenCasts(); 3900 3901 // Warn about comparisons against a string constant (unless the other 3902 // operand is null), the user probably wants strcmp. 3903 Expr *literalString = 0; 3904 Expr *literalStringStripped = 0; 3905 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3906 !RHSStripped->isNullPointerConstant(Context)) { 3907 literalString = lex; 3908 literalStringStripped = LHSStripped; 3909 } 3910 else if ((isa<StringLiteral>(RHSStripped) || 3911 isa<ObjCEncodeExpr>(RHSStripped)) && 3912 !LHSStripped->isNullPointerConstant(Context)) { 3913 literalString = rex; 3914 literalStringStripped = RHSStripped; 3915 } 3916 3917 if (literalString) { 3918 std::string resultComparison; 3919 switch (Opc) { 3920 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3921 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3922 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3923 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3924 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3925 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3926 default: assert(false && "Invalid comparison operator"); 3927 } 3928 Diag(Loc, diag::warn_stringcompare) 3929 << isa<ObjCEncodeExpr>(literalStringStripped) 3930 << literalString->getSourceRange() 3931 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3932 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3933 "strcmp(") 3934 << CodeModificationHint::CreateInsertion( 3935 PP.getLocForEndOfToken(rex->getLocEnd()), 3936 resultComparison); 3937 } 3938 } 3939 3940 // The result of comparisons is 'bool' in C++, 'int' in C. 3941 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3942 3943 if (isRelational) { 3944 if (lType->isRealType() && rType->isRealType()) 3945 return ResultTy; 3946 } else { 3947 // Check for comparisons of floating point operands using != and ==. 3948 if (lType->isFloatingType()) { 3949 assert(rType->isFloatingType()); 3950 CheckFloatComparison(Loc,lex,rex); 3951 } 3952 3953 if (lType->isArithmeticType() && rType->isArithmeticType()) 3954 return ResultTy; 3955 } 3956 3957 bool LHSIsNull = lex->isNullPointerConstant(Context); 3958 bool RHSIsNull = rex->isNullPointerConstant(Context); 3959 3960 // All of the following pointer related warnings are GCC extensions, except 3961 // when handling null pointer constants. One day, we can consider making them 3962 // errors (when -pedantic-errors is enabled). 3963 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3964 QualType LCanPointeeTy = 3965 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3966 QualType RCanPointeeTy = 3967 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3968 3969 // Simple check: if the pointee types are identical, we're done. 3970 if (LCanPointeeTy == RCanPointeeTy) 3971 return ResultTy; 3972 3973 if (getLangOptions().CPlusPlus) { 3974 // C++ [expr.rel]p2: 3975 // [...] Pointer conversions (4.10) and qualification 3976 // conversions (4.4) are performed on pointer operands (or on 3977 // a pointer operand and a null pointer constant) to bring 3978 // them to their composite pointer type. [...] 3979 // 3980 // C++ [expr.eq]p2 uses the same notion for (in)equality 3981 // comparisons of pointers. 3982 QualType T = FindCompositePointerType(lex, rex); 3983 if (T.isNull()) { 3984 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 3985 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3986 return QualType(); 3987 } 3988 3989 ImpCastExprToType(lex, T); 3990 ImpCastExprToType(rex, T); 3991 return ResultTy; 3992 } 3993 3994 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3995 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3996 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3997 RCanPointeeTy.getUnqualifiedType()) && 3998 !Context.areComparableObjCPointerTypes(lType, rType)) { 3999 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4000 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4001 } 4002 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4003 return ResultTy; 4004 } 4005 // C++ allows comparison of pointers with null pointer constants. 4006 if (getLangOptions().CPlusPlus) { 4007 if (lType->isPointerType() && RHSIsNull) { 4008 ImpCastExprToType(rex, lType); 4009 return ResultTy; 4010 } 4011 if (rType->isPointerType() && LHSIsNull) { 4012 ImpCastExprToType(lex, rType); 4013 return ResultTy; 4014 } 4015 // And comparison of nullptr_t with itself. 4016 if (lType->isNullPtrType() && rType->isNullPtrType()) 4017 return ResultTy; 4018 } 4019 // Handle block pointer types. 4020 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4021 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4022 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4023 4024 if (!LHSIsNull && !RHSIsNull && 4025 !Context.typesAreCompatible(lpointee, rpointee)) { 4026 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4027 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4028 } 4029 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4030 return ResultTy; 4031 } 4032 // Allow block pointers to be compared with null pointer constants. 4033 if (!isRelational 4034 && ((lType->isBlockPointerType() && rType->isPointerType()) 4035 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4036 if (!LHSIsNull && !RHSIsNull) { 4037 if (!((rType->isPointerType() && rType->getAsPointerType() 4038 ->getPointeeType()->isVoidType()) 4039 || (lType->isPointerType() && lType->getAsPointerType() 4040 ->getPointeeType()->isVoidType()))) 4041 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4042 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4043 } 4044 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4045 return ResultTy; 4046 } 4047 4048 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4049 if (lType->isPointerType() || rType->isPointerType()) { 4050 const PointerType *LPT = lType->getAsPointerType(); 4051 const PointerType *RPT = rType->getAsPointerType(); 4052 bool LPtrToVoid = LPT ? 4053 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4054 bool RPtrToVoid = RPT ? 4055 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4056 4057 if (!LPtrToVoid && !RPtrToVoid && 4058 !Context.typesAreCompatible(lType, rType)) { 4059 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4060 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4061 ImpCastExprToType(rex, lType); 4062 return ResultTy; 4063 } 4064 ImpCastExprToType(rex, lType); 4065 return ResultTy; 4066 } 4067 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4068 ImpCastExprToType(rex, lType); 4069 return ResultTy; 4070 } else { 4071 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4072 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4073 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4074 ImpCastExprToType(rex, lType); 4075 return ResultTy; 4076 } 4077 } 4078 } 4079 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4080 rType->isIntegerType()) { 4081 if (!RHSIsNull) 4082 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4083 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4084 ImpCastExprToType(rex, lType); // promote the integer to pointer 4085 return ResultTy; 4086 } 4087 if (lType->isIntegerType() && 4088 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 4089 if (!LHSIsNull) 4090 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4091 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4092 ImpCastExprToType(lex, rType); // promote the integer to pointer 4093 return ResultTy; 4094 } 4095 // Handle block pointers. 4096 if (!isRelational && RHSIsNull 4097 && lType->isBlockPointerType() && rType->isIntegerType()) { 4098 ImpCastExprToType(rex, lType); // promote the integer to pointer 4099 return ResultTy; 4100 } 4101 if (!isRelational && LHSIsNull 4102 && lType->isIntegerType() && rType->isBlockPointerType()) { 4103 ImpCastExprToType(lex, rType); // promote the integer to pointer 4104 return ResultTy; 4105 } 4106 return InvalidOperands(Loc, lex, rex); 4107} 4108 4109/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4110/// operates on extended vector types. Instead of producing an IntTy result, 4111/// like a scalar comparison, a vector comparison produces a vector of integer 4112/// types. 4113QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4114 SourceLocation Loc, 4115 bool isRelational) { 4116 // Check to make sure we're operating on vectors of the same type and width, 4117 // Allowing one side to be a scalar of element type. 4118 QualType vType = CheckVectorOperands(Loc, lex, rex); 4119 if (vType.isNull()) 4120 return vType; 4121 4122 QualType lType = lex->getType(); 4123 QualType rType = rex->getType(); 4124 4125 // For non-floating point types, check for self-comparisons of the form 4126 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4127 // often indicate logic errors in the program. 4128 if (!lType->isFloatingType()) { 4129 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4130 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4131 if (DRL->getDecl() == DRR->getDecl()) 4132 Diag(Loc, diag::warn_selfcomparison); 4133 } 4134 4135 // Check for comparisons of floating point operands using != and ==. 4136 if (!isRelational && lType->isFloatingType()) { 4137 assert (rType->isFloatingType()); 4138 CheckFloatComparison(Loc,lex,rex); 4139 } 4140 4141 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4142 // just reject all vector comparisons for now. 4143 if (1) { 4144 Diag(Loc, diag::err_typecheck_vector_comparison) 4145 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4146 return QualType(); 4147 } 4148 4149 // Return the type for the comparison, which is the same as vector type for 4150 // integer vectors, or an integer type of identical size and number of 4151 // elements for floating point vectors. 4152 if (lType->isIntegerType()) 4153 return lType; 4154 4155 const VectorType *VTy = lType->getAsVectorType(); 4156 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4157 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4158 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4159 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4160 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4161 4162 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4163 "Unhandled vector element size in vector compare"); 4164 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4165} 4166 4167inline QualType Sema::CheckBitwiseOperands( 4168 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4169{ 4170 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4171 return CheckVectorOperands(Loc, lex, rex); 4172 4173 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4174 4175 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4176 return compType; 4177 return InvalidOperands(Loc, lex, rex); 4178} 4179 4180inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4181 Expr *&lex, Expr *&rex, SourceLocation Loc) 4182{ 4183 UsualUnaryConversions(lex); 4184 UsualUnaryConversions(rex); 4185 4186 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4187 return Context.IntTy; 4188 return InvalidOperands(Loc, lex, rex); 4189} 4190 4191/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4192/// is a read-only property; return true if so. A readonly property expression 4193/// depends on various declarations and thus must be treated specially. 4194/// 4195static bool IsReadonlyProperty(Expr *E, Sema &S) 4196{ 4197 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4198 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4199 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4200 QualType BaseType = PropExpr->getBase()->getType(); 4201 if (const PointerType *PTy = BaseType->getAsPointerType()) 4202 if (const ObjCInterfaceType *IFTy = 4203 PTy->getPointeeType()->getAsObjCInterfaceType()) 4204 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4205 if (S.isPropertyReadonly(PDecl, IFace)) 4206 return true; 4207 } 4208 } 4209 return false; 4210} 4211 4212/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4213/// emit an error and return true. If so, return false. 4214static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4215 SourceLocation OrigLoc = Loc; 4216 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4217 &Loc); 4218 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4219 IsLV = Expr::MLV_ReadonlyProperty; 4220 if (IsLV == Expr::MLV_Valid) 4221 return false; 4222 4223 unsigned Diag = 0; 4224 bool NeedType = false; 4225 switch (IsLV) { // C99 6.5.16p2 4226 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4227 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4228 case Expr::MLV_ArrayType: 4229 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4230 NeedType = true; 4231 break; 4232 case Expr::MLV_NotObjectType: 4233 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4234 NeedType = true; 4235 break; 4236 case Expr::MLV_LValueCast: 4237 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4238 break; 4239 case Expr::MLV_InvalidExpression: 4240 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4241 break; 4242 case Expr::MLV_IncompleteType: 4243 case Expr::MLV_IncompleteVoidType: 4244 return S.RequireCompleteType(Loc, E->getType(), 4245 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4246 E->getSourceRange()); 4247 case Expr::MLV_DuplicateVectorComponents: 4248 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4249 break; 4250 case Expr::MLV_NotBlockQualified: 4251 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4252 break; 4253 case Expr::MLV_ReadonlyProperty: 4254 Diag = diag::error_readonly_property_assignment; 4255 break; 4256 case Expr::MLV_NoSetterProperty: 4257 Diag = diag::error_nosetter_property_assignment; 4258 break; 4259 } 4260 4261 SourceRange Assign; 4262 if (Loc != OrigLoc) 4263 Assign = SourceRange(OrigLoc, OrigLoc); 4264 if (NeedType) 4265 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4266 else 4267 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4268 return true; 4269} 4270 4271 4272 4273// C99 6.5.16.1 4274QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4275 SourceLocation Loc, 4276 QualType CompoundType) { 4277 // Verify that LHS is a modifiable lvalue, and emit error if not. 4278 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4279 return QualType(); 4280 4281 QualType LHSType = LHS->getType(); 4282 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4283 4284 AssignConvertType ConvTy; 4285 if (CompoundType.isNull()) { 4286 // Simple assignment "x = y". 4287 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4288 // Special case of NSObject attributes on c-style pointer types. 4289 if (ConvTy == IncompatiblePointer && 4290 ((Context.isObjCNSObjectType(LHSType) && 4291 Context.isObjCObjectPointerType(RHSType)) || 4292 (Context.isObjCNSObjectType(RHSType) && 4293 Context.isObjCObjectPointerType(LHSType)))) 4294 ConvTy = Compatible; 4295 4296 // If the RHS is a unary plus or minus, check to see if they = and + are 4297 // right next to each other. If so, the user may have typo'd "x =+ 4" 4298 // instead of "x += 4". 4299 Expr *RHSCheck = RHS; 4300 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4301 RHSCheck = ICE->getSubExpr(); 4302 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4303 if ((UO->getOpcode() == UnaryOperator::Plus || 4304 UO->getOpcode() == UnaryOperator::Minus) && 4305 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4306 // Only if the two operators are exactly adjacent. 4307 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4308 // And there is a space or other character before the subexpr of the 4309 // unary +/-. We don't want to warn on "x=-1". 4310 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4311 UO->getSubExpr()->getLocStart().isFileID()) { 4312 Diag(Loc, diag::warn_not_compound_assign) 4313 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4314 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4315 } 4316 } 4317 } else { 4318 // Compound assignment "x += y" 4319 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4320 } 4321 4322 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4323 RHS, "assigning")) 4324 return QualType(); 4325 4326 // C99 6.5.16p3: The type of an assignment expression is the type of the 4327 // left operand unless the left operand has qualified type, in which case 4328 // it is the unqualified version of the type of the left operand. 4329 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4330 // is converted to the type of the assignment expression (above). 4331 // C++ 5.17p1: the type of the assignment expression is that of its left 4332 // operand. 4333 return LHSType.getUnqualifiedType(); 4334} 4335 4336// C99 6.5.17 4337QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4338 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4339 DefaultFunctionArrayConversion(RHS); 4340 4341 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4342 // incomplete in C++). 4343 4344 return RHS->getType(); 4345} 4346 4347/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4348/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4349QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4350 bool isInc) { 4351 if (Op->isTypeDependent()) 4352 return Context.DependentTy; 4353 4354 QualType ResType = Op->getType(); 4355 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4356 4357 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4358 // Decrement of bool is not allowed. 4359 if (!isInc) { 4360 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4361 return QualType(); 4362 } 4363 // Increment of bool sets it to true, but is deprecated. 4364 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4365 } else if (ResType->isRealType()) { 4366 // OK! 4367 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4368 // C99 6.5.2.4p2, 6.5.6p2 4369 if (PT->getPointeeType()->isVoidType()) { 4370 if (getLangOptions().CPlusPlus) { 4371 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4372 << Op->getSourceRange(); 4373 return QualType(); 4374 } 4375 4376 // Pointer to void is a GNU extension in C. 4377 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4378 } else if (PT->getPointeeType()->isFunctionType()) { 4379 if (getLangOptions().CPlusPlus) { 4380 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4381 << Op->getType() << Op->getSourceRange(); 4382 return QualType(); 4383 } 4384 4385 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4386 << ResType << Op->getSourceRange(); 4387 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4388 diag::err_typecheck_arithmetic_incomplete_type, 4389 Op->getSourceRange(), SourceRange(), 4390 ResType)) 4391 return QualType(); 4392 } else if (ResType->isComplexType()) { 4393 // C99 does not support ++/-- on complex types, we allow as an extension. 4394 Diag(OpLoc, diag::ext_integer_increment_complex) 4395 << ResType << Op->getSourceRange(); 4396 } else { 4397 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4398 << ResType << Op->getSourceRange(); 4399 return QualType(); 4400 } 4401 // At this point, we know we have a real, complex or pointer type. 4402 // Now make sure the operand is a modifiable lvalue. 4403 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4404 return QualType(); 4405 return ResType; 4406} 4407 4408/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4409/// This routine allows us to typecheck complex/recursive expressions 4410/// where the declaration is needed for type checking. We only need to 4411/// handle cases when the expression references a function designator 4412/// or is an lvalue. Here are some examples: 4413/// - &(x) => x 4414/// - &*****f => f for f a function designator. 4415/// - &s.xx => s 4416/// - &s.zz[1].yy -> s, if zz is an array 4417/// - *(x + 1) -> x, if x is an array 4418/// - &"123"[2] -> 0 4419/// - & __real__ x -> x 4420static NamedDecl *getPrimaryDecl(Expr *E) { 4421 switch (E->getStmtClass()) { 4422 case Stmt::DeclRefExprClass: 4423 case Stmt::QualifiedDeclRefExprClass: 4424 return cast<DeclRefExpr>(E)->getDecl(); 4425 case Stmt::MemberExprClass: 4426 // If this is an arrow operator, the address is an offset from 4427 // the base's value, so the object the base refers to is 4428 // irrelevant. 4429 if (cast<MemberExpr>(E)->isArrow()) 4430 return 0; 4431 // Otherwise, the expression refers to a part of the base 4432 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4433 case Stmt::ArraySubscriptExprClass: { 4434 // FIXME: This code shouldn't be necessary! We should catch the implicit 4435 // promotion of register arrays earlier. 4436 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4437 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4438 if (ICE->getSubExpr()->getType()->isArrayType()) 4439 return getPrimaryDecl(ICE->getSubExpr()); 4440 } 4441 return 0; 4442 } 4443 case Stmt::UnaryOperatorClass: { 4444 UnaryOperator *UO = cast<UnaryOperator>(E); 4445 4446 switch(UO->getOpcode()) { 4447 case UnaryOperator::Real: 4448 case UnaryOperator::Imag: 4449 case UnaryOperator::Extension: 4450 return getPrimaryDecl(UO->getSubExpr()); 4451 default: 4452 return 0; 4453 } 4454 } 4455 case Stmt::ParenExprClass: 4456 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4457 case Stmt::ImplicitCastExprClass: 4458 // If the result of an implicit cast is an l-value, we care about 4459 // the sub-expression; otherwise, the result here doesn't matter. 4460 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4461 default: 4462 return 0; 4463 } 4464} 4465 4466/// CheckAddressOfOperand - The operand of & must be either a function 4467/// designator or an lvalue designating an object. If it is an lvalue, the 4468/// object cannot be declared with storage class register or be a bit field. 4469/// Note: The usual conversions are *not* applied to the operand of the & 4470/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4471/// In C++, the operand might be an overloaded function name, in which case 4472/// we allow the '&' but retain the overloaded-function type. 4473QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4474 // Make sure to ignore parentheses in subsequent checks 4475 op = op->IgnoreParens(); 4476 4477 if (op->isTypeDependent()) 4478 return Context.DependentTy; 4479 4480 if (getLangOptions().C99) { 4481 // Implement C99-only parts of addressof rules. 4482 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4483 if (uOp->getOpcode() == UnaryOperator::Deref) 4484 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4485 // (assuming the deref expression is valid). 4486 return uOp->getSubExpr()->getType(); 4487 } 4488 // Technically, there should be a check for array subscript 4489 // expressions here, but the result of one is always an lvalue anyway. 4490 } 4491 NamedDecl *dcl = getPrimaryDecl(op); 4492 Expr::isLvalueResult lval = op->isLvalue(Context); 4493 4494 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4495 // C99 6.5.3.2p1 4496 // The operand must be either an l-value or a function designator 4497 if (!op->getType()->isFunctionType()) { 4498 // FIXME: emit more specific diag... 4499 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4500 << op->getSourceRange(); 4501 return QualType(); 4502 } 4503 } else if (op->getBitField()) { // C99 6.5.3.2p1 4504 // The operand cannot be a bit-field 4505 Diag(OpLoc, diag::err_typecheck_address_of) 4506 << "bit-field" << op->getSourceRange(); 4507 return QualType(); 4508 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4509 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4510 // The operand cannot be an element of a vector 4511 Diag(OpLoc, diag::err_typecheck_address_of) 4512 << "vector element" << op->getSourceRange(); 4513 return QualType(); 4514 } else if (dcl) { // C99 6.5.3.2p1 4515 // We have an lvalue with a decl. Make sure the decl is not declared 4516 // with the register storage-class specifier. 4517 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4518 if (vd->getStorageClass() == VarDecl::Register) { 4519 Diag(OpLoc, diag::err_typecheck_address_of) 4520 << "register variable" << op->getSourceRange(); 4521 return QualType(); 4522 } 4523 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4524 return Context.OverloadTy; 4525 } else if (isa<FieldDecl>(dcl)) { 4526 // Okay: we can take the address of a field. 4527 // Could be a pointer to member, though, if there is an explicit 4528 // scope qualifier for the class. 4529 if (isa<QualifiedDeclRefExpr>(op)) { 4530 DeclContext *Ctx = dcl->getDeclContext(); 4531 if (Ctx && Ctx->isRecord()) 4532 return Context.getMemberPointerType(op->getType(), 4533 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4534 } 4535 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4536 // Okay: we can take the address of a function. 4537 // As above. 4538 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4539 return Context.getMemberPointerType(op->getType(), 4540 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4541 } else if (!isa<FunctionDecl>(dcl)) 4542 assert(0 && "Unknown/unexpected decl type"); 4543 } 4544 4545 if (lval == Expr::LV_IncompleteVoidType) { 4546 // Taking the address of a void variable is technically illegal, but we 4547 // allow it in cases which are otherwise valid. 4548 // Example: "extern void x; void* y = &x;". 4549 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4550 } 4551 4552 // If the operand has type "type", the result has type "pointer to type". 4553 return Context.getPointerType(op->getType()); 4554} 4555 4556QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4557 if (Op->isTypeDependent()) 4558 return Context.DependentTy; 4559 4560 UsualUnaryConversions(Op); 4561 QualType Ty = Op->getType(); 4562 4563 // Note that per both C89 and C99, this is always legal, even if ptype is an 4564 // incomplete type or void. It would be possible to warn about dereferencing 4565 // a void pointer, but it's completely well-defined, and such a warning is 4566 // unlikely to catch any mistakes. 4567 if (const PointerType *PT = Ty->getAsPointerType()) 4568 return PT->getPointeeType(); 4569 4570 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4571 << Ty << Op->getSourceRange(); 4572 return QualType(); 4573} 4574 4575static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4576 tok::TokenKind Kind) { 4577 BinaryOperator::Opcode Opc; 4578 switch (Kind) { 4579 default: assert(0 && "Unknown binop!"); 4580 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4581 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4582 case tok::star: Opc = BinaryOperator::Mul; break; 4583 case tok::slash: Opc = BinaryOperator::Div; break; 4584 case tok::percent: Opc = BinaryOperator::Rem; break; 4585 case tok::plus: Opc = BinaryOperator::Add; break; 4586 case tok::minus: Opc = BinaryOperator::Sub; break; 4587 case tok::lessless: Opc = BinaryOperator::Shl; break; 4588 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4589 case tok::lessequal: Opc = BinaryOperator::LE; break; 4590 case tok::less: Opc = BinaryOperator::LT; break; 4591 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4592 case tok::greater: Opc = BinaryOperator::GT; break; 4593 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4594 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4595 case tok::amp: Opc = BinaryOperator::And; break; 4596 case tok::caret: Opc = BinaryOperator::Xor; break; 4597 case tok::pipe: Opc = BinaryOperator::Or; break; 4598 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4599 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4600 case tok::equal: Opc = BinaryOperator::Assign; break; 4601 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4602 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4603 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4604 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4605 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4606 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4607 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4608 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4609 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4610 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4611 case tok::comma: Opc = BinaryOperator::Comma; break; 4612 } 4613 return Opc; 4614} 4615 4616static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4617 tok::TokenKind Kind) { 4618 UnaryOperator::Opcode Opc; 4619 switch (Kind) { 4620 default: assert(0 && "Unknown unary op!"); 4621 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4622 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4623 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4624 case tok::star: Opc = UnaryOperator::Deref; break; 4625 case tok::plus: Opc = UnaryOperator::Plus; break; 4626 case tok::minus: Opc = UnaryOperator::Minus; break; 4627 case tok::tilde: Opc = UnaryOperator::Not; break; 4628 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4629 case tok::kw___real: Opc = UnaryOperator::Real; break; 4630 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4631 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4632 } 4633 return Opc; 4634} 4635 4636/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4637/// operator @p Opc at location @c TokLoc. This routine only supports 4638/// built-in operations; ActOnBinOp handles overloaded operators. 4639Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4640 unsigned Op, 4641 Expr *lhs, Expr *rhs) { 4642 QualType ResultTy; // Result type of the binary operator. 4643 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4644 // The following two variables are used for compound assignment operators 4645 QualType CompLHSTy; // Type of LHS after promotions for computation 4646 QualType CompResultTy; // Type of computation result 4647 4648 switch (Opc) { 4649 case BinaryOperator::Assign: 4650 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4651 break; 4652 case BinaryOperator::PtrMemD: 4653 case BinaryOperator::PtrMemI: 4654 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4655 Opc == BinaryOperator::PtrMemI); 4656 break; 4657 case BinaryOperator::Mul: 4658 case BinaryOperator::Div: 4659 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4660 break; 4661 case BinaryOperator::Rem: 4662 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4663 break; 4664 case BinaryOperator::Add: 4665 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4666 break; 4667 case BinaryOperator::Sub: 4668 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4669 break; 4670 case BinaryOperator::Shl: 4671 case BinaryOperator::Shr: 4672 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4673 break; 4674 case BinaryOperator::LE: 4675 case BinaryOperator::LT: 4676 case BinaryOperator::GE: 4677 case BinaryOperator::GT: 4678 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4679 break; 4680 case BinaryOperator::EQ: 4681 case BinaryOperator::NE: 4682 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4683 break; 4684 case BinaryOperator::And: 4685 case BinaryOperator::Xor: 4686 case BinaryOperator::Or: 4687 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4688 break; 4689 case BinaryOperator::LAnd: 4690 case BinaryOperator::LOr: 4691 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4692 break; 4693 case BinaryOperator::MulAssign: 4694 case BinaryOperator::DivAssign: 4695 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4696 CompLHSTy = CompResultTy; 4697 if (!CompResultTy.isNull()) 4698 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4699 break; 4700 case BinaryOperator::RemAssign: 4701 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4702 CompLHSTy = CompResultTy; 4703 if (!CompResultTy.isNull()) 4704 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4705 break; 4706 case BinaryOperator::AddAssign: 4707 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4708 if (!CompResultTy.isNull()) 4709 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4710 break; 4711 case BinaryOperator::SubAssign: 4712 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4713 if (!CompResultTy.isNull()) 4714 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4715 break; 4716 case BinaryOperator::ShlAssign: 4717 case BinaryOperator::ShrAssign: 4718 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4719 CompLHSTy = CompResultTy; 4720 if (!CompResultTy.isNull()) 4721 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4722 break; 4723 case BinaryOperator::AndAssign: 4724 case BinaryOperator::XorAssign: 4725 case BinaryOperator::OrAssign: 4726 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4727 CompLHSTy = CompResultTy; 4728 if (!CompResultTy.isNull()) 4729 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4730 break; 4731 case BinaryOperator::Comma: 4732 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4733 break; 4734 } 4735 if (ResultTy.isNull()) 4736 return ExprError(); 4737 if (CompResultTy.isNull()) 4738 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4739 else 4740 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4741 CompLHSTy, CompResultTy, 4742 OpLoc)); 4743} 4744 4745// Binary Operators. 'Tok' is the token for the operator. 4746Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4747 tok::TokenKind Kind, 4748 ExprArg LHS, ExprArg RHS) { 4749 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4750 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4751 4752 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4753 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4754 4755 if (getLangOptions().CPlusPlus && 4756 (lhs->getType()->isOverloadableType() || 4757 rhs->getType()->isOverloadableType())) { 4758 // Find all of the overloaded operators visible from this 4759 // point. We perform both an operator-name lookup from the local 4760 // scope and an argument-dependent lookup based on the types of 4761 // the arguments. 4762 FunctionSet Functions; 4763 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4764 if (OverOp != OO_None) { 4765 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4766 Functions); 4767 Expr *Args[2] = { lhs, rhs }; 4768 DeclarationName OpName 4769 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4770 ArgumentDependentLookup(OpName, Args, 2, Functions); 4771 } 4772 4773 // Build the (potentially-overloaded, potentially-dependent) 4774 // binary operation. 4775 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4776 } 4777 4778 // Build a built-in binary operation. 4779 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4780} 4781 4782Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4783 unsigned OpcIn, 4784 ExprArg InputArg) { 4785 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4786 4787 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4788 Expr *Input = (Expr *)InputArg.get(); 4789 QualType resultType; 4790 switch (Opc) { 4791 case UnaryOperator::PostInc: 4792 case UnaryOperator::PostDec: 4793 case UnaryOperator::OffsetOf: 4794 assert(false && "Invalid unary operator"); 4795 break; 4796 4797 case UnaryOperator::PreInc: 4798 case UnaryOperator::PreDec: 4799 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4800 Opc == UnaryOperator::PreInc); 4801 break; 4802 case UnaryOperator::AddrOf: 4803 resultType = CheckAddressOfOperand(Input, OpLoc); 4804 break; 4805 case UnaryOperator::Deref: 4806 DefaultFunctionArrayConversion(Input); 4807 resultType = CheckIndirectionOperand(Input, OpLoc); 4808 break; 4809 case UnaryOperator::Plus: 4810 case UnaryOperator::Minus: 4811 UsualUnaryConversions(Input); 4812 resultType = Input->getType(); 4813 if (resultType->isDependentType()) 4814 break; 4815 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4816 break; 4817 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4818 resultType->isEnumeralType()) 4819 break; 4820 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4821 Opc == UnaryOperator::Plus && 4822 resultType->isPointerType()) 4823 break; 4824 4825 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4826 << resultType << Input->getSourceRange()); 4827 case UnaryOperator::Not: // bitwise complement 4828 UsualUnaryConversions(Input); 4829 resultType = Input->getType(); 4830 if (resultType->isDependentType()) 4831 break; 4832 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4833 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4834 // C99 does not support '~' for complex conjugation. 4835 Diag(OpLoc, diag::ext_integer_complement_complex) 4836 << resultType << Input->getSourceRange(); 4837 else if (!resultType->isIntegerType()) 4838 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4839 << resultType << Input->getSourceRange()); 4840 break; 4841 case UnaryOperator::LNot: // logical negation 4842 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4843 DefaultFunctionArrayConversion(Input); 4844 resultType = Input->getType(); 4845 if (resultType->isDependentType()) 4846 break; 4847 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4848 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4849 << resultType << Input->getSourceRange()); 4850 // LNot always has type int. C99 6.5.3.3p5. 4851 // In C++, it's bool. C++ 5.3.1p8 4852 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4853 break; 4854 case UnaryOperator::Real: 4855 case UnaryOperator::Imag: 4856 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4857 break; 4858 case UnaryOperator::Extension: 4859 resultType = Input->getType(); 4860 break; 4861 } 4862 if (resultType.isNull()) 4863 return ExprError(); 4864 4865 InputArg.release(); 4866 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4867} 4868 4869// Unary Operators. 'Tok' is the token for the operator. 4870Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4871 tok::TokenKind Op, ExprArg input) { 4872 Expr *Input = (Expr*)input.get(); 4873 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4874 4875 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4876 // Find all of the overloaded operators visible from this 4877 // point. We perform both an operator-name lookup from the local 4878 // scope and an argument-dependent lookup based on the types of 4879 // the arguments. 4880 FunctionSet Functions; 4881 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4882 if (OverOp != OO_None) { 4883 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4884 Functions); 4885 DeclarationName OpName 4886 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4887 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4888 } 4889 4890 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4891 } 4892 4893 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4894} 4895 4896/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4897Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4898 SourceLocation LabLoc, 4899 IdentifierInfo *LabelII) { 4900 // Look up the record for this label identifier. 4901 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4902 4903 // If we haven't seen this label yet, create a forward reference. It 4904 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4905 if (LabelDecl == 0) 4906 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4907 4908 // Create the AST node. The address of a label always has type 'void*'. 4909 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4910 Context.getPointerType(Context.VoidTy))); 4911} 4912 4913Sema::OwningExprResult 4914Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4915 SourceLocation RPLoc) { // "({..})" 4916 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4917 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4918 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4919 4920 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4921 if (isFileScope) 4922 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4923 4924 // FIXME: there are a variety of strange constraints to enforce here, for 4925 // example, it is not possible to goto into a stmt expression apparently. 4926 // More semantic analysis is needed. 4927 4928 // If there are sub stmts in the compound stmt, take the type of the last one 4929 // as the type of the stmtexpr. 4930 QualType Ty = Context.VoidTy; 4931 4932 if (!Compound->body_empty()) { 4933 Stmt *LastStmt = Compound->body_back(); 4934 // If LastStmt is a label, skip down through into the body. 4935 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4936 LastStmt = Label->getSubStmt(); 4937 4938 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4939 Ty = LastExpr->getType(); 4940 } 4941 4942 // FIXME: Check that expression type is complete/non-abstract; statement 4943 // expressions are not lvalues. 4944 4945 substmt.release(); 4946 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4947} 4948 4949Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4950 SourceLocation BuiltinLoc, 4951 SourceLocation TypeLoc, 4952 TypeTy *argty, 4953 OffsetOfComponent *CompPtr, 4954 unsigned NumComponents, 4955 SourceLocation RPLoc) { 4956 // FIXME: This function leaks all expressions in the offset components on 4957 // error. 4958 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4959 assert(!ArgTy.isNull() && "Missing type argument!"); 4960 4961 bool Dependent = ArgTy->isDependentType(); 4962 4963 // We must have at least one component that refers to the type, and the first 4964 // one is known to be a field designator. Verify that the ArgTy represents 4965 // a struct/union/class. 4966 if (!Dependent && !ArgTy->isRecordType()) 4967 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4968 4969 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4970 // with an incomplete type would be illegal. 4971 4972 // Otherwise, create a null pointer as the base, and iteratively process 4973 // the offsetof designators. 4974 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4975 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4976 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4977 ArgTy, SourceLocation()); 4978 4979 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4980 // GCC extension, diagnose them. 4981 // FIXME: This diagnostic isn't actually visible because the location is in 4982 // a system header! 4983 if (NumComponents != 1) 4984 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4985 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4986 4987 if (!Dependent) { 4988 bool DidWarnAboutNonPOD = false; 4989 4990 // FIXME: Dependent case loses a lot of information here. And probably 4991 // leaks like a sieve. 4992 for (unsigned i = 0; i != NumComponents; ++i) { 4993 const OffsetOfComponent &OC = CompPtr[i]; 4994 if (OC.isBrackets) { 4995 // Offset of an array sub-field. TODO: Should we allow vector elements? 4996 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4997 if (!AT) { 4998 Res->Destroy(Context); 4999 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5000 << Res->getType()); 5001 } 5002 5003 // FIXME: C++: Verify that operator[] isn't overloaded. 5004 5005 // Promote the array so it looks more like a normal array subscript 5006 // expression. 5007 DefaultFunctionArrayConversion(Res); 5008 5009 // C99 6.5.2.1p1 5010 Expr *Idx = static_cast<Expr*>(OC.U.E); 5011 // FIXME: Leaks Res 5012 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5013 return ExprError(Diag(Idx->getLocStart(), 5014 diag::err_typecheck_subscript_not_integer) 5015 << Idx->getSourceRange()); 5016 5017 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5018 OC.LocEnd); 5019 continue; 5020 } 5021 5022 const RecordType *RC = Res->getType()->getAsRecordType(); 5023 if (!RC) { 5024 Res->Destroy(Context); 5025 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5026 << Res->getType()); 5027 } 5028 5029 // Get the decl corresponding to this. 5030 RecordDecl *RD = RC->getDecl(); 5031 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5032 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5033 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5034 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5035 << Res->getType()); 5036 DidWarnAboutNonPOD = true; 5037 } 5038 } 5039 5040 FieldDecl *MemberDecl 5041 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5042 LookupMemberName) 5043 .getAsDecl()); 5044 // FIXME: Leaks Res 5045 if (!MemberDecl) 5046 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5047 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5048 5049 // FIXME: C++: Verify that MemberDecl isn't a static field. 5050 // FIXME: Verify that MemberDecl isn't a bitfield. 5051 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5052 Res = BuildAnonymousStructUnionMemberReference( 5053 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5054 } else { 5055 // MemberDecl->getType() doesn't get the right qualifiers, but it 5056 // doesn't matter here. 5057 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5058 MemberDecl->getType().getNonReferenceType()); 5059 } 5060 } 5061 } 5062 5063 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5064 Context.getSizeType(), BuiltinLoc)); 5065} 5066 5067 5068Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5069 TypeTy *arg1,TypeTy *arg2, 5070 SourceLocation RPLoc) { 5071 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5072 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5073 5074 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5075 5076 if (getLangOptions().CPlusPlus) { 5077 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5078 << SourceRange(BuiltinLoc, RPLoc); 5079 return ExprError(); 5080 } 5081 5082 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5083 argT1, argT2, RPLoc)); 5084} 5085 5086Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5087 ExprArg cond, 5088 ExprArg expr1, ExprArg expr2, 5089 SourceLocation RPLoc) { 5090 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5091 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5092 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5093 5094 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5095 5096 QualType resType; 5097 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5098 resType = Context.DependentTy; 5099 } else { 5100 // The conditional expression is required to be a constant expression. 5101 llvm::APSInt condEval(32); 5102 SourceLocation ExpLoc; 5103 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5104 return ExprError(Diag(ExpLoc, 5105 diag::err_typecheck_choose_expr_requires_constant) 5106 << CondExpr->getSourceRange()); 5107 5108 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5109 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5110 } 5111 5112 cond.release(); expr1.release(); expr2.release(); 5113 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5114 resType, RPLoc)); 5115} 5116 5117//===----------------------------------------------------------------------===// 5118// Clang Extensions. 5119//===----------------------------------------------------------------------===// 5120 5121/// ActOnBlockStart - This callback is invoked when a block literal is started. 5122void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5123 // Analyze block parameters. 5124 BlockSemaInfo *BSI = new BlockSemaInfo(); 5125 5126 // Add BSI to CurBlock. 5127 BSI->PrevBlockInfo = CurBlock; 5128 CurBlock = BSI; 5129 5130 BSI->ReturnType = QualType(); 5131 BSI->TheScope = BlockScope; 5132 BSI->hasBlockDeclRefExprs = false; 5133 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5134 CurFunctionNeedsScopeChecking = false; 5135 5136 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5137 PushDeclContext(BlockScope, BSI->TheDecl); 5138} 5139 5140void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5141 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5142 5143 if (ParamInfo.getNumTypeObjects() == 0 5144 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5145 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5146 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5147 5148 if (T->isArrayType()) { 5149 Diag(ParamInfo.getSourceRange().getBegin(), 5150 diag::err_block_returns_array); 5151 return; 5152 } 5153 5154 // The parameter list is optional, if there was none, assume (). 5155 if (!T->isFunctionType()) 5156 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5157 5158 CurBlock->hasPrototype = true; 5159 CurBlock->isVariadic = false; 5160 // Check for a valid sentinel attribute on this block. 5161 if (CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5162 Diag(ParamInfo.getAttributes()->getLoc(), 5163 diag::warn_attribute_sentinel_not_variadic) << 1; 5164 // FIXME: remove the attribute. 5165 } 5166 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5167 5168 // Do not allow returning a objc interface by-value. 5169 if (RetTy->isObjCInterfaceType()) { 5170 Diag(ParamInfo.getSourceRange().getBegin(), 5171 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5172 return; 5173 } 5174 return; 5175 } 5176 5177 // Analyze arguments to block. 5178 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5179 "Not a function declarator!"); 5180 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5181 5182 CurBlock->hasPrototype = FTI.hasPrototype; 5183 CurBlock->isVariadic = true; 5184 5185 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5186 // no arguments, not a function that takes a single void argument. 5187 if (FTI.hasPrototype && 5188 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5189 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5190 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5191 // empty arg list, don't push any params. 5192 CurBlock->isVariadic = false; 5193 } else if (FTI.hasPrototype) { 5194 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5195 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5196 CurBlock->isVariadic = FTI.isVariadic; 5197 } 5198 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5199 CurBlock->Params.size()); 5200 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5201 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5202 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5203 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5204 // If this has an identifier, add it to the scope stack. 5205 if ((*AI)->getIdentifier()) 5206 PushOnScopeChains(*AI, CurBlock->TheScope); 5207 5208 // Check for a valid sentinel attribute on this block. 5209 if (!CurBlock->isVariadic && 5210 CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5211 Diag(ParamInfo.getAttributes()->getLoc(), 5212 diag::warn_attribute_sentinel_not_variadic) << 1; 5213 // FIXME: remove the attribute. 5214 } 5215 5216 // Analyze the return type. 5217 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5218 QualType RetTy = T->getAsFunctionType()->getResultType(); 5219 5220 // Do not allow returning a objc interface by-value. 5221 if (RetTy->isObjCInterfaceType()) { 5222 Diag(ParamInfo.getSourceRange().getBegin(), 5223 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5224 } else if (!RetTy->isDependentType()) 5225 CurBlock->ReturnType = RetTy; 5226} 5227 5228/// ActOnBlockError - If there is an error parsing a block, this callback 5229/// is invoked to pop the information about the block from the action impl. 5230void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5231 // Ensure that CurBlock is deleted. 5232 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5233 5234 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5235 5236 // Pop off CurBlock, handle nested blocks. 5237 PopDeclContext(); 5238 CurBlock = CurBlock->PrevBlockInfo; 5239 // FIXME: Delete the ParmVarDecl objects as well??? 5240} 5241 5242/// ActOnBlockStmtExpr - This is called when the body of a block statement 5243/// literal was successfully completed. ^(int x){...} 5244Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5245 StmtArg body, Scope *CurScope) { 5246 // If blocks are disabled, emit an error. 5247 if (!LangOpts.Blocks) 5248 Diag(CaretLoc, diag::err_blocks_disable); 5249 5250 // Ensure that CurBlock is deleted. 5251 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5252 5253 PopDeclContext(); 5254 5255 // Pop off CurBlock, handle nested blocks. 5256 CurBlock = CurBlock->PrevBlockInfo; 5257 5258 QualType RetTy = Context.VoidTy; 5259 if (!BSI->ReturnType.isNull()) 5260 RetTy = BSI->ReturnType; 5261 5262 llvm::SmallVector<QualType, 8> ArgTypes; 5263 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5264 ArgTypes.push_back(BSI->Params[i]->getType()); 5265 5266 QualType BlockTy; 5267 if (!BSI->hasPrototype) 5268 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5269 else 5270 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5271 BSI->isVariadic, 0); 5272 5273 // FIXME: Check that return/parameter types are complete/non-abstract 5274 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5275 BlockTy = Context.getBlockPointerType(BlockTy); 5276 5277 // If needed, diagnose invalid gotos and switches in the block. 5278 if (CurFunctionNeedsScopeChecking) 5279 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5280 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5281 5282 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5283 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5284 BSI->hasBlockDeclRefExprs)); 5285} 5286 5287Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5288 ExprArg expr, TypeTy *type, 5289 SourceLocation RPLoc) { 5290 QualType T = QualType::getFromOpaquePtr(type); 5291 Expr *E = static_cast<Expr*>(expr.get()); 5292 Expr *OrigExpr = E; 5293 5294 InitBuiltinVaListType(); 5295 5296 // Get the va_list type 5297 QualType VaListType = Context.getBuiltinVaListType(); 5298 if (VaListType->isArrayType()) { 5299 // Deal with implicit array decay; for example, on x86-64, 5300 // va_list is an array, but it's supposed to decay to 5301 // a pointer for va_arg. 5302 VaListType = Context.getArrayDecayedType(VaListType); 5303 // Make sure the input expression also decays appropriately. 5304 UsualUnaryConversions(E); 5305 } else { 5306 // Otherwise, the va_list argument must be an l-value because 5307 // it is modified by va_arg. 5308 if (!E->isTypeDependent() && 5309 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5310 return ExprError(); 5311 } 5312 5313 if (!E->isTypeDependent() && 5314 !Context.hasSameType(VaListType, E->getType())) { 5315 return ExprError(Diag(E->getLocStart(), 5316 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5317 << OrigExpr->getType() << E->getSourceRange()); 5318 } 5319 5320 // FIXME: Check that type is complete/non-abstract 5321 // FIXME: Warn if a non-POD type is passed in. 5322 5323 expr.release(); 5324 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5325 RPLoc)); 5326} 5327 5328Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5329 // The type of __null will be int or long, depending on the size of 5330 // pointers on the target. 5331 QualType Ty; 5332 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5333 Ty = Context.IntTy; 5334 else 5335 Ty = Context.LongTy; 5336 5337 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5338} 5339 5340bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5341 SourceLocation Loc, 5342 QualType DstType, QualType SrcType, 5343 Expr *SrcExpr, const char *Flavor) { 5344 // Decode the result (notice that AST's are still created for extensions). 5345 bool isInvalid = false; 5346 unsigned DiagKind; 5347 switch (ConvTy) { 5348 default: assert(0 && "Unknown conversion type"); 5349 case Compatible: return false; 5350 case PointerToInt: 5351 DiagKind = diag::ext_typecheck_convert_pointer_int; 5352 break; 5353 case IntToPointer: 5354 DiagKind = diag::ext_typecheck_convert_int_pointer; 5355 break; 5356 case IncompatiblePointer: 5357 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5358 break; 5359 case IncompatiblePointerSign: 5360 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5361 break; 5362 case FunctionVoidPointer: 5363 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5364 break; 5365 case CompatiblePointerDiscardsQualifiers: 5366 // If the qualifiers lost were because we were applying the 5367 // (deprecated) C++ conversion from a string literal to a char* 5368 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5369 // Ideally, this check would be performed in 5370 // CheckPointerTypesForAssignment. However, that would require a 5371 // bit of refactoring (so that the second argument is an 5372 // expression, rather than a type), which should be done as part 5373 // of a larger effort to fix CheckPointerTypesForAssignment for 5374 // C++ semantics. 5375 if (getLangOptions().CPlusPlus && 5376 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5377 return false; 5378 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5379 break; 5380 case IntToBlockPointer: 5381 DiagKind = diag::err_int_to_block_pointer; 5382 break; 5383 case IncompatibleBlockPointer: 5384 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5385 break; 5386 case IncompatibleObjCQualifiedId: 5387 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5388 // it can give a more specific diagnostic. 5389 DiagKind = diag::warn_incompatible_qualified_id; 5390 break; 5391 case IncompatibleVectors: 5392 DiagKind = diag::warn_incompatible_vectors; 5393 break; 5394 case Incompatible: 5395 DiagKind = diag::err_typecheck_convert_incompatible; 5396 isInvalid = true; 5397 break; 5398 } 5399 5400 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5401 << SrcExpr->getSourceRange(); 5402 return isInvalid; 5403} 5404 5405bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5406 llvm::APSInt ICEResult; 5407 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5408 if (Result) 5409 *Result = ICEResult; 5410 return false; 5411 } 5412 5413 Expr::EvalResult EvalResult; 5414 5415 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5416 EvalResult.HasSideEffects) { 5417 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5418 5419 if (EvalResult.Diag) { 5420 // We only show the note if it's not the usual "invalid subexpression" 5421 // or if it's actually in a subexpression. 5422 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5423 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5424 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5425 } 5426 5427 return true; 5428 } 5429 5430 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5431 E->getSourceRange(); 5432 5433 if (EvalResult.Diag && 5434 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5435 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5436 5437 if (Result) 5438 *Result = EvalResult.Val.getInt(); 5439 return false; 5440} 5441 5442Sema::ExpressionEvaluationContext 5443Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5444 // Introduce a new set of potentially referenced declarations to the stack. 5445 if (NewContext == PotentiallyPotentiallyEvaluated) 5446 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5447 5448 std::swap(ExprEvalContext, NewContext); 5449 return NewContext; 5450} 5451 5452void 5453Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5454 ExpressionEvaluationContext NewContext) { 5455 ExprEvalContext = NewContext; 5456 5457 if (OldContext == PotentiallyPotentiallyEvaluated) { 5458 // Mark any remaining declarations in the current position of the stack 5459 // as "referenced". If they were not meant to be referenced, semantic 5460 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5461 PotentiallyReferencedDecls RemainingDecls; 5462 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5463 PotentiallyReferencedDeclStack.pop_back(); 5464 5465 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5466 IEnd = RemainingDecls.end(); 5467 I != IEnd; ++I) 5468 MarkDeclarationReferenced(I->first, I->second); 5469 } 5470} 5471 5472/// \brief Note that the given declaration was referenced in the source code. 5473/// 5474/// This routine should be invoke whenever a given declaration is referenced 5475/// in the source code, and where that reference occurred. If this declaration 5476/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5477/// C99 6.9p3), then the declaration will be marked as used. 5478/// 5479/// \param Loc the location where the declaration was referenced. 5480/// 5481/// \param D the declaration that has been referenced by the source code. 5482void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5483 assert(D && "No declaration?"); 5484 5485 if (D->isUsed()) 5486 return; 5487 5488 // Mark a parameter declaration "used", regardless of whether we're in a 5489 // template or not. 5490 if (isa<ParmVarDecl>(D)) 5491 D->setUsed(true); 5492 5493 // Do not mark anything as "used" within a dependent context; wait for 5494 // an instantiation. 5495 if (CurContext->isDependentContext()) 5496 return; 5497 5498 switch (ExprEvalContext) { 5499 case Unevaluated: 5500 // We are in an expression that is not potentially evaluated; do nothing. 5501 return; 5502 5503 case PotentiallyEvaluated: 5504 // We are in a potentially-evaluated expression, so this declaration is 5505 // "used"; handle this below. 5506 break; 5507 5508 case PotentiallyPotentiallyEvaluated: 5509 // We are in an expression that may be potentially evaluated; queue this 5510 // declaration reference until we know whether the expression is 5511 // potentially evaluated. 5512 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5513 return; 5514 } 5515 5516 // Note that this declaration has been used. 5517 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5518 unsigned TypeQuals; 5519 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5520 if (!Constructor->isUsed()) 5521 DefineImplicitDefaultConstructor(Loc, Constructor); 5522 } 5523 else if (Constructor->isImplicit() && 5524 Constructor->isCopyConstructor(Context, TypeQuals)) { 5525 if (!Constructor->isUsed()) 5526 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5527 } 5528 // FIXME: more checking for other implicits go here. 5529 else 5530 Constructor->setUsed(true); 5531 } 5532 5533 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5534 // Implicit instantiation of function templates 5535 if (!Function->getBody(Context)) { 5536 if (Function->getInstantiatedFromMemberFunction()) 5537 PendingImplicitInstantiations.push(std::make_pair(Function, Loc)); 5538 5539 // FIXME: check for function template specializations. 5540 } 5541 5542 5543 // FIXME: keep track of references to static functions 5544 Function->setUsed(true); 5545 return; 5546 } 5547 5548 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5549 (void)Var; 5550 // FIXME: implicit template instantiation 5551 // FIXME: keep track of references to static data? 5552 D->setUsed(true); 5553 } 5554} 5555 5556