SemaExpr.cpp revision 981892622a7fbb6d0e7eb7759ed7e8039e46bef9
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 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2138 MemberLoc, MemberType)); 2139 } 2140 2141 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 2142 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2143 Var, MemberLoc, 2144 Var->getType().getNonReferenceType())); 2145 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 2146 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2147 MemberFn, MemberLoc, 2148 MemberFn->getType())); 2149 if (OverloadedFunctionDecl *Ovl 2150 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2151 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2152 MemberLoc, Context.OverloadTy)); 2153 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 2154 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2155 Enum, MemberLoc, Enum->getType())); 2156 if (isa<TypeDecl>(MemberDecl)) 2157 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2158 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2159 2160 // We found a declaration kind that we didn't expect. This is a 2161 // generic error message that tells the user that she can't refer 2162 // to this member with '.' or '->'. 2163 return ExprError(Diag(MemberLoc, 2164 diag::err_typecheck_member_reference_unknown) 2165 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2166 } 2167 2168 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2169 // (*Obj).ivar. 2170 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2171 ObjCInterfaceDecl *ClassDeclared; 2172 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2173 &Member, 2174 ClassDeclared)) { 2175 // If the decl being referenced had an error, return an error for this 2176 // sub-expr without emitting another error, in order to avoid cascading 2177 // error cases. 2178 if (IV->isInvalidDecl()) 2179 return ExprError(); 2180 2181 // Check whether we can reference this field. 2182 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2183 return ExprError(); 2184 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2185 IV->getAccessControl() != ObjCIvarDecl::Package) { 2186 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2187 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2188 ClassOfMethodDecl = MD->getClassInterface(); 2189 else if (ObjCImpDecl && getCurFunctionDecl()) { 2190 // Case of a c-function declared inside an objc implementation. 2191 // FIXME: For a c-style function nested inside an objc implementation 2192 // class, there is no implementation context available, so we pass 2193 // down the context as argument to this routine. Ideally, this context 2194 // need be passed down in the AST node and somehow calculated from the 2195 // AST for a function decl. 2196 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2197 if (ObjCImplementationDecl *IMPD = 2198 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2199 ClassOfMethodDecl = IMPD->getClassInterface(); 2200 else if (ObjCCategoryImplDecl* CatImplClass = 2201 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2202 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2203 } 2204 2205 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2206 if (ClassDeclared != IFTy->getDecl() || 2207 ClassOfMethodDecl != ClassDeclared) 2208 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2209 } 2210 // @protected 2211 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2212 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2213 } 2214 2215 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2216 MemberLoc, BaseExpr, 2217 OpKind == tok::arrow)); 2218 } 2219 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2220 << IFTy->getDecl()->getDeclName() << &Member 2221 << BaseExpr->getSourceRange()); 2222 } 2223 2224 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2225 // pointer to a (potentially qualified) interface type. 2226 const PointerType *PTy; 2227 const ObjCInterfaceType *IFTy; 2228 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2229 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2230 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2231 2232 // Search for a declared property first. 2233 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2234 &Member)) { 2235 // Check whether we can reference this property. 2236 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2237 return ExprError(); 2238 QualType ResTy = PD->getType(); 2239 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2240 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2241 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2242 ResTy = Getter->getResultType(); 2243 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2244 MemberLoc, BaseExpr)); 2245 } 2246 2247 // Check protocols on qualified interfaces. 2248 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2249 E = IFTy->qual_end(); I != E; ++I) 2250 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2251 &Member)) { 2252 // Check whether we can reference this property. 2253 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2254 return ExprError(); 2255 2256 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2257 MemberLoc, BaseExpr)); 2258 } 2259 2260 // If that failed, look for an "implicit" property by seeing if the nullary 2261 // selector is implemented. 2262 2263 // FIXME: The logic for looking up nullary and unary selectors should be 2264 // shared with the code in ActOnInstanceMessage. 2265 2266 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2267 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2268 2269 // If this reference is in an @implementation, check for 'private' methods. 2270 if (!Getter) 2271 Getter = FindMethodInNestedImplementations(IFace, Sel); 2272 2273 // Look through local category implementations associated with the class. 2274 if (!Getter) { 2275 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2276 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2277 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2278 } 2279 } 2280 if (Getter) { 2281 // Check if we can reference this property. 2282 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2283 return ExprError(); 2284 } 2285 // If we found a getter then this may be a valid dot-reference, we 2286 // will look for the matching setter, in case it is needed. 2287 Selector SetterSel = 2288 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2289 PP.getSelectorTable(), &Member); 2290 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2291 if (!Setter) { 2292 // If this reference is in an @implementation, also check for 'private' 2293 // methods. 2294 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2295 } 2296 // Look through local category implementations associated with the class. 2297 if (!Setter) { 2298 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2299 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2300 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2301 } 2302 } 2303 2304 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2305 return ExprError(); 2306 2307 if (Getter || Setter) { 2308 QualType PType; 2309 2310 if (Getter) 2311 PType = Getter->getResultType(); 2312 else { 2313 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2314 E = Setter->param_end(); PI != E; ++PI) 2315 PType = (*PI)->getType(); 2316 } 2317 // FIXME: we must check that the setter has property type. 2318 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2319 Setter, MemberLoc, BaseExpr)); 2320 } 2321 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2322 << &Member << BaseType); 2323 } 2324 // Handle properties on qualified "id" protocols. 2325 const ObjCObjectPointerType *QIdTy; 2326 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2327 // Check protocols on qualified interfaces. 2328 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2329 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2330 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2331 // Check the use of this declaration 2332 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2333 return ExprError(); 2334 2335 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2336 MemberLoc, BaseExpr)); 2337 } 2338 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2339 // Check the use of this method. 2340 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2341 return ExprError(); 2342 2343 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2344 OMD->getResultType(), 2345 OMD, OpLoc, MemberLoc, 2346 NULL, 0)); 2347 } 2348 } 2349 2350 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2351 << &Member << BaseType); 2352 } 2353 // Handle properties on ObjC 'Class' types. 2354 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2355 // Also must look for a getter name which uses property syntax. 2356 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2357 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2358 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2359 ObjCMethodDecl *Getter; 2360 // FIXME: need to also look locally in the implementation. 2361 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2362 // Check the use of this method. 2363 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2364 return ExprError(); 2365 } 2366 // If we found a getter then this may be a valid dot-reference, we 2367 // will look for the matching setter, in case it is needed. 2368 Selector SetterSel = 2369 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2370 PP.getSelectorTable(), &Member); 2371 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2372 if (!Setter) { 2373 // If this reference is in an @implementation, also check for 'private' 2374 // methods. 2375 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2376 } 2377 // Look through local category implementations associated with the class. 2378 if (!Setter) { 2379 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2380 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2381 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2382 } 2383 } 2384 2385 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2386 return ExprError(); 2387 2388 if (Getter || Setter) { 2389 QualType PType; 2390 2391 if (Getter) 2392 PType = Getter->getResultType(); 2393 else { 2394 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2395 E = Setter->param_end(); PI != E; ++PI) 2396 PType = (*PI)->getType(); 2397 } 2398 // FIXME: we must check that the setter has property type. 2399 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2400 Setter, MemberLoc, BaseExpr)); 2401 } 2402 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2403 << &Member << BaseType); 2404 } 2405 } 2406 2407 // Handle 'field access' to vectors, such as 'V.xx'. 2408 if (BaseType->isExtVectorType()) { 2409 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2410 if (ret.isNull()) 2411 return ExprError(); 2412 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2413 MemberLoc)); 2414 } 2415 2416 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2417 << BaseType << BaseExpr->getSourceRange(); 2418 2419 // If the user is trying to apply -> or . to a function or function 2420 // pointer, it's probably because they forgot parentheses to call 2421 // the function. Suggest the addition of those parentheses. 2422 if (BaseType == Context.OverloadTy || 2423 BaseType->isFunctionType() || 2424 (BaseType->isPointerType() && 2425 BaseType->getAsPointerType()->isFunctionType())) { 2426 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2427 Diag(Loc, diag::note_member_reference_needs_call) 2428 << CodeModificationHint::CreateInsertion(Loc, "()"); 2429 } 2430 2431 return ExprError(); 2432} 2433 2434/// ConvertArgumentsForCall - Converts the arguments specified in 2435/// Args/NumArgs to the parameter types of the function FDecl with 2436/// function prototype Proto. Call is the call expression itself, and 2437/// Fn is the function expression. For a C++ member function, this 2438/// routine does not attempt to convert the object argument. Returns 2439/// true if the call is ill-formed. 2440bool 2441Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2442 FunctionDecl *FDecl, 2443 const FunctionProtoType *Proto, 2444 Expr **Args, unsigned NumArgs, 2445 SourceLocation RParenLoc) { 2446 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2447 // assignment, to the types of the corresponding parameter, ... 2448 unsigned NumArgsInProto = Proto->getNumArgs(); 2449 unsigned NumArgsToCheck = NumArgs; 2450 bool Invalid = false; 2451 2452 // If too few arguments are available (and we don't have default 2453 // arguments for the remaining parameters), don't make the call. 2454 if (NumArgs < NumArgsInProto) { 2455 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2456 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2457 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2458 // Use default arguments for missing arguments 2459 NumArgsToCheck = NumArgsInProto; 2460 Call->setNumArgs(Context, NumArgsInProto); 2461 } 2462 2463 // If too many are passed and not variadic, error on the extras and drop 2464 // them. 2465 if (NumArgs > NumArgsInProto) { 2466 if (!Proto->isVariadic()) { 2467 Diag(Args[NumArgsInProto]->getLocStart(), 2468 diag::err_typecheck_call_too_many_args) 2469 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2470 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2471 Args[NumArgs-1]->getLocEnd()); 2472 // This deletes the extra arguments. 2473 Call->setNumArgs(Context, NumArgsInProto); 2474 Invalid = true; 2475 } 2476 NumArgsToCheck = NumArgsInProto; 2477 } 2478 2479 // Continue to check argument types (even if we have too few/many args). 2480 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2481 QualType ProtoArgType = Proto->getArgType(i); 2482 2483 Expr *Arg; 2484 if (i < NumArgs) { 2485 Arg = Args[i]; 2486 2487 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2488 ProtoArgType, 2489 diag::err_call_incomplete_argument, 2490 Arg->getSourceRange())) 2491 return true; 2492 2493 // Pass the argument. 2494 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2495 return true; 2496 } else { 2497 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2498 Diag (Call->getSourceRange().getBegin(), 2499 diag::err_use_of_default_argument_to_function_declared_later) << 2500 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2501 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2502 diag::note_default_argument_declared_here); 2503 } else { 2504 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2505 2506 // If the default expression creates temporaries, we need to 2507 // push them to the current stack of expression temporaries so they'll 2508 // be properly destroyed. 2509 if (CXXExprWithTemporaries *E 2510 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2511 assert(!E->shouldDestroyTemporaries() && 2512 "Can't destroy temporaries in a default argument expr!"); 2513 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2514 ExprTemporaries.push_back(E->getTemporary(I)); 2515 } 2516 } 2517 2518 // We already type-checked the argument, so we know it works. 2519 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2520 } 2521 2522 QualType ArgType = Arg->getType(); 2523 2524 Call->setArg(i, Arg); 2525 } 2526 2527 // If this is a variadic call, handle args passed through "...". 2528 if (Proto->isVariadic()) { 2529 VariadicCallType CallType = VariadicFunction; 2530 if (Fn->getType()->isBlockPointerType()) 2531 CallType = VariadicBlock; // Block 2532 else if (isa<MemberExpr>(Fn)) 2533 CallType = VariadicMethod; 2534 2535 // Promote the arguments (C99 6.5.2.2p7). 2536 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2537 Expr *Arg = Args[i]; 2538 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2539 Call->setArg(i, Arg); 2540 } 2541 } 2542 2543 return Invalid; 2544} 2545 2546/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2547/// This provides the location of the left/right parens and a list of comma 2548/// locations. 2549Action::OwningExprResult 2550Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2551 MultiExprArg args, 2552 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2553 unsigned NumArgs = args.size(); 2554 Expr *Fn = fn.takeAs<Expr>(); 2555 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2556 assert(Fn && "no function call expression"); 2557 FunctionDecl *FDecl = NULL; 2558 NamedDecl *NDecl = NULL; 2559 DeclarationName UnqualifiedName; 2560 2561 if (getLangOptions().CPlusPlus) { 2562 // Determine whether this is a dependent call inside a C++ template, 2563 // in which case we won't do any semantic analysis now. 2564 // FIXME: Will need to cache the results of name lookup (including ADL) in 2565 // Fn. 2566 bool Dependent = false; 2567 if (Fn->isTypeDependent()) 2568 Dependent = true; 2569 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2570 Dependent = true; 2571 2572 if (Dependent) 2573 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2574 Context.DependentTy, RParenLoc)); 2575 2576 // Determine whether this is a call to an object (C++ [over.call.object]). 2577 if (Fn->getType()->isRecordType()) 2578 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2579 CommaLocs, RParenLoc)); 2580 2581 // Determine whether this is a call to a member function. 2582 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2583 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2584 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2585 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2586 CommaLocs, RParenLoc)); 2587 } 2588 2589 // If we're directly calling a function, get the appropriate declaration. 2590 DeclRefExpr *DRExpr = NULL; 2591 Expr *FnExpr = Fn; 2592 bool ADL = true; 2593 while (true) { 2594 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2595 FnExpr = IcExpr->getSubExpr(); 2596 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2597 // Parentheses around a function disable ADL 2598 // (C++0x [basic.lookup.argdep]p1). 2599 ADL = false; 2600 FnExpr = PExpr->getSubExpr(); 2601 } else if (isa<UnaryOperator>(FnExpr) && 2602 cast<UnaryOperator>(FnExpr)->getOpcode() 2603 == UnaryOperator::AddrOf) { 2604 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2605 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2606 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2607 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2608 break; 2609 } else if (UnresolvedFunctionNameExpr *DepName 2610 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2611 UnqualifiedName = DepName->getName(); 2612 break; 2613 } else { 2614 // Any kind of name that does not refer to a declaration (or 2615 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2616 ADL = false; 2617 break; 2618 } 2619 } 2620 2621 OverloadedFunctionDecl *Ovl = 0; 2622 if (DRExpr) { 2623 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2624 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2625 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2626 } 2627 2628 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2629 // We don't perform ADL for implicit declarations of builtins. 2630 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2631 ADL = false; 2632 2633 // We don't perform ADL in C. 2634 if (!getLangOptions().CPlusPlus) 2635 ADL = false; 2636 2637 if (Ovl || ADL) { 2638 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2639 UnqualifiedName, LParenLoc, Args, 2640 NumArgs, CommaLocs, RParenLoc, ADL); 2641 if (!FDecl) 2642 return ExprError(); 2643 2644 // Update Fn to refer to the actual function selected. 2645 Expr *NewFn = 0; 2646 if (QualifiedDeclRefExpr *QDRExpr 2647 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2648 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2649 QDRExpr->getLocation(), 2650 false, false, 2651 QDRExpr->getQualifierRange(), 2652 QDRExpr->getQualifier()); 2653 else 2654 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2655 Fn->getSourceRange().getBegin()); 2656 Fn->Destroy(Context); 2657 Fn = NewFn; 2658 } 2659 } 2660 2661 // Promote the function operand. 2662 UsualUnaryConversions(Fn); 2663 2664 // Make the call expr early, before semantic checks. This guarantees cleanup 2665 // of arguments and function on error. 2666 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2667 Args, NumArgs, 2668 Context.BoolTy, 2669 RParenLoc)); 2670 2671 const FunctionType *FuncT; 2672 if (!Fn->getType()->isBlockPointerType()) { 2673 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2674 // have type pointer to function". 2675 const PointerType *PT = Fn->getType()->getAsPointerType(); 2676 if (PT == 0) 2677 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2678 << Fn->getType() << Fn->getSourceRange()); 2679 FuncT = PT->getPointeeType()->getAsFunctionType(); 2680 } else { // This is a block call. 2681 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2682 getAsFunctionType(); 2683 } 2684 if (FuncT == 0) 2685 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2686 << Fn->getType() << Fn->getSourceRange()); 2687 2688 // Check for a valid return type 2689 if (!FuncT->getResultType()->isVoidType() && 2690 RequireCompleteType(Fn->getSourceRange().getBegin(), 2691 FuncT->getResultType(), 2692 diag::err_call_incomplete_return, 2693 TheCall->getSourceRange())) 2694 return ExprError(); 2695 2696 // We know the result type of the call, set it. 2697 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2698 2699 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2700 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2701 RParenLoc)) 2702 return ExprError(); 2703 } else { 2704 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2705 2706 if (FDecl) { 2707 // Check if we have too few/too many template arguments, based 2708 // on our knowledge of the function definition. 2709 const FunctionDecl *Def = 0; 2710 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) { 2711 const FunctionProtoType *Proto = 2712 Def->getType()->getAsFunctionProtoType(); 2713 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2714 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2715 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2716 } 2717 } 2718 } 2719 2720 // Promote the arguments (C99 6.5.2.2p6). 2721 for (unsigned i = 0; i != NumArgs; i++) { 2722 Expr *Arg = Args[i]; 2723 DefaultArgumentPromotion(Arg); 2724 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2725 Arg->getType(), 2726 diag::err_call_incomplete_argument, 2727 Arg->getSourceRange())) 2728 return ExprError(); 2729 TheCall->setArg(i, Arg); 2730 } 2731 } 2732 2733 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2734 if (!Method->isStatic()) 2735 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2736 << Fn->getSourceRange()); 2737 2738 // Check for sentinels 2739 if (NDecl) 2740 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2741 // Do special checking on direct calls to functions. 2742 if (FDecl) 2743 return CheckFunctionCall(FDecl, TheCall.take()); 2744 if (NDecl) 2745 return CheckBlockCall(NDecl, TheCall.take()); 2746 2747 return Owned(TheCall.take()); 2748} 2749 2750Action::OwningExprResult 2751Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2752 SourceLocation RParenLoc, ExprArg InitExpr) { 2753 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2754 QualType literalType = QualType::getFromOpaquePtr(Ty); 2755 // FIXME: put back this assert when initializers are worked out. 2756 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2757 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2758 2759 if (literalType->isArrayType()) { 2760 if (literalType->isVariableArrayType()) 2761 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2762 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2763 } else if (!literalType->isDependentType() && 2764 RequireCompleteType(LParenLoc, literalType, 2765 diag::err_typecheck_decl_incomplete_type, 2766 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2767 return ExprError(); 2768 2769 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2770 DeclarationName(), /*FIXME:DirectInit=*/false)) 2771 return ExprError(); 2772 2773 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2774 if (isFileScope) { // 6.5.2.5p3 2775 if (CheckForConstantInitializer(literalExpr, literalType)) 2776 return ExprError(); 2777 } 2778 InitExpr.release(); 2779 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2780 literalExpr, isFileScope)); 2781} 2782 2783Action::OwningExprResult 2784Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2785 SourceLocation RBraceLoc) { 2786 unsigned NumInit = initlist.size(); 2787 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2788 2789 // Semantic analysis for initializers is done by ActOnDeclarator() and 2790 // CheckInitializer() - it requires knowledge of the object being intialized. 2791 2792 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2793 RBraceLoc); 2794 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2795 return Owned(E); 2796} 2797 2798/// CheckCastTypes - Check type constraints for casting between types. 2799bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2800 UsualUnaryConversions(castExpr); 2801 2802 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2803 // type needs to be scalar. 2804 if (castType->isVoidType()) { 2805 // Cast to void allows any expr type. 2806 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2807 // We can't check any more until template instantiation time. 2808 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2809 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2810 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2811 (castType->isStructureType() || castType->isUnionType())) { 2812 // GCC struct/union extension: allow cast to self. 2813 // FIXME: Check that the cast destination type is complete. 2814 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2815 << castType << castExpr->getSourceRange(); 2816 } else if (castType->isUnionType()) { 2817 // GCC cast to union extension 2818 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2819 RecordDecl::field_iterator Field, FieldEnd; 2820 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2821 Field != FieldEnd; ++Field) { 2822 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2823 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2824 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2825 << castExpr->getSourceRange(); 2826 break; 2827 } 2828 } 2829 if (Field == FieldEnd) 2830 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2831 << castExpr->getType() << castExpr->getSourceRange(); 2832 } else { 2833 // Reject any other conversions to non-scalar types. 2834 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2835 << castType << castExpr->getSourceRange(); 2836 } 2837 } else if (!castExpr->getType()->isScalarType() && 2838 !castExpr->getType()->isVectorType()) { 2839 return Diag(castExpr->getLocStart(), 2840 diag::err_typecheck_expect_scalar_operand) 2841 << castExpr->getType() << castExpr->getSourceRange(); 2842 } else if (castExpr->getType()->isVectorType()) { 2843 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2844 return true; 2845 } else if (castType->isVectorType()) { 2846 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2847 return true; 2848 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2849 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2850 } else if (!castType->isArithmeticType()) { 2851 QualType castExprType = castExpr->getType(); 2852 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2853 return Diag(castExpr->getLocStart(), 2854 diag::err_cast_pointer_from_non_pointer_int) 2855 << castExprType << castExpr->getSourceRange(); 2856 } else if (!castExpr->getType()->isArithmeticType()) { 2857 if (!castType->isIntegralType() && castType->isArithmeticType()) 2858 return Diag(castExpr->getLocStart(), 2859 diag::err_cast_pointer_to_non_pointer_int) 2860 << castType << castExpr->getSourceRange(); 2861 } 2862 if (isa<ObjCSelectorExpr>(castExpr)) 2863 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2864 return false; 2865} 2866 2867bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2868 assert(VectorTy->isVectorType() && "Not a vector type!"); 2869 2870 if (Ty->isVectorType() || Ty->isIntegerType()) { 2871 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2872 return Diag(R.getBegin(), 2873 Ty->isVectorType() ? 2874 diag::err_invalid_conversion_between_vectors : 2875 diag::err_invalid_conversion_between_vector_and_integer) 2876 << VectorTy << Ty << R; 2877 } else 2878 return Diag(R.getBegin(), 2879 diag::err_invalid_conversion_between_vector_and_scalar) 2880 << VectorTy << Ty << R; 2881 2882 return false; 2883} 2884 2885Action::OwningExprResult 2886Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2887 SourceLocation RParenLoc, ExprArg Op) { 2888 assert((Ty != 0) && (Op.get() != 0) && 2889 "ActOnCastExpr(): missing type or expr"); 2890 2891 Expr *castExpr = Op.takeAs<Expr>(); 2892 QualType castType = QualType::getFromOpaquePtr(Ty); 2893 2894 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2895 return ExprError(); 2896 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2897 LParenLoc, RParenLoc)); 2898} 2899 2900/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2901/// In that case, lhs = cond. 2902/// C99 6.5.15 2903QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2904 SourceLocation QuestionLoc) { 2905 // C++ is sufficiently different to merit its own checker. 2906 if (getLangOptions().CPlusPlus) 2907 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2908 2909 UsualUnaryConversions(Cond); 2910 UsualUnaryConversions(LHS); 2911 UsualUnaryConversions(RHS); 2912 QualType CondTy = Cond->getType(); 2913 QualType LHSTy = LHS->getType(); 2914 QualType RHSTy = RHS->getType(); 2915 2916 // first, check the condition. 2917 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2918 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2919 << CondTy; 2920 return QualType(); 2921 } 2922 2923 // Now check the two expressions. 2924 2925 // If both operands have arithmetic type, do the usual arithmetic conversions 2926 // to find a common type: C99 6.5.15p3,5. 2927 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2928 UsualArithmeticConversions(LHS, RHS); 2929 return LHS->getType(); 2930 } 2931 2932 // If both operands are the same structure or union type, the result is that 2933 // type. 2934 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2935 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2936 if (LHSRT->getDecl() == RHSRT->getDecl()) 2937 // "If both the operands have structure or union type, the result has 2938 // that type." This implies that CV qualifiers are dropped. 2939 return LHSTy.getUnqualifiedType(); 2940 // FIXME: Type of conditional expression must be complete in C mode. 2941 } 2942 2943 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2944 // The following || allows only one side to be void (a GCC-ism). 2945 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2946 if (!LHSTy->isVoidType()) 2947 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2948 << RHS->getSourceRange(); 2949 if (!RHSTy->isVoidType()) 2950 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2951 << LHS->getSourceRange(); 2952 ImpCastExprToType(LHS, Context.VoidTy); 2953 ImpCastExprToType(RHS, Context.VoidTy); 2954 return Context.VoidTy; 2955 } 2956 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2957 // the type of the other operand." 2958 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2959 Context.isObjCObjectPointerType(LHSTy)) && 2960 RHS->isNullPointerConstant(Context)) { 2961 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2962 return LHSTy; 2963 } 2964 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2965 Context.isObjCObjectPointerType(RHSTy)) && 2966 LHS->isNullPointerConstant(Context)) { 2967 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2968 return RHSTy; 2969 } 2970 2971 const PointerType *LHSPT = LHSTy->getAsPointerType(); 2972 const PointerType *RHSPT = RHSTy->getAsPointerType(); 2973 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 2974 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); 2975 2976 // Handle the case where both operands are pointers before we handle null 2977 // pointer constants in case both operands are null pointer constants. 2978 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 2979 // get the "pointed to" types 2980 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 2981 : LHSBPT->getPointeeType()); 2982 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 2983 : RHSBPT->getPointeeType()); 2984 2985 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2986 if (lhptee->isVoidType() 2987 && (RHSBPT || rhptee->isIncompleteOrObjectType())) { 2988 // Figure out necessary qualifiers (C99 6.5.15p6) 2989 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2990 QualType destType = Context.getPointerType(destPointee); 2991 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2992 ImpCastExprToType(RHS, destType); // promote to void* 2993 return destType; 2994 } 2995 if (rhptee->isVoidType() 2996 && (LHSBPT || lhptee->isIncompleteOrObjectType())) { 2997 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2998 QualType destType = Context.getPointerType(destPointee); 2999 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3000 ImpCastExprToType(RHS, destType); // promote to void* 3001 return destType; 3002 } 3003 3004 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 3005 if (sameKind 3006 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3007 // Two identical pointer types are always compatible. 3008 return LHSTy; 3009 } 3010 3011 QualType compositeType = LHSTy; 3012 3013 // If either type is an Objective-C object type then check 3014 // compatibility according to Objective-C. 3015 if (Context.isObjCObjectPointerType(LHSTy) || 3016 Context.isObjCObjectPointerType(RHSTy)) { 3017 // If both operands are interfaces and either operand can be 3018 // assigned to the other, use that type as the composite 3019 // type. This allows 3020 // xxx ? (A*) a : (B*) b 3021 // where B is a subclass of A. 3022 // 3023 // Additionally, as for assignment, if either type is 'id' 3024 // allow silent coercion. Finally, if the types are 3025 // incompatible then make sure to use 'id' as the composite 3026 // type so the result is acceptable for sending messages to. 3027 3028 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3029 // It could return the composite type. 3030 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3031 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3032 if (LHSIface && RHSIface && 3033 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3034 compositeType = LHSTy; 3035 } else if (LHSIface && RHSIface && 3036 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3037 compositeType = RHSTy; 3038 } else if (Context.isObjCIdStructType(lhptee) || 3039 Context.isObjCIdStructType(rhptee)) { 3040 compositeType = Context.getObjCIdType(); 3041 } else if (LHSBPT || RHSBPT) { 3042 if (!sameKind 3043 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3044 rhptee.getUnqualifiedType())) 3045 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3046 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3047 return QualType(); 3048 } else { 3049 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3050 << LHSTy << RHSTy 3051 << LHS->getSourceRange() << RHS->getSourceRange(); 3052 QualType incompatTy = Context.getObjCIdType(); 3053 ImpCastExprToType(LHS, incompatTy); 3054 ImpCastExprToType(RHS, incompatTy); 3055 return incompatTy; 3056 } 3057 } else if (!sameKind 3058 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3059 rhptee.getUnqualifiedType())) { 3060 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3061 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3062 // In this situation, we assume void* type. No especially good 3063 // reason, but this is what gcc does, and we do have to pick 3064 // to get a consistent AST. 3065 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3066 ImpCastExprToType(LHS, incompatTy); 3067 ImpCastExprToType(RHS, incompatTy); 3068 return incompatTy; 3069 } 3070 // The pointer types are compatible. 3071 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3072 // differently qualified versions of compatible types, the result type is 3073 // a pointer to an appropriately qualified version of the *composite* 3074 // type. 3075 // FIXME: Need to calculate the composite type. 3076 // FIXME: Need to add qualifiers 3077 ImpCastExprToType(LHS, compositeType); 3078 ImpCastExprToType(RHS, compositeType); 3079 return compositeType; 3080 } 3081 3082 // GCC compatibility: soften pointer/integer mismatch. 3083 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3084 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3085 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3086 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3087 return RHSTy; 3088 } 3089 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3090 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3091 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3092 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3093 return LHSTy; 3094 } 3095 3096 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3097 // evaluates to "struct objc_object *" (and is handled above when comparing 3098 // id with statically typed objects). 3099 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3100 // GCC allows qualified id and any Objective-C type to devolve to 3101 // id. Currently localizing to here until clear this should be 3102 // part of ObjCQualifiedIdTypesAreCompatible. 3103 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3104 (LHSTy->isObjCQualifiedIdType() && 3105 Context.isObjCObjectPointerType(RHSTy)) || 3106 (RHSTy->isObjCQualifiedIdType() && 3107 Context.isObjCObjectPointerType(LHSTy))) { 3108 // FIXME: This is not the correct composite type. This only happens to 3109 // work because id can more or less be used anywhere, however this may 3110 // change the type of method sends. 3111 3112 // FIXME: gcc adds some type-checking of the arguments and emits 3113 // (confusing) incompatible comparison warnings in some 3114 // cases. Investigate. 3115 QualType compositeType = Context.getObjCIdType(); 3116 ImpCastExprToType(LHS, compositeType); 3117 ImpCastExprToType(RHS, compositeType); 3118 return compositeType; 3119 } 3120 } 3121 3122 // Otherwise, the operands are not compatible. 3123 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3124 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3125 return QualType(); 3126} 3127 3128/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3129/// in the case of a the GNU conditional expr extension. 3130Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3131 SourceLocation ColonLoc, 3132 ExprArg Cond, ExprArg LHS, 3133 ExprArg RHS) { 3134 Expr *CondExpr = (Expr *) Cond.get(); 3135 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3136 3137 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3138 // was the condition. 3139 bool isLHSNull = LHSExpr == 0; 3140 if (isLHSNull) 3141 LHSExpr = CondExpr; 3142 3143 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3144 RHSExpr, QuestionLoc); 3145 if (result.isNull()) 3146 return ExprError(); 3147 3148 Cond.release(); 3149 LHS.release(); 3150 RHS.release(); 3151 return Owned(new (Context) ConditionalOperator(CondExpr, 3152 isLHSNull ? 0 : LHSExpr, 3153 RHSExpr, result)); 3154} 3155 3156 3157// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3158// being closely modeled after the C99 spec:-). The odd characteristic of this 3159// routine is it effectively iqnores the qualifiers on the top level pointee. 3160// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3161// FIXME: add a couple examples in this comment. 3162Sema::AssignConvertType 3163Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3164 QualType lhptee, rhptee; 3165 3166 // get the "pointed to" type (ignoring qualifiers at the top level) 3167 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3168 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3169 3170 // make sure we operate on the canonical type 3171 lhptee = Context.getCanonicalType(lhptee); 3172 rhptee = Context.getCanonicalType(rhptee); 3173 3174 AssignConvertType ConvTy = Compatible; 3175 3176 // C99 6.5.16.1p1: This following citation is common to constraints 3177 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3178 // qualifiers of the type *pointed to* by the right; 3179 // FIXME: Handle ExtQualType 3180 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3181 ConvTy = CompatiblePointerDiscardsQualifiers; 3182 3183 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3184 // incomplete type and the other is a pointer to a qualified or unqualified 3185 // version of void... 3186 if (lhptee->isVoidType()) { 3187 if (rhptee->isIncompleteOrObjectType()) 3188 return ConvTy; 3189 3190 // As an extension, we allow cast to/from void* to function pointer. 3191 assert(rhptee->isFunctionType()); 3192 return FunctionVoidPointer; 3193 } 3194 3195 if (rhptee->isVoidType()) { 3196 if (lhptee->isIncompleteOrObjectType()) 3197 return ConvTy; 3198 3199 // As an extension, we allow cast to/from void* to function pointer. 3200 assert(lhptee->isFunctionType()); 3201 return FunctionVoidPointer; 3202 } 3203 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3204 // unqualified versions of compatible types, ... 3205 lhptee = lhptee.getUnqualifiedType(); 3206 rhptee = rhptee.getUnqualifiedType(); 3207 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3208 // Check if the pointee types are compatible ignoring the sign. 3209 // We explicitly check for char so that we catch "char" vs 3210 // "unsigned char" on systems where "char" is unsigned. 3211 if (lhptee->isCharType()) { 3212 lhptee = Context.UnsignedCharTy; 3213 } else if (lhptee->isSignedIntegerType()) { 3214 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3215 } 3216 if (rhptee->isCharType()) { 3217 rhptee = Context.UnsignedCharTy; 3218 } else if (rhptee->isSignedIntegerType()) { 3219 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3220 } 3221 if (lhptee == rhptee) { 3222 // Types are compatible ignoring the sign. Qualifier incompatibility 3223 // takes priority over sign incompatibility because the sign 3224 // warning can be disabled. 3225 if (ConvTy != Compatible) 3226 return ConvTy; 3227 return IncompatiblePointerSign; 3228 } 3229 // General pointer incompatibility takes priority over qualifiers. 3230 return IncompatiblePointer; 3231 } 3232 return ConvTy; 3233} 3234 3235/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3236/// block pointer types are compatible or whether a block and normal pointer 3237/// are compatible. It is more restrict than comparing two function pointer 3238// types. 3239Sema::AssignConvertType 3240Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3241 QualType rhsType) { 3242 QualType lhptee, rhptee; 3243 3244 // get the "pointed to" type (ignoring qualifiers at the top level) 3245 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3246 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3247 3248 // make sure we operate on the canonical type 3249 lhptee = Context.getCanonicalType(lhptee); 3250 rhptee = Context.getCanonicalType(rhptee); 3251 3252 AssignConvertType ConvTy = Compatible; 3253 3254 // For blocks we enforce that qualifiers are identical. 3255 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3256 ConvTy = CompatiblePointerDiscardsQualifiers; 3257 3258 if (!Context.typesAreCompatible(lhptee, rhptee)) 3259 return IncompatibleBlockPointer; 3260 return ConvTy; 3261} 3262 3263/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3264/// has code to accommodate several GCC extensions when type checking 3265/// pointers. Here are some objectionable examples that GCC considers warnings: 3266/// 3267/// int a, *pint; 3268/// short *pshort; 3269/// struct foo *pfoo; 3270/// 3271/// pint = pshort; // warning: assignment from incompatible pointer type 3272/// a = pint; // warning: assignment makes integer from pointer without a cast 3273/// pint = a; // warning: assignment makes pointer from integer without a cast 3274/// pint = pfoo; // warning: assignment from incompatible pointer type 3275/// 3276/// As a result, the code for dealing with pointers is more complex than the 3277/// C99 spec dictates. 3278/// 3279Sema::AssignConvertType 3280Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3281 // Get canonical types. We're not formatting these types, just comparing 3282 // them. 3283 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3284 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3285 3286 if (lhsType == rhsType) 3287 return Compatible; // Common case: fast path an exact match. 3288 3289 // If the left-hand side is a reference type, then we are in a 3290 // (rare!) case where we've allowed the use of references in C, 3291 // e.g., as a parameter type in a built-in function. In this case, 3292 // just make sure that the type referenced is compatible with the 3293 // right-hand side type. The caller is responsible for adjusting 3294 // lhsType so that the resulting expression does not have reference 3295 // type. 3296 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3297 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3298 return Compatible; 3299 return Incompatible; 3300 } 3301 3302 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3303 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3304 return Compatible; 3305 // Relax integer conversions like we do for pointers below. 3306 if (rhsType->isIntegerType()) 3307 return IntToPointer; 3308 if (lhsType->isIntegerType()) 3309 return PointerToInt; 3310 return IncompatibleObjCQualifiedId; 3311 } 3312 3313 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3314 // For ExtVector, allow vector splats; float -> <n x float> 3315 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3316 if (LV->getElementType() == rhsType) 3317 return Compatible; 3318 3319 // If we are allowing lax vector conversions, and LHS and RHS are both 3320 // vectors, the total size only needs to be the same. This is a bitcast; 3321 // no bits are changed but the result type is different. 3322 if (getLangOptions().LaxVectorConversions && 3323 lhsType->isVectorType() && rhsType->isVectorType()) { 3324 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3325 return IncompatibleVectors; 3326 } 3327 return Incompatible; 3328 } 3329 3330 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3331 return Compatible; 3332 3333 if (isa<PointerType>(lhsType)) { 3334 if (rhsType->isIntegerType()) 3335 return IntToPointer; 3336 3337 if (isa<PointerType>(rhsType)) 3338 return CheckPointerTypesForAssignment(lhsType, rhsType); 3339 3340 if (rhsType->getAsBlockPointerType()) { 3341 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3342 return Compatible; 3343 3344 // Treat block pointers as objects. 3345 if (getLangOptions().ObjC1 && 3346 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3347 return Compatible; 3348 } 3349 return Incompatible; 3350 } 3351 3352 if (isa<BlockPointerType>(lhsType)) { 3353 if (rhsType->isIntegerType()) 3354 return IntToBlockPointer; 3355 3356 // Treat block pointers as objects. 3357 if (getLangOptions().ObjC1 && 3358 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3359 return Compatible; 3360 3361 if (rhsType->isBlockPointerType()) 3362 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3363 3364 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3365 if (RHSPT->getPointeeType()->isVoidType()) 3366 return Compatible; 3367 } 3368 return Incompatible; 3369 } 3370 3371 if (isa<PointerType>(rhsType)) { 3372 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3373 if (lhsType == Context.BoolTy) 3374 return Compatible; 3375 3376 if (lhsType->isIntegerType()) 3377 return PointerToInt; 3378 3379 if (isa<PointerType>(lhsType)) 3380 return CheckPointerTypesForAssignment(lhsType, rhsType); 3381 3382 if (isa<BlockPointerType>(lhsType) && 3383 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3384 return Compatible; 3385 return Incompatible; 3386 } 3387 3388 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3389 if (Context.typesAreCompatible(lhsType, rhsType)) 3390 return Compatible; 3391 } 3392 return Incompatible; 3393} 3394 3395/// \brief Constructs a transparent union from an expression that is 3396/// used to initialize the transparent union. 3397static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3398 QualType UnionType, FieldDecl *Field) { 3399 // Build an initializer list that designates the appropriate member 3400 // of the transparent union. 3401 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3402 &E, 1, 3403 SourceLocation()); 3404 Initializer->setType(UnionType); 3405 Initializer->setInitializedFieldInUnion(Field); 3406 3407 // Build a compound literal constructing a value of the transparent 3408 // union type from this initializer list. 3409 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3410 false); 3411} 3412 3413Sema::AssignConvertType 3414Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3415 QualType FromType = rExpr->getType(); 3416 3417 // If the ArgType is a Union type, we want to handle a potential 3418 // transparent_union GCC extension. 3419 const RecordType *UT = ArgType->getAsUnionType(); 3420 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>(Context)) 3421 return Incompatible; 3422 3423 // The field to initialize within the transparent union. 3424 RecordDecl *UD = UT->getDecl(); 3425 FieldDecl *InitField = 0; 3426 // It's compatible if the expression matches any of the fields. 3427 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3428 itend = UD->field_end(Context); 3429 it != itend; ++it) { 3430 if (it->getType()->isPointerType()) { 3431 // If the transparent union contains a pointer type, we allow: 3432 // 1) void pointer 3433 // 2) null pointer constant 3434 if (FromType->isPointerType()) 3435 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3436 ImpCastExprToType(rExpr, it->getType()); 3437 InitField = *it; 3438 break; 3439 } 3440 3441 if (rExpr->isNullPointerConstant(Context)) { 3442 ImpCastExprToType(rExpr, it->getType()); 3443 InitField = *it; 3444 break; 3445 } 3446 } 3447 3448 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3449 == Compatible) { 3450 InitField = *it; 3451 break; 3452 } 3453 } 3454 3455 if (!InitField) 3456 return Incompatible; 3457 3458 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3459 return Compatible; 3460} 3461 3462Sema::AssignConvertType 3463Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3464 if (getLangOptions().CPlusPlus) { 3465 if (!lhsType->isRecordType()) { 3466 // C++ 5.17p3: If the left operand is not of class type, the 3467 // expression is implicitly converted (C++ 4) to the 3468 // cv-unqualified type of the left operand. 3469 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3470 "assigning")) 3471 return Incompatible; 3472 return Compatible; 3473 } 3474 3475 // FIXME: Currently, we fall through and treat C++ classes like C 3476 // structures. 3477 } 3478 3479 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3480 // a null pointer constant. 3481 if ((lhsType->isPointerType() || 3482 lhsType->isObjCQualifiedIdType() || 3483 lhsType->isBlockPointerType()) 3484 && rExpr->isNullPointerConstant(Context)) { 3485 ImpCastExprToType(rExpr, lhsType); 3486 return Compatible; 3487 } 3488 3489 // This check seems unnatural, however it is necessary to ensure the proper 3490 // conversion of functions/arrays. If the conversion were done for all 3491 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3492 // expressions that surpress this implicit conversion (&, sizeof). 3493 // 3494 // Suppress this for references: C++ 8.5.3p5. 3495 if (!lhsType->isReferenceType()) 3496 DefaultFunctionArrayConversion(rExpr); 3497 3498 Sema::AssignConvertType result = 3499 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3500 3501 // C99 6.5.16.1p2: The value of the right operand is converted to the 3502 // type of the assignment expression. 3503 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3504 // so that we can use references in built-in functions even in C. 3505 // The getNonReferenceType() call makes sure that the resulting expression 3506 // does not have reference type. 3507 if (result != Incompatible && rExpr->getType() != lhsType) 3508 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3509 return result; 3510} 3511 3512QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3513 Diag(Loc, diag::err_typecheck_invalid_operands) 3514 << lex->getType() << rex->getType() 3515 << lex->getSourceRange() << rex->getSourceRange(); 3516 return QualType(); 3517} 3518 3519inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3520 Expr *&rex) { 3521 // For conversion purposes, we ignore any qualifiers. 3522 // For example, "const float" and "float" are equivalent. 3523 QualType lhsType = 3524 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3525 QualType rhsType = 3526 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3527 3528 // If the vector types are identical, return. 3529 if (lhsType == rhsType) 3530 return lhsType; 3531 3532 // Handle the case of a vector & extvector type of the same size and element 3533 // type. It would be nice if we only had one vector type someday. 3534 if (getLangOptions().LaxVectorConversions) { 3535 // FIXME: Should we warn here? 3536 if (const VectorType *LV = lhsType->getAsVectorType()) { 3537 if (const VectorType *RV = rhsType->getAsVectorType()) 3538 if (LV->getElementType() == RV->getElementType() && 3539 LV->getNumElements() == RV->getNumElements()) { 3540 return lhsType->isExtVectorType() ? lhsType : rhsType; 3541 } 3542 } 3543 } 3544 3545 // If the lhs is an extended vector and the rhs is a scalar of the same type 3546 // or a literal, promote the rhs to the vector type. 3547 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3548 QualType eltType = V->getElementType(); 3549 3550 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3551 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3552 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3553 ImpCastExprToType(rex, lhsType); 3554 return lhsType; 3555 } 3556 } 3557 3558 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3559 // promote the lhs to the vector type. 3560 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3561 QualType eltType = V->getElementType(); 3562 3563 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3564 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3565 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3566 ImpCastExprToType(lex, rhsType); 3567 return rhsType; 3568 } 3569 } 3570 3571 // You cannot convert between vector values of different size. 3572 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3573 << lex->getType() << rex->getType() 3574 << lex->getSourceRange() << rex->getSourceRange(); 3575 return QualType(); 3576} 3577 3578inline QualType Sema::CheckMultiplyDivideOperands( 3579 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3580{ 3581 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3582 return CheckVectorOperands(Loc, lex, rex); 3583 3584 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3585 3586 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3587 return compType; 3588 return InvalidOperands(Loc, lex, rex); 3589} 3590 3591inline QualType Sema::CheckRemainderOperands( 3592 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3593{ 3594 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3595 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3596 return CheckVectorOperands(Loc, lex, rex); 3597 return InvalidOperands(Loc, lex, rex); 3598 } 3599 3600 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3601 3602 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3603 return compType; 3604 return InvalidOperands(Loc, lex, rex); 3605} 3606 3607inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3608 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3609{ 3610 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3611 QualType compType = CheckVectorOperands(Loc, lex, rex); 3612 if (CompLHSTy) *CompLHSTy = compType; 3613 return compType; 3614 } 3615 3616 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3617 3618 // handle the common case first (both operands are arithmetic). 3619 if (lex->getType()->isArithmeticType() && 3620 rex->getType()->isArithmeticType()) { 3621 if (CompLHSTy) *CompLHSTy = compType; 3622 return compType; 3623 } 3624 3625 // Put any potential pointer into PExp 3626 Expr* PExp = lex, *IExp = rex; 3627 if (IExp->getType()->isPointerType()) 3628 std::swap(PExp, IExp); 3629 3630 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3631 if (IExp->getType()->isIntegerType()) { 3632 QualType PointeeTy = PTy->getPointeeType(); 3633 // Check for arithmetic on pointers to incomplete types. 3634 if (PointeeTy->isVoidType()) { 3635 if (getLangOptions().CPlusPlus) { 3636 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3637 << lex->getSourceRange() << rex->getSourceRange(); 3638 return QualType(); 3639 } 3640 3641 // GNU extension: arithmetic on pointer to void 3642 Diag(Loc, diag::ext_gnu_void_ptr) 3643 << lex->getSourceRange() << rex->getSourceRange(); 3644 } else if (PointeeTy->isFunctionType()) { 3645 if (getLangOptions().CPlusPlus) { 3646 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3647 << lex->getType() << lex->getSourceRange(); 3648 return QualType(); 3649 } 3650 3651 // GNU extension: arithmetic on pointer to function 3652 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3653 << lex->getType() << lex->getSourceRange(); 3654 } else if (!PTy->isDependentType() && 3655 RequireCompleteType(Loc, PointeeTy, 3656 diag::err_typecheck_arithmetic_incomplete_type, 3657 PExp->getSourceRange(), SourceRange(), 3658 PExp->getType())) 3659 return QualType(); 3660 3661 // Diagnose bad cases where we step over interface counts. 3662 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3663 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3664 << PointeeTy << PExp->getSourceRange(); 3665 return QualType(); 3666 } 3667 3668 if (CompLHSTy) { 3669 QualType LHSTy = lex->getType(); 3670 if (LHSTy->isPromotableIntegerType()) 3671 LHSTy = Context.IntTy; 3672 else { 3673 QualType T = isPromotableBitField(lex, Context); 3674 if (!T.isNull()) 3675 LHSTy = T; 3676 } 3677 3678 *CompLHSTy = LHSTy; 3679 } 3680 return PExp->getType(); 3681 } 3682 } 3683 3684 return InvalidOperands(Loc, lex, rex); 3685} 3686 3687// C99 6.5.6 3688QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3689 SourceLocation Loc, QualType* CompLHSTy) { 3690 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3691 QualType compType = CheckVectorOperands(Loc, lex, rex); 3692 if (CompLHSTy) *CompLHSTy = compType; 3693 return compType; 3694 } 3695 3696 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3697 3698 // Enforce type constraints: C99 6.5.6p3. 3699 3700 // Handle the common case first (both operands are arithmetic). 3701 if (lex->getType()->isArithmeticType() 3702 && rex->getType()->isArithmeticType()) { 3703 if (CompLHSTy) *CompLHSTy = compType; 3704 return compType; 3705 } 3706 3707 // Either ptr - int or ptr - ptr. 3708 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3709 QualType lpointee = LHSPTy->getPointeeType(); 3710 3711 // The LHS must be an completely-defined object type. 3712 3713 bool ComplainAboutVoid = false; 3714 Expr *ComplainAboutFunc = 0; 3715 if (lpointee->isVoidType()) { 3716 if (getLangOptions().CPlusPlus) { 3717 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3718 << lex->getSourceRange() << rex->getSourceRange(); 3719 return QualType(); 3720 } 3721 3722 // GNU C extension: arithmetic on pointer to void 3723 ComplainAboutVoid = true; 3724 } else if (lpointee->isFunctionType()) { 3725 if (getLangOptions().CPlusPlus) { 3726 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3727 << lex->getType() << lex->getSourceRange(); 3728 return QualType(); 3729 } 3730 3731 // GNU C extension: arithmetic on pointer to function 3732 ComplainAboutFunc = lex; 3733 } else if (!lpointee->isDependentType() && 3734 RequireCompleteType(Loc, lpointee, 3735 diag::err_typecheck_sub_ptr_object, 3736 lex->getSourceRange(), 3737 SourceRange(), 3738 lex->getType())) 3739 return QualType(); 3740 3741 // Diagnose bad cases where we step over interface counts. 3742 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3743 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3744 << lpointee << lex->getSourceRange(); 3745 return QualType(); 3746 } 3747 3748 // The result type of a pointer-int computation is the pointer type. 3749 if (rex->getType()->isIntegerType()) { 3750 if (ComplainAboutVoid) 3751 Diag(Loc, diag::ext_gnu_void_ptr) 3752 << lex->getSourceRange() << rex->getSourceRange(); 3753 if (ComplainAboutFunc) 3754 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3755 << ComplainAboutFunc->getType() 3756 << ComplainAboutFunc->getSourceRange(); 3757 3758 if (CompLHSTy) *CompLHSTy = lex->getType(); 3759 return lex->getType(); 3760 } 3761 3762 // Handle pointer-pointer subtractions. 3763 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3764 QualType rpointee = RHSPTy->getPointeeType(); 3765 3766 // RHS must be a completely-type object type. 3767 // Handle the GNU void* extension. 3768 if (rpointee->isVoidType()) { 3769 if (getLangOptions().CPlusPlus) { 3770 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3771 << lex->getSourceRange() << rex->getSourceRange(); 3772 return QualType(); 3773 } 3774 3775 ComplainAboutVoid = true; 3776 } else if (rpointee->isFunctionType()) { 3777 if (getLangOptions().CPlusPlus) { 3778 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3779 << rex->getType() << rex->getSourceRange(); 3780 return QualType(); 3781 } 3782 3783 // GNU extension: arithmetic on pointer to function 3784 if (!ComplainAboutFunc) 3785 ComplainAboutFunc = rex; 3786 } else if (!rpointee->isDependentType() && 3787 RequireCompleteType(Loc, rpointee, 3788 diag::err_typecheck_sub_ptr_object, 3789 rex->getSourceRange(), 3790 SourceRange(), 3791 rex->getType())) 3792 return QualType(); 3793 3794 if (getLangOptions().CPlusPlus) { 3795 // Pointee types must be the same: C++ [expr.add] 3796 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3797 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3798 << lex->getType() << rex->getType() 3799 << lex->getSourceRange() << rex->getSourceRange(); 3800 return QualType(); 3801 } 3802 } else { 3803 // Pointee types must be compatible C99 6.5.6p3 3804 if (!Context.typesAreCompatible( 3805 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3806 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3807 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3808 << lex->getType() << rex->getType() 3809 << lex->getSourceRange() << rex->getSourceRange(); 3810 return QualType(); 3811 } 3812 } 3813 3814 if (ComplainAboutVoid) 3815 Diag(Loc, diag::ext_gnu_void_ptr) 3816 << lex->getSourceRange() << rex->getSourceRange(); 3817 if (ComplainAboutFunc) 3818 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3819 << ComplainAboutFunc->getType() 3820 << ComplainAboutFunc->getSourceRange(); 3821 3822 if (CompLHSTy) *CompLHSTy = lex->getType(); 3823 return Context.getPointerDiffType(); 3824 } 3825 } 3826 3827 return InvalidOperands(Loc, lex, rex); 3828} 3829 3830// C99 6.5.7 3831QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3832 bool isCompAssign) { 3833 // C99 6.5.7p2: Each of the operands shall have integer type. 3834 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3835 return InvalidOperands(Loc, lex, rex); 3836 3837 // Shifts don't perform usual arithmetic conversions, they just do integer 3838 // promotions on each operand. C99 6.5.7p3 3839 QualType LHSTy; 3840 if (lex->getType()->isPromotableIntegerType()) 3841 LHSTy = Context.IntTy; 3842 else { 3843 LHSTy = isPromotableBitField(lex, Context); 3844 if (LHSTy.isNull()) 3845 LHSTy = lex->getType(); 3846 } 3847 if (!isCompAssign) 3848 ImpCastExprToType(lex, LHSTy); 3849 3850 UsualUnaryConversions(rex); 3851 3852 // "The type of the result is that of the promoted left operand." 3853 return LHSTy; 3854} 3855 3856// C99 6.5.8, C++ [expr.rel] 3857QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3858 unsigned OpaqueOpc, bool isRelational) { 3859 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3860 3861 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3862 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3863 3864 // C99 6.5.8p3 / C99 6.5.9p4 3865 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3866 UsualArithmeticConversions(lex, rex); 3867 else { 3868 UsualUnaryConversions(lex); 3869 UsualUnaryConversions(rex); 3870 } 3871 QualType lType = lex->getType(); 3872 QualType rType = rex->getType(); 3873 3874 if (!lType->isFloatingType() 3875 && !(lType->isBlockPointerType() && isRelational)) { 3876 // For non-floating point types, check for self-comparisons of the form 3877 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3878 // often indicate logic errors in the program. 3879 // NOTE: Don't warn about comparisons of enum constants. These can arise 3880 // from macro expansions, and are usually quite deliberate. 3881 Expr *LHSStripped = lex->IgnoreParens(); 3882 Expr *RHSStripped = rex->IgnoreParens(); 3883 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3884 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3885 if (DRL->getDecl() == DRR->getDecl() && 3886 !isa<EnumConstantDecl>(DRL->getDecl())) 3887 Diag(Loc, diag::warn_selfcomparison); 3888 3889 if (isa<CastExpr>(LHSStripped)) 3890 LHSStripped = LHSStripped->IgnoreParenCasts(); 3891 if (isa<CastExpr>(RHSStripped)) 3892 RHSStripped = RHSStripped->IgnoreParenCasts(); 3893 3894 // Warn about comparisons against a string constant (unless the other 3895 // operand is null), the user probably wants strcmp. 3896 Expr *literalString = 0; 3897 Expr *literalStringStripped = 0; 3898 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3899 !RHSStripped->isNullPointerConstant(Context)) { 3900 literalString = lex; 3901 literalStringStripped = LHSStripped; 3902 } 3903 else if ((isa<StringLiteral>(RHSStripped) || 3904 isa<ObjCEncodeExpr>(RHSStripped)) && 3905 !LHSStripped->isNullPointerConstant(Context)) { 3906 literalString = rex; 3907 literalStringStripped = RHSStripped; 3908 } 3909 3910 if (literalString) { 3911 std::string resultComparison; 3912 switch (Opc) { 3913 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3914 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3915 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3916 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3917 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3918 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3919 default: assert(false && "Invalid comparison operator"); 3920 } 3921 Diag(Loc, diag::warn_stringcompare) 3922 << isa<ObjCEncodeExpr>(literalStringStripped) 3923 << literalString->getSourceRange() 3924 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3925 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3926 "strcmp(") 3927 << CodeModificationHint::CreateInsertion( 3928 PP.getLocForEndOfToken(rex->getLocEnd()), 3929 resultComparison); 3930 } 3931 } 3932 3933 // The result of comparisons is 'bool' in C++, 'int' in C. 3934 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3935 3936 if (isRelational) { 3937 if (lType->isRealType() && rType->isRealType()) 3938 return ResultTy; 3939 } else { 3940 // Check for comparisons of floating point operands using != and ==. 3941 if (lType->isFloatingType()) { 3942 assert(rType->isFloatingType()); 3943 CheckFloatComparison(Loc,lex,rex); 3944 } 3945 3946 if (lType->isArithmeticType() && rType->isArithmeticType()) 3947 return ResultTy; 3948 } 3949 3950 bool LHSIsNull = lex->isNullPointerConstant(Context); 3951 bool RHSIsNull = rex->isNullPointerConstant(Context); 3952 3953 // All of the following pointer related warnings are GCC extensions, except 3954 // when handling null pointer constants. One day, we can consider making them 3955 // errors (when -pedantic-errors is enabled). 3956 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3957 QualType LCanPointeeTy = 3958 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3959 QualType RCanPointeeTy = 3960 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3961 3962 // Simple check: if the pointee types are identical, we're done. 3963 if (LCanPointeeTy == RCanPointeeTy) 3964 return ResultTy; 3965 3966 if (getLangOptions().CPlusPlus) { 3967 // C++ [expr.rel]p2: 3968 // [...] Pointer conversions (4.10) and qualification 3969 // conversions (4.4) are performed on pointer operands (or on 3970 // a pointer operand and a null pointer constant) to bring 3971 // them to their composite pointer type. [...] 3972 // 3973 // C++ [expr.eq]p2 uses the same notion for (in)equality 3974 // comparisons of pointers. 3975 QualType T = FindCompositePointerType(lex, rex); 3976 if (T.isNull()) { 3977 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 3978 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3979 return QualType(); 3980 } 3981 3982 ImpCastExprToType(lex, T); 3983 ImpCastExprToType(rex, T); 3984 return ResultTy; 3985 } 3986 3987 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3988 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3989 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3990 RCanPointeeTy.getUnqualifiedType()) && 3991 !Context.areComparableObjCPointerTypes(lType, rType)) { 3992 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3993 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3994 } 3995 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3996 return ResultTy; 3997 } 3998 // C++ allows comparison of pointers with null pointer constants. 3999 if (getLangOptions().CPlusPlus) { 4000 if (lType->isPointerType() && RHSIsNull) { 4001 ImpCastExprToType(rex, lType); 4002 return ResultTy; 4003 } 4004 if (rType->isPointerType() && LHSIsNull) { 4005 ImpCastExprToType(lex, rType); 4006 return ResultTy; 4007 } 4008 // And comparison of nullptr_t with itself. 4009 if (lType->isNullPtrType() && rType->isNullPtrType()) 4010 return ResultTy; 4011 } 4012 // Handle block pointer types. 4013 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4014 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4015 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4016 4017 if (!LHSIsNull && !RHSIsNull && 4018 !Context.typesAreCompatible(lpointee, rpointee)) { 4019 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4020 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4021 } 4022 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4023 return ResultTy; 4024 } 4025 // Allow block pointers to be compared with null pointer constants. 4026 if (!isRelational 4027 && ((lType->isBlockPointerType() && rType->isPointerType()) 4028 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4029 if (!LHSIsNull && !RHSIsNull) { 4030 if (!((rType->isPointerType() && rType->getAsPointerType() 4031 ->getPointeeType()->isVoidType()) 4032 || (lType->isPointerType() && lType->getAsPointerType() 4033 ->getPointeeType()->isVoidType()))) 4034 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4035 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4036 } 4037 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4038 return ResultTy; 4039 } 4040 4041 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4042 if (lType->isPointerType() || rType->isPointerType()) { 4043 const PointerType *LPT = lType->getAsPointerType(); 4044 const PointerType *RPT = rType->getAsPointerType(); 4045 bool LPtrToVoid = LPT ? 4046 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4047 bool RPtrToVoid = RPT ? 4048 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4049 4050 if (!LPtrToVoid && !RPtrToVoid && 4051 !Context.typesAreCompatible(lType, rType)) { 4052 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4053 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4054 ImpCastExprToType(rex, lType); 4055 return ResultTy; 4056 } 4057 ImpCastExprToType(rex, lType); 4058 return ResultTy; 4059 } 4060 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4061 ImpCastExprToType(rex, lType); 4062 return ResultTy; 4063 } else { 4064 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4065 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4066 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4067 ImpCastExprToType(rex, lType); 4068 return ResultTy; 4069 } 4070 } 4071 } 4072 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4073 rType->isIntegerType()) { 4074 if (!RHSIsNull) 4075 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4076 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4077 ImpCastExprToType(rex, lType); // promote the integer to pointer 4078 return ResultTy; 4079 } 4080 if (lType->isIntegerType() && 4081 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 4082 if (!LHSIsNull) 4083 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4084 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4085 ImpCastExprToType(lex, rType); // promote the integer to pointer 4086 return ResultTy; 4087 } 4088 // Handle block pointers. 4089 if (!isRelational && RHSIsNull 4090 && lType->isBlockPointerType() && rType->isIntegerType()) { 4091 ImpCastExprToType(rex, lType); // promote the integer to pointer 4092 return ResultTy; 4093 } 4094 if (!isRelational && LHSIsNull 4095 && lType->isIntegerType() && rType->isBlockPointerType()) { 4096 ImpCastExprToType(lex, rType); // promote the integer to pointer 4097 return ResultTy; 4098 } 4099 return InvalidOperands(Loc, lex, rex); 4100} 4101 4102/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4103/// operates on extended vector types. Instead of producing an IntTy result, 4104/// like a scalar comparison, a vector comparison produces a vector of integer 4105/// types. 4106QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4107 SourceLocation Loc, 4108 bool isRelational) { 4109 // Check to make sure we're operating on vectors of the same type and width, 4110 // Allowing one side to be a scalar of element type. 4111 QualType vType = CheckVectorOperands(Loc, lex, rex); 4112 if (vType.isNull()) 4113 return vType; 4114 4115 QualType lType = lex->getType(); 4116 QualType rType = rex->getType(); 4117 4118 // For non-floating point types, check for self-comparisons of the form 4119 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4120 // often indicate logic errors in the program. 4121 if (!lType->isFloatingType()) { 4122 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4123 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4124 if (DRL->getDecl() == DRR->getDecl()) 4125 Diag(Loc, diag::warn_selfcomparison); 4126 } 4127 4128 // Check for comparisons of floating point operands using != and ==. 4129 if (!isRelational && lType->isFloatingType()) { 4130 assert (rType->isFloatingType()); 4131 CheckFloatComparison(Loc,lex,rex); 4132 } 4133 4134 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4135 // just reject all vector comparisons for now. 4136 if (1) { 4137 Diag(Loc, diag::err_typecheck_vector_comparison) 4138 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4139 return QualType(); 4140 } 4141 4142 // Return the type for the comparison, which is the same as vector type for 4143 // integer vectors, or an integer type of identical size and number of 4144 // elements for floating point vectors. 4145 if (lType->isIntegerType()) 4146 return lType; 4147 4148 const VectorType *VTy = lType->getAsVectorType(); 4149 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4150 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4151 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4152 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4153 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4154 4155 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4156 "Unhandled vector element size in vector compare"); 4157 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4158} 4159 4160inline QualType Sema::CheckBitwiseOperands( 4161 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4162{ 4163 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4164 return CheckVectorOperands(Loc, lex, rex); 4165 4166 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4167 4168 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4169 return compType; 4170 return InvalidOperands(Loc, lex, rex); 4171} 4172 4173inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4174 Expr *&lex, Expr *&rex, SourceLocation Loc) 4175{ 4176 UsualUnaryConversions(lex); 4177 UsualUnaryConversions(rex); 4178 4179 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4180 return Context.IntTy; 4181 return InvalidOperands(Loc, lex, rex); 4182} 4183 4184/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4185/// is a read-only property; return true if so. A readonly property expression 4186/// depends on various declarations and thus must be treated specially. 4187/// 4188static bool IsReadonlyProperty(Expr *E, Sema &S) 4189{ 4190 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4191 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4192 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4193 QualType BaseType = PropExpr->getBase()->getType(); 4194 if (const PointerType *PTy = BaseType->getAsPointerType()) 4195 if (const ObjCInterfaceType *IFTy = 4196 PTy->getPointeeType()->getAsObjCInterfaceType()) 4197 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4198 if (S.isPropertyReadonly(PDecl, IFace)) 4199 return true; 4200 } 4201 } 4202 return false; 4203} 4204 4205/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4206/// emit an error and return true. If so, return false. 4207static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4208 SourceLocation OrigLoc = Loc; 4209 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4210 &Loc); 4211 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4212 IsLV = Expr::MLV_ReadonlyProperty; 4213 if (IsLV == Expr::MLV_Valid) 4214 return false; 4215 4216 unsigned Diag = 0; 4217 bool NeedType = false; 4218 switch (IsLV) { // C99 6.5.16p2 4219 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4220 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4221 case Expr::MLV_ArrayType: 4222 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4223 NeedType = true; 4224 break; 4225 case Expr::MLV_NotObjectType: 4226 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4227 NeedType = true; 4228 break; 4229 case Expr::MLV_LValueCast: 4230 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4231 break; 4232 case Expr::MLV_InvalidExpression: 4233 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4234 break; 4235 case Expr::MLV_IncompleteType: 4236 case Expr::MLV_IncompleteVoidType: 4237 return S.RequireCompleteType(Loc, E->getType(), 4238 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4239 E->getSourceRange()); 4240 case Expr::MLV_DuplicateVectorComponents: 4241 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4242 break; 4243 case Expr::MLV_NotBlockQualified: 4244 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4245 break; 4246 case Expr::MLV_ReadonlyProperty: 4247 Diag = diag::error_readonly_property_assignment; 4248 break; 4249 case Expr::MLV_NoSetterProperty: 4250 Diag = diag::error_nosetter_property_assignment; 4251 break; 4252 } 4253 4254 SourceRange Assign; 4255 if (Loc != OrigLoc) 4256 Assign = SourceRange(OrigLoc, OrigLoc); 4257 if (NeedType) 4258 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4259 else 4260 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4261 return true; 4262} 4263 4264 4265 4266// C99 6.5.16.1 4267QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4268 SourceLocation Loc, 4269 QualType CompoundType) { 4270 // Verify that LHS is a modifiable lvalue, and emit error if not. 4271 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4272 return QualType(); 4273 4274 QualType LHSType = LHS->getType(); 4275 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4276 4277 AssignConvertType ConvTy; 4278 if (CompoundType.isNull()) { 4279 // Simple assignment "x = y". 4280 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4281 // Special case of NSObject attributes on c-style pointer types. 4282 if (ConvTy == IncompatiblePointer && 4283 ((Context.isObjCNSObjectType(LHSType) && 4284 Context.isObjCObjectPointerType(RHSType)) || 4285 (Context.isObjCNSObjectType(RHSType) && 4286 Context.isObjCObjectPointerType(LHSType)))) 4287 ConvTy = Compatible; 4288 4289 // If the RHS is a unary plus or minus, check to see if they = and + are 4290 // right next to each other. If so, the user may have typo'd "x =+ 4" 4291 // instead of "x += 4". 4292 Expr *RHSCheck = RHS; 4293 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4294 RHSCheck = ICE->getSubExpr(); 4295 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4296 if ((UO->getOpcode() == UnaryOperator::Plus || 4297 UO->getOpcode() == UnaryOperator::Minus) && 4298 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4299 // Only if the two operators are exactly adjacent. 4300 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4301 // And there is a space or other character before the subexpr of the 4302 // unary +/-. We don't want to warn on "x=-1". 4303 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4304 UO->getSubExpr()->getLocStart().isFileID()) { 4305 Diag(Loc, diag::warn_not_compound_assign) 4306 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4307 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4308 } 4309 } 4310 } else { 4311 // Compound assignment "x += y" 4312 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4313 } 4314 4315 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4316 RHS, "assigning")) 4317 return QualType(); 4318 4319 // C99 6.5.16p3: The type of an assignment expression is the type of the 4320 // left operand unless the left operand has qualified type, in which case 4321 // it is the unqualified version of the type of the left operand. 4322 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4323 // is converted to the type of the assignment expression (above). 4324 // C++ 5.17p1: the type of the assignment expression is that of its left 4325 // operand. 4326 return LHSType.getUnqualifiedType(); 4327} 4328 4329// C99 6.5.17 4330QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4331 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4332 DefaultFunctionArrayConversion(RHS); 4333 4334 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4335 // incomplete in C++). 4336 4337 return RHS->getType(); 4338} 4339 4340/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4341/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4342QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4343 bool isInc) { 4344 if (Op->isTypeDependent()) 4345 return Context.DependentTy; 4346 4347 QualType ResType = Op->getType(); 4348 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4349 4350 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4351 // Decrement of bool is not allowed. 4352 if (!isInc) { 4353 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4354 return QualType(); 4355 } 4356 // Increment of bool sets it to true, but is deprecated. 4357 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4358 } else if (ResType->isRealType()) { 4359 // OK! 4360 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4361 // C99 6.5.2.4p2, 6.5.6p2 4362 if (PT->getPointeeType()->isVoidType()) { 4363 if (getLangOptions().CPlusPlus) { 4364 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4365 << Op->getSourceRange(); 4366 return QualType(); 4367 } 4368 4369 // Pointer to void is a GNU extension in C. 4370 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4371 } else if (PT->getPointeeType()->isFunctionType()) { 4372 if (getLangOptions().CPlusPlus) { 4373 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4374 << Op->getType() << Op->getSourceRange(); 4375 return QualType(); 4376 } 4377 4378 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4379 << ResType << Op->getSourceRange(); 4380 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4381 diag::err_typecheck_arithmetic_incomplete_type, 4382 Op->getSourceRange(), SourceRange(), 4383 ResType)) 4384 return QualType(); 4385 } else if (ResType->isComplexType()) { 4386 // C99 does not support ++/-- on complex types, we allow as an extension. 4387 Diag(OpLoc, diag::ext_integer_increment_complex) 4388 << ResType << Op->getSourceRange(); 4389 } else { 4390 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4391 << ResType << Op->getSourceRange(); 4392 return QualType(); 4393 } 4394 // At this point, we know we have a real, complex or pointer type. 4395 // Now make sure the operand is a modifiable lvalue. 4396 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4397 return QualType(); 4398 return ResType; 4399} 4400 4401/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4402/// This routine allows us to typecheck complex/recursive expressions 4403/// where the declaration is needed for type checking. We only need to 4404/// handle cases when the expression references a function designator 4405/// or is an lvalue. Here are some examples: 4406/// - &(x) => x 4407/// - &*****f => f for f a function designator. 4408/// - &s.xx => s 4409/// - &s.zz[1].yy -> s, if zz is an array 4410/// - *(x + 1) -> x, if x is an array 4411/// - &"123"[2] -> 0 4412/// - & __real__ x -> x 4413static NamedDecl *getPrimaryDecl(Expr *E) { 4414 switch (E->getStmtClass()) { 4415 case Stmt::DeclRefExprClass: 4416 case Stmt::QualifiedDeclRefExprClass: 4417 return cast<DeclRefExpr>(E)->getDecl(); 4418 case Stmt::MemberExprClass: 4419 // If this is an arrow operator, the address is an offset from 4420 // the base's value, so the object the base refers to is 4421 // irrelevant. 4422 if (cast<MemberExpr>(E)->isArrow()) 4423 return 0; 4424 // Otherwise, the expression refers to a part of the base 4425 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4426 case Stmt::ArraySubscriptExprClass: { 4427 // FIXME: This code shouldn't be necessary! We should catch the implicit 4428 // promotion of register arrays earlier. 4429 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4430 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4431 if (ICE->getSubExpr()->getType()->isArrayType()) 4432 return getPrimaryDecl(ICE->getSubExpr()); 4433 } 4434 return 0; 4435 } 4436 case Stmt::UnaryOperatorClass: { 4437 UnaryOperator *UO = cast<UnaryOperator>(E); 4438 4439 switch(UO->getOpcode()) { 4440 case UnaryOperator::Real: 4441 case UnaryOperator::Imag: 4442 case UnaryOperator::Extension: 4443 return getPrimaryDecl(UO->getSubExpr()); 4444 default: 4445 return 0; 4446 } 4447 } 4448 case Stmt::ParenExprClass: 4449 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4450 case Stmt::ImplicitCastExprClass: 4451 // If the result of an implicit cast is an l-value, we care about 4452 // the sub-expression; otherwise, the result here doesn't matter. 4453 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4454 default: 4455 return 0; 4456 } 4457} 4458 4459/// CheckAddressOfOperand - The operand of & must be either a function 4460/// designator or an lvalue designating an object. If it is an lvalue, the 4461/// object cannot be declared with storage class register or be a bit field. 4462/// Note: The usual conversions are *not* applied to the operand of the & 4463/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4464/// In C++, the operand might be an overloaded function name, in which case 4465/// we allow the '&' but retain the overloaded-function type. 4466QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4467 // Make sure to ignore parentheses in subsequent checks 4468 op = op->IgnoreParens(); 4469 4470 if (op->isTypeDependent()) 4471 return Context.DependentTy; 4472 4473 if (getLangOptions().C99) { 4474 // Implement C99-only parts of addressof rules. 4475 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4476 if (uOp->getOpcode() == UnaryOperator::Deref) 4477 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4478 // (assuming the deref expression is valid). 4479 return uOp->getSubExpr()->getType(); 4480 } 4481 // Technically, there should be a check for array subscript 4482 // expressions here, but the result of one is always an lvalue anyway. 4483 } 4484 NamedDecl *dcl = getPrimaryDecl(op); 4485 Expr::isLvalueResult lval = op->isLvalue(Context); 4486 4487 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4488 // C99 6.5.3.2p1 4489 // The operand must be either an l-value or a function designator 4490 if (!op->getType()->isFunctionType()) { 4491 // FIXME: emit more specific diag... 4492 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4493 << op->getSourceRange(); 4494 return QualType(); 4495 } 4496 } else if (op->getBitField()) { // C99 6.5.3.2p1 4497 // The operand cannot be a bit-field 4498 Diag(OpLoc, diag::err_typecheck_address_of) 4499 << "bit-field" << op->getSourceRange(); 4500 return QualType(); 4501 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4502 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4503 // The operand cannot be an element of a vector 4504 Diag(OpLoc, diag::err_typecheck_address_of) 4505 << "vector element" << op->getSourceRange(); 4506 return QualType(); 4507 } else if (dcl) { // C99 6.5.3.2p1 4508 // We have an lvalue with a decl. Make sure the decl is not declared 4509 // with the register storage-class specifier. 4510 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4511 if (vd->getStorageClass() == VarDecl::Register) { 4512 Diag(OpLoc, diag::err_typecheck_address_of) 4513 << "register variable" << op->getSourceRange(); 4514 return QualType(); 4515 } 4516 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4517 return Context.OverloadTy; 4518 } else if (isa<FieldDecl>(dcl)) { 4519 // Okay: we can take the address of a field. 4520 // Could be a pointer to member, though, if there is an explicit 4521 // scope qualifier for the class. 4522 if (isa<QualifiedDeclRefExpr>(op)) { 4523 DeclContext *Ctx = dcl->getDeclContext(); 4524 if (Ctx && Ctx->isRecord()) 4525 return Context.getMemberPointerType(op->getType(), 4526 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4527 } 4528 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4529 // Okay: we can take the address of a function. 4530 // As above. 4531 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4532 return Context.getMemberPointerType(op->getType(), 4533 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4534 } else if (!isa<FunctionDecl>(dcl)) 4535 assert(0 && "Unknown/unexpected decl type"); 4536 } 4537 4538 if (lval == Expr::LV_IncompleteVoidType) { 4539 // Taking the address of a void variable is technically illegal, but we 4540 // allow it in cases which are otherwise valid. 4541 // Example: "extern void x; void* y = &x;". 4542 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4543 } 4544 4545 // If the operand has type "type", the result has type "pointer to type". 4546 return Context.getPointerType(op->getType()); 4547} 4548 4549QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4550 if (Op->isTypeDependent()) 4551 return Context.DependentTy; 4552 4553 UsualUnaryConversions(Op); 4554 QualType Ty = Op->getType(); 4555 4556 // Note that per both C89 and C99, this is always legal, even if ptype is an 4557 // incomplete type or void. It would be possible to warn about dereferencing 4558 // a void pointer, but it's completely well-defined, and such a warning is 4559 // unlikely to catch any mistakes. 4560 if (const PointerType *PT = Ty->getAsPointerType()) 4561 return PT->getPointeeType(); 4562 4563 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4564 << Ty << Op->getSourceRange(); 4565 return QualType(); 4566} 4567 4568static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4569 tok::TokenKind Kind) { 4570 BinaryOperator::Opcode Opc; 4571 switch (Kind) { 4572 default: assert(0 && "Unknown binop!"); 4573 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4574 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4575 case tok::star: Opc = BinaryOperator::Mul; break; 4576 case tok::slash: Opc = BinaryOperator::Div; break; 4577 case tok::percent: Opc = BinaryOperator::Rem; break; 4578 case tok::plus: Opc = BinaryOperator::Add; break; 4579 case tok::minus: Opc = BinaryOperator::Sub; break; 4580 case tok::lessless: Opc = BinaryOperator::Shl; break; 4581 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4582 case tok::lessequal: Opc = BinaryOperator::LE; break; 4583 case tok::less: Opc = BinaryOperator::LT; break; 4584 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4585 case tok::greater: Opc = BinaryOperator::GT; break; 4586 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4587 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4588 case tok::amp: Opc = BinaryOperator::And; break; 4589 case tok::caret: Opc = BinaryOperator::Xor; break; 4590 case tok::pipe: Opc = BinaryOperator::Or; break; 4591 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4592 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4593 case tok::equal: Opc = BinaryOperator::Assign; break; 4594 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4595 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4596 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4597 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4598 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4599 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4600 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4601 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4602 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4603 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4604 case tok::comma: Opc = BinaryOperator::Comma; break; 4605 } 4606 return Opc; 4607} 4608 4609static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4610 tok::TokenKind Kind) { 4611 UnaryOperator::Opcode Opc; 4612 switch (Kind) { 4613 default: assert(0 && "Unknown unary op!"); 4614 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4615 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4616 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4617 case tok::star: Opc = UnaryOperator::Deref; break; 4618 case tok::plus: Opc = UnaryOperator::Plus; break; 4619 case tok::minus: Opc = UnaryOperator::Minus; break; 4620 case tok::tilde: Opc = UnaryOperator::Not; break; 4621 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4622 case tok::kw___real: Opc = UnaryOperator::Real; break; 4623 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4624 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4625 } 4626 return Opc; 4627} 4628 4629/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4630/// operator @p Opc at location @c TokLoc. This routine only supports 4631/// built-in operations; ActOnBinOp handles overloaded operators. 4632Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4633 unsigned Op, 4634 Expr *lhs, Expr *rhs) { 4635 QualType ResultTy; // Result type of the binary operator. 4636 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4637 // The following two variables are used for compound assignment operators 4638 QualType CompLHSTy; // Type of LHS after promotions for computation 4639 QualType CompResultTy; // Type of computation result 4640 4641 switch (Opc) { 4642 case BinaryOperator::Assign: 4643 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4644 break; 4645 case BinaryOperator::PtrMemD: 4646 case BinaryOperator::PtrMemI: 4647 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4648 Opc == BinaryOperator::PtrMemI); 4649 break; 4650 case BinaryOperator::Mul: 4651 case BinaryOperator::Div: 4652 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4653 break; 4654 case BinaryOperator::Rem: 4655 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4656 break; 4657 case BinaryOperator::Add: 4658 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4659 break; 4660 case BinaryOperator::Sub: 4661 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4662 break; 4663 case BinaryOperator::Shl: 4664 case BinaryOperator::Shr: 4665 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4666 break; 4667 case BinaryOperator::LE: 4668 case BinaryOperator::LT: 4669 case BinaryOperator::GE: 4670 case BinaryOperator::GT: 4671 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4672 break; 4673 case BinaryOperator::EQ: 4674 case BinaryOperator::NE: 4675 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4676 break; 4677 case BinaryOperator::And: 4678 case BinaryOperator::Xor: 4679 case BinaryOperator::Or: 4680 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4681 break; 4682 case BinaryOperator::LAnd: 4683 case BinaryOperator::LOr: 4684 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4685 break; 4686 case BinaryOperator::MulAssign: 4687 case BinaryOperator::DivAssign: 4688 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4689 CompLHSTy = CompResultTy; 4690 if (!CompResultTy.isNull()) 4691 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4692 break; 4693 case BinaryOperator::RemAssign: 4694 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4695 CompLHSTy = CompResultTy; 4696 if (!CompResultTy.isNull()) 4697 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4698 break; 4699 case BinaryOperator::AddAssign: 4700 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4701 if (!CompResultTy.isNull()) 4702 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4703 break; 4704 case BinaryOperator::SubAssign: 4705 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4706 if (!CompResultTy.isNull()) 4707 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4708 break; 4709 case BinaryOperator::ShlAssign: 4710 case BinaryOperator::ShrAssign: 4711 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4712 CompLHSTy = CompResultTy; 4713 if (!CompResultTy.isNull()) 4714 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4715 break; 4716 case BinaryOperator::AndAssign: 4717 case BinaryOperator::XorAssign: 4718 case BinaryOperator::OrAssign: 4719 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4720 CompLHSTy = CompResultTy; 4721 if (!CompResultTy.isNull()) 4722 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4723 break; 4724 case BinaryOperator::Comma: 4725 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4726 break; 4727 } 4728 if (ResultTy.isNull()) 4729 return ExprError(); 4730 if (CompResultTy.isNull()) 4731 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4732 else 4733 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4734 CompLHSTy, CompResultTy, 4735 OpLoc)); 4736} 4737 4738// Binary Operators. 'Tok' is the token for the operator. 4739Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4740 tok::TokenKind Kind, 4741 ExprArg LHS, ExprArg RHS) { 4742 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4743 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4744 4745 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4746 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4747 4748 if (getLangOptions().CPlusPlus && 4749 (lhs->getType()->isOverloadableType() || 4750 rhs->getType()->isOverloadableType())) { 4751 // Find all of the overloaded operators visible from this 4752 // point. We perform both an operator-name lookup from the local 4753 // scope and an argument-dependent lookup based on the types of 4754 // the arguments. 4755 FunctionSet Functions; 4756 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4757 if (OverOp != OO_None) { 4758 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4759 Functions); 4760 Expr *Args[2] = { lhs, rhs }; 4761 DeclarationName OpName 4762 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4763 ArgumentDependentLookup(OpName, Args, 2, Functions); 4764 } 4765 4766 // Build the (potentially-overloaded, potentially-dependent) 4767 // binary operation. 4768 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4769 } 4770 4771 // Build a built-in binary operation. 4772 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4773} 4774 4775Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4776 unsigned OpcIn, 4777 ExprArg InputArg) { 4778 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4779 4780 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4781 Expr *Input = (Expr *)InputArg.get(); 4782 QualType resultType; 4783 switch (Opc) { 4784 case UnaryOperator::PostInc: 4785 case UnaryOperator::PostDec: 4786 case UnaryOperator::OffsetOf: 4787 assert(false && "Invalid unary operator"); 4788 break; 4789 4790 case UnaryOperator::PreInc: 4791 case UnaryOperator::PreDec: 4792 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4793 Opc == UnaryOperator::PreInc); 4794 break; 4795 case UnaryOperator::AddrOf: 4796 resultType = CheckAddressOfOperand(Input, OpLoc); 4797 break; 4798 case UnaryOperator::Deref: 4799 DefaultFunctionArrayConversion(Input); 4800 resultType = CheckIndirectionOperand(Input, OpLoc); 4801 break; 4802 case UnaryOperator::Plus: 4803 case UnaryOperator::Minus: 4804 UsualUnaryConversions(Input); 4805 resultType = Input->getType(); 4806 if (resultType->isDependentType()) 4807 break; 4808 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4809 break; 4810 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4811 resultType->isEnumeralType()) 4812 break; 4813 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4814 Opc == UnaryOperator::Plus && 4815 resultType->isPointerType()) 4816 break; 4817 4818 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4819 << resultType << Input->getSourceRange()); 4820 case UnaryOperator::Not: // bitwise complement 4821 UsualUnaryConversions(Input); 4822 resultType = Input->getType(); 4823 if (resultType->isDependentType()) 4824 break; 4825 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4826 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4827 // C99 does not support '~' for complex conjugation. 4828 Diag(OpLoc, diag::ext_integer_complement_complex) 4829 << resultType << Input->getSourceRange(); 4830 else if (!resultType->isIntegerType()) 4831 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4832 << resultType << Input->getSourceRange()); 4833 break; 4834 case UnaryOperator::LNot: // logical negation 4835 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4836 DefaultFunctionArrayConversion(Input); 4837 resultType = Input->getType(); 4838 if (resultType->isDependentType()) 4839 break; 4840 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4841 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4842 << resultType << Input->getSourceRange()); 4843 // LNot always has type int. C99 6.5.3.3p5. 4844 // In C++, it's bool. C++ 5.3.1p8 4845 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4846 break; 4847 case UnaryOperator::Real: 4848 case UnaryOperator::Imag: 4849 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4850 break; 4851 case UnaryOperator::Extension: 4852 resultType = Input->getType(); 4853 break; 4854 } 4855 if (resultType.isNull()) 4856 return ExprError(); 4857 4858 InputArg.release(); 4859 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4860} 4861 4862// Unary Operators. 'Tok' is the token for the operator. 4863Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4864 tok::TokenKind Op, ExprArg input) { 4865 Expr *Input = (Expr*)input.get(); 4866 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4867 4868 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4869 // Find all of the overloaded operators visible from this 4870 // point. We perform both an operator-name lookup from the local 4871 // scope and an argument-dependent lookup based on the types of 4872 // the arguments. 4873 FunctionSet Functions; 4874 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4875 if (OverOp != OO_None) { 4876 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4877 Functions); 4878 DeclarationName OpName 4879 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4880 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4881 } 4882 4883 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4884 } 4885 4886 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4887} 4888 4889/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4890Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4891 SourceLocation LabLoc, 4892 IdentifierInfo *LabelII) { 4893 // Look up the record for this label identifier. 4894 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4895 4896 // If we haven't seen this label yet, create a forward reference. It 4897 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4898 if (LabelDecl == 0) 4899 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4900 4901 // Create the AST node. The address of a label always has type 'void*'. 4902 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4903 Context.getPointerType(Context.VoidTy))); 4904} 4905 4906Sema::OwningExprResult 4907Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4908 SourceLocation RPLoc) { // "({..})" 4909 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4910 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4911 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4912 4913 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4914 if (isFileScope) 4915 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4916 4917 // FIXME: there are a variety of strange constraints to enforce here, for 4918 // example, it is not possible to goto into a stmt expression apparently. 4919 // More semantic analysis is needed. 4920 4921 // If there are sub stmts in the compound stmt, take the type of the last one 4922 // as the type of the stmtexpr. 4923 QualType Ty = Context.VoidTy; 4924 4925 if (!Compound->body_empty()) { 4926 Stmt *LastStmt = Compound->body_back(); 4927 // If LastStmt is a label, skip down through into the body. 4928 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4929 LastStmt = Label->getSubStmt(); 4930 4931 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4932 Ty = LastExpr->getType(); 4933 } 4934 4935 // FIXME: Check that expression type is complete/non-abstract; statement 4936 // expressions are not lvalues. 4937 4938 substmt.release(); 4939 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4940} 4941 4942Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4943 SourceLocation BuiltinLoc, 4944 SourceLocation TypeLoc, 4945 TypeTy *argty, 4946 OffsetOfComponent *CompPtr, 4947 unsigned NumComponents, 4948 SourceLocation RPLoc) { 4949 // FIXME: This function leaks all expressions in the offset components on 4950 // error. 4951 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4952 assert(!ArgTy.isNull() && "Missing type argument!"); 4953 4954 bool Dependent = ArgTy->isDependentType(); 4955 4956 // We must have at least one component that refers to the type, and the first 4957 // one is known to be a field designator. Verify that the ArgTy represents 4958 // a struct/union/class. 4959 if (!Dependent && !ArgTy->isRecordType()) 4960 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4961 4962 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4963 // with an incomplete type would be illegal. 4964 4965 // Otherwise, create a null pointer as the base, and iteratively process 4966 // the offsetof designators. 4967 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4968 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4969 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4970 ArgTy, SourceLocation()); 4971 4972 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4973 // GCC extension, diagnose them. 4974 // FIXME: This diagnostic isn't actually visible because the location is in 4975 // a system header! 4976 if (NumComponents != 1) 4977 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4978 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4979 4980 if (!Dependent) { 4981 bool DidWarnAboutNonPOD = false; 4982 4983 // FIXME: Dependent case loses a lot of information here. And probably 4984 // leaks like a sieve. 4985 for (unsigned i = 0; i != NumComponents; ++i) { 4986 const OffsetOfComponent &OC = CompPtr[i]; 4987 if (OC.isBrackets) { 4988 // Offset of an array sub-field. TODO: Should we allow vector elements? 4989 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4990 if (!AT) { 4991 Res->Destroy(Context); 4992 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4993 << Res->getType()); 4994 } 4995 4996 // FIXME: C++: Verify that operator[] isn't overloaded. 4997 4998 // Promote the array so it looks more like a normal array subscript 4999 // expression. 5000 DefaultFunctionArrayConversion(Res); 5001 5002 // C99 6.5.2.1p1 5003 Expr *Idx = static_cast<Expr*>(OC.U.E); 5004 // FIXME: Leaks Res 5005 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5006 return ExprError(Diag(Idx->getLocStart(), 5007 diag::err_typecheck_subscript_not_integer) 5008 << Idx->getSourceRange()); 5009 5010 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5011 OC.LocEnd); 5012 continue; 5013 } 5014 5015 const RecordType *RC = Res->getType()->getAsRecordType(); 5016 if (!RC) { 5017 Res->Destroy(Context); 5018 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5019 << Res->getType()); 5020 } 5021 5022 // Get the decl corresponding to this. 5023 RecordDecl *RD = RC->getDecl(); 5024 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5025 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5026 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5027 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5028 << Res->getType()); 5029 DidWarnAboutNonPOD = true; 5030 } 5031 } 5032 5033 FieldDecl *MemberDecl 5034 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5035 LookupMemberName) 5036 .getAsDecl()); 5037 // FIXME: Leaks Res 5038 if (!MemberDecl) 5039 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5040 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5041 5042 // FIXME: C++: Verify that MemberDecl isn't a static field. 5043 // FIXME: Verify that MemberDecl isn't a bitfield. 5044 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5045 Res = BuildAnonymousStructUnionMemberReference( 5046 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5047 } else { 5048 // MemberDecl->getType() doesn't get the right qualifiers, but it 5049 // doesn't matter here. 5050 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5051 MemberDecl->getType().getNonReferenceType()); 5052 } 5053 } 5054 } 5055 5056 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5057 Context.getSizeType(), BuiltinLoc)); 5058} 5059 5060 5061Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5062 TypeTy *arg1,TypeTy *arg2, 5063 SourceLocation RPLoc) { 5064 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5065 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5066 5067 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5068 5069 if (getLangOptions().CPlusPlus) { 5070 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5071 << SourceRange(BuiltinLoc, RPLoc); 5072 return ExprError(); 5073 } 5074 5075 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5076 argT1, argT2, RPLoc)); 5077} 5078 5079Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5080 ExprArg cond, 5081 ExprArg expr1, ExprArg expr2, 5082 SourceLocation RPLoc) { 5083 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5084 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5085 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5086 5087 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5088 5089 QualType resType; 5090 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5091 resType = Context.DependentTy; 5092 } else { 5093 // The conditional expression is required to be a constant expression. 5094 llvm::APSInt condEval(32); 5095 SourceLocation ExpLoc; 5096 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5097 return ExprError(Diag(ExpLoc, 5098 diag::err_typecheck_choose_expr_requires_constant) 5099 << CondExpr->getSourceRange()); 5100 5101 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5102 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5103 } 5104 5105 cond.release(); expr1.release(); expr2.release(); 5106 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5107 resType, RPLoc)); 5108} 5109 5110//===----------------------------------------------------------------------===// 5111// Clang Extensions. 5112//===----------------------------------------------------------------------===// 5113 5114/// ActOnBlockStart - This callback is invoked when a block literal is started. 5115void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5116 // Analyze block parameters. 5117 BlockSemaInfo *BSI = new BlockSemaInfo(); 5118 5119 // Add BSI to CurBlock. 5120 BSI->PrevBlockInfo = CurBlock; 5121 CurBlock = BSI; 5122 5123 BSI->ReturnType = QualType(); 5124 BSI->TheScope = BlockScope; 5125 BSI->hasBlockDeclRefExprs = false; 5126 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5127 CurFunctionNeedsScopeChecking = false; 5128 5129 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5130 PushDeclContext(BlockScope, BSI->TheDecl); 5131} 5132 5133void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5134 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5135 5136 if (ParamInfo.getNumTypeObjects() == 0 5137 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5138 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5139 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5140 5141 if (T->isArrayType()) { 5142 Diag(ParamInfo.getSourceRange().getBegin(), 5143 diag::err_block_returns_array); 5144 return; 5145 } 5146 5147 // The parameter list is optional, if there was none, assume (). 5148 if (!T->isFunctionType()) 5149 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5150 5151 CurBlock->hasPrototype = true; 5152 CurBlock->isVariadic = false; 5153 // Check for a valid sentinel attribute on this block. 5154 if (CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5155 Diag(ParamInfo.getAttributes()->getLoc(), 5156 diag::warn_attribute_sentinel_not_variadic) << 1; 5157 // FIXME: remove the attribute. 5158 } 5159 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5160 5161 // Do not allow returning a objc interface by-value. 5162 if (RetTy->isObjCInterfaceType()) { 5163 Diag(ParamInfo.getSourceRange().getBegin(), 5164 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5165 return; 5166 } 5167 return; 5168 } 5169 5170 // Analyze arguments to block. 5171 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5172 "Not a function declarator!"); 5173 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5174 5175 CurBlock->hasPrototype = FTI.hasPrototype; 5176 CurBlock->isVariadic = true; 5177 5178 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5179 // no arguments, not a function that takes a single void argument. 5180 if (FTI.hasPrototype && 5181 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5182 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5183 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5184 // empty arg list, don't push any params. 5185 CurBlock->isVariadic = false; 5186 } else if (FTI.hasPrototype) { 5187 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5188 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5189 CurBlock->isVariadic = FTI.isVariadic; 5190 } 5191 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5192 CurBlock->Params.size()); 5193 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5194 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5195 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5196 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5197 // If this has an identifier, add it to the scope stack. 5198 if ((*AI)->getIdentifier()) 5199 PushOnScopeChains(*AI, CurBlock->TheScope); 5200 5201 // Check for a valid sentinel attribute on this block. 5202 if (!CurBlock->isVariadic && 5203 CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5204 Diag(ParamInfo.getAttributes()->getLoc(), 5205 diag::warn_attribute_sentinel_not_variadic) << 1; 5206 // FIXME: remove the attribute. 5207 } 5208 5209 // Analyze the return type. 5210 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5211 QualType RetTy = T->getAsFunctionType()->getResultType(); 5212 5213 // Do not allow returning a objc interface by-value. 5214 if (RetTy->isObjCInterfaceType()) { 5215 Diag(ParamInfo.getSourceRange().getBegin(), 5216 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5217 } else if (!RetTy->isDependentType()) 5218 CurBlock->ReturnType = RetTy; 5219} 5220 5221/// ActOnBlockError - If there is an error parsing a block, this callback 5222/// is invoked to pop the information about the block from the action impl. 5223void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5224 // Ensure that CurBlock is deleted. 5225 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5226 5227 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5228 5229 // Pop off CurBlock, handle nested blocks. 5230 PopDeclContext(); 5231 CurBlock = CurBlock->PrevBlockInfo; 5232 // FIXME: Delete the ParmVarDecl objects as well??? 5233} 5234 5235/// ActOnBlockStmtExpr - This is called when the body of a block statement 5236/// literal was successfully completed. ^(int x){...} 5237Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5238 StmtArg body, Scope *CurScope) { 5239 // If blocks are disabled, emit an error. 5240 if (!LangOpts.Blocks) 5241 Diag(CaretLoc, diag::err_blocks_disable); 5242 5243 // Ensure that CurBlock is deleted. 5244 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5245 5246 PopDeclContext(); 5247 5248 // Pop off CurBlock, handle nested blocks. 5249 CurBlock = CurBlock->PrevBlockInfo; 5250 5251 QualType RetTy = Context.VoidTy; 5252 if (!BSI->ReturnType.isNull()) 5253 RetTy = BSI->ReturnType; 5254 5255 llvm::SmallVector<QualType, 8> ArgTypes; 5256 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5257 ArgTypes.push_back(BSI->Params[i]->getType()); 5258 5259 QualType BlockTy; 5260 if (!BSI->hasPrototype) 5261 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5262 else 5263 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5264 BSI->isVariadic, 0); 5265 5266 // FIXME: Check that return/parameter types are complete/non-abstract 5267 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5268 BlockTy = Context.getBlockPointerType(BlockTy); 5269 5270 // If needed, diagnose invalid gotos and switches in the block. 5271 if (CurFunctionNeedsScopeChecking) 5272 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5273 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5274 5275 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5276 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5277 BSI->hasBlockDeclRefExprs)); 5278} 5279 5280Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5281 ExprArg expr, TypeTy *type, 5282 SourceLocation RPLoc) { 5283 QualType T = QualType::getFromOpaquePtr(type); 5284 Expr *E = static_cast<Expr*>(expr.get()); 5285 Expr *OrigExpr = E; 5286 5287 InitBuiltinVaListType(); 5288 5289 // Get the va_list type 5290 QualType VaListType = Context.getBuiltinVaListType(); 5291 if (VaListType->isArrayType()) { 5292 // Deal with implicit array decay; for example, on x86-64, 5293 // va_list is an array, but it's supposed to decay to 5294 // a pointer for va_arg. 5295 VaListType = Context.getArrayDecayedType(VaListType); 5296 // Make sure the input expression also decays appropriately. 5297 UsualUnaryConversions(E); 5298 } else { 5299 // Otherwise, the va_list argument must be an l-value because 5300 // it is modified by va_arg. 5301 if (!E->isTypeDependent() && 5302 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5303 return ExprError(); 5304 } 5305 5306 if (!E->isTypeDependent() && 5307 !Context.hasSameType(VaListType, E->getType())) { 5308 return ExprError(Diag(E->getLocStart(), 5309 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5310 << OrigExpr->getType() << E->getSourceRange()); 5311 } 5312 5313 // FIXME: Check that type is complete/non-abstract 5314 // FIXME: Warn if a non-POD type is passed in. 5315 5316 expr.release(); 5317 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5318 RPLoc)); 5319} 5320 5321Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5322 // The type of __null will be int or long, depending on the size of 5323 // pointers on the target. 5324 QualType Ty; 5325 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5326 Ty = Context.IntTy; 5327 else 5328 Ty = Context.LongTy; 5329 5330 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5331} 5332 5333bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5334 SourceLocation Loc, 5335 QualType DstType, QualType SrcType, 5336 Expr *SrcExpr, const char *Flavor) { 5337 // Decode the result (notice that AST's are still created for extensions). 5338 bool isInvalid = false; 5339 unsigned DiagKind; 5340 switch (ConvTy) { 5341 default: assert(0 && "Unknown conversion type"); 5342 case Compatible: return false; 5343 case PointerToInt: 5344 DiagKind = diag::ext_typecheck_convert_pointer_int; 5345 break; 5346 case IntToPointer: 5347 DiagKind = diag::ext_typecheck_convert_int_pointer; 5348 break; 5349 case IncompatiblePointer: 5350 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5351 break; 5352 case IncompatiblePointerSign: 5353 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5354 break; 5355 case FunctionVoidPointer: 5356 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5357 break; 5358 case CompatiblePointerDiscardsQualifiers: 5359 // If the qualifiers lost were because we were applying the 5360 // (deprecated) C++ conversion from a string literal to a char* 5361 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5362 // Ideally, this check would be performed in 5363 // CheckPointerTypesForAssignment. However, that would require a 5364 // bit of refactoring (so that the second argument is an 5365 // expression, rather than a type), which should be done as part 5366 // of a larger effort to fix CheckPointerTypesForAssignment for 5367 // C++ semantics. 5368 if (getLangOptions().CPlusPlus && 5369 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5370 return false; 5371 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5372 break; 5373 case IntToBlockPointer: 5374 DiagKind = diag::err_int_to_block_pointer; 5375 break; 5376 case IncompatibleBlockPointer: 5377 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5378 break; 5379 case IncompatibleObjCQualifiedId: 5380 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5381 // it can give a more specific diagnostic. 5382 DiagKind = diag::warn_incompatible_qualified_id; 5383 break; 5384 case IncompatibleVectors: 5385 DiagKind = diag::warn_incompatible_vectors; 5386 break; 5387 case Incompatible: 5388 DiagKind = diag::err_typecheck_convert_incompatible; 5389 isInvalid = true; 5390 break; 5391 } 5392 5393 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5394 << SrcExpr->getSourceRange(); 5395 return isInvalid; 5396} 5397 5398bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5399 llvm::APSInt ICEResult; 5400 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5401 if (Result) 5402 *Result = ICEResult; 5403 return false; 5404 } 5405 5406 Expr::EvalResult EvalResult; 5407 5408 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5409 EvalResult.HasSideEffects) { 5410 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5411 5412 if (EvalResult.Diag) { 5413 // We only show the note if it's not the usual "invalid subexpression" 5414 // or if it's actually in a subexpression. 5415 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5416 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5417 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5418 } 5419 5420 return true; 5421 } 5422 5423 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5424 E->getSourceRange(); 5425 5426 if (EvalResult.Diag && 5427 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5428 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5429 5430 if (Result) 5431 *Result = EvalResult.Val.getInt(); 5432 return false; 5433} 5434 5435 5436/// \brief Note that the given declaration was referenced in the source code. 5437/// 5438/// This routine should be invoke whenever a given declaration is referenced 5439/// in the source code, and where that reference occurred. If this declaration 5440/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5441/// C99 6.9p3), then the declaration will be marked as used. 5442/// 5443/// \param Loc the location where the declaration was referenced. 5444/// 5445/// \param D the declaration that has been referenced by the source code. 5446void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5447 assert(D && "No declaration?"); 5448 5449 // Mark a parameter declaration "used", regardless of whether we're in a 5450 // template or not. 5451 if (isa<ParmVarDecl>(D)) 5452 D->setUsed(true); 5453 5454 // Do not mark anything as "used" within a dependent context; wait for 5455 // an instantiation. 5456 if (CurContext->isDependentContext()) 5457 return; 5458 5459 // If we are in an unevaluated operand, don't mark any definitions as used. 5460 if (InUnevaluatedOperand) 5461 return; 5462 5463 // Note that this declaration has been used. 5464 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5465 // FIXME: implicit template instantiation 5466 // FIXME: keep track of references to static functions 5467 (void)Function; 5468 Function->setUsed(true); 5469 return; 5470 } 5471 5472 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5473 (void)Var; 5474 // FIXME: implicit template instantiation 5475 // FIXME: keep track of references to static data? 5476 D->setUsed(true); 5477 } 5478} 5479 5480