SemaExpr.cpp revision ecce1314380e740bbe303cc68bf8f6b57480b09a
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. 626Sema::OwningExprResult 627Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 628 bool TypeDependent, bool ValueDependent, 629 const CXXScopeSpec *SS) { 630 631 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 632 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 633 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 634 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 635 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 636 << D->getIdentifier() << FD->getDeclName(); 637 Diag(D->getLocation(), diag::note_local_variable_declared_here) 638 << D->getIdentifier(); 639 return ExprError(); 640 } 641 } 642 } 643 } 644 645 MarkDeclarationReferenced(Loc, D); 646 647 Expr *E; 648 if (SS && !SS->isEmpty()) { 649 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 650 ValueDependent, SS->getRange(), 651 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 652 } else 653 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 654 655 return Owned(E); 656} 657 658/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 659/// variable corresponding to the anonymous union or struct whose type 660/// is Record. 661static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 662 RecordDecl *Record) { 663 assert(Record->isAnonymousStructOrUnion() && 664 "Record must be an anonymous struct or union!"); 665 666 // FIXME: Once Decls are directly linked together, this will be an O(1) 667 // operation rather than a slow walk through DeclContext's vector (which 668 // itself will be eliminated). DeclGroups might make this even better. 669 DeclContext *Ctx = Record->getDeclContext(); 670 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 671 DEnd = Ctx->decls_end(Context); 672 D != DEnd; ++D) { 673 if (*D == Record) { 674 // The object for the anonymous struct/union directly 675 // follows its type in the list of declarations. 676 ++D; 677 assert(D != DEnd && "Missing object for anonymous record"); 678 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 679 return *D; 680 } 681 } 682 683 assert(false && "Missing object for anonymous record"); 684 return 0; 685} 686 687/// \brief Given a field that represents a member of an anonymous 688/// struct/union, build the path from that field's context to the 689/// actual member. 690/// 691/// Construct the sequence of field member references we'll have to 692/// perform to get to the field in the anonymous union/struct. The 693/// list of members is built from the field outward, so traverse it 694/// backwards to go from an object in the current context to the field 695/// we found. 696/// 697/// \returns The variable from which the field access should begin, 698/// for an anonymous struct/union that is not a member of another 699/// class. Otherwise, returns NULL. 700VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 701 llvm::SmallVectorImpl<FieldDecl *> &Path) { 702 assert(Field->getDeclContext()->isRecord() && 703 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 704 && "Field must be stored inside an anonymous struct or union"); 705 706 Path.push_back(Field); 707 VarDecl *BaseObject = 0; 708 DeclContext *Ctx = Field->getDeclContext(); 709 do { 710 RecordDecl *Record = cast<RecordDecl>(Ctx); 711 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 712 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 713 Path.push_back(AnonField); 714 else { 715 BaseObject = cast<VarDecl>(AnonObject); 716 break; 717 } 718 Ctx = Ctx->getParent(); 719 } while (Ctx->isRecord() && 720 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 721 722 return BaseObject; 723} 724 725Sema::OwningExprResult 726Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 727 FieldDecl *Field, 728 Expr *BaseObjectExpr, 729 SourceLocation OpLoc) { 730 llvm::SmallVector<FieldDecl *, 4> AnonFields; 731 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 732 AnonFields); 733 734 // Build the expression that refers to the base object, from 735 // which we will build a sequence of member references to each 736 // of the anonymous union objects and, eventually, the field we 737 // found via name lookup. 738 bool BaseObjectIsPointer = false; 739 unsigned ExtraQuals = 0; 740 if (BaseObject) { 741 // BaseObject is an anonymous struct/union variable (and is, 742 // therefore, not part of another non-anonymous record). 743 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 744 MarkDeclarationReferenced(Loc, BaseObject); 745 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 746 SourceLocation()); 747 ExtraQuals 748 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 749 } else if (BaseObjectExpr) { 750 // The caller provided the base object expression. Determine 751 // whether its a pointer and whether it adds any qualifiers to the 752 // anonymous struct/union fields we're looking into. 753 QualType ObjectType = BaseObjectExpr->getType(); 754 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 755 BaseObjectIsPointer = true; 756 ObjectType = ObjectPtr->getPointeeType(); 757 } 758 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 759 } else { 760 // We've found a member of an anonymous struct/union that is 761 // inside a non-anonymous struct/union, so in a well-formed 762 // program our base object expression is "this". 763 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 764 if (!MD->isStatic()) { 765 QualType AnonFieldType 766 = Context.getTagDeclType( 767 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 768 QualType ThisType = Context.getTagDeclType(MD->getParent()); 769 if ((Context.getCanonicalType(AnonFieldType) 770 == Context.getCanonicalType(ThisType)) || 771 IsDerivedFrom(ThisType, AnonFieldType)) { 772 // Our base object expression is "this". 773 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 774 MD->getThisType(Context)); 775 BaseObjectIsPointer = true; 776 } 777 } else { 778 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 779 << Field->getDeclName()); 780 } 781 ExtraQuals = MD->getTypeQualifiers(); 782 } 783 784 if (!BaseObjectExpr) 785 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 786 << Field->getDeclName()); 787 } 788 789 // Build the implicit member references to the field of the 790 // anonymous struct/union. 791 Expr *Result = BaseObjectExpr; 792 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 793 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 794 FI != FIEnd; ++FI) { 795 QualType MemberType = (*FI)->getType(); 796 if (!(*FI)->isMutable()) { 797 unsigned combinedQualifiers 798 = MemberType.getCVRQualifiers() | ExtraQuals; 799 MemberType = MemberType.getQualifiedType(combinedQualifiers); 800 } 801 MarkDeclarationReferenced(Loc, *FI); 802 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 803 OpLoc, MemberType); 804 BaseObjectIsPointer = false; 805 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 806 } 807 808 return Owned(Result); 809} 810 811/// ActOnDeclarationNameExpr - The parser has read some kind of name 812/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 813/// performs lookup on that name and returns an expression that refers 814/// to that name. This routine isn't directly called from the parser, 815/// because the parser doesn't know about DeclarationName. Rather, 816/// this routine is called by ActOnIdentifierExpr, 817/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 818/// which form the DeclarationName from the corresponding syntactic 819/// forms. 820/// 821/// HasTrailingLParen indicates whether this identifier is used in a 822/// function call context. LookupCtx is only used for a C++ 823/// qualified-id (foo::bar) to indicate the class or namespace that 824/// the identifier must be a member of. 825/// 826/// isAddressOfOperand means that this expression is the direct operand 827/// of an address-of operator. This matters because this is the only 828/// situation where a qualified name referencing a non-static member may 829/// appear outside a member function of this class. 830Sema::OwningExprResult 831Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 832 DeclarationName Name, bool HasTrailingLParen, 833 const CXXScopeSpec *SS, 834 bool isAddressOfOperand) { 835 // Could be enum-constant, value decl, instance variable, etc. 836 if (SS && SS->isInvalid()) 837 return ExprError(); 838 839 // C++ [temp.dep.expr]p3: 840 // An id-expression is type-dependent if it contains: 841 // -- a nested-name-specifier that contains a class-name that 842 // names a dependent type. 843 // FIXME: Member of the current instantiation. 844 if (SS && isDependentScopeSpecifier(*SS)) { 845 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 846 Loc, SS->getRange(), 847 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 848 } 849 850 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 851 false, true, Loc); 852 853 if (Lookup.isAmbiguous()) { 854 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 855 SS && SS->isSet() ? SS->getRange() 856 : SourceRange()); 857 return ExprError(); 858 } 859 860 NamedDecl *D = Lookup.getAsDecl(); 861 862 // If this reference is in an Objective-C method, then ivar lookup happens as 863 // well. 864 IdentifierInfo *II = Name.getAsIdentifierInfo(); 865 if (II && getCurMethodDecl()) { 866 // There are two cases to handle here. 1) scoped lookup could have failed, 867 // in which case we should look for an ivar. 2) scoped lookup could have 868 // found a decl, but that decl is outside the current instance method (i.e. 869 // a global variable). In these two cases, we do a lookup for an ivar with 870 // this name, if the lookup sucedes, we replace it our current decl. 871 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 872 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 873 ObjCInterfaceDecl *ClassDeclared; 874 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 875 ClassDeclared)) { 876 // Check if referencing a field with __attribute__((deprecated)). 877 if (DiagnoseUseOfDecl(IV, Loc)) 878 return ExprError(); 879 880 // If we're referencing an invalid decl, just return this as a silent 881 // error node. The error diagnostic was already emitted on the decl. 882 if (IV->isInvalidDecl()) 883 return ExprError(); 884 885 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 886 // If a class method attemps to use a free standing ivar, this is 887 // an error. 888 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 889 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 890 << IV->getDeclName()); 891 // If a class method uses a global variable, even if an ivar with 892 // same name exists, use the global. 893 if (!IsClsMethod) { 894 if (IV->getAccessControl() == ObjCIvarDecl::Private && 895 ClassDeclared != IFace) 896 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 897 // FIXME: This should use a new expr for a direct reference, don't 898 // turn this into Self->ivar, just return a BareIVarExpr or something. 899 IdentifierInfo &II = Context.Idents.get("self"); 900 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 901 MarkDeclarationReferenced(Loc, IV); 902 return Owned(new (Context) 903 ObjCIvarRefExpr(IV, IV->getType(), Loc, 904 SelfExpr.takeAs<Expr>(), true, true)); 905 } 906 } 907 } 908 else if (getCurMethodDecl()->isInstanceMethod()) { 909 // We should warn if a local variable hides an ivar. 910 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 911 ObjCInterfaceDecl *ClassDeclared; 912 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 913 ClassDeclared)) { 914 if (IV->getAccessControl() != ObjCIvarDecl::Private || 915 IFace == ClassDeclared) 916 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 917 } 918 } 919 // Needed to implement property "super.method" notation. 920 if (D == 0 && II->isStr("super")) { 921 QualType T; 922 923 if (getCurMethodDecl()->isInstanceMethod()) 924 T = Context.getPointerType(Context.getObjCInterfaceType( 925 getCurMethodDecl()->getClassInterface())); 926 else 927 T = Context.getObjCClassType(); 928 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 929 } 930 } 931 932 // Determine whether this name might be a candidate for 933 // argument-dependent lookup. 934 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 935 HasTrailingLParen; 936 937 if (ADL && D == 0) { 938 // We've seen something of the form 939 // 940 // identifier( 941 // 942 // and we did not find any entity by the name 943 // "identifier". However, this identifier is still subject to 944 // argument-dependent lookup, so keep track of the name. 945 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 946 Context.OverloadTy, 947 Loc)); 948 } 949 950 if (D == 0) { 951 // Otherwise, this could be an implicitly declared function reference (legal 952 // in C90, extension in C99). 953 if (HasTrailingLParen && II && 954 !getLangOptions().CPlusPlus) // Not in C++. 955 D = ImplicitlyDefineFunction(Loc, *II, S); 956 else { 957 // If this name wasn't predeclared and if this is not a function call, 958 // diagnose the problem. 959 if (SS && !SS->isEmpty()) 960 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 961 << Name << SS->getRange()); 962 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 963 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 964 return ExprError(Diag(Loc, diag::err_undeclared_use) 965 << Name.getAsString()); 966 else 967 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 968 } 969 } 970 971 // If this is an expression of the form &Class::member, don't build an 972 // implicit member ref, because we want a pointer to the member in general, 973 // not any specific instance's member. 974 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 975 DeclContext *DC = computeDeclContext(*SS); 976 if (D && isa<CXXRecordDecl>(DC)) { 977 QualType DType; 978 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 979 DType = FD->getType().getNonReferenceType(); 980 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 981 DType = Method->getType(); 982 } else if (isa<OverloadedFunctionDecl>(D)) { 983 DType = Context.OverloadTy; 984 } 985 // Could be an inner type. That's diagnosed below, so ignore it here. 986 if (!DType.isNull()) { 987 // The pointer is type- and value-dependent if it points into something 988 // dependent. 989 bool Dependent = DC->isDependentContext(); 990 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 991 } 992 } 993 } 994 995 // We may have found a field within an anonymous union or struct 996 // (C++ [class.union]). 997 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 998 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 999 return BuildAnonymousStructUnionMemberReference(Loc, FD); 1000 1001 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1002 if (!MD->isStatic()) { 1003 // C++ [class.mfct.nonstatic]p2: 1004 // [...] if name lookup (3.4.1) resolves the name in the 1005 // id-expression to a nonstatic nontype member of class X or of 1006 // a base class of X, the id-expression is transformed into a 1007 // class member access expression (5.2.5) using (*this) (9.3.2) 1008 // as the postfix-expression to the left of the '.' operator. 1009 DeclContext *Ctx = 0; 1010 QualType MemberType; 1011 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1012 Ctx = FD->getDeclContext(); 1013 MemberType = FD->getType(); 1014 1015 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 1016 MemberType = RefType->getPointeeType(); 1017 else if (!FD->isMutable()) { 1018 unsigned combinedQualifiers 1019 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1020 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1021 } 1022 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1023 if (!Method->isStatic()) { 1024 Ctx = Method->getParent(); 1025 MemberType = Method->getType(); 1026 } 1027 } else if (OverloadedFunctionDecl *Ovl 1028 = dyn_cast<OverloadedFunctionDecl>(D)) { 1029 for (OverloadedFunctionDecl::function_iterator 1030 Func = Ovl->function_begin(), 1031 FuncEnd = Ovl->function_end(); 1032 Func != FuncEnd; ++Func) { 1033 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1034 if (!DMethod->isStatic()) { 1035 Ctx = Ovl->getDeclContext(); 1036 MemberType = Context.OverloadTy; 1037 break; 1038 } 1039 } 1040 } 1041 1042 if (Ctx && Ctx->isRecord()) { 1043 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1044 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1045 if ((Context.getCanonicalType(CtxType) 1046 == Context.getCanonicalType(ThisType)) || 1047 IsDerivedFrom(ThisType, CtxType)) { 1048 // Build the implicit member access expression. 1049 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1050 MD->getThisType(Context)); 1051 MarkDeclarationReferenced(Loc, D); 1052 return Owned(new (Context) MemberExpr(This, true, D, 1053 Loc, MemberType)); 1054 } 1055 } 1056 } 1057 } 1058 1059 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1060 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1061 if (MD->isStatic()) 1062 // "invalid use of member 'x' in static member function" 1063 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1064 << FD->getDeclName()); 1065 } 1066 1067 // Any other ways we could have found the field in a well-formed 1068 // program would have been turned into implicit member expressions 1069 // above. 1070 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1071 << FD->getDeclName()); 1072 } 1073 1074 if (isa<TypedefDecl>(D)) 1075 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1076 if (isa<ObjCInterfaceDecl>(D)) 1077 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1078 if (isa<NamespaceDecl>(D)) 1079 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1080 1081 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1082 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1083 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1084 false, false, SS); 1085 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1086 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1087 false, false, SS); 1088 ValueDecl *VD = cast<ValueDecl>(D); 1089 1090 // Check whether this declaration can be used. Note that we suppress 1091 // this check when we're going to perform argument-dependent lookup 1092 // on this function name, because this might not be the function 1093 // that overload resolution actually selects. 1094 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1095 return ExprError(); 1096 1097 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 1098 // Warn about constructs like: 1099 // if (void *X = foo()) { ... } else { X }. 1100 // In the else block, the pointer is always false. 1101 1102 // FIXME: In a template instantiation, we don't have scope 1103 // information to check this property. 1104 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 1105 Scope *CheckS = S; 1106 while (CheckS) { 1107 if (CheckS->isWithinElse() && 1108 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 1109 if (Var->getType()->isBooleanType()) 1110 ExprError(Diag(Loc, diag::warn_value_always_false) 1111 << Var->getDeclName()); 1112 else 1113 ExprError(Diag(Loc, diag::warn_value_always_zero) 1114 << Var->getDeclName()); 1115 break; 1116 } 1117 1118 // Move up one more control parent to check again. 1119 CheckS = CheckS->getControlParent(); 1120 if (CheckS) 1121 CheckS = CheckS->getParent(); 1122 } 1123 } 1124 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 1125 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1126 // C99 DR 316 says that, if a function type comes from a 1127 // function definition (without a prototype), that type is only 1128 // used for checking compatibility. Therefore, when referencing 1129 // the function, we pretend that we don't have the full function 1130 // type. 1131 QualType T = Func->getType(); 1132 QualType NoProtoType = T; 1133 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1134 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1135 return BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS); 1136 } 1137 } 1138 1139 // Only create DeclRefExpr's for valid Decl's. 1140 if (VD->isInvalidDecl()) 1141 return ExprError(); 1142 1143 // If the identifier reference is inside a block, and it refers to a value 1144 // that is outside the block, create a BlockDeclRefExpr instead of a 1145 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1146 // the block is formed. 1147 // 1148 // We do not do this for things like enum constants, global variables, etc, 1149 // as they do not get snapshotted. 1150 // 1151 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1152 MarkDeclarationReferenced(Loc, VD); 1153 QualType ExprTy = VD->getType().getNonReferenceType(); 1154 // The BlocksAttr indicates the variable is bound by-reference. 1155 if (VD->getAttr<BlocksAttr>(Context)) 1156 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1157 // This is to record that a 'const' was actually synthesize and added. 1158 bool constAdded = !ExprTy.isConstQualified(); 1159 // Variable will be bound by-copy, make it const within the closure. 1160 1161 ExprTy.addConst(); 1162 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1163 constAdded)); 1164 } 1165 // If this reference is not in a block or if the referenced variable is 1166 // within the block, create a normal DeclRefExpr. 1167 1168 bool TypeDependent = false; 1169 bool ValueDependent = false; 1170 if (getLangOptions().CPlusPlus) { 1171 // C++ [temp.dep.expr]p3: 1172 // An id-expression is type-dependent if it contains: 1173 // - an identifier that was declared with a dependent type, 1174 if (VD->getType()->isDependentType()) 1175 TypeDependent = true; 1176 // - FIXME: a template-id that is dependent, 1177 // - a conversion-function-id that specifies a dependent type, 1178 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1179 Name.getCXXNameType()->isDependentType()) 1180 TypeDependent = true; 1181 // - a nested-name-specifier that contains a class-name that 1182 // names a dependent type. 1183 else if (SS && !SS->isEmpty()) { 1184 for (DeclContext *DC = computeDeclContext(*SS); 1185 DC; DC = DC->getParent()) { 1186 // FIXME: could stop early at namespace scope. 1187 if (DC->isRecord()) { 1188 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1189 if (Context.getTypeDeclType(Record)->isDependentType()) { 1190 TypeDependent = true; 1191 break; 1192 } 1193 } 1194 } 1195 } 1196 1197 // C++ [temp.dep.constexpr]p2: 1198 // 1199 // An identifier is value-dependent if it is: 1200 // - a name declared with a dependent type, 1201 if (TypeDependent) 1202 ValueDependent = true; 1203 // - the name of a non-type template parameter, 1204 else if (isa<NonTypeTemplateParmDecl>(VD)) 1205 ValueDependent = true; 1206 // - a constant with integral or enumeration type and is 1207 // initialized with an expression that is value-dependent 1208 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1209 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1210 Dcl->getInit()) { 1211 ValueDependent = Dcl->getInit()->isValueDependent(); 1212 } 1213 } 1214 } 1215 1216 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1217 TypeDependent, ValueDependent, SS); 1218} 1219 1220Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1221 tok::TokenKind Kind) { 1222 PredefinedExpr::IdentType IT; 1223 1224 switch (Kind) { 1225 default: assert(0 && "Unknown simple primary expr!"); 1226 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1227 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1228 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1229 } 1230 1231 // Pre-defined identifiers are of type char[x], where x is the length of the 1232 // string. 1233 unsigned Length; 1234 if (FunctionDecl *FD = getCurFunctionDecl()) 1235 Length = FD->getIdentifier()->getLength(); 1236 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1237 Length = MD->getSynthesizedMethodSize(); 1238 else { 1239 Diag(Loc, diag::ext_predef_outside_function); 1240 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1241 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1242 } 1243 1244 1245 llvm::APInt LengthI(32, Length + 1); 1246 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1247 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1248 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1249} 1250 1251Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1252 llvm::SmallString<16> CharBuffer; 1253 CharBuffer.resize(Tok.getLength()); 1254 const char *ThisTokBegin = &CharBuffer[0]; 1255 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1256 1257 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1258 Tok.getLocation(), PP); 1259 if (Literal.hadError()) 1260 return ExprError(); 1261 1262 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1263 1264 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1265 Literal.isWide(), 1266 type, Tok.getLocation())); 1267} 1268 1269Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1270 // Fast path for a single digit (which is quite common). A single digit 1271 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1272 if (Tok.getLength() == 1) { 1273 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1274 unsigned IntSize = Context.Target.getIntWidth(); 1275 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1276 Context.IntTy, Tok.getLocation())); 1277 } 1278 1279 llvm::SmallString<512> IntegerBuffer; 1280 // Add padding so that NumericLiteralParser can overread by one character. 1281 IntegerBuffer.resize(Tok.getLength()+1); 1282 const char *ThisTokBegin = &IntegerBuffer[0]; 1283 1284 // Get the spelling of the token, which eliminates trigraphs, etc. 1285 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1286 1287 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1288 Tok.getLocation(), PP); 1289 if (Literal.hadError) 1290 return ExprError(); 1291 1292 Expr *Res; 1293 1294 if (Literal.isFloatingLiteral()) { 1295 QualType Ty; 1296 if (Literal.isFloat) 1297 Ty = Context.FloatTy; 1298 else if (!Literal.isLong) 1299 Ty = Context.DoubleTy; 1300 else 1301 Ty = Context.LongDoubleTy; 1302 1303 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1304 1305 // isExact will be set by GetFloatValue(). 1306 bool isExact = false; 1307 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1308 &isExact, Ty, Tok.getLocation()); 1309 1310 } else if (!Literal.isIntegerLiteral()) { 1311 return ExprError(); 1312 } else { 1313 QualType Ty; 1314 1315 // long long is a C99 feature. 1316 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1317 Literal.isLongLong) 1318 Diag(Tok.getLocation(), diag::ext_longlong); 1319 1320 // Get the value in the widest-possible width. 1321 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1322 1323 if (Literal.GetIntegerValue(ResultVal)) { 1324 // If this value didn't fit into uintmax_t, warn and force to ull. 1325 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1326 Ty = Context.UnsignedLongLongTy; 1327 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1328 "long long is not intmax_t?"); 1329 } else { 1330 // If this value fits into a ULL, try to figure out what else it fits into 1331 // according to the rules of C99 6.4.4.1p5. 1332 1333 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1334 // be an unsigned int. 1335 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1336 1337 // Check from smallest to largest, picking the smallest type we can. 1338 unsigned Width = 0; 1339 if (!Literal.isLong && !Literal.isLongLong) { 1340 // Are int/unsigned possibilities? 1341 unsigned IntSize = Context.Target.getIntWidth(); 1342 1343 // Does it fit in a unsigned int? 1344 if (ResultVal.isIntN(IntSize)) { 1345 // Does it fit in a signed int? 1346 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1347 Ty = Context.IntTy; 1348 else if (AllowUnsigned) 1349 Ty = Context.UnsignedIntTy; 1350 Width = IntSize; 1351 } 1352 } 1353 1354 // Are long/unsigned long possibilities? 1355 if (Ty.isNull() && !Literal.isLongLong) { 1356 unsigned LongSize = Context.Target.getLongWidth(); 1357 1358 // Does it fit in a unsigned long? 1359 if (ResultVal.isIntN(LongSize)) { 1360 // Does it fit in a signed long? 1361 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1362 Ty = Context.LongTy; 1363 else if (AllowUnsigned) 1364 Ty = Context.UnsignedLongTy; 1365 Width = LongSize; 1366 } 1367 } 1368 1369 // Finally, check long long if needed. 1370 if (Ty.isNull()) { 1371 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1372 1373 // Does it fit in a unsigned long long? 1374 if (ResultVal.isIntN(LongLongSize)) { 1375 // Does it fit in a signed long long? 1376 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1377 Ty = Context.LongLongTy; 1378 else if (AllowUnsigned) 1379 Ty = Context.UnsignedLongLongTy; 1380 Width = LongLongSize; 1381 } 1382 } 1383 1384 // If we still couldn't decide a type, we probably have something that 1385 // does not fit in a signed long long, but has no U suffix. 1386 if (Ty.isNull()) { 1387 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1388 Ty = Context.UnsignedLongLongTy; 1389 Width = Context.Target.getLongLongWidth(); 1390 } 1391 1392 if (ResultVal.getBitWidth() != Width) 1393 ResultVal.trunc(Width); 1394 } 1395 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1396 } 1397 1398 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1399 if (Literal.isImaginary) 1400 Res = new (Context) ImaginaryLiteral(Res, 1401 Context.getComplexType(Res->getType())); 1402 1403 return Owned(Res); 1404} 1405 1406Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1407 SourceLocation R, ExprArg Val) { 1408 Expr *E = Val.takeAs<Expr>(); 1409 assert((E != 0) && "ActOnParenExpr() missing expr"); 1410 return Owned(new (Context) ParenExpr(L, R, E)); 1411} 1412 1413/// The UsualUnaryConversions() function is *not* called by this routine. 1414/// See C99 6.3.2.1p[2-4] for more details. 1415bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1416 SourceLocation OpLoc, 1417 const SourceRange &ExprRange, 1418 bool isSizeof) { 1419 if (exprType->isDependentType()) 1420 return false; 1421 1422 // C99 6.5.3.4p1: 1423 if (isa<FunctionType>(exprType)) { 1424 // alignof(function) is allowed as an extension. 1425 if (isSizeof) 1426 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1427 return false; 1428 } 1429 1430 // Allow sizeof(void)/alignof(void) as an extension. 1431 if (exprType->isVoidType()) { 1432 Diag(OpLoc, diag::ext_sizeof_void_type) 1433 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1434 return false; 1435 } 1436 1437 if (RequireCompleteType(OpLoc, exprType, 1438 isSizeof ? diag::err_sizeof_incomplete_type : 1439 diag::err_alignof_incomplete_type, 1440 ExprRange)) 1441 return true; 1442 1443 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1444 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1445 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1446 << exprType << isSizeof << ExprRange; 1447 return true; 1448 } 1449 1450 return false; 1451} 1452 1453bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1454 const SourceRange &ExprRange) { 1455 E = E->IgnoreParens(); 1456 1457 // alignof decl is always ok. 1458 if (isa<DeclRefExpr>(E)) 1459 return false; 1460 1461 // Cannot know anything else if the expression is dependent. 1462 if (E->isTypeDependent()) 1463 return false; 1464 1465 if (E->getBitField()) { 1466 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1467 return true; 1468 } 1469 1470 // Alignment of a field access is always okay, so long as it isn't a 1471 // bit-field. 1472 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1473 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1474 return false; 1475 1476 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1477} 1478 1479/// \brief Build a sizeof or alignof expression given a type operand. 1480Action::OwningExprResult 1481Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1482 bool isSizeOf, SourceRange R) { 1483 if (T.isNull()) 1484 return ExprError(); 1485 1486 if (!T->isDependentType() && 1487 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1488 return ExprError(); 1489 1490 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1491 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1492 Context.getSizeType(), OpLoc, 1493 R.getEnd())); 1494} 1495 1496/// \brief Build a sizeof or alignof expression given an expression 1497/// operand. 1498Action::OwningExprResult 1499Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1500 bool isSizeOf, SourceRange R) { 1501 // Verify that the operand is valid. 1502 bool isInvalid = false; 1503 if (E->isTypeDependent()) { 1504 // Delay type-checking for type-dependent expressions. 1505 } else if (!isSizeOf) { 1506 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1507 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1508 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1509 isInvalid = true; 1510 } else { 1511 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1512 } 1513 1514 if (isInvalid) 1515 return ExprError(); 1516 1517 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1518 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1519 Context.getSizeType(), OpLoc, 1520 R.getEnd())); 1521} 1522 1523/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1524/// the same for @c alignof and @c __alignof 1525/// Note that the ArgRange is invalid if isType is false. 1526Action::OwningExprResult 1527Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1528 void *TyOrEx, const SourceRange &ArgRange) { 1529 // If error parsing type, ignore. 1530 if (TyOrEx == 0) return ExprError(); 1531 1532 if (isType) { 1533 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1534 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1535 } 1536 1537 // Get the end location. 1538 Expr *ArgEx = (Expr *)TyOrEx; 1539 Action::OwningExprResult Result 1540 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1541 1542 if (Result.isInvalid()) 1543 DeleteExpr(ArgEx); 1544 1545 return move(Result); 1546} 1547 1548QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1549 if (V->isTypeDependent()) 1550 return Context.DependentTy; 1551 1552 // These operators return the element type of a complex type. 1553 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1554 return CT->getElementType(); 1555 1556 // Otherwise they pass through real integer and floating point types here. 1557 if (V->getType()->isArithmeticType()) 1558 return V->getType(); 1559 1560 // Reject anything else. 1561 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1562 << (isReal ? "__real" : "__imag"); 1563 return QualType(); 1564} 1565 1566 1567 1568Action::OwningExprResult 1569Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1570 tok::TokenKind Kind, ExprArg Input) { 1571 Expr *Arg = (Expr *)Input.get(); 1572 1573 UnaryOperator::Opcode Opc; 1574 switch (Kind) { 1575 default: assert(0 && "Unknown unary op!"); 1576 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1577 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1578 } 1579 1580 if (getLangOptions().CPlusPlus && 1581 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1582 // Which overloaded operator? 1583 OverloadedOperatorKind OverOp = 1584 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1585 1586 // C++ [over.inc]p1: 1587 // 1588 // [...] If the function is a member function with one 1589 // parameter (which shall be of type int) or a non-member 1590 // function with two parameters (the second of which shall be 1591 // of type int), it defines the postfix increment operator ++ 1592 // for objects of that type. When the postfix increment is 1593 // called as a result of using the ++ operator, the int 1594 // argument will have value zero. 1595 Expr *Args[2] = { 1596 Arg, 1597 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1598 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1599 }; 1600 1601 // Build the candidate set for overloading 1602 OverloadCandidateSet CandidateSet; 1603 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1604 1605 // Perform overload resolution. 1606 OverloadCandidateSet::iterator Best; 1607 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1608 case OR_Success: { 1609 // We found a built-in operator or an overloaded operator. 1610 FunctionDecl *FnDecl = Best->Function; 1611 1612 if (FnDecl) { 1613 // We matched an overloaded operator. Build a call to that 1614 // operator. 1615 1616 // Convert the arguments. 1617 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1618 if (PerformObjectArgumentInitialization(Arg, Method)) 1619 return ExprError(); 1620 } else { 1621 // Convert the arguments. 1622 if (PerformCopyInitialization(Arg, 1623 FnDecl->getParamDecl(0)->getType(), 1624 "passing")) 1625 return ExprError(); 1626 } 1627 1628 // Determine the result type 1629 QualType ResultTy 1630 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1631 ResultTy = ResultTy.getNonReferenceType(); 1632 1633 // Build the actual expression node. 1634 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1635 SourceLocation()); 1636 UsualUnaryConversions(FnExpr); 1637 1638 Input.release(); 1639 Args[0] = Arg; 1640 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1641 Args, 2, ResultTy, 1642 OpLoc)); 1643 } else { 1644 // We matched a built-in operator. Convert the arguments, then 1645 // break out so that we will build the appropriate built-in 1646 // operator node. 1647 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1648 "passing")) 1649 return ExprError(); 1650 1651 break; 1652 } 1653 } 1654 1655 case OR_No_Viable_Function: 1656 // No viable function; fall through to handling this as a 1657 // built-in operator, which will produce an error message for us. 1658 break; 1659 1660 case OR_Ambiguous: 1661 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1662 << UnaryOperator::getOpcodeStr(Opc) 1663 << Arg->getSourceRange(); 1664 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1665 return ExprError(); 1666 1667 case OR_Deleted: 1668 Diag(OpLoc, diag::err_ovl_deleted_oper) 1669 << Best->Function->isDeleted() 1670 << UnaryOperator::getOpcodeStr(Opc) 1671 << Arg->getSourceRange(); 1672 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1673 return ExprError(); 1674 } 1675 1676 // Either we found no viable overloaded operator or we matched a 1677 // built-in operator. In either case, fall through to trying to 1678 // build a built-in operation. 1679 } 1680 1681 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1682 Opc == UnaryOperator::PostInc); 1683 if (result.isNull()) 1684 return ExprError(); 1685 Input.release(); 1686 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1687} 1688 1689Action::OwningExprResult 1690Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1691 ExprArg Idx, SourceLocation RLoc) { 1692 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1693 *RHSExp = static_cast<Expr*>(Idx.get()); 1694 1695 if (getLangOptions().CPlusPlus && 1696 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1697 Base.release(); 1698 Idx.release(); 1699 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1700 Context.DependentTy, RLoc)); 1701 } 1702 1703 if (getLangOptions().CPlusPlus && 1704 (LHSExp->getType()->isRecordType() || 1705 LHSExp->getType()->isEnumeralType() || 1706 RHSExp->getType()->isRecordType() || 1707 RHSExp->getType()->isEnumeralType())) { 1708 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1709 // to the candidate set. 1710 OverloadCandidateSet CandidateSet; 1711 Expr *Args[2] = { LHSExp, RHSExp }; 1712 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1713 SourceRange(LLoc, RLoc)); 1714 1715 // Perform overload resolution. 1716 OverloadCandidateSet::iterator Best; 1717 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1718 case OR_Success: { 1719 // We found a built-in operator or an overloaded operator. 1720 FunctionDecl *FnDecl = Best->Function; 1721 1722 if (FnDecl) { 1723 // We matched an overloaded operator. Build a call to that 1724 // operator. 1725 1726 // Convert the arguments. 1727 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1728 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1729 PerformCopyInitialization(RHSExp, 1730 FnDecl->getParamDecl(0)->getType(), 1731 "passing")) 1732 return ExprError(); 1733 } else { 1734 // Convert the arguments. 1735 if (PerformCopyInitialization(LHSExp, 1736 FnDecl->getParamDecl(0)->getType(), 1737 "passing") || 1738 PerformCopyInitialization(RHSExp, 1739 FnDecl->getParamDecl(1)->getType(), 1740 "passing")) 1741 return ExprError(); 1742 } 1743 1744 // Determine the result type 1745 QualType ResultTy 1746 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1747 ResultTy = ResultTy.getNonReferenceType(); 1748 1749 // Build the actual expression node. 1750 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1751 SourceLocation()); 1752 UsualUnaryConversions(FnExpr); 1753 1754 Base.release(); 1755 Idx.release(); 1756 Args[0] = LHSExp; 1757 Args[1] = RHSExp; 1758 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1759 FnExpr, Args, 2, 1760 ResultTy, LLoc)); 1761 } else { 1762 // We matched a built-in operator. Convert the arguments, then 1763 // break out so that we will build the appropriate built-in 1764 // operator node. 1765 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1766 "passing") || 1767 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1768 "passing")) 1769 return ExprError(); 1770 1771 break; 1772 } 1773 } 1774 1775 case OR_No_Viable_Function: 1776 // No viable function; fall through to handling this as a 1777 // built-in operator, which will produce an error message for us. 1778 break; 1779 1780 case OR_Ambiguous: 1781 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1782 << "[]" 1783 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1784 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1785 return ExprError(); 1786 1787 case OR_Deleted: 1788 Diag(LLoc, diag::err_ovl_deleted_oper) 1789 << Best->Function->isDeleted() 1790 << "[]" 1791 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1792 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1793 return ExprError(); 1794 } 1795 1796 // Either we found no viable overloaded operator or we matched a 1797 // built-in operator. In either case, fall through to trying to 1798 // build a built-in operation. 1799 } 1800 1801 // Perform default conversions. 1802 DefaultFunctionArrayConversion(LHSExp); 1803 DefaultFunctionArrayConversion(RHSExp); 1804 1805 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1806 1807 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1808 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1809 // in the subscript position. As a result, we need to derive the array base 1810 // and index from the expression types. 1811 Expr *BaseExpr, *IndexExpr; 1812 QualType ResultType; 1813 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1814 BaseExpr = LHSExp; 1815 IndexExpr = RHSExp; 1816 ResultType = Context.DependentTy; 1817 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1818 BaseExpr = LHSExp; 1819 IndexExpr = RHSExp; 1820 ResultType = PTy->getPointeeType(); 1821 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1822 // Handle the uncommon case of "123[Ptr]". 1823 BaseExpr = RHSExp; 1824 IndexExpr = LHSExp; 1825 ResultType = PTy->getPointeeType(); 1826 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1827 BaseExpr = LHSExp; // vectors: V[123] 1828 IndexExpr = RHSExp; 1829 1830 // FIXME: need to deal with const... 1831 ResultType = VTy->getElementType(); 1832 } else if (LHSTy->isArrayType()) { 1833 // If we see an array that wasn't promoted by 1834 // DefaultFunctionArrayConversion, it must be an array that 1835 // wasn't promoted because of the C90 rule that doesn't 1836 // allow promoting non-lvalue arrays. Warn, then 1837 // force the promotion here. 1838 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1839 LHSExp->getSourceRange(); 1840 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1841 LHSTy = LHSExp->getType(); 1842 1843 BaseExpr = LHSExp; 1844 IndexExpr = RHSExp; 1845 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1846 } else if (RHSTy->isArrayType()) { 1847 // Same as previous, except for 123[f().a] case 1848 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1849 RHSExp->getSourceRange(); 1850 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1851 RHSTy = RHSExp->getType(); 1852 1853 BaseExpr = RHSExp; 1854 IndexExpr = LHSExp; 1855 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1856 } else { 1857 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1858 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1859 } 1860 // C99 6.5.2.1p1 1861 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1862 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1863 << IndexExpr->getSourceRange()); 1864 1865 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1866 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1867 // type. Note that Functions are not objects, and that (in C99 parlance) 1868 // incomplete types are not object types. 1869 if (ResultType->isFunctionType()) { 1870 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1871 << ResultType << BaseExpr->getSourceRange(); 1872 return ExprError(); 1873 } 1874 1875 if (!ResultType->isDependentType() && 1876 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1877 BaseExpr->getSourceRange())) 1878 return ExprError(); 1879 1880 // Diagnose bad cases where we step over interface counts. 1881 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1882 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1883 << ResultType << BaseExpr->getSourceRange(); 1884 return ExprError(); 1885 } 1886 1887 Base.release(); 1888 Idx.release(); 1889 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1890 ResultType, RLoc)); 1891} 1892 1893QualType Sema:: 1894CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1895 IdentifierInfo &CompName, SourceLocation CompLoc) { 1896 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1897 1898 // The vector accessor can't exceed the number of elements. 1899 const char *compStr = CompName.getName(); 1900 1901 // This flag determines whether or not the component is one of the four 1902 // special names that indicate a subset of exactly half the elements are 1903 // to be selected. 1904 bool HalvingSwizzle = false; 1905 1906 // This flag determines whether or not CompName has an 's' char prefix, 1907 // indicating that it is a string of hex values to be used as vector indices. 1908 bool HexSwizzle = *compStr == 's'; 1909 1910 // Check that we've found one of the special components, or that the component 1911 // names must come from the same set. 1912 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1913 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1914 HalvingSwizzle = true; 1915 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1916 do 1917 compStr++; 1918 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1919 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1920 do 1921 compStr++; 1922 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1923 } 1924 1925 if (!HalvingSwizzle && *compStr) { 1926 // We didn't get to the end of the string. This means the component names 1927 // didn't come from the same set *or* we encountered an illegal name. 1928 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1929 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1930 return QualType(); 1931 } 1932 1933 // Ensure no component accessor exceeds the width of the vector type it 1934 // operates on. 1935 if (!HalvingSwizzle) { 1936 compStr = CompName.getName(); 1937 1938 if (HexSwizzle) 1939 compStr++; 1940 1941 while (*compStr) { 1942 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1943 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1944 << baseType << SourceRange(CompLoc); 1945 return QualType(); 1946 } 1947 } 1948 } 1949 1950 // If this is a halving swizzle, verify that the base type has an even 1951 // number of elements. 1952 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1953 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1954 << baseType << SourceRange(CompLoc); 1955 return QualType(); 1956 } 1957 1958 // The component accessor looks fine - now we need to compute the actual type. 1959 // The vector type is implied by the component accessor. For example, 1960 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1961 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1962 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1963 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1964 : CompName.getLength(); 1965 if (HexSwizzle) 1966 CompSize--; 1967 1968 if (CompSize == 1) 1969 return vecType->getElementType(); 1970 1971 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1972 // Now look up the TypeDefDecl from the vector type. Without this, 1973 // diagostics look bad. We want extended vector types to appear built-in. 1974 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1975 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1976 return Context.getTypedefType(ExtVectorDecls[i]); 1977 } 1978 return VT; // should never get here (a typedef type should always be found). 1979} 1980 1981static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1982 IdentifierInfo &Member, 1983 const Selector &Sel, 1984 ASTContext &Context) { 1985 1986 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1987 return PD; 1988 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1989 return OMD; 1990 1991 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1992 E = PDecl->protocol_end(); I != E; ++I) { 1993 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1994 Context)) 1995 return D; 1996 } 1997 return 0; 1998} 1999 2000static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 2001 IdentifierInfo &Member, 2002 const Selector &Sel, 2003 ASTContext &Context) { 2004 // Check protocols on qualified interfaces. 2005 Decl *GDecl = 0; 2006 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2007 E = QIdTy->qual_end(); I != E; ++I) { 2008 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 2009 GDecl = PD; 2010 break; 2011 } 2012 // Also must look for a getter name which uses property syntax. 2013 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 2014 GDecl = OMD; 2015 break; 2016 } 2017 } 2018 if (!GDecl) { 2019 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2020 E = QIdTy->qual_end(); I != E; ++I) { 2021 // Search in the protocol-qualifier list of current protocol. 2022 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2023 if (GDecl) 2024 return GDecl; 2025 } 2026 } 2027 return GDecl; 2028} 2029 2030/// FindMethodInNestedImplementations - Look up a method in current and 2031/// all base class implementations. 2032/// 2033ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2034 const ObjCInterfaceDecl *IFace, 2035 const Selector &Sel) { 2036 ObjCMethodDecl *Method = 0; 2037 if (ObjCImplementationDecl *ImpDecl 2038 = LookupObjCImplementation(IFace->getIdentifier())) 2039 Method = ImpDecl->getInstanceMethod(Context, Sel); 2040 2041 if (!Method && IFace->getSuperClass()) 2042 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2043 return Method; 2044} 2045 2046Action::OwningExprResult 2047Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2048 tok::TokenKind OpKind, SourceLocation MemberLoc, 2049 IdentifierInfo &Member, 2050 DeclPtrTy ObjCImpDecl) { 2051 Expr *BaseExpr = Base.takeAs<Expr>(); 2052 assert(BaseExpr && "no record expression"); 2053 2054 // Perform default conversions. 2055 DefaultFunctionArrayConversion(BaseExpr); 2056 2057 QualType BaseType = BaseExpr->getType(); 2058 assert(!BaseType.isNull() && "no type for member expression"); 2059 2060 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2061 // must have pointer type, and the accessed type is the pointee. 2062 if (OpKind == tok::arrow) { 2063 if (BaseType->isDependentType()) 2064 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2065 BaseExpr, true, 2066 OpLoc, 2067 DeclarationName(&Member), 2068 MemberLoc)); 2069 else if (const PointerType *PT = BaseType->getAsPointerType()) 2070 BaseType = PT->getPointeeType(); 2071 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2072 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2073 MemberLoc, Member)); 2074 else 2075 return ExprError(Diag(MemberLoc, 2076 diag::err_typecheck_member_reference_arrow) 2077 << BaseType << BaseExpr->getSourceRange()); 2078 } else { 2079 if (BaseType->isDependentType()) { 2080 // Require that the base type isn't a pointer type 2081 // (so we'll report an error for) 2082 // T* t; 2083 // t.f; 2084 // 2085 // In Obj-C++, however, the above expression is valid, since it could be 2086 // accessing the 'f' property if T is an Obj-C interface. The extra check 2087 // allows this, while still reporting an error if T is a struct pointer. 2088 const PointerType *PT = BaseType->getAsPointerType(); 2089 2090 if (!PT || (getLangOptions().ObjC1 && 2091 !PT->getPointeeType()->isRecordType())) 2092 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2093 BaseExpr, false, 2094 OpLoc, 2095 DeclarationName(&Member), 2096 MemberLoc)); 2097 } 2098 } 2099 2100 // Handle field access to simple records. This also handles access to fields 2101 // of the ObjC 'id' struct. 2102 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2103 RecordDecl *RDecl = RTy->getDecl(); 2104 if (RequireCompleteType(OpLoc, BaseType, 2105 diag::err_typecheck_incomplete_tag, 2106 BaseExpr->getSourceRange())) 2107 return ExprError(); 2108 2109 // The record definition is complete, now make sure the member is valid. 2110 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2111 LookupResult Result 2112 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2113 LookupMemberName, false); 2114 2115 if (!Result) 2116 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2117 << &Member << BaseExpr->getSourceRange()); 2118 if (Result.isAmbiguous()) { 2119 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2120 MemberLoc, BaseExpr->getSourceRange()); 2121 return ExprError(); 2122 } 2123 2124 NamedDecl *MemberDecl = Result; 2125 2126 // If the decl being referenced had an error, return an error for this 2127 // sub-expr without emitting another error, in order to avoid cascading 2128 // error cases. 2129 if (MemberDecl->isInvalidDecl()) 2130 return ExprError(); 2131 2132 // Check the use of this field 2133 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2134 return ExprError(); 2135 2136 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2137 // We may have found a field within an anonymous union or struct 2138 // (C++ [class.union]). 2139 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2140 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2141 BaseExpr, OpLoc); 2142 2143 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2144 // FIXME: Handle address space modifiers 2145 QualType MemberType = FD->getType(); 2146 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2147 MemberType = Ref->getPointeeType(); 2148 else { 2149 unsigned combinedQualifiers = 2150 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2151 if (FD->isMutable()) 2152 combinedQualifiers &= ~QualType::Const; 2153 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2154 } 2155 2156 MarkDeclarationReferenced(MemberLoc, FD); 2157 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2158 MemberLoc, MemberType)); 2159 } 2160 2161 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2162 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2163 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2164 Var, MemberLoc, 2165 Var->getType().getNonReferenceType())); 2166 } 2167 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2168 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2169 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2170 MemberFn, MemberLoc, 2171 MemberFn->getType())); 2172 } 2173 if (OverloadedFunctionDecl *Ovl 2174 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2175 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2176 MemberLoc, Context.OverloadTy)); 2177 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2178 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2179 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2180 Enum, MemberLoc, Enum->getType())); 2181 } 2182 if (isa<TypeDecl>(MemberDecl)) 2183 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2184 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2185 2186 // We found a declaration kind that we didn't expect. This is a 2187 // generic error message that tells the user that she can't refer 2188 // to this member with '.' or '->'. 2189 return ExprError(Diag(MemberLoc, 2190 diag::err_typecheck_member_reference_unknown) 2191 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2192 } 2193 2194 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2195 // (*Obj).ivar. 2196 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2197 ObjCInterfaceDecl *ClassDeclared; 2198 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 2199 &Member, 2200 ClassDeclared)) { 2201 // If the decl being referenced had an error, return an error for this 2202 // sub-expr without emitting another error, in order to avoid cascading 2203 // error cases. 2204 if (IV->isInvalidDecl()) 2205 return ExprError(); 2206 2207 // Check whether we can reference this field. 2208 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2209 return ExprError(); 2210 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2211 IV->getAccessControl() != ObjCIvarDecl::Package) { 2212 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2213 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2214 ClassOfMethodDecl = MD->getClassInterface(); 2215 else if (ObjCImpDecl && getCurFunctionDecl()) { 2216 // Case of a c-function declared inside an objc implementation. 2217 // FIXME: For a c-style function nested inside an objc implementation 2218 // class, there is no implementation context available, so we pass 2219 // down the context as argument to this routine. Ideally, this context 2220 // need be passed down in the AST node and somehow calculated from the 2221 // AST for a function decl. 2222 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2223 if (ObjCImplementationDecl *IMPD = 2224 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2225 ClassOfMethodDecl = IMPD->getClassInterface(); 2226 else if (ObjCCategoryImplDecl* CatImplClass = 2227 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2228 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2229 } 2230 2231 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2232 if (ClassDeclared != IFTy->getDecl() || 2233 ClassOfMethodDecl != ClassDeclared) 2234 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2235 } 2236 // @protected 2237 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2238 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2239 } 2240 2241 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2242 MemberLoc, BaseExpr, 2243 OpKind == tok::arrow)); 2244 } 2245 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2246 << IFTy->getDecl()->getDeclName() << &Member 2247 << BaseExpr->getSourceRange()); 2248 } 2249 2250 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2251 // pointer to a (potentially qualified) interface type. 2252 const PointerType *PTy; 2253 const ObjCInterfaceType *IFTy; 2254 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2255 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2256 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2257 2258 // Search for a declared property first. 2259 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2260 &Member)) { 2261 // Check whether we can reference this property. 2262 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2263 return ExprError(); 2264 QualType ResTy = PD->getType(); 2265 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2266 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2267 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2268 ResTy = Getter->getResultType(); 2269 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2270 MemberLoc, BaseExpr)); 2271 } 2272 2273 // Check protocols on qualified interfaces. 2274 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2275 E = IFTy->qual_end(); I != E; ++I) 2276 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2277 &Member)) { 2278 // Check whether we can reference this property. 2279 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2280 return ExprError(); 2281 2282 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2283 MemberLoc, BaseExpr)); 2284 } 2285 2286 // If that failed, look for an "implicit" property by seeing if the nullary 2287 // selector is implemented. 2288 2289 // FIXME: The logic for looking up nullary and unary selectors should be 2290 // shared with the code in ActOnInstanceMessage. 2291 2292 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2293 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2294 2295 // If this reference is in an @implementation, check for 'private' methods. 2296 if (!Getter) 2297 Getter = FindMethodInNestedImplementations(IFace, Sel); 2298 2299 // Look through local category implementations associated with the class. 2300 if (!Getter) { 2301 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2302 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2303 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2304 } 2305 } 2306 if (Getter) { 2307 // Check if we can reference this property. 2308 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2309 return ExprError(); 2310 } 2311 // If we found a getter then this may be a valid dot-reference, we 2312 // will look for the matching setter, in case it is needed. 2313 Selector SetterSel = 2314 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2315 PP.getSelectorTable(), &Member); 2316 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2317 if (!Setter) { 2318 // If this reference is in an @implementation, also check for 'private' 2319 // methods. 2320 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2321 } 2322 // Look through local category implementations associated with the class. 2323 if (!Setter) { 2324 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2325 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2326 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2327 } 2328 } 2329 2330 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2331 return ExprError(); 2332 2333 if (Getter || Setter) { 2334 QualType PType; 2335 2336 if (Getter) 2337 PType = Getter->getResultType(); 2338 else { 2339 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2340 E = Setter->param_end(); PI != E; ++PI) 2341 PType = (*PI)->getType(); 2342 } 2343 // FIXME: we must check that the setter has property type. 2344 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2345 Setter, MemberLoc, BaseExpr)); 2346 } 2347 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2348 << &Member << BaseType); 2349 } 2350 // Handle properties on qualified "id" protocols. 2351 const ObjCObjectPointerType *QIdTy; 2352 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2353 // Check protocols on qualified interfaces. 2354 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2355 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2356 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2357 // Check the use of this declaration 2358 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2359 return ExprError(); 2360 2361 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2362 MemberLoc, BaseExpr)); 2363 } 2364 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2365 // Check the use of this method. 2366 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2367 return ExprError(); 2368 2369 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2370 OMD->getResultType(), 2371 OMD, OpLoc, MemberLoc, 2372 NULL, 0)); 2373 } 2374 } 2375 2376 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2377 << &Member << BaseType); 2378 } 2379 // Handle properties on ObjC 'Class' types. 2380 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2381 // Also must look for a getter name which uses property syntax. 2382 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2383 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2384 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2385 ObjCMethodDecl *Getter; 2386 // FIXME: need to also look locally in the implementation. 2387 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2388 // Check the use of this method. 2389 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2390 return ExprError(); 2391 } 2392 // If we found a getter then this may be a valid dot-reference, we 2393 // will look for the matching setter, in case it is needed. 2394 Selector SetterSel = 2395 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2396 PP.getSelectorTable(), &Member); 2397 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2398 if (!Setter) { 2399 // If this reference is in an @implementation, also check for 'private' 2400 // methods. 2401 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2402 } 2403 // Look through local category implementations associated with the class. 2404 if (!Setter) { 2405 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2406 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2407 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2408 } 2409 } 2410 2411 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2412 return ExprError(); 2413 2414 if (Getter || Setter) { 2415 QualType PType; 2416 2417 if (Getter) 2418 PType = Getter->getResultType(); 2419 else { 2420 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2421 E = Setter->param_end(); PI != E; ++PI) 2422 PType = (*PI)->getType(); 2423 } 2424 // FIXME: we must check that the setter has property type. 2425 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2426 Setter, MemberLoc, BaseExpr)); 2427 } 2428 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2429 << &Member << BaseType); 2430 } 2431 } 2432 2433 // Handle 'field access' to vectors, such as 'V.xx'. 2434 if (BaseType->isExtVectorType()) { 2435 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2436 if (ret.isNull()) 2437 return ExprError(); 2438 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2439 MemberLoc)); 2440 } 2441 2442 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2443 << BaseType << BaseExpr->getSourceRange(); 2444 2445 // If the user is trying to apply -> or . to a function or function 2446 // pointer, it's probably because they forgot parentheses to call 2447 // the function. Suggest the addition of those parentheses. 2448 if (BaseType == Context.OverloadTy || 2449 BaseType->isFunctionType() || 2450 (BaseType->isPointerType() && 2451 BaseType->getAsPointerType()->isFunctionType())) { 2452 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2453 Diag(Loc, diag::note_member_reference_needs_call) 2454 << CodeModificationHint::CreateInsertion(Loc, "()"); 2455 } 2456 2457 return ExprError(); 2458} 2459 2460/// ConvertArgumentsForCall - Converts the arguments specified in 2461/// Args/NumArgs to the parameter types of the function FDecl with 2462/// function prototype Proto. Call is the call expression itself, and 2463/// Fn is the function expression. For a C++ member function, this 2464/// routine does not attempt to convert the object argument. Returns 2465/// true if the call is ill-formed. 2466bool 2467Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2468 FunctionDecl *FDecl, 2469 const FunctionProtoType *Proto, 2470 Expr **Args, unsigned NumArgs, 2471 SourceLocation RParenLoc) { 2472 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2473 // assignment, to the types of the corresponding parameter, ... 2474 unsigned NumArgsInProto = Proto->getNumArgs(); 2475 unsigned NumArgsToCheck = NumArgs; 2476 bool Invalid = false; 2477 2478 // If too few arguments are available (and we don't have default 2479 // arguments for the remaining parameters), don't make the call. 2480 if (NumArgs < NumArgsInProto) { 2481 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2482 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2483 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2484 // Use default arguments for missing arguments 2485 NumArgsToCheck = NumArgsInProto; 2486 Call->setNumArgs(Context, NumArgsInProto); 2487 } 2488 2489 // If too many are passed and not variadic, error on the extras and drop 2490 // them. 2491 if (NumArgs > NumArgsInProto) { 2492 if (!Proto->isVariadic()) { 2493 Diag(Args[NumArgsInProto]->getLocStart(), 2494 diag::err_typecheck_call_too_many_args) 2495 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2496 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2497 Args[NumArgs-1]->getLocEnd()); 2498 // This deletes the extra arguments. 2499 Call->setNumArgs(Context, NumArgsInProto); 2500 Invalid = true; 2501 } 2502 NumArgsToCheck = NumArgsInProto; 2503 } 2504 2505 // Continue to check argument types (even if we have too few/many args). 2506 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2507 QualType ProtoArgType = Proto->getArgType(i); 2508 2509 Expr *Arg; 2510 if (i < NumArgs) { 2511 Arg = Args[i]; 2512 2513 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2514 ProtoArgType, 2515 diag::err_call_incomplete_argument, 2516 Arg->getSourceRange())) 2517 return true; 2518 2519 // Pass the argument. 2520 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2521 return true; 2522 } else { 2523 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2524 Diag (Call->getSourceRange().getBegin(), 2525 diag::err_use_of_default_argument_to_function_declared_later) << 2526 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2527 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2528 diag::note_default_argument_declared_here); 2529 } else { 2530 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2531 2532 // If the default expression creates temporaries, we need to 2533 // push them to the current stack of expression temporaries so they'll 2534 // be properly destroyed. 2535 if (CXXExprWithTemporaries *E 2536 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2537 assert(!E->shouldDestroyTemporaries() && 2538 "Can't destroy temporaries in a default argument expr!"); 2539 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2540 ExprTemporaries.push_back(E->getTemporary(I)); 2541 } 2542 } 2543 2544 // We already type-checked the argument, so we know it works. 2545 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2546 } 2547 2548 QualType ArgType = Arg->getType(); 2549 2550 Call->setArg(i, Arg); 2551 } 2552 2553 // If this is a variadic call, handle args passed through "...". 2554 if (Proto->isVariadic()) { 2555 VariadicCallType CallType = VariadicFunction; 2556 if (Fn->getType()->isBlockPointerType()) 2557 CallType = VariadicBlock; // Block 2558 else if (isa<MemberExpr>(Fn)) 2559 CallType = VariadicMethod; 2560 2561 // Promote the arguments (C99 6.5.2.2p7). 2562 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2563 Expr *Arg = Args[i]; 2564 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2565 Call->setArg(i, Arg); 2566 } 2567 } 2568 2569 return Invalid; 2570} 2571 2572/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2573/// This provides the location of the left/right parens and a list of comma 2574/// locations. 2575Action::OwningExprResult 2576Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2577 MultiExprArg args, 2578 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2579 unsigned NumArgs = args.size(); 2580 Expr *Fn = fn.takeAs<Expr>(); 2581 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2582 assert(Fn && "no function call expression"); 2583 FunctionDecl *FDecl = NULL; 2584 NamedDecl *NDecl = NULL; 2585 DeclarationName UnqualifiedName; 2586 2587 if (getLangOptions().CPlusPlus) { 2588 // Determine whether this is a dependent call inside a C++ template, 2589 // in which case we won't do any semantic analysis now. 2590 // FIXME: Will need to cache the results of name lookup (including ADL) in 2591 // Fn. 2592 bool Dependent = false; 2593 if (Fn->isTypeDependent()) 2594 Dependent = true; 2595 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2596 Dependent = true; 2597 2598 if (Dependent) 2599 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2600 Context.DependentTy, RParenLoc)); 2601 2602 // Determine whether this is a call to an object (C++ [over.call.object]). 2603 if (Fn->getType()->isRecordType()) 2604 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2605 CommaLocs, RParenLoc)); 2606 2607 // Determine whether this is a call to a member function. 2608 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2609 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2610 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2611 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2612 CommaLocs, RParenLoc)); 2613 } 2614 2615 // If we're directly calling a function, get the appropriate declaration. 2616 DeclRefExpr *DRExpr = NULL; 2617 Expr *FnExpr = Fn; 2618 bool ADL = true; 2619 while (true) { 2620 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2621 FnExpr = IcExpr->getSubExpr(); 2622 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2623 // Parentheses around a function disable ADL 2624 // (C++0x [basic.lookup.argdep]p1). 2625 ADL = false; 2626 FnExpr = PExpr->getSubExpr(); 2627 } else if (isa<UnaryOperator>(FnExpr) && 2628 cast<UnaryOperator>(FnExpr)->getOpcode() 2629 == UnaryOperator::AddrOf) { 2630 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2631 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2632 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2633 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2634 break; 2635 } else if (UnresolvedFunctionNameExpr *DepName 2636 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2637 UnqualifiedName = DepName->getName(); 2638 break; 2639 } else { 2640 // Any kind of name that does not refer to a declaration (or 2641 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2642 ADL = false; 2643 break; 2644 } 2645 } 2646 2647 OverloadedFunctionDecl *Ovl = 0; 2648 if (DRExpr) { 2649 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2650 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2651 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2652 } 2653 2654 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2655 // We don't perform ADL for implicit declarations of builtins. 2656 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2657 ADL = false; 2658 2659 // We don't perform ADL in C. 2660 if (!getLangOptions().CPlusPlus) 2661 ADL = false; 2662 2663 if (Ovl || ADL) { 2664 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2665 UnqualifiedName, LParenLoc, Args, 2666 NumArgs, CommaLocs, RParenLoc, ADL); 2667 if (!FDecl) 2668 return ExprError(); 2669 2670 // Update Fn to refer to the actual function selected. 2671 Expr *NewFn = 0; 2672 if (QualifiedDeclRefExpr *QDRExpr 2673 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2674 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2675 QDRExpr->getLocation(), 2676 false, false, 2677 QDRExpr->getQualifierRange(), 2678 QDRExpr->getQualifier()); 2679 else 2680 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2681 Fn->getSourceRange().getBegin()); 2682 Fn->Destroy(Context); 2683 Fn = NewFn; 2684 } 2685 } 2686 2687 // Promote the function operand. 2688 UsualUnaryConversions(Fn); 2689 2690 // Make the call expr early, before semantic checks. This guarantees cleanup 2691 // of arguments and function on error. 2692 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2693 Args, NumArgs, 2694 Context.BoolTy, 2695 RParenLoc)); 2696 2697 const FunctionType *FuncT; 2698 if (!Fn->getType()->isBlockPointerType()) { 2699 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2700 // have type pointer to function". 2701 const PointerType *PT = Fn->getType()->getAsPointerType(); 2702 if (PT == 0) 2703 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2704 << Fn->getType() << Fn->getSourceRange()); 2705 FuncT = PT->getPointeeType()->getAsFunctionType(); 2706 } else { // This is a block call. 2707 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2708 getAsFunctionType(); 2709 } 2710 if (FuncT == 0) 2711 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2712 << Fn->getType() << Fn->getSourceRange()); 2713 2714 // Check for a valid return type 2715 if (!FuncT->getResultType()->isVoidType() && 2716 RequireCompleteType(Fn->getSourceRange().getBegin(), 2717 FuncT->getResultType(), 2718 diag::err_call_incomplete_return, 2719 TheCall->getSourceRange())) 2720 return ExprError(); 2721 2722 // We know the result type of the call, set it. 2723 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2724 2725 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2726 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2727 RParenLoc)) 2728 return ExprError(); 2729 } else { 2730 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2731 2732 if (FDecl) { 2733 // Check if we have too few/too many template arguments, based 2734 // on our knowledge of the function definition. 2735 const FunctionDecl *Def = 0; 2736 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) { 2737 const FunctionProtoType *Proto = 2738 Def->getType()->getAsFunctionProtoType(); 2739 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2740 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2741 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2742 } 2743 } 2744 } 2745 2746 // Promote the arguments (C99 6.5.2.2p6). 2747 for (unsigned i = 0; i != NumArgs; i++) { 2748 Expr *Arg = Args[i]; 2749 DefaultArgumentPromotion(Arg); 2750 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2751 Arg->getType(), 2752 diag::err_call_incomplete_argument, 2753 Arg->getSourceRange())) 2754 return ExprError(); 2755 TheCall->setArg(i, Arg); 2756 } 2757 } 2758 2759 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2760 if (!Method->isStatic()) 2761 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2762 << Fn->getSourceRange()); 2763 2764 // Check for sentinels 2765 if (NDecl) 2766 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2767 // Do special checking on direct calls to functions. 2768 if (FDecl) 2769 return CheckFunctionCall(FDecl, TheCall.take()); 2770 if (NDecl) 2771 return CheckBlockCall(NDecl, TheCall.take()); 2772 2773 return Owned(TheCall.take()); 2774} 2775 2776Action::OwningExprResult 2777Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2778 SourceLocation RParenLoc, ExprArg InitExpr) { 2779 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2780 QualType literalType = QualType::getFromOpaquePtr(Ty); 2781 // FIXME: put back this assert when initializers are worked out. 2782 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2783 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2784 2785 if (literalType->isArrayType()) { 2786 if (literalType->isVariableArrayType()) 2787 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2788 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2789 } else if (!literalType->isDependentType() && 2790 RequireCompleteType(LParenLoc, literalType, 2791 diag::err_typecheck_decl_incomplete_type, 2792 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2793 return ExprError(); 2794 2795 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2796 DeclarationName(), /*FIXME:DirectInit=*/false)) 2797 return ExprError(); 2798 2799 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2800 if (isFileScope) { // 6.5.2.5p3 2801 if (CheckForConstantInitializer(literalExpr, literalType)) 2802 return ExprError(); 2803 } 2804 InitExpr.release(); 2805 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2806 literalExpr, isFileScope)); 2807} 2808 2809Action::OwningExprResult 2810Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2811 SourceLocation RBraceLoc) { 2812 unsigned NumInit = initlist.size(); 2813 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2814 2815 // Semantic analysis for initializers is done by ActOnDeclarator() and 2816 // CheckInitializer() - it requires knowledge of the object being intialized. 2817 2818 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2819 RBraceLoc); 2820 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2821 return Owned(E); 2822} 2823 2824/// CheckCastTypes - Check type constraints for casting between types. 2825bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2826 UsualUnaryConversions(castExpr); 2827 2828 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2829 // type needs to be scalar. 2830 if (castType->isVoidType()) { 2831 // Cast to void allows any expr type. 2832 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2833 // We can't check any more until template instantiation time. 2834 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2835 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2836 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2837 (castType->isStructureType() || castType->isUnionType())) { 2838 // GCC struct/union extension: allow cast to self. 2839 // FIXME: Check that the cast destination type is complete. 2840 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2841 << castType << castExpr->getSourceRange(); 2842 } else if (castType->isUnionType()) { 2843 // GCC cast to union extension 2844 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2845 RecordDecl::field_iterator Field, FieldEnd; 2846 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2847 Field != FieldEnd; ++Field) { 2848 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2849 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2850 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2851 << castExpr->getSourceRange(); 2852 break; 2853 } 2854 } 2855 if (Field == FieldEnd) 2856 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2857 << castExpr->getType() << castExpr->getSourceRange(); 2858 } else { 2859 // Reject any other conversions to non-scalar types. 2860 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2861 << castType << castExpr->getSourceRange(); 2862 } 2863 } else if (!castExpr->getType()->isScalarType() && 2864 !castExpr->getType()->isVectorType()) { 2865 return Diag(castExpr->getLocStart(), 2866 diag::err_typecheck_expect_scalar_operand) 2867 << castExpr->getType() << castExpr->getSourceRange(); 2868 } else if (castExpr->getType()->isVectorType()) { 2869 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2870 return true; 2871 } else if (castType->isVectorType()) { 2872 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2873 return true; 2874 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2875 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2876 } else if (!castType->isArithmeticType()) { 2877 QualType castExprType = castExpr->getType(); 2878 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2879 return Diag(castExpr->getLocStart(), 2880 diag::err_cast_pointer_from_non_pointer_int) 2881 << castExprType << castExpr->getSourceRange(); 2882 } else if (!castExpr->getType()->isArithmeticType()) { 2883 if (!castType->isIntegralType() && castType->isArithmeticType()) 2884 return Diag(castExpr->getLocStart(), 2885 diag::err_cast_pointer_to_non_pointer_int) 2886 << castType << castExpr->getSourceRange(); 2887 } 2888 if (isa<ObjCSelectorExpr>(castExpr)) 2889 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2890 return false; 2891} 2892 2893bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2894 assert(VectorTy->isVectorType() && "Not a vector type!"); 2895 2896 if (Ty->isVectorType() || Ty->isIntegerType()) { 2897 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2898 return Diag(R.getBegin(), 2899 Ty->isVectorType() ? 2900 diag::err_invalid_conversion_between_vectors : 2901 diag::err_invalid_conversion_between_vector_and_integer) 2902 << VectorTy << Ty << R; 2903 } else 2904 return Diag(R.getBegin(), 2905 diag::err_invalid_conversion_between_vector_and_scalar) 2906 << VectorTy << Ty << R; 2907 2908 return false; 2909} 2910 2911Action::OwningExprResult 2912Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2913 SourceLocation RParenLoc, ExprArg Op) { 2914 assert((Ty != 0) && (Op.get() != 0) && 2915 "ActOnCastExpr(): missing type or expr"); 2916 2917 Expr *castExpr = Op.takeAs<Expr>(); 2918 QualType castType = QualType::getFromOpaquePtr(Ty); 2919 2920 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2921 return ExprError(); 2922 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2923 LParenLoc, RParenLoc)); 2924} 2925 2926/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2927/// In that case, lhs = cond. 2928/// C99 6.5.15 2929QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2930 SourceLocation QuestionLoc) { 2931 // C++ is sufficiently different to merit its own checker. 2932 if (getLangOptions().CPlusPlus) 2933 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2934 2935 UsualUnaryConversions(Cond); 2936 UsualUnaryConversions(LHS); 2937 UsualUnaryConversions(RHS); 2938 QualType CondTy = Cond->getType(); 2939 QualType LHSTy = LHS->getType(); 2940 QualType RHSTy = RHS->getType(); 2941 2942 // first, check the condition. 2943 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2944 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2945 << CondTy; 2946 return QualType(); 2947 } 2948 2949 // Now check the two expressions. 2950 2951 // If both operands have arithmetic type, do the usual arithmetic conversions 2952 // to find a common type: C99 6.5.15p3,5. 2953 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2954 UsualArithmeticConversions(LHS, RHS); 2955 return LHS->getType(); 2956 } 2957 2958 // If both operands are the same structure or union type, the result is that 2959 // type. 2960 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2961 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2962 if (LHSRT->getDecl() == RHSRT->getDecl()) 2963 // "If both the operands have structure or union type, the result has 2964 // that type." This implies that CV qualifiers are dropped. 2965 return LHSTy.getUnqualifiedType(); 2966 // FIXME: Type of conditional expression must be complete in C mode. 2967 } 2968 2969 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2970 // The following || allows only one side to be void (a GCC-ism). 2971 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2972 if (!LHSTy->isVoidType()) 2973 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2974 << RHS->getSourceRange(); 2975 if (!RHSTy->isVoidType()) 2976 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2977 << LHS->getSourceRange(); 2978 ImpCastExprToType(LHS, Context.VoidTy); 2979 ImpCastExprToType(RHS, Context.VoidTy); 2980 return Context.VoidTy; 2981 } 2982 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2983 // the type of the other operand." 2984 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2985 Context.isObjCObjectPointerType(LHSTy)) && 2986 RHS->isNullPointerConstant(Context)) { 2987 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2988 return LHSTy; 2989 } 2990 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2991 Context.isObjCObjectPointerType(RHSTy)) && 2992 LHS->isNullPointerConstant(Context)) { 2993 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2994 return RHSTy; 2995 } 2996 2997 const PointerType *LHSPT = LHSTy->getAsPointerType(); 2998 const PointerType *RHSPT = RHSTy->getAsPointerType(); 2999 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 3000 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); 3001 3002 // Handle the case where both operands are pointers before we handle null 3003 // pointer constants in case both operands are null pointer constants. 3004 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 3005 // get the "pointed to" types 3006 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 3007 : LHSBPT->getPointeeType()); 3008 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 3009 : RHSBPT->getPointeeType()); 3010 3011 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3012 if (lhptee->isVoidType() 3013 && (RHSBPT || rhptee->isIncompleteOrObjectType())) { 3014 // Figure out necessary qualifiers (C99 6.5.15p6) 3015 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3016 QualType destType = Context.getPointerType(destPointee); 3017 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3018 ImpCastExprToType(RHS, destType); // promote to void* 3019 return destType; 3020 } 3021 if (rhptee->isVoidType() 3022 && (LHSBPT || lhptee->isIncompleteOrObjectType())) { 3023 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3024 QualType destType = Context.getPointerType(destPointee); 3025 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3026 ImpCastExprToType(RHS, destType); // promote to void* 3027 return destType; 3028 } 3029 3030 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 3031 if (sameKind 3032 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3033 // Two identical pointer types are always compatible. 3034 return LHSTy; 3035 } 3036 3037 QualType compositeType = LHSTy; 3038 3039 // If either type is an Objective-C object type then check 3040 // compatibility according to Objective-C. 3041 if (Context.isObjCObjectPointerType(LHSTy) || 3042 Context.isObjCObjectPointerType(RHSTy)) { 3043 // If both operands are interfaces and either operand can be 3044 // assigned to the other, use that type as the composite 3045 // type. This allows 3046 // xxx ? (A*) a : (B*) b 3047 // where B is a subclass of A. 3048 // 3049 // Additionally, as for assignment, if either type is 'id' 3050 // allow silent coercion. Finally, if the types are 3051 // incompatible then make sure to use 'id' as the composite 3052 // type so the result is acceptable for sending messages to. 3053 3054 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3055 // It could return the composite type. 3056 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3057 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3058 if (LHSIface && RHSIface && 3059 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3060 compositeType = LHSTy; 3061 } else if (LHSIface && RHSIface && 3062 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3063 compositeType = RHSTy; 3064 } else if (Context.isObjCIdStructType(lhptee) || 3065 Context.isObjCIdStructType(rhptee)) { 3066 compositeType = Context.getObjCIdType(); 3067 } else if (LHSBPT || RHSBPT) { 3068 if (!sameKind 3069 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3070 rhptee.getUnqualifiedType())) 3071 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3072 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3073 return QualType(); 3074 } else { 3075 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3076 << LHSTy << RHSTy 3077 << LHS->getSourceRange() << RHS->getSourceRange(); 3078 QualType incompatTy = Context.getObjCIdType(); 3079 ImpCastExprToType(LHS, incompatTy); 3080 ImpCastExprToType(RHS, incompatTy); 3081 return incompatTy; 3082 } 3083 } else if (!sameKind 3084 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3085 rhptee.getUnqualifiedType())) { 3086 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3087 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3088 // In this situation, we assume void* type. No especially good 3089 // reason, but this is what gcc does, and we do have to pick 3090 // to get a consistent AST. 3091 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3092 ImpCastExprToType(LHS, incompatTy); 3093 ImpCastExprToType(RHS, incompatTy); 3094 return incompatTy; 3095 } 3096 // The pointer types are compatible. 3097 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3098 // differently qualified versions of compatible types, the result type is 3099 // a pointer to an appropriately qualified version of the *composite* 3100 // type. 3101 // FIXME: Need to calculate the composite type. 3102 // FIXME: Need to add qualifiers 3103 ImpCastExprToType(LHS, compositeType); 3104 ImpCastExprToType(RHS, compositeType); 3105 return compositeType; 3106 } 3107 3108 // GCC compatibility: soften pointer/integer mismatch. 3109 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3110 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3111 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3112 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3113 return RHSTy; 3114 } 3115 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3116 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3117 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3118 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3119 return LHSTy; 3120 } 3121 3122 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3123 // evaluates to "struct objc_object *" (and is handled above when comparing 3124 // id with statically typed objects). 3125 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3126 // GCC allows qualified id and any Objective-C type to devolve to 3127 // id. Currently localizing to here until clear this should be 3128 // part of ObjCQualifiedIdTypesAreCompatible. 3129 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3130 (LHSTy->isObjCQualifiedIdType() && 3131 Context.isObjCObjectPointerType(RHSTy)) || 3132 (RHSTy->isObjCQualifiedIdType() && 3133 Context.isObjCObjectPointerType(LHSTy))) { 3134 // FIXME: This is not the correct composite type. This only happens to 3135 // work because id can more or less be used anywhere, however this may 3136 // change the type of method sends. 3137 3138 // FIXME: gcc adds some type-checking of the arguments and emits 3139 // (confusing) incompatible comparison warnings in some 3140 // cases. Investigate. 3141 QualType compositeType = Context.getObjCIdType(); 3142 ImpCastExprToType(LHS, compositeType); 3143 ImpCastExprToType(RHS, compositeType); 3144 return compositeType; 3145 } 3146 } 3147 3148 // Otherwise, the operands are not compatible. 3149 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3150 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3151 return QualType(); 3152} 3153 3154/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3155/// in the case of a the GNU conditional expr extension. 3156Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3157 SourceLocation ColonLoc, 3158 ExprArg Cond, ExprArg LHS, 3159 ExprArg RHS) { 3160 Expr *CondExpr = (Expr *) Cond.get(); 3161 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3162 3163 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3164 // was the condition. 3165 bool isLHSNull = LHSExpr == 0; 3166 if (isLHSNull) 3167 LHSExpr = CondExpr; 3168 3169 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3170 RHSExpr, QuestionLoc); 3171 if (result.isNull()) 3172 return ExprError(); 3173 3174 Cond.release(); 3175 LHS.release(); 3176 RHS.release(); 3177 return Owned(new (Context) ConditionalOperator(CondExpr, 3178 isLHSNull ? 0 : LHSExpr, 3179 RHSExpr, result)); 3180} 3181 3182 3183// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3184// being closely modeled after the C99 spec:-). The odd characteristic of this 3185// routine is it effectively iqnores the qualifiers on the top level pointee. 3186// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3187// FIXME: add a couple examples in this comment. 3188Sema::AssignConvertType 3189Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3190 QualType lhptee, rhptee; 3191 3192 // get the "pointed to" type (ignoring qualifiers at the top level) 3193 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3194 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3195 3196 // make sure we operate on the canonical type 3197 lhptee = Context.getCanonicalType(lhptee); 3198 rhptee = Context.getCanonicalType(rhptee); 3199 3200 AssignConvertType ConvTy = Compatible; 3201 3202 // C99 6.5.16.1p1: This following citation is common to constraints 3203 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3204 // qualifiers of the type *pointed to* by the right; 3205 // FIXME: Handle ExtQualType 3206 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3207 ConvTy = CompatiblePointerDiscardsQualifiers; 3208 3209 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3210 // incomplete type and the other is a pointer to a qualified or unqualified 3211 // version of void... 3212 if (lhptee->isVoidType()) { 3213 if (rhptee->isIncompleteOrObjectType()) 3214 return ConvTy; 3215 3216 // As an extension, we allow cast to/from void* to function pointer. 3217 assert(rhptee->isFunctionType()); 3218 return FunctionVoidPointer; 3219 } 3220 3221 if (rhptee->isVoidType()) { 3222 if (lhptee->isIncompleteOrObjectType()) 3223 return ConvTy; 3224 3225 // As an extension, we allow cast to/from void* to function pointer. 3226 assert(lhptee->isFunctionType()); 3227 return FunctionVoidPointer; 3228 } 3229 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3230 // unqualified versions of compatible types, ... 3231 lhptee = lhptee.getUnqualifiedType(); 3232 rhptee = rhptee.getUnqualifiedType(); 3233 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3234 // Check if the pointee types are compatible ignoring the sign. 3235 // We explicitly check for char so that we catch "char" vs 3236 // "unsigned char" on systems where "char" is unsigned. 3237 if (lhptee->isCharType()) { 3238 lhptee = Context.UnsignedCharTy; 3239 } else if (lhptee->isSignedIntegerType()) { 3240 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3241 } 3242 if (rhptee->isCharType()) { 3243 rhptee = Context.UnsignedCharTy; 3244 } else if (rhptee->isSignedIntegerType()) { 3245 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3246 } 3247 if (lhptee == rhptee) { 3248 // Types are compatible ignoring the sign. Qualifier incompatibility 3249 // takes priority over sign incompatibility because the sign 3250 // warning can be disabled. 3251 if (ConvTy != Compatible) 3252 return ConvTy; 3253 return IncompatiblePointerSign; 3254 } 3255 // General pointer incompatibility takes priority over qualifiers. 3256 return IncompatiblePointer; 3257 } 3258 return ConvTy; 3259} 3260 3261/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3262/// block pointer types are compatible or whether a block and normal pointer 3263/// are compatible. It is more restrict than comparing two function pointer 3264// types. 3265Sema::AssignConvertType 3266Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3267 QualType rhsType) { 3268 QualType lhptee, rhptee; 3269 3270 // get the "pointed to" type (ignoring qualifiers at the top level) 3271 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3272 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3273 3274 // make sure we operate on the canonical type 3275 lhptee = Context.getCanonicalType(lhptee); 3276 rhptee = Context.getCanonicalType(rhptee); 3277 3278 AssignConvertType ConvTy = Compatible; 3279 3280 // For blocks we enforce that qualifiers are identical. 3281 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3282 ConvTy = CompatiblePointerDiscardsQualifiers; 3283 3284 if (!Context.typesAreCompatible(lhptee, rhptee)) 3285 return IncompatibleBlockPointer; 3286 return ConvTy; 3287} 3288 3289/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3290/// has code to accommodate several GCC extensions when type checking 3291/// pointers. Here are some objectionable examples that GCC considers warnings: 3292/// 3293/// int a, *pint; 3294/// short *pshort; 3295/// struct foo *pfoo; 3296/// 3297/// pint = pshort; // warning: assignment from incompatible pointer type 3298/// a = pint; // warning: assignment makes integer from pointer without a cast 3299/// pint = a; // warning: assignment makes pointer from integer without a cast 3300/// pint = pfoo; // warning: assignment from incompatible pointer type 3301/// 3302/// As a result, the code for dealing with pointers is more complex than the 3303/// C99 spec dictates. 3304/// 3305Sema::AssignConvertType 3306Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3307 // Get canonical types. We're not formatting these types, just comparing 3308 // them. 3309 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3310 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3311 3312 if (lhsType == rhsType) 3313 return Compatible; // Common case: fast path an exact match. 3314 3315 // If the left-hand side is a reference type, then we are in a 3316 // (rare!) case where we've allowed the use of references in C, 3317 // e.g., as a parameter type in a built-in function. In this case, 3318 // just make sure that the type referenced is compatible with the 3319 // right-hand side type. The caller is responsible for adjusting 3320 // lhsType so that the resulting expression does not have reference 3321 // type. 3322 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3323 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3324 return Compatible; 3325 return Incompatible; 3326 } 3327 3328 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3329 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3330 return Compatible; 3331 // Relax integer conversions like we do for pointers below. 3332 if (rhsType->isIntegerType()) 3333 return IntToPointer; 3334 if (lhsType->isIntegerType()) 3335 return PointerToInt; 3336 return IncompatibleObjCQualifiedId; 3337 } 3338 3339 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3340 // For ExtVector, allow vector splats; float -> <n x float> 3341 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3342 if (LV->getElementType() == rhsType) 3343 return Compatible; 3344 3345 // If we are allowing lax vector conversions, and LHS and RHS are both 3346 // vectors, the total size only needs to be the same. This is a bitcast; 3347 // no bits are changed but the result type is different. 3348 if (getLangOptions().LaxVectorConversions && 3349 lhsType->isVectorType() && rhsType->isVectorType()) { 3350 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3351 return IncompatibleVectors; 3352 } 3353 return Incompatible; 3354 } 3355 3356 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3357 return Compatible; 3358 3359 if (isa<PointerType>(lhsType)) { 3360 if (rhsType->isIntegerType()) 3361 return IntToPointer; 3362 3363 if (isa<PointerType>(rhsType)) 3364 return CheckPointerTypesForAssignment(lhsType, rhsType); 3365 3366 if (rhsType->getAsBlockPointerType()) { 3367 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3368 return Compatible; 3369 3370 // Treat block pointers as objects. 3371 if (getLangOptions().ObjC1 && 3372 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3373 return Compatible; 3374 } 3375 return Incompatible; 3376 } 3377 3378 if (isa<BlockPointerType>(lhsType)) { 3379 if (rhsType->isIntegerType()) 3380 return IntToBlockPointer; 3381 3382 // Treat block pointers as objects. 3383 if (getLangOptions().ObjC1 && 3384 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3385 return Compatible; 3386 3387 if (rhsType->isBlockPointerType()) 3388 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3389 3390 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3391 if (RHSPT->getPointeeType()->isVoidType()) 3392 return Compatible; 3393 } 3394 return Incompatible; 3395 } 3396 3397 if (isa<PointerType>(rhsType)) { 3398 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3399 if (lhsType == Context.BoolTy) 3400 return Compatible; 3401 3402 if (lhsType->isIntegerType()) 3403 return PointerToInt; 3404 3405 if (isa<PointerType>(lhsType)) 3406 return CheckPointerTypesForAssignment(lhsType, rhsType); 3407 3408 if (isa<BlockPointerType>(lhsType) && 3409 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3410 return Compatible; 3411 return Incompatible; 3412 } 3413 3414 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3415 if (Context.typesAreCompatible(lhsType, rhsType)) 3416 return Compatible; 3417 } 3418 return Incompatible; 3419} 3420 3421/// \brief Constructs a transparent union from an expression that is 3422/// used to initialize the transparent union. 3423static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3424 QualType UnionType, FieldDecl *Field) { 3425 // Build an initializer list that designates the appropriate member 3426 // of the transparent union. 3427 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3428 &E, 1, 3429 SourceLocation()); 3430 Initializer->setType(UnionType); 3431 Initializer->setInitializedFieldInUnion(Field); 3432 3433 // Build a compound literal constructing a value of the transparent 3434 // union type from this initializer list. 3435 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3436 false); 3437} 3438 3439Sema::AssignConvertType 3440Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3441 QualType FromType = rExpr->getType(); 3442 3443 // If the ArgType is a Union type, we want to handle a potential 3444 // transparent_union GCC extension. 3445 const RecordType *UT = ArgType->getAsUnionType(); 3446 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>(Context)) 3447 return Incompatible; 3448 3449 // The field to initialize within the transparent union. 3450 RecordDecl *UD = UT->getDecl(); 3451 FieldDecl *InitField = 0; 3452 // It's compatible if the expression matches any of the fields. 3453 for (RecordDecl::field_iterator it = UD->field_begin(Context), 3454 itend = UD->field_end(Context); 3455 it != itend; ++it) { 3456 if (it->getType()->isPointerType()) { 3457 // If the transparent union contains a pointer type, we allow: 3458 // 1) void pointer 3459 // 2) null pointer constant 3460 if (FromType->isPointerType()) 3461 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3462 ImpCastExprToType(rExpr, it->getType()); 3463 InitField = *it; 3464 break; 3465 } 3466 3467 if (rExpr->isNullPointerConstant(Context)) { 3468 ImpCastExprToType(rExpr, it->getType()); 3469 InitField = *it; 3470 break; 3471 } 3472 } 3473 3474 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3475 == Compatible) { 3476 InitField = *it; 3477 break; 3478 } 3479 } 3480 3481 if (!InitField) 3482 return Incompatible; 3483 3484 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3485 return Compatible; 3486} 3487 3488Sema::AssignConvertType 3489Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3490 if (getLangOptions().CPlusPlus) { 3491 if (!lhsType->isRecordType()) { 3492 // C++ 5.17p3: If the left operand is not of class type, the 3493 // expression is implicitly converted (C++ 4) to the 3494 // cv-unqualified type of the left operand. 3495 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3496 "assigning")) 3497 return Incompatible; 3498 return Compatible; 3499 } 3500 3501 // FIXME: Currently, we fall through and treat C++ classes like C 3502 // structures. 3503 } 3504 3505 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3506 // a null pointer constant. 3507 if ((lhsType->isPointerType() || 3508 lhsType->isObjCQualifiedIdType() || 3509 lhsType->isBlockPointerType()) 3510 && rExpr->isNullPointerConstant(Context)) { 3511 ImpCastExprToType(rExpr, lhsType); 3512 return Compatible; 3513 } 3514 3515 // This check seems unnatural, however it is necessary to ensure the proper 3516 // conversion of functions/arrays. If the conversion were done for all 3517 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3518 // expressions that surpress this implicit conversion (&, sizeof). 3519 // 3520 // Suppress this for references: C++ 8.5.3p5. 3521 if (!lhsType->isReferenceType()) 3522 DefaultFunctionArrayConversion(rExpr); 3523 3524 Sema::AssignConvertType result = 3525 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3526 3527 // C99 6.5.16.1p2: The value of the right operand is converted to the 3528 // type of the assignment expression. 3529 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3530 // so that we can use references in built-in functions even in C. 3531 // The getNonReferenceType() call makes sure that the resulting expression 3532 // does not have reference type. 3533 if (result != Incompatible && rExpr->getType() != lhsType) 3534 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3535 return result; 3536} 3537 3538QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3539 Diag(Loc, diag::err_typecheck_invalid_operands) 3540 << lex->getType() << rex->getType() 3541 << lex->getSourceRange() << rex->getSourceRange(); 3542 return QualType(); 3543} 3544 3545inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3546 Expr *&rex) { 3547 // For conversion purposes, we ignore any qualifiers. 3548 // For example, "const float" and "float" are equivalent. 3549 QualType lhsType = 3550 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3551 QualType rhsType = 3552 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3553 3554 // If the vector types are identical, return. 3555 if (lhsType == rhsType) 3556 return lhsType; 3557 3558 // Handle the case of a vector & extvector type of the same size and element 3559 // type. It would be nice if we only had one vector type someday. 3560 if (getLangOptions().LaxVectorConversions) { 3561 // FIXME: Should we warn here? 3562 if (const VectorType *LV = lhsType->getAsVectorType()) { 3563 if (const VectorType *RV = rhsType->getAsVectorType()) 3564 if (LV->getElementType() == RV->getElementType() && 3565 LV->getNumElements() == RV->getNumElements()) { 3566 return lhsType->isExtVectorType() ? lhsType : rhsType; 3567 } 3568 } 3569 } 3570 3571 // If the lhs is an extended vector and the rhs is a scalar of the same type 3572 // or a literal, promote the rhs to the vector type. 3573 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3574 QualType eltType = V->getElementType(); 3575 3576 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3577 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3578 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3579 ImpCastExprToType(rex, lhsType); 3580 return lhsType; 3581 } 3582 } 3583 3584 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3585 // promote the lhs to the vector type. 3586 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3587 QualType eltType = V->getElementType(); 3588 3589 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3590 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3591 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3592 ImpCastExprToType(lex, rhsType); 3593 return rhsType; 3594 } 3595 } 3596 3597 // You cannot convert between vector values of different size. 3598 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3599 << lex->getType() << rex->getType() 3600 << lex->getSourceRange() << rex->getSourceRange(); 3601 return QualType(); 3602} 3603 3604inline QualType Sema::CheckMultiplyDivideOperands( 3605 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3606{ 3607 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3608 return CheckVectorOperands(Loc, lex, rex); 3609 3610 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3611 3612 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3613 return compType; 3614 return InvalidOperands(Loc, lex, rex); 3615} 3616 3617inline QualType Sema::CheckRemainderOperands( 3618 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3619{ 3620 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3621 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3622 return CheckVectorOperands(Loc, lex, rex); 3623 return InvalidOperands(Loc, lex, rex); 3624 } 3625 3626 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3627 3628 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3629 return compType; 3630 return InvalidOperands(Loc, lex, rex); 3631} 3632 3633inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3634 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3635{ 3636 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3637 QualType compType = CheckVectorOperands(Loc, lex, rex); 3638 if (CompLHSTy) *CompLHSTy = compType; 3639 return compType; 3640 } 3641 3642 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3643 3644 // handle the common case first (both operands are arithmetic). 3645 if (lex->getType()->isArithmeticType() && 3646 rex->getType()->isArithmeticType()) { 3647 if (CompLHSTy) *CompLHSTy = compType; 3648 return compType; 3649 } 3650 3651 // Put any potential pointer into PExp 3652 Expr* PExp = lex, *IExp = rex; 3653 if (IExp->getType()->isPointerType()) 3654 std::swap(PExp, IExp); 3655 3656 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3657 if (IExp->getType()->isIntegerType()) { 3658 QualType PointeeTy = PTy->getPointeeType(); 3659 // Check for arithmetic on pointers to incomplete types. 3660 if (PointeeTy->isVoidType()) { 3661 if (getLangOptions().CPlusPlus) { 3662 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3663 << lex->getSourceRange() << rex->getSourceRange(); 3664 return QualType(); 3665 } 3666 3667 // GNU extension: arithmetic on pointer to void 3668 Diag(Loc, diag::ext_gnu_void_ptr) 3669 << lex->getSourceRange() << rex->getSourceRange(); 3670 } else if (PointeeTy->isFunctionType()) { 3671 if (getLangOptions().CPlusPlus) { 3672 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3673 << lex->getType() << lex->getSourceRange(); 3674 return QualType(); 3675 } 3676 3677 // GNU extension: arithmetic on pointer to function 3678 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3679 << lex->getType() << lex->getSourceRange(); 3680 } else if (!PTy->isDependentType() && 3681 RequireCompleteType(Loc, PointeeTy, 3682 diag::err_typecheck_arithmetic_incomplete_type, 3683 PExp->getSourceRange(), SourceRange(), 3684 PExp->getType())) 3685 return QualType(); 3686 3687 // Diagnose bad cases where we step over interface counts. 3688 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3689 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3690 << PointeeTy << PExp->getSourceRange(); 3691 return QualType(); 3692 } 3693 3694 if (CompLHSTy) { 3695 QualType LHSTy = lex->getType(); 3696 if (LHSTy->isPromotableIntegerType()) 3697 LHSTy = Context.IntTy; 3698 else { 3699 QualType T = isPromotableBitField(lex, Context); 3700 if (!T.isNull()) 3701 LHSTy = T; 3702 } 3703 3704 *CompLHSTy = LHSTy; 3705 } 3706 return PExp->getType(); 3707 } 3708 } 3709 3710 return InvalidOperands(Loc, lex, rex); 3711} 3712 3713// C99 6.5.6 3714QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3715 SourceLocation Loc, QualType* CompLHSTy) { 3716 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3717 QualType compType = CheckVectorOperands(Loc, lex, rex); 3718 if (CompLHSTy) *CompLHSTy = compType; 3719 return compType; 3720 } 3721 3722 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3723 3724 // Enforce type constraints: C99 6.5.6p3. 3725 3726 // Handle the common case first (both operands are arithmetic). 3727 if (lex->getType()->isArithmeticType() 3728 && rex->getType()->isArithmeticType()) { 3729 if (CompLHSTy) *CompLHSTy = compType; 3730 return compType; 3731 } 3732 3733 // Either ptr - int or ptr - ptr. 3734 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3735 QualType lpointee = LHSPTy->getPointeeType(); 3736 3737 // The LHS must be an completely-defined object type. 3738 3739 bool ComplainAboutVoid = false; 3740 Expr *ComplainAboutFunc = 0; 3741 if (lpointee->isVoidType()) { 3742 if (getLangOptions().CPlusPlus) { 3743 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3744 << lex->getSourceRange() << rex->getSourceRange(); 3745 return QualType(); 3746 } 3747 3748 // GNU C extension: arithmetic on pointer to void 3749 ComplainAboutVoid = true; 3750 } else if (lpointee->isFunctionType()) { 3751 if (getLangOptions().CPlusPlus) { 3752 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3753 << lex->getType() << lex->getSourceRange(); 3754 return QualType(); 3755 } 3756 3757 // GNU C extension: arithmetic on pointer to function 3758 ComplainAboutFunc = lex; 3759 } else if (!lpointee->isDependentType() && 3760 RequireCompleteType(Loc, lpointee, 3761 diag::err_typecheck_sub_ptr_object, 3762 lex->getSourceRange(), 3763 SourceRange(), 3764 lex->getType())) 3765 return QualType(); 3766 3767 // Diagnose bad cases where we step over interface counts. 3768 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3769 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3770 << lpointee << lex->getSourceRange(); 3771 return QualType(); 3772 } 3773 3774 // The result type of a pointer-int computation is the pointer type. 3775 if (rex->getType()->isIntegerType()) { 3776 if (ComplainAboutVoid) 3777 Diag(Loc, diag::ext_gnu_void_ptr) 3778 << lex->getSourceRange() << rex->getSourceRange(); 3779 if (ComplainAboutFunc) 3780 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3781 << ComplainAboutFunc->getType() 3782 << ComplainAboutFunc->getSourceRange(); 3783 3784 if (CompLHSTy) *CompLHSTy = lex->getType(); 3785 return lex->getType(); 3786 } 3787 3788 // Handle pointer-pointer subtractions. 3789 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3790 QualType rpointee = RHSPTy->getPointeeType(); 3791 3792 // RHS must be a completely-type object type. 3793 // Handle the GNU void* extension. 3794 if (rpointee->isVoidType()) { 3795 if (getLangOptions().CPlusPlus) { 3796 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3797 << lex->getSourceRange() << rex->getSourceRange(); 3798 return QualType(); 3799 } 3800 3801 ComplainAboutVoid = true; 3802 } else if (rpointee->isFunctionType()) { 3803 if (getLangOptions().CPlusPlus) { 3804 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3805 << rex->getType() << rex->getSourceRange(); 3806 return QualType(); 3807 } 3808 3809 // GNU extension: arithmetic on pointer to function 3810 if (!ComplainAboutFunc) 3811 ComplainAboutFunc = rex; 3812 } else if (!rpointee->isDependentType() && 3813 RequireCompleteType(Loc, rpointee, 3814 diag::err_typecheck_sub_ptr_object, 3815 rex->getSourceRange(), 3816 SourceRange(), 3817 rex->getType())) 3818 return QualType(); 3819 3820 if (getLangOptions().CPlusPlus) { 3821 // Pointee types must be the same: C++ [expr.add] 3822 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3823 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3824 << lex->getType() << rex->getType() 3825 << lex->getSourceRange() << rex->getSourceRange(); 3826 return QualType(); 3827 } 3828 } else { 3829 // Pointee types must be compatible C99 6.5.6p3 3830 if (!Context.typesAreCompatible( 3831 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3832 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3833 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3834 << lex->getType() << rex->getType() 3835 << lex->getSourceRange() << rex->getSourceRange(); 3836 return QualType(); 3837 } 3838 } 3839 3840 if (ComplainAboutVoid) 3841 Diag(Loc, diag::ext_gnu_void_ptr) 3842 << lex->getSourceRange() << rex->getSourceRange(); 3843 if (ComplainAboutFunc) 3844 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3845 << ComplainAboutFunc->getType() 3846 << ComplainAboutFunc->getSourceRange(); 3847 3848 if (CompLHSTy) *CompLHSTy = lex->getType(); 3849 return Context.getPointerDiffType(); 3850 } 3851 } 3852 3853 return InvalidOperands(Loc, lex, rex); 3854} 3855 3856// C99 6.5.7 3857QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3858 bool isCompAssign) { 3859 // C99 6.5.7p2: Each of the operands shall have integer type. 3860 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3861 return InvalidOperands(Loc, lex, rex); 3862 3863 // Shifts don't perform usual arithmetic conversions, they just do integer 3864 // promotions on each operand. C99 6.5.7p3 3865 QualType LHSTy; 3866 if (lex->getType()->isPromotableIntegerType()) 3867 LHSTy = Context.IntTy; 3868 else { 3869 LHSTy = isPromotableBitField(lex, Context); 3870 if (LHSTy.isNull()) 3871 LHSTy = lex->getType(); 3872 } 3873 if (!isCompAssign) 3874 ImpCastExprToType(lex, LHSTy); 3875 3876 UsualUnaryConversions(rex); 3877 3878 // "The type of the result is that of the promoted left operand." 3879 return LHSTy; 3880} 3881 3882// C99 6.5.8, C++ [expr.rel] 3883QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3884 unsigned OpaqueOpc, bool isRelational) { 3885 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3886 3887 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3888 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3889 3890 // C99 6.5.8p3 / C99 6.5.9p4 3891 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3892 UsualArithmeticConversions(lex, rex); 3893 else { 3894 UsualUnaryConversions(lex); 3895 UsualUnaryConversions(rex); 3896 } 3897 QualType lType = lex->getType(); 3898 QualType rType = rex->getType(); 3899 3900 if (!lType->isFloatingType() 3901 && !(lType->isBlockPointerType() && isRelational)) { 3902 // For non-floating point types, check for self-comparisons of the form 3903 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3904 // often indicate logic errors in the program. 3905 // NOTE: Don't warn about comparisons of enum constants. These can arise 3906 // from macro expansions, and are usually quite deliberate. 3907 Expr *LHSStripped = lex->IgnoreParens(); 3908 Expr *RHSStripped = rex->IgnoreParens(); 3909 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3910 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3911 if (DRL->getDecl() == DRR->getDecl() && 3912 !isa<EnumConstantDecl>(DRL->getDecl())) 3913 Diag(Loc, diag::warn_selfcomparison); 3914 3915 if (isa<CastExpr>(LHSStripped)) 3916 LHSStripped = LHSStripped->IgnoreParenCasts(); 3917 if (isa<CastExpr>(RHSStripped)) 3918 RHSStripped = RHSStripped->IgnoreParenCasts(); 3919 3920 // Warn about comparisons against a string constant (unless the other 3921 // operand is null), the user probably wants strcmp. 3922 Expr *literalString = 0; 3923 Expr *literalStringStripped = 0; 3924 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3925 !RHSStripped->isNullPointerConstant(Context)) { 3926 literalString = lex; 3927 literalStringStripped = LHSStripped; 3928 } 3929 else if ((isa<StringLiteral>(RHSStripped) || 3930 isa<ObjCEncodeExpr>(RHSStripped)) && 3931 !LHSStripped->isNullPointerConstant(Context)) { 3932 literalString = rex; 3933 literalStringStripped = RHSStripped; 3934 } 3935 3936 if (literalString) { 3937 std::string resultComparison; 3938 switch (Opc) { 3939 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3940 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3941 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3942 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3943 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3944 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3945 default: assert(false && "Invalid comparison operator"); 3946 } 3947 Diag(Loc, diag::warn_stringcompare) 3948 << isa<ObjCEncodeExpr>(literalStringStripped) 3949 << literalString->getSourceRange() 3950 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3951 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3952 "strcmp(") 3953 << CodeModificationHint::CreateInsertion( 3954 PP.getLocForEndOfToken(rex->getLocEnd()), 3955 resultComparison); 3956 } 3957 } 3958 3959 // The result of comparisons is 'bool' in C++, 'int' in C. 3960 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3961 3962 if (isRelational) { 3963 if (lType->isRealType() && rType->isRealType()) 3964 return ResultTy; 3965 } else { 3966 // Check for comparisons of floating point operands using != and ==. 3967 if (lType->isFloatingType()) { 3968 assert(rType->isFloatingType()); 3969 CheckFloatComparison(Loc,lex,rex); 3970 } 3971 3972 if (lType->isArithmeticType() && rType->isArithmeticType()) 3973 return ResultTy; 3974 } 3975 3976 bool LHSIsNull = lex->isNullPointerConstant(Context); 3977 bool RHSIsNull = rex->isNullPointerConstant(Context); 3978 3979 // All of the following pointer related warnings are GCC extensions, except 3980 // when handling null pointer constants. One day, we can consider making them 3981 // errors (when -pedantic-errors is enabled). 3982 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3983 QualType LCanPointeeTy = 3984 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3985 QualType RCanPointeeTy = 3986 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3987 3988 // Simple check: if the pointee types are identical, we're done. 3989 if (LCanPointeeTy == RCanPointeeTy) 3990 return ResultTy; 3991 3992 if (getLangOptions().CPlusPlus) { 3993 // C++ [expr.rel]p2: 3994 // [...] Pointer conversions (4.10) and qualification 3995 // conversions (4.4) are performed on pointer operands (or on 3996 // a pointer operand and a null pointer constant) to bring 3997 // them to their composite pointer type. [...] 3998 // 3999 // C++ [expr.eq]p2 uses the same notion for (in)equality 4000 // comparisons of pointers. 4001 QualType T = FindCompositePointerType(lex, rex); 4002 if (T.isNull()) { 4003 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4004 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4005 return QualType(); 4006 } 4007 4008 ImpCastExprToType(lex, T); 4009 ImpCastExprToType(rex, T); 4010 return ResultTy; 4011 } 4012 4013 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 4014 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 4015 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4016 RCanPointeeTy.getUnqualifiedType()) && 4017 !Context.areComparableObjCPointerTypes(lType, rType)) { 4018 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4019 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4020 } 4021 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4022 return ResultTy; 4023 } 4024 // C++ allows comparison of pointers with null pointer constants. 4025 if (getLangOptions().CPlusPlus) { 4026 if (lType->isPointerType() && RHSIsNull) { 4027 ImpCastExprToType(rex, lType); 4028 return ResultTy; 4029 } 4030 if (rType->isPointerType() && LHSIsNull) { 4031 ImpCastExprToType(lex, rType); 4032 return ResultTy; 4033 } 4034 // And comparison of nullptr_t with itself. 4035 if (lType->isNullPtrType() && rType->isNullPtrType()) 4036 return ResultTy; 4037 } 4038 // Handle block pointer types. 4039 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4040 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4041 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4042 4043 if (!LHSIsNull && !RHSIsNull && 4044 !Context.typesAreCompatible(lpointee, rpointee)) { 4045 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4046 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4047 } 4048 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4049 return ResultTy; 4050 } 4051 // Allow block pointers to be compared with null pointer constants. 4052 if (!isRelational 4053 && ((lType->isBlockPointerType() && rType->isPointerType()) 4054 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4055 if (!LHSIsNull && !RHSIsNull) { 4056 if (!((rType->isPointerType() && rType->getAsPointerType() 4057 ->getPointeeType()->isVoidType()) 4058 || (lType->isPointerType() && lType->getAsPointerType() 4059 ->getPointeeType()->isVoidType()))) 4060 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4061 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4062 } 4063 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4064 return ResultTy; 4065 } 4066 4067 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4068 if (lType->isPointerType() || rType->isPointerType()) { 4069 const PointerType *LPT = lType->getAsPointerType(); 4070 const PointerType *RPT = rType->getAsPointerType(); 4071 bool LPtrToVoid = LPT ? 4072 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4073 bool RPtrToVoid = RPT ? 4074 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4075 4076 if (!LPtrToVoid && !RPtrToVoid && 4077 !Context.typesAreCompatible(lType, rType)) { 4078 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4079 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4080 ImpCastExprToType(rex, lType); 4081 return ResultTy; 4082 } 4083 ImpCastExprToType(rex, lType); 4084 return ResultTy; 4085 } 4086 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4087 ImpCastExprToType(rex, lType); 4088 return ResultTy; 4089 } else { 4090 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4091 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4092 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4093 ImpCastExprToType(rex, lType); 4094 return ResultTy; 4095 } 4096 } 4097 } 4098 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4099 rType->isIntegerType()) { 4100 if (!RHSIsNull) 4101 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4102 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4103 ImpCastExprToType(rex, lType); // promote the integer to pointer 4104 return ResultTy; 4105 } 4106 if (lType->isIntegerType() && 4107 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 4108 if (!LHSIsNull) 4109 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4110 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4111 ImpCastExprToType(lex, rType); // promote the integer to pointer 4112 return ResultTy; 4113 } 4114 // Handle block pointers. 4115 if (!isRelational && RHSIsNull 4116 && lType->isBlockPointerType() && rType->isIntegerType()) { 4117 ImpCastExprToType(rex, lType); // promote the integer to pointer 4118 return ResultTy; 4119 } 4120 if (!isRelational && LHSIsNull 4121 && lType->isIntegerType() && rType->isBlockPointerType()) { 4122 ImpCastExprToType(lex, rType); // promote the integer to pointer 4123 return ResultTy; 4124 } 4125 return InvalidOperands(Loc, lex, rex); 4126} 4127 4128/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4129/// operates on extended vector types. Instead of producing an IntTy result, 4130/// like a scalar comparison, a vector comparison produces a vector of integer 4131/// types. 4132QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4133 SourceLocation Loc, 4134 bool isRelational) { 4135 // Check to make sure we're operating on vectors of the same type and width, 4136 // Allowing one side to be a scalar of element type. 4137 QualType vType = CheckVectorOperands(Loc, lex, rex); 4138 if (vType.isNull()) 4139 return vType; 4140 4141 QualType lType = lex->getType(); 4142 QualType rType = rex->getType(); 4143 4144 // For non-floating point types, check for self-comparisons of the form 4145 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4146 // often indicate logic errors in the program. 4147 if (!lType->isFloatingType()) { 4148 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4149 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4150 if (DRL->getDecl() == DRR->getDecl()) 4151 Diag(Loc, diag::warn_selfcomparison); 4152 } 4153 4154 // Check for comparisons of floating point operands using != and ==. 4155 if (!isRelational && lType->isFloatingType()) { 4156 assert (rType->isFloatingType()); 4157 CheckFloatComparison(Loc,lex,rex); 4158 } 4159 4160 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4161 // just reject all vector comparisons for now. 4162 if (1) { 4163 Diag(Loc, diag::err_typecheck_vector_comparison) 4164 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4165 return QualType(); 4166 } 4167 4168 // Return the type for the comparison, which is the same as vector type for 4169 // integer vectors, or an integer type of identical size and number of 4170 // elements for floating point vectors. 4171 if (lType->isIntegerType()) 4172 return lType; 4173 4174 const VectorType *VTy = lType->getAsVectorType(); 4175 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4176 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4177 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4178 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4179 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4180 4181 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4182 "Unhandled vector element size in vector compare"); 4183 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4184} 4185 4186inline QualType Sema::CheckBitwiseOperands( 4187 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4188{ 4189 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4190 return CheckVectorOperands(Loc, lex, rex); 4191 4192 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4193 4194 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4195 return compType; 4196 return InvalidOperands(Loc, lex, rex); 4197} 4198 4199inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4200 Expr *&lex, Expr *&rex, SourceLocation Loc) 4201{ 4202 UsualUnaryConversions(lex); 4203 UsualUnaryConversions(rex); 4204 4205 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4206 return Context.IntTy; 4207 return InvalidOperands(Loc, lex, rex); 4208} 4209 4210/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4211/// is a read-only property; return true if so. A readonly property expression 4212/// depends on various declarations and thus must be treated specially. 4213/// 4214static bool IsReadonlyProperty(Expr *E, Sema &S) 4215{ 4216 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4217 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4218 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4219 QualType BaseType = PropExpr->getBase()->getType(); 4220 if (const PointerType *PTy = BaseType->getAsPointerType()) 4221 if (const ObjCInterfaceType *IFTy = 4222 PTy->getPointeeType()->getAsObjCInterfaceType()) 4223 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4224 if (S.isPropertyReadonly(PDecl, IFace)) 4225 return true; 4226 } 4227 } 4228 return false; 4229} 4230 4231/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4232/// emit an error and return true. If so, return false. 4233static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4234 SourceLocation OrigLoc = Loc; 4235 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4236 &Loc); 4237 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4238 IsLV = Expr::MLV_ReadonlyProperty; 4239 if (IsLV == Expr::MLV_Valid) 4240 return false; 4241 4242 unsigned Diag = 0; 4243 bool NeedType = false; 4244 switch (IsLV) { // C99 6.5.16p2 4245 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4246 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4247 case Expr::MLV_ArrayType: 4248 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4249 NeedType = true; 4250 break; 4251 case Expr::MLV_NotObjectType: 4252 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4253 NeedType = true; 4254 break; 4255 case Expr::MLV_LValueCast: 4256 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4257 break; 4258 case Expr::MLV_InvalidExpression: 4259 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4260 break; 4261 case Expr::MLV_IncompleteType: 4262 case Expr::MLV_IncompleteVoidType: 4263 return S.RequireCompleteType(Loc, E->getType(), 4264 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4265 E->getSourceRange()); 4266 case Expr::MLV_DuplicateVectorComponents: 4267 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4268 break; 4269 case Expr::MLV_NotBlockQualified: 4270 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4271 break; 4272 case Expr::MLV_ReadonlyProperty: 4273 Diag = diag::error_readonly_property_assignment; 4274 break; 4275 case Expr::MLV_NoSetterProperty: 4276 Diag = diag::error_nosetter_property_assignment; 4277 break; 4278 } 4279 4280 SourceRange Assign; 4281 if (Loc != OrigLoc) 4282 Assign = SourceRange(OrigLoc, OrigLoc); 4283 if (NeedType) 4284 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4285 else 4286 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4287 return true; 4288} 4289 4290 4291 4292// C99 6.5.16.1 4293QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4294 SourceLocation Loc, 4295 QualType CompoundType) { 4296 // Verify that LHS is a modifiable lvalue, and emit error if not. 4297 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4298 return QualType(); 4299 4300 QualType LHSType = LHS->getType(); 4301 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4302 4303 AssignConvertType ConvTy; 4304 if (CompoundType.isNull()) { 4305 // Simple assignment "x = y". 4306 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4307 // Special case of NSObject attributes on c-style pointer types. 4308 if (ConvTy == IncompatiblePointer && 4309 ((Context.isObjCNSObjectType(LHSType) && 4310 Context.isObjCObjectPointerType(RHSType)) || 4311 (Context.isObjCNSObjectType(RHSType) && 4312 Context.isObjCObjectPointerType(LHSType)))) 4313 ConvTy = Compatible; 4314 4315 // If the RHS is a unary plus or minus, check to see if they = and + are 4316 // right next to each other. If so, the user may have typo'd "x =+ 4" 4317 // instead of "x += 4". 4318 Expr *RHSCheck = RHS; 4319 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4320 RHSCheck = ICE->getSubExpr(); 4321 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4322 if ((UO->getOpcode() == UnaryOperator::Plus || 4323 UO->getOpcode() == UnaryOperator::Minus) && 4324 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4325 // Only if the two operators are exactly adjacent. 4326 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4327 // And there is a space or other character before the subexpr of the 4328 // unary +/-. We don't want to warn on "x=-1". 4329 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4330 UO->getSubExpr()->getLocStart().isFileID()) { 4331 Diag(Loc, diag::warn_not_compound_assign) 4332 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4333 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4334 } 4335 } 4336 } else { 4337 // Compound assignment "x += y" 4338 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4339 } 4340 4341 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4342 RHS, "assigning")) 4343 return QualType(); 4344 4345 // C99 6.5.16p3: The type of an assignment expression is the type of the 4346 // left operand unless the left operand has qualified type, in which case 4347 // it is the unqualified version of the type of the left operand. 4348 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4349 // is converted to the type of the assignment expression (above). 4350 // C++ 5.17p1: the type of the assignment expression is that of its left 4351 // operand. 4352 return LHSType.getUnqualifiedType(); 4353} 4354 4355// C99 6.5.17 4356QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4357 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4358 DefaultFunctionArrayConversion(RHS); 4359 4360 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4361 // incomplete in C++). 4362 4363 return RHS->getType(); 4364} 4365 4366/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4367/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4368QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4369 bool isInc) { 4370 if (Op->isTypeDependent()) 4371 return Context.DependentTy; 4372 4373 QualType ResType = Op->getType(); 4374 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4375 4376 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4377 // Decrement of bool is not allowed. 4378 if (!isInc) { 4379 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4380 return QualType(); 4381 } 4382 // Increment of bool sets it to true, but is deprecated. 4383 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4384 } else if (ResType->isRealType()) { 4385 // OK! 4386 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4387 // C99 6.5.2.4p2, 6.5.6p2 4388 if (PT->getPointeeType()->isVoidType()) { 4389 if (getLangOptions().CPlusPlus) { 4390 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4391 << Op->getSourceRange(); 4392 return QualType(); 4393 } 4394 4395 // Pointer to void is a GNU extension in C. 4396 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4397 } else if (PT->getPointeeType()->isFunctionType()) { 4398 if (getLangOptions().CPlusPlus) { 4399 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4400 << Op->getType() << Op->getSourceRange(); 4401 return QualType(); 4402 } 4403 4404 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4405 << ResType << Op->getSourceRange(); 4406 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4407 diag::err_typecheck_arithmetic_incomplete_type, 4408 Op->getSourceRange(), SourceRange(), 4409 ResType)) 4410 return QualType(); 4411 } else if (ResType->isComplexType()) { 4412 // C99 does not support ++/-- on complex types, we allow as an extension. 4413 Diag(OpLoc, diag::ext_integer_increment_complex) 4414 << ResType << Op->getSourceRange(); 4415 } else { 4416 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4417 << ResType << Op->getSourceRange(); 4418 return QualType(); 4419 } 4420 // At this point, we know we have a real, complex or pointer type. 4421 // Now make sure the operand is a modifiable lvalue. 4422 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4423 return QualType(); 4424 return ResType; 4425} 4426 4427/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4428/// This routine allows us to typecheck complex/recursive expressions 4429/// where the declaration is needed for type checking. We only need to 4430/// handle cases when the expression references a function designator 4431/// or is an lvalue. Here are some examples: 4432/// - &(x) => x 4433/// - &*****f => f for f a function designator. 4434/// - &s.xx => s 4435/// - &s.zz[1].yy -> s, if zz is an array 4436/// - *(x + 1) -> x, if x is an array 4437/// - &"123"[2] -> 0 4438/// - & __real__ x -> x 4439static NamedDecl *getPrimaryDecl(Expr *E) { 4440 switch (E->getStmtClass()) { 4441 case Stmt::DeclRefExprClass: 4442 case Stmt::QualifiedDeclRefExprClass: 4443 return cast<DeclRefExpr>(E)->getDecl(); 4444 case Stmt::MemberExprClass: 4445 // If this is an arrow operator, the address is an offset from 4446 // the base's value, so the object the base refers to is 4447 // irrelevant. 4448 if (cast<MemberExpr>(E)->isArrow()) 4449 return 0; 4450 // Otherwise, the expression refers to a part of the base 4451 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4452 case Stmt::ArraySubscriptExprClass: { 4453 // FIXME: This code shouldn't be necessary! We should catch the implicit 4454 // promotion of register arrays earlier. 4455 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4456 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4457 if (ICE->getSubExpr()->getType()->isArrayType()) 4458 return getPrimaryDecl(ICE->getSubExpr()); 4459 } 4460 return 0; 4461 } 4462 case Stmt::UnaryOperatorClass: { 4463 UnaryOperator *UO = cast<UnaryOperator>(E); 4464 4465 switch(UO->getOpcode()) { 4466 case UnaryOperator::Real: 4467 case UnaryOperator::Imag: 4468 case UnaryOperator::Extension: 4469 return getPrimaryDecl(UO->getSubExpr()); 4470 default: 4471 return 0; 4472 } 4473 } 4474 case Stmt::ParenExprClass: 4475 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4476 case Stmt::ImplicitCastExprClass: 4477 // If the result of an implicit cast is an l-value, we care about 4478 // the sub-expression; otherwise, the result here doesn't matter. 4479 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4480 default: 4481 return 0; 4482 } 4483} 4484 4485/// CheckAddressOfOperand - The operand of & must be either a function 4486/// designator or an lvalue designating an object. If it is an lvalue, the 4487/// object cannot be declared with storage class register or be a bit field. 4488/// Note: The usual conversions are *not* applied to the operand of the & 4489/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4490/// In C++, the operand might be an overloaded function name, in which case 4491/// we allow the '&' but retain the overloaded-function type. 4492QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4493 // Make sure to ignore parentheses in subsequent checks 4494 op = op->IgnoreParens(); 4495 4496 if (op->isTypeDependent()) 4497 return Context.DependentTy; 4498 4499 if (getLangOptions().C99) { 4500 // Implement C99-only parts of addressof rules. 4501 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4502 if (uOp->getOpcode() == UnaryOperator::Deref) 4503 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4504 // (assuming the deref expression is valid). 4505 return uOp->getSubExpr()->getType(); 4506 } 4507 // Technically, there should be a check for array subscript 4508 // expressions here, but the result of one is always an lvalue anyway. 4509 } 4510 NamedDecl *dcl = getPrimaryDecl(op); 4511 Expr::isLvalueResult lval = op->isLvalue(Context); 4512 4513 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4514 // C99 6.5.3.2p1 4515 // The operand must be either an l-value or a function designator 4516 if (!op->getType()->isFunctionType()) { 4517 // FIXME: emit more specific diag... 4518 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4519 << op->getSourceRange(); 4520 return QualType(); 4521 } 4522 } else if (op->getBitField()) { // C99 6.5.3.2p1 4523 // The operand cannot be a bit-field 4524 Diag(OpLoc, diag::err_typecheck_address_of) 4525 << "bit-field" << op->getSourceRange(); 4526 return QualType(); 4527 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4528 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4529 // The operand cannot be an element of a vector 4530 Diag(OpLoc, diag::err_typecheck_address_of) 4531 << "vector element" << op->getSourceRange(); 4532 return QualType(); 4533 } else if (dcl) { // C99 6.5.3.2p1 4534 // We have an lvalue with a decl. Make sure the decl is not declared 4535 // with the register storage-class specifier. 4536 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4537 if (vd->getStorageClass() == VarDecl::Register) { 4538 Diag(OpLoc, diag::err_typecheck_address_of) 4539 << "register variable" << op->getSourceRange(); 4540 return QualType(); 4541 } 4542 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4543 return Context.OverloadTy; 4544 } else if (isa<FieldDecl>(dcl)) { 4545 // Okay: we can take the address of a field. 4546 // Could be a pointer to member, though, if there is an explicit 4547 // scope qualifier for the class. 4548 if (isa<QualifiedDeclRefExpr>(op)) { 4549 DeclContext *Ctx = dcl->getDeclContext(); 4550 if (Ctx && Ctx->isRecord()) 4551 return Context.getMemberPointerType(op->getType(), 4552 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4553 } 4554 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4555 // Okay: we can take the address of a function. 4556 // As above. 4557 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4558 return Context.getMemberPointerType(op->getType(), 4559 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4560 } else if (!isa<FunctionDecl>(dcl)) 4561 assert(0 && "Unknown/unexpected decl type"); 4562 } 4563 4564 if (lval == Expr::LV_IncompleteVoidType) { 4565 // Taking the address of a void variable is technically illegal, but we 4566 // allow it in cases which are otherwise valid. 4567 // Example: "extern void x; void* y = &x;". 4568 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4569 } 4570 4571 // If the operand has type "type", the result has type "pointer to type". 4572 return Context.getPointerType(op->getType()); 4573} 4574 4575QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4576 if (Op->isTypeDependent()) 4577 return Context.DependentTy; 4578 4579 UsualUnaryConversions(Op); 4580 QualType Ty = Op->getType(); 4581 4582 // Note that per both C89 and C99, this is always legal, even if ptype is an 4583 // incomplete type or void. It would be possible to warn about dereferencing 4584 // a void pointer, but it's completely well-defined, and such a warning is 4585 // unlikely to catch any mistakes. 4586 if (const PointerType *PT = Ty->getAsPointerType()) 4587 return PT->getPointeeType(); 4588 4589 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4590 << Ty << Op->getSourceRange(); 4591 return QualType(); 4592} 4593 4594static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4595 tok::TokenKind Kind) { 4596 BinaryOperator::Opcode Opc; 4597 switch (Kind) { 4598 default: assert(0 && "Unknown binop!"); 4599 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4600 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4601 case tok::star: Opc = BinaryOperator::Mul; break; 4602 case tok::slash: Opc = BinaryOperator::Div; break; 4603 case tok::percent: Opc = BinaryOperator::Rem; break; 4604 case tok::plus: Opc = BinaryOperator::Add; break; 4605 case tok::minus: Opc = BinaryOperator::Sub; break; 4606 case tok::lessless: Opc = BinaryOperator::Shl; break; 4607 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4608 case tok::lessequal: Opc = BinaryOperator::LE; break; 4609 case tok::less: Opc = BinaryOperator::LT; break; 4610 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4611 case tok::greater: Opc = BinaryOperator::GT; break; 4612 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4613 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4614 case tok::amp: Opc = BinaryOperator::And; break; 4615 case tok::caret: Opc = BinaryOperator::Xor; break; 4616 case tok::pipe: Opc = BinaryOperator::Or; break; 4617 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4618 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4619 case tok::equal: Opc = BinaryOperator::Assign; break; 4620 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4621 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4622 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4623 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4624 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4625 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4626 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4627 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4628 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4629 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4630 case tok::comma: Opc = BinaryOperator::Comma; break; 4631 } 4632 return Opc; 4633} 4634 4635static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4636 tok::TokenKind Kind) { 4637 UnaryOperator::Opcode Opc; 4638 switch (Kind) { 4639 default: assert(0 && "Unknown unary op!"); 4640 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4641 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4642 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4643 case tok::star: Opc = UnaryOperator::Deref; break; 4644 case tok::plus: Opc = UnaryOperator::Plus; break; 4645 case tok::minus: Opc = UnaryOperator::Minus; break; 4646 case tok::tilde: Opc = UnaryOperator::Not; break; 4647 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4648 case tok::kw___real: Opc = UnaryOperator::Real; break; 4649 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4650 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4651 } 4652 return Opc; 4653} 4654 4655/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4656/// operator @p Opc at location @c TokLoc. This routine only supports 4657/// built-in operations; ActOnBinOp handles overloaded operators. 4658Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4659 unsigned Op, 4660 Expr *lhs, Expr *rhs) { 4661 QualType ResultTy; // Result type of the binary operator. 4662 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4663 // The following two variables are used for compound assignment operators 4664 QualType CompLHSTy; // Type of LHS after promotions for computation 4665 QualType CompResultTy; // Type of computation result 4666 4667 switch (Opc) { 4668 case BinaryOperator::Assign: 4669 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4670 break; 4671 case BinaryOperator::PtrMemD: 4672 case BinaryOperator::PtrMemI: 4673 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4674 Opc == BinaryOperator::PtrMemI); 4675 break; 4676 case BinaryOperator::Mul: 4677 case BinaryOperator::Div: 4678 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4679 break; 4680 case BinaryOperator::Rem: 4681 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4682 break; 4683 case BinaryOperator::Add: 4684 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4685 break; 4686 case BinaryOperator::Sub: 4687 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4688 break; 4689 case BinaryOperator::Shl: 4690 case BinaryOperator::Shr: 4691 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4692 break; 4693 case BinaryOperator::LE: 4694 case BinaryOperator::LT: 4695 case BinaryOperator::GE: 4696 case BinaryOperator::GT: 4697 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4698 break; 4699 case BinaryOperator::EQ: 4700 case BinaryOperator::NE: 4701 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4702 break; 4703 case BinaryOperator::And: 4704 case BinaryOperator::Xor: 4705 case BinaryOperator::Or: 4706 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4707 break; 4708 case BinaryOperator::LAnd: 4709 case BinaryOperator::LOr: 4710 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4711 break; 4712 case BinaryOperator::MulAssign: 4713 case BinaryOperator::DivAssign: 4714 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4715 CompLHSTy = CompResultTy; 4716 if (!CompResultTy.isNull()) 4717 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4718 break; 4719 case BinaryOperator::RemAssign: 4720 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4721 CompLHSTy = CompResultTy; 4722 if (!CompResultTy.isNull()) 4723 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4724 break; 4725 case BinaryOperator::AddAssign: 4726 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4727 if (!CompResultTy.isNull()) 4728 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4729 break; 4730 case BinaryOperator::SubAssign: 4731 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4732 if (!CompResultTy.isNull()) 4733 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4734 break; 4735 case BinaryOperator::ShlAssign: 4736 case BinaryOperator::ShrAssign: 4737 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4738 CompLHSTy = CompResultTy; 4739 if (!CompResultTy.isNull()) 4740 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4741 break; 4742 case BinaryOperator::AndAssign: 4743 case BinaryOperator::XorAssign: 4744 case BinaryOperator::OrAssign: 4745 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4746 CompLHSTy = CompResultTy; 4747 if (!CompResultTy.isNull()) 4748 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4749 break; 4750 case BinaryOperator::Comma: 4751 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4752 break; 4753 } 4754 if (ResultTy.isNull()) 4755 return ExprError(); 4756 if (CompResultTy.isNull()) 4757 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4758 else 4759 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4760 CompLHSTy, CompResultTy, 4761 OpLoc)); 4762} 4763 4764// Binary Operators. 'Tok' is the token for the operator. 4765Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4766 tok::TokenKind Kind, 4767 ExprArg LHS, ExprArg RHS) { 4768 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4769 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4770 4771 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4772 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4773 4774 if (getLangOptions().CPlusPlus && 4775 (lhs->getType()->isOverloadableType() || 4776 rhs->getType()->isOverloadableType())) { 4777 // Find all of the overloaded operators visible from this 4778 // point. We perform both an operator-name lookup from the local 4779 // scope and an argument-dependent lookup based on the types of 4780 // the arguments. 4781 FunctionSet Functions; 4782 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4783 if (OverOp != OO_None) { 4784 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4785 Functions); 4786 Expr *Args[2] = { lhs, rhs }; 4787 DeclarationName OpName 4788 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4789 ArgumentDependentLookup(OpName, Args, 2, Functions); 4790 } 4791 4792 // Build the (potentially-overloaded, potentially-dependent) 4793 // binary operation. 4794 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4795 } 4796 4797 // Build a built-in binary operation. 4798 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4799} 4800 4801Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4802 unsigned OpcIn, 4803 ExprArg InputArg) { 4804 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4805 4806 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4807 Expr *Input = (Expr *)InputArg.get(); 4808 QualType resultType; 4809 switch (Opc) { 4810 case UnaryOperator::PostInc: 4811 case UnaryOperator::PostDec: 4812 case UnaryOperator::OffsetOf: 4813 assert(false && "Invalid unary operator"); 4814 break; 4815 4816 case UnaryOperator::PreInc: 4817 case UnaryOperator::PreDec: 4818 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4819 Opc == UnaryOperator::PreInc); 4820 break; 4821 case UnaryOperator::AddrOf: 4822 resultType = CheckAddressOfOperand(Input, OpLoc); 4823 break; 4824 case UnaryOperator::Deref: 4825 DefaultFunctionArrayConversion(Input); 4826 resultType = CheckIndirectionOperand(Input, OpLoc); 4827 break; 4828 case UnaryOperator::Plus: 4829 case UnaryOperator::Minus: 4830 UsualUnaryConversions(Input); 4831 resultType = Input->getType(); 4832 if (resultType->isDependentType()) 4833 break; 4834 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4835 break; 4836 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4837 resultType->isEnumeralType()) 4838 break; 4839 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4840 Opc == UnaryOperator::Plus && 4841 resultType->isPointerType()) 4842 break; 4843 4844 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4845 << resultType << Input->getSourceRange()); 4846 case UnaryOperator::Not: // bitwise complement 4847 UsualUnaryConversions(Input); 4848 resultType = Input->getType(); 4849 if (resultType->isDependentType()) 4850 break; 4851 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4852 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4853 // C99 does not support '~' for complex conjugation. 4854 Diag(OpLoc, diag::ext_integer_complement_complex) 4855 << resultType << Input->getSourceRange(); 4856 else if (!resultType->isIntegerType()) 4857 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4858 << resultType << Input->getSourceRange()); 4859 break; 4860 case UnaryOperator::LNot: // logical negation 4861 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4862 DefaultFunctionArrayConversion(Input); 4863 resultType = Input->getType(); 4864 if (resultType->isDependentType()) 4865 break; 4866 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4867 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4868 << resultType << Input->getSourceRange()); 4869 // LNot always has type int. C99 6.5.3.3p5. 4870 // In C++, it's bool. C++ 5.3.1p8 4871 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4872 break; 4873 case UnaryOperator::Real: 4874 case UnaryOperator::Imag: 4875 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4876 break; 4877 case UnaryOperator::Extension: 4878 resultType = Input->getType(); 4879 break; 4880 } 4881 if (resultType.isNull()) 4882 return ExprError(); 4883 4884 InputArg.release(); 4885 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4886} 4887 4888// Unary Operators. 'Tok' is the token for the operator. 4889Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4890 tok::TokenKind Op, ExprArg input) { 4891 Expr *Input = (Expr*)input.get(); 4892 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4893 4894 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4895 // Find all of the overloaded operators visible from this 4896 // point. We perform both an operator-name lookup from the local 4897 // scope and an argument-dependent lookup based on the types of 4898 // the arguments. 4899 FunctionSet Functions; 4900 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4901 if (OverOp != OO_None) { 4902 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4903 Functions); 4904 DeclarationName OpName 4905 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4906 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4907 } 4908 4909 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4910 } 4911 4912 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4913} 4914 4915/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4916Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4917 SourceLocation LabLoc, 4918 IdentifierInfo *LabelII) { 4919 // Look up the record for this label identifier. 4920 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4921 4922 // If we haven't seen this label yet, create a forward reference. It 4923 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4924 if (LabelDecl == 0) 4925 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4926 4927 // Create the AST node. The address of a label always has type 'void*'. 4928 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4929 Context.getPointerType(Context.VoidTy))); 4930} 4931 4932Sema::OwningExprResult 4933Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4934 SourceLocation RPLoc) { // "({..})" 4935 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4936 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4937 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4938 4939 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4940 if (isFileScope) 4941 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4942 4943 // FIXME: there are a variety of strange constraints to enforce here, for 4944 // example, it is not possible to goto into a stmt expression apparently. 4945 // More semantic analysis is needed. 4946 4947 // If there are sub stmts in the compound stmt, take the type of the last one 4948 // as the type of the stmtexpr. 4949 QualType Ty = Context.VoidTy; 4950 4951 if (!Compound->body_empty()) { 4952 Stmt *LastStmt = Compound->body_back(); 4953 // If LastStmt is a label, skip down through into the body. 4954 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4955 LastStmt = Label->getSubStmt(); 4956 4957 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4958 Ty = LastExpr->getType(); 4959 } 4960 4961 // FIXME: Check that expression type is complete/non-abstract; statement 4962 // expressions are not lvalues. 4963 4964 substmt.release(); 4965 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4966} 4967 4968Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4969 SourceLocation BuiltinLoc, 4970 SourceLocation TypeLoc, 4971 TypeTy *argty, 4972 OffsetOfComponent *CompPtr, 4973 unsigned NumComponents, 4974 SourceLocation RPLoc) { 4975 // FIXME: This function leaks all expressions in the offset components on 4976 // error. 4977 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4978 assert(!ArgTy.isNull() && "Missing type argument!"); 4979 4980 bool Dependent = ArgTy->isDependentType(); 4981 4982 // We must have at least one component that refers to the type, and the first 4983 // one is known to be a field designator. Verify that the ArgTy represents 4984 // a struct/union/class. 4985 if (!Dependent && !ArgTy->isRecordType()) 4986 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4987 4988 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4989 // with an incomplete type would be illegal. 4990 4991 // Otherwise, create a null pointer as the base, and iteratively process 4992 // the offsetof designators. 4993 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4994 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4995 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4996 ArgTy, SourceLocation()); 4997 4998 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4999 // GCC extension, diagnose them. 5000 // FIXME: This diagnostic isn't actually visible because the location is in 5001 // a system header! 5002 if (NumComponents != 1) 5003 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5004 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5005 5006 if (!Dependent) { 5007 bool DidWarnAboutNonPOD = false; 5008 5009 // FIXME: Dependent case loses a lot of information here. And probably 5010 // leaks like a sieve. 5011 for (unsigned i = 0; i != NumComponents; ++i) { 5012 const OffsetOfComponent &OC = CompPtr[i]; 5013 if (OC.isBrackets) { 5014 // Offset of an array sub-field. TODO: Should we allow vector elements? 5015 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5016 if (!AT) { 5017 Res->Destroy(Context); 5018 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5019 << Res->getType()); 5020 } 5021 5022 // FIXME: C++: Verify that operator[] isn't overloaded. 5023 5024 // Promote the array so it looks more like a normal array subscript 5025 // expression. 5026 DefaultFunctionArrayConversion(Res); 5027 5028 // C99 6.5.2.1p1 5029 Expr *Idx = static_cast<Expr*>(OC.U.E); 5030 // FIXME: Leaks Res 5031 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5032 return ExprError(Diag(Idx->getLocStart(), 5033 diag::err_typecheck_subscript_not_integer) 5034 << Idx->getSourceRange()); 5035 5036 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5037 OC.LocEnd); 5038 continue; 5039 } 5040 5041 const RecordType *RC = Res->getType()->getAsRecordType(); 5042 if (!RC) { 5043 Res->Destroy(Context); 5044 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5045 << Res->getType()); 5046 } 5047 5048 // Get the decl corresponding to this. 5049 RecordDecl *RD = RC->getDecl(); 5050 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5051 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5052 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5053 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5054 << Res->getType()); 5055 DidWarnAboutNonPOD = true; 5056 } 5057 } 5058 5059 FieldDecl *MemberDecl 5060 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5061 LookupMemberName) 5062 .getAsDecl()); 5063 // FIXME: Leaks Res 5064 if (!MemberDecl) 5065 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5066 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5067 5068 // FIXME: C++: Verify that MemberDecl isn't a static field. 5069 // FIXME: Verify that MemberDecl isn't a bitfield. 5070 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5071 Res = BuildAnonymousStructUnionMemberReference( 5072 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5073 } else { 5074 // MemberDecl->getType() doesn't get the right qualifiers, but it 5075 // doesn't matter here. 5076 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5077 MemberDecl->getType().getNonReferenceType()); 5078 } 5079 } 5080 } 5081 5082 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5083 Context.getSizeType(), BuiltinLoc)); 5084} 5085 5086 5087Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5088 TypeTy *arg1,TypeTy *arg2, 5089 SourceLocation RPLoc) { 5090 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5091 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5092 5093 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5094 5095 if (getLangOptions().CPlusPlus) { 5096 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5097 << SourceRange(BuiltinLoc, RPLoc); 5098 return ExprError(); 5099 } 5100 5101 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5102 argT1, argT2, RPLoc)); 5103} 5104 5105Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5106 ExprArg cond, 5107 ExprArg expr1, ExprArg expr2, 5108 SourceLocation RPLoc) { 5109 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5110 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5111 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5112 5113 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5114 5115 QualType resType; 5116 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5117 resType = Context.DependentTy; 5118 } else { 5119 // The conditional expression is required to be a constant expression. 5120 llvm::APSInt condEval(32); 5121 SourceLocation ExpLoc; 5122 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5123 return ExprError(Diag(ExpLoc, 5124 diag::err_typecheck_choose_expr_requires_constant) 5125 << CondExpr->getSourceRange()); 5126 5127 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5128 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5129 } 5130 5131 cond.release(); expr1.release(); expr2.release(); 5132 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5133 resType, RPLoc)); 5134} 5135 5136//===----------------------------------------------------------------------===// 5137// Clang Extensions. 5138//===----------------------------------------------------------------------===// 5139 5140/// ActOnBlockStart - This callback is invoked when a block literal is started. 5141void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5142 // Analyze block parameters. 5143 BlockSemaInfo *BSI = new BlockSemaInfo(); 5144 5145 // Add BSI to CurBlock. 5146 BSI->PrevBlockInfo = CurBlock; 5147 CurBlock = BSI; 5148 5149 BSI->ReturnType = QualType(); 5150 BSI->TheScope = BlockScope; 5151 BSI->hasBlockDeclRefExprs = false; 5152 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5153 CurFunctionNeedsScopeChecking = false; 5154 5155 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5156 PushDeclContext(BlockScope, BSI->TheDecl); 5157} 5158 5159void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5160 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5161 5162 if (ParamInfo.getNumTypeObjects() == 0 5163 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5164 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5165 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5166 5167 if (T->isArrayType()) { 5168 Diag(ParamInfo.getSourceRange().getBegin(), 5169 diag::err_block_returns_array); 5170 return; 5171 } 5172 5173 // The parameter list is optional, if there was none, assume (). 5174 if (!T->isFunctionType()) 5175 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5176 5177 CurBlock->hasPrototype = true; 5178 CurBlock->isVariadic = false; 5179 // Check for a valid sentinel attribute on this block. 5180 if (CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5181 Diag(ParamInfo.getAttributes()->getLoc(), 5182 diag::warn_attribute_sentinel_not_variadic) << 1; 5183 // FIXME: remove the attribute. 5184 } 5185 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5186 5187 // Do not allow returning a objc interface by-value. 5188 if (RetTy->isObjCInterfaceType()) { 5189 Diag(ParamInfo.getSourceRange().getBegin(), 5190 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5191 return; 5192 } 5193 return; 5194 } 5195 5196 // Analyze arguments to block. 5197 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5198 "Not a function declarator!"); 5199 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5200 5201 CurBlock->hasPrototype = FTI.hasPrototype; 5202 CurBlock->isVariadic = true; 5203 5204 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5205 // no arguments, not a function that takes a single void argument. 5206 if (FTI.hasPrototype && 5207 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5208 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5209 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5210 // empty arg list, don't push any params. 5211 CurBlock->isVariadic = false; 5212 } else if (FTI.hasPrototype) { 5213 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5214 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5215 CurBlock->isVariadic = FTI.isVariadic; 5216 } 5217 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5218 CurBlock->Params.size()); 5219 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5220 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5221 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5222 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5223 // If this has an identifier, add it to the scope stack. 5224 if ((*AI)->getIdentifier()) 5225 PushOnScopeChains(*AI, CurBlock->TheScope); 5226 5227 // Check for a valid sentinel attribute on this block. 5228 if (!CurBlock->isVariadic && 5229 CurBlock->TheDecl->getAttr<SentinelAttr>(Context)) { 5230 Diag(ParamInfo.getAttributes()->getLoc(), 5231 diag::warn_attribute_sentinel_not_variadic) << 1; 5232 // FIXME: remove the attribute. 5233 } 5234 5235 // Analyze the return type. 5236 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5237 QualType RetTy = T->getAsFunctionType()->getResultType(); 5238 5239 // Do not allow returning a objc interface by-value. 5240 if (RetTy->isObjCInterfaceType()) { 5241 Diag(ParamInfo.getSourceRange().getBegin(), 5242 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5243 } else if (!RetTy->isDependentType()) 5244 CurBlock->ReturnType = RetTy; 5245} 5246 5247/// ActOnBlockError - If there is an error parsing a block, this callback 5248/// is invoked to pop the information about the block from the action impl. 5249void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5250 // Ensure that CurBlock is deleted. 5251 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5252 5253 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5254 5255 // Pop off CurBlock, handle nested blocks. 5256 PopDeclContext(); 5257 CurBlock = CurBlock->PrevBlockInfo; 5258 // FIXME: Delete the ParmVarDecl objects as well??? 5259} 5260 5261/// ActOnBlockStmtExpr - This is called when the body of a block statement 5262/// literal was successfully completed. ^(int x){...} 5263Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5264 StmtArg body, Scope *CurScope) { 5265 // If blocks are disabled, emit an error. 5266 if (!LangOpts.Blocks) 5267 Diag(CaretLoc, diag::err_blocks_disable); 5268 5269 // Ensure that CurBlock is deleted. 5270 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5271 5272 PopDeclContext(); 5273 5274 // Pop off CurBlock, handle nested blocks. 5275 CurBlock = CurBlock->PrevBlockInfo; 5276 5277 QualType RetTy = Context.VoidTy; 5278 if (!BSI->ReturnType.isNull()) 5279 RetTy = BSI->ReturnType; 5280 5281 llvm::SmallVector<QualType, 8> ArgTypes; 5282 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5283 ArgTypes.push_back(BSI->Params[i]->getType()); 5284 5285 QualType BlockTy; 5286 if (!BSI->hasPrototype) 5287 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5288 else 5289 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5290 BSI->isVariadic, 0); 5291 5292 // FIXME: Check that return/parameter types are complete/non-abstract 5293 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5294 BlockTy = Context.getBlockPointerType(BlockTy); 5295 5296 // If needed, diagnose invalid gotos and switches in the block. 5297 if (CurFunctionNeedsScopeChecking) 5298 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5299 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5300 5301 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5302 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5303 BSI->hasBlockDeclRefExprs)); 5304} 5305 5306Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5307 ExprArg expr, TypeTy *type, 5308 SourceLocation RPLoc) { 5309 QualType T = QualType::getFromOpaquePtr(type); 5310 Expr *E = static_cast<Expr*>(expr.get()); 5311 Expr *OrigExpr = E; 5312 5313 InitBuiltinVaListType(); 5314 5315 // Get the va_list type 5316 QualType VaListType = Context.getBuiltinVaListType(); 5317 if (VaListType->isArrayType()) { 5318 // Deal with implicit array decay; for example, on x86-64, 5319 // va_list is an array, but it's supposed to decay to 5320 // a pointer for va_arg. 5321 VaListType = Context.getArrayDecayedType(VaListType); 5322 // Make sure the input expression also decays appropriately. 5323 UsualUnaryConversions(E); 5324 } else { 5325 // Otherwise, the va_list argument must be an l-value because 5326 // it is modified by va_arg. 5327 if (!E->isTypeDependent() && 5328 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5329 return ExprError(); 5330 } 5331 5332 if (!E->isTypeDependent() && 5333 !Context.hasSameType(VaListType, E->getType())) { 5334 return ExprError(Diag(E->getLocStart(), 5335 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5336 << OrigExpr->getType() << E->getSourceRange()); 5337 } 5338 5339 // FIXME: Check that type is complete/non-abstract 5340 // FIXME: Warn if a non-POD type is passed in. 5341 5342 expr.release(); 5343 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5344 RPLoc)); 5345} 5346 5347Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5348 // The type of __null will be int or long, depending on the size of 5349 // pointers on the target. 5350 QualType Ty; 5351 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5352 Ty = Context.IntTy; 5353 else 5354 Ty = Context.LongTy; 5355 5356 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5357} 5358 5359bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5360 SourceLocation Loc, 5361 QualType DstType, QualType SrcType, 5362 Expr *SrcExpr, const char *Flavor) { 5363 // Decode the result (notice that AST's are still created for extensions). 5364 bool isInvalid = false; 5365 unsigned DiagKind; 5366 switch (ConvTy) { 5367 default: assert(0 && "Unknown conversion type"); 5368 case Compatible: return false; 5369 case PointerToInt: 5370 DiagKind = diag::ext_typecheck_convert_pointer_int; 5371 break; 5372 case IntToPointer: 5373 DiagKind = diag::ext_typecheck_convert_int_pointer; 5374 break; 5375 case IncompatiblePointer: 5376 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5377 break; 5378 case IncompatiblePointerSign: 5379 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5380 break; 5381 case FunctionVoidPointer: 5382 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5383 break; 5384 case CompatiblePointerDiscardsQualifiers: 5385 // If the qualifiers lost were because we were applying the 5386 // (deprecated) C++ conversion from a string literal to a char* 5387 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5388 // Ideally, this check would be performed in 5389 // CheckPointerTypesForAssignment. However, that would require a 5390 // bit of refactoring (so that the second argument is an 5391 // expression, rather than a type), which should be done as part 5392 // of a larger effort to fix CheckPointerTypesForAssignment for 5393 // C++ semantics. 5394 if (getLangOptions().CPlusPlus && 5395 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5396 return false; 5397 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5398 break; 5399 case IntToBlockPointer: 5400 DiagKind = diag::err_int_to_block_pointer; 5401 break; 5402 case IncompatibleBlockPointer: 5403 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5404 break; 5405 case IncompatibleObjCQualifiedId: 5406 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5407 // it can give a more specific diagnostic. 5408 DiagKind = diag::warn_incompatible_qualified_id; 5409 break; 5410 case IncompatibleVectors: 5411 DiagKind = diag::warn_incompatible_vectors; 5412 break; 5413 case Incompatible: 5414 DiagKind = diag::err_typecheck_convert_incompatible; 5415 isInvalid = true; 5416 break; 5417 } 5418 5419 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5420 << SrcExpr->getSourceRange(); 5421 return isInvalid; 5422} 5423 5424bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5425 llvm::APSInt ICEResult; 5426 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5427 if (Result) 5428 *Result = ICEResult; 5429 return false; 5430 } 5431 5432 Expr::EvalResult EvalResult; 5433 5434 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5435 EvalResult.HasSideEffects) { 5436 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5437 5438 if (EvalResult.Diag) { 5439 // We only show the note if it's not the usual "invalid subexpression" 5440 // or if it's actually in a subexpression. 5441 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5442 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5443 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5444 } 5445 5446 return true; 5447 } 5448 5449 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5450 E->getSourceRange(); 5451 5452 if (EvalResult.Diag && 5453 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5454 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5455 5456 if (Result) 5457 *Result = EvalResult.Val.getInt(); 5458 return false; 5459} 5460 5461Sema::ExpressionEvaluationContext 5462Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5463 // Introduce a new set of potentially referenced declarations to the stack. 5464 if (NewContext == PotentiallyPotentiallyEvaluated) 5465 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5466 5467 std::swap(ExprEvalContext, NewContext); 5468 return NewContext; 5469} 5470 5471void 5472Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5473 ExpressionEvaluationContext NewContext) { 5474 ExprEvalContext = NewContext; 5475 5476 if (OldContext == PotentiallyPotentiallyEvaluated) { 5477 // Mark any remaining declarations in the current position of the stack 5478 // as "referenced". If they were not meant to be referenced, semantic 5479 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5480 PotentiallyReferencedDecls RemainingDecls; 5481 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5482 PotentiallyReferencedDeclStack.pop_back(); 5483 5484 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5485 IEnd = RemainingDecls.end(); 5486 I != IEnd; ++I) 5487 MarkDeclarationReferenced(I->first, I->second); 5488 } 5489} 5490 5491/// \brief Note that the given declaration was referenced in the source code. 5492/// 5493/// This routine should be invoke whenever a given declaration is referenced 5494/// in the source code, and where that reference occurred. If this declaration 5495/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5496/// C99 6.9p3), then the declaration will be marked as used. 5497/// 5498/// \param Loc the location where the declaration was referenced. 5499/// 5500/// \param D the declaration that has been referenced by the source code. 5501void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5502 assert(D && "No declaration?"); 5503 5504 if (D->isUsed()) 5505 return; 5506 5507 // Mark a parameter declaration "used", regardless of whether we're in a 5508 // template or not. 5509 if (isa<ParmVarDecl>(D)) 5510 D->setUsed(true); 5511 5512 // Do not mark anything as "used" within a dependent context; wait for 5513 // an instantiation. 5514 if (CurContext->isDependentContext()) 5515 return; 5516 5517 switch (ExprEvalContext) { 5518 case Unevaluated: 5519 // We are in an expression that is not potentially evaluated; do nothing. 5520 return; 5521 5522 case PotentiallyEvaluated: 5523 // We are in a potentially-evaluated expression, so this declaration is 5524 // "used"; handle this below. 5525 break; 5526 5527 case PotentiallyPotentiallyEvaluated: 5528 // We are in an expression that may be potentially evaluated; queue this 5529 // declaration reference until we know whether the expression is 5530 // potentially evaluated. 5531 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5532 return; 5533 } 5534 5535 // Note that this declaration has been used. 5536 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5537 unsigned TypeQuals; 5538 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5539 if (!Constructor->isUsed()) 5540 DefineImplicitDefaultConstructor(Loc, Constructor); 5541 } 5542 else if (Constructor->isImplicit() && 5543 Constructor->isCopyConstructor(Context, TypeQuals)) { 5544 if (!Constructor->isUsed()) 5545 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5546 } 5547 // FIXME: more checking for other implicits go here. 5548 else 5549 Constructor->setUsed(true); 5550 } 5551 else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5552 // Implicit instantiation of function templates 5553 if (!Function->getBody(Context)) { 5554 if (Function->getInstantiatedFromMemberFunction()) 5555 PendingImplicitInstantiations.push(std::make_pair(Function, Loc)); 5556 5557 // FIXME: check for function template specializations. 5558 } 5559 5560 5561 // FIXME: keep track of references to static functions 5562 Function->setUsed(true); 5563 return; 5564 } 5565 5566 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5567 (void)Var; 5568 // FIXME: implicit template instantiation 5569 // FIXME: keep track of references to static data? 5570 D->setUsed(true); 5571 } 5572} 5573 5574