SemaExpr.cpp revision 2885775090f6b4b011ce8b1cb6045e3b2202e9a1
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 62 MD->isInstanceMethod()); 63 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable 82 if (D->getAttr<UnavailableAttr>()) { 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 return false; 88} 89 90/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 91/// (and other functions in future), which have been declared with sentinel 92/// attribute. It warns if call does not have the sentinel argument. 93/// 94void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 95 Expr **Args, unsigned NumArgs) 96{ 97 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 98 if (!attr) 99 return; 100 int sentinelPos = attr->getSentinel(); 101 int nullPos = attr->getNullPos(); 102 103 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 104 // base class. Then we won't be needing two versions of the same code. 105 unsigned int i = 0; 106 bool warnNotEnoughArgs = false; 107 int isMethod = 0; 108 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 109 // skip over named parameters. 110 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 111 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 112 if (nullPos) 113 --nullPos; 114 else 115 ++i; 116 } 117 warnNotEnoughArgs = (P != E || i >= NumArgs); 118 isMethod = 1; 119 } 120 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 121 // skip over named parameters. 122 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 123 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 124 if (nullPos) 125 --nullPos; 126 else 127 ++i; 128 } 129 warnNotEnoughArgs = (P != E || i >= NumArgs); 130 } 131 else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 132 // block or function pointer call. 133 QualType Ty = V->getType(); 134 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 135 const FunctionType *FT = Ty->isFunctionPointerType() 136 ? Ty->getAsPointerType()->getPointeeType()->getAsFunctionType() 137 : Ty->getAsBlockPointerType()->getPointeeType()->getAsFunctionType(); 138 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 139 unsigned NumArgsInProto = Proto->getNumArgs(); 140 unsigned k; 141 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 142 if (nullPos) 143 --nullPos; 144 else 145 ++i; 146 } 147 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 148 } 149 if (Ty->isBlockPointerType()) 150 isMethod = 2; 151 } 152 else 153 return; 154 } 155 else 156 return; 157 158 if (warnNotEnoughArgs) { 159 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 160 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 161 return; 162 } 163 int sentinel = i; 164 while (sentinelPos > 0 && i < NumArgs-1) { 165 --sentinelPos; 166 ++i; 167 } 168 if (sentinelPos > 0) { 169 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 170 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 171 return; 172 } 173 while (i < NumArgs-1) { 174 ++i; 175 ++sentinel; 176 } 177 Expr *sentinelExpr = Args[sentinel]; 178 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 179 !sentinelExpr->isNullPointerConstant(Context))) { 180 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 181 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 182 } 183 return; 184} 185 186SourceRange Sema::getExprRange(ExprTy *E) const { 187 Expr *Ex = (Expr *)E; 188 return Ex? Ex->getSourceRange() : SourceRange(); 189} 190 191//===----------------------------------------------------------------------===// 192// Standard Promotions and Conversions 193//===----------------------------------------------------------------------===// 194 195/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 196void Sema::DefaultFunctionArrayConversion(Expr *&E) { 197 QualType Ty = E->getType(); 198 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 199 200 if (Ty->isFunctionType()) 201 ImpCastExprToType(E, Context.getPointerType(Ty)); 202 else if (Ty->isArrayType()) { 203 // In C90 mode, arrays only promote to pointers if the array expression is 204 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 205 // type 'array of type' is converted to an expression that has type 'pointer 206 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 207 // that has type 'array of type' ...". The relevant change is "an lvalue" 208 // (C90) to "an expression" (C99). 209 // 210 // C++ 4.2p1: 211 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 212 // T" can be converted to an rvalue of type "pointer to T". 213 // 214 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 215 E->isLvalue(Context) == Expr::LV_Valid) 216 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 217 } 218} 219 220/// \brief Whether this is a promotable bitfield reference according 221/// to C99 6.3.1.1p2, bullet 2. 222/// 223/// \returns the type this bit-field will promote to, or NULL if no 224/// promotion occurs. 225static QualType isPromotableBitField(Expr *E, ASTContext &Context) { 226 FieldDecl *Field = E->getBitField(); 227 if (!Field) 228 return QualType(); 229 230 const BuiltinType *BT = Field->getType()->getAsBuiltinType(); 231 if (!BT) 232 return QualType(); 233 234 if (BT->getKind() != BuiltinType::Bool && 235 BT->getKind() != BuiltinType::Int && 236 BT->getKind() != BuiltinType::UInt) 237 return QualType(); 238 239 llvm::APSInt BitWidthAP; 240 if (!Field->getBitWidth()->isIntegerConstantExpr(BitWidthAP, Context)) 241 return QualType(); 242 243 uint64_t BitWidth = BitWidthAP.getZExtValue(); 244 uint64_t IntSize = Context.getTypeSize(Context.IntTy); 245 if (BitWidth < IntSize || 246 (Field->getType()->isSignedIntegerType() && BitWidth == IntSize)) 247 return Context.IntTy; 248 249 if (BitWidth == IntSize && Field->getType()->isUnsignedIntegerType()) 250 return Context.UnsignedIntTy; 251 252 return QualType(); 253} 254 255/// UsualUnaryConversions - Performs various conversions that are common to most 256/// operators (C99 6.3). The conversions of array and function types are 257/// sometimes surpressed. For example, the array->pointer conversion doesn't 258/// apply if the array is an argument to the sizeof or address (&) operators. 259/// In these instances, this routine should *not* be called. 260Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 261 QualType Ty = Expr->getType(); 262 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 263 264 // C99 6.3.1.1p2: 265 // 266 // The following may be used in an expression wherever an int or 267 // unsigned int may be used: 268 // - an object or expression with an integer type whose integer 269 // conversion rank is less than or equal to the rank of int 270 // and unsigned int. 271 // - A bit-field of type _Bool, int, signed int, or unsigned int. 272 // 273 // If an int can represent all values of the original type, the 274 // value is converted to an int; otherwise, it is converted to an 275 // unsigned int. These are called the integer promotions. All 276 // other types are unchanged by the integer promotions. 277 if (Ty->isPromotableIntegerType()) { 278 ImpCastExprToType(Expr, Context.IntTy); 279 return Expr; 280 } else { 281 QualType T = isPromotableBitField(Expr, Context); 282 if (!T.isNull()) { 283 ImpCastExprToType(Expr, T); 284 return Expr; 285 } 286 } 287 288 DefaultFunctionArrayConversion(Expr); 289 return Expr; 290} 291 292/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 293/// do not have a prototype. Arguments that have type float are promoted to 294/// double. All other argument types are converted by UsualUnaryConversions(). 295void Sema::DefaultArgumentPromotion(Expr *&Expr) { 296 QualType Ty = Expr->getType(); 297 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 298 299 // If this is a 'float' (CVR qualified or typedef) promote to double. 300 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 301 if (BT->getKind() == BuiltinType::Float) 302 return ImpCastExprToType(Expr, Context.DoubleTy); 303 304 UsualUnaryConversions(Expr); 305} 306 307/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 308/// will warn if the resulting type is not a POD type, and rejects ObjC 309/// interfaces passed by value. This returns true if the argument type is 310/// completely illegal. 311bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 312 DefaultArgumentPromotion(Expr); 313 314 if (Expr->getType()->isObjCInterfaceType()) { 315 Diag(Expr->getLocStart(), 316 diag::err_cannot_pass_objc_interface_to_vararg) 317 << Expr->getType() << CT; 318 return true; 319 } 320 321 if (!Expr->getType()->isPODType()) 322 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 323 << Expr->getType() << CT; 324 325 return false; 326} 327 328 329/// UsualArithmeticConversions - Performs various conversions that are common to 330/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 331/// routine returns the first non-arithmetic type found. The client is 332/// responsible for emitting appropriate error diagnostics. 333/// FIXME: verify the conversion rules for "complex int" are consistent with 334/// GCC. 335QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 336 bool isCompAssign) { 337 if (!isCompAssign) 338 UsualUnaryConversions(lhsExpr); 339 340 UsualUnaryConversions(rhsExpr); 341 342 // For conversion purposes, we ignore any qualifiers. 343 // For example, "const float" and "float" are equivalent. 344 QualType lhs = 345 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 346 QualType rhs = 347 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 348 349 // If both types are identical, no conversion is needed. 350 if (lhs == rhs) 351 return lhs; 352 353 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 354 // The caller can deal with this (e.g. pointer + int). 355 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 356 return lhs; 357 358 // Perform bitfield promotions. 359 QualType LHSBitfieldPromoteTy = isPromotableBitField(lhsExpr, Context); 360 if (!LHSBitfieldPromoteTy.isNull()) 361 lhs = LHSBitfieldPromoteTy; 362 QualType RHSBitfieldPromoteTy = isPromotableBitField(rhsExpr, Context); 363 if (!RHSBitfieldPromoteTy.isNull()) 364 rhs = RHSBitfieldPromoteTy; 365 366 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 367 if (!isCompAssign) 368 ImpCastExprToType(lhsExpr, destType); 369 ImpCastExprToType(rhsExpr, destType); 370 return destType; 371} 372 373QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 374 // Perform the usual unary conversions. We do this early so that 375 // integral promotions to "int" can allow us to exit early, in the 376 // lhs == rhs check. Also, for conversion purposes, we ignore any 377 // qualifiers. For example, "const float" and "float" are 378 // equivalent. 379 if (lhs->isPromotableIntegerType()) 380 lhs = Context.IntTy; 381 else 382 lhs = lhs.getUnqualifiedType(); 383 if (rhs->isPromotableIntegerType()) 384 rhs = Context.IntTy; 385 else 386 rhs = rhs.getUnqualifiedType(); 387 388 // If both types are identical, no conversion is needed. 389 if (lhs == rhs) 390 return lhs; 391 392 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 393 // The caller can deal with this (e.g. pointer + int). 394 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 395 return lhs; 396 397 // At this point, we have two different arithmetic types. 398 399 // Handle complex types first (C99 6.3.1.8p1). 400 if (lhs->isComplexType() || rhs->isComplexType()) { 401 // if we have an integer operand, the result is the complex type. 402 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 403 // convert the rhs to the lhs complex type. 404 return lhs; 405 } 406 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 407 // convert the lhs to the rhs complex type. 408 return rhs; 409 } 410 // This handles complex/complex, complex/float, or float/complex. 411 // When both operands are complex, the shorter operand is converted to the 412 // type of the longer, and that is the type of the result. This corresponds 413 // to what is done when combining two real floating-point operands. 414 // The fun begins when size promotion occur across type domains. 415 // From H&S 6.3.4: When one operand is complex and the other is a real 416 // floating-point type, the less precise type is converted, within it's 417 // real or complex domain, to the precision of the other type. For example, 418 // when combining a "long double" with a "double _Complex", the 419 // "double _Complex" is promoted to "long double _Complex". 420 int result = Context.getFloatingTypeOrder(lhs, rhs); 421 422 if (result > 0) { // The left side is bigger, convert rhs. 423 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 424 } else if (result < 0) { // The right side is bigger, convert lhs. 425 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 426 } 427 // At this point, lhs and rhs have the same rank/size. Now, make sure the 428 // domains match. This is a requirement for our implementation, C99 429 // does not require this promotion. 430 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 431 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 432 return rhs; 433 } else { // handle "_Complex double, double". 434 return lhs; 435 } 436 } 437 return lhs; // The domain/size match exactly. 438 } 439 // Now handle "real" floating types (i.e. float, double, long double). 440 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 441 // if we have an integer operand, the result is the real floating type. 442 if (rhs->isIntegerType()) { 443 // convert rhs to the lhs floating point type. 444 return lhs; 445 } 446 if (rhs->isComplexIntegerType()) { 447 // convert rhs to the complex floating point type. 448 return Context.getComplexType(lhs); 449 } 450 if (lhs->isIntegerType()) { 451 // convert lhs to the rhs floating point type. 452 return rhs; 453 } 454 if (lhs->isComplexIntegerType()) { 455 // convert lhs to the complex floating point type. 456 return Context.getComplexType(rhs); 457 } 458 // We have two real floating types, float/complex combos were handled above. 459 // Convert the smaller operand to the bigger result. 460 int result = Context.getFloatingTypeOrder(lhs, rhs); 461 if (result > 0) // convert the rhs 462 return lhs; 463 assert(result < 0 && "illegal float comparison"); 464 return rhs; // convert the lhs 465 } 466 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 467 // Handle GCC complex int extension. 468 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 469 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 470 471 if (lhsComplexInt && rhsComplexInt) { 472 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 473 rhsComplexInt->getElementType()) >= 0) 474 return lhs; // convert the rhs 475 return rhs; 476 } else if (lhsComplexInt && rhs->isIntegerType()) { 477 // convert the rhs to the lhs complex type. 478 return lhs; 479 } else if (rhsComplexInt && lhs->isIntegerType()) { 480 // convert the lhs to the rhs complex type. 481 return rhs; 482 } 483 } 484 // Finally, we have two differing integer types. 485 // The rules for this case are in C99 6.3.1.8 486 int compare = Context.getIntegerTypeOrder(lhs, rhs); 487 bool lhsSigned = lhs->isSignedIntegerType(), 488 rhsSigned = rhs->isSignedIntegerType(); 489 QualType destType; 490 if (lhsSigned == rhsSigned) { 491 // Same signedness; use the higher-ranked type 492 destType = compare >= 0 ? lhs : rhs; 493 } else if (compare != (lhsSigned ? 1 : -1)) { 494 // The unsigned type has greater than or equal rank to the 495 // signed type, so use the unsigned type 496 destType = lhsSigned ? rhs : lhs; 497 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 498 // The two types are different widths; if we are here, that 499 // means the signed type is larger than the unsigned type, so 500 // use the signed type. 501 destType = lhsSigned ? lhs : rhs; 502 } else { 503 // The signed type is higher-ranked than the unsigned type, 504 // but isn't actually any bigger (like unsigned int and long 505 // on most 32-bit systems). Use the unsigned type corresponding 506 // to the signed type. 507 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 508 } 509 return destType; 510} 511 512//===----------------------------------------------------------------------===// 513// Semantic Analysis for various Expression Types 514//===----------------------------------------------------------------------===// 515 516 517/// ActOnStringLiteral - The specified tokens were lexed as pasted string 518/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 519/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 520/// multiple tokens. However, the common case is that StringToks points to one 521/// string. 522/// 523Action::OwningExprResult 524Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 525 assert(NumStringToks && "Must have at least one string!"); 526 527 StringLiteralParser Literal(StringToks, NumStringToks, PP); 528 if (Literal.hadError) 529 return ExprError(); 530 531 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 532 for (unsigned i = 0; i != NumStringToks; ++i) 533 StringTokLocs.push_back(StringToks[i].getLocation()); 534 535 QualType StrTy = Context.CharTy; 536 if (Literal.AnyWide) StrTy = Context.getWCharType(); 537 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 538 539 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 540 if (getLangOptions().CPlusPlus) 541 StrTy.addConst(); 542 543 // Get an array type for the string, according to C99 6.4.5. This includes 544 // the nul terminator character as well as the string length for pascal 545 // strings. 546 StrTy = Context.getConstantArrayType(StrTy, 547 llvm::APInt(32, Literal.GetNumStringChars()+1), 548 ArrayType::Normal, 0); 549 550 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 551 return Owned(StringLiteral::Create(Context, Literal.GetString(), 552 Literal.GetStringLength(), 553 Literal.AnyWide, StrTy, 554 &StringTokLocs[0], 555 StringTokLocs.size())); 556} 557 558/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 559/// CurBlock to VD should cause it to be snapshotted (as we do for auto 560/// variables defined outside the block) or false if this is not needed (e.g. 561/// for values inside the block or for globals). 562/// 563/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 564/// up-to-date. 565/// 566static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 567 ValueDecl *VD) { 568 // If the value is defined inside the block, we couldn't snapshot it even if 569 // we wanted to. 570 if (CurBlock->TheDecl == VD->getDeclContext()) 571 return false; 572 573 // If this is an enum constant or function, it is constant, don't snapshot. 574 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 575 return false; 576 577 // If this is a reference to an extern, static, or global variable, no need to 578 // snapshot it. 579 // FIXME: What about 'const' variables in C++? 580 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 581 if (!Var->hasLocalStorage()) 582 return false; 583 584 // Blocks that have these can't be constant. 585 CurBlock->hasBlockDeclRefExprs = true; 586 587 // If we have nested blocks, the decl may be declared in an outer block (in 588 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 589 // be defined outside all of the current blocks (in which case the blocks do 590 // all get the bit). Walk the nesting chain. 591 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 592 NextBlock = NextBlock->PrevBlockInfo) { 593 // If we found the defining block for the variable, don't mark the block as 594 // having a reference outside it. 595 if (NextBlock->TheDecl == VD->getDeclContext()) 596 break; 597 598 // Otherwise, the DeclRef from the inner block causes the outer one to need 599 // a snapshot as well. 600 NextBlock->hasBlockDeclRefExprs = true; 601 } 602 603 return true; 604} 605 606 607 608/// ActOnIdentifierExpr - The parser read an identifier in expression context, 609/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 610/// identifier is used in a function call context. 611/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 612/// class or namespace that the identifier must be a member of. 613Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 614 IdentifierInfo &II, 615 bool HasTrailingLParen, 616 const CXXScopeSpec *SS, 617 bool isAddressOfOperand) { 618 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 619 isAddressOfOperand); 620} 621 622/// BuildDeclRefExpr - Build either a DeclRefExpr or a 623/// QualifiedDeclRefExpr based on whether or not SS is a 624/// nested-name-specifier. 625Sema::OwningExprResult 626Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 627 bool TypeDependent, bool ValueDependent, 628 const CXXScopeSpec *SS) { 629 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 630 Diag(Loc, 631 diag::err_auto_variable_cannot_appear_in_own_initializer) 632 << D->getDeclName(); 633 return ExprError(); 634 } 635 636 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 637 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 638 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 639 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 640 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 641 << D->getIdentifier() << FD->getDeclName(); 642 Diag(D->getLocation(), diag::note_local_variable_declared_here) 643 << D->getIdentifier(); 644 return ExprError(); 645 } 646 } 647 } 648 } 649 650 MarkDeclarationReferenced(Loc, D); 651 652 Expr *E; 653 if (SS && !SS->isEmpty()) { 654 E = new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 655 ValueDependent, SS->getRange(), 656 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 657 } else 658 E = new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 659 660 return Owned(E); 661} 662 663/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 664/// variable corresponding to the anonymous union or struct whose type 665/// is Record. 666static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 667 RecordDecl *Record) { 668 assert(Record->isAnonymousStructOrUnion() && 669 "Record must be an anonymous struct or union!"); 670 671 // FIXME: Once Decls are directly linked together, this will be an O(1) 672 // operation rather than a slow walk through DeclContext's vector (which 673 // itself will be eliminated). DeclGroups might make this even better. 674 DeclContext *Ctx = Record->getDeclContext(); 675 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 676 DEnd = Ctx->decls_end(); 677 D != DEnd; ++D) { 678 if (*D == Record) { 679 // The object for the anonymous struct/union directly 680 // follows its type in the list of declarations. 681 ++D; 682 assert(D != DEnd && "Missing object for anonymous record"); 683 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 684 return *D; 685 } 686 } 687 688 assert(false && "Missing object for anonymous record"); 689 return 0; 690} 691 692/// \brief Given a field that represents a member of an anonymous 693/// struct/union, build the path from that field's context to the 694/// actual member. 695/// 696/// Construct the sequence of field member references we'll have to 697/// perform to get to the field in the anonymous union/struct. The 698/// list of members is built from the field outward, so traverse it 699/// backwards to go from an object in the current context to the field 700/// we found. 701/// 702/// \returns The variable from which the field access should begin, 703/// for an anonymous struct/union that is not a member of another 704/// class. Otherwise, returns NULL. 705VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 706 llvm::SmallVectorImpl<FieldDecl *> &Path) { 707 assert(Field->getDeclContext()->isRecord() && 708 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 709 && "Field must be stored inside an anonymous struct or union"); 710 711 Path.push_back(Field); 712 VarDecl *BaseObject = 0; 713 DeclContext *Ctx = Field->getDeclContext(); 714 do { 715 RecordDecl *Record = cast<RecordDecl>(Ctx); 716 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 717 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 718 Path.push_back(AnonField); 719 else { 720 BaseObject = cast<VarDecl>(AnonObject); 721 break; 722 } 723 Ctx = Ctx->getParent(); 724 } while (Ctx->isRecord() && 725 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 726 727 return BaseObject; 728} 729 730Sema::OwningExprResult 731Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 732 FieldDecl *Field, 733 Expr *BaseObjectExpr, 734 SourceLocation OpLoc) { 735 llvm::SmallVector<FieldDecl *, 4> AnonFields; 736 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 737 AnonFields); 738 739 // Build the expression that refers to the base object, from 740 // which we will build a sequence of member references to each 741 // of the anonymous union objects and, eventually, the field we 742 // found via name lookup. 743 bool BaseObjectIsPointer = false; 744 unsigned ExtraQuals = 0; 745 if (BaseObject) { 746 // BaseObject is an anonymous struct/union variable (and is, 747 // therefore, not part of another non-anonymous record). 748 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 749 MarkDeclarationReferenced(Loc, BaseObject); 750 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 751 SourceLocation()); 752 ExtraQuals 753 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 754 } else if (BaseObjectExpr) { 755 // The caller provided the base object expression. Determine 756 // whether its a pointer and whether it adds any qualifiers to the 757 // anonymous struct/union fields we're looking into. 758 QualType ObjectType = BaseObjectExpr->getType(); 759 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 760 BaseObjectIsPointer = true; 761 ObjectType = ObjectPtr->getPointeeType(); 762 } 763 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 764 } else { 765 // We've found a member of an anonymous struct/union that is 766 // inside a non-anonymous struct/union, so in a well-formed 767 // program our base object expression is "this". 768 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 769 if (!MD->isStatic()) { 770 QualType AnonFieldType 771 = Context.getTagDeclType( 772 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 773 QualType ThisType = Context.getTagDeclType(MD->getParent()); 774 if ((Context.getCanonicalType(AnonFieldType) 775 == Context.getCanonicalType(ThisType)) || 776 IsDerivedFrom(ThisType, AnonFieldType)) { 777 // Our base object expression is "this". 778 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 779 MD->getThisType(Context)); 780 BaseObjectIsPointer = true; 781 } 782 } else { 783 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 784 << Field->getDeclName()); 785 } 786 ExtraQuals = MD->getTypeQualifiers(); 787 } 788 789 if (!BaseObjectExpr) 790 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 791 << Field->getDeclName()); 792 } 793 794 // Build the implicit member references to the field of the 795 // anonymous struct/union. 796 Expr *Result = BaseObjectExpr; 797 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 798 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 799 FI != FIEnd; ++FI) { 800 QualType MemberType = (*FI)->getType(); 801 if (!(*FI)->isMutable()) { 802 unsigned combinedQualifiers 803 = MemberType.getCVRQualifiers() | ExtraQuals; 804 MemberType = MemberType.getQualifiedType(combinedQualifiers); 805 } 806 MarkDeclarationReferenced(Loc, *FI); 807 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 808 OpLoc, MemberType); 809 BaseObjectIsPointer = false; 810 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 811 } 812 813 return Owned(Result); 814} 815 816/// ActOnDeclarationNameExpr - The parser has read some kind of name 817/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 818/// performs lookup on that name and returns an expression that refers 819/// to that name. This routine isn't directly called from the parser, 820/// because the parser doesn't know about DeclarationName. Rather, 821/// this routine is called by ActOnIdentifierExpr, 822/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 823/// which form the DeclarationName from the corresponding syntactic 824/// forms. 825/// 826/// HasTrailingLParen indicates whether this identifier is used in a 827/// function call context. LookupCtx is only used for a C++ 828/// qualified-id (foo::bar) to indicate the class or namespace that 829/// the identifier must be a member of. 830/// 831/// isAddressOfOperand means that this expression is the direct operand 832/// of an address-of operator. This matters because this is the only 833/// situation where a qualified name referencing a non-static member may 834/// appear outside a member function of this class. 835Sema::OwningExprResult 836Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 837 DeclarationName Name, bool HasTrailingLParen, 838 const CXXScopeSpec *SS, 839 bool isAddressOfOperand) { 840 // Could be enum-constant, value decl, instance variable, etc. 841 if (SS && SS->isInvalid()) 842 return ExprError(); 843 844 // C++ [temp.dep.expr]p3: 845 // An id-expression is type-dependent if it contains: 846 // -- a nested-name-specifier that contains a class-name that 847 // names a dependent type. 848 // FIXME: Member of the current instantiation. 849 if (SS && isDependentScopeSpecifier(*SS)) { 850 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 851 Loc, SS->getRange(), 852 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 853 } 854 855 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 856 false, true, Loc); 857 858 if (Lookup.isAmbiguous()) { 859 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 860 SS && SS->isSet() ? SS->getRange() 861 : SourceRange()); 862 return ExprError(); 863 } 864 865 NamedDecl *D = Lookup.getAsDecl(); 866 867 // If this reference is in an Objective-C method, then ivar lookup happens as 868 // well. 869 IdentifierInfo *II = Name.getAsIdentifierInfo(); 870 if (II && getCurMethodDecl()) { 871 // There are two cases to handle here. 1) scoped lookup could have failed, 872 // in which case we should look for an ivar. 2) scoped lookup could have 873 // found a decl, but that decl is outside the current instance method (i.e. 874 // a global variable). In these two cases, we do a lookup for an ivar with 875 // this name, if the lookup sucedes, we replace it our current decl. 876 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 877 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 878 ObjCInterfaceDecl *ClassDeclared; 879 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 880 // Check if referencing a field with __attribute__((deprecated)). 881 if (DiagnoseUseOfDecl(IV, Loc)) 882 return ExprError(); 883 884 // If we're referencing an invalid decl, just return this as a silent 885 // error node. The error diagnostic was already emitted on the decl. 886 if (IV->isInvalidDecl()) 887 return ExprError(); 888 889 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 890 // If a class method attemps to use a free standing ivar, this is 891 // an error. 892 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 893 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 894 << IV->getDeclName()); 895 // If a class method uses a global variable, even if an ivar with 896 // same name exists, use the global. 897 if (!IsClsMethod) { 898 if (IV->getAccessControl() == ObjCIvarDecl::Private && 899 ClassDeclared != IFace) 900 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 901 // FIXME: This should use a new expr for a direct reference, don't 902 // turn this into Self->ivar, just return a BareIVarExpr or something. 903 IdentifierInfo &II = Context.Idents.get("self"); 904 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 905 MarkDeclarationReferenced(Loc, IV); 906 return Owned(new (Context) 907 ObjCIvarRefExpr(IV, IV->getType(), Loc, 908 SelfExpr.takeAs<Expr>(), true, true)); 909 } 910 } 911 } 912 else if (getCurMethodDecl()->isInstanceMethod()) { 913 // We should warn if a local variable hides an ivar. 914 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 915 ObjCInterfaceDecl *ClassDeclared; 916 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 917 if (IV->getAccessControl() != ObjCIvarDecl::Private || 918 IFace == ClassDeclared) 919 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 920 } 921 } 922 // Needed to implement property "super.method" notation. 923 if (D == 0 && II->isStr("super")) { 924 QualType T; 925 926 if (getCurMethodDecl()->isInstanceMethod()) 927 T = Context.getPointerType(Context.getObjCInterfaceType( 928 getCurMethodDecl()->getClassInterface())); 929 else 930 T = Context.getObjCClassType(); 931 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 932 } 933 } 934 935 // Determine whether this name might be a candidate for 936 // argument-dependent lookup. 937 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 938 HasTrailingLParen; 939 940 if (ADL && D == 0) { 941 // We've seen something of the form 942 // 943 // identifier( 944 // 945 // and we did not find any entity by the name 946 // "identifier". However, this identifier is still subject to 947 // argument-dependent lookup, so keep track of the name. 948 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 949 Context.OverloadTy, 950 Loc)); 951 } 952 953 if (D == 0) { 954 // Otherwise, this could be an implicitly declared function reference (legal 955 // in C90, extension in C99). 956 if (HasTrailingLParen && II && 957 !getLangOptions().CPlusPlus) // Not in C++. 958 D = ImplicitlyDefineFunction(Loc, *II, S); 959 else { 960 // If this name wasn't predeclared and if this is not a function call, 961 // diagnose the problem. 962 if (SS && !SS->isEmpty()) 963 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 964 << Name << SS->getRange()); 965 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 966 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 967 return ExprError(Diag(Loc, diag::err_undeclared_use) 968 << Name.getAsString()); 969 else 970 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 971 } 972 } 973 974 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 975 // Warn about constructs like: 976 // if (void *X = foo()) { ... } else { X }. 977 // In the else block, the pointer is always false. 978 979 // FIXME: In a template instantiation, we don't have scope 980 // information to check this property. 981 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 982 Scope *CheckS = S; 983 while (CheckS) { 984 if (CheckS->isWithinElse() && 985 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 986 if (Var->getType()->isBooleanType()) 987 ExprError(Diag(Loc, diag::warn_value_always_false) 988 << Var->getDeclName()); 989 else 990 ExprError(Diag(Loc, diag::warn_value_always_zero) 991 << Var->getDeclName()); 992 break; 993 } 994 995 // Move up one more control parent to check again. 996 CheckS = CheckS->getControlParent(); 997 if (CheckS) 998 CheckS = CheckS->getParent(); 999 } 1000 } 1001 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 1002 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1003 // C99 DR 316 says that, if a function type comes from a 1004 // function definition (without a prototype), that type is only 1005 // used for checking compatibility. Therefore, when referencing 1006 // the function, we pretend that we don't have the full function 1007 // type. 1008 if (DiagnoseUseOfDecl(Func, Loc)) 1009 return ExprError(); 1010 1011 QualType T = Func->getType(); 1012 QualType NoProtoType = T; 1013 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1014 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1015 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 1016 } 1017 } 1018 1019 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 1020} 1021 1022/// \brief Complete semantic analysis for a reference to the given declaration. 1023Sema::OwningExprResult 1024Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 1025 bool HasTrailingLParen, 1026 const CXXScopeSpec *SS, 1027 bool isAddressOfOperand) { 1028 assert(D && "Cannot refer to a NULL declaration"); 1029 DeclarationName Name = D->getDeclName(); 1030 1031 // If this is an expression of the form &Class::member, don't build an 1032 // implicit member ref, because we want a pointer to the member in general, 1033 // not any specific instance's member. 1034 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 1035 DeclContext *DC = computeDeclContext(*SS); 1036 if (D && isa<CXXRecordDecl>(DC)) { 1037 QualType DType; 1038 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1039 DType = FD->getType().getNonReferenceType(); 1040 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1041 DType = Method->getType(); 1042 } else if (isa<OverloadedFunctionDecl>(D)) { 1043 DType = Context.OverloadTy; 1044 } 1045 // Could be an inner type. That's diagnosed below, so ignore it here. 1046 if (!DType.isNull()) { 1047 // The pointer is type- and value-dependent if it points into something 1048 // dependent. 1049 bool Dependent = DC->isDependentContext(); 1050 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 1051 } 1052 } 1053 } 1054 1055 // We may have found a field within an anonymous union or struct 1056 // (C++ [class.union]). 1057 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 1058 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1059 return BuildAnonymousStructUnionMemberReference(Loc, FD); 1060 1061 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1062 if (!MD->isStatic()) { 1063 // C++ [class.mfct.nonstatic]p2: 1064 // [...] if name lookup (3.4.1) resolves the name in the 1065 // id-expression to a nonstatic nontype member of class X or of 1066 // a base class of X, the id-expression is transformed into a 1067 // class member access expression (5.2.5) using (*this) (9.3.2) 1068 // as the postfix-expression to the left of the '.' operator. 1069 DeclContext *Ctx = 0; 1070 QualType MemberType; 1071 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1072 Ctx = FD->getDeclContext(); 1073 MemberType = FD->getType(); 1074 1075 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 1076 MemberType = RefType->getPointeeType(); 1077 else if (!FD->isMutable()) { 1078 unsigned combinedQualifiers 1079 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1080 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1081 } 1082 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1083 if (!Method->isStatic()) { 1084 Ctx = Method->getParent(); 1085 MemberType = Method->getType(); 1086 } 1087 } else if (OverloadedFunctionDecl *Ovl 1088 = dyn_cast<OverloadedFunctionDecl>(D)) { 1089 for (OverloadedFunctionDecl::function_iterator 1090 Func = Ovl->function_begin(), 1091 FuncEnd = Ovl->function_end(); 1092 Func != FuncEnd; ++Func) { 1093 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1094 if (!DMethod->isStatic()) { 1095 Ctx = Ovl->getDeclContext(); 1096 MemberType = Context.OverloadTy; 1097 break; 1098 } 1099 } 1100 } 1101 1102 if (Ctx && Ctx->isRecord()) { 1103 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1104 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1105 if ((Context.getCanonicalType(CtxType) 1106 == Context.getCanonicalType(ThisType)) || 1107 IsDerivedFrom(ThisType, CtxType)) { 1108 // Build the implicit member access expression. 1109 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1110 MD->getThisType(Context)); 1111 MarkDeclarationReferenced(Loc, D); 1112 return Owned(new (Context) MemberExpr(This, true, D, 1113 Loc, MemberType)); 1114 } 1115 } 1116 } 1117 } 1118 1119 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1120 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1121 if (MD->isStatic()) 1122 // "invalid use of member 'x' in static member function" 1123 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1124 << FD->getDeclName()); 1125 } 1126 1127 // Any other ways we could have found the field in a well-formed 1128 // program would have been turned into implicit member expressions 1129 // above. 1130 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1131 << FD->getDeclName()); 1132 } 1133 1134 if (isa<TypedefDecl>(D)) 1135 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1136 if (isa<ObjCInterfaceDecl>(D)) 1137 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1138 if (isa<NamespaceDecl>(D)) 1139 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1140 1141 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1142 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1143 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1144 false, false, SS); 1145 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1146 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1147 false, false, SS); 1148 ValueDecl *VD = cast<ValueDecl>(D); 1149 1150 // Check whether this declaration can be used. Note that we suppress 1151 // this check when we're going to perform argument-dependent lookup 1152 // on this function name, because this might not be the function 1153 // that overload resolution actually selects. 1154 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1155 HasTrailingLParen; 1156 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1157 return ExprError(); 1158 1159 // Only create DeclRefExpr's for valid Decl's. 1160 if (VD->isInvalidDecl()) 1161 return ExprError(); 1162 1163 // If the identifier reference is inside a block, and it refers to a value 1164 // that is outside the block, create a BlockDeclRefExpr instead of a 1165 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1166 // the block is formed. 1167 // 1168 // We do not do this for things like enum constants, global variables, etc, 1169 // as they do not get snapshotted. 1170 // 1171 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1172 MarkDeclarationReferenced(Loc, VD); 1173 QualType ExprTy = VD->getType().getNonReferenceType(); 1174 // The BlocksAttr indicates the variable is bound by-reference. 1175 if (VD->getAttr<BlocksAttr>()) 1176 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1177 // This is to record that a 'const' was actually synthesize and added. 1178 bool constAdded = !ExprTy.isConstQualified(); 1179 // Variable will be bound by-copy, make it const within the closure. 1180 1181 ExprTy.addConst(); 1182 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1183 constAdded)); 1184 } 1185 // If this reference is not in a block or if the referenced variable is 1186 // within the block, create a normal DeclRefExpr. 1187 1188 bool TypeDependent = false; 1189 bool ValueDependent = false; 1190 if (getLangOptions().CPlusPlus) { 1191 // C++ [temp.dep.expr]p3: 1192 // An id-expression is type-dependent if it contains: 1193 // - an identifier that was declared with a dependent type, 1194 if (VD->getType()->isDependentType()) 1195 TypeDependent = true; 1196 // - FIXME: a template-id that is dependent, 1197 // - a conversion-function-id that specifies a dependent type, 1198 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1199 Name.getCXXNameType()->isDependentType()) 1200 TypeDependent = true; 1201 // - a nested-name-specifier that contains a class-name that 1202 // names a dependent type. 1203 else if (SS && !SS->isEmpty()) { 1204 for (DeclContext *DC = computeDeclContext(*SS); 1205 DC; DC = DC->getParent()) { 1206 // FIXME: could stop early at namespace scope. 1207 if (DC->isRecord()) { 1208 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1209 if (Context.getTypeDeclType(Record)->isDependentType()) { 1210 TypeDependent = true; 1211 break; 1212 } 1213 } 1214 } 1215 } 1216 1217 // C++ [temp.dep.constexpr]p2: 1218 // 1219 // An identifier is value-dependent if it is: 1220 // - a name declared with a dependent type, 1221 if (TypeDependent) 1222 ValueDependent = true; 1223 // - the name of a non-type template parameter, 1224 else if (isa<NonTypeTemplateParmDecl>(VD)) 1225 ValueDependent = true; 1226 // - a constant with integral or enumeration type and is 1227 // initialized with an expression that is value-dependent 1228 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1229 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1230 Dcl->getInit()) { 1231 ValueDependent = Dcl->getInit()->isValueDependent(); 1232 } 1233 } 1234 } 1235 1236 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1237 TypeDependent, ValueDependent, SS); 1238} 1239 1240Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1241 tok::TokenKind Kind) { 1242 PredefinedExpr::IdentType IT; 1243 1244 switch (Kind) { 1245 default: assert(0 && "Unknown simple primary expr!"); 1246 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1247 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1248 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1249 } 1250 1251 // Pre-defined identifiers are of type char[x], where x is the length of the 1252 // string. 1253 unsigned Length; 1254 if (FunctionDecl *FD = getCurFunctionDecl()) 1255 Length = FD->getIdentifier()->getLength(); 1256 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1257 Length = MD->getSynthesizedMethodSize(); 1258 else { 1259 Diag(Loc, diag::ext_predef_outside_function); 1260 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1261 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1262 } 1263 1264 1265 llvm::APInt LengthI(32, Length + 1); 1266 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1267 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1268 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1269} 1270 1271Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1272 llvm::SmallString<16> CharBuffer; 1273 CharBuffer.resize(Tok.getLength()); 1274 const char *ThisTokBegin = &CharBuffer[0]; 1275 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1276 1277 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1278 Tok.getLocation(), PP); 1279 if (Literal.hadError()) 1280 return ExprError(); 1281 1282 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1283 1284 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1285 Literal.isWide(), 1286 type, Tok.getLocation())); 1287} 1288 1289Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1290 // Fast path for a single digit (which is quite common). A single digit 1291 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1292 if (Tok.getLength() == 1) { 1293 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1294 unsigned IntSize = Context.Target.getIntWidth(); 1295 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1296 Context.IntTy, Tok.getLocation())); 1297 } 1298 1299 llvm::SmallString<512> IntegerBuffer; 1300 // Add padding so that NumericLiteralParser can overread by one character. 1301 IntegerBuffer.resize(Tok.getLength()+1); 1302 const char *ThisTokBegin = &IntegerBuffer[0]; 1303 1304 // Get the spelling of the token, which eliminates trigraphs, etc. 1305 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1306 1307 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1308 Tok.getLocation(), PP); 1309 if (Literal.hadError) 1310 return ExprError(); 1311 1312 Expr *Res; 1313 1314 if (Literal.isFloatingLiteral()) { 1315 QualType Ty; 1316 if (Literal.isFloat) 1317 Ty = Context.FloatTy; 1318 else if (!Literal.isLong) 1319 Ty = Context.DoubleTy; 1320 else 1321 Ty = Context.LongDoubleTy; 1322 1323 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1324 1325 // isExact will be set by GetFloatValue(). 1326 bool isExact = false; 1327 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1328 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1329 1330 } else if (!Literal.isIntegerLiteral()) { 1331 return ExprError(); 1332 } else { 1333 QualType Ty; 1334 1335 // long long is a C99 feature. 1336 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1337 Literal.isLongLong) 1338 Diag(Tok.getLocation(), diag::ext_longlong); 1339 1340 // Get the value in the widest-possible width. 1341 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1342 1343 if (Literal.GetIntegerValue(ResultVal)) { 1344 // If this value didn't fit into uintmax_t, warn and force to ull. 1345 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1346 Ty = Context.UnsignedLongLongTy; 1347 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1348 "long long is not intmax_t?"); 1349 } else { 1350 // If this value fits into a ULL, try to figure out what else it fits into 1351 // according to the rules of C99 6.4.4.1p5. 1352 1353 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1354 // be an unsigned int. 1355 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1356 1357 // Check from smallest to largest, picking the smallest type we can. 1358 unsigned Width = 0; 1359 if (!Literal.isLong && !Literal.isLongLong) { 1360 // Are int/unsigned possibilities? 1361 unsigned IntSize = Context.Target.getIntWidth(); 1362 1363 // Does it fit in a unsigned int? 1364 if (ResultVal.isIntN(IntSize)) { 1365 // Does it fit in a signed int? 1366 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1367 Ty = Context.IntTy; 1368 else if (AllowUnsigned) 1369 Ty = Context.UnsignedIntTy; 1370 Width = IntSize; 1371 } 1372 } 1373 1374 // Are long/unsigned long possibilities? 1375 if (Ty.isNull() && !Literal.isLongLong) { 1376 unsigned LongSize = Context.Target.getLongWidth(); 1377 1378 // Does it fit in a unsigned long? 1379 if (ResultVal.isIntN(LongSize)) { 1380 // Does it fit in a signed long? 1381 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1382 Ty = Context.LongTy; 1383 else if (AllowUnsigned) 1384 Ty = Context.UnsignedLongTy; 1385 Width = LongSize; 1386 } 1387 } 1388 1389 // Finally, check long long if needed. 1390 if (Ty.isNull()) { 1391 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1392 1393 // Does it fit in a unsigned long long? 1394 if (ResultVal.isIntN(LongLongSize)) { 1395 // Does it fit in a signed long long? 1396 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1397 Ty = Context.LongLongTy; 1398 else if (AllowUnsigned) 1399 Ty = Context.UnsignedLongLongTy; 1400 Width = LongLongSize; 1401 } 1402 } 1403 1404 // If we still couldn't decide a type, we probably have something that 1405 // does not fit in a signed long long, but has no U suffix. 1406 if (Ty.isNull()) { 1407 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1408 Ty = Context.UnsignedLongLongTy; 1409 Width = Context.Target.getLongLongWidth(); 1410 } 1411 1412 if (ResultVal.getBitWidth() != Width) 1413 ResultVal.trunc(Width); 1414 } 1415 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1416 } 1417 1418 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1419 if (Literal.isImaginary) 1420 Res = new (Context) ImaginaryLiteral(Res, 1421 Context.getComplexType(Res->getType())); 1422 1423 return Owned(Res); 1424} 1425 1426Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1427 SourceLocation R, ExprArg Val) { 1428 Expr *E = Val.takeAs<Expr>(); 1429 assert((E != 0) && "ActOnParenExpr() missing expr"); 1430 return Owned(new (Context) ParenExpr(L, R, E)); 1431} 1432 1433/// The UsualUnaryConversions() function is *not* called by this routine. 1434/// See C99 6.3.2.1p[2-4] for more details. 1435bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1436 SourceLocation OpLoc, 1437 const SourceRange &ExprRange, 1438 bool isSizeof) { 1439 if (exprType->isDependentType()) 1440 return false; 1441 1442 // C99 6.5.3.4p1: 1443 if (isa<FunctionType>(exprType)) { 1444 // alignof(function) is allowed as an extension. 1445 if (isSizeof) 1446 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1447 return false; 1448 } 1449 1450 // Allow sizeof(void)/alignof(void) as an extension. 1451 if (exprType->isVoidType()) { 1452 Diag(OpLoc, diag::ext_sizeof_void_type) 1453 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1454 return false; 1455 } 1456 1457 if (RequireCompleteType(OpLoc, exprType, 1458 isSizeof ? diag::err_sizeof_incomplete_type : 1459 diag::err_alignof_incomplete_type, 1460 ExprRange)) 1461 return true; 1462 1463 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1464 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1465 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1466 << exprType << isSizeof << ExprRange; 1467 return true; 1468 } 1469 1470 return false; 1471} 1472 1473bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1474 const SourceRange &ExprRange) { 1475 E = E->IgnoreParens(); 1476 1477 // alignof decl is always ok. 1478 if (isa<DeclRefExpr>(E)) 1479 return false; 1480 1481 // Cannot know anything else if the expression is dependent. 1482 if (E->isTypeDependent()) 1483 return false; 1484 1485 if (E->getBitField()) { 1486 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1487 return true; 1488 } 1489 1490 // Alignment of a field access is always okay, so long as it isn't a 1491 // bit-field. 1492 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1493 if (dyn_cast<FieldDecl>(ME->getMemberDecl())) 1494 return false; 1495 1496 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1497} 1498 1499/// \brief Build a sizeof or alignof expression given a type operand. 1500Action::OwningExprResult 1501Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1502 bool isSizeOf, SourceRange R) { 1503 if (T.isNull()) 1504 return ExprError(); 1505 1506 if (!T->isDependentType() && 1507 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1508 return ExprError(); 1509 1510 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1511 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1512 Context.getSizeType(), OpLoc, 1513 R.getEnd())); 1514} 1515 1516/// \brief Build a sizeof or alignof expression given an expression 1517/// operand. 1518Action::OwningExprResult 1519Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1520 bool isSizeOf, SourceRange R) { 1521 // Verify that the operand is valid. 1522 bool isInvalid = false; 1523 if (E->isTypeDependent()) { 1524 // Delay type-checking for type-dependent expressions. 1525 } else if (!isSizeOf) { 1526 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1527 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1528 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1529 isInvalid = true; 1530 } else { 1531 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1532 } 1533 1534 if (isInvalid) 1535 return ExprError(); 1536 1537 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1538 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1539 Context.getSizeType(), OpLoc, 1540 R.getEnd())); 1541} 1542 1543/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1544/// the same for @c alignof and @c __alignof 1545/// Note that the ArgRange is invalid if isType is false. 1546Action::OwningExprResult 1547Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1548 void *TyOrEx, const SourceRange &ArgRange) { 1549 // If error parsing type, ignore. 1550 if (TyOrEx == 0) return ExprError(); 1551 1552 if (isType) { 1553 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1554 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1555 } 1556 1557 // Get the end location. 1558 Expr *ArgEx = (Expr *)TyOrEx; 1559 Action::OwningExprResult Result 1560 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1561 1562 if (Result.isInvalid()) 1563 DeleteExpr(ArgEx); 1564 1565 return move(Result); 1566} 1567 1568QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1569 if (V->isTypeDependent()) 1570 return Context.DependentTy; 1571 1572 // These operators return the element type of a complex type. 1573 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1574 return CT->getElementType(); 1575 1576 // Otherwise they pass through real integer and floating point types here. 1577 if (V->getType()->isArithmeticType()) 1578 return V->getType(); 1579 1580 // Reject anything else. 1581 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1582 << (isReal ? "__real" : "__imag"); 1583 return QualType(); 1584} 1585 1586 1587 1588Action::OwningExprResult 1589Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1590 tok::TokenKind Kind, ExprArg Input) { 1591 Expr *Arg = (Expr *)Input.get(); 1592 1593 UnaryOperator::Opcode Opc; 1594 switch (Kind) { 1595 default: assert(0 && "Unknown unary op!"); 1596 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1597 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1598 } 1599 1600 if (getLangOptions().CPlusPlus && 1601 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1602 // Which overloaded operator? 1603 OverloadedOperatorKind OverOp = 1604 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1605 1606 // C++ [over.inc]p1: 1607 // 1608 // [...] If the function is a member function with one 1609 // parameter (which shall be of type int) or a non-member 1610 // function with two parameters (the second of which shall be 1611 // of type int), it defines the postfix increment operator ++ 1612 // for objects of that type. When the postfix increment is 1613 // called as a result of using the ++ operator, the int 1614 // argument will have value zero. 1615 Expr *Args[2] = { 1616 Arg, 1617 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1618 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1619 }; 1620 1621 // Build the candidate set for overloading 1622 OverloadCandidateSet CandidateSet; 1623 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1624 1625 // Perform overload resolution. 1626 OverloadCandidateSet::iterator Best; 1627 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1628 case OR_Success: { 1629 // We found a built-in operator or an overloaded operator. 1630 FunctionDecl *FnDecl = Best->Function; 1631 1632 if (FnDecl) { 1633 // We matched an overloaded operator. Build a call to that 1634 // operator. 1635 1636 // Convert the arguments. 1637 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1638 if (PerformObjectArgumentInitialization(Arg, Method)) 1639 return ExprError(); 1640 } else { 1641 // Convert the arguments. 1642 if (PerformCopyInitialization(Arg, 1643 FnDecl->getParamDecl(0)->getType(), 1644 "passing")) 1645 return ExprError(); 1646 } 1647 1648 // Determine the result type 1649 QualType ResultTy 1650 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1651 ResultTy = ResultTy.getNonReferenceType(); 1652 1653 // Build the actual expression node. 1654 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1655 SourceLocation()); 1656 UsualUnaryConversions(FnExpr); 1657 1658 Input.release(); 1659 Args[0] = Arg; 1660 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1661 Args, 2, ResultTy, 1662 OpLoc)); 1663 } else { 1664 // We matched a built-in operator. Convert the arguments, then 1665 // break out so that we will build the appropriate built-in 1666 // operator node. 1667 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1668 "passing")) 1669 return ExprError(); 1670 1671 break; 1672 } 1673 } 1674 1675 case OR_No_Viable_Function: 1676 // No viable function; fall through to handling this as a 1677 // built-in operator, which will produce an error message for us. 1678 break; 1679 1680 case OR_Ambiguous: 1681 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1682 << UnaryOperator::getOpcodeStr(Opc) 1683 << Arg->getSourceRange(); 1684 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1685 return ExprError(); 1686 1687 case OR_Deleted: 1688 Diag(OpLoc, diag::err_ovl_deleted_oper) 1689 << Best->Function->isDeleted() 1690 << UnaryOperator::getOpcodeStr(Opc) 1691 << Arg->getSourceRange(); 1692 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1693 return ExprError(); 1694 } 1695 1696 // Either we found no viable overloaded operator or we matched a 1697 // built-in operator. In either case, fall through to trying to 1698 // build a built-in operation. 1699 } 1700 1701 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1702 Opc == UnaryOperator::PostInc); 1703 if (result.isNull()) 1704 return ExprError(); 1705 Input.release(); 1706 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1707} 1708 1709Action::OwningExprResult 1710Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1711 ExprArg Idx, SourceLocation RLoc) { 1712 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1713 *RHSExp = static_cast<Expr*>(Idx.get()); 1714 1715 if (getLangOptions().CPlusPlus && 1716 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1717 Base.release(); 1718 Idx.release(); 1719 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1720 Context.DependentTy, RLoc)); 1721 } 1722 1723 if (getLangOptions().CPlusPlus && 1724 (LHSExp->getType()->isRecordType() || 1725 LHSExp->getType()->isEnumeralType() || 1726 RHSExp->getType()->isRecordType() || 1727 RHSExp->getType()->isEnumeralType())) { 1728 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1729 // to the candidate set. 1730 OverloadCandidateSet CandidateSet; 1731 Expr *Args[2] = { LHSExp, RHSExp }; 1732 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1733 SourceRange(LLoc, RLoc)); 1734 1735 // Perform overload resolution. 1736 OverloadCandidateSet::iterator Best; 1737 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1738 case OR_Success: { 1739 // We found a built-in operator or an overloaded operator. 1740 FunctionDecl *FnDecl = Best->Function; 1741 1742 if (FnDecl) { 1743 // We matched an overloaded operator. Build a call to that 1744 // operator. 1745 1746 // Convert the arguments. 1747 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1748 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1749 PerformCopyInitialization(RHSExp, 1750 FnDecl->getParamDecl(0)->getType(), 1751 "passing")) 1752 return ExprError(); 1753 } else { 1754 // Convert the arguments. 1755 if (PerformCopyInitialization(LHSExp, 1756 FnDecl->getParamDecl(0)->getType(), 1757 "passing") || 1758 PerformCopyInitialization(RHSExp, 1759 FnDecl->getParamDecl(1)->getType(), 1760 "passing")) 1761 return ExprError(); 1762 } 1763 1764 // Determine the result type 1765 QualType ResultTy 1766 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1767 ResultTy = ResultTy.getNonReferenceType(); 1768 1769 // Build the actual expression node. 1770 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1771 SourceLocation()); 1772 UsualUnaryConversions(FnExpr); 1773 1774 Base.release(); 1775 Idx.release(); 1776 Args[0] = LHSExp; 1777 Args[1] = RHSExp; 1778 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1779 FnExpr, Args, 2, 1780 ResultTy, LLoc)); 1781 } else { 1782 // We matched a built-in operator. Convert the arguments, then 1783 // break out so that we will build the appropriate built-in 1784 // operator node. 1785 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1786 "passing") || 1787 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1788 "passing")) 1789 return ExprError(); 1790 1791 break; 1792 } 1793 } 1794 1795 case OR_No_Viable_Function: 1796 // No viable function; fall through to handling this as a 1797 // built-in operator, which will produce an error message for us. 1798 break; 1799 1800 case OR_Ambiguous: 1801 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1802 << "[]" 1803 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1804 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1805 return ExprError(); 1806 1807 case OR_Deleted: 1808 Diag(LLoc, diag::err_ovl_deleted_oper) 1809 << Best->Function->isDeleted() 1810 << "[]" 1811 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1812 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1813 return ExprError(); 1814 } 1815 1816 // Either we found no viable overloaded operator or we matched a 1817 // built-in operator. In either case, fall through to trying to 1818 // build a built-in operation. 1819 } 1820 1821 // Perform default conversions. 1822 DefaultFunctionArrayConversion(LHSExp); 1823 DefaultFunctionArrayConversion(RHSExp); 1824 1825 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1826 1827 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1828 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1829 // in the subscript position. As a result, we need to derive the array base 1830 // and index from the expression types. 1831 Expr *BaseExpr, *IndexExpr; 1832 QualType ResultType; 1833 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1834 BaseExpr = LHSExp; 1835 IndexExpr = RHSExp; 1836 ResultType = Context.DependentTy; 1837 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1838 BaseExpr = LHSExp; 1839 IndexExpr = RHSExp; 1840 ResultType = PTy->getPointeeType(); 1841 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1842 // Handle the uncommon case of "123[Ptr]". 1843 BaseExpr = RHSExp; 1844 IndexExpr = LHSExp; 1845 ResultType = PTy->getPointeeType(); 1846 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1847 BaseExpr = LHSExp; // vectors: V[123] 1848 IndexExpr = RHSExp; 1849 1850 // FIXME: need to deal with const... 1851 ResultType = VTy->getElementType(); 1852 } else if (LHSTy->isArrayType()) { 1853 // If we see an array that wasn't promoted by 1854 // DefaultFunctionArrayConversion, it must be an array that 1855 // wasn't promoted because of the C90 rule that doesn't 1856 // allow promoting non-lvalue arrays. Warn, then 1857 // force the promotion here. 1858 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1859 LHSExp->getSourceRange(); 1860 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1861 LHSTy = LHSExp->getType(); 1862 1863 BaseExpr = LHSExp; 1864 IndexExpr = RHSExp; 1865 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1866 } else if (RHSTy->isArrayType()) { 1867 // Same as previous, except for 123[f().a] case 1868 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1869 RHSExp->getSourceRange(); 1870 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1871 RHSTy = RHSExp->getType(); 1872 1873 BaseExpr = RHSExp; 1874 IndexExpr = LHSExp; 1875 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1876 } else { 1877 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1878 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1879 } 1880 // C99 6.5.2.1p1 1881 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1882 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1883 << IndexExpr->getSourceRange()); 1884 1885 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1886 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1887 // type. Note that Functions are not objects, and that (in C99 parlance) 1888 // incomplete types are not object types. 1889 if (ResultType->isFunctionType()) { 1890 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1891 << ResultType << BaseExpr->getSourceRange(); 1892 return ExprError(); 1893 } 1894 1895 if (!ResultType->isDependentType() && 1896 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1897 BaseExpr->getSourceRange())) 1898 return ExprError(); 1899 1900 // Diagnose bad cases where we step over interface counts. 1901 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1902 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1903 << ResultType << BaseExpr->getSourceRange(); 1904 return ExprError(); 1905 } 1906 1907 Base.release(); 1908 Idx.release(); 1909 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1910 ResultType, RLoc)); 1911} 1912 1913QualType Sema:: 1914CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1915 IdentifierInfo &CompName, SourceLocation CompLoc) { 1916 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1917 1918 // The vector accessor can't exceed the number of elements. 1919 const char *compStr = CompName.getName(); 1920 1921 // This flag determines whether or not the component is one of the four 1922 // special names that indicate a subset of exactly half the elements are 1923 // to be selected. 1924 bool HalvingSwizzle = false; 1925 1926 // This flag determines whether or not CompName has an 's' char prefix, 1927 // indicating that it is a string of hex values to be used as vector indices. 1928 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1929 1930 // Check that we've found one of the special components, or that the component 1931 // names must come from the same set. 1932 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1933 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1934 HalvingSwizzle = true; 1935 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1936 do 1937 compStr++; 1938 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1939 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1940 do 1941 compStr++; 1942 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1943 } 1944 1945 if (!HalvingSwizzle && *compStr) { 1946 // We didn't get to the end of the string. This means the component names 1947 // didn't come from the same set *or* we encountered an illegal name. 1948 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1949 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1950 return QualType(); 1951 } 1952 1953 // Ensure no component accessor exceeds the width of the vector type it 1954 // operates on. 1955 if (!HalvingSwizzle) { 1956 compStr = CompName.getName(); 1957 1958 if (HexSwizzle) 1959 compStr++; 1960 1961 while (*compStr) { 1962 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1963 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1964 << baseType << SourceRange(CompLoc); 1965 return QualType(); 1966 } 1967 } 1968 } 1969 1970 // If this is a halving swizzle, verify that the base type has an even 1971 // number of elements. 1972 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1973 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1974 << baseType << SourceRange(CompLoc); 1975 return QualType(); 1976 } 1977 1978 // The component accessor looks fine - now we need to compute the actual type. 1979 // The vector type is implied by the component accessor. For example, 1980 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1981 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1982 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1983 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1984 : CompName.getLength(); 1985 if (HexSwizzle) 1986 CompSize--; 1987 1988 if (CompSize == 1) 1989 return vecType->getElementType(); 1990 1991 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1992 // Now look up the TypeDefDecl from the vector type. Without this, 1993 // diagostics look bad. We want extended vector types to appear built-in. 1994 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1995 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1996 return Context.getTypedefType(ExtVectorDecls[i]); 1997 } 1998 return VT; // should never get here (a typedef type should always be found). 1999} 2000 2001static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 2002 IdentifierInfo &Member, 2003 const Selector &Sel, 2004 ASTContext &Context) { 2005 2006 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 2007 return PD; 2008 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 2009 return OMD; 2010 2011 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 2012 E = PDecl->protocol_end(); I != E; ++I) { 2013 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 2014 Context)) 2015 return D; 2016 } 2017 return 0; 2018} 2019 2020static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 2021 IdentifierInfo &Member, 2022 const Selector &Sel, 2023 ASTContext &Context) { 2024 // Check protocols on qualified interfaces. 2025 Decl *GDecl = 0; 2026 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2027 E = QIdTy->qual_end(); I != E; ++I) { 2028 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 2029 GDecl = PD; 2030 break; 2031 } 2032 // Also must look for a getter name which uses property syntax. 2033 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 2034 GDecl = OMD; 2035 break; 2036 } 2037 } 2038 if (!GDecl) { 2039 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2040 E = QIdTy->qual_end(); I != E; ++I) { 2041 // Search in the protocol-qualifier list of current protocol. 2042 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2043 if (GDecl) 2044 return GDecl; 2045 } 2046 } 2047 return GDecl; 2048} 2049 2050/// FindMethodInNestedImplementations - Look up a method in current and 2051/// all base class implementations. 2052/// 2053ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2054 const ObjCInterfaceDecl *IFace, 2055 const Selector &Sel) { 2056 ObjCMethodDecl *Method = 0; 2057 if (ObjCImplementationDecl *ImpDecl 2058 = LookupObjCImplementation(IFace->getIdentifier())) 2059 Method = ImpDecl->getInstanceMethod(Sel); 2060 2061 if (!Method && IFace->getSuperClass()) 2062 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2063 return Method; 2064} 2065 2066Action::OwningExprResult 2067Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2068 tok::TokenKind OpKind, SourceLocation MemberLoc, 2069 IdentifierInfo &Member, 2070 DeclPtrTy ObjCImpDecl) { 2071 Expr *BaseExpr = Base.takeAs<Expr>(); 2072 assert(BaseExpr && "no record expression"); 2073 2074 // Perform default conversions. 2075 DefaultFunctionArrayConversion(BaseExpr); 2076 2077 QualType BaseType = BaseExpr->getType(); 2078 assert(!BaseType.isNull() && "no type for member expression"); 2079 2080 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2081 // must have pointer type, and the accessed type is the pointee. 2082 if (OpKind == tok::arrow) { 2083 if (BaseType->isDependentType()) 2084 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2085 BaseExpr, true, 2086 OpLoc, 2087 DeclarationName(&Member), 2088 MemberLoc)); 2089 else if (const PointerType *PT = BaseType->getAsPointerType()) 2090 BaseType = PT->getPointeeType(); 2091 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2092 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2093 MemberLoc, Member)); 2094 else 2095 return ExprError(Diag(MemberLoc, 2096 diag::err_typecheck_member_reference_arrow) 2097 << BaseType << BaseExpr->getSourceRange()); 2098 } else { 2099 if (BaseType->isDependentType()) { 2100 // Require that the base type isn't a pointer type 2101 // (so we'll report an error for) 2102 // T* t; 2103 // t.f; 2104 // 2105 // In Obj-C++, however, the above expression is valid, since it could be 2106 // accessing the 'f' property if T is an Obj-C interface. The extra check 2107 // allows this, while still reporting an error if T is a struct pointer. 2108 const PointerType *PT = BaseType->getAsPointerType(); 2109 2110 if (!PT || (getLangOptions().ObjC1 && 2111 !PT->getPointeeType()->isRecordType())) 2112 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2113 BaseExpr, false, 2114 OpLoc, 2115 DeclarationName(&Member), 2116 MemberLoc)); 2117 } 2118 } 2119 2120 // Handle field access to simple records. This also handles access to fields 2121 // of the ObjC 'id' struct. 2122 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2123 RecordDecl *RDecl = RTy->getDecl(); 2124 if (RequireCompleteType(OpLoc, BaseType, 2125 diag::err_typecheck_incomplete_tag, 2126 BaseExpr->getSourceRange())) 2127 return ExprError(); 2128 2129 // The record definition is complete, now make sure the member is valid. 2130 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2131 LookupResult Result 2132 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2133 LookupMemberName, false); 2134 2135 if (!Result) 2136 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2137 << &Member << BaseExpr->getSourceRange()); 2138 if (Result.isAmbiguous()) { 2139 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2140 MemberLoc, BaseExpr->getSourceRange()); 2141 return ExprError(); 2142 } 2143 2144 NamedDecl *MemberDecl = Result; 2145 2146 // If the decl being referenced had an error, return an error for this 2147 // sub-expr without emitting another error, in order to avoid cascading 2148 // error cases. 2149 if (MemberDecl->isInvalidDecl()) 2150 return ExprError(); 2151 2152 // Check the use of this field 2153 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2154 return ExprError(); 2155 2156 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2157 // We may have found a field within an anonymous union or struct 2158 // (C++ [class.union]). 2159 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2160 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2161 BaseExpr, OpLoc); 2162 2163 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2164 // FIXME: Handle address space modifiers 2165 QualType MemberType = FD->getType(); 2166 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2167 MemberType = Ref->getPointeeType(); 2168 else { 2169 unsigned combinedQualifiers = 2170 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2171 if (FD->isMutable()) 2172 combinedQualifiers &= ~QualType::Const; 2173 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2174 } 2175 2176 MarkDeclarationReferenced(MemberLoc, FD); 2177 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2178 MemberLoc, MemberType)); 2179 } 2180 2181 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2182 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2183 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2184 Var, MemberLoc, 2185 Var->getType().getNonReferenceType())); 2186 } 2187 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2188 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2189 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2190 MemberFn, MemberLoc, 2191 MemberFn->getType())); 2192 } 2193 if (OverloadedFunctionDecl *Ovl 2194 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2195 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2196 MemberLoc, Context.OverloadTy)); 2197 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2198 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2199 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2200 Enum, MemberLoc, Enum->getType())); 2201 } 2202 if (isa<TypeDecl>(MemberDecl)) 2203 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2204 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2205 2206 // We found a declaration kind that we didn't expect. This is a 2207 // generic error message that tells the user that she can't refer 2208 // to this member with '.' or '->'. 2209 return ExprError(Diag(MemberLoc, 2210 diag::err_typecheck_member_reference_unknown) 2211 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2212 } 2213 2214 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2215 // (*Obj).ivar. 2216 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 2217 ObjCInterfaceDecl *ClassDeclared; 2218 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 2219 ClassDeclared)) { 2220 // If the decl being referenced had an error, return an error for this 2221 // sub-expr without emitting another error, in order to avoid cascading 2222 // error cases. 2223 if (IV->isInvalidDecl()) 2224 return ExprError(); 2225 2226 // Check whether we can reference this field. 2227 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2228 return ExprError(); 2229 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2230 IV->getAccessControl() != ObjCIvarDecl::Package) { 2231 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2232 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2233 ClassOfMethodDecl = MD->getClassInterface(); 2234 else if (ObjCImpDecl && getCurFunctionDecl()) { 2235 // Case of a c-function declared inside an objc implementation. 2236 // FIXME: For a c-style function nested inside an objc implementation 2237 // class, there is no implementation context available, so we pass 2238 // down the context as argument to this routine. Ideally, this context 2239 // need be passed down in the AST node and somehow calculated from the 2240 // AST for a function decl. 2241 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2242 if (ObjCImplementationDecl *IMPD = 2243 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2244 ClassOfMethodDecl = IMPD->getClassInterface(); 2245 else if (ObjCCategoryImplDecl* CatImplClass = 2246 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2247 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2248 } 2249 2250 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2251 if (ClassDeclared != IFTy->getDecl() || 2252 ClassOfMethodDecl != ClassDeclared) 2253 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 2254 } 2255 // @protected 2256 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 2257 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 2258 } 2259 2260 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2261 MemberLoc, BaseExpr, 2262 OpKind == tok::arrow)); 2263 } 2264 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2265 << IFTy->getDecl()->getDeclName() << &Member 2266 << BaseExpr->getSourceRange()); 2267 } 2268 2269 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2270 // pointer to a (potentially qualified) interface type. 2271 const PointerType *PTy; 2272 const ObjCInterfaceType *IFTy; 2273 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2274 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2275 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2276 2277 // Search for a declared property first. 2278 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 2279 // Check whether we can reference this property. 2280 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2281 return ExprError(); 2282 QualType ResTy = PD->getType(); 2283 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2284 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2285 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2286 ResTy = Getter->getResultType(); 2287 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2288 MemberLoc, BaseExpr)); 2289 } 2290 2291 // Check protocols on qualified interfaces. 2292 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2293 E = IFTy->qual_end(); I != E; ++I) 2294 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 2295 // Check whether we can reference this property. 2296 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2297 return ExprError(); 2298 2299 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2300 MemberLoc, BaseExpr)); 2301 } 2302 2303 // If that failed, look for an "implicit" property by seeing if the nullary 2304 // selector is implemented. 2305 2306 // FIXME: The logic for looking up nullary and unary selectors should be 2307 // shared with the code in ActOnInstanceMessage. 2308 2309 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2310 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2311 2312 // If this reference is in an @implementation, check for 'private' methods. 2313 if (!Getter) 2314 Getter = FindMethodInNestedImplementations(IFace, Sel); 2315 2316 // Look through local category implementations associated with the class. 2317 if (!Getter) { 2318 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2319 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2320 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 2321 } 2322 } 2323 if (Getter) { 2324 // Check if we can reference this property. 2325 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2326 return ExprError(); 2327 } 2328 // If we found a getter then this may be a valid dot-reference, we 2329 // will look for the matching setter, in case it is needed. 2330 Selector SetterSel = 2331 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2332 PP.getSelectorTable(), &Member); 2333 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2334 if (!Setter) { 2335 // If this reference is in an @implementation, also check for 'private' 2336 // methods. 2337 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2338 } 2339 // Look through local category implementations associated with the class. 2340 if (!Setter) { 2341 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2342 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2343 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 2344 } 2345 } 2346 2347 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2348 return ExprError(); 2349 2350 if (Getter || Setter) { 2351 QualType PType; 2352 2353 if (Getter) 2354 PType = Getter->getResultType(); 2355 else { 2356 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2357 E = Setter->param_end(); PI != E; ++PI) 2358 PType = (*PI)->getType(); 2359 } 2360 // FIXME: we must check that the setter has property type. 2361 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2362 Setter, MemberLoc, BaseExpr)); 2363 } 2364 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2365 << &Member << BaseType); 2366 } 2367 // Handle properties on qualified "id" protocols. 2368 const ObjCObjectPointerType *QIdTy; 2369 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2370 // Check protocols on qualified interfaces. 2371 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2372 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2373 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2374 // Check the use of this declaration 2375 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2376 return ExprError(); 2377 2378 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2379 MemberLoc, BaseExpr)); 2380 } 2381 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2382 // Check the use of this method. 2383 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2384 return ExprError(); 2385 2386 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2387 OMD->getResultType(), 2388 OMD, OpLoc, MemberLoc, 2389 NULL, 0)); 2390 } 2391 } 2392 2393 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2394 << &Member << BaseType); 2395 } 2396 // Handle properties on ObjC 'Class' types. 2397 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2398 // Also must look for a getter name which uses property syntax. 2399 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2400 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2401 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2402 ObjCMethodDecl *Getter; 2403 // FIXME: need to also look locally in the implementation. 2404 if ((Getter = IFace->lookupClassMethod(Sel))) { 2405 // Check the use of this method. 2406 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2407 return ExprError(); 2408 } 2409 // If we found a getter then this may be a valid dot-reference, we 2410 // will look for the matching setter, in case it is needed. 2411 Selector SetterSel = 2412 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2413 PP.getSelectorTable(), &Member); 2414 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2415 if (!Setter) { 2416 // If this reference is in an @implementation, also check for 'private' 2417 // methods. 2418 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2419 } 2420 // Look through local category implementations associated with the class. 2421 if (!Setter) { 2422 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2423 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2424 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel); 2425 } 2426 } 2427 2428 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2429 return ExprError(); 2430 2431 if (Getter || Setter) { 2432 QualType PType; 2433 2434 if (Getter) 2435 PType = Getter->getResultType(); 2436 else { 2437 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2438 E = Setter->param_end(); PI != E; ++PI) 2439 PType = (*PI)->getType(); 2440 } 2441 // FIXME: we must check that the setter has property type. 2442 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2443 Setter, MemberLoc, BaseExpr)); 2444 } 2445 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2446 << &Member << BaseType); 2447 } 2448 } 2449 2450 // Handle 'field access' to vectors, such as 'V.xx'. 2451 if (BaseType->isExtVectorType()) { 2452 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2453 if (ret.isNull()) 2454 return ExprError(); 2455 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2456 MemberLoc)); 2457 } 2458 2459 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2460 << BaseType << BaseExpr->getSourceRange(); 2461 2462 // If the user is trying to apply -> or . to a function or function 2463 // pointer, it's probably because they forgot parentheses to call 2464 // the function. Suggest the addition of those parentheses. 2465 if (BaseType == Context.OverloadTy || 2466 BaseType->isFunctionType() || 2467 (BaseType->isPointerType() && 2468 BaseType->getAsPointerType()->isFunctionType())) { 2469 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2470 Diag(Loc, diag::note_member_reference_needs_call) 2471 << CodeModificationHint::CreateInsertion(Loc, "()"); 2472 } 2473 2474 return ExprError(); 2475} 2476 2477/// ConvertArgumentsForCall - Converts the arguments specified in 2478/// Args/NumArgs to the parameter types of the function FDecl with 2479/// function prototype Proto. Call is the call expression itself, and 2480/// Fn is the function expression. For a C++ member function, this 2481/// routine does not attempt to convert the object argument. Returns 2482/// true if the call is ill-formed. 2483bool 2484Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2485 FunctionDecl *FDecl, 2486 const FunctionProtoType *Proto, 2487 Expr **Args, unsigned NumArgs, 2488 SourceLocation RParenLoc) { 2489 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2490 // assignment, to the types of the corresponding parameter, ... 2491 unsigned NumArgsInProto = Proto->getNumArgs(); 2492 unsigned NumArgsToCheck = NumArgs; 2493 bool Invalid = false; 2494 2495 // If too few arguments are available (and we don't have default 2496 // arguments for the remaining parameters), don't make the call. 2497 if (NumArgs < NumArgsInProto) { 2498 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2499 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2500 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2501 // Use default arguments for missing arguments 2502 NumArgsToCheck = NumArgsInProto; 2503 Call->setNumArgs(Context, NumArgsInProto); 2504 } 2505 2506 // If too many are passed and not variadic, error on the extras and drop 2507 // them. 2508 if (NumArgs > NumArgsInProto) { 2509 if (!Proto->isVariadic()) { 2510 Diag(Args[NumArgsInProto]->getLocStart(), 2511 diag::err_typecheck_call_too_many_args) 2512 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2513 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2514 Args[NumArgs-1]->getLocEnd()); 2515 // This deletes the extra arguments. 2516 Call->setNumArgs(Context, NumArgsInProto); 2517 Invalid = true; 2518 } 2519 NumArgsToCheck = NumArgsInProto; 2520 } 2521 2522 // Continue to check argument types (even if we have too few/many args). 2523 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2524 QualType ProtoArgType = Proto->getArgType(i); 2525 2526 Expr *Arg; 2527 if (i < NumArgs) { 2528 Arg = Args[i]; 2529 2530 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2531 ProtoArgType, 2532 diag::err_call_incomplete_argument, 2533 Arg->getSourceRange())) 2534 return true; 2535 2536 // Pass the argument. 2537 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2538 return true; 2539 } else { 2540 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2541 Diag (Call->getSourceRange().getBegin(), 2542 diag::err_use_of_default_argument_to_function_declared_later) << 2543 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2544 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2545 diag::note_default_argument_declared_here); 2546 } else { 2547 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2548 2549 // If the default expression creates temporaries, we need to 2550 // push them to the current stack of expression temporaries so they'll 2551 // be properly destroyed. 2552 if (CXXExprWithTemporaries *E 2553 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2554 assert(!E->shouldDestroyTemporaries() && 2555 "Can't destroy temporaries in a default argument expr!"); 2556 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2557 ExprTemporaries.push_back(E->getTemporary(I)); 2558 } 2559 } 2560 2561 // We already type-checked the argument, so we know it works. 2562 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2563 } 2564 2565 QualType ArgType = Arg->getType(); 2566 2567 Call->setArg(i, Arg); 2568 } 2569 2570 // If this is a variadic call, handle args passed through "...". 2571 if (Proto->isVariadic()) { 2572 VariadicCallType CallType = VariadicFunction; 2573 if (Fn->getType()->isBlockPointerType()) 2574 CallType = VariadicBlock; // Block 2575 else if (isa<MemberExpr>(Fn)) 2576 CallType = VariadicMethod; 2577 2578 // Promote the arguments (C99 6.5.2.2p7). 2579 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2580 Expr *Arg = Args[i]; 2581 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2582 Call->setArg(i, Arg); 2583 } 2584 } 2585 2586 return Invalid; 2587} 2588 2589/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2590/// This provides the location of the left/right parens and a list of comma 2591/// locations. 2592Action::OwningExprResult 2593Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2594 MultiExprArg args, 2595 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2596 unsigned NumArgs = args.size(); 2597 Expr *Fn = fn.takeAs<Expr>(); 2598 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2599 assert(Fn && "no function call expression"); 2600 FunctionDecl *FDecl = NULL; 2601 NamedDecl *NDecl = NULL; 2602 DeclarationName UnqualifiedName; 2603 2604 if (getLangOptions().CPlusPlus) { 2605 // Determine whether this is a dependent call inside a C++ template, 2606 // in which case we won't do any semantic analysis now. 2607 // FIXME: Will need to cache the results of name lookup (including ADL) in 2608 // Fn. 2609 bool Dependent = false; 2610 if (Fn->isTypeDependent()) 2611 Dependent = true; 2612 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2613 Dependent = true; 2614 2615 if (Dependent) 2616 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2617 Context.DependentTy, RParenLoc)); 2618 2619 // Determine whether this is a call to an object (C++ [over.call.object]). 2620 if (Fn->getType()->isRecordType()) 2621 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2622 CommaLocs, RParenLoc)); 2623 2624 // Determine whether this is a call to a member function. 2625 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2626 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2627 if (isa<OverloadedFunctionDecl>(MemDecl) || 2628 isa<CXXMethodDecl>(MemDecl) || 2629 (isa<FunctionTemplateDecl>(MemDecl) && 2630 isa<CXXMethodDecl>( 2631 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2632 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2633 CommaLocs, RParenLoc)); 2634 } 2635 } 2636 2637 // If we're directly calling a function, get the appropriate declaration. 2638 Expr *FnExpr = Fn; 2639 bool ADL = true; 2640 while (true) { 2641 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2642 FnExpr = IcExpr->getSubExpr(); 2643 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2644 // Parentheses around a function disable ADL 2645 // (C++0x [basic.lookup.argdep]p1). 2646 ADL = false; 2647 FnExpr = PExpr->getSubExpr(); 2648 } else if (isa<UnaryOperator>(FnExpr) && 2649 cast<UnaryOperator>(FnExpr)->getOpcode() 2650 == UnaryOperator::AddrOf) { 2651 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2652 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2653 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2654 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2655 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2656 break; 2657 } else if (UnresolvedFunctionNameExpr *DepName 2658 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2659 UnqualifiedName = DepName->getName(); 2660 break; 2661 } else if (TemplateIdRefExpr *TemplateIdRef 2662 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2663 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2664 break; 2665 } else { 2666 // Any kind of name that does not refer to a declaration (or 2667 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2668 ADL = false; 2669 break; 2670 } 2671 } 2672 2673 OverloadedFunctionDecl *Ovl = 0; 2674 FunctionTemplateDecl *FunctionTemplate = 0; 2675 if (NDecl) { 2676 FDecl = dyn_cast<FunctionDecl>(NDecl); 2677 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2678 FDecl = FunctionTemplate->getTemplatedDecl(); 2679 else 2680 FDecl = dyn_cast<FunctionDecl>(NDecl); 2681 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2682 } 2683 2684 if (Ovl || FunctionTemplate || 2685 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2686 // We don't perform ADL for implicit declarations of builtins. 2687 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2688 ADL = false; 2689 2690 // We don't perform ADL in C. 2691 if (!getLangOptions().CPlusPlus) 2692 ADL = false; 2693 2694 if (Ovl || FunctionTemplate || ADL) { 2695 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, LParenLoc, 2696 Args, NumArgs, CommaLocs, RParenLoc, ADL); 2697 if (!FDecl) 2698 return ExprError(); 2699 2700 // Update Fn to refer to the actual function selected. 2701 Expr *NewFn = 0; 2702 if (QualifiedDeclRefExpr *QDRExpr 2703 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2704 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2705 QDRExpr->getLocation(), 2706 false, false, 2707 QDRExpr->getQualifierRange(), 2708 QDRExpr->getQualifier()); 2709 else 2710 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2711 Fn->getSourceRange().getBegin()); 2712 Fn->Destroy(Context); 2713 Fn = NewFn; 2714 } 2715 } 2716 2717 // Promote the function operand. 2718 UsualUnaryConversions(Fn); 2719 2720 // Make the call expr early, before semantic checks. This guarantees cleanup 2721 // of arguments and function on error. 2722 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2723 Args, NumArgs, 2724 Context.BoolTy, 2725 RParenLoc)); 2726 2727 const FunctionType *FuncT; 2728 if (!Fn->getType()->isBlockPointerType()) { 2729 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2730 // have type pointer to function". 2731 const PointerType *PT = Fn->getType()->getAsPointerType(); 2732 if (PT == 0) 2733 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2734 << Fn->getType() << Fn->getSourceRange()); 2735 FuncT = PT->getPointeeType()->getAsFunctionType(); 2736 } else { // This is a block call. 2737 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2738 getAsFunctionType(); 2739 } 2740 if (FuncT == 0) 2741 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2742 << Fn->getType() << Fn->getSourceRange()); 2743 2744 // Check for a valid return type 2745 if (!FuncT->getResultType()->isVoidType() && 2746 RequireCompleteType(Fn->getSourceRange().getBegin(), 2747 FuncT->getResultType(), 2748 diag::err_call_incomplete_return, 2749 TheCall->getSourceRange())) 2750 return ExprError(); 2751 2752 // We know the result type of the call, set it. 2753 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2754 2755 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2756 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2757 RParenLoc)) 2758 return ExprError(); 2759 } else { 2760 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2761 2762 if (FDecl) { 2763 // Check if we have too few/too many template arguments, based 2764 // on our knowledge of the function definition. 2765 const FunctionDecl *Def = 0; 2766 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2767 const FunctionProtoType *Proto = 2768 Def->getType()->getAsFunctionProtoType(); 2769 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2770 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2771 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2772 } 2773 } 2774 } 2775 2776 // Promote the arguments (C99 6.5.2.2p6). 2777 for (unsigned i = 0; i != NumArgs; i++) { 2778 Expr *Arg = Args[i]; 2779 DefaultArgumentPromotion(Arg); 2780 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2781 Arg->getType(), 2782 diag::err_call_incomplete_argument, 2783 Arg->getSourceRange())) 2784 return ExprError(); 2785 TheCall->setArg(i, Arg); 2786 } 2787 } 2788 2789 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2790 if (!Method->isStatic()) 2791 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2792 << Fn->getSourceRange()); 2793 2794 // Check for sentinels 2795 if (NDecl) 2796 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2797 // Do special checking on direct calls to functions. 2798 if (FDecl) 2799 return CheckFunctionCall(FDecl, TheCall.take()); 2800 if (NDecl) 2801 return CheckBlockCall(NDecl, TheCall.take()); 2802 2803 return Owned(TheCall.take()); 2804} 2805 2806Action::OwningExprResult 2807Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2808 SourceLocation RParenLoc, ExprArg InitExpr) { 2809 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2810 QualType literalType = QualType::getFromOpaquePtr(Ty); 2811 // FIXME: put back this assert when initializers are worked out. 2812 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2813 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2814 2815 if (literalType->isArrayType()) { 2816 if (literalType->isVariableArrayType()) 2817 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2818 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2819 } else if (!literalType->isDependentType() && 2820 RequireCompleteType(LParenLoc, literalType, 2821 diag::err_typecheck_decl_incomplete_type, 2822 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2823 return ExprError(); 2824 2825 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2826 DeclarationName(), /*FIXME:DirectInit=*/false)) 2827 return ExprError(); 2828 2829 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2830 if (isFileScope) { // 6.5.2.5p3 2831 if (CheckForConstantInitializer(literalExpr, literalType)) 2832 return ExprError(); 2833 } 2834 InitExpr.release(); 2835 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2836 literalExpr, isFileScope)); 2837} 2838 2839Action::OwningExprResult 2840Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2841 SourceLocation RBraceLoc) { 2842 unsigned NumInit = initlist.size(); 2843 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2844 2845 // Semantic analysis for initializers is done by ActOnDeclarator() and 2846 // CheckInitializer() - it requires knowledge of the object being intialized. 2847 2848 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2849 RBraceLoc); 2850 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2851 return Owned(E); 2852} 2853 2854/// CheckCastTypes - Check type constraints for casting between types. 2855bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2856 UsualUnaryConversions(castExpr); 2857 2858 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2859 // type needs to be scalar. 2860 if (castType->isVoidType()) { 2861 // Cast to void allows any expr type. 2862 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2863 // We can't check any more until template instantiation time. 2864 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2865 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2866 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2867 (castType->isStructureType() || castType->isUnionType())) { 2868 // GCC struct/union extension: allow cast to self. 2869 // FIXME: Check that the cast destination type is complete. 2870 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2871 << castType << castExpr->getSourceRange(); 2872 } else if (castType->isUnionType()) { 2873 // GCC cast to union extension 2874 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2875 RecordDecl::field_iterator Field, FieldEnd; 2876 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2877 Field != FieldEnd; ++Field) { 2878 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2879 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2880 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2881 << castExpr->getSourceRange(); 2882 break; 2883 } 2884 } 2885 if (Field == FieldEnd) 2886 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2887 << castExpr->getType() << castExpr->getSourceRange(); 2888 } else { 2889 // Reject any other conversions to non-scalar types. 2890 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2891 << castType << castExpr->getSourceRange(); 2892 } 2893 } else if (!castExpr->getType()->isScalarType() && 2894 !castExpr->getType()->isVectorType()) { 2895 return Diag(castExpr->getLocStart(), 2896 diag::err_typecheck_expect_scalar_operand) 2897 << castExpr->getType() << castExpr->getSourceRange(); 2898 } else if (castType->isExtVectorType()) { 2899 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 2900 return true; 2901 } else if (castType->isVectorType()) { 2902 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2903 return true; 2904 } else if (castExpr->getType()->isVectorType()) { 2905 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2906 return true; 2907 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2908 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2909 } else if (!castType->isArithmeticType()) { 2910 QualType castExprType = castExpr->getType(); 2911 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 2912 return Diag(castExpr->getLocStart(), 2913 diag::err_cast_pointer_from_non_pointer_int) 2914 << castExprType << castExpr->getSourceRange(); 2915 } else if (!castExpr->getType()->isArithmeticType()) { 2916 if (!castType->isIntegralType() && castType->isArithmeticType()) 2917 return Diag(castExpr->getLocStart(), 2918 diag::err_cast_pointer_to_non_pointer_int) 2919 << castType << castExpr->getSourceRange(); 2920 } 2921 if (isa<ObjCSelectorExpr>(castExpr)) 2922 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 2923 return false; 2924} 2925 2926bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2927 assert(VectorTy->isVectorType() && "Not a vector type!"); 2928 2929 if (Ty->isVectorType() || Ty->isIntegerType()) { 2930 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2931 return Diag(R.getBegin(), 2932 Ty->isVectorType() ? 2933 diag::err_invalid_conversion_between_vectors : 2934 diag::err_invalid_conversion_between_vector_and_integer) 2935 << VectorTy << Ty << R; 2936 } else 2937 return Diag(R.getBegin(), 2938 diag::err_invalid_conversion_between_vector_and_scalar) 2939 << VectorTy << Ty << R; 2940 2941 return false; 2942} 2943 2944bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 2945 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 2946 2947 // If SrcTy is a VectorType, the total size must match to explicitly cast to 2948 // an ExtVectorType. 2949 if (SrcTy->isVectorType()) { 2950 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 2951 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 2952 << DestTy << SrcTy << R; 2953 return false; 2954 } 2955 2956 // All non-pointer scalars can be cast to ExtVector type. The appropriate 2957 // conversion will take place first from scalar to elt type, and then 2958 // splat from elt type to vector. 2959 if (SrcTy->isPointerType()) 2960 return Diag(R.getBegin(), 2961 diag::err_invalid_conversion_between_vector_and_scalar) 2962 << DestTy << SrcTy << R; 2963 return false; 2964} 2965 2966Action::OwningExprResult 2967Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2968 SourceLocation RParenLoc, ExprArg Op) { 2969 assert((Ty != 0) && (Op.get() != 0) && 2970 "ActOnCastExpr(): missing type or expr"); 2971 2972 Expr *castExpr = Op.takeAs<Expr>(); 2973 QualType castType = QualType::getFromOpaquePtr(Ty); 2974 2975 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2976 return ExprError(); 2977 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2978 LParenLoc, RParenLoc)); 2979} 2980 2981/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2982/// In that case, lhs = cond. 2983/// C99 6.5.15 2984QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2985 SourceLocation QuestionLoc) { 2986 // C++ is sufficiently different to merit its own checker. 2987 if (getLangOptions().CPlusPlus) 2988 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2989 2990 UsualUnaryConversions(Cond); 2991 UsualUnaryConversions(LHS); 2992 UsualUnaryConversions(RHS); 2993 QualType CondTy = Cond->getType(); 2994 QualType LHSTy = LHS->getType(); 2995 QualType RHSTy = RHS->getType(); 2996 2997 // first, check the condition. 2998 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2999 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3000 << CondTy; 3001 return QualType(); 3002 } 3003 3004 // Now check the two expressions. 3005 3006 // If both operands have arithmetic type, do the usual arithmetic conversions 3007 // to find a common type: C99 6.5.15p3,5. 3008 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3009 UsualArithmeticConversions(LHS, RHS); 3010 return LHS->getType(); 3011 } 3012 3013 // If both operands are the same structure or union type, the result is that 3014 // type. 3015 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 3016 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 3017 if (LHSRT->getDecl() == RHSRT->getDecl()) 3018 // "If both the operands have structure or union type, the result has 3019 // that type." This implies that CV qualifiers are dropped. 3020 return LHSTy.getUnqualifiedType(); 3021 // FIXME: Type of conditional expression must be complete in C mode. 3022 } 3023 3024 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3025 // The following || allows only one side to be void (a GCC-ism). 3026 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3027 if (!LHSTy->isVoidType()) 3028 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3029 << RHS->getSourceRange(); 3030 if (!RHSTy->isVoidType()) 3031 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3032 << LHS->getSourceRange(); 3033 ImpCastExprToType(LHS, Context.VoidTy); 3034 ImpCastExprToType(RHS, Context.VoidTy); 3035 return Context.VoidTy; 3036 } 3037 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3038 // the type of the other operand." 3039 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 3040 Context.isObjCObjectPointerType(LHSTy)) && 3041 RHS->isNullPointerConstant(Context)) { 3042 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3043 return LHSTy; 3044 } 3045 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 3046 Context.isObjCObjectPointerType(RHSTy)) && 3047 LHS->isNullPointerConstant(Context)) { 3048 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3049 return RHSTy; 3050 } 3051 3052 const PointerType *LHSPT = LHSTy->getAsPointerType(); 3053 const PointerType *RHSPT = RHSTy->getAsPointerType(); 3054 const BlockPointerType *LHSBPT = LHSTy->getAsBlockPointerType(); 3055 const BlockPointerType *RHSBPT = RHSTy->getAsBlockPointerType(); 3056 3057 // Handle the case where both operands are pointers before we handle null 3058 // pointer constants in case both operands are null pointer constants. 3059 if ((LHSPT || LHSBPT) && (RHSPT || RHSBPT)) { // C99 6.5.15p3,6 3060 // get the "pointed to" types 3061 QualType lhptee = (LHSPT ? LHSPT->getPointeeType() 3062 : LHSBPT->getPointeeType()); 3063 QualType rhptee = (RHSPT ? RHSPT->getPointeeType() 3064 : RHSBPT->getPointeeType()); 3065 3066 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3067 if (lhptee->isVoidType() 3068 && (RHSBPT || rhptee->isIncompleteOrObjectType())) { 3069 // Figure out necessary qualifiers (C99 6.5.15p6) 3070 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3071 QualType destType = Context.getPointerType(destPointee); 3072 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3073 ImpCastExprToType(RHS, destType); // promote to void* 3074 return destType; 3075 } 3076 if (rhptee->isVoidType() 3077 && (LHSBPT || lhptee->isIncompleteOrObjectType())) { 3078 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3079 QualType destType = Context.getPointerType(destPointee); 3080 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3081 ImpCastExprToType(RHS, destType); // promote to void* 3082 return destType; 3083 } 3084 3085 bool sameKind = (LHSPT && RHSPT) || (LHSBPT && RHSBPT); 3086 if (sameKind 3087 && Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3088 // Two identical pointer types are always compatible. 3089 return LHSTy; 3090 } 3091 3092 QualType compositeType = LHSTy; 3093 3094 // If either type is an Objective-C object type then check 3095 // compatibility according to Objective-C. 3096 if (Context.isObjCObjectPointerType(LHSTy) || 3097 Context.isObjCObjectPointerType(RHSTy)) { 3098 // If both operands are interfaces and either operand can be 3099 // assigned to the other, use that type as the composite 3100 // type. This allows 3101 // xxx ? (A*) a : (B*) b 3102 // where B is a subclass of A. 3103 // 3104 // Additionally, as for assignment, if either type is 'id' 3105 // allow silent coercion. Finally, if the types are 3106 // incompatible then make sure to use 'id' as the composite 3107 // type so the result is acceptable for sending messages to. 3108 3109 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3110 // It could return the composite type. 3111 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 3112 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 3113 if (LHSIface && RHSIface && 3114 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 3115 compositeType = LHSTy; 3116 } else if (LHSIface && RHSIface && 3117 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 3118 compositeType = RHSTy; 3119 } else if (Context.isObjCIdStructType(lhptee) || 3120 Context.isObjCIdStructType(rhptee)) { 3121 compositeType = Context.getObjCIdType(); 3122 } else if (LHSBPT || RHSBPT) { 3123 if (!sameKind 3124 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3125 rhptee.getUnqualifiedType())) 3126 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3127 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3128 return QualType(); 3129 } else { 3130 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3131 << LHSTy << RHSTy 3132 << LHS->getSourceRange() << RHS->getSourceRange(); 3133 QualType incompatTy = Context.getObjCIdType(); 3134 ImpCastExprToType(LHS, incompatTy); 3135 ImpCastExprToType(RHS, incompatTy); 3136 return incompatTy; 3137 } 3138 } else if (!sameKind 3139 || !Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3140 rhptee.getUnqualifiedType())) { 3141 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3142 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3143 // In this situation, we assume void* type. No especially good 3144 // reason, but this is what gcc does, and we do have to pick 3145 // to get a consistent AST. 3146 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3147 ImpCastExprToType(LHS, incompatTy); 3148 ImpCastExprToType(RHS, incompatTy); 3149 return incompatTy; 3150 } 3151 // The pointer types are compatible. 3152 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3153 // differently qualified versions of compatible types, the result type is 3154 // a pointer to an appropriately qualified version of the *composite* 3155 // type. 3156 // FIXME: Need to calculate the composite type. 3157 // FIXME: Need to add qualifiers 3158 ImpCastExprToType(LHS, compositeType); 3159 ImpCastExprToType(RHS, compositeType); 3160 return compositeType; 3161 } 3162 3163 // GCC compatibility: soften pointer/integer mismatch. 3164 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3165 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3166 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3167 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3168 return RHSTy; 3169 } 3170 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3171 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3172 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3173 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3174 return LHSTy; 3175 } 3176 3177 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 3178 // evaluates to "struct objc_object *" (and is handled above when comparing 3179 // id with statically typed objects). 3180 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 3181 // GCC allows qualified id and any Objective-C type to devolve to 3182 // id. Currently localizing to here until clear this should be 3183 // part of ObjCQualifiedIdTypesAreCompatible. 3184 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 3185 (LHSTy->isObjCQualifiedIdType() && 3186 Context.isObjCObjectPointerType(RHSTy)) || 3187 (RHSTy->isObjCQualifiedIdType() && 3188 Context.isObjCObjectPointerType(LHSTy))) { 3189 // FIXME: This is not the correct composite type. This only happens to 3190 // work because id can more or less be used anywhere, however this may 3191 // change the type of method sends. 3192 3193 // FIXME: gcc adds some type-checking of the arguments and emits 3194 // (confusing) incompatible comparison warnings in some 3195 // cases. Investigate. 3196 QualType compositeType = Context.getObjCIdType(); 3197 ImpCastExprToType(LHS, compositeType); 3198 ImpCastExprToType(RHS, compositeType); 3199 return compositeType; 3200 } 3201 } 3202 3203 // Otherwise, the operands are not compatible. 3204 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3205 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3206 return QualType(); 3207} 3208 3209/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3210/// in the case of a the GNU conditional expr extension. 3211Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3212 SourceLocation ColonLoc, 3213 ExprArg Cond, ExprArg LHS, 3214 ExprArg RHS) { 3215 Expr *CondExpr = (Expr *) Cond.get(); 3216 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3217 3218 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3219 // was the condition. 3220 bool isLHSNull = LHSExpr == 0; 3221 if (isLHSNull) 3222 LHSExpr = CondExpr; 3223 3224 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3225 RHSExpr, QuestionLoc); 3226 if (result.isNull()) 3227 return ExprError(); 3228 3229 Cond.release(); 3230 LHS.release(); 3231 RHS.release(); 3232 return Owned(new (Context) ConditionalOperator(CondExpr, 3233 isLHSNull ? 0 : LHSExpr, 3234 RHSExpr, result)); 3235} 3236 3237 3238// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3239// being closely modeled after the C99 spec:-). The odd characteristic of this 3240// routine is it effectively iqnores the qualifiers on the top level pointee. 3241// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3242// FIXME: add a couple examples in this comment. 3243Sema::AssignConvertType 3244Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3245 QualType lhptee, rhptee; 3246 3247 // get the "pointed to" type (ignoring qualifiers at the top level) 3248 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3249 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3250 3251 // make sure we operate on the canonical type 3252 lhptee = Context.getCanonicalType(lhptee); 3253 rhptee = Context.getCanonicalType(rhptee); 3254 3255 AssignConvertType ConvTy = Compatible; 3256 3257 // C99 6.5.16.1p1: This following citation is common to constraints 3258 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3259 // qualifiers of the type *pointed to* by the right; 3260 // FIXME: Handle ExtQualType 3261 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3262 ConvTy = CompatiblePointerDiscardsQualifiers; 3263 3264 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3265 // incomplete type and the other is a pointer to a qualified or unqualified 3266 // version of void... 3267 if (lhptee->isVoidType()) { 3268 if (rhptee->isIncompleteOrObjectType()) 3269 return ConvTy; 3270 3271 // As an extension, we allow cast to/from void* to function pointer. 3272 assert(rhptee->isFunctionType()); 3273 return FunctionVoidPointer; 3274 } 3275 3276 if (rhptee->isVoidType()) { 3277 if (lhptee->isIncompleteOrObjectType()) 3278 return ConvTy; 3279 3280 // As an extension, we allow cast to/from void* to function pointer. 3281 assert(lhptee->isFunctionType()); 3282 return FunctionVoidPointer; 3283 } 3284 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3285 // unqualified versions of compatible types, ... 3286 lhptee = lhptee.getUnqualifiedType(); 3287 rhptee = rhptee.getUnqualifiedType(); 3288 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3289 // Check if the pointee types are compatible ignoring the sign. 3290 // We explicitly check for char so that we catch "char" vs 3291 // "unsigned char" on systems where "char" is unsigned. 3292 if (lhptee->isCharType()) { 3293 lhptee = Context.UnsignedCharTy; 3294 } else if (lhptee->isSignedIntegerType()) { 3295 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3296 } 3297 if (rhptee->isCharType()) { 3298 rhptee = Context.UnsignedCharTy; 3299 } else if (rhptee->isSignedIntegerType()) { 3300 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3301 } 3302 if (lhptee == rhptee) { 3303 // Types are compatible ignoring the sign. Qualifier incompatibility 3304 // takes priority over sign incompatibility because the sign 3305 // warning can be disabled. 3306 if (ConvTy != Compatible) 3307 return ConvTy; 3308 return IncompatiblePointerSign; 3309 } 3310 // General pointer incompatibility takes priority over qualifiers. 3311 return IncompatiblePointer; 3312 } 3313 return ConvTy; 3314} 3315 3316/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3317/// block pointer types are compatible or whether a block and normal pointer 3318/// are compatible. It is more restrict than comparing two function pointer 3319// types. 3320Sema::AssignConvertType 3321Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3322 QualType rhsType) { 3323 QualType lhptee, rhptee; 3324 3325 // get the "pointed to" type (ignoring qualifiers at the top level) 3326 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3327 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3328 3329 // make sure we operate on the canonical type 3330 lhptee = Context.getCanonicalType(lhptee); 3331 rhptee = Context.getCanonicalType(rhptee); 3332 3333 AssignConvertType ConvTy = Compatible; 3334 3335 // For blocks we enforce that qualifiers are identical. 3336 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3337 ConvTy = CompatiblePointerDiscardsQualifiers; 3338 3339 if (!Context.typesAreCompatible(lhptee, rhptee)) 3340 return IncompatibleBlockPointer; 3341 return ConvTy; 3342} 3343 3344/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3345/// has code to accommodate several GCC extensions when type checking 3346/// pointers. Here are some objectionable examples that GCC considers warnings: 3347/// 3348/// int a, *pint; 3349/// short *pshort; 3350/// struct foo *pfoo; 3351/// 3352/// pint = pshort; // warning: assignment from incompatible pointer type 3353/// a = pint; // warning: assignment makes integer from pointer without a cast 3354/// pint = a; // warning: assignment makes pointer from integer without a cast 3355/// pint = pfoo; // warning: assignment from incompatible pointer type 3356/// 3357/// As a result, the code for dealing with pointers is more complex than the 3358/// C99 spec dictates. 3359/// 3360Sema::AssignConvertType 3361Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3362 // Get canonical types. We're not formatting these types, just comparing 3363 // them. 3364 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3365 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3366 3367 if (lhsType == rhsType) 3368 return Compatible; // Common case: fast path an exact match. 3369 3370 // If the left-hand side is a reference type, then we are in a 3371 // (rare!) case where we've allowed the use of references in C, 3372 // e.g., as a parameter type in a built-in function. In this case, 3373 // just make sure that the type referenced is compatible with the 3374 // right-hand side type. The caller is responsible for adjusting 3375 // lhsType so that the resulting expression does not have reference 3376 // type. 3377 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3378 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3379 return Compatible; 3380 return Incompatible; 3381 } 3382 3383 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3384 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3385 return Compatible; 3386 // Relax integer conversions like we do for pointers below. 3387 if (rhsType->isIntegerType()) 3388 return IntToPointer; 3389 if (lhsType->isIntegerType()) 3390 return PointerToInt; 3391 return IncompatibleObjCQualifiedId; 3392 } 3393 3394 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3395 // to the same ExtVector type. 3396 if (lhsType->isExtVectorType()) { 3397 if (rhsType->isExtVectorType()) 3398 return lhsType == rhsType ? Compatible : Incompatible; 3399 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3400 return Compatible; 3401 } 3402 3403 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3404 // If we are allowing lax vector conversions, and LHS and RHS are both 3405 // vectors, the total size only needs to be the same. This is a bitcast; 3406 // no bits are changed but the result type is different. 3407 if (getLangOptions().LaxVectorConversions && 3408 lhsType->isVectorType() && rhsType->isVectorType()) { 3409 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3410 return IncompatibleVectors; 3411 } 3412 return Incompatible; 3413 } 3414 3415 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3416 return Compatible; 3417 3418 if (isa<PointerType>(lhsType)) { 3419 if (rhsType->isIntegerType()) 3420 return IntToPointer; 3421 3422 if (isa<PointerType>(rhsType)) 3423 return CheckPointerTypesForAssignment(lhsType, rhsType); 3424 3425 if (rhsType->getAsBlockPointerType()) { 3426 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3427 return Compatible; 3428 3429 // Treat block pointers as objects. 3430 if (getLangOptions().ObjC1 && 3431 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3432 return Compatible; 3433 } 3434 return Incompatible; 3435 } 3436 3437 if (isa<BlockPointerType>(lhsType)) { 3438 if (rhsType->isIntegerType()) 3439 return IntToBlockPointer; 3440 3441 // Treat block pointers as objects. 3442 if (getLangOptions().ObjC1 && 3443 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3444 return Compatible; 3445 3446 if (rhsType->isBlockPointerType()) 3447 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3448 3449 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3450 if (RHSPT->getPointeeType()->isVoidType()) 3451 return Compatible; 3452 } 3453 return Incompatible; 3454 } 3455 3456 if (isa<PointerType>(rhsType)) { 3457 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3458 if (lhsType == Context.BoolTy) 3459 return Compatible; 3460 3461 if (lhsType->isIntegerType()) 3462 return PointerToInt; 3463 3464 if (isa<PointerType>(lhsType)) 3465 return CheckPointerTypesForAssignment(lhsType, rhsType); 3466 3467 if (isa<BlockPointerType>(lhsType) && 3468 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3469 return Compatible; 3470 return Incompatible; 3471 } 3472 3473 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3474 if (Context.typesAreCompatible(lhsType, rhsType)) 3475 return Compatible; 3476 } 3477 return Incompatible; 3478} 3479 3480/// \brief Constructs a transparent union from an expression that is 3481/// used to initialize the transparent union. 3482static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3483 QualType UnionType, FieldDecl *Field) { 3484 // Build an initializer list that designates the appropriate member 3485 // of the transparent union. 3486 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3487 &E, 1, 3488 SourceLocation()); 3489 Initializer->setType(UnionType); 3490 Initializer->setInitializedFieldInUnion(Field); 3491 3492 // Build a compound literal constructing a value of the transparent 3493 // union type from this initializer list. 3494 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3495 false); 3496} 3497 3498Sema::AssignConvertType 3499Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3500 QualType FromType = rExpr->getType(); 3501 3502 // If the ArgType is a Union type, we want to handle a potential 3503 // transparent_union GCC extension. 3504 const RecordType *UT = ArgType->getAsUnionType(); 3505 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3506 return Incompatible; 3507 3508 // The field to initialize within the transparent union. 3509 RecordDecl *UD = UT->getDecl(); 3510 FieldDecl *InitField = 0; 3511 // It's compatible if the expression matches any of the fields. 3512 for (RecordDecl::field_iterator it = UD->field_begin(), 3513 itend = UD->field_end(); 3514 it != itend; ++it) { 3515 if (it->getType()->isPointerType()) { 3516 // If the transparent union contains a pointer type, we allow: 3517 // 1) void pointer 3518 // 2) null pointer constant 3519 if (FromType->isPointerType()) 3520 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3521 ImpCastExprToType(rExpr, it->getType()); 3522 InitField = *it; 3523 break; 3524 } 3525 3526 if (rExpr->isNullPointerConstant(Context)) { 3527 ImpCastExprToType(rExpr, it->getType()); 3528 InitField = *it; 3529 break; 3530 } 3531 } 3532 3533 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3534 == Compatible) { 3535 InitField = *it; 3536 break; 3537 } 3538 } 3539 3540 if (!InitField) 3541 return Incompatible; 3542 3543 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3544 return Compatible; 3545} 3546 3547Sema::AssignConvertType 3548Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3549 if (getLangOptions().CPlusPlus) { 3550 if (!lhsType->isRecordType()) { 3551 // C++ 5.17p3: If the left operand is not of class type, the 3552 // expression is implicitly converted (C++ 4) to the 3553 // cv-unqualified type of the left operand. 3554 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3555 "assigning")) 3556 return Incompatible; 3557 return Compatible; 3558 } 3559 3560 // FIXME: Currently, we fall through and treat C++ classes like C 3561 // structures. 3562 } 3563 3564 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3565 // a null pointer constant. 3566 if ((lhsType->isPointerType() || 3567 lhsType->isObjCQualifiedIdType() || 3568 lhsType->isBlockPointerType()) 3569 && rExpr->isNullPointerConstant(Context)) { 3570 ImpCastExprToType(rExpr, lhsType); 3571 return Compatible; 3572 } 3573 3574 // This check seems unnatural, however it is necessary to ensure the proper 3575 // conversion of functions/arrays. If the conversion were done for all 3576 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3577 // expressions that surpress this implicit conversion (&, sizeof). 3578 // 3579 // Suppress this for references: C++ 8.5.3p5. 3580 if (!lhsType->isReferenceType()) 3581 DefaultFunctionArrayConversion(rExpr); 3582 3583 Sema::AssignConvertType result = 3584 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3585 3586 // C99 6.5.16.1p2: The value of the right operand is converted to the 3587 // type of the assignment expression. 3588 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3589 // so that we can use references in built-in functions even in C. 3590 // The getNonReferenceType() call makes sure that the resulting expression 3591 // does not have reference type. 3592 if (result != Incompatible && rExpr->getType() != lhsType) 3593 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3594 return result; 3595} 3596 3597QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3598 Diag(Loc, diag::err_typecheck_invalid_operands) 3599 << lex->getType() << rex->getType() 3600 << lex->getSourceRange() << rex->getSourceRange(); 3601 return QualType(); 3602} 3603 3604inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3605 Expr *&rex) { 3606 // For conversion purposes, we ignore any qualifiers. 3607 // For example, "const float" and "float" are equivalent. 3608 QualType lhsType = 3609 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3610 QualType rhsType = 3611 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3612 3613 // If the vector types are identical, return. 3614 if (lhsType == rhsType) 3615 return lhsType; 3616 3617 // Handle the case of a vector & extvector type of the same size and element 3618 // type. It would be nice if we only had one vector type someday. 3619 if (getLangOptions().LaxVectorConversions) { 3620 // FIXME: Should we warn here? 3621 if (const VectorType *LV = lhsType->getAsVectorType()) { 3622 if (const VectorType *RV = rhsType->getAsVectorType()) 3623 if (LV->getElementType() == RV->getElementType() && 3624 LV->getNumElements() == RV->getNumElements()) { 3625 return lhsType->isExtVectorType() ? lhsType : rhsType; 3626 } 3627 } 3628 } 3629 3630 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 3631 // swap back (so that we don't reverse the inputs to a subtract, for instance. 3632 bool swapped = false; 3633 if (rhsType->isExtVectorType()) { 3634 swapped = true; 3635 std::swap(rex, lex); 3636 std::swap(rhsType, lhsType); 3637 } 3638 3639 // Handle the case of an ext vector and scalar. 3640 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 3641 QualType EltTy = LV->getElementType(); 3642 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 3643 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 3644 ImpCastExprToType(rex, lhsType); 3645 if (swapped) std::swap(rex, lex); 3646 return lhsType; 3647 } 3648 } 3649 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 3650 rhsType->isRealFloatingType()) { 3651 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 3652 ImpCastExprToType(rex, lhsType); 3653 if (swapped) std::swap(rex, lex); 3654 return lhsType; 3655 } 3656 } 3657 } 3658 3659 // Vectors of different size or scalar and non-ext-vector are errors. 3660 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3661 << lex->getType() << rex->getType() 3662 << lex->getSourceRange() << rex->getSourceRange(); 3663 return QualType(); 3664} 3665 3666inline QualType Sema::CheckMultiplyDivideOperands( 3667 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3668{ 3669 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3670 return CheckVectorOperands(Loc, lex, rex); 3671 3672 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3673 3674 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3675 return compType; 3676 return InvalidOperands(Loc, lex, rex); 3677} 3678 3679inline QualType Sema::CheckRemainderOperands( 3680 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3681{ 3682 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3683 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3684 return CheckVectorOperands(Loc, lex, rex); 3685 return InvalidOperands(Loc, lex, rex); 3686 } 3687 3688 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3689 3690 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3691 return compType; 3692 return InvalidOperands(Loc, lex, rex); 3693} 3694 3695inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3696 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3697{ 3698 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3699 QualType compType = CheckVectorOperands(Loc, lex, rex); 3700 if (CompLHSTy) *CompLHSTy = compType; 3701 return compType; 3702 } 3703 3704 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3705 3706 // handle the common case first (both operands are arithmetic). 3707 if (lex->getType()->isArithmeticType() && 3708 rex->getType()->isArithmeticType()) { 3709 if (CompLHSTy) *CompLHSTy = compType; 3710 return compType; 3711 } 3712 3713 // Put any potential pointer into PExp 3714 Expr* PExp = lex, *IExp = rex; 3715 if (IExp->getType()->isPointerType()) 3716 std::swap(PExp, IExp); 3717 3718 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3719 if (IExp->getType()->isIntegerType()) { 3720 QualType PointeeTy = PTy->getPointeeType(); 3721 // Check for arithmetic on pointers to incomplete types. 3722 if (PointeeTy->isVoidType()) { 3723 if (getLangOptions().CPlusPlus) { 3724 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3725 << lex->getSourceRange() << rex->getSourceRange(); 3726 return QualType(); 3727 } 3728 3729 // GNU extension: arithmetic on pointer to void 3730 Diag(Loc, diag::ext_gnu_void_ptr) 3731 << lex->getSourceRange() << rex->getSourceRange(); 3732 } else if (PointeeTy->isFunctionType()) { 3733 if (getLangOptions().CPlusPlus) { 3734 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3735 << lex->getType() << lex->getSourceRange(); 3736 return QualType(); 3737 } 3738 3739 // GNU extension: arithmetic on pointer to function 3740 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3741 << lex->getType() << lex->getSourceRange(); 3742 } else if (!PTy->isDependentType() && 3743 RequireCompleteType(Loc, PointeeTy, 3744 diag::err_typecheck_arithmetic_incomplete_type, 3745 PExp->getSourceRange(), SourceRange(), 3746 PExp->getType())) 3747 return QualType(); 3748 3749 // Diagnose bad cases where we step over interface counts. 3750 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3751 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3752 << PointeeTy << PExp->getSourceRange(); 3753 return QualType(); 3754 } 3755 3756 if (CompLHSTy) { 3757 QualType LHSTy = lex->getType(); 3758 if (LHSTy->isPromotableIntegerType()) 3759 LHSTy = Context.IntTy; 3760 else { 3761 QualType T = isPromotableBitField(lex, Context); 3762 if (!T.isNull()) 3763 LHSTy = T; 3764 } 3765 3766 *CompLHSTy = LHSTy; 3767 } 3768 return PExp->getType(); 3769 } 3770 } 3771 3772 return InvalidOperands(Loc, lex, rex); 3773} 3774 3775// C99 6.5.6 3776QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3777 SourceLocation Loc, QualType* CompLHSTy) { 3778 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3779 QualType compType = CheckVectorOperands(Loc, lex, rex); 3780 if (CompLHSTy) *CompLHSTy = compType; 3781 return compType; 3782 } 3783 3784 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3785 3786 // Enforce type constraints: C99 6.5.6p3. 3787 3788 // Handle the common case first (both operands are arithmetic). 3789 if (lex->getType()->isArithmeticType() 3790 && rex->getType()->isArithmeticType()) { 3791 if (CompLHSTy) *CompLHSTy = compType; 3792 return compType; 3793 } 3794 3795 // Either ptr - int or ptr - ptr. 3796 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3797 QualType lpointee = LHSPTy->getPointeeType(); 3798 3799 // The LHS must be an completely-defined object type. 3800 3801 bool ComplainAboutVoid = false; 3802 Expr *ComplainAboutFunc = 0; 3803 if (lpointee->isVoidType()) { 3804 if (getLangOptions().CPlusPlus) { 3805 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3806 << lex->getSourceRange() << rex->getSourceRange(); 3807 return QualType(); 3808 } 3809 3810 // GNU C extension: arithmetic on pointer to void 3811 ComplainAboutVoid = true; 3812 } else if (lpointee->isFunctionType()) { 3813 if (getLangOptions().CPlusPlus) { 3814 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3815 << lex->getType() << lex->getSourceRange(); 3816 return QualType(); 3817 } 3818 3819 // GNU C extension: arithmetic on pointer to function 3820 ComplainAboutFunc = lex; 3821 } else if (!lpointee->isDependentType() && 3822 RequireCompleteType(Loc, lpointee, 3823 diag::err_typecheck_sub_ptr_object, 3824 lex->getSourceRange(), 3825 SourceRange(), 3826 lex->getType())) 3827 return QualType(); 3828 3829 // Diagnose bad cases where we step over interface counts. 3830 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3831 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3832 << lpointee << lex->getSourceRange(); 3833 return QualType(); 3834 } 3835 3836 // The result type of a pointer-int computation is the pointer type. 3837 if (rex->getType()->isIntegerType()) { 3838 if (ComplainAboutVoid) 3839 Diag(Loc, diag::ext_gnu_void_ptr) 3840 << lex->getSourceRange() << rex->getSourceRange(); 3841 if (ComplainAboutFunc) 3842 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3843 << ComplainAboutFunc->getType() 3844 << ComplainAboutFunc->getSourceRange(); 3845 3846 if (CompLHSTy) *CompLHSTy = lex->getType(); 3847 return lex->getType(); 3848 } 3849 3850 // Handle pointer-pointer subtractions. 3851 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3852 QualType rpointee = RHSPTy->getPointeeType(); 3853 3854 // RHS must be a completely-type object type. 3855 // Handle the GNU void* extension. 3856 if (rpointee->isVoidType()) { 3857 if (getLangOptions().CPlusPlus) { 3858 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3859 << lex->getSourceRange() << rex->getSourceRange(); 3860 return QualType(); 3861 } 3862 3863 ComplainAboutVoid = true; 3864 } else if (rpointee->isFunctionType()) { 3865 if (getLangOptions().CPlusPlus) { 3866 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3867 << rex->getType() << rex->getSourceRange(); 3868 return QualType(); 3869 } 3870 3871 // GNU extension: arithmetic on pointer to function 3872 if (!ComplainAboutFunc) 3873 ComplainAboutFunc = rex; 3874 } else if (!rpointee->isDependentType() && 3875 RequireCompleteType(Loc, rpointee, 3876 diag::err_typecheck_sub_ptr_object, 3877 rex->getSourceRange(), 3878 SourceRange(), 3879 rex->getType())) 3880 return QualType(); 3881 3882 if (getLangOptions().CPlusPlus) { 3883 // Pointee types must be the same: C++ [expr.add] 3884 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 3885 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3886 << lex->getType() << rex->getType() 3887 << lex->getSourceRange() << rex->getSourceRange(); 3888 return QualType(); 3889 } 3890 } else { 3891 // Pointee types must be compatible C99 6.5.6p3 3892 if (!Context.typesAreCompatible( 3893 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3894 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3895 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3896 << lex->getType() << rex->getType() 3897 << lex->getSourceRange() << rex->getSourceRange(); 3898 return QualType(); 3899 } 3900 } 3901 3902 if (ComplainAboutVoid) 3903 Diag(Loc, diag::ext_gnu_void_ptr) 3904 << lex->getSourceRange() << rex->getSourceRange(); 3905 if (ComplainAboutFunc) 3906 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3907 << ComplainAboutFunc->getType() 3908 << ComplainAboutFunc->getSourceRange(); 3909 3910 if (CompLHSTy) *CompLHSTy = lex->getType(); 3911 return Context.getPointerDiffType(); 3912 } 3913 } 3914 3915 return InvalidOperands(Loc, lex, rex); 3916} 3917 3918// C99 6.5.7 3919QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3920 bool isCompAssign) { 3921 // C99 6.5.7p2: Each of the operands shall have integer type. 3922 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3923 return InvalidOperands(Loc, lex, rex); 3924 3925 // Shifts don't perform usual arithmetic conversions, they just do integer 3926 // promotions on each operand. C99 6.5.7p3 3927 QualType LHSTy; 3928 if (lex->getType()->isPromotableIntegerType()) 3929 LHSTy = Context.IntTy; 3930 else { 3931 LHSTy = isPromotableBitField(lex, Context); 3932 if (LHSTy.isNull()) 3933 LHSTy = lex->getType(); 3934 } 3935 if (!isCompAssign) 3936 ImpCastExprToType(lex, LHSTy); 3937 3938 UsualUnaryConversions(rex); 3939 3940 // "The type of the result is that of the promoted left operand." 3941 return LHSTy; 3942} 3943 3944// C99 6.5.8, C++ [expr.rel] 3945QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3946 unsigned OpaqueOpc, bool isRelational) { 3947 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3948 3949 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3950 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3951 3952 // C99 6.5.8p3 / C99 6.5.9p4 3953 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3954 UsualArithmeticConversions(lex, rex); 3955 else { 3956 UsualUnaryConversions(lex); 3957 UsualUnaryConversions(rex); 3958 } 3959 QualType lType = lex->getType(); 3960 QualType rType = rex->getType(); 3961 3962 if (!lType->isFloatingType() 3963 && !(lType->isBlockPointerType() && isRelational)) { 3964 // For non-floating point types, check for self-comparisons of the form 3965 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3966 // often indicate logic errors in the program. 3967 // NOTE: Don't warn about comparisons of enum constants. These can arise 3968 // from macro expansions, and are usually quite deliberate. 3969 Expr *LHSStripped = lex->IgnoreParens(); 3970 Expr *RHSStripped = rex->IgnoreParens(); 3971 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3972 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3973 if (DRL->getDecl() == DRR->getDecl() && 3974 !isa<EnumConstantDecl>(DRL->getDecl())) 3975 Diag(Loc, diag::warn_selfcomparison); 3976 3977 if (isa<CastExpr>(LHSStripped)) 3978 LHSStripped = LHSStripped->IgnoreParenCasts(); 3979 if (isa<CastExpr>(RHSStripped)) 3980 RHSStripped = RHSStripped->IgnoreParenCasts(); 3981 3982 // Warn about comparisons against a string constant (unless the other 3983 // operand is null), the user probably wants strcmp. 3984 Expr *literalString = 0; 3985 Expr *literalStringStripped = 0; 3986 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3987 !RHSStripped->isNullPointerConstant(Context)) { 3988 literalString = lex; 3989 literalStringStripped = LHSStripped; 3990 } 3991 else if ((isa<StringLiteral>(RHSStripped) || 3992 isa<ObjCEncodeExpr>(RHSStripped)) && 3993 !LHSStripped->isNullPointerConstant(Context)) { 3994 literalString = rex; 3995 literalStringStripped = RHSStripped; 3996 } 3997 3998 if (literalString) { 3999 std::string resultComparison; 4000 switch (Opc) { 4001 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4002 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4003 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4004 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4005 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4006 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4007 default: assert(false && "Invalid comparison operator"); 4008 } 4009 Diag(Loc, diag::warn_stringcompare) 4010 << isa<ObjCEncodeExpr>(literalStringStripped) 4011 << literalString->getSourceRange() 4012 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4013 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4014 "strcmp(") 4015 << CodeModificationHint::CreateInsertion( 4016 PP.getLocForEndOfToken(rex->getLocEnd()), 4017 resultComparison); 4018 } 4019 } 4020 4021 // The result of comparisons is 'bool' in C++, 'int' in C. 4022 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4023 4024 if (isRelational) { 4025 if (lType->isRealType() && rType->isRealType()) 4026 return ResultTy; 4027 } else { 4028 // Check for comparisons of floating point operands using != and ==. 4029 if (lType->isFloatingType()) { 4030 assert(rType->isFloatingType()); 4031 CheckFloatComparison(Loc,lex,rex); 4032 } 4033 4034 if (lType->isArithmeticType() && rType->isArithmeticType()) 4035 return ResultTy; 4036 } 4037 4038 bool LHSIsNull = lex->isNullPointerConstant(Context); 4039 bool RHSIsNull = rex->isNullPointerConstant(Context); 4040 4041 // All of the following pointer related warnings are GCC extensions, except 4042 // when handling null pointer constants. One day, we can consider making them 4043 // errors (when -pedantic-errors is enabled). 4044 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4045 QualType LCanPointeeTy = 4046 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 4047 QualType RCanPointeeTy = 4048 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 4049 4050 if (rType->isFunctionPointerType() || lType->isFunctionPointerType()) { 4051 if (isRelational) { 4052 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4053 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4054 } 4055 } 4056 if (((!LHSIsNull || isRelational) && LCanPointeeTy->isVoidType()) != 4057 ((!RHSIsNull || isRelational) && RCanPointeeTy->isVoidType())) { 4058 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4059 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4060 } 4061 // Simple check: if the pointee types are identical, we're done. 4062 if (LCanPointeeTy == RCanPointeeTy) 4063 return ResultTy; 4064 4065 if (getLangOptions().CPlusPlus) { 4066 // C++ [expr.rel]p2: 4067 // [...] Pointer conversions (4.10) and qualification 4068 // conversions (4.4) are performed on pointer operands (or on 4069 // a pointer operand and a null pointer constant) to bring 4070 // them to their composite pointer type. [...] 4071 // 4072 // C++ [expr.eq]p2 uses the same notion for (in)equality 4073 // comparisons of pointers. 4074 QualType T = FindCompositePointerType(lex, rex); 4075 if (T.isNull()) { 4076 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4077 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4078 return QualType(); 4079 } 4080 4081 ImpCastExprToType(lex, T); 4082 ImpCastExprToType(rex, T); 4083 return ResultTy; 4084 } 4085 4086 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 4087 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 4088 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4089 RCanPointeeTy.getUnqualifiedType()) && 4090 !Context.areComparableObjCPointerTypes(lType, rType)) { 4091 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4092 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4093 } 4094 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4095 return ResultTy; 4096 } 4097 // C++ allows comparison of pointers with null pointer constants. 4098 if (getLangOptions().CPlusPlus) { 4099 if (lType->isPointerType() && RHSIsNull) { 4100 ImpCastExprToType(rex, lType); 4101 return ResultTy; 4102 } 4103 if (rType->isPointerType() && LHSIsNull) { 4104 ImpCastExprToType(lex, rType); 4105 return ResultTy; 4106 } 4107 // And comparison of nullptr_t with itself. 4108 if (lType->isNullPtrType() && rType->isNullPtrType()) 4109 return ResultTy; 4110 } 4111 // Handle block pointer types. 4112 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4113 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4114 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4115 4116 if (!LHSIsNull && !RHSIsNull && 4117 !Context.typesAreCompatible(lpointee, rpointee)) { 4118 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4119 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4120 } 4121 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4122 return ResultTy; 4123 } 4124 // Allow block pointers to be compared with null pointer constants. 4125 if (!isRelational 4126 && ((lType->isBlockPointerType() && rType->isPointerType()) 4127 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4128 if (!LHSIsNull && !RHSIsNull) { 4129 if (!((rType->isPointerType() && rType->getAsPointerType() 4130 ->getPointeeType()->isVoidType()) 4131 || (lType->isPointerType() && lType->getAsPointerType() 4132 ->getPointeeType()->isVoidType()))) 4133 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4134 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4135 } 4136 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4137 return ResultTy; 4138 } 4139 4140 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 4141 if (lType->isPointerType() || rType->isPointerType()) { 4142 const PointerType *LPT = lType->getAsPointerType(); 4143 const PointerType *RPT = rType->getAsPointerType(); 4144 bool LPtrToVoid = LPT ? 4145 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4146 bool RPtrToVoid = RPT ? 4147 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4148 4149 if (!LPtrToVoid && !RPtrToVoid && 4150 !Context.typesAreCompatible(lType, rType)) { 4151 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4152 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4153 ImpCastExprToType(rex, lType); 4154 return ResultTy; 4155 } 4156 ImpCastExprToType(rex, lType); 4157 return ResultTy; 4158 } 4159 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 4160 ImpCastExprToType(rex, lType); 4161 return ResultTy; 4162 } else { 4163 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 4164 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 4165 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4166 ImpCastExprToType(rex, lType); 4167 return ResultTy; 4168 } 4169 } 4170 } 4171 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 4172 rType->isIntegerType()) { 4173 if (isRelational) 4174 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4175 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4176 else if (!RHSIsNull) 4177 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4178 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4179 ImpCastExprToType(rex, lType); // promote the integer to pointer 4180 return ResultTy; 4181 } 4182 if (lType->isIntegerType() && 4183 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 4184 if (isRelational) 4185 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4186 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4187 else if (!LHSIsNull) 4188 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4189 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4190 ImpCastExprToType(lex, rType); // promote the integer to pointer 4191 return ResultTy; 4192 } 4193 // Handle block pointers. 4194 if (!isRelational && RHSIsNull 4195 && lType->isBlockPointerType() && rType->isIntegerType()) { 4196 ImpCastExprToType(rex, lType); // promote the integer to pointer 4197 return ResultTy; 4198 } 4199 if (!isRelational && LHSIsNull 4200 && lType->isIntegerType() && rType->isBlockPointerType()) { 4201 ImpCastExprToType(lex, rType); // promote the integer to pointer 4202 return ResultTy; 4203 } 4204 return InvalidOperands(Loc, lex, rex); 4205} 4206 4207/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4208/// operates on extended vector types. Instead of producing an IntTy result, 4209/// like a scalar comparison, a vector comparison produces a vector of integer 4210/// types. 4211QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4212 SourceLocation Loc, 4213 bool isRelational) { 4214 // Check to make sure we're operating on vectors of the same type and width, 4215 // Allowing one side to be a scalar of element type. 4216 QualType vType = CheckVectorOperands(Loc, lex, rex); 4217 if (vType.isNull()) 4218 return vType; 4219 4220 QualType lType = lex->getType(); 4221 QualType rType = rex->getType(); 4222 4223 // For non-floating point types, check for self-comparisons of the form 4224 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4225 // often indicate logic errors in the program. 4226 if (!lType->isFloatingType()) { 4227 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4228 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4229 if (DRL->getDecl() == DRR->getDecl()) 4230 Diag(Loc, diag::warn_selfcomparison); 4231 } 4232 4233 // Check for comparisons of floating point operands using != and ==. 4234 if (!isRelational && lType->isFloatingType()) { 4235 assert (rType->isFloatingType()); 4236 CheckFloatComparison(Loc,lex,rex); 4237 } 4238 4239 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 4240 // just reject all vector comparisons for now. 4241 if (1) { 4242 Diag(Loc, diag::err_typecheck_vector_comparison) 4243 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4244 return QualType(); 4245 } 4246 4247 // Return the type for the comparison, which is the same as vector type for 4248 // integer vectors, or an integer type of identical size and number of 4249 // elements for floating point vectors. 4250 if (lType->isIntegerType()) 4251 return lType; 4252 4253 const VectorType *VTy = lType->getAsVectorType(); 4254 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4255 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4256 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4257 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4258 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4259 4260 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4261 "Unhandled vector element size in vector compare"); 4262 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4263} 4264 4265inline QualType Sema::CheckBitwiseOperands( 4266 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4267{ 4268 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4269 return CheckVectorOperands(Loc, lex, rex); 4270 4271 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4272 4273 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4274 return compType; 4275 return InvalidOperands(Loc, lex, rex); 4276} 4277 4278inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4279 Expr *&lex, Expr *&rex, SourceLocation Loc) 4280{ 4281 UsualUnaryConversions(lex); 4282 UsualUnaryConversions(rex); 4283 4284 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4285 return Context.IntTy; 4286 return InvalidOperands(Loc, lex, rex); 4287} 4288 4289/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4290/// is a read-only property; return true if so. A readonly property expression 4291/// depends on various declarations and thus must be treated specially. 4292/// 4293static bool IsReadonlyProperty(Expr *E, Sema &S) 4294{ 4295 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4296 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4297 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4298 QualType BaseType = PropExpr->getBase()->getType(); 4299 if (const PointerType *PTy = BaseType->getAsPointerType()) 4300 if (const ObjCInterfaceType *IFTy = 4301 PTy->getPointeeType()->getAsObjCInterfaceType()) 4302 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 4303 if (S.isPropertyReadonly(PDecl, IFace)) 4304 return true; 4305 } 4306 } 4307 return false; 4308} 4309 4310/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4311/// emit an error and return true. If so, return false. 4312static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4313 SourceLocation OrigLoc = Loc; 4314 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4315 &Loc); 4316 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4317 IsLV = Expr::MLV_ReadonlyProperty; 4318 if (IsLV == Expr::MLV_Valid) 4319 return false; 4320 4321 unsigned Diag = 0; 4322 bool NeedType = false; 4323 switch (IsLV) { // C99 6.5.16p2 4324 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4325 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4326 case Expr::MLV_ArrayType: 4327 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4328 NeedType = true; 4329 break; 4330 case Expr::MLV_NotObjectType: 4331 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4332 NeedType = true; 4333 break; 4334 case Expr::MLV_LValueCast: 4335 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4336 break; 4337 case Expr::MLV_InvalidExpression: 4338 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4339 break; 4340 case Expr::MLV_IncompleteType: 4341 case Expr::MLV_IncompleteVoidType: 4342 return S.RequireCompleteType(Loc, E->getType(), 4343 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4344 E->getSourceRange()); 4345 case Expr::MLV_DuplicateVectorComponents: 4346 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4347 break; 4348 case Expr::MLV_NotBlockQualified: 4349 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4350 break; 4351 case Expr::MLV_ReadonlyProperty: 4352 Diag = diag::error_readonly_property_assignment; 4353 break; 4354 case Expr::MLV_NoSetterProperty: 4355 Diag = diag::error_nosetter_property_assignment; 4356 break; 4357 } 4358 4359 SourceRange Assign; 4360 if (Loc != OrigLoc) 4361 Assign = SourceRange(OrigLoc, OrigLoc); 4362 if (NeedType) 4363 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4364 else 4365 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4366 return true; 4367} 4368 4369 4370 4371// C99 6.5.16.1 4372QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4373 SourceLocation Loc, 4374 QualType CompoundType) { 4375 // Verify that LHS is a modifiable lvalue, and emit error if not. 4376 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4377 return QualType(); 4378 4379 QualType LHSType = LHS->getType(); 4380 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4381 4382 AssignConvertType ConvTy; 4383 if (CompoundType.isNull()) { 4384 // Simple assignment "x = y". 4385 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4386 // Special case of NSObject attributes on c-style pointer types. 4387 if (ConvTy == IncompatiblePointer && 4388 ((Context.isObjCNSObjectType(LHSType) && 4389 Context.isObjCObjectPointerType(RHSType)) || 4390 (Context.isObjCNSObjectType(RHSType) && 4391 Context.isObjCObjectPointerType(LHSType)))) 4392 ConvTy = Compatible; 4393 4394 // If the RHS is a unary plus or minus, check to see if they = and + are 4395 // right next to each other. If so, the user may have typo'd "x =+ 4" 4396 // instead of "x += 4". 4397 Expr *RHSCheck = RHS; 4398 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4399 RHSCheck = ICE->getSubExpr(); 4400 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4401 if ((UO->getOpcode() == UnaryOperator::Plus || 4402 UO->getOpcode() == UnaryOperator::Minus) && 4403 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4404 // Only if the two operators are exactly adjacent. 4405 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4406 // And there is a space or other character before the subexpr of the 4407 // unary +/-. We don't want to warn on "x=-1". 4408 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4409 UO->getSubExpr()->getLocStart().isFileID()) { 4410 Diag(Loc, diag::warn_not_compound_assign) 4411 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4412 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4413 } 4414 } 4415 } else { 4416 // Compound assignment "x += y" 4417 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4418 } 4419 4420 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4421 RHS, "assigning")) 4422 return QualType(); 4423 4424 // C99 6.5.16p3: The type of an assignment expression is the type of the 4425 // left operand unless the left operand has qualified type, in which case 4426 // it is the unqualified version of the type of the left operand. 4427 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4428 // is converted to the type of the assignment expression (above). 4429 // C++ 5.17p1: the type of the assignment expression is that of its left 4430 // operand. 4431 return LHSType.getUnqualifiedType(); 4432} 4433 4434// C99 6.5.17 4435QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4436 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4437 DefaultFunctionArrayConversion(RHS); 4438 4439 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4440 // incomplete in C++). 4441 4442 return RHS->getType(); 4443} 4444 4445/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4446/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4447QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4448 bool isInc) { 4449 if (Op->isTypeDependent()) 4450 return Context.DependentTy; 4451 4452 QualType ResType = Op->getType(); 4453 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4454 4455 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4456 // Decrement of bool is not allowed. 4457 if (!isInc) { 4458 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4459 return QualType(); 4460 } 4461 // Increment of bool sets it to true, but is deprecated. 4462 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4463 } else if (ResType->isRealType()) { 4464 // OK! 4465 } else if (const PointerType *PT = ResType->getAsPointerType()) { 4466 // C99 6.5.2.4p2, 6.5.6p2 4467 if (PT->getPointeeType()->isVoidType()) { 4468 if (getLangOptions().CPlusPlus) { 4469 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4470 << Op->getSourceRange(); 4471 return QualType(); 4472 } 4473 4474 // Pointer to void is a GNU extension in C. 4475 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4476 } else if (PT->getPointeeType()->isFunctionType()) { 4477 if (getLangOptions().CPlusPlus) { 4478 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4479 << Op->getType() << Op->getSourceRange(); 4480 return QualType(); 4481 } 4482 4483 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4484 << ResType << Op->getSourceRange(); 4485 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 4486 diag::err_typecheck_arithmetic_incomplete_type, 4487 Op->getSourceRange(), SourceRange(), 4488 ResType)) 4489 return QualType(); 4490 } else if (ResType->isComplexType()) { 4491 // C99 does not support ++/-- on complex types, we allow as an extension. 4492 Diag(OpLoc, diag::ext_integer_increment_complex) 4493 << ResType << Op->getSourceRange(); 4494 } else { 4495 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4496 << ResType << Op->getSourceRange(); 4497 return QualType(); 4498 } 4499 // At this point, we know we have a real, complex or pointer type. 4500 // Now make sure the operand is a modifiable lvalue. 4501 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4502 return QualType(); 4503 return ResType; 4504} 4505 4506/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4507/// This routine allows us to typecheck complex/recursive expressions 4508/// where the declaration is needed for type checking. We only need to 4509/// handle cases when the expression references a function designator 4510/// or is an lvalue. Here are some examples: 4511/// - &(x) => x 4512/// - &*****f => f for f a function designator. 4513/// - &s.xx => s 4514/// - &s.zz[1].yy -> s, if zz is an array 4515/// - *(x + 1) -> x, if x is an array 4516/// - &"123"[2] -> 0 4517/// - & __real__ x -> x 4518static NamedDecl *getPrimaryDecl(Expr *E) { 4519 switch (E->getStmtClass()) { 4520 case Stmt::DeclRefExprClass: 4521 case Stmt::QualifiedDeclRefExprClass: 4522 return cast<DeclRefExpr>(E)->getDecl(); 4523 case Stmt::MemberExprClass: 4524 // If this is an arrow operator, the address is an offset from 4525 // the base's value, so the object the base refers to is 4526 // irrelevant. 4527 if (cast<MemberExpr>(E)->isArrow()) 4528 return 0; 4529 // Otherwise, the expression refers to a part of the base 4530 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4531 case Stmt::ArraySubscriptExprClass: { 4532 // FIXME: This code shouldn't be necessary! We should catch the implicit 4533 // promotion of register arrays earlier. 4534 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4535 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4536 if (ICE->getSubExpr()->getType()->isArrayType()) 4537 return getPrimaryDecl(ICE->getSubExpr()); 4538 } 4539 return 0; 4540 } 4541 case Stmt::UnaryOperatorClass: { 4542 UnaryOperator *UO = cast<UnaryOperator>(E); 4543 4544 switch(UO->getOpcode()) { 4545 case UnaryOperator::Real: 4546 case UnaryOperator::Imag: 4547 case UnaryOperator::Extension: 4548 return getPrimaryDecl(UO->getSubExpr()); 4549 default: 4550 return 0; 4551 } 4552 } 4553 case Stmt::ParenExprClass: 4554 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4555 case Stmt::ImplicitCastExprClass: 4556 // If the result of an implicit cast is an l-value, we care about 4557 // the sub-expression; otherwise, the result here doesn't matter. 4558 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4559 default: 4560 return 0; 4561 } 4562} 4563 4564/// CheckAddressOfOperand - The operand of & must be either a function 4565/// designator or an lvalue designating an object. If it is an lvalue, the 4566/// object cannot be declared with storage class register or be a bit field. 4567/// Note: The usual conversions are *not* applied to the operand of the & 4568/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4569/// In C++, the operand might be an overloaded function name, in which case 4570/// we allow the '&' but retain the overloaded-function type. 4571QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4572 // Make sure to ignore parentheses in subsequent checks 4573 op = op->IgnoreParens(); 4574 4575 if (op->isTypeDependent()) 4576 return Context.DependentTy; 4577 4578 if (getLangOptions().C99) { 4579 // Implement C99-only parts of addressof rules. 4580 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4581 if (uOp->getOpcode() == UnaryOperator::Deref) 4582 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4583 // (assuming the deref expression is valid). 4584 return uOp->getSubExpr()->getType(); 4585 } 4586 // Technically, there should be a check for array subscript 4587 // expressions here, but the result of one is always an lvalue anyway. 4588 } 4589 NamedDecl *dcl = getPrimaryDecl(op); 4590 Expr::isLvalueResult lval = op->isLvalue(Context); 4591 4592 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4593 // C99 6.5.3.2p1 4594 // The operand must be either an l-value or a function designator 4595 if (!op->getType()->isFunctionType()) { 4596 // FIXME: emit more specific diag... 4597 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4598 << op->getSourceRange(); 4599 return QualType(); 4600 } 4601 } else if (op->getBitField()) { // C99 6.5.3.2p1 4602 // The operand cannot be a bit-field 4603 Diag(OpLoc, diag::err_typecheck_address_of) 4604 << "bit-field" << op->getSourceRange(); 4605 return QualType(); 4606 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4607 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4608 // The operand cannot be an element of a vector 4609 Diag(OpLoc, diag::err_typecheck_address_of) 4610 << "vector element" << op->getSourceRange(); 4611 return QualType(); 4612 } else if (dcl) { // C99 6.5.3.2p1 4613 // We have an lvalue with a decl. Make sure the decl is not declared 4614 // with the register storage-class specifier. 4615 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4616 if (vd->getStorageClass() == VarDecl::Register) { 4617 Diag(OpLoc, diag::err_typecheck_address_of) 4618 << "register variable" << op->getSourceRange(); 4619 return QualType(); 4620 } 4621 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4622 return Context.OverloadTy; 4623 } else if (isa<FieldDecl>(dcl)) { 4624 // Okay: we can take the address of a field. 4625 // Could be a pointer to member, though, if there is an explicit 4626 // scope qualifier for the class. 4627 if (isa<QualifiedDeclRefExpr>(op)) { 4628 DeclContext *Ctx = dcl->getDeclContext(); 4629 if (Ctx && Ctx->isRecord()) 4630 return Context.getMemberPointerType(op->getType(), 4631 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4632 } 4633 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4634 // Okay: we can take the address of a function. 4635 // As above. 4636 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4637 return Context.getMemberPointerType(op->getType(), 4638 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4639 } else if (!isa<FunctionDecl>(dcl)) 4640 assert(0 && "Unknown/unexpected decl type"); 4641 } 4642 4643 if (lval == Expr::LV_IncompleteVoidType) { 4644 // Taking the address of a void variable is technically illegal, but we 4645 // allow it in cases which are otherwise valid. 4646 // Example: "extern void x; void* y = &x;". 4647 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4648 } 4649 4650 // If the operand has type "type", the result has type "pointer to type". 4651 return Context.getPointerType(op->getType()); 4652} 4653 4654QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4655 if (Op->isTypeDependent()) 4656 return Context.DependentTy; 4657 4658 UsualUnaryConversions(Op); 4659 QualType Ty = Op->getType(); 4660 4661 // Note that per both C89 and C99, this is always legal, even if ptype is an 4662 // incomplete type or void. It would be possible to warn about dereferencing 4663 // a void pointer, but it's completely well-defined, and such a warning is 4664 // unlikely to catch any mistakes. 4665 if (const PointerType *PT = Ty->getAsPointerType()) 4666 return PT->getPointeeType(); 4667 4668 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4669 << Ty << Op->getSourceRange(); 4670 return QualType(); 4671} 4672 4673static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4674 tok::TokenKind Kind) { 4675 BinaryOperator::Opcode Opc; 4676 switch (Kind) { 4677 default: assert(0 && "Unknown binop!"); 4678 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4679 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4680 case tok::star: Opc = BinaryOperator::Mul; break; 4681 case tok::slash: Opc = BinaryOperator::Div; break; 4682 case tok::percent: Opc = BinaryOperator::Rem; break; 4683 case tok::plus: Opc = BinaryOperator::Add; break; 4684 case tok::minus: Opc = BinaryOperator::Sub; break; 4685 case tok::lessless: Opc = BinaryOperator::Shl; break; 4686 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4687 case tok::lessequal: Opc = BinaryOperator::LE; break; 4688 case tok::less: Opc = BinaryOperator::LT; break; 4689 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4690 case tok::greater: Opc = BinaryOperator::GT; break; 4691 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4692 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4693 case tok::amp: Opc = BinaryOperator::And; break; 4694 case tok::caret: Opc = BinaryOperator::Xor; break; 4695 case tok::pipe: Opc = BinaryOperator::Or; break; 4696 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4697 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4698 case tok::equal: Opc = BinaryOperator::Assign; break; 4699 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4700 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4701 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4702 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4703 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4704 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4705 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4706 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4707 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4708 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4709 case tok::comma: Opc = BinaryOperator::Comma; break; 4710 } 4711 return Opc; 4712} 4713 4714static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4715 tok::TokenKind Kind) { 4716 UnaryOperator::Opcode Opc; 4717 switch (Kind) { 4718 default: assert(0 && "Unknown unary op!"); 4719 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4720 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4721 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4722 case tok::star: Opc = UnaryOperator::Deref; break; 4723 case tok::plus: Opc = UnaryOperator::Plus; break; 4724 case tok::minus: Opc = UnaryOperator::Minus; break; 4725 case tok::tilde: Opc = UnaryOperator::Not; break; 4726 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4727 case tok::kw___real: Opc = UnaryOperator::Real; break; 4728 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4729 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4730 } 4731 return Opc; 4732} 4733 4734/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4735/// operator @p Opc at location @c TokLoc. This routine only supports 4736/// built-in operations; ActOnBinOp handles overloaded operators. 4737Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4738 unsigned Op, 4739 Expr *lhs, Expr *rhs) { 4740 QualType ResultTy; // Result type of the binary operator. 4741 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4742 // The following two variables are used for compound assignment operators 4743 QualType CompLHSTy; // Type of LHS after promotions for computation 4744 QualType CompResultTy; // Type of computation result 4745 4746 switch (Opc) { 4747 case BinaryOperator::Assign: 4748 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4749 break; 4750 case BinaryOperator::PtrMemD: 4751 case BinaryOperator::PtrMemI: 4752 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4753 Opc == BinaryOperator::PtrMemI); 4754 break; 4755 case BinaryOperator::Mul: 4756 case BinaryOperator::Div: 4757 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4758 break; 4759 case BinaryOperator::Rem: 4760 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4761 break; 4762 case BinaryOperator::Add: 4763 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4764 break; 4765 case BinaryOperator::Sub: 4766 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4767 break; 4768 case BinaryOperator::Shl: 4769 case BinaryOperator::Shr: 4770 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4771 break; 4772 case BinaryOperator::LE: 4773 case BinaryOperator::LT: 4774 case BinaryOperator::GE: 4775 case BinaryOperator::GT: 4776 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4777 break; 4778 case BinaryOperator::EQ: 4779 case BinaryOperator::NE: 4780 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4781 break; 4782 case BinaryOperator::And: 4783 case BinaryOperator::Xor: 4784 case BinaryOperator::Or: 4785 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4786 break; 4787 case BinaryOperator::LAnd: 4788 case BinaryOperator::LOr: 4789 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4790 break; 4791 case BinaryOperator::MulAssign: 4792 case BinaryOperator::DivAssign: 4793 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4794 CompLHSTy = CompResultTy; 4795 if (!CompResultTy.isNull()) 4796 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4797 break; 4798 case BinaryOperator::RemAssign: 4799 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4800 CompLHSTy = CompResultTy; 4801 if (!CompResultTy.isNull()) 4802 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4803 break; 4804 case BinaryOperator::AddAssign: 4805 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4806 if (!CompResultTy.isNull()) 4807 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4808 break; 4809 case BinaryOperator::SubAssign: 4810 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4811 if (!CompResultTy.isNull()) 4812 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4813 break; 4814 case BinaryOperator::ShlAssign: 4815 case BinaryOperator::ShrAssign: 4816 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4817 CompLHSTy = CompResultTy; 4818 if (!CompResultTy.isNull()) 4819 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4820 break; 4821 case BinaryOperator::AndAssign: 4822 case BinaryOperator::XorAssign: 4823 case BinaryOperator::OrAssign: 4824 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4825 CompLHSTy = CompResultTy; 4826 if (!CompResultTy.isNull()) 4827 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4828 break; 4829 case BinaryOperator::Comma: 4830 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4831 break; 4832 } 4833 if (ResultTy.isNull()) 4834 return ExprError(); 4835 if (CompResultTy.isNull()) 4836 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4837 else 4838 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4839 CompLHSTy, CompResultTy, 4840 OpLoc)); 4841} 4842 4843// Binary Operators. 'Tok' is the token for the operator. 4844Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4845 tok::TokenKind Kind, 4846 ExprArg LHS, ExprArg RHS) { 4847 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4848 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 4849 4850 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4851 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4852 4853 if (getLangOptions().CPlusPlus && 4854 (lhs->getType()->isOverloadableType() || 4855 rhs->getType()->isOverloadableType())) { 4856 // Find all of the overloaded operators visible from this 4857 // point. We perform both an operator-name lookup from the local 4858 // scope and an argument-dependent lookup based on the types of 4859 // the arguments. 4860 FunctionSet Functions; 4861 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4862 if (OverOp != OO_None) { 4863 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4864 Functions); 4865 Expr *Args[2] = { lhs, rhs }; 4866 DeclarationName OpName 4867 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4868 ArgumentDependentLookup(OpName, Args, 2, Functions); 4869 } 4870 4871 // Build the (potentially-overloaded, potentially-dependent) 4872 // binary operation. 4873 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4874 } 4875 4876 // Build a built-in binary operation. 4877 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4878} 4879 4880Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4881 unsigned OpcIn, 4882 ExprArg InputArg) { 4883 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4884 4885 // FIXME: Input is modified below, but InputArg is not updated appropriately. 4886 Expr *Input = (Expr *)InputArg.get(); 4887 QualType resultType; 4888 switch (Opc) { 4889 case UnaryOperator::PostInc: 4890 case UnaryOperator::PostDec: 4891 case UnaryOperator::OffsetOf: 4892 assert(false && "Invalid unary operator"); 4893 break; 4894 4895 case UnaryOperator::PreInc: 4896 case UnaryOperator::PreDec: 4897 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4898 Opc == UnaryOperator::PreInc); 4899 break; 4900 case UnaryOperator::AddrOf: 4901 resultType = CheckAddressOfOperand(Input, OpLoc); 4902 break; 4903 case UnaryOperator::Deref: 4904 DefaultFunctionArrayConversion(Input); 4905 resultType = CheckIndirectionOperand(Input, OpLoc); 4906 break; 4907 case UnaryOperator::Plus: 4908 case UnaryOperator::Minus: 4909 UsualUnaryConversions(Input); 4910 resultType = Input->getType(); 4911 if (resultType->isDependentType()) 4912 break; 4913 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4914 break; 4915 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4916 resultType->isEnumeralType()) 4917 break; 4918 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4919 Opc == UnaryOperator::Plus && 4920 resultType->isPointerType()) 4921 break; 4922 4923 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4924 << resultType << Input->getSourceRange()); 4925 case UnaryOperator::Not: // bitwise complement 4926 UsualUnaryConversions(Input); 4927 resultType = Input->getType(); 4928 if (resultType->isDependentType()) 4929 break; 4930 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4931 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4932 // C99 does not support '~' for complex conjugation. 4933 Diag(OpLoc, diag::ext_integer_complement_complex) 4934 << resultType << Input->getSourceRange(); 4935 else if (!resultType->isIntegerType()) 4936 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4937 << resultType << Input->getSourceRange()); 4938 break; 4939 case UnaryOperator::LNot: // logical negation 4940 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4941 DefaultFunctionArrayConversion(Input); 4942 resultType = Input->getType(); 4943 if (resultType->isDependentType()) 4944 break; 4945 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4946 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4947 << resultType << Input->getSourceRange()); 4948 // LNot always has type int. C99 6.5.3.3p5. 4949 // In C++, it's bool. C++ 5.3.1p8 4950 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4951 break; 4952 case UnaryOperator::Real: 4953 case UnaryOperator::Imag: 4954 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4955 break; 4956 case UnaryOperator::Extension: 4957 resultType = Input->getType(); 4958 break; 4959 } 4960 if (resultType.isNull()) 4961 return ExprError(); 4962 4963 InputArg.release(); 4964 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4965} 4966 4967// Unary Operators. 'Tok' is the token for the operator. 4968Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4969 tok::TokenKind Op, ExprArg input) { 4970 Expr *Input = (Expr*)input.get(); 4971 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4972 4973 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4974 // Find all of the overloaded operators visible from this 4975 // point. We perform both an operator-name lookup from the local 4976 // scope and an argument-dependent lookup based on the types of 4977 // the arguments. 4978 FunctionSet Functions; 4979 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4980 if (OverOp != OO_None) { 4981 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4982 Functions); 4983 DeclarationName OpName 4984 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4985 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4986 } 4987 4988 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4989 } 4990 4991 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4992} 4993 4994/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4995Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4996 SourceLocation LabLoc, 4997 IdentifierInfo *LabelII) { 4998 // Look up the record for this label identifier. 4999 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5000 5001 // If we haven't seen this label yet, create a forward reference. It 5002 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5003 if (LabelDecl == 0) 5004 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5005 5006 // Create the AST node. The address of a label always has type 'void*'. 5007 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5008 Context.getPointerType(Context.VoidTy))); 5009} 5010 5011Sema::OwningExprResult 5012Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5013 SourceLocation RPLoc) { // "({..})" 5014 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5015 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5016 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5017 5018 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5019 if (isFileScope) 5020 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5021 5022 // FIXME: there are a variety of strange constraints to enforce here, for 5023 // example, it is not possible to goto into a stmt expression apparently. 5024 // More semantic analysis is needed. 5025 5026 // If there are sub stmts in the compound stmt, take the type of the last one 5027 // as the type of the stmtexpr. 5028 QualType Ty = Context.VoidTy; 5029 5030 if (!Compound->body_empty()) { 5031 Stmt *LastStmt = Compound->body_back(); 5032 // If LastStmt is a label, skip down through into the body. 5033 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5034 LastStmt = Label->getSubStmt(); 5035 5036 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5037 Ty = LastExpr->getType(); 5038 } 5039 5040 // FIXME: Check that expression type is complete/non-abstract; statement 5041 // expressions are not lvalues. 5042 5043 substmt.release(); 5044 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5045} 5046 5047Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5048 SourceLocation BuiltinLoc, 5049 SourceLocation TypeLoc, 5050 TypeTy *argty, 5051 OffsetOfComponent *CompPtr, 5052 unsigned NumComponents, 5053 SourceLocation RPLoc) { 5054 // FIXME: This function leaks all expressions in the offset components on 5055 // error. 5056 QualType ArgTy = QualType::getFromOpaquePtr(argty); 5057 assert(!ArgTy.isNull() && "Missing type argument!"); 5058 5059 bool Dependent = ArgTy->isDependentType(); 5060 5061 // We must have at least one component that refers to the type, and the first 5062 // one is known to be a field designator. Verify that the ArgTy represents 5063 // a struct/union/class. 5064 if (!Dependent && !ArgTy->isRecordType()) 5065 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5066 5067 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5068 // with an incomplete type would be illegal. 5069 5070 // Otherwise, create a null pointer as the base, and iteratively process 5071 // the offsetof designators. 5072 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5073 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5074 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5075 ArgTy, SourceLocation()); 5076 5077 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5078 // GCC extension, diagnose them. 5079 // FIXME: This diagnostic isn't actually visible because the location is in 5080 // a system header! 5081 if (NumComponents != 1) 5082 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5083 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5084 5085 if (!Dependent) { 5086 bool DidWarnAboutNonPOD = false; 5087 5088 // FIXME: Dependent case loses a lot of information here. And probably 5089 // leaks like a sieve. 5090 for (unsigned i = 0; i != NumComponents; ++i) { 5091 const OffsetOfComponent &OC = CompPtr[i]; 5092 if (OC.isBrackets) { 5093 // Offset of an array sub-field. TODO: Should we allow vector elements? 5094 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5095 if (!AT) { 5096 Res->Destroy(Context); 5097 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5098 << Res->getType()); 5099 } 5100 5101 // FIXME: C++: Verify that operator[] isn't overloaded. 5102 5103 // Promote the array so it looks more like a normal array subscript 5104 // expression. 5105 DefaultFunctionArrayConversion(Res); 5106 5107 // C99 6.5.2.1p1 5108 Expr *Idx = static_cast<Expr*>(OC.U.E); 5109 // FIXME: Leaks Res 5110 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5111 return ExprError(Diag(Idx->getLocStart(), 5112 diag::err_typecheck_subscript_not_integer) 5113 << Idx->getSourceRange()); 5114 5115 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5116 OC.LocEnd); 5117 continue; 5118 } 5119 5120 const RecordType *RC = Res->getType()->getAsRecordType(); 5121 if (!RC) { 5122 Res->Destroy(Context); 5123 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5124 << Res->getType()); 5125 } 5126 5127 // Get the decl corresponding to this. 5128 RecordDecl *RD = RC->getDecl(); 5129 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5130 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5131 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5132 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5133 << Res->getType()); 5134 DidWarnAboutNonPOD = true; 5135 } 5136 } 5137 5138 FieldDecl *MemberDecl 5139 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5140 LookupMemberName) 5141 .getAsDecl()); 5142 // FIXME: Leaks Res 5143 if (!MemberDecl) 5144 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5145 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5146 5147 // FIXME: C++: Verify that MemberDecl isn't a static field. 5148 // FIXME: Verify that MemberDecl isn't a bitfield. 5149 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5150 Res = BuildAnonymousStructUnionMemberReference( 5151 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5152 } else { 5153 // MemberDecl->getType() doesn't get the right qualifiers, but it 5154 // doesn't matter here. 5155 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5156 MemberDecl->getType().getNonReferenceType()); 5157 } 5158 } 5159 } 5160 5161 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5162 Context.getSizeType(), BuiltinLoc)); 5163} 5164 5165 5166Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5167 TypeTy *arg1,TypeTy *arg2, 5168 SourceLocation RPLoc) { 5169 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5170 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5171 5172 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5173 5174 if (getLangOptions().CPlusPlus) { 5175 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5176 << SourceRange(BuiltinLoc, RPLoc); 5177 return ExprError(); 5178 } 5179 5180 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5181 argT1, argT2, RPLoc)); 5182} 5183 5184Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5185 ExprArg cond, 5186 ExprArg expr1, ExprArg expr2, 5187 SourceLocation RPLoc) { 5188 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5189 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5190 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5191 5192 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5193 5194 QualType resType; 5195 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5196 resType = Context.DependentTy; 5197 } else { 5198 // The conditional expression is required to be a constant expression. 5199 llvm::APSInt condEval(32); 5200 SourceLocation ExpLoc; 5201 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5202 return ExprError(Diag(ExpLoc, 5203 diag::err_typecheck_choose_expr_requires_constant) 5204 << CondExpr->getSourceRange()); 5205 5206 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5207 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5208 } 5209 5210 cond.release(); expr1.release(); expr2.release(); 5211 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5212 resType, RPLoc)); 5213} 5214 5215//===----------------------------------------------------------------------===// 5216// Clang Extensions. 5217//===----------------------------------------------------------------------===// 5218 5219/// ActOnBlockStart - This callback is invoked when a block literal is started. 5220void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5221 // Analyze block parameters. 5222 BlockSemaInfo *BSI = new BlockSemaInfo(); 5223 5224 // Add BSI to CurBlock. 5225 BSI->PrevBlockInfo = CurBlock; 5226 CurBlock = BSI; 5227 5228 BSI->ReturnType = QualType(); 5229 BSI->TheScope = BlockScope; 5230 BSI->hasBlockDeclRefExprs = false; 5231 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5232 CurFunctionNeedsScopeChecking = false; 5233 5234 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5235 PushDeclContext(BlockScope, BSI->TheDecl); 5236} 5237 5238void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5239 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5240 5241 if (ParamInfo.getNumTypeObjects() == 0 5242 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5243 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5244 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5245 5246 if (T->isArrayType()) { 5247 Diag(ParamInfo.getSourceRange().getBegin(), 5248 diag::err_block_returns_array); 5249 return; 5250 } 5251 5252 // The parameter list is optional, if there was none, assume (). 5253 if (!T->isFunctionType()) 5254 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5255 5256 CurBlock->hasPrototype = true; 5257 CurBlock->isVariadic = false; 5258 // Check for a valid sentinel attribute on this block. 5259 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5260 Diag(ParamInfo.getAttributes()->getLoc(), 5261 diag::warn_attribute_sentinel_not_variadic) << 1; 5262 // FIXME: remove the attribute. 5263 } 5264 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5265 5266 // Do not allow returning a objc interface by-value. 5267 if (RetTy->isObjCInterfaceType()) { 5268 Diag(ParamInfo.getSourceRange().getBegin(), 5269 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5270 return; 5271 } 5272 return; 5273 } 5274 5275 // Analyze arguments to block. 5276 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5277 "Not a function declarator!"); 5278 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5279 5280 CurBlock->hasPrototype = FTI.hasPrototype; 5281 CurBlock->isVariadic = true; 5282 5283 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5284 // no arguments, not a function that takes a single void argument. 5285 if (FTI.hasPrototype && 5286 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5287 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5288 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5289 // empty arg list, don't push any params. 5290 CurBlock->isVariadic = false; 5291 } else if (FTI.hasPrototype) { 5292 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5293 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5294 CurBlock->isVariadic = FTI.isVariadic; 5295 } 5296 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5297 CurBlock->Params.size()); 5298 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5299 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5300 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5301 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5302 // If this has an identifier, add it to the scope stack. 5303 if ((*AI)->getIdentifier()) 5304 PushOnScopeChains(*AI, CurBlock->TheScope); 5305 5306 // Check for a valid sentinel attribute on this block. 5307 if (!CurBlock->isVariadic && 5308 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5309 Diag(ParamInfo.getAttributes()->getLoc(), 5310 diag::warn_attribute_sentinel_not_variadic) << 1; 5311 // FIXME: remove the attribute. 5312 } 5313 5314 // Analyze the return type. 5315 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5316 QualType RetTy = T->getAsFunctionType()->getResultType(); 5317 5318 // Do not allow returning a objc interface by-value. 5319 if (RetTy->isObjCInterfaceType()) { 5320 Diag(ParamInfo.getSourceRange().getBegin(), 5321 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5322 } else if (!RetTy->isDependentType()) 5323 CurBlock->ReturnType = RetTy; 5324} 5325 5326/// ActOnBlockError - If there is an error parsing a block, this callback 5327/// is invoked to pop the information about the block from the action impl. 5328void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5329 // Ensure that CurBlock is deleted. 5330 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5331 5332 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5333 5334 // Pop off CurBlock, handle nested blocks. 5335 PopDeclContext(); 5336 CurBlock = CurBlock->PrevBlockInfo; 5337 // FIXME: Delete the ParmVarDecl objects as well??? 5338} 5339 5340/// ActOnBlockStmtExpr - This is called when the body of a block statement 5341/// literal was successfully completed. ^(int x){...} 5342Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5343 StmtArg body, Scope *CurScope) { 5344 // If blocks are disabled, emit an error. 5345 if (!LangOpts.Blocks) 5346 Diag(CaretLoc, diag::err_blocks_disable); 5347 5348 // Ensure that CurBlock is deleted. 5349 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5350 5351 PopDeclContext(); 5352 5353 // Pop off CurBlock, handle nested blocks. 5354 CurBlock = CurBlock->PrevBlockInfo; 5355 5356 QualType RetTy = Context.VoidTy; 5357 if (!BSI->ReturnType.isNull()) 5358 RetTy = BSI->ReturnType; 5359 5360 llvm::SmallVector<QualType, 8> ArgTypes; 5361 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5362 ArgTypes.push_back(BSI->Params[i]->getType()); 5363 5364 QualType BlockTy; 5365 if (!BSI->hasPrototype) 5366 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0); 5367 else 5368 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5369 BSI->isVariadic, 0); 5370 5371 // FIXME: Check that return/parameter types are complete/non-abstract 5372 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5373 BlockTy = Context.getBlockPointerType(BlockTy); 5374 5375 // If needed, diagnose invalid gotos and switches in the block. 5376 if (CurFunctionNeedsScopeChecking) 5377 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5378 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5379 5380 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5381 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5382 BSI->hasBlockDeclRefExprs)); 5383} 5384 5385Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5386 ExprArg expr, TypeTy *type, 5387 SourceLocation RPLoc) { 5388 QualType T = QualType::getFromOpaquePtr(type); 5389 Expr *E = static_cast<Expr*>(expr.get()); 5390 Expr *OrigExpr = E; 5391 5392 InitBuiltinVaListType(); 5393 5394 // Get the va_list type 5395 QualType VaListType = Context.getBuiltinVaListType(); 5396 if (VaListType->isArrayType()) { 5397 // Deal with implicit array decay; for example, on x86-64, 5398 // va_list is an array, but it's supposed to decay to 5399 // a pointer for va_arg. 5400 VaListType = Context.getArrayDecayedType(VaListType); 5401 // Make sure the input expression also decays appropriately. 5402 UsualUnaryConversions(E); 5403 } else { 5404 // Otherwise, the va_list argument must be an l-value because 5405 // it is modified by va_arg. 5406 if (!E->isTypeDependent() && 5407 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5408 return ExprError(); 5409 } 5410 5411 if (!E->isTypeDependent() && 5412 !Context.hasSameType(VaListType, E->getType())) { 5413 return ExprError(Diag(E->getLocStart(), 5414 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5415 << OrigExpr->getType() << E->getSourceRange()); 5416 } 5417 5418 // FIXME: Check that type is complete/non-abstract 5419 // FIXME: Warn if a non-POD type is passed in. 5420 5421 expr.release(); 5422 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5423 RPLoc)); 5424} 5425 5426Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5427 // The type of __null will be int or long, depending on the size of 5428 // pointers on the target. 5429 QualType Ty; 5430 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5431 Ty = Context.IntTy; 5432 else 5433 Ty = Context.LongTy; 5434 5435 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5436} 5437 5438bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5439 SourceLocation Loc, 5440 QualType DstType, QualType SrcType, 5441 Expr *SrcExpr, const char *Flavor) { 5442 // Decode the result (notice that AST's are still created for extensions). 5443 bool isInvalid = false; 5444 unsigned DiagKind; 5445 switch (ConvTy) { 5446 default: assert(0 && "Unknown conversion type"); 5447 case Compatible: return false; 5448 case PointerToInt: 5449 DiagKind = diag::ext_typecheck_convert_pointer_int; 5450 break; 5451 case IntToPointer: 5452 DiagKind = diag::ext_typecheck_convert_int_pointer; 5453 break; 5454 case IncompatiblePointer: 5455 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5456 break; 5457 case IncompatiblePointerSign: 5458 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5459 break; 5460 case FunctionVoidPointer: 5461 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5462 break; 5463 case CompatiblePointerDiscardsQualifiers: 5464 // If the qualifiers lost were because we were applying the 5465 // (deprecated) C++ conversion from a string literal to a char* 5466 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5467 // Ideally, this check would be performed in 5468 // CheckPointerTypesForAssignment. However, that would require a 5469 // bit of refactoring (so that the second argument is an 5470 // expression, rather than a type), which should be done as part 5471 // of a larger effort to fix CheckPointerTypesForAssignment for 5472 // C++ semantics. 5473 if (getLangOptions().CPlusPlus && 5474 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5475 return false; 5476 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5477 break; 5478 case IntToBlockPointer: 5479 DiagKind = diag::err_int_to_block_pointer; 5480 break; 5481 case IncompatibleBlockPointer: 5482 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5483 break; 5484 case IncompatibleObjCQualifiedId: 5485 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5486 // it can give a more specific diagnostic. 5487 DiagKind = diag::warn_incompatible_qualified_id; 5488 break; 5489 case IncompatibleVectors: 5490 DiagKind = diag::warn_incompatible_vectors; 5491 break; 5492 case Incompatible: 5493 DiagKind = diag::err_typecheck_convert_incompatible; 5494 isInvalid = true; 5495 break; 5496 } 5497 5498 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5499 << SrcExpr->getSourceRange(); 5500 return isInvalid; 5501} 5502 5503bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5504 llvm::APSInt ICEResult; 5505 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5506 if (Result) 5507 *Result = ICEResult; 5508 return false; 5509 } 5510 5511 Expr::EvalResult EvalResult; 5512 5513 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5514 EvalResult.HasSideEffects) { 5515 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5516 5517 if (EvalResult.Diag) { 5518 // We only show the note if it's not the usual "invalid subexpression" 5519 // or if it's actually in a subexpression. 5520 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5521 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5522 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5523 } 5524 5525 return true; 5526 } 5527 5528 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5529 E->getSourceRange(); 5530 5531 if (EvalResult.Diag && 5532 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5533 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5534 5535 if (Result) 5536 *Result = EvalResult.Val.getInt(); 5537 return false; 5538} 5539 5540Sema::ExpressionEvaluationContext 5541Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5542 // Introduce a new set of potentially referenced declarations to the stack. 5543 if (NewContext == PotentiallyPotentiallyEvaluated) 5544 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5545 5546 std::swap(ExprEvalContext, NewContext); 5547 return NewContext; 5548} 5549 5550void 5551Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5552 ExpressionEvaluationContext NewContext) { 5553 ExprEvalContext = NewContext; 5554 5555 if (OldContext == PotentiallyPotentiallyEvaluated) { 5556 // Mark any remaining declarations in the current position of the stack 5557 // as "referenced". If they were not meant to be referenced, semantic 5558 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5559 PotentiallyReferencedDecls RemainingDecls; 5560 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5561 PotentiallyReferencedDeclStack.pop_back(); 5562 5563 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5564 IEnd = RemainingDecls.end(); 5565 I != IEnd; ++I) 5566 MarkDeclarationReferenced(I->first, I->second); 5567 } 5568} 5569 5570/// \brief Note that the given declaration was referenced in the source code. 5571/// 5572/// This routine should be invoke whenever a given declaration is referenced 5573/// in the source code, and where that reference occurred. If this declaration 5574/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5575/// C99 6.9p3), then the declaration will be marked as used. 5576/// 5577/// \param Loc the location where the declaration was referenced. 5578/// 5579/// \param D the declaration that has been referenced by the source code. 5580void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5581 assert(D && "No declaration?"); 5582 5583 if (D->isUsed()) 5584 return; 5585 5586 // Mark a parameter declaration "used", regardless of whether we're in a 5587 // template or not. 5588 if (isa<ParmVarDecl>(D)) 5589 D->setUsed(true); 5590 5591 // Do not mark anything as "used" within a dependent context; wait for 5592 // an instantiation. 5593 if (CurContext->isDependentContext()) 5594 return; 5595 5596 switch (ExprEvalContext) { 5597 case Unevaluated: 5598 // We are in an expression that is not potentially evaluated; do nothing. 5599 return; 5600 5601 case PotentiallyEvaluated: 5602 // We are in a potentially-evaluated expression, so this declaration is 5603 // "used"; handle this below. 5604 break; 5605 5606 case PotentiallyPotentiallyEvaluated: 5607 // We are in an expression that may be potentially evaluated; queue this 5608 // declaration reference until we know whether the expression is 5609 // potentially evaluated. 5610 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5611 return; 5612 } 5613 5614 // Note that this declaration has been used. 5615 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5616 unsigned TypeQuals; 5617 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5618 if (!Constructor->isUsed()) 5619 DefineImplicitDefaultConstructor(Loc, Constructor); 5620 } 5621 else if (Constructor->isImplicit() && 5622 Constructor->isCopyConstructor(Context, TypeQuals)) { 5623 if (!Constructor->isUsed()) 5624 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5625 } 5626 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 5627 if (Destructor->isImplicit() && !Destructor->isUsed()) 5628 DefineImplicitDestructor(Loc, Destructor); 5629 5630 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 5631 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 5632 MethodDecl->getOverloadedOperator() == OO_Equal) { 5633 if (!MethodDecl->isUsed()) 5634 DefineImplicitOverloadedAssign(Loc, MethodDecl); 5635 } 5636 } 5637 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5638 // Implicit instantiation of function templates and member functions of 5639 // class templates. 5640 if (!Function->getBody()) { 5641 // FIXME: distinguish between implicit instantiations of function 5642 // templates and explicit specializations (the latter don't get 5643 // instantiated, naturally). 5644 if (Function->getInstantiatedFromMemberFunction() || 5645 Function->getPrimaryTemplate()) 5646 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 5647 } 5648 5649 5650 // FIXME: keep track of references to static functions 5651 Function->setUsed(true); 5652 return; 5653 } 5654 5655 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5656 (void)Var; 5657 // FIXME: implicit template instantiation 5658 // FIXME: keep track of references to static data? 5659 D->setUsed(true); 5660 } 5661} 5662 5663