SemaExpr.cpp revision 98a541e80848d3b7d1131237ac04e698faffd151
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 unsigned BaseAddrSpace = BaseObjectExpr->getType().getAddressSpace(); 798 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 799 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 800 FI != FIEnd; ++FI) { 801 QualType MemberType = (*FI)->getType(); 802 if (!(*FI)->isMutable()) { 803 unsigned combinedQualifiers 804 = MemberType.getCVRQualifiers() | ExtraQuals; 805 MemberType = MemberType.getQualifiedType(combinedQualifiers); 806 } 807 if (BaseAddrSpace != MemberType.getAddressSpace()) 808 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 809 MarkDeclarationReferenced(Loc, *FI); 810 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 811 OpLoc, MemberType); 812 BaseObjectIsPointer = false; 813 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 814 } 815 816 return Owned(Result); 817} 818 819/// ActOnDeclarationNameExpr - The parser has read some kind of name 820/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 821/// performs lookup on that name and returns an expression that refers 822/// to that name. This routine isn't directly called from the parser, 823/// because the parser doesn't know about DeclarationName. Rather, 824/// this routine is called by ActOnIdentifierExpr, 825/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 826/// which form the DeclarationName from the corresponding syntactic 827/// forms. 828/// 829/// HasTrailingLParen indicates whether this identifier is used in a 830/// function call context. LookupCtx is only used for a C++ 831/// qualified-id (foo::bar) to indicate the class or namespace that 832/// the identifier must be a member of. 833/// 834/// isAddressOfOperand means that this expression is the direct operand 835/// of an address-of operator. This matters because this is the only 836/// situation where a qualified name referencing a non-static member may 837/// appear outside a member function of this class. 838Sema::OwningExprResult 839Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 840 DeclarationName Name, bool HasTrailingLParen, 841 const CXXScopeSpec *SS, 842 bool isAddressOfOperand) { 843 // Could be enum-constant, value decl, instance variable, etc. 844 if (SS && SS->isInvalid()) 845 return ExprError(); 846 847 // C++ [temp.dep.expr]p3: 848 // An id-expression is type-dependent if it contains: 849 // -- a nested-name-specifier that contains a class-name that 850 // names a dependent type. 851 // FIXME: Member of the current instantiation. 852 if (SS && isDependentScopeSpecifier(*SS)) { 853 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 854 Loc, SS->getRange(), 855 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 856 isAddressOfOperand)); 857 } 858 859 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 860 false, true, Loc); 861 862 if (Lookup.isAmbiguous()) { 863 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 864 SS && SS->isSet() ? SS->getRange() 865 : SourceRange()); 866 return ExprError(); 867 } 868 869 NamedDecl *D = Lookup.getAsDecl(); 870 871 // If this reference is in an Objective-C method, then ivar lookup happens as 872 // well. 873 IdentifierInfo *II = Name.getAsIdentifierInfo(); 874 if (II && getCurMethodDecl()) { 875 // There are two cases to handle here. 1) scoped lookup could have failed, 876 // in which case we should look for an ivar. 2) scoped lookup could have 877 // found a decl, but that decl is outside the current instance method (i.e. 878 // a global variable). In these two cases, we do a lookup for an ivar with 879 // this name, if the lookup sucedes, we replace it our current decl. 880 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 881 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 882 ObjCInterfaceDecl *ClassDeclared; 883 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 884 // Check if referencing a field with __attribute__((deprecated)). 885 if (DiagnoseUseOfDecl(IV, Loc)) 886 return ExprError(); 887 888 // If we're referencing an invalid decl, just return this as a silent 889 // error node. The error diagnostic was already emitted on the decl. 890 if (IV->isInvalidDecl()) 891 return ExprError(); 892 893 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 894 // If a class method attemps to use a free standing ivar, this is 895 // an error. 896 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 897 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 898 << IV->getDeclName()); 899 // If a class method uses a global variable, even if an ivar with 900 // same name exists, use the global. 901 if (!IsClsMethod) { 902 if (IV->getAccessControl() == ObjCIvarDecl::Private && 903 ClassDeclared != IFace) 904 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 905 // FIXME: This should use a new expr for a direct reference, don't 906 // turn this into Self->ivar, just return a BareIVarExpr or something. 907 IdentifierInfo &II = Context.Idents.get("self"); 908 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, SourceLocation(), 909 II, false); 910 MarkDeclarationReferenced(Loc, IV); 911 return Owned(new (Context) 912 ObjCIvarRefExpr(IV, IV->getType(), Loc, 913 SelfExpr.takeAs<Expr>(), true, true)); 914 } 915 } 916 } 917 else if (getCurMethodDecl()->isInstanceMethod()) { 918 // We should warn if a local variable hides an ivar. 919 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 920 ObjCInterfaceDecl *ClassDeclared; 921 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 922 if (IV->getAccessControl() != ObjCIvarDecl::Private || 923 IFace == ClassDeclared) 924 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 925 } 926 } 927 // Needed to implement property "super.method" notation. 928 if (D == 0 && II->isStr("super")) { 929 QualType T; 930 931 if (getCurMethodDecl()->isInstanceMethod()) 932 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 933 getCurMethodDecl()->getClassInterface())); 934 else 935 T = Context.getObjCClassType(); 936 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 937 } 938 } 939 940 // Determine whether this name might be a candidate for 941 // argument-dependent lookup. 942 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 943 HasTrailingLParen; 944 945 if (ADL && D == 0) { 946 // We've seen something of the form 947 // 948 // identifier( 949 // 950 // and we did not find any entity by the name 951 // "identifier". However, this identifier is still subject to 952 // argument-dependent lookup, so keep track of the name. 953 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 954 Context.OverloadTy, 955 Loc)); 956 } 957 958 if (D == 0) { 959 // Otherwise, this could be an implicitly declared function reference (legal 960 // in C90, extension in C99). 961 if (HasTrailingLParen && II && 962 !getLangOptions().CPlusPlus) // Not in C++. 963 D = ImplicitlyDefineFunction(Loc, *II, S); 964 else { 965 // If this name wasn't predeclared and if this is not a function call, 966 // diagnose the problem. 967 if (SS && !SS->isEmpty()) 968 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 969 << Name << SS->getRange()); 970 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 971 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 972 return ExprError(Diag(Loc, diag::err_undeclared_use) 973 << Name.getAsString()); 974 else 975 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 976 } 977 } 978 979 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 980 // Warn about constructs like: 981 // if (void *X = foo()) { ... } else { X }. 982 // In the else block, the pointer is always false. 983 984 // FIXME: In a template instantiation, we don't have scope 985 // information to check this property. 986 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 987 Scope *CheckS = S; 988 while (CheckS) { 989 if (CheckS->isWithinElse() && 990 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 991 if (Var->getType()->isBooleanType()) 992 ExprError(Diag(Loc, diag::warn_value_always_false) 993 << Var->getDeclName()); 994 else 995 ExprError(Diag(Loc, diag::warn_value_always_zero) 996 << Var->getDeclName()); 997 break; 998 } 999 1000 // Move up one more control parent to check again. 1001 CheckS = CheckS->getControlParent(); 1002 if (CheckS) 1003 CheckS = CheckS->getParent(); 1004 } 1005 } 1006 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 1007 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 1008 // C99 DR 316 says that, if a function type comes from a 1009 // function definition (without a prototype), that type is only 1010 // used for checking compatibility. Therefore, when referencing 1011 // the function, we pretend that we don't have the full function 1012 // type. 1013 if (DiagnoseUseOfDecl(Func, Loc)) 1014 return ExprError(); 1015 1016 QualType T = Func->getType(); 1017 QualType NoProtoType = T; 1018 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 1019 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 1020 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 1021 } 1022 } 1023 1024 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 1025} 1026/// \brief Cast member's object to its own class if necessary. 1027void 1028Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 1029 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 1030 if (CXXRecordDecl *RD = 1031 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 1032 QualType DestType = 1033 Context.getCanonicalType(Context.getTypeDeclType(RD)); 1034 if (!DestType->isDependentType() && 1035 !From->getType()->isDependentType()) { 1036 if (From->getType()->getAsPointerType()) 1037 DestType = Context.getPointerType(DestType); 1038 ImpCastExprToType(From, DestType, /*isLvalue=*/true); 1039 } 1040 } 1041} 1042 1043/// \brief Complete semantic analysis for a reference to the given declaration. 1044Sema::OwningExprResult 1045Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 1046 bool HasTrailingLParen, 1047 const CXXScopeSpec *SS, 1048 bool isAddressOfOperand) { 1049 assert(D && "Cannot refer to a NULL declaration"); 1050 DeclarationName Name = D->getDeclName(); 1051 1052 // If this is an expression of the form &Class::member, don't build an 1053 // implicit member ref, because we want a pointer to the member in general, 1054 // not any specific instance's member. 1055 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 1056 DeclContext *DC = computeDeclContext(*SS); 1057 if (D && isa<CXXRecordDecl>(DC)) { 1058 QualType DType; 1059 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1060 DType = FD->getType().getNonReferenceType(); 1061 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1062 DType = Method->getType(); 1063 } else if (isa<OverloadedFunctionDecl>(D)) { 1064 DType = Context.OverloadTy; 1065 } 1066 // Could be an inner type. That's diagnosed below, so ignore it here. 1067 if (!DType.isNull()) { 1068 // The pointer is type- and value-dependent if it points into something 1069 // dependent. 1070 bool Dependent = DC->isDependentContext(); 1071 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 1072 } 1073 } 1074 } 1075 1076 // We may have found a field within an anonymous union or struct 1077 // (C++ [class.union]). 1078 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 1079 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1080 return BuildAnonymousStructUnionMemberReference(Loc, FD); 1081 1082 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1083 if (!MD->isStatic()) { 1084 // C++ [class.mfct.nonstatic]p2: 1085 // [...] if name lookup (3.4.1) resolves the name in the 1086 // id-expression to a nonstatic nontype member of class X or of 1087 // a base class of X, the id-expression is transformed into a 1088 // class member access expression (5.2.5) using (*this) (9.3.2) 1089 // as the postfix-expression to the left of the '.' operator. 1090 DeclContext *Ctx = 0; 1091 QualType MemberType; 1092 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1093 Ctx = FD->getDeclContext(); 1094 MemberType = FD->getType(); 1095 1096 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 1097 MemberType = RefType->getPointeeType(); 1098 else if (!FD->isMutable()) { 1099 unsigned combinedQualifiers 1100 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 1101 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1102 } 1103 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 1104 if (!Method->isStatic()) { 1105 Ctx = Method->getParent(); 1106 MemberType = Method->getType(); 1107 } 1108 } else if (OverloadedFunctionDecl *Ovl 1109 = dyn_cast<OverloadedFunctionDecl>(D)) { 1110 for (OverloadedFunctionDecl::function_iterator 1111 Func = Ovl->function_begin(), 1112 FuncEnd = Ovl->function_end(); 1113 Func != FuncEnd; ++Func) { 1114 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 1115 if (!DMethod->isStatic()) { 1116 Ctx = Ovl->getDeclContext(); 1117 MemberType = Context.OverloadTy; 1118 break; 1119 } 1120 } 1121 } 1122 1123 if (Ctx && Ctx->isRecord()) { 1124 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 1125 QualType ThisType = Context.getTagDeclType(MD->getParent()); 1126 if ((Context.getCanonicalType(CtxType) 1127 == Context.getCanonicalType(ThisType)) || 1128 IsDerivedFrom(ThisType, CtxType)) { 1129 // Build the implicit member access expression. 1130 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 1131 MD->getThisType(Context)); 1132 MarkDeclarationReferenced(Loc, D); 1133 PerformObjectMemberConversion(This, D); 1134 return Owned(new (Context) MemberExpr(This, true, D, 1135 Loc, MemberType)); 1136 } 1137 } 1138 } 1139 } 1140 1141 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 1142 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 1143 if (MD->isStatic()) 1144 // "invalid use of member 'x' in static member function" 1145 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 1146 << FD->getDeclName()); 1147 } 1148 1149 // Any other ways we could have found the field in a well-formed 1150 // program would have been turned into implicit member expressions 1151 // above. 1152 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 1153 << FD->getDeclName()); 1154 } 1155 1156 if (isa<TypedefDecl>(D)) 1157 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 1158 if (isa<ObjCInterfaceDecl>(D)) 1159 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 1160 if (isa<NamespaceDecl>(D)) 1161 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 1162 1163 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 1164 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 1165 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 1166 false, false, SS); 1167 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 1168 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 1169 false, false, SS); 1170 ValueDecl *VD = cast<ValueDecl>(D); 1171 1172 // Check whether this declaration can be used. Note that we suppress 1173 // this check when we're going to perform argument-dependent lookup 1174 // on this function name, because this might not be the function 1175 // that overload resolution actually selects. 1176 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1177 HasTrailingLParen; 1178 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1179 return ExprError(); 1180 1181 // Only create DeclRefExpr's for valid Decl's. 1182 if (VD->isInvalidDecl()) 1183 return ExprError(); 1184 1185 // If the identifier reference is inside a block, and it refers to a value 1186 // that is outside the block, create a BlockDeclRefExpr instead of a 1187 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1188 // the block is formed. 1189 // 1190 // We do not do this for things like enum constants, global variables, etc, 1191 // as they do not get snapshotted. 1192 // 1193 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1194 MarkDeclarationReferenced(Loc, VD); 1195 QualType ExprTy = VD->getType().getNonReferenceType(); 1196 // The BlocksAttr indicates the variable is bound by-reference. 1197 if (VD->getAttr<BlocksAttr>()) 1198 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1199 // This is to record that a 'const' was actually synthesize and added. 1200 bool constAdded = !ExprTy.isConstQualified(); 1201 // Variable will be bound by-copy, make it const within the closure. 1202 1203 ExprTy.addConst(); 1204 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1205 constAdded)); 1206 } 1207 // If this reference is not in a block or if the referenced variable is 1208 // within the block, create a normal DeclRefExpr. 1209 1210 bool TypeDependent = false; 1211 bool ValueDependent = false; 1212 if (getLangOptions().CPlusPlus) { 1213 // C++ [temp.dep.expr]p3: 1214 // An id-expression is type-dependent if it contains: 1215 // - an identifier that was declared with a dependent type, 1216 if (VD->getType()->isDependentType()) 1217 TypeDependent = true; 1218 // - FIXME: a template-id that is dependent, 1219 // - a conversion-function-id that specifies a dependent type, 1220 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1221 Name.getCXXNameType()->isDependentType()) 1222 TypeDependent = true; 1223 // - a nested-name-specifier that contains a class-name that 1224 // names a dependent type. 1225 else if (SS && !SS->isEmpty()) { 1226 for (DeclContext *DC = computeDeclContext(*SS); 1227 DC; DC = DC->getParent()) { 1228 // FIXME: could stop early at namespace scope. 1229 if (DC->isRecord()) { 1230 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1231 if (Context.getTypeDeclType(Record)->isDependentType()) { 1232 TypeDependent = true; 1233 break; 1234 } 1235 } 1236 } 1237 } 1238 1239 // C++ [temp.dep.constexpr]p2: 1240 // 1241 // An identifier is value-dependent if it is: 1242 // - a name declared with a dependent type, 1243 if (TypeDependent) 1244 ValueDependent = true; 1245 // - the name of a non-type template parameter, 1246 else if (isa<NonTypeTemplateParmDecl>(VD)) 1247 ValueDependent = true; 1248 // - a constant with integral or enumeration type and is 1249 // initialized with an expression that is value-dependent 1250 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1251 if (Dcl->getType().getCVRQualifiers() == QualType::Const && 1252 Dcl->getInit()) { 1253 ValueDependent = Dcl->getInit()->isValueDependent(); 1254 } 1255 } 1256 } 1257 1258 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1259 TypeDependent, ValueDependent, SS); 1260} 1261 1262Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1263 tok::TokenKind Kind) { 1264 PredefinedExpr::IdentType IT; 1265 1266 switch (Kind) { 1267 default: assert(0 && "Unknown simple primary expr!"); 1268 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1269 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1270 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1271 } 1272 1273 // Pre-defined identifiers are of type char[x], where x is the length of the 1274 // string. 1275 unsigned Length; 1276 if (FunctionDecl *FD = getCurFunctionDecl()) 1277 Length = FD->getIdentifier()->getLength(); 1278 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1279 Length = MD->getSynthesizedMethodSize(); 1280 else { 1281 Diag(Loc, diag::ext_predef_outside_function); 1282 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1283 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1284 } 1285 1286 1287 llvm::APInt LengthI(32, Length + 1); 1288 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1289 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1290 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1291} 1292 1293Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1294 llvm::SmallString<16> CharBuffer; 1295 CharBuffer.resize(Tok.getLength()); 1296 const char *ThisTokBegin = &CharBuffer[0]; 1297 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1298 1299 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1300 Tok.getLocation(), PP); 1301 if (Literal.hadError()) 1302 return ExprError(); 1303 1304 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1305 1306 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1307 Literal.isWide(), 1308 type, Tok.getLocation())); 1309} 1310 1311Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1312 // Fast path for a single digit (which is quite common). A single digit 1313 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1314 if (Tok.getLength() == 1) { 1315 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1316 unsigned IntSize = Context.Target.getIntWidth(); 1317 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1318 Context.IntTy, Tok.getLocation())); 1319 } 1320 1321 llvm::SmallString<512> IntegerBuffer; 1322 // Add padding so that NumericLiteralParser can overread by one character. 1323 IntegerBuffer.resize(Tok.getLength()+1); 1324 const char *ThisTokBegin = &IntegerBuffer[0]; 1325 1326 // Get the spelling of the token, which eliminates trigraphs, etc. 1327 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1328 1329 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1330 Tok.getLocation(), PP); 1331 if (Literal.hadError) 1332 return ExprError(); 1333 1334 Expr *Res; 1335 1336 if (Literal.isFloatingLiteral()) { 1337 QualType Ty; 1338 if (Literal.isFloat) 1339 Ty = Context.FloatTy; 1340 else if (!Literal.isLong) 1341 Ty = Context.DoubleTy; 1342 else 1343 Ty = Context.LongDoubleTy; 1344 1345 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1346 1347 // isExact will be set by GetFloatValue(). 1348 bool isExact = false; 1349 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1350 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1351 1352 } else if (!Literal.isIntegerLiteral()) { 1353 return ExprError(); 1354 } else { 1355 QualType Ty; 1356 1357 // long long is a C99 feature. 1358 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1359 Literal.isLongLong) 1360 Diag(Tok.getLocation(), diag::ext_longlong); 1361 1362 // Get the value in the widest-possible width. 1363 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1364 1365 if (Literal.GetIntegerValue(ResultVal)) { 1366 // If this value didn't fit into uintmax_t, warn and force to ull. 1367 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1368 Ty = Context.UnsignedLongLongTy; 1369 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1370 "long long is not intmax_t?"); 1371 } else { 1372 // If this value fits into a ULL, try to figure out what else it fits into 1373 // according to the rules of C99 6.4.4.1p5. 1374 1375 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1376 // be an unsigned int. 1377 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1378 1379 // Check from smallest to largest, picking the smallest type we can. 1380 unsigned Width = 0; 1381 if (!Literal.isLong && !Literal.isLongLong) { 1382 // Are int/unsigned possibilities? 1383 unsigned IntSize = Context.Target.getIntWidth(); 1384 1385 // Does it fit in a unsigned int? 1386 if (ResultVal.isIntN(IntSize)) { 1387 // Does it fit in a signed int? 1388 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1389 Ty = Context.IntTy; 1390 else if (AllowUnsigned) 1391 Ty = Context.UnsignedIntTy; 1392 Width = IntSize; 1393 } 1394 } 1395 1396 // Are long/unsigned long possibilities? 1397 if (Ty.isNull() && !Literal.isLongLong) { 1398 unsigned LongSize = Context.Target.getLongWidth(); 1399 1400 // Does it fit in a unsigned long? 1401 if (ResultVal.isIntN(LongSize)) { 1402 // Does it fit in a signed long? 1403 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1404 Ty = Context.LongTy; 1405 else if (AllowUnsigned) 1406 Ty = Context.UnsignedLongTy; 1407 Width = LongSize; 1408 } 1409 } 1410 1411 // Finally, check long long if needed. 1412 if (Ty.isNull()) { 1413 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1414 1415 // Does it fit in a unsigned long long? 1416 if (ResultVal.isIntN(LongLongSize)) { 1417 // Does it fit in a signed long long? 1418 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1419 Ty = Context.LongLongTy; 1420 else if (AllowUnsigned) 1421 Ty = Context.UnsignedLongLongTy; 1422 Width = LongLongSize; 1423 } 1424 } 1425 1426 // If we still couldn't decide a type, we probably have something that 1427 // does not fit in a signed long long, but has no U suffix. 1428 if (Ty.isNull()) { 1429 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1430 Ty = Context.UnsignedLongLongTy; 1431 Width = Context.Target.getLongLongWidth(); 1432 } 1433 1434 if (ResultVal.getBitWidth() != Width) 1435 ResultVal.trunc(Width); 1436 } 1437 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1438 } 1439 1440 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1441 if (Literal.isImaginary) 1442 Res = new (Context) ImaginaryLiteral(Res, 1443 Context.getComplexType(Res->getType())); 1444 1445 return Owned(Res); 1446} 1447 1448Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1449 SourceLocation R, ExprArg Val) { 1450 Expr *E = Val.takeAs<Expr>(); 1451 assert((E != 0) && "ActOnParenExpr() missing expr"); 1452 return Owned(new (Context) ParenExpr(L, R, E)); 1453} 1454 1455/// The UsualUnaryConversions() function is *not* called by this routine. 1456/// See C99 6.3.2.1p[2-4] for more details. 1457bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1458 SourceLocation OpLoc, 1459 const SourceRange &ExprRange, 1460 bool isSizeof) { 1461 if (exprType->isDependentType()) 1462 return false; 1463 1464 // C99 6.5.3.4p1: 1465 if (isa<FunctionType>(exprType)) { 1466 // alignof(function) is allowed as an extension. 1467 if (isSizeof) 1468 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1469 return false; 1470 } 1471 1472 // Allow sizeof(void)/alignof(void) as an extension. 1473 if (exprType->isVoidType()) { 1474 Diag(OpLoc, diag::ext_sizeof_void_type) 1475 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1476 return false; 1477 } 1478 1479 if (RequireCompleteType(OpLoc, exprType, 1480 isSizeof ? diag::err_sizeof_incomplete_type : 1481 diag::err_alignof_incomplete_type, 1482 ExprRange)) 1483 return true; 1484 1485 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1486 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1487 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1488 << exprType << isSizeof << ExprRange; 1489 return true; 1490 } 1491 1492 return false; 1493} 1494 1495bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1496 const SourceRange &ExprRange) { 1497 E = E->IgnoreParens(); 1498 1499 // alignof decl is always ok. 1500 if (isa<DeclRefExpr>(E)) 1501 return false; 1502 1503 // Cannot know anything else if the expression is dependent. 1504 if (E->isTypeDependent()) 1505 return false; 1506 1507 if (E->getBitField()) { 1508 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1509 return true; 1510 } 1511 1512 // Alignment of a field access is always okay, so long as it isn't a 1513 // bit-field. 1514 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1515 if (isa<FieldDecl>(ME->getMemberDecl())) 1516 return false; 1517 1518 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1519} 1520 1521/// \brief Build a sizeof or alignof expression given a type operand. 1522Action::OwningExprResult 1523Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1524 bool isSizeOf, SourceRange R) { 1525 if (T.isNull()) 1526 return ExprError(); 1527 1528 if (!T->isDependentType() && 1529 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1530 return ExprError(); 1531 1532 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1533 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1534 Context.getSizeType(), OpLoc, 1535 R.getEnd())); 1536} 1537 1538/// \brief Build a sizeof or alignof expression given an expression 1539/// operand. 1540Action::OwningExprResult 1541Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1542 bool isSizeOf, SourceRange R) { 1543 // Verify that the operand is valid. 1544 bool isInvalid = false; 1545 if (E->isTypeDependent()) { 1546 // Delay type-checking for type-dependent expressions. 1547 } else if (!isSizeOf) { 1548 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1549 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1550 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1551 isInvalid = true; 1552 } else { 1553 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1554 } 1555 1556 if (isInvalid) 1557 return ExprError(); 1558 1559 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1560 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1561 Context.getSizeType(), OpLoc, 1562 R.getEnd())); 1563} 1564 1565/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1566/// the same for @c alignof and @c __alignof 1567/// Note that the ArgRange is invalid if isType is false. 1568Action::OwningExprResult 1569Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1570 void *TyOrEx, const SourceRange &ArgRange) { 1571 // If error parsing type, ignore. 1572 if (TyOrEx == 0) return ExprError(); 1573 1574 if (isType) { 1575 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1576 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1577 } 1578 1579 // Get the end location. 1580 Expr *ArgEx = (Expr *)TyOrEx; 1581 Action::OwningExprResult Result 1582 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1583 1584 if (Result.isInvalid()) 1585 DeleteExpr(ArgEx); 1586 1587 return move(Result); 1588} 1589 1590QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1591 if (V->isTypeDependent()) 1592 return Context.DependentTy; 1593 1594 // These operators return the element type of a complex type. 1595 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1596 return CT->getElementType(); 1597 1598 // Otherwise they pass through real integer and floating point types here. 1599 if (V->getType()->isArithmeticType()) 1600 return V->getType(); 1601 1602 // Reject anything else. 1603 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1604 << (isReal ? "__real" : "__imag"); 1605 return QualType(); 1606} 1607 1608 1609 1610Action::OwningExprResult 1611Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1612 tok::TokenKind Kind, ExprArg Input) { 1613 Expr *Arg = (Expr *)Input.get(); 1614 1615 UnaryOperator::Opcode Opc; 1616 switch (Kind) { 1617 default: assert(0 && "Unknown unary op!"); 1618 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1619 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1620 } 1621 1622 if (getLangOptions().CPlusPlus && 1623 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1624 // Which overloaded operator? 1625 OverloadedOperatorKind OverOp = 1626 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1627 1628 // C++ [over.inc]p1: 1629 // 1630 // [...] If the function is a member function with one 1631 // parameter (which shall be of type int) or a non-member 1632 // function with two parameters (the second of which shall be 1633 // of type int), it defines the postfix increment operator ++ 1634 // for objects of that type. When the postfix increment is 1635 // called as a result of using the ++ operator, the int 1636 // argument will have value zero. 1637 Expr *Args[2] = { 1638 Arg, 1639 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1640 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1641 }; 1642 1643 // Build the candidate set for overloading 1644 OverloadCandidateSet CandidateSet; 1645 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1646 1647 // Perform overload resolution. 1648 OverloadCandidateSet::iterator Best; 1649 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1650 case OR_Success: { 1651 // We found a built-in operator or an overloaded operator. 1652 FunctionDecl *FnDecl = Best->Function; 1653 1654 if (FnDecl) { 1655 // We matched an overloaded operator. Build a call to that 1656 // operator. 1657 1658 // Convert the arguments. 1659 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1660 if (PerformObjectArgumentInitialization(Arg, Method)) 1661 return ExprError(); 1662 } else { 1663 // Convert the arguments. 1664 if (PerformCopyInitialization(Arg, 1665 FnDecl->getParamDecl(0)->getType(), 1666 "passing")) 1667 return ExprError(); 1668 } 1669 1670 // Determine the result type 1671 QualType ResultTy 1672 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1673 ResultTy = ResultTy.getNonReferenceType(); 1674 1675 // Build the actual expression node. 1676 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1677 SourceLocation()); 1678 UsualUnaryConversions(FnExpr); 1679 1680 Input.release(); 1681 Args[0] = Arg; 1682 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1683 Args, 2, ResultTy, 1684 OpLoc)); 1685 } else { 1686 // We matched a built-in operator. Convert the arguments, then 1687 // break out so that we will build the appropriate built-in 1688 // operator node. 1689 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1690 "passing")) 1691 return ExprError(); 1692 1693 break; 1694 } 1695 } 1696 1697 case OR_No_Viable_Function: 1698 // No viable function; fall through to handling this as a 1699 // built-in operator, which will produce an error message for us. 1700 break; 1701 1702 case OR_Ambiguous: 1703 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1704 << UnaryOperator::getOpcodeStr(Opc) 1705 << Arg->getSourceRange(); 1706 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1707 return ExprError(); 1708 1709 case OR_Deleted: 1710 Diag(OpLoc, diag::err_ovl_deleted_oper) 1711 << Best->Function->isDeleted() 1712 << UnaryOperator::getOpcodeStr(Opc) 1713 << Arg->getSourceRange(); 1714 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1715 return ExprError(); 1716 } 1717 1718 // Either we found no viable overloaded operator or we matched a 1719 // built-in operator. In either case, fall through to trying to 1720 // build a built-in operation. 1721 } 1722 1723 Input.release(); 1724 Input = Arg; 1725 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1726} 1727 1728Action::OwningExprResult 1729Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1730 ExprArg Idx, SourceLocation RLoc) { 1731 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1732 *RHSExp = static_cast<Expr*>(Idx.get()); 1733 1734 if (getLangOptions().CPlusPlus && 1735 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1736 Base.release(); 1737 Idx.release(); 1738 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1739 Context.DependentTy, RLoc)); 1740 } 1741 1742 if (getLangOptions().CPlusPlus && 1743 (LHSExp->getType()->isRecordType() || 1744 LHSExp->getType()->isEnumeralType() || 1745 RHSExp->getType()->isRecordType() || 1746 RHSExp->getType()->isEnumeralType())) { 1747 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1748 // to the candidate set. 1749 OverloadCandidateSet CandidateSet; 1750 Expr *Args[2] = { LHSExp, RHSExp }; 1751 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1752 SourceRange(LLoc, RLoc)); 1753 1754 // Perform overload resolution. 1755 OverloadCandidateSet::iterator Best; 1756 switch (BestViableFunction(CandidateSet, LLoc, Best)) { 1757 case OR_Success: { 1758 // We found a built-in operator or an overloaded operator. 1759 FunctionDecl *FnDecl = Best->Function; 1760 1761 if (FnDecl) { 1762 // We matched an overloaded operator. Build a call to that 1763 // operator. 1764 1765 // Convert the arguments. 1766 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1767 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1768 PerformCopyInitialization(RHSExp, 1769 FnDecl->getParamDecl(0)->getType(), 1770 "passing")) 1771 return ExprError(); 1772 } else { 1773 // Convert the arguments. 1774 if (PerformCopyInitialization(LHSExp, 1775 FnDecl->getParamDecl(0)->getType(), 1776 "passing") || 1777 PerformCopyInitialization(RHSExp, 1778 FnDecl->getParamDecl(1)->getType(), 1779 "passing")) 1780 return ExprError(); 1781 } 1782 1783 // Determine the result type 1784 QualType ResultTy 1785 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1786 ResultTy = ResultTy.getNonReferenceType(); 1787 1788 // Build the actual expression node. 1789 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1790 SourceLocation()); 1791 UsualUnaryConversions(FnExpr); 1792 1793 Base.release(); 1794 Idx.release(); 1795 Args[0] = LHSExp; 1796 Args[1] = RHSExp; 1797 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1798 FnExpr, Args, 2, 1799 ResultTy, LLoc)); 1800 } else { 1801 // We matched a built-in operator. Convert the arguments, then 1802 // break out so that we will build the appropriate built-in 1803 // operator node. 1804 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1805 "passing") || 1806 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1807 "passing")) 1808 return ExprError(); 1809 1810 break; 1811 } 1812 } 1813 1814 case OR_No_Viable_Function: 1815 // No viable function; fall through to handling this as a 1816 // built-in operator, which will produce an error message for us. 1817 break; 1818 1819 case OR_Ambiguous: 1820 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1821 << "[]" 1822 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1823 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1824 return ExprError(); 1825 1826 case OR_Deleted: 1827 Diag(LLoc, diag::err_ovl_deleted_oper) 1828 << Best->Function->isDeleted() 1829 << "[]" 1830 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1831 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1832 return ExprError(); 1833 } 1834 1835 // Either we found no viable overloaded operator or we matched a 1836 // built-in operator. In either case, fall through to trying to 1837 // build a built-in operation. 1838 } 1839 1840 // Perform default conversions. 1841 DefaultFunctionArrayConversion(LHSExp); 1842 DefaultFunctionArrayConversion(RHSExp); 1843 1844 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1845 1846 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1847 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1848 // in the subscript position. As a result, we need to derive the array base 1849 // and index from the expression types. 1850 Expr *BaseExpr, *IndexExpr; 1851 QualType ResultType; 1852 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1853 BaseExpr = LHSExp; 1854 IndexExpr = RHSExp; 1855 ResultType = Context.DependentTy; 1856 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1857 BaseExpr = LHSExp; 1858 IndexExpr = RHSExp; 1859 ResultType = PTy->getPointeeType(); 1860 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1861 // Handle the uncommon case of "123[Ptr]". 1862 BaseExpr = RHSExp; 1863 IndexExpr = LHSExp; 1864 ResultType = PTy->getPointeeType(); 1865 } else if (const ObjCObjectPointerType *PTy = 1866 LHSTy->getAsObjCObjectPointerType()) { 1867 BaseExpr = LHSExp; 1868 IndexExpr = RHSExp; 1869 ResultType = PTy->getPointeeType(); 1870 } else if (const ObjCObjectPointerType *PTy = 1871 RHSTy->getAsObjCObjectPointerType()) { 1872 // Handle the uncommon case of "123[Ptr]". 1873 BaseExpr = RHSExp; 1874 IndexExpr = LHSExp; 1875 ResultType = PTy->getPointeeType(); 1876 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1877 BaseExpr = LHSExp; // vectors: V[123] 1878 IndexExpr = RHSExp; 1879 1880 // FIXME: need to deal with const... 1881 ResultType = VTy->getElementType(); 1882 } else if (LHSTy->isArrayType()) { 1883 // If we see an array that wasn't promoted by 1884 // DefaultFunctionArrayConversion, it must be an array that 1885 // wasn't promoted because of the C90 rule that doesn't 1886 // allow promoting non-lvalue arrays. Warn, then 1887 // force the promotion here. 1888 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1889 LHSExp->getSourceRange(); 1890 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy)); 1891 LHSTy = LHSExp->getType(); 1892 1893 BaseExpr = LHSExp; 1894 IndexExpr = RHSExp; 1895 ResultType = LHSTy->getAsPointerType()->getPointeeType(); 1896 } else if (RHSTy->isArrayType()) { 1897 // Same as previous, except for 123[f().a] case 1898 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1899 RHSExp->getSourceRange(); 1900 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy)); 1901 RHSTy = RHSExp->getType(); 1902 1903 BaseExpr = RHSExp; 1904 IndexExpr = LHSExp; 1905 ResultType = RHSTy->getAsPointerType()->getPointeeType(); 1906 } else { 1907 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1908 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1909 } 1910 // C99 6.5.2.1p1 1911 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1912 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1913 << IndexExpr->getSourceRange()); 1914 1915 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1916 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1917 // type. Note that Functions are not objects, and that (in C99 parlance) 1918 // incomplete types are not object types. 1919 if (ResultType->isFunctionType()) { 1920 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1921 << ResultType << BaseExpr->getSourceRange(); 1922 return ExprError(); 1923 } 1924 1925 if (!ResultType->isDependentType() && 1926 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1927 BaseExpr->getSourceRange())) 1928 return ExprError(); 1929 1930 // Diagnose bad cases where we step over interface counts. 1931 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1932 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1933 << ResultType << BaseExpr->getSourceRange(); 1934 return ExprError(); 1935 } 1936 1937 Base.release(); 1938 Idx.release(); 1939 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1940 ResultType, RLoc)); 1941} 1942 1943QualType Sema:: 1944CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1945 IdentifierInfo &CompName, SourceLocation CompLoc) { 1946 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1947 1948 // The vector accessor can't exceed the number of elements. 1949 const char *compStr = CompName.getName(); 1950 1951 // This flag determines whether or not the component is one of the four 1952 // special names that indicate a subset of exactly half the elements are 1953 // to be selected. 1954 bool HalvingSwizzle = false; 1955 1956 // This flag determines whether or not CompName has an 's' char prefix, 1957 // indicating that it is a string of hex values to be used as vector indices. 1958 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1959 1960 // Check that we've found one of the special components, or that the component 1961 // names must come from the same set. 1962 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1963 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1964 HalvingSwizzle = true; 1965 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1966 do 1967 compStr++; 1968 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1969 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1970 do 1971 compStr++; 1972 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1973 } 1974 1975 if (!HalvingSwizzle && *compStr) { 1976 // We didn't get to the end of the string. This means the component names 1977 // didn't come from the same set *or* we encountered an illegal name. 1978 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1979 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1980 return QualType(); 1981 } 1982 1983 // Ensure no component accessor exceeds the width of the vector type it 1984 // operates on. 1985 if (!HalvingSwizzle) { 1986 compStr = CompName.getName(); 1987 1988 if (HexSwizzle) 1989 compStr++; 1990 1991 while (*compStr) { 1992 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1993 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1994 << baseType << SourceRange(CompLoc); 1995 return QualType(); 1996 } 1997 } 1998 } 1999 2000 // If this is a halving swizzle, verify that the base type has an even 2001 // number of elements. 2002 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 2003 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 2004 << baseType << SourceRange(CompLoc); 2005 return QualType(); 2006 } 2007 2008 // The component accessor looks fine - now we need to compute the actual type. 2009 // The vector type is implied by the component accessor. For example, 2010 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 2011 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 2012 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 2013 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 2014 : CompName.getLength(); 2015 if (HexSwizzle) 2016 CompSize--; 2017 2018 if (CompSize == 1) 2019 return vecType->getElementType(); 2020 2021 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 2022 // Now look up the TypeDefDecl from the vector type. Without this, 2023 // diagostics look bad. We want extended vector types to appear built-in. 2024 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 2025 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 2026 return Context.getTypedefType(ExtVectorDecls[i]); 2027 } 2028 return VT; // should never get here (a typedef type should always be found). 2029} 2030 2031static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 2032 IdentifierInfo &Member, 2033 const Selector &Sel, 2034 ASTContext &Context) { 2035 2036 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 2037 return PD; 2038 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 2039 return OMD; 2040 2041 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 2042 E = PDecl->protocol_end(); I != E; ++I) { 2043 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 2044 Context)) 2045 return D; 2046 } 2047 return 0; 2048} 2049 2050static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 2051 IdentifierInfo &Member, 2052 const Selector &Sel, 2053 ASTContext &Context) { 2054 // Check protocols on qualified interfaces. 2055 Decl *GDecl = 0; 2056 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2057 E = QIdTy->qual_end(); I != E; ++I) { 2058 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 2059 GDecl = PD; 2060 break; 2061 } 2062 // Also must look for a getter name which uses property syntax. 2063 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 2064 GDecl = OMD; 2065 break; 2066 } 2067 } 2068 if (!GDecl) { 2069 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 2070 E = QIdTy->qual_end(); I != E; ++I) { 2071 // Search in the protocol-qualifier list of current protocol. 2072 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 2073 if (GDecl) 2074 return GDecl; 2075 } 2076 } 2077 return GDecl; 2078} 2079 2080/// FindMethodInNestedImplementations - Look up a method in current and 2081/// all base class implementations. 2082/// 2083ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 2084 const ObjCInterfaceDecl *IFace, 2085 const Selector &Sel) { 2086 ObjCMethodDecl *Method = 0; 2087 if (ObjCImplementationDecl *ImpDecl = IFace->getImplementation()) 2088 Method = ImpDecl->getInstanceMethod(Sel); 2089 2090 if (!Method && IFace->getSuperClass()) 2091 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 2092 return Method; 2093} 2094 2095Action::OwningExprResult 2096Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 2097 tok::TokenKind OpKind, SourceLocation MemberLoc, 2098 IdentifierInfo &Member, 2099 DeclPtrTy ObjCImpDecl) { 2100 Expr *BaseExpr = Base.takeAs<Expr>(); 2101 assert(BaseExpr && "no record expression"); 2102 2103 // Perform default conversions. 2104 DefaultFunctionArrayConversion(BaseExpr); 2105 2106 QualType BaseType = BaseExpr->getType(); 2107 assert(!BaseType.isNull() && "no type for member expression"); 2108 2109 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 2110 // must have pointer type, and the accessed type is the pointee. 2111 if (OpKind == tok::arrow) { 2112 if (BaseType->isDependentType()) 2113 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2114 BaseExpr, true, 2115 OpLoc, 2116 DeclarationName(&Member), 2117 MemberLoc)); 2118 else if (const PointerType *PT = BaseType->getAsPointerType()) 2119 BaseType = PT->getPointeeType(); 2120 else if (BaseType->isObjCObjectPointerType()) 2121 ; 2122 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 2123 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 2124 MemberLoc, Member)); 2125 else 2126 return ExprError(Diag(MemberLoc, 2127 diag::err_typecheck_member_reference_arrow) 2128 << BaseType << BaseExpr->getSourceRange()); 2129 } else { 2130 if (BaseType->isDependentType()) { 2131 // Require that the base type isn't a pointer type 2132 // (so we'll report an error for) 2133 // T* t; 2134 // t.f; 2135 // 2136 // In Obj-C++, however, the above expression is valid, since it could be 2137 // accessing the 'f' property if T is an Obj-C interface. The extra check 2138 // allows this, while still reporting an error if T is a struct pointer. 2139 const PointerType *PT = BaseType->getAsPointerType(); 2140 2141 if (!PT || (getLangOptions().ObjC1 && 2142 !PT->getPointeeType()->isRecordType())) 2143 return Owned(new (Context) CXXUnresolvedMemberExpr(Context, 2144 BaseExpr, false, 2145 OpLoc, 2146 DeclarationName(&Member), 2147 MemberLoc)); 2148 } 2149 } 2150 2151 // Handle field access to simple records. This also handles access to fields 2152 // of the ObjC 'id' struct. 2153 if (const RecordType *RTy = BaseType->getAsRecordType()) { 2154 RecordDecl *RDecl = RTy->getDecl(); 2155 if (RequireCompleteType(OpLoc, BaseType, 2156 diag::err_typecheck_incomplete_tag, 2157 BaseExpr->getSourceRange())) 2158 return ExprError(); 2159 2160 // The record definition is complete, now make sure the member is valid. 2161 // FIXME: Qualified name lookup for C++ is a bit more complicated than this. 2162 LookupResult Result 2163 = LookupQualifiedName(RDecl, DeclarationName(&Member), 2164 LookupMemberName, false); 2165 2166 if (!Result) 2167 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 2168 << &Member << BaseExpr->getSourceRange()); 2169 if (Result.isAmbiguous()) { 2170 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 2171 MemberLoc, BaseExpr->getSourceRange()); 2172 return ExprError(); 2173 } 2174 2175 NamedDecl *MemberDecl = Result; 2176 2177 // If the decl being referenced had an error, return an error for this 2178 // sub-expr without emitting another error, in order to avoid cascading 2179 // error cases. 2180 if (MemberDecl->isInvalidDecl()) 2181 return ExprError(); 2182 2183 // Check the use of this field 2184 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2185 return ExprError(); 2186 2187 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2188 // We may have found a field within an anonymous union or struct 2189 // (C++ [class.union]). 2190 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2191 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2192 BaseExpr, OpLoc); 2193 2194 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2195 QualType MemberType = FD->getType(); 2196 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 2197 MemberType = Ref->getPointeeType(); 2198 else { 2199 unsigned BaseAddrSpace = BaseType.getAddressSpace(); 2200 unsigned combinedQualifiers = 2201 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 2202 if (FD->isMutable()) 2203 combinedQualifiers &= ~QualType::Const; 2204 MemberType = MemberType.getQualifiedType(combinedQualifiers); 2205 if (BaseAddrSpace != MemberType.getAddressSpace()) 2206 MemberType = Context.getAddrSpaceQualType(MemberType, BaseAddrSpace); 2207 } 2208 2209 MarkDeclarationReferenced(MemberLoc, FD); 2210 PerformObjectMemberConversion(BaseExpr, FD); 2211 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 2212 MemberLoc, MemberType)); 2213 } 2214 2215 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2216 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2217 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2218 Var, MemberLoc, 2219 Var->getType().getNonReferenceType())); 2220 } 2221 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2222 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2223 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2224 MemberFn, MemberLoc, 2225 MemberFn->getType())); 2226 } 2227 if (OverloadedFunctionDecl *Ovl 2228 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 2229 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 2230 MemberLoc, Context.OverloadTy)); 2231 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2232 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2233 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 2234 Enum, MemberLoc, Enum->getType())); 2235 } 2236 if (isa<TypeDecl>(MemberDecl)) 2237 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2238 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2239 2240 // We found a declaration kind that we didn't expect. This is a 2241 // generic error message that tells the user that she can't refer 2242 // to this member with '.' or '->'. 2243 return ExprError(Diag(MemberLoc, 2244 diag::err_typecheck_member_reference_unknown) 2245 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 2246 } 2247 2248 // Handle properties on ObjC 'Class' types. 2249 if (OpKind == tok::period && BaseType->isObjCClassType()) { 2250 // Also must look for a getter name which uses property syntax. 2251 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2252 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2253 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2254 ObjCMethodDecl *Getter; 2255 // FIXME: need to also look locally in the implementation. 2256 if ((Getter = IFace->lookupClassMethod(Sel))) { 2257 // Check the use of this method. 2258 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2259 return ExprError(); 2260 } 2261 // If we found a getter then this may be a valid dot-reference, we 2262 // will look for the matching setter, in case it is needed. 2263 Selector SetterSel = 2264 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2265 PP.getSelectorTable(), &Member); 2266 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2267 if (!Setter) { 2268 // If this reference is in an @implementation, also check for 'private' 2269 // methods. 2270 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2271 } 2272 // Look through local category implementations associated with the class. 2273 if (!Setter) 2274 Setter = IFace->getCategoryClassMethod(SetterSel); 2275 2276 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2277 return ExprError(); 2278 2279 if (Getter || Setter) { 2280 QualType PType; 2281 2282 if (Getter) 2283 PType = Getter->getResultType(); 2284 else { 2285 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2286 E = Setter->param_end(); PI != E; ++PI) 2287 PType = (*PI)->getType(); 2288 } 2289 // FIXME: we must check that the setter has property type. 2290 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2291 Setter, MemberLoc, BaseExpr)); 2292 } 2293 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2294 << &Member << BaseType); 2295 } 2296 } 2297 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2298 // (*Obj).ivar. 2299 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2300 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2301 const ObjCObjectPointerType *OPT = BaseType->getAsObjCObjectPointerType(); 2302 const ObjCInterfaceType *IFaceT = 2303 OPT ? OPT->getInterfaceType() : BaseType->getAsObjCInterfaceType(); 2304 if (IFaceT) { 2305 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2306 ObjCInterfaceDecl *ClassDeclared; 2307 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(&Member, ClassDeclared); 2308 2309 if (IV) { 2310 // If the decl being referenced had an error, return an error for this 2311 // sub-expr without emitting another error, in order to avoid cascading 2312 // error cases. 2313 if (IV->isInvalidDecl()) 2314 return ExprError(); 2315 2316 // Check whether we can reference this field. 2317 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2318 return ExprError(); 2319 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2320 IV->getAccessControl() != ObjCIvarDecl::Package) { 2321 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2322 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2323 ClassOfMethodDecl = MD->getClassInterface(); 2324 else if (ObjCImpDecl && getCurFunctionDecl()) { 2325 // Case of a c-function declared inside an objc implementation. 2326 // FIXME: For a c-style function nested inside an objc implementation 2327 // class, there is no implementation context available, so we pass 2328 // down the context as argument to this routine. Ideally, this context 2329 // need be passed down in the AST node and somehow calculated from the 2330 // AST for a function decl. 2331 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2332 if (ObjCImplementationDecl *IMPD = 2333 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2334 ClassOfMethodDecl = IMPD->getClassInterface(); 2335 else if (ObjCCategoryImplDecl* CatImplClass = 2336 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2337 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2338 } 2339 2340 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2341 if (ClassDeclared != IDecl || 2342 ClassOfMethodDecl != ClassDeclared) 2343 Diag(MemberLoc, diag::error_private_ivar_access) 2344 << IV->getDeclName(); 2345 } 2346 // @protected 2347 else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2348 Diag(MemberLoc, diag::error_protected_ivar_access) 2349 << IV->getDeclName(); 2350 } 2351 2352 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2353 MemberLoc, BaseExpr, 2354 OpKind == tok::arrow)); 2355 } 2356 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2357 << IDecl->getDeclName() << &Member 2358 << BaseExpr->getSourceRange()); 2359 } 2360 // We have an 'id' type. Rather than fall through, we check if this 2361 // is a reference to 'isa'. 2362 if (Member.isStr("isa")) 2363 return Owned(new (Context) ObjCIsaExpr(BaseExpr, true, MemberLoc, 2364 Context.getObjCIdType())); 2365 } 2366 // Handle properties on 'id' and qualified "id". 2367 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2368 BaseType->isObjCQualifiedIdType())) { 2369 const ObjCObjectPointerType *QIdTy = BaseType->getAsObjCObjectPointerType(); 2370 2371 // Check protocols on qualified interfaces. 2372 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2373 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2374 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2375 // Check the use of this declaration 2376 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2377 return ExprError(); 2378 2379 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2380 MemberLoc, BaseExpr)); 2381 } 2382 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2383 // Check the use of this method. 2384 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2385 return ExprError(); 2386 2387 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2388 OMD->getResultType(), 2389 OMD, OpLoc, MemberLoc, 2390 NULL, 0)); 2391 } 2392 } 2393 2394 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2395 << &Member << BaseType); 2396 } 2397 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2398 // pointer to a (potentially qualified) interface type. 2399 const ObjCObjectPointerType *OPT; 2400 if (OpKind == tok::period && 2401 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2402 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2403 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2404 2405 // Search for a declared property first. 2406 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 2407 // Check whether we can reference this property. 2408 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2409 return ExprError(); 2410 QualType ResTy = PD->getType(); 2411 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2412 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2413 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2414 ResTy = Getter->getResultType(); 2415 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2416 MemberLoc, BaseExpr)); 2417 } 2418 // Check protocols on qualified interfaces. 2419 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2420 E = OPT->qual_end(); I != E; ++I) 2421 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 2422 // Check whether we can reference this property. 2423 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2424 return ExprError(); 2425 2426 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2427 MemberLoc, BaseExpr)); 2428 } 2429 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2430 E = OPT->qual_end(); I != E; ++I) 2431 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 2432 // Check whether we can reference this property. 2433 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2434 return ExprError(); 2435 2436 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2437 MemberLoc, BaseExpr)); 2438 } 2439 // If that failed, look for an "implicit" property by seeing if the nullary 2440 // selector is implemented. 2441 2442 // FIXME: The logic for looking up nullary and unary selectors should be 2443 // shared with the code in ActOnInstanceMessage. 2444 2445 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2446 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2447 2448 // If this reference is in an @implementation, check for 'private' methods. 2449 if (!Getter) 2450 Getter = FindMethodInNestedImplementations(IFace, Sel); 2451 2452 // Look through local category implementations associated with the class. 2453 if (!Getter) 2454 Getter = IFace->getCategoryInstanceMethod(Sel); 2455 if (Getter) { 2456 // Check if we can reference this property. 2457 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2458 return ExprError(); 2459 } 2460 // If we found a getter then this may be a valid dot-reference, we 2461 // will look for the matching setter, in case it is needed. 2462 Selector SetterSel = 2463 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2464 PP.getSelectorTable(), &Member); 2465 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2466 if (!Setter) { 2467 // If this reference is in an @implementation, also check for 'private' 2468 // methods. 2469 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2470 } 2471 // Look through local category implementations associated with the class. 2472 if (!Setter) 2473 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2474 2475 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2476 return ExprError(); 2477 2478 if (Getter || Setter) { 2479 QualType PType; 2480 2481 if (Getter) 2482 PType = Getter->getResultType(); 2483 else { 2484 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2485 E = Setter->param_end(); PI != E; ++PI) 2486 PType = (*PI)->getType(); 2487 } 2488 // FIXME: we must check that the setter has property type. 2489 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2490 Setter, MemberLoc, BaseExpr)); 2491 } 2492 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2493 << &Member << BaseType); 2494 } 2495 2496 // Handle the following exceptional case (*Obj).isa. 2497 if (OpKind == tok::period && 2498 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2499 Member.isStr("isa")) 2500 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2501 Context.getObjCIdType())); 2502 2503 // Handle 'field access' to vectors, such as 'V.xx'. 2504 if (BaseType->isExtVectorType()) { 2505 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2506 if (ret.isNull()) 2507 return ExprError(); 2508 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2509 MemberLoc)); 2510 } 2511 2512 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2513 << BaseType << BaseExpr->getSourceRange(); 2514 2515 // If the user is trying to apply -> or . to a function or function 2516 // pointer, it's probably because they forgot parentheses to call 2517 // the function. Suggest the addition of those parentheses. 2518 if (BaseType == Context.OverloadTy || 2519 BaseType->isFunctionType() || 2520 (BaseType->isPointerType() && 2521 BaseType->getAsPointerType()->isFunctionType())) { 2522 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2523 Diag(Loc, diag::note_member_reference_needs_call) 2524 << CodeModificationHint::CreateInsertion(Loc, "()"); 2525 } 2526 2527 return ExprError(); 2528} 2529 2530/// ConvertArgumentsForCall - Converts the arguments specified in 2531/// Args/NumArgs to the parameter types of the function FDecl with 2532/// function prototype Proto. Call is the call expression itself, and 2533/// Fn is the function expression. For a C++ member function, this 2534/// routine does not attempt to convert the object argument. Returns 2535/// true if the call is ill-formed. 2536bool 2537Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2538 FunctionDecl *FDecl, 2539 const FunctionProtoType *Proto, 2540 Expr **Args, unsigned NumArgs, 2541 SourceLocation RParenLoc) { 2542 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2543 // assignment, to the types of the corresponding parameter, ... 2544 unsigned NumArgsInProto = Proto->getNumArgs(); 2545 unsigned NumArgsToCheck = NumArgs; 2546 bool Invalid = false; 2547 2548 // If too few arguments are available (and we don't have default 2549 // arguments for the remaining parameters), don't make the call. 2550 if (NumArgs < NumArgsInProto) { 2551 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2552 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2553 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2554 // Use default arguments for missing arguments 2555 NumArgsToCheck = NumArgsInProto; 2556 Call->setNumArgs(Context, NumArgsInProto); 2557 } 2558 2559 // If too many are passed and not variadic, error on the extras and drop 2560 // them. 2561 if (NumArgs > NumArgsInProto) { 2562 if (!Proto->isVariadic()) { 2563 Diag(Args[NumArgsInProto]->getLocStart(), 2564 diag::err_typecheck_call_too_many_args) 2565 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2566 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2567 Args[NumArgs-1]->getLocEnd()); 2568 // This deletes the extra arguments. 2569 Call->setNumArgs(Context, NumArgsInProto); 2570 Invalid = true; 2571 } 2572 NumArgsToCheck = NumArgsInProto; 2573 } 2574 2575 // Continue to check argument types (even if we have too few/many args). 2576 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2577 QualType ProtoArgType = Proto->getArgType(i); 2578 2579 Expr *Arg; 2580 if (i < NumArgs) { 2581 Arg = Args[i]; 2582 2583 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2584 ProtoArgType, 2585 diag::err_call_incomplete_argument, 2586 Arg->getSourceRange())) 2587 return true; 2588 2589 // Pass the argument. 2590 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2591 return true; 2592 } else { 2593 if (FDecl->getParamDecl(i)->hasUnparsedDefaultArg()) { 2594 Diag (Call->getSourceRange().getBegin(), 2595 diag::err_use_of_default_argument_to_function_declared_later) << 2596 FDecl << cast<CXXRecordDecl>(FDecl->getDeclContext())->getDeclName(); 2597 Diag(UnparsedDefaultArgLocs[FDecl->getParamDecl(i)], 2598 diag::note_default_argument_declared_here); 2599 } else { 2600 Expr *DefaultExpr = FDecl->getParamDecl(i)->getDefaultArg(); 2601 2602 // If the default expression creates temporaries, we need to 2603 // push them to the current stack of expression temporaries so they'll 2604 // be properly destroyed. 2605 if (CXXExprWithTemporaries *E 2606 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2607 assert(!E->shouldDestroyTemporaries() && 2608 "Can't destroy temporaries in a default argument expr!"); 2609 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2610 ExprTemporaries.push_back(E->getTemporary(I)); 2611 } 2612 } 2613 2614 // We already type-checked the argument, so we know it works. 2615 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2616 } 2617 2618 QualType ArgType = Arg->getType(); 2619 2620 Call->setArg(i, Arg); 2621 } 2622 2623 // If this is a variadic call, handle args passed through "...". 2624 if (Proto->isVariadic()) { 2625 VariadicCallType CallType = VariadicFunction; 2626 if (Fn->getType()->isBlockPointerType()) 2627 CallType = VariadicBlock; // Block 2628 else if (isa<MemberExpr>(Fn)) 2629 CallType = VariadicMethod; 2630 2631 // Promote the arguments (C99 6.5.2.2p7). 2632 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2633 Expr *Arg = Args[i]; 2634 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2635 Call->setArg(i, Arg); 2636 } 2637 } 2638 2639 return Invalid; 2640} 2641 2642/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2643/// This provides the location of the left/right parens and a list of comma 2644/// locations. 2645Action::OwningExprResult 2646Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2647 MultiExprArg args, 2648 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2649 unsigned NumArgs = args.size(); 2650 Expr *Fn = fn.takeAs<Expr>(); 2651 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2652 assert(Fn && "no function call expression"); 2653 FunctionDecl *FDecl = NULL; 2654 NamedDecl *NDecl = NULL; 2655 DeclarationName UnqualifiedName; 2656 2657 if (getLangOptions().CPlusPlus) { 2658 // Determine whether this is a dependent call inside a C++ template, 2659 // in which case we won't do any semantic analysis now. 2660 // FIXME: Will need to cache the results of name lookup (including ADL) in 2661 // Fn. 2662 bool Dependent = false; 2663 if (Fn->isTypeDependent()) 2664 Dependent = true; 2665 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2666 Dependent = true; 2667 2668 if (Dependent) 2669 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2670 Context.DependentTy, RParenLoc)); 2671 2672 // Determine whether this is a call to an object (C++ [over.call.object]). 2673 if (Fn->getType()->isRecordType()) 2674 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2675 CommaLocs, RParenLoc)); 2676 2677 // Determine whether this is a call to a member function. 2678 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2679 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2680 if (isa<OverloadedFunctionDecl>(MemDecl) || 2681 isa<CXXMethodDecl>(MemDecl) || 2682 (isa<FunctionTemplateDecl>(MemDecl) && 2683 isa<CXXMethodDecl>( 2684 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2685 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2686 CommaLocs, RParenLoc)); 2687 } 2688 } 2689 2690 // If we're directly calling a function, get the appropriate declaration. 2691 // Also, in C++, keep track of whether we should perform argument-dependent 2692 // lookup and whether there were any explicitly-specified template arguments. 2693 Expr *FnExpr = Fn; 2694 bool ADL = true; 2695 bool HasExplicitTemplateArgs = 0; 2696 const TemplateArgument *ExplicitTemplateArgs = 0; 2697 unsigned NumExplicitTemplateArgs = 0; 2698 while (true) { 2699 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2700 FnExpr = IcExpr->getSubExpr(); 2701 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2702 // Parentheses around a function disable ADL 2703 // (C++0x [basic.lookup.argdep]p1). 2704 ADL = false; 2705 FnExpr = PExpr->getSubExpr(); 2706 } else if (isa<UnaryOperator>(FnExpr) && 2707 cast<UnaryOperator>(FnExpr)->getOpcode() 2708 == UnaryOperator::AddrOf) { 2709 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2710 } else if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(FnExpr)) { 2711 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2712 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2713 NDecl = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2714 break; 2715 } else if (UnresolvedFunctionNameExpr *DepName 2716 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2717 UnqualifiedName = DepName->getName(); 2718 break; 2719 } else if (TemplateIdRefExpr *TemplateIdRef 2720 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2721 NDecl = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2722 if (!NDecl) 2723 NDecl = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2724 HasExplicitTemplateArgs = true; 2725 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2726 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2727 2728 // C++ [temp.arg.explicit]p6: 2729 // [Note: For simple function names, argument dependent lookup (3.4.2) 2730 // applies even when the function name is not visible within the 2731 // scope of the call. This is because the call still has the syntactic 2732 // form of a function call (3.4.1). But when a function template with 2733 // explicit template arguments is used, the call does not have the 2734 // correct syntactic form unless there is a function template with 2735 // that name visible at the point of the call. If no such name is 2736 // visible, the call is not syntactically well-formed and 2737 // argument-dependent lookup does not apply. If some such name is 2738 // visible, argument dependent lookup applies and additional function 2739 // templates may be found in other namespaces. 2740 // 2741 // The summary of this paragraph is that, if we get to this point and the 2742 // template-id was not a qualified name, then argument-dependent lookup 2743 // is still possible. 2744 if (TemplateIdRef->getQualifier()) 2745 ADL = false; 2746 break; 2747 } else { 2748 // Any kind of name that does not refer to a declaration (or 2749 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2750 ADL = false; 2751 break; 2752 } 2753 } 2754 2755 OverloadedFunctionDecl *Ovl = 0; 2756 FunctionTemplateDecl *FunctionTemplate = 0; 2757 if (NDecl) { 2758 FDecl = dyn_cast<FunctionDecl>(NDecl); 2759 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2760 FDecl = FunctionTemplate->getTemplatedDecl(); 2761 else 2762 FDecl = dyn_cast<FunctionDecl>(NDecl); 2763 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2764 } 2765 2766 if (Ovl || FunctionTemplate || 2767 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2768 // We don't perform ADL for implicit declarations of builtins. 2769 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2770 ADL = false; 2771 2772 // We don't perform ADL in C. 2773 if (!getLangOptions().CPlusPlus) 2774 ADL = false; 2775 2776 if (Ovl || FunctionTemplate || ADL) { 2777 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2778 HasExplicitTemplateArgs, 2779 ExplicitTemplateArgs, 2780 NumExplicitTemplateArgs, 2781 LParenLoc, Args, NumArgs, CommaLocs, 2782 RParenLoc, ADL); 2783 if (!FDecl) 2784 return ExprError(); 2785 2786 // Update Fn to refer to the actual function selected. 2787 Expr *NewFn = 0; 2788 if (QualifiedDeclRefExpr *QDRExpr 2789 = dyn_cast<QualifiedDeclRefExpr>(FnExpr)) 2790 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2791 QDRExpr->getLocation(), 2792 false, false, 2793 QDRExpr->getQualifierRange(), 2794 QDRExpr->getQualifier()); 2795 else 2796 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2797 Fn->getSourceRange().getBegin()); 2798 Fn->Destroy(Context); 2799 Fn = NewFn; 2800 } 2801 } 2802 2803 // Promote the function operand. 2804 UsualUnaryConversions(Fn); 2805 2806 // Make the call expr early, before semantic checks. This guarantees cleanup 2807 // of arguments and function on error. 2808 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2809 Args, NumArgs, 2810 Context.BoolTy, 2811 RParenLoc)); 2812 2813 const FunctionType *FuncT; 2814 if (!Fn->getType()->isBlockPointerType()) { 2815 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2816 // have type pointer to function". 2817 const PointerType *PT = Fn->getType()->getAsPointerType(); 2818 if (PT == 0) 2819 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2820 << Fn->getType() << Fn->getSourceRange()); 2821 FuncT = PT->getPointeeType()->getAsFunctionType(); 2822 } else { // This is a block call. 2823 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2824 getAsFunctionType(); 2825 } 2826 if (FuncT == 0) 2827 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2828 << Fn->getType() << Fn->getSourceRange()); 2829 2830 // Check for a valid return type 2831 if (!FuncT->getResultType()->isVoidType() && 2832 RequireCompleteType(Fn->getSourceRange().getBegin(), 2833 FuncT->getResultType(), 2834 diag::err_call_incomplete_return, 2835 TheCall->getSourceRange())) 2836 return ExprError(); 2837 2838 // We know the result type of the call, set it. 2839 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2840 2841 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2842 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2843 RParenLoc)) 2844 return ExprError(); 2845 } else { 2846 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2847 2848 if (FDecl) { 2849 // Check if we have too few/too many template arguments, based 2850 // on our knowledge of the function definition. 2851 const FunctionDecl *Def = 0; 2852 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2853 const FunctionProtoType *Proto = 2854 Def->getType()->getAsFunctionProtoType(); 2855 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2856 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2857 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2858 } 2859 } 2860 } 2861 2862 // Promote the arguments (C99 6.5.2.2p6). 2863 for (unsigned i = 0; i != NumArgs; i++) { 2864 Expr *Arg = Args[i]; 2865 DefaultArgumentPromotion(Arg); 2866 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2867 Arg->getType(), 2868 diag::err_call_incomplete_argument, 2869 Arg->getSourceRange())) 2870 return ExprError(); 2871 TheCall->setArg(i, Arg); 2872 } 2873 } 2874 2875 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2876 if (!Method->isStatic()) 2877 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2878 << Fn->getSourceRange()); 2879 2880 // Check for sentinels 2881 if (NDecl) 2882 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2883 // Do special checking on direct calls to functions. 2884 if (FDecl) 2885 return CheckFunctionCall(FDecl, TheCall.take()); 2886 if (NDecl) 2887 return CheckBlockCall(NDecl, TheCall.take()); 2888 2889 return Owned(TheCall.take()); 2890} 2891 2892Action::OwningExprResult 2893Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2894 SourceLocation RParenLoc, ExprArg InitExpr) { 2895 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2896 QualType literalType = QualType::getFromOpaquePtr(Ty); 2897 // FIXME: put back this assert when initializers are worked out. 2898 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2899 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2900 2901 if (literalType->isArrayType()) { 2902 if (literalType->isVariableArrayType()) 2903 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2904 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2905 } else if (!literalType->isDependentType() && 2906 RequireCompleteType(LParenLoc, literalType, 2907 diag::err_typecheck_decl_incomplete_type, 2908 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2909 return ExprError(); 2910 2911 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2912 DeclarationName(), /*FIXME:DirectInit=*/false)) 2913 return ExprError(); 2914 2915 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2916 if (isFileScope) { // 6.5.2.5p3 2917 if (CheckForConstantInitializer(literalExpr, literalType)) 2918 return ExprError(); 2919 } 2920 InitExpr.release(); 2921 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2922 literalExpr, isFileScope)); 2923} 2924 2925Action::OwningExprResult 2926Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2927 SourceLocation RBraceLoc) { 2928 unsigned NumInit = initlist.size(); 2929 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2930 2931 // Semantic analysis for initializers is done by ActOnDeclarator() and 2932 // CheckInitializer() - it requires knowledge of the object being intialized. 2933 2934 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2935 RBraceLoc); 2936 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2937 return Owned(E); 2938} 2939 2940/// CheckCastTypes - Check type constraints for casting between types. 2941bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 2942 bool FunctionalStyle) { 2943 if (getLangOptions().CPlusPlus) 2944 return CXXCheckCStyleCast(TyR, castType, castExpr, FunctionalStyle); 2945 2946 UsualUnaryConversions(castExpr); 2947 2948 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2949 // type needs to be scalar. 2950 if (castType->isVoidType()) { 2951 // Cast to void allows any expr type. 2952 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2953 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2954 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2955 (castType->isStructureType() || castType->isUnionType())) { 2956 // GCC struct/union extension: allow cast to self. 2957 // FIXME: Check that the cast destination type is complete. 2958 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2959 << castType << castExpr->getSourceRange(); 2960 } else if (castType->isUnionType()) { 2961 // GCC cast to union extension 2962 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2963 RecordDecl::field_iterator Field, FieldEnd; 2964 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2965 Field != FieldEnd; ++Field) { 2966 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2967 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2968 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2969 << castExpr->getSourceRange(); 2970 break; 2971 } 2972 } 2973 if (Field == FieldEnd) 2974 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2975 << castExpr->getType() << castExpr->getSourceRange(); 2976 } else { 2977 // Reject any other conversions to non-scalar types. 2978 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2979 << castType << castExpr->getSourceRange(); 2980 } 2981 } else if (!castExpr->getType()->isScalarType() && 2982 !castExpr->getType()->isVectorType()) { 2983 return Diag(castExpr->getLocStart(), 2984 diag::err_typecheck_expect_scalar_operand) 2985 << castExpr->getType() << castExpr->getSourceRange(); 2986 } else if (castType->isExtVectorType()) { 2987 if (CheckExtVectorCast(TyR, castType, castExpr->getType())) 2988 return true; 2989 } else if (castType->isVectorType()) { 2990 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2991 return true; 2992 } else if (castExpr->getType()->isVectorType()) { 2993 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2994 return true; 2995 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2996 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2997 } else if (!castType->isArithmeticType()) { 2998 QualType castExprType = castExpr->getType(); 2999 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3000 return Diag(castExpr->getLocStart(), 3001 diag::err_cast_pointer_from_non_pointer_int) 3002 << castExprType << castExpr->getSourceRange(); 3003 } else if (!castExpr->getType()->isArithmeticType()) { 3004 if (!castType->isIntegralType() && castType->isArithmeticType()) 3005 return Diag(castExpr->getLocStart(), 3006 diag::err_cast_pointer_to_non_pointer_int) 3007 << castType << castExpr->getSourceRange(); 3008 } 3009 if (isa<ObjCSelectorExpr>(castExpr)) 3010 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3011 return false; 3012} 3013 3014bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 3015 assert(VectorTy->isVectorType() && "Not a vector type!"); 3016 3017 if (Ty->isVectorType() || Ty->isIntegerType()) { 3018 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3019 return Diag(R.getBegin(), 3020 Ty->isVectorType() ? 3021 diag::err_invalid_conversion_between_vectors : 3022 diag::err_invalid_conversion_between_vector_and_integer) 3023 << VectorTy << Ty << R; 3024 } else 3025 return Diag(R.getBegin(), 3026 diag::err_invalid_conversion_between_vector_and_scalar) 3027 << VectorTy << Ty << R; 3028 3029 return false; 3030} 3031 3032bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, QualType SrcTy) { 3033 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3034 3035 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3036 // an ExtVectorType. 3037 if (SrcTy->isVectorType()) { 3038 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3039 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3040 << DestTy << SrcTy << R; 3041 return false; 3042 } 3043 3044 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3045 // conversion will take place first from scalar to elt type, and then 3046 // splat from elt type to vector. 3047 if (SrcTy->isPointerType()) 3048 return Diag(R.getBegin(), 3049 diag::err_invalid_conversion_between_vector_and_scalar) 3050 << DestTy << SrcTy << R; 3051 return false; 3052} 3053 3054Action::OwningExprResult 3055Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 3056 SourceLocation RParenLoc, ExprArg Op) { 3057 assert((Ty != 0) && (Op.get() != 0) && 3058 "ActOnCastExpr(): missing type or expr"); 3059 3060 Expr *castExpr = Op.takeAs<Expr>(); 3061 QualType castType = QualType::getFromOpaquePtr(Ty); 3062 3063 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 3064 return ExprError(); 3065 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3066 castExpr, castType, 3067 LParenLoc, RParenLoc)); 3068} 3069 3070/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3071/// In that case, lhs = cond. 3072/// C99 6.5.15 3073QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3074 SourceLocation QuestionLoc) { 3075 // C++ is sufficiently different to merit its own checker. 3076 if (getLangOptions().CPlusPlus) 3077 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3078 3079 UsualUnaryConversions(Cond); 3080 UsualUnaryConversions(LHS); 3081 UsualUnaryConversions(RHS); 3082 QualType CondTy = Cond->getType(); 3083 QualType LHSTy = LHS->getType(); 3084 QualType RHSTy = RHS->getType(); 3085 3086 // first, check the condition. 3087 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3088 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3089 << CondTy; 3090 return QualType(); 3091 } 3092 3093 // Now check the two expressions. 3094 3095 // If both operands have arithmetic type, do the usual arithmetic conversions 3096 // to find a common type: C99 6.5.15p3,5. 3097 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3098 UsualArithmeticConversions(LHS, RHS); 3099 return LHS->getType(); 3100 } 3101 3102 // If both operands are the same structure or union type, the result is that 3103 // type. 3104 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 3105 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 3106 if (LHSRT->getDecl() == RHSRT->getDecl()) 3107 // "If both the operands have structure or union type, the result has 3108 // that type." This implies that CV qualifiers are dropped. 3109 return LHSTy.getUnqualifiedType(); 3110 // FIXME: Type of conditional expression must be complete in C mode. 3111 } 3112 3113 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3114 // The following || allows only one side to be void (a GCC-ism). 3115 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3116 if (!LHSTy->isVoidType()) 3117 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3118 << RHS->getSourceRange(); 3119 if (!RHSTy->isVoidType()) 3120 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3121 << LHS->getSourceRange(); 3122 ImpCastExprToType(LHS, Context.VoidTy); 3123 ImpCastExprToType(RHS, Context.VoidTy); 3124 return Context.VoidTy; 3125 } 3126 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3127 // the type of the other operand." 3128 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3129 RHS->isNullPointerConstant(Context)) { 3130 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 3131 return LHSTy; 3132 } 3133 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3134 LHS->isNullPointerConstant(Context)) { 3135 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 3136 return RHSTy; 3137 } 3138 // Handle block pointer types. 3139 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3140 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3141 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3142 QualType destType = Context.getPointerType(Context.VoidTy); 3143 ImpCastExprToType(LHS, destType); 3144 ImpCastExprToType(RHS, destType); 3145 return destType; 3146 } 3147 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3148 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3149 return QualType(); 3150 } 3151 // We have 2 block pointer types. 3152 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3153 // Two identical block pointer types are always compatible. 3154 return LHSTy; 3155 } 3156 // The block pointer types aren't identical, continue checking. 3157 QualType lhptee = LHSTy->getAsBlockPointerType()->getPointeeType(); 3158 QualType rhptee = RHSTy->getAsBlockPointerType()->getPointeeType(); 3159 3160 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3161 rhptee.getUnqualifiedType())) { 3162 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3163 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3164 // In this situation, we assume void* type. No especially good 3165 // reason, but this is what gcc does, and we do have to pick 3166 // to get a consistent AST. 3167 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3168 ImpCastExprToType(LHS, incompatTy); 3169 ImpCastExprToType(RHS, incompatTy); 3170 return incompatTy; 3171 } 3172 // The block pointer types are compatible. 3173 ImpCastExprToType(LHS, LHSTy); 3174 ImpCastExprToType(RHS, LHSTy); 3175 return LHSTy; 3176 } 3177 // Check constraints for Objective-C object pointers types. 3178 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3179 3180 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3181 // Two identical object pointer types are always compatible. 3182 return LHSTy; 3183 } 3184 const ObjCObjectPointerType *LHSOPT = LHSTy->getAsObjCObjectPointerType(); 3185 const ObjCObjectPointerType *RHSOPT = RHSTy->getAsObjCObjectPointerType(); 3186 QualType compositeType = LHSTy; 3187 3188 // If both operands are interfaces and either operand can be 3189 // assigned to the other, use that type as the composite 3190 // type. This allows 3191 // xxx ? (A*) a : (B*) b 3192 // where B is a subclass of A. 3193 // 3194 // Additionally, as for assignment, if either type is 'id' 3195 // allow silent coercion. Finally, if the types are 3196 // incompatible then make sure to use 'id' as the composite 3197 // type so the result is acceptable for sending messages to. 3198 3199 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3200 // It could return the composite type. 3201 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3202 compositeType = LHSTy; 3203 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3204 compositeType = RHSTy; 3205 } else if ((LHSTy->isObjCQualifiedIdType() || 3206 RHSTy->isObjCQualifiedIdType()) && 3207 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3208 // Need to handle "id<xx>" explicitly. 3209 // GCC allows qualified id and any Objective-C type to devolve to 3210 // id. Currently localizing to here until clear this should be 3211 // part of ObjCQualifiedIdTypesAreCompatible. 3212 compositeType = Context.getObjCIdType(); 3213 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3214 compositeType = Context.getObjCIdType(); 3215 } else { 3216 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3217 << LHSTy << RHSTy 3218 << LHS->getSourceRange() << RHS->getSourceRange(); 3219 QualType incompatTy = Context.getObjCIdType(); 3220 ImpCastExprToType(LHS, incompatTy); 3221 ImpCastExprToType(RHS, incompatTy); 3222 return incompatTy; 3223 } 3224 // The object pointer types are compatible. 3225 ImpCastExprToType(LHS, compositeType); 3226 ImpCastExprToType(RHS, compositeType); 3227 return compositeType; 3228 } 3229 // Check Objective-C object pointer types and 'void *' 3230 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3231 QualType lhptee = LHSTy->getAsPointerType()->getPointeeType(); 3232 QualType rhptee = RHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3233 QualType destPointee = lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3234 QualType destType = Context.getPointerType(destPointee); 3235 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3236 ImpCastExprToType(RHS, destType); // promote to void* 3237 return destType; 3238 } 3239 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3240 QualType lhptee = LHSTy->getAsObjCObjectPointerType()->getPointeeType(); 3241 QualType rhptee = RHSTy->getAsPointerType()->getPointeeType(); 3242 QualType destPointee = rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3243 QualType destType = Context.getPointerType(destPointee); 3244 ImpCastExprToType(RHS, destType); // add qualifiers if necessary 3245 ImpCastExprToType(LHS, destType); // promote to void* 3246 return destType; 3247 } 3248 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3249 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3250 // get the "pointed to" types 3251 QualType lhptee = LHSTy->getAsPointerType()->getPointeeType(); 3252 QualType rhptee = RHSTy->getAsPointerType()->getPointeeType(); 3253 3254 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3255 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3256 // Figure out necessary qualifiers (C99 6.5.15p6) 3257 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 3258 QualType destType = Context.getPointerType(destPointee); 3259 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3260 ImpCastExprToType(RHS, destType); // promote to void* 3261 return destType; 3262 } 3263 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3264 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 3265 QualType destType = Context.getPointerType(destPointee); 3266 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 3267 ImpCastExprToType(RHS, destType); // promote to void* 3268 return destType; 3269 } 3270 3271 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3272 // Two identical pointer types are always compatible. 3273 return LHSTy; 3274 } 3275 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3276 rhptee.getUnqualifiedType())) { 3277 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3278 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3279 // In this situation, we assume void* type. No especially good 3280 // reason, but this is what gcc does, and we do have to pick 3281 // to get a consistent AST. 3282 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3283 ImpCastExprToType(LHS, incompatTy); 3284 ImpCastExprToType(RHS, incompatTy); 3285 return incompatTy; 3286 } 3287 // The pointer types are compatible. 3288 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3289 // differently qualified versions of compatible types, the result type is 3290 // a pointer to an appropriately qualified version of the *composite* 3291 // type. 3292 // FIXME: Need to calculate the composite type. 3293 // FIXME: Need to add qualifiers 3294 ImpCastExprToType(LHS, LHSTy); 3295 ImpCastExprToType(RHS, LHSTy); 3296 return LHSTy; 3297 } 3298 3299 // GCC compatibility: soften pointer/integer mismatch. 3300 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3301 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3302 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3303 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 3304 return RHSTy; 3305 } 3306 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3307 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3308 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3309 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 3310 return LHSTy; 3311 } 3312 3313 // Otherwise, the operands are not compatible. 3314 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3315 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3316 return QualType(); 3317} 3318 3319/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3320/// in the case of a the GNU conditional expr extension. 3321Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3322 SourceLocation ColonLoc, 3323 ExprArg Cond, ExprArg LHS, 3324 ExprArg RHS) { 3325 Expr *CondExpr = (Expr *) Cond.get(); 3326 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3327 3328 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3329 // was the condition. 3330 bool isLHSNull = LHSExpr == 0; 3331 if (isLHSNull) 3332 LHSExpr = CondExpr; 3333 3334 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3335 RHSExpr, QuestionLoc); 3336 if (result.isNull()) 3337 return ExprError(); 3338 3339 Cond.release(); 3340 LHS.release(); 3341 RHS.release(); 3342 return Owned(new (Context) ConditionalOperator(CondExpr, 3343 isLHSNull ? 0 : LHSExpr, 3344 RHSExpr, result)); 3345} 3346 3347// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3348// being closely modeled after the C99 spec:-). The odd characteristic of this 3349// routine is it effectively iqnores the qualifiers on the top level pointee. 3350// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3351// FIXME: add a couple examples in this comment. 3352Sema::AssignConvertType 3353Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3354 QualType lhptee, rhptee; 3355 3356 // get the "pointed to" type (ignoring qualifiers at the top level) 3357 lhptee = lhsType->getAsPointerType()->getPointeeType(); 3358 rhptee = rhsType->getAsPointerType()->getPointeeType(); 3359 3360 // make sure we operate on the canonical type 3361 lhptee = Context.getCanonicalType(lhptee); 3362 rhptee = Context.getCanonicalType(rhptee); 3363 3364 AssignConvertType ConvTy = Compatible; 3365 3366 // C99 6.5.16.1p1: This following citation is common to constraints 3367 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3368 // qualifiers of the type *pointed to* by the right; 3369 // FIXME: Handle ExtQualType 3370 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3371 ConvTy = CompatiblePointerDiscardsQualifiers; 3372 3373 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3374 // incomplete type and the other is a pointer to a qualified or unqualified 3375 // version of void... 3376 if (lhptee->isVoidType()) { 3377 if (rhptee->isIncompleteOrObjectType()) 3378 return ConvTy; 3379 3380 // As an extension, we allow cast to/from void* to function pointer. 3381 assert(rhptee->isFunctionType()); 3382 return FunctionVoidPointer; 3383 } 3384 3385 if (rhptee->isVoidType()) { 3386 if (lhptee->isIncompleteOrObjectType()) 3387 return ConvTy; 3388 3389 // As an extension, we allow cast to/from void* to function pointer. 3390 assert(lhptee->isFunctionType()); 3391 return FunctionVoidPointer; 3392 } 3393 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3394 // unqualified versions of compatible types, ... 3395 lhptee = lhptee.getUnqualifiedType(); 3396 rhptee = rhptee.getUnqualifiedType(); 3397 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3398 // Check if the pointee types are compatible ignoring the sign. 3399 // We explicitly check for char so that we catch "char" vs 3400 // "unsigned char" on systems where "char" is unsigned. 3401 if (lhptee->isCharType()) { 3402 lhptee = Context.UnsignedCharTy; 3403 } else if (lhptee->isSignedIntegerType()) { 3404 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3405 } 3406 if (rhptee->isCharType()) { 3407 rhptee = Context.UnsignedCharTy; 3408 } else if (rhptee->isSignedIntegerType()) { 3409 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3410 } 3411 if (lhptee == rhptee) { 3412 // Types are compatible ignoring the sign. Qualifier incompatibility 3413 // takes priority over sign incompatibility because the sign 3414 // warning can be disabled. 3415 if (ConvTy != Compatible) 3416 return ConvTy; 3417 return IncompatiblePointerSign; 3418 } 3419 // General pointer incompatibility takes priority over qualifiers. 3420 return IncompatiblePointer; 3421 } 3422 return ConvTy; 3423} 3424 3425/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3426/// block pointer types are compatible or whether a block and normal pointer 3427/// are compatible. It is more restrict than comparing two function pointer 3428// types. 3429Sema::AssignConvertType 3430Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3431 QualType rhsType) { 3432 QualType lhptee, rhptee; 3433 3434 // get the "pointed to" type (ignoring qualifiers at the top level) 3435 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 3436 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 3437 3438 // make sure we operate on the canonical type 3439 lhptee = Context.getCanonicalType(lhptee); 3440 rhptee = Context.getCanonicalType(rhptee); 3441 3442 AssignConvertType ConvTy = Compatible; 3443 3444 // For blocks we enforce that qualifiers are identical. 3445 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3446 ConvTy = CompatiblePointerDiscardsQualifiers; 3447 3448 if (!Context.typesAreCompatible(lhptee, rhptee)) 3449 return IncompatibleBlockPointer; 3450 return ConvTy; 3451} 3452 3453/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3454/// has code to accommodate several GCC extensions when type checking 3455/// pointers. Here are some objectionable examples that GCC considers warnings: 3456/// 3457/// int a, *pint; 3458/// short *pshort; 3459/// struct foo *pfoo; 3460/// 3461/// pint = pshort; // warning: assignment from incompatible pointer type 3462/// a = pint; // warning: assignment makes integer from pointer without a cast 3463/// pint = a; // warning: assignment makes pointer from integer without a cast 3464/// pint = pfoo; // warning: assignment from incompatible pointer type 3465/// 3466/// As a result, the code for dealing with pointers is more complex than the 3467/// C99 spec dictates. 3468/// 3469Sema::AssignConvertType 3470Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3471 // Get canonical types. We're not formatting these types, just comparing 3472 // them. 3473 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3474 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3475 3476 if (lhsType == rhsType) 3477 return Compatible; // Common case: fast path an exact match. 3478 3479 // If the left-hand side is a reference type, then we are in a 3480 // (rare!) case where we've allowed the use of references in C, 3481 // e.g., as a parameter type in a built-in function. In this case, 3482 // just make sure that the type referenced is compatible with the 3483 // right-hand side type. The caller is responsible for adjusting 3484 // lhsType so that the resulting expression does not have reference 3485 // type. 3486 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3487 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3488 return Compatible; 3489 return Incompatible; 3490 } 3491 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3492 // to the same ExtVector type. 3493 if (lhsType->isExtVectorType()) { 3494 if (rhsType->isExtVectorType()) 3495 return lhsType == rhsType ? Compatible : Incompatible; 3496 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3497 return Compatible; 3498 } 3499 3500 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3501 // If we are allowing lax vector conversions, and LHS and RHS are both 3502 // vectors, the total size only needs to be the same. This is a bitcast; 3503 // no bits are changed but the result type is different. 3504 if (getLangOptions().LaxVectorConversions && 3505 lhsType->isVectorType() && rhsType->isVectorType()) { 3506 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3507 return IncompatibleVectors; 3508 } 3509 return Incompatible; 3510 } 3511 3512 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3513 return Compatible; 3514 3515 if (isa<PointerType>(lhsType)) { 3516 if (rhsType->isIntegerType()) 3517 return IntToPointer; 3518 3519 if (isa<PointerType>(rhsType)) 3520 return CheckPointerTypesForAssignment(lhsType, rhsType); 3521 3522 // In general, C pointers are not compatible with ObjC object pointers. 3523 if (isa<ObjCObjectPointerType>(rhsType)) { 3524 if (lhsType->isVoidPointerType()) // an exception to the rule. 3525 return Compatible; 3526 return IncompatiblePointer; 3527 } 3528 if (rhsType->getAsBlockPointerType()) { 3529 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3530 return Compatible; 3531 3532 // Treat block pointers as objects. 3533 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3534 return Compatible; 3535 } 3536 return Incompatible; 3537 } 3538 3539 if (isa<BlockPointerType>(lhsType)) { 3540 if (rhsType->isIntegerType()) 3541 return IntToBlockPointer; 3542 3543 // Treat block pointers as objects. 3544 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3545 return Compatible; 3546 3547 if (rhsType->isBlockPointerType()) 3548 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3549 3550 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3551 if (RHSPT->getPointeeType()->isVoidType()) 3552 return Compatible; 3553 } 3554 return Incompatible; 3555 } 3556 3557 if (isa<ObjCObjectPointerType>(lhsType)) { 3558 if (rhsType->isIntegerType()) 3559 return IntToPointer; 3560 3561 // In general, C pointers are not compatible with ObjC object pointers. 3562 if (isa<PointerType>(rhsType)) { 3563 if (rhsType->isVoidPointerType()) // an exception to the rule. 3564 return Compatible; 3565 return IncompatiblePointer; 3566 } 3567 if (rhsType->isObjCObjectPointerType()) { 3568 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3569 return Compatible; 3570 if (Context.typesAreCompatible(lhsType, rhsType)) 3571 return Compatible; 3572 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3573 return IncompatibleObjCQualifiedId; 3574 return IncompatiblePointer; 3575 } 3576 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3577 if (RHSPT->getPointeeType()->isVoidType()) 3578 return Compatible; 3579 } 3580 // Treat block pointers as objects. 3581 if (rhsType->isBlockPointerType()) 3582 return Compatible; 3583 return Incompatible; 3584 } 3585 if (isa<PointerType>(rhsType)) { 3586 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3587 if (lhsType == Context.BoolTy) 3588 return Compatible; 3589 3590 if (lhsType->isIntegerType()) 3591 return PointerToInt; 3592 3593 if (isa<PointerType>(lhsType)) 3594 return CheckPointerTypesForAssignment(lhsType, rhsType); 3595 3596 if (isa<BlockPointerType>(lhsType) && 3597 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3598 return Compatible; 3599 return Incompatible; 3600 } 3601 if (isa<ObjCObjectPointerType>(rhsType)) { 3602 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3603 if (lhsType == Context.BoolTy) 3604 return Compatible; 3605 3606 if (lhsType->isIntegerType()) 3607 return PointerToInt; 3608 3609 // In general, C pointers are not compatible with ObjC object pointers. 3610 if (isa<PointerType>(lhsType)) { 3611 if (lhsType->isVoidPointerType()) // an exception to the rule. 3612 return Compatible; 3613 return IncompatiblePointer; 3614 } 3615 if (isa<BlockPointerType>(lhsType) && 3616 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3617 return Compatible; 3618 return Incompatible; 3619 } 3620 3621 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3622 if (Context.typesAreCompatible(lhsType, rhsType)) 3623 return Compatible; 3624 } 3625 return Incompatible; 3626} 3627 3628/// \brief Constructs a transparent union from an expression that is 3629/// used to initialize the transparent union. 3630static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3631 QualType UnionType, FieldDecl *Field) { 3632 // Build an initializer list that designates the appropriate member 3633 // of the transparent union. 3634 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3635 &E, 1, 3636 SourceLocation()); 3637 Initializer->setType(UnionType); 3638 Initializer->setInitializedFieldInUnion(Field); 3639 3640 // Build a compound literal constructing a value of the transparent 3641 // union type from this initializer list. 3642 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3643 false); 3644} 3645 3646Sema::AssignConvertType 3647Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3648 QualType FromType = rExpr->getType(); 3649 3650 // If the ArgType is a Union type, we want to handle a potential 3651 // transparent_union GCC extension. 3652 const RecordType *UT = ArgType->getAsUnionType(); 3653 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3654 return Incompatible; 3655 3656 // The field to initialize within the transparent union. 3657 RecordDecl *UD = UT->getDecl(); 3658 FieldDecl *InitField = 0; 3659 // It's compatible if the expression matches any of the fields. 3660 for (RecordDecl::field_iterator it = UD->field_begin(), 3661 itend = UD->field_end(); 3662 it != itend; ++it) { 3663 if (it->getType()->isPointerType()) { 3664 // If the transparent union contains a pointer type, we allow: 3665 // 1) void pointer 3666 // 2) null pointer constant 3667 if (FromType->isPointerType()) 3668 if (FromType->getAsPointerType()->getPointeeType()->isVoidType()) { 3669 ImpCastExprToType(rExpr, it->getType()); 3670 InitField = *it; 3671 break; 3672 } 3673 3674 if (rExpr->isNullPointerConstant(Context)) { 3675 ImpCastExprToType(rExpr, it->getType()); 3676 InitField = *it; 3677 break; 3678 } 3679 } 3680 3681 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 3682 == Compatible) { 3683 InitField = *it; 3684 break; 3685 } 3686 } 3687 3688 if (!InitField) 3689 return Incompatible; 3690 3691 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 3692 return Compatible; 3693} 3694 3695Sema::AssignConvertType 3696Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3697 if (getLangOptions().CPlusPlus) { 3698 if (!lhsType->isRecordType()) { 3699 // C++ 5.17p3: If the left operand is not of class type, the 3700 // expression is implicitly converted (C++ 4) to the 3701 // cv-unqualified type of the left operand. 3702 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3703 "assigning")) 3704 return Incompatible; 3705 return Compatible; 3706 } 3707 3708 // FIXME: Currently, we fall through and treat C++ classes like C 3709 // structures. 3710 } 3711 3712 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3713 // a null pointer constant. 3714 if ((lhsType->isPointerType() || 3715 lhsType->isObjCObjectPointerType() || 3716 lhsType->isBlockPointerType()) 3717 && rExpr->isNullPointerConstant(Context)) { 3718 ImpCastExprToType(rExpr, lhsType); 3719 return Compatible; 3720 } 3721 3722 // This check seems unnatural, however it is necessary to ensure the proper 3723 // conversion of functions/arrays. If the conversion were done for all 3724 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3725 // expressions that surpress this implicit conversion (&, sizeof). 3726 // 3727 // Suppress this for references: C++ 8.5.3p5. 3728 if (!lhsType->isReferenceType()) 3729 DefaultFunctionArrayConversion(rExpr); 3730 3731 Sema::AssignConvertType result = 3732 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3733 3734 // C99 6.5.16.1p2: The value of the right operand is converted to the 3735 // type of the assignment expression. 3736 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3737 // so that we can use references in built-in functions even in C. 3738 // The getNonReferenceType() call makes sure that the resulting expression 3739 // does not have reference type. 3740 if (result != Incompatible && rExpr->getType() != lhsType) 3741 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3742 return result; 3743} 3744 3745QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3746 Diag(Loc, diag::err_typecheck_invalid_operands) 3747 << lex->getType() << rex->getType() 3748 << lex->getSourceRange() << rex->getSourceRange(); 3749 return QualType(); 3750} 3751 3752inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3753 Expr *&rex) { 3754 // For conversion purposes, we ignore any qualifiers. 3755 // For example, "const float" and "float" are equivalent. 3756 QualType lhsType = 3757 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3758 QualType rhsType = 3759 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3760 3761 // If the vector types are identical, return. 3762 if (lhsType == rhsType) 3763 return lhsType; 3764 3765 // Handle the case of a vector & extvector type of the same size and element 3766 // type. It would be nice if we only had one vector type someday. 3767 if (getLangOptions().LaxVectorConversions) { 3768 // FIXME: Should we warn here? 3769 if (const VectorType *LV = lhsType->getAsVectorType()) { 3770 if (const VectorType *RV = rhsType->getAsVectorType()) 3771 if (LV->getElementType() == RV->getElementType() && 3772 LV->getNumElements() == RV->getNumElements()) { 3773 return lhsType->isExtVectorType() ? lhsType : rhsType; 3774 } 3775 } 3776 } 3777 3778 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 3779 // swap back (so that we don't reverse the inputs to a subtract, for instance. 3780 bool swapped = false; 3781 if (rhsType->isExtVectorType()) { 3782 swapped = true; 3783 std::swap(rex, lex); 3784 std::swap(rhsType, lhsType); 3785 } 3786 3787 // Handle the case of an ext vector and scalar. 3788 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) { 3789 QualType EltTy = LV->getElementType(); 3790 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 3791 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 3792 ImpCastExprToType(rex, lhsType); 3793 if (swapped) std::swap(rex, lex); 3794 return lhsType; 3795 } 3796 } 3797 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 3798 rhsType->isRealFloatingType()) { 3799 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 3800 ImpCastExprToType(rex, lhsType); 3801 if (swapped) std::swap(rex, lex); 3802 return lhsType; 3803 } 3804 } 3805 } 3806 3807 // Vectors of different size or scalar and non-ext-vector are errors. 3808 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3809 << lex->getType() << rex->getType() 3810 << lex->getSourceRange() << rex->getSourceRange(); 3811 return QualType(); 3812} 3813 3814inline QualType Sema::CheckMultiplyDivideOperands( 3815 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3816{ 3817 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3818 return CheckVectorOperands(Loc, lex, rex); 3819 3820 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3821 3822 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3823 return compType; 3824 return InvalidOperands(Loc, lex, rex); 3825} 3826 3827inline QualType Sema::CheckRemainderOperands( 3828 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3829{ 3830 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3831 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3832 return CheckVectorOperands(Loc, lex, rex); 3833 return InvalidOperands(Loc, lex, rex); 3834 } 3835 3836 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3837 3838 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3839 return compType; 3840 return InvalidOperands(Loc, lex, rex); 3841} 3842 3843inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3844 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3845{ 3846 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3847 QualType compType = CheckVectorOperands(Loc, lex, rex); 3848 if (CompLHSTy) *CompLHSTy = compType; 3849 return compType; 3850 } 3851 3852 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3853 3854 // handle the common case first (both operands are arithmetic). 3855 if (lex->getType()->isArithmeticType() && 3856 rex->getType()->isArithmeticType()) { 3857 if (CompLHSTy) *CompLHSTy = compType; 3858 return compType; 3859 } 3860 3861 // Put any potential pointer into PExp 3862 Expr* PExp = lex, *IExp = rex; 3863 if (IExp->getType()->isAnyPointerType()) 3864 std::swap(PExp, IExp); 3865 3866 if (PExp->getType()->isAnyPointerType()) { 3867 3868 if (IExp->getType()->isIntegerType()) { 3869 QualType PointeeTy = PExp->getType()->getPointeeType(); 3870 3871 // Check for arithmetic on pointers to incomplete types. 3872 if (PointeeTy->isVoidType()) { 3873 if (getLangOptions().CPlusPlus) { 3874 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3875 << lex->getSourceRange() << rex->getSourceRange(); 3876 return QualType(); 3877 } 3878 3879 // GNU extension: arithmetic on pointer to void 3880 Diag(Loc, diag::ext_gnu_void_ptr) 3881 << lex->getSourceRange() << rex->getSourceRange(); 3882 } else if (PointeeTy->isFunctionType()) { 3883 if (getLangOptions().CPlusPlus) { 3884 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3885 << lex->getType() << lex->getSourceRange(); 3886 return QualType(); 3887 } 3888 3889 // GNU extension: arithmetic on pointer to function 3890 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3891 << lex->getType() << lex->getSourceRange(); 3892 } else { 3893 // Check if we require a complete type. 3894 if (((PExp->getType()->isPointerType() && 3895 !PExp->getType()->isDependentType()) || 3896 PExp->getType()->isObjCObjectPointerType()) && 3897 RequireCompleteType(Loc, PointeeTy, 3898 diag::err_typecheck_arithmetic_incomplete_type, 3899 PExp->getSourceRange(), SourceRange(), 3900 PExp->getType())) 3901 return QualType(); 3902 } 3903 // Diagnose bad cases where we step over interface counts. 3904 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3905 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3906 << PointeeTy << PExp->getSourceRange(); 3907 return QualType(); 3908 } 3909 3910 if (CompLHSTy) { 3911 QualType LHSTy = lex->getType(); 3912 if (LHSTy->isPromotableIntegerType()) 3913 LHSTy = Context.IntTy; 3914 else { 3915 QualType T = isPromotableBitField(lex, Context); 3916 if (!T.isNull()) 3917 LHSTy = T; 3918 } 3919 3920 *CompLHSTy = LHSTy; 3921 } 3922 return PExp->getType(); 3923 } 3924 } 3925 3926 return InvalidOperands(Loc, lex, rex); 3927} 3928 3929// C99 6.5.6 3930QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3931 SourceLocation Loc, QualType* CompLHSTy) { 3932 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3933 QualType compType = CheckVectorOperands(Loc, lex, rex); 3934 if (CompLHSTy) *CompLHSTy = compType; 3935 return compType; 3936 } 3937 3938 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3939 3940 // Enforce type constraints: C99 6.5.6p3. 3941 3942 // Handle the common case first (both operands are arithmetic). 3943 if (lex->getType()->isArithmeticType() 3944 && rex->getType()->isArithmeticType()) { 3945 if (CompLHSTy) *CompLHSTy = compType; 3946 return compType; 3947 } 3948 3949 // Either ptr - int or ptr - ptr. 3950 if (lex->getType()->isAnyPointerType()) { 3951 QualType lpointee = lex->getType()->getPointeeType(); 3952 3953 // The LHS must be an completely-defined object type. 3954 3955 bool ComplainAboutVoid = false; 3956 Expr *ComplainAboutFunc = 0; 3957 if (lpointee->isVoidType()) { 3958 if (getLangOptions().CPlusPlus) { 3959 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3960 << lex->getSourceRange() << rex->getSourceRange(); 3961 return QualType(); 3962 } 3963 3964 // GNU C extension: arithmetic on pointer to void 3965 ComplainAboutVoid = true; 3966 } else if (lpointee->isFunctionType()) { 3967 if (getLangOptions().CPlusPlus) { 3968 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3969 << lex->getType() << lex->getSourceRange(); 3970 return QualType(); 3971 } 3972 3973 // GNU C extension: arithmetic on pointer to function 3974 ComplainAboutFunc = lex; 3975 } else if (!lpointee->isDependentType() && 3976 RequireCompleteType(Loc, lpointee, 3977 diag::err_typecheck_sub_ptr_object, 3978 lex->getSourceRange(), 3979 SourceRange(), 3980 lex->getType())) 3981 return QualType(); 3982 3983 // Diagnose bad cases where we step over interface counts. 3984 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3985 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3986 << lpointee << lex->getSourceRange(); 3987 return QualType(); 3988 } 3989 3990 // The result type of a pointer-int computation is the pointer type. 3991 if (rex->getType()->isIntegerType()) { 3992 if (ComplainAboutVoid) 3993 Diag(Loc, diag::ext_gnu_void_ptr) 3994 << lex->getSourceRange() << rex->getSourceRange(); 3995 if (ComplainAboutFunc) 3996 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3997 << ComplainAboutFunc->getType() 3998 << ComplainAboutFunc->getSourceRange(); 3999 4000 if (CompLHSTy) *CompLHSTy = lex->getType(); 4001 return lex->getType(); 4002 } 4003 4004 // Handle pointer-pointer subtractions. 4005 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 4006 QualType rpointee = RHSPTy->getPointeeType(); 4007 4008 // RHS must be a completely-type object type. 4009 // Handle the GNU void* extension. 4010 if (rpointee->isVoidType()) { 4011 if (getLangOptions().CPlusPlus) { 4012 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4013 << lex->getSourceRange() << rex->getSourceRange(); 4014 return QualType(); 4015 } 4016 4017 ComplainAboutVoid = true; 4018 } else if (rpointee->isFunctionType()) { 4019 if (getLangOptions().CPlusPlus) { 4020 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4021 << rex->getType() << rex->getSourceRange(); 4022 return QualType(); 4023 } 4024 4025 // GNU extension: arithmetic on pointer to function 4026 if (!ComplainAboutFunc) 4027 ComplainAboutFunc = rex; 4028 } else if (!rpointee->isDependentType() && 4029 RequireCompleteType(Loc, rpointee, 4030 diag::err_typecheck_sub_ptr_object, 4031 rex->getSourceRange(), 4032 SourceRange(), 4033 rex->getType())) 4034 return QualType(); 4035 4036 if (getLangOptions().CPlusPlus) { 4037 // Pointee types must be the same: C++ [expr.add] 4038 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4039 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4040 << lex->getType() << rex->getType() 4041 << lex->getSourceRange() << rex->getSourceRange(); 4042 return QualType(); 4043 } 4044 } else { 4045 // Pointee types must be compatible C99 6.5.6p3 4046 if (!Context.typesAreCompatible( 4047 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4048 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4049 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4050 << lex->getType() << rex->getType() 4051 << lex->getSourceRange() << rex->getSourceRange(); 4052 return QualType(); 4053 } 4054 } 4055 4056 if (ComplainAboutVoid) 4057 Diag(Loc, diag::ext_gnu_void_ptr) 4058 << lex->getSourceRange() << rex->getSourceRange(); 4059 if (ComplainAboutFunc) 4060 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4061 << ComplainAboutFunc->getType() 4062 << ComplainAboutFunc->getSourceRange(); 4063 4064 if (CompLHSTy) *CompLHSTy = lex->getType(); 4065 return Context.getPointerDiffType(); 4066 } 4067 } 4068 4069 return InvalidOperands(Loc, lex, rex); 4070} 4071 4072// C99 6.5.7 4073QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4074 bool isCompAssign) { 4075 // C99 6.5.7p2: Each of the operands shall have integer type. 4076 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4077 return InvalidOperands(Loc, lex, rex); 4078 4079 // Shifts don't perform usual arithmetic conversions, they just do integer 4080 // promotions on each operand. C99 6.5.7p3 4081 QualType LHSTy; 4082 if (lex->getType()->isPromotableIntegerType()) 4083 LHSTy = Context.IntTy; 4084 else { 4085 LHSTy = isPromotableBitField(lex, Context); 4086 if (LHSTy.isNull()) 4087 LHSTy = lex->getType(); 4088 } 4089 if (!isCompAssign) 4090 ImpCastExprToType(lex, LHSTy); 4091 4092 UsualUnaryConversions(rex); 4093 4094 // "The type of the result is that of the promoted left operand." 4095 return LHSTy; 4096} 4097 4098// C99 6.5.8, C++ [expr.rel] 4099QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4100 unsigned OpaqueOpc, bool isRelational) { 4101 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4102 4103 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4104 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4105 4106 // C99 6.5.8p3 / C99 6.5.9p4 4107 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4108 UsualArithmeticConversions(lex, rex); 4109 else { 4110 UsualUnaryConversions(lex); 4111 UsualUnaryConversions(rex); 4112 } 4113 QualType lType = lex->getType(); 4114 QualType rType = rex->getType(); 4115 4116 if (!lType->isFloatingType() 4117 && !(lType->isBlockPointerType() && isRelational)) { 4118 // For non-floating point types, check for self-comparisons of the form 4119 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4120 // often indicate logic errors in the program. 4121 // NOTE: Don't warn about comparisons of enum constants. These can arise 4122 // from macro expansions, and are usually quite deliberate. 4123 Expr *LHSStripped = lex->IgnoreParens(); 4124 Expr *RHSStripped = rex->IgnoreParens(); 4125 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4126 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4127 if (DRL->getDecl() == DRR->getDecl() && 4128 !isa<EnumConstantDecl>(DRL->getDecl())) 4129 Diag(Loc, diag::warn_selfcomparison); 4130 4131 if (isa<CastExpr>(LHSStripped)) 4132 LHSStripped = LHSStripped->IgnoreParenCasts(); 4133 if (isa<CastExpr>(RHSStripped)) 4134 RHSStripped = RHSStripped->IgnoreParenCasts(); 4135 4136 // Warn about comparisons against a string constant (unless the other 4137 // operand is null), the user probably wants strcmp. 4138 Expr *literalString = 0; 4139 Expr *literalStringStripped = 0; 4140 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4141 !RHSStripped->isNullPointerConstant(Context)) { 4142 literalString = lex; 4143 literalStringStripped = LHSStripped; 4144 } 4145 else if ((isa<StringLiteral>(RHSStripped) || 4146 isa<ObjCEncodeExpr>(RHSStripped)) && 4147 !LHSStripped->isNullPointerConstant(Context)) { 4148 literalString = rex; 4149 literalStringStripped = RHSStripped; 4150 } 4151 4152 if (literalString) { 4153 std::string resultComparison; 4154 switch (Opc) { 4155 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4156 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4157 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4158 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4159 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4160 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4161 default: assert(false && "Invalid comparison operator"); 4162 } 4163 Diag(Loc, diag::warn_stringcompare) 4164 << isa<ObjCEncodeExpr>(literalStringStripped) 4165 << literalString->getSourceRange() 4166 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4167 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4168 "strcmp(") 4169 << CodeModificationHint::CreateInsertion( 4170 PP.getLocForEndOfToken(rex->getLocEnd()), 4171 resultComparison); 4172 } 4173 } 4174 4175 // The result of comparisons is 'bool' in C++, 'int' in C. 4176 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4177 4178 if (isRelational) { 4179 if (lType->isRealType() && rType->isRealType()) 4180 return ResultTy; 4181 } else { 4182 // Check for comparisons of floating point operands using != and ==. 4183 if (lType->isFloatingType()) { 4184 assert(rType->isFloatingType()); 4185 CheckFloatComparison(Loc,lex,rex); 4186 } 4187 4188 if (lType->isArithmeticType() && rType->isArithmeticType()) 4189 return ResultTy; 4190 } 4191 4192 bool LHSIsNull = lex->isNullPointerConstant(Context); 4193 bool RHSIsNull = rex->isNullPointerConstant(Context); 4194 4195 // All of the following pointer related warnings are GCC extensions, except 4196 // when handling null pointer constants. One day, we can consider making them 4197 // errors (when -pedantic-errors is enabled). 4198 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4199 QualType LCanPointeeTy = 4200 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 4201 QualType RCanPointeeTy = 4202 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 4203 4204 if (isRelational) { 4205 if (lType->isFunctionPointerType() || rType->isFunctionPointerType()) { 4206 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4207 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4208 } 4209 if (LCanPointeeTy->isVoidType() != RCanPointeeTy->isVoidType()) { 4210 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4211 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4212 } 4213 } else { 4214 if (lType->isFunctionPointerType() != rType->isFunctionPointerType()) { 4215 if (!LHSIsNull && !RHSIsNull) 4216 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4217 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4218 } 4219 } 4220 4221 // Simple check: if the pointee types are identical, we're done. 4222 if (LCanPointeeTy == RCanPointeeTy) 4223 return ResultTy; 4224 4225 if (getLangOptions().CPlusPlus) { 4226 // C++ [expr.rel]p2: 4227 // [...] Pointer conversions (4.10) and qualification 4228 // conversions (4.4) are performed on pointer operands (or on 4229 // a pointer operand and a null pointer constant) to bring 4230 // them to their composite pointer type. [...] 4231 // 4232 // C++ [expr.eq]p2 uses the same notion for (in)equality 4233 // comparisons of pointers. 4234 QualType T = FindCompositePointerType(lex, rex); 4235 if (T.isNull()) { 4236 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4237 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4238 return QualType(); 4239 } 4240 4241 ImpCastExprToType(lex, T); 4242 ImpCastExprToType(rex, T); 4243 return ResultTy; 4244 } 4245 4246 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 4247 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 4248 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4249 RCanPointeeTy.getUnqualifiedType())) { 4250 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4251 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4252 } 4253 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4254 return ResultTy; 4255 } 4256 // C++ allows comparison of pointers with null pointer constants. 4257 if (getLangOptions().CPlusPlus) { 4258 if (lType->isPointerType() && RHSIsNull) { 4259 ImpCastExprToType(rex, lType); 4260 return ResultTy; 4261 } 4262 if (rType->isPointerType() && LHSIsNull) { 4263 ImpCastExprToType(lex, rType); 4264 return ResultTy; 4265 } 4266 // And comparison of nullptr_t with itself. 4267 if (lType->isNullPtrType() && rType->isNullPtrType()) 4268 return ResultTy; 4269 } 4270 // Handle block pointer types. 4271 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4272 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 4273 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 4274 4275 if (!LHSIsNull && !RHSIsNull && 4276 !Context.typesAreCompatible(lpointee, rpointee)) { 4277 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4278 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4279 } 4280 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4281 return ResultTy; 4282 } 4283 // Allow block pointers to be compared with null pointer constants. 4284 if (!isRelational 4285 && ((lType->isBlockPointerType() && rType->isPointerType()) 4286 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4287 if (!LHSIsNull && !RHSIsNull) { 4288 if (!((rType->isPointerType() && rType->getAsPointerType() 4289 ->getPointeeType()->isVoidType()) 4290 || (lType->isPointerType() && lType->getAsPointerType() 4291 ->getPointeeType()->isVoidType()))) 4292 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4293 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4294 } 4295 ImpCastExprToType(rex, lType); // promote the pointer to pointer 4296 return ResultTy; 4297 } 4298 4299 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4300 if (lType->isPointerType() || rType->isPointerType()) { 4301 const PointerType *LPT = lType->getAsPointerType(); 4302 const PointerType *RPT = rType->getAsPointerType(); 4303 bool LPtrToVoid = LPT ? 4304 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4305 bool RPtrToVoid = RPT ? 4306 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4307 4308 if (!LPtrToVoid && !RPtrToVoid && 4309 !Context.typesAreCompatible(lType, rType)) { 4310 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4311 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4312 } 4313 ImpCastExprToType(rex, lType); 4314 return ResultTy; 4315 } 4316 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4317 if (!Context.areComparableObjCPointerTypes(lType, rType)) { 4318 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4319 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4320 } 4321 ImpCastExprToType(rex, lType); 4322 return ResultTy; 4323 } 4324 } 4325 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4326 if (isRelational) 4327 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4328 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4329 else if (!RHSIsNull) 4330 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4331 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4332 ImpCastExprToType(rex, lType); // promote the integer to pointer 4333 return ResultTy; 4334 } 4335 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4336 if (isRelational) 4337 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_pointer_integer) 4338 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4339 else if (!LHSIsNull) 4340 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 4341 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4342 ImpCastExprToType(lex, rType); // promote the integer to pointer 4343 return ResultTy; 4344 } 4345 // Handle block pointers. 4346 if (!isRelational && RHSIsNull 4347 && lType->isBlockPointerType() && rType->isIntegerType()) { 4348 ImpCastExprToType(rex, lType); // promote the integer to pointer 4349 return ResultTy; 4350 } 4351 if (!isRelational && LHSIsNull 4352 && lType->isIntegerType() && rType->isBlockPointerType()) { 4353 ImpCastExprToType(lex, rType); // promote the integer to pointer 4354 return ResultTy; 4355 } 4356 return InvalidOperands(Loc, lex, rex); 4357} 4358 4359/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4360/// operates on extended vector types. Instead of producing an IntTy result, 4361/// like a scalar comparison, a vector comparison produces a vector of integer 4362/// types. 4363QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4364 SourceLocation Loc, 4365 bool isRelational) { 4366 // Check to make sure we're operating on vectors of the same type and width, 4367 // Allowing one side to be a scalar of element type. 4368 QualType vType = CheckVectorOperands(Loc, lex, rex); 4369 if (vType.isNull()) 4370 return vType; 4371 4372 QualType lType = lex->getType(); 4373 QualType rType = rex->getType(); 4374 4375 // For non-floating point types, check for self-comparisons of the form 4376 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4377 // often indicate logic errors in the program. 4378 if (!lType->isFloatingType()) { 4379 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4380 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4381 if (DRL->getDecl() == DRR->getDecl()) 4382 Diag(Loc, diag::warn_selfcomparison); 4383 } 4384 4385 // Check for comparisons of floating point operands using != and ==. 4386 if (!isRelational && lType->isFloatingType()) { 4387 assert (rType->isFloatingType()); 4388 CheckFloatComparison(Loc,lex,rex); 4389 } 4390 4391 // Return the type for the comparison, which is the same as vector type for 4392 // integer vectors, or an integer type of identical size and number of 4393 // elements for floating point vectors. 4394 if (lType->isIntegerType()) 4395 return lType; 4396 4397 const VectorType *VTy = lType->getAsVectorType(); 4398 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4399 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4400 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4401 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4402 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4403 4404 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4405 "Unhandled vector element size in vector compare"); 4406 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4407} 4408 4409inline QualType Sema::CheckBitwiseOperands( 4410 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 4411{ 4412 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4413 return CheckVectorOperands(Loc, lex, rex); 4414 4415 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4416 4417 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4418 return compType; 4419 return InvalidOperands(Loc, lex, rex); 4420} 4421 4422inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4423 Expr *&lex, Expr *&rex, SourceLocation Loc) 4424{ 4425 UsualUnaryConversions(lex); 4426 UsualUnaryConversions(rex); 4427 4428 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 4429 return Context.IntTy; 4430 return InvalidOperands(Loc, lex, rex); 4431} 4432 4433/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4434/// is a read-only property; return true if so. A readonly property expression 4435/// depends on various declarations and thus must be treated specially. 4436/// 4437static bool IsReadonlyProperty(Expr *E, Sema &S) 4438{ 4439 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4440 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4441 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4442 QualType BaseType = PropExpr->getBase()->getType(); 4443 if (const ObjCObjectPointerType *OPT = 4444 BaseType->getAsObjCInterfacePointerType()) 4445 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4446 if (S.isPropertyReadonly(PDecl, IFace)) 4447 return true; 4448 } 4449 } 4450 return false; 4451} 4452 4453/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4454/// emit an error and return true. If so, return false. 4455static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4456 SourceLocation OrigLoc = Loc; 4457 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4458 &Loc); 4459 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4460 IsLV = Expr::MLV_ReadonlyProperty; 4461 if (IsLV == Expr::MLV_Valid) 4462 return false; 4463 4464 unsigned Diag = 0; 4465 bool NeedType = false; 4466 switch (IsLV) { // C99 6.5.16p2 4467 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4468 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4469 case Expr::MLV_ArrayType: 4470 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4471 NeedType = true; 4472 break; 4473 case Expr::MLV_NotObjectType: 4474 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4475 NeedType = true; 4476 break; 4477 case Expr::MLV_LValueCast: 4478 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4479 break; 4480 case Expr::MLV_InvalidExpression: 4481 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4482 break; 4483 case Expr::MLV_IncompleteType: 4484 case Expr::MLV_IncompleteVoidType: 4485 return S.RequireCompleteType(Loc, E->getType(), 4486 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 4487 E->getSourceRange()); 4488 case Expr::MLV_DuplicateVectorComponents: 4489 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4490 break; 4491 case Expr::MLV_NotBlockQualified: 4492 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4493 break; 4494 case Expr::MLV_ReadonlyProperty: 4495 Diag = diag::error_readonly_property_assignment; 4496 break; 4497 case Expr::MLV_NoSetterProperty: 4498 Diag = diag::error_nosetter_property_assignment; 4499 break; 4500 } 4501 4502 SourceRange Assign; 4503 if (Loc != OrigLoc) 4504 Assign = SourceRange(OrigLoc, OrigLoc); 4505 if (NeedType) 4506 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4507 else 4508 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4509 return true; 4510} 4511 4512 4513 4514// C99 6.5.16.1 4515QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4516 SourceLocation Loc, 4517 QualType CompoundType) { 4518 // Verify that LHS is a modifiable lvalue, and emit error if not. 4519 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4520 return QualType(); 4521 4522 QualType LHSType = LHS->getType(); 4523 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4524 4525 AssignConvertType ConvTy; 4526 if (CompoundType.isNull()) { 4527 // Simple assignment "x = y". 4528 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4529 // Special case of NSObject attributes on c-style pointer types. 4530 if (ConvTy == IncompatiblePointer && 4531 ((Context.isObjCNSObjectType(LHSType) && 4532 RHSType->isObjCObjectPointerType()) || 4533 (Context.isObjCNSObjectType(RHSType) && 4534 LHSType->isObjCObjectPointerType()))) 4535 ConvTy = Compatible; 4536 4537 // If the RHS is a unary plus or minus, check to see if they = and + are 4538 // right next to each other. If so, the user may have typo'd "x =+ 4" 4539 // instead of "x += 4". 4540 Expr *RHSCheck = RHS; 4541 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4542 RHSCheck = ICE->getSubExpr(); 4543 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4544 if ((UO->getOpcode() == UnaryOperator::Plus || 4545 UO->getOpcode() == UnaryOperator::Minus) && 4546 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4547 // Only if the two operators are exactly adjacent. 4548 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4549 // And there is a space or other character before the subexpr of the 4550 // unary +/-. We don't want to warn on "x=-1". 4551 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4552 UO->getSubExpr()->getLocStart().isFileID()) { 4553 Diag(Loc, diag::warn_not_compound_assign) 4554 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4555 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4556 } 4557 } 4558 } else { 4559 // Compound assignment "x += y" 4560 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4561 } 4562 4563 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4564 RHS, "assigning")) 4565 return QualType(); 4566 4567 // C99 6.5.16p3: The type of an assignment expression is the type of the 4568 // left operand unless the left operand has qualified type, in which case 4569 // it is the unqualified version of the type of the left operand. 4570 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4571 // is converted to the type of the assignment expression (above). 4572 // C++ 5.17p1: the type of the assignment expression is that of its left 4573 // operand. 4574 return LHSType.getUnqualifiedType(); 4575} 4576 4577// C99 6.5.17 4578QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4579 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4580 DefaultFunctionArrayConversion(RHS); 4581 4582 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4583 // incomplete in C++). 4584 4585 return RHS->getType(); 4586} 4587 4588/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4589/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4590QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4591 bool isInc) { 4592 if (Op->isTypeDependent()) 4593 return Context.DependentTy; 4594 4595 QualType ResType = Op->getType(); 4596 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4597 4598 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4599 // Decrement of bool is not allowed. 4600 if (!isInc) { 4601 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4602 return QualType(); 4603 } 4604 // Increment of bool sets it to true, but is deprecated. 4605 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4606 } else if (ResType->isRealType()) { 4607 // OK! 4608 } else if (ResType->isAnyPointerType()) { 4609 QualType PointeeTy = ResType->getPointeeType(); 4610 4611 // C99 6.5.2.4p2, 6.5.6p2 4612 if (PointeeTy->isVoidType()) { 4613 if (getLangOptions().CPlusPlus) { 4614 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4615 << Op->getSourceRange(); 4616 return QualType(); 4617 } 4618 4619 // Pointer to void is a GNU extension in C. 4620 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 4621 } else if (PointeeTy->isFunctionType()) { 4622 if (getLangOptions().CPlusPlus) { 4623 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 4624 << Op->getType() << Op->getSourceRange(); 4625 return QualType(); 4626 } 4627 4628 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 4629 << ResType << Op->getSourceRange(); 4630 } else if (RequireCompleteType(OpLoc, PointeeTy, 4631 diag::err_typecheck_arithmetic_incomplete_type, 4632 Op->getSourceRange(), SourceRange(), 4633 ResType)) 4634 return QualType(); 4635 // Diagnose bad cases where we step over interface counts. 4636 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4637 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 4638 << PointeeTy << Op->getSourceRange(); 4639 return QualType(); 4640 } 4641 } else if (ResType->isComplexType()) { 4642 // C99 does not support ++/-- on complex types, we allow as an extension. 4643 Diag(OpLoc, diag::ext_integer_increment_complex) 4644 << ResType << Op->getSourceRange(); 4645 } else { 4646 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 4647 << ResType << Op->getSourceRange(); 4648 return QualType(); 4649 } 4650 // At this point, we know we have a real, complex or pointer type. 4651 // Now make sure the operand is a modifiable lvalue. 4652 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 4653 return QualType(); 4654 return ResType; 4655} 4656 4657/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 4658/// This routine allows us to typecheck complex/recursive expressions 4659/// where the declaration is needed for type checking. We only need to 4660/// handle cases when the expression references a function designator 4661/// or is an lvalue. Here are some examples: 4662/// - &(x) => x 4663/// - &*****f => f for f a function designator. 4664/// - &s.xx => s 4665/// - &s.zz[1].yy -> s, if zz is an array 4666/// - *(x + 1) -> x, if x is an array 4667/// - &"123"[2] -> 0 4668/// - & __real__ x -> x 4669static NamedDecl *getPrimaryDecl(Expr *E) { 4670 switch (E->getStmtClass()) { 4671 case Stmt::DeclRefExprClass: 4672 case Stmt::QualifiedDeclRefExprClass: 4673 return cast<DeclRefExpr>(E)->getDecl(); 4674 case Stmt::MemberExprClass: 4675 // If this is an arrow operator, the address is an offset from 4676 // the base's value, so the object the base refers to is 4677 // irrelevant. 4678 if (cast<MemberExpr>(E)->isArrow()) 4679 return 0; 4680 // Otherwise, the expression refers to a part of the base 4681 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4682 case Stmt::ArraySubscriptExprClass: { 4683 // FIXME: This code shouldn't be necessary! We should catch the implicit 4684 // promotion of register arrays earlier. 4685 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4686 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4687 if (ICE->getSubExpr()->getType()->isArrayType()) 4688 return getPrimaryDecl(ICE->getSubExpr()); 4689 } 4690 return 0; 4691 } 4692 case Stmt::UnaryOperatorClass: { 4693 UnaryOperator *UO = cast<UnaryOperator>(E); 4694 4695 switch(UO->getOpcode()) { 4696 case UnaryOperator::Real: 4697 case UnaryOperator::Imag: 4698 case UnaryOperator::Extension: 4699 return getPrimaryDecl(UO->getSubExpr()); 4700 default: 4701 return 0; 4702 } 4703 } 4704 case Stmt::ParenExprClass: 4705 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4706 case Stmt::ImplicitCastExprClass: 4707 // If the result of an implicit cast is an l-value, we care about 4708 // the sub-expression; otherwise, the result here doesn't matter. 4709 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4710 default: 4711 return 0; 4712 } 4713} 4714 4715/// CheckAddressOfOperand - The operand of & must be either a function 4716/// designator or an lvalue designating an object. If it is an lvalue, the 4717/// object cannot be declared with storage class register or be a bit field. 4718/// Note: The usual conversions are *not* applied to the operand of the & 4719/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4720/// In C++, the operand might be an overloaded function name, in which case 4721/// we allow the '&' but retain the overloaded-function type. 4722QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4723 // Make sure to ignore parentheses in subsequent checks 4724 op = op->IgnoreParens(); 4725 4726 if (op->isTypeDependent()) 4727 return Context.DependentTy; 4728 4729 if (getLangOptions().C99) { 4730 // Implement C99-only parts of addressof rules. 4731 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4732 if (uOp->getOpcode() == UnaryOperator::Deref) 4733 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4734 // (assuming the deref expression is valid). 4735 return uOp->getSubExpr()->getType(); 4736 } 4737 // Technically, there should be a check for array subscript 4738 // expressions here, but the result of one is always an lvalue anyway. 4739 } 4740 NamedDecl *dcl = getPrimaryDecl(op); 4741 Expr::isLvalueResult lval = op->isLvalue(Context); 4742 4743 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 4744 // C99 6.5.3.2p1 4745 // The operand must be either an l-value or a function designator 4746 if (!op->getType()->isFunctionType()) { 4747 // FIXME: emit more specific diag... 4748 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4749 << op->getSourceRange(); 4750 return QualType(); 4751 } 4752 } else if (op->getBitField()) { // C99 6.5.3.2p1 4753 // The operand cannot be a bit-field 4754 Diag(OpLoc, diag::err_typecheck_address_of) 4755 << "bit-field" << op->getSourceRange(); 4756 return QualType(); 4757 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4758 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4759 // The operand cannot be an element of a vector 4760 Diag(OpLoc, diag::err_typecheck_address_of) 4761 << "vector element" << op->getSourceRange(); 4762 return QualType(); 4763 } else if (isa<ObjCPropertyRefExpr>(op)) { 4764 // cannot take address of a property expression. 4765 Diag(OpLoc, diag::err_typecheck_address_of) 4766 << "property expression" << op->getSourceRange(); 4767 return QualType(); 4768 } else if (dcl) { // C99 6.5.3.2p1 4769 // We have an lvalue with a decl. Make sure the decl is not declared 4770 // with the register storage-class specifier. 4771 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4772 if (vd->getStorageClass() == VarDecl::Register) { 4773 Diag(OpLoc, diag::err_typecheck_address_of) 4774 << "register variable" << op->getSourceRange(); 4775 return QualType(); 4776 } 4777 } else if (isa<OverloadedFunctionDecl>(dcl) || 4778 isa<FunctionTemplateDecl>(dcl)) { 4779 return Context.OverloadTy; 4780 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 4781 // Okay: we can take the address of a field. 4782 // Could be a pointer to member, though, if there is an explicit 4783 // scope qualifier for the class. 4784 if (isa<QualifiedDeclRefExpr>(op)) { 4785 DeclContext *Ctx = dcl->getDeclContext(); 4786 if (Ctx && Ctx->isRecord()) { 4787 if (FD->getType()->isReferenceType()) { 4788 Diag(OpLoc, 4789 diag::err_cannot_form_pointer_to_member_of_reference_type) 4790 << FD->getDeclName() << FD->getType(); 4791 return QualType(); 4792 } 4793 4794 return Context.getMemberPointerType(op->getType(), 4795 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4796 } 4797 } 4798 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 4799 // Okay: we can take the address of a function. 4800 // As above. 4801 if (isa<QualifiedDeclRefExpr>(op) && MD->isInstance()) 4802 return Context.getMemberPointerType(op->getType(), 4803 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 4804 } else if (!isa<FunctionDecl>(dcl)) 4805 assert(0 && "Unknown/unexpected decl type"); 4806 } 4807 4808 if (lval == Expr::LV_IncompleteVoidType) { 4809 // Taking the address of a void variable is technically illegal, but we 4810 // allow it in cases which are otherwise valid. 4811 // Example: "extern void x; void* y = &x;". 4812 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 4813 } 4814 4815 // If the operand has type "type", the result has type "pointer to type". 4816 return Context.getPointerType(op->getType()); 4817} 4818 4819QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4820 if (Op->isTypeDependent()) 4821 return Context.DependentTy; 4822 4823 UsualUnaryConversions(Op); 4824 QualType Ty = Op->getType(); 4825 4826 // Note that per both C89 and C99, this is always legal, even if ptype is an 4827 // incomplete type or void. It would be possible to warn about dereferencing 4828 // a void pointer, but it's completely well-defined, and such a warning is 4829 // unlikely to catch any mistakes. 4830 if (const PointerType *PT = Ty->getAsPointerType()) 4831 return PT->getPointeeType(); 4832 4833 if (const ObjCObjectPointerType *OPT = Ty->getAsObjCObjectPointerType()) 4834 return OPT->getPointeeType(); 4835 4836 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4837 << Ty << Op->getSourceRange(); 4838 return QualType(); 4839} 4840 4841static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4842 tok::TokenKind Kind) { 4843 BinaryOperator::Opcode Opc; 4844 switch (Kind) { 4845 default: assert(0 && "Unknown binop!"); 4846 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4847 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4848 case tok::star: Opc = BinaryOperator::Mul; break; 4849 case tok::slash: Opc = BinaryOperator::Div; break; 4850 case tok::percent: Opc = BinaryOperator::Rem; break; 4851 case tok::plus: Opc = BinaryOperator::Add; break; 4852 case tok::minus: Opc = BinaryOperator::Sub; break; 4853 case tok::lessless: Opc = BinaryOperator::Shl; break; 4854 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4855 case tok::lessequal: Opc = BinaryOperator::LE; break; 4856 case tok::less: Opc = BinaryOperator::LT; break; 4857 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4858 case tok::greater: Opc = BinaryOperator::GT; break; 4859 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4860 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4861 case tok::amp: Opc = BinaryOperator::And; break; 4862 case tok::caret: Opc = BinaryOperator::Xor; break; 4863 case tok::pipe: Opc = BinaryOperator::Or; break; 4864 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4865 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4866 case tok::equal: Opc = BinaryOperator::Assign; break; 4867 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4868 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4869 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4870 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4871 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4872 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4873 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4874 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4875 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4876 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4877 case tok::comma: Opc = BinaryOperator::Comma; break; 4878 } 4879 return Opc; 4880} 4881 4882static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4883 tok::TokenKind Kind) { 4884 UnaryOperator::Opcode Opc; 4885 switch (Kind) { 4886 default: assert(0 && "Unknown unary op!"); 4887 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4888 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4889 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4890 case tok::star: Opc = UnaryOperator::Deref; break; 4891 case tok::plus: Opc = UnaryOperator::Plus; break; 4892 case tok::minus: Opc = UnaryOperator::Minus; break; 4893 case tok::tilde: Opc = UnaryOperator::Not; break; 4894 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4895 case tok::kw___real: Opc = UnaryOperator::Real; break; 4896 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4897 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4898 } 4899 return Opc; 4900} 4901 4902/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4903/// operator @p Opc at location @c TokLoc. This routine only supports 4904/// built-in operations; ActOnBinOp handles overloaded operators. 4905Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4906 unsigned Op, 4907 Expr *lhs, Expr *rhs) { 4908 QualType ResultTy; // Result type of the binary operator. 4909 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4910 // The following two variables are used for compound assignment operators 4911 QualType CompLHSTy; // Type of LHS after promotions for computation 4912 QualType CompResultTy; // Type of computation result 4913 4914 switch (Opc) { 4915 case BinaryOperator::Assign: 4916 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4917 break; 4918 case BinaryOperator::PtrMemD: 4919 case BinaryOperator::PtrMemI: 4920 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4921 Opc == BinaryOperator::PtrMemI); 4922 break; 4923 case BinaryOperator::Mul: 4924 case BinaryOperator::Div: 4925 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4926 break; 4927 case BinaryOperator::Rem: 4928 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4929 break; 4930 case BinaryOperator::Add: 4931 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4932 break; 4933 case BinaryOperator::Sub: 4934 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4935 break; 4936 case BinaryOperator::Shl: 4937 case BinaryOperator::Shr: 4938 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4939 break; 4940 case BinaryOperator::LE: 4941 case BinaryOperator::LT: 4942 case BinaryOperator::GE: 4943 case BinaryOperator::GT: 4944 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4945 break; 4946 case BinaryOperator::EQ: 4947 case BinaryOperator::NE: 4948 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4949 break; 4950 case BinaryOperator::And: 4951 case BinaryOperator::Xor: 4952 case BinaryOperator::Or: 4953 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4954 break; 4955 case BinaryOperator::LAnd: 4956 case BinaryOperator::LOr: 4957 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4958 break; 4959 case BinaryOperator::MulAssign: 4960 case BinaryOperator::DivAssign: 4961 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4962 CompLHSTy = CompResultTy; 4963 if (!CompResultTy.isNull()) 4964 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4965 break; 4966 case BinaryOperator::RemAssign: 4967 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4968 CompLHSTy = CompResultTy; 4969 if (!CompResultTy.isNull()) 4970 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4971 break; 4972 case BinaryOperator::AddAssign: 4973 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4974 if (!CompResultTy.isNull()) 4975 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4976 break; 4977 case BinaryOperator::SubAssign: 4978 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4979 if (!CompResultTy.isNull()) 4980 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4981 break; 4982 case BinaryOperator::ShlAssign: 4983 case BinaryOperator::ShrAssign: 4984 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4985 CompLHSTy = CompResultTy; 4986 if (!CompResultTy.isNull()) 4987 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4988 break; 4989 case BinaryOperator::AndAssign: 4990 case BinaryOperator::XorAssign: 4991 case BinaryOperator::OrAssign: 4992 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4993 CompLHSTy = CompResultTy; 4994 if (!CompResultTy.isNull()) 4995 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4996 break; 4997 case BinaryOperator::Comma: 4998 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4999 break; 5000 } 5001 if (ResultTy.isNull()) 5002 return ExprError(); 5003 if (CompResultTy.isNull()) 5004 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5005 else 5006 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5007 CompLHSTy, CompResultTy, 5008 OpLoc)); 5009} 5010 5011// Binary Operators. 'Tok' is the token for the operator. 5012Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5013 tok::TokenKind Kind, 5014 ExprArg LHS, ExprArg RHS) { 5015 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5016 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5017 5018 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5019 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5020 5021 if (getLangOptions().CPlusPlus && 5022 (lhs->getType()->isOverloadableType() || 5023 rhs->getType()->isOverloadableType())) { 5024 // Find all of the overloaded operators visible from this 5025 // point. We perform both an operator-name lookup from the local 5026 // scope and an argument-dependent lookup based on the types of 5027 // the arguments. 5028 FunctionSet Functions; 5029 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5030 if (OverOp != OO_None) { 5031 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5032 Functions); 5033 Expr *Args[2] = { lhs, rhs }; 5034 DeclarationName OpName 5035 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5036 ArgumentDependentLookup(OpName, Args, 2, Functions); 5037 } 5038 5039 // Build the (potentially-overloaded, potentially-dependent) 5040 // binary operation. 5041 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5042 } 5043 5044 // Build a built-in binary operation. 5045 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5046} 5047 5048Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5049 unsigned OpcIn, 5050 ExprArg InputArg) { 5051 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5052 5053 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5054 Expr *Input = (Expr *)InputArg.get(); 5055 QualType resultType; 5056 switch (Opc) { 5057 case UnaryOperator::OffsetOf: 5058 assert(false && "Invalid unary operator"); 5059 break; 5060 5061 case UnaryOperator::PreInc: 5062 case UnaryOperator::PreDec: 5063 case UnaryOperator::PostInc: 5064 case UnaryOperator::PostDec: 5065 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5066 Opc == UnaryOperator::PreInc || 5067 Opc == UnaryOperator::PostInc); 5068 break; 5069 case UnaryOperator::AddrOf: 5070 resultType = CheckAddressOfOperand(Input, OpLoc); 5071 break; 5072 case UnaryOperator::Deref: 5073 DefaultFunctionArrayConversion(Input); 5074 resultType = CheckIndirectionOperand(Input, OpLoc); 5075 break; 5076 case UnaryOperator::Plus: 5077 case UnaryOperator::Minus: 5078 UsualUnaryConversions(Input); 5079 resultType = Input->getType(); 5080 if (resultType->isDependentType()) 5081 break; 5082 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5083 break; 5084 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5085 resultType->isEnumeralType()) 5086 break; 5087 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5088 Opc == UnaryOperator::Plus && 5089 resultType->isPointerType()) 5090 break; 5091 5092 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5093 << resultType << Input->getSourceRange()); 5094 case UnaryOperator::Not: // bitwise complement 5095 UsualUnaryConversions(Input); 5096 resultType = Input->getType(); 5097 if (resultType->isDependentType()) 5098 break; 5099 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5100 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5101 // C99 does not support '~' for complex conjugation. 5102 Diag(OpLoc, diag::ext_integer_complement_complex) 5103 << resultType << Input->getSourceRange(); 5104 else if (!resultType->isIntegerType()) 5105 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5106 << resultType << Input->getSourceRange()); 5107 break; 5108 case UnaryOperator::LNot: // logical negation 5109 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5110 DefaultFunctionArrayConversion(Input); 5111 resultType = Input->getType(); 5112 if (resultType->isDependentType()) 5113 break; 5114 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5115 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5116 << resultType << Input->getSourceRange()); 5117 // LNot always has type int. C99 6.5.3.3p5. 5118 // In C++, it's bool. C++ 5.3.1p8 5119 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5120 break; 5121 case UnaryOperator::Real: 5122 case UnaryOperator::Imag: 5123 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5124 break; 5125 case UnaryOperator::Extension: 5126 resultType = Input->getType(); 5127 break; 5128 } 5129 if (resultType.isNull()) 5130 return ExprError(); 5131 5132 InputArg.release(); 5133 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5134} 5135 5136// Unary Operators. 'Tok' is the token for the operator. 5137Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5138 tok::TokenKind Op, ExprArg input) { 5139 Expr *Input = (Expr*)input.get(); 5140 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5141 5142 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5143 // Find all of the overloaded operators visible from this 5144 // point. We perform both an operator-name lookup from the local 5145 // scope and an argument-dependent lookup based on the types of 5146 // the arguments. 5147 FunctionSet Functions; 5148 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5149 if (OverOp != OO_None) { 5150 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5151 Functions); 5152 DeclarationName OpName 5153 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5154 ArgumentDependentLookup(OpName, &Input, 1, Functions); 5155 } 5156 5157 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5158 } 5159 5160 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5161} 5162 5163/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5164Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5165 SourceLocation LabLoc, 5166 IdentifierInfo *LabelII) { 5167 // Look up the record for this label identifier. 5168 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5169 5170 // If we haven't seen this label yet, create a forward reference. It 5171 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5172 if (LabelDecl == 0) 5173 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5174 5175 // Create the AST node. The address of a label always has type 'void*'. 5176 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5177 Context.getPointerType(Context.VoidTy))); 5178} 5179 5180Sema::OwningExprResult 5181Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5182 SourceLocation RPLoc) { // "({..})" 5183 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5184 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5185 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5186 5187 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5188 if (isFileScope) 5189 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5190 5191 // FIXME: there are a variety of strange constraints to enforce here, for 5192 // example, it is not possible to goto into a stmt expression apparently. 5193 // More semantic analysis is needed. 5194 5195 // If there are sub stmts in the compound stmt, take the type of the last one 5196 // as the type of the stmtexpr. 5197 QualType Ty = Context.VoidTy; 5198 5199 if (!Compound->body_empty()) { 5200 Stmt *LastStmt = Compound->body_back(); 5201 // If LastStmt is a label, skip down through into the body. 5202 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5203 LastStmt = Label->getSubStmt(); 5204 5205 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5206 Ty = LastExpr->getType(); 5207 } 5208 5209 // FIXME: Check that expression type is complete/non-abstract; statement 5210 // expressions are not lvalues. 5211 5212 substmt.release(); 5213 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5214} 5215 5216Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5217 SourceLocation BuiltinLoc, 5218 SourceLocation TypeLoc, 5219 TypeTy *argty, 5220 OffsetOfComponent *CompPtr, 5221 unsigned NumComponents, 5222 SourceLocation RPLoc) { 5223 // FIXME: This function leaks all expressions in the offset components on 5224 // error. 5225 QualType ArgTy = QualType::getFromOpaquePtr(argty); 5226 assert(!ArgTy.isNull() && "Missing type argument!"); 5227 5228 bool Dependent = ArgTy->isDependentType(); 5229 5230 // We must have at least one component that refers to the type, and the first 5231 // one is known to be a field designator. Verify that the ArgTy represents 5232 // a struct/union/class. 5233 if (!Dependent && !ArgTy->isRecordType()) 5234 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5235 5236 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5237 // with an incomplete type would be illegal. 5238 5239 // Otherwise, create a null pointer as the base, and iteratively process 5240 // the offsetof designators. 5241 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5242 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5243 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5244 ArgTy, SourceLocation()); 5245 5246 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5247 // GCC extension, diagnose them. 5248 // FIXME: This diagnostic isn't actually visible because the location is in 5249 // a system header! 5250 if (NumComponents != 1) 5251 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5252 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5253 5254 if (!Dependent) { 5255 bool DidWarnAboutNonPOD = false; 5256 5257 // FIXME: Dependent case loses a lot of information here. And probably 5258 // leaks like a sieve. 5259 for (unsigned i = 0; i != NumComponents; ++i) { 5260 const OffsetOfComponent &OC = CompPtr[i]; 5261 if (OC.isBrackets) { 5262 // Offset of an array sub-field. TODO: Should we allow vector elements? 5263 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5264 if (!AT) { 5265 Res->Destroy(Context); 5266 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5267 << Res->getType()); 5268 } 5269 5270 // FIXME: C++: Verify that operator[] isn't overloaded. 5271 5272 // Promote the array so it looks more like a normal array subscript 5273 // expression. 5274 DefaultFunctionArrayConversion(Res); 5275 5276 // C99 6.5.2.1p1 5277 Expr *Idx = static_cast<Expr*>(OC.U.E); 5278 // FIXME: Leaks Res 5279 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5280 return ExprError(Diag(Idx->getLocStart(), 5281 diag::err_typecheck_subscript_not_integer) 5282 << Idx->getSourceRange()); 5283 5284 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5285 OC.LocEnd); 5286 continue; 5287 } 5288 5289 const RecordType *RC = Res->getType()->getAsRecordType(); 5290 if (!RC) { 5291 Res->Destroy(Context); 5292 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5293 << Res->getType()); 5294 } 5295 5296 // Get the decl corresponding to this. 5297 RecordDecl *RD = RC->getDecl(); 5298 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5299 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5300 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5301 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5302 << Res->getType()); 5303 DidWarnAboutNonPOD = true; 5304 } 5305 } 5306 5307 FieldDecl *MemberDecl 5308 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 5309 LookupMemberName) 5310 .getAsDecl()); 5311 // FIXME: Leaks Res 5312 if (!MemberDecl) 5313 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 5314 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 5315 5316 // FIXME: C++: Verify that MemberDecl isn't a static field. 5317 // FIXME: Verify that MemberDecl isn't a bitfield. 5318 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5319 Res = BuildAnonymousStructUnionMemberReference( 5320 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5321 } else { 5322 // MemberDecl->getType() doesn't get the right qualifiers, but it 5323 // doesn't matter here. 5324 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5325 MemberDecl->getType().getNonReferenceType()); 5326 } 5327 } 5328 } 5329 5330 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5331 Context.getSizeType(), BuiltinLoc)); 5332} 5333 5334 5335Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5336 TypeTy *arg1,TypeTy *arg2, 5337 SourceLocation RPLoc) { 5338 QualType argT1 = QualType::getFromOpaquePtr(arg1); 5339 QualType argT2 = QualType::getFromOpaquePtr(arg2); 5340 5341 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5342 5343 if (getLangOptions().CPlusPlus) { 5344 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5345 << SourceRange(BuiltinLoc, RPLoc); 5346 return ExprError(); 5347 } 5348 5349 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5350 argT1, argT2, RPLoc)); 5351} 5352 5353Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5354 ExprArg cond, 5355 ExprArg expr1, ExprArg expr2, 5356 SourceLocation RPLoc) { 5357 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5358 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5359 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5360 5361 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5362 5363 QualType resType; 5364 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5365 resType = Context.DependentTy; 5366 } else { 5367 // The conditional expression is required to be a constant expression. 5368 llvm::APSInt condEval(32); 5369 SourceLocation ExpLoc; 5370 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5371 return ExprError(Diag(ExpLoc, 5372 diag::err_typecheck_choose_expr_requires_constant) 5373 << CondExpr->getSourceRange()); 5374 5375 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5376 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5377 } 5378 5379 cond.release(); expr1.release(); expr2.release(); 5380 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5381 resType, RPLoc)); 5382} 5383 5384//===----------------------------------------------------------------------===// 5385// Clang Extensions. 5386//===----------------------------------------------------------------------===// 5387 5388/// ActOnBlockStart - This callback is invoked when a block literal is started. 5389void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5390 // Analyze block parameters. 5391 BlockSemaInfo *BSI = new BlockSemaInfo(); 5392 5393 // Add BSI to CurBlock. 5394 BSI->PrevBlockInfo = CurBlock; 5395 CurBlock = BSI; 5396 5397 BSI->ReturnType = QualType(); 5398 BSI->TheScope = BlockScope; 5399 BSI->hasBlockDeclRefExprs = false; 5400 BSI->hasPrototype = false; 5401 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5402 CurFunctionNeedsScopeChecking = false; 5403 5404 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5405 PushDeclContext(BlockScope, BSI->TheDecl); 5406} 5407 5408void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5409 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5410 5411 if (ParamInfo.getNumTypeObjects() == 0 5412 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5413 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5414 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5415 5416 if (T->isArrayType()) { 5417 Diag(ParamInfo.getSourceRange().getBegin(), 5418 diag::err_block_returns_array); 5419 return; 5420 } 5421 5422 // The parameter list is optional, if there was none, assume (). 5423 if (!T->isFunctionType()) 5424 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5425 5426 CurBlock->hasPrototype = true; 5427 CurBlock->isVariadic = false; 5428 // Check for a valid sentinel attribute on this block. 5429 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5430 Diag(ParamInfo.getAttributes()->getLoc(), 5431 diag::warn_attribute_sentinel_not_variadic) << 1; 5432 // FIXME: remove the attribute. 5433 } 5434 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 5435 5436 // Do not allow returning a objc interface by-value. 5437 if (RetTy->isObjCInterfaceType()) { 5438 Diag(ParamInfo.getSourceRange().getBegin(), 5439 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5440 return; 5441 } 5442 return; 5443 } 5444 5445 // Analyze arguments to block. 5446 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5447 "Not a function declarator!"); 5448 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5449 5450 CurBlock->hasPrototype = FTI.hasPrototype; 5451 CurBlock->isVariadic = true; 5452 5453 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5454 // no arguments, not a function that takes a single void argument. 5455 if (FTI.hasPrototype && 5456 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5457 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5458 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5459 // empty arg list, don't push any params. 5460 CurBlock->isVariadic = false; 5461 } else if (FTI.hasPrototype) { 5462 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5463 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5464 CurBlock->isVariadic = FTI.isVariadic; 5465 } 5466 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5467 CurBlock->Params.size()); 5468 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5469 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5470 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5471 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5472 // If this has an identifier, add it to the scope stack. 5473 if ((*AI)->getIdentifier()) 5474 PushOnScopeChains(*AI, CurBlock->TheScope); 5475 5476 // Check for a valid sentinel attribute on this block. 5477 if (!CurBlock->isVariadic && 5478 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5479 Diag(ParamInfo.getAttributes()->getLoc(), 5480 diag::warn_attribute_sentinel_not_variadic) << 1; 5481 // FIXME: remove the attribute. 5482 } 5483 5484 // Analyze the return type. 5485 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5486 QualType RetTy = T->getAsFunctionType()->getResultType(); 5487 5488 // Do not allow returning a objc interface by-value. 5489 if (RetTy->isObjCInterfaceType()) { 5490 Diag(ParamInfo.getSourceRange().getBegin(), 5491 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5492 } else if (!RetTy->isDependentType()) 5493 CurBlock->ReturnType = RetTy; 5494} 5495 5496/// ActOnBlockError - If there is an error parsing a block, this callback 5497/// is invoked to pop the information about the block from the action impl. 5498void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5499 // Ensure that CurBlock is deleted. 5500 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5501 5502 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5503 5504 // Pop off CurBlock, handle nested blocks. 5505 PopDeclContext(); 5506 CurBlock = CurBlock->PrevBlockInfo; 5507 // FIXME: Delete the ParmVarDecl objects as well??? 5508} 5509 5510/// ActOnBlockStmtExpr - This is called when the body of a block statement 5511/// literal was successfully completed. ^(int x){...} 5512Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5513 StmtArg body, Scope *CurScope) { 5514 // If blocks are disabled, emit an error. 5515 if (!LangOpts.Blocks) 5516 Diag(CaretLoc, diag::err_blocks_disable); 5517 5518 // Ensure that CurBlock is deleted. 5519 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5520 5521 PopDeclContext(); 5522 5523 // Pop off CurBlock, handle nested blocks. 5524 CurBlock = CurBlock->PrevBlockInfo; 5525 5526 QualType RetTy = Context.VoidTy; 5527 if (!BSI->ReturnType.isNull()) 5528 RetTy = BSI->ReturnType; 5529 5530 llvm::SmallVector<QualType, 8> ArgTypes; 5531 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5532 ArgTypes.push_back(BSI->Params[i]->getType()); 5533 5534 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 5535 QualType BlockTy; 5536 if (!BSI->hasPrototype) 5537 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 5538 NoReturn); 5539 else 5540 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 5541 BSI->isVariadic, 0, false, false, 0, 0, 5542 NoReturn); 5543 5544 // FIXME: Check that return/parameter types are complete/non-abstract 5545 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 5546 BlockTy = Context.getBlockPointerType(BlockTy); 5547 5548 // If needed, diagnose invalid gotos and switches in the block. 5549 if (CurFunctionNeedsScopeChecking) 5550 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 5551 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 5552 5553 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 5554 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 5555 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 5556 BSI->hasBlockDeclRefExprs)); 5557} 5558 5559Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 5560 ExprArg expr, TypeTy *type, 5561 SourceLocation RPLoc) { 5562 QualType T = QualType::getFromOpaquePtr(type); 5563 Expr *E = static_cast<Expr*>(expr.get()); 5564 Expr *OrigExpr = E; 5565 5566 InitBuiltinVaListType(); 5567 5568 // Get the va_list type 5569 QualType VaListType = Context.getBuiltinVaListType(); 5570 if (VaListType->isArrayType()) { 5571 // Deal with implicit array decay; for example, on x86-64, 5572 // va_list is an array, but it's supposed to decay to 5573 // a pointer for va_arg. 5574 VaListType = Context.getArrayDecayedType(VaListType); 5575 // Make sure the input expression also decays appropriately. 5576 UsualUnaryConversions(E); 5577 } else { 5578 // Otherwise, the va_list argument must be an l-value because 5579 // it is modified by va_arg. 5580 if (!E->isTypeDependent() && 5581 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 5582 return ExprError(); 5583 } 5584 5585 if (!E->isTypeDependent() && 5586 !Context.hasSameType(VaListType, E->getType())) { 5587 return ExprError(Diag(E->getLocStart(), 5588 diag::err_first_argument_to_va_arg_not_of_type_va_list) 5589 << OrigExpr->getType() << E->getSourceRange()); 5590 } 5591 5592 // FIXME: Check that type is complete/non-abstract 5593 // FIXME: Warn if a non-POD type is passed in. 5594 5595 expr.release(); 5596 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 5597 RPLoc)); 5598} 5599 5600Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 5601 // The type of __null will be int or long, depending on the size of 5602 // pointers on the target. 5603 QualType Ty; 5604 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 5605 Ty = Context.IntTy; 5606 else 5607 Ty = Context.LongTy; 5608 5609 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 5610} 5611 5612bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 5613 SourceLocation Loc, 5614 QualType DstType, QualType SrcType, 5615 Expr *SrcExpr, const char *Flavor) { 5616 // Decode the result (notice that AST's are still created for extensions). 5617 bool isInvalid = false; 5618 unsigned DiagKind; 5619 switch (ConvTy) { 5620 default: assert(0 && "Unknown conversion type"); 5621 case Compatible: return false; 5622 case PointerToInt: 5623 DiagKind = diag::ext_typecheck_convert_pointer_int; 5624 break; 5625 case IntToPointer: 5626 DiagKind = diag::ext_typecheck_convert_int_pointer; 5627 break; 5628 case IncompatiblePointer: 5629 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 5630 break; 5631 case IncompatiblePointerSign: 5632 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 5633 break; 5634 case FunctionVoidPointer: 5635 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 5636 break; 5637 case CompatiblePointerDiscardsQualifiers: 5638 // If the qualifiers lost were because we were applying the 5639 // (deprecated) C++ conversion from a string literal to a char* 5640 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 5641 // Ideally, this check would be performed in 5642 // CheckPointerTypesForAssignment. However, that would require a 5643 // bit of refactoring (so that the second argument is an 5644 // expression, rather than a type), which should be done as part 5645 // of a larger effort to fix CheckPointerTypesForAssignment for 5646 // C++ semantics. 5647 if (getLangOptions().CPlusPlus && 5648 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 5649 return false; 5650 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 5651 break; 5652 case IntToBlockPointer: 5653 DiagKind = diag::err_int_to_block_pointer; 5654 break; 5655 case IncompatibleBlockPointer: 5656 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 5657 break; 5658 case IncompatibleObjCQualifiedId: 5659 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 5660 // it can give a more specific diagnostic. 5661 DiagKind = diag::warn_incompatible_qualified_id; 5662 break; 5663 case IncompatibleVectors: 5664 DiagKind = diag::warn_incompatible_vectors; 5665 break; 5666 case Incompatible: 5667 DiagKind = diag::err_typecheck_convert_incompatible; 5668 isInvalid = true; 5669 break; 5670 } 5671 5672 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 5673 << SrcExpr->getSourceRange(); 5674 return isInvalid; 5675} 5676 5677bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 5678 llvm::APSInt ICEResult; 5679 if (E->isIntegerConstantExpr(ICEResult, Context)) { 5680 if (Result) 5681 *Result = ICEResult; 5682 return false; 5683 } 5684 5685 Expr::EvalResult EvalResult; 5686 5687 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 5688 EvalResult.HasSideEffects) { 5689 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 5690 5691 if (EvalResult.Diag) { 5692 // We only show the note if it's not the usual "invalid subexpression" 5693 // or if it's actually in a subexpression. 5694 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 5695 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 5696 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5697 } 5698 5699 return true; 5700 } 5701 5702 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 5703 E->getSourceRange(); 5704 5705 if (EvalResult.Diag && 5706 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 5707 Diag(EvalResult.DiagLoc, EvalResult.Diag); 5708 5709 if (Result) 5710 *Result = EvalResult.Val.getInt(); 5711 return false; 5712} 5713 5714Sema::ExpressionEvaluationContext 5715Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 5716 // Introduce a new set of potentially referenced declarations to the stack. 5717 if (NewContext == PotentiallyPotentiallyEvaluated) 5718 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 5719 5720 std::swap(ExprEvalContext, NewContext); 5721 return NewContext; 5722} 5723 5724void 5725Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 5726 ExpressionEvaluationContext NewContext) { 5727 ExprEvalContext = NewContext; 5728 5729 if (OldContext == PotentiallyPotentiallyEvaluated) { 5730 // Mark any remaining declarations in the current position of the stack 5731 // as "referenced". If they were not meant to be referenced, semantic 5732 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 5733 PotentiallyReferencedDecls RemainingDecls; 5734 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 5735 PotentiallyReferencedDeclStack.pop_back(); 5736 5737 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 5738 IEnd = RemainingDecls.end(); 5739 I != IEnd; ++I) 5740 MarkDeclarationReferenced(I->first, I->second); 5741 } 5742} 5743 5744/// \brief Note that the given declaration was referenced in the source code. 5745/// 5746/// This routine should be invoke whenever a given declaration is referenced 5747/// in the source code, and where that reference occurred. If this declaration 5748/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 5749/// C99 6.9p3), then the declaration will be marked as used. 5750/// 5751/// \param Loc the location where the declaration was referenced. 5752/// 5753/// \param D the declaration that has been referenced by the source code. 5754void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 5755 assert(D && "No declaration?"); 5756 5757 if (D->isUsed()) 5758 return; 5759 5760 // Mark a parameter declaration "used", regardless of whether we're in a 5761 // template or not. 5762 if (isa<ParmVarDecl>(D)) 5763 D->setUsed(true); 5764 5765 // Do not mark anything as "used" within a dependent context; wait for 5766 // an instantiation. 5767 if (CurContext->isDependentContext()) 5768 return; 5769 5770 switch (ExprEvalContext) { 5771 case Unevaluated: 5772 // We are in an expression that is not potentially evaluated; do nothing. 5773 return; 5774 5775 case PotentiallyEvaluated: 5776 // We are in a potentially-evaluated expression, so this declaration is 5777 // "used"; handle this below. 5778 break; 5779 5780 case PotentiallyPotentiallyEvaluated: 5781 // We are in an expression that may be potentially evaluated; queue this 5782 // declaration reference until we know whether the expression is 5783 // potentially evaluated. 5784 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 5785 return; 5786 } 5787 5788 // Note that this declaration has been used. 5789 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 5790 unsigned TypeQuals; 5791 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 5792 if (!Constructor->isUsed()) 5793 DefineImplicitDefaultConstructor(Loc, Constructor); 5794 } 5795 else if (Constructor->isImplicit() && 5796 Constructor->isCopyConstructor(Context, TypeQuals)) { 5797 if (!Constructor->isUsed()) 5798 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 5799 } 5800 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 5801 if (Destructor->isImplicit() && !Destructor->isUsed()) 5802 DefineImplicitDestructor(Loc, Destructor); 5803 5804 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 5805 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 5806 MethodDecl->getOverloadedOperator() == OO_Equal) { 5807 if (!MethodDecl->isUsed()) 5808 DefineImplicitOverloadedAssign(Loc, MethodDecl); 5809 } 5810 } 5811 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 5812 // Implicit instantiation of function templates and member functions of 5813 // class templates. 5814 if (!Function->getBody()) { 5815 // FIXME: distinguish between implicit instantiations of function 5816 // templates and explicit specializations (the latter don't get 5817 // instantiated, naturally). 5818 if (Function->getInstantiatedFromMemberFunction() || 5819 Function->getPrimaryTemplate()) 5820 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 5821 } 5822 5823 5824 // FIXME: keep track of references to static functions 5825 Function->setUsed(true); 5826 return; 5827 } 5828 5829 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 5830 // Implicit instantiation of static data members of class templates. 5831 // FIXME: distinguish between implicit instantiations (which we need to 5832 // actually instantiate) and explicit specializations. 5833 if (Var->isStaticDataMember() && 5834 Var->getInstantiatedFromStaticDataMember()) 5835 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 5836 5837 // FIXME: keep track of references to static data? 5838 5839 D->setUsed(true); 5840 return; 5841} 5842} 5843 5844