SemaExpr.cpp revision 0ba3aff6166d24f3e6732c033e87bf3d33faad7b
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/DeclTemplate.h" 18#include "clang/AST/ExprCXX.h" 19#include "clang/AST/ExprObjC.h" 20#include "clang/Basic/PartialDiagnostic.h" 21#include "clang/Basic/SourceManager.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Lex/LiteralSupport.h" 24#include "clang/Lex/Preprocessor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Designator.h" 27#include "clang/Parse/Scope.h" 28using namespace clang; 29 30 31/// \brief Determine whether the use of this declaration is valid, and 32/// emit any corresponding diagnostics. 33/// 34/// This routine diagnoses various problems with referencing 35/// declarations that can occur when using a declaration. For example, 36/// it might warn if a deprecated or unavailable declaration is being 37/// used, or produce an error (and return true) if a C++0x deleted 38/// function is being used. 39/// 40/// If IgnoreDeprecated is set to true, this should not want about deprecated 41/// decls. 42/// 43/// \returns true if there was an error (this declaration cannot be 44/// referenced), false otherwise. 45/// 46bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 47 // See if the decl is deprecated. 48 if (D->getAttr<DeprecatedAttr>()) { 49 EmitDeprecationWarning(D, Loc); 50 } 51 52 // See if the decl is unavailable 53 if (D->getAttr<UnavailableAttr>()) { 54 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 55 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 56 } 57 58 // See if this is a deleted function. 59 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 60 if (FD->isDeleted()) { 61 Diag(Loc, diag::err_deleted_function_use); 62 Diag(D->getLocation(), diag::note_unavailable_here) << true; 63 return true; 64 } 65 } 66 67 return false; 68} 69 70/// DiagnoseSentinelCalls - This routine checks on method dispatch calls 71/// (and other functions in future), which have been declared with sentinel 72/// attribute. It warns if call does not have the sentinel argument. 73/// 74void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc, 75 Expr **Args, unsigned NumArgs) { 76 const SentinelAttr *attr = D->getAttr<SentinelAttr>(); 77 if (!attr) 78 return; 79 int sentinelPos = attr->getSentinel(); 80 int nullPos = attr->getNullPos(); 81 82 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common 83 // base class. Then we won't be needing two versions of the same code. 84 unsigned int i = 0; 85 bool warnNotEnoughArgs = false; 86 int isMethod = 0; 87 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 88 // skip over named parameters. 89 ObjCMethodDecl::param_iterator P, E = MD->param_end(); 90 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) { 91 if (nullPos) 92 --nullPos; 93 else 94 ++i; 95 } 96 warnNotEnoughArgs = (P != E || i >= NumArgs); 97 isMethod = 1; 98 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 99 // skip over named parameters. 100 ObjCMethodDecl::param_iterator P, E = FD->param_end(); 101 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) { 102 if (nullPos) 103 --nullPos; 104 else 105 ++i; 106 } 107 warnNotEnoughArgs = (P != E || i >= NumArgs); 108 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) { 109 // block or function pointer call. 110 QualType Ty = V->getType(); 111 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) { 112 const FunctionType *FT = Ty->isFunctionPointerType() 113 ? Ty->getAs<PointerType>()->getPointeeType()->getAs<FunctionType>() 114 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>(); 115 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) { 116 unsigned NumArgsInProto = Proto->getNumArgs(); 117 unsigned k; 118 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) { 119 if (nullPos) 120 --nullPos; 121 else 122 ++i; 123 } 124 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs); 125 } 126 if (Ty->isBlockPointerType()) 127 isMethod = 2; 128 } else 129 return; 130 } else 131 return; 132 133 if (warnNotEnoughArgs) { 134 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 135 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 136 return; 137 } 138 int sentinel = i; 139 while (sentinelPos > 0 && i < NumArgs-1) { 140 --sentinelPos; 141 ++i; 142 } 143 if (sentinelPos > 0) { 144 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName(); 145 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 146 return; 147 } 148 while (i < NumArgs-1) { 149 ++i; 150 ++sentinel; 151 } 152 Expr *sentinelExpr = Args[sentinel]; 153 if (sentinelExpr && (!sentinelExpr->getType()->isPointerType() || 154 !sentinelExpr->isNullPointerConstant(Context, 155 Expr::NPC_ValueDependentIsNull))) { 156 Diag(Loc, diag::warn_missing_sentinel) << isMethod; 157 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod; 158 } 159 return; 160} 161 162SourceRange Sema::getExprRange(ExprTy *E) const { 163 Expr *Ex = (Expr *)E; 164 return Ex? Ex->getSourceRange() : SourceRange(); 165} 166 167//===----------------------------------------------------------------------===// 168// Standard Promotions and Conversions 169//===----------------------------------------------------------------------===// 170 171/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 172void Sema::DefaultFunctionArrayConversion(Expr *&E) { 173 QualType Ty = E->getType(); 174 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 175 176 if (Ty->isFunctionType()) 177 ImpCastExprToType(E, Context.getPointerType(Ty), 178 CastExpr::CK_FunctionToPointerDecay); 179 else if (Ty->isArrayType()) { 180 // In C90 mode, arrays only promote to pointers if the array expression is 181 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 182 // type 'array of type' is converted to an expression that has type 'pointer 183 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 184 // that has type 'array of type' ...". The relevant change is "an lvalue" 185 // (C90) to "an expression" (C99). 186 // 187 // C++ 4.2p1: 188 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 189 // T" can be converted to an rvalue of type "pointer to T". 190 // 191 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 192 E->isLvalue(Context) == Expr::LV_Valid) 193 ImpCastExprToType(E, Context.getArrayDecayedType(Ty), 194 CastExpr::CK_ArrayToPointerDecay); 195 } 196} 197 198/// UsualUnaryConversions - Performs various conversions that are common to most 199/// operators (C99 6.3). The conversions of array and function types are 200/// sometimes surpressed. For example, the array->pointer conversion doesn't 201/// apply if the array is an argument to the sizeof or address (&) operators. 202/// In these instances, this routine should *not* be called. 203Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 204 QualType Ty = Expr->getType(); 205 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 206 207 // C99 6.3.1.1p2: 208 // 209 // The following may be used in an expression wherever an int or 210 // unsigned int may be used: 211 // - an object or expression with an integer type whose integer 212 // conversion rank is less than or equal to the rank of int 213 // and unsigned int. 214 // - A bit-field of type _Bool, int, signed int, or unsigned int. 215 // 216 // If an int can represent all values of the original type, the 217 // value is converted to an int; otherwise, it is converted to an 218 // unsigned int. These are called the integer promotions. All 219 // other types are unchanged by the integer promotions. 220 QualType PTy = Context.isPromotableBitField(Expr); 221 if (!PTy.isNull()) { 222 ImpCastExprToType(Expr, PTy, CastExpr::CK_IntegralCast); 223 return Expr; 224 } 225 if (Ty->isPromotableIntegerType()) { 226 QualType PT = Context.getPromotedIntegerType(Ty); 227 ImpCastExprToType(Expr, PT, CastExpr::CK_IntegralCast); 228 return Expr; 229 } 230 231 DefaultFunctionArrayConversion(Expr); 232 return Expr; 233} 234 235/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 236/// do not have a prototype. Arguments that have type float are promoted to 237/// double. All other argument types are converted by UsualUnaryConversions(). 238void Sema::DefaultArgumentPromotion(Expr *&Expr) { 239 QualType Ty = Expr->getType(); 240 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 241 242 // If this is a 'float' (CVR qualified or typedef) promote to double. 243 if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) 244 if (BT->getKind() == BuiltinType::Float) 245 return ImpCastExprToType(Expr, Context.DoubleTy, 246 CastExpr::CK_FloatingCast); 247 248 UsualUnaryConversions(Expr); 249} 250 251/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 252/// will warn if the resulting type is not a POD type, and rejects ObjC 253/// interfaces passed by value. This returns true if the argument type is 254/// completely illegal. 255bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 256 DefaultArgumentPromotion(Expr); 257 258 if (Expr->getType()->isObjCInterfaceType()) { 259 Diag(Expr->getLocStart(), 260 diag::err_cannot_pass_objc_interface_to_vararg) 261 << Expr->getType() << CT; 262 return true; 263 } 264 265 if (!Expr->getType()->isPODType()) 266 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 267 << Expr->getType() << CT; 268 269 return false; 270} 271 272 273/// UsualArithmeticConversions - Performs various conversions that are common to 274/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 275/// routine returns the first non-arithmetic type found. The client is 276/// responsible for emitting appropriate error diagnostics. 277/// FIXME: verify the conversion rules for "complex int" are consistent with 278/// GCC. 279QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 280 bool isCompAssign) { 281 if (!isCompAssign) 282 UsualUnaryConversions(lhsExpr); 283 284 UsualUnaryConversions(rhsExpr); 285 286 // For conversion purposes, we ignore any qualifiers. 287 // For example, "const float" and "float" are equivalent. 288 QualType lhs = 289 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 290 QualType rhs = 291 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 292 293 // If both types are identical, no conversion is needed. 294 if (lhs == rhs) 295 return lhs; 296 297 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 298 // The caller can deal with this (e.g. pointer + int). 299 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 300 return lhs; 301 302 // Perform bitfield promotions. 303 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr); 304 if (!LHSBitfieldPromoteTy.isNull()) 305 lhs = LHSBitfieldPromoteTy; 306 QualType RHSBitfieldPromoteTy = Context.isPromotableBitField(rhsExpr); 307 if (!RHSBitfieldPromoteTy.isNull()) 308 rhs = RHSBitfieldPromoteTy; 309 310 QualType destType = Context.UsualArithmeticConversionsType(lhs, rhs); 311 if (!isCompAssign) 312 ImpCastExprToType(lhsExpr, destType, CastExpr::CK_Unknown); 313 ImpCastExprToType(rhsExpr, destType, CastExpr::CK_Unknown); 314 return destType; 315} 316 317//===----------------------------------------------------------------------===// 318// Semantic Analysis for various Expression Types 319//===----------------------------------------------------------------------===// 320 321 322/// ActOnStringLiteral - The specified tokens were lexed as pasted string 323/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 324/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 325/// multiple tokens. However, the common case is that StringToks points to one 326/// string. 327/// 328Action::OwningExprResult 329Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 330 assert(NumStringToks && "Must have at least one string!"); 331 332 StringLiteralParser Literal(StringToks, NumStringToks, PP); 333 if (Literal.hadError) 334 return ExprError(); 335 336 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 337 for (unsigned i = 0; i != NumStringToks; ++i) 338 StringTokLocs.push_back(StringToks[i].getLocation()); 339 340 QualType StrTy = Context.CharTy; 341 if (Literal.AnyWide) StrTy = Context.getWCharType(); 342 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 343 344 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 345 if (getLangOptions().CPlusPlus) 346 StrTy.addConst(); 347 348 // Get an array type for the string, according to C99 6.4.5. This includes 349 // the nul terminator character as well as the string length for pascal 350 // strings. 351 StrTy = Context.getConstantArrayType(StrTy, 352 llvm::APInt(32, Literal.GetNumStringChars()+1), 353 ArrayType::Normal, 0); 354 355 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 356 return Owned(StringLiteral::Create(Context, Literal.GetString(), 357 Literal.GetStringLength(), 358 Literal.AnyWide, StrTy, 359 &StringTokLocs[0], 360 StringTokLocs.size())); 361} 362 363/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 364/// CurBlock to VD should cause it to be snapshotted (as we do for auto 365/// variables defined outside the block) or false if this is not needed (e.g. 366/// for values inside the block or for globals). 367/// 368/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 369/// up-to-date. 370/// 371static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 372 ValueDecl *VD) { 373 // If the value is defined inside the block, we couldn't snapshot it even if 374 // we wanted to. 375 if (CurBlock->TheDecl == VD->getDeclContext()) 376 return false; 377 378 // If this is an enum constant or function, it is constant, don't snapshot. 379 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 380 return false; 381 382 // If this is a reference to an extern, static, or global variable, no need to 383 // snapshot it. 384 // FIXME: What about 'const' variables in C++? 385 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 386 if (!Var->hasLocalStorage()) 387 return false; 388 389 // Blocks that have these can't be constant. 390 CurBlock->hasBlockDeclRefExprs = true; 391 392 // If we have nested blocks, the decl may be declared in an outer block (in 393 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 394 // be defined outside all of the current blocks (in which case the blocks do 395 // all get the bit). Walk the nesting chain. 396 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 397 NextBlock = NextBlock->PrevBlockInfo) { 398 // If we found the defining block for the variable, don't mark the block as 399 // having a reference outside it. 400 if (NextBlock->TheDecl == VD->getDeclContext()) 401 break; 402 403 // Otherwise, the DeclRef from the inner block causes the outer one to need 404 // a snapshot as well. 405 NextBlock->hasBlockDeclRefExprs = true; 406 } 407 408 return true; 409} 410 411 412 413/// BuildDeclRefExpr - Build a DeclRefExpr. 414Sema::OwningExprResult 415Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 416 bool TypeDependent, bool ValueDependent, 417 const CXXScopeSpec *SS) { 418 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) { 419 Diag(Loc, 420 diag::err_auto_variable_cannot_appear_in_own_initializer) 421 << D->getDeclName(); 422 return ExprError(); 423 } 424 425 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 426 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 427 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) { 428 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) { 429 Diag(Loc, diag::err_reference_to_local_var_in_enclosing_function) 430 << D->getIdentifier() << FD->getDeclName(); 431 Diag(D->getLocation(), diag::note_local_variable_declared_here) 432 << D->getIdentifier(); 433 return ExprError(); 434 } 435 } 436 } 437 } 438 439 MarkDeclarationReferenced(Loc, D); 440 441 return Owned(DeclRefExpr::Create(Context, 442 SS? (NestedNameSpecifier *)SS->getScopeRep() : 0, 443 SS? SS->getRange() : SourceRange(), 444 D, Loc, 445 Ty, TypeDependent, ValueDependent)); 446} 447 448/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 449/// variable corresponding to the anonymous union or struct whose type 450/// is Record. 451static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 452 RecordDecl *Record) { 453 assert(Record->isAnonymousStructOrUnion() && 454 "Record must be an anonymous struct or union!"); 455 456 // FIXME: Once Decls are directly linked together, this will be an O(1) 457 // operation rather than a slow walk through DeclContext's vector (which 458 // itself will be eliminated). DeclGroups might make this even better. 459 DeclContext *Ctx = Record->getDeclContext(); 460 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 461 DEnd = Ctx->decls_end(); 462 D != DEnd; ++D) { 463 if (*D == Record) { 464 // The object for the anonymous struct/union directly 465 // follows its type in the list of declarations. 466 ++D; 467 assert(D != DEnd && "Missing object for anonymous record"); 468 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 469 return *D; 470 } 471 } 472 473 assert(false && "Missing object for anonymous record"); 474 return 0; 475} 476 477/// \brief Given a field that represents a member of an anonymous 478/// struct/union, build the path from that field's context to the 479/// actual member. 480/// 481/// Construct the sequence of field member references we'll have to 482/// perform to get to the field in the anonymous union/struct. The 483/// list of members is built from the field outward, so traverse it 484/// backwards to go from an object in the current context to the field 485/// we found. 486/// 487/// \returns The variable from which the field access should begin, 488/// for an anonymous struct/union that is not a member of another 489/// class. Otherwise, returns NULL. 490VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 491 llvm::SmallVectorImpl<FieldDecl *> &Path) { 492 assert(Field->getDeclContext()->isRecord() && 493 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 494 && "Field must be stored inside an anonymous struct or union"); 495 496 Path.push_back(Field); 497 VarDecl *BaseObject = 0; 498 DeclContext *Ctx = Field->getDeclContext(); 499 do { 500 RecordDecl *Record = cast<RecordDecl>(Ctx); 501 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 502 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 503 Path.push_back(AnonField); 504 else { 505 BaseObject = cast<VarDecl>(AnonObject); 506 break; 507 } 508 Ctx = Ctx->getParent(); 509 } while (Ctx->isRecord() && 510 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 511 512 return BaseObject; 513} 514 515Sema::OwningExprResult 516Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 517 FieldDecl *Field, 518 Expr *BaseObjectExpr, 519 SourceLocation OpLoc) { 520 llvm::SmallVector<FieldDecl *, 4> AnonFields; 521 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 522 AnonFields); 523 524 // Build the expression that refers to the base object, from 525 // which we will build a sequence of member references to each 526 // of the anonymous union objects and, eventually, the field we 527 // found via name lookup. 528 bool BaseObjectIsPointer = false; 529 Qualifiers BaseQuals; 530 if (BaseObject) { 531 // BaseObject is an anonymous struct/union variable (and is, 532 // therefore, not part of another non-anonymous record). 533 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 534 MarkDeclarationReferenced(Loc, BaseObject); 535 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 536 SourceLocation()); 537 BaseQuals 538 = Context.getCanonicalType(BaseObject->getType()).getQualifiers(); 539 } else if (BaseObjectExpr) { 540 // The caller provided the base object expression. Determine 541 // whether its a pointer and whether it adds any qualifiers to the 542 // anonymous struct/union fields we're looking into. 543 QualType ObjectType = BaseObjectExpr->getType(); 544 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) { 545 BaseObjectIsPointer = true; 546 ObjectType = ObjectPtr->getPointeeType(); 547 } 548 BaseQuals 549 = Context.getCanonicalType(ObjectType).getQualifiers(); 550 } else { 551 // We've found a member of an anonymous struct/union that is 552 // inside a non-anonymous struct/union, so in a well-formed 553 // program our base object expression is "this". 554 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 555 if (!MD->isStatic()) { 556 QualType AnonFieldType 557 = Context.getTagDeclType( 558 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 559 QualType ThisType = Context.getTagDeclType(MD->getParent()); 560 if ((Context.getCanonicalType(AnonFieldType) 561 == Context.getCanonicalType(ThisType)) || 562 IsDerivedFrom(ThisType, AnonFieldType)) { 563 // Our base object expression is "this". 564 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 565 MD->getThisType(Context)); 566 BaseObjectIsPointer = true; 567 } 568 } else { 569 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 570 << Field->getDeclName()); 571 } 572 BaseQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 573 } 574 575 if (!BaseObjectExpr) 576 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 577 << Field->getDeclName()); 578 } 579 580 // Build the implicit member references to the field of the 581 // anonymous struct/union. 582 Expr *Result = BaseObjectExpr; 583 Qualifiers ResultQuals = BaseQuals; 584 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 585 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 586 FI != FIEnd; ++FI) { 587 QualType MemberType = (*FI)->getType(); 588 Qualifiers MemberTypeQuals = 589 Context.getCanonicalType(MemberType).getQualifiers(); 590 591 // CVR attributes from the base are picked up by members, 592 // except that 'mutable' members don't pick up 'const'. 593 if ((*FI)->isMutable()) 594 ResultQuals.removeConst(); 595 596 // GC attributes are never picked up by members. 597 ResultQuals.removeObjCGCAttr(); 598 599 // TR 18037 does not allow fields to be declared with address spaces. 600 assert(!MemberTypeQuals.hasAddressSpace()); 601 602 Qualifiers NewQuals = ResultQuals + MemberTypeQuals; 603 if (NewQuals != MemberTypeQuals) 604 MemberType = Context.getQualifiedType(MemberType, NewQuals); 605 606 MarkDeclarationReferenced(Loc, *FI); 607 // FIXME: Might this end up being a qualified name? 608 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 609 OpLoc, MemberType); 610 BaseObjectIsPointer = false; 611 ResultQuals = NewQuals; 612 } 613 614 return Owned(Result); 615} 616 617Sema::OwningExprResult Sema::ActOnIdExpression(Scope *S, 618 const CXXScopeSpec &SS, 619 UnqualifiedId &Name, 620 bool HasTrailingLParen, 621 bool IsAddressOfOperand) { 622 if (Name.getKind() == UnqualifiedId::IK_TemplateId) { 623 ASTTemplateArgsPtr TemplateArgsPtr(*this, 624 Name.TemplateId->getTemplateArgs(), 625 Name.TemplateId->getTemplateArgIsType(), 626 Name.TemplateId->NumArgs); 627 return ActOnTemplateIdExpr(SS, 628 TemplateTy::make(Name.TemplateId->Template), 629 Name.TemplateId->TemplateNameLoc, 630 Name.TemplateId->LAngleLoc, 631 TemplateArgsPtr, 632 Name.TemplateId->getTemplateArgLocations(), 633 Name.TemplateId->RAngleLoc); 634 } 635 636 // FIXME: We lose a bunch of source information by doing this. Later, 637 // we'll want to merge ActOnDeclarationNameExpr's logic into 638 // ActOnIdExpression. 639 return ActOnDeclarationNameExpr(S, 640 Name.StartLocation, 641 GetNameFromUnqualifiedId(Name), 642 HasTrailingLParen, 643 &SS, 644 IsAddressOfOperand); 645} 646 647/// ActOnDeclarationNameExpr - The parser has read some kind of name 648/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 649/// performs lookup on that name and returns an expression that refers 650/// to that name. This routine isn't directly called from the parser, 651/// because the parser doesn't know about DeclarationName. Rather, 652/// this routine is called by ActOnIdExpression, which contains a 653/// parsed UnqualifiedId. 654/// 655/// HasTrailingLParen indicates whether this identifier is used in a 656/// function call context. LookupCtx is only used for a C++ 657/// qualified-id (foo::bar) to indicate the class or namespace that 658/// the identifier must be a member of. 659/// 660/// isAddressOfOperand means that this expression is the direct operand 661/// of an address-of operator. This matters because this is the only 662/// situation where a qualified name referencing a non-static member may 663/// appear outside a member function of this class. 664Sema::OwningExprResult 665Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 666 DeclarationName Name, bool HasTrailingLParen, 667 const CXXScopeSpec *SS, 668 bool isAddressOfOperand) { 669 // Could be enum-constant, value decl, instance variable, etc. 670 if (SS && SS->isInvalid()) 671 return ExprError(); 672 673 // C++ [temp.dep.expr]p3: 674 // An id-expression is type-dependent if it contains: 675 // -- a nested-name-specifier that contains a class-name that 676 // names a dependent type. 677 // FIXME: Member of the current instantiation. 678 if (SS && isDependentScopeSpecifier(*SS)) { 679 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 680 Loc, SS->getRange(), 681 static_cast<NestedNameSpecifier *>(SS->getScopeRep()), 682 isAddressOfOperand)); 683 } 684 685 LookupResult Lookup; 686 LookupParsedName(Lookup, S, SS, Name, LookupOrdinaryName, false, true, Loc); 687 688 if (Lookup.isAmbiguous()) { 689 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 690 SS && SS->isSet() ? SS->getRange() 691 : SourceRange()); 692 return ExprError(); 693 } 694 695 NamedDecl *D = Lookup.getAsSingleDecl(Context); 696 697 // If this reference is in an Objective-C method, then ivar lookup happens as 698 // well. 699 IdentifierInfo *II = Name.getAsIdentifierInfo(); 700 if (II && getCurMethodDecl()) { 701 // There are two cases to handle here. 1) scoped lookup could have failed, 702 // in which case we should look for an ivar. 2) scoped lookup could have 703 // found a decl, but that decl is outside the current instance method (i.e. 704 // a global variable). In these two cases, we do a lookup for an ivar with 705 // this name, if the lookup sucedes, we replace it our current decl. 706 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 707 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 708 ObjCInterfaceDecl *ClassDeclared; 709 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 710 // Check if referencing a field with __attribute__((deprecated)). 711 if (DiagnoseUseOfDecl(IV, Loc)) 712 return ExprError(); 713 714 // If we're referencing an invalid decl, just return this as a silent 715 // error node. The error diagnostic was already emitted on the decl. 716 if (IV->isInvalidDecl()) 717 return ExprError(); 718 719 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 720 // If a class method attemps to use a free standing ivar, this is 721 // an error. 722 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 723 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 724 << IV->getDeclName()); 725 // If a class method uses a global variable, even if an ivar with 726 // same name exists, use the global. 727 if (!IsClsMethod) { 728 if (IV->getAccessControl() == ObjCIvarDecl::Private && 729 ClassDeclared != IFace) 730 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 731 // FIXME: This should use a new expr for a direct reference, don't 732 // turn this into Self->ivar, just return a BareIVarExpr or something. 733 IdentifierInfo &II = Context.Idents.get("self"); 734 UnqualifiedId SelfName; 735 SelfName.setIdentifier(&II, SourceLocation()); 736 CXXScopeSpec SelfScopeSpec; 737 OwningExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec, 738 SelfName, false, false); 739 MarkDeclarationReferenced(Loc, IV); 740 return Owned(new (Context) 741 ObjCIvarRefExpr(IV, IV->getType(), Loc, 742 SelfExpr.takeAs<Expr>(), true, true)); 743 } 744 } 745 } else if (getCurMethodDecl()->isInstanceMethod()) { 746 // We should warn if a local variable hides an ivar. 747 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 748 ObjCInterfaceDecl *ClassDeclared; 749 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 750 if (IV->getAccessControl() != ObjCIvarDecl::Private || 751 IFace == ClassDeclared) 752 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 753 } 754 } 755 // Needed to implement property "super.method" notation. 756 if (D == 0 && II->isStr("super")) { 757 QualType T; 758 759 if (getCurMethodDecl()->isInstanceMethod()) 760 T = Context.getObjCObjectPointerType(Context.getObjCInterfaceType( 761 getCurMethodDecl()->getClassInterface())); 762 else 763 T = Context.getObjCClassType(); 764 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 765 } 766 } 767 768 // Determine whether this name might be a candidate for 769 // argument-dependent lookup. 770 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 771 HasTrailingLParen; 772 773 if (ADL && D == 0) { 774 // We've seen something of the form 775 // 776 // identifier( 777 // 778 // and we did not find any entity by the name 779 // "identifier". However, this identifier is still subject to 780 // argument-dependent lookup, so keep track of the name. 781 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 782 Context.OverloadTy, 783 Loc)); 784 } 785 786 if (D == 0) { 787 // Otherwise, this could be an implicitly declared function reference (legal 788 // in C90, extension in C99). 789 if (HasTrailingLParen && II && 790 !getLangOptions().CPlusPlus) // Not in C++. 791 D = ImplicitlyDefineFunction(Loc, *II, S); 792 else { 793 // If this name wasn't predeclared and if this is not a function call, 794 // diagnose the problem. 795 if (SS && !SS->isEmpty()) 796 return ExprError(Diag(Loc, diag::err_no_member) 797 << Name << computeDeclContext(*SS, false) 798 << SS->getRange()); 799 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 800 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 801 return ExprError(Diag(Loc, diag::err_undeclared_use) 802 << Name.getAsString()); 803 else 804 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 805 } 806 } 807 808 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 809 // Warn about constructs like: 810 // if (void *X = foo()) { ... } else { X }. 811 // In the else block, the pointer is always false. 812 813 // FIXME: In a template instantiation, we don't have scope 814 // information to check this property. 815 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 816 Scope *CheckS = S; 817 while (CheckS) { 818 if (CheckS->isWithinElse() && 819 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 820 if (Var->getType()->isBooleanType()) 821 ExprError(Diag(Loc, diag::warn_value_always_false) 822 << Var->getDeclName()); 823 else 824 ExprError(Diag(Loc, diag::warn_value_always_zero) 825 << Var->getDeclName()); 826 break; 827 } 828 829 // Move up one more control parent to check again. 830 CheckS = CheckS->getControlParent(); 831 if (CheckS) 832 CheckS = CheckS->getParent(); 833 } 834 } 835 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) { 836 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 837 // C99 DR 316 says that, if a function type comes from a 838 // function definition (without a prototype), that type is only 839 // used for checking compatibility. Therefore, when referencing 840 // the function, we pretend that we don't have the full function 841 // type. 842 if (DiagnoseUseOfDecl(Func, Loc)) 843 return ExprError(); 844 845 QualType T = Func->getType(); 846 QualType NoProtoType = T; 847 if (const FunctionProtoType *Proto = T->getAs<FunctionProtoType>()) 848 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 849 return BuildDeclRefExpr(Func, NoProtoType, Loc, false, false, SS); 850 } 851 } 852 853 return BuildDeclarationNameExpr(Loc, D, HasTrailingLParen, SS, isAddressOfOperand); 854} 855/// \brief Cast member's object to its own class if necessary. 856bool 857Sema::PerformObjectMemberConversion(Expr *&From, NamedDecl *Member) { 858 if (FieldDecl *FD = dyn_cast<FieldDecl>(Member)) 859 if (CXXRecordDecl *RD = 860 dyn_cast<CXXRecordDecl>(FD->getDeclContext())) { 861 QualType DestType = 862 Context.getCanonicalType(Context.getTypeDeclType(RD)); 863 if (DestType->isDependentType() || From->getType()->isDependentType()) 864 return false; 865 QualType FromRecordType = From->getType(); 866 QualType DestRecordType = DestType; 867 if (FromRecordType->getAs<PointerType>()) { 868 DestType = Context.getPointerType(DestType); 869 FromRecordType = FromRecordType->getPointeeType(); 870 } 871 if (!Context.hasSameUnqualifiedType(FromRecordType, DestRecordType) && 872 CheckDerivedToBaseConversion(FromRecordType, 873 DestRecordType, 874 From->getSourceRange().getBegin(), 875 From->getSourceRange())) 876 return true; 877 ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 878 /*isLvalue=*/true); 879 } 880 return false; 881} 882 883/// \brief Build a MemberExpr AST node. 884static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow, 885 const CXXScopeSpec *SS, NamedDecl *Member, 886 SourceLocation Loc, QualType Ty) { 887 if (SS && SS->isSet()) 888 return MemberExpr::Create(C, Base, isArrow, 889 (NestedNameSpecifier *)SS->getScopeRep(), 890 SS->getRange(), Member, Loc, 891 // FIXME: Explicit template argument lists 892 false, SourceLocation(), 0, 0, SourceLocation(), 893 Ty); 894 895 return new (C) MemberExpr(Base, isArrow, Member, Loc, Ty); 896} 897 898/// \brief Complete semantic analysis for a reference to the given declaration. 899Sema::OwningExprResult 900Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D, 901 bool HasTrailingLParen, 902 const CXXScopeSpec *SS, 903 bool isAddressOfOperand) { 904 assert(D && "Cannot refer to a NULL declaration"); 905 DeclarationName Name = D->getDeclName(); 906 907 // If this is an expression of the form &Class::member, don't build an 908 // implicit member ref, because we want a pointer to the member in general, 909 // not any specific instance's member. 910 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 911 DeclContext *DC = computeDeclContext(*SS); 912 if (D && isa<CXXRecordDecl>(DC)) { 913 QualType DType; 914 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 915 DType = FD->getType().getNonReferenceType(); 916 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 917 DType = Method->getType(); 918 } else if (isa<OverloadedFunctionDecl>(D)) { 919 DType = Context.OverloadTy; 920 } 921 // Could be an inner type. That's diagnosed below, so ignore it here. 922 if (!DType.isNull()) { 923 // The pointer is type- and value-dependent if it points into something 924 // dependent. 925 bool Dependent = DC->isDependentContext(); 926 return BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS); 927 } 928 } 929 } 930 931 // We may have found a field within an anonymous union or struct 932 // (C++ [class.union]). 933 // FIXME: This needs to happen post-isImplicitMemberReference? 934 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 935 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 936 return BuildAnonymousStructUnionMemberReference(Loc, FD); 937 938 // Cope with an implicit member access in a C++ non-static member function. 939 QualType ThisType, MemberType; 940 if (isImplicitMemberReference(SS, D, Loc, ThisType, MemberType)) { 941 Expr *This = new (Context) CXXThisExpr(SourceLocation(), ThisType); 942 MarkDeclarationReferenced(Loc, D); 943 if (PerformObjectMemberConversion(This, D)) 944 return ExprError(); 945 946 bool ShouldCheckUse = true; 947 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 948 // Don't diagnose the use of a virtual member function unless it's 949 // explicitly qualified. 950 if (MD->isVirtual() && (!SS || !SS->isSet())) 951 ShouldCheckUse = false; 952 } 953 954 if (ShouldCheckUse && DiagnoseUseOfDecl(D, Loc)) 955 return ExprError(); 956 return Owned(BuildMemberExpr(Context, This, true, SS, D, 957 Loc, MemberType)); 958 } 959 960 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 961 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 962 if (MD->isStatic()) 963 // "invalid use of member 'x' in static member function" 964 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 965 << FD->getDeclName()); 966 } 967 968 // Any other ways we could have found the field in a well-formed 969 // program would have been turned into implicit member expressions 970 // above. 971 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 972 << FD->getDeclName()); 973 } 974 975 if (isa<TypedefDecl>(D)) 976 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 977 if (isa<ObjCInterfaceDecl>(D)) 978 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 979 if (isa<NamespaceDecl>(D)) 980 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 981 982 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 983 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 984 return BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 985 false, false, SS); 986 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 987 return BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 988 false, false, SS); 989 else if (UnresolvedUsingDecl *UD = dyn_cast<UnresolvedUsingDecl>(D)) 990 return BuildDeclRefExpr(UD, Context.DependentTy, Loc, 991 /*TypeDependent=*/true, 992 /*ValueDependent=*/true, SS); 993 994 ValueDecl *VD = cast<ValueDecl>(D); 995 996 // Check whether this declaration can be used. Note that we suppress 997 // this check when we're going to perform argument-dependent lookup 998 // on this function name, because this might not be the function 999 // that overload resolution actually selects. 1000 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 1001 HasTrailingLParen; 1002 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 1003 return ExprError(); 1004 1005 // Only create DeclRefExpr's for valid Decl's. 1006 if (VD->isInvalidDecl()) 1007 return ExprError(); 1008 1009 // If the identifier reference is inside a block, and it refers to a value 1010 // that is outside the block, create a BlockDeclRefExpr instead of a 1011 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 1012 // the block is formed. 1013 // 1014 // We do not do this for things like enum constants, global variables, etc, 1015 // as they do not get snapshotted. 1016 // 1017 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 1018 MarkDeclarationReferenced(Loc, VD); 1019 QualType ExprTy = VD->getType().getNonReferenceType(); 1020 // The BlocksAttr indicates the variable is bound by-reference. 1021 if (VD->getAttr<BlocksAttr>()) 1022 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 1023 // This is to record that a 'const' was actually synthesize and added. 1024 bool constAdded = !ExprTy.isConstQualified(); 1025 // Variable will be bound by-copy, make it const within the closure. 1026 1027 ExprTy.addConst(); 1028 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false, 1029 constAdded)); 1030 } 1031 // If this reference is not in a block or if the referenced variable is 1032 // within the block, create a normal DeclRefExpr. 1033 1034 bool TypeDependent = false; 1035 bool ValueDependent = false; 1036 if (getLangOptions().CPlusPlus) { 1037 // C++ [temp.dep.expr]p3: 1038 // An id-expression is type-dependent if it contains: 1039 // - an identifier that was declared with a dependent type, 1040 if (VD->getType()->isDependentType()) 1041 TypeDependent = true; 1042 // - FIXME: a template-id that is dependent, 1043 // - a conversion-function-id that specifies a dependent type, 1044 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1045 Name.getCXXNameType()->isDependentType()) 1046 TypeDependent = true; 1047 // - a nested-name-specifier that contains a class-name that 1048 // names a dependent type. 1049 else if (SS && !SS->isEmpty()) { 1050 for (DeclContext *DC = computeDeclContext(*SS); 1051 DC; DC = DC->getParent()) { 1052 // FIXME: could stop early at namespace scope. 1053 if (DC->isRecord()) { 1054 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1055 if (Context.getTypeDeclType(Record)->isDependentType()) { 1056 TypeDependent = true; 1057 break; 1058 } 1059 } 1060 } 1061 } 1062 1063 // C++ [temp.dep.constexpr]p2: 1064 // 1065 // An identifier is value-dependent if it is: 1066 // - a name declared with a dependent type, 1067 if (TypeDependent) 1068 ValueDependent = true; 1069 // - the name of a non-type template parameter, 1070 else if (isa<NonTypeTemplateParmDecl>(VD)) 1071 ValueDependent = true; 1072 // - a constant with integral or enumeration type and is 1073 // initialized with an expression that is value-dependent 1074 else if (const VarDecl *Dcl = dyn_cast<VarDecl>(VD)) { 1075 if (Context.getCanonicalType(Dcl->getType()).getCVRQualifiers() 1076 == Qualifiers::Const && 1077 Dcl->getInit()) { 1078 ValueDependent = Dcl->getInit()->isValueDependent(); 1079 } 1080 } 1081 } 1082 1083 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1084 TypeDependent, ValueDependent, SS); 1085} 1086 1087Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1088 tok::TokenKind Kind) { 1089 PredefinedExpr::IdentType IT; 1090 1091 switch (Kind) { 1092 default: assert(0 && "Unknown simple primary expr!"); 1093 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1094 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1095 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1096 } 1097 1098 // Pre-defined identifiers are of type char[x], where x is the length of the 1099 // string. 1100 1101 Decl *currentDecl = getCurFunctionOrMethodDecl(); 1102 if (!currentDecl) { 1103 Diag(Loc, diag::ext_predef_outside_function); 1104 currentDecl = Context.getTranslationUnitDecl(); 1105 } 1106 1107 QualType ResTy; 1108 if (cast<DeclContext>(currentDecl)->isDependentContext()) { 1109 ResTy = Context.DependentTy; 1110 } else { 1111 unsigned Length = 1112 PredefinedExpr::ComputeName(Context, IT, currentDecl).length(); 1113 1114 llvm::APInt LengthI(32, Length + 1); 1115 ResTy = Context.CharTy.withConst(); 1116 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1117 } 1118 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1119} 1120 1121Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1122 llvm::SmallString<16> CharBuffer; 1123 CharBuffer.resize(Tok.getLength()); 1124 const char *ThisTokBegin = &CharBuffer[0]; 1125 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1126 1127 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1128 Tok.getLocation(), PP); 1129 if (Literal.hadError()) 1130 return ExprError(); 1131 1132 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1133 1134 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1135 Literal.isWide(), 1136 type, Tok.getLocation())); 1137} 1138 1139Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1140 // Fast path for a single digit (which is quite common). A single digit 1141 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1142 if (Tok.getLength() == 1) { 1143 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1144 unsigned IntSize = Context.Target.getIntWidth(); 1145 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1146 Context.IntTy, Tok.getLocation())); 1147 } 1148 1149 llvm::SmallString<512> IntegerBuffer; 1150 // Add padding so that NumericLiteralParser can overread by one character. 1151 IntegerBuffer.resize(Tok.getLength()+1); 1152 const char *ThisTokBegin = &IntegerBuffer[0]; 1153 1154 // Get the spelling of the token, which eliminates trigraphs, etc. 1155 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1156 1157 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1158 Tok.getLocation(), PP); 1159 if (Literal.hadError) 1160 return ExprError(); 1161 1162 Expr *Res; 1163 1164 if (Literal.isFloatingLiteral()) { 1165 QualType Ty; 1166 if (Literal.isFloat) 1167 Ty = Context.FloatTy; 1168 else if (!Literal.isLong) 1169 Ty = Context.DoubleTy; 1170 else 1171 Ty = Context.LongDoubleTy; 1172 1173 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1174 1175 // isExact will be set by GetFloatValue(). 1176 bool isExact = false; 1177 llvm::APFloat Val = Literal.GetFloatValue(Format, &isExact); 1178 Res = new (Context) FloatingLiteral(Val, isExact, Ty, Tok.getLocation()); 1179 1180 } else if (!Literal.isIntegerLiteral()) { 1181 return ExprError(); 1182 } else { 1183 QualType Ty; 1184 1185 // long long is a C99 feature. 1186 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1187 Literal.isLongLong) 1188 Diag(Tok.getLocation(), diag::ext_longlong); 1189 1190 // Get the value in the widest-possible width. 1191 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1192 1193 if (Literal.GetIntegerValue(ResultVal)) { 1194 // If this value didn't fit into uintmax_t, warn and force to ull. 1195 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1196 Ty = Context.UnsignedLongLongTy; 1197 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1198 "long long is not intmax_t?"); 1199 } else { 1200 // If this value fits into a ULL, try to figure out what else it fits into 1201 // according to the rules of C99 6.4.4.1p5. 1202 1203 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1204 // be an unsigned int. 1205 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1206 1207 // Check from smallest to largest, picking the smallest type we can. 1208 unsigned Width = 0; 1209 if (!Literal.isLong && !Literal.isLongLong) { 1210 // Are int/unsigned possibilities? 1211 unsigned IntSize = Context.Target.getIntWidth(); 1212 1213 // Does it fit in a unsigned int? 1214 if (ResultVal.isIntN(IntSize)) { 1215 // Does it fit in a signed int? 1216 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1217 Ty = Context.IntTy; 1218 else if (AllowUnsigned) 1219 Ty = Context.UnsignedIntTy; 1220 Width = IntSize; 1221 } 1222 } 1223 1224 // Are long/unsigned long possibilities? 1225 if (Ty.isNull() && !Literal.isLongLong) { 1226 unsigned LongSize = Context.Target.getLongWidth(); 1227 1228 // Does it fit in a unsigned long? 1229 if (ResultVal.isIntN(LongSize)) { 1230 // Does it fit in a signed long? 1231 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1232 Ty = Context.LongTy; 1233 else if (AllowUnsigned) 1234 Ty = Context.UnsignedLongTy; 1235 Width = LongSize; 1236 } 1237 } 1238 1239 // Finally, check long long if needed. 1240 if (Ty.isNull()) { 1241 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1242 1243 // Does it fit in a unsigned long long? 1244 if (ResultVal.isIntN(LongLongSize)) { 1245 // Does it fit in a signed long long? 1246 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1247 Ty = Context.LongLongTy; 1248 else if (AllowUnsigned) 1249 Ty = Context.UnsignedLongLongTy; 1250 Width = LongLongSize; 1251 } 1252 } 1253 1254 // If we still couldn't decide a type, we probably have something that 1255 // does not fit in a signed long long, but has no U suffix. 1256 if (Ty.isNull()) { 1257 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1258 Ty = Context.UnsignedLongLongTy; 1259 Width = Context.Target.getLongLongWidth(); 1260 } 1261 1262 if (ResultVal.getBitWidth() != Width) 1263 ResultVal.trunc(Width); 1264 } 1265 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1266 } 1267 1268 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1269 if (Literal.isImaginary) 1270 Res = new (Context) ImaginaryLiteral(Res, 1271 Context.getComplexType(Res->getType())); 1272 1273 return Owned(Res); 1274} 1275 1276Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1277 SourceLocation R, ExprArg Val) { 1278 Expr *E = Val.takeAs<Expr>(); 1279 assert((E != 0) && "ActOnParenExpr() missing expr"); 1280 return Owned(new (Context) ParenExpr(L, R, E)); 1281} 1282 1283/// The UsualUnaryConversions() function is *not* called by this routine. 1284/// See C99 6.3.2.1p[2-4] for more details. 1285bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1286 SourceLocation OpLoc, 1287 const SourceRange &ExprRange, 1288 bool isSizeof) { 1289 if (exprType->isDependentType()) 1290 return false; 1291 1292 // C99 6.5.3.4p1: 1293 if (isa<FunctionType>(exprType)) { 1294 // alignof(function) is allowed as an extension. 1295 if (isSizeof) 1296 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1297 return false; 1298 } 1299 1300 // Allow sizeof(void)/alignof(void) as an extension. 1301 if (exprType->isVoidType()) { 1302 Diag(OpLoc, diag::ext_sizeof_void_type) 1303 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1304 return false; 1305 } 1306 1307 if (RequireCompleteType(OpLoc, exprType, 1308 isSizeof ? diag::err_sizeof_incomplete_type : 1309 PDiag(diag::err_alignof_incomplete_type) 1310 << ExprRange)) 1311 return true; 1312 1313 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1314 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1315 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1316 << exprType << isSizeof << ExprRange; 1317 return true; 1318 } 1319 1320 return false; 1321} 1322 1323bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1324 const SourceRange &ExprRange) { 1325 E = E->IgnoreParens(); 1326 1327 // alignof decl is always ok. 1328 if (isa<DeclRefExpr>(E)) 1329 return false; 1330 1331 // Cannot know anything else if the expression is dependent. 1332 if (E->isTypeDependent()) 1333 return false; 1334 1335 if (E->getBitField()) { 1336 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1337 return true; 1338 } 1339 1340 // Alignment of a field access is always okay, so long as it isn't a 1341 // bit-field. 1342 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) 1343 if (isa<FieldDecl>(ME->getMemberDecl())) 1344 return false; 1345 1346 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1347} 1348 1349/// \brief Build a sizeof or alignof expression given a type operand. 1350Action::OwningExprResult 1351Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1352 bool isSizeOf, SourceRange R) { 1353 if (T.isNull()) 1354 return ExprError(); 1355 1356 if (!T->isDependentType() && 1357 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1358 return ExprError(); 1359 1360 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1361 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1362 Context.getSizeType(), OpLoc, 1363 R.getEnd())); 1364} 1365 1366/// \brief Build a sizeof or alignof expression given an expression 1367/// operand. 1368Action::OwningExprResult 1369Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1370 bool isSizeOf, SourceRange R) { 1371 // Verify that the operand is valid. 1372 bool isInvalid = false; 1373 if (E->isTypeDependent()) { 1374 // Delay type-checking for type-dependent expressions. 1375 } else if (!isSizeOf) { 1376 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1377 } else if (E->getBitField()) { // C99 6.5.3.4p1. 1378 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1379 isInvalid = true; 1380 } else { 1381 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1382 } 1383 1384 if (isInvalid) 1385 return ExprError(); 1386 1387 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1388 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1389 Context.getSizeType(), OpLoc, 1390 R.getEnd())); 1391} 1392 1393/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1394/// the same for @c alignof and @c __alignof 1395/// Note that the ArgRange is invalid if isType is false. 1396Action::OwningExprResult 1397Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1398 void *TyOrEx, const SourceRange &ArgRange) { 1399 // If error parsing type, ignore. 1400 if (TyOrEx == 0) return ExprError(); 1401 1402 if (isType) { 1403 // FIXME: Preserve type source info. 1404 QualType ArgTy = GetTypeFromParser(TyOrEx); 1405 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1406 } 1407 1408 // Get the end location. 1409 Expr *ArgEx = (Expr *)TyOrEx; 1410 Action::OwningExprResult Result 1411 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1412 1413 if (Result.isInvalid()) 1414 DeleteExpr(ArgEx); 1415 1416 return move(Result); 1417} 1418 1419QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1420 if (V->isTypeDependent()) 1421 return Context.DependentTy; 1422 1423 // These operators return the element type of a complex type. 1424 if (const ComplexType *CT = V->getType()->getAs<ComplexType>()) 1425 return CT->getElementType(); 1426 1427 // Otherwise they pass through real integer and floating point types here. 1428 if (V->getType()->isArithmeticType()) 1429 return V->getType(); 1430 1431 // Reject anything else. 1432 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1433 << (isReal ? "__real" : "__imag"); 1434 return QualType(); 1435} 1436 1437 1438 1439Action::OwningExprResult 1440Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1441 tok::TokenKind Kind, ExprArg Input) { 1442 // Since this might be a postfix expression, get rid of ParenListExprs. 1443 Input = MaybeConvertParenListExprToParenExpr(S, move(Input)); 1444 Expr *Arg = (Expr *)Input.get(); 1445 1446 UnaryOperator::Opcode Opc; 1447 switch (Kind) { 1448 default: assert(0 && "Unknown unary op!"); 1449 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1450 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1451 } 1452 1453 if (getLangOptions().CPlusPlus && 1454 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1455 // Which overloaded operator? 1456 OverloadedOperatorKind OverOp = 1457 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1458 1459 // C++ [over.inc]p1: 1460 // 1461 // [...] If the function is a member function with one 1462 // parameter (which shall be of type int) or a non-member 1463 // function with two parameters (the second of which shall be 1464 // of type int), it defines the postfix increment operator ++ 1465 // for objects of that type. When the postfix increment is 1466 // called as a result of using the ++ operator, the int 1467 // argument will have value zero. 1468 Expr *Args[2] = { 1469 Arg, 1470 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1471 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1472 }; 1473 1474 // Build the candidate set for overloading 1475 OverloadCandidateSet CandidateSet; 1476 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1477 1478 // Perform overload resolution. 1479 OverloadCandidateSet::iterator Best; 1480 switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 1481 case OR_Success: { 1482 // We found a built-in operator or an overloaded operator. 1483 FunctionDecl *FnDecl = Best->Function; 1484 1485 if (FnDecl) { 1486 // We matched an overloaded operator. Build a call to that 1487 // operator. 1488 1489 // Convert the arguments. 1490 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1491 if (PerformObjectArgumentInitialization(Arg, Method)) 1492 return ExprError(); 1493 } else { 1494 // Convert the arguments. 1495 if (PerformCopyInitialization(Arg, 1496 FnDecl->getParamDecl(0)->getType(), 1497 "passing")) 1498 return ExprError(); 1499 } 1500 1501 // Determine the result type 1502 QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 1503 1504 // Build the actual expression node. 1505 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1506 SourceLocation()); 1507 UsualUnaryConversions(FnExpr); 1508 1509 Input.release(); 1510 Args[0] = Arg; 1511 1512 ExprOwningPtr<CXXOperatorCallExpr> 1513 TheCall(this, new (Context) CXXOperatorCallExpr(Context, OverOp, 1514 FnExpr, Args, 2, 1515 ResultTy, OpLoc)); 1516 1517 if (CheckCallReturnType(FnDecl->getResultType(), OpLoc, TheCall.get(), 1518 FnDecl)) 1519 return ExprError(); 1520 return Owned(TheCall.release()); 1521 1522 } else { 1523 // We matched a built-in operator. Convert the arguments, then 1524 // break out so that we will build the appropriate built-in 1525 // operator node. 1526 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1527 "passing")) 1528 return ExprError(); 1529 1530 break; 1531 } 1532 } 1533 1534 case OR_No_Viable_Function: { 1535 // No viable function; try checking this as a built-in operator, which 1536 // will fail and provide a diagnostic. Then, print the overload 1537 // candidates. 1538 OwningExprResult Result = CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1539 assert(Result.isInvalid() && 1540 "C++ postfix-unary operator overloading is missing candidates!"); 1541 if (Result.isInvalid()) 1542 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1543 1544 return move(Result); 1545 } 1546 1547 case OR_Ambiguous: 1548 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1549 << UnaryOperator::getOpcodeStr(Opc) 1550 << Arg->getSourceRange(); 1551 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1552 return ExprError(); 1553 1554 case OR_Deleted: 1555 Diag(OpLoc, diag::err_ovl_deleted_oper) 1556 << Best->Function->isDeleted() 1557 << UnaryOperator::getOpcodeStr(Opc) 1558 << Arg->getSourceRange(); 1559 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1560 return ExprError(); 1561 } 1562 1563 // Either we found no viable overloaded operator or we matched a 1564 // built-in operator. In either case, fall through to trying to 1565 // build a built-in operation. 1566 } 1567 1568 Input.release(); 1569 Input = Arg; 1570 return CreateBuiltinUnaryOp(OpLoc, Opc, move(Input)); 1571} 1572 1573Action::OwningExprResult 1574Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1575 ExprArg Idx, SourceLocation RLoc) { 1576 // Since this might be a postfix expression, get rid of ParenListExprs. 1577 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1578 1579 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1580 *RHSExp = static_cast<Expr*>(Idx.get()); 1581 1582 if (getLangOptions().CPlusPlus && 1583 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) { 1584 Base.release(); 1585 Idx.release(); 1586 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1587 Context.DependentTy, RLoc)); 1588 } 1589 1590 if (getLangOptions().CPlusPlus && 1591 (LHSExp->getType()->isRecordType() || 1592 LHSExp->getType()->isEnumeralType() || 1593 RHSExp->getType()->isRecordType() || 1594 RHSExp->getType()->isEnumeralType())) { 1595 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, move(Base),move(Idx)); 1596 } 1597 1598 return CreateBuiltinArraySubscriptExpr(move(Base), LLoc, move(Idx), RLoc); 1599} 1600 1601 1602Action::OwningExprResult 1603Sema::CreateBuiltinArraySubscriptExpr(ExprArg Base, SourceLocation LLoc, 1604 ExprArg Idx, SourceLocation RLoc) { 1605 Expr *LHSExp = static_cast<Expr*>(Base.get()); 1606 Expr *RHSExp = static_cast<Expr*>(Idx.get()); 1607 1608 // Perform default conversions. 1609 DefaultFunctionArrayConversion(LHSExp); 1610 DefaultFunctionArrayConversion(RHSExp); 1611 1612 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1613 1614 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1615 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1616 // in the subscript position. As a result, we need to derive the array base 1617 // and index from the expression types. 1618 Expr *BaseExpr, *IndexExpr; 1619 QualType ResultType; 1620 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1621 BaseExpr = LHSExp; 1622 IndexExpr = RHSExp; 1623 ResultType = Context.DependentTy; 1624 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) { 1625 BaseExpr = LHSExp; 1626 IndexExpr = RHSExp; 1627 ResultType = PTy->getPointeeType(); 1628 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) { 1629 // Handle the uncommon case of "123[Ptr]". 1630 BaseExpr = RHSExp; 1631 IndexExpr = LHSExp; 1632 ResultType = PTy->getPointeeType(); 1633 } else if (const ObjCObjectPointerType *PTy = 1634 LHSTy->getAs<ObjCObjectPointerType>()) { 1635 BaseExpr = LHSExp; 1636 IndexExpr = RHSExp; 1637 ResultType = PTy->getPointeeType(); 1638 } else if (const ObjCObjectPointerType *PTy = 1639 RHSTy->getAs<ObjCObjectPointerType>()) { 1640 // Handle the uncommon case of "123[Ptr]". 1641 BaseExpr = RHSExp; 1642 IndexExpr = LHSExp; 1643 ResultType = PTy->getPointeeType(); 1644 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) { 1645 BaseExpr = LHSExp; // vectors: V[123] 1646 IndexExpr = RHSExp; 1647 1648 // FIXME: need to deal with const... 1649 ResultType = VTy->getElementType(); 1650 } else if (LHSTy->isArrayType()) { 1651 // If we see an array that wasn't promoted by 1652 // DefaultFunctionArrayConversion, it must be an array that 1653 // wasn't promoted because of the C90 rule that doesn't 1654 // allow promoting non-lvalue arrays. Warn, then 1655 // force the promotion here. 1656 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1657 LHSExp->getSourceRange(); 1658 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy), 1659 CastExpr::CK_ArrayToPointerDecay); 1660 LHSTy = LHSExp->getType(); 1661 1662 BaseExpr = LHSExp; 1663 IndexExpr = RHSExp; 1664 ResultType = LHSTy->getAs<PointerType>()->getPointeeType(); 1665 } else if (RHSTy->isArrayType()) { 1666 // Same as previous, except for 123[f().a] case 1667 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) << 1668 RHSExp->getSourceRange(); 1669 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy), 1670 CastExpr::CK_ArrayToPointerDecay); 1671 RHSTy = RHSExp->getType(); 1672 1673 BaseExpr = RHSExp; 1674 IndexExpr = LHSExp; 1675 ResultType = RHSTy->getAs<PointerType>()->getPointeeType(); 1676 } else { 1677 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value) 1678 << LHSExp->getSourceRange() << RHSExp->getSourceRange()); 1679 } 1680 // C99 6.5.2.1p1 1681 if (!(IndexExpr->getType()->isIntegerType() && 1682 IndexExpr->getType()->isScalarType()) && !IndexExpr->isTypeDependent()) 1683 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer) 1684 << IndexExpr->getSourceRange()); 1685 1686 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) || 1687 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U)) 1688 && !IndexExpr->isTypeDependent()) 1689 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange(); 1690 1691 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1692 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1693 // type. Note that Functions are not objects, and that (in C99 parlance) 1694 // incomplete types are not object types. 1695 if (ResultType->isFunctionType()) { 1696 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1697 << ResultType << BaseExpr->getSourceRange(); 1698 return ExprError(); 1699 } 1700 1701 if (!ResultType->isDependentType() && 1702 RequireCompleteType(LLoc, ResultType, 1703 PDiag(diag::err_subscript_incomplete_type) 1704 << BaseExpr->getSourceRange())) 1705 return ExprError(); 1706 1707 // Diagnose bad cases where we step over interface counts. 1708 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1709 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1710 << ResultType << BaseExpr->getSourceRange(); 1711 return ExprError(); 1712 } 1713 1714 Base.release(); 1715 Idx.release(); 1716 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1717 ResultType, RLoc)); 1718} 1719 1720QualType Sema:: 1721CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1722 const IdentifierInfo *CompName, 1723 SourceLocation CompLoc) { 1724 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements, 1725 // see FIXME there. 1726 // 1727 // FIXME: This logic can be greatly simplified by splitting it along 1728 // halving/not halving and reworking the component checking. 1729 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>(); 1730 1731 // The vector accessor can't exceed the number of elements. 1732 const char *compStr = CompName->getNameStart(); 1733 1734 // This flag determines whether or not the component is one of the four 1735 // special names that indicate a subset of exactly half the elements are 1736 // to be selected. 1737 bool HalvingSwizzle = false; 1738 1739 // This flag determines whether or not CompName has an 's' char prefix, 1740 // indicating that it is a string of hex values to be used as vector indices. 1741 bool HexSwizzle = *compStr == 's' || *compStr == 'S'; 1742 1743 // Check that we've found one of the special components, or that the component 1744 // names must come from the same set. 1745 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1746 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1747 HalvingSwizzle = true; 1748 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1749 do 1750 compStr++; 1751 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1752 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1753 do 1754 compStr++; 1755 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1756 } 1757 1758 if (!HalvingSwizzle && *compStr) { 1759 // We didn't get to the end of the string. This means the component names 1760 // didn't come from the same set *or* we encountered an illegal name. 1761 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1762 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1763 return QualType(); 1764 } 1765 1766 // Ensure no component accessor exceeds the width of the vector type it 1767 // operates on. 1768 if (!HalvingSwizzle) { 1769 compStr = CompName->getNameStart(); 1770 1771 if (HexSwizzle) 1772 compStr++; 1773 1774 while (*compStr) { 1775 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1776 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1777 << baseType << SourceRange(CompLoc); 1778 return QualType(); 1779 } 1780 } 1781 } 1782 1783 // If this is a halving swizzle, verify that the base type has an even 1784 // number of elements. 1785 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1786 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1787 << baseType << SourceRange(CompLoc); 1788 return QualType(); 1789 } 1790 1791 // The component accessor looks fine - now we need to compute the actual type. 1792 // The vector type is implied by the component accessor. For example, 1793 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1794 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1795 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1796 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1797 : CompName->getLength(); 1798 if (HexSwizzle) 1799 CompSize--; 1800 1801 if (CompSize == 1) 1802 return vecType->getElementType(); 1803 1804 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1805 // Now look up the TypeDefDecl from the vector type. Without this, 1806 // diagostics look bad. We want extended vector types to appear built-in. 1807 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1808 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1809 return Context.getTypedefType(ExtVectorDecls[i]); 1810 } 1811 return VT; // should never get here (a typedef type should always be found). 1812} 1813 1814static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1815 IdentifierInfo *Member, 1816 const Selector &Sel, 1817 ASTContext &Context) { 1818 1819 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member)) 1820 return PD; 1821 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1822 return OMD; 1823 1824 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1825 E = PDecl->protocol_end(); I != E; ++I) { 1826 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1827 Context)) 1828 return D; 1829 } 1830 return 0; 1831} 1832 1833static Decl *FindGetterNameDecl(const ObjCObjectPointerType *QIdTy, 1834 IdentifierInfo *Member, 1835 const Selector &Sel, 1836 ASTContext &Context) { 1837 // Check protocols on qualified interfaces. 1838 Decl *GDecl = 0; 1839 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1840 E = QIdTy->qual_end(); I != E; ++I) { 1841 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1842 GDecl = PD; 1843 break; 1844 } 1845 // Also must look for a getter name which uses property syntax. 1846 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1847 GDecl = OMD; 1848 break; 1849 } 1850 } 1851 if (!GDecl) { 1852 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 1853 E = QIdTy->qual_end(); I != E; ++I) { 1854 // Search in the protocol-qualifier list of current protocol. 1855 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1856 if (GDecl) 1857 return GDecl; 1858 } 1859 } 1860 return GDecl; 1861} 1862 1863Action::OwningExprResult 1864Sema::BuildMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1865 tok::TokenKind OpKind, SourceLocation MemberLoc, 1866 DeclarationName MemberName, 1867 bool HasExplicitTemplateArgs, 1868 SourceLocation LAngleLoc, 1869 const TemplateArgumentLoc *ExplicitTemplateArgs, 1870 unsigned NumExplicitTemplateArgs, 1871 SourceLocation RAngleLoc, 1872 DeclPtrTy ObjCImpDecl, const CXXScopeSpec *SS, 1873 NamedDecl *FirstQualifierInScope) { 1874 if (SS && SS->isInvalid()) 1875 return ExprError(); 1876 1877 // Since this might be a postfix expression, get rid of ParenListExprs. 1878 Base = MaybeConvertParenListExprToParenExpr(S, move(Base)); 1879 1880 Expr *BaseExpr = Base.takeAs<Expr>(); 1881 assert(BaseExpr && "no base expression"); 1882 1883 // Perform default conversions. 1884 DefaultFunctionArrayConversion(BaseExpr); 1885 1886 QualType BaseType = BaseExpr->getType(); 1887 // If this is an Objective-C pseudo-builtin and a definition is provided then 1888 // use that. 1889 if (BaseType->isObjCIdType()) { 1890 // We have an 'id' type. Rather than fall through, we check if this 1891 // is a reference to 'isa'. 1892 if (BaseType != Context.ObjCIdRedefinitionType) { 1893 BaseType = Context.ObjCIdRedefinitionType; 1894 ImpCastExprToType(BaseExpr, BaseType, CastExpr::CK_BitCast); 1895 } 1896 } 1897 assert(!BaseType.isNull() && "no type for member expression"); 1898 1899 // Handle properties on ObjC 'Class' types. 1900 if (OpKind == tok::period && BaseType->isObjCClassType()) { 1901 // Also must look for a getter name which uses property syntax. 1902 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1903 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1904 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 1905 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 1906 ObjCMethodDecl *Getter; 1907 // FIXME: need to also look locally in the implementation. 1908 if ((Getter = IFace->lookupClassMethod(Sel))) { 1909 // Check the use of this method. 1910 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1911 return ExprError(); 1912 } 1913 // If we found a getter then this may be a valid dot-reference, we 1914 // will look for the matching setter, in case it is needed. 1915 Selector SetterSel = 1916 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1917 PP.getSelectorTable(), Member); 1918 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 1919 if (!Setter) { 1920 // If this reference is in an @implementation, also check for 'private' 1921 // methods. 1922 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 1923 } 1924 // Look through local category implementations associated with the class. 1925 if (!Setter) 1926 Setter = IFace->getCategoryClassMethod(SetterSel); 1927 1928 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1929 return ExprError(); 1930 1931 if (Getter || Setter) { 1932 QualType PType; 1933 1934 if (Getter) 1935 PType = Getter->getResultType(); 1936 else 1937 // Get the expression type from Setter's incoming parameter. 1938 PType = (*(Setter->param_end() -1))->getType(); 1939 // FIXME: we must check that the setter has property type. 1940 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, 1941 PType, 1942 Setter, MemberLoc, BaseExpr)); 1943 } 1944 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1945 << MemberName << BaseType); 1946 } 1947 } 1948 1949 if (BaseType->isObjCClassType() && 1950 BaseType != Context.ObjCClassRedefinitionType) { 1951 BaseType = Context.ObjCClassRedefinitionType; 1952 ImpCastExprToType(BaseExpr, BaseType, CastExpr::CK_BitCast); 1953 } 1954 1955 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1956 // must have pointer type, and the accessed type is the pointee. 1957 if (OpKind == tok::arrow) { 1958 if (BaseType->isDependentType()) { 1959 NestedNameSpecifier *Qualifier = 0; 1960 if (SS) { 1961 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 1962 if (!FirstQualifierInScope) 1963 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 1964 } 1965 1966 return Owned(CXXUnresolvedMemberExpr::Create(Context, BaseExpr, true, 1967 OpLoc, Qualifier, 1968 SS? SS->getRange() : SourceRange(), 1969 FirstQualifierInScope, 1970 MemberName, 1971 MemberLoc, 1972 HasExplicitTemplateArgs, 1973 LAngleLoc, 1974 ExplicitTemplateArgs, 1975 NumExplicitTemplateArgs, 1976 RAngleLoc)); 1977 } 1978 else if (const PointerType *PT = BaseType->getAs<PointerType>()) 1979 BaseType = PT->getPointeeType(); 1980 else if (BaseType->isObjCObjectPointerType()) 1981 ; 1982 else 1983 return ExprError(Diag(MemberLoc, 1984 diag::err_typecheck_member_reference_arrow) 1985 << BaseType << BaseExpr->getSourceRange()); 1986 } else if (BaseType->isDependentType()) { 1987 // Require that the base type isn't a pointer type 1988 // (so we'll report an error for) 1989 // T* t; 1990 // t.f; 1991 // 1992 // In Obj-C++, however, the above expression is valid, since it could be 1993 // accessing the 'f' property if T is an Obj-C interface. The extra check 1994 // allows this, while still reporting an error if T is a struct pointer. 1995 const PointerType *PT = BaseType->getAs<PointerType>(); 1996 1997 if (!PT || (getLangOptions().ObjC1 && 1998 !PT->getPointeeType()->isRecordType())) { 1999 NestedNameSpecifier *Qualifier = 0; 2000 if (SS) { 2001 Qualifier = static_cast<NestedNameSpecifier *>(SS->getScopeRep()); 2002 if (!FirstQualifierInScope) 2003 FirstQualifierInScope = FindFirstQualifierInScope(S, Qualifier); 2004 } 2005 2006 return Owned(CXXUnresolvedMemberExpr::Create(Context, 2007 BaseExpr, false, 2008 OpLoc, 2009 Qualifier, 2010 SS? SS->getRange() : SourceRange(), 2011 FirstQualifierInScope, 2012 MemberName, 2013 MemberLoc, 2014 HasExplicitTemplateArgs, 2015 LAngleLoc, 2016 ExplicitTemplateArgs, 2017 NumExplicitTemplateArgs, 2018 RAngleLoc)); 2019 } 2020 } 2021 2022 // Handle field access to simple records. This also handles access to fields 2023 // of the ObjC 'id' struct. 2024 if (const RecordType *RTy = BaseType->getAs<RecordType>()) { 2025 RecordDecl *RDecl = RTy->getDecl(); 2026 if (RequireCompleteType(OpLoc, BaseType, 2027 PDiag(diag::err_typecheck_incomplete_tag) 2028 << BaseExpr->getSourceRange())) 2029 return ExprError(); 2030 2031 DeclContext *DC = RDecl; 2032 if (SS && SS->isSet()) { 2033 // If the member name was a qualified-id, look into the 2034 // nested-name-specifier. 2035 DC = computeDeclContext(*SS, false); 2036 2037 if (!isa<TypeDecl>(DC)) { 2038 Diag(MemberLoc, diag::err_qualified_member_nonclass) 2039 << DC << SS->getRange(); 2040 return ExprError(); 2041 } 2042 2043 // FIXME: If DC is not computable, we should build a 2044 // CXXUnresolvedMemberExpr. 2045 assert(DC && "Cannot handle non-computable dependent contexts in lookup"); 2046 } 2047 2048 // The record definition is complete, now make sure the member is valid. 2049 LookupResult Result; 2050 LookupQualifiedName(Result, DC, MemberName, LookupMemberName, false); 2051 2052 if (Result.empty()) 2053 return ExprError(Diag(MemberLoc, diag::err_no_member) 2054 << MemberName << DC << BaseExpr->getSourceRange()); 2055 if (Result.isAmbiguous()) { 2056 DiagnoseAmbiguousLookup(Result, MemberName, MemberLoc, 2057 BaseExpr->getSourceRange()); 2058 return ExprError(); 2059 } 2060 2061 NamedDecl *MemberDecl = Result.getAsSingleDecl(Context); 2062 2063 if (SS && SS->isSet()) { 2064 TypeDecl* TyD = cast<TypeDecl>(MemberDecl->getDeclContext()); 2065 QualType BaseTypeCanon 2066 = Context.getCanonicalType(BaseType).getUnqualifiedType(); 2067 QualType MemberTypeCanon 2068 = Context.getCanonicalType(Context.getTypeDeclType(TyD)); 2069 2070 if (BaseTypeCanon != MemberTypeCanon && 2071 !IsDerivedFrom(BaseTypeCanon, MemberTypeCanon)) 2072 return ExprError(Diag(SS->getBeginLoc(), 2073 diag::err_not_direct_base_or_virtual) 2074 << MemberTypeCanon << BaseTypeCanon); 2075 } 2076 2077 // If the decl being referenced had an error, return an error for this 2078 // sub-expr without emitting another error, in order to avoid cascading 2079 // error cases. 2080 if (MemberDecl->isInvalidDecl()) 2081 return ExprError(); 2082 2083 bool ShouldCheckUse = true; 2084 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) { 2085 // Don't diagnose the use of a virtual member function unless it's 2086 // explicitly qualified. 2087 if (MD->isVirtual() && (!SS || !SS->isSet())) 2088 ShouldCheckUse = false; 2089 } 2090 2091 // Check the use of this field 2092 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 2093 return ExprError(); 2094 2095 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 2096 // We may have found a field within an anonymous union or struct 2097 // (C++ [class.union]). 2098 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 2099 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 2100 BaseExpr, OpLoc); 2101 2102 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 2103 QualType MemberType = FD->getType(); 2104 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) 2105 MemberType = Ref->getPointeeType(); 2106 else { 2107 Qualifiers BaseQuals = BaseType.getQualifiers(); 2108 BaseQuals.removeObjCGCAttr(); 2109 if (FD->isMutable()) BaseQuals.removeConst(); 2110 2111 Qualifiers MemberQuals 2112 = Context.getCanonicalType(MemberType).getQualifiers(); 2113 2114 Qualifiers Combined = BaseQuals + MemberQuals; 2115 if (Combined != MemberQuals) 2116 MemberType = Context.getQualifiedType(MemberType, Combined); 2117 } 2118 2119 MarkDeclarationReferenced(MemberLoc, FD); 2120 if (PerformObjectMemberConversion(BaseExpr, FD)) 2121 return ExprError(); 2122 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2123 FD, MemberLoc, MemberType)); 2124 } 2125 2126 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) { 2127 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2128 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2129 Var, MemberLoc, 2130 Var->getType().getNonReferenceType())); 2131 } 2132 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) { 2133 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2134 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2135 MemberFn, MemberLoc, 2136 MemberFn->getType())); 2137 } 2138 if (FunctionTemplateDecl *FunTmpl 2139 = dyn_cast<FunctionTemplateDecl>(MemberDecl)) { 2140 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2141 2142 if (HasExplicitTemplateArgs) 2143 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2144 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2145 SS? SS->getRange() : SourceRange(), 2146 FunTmpl, MemberLoc, true, 2147 LAngleLoc, ExplicitTemplateArgs, 2148 NumExplicitTemplateArgs, RAngleLoc, 2149 Context.OverloadTy)); 2150 2151 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2152 FunTmpl, MemberLoc, 2153 Context.OverloadTy)); 2154 } 2155 if (OverloadedFunctionDecl *Ovl 2156 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) { 2157 if (HasExplicitTemplateArgs) 2158 return Owned(MemberExpr::Create(Context, BaseExpr, OpKind == tok::arrow, 2159 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2160 SS? SS->getRange() : SourceRange(), 2161 Ovl, MemberLoc, true, 2162 LAngleLoc, ExplicitTemplateArgs, 2163 NumExplicitTemplateArgs, RAngleLoc, 2164 Context.OverloadTy)); 2165 2166 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2167 Ovl, MemberLoc, Context.OverloadTy)); 2168 } 2169 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) { 2170 MarkDeclarationReferenced(MemberLoc, MemberDecl); 2171 return Owned(BuildMemberExpr(Context, BaseExpr, OpKind == tok::arrow, SS, 2172 Enum, MemberLoc, Enum->getType())); 2173 } 2174 if (isa<TypeDecl>(MemberDecl)) 2175 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 2176 << MemberName << int(OpKind == tok::arrow)); 2177 2178 // We found a declaration kind that we didn't expect. This is a 2179 // generic error message that tells the user that she can't refer 2180 // to this member with '.' or '->'. 2181 return ExprError(Diag(MemberLoc, 2182 diag::err_typecheck_member_reference_unknown) 2183 << MemberName << int(OpKind == tok::arrow)); 2184 } 2185 2186 // Handle pseudo-destructors (C++ [expr.pseudo]). Since anything referring 2187 // into a record type was handled above, any destructor we see here is a 2188 // pseudo-destructor. 2189 if (MemberName.getNameKind() == DeclarationName::CXXDestructorName) { 2190 // C++ [expr.pseudo]p2: 2191 // The left hand side of the dot operator shall be of scalar type. The 2192 // left hand side of the arrow operator shall be of pointer to scalar 2193 // type. 2194 if (!BaseType->isScalarType()) 2195 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_base_not_scalar) 2196 << BaseType << BaseExpr->getSourceRange()); 2197 2198 // [...] The type designated by the pseudo-destructor-name shall be the 2199 // same as the object type. 2200 if (!MemberName.getCXXNameType()->isDependentType() && 2201 !Context.hasSameUnqualifiedType(BaseType, MemberName.getCXXNameType())) 2202 return Owned(Diag(OpLoc, diag::err_pseudo_dtor_type_mismatch) 2203 << BaseType << MemberName.getCXXNameType() 2204 << BaseExpr->getSourceRange() << SourceRange(MemberLoc)); 2205 2206 // [...] Furthermore, the two type-names in a pseudo-destructor-name of 2207 // the form 2208 // 2209 // ::[opt] nested-name-specifier[opt] type-name :: ̃ type-name 2210 // 2211 // shall designate the same scalar type. 2212 // 2213 // FIXME: DPG can't see any way to trigger this particular clause, so it 2214 // isn't checked here. 2215 2216 // FIXME: We've lost the precise spelling of the type by going through 2217 // DeclarationName. Can we do better? 2218 return Owned(new (Context) CXXPseudoDestructorExpr(Context, BaseExpr, 2219 OpKind == tok::arrow, 2220 OpLoc, 2221 (NestedNameSpecifier *)(SS? SS->getScopeRep() : 0), 2222 SS? SS->getRange() : SourceRange(), 2223 MemberName.getCXXNameType(), 2224 MemberLoc)); 2225 } 2226 2227 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 2228 // (*Obj).ivar. 2229 if ((OpKind == tok::arrow && BaseType->isObjCObjectPointerType()) || 2230 (OpKind == tok::period && BaseType->isObjCInterfaceType())) { 2231 const ObjCObjectPointerType *OPT = BaseType->getAs<ObjCObjectPointerType>(); 2232 const ObjCInterfaceType *IFaceT = 2233 OPT ? OPT->getInterfaceType() : BaseType->getAs<ObjCInterfaceType>(); 2234 if (IFaceT) { 2235 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2236 2237 ObjCInterfaceDecl *IDecl = IFaceT->getDecl(); 2238 ObjCInterfaceDecl *ClassDeclared; 2239 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared); 2240 2241 if (IV) { 2242 // If the decl being referenced had an error, return an error for this 2243 // sub-expr without emitting another error, in order to avoid cascading 2244 // error cases. 2245 if (IV->isInvalidDecl()) 2246 return ExprError(); 2247 2248 // Check whether we can reference this field. 2249 if (DiagnoseUseOfDecl(IV, MemberLoc)) 2250 return ExprError(); 2251 if (IV->getAccessControl() != ObjCIvarDecl::Public && 2252 IV->getAccessControl() != ObjCIvarDecl::Package) { 2253 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 2254 if (ObjCMethodDecl *MD = getCurMethodDecl()) 2255 ClassOfMethodDecl = MD->getClassInterface(); 2256 else if (ObjCImpDecl && getCurFunctionDecl()) { 2257 // Case of a c-function declared inside an objc implementation. 2258 // FIXME: For a c-style function nested inside an objc implementation 2259 // class, there is no implementation context available, so we pass 2260 // down the context as argument to this routine. Ideally, this context 2261 // need be passed down in the AST node and somehow calculated from the 2262 // AST for a function decl. 2263 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 2264 if (ObjCImplementationDecl *IMPD = 2265 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 2266 ClassOfMethodDecl = IMPD->getClassInterface(); 2267 else if (ObjCCategoryImplDecl* CatImplClass = 2268 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 2269 ClassOfMethodDecl = CatImplClass->getClassInterface(); 2270 } 2271 2272 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 2273 if (ClassDeclared != IDecl || 2274 ClassOfMethodDecl != ClassDeclared) 2275 Diag(MemberLoc, diag::error_private_ivar_access) 2276 << IV->getDeclName(); 2277 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl)) 2278 // @protected 2279 Diag(MemberLoc, diag::error_protected_ivar_access) 2280 << IV->getDeclName(); 2281 } 2282 2283 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 2284 MemberLoc, BaseExpr, 2285 OpKind == tok::arrow)); 2286 } 2287 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 2288 << IDecl->getDeclName() << MemberName 2289 << BaseExpr->getSourceRange()); 2290 } 2291 } 2292 // Handle properties on 'id' and qualified "id". 2293 if (OpKind == tok::period && (BaseType->isObjCIdType() || 2294 BaseType->isObjCQualifiedIdType())) { 2295 const ObjCObjectPointerType *QIdTy = BaseType->getAs<ObjCObjectPointerType>(); 2296 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2297 2298 // Check protocols on qualified interfaces. 2299 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2300 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2301 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2302 // Check the use of this declaration 2303 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2304 return ExprError(); 2305 2306 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2307 MemberLoc, BaseExpr)); 2308 } 2309 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2310 // Check the use of this method. 2311 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2312 return ExprError(); 2313 2314 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2315 OMD->getResultType(), 2316 OMD, OpLoc, MemberLoc, 2317 NULL, 0)); 2318 } 2319 } 2320 2321 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2322 << MemberName << BaseType); 2323 } 2324 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2325 // pointer to a (potentially qualified) interface type. 2326 const ObjCObjectPointerType *OPT; 2327 if (OpKind == tok::period && 2328 (OPT = BaseType->getAsObjCInterfacePointerType())) { 2329 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 2330 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 2331 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2332 2333 // Search for a declared property first. 2334 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 2335 // Check whether we can reference this property. 2336 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2337 return ExprError(); 2338 QualType ResTy = PD->getType(); 2339 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2340 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2341 if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)) 2342 ResTy = Getter->getResultType(); 2343 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy, 2344 MemberLoc, BaseExpr)); 2345 } 2346 // Check protocols on qualified interfaces. 2347 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2348 E = OPT->qual_end(); I != E; ++I) 2349 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2350 // Check whether we can reference this property. 2351 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2352 return ExprError(); 2353 2354 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2355 MemberLoc, BaseExpr)); 2356 } 2357 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 2358 E = OPT->qual_end(); I != E; ++I) 2359 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 2360 // Check whether we can reference this property. 2361 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2362 return ExprError(); 2363 2364 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2365 MemberLoc, BaseExpr)); 2366 } 2367 // If that failed, look for an "implicit" property by seeing if the nullary 2368 // selector is implemented. 2369 2370 // FIXME: The logic for looking up nullary and unary selectors should be 2371 // shared with the code in ActOnInstanceMessage. 2372 2373 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 2374 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 2375 2376 // If this reference is in an @implementation, check for 'private' methods. 2377 if (!Getter) 2378 Getter = IFace->lookupPrivateInstanceMethod(Sel); 2379 2380 // Look through local category implementations associated with the class. 2381 if (!Getter) 2382 Getter = IFace->getCategoryInstanceMethod(Sel); 2383 if (Getter) { 2384 // Check if we can reference this property. 2385 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2386 return ExprError(); 2387 } 2388 // If we found a getter then this may be a valid dot-reference, we 2389 // will look for the matching setter, in case it is needed. 2390 Selector SetterSel = 2391 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2392 PP.getSelectorTable(), Member); 2393 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 2394 if (!Setter) { 2395 // If this reference is in an @implementation, also check for 'private' 2396 // methods. 2397 Setter = IFace->lookupPrivateInstanceMethod(SetterSel); 2398 } 2399 // Look through local category implementations associated with the class. 2400 if (!Setter) 2401 Setter = IFace->getCategoryInstanceMethod(SetterSel); 2402 2403 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2404 return ExprError(); 2405 2406 if (Getter || Setter) { 2407 QualType PType; 2408 2409 if (Getter) 2410 PType = Getter->getResultType(); 2411 else 2412 // Get the expression type from Setter's incoming parameter. 2413 PType = (*(Setter->param_end() -1))->getType(); 2414 // FIXME: we must check that the setter has property type. 2415 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType, 2416 Setter, MemberLoc, BaseExpr)); 2417 } 2418 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2419 << MemberName << BaseType); 2420 } 2421 2422 // Handle the following exceptional case (*Obj).isa. 2423 if (OpKind == tok::period && 2424 BaseType->isSpecificBuiltinType(BuiltinType::ObjCId) && 2425 MemberName.getAsIdentifierInfo()->isStr("isa")) 2426 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc, 2427 Context.getObjCIdType())); 2428 2429 // Handle 'field access' to vectors, such as 'V.xx'. 2430 if (BaseType->isExtVectorType()) { 2431 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 2432 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2433 if (ret.isNull()) 2434 return ExprError(); 2435 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, *Member, 2436 MemberLoc)); 2437 } 2438 2439 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2440 << BaseType << BaseExpr->getSourceRange(); 2441 2442 // If the user is trying to apply -> or . to a function or function 2443 // pointer, it's probably because they forgot parentheses to call 2444 // the function. Suggest the addition of those parentheses. 2445 if (BaseType == Context.OverloadTy || 2446 BaseType->isFunctionType() || 2447 (BaseType->isPointerType() && 2448 BaseType->getAs<PointerType>()->isFunctionType())) { 2449 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2450 Diag(Loc, diag::note_member_reference_needs_call) 2451 << CodeModificationHint::CreateInsertion(Loc, "()"); 2452 } 2453 2454 return ExprError(); 2455} 2456 2457Sema::OwningExprResult Sema::ActOnMemberAccessExpr(Scope *S, ExprArg Base, 2458 SourceLocation OpLoc, 2459 tok::TokenKind OpKind, 2460 const CXXScopeSpec &SS, 2461 UnqualifiedId &Member, 2462 DeclPtrTy ObjCImpDecl, 2463 bool HasTrailingLParen) { 2464 if (Member.getKind() == UnqualifiedId::IK_TemplateId) { 2465 TemplateName Template 2466 = TemplateName::getFromVoidPointer(Member.TemplateId->Template); 2467 2468 // FIXME: We're going to end up looking up the template based on its name, 2469 // twice! 2470 DeclarationName Name; 2471 if (TemplateDecl *ActualTemplate = Template.getAsTemplateDecl()) 2472 Name = ActualTemplate->getDeclName(); 2473 else if (OverloadedFunctionDecl *Ovl = Template.getAsOverloadedFunctionDecl()) 2474 Name = Ovl->getDeclName(); 2475 else { 2476 DependentTemplateName *DTN = Template.getAsDependentTemplateName(); 2477 if (DTN->isIdentifier()) 2478 Name = DTN->getIdentifier(); 2479 else 2480 Name = Context.DeclarationNames.getCXXOperatorName(DTN->getOperator()); 2481 } 2482 2483 // Translate the parser's template argument list in our AST format. 2484 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2485 Member.TemplateId->getTemplateArgs(), 2486 Member.TemplateId->getTemplateArgIsType(), 2487 Member.TemplateId->NumArgs); 2488 2489 llvm::SmallVector<TemplateArgumentLoc, 16> TemplateArgs; 2490 translateTemplateArguments(TemplateArgsPtr, 2491 Member.TemplateId->getTemplateArgLocations(), 2492 TemplateArgs); 2493 TemplateArgsPtr.release(); 2494 2495 // Do we have the save the actual template name? We might need it... 2496 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, 2497 Member.TemplateId->TemplateNameLoc, 2498 Name, true, Member.TemplateId->LAngleLoc, 2499 TemplateArgs.data(), TemplateArgs.size(), 2500 Member.TemplateId->RAngleLoc, DeclPtrTy(), 2501 &SS); 2502 } 2503 2504 // FIXME: We lose a lot of source information by mapping directly to the 2505 // DeclarationName. 2506 OwningExprResult Result 2507 = BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, 2508 Member.getSourceRange().getBegin(), 2509 GetNameFromUnqualifiedId(Member), 2510 ObjCImpDecl, &SS); 2511 2512 if (Result.isInvalid() || HasTrailingLParen || 2513 Member.getKind() != UnqualifiedId::IK_DestructorName) 2514 return move(Result); 2515 2516 // The only way a reference to a destructor can be used is to 2517 // immediately call them. Since the next token is not a '(', produce a 2518 // diagnostic and build the call now. 2519 Expr *E = (Expr *)Result.get(); 2520 SourceLocation ExpectedLParenLoc 2521 = PP.getLocForEndOfToken(Member.getSourceRange().getEnd()); 2522 Diag(E->getLocStart(), diag::err_dtor_expr_without_call) 2523 << isa<CXXPseudoDestructorExpr>(E) 2524 << CodeModificationHint::CreateInsertion(ExpectedLParenLoc, "()"); 2525 2526 return ActOnCallExpr(0, move(Result), ExpectedLParenLoc, 2527 MultiExprArg(*this, 0, 0), 0, ExpectedLParenLoc); 2528} 2529 2530Sema::OwningExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc, 2531 FunctionDecl *FD, 2532 ParmVarDecl *Param) { 2533 if (Param->hasUnparsedDefaultArg()) { 2534 Diag (CallLoc, 2535 diag::err_use_of_default_argument_to_function_declared_later) << 2536 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName(); 2537 Diag(UnparsedDefaultArgLocs[Param], 2538 diag::note_default_argument_declared_here); 2539 } else { 2540 if (Param->hasUninstantiatedDefaultArg()) { 2541 Expr *UninstExpr = Param->getUninstantiatedDefaultArg(); 2542 2543 // Instantiate the expression. 2544 MultiLevelTemplateArgumentList ArgList = getTemplateInstantiationArgs(FD); 2545 2546 InstantiatingTemplate Inst(*this, CallLoc, Param, 2547 ArgList.getInnermost().getFlatArgumentList(), 2548 ArgList.getInnermost().flat_size()); 2549 2550 OwningExprResult Result = SubstExpr(UninstExpr, ArgList); 2551 if (Result.isInvalid()) 2552 return ExprError(); 2553 2554 if (SetParamDefaultArgument(Param, move(Result), 2555 /*FIXME:EqualLoc*/ 2556 UninstExpr->getSourceRange().getBegin())) 2557 return ExprError(); 2558 } 2559 2560 Expr *DefaultExpr = Param->getDefaultArg(); 2561 2562 // If the default expression creates temporaries, we need to 2563 // push them to the current stack of expression temporaries so they'll 2564 // be properly destroyed. 2565 if (CXXExprWithTemporaries *E 2566 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2567 assert(!E->shouldDestroyTemporaries() && 2568 "Can't destroy temporaries in a default argument expr!"); 2569 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2570 ExprTemporaries.push_back(E->getTemporary(I)); 2571 } 2572 } 2573 2574 // We already type-checked the argument, so we know it works. 2575 return Owned(CXXDefaultArgExpr::Create(Context, Param)); 2576} 2577 2578/// ConvertArgumentsForCall - Converts the arguments specified in 2579/// Args/NumArgs to the parameter types of the function FDecl with 2580/// function prototype Proto. Call is the call expression itself, and 2581/// Fn is the function expression. For a C++ member function, this 2582/// routine does not attempt to convert the object argument. Returns 2583/// true if the call is ill-formed. 2584bool 2585Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2586 FunctionDecl *FDecl, 2587 const FunctionProtoType *Proto, 2588 Expr **Args, unsigned NumArgs, 2589 SourceLocation RParenLoc) { 2590 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2591 // assignment, to the types of the corresponding parameter, ... 2592 unsigned NumArgsInProto = Proto->getNumArgs(); 2593 unsigned NumArgsToCheck = NumArgs; 2594 bool Invalid = false; 2595 2596 // If too few arguments are available (and we don't have default 2597 // arguments for the remaining parameters), don't make the call. 2598 if (NumArgs < NumArgsInProto) { 2599 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2600 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2601 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2602 // Use default arguments for missing arguments 2603 NumArgsToCheck = NumArgsInProto; 2604 Call->setNumArgs(Context, NumArgsInProto); 2605 } 2606 2607 // If too many are passed and not variadic, error on the extras and drop 2608 // them. 2609 if (NumArgs > NumArgsInProto) { 2610 if (!Proto->isVariadic()) { 2611 Diag(Args[NumArgsInProto]->getLocStart(), 2612 diag::err_typecheck_call_too_many_args) 2613 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2614 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2615 Args[NumArgs-1]->getLocEnd()); 2616 // This deletes the extra arguments. 2617 Call->setNumArgs(Context, NumArgsInProto); 2618 Invalid = true; 2619 } 2620 NumArgsToCheck = NumArgsInProto; 2621 } 2622 2623 // Continue to check argument types (even if we have too few/many args). 2624 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2625 QualType ProtoArgType = Proto->getArgType(i); 2626 2627 Expr *Arg; 2628 if (i < NumArgs) { 2629 Arg = Args[i]; 2630 2631 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2632 ProtoArgType, 2633 PDiag(diag::err_call_incomplete_argument) 2634 << Arg->getSourceRange())) 2635 return true; 2636 2637 // Pass the argument. 2638 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2639 return true; 2640 } else { 2641 ParmVarDecl *Param = FDecl->getParamDecl(i); 2642 2643 OwningExprResult ArgExpr = 2644 BuildCXXDefaultArgExpr(Call->getSourceRange().getBegin(), 2645 FDecl, Param); 2646 if (ArgExpr.isInvalid()) 2647 return true; 2648 2649 Arg = ArgExpr.takeAs<Expr>(); 2650 } 2651 2652 Call->setArg(i, Arg); 2653 } 2654 2655 // If this is a variadic call, handle args passed through "...". 2656 if (Proto->isVariadic()) { 2657 VariadicCallType CallType = VariadicFunction; 2658 if (Fn->getType()->isBlockPointerType()) 2659 CallType = VariadicBlock; // Block 2660 else if (isa<MemberExpr>(Fn)) 2661 CallType = VariadicMethod; 2662 2663 // Promote the arguments (C99 6.5.2.2p7). 2664 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2665 Expr *Arg = Args[i]; 2666 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2667 Call->setArg(i, Arg); 2668 } 2669 } 2670 2671 return Invalid; 2672} 2673 2674/// \brief "Deconstruct" the function argument of a call expression to find 2675/// the underlying declaration (if any), the name of the called function, 2676/// whether argument-dependent lookup is available, whether it has explicit 2677/// template arguments, etc. 2678void Sema::DeconstructCallFunction(Expr *FnExpr, 2679 NamedDecl *&Function, 2680 DeclarationName &Name, 2681 NestedNameSpecifier *&Qualifier, 2682 SourceRange &QualifierRange, 2683 bool &ArgumentDependentLookup, 2684 bool &HasExplicitTemplateArguments, 2685 const TemplateArgumentLoc *&ExplicitTemplateArgs, 2686 unsigned &NumExplicitTemplateArgs) { 2687 // Set defaults for all of the output parameters. 2688 Function = 0; 2689 Name = DeclarationName(); 2690 Qualifier = 0; 2691 QualifierRange = SourceRange(); 2692 ArgumentDependentLookup = getLangOptions().CPlusPlus; 2693 HasExplicitTemplateArguments = false; 2694 2695 // If we're directly calling a function, get the appropriate declaration. 2696 // Also, in C++, keep track of whether we should perform argument-dependent 2697 // lookup and whether there were any explicitly-specified template arguments. 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 ArgumentDependentLookup = 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 Function = dyn_cast<NamedDecl>(DRExpr->getDecl()); 2712 if ((Qualifier = DRExpr->getQualifier())) { 2713 ArgumentDependentLookup = false; 2714 QualifierRange = DRExpr->getQualifierRange(); 2715 } 2716 break; 2717 } else if (UnresolvedFunctionNameExpr *DepName 2718 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2719 Name = DepName->getName(); 2720 break; 2721 } else if (TemplateIdRefExpr *TemplateIdRef 2722 = dyn_cast<TemplateIdRefExpr>(FnExpr)) { 2723 Function = TemplateIdRef->getTemplateName().getAsTemplateDecl(); 2724 if (!Function) 2725 Function = TemplateIdRef->getTemplateName().getAsOverloadedFunctionDecl(); 2726 HasExplicitTemplateArguments = true; 2727 ExplicitTemplateArgs = TemplateIdRef->getTemplateArgs(); 2728 NumExplicitTemplateArgs = TemplateIdRef->getNumTemplateArgs(); 2729 2730 // C++ [temp.arg.explicit]p6: 2731 // [Note: For simple function names, argument dependent lookup (3.4.2) 2732 // applies even when the function name is not visible within the 2733 // scope of the call. This is because the call still has the syntactic 2734 // form of a function call (3.4.1). But when a function template with 2735 // explicit template arguments is used, the call does not have the 2736 // correct syntactic form unless there is a function template with 2737 // that name visible at the point of the call. If no such name is 2738 // visible, the call is not syntactically well-formed and 2739 // argument-dependent lookup does not apply. If some such name is 2740 // visible, argument dependent lookup applies and additional function 2741 // templates may be found in other namespaces. 2742 // 2743 // The summary of this paragraph is that, if we get to this point and the 2744 // template-id was not a qualified name, then argument-dependent lookup 2745 // is still possible. 2746 if ((Qualifier = TemplateIdRef->getQualifier())) { 2747 ArgumentDependentLookup = false; 2748 QualifierRange = TemplateIdRef->getQualifierRange(); 2749 } 2750 break; 2751 } else { 2752 // Any kind of name that does not refer to a declaration (or 2753 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2754 ArgumentDependentLookup = false; 2755 break; 2756 } 2757 } 2758} 2759 2760/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2761/// This provides the location of the left/right parens and a list of comma 2762/// locations. 2763Action::OwningExprResult 2764Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2765 MultiExprArg args, 2766 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2767 unsigned NumArgs = args.size(); 2768 2769 // Since this might be a postfix expression, get rid of ParenListExprs. 2770 fn = MaybeConvertParenListExprToParenExpr(S, move(fn)); 2771 2772 Expr *Fn = fn.takeAs<Expr>(); 2773 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2774 assert(Fn && "no function call expression"); 2775 FunctionDecl *FDecl = NULL; 2776 NamedDecl *NDecl = NULL; 2777 DeclarationName UnqualifiedName; 2778 2779 if (getLangOptions().CPlusPlus) { 2780 // If this is a pseudo-destructor expression, build the call immediately. 2781 if (isa<CXXPseudoDestructorExpr>(Fn)) { 2782 if (NumArgs > 0) { 2783 // Pseudo-destructor calls should not have any arguments. 2784 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args) 2785 << CodeModificationHint::CreateRemoval( 2786 SourceRange(Args[0]->getLocStart(), 2787 Args[NumArgs-1]->getLocEnd())); 2788 2789 for (unsigned I = 0; I != NumArgs; ++I) 2790 Args[I]->Destroy(Context); 2791 2792 NumArgs = 0; 2793 } 2794 2795 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy, 2796 RParenLoc)); 2797 } 2798 2799 // Determine whether this is a dependent call inside a C++ template, 2800 // in which case we won't do any semantic analysis now. 2801 // FIXME: Will need to cache the results of name lookup (including ADL) in 2802 // Fn. 2803 bool Dependent = false; 2804 if (Fn->isTypeDependent()) 2805 Dependent = true; 2806 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2807 Dependent = true; 2808 2809 if (Dependent) 2810 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2811 Context.DependentTy, RParenLoc)); 2812 2813 // Determine whether this is a call to an object (C++ [over.call.object]). 2814 if (Fn->getType()->isRecordType()) 2815 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2816 CommaLocs, RParenLoc)); 2817 2818 // Determine whether this is a call to a member function. 2819 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) { 2820 NamedDecl *MemDecl = MemExpr->getMemberDecl(); 2821 if (isa<OverloadedFunctionDecl>(MemDecl) || 2822 isa<CXXMethodDecl>(MemDecl) || 2823 (isa<FunctionTemplateDecl>(MemDecl) && 2824 isa<CXXMethodDecl>( 2825 cast<FunctionTemplateDecl>(MemDecl)->getTemplatedDecl()))) 2826 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2827 CommaLocs, RParenLoc)); 2828 } 2829 2830 // Determine whether this is a call to a pointer-to-member function. 2831 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Fn->IgnoreParens())) { 2832 if (BO->getOpcode() == BinaryOperator::PtrMemD || 2833 BO->getOpcode() == BinaryOperator::PtrMemI) { 2834 if (const FunctionProtoType *FPT = 2835 dyn_cast<FunctionProtoType>(BO->getType())) { 2836 QualType ResultTy = FPT->getResultType().getNonReferenceType(); 2837 2838 ExprOwningPtr<CXXMemberCallExpr> 2839 TheCall(this, new (Context) CXXMemberCallExpr(Context, BO, Args, 2840 NumArgs, ResultTy, 2841 RParenLoc)); 2842 2843 if (CheckCallReturnType(FPT->getResultType(), 2844 BO->getRHS()->getSourceRange().getBegin(), 2845 TheCall.get(), 0)) 2846 return ExprError(); 2847 2848 if (ConvertArgumentsForCall(&*TheCall, BO, 0, FPT, Args, NumArgs, 2849 RParenLoc)) 2850 return ExprError(); 2851 2852 return Owned(MaybeBindToTemporary(TheCall.release()).release()); 2853 } 2854 return ExprError(Diag(Fn->getLocStart(), 2855 diag::err_typecheck_call_not_function) 2856 << Fn->getType() << Fn->getSourceRange()); 2857 } 2858 } 2859 } 2860 2861 // If we're directly calling a function, get the appropriate declaration. 2862 // Also, in C++, keep track of whether we should perform argument-dependent 2863 // lookup and whether there were any explicitly-specified template arguments. 2864 bool ADL = true; 2865 bool HasExplicitTemplateArgs = 0; 2866 const TemplateArgumentLoc *ExplicitTemplateArgs = 0; 2867 unsigned NumExplicitTemplateArgs = 0; 2868 NestedNameSpecifier *Qualifier = 0; 2869 SourceRange QualifierRange; 2870 DeconstructCallFunction(Fn, NDecl, UnqualifiedName, Qualifier, QualifierRange, 2871 ADL,HasExplicitTemplateArgs, ExplicitTemplateArgs, 2872 NumExplicitTemplateArgs); 2873 2874 OverloadedFunctionDecl *Ovl = 0; 2875 FunctionTemplateDecl *FunctionTemplate = 0; 2876 if (NDecl) { 2877 FDecl = dyn_cast<FunctionDecl>(NDecl); 2878 if ((FunctionTemplate = dyn_cast<FunctionTemplateDecl>(NDecl))) 2879 FDecl = FunctionTemplate->getTemplatedDecl(); 2880 else 2881 FDecl = dyn_cast<FunctionDecl>(NDecl); 2882 Ovl = dyn_cast<OverloadedFunctionDecl>(NDecl); 2883 } 2884 2885 if (Ovl || FunctionTemplate || 2886 (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2887 // We don't perform ADL for implicit declarations of builtins. 2888 if (FDecl && FDecl->getBuiltinID() && FDecl->isImplicit()) 2889 ADL = false; 2890 2891 // We don't perform ADL in C. 2892 if (!getLangOptions().CPlusPlus) 2893 ADL = false; 2894 2895 if (Ovl || FunctionTemplate || ADL) { 2896 FDecl = ResolveOverloadedCallFn(Fn, NDecl, UnqualifiedName, 2897 HasExplicitTemplateArgs, 2898 ExplicitTemplateArgs, 2899 NumExplicitTemplateArgs, 2900 LParenLoc, Args, NumArgs, CommaLocs, 2901 RParenLoc, ADL); 2902 if (!FDecl) 2903 return ExprError(); 2904 2905 Fn = FixOverloadedFunctionReference(Fn, FDecl); 2906 } 2907 } 2908 2909 // Promote the function operand. 2910 UsualUnaryConversions(Fn); 2911 2912 // Make the call expr early, before semantic checks. This guarantees cleanup 2913 // of arguments and function on error. 2914 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2915 Args, NumArgs, 2916 Context.BoolTy, 2917 RParenLoc)); 2918 2919 const FunctionType *FuncT; 2920 if (!Fn->getType()->isBlockPointerType()) { 2921 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2922 // have type pointer to function". 2923 const PointerType *PT = Fn->getType()->getAs<PointerType>(); 2924 if (PT == 0) 2925 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2926 << Fn->getType() << Fn->getSourceRange()); 2927 FuncT = PT->getPointeeType()->getAs<FunctionType>(); 2928 } else { // This is a block call. 2929 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()-> 2930 getAs<FunctionType>(); 2931 } 2932 if (FuncT == 0) 2933 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2934 << Fn->getType() << Fn->getSourceRange()); 2935 2936 // Check for a valid return type 2937 if (CheckCallReturnType(FuncT->getResultType(), 2938 Fn->getSourceRange().getBegin(), TheCall.get(), 2939 FDecl)) 2940 return ExprError(); 2941 2942 // We know the result type of the call, set it. 2943 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2944 2945 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2946 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2947 RParenLoc)) 2948 return ExprError(); 2949 } else { 2950 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2951 2952 if (FDecl) { 2953 // Check if we have too few/too many template arguments, based 2954 // on our knowledge of the function definition. 2955 const FunctionDecl *Def = 0; 2956 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) { 2957 const FunctionProtoType *Proto = 2958 Def->getType()->getAs<FunctionProtoType>(); 2959 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size())) { 2960 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2961 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2962 } 2963 } 2964 } 2965 2966 // Promote the arguments (C99 6.5.2.2p6). 2967 for (unsigned i = 0; i != NumArgs; i++) { 2968 Expr *Arg = Args[i]; 2969 DefaultArgumentPromotion(Arg); 2970 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2971 Arg->getType(), 2972 PDiag(diag::err_call_incomplete_argument) 2973 << Arg->getSourceRange())) 2974 return ExprError(); 2975 TheCall->setArg(i, Arg); 2976 } 2977 } 2978 2979 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2980 if (!Method->isStatic()) 2981 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2982 << Fn->getSourceRange()); 2983 2984 // Check for sentinels 2985 if (NDecl) 2986 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs); 2987 2988 // Do special checking on direct calls to functions. 2989 if (FDecl) { 2990 if (CheckFunctionCall(FDecl, TheCall.get())) 2991 return ExprError(); 2992 2993 if (unsigned BuiltinID = FDecl->getBuiltinID()) 2994 return CheckBuiltinFunctionCall(BuiltinID, TheCall.take()); 2995 } else if (NDecl) { 2996 if (CheckBlockCall(NDecl, TheCall.get())) 2997 return ExprError(); 2998 } 2999 3000 return MaybeBindToTemporary(TheCall.take()); 3001} 3002 3003Action::OwningExprResult 3004Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 3005 SourceLocation RParenLoc, ExprArg InitExpr) { 3006 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 3007 //FIXME: Preserve type source info. 3008 QualType literalType = GetTypeFromParser(Ty); 3009 // FIXME: put back this assert when initializers are worked out. 3010 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 3011 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 3012 3013 if (literalType->isArrayType()) { 3014 if (literalType->isVariableArrayType()) 3015 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 3016 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 3017 } else if (!literalType->isDependentType() && 3018 RequireCompleteType(LParenLoc, literalType, 3019 PDiag(diag::err_typecheck_decl_incomplete_type) 3020 << SourceRange(LParenLoc, 3021 literalExpr->getSourceRange().getEnd()))) 3022 return ExprError(); 3023 3024 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 3025 DeclarationName(), /*FIXME:DirectInit=*/false)) 3026 return ExprError(); 3027 3028 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 3029 if (isFileScope) { // 6.5.2.5p3 3030 if (CheckForConstantInitializer(literalExpr, literalType)) 3031 return ExprError(); 3032 } 3033 InitExpr.release(); 3034 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 3035 literalExpr, isFileScope)); 3036} 3037 3038Action::OwningExprResult 3039Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 3040 SourceLocation RBraceLoc) { 3041 unsigned NumInit = initlist.size(); 3042 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 3043 3044 // Semantic analysis for initializers is done by ActOnDeclarator() and 3045 // CheckInitializer() - it requires knowledge of the object being intialized. 3046 3047 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 3048 RBraceLoc); 3049 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 3050 return Owned(E); 3051} 3052 3053static CastExpr::CastKind getScalarCastKind(ASTContext &Context, 3054 QualType SrcTy, QualType DestTy) { 3055 if (Context.getCanonicalType(SrcTy).getUnqualifiedType() == 3056 Context.getCanonicalType(DestTy).getUnqualifiedType()) 3057 return CastExpr::CK_NoOp; 3058 3059 if (SrcTy->hasPointerRepresentation()) { 3060 if (DestTy->hasPointerRepresentation()) 3061 return CastExpr::CK_BitCast; 3062 if (DestTy->isIntegerType()) 3063 return CastExpr::CK_PointerToIntegral; 3064 } 3065 3066 if (SrcTy->isIntegerType()) { 3067 if (DestTy->isIntegerType()) 3068 return CastExpr::CK_IntegralCast; 3069 if (DestTy->hasPointerRepresentation()) 3070 return CastExpr::CK_IntegralToPointer; 3071 if (DestTy->isRealFloatingType()) 3072 return CastExpr::CK_IntegralToFloating; 3073 } 3074 3075 if (SrcTy->isRealFloatingType()) { 3076 if (DestTy->isRealFloatingType()) 3077 return CastExpr::CK_FloatingCast; 3078 if (DestTy->isIntegerType()) 3079 return CastExpr::CK_FloatingToIntegral; 3080 } 3081 3082 // FIXME: Assert here. 3083 // assert(false && "Unhandled cast combination!"); 3084 return CastExpr::CK_Unknown; 3085} 3086 3087/// CheckCastTypes - Check type constraints for casting between types. 3088bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr, 3089 CastExpr::CastKind& Kind, 3090 CXXMethodDecl *& ConversionDecl, 3091 bool FunctionalStyle) { 3092 if (getLangOptions().CPlusPlus) 3093 return CXXCheckCStyleCast(TyR, castType, castExpr, Kind, FunctionalStyle, 3094 ConversionDecl); 3095 3096 DefaultFunctionArrayConversion(castExpr); 3097 3098 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 3099 // type needs to be scalar. 3100 if (castType->isVoidType()) { 3101 // Cast to void allows any expr type. 3102 Kind = CastExpr::CK_ToVoid; 3103 return false; 3104 } 3105 3106 if (!castType->isScalarType() && !castType->isVectorType()) { 3107 if (Context.getCanonicalType(castType).getUnqualifiedType() == 3108 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 3109 (castType->isStructureType() || castType->isUnionType())) { 3110 // GCC struct/union extension: allow cast to self. 3111 // FIXME: Check that the cast destination type is complete. 3112 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 3113 << castType << castExpr->getSourceRange(); 3114 Kind = CastExpr::CK_NoOp; 3115 return false; 3116 } 3117 3118 if (castType->isUnionType()) { 3119 // GCC cast to union extension 3120 RecordDecl *RD = castType->getAs<RecordType>()->getDecl(); 3121 RecordDecl::field_iterator Field, FieldEnd; 3122 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 3123 Field != FieldEnd; ++Field) { 3124 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 3125 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 3126 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 3127 << castExpr->getSourceRange(); 3128 break; 3129 } 3130 } 3131 if (Field == FieldEnd) 3132 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 3133 << castExpr->getType() << castExpr->getSourceRange(); 3134 Kind = CastExpr::CK_ToUnion; 3135 return false; 3136 } 3137 3138 // Reject any other conversions to non-scalar types. 3139 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 3140 << castType << castExpr->getSourceRange(); 3141 } 3142 3143 if (!castExpr->getType()->isScalarType() && 3144 !castExpr->getType()->isVectorType()) { 3145 return Diag(castExpr->getLocStart(), 3146 diag::err_typecheck_expect_scalar_operand) 3147 << castExpr->getType() << castExpr->getSourceRange(); 3148 } 3149 3150 if (castType->isExtVectorType()) 3151 return CheckExtVectorCast(TyR, castType, castExpr, Kind); 3152 3153 if (castType->isVectorType()) 3154 return CheckVectorCast(TyR, castType, castExpr->getType(), Kind); 3155 if (castExpr->getType()->isVectorType()) 3156 return CheckVectorCast(TyR, castExpr->getType(), castType, Kind); 3157 3158 if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) 3159 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 3160 3161 if (isa<ObjCSelectorExpr>(castExpr)) 3162 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr); 3163 3164 if (!castType->isArithmeticType()) { 3165 QualType castExprType = castExpr->getType(); 3166 if (!castExprType->isIntegralType() && castExprType->isArithmeticType()) 3167 return Diag(castExpr->getLocStart(), 3168 diag::err_cast_pointer_from_non_pointer_int) 3169 << castExprType << castExpr->getSourceRange(); 3170 } else if (!castExpr->getType()->isArithmeticType()) { 3171 if (!castType->isIntegralType() && castType->isArithmeticType()) 3172 return Diag(castExpr->getLocStart(), 3173 diag::err_cast_pointer_to_non_pointer_int) 3174 << castType << castExpr->getSourceRange(); 3175 } 3176 3177 Kind = getScalarCastKind(Context, castExpr->getType(), castType); 3178 return false; 3179} 3180 3181bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty, 3182 CastExpr::CastKind &Kind) { 3183 assert(VectorTy->isVectorType() && "Not a vector type!"); 3184 3185 if (Ty->isVectorType() || Ty->isIntegerType()) { 3186 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 3187 return Diag(R.getBegin(), 3188 Ty->isVectorType() ? 3189 diag::err_invalid_conversion_between_vectors : 3190 diag::err_invalid_conversion_between_vector_and_integer) 3191 << VectorTy << Ty << R; 3192 } else 3193 return Diag(R.getBegin(), 3194 diag::err_invalid_conversion_between_vector_and_scalar) 3195 << VectorTy << Ty << R; 3196 3197 Kind = CastExpr::CK_BitCast; 3198 return false; 3199} 3200 3201bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *&CastExpr, 3202 CastExpr::CastKind &Kind) { 3203 assert(DestTy->isExtVectorType() && "Not an extended vector type!"); 3204 3205 QualType SrcTy = CastExpr->getType(); 3206 3207 // If SrcTy is a VectorType, the total size must match to explicitly cast to 3208 // an ExtVectorType. 3209 if (SrcTy->isVectorType()) { 3210 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy)) 3211 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors) 3212 << DestTy << SrcTy << R; 3213 Kind = CastExpr::CK_BitCast; 3214 return false; 3215 } 3216 3217 // All non-pointer scalars can be cast to ExtVector type. The appropriate 3218 // conversion will take place first from scalar to elt type, and then 3219 // splat from elt type to vector. 3220 if (SrcTy->isPointerType()) 3221 return Diag(R.getBegin(), 3222 diag::err_invalid_conversion_between_vector_and_scalar) 3223 << DestTy << SrcTy << R; 3224 3225 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType(); 3226 ImpCastExprToType(CastExpr, DestElemTy, 3227 getScalarCastKind(Context, SrcTy, DestElemTy)); 3228 3229 Kind = CastExpr::CK_VectorSplat; 3230 return false; 3231} 3232 3233Action::OwningExprResult 3234Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, TypeTy *Ty, 3235 SourceLocation RParenLoc, ExprArg Op) { 3236 CastExpr::CastKind Kind = CastExpr::CK_Unknown; 3237 3238 assert((Ty != 0) && (Op.get() != 0) && 3239 "ActOnCastExpr(): missing type or expr"); 3240 3241 Expr *castExpr = (Expr *)Op.get(); 3242 //FIXME: Preserve type source info. 3243 QualType castType = GetTypeFromParser(Ty); 3244 3245 // If the Expr being casted is a ParenListExpr, handle it specially. 3246 if (isa<ParenListExpr>(castExpr)) 3247 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, move(Op),castType); 3248 CXXMethodDecl *Method = 0; 3249 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr, 3250 Kind, Method)) 3251 return ExprError(); 3252 3253 if (Method) { 3254 OwningExprResult CastArg = BuildCXXCastArgument(LParenLoc, castType, Kind, 3255 Method, move(Op)); 3256 3257 if (CastArg.isInvalid()) 3258 return ExprError(); 3259 3260 castExpr = CastArg.takeAs<Expr>(); 3261 } else { 3262 Op.release(); 3263 } 3264 3265 return Owned(new (Context) CStyleCastExpr(castType.getNonReferenceType(), 3266 Kind, castExpr, castType, 3267 LParenLoc, RParenLoc)); 3268} 3269 3270/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence 3271/// of comma binary operators. 3272Action::OwningExprResult 3273Sema::MaybeConvertParenListExprToParenExpr(Scope *S, ExprArg EA) { 3274 Expr *expr = EA.takeAs<Expr>(); 3275 ParenListExpr *E = dyn_cast<ParenListExpr>(expr); 3276 if (!E) 3277 return Owned(expr); 3278 3279 OwningExprResult Result(*this, E->getExpr(0)); 3280 3281 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i) 3282 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, move(Result), 3283 Owned(E->getExpr(i))); 3284 3285 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), move(Result)); 3286} 3287 3288Action::OwningExprResult 3289Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc, 3290 SourceLocation RParenLoc, ExprArg Op, 3291 QualType Ty) { 3292 ParenListExpr *PE = (ParenListExpr *)Op.get(); 3293 3294 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')' 3295 // then handle it as such. 3296 if (getLangOptions().AltiVec && Ty->isVectorType()) { 3297 if (PE->getNumExprs() == 0) { 3298 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer); 3299 return ExprError(); 3300 } 3301 3302 llvm::SmallVector<Expr *, 8> initExprs; 3303 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i) 3304 initExprs.push_back(PE->getExpr(i)); 3305 3306 // FIXME: This means that pretty-printing the final AST will produce curly 3307 // braces instead of the original commas. 3308 Op.release(); 3309 InitListExpr *E = new (Context) InitListExpr(LParenLoc, &initExprs[0], 3310 initExprs.size(), RParenLoc); 3311 E->setType(Ty); 3312 return ActOnCompoundLiteral(LParenLoc, Ty.getAsOpaquePtr(), RParenLoc, 3313 Owned(E)); 3314 } else { 3315 // This is not an AltiVec-style cast, so turn the ParenListExpr into a 3316 // sequence of BinOp comma operators. 3317 Op = MaybeConvertParenListExprToParenExpr(S, move(Op)); 3318 return ActOnCastExpr(S, LParenLoc, Ty.getAsOpaquePtr(), RParenLoc,move(Op)); 3319 } 3320} 3321 3322Action::OwningExprResult Sema::ActOnParenListExpr(SourceLocation L, 3323 SourceLocation R, 3324 MultiExprArg Val) { 3325 unsigned nexprs = Val.size(); 3326 Expr **exprs = reinterpret_cast<Expr**>(Val.release()); 3327 assert((exprs != 0) && "ActOnParenListExpr() missing expr list"); 3328 Expr *expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R); 3329 return Owned(expr); 3330} 3331 3332/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 3333/// In that case, lhs = cond. 3334/// C99 6.5.15 3335QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 3336 SourceLocation QuestionLoc) { 3337 // C++ is sufficiently different to merit its own checker. 3338 if (getLangOptions().CPlusPlus) 3339 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 3340 3341 UsualUnaryConversions(Cond); 3342 UsualUnaryConversions(LHS); 3343 UsualUnaryConversions(RHS); 3344 QualType CondTy = Cond->getType(); 3345 QualType LHSTy = LHS->getType(); 3346 QualType RHSTy = RHS->getType(); 3347 3348 // first, check the condition. 3349 if (!CondTy->isScalarType()) { // C99 6.5.15p2 3350 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 3351 << CondTy; 3352 return QualType(); 3353 } 3354 3355 // Now check the two expressions. 3356 if (LHSTy->isVectorType() || RHSTy->isVectorType()) 3357 return CheckVectorOperands(QuestionLoc, LHS, RHS); 3358 3359 // If both operands have arithmetic type, do the usual arithmetic conversions 3360 // to find a common type: C99 6.5.15p3,5. 3361 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 3362 UsualArithmeticConversions(LHS, RHS); 3363 return LHS->getType(); 3364 } 3365 3366 // If both operands are the same structure or union type, the result is that 3367 // type. 3368 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3 3369 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>()) 3370 if (LHSRT->getDecl() == RHSRT->getDecl()) 3371 // "If both the operands have structure or union type, the result has 3372 // that type." This implies that CV qualifiers are dropped. 3373 return LHSTy.getUnqualifiedType(); 3374 // FIXME: Type of conditional expression must be complete in C mode. 3375 } 3376 3377 // C99 6.5.15p5: "If both operands have void type, the result has void type." 3378 // The following || allows only one side to be void (a GCC-ism). 3379 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 3380 if (!LHSTy->isVoidType()) 3381 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3382 << RHS->getSourceRange(); 3383 if (!RHSTy->isVoidType()) 3384 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 3385 << LHS->getSourceRange(); 3386 ImpCastExprToType(LHS, Context.VoidTy, CastExpr::CK_ToVoid); 3387 ImpCastExprToType(RHS, Context.VoidTy, CastExpr::CK_ToVoid); 3388 return Context.VoidTy; 3389 } 3390 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 3391 // the type of the other operand." 3392 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) && 3393 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3394 // promote the null to a pointer. 3395 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_Unknown); 3396 return LHSTy; 3397 } 3398 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) && 3399 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) { 3400 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_Unknown); 3401 return RHSTy; 3402 } 3403 // Handle things like Class and struct objc_class*. Here we case the result 3404 // to the pseudo-builtin, because that will be implicitly cast back to the 3405 // redefinition type if an attempt is made to access its fields. 3406 if (LHSTy->isObjCClassType() && 3407 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3408 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3409 return LHSTy; 3410 } 3411 if (RHSTy->isObjCClassType() && 3412 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) { 3413 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast); 3414 return RHSTy; 3415 } 3416 // And the same for struct objc_object* / id 3417 if (LHSTy->isObjCIdType() && 3418 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3419 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3420 return LHSTy; 3421 } 3422 if (RHSTy->isObjCIdType() && 3423 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) { 3424 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_BitCast); 3425 return RHSTy; 3426 } 3427 // Handle block pointer types. 3428 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) { 3429 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) { 3430 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) { 3431 QualType destType = Context.getPointerType(Context.VoidTy); 3432 ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast); 3433 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3434 return destType; 3435 } 3436 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3437 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3438 return QualType(); 3439 } 3440 // We have 2 block pointer types. 3441 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3442 // Two identical block pointer types are always compatible. 3443 return LHSTy; 3444 } 3445 // The block pointer types aren't identical, continue checking. 3446 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType(); 3447 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType(); 3448 3449 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3450 rhptee.getUnqualifiedType())) { 3451 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3452 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3453 // In this situation, we assume void* type. No especially good 3454 // reason, but this is what gcc does, and we do have to pick 3455 // to get a consistent AST. 3456 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3457 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3458 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3459 return incompatTy; 3460 } 3461 // The block pointer types are compatible. 3462 ImpCastExprToType(LHS, LHSTy, CastExpr::CK_BitCast); 3463 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3464 return LHSTy; 3465 } 3466 // Check constraints for Objective-C object pointers types. 3467 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) { 3468 3469 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3470 // Two identical object pointer types are always compatible. 3471 return LHSTy; 3472 } 3473 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>(); 3474 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>(); 3475 QualType compositeType = LHSTy; 3476 3477 // If both operands are interfaces and either operand can be 3478 // assigned to the other, use that type as the composite 3479 // type. This allows 3480 // xxx ? (A*) a : (B*) b 3481 // where B is a subclass of A. 3482 // 3483 // Additionally, as for assignment, if either type is 'id' 3484 // allow silent coercion. Finally, if the types are 3485 // incompatible then make sure to use 'id' as the composite 3486 // type so the result is acceptable for sending messages to. 3487 3488 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 3489 // It could return the composite type. 3490 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) { 3491 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy; 3492 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) { 3493 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy; 3494 } else if ((LHSTy->isObjCQualifiedIdType() || 3495 RHSTy->isObjCQualifiedIdType()) && 3496 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) { 3497 // Need to handle "id<xx>" explicitly. 3498 // GCC allows qualified id and any Objective-C type to devolve to 3499 // id. Currently localizing to here until clear this should be 3500 // part of ObjCQualifiedIdTypesAreCompatible. 3501 compositeType = Context.getObjCIdType(); 3502 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) { 3503 compositeType = Context.getObjCIdType(); 3504 } else if (!(compositeType = 3505 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull()) 3506 ; 3507 else { 3508 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands) 3509 << LHSTy << RHSTy 3510 << LHS->getSourceRange() << RHS->getSourceRange(); 3511 QualType incompatTy = Context.getObjCIdType(); 3512 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3513 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3514 return incompatTy; 3515 } 3516 // The object pointer types are compatible. 3517 ImpCastExprToType(LHS, compositeType, CastExpr::CK_BitCast); 3518 ImpCastExprToType(RHS, compositeType, CastExpr::CK_BitCast); 3519 return compositeType; 3520 } 3521 // Check Objective-C object pointer types and 'void *' 3522 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) { 3523 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3524 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3525 QualType destPointee 3526 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3527 QualType destType = Context.getPointerType(destPointee); 3528 // Add qualifiers if necessary. 3529 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3530 // Promote to void*. 3531 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3532 return destType; 3533 } 3534 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) { 3535 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType(); 3536 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3537 QualType destPointee 3538 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3539 QualType destType = Context.getPointerType(destPointee); 3540 // Add qualifiers if necessary. 3541 ImpCastExprToType(RHS, destType, CastExpr::CK_NoOp); 3542 // Promote to void*. 3543 ImpCastExprToType(LHS, destType, CastExpr::CK_BitCast); 3544 return destType; 3545 } 3546 // Check constraints for C object pointers types (C99 6.5.15p3,6). 3547 if (LHSTy->isPointerType() && RHSTy->isPointerType()) { 3548 // get the "pointed to" types 3549 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType(); 3550 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType(); 3551 3552 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 3553 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) { 3554 // Figure out necessary qualifiers (C99 6.5.15p6) 3555 QualType destPointee 3556 = Context.getQualifiedType(lhptee, rhptee.getQualifiers()); 3557 QualType destType = Context.getPointerType(destPointee); 3558 // Add qualifiers if necessary. 3559 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3560 // Promote to void*. 3561 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3562 return destType; 3563 } 3564 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 3565 QualType destPointee 3566 = Context.getQualifiedType(rhptee, lhptee.getQualifiers()); 3567 QualType destType = Context.getPointerType(destPointee); 3568 // Add qualifiers if necessary. 3569 ImpCastExprToType(LHS, destType, CastExpr::CK_NoOp); 3570 // Promote to void*. 3571 ImpCastExprToType(RHS, destType, CastExpr::CK_BitCast); 3572 return destType; 3573 } 3574 3575 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 3576 // Two identical pointer types are always compatible. 3577 return LHSTy; 3578 } 3579 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 3580 rhptee.getUnqualifiedType())) { 3581 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 3582 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3583 // In this situation, we assume void* type. No especially good 3584 // reason, but this is what gcc does, and we do have to pick 3585 // to get a consistent AST. 3586 QualType incompatTy = Context.getPointerType(Context.VoidTy); 3587 ImpCastExprToType(LHS, incompatTy, CastExpr::CK_BitCast); 3588 ImpCastExprToType(RHS, incompatTy, CastExpr::CK_BitCast); 3589 return incompatTy; 3590 } 3591 // The pointer types are compatible. 3592 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 3593 // differently qualified versions of compatible types, the result type is 3594 // a pointer to an appropriately qualified version of the *composite* 3595 // type. 3596 // FIXME: Need to calculate the composite type. 3597 // FIXME: Need to add qualifiers 3598 ImpCastExprToType(LHS, LHSTy, CastExpr::CK_BitCast); 3599 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_BitCast); 3600 return LHSTy; 3601 } 3602 3603 // GCC compatibility: soften pointer/integer mismatch. 3604 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 3605 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3606 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3607 ImpCastExprToType(LHS, RHSTy, CastExpr::CK_IntegralToPointer); 3608 return RHSTy; 3609 } 3610 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 3611 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 3612 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3613 ImpCastExprToType(RHS, LHSTy, CastExpr::CK_IntegralToPointer); 3614 return LHSTy; 3615 } 3616 3617 // Otherwise, the operands are not compatible. 3618 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 3619 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 3620 return QualType(); 3621} 3622 3623/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 3624/// in the case of a the GNU conditional expr extension. 3625Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 3626 SourceLocation ColonLoc, 3627 ExprArg Cond, ExprArg LHS, 3628 ExprArg RHS) { 3629 Expr *CondExpr = (Expr *) Cond.get(); 3630 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 3631 3632 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 3633 // was the condition. 3634 bool isLHSNull = LHSExpr == 0; 3635 if (isLHSNull) 3636 LHSExpr = CondExpr; 3637 3638 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 3639 RHSExpr, QuestionLoc); 3640 if (result.isNull()) 3641 return ExprError(); 3642 3643 Cond.release(); 3644 LHS.release(); 3645 RHS.release(); 3646 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc, 3647 isLHSNull ? 0 : LHSExpr, 3648 ColonLoc, RHSExpr, result)); 3649} 3650 3651// CheckPointerTypesForAssignment - This is a very tricky routine (despite 3652// being closely modeled after the C99 spec:-). The odd characteristic of this 3653// routine is it effectively iqnores the qualifiers on the top level pointee. 3654// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 3655// FIXME: add a couple examples in this comment. 3656Sema::AssignConvertType 3657Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 3658 QualType lhptee, rhptee; 3659 3660 if ((lhsType->isObjCClassType() && 3661 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3662 (rhsType->isObjCClassType() && 3663 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3664 return Compatible; 3665 } 3666 3667 // get the "pointed to" type (ignoring qualifiers at the top level) 3668 lhptee = lhsType->getAs<PointerType>()->getPointeeType(); 3669 rhptee = rhsType->getAs<PointerType>()->getPointeeType(); 3670 3671 // make sure we operate on the canonical type 3672 lhptee = Context.getCanonicalType(lhptee); 3673 rhptee = Context.getCanonicalType(rhptee); 3674 3675 AssignConvertType ConvTy = Compatible; 3676 3677 // C99 6.5.16.1p1: This following citation is common to constraints 3678 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 3679 // qualifiers of the type *pointed to* by the right; 3680 // FIXME: Handle ExtQualType 3681 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 3682 ConvTy = CompatiblePointerDiscardsQualifiers; 3683 3684 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 3685 // incomplete type and the other is a pointer to a qualified or unqualified 3686 // version of void... 3687 if (lhptee->isVoidType()) { 3688 if (rhptee->isIncompleteOrObjectType()) 3689 return ConvTy; 3690 3691 // As an extension, we allow cast to/from void* to function pointer. 3692 assert(rhptee->isFunctionType()); 3693 return FunctionVoidPointer; 3694 } 3695 3696 if (rhptee->isVoidType()) { 3697 if (lhptee->isIncompleteOrObjectType()) 3698 return ConvTy; 3699 3700 // As an extension, we allow cast to/from void* to function pointer. 3701 assert(lhptee->isFunctionType()); 3702 return FunctionVoidPointer; 3703 } 3704 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 3705 // unqualified versions of compatible types, ... 3706 lhptee = lhptee.getUnqualifiedType(); 3707 rhptee = rhptee.getUnqualifiedType(); 3708 if (!Context.typesAreCompatible(lhptee, rhptee)) { 3709 // Check if the pointee types are compatible ignoring the sign. 3710 // We explicitly check for char so that we catch "char" vs 3711 // "unsigned char" on systems where "char" is unsigned. 3712 if (lhptee->isCharType()) 3713 lhptee = Context.UnsignedCharTy; 3714 else if (lhptee->isSignedIntegerType()) 3715 lhptee = Context.getCorrespondingUnsignedType(lhptee); 3716 3717 if (rhptee->isCharType()) 3718 rhptee = Context.UnsignedCharTy; 3719 else if (rhptee->isSignedIntegerType()) 3720 rhptee = Context.getCorrespondingUnsignedType(rhptee); 3721 3722 if (lhptee == rhptee) { 3723 // Types are compatible ignoring the sign. Qualifier incompatibility 3724 // takes priority over sign incompatibility because the sign 3725 // warning can be disabled. 3726 if (ConvTy != Compatible) 3727 return ConvTy; 3728 return IncompatiblePointerSign; 3729 } 3730 // General pointer incompatibility takes priority over qualifiers. 3731 return IncompatiblePointer; 3732 } 3733 return ConvTy; 3734} 3735 3736/// CheckBlockPointerTypesForAssignment - This routine determines whether two 3737/// block pointer types are compatible or whether a block and normal pointer 3738/// are compatible. It is more restrict than comparing two function pointer 3739// types. 3740Sema::AssignConvertType 3741Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 3742 QualType rhsType) { 3743 QualType lhptee, rhptee; 3744 3745 // get the "pointed to" type (ignoring qualifiers at the top level) 3746 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType(); 3747 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType(); 3748 3749 // make sure we operate on the canonical type 3750 lhptee = Context.getCanonicalType(lhptee); 3751 rhptee = Context.getCanonicalType(rhptee); 3752 3753 AssignConvertType ConvTy = Compatible; 3754 3755 // For blocks we enforce that qualifiers are identical. 3756 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 3757 ConvTy = CompatiblePointerDiscardsQualifiers; 3758 3759 if (!Context.typesAreCompatible(lhptee, rhptee)) 3760 return IncompatibleBlockPointer; 3761 return ConvTy; 3762} 3763 3764/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 3765/// has code to accommodate several GCC extensions when type checking 3766/// pointers. Here are some objectionable examples that GCC considers warnings: 3767/// 3768/// int a, *pint; 3769/// short *pshort; 3770/// struct foo *pfoo; 3771/// 3772/// pint = pshort; // warning: assignment from incompatible pointer type 3773/// a = pint; // warning: assignment makes integer from pointer without a cast 3774/// pint = a; // warning: assignment makes pointer from integer without a cast 3775/// pint = pfoo; // warning: assignment from incompatible pointer type 3776/// 3777/// As a result, the code for dealing with pointers is more complex than the 3778/// C99 spec dictates. 3779/// 3780Sema::AssignConvertType 3781Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 3782 // Get canonical types. We're not formatting these types, just comparing 3783 // them. 3784 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 3785 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 3786 3787 if (lhsType == rhsType) 3788 return Compatible; // Common case: fast path an exact match. 3789 3790 if ((lhsType->isObjCClassType() && 3791 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) || 3792 (rhsType->isObjCClassType() && 3793 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) { 3794 return Compatible; 3795 } 3796 3797 // If the left-hand side is a reference type, then we are in a 3798 // (rare!) case where we've allowed the use of references in C, 3799 // e.g., as a parameter type in a built-in function. In this case, 3800 // just make sure that the type referenced is compatible with the 3801 // right-hand side type. The caller is responsible for adjusting 3802 // lhsType so that the resulting expression does not have reference 3803 // type. 3804 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) { 3805 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3806 return Compatible; 3807 return Incompatible; 3808 } 3809 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type 3810 // to the same ExtVector type. 3811 if (lhsType->isExtVectorType()) { 3812 if (rhsType->isExtVectorType()) 3813 return lhsType == rhsType ? Compatible : Incompatible; 3814 if (!rhsType->isVectorType() && rhsType->isArithmeticType()) 3815 return Compatible; 3816 } 3817 3818 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3819 // If we are allowing lax vector conversions, and LHS and RHS are both 3820 // vectors, the total size only needs to be the same. This is a bitcast; 3821 // no bits are changed but the result type is different. 3822 if (getLangOptions().LaxVectorConversions && 3823 lhsType->isVectorType() && rhsType->isVectorType()) { 3824 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3825 return IncompatibleVectors; 3826 } 3827 return Incompatible; 3828 } 3829 3830 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3831 return Compatible; 3832 3833 if (isa<PointerType>(lhsType)) { 3834 if (rhsType->isIntegerType()) 3835 return IntToPointer; 3836 3837 if (isa<PointerType>(rhsType)) 3838 return CheckPointerTypesForAssignment(lhsType, rhsType); 3839 3840 // In general, C pointers are not compatible with ObjC object pointers. 3841 if (isa<ObjCObjectPointerType>(rhsType)) { 3842 if (lhsType->isVoidPointerType()) // an exception to the rule. 3843 return Compatible; 3844 return IncompatiblePointer; 3845 } 3846 if (rhsType->getAs<BlockPointerType>()) { 3847 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3848 return Compatible; 3849 3850 // Treat block pointers as objects. 3851 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) 3852 return Compatible; 3853 } 3854 return Incompatible; 3855 } 3856 3857 if (isa<BlockPointerType>(lhsType)) { 3858 if (rhsType->isIntegerType()) 3859 return IntToBlockPointer; 3860 3861 // Treat block pointers as objects. 3862 if (getLangOptions().ObjC1 && rhsType->isObjCIdType()) 3863 return Compatible; 3864 3865 if (rhsType->isBlockPointerType()) 3866 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3867 3868 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3869 if (RHSPT->getPointeeType()->isVoidType()) 3870 return Compatible; 3871 } 3872 return Incompatible; 3873 } 3874 3875 if (isa<ObjCObjectPointerType>(lhsType)) { 3876 if (rhsType->isIntegerType()) 3877 return IntToPointer; 3878 3879 // In general, C pointers are not compatible with ObjC object pointers. 3880 if (isa<PointerType>(rhsType)) { 3881 if (rhsType->isVoidPointerType()) // an exception to the rule. 3882 return Compatible; 3883 return IncompatiblePointer; 3884 } 3885 if (rhsType->isObjCObjectPointerType()) { 3886 if (lhsType->isObjCBuiltinType() || rhsType->isObjCBuiltinType()) 3887 return Compatible; 3888 if (Context.typesAreCompatible(lhsType, rhsType)) 3889 return Compatible; 3890 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) 3891 return IncompatibleObjCQualifiedId; 3892 return IncompatiblePointer; 3893 } 3894 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) { 3895 if (RHSPT->getPointeeType()->isVoidType()) 3896 return Compatible; 3897 } 3898 // Treat block pointers as objects. 3899 if (rhsType->isBlockPointerType()) 3900 return Compatible; 3901 return Incompatible; 3902 } 3903 if (isa<PointerType>(rhsType)) { 3904 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3905 if (lhsType == Context.BoolTy) 3906 return Compatible; 3907 3908 if (lhsType->isIntegerType()) 3909 return PointerToInt; 3910 3911 if (isa<PointerType>(lhsType)) 3912 return CheckPointerTypesForAssignment(lhsType, rhsType); 3913 3914 if (isa<BlockPointerType>(lhsType) && 3915 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3916 return Compatible; 3917 return Incompatible; 3918 } 3919 if (isa<ObjCObjectPointerType>(rhsType)) { 3920 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3921 if (lhsType == Context.BoolTy) 3922 return Compatible; 3923 3924 if (lhsType->isIntegerType()) 3925 return PointerToInt; 3926 3927 // In general, C pointers are not compatible with ObjC object pointers. 3928 if (isa<PointerType>(lhsType)) { 3929 if (lhsType->isVoidPointerType()) // an exception to the rule. 3930 return Compatible; 3931 return IncompatiblePointer; 3932 } 3933 if (isa<BlockPointerType>(lhsType) && 3934 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) 3935 return Compatible; 3936 return Incompatible; 3937 } 3938 3939 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3940 if (Context.typesAreCompatible(lhsType, rhsType)) 3941 return Compatible; 3942 } 3943 return Incompatible; 3944} 3945 3946/// \brief Constructs a transparent union from an expression that is 3947/// used to initialize the transparent union. 3948static void ConstructTransparentUnion(ASTContext &C, Expr *&E, 3949 QualType UnionType, FieldDecl *Field) { 3950 // Build an initializer list that designates the appropriate member 3951 // of the transparent union. 3952 InitListExpr *Initializer = new (C) InitListExpr(SourceLocation(), 3953 &E, 1, 3954 SourceLocation()); 3955 Initializer->setType(UnionType); 3956 Initializer->setInitializedFieldInUnion(Field); 3957 3958 // Build a compound literal constructing a value of the transparent 3959 // union type from this initializer list. 3960 E = new (C) CompoundLiteralExpr(SourceLocation(), UnionType, Initializer, 3961 false); 3962} 3963 3964Sema::AssignConvertType 3965Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) { 3966 QualType FromType = rExpr->getType(); 3967 3968 // If the ArgType is a Union type, we want to handle a potential 3969 // transparent_union GCC extension. 3970 const RecordType *UT = ArgType->getAsUnionType(); 3971 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) 3972 return Incompatible; 3973 3974 // The field to initialize within the transparent union. 3975 RecordDecl *UD = UT->getDecl(); 3976 FieldDecl *InitField = 0; 3977 // It's compatible if the expression matches any of the fields. 3978 for (RecordDecl::field_iterator it = UD->field_begin(), 3979 itend = UD->field_end(); 3980 it != itend; ++it) { 3981 if (it->getType()->isPointerType()) { 3982 // If the transparent union contains a pointer type, we allow: 3983 // 1) void pointer 3984 // 2) null pointer constant 3985 if (FromType->isPointerType()) 3986 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 3987 ImpCastExprToType(rExpr, it->getType(), CastExpr::CK_BitCast); 3988 InitField = *it; 3989 break; 3990 } 3991 3992 if (rExpr->isNullPointerConstant(Context, 3993 Expr::NPC_ValueDependentIsNull)) { 3994 ImpCastExprToType(rExpr, it->getType(), CastExpr::CK_IntegralToPointer); 3995 InitField = *it; 3996 break; 3997 } 3998 } 3999 4000 if (CheckAssignmentConstraints(it->getType(), rExpr->getType()) 4001 == Compatible) { 4002 InitField = *it; 4003 break; 4004 } 4005 } 4006 4007 if (!InitField) 4008 return Incompatible; 4009 4010 ConstructTransparentUnion(Context, rExpr, ArgType, InitField); 4011 return Compatible; 4012} 4013 4014Sema::AssignConvertType 4015Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 4016 if (getLangOptions().CPlusPlus) { 4017 if (!lhsType->isRecordType()) { 4018 // C++ 5.17p3: If the left operand is not of class type, the 4019 // expression is implicitly converted (C++ 4) to the 4020 // cv-unqualified type of the left operand. 4021 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 4022 "assigning")) 4023 return Incompatible; 4024 return Compatible; 4025 } 4026 4027 // FIXME: Currently, we fall through and treat C++ classes like C 4028 // structures. 4029 } 4030 4031 // C99 6.5.16.1p1: the left operand is a pointer and the right is 4032 // a null pointer constant. 4033 if ((lhsType->isPointerType() || 4034 lhsType->isObjCObjectPointerType() || 4035 lhsType->isBlockPointerType()) 4036 && rExpr->isNullPointerConstant(Context, 4037 Expr::NPC_ValueDependentIsNull)) { 4038 ImpCastExprToType(rExpr, lhsType, CastExpr::CK_Unknown); 4039 return Compatible; 4040 } 4041 4042 // This check seems unnatural, however it is necessary to ensure the proper 4043 // conversion of functions/arrays. If the conversion were done for all 4044 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary 4045 // expressions that surpress this implicit conversion (&, sizeof). 4046 // 4047 // Suppress this for references: C++ 8.5.3p5. 4048 if (!lhsType->isReferenceType()) 4049 DefaultFunctionArrayConversion(rExpr); 4050 4051 Sema::AssignConvertType result = 4052 CheckAssignmentConstraints(lhsType, rExpr->getType()); 4053 4054 // C99 6.5.16.1p2: The value of the right operand is converted to the 4055 // type of the assignment expression. 4056 // CheckAssignmentConstraints allows the left-hand side to be a reference, 4057 // so that we can use references in built-in functions even in C. 4058 // The getNonReferenceType() call makes sure that the resulting expression 4059 // does not have reference type. 4060 if (result != Incompatible && rExpr->getType() != lhsType) 4061 ImpCastExprToType(rExpr, lhsType.getNonReferenceType(), 4062 CastExpr::CK_Unknown); 4063 return result; 4064} 4065 4066QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 4067 Diag(Loc, diag::err_typecheck_invalid_operands) 4068 << lex->getType() << rex->getType() 4069 << lex->getSourceRange() << rex->getSourceRange(); 4070 return QualType(); 4071} 4072 4073inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 4074 Expr *&rex) { 4075 // For conversion purposes, we ignore any qualifiers. 4076 // For example, "const float" and "float" are equivalent. 4077 QualType lhsType = 4078 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 4079 QualType rhsType = 4080 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 4081 4082 // If the vector types are identical, return. 4083 if (lhsType == rhsType) 4084 return lhsType; 4085 4086 // Handle the case of a vector & extvector type of the same size and element 4087 // type. It would be nice if we only had one vector type someday. 4088 if (getLangOptions().LaxVectorConversions) { 4089 // FIXME: Should we warn here? 4090 if (const VectorType *LV = lhsType->getAs<VectorType>()) { 4091 if (const VectorType *RV = rhsType->getAs<VectorType>()) 4092 if (LV->getElementType() == RV->getElementType() && 4093 LV->getNumElements() == RV->getNumElements()) { 4094 return lhsType->isExtVectorType() ? lhsType : rhsType; 4095 } 4096 } 4097 } 4098 4099 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can 4100 // swap back (so that we don't reverse the inputs to a subtract, for instance. 4101 bool swapped = false; 4102 if (rhsType->isExtVectorType()) { 4103 swapped = true; 4104 std::swap(rex, lex); 4105 std::swap(rhsType, lhsType); 4106 } 4107 4108 // Handle the case of an ext vector and scalar. 4109 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) { 4110 QualType EltTy = LV->getElementType(); 4111 if (EltTy->isIntegralType() && rhsType->isIntegralType()) { 4112 if (Context.getIntegerTypeOrder(EltTy, rhsType) >= 0) { 4113 ImpCastExprToType(rex, lhsType, CastExpr::CK_IntegralCast); 4114 if (swapped) std::swap(rex, lex); 4115 return lhsType; 4116 } 4117 } 4118 if (EltTy->isRealFloatingType() && rhsType->isScalarType() && 4119 rhsType->isRealFloatingType()) { 4120 if (Context.getFloatingTypeOrder(EltTy, rhsType) >= 0) { 4121 ImpCastExprToType(rex, lhsType, CastExpr::CK_FloatingCast); 4122 if (swapped) std::swap(rex, lex); 4123 return lhsType; 4124 } 4125 } 4126 } 4127 4128 // Vectors of different size or scalar and non-ext-vector are errors. 4129 Diag(Loc, diag::err_typecheck_vector_not_convertable) 4130 << lex->getType() << rex->getType() 4131 << lex->getSourceRange() << rex->getSourceRange(); 4132 return QualType(); 4133} 4134 4135inline QualType Sema::CheckMultiplyDivideOperands( 4136 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4137 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4138 return CheckVectorOperands(Loc, lex, rex); 4139 4140 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4141 4142 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4143 return compType; 4144 return InvalidOperands(Loc, lex, rex); 4145} 4146 4147inline QualType Sema::CheckRemainderOperands( 4148 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4149 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4150 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4151 return CheckVectorOperands(Loc, lex, rex); 4152 return InvalidOperands(Loc, lex, rex); 4153 } 4154 4155 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4156 4157 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4158 return compType; 4159 return InvalidOperands(Loc, lex, rex); 4160} 4161 4162inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 4163 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) { 4164 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4165 QualType compType = CheckVectorOperands(Loc, lex, rex); 4166 if (CompLHSTy) *CompLHSTy = compType; 4167 return compType; 4168 } 4169 4170 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4171 4172 // handle the common case first (both operands are arithmetic). 4173 if (lex->getType()->isArithmeticType() && 4174 rex->getType()->isArithmeticType()) { 4175 if (CompLHSTy) *CompLHSTy = compType; 4176 return compType; 4177 } 4178 4179 // Put any potential pointer into PExp 4180 Expr* PExp = lex, *IExp = rex; 4181 if (IExp->getType()->isAnyPointerType()) 4182 std::swap(PExp, IExp); 4183 4184 if (PExp->getType()->isAnyPointerType()) { 4185 4186 if (IExp->getType()->isIntegerType()) { 4187 QualType PointeeTy = PExp->getType()->getPointeeType(); 4188 4189 // Check for arithmetic on pointers to incomplete types. 4190 if (PointeeTy->isVoidType()) { 4191 if (getLangOptions().CPlusPlus) { 4192 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4193 << lex->getSourceRange() << rex->getSourceRange(); 4194 return QualType(); 4195 } 4196 4197 // GNU extension: arithmetic on pointer to void 4198 Diag(Loc, diag::ext_gnu_void_ptr) 4199 << lex->getSourceRange() << rex->getSourceRange(); 4200 } else if (PointeeTy->isFunctionType()) { 4201 if (getLangOptions().CPlusPlus) { 4202 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4203 << lex->getType() << lex->getSourceRange(); 4204 return QualType(); 4205 } 4206 4207 // GNU extension: arithmetic on pointer to function 4208 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4209 << lex->getType() << lex->getSourceRange(); 4210 } else { 4211 // Check if we require a complete type. 4212 if (((PExp->getType()->isPointerType() && 4213 !PExp->getType()->isDependentType()) || 4214 PExp->getType()->isObjCObjectPointerType()) && 4215 RequireCompleteType(Loc, PointeeTy, 4216 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 4217 << PExp->getSourceRange() 4218 << PExp->getType())) 4219 return QualType(); 4220 } 4221 // Diagnose bad cases where we step over interface counts. 4222 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4223 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4224 << PointeeTy << PExp->getSourceRange(); 4225 return QualType(); 4226 } 4227 4228 if (CompLHSTy) { 4229 QualType LHSTy = Context.isPromotableBitField(lex); 4230 if (LHSTy.isNull()) { 4231 LHSTy = lex->getType(); 4232 if (LHSTy->isPromotableIntegerType()) 4233 LHSTy = Context.getPromotedIntegerType(LHSTy); 4234 } 4235 *CompLHSTy = LHSTy; 4236 } 4237 return PExp->getType(); 4238 } 4239 } 4240 4241 return InvalidOperands(Loc, lex, rex); 4242} 4243 4244// C99 6.5.6 4245QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 4246 SourceLocation Loc, QualType* CompLHSTy) { 4247 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 4248 QualType compType = CheckVectorOperands(Loc, lex, rex); 4249 if (CompLHSTy) *CompLHSTy = compType; 4250 return compType; 4251 } 4252 4253 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 4254 4255 // Enforce type constraints: C99 6.5.6p3. 4256 4257 // Handle the common case first (both operands are arithmetic). 4258 if (lex->getType()->isArithmeticType() 4259 && rex->getType()->isArithmeticType()) { 4260 if (CompLHSTy) *CompLHSTy = compType; 4261 return compType; 4262 } 4263 4264 // Either ptr - int or ptr - ptr. 4265 if (lex->getType()->isAnyPointerType()) { 4266 QualType lpointee = lex->getType()->getPointeeType(); 4267 4268 // The LHS must be an completely-defined object type. 4269 4270 bool ComplainAboutVoid = false; 4271 Expr *ComplainAboutFunc = 0; 4272 if (lpointee->isVoidType()) { 4273 if (getLangOptions().CPlusPlus) { 4274 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4275 << lex->getSourceRange() << rex->getSourceRange(); 4276 return QualType(); 4277 } 4278 4279 // GNU C extension: arithmetic on pointer to void 4280 ComplainAboutVoid = true; 4281 } else if (lpointee->isFunctionType()) { 4282 if (getLangOptions().CPlusPlus) { 4283 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4284 << lex->getType() << lex->getSourceRange(); 4285 return QualType(); 4286 } 4287 4288 // GNU C extension: arithmetic on pointer to function 4289 ComplainAboutFunc = lex; 4290 } else if (!lpointee->isDependentType() && 4291 RequireCompleteType(Loc, lpointee, 4292 PDiag(diag::err_typecheck_sub_ptr_object) 4293 << lex->getSourceRange() 4294 << lex->getType())) 4295 return QualType(); 4296 4297 // Diagnose bad cases where we step over interface counts. 4298 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 4299 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 4300 << lpointee << lex->getSourceRange(); 4301 return QualType(); 4302 } 4303 4304 // The result type of a pointer-int computation is the pointer type. 4305 if (rex->getType()->isIntegerType()) { 4306 if (ComplainAboutVoid) 4307 Diag(Loc, diag::ext_gnu_void_ptr) 4308 << lex->getSourceRange() << rex->getSourceRange(); 4309 if (ComplainAboutFunc) 4310 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4311 << ComplainAboutFunc->getType() 4312 << ComplainAboutFunc->getSourceRange(); 4313 4314 if (CompLHSTy) *CompLHSTy = lex->getType(); 4315 return lex->getType(); 4316 } 4317 4318 // Handle pointer-pointer subtractions. 4319 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) { 4320 QualType rpointee = RHSPTy->getPointeeType(); 4321 4322 // RHS must be a completely-type object type. 4323 // Handle the GNU void* extension. 4324 if (rpointee->isVoidType()) { 4325 if (getLangOptions().CPlusPlus) { 4326 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 4327 << lex->getSourceRange() << rex->getSourceRange(); 4328 return QualType(); 4329 } 4330 4331 ComplainAboutVoid = true; 4332 } else if (rpointee->isFunctionType()) { 4333 if (getLangOptions().CPlusPlus) { 4334 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 4335 << rex->getType() << rex->getSourceRange(); 4336 return QualType(); 4337 } 4338 4339 // GNU extension: arithmetic on pointer to function 4340 if (!ComplainAboutFunc) 4341 ComplainAboutFunc = rex; 4342 } else if (!rpointee->isDependentType() && 4343 RequireCompleteType(Loc, rpointee, 4344 PDiag(diag::err_typecheck_sub_ptr_object) 4345 << rex->getSourceRange() 4346 << rex->getType())) 4347 return QualType(); 4348 4349 if (getLangOptions().CPlusPlus) { 4350 // Pointee types must be the same: C++ [expr.add] 4351 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) { 4352 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4353 << lex->getType() << rex->getType() 4354 << lex->getSourceRange() << rex->getSourceRange(); 4355 return QualType(); 4356 } 4357 } else { 4358 // Pointee types must be compatible C99 6.5.6p3 4359 if (!Context.typesAreCompatible( 4360 Context.getCanonicalType(lpointee).getUnqualifiedType(), 4361 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 4362 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 4363 << lex->getType() << rex->getType() 4364 << lex->getSourceRange() << rex->getSourceRange(); 4365 return QualType(); 4366 } 4367 } 4368 4369 if (ComplainAboutVoid) 4370 Diag(Loc, diag::ext_gnu_void_ptr) 4371 << lex->getSourceRange() << rex->getSourceRange(); 4372 if (ComplainAboutFunc) 4373 Diag(Loc, diag::ext_gnu_ptr_func_arith) 4374 << ComplainAboutFunc->getType() 4375 << ComplainAboutFunc->getSourceRange(); 4376 4377 if (CompLHSTy) *CompLHSTy = lex->getType(); 4378 return Context.getPointerDiffType(); 4379 } 4380 } 4381 4382 return InvalidOperands(Loc, lex, rex); 4383} 4384 4385// C99 6.5.7 4386QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4387 bool isCompAssign) { 4388 // C99 6.5.7p2: Each of the operands shall have integer type. 4389 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 4390 return InvalidOperands(Loc, lex, rex); 4391 4392 // Vector shifts promote their scalar inputs to vector type. 4393 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4394 return CheckVectorOperands(Loc, lex, rex); 4395 4396 // Shifts don't perform usual arithmetic conversions, they just do integer 4397 // promotions on each operand. C99 6.5.7p3 4398 QualType LHSTy = Context.isPromotableBitField(lex); 4399 if (LHSTy.isNull()) { 4400 LHSTy = lex->getType(); 4401 if (LHSTy->isPromotableIntegerType()) 4402 LHSTy = Context.getPromotedIntegerType(LHSTy); 4403 } 4404 if (!isCompAssign) 4405 ImpCastExprToType(lex, LHSTy, CastExpr::CK_IntegralCast); 4406 4407 UsualUnaryConversions(rex); 4408 4409 // Sanity-check shift operands 4410 llvm::APSInt Right; 4411 // Check right/shifter operand 4412 if (!rex->isValueDependent() && 4413 rex->isIntegerConstantExpr(Right, Context)) { 4414 if (Right.isNegative()) 4415 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange(); 4416 else { 4417 llvm::APInt LeftBits(Right.getBitWidth(), 4418 Context.getTypeSize(lex->getType())); 4419 if (Right.uge(LeftBits)) 4420 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange(); 4421 } 4422 } 4423 4424 // "The type of the result is that of the promoted left operand." 4425 return LHSTy; 4426} 4427 4428// C99 6.5.8, C++ [expr.rel] 4429QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 4430 unsigned OpaqueOpc, bool isRelational) { 4431 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 4432 4433 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4434 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 4435 4436 // C99 6.5.8p3 / C99 6.5.9p4 4437 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 4438 UsualArithmeticConversions(lex, rex); 4439 else { 4440 UsualUnaryConversions(lex); 4441 UsualUnaryConversions(rex); 4442 } 4443 QualType lType = lex->getType(); 4444 QualType rType = rex->getType(); 4445 4446 if (!lType->isFloatingType() 4447 && !(lType->isBlockPointerType() && isRelational)) { 4448 // For non-floating point types, check for self-comparisons of the form 4449 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4450 // often indicate logic errors in the program. 4451 // NOTE: Don't warn about comparisons of enum constants. These can arise 4452 // from macro expansions, and are usually quite deliberate. 4453 Expr *LHSStripped = lex->IgnoreParens(); 4454 Expr *RHSStripped = rex->IgnoreParens(); 4455 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 4456 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 4457 if (DRL->getDecl() == DRR->getDecl() && 4458 !isa<EnumConstantDecl>(DRL->getDecl())) 4459 Diag(Loc, diag::warn_selfcomparison); 4460 4461 if (isa<CastExpr>(LHSStripped)) 4462 LHSStripped = LHSStripped->IgnoreParenCasts(); 4463 if (isa<CastExpr>(RHSStripped)) 4464 RHSStripped = RHSStripped->IgnoreParenCasts(); 4465 4466 // Warn about comparisons against a string constant (unless the other 4467 // operand is null), the user probably wants strcmp. 4468 Expr *literalString = 0; 4469 Expr *literalStringStripped = 0; 4470 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 4471 !RHSStripped->isNullPointerConstant(Context, 4472 Expr::NPC_ValueDependentIsNull)) { 4473 literalString = lex; 4474 literalStringStripped = LHSStripped; 4475 } else if ((isa<StringLiteral>(RHSStripped) || 4476 isa<ObjCEncodeExpr>(RHSStripped)) && 4477 !LHSStripped->isNullPointerConstant(Context, 4478 Expr::NPC_ValueDependentIsNull)) { 4479 literalString = rex; 4480 literalStringStripped = RHSStripped; 4481 } 4482 4483 if (literalString) { 4484 std::string resultComparison; 4485 switch (Opc) { 4486 case BinaryOperator::LT: resultComparison = ") < 0"; break; 4487 case BinaryOperator::GT: resultComparison = ") > 0"; break; 4488 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 4489 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 4490 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 4491 case BinaryOperator::NE: resultComparison = ") != 0"; break; 4492 default: assert(false && "Invalid comparison operator"); 4493 } 4494 Diag(Loc, diag::warn_stringcompare) 4495 << isa<ObjCEncodeExpr>(literalStringStripped) 4496 << literalString->getSourceRange() 4497 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 4498 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 4499 "strcmp(") 4500 << CodeModificationHint::CreateInsertion( 4501 PP.getLocForEndOfToken(rex->getLocEnd()), 4502 resultComparison); 4503 } 4504 } 4505 4506 // The result of comparisons is 'bool' in C++, 'int' in C. 4507 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 4508 4509 if (isRelational) { 4510 if (lType->isRealType() && rType->isRealType()) 4511 return ResultTy; 4512 } else { 4513 // Check for comparisons of floating point operands using != and ==. 4514 if (lType->isFloatingType()) { 4515 assert(rType->isFloatingType()); 4516 CheckFloatComparison(Loc,lex,rex); 4517 } 4518 4519 if (lType->isArithmeticType() && rType->isArithmeticType()) 4520 return ResultTy; 4521 } 4522 4523 bool LHSIsNull = lex->isNullPointerConstant(Context, 4524 Expr::NPC_ValueDependentIsNull); 4525 bool RHSIsNull = rex->isNullPointerConstant(Context, 4526 Expr::NPC_ValueDependentIsNull); 4527 4528 // All of the following pointer related warnings are GCC extensions, except 4529 // when handling null pointer constants. One day, we can consider making them 4530 // errors (when -pedantic-errors is enabled). 4531 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 4532 QualType LCanPointeeTy = 4533 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType()); 4534 QualType RCanPointeeTy = 4535 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType()); 4536 4537 if (getLangOptions().CPlusPlus) { 4538 if (LCanPointeeTy == RCanPointeeTy) 4539 return ResultTy; 4540 4541 // C++ [expr.rel]p2: 4542 // [...] Pointer conversions (4.10) and qualification 4543 // conversions (4.4) are performed on pointer operands (or on 4544 // a pointer operand and a null pointer constant) to bring 4545 // them to their composite pointer type. [...] 4546 // 4547 // C++ [expr.eq]p1 uses the same notion for (in)equality 4548 // comparisons of pointers. 4549 QualType T = FindCompositePointerType(lex, rex); 4550 if (T.isNull()) { 4551 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4552 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4553 return QualType(); 4554 } 4555 4556 ImpCastExprToType(lex, T, CastExpr::CK_BitCast); 4557 ImpCastExprToType(rex, T, CastExpr::CK_BitCast); 4558 return ResultTy; 4559 } 4560 // C99 6.5.9p2 and C99 6.5.8p2 4561 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 4562 RCanPointeeTy.getUnqualifiedType())) { 4563 // Valid unless a relational comparison of function pointers 4564 if (isRelational && LCanPointeeTy->isFunctionType()) { 4565 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers) 4566 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4567 } 4568 } else if (!isRelational && 4569 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) { 4570 // Valid unless comparison between non-null pointer and function pointer 4571 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType()) 4572 && !LHSIsNull && !RHSIsNull) { 4573 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void) 4574 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4575 } 4576 } else { 4577 // Invalid 4578 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4579 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4580 } 4581 if (LCanPointeeTy != RCanPointeeTy) 4582 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4583 return ResultTy; 4584 } 4585 4586 if (getLangOptions().CPlusPlus) { 4587 // Comparison of pointers with null pointer constants and equality 4588 // comparisons of member pointers to null pointer constants. 4589 if (RHSIsNull && 4590 (lType->isPointerType() || 4591 (!isRelational && lType->isMemberPointerType()))) { 4592 ImpCastExprToType(rex, lType, CastExpr::CK_NullToMemberPointer); 4593 return ResultTy; 4594 } 4595 if (LHSIsNull && 4596 (rType->isPointerType() || 4597 (!isRelational && rType->isMemberPointerType()))) { 4598 ImpCastExprToType(lex, rType, CastExpr::CK_NullToMemberPointer); 4599 return ResultTy; 4600 } 4601 4602 // Comparison of member pointers. 4603 if (!isRelational && 4604 lType->isMemberPointerType() && rType->isMemberPointerType()) { 4605 // C++ [expr.eq]p2: 4606 // In addition, pointers to members can be compared, or a pointer to 4607 // member and a null pointer constant. Pointer to member conversions 4608 // (4.11) and qualification conversions (4.4) are performed to bring 4609 // them to a common type. If one operand is a null pointer constant, 4610 // the common type is the type of the other operand. Otherwise, the 4611 // common type is a pointer to member type similar (4.4) to the type 4612 // of one of the operands, with a cv-qualification signature (4.4) 4613 // that is the union of the cv-qualification signatures of the operand 4614 // types. 4615 QualType T = FindCompositePointerType(lex, rex); 4616 if (T.isNull()) { 4617 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers) 4618 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4619 return QualType(); 4620 } 4621 4622 ImpCastExprToType(lex, T, CastExpr::CK_BitCast); 4623 ImpCastExprToType(rex, T, CastExpr::CK_BitCast); 4624 return ResultTy; 4625 } 4626 4627 // Comparison of nullptr_t with itself. 4628 if (lType->isNullPtrType() && rType->isNullPtrType()) 4629 return ResultTy; 4630 } 4631 4632 // Handle block pointer types. 4633 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) { 4634 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType(); 4635 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType(); 4636 4637 if (!LHSIsNull && !RHSIsNull && 4638 !Context.typesAreCompatible(lpointee, rpointee)) { 4639 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4640 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4641 } 4642 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4643 return ResultTy; 4644 } 4645 // Allow block pointers to be compared with null pointer constants. 4646 if (!isRelational 4647 && ((lType->isBlockPointerType() && rType->isPointerType()) 4648 || (lType->isPointerType() && rType->isBlockPointerType()))) { 4649 if (!LHSIsNull && !RHSIsNull) { 4650 if (!((rType->isPointerType() && rType->getAs<PointerType>() 4651 ->getPointeeType()->isVoidType()) 4652 || (lType->isPointerType() && lType->getAs<PointerType>() 4653 ->getPointeeType()->isVoidType()))) 4654 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 4655 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4656 } 4657 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4658 return ResultTy; 4659 } 4660 4661 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) { 4662 if (lType->isPointerType() || rType->isPointerType()) { 4663 const PointerType *LPT = lType->getAs<PointerType>(); 4664 const PointerType *RPT = rType->getAs<PointerType>(); 4665 bool LPtrToVoid = LPT ? 4666 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 4667 bool RPtrToVoid = RPT ? 4668 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 4669 4670 if (!LPtrToVoid && !RPtrToVoid && 4671 !Context.typesAreCompatible(lType, rType)) { 4672 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4673 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4674 } 4675 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4676 return ResultTy; 4677 } 4678 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) { 4679 if (!Context.areComparableObjCPointerTypes(lType, rType)) 4680 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 4681 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4682 ImpCastExprToType(rex, lType, CastExpr::CK_BitCast); 4683 return ResultTy; 4684 } 4685 } 4686 if (lType->isAnyPointerType() && rType->isIntegerType()) { 4687 unsigned DiagID = 0; 4688 if (RHSIsNull) { 4689 if (isRelational) 4690 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4691 } else if (isRelational) 4692 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4693 else 4694 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4695 4696 if (DiagID) { 4697 Diag(Loc, DiagID) 4698 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4699 } 4700 ImpCastExprToType(rex, lType, CastExpr::CK_IntegralToPointer); 4701 return ResultTy; 4702 } 4703 if (lType->isIntegerType() && rType->isAnyPointerType()) { 4704 unsigned DiagID = 0; 4705 if (LHSIsNull) { 4706 if (isRelational) 4707 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero; 4708 } else if (isRelational) 4709 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer; 4710 else 4711 DiagID = diag::ext_typecheck_comparison_of_pointer_integer; 4712 4713 if (DiagID) { 4714 Diag(Loc, DiagID) 4715 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 4716 } 4717 ImpCastExprToType(lex, rType, CastExpr::CK_IntegralToPointer); 4718 return ResultTy; 4719 } 4720 // Handle block pointers. 4721 if (!isRelational && RHSIsNull 4722 && lType->isBlockPointerType() && rType->isIntegerType()) { 4723 ImpCastExprToType(rex, lType, CastExpr::CK_IntegralToPointer); 4724 return ResultTy; 4725 } 4726 if (!isRelational && LHSIsNull 4727 && lType->isIntegerType() && rType->isBlockPointerType()) { 4728 ImpCastExprToType(lex, rType, CastExpr::CK_IntegralToPointer); 4729 return ResultTy; 4730 } 4731 return InvalidOperands(Loc, lex, rex); 4732} 4733 4734/// CheckVectorCompareOperands - vector comparisons are a clang extension that 4735/// operates on extended vector types. Instead of producing an IntTy result, 4736/// like a scalar comparison, a vector comparison produces a vector of integer 4737/// types. 4738QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 4739 SourceLocation Loc, 4740 bool isRelational) { 4741 // Check to make sure we're operating on vectors of the same type and width, 4742 // Allowing one side to be a scalar of element type. 4743 QualType vType = CheckVectorOperands(Loc, lex, rex); 4744 if (vType.isNull()) 4745 return vType; 4746 4747 QualType lType = lex->getType(); 4748 QualType rType = rex->getType(); 4749 4750 // For non-floating point types, check for self-comparisons of the form 4751 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 4752 // often indicate logic errors in the program. 4753 if (!lType->isFloatingType()) { 4754 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 4755 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 4756 if (DRL->getDecl() == DRR->getDecl()) 4757 Diag(Loc, diag::warn_selfcomparison); 4758 } 4759 4760 // Check for comparisons of floating point operands using != and ==. 4761 if (!isRelational && lType->isFloatingType()) { 4762 assert (rType->isFloatingType()); 4763 CheckFloatComparison(Loc,lex,rex); 4764 } 4765 4766 // Return the type for the comparison, which is the same as vector type for 4767 // integer vectors, or an integer type of identical size and number of 4768 // elements for floating point vectors. 4769 if (lType->isIntegerType()) 4770 return lType; 4771 4772 const VectorType *VTy = lType->getAs<VectorType>(); 4773 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 4774 if (TypeSize == Context.getTypeSize(Context.IntTy)) 4775 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 4776 if (TypeSize == Context.getTypeSize(Context.LongTy)) 4777 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 4778 4779 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 4780 "Unhandled vector element size in vector compare"); 4781 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 4782} 4783 4784inline QualType Sema::CheckBitwiseOperands( 4785 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) { 4786 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 4787 return CheckVectorOperands(Loc, lex, rex); 4788 4789 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 4790 4791 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 4792 return compType; 4793 return InvalidOperands(Loc, lex, rex); 4794} 4795 4796inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 4797 Expr *&lex, Expr *&rex, SourceLocation Loc) { 4798 UsualUnaryConversions(lex); 4799 UsualUnaryConversions(rex); 4800 4801 if (!lex->getType()->isScalarType() || !rex->getType()->isScalarType()) 4802 return InvalidOperands(Loc, lex, rex); 4803 4804 if (Context.getLangOptions().CPlusPlus) { 4805 // C++ [expr.log.and]p2 4806 // C++ [expr.log.or]p2 4807 return Context.BoolTy; 4808 } 4809 4810 return Context.IntTy; 4811} 4812 4813/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 4814/// is a read-only property; return true if so. A readonly property expression 4815/// depends on various declarations and thus must be treated specially. 4816/// 4817static bool IsReadonlyProperty(Expr *E, Sema &S) { 4818 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 4819 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 4820 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 4821 QualType BaseType = PropExpr->getBase()->getType(); 4822 if (const ObjCObjectPointerType *OPT = 4823 BaseType->getAsObjCInterfacePointerType()) 4824 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl()) 4825 if (S.isPropertyReadonly(PDecl, IFace)) 4826 return true; 4827 } 4828 } 4829 return false; 4830} 4831 4832/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 4833/// emit an error and return true. If so, return false. 4834static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 4835 SourceLocation OrigLoc = Loc; 4836 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 4837 &Loc); 4838 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 4839 IsLV = Expr::MLV_ReadonlyProperty; 4840 if (IsLV == Expr::MLV_Valid) 4841 return false; 4842 4843 unsigned Diag = 0; 4844 bool NeedType = false; 4845 switch (IsLV) { // C99 6.5.16p2 4846 default: assert(0 && "Unknown result from isModifiableLvalue!"); 4847 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 4848 case Expr::MLV_ArrayType: 4849 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 4850 NeedType = true; 4851 break; 4852 case Expr::MLV_NotObjectType: 4853 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 4854 NeedType = true; 4855 break; 4856 case Expr::MLV_LValueCast: 4857 Diag = diag::err_typecheck_lvalue_casts_not_supported; 4858 break; 4859 case Expr::MLV_InvalidExpression: 4860 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 4861 break; 4862 case Expr::MLV_IncompleteType: 4863 case Expr::MLV_IncompleteVoidType: 4864 return S.RequireCompleteType(Loc, E->getType(), 4865 PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue) 4866 << E->getSourceRange()); 4867 case Expr::MLV_DuplicateVectorComponents: 4868 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 4869 break; 4870 case Expr::MLV_NotBlockQualified: 4871 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 4872 break; 4873 case Expr::MLV_ReadonlyProperty: 4874 Diag = diag::error_readonly_property_assignment; 4875 break; 4876 case Expr::MLV_NoSetterProperty: 4877 Diag = diag::error_nosetter_property_assignment; 4878 break; 4879 } 4880 4881 SourceRange Assign; 4882 if (Loc != OrigLoc) 4883 Assign = SourceRange(OrigLoc, OrigLoc); 4884 if (NeedType) 4885 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 4886 else 4887 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 4888 return true; 4889} 4890 4891 4892 4893// C99 6.5.16.1 4894QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 4895 SourceLocation Loc, 4896 QualType CompoundType) { 4897 // Verify that LHS is a modifiable lvalue, and emit error if not. 4898 if (CheckForModifiableLvalue(LHS, Loc, *this)) 4899 return QualType(); 4900 4901 QualType LHSType = LHS->getType(); 4902 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 4903 4904 AssignConvertType ConvTy; 4905 if (CompoundType.isNull()) { 4906 // Simple assignment "x = y". 4907 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 4908 // Special case of NSObject attributes on c-style pointer types. 4909 if (ConvTy == IncompatiblePointer && 4910 ((Context.isObjCNSObjectType(LHSType) && 4911 RHSType->isObjCObjectPointerType()) || 4912 (Context.isObjCNSObjectType(RHSType) && 4913 LHSType->isObjCObjectPointerType()))) 4914 ConvTy = Compatible; 4915 4916 // If the RHS is a unary plus or minus, check to see if they = and + are 4917 // right next to each other. If so, the user may have typo'd "x =+ 4" 4918 // instead of "x += 4". 4919 Expr *RHSCheck = RHS; 4920 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 4921 RHSCheck = ICE->getSubExpr(); 4922 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 4923 if ((UO->getOpcode() == UnaryOperator::Plus || 4924 UO->getOpcode() == UnaryOperator::Minus) && 4925 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 4926 // Only if the two operators are exactly adjacent. 4927 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 4928 // And there is a space or other character before the subexpr of the 4929 // unary +/-. We don't want to warn on "x=-1". 4930 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 4931 UO->getSubExpr()->getLocStart().isFileID()) { 4932 Diag(Loc, diag::warn_not_compound_assign) 4933 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 4934 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 4935 } 4936 } 4937 } else { 4938 // Compound assignment "x += y" 4939 ConvTy = CheckAssignmentConstraints(LHSType, RHSType); 4940 } 4941 4942 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 4943 RHS, "assigning")) 4944 return QualType(); 4945 4946 // C99 6.5.16p3: The type of an assignment expression is the type of the 4947 // left operand unless the left operand has qualified type, in which case 4948 // it is the unqualified version of the type of the left operand. 4949 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 4950 // is converted to the type of the assignment expression (above). 4951 // C++ 5.17p1: the type of the assignment expression is that of its left 4952 // operand. 4953 return LHSType.getUnqualifiedType(); 4954} 4955 4956// C99 6.5.17 4957QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 4958 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 4959 DefaultFunctionArrayConversion(RHS); 4960 4961 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 4962 // incomplete in C++). 4963 4964 return RHS->getType(); 4965} 4966 4967/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 4968/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 4969QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 4970 bool isInc) { 4971 if (Op->isTypeDependent()) 4972 return Context.DependentTy; 4973 4974 QualType ResType = Op->getType(); 4975 assert(!ResType.isNull() && "no type for increment/decrement expression"); 4976 4977 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 4978 // Decrement of bool is not allowed. 4979 if (!isInc) { 4980 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 4981 return QualType(); 4982 } 4983 // Increment of bool sets it to true, but is deprecated. 4984 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 4985 } else if (ResType->isRealType()) { 4986 // OK! 4987 } else if (ResType->isAnyPointerType()) { 4988 QualType PointeeTy = ResType->getPointeeType(); 4989 4990 // C99 6.5.2.4p2, 6.5.6p2 4991 if (PointeeTy->isVoidType()) { 4992 if (getLangOptions().CPlusPlus) { 4993 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 4994 << Op->getSourceRange(); 4995 return QualType(); 4996 } 4997 4998 // Pointer to void is a GNU extension in C. 4999 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 5000 } else if (PointeeTy->isFunctionType()) { 5001 if (getLangOptions().CPlusPlus) { 5002 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 5003 << Op->getType() << Op->getSourceRange(); 5004 return QualType(); 5005 } 5006 5007 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 5008 << ResType << Op->getSourceRange(); 5009 } else if (RequireCompleteType(OpLoc, PointeeTy, 5010 PDiag(diag::err_typecheck_arithmetic_incomplete_type) 5011 << Op->getSourceRange() 5012 << ResType)) 5013 return QualType(); 5014 // Diagnose bad cases where we step over interface counts. 5015 else if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 5016 Diag(OpLoc, diag::err_arithmetic_nonfragile_interface) 5017 << PointeeTy << Op->getSourceRange(); 5018 return QualType(); 5019 } 5020 } else if (ResType->isComplexType()) { 5021 // C99 does not support ++/-- on complex types, we allow as an extension. 5022 Diag(OpLoc, diag::ext_integer_increment_complex) 5023 << ResType << Op->getSourceRange(); 5024 } else { 5025 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 5026 << ResType << Op->getSourceRange(); 5027 return QualType(); 5028 } 5029 // At this point, we know we have a real, complex or pointer type. 5030 // Now make sure the operand is a modifiable lvalue. 5031 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 5032 return QualType(); 5033 return ResType; 5034} 5035 5036/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 5037/// This routine allows us to typecheck complex/recursive expressions 5038/// where the declaration is needed for type checking. We only need to 5039/// handle cases when the expression references a function designator 5040/// or is an lvalue. Here are some examples: 5041/// - &(x) => x 5042/// - &*****f => f for f a function designator. 5043/// - &s.xx => s 5044/// - &s.zz[1].yy -> s, if zz is an array 5045/// - *(x + 1) -> x, if x is an array 5046/// - &"123"[2] -> 0 5047/// - & __real__ x -> x 5048static NamedDecl *getPrimaryDecl(Expr *E) { 5049 switch (E->getStmtClass()) { 5050 case Stmt::DeclRefExprClass: 5051 return cast<DeclRefExpr>(E)->getDecl(); 5052 case Stmt::MemberExprClass: 5053 // If this is an arrow operator, the address is an offset from 5054 // the base's value, so the object the base refers to is 5055 // irrelevant. 5056 if (cast<MemberExpr>(E)->isArrow()) 5057 return 0; 5058 // Otherwise, the expression refers to a part of the base 5059 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 5060 case Stmt::ArraySubscriptExprClass: { 5061 // FIXME: This code shouldn't be necessary! We should catch the implicit 5062 // promotion of register arrays earlier. 5063 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 5064 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 5065 if (ICE->getSubExpr()->getType()->isArrayType()) 5066 return getPrimaryDecl(ICE->getSubExpr()); 5067 } 5068 return 0; 5069 } 5070 case Stmt::UnaryOperatorClass: { 5071 UnaryOperator *UO = cast<UnaryOperator>(E); 5072 5073 switch(UO->getOpcode()) { 5074 case UnaryOperator::Real: 5075 case UnaryOperator::Imag: 5076 case UnaryOperator::Extension: 5077 return getPrimaryDecl(UO->getSubExpr()); 5078 default: 5079 return 0; 5080 } 5081 } 5082 case Stmt::ParenExprClass: 5083 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 5084 case Stmt::ImplicitCastExprClass: 5085 // If the result of an implicit cast is an l-value, we care about 5086 // the sub-expression; otherwise, the result here doesn't matter. 5087 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 5088 default: 5089 return 0; 5090 } 5091} 5092 5093/// CheckAddressOfOperand - The operand of & must be either a function 5094/// designator or an lvalue designating an object. If it is an lvalue, the 5095/// object cannot be declared with storage class register or be a bit field. 5096/// Note: The usual conversions are *not* applied to the operand of the & 5097/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 5098/// In C++, the operand might be an overloaded function name, in which case 5099/// we allow the '&' but retain the overloaded-function type. 5100QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 5101 // Make sure to ignore parentheses in subsequent checks 5102 op = op->IgnoreParens(); 5103 5104 if (op->isTypeDependent()) 5105 return Context.DependentTy; 5106 5107 if (getLangOptions().C99) { 5108 // Implement C99-only parts of addressof rules. 5109 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 5110 if (uOp->getOpcode() == UnaryOperator::Deref) 5111 // Per C99 6.5.3.2, the address of a deref always returns a valid result 5112 // (assuming the deref expression is valid). 5113 return uOp->getSubExpr()->getType(); 5114 } 5115 // Technically, there should be a check for array subscript 5116 // expressions here, but the result of one is always an lvalue anyway. 5117 } 5118 NamedDecl *dcl = getPrimaryDecl(op); 5119 Expr::isLvalueResult lval = op->isLvalue(Context); 5120 5121 if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) { 5122 // C99 6.5.3.2p1 5123 // The operand must be either an l-value or a function designator 5124 if (!op->getType()->isFunctionType()) { 5125 // FIXME: emit more specific diag... 5126 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 5127 << op->getSourceRange(); 5128 return QualType(); 5129 } 5130 } else if (op->getBitField()) { // C99 6.5.3.2p1 5131 // The operand cannot be a bit-field 5132 Diag(OpLoc, diag::err_typecheck_address_of) 5133 << "bit-field" << op->getSourceRange(); 5134 return QualType(); 5135 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 5136 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 5137 // The operand cannot be an element of a vector 5138 Diag(OpLoc, diag::err_typecheck_address_of) 5139 << "vector element" << op->getSourceRange(); 5140 return QualType(); 5141 } else if (isa<ObjCPropertyRefExpr>(op)) { 5142 // cannot take address of a property expression. 5143 Diag(OpLoc, diag::err_typecheck_address_of) 5144 << "property expression" << op->getSourceRange(); 5145 return QualType(); 5146 } else if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(op)) { 5147 // FIXME: Can LHS ever be null here? 5148 if (!CheckAddressOfOperand(CO->getTrueExpr(), OpLoc).isNull()) 5149 return CheckAddressOfOperand(CO->getFalseExpr(), OpLoc); 5150 } else if (dcl) { // C99 6.5.3.2p1 5151 // We have an lvalue with a decl. Make sure the decl is not declared 5152 // with the register storage-class specifier. 5153 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 5154 if (vd->getStorageClass() == VarDecl::Register) { 5155 Diag(OpLoc, diag::err_typecheck_address_of) 5156 << "register variable" << op->getSourceRange(); 5157 return QualType(); 5158 } 5159 } else if (isa<OverloadedFunctionDecl>(dcl) || 5160 isa<FunctionTemplateDecl>(dcl)) { 5161 return Context.OverloadTy; 5162 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) { 5163 // Okay: we can take the address of a field. 5164 // Could be a pointer to member, though, if there is an explicit 5165 // scope qualifier for the class. 5166 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) { 5167 DeclContext *Ctx = dcl->getDeclContext(); 5168 if (Ctx && Ctx->isRecord()) { 5169 if (FD->getType()->isReferenceType()) { 5170 Diag(OpLoc, 5171 diag::err_cannot_form_pointer_to_member_of_reference_type) 5172 << FD->getDeclName() << FD->getType(); 5173 return QualType(); 5174 } 5175 5176 return Context.getMemberPointerType(op->getType(), 5177 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 5178 } 5179 } 5180 } else if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(dcl)) { 5181 // Okay: we can take the address of a function. 5182 // As above. 5183 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier() && 5184 MD->isInstance()) 5185 return Context.getMemberPointerType(op->getType(), 5186 Context.getTypeDeclType(MD->getParent()).getTypePtr()); 5187 } else if (!isa<FunctionDecl>(dcl)) 5188 assert(0 && "Unknown/unexpected decl type"); 5189 } 5190 5191 if (lval == Expr::LV_IncompleteVoidType) { 5192 // Taking the address of a void variable is technically illegal, but we 5193 // allow it in cases which are otherwise valid. 5194 // Example: "extern void x; void* y = &x;". 5195 Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange(); 5196 } 5197 5198 // If the operand has type "type", the result has type "pointer to type". 5199 return Context.getPointerType(op->getType()); 5200} 5201 5202QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 5203 if (Op->isTypeDependent()) 5204 return Context.DependentTy; 5205 5206 UsualUnaryConversions(Op); 5207 QualType Ty = Op->getType(); 5208 5209 // Note that per both C89 and C99, this is always legal, even if ptype is an 5210 // incomplete type or void. It would be possible to warn about dereferencing 5211 // a void pointer, but it's completely well-defined, and such a warning is 5212 // unlikely to catch any mistakes. 5213 if (const PointerType *PT = Ty->getAs<PointerType>()) 5214 return PT->getPointeeType(); 5215 5216 if (const ObjCObjectPointerType *OPT = Ty->getAs<ObjCObjectPointerType>()) 5217 return OPT->getPointeeType(); 5218 5219 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 5220 << Ty << Op->getSourceRange(); 5221 return QualType(); 5222} 5223 5224static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 5225 tok::TokenKind Kind) { 5226 BinaryOperator::Opcode Opc; 5227 switch (Kind) { 5228 default: assert(0 && "Unknown binop!"); 5229 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 5230 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 5231 case tok::star: Opc = BinaryOperator::Mul; break; 5232 case tok::slash: Opc = BinaryOperator::Div; break; 5233 case tok::percent: Opc = BinaryOperator::Rem; break; 5234 case tok::plus: Opc = BinaryOperator::Add; break; 5235 case tok::minus: Opc = BinaryOperator::Sub; break; 5236 case tok::lessless: Opc = BinaryOperator::Shl; break; 5237 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 5238 case tok::lessequal: Opc = BinaryOperator::LE; break; 5239 case tok::less: Opc = BinaryOperator::LT; break; 5240 case tok::greaterequal: Opc = BinaryOperator::GE; break; 5241 case tok::greater: Opc = BinaryOperator::GT; break; 5242 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 5243 case tok::equalequal: Opc = BinaryOperator::EQ; break; 5244 case tok::amp: Opc = BinaryOperator::And; break; 5245 case tok::caret: Opc = BinaryOperator::Xor; break; 5246 case tok::pipe: Opc = BinaryOperator::Or; break; 5247 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 5248 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 5249 case tok::equal: Opc = BinaryOperator::Assign; break; 5250 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 5251 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 5252 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 5253 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 5254 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 5255 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 5256 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 5257 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 5258 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 5259 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 5260 case tok::comma: Opc = BinaryOperator::Comma; break; 5261 } 5262 return Opc; 5263} 5264 5265static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 5266 tok::TokenKind Kind) { 5267 UnaryOperator::Opcode Opc; 5268 switch (Kind) { 5269 default: assert(0 && "Unknown unary op!"); 5270 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 5271 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 5272 case tok::amp: Opc = UnaryOperator::AddrOf; break; 5273 case tok::star: Opc = UnaryOperator::Deref; break; 5274 case tok::plus: Opc = UnaryOperator::Plus; break; 5275 case tok::minus: Opc = UnaryOperator::Minus; break; 5276 case tok::tilde: Opc = UnaryOperator::Not; break; 5277 case tok::exclaim: Opc = UnaryOperator::LNot; break; 5278 case tok::kw___real: Opc = UnaryOperator::Real; break; 5279 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 5280 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 5281 } 5282 return Opc; 5283} 5284 5285/// CreateBuiltinBinOp - Creates a new built-in binary operation with 5286/// operator @p Opc at location @c TokLoc. This routine only supports 5287/// built-in operations; ActOnBinOp handles overloaded operators. 5288Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 5289 unsigned Op, 5290 Expr *lhs, Expr *rhs) { 5291 QualType ResultTy; // Result type of the binary operator. 5292 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 5293 // The following two variables are used for compound assignment operators 5294 QualType CompLHSTy; // Type of LHS after promotions for computation 5295 QualType CompResultTy; // Type of computation result 5296 5297 switch (Opc) { 5298 case BinaryOperator::Assign: 5299 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 5300 break; 5301 case BinaryOperator::PtrMemD: 5302 case BinaryOperator::PtrMemI: 5303 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 5304 Opc == BinaryOperator::PtrMemI); 5305 break; 5306 case BinaryOperator::Mul: 5307 case BinaryOperator::Div: 5308 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 5309 break; 5310 case BinaryOperator::Rem: 5311 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 5312 break; 5313 case BinaryOperator::Add: 5314 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 5315 break; 5316 case BinaryOperator::Sub: 5317 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 5318 break; 5319 case BinaryOperator::Shl: 5320 case BinaryOperator::Shr: 5321 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 5322 break; 5323 case BinaryOperator::LE: 5324 case BinaryOperator::LT: 5325 case BinaryOperator::GE: 5326 case BinaryOperator::GT: 5327 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 5328 break; 5329 case BinaryOperator::EQ: 5330 case BinaryOperator::NE: 5331 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 5332 break; 5333 case BinaryOperator::And: 5334 case BinaryOperator::Xor: 5335 case BinaryOperator::Or: 5336 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 5337 break; 5338 case BinaryOperator::LAnd: 5339 case BinaryOperator::LOr: 5340 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 5341 break; 5342 case BinaryOperator::MulAssign: 5343 case BinaryOperator::DivAssign: 5344 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 5345 CompLHSTy = CompResultTy; 5346 if (!CompResultTy.isNull()) 5347 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5348 break; 5349 case BinaryOperator::RemAssign: 5350 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 5351 CompLHSTy = CompResultTy; 5352 if (!CompResultTy.isNull()) 5353 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5354 break; 5355 case BinaryOperator::AddAssign: 5356 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5357 if (!CompResultTy.isNull()) 5358 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5359 break; 5360 case BinaryOperator::SubAssign: 5361 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 5362 if (!CompResultTy.isNull()) 5363 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5364 break; 5365 case BinaryOperator::ShlAssign: 5366 case BinaryOperator::ShrAssign: 5367 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 5368 CompLHSTy = CompResultTy; 5369 if (!CompResultTy.isNull()) 5370 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5371 break; 5372 case BinaryOperator::AndAssign: 5373 case BinaryOperator::XorAssign: 5374 case BinaryOperator::OrAssign: 5375 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 5376 CompLHSTy = CompResultTy; 5377 if (!CompResultTy.isNull()) 5378 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 5379 break; 5380 case BinaryOperator::Comma: 5381 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 5382 break; 5383 } 5384 if (ResultTy.isNull()) 5385 return ExprError(); 5386 if (CompResultTy.isNull()) 5387 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 5388 else 5389 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 5390 CompLHSTy, CompResultTy, 5391 OpLoc)); 5392} 5393 5394/// SuggestParentheses - Emit a diagnostic together with a fixit hint that wraps 5395/// ParenRange in parentheses. 5396static void SuggestParentheses(Sema &Self, SourceLocation Loc, 5397 const PartialDiagnostic &PD, 5398 SourceRange ParenRange) 5399{ 5400 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(ParenRange.getEnd()); 5401 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) { 5402 // We can't display the parentheses, so just dig the 5403 // warning/error and return. 5404 Self.Diag(Loc, PD); 5405 return; 5406 } 5407 5408 Self.Diag(Loc, PD) 5409 << CodeModificationHint::CreateInsertion(ParenRange.getBegin(), "(") 5410 << CodeModificationHint::CreateInsertion(EndLoc, ")"); 5411} 5412 5413/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison 5414/// operators are mixed in a way that suggests that the programmer forgot that 5415/// comparison operators have higher precedence. The most typical example of 5416/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1". 5417static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperator::Opcode Opc, 5418 SourceLocation OpLoc,Expr *lhs,Expr *rhs){ 5419 typedef BinaryOperator BinOp; 5420 BinOp::Opcode lhsopc = static_cast<BinOp::Opcode>(-1), 5421 rhsopc = static_cast<BinOp::Opcode>(-1); 5422 if (BinOp *BO = dyn_cast<BinOp>(lhs)) 5423 lhsopc = BO->getOpcode(); 5424 if (BinOp *BO = dyn_cast<BinOp>(rhs)) 5425 rhsopc = BO->getOpcode(); 5426 5427 // Subs are not binary operators. 5428 if (lhsopc == -1 && rhsopc == -1) 5429 return; 5430 5431 // Bitwise operations are sometimes used as eager logical ops. 5432 // Don't diagnose this. 5433 if ((BinOp::isComparisonOp(lhsopc) || BinOp::isBitwiseOp(lhsopc)) && 5434 (BinOp::isComparisonOp(rhsopc) || BinOp::isBitwiseOp(rhsopc))) 5435 return; 5436 5437 if (BinOp::isComparisonOp(lhsopc)) 5438 SuggestParentheses(Self, OpLoc, 5439 PDiag(diag::warn_precedence_bitwise_rel) 5440 << SourceRange(lhs->getLocStart(), OpLoc) 5441 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(lhsopc), 5442 SourceRange(cast<BinOp>(lhs)->getRHS()->getLocStart(), rhs->getLocEnd())); 5443 else if (BinOp::isComparisonOp(rhsopc)) 5444 SuggestParentheses(Self, OpLoc, 5445 PDiag(diag::warn_precedence_bitwise_rel) 5446 << SourceRange(OpLoc, rhs->getLocEnd()) 5447 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(rhsopc), 5448 SourceRange(lhs->getLocEnd(), cast<BinOp>(rhs)->getLHS()->getLocStart())); 5449} 5450 5451/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky 5452/// precedence. This currently diagnoses only "arg1 'bitwise' arg2 'eq' arg3". 5453/// But it could also warn about arg1 && arg2 || arg3, as GCC 4.3+ does. 5454static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperator::Opcode Opc, 5455 SourceLocation OpLoc, Expr *lhs, Expr *rhs){ 5456 if (BinaryOperator::isBitwiseOp(Opc)) 5457 DiagnoseBitwisePrecedence(Self, Opc, OpLoc, lhs, rhs); 5458} 5459 5460// Binary Operators. 'Tok' is the token for the operator. 5461Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 5462 tok::TokenKind Kind, 5463 ExprArg LHS, ExprArg RHS) { 5464 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 5465 Expr *lhs = LHS.takeAs<Expr>(), *rhs = RHS.takeAs<Expr>(); 5466 5467 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 5468 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 5469 5470 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0" 5471 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, lhs, rhs); 5472 5473 if (getLangOptions().CPlusPlus && 5474 (lhs->getType()->isOverloadableType() || 5475 rhs->getType()->isOverloadableType())) { 5476 // Find all of the overloaded operators visible from this 5477 // point. We perform both an operator-name lookup from the local 5478 // scope and an argument-dependent lookup based on the types of 5479 // the arguments. 5480 FunctionSet Functions; 5481 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 5482 if (OverOp != OO_None) { 5483 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 5484 Functions); 5485 Expr *Args[2] = { lhs, rhs }; 5486 DeclarationName OpName 5487 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5488 ArgumentDependentLookup(OpName, /*Operator*/true, Args, 2, Functions); 5489 } 5490 5491 // Build the (potentially-overloaded, potentially-dependent) 5492 // binary operation. 5493 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 5494 } 5495 5496 // Build a built-in binary operation. 5497 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 5498} 5499 5500Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 5501 unsigned OpcIn, 5502 ExprArg InputArg) { 5503 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 5504 5505 // FIXME: Input is modified below, but InputArg is not updated appropriately. 5506 Expr *Input = (Expr *)InputArg.get(); 5507 QualType resultType; 5508 switch (Opc) { 5509 case UnaryOperator::OffsetOf: 5510 assert(false && "Invalid unary operator"); 5511 break; 5512 5513 case UnaryOperator::PreInc: 5514 case UnaryOperator::PreDec: 5515 case UnaryOperator::PostInc: 5516 case UnaryOperator::PostDec: 5517 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 5518 Opc == UnaryOperator::PreInc || 5519 Opc == UnaryOperator::PostInc); 5520 break; 5521 case UnaryOperator::AddrOf: 5522 resultType = CheckAddressOfOperand(Input, OpLoc); 5523 break; 5524 case UnaryOperator::Deref: 5525 DefaultFunctionArrayConversion(Input); 5526 resultType = CheckIndirectionOperand(Input, OpLoc); 5527 break; 5528 case UnaryOperator::Plus: 5529 case UnaryOperator::Minus: 5530 UsualUnaryConversions(Input); 5531 resultType = Input->getType(); 5532 if (resultType->isDependentType()) 5533 break; 5534 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 5535 break; 5536 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 5537 resultType->isEnumeralType()) 5538 break; 5539 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 5540 Opc == UnaryOperator::Plus && 5541 resultType->isPointerType()) 5542 break; 5543 5544 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5545 << resultType << Input->getSourceRange()); 5546 case UnaryOperator::Not: // bitwise complement 5547 UsualUnaryConversions(Input); 5548 resultType = Input->getType(); 5549 if (resultType->isDependentType()) 5550 break; 5551 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 5552 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 5553 // C99 does not support '~' for complex conjugation. 5554 Diag(OpLoc, diag::ext_integer_complement_complex) 5555 << resultType << Input->getSourceRange(); 5556 else if (!resultType->isIntegerType()) 5557 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5558 << resultType << Input->getSourceRange()); 5559 break; 5560 case UnaryOperator::LNot: // logical negation 5561 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 5562 DefaultFunctionArrayConversion(Input); 5563 resultType = Input->getType(); 5564 if (resultType->isDependentType()) 5565 break; 5566 if (!resultType->isScalarType()) // C99 6.5.3.3p1 5567 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 5568 << resultType << Input->getSourceRange()); 5569 // LNot always has type int. C99 6.5.3.3p5. 5570 // In C++, it's bool. C++ 5.3.1p8 5571 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 5572 break; 5573 case UnaryOperator::Real: 5574 case UnaryOperator::Imag: 5575 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 5576 break; 5577 case UnaryOperator::Extension: 5578 resultType = Input->getType(); 5579 break; 5580 } 5581 if (resultType.isNull()) 5582 return ExprError(); 5583 5584 InputArg.release(); 5585 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 5586} 5587 5588// Unary Operators. 'Tok' is the token for the operator. 5589Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 5590 tok::TokenKind Op, ExprArg input) { 5591 Expr *Input = (Expr*)input.get(); 5592 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 5593 5594 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 5595 // Find all of the overloaded operators visible from this 5596 // point. We perform both an operator-name lookup from the local 5597 // scope and an argument-dependent lookup based on the types of 5598 // the arguments. 5599 FunctionSet Functions; 5600 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 5601 if (OverOp != OO_None) { 5602 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 5603 Functions); 5604 DeclarationName OpName 5605 = Context.DeclarationNames.getCXXOperatorName(OverOp); 5606 ArgumentDependentLookup(OpName, /*Operator*/true, &Input, 1, Functions); 5607 } 5608 5609 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 5610 } 5611 5612 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 5613} 5614 5615/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 5616Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 5617 SourceLocation LabLoc, 5618 IdentifierInfo *LabelII) { 5619 // Look up the record for this label identifier. 5620 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 5621 5622 // If we haven't seen this label yet, create a forward reference. It 5623 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 5624 if (LabelDecl == 0) 5625 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 5626 5627 // Create the AST node. The address of a label always has type 'void*'. 5628 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 5629 Context.getPointerType(Context.VoidTy))); 5630} 5631 5632Sema::OwningExprResult 5633Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 5634 SourceLocation RPLoc) { // "({..})" 5635 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 5636 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 5637 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 5638 5639 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 5640 if (isFileScope) 5641 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 5642 5643 // FIXME: there are a variety of strange constraints to enforce here, for 5644 // example, it is not possible to goto into a stmt expression apparently. 5645 // More semantic analysis is needed. 5646 5647 // If there are sub stmts in the compound stmt, take the type of the last one 5648 // as the type of the stmtexpr. 5649 QualType Ty = Context.VoidTy; 5650 5651 if (!Compound->body_empty()) { 5652 Stmt *LastStmt = Compound->body_back(); 5653 // If LastStmt is a label, skip down through into the body. 5654 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 5655 LastStmt = Label->getSubStmt(); 5656 5657 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 5658 Ty = LastExpr->getType(); 5659 } 5660 5661 // FIXME: Check that expression type is complete/non-abstract; statement 5662 // expressions are not lvalues. 5663 5664 substmt.release(); 5665 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 5666} 5667 5668Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 5669 SourceLocation BuiltinLoc, 5670 SourceLocation TypeLoc, 5671 TypeTy *argty, 5672 OffsetOfComponent *CompPtr, 5673 unsigned NumComponents, 5674 SourceLocation RPLoc) { 5675 // FIXME: This function leaks all expressions in the offset components on 5676 // error. 5677 // FIXME: Preserve type source info. 5678 QualType ArgTy = GetTypeFromParser(argty); 5679 assert(!ArgTy.isNull() && "Missing type argument!"); 5680 5681 bool Dependent = ArgTy->isDependentType(); 5682 5683 // We must have at least one component that refers to the type, and the first 5684 // one is known to be a field designator. Verify that the ArgTy represents 5685 // a struct/union/class. 5686 if (!Dependent && !ArgTy->isRecordType()) 5687 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 5688 5689 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 5690 // with an incomplete type would be illegal. 5691 5692 // Otherwise, create a null pointer as the base, and iteratively process 5693 // the offsetof designators. 5694 QualType ArgTyPtr = Context.getPointerType(ArgTy); 5695 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 5696 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 5697 ArgTy, SourceLocation()); 5698 5699 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 5700 // GCC extension, diagnose them. 5701 // FIXME: This diagnostic isn't actually visible because the location is in 5702 // a system header! 5703 if (NumComponents != 1) 5704 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 5705 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 5706 5707 if (!Dependent) { 5708 bool DidWarnAboutNonPOD = false; 5709 5710 if (RequireCompleteType(TypeLoc, Res->getType(), 5711 diag::err_offsetof_incomplete_type)) 5712 return ExprError(); 5713 5714 // FIXME: Dependent case loses a lot of information here. And probably 5715 // leaks like a sieve. 5716 for (unsigned i = 0; i != NumComponents; ++i) { 5717 const OffsetOfComponent &OC = CompPtr[i]; 5718 if (OC.isBrackets) { 5719 // Offset of an array sub-field. TODO: Should we allow vector elements? 5720 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 5721 if (!AT) { 5722 Res->Destroy(Context); 5723 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 5724 << Res->getType()); 5725 } 5726 5727 // FIXME: C++: Verify that operator[] isn't overloaded. 5728 5729 // Promote the array so it looks more like a normal array subscript 5730 // expression. 5731 DefaultFunctionArrayConversion(Res); 5732 5733 // C99 6.5.2.1p1 5734 Expr *Idx = static_cast<Expr*>(OC.U.E); 5735 // FIXME: Leaks Res 5736 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 5737 return ExprError(Diag(Idx->getLocStart(), 5738 diag::err_typecheck_subscript_not_integer) 5739 << Idx->getSourceRange()); 5740 5741 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 5742 OC.LocEnd); 5743 continue; 5744 } 5745 5746 const RecordType *RC = Res->getType()->getAs<RecordType>(); 5747 if (!RC) { 5748 Res->Destroy(Context); 5749 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 5750 << Res->getType()); 5751 } 5752 5753 // Get the decl corresponding to this. 5754 RecordDecl *RD = RC->getDecl(); 5755 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 5756 if (!CRD->isPOD() && !DidWarnAboutNonPOD) { 5757 ExprError(Diag(BuiltinLoc, diag::warn_offsetof_non_pod_type) 5758 << SourceRange(CompPtr[0].LocStart, OC.LocEnd) 5759 << Res->getType()); 5760 DidWarnAboutNonPOD = true; 5761 } 5762 } 5763 5764 LookupResult R; 5765 LookupQualifiedName(R, RD, OC.U.IdentInfo, LookupMemberName); 5766 5767 FieldDecl *MemberDecl 5768 = dyn_cast_or_null<FieldDecl>(R.getAsSingleDecl(Context)); 5769 // FIXME: Leaks Res 5770 if (!MemberDecl) 5771 return ExprError(Diag(BuiltinLoc, diag::err_no_member) 5772 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart, OC.LocEnd)); 5773 5774 // FIXME: C++: Verify that MemberDecl isn't a static field. 5775 // FIXME: Verify that MemberDecl isn't a bitfield. 5776 if (cast<RecordDecl>(MemberDecl->getDeclContext())->isAnonymousStructOrUnion()) { 5777 Res = BuildAnonymousStructUnionMemberReference( 5778 SourceLocation(), MemberDecl, Res, SourceLocation()).takeAs<Expr>(); 5779 } else { 5780 // MemberDecl->getType() doesn't get the right qualifiers, but it 5781 // doesn't matter here. 5782 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 5783 MemberDecl->getType().getNonReferenceType()); 5784 } 5785 } 5786 } 5787 5788 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 5789 Context.getSizeType(), BuiltinLoc)); 5790} 5791 5792 5793Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 5794 TypeTy *arg1,TypeTy *arg2, 5795 SourceLocation RPLoc) { 5796 // FIXME: Preserve type source info. 5797 QualType argT1 = GetTypeFromParser(arg1); 5798 QualType argT2 = GetTypeFromParser(arg2); 5799 5800 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 5801 5802 if (getLangOptions().CPlusPlus) { 5803 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus) 5804 << SourceRange(BuiltinLoc, RPLoc); 5805 return ExprError(); 5806 } 5807 5808 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 5809 argT1, argT2, RPLoc)); 5810} 5811 5812Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 5813 ExprArg cond, 5814 ExprArg expr1, ExprArg expr2, 5815 SourceLocation RPLoc) { 5816 Expr *CondExpr = static_cast<Expr*>(cond.get()); 5817 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 5818 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 5819 5820 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 5821 5822 QualType resType; 5823 bool ValueDependent = false; 5824 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) { 5825 resType = Context.DependentTy; 5826 ValueDependent = true; 5827 } else { 5828 // The conditional expression is required to be a constant expression. 5829 llvm::APSInt condEval(32); 5830 SourceLocation ExpLoc; 5831 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 5832 return ExprError(Diag(ExpLoc, 5833 diag::err_typecheck_choose_expr_requires_constant) 5834 << CondExpr->getSourceRange()); 5835 5836 // If the condition is > zero, then the AST type is the same as the LSHExpr. 5837 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 5838 ValueDependent = condEval.getZExtValue() ? LHSExpr->isValueDependent() 5839 : RHSExpr->isValueDependent(); 5840 } 5841 5842 cond.release(); expr1.release(); expr2.release(); 5843 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 5844 resType, RPLoc, 5845 resType->isDependentType(), 5846 ValueDependent)); 5847} 5848 5849//===----------------------------------------------------------------------===// 5850// Clang Extensions. 5851//===----------------------------------------------------------------------===// 5852 5853/// ActOnBlockStart - This callback is invoked when a block literal is started. 5854void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 5855 // Analyze block parameters. 5856 BlockSemaInfo *BSI = new BlockSemaInfo(); 5857 5858 // Add BSI to CurBlock. 5859 BSI->PrevBlockInfo = CurBlock; 5860 CurBlock = BSI; 5861 5862 BSI->ReturnType = QualType(); 5863 BSI->TheScope = BlockScope; 5864 BSI->hasBlockDeclRefExprs = false; 5865 BSI->hasPrototype = false; 5866 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 5867 CurFunctionNeedsScopeChecking = false; 5868 5869 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 5870 PushDeclContext(BlockScope, BSI->TheDecl); 5871} 5872 5873void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 5874 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!"); 5875 5876 if (ParamInfo.getNumTypeObjects() == 0 5877 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 5878 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5879 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5880 5881 if (T->isArrayType()) { 5882 Diag(ParamInfo.getSourceRange().getBegin(), 5883 diag::err_block_returns_array); 5884 return; 5885 } 5886 5887 // The parameter list is optional, if there was none, assume (). 5888 if (!T->isFunctionType()) 5889 T = Context.getFunctionType(T, NULL, 0, 0, 0); 5890 5891 CurBlock->hasPrototype = true; 5892 CurBlock->isVariadic = false; 5893 // Check for a valid sentinel attribute on this block. 5894 if (CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5895 Diag(ParamInfo.getAttributes()->getLoc(), 5896 diag::warn_attribute_sentinel_not_variadic) << 1; 5897 // FIXME: remove the attribute. 5898 } 5899 QualType RetTy = T.getTypePtr()->getAs<FunctionType>()->getResultType(); 5900 5901 // Do not allow returning a objc interface by-value. 5902 if (RetTy->isObjCInterfaceType()) { 5903 Diag(ParamInfo.getSourceRange().getBegin(), 5904 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5905 return; 5906 } 5907 return; 5908 } 5909 5910 // Analyze arguments to block. 5911 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 5912 "Not a function declarator!"); 5913 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 5914 5915 CurBlock->hasPrototype = FTI.hasPrototype; 5916 CurBlock->isVariadic = true; 5917 5918 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 5919 // no arguments, not a function that takes a single void argument. 5920 if (FTI.hasPrototype && 5921 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5922 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 5923 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 5924 // empty arg list, don't push any params. 5925 CurBlock->isVariadic = false; 5926 } else if (FTI.hasPrototype) { 5927 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 5928 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 5929 CurBlock->isVariadic = FTI.isVariadic; 5930 } 5931 CurBlock->TheDecl->setParams(Context, CurBlock->Params.data(), 5932 CurBlock->Params.size()); 5933 CurBlock->TheDecl->setIsVariadic(CurBlock->isVariadic); 5934 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo); 5935 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 5936 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 5937 // If this has an identifier, add it to the scope stack. 5938 if ((*AI)->getIdentifier()) 5939 PushOnScopeChains(*AI, CurBlock->TheScope); 5940 5941 // Check for a valid sentinel attribute on this block. 5942 if (!CurBlock->isVariadic && 5943 CurBlock->TheDecl->getAttr<SentinelAttr>()) { 5944 Diag(ParamInfo.getAttributes()->getLoc(), 5945 diag::warn_attribute_sentinel_not_variadic) << 1; 5946 // FIXME: remove the attribute. 5947 } 5948 5949 // Analyze the return type. 5950 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 5951 QualType RetTy = T->getAs<FunctionType>()->getResultType(); 5952 5953 // Do not allow returning a objc interface by-value. 5954 if (RetTy->isObjCInterfaceType()) { 5955 Diag(ParamInfo.getSourceRange().getBegin(), 5956 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 5957 } else if (!RetTy->isDependentType()) 5958 CurBlock->ReturnType = RetTy; 5959} 5960 5961/// ActOnBlockError - If there is an error parsing a block, this callback 5962/// is invoked to pop the information about the block from the action impl. 5963void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 5964 // Ensure that CurBlock is deleted. 5965 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 5966 5967 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 5968 5969 // Pop off CurBlock, handle nested blocks. 5970 PopDeclContext(); 5971 CurBlock = CurBlock->PrevBlockInfo; 5972 // FIXME: Delete the ParmVarDecl objects as well??? 5973} 5974 5975/// ActOnBlockStmtExpr - This is called when the body of a block statement 5976/// literal was successfully completed. ^(int x){...} 5977Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 5978 StmtArg body, Scope *CurScope) { 5979 // If blocks are disabled, emit an error. 5980 if (!LangOpts.Blocks) 5981 Diag(CaretLoc, diag::err_blocks_disable); 5982 5983 // Ensure that CurBlock is deleted. 5984 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 5985 5986 PopDeclContext(); 5987 5988 // Pop off CurBlock, handle nested blocks. 5989 CurBlock = CurBlock->PrevBlockInfo; 5990 5991 QualType RetTy = Context.VoidTy; 5992 if (!BSI->ReturnType.isNull()) 5993 RetTy = BSI->ReturnType; 5994 5995 llvm::SmallVector<QualType, 8> ArgTypes; 5996 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 5997 ArgTypes.push_back(BSI->Params[i]->getType()); 5998 5999 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>(); 6000 QualType BlockTy; 6001 if (!BSI->hasPrototype) 6002 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0, false, false, 0, 0, 6003 NoReturn); 6004 else 6005 BlockTy = Context.getFunctionType(RetTy, ArgTypes.data(), ArgTypes.size(), 6006 BSI->isVariadic, 0, false, false, 0, 0, 6007 NoReturn); 6008 6009 // FIXME: Check that return/parameter types are complete/non-abstract 6010 DiagnoseUnusedParameters(BSI->Params.begin(), BSI->Params.end()); 6011 BlockTy = Context.getBlockPointerType(BlockTy); 6012 6013 // If needed, diagnose invalid gotos and switches in the block. 6014 if (CurFunctionNeedsScopeChecking) 6015 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 6016 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 6017 6018 BSI->TheDecl->setBody(body.takeAs<CompoundStmt>()); 6019 CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody()); 6020 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 6021 BSI->hasBlockDeclRefExprs)); 6022} 6023 6024Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 6025 ExprArg expr, TypeTy *type, 6026 SourceLocation RPLoc) { 6027 QualType T = GetTypeFromParser(type); 6028 Expr *E = static_cast<Expr*>(expr.get()); 6029 Expr *OrigExpr = E; 6030 6031 InitBuiltinVaListType(); 6032 6033 // Get the va_list type 6034 QualType VaListType = Context.getBuiltinVaListType(); 6035 if (VaListType->isArrayType()) { 6036 // Deal with implicit array decay; for example, on x86-64, 6037 // va_list is an array, but it's supposed to decay to 6038 // a pointer for va_arg. 6039 VaListType = Context.getArrayDecayedType(VaListType); 6040 // Make sure the input expression also decays appropriately. 6041 UsualUnaryConversions(E); 6042 } else { 6043 // Otherwise, the va_list argument must be an l-value because 6044 // it is modified by va_arg. 6045 if (!E->isTypeDependent() && 6046 CheckForModifiableLvalue(E, BuiltinLoc, *this)) 6047 return ExprError(); 6048 } 6049 6050 if (!E->isTypeDependent() && 6051 !Context.hasSameType(VaListType, E->getType())) { 6052 return ExprError(Diag(E->getLocStart(), 6053 diag::err_first_argument_to_va_arg_not_of_type_va_list) 6054 << OrigExpr->getType() << E->getSourceRange()); 6055 } 6056 6057 // FIXME: Check that type is complete/non-abstract 6058 // FIXME: Warn if a non-POD type is passed in. 6059 6060 expr.release(); 6061 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 6062 RPLoc)); 6063} 6064 6065Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 6066 // The type of __null will be int or long, depending on the size of 6067 // pointers on the target. 6068 QualType Ty; 6069 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 6070 Ty = Context.IntTy; 6071 else 6072 Ty = Context.LongTy; 6073 6074 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 6075} 6076 6077bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 6078 SourceLocation Loc, 6079 QualType DstType, QualType SrcType, 6080 Expr *SrcExpr, const char *Flavor) { 6081 // Decode the result (notice that AST's are still created for extensions). 6082 bool isInvalid = false; 6083 unsigned DiagKind; 6084 switch (ConvTy) { 6085 default: assert(0 && "Unknown conversion type"); 6086 case Compatible: return false; 6087 case PointerToInt: 6088 DiagKind = diag::ext_typecheck_convert_pointer_int; 6089 break; 6090 case IntToPointer: 6091 DiagKind = diag::ext_typecheck_convert_int_pointer; 6092 break; 6093 case IncompatiblePointer: 6094 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 6095 break; 6096 case IncompatiblePointerSign: 6097 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 6098 break; 6099 case FunctionVoidPointer: 6100 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 6101 break; 6102 case CompatiblePointerDiscardsQualifiers: 6103 // If the qualifiers lost were because we were applying the 6104 // (deprecated) C++ conversion from a string literal to a char* 6105 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 6106 // Ideally, this check would be performed in 6107 // CheckPointerTypesForAssignment. However, that would require a 6108 // bit of refactoring (so that the second argument is an 6109 // expression, rather than a type), which should be done as part 6110 // of a larger effort to fix CheckPointerTypesForAssignment for 6111 // C++ semantics. 6112 if (getLangOptions().CPlusPlus && 6113 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 6114 return false; 6115 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 6116 break; 6117 case IntToBlockPointer: 6118 DiagKind = diag::err_int_to_block_pointer; 6119 break; 6120 case IncompatibleBlockPointer: 6121 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 6122 break; 6123 case IncompatibleObjCQualifiedId: 6124 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 6125 // it can give a more specific diagnostic. 6126 DiagKind = diag::warn_incompatible_qualified_id; 6127 break; 6128 case IncompatibleVectors: 6129 DiagKind = diag::warn_incompatible_vectors; 6130 break; 6131 case Incompatible: 6132 DiagKind = diag::err_typecheck_convert_incompatible; 6133 isInvalid = true; 6134 break; 6135 } 6136 6137 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 6138 << SrcExpr->getSourceRange(); 6139 return isInvalid; 6140} 6141 6142bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){ 6143 llvm::APSInt ICEResult; 6144 if (E->isIntegerConstantExpr(ICEResult, Context)) { 6145 if (Result) 6146 *Result = ICEResult; 6147 return false; 6148 } 6149 6150 Expr::EvalResult EvalResult; 6151 6152 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 6153 EvalResult.HasSideEffects) { 6154 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 6155 6156 if (EvalResult.Diag) { 6157 // We only show the note if it's not the usual "invalid subexpression" 6158 // or if it's actually in a subexpression. 6159 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 6160 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 6161 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6162 } 6163 6164 return true; 6165 } 6166 6167 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 6168 E->getSourceRange(); 6169 6170 if (EvalResult.Diag && 6171 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 6172 Diag(EvalResult.DiagLoc, EvalResult.Diag); 6173 6174 if (Result) 6175 *Result = EvalResult.Val.getInt(); 6176 return false; 6177} 6178 6179Sema::ExpressionEvaluationContext 6180Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) { 6181 // Introduce a new set of potentially referenced declarations to the stack. 6182 if (NewContext == PotentiallyPotentiallyEvaluated) 6183 PotentiallyReferencedDeclStack.push_back(PotentiallyReferencedDecls()); 6184 6185 std::swap(ExprEvalContext, NewContext); 6186 return NewContext; 6187} 6188 6189void 6190Sema::PopExpressionEvaluationContext(ExpressionEvaluationContext OldContext, 6191 ExpressionEvaluationContext NewContext) { 6192 ExprEvalContext = NewContext; 6193 6194 if (OldContext == PotentiallyPotentiallyEvaluated) { 6195 // Mark any remaining declarations in the current position of the stack 6196 // as "referenced". If they were not meant to be referenced, semantic 6197 // analysis would have eliminated them (e.g., in ActOnCXXTypeId). 6198 PotentiallyReferencedDecls RemainingDecls; 6199 RemainingDecls.swap(PotentiallyReferencedDeclStack.back()); 6200 PotentiallyReferencedDeclStack.pop_back(); 6201 6202 for (PotentiallyReferencedDecls::iterator I = RemainingDecls.begin(), 6203 IEnd = RemainingDecls.end(); 6204 I != IEnd; ++I) 6205 MarkDeclarationReferenced(I->first, I->second); 6206 } 6207} 6208 6209/// \brief Note that the given declaration was referenced in the source code. 6210/// 6211/// This routine should be invoke whenever a given declaration is referenced 6212/// in the source code, and where that reference occurred. If this declaration 6213/// reference means that the the declaration is used (C++ [basic.def.odr]p2, 6214/// C99 6.9p3), then the declaration will be marked as used. 6215/// 6216/// \param Loc the location where the declaration was referenced. 6217/// 6218/// \param D the declaration that has been referenced by the source code. 6219void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) { 6220 assert(D && "No declaration?"); 6221 6222 if (D->isUsed()) 6223 return; 6224 6225 // Mark a parameter or variable declaration "used", regardless of whether we're in a 6226 // template or not. The reason for this is that unevaluated expressions 6227 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and 6228 // -Wunused-parameters) 6229 if (isa<ParmVarDecl>(D) || 6230 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) 6231 D->setUsed(true); 6232 6233 // Do not mark anything as "used" within a dependent context; wait for 6234 // an instantiation. 6235 if (CurContext->isDependentContext()) 6236 return; 6237 6238 switch (ExprEvalContext) { 6239 case Unevaluated: 6240 // We are in an expression that is not potentially evaluated; do nothing. 6241 return; 6242 6243 case PotentiallyEvaluated: 6244 // We are in a potentially-evaluated expression, so this declaration is 6245 // "used"; handle this below. 6246 break; 6247 6248 case PotentiallyPotentiallyEvaluated: 6249 // We are in an expression that may be potentially evaluated; queue this 6250 // declaration reference until we know whether the expression is 6251 // potentially evaluated. 6252 PotentiallyReferencedDeclStack.back().push_back(std::make_pair(Loc, D)); 6253 return; 6254 } 6255 6256 // Note that this declaration has been used. 6257 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 6258 unsigned TypeQuals; 6259 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) { 6260 if (!Constructor->isUsed()) 6261 DefineImplicitDefaultConstructor(Loc, Constructor); 6262 } else if (Constructor->isImplicit() && 6263 Constructor->isCopyConstructor(Context, TypeQuals)) { 6264 if (!Constructor->isUsed()) 6265 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals); 6266 } 6267 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 6268 if (Destructor->isImplicit() && !Destructor->isUsed()) 6269 DefineImplicitDestructor(Loc, Destructor); 6270 6271 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) { 6272 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 6273 MethodDecl->getOverloadedOperator() == OO_Equal) { 6274 if (!MethodDecl->isUsed()) 6275 DefineImplicitOverloadedAssign(Loc, MethodDecl); 6276 } 6277 } 6278 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 6279 // Implicit instantiation of function templates and member functions of 6280 // class templates. 6281 if (!Function->getBody() && Function->isImplicitlyInstantiable()) { 6282 bool AlreadyInstantiated = false; 6283 if (FunctionTemplateSpecializationInfo *SpecInfo 6284 = Function->getTemplateSpecializationInfo()) { 6285 if (SpecInfo->getPointOfInstantiation().isInvalid()) 6286 SpecInfo->setPointOfInstantiation(Loc); 6287 else if (SpecInfo->getTemplateSpecializationKind() 6288 == TSK_ImplicitInstantiation) 6289 AlreadyInstantiated = true; 6290 } else if (MemberSpecializationInfo *MSInfo 6291 = Function->getMemberSpecializationInfo()) { 6292 if (MSInfo->getPointOfInstantiation().isInvalid()) 6293 MSInfo->setPointOfInstantiation(Loc); 6294 else if (MSInfo->getTemplateSpecializationKind() 6295 == TSK_ImplicitInstantiation) 6296 AlreadyInstantiated = true; 6297 } 6298 6299 if (!AlreadyInstantiated) 6300 PendingImplicitInstantiations.push_back(std::make_pair(Function, Loc)); 6301 } 6302 6303 // FIXME: keep track of references to static functions 6304 Function->setUsed(true); 6305 return; 6306 } 6307 6308 if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 6309 // Implicit instantiation of static data members of class templates. 6310 if (Var->isStaticDataMember() && 6311 Var->getInstantiatedFromStaticDataMember()) { 6312 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 6313 assert(MSInfo && "Missing member specialization information?"); 6314 if (MSInfo->getPointOfInstantiation().isInvalid() && 6315 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) { 6316 MSInfo->setPointOfInstantiation(Loc); 6317 PendingImplicitInstantiations.push_back(std::make_pair(Var, Loc)); 6318 } 6319 } 6320 6321 // FIXME: keep track of references to static data? 6322 6323 D->setUsed(true); 6324 return; 6325 } 6326} 6327 6328bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc, 6329 CallExpr *CE, FunctionDecl *FD) { 6330 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType()) 6331 return false; 6332 6333 PartialDiagnostic Note = 6334 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here) 6335 << FD->getDeclName() : PDiag(); 6336 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation(); 6337 6338 if (RequireCompleteType(Loc, ReturnType, 6339 FD ? 6340 PDiag(diag::err_call_function_incomplete_return) 6341 << CE->getSourceRange() << FD->getDeclName() : 6342 PDiag(diag::err_call_incomplete_return) 6343 << CE->getSourceRange(), 6344 std::make_pair(NoteLoc, Note))) 6345 return true; 6346 6347 return false; 6348} 6349 6350// Diagnose the common s/=/==/ typo. Note that adding parentheses 6351// will prevent this condition from triggering, which is what we want. 6352void Sema::DiagnoseAssignmentAsCondition(Expr *E) { 6353 SourceLocation Loc; 6354 6355 if (isa<BinaryOperator>(E)) { 6356 BinaryOperator *Op = cast<BinaryOperator>(E); 6357 if (Op->getOpcode() != BinaryOperator::Assign) 6358 return; 6359 6360 Loc = Op->getOperatorLoc(); 6361 } else if (isa<CXXOperatorCallExpr>(E)) { 6362 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E); 6363 if (Op->getOperator() != OO_Equal) 6364 return; 6365 6366 Loc = Op->getOperatorLoc(); 6367 } else { 6368 // Not an assignment. 6369 return; 6370 } 6371 6372 SourceLocation Open = E->getSourceRange().getBegin(); 6373 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd()); 6374 6375 Diag(Loc, diag::warn_condition_is_assignment) 6376 << E->getSourceRange() 6377 << CodeModificationHint::CreateInsertion(Open, "(") 6378 << CodeModificationHint::CreateInsertion(Close, ")"); 6379} 6380 6381bool Sema::CheckBooleanCondition(Expr *&E, SourceLocation Loc) { 6382 DiagnoseAssignmentAsCondition(E); 6383 6384 if (!E->isTypeDependent()) { 6385 DefaultFunctionArrayConversion(E); 6386 6387 QualType T = E->getType(); 6388 6389 if (getLangOptions().CPlusPlus) { 6390 if (CheckCXXBooleanCondition(E)) // C++ 6.4p4 6391 return true; 6392 } else if (!T->isScalarType()) { // C99 6.8.4.1p1 6393 Diag(Loc, diag::err_typecheck_statement_requires_scalar) 6394 << T << E->getSourceRange(); 6395 return true; 6396 } 6397 } 6398 6399 return false; 6400} 6401